IPFW2 patch

Hello, Developers!

Sorry, my english is bad. :(

Patch to IPFW2 for adding restrictions of the traffic with use IPFW
bytes counters.
It include two parts:

* First part is ipfw_bound.patch, this part add ipfw rule options "bound
VALUE" and "check-bound NUM".
Example:
# ipfw add 100 allow ip from any to any bound 10K
# ipfw add 200 deny ip from any to any

While bytes counter of rule 100 below 10 KBytes, it work.

Example:
# ipfw add 100 allow ip from A.B.C.D to any out xmit internet
check-bound 200
# ipfw add 200 allow ip from any to A.B.C.D in recv internet bound 100M
# ipfw add 300 deny ip from any to any via internet

While bytes counter of rule 200 below 100 MBytes, rules 100 and 200 work.
NOTE: Check-bound option search rule NUM like "ipfw skipto", but if rule
NUM not contain bound option, then match fail.

Second part is bound_change.patch, this part add control call to ipfw
for boundary value change without bytes counter reset.
Syntax:
# ipfw bound NUM [set N] change VALUE.

Files:
For CURRENT:
http://butcher.heavennet.ru/ipfw_bound/CURRENT/ipfw_bound.patch
http://butcher.heavennet.ru/ipfw_bound/CURRENT/bound_change.patch

For RELENG_5:
http://butcher.heavennet.ru/ipfw_bound/RELENG_5/ipfw_bound.patch
http://butcher.heavennet.ru/ipfw_bound/RELENG_5/bound_change.patch

For RELENG_5_4:
http://butcher.heavennet.ru/ipfw_bound/RELENG_5_4/ipfw_bound.patch
http://butcher.heavennet.ru/ipfw_bound/RELENG_5_4/bound_change.patch

-- 
WBR, Andrey V. Elsukov