[PATCHv3 net-next 0/2] Exporting IGMP/MLD checking from bridge code

[Linus LÃssing]

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-listener-reports

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 v3:
* changed interface / restructuring of skb_checksum_trimmed()
* kernel doc for skb_checksum_trimmed()/skb_checksum_maybe_trim()
* fixed a memory leak in the cloned skb case in skb_checksum_trimmed()
* fixed transport_len calculation in __ipv6_mc_check_mld(),
  make it relative to the skb transport header offset
  (= exclude the hop-by-hop option size in transport_len)

Changelog v2:
* Updated copyright for mcast_snoop.c

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