netdev - packet encryption based on gre key value with ip xfrm command

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Message-ID: <CAFXBA=miJQvBF=zP1=RGoq4fFi0ib-68DJOxLG8QpXXYPP-ACQ@mail.gmail.com>
Date:	Mon, 1 Jun 2015 01:51:05 +0530
From:	Harsh Jain <harshjain.prof@...il.com>
To:	netdev@...r.kernel.org
Subject: packet encryption based on gre key value with ip xfrm command

Hi,

I am trying to encrypt Gre packet have specific key values in GRE
header with following command

ip xfrm policy add src 192.168.1.9 dst 192.168.1.5 proto gre key 3 dir
in tmpl src 192.168.1.9 dst 192.168.1.5 proto esp reqid 16387 mode
transport

But it is not working. If I remove the "key 3" from above system
encrypt all GRE packets.

I tried with kernel version 3.18 and iproute2 version.2.4.

 I got iproute2 patch file having changes to support filtering based
on keys but didn't find corresponding kernel patch.
How to encrypt Packets based on GRE key value.?

Regards
Harsh Jain
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