linux-kernel - [PATCH 4.9 15/93] net: bridge: allow IPv6 when multicast flood is disabled

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Date:   Mon, 20 Mar 2017 18:50:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        Mike Manning <mmanning@...cade.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 15/93] net: bridge: allow IPv6 when multicast flood is disabled

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mike Manning <mmanning@...cade.com>


[ 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@...ulusnetworks.com>
Signed-off-by: Mike Manning <mmanning@...cade.com>
Acked-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/bridge/br_forward.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -186,8 +186,9 @@ void br_flood(struct net_bridge *br, str
 		/* 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 */