WebSVN – HelenOS – Diff – /branches/network/uspace/srv/net/il/ip/ip_header.h


/*
 * Copyright (c) 2009 Lukas Mejdrech
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup ip
 *  @{
 */
 
/** @file
 *  IP header and options definitions.
 *  Based on the RFC~791.
 */
 
#ifndef __NET_IP_HEADER_H__
#define __NET_IP_HEADER_H__
 
#include <byteorder.h>
#include <sys/types.h>
 
/** Returns the actual IP header length.
 *  @param header The IP packet header. Input parameter.
 */
#define IP_HEADER_LENGTH( header )      (( header )->header_length * 4u )
 
/** Returns the actual IP header length.
 *  @param header The IP packet header. Input parameter.
 */
#define IP_COMPUTE_HEADER_LENGTH( length )      (( uint8_t ) (( length ) / 4u ))
 
/** Returns the actual IP packet total length.
 *  @param header The IP packet header. Input parameter.
 */
#define IP_TOTAL_LENGTH( header )       ntohs(( header )->total_length )
 
/** Returns the actual IP packet data length.
 *  @param header The IP packet header. Input parameter.
 */
#define IP_HEADER_DATA_LENGTH( header ) ( IP_TOTAL_LENGTH( header ) - IP_HEADER_LENGTH( header ))
 
/** Returns the IP packet header checksum.
 *  @param header The IP packet header. Input parameter.
 */
#define IP_HEADER_CHECKSUM( header )    ( htons( ip_checksum(( uint8_t * )( header ), IP_HEADER_LENGTH( header ))))
 
/** Returns the fragment offest.
 *  @param header The IP packet header. Input parameter.
 */
#define IP_FRAGMENT_OFFSET( header ) (((( header )->fragment_offset_high << 8 ) + ( header )->fragment_offset_low ) * 8u )
 
/** Returns the fragment offest high bits.
 *  @param length The prefixed data total length. Input parameter.
 */
#define IP_COMPUTE_FRAGMENT_OFFSET_HIGH( length ) (((( length ) / 8u ) & 0x1F00 ) >> 8 )
 
/** Returns the fragment offest low bits.
 *  @param length The prefixed data total length. Input parameter.
 */
#define IP_COMPUTE_FRAGMENT_OFFSET_LOW( length ) ((( length ) / 8u ) & 0xFF )
 
/** Type definition of the internet header.
 *  @see ip_header
 */
typedef struct ip_header    ip_header_t;
 
/** Type definition of the internet header pointer.
 *  @see ip_header
 */
typedef ip_header_t *       ip_header_ref;
 
/** Internet header.
 *  The variable options should be included after the header itself and indicated by the increased header length value.
 */
struct ip_header{
#ifdef ARCH_IS_BIG_ENDIAN
    /** The Version field indicates the format of the internet header.
     */
    uint8_t     version:4;
    /** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.
     *  Note that the minimum value for a~correct header is~5.
     */
    uint8_t     header_length:4;
#else
    /** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.
     *  Note that the minimum value for a~correct header is~5.
     */
    uint8_t     header_length:4;
    /** The Version field indicates the format of the internet header.
     */
    uint8_t     version:4;
#endif
    /** The Type of Service provides an indication of the abstract parameters of the quality of service desired.
     *  These parameters are to be used to guide the selection of the actual service parameters when transmitting a~datagram through a~particular network.
     *  Several networks offer service precedence, which somehow treats high precedence traffic as more important than other traffic (generally by accepting only traffic above a~certain precedence at time of high load).
     *  The major choice is a~three way tradeoff between low-delay, high-reliability, and high-throughput.
     */
    uint8_t     tos;
    /** Total Length is the length of the datagram, measured in octets, including internet header and data.
     *  This field allows the length of a~datagram to be up to 65,535~octets.
     */
    uint16_t    total_length;
    /** An identifying value assigned by the sender to aid in assembling the fragments of a~datagram.
     */
    uint16_t    identification;
#ifdef ARCH_IS_BIG_ENDIAN
    /** Various control flags.
 
