4.18-stable review patch. If anyone has any objections, please let me know.
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From: Hangbin Liu liuhangbin@gmail.com
[ Upstream commit 5a2de63fd1a59c30c02526d427bc014b98adf508 ]
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/bridge/br_multicast.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
--- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -1420,7 +1420,15 @@ static void br_multicast_query_received( 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 int br_ip4_multicast_query(struct net_bridge *br,