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bridge: Always flood broadcast packets

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As is_multicast_ether_addr returns true on broadcast packets as
well, we need to explicitly exclude broadcast packets so that
they're always flooded.  This wasn't an issue before as broadcast
packets were considered to be an unregistered multicast group,
which were always flooded.  However, as we now only flood such
packets to router ports, this is no longer acceptable.

Reported-by: Michael Guntsche <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Herbert Xu 2011-07-05 13:58:33 +00:00 • committed by David S. Miller
commit 44661462ee
2 changed files with 7 additions and 3 deletions
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4
net/bridge/br_device.c
View file

@ -49,7 +49,9 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
skb_pull(skb, ETH_HLEN);
rcu_read_lock();
if (is_multicast_ether_addr(dest)) {
if (is_broadcast_ether_addr(dest))
br_flood_deliver(br, skb);
else if (is_multicast_ether_addr(dest)) {
if (unlikely(netpoll_tx_running(dev))) {
br_flood_deliver(br, skb);
goto out;

6
net/bridge/br_input.c
View file

@ -60,7 +60,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
br = p->br;
br_fdb_update(br, p, eth_hdr(skb)->h_source);
if (is_multicast_ether_addr(dest) &&
if (!is_broadcast_ether_addr(dest) && is_multicast_ether_addr(dest) &&
br_multicast_rcv(br, p, skb))
goto drop;
@ -77,7 +77,9 @@ int br_handle_frame_finish(struct sk_buff *skb)
dst = NULL;
if (is_multicast_ether_addr(dest)) {
if (is_broadcast_ether_addr(dest))
skb2 = skb;
else if (is_multicast_ether_addr(dest)) {
mdst = br_mdb_get(br, skb);
if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) {
if ((mdst && mdst->mglist) ||