netdev - Re: [PATCH] Add sk_mark route lookup support for IPv4 listening sockets, and for IPv4 multicast forwarding

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Date:	Wed, 14 Oct 2009 02:15:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	steve@...gwyn.com
Cc:	zenczykowski@...il.com, atis@...rotik.com, netdev@...r.kernel.org,
	panther@...abit.hu, eric.dumazet@...il.com, brian.haley@...com
Subject: Re: [PATCH] Add sk_mark route lookup support for IPv4 listening
 sockets, and for IPv4 multicast forwarding

From: steve@...gwyn.com
Date: Wed, 14 Oct 2009 08:23:19 +0100

> On Wed, Oct 14, 2009 at 12:51:56AM -0700, Maciej Żenczykowski wrote:
>> I'm thinking that the mark should be a tunnel parameter with values of
>> inherit or a constant.
>>
> Why not do this on a per-route basis (i.e. lets suppose we add a
> "setmark" parameter to each route) and this would allow changing
> a mark when a packet matches the route. This not only solves the
> tunnel case, but would be generically useful as well.
> 
> Since we have to look up routes anyway, it shouldn't add any
> real overhead to the routing process and we can benefit from
> all the existing infrastructure (route cache, etc).

This idea, I like :-)