[Bug 226850] [pf] Matching but failed rules block without return

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226850

--- Comment #22 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kp
Date: Fri Jun 22 21:59:31 UTC 2018
New revision: 335569
URL: https://svnweb.freebsd.org/changeset/base/335569

Log:
  pf: Support "return" statements in passing rules when they fail.

  Normally pf rules are expected to do one of two things: pass the traffic or
  block it. Blocking can be silent - "drop", or loud - "return", "return-rst",
  "return-icmp". Yet there is a 3rd category of traffic passing through pf:
  Packets matching a "pass" rule but when applying the rule fails. This happens
  when redirection table is empty or when src node or state creation fails.
Such
  rules always fail silently without notifying the sender.

  Allow users to configure this behaviour too, so that pf returns an error
packet
  in these cases.

  PR:           226850
  Submitted by: Kajetan Staszkiewicz <vegeta tuxpowered.net>
  MFC after:    1 week
  Sponsored by: InnoGames GmbH

Changes:
  head/sbin/pfctl/parse.y
  head/share/man/man5/pf.conf.5
  head/sys/netpfil/pf/pf.c

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