netdev - Re: [net-next-2.6 PATCH 1/7] xfrm: introduce basic mark infrastructure

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Message-ID: <m3hbphxrnm.fsf@ursa.amorsen.dk>
Date:	Tue, 16 Feb 2010 13:59:41 +0100
From:	Benny Amorsen <benny+usenet@...rsen.dk>
To:	hadi@...erus.ca
Cc:	Patrick McHardy <kaber@...sh.net>, timo.teras@....fi,
	herbert@...dor.apana.org.au, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [net-next-2.6 PATCH 1/7] xfrm: introduce basic mark infrastructure

jamal <hadi@...erus.ca> writes:

> With these patches if you set policy routing mark, have the proper
> setting in the skb or socket for the mark then the proper
> route will be selected. If you have an SPD + SA added with the
> same mark, those will be used right after the route is selected. 
> So essentially you have the same mark across.
> Does that solve or alleviate the problem?

I don't actually use marks at all, I do policy routing based on source
address. Currently rules are based on source interface, but all IPSEC
traffic comes from the same interface, unlike some tunnel-based
solutions.

Right now packets going out through an IPSEC tunnel do not hit the
routing table at all -- they just get shunted into the tunnel. Anything
that gives me the chance to run the packets through normal routing
before the tunnel grabs them works for me.

>From your description, I would add the IPSEC SPD + SA with a specific
mark. Then I would set the mark in the rule table if I want the packets
to go through the tunnel, or clear the mark to have them go through
normal routing. Not perfect, because I would have to replicate parts of
the routing table in the rule table, but it could be made to work.

Perfect would be if I could set mark in the routing table instead of the
rule table, but sometimes perfect is the enemy of good...

/Benny

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