source: rtems/cpukit/libnetworking/netinet/ip.h @ cf04e8ac

4.104.114.84.9
Last change on this file since cf04e8ac was cf04e8ac, checked in by Joel Sherrill <joel.sherrill@…>, on Sep 1, 2006 at 7:10:01 PM

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1/*
2 * Copyright (c) 1982, 1986, 1993
3 *      The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *      @(#)ip.h        8.2 (Berkeley) 6/1/94
30 * $FreeBSD: src/sys/netinet/ip.h,v 1.29 2005/01/07 01:45:44 imp Exp $
31 */
32
33/*
34 *      $Id$
35 */
36
37#ifndef _NETINET_IP_H_
38#define _NETINET_IP_H_
39
40#include <sys/cdefs.h>
41
42/*
43 * Definitions for internet protocol version 4.
44 * Per RFC 791, September 1981.
45 */
46#define IPVERSION       4
47
48#ifndef __packed
49#if defined(__GNUC__)
50#define __packed __attribute__((packed))
51#else
52#define __packed
53#endif
54#endif
55
56/*
57 * Structure of an internet header, naked of options.
58 */
59struct ip {
60#ifdef _IP_VHL
61        u_char  ip_vhl;                 /* version << 4 | header length >> 2 */
62#else
63#if BYTE_ORDER == LITTLE_ENDIAN
64        u_int   ip_hl:4,                /* header length */
65                ip_v:4;                 /* version */
66#endif
67#if BYTE_ORDER == BIG_ENDIAN
68        u_int   ip_v:4,                 /* version */
69                ip_hl:4;                /* header length */
70#endif
71#endif /* not _IP_VHL */
72        u_char  ip_tos;                 /* type of service */
73        u_short ip_len;                 /* total length */
74        u_short ip_id;                  /* identification */
75        u_short ip_off;                 /* fragment offset field */
76#define IP_RF 0x8000                    /* reserved fragment flag */
77#define IP_DF 0x4000                    /* dont fragment flag */
78#define IP_MF 0x2000                    /* more fragments flag */
79#define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
80        u_char  ip_ttl;                 /* time to live */
81        u_char  ip_p;                   /* protocol */
82        u_short ip_sum;                 /* checksum */
83        struct  in_addr ip_src,ip_dst;  /* source and dest address */
84} __packed;
85
86#ifdef _IP_VHL
87#define IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))
88#define IP_VHL_HL(vhl)          ((vhl) & 0x0f)
89#define IP_VHL_V(vhl)           ((vhl) >> 4)
90#define IP_VHL_BORING           0x45
91#endif
92
93#ifdef CTASSERT
94CTASSERT(sizeof (struct ip) == 20);
95#endif
96
97#define IP_MAXPACKET    65535L          /* maximum packet size */
98
99/*
100 * Definitions for IP type of service (ip_tos)
101 */
102#define IPTOS_LOWDELAY          0x10
103#define IPTOS_THROUGHPUT        0x08
104#define IPTOS_RELIABILITY       0x04
105#define IPTOS_MINCOST           0x02
106#if 1
107/* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
108#define IPTOS_CE                0x01
109#define IPTOS_ECT               0x02
110#endif
111
112/*
113 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
114 */
115#define IPTOS_PREC_NETCONTROL           0xe0
116#define IPTOS_PREC_INTERNETCONTROL      0xc0
117#define IPTOS_PREC_CRITIC_ECP           0xa0
118#define IPTOS_PREC_FLASHOVERRIDE        0x80
119#define IPTOS_PREC_FLASH                0x60
120#define IPTOS_PREC_IMMEDIATE            0x40
121#define IPTOS_PREC_PRIORITY             0x20
122#define IPTOS_PREC_ROUTINE              0x00
123
124/*
125 * ECN (Explicit Congestion Notification) codepoints in RFC3168
126 * mapped to the lower 2 bits of the TOS field.
127 */
128#define IPTOS_ECN_NOTECT        0x00    /* not-ECT */
129#define IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
130#define IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
131#define IPTOS_ECN_CE            0x03    /* congestion experienced */
132#define IPTOS_ECN_MASK          0x03    /* ECN field mask */
133
134/*
135 * Definitions for options.
