# iifname "eth0" tcp dport 81 snat ip to 192.168.3.2
[
    {
        "match": {
            "left": {
                "meta": {
                    "key": "iifname"
                }
            },
            "op": "==",
            "right": "eth0"
        }
    },
    {
        "match": {
            "left": {
                "payload": {
                    "field": "dport",
                    "protocol": "tcp"
                }
            },
            "op": "==",
            "right": 81
        }
    },
    {
        "snat": {
            "addr": "192.168.3.2",
            "family": "ip"
        }
    }
]

# iifname "eth0" tcp dport 81 ip saddr 10.1.1.1 snat to 192.168.3.2
[
    {
        "match": {
            "left": {
                "meta": {
                    "key": "iifname"
                }
            },
            "op": "==",
            "right": "eth0"
        }
    },
    {
        "match": {
            "left": {
                "payload": {
                    "field": "dport",
                    "protocol": "tcp"
                }
            },
            "op": "==",
            "right": 81
        }
    },
    {
        "match": {
            "left": {
                "payload": {
                    "field": "saddr",
                    "protocol": "ip"
                }
            },
            "op": "==",
            "right": "10.1.1.1"
        }
    },
    {
        "snat": {
            "addr": "192.168.3.2",
            "family": "ip"
        }
    }
]

# iifname "eth0" tcp dport 81 snat ip6 to dead::beef
[
    {
        "match": {
            "left": {
                "meta": {
                    "key": "iifname"
                }
            },
            "op": "==",
            "right": "eth0"
        }
    },
    {
        "match": {
            "left": {
                "payload": {
                    "field": "dport",
                    "protocol": "tcp"
                }
            },
            "op": "==",
            "right": 81
        }
    },
    {
        "snat": {
            "addr": "dead::beef",
            "family": "ip6"
        }
    }
]

# iifname "foo" masquerade random
[
    {
        "match": {
            "left": {
                "meta": {
                    "key": "iifname"
                }
            },
            "op": "==",
            "right": "foo"
        }
    },
    {
        "masquerade": {
            "flags": "random"
        }
    }
]