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authorNikolay Aleksandrov <nikolay@cumulusnetworks.com>2018-10-27 12:07:47 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-11-04 14:51:56 +0100
commit1757ec69500e8a0b78032b05958d120b535eac97 (patch)
treeb196368a17e36640d588dac0c4b8aefee2522186
parent2ec673dbb0cd4304b71599451a2363051fd26e14 (diff)
net: bridge: remove ipv6 zero address check in mcast queries
commit 0fe5119e267f3e3d8ac206895f5922195ec55a8a upstream. 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: 5a2de63fd1a5 ("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> Cc: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/bridge/br_multicast.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index b4e5c515a6da..6059a47f5e0c 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1426,8 +1426,7 @@ 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);
}