netdev - Re: Socket receives packet to multicast group to which it was not joined since kernel 3.13.10-1

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Date:	Sun, 24 May 2015 04:55:40 +0000 (UTC)
From:	Oliver Graff <oliver.e.graff@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: Socket receives packet to multicast group to which it was not joined since kernel 3.13.10-1

Shawn Bohrer <shawn.bohrer <at> gmail.com> writes:

> 
> On Tue, May 13, 2014 at 04:36:41PM -0500, Shawn Bohrer wrote:

> > If I did "break" something here it appears to be because with
> > ip_early_demux we only call ip_check_mc_rcu() once on the initial
> > packet, and subsequent packets destined for that socket simply need to
> > pass the __udp_is_mcast_sock() test.  With ip_early_demux disaled we
> > call ip_check_mc_rcu() for every packet.
> 
> So is the solution to effectively call ip_check_mc_rcu() inside
> udp_v4_early_demux()?
> 
> --
> Shawn
> 
(See earlier parts of thread here: 
http://netdev.vger.kernel.narkive.com/mwurLsMT/socket-receives-packet-to-multicast-
group-to-which-it-was-not-joined-since-kernel-3-13-10-1)

Was a bug report filed for this / was this fixed? 
I looked at the diffs from the referenced commit and the current version of 
udp_v4_early_demux and the changes appear to be 
minimal,
it doesn't look like ip_check_mc_rcu was added. Is that all that's needed?

- Oliver



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