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     */
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     */
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    uint8_t     ttl;
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    uint8_t     ttl;
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    /** This field indicates the next level protocol used in the data portion of the internet datagram.
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    /** This field indicates the next level protocol used in the data portion of the internet datagram.
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     */
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     */
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    uint8_t     protocol;
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    uint8_t     protocol;
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    /** A checksum on the header only.
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    /** A checksum of the header only.
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     *  Since some header fields change (e.g., time to live), this is recomputed and verified at each point that the internet header is processed.
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     *  Since some header fields change (e.g., time to live), this is recomputed and verified at each point that the internet header is processed.
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     *  The checksum algorithm is: The checksum field is the 16~bit one's complement of the one's complement sum of all 16~bit words in the header.
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     *  The checksum algorithm is: The checksum field is the 16~bit one's complement of the one's complement sum of all 16~bit words in the header.
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     *  For purposes of computing the checksum, the value of the checksum field is zero.
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     *  For purposes of computing the checksum, the value of the checksum field is zero.
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     */
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     */
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    uint16_t    header_checksum;
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    uint16_t    header_checksum;
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    /** The destination address.
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    /** The destination address.
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     */
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     */
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    uint32_t    destination_address;
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    uint32_t    destination_address;
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} __attribute__ ((packed));
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} __attribute__ ((packed));
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/** Type definition of the internet option header.
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 *  @see ip_header
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 */
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typedef struct ip_option    ip_option_t;
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typedef struct ip_option    ip_option_t;
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/** Type definition of the internet option header pointer.
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 *  @see ip_header
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 */
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typedef ip_option *     ip_option_ref;
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typedef ip_option *     ip_option_ref;
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/** Internet option header.
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/** Internet option header.
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 *  Only type field is always valid.
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 *  Only type field is always valid.
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 *  Other fields' validity depends on the option type.
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 *  Other fields' validity depends on the option type.