1 /* $OpenBSD: ip.h,v 1.12 2006/04/27 02:19:32 tedu Exp $ */
2 /* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */
5 * Copyright (c) 1982, 1986, 1993
6 * The Regents of the University of California. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
32 * @(#)ip.h 8.1 (Berkeley) 6/10/93
35 #ifndef _NETINET_IP_H_
36 #define _NETINET_IP_H_
38 #include <sys/cdefs.h>
39 #include <sys/types.h>
41 #include <netinet/in.h>
42 #include <netinet/in_systm.h>
47 * Definitions for internet protocol version 4.
48 * Per RFC 791, September 1981.
53 * Structure of an internet header, naked of options.
56 #if BYTE_ORDER == LITTLE_ENDIAN
57 u_int32_t ip_hl:4, /* header length */
60 #if BYTE_ORDER == BIG_ENDIAN
61 u_int32_t ip_v:4, /* version */
62 ip_hl:4; /* header length */
64 u_int8_t ip_tos; /* type of service */
65 u_int16_t ip_len; /* total length */
66 u_int16_t ip_id; /* identification */
67 u_int16_t ip_off; /* fragment offset field */
68 #define IP_RF 0x8000 /* reserved fragment flag */
69 #define IP_DF 0x4000 /* dont fragment flag */
70 #define IP_MF 0x2000 /* more fragments flag */
71 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
72 u_int8_t ip_ttl; /* time to live */
73 u_int8_t ip_p; /* protocol */
74 u_int16_t ip_sum; /* checksum */
75 struct in_addr ip_src, ip_dst; /* source and dest address */
78 #define IP_MAXPACKET 65535 /* maximum packet size */
81 * Definitions for IP type of service (ip_tos)
83 #define IPTOS_LOWDELAY 0x10
84 #define IPTOS_THROUGHPUT 0x08
85 #define IPTOS_RELIABILITY 0x04
86 /* IPTOS_LOWCOST 0x02 XXX */
88 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
89 #define IPTOS_CE 0x01 /* congestion experienced */
90 #define IPTOS_ECT 0x02 /* ECN-capable transport */
94 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
96 #define IPTOS_PREC_NETCONTROL 0xe0
97 #define IPTOS_PREC_INTERNETCONTROL 0xc0
98 #define IPTOS_PREC_CRITIC_ECP 0xa0
99 #define IPTOS_PREC_FLASHOVERRIDE 0x80
100 #define IPTOS_PREC_FLASH 0x60
101 #define IPTOS_PREC_IMMEDIATE 0x40
102 #define IPTOS_PREC_PRIORITY 0x20
103 #define IPTOS_PREC_ROUTINE 0x00
106 * ECN (Explicit Congestion Notification) codepoints in RFC3168
107 * mapped to the lower 2 bits of the TOS field.
109 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
110 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
111 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
112 #define IPTOS_ECN_CE 0x03 /* congestion experienced */
113 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */
116 * Definitions for options.
118 #define IPOPT_COPIED(o) ((o)&0x80)
119 #define IPOPT_CLASS(o) ((o)&0x60)
120 #define IPOPT_NUMBER(o) ((o)&0x1f)
122 #define IPOPT_CONTROL 0x00
123 #define IPOPT_RESERVED1 0x20
124 #define IPOPT_DEBMEAS 0x40
125 #define IPOPT_RESERVED2 0x60
127 #define IPOPT_EOL 0 /* end of option list */
128 #define IPOPT_NOP 1 /* no operation */
130 #define IPOPT_RR 7 /* record packet route */
131 #define IPOPT_TS 68 /* timestamp */
132 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
133 #define IPOPT_LSRR 131 /* loose source route */
134 #define IPOPT_SATID 136 /* satnet id */
135 #define IPOPT_SSRR 137 /* strict source route */
138 * Offsets to fields in options other than EOL and NOP.
140 #define IPOPT_OPTVAL 0 /* option ID */
141 #define IPOPT_OLEN 1 /* option length */
142 #define IPOPT_OFFSET 2 /* offset within option */
143 #define IPOPT_MINOFF 4 /* min value of above */
146 * Time stamp option structure.
148 struct ip_timestamp {
149 u_int8_t ipt_code; /* IPOPT_TS */
150 u_int8_t ipt_len; /* size of structure (variable) */
151 u_int8_t ipt_ptr; /* index of current entry */
152 #if _BYTE_ORDER == _LITTLE_ENDIAN
153 u_int32_t ipt_flg:4, /* flags, see below */
154 ipt_oflw:4; /* overflow counter */
156 #if _BYTE_ORDER == _BIG_ENDIAN
157 u_int32_t ipt_oflw:4, /* overflow counter */
158 ipt_flg:4; /* flags, see below */
160 union ipt_timestamp {
163 struct in_addr ipt_addr;
169 /* flag bits for ipt_flg */
170 #define IPOPT_TS_TSONLY 0 /* timestamps only */
171 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
172 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
174 /* bits for security (not byte swapped) */
175 #define IPOPT_SECUR_UNCLASS 0x0000
176 #define IPOPT_SECUR_CONFID 0xf135
177 #define IPOPT_SECUR_EFTO 0x789a
178 #define IPOPT_SECUR_MMMM 0xbc4d
179 #define IPOPT_SECUR_RESTR 0xaf13
180 #define IPOPT_SECUR_SECRET 0xd788
181 #define IPOPT_SECUR_TOPSECRET 0x6bc5
184 * Internet implementation parameters.
186 #define MAXTTL 255 /* maximum time to live (seconds) */
187 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
188 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
189 #define IPTTLDEC 1 /* subtracted when forwarding */
191 #define IP_MSS 576 /* default maximum segment size */
194 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
195 * checksums. For the Internet checksum, struct ipovly can be used instead.
196 * For stronger checksums, the real thing must be used.
199 struct in_addr ippseudo_src; /* source internet address */
200 struct in_addr ippseudo_dst; /* destination internet address */
201 u_int8_t ippseudo_pad; /* pad, must be zero */
202 u_int8_t ippseudo_p; /* protocol */
203 u_int16_t ippseudo_len; /* protocol length */
206 /* BIONIC addition: declarations matching the Linux kernel */
207 /* some programs expect these... */
209 #define IPOPT_OPTVAL 0
211 #define IPOPT_OFFSET 2
212 #define IPOPT_MINOFF 4
213 #define MAX_IPOPTLEN 40
215 #define IPOPT_COPY 0x80
216 #define IPOPT_CLASS_MASK 0x60
217 #define IPOPT_NUMBER_MASK 0x1f
219 #define IPOPT_CONTROL 0x00
220 #define IPOPT_RESERVED1 0x20
221 #define IPOPT_MEASUREMENT 0x40
222 #define IPOPT_RESERVED2 0x60
224 #define IPOPT_END (0 |IPOPT_CONTROL)
225 #define IPOPT_NOOP (1 |IPOPT_CONTROL)
226 #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
227 #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
228 #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
229 #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
232 #if defined(__LITTLE_ENDIAN_BITFIELD)
235 #elif defined (__BIG_ENDIAN_BITFIELD)
239 #error "Please fix <asm/byteorder.h>"
258 uint8_t auth_data[0];
275 #endif /* _NETINET_IP_H_ */