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Date:      Thu, 26 Jul 2007 01:58:03 +0200
From:      Max Laier <max@love2party.net>
To:        JD Bronson <jbronson@sixcompanies.com>
Cc:        Jordan Gordeev <jgordeev@dir.bg>, freebsd-questions@freebsd.org
Subject:   Re: pf and keep/modulate state on 6.2
Message-ID:  <200707260158.12963.max@love2party.net>
In-Reply-To: <200707251950.l6PJoRxk029389@smtp.sixcompanies.com>
References:  <200702252202.l1PM2r46003312@cheyenne.sixcompanies.com> <200707252055.50780.max@love2party.net> <200707251950.l6PJoRxk029389@smtp.sixcompanies.com>

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On Wednesday 25 July 2007, JD Bronson wrote:
> At 08:55 PM 7/25/2007 +0200, Max Laier wrote:
> >On Saturday 21 July 2007, Jordan Gordeev wrote:
> > > I'm replying to an old and long-forgotten thread to report my
> > > recent findings.
> > > There's a bug in PF with modulate/synproxy state. Modulate/synproxy
> > > state modulate sequence numbers, but don't modulate sequence
> > > numbers in TCP SACK options. Some firewalls block TCP segments with
> > > sequence numbers in the SACK option pointing outside the window,
> > > which causes connection stalls. The bug was fixed in OpenBSD with
> > > revision 1.509 of src/sys/net/pf.c about an year and a half ago.
> > > The bug is present in FreeBSD-STABLE. A fix for the bug was
> > > imported in FreeBSD-CURRENT with the big import of PF from OpenBSD
> > > 4.1.
> > > I'm CC-ing Max to notify him of the bug present in -STABLE and to
> > > ask him to deal with the issue by either porting the fix from
> > > OpenBSD, or by documenting that modulate/synproxy state is broken.
> >
> >Good catch - sorry for the delay.  Here is the diff (almost verbatim
> > from OPENBSD_3_8).  Please test and report back.  I plan to commit
> > this to RELENG_6 in a bit.
> >
> >--
> >/"\  Best regards,                      | mlaier@freebsd.org
> >\ /  Max Laier                          | ICQ #67774661
>
> Max - 3.8? Cant we get a bit closer and more up-to-date as far as
> staying with pf and openbsd?
>
> I know pf changed - especially for OBSD 4.1 and it would be nice to
> be CLOSER than 3.8 ?

Well, in RELENG_6 we can't (pf update breaks ABI =3D no go in a RELENG=20
branch).  In HEAD we have 4.1 since a couple of weeks.

=2D-=20
/"\  Best regards,                      | mlaier@freebsd.org
\ /  Max Laier                          | ICQ #67774661
 X   http://pf4freebsd.love2party.net/  | mlaier@EFnet
/ \  ASCII Ribbon Campaign              | Against HTML Mail and News

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