1 /* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)ip_icmp.h 8.1 (Berkeley) 06/10/93 8 */ 9 10 /* 11 * Interface Control Message Protocol Definitions. 12 * Per RFC 792, September 1981. 13 */ 14 15 /* 16 * Structure of an icmp header. 17 */ 18 struct icmp { 19 u_char icmp_type; /* type of message, see below */ 20 u_char icmp_code; /* type sub code */ 21 u_short icmp_cksum; /* ones complement cksum of struct */ 22 union { 23 u_char ih_pptr; /* ICMP_PARAMPROB */ 24 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 25 struct ih_idseq { 26 n_short icd_id; 27 n_short icd_seq; 28 } ih_idseq; 29 int ih_void; 30 31 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 32 struct ih_pmtu { 33 n_short ipm_void; 34 n_short ipm_nextmtu; 35 } ih_pmtu; 36 } icmp_hun; 37 #define icmp_pptr icmp_hun.ih_pptr 38 #define icmp_gwaddr icmp_hun.ih_gwaddr 39 #define icmp_id icmp_hun.ih_idseq.icd_id 40 #define icmp_seq icmp_hun.ih_idseq.icd_seq 41 #define icmp_void icmp_hun.ih_void 42 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 43 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 44 union { 45 struct id_ts { 46 n_time its_otime; 47 n_time its_rtime; 48 n_time its_ttime; 49 } id_ts; 50 struct id_ip { 51 struct ip idi_ip; 52 /* options and then 64 bits of data */ 53 } id_ip; 54 u_long id_mask; 55 char id_data[1]; 56 } icmp_dun; 57 #define icmp_otime icmp_dun.id_ts.its_otime 58 #define icmp_rtime icmp_dun.id_ts.its_rtime 59 #define icmp_ttime icmp_dun.id_ts.its_ttime 60 #define icmp_ip icmp_dun.id_ip.idi_ip 61 #define icmp_mask icmp_dun.id_mask 62 #define icmp_data icmp_dun.id_data 63 }; 64 65 /* 66 * Lower bounds on packet lengths for various types. 67 * For the error advice packets must first insure that the 68 * packet is large enought to contain the returned ip header. 69 * Only then can we do the check to see if 64 bits of packet 70 * data have been returned, since we need to check the returned 71 * ip header length. 72 */ 73 #define ICMP_MINLEN 8 /* abs minimum */ 74 #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */ 75 #define ICMP_MASKLEN 12 /* address mask */ 76 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 77 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 78 /* N.B.: must separately check that ip_hl >= 5 */ 79 80 /* 81 * Definition of type and code field values. 82 */ 83 #define ICMP_ECHOREPLY 0 /* echo reply */ 84 #define ICMP_UNREACH 3 /* dest unreachable, codes: */ 85 #define ICMP_UNREACH_NET 0 /* bad net */ 86 #define ICMP_UNREACH_HOST 1 /* bad host */ 87 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 88 #define ICMP_UNREACH_PORT 3 /* bad port */ 89 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 90 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 91 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 92 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 93 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 94 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ 95 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 96 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 97 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 98 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 99 #define ICMP_REDIRECT 5 /* shorter route, codes: */ 100 #define ICMP_REDIRECT_NET 0 /* for network */ 101 #define ICMP_REDIRECT_HOST 1 /* for host */ 102 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 103 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 104 #define ICMP_ECHO 8 /* echo service */ 105 #define ICMP_ROUTERADVERT 9 /* router advertisement */ 106 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 107 #define ICMP_TIMXCEED 11 /* time exceeded, code: */ 108 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 109 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 110 #define ICMP_PARAMPROB 12 /* ip header bad */ 111 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 112 #define ICMP_TSTAMP 13 /* timestamp request */ 113 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 114 #define ICMP_IREQ 15 /* information request */ 115 #define ICMP_IREQREPLY 16 /* information reply */ 116 #define ICMP_MASKREQ 17 /* address mask request */ 117 #define ICMP_MASKREPLY 18 /* address mask reply */ 118 119 #define ICMP_MAXTYPE 18 120 121 #define ICMP_INFOTYPE(type) \ 122 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 123 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 124 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 125 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 126 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 127 128 #ifdef KERNEL 129 void icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *)); 130 void icmp_input __P((struct mbuf *, int)); 131 void icmp_reflect __P((struct mbuf *)); 132 void icmp_send __P((struct mbuf *, struct mbuf *)); 133 int icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 134 #endif 135