136 */
137#define IPOPT_COPIED(o)         ((o)&0x80)
138#define IPOPT_CLASS(o)          ((o)&0x60)
139#define IPOPT_NUMBER(o)         ((o)&0x1f)
140
141#define IPOPT_CONTROL           0x00
142#define IPOPT_RESERVED1         0x20
143#define IPOPT_DEBMEAS           0x40
144#define IPOPT_RESERVED2         0x60
145
146#define IPOPT_EOL               0               /* end of option list */
147#define IPOPT_NOP               1               /* no operation */
148
149#define IPOPT_RR                7               /* record packet route */
150#define IPOPT_TS                68              /* timestamp */
151#define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
152#define IPOPT_LSRR              131             /* loose source route */
153#define IPOPT_ESO               133             /* extended security */
154#define IPOPT_CIPSO             134             /* commerical security */
155#define IPOPT_SATID             136             /* satnet id */
156#define IPOPT_SSRR              137             /* strict source route */
157#define IPOPT_RA                148             /* router alert */
158
159/*
160 * Offsets to fields in options other than EOL and NOP.
161 */
162#define IPOPT_OPTVAL            0               /* option ID */
163#define IPOPT_OLEN              1               /* option length */
164#define IPOPT_OFFSET            2               /* offset within option */
165#define IPOPT_MINOFF            4               /* min value of above */
166
167/*
168 * Time stamp option structure.
169 */
170struct  ip_timestamp {
171        u_char  ipt_code;               /* IPOPT_TS */
172        u_char  ipt_len;                /* size of structure (variable) */
173        u_char  ipt_ptr;                /* index of current entry */
174#if BYTE_ORDER == LITTLE_ENDIAN
175        u_int   ipt_flg:4,              /* flags, see below */
176                ipt_oflw:4;             /* overflow counter */
177#endif
178#if BYTE_ORDER == BIG_ENDIAN
179        u_int   ipt_oflw:4,             /* overflow counter */
180                ipt_flg:4;              /* flags, see below */
181#endif
182        union ipt_timestamp {
183                n_long  ipt_time[1];
184                struct  ipt_ta {
185                        struct in_addr ipt_addr;
186                        n_long ipt_time;
187                } ipt_ta[1];
188        } ipt_timestamp;
189};
190
191#include <machine/in_cksum.h>
192
193/* flag bits for ipt_flg */
194#define IPOPT_TS_TSONLY         0               /* timestamps only */
195#define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
196#define IPOPT_TS_PRESPEC        3               /* specified modules only */
197
198/* bits for security (not byte swapped) */
199#define IPOPT_SECUR_UNCLASS     0x0000
200#define IPOPT_SECUR_CONFID      0xf135
201#define IPOPT_SECUR_EFTO        0x789a
202#define IPOPT_SECUR_MMMM        0xbc4d
203#define IPOPT_SECUR_RESTR       0xaf13
204#define IPOPT_SECUR_SECRET      0xd788
205#define IPOPT_SECUR_TOPSECRET   0x6bc5
206
207/*
208 * Internet implementation parameters.
209 */
210#define MAXTTL          255             /* maximum time to live (seconds) */
211#define IPDEFTTL        64              /* default ttl, from RFC 1340 */
212#define IPFRAGTTL       60              /* time to live for frags, slowhz */
213#define IPTTLDEC        1               /* subtracted when forwarding */
214
215#define IP_MSS          576             /* default maximum segment size */
216
217/*
218 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
219 * checksums. For the Internet checksum, struct ipovly can be used instead.
220 * For stronger checksums, the real thing must be used.
221 */
222struct ippseudo {
223        struct  in_addr ippseudo_src;   /* source internet address */
224        struct  in_addr ippseudo_dst;   /* destination internet address */
225        u_char          ippseudo_pad;   /* pad, must be zero */
226        u_char          ippseudo_p;     /* protocol */
227        u_short         ippseudo_len;   /* protocol length */
228};
229#endif
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