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 *  @{
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 *  @{
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 */
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 */
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/** @file
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/** @file
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 *  IP header and options definitions.
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 *  IP header and options definitions.
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 *  Names according to the linux src/include/linux/ip.h header file.
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 *  Based on the RFC~791.
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 */
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 */
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#ifndef __NET_IP_HEADER_H__
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#ifndef __NET_IP_HEADER_H__
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#define __NET_IP_HEADER_H__
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#define __NET_IP_HEADER_H__
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#include <byteorder.h>
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#include <byteorder.h>
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#include <sys/types.h>
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#include <sys/types.h>
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/** Returns the actual IP header length.
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 *  @param header The IP packet header. Input parameter.
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 */
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#define IP_HEADER_LENGTH( header )      (( header )->header_length * 4u )
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/** Returns the actual IP header length.
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 *  @param header The IP packet header. Input parameter.
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 */
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#define IP_COMPUTE_HEADER_LENGTH( length )      (( uint8_t ) (( length ) / 4u ))
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/** Returns the actual IP packet total length.
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 *  @param header The IP packet header. Input parameter.
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 */
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#define IP_TOTAL_LENGTH( header )       ntohs(( header )->total_length )
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/** Returns the actual IP packet data length.
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 *  @param header The IP packet header. Input parameter.
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 */
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#define IP_HEADER_DATA_LENGTH( header ) ( IP_TOTAL_LENGTH( header ) - IP_HEADER_LENGTH( header ))
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/** Returns the IP packet header checksum.
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 *  @param header The IP packet header. Input parameter.
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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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/** Returns the fragment offest.
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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( length ) (( length ) / 8 )
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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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     */
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     */
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    uint8_t     version:4;
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    uint8_t     version:4;
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    /** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.
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    /** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.
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     *  Note that the minimum value for a~correct header is~5.
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     *  Note that the minimum value for a~correct header is~5.
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     */
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     */
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    uint8_t     ihl:4;
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    uint8_t     header_length:4;
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#else
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#else
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    /** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.
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    /** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.
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     *  Note that the minimum value for a~correct header is~5.
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     *  Note that the minimum value for a~correct header is~5.
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     */
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     */
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    uint8_t     ihl:4;
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    uint8_t     header_length:4;
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    /** The Version field indicates the format of the internet header.
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    /** The Version field indicates the format of the internet header.
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     */
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     */
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    uint8_t     version:4;
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    uint8_t     version:4;
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#endif
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#endif
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    /** The Type of Service provides an indication of the abstract parameters of the quality of service desired.
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    /** The Type of Service provides an indication of the abstract parameters of the quality of service desired.
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 */
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 */
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#define IPFLAG_MORE_FRAGMENTS       ( 0x1 << IPFLAG_FRAGMENTED_SHIFT )
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#define IPFLAG_MORE_FRAGMENTS       ( 0x1 << IPFLAG_FRAGMENTED_SHIFT )
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/*@}*/
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/*@}*/
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/*
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#define IPOPT_OPTVAL 0
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#define IPOPT_OLEN   1
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#define IPOPT_OFFSET 2
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#define IPOPT_MINOFF 4
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#define MAX_IPOPTLEN 40
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*/
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/** Type definition of the internet version 4 pseudo header.
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/** Type definition of the internet version 4 pseudo header.
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 *  @see ipv4_pseudo_header
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 *  @see ipv4_pseudo_header
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 */
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 */
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typedef struct ipv4_pseudo_header   ipv4_pseudo_header_t;
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typedef struct ipv4_pseudo_header   ipv4_pseudo_header_t;
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     */
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     */
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    uint32_t    source_address;
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    uint32_t    source_address;
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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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    /** Zero byte.
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    /** Reserved byte.
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     *  Must be zero.
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     */
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     */
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    uint8_t     zero;
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    uint8_t     reserved;
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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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    /** Data length is the length of the datagram, measured in octets.
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    /** Data length is the length of the datagram, measured in octets.
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     */
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     */