FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip.h
1 /* $NetBSD: ip.h,v 1.39 2022/04/17 21:24:53 andvar Exp $ */
2
3 /*
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)ip.h 8.2 (Berkeley) 6/1/94
32 */
33
34 #ifndef _NETINET_IP_H_
35 #define _NETINET_IP_H_
36
37 #include <sys/types.h>
38
39 #include <netinet/in.h>
40 #include <netinet/in_systm.h> /* for n_time */
41
42 /*
43 * Definitions for internet protocol version 4.
44 * Per RFC 791, September 1981.
45 */
46 #define IPVERSION 4
47
48 /*
49 * Structure of an internet header, naked of options.
50 */
51 struct ip {
52 #if BYTE_ORDER == LITTLE_ENDIAN
53 unsigned int ip_hl:4, /* header length */
54 ip_v:4; /* version */
55 #endif
56 #if BYTE_ORDER == BIG_ENDIAN
57 unsigned int ip_v:4, /* version */
58 ip_hl:4; /* header length */
59 #endif
60 u_int8_t ip_tos; /* type of service */
61 u_int16_t ip_len; /* total length */
62 u_int16_t ip_id; /* identification */
63 u_int16_t ip_off; /* fragment offset field */
64 #define IP_RF 0x8000 /* reserved fragment flag */
65 #define IP_EF 0x8000 /* evil flag, per RFC 3514 */
66 #define IP_DF 0x4000 /* dont fragment flag */
67 #define IP_MF 0x2000 /* more fragments flag */
68 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
69 u_int8_t ip_ttl; /* time to live */
70 u_int8_t ip_p; /* protocol */
71 u_int16_t ip_sum; /* checksum */
72 struct in_addr ip_src, ip_dst; /* source and dest address */
73 };
74
75 #define IP_MAXPACKET 65535 /* maximum packet size */
76 #define IP_MINFRAGSIZE 69 /* minimum size that can be fraged */
77
78 /*
79 * Definitions for IP type of service (ip_tos)
80 */
81
82 /*
83 * Definitions for DiffServ Codepoints as per RFC2474
84 */
85 #define IPTOS_DSCP_CS0 0x00
86 #define IPTOS_DSCP_CS1 0x20
87 #define IPTOS_DSCP_AF11 0x28
88 #define IPTOS_DSCP_AF12 0x30
89 #define IPTOS_DSCP_AF13 0x38
90 #define IPTOS_DSCP_CS2 0x40
91 #define IPTOS_DSCP_AF21 0x48
92 #define IPTOS_DSCP_AF22 0x50
93 #define IPTOS_DSCP_AF23 0x58
94 #define IPTOS_DSCP_CS3 0x60
95 #define IPTOS_DSCP_AF31 0x68
96 #define IPTOS_DSCP_AF32 0x70
97 #define IPTOS_DSCP_AF33 0x78
98 #define IPTOS_DSCP_CS4 0x80
99 #define IPTOS_DSCP_AF41 0x88
100 #define IPTOS_DSCP_AF42 0x90
101 #define IPTOS_DSCP_AF43 0x98
102 #define IPTOS_DSCP_CS5 0xa0
103 #define IPTOS_DSCP_EF 0xb8
104 #define IPTOS_DSCP_CS6 0xc0
105 #define IPTOS_DSCP_CS7 0xe0
106
107 /*
108 * Definitions for DiffServ Class Selector Codepoints
109 */
110 #define IPTOS_CLASS_CS0 0x00
111 #define IPTOS_CLASS_CS1 0x20
112 #define IPTOS_CLASS_CS2 0x40
113 #define IPTOS_CLASS_CS3 0x60
114 #define IPTOS_CLASS_CS4 0x80
115 #define IPTOS_CLASS_CS5 0xa0
116 #define IPTOS_CLASS_CS6 0xc0
117 #define IPTOS_CLASS_CS7 0xe0
118 #define IPTOS_CLASS_DEFAULT IPTOS_CLASS_CS0
119 #define IPTOS_CLASS_MASK 0xe0
120 #define IPTOS_CLASS(cs) ((cs) & IPTOS_CLASS_MASK)
121 #define IPTOS_DSCP_MASK 0xfc
122 #define IPTOS_DSCP(cp) ((cp) & IPTOS_DSCP_MASK)
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 #define IPTOS_ECN(cn) ((cn) & IPTOS_ECN_MASK)
134 #define IPTOS_ECN_NOT_ECT 0x00
135
136 /*
137 * Definitions for IP type of service per RFC1349 (ip_tos)
138 * DEPRECATED
139 */
140 #define IPTOS_LOWDELAY 0x10
141 #define IPTOS_THROUGHPUT 0x08
142 #define IPTOS_RELIABILITY 0x04
143 #define IPTOS_MINCOST 0x02
144 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
145 #define IPTOS_CE 0x01 /* congestion experienced */
146 #define IPTOS_ECT 0x02 /* ECN-capable transport */
147
148 /*
149 * Definitions for IP precedence per RFC1195 (also in ip_tos) (hopefully unused)
150 */
151 #define IPTOS_PREC_NETCONTROL 0xe0
152 #define IPTOS_PREC_INTERNETCONTROL 0xc0
153 #define IPTOS_PREC_CRITIC_ECP 0xa0
154 #define IPTOS_PREC_FLASHOVERRIDE 0x80
155 #define IPTOS_PREC_FLASH 0x60
156 #define IPTOS_PREC_IMMEDIATE 0x40
157 #define IPTOS_PREC_PRIORITY 0x20
158 #define IPTOS_PREC_ROUTINE 0x00
159
160 /*
161 * Definitions for options.
