FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip.h
1 /* $OpenBSD: ip.h,v 1.20 2021/12/14 23:47:36 dtucker Exp $ */
2 /* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */
3
4 /*
5 * Copyright (c) 1982, 1986, 1993
6 * The Regents of the University of California. 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 * @(#)ip.h 8.1 (Berkeley) 6/10/93
33 */
34
35 #ifndef _NETINET_IP_H_
36 #define _NETINET_IP_H_
37
38 /*
39 * Definitions for internet protocol version 4.
40 * Per RFC 791, September 1981.
41 */
42 #define IPVERSION 4
43
44 /*
45 * Structure of an internet header, naked of options.
46 */
47 struct ip {
48 #if _BYTE_ORDER == _LITTLE_ENDIAN
49 u_int ip_hl:4, /* header length */
50 ip_v:4; /* version */
51 #endif
52 #if _BYTE_ORDER == _BIG_ENDIAN
53 u_int ip_v:4, /* version */
54 ip_hl:4; /* header length */
55 #endif
56 u_int8_t ip_tos; /* type of service */
57 u_int16_t ip_len; /* total length */
58 u_int16_t ip_id; /* identification */
59 u_int16_t ip_off; /* fragment offset field */
60 #define IP_RF 0x8000 /* reserved fragment flag */
61 #define IP_DF 0x4000 /* dont fragment flag */
62 #define IP_MF 0x2000 /* more fragments flag */
63 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
64 u_int8_t ip_ttl; /* time to live */
65 u_int8_t ip_p; /* protocol */
66 u_int16_t ip_sum; /* checksum */
67 struct in_addr ip_src, ip_dst; /* source and dest address */
68 };
69
70 #define IP_MAXPACKET 65535 /* maximum packet size */
71
72 /*
73 * Definitions for IP type of service (ip_tos)
74 */
75 #define IPTOS_LOWDELAY 0x10
76 #define IPTOS_THROUGHPUT 0x08
77 #define IPTOS_RELIABILITY 0x04
78 /* IPTOS_LOWCOST 0x02 XXX */
79 #if 1
80 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
81 #define IPTOS_CE 0x01 /* congestion experienced */
82 #define IPTOS_ECT 0x02 /* ECN-capable transport */
83 #endif
84
85 /*
86 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
87 */
88 #define IPTOS_PREC_NETCONTROL 0xe0
89 #define IPTOS_PREC_INTERNETCONTROL 0xc0
90 #define IPTOS_PREC_CRITIC_ECP 0xa0
91 #define IPTOS_PREC_FLASHOVERRIDE 0x80
92 #define IPTOS_PREC_FLASH 0x60
93 #define IPTOS_PREC_IMMEDIATE 0x40
94 #define IPTOS_PREC_PRIORITY 0x20
95 #define IPTOS_PREC_ROUTINE 0x00
96
97 /*
98 * Definitions for DiffServ Codepoints as per RFCs 2474, 3246, 4594 & 8622.
99 * These are the 6 most significant bits as they appear on the wire, so the
100 * two least significant bits must be zero.
101 */
102 #define IPTOS_DSCP_CS0 0x00
103 #define IPTOS_DSCP_LE 0x04
104 #define IPTOS_DSCP_CS1 0x20
105 #define IPTOS_DSCP_AF11 0x28
106 #define IPTOS_DSCP_AF12 0x30
107 #define IPTOS_DSCP_AF13 0x38
108 #define IPTOS_DSCP_CS2 0x40
109 #define IPTOS_DSCP_AF21 0x48
110 #define IPTOS_DSCP_AF22 0x50
111 #define IPTOS_DSCP_AF23 0x58
112 #define IPTOS_DSCP_CS3 0x60
113 #define IPTOS_DSCP_AF31 0x68
114 #define IPTOS_DSCP_AF32 0x70
115 #define IPTOS_DSCP_AF33 0x78
116 #define IPTOS_DSCP_CS4 0x80
117 #define IPTOS_DSCP_AF41 0x88
118 #define IPTOS_DSCP_AF42 0x90
119 #define IPTOS_DSCP_AF43 0x98
120 #define IPTOS_DSCP_CS5 0xa0
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
127 * mapped to the 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_SATID 136 /* satnet id */
155 #define IPOPT_SSRR 137 /* strict source route */
156 #define IPOPT_RA 148 /* router alert */
157
158 /*
159 * Offsets to fields in options other than EOL and NOP.
160 */
161 #define IPOPT_OPTVAL 0 /* option ID */
162 #define IPOPT_OLEN 1 /* option length */
163 #define IPOPT_OFFSET 2 /* offset within option */
164 #define IPOPT_MINOFF 4 /* min value of above */
165
166 /*
167 * Time stamp option structure.
168 */
169 struct ip_timestamp {
170 u_int8_t ipt_code; /* IPOPT_TS */
171 u_int8_t ipt_len; /* size of structure (variable) */
172 u_int8_t ipt_ptr; /* index of current entry */
173 #if _BYTE_ORDER == _LITTLE_ENDIAN
174 u_int ipt_flg:4, /* flags, see below */
175 ipt_oflw:4; /* overflow counter */
176 #endif
177 #if _BYTE_ORDER == _BIG_ENDIAN
178 u_int ipt_oflw:4, /* overflow counter */
179 ipt_flg:4; /* flags, see below */
180 #endif
181 union ipt_timestamp {
182 u_int32_t ipt_time[1];
183 struct ipt_ta {
184 struct in_addr ipt_addr;
185 u_int32_t ipt_time;
186 } ipt_ta[1];
187 } ipt_timestamp;
188 };
189
190 /* flag bits for ipt_flg */
191 #define IPOPT_TS_TSONLY 0 /* timestamps only */
192 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
193 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
194
195 /* bits for security (not byte swapped) */
196 #define IPOPT_SECUR_UNCLASS 0x0000
197 #define IPOPT_SECUR_CONFID 0xf135
198 #define IPOPT_SECUR_EFTO 0x789a
199 #define IPOPT_SECUR_MMMM 0xbc4d
200 #define IPOPT_SECUR_RESTR 0xaf13
201 #define IPOPT_SECUR_SECRET 0xd788
202 #define IPOPT_SECUR_TOPSECRET 0x6bc5
203
204 /*
205 * Internet implementation parameters.
206 */
207 #define MAXTTL 255 /* maximum time to live (seconds) */
208 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
209 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
210 #define IPTTLDEC 1 /* subtracted when forwarding */
211
212 #define IP_MSS 576 /* default maximum segment size */
213
214 #ifdef _KERNEL
215
216 /* Maximum length for IP protocol queues */
217 #define IPQ_MAXLEN 2048
218
219 /*
220 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
221 * checksums. For the Internet checksum, struct ipovly can be used instead.
222 * For stronger checksums, the real thing must be used.
223 */
224 struct ippseudo {
225 struct in_addr ippseudo_src; /* source internet address */
226 struct in_addr ippseudo_dst; /* destination internet address */
227 u_int8_t ippseudo_pad; /* pad, must be zero */
228 u_int8_t ippseudo_p; /* protocol */
229 u_int16_t ippseudo_len; /* protocol length */
230 };
231 #endif /* _KERNEL */
232
233 #endif /* _NETINET_IP_H_ */
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