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, 7 insertions, 1 deletions

diff --git a/tests/shell/testcases/sets/dumps/0022type_selective_flush_0.nft b/tests/shell/testcases/sets/dumps/0022type_selective_flush_0.nft
index 0a4cb0a5..38987ded 100644
--- a/tests/shell/testcases/sets/dumps/0022type_selective_flush_0.nft
+++ b/tests/shell/testcases/sets/dumps/0022type_selective_flush_0.nft
@@ -7,7 +7,13 @@ table ip t {
 		type ipv4_addr : inet_service
 	}
 
+	set f {
+		type ipv4_addr
+		size 1024
+		flags dynamic
+	}
+
 	chain c {
-		tcp dport 80 meter f size 1024 { ip saddr limit rate 10/second burst 5 packets }
+		tcp dport 80 add @f { ip saddr limit rate 10/second burst 5 packets }
 	}
 }