162 */
163 #define IPOPT_COPIED(o) ((o)&0x80)
164 #define IPOPT_CLASS(o) ((o)&0x60)
165 #define IPOPT_NUMBER(o) ((o)&0x1f)
166
167 #define IPOPT_CONTROL 0x00
168 #define IPOPT_RESERVED1 0x20
169 #define IPOPT_DEBMEAS 0x40
170 #define IPOPT_RESERVED2 0x60
171
172 #define IPOPT_EOL 0 /* end of option list */
173 #define IPOPT_NOP 1 /* no operation */
174
175 #define IPOPT_RR 7 /* record packet route */
176 #define IPOPT_TS 68 /* timestamp */
177 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
178 #define IPOPT_LSRR 131 /* loose source route */
179 #define IPOPT_SATID 136 /* satnet id */
180 #define IPOPT_SSRR 137 /* strict source route */
181
182 /*
183 * Offsets to fields in options other than EOL and NOP.
184 */
185 #define IPOPT_OPTVAL 0 /* option ID */
186 #define IPOPT_OLEN 1 /* option length */
187 #define IPOPT_OFFSET 2 /* offset within option */
188 #define IPOPT_MINOFF 4 /* min value of above */
189
190 /*
191 * Time stamp option structure.
192 */
193 struct ip_timestamp {
194 u_int8_t ipt_code; /* IPOPT_TS */
195 u_int8_t ipt_len; /* size of structure (variable) */
196 u_int8_t ipt_ptr; /* index of current entry */
197 #if BYTE_ORDER == LITTLE_ENDIAN
198 unsigned int ipt_flg:4, /* flags, see below */
199 ipt_oflw:4; /* overflow counter */
200 #endif
201 #if BYTE_ORDER == BIG_ENDIAN
202 unsigned int ipt_oflw:4, /* overflow counter */
203 ipt_flg:4; /* flags, see below */
204 #endif
205 union ipt_timestamp {
206 n_time ipt_time[1];
207 struct ipt_ta {
208 struct in_addr ipt_addr;
209 n_time ipt_time;
210 } ipt_ta[1];
211 } ipt_timestamp;
212 };
213
214 /* flag bits for ipt_flg */
215 #define IPOPT_TS_TSONLY 0 /* timestamps only */
216 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
217 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
218
219 /* bits for security (not byte swapped) */
220 #define IPOPT_SECUR_UNCLASS 0x0000
221 #define IPOPT_SECUR_CONFID 0xf135
222 #define IPOPT_SECUR_EFTO 0x789a
223 #define IPOPT_SECUR_MMMM 0xbc4d
224 #define IPOPT_SECUR_RESTR 0xaf13
225 #define IPOPT_SECUR_SECRET 0xd788
226 #define IPOPT_SECUR_TOPSECRET 0x6bc5
227
228 /*
229 * Internet implementation parameters.
230 */
231 #define MAXTTL 255 /* maximum time to live (seconds) */
232 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
233 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
234 #define IPTTLDEC 1 /* subtracted when forwarding */
235
236 #define IP_MSS 576 /* default maximum segment size */
237
238 /*
239 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
240 * checksums. For the Internet checksum, struct ipovly can be used instead.
241 * For stronger checksums, the real thing must be used.
242 */
243 struct ippseudo {
244 struct in_addr ippseudo_src; /* source internet address */
245 struct in_addr ippseudo_dst; /* destination internet address */
246 u_int8_t ippseudo_pad; /* pad, must be zero */
247 u_int8_t ippseudo_p; /* protocol */
248 u_int16_t ippseudo_len; /* protocol length */
249 };
250
251 #ifdef __CTASSERT
252 __CTASSERT(sizeof(struct ip) == 20);
253 __CTASSERT(sizeof(struct ip_timestamp) == 12);
254 __CTASSERT(sizeof(struct ippseudo) == 12);
255 #endif
256
257 #endif /* !_NETINET_IP_H_ */
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