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1 office 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 */
35  
36 #ifndef TCPDUMP_IP_H
37 #define TCPDUMP_IP_H
38  
39 #include "tcpdump-stdinc.h"
40  
41 /*
42 * Definitions for internet protocol version 4.
43 * Per RFC 791, September 1981.
44 */
45 #define IPVERSION 4
46  
47 /*
48 * Structure of an internet header, naked of options.
49 *
50 * We declare ip_len and ip_off to be short, rather than u_short
51 * pragmatically since otherwise unsigned comparisons can result
52 * against negative integers quite easily, and fail in subtle ways.
53 */
54 struct ip {
55 uint8_t ip_vhl; /* header length, version */
56 #define IP_V(ip) (((ip)->ip_vhl & 0xf0) >> 4)
57 #define IP_HL(ip) ((ip)->ip_vhl & 0x0f)
58 uint8_t ip_tos; /* type of service */
59 uint16_t ip_len; /* total length */
60 uint16_t ip_id; /* identification */
61 uint16_t ip_off; /* fragment offset field */
62 #define IP_DF 0x4000 /* dont fragment flag */
63 #define IP_MF 0x2000 /* more fragments flag */
64 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
65 uint8_t ip_ttl; /* time to live */
66 uint8_t ip_p; /* protocol */
67 uint16_t ip_sum; /* checksum */
68 struct in_addr ip_src,ip_dst; /* source and dest address */
69 } UNALIGNED;
70  
71 #define IP_MAXPACKET 65535 /* maximum packet size */
72  
73 /*
74 * Definitions for IP type of service (ip_tos)
75 */
76 #define IPTOS_LOWDELAY 0x10
77 #define IPTOS_THROUGHPUT 0x08
78 #define IPTOS_RELIABILITY 0x04
79  
80 /*
81 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
82 */
83 #define IPTOS_PREC_NETCONTROL 0xe0
84 #define IPTOS_PREC_INTERNETCONTROL 0xc0
85 #define IPTOS_PREC_CRITIC_ECP 0xa0
86 #define IPTOS_PREC_FLASHOVERRIDE 0x80
87 #define IPTOS_PREC_FLASH 0x60
88 #define IPTOS_PREC_IMMEDIATE 0x40
89 #define IPTOS_PREC_PRIORITY 0x20
90 #define IPTOS_PREC_ROUTINE 0x00
91  
92 /*
93 * Definitions for options.
94 */
95 #define IPOPT_COPIED(o) ((o)&0x80)
96 #define IPOPT_CLASS(o) ((o)&0x60)
97 #define IPOPT_NUMBER(o) ((o)&0x1f)
98  
99 #define IPOPT_CONTROL 0x00
100 #define IPOPT_RESERVED1 0x20
101 #define IPOPT_DEBMEAS 0x40
102 #define IPOPT_RESERVED2 0x60
103  
104 #define IPOPT_EOL 0 /* end of option list */
105 #define IPOPT_NOP 1 /* no operation */
106  
107 #define IPOPT_RR 7 /* record packet route */
108 #define IPOPT_TS 68 /* timestamp */
109 #define IPOPT_RFC1393 82 /* traceroute RFC 1393 */
110 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
111 #define IPOPT_LSRR 131 /* loose source route */
112 #define IPOPT_SATID 136 /* satnet id */
113 #define IPOPT_SSRR 137 /* strict source route */
114 #define IPOPT_RA 148 /* router-alert, rfc2113 */
115  
116 /*
117 * Offsets to fields in options other than EOL and NOP.
118 */
119 #define IPOPT_OPTVAL 0 /* option ID */
120 #define IPOPT_OLEN 1 /* option length */
121 #define IPOPT_OFFSET 2 /* offset within option */
122 #define IPOPT_MINOFF 4 /* min value of above */
123  
124 /*
125 * Time stamp option structure.
126 */
127 struct ip_timestamp {
128 uint8_t ipt_code; /* IPOPT_TS */
129 uint8_t ipt_len; /* size of structure (variable) */
130 uint8_t ipt_ptr; /* index of current entry */
131 uint8_t ipt_oflwflg; /* flags, overflow counter */
132 #define IPTS_OFLW(ip) (((ipt)->ipt_oflwflg & 0xf0) >> 4)
133 #define IPTS_FLG(ip) ((ipt)->ipt_oflwflg & 0x0f)
134 union ipt_timestamp {
135 uint32_t ipt_time[1];
136 struct ipt_ta {
137 struct in_addr ipt_addr;
138 uint32_t ipt_time;
139 } ipt_ta[1];
140 } ipt_timestamp;
141 } UNALIGNED;
142  
143 /* flag bits for ipt_flg */
144 #define IPOPT_TS_TSONLY 0 /* timestamps only */
145 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
146 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
147  
148 /* bits for security (not byte swapped) */
149 #define IPOPT_SECUR_UNCLASS 0x0000
150 #define IPOPT_SECUR_CONFID 0xf135
151 #define IPOPT_SECUR_EFTO 0x789a
152 #define IPOPT_SECUR_MMMM 0xbc4d
153 #define IPOPT_SECUR_RESTR 0xaf13
154 #define IPOPT_SECUR_SECRET 0xd788
155 #define IPOPT_SECUR_TOPSECRET 0x6bc5
156  
157 /*
158 * Internet implementation parameters.
159 */
160 #define MAXTTL 255 /* maximum time to live (seconds) */
161 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
162 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
163 #define IPTTLDEC 1 /* subtracted when forwarding */
164  
165 #define IP_MSS 576 /* default maximum segment size */
166 #endif /* TCPDUMP_IP_H */