1/* $OpenBSD: ip_icmp.h,v 1.32 2020/12/20 21:15:47 bluhm Exp $ */ 2/* $NetBSD: ip_icmp.h,v 1.10 1996/02/13 23:42:28 christos Exp $ */ 3 4/* 5 * Copyright (c) 1982, 1986, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93 33 */ 34 35#ifndef _NETINET_IP_ICMP_H_ 36#define _NETINET_IP_ICMP_H_ 37 38/* 39 * Interface Control Message Protocol Definitions. 40 * Per RFC 792, September 1981. 41 * RFC 950, August 1985. (Address Mask Request / Reply) 42 * RFC 1256, September 1991. (Router Advertisement and Solicitation) 43 * RFC 1108, November 1991. (Param Problem, Missing Req. Option) 44 * RFC 1393, January 1993. (Traceroute) 45 * RFC 1475, June 1993. (Datagram Conversion Error) 46 * RFC 1812, June 1995. (adm prohib, host precedence, precedence cutoff) 47 * RFC 2002, October 1996. (Mobility changes to Router Advertisement) 48 */ 49 50/* 51 * ICMP Router Advertisement data 52 */ 53struct icmp_ra_addr { 54 u_int32_t ira_addr; 55 u_int32_t ira_preference; 56}; 57 58/* 59 * Structure of an icmp header. 60 */ 61struct icmp { 62 u_int8_t icmp_type; /* type of message, see below */ 63 u_int8_t icmp_code; /* type sub code */ 64 u_int16_t icmp_cksum; /* ones complement cksum of struct */ 65 union { 66 u_int8_t ih_pptr; /* ICMP_PARAMPROB */ 67 struct ih_exthdr { /* RFC4884 extended header */ 68 u_int8_t iex_pad; 69 u_int8_t iex_length; 70 } ih_exthdr; 71 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 72 struct ih_idseq { 73 u_int16_t icd_id; 74 u_int16_t icd_seq; 75 } ih_idseq; 76 int32_t ih_void; 77 78 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 79 struct ih_pmtu { 80 u_int16_t ipm_void; 81 u_int16_t ipm_nextmtu; 82 } ih_pmtu; 83 84 struct ih_rtradv { 85 u_int8_t irt_num_addrs; 86 u_int8_t irt_wpa; 87 u_int16_t irt_lifetime; 88 } ih_rtradv; 89 } icmp_hun; 90#define icmp_pptr icmp_hun.ih_pptr 91#define icmp_length icmp_hun.ih_exthdr.iex_length 92#define icmp_gwaddr icmp_hun.ih_gwaddr 93#define icmp_id icmp_hun.ih_idseq.icd_id 94#define icmp_seq icmp_hun.ih_idseq.icd_seq 95#define icmp_void icmp_hun.ih_void 96#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 97#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 98#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs 99#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa 100#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime 101 union { 102 struct id_ts { 103 u_int32_t its_otime; 104 u_int32_t its_rtime; 105 u_int32_t its_ttime; 106 } id_ts; 107 struct id_ip { 108 struct ip idi_ip; 109 /* options and then 64 bits of data */ 110 } id_ip; 111 u_int32_t id_mask; 112 int8_t id_data[1]; 113 } icmp_dun; 114#define icmp_otime icmp_dun.id_ts.its_otime 115#define icmp_rtime icmp_dun.id_ts.its_rtime 116#define icmp_ttime icmp_dun.id_ts.its_ttime 117#define icmp_ip icmp_dun.id_ip.idi_ip 118#define icmp_mask icmp_dun.id_mask 119#define icmp_data icmp_dun.id_data 120}; 121 122struct icmp_ext_hdr { 123 u_int8_t ieh_version; /* only high nibble used */ 124 u_int8_t ieh_res; /* reserved, must be zero */ 125 u_int16_t ieh_cksum; /* ones complement cksum of ext hdr */ 126}; 127 128#define ICMP_EXT_HDR_VERSION 0x20 129#define ICMP_EXT_HDR_VMASK 0xf0 130#define ICMP_EXT_OFFSET 128 131 132struct icmp_ext_obj_hdr { 133 u_int16_t ieo_length; /* length of obj incl this header */ 134 u_int8_t ieo_cnum; /* class number */ 135 u_int8_t ieo_ctype; /* sub class type */ 136}; 137 138#define ICMP_EXT_MPLS 1 139#define ICMP_EXT_IFINFO 2 140 141/* 142 * For IPv6 transition related ICMP errors. 143 */ 144#define ICMP_V6ADVLENMIN (8 + sizeof(struct ip) + 40) 145#define ICMP_V6ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 40) 146 147/* 148 * Lower bounds on packet lengths for various types. 149 * For the error advice packets must first insure that the 150 * packet is large enough to contain the returned ip header. 151 * Only then can we do the check to see if 64 bits of packet 152 * data have been returned, since we need to check the returned 153 * ip header length. 154 */ 155#define ICMP_MINLEN 8 /* abs minimum */ 156#define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */ 157#define ICMP_MASKLEN 12 /* address mask */ 158#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 159#define ICMP_ADVLENMAX (8 + 60 + 40) /* maximum */ 160#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 161 /* N.B.: must separately check that ip_hl >= 5 */ 162 163/* 164 * Definition of type and code field values. 