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[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 <shemminger@linux-foundation.org>
Acked-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2007-08-30 22:15:35 -07:00 committed by David S. Miller
parent b91ddd8437
commit df1c0b8468
2 changed files with 6 additions and 2 deletions
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5
net/bridge/br_fdb.c
View File

@ -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 */

3
net/bridge/br_input.c
View File

@ -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 */
}