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>

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: