diff options
| author | Fernando Luis Vázquez Cao <fernando@oss.ntt.co.jp> | 2011-06-13 15:04:43 +0000 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2011-08-01 13:55:04 -0700 |
| commit | 8904f07a1b5683c4363b225cb376f2bd1435246f (patch) | |
| tree | 859182719557c52f07748c6a4406f03fb5f0b64b | |
| parent | ea626c8fccc5b119bf1d398d99e7ecad4bfc95e2 (diff) | |
IGMP snooping: set mrouters_only flag for IPv4 traffic
[ upstream commit 62b2bcb49cca72f6d3f39f831127a6ab315a475d ]
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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
| -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 5a9bcfe981c..7ab8ad30adc 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -1403,7 +1403,7 @@ 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: |