165 * https://www.iana.org/assignments/icmp-parameters 166 */ 167#define ICMP_ECHOREPLY 0 /* echo reply */ 168#define ICMP_UNREACH 3 /* dest unreachable, codes: */ 169#define ICMP_UNREACH_NET 0 /* bad net */ 170#define ICMP_UNREACH_HOST 1 /* bad host */ 171#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 172#define ICMP_UNREACH_PORT 3 /* bad port */ 173#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 174#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 175#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 176#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 177#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 178#define ICMP_UNREACH_NET_PROHIB 9 /* for crypto devs */ 179#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 180#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 181#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 182#define ICMP_UNREACH_FILTER_PROHIB 13 /* prohibited access */ 183#define ICMP_UNREACH_HOST_PRECEDENCE 14 /* precedence violat'n*/ 184#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */ 185#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 186#define ICMP_REDIRECT 5 /* shorter route, codes: */ 187#define ICMP_REDIRECT_NET 0 /* for network */ 188#define ICMP_REDIRECT_HOST 1 /* for host */ 189#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 190#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 191#define ICMP_ALTHOSTADDR 6 /* alternate host address */ 192#define ICMP_ECHO 8 /* echo service */ 193#define ICMP_ROUTERADVERT 9 /* router advertisement */ 194#define ICMP_ROUTERADVERT_NORMAL 0 /* normal advertisement */ 195#define ICMP_ROUTERADVERT_NOROUTE_COMMON 16 /* selective routing */ 196#define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 197#define ICMP_TIMXCEED 11 /* time exceeded, code: */ 198#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 199#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 200#define ICMP_PARAMPROB 12 /* ip header bad */ 201#define ICMP_PARAMPROB_ERRATPTR 0 /* req. opt. absent */ 202#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 203#define ICMP_PARAMPROB_LENGTH 2 /* bad length */ 204#define ICMP_TSTAMP 13 /* timestamp request */ 205#define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 206#define ICMP_IREQ 15 /* information request */ 207#define ICMP_IREQREPLY 16 /* information reply */ 208#define ICMP_MASKREQ 17 /* address mask request */ 209#define ICMP_MASKREPLY 18 /* address mask reply */ 210#define ICMP_TRACEROUTE 30 /* traceroute */ 211#define ICMP_DATACONVERR 31 /* data conversion error */ 212#define ICMP_MOBILE_REDIRECT 32 /* mobile host redirect */ 213#define ICMP_IPV6_WHEREAREYOU 33 /* IPv6 where-are-you */ 214#define ICMP_IPV6_IAMHERE 34 /* IPv6 i-am-here */ 215#define ICMP_MOBILE_REGREQUEST 35 /* mobile registration req */ 216#define ICMP_MOBILE_REGREPLY 36 /* mobile registration reply */ 217#define ICMP_SKIP 39 /* SKIP */ 218#define ICMP_PHOTURIS 40 /* Photuris */ 219#define ICMP_PHOTURIS_UNKNOWN_INDEX 1 /* unknown sec index */ 220#define ICMP_PHOTURIS_AUTH_FAILED 2 /* auth failed */ 221#define ICMP_PHOTURIS_DECRYPT_FAILED 3 /* decrypt failed */ 222 223#define ICMP_MAXTYPE 40 224 225#define ICMP_INFOTYPE(type) \ 226 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 227 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 228 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 229 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 230 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 231 232#ifdef _KERNEL 233struct mbuf * 234 icmp_do_error(struct mbuf *, int, int, u_int32_t, int); 235void icmp_error(struct mbuf *, int, int, u_int32_t, int); 236int icmp_input(struct mbuf **, int *, int, int); 237void icmp_init(void); 238int icmp_reflect(struct mbuf *, struct mbuf **, struct in_ifaddr *); 239void icmp_send(struct mbuf *, struct mbuf *); 240int icmp_sysctl(int *, u_int, void *, size_t *, void *, size_t); 241struct rtentry * 242 icmp_mtudisc_clone(struct in_addr, u_int, int); 243void icmp_mtudisc(struct icmp *, u_int); 244int icmp_do_exthdr(struct mbuf *, u_int16_t, u_int8_t, void *, size_t); 245#endif /* _KERNEL */ 246#endif /* _NETINET_IP_ICMP_H_ */ 247