netdev - Re: ipv6: oops in datagram.c line 260

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Message-ID: <20150107122607.GC13046@secunet.com>
Date:	Wed, 7 Jan 2015 13:26:07 +0100
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Hannes Frederic Sowa <hannes@...hat.com>
CC:	Chris Ruehl <chris.ruehl@...ys.com.hk>, <netdev@...r.kernel.org>,
	<davem@...emloft.net>
Subject: Re: ipv6: oops in datagram.c line 260

On Wed, Jan 07, 2015 at 11:45:02AM +0100, Hannes Frederic Sowa wrote:
> On Mi, 2015-01-07 at 08:22 +0100, Steffen Klassert wrote:
> > On Tue, Jan 06, 2015 at 05:01:13PM +0100, Hannes Frederic Sowa wrote:
> > > 
> > > xfrm6_output_finish unconditionally resets skb->protocol so we try to
> > > dispatch to the IPv6 handler, even though tcp just sends an IPv4 packet.
> > 
> > Maybe we better dispatch based on sk->sk_family, this should give
> > always the right address family of the socket.
> 
> The original problem was dealing with IPv4/v6 mapped traffic. Processing
> local errors from unconnected UDP sockets which are emitting both IPv4
> and IPv6 frames won't play nicely with sk->sk_family I fear.

Good point, unfortunately it is not so easy to fix as I thought.
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