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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
====================
This commit is contained in:
David S. Miller 2014-07-08 16:13:10 -07:00
parent 70452dcb6d c34963e216
commit 9274f9f895
2 changed files with 57 additions and 0 deletions
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20
include/linux/if_bridge.h
View File

@ -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

37
net/bridge/br_multicast.c
View File

@ -2215,6 +2215,43 @@ unlock:
}
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