diff --git a/src/python/loxi/generic_util.py b/src/python/loxi/generic_util.py
index aa218a2..7f3ac46 100644
--- a/src/python/loxi/generic_util.py
+++ b/src/python/loxi/generic_util.py
@@ -82,7 +82,7 @@
         self.offset += length
 
     def skip_align(self):
-        new_offset = ((self.start + self.offset + 7) / 8 * 8) - self.start
+        new_offset = (self.offset + 7) / 8 * 8
         if new_offset > self.length:
             raise loxi.ProtocolError("Buffer too short")
         self.offset = new_offset
@@ -91,9 +91,10 @@
         return self.offset == self.length
 
     # Used when parsing objects that have their own length fields
-    def slice(self, length):
-        if self.offset + length > self.length:
+    def slice(self, length, rewind=0):
+        if self.offset + length - rewind > self.length:
             raise loxi.ProtocolError("Buffer too short")
-        reader = OFReader(self.buf, self.start + self.offset, length)
-        self.offset += length
+        reader = OFReader(self.buf, self.start + self.offset - rewind, length)
+        reader.skip(rewind)
+        self.offset += length - rewind
         return reader
diff --git a/src/python/loxi/of10/action.py b/src/python/loxi/of10/action.py
index e2cf539..08d5cfb 100644
--- a/src/python/loxi/of10/action.py
+++ b/src/python/loxi/of10/action.py
@@ -46,7 +46,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -102,7 +102,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -161,7 +161,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -213,7 +213,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -279,7 +279,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -345,7 +345,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -402,7 +402,7 @@
         assert(_type == 11)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.port = util.unpack_port_no(reader)
         reader.skip(6)
         obj.queue_id = reader.read("!L")[0]
@@ -466,7 +466,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         obj.subtype = reader.read("!H")[0]
@@ -516,7 +516,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         _subtype = reader.read("!H")[0]
@@ -570,7 +570,7 @@
         assert(_type == 0)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.port = util.unpack_port_no(reader)
         obj.max_len = reader.read("!H")[0]
         return obj
@@ -623,7 +623,7 @@
         assert(_type == 5)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.dl_addr = list(reader.read('!6B'))
         reader.skip(6)
         return obj
@@ -672,7 +672,7 @@
         assert(_type == 4)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.dl_addr = list(reader.read('!6B'))
         reader.skip(6)
         return obj
@@ -720,7 +720,7 @@
         assert(_type == 7)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_addr = reader.read("!L")[0]
         return obj
 
@@ -767,7 +767,7 @@
         assert(_type == 6)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_addr = reader.read("!L")[0]
         return obj
 
@@ -815,7 +815,7 @@
         assert(_type == 8)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_tos = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -864,7 +864,7 @@
         assert(_type == 10)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.tp_port = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -913,7 +913,7 @@
         assert(_type == 9)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.tp_port = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -962,7 +962,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.vlan_pcp = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1011,7 +1011,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.vlan_vid = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -1055,7 +1055,7 @@
         assert(_type == 3)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
diff --git a/src/python/loxi/of10/common.py b/src/python/loxi/of10/common.py
index fb835a7..82916d6 100644
--- a/src/python/loxi/of10/common.py
+++ b/src/python/loxi/of10/common.py
@@ -113,7 +113,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -212,7 +212,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.flags = reader.read("!L")[0]
         obj.port_no = util.unpack_port_no(reader)
         obj.loopback_port_no = util.unpack_port_no(reader)
@@ -340,7 +340,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.port_no = reader.read("!L")[0]
         obj.ingress_tpid = reader.read("!H")[0]
         obj.ingress_vlan_id = reader.read("!H")[0]
@@ -460,7 +460,7 @@
         obj = flow_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.table_id = reader.read("!B")[0]
         reader.skip(1)
         obj.match = common.match.unpack(reader)
@@ -721,7 +721,7 @@
         obj.queue_id = reader.read("!L")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (4 + 2))
+        reader = orig_reader.slice(_len, 6)
         reader.skip(2)
         obj.properties = loxi.generic_util.unpack_list(reader, common.queue_prop.unpack)
         return obj
@@ -1051,7 +1051,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -1097,7 +1097,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.rate = reader.read("!H")[0]
         reader.skip(6)
diff --git a/src/python/loxi/of10/message.py b/src/python/loxi/of10/message.py
index 24b4e94..07f7dca 100644
--- a/src/python/loxi/of10/message.py
+++ b/src/python/loxi/of10/message.py
@@ -54,7 +54,7 @@
         obj.type = reader.read("!B")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -125,7 +125,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.stats_type = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -209,7 +209,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 2)
@@ -303,7 +303,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.stats_type = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -387,7 +387,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 2)
@@ -476,7 +476,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.err_type = reader.read("!H")[0]
         return obj
@@ -544,7 +544,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 2)
@@ -622,7 +622,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 1)
@@ -688,7 +688,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -742,7 +742,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -813,7 +813,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
@@ -888,7 +888,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -955,7 +955,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1022,7 +1022,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1089,7 +1089,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1156,7 +1156,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1228,7 +1228,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1305,7 +1305,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1377,7 +1377,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1444,7 +1444,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1517,7 +1517,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1596,7 +1596,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1676,7 +1676,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1750,7 +1750,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1818,7 +1818,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1892,7 +1892,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1972,7 +1972,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2046,7 +2046,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2123,7 +2123,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2221,7 +2221,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2314,7 +2314,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2401,7 +2401,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2499,7 +2499,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2593,7 +2593,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2682,7 +2682,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2772,7 +2772,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2852,7 +2852,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2925,7 +2925,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3018,7 +3018,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3116,7 +3116,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3193,7 +3193,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3265,7 +3265,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3352,7 +3352,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3442,7 +3442,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3532,7 +3532,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3622,7 +3622,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3702,7 +3702,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3779,7 +3779,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3851,7 +3851,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3923,7 +3923,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4018,7 +4018,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 0)
@@ -4111,7 +4111,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 0)
@@ -4177,7 +4177,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -4241,7 +4241,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -4331,7 +4331,7 @@
         assert(_type == 6)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.datapath_id = reader.read("!Q")[0]
         obj.n_buffers = reader.read("!L")[0]
@@ -4416,7 +4416,7 @@
         assert(_type == 5)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -4527,7 +4527,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.match = common.match.unpack(reader)
         obj.cookie = reader.read("!Q")[0]
@@ -4675,7 +4675,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.match = common.match.unpack(reader)
         obj.cookie = reader.read("!Q")[0]
@@ -4823,7 +4823,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.match = common.match.unpack(reader)
         obj.cookie = reader.read("!Q")[0]
@@ -4971,7 +4971,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.match = common.match.unpack(reader)
         obj.cookie = reader.read("!Q")[0]
@@ -5084,7 +5084,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 3)
@@ -5197,7 +5197,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.match = common.match.unpack(reader)
         obj.cookie = reader.read("!Q")[0]
@@ -5345,7 +5345,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.match = common.match.unpack(reader)
         obj.cookie = reader.read("!Q")[0]
@@ -5493,7 +5493,7 @@
         assert(_type == 11)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.match = common.match.unpack(reader)
         obj.cookie = reader.read("!Q")[0]
@@ -5606,7 +5606,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 1)
@@ -5695,7 +5695,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 1)
@@ -5782,7 +5782,7 @@
         assert(_type == 8)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.flags = reader.read("!H")[0]
         obj.miss_send_len = reader.read("!H")[0]
@@ -5846,7 +5846,7 @@
         assert(_type == 7)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -5900,7 +5900,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -5966,7 +5966,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 0)
@@ -6046,7 +6046,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
@@ -6113,7 +6113,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
@@ -6185,7 +6185,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
@@ -6274,7 +6274,7 @@
         assert(_type == 10)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.buffer_id = reader.read("!L")[0]
         obj.total_len = reader.read("!H")[0]
@@ -6376,7 +6376,7 @@
         assert(_type == 13)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.buffer_id = reader.read("!L")[0]
         obj.in_port = util.unpack_port_no(reader)
@@ -6477,7 +6477,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port_no = util.unpack_port_no(reader)
         obj.hw_addr = list(reader.read('!6B'))
@@ -6569,7 +6569,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 4)
@@ -6647,7 +6647,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 4)
@@ -6726,7 +6726,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 4)
@@ -6804,7 +6804,7 @@
         assert(_type == 12)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.reason = reader.read("!B")[0]
         reader.skip(7)
@@ -6880,7 +6880,7 @@
         assert(_type == 21)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port = util.unpack_port_no(reader)
         reader.skip(6)
@@ -6951,7 +6951,7 @@
         assert(_type == 20)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port = util.unpack_port_no(reader)
         reader.skip(2)
@@ -7023,7 +7023,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 5)
@@ -7101,7 +7101,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 5)
@@ -7185,7 +7185,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 5)
@@ -7267,7 +7267,7 @@
         assert(_type == 9)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.flags = reader.read("!H")[0]
         obj.miss_send_len = reader.read("!H")[0]
@@ -7342,7 +7342,7 @@
         assert(_type == 22)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.table_id = reader.read("!B")[0]
         reader.skip(3)
@@ -7419,7 +7419,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 3)
@@ -7492,7 +7492,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 3)
diff --git a/src/python/loxi/of11/action.py b/src/python/loxi/of11/action.py
index bd82ddf..6dc8b98 100644
--- a/src/python/loxi/of11/action.py
+++ b/src/python/loxi/of11/action.py
@@ -47,7 +47,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -103,7 +103,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -162,7 +162,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -214,7 +214,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -280,7 +280,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -346,7 +346,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -393,7 +393,7 @@
         assert(_type == 12)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -433,7 +433,7 @@
         assert(_type == 11)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -473,7 +473,7 @@
         assert(_type == 16)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -513,7 +513,7 @@
         assert(_type == 24)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -557,7 +557,7 @@
         assert(_type == 22)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.group_id = reader.read("!L")[0]
         return obj
 
@@ -615,7 +615,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         obj.subtype = reader.read("!H")[0]
@@ -665,7 +665,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         _subtype = reader.read("!H")[0]
@@ -720,7 +720,7 @@
         assert(_type == 0)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.port = util.unpack_port_no(reader)
         obj.max_len = reader.read("!H")[0]
         reader.skip(6)
@@ -774,7 +774,7 @@
         assert(_type == 20)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -818,7 +818,7 @@
         assert(_type == 18)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -863,7 +863,7 @@
         assert(_type == 19)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -912,7 +912,7 @@
         assert(_type == 17)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -961,7 +961,7 @@
         assert(_type == 4)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.dl_addr = list(reader.read('!6B'))
         reader.skip(6)
         return obj
@@ -1010,7 +1010,7 @@
         assert(_type == 3)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.dl_addr = list(reader.read('!6B'))
         reader.skip(6)
         return obj
@@ -1058,7 +1058,7 @@
         assert(_type == 13)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.mpls_label = reader.read("!L")[0]
         return obj
 
@@ -1106,7 +1106,7 @@
         assert(_type == 14)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.mpls_tc = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1155,7 +1155,7 @@
         assert(_type == 15)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.mpls_ttl = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1203,7 +1203,7 @@
         assert(_type == 6)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_addr = reader.read("!L")[0]
         return obj
 
@@ -1251,7 +1251,7 @@
         assert(_type == 8)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_ecn = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1299,7 +1299,7 @@
         assert(_type == 5)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_addr = reader.read("!L")[0]
         return obj
 
@@ -1347,7 +1347,7 @@
         assert(_type == 7)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_tos = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1396,7 +1396,7 @@
         assert(_type == 23)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_ttl = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1444,7 +1444,7 @@
         assert(_type == 21)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.queue_id = reader.read("!L")[0]
         return obj
 
