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#
# Copyright 2017 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import structlog
from twisted.internet.defer import inlineCallbacks, returnValue
import loxi.of13 as ofp
from converter import to_loxi, pb2dict, to_grpc
log = structlog.get_logger()
class OpenFlowProtocolError(Exception): pass
class OpenFlowProtocolHandler(object):
ofp_version = [4] # OFAgent supported versions
MAX_METER_IDS = 4294967295
MAX_METER_BANDS = 255
MAX_METER_COLORS = 255
def __init__(self, datapath_id, device_id, agent, cxn, rpc):
"""
The upper half of the OpenFlow protocol, focusing on message
exchanges.
:param agent: Reference to the Agent() instance, can be used to
indicate critical errors to break the connection.
:param cxn: The lower level message serdes part of the OF protocol.
:param rpc: The application level stub on which RPC calls
are made as result of processing incoming OpenFlow request messages.
"""
self.datapath_id = datapath_id
self.device_id = device_id
self.agent = agent
self.cxn = cxn
self.rpc = rpc
self.role = None
@inlineCallbacks
def start(self):
"""A new call is made after a fresh reconnect"""
log.debug('starting')
try:
support = False
# send initial hello message
self.cxn.send(ofp.message.hello(elements=[ofp.common.hello_elem_versionbitmap(
bitmaps = [ofp.common.hello_elem_bitmap(self.ofp_version)])]))
# expect to receive a hello message
msg = yield self.cxn.recv_class(ofp.message.hello)
# supports only ofp_versions till 31 and single bitmap.
if msg:
support = ofp.util.verify_version_support(msg,self.ofp_version)
if not support:
self.cxn.send(ofp.message.hello_failed_error_msg(
xid=msg.xid, code=ofp.OFPHFC_INCOMPATIBLE,
data='i support only 1.3'))
log.error('peer-do-not-support-OpenFlow-version',self.ofp_version)
while support:
req = yield self.cxn.recv_any()
handler = self.main_handlers.get(req.type, None)
if handler:
handler(self, req)
else:
log.error('cannot-handle',
request=req, xid=req.xid, type=req.type)
except Exception, e:
log.exception('exception', e=e)
log.info('started')
returnValue(self)
def stop(self):
log.debug('stopping')
pass # nothing to do yet
log.info('stopped')
def handle_echo_request(self, req):
self.cxn.send(ofp.message.echo_reply(xid=req.xid))
@inlineCallbacks
def handle_feature_request(self, req):
device_info = yield self.rpc.get_device_info(self.device_id)
kw = pb2dict(device_info.switch_features)
self.cxn.send(ofp.message.features_reply(
xid=req.xid,
datapath_id=self.datapath_id,
**kw))
def handle_stats_request(self, req):
handler = self.stats_handlers.get(req.stats_type, None)
if handler:
handler(self, req)
else:
raise OpenFlowProtocolError(
'Cannot handle stats request type "{}"'.format(req.stats_type))
def handle_barrier_request(self, req):
# not really doing barrier yet, but we respond
# see https://jira.opencord.org/browse/CORD-823
self.cxn.send(ofp.message.barrier_reply(xid=req.xid))
def handle_experimenter_request(self, req):
raise NotImplementedError()
def handle_flow_mod_request(self, req):
if self.role == ofp.OFPCR_ROLE_MASTER or self.role == ofp.OFPCR_ROLE_EQUAL:
try:
grpc_req = to_grpc(req)
except Exception, e:
log.exception('failed-to-convert', e=e)
else:
return self.rpc.update_flow_table(self.device_id, grpc_req)
elif self.role == ofp.OFPCR_ROLE_SLAVE:
self.cxn.send(ofp.message.bad_request_error_msg(code=ofp.OFPBRC_IS_SLAVE))
def handle_meter_mod_request(self, req):
if self.role == ofp.OFPCR_ROLE_MASTER or self.role == ofp.OFPCR_ROLE_EQUAL:
try:
grpc_req = to_grpc(req)
except Exception, e:
log.exception('failed-to-convert-meter-mod-request', e=e)
else:
return self.rpc.update_meter_mod_table(self.device_id, grpc_req)
