linux-kernel - [PATCH 3.13.y-ckt 115/132] bridge: multicast: restore router configuration on port link down/up

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Message-Id: <1437616850-23266-116-git-send-email-kamal@canonical.com>
Date:	Wed, 22 Jul 2015 19:00:33 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Satish Ashok <sashok@...ulusnetworks.com>,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 115/132] bridge: multicast: restore router configuration on port link down/up

3.13.11-ckt24 -stable 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>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/bridge/br_multicast.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 7bbc8fe..a798d27 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -36,6 +36,8 @@
 
 static void br_multicast_start_querier(struct net_bridge *br,
 				       struct bridge_mcast_query *query);
+static void br_multicast_add_router(struct net_bridge *br,
+				    struct net_bridge_port *port);
 unsigned int br_mdb_rehash_seq;
 
 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
@@ -920,6 +922,8 @@ void br_multicast_enable_port(struct net_bridge_port *port)
 #if IS_ENABLED(CONFIG_IPV6)
 	br_multicast_enable(&port->ip6_query);
 #endif
+	if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
+		br_multicast_add_router(br, port);
 
 out:
 	spin_unlock(&br->multicast_lock);
-- 
1.9.1

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