From 980edbd503dc0823c75e138edc53a48f99e1e3f6 Mon Sep 17 00:00:00 2001
From: Simon Vincent <simon.vincent@xsilon.com>
Date: Tue, 4 Nov 2014 15:29:51 +0000
Subject: [PATCH] 6lowpan: fix udp header compression when using raw sockets

If you use RAW sockets the transport header offset is not set by the
ipv6 stack so when we get to the udp header compression it does not
compress the right part of the packet.

This patch adds a check for this scenario and sets the transport
header offset.

Signed-off-by: Simon Vincent <simon.vincent@xsilon.com>
Acked-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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