FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip.h
1 /*-
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * @(#)ip.h 8.2 (Berkeley) 6/1/94
31 * $FreeBSD: src/sys/netinet/ip.h,v 1.33 2008/09/26 18:30:11 emaste Exp $
32 */
33
34 #ifndef _NETINET_IP_H_
35 #define _NETINET_IP_H_
36
37 #include <sys/cdefs.h>
38
39 /*
40 * Definitions for internet protocol version 4.
41 *
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 } __packed __aligned(4);
71
72 #define IP_MAXPACKET 65535 /* maximum packet size */
73
74 /*
75 * Definitions for IP type of service (ip_tos).
76 */
77 #define IPTOS_LOWDELAY 0x10
78 #define IPTOS_THROUGHPUT 0x08
79 #define IPTOS_RELIABILITY 0x04
80 #define IPTOS_MINCOST 0x02
81
82 /*
83 * Definitions for IP precedence (also in ip_tos) (hopefully unused).
84 */
85 #define IPTOS_PREC_NETCONTROL 0xe0
86 #define IPTOS_PREC_INTERNETCONTROL 0xc0
87 #define IPTOS_PREC_CRITIC_ECP 0xa0
88 #define IPTOS_PREC_FLASHOVERRIDE 0x80
89 #define IPTOS_PREC_FLASH 0x60
90 #define IPTOS_PREC_IMMEDIATE 0x40
91 #define IPTOS_PREC_PRIORITY 0x20
92 #define IPTOS_PREC_ROUTINE 0x00
93
94 /*
95 * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the
96 * lower 2 bits of the TOS field.
97 */
98 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
99 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
100 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
101 #define IPTOS_ECN_CE 0x03 /* congestion experienced */
102 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */
103
104 /*
105 * Definitions for options.
106 */
107 #define IPOPT_COPIED(o) ((o)&0x80)
108 #define IPOPT_CLASS(o) ((o)&0x60)
109 #define IPOPT_NUMBER(o) ((o)&0x1f)
110
111 #define IPOPT_CONTROL 0x00
112 #define IPOPT_RESERVED1 0x20
113 #define IPOPT_DEBMEAS 0x40
114 #define IPOPT_RESERVED2 0x60
115
116 #define IPOPT_EOL 0 /* end of option list */
117 #define IPOPT_NOP 1 /* no operation */
118
119 #define IPOPT_RR 7 /* record packet route */
120 #define IPOPT_TS 68 /* timestamp */
121 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
122 #define IPOPT_LSRR 131 /* loose source route */
123 #define IPOPT_ESO 133 /* extended security */
124 #define IPOPT_CIPSO 134 /* commerical security */
125 #define IPOPT_SATID 136 /* satnet id */
126 #define IPOPT_SSRR 137 /* strict source route */
127 #define IPOPT_RA 148 /* router alert */
128
129 /*
130 * Offsets to fields in options other than EOL and NOP.
131 */
132 #define IPOPT_OPTVAL 0 /* option ID */
133 #define IPOPT_OLEN 1 /* option length */
134 #define IPOPT_OFFSET 2 /* offset within option */
135 #define IPOPT_MINOFF 4 /* min value of above */
136
137 /*
138 * Time stamp option structure.
139 */
140 struct ip_timestamp {
141 u_char ipt_code; /* IPOPT_TS */
142 u_char ipt_len; /* size of structure (variable) */
143 u_char ipt_ptr; /* index of current entry */
144 #if BYTE_ORDER == LITTLE_ENDIAN
145 u_int ipt_flg:4, /* flags, see below */
146 ipt_oflw:4; /* overflow counter */
147 #endif
148 #if BYTE_ORDER == BIG_ENDIAN
149 u_int ipt_oflw:4, /* overflow counter */
150 ipt_flg:4; /* flags, see below */
151 #endif
152 union ipt_timestamp {
153 n_long ipt_time[1];
154 struct ipt_ta {
155 struct in_addr ipt_addr;
156 n_long ipt_time;
157 } ipt_ta[1];
158 } ipt_timestamp;
159 };
160
161 /* Flag bits for ipt_flg. */
162 #define IPOPT_TS_TSONLY 0 /* timestamps only */
163 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
164 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
165
166 /* Bits for security (not byte swapped). */
167 #define IPOPT_SECUR_UNCLASS 0x0000
168 #define IPOPT_SECUR_CONFID 0xf135
169 #define IPOPT_SECUR_EFTO 0x789a
170 #define IPOPT_SECUR_MMMM 0xbc4d
171 #define IPOPT_SECUR_RESTR 0xaf13
172 #define IPOPT_SECUR_SECRET 0xd788
173 #define IPOPT_SECUR_TOPSECRET 0x6bc5
174
175 /*
176 * Internet implementation parameters.
177 */
178 #define MAXTTL 255 /* maximum time to live (seconds) */
179 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
180 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
181 #define IPTTLDEC 1 /* subtracted when forwarding */
182 #define IP_MSS 576 /* default maximum segment size */
183
184 /*
185 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
186 * checksums. For the Internet checksum, struct ipovly can be used instead.
187 * For stronger checksums, the real thing must be used.
188 */
189 struct ippseudo {
190 struct in_addr ippseudo_src; /* source internet address */
191 struct in_addr ippseudo_dst; /* destination internet address */
192 u_char ippseudo_pad; /* pad, must be zero */
193 u_char ippseudo_p; /* protocol */
194 u_short ippseudo_len; /* protocol length */
195 };
196 #endif
197
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