+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- - - - - - - - -
      |  Option Type  |  Opt Data Len |  Option Data
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- - - - - - - - -

      Option Type          8-bit identifier of the type of option.

      Opt Data Len         8-bit unsigned integer.  Length of the Option
                           Data field of this option, in octets.

      Option Data          Variable-length field.  Option-Type-specific
                           data.

Option values are used inside option headers (for example: Hop-by-Hop options and Destination options).