[Bug 209475] pf didn't check if enough free RAM for net.pf.states_hashsize

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209475

--- Comment #31 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kp
Date: Sun Feb 25 08:56:44 UTC 2018
New revision: 329950
URL: https://svnweb.freebsd.org/changeset/base/329950

Log:
  pf: Cope with overly large net.pf.states_hashsize

  If the user configures a states_hashsize or source_nodes_hashsize value we
may
  not have enough memory to allocate this. This used to lock up pf, because
these
  allocations used M_WAITOK.

  Cope with this by attempting the allocation with M_NOWAIT and falling back to
  the default sizes (with M_WAITOK) if these fail.

  PR:           209475
  Submitted by: Fehmi Noyan Isi <fnoyanisi AT yahoo.com>
  MFC after:    3 weeks
  Differential Revision:        https://reviews.freebsd.org/D14367

Changes:
  head/sys/net/pfvar.h
  head/sys/netpfil/pf/pf.c

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