elif self.role == ofp.OFPCR_ROLE_SLAVE:
self.cxn.send(ofp.message.bad_request_error_msg(code=ofp.OFPBRC_IS_SLAVE))
@inlineCallbacks
def handle_meter_stats_request(self, req):
try:
meters = yield self.rpc.list_meters(self.device_id)
self.cxn.send(ofp.message.meter_stats_reply(
xid=req.xid, entries=[to_loxi(m.stats) for m in meters]))
except Exception, e:
log.exception("failed-meter-stats-request", req=req, e=e)
def handle_get_async_request(self, req):
raise NotImplementedError()
def handle_get_config_request(self, req):
self.cxn.send(ofp.message.get_config_reply(
xid=req.xid,
miss_send_len=ofp.OFPCML_NO_BUFFER
))
@inlineCallbacks
def handle_group_mod_request(self, req):
if self.role == ofp.OFPCR_ROLE_MASTER or self.role == ofp.OFPCR_ROLE_EQUAL:
yield self.rpc.update_group_table(self.device_id, to_grpc(req))
elif self.role == ofp.OFPCR_ROLE_SLAVE:
self.cxn.send(ofp.message.bad_request_error_msg(code=ofp.OFPBRC_IS_SLAVE))
def handle_role_request(self, req):
if req.role == ofp.OFPCR_ROLE_MASTER or req.role == ofp.OFPCR_ROLE_SLAVE:
if self.agent.generation_is_defined and (
((req.generation_id - self.agent.cached_generation_id) & 0xffffffffffffffff) if abs(
req.generation_id - self.agent.cached_generation_id) > 0x7fffffffffffffff else (
req.generation_id - self.agent.cached_generation_id)) < 0:
self.cxn.send(ofp.message.bad_request_error_msg(code=ofp.OFPRRFC_STALE))
else:
self.agent.generation_is_defined = True
self.agent.cached_generation_id = req.generation_id
self.role = req.role
self.cxn.send(ofp.message.role_reply(
xid=req.xid, role=req.role, generation_id=req.generation_id))
elif req.role == ofp.OFPCR_ROLE_EQUAL:
self.role = req.role
self.cxn.send(ofp.message.role_reply(
xid=req.xid, role=req.role))
def handle_packet_out_request(self, req):
if self.role == ofp.OFPCR_ROLE_MASTER or self.role == ofp.OFPCR_ROLE_EQUAL:
self.rpc.send_packet_out(self.device_id, to_grpc(req))
elif self.role == ofp.OFPCR_ROLE_SLAVE:
self.cxn.send(ofp.message.bad_request_error_msg(code=ofp.OFPBRC_IS_SLAVE))
def handle_set_config_request(self, req):
# Handle set config appropriately
# https://jira.opencord.org/browse/CORD-826
pass
@inlineCallbacks
def handle_port_mod_request(self, req):
if self.role == ofp.OFPCR_ROLE_MASTER or self.role == ofp.OFPCR_ROLE_EQUAL:
port = yield self.rpc.get_port(self.device_id, str(req.port_no))
if port.ofp_port.config & ofp.OFPPC_PORT_DOWN != \
req.config & ofp.OFPPC_PORT_DOWN:
if req.config & ofp.OFPPC_PORT_DOWN:
self.rpc.disable_port(self.device_id, port.id)
else:
self.rpc.enable_port(self.device_id, port.id)
elif self.role == ofp.OFPCR_ROLE_SLAVE:
self.cxn.send(ofp.message.bad_request_error_msg(code=ofp.OFPBRC_IS_SLAVE))
def handle_table_mod_request(self, req):
raise NotImplementedError()
def handle_queue_get_config_request(self, req):
raise NotImplementedError()
def handle_set_async_request(self, req):
raise NotImplementedError()
def handle_aggregate_request(self, req):
raise NotImplementedError
@inlineCallbacks
def handle_device_description_request(self, req):
device_info = yield self.rpc.get_device_info(self.device_id)
kw = pb2dict(device_info.desc)
self.cxn.send(ofp.message.desc_stats_reply(xid=req.xid, **kw))
def handle_experimenter_stats_request(self, req):
raise NotImplementedError()
@inlineCallbacks
def handle_flow_stats_request(self, req):
try:
flow_stats = yield self.rpc.list_flows(self.device_id)
self.cxn.send(ofp.message.flow_stats_reply(
xid=req.xid, entries=[to_loxi(f) for f in flow_stats]))
except Exception, e:
log.exception('failed-flow-stats-request', req=req)
@inlineCallbacks
def handle_group_stats_request(self, req):
group_stats = yield self.rpc.list_groups(self.device_id)
self.cxn.send(ofp.message.group_stats_reply(
