netdev - xfrm_neigh_lookup and dst->path

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Message-ID: <alpine.LFD.2.11.1702111354440.1601@ja.home.ssi.bg>
Date:   Sat, 11 Feb 2017 15:12:44 +0200 (EET)
From:   Julian Anastasov <ja@....bg>
To:     Steffen Klassert <steffen.klassert@...unet.com>
cc:     netdev@...r.kernel.org
Subject: xfrm_neigh_lookup and dst->path


	Hello,

On Fri, 3 Feb 2017, Steffen Klassert wrote:

> On Thu, Feb 02, 2017 at 01:04:34AM +0200, Julian Anastasov wrote:
> > 
> > 	For now I installed common handler, just like
> > xfrm_neigh_lookup. BTW this function has problem from
> > commit f894cbf847c9, it looks like dst is wrongly provided,
> > first arg should be dst->path.
> 
> Yes, this should use dst->path of course. I really wonder why
> nobody noticed this for the last five years.

	IMHO, xfrm_neigh_lookup is not used often. If used,
it should be from a place before skb->dst xforms are popped in
xfrm_output_one, i.e. somewhere before the output processing.
I see that dst_neigh_lookup*() is used mostly in xmit handlers
of tunnel devices, I assume, after xfrm_output_one().
Not sure for br_nf_pre_routing_finish_bridge().

	I'm trying to fix this code but we have the
same problem as in xfrm_confirm_neigh: to find address
of last tunnel. Should we use the same loop?

Regards

--
Julian Anastasov <ja@....bg>