path: root/net
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authorLinus Lüssing <>2011-02-17 08:17:52 +0000
committerDavid S. Miller <>2011-02-22 10:07:29 -0800
commitfe29ec41aaa51902aebd63658dfb04fe6fea8be5 (patch)
treec9325f8cb76331c307b39d1348f8d668dfdfbc58 /net
parent36cff5a10c6b003fa2d0464848d5664b2bf723e0 (diff)
bridge: Use IPv6 link-local address for multicast listener queries
Currently the bridge multicast snooping feature periodically issues IPv6 general multicast listener queries to sense the absence of a listener. For this, it uses :: as its source address - however RFC 2710 requires: "To be valid, the Query message MUST come from a link-local IPv6 Source Address". Current Linux kernel versions seem to follow this requirement and ignore our bogus MLD queries. With this commit a link local address from the bridge interface is being used to issue the MLD query, resulting in other Linux devices which are multicast listeners in the network to respond with a MLD response (which was not the case before). Signed-off-by: Linus Lüssing <> Signed-off-by: David S. Miller <>
Diffstat (limited to 'net')
1 files changed, 2 insertions, 1 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index c1f24e4d0820..030a002ff8ee 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -445,7 +445,8 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
ip6h->payload_len = htons(8 + sizeof(*mldq));
ip6h->nexthdr = IPPROTO_HOPOPTS;
ip6h->hop_limit = 1;
- ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0);
+ ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
+ &ip6h->saddr);
ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);