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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 is only permitted until one year after the first shipment
6: * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
7: * binary forms are permitted provided that: (1) source distributions retain
8: * this entire copyright notice and comment, and (2) distributions including
9: * binaries display the following acknowledgement: This product includes
10: * software developed by the University of California, Berkeley and its
11: * contributors'' in the documentation or other materials provided with the
12: * distribution and in all advertising materials mentioning features or use
13: * of this software. Neither the name of the University nor the names of
14: * its contributors may be used to endorse or promote products derived from
15: * this software without specific prior written permission.
16: * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
17: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
18: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19: *
20: * @(#)ip_icmp.h 7.5 (Berkeley) 6/28/90
21: */
22:
23: /*
24: * Interface Control Message Protocol Definitions.
25: * Per RFC 792, September 1981.
26: */
27:
28: /*
29: * Structure of an icmp header.
30: */
31: struct icmp {
32: u_char icmp_type; /* type of message, see below */
33: u_char icmp_code; /* type sub code */
34: u_short icmp_cksum; /* ones complement cksum of struct */
35: union {
36: u_char ih_pptr; /* ICMP_PARAMPROB */
37: struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
38: struct ih_idseq {
39: n_short icd_id;
40: n_short icd_seq;
41: } ih_idseq;
42: int ih_void;
43: } icmp_hun;
44: #define icmp_pptr icmp_hun.ih_pptr
45: #define icmp_gwaddr icmp_hun.ih_gwaddr
46: #define icmp_id icmp_hun.ih_idseq.icd_id
47: #define icmp_seq icmp_hun.ih_idseq.icd_seq
48: #define icmp_void icmp_hun.ih_void
49: union {
50: struct id_ts {
51: n_time its_otime;
52: n_time its_rtime;
53: n_time its_ttime;
54: } id_ts;
55: struct id_ip {
56: struct ip idi_ip;
57: /* options and then 64 bits of data */
58: } id_ip;
59: u_long id_mask;
60: char id_data[1];
61: } icmp_dun;
62: #define icmp_otime icmp_dun.id_ts.its_otime
63: #define icmp_rtime icmp_dun.id_ts.its_rtime
64: #define icmp_ttime icmp_dun.id_ts.its_ttime
65: #define icmp_ip icmp_dun.id_ip.idi_ip
66: #define icmp_mask icmp_dun.id_mask
67: #define icmp_data icmp_dun.id_data
68: };
69:
70: /*
71: * Lower bounds on packet lengths for various types.
72: * For the error advice packets must first insure that the
73: * packet is large enought to contain the returned ip header.
74: * Only then can we do the check to see if 64 bits of packet
75: * data have been returned, since we need to check the returned
76: * ip header length.
77: */
78: #define ICMP_MINLEN 8 /* abs minimum */
79: #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
80: #define ICMP_MASKLEN 12 /* address mask */
81: #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
82: #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
83: /* N.B.: must separately check that ip_hl >= 5 */
84:
85: /*
86: * Definition of type and code field values.
87: */
88: #define ICMP_ECHOREPLY 0 /* echo reply */
89: #define ICMP_UNREACH 3 /* dest unreachable, codes: */
90: #define ICMP_UNREACH_NET 0 /* bad net */
91: #define ICMP_UNREACH_HOST 1 /* bad host */
92: #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
93: #define ICMP_UNREACH_PORT 3 /* bad port */
94: #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
95: #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
96: #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
97: #define ICMP_REDIRECT 5 /* shorter route, codes: */
98: #define ICMP_REDIRECT_NET 0 /* for network */
99: #define ICMP_REDIRECT_HOST 1 /* for host */
100: #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
101: #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
102: #define ICMP_ECHO 8 /* echo service */
103: #define ICMP_TIMXCEED 11 /* time exceeded, code: */
104: #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
105: #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
106: #define ICMP_PARAMPROB 12 /* ip header bad */
107: #define ICMP_TSTAMP 13 /* timestamp request */
108: #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
109: #define ICMP_IREQ 15 /* information request */
110: #define ICMP_IREQREPLY 16 /* information reply */
111: #define ICMP_MASKREQ 17 /* address mask request */
112: #define ICMP_MASKREPLY 18 /* address mask reply */
113:
114: #define ICMP_MAXTYPE 18
115:
116: #define ICMP_INFOTYPE(type) \
117: ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
118: (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
119: (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
120: (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
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