From df1c0b8468b34628ed12b103804a4576cd9af8bb Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Thu, 30 Aug 2007 22:15:35 -0700 Subject: [PATCH] [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 --- net/bridge/br_fdb.c | 5 +++++ net/bridge/br_input.c | 3 +-- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index 69b70977f00..eb57502bb26 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 5c18595b761..6f468fc3357 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 */ } -- 2.20.1