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

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Date:	Sat,  2 May 2015 14:01:05 +0200
From:	Linus Lüssing <linus.luessing@...3.blue>
To:	b.a.t.m.a.n@...ts.open-mesh.org, netdev@...r.kernel.org,
	bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Tom Herbert <tom@...bertland.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCHv3 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-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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