[Bug 197484] fix pf 3whs ACK handling

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197484

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kp
Date: Sun Nov 18 10:47:51 UTC 2018
New revision: 340559
URL: https://svnweb.freebsd.org/changeset/base/340559

Log:
  MFC r339470:

  pf synproxy will do the 3WHS on behalf of the target machine, and once
  the 3WHS is completed, establish the backend connection. The trigger
  for "3WHS completed" is the reception of the first ACK. However, we
  should not proceed if that ACK also has RST or FIN set.

  PR:           197484
  Obtained from:        OpenBSD

Changes:
_U  stable/11/
  stable/11/sys/netpfil/pf/pf.c

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