tree bff2b347d1a1755955ba1b37c561b1bff2f6d861
parent fbf219f1c89b15e90ec2db5a3e9636376dc623db
author Ulrich Weber <uweber@astaro.com> 1267187689 -0800
committer David S. Miller <davem@davemloft.net> 1267187689 -0800

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>