Move tcpdump-3.9/ to tcpdump/. No need for a versioned dir.
[dragonfly.git] / contrib / tcpdump / ip.h
CommitLineData
825e8fa1 1/* @(#) $Header: /tcpdump/master/tcpdump/ip.h,v 1.11.2.1 2007/09/14 01:30:02 guy Exp $ (LBL) */
c8cf0f94
PA
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 */
50struct 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 */
825e8fa1 105#define IPOPT_RFC1393 82 /* traceroute RFC 1393 */
c8cf0f94
PA
106#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
107#define IPOPT_LSRR 131 /* loose source route */
108#define IPOPT_SATID 136 /* satnet id */
109#define IPOPT_SSRR 137 /* strict source route */
110#define IPOPT_RA 148 /* router-alert, rfc2113 */
111
112/*
113 * Offsets to fields in options other than EOL and NOP.
114 */
115#define IPOPT_OPTVAL 0 /* option ID */
116#define IPOPT_OLEN 1 /* option length */
117#define IPOPT_OFFSET 2 /* offset within option */
118#define IPOPT_MINOFF 4 /* min value of above */
119
120/*
121 * Time stamp option structure.
122 */
123struct ip_timestamp {
124 u_int8_t ipt_code; /* IPOPT_TS */
125 u_int8_t ipt_len; /* size of structure (variable) */
126 u_int8_t ipt_ptr; /* index of current entry */
127 u_int8_t ipt_oflwflg; /* flags, overflow counter */
128#define IPTS_OFLW(ip) (((ipt)->ipt_oflwflg & 0xf0) >> 4)
129#define IPTS_FLG(ip) ((ipt)->ipt_oflwflg & 0x0f)
130 union ipt_timestamp {
131 u_int32_t ipt_time[1];
132 struct ipt_ta {
133 struct in_addr ipt_addr;
134 u_int32_t ipt_time;
135 } ipt_ta[1];
136 } ipt_timestamp;
137};
138
139/* flag bits for ipt_flg */
140#define IPOPT_TS_TSONLY 0 /* timestamps only */
141#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
142#define IPOPT_TS_PRESPEC 3 /* specified modules only */
143
144/* bits for security (not byte swapped) */
145#define IPOPT_SECUR_UNCLASS 0x0000
146#define IPOPT_SECUR_CONFID 0xf135
147#define IPOPT_SECUR_EFTO 0x789a
148#define IPOPT_SECUR_MMMM 0xbc4d
149#define IPOPT_SECUR_RESTR 0xaf13
150#define IPOPT_SECUR_SECRET 0xd788
151#define IPOPT_SECUR_TOPSECRET 0x6bc5
152
153/*
154 * Internet implementation parameters.
155 */
156#define MAXTTL 255 /* maximum time to live (seconds) */
157#define IPDEFTTL 64 /* default ttl, from RFC 1340 */
158#define IPFRAGTTL 60 /* time to live for frags, slowhz */
159#define IPTTLDEC 1 /* subtracted when forwarding */
160
161#define IP_MSS 576 /* default maximum segment size */
162
163/* in print-ip.c */
164extern u_int32_t ip_finddst(const struct ip *);