diff options
Diffstat (limited to 'net/bridge/br_multicast.c')
| -rw-r--r-- | net/bridge/br_multicast.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index abfa0b65a11..b4845f4b2bb 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -2216,6 +2216,43 @@ 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(ð, 0, sizeof(eth)); + eth.h_proto = htons(proto); + + ret = br_multicast_querier_exists(br, ð); + +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 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 |