     */
    uint8_t flags:3;
    /** This field indicates where in the datagram this fragment belongs.
     *  High bits.
     */
    uint8_t fragment_offset_high:5;
#else
    /** This field indicates where in the datagram this fragment belongs.
     *  High bits.
     */
    uint8_t fragment_offset_high:5;
    /** Various control flags.
     */
    uint8_t flags:3;
#endif
    /** This field indicates where in the datagram this fragment belongs.
     *  Low bits.
     */
    uint8_t fragment_offset_low;
    /** This field indicates the maximum time the datagram is allowed to remain in the internet system.
     *  If this field contains the value zero, then the datagram must be destroyed.
     *  This field is modified in internet header processing.
     *  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.
     *  The intention is to cause undeliverable datagrams to be discarded, and to bound the maximum datagram lifetime.
     */
    uint8_t     ttl;
    /** This field indicates the next level protocol used in the data portion of the internet datagram.
     */
    uint8_t     protocol;
    /** A checksum of the header only.
     *  Since some header fields change (e.g., time to live), this is recomputed and verified at each point that the internet header is processed.
     *  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.
     *  For purposes of computing the checksum, the value of the checksum field is zero.
     */
    uint16_t    header_checksum;
    /** The source address.
     */
    uint32_t    source_address;
    /** The destination address.
     */
    uint32_t    destination_address;
} __attribute__ ((packed));
 
/** Type definition of the internet option header.
 *  @see ip_header
 */
typedef struct ip_option    ip_option_t;
 
/** Type definition of the internet option header pointer.
 *  @see ip_header
 */
typedef ip_option_t *       ip_option_ref;
 
/** Internet option header.
 *  Only type field is always valid.
 *  Other fields' validity depends on the option type.
 */
struct ip_option{
    /** A single octet of option-type.
     */
    uint8_t     type;
    /** An option length octet.
     */
    uint8_t     length;
    /** A~pointer.
     */
    uint8_t     pointer;
#ifdef ARCH_IS_BIG_ENDIAN
    /** The number of IP modules that cannot register timestamps due to lack of space.
     */
    uint8_t overflow:4;
    /** Various internet timestamp control flags.
     */
    uint8_t flags:4;
#else
    /** Various internet timestamp control flags.
     */
    uint8_t flags:4;
    /** The number of IP modules that cannot register timestamps due to lack of space.
     */
    uint8_t overflow:4;
#endif
} __attribute__ ((packed));
 
/** @name IP flags definitions
 */
/*@{*/
 
/** Fragment flag field shift.
 */
#define IPFLAG_FRAGMENT_SHIFT       1
 
/** Fragmented flag field shift.
 */
#define IPFLAG_FRAGMENTED_SHIFT     0
 
/** May fragment flag value.
 *  Allows the packet fragmentation.
 */
#define IPFLAG_MAY_FRAGMENT         ( 0x0 << IPFLAG_FRAGMENT_SHIFT )
 
/** Don't fragment flag value.
 *  Permits the packet fragmentation.
 */
#define IPFLAG_DONT_FRAGMENT        ( 0x1 << IPFLAG_FRAGMENT_SHIFT )
 
/** Last fragment flag value.
 *  Indicates the last packet fragment.
 */
#define IPFLAG_LAST_FRAGMENT        ( 0x0 << IPFLAG_FRAGMENTED_SHIFT )
 
/** More fragments flag value.
 *  Indicates that more packet fragments follow.
 */
#define IPFLAG_MORE_FRAGMENTS       ( 0x1 << IPFLAG_FRAGMENTED_SHIFT )
 
/*@}*/
 
/** Type definition of the internet version 4 pseudo header.
 *  @see ipv4_pseudo_header
 */
typedef struct ipv4_pseudo_header   ipv4_pseudo_header_t;
 
/** Type definition of the internet version 4 pseudo header pointer.
 *  @see ipv4_pseudo_header
 */
typedef ipv4_pseudo_header_t *      ipv4_pseudo_header_ref;
 
/** Internet version 4 pseudo header.
 */
struct ipv4_pseudo_header{
    /** The source address.
     */
    uint32_t    source_address;
    /** The destination address.
     */
    uint32_t    destination_address;
    /** Reserved byte.
     *  Must be zero.
     */
    uint8_t     reserved;
    /** This field indicates the next level protocol used in the data portion of the internet datagram.
     */
    uint8_t     protocol;
    /** Data length is the length of the datagram, measured in octets.
     */
    uint16_t    data_length;
} __attribute__ ((packed));
 