xid=req.xid, entries=[to_loxi(g.stats) for g in group_stats]))
@inlineCallbacks
def handle_group_descriptor_request(self, req):
group_stats = yield self.rpc.list_groups(self.device_id)
self.cxn.send(ofp.message.group_desc_stats_reply(
xid=req.xid, entries=[to_loxi(g.desc) for g in group_stats]))
def handle_group_features_request(self, req):
raise NotImplementedError()
def handle_meter_config_request(self, req):
raise NotImplementedError()
def handle_meter_features_request(self, req):
feature = ofp.meter_features(max_meter=OpenFlowProtocolHandler.MAX_METER_IDS,
band_types=ofp.OFPMBT_DROP,
capabilities=ofp.OFPMF_KBPS,
max_bands=OpenFlowProtocolHandler.MAX_METER_BANDS,
max_color=OpenFlowProtocolHandler.MAX_METER_COLORS)
self.cxn.send(ofp.message.meter_features_stats_reply(xid=req.xid, flags=None,
features=feature))
@inlineCallbacks
def handle_port_stats_request(self, req):
try:
ports = yield self.rpc.list_ports(self.device_id)
port_stats = [to_loxi(p.ofp_port_stats) for p in ports]
of_message = ofp.message.port_stats_reply(
xid=req.xid,entries=port_stats)
self.cxn.send(of_message)
except:
log.exception('failed-port_stats-request', req=req)
@inlineCallbacks
def handle_port_desc_request(self, req):
port_list = yield self.rpc.get_port_list(self.device_id)
self.cxn.send(ofp.message.port_desc_stats_reply(
xid=req.xid,
#flags=None,
entries=[to_loxi(port.ofp_port) for port in port_list]
))
def handle_queue_stats_request(self, req):
raise NotImplementedError()
def handle_table_stats_request(self, req):
table_stats = [] # see https://jira.opencord.org/browse/CORD-825
self.cxn.send(ofp.message.table_stats_reply(
xid=req.xid, entries=table_stats))
def handle_table_features_request(self, req):
raise NotImplementedError()
stats_handlers = {
ofp.OFPST_AGGREGATE: handle_aggregate_request,
ofp.OFPST_DESC: handle_device_description_request,
ofp.OFPST_EXPERIMENTER: handle_experimenter_stats_request,
ofp.OFPST_FLOW: handle_flow_stats_request,
ofp.OFPST_GROUP: handle_group_stats_request,
ofp.OFPST_GROUP_DESC: handle_group_descriptor_request,
ofp.OFPST_GROUP_FEATURES: handle_group_features_request,
ofp.OFPST_METER: handle_meter_stats_request,
ofp.OFPST_METER_CONFIG: handle_meter_config_request,
ofp.OFPST_METER_FEATURES: handle_meter_features_request,
ofp.OFPST_PORT: handle_port_stats_request,
ofp.OFPST_PORT_DESC: handle_port_desc_request,
ofp.OFPST_QUEUE: handle_queue_stats_request,
ofp.OFPST_TABLE: handle_table_stats_request,
ofp.OFPST_TABLE_FEATURES: handle_table_features_request
}
main_handlers = {
ofp.OFPT_BARRIER_REQUEST: handle_barrier_request,
ofp.OFPT_ECHO_REQUEST: handle_echo_request,
ofp.OFPT_FEATURES_REQUEST: handle_feature_request,
ofp.OFPT_EXPERIMENTER: handle_experimenter_request,
ofp.OFPT_FLOW_MOD: handle_flow_mod_request,
ofp.OFPT_GET_ASYNC_REQUEST: handle_get_async_request,
ofp.OFPT_GET_CONFIG_REQUEST: handle_get_config_request,
ofp.OFPT_GROUP_MOD: handle_group_mod_request,
ofp.OFPT_METER_MOD: handle_meter_mod_request,
ofp.OFPT_PACKET_OUT: handle_packet_out_request,
ofp.OFPT_PORT_MOD: handle_port_mod_request,
ofp.OFPT_QUEUE_GET_CONFIG_REQUEST: handle_queue_get_config_request,
ofp.OFPT_ROLE_REQUEST: handle_role_request,
ofp.OFPT_SET_ASYNC: handle_set_async_request,
ofp.OFPT_SET_CONFIG: handle_set_config_request,
ofp.OFPT_STATS_REQUEST: handle_stats_request,
ofp.OFPT_TABLE_MOD: handle_table_mod_request,
}
def forward_packet_in(self, ofp_packet_in):
if self.role == ofp.OFPCR_ROLE_MASTER or self.role == ofp.OFPCR_ROLE_EQUAL:
log.info('sending-packet-in', ofp_packet_in=ofp_packet_in)
self.cxn.send(to_loxi(ofp_packet_in))
def forward_port_status(self, ofp_port_status):
self.cxn.send(to_loxi(ofp_port_status))