[Bug 262295] [pf] Tables and anchors

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262295

            Bug ID: 262295
           Summary: [pf] Tables and anchors
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: security
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: matteo@FreeBSD.org
                CC: kp@freebsd.org

I would like to have a pf.conf similar to the following:

table <bruteforce> persist

block log quick from <bruteforce>

... more rules

anchor "external" on $interface {
  ... more rules

  pass in proto tcp from any to ($interface)
    port ${tcp_services} keep state \
    (max-src-conn 10, max-src-conn-rate 1/4, \
     overload <bruteforce> flush global)

  ... more rules

}

...more anchor/rules

If I try the above, when I load the rules I get:
pfctl: warning: namespace collision with <bruteforce> global table.

I then tried the following in pf.conf:

... some rules

anchor "external" on $interface {
  table <bruteforce> persist

  block log quick from <bruteforce>

  ... more rules

  pass in proto tcp from any to ($interface)
    port ${tcp_services} keep state \
    (max-src-conn 10, max-src-conn-rate 1/4, \
     overload <bruteforce> flush global)

  ... more rules

}

 ... more rules

And I got "syntax error" on the line where "table <bruteforce> persist" is and
on the line where the closing bracket of the anchor "external is.

It is unclear to whether I am making a mistake, or whether the first and/or the
second should actually work (and I would prefer at least the first to work, if
possible).

(This issue maybe, but perhaps not, related to #183198. This forum post
(https://forums.freebsd.org/threads/inline-anchor-table-fail.61116/) also shows
something similar to what I am experiencing)

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