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

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Date:	Thu, 24 Sep 2015 14:32:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jbenc@...hat.com
Cc:	netdev@...r.kernel.org, tgraf@...g.ch, roopa@...ulusnetworks.com
Subject: Re: [PATCH net 0/2] lwtunnel: make it really work, for IPv4

From: Jiri Benc <jbenc@...hat.com>
Date: Tue, 22 Sep 2015 18:12:10 +0200

> One of the selling points of lwtunnel was the ability to specify the tunnel
> destination using routes. However, this doesn't really work currently, as
> ARP and ndisc replies are not handled correctly. ARP and ndisc replies won't
> have tunnel metadata attached, thus they will be sent out with the default
> parameters or not sent at all, either way never reaching the requester.
> 
> Most of the egress tunnel parameters can be inferred from the ingress
> metada. The only and important exception is UDP ports. This patchset infers
> the egress data from the ingress data and disallow settings of UDP ports in
> tunnel routes. If there's a need for different UDP ports, a new interface
> needs to be created for each port combination. Note that it's still possible
> to specify the UDP ports to use, it just needs to be done while creating the
> vxlan/geneve interface.
> 
> This covers only ARPs. IPv6 ndisc has the same problem but is harder to
> solve, as there's already dst attached to outgoing skbs. Ideas to solve this
> are welcome.

I'm applying this series as-is, as it's a reasonable step forward in
dealing with this issue.

Thanks Jiri.
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