net: bridge: allow IPv6 when multicast flood is disabled

BugLink: http://bugs.launchpad.net/bugs/1675032
[ Upstream commit 8953de2f02ad7b15e4964c82f9afd60f128e4e98 ]

Even with multicast flooding turned off, IPv6 ND should still work so
that IPv6 connectivity is provided. Allow this by continuing to flood
multicast traffic originated by us.

Fixes: b6cb5ac8331b ("net: bridge: add per-port multicast flood flag")
Cc: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Mike Manning <mmanning@brocade.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 7cb41aee4c82e63b4f278e64564c3ab7e8db3e10..8498e35036059e083d5ccd49ae36ca8c9bc25fcd 100644 (file)
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -186,8 +186,9 @@ void br_flood(struct net_bridge *br, struct sk_buff *skb,
                /* Do not flood unicast traffic to ports that turn it off */
                if (pkt_type == BR_PKT_UNICAST && !(p->flags & BR_FLOOD))
                        continue;
+               /* Do not flood if mc off, except for traffic we originate */
                if (pkt_type == BR_PKT_MULTICAST &&
-                   !(p->flags & BR_MCAST_FLOOD))
+                   !(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev)
                        continue;
 
                /* Do not flood to ports that enable proxy ARP */