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1 /* @(#) $Header: /home/cvs/wifitools/wifipcap/ip.h,v 1.1.1.1 2006/12/14 01:22:11 jpang Exp $ (LBL) */
2 /*
3 * Copyright (c) 1982, 1986, 1993
4 * The Regents of the University of California. 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 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)ip.h 8.2 (Berkeley) 6/1/94
35 */
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 * We declare ip_len and ip_off to be short, rather than u_short
47 * pragmatically since otherwise unsigned comparisons can result
48 * against negative integers quite easily, and fail in subtle ways.
49 */
50 struct ip {
51 u_int8_t ip_vhl; /* header length, version */
52 #define IP_V(ip) (((ip)->ip_vhl & 0xf0) >> 4)
53 #define IP_HL(ip) ((ip)->ip_vhl & 0x0f)
54 u_int8_t ip_tos; /* type of service */
55 u_int16_t ip_len; /* total length */
56 u_int16_t ip_id; /* identification */
57 u_int16_t ip_off; /* fragment offset field */
58 #define IP_DF 0x4000 /* dont fragment flag */
59 #define IP_MF 0x2000 /* more fragments flag */
60 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
61 u_int8_t ip_ttl; /* time to live */
62 u_int8_t ip_p; /* protocol */
63 u_int16_t ip_sum; /* checksum */
64 struct in_addr ip_src,ip_dst; /* source and dest address */
65 };
66
67 #define IP_MAXPACKET 65535 /* maximum packet size */
68
69 /*
70 * Definitions for IP type of service (ip_tos)
71 */
72 #define IPTOS_LOWDELAY 0x10
73 #define IPTOS_THROUGHPUT 0x08
74 #define IPTOS_RELIABILITY 0x04
75
76 /*
77 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
78 */
79 #define IPTOS_PREC_NETCONTROL 0xe0
80 #define IPTOS_PREC_INTERNETCONTROL 0xc0
81 #define IPTOS_PREC_CRITIC_ECP 0xa0
82 #define IPTOS_PREC_FLASHOVERRIDE 0x80
83 #define IPTOS_PREC_FLASH 0x60
84 #define IPTOS_PREC_IMMEDIATE 0x40
85 #define IPTOS_PREC_PRIORITY 0x20
86 #define IPTOS_PREC_ROUTINE 0x00
87
88 /*
89 * Definitions for options.
90 */
91 #define IPOPT_COPIED(o) ((o)&0x80)
92 #define IPOPT_CLASS(o) ((o)&0x60)
93 #define IPOPT_NUMBER(o) ((o)&0x1f)
94
95 #define IPOPT_CONTROL 0x00
96 #define IPOPT_RESERVED1 0x20
97 #define IPOPT_DEBMEAS 0x40
98 #define IPOPT_RESERVED2 0x60
99
100 #define IPOPT_EOL 0 /* end of option list */
101 #define IPOPT_NOP 1 /* no operation */
102
103 #define IPOPT_RR 7 /* record packet route */
104 #define IPOPT_TS 68 /* timestamp */
105 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
106 #define IPOPT_LSRR 131 /* loose source route */
107 #define IPOPT_SATID 136 /* satnet id */
108 #define IPOPT_SSRR 137 /* strict source route */
109 #define IPOPT_RA 148 /* router-alert, rfc2113 */
110
111 /*
112 * Offsets to fields in options other than EOL and NOP.
113 */
114 #define IPOPT_OPTVAL 0 /* option ID */
115 #define IPOPT_OLEN 1 /* option length */
116 #define IPOPT_OFFSET 2 /* offset within option */
117 #define IPOPT_MINOFF 4 /* min value of above */
118
119 /*
120 * Time stamp option structure.
121 */
122 struct ip_timestamp {
123 u_int8_t ipt_code; /* IPOPT_TS */
124 u_int8_t ipt_len; /* size of structure (variable) */
125 u_int8_t ipt_ptr; /* index of current entry */
126 u_int8_t ipt_oflwflg; /* flags, overflow counter */
127 #define IPTS_OFLW(ip) (((ipt)->ipt_oflwflg & 0xf0) >> 4)
128 #define IPTS_FLG(ip) ((ipt)->ipt_oflwflg & 0x0f)
129 union ipt_timestamp {
130 u_int32_t ipt_time[1];
131 struct ipt_ta {
132 struct in_addr ipt_addr;
133 u_int32_t ipt_time;
134 } ipt_ta[1];
135 } ipt_timestamp;
136 };
137
138 /* flag bits for ipt_flg */
139 #define IPOPT_TS_TSONLY 0 /* timestamps only */
140 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
141 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
142
143 /* bits for security (not byte swapped) */
144 #define IPOPT_SECUR_UNCLASS 0x0000
145 #define IPOPT_SECUR_CONFID 0xf135
146 #define IPOPT_SECUR_EFTO 0x789a
147 #define IPOPT_SECUR_MMMM 0xbc4d
148 #define IPOPT_SECUR_RESTR 0xaf13
149 #define IPOPT_SECUR_SECRET 0xd788
150 #define IPOPT_SECUR_TOPSECRET 0x6bc5
151
152 /*
153 * Internet implementation parameters.
154 */
155 #define MAXTTL 255 /* maximum time to live (seconds) */
156 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
157 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
158 #define IPTTLDEC 1 /* subtracted when forwarding */
159
160 #define IP_MSS 576 /* default maximum segment size */
161
162 /* in print-ip.c */
163 extern u_int32_t ip_finddst(const struct ip *);
164
165 ///////////////////////////////////////////////////////////////////////////////
166
167 /* Jeff: will pass this endian-fixed, fully decoded version to applications */
168 struct ip4_hdr_t {
169 u_int8_t ver; /* ip version */
170 u_int16_t hlen; /* header length (in bytes) */
171 u_int8_t tos; /* type of service */
172 u_int16_t len; /* total length (in bytes) */
173 u_int16_t id; /* identification */
174 bool df; /* don't fragment flag */
175 bool mf; /* more fragments flag */
176 u_int16_t fragoff; /* fragment offset */
177 u_int8_t ttl; /* time to live */
178 u_int8_t proto; /* protocol */
179 u_int16_t cksum; /* header checksum */
180 struct in_addr src, dst; /* source and dest address */
181 };