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Date: Sun, 04 Apr 2004 18:46:11 -0400
From: Chuck Swiger <cswiger@mac.com>
Organization: The Courts of Chaos
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To: Brandon Erhart <berhart@ErhartGroup.COM>
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cc: freebsd-net@freebsd.org
Subject: Re: FIN_WAIT_[1,2] and LAST_ACK
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Brandon Erhart wrote:
> I want to explicitly get it out of those states, without any help from 
> the other end. What must I modify to achieve this?

See tcp_usrclosed() in /usr/src/sys/netinet/tcp_usrreq.c.  Replace that code 
with something like (untested):

    tp->t_state = TCPS_CLOSED;
    tp = tcp_close(tp);
    return tp;

...and you'll break your TCP/IP stack in the fashion you've asked for.
If other things break too, you can keep all of the pieces.  :-)

-- 
-Chuck