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/** @addtogroup ip
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/** @addtogroup ip
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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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 *  Internet protocol 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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 *  Names according to the linux src/include/linux/ip.h header file.
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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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    /** 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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    uint16_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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     */
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     */
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    uint16_t    fragment_offset:3;
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    uint16_t    fragment_offset:3;
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     */
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     */
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    uint8_t overflow:4;
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    uint8_t overflow:4;
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#endif
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#endif
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} __attribute__ ((packed));
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} __attribute__ ((packed));
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- 
 
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/** @name IP flags definitions
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 */
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/*@{*/
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/** Fragment flag field shift.
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 */
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#define IPFLAG_FRAGMENT_SHIFT       1
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#define IPFLAG_FRAGMENT_SHIFT       1
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/** Fragmented flag field shift.
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 */
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#define IPFLAG_FRAGMENTED_SHIFT     0
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#define IPFLAG_FRAGMENTED_SHIFT     0
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- 
 
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/** May fragment flag value.
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 *  Allows the packet fragmentation.
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 */
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#define IPFLAG_MAY_FRAGMENT         ( 0x0 << IPFLAG_FRAGMENT_SHIFT )
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#define IPFLAG_MAY_FRAGMENT         ( 0x0 << IPFLAG_FRAGMENT_SHIFT )
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/** Don't fragment flag value.
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 *  Permits the packet fragmentation.
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 */
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#define IPFLAG_DONT_FRAGMENT        ( 0x1 << IPFLAG_FRAGMENT_SHIFT )
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#define IPFLAG_DONT_FRAGMENT        ( 0x1 << IPFLAG_FRAGMENT_SHIFT )
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- 
 
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/** Last fragment flag value.
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 *  Indicates the last packet fragment.
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 */
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#define IPFLAG_LAST_FRAGMENT        ( 0x0 << IPFLAG_FRAGMENTED_SHIFT )
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#define IPFLAG_LAST_FRAGMENT        ( 0x0 << IPFLAG_FRAGMENTED_SHIFT )
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/** More fragments flag value.
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 *  Indicates that more packet fragments follow.
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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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/*
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#define IPOPT_OPTVAL 0
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#define IPOPT_OPTVAL 0
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#define IPOPT_OLEN   1
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#define IPOPT_OLEN   1
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#define IPOPT_OFFSET 2
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#define IPOPT_OFFSET 2
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#define IPOPT_MINOFF 4
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#define IPOPT_MINOFF 4