netdev - Re: Source routing without rules?

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Date:	Wed, 28 Aug 2013 03:14:37 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Network Development <netdev@...r.kernel.org>
Subject: Re: Source routing without rules?

On Tue, Aug 27, 2013 at 05:16:21PM -0700, Andy Lutomirski wrote:
> I'm about to implement a trivial source routing policy for the third
> time, and this is IMO stupid.  I want to have two routes to a network.
>  Each route should specify a src, and, if the flow matches the src,
> then that route should win.
> 
> The rules that don't work are:
> 
> ip route add <net> via <gw1> dev <dev1> metric 0
> ip route add <net> via <gw2> dev <dev2> src <dev2addr> metric 10

src is actually the preferred src address. In ipv6 land there is a RTA_SRC
(look for ip route *from* parameter) route attribute settable to only
select routes if the from-source matches the route. If you implement
such a feature I would go with the same design (IPV6_SUBTREES).

Greetings,

  Hannes

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