# meta nfproto ipv4 rt nexthop 192.168.0.1
[
    {
        "match": {
            "left": {
                "meta": { "key": "nfproto" }
            },
	    "op": "==",
            "right": "ipv4"
        }
    },
    {
        "match": {
            "left": {
                "rt": {
                    "family": "ip",
                    "key": "nexthop"
                }
            },
	    "op": "==",
            "right": "192.168.0.1"
        }
    }
]