source: trunk/src/icmp/icmp.h

Last change on this file was 3570, checked in by jeroen, 25 years ago

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File size: 8.6 KB
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[3570]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_icmp.h 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/netinet/ip_icmp.h,v 1.13 1999/08/28 00:49:24 peter Exp $
35 */
36
37/*
38 * Interface Control Message Protocol Definitions.
39 * Per RFC 792, September 1981.
40 */
41
42/* Some internal defs */
43#define u_int16_t WORD
44#define u_int32_t DWORD
45
46/*
47 * Internal of an ICMP Router Advertisement
48 */
49struct icmp_ra_addr {
50 u_int32_t ira_addr;
51 u_int32_t ira_preference;
52};
53
54/*
55 * Structure of an icmp header.
56 */
57struct icmp {
58 u_char icmp_type; /* type of message, see below */
59 u_char icmp_code; /* type sub code */
60 u_short icmp_cksum; /* ones complement cksum of struct */
61 union {
62 u_char ih_pptr; /* ICMP_PARAMPROB */
63 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
64 struct ih_idseq {
65 n_short icd_id;
66 n_short icd_seq;
67 } ih_idseq;
68 int ih_void;
69
70 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
71 struct ih_pmtu {
72 n_short ipm_void;
73 n_short ipm_nextmtu;
74 } ih_pmtu;
75
76 struct ih_rtradv {
77 u_char irt_num_addrs;
78 u_char irt_wpa;
79 u_int16_t irt_lifetime;
80 } ih_rtradv;
81 } icmp_hun;
82#define icmp_pptr icmp_hun.ih_pptr
83#define icmp_gwaddr icmp_hun.ih_gwaddr
84#define icmp_id icmp_hun.ih_idseq.icd_id
85#define icmp_seq icmp_hun.ih_idseq.icd_seq
86#define icmp_void icmp_hun.ih_void
87#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
88#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
89#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs
90#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa
91#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime
92 union {
93 struct id_ts {
94 n_time its_otime;
95 n_time its_rtime;
96 n_time its_ttime;
97 } id_ts;
98 struct id_ip {
99 struct ip idi_ip;
100 /* options and then 64 bits of data */
101 } id_ip;
102 struct icmp_ra_addr id_radv;
103 u_int32_t id_mask;
104 char id_data[1];
105 } icmp_dun;
106#define icmp_otime icmp_dun.id_ts.its_otime
107#define icmp_rtime icmp_dun.id_ts.its_rtime
108#define icmp_ttime icmp_dun.id_ts.its_ttime
109#define icmp_ip icmp_dun.id_ip.idi_ip
110#define icmp_radv icmp_dun.id_radv
111#define icmp_mask icmp_dun.id_mask
112#define icmp_data icmp_dun.id_data
113};
114
115/*
116 * Lower bounds on packet lengths for various types.
117 * For the error advice packets must first insure that the
118 * packet is large enough to contain the returned ip header.
119 * Only then can we do the check to see if 64 bits of packet
120 * data have been returned, since we need to check the returned
121 * ip header length.
122 */
123#define ICMP_MINLEN 8 /* abs minimum */
124#define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
125#define ICMP_MASKLEN 12 /* address mask */
126#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
127#ifndef _IP_VHL
128#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
129 /* N.B.: must separately check that ip_hl >= 5 */
130#else
131#define ICMP_ADVLEN(p) (8 + (IP_VHL_HL((p)->icmp_ip.ip_vhl) << 2) + 8)
132 /* N.B.: must separately check that header length >= 5 */
133#endif
134
135/*
136 * Definition of type and code field values.
137 */
138#define ICMP_ECHOREPLY 0 /* echo reply */
139#define ICMP_UNREACH 3 /* dest unreachable, codes: */
140#define ICMP_UNREACH_NET 0 /* bad net */
141#define ICMP_UNREACH_HOST 1 /* bad host */
142#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
143#define ICMP_UNREACH_PORT 3 /* bad port */
144#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
145#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
146#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
147#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
148#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
149#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
150#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
151#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
152#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
153#define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohib */
154#define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host prec vio. */
155#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* prec cutoff */
156#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
157#define ICMP_REDIRECT 5 /* shorter route, codes: */
158#define ICMP_REDIRECT_NET 0 /* for network */
159#define ICMP_REDIRECT_HOST 1 /* for host */
160#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
161#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
162#define ICMP_ECHO 8 /* echo service */
163#define ICMP_ROUTERADVERT 9 /* router advertisement */
164#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
165#define ICMP_TIMXCEED 11 /* time exceeded, code: */
166#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
167#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
168#define ICMP_PARAMPROB 12 /* ip header bad */
169#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
170#define ICMP_TSTAMP 13 /* timestamp request */
171#define ICMP_TSTAMPREPLY 14 /* timestamp reply */
172#define ICMP_IREQ 15 /* information request */
173#define ICMP_IREQREPLY 16 /* information reply */
174#define ICMP_MASKREQ 17 /* address mask request */
175#define ICMP_MASKREPLY 18 /* address mask reply */
176
177#define ICMP_MAXTYPE 18
178
179#define ICMP_INFOTYPE(type) \
180 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
181 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
182 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
183 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
184 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
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