#endif
 
/** @}
 */
 

Rev 4728	Rev 4731
1	/*	1	/*
2	* Copyright (c) 2009 Lukas Mejdrech	2	* Copyright (c) 2009 Lukas Mejdrech
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup ip	29	/** @addtogroup ip
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/** @file	33	/** @file
34	* IP header and options definitions.	34	* IP header and options definitions.
35	* Based on the RFC~791.	35	* Based on the RFC~791.
36	*/	36	*/
37		37
38	#ifndef __NET_IP_HEADER_H__	38	#ifndef __NET_IP_HEADER_H__
39	#define __NET_IP_HEADER_H__	39	#define __NET_IP_HEADER_H__
40		40
41	#include <byteorder.h>	41	#include <byteorder.h>
42	#include <sys/types.h>	42	#include <sys/types.h>
43		43
44	/** Returns the actual IP header length.	44	/** Returns the actual IP header length.
45	* @param header The IP packet header. Input parameter.	45	* @param header The IP packet header. Input parameter.
46	*/	46	*/
47	#define IP_HEADER_LENGTH( header ) (( header )->header_length * 4u )	47	#define IP_HEADER_LENGTH( header ) (( header )->header_length * 4u )
48		48
49	/** Returns the actual IP header length.	49	/** Returns the actual IP header length.
50	* @param header The IP packet header. Input parameter.	50	* @param header The IP packet header. Input parameter.
51	*/	51	*/
52	#define IP_COMPUTE_HEADER_LENGTH( length ) (( uint8_t ) (( length ) / 4u ))	52	#define IP_COMPUTE_HEADER_LENGTH( length ) (( uint8_t ) (( length ) / 4u ))
53		53
54	/** Returns the actual IP packet total length.	54	/** Returns the actual IP packet total length.
55	* @param header The IP packet header. Input parameter.	55	* @param header The IP packet header. Input parameter.
56	*/	56	*/
57	#define IP_TOTAL_LENGTH( header ) ntohs(( header )->total_length )	57	#define IP_TOTAL_LENGTH( header ) ntohs(( header )->total_length )
58		58
59	/** Returns the actual IP packet data length.	59	/** Returns the actual IP packet data length.
60	* @param header The IP packet header. Input parameter.	60	* @param header The IP packet header. Input parameter.
61	*/	61	*/
62	#define IP_HEADER_DATA_LENGTH( header ) ( IP_TOTAL_LENGTH( header ) - IP_HEADER_LENGTH( header ))	62	#define IP_HEADER_DATA_LENGTH( header ) ( IP_TOTAL_LENGTH( header ) - IP_HEADER_LENGTH( header ))
63		63
64	/** Returns the IP packet header checksum.	64	/** Returns the IP packet header checksum.
65	* @param header The IP packet header. Input parameter.	65	* @param header The IP packet header. Input parameter.
66	*/	66	*/
67	#define IP_HEADER_CHECKSUM( header ) ( htons( ip_checksum(( uint8_t * )( header ), IP_HEADER_LENGTH( header ))))	67	#define IP_HEADER_CHECKSUM( header ) ( htons( ip_checksum(( uint8_t * )( header ), IP_HEADER_LENGTH( header ))))
68		68
69	/** Returns the fragment offest.	69	/** Returns the fragment offest.
-		70	* @param header The IP packet header. Input parameter.
-		71	*/
-		72	#define IP_FRAGMENT_OFFSET( header ) (((( header )->fragment_offset_high << 8 ) + ( header )->fragment_offset_low ) * 8u )
-		73
-		74	/** Returns the fragment offest high bits.
70	* @param length The prefixed data total length. Input parameter.	75	* @param length The prefixed data total length. Input parameter.
71	*/	76	*/
-		77	#define IP_COMPUTE_FRAGMENT_OFFSET_HIGH( length ) (((( length ) / 8u ) & 0x1F00 ) >> 8 )
-		78
-		79	/** Returns the fragment offest low bits.
-		80	* @param length The prefixed data total length. Input parameter.
-		81	*/
72	#define IP_COMPUTE_FRAGMENT_OFFSET( length ) (( length ) / 8 )	82	#define IP_COMPUTE_FRAGMENT_OFFSET_LOW( length ) ((( length ) / 8u ) & 0xFF )
73		83
74	/** Type definition of the internet header.	84	/** Type definition of the internet header.
75	* @see ip_header	85	* @see ip_header
76	*/	86	*/
77	typedef struct ip_header ip_header_t;	87	typedef struct ip_header ip_header_t;
78		88
79	/** Type definition of the internet header pointer.	89	/** Type definition of the internet header pointer.
80	* @see ip_header	90	* @see ip_header
81	*/	91	*/
82	typedef ip_header_t * ip_header_ref;	92	typedef ip_header_t * ip_header_ref;
83		93
84	/** Internet header.	94	/** Internet header.
