PSMs/TCP_state_machine.json

{
    "states": [
      "CLOSED",
      "LISTEN",
      "SYN_SENT",
      "SYN_RCVD",
      "ESTAB",
      "FIN_WAIT-1",
      "FIN_WAIT-2",
      "CLOSING",
      "TIME-WAIT",
      "CLOSE_WAIT",
      "LAST-ACK"
    ],
    "initial_state": "CLOSED",
    "final_states": [
      "CLOSED"
    ],
    "transitions": [
      {
        "from": "CLOSED",
        "event": "passive OPEN",
        "action": "create TCB",
        "to": "LISTEN"
      },
      {
        "from": "CLOSED",
        "event": "active OPEN",
        "action": "create TCB; send SYN",
        "to": "SYN_SENT"
      },
      {
        "from": "LISTEN",
        "event": "receive SYN",
        "action": "send SYN, ACK",
        "to": "SYN_RCVD"
      },
      {
        "from": "LISTEN",
        "event": "send SYN",
        "action": "send SYN",
        "to": "SYN_SENT"
      },
      {
        "from": "LISTEN",
        "event": "CLOSE",
        "action": "delete TCB",
        "to": "CLOSED"
      },
      {
        "from": "SYN_SENT",
        "event": "receive SYN",
        "action": "send SYN, ACK",
        "to": "SYN_RCVD"
      },
      {
        "from": "SYN_SENT",
        "event": "receive SYN, ACK",
        "action": "send ACK",
        "to": "ESTAB"
      },
      {
        "from": "SYN_SENT",
        "event": "CLOSE",
        "action": "delete TCB",
        "to": "CLOSED"
      },
      {
        "from": "SYN_RCVD",
        "event": "receive ACK of SYN",
        "action": "",
        "to": "ESTAB"
      },
      {
        "from": "SYN_RCVD",
        "event": "CLOSE",
        "action": "send FIN",
        "to": "FIN_WAIT-1"
      },
      {
        "from": "SYN_RCVD",
        "event": "rcv RST (note1)",
        "action": "",
        "to": "LISTEN"
      },
      {
        "from": "ESTAB",
        "event": "CLOSE",
        "action": "send FIN",
        "to": "FIN_WAIT-1"
      },
      {
        "from": "ESTAB",
        "event": "receive FIN",
        "action": "send ACK",
        "to": "CLOSE_WAIT"
      },
      {
        "from": "FIN_WAIT-1",
        "event": "receive FIN",
        "action": "send ACK",
        "to": "CLOSING"
      },
      {
        "from": "FIN_WAIT-1",
        "event": "receive ACK of FIN",
        "action": "",
        "to": "FIN_WAIT-2"
      },
      {
        "from": "FIN_WAIT-2",
        "event": "receive FIN",
        "action": "send ACK",
        "to": "TIME-WAIT"
      },
      {
        "from": "CLOSING",
        "event": "receive ACK of FIN",
        "action": "",
        "to": "TIME-WAIT"
      },
      {
        "from": "TIME-WAIT",
        "event": "Timeout=2MSL",
        "action": "delete TCB",
        "to": "CLOSED"
      },
      {
        "from": "CLOSE_WAIT",
        "event": "CLOSE",
        "action": "send FIN",
        "to": "LAST-ACK"
      },
      {
        "from": "LAST-ACK",
        "event": "receive ACK of FIN",
        "action": "delete TCB",
        "to": "CLOSED"
      }
    ]
  }