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| author | Fernando Luis Vázquez Cao <fernando@oss.ntt.co.jp> | 2011-06-13 15:04:43 +0000 |
|---|---|---|
| committer | David S. Miller <davem@conan.davemloft.net> | 2011-06-16 23:14:12 -0400 |
| commit | 62b2bcb49cca72f6d3f39f831127a6ab315a475d (patch) | |
| tree | edb756747c2fcabb74d8422a7adb84e3a7bb3386 /net | |
| parent | d40261236e8e278cb1936cb5e934262971692b10 (diff) | |
| download | linux-62b2bcb49cca72f6d3f39f831127a6ab315a475d.tar.gz linux-62b2bcb49cca72f6d3f39f831127a6ab315a475d.tar.bz2 linux-62b2bcb49cca72f6d3f39f831127a6ab315a475d.zip | |
IGMP snooping: set mrouters_only flag for IPv4 traffic properly
Upon reception of a IGMP/IGMPv2 membership report the kernel sets the
mrouters_only flag in a skb that may be a clone of the original skb, which
means that sometimes the bridge loses track of membership report packets (cb
buffers are tied to a specific skb and not shared) and it ends up forwading
join requests to the bridge interface.
This can cause unexpected membership timeouts and intermitent/permanent loss
of connectivity as described in RFC 4541 [2.1.1. IGMP Forwarding Rules]:
A snooping switch should forward IGMP Membership Reports only to
those ports where multicast routers are attached.
[...]
Sending membership reports to other hosts can result, for IGMPv1
and IGMPv2, in unintentionally preventing a host from joining a
specific multicast group.
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Tested-by: Hayato Kakuta <kakuta.hayato@oss.ntt.co.jp>
Signed-off-by: David S. Miller <davem@conan.davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/bridge/br_multicast.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index 2f14eafdeeab..a6d87c17bb03 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -1424,7 +1424,7 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br, switch (ih->type) { case IGMP_HOST_MEMBERSHIP_REPORT: case IGMPV2_HOST_MEMBERSHIP_REPORT: - BR_INPUT_SKB_CB(skb2)->mrouters_only = 1; + BR_INPUT_SKB_CB(skb)->mrouters_only = 1; err = br_ip4_multicast_add_group(br, port, ih->group); break; case IGMPV3_HOST_MEMBERSHIP_REPORT: |