{
  "nftables": [
    {
      "metainfo": {
        "version": "VERSION",
        "release_name": "RELEASE_NAME",
        "json_schema_version": 1
      }
    },
    {
      "table": {
        "family": "ip",
        "name": "t",
        "handle": 0
      }
    },
    {
      "chain": {
        "family": "ip",
        "table": "t",
        "name": "c",
        "handle": 0,
        "type": "filter",
        "hook": "input",
        "prio": 0,
        "policy": "accept"
      }
    },
    {
      "set": {
        "family": "ip",
        "name": "s1",
        "table": "t",
        "type": "inet_proto",
        "handle": 0,
        "size": 65535,
        "flags": [
          "dynamic"
        ]
      }
    },
    {
      "set": {
        "family": "ip",
        "name": "s2",
        "table": "t",
        "type": "ipv4_addr",
        "handle": 0,
        "size": 65535,
        "flags": [
          "dynamic"
        ]
      }
    },
    {
      "set": {
        "family": "ip",
        "name": "s3",
        "table": "t",
        "type": "ipv4_addr",
        "handle": 0,
        "size": 1024,
        "flags": [
          "dynamic"
        ]
      }
    },
    {
      "rule": {
        "family": "ip",
        "table": "t",
        "chain": "c",
        "handle": 0,
        "expr": [
          {
            "match": {
              "op": "==",
              "left": {
                "meta": {
                  "key": "iifname"
                }
              },
              "right": "foobar"
            }
          },
          {
            "set": {
              "op": "add",
              "elem": {
                "payload": {
                  "protocol": "ip",
                  "field": "protocol"
                }
              },
              "set": "@s1"
            }
          }
        ]
      }
    },
    {
      "rule": {
        "family": "ip",
        "table": "t",
        "chain": "c",
        "handle": 0,
        "expr": [
          {
            "match": {
              "op": "==",
              "left": {
                "meta": {
                  "key": "iifname"
                }
              },
              "right": "foobar"
            }
          },
          {
            "set": {
              "op": "add",
              "elem": {
                "payload": {
                  "protocol": "ip",
                  "field": "daddr"
                }
              },
              "set": "@s2"
            }
          }
        ]
      }
    },
    {
      "rule": {
        "family": "ip",
        "table": "t",
        "chain": "c",
        "handle": 0,
        "expr": [
          {
            "match": {
              "op": "==",
              "left": {
                "meta": {
                  "key": "iifname"
                }
              },
              "right": "foobar"
            }
          },
          {
            "set": {
              "op": "add",
              "elem": {
                "payload": {
                  "protocol": "ip",
                  "field": "daddr"
                }
              },
              "set": "@s3"
            }
          }
        ]
      }
    }
  ]
}