From 14f3ad6f4a12495b32b0dd743bc7179f36658208 Mon Sep 17 00:00:00 2001
From: Ulrich Weber <uweber@astaro.com>
Date: Fri, 26 Feb 2010 04:34:49 -0800
Subject: [PATCH] ipv6: Use 1280 as min MTU for ipv6 forwarding

Clients will set their MTU to 1280 if they receive a
ICMPV6_PKT_TOOBIG message with an MTU less than 1280.

To allow encapsulating of packets over a 1280 link
we should always accept packets with a size of 1280
for forwarding even if the path has a lower MTU and
fragment the encapsulated packets afterwards.

In case a forwarded packet is not going to be encapsulated
a ICMPV6_PKT_TOOBIG msg will still be send by ip6_fragment()
with the correct MTU.

Signed-off-by: Ulrich Weber <uweber@astaro.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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