From: stephen hemminger <shemminger@vyatta.com>
Date: Mon, 24 Sep 2012 18:12:23 +0000 (+0000)
Subject: gre: fix handling of key 0
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~47^2~68
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d208328765a0ab425e36b5b828285f3337a85451;p=pandora-kernel.git

gre: fix handling of key 0

GRE driver incorrectly uses zero as a flag value. Zero is a perfectly
valid value for key, and the tunnel should match packets with no key only
with tunnels created without key, and vice versa.

This is a slightly visible  change since previously it might be possible to
construct a working tunnel that sent key 0 and received only because
of the key wildcard of zero.  I.e the sender sent key of zero, but tunnel
was defined without key.

Note: using gre key 0 requires iproute2 utilities v3.2 or later.
The original utility code was broken as well.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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