diff options
| author | Hangbin Liu <liuhangbin@gmail.com> | 2018-10-26 10:28:43 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-10-26 16:01:23 -0700 |
| commit | 5a2de63fd1a59c30c02526d427bc014b98adf508 (patch) | |
| tree | 88b7a5fb81aada4bba94c68ff8d82bc40e2d598f /net | |
| parent | fb692ec4117f6fd25044cfb5720d6b79d400dc65 (diff) | |
| download | linux-5a2de63fd1a59c30c02526d427bc014b98adf508.tar.bz2 | |
bridge: do not add port to router list when receives query with source 0.0.0.0
Based on RFC 4541, 2.1.1. IGMP Forwarding Rules
The switch supporting IGMP snooping must maintain a list of
multicast routers and the ports on which they are attached. This
list can be constructed in any combination of the following ways:
a) This list should be built by the snooping switch sending
Multicast Router Solicitation messages as described in IGMP
Multicast Router Discovery [MRDISC]. It may also snoop
Multicast Router Advertisement messages sent by and to other
nodes.
b) The arrival port for IGMP Queries (sent by multicast routers)
where the source address is not 0.0.0.0.
We should not add the port to router list when receives query with source
0.0.0.0.
Reported-by: Ying Xu <yinxu@redhat.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/bridge/br_multicast.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index 024139b51d3a..41cdafbf2ebe 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -1422,7 +1422,15 @@ static void br_multicast_query_received(struct net_bridge *br, return; br_multicast_update_query_timer(br, query, max_delay); - br_multicast_mark_router(br, port); + + /* Based on RFC4541, section 2.1.1 IGMP Forwarding Rules, + * the arrival port for IGMP Queries where the source address + * is 0.0.0.0 should not be added to router port list. + */ + if ((saddr->proto == htons(ETH_P_IP) && saddr->u.ip4) || + (saddr->proto == htons(ETH_P_IPV6) && + !ipv6_addr_any(&saddr->u.ip6))) + br_multicast_mark_router(br, port); } static void br_ip4_multicast_query(struct net_bridge *br, |