source: rtems/cpukit/libnetworking/netinet/ip.h @ 4bf1801

4.104.114.84.95
Last change on this file since 4bf1801 was 39e6e65a, checked in by Joel Sherrill <joel.sherrill@…>, on 08/19/98 at 21:32:28

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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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *      This product includes software developed by the University of
16 *      California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *      @(#)ip.h        8.2 (Berkeley) 6/1/94
34 *      $Id$
35 */
36
37#ifndef _NETINET_IP_H_
38#define _NETINET_IP_H_
39
40/*
41 * Definitions for internet protocol version 4.
42 * Per RFC 791, September 1981.
43 */
44#define IPVERSION       4
45
46/*
47 * Structure of an internet header, naked of options.
48 *
49 * We declare ip_len and ip_off to be short, rather than u_short
50 * pragmatically since otherwise unsigned comparisons can result
51 * against negative integers quite easily, and fail in subtle ways.
52 */
53struct ip {
54#ifdef _IP_VHL
55        u_char  ip_vhl;                 /* version << 4 | header length >> 2 */
56#else
57#if BYTE_ORDER == LITTLE_ENDIAN
58        u_char  ip_hl:4,                /* header length */
59                ip_v:4;                 /* version */
60#endif
61#if BYTE_ORDER == BIG_ENDIAN
62        u_char  ip_v:4,                 /* version */
63                ip_hl:4;                /* header length */
64#endif
65#endif /* not _IP_VHL */
66        u_char  ip_tos;                 /* type of service */
67        u_short ip_len;                 /* total length */
68        u_short ip_id;                  /* identification */
69        u_short ip_off;                 /* fragment offset field */
70#define IP_RF 0x8000                    /* reserved fragment flag */
71#define IP_DF 0x4000                    /* dont fragment flag */
72#define IP_MF 0x2000                    /* more fragments flag */
73#define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
74        u_char  ip_ttl;                 /* time to live */
75        u_char  ip_p;                   /* protocol */
76        u_short ip_sum;                 /* checksum */
77        struct  in_addr ip_src,ip_dst;  /* source and dest address */
78};
79
80#ifdef _IP_VHL
81#define IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))
82#define IP_VHL_HL(vhl)          ((vhl) & 0x0f)
83#define IP_VHL_V(vhl)           ((vhl) >> 4)
84#define IP_VHL_BORING           0x45
85#endif
86
87#define IP_MAXPACKET    65535           /* maximum packet size */
88
89/*
90 * Definitions for IP type of service (ip_tos)
91 */
92#define IPTOS_LOWDELAY          0x10
93#define IPTOS_THROUGHPUT        0x08
94#define IPTOS_RELIABILITY       0x04
95#define IPTOS_MINCOST           0x02
96
97/*
98 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
99 */
100#define IPTOS_PREC_NETCONTROL           0xe0
101#define IPTOS_PREC_INTERNETCONTROL      0xc0
102#define IPTOS_PREC_CRITIC_ECP           0xa0
103#define IPTOS_PREC_FLASHOVERRIDE        0x80
104#define IPTOS_PREC_FLASH                0x60
105#define IPTOS_PREC_IMMEDIATE            0x40
106#define IPTOS_PREC_PRIORITY             0x20
107#define IPTOS_PREC_ROUTINE              0x00
108
109/*
110 * Definitions for options.
111 */
112#define IPOPT_COPIED(o)         ((o)&0x80)
113#define IPOPT_CLASS(o)          ((o)&0x60)
114#define IPOPT_NUMBER(o)         ((o)&0x1f)
115
116#define IPOPT_CONTROL           0x00
117#define IPOPT_RESERVED1         0x20
118#define IPOPT_DEBMEAS           0x40
119#define IPOPT_RESERVED2         0x60
120
121#define IPOPT_EOL               0               /* end of option list */
122#define IPOPT_NOP               1               /* no operation */
123
124#define IPOPT_RR                7               /* record packet route */
125#define IPOPT_TS                68              /* timestamp */
126#define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
127#define IPOPT_LSRR              131             /* loose source route */
128#define IPOPT_SATID             136             /* satnet id */
129#define IPOPT_SSRR              137             /* strict source route */
130#define IPOPT_RA                148             /* router alert */
131
132/*
133 * Offsets to fields in options other than EOL and NOP.
134 */
135#define IPOPT_OPTVAL            0               /* option ID */
136#define IPOPT_OLEN              1               /* option length */
137#define IPOPT_OFFSET            2               /* offset within option */
138#define IPOPT_MINOFF            4               /* min value of above */
139
140/*
141 * Time stamp option structure.
142 */
143struct  ip_timestamp {
144        u_char  ipt_code;               /* IPOPT_TS */
145        u_char  ipt_len;                /* size of structure (variable) */
146        u_char  ipt_ptr;                /* index of current entry */
147#if BYTE_ORDER == LITTLE_ENDIAN
148        u_char  ipt_flg:4,              /* flags, see below */
149                ipt_oflw:4;             /* overflow counter */
150#endif
151#if BYTE_ORDER == BIG_ENDIAN
152        u_char  ipt_oflw:4,             /* overflow counter */
153                ipt_flg:4;              /* flags, see below */
154#endif
155        union ipt_timestamp {
156                n_long  ipt_time[1];
157                struct  ipt_ta {
158                        struct in_addr ipt_addr;
159                        n_long ipt_time;
160                } ipt_ta[1];
161        } ipt_timestamp;
162};
163
164#include <machine/in_cksum.h>
165
166/* flag bits for ipt_flg */
167#define IPOPT_TS_TSONLY         0               /* timestamps only */
168#define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
169#define IPOPT_TS_PRESPEC        3               /* specified modules only */
170
171/* bits for security (not byte swapped) */
172#define IPOPT_SECUR_UNCLASS     0x0000
173#define IPOPT_SECUR_CONFID      0xf135
174#define IPOPT_SECUR_EFTO        0x789a
175#define IPOPT_SECUR_MMMM        0xbc4d
176#define IPOPT_SECUR_RESTR       0xaf13
177#define IPOPT_SECUR_SECRET      0xd788
178#define IPOPT_SECUR_TOPSECRET   0x6bc5
179
180/*
181 * Internet implementation parameters.
182 */
183#define MAXTTL          255             /* maximum time to live (seconds) */
184#define IPDEFTTL        64              /* default ttl, from RFC 1340 */
185#define IPFRAGTTL       60              /* time to live for frags, slowhz */
186#define IPTTLDEC        1               /* subtracted when forwarding */
187
188#define IP_MSS          576             /* default maximum segment size */
189
190#endif
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