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bridge: Only flood unregistered groups to routers

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The bridge currently floods packets to groups that we have never
seen before to all ports.  This is not required by RFC4541 and
in fact it is not desirable in environment where traffic to
unregistered group is always present.

This patch changes the behaviour so that we only send traffic
to unregistered groups to ports marked as routers.

The user can always force flooding behaviour to any given port
by marking it as a router.

Note that this change does not apply to traffic to 224.0.0.X
as traffic to those groups must always be flooded to all ports.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2011-06-23 02:39:12 +00:00 committed by David S. Miller
parent b997d79a91
commit bd4265fe36
1 changed files with 4 additions and 1 deletions
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5
net/bridge/br_multicast.c
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@ -1379,8 +1379,11 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
return -EINVAL;
if (iph->protocol != IPPROTO_IGMP)
if (iph->protocol != IPPROTO_IGMP) {
if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
return 0;
}
len = ntohs(iph->tot_len);
if (skb->len < len || len < ip_hdrlen(skb))