where to find info on ipfw programming interface?

From: Alex (alex_at_dynaweb.ru)
Date: 11/13/03

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    Date: Thu, 13 Nov 2003 16:55:07 +0300
To: freebsd-questions@freebsd.org

    Hi ppl!

    I need to be able to control ipfw rules from within my program.
    A year ago I spent a week to get how to do this using ipfw utility
    sources. And at last successfully did it after a lot of probes and falls :0)
    But now since 5.0 FreeBSD is using another implementation (so called
    IPFW2) which is much more comprehensive and I believe robust at least as
    I got from ip_fw.h
    But in any case some thing are still unclear for me.

    So the question is: where can I find some kind of formal specification
    on what order commands and actions must be placed in a rule and what
    kind of parameters are needed for every kind of op_code.

    If there're anything about thsi problem I'd be very glad to have a copy
    or at last a link to :0)

    Alex

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