linux-kernel - Re: [PATCH] make ipv4 multicast packets only get delivered to sockets that are joined to group

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Message-ID: <OF0C86B64A.DE64FE98-ON882571E8.004F57A7-882571E8.004FDDED@us.ibm.com>
Date:	Wed, 13 Sep 2006 07:32:22 -0700
From:	David Stevens <dlstevens@...ibm.com>
To:	Jeff Layton <jlayton@...chiereds.net>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	netdev-owner@...r.kernel.org
Subject: Re: [PATCH] make ipv4 multicast packets only get delivered to sockets	that
 are joined to group

netdev-owner@...r.kernel.org wrote on 09/13/2006 07:13:55 AM:

> Only
> the socket that is bound to the group address to which the packet was
> sent should get it.

        This is not true on any OS I'm aware of, including the
original sockets multicast implementation on early BSD.

        Multicast group membership is per-interface, not per-socket.
Joining a group on any socket on the machine allows packets for that
group to be delivered on the interface where it was joined.

Delivery of packets to a socket is determined by the binding, and
INADDR_ANY means "any".

IPv6 behaves the same way.
                                                                +-DLS


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