1 /* $NetBSD: ip_icmp.h,v 1.2 2018/04/07 22:37:30 christos Exp $ */ 2 3 /* NetBSD: ip_icmp.h,v 1.11 1996/08/03 15:48:18 neil Exp */ 4 5 /* 6 * Copyright (c) 1982, 1986, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93 34 */ 35 36 37 /* 38 * Interface Control Message Protocol Definitions. 39 * Per RFC 792, September 1981. 40 */ 41 42 /* 43 * Internal of an ICMP Router Advertisement 44 */ 45 struct icmp_ra_addr { 46 u_int32_t ira_addr; 47 u_int32_t ira_preference; 48 }; 49 50 /* 51 * Structure of an icmp header. 52 */ 53 struct icmp { 54 u_int8_t icmp_type; /* type of message, see below */ 55 u_int8_t icmp_code; /* type sub code */ 56 u_int16_t icmp_cksum; /* ones complement cksum of struct */ 57 union { 58 u_int8_t ih_pptr; /* ICMP_PARAMPROB */ 59 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 60 struct ih_idseq { 61 int16_t icd_id; 62 int16_t icd_seq; 63 } ih_idseq; 64 int32_t ih_void; 65 66 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 67 struct ih_pmtu { 68 int16_t ipm_void; 69 int16_t ipm_nextmtu; 70 } ih_pmtu; 71 struct ih_rtradv { 72 u_int8_t irt_num_addrs; 73 u_int8_t irt_wpa; 74 u_int16_t irt_lifetime; 75 } ih_rtradv; 76 } icmp_hun; 77 #define icmp_pptr icmp_hun.ih_pptr 78 #define icmp_gwaddr icmp_hun.ih_gwaddr 79 #define icmp_id icmp_hun.ih_idseq.icd_id 80 #define icmp_seq icmp_hun.ih_idseq.icd_seq 81 #define icmp_void icmp_hun.ih_void 82 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 83 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 84 #define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs 85 #define icmp_wpa icmp_hun.ih_rtradv.irt_wpa 86 #define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime 87 union { 88 struct id_ts { 89 u_int32_t its_otime; 90 u_int32_t its_rtime; 91 u_int32_t its_ttime; 92 } id_ts; 93 struct id_ip { 94 struct ip idi_ip; 95 /* options and then 64 bits of data */ 96 } id_ip; 97 struct icmp_ra_addr id_radv; 98 u_int32_t id_mask; 99 int8_t id_data[1]; 100 } icmp_dun; 101 #define icmp_otime icmp_dun.id_ts.its_otime 102 #define icmp_rtime icmp_dun.id_ts.its_rtime 103 #define icmp_ttime icmp_dun.id_ts.its_ttime 104 #define icmp_ip icmp_dun.id_ip.idi_ip 105 #define icmp_radv icmp_dun.id_mask 106 #define icmp_mask icmp_dun.id_mask 107 #define icmp_data icmp_dun.id_data 108 }; 109 110 /* 111 * Lower bounds on packet lengths for various types. 112 * For the error advice packets must first insure that the 113 * packet is large enought to contain the returned ip header. 114 * Only then can we do the check to see if 64 bits of packet 115 * data have been returned, since we need to check the returned 116 * ip header length. 117 */ 118 #define ICMP_MINLEN 8 /* abs minimum */ 119 #define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */ 120 #define ICMP_MASKLEN 12 /* address mask */ 121 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 122 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 123 /* N.B.: must separately check that ip_hl >= 5 */ 124 125 /* 126 * Definition of type and code field values. 127 */ 128 #define ICMP_ECHOREPLY 0 /* echo reply */ 129 #define ICMP_UNREACH 3 /* dest unreachable, codes: */ 130 #define ICMP_UNREACH_NET 0 /* bad net */ 131 #define ICMP_UNREACH_HOST 1 /* bad host */ 132 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 133 #define ICMP_UNREACH_PORT 3 /* bad port */ 134 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 135 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 136 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 137 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 138 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 139 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ 140 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 141 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 142 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 143 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 144 #define ICMP_REDIRECT 5 /* shorter route, codes: */ 145 #define ICMP_REDIRECT_NET 0 /* for network */ 146 #define ICMP_REDIRECT_HOST 1 /* for host */ 147 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 148 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 149 #define ICMP_ECHO 8 /* echo service */ 150 #define ICMP_ROUTERADVERT 9 /* router advertisement */ 151 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 152 #define ICMP_TIMXCEED 11 /* time exceeded, code: */ 153 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 154 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 155 #define ICMP_PARAMPROB 12 /* ip header bad */ 156 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 157 #define ICMP_TSTAMP 13 /* timestamp request */ 158 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 159 #define ICMP_IREQ 15 /* information request */ 160 #define ICMP_IREQREPLY 16 /* information reply */ 161 #define ICMP_MASKREQ 17 /* address mask request */ 162 #define ICMP_MASKREPLY 18 /* address mask reply */ 163 164 #define ICMP_MAXTYPE 18 165 166 #define ICMP_INFOTYPE(type) \ 167 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 168 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 169 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 170 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 171 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 172 173 #ifdef _KERNEL 174 void icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *)); 175 void icmp_input __P((struct mbuf *, ...)); 176 void icmp_reflect __P((struct mbuf *)); 177 void icmp_send __P((struct mbuf *, struct mbuf *)); 178 int icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 179 #endif 180 181