netdev - Re: [Bugme-new] [Bug 16216] New: wrong source addr of UDP packets when using policy routing

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Date:	Wed, 16 Jun 2010 19:28:29 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, borg@....net
Subject: Re: [Bugme-new] [Bug 16216] New: wrong source addr of UDP packets
 when using policy routing

Le mercredi 16 juin 2010 à 18:46 +0200, Patrick McHardy a écrit :

> This is know behaviour, fwmarks don't work for source address selection
> since before the source address is chosen, you don't even have a packet
> which could be marked.

We know have sk->sk_mark routing (socket based), so we might change
sk->sk_mark with appropriate iptables target when one packet is
received... not very clean but worth to mention...

commit 914a9ab386a288d0f22252fc268ecbc048cdcbd5
Author: Atis Elsts <atis@...rotik.com>
Date:   Thu Oct 1 15:16:49 2009 -0700

    net: Use sk_mark for routing lookup in more places
    
    This patch against v2.6.31 adds support for route lookup using sk_mark in some
    more places. The benefits from this patch are the following.
    First, SO_MARK option now has effect on UDP sockets too.
    Second, ip_queue_xmit() and inet_sk_rebuild_header() could fail to do routing
    lookup correctly if TCP sockets with SO_MARK were used.
    
    Signed-off-by: Atis Elsts <atis@...rotik.com>
    Acked-by: Eric Dumazet <eric.dumazet@...il.com>


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