@@ -1492,7 +1492,7 @@
         assert(_type == 10)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.tp_port = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -1541,7 +1541,7 @@
         assert(_type == 9)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.tp_port = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -1590,7 +1590,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.vlan_pcp = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1639,7 +1639,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.vlan_vid = reader.read("!H")[0]
         reader.skip(2)
         return obj
diff --git a/src/python/loxi/of11/common.py b/src/python/loxi/of11/common.py
index e379ce0..7452c19 100644
--- a/src/python/loxi/of11/common.py
+++ b/src/python/loxi/of11/common.py
@@ -114,7 +114,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -213,7 +213,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.flags = reader.read("!L")[0]
         obj.port_no = util.unpack_port_no(reader)
         obj.loopback_port_no = util.unpack_port_no(reader)
@@ -341,7 +341,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.port_no = reader.read("!L")[0]
         obj.ingress_tpid = reader.read("!H")[0]
         obj.ingress_vlan_id = reader.read("!H")[0]
@@ -425,7 +425,7 @@
         obj = bucket()
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (0 + 2))
+        reader = orig_reader.slice(_len, 2)
         obj.weight = reader.read("!H")[0]
         obj.watch_port = util.unpack_port_no(reader)
         obj.watch_group = reader.read("!L")[0]
@@ -581,7 +581,7 @@
         obj = flow_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.table_id = reader.read("!B")[0]
         reader.skip(1)
         obj.duration_sec = reader.read("!L")[0]
@@ -686,7 +686,7 @@
         obj = group_desc_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.group_type = reader.read("!B")[0]
         reader.skip(1)
         obj.group_id = reader.read("!L")[0]
@@ -761,7 +761,7 @@
         obj = group_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         reader.skip(2)
         obj.group_id = reader.read("!L")[0]
         obj.ref_count = reader.read("!L")[0]
@@ -931,7 +931,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.in_port = util.unpack_port_no(reader)
         obj.wildcards = util.unpack_wc_bmap(reader)
         obj.eth_src = list(reader.read('!6B'))
@@ -1082,7 +1082,7 @@
         obj.queue_id = reader.read("!L")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (4 + 2))
+        reader = orig_reader.slice(_len, 6)
         reader.skip(2)
         obj.properties = loxi.generic_util.unpack_list(reader, common.queue_prop.unpack)
         return obj
@@ -1436,7 +1436,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -1482,7 +1482,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.rate = reader.read("!H")[0]
         reader.skip(6)
diff --git a/src/python/loxi/of11/instruction.py b/src/python/loxi/of11/instruction.py
index e4d2fb0..7b66009 100644
--- a/src/python/loxi/of11/instruction.py
+++ b/src/python/loxi/of11/instruction.py
@@ -47,7 +47,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -92,7 +92,7 @@
         assert(_type == 4)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.actions = loxi.generic_util.unpack_list(reader, action.action.unpack)
         return obj
@@ -136,7 +136,7 @@
         assert(_type == 5)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -192,7 +192,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -242,7 +242,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.table_id = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -291,7 +291,7 @@
         assert(_type == 3)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.actions = loxi.generic_util.unpack_list(reader, action.action.unpack)
         return obj
@@ -345,7 +345,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.metadata = reader.read("!Q")[0]
         obj.metadata_mask = reader.read("!Q")[0]
diff --git a/src/python/loxi/of11/message.py b/src/python/loxi/of11/message.py
index c9f05a1..eee4f6e 100644
--- a/src/python/loxi/of11/message.py
+++ b/src/python/loxi/of11/message.py
@@ -55,7 +55,7 @@
         obj.type = reader.read("!B")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -127,7 +127,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.stats_type = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -213,7 +213,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 2)
@@ -309,7 +309,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.stats_type = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -411,7 +411,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 2)
@@ -517,7 +517,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.err_type = reader.read("!H")[0]
         return obj
@@ -585,7 +585,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 2)
@@ -663,7 +663,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 3)
@@ -741,7 +741,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 4)
@@ -819,7 +819,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 1)
@@ -885,7 +885,7 @@
         assert(_type == 21)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -939,7 +939,7 @@
         assert(_type == 20)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -1010,7 +1010,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
@@ -1085,7 +1085,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1152,7 +1152,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1219,7 +1219,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1286,7 +1286,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1353,7 +1353,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1425,7 +1425,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1502,7 +1502,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1574,7 +1574,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1641,7 +1641,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1709,7 +1709,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1783,7 +1783,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1866,7 +1866,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1964,7 +1964,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2057,7 +2057,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2144,7 +2144,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2242,7 +2242,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2331,7 +2331,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2404,7 +2404,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2497,7 +2497,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2607,7 +2607,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2699,7 +2699,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2791,7 +2791,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2883,7 +2883,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2963,7 +2963,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3040,7 +3040,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3112,7 +3112,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3184,7 +3184,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3280,7 +3280,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 0)
@@ -3375,7 +3375,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 0)
@@ -3442,7 +3442,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -3506,7 +3506,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -3596,7 +3596,7 @@
         assert(_type == 6)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.datapath_id = reader.read("!Q")[0]
         obj.n_buffers = reader.read("!L")[0]
@@ -3681,7 +3681,7 @@
         assert(_type == 5)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -3808,7 +3808,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -3988,7 +3988,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -4168,7 +4168,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -4348,7 +4348,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -4477,7 +4477,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 5)
@@ -4606,7 +4606,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -4786,7 +4786,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -4954,7 +4954,7 @@
         assert(_type == 11)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.priority = reader.read("!H")[0]
@@ -5072,7 +5072,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 1)
@@ -5179,7 +5179,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 1)
@@ -5283,7 +5283,7 @@
         assert(_type == 8)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.flags = reader.read("!H")[0]
         obj.miss_send_len = reader.read("!H")[0]
@@ -5347,7 +5347,7 @@
         assert(_type == 7)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -5429,7 +5429,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.command = reader.read("!H")[0]
         obj.group_type = reader.read("!B")[0]
@@ -5519,7 +5519,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 0)
@@ -5609,7 +5609,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 2)
@@ -5694,7 +5694,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 7)
@@ -5769,7 +5769,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 7)
@@ -5843,7 +5843,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 6)
@@ -5927,7 +5927,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 1)
@@ -6012,7 +6012,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 6)
@@ -6093,7 +6093,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 6)
@@ -6161,7 +6161,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -6227,7 +6227,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 0)
@@ -6307,7 +6307,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
@@ -6400,7 +6400,7 @@
         assert(_type == 10)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.buffer_id = reader.read("!L")[0]
         obj.in_port = util.unpack_port_no(reader)
@@ -6512,7 +6512,7 @@
         assert(_type == 13)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.buffer_id = reader.read("!L")[0]
         obj.in_port = util.unpack_port_no(reader)
@@ -6616,7 +6616,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port_no = util.unpack_port_no(reader)
         reader.skip(4)
@@ -6710,7 +6710,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 7)
@@ -6789,7 +6789,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 4)
@@ -6870,7 +6870,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 4)
@@ -6949,7 +6949,7 @@
         assert(_type == 12)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.reason = reader.read("!B")[0]
         reader.skip(7)
@@ -7025,7 +7025,7 @@
         assert(_type == 23)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port = util.unpack_port_no(reader)
         reader.skip(4)
@@ -7096,7 +7096,7 @@
         assert(_type == 22)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port = util.unpack_port_no(reader)
         reader.skip(4)
@@ -7168,7 +7168,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 9)
@@ -7247,7 +7247,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 5)
@@ -7332,7 +7332,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 5)
@@ -7414,7 +7414,7 @@
         assert(_type == 9)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.flags = reader.read("!H")[0]
         obj.miss_send_len = reader.read("!H")[0]
@@ -7490,7 +7490,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 10)
@@ -7567,7 +7567,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.table_id = reader.read("!B")[0]
         reader.skip(3)
@@ -7644,7 +7644,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 8)
@@ -7723,7 +7723,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 3)
@@ -7798,7 +7798,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 3)
diff --git a/src/python/loxi/of12/action.py b/src/python/loxi/of12/action.py
index 5cfd754..72685a7 100644
--- a/src/python/loxi/of12/action.py
+++ b/src/python/loxi/of12/action.py
@@ -48,7 +48,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -106,7 +106,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -165,7 +165,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -217,7 +217,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -283,7 +283,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -349,7 +349,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -396,7 +396,7 @@
         assert(_type == 12)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -436,7 +436,7 @@
         assert(_type == 11)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -476,7 +476,7 @@
         assert(_type == 16)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -516,7 +516,7 @@
         assert(_type == 24)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -560,7 +560,7 @@
         assert(_type == 22)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.group_id = reader.read("!L")[0]
         return obj
 
@@ -618,7 +618,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         obj.subtype = reader.read("!H")[0]
@@ -668,7 +668,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         _subtype = reader.read("!H")[0]
@@ -723,7 +723,7 @@
         assert(_type == 0)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.port = util.unpack_port_no(reader)
         obj.max_len = reader.read("!H")[0]
         reader.skip(6)
@@ -777,7 +777,7 @@
         assert(_type == 20)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -821,7 +821,7 @@
         assert(_type == 18)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -866,7 +866,7 @@
         assert(_type == 19)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -915,7 +915,7 @@
         assert(_type == 17)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -965,7 +965,7 @@
         assert(_type == 25)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.field = oxm.oxm.unpack(reader)
         return obj
 
@@ -1013,7 +1013,7 @@
         assert(_type == 15)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.mpls_ttl = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1062,7 +1062,7 @@
         assert(_type == 23)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_ttl = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1110,7 +1110,7 @@
         assert(_type == 21)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.queue_id = reader.read("!L")[0]
         return obj
 
diff --git a/src/python/loxi/of12/common.py b/src/python/loxi/of12/common.py
index 4bb1449..b091544 100644
--- a/src/python/loxi/of12/common.py
+++ b/src/python/loxi/of12/common.py
@@ -115,7 +115,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -214,7 +214,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.flags = reader.read("!L")[0]
         obj.port_no = util.unpack_port_no(reader)
         obj.loopback_port_no = util.unpack_port_no(reader)
@@ -342,7 +342,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.port_no = reader.read("!L")[0]
         obj.ingress_tpid = reader.read("!H")[0]
         obj.ingress_vlan_id = reader.read("!H")[0]
@@ -426,7 +426,7 @@
         obj = bucket()
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (0 + 2))
+        reader = orig_reader.slice(_len, 2)
         obj.weight = reader.read("!H")[0]
         obj.watch_port = util.unpack_port_no(reader)
         obj.watch_group = reader.read("!L")[0]
@@ -582,7 +582,7 @@
         obj = flow_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.table_id = reader.read("!B")[0]
         reader.skip(1)
         obj.duration_sec = reader.read("!L")[0]
@@ -687,7 +687,7 @@
         obj = group_desc_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.group_type = reader.read("!B")[0]
         reader.skip(1)
         obj.group_id = reader.read("!L")[0]
@@ -762,7 +762,7 @@
         obj = group_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         reader.skip(2)
         obj.group_id = reader.read("!L")[0]
         obj.ref_count = reader.read("!L")[0]
@@ -831,7 +831,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_list = loxi.generic_util.unpack_list(reader, oxm.oxm.unpack)
         orig_reader.skip_align()
         return obj
@@ -887,7 +887,7 @@
         obj.port = util.unpack_port_no(reader)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (8 + 2))
+        reader = orig_reader.slice(_len, 10)
         reader.skip(6)
         obj.properties = loxi.generic_util.unpack_list(reader, common.queue_prop.unpack)
         return obj
@@ -1245,7 +1245,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -1303,7 +1303,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.experimenter = reader.read("!L")[0]
         reader.skip(4)
@@ -1356,7 +1356,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.rate = reader.read("!H")[0]
         reader.skip(6)
@@ -1407,7 +1407,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.rate = reader.read("!H")[0]
         reader.skip(6)
diff --git a/src/python/loxi/of12/instruction.py b/src/python/loxi/of12/instruction.py
index 06786ed..915035d 100644
--- a/src/python/loxi/of12/instruction.py
+++ b/src/python/loxi/of12/instruction.py
@@ -48,7 +48,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -93,7 +93,7 @@
         assert(_type == 4)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.actions = loxi.generic_util.unpack_list(reader, action.action.unpack)
         return obj
@@ -137,7 +137,7 @@
         assert(_type == 5)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -193,7 +193,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -243,7 +243,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.table_id = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -292,7 +292,7 @@
         assert(_type == 3)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.actions = loxi.generic_util.unpack_list(reader, action.action.unpack)
         return obj
@@ -346,7 +346,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.metadata = reader.read("!Q")[0]
         obj.metadata_mask = reader.read("!Q")[0]
diff --git a/src/python/loxi/of12/message.py b/src/python/loxi/of12/message.py
index ab8f30b..e61b6da 100644
--- a/src/python/loxi/of12/message.py
+++ b/src/python/loxi/of12/message.py
@@ -56,7 +56,7 @@
         obj.type = reader.read("!B")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -128,7 +128,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.stats_type = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -214,7 +214,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 2)
@@ -310,7 +310,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.stats_type = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -412,7 +412,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 2)
@@ -518,7 +518,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.err_type = reader.read("!H")[0]
         return obj
@@ -586,7 +586,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 2)
@@ -664,7 +664,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 3)
@@ -742,7 +742,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 4)
@@ -820,7 +820,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 1)
@@ -886,7 +886,7 @@
         assert(_type == 21)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -940,7 +940,7 @@
         assert(_type == 20)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -1016,7 +1016,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.experimenter = reader.read("!L")[0]
         obj.subtype = reader.read("!L")[0]
@@ -1096,7 +1096,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1163,7 +1163,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1230,7 +1230,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1297,7 +1297,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1364,7 +1364,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1436,7 +1436,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1513,7 +1513,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1585,7 +1585,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1652,7 +1652,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1720,7 +1720,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1794,7 +1794,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1877,7 +1877,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1975,7 +1975,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2068,7 +2068,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2155,7 +2155,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2253,7 +2253,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2342,7 +2342,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2415,7 +2415,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2508,7 +2508,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2622,7 +2622,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2718,7 +2718,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2814,7 +2814,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2910,7 +2910,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2990,7 +2990,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3067,7 +3067,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3139,7 +3139,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3211,7 +3211,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3307,7 +3307,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 0)
@@ -3402,7 +3402,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 0)
@@ -3469,7 +3469,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -3533,7 +3533,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -3609,7 +3609,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 65535)
@@ -3711,7 +3711,7 @@
         assert(_type == 6)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.datapath_id = reader.read("!Q")[0]
         obj.n_buffers = reader.read("!L")[0]
@@ -3796,7 +3796,7 @@
         assert(_type == 5)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -3923,7 +3923,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -4103,7 +4103,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -4283,7 +4283,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -4463,7 +4463,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -4592,7 +4592,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 5)
@@ -4721,7 +4721,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -4901,7 +4901,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -5073,7 +5073,7 @@
         assert(_type == 11)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.priority = reader.read("!H")[0]
@@ -5195,7 +5195,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 1)
@@ -5302,7 +5302,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 1)
@@ -5406,7 +5406,7 @@
         assert(_type == 8)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.flags = reader.read("!H")[0]
         obj.miss_send_len = reader.read("!H")[0]
@@ -5470,7 +5470,7 @@
         assert(_type == 7)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -5552,7 +5552,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.command = reader.read("!H")[0]
         obj.group_type = reader.read("!B")[0]
@@ -5642,7 +5642,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 0)
@@ -5732,7 +5732,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 2)
@@ -5817,7 +5817,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 7)
@@ -5892,7 +5892,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 7)
@@ -6012,7 +6012,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 8)
@@ -6132,7 +6132,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 8)
@@ -6206,7 +6206,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 6)
@@ -6290,7 +6290,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 1)
@@ -6375,7 +6375,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 6)
@@ -6456,7 +6456,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 6)
@@ -6524,7 +6524,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -6590,7 +6590,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 0)
@@ -6670,7 +6670,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
@@ -6759,7 +6759,7 @@
         assert(_type == 10)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.buffer_id = reader.read("!L")[0]
         obj.total_len = reader.read("!H")[0]
@@ -6867,7 +6867,7 @@
         assert(_type == 13)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.buffer_id = reader.read("!L")[0]
         obj.in_port = util.unpack_port_no(reader)
@@ -6971,7 +6971,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port_no = util.unpack_port_no(reader)
         reader.skip(4)
@@ -7065,7 +7065,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 7)
@@ -7144,7 +7144,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 4)
@@ -7225,7 +7225,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 4)
@@ -7304,7 +7304,7 @@
         assert(_type == 12)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.reason = reader.read("!B")[0]
         reader.skip(7)
@@ -7380,7 +7380,7 @@
         assert(_type == 23)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port = util.unpack_port_no(reader)
         reader.skip(4)
@@ -7451,7 +7451,7 @@
         assert(_type == 22)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port = util.unpack_port_no(reader)
         reader.skip(4)
@@ -7523,7 +7523,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 9)
@@ -7602,7 +7602,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 5)
@@ -7687,7 +7687,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 5)
@@ -7770,7 +7770,7 @@
         assert(_type == 25)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.role = reader.read("!L")[0]
         reader.skip(4)
@@ -7846,7 +7846,7 @@
         assert(_type == 24)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.role = reader.read("!L")[0]
         reader.skip(4)
@@ -7923,7 +7923,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 11)
@@ -7999,7 +7999,7 @@
         assert(_type == 9)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.flags = reader.read("!H")[0]
         obj.miss_send_len = reader.read("!H")[0]
@@ -8075,7 +8075,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 10)
@@ -8152,7 +8152,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.table_id = reader.read("!B")[0]
         reader.skip(3)
@@ -8229,7 +8229,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 8)
@@ -8308,7 +8308,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 3)
@@ -8383,7 +8383,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 3)
diff --git a/src/python/loxi/of13/action.py b/src/python/loxi/of13/action.py
index 04b17de..5c1eda7 100644
--- a/src/python/loxi/of13/action.py
+++ b/src/python/loxi/of13/action.py
@@ -52,7 +52,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -110,7 +110,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -169,7 +169,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -221,7 +221,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -281,7 +281,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -352,7 +352,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -418,7 +418,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -465,7 +465,7 @@
         assert(_type == 12)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -505,7 +505,7 @@
         assert(_type == 11)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -545,7 +545,7 @@
         assert(_type == 16)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -585,7 +585,7 @@
         assert(_type == 24)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -629,7 +629,7 @@
         assert(_type == 22)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.group_id = reader.read("!L")[0]
         return obj
 
