Commit 0e719e3a authored Oct 07, 2013 by Oussama Ghorbel Committed by David S. Miller Oct 08, 2013

ipv6: Fix the upper MTU limit in GRE tunnel



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@gmail.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent dc62ccac

net/ipv6/ip6_gre.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -1173,9 +1173,8 @@ done:

		static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
		{
		struct ip6_tnl *tunnel = netdev_priv(dev);
		if (new_mtu < 68 \|\|
		new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
		new_mtu > 0xFFF8 - dev->hard_header_len)
		return -EINVAL;
		dev->mtu = new_mtu;
		return 0;

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