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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)ip.h 8.2 (Berkeley) 6/1/94
34 * $FreeBSD: releng/5.0/sys/netinet/ip.h 105586 2002-10-20 22:52:07Z phk $
35 */
36
37 #ifndef _NETINET_IP_H_
38 #define _NETINET_IP_H_
39
40 /*
41 * Definitions for internet protocol version 4.
42 * Per RFC 791, September 1981.
43 */
44 #define IPVERSION 4
45
46 /*
47 * Structure of an internet header, naked of options.
48 */
49 struct ip {
50 #if BYTE_ORDER == LITTLE_ENDIAN
51 u_int ip_hl:4, /* header length */
52 ip_v:4; /* version */
53 #endif
54 #if BYTE_ORDER == BIG_ENDIAN
55 u_int 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 } __attribute__((__packed__));
71
72 #ifdef CTASSERT
73 CTASSERT(sizeof (struct ip) == 20);
74 #endif
75
76 #define IP_MAXPACKET 65535 /* maximum packet size */
77
78 /*
79 * Definitions for IP type of service (ip_tos)
80 */
81 #define IPTOS_LOWDELAY 0x10
82 #define IPTOS_THROUGHPUT 0x08
83 #define IPTOS_RELIABILITY 0x04
84 #define IPTOS_MINCOST 0x02
85 /* ECN bits proposed by Sally Floyd */
86 #define IPTOS_CE 0x01 /* congestion experienced */
87 #define IPTOS_ECT 0x02 /* ECN-capable transport */
88
89
90 /*
91 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
92 */
93 #define IPTOS_PREC_NETCONTROL 0xe0
94 #define IPTOS_PREC_INTERNETCONTROL 0xc0
95 #define IPTOS_PREC_CRITIC_ECP 0xa0
96 #define IPTOS_PREC_FLASHOVERRIDE 0x80
97 #define IPTOS_PREC_FLASH 0x60
98 #define IPTOS_PREC_IMMEDIATE 0x40
99 #define IPTOS_PREC_PRIORITY 0x20
100 #define IPTOS_PREC_ROUTINE 0x00
101
102 /*
103 * Definitions for options.
104 */
105 #define IPOPT_COPIED(o) ((o)&0x80)
106 #define IPOPT_CLASS(o) ((o)&0x60)
107 #define IPOPT_NUMBER(o) ((o)&0x1f)
108
109 #define IPOPT_CONTROL 0x00
110 #define IPOPT_RESERVED1 0x20
111 #define IPOPT_DEBMEAS 0x40
112 #define IPOPT_RESERVED2 0x60
113
114 #define IPOPT_EOL 0 /* end of option list */
115 #define IPOPT_NOP 1 /* no operation */
116
117 #define IPOPT_RR 7 /* record packet route */
118 #define IPOPT_TS 68 /* timestamp */
119 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
120 #define IPOPT_LSRR 131 /* loose source route */
121 #define IPOPT_ESO 133 /* extended security */
122 #define IPOPT_CIPSO 134 /* commerical security */
123 #define IPOPT_SATID 136 /* satnet id */
124 #define IPOPT_SSRR 137 /* strict source route */
125 #define IPOPT_RA 148 /* router alert */
126
127 /*
128 * Offsets to fields in options other than EOL and NOP.
129 */
130 #define IPOPT_OPTVAL 0 /* option ID */
131 #define IPOPT_OLEN 1 /* option length */
132 #define IPOPT_OFFSET 2 /* offset within option */
133 #define IPOPT_MINOFF 4 /* min value of above */
134
135 /*
136 * Time stamp option structure.
137 */
138 struct ip_timestamp {
139 u_char ipt_code; /* IPOPT_TS */
140 u_char ipt_len; /* size of structure (variable) */
141 u_char ipt_ptr; /* index of current entry */
142 #if BYTE_ORDER == LITTLE_ENDIAN
143 u_int ipt_flg:4, /* flags, see below */
144 ipt_oflw:4; /* overflow counter */
145 #endif
146 #if BYTE_ORDER == BIG_ENDIAN
147 u_int ipt_oflw:4, /* overflow counter */
148 ipt_flg:4; /* flags, see below */
149 #endif
150 union ipt_timestamp {
151 n_long ipt_time[1];
152 struct ipt_ta {
153 struct in_addr ipt_addr;
154 n_long ipt_time;
155 } ipt_ta[1];
156 } ipt_timestamp;
157 };
158
159 /* flag bits for ipt_flg */
160 #define IPOPT_TS_TSONLY 0 /* timestamps only */
161 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
162 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
163
164 /* bits for security (not byte swapped) */
165 #define IPOPT_SECUR_UNCLASS 0x0000
166 #define IPOPT_SECUR_CONFID 0xf135
167 #define IPOPT_SECUR_EFTO 0x789a
168 #define IPOPT_SECUR_MMMM 0xbc4d
169 #define IPOPT_SECUR_RESTR 0xaf13
170 #define IPOPT_SECUR_SECRET 0xd788
171 #define IPOPT_SECUR_TOPSECRET 0x6bc5
172
173 /*
174 * Internet implementation parameters.
175 */
176 #define MAXTTL 255 /* maximum time to live (seconds) */
177 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
178 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
179 #define IPTTLDEC 1 /* subtracted when forwarding */
180
181 #define IP_MSS 576 /* default maximum segment size */
182
183 #endif
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