Commit 8fad9c39 authored by Linus Lüssing's avatar Linus Lüssing Committed by David S. Miller

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

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 bd4265fe ("bridge: Only flood unregistered groups
to routers") did for IPv4, let's do the same for IPv6 with the same
reasoning.
Signed-off-by: default avatarLinus Lüssing <linus.luessing@web.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f2127810
...@@ -1491,8 +1491,14 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br, ...@@ -1491,8 +1491,14 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
* - MLD has always Router Alert hop-by-hop option * - MLD has always Router Alert hop-by-hop option
* - But we do not support jumbrograms. * - But we do not support jumbrograms.
*/ */
if (ip6h->version != 6 || if (ip6h->version != 6)
ip6h->nexthdr != IPPROTO_HOPOPTS || 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) ip6h->payload_len == 0)
return 0; return 0;
......
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