[Bridge] [PATCH] bridge: Cannot communicate with brX when its MAC address is changed

Koki Sanagi sanagi.koki at jp.fujitsu.com
Wed Nov 30 08:31:18 UTC 2011

When the MAC address of a bridge interface is changed, it cannot communicate
with others. Because Whether or not a packet should be transferred to bridge
interface depends on whether or not dst of a packet is in fdb and is_local=y.
If we change MAC address of a bridge interface, it isn't in fdb.

This patch adds an condition that dst of a packet matches MAC address of
a bridge interface to the conventional condition.

Signed-off-by: Koki Sanagi <sanagi.koki at jp.fujitsu.com>
 net/bridge/br_input.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 5a31731..4e5c862 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -94,7 +94,8 @@ int br_handle_frame_finish(struct sk_buff *skb)
 			skb2 = skb;
-	} else if ((dst = __br_fdb_get(br, dest)) && dst->is_local) {
+	} else if ((dst = __br_fdb_get(br, dest) && dst->is_local) ||
+		   !compare_ether_addr(p->br->dev->dev_addr, dest)) {
 		skb2 = skb;
 		/* Do not forward the packet since it's local. */
 		skb = NULL;

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