From c34963e21685659eb513e1c4d847f81d8a8f13f3 Mon Sep 17 00:00:00 2001 From: Linus Lüssing Date: Mon, 7 Jul 2014 05:41:17 +0200 Subject: bridge: export knowledge about the presence of IGMP/MLD queriers MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit With this patch other modules are able to ask the bridge whether an IGMP or MLD querier exists on the according, bridged link layer. Multicast snooping can only be performed if a valid, selected querier exists on a link. Just like the bridge only enables its multicast snooping if a querier exists, e.g. batman-adv too can only activate its multicast snooping in bridged scenarios if a querier is present. For instance this export avoids having to reimplement IGMP/MLD querier message snooping and parsing in e.g. batman-adv, when multicast optimizations for bridged scenarios are added in the future. Signed-off-by: Linus Lüssing Signed-off-by: David S. Miller --- include/linux/if_bridge.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/linux/if_bridge.h') diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h index e0c575ca89f7..808dcb8cc04f 100644 --- a/include/linux/if_bridge.h +++ b/include/linux/if_bridge.h @@ -40,6 +40,7 @@ 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, @@ -47,6 +48,11 @@ static inline int br_multicast_list_adjacent(struct net_device *dev, { 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) { -- cgit