evaluate: translate meter into dynamic set

129f9d153279 ("nft: migrate man page examples with `meter` directive to
sets") already replaced meters by dynamic sets.

This patch removes NFT_SET_ANONYMOUS flag from the implicit set that is
instantiated via meter, so the listing shows a dynamic set instead which
is the recommended approach these days.

Therefore, a batch like this:

 add table t
 add chain t c
 add rule t c tcp dport 80 meter m size 128 { ip saddr timeout 1s limit rate 10/second }

gets translated to a dynamic set:

 table ip t {
        set m {
                type ipv4_addr
                size 128
                flags dynamic,timeout
        }

        chain c {
                tcp dport 80 update @m { ip saddr timeout 1s limit rate 10/second burst 5 packets }
        }
 }

Check for NFT_SET_ANONYMOUS flag is also relaxed for list and flush
meter commands:

 # nft list meter ip t m
 table ip t {
        set m {
                type ipv4_addr
                size 128
                flags dynamic,timeout
        }
 }
 # nft flush meter ip t m

As a side effect the legacy 'list meter' and 'flush meter' commands allow
to flush a dynamic set to retain backward compatibility.

This patch updates testcases/sets/0022type_selective_flush_0 and
testcases/sets/0038meter_list_0 as well as the json output which now
uses the dynamic set representation.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/tests/shell/testcases/sets/0038meter_list_0 b/tests/shell/testcases/sets/0038meter_list_0
index e9e0f6fb..7c37c1d8 100755
--- a/tests/shell/testcases/sets/0038meter_list_0
+++ b/tests/shell/testcases/sets/0038meter_list_0
@@ -14,7 +14,12 @@ RULESET="
 "
 
 expected_output="table ip t {
-	meter m {
+	set s {
+		type ipv4_addr
+		size 256
+		flags dynamic,timeout
+	}
+	set m {
 		type ipv4_addr
 		size 128
 		flags dynamic