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: src/sys/netinet/ip.h,v 1.10.2.2 1999/09/05 08:18:24 peter Exp $
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 * We declare ip_len and ip_off to be short, rather than u_short
50 * pragmatically since otherwise unsigned comparisons can result
51 * against negative integers quite easily, and fail in subtle ways.
52 */
53 struct ip {
54 #ifdef _IP_VHL
55 u_char ip_vhl; /* version << 4 | header length >> 2 */
56 #else
57 #if BYTE_ORDER == LITTLE_ENDIAN
58 u_char ip_hl:4, /* header length */
59 ip_v:4; /* version */
60 #endif
61 #if BYTE_ORDER == BIG_ENDIAN
62 u_char ip_v:4, /* version */
63 ip_hl:4; /* header length */
64 #endif
65 #endif /* not _IP_VHL */
66 u_char ip_tos; /* type of service */
67 u_short ip_len; /* total length */
68 u_short ip_id; /* identification */
69 u_short ip_off; /* fragment offset field */
70 #define IP_RF 0x8000 /* reserved fragment flag */
71 #define IP_DF 0x4000 /* dont fragment flag */
72 #define IP_MF 0x2000 /* more fragments flag */
73 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
74 u_char ip_ttl; /* time to live */
75 u_char ip_p; /* protocol */
76 u_short ip_sum; /* checksum */
77 struct in_addr ip_src,ip_dst; /* source and dest address */
78 };
79
80 #ifdef _IP_VHL
81 #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl))
82 #define IP_VHL_HL(vhl) ((vhl) & 0x0f)
83 #define IP_VHL_V(vhl) ((vhl) >> 4)
84 #define IP_VHL_BORING 0x45
85 #endif
86
87 #define IP_MAXPACKET 65535 /* maximum packet size */
88
89 /*
90 * Definitions for IP type of service (ip_tos)
91 */
92 #define IPTOS_LOWDELAY 0x10
93 #define IPTOS_THROUGHPUT 0x08
94 #define IPTOS_RELIABILITY 0x04
95 #define IPTOS_MINCOST 0x02
96
97 /*
98 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
99 */
100 #define IPTOS_PREC_NETCONTROL 0xe0
101 #define IPTOS_PREC_INTERNETCONTROL 0xc0
102 #define IPTOS_PREC_CRITIC_ECP 0xa0
103 #define IPTOS_PREC_FLASHOVERRIDE 0x80
104 #define IPTOS_PREC_FLASH 0x60
105 #define IPTOS_PREC_IMMEDIATE 0x40
106 #define IPTOS_PREC_PRIORITY 0x20
107 #define IPTOS_PREC_ROUTINE 0x00
108
109 /*
110 * Definitions for options.
111 */
112 #define IPOPT_COPIED(o) ((o)&0x80)
113 #define IPOPT_CLASS(o) ((o)&0x60)
114 #define IPOPT_NUMBER(o) ((o)&0x1f)
115
116 #define IPOPT_CONTROL 0x00
117 #define IPOPT_RESERVED1 0x20
118 #define IPOPT_DEBMEAS 0x40
119 #define IPOPT_RESERVED2 0x60
120
121 #define IPOPT_EOL 0 /* end of option list */
122 #define IPOPT_NOP 1 /* no operation */
123
124 #define IPOPT_RR 7 /* record packet route */
125 #define IPOPT_TS 68 /* timestamp */
126 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
127 #define IPOPT_LSRR 131 /* loose source route */
128 #define IPOPT_SATID 136 /* satnet id */
129 #define IPOPT_SSRR 137 /* strict source route */
130 #define IPOPT_RA 148 /* router alert */
131
132 /*
133 * Offsets to fields in options other than EOL and NOP.
134 */
135 #define IPOPT_OPTVAL 0 /* option ID */
136 #define IPOPT_OLEN 1 /* option length */
137 #define IPOPT_OFFSET 2 /* offset within option */
138 #define IPOPT_MINOFF 4 /* min value of above */
139
140 /*
141 * Time stamp option structure.
142 */
143 struct ip_timestamp {
144 u_char ipt_code; /* IPOPT_TS */
145 u_char ipt_len; /* size of structure (variable) */
146 u_char ipt_ptr; /* index of current entry */
147 #if BYTE_ORDER == LITTLE_ENDIAN
148 u_char ipt_flg:4, /* flags, see below */
149 ipt_oflw:4; /* overflow counter */
150 #endif
151 #if BYTE_ORDER == BIG_ENDIAN
152 u_char ipt_oflw:4, /* overflow counter */
153 ipt_flg:4; /* flags, see below */
154 #endif
155 union ipt_timestamp {
156 n_long ipt_time[1];
157 struct ipt_ta {
158 struct in_addr ipt_addr;
159 n_long ipt_time;
160 } ipt_ta[1];
161 } ipt_timestamp;
162 };
163
164 /* flag bits for ipt_flg */
165 #define IPOPT_TS_TSONLY 0 /* timestamps only */
166 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
167 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
168
169 /* bits for security (not byte swapped) */
170 #define IPOPT_SECUR_UNCLASS 0x0000
171 #define IPOPT_SECUR_CONFID 0xf135
172 #define IPOPT_SECUR_EFTO 0x789a
173 #define IPOPT_SECUR_MMMM 0xbc4d
174 #define IPOPT_SECUR_RESTR 0xaf13
175 #define IPOPT_SECUR_SECRET 0xd788
176 #define IPOPT_SECUR_TOPSECRET 0x6bc5
177
178 /*
179 * Internet implementation parameters.
180 */
181 #define MAXTTL 255 /* maximum time to live (seconds) */
182 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
183 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
184 #define IPTTLDEC 1 /* subtracted when forwarding */
185
186 #define IP_MSS 576 /* default maximum segment size */
187
188 #endif
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