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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 are permitted
6: * provided that the above copyright notice and this paragraph are
7: * duplicated in all such forms and that any documentation,
8: * advertising materials, and other materials related to such
9: * distribution and use acknowledge that the software was developed
10: * by the University of California, Berkeley. The name of the
11: * University may not be used to endorse or promote products derived
12: * from this software without specific prior written permission.
13: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15: * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16: *
17: * @(#)ip_icmp.h 7.4 (Berkeley) 6/29/88
18: */
19:
20: /*
21: * Interface Control Message Protocol Definitions.
22: * Per RFC 792, September 1981.
23: */
24:
25: /*
26: * Structure of an icmp header.
27: */
28: struct icmp {
29: u_char icmp_type; /* type of message, see below */
30: u_char icmp_code; /* type sub code */
31: u_short icmp_cksum; /* ones complement cksum of struct */
32: union {
33: u_char ih_pptr; /* ICMP_PARAMPROB */
34: struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
35: struct ih_idseq {
36: n_short icd_id;
37: n_short icd_seq;
38: } ih_idseq;
39: int ih_void;
40: } icmp_hun;
41: #define icmp_pptr icmp_hun.ih_pptr
42: #define icmp_gwaddr icmp_hun.ih_gwaddr
43: #define icmp_id icmp_hun.ih_idseq.icd_id
44: #define icmp_seq icmp_hun.ih_idseq.icd_seq
45: #define icmp_void icmp_hun.ih_void
46: union {
47: struct id_ts {
48: n_time its_otime;
49: n_time its_rtime;
50: n_time its_ttime;
51: } id_ts;
52: struct id_ip {
53: struct ip idi_ip;
54: /* options and then 64 bits of data */
55: } id_ip;
56: u_long id_mask;
57: char id_data[1];
58: } icmp_dun;
59: #define icmp_otime icmp_dun.id_ts.its_otime
60: #define icmp_rtime icmp_dun.id_ts.its_rtime
61: #define icmp_ttime icmp_dun.id_ts.its_ttime
62: #define icmp_ip icmp_dun.id_ip.idi_ip
63: #define icmp_mask icmp_dun.id_mask
64: #define icmp_data icmp_dun.id_data
65: };
66:
67: /*
68: * Lower bounds on packet lengths for various types.
69: * For the error advice packets must first insure that the
70: * packet is large enought to contain the returned ip header.
71: * Only then can we do the check to see if 64 bits of packet
72: * data have been returned, since we need to check the returned
73: * ip header length.
74: */
75: #define ICMP_MINLEN 8 /* abs minimum */
76: #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
77: #define ICMP_MASKLEN 12 /* address mask */
78: #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
79: #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
80: /* N.B.: must separately check that ip_hl >= 5 */
81:
82: /*
83: * Definition of type and code field values.
84: */
85: #define ICMP_ECHOREPLY 0 /* echo reply */
86: #define ICMP_UNREACH 3 /* dest unreachable, codes: */
87: #define ICMP_UNREACH_NET 0 /* bad net */
88: #define ICMP_UNREACH_HOST 1 /* bad host */
89: #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
90: #define ICMP_UNREACH_PORT 3 /* bad port */
91: #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
92: #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
93: #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
94: #define ICMP_REDIRECT 5 /* shorter route, codes: */
95: #define ICMP_REDIRECT_NET 0 /* for network */
96: #define ICMP_REDIRECT_HOST 1 /* for host */
97: #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
98: #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
99: #define ICMP_ECHO 8 /* echo service */
100: #define ICMP_TIMXCEED 11 /* time exceeded, code: */
101: #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
102: #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
103: #define ICMP_PARAMPROB 12 /* ip header bad */
104: #define ICMP_TSTAMP 13 /* timestamp request */
105: #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
106: #define ICMP_IREQ 15 /* information request */
107: #define ICMP_IREQREPLY 16 /* information reply */
108: #define ICMP_MASKREQ 17 /* address mask request */
109: #define ICMP_MASKREPLY 18 /* address mask reply */
110:
111: #define ICMP_MAXTYPE 18
112:
113: #define ICMP_INFOTYPE(type) \
114: ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
115: (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
116: (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
117: (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
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