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 this notice is preserved and that due credit is given 7 * to the University of California at Berkeley. The name of the University 8 * may not be used to endorse or promote products derived from this 9 * software without specific prior written permission. This software 10 * is provided ``as is'' without express or implied warranty. 11 * 12 * @(#)ip_icmp.h 7.3 (Berkeley) 12/07/87 13 */ 14 15 /* 16 * Interface Control Message Protocol Definitions. 17 * Per RFC 792, September 1981. 18 */ 19 20 /* 21 * Structure of an icmp header. 22 */ 23 struct icmp { 24 u_char icmp_type; /* type of message, see below */ 25 u_char icmp_code; /* type sub code */ 26 u_short icmp_cksum; /* ones complement cksum of struct */ 27 union { 28 u_char ih_pptr; /* ICMP_PARAMPROB */ 29 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 30 struct ih_idseq { 31 n_short icd_id; 32 n_short icd_seq; 33 } ih_idseq; 34 int ih_void; 35 } icmp_hun; 36 #define icmp_pptr icmp_hun.ih_pptr 37 #define icmp_gwaddr icmp_hun.ih_gwaddr 38 #define icmp_id icmp_hun.ih_idseq.icd_id 39 #define icmp_seq icmp_hun.ih_idseq.icd_seq 40 #define icmp_void icmp_hun.ih_void 41 union { 42 struct id_ts { 43 n_time its_otime; 44 n_time its_rtime; 45 n_time its_ttime; 46 } id_ts; 47 struct id_ip { 48 struct ip idi_ip; 49 /* options and then 64 bits of data */ 50 } id_ip; 51 u_long id_mask; 52 char id_data[1]; 53 } icmp_dun; 54 #define icmp_otime icmp_dun.id_ts.its_otime 55 #define icmp_rtime icmp_dun.id_ts.its_rtime 56 #define icmp_ttime icmp_dun.id_ts.its_ttime 57 #define icmp_ip icmp_dun.id_ip.idi_ip 58 #define icmp_mask icmp_dun.id_mask 59 #define icmp_data icmp_dun.id_data 60 }; 61 62 /* 63 * Lower bounds on packet lengths for various types. 64 * For the error advice packets must first insure that the 65 * packet is large enought to contain the returned ip header. 66 * Only then can we do the check to see if 64 bits of packet 67 * data have been returned, since we need to check the returned 68 * ip header length. 69 */ 70 #define ICMP_MINLEN 8 /* abs minimum */ 71 #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */ 72 #define ICMP_MASKLEN 12 /* address mask */ 73 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 74 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 75 /* N.B.: must separately check that ip_hl >= 5 */ 76 77 /* 78 * Definition of type and code field values. 79 */ 80 #define ICMP_ECHOREPLY 0 /* echo reply */ 81 #define ICMP_UNREACH 3 /* dest unreachable, codes: */ 82 #define ICMP_UNREACH_NET 0 /* bad net */ 83 #define ICMP_UNREACH_HOST 1 /* bad host */ 84 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 85 #define ICMP_UNREACH_PORT 3 /* bad port */ 86 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 87 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 88 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 89 #define ICMP_REDIRECT 5 /* shorter route, codes: */ 90 #define ICMP_REDIRECT_NET 0 /* for network */ 91 #define ICMP_REDIRECT_HOST 1 /* for host */ 92 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 93 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 94 #define ICMP_ECHO 8 /* echo service */ 95 #define ICMP_TIMXCEED 11 /* time exceeded, code: */ 96 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 97 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 98 #define ICMP_PARAMPROB 12 /* ip header bad */ 99 #define ICMP_TSTAMP 13 /* timestamp request */ 100 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 101 #define ICMP_IREQ 15 /* information request */ 102 #define ICMP_IREQREPLY 16 /* information reply */ 103 #define ICMP_MASKREQ 17 /* address mask request */ 104 #define ICMP_MASKREPLY 18 /* address mask reply */ 105 106 #define ICMP_MAXTYPE 18 107 108 #define ICMP_INFOTYPE(type) \ 109 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 110 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 111 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 112 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 113