Nest: VRF support for neighbor cache and olock code

Actually much simpler than expected.

nest/locks.c

@@ -45,6 +45,7 @@ olock_same(struct object_lock *x, struct object_lock *y)
   return
     x->type == y->type &&
     x->iface == y->iface &&
+    x->vrf == y->vrf &&
     x->port == y->port &&
     x->inst == y->inst &&
     ipa_equal(x->addr, y->addr);

nest/locks.h

@@ -30,6 +30,7 @@ struct object_lock {
   uint port;		/* ... port number */
   uint inst;		/* ... instance ID */
   struct iface *iface;	/* ... interface */
+  struct iface *vrf;	/* ... or VRF (if iface is unknown) */
   void (*hook)(struct object_lock *);	/* Called when the lock succeeds */
   void *data;		/* User data */
   /* ... internal to lock manager, don't touch ... */

nest/neighbor.c

@@ -30,7 +30,8 @@
  * when the protocol has explicitly requested it via the %NEF_STICKY
  * flag because it wishes to be notified when the node will again become
  * a neighbor. Such entries are enqueued in a special list which is walked
- * whenever an interface changes its state to up.
+ * whenever an interface changes its state to up. Neighbor entry VRF
+ * association is implied by respective protocol.
  *
  * When a neighbor event occurs (a neighbor gets disconnected or a sticky
  * inactive neighbor becomes connected), the protocol hook neigh_notify()
@@ -152,8 +153,9 @@ neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags)
     }
   else
     WALK_LIST(i, iface_list)
-      if ((scope = if_connected(a, i, &addr)) >= 0)
-	{
+      if ((!p->vrf || p->vrf == i->master) &&
+	  ((scope = if_connected(a, i, &addr)) >= 0))
+        {
 	  ifa = i;
 	  break;
 	}

proto/bgp/bgp.c

@@ -1181,6 +1181,7 @@ bgp_start(struct proto *P)
   lock->addr = p->cf->remote_ip;
   lock->port = p->cf->remote_port;
   lock->iface = p->cf->iface;
+  lock->vrf = p->cf->iface ? NULL : p->p.vrf;
   lock->type = OBJLOCK_TCP;
   lock->hook = bgp_start_locked;
   lock->data = p;

proto/radv/radv.c

@@ -321,7 +321,6 @@ radv_iface_new(struct radv_proto *p, struct iface *iface, struct radv_iface_conf
   ifa->timer = tm;
 
   struct object_lock *lock = olock_new(pool);
-  lock->addr = IPA_NONE;
   lock->type = OBJLOCK_IP;
   lock->port = ICMPV6_PROTO;
   lock->iface = iface;