net: bridge: remove ipv6 zero address check in mcast queries

Recently a check was added which prevents marking of routers with zero
source address, but for IPv6 that cannot happen as the relevant RFCs
actually forbid such packets:
RFC 2710 (MLDv1):
"To be valid, the Query message MUST
 come from a link-local IPv6 Source Address, be at least 24 octets
 long, and have a correct MLD checksum."

Same goes for RFC 3810.

And also it can be seen as a requirement in ipv6_mc_check_mld_query()
which is used by the bridge to validate the message before processing
it. Thus any queries with :: source address won't be processed anyway.
So just remove the check for zero IPv6 source address from the query
processing function.

Fixes: bba950621ee2 ("bridge: do not add port to router list when receives query with source 0.0.0.0")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 41cdafbf2ebe52591ede41a1dc53473a41c5b843..6bac0d6b7b94137923ce29eac503518dcaa131d6 100644 (file)
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1428,8 +1428,7 @@ static void br_multicast_query_received(struct net_bridge *br,
         * 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)))
+           saddr->proto == htons(ETH_P_IPV6))
                br_multicast_mark_router(br, port);
 }