kernel: bridge: backport two snooping related patches

With this patch the following two patches are backported:

* bridge: fix parsing of MLDv2 reports
* bridge: allow setting hash_max + multicast_router if interface is down

The former one is an important fix which got just applied to the net-tree
and is queued for stable. The latter is a patch which is needed to make
the hash_max and multicast_router attributes configurable through
netifd.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>

SVN-Revision: 45783

target/linux/generic/patches-3.18/051-01-bridge-fix-parsing-of-MLDv2-reports.patch

@@ -0,0 +1,58 @@
+From 1430a5975e1a5f249875faab7fd35b915a8d2397 Mon Sep 17 00:00:00 2001
+From: Thadeu Lima de Souza Cascardo <cascardo@redhat.com>
+Date: Fri, 22 May 2015 12:18:59 -0300
+Subject: [PATCH] bridge: fix parsing of MLDv2 reports
+
+When more than a multicast address is present in a MLDv2 report, all but
+the first address is ignored, because the code breaks out of the loop if
+there has not been an error adding that address.
+
+This has caused failures when two guests connected through the bridge
+tried to communicate using IPv6. Neighbor discoveries would not be
+transmitted to the other guest when both used a link-local address and a
+static address.
+
+This only happens when there is a MLDv2 querier in the network.
+
+The fix will only break out of the loop when there is a failure adding a
+multicast address.
+
+The mdb before the patch:
+
+dev ovirtmgmt port vnet0 grp ff02::1:ff7d:6603 temp
+dev ovirtmgmt port vnet1 grp ff02::1:ff7d:6604 temp
+dev ovirtmgmt port bond0.86 grp ff02::2 temp
+
+After the patch:
+
+dev ovirtmgmt port vnet0 grp ff02::1:ff7d:6603 temp
+dev ovirtmgmt port vnet1 grp ff02::1:ff7d:6604 temp
+dev ovirtmgmt port bond0.86 grp ff02::fb temp
+dev ovirtmgmt port bond0.86 grp ff02::2 temp
+dev ovirtmgmt port bond0.86 grp ff02::d temp
+dev ovirtmgmt port vnet0 grp ff02::1:ff00:76 temp
+dev ovirtmgmt port bond0.86 grp ff02::16 temp
+dev ovirtmgmt port vnet1 grp ff02::1:ff00:77 temp
+dev ovirtmgmt port bond0.86 grp ff02::1:ff00:def temp
+dev ovirtmgmt port bond0.86 grp ff02::1:ffa1:40bf temp
+
+Fixes: 08b202b67264 ("bridge br_multicast: IPv6 MLD support.")
+Reported-by: Rik Theys <Rik.Theys@esat.kuleuven.be>
+Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@redhat.com>
+Tested-by: Rik Theys <Rik.Theys@esat.kuleuven.be>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ net/bridge/br_multicast.c |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/net/bridge/br_multicast.c
++++ b/net/bridge/br_multicast.c
+@@ -1071,7 +1071,7 @@ static int br_ip6_multicast_mld2_report(
+ 
+ 		err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
+ 						 vid);
+-		if (!err)
++		if (err)
+ 			break;
+ 	}
+ 

target/linux/generic/patches-3.18/051-02-bridge-allow-setting-hash_max-multicast_router-if-in.patch

@@ -0,0 +1,99 @@
+From 6ae4ae8e512bd229f806c22f8a2cd751e4f987c2 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Linus=20L=C3=BCssing?= <linus.luessing@c0d3.blue>
+Date: Sat, 23 May 2015 03:12:34 +0200
+Subject: [PATCH] bridge: allow setting hash_max + multicast_router if
+ interface is down
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Network managers like netifd (used in OpenWRT for instance) try to
+configure interface options after creation but before setting the
+interface up.
+
+Unfortunately the sysfs / bridge currently only allows to configure the
+hash_max and multicast_router options when the bridge interface is up.
+But since br_multicast_init() doesn't start any timers and only sets
+default values and initializes timers it should be save to reconfigure
+the default values after that, before things actually get active after
+the bridge is set up.
+
+Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ net/bridge/br_multicast.c |   24 +++---------------------
+ 1 file changed, 3 insertions(+), 21 deletions(-)
+
+--- a/net/bridge/br_multicast.c
++++ b/net/bridge/br_multicast.c
+@@ -1949,11 +1949,9 @@ out:
+ 
+ int br_multicast_set_router(struct net_bridge *br, unsigned long val)
+ {
+-	int err = -ENOENT;
++	int err = -EINVAL;
+ 
+ 	spin_lock_bh(&br->multicast_lock);
+-	if (!netif_running(br->dev))
+-		goto unlock;
+ 
+ 	switch (val) {
+ 	case 0:
+@@ -1964,13 +1962,8 @@ int br_multicast_set_router(struct net_b
+ 		br->multicast_router = val;
+ 		err = 0;
+ 		break;
+-
+-	default:
+-		err = -EINVAL;
+-		break;
+ 	}
+ 
+-unlock:
+ 	spin_unlock_bh(&br->multicast_lock);
+ 
+ 	return err;
+@@ -1979,11 +1972,9 @@ unlock:
+ int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
+ {
+ 	struct net_bridge *br = p->br;
+-	int err = -ENOENT;
++	int err = -EINVAL;
+ 
+ 	spin_lock(&br->multicast_lock);
+-	if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
+-		goto unlock;
+ 
+ 	switch (val) {
+ 	case 0:
+@@ -2005,13 +1996,8 @@ int br_multicast_set_port_router(struct
+ 
+ 		br_multicast_add_router(br, p);
+ 		break;
+-
+-	default:
+-		err = -EINVAL;
+-		break;
+ 	}
+ 
+-unlock:
+ 	spin_unlock(&br->multicast_lock);
+ 
+ 	return err;
+@@ -2116,15 +2102,11 @@ unlock:
+ 
+ int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
+ {
+-	int err = -ENOENT;
++	int err = -EINVAL;
+ 	u32 old;
+ 	struct net_bridge_mdb_htable *mdb;
+ 
+ 	spin_lock_bh(&br->multicast_lock);
+-	if (!netif_running(br->dev))
+-		goto unlock;
+-
+-	err = -EINVAL;
+ 	if (!is_power_of_2(val))
+ 		goto unlock;
+ 

target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch

@@ -130,7 +130,7 @@
  		err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
 -						 vid);
 +						 vid, src);
- 		if (!err)
+ 		if (err)
  			break;
  	}
 @@ -1407,7 +1434,8 @@ br_multicast_leave_group(struct net_brid