@@ -687,7 +687,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         obj.subtype = reader.read("!H")[0]
@@ -737,7 +737,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         _subtype = reader.read("!H")[0]
@@ -792,7 +792,7 @@
         assert(_type == 0)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.port = util.unpack_port_no(reader)
         obj.max_len = reader.read("!H")[0]
         reader.skip(6)
@@ -846,7 +846,7 @@
         assert(_type == 20)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -890,7 +890,7 @@
         assert(_type == 27)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -930,7 +930,7 @@
         assert(_type == 18)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -975,7 +975,7 @@
         assert(_type == 19)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -1024,7 +1024,7 @@
         assert(_type == 26)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -1073,7 +1073,7 @@
         assert(_type == 17)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -1123,7 +1123,7 @@
         assert(_type == 25)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.field = oxm.oxm.unpack(reader)
         return obj
 
@@ -1171,7 +1171,7 @@
         assert(_type == 15)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.mpls_ttl = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1220,7 +1220,7 @@
         assert(_type == 23)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_ttl = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1268,7 +1268,7 @@
         assert(_type == 21)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.queue_id = reader.read("!L")[0]
         return obj
 
diff --git a/src/python/loxi/of13/action_id.py b/src/python/loxi/of13/action_id.py
index b8e1a06..b30383e 100644
--- a/src/python/loxi/of13/action_id.py
+++ b/src/python/loxi/of13/action_id.py
@@ -51,7 +51,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -101,7 +101,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         return obj
 
@@ -155,7 +155,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -201,7 +201,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -247,7 +247,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -293,7 +293,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -339,7 +339,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -381,7 +381,7 @@
         assert(_type == 12)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -419,7 +419,7 @@
         assert(_type == 11)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -457,7 +457,7 @@
         assert(_type == 16)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -495,7 +495,7 @@
         assert(_type == 24)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -533,7 +533,7 @@
         assert(_type == 22)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -585,7 +585,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         obj.subtype = reader.read("!H")[0]
@@ -631,7 +631,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         _subtype = reader.read("!H")[0]
@@ -673,7 +673,7 @@
         assert(_type == 0)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -711,7 +711,7 @@
         assert(_type == 20)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -749,7 +749,7 @@
         assert(_type == 27)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -787,7 +787,7 @@
         assert(_type == 18)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -825,7 +825,7 @@
         assert(_type == 19)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -863,7 +863,7 @@
         assert(_type == 26)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -901,7 +901,7 @@
         assert(_type == 17)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -939,7 +939,7 @@
         assert(_type == 25)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -977,7 +977,7 @@
         assert(_type == 15)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -1015,7 +1015,7 @@
         assert(_type == 23)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -1053,7 +1053,7 @@
         assert(_type == 21)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
diff --git a/src/python/loxi/of13/bsn_tlv.py b/src/python/loxi/of13/bsn_tlv.py
index 422f80a..9753693 100644
--- a/src/python/loxi/of13/bsn_tlv.py
+++ b/src/python/loxi/of13/bsn_tlv.py
@@ -51,7 +51,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -94,7 +94,7 @@
         assert(_type == 44)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -141,7 +141,7 @@
         assert(_type == 43)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -188,7 +188,7 @@
         assert(_type == 42)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -235,7 +235,7 @@
         assert(_type == 53)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!B")[0]
         return obj
 
@@ -282,7 +282,7 @@
         assert(_type == 41)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -329,7 +329,7 @@
         assert(_type == 40)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -376,7 +376,7 @@
         assert(_type == 10)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -397,6 +397,53 @@
 
 bsn_tlv.subtypes[10] = broadcast_query_timeout
 
+class bucket(bsn_tlv):
+    type = 64
+
+    def __init__(self, value=None):
+        if value != None:
+            self.value = value
+        else:
+            self.value = []
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 1
+        packed.append(loxi.generic_util.pack_list(self.value))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = bucket()
+        _type = reader.read("!H")[0]
+        assert(_type == 64)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.value = loxi.generic_util.unpack_list(reader, bsn_tlv.bsn_tlv.unpack)
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.value != other.value: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("bucket {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("value = ");
+                q.pp(self.value)
+            q.breakable()
+        q.text('}')
+
+bsn_tlv.subtypes[64] = bucket
+
 class circuit_id(bsn_tlv):
     type = 14
 
@@ -423,7 +470,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = str(reader.read_all())
         return obj
 
@@ -470,7 +517,7 @@
         assert(_type == 45)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!B")[0]
         return obj
 
@@ -517,7 +564,7 @@
         assert(_type == 22)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!B")[0]
         return obj
 
@@ -564,7 +611,7 @@
         assert(_type == 55)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = str(reader.read_all())
         return obj
 
@@ -611,7 +658,7 @@
         assert(_type == 33)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -658,7 +705,7 @@
         assert(_type == 32)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -705,7 +752,7 @@
         assert(_type == 26)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -752,7 +799,7 @@
         assert(_type == 29)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -799,7 +846,7 @@
         assert(_type == 23)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -846,7 +893,7 @@
         assert(_type == 24)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -893,7 +940,7 @@
         assert(_type == 25)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -940,7 +987,7 @@
         assert(_type == 31)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -982,7 +1029,7 @@
         assert(_type == 7)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -1025,7 +1072,7 @@
         assert(_type == 5)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -1072,7 +1119,7 @@
         assert(_type == 8)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1119,7 +1166,7 @@
         assert(_type == 28)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -1166,7 +1213,7 @@
         assert(_type == 27)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -1213,7 +1260,7 @@
         assert(_type == 58)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1260,7 +1307,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1307,7 +1354,7 @@
         assert(_type == 35)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1354,7 +1401,7 @@
         assert(_type == 60)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1401,7 +1448,7 @@
         assert(_type == 34)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1448,7 +1495,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -1495,7 +1542,7 @@
         assert(_type == 56)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -1542,7 +1589,7 @@
         assert(_type == 13)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -1563,6 +1610,147 @@
 
 bsn_tlv.subtypes[13] = miss_packets
 
+class mpls_control_word(bsn_tlv):
+    type = 62
+
+    def __init__(self, value=None):
+        if value != None:
+            self.value = value
+        else:
+            self.value = 0
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 1
+        packed.append(struct.pack("!B", self.value))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = mpls_control_word()
+        _type = reader.read("!H")[0]
+        assert(_type == 62)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.value = reader.read("!B")[0]
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.value != other.value: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("mpls_control_word {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("value = ");
+                q.text("%#x" % self.value)
+            q.breakable()
+        q.text('}')
+
+bsn_tlv.subtypes[62] = mpls_control_word
+
+class mpls_label(bsn_tlv):
+    type = 61
+
+    def __init__(self, value=None):
+        if value != None:
+            self.value = value
+        else:
+            self.value = 0
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 1
+        packed.append(struct.pack("!L", self.value))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = mpls_label()
+        _type = reader.read("!H")[0]
+        assert(_type == 61)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.value = reader.read("!L")[0]
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.value != other.value: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("mpls_label {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("value = ");
+                q.text("%#x" % self.value)
+            q.breakable()
+        q.text('}')
+
+bsn_tlv.subtypes[61] = mpls_label
+
+class mpls_sequenced(bsn_tlv):
+    type = 63
+
+    def __init__(self, value=None):
+        if value != None:
+            self.value = value
+        else:
+            self.value = 0
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 1
+        packed.append(struct.pack("!B", self.value))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = mpls_sequenced()
+        _type = reader.read("!H")[0]
+        assert(_type == 63)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.value = reader.read("!B")[0]
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.value != other.value: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("mpls_sequenced {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("value = ");
+                q.text("%#x" % self.value)
+            q.breakable()
+        q.text('}')
+
+bsn_tlv.subtypes[63] = mpls_sequenced
+
 class name(bsn_tlv):
     type = 52
 
@@ -1589,7 +1777,7 @@
         assert(_type == 52)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = str(reader.read_all())
         return obj
 
@@ -1636,7 +1824,7 @@
         assert(_type == 51)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -1683,7 +1871,7 @@
         assert(_type == 50)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -1730,7 +1918,7 @@
         assert(_type == 49)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -1777,7 +1965,7 @@
         assert(_type == 54)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!B")[0]
         return obj
 
@@ -1824,7 +2012,7 @@
         assert(_type == 48)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -1871,7 +2059,7 @@
         assert(_type == 47)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -1918,7 +2106,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = util.unpack_port_no(reader)
         return obj
 
@@ -1965,7 +2153,7 @@
         assert(_type == 57)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2012,7 +2200,7 @@
         assert(_type == 20)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2059,7 +2247,7 @@
         assert(_type == 21)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2111,7 +2299,7 @@
         assert(_type == 59)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.table_id = reader.read("!H")[0]
         obj.key = loxi.generic_util.unpack_list(reader, bsn_tlv.bsn_tlv.unpack)
         return obj
@@ -2163,7 +2351,7 @@
         assert(_type == 12)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -2210,7 +2398,7 @@
         assert(_type == 11)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -2257,7 +2445,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -2304,7 +2492,7 @@
         assert(_type == 30)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2351,7 +2539,7 @@
         assert(_type == 38)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2398,7 +2586,7 @@
         assert(_type == 39)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -2445,7 +2633,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -2492,7 +2680,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2539,7 +2727,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2586,7 +2774,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2633,7 +2821,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2680,7 +2868,7 @@
         assert(_type == 37)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2727,7 +2915,7 @@
         assert(_type == 36)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2774,7 +2962,7 @@
         assert(_type == 9)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2821,7 +3009,7 @@
         assert(_type == 6)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2868,7 +3056,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
diff --git a/src/python/loxi/of13/common.py b/src/python/loxi/of13/common.py
index 361865d..72f6f85 100644
--- a/src/python/loxi/of13/common.py
+++ b/src/python/loxi/of13/common.py
@@ -227,6 +227,48 @@
         q.text('}')
 
