[TIPC]: Links now validate destination node specified by incoming mes…

…sages. This fix prevents link flopping and name table inconsistency problems arising when a node is assigned a different <Z.C.N> value than it used previously. (Changing the <Z.C.N> value causes other nodes to have two link endpoints sending to the same MAC address using two different destination <Z.C.N> values, requiring the receiving node to filter out the unwanted messages.) Signed-off-by: Allan Stephens <[email protected]> Signed-off-by: Per Liden <[email protected]> Signed-off-by: David S. Miller <[email protected]>
akeromi · Jun 26, 2006 · 2600824 · 2600824
1 parent 9688243
commit 2600824
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/net/tipc/link.c b/net/tipc/link.c
@@ -1720,6 +1720,11 @@ void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *tb_ptr)
 			link_recv_non_seq(buf);
 			continue;
 		}
+
+		if (unlikely(!msg_short(msg) &&
+			     (msg_destnode(msg) != tipc_own_addr)))
+			goto cont;
+
 		n_ptr = tipc_node_find(msg_prevnode(msg));
 		if (unlikely(!n_ptr))
 			goto cont;