How to add counter to set via libnftables-json? - netfilter

Question

In nftables since v0.9.5 named sets have specification counter (for each element in set). I can use it with nft cli or configuration file like:
set my_flows_meter {
type ipv4_addr . ipv4_addr . inet_service . inet_service . inet_proto
flags dynamic, timeout
counter
}
But I try to add named set with counter specification with libnftables-json add didn't find anything about that in mans.
I tried:
{"add": {
"set": {
"family": "ip",
"name": "my_flows_meter",
"table": "filter",
"type": [
"ipv4_addr",
"ipv4_addr",
"inet_service",
"inet_service",
"inet_proto"
],
"handle": 2,
"size": 65535,
"flags": [
"timeout"
],
"counter": null
}
}
}
But that's not working. Looks like libnftables-json just ignored that, bc set is added.

Answer 1

In version nftables v1.0.5 (Lester Gooch #4), the nft -j list set ... ... ... seem to print out the counters as well. But it prints it for each element and that's probably what you need to to as well.
{
"nftables" : [
{
"metainfo" : {
"json_schema_version" : 1,
"release_name" : "Lester Gooch #4",
"version" : "1.0.5"
}
},
{
"set" : {
"elem" : [
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"udp",
67
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"udp",
25
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"udp",
110
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"udp",
220
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"udp",
995
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"udp",
873
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"udp",
115
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 170088,
"packets" : 2585
},
"val" : {
"concat" : [
"udp",
53
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"udp",
22
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"udp",
5900
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"udp",
3389
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 11418,
"packets" : 6
},
"val" : {
"concat" : [
"udp",
{
"range" : [
1714,
1764
]
}
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
4713
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
{
"range" : [
1714,
1764
]
}
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
143
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 240,
"packets" : 4
},
"val" : {
"concat" : [
"tcp",
993
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 180,
"packets" : 3
},
"val" : {
"concat" : [
"tcp",
25
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
110
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
220
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
995
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
873
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
115
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 540,
"packets" : 9
},
"val" : {
"concat" : [
"tcp",
53
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
22
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
5900
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
3389
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"sctp",
22
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
10240
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 14200,
"packets" : 71
},
"val" : {
"concat" : [
"udp",
5678
]
}
}
},
{
"elem" : {
"counter" : {
"bytes" : 0,
"packets" : 0
},
"val" : {
"concat" : [
"tcp",
8291
]
}
}
}
],
"family" : "inet",
"flags" : [
"interval"
],
"handle" : 25,
"name" : "protocols",
"table" : "filter",
"type" : [
"inet_proto",
"inet_service"
]
}
}
]
}