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1.1 root 1: /*
2: * Copyright (c) 1982, 1986 Regents of the University of California.
3: * 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 7.5 (Berkeley) 6/28/90
34: */
35:
36: /*
37: * Interface Control Message Protocol Definitions.
38: * Per RFC 792, September 1981.
39: */
40:
41: /*
42: * Structure of an icmp header.
43: */
44: struct icmp {
45: u_char icmp_type; /* type of message, see below */
46: u_char icmp_code; /* type sub code */
47: u_short icmp_cksum; /* ones complement cksum of struct */
48: union {
49: u_char ih_pptr; /* ICMP_PARAMPROB */
50: struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
51: struct ih_idseq {
52: n_short icd_id;
53: n_short icd_seq;
54: } ih_idseq;
55: int ih_void;
56: } icmp_hun;
57: #define icmp_pptr icmp_hun.ih_pptr
58: #define icmp_gwaddr icmp_hun.ih_gwaddr
59: #define icmp_id icmp_hun.ih_idseq.icd_id
60: #define icmp_seq icmp_hun.ih_idseq.icd_seq
61: #define icmp_void icmp_hun.ih_void
62: union {
63: struct id_ts {
64: n_time its_otime;
65: n_time its_rtime;
66: n_time its_ttime;
67: } id_ts;
68: struct id_ip {
69: struct ip idi_ip;
70: /* options and then 64 bits of data */
71: } id_ip;
72: u_long id_mask;
73: char id_data[1];
74: } icmp_dun;
75: #define icmp_otime icmp_dun.id_ts.its_otime
76: #define icmp_rtime icmp_dun.id_ts.its_rtime
77: #define icmp_ttime icmp_dun.id_ts.its_ttime
78: #define icmp_ip icmp_dun.id_ip.idi_ip
79: #define icmp_mask icmp_dun.id_mask
80: #define icmp_data icmp_dun.id_data
81: };
82:
83: /*
84: * Lower bounds on packet lengths for various types.
85: * For the error advice packets must first insure that the
86: * packet is large enought to contain the returned ip header.
87: * Only then can we do the check to see if 64 bits of packet
88: * data have been returned, since we need to check the returned
89: * ip header length.
90: */
91: #define ICMP_MINLEN 8 /* abs minimum */
92: #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
93: #define ICMP_MASKLEN 12 /* address mask */
94: #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
95: #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
96: /* N.B.: must separately check that ip_hl >= 5 */
97:
98: /*
99: * Definition of type and code field values.
100: */
101: #define ICMP_ECHOREPLY 0 /* echo reply */
102: #define ICMP_UNREACH 3 /* dest unreachable, codes: */
103: #define ICMP_UNREACH_NET 0 /* bad net */
104: #define ICMP_UNREACH_HOST 1 /* bad host */
105: #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
106: #define ICMP_UNREACH_PORT 3 /* bad port */
107: #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
108: #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
109: #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
110: #define ICMP_REDIRECT 5 /* shorter route, codes: */
111: #define ICMP_REDIRECT_NET 0 /* for network */
112: #define ICMP_REDIRECT_HOST 1 /* for host */
113: #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
114: #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
115: #define ICMP_ECHO 8 /* echo service */
116: #define ICMP_TIMXCEED 11 /* time exceeded, code: */
117: #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
118: #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
119: #define ICMP_PARAMPROB 12 /* ip header bad */
120: #define ICMP_TSTAMP 13 /* timestamp request */
121: #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
122: #define ICMP_IREQ 15 /* information request */
123: #define ICMP_IREQREPLY 16 /* information reply */
124: #define ICMP_MASKREQ 17 /* address mask request */
125: #define ICMP_MASKREPLY 18 /* address mask reply */
126:
127: #define ICMP_MAXTYPE 18
128:
129: #define ICMP_INFOTYPE(type) \
130: ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
131: (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
132: (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
133: (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
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