From: Stephen Hemminger Date: Fri, 31 Aug 2007 05:15:35 +0000 (-0700) Subject: [BRIDGE]: Packets leaking out of disabled/blocked ports. X-Git-Tag: v2.6.23-rc5~37^2~4 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df1c0b8468b34628ed12b103804a4576cd9af8bb;p=linux-2.6 [BRIDGE]: Packets leaking out of disabled/blocked ports. This patch fixes some packet leakage in bridge. The bridging code was allowing forward table entries to be generated even if a device was being blocked. The fix is to not add forwarding database entries unless the port is active. The bug arose as part of the conversion to processing STP frames through normal receive path (in 2.6.17). Signed-off-by: Stephen Hemminger Acked-by: John W. Linville Signed-off-by: David S. Miller --- diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index 69b70977f0..eb57502bb2 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -384,6 +384,11 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, if (hold_time(br) == 0) return; + /* ignore packets unless we are using this port */ + if (!(source->state == BR_STATE_LEARNING || + source->state == BR_STATE_FORWARDING)) + return; + fdb = fdb_find(head, addr); if (likely(fdb)) { /* attempt to update an entry for a local interface */ diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index 5c18595b76..6f468fc335 100644 --- a/net/bridge/br_input.c +++ b/net/bridge/br_input.c @@ -101,9 +101,8 @@ static int br_handle_local_finish(struct sk_buff *skb) { struct net_bridge_port *p = rcu_dereference(skb->dev->br_port); - if (p && p->state != BR_STATE_DISABLED) + if (p) br_fdb_update(p->br, p, eth_hdr(skb)->h_source); - return 0; /* process further */ }