# meta nfproto ipv4 ip saddr 1.2.3.4
[
    {
        "match": {
            "left": {
                "payload": {
                    "field": "saddr",
                    "protocol": "ip"
                }
            },
	    "op": "==",
            "right": "1.2.3.4"
        }
    }
]

# meta nfproto ipv6 meta l4proto tcp
[
    {
        "match": {
            "left": {
                "meta": { "key": "nfproto" }
            },
	    "op": "==",
            "right": "ipv6"
        }
    },
    {
        "match": {
            "left": {
                "meta": { "key": "l4proto" }
            },
	    "op": "==",
            "right": 6
        }
    }
]

# meta secpath missing
[
    {
        "match": {
            "left": {
                "meta": {
                    "key": "ipsec"
                }
            },
            "op": "==",
            "right": false
        }
    }
]