tcphdr

type tcphdr = record

  source: u_int16_t;

  dest: u_int16_t;

  seq: u_int32_t;

  ack_seq: u_int32_t;

  flag0: u_int16_t;

  window: u_int16_t;

  check: u_int16_t;

  urg_ptr: u_int16_t;

end;