 
+class bsn_generic_stats_entry(loxi.OFObject):
+
+    def __init__(self, tlvs=None):
+        if tlvs != None:
+            self.tlvs = tlvs
+        else:
+            self.tlvs = []
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 0
+        packed.append(loxi.generic_util.pack_list(self.tlvs))
+        length = sum([len(x) for x in packed])
+        packed[0] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = bsn_generic_stats_entry()
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 2)
+        obj.tlvs = loxi.generic_util.unpack_list(reader, bsn_tlv.bsn_tlv.unpack)
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.tlvs != other.tlvs: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("bsn_generic_stats_entry {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("tlvs = ");
+                q.pp(self.tlvs)
+            q.breakable()
+        q.text('}')
+
+
 class bsn_gentable_bucket_stats_entry(loxi.OFObject):
 
     def __init__(self, checksum=None):
@@ -301,7 +343,7 @@
         obj = bsn_gentable_desc_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.table_id = reader.read("!H")[0]
         obj.name = reader.read("!32s")[0].rstrip("\x00")
         obj.buckets_size = reader.read("!L")[0]
@@ -371,7 +413,7 @@
         obj = bsn_gentable_entry_desc_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         _key_length = reader.read("!H")[0]
         obj.checksum = util.unpack_checksum_128(reader)
         obj.key = loxi.generic_util.unpack_list(reader.slice(_key_length), bsn_tlv.bsn_tlv.unpack)
@@ -431,7 +473,7 @@
         obj = bsn_gentable_entry_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         _key_length = reader.read("!H")[0]
         obj.key = loxi.generic_util.unpack_list(reader.slice(_key_length), bsn_tlv.bsn_tlv.unpack)
         obj.stats = loxi.generic_util.unpack_list(reader, bsn_tlv.bsn_tlv.unpack)
@@ -761,7 +803,7 @@
         obj = bsn_port_counter_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         reader.skip(2)
         obj.port_no = util.unpack_port_no(reader)
         obj.values = loxi.generic_util.unpack_list(reader, common.uint64.unpack)
@@ -899,7 +941,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -944,7 +986,7 @@
         obj = bsn_vlan_counter_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.vlan_vid = reader.read("!H")[0]
         reader.skip(4)
         obj.values = loxi.generic_util.unpack_list(reader, common.uint64.unpack)
@@ -1052,7 +1094,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.flags = reader.read("!L")[0]
         obj.port_no = util.unpack_port_no(reader)
         obj.loopback_port_no = util.unpack_port_no(reader)
@@ -1180,7 +1222,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.port_no = reader.read("!L")[0]
         obj.ingress_tpid = reader.read("!H")[0]
         obj.ingress_vlan_id = reader.read("!H")[0]
@@ -1254,7 +1296,7 @@
         obj = bsn_vrf_counter_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         reader.skip(2)
         obj.vrf = reader.read("!L")[0]
         obj.values = loxi.generic_util.unpack_list(reader, common.uint64.unpack)
@@ -1318,7 +1360,7 @@
         obj = bucket()
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (0 + 2))
+        reader = orig_reader.slice(_len, 2)
         obj.weight = reader.read("!H")[0]
         obj.watch_port = util.unpack_port_no(reader)
         obj.watch_group = reader.read("!L")[0]
@@ -1479,7 +1521,7 @@
         obj = flow_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.table_id = reader.read("!B")[0]
         reader.skip(1)
         obj.duration_sec = reader.read("!L")[0]
@@ -1589,7 +1631,7 @@
         obj = group_desc_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.group_type = reader.read("!B")[0]
         reader.skip(1)
         obj.group_id = reader.read("!L")[0]
@@ -1674,7 +1716,7 @@
         obj = group_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         reader.skip(2)
         obj.group_id = reader.read("!L")[0]
         obj.ref_count = reader.read("!L")[0]
@@ -1756,7 +1798,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -1799,7 +1841,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.bitmaps = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -1847,7 +1889,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_list = loxi.generic_util.unpack_list(reader, oxm.oxm.unpack)
         orig_reader.skip_align()
         return obj
@@ -1946,7 +1988,7 @@
         obj = meter_config()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.flags = reader.read("!H")[0]
         obj.meter_id = reader.read("!L")[0]
         obj.entries = loxi.generic_util.unpack_list(reader, meter_band.meter_band.unpack)
@@ -2108,7 +2150,7 @@
         obj.meter_id = reader.read("!L")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (4 + 2))
+        reader = orig_reader.slice(_len, 6)
         reader.skip(6)
         obj.flow_count = reader.read("!L")[0]
         obj.packet_in_count = reader.read("!Q")[0]
@@ -2193,7 +2235,7 @@
         obj.port = util.unpack_port_no(reader)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (8 + 2))
+        reader = orig_reader.slice(_len, 10)
         reader.skip(6)
         obj.properties = loxi.generic_util.unpack_list(reader, common.queue_prop.unpack)
         return obj
@@ -2571,7 +2613,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -2629,7 +2671,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.experimenter = reader.read("!L")[0]
         reader.skip(4)
@@ -2682,7 +2724,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.rate = reader.read("!H")[0]
         reader.skip(6)
@@ -2733,7 +2775,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.rate = reader.read("!H")[0]
         reader.skip(6)
@@ -2882,7 +2924,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -2925,7 +2967,7 @@
         assert(_type == 6)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.action_ids = loxi.generic_util.unpack_list(reader, action_id.action_id.unpack)
         return obj
 
@@ -2972,7 +3014,7 @@
         assert(_type == 7)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.action_ids = loxi.generic_util.unpack_list(reader, action_id.action_id.unpack)
         return obj
 
@@ -3019,7 +3061,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3066,7 +3108,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3130,7 +3172,7 @@
         assert(_type == 65534)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.subtype = reader.read("!L")[0]
         obj.experimenter_data = str(reader.read_all())
@@ -3201,7 +3243,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.subtype = reader.read("!L")[0]
         obj.experimenter_data = str(reader.read_all())
@@ -3255,7 +3297,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.instruction_ids = loxi.generic_util.unpack_list(reader, instruction_id.instruction_id.unpack)
         return obj
 
@@ -3302,7 +3344,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.instruction_ids = loxi.generic_util.unpack_list(reader, instruction_id.instruction_id.unpack)
         return obj
 
@@ -3349,7 +3391,7 @@
         assert(_type == 8)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3396,7 +3438,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.next_table_ids = loxi.generic_util.unpack_list(reader, common.uint8.unpack)
         return obj
 
@@ -3443,7 +3485,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.next_table_ids = loxi.generic_util.unpack_list(reader, common.uint8.unpack)
         return obj
 
@@ -3490,7 +3532,7 @@
         assert(_type == 10)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3537,7 +3579,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.action_ids = loxi.generic_util.unpack_list(reader, action_id.action_id.unpack)
         return obj
 
@@ -3584,7 +3626,7 @@
         assert(_type == 5)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.action_ids = loxi.generic_util.unpack_list(reader, action_id.action_id.unpack)
         return obj
 
@@ -3631,7 +3673,7 @@
         assert(_type == 12)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3678,7 +3720,7 @@
         assert(_type == 13)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3752,7 +3794,7 @@
         obj = table_features()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.table_id = reader.read("!B")[0]
         reader.skip(5)
         obj.name = reader.read("!32s")[0].rstrip("\x00")
diff --git a/src/python/loxi/of13/instruction.py b/src/python/loxi/of13/instruction.py
index 49c7d1c..ef537dd 100644
--- a/src/python/loxi/of13/instruction.py
+++ b/src/python/loxi/of13/instruction.py
@@ -51,7 +51,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -95,7 +95,7 @@
         assert(_type == 4)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.actions = loxi.generic_util.unpack_list(reader, action.action.unpack)
         return obj
@@ -155,7 +155,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -214,7 +214,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -262,7 +262,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -310,7 +310,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -358,7 +358,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -406,7 +406,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -454,7 +454,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -502,7 +502,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -550,7 +550,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -598,7 +598,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -646,7 +646,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -694,7 +694,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -742,7 +742,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -790,7 +790,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -834,7 +834,7 @@
         assert(_type == 5)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -879,7 +879,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.table_id = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -927,7 +927,7 @@
         assert(_type == 6)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.meter_id = reader.read("!L")[0]
         return obj
 
@@ -975,7 +975,7 @@
         assert(_type == 3)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.actions = loxi.generic_util.unpack_list(reader, action.action.unpack)
         return obj
@@ -1029,7 +1029,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.metadata = reader.read("!Q")[0]
         obj.metadata_mask = reader.read("!Q")[0]
diff --git a/src/python/loxi/of13/instruction_id.py b/src/python/loxi/of13/instruction_id.py
index 3b88750..4207f2a 100644
--- a/src/python/loxi/of13/instruction_id.py
+++ b/src/python/loxi/of13/instruction_id.py
@@ -51,7 +51,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -89,7 +89,7 @@
         assert(_type == 4)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -139,7 +139,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         return obj
 
@@ -193,7 +193,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -239,7 +239,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -285,7 +285,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -331,7 +331,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -377,7 +377,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -423,7 +423,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -469,7 +469,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -515,7 +515,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -561,7 +561,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -607,7 +607,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -653,7 +653,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -699,7 +699,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -745,7 +745,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -787,7 +787,7 @@
         assert(_type == 5)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -825,7 +825,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -863,7 +863,7 @@
         assert(_type == 6)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -901,7 +901,7 @@
         assert(_type == 3)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -939,7 +939,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
diff --git a/src/python/loxi/of13/message.py b/src/python/loxi/of13/message.py
index db67eff..962359d 100644
--- a/src/python/loxi/of13/message.py
+++ b/src/python/loxi/of13/message.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!B")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -132,7 +132,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.stats_type = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -218,7 +218,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 2)
@@ -314,7 +314,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.stats_type = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -416,7 +416,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 2)
@@ -540,7 +540,7 @@
         assert(_type == 27)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.packet_in_mask_equal_master = reader.read("!L")[0]
         obj.packet_in_mask_slave = reader.read("!L")[0]
@@ -654,7 +654,7 @@
         assert(_type == 26)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.packet_in_mask_equal_master = reader.read("!L")[0]
         obj.packet_in_mask_slave = reader.read("!L")[0]
@@ -768,7 +768,7 @@
         assert(_type == 28)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.packet_in_mask_equal_master = reader.read("!L")[0]
         obj.packet_in_mask_slave = reader.read("!L")[0]
@@ -864,7 +864,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.err_type = reader.read("!H")[0]
         return obj
@@ -932,7 +932,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 2)
@@ -1010,7 +1010,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 3)
@@ -1088,7 +1088,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 4)
@@ -1166,7 +1166,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 1)
@@ -1232,7 +1232,7 @@
         assert(_type == 21)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -1286,7 +1286,7 @@
         assert(_type == 20)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -1362,7 +1362,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.experimenter = reader.read("!L")[0]
         obj.subtype = reader.read("!L")[0]
@@ -1442,7 +1442,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1515,7 +1515,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1593,7 +1593,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1660,7 +1660,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1727,7 +1727,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1794,7 +1794,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1866,7 +1866,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1943,7 +1943,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2015,7 +2015,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2082,7 +2082,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2165,7 +2165,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2256,7 +2256,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2339,7 +2339,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2435,7 +2435,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2526,7 +2526,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2604,7 +2604,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2687,7 +2687,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2770,7 +2770,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2853,7 +2853,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2941,7 +2941,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3037,7 +3037,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3125,7 +3125,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3192,7 +3192,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3264,7 +3264,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3341,7 +3341,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3374,6 +3374,192 @@
 
