From eb1d16414339a6e113d89e2cca2556005d7ce919 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sat, 27 Feb 2010 19:41:45 +0000 Subject: bridge: Add core IGMP snooping support This patch adds the core functionality of IGMP snooping support without actually hooking it up. So this patch should be a no-op as far as the bridge's external behaviour is concerned. All the new code and data is controlled by the Kconfig option BRIDGE_IGMP_SNOOPING. A run-time toggle is also available. The multicast switching is done using an hash table that is lockless on the read-side through RCU. On the write-side the new multicast_lock is used for all operations. The hash table supports dynamic growth/rehashing. The hash table will be rehashed if any chain length exceeds a preset limit. If rehashing does not reduce the maximum chain length then snooping will be disabled. These features may be added in future (in no particular order): * IGMPv3 source support * Non-querier router detection * IPv6 Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/bridge/Kconfig | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'net/bridge/Kconfig') diff --git a/net/bridge/Kconfig b/net/bridge/Kconfig index e143ca678881..78dd5497210a 100644 --- a/net/bridge/Kconfig +++ b/net/bridge/Kconfig @@ -31,3 +31,15 @@ config BRIDGE will be called bridge. If unsure, say N. + +config BRIDGE_IGMP_SNOOPING + bool "IGMP snooping" + default y + ---help--- + If you say Y here, then the Ethernet bridge will be able selectively + forward multicast traffic based on IGMP traffic received from each + port. + + Say N to exclude this support and reduce the binary size. + + If unsure, say Y. -- cgit