Allow providers to override glean behaviour
and update glean address on local interface MAC change

Change-Id: I530826d60c7e9db2b0fa2d45754139d82c5ea807
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
diff --git a/src/vnet/ip/ip6_neighbor.c b/src/vnet/ip/ip6_neighbor.c
index 82b402f..4c1b1bb 100644
--- a/src/vnet/ip/ip6_neighbor.c
+++ b/src/vnet/ip/ip6_neighbor.c
@@ -566,8 +566,10 @@
 
   switch (adj->lookup_next_index)
     {
-    case IP_LOOKUP_NEXT_ARP:
     case IP_LOOKUP_NEXT_GLEAN:
+      adj_glean_update_rewrite (ai);
+      break;
+    case IP_LOOKUP_NEXT_ARP:
       if (NULL != nbr)
 	{
 	  adj_nbr_walk_nh6 (sw_if_index, &nbr->key.ip6_address,
@@ -4256,6 +4258,7 @@
 {
   ip6_neighbor_main_t *nm = &ip6_neighbor_main;
   ip6_neighbor_t *n;
+  adj_index_t ai;
 
   /* *INDENT-OFF* */
   pool_foreach (n, nm->neighbor_pool,
@@ -4268,6 +4271,11 @@
       }
   }));
   /* *INDENT-ON* */
+
+  ai = adj_glean_get (FIB_PROTOCOL_IP6, sw_if_index);
+
+  if (ADJ_INDEX_INVALID != ai)
+    adj_glean_update_rewrite (ai);
 }
 
 void