netdev - Re: [PATCH] ipv6: Fix the upper MTU limit in GRE tunnel

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Message-Id: <20131008.165239.783847414637978838.davem@davemloft.net>
Date:	Tue, 08 Oct 2013 16:52:39 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ou.ghorbel@...il.com
Cc:	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv6: Fix the upper MTU limit in GRE tunnel

From: Oussama Ghorbel <ou.ghorbel@...il.com>
Date: Mon,  7 Oct 2013 18:50:05 +0100

> Unlike ipv4, the struct member hlen holds the length of the GRE and ipv6
> headers. This length is also counted in dev->hard_header_len.
> Perhaps, it's more clean to modify the hlen to count only the GRE header
> without ipv6 header as the variable name suggest, but the simple way to fix
> this without regression risk is simply modify the calculation of the limit
> in ip6gre_tunnel_change_mtu function.
> Verified in kernel version v3.11.
> 
> Signed-off-by: Oussama Ghorbel <ou.ghorbel@...il.com>
> Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Applied.
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