FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip.h
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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)ip.h 8.2 (Berkeley) 6/1/94
30 * $FreeBSD: releng/5.4/sys/netinet/ip.h 145335 2005-04-20 19:11:07Z cvs2svn $
31 */
32
33 #ifndef _NETINET_IP_H_
34 #define _NETINET_IP_H_
35
36 #include <sys/cdefs.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_char ip_tos; /* type of service */
57 u_short ip_len; /* total length */
58 u_short ip_id; /* identification */
59 u_short 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_char ip_ttl; /* time to live */
65 u_char ip_p; /* protocol */
66 u_short ip_sum; /* checksum */
67 struct in_addr ip_src,ip_dst; /* source and dest address */
68 } __packed;
69
70 #ifdef CTASSERT
71 CTASSERT(sizeof (struct ip) == 20);
72 #endif
73
74 #define IP_MAXPACKET 65535 /* maximum packet size */
75
76 /*
77 * Definitions for IP type of service (ip_tos)
78 */
79 #define IPTOS_LOWDELAY 0x10
80 #define IPTOS_THROUGHPUT 0x08
81 #define IPTOS_RELIABILITY 0x04
82 #define IPTOS_MINCOST 0x02
83 #if 1
84 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
85 #define IPTOS_CE 0x01
86 #define IPTOS_ECT 0x02
87 #endif
88
89 /*
90 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
91 */
92 #define IPTOS_PREC_NETCONTROL 0xe0
93 #define IPTOS_PREC_INTERNETCONTROL 0xc0
94 #define IPTOS_PREC_CRITIC_ECP 0xa0
95 #define IPTOS_PREC_FLASHOVERRIDE 0x80
96 #define IPTOS_PREC_FLASH 0x60
97 #define IPTOS_PREC_IMMEDIATE 0x40
98 #define IPTOS_PREC_PRIORITY 0x20
99 #define IPTOS_PREC_ROUTINE 0x00
100
101 /*
102 * ECN (Explicit Congestion Notification) codepoints in RFC3168
103 * mapped to the lower 2 bits of the TOS field.
104 */
105 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
106 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
107 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
108 #define IPTOS_ECN_CE 0x03 /* congestion experienced */
109 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */
110
111 /*
112 * Definitions for options.
113 */
114 #define IPOPT_COPIED(o) ((o)&0x80)
115 #define IPOPT_CLASS(o) ((o)&0x60)
116 #define IPOPT_NUMBER(o) ((o)&0x1f)
117
118 #define IPOPT_CONTROL 0x00
119 #define IPOPT_RESERVED1 0x20
120 #define IPOPT_DEBMEAS 0x40
121 #define IPOPT_RESERVED2 0x60
122
123 #define IPOPT_EOL 0 /* end of option list */
124 #define IPOPT_NOP 1 /* no operation */
125
126 #define IPOPT_RR 7 /* record packet route */
127 #define IPOPT_TS 68 /* timestamp */
128 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
129 #define IPOPT_LSRR 131 /* loose source route */
130 #define IPOPT_ESO 133 /* extended security */
131 #define IPOPT_CIPSO 134 /* commerical security */
132 #define IPOPT_SATID 136 /* satnet id */
133 #define IPOPT_SSRR 137 /* strict source route */
134 #define IPOPT_RA 148 /* router alert */
135
136 /*
137 * Offsets to fields in options other than EOL and NOP.
138 */
139 #define IPOPT_OPTVAL 0 /* option ID */
140 #define IPOPT_OLEN 1 /* option length */
141 #define IPOPT_OFFSET 2 /* offset within option */
142 #define IPOPT_MINOFF 4 /* min value of above */
143
144 /*
145 * Time stamp option structure.
146 */
147 struct ip_timestamp {
148 u_char ipt_code; /* IPOPT_TS */
149 u_char ipt_len; /* size of structure (variable) */
150 u_char ipt_ptr; /* index of current entry */
151 #if BYTE_ORDER == LITTLE_ENDIAN
152 u_int ipt_flg:4, /* flags, see below */
153 ipt_oflw:4; /* overflow counter */
154 #endif
155 #if BYTE_ORDER == BIG_ENDIAN
156 u_int ipt_oflw:4, /* overflow counter */
157 ipt_flg:4; /* flags, see below */
158 #endif
159 union ipt_timestamp {
160 n_long ipt_time[1];
161 struct ipt_ta {
162 struct in_addr ipt_addr;
163 n_long ipt_time;
164 } ipt_ta[1];
165 } ipt_timestamp;
166 };
167
168 /* flag bits for ipt_flg */
169 #define IPOPT_TS_TSONLY 0 /* timestamps only */
170 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
171 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
172
173 /* bits for security (not byte swapped) */
174 #define IPOPT_SECUR_UNCLASS 0x0000
175 #define IPOPT_SECUR_CONFID 0xf135
176 #define IPOPT_SECUR_EFTO 0x789a
177 #define IPOPT_SECUR_MMMM 0xbc4d
178 #define IPOPT_SECUR_RESTR 0xaf13
179 #define IPOPT_SECUR_SECRET 0xd788
180 #define IPOPT_SECUR_TOPSECRET 0x6bc5
181
182 /*
183 * Internet implementation parameters.
184 */
185 #define MAXTTL 255 /* maximum time to live (seconds) */
186 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
187 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
188 #define IPTTLDEC 1 /* subtracted when forwarding */
189
190 #define IP_MSS 576 /* default maximum segment size */
191
192 /*
193 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
194 * checksums. For the Internet checksum, struct ipovly can be used instead.
195 * For stronger checksums, the real thing must be used.
196 */
197 struct ippseudo {
198 struct in_addr ippseudo_src; /* source internet address */
199 struct in_addr ippseudo_dst; /* destination internet address */
200 u_char ippseudo_pad; /* pad, must be zero */
201 u_char ippseudo_p; /* protocol */
202 u_short ippseudo_len; /* protocol length */
203 };
204 #endif
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