linux-kernel - [PATCH 3.2 045/110] bridge: multicast: restore router configuration on port link down/up

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Date:	Mon, 10 Aug 2015 12:12:31 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Herbert Xu" <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	"Nikolay Aleksandrov" <nikolay@...ulusnetworks.com>,
	"Satish Ashok" <sashok@...ulusnetworks.com>
Subject: [PATCH 3.2 045/110] bridge: multicast: restore router
 configuration on port link down/up

3.2.71-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Satish Ashok <sashok@...ulusnetworks.com>

commit 754bc547f0a79f7568b5b81c7fc0a8d044a6571a upstream.

When a port goes through a link down/up the multicast router configuration
is not restored.

Signed-off-by: Satish Ashok <sashok@...ulusnetworks.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Fixes: 0909e11758bd ("bridge: Add multicast_router sysfs entries")
Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/bridge/br_multicast.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -36,6 +36,9 @@
 #define mlock_dereference(X, br) \
 	rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 
+static void br_multicast_add_router(struct net_bridge *br,
+				    struct net_bridge_port *port);
+
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
 {
@@ -842,6 +845,8 @@ void br_multicast_enable_port(struct net
 		goto out;
 
 	__br_multicast_enable_port(port);
+	if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
+		br_multicast_add_router(br, port);
 
 out:
 	spin_unlock(&br->multicast_lock);

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