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bridge: prevent flooding IPv6 packets that do not have a listener

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Currently if there is no listener for a certain group then IPv6 packets
for that group are flooded on all ports, even though there might be no
host and router interested in it on a port.

With this commit they are only forwarded to ports with a multicast
router.

Just like commit bd4265fe36 ("bridge: Only flood unregistered groups
to routers") did for IPv4, let's do the same for IPv6 with the same
reasoning.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Linus Lüssing 2013-09-04 02:13:38 +02:00 committed by David S. Miller
parent f212781082
commit 8fad9c39f3
1 changed files with 8 additions and 2 deletions
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10
net/bridge/br_multicast.c
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@ -1491,8 +1491,14 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
* - MLD has always Router Alert hop-by-hop option
* - But we do not support jumbrograms.
*/
if (ip6h->version != 6 ||
ip6h->nexthdr != IPPROTO_HOPOPTS ||
if (ip6h->version != 6)
return 0;
/* Prevent flooding this packet if there is no listener present */
if (ipv6_is_transient_multicast(&ip6h->daddr))
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
ip6h->payload_len == 0)
return 0;