 bsn_header.subtypes[36] = bsn_flow_idle_enable_set_request
 
+class bsn_generic_stats_reply(bsn_stats_reply):
+    version = 4
+    type = 19
+    stats_type = 65535
+    experimenter = 6035143
+    subtype = 16
+
+    def __init__(self, xid=None, flags=None, entries=None):
+        if xid != None:
+            self.xid = xid
+        else:
+            self.xid = None
+        if flags != None:
+            self.flags = flags
+        else:
+            self.flags = 0
+        if entries != None:
+            self.entries = entries
+        else:
+            self.entries = []
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!B", self.version))
+        packed.append(struct.pack("!B", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 2
+        packed.append(struct.pack("!L", self.xid))
+        packed.append(struct.pack("!H", self.stats_type))
+        packed.append(struct.pack("!H", self.flags))
+        packed.append('\x00' * 4)
+        packed.append(struct.pack("!L", self.experimenter))
+        packed.append(struct.pack("!L", self.subtype))
+        packed.append(loxi.generic_util.pack_list(self.entries))
+        length = sum([len(x) for x in packed])
+        packed[2] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = bsn_generic_stats_reply()
+        _version = reader.read("!B")[0]
+        assert(_version == 4)
+        _type = reader.read("!B")[0]
+        assert(_type == 19)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.xid = reader.read("!L")[0]
+        _stats_type = reader.read("!H")[0]
+        assert(_stats_type == 65535)
+        obj.flags = reader.read("!H")[0]
+        reader.skip(4)
+        _experimenter = reader.read("!L")[0]
+        assert(_experimenter == 6035143)
+        _subtype = reader.read("!L")[0]
+        assert(_subtype == 16)
+        obj.entries = loxi.generic_util.unpack_list(reader, common.bsn_generic_stats_entry.unpack)
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.xid != other.xid: return False
+        if self.flags != other.flags: return False
+        if self.entries != other.entries: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("bsn_generic_stats_reply {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("xid = ");
+                if self.xid != None:
+                    q.text("%#x" % self.xid)
+                else:
+                    q.text('None')
+                q.text(","); q.breakable()
+                q.text("flags = ");
+                q.text("%#x" % self.flags)
+                q.text(","); q.breakable()
+                q.text("entries = ");
+                q.pp(self.entries)
+            q.breakable()
+        q.text('}')
+
+bsn_stats_reply.subtypes[16] = bsn_generic_stats_reply
+
+class bsn_generic_stats_request(bsn_stats_request):
+    version = 4
+    type = 18
+    stats_type = 65535
+    experimenter = 6035143
+    subtype = 16
+
+    def __init__(self, xid=None, flags=None, name=None, tlvs=None):
+        if xid != None:
+            self.xid = xid
+        else:
+            self.xid = None
+        if flags != None:
+            self.flags = flags
+        else:
+            self.flags = 0
+        if name != None:
+            self.name = name
+        else:
+            self.name = ""
+        if tlvs != None:
+            self.tlvs = tlvs
+        else:
+            self.tlvs = []
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!B", self.version))
+        packed.append(struct.pack("!B", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 2
+        packed.append(struct.pack("!L", self.xid))
+        packed.append(struct.pack("!H", self.stats_type))
+        packed.append(struct.pack("!H", self.flags))
+        packed.append('\x00' * 4)
+        packed.append(struct.pack("!L", self.experimenter))
+        packed.append(struct.pack("!L", self.subtype))
+        packed.append(struct.pack("!64s", self.name))
+        packed.append(loxi.generic_util.pack_list(self.tlvs))
+        length = sum([len(x) for x in packed])
+        packed[2] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = bsn_generic_stats_request()
+        _version = reader.read("!B")[0]
+        assert(_version == 4)
+        _type = reader.read("!B")[0]
+        assert(_type == 18)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.xid = reader.read("!L")[0]
+        _stats_type = reader.read("!H")[0]
+        assert(_stats_type == 65535)
+        obj.flags = reader.read("!H")[0]
+        reader.skip(4)
+        _experimenter = reader.read("!L")[0]
+        assert(_experimenter == 6035143)
+        _subtype = reader.read("!L")[0]
+        assert(_subtype == 16)
+        obj.name = reader.read("!64s")[0].rstrip("\x00")
+        obj.tlvs = loxi.generic_util.unpack_list(reader, bsn_tlv.bsn_tlv.unpack)
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.xid != other.xid: return False
+        if self.flags != other.flags: return False
+        if self.name != other.name: return False
+        if self.tlvs != other.tlvs: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("bsn_generic_stats_request {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("xid = ");
+                if self.xid != None:
+                    q.text("%#x" % self.xid)
+                else:
+                    q.text('None')
+                q.text(","); q.breakable()
+                q.text("flags = ");
+                q.text("%#x" % self.flags)
+                q.text(","); q.breakable()
+                q.text("name = ");
+                q.pp(self.name)
+                q.text(","); q.breakable()
+                q.text("tlvs = ");
+                q.pp(self.tlvs)
+            q.breakable()
+        q.text('}')
+
+bsn_stats_request.subtypes[16] = bsn_generic_stats_request
+
 class bsn_gentable_bucket_stats_reply(bsn_stats_reply):
     version = 4
     type = 19
@@ -3421,7 +3607,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3509,7 +3695,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3600,7 +3786,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3694,7 +3880,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3785,7 +3971,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3868,7 +4054,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3960,7 +4146,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4053,7 +4239,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4138,7 +4324,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4237,7 +4423,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4336,7 +4522,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4435,7 +4621,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4532,7 +4718,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4618,7 +4804,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4701,7 +4887,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4776,7 +4962,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4843,7 +5029,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4911,7 +5097,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4985,7 +5171,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5058,7 +5244,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5125,7 +5311,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5205,7 +5391,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -5293,7 +5479,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -5424,7 +5610,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5560,7 +5746,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -5643,7 +5829,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -5723,7 +5909,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5810,7 +5996,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5908,7 +6094,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6001,7 +6187,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6088,7 +6274,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6186,7 +6372,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6282,7 +6468,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -6370,7 +6556,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -6461,7 +6647,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6549,7 +6735,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6626,7 +6812,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6703,7 +6889,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6811,7 +6997,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6915,7 +7101,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6988,7 +7174,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7081,7 +7267,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7174,7 +7360,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7246,7 +7432,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7326,7 +7512,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -7409,7 +7595,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -7492,7 +7678,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -7575,7 +7761,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -7657,7 +7843,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7736,7 +7922,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7803,7 +7989,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7875,7 +8061,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7952,7 +8138,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -8024,7 +8210,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -8096,7 +8282,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -8176,7 +8362,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -8264,7 +8450,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -8352,7 +8538,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -8440,7 +8626,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -8544,7 +8730,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 0)
@@ -8639,7 +8825,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 0)
@@ -8706,7 +8892,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -8770,7 +8956,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -8846,7 +9032,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 65535)
@@ -8948,7 +9134,7 @@
         assert(_type == 6)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.datapath_id = reader.read("!Q")[0]
         obj.n_buffers = reader.read("!L")[0]
@@ -9033,7 +9219,7 @@
         assert(_type == 5)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -9160,7 +9346,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -9340,7 +9526,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -9520,7 +9706,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -9700,7 +9886,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -9829,7 +10015,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 5)
@@ -9958,7 +10144,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -10138,7 +10324,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -10310,7 +10496,7 @@
         assert(_type == 11)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.priority = reader.read("!H")[0]
@@ -10432,7 +10618,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 1)
@@ -10539,7 +10725,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 1)
@@ -10643,7 +10829,7 @@
         assert(_type == 8)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.flags = reader.read("!H")[0]
         obj.miss_send_len = reader.read("!H")[0]
@@ -10707,7 +10893,7 @@
         assert(_type == 7)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -10789,7 +10975,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.command = reader.read("!H")[0]
         obj.group_type = reader.read("!B")[0]
@@ -10879,7 +11065,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 0)
@@ -10969,7 +11155,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 2)
@@ -11054,7 +11240,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 7)
@@ -11129,7 +11315,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 7)
@@ -11249,7 +11435,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 8)
@@ -11369,7 +11555,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 8)
@@ -11443,7 +11629,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 6)
@@ -11527,7 +11713,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 1)
@@ -11612,7 +11798,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 6)
@@ -11693,7 +11879,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 6)
@@ -11766,7 +11952,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.elements = loxi.generic_util.unpack_list(reader, common.hello_elem.unpack)
         return obj
@@ -11837,7 +12023,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 0)
@@ -11916,7 +12102,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 10)
@@ -11997,7 +12183,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 10)
@@ -12078,7 +12264,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 11)
@@ -12153,7 +12339,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 11)
@@ -12235,7 +12421,7 @@
         assert(_type == 29)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.command = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -12321,7 +12507,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 12)
@@ -12400,7 +12586,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 9)
@@ -12481,7 +12667,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 9)
@@ -12563,7 +12749,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
@@ -12657,7 +12843,7 @@
         assert(_type == 10)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.buffer_id = reader.read("!L")[0]
         obj.total_len = reader.read("!H")[0]
@@ -12770,7 +12956,7 @@
         assert(_type == 13)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.buffer_id = reader.read("!L")[0]
         obj.in_port = util.unpack_port_no(reader)
@@ -12859,7 +13045,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 13)
@@ -12934,7 +13120,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 13)
@@ -13024,7 +13210,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port_no = util.unpack_port_no(reader)
         reader.skip(4)
@@ -13118,7 +13304,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 7)
@@ -13197,7 +13383,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 4)
@@ -13278,7 +13464,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 4)
@@ -13357,7 +13543,7 @@
         assert(_type == 12)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.reason = reader.read("!B")[0]
         reader.skip(7)
@@ -13433,7 +13619,7 @@
         assert(_type == 23)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port = util.unpack_port_no(reader)
         reader.skip(4)
@@ -13504,7 +13690,7 @@
         assert(_type == 22)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port = util.unpack_port_no(reader)
         reader.skip(4)
@@ -13576,7 +13762,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 9)
@@ -13655,7 +13841,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 5)
@@ -13740,7 +13926,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 5)
@@ -13823,7 +14009,7 @@
         assert(_type == 25)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.role = reader.read("!L")[0]
         reader.skip(4)
@@ -13899,7 +14085,7 @@
         assert(_type == 24)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.role = reader.read("!L")[0]
         reader.skip(4)
@@ -13976,7 +14162,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 11)
@@ -14052,7 +14238,7 @@
         assert(_type == 9)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.flags = reader.read("!H")[0]
         obj.miss_send_len = reader.read("!H")[0]
@@ -14128,7 +14314,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 10)
@@ -14206,7 +14392,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 13)
@@ -14285,7 +14471,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 12)
@@ -14365,7 +14551,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 12)
@@ -14443,7 +14629,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.table_id = reader.read("!B")[0]
         reader.skip(3)
@@ -14520,7 +14706,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 8)
@@ -14599,7 +14785,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 3)
@@ -14674,7 +14860,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 3)
diff --git a/src/python/loxi/of13/meter_band.py b/src/python/loxi/of13/meter_band.py
index 18fc066..8efba54 100644
--- a/src/python/loxi/of13/meter_band.py
+++ b/src/python/loxi/of13/meter_band.py
@@ -51,7 +51,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -100,7 +100,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.rate = reader.read("!L")[0]
         obj.burst_size = reader.read("!L")[0]
         reader.skip(4)
@@ -164,7 +164,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.rate = reader.read("!L")[0]
         obj.burst_size = reader.read("!L")[0]
         obj.prec_level = reader.read("!B")[0]
@@ -232,7 +232,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.rate = reader.read("!L")[0]
         obj.burst_size = reader.read("!L")[0]
         obj.experimenter = reader.read("!L")[0]
diff --git a/src/python/loxi/of14/action.py b/src/python/loxi/of14/action.py
index 098ae7f..21a00b9 100644
--- a/src/python/loxi/of14/action.py
+++ b/src/python/loxi/of14/action.py
@@ -61,7 +61,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -119,7 +119,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -178,7 +178,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -230,7 +230,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -290,7 +290,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -361,7 +361,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -427,7 +427,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -474,7 +474,7 @@
         assert(_type == 12)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -514,7 +514,7 @@
         assert(_type == 11)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -554,7 +554,7 @@
         assert(_type == 16)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -594,7 +594,7 @@
         assert(_type == 24)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -638,7 +638,7 @@
         assert(_type == 22)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.group_id = reader.read("!L")[0]
         return obj
 
@@ -696,7 +696,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         obj.subtype = reader.read("!H")[0]
@@ -746,7 +746,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         _subtype = reader.read("!H")[0]
@@ -801,7 +801,7 @@
         assert(_type == 0)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.port = util.unpack_port_no(reader)
         obj.max_len = reader.read("!H")[0]
         reader.skip(6)
@@ -855,7 +855,7 @@
         assert(_type == 20)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -899,7 +899,7 @@
         assert(_type == 27)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -939,7 +939,7 @@
         assert(_type == 18)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -984,7 +984,7 @@
         assert(_type == 19)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -1033,7 +1033,7 @@
         assert(_type == 26)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -1082,7 +1082,7 @@
         assert(_type == 17)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.ethertype = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -1132,7 +1132,7 @@
         assert(_type == 25)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.field = oxm.oxm.unpack(reader)
         return obj
 
@@ -1180,7 +1180,7 @@
         assert(_type == 15)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.mpls_ttl = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1229,7 +1229,7 @@
         assert(_type == 23)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.nw_ttl = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -1277,7 +1277,7 @@
         assert(_type == 21)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.queue_id = reader.read("!L")[0]
         return obj
 
diff --git a/src/python/loxi/of14/action_id.py b/src/python/loxi/of14/action_id.py
index 4ebcfcd..42c3c6b 100644
--- a/src/python/loxi/of14/action_id.py
+++ b/src/python/loxi/of14/action_id.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -110,7 +110,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         return obj
 
@@ -164,7 +164,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -210,7 +210,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -256,7 +256,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -302,7 +302,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -348,7 +348,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -390,7 +390,7 @@
         assert(_type == 12)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -428,7 +428,7 @@
         assert(_type == 11)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -466,7 +466,7 @@
         assert(_type == 16)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -504,7 +504,7 @@
         assert(_type == 24)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -542,7 +542,7 @@
         assert(_type == 22)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -594,7 +594,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         obj.subtype = reader.read("!H")[0]
@@ -640,7 +640,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
         _subtype = reader.read("!H")[0]
@@ -682,7 +682,7 @@
         assert(_type == 0)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -720,7 +720,7 @@
         assert(_type == 20)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -758,7 +758,7 @@
         assert(_type == 27)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -796,7 +796,7 @@
         assert(_type == 18)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -834,7 +834,7 @@
         assert(_type == 19)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -872,7 +872,7 @@
         assert(_type == 26)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -910,7 +910,7 @@
         assert(_type == 17)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -948,7 +948,7 @@
         assert(_type == 25)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -986,7 +986,7 @@
         assert(_type == 15)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -1024,7 +1024,7 @@
         assert(_type == 23)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -1062,7 +1062,7 @@
         assert(_type == 21)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
diff --git a/src/python/loxi/of14/async_config_prop.py b/src/python/loxi/of14/async_config_prop.py
index f2c1663..63f4d46 100644
--- a/src/python/loxi/of14/async_config_prop.py
+++ b/src/python/loxi/of14/async_config_prop.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -98,7 +98,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -136,7 +136,7 @@
         assert(_type == 65534)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -179,7 +179,7 @@
         assert(_type == 5)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -226,7 +226,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -273,7 +273,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -320,7 +320,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -367,7 +367,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -414,7 +414,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -461,7 +461,7 @@
         assert(_type == 11)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -508,7 +508,7 @@
         assert(_type == 10)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -555,7 +555,7 @@
         assert(_type == 7)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -602,7 +602,7 @@
         assert(_type == 6)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -649,7 +649,7 @@
         assert(_type == 9)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
@@ -696,7 +696,7 @@
         assert(_type == 8)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.mask = reader.read("!L")[0]
         return obj
 
diff --git a/src/python/loxi/of14/bsn_tlv.py b/src/python/loxi/of14/bsn_tlv.py
index f54e7d5..e1e3343 100644
--- a/src/python/loxi/of14/bsn_tlv.py
+++ b/src/python/loxi/of14/bsn_tlv.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -103,7 +103,7 @@
         assert(_type == 44)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -150,7 +150,7 @@
         assert(_type == 43)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -197,7 +197,7 @@
         assert(_type == 42)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -244,7 +244,7 @@
         assert(_type == 53)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!B")[0]
         return obj
 
