{
  "nftables": [
    {
      "metainfo": {
        "version": "VERSION",
        "release_name": "RELEASE_NAME",
        "json_schema_version": 1
      }
    },
    {
      "table": {
        "family": "inet",
        "name": "filter",
        "handle": 0
      }
    },
    {
      "chain": {
        "family": "inet",
        "table": "filter",
        "name": "ssh_input",
        "handle": 0
      }
    },
    {
      "chain": {
        "family": "inet",
        "table": "filter",
        "name": "wan_input",
        "handle": 0
      }
    },
    {
      "chain": {
        "family": "inet",
        "table": "filter",
        "name": "prerouting",
        "handle": 0,
        "type": "filter",
        "hook": "prerouting",
        "prio": -300,
        "policy": "accept"
      }
    },
    {
      "rule": {
        "family": "inet",
        "table": "filter",
        "chain": "wan_input",
        "handle": 0,
        "expr": [
          {
            "vmap": {
              "key": {
                "payload": {
                  "protocol": "tcp",
                  "field": "dport"
                }
              },
              "data": {
                "set": [
                  [
                    22,
                    {
                      "jump": {
                        "target": "ssh_input"
                      }
                    }
                  ]
                ]
              }
            }
          }
        ]
      }
    },
    {
      "rule": {
        "family": "inet",
        "table": "filter",
        "chain": "prerouting",
        "handle": 0,
        "expr": [
          {
            "vmap": {
              "key": {
                "meta": {
                  "key": "iif"
                }
              },
              "data": {
                "set": [
                  [
                    {
                      "elem": {
                        "val": "lo",
                        "counter": {
                          "packets": 0,
                          "bytes": 0
                        }
                      }
                    },
                    {
                      "jump": {
                        "target": "wan_input"
                      }
                    }
                  ]
                ]
              }
            }
          }
        ]
      }
    }
  ]
}