# 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
        }
    }
]

# ip saddr . ether saddr . meta l4proto { 1.2.3.4 . aa:bb:cc:dd:ee:ff . 6 }
[
    {
        "match": {
            "left": {
                "concat": [
                    {
                        "payload": {
                            "field": "saddr",
                            "protocol": "ip"
                        }
                    },
                    {
                        "payload": {
                            "field": "saddr",
                            "protocol": "ether"
                        }
                    },
                    {
                        "meta": {
                            "key": "l4proto"
                        }
                    }
                ]
            },
            "op": "==",
            "right": {
                "set": [
                    {
                        "concat": [
                            "1.2.3.4",
                            "aa:bb:cc:dd:ee:ff",
                            6
                        ]
                    }
                ]
            }
        }
    }
]