85	* The variable options should be included after the header itself and indicated by the increased header length value.	95	* The variable options should be included after the header itself and indicated by the increased header length value.
86	*/	96	*/
87	struct ip_header{	97	struct ip_header{
88	#ifdef ARCH_IS_BIG_ENDIAN	98	#ifdef ARCH_IS_BIG_ENDIAN
89	/** The Version field indicates the format of the internet header.	99	/** The Version field indicates the format of the internet header.
90	*/	100	*/
91	uint8_t version:4;	101	uint8_t version:4;
92	/** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.	102	/** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.
93	* Note that the minimum value for a~correct header is~5.	103	* Note that the minimum value for a~correct header is~5.
94	*/	104	*/
95	uint8_t header_length:4;	105	uint8_t header_length:4;
96	#else	106	#else
97	/** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.	107	/** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.
98	* Note that the minimum value for a~correct header is~5.	108	* Note that the minimum value for a~correct header is~5.
99	*/	109	*/
100	uint8_t header_length:4;	110	uint8_t header_length:4;
101	/** The Version field indicates the format of the internet header.	111	/** The Version field indicates the format of the internet header.
102	*/	112	*/
103	uint8_t version:4;	113	uint8_t version:4;
104	#endif	114	#endif
105	/** The Type of Service provides an indication of the abstract parameters of the quality of service desired.	115	/** The Type of Service provides an indication of the abstract parameters of the quality of service desired.
106	* These parameters are to be used to guide the selection of the actual service parameters when transmitting a~datagram through a~particular network.	116	* These parameters are to be used to guide the selection of the actual service parameters when transmitting a~datagram through a~particular network.
107	* Several networks offer service precedence, which somehow treats high precedence traffic as more important than other traffic (generally by accepting only traffic above a~certain precedence at time of high load).	117	* Several networks offer service precedence, which somehow treats high precedence traffic as more important than other traffic (generally by accepting only traffic above a~certain precedence at time of high load).
108	* The major choice is a~three way tradeoff between low-delay, high-reliability, and high-throughput.	118	* The major choice is a~three way tradeoff between low-delay, high-reliability, and high-throughput.
109	*/	119	*/
110	uint8_t tos;	120	uint8_t tos;
111	/** Total Length is the length of the datagram, measured in octets, including internet header and data.	121	/** Total Length is the length of the datagram, measured in octets, including internet header and data.
112	* This field allows the length of a~datagram to be up to 65,535~octets.	122	* This field allows the length of a~datagram to be up to 65,535~octets.
113	*/	123	*/
114	uint16_t total_length;	124	uint16_t total_length;
115	/** An identifying value assigned by the sender to aid in assembling the fragments of a~datagram.	125	/** An identifying value assigned by the sender to aid in assembling the fragments of a~datagram.
116	*/	126	*/
117	uint16_t identification;	127	uint16_t identification;
118	#ifdef ARCH_IS_BIG_ENDIAN	128	#ifdef ARCH_IS_BIG_ENDIAN
119	/** Various control flags.	129	/** Various control flags.
120	* @see	-
121	*/	130	*/
122	uint16_t flags:3;	131	uint8_t flags:3;
123	/** This field indicates where in the datagram this fragment belongs.	132	/** This field indicates where in the datagram this fragment belongs.
-		133	* High bits.
124	*/	134	*/
125	uint16_t fragment_offset:3;	135	uint8_t fragment_offset_high:5;
126	#else	136	#else
127	/** This field indicates where in the datagram this fragment belongs.	137	/** This field indicates where in the datagram this fragment belongs.
-		138	* High bits.
128	*/	139	*/
129	uint16_t fragment_offset:13;	140	uint8_t fragment_offset_high:5;
130	/** Various control flags.	141	/** Various control flags.
131	*/	142	*/
132	uint16_t flags:3;	143	uint8_t flags:3;
