1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +---------------+---------------+---------------+---------------+
 |  TCPOpt kind  | TCPOpt Length | Value  (opt)  |  ....         |
 +---------------+---------------+---------------+---------------+
 |                             ....                              |
 +---------------------------------------------------------------+
 |                              ...                              |
 +---------------------------------------------------------------+