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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*
27: * Copyright (c) 1982, 1986, 1993
28: * The Regents of the University of California. All rights reserved.
29: *
30: * Redistribution and use in source and binary forms, with or without
31: * modification, are permitted provided that the following conditions
32: * are met:
33: * 1. Redistributions of source code must retain the above copyright
34: * notice, this list of conditions and the following disclaimer.
35: * 2. Redistributions in binary form must reproduce the above copyright
36: * notice, this list of conditions and the following disclaimer in the
37: * documentation and/or other materials provided with the distribution.
38: * 3. All advertising materials mentioning features or use of this software
39: * must display the following acknowledgement:
40: * This product includes software developed by the University of
41: * California, Berkeley and its contributors.
42: * 4. Neither the name of the University nor the names of its contributors
43: * may be used to endorse or promote products derived from this software
44: * without specific prior written permission.
45: *
46: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56: * SUCH DAMAGE.
57: *
58: * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93
59: */
60:
61: /*
62: * Interface Control Message Protocol Definitions.
63: * Per RFC 792, September 1981.
64: */
65:
66: /*
67: * Structure of an icmp header.
68: */
69: struct icmp {
70: u_char icmp_type; /* type of message, see below */
71: u_char icmp_code; /* type sub code */
72: u_short icmp_cksum; /* ones complement cksum of struct */
73: union {
74: u_char ih_pptr; /* ICMP_PARAMPROB */
75: struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
76: struct ih_idseq {
77: n_short icd_id;
78: n_short icd_seq;
79: } ih_idseq;
80: int ih_void;
81:
82: /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
83: struct ih_pmtu {
84: n_short ipm_void;
85: n_short ipm_nextmtu;
86: } ih_pmtu;
87: } icmp_hun;
88: #define icmp_pptr icmp_hun.ih_pptr
89: #define icmp_gwaddr icmp_hun.ih_gwaddr
90: #define icmp_id icmp_hun.ih_idseq.icd_id
91: #define icmp_seq icmp_hun.ih_idseq.icd_seq
92: #define icmp_void icmp_hun.ih_void
93: #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
94: #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
95: union {
96: struct id_ts {
97: n_time its_otime;
98: n_time its_rtime;
99: n_time its_ttime;
100: } id_ts;
101: struct id_ip {
102: struct ip idi_ip;
103: /* options and then 64 bits of data */
104: } id_ip;
105: u_long id_mask;
106: char id_data[1];
107: } icmp_dun;
108: #define icmp_otime icmp_dun.id_ts.its_otime
109: #define icmp_rtime icmp_dun.id_ts.its_rtime
110: #define icmp_ttime icmp_dun.id_ts.its_ttime
111: #define icmp_ip icmp_dun.id_ip.idi_ip
112: #define icmp_mask icmp_dun.id_mask
113: #define icmp_data icmp_dun.id_data
114: };
115:
116: /*
117: * Lower bounds on packet lengths for various types.
118: * For the error advice packets must first insure that the
119: * packet is large enought to contain the returned ip header.
120: * Only then can we do the check to see if 64 bits of packet
121: * data have been returned, since we need to check the returned
122: * ip header length.
123: */
124: #define ICMP_MINLEN 8 /* abs minimum */
125: #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
126: #define ICMP_MASKLEN 12 /* address mask */
127: #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
128: #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
129: /* N.B.: must separately check that ip_hl >= 5 */
130:
131: /*
132: * Definition of type and code field values.
133: */
134: #define ICMP_ECHOREPLY 0 /* echo reply */
135: #define ICMP_UNREACH 3 /* dest unreachable, codes: */
136: #define ICMP_UNREACH_NET 0 /* bad net */
137: #define ICMP_UNREACH_HOST 1 /* bad host */
138: #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
139: #define ICMP_UNREACH_PORT 3 /* bad port */
140: #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
141: #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
142: #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
143: #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
144: #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
145: #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
146: #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
147: #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
148: #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
149: #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
150: #define ICMP_REDIRECT 5 /* shorter route, codes: */
151: #define ICMP_REDIRECT_NET 0 /* for network */
152: #define ICMP_REDIRECT_HOST 1 /* for host */
153: #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
154: #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
155: #define ICMP_ECHO 8 /* echo service */
156: #define ICMP_ROUTERADVERT 9 /* router advertisement */
157: #define ICMP_ROUTERSOLICIT 10 /* router solicitation */
158: #define ICMP_TIMXCEED 11 /* time exceeded, code: */
159: #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
160: #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
161: #define ICMP_PARAMPROB 12 /* ip header bad */
162: #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
163: #define ICMP_TSTAMP 13 /* timestamp request */
164: #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
165: #define ICMP_IREQ 15 /* information request */
166: #define ICMP_IREQREPLY 16 /* information reply */
167: #define ICMP_MASKREQ 17 /* address mask request */
168: #define ICMP_MASKREPLY 18 /* address mask reply */
169:
170: #define ICMP_MAXTYPE 18
171:
172: #define ICMP_INFOTYPE(type) \
173: ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
174: (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
175: (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
176: (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
177: (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
178:
179: #ifdef _KERNEL
180: void icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *));
181: void icmp_input __P((struct mbuf *, int));
182: void icmp_reflect __P((struct mbuf *));
183: void icmp_send __P((struct mbuf *, struct mbuf *));
184: int icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
185: #endif
186:
187: #define ICMP_NETMASK_RETRY_MAX 5 /* Max. retries for getting netmask */
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