1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef _NETINET_IP_H_
34#define _NETINET_IP_H_
35
36#include <sys/types.h>
37#include <netinet/in.h>
38
39/*
40 * Definitions for internet protocol version 4.
41 *
42 * Per RFC 791, September 1981.
43 */
44#define IPVERSION 4
45
46/*
47 * Structure of an internet header, naked of options.
48 */
49struct ip {
50#if BYTE_ORDER == LITTLE_ENDIAN
51 u_char ip_hl:4, /* header length */
52 ip_v:4; /* version */
53#endif
54#if BYTE_ORDER == BIG_ENDIAN
55 u_char ip_v:4, /* version */
56 ip_hl:4; /* header length */
57#endif
58 u_char ip_tos; /* type of service */
59 u_short ip_len; /* total length */
60 u_short ip_id; /* identification */
61 u_short ip_off; /* fragment offset field */
62#define IP_RF 0x8000 /* reserved fragment flag */
63#define IP_DF 0x4000 /* dont fragment flag */
64#define IP_MF 0x2000 /* more fragments flag */
65#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
66 u_char ip_ttl; /* time to live */
67 u_char ip_p; /* protocol */
68 u_short ip_sum; /* checksum */
69 struct in_addr ip_src,ip_dst; /* source and dest address */
70} __packed;
71
72#define IP_MAXPACKET 65535 /* maximum packet size */
73
74/*
75 * Definitions for IP type of service (ip_tos).
76 */
77#define IPTOS_LOWDELAY 0x10
78#define IPTOS_THROUGHPUT 0x08
79#define IPTOS_RELIABILITY 0x04
80#define IPTOS_MINCOST IPTOS_DSCP_CS0
81
82/*
83 * Definitions for IP precedence (also in ip_tos) (deprecated).
84 */
85#define IPTOS_PREC_NETCONTROL IPTOS_DSCP_CS7
86#define IPTOS_PREC_INTERNETCONTROL IPTOS_DSCP_CS6
87#define IPTOS_PREC_CRITIC_ECP IPTOS_DSCP_CS5
88#define IPTOS_PREC_FLASHOVERRIDE IPTOS_DSCP_CS4
89#define IPTOS_PREC_FLASH IPTOS_DSCP_CS3
90#define IPTOS_PREC_IMMEDIATE IPTOS_DSCP_CS2
91#define IPTOS_PREC_PRIORITY IPTOS_DSCP_CS1
92#define IPTOS_PREC_ROUTINE IPTOS_DSCP_CS0
93
94/*
95 * Offset of Diffserv decimal value to convert it to tos value .
96 */
97#define IPTOS_DSCP_OFFSET 2
98
99/*
100 * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865.
101 */
102#define IPTOS_DSCP_CS0 0x00
103#define IPTOS_DSCP_CS1 0x20
104#define IPTOS_DSCP_AF11 0x28
105#define IPTOS_DSCP_AF12 0x30
106#define IPTOS_DSCP_AF13 0x38
107#define IPTOS_DSCP_CS2 0x40
108#define IPTOS_DSCP_AF21 0x48
109#define IPTOS_DSCP_AF22 0x50
110#define IPTOS_DSCP_AF23 0x58
111#define IPTOS_DSCP_CS3 0x60
112#define IPTOS_DSCP_AF31 0x68
113#define IPTOS_DSCP_AF32 0x70
114#define IPTOS_DSCP_AF33 0x78
115#define IPTOS_DSCP_CS4 0x80
116#define IPTOS_DSCP_AF41 0x88
117#define IPTOS_DSCP_AF42 0x90
118#define IPTOS_DSCP_AF43 0x98
119#define IPTOS_DSCP_CS5 0xa0
120#define IPTOS_DSCP_VA 0xb0
121#define IPTOS_DSCP_EF 0xb8
122#define IPTOS_DSCP_CS6 0xc0
123#define IPTOS_DSCP_CS7 0xe0
124
125/*
126 * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the
127 * lower 2 bits of the TOS field.
