[BRIDGE]: Allow multiple interfaces with same address (necessary for VLAN's).

net/bridge/br_fdb.c

@@ -277,19 +277,19 @@ int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 		if (!memcmp(fdb->addr.addr, addr, ETH_ALEN)) {
 			/* attempt to update an entry for a local interface */
 			if (unlikely(fdb->is_local)) {
-				if (is_local) 
-					printk(KERN_INFO "%s: attempt to add"
-					       " interface with same source address.\n",
-					       source->dev->name);
-				else if (net_ratelimit()) 
-					printk(KERN_WARNING "%s: received packet with "
-					       " own address as source address\n",
-					       source->dev->name);
-				ret = -EEXIST;
+				/* it is okay to have multiple ports with same 
+				 * address, just don't allow to be spoofed.
+				 */
+				if (!is_local) {
+					if (net_ratelimit()) 
+						printk(KERN_WARNING "%s: received packet with "
+						       " own address as source address\n",
+						       source->dev->name);
+					ret = -EEXIST;
+				}
 				goto out;
 			}
 
-
 			if (likely(!fdb->is_static || is_local)) {
 				/* move to end of age list */
 				list_del(&fdb->age_list);