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| author | Fernando Luis Vázquez Cao <fernando@oss.ntt.co.jp> | 2011-06-13 15:06:58 +0000 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2011-08-01 13:55:04 -0700 |
| commit | ef0c3e7d6e082b7f3cf41546525c84f4477a76d3 (patch) | |
| tree | 06e266514132d220e0ce8180d786775250f27aa3 | |
| parent | 8904f07a1b5683c4363b225cb376f2bd1435246f (diff) | |
| download | lwn-ef0c3e7d6e082b7f3cf41546525c84f4477a76d3.tar.gz lwn-ef0c3e7d6e082b7f3cf41546525c84f4477a76d3.zip | |
IGMP snooping: set mrouters_only flag for IPv6 traffic
[ upstream commit fc2af6c73fc9449cd5894a36bb76b8f8c0e49fd8 ]
properly
Upon reception of a MGM report packet the kernel sets the mrouters_only flag
in a skb that is a clone of the original skb, which means that the bridge
loses track of MGM 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>
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 7ab8ad30adcd..382a4288c518 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -1517,7 +1517,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br, case ICMPV6_MGM_REPORT: { struct mld_msg *mld = (struct mld_msg *)icmp6h; - BR_INPUT_SKB_CB(skb2)->mrouters_only = 1; + BR_INPUT_SKB_CB(skb)->mrouters_only = 1; err = br_ip6_multicast_add_group(br, port, &mld->mld_mca); break; } |