netdev - Re: Problem with xfrm (ipsec) as state/spi selected solely on outer ip addresses

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Date:	Mon, 14 May 2007 11:00:21 +0300
From:	Joakim Koskela <joakim.koskela@...t.fi>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	netdev@...r.kernel.org
Subject: Re: Problem with xfrm (ipsec) as state/spi selected solely on outer ip addresses

On Friday 11 May 2007 19:13:41 Patrick McHardy wrote:
> Joakim Koskela wrote:
> > I'm running a system where there might be multiple simultenously
> > active ipsec states between two hosts (ipv6, but guess it applies to
> > v4 as well) where the outer ip is the same for all states, but the
> > inner differ (using beet mode).
> >
> > The problem is that after establishing these states, it seems that the
> > one associated with outgoing traffic is selected solely by the outer
> > address (the first state matching the outer ip-pairs is used), which
> > usually results in the wrong spi and the packet being dropped at the
> > receiver.
>
> This should only pick states matching the flow:
>
> if (x->km.state == XFRM_STATE_VALID) {
>
>
>         if (!xfrm_selector_match(&x->sel, fl, family) ||
>             !security_xfrm_state_pol_flow_match(x, pol, fl))
>                 continue;
> ...
>
> I'm probably misunderstanding your configuration, could you post the
> SA selectors and addresses that result in an incorrect state being
> picked?
>
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Oh, your right. I wasn't setting the netmask correctly (zero) for the 
selectors, making them match anything. Sorry for the waste of time!

br, j

-- 
Joakim Koskela
Helsinki Institute for Information Technology (HIIT)
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