[patch] attach ipfw rules to jails

[Christian S.J. Peron]

I have written support for attaching ipfw rules to jails. I am 
looking for some testers/feedback.

http://people.freebsd.org/~csjp/ip_fw_jail.diff

NOTES:
o Apply the patch
o cd /usr/src && make includes
o rebuild your kernel (or just the ipfw module)
o rebuild the ipfw userspace utility;

Syntax:

ipfw add count ip from any to any jail 1

"jail" takes a numeric argument, a jail ID.

For those of you who dont know, jail IDs can be retrieved using
the jls(8) utility.

Input would be greatly appriciated.
Thanks!

-- 
Christian S.J. Peron
csjp at FreeBSD.ORG
FreeBSD Committer