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 *  @param header The IP packet header. Input parameter.
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 *  @param header The IP packet header. Input parameter.
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 */
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 */
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#define IP_HEADER_CHECKSUM( header )    ( htons( ip_checksum(( uint8_t * )( header ), IP_HEADER_LENGTH( header ))))
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#define IP_HEADER_CHECKSUM( header )    ( htons( ip_checksum(( uint8_t * )( header ), IP_HEADER_LENGTH( header ))))
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/** Returns the fragment offest.
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/** Returns the fragment offest.
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 *  @param header The IP packet header. Input parameter.
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 */
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#define IP_FRAGMENT_OFFSET( header ) (((( header )->fragment_offset_high << 8 ) + ( header )->fragment_offset_low ) * 8u )
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/** Returns the fragment offest high bits.
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 *  @param length The prefixed data total length. Input parameter.
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 */
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#define IP_COMPUTE_FRAGMENT_OFFSET_HIGH( length ) (((( length ) / 8u ) & 0x1F00 ) >> 8 )
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/** Returns the fragment offest low bits.
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 *  @param length The prefixed data total length. Input parameter.
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 *  @param length The prefixed data total length. Input parameter.
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 */
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 */
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#define IP_COMPUTE_FRAGMENT_OFFSET( length ) (( length ) / 8 )
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#define IP_COMPUTE_FRAGMENT_OFFSET_LOW( length ) ((( length ) / 8u ) & 0xFF )
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/** Type definition of the internet header.
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/** Type definition of the internet header.
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 *  @see ip_header
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 *  @see ip_header
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 */
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 */
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typedef struct ip_header    ip_header_t;
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typedef struct ip_header    ip_header_t;
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    /** An identifying value assigned by the sender to aid in assembling the fragments of a~datagram.
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    /** An identifying value assigned by the sender to aid in assembling the fragments of a~datagram.
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     */
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     */
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    uint16_t    identification;
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    uint16_t    identification;
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#ifdef ARCH_IS_BIG_ENDIAN
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#ifdef ARCH_IS_BIG_ENDIAN
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    /** Various control flags.
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    /** Various control flags.
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     *  @see
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     */
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     */
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    uint16_t    flags:3;
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    uint8_t flags:3;
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    /** This field indicates where in the datagram this fragment belongs.
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    /** This field indicates where in the datagram this fragment belongs.
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     *  High bits.
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     */
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     */
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    uint16_t    fragment_offset:3;
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    uint8_t fragment_offset_high:5;
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#else
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#else
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    /** This field indicates where in the datagram this fragment belongs.
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    /** This field indicates where in the datagram this fragment belongs.
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     *  High bits.
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     */
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     */
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    uint16_t    fragment_offset:13;
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    uint8_t fragment_offset_high:5;
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    /** Various control flags.
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    /** Various control flags.
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     */
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     */
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    uint16_t    flags:3;
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    uint8_t flags:3;
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#endif
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#endif
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    /** This field indicates where in the datagram this fragment belongs.
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     *  Low bits.
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     */
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    uint8_t fragment_offset_low;
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    /** This field indicates the maximum time the datagram is allowed to remain in the internet system.
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    /** This field indicates the maximum time the datagram is allowed to remain in the internet system.
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     *  If this field contains the value zero, then the datagram must be destroyed.
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     *  If this field contains the value zero, then the datagram must be destroyed.
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     *  This field is modified in internet header processing.
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     *  This field is modified in internet header processing.
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     *  The time is measured in units of seconds, but since every module that processes a~datagram must decrease the TTL by at least one even if it process the datagram in less than a~second, the TTL must be thought of only as an upper bound on the time a~datagram may exist.
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     *  The time is measured in units of seconds, but since every module that processes a~datagram must decrease the TTL by at least one even if it process the datagram in less than a~second, the TTL must be thought of only as an upper bound on the time a~datagram may exist.
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     *  The intention is to cause undeliverable datagrams to be discarded, and to bound the maximum datagram lifetime.
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     *  The intention is to cause undeliverable datagrams to be discarded, and to bound the maximum datagram lifetime.