FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip.h
1 /* $NetBSD: ip.h,v 1.26 2004/04/25 22:25:03 jonathan Exp $ */
2
3 /*
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)ip.h 8.2 (Berkeley) 6/1/94
32 */
33
34 #ifndef _NETINET_IP_H_
35 #define _NETINET_IP_H_
36
37 /*
38 * Definitions for internet protocol version 4.
39 * Per RFC 791, September 1981.
40 */
41 #define IPVERSION 4
42
43 /*
44 * Structure of an internet header, naked of options.
45 */
46 struct ip {
47 #if BYTE_ORDER == LITTLE_ENDIAN
48 u_int8_t ip_hl:4, /* header length */
49 ip_v:4; /* version */
50 #endif
51 #if BYTE_ORDER == BIG_ENDIAN
52 u_int8_t ip_v:4, /* version */
53 ip_hl:4; /* header length */
54 #endif
55 u_int8_t ip_tos; /* type of service */
56 u_int16_t ip_len; /* total length */
57 u_int16_t ip_id; /* identification */
58 u_int16_t ip_off; /* fragment offset field */
59 #define IP_RF 0x8000 /* reserved fragment flag */
60 #define IP_EF 0x8000 /* evil flag, per RFC 3514 */
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_int8_t ip_ttl; /* time to live */
65 u_int8_t ip_p; /* protocol */
66 u_int16_t ip_sum; /* checksum */
67 struct in_addr ip_src, ip_dst; /* source and dest address */
68 } __attribute__((__packed__));
69
70 #define IP_MAXPACKET 65535 /* maximum packet size */
71
72 /*
73 * Definitions for IP type of service (ip_tos)
74 */
75 #define IPTOS_LOWDELAY 0x10
76 #define IPTOS_THROUGHPUT 0x08
77 #define IPTOS_RELIABILITY 0x04
78 /* IPTOS_LOWCOST 0x02 XXX */
79 #if 1
80 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
81 #define IPTOS_CE 0x01 /* congestion experienced */
82 #define IPTOS_ECT 0x02 /* ECN-capable transport */
83 #endif
84
85 /*
86 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
87 */
88 #define IPTOS_PREC_NETCONTROL 0xe0
89 #define IPTOS_PREC_INTERNETCONTROL 0xc0
90 #define IPTOS_PREC_CRITIC_ECP 0xa0
91 #define IPTOS_PREC_FLASHOVERRIDE 0x80
92 #define IPTOS_PREC_FLASH 0x60
93 #define IPTOS_PREC_IMMEDIATE 0x40
94 #define IPTOS_PREC_PRIORITY 0x20
95 #define IPTOS_PREC_ROUTINE 0x00
96
97 /*
98 * ECN (Explicit Congestion Notification) codepoints in RFC3168
99 * mapped to the lower 2 bits of the TOS field.
100 */
101 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
102 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
103 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
104 #define IPTOS_ECN_CE 0x03 /* congestion experienced */
105 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */
106
107 /*
108 * Definitions for options.
109 */
110 #define IPOPT_COPIED(o) ((o)&0x80)
111 #define IPOPT_CLASS(o) ((o)&0x60)
112 #define IPOPT_NUMBER(o) ((o)&0x1f)
113
114 #define IPOPT_CONTROL 0x00
115 #define IPOPT_RESERVED1 0x20
116 #define IPOPT_DEBMEAS 0x40
117 #define IPOPT_RESERVED2 0x60
118
119 #define IPOPT_EOL 0 /* end of option list */
120 #define IPOPT_NOP 1 /* no operation */
121
122 #define IPOPT_RR 7 /* record packet route */
123 #define IPOPT_TS 68 /* timestamp */
124 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
125 #define IPOPT_LSRR 131 /* loose source route */
126 #define IPOPT_SATID 136 /* satnet id */
127 #define IPOPT_SSRR 137 /* strict source route */
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_int8_t ipt_code; /* IPOPT_TS */
142 u_int8_t ipt_len; /* size of structure (variable) */
143 u_int8_t ipt_ptr; /* index of current entry */
144 #if BYTE_ORDER == LITTLE_ENDIAN
145 u_int8_t ipt_flg:4, /* flags, see below */
146 ipt_oflw:4; /* overflow counter */
147 #endif
148 #if BYTE_ORDER == BIG_ENDIAN
149 u_int8_t ipt_oflw:4, /* overflow counter */
150 ipt_flg:4; /* flags, see below */
151 #endif
152 union ipt_timestamp {
153 n_time ipt_time[1];
154 struct ipt_ta {
155 struct in_addr ipt_addr;
156 n_time ipt_time;
157 } ipt_ta[1] __attribute__((__packed__));
158 } ipt_timestamp __attribute__((__packed__));
159 } __attribute__((__packed__));
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
183 #define IP_MSS 576 /* default maximum segment size */
184
185 /*
186 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
187 * checksums. For the Internet checksum, struct ipovly can be used instead.
188 * For stronger checksums, the real thing must be used.
189 */
190 struct ippseudo {
191 struct in_addr ippseudo_src; /* source internet address */
192 struct in_addr ippseudo_dst; /* destination internet address */
193 u_int8_t ippseudo_pad; /* pad, must be zero */
194 u_int8_t ippseudo_p; /* protocol */
195 u_int16_t ippseudo_len; /* protocol length */
196 } __packed;
197 #endif /* _NETINET_IP_H_ */
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