From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net] ip6_tunnel: allow ip6gre dev mtu to be set below
 1280
Date: Tue, 02 Jan 2018 12:36:40 -0500 (EST)
Message-ID: <20180102.123640.1005693862725388582.davem@davemloft.net>
References: <2593c4a11b5ea0cf4efbec5517b7adec72ab4c17.1514184312.git.lucien.xin@gmail.com>
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From: Xin Long <lucien.xin@gmail.com>
Date: Mon, 25 Dec 2017 14:45:12 +0800

> Commit 582442d6d5bc ("ipv6: Allow the MTU of ipip6 tunnel to be set
> below 1280") fixed a mtu setting issue. It works for ipip6 tunnel.
> 
> But ip6gre dev updates the mtu also with ip6_tnl_change_mtu. Since
> the inner packet over ip6gre can be ipv4 and it's mtu should also
> be allowed to set below 1280, the same issue also exists on ip6gre.
> 
> This patch is to fix it by simply changing to check if parms.proto
> is IPPROTO_IPV6 in ip6_tnl_change_mtu instead, to make ip6gre to
> go to 'else' branch.
> 
> Signed-off-by: Xin Long <lucien.xin@gmail.com>

Applied.