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Commit 9274f9f8 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'bridge_batmanadv_exports' 

Linus Lüssing says:

====================
bridge: multicast snooping exports #2

Some people pointed out to me that it might be helpful to add stubs for
the newly added multicast exports. That way e.g. batman-adv should continue
to be compile and useable without having to have a kernel compiled
with bridge code in the future. This is what the first patch is supposed
to do.

The second patch adds a third multicast export for the bridge which
e.g. batman-adv is supposed to use, too, soon: Just like the bridge
disables its multicast snooping activities if no querier is present,
batman-adv needs to do the same if bridges are involved.

These three exports should be the final ones needed to marry the bridge
multicast snooping with the batman-adv multicast optimizations recently
added for the 3.15 kernel, allowing to use these optimzations in common
setups having a bridge on top of e.g. bat0, too. So far these bridged
setups would fall back to simple flooding through the batman-adv mesh
network for any multicast packet entering bat0.

More information about the batman-adv multicast optimizations currently
implemented can be found here:

http://www.open-mesh.org/projects/batman-adv/wiki/Basic-multicast-optimizations

The integration on the batman-adv side could afterwards look like this,
for instance (now including the third export):

http://git.open-mesh.org/batman-adv.git/commitdiff/61e4f6af4b7a21ed4040f2e711d50c778e5b6d93?hp=6ae4281474675fbca5bedcf768972a32db586eb6
====================
parents 70452dcb c34963e2

include/linux/if_bridge.h

+20 −0
Original line number Diff line number Diff line
@@ -36,8 +36,28 @@ extern void brioctl_set(int (*ioctl_hook)(struct net *, unsigned int, void __use 


typedef int br_should_route_hook_t(struct sk_buff *skb);

extern br_should_route_hook_t __rcu *br_should_route_hook;



#if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)

int br_multicast_list_adjacent(struct net_device *dev,

			       struct list_head *br_ip_list);

bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto);

bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto);

#else

static inline int br_multicast_list_adjacent(struct net_device *dev,

					     struct list_head *br_ip_list)

{

	return 0;

}

static inline bool br_multicast_has_querier_anywhere(struct net_device *dev,

						     int proto)

{

	return false;

}

static inline bool br_multicast_has_querier_adjacent(struct net_device *dev,

						     int proto)

{

	return false;

}

#endif



#endif

net/bridge/br_multicast.c

+37 −0
Original line number Diff line number Diff line
@@ -2215,6 +2215,43 @@ int br_multicast_list_adjacent(struct net_device *dev, 
}

EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);



/**

 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge

 * @dev: The bridge port providing the bridge on which to check for a querier

 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6

 *

 * Checks whether the given interface has a bridge on top and if so returns

 * true if a valid querier exists anywhere on the bridged link layer.

 * Otherwise returns false.

 */

bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)

{

	struct net_bridge *br;

	struct net_bridge_port *port;

	struct ethhdr eth;

	bool ret = false;



	rcu_read_lock();

	if (!br_port_exists(dev))

		goto unlock;



	port = br_port_get_rcu(dev);

	if (!port || !port->br)

		goto unlock;



	br = port->br;



	memset(&eth, 0, sizeof(eth));

	eth.h_proto = htons(proto);



	ret = br_multicast_querier_exists(br, &eth);



unlock:

	rcu_read_unlock();

	return ret;

}

EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);



/**

 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port

 * @dev: The bridge port adjacent to which to check for a querier