1: /* $NetBSD: ip_icmp.h,v 1.11 1996/08/03 15:48:18 neil 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. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
35: * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93
36: */
37:
38:
39: /*
40: * Interface Control Message Protocol Definitions.
41: * Per RFC 792, September 1981.
42: */
43:
44: /*
45: * Internal of an ICMP Router Advertisement
46: */
47: struct icmp_ra_addr {
48: u_int32_t ira_addr;
49: u_int32_t ira_preference;
50: };
51:
52: /*
53: * Structure of an icmp header.
54: */
55: struct icmp {
56: u_int8_t icmp_type; /* type of message, see below */
57: u_int8_t icmp_code; /* type sub code */
58: u_int16_t icmp_cksum; /* ones complement cksum of struct */
59: union {
60: u_int8_t ih_pptr; /* ICMP_PARAMPROB */
61: struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
62: struct ih_idseq {
63: int16_t icd_id;
64: int16_t icd_seq;
65: } ih_idseq;
66: int32_t ih_void;
67:
68: /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
69: struct ih_pmtu {
70: int16_t ipm_void;
71: int16_t ipm_nextmtu;
72: } ih_pmtu;
73: struct ih_rtradv {
74: u_int8_t irt_num_addrs;
75: u_int8_t irt_wpa;
76: u_int16_t irt_lifetime;
77: } ih_rtradv;
78: } icmp_hun;
79: #define icmp_pptr icmp_hun.ih_pptr
80: #define icmp_gwaddr icmp_hun.ih_gwaddr
81: #define icmp_id icmp_hun.ih_idseq.icd_id
82: #define icmp_seq icmp_hun.ih_idseq.icd_seq
83: #define icmp_void icmp_hun.ih_void
84: #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
85: #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
86: #define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs
87: #define icmp_wpa icmp_hun.ih_rtradv.irt_wpa
88: #define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime
89: union {
90: struct id_ts {
91: u_int32_t its_otime;
92: u_int32_t its_rtime;
93: u_int32_t its_ttime;
94: } id_ts;
95: struct id_ip {
96: struct ip idi_ip;
97: /* options and then 64 bits of data */
98: } id_ip;
99: struct icmp_ra_addr id_radv;
100: u_int32_t id_mask;
101: int8_t id_data[1];
102: } icmp_dun;
103: #define icmp_otime icmp_dun.id_ts.its_otime
104: #define icmp_rtime icmp_dun.id_ts.its_rtime
105: #define icmp_ttime icmp_dun.id_ts.its_ttime
106: #define icmp_ip icmp_dun.id_ip.idi_ip
107: #define icmp_radv icmp_dun.id_mask
108: #define icmp_mask icmp_dun.id_mask
109: #define icmp_data icmp_dun.id_data
110: };
111:
112: /*
113: * Lower bounds on packet lengths for various types.
114: * For the error advice packets must first insure that the
115: * packet is large enought to contain the returned ip header.
116: * Only then can we do the check to see if 64 bits of packet
117: * data have been returned, since we need to check the returned
118: * ip header length.
119: */
120: #define ICMP_MINLEN 8 /* abs minimum */
121: #define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */
122: #define ICMP_MASKLEN 12 /* address mask */
123: #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
124: #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
125: /* N.B.: must separately check that ip_hl >= 5 */
126:
127: /*
128: * Definition of type and code field values.
129: */
130: #define ICMP_ECHOREPLY 0 /* echo reply */
131: #define ICMP_UNREACH 3 /* dest unreachable, codes: */
132: #define ICMP_UNREACH_NET 0 /* bad net */
133: #define ICMP_UNREACH_HOST 1 /* bad host */
134: #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
135: #define ICMP_UNREACH_PORT 3 /* bad port */
136: #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
137: #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
138: #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
139: #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
140: #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
141: #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
142: #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
143: #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
144: #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
145: #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
146: #define ICMP_REDIRECT 5 /* shorter route, codes: */
147: #define ICMP_REDIRECT_NET 0 /* for network */
148: #define ICMP_REDIRECT_HOST 1 /* for host */
149: #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
150: #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
151: #define ICMP_ECHO 8 /* echo service */
152: #define ICMP_ROUTERADVERT 9 /* router advertisement */
153: #define ICMP_ROUTERSOLICIT 10 /* router solicitation */
154: #define ICMP_TIMXCEED 11 /* time exceeded, code: */
155: #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
156: #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
157: #define ICMP_PARAMPROB 12 /* ip header bad */
158: #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
159: #define ICMP_TSTAMP 13 /* timestamp request */
160: #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
161: #define ICMP_IREQ 15 /* information request */
162: #define ICMP_IREQREPLY 16 /* information reply */
163: #define ICMP_MASKREQ 17 /* address mask request */
164: #define ICMP_MASKREPLY 18 /* address mask reply */
165:
166: #define ICMP_MAXTYPE 18
167:
168: #define ICMP_INFOTYPE(type) \
169: ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
170: (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
171: (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
172: (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
173: (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
174:
175: #ifdef _KERNEL
176: void icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *));
177: void icmp_input __P((struct mbuf *, ...));
178: void icmp_reflect __P((struct mbuf *));
179: void icmp_send __P((struct mbuf *, struct mbuf *));
180: int icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
181: #endif
182:
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