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IGMPv3 for Linux

To: <davem@xxxxxxxxxx>
Subject: IGMPv3 for Linux
From: Vince Laviano <vlaviano@xxxxxxxxx>
Date: Mon, 15 Jul 2002 17:39:19 -0700 (PDT)
Cc: <kuznet@xxxxxxxxxxxxx>, <linux-net@xxxxxxxxxxxxxxx>, <netdev@xxxxxxxxxxx>, <wilbert@xxxxxxxxxxxxxxx>, <eckert@xxxxxxxxx>
Sender: owner-netdev@xxxxxxxxxxx
Hi everyone,

I've been working on a port of Wilbert de Graaf's (wilbert@xxxxxxxxxxxxxxx)
IGMPv3 implementation for FreeBSD to Linux 2.4.x.

A tarball containing the patch (against Linux 2.4.6), documentation, and some
test programs demonstrating use of the new multicast source filter (MSF) API
is available at

This is alpha quality software, and there is still a good amount of work to be
done, but it's reached a stage where some people may find it useful.  Also, I'm
anxious to receive feedback on both the high-level approach and on any specific
problems that people detect.

Known limitations are:
    - ip_mc_destroy_dev() not yet implemented
    - probable concurrency issues
    - Only traditional struct ip_mreq accepted by MSF API functions; no
      support for struct ip_mreqn (i.e. identification of join interface by
    - ip_mc_inc_group() and ip_mc_dec_group() internal interface used by GRE
      not yet implemented.
    - Source filters not used for raw socket delivery, only for UDP delivery
    - Coarse-grained locking
    - Protocol-independent MSF API not implemented

The web page for the original FreeBSD implementation is in the middle of being
migrated to  For now, a Google-
cached copy can be viewed at

Vince Laviano

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