1 /* $NetBSD: ip_icmp.h,v 1.11 1996/08/03 15:48:18 neil Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93 32 */ 33 34 35 /* 36 * Interface Control Message Protocol Definitions. 37 * Per RFC 792, September 1981. 38 */ 39 40 /* 41 * Internal of an ICMP Router Advertisement 42 */ 43 struct icmp_ra_addr { 44 u_int32_t ira_addr; 45 u_int32_t ira_preference; 46 }; 47 48 /* 49 * Structure of an icmp header. 50 */ 51 struct icmp { 52 u_int8_t icmp_type; /* type of message, see below */ 53 u_int8_t icmp_code; /* type sub code */ 54 u_int16_t icmp_cksum; /* ones complement cksum of struct */ 55 union { 56 u_int8_t ih_pptr; /* ICMP_PARAMPROB */ 57 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 58 struct ih_idseq { 59 int16_t icd_id; 60 int16_t icd_seq; 61 } ih_idseq; 62 int32_t ih_void; 63 64 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 65 struct ih_pmtu { 66 int16_t ipm_void; 67 int16_t ipm_nextmtu; 68 } ih_pmtu; 69 struct ih_rtradv { 70 u_int8_t irt_num_addrs; 71 u_int8_t irt_wpa; 72 u_int16_t irt_lifetime; 73 } ih_rtradv; 74 } icmp_hun; 75 #define icmp_pptr icmp_hun.ih_pptr 76 #define icmp_gwaddr icmp_hun.ih_gwaddr 77 #define icmp_id icmp_hun.ih_idseq.icd_id 78 #define icmp_seq icmp_hun.ih_idseq.icd_seq 79 #define icmp_void icmp_hun.ih_void 80 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 81 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 82 #define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs 83 #define icmp_wpa icmp_hun.ih_rtradv.irt_wpa 84 #define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime 85 union { 86 struct id_ts { 87 u_int32_t its_otime; 88 u_int32_t its_rtime; 89 u_int32_t its_ttime; 90 } id_ts; 91 struct id_ip { 92 struct ip idi_ip; 93 /* options and then 64 bits of data */ 94 } id_ip; 95 struct icmp_ra_addr id_radv; 96 u_int32_t id_mask; 97 int8_t id_data[1]; 98 } icmp_dun; 99 #define icmp_otime icmp_dun.id_ts.its_otime 100 #define icmp_rtime icmp_dun.id_ts.its_rtime 101 #define icmp_ttime icmp_dun.id_ts.its_ttime 102 #define icmp_ip icmp_dun.id_ip.idi_ip 103 #define icmp_radv icmp_dun.id_mask 104 #define icmp_mask icmp_dun.id_mask 105 #define icmp_data icmp_dun.id_data 106 }; 107 108 /* 109 * Lower bounds on packet lengths for various types. 110 * For the error advice packets must first insure that the 111 * packet is large enought to contain the returned ip header. 112 * Only then can we do the check to see if 64 bits of packet 113 * data have been returned, since we need to check the returned 114 * ip header length. 115 */ 116 #define ICMP_MINLEN 8 /* abs minimum */ 117 #define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */ 118 #define ICMP_MASKLEN 12 /* address mask */ 119 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 120 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 121 /* N.B.: must separately check that ip_hl >= 5 */ 122 123 /* 124 * Definition of type and code field values. 125 */ 126 #define ICMP_ECHOREPLY 0 /* echo reply */ 127 #define ICMP_UNREACH 3 /* dest unreachable, codes: */ 128 #define ICMP_UNREACH_NET 0 /* bad net */ 129 #define ICMP_UNREACH_HOST 1 /* bad host */ 130 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 131 #define ICMP_UNREACH_PORT 3 /* bad port */ 132 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 133 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 134 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 135 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 136 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 137 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ 138 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 139 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 140 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 141 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 142 #define ICMP_REDIRECT 5 /* shorter route, codes: */ 143 #define ICMP_REDIRECT_NET 0 /* for network */ 144 #define ICMP_REDIRECT_HOST 1 /* for host */ 145 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 146 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 147 #define ICMP_ECHO 8 /* echo service */ 148 #define ICMP_ROUTERADVERT 9 /* router advertisement */ 149 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 150 #define ICMP_TIMXCEED 11 /* time exceeded, code: */ 151 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 152 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 153 #define ICMP_PARAMPROB 12 /* ip header bad */ 154 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 155 #define ICMP_TSTAMP 13 /* timestamp request */ 156 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 157 #define ICMP_IREQ 15 /* information request */ 158 #define ICMP_IREQREPLY 16 /* information reply */ 159 #define ICMP_MASKREQ 17 /* address mask request */ 160 #define ICMP_MASKREPLY 18 /* address mask reply */ 161 162 #define ICMP_MAXTYPE 18 163 164 #define ICMP_INFOTYPE(type) \ 165 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 166 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 167 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 168 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 169 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 170 171 #ifdef _KERNEL 172 void icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *)); 173 void icmp_input __P((struct mbuf *, ...)); 174 void icmp_reflect __P((struct mbuf *)); 175 void icmp_send __P((struct mbuf *, struct mbuf *)); 176 int icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 177 #endif 178 179