From owner-freebsd-net@FreeBSD.ORG  Mon Mar 26 19:44:38 2007
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Message-ID: <46081CB9.6030109@net.utcluj.ro>
Date: Mon, 26 Mar 2007 22:19:21 +0300
From: Cristian KLEIN <cristi@net.utcluj.ro>
Organization: Data Communication Center - Technical University of Cluj-Napoca
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Subject: GRE with key
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X-List-Received-Date: Mon, 26 Mar 2007 19:44:38 -0000

Hello everybody,

I am new to FreeBSD kernel hacking, so please excuse my perhaps stupid
questions.

I would like to add key support to gre(4). I have already been able to
use gre(4) with a hardcoded key. The single thing remaining to do is to
transfer the key from ifconfig(8). The key is an uint32_t and I haven't
found a way to transfer it without modifying ifconfig(8).

My question is, which is the "BSD-style" to achieve the above? Solutions
I came up with are as follows:
1) Use SIOCSDRVSPEC / SIOCGDRVSPEC
2) Add SIOCSGREKEY / SIOCGGREKEY
3) [Probably to ugly to be mentioned, but requires fairy few
modifications.] Add a sysctl MIB which is read when calling "ifconfig
... create".

Another thing I wanted to ask is, which function of ifconfig(8) should I
modify to display the GRE key?

Thanks in advance.