[B.A.T.M.A.N.] [PATCHv2 net-next 0/2] Exporting IGMP/MLD checking from bridge code

The multicast optimizations in batman-adv are yet only usable and enabled in non-bridged scenarios. To be able to support bridged setups batman-adv needs to be able to detect IGMP/MLD queriers and reports on mesh nodes without bridges, too. See the following link for details:

http://www.open-mesh.org/projects/batman-adv/wiki/Multicast-optimizations-li...

To avoid duplicate code between the bridge and batman-adv, the IGMP/MLD message validation code is moved from the bridge to the IPv4/IPv6 stack.

On the way, some refactoring to increase readability and to iron out some subtle differences between the IGMP and MLD parsing code is done.

Cheers, Linus

Changelog v2: * Updated copyright for mcast_snoop.c