From: David S. Miller <davem@davemloft.net>
Date: Tue, 5 Jul 2011 08:45:05 +0000 (-0700)
Subject: packet: Add fanout support.
X-Git-Tag: v3.1-rc1~316^2~229
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dc99f600698dcac69b8f56dda9a8a00d645c5ffc;p=pandora-kernel.git

packet: Add fanout support.

Fanouts allow packet capturing to be demuxed to a set of AF_PACKET
sockets.  Two fanout policies are implemented:

1) Hashing based upon skb->rxhash

2) Pure round-robin

An AF_PACKET socket must be fully bound before it tries to add itself
to a fanout.  All AF_PACKET sockets trying to join the same fanout
must all have the same bind settings.

Fanouts are identified (within a network namespace) by a 16-bit ID.
The first socket to try to add itself to a fanout with a particular
ID, creates that fanout.  When the last socket leaves the fanout
(which happens only when the socket is closed), that fanout is
destroyed.

Signed-off-by: David S. Miller <davem@davemloft.net>
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