[Bug 1174] New: 'define' functionality not sufficient for maintaining sets and the like

[bugzilla-daemon at netfilter.org]

https://bugzilla.netfilter.org/show_bug.cgi?id=1174

            Bug ID: 1174
           Summary: 'define' functionality not sufficient for maintaining
                    sets and the like
           Product: nftables
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: nft
          Assignee: pablo at netfilter.org
          Reporter: netfilter at allycomm.com

Objective -- define in a single location a list of ports to be used in
initializing sets and in rules

Result -- no "obvious" way to do this

Expected -- define would either be a straight textual substitution, or would be
able to accept a notation appropriate for defining sets, maps, and the like
that need to be consistent across multiple uses in rule sets

The following fail, in various ways when trying to use
 elements = { $some_ports }

* define some_ports = { 80, 443 }
* define some_ports = 80, 443
* define some_ports = http, https
* define some_ports = 80

* define some_ports = "{ 80, 443 }"
fails when trying to use
  elements = $some_ports

* define no_ports = { } 
fails, as does directly using
* elements = { }

Agreed, can omit the elements declaration, but important:
* To clearly indicate that the intended initial condition is empty
* For automated script-generation tools which would otherwise need to test for
and branch if there were no elements

Typical context:

table ip global {

    set forwarded_ports {
        type inet_service
    elements = { 80, 443 }
    }

    set some_ports_set {
        type inet_service
    elements = { $some_ports }
    }

    set no_forwarded_ports {
        type inet_service
#    elements = {  }    # fails
    }

}

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