133	#endif	144	#endif
-		145	/** This field indicates where in the datagram this fragment belongs.
-		146	* Low bits.
-		147	*/
-		148	uint8_t fragment_offset_low;
134	/** This field indicates the maximum time the datagram is allowed to remain in the internet system.	149	/** This field indicates the maximum time the datagram is allowed to remain in the internet system.
135	* If this field contains the value zero, then the datagram must be destroyed.	150	* If this field contains the value zero, then the datagram must be destroyed.
136	* This field is modified in internet header processing.	151	* This field is modified in internet header processing.
137	* 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.	152	* 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.
138	* The intention is to cause undeliverable datagrams to be discarded, and to bound the maximum datagram lifetime.	153	* The intention is to cause undeliverable datagrams to be discarded, and to bound the maximum datagram lifetime.
139	*/	154	*/
140	uint8_t ttl;	155	uint8_t ttl;
141	/** This field indicates the next level protocol used in the data portion of the internet datagram.	156	/** This field indicates the next level protocol used in the data portion of the internet datagram.
142	*/	157	*/
143	uint8_t protocol;	158	uint8_t protocol;
144	/** A checksum of the header only.	159	/** A checksum of the header only.
145	* Since some header fields change (e.g., time to live), this is recomputed and verified at each point that the internet header is processed.	160	* Since some header fields change (e.g., time to live), this is recomputed and verified at each point that the internet header is processed.
146	* 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.	161	* 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.
147	* For purposes of computing the checksum, the value of the checksum field is zero.	162	* For purposes of computing the checksum, the value of the checksum field is zero.
148	*/	163	*/
149	uint16_t header_checksum;	164	uint16_t header_checksum;
150	/** The source address.	165	/** The source address.
151	*/	166	*/
152	uint32_t source_address;	167	uint32_t source_address;
153	/** The destination address.	168	/** The destination address.
154	*/	169	*/
155	uint32_t destination_address;	170	uint32_t destination_address;
156	} __attribute__ ((packed));	171	} __attribute__ ((packed));
157		172
158	/** Type definition of the internet option header.	173	/** Type definition of the internet option header.
159	* @see ip_header	174	* @see ip_header
160	*/	175	*/
161	typedef struct ip_option ip_option_t;	176	typedef struct ip_option ip_option_t;
162		177
163	/** Type definition of the internet option header pointer.	178	/** Type definition of the internet option header pointer.
164	* @see ip_header	179	* @see ip_header
165	*/	180	*/
166	typedef ip_option_t * ip_option_ref;	181	typedef ip_option_t * ip_option_ref;
167		182
168	/** Internet option header.	183	/** Internet option header.
169	* Only type field is always valid.	184	* Only type field is always valid.
170	* Other fields' validity depends on the option type.	185	* Other fields' validity depends on the option type.
171	*/	186	*/
172	struct ip_option{	187	struct ip_option{
173	/** A single octet of option-type.	188	/** A single octet of option-type.
174	*/	189	*/
175	uint8_t type;	190	uint8_t type;
176	/** An option length octet.	191	/** An option length octet.
177	*/	192	*/
178	uint8_t length;	193	uint8_t length;
179	/** A~pointer.	194	/** A~pointer.
180	*/	195	*/
181	uint8_t pointer;	196	uint8_t pointer;
182	#ifdef ARCH_IS_BIG_ENDIAN	197	#ifdef ARCH_IS_BIG_ENDIAN
183	/** The number of IP modules that cannot register timestamps due to lack of space.	198	/** The number of IP modules that cannot register timestamps due to lack of space.
184	*/	199	*/
185	uint8_t overflow:4;	200	uint8_t overflow:4;
186	/** Various internet timestamp control flags.	201	/** Various internet timestamp control flags.
187	*/	202	*/
188	uint8_t flags:4;	203	uint8_t flags:4;
189	#else	204	#else
190	/** Various internet timestamp control flags.	205	/** Various internet timestamp control flags.
