[Bug 230619] pf: tables use non SMP-friendly counters

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230619

            Bug ID: 230619
           Summary: pf: tables use non SMP-friendly counters
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: vegeta at tuxpowered.net

Created attachment 196197
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=196197&action=edit
Use counter(9) in pf tables.

Counters of pf tables are updated out of rule lock. That means state updates
might overwrite eachother. Furthermore there is allocation and freing counters
happening in lockless manner too.

Proposed patch modifies table counters behaviour. counter(9) facility is used
and table element counters are always allocated so that race conditions are
impossible now.

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