# gre version 0
[
    {
        "match": {
            "left": {
                "payload": {
                    "field": "version",
                    "protocol": "gre"
                }
            },
            "op": "==",
            "right": 0
        }
    }
]

# gre ip saddr 10.141.11.2
[
    {
        "match": {
            "left": {
                "payload": {
                    "field": "saddr",
                    "protocol": "ip",
                    "tunnel": "gre"
                }
            },
            "op": "==",
            "right": "10.141.11.2"
        }
    }
]

# gre ip saddr 10.141.11.0/24
[
    {
        "match": {
            "left": {
                "payload": {
                    "field": "saddr",
                    "protocol": "ip",
                    "tunnel": "gre"
                }
            },
            "op": "==",
            "right": {
                "prefix": {
                    "addr": "10.141.11.0",
                    "len": 24
                }
            }
        }
    }
]

# gre ip protocol 1
[
    {
        "match": {
            "left": {
                "payload": {
                    "field": "protocol",
                    "protocol": "ip",
                    "tunnel": "gre"
                }
            },
            "op": "==",
            "right": 1
        }
    }
]

# gre udp sport 8888
[
    {
        "match": {
            "left": {
                "payload": {
                    "field": "sport",
                    "protocol": "udp",
                    "tunnel": "gre"
                }
            },
            "op": "==",
            "right": 8888
        }
    }
]

# gre icmp type echo-reply
[
    {
        "match": {
            "left": {
                "payload": {
                    "field": "type",
                    "protocol": "icmp",
                    "tunnel": "gre"
                }
            },
            "op": "==",
            "right": "echo-reply"
        }
    }
]

# gre ip dscp 0x02
[
    {
        "match": {
            "left": {
                "payload": {
                    "field": "dscp",
                    "protocol": "ip",
                    "tunnel": "gre"
                }
            },
            "op": "==",
            "right": 2
        }
    }
]

# gre ip dscp 0x02
[
    {
        "match": {
            "left": {
                "payload": {
                    "field": "dscp",
                    "protocol": "ip",
                    "tunnel": "gre"
                }
            },
            "op": "==",
            "right": 2
        }
    }
]

# gre ip saddr . gre ip daddr { 1.2.3.4 . 4.3.2.1 }
[
    {
        "match": {
            "left": {
                "concat": [
                    {
                        "payload": {
                            "field": "saddr",
                            "protocol": "ip",
                            "tunnel": "gre"
                        }
                    },
                    {
                        "payload": {
                            "field": "daddr",
                            "protocol": "ip",
                            "tunnel": "gre"
                        }
                    }
                ]
            },
            "op": "==",
            "right": {
                "set": [
                    {
                        "concat": [
                            "1.2.3.4",
                            "4.3.2.1"
                        ]
                    }
                ]
            }
        }
    }
]