@@ -291,7 +291,7 @@
         assert(_type == 41)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -338,7 +338,7 @@
         assert(_type == 40)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -385,7 +385,7 @@
         assert(_type == 10)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -406,6 +406,53 @@
 
 bsn_tlv.subtypes[10] = broadcast_query_timeout
 
+class bucket(bsn_tlv):
+    type = 64
+
+    def __init__(self, value=None):
+        if value != None:
+            self.value = value
+        else:
+            self.value = []
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 1
+        packed.append(loxi.generic_util.pack_list(self.value))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = bucket()
+        _type = reader.read("!H")[0]
+        assert(_type == 64)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.value = loxi.generic_util.unpack_list(reader, bsn_tlv.bsn_tlv.unpack)
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.value != other.value: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("bucket {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("value = ");
+                q.pp(self.value)
+            q.breakable()
+        q.text('}')
+
+bsn_tlv.subtypes[64] = bucket
+
 class circuit_id(bsn_tlv):
     type = 14
 
@@ -432,7 +479,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = str(reader.read_all())
         return obj
 
@@ -479,7 +526,7 @@
         assert(_type == 45)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!B")[0]
         return obj
 
@@ -526,7 +573,7 @@
         assert(_type == 22)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!B")[0]
         return obj
 
@@ -573,7 +620,7 @@
         assert(_type == 55)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = str(reader.read_all())
         return obj
 
@@ -620,7 +667,7 @@
         assert(_type == 33)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -667,7 +714,7 @@
         assert(_type == 32)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -714,7 +761,7 @@
         assert(_type == 26)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -761,7 +808,7 @@
         assert(_type == 29)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -808,7 +855,7 @@
         assert(_type == 23)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -855,7 +902,7 @@
         assert(_type == 24)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -902,7 +949,7 @@
         assert(_type == 25)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -949,7 +996,7 @@
         assert(_type == 31)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -991,7 +1038,7 @@
         assert(_type == 7)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -1034,7 +1081,7 @@
         assert(_type == 5)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -1081,7 +1128,7 @@
         assert(_type == 8)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1128,7 +1175,7 @@
         assert(_type == 28)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -1175,7 +1222,7 @@
         assert(_type == 27)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -1222,7 +1269,7 @@
         assert(_type == 58)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1269,7 +1316,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1316,7 +1363,7 @@
         assert(_type == 35)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1363,7 +1410,7 @@
         assert(_type == 60)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1410,7 +1457,7 @@
         assert(_type == 34)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -1457,7 +1504,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -1504,7 +1551,7 @@
         assert(_type == 56)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -1551,7 +1598,7 @@
         assert(_type == 13)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -1572,6 +1619,147 @@
 
 bsn_tlv.subtypes[13] = miss_packets
 
+class mpls_control_word(bsn_tlv):
+    type = 62
+
+    def __init__(self, value=None):
+        if value != None:
+            self.value = value
+        else:
+            self.value = 0
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 1
+        packed.append(struct.pack("!B", self.value))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = mpls_control_word()
+        _type = reader.read("!H")[0]
+        assert(_type == 62)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.value = reader.read("!B")[0]
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.value != other.value: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("mpls_control_word {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("value = ");
+                q.text("%#x" % self.value)
+            q.breakable()
+        q.text('}')
+
+bsn_tlv.subtypes[62] = mpls_control_word
+
+class mpls_label(bsn_tlv):
+    type = 61
+
+    def __init__(self, value=None):
+        if value != None:
+            self.value = value
+        else:
+            self.value = 0
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 1
+        packed.append(struct.pack("!L", self.value))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = mpls_label()
+        _type = reader.read("!H")[0]
+        assert(_type == 61)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.value = reader.read("!L")[0]
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.value != other.value: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("mpls_label {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("value = ");
+                q.text("%#x" % self.value)
+            q.breakable()
+        q.text('}')
+
+bsn_tlv.subtypes[61] = mpls_label
+
+class mpls_sequenced(bsn_tlv):
+    type = 63
+
+    def __init__(self, value=None):
+        if value != None:
+            self.value = value
+        else:
+            self.value = 0
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 1
+        packed.append(struct.pack("!B", self.value))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = mpls_sequenced()
+        _type = reader.read("!H")[0]
+        assert(_type == 63)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.value = reader.read("!B")[0]
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.value != other.value: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("mpls_sequenced {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("value = ");
+                q.text("%#x" % self.value)
+            q.breakable()
+        q.text('}')
+
+bsn_tlv.subtypes[63] = mpls_sequenced
+
 class name(bsn_tlv):
     type = 52
 
@@ -1598,7 +1786,7 @@
         assert(_type == 52)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = str(reader.read_all())
         return obj
 
@@ -1645,7 +1833,7 @@
         assert(_type == 51)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -1692,7 +1880,7 @@
         assert(_type == 50)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -1739,7 +1927,7 @@
         assert(_type == 49)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -1786,7 +1974,7 @@
         assert(_type == 54)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!B")[0]
         return obj
 
@@ -1833,7 +2021,7 @@
         assert(_type == 48)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = list(reader.read('!6B'))
         return obj
 
@@ -1880,7 +2068,7 @@
         assert(_type == 47)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -1927,7 +2115,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = util.unpack_port_no(reader)
         return obj
 
@@ -1974,7 +2162,7 @@
         assert(_type == 57)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2021,7 +2209,7 @@
         assert(_type == 20)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2068,7 +2256,7 @@
         assert(_type == 21)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2120,7 +2308,7 @@
         assert(_type == 59)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.table_id = reader.read("!H")[0]
         obj.key = loxi.generic_util.unpack_list(reader, bsn_tlv.bsn_tlv.unpack)
         return obj
@@ -2172,7 +2360,7 @@
         assert(_type == 12)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -2219,7 +2407,7 @@
         assert(_type == 11)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -2266,7 +2454,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -2313,7 +2501,7 @@
         assert(_type == 30)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2360,7 +2548,7 @@
         assert(_type == 38)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2407,7 +2595,7 @@
         assert(_type == 39)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -2454,7 +2642,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!Q")[0]
         return obj
 
@@ -2501,7 +2689,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2548,7 +2736,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2595,7 +2783,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2642,7 +2830,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2689,7 +2877,7 @@
         assert(_type == 37)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2736,7 +2924,7 @@
         assert(_type == 36)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2783,7 +2971,7 @@
         assert(_type == 9)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
@@ -2830,7 +3018,7 @@
         assert(_type == 6)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!H")[0]
         return obj
 
@@ -2877,7 +3065,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.value = reader.read("!L")[0]
         return obj
 
diff --git a/src/python/loxi/of14/bundle_prop.py b/src/python/loxi/of14/bundle_prop.py
index f5d8b1a..38a4fff 100644
--- a/src/python/loxi/of14/bundle_prop.py
+++ b/src/python/loxi/of14/bundle_prop.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -115,7 +115,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.exp_type = reader.read("!L")[0]
         return obj
diff --git a/src/python/loxi/of14/common.py b/src/python/loxi/of14/common.py
index af39685..5d2e475 100644
--- a/src/python/loxi/of14/common.py
+++ b/src/python/loxi/of14/common.py
@@ -236,6 +236,48 @@
         q.text('}')
 
 
+class bsn_generic_stats_entry(loxi.OFObject):
+
+    def __init__(self, tlvs=None):
+        if tlvs != None:
+            self.tlvs = tlvs
+        else:
+            self.tlvs = []
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 0
+        packed.append(loxi.generic_util.pack_list(self.tlvs))
+        length = sum([len(x) for x in packed])
+        packed[0] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = bsn_generic_stats_entry()
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 2)
+        obj.tlvs = loxi.generic_util.unpack_list(reader, bsn_tlv.bsn_tlv.unpack)
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.tlvs != other.tlvs: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("bsn_generic_stats_entry {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("tlvs = ");
+                q.pp(self.tlvs)
+            q.breakable()
+        q.text('}')
+
+
 class bsn_gentable_bucket_stats_entry(loxi.OFObject):
 
     def __init__(self, checksum=None):
@@ -310,7 +352,7 @@
         obj = bsn_gentable_desc_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.table_id = reader.read("!H")[0]
         obj.name = reader.read("!32s")[0].rstrip("\x00")
         obj.buckets_size = reader.read("!L")[0]
@@ -380,7 +422,7 @@
         obj = bsn_gentable_entry_desc_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         _key_length = reader.read("!H")[0]
         obj.checksum = util.unpack_checksum_128(reader)
         obj.key = loxi.generic_util.unpack_list(reader.slice(_key_length), bsn_tlv.bsn_tlv.unpack)
@@ -440,7 +482,7 @@
         obj = bsn_gentable_entry_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         _key_length = reader.read("!H")[0]
         obj.key = loxi.generic_util.unpack_list(reader.slice(_key_length), bsn_tlv.bsn_tlv.unpack)
         obj.stats = loxi.generic_util.unpack_list(reader, bsn_tlv.bsn_tlv.unpack)
@@ -770,7 +812,7 @@
         obj = bsn_port_counter_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         reader.skip(2)
         obj.port_no = util.unpack_port_no(reader)
         obj.values = loxi.generic_util.unpack_list(reader, common.uint64.unpack)
@@ -908,7 +950,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -953,7 +995,7 @@
         obj = bsn_vlan_counter_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.vlan_vid = reader.read("!H")[0]
         reader.skip(4)
         obj.values = loxi.generic_util.unpack_list(reader, common.uint64.unpack)
@@ -1061,7 +1103,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.flags = reader.read("!L")[0]
         obj.port_no = util.unpack_port_no(reader)
         obj.loopback_port_no = util.unpack_port_no(reader)
@@ -1189,7 +1231,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.port_no = reader.read("!L")[0]
         obj.ingress_tpid = reader.read("!H")[0]
         obj.ingress_vlan_id = reader.read("!H")[0]
@@ -1263,7 +1305,7 @@
         obj = bsn_vrf_counter_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         reader.skip(2)
         obj.vrf = reader.read("!L")[0]
         obj.values = loxi.generic_util.unpack_list(reader, common.uint64.unpack)
@@ -1327,7 +1369,7 @@
         obj = bucket()
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (0 + 2))
+        reader = orig_reader.slice(_len, 2)
         obj.weight = reader.read("!H")[0]
         obj.watch_port = util.unpack_port_no(reader)
         obj.watch_group = reader.read("!L")[0]
@@ -1493,7 +1535,7 @@
         obj = flow_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.table_id = reader.read("!B")[0]
         reader.skip(1)
         obj.duration_sec = reader.read("!L")[0]
@@ -1608,7 +1650,7 @@
         obj = group_desc_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.group_type = reader.read("!B")[0]
         reader.skip(1)
         obj.group_id = reader.read("!L")[0]
@@ -1693,7 +1735,7 @@
         obj = group_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         reader.skip(2)
         obj.group_id = reader.read("!L")[0]
         obj.ref_count = reader.read("!L")[0]
@@ -1775,7 +1817,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -1818,7 +1860,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.bitmaps = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -1866,7 +1908,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_list = loxi.generic_util.unpack_list(reader, oxm.oxm.unpack)
         orig_reader.skip_align()
         return obj
@@ -1965,7 +2007,7 @@
         obj = meter_config()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.flags = reader.read("!H")[0]
         obj.meter_id = reader.read("!L")[0]
         obj.entries = loxi.generic_util.unpack_list(reader, meter_band.meter_band.unpack)
@@ -2127,7 +2169,7 @@
         obj.meter_id = reader.read("!L")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (4 + 2))
+        reader = orig_reader.slice(_len, 6)
         reader.skip(6)
         obj.flow_count = reader.read("!L")[0]
         obj.packet_in_count = reader.read("!Q")[0]
@@ -2212,7 +2254,7 @@
         obj.port = util.unpack_port_no(reader)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (8 + 2))
+        reader = orig_reader.slice(_len, 10)
         reader.skip(6)
         obj.properties = loxi.generic_util.unpack_list(reader, common.queue_prop.unpack)
         return obj
@@ -2291,7 +2333,7 @@
         obj.port_no = util.unpack_port_no(reader)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (4 + 2))
+        reader = orig_reader.slice(_length, 6)
         reader.skip(2)
         obj.hw_addr = list(reader.read('!6B'))
         reader.skip(2)
@@ -2415,7 +2457,7 @@
         obj = port_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         reader.skip(2)
         obj.port_no = util.unpack_port_no(reader)
         obj.duration_sec = reader.read("!L")[0]
@@ -2526,7 +2568,7 @@
         obj.queue_id = reader.read("!L")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (8 + 2))
+        reader = orig_reader.slice(_length, 10)
         reader.skip(6)
         obj.properties = loxi.generic_util.unpack_list(reader, queue_desc_prop.queue_desc_prop.unpack)
         return obj
@@ -2586,7 +2628,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -2644,7 +2686,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.experimenter = reader.read("!L")[0]
         reader.skip(4)
@@ -2697,7 +2739,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.rate = reader.read("!H")[0]
         reader.skip(6)
@@ -2748,7 +2790,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.rate = reader.read("!H")[0]
         reader.skip(6)
@@ -2829,7 +2871,7 @@
         obj = queue_stats_entry()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         reader.skip(6)
         obj.port_no = util.unpack_port_no(reader)
         obj.queue_id = reader.read("!L")[0]
@@ -2913,7 +2955,7 @@
         obj = table_desc()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.table_id = reader.read("!B")[0]
         reader.skip(1)
         obj.config = reader.read("!L")[0]
@@ -2969,7 +3011,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -3012,7 +3054,7 @@
         assert(_type == 6)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.action_ids = loxi.generic_util.unpack_list(reader, action_id.action_id.unpack)
         return obj
 
