[RFC] [1/13] bridge: Add IGMP snooping support

Hi:

This series of patches adds basic IGMP support to the bridge
device.  First of all the following is not currently supported
but may be added in future:

* IGMPv3 source support (so really just IGMPv2 for now)
* Non-querier router detection
* IPv6

The series is divided into two portions:

1-5 lays the ground work and can be merged without any of the
other patches.

6-13 are the actual IGMP-specific patches.

This is a kernel-only implementation.  In future we could move
parts of this into user-space just like RTP.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} [off-list ref]
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