documentation/explaination on the syntax of the set_elem data arrangement.

Dear reader,

I am currently trying to wrap the libmnl into a C++ wrapper that allows to get (starting with that) and set rules. So far I was able (using reverse engineering ;-) figure out most of the stuff.

I am a bit stuck now on the set_elem in the set. Is there somewhere documentation that describes the syntax here?

What I get from the sets:

Table:  [lxc]
Set:    { "name":"__set1",
          "handle":4,
          "flags":3,
          "key": {
            "type":   ["service"],
            "length": 2
          },
          "userdata":{
            "length":6,
            "data": "00:04:02:00:00:00"
          },
          "elements": [
            { "key": {"type":"value","data":"06:00:01:00:00:35:00:00"} 
},
            { "key": {"type":"value","data":"06:00:01:00:00:43:00:00"} }
          ]
        }

I know that the elements in the set represent are the port number 53 (0x35) and 67 (0x43) :

"match":{
    "op":"==",
    "left":{
        "payload":{
            "protocol":"udp",
            "field":"dport"
        }
    },
    "right":{
        "set":[ 53, 67 ]
    }
}

What is the other information "06:00:01:00" and "00:00". Is there a document describing how to interpret the data or can someone explain or is reverse engineering the only option (got a bit hard on this part :-)

BR Pierre