Cristian KLEIN wrote:
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).
Excellent. Thanks for volunteering to do this!
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".
If I were doing this, I would add the code to ifconfig.c where the other
tunnel stuff lives, and go for option number 2. Feel free to modify
ifconfig to accomodate the the new options.
Another thing I wanted to ask is, which function of ifconfig(8) should I
modify to display the GRE key?
Look at how af_status_tunnel() works and consider adding it there.
Regards,
BMS
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