netdev - Re: [PATCH net 0/2] lwtunnel: make it really work, for IPv4

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Date:	Wed, 23 Sep 2015 10:09:57 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Jiri Benc <jbenc@...hat.com>, netdev@...r.kernel.org,
	Roopa Prabhu <roopa@...ulusnetworks.com>
Subject: Re: [PATCH net 0/2] lwtunnel: make it really work, for IPv4

On 09/22/15 at 11:39pm, Eric W. Biederman wrote:
> What distinguishes a skb received from a tunnel as opposed to a skb
> received on from a network device is that a skb recevied on a tunnel
> has a socket.
> 
> I could be easily missing something but couldn't you look at skb->sk
> on the input path and if a socket is present use the socket to compute
> the outgoing route?
> 
> I expect it would just need to be something like:
> dst = sk_dst_check(sk, 0);

If you are talking about the UDP socket then that socket would cache
the underlay route corresponding to the outer header. Jiri is looking
for the outer header route to derive tunnel parameters from.
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