[PATCH 0/10] af_unix: add multicast and filtering features to AF_UNIX

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This patch-set add multicast support to Unix domain socket familiy for datagram
and seqpacket sockets. This work was made by Alban Crequy as a result of a
research we have been doing to improve the performance of the D-bus IPC system.

The first approach was to create a new AF_DBUS socket address family and
move the routing logic of the D-bus daemon to the kernel. The motivations behind
that approach and the thread of the patches post can be found in [1] and [2].

The feedback was that having D-bus specific code in the kernel is a bad
idea so the second approach was to implement multicast Unix domain sockets so
clients can directly send messages to peers bypassing the D-bus daemon.
A previous version of the patches was already posted by Alban [3] who also has
a good explanation of the implementation on his blog [4].

[1]http://alban-apinc.blogspot.com/2011/12/d-bus-in-kernel-faster.html
[2]http://thread.gmane.org/gmane.linux.kernel/1040481
[3]http://thread.gmane.org/gmane.linux.network/178772
[4]http://alban-apinc.blogspot.com/2011/12/introducing-multicast-unix-sockets.html

The patch-set is composed of the following patches:

[PATCH 01/10] af_unix: Documentation on multicast unix sockets
[PATCH 02/10] af_unix: Add constant for unix socket options level
[PATCH 03/10] af_unix: add setsockopt on unix sockets
[PATCH 04/10] af_unix: create, join and leave multicast groups with setsockopt
[PATCH 05/10] af_unix: find the recipients of a multicast group
[PATCH 06/10] af_unix: Deliver message to several recipients in case of multicast
[PATCH 07/10] af_unix: implement poll(POLLOUT) for multicast sockets
[PATCH 08/10] af_unix: Unsubscribe sockets from their multicast groups on RCV_SHUTDOWN
[PATCH 09/10] Allow server side of SOCK_SEQPACKET sockets to accept a new member
[PATCH 10/10] af_unix: Add a peer BPF for multicast Unix sockets
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