@@ -3059,7 +3101,7 @@
         assert(_type == 7)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.action_ids = loxi.generic_util.unpack_list(reader, action_id.action_id.unpack)
         return obj
 
@@ -3106,7 +3148,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3153,7 +3195,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3217,7 +3259,7 @@
         assert(_type == 65534)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.subtype = reader.read("!L")[0]
         obj.experimenter_data = str(reader.read_all())
@@ -3288,7 +3330,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.subtype = reader.read("!L")[0]
         obj.experimenter_data = str(reader.read_all())
@@ -3342,7 +3384,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.instruction_ids = loxi.generic_util.unpack_list(reader, instruction_id.instruction_id.unpack)
         return obj
 
@@ -3389,7 +3431,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.instruction_ids = loxi.generic_util.unpack_list(reader, instruction_id.instruction_id.unpack)
         return obj
 
@@ -3436,7 +3478,7 @@
         assert(_type == 8)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3483,7 +3525,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.next_table_ids = loxi.generic_util.unpack_list(reader, common.uint8.unpack)
         return obj
 
@@ -3530,7 +3572,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.next_table_ids = loxi.generic_util.unpack_list(reader, common.uint8.unpack)
         return obj
 
@@ -3577,7 +3619,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.table_ids = loxi.generic_util.unpack_list(reader, common.uint8.unpack)
         return obj
 
@@ -3624,7 +3666,7 @@
         assert(_type == 10)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3671,7 +3713,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.action_ids = loxi.generic_util.unpack_list(reader, action_id.action_id.unpack)
         return obj
 
@@ -3718,7 +3760,7 @@
         assert(_type == 5)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.action_ids = loxi.generic_util.unpack_list(reader, action_id.action_id.unpack)
         return obj
 
@@ -3765,7 +3807,7 @@
         assert(_type == 12)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3812,7 +3854,7 @@
         assert(_type == 13)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.oxm_ids = loxi.generic_util.unpack_list(reader, common.uint32.unpack)
         return obj
 
@@ -3886,7 +3928,7 @@
         obj = table_features()
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (0 + 2))
+        reader = orig_reader.slice(_length, 2)
         obj.table_id = reader.read("!B")[0]
         reader.skip(5)
         obj.name = reader.read("!32s")[0].rstrip("\x00")
@@ -3963,7 +4005,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.flags = reader.read("!L")[0]
         return obj
 
@@ -4021,7 +4063,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.exp_type = reader.read("!L")[0]
         return obj
@@ -4080,7 +4122,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.vacancy_down = reader.read("!B")[0]
         obj.vacancy_up = reader.read("!B")[0]
         obj.vacancy = reader.read("!B")[0]
diff --git a/src/python/loxi/of14/const.py b/src/python/loxi/of14/const.py
index 5fa645e..6813ac2 100644
--- a/src/python/loxi/of14/const.py
+++ b/src/python/loxi/of14/const.py
@@ -1103,6 +1103,7 @@
 OFPPF_AUTONEG = 8192
 OFPPF_PAUSE = 16384
 OFPPF_PAUSE_ASYM = 32768
+OFPPF_BSN_BREAKOUT_CAPABLE = 2147483648
 
 ofp_port_features_map = {
     1: 'OFPPF_10MB_HD',
@@ -1121,6 +1122,7 @@
     8192: 'OFPPF_AUTONEG',
     16384: 'OFPPF_PAUSE',
     32768: 'OFPPF_PAUSE_ASYM',
+    2147483648: 'OFPPF_BSN_BREAKOUT_CAPABLE',
 }
 
 # Identifiers from group ofp_port_mod_failed_code
diff --git a/src/python/loxi/of14/instruction.py b/src/python/loxi/of14/instruction.py
index 5b451fa..cb457cc 100644
--- a/src/python/loxi/of14/instruction.py
+++ b/src/python/loxi/of14/instruction.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -104,7 +104,7 @@
         assert(_type == 4)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.actions = loxi.generic_util.unpack_list(reader, action.action.unpack)
         return obj
@@ -164,7 +164,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -223,7 +223,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -271,7 +271,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -319,7 +319,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -367,7 +367,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -415,7 +415,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -463,7 +463,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -511,7 +511,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -559,7 +559,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -607,7 +607,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -655,7 +655,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -703,7 +703,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -751,7 +751,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -795,7 +795,7 @@
         assert(_type == 5)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         return obj
 
@@ -840,7 +840,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.table_id = reader.read("!B")[0]
         reader.skip(3)
         return obj
@@ -888,7 +888,7 @@
         assert(_type == 6)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.meter_id = reader.read("!L")[0]
         return obj
 
@@ -936,7 +936,7 @@
         assert(_type == 3)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.actions = loxi.generic_util.unpack_list(reader, action.action.unpack)
         return obj
@@ -990,7 +990,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         reader.skip(4)
         obj.metadata = reader.read("!Q")[0]
         obj.metadata_mask = reader.read("!Q")[0]
diff --git a/src/python/loxi/of14/instruction_id.py b/src/python/loxi/of14/instruction_id.py
index aca4976..56b0665 100644
--- a/src/python/loxi/of14/instruction_id.py
+++ b/src/python/loxi/of14/instruction_id.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -98,7 +98,7 @@
         assert(_type == 4)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -148,7 +148,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.experimenter = reader.read("!L")[0]
         return obj
 
@@ -202,7 +202,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         obj.subtype = reader.read("!L")[0]
@@ -248,7 +248,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -294,7 +294,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -340,7 +340,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -386,7 +386,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -432,7 +432,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -478,7 +478,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -524,7 +524,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -570,7 +570,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -616,7 +616,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -662,7 +662,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -708,7 +708,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
         _subtype = reader.read("!L")[0]
@@ -750,7 +750,7 @@
         assert(_type == 5)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -788,7 +788,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -826,7 +826,7 @@
         assert(_type == 6)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -864,7 +864,7 @@
         assert(_type == 3)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -902,7 +902,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
diff --git a/src/python/loxi/of14/message.py b/src/python/loxi/of14/message.py
index 67c8f9a..24c0b44 100644
--- a/src/python/loxi/of14/message.py
+++ b/src/python/loxi/of14/message.py
@@ -69,7 +69,7 @@
         obj.type = reader.read("!B")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -141,7 +141,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.stats_type = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -227,7 +227,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 2)
@@ -323,7 +323,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.stats_type = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -425,7 +425,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 2)
@@ -531,7 +531,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.err_type = reader.read("!H")[0]
         return obj
@@ -599,7 +599,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 15)
@@ -670,7 +670,7 @@
         assert(_type == 27)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.properties = loxi.generic_util.unpack_list(reader, async_config_prop.async_config_prop.unpack)
         return obj
@@ -734,7 +734,7 @@
         assert(_type == 26)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.properties = loxi.generic_util.unpack_list(reader, async_config_prop.async_config_prop.unpack)
         return obj
@@ -798,7 +798,7 @@
         assert(_type == 28)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.properties = loxi.generic_util.unpack_list(reader, async_config_prop.async_config_prop.unpack)
         return obj
@@ -869,7 +869,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 2)
@@ -947,7 +947,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 3)
@@ -1025,7 +1025,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 4)
@@ -1103,7 +1103,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 14)
@@ -1181,7 +1181,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 1)
@@ -1247,7 +1247,7 @@
         assert(_type == 21)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -1301,7 +1301,7 @@
         assert(_type == 20)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -1377,7 +1377,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.experimenter = reader.read("!L")[0]
         obj.subtype = reader.read("!L")[0]
@@ -1457,7 +1457,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1530,7 +1530,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1608,7 +1608,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1675,7 +1675,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1742,7 +1742,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1809,7 +1809,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1881,7 +1881,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -1958,7 +1958,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2030,7 +2030,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2097,7 +2097,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -2180,7 +2180,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2271,7 +2271,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2354,7 +2354,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2450,7 +2450,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2541,7 +2541,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2619,7 +2619,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2702,7 +2702,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2785,7 +2785,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2868,7 +2868,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -2956,7 +2956,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3052,7 +3052,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3140,7 +3140,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3207,7 +3207,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3279,7 +3279,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3356,7 +3356,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3389,6 +3389,192 @@
 
 bsn_header.subtypes[36] = bsn_flow_idle_enable_set_request
 
+class bsn_generic_stats_reply(bsn_stats_reply):
+    version = 5
+    type = 19
+    stats_type = 65535
+    experimenter = 6035143
+    subtype = 16
+
+    def __init__(self, xid=None, flags=None, entries=None):
+        if xid != None:
+            self.xid = xid
+        else:
+            self.xid = None
+        if flags != None:
+            self.flags = flags
+        else:
+            self.flags = 0
+        if entries != None:
+            self.entries = entries
+        else:
+            self.entries = []
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!B", self.version))
+        packed.append(struct.pack("!B", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 2
+        packed.append(struct.pack("!L", self.xid))
+        packed.append(struct.pack("!H", self.stats_type))
+        packed.append(struct.pack("!H", self.flags))
+        packed.append('\x00' * 4)
+        packed.append(struct.pack("!L", self.experimenter))
+        packed.append(struct.pack("!L", self.subtype))
+        packed.append(loxi.generic_util.pack_list(self.entries))
+        length = sum([len(x) for x in packed])
+        packed[2] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = bsn_generic_stats_reply()
+        _version = reader.read("!B")[0]
+        assert(_version == 5)
+        _type = reader.read("!B")[0]
+        assert(_type == 19)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.xid = reader.read("!L")[0]
+        _stats_type = reader.read("!H")[0]
+        assert(_stats_type == 65535)
+        obj.flags = reader.read("!H")[0]
+        reader.skip(4)
+        _experimenter = reader.read("!L")[0]
+        assert(_experimenter == 6035143)
+        _subtype = reader.read("!L")[0]
+        assert(_subtype == 16)
+        obj.entries = loxi.generic_util.unpack_list(reader, common.bsn_generic_stats_entry.unpack)
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.xid != other.xid: return False
+        if self.flags != other.flags: return False
+        if self.entries != other.entries: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("bsn_generic_stats_reply {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("xid = ");
+                if self.xid != None:
+                    q.text("%#x" % self.xid)
+                else:
+                    q.text('None')
+                q.text(","); q.breakable()
+                q.text("flags = ");
+                q.text("%#x" % self.flags)
+                q.text(","); q.breakable()
+                q.text("entries = ");
+                q.pp(self.entries)
+            q.breakable()
+        q.text('}')
+
+bsn_stats_reply.subtypes[16] = bsn_generic_stats_reply
+
+class bsn_generic_stats_request(bsn_stats_request):
+    version = 5
+    type = 18
+    stats_type = 65535
+    experimenter = 6035143
+    subtype = 16
+
+    def __init__(self, xid=None, flags=None, name=None, tlvs=None):
+        if xid != None:
+            self.xid = xid
+        else:
+            self.xid = None
+        if flags != None:
+            self.flags = flags
+        else:
+            self.flags = 0
+        if name != None:
+            self.name = name
+        else:
+            self.name = ""
+        if tlvs != None:
+            self.tlvs = tlvs
+        else:
+            self.tlvs = []
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!B", self.version))
+        packed.append(struct.pack("!B", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 2
+        packed.append(struct.pack("!L", self.xid))
+        packed.append(struct.pack("!H", self.stats_type))
+        packed.append(struct.pack("!H", self.flags))
+        packed.append('\x00' * 4)
+        packed.append(struct.pack("!L", self.experimenter))
+        packed.append(struct.pack("!L", self.subtype))
+        packed.append(struct.pack("!64s", self.name))
+        packed.append(loxi.generic_util.pack_list(self.tlvs))
+        length = sum([len(x) for x in packed])
+        packed[2] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = bsn_generic_stats_request()
+        _version = reader.read("!B")[0]
+        assert(_version == 5)
+        _type = reader.read("!B")[0]
+        assert(_type == 18)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.xid = reader.read("!L")[0]
+        _stats_type = reader.read("!H")[0]
+        assert(_stats_type == 65535)
+        obj.flags = reader.read("!H")[0]
+        reader.skip(4)
+        _experimenter = reader.read("!L")[0]
+        assert(_experimenter == 6035143)
+        _subtype = reader.read("!L")[0]
+        assert(_subtype == 16)
+        obj.name = reader.read("!64s")[0].rstrip("\x00")
+        obj.tlvs = loxi.generic_util.unpack_list(reader, bsn_tlv.bsn_tlv.unpack)
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.xid != other.xid: return False
+        if self.flags != other.flags: return False
+        if self.name != other.name: return False
+        if self.tlvs != other.tlvs: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("bsn_generic_stats_request {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("xid = ");
+                if self.xid != None:
+                    q.text("%#x" % self.xid)
+                else:
+                    q.text('None')
+                q.text(","); q.breakable()
+                q.text("flags = ");
+                q.text("%#x" % self.flags)
+                q.text(","); q.breakable()
+                q.text("name = ");
+                q.pp(self.name)
+                q.text(","); q.breakable()
+                q.text("tlvs = ");
+                q.pp(self.tlvs)
+            q.breakable()
+        q.text('}')
+
+bsn_stats_request.subtypes[16] = bsn_generic_stats_request
+
 class bsn_gentable_bucket_stats_reply(bsn_stats_reply):
     version = 5
     type = 19
@@ -3436,7 +3622,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3524,7 +3710,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3615,7 +3801,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3709,7 +3895,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -3800,7 +3986,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3883,7 +4069,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -3975,7 +4161,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4068,7 +4254,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4153,7 +4339,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4252,7 +4438,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4351,7 +4537,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4450,7 +4636,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4547,7 +4733,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4633,7 +4819,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4716,7 +4902,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -4791,7 +4977,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4858,7 +5044,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -4926,7 +5112,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5000,7 +5186,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5073,7 +5259,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5140,7 +5326,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5220,7 +5406,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -5308,7 +5494,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -5439,7 +5625,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5575,7 +5761,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -5658,7 +5844,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -5738,7 +5924,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5825,7 +6011,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -5923,7 +6109,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6016,7 +6202,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6103,7 +6289,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6201,7 +6387,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6297,7 +6483,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -6385,7 +6571,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -6470,7 +6656,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6547,7 +6733,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6624,7 +6810,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6732,7 +6918,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6836,7 +7022,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -6909,7 +7095,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7002,7 +7188,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7095,7 +7281,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7167,7 +7353,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7247,7 +7433,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -7330,7 +7516,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -7413,7 +7599,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -7496,7 +7682,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -7578,7 +7764,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7657,7 +7843,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7724,7 +7910,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7796,7 +7982,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7873,7 +8059,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -7945,7 +8131,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -8017,7 +8203,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 6035143)
@@ -8097,7 +8283,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -8185,7 +8371,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -8273,7 +8459,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -8361,7 +8547,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 65535)
@@ -8448,7 +8634,7 @@
         assert(_type == 34)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.bundle_id = reader.read("!L")[0]
         reader.skip(2)
@@ -8538,7 +8724,7 @@
         assert(_type == 33)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.bundle_id = reader.read("!L")[0]
         obj.bundle_ctrl_type = reader.read("!H")[0]
@@ -8624,7 +8810,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 17)
@@ -8723,7 +8909,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 0)
@@ -8818,7 +9004,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 0)
@@ -8885,7 +9071,7 @@
         assert(_type == 3)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -8949,7 +9135,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.data = str(reader.read_all())
         return obj
@@ -9025,7 +9211,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 65535)
@@ -9127,7 +9313,7 @@
         assert(_type == 6)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.datapath_id = reader.read("!Q")[0]
         obj.n_buffers = reader.read("!L")[0]
@@ -9212,7 +9398,7 @@
         assert(_type == 5)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -9339,7 +9525,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -9523,7 +9709,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -9711,7 +9897,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -9899,7 +10085,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -10032,7 +10218,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 5)
@@ -10165,7 +10351,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -10353,7 +10539,7 @@
         assert(_type == 14)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.cookie_mask = reader.read("!Q")[0]
@@ -10486,7 +10672,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 16)
@@ -10607,7 +10793,7 @@
         assert(_type == 11)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.cookie = reader.read("!Q")[0]
         obj.priority = reader.read("!H")[0]
@@ -10729,7 +10915,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 1)
@@ -10836,7 +11022,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 1)
@@ -10940,7 +11126,7 @@
         assert(_type == 8)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.flags = reader.read("!H")[0]
         obj.miss_send_len = reader.read("!H")[0]
@@ -11004,7 +11190,7 @@
         assert(_type == 7)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         return obj
 
