net: bridge: Export bridge multicast router state

Add an access function that, given a bridge netdevice, returns whether the
bridge device is currently an mrouter or not. The function uses the already
existing br_multicast_is_router function to check that.

This function is needed in order to allow ports that join an already
existing bridge to know the current mrouter state of the bridge device.
Together with the bridge device mrouter ports switchdev notifications, it
is possible to have full offloading of the semantics of the bridge device
mcast router state.

Due to the fact that the bridge multicast router status can change in
packet RX path, take the multicast_router bridge spinlock to protect the
read.
Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Reviewed-by: Nogah Frankel <nogahf@mellanox.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/if_bridge.h

@@ -64,6 +64,7 @@ int br_multicast_list_adjacent(struct net_device *dev,
 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto);
 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto);
 bool br_multicast_enabled(const struct net_device *dev);
+bool br_multicast_router(const struct net_device *dev);
 #else
 static inline int br_multicast_list_adjacent(struct net_device *dev,
 					     struct list_head *br_ip_list)
@@ -84,6 +85,10 @@ static inline bool br_multicast_enabled(const struct net_device *dev)
 {
 	return false;
 }
+static inline bool br_multicast_router(const struct net_device *dev)
+{
+	return false;
+}
 #endif
 
 #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING)

net/bridge/br_multicast.c

@@ -2216,6 +2216,18 @@ bool br_multicast_enabled(const struct net_device *dev)
 }
 EXPORT_SYMBOL_GPL(br_multicast_enabled);
 
+bool br_multicast_router(const struct net_device *dev)
+{
+	struct net_bridge *br = netdev_priv(dev);
+	bool is_router;
+
+	spin_lock_bh(&br->multicast_lock);
+	is_router = br_multicast_is_router(br);
+	spin_unlock_bh(&br->multicast_lock);
+	return is_router;
+}
+EXPORT_SYMBOL_GPL(br_multicast_router);
+
 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
 {
 	unsigned long max_delay;