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Message-Id: <20130814.133929.975837205960955245.davem@davemloft.net>
Date:	Wed, 14 Aug 2013 13:39:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kristian.evensen@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ipip: Add room for user-specified custom
 header

From: Kristian Evensen <kristian.evensen@...il.com>
Date: Mon, 12 Aug 2013 10:39:38 +0200

> This patch adds support for specifying the size of a custom header to be
> inserted between the two IP headers. The actual content will be inserted later,
> for example by a module that is attached to a hook.
> 
> A use-case for the feature provided by this patch is to ease the implementation
> of custom tunneling protocols. Instead of implementing them directly in the
> kernel and having to look out for changes in the kernel behavior/APIs, a
> tunneling protocol can be implemented as an independent module.
> 
> To avoid breaking user space (by updating ip_tunnel_params), it is only possible
> to specify the custom header length when an IPIP-tunnel is created using
> netlink-messages.
> 
> Signed-off-by: Kristian Evensen <kristian.evensen@...il.com>

Sorry I'm not even going to consider applying this until you post
use-cases for this feature, because right now it just looks like a
random way to facilitate some third party proprietary kernel module
or similar.
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