netdev - Re: xfrm transport mode policy and forward packets

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Message-ID: <20091022132126.GB28893@gondor.apana.org.au>
Date:	Thu, 22 Oct 2009 22:21:26 +0900
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Timo Teräs <timo.teras@....fi>
Cc:	netdev@...r.kernel.org, Alexey Kuznetsov <kuznet@....inr.ac.ru>
Subject: Re: xfrm transport mode policy and forward packets

On Thu, Oct 22, 2009 at 03:07:28PM +0300, Timo Teräs wrote:
>
> I'm using on my dmvpn environment security policies like:
>
> src 0.0.0.0/0 dst 0.0.0.0/0 proto gre 	dir in priority 2147483648 ptype 
> main 	tmpl src 0.0.0.0 dst 0.0.0.0
> 		proto esp reqid 0 mode transport
>
> src 0.0.0.0/0 dst 0.0.0.0/0 proto gre 	dir out priority 2147483648 ptype 
> main 	tmpl src 0.0.0.0 dst 0.0.0.0
> 		proto esp reqid 0 mode transport
>
> To make sure the locally generated/received GRE traffic is IPsec protected.
> Now when some other non-local gre traffic is being forwarded by this router,
> that seems to match these SPs too. Basically no one behind this router box
> can use GRE (or PPTP).

This is expected since forwarded GRE packets match the selector
given.

> My ideas so far have been:
> a) rename 'fwd' to 'infwd' and split 'out' to 'out' and 'outfwd' ?
>   (sounds kinda intrusive)
> b) iptables target that would be able to disable xfrm
>
> Any other ideas?
> What would be the proper fix for this problem?

We could add the fwmark as a key.

Alexey and others may have better ideas on this.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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