191	*/	206	*/
192	uint8_t flags:4;	207	uint8_t flags:4;
193	/** The number of IP modules that cannot register timestamps due to lack of space.	208	/** The number of IP modules that cannot register timestamps due to lack of space.
194	*/	209	*/
195	uint8_t overflow:4;	210	uint8_t overflow:4;
196	#endif	211	#endif
197	} __attribute__ ((packed));	212	} __attribute__ ((packed));
198		213
199	/** @name IP flags definitions	214	/** @name IP flags definitions
200	*/	215	*/
201	/@{/	216	/@{/
202		217
203	/** Fragment flag field shift.	218	/** Fragment flag field shift.
204	*/	219	*/
205	#define IPFLAG_FRAGMENT_SHIFT 1	220	#define IPFLAG_FRAGMENT_SHIFT 1
206		221
207	/** Fragmented flag field shift.	222	/** Fragmented flag field shift.
208	*/	223	*/
209	#define IPFLAG_FRAGMENTED_SHIFT 0	224	#define IPFLAG_FRAGMENTED_SHIFT 0
210		225
211	/** May fragment flag value.	226	/** May fragment flag value.
212	* Allows the packet fragmentation.	227	* Allows the packet fragmentation.
213	*/	228	*/
214	#define IPFLAG_MAY_FRAGMENT ( 0x0 << IPFLAG_FRAGMENT_SHIFT )	229	#define IPFLAG_MAY_FRAGMENT ( 0x0 << IPFLAG_FRAGMENT_SHIFT )
215		230
216	/** Don't fragment flag value.	231	/** Don't fragment flag value.
217	* Permits the packet fragmentation.	232	* Permits the packet fragmentation.
218	*/	233	*/
219	#define IPFLAG_DONT_FRAGMENT ( 0x1 << IPFLAG_FRAGMENT_SHIFT )	234	#define IPFLAG_DONT_FRAGMENT ( 0x1 << IPFLAG_FRAGMENT_SHIFT )
220		235
221	/** Last fragment flag value.	236	/** Last fragment flag value.
222	* Indicates the last packet fragment.	237	* Indicates the last packet fragment.
223	*/	238	*/
224	#define IPFLAG_LAST_FRAGMENT ( 0x0 << IPFLAG_FRAGMENTED_SHIFT )	239	#define IPFLAG_LAST_FRAGMENT ( 0x0 << IPFLAG_FRAGMENTED_SHIFT )
225		240
226	/** More fragments flag value.	241	/** More fragments flag value.
227	* Indicates that more packet fragments follow.	242	* Indicates that more packet fragments follow.
228	*/	243	*/
229	#define IPFLAG_MORE_FRAGMENTS ( 0x1 << IPFLAG_FRAGMENTED_SHIFT )	244	#define IPFLAG_MORE_FRAGMENTS ( 0x1 << IPFLAG_FRAGMENTED_SHIFT )
230		245
231	/@}/	246	/@}/
232		247
233	/** Type definition of the internet version 4 pseudo header.	248	/** Type definition of the internet version 4 pseudo header.
234	* @see ipv4_pseudo_header	249	* @see ipv4_pseudo_header
235	*/	250	*/
236	typedef struct ipv4_pseudo_header ipv4_pseudo_header_t;	251	typedef struct ipv4_pseudo_header ipv4_pseudo_header_t;
237		252
238	/** Type definition of the internet version 4 pseudo header pointer.	253	/** Type definition of the internet version 4 pseudo header pointer.
239	* @see ipv4_pseudo_header	254	* @see ipv4_pseudo_header
240	*/	255	*/
241	typedef ipv4_pseudo_header_t * ipv4_pseudo_header_ref;	256	typedef ipv4_pseudo_header_t * ipv4_pseudo_header_ref;
242		257
243	/** Internet version 4 pseudo header.	258	/** Internet version 4 pseudo header.
244	*/	259	*/
245	struct ipv4_pseudo_header{	260	struct ipv4_pseudo_header{
246	/** The source address.	261	/** The source address.
247	*/	262	*/
248	uint32_t source_address;	263	uint32_t source_address;
249	/** The destination address.	264	/** The destination address.
250	*/	265	*/
251	uint32_t destination_address;	266	uint32_t destination_address;
252	/** Reserved byte.	267	/** Reserved byte.
253	* Must be zero.	268	* Must be zero.
254	*/	269	*/
255	uint8_t reserved;	270	uint8_t reserved;
256	/** This field indicates the next level protocol used in the data portion of the internet datagram.	271	/** This field indicates the next level protocol used in the data portion of the internet datagram.
257	*/	272	*/
258	uint8_t protocol;	273	uint8_t protocol;
259	/** Data length is the length of the datagram, measured in octets.	274	/** Data length is the length of the datagram, measured in octets.
260	*/	275	*/
261	uint16_t data_length;	276	uint16_t data_length;
262	} __attribute__ ((packed));	277	} __attribute__ ((packed));
263		278
264	#endif	279	#endif
265		280
266	/** @}	281	/** @}
267	*/	282	*/
268		283

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(root)/branches/network/uspace/srv/net/il/ip/ip_header.h – Rev 4728 → 4731