ABORT Call

    CLOSED STATE (i.e., TCB does not exist)

      If the user should not have access to such a connection, return
      "error:  connection illegal for this process".

      Otherwise return "error:  connection does not exist".

    LISTEN STATE

      Any outstanding RECEIVEs should be returned with "error:
      connection reset" responses.  Delete TCB, enter CLOSED state, and
      return.

    SYN-SENT STATE

      All queued SENDs and RECEIVEs should be given "connection reset"
      notification, delete the TCB, enter CLOSED state, and return.

    SYN-RECEIVED STATE
    ESTABLISHED STATE
    FIN-WAIT-1 STATE
    FIN-WAIT-2 STATE
    CLOSE-WAIT STATE

      Send a reset segment:

        <SEQ=SND.NXT><CTL=RST>

      All queued SENDs and RECEIVEs should be given "connection reset"
      notification; all segments queued for transmission (except for the
      RST formed above) or retransmission should be flushed, delete the
      TCB, enter CLOSED state, and return.

    CLOSING STATE
    LAST-ACK STATE
    TIME-WAIT STATE

      Respond with "ok" and delete the TCB, enter CLOSED state, and
      return.