commit b11f3b54c842117e22e2f5cf1561ea34eee8dfcc
author Timo Teräs <timo.teras@iki.fi> Mon Nov 02 16:50:07 2015 +0200
committer Donald Sharp <sharpd@cumulusnetworks.com> Tue Dec 08 14:12:10 2015 -0500
tree c31f9893baa2a05db24ea72d1370fb6b11f59c20
parent 7eb6136b2732d4782360f9f376336c6d4f667ff0

zebra: implement per-route mtu handling

This commits allow overriding MTU using netlink attributes on
per-route basis. This is useful for routing protocols that can
advertice prefix specific MTUs between routers (e.g. NHRP).

Signed-off-by: Timo Teräs <timo.teras@iki.fi>

zebra/zserv.c

diff --git a/zebra/zserv.c b/zebra/zserv.c
index e26c8ca..7a75ed4 100644
--- a/zebra/zserv.c
+++ b/zebra/zserv.c
@@ -455,6 +455,8 @@
       stream_putc (s, rib->distance);
       SET_FLAG (zapi_flags, ZAPI_MESSAGE_METRIC);
       stream_putl (s, rib->metric);
+      SET_FLAG (zapi_flags, ZAPI_MESSAGE_MTU);
+      stream_putl (s, rib->mtu);
     }
   
   /* write real message flags value */
@@ -903,6 +905,9 @@
   if (CHECK_FLAG (message, ZAPI_MESSAGE_METRIC))
     rib->metric = stream_getl (s);
     
+  if (CHECK_FLAG (message, ZAPI_MESSAGE_MTU))
+    rib->mtu = stream_getl (s);
+
   /* Table */
   rib->table=zebrad.rtm_table_default;
   rib_add_ipv4_multipath (&p, rib, safi);
@@ -1092,15 +1097,20 @@
     api.metric = stream_getl (s);
   else
     api.metric = 0;
+
+  if (CHECK_FLAG (api.message, ZAPI_MESSAGE_MTU))
+    api.mtu = stream_getl (s);
+  else
+    api.mtu = 0;
     
   if (IN6_IS_ADDR_UNSPECIFIED (&nexthop))
     rib_add_ipv6 (api.type, api.flags, &p, NULL, ifindex,
                   vrf_id, zebrad.rtm_table_default, api.metric,
-                  api.distance, api.safi);
+                  api.mtu, api.distance, api.safi);
   else
     rib_add_ipv6 (api.type, api.flags, &p, &nexthop, ifindex,
                   vrf_id, zebrad.rtm_table_default, api.metric,
-                  api.distance, api.safi);
+                  api.mtu, api.distance, api.safi);
   return 0;
 }