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>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45783 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 99 insertions, 0 deletions

diff --git a/target/linux/generic/patches-3.18/051-02-bridge-allow-setting-hash_max-multicast_router-if-in.patch b/target/linux/generic/patches-3.18/051-02-bridge-allow-setting-hash_max-multicast_router-if-in.patch
new file mode 100644
index 0000000000..c899c10cff
--- /dev/null
+++ b/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;
+