netdev - Re: [PATCH RFC] xfrm{4,6}: only report errors back to local sockets if we don't cross address family

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Message-ID: <20130730082118.GA25511@secunet.com>
Date:	Tue, 30 Jul 2013 10:21:18 +0200
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	netdev@...r.kernel.org, vi0oss@...il.com,
	hannes@...essinduktion.org
Subject: Re: [PATCH RFC] xfrm{4,6}: only report errors back to local sockets
 if we don't cross address family

On Mon, Jul 29, 2013 at 04:50:17PM +0200, Hannes Frederic Sowa wrote:
> xfrm6_local_error/xfrm4_tunnel_check_size report mtu errors back to a
> socket in case it is locally generated. If the packet first traversed
> a 6in4/4in6 tunnel before passing the xfrm layer, we could get a panic
> because of address family type mismatch in the error reporting functions.
> 

So the skb is still owned by a socket of the inner address family.
Is this intentional? Maybe the ndo_start_xmit() function of the
tunnel device should orphan the skb if we tunnel the packet
through a different address family.

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