128 */
129#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
130#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
131#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
132#define IPTOS_ECN_CE 0x03 /* congestion experienced */
133#define IPTOS_ECN_MASK 0x03 /* ECN field mask */
134
135/*
136 * Definitions for options.
137 */
138#define IPOPT_COPIED(o) ((o)&0x80)
139#define IPOPT_CLASS(o) ((o)&0x60)
140#define IPOPT_NUMBER(o) ((o)&0x1f)
141
142#define IPOPT_CONTROL 0x00
143#define IPOPT_RESERVED1 0x20
144#define IPOPT_DEBMEAS 0x40
145#define IPOPT_RESERVED2 0x60
146
147#define IPOPT_EOL 0 /* end of option list */
148#define IPOPT_NOP 1 /* no operation */
149
150#define IPOPT_RR 7 /* record packet route */
151#define IPOPT_TS 68 /* timestamp */
152#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
153#define IPOPT_LSRR 131 /* loose source route */
154#define IPOPT_ESO 133 /* extended security */
155#define IPOPT_CIPSO 134 /* commercial security */
156#define IPOPT_SATID 136 /* satnet id */
157#define IPOPT_SSRR 137 /* strict source route */
158#define IPOPT_RA 148 /* router alert */
159
160/*
161 * Offsets to fields in options other than EOL and NOP.
162 */
163#define IPOPT_OPTVAL 0 /* option ID */
164#define IPOPT_OLEN 1 /* option length */
165#define IPOPT_OFFSET 2 /* offset within option */
166#define IPOPT_MINOFF 4 /* min value of above */
167
168/*
169 * Time stamp option structure.
170 */
171struct ip_timestamp {
172 u_char ipt_code; /* IPOPT_TS */
173 u_char ipt_len; /* size of structure (variable) */
174 u_char ipt_ptr; /* index of current entry */
175#if BYTE_ORDER == LITTLE_ENDIAN
176 u_char ipt_flg:4, /* flags, see below */
177 ipt_oflw:4; /* overflow counter */
178#endif
179#if BYTE_ORDER == BIG_ENDIAN
180 u_char ipt_oflw:4, /* overflow counter */
181 ipt_flg:4; /* flags, see below */
182#endif
183 union ipt_timestamp {
184 uint32_t ipt_time[1]; /* network format */
185 struct ipt_ta {
186 struct in_addr ipt_addr;
187 uint32_t ipt_time; /* network format */
188 } ipt_ta[1];
189 } ipt_timestamp;
190} __packed;
191
192/* Flag bits for ipt_flg. */
193#define IPOPT_TS_TSONLY 0 /* timestamps only */
194#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
195#define IPOPT_TS_PRESPEC 3 /* specified modules only */
196
197/* Bits for security (not byte swapped). */
198#define IPOPT_SECUR_UNCLASS 0x0000
199#define IPOPT_SECUR_CONFID 0xf135
200#define IPOPT_SECUR_EFTO 0x789a
201#define IPOPT_SECUR_MMMM 0xbc4d
202#define IPOPT_SECUR_RESTR 0xaf13
203#define IPOPT_SECUR_SECRET 0xd788
204#define IPOPT_SECUR_TOPSECRET 0x6bc5
205
206/*
207 * Internet implementation parameters.
208 */
209#define MAXTTL 255 /* maximum time to live (seconds) */
210#define IPDEFTTL 64 /* default ttl, from RFC 1340 */
211#define IPTTLDEC 1 /* subtracted when forwarding */
212#define IP_MSS 576 /* default maximum segment size */
213
214/*
215 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
216 * checksums. For the Internet checksum, struct ipovly can be used instead.
217 * For stronger checksums, the real thing must be used.
218 */
219struct ippseudo {
220 struct in_addr ippseudo_src; /* source internet address */
221 struct in_addr ippseudo_dst; /* destination internet address */
222 u_char ippseudo_pad; /* pad, must be zero */
223 u_char ippseudo_p; /* protocol */
224 u_short ippseudo_len; /* protocol length */
225};
226#endif