@@ -11086,7 +11272,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.command = reader.read("!H")[0]
         obj.group_type = reader.read("!B")[0]
@@ -11176,7 +11362,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 0)
@@ -11266,7 +11452,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 2)
@@ -11351,7 +11537,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 7)
@@ -11426,7 +11612,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 7)
@@ -11546,7 +11732,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 8)
@@ -11666,7 +11852,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 8)
@@ -11740,7 +11926,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 6)
@@ -11824,7 +12010,7 @@
         assert(_type == 15)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _command = reader.read("!H")[0]
         assert(_command == 1)
@@ -11909,7 +12095,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 6)
@@ -11990,7 +12176,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 6)
@@ -12063,7 +12249,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.elements = loxi.generic_util.unpack_list(reader, common.hello_elem.unpack)
         return obj
@@ -12134,7 +12320,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 0)
@@ -12213,7 +12399,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 10)
@@ -12294,7 +12480,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 10)
@@ -12375,7 +12561,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 11)
@@ -12450,7 +12636,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 11)
@@ -12532,7 +12718,7 @@
         assert(_type == 29)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.command = reader.read("!H")[0]
         obj.flags = reader.read("!H")[0]
@@ -12618,7 +12804,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 12)
@@ -12697,7 +12883,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 9)
@@ -12778,7 +12964,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 9)
@@ -12860,7 +13046,7 @@
         assert(_type == 4)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _experimenter = reader.read("!L")[0]
         assert(_experimenter == 8992)
@@ -12954,7 +13140,7 @@
         assert(_type == 10)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.buffer_id = reader.read("!L")[0]
         obj.total_len = reader.read("!H")[0]
@@ -13067,7 +13253,7 @@
         assert(_type == 13)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.buffer_id = reader.read("!L")[0]
         obj.in_port = util.unpack_port_no(reader)
@@ -13156,7 +13342,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 13)
@@ -13231,7 +13417,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 13)
@@ -13320,7 +13506,7 @@
         assert(_type == 16)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.port_no = util.unpack_port_no(reader)
         reader.skip(4)
@@ -13413,7 +13599,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 7)
@@ -13492,7 +13678,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 4)
@@ -13573,7 +13759,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 4)
@@ -13652,7 +13838,7 @@
         assert(_type == 12)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.reason = reader.read("!B")[0]
         reader.skip(7)
@@ -13730,7 +13916,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 15)
@@ -13805,7 +13991,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 15)
@@ -13879,7 +14065,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 9)
@@ -13958,7 +14144,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 5)
@@ -14043,7 +14229,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 5)
@@ -14125,7 +14311,7 @@
         assert(_type == 32)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.role = reader.read("!L")[0]
         obj.data = str(reader.read_all())
@@ -14200,7 +14386,7 @@
         assert(_type == 25)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.role = reader.read("!L")[0]
         reader.skip(4)
@@ -14276,7 +14462,7 @@
         assert(_type == 24)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.role = reader.read("!L")[0]
         reader.skip(4)
@@ -14353,7 +14539,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 11)
@@ -14440,7 +14626,7 @@
         assert(_type == 30)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.role = reader.read("!L")[0]
         obj.reason = reader.read("!B")[0]
@@ -14525,7 +14711,7 @@
         assert(_type == 9)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.flags = reader.read("!H")[0]
         obj.miss_send_len = reader.read("!H")[0]
@@ -14601,7 +14787,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 10)
@@ -14680,7 +14866,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 14)
@@ -14755,7 +14941,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 14)
@@ -14829,7 +15015,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 13)
@@ -14908,7 +15094,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 12)
@@ -14988,7 +15174,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 12)
@@ -15071,7 +15257,7 @@
         assert(_type == 17)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.table_id = reader.read("!B")[0]
         reader.skip(3)
@@ -15153,7 +15339,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _err_type = reader.read("!H")[0]
         assert(_err_type == 8)
@@ -15232,7 +15418,7 @@
         assert(_type == 19)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 3)
@@ -15307,7 +15493,7 @@
         assert(_type == 18)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         _stats_type = reader.read("!H")[0]
         assert(_stats_type == 3)
@@ -15385,7 +15571,7 @@
         assert(_type == 31)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.xid = reader.read("!L")[0]
         obj.role = reader.read("!L")[0]
         obj.reason = reader.read("!B")[0]
diff --git a/src/python/loxi/of14/meter_band.py b/src/python/loxi/of14/meter_band.py
index 1b75f02..0f23bf2 100644
--- a/src/python/loxi/of14/meter_band.py
+++ b/src/python/loxi/of14/meter_band.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         return obj
 
     def __eq__(self, other):
@@ -109,7 +109,7 @@
         assert(_type == 1)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.rate = reader.read("!L")[0]
         obj.burst_size = reader.read("!L")[0]
         reader.skip(4)
@@ -173,7 +173,7 @@
         assert(_type == 2)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.rate = reader.read("!L")[0]
         obj.burst_size = reader.read("!L")[0]
         obj.prec_level = reader.read("!B")[0]
@@ -241,7 +241,7 @@
         assert(_type == 65535)
         _len = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_len - (2 + 2))
+        reader = orig_reader.slice(_len, 4)
         obj.rate = reader.read("!L")[0]
         obj.burst_size = reader.read("!L")[0]
         obj.experimenter = reader.read("!L")[0]
diff --git a/src/python/loxi/of14/port_desc_prop.py b/src/python/loxi/of14/port_desc_prop.py
index 3674b98..674b85d 100644
--- a/src/python/loxi/of14/port_desc_prop.py
+++ b/src/python/loxi/of14/port_desc_prop.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -129,7 +129,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         reader.skip(4)
         obj.curr = reader.read("!L")[0]
         obj.advertised = reader.read("!L")[0]
@@ -214,7 +214,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.exp_type = reader.read("!L")[0]
         return obj
@@ -304,7 +304,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         reader.skip(4)
         obj.supported = reader.read("!L")[0]
         obj.tx_min_freq_lmda = reader.read("!L")[0]
diff --git a/src/python/loxi/of14/port_mod_prop.py b/src/python/loxi/of14/port_mod_prop.py
index bf68e3c..2448a96 100644
--- a/src/python/loxi/of14/port_mod_prop.py
+++ b/src/python/loxi/of14/port_mod_prop.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -103,7 +103,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.advertise = reader.read("!L")[0]
         return obj
 
@@ -162,7 +162,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.exp_type = reader.read("!L")[0]
         return obj
@@ -231,7 +231,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.configure = reader.read("!L")[0]
         obj.freq_ldma = reader.read("!L")[0]
         obj.fl_offset = reader.read("!L")[0]
diff --git a/src/python/loxi/of14/port_stats_prop.py b/src/python/loxi/of14/port_stats_prop.py
index b20325f..6d6402c 100644
--- a/src/python/loxi/of14/port_stats_prop.py
+++ b/src/python/loxi/of14/port_stats_prop.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -119,7 +119,7 @@
         assert(_type == 0)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         reader.skip(4)
         obj.rx_frame_err = reader.read("!Q")[0]
         obj.rx_over_err = reader.read("!Q")[0]
@@ -199,7 +199,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.exp_type = reader.read("!L")[0]
         obj.experimenter_data = str(reader.read_all())
@@ -304,7 +304,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         reader.skip(4)
         obj.flags = reader.read("!L")[0]
         obj.tx_freq_lmda = reader.read("!L")[0]
diff --git a/src/python/loxi/of14/queue_desc_prop.py b/src/python/loxi/of14/queue_desc_prop.py
index 5e90246..7382d30 100644
--- a/src/python/loxi/of14/queue_desc_prop.py
+++ b/src/python/loxi/of14/queue_desc_prop.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -115,7 +115,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.exp_type = reader.read("!L")[0]
         return obj
@@ -165,7 +165,7 @@
         assert(_type == 2)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.rate = reader.read("!H")[0]
         reader.skip(2)
         return obj
@@ -214,7 +214,7 @@
         assert(_type == 1)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.rate = reader.read("!H")[0]
         reader.skip(2)
         return obj
diff --git a/src/python/loxi/of14/queue_stats_prop.py b/src/python/loxi/of14/queue_stats_prop.py
index a294436..982a8e3 100644
--- a/src/python/loxi/of14/queue_stats_prop.py
+++ b/src/python/loxi/of14/queue_stats_prop.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -115,7 +115,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.exp_type = reader.read("!L")[0]
         return obj
diff --git a/src/python/loxi/of14/role_prop.py b/src/python/loxi/of14/role_prop.py
index 5baa1e0..f2744a4 100644
--- a/src/python/loxi/of14/role_prop.py
+++ b/src/python/loxi/of14/role_prop.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):
@@ -115,7 +115,7 @@
         assert(_type == 65535)
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         obj.experimenter = reader.read("!L")[0]
         obj.exp_type = reader.read("!L")[0]
         return obj
diff --git a/src/python/loxi/of14/table_mod_prop.py b/src/python/loxi/of14/table_mod_prop.py
index 4d538a1..457f3c2 100644
--- a/src/python/loxi/of14/table_mod_prop.py
+++ b/src/python/loxi/of14/table_mod_prop.py
@@ -60,7 +60,7 @@
         obj.type = reader.read("!H")[0]
         _length = reader.read("!H")[0]
         orig_reader = reader
-        reader = orig_reader.slice(_length - (2 + 2))
+        reader = orig_reader.slice(_length, 4)
         return obj
 
     def __eq__(self, other):