1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 32#ifndef _NETINET_IP_ICMP_H_ 33#define _NETINET_IP_ICMP_H_ 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 */ 43struct 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 */ 51struct icmphdr { 52 u_char icmp_type; /* type of message, see below */ 53 u_char icmp_code; /* type sub code */ 54 u_short icmp_cksum; /* ones complement cksum of struct */ 55}; 56 57/* 58 * Structure of an icmp packet. 59 * 60 * XXX: should start with a struct icmphdr. 61 */ 62struct icmp { 63 u_char icmp_type; /* type of message, see below */ 64 u_char icmp_code; /* type sub code */ 65 u_short icmp_cksum; /* ones complement cksum of struct */ 66 union { 67 u_char ih_pptr; /* ICMP_PARAMPROB */ 68 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 69 struct ih_idseq { 70 uint16_t icd_id; /* network format */ 71 uint16_t icd_seq; /* network format */ 72 } ih_idseq; 73 int ih_void; 74 75 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 76 struct ih_pmtu { 77 uint16_t ipm_void; /* network format */ 78 uint16_t ipm_nextmtu; /* network format */ 79 } ih_pmtu; 80 81 struct ih_rtradv { 82 u_char irt_num_addrs; 83 u_char irt_wpa; 84 u_int16_t irt_lifetime; 85 } ih_rtradv; 86 } icmp_hun; 87#define icmp_pptr icmp_hun.ih_pptr 88#define icmp_gwaddr icmp_hun.ih_gwaddr 89#define icmp_id icmp_hun.ih_idseq.icd_id 90#define icmp_seq icmp_hun.ih_idseq.icd_seq 91#define icmp_void icmp_hun.ih_void 92#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 93#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 94#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs 95#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa 96#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime 97 union { 98 struct id_ts { /* ICMP Timestamp */ 99 /* 100 * The next 3 fields are in network format, 101 * milliseconds since 00:00 UTC 102 */ 103 uint32_t its_otime; /* Originate */ 104 uint32_t its_rtime; /* Receive */ 105 uint32_t its_ttime; /* Transmit */ 106 } id_ts; 107 struct id_ip { 108 struct ip idi_ip; 109 /* options and then 64 bits of data */ 110 } id_ip; 111 struct icmp_ra_addr id_radv; 112 u_int32_t id_mask; 113 char id_data[1]; 114 } icmp_dun; 115#define icmp_otime icmp_dun.id_ts.its_otime 116#define icmp_rtime icmp_dun.id_ts.its_rtime 117#define icmp_ttime icmp_dun.id_ts.its_ttime 118#define icmp_ip icmp_dun.id_ip.idi_ip 119#define icmp_radv icmp_dun.id_radv 120#define icmp_mask icmp_dun.id_mask 121#define icmp_data icmp_dun.id_data 122}; 123 124/* 125 * Lower bounds on packet lengths for various types. 126 * For the error advice packets must first insure that the 127 * packet is large enough to contain the returned ip header. 128 * Only then can we do the check to see if 64 bits of packet 129 * data have been returned, since we need to check the returned 130 * ip header length. 131 */ 132#define ICMP_MINLEN 8 /* abs minimum */ 133#define ICMP_TSLEN (8 + 3 * sizeof (uint32_t)) /* timestamp */ 134#define ICMP_MASKLEN 12 /* address mask */ 135#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 136#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 137 /* N.B.: must separately check that ip_hl >= 5 */ 138 /* This is the minimum length required by RFC 792. */ 139/* 140 * ICMP_ADVLENPREF is the preferred number of bytes which should be contiguous. 141 * SCTP needs additional 12 bytes to be able to access the initiate tag 142 * in packets containing an INIT chunk. For also supporting SCTP/UDP, 143 * additional 8 bytes are needed. 144 */ 145#define ICMP_ADVLENPREF(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8 + 8 + 12) 146 147/* 148 * Definition of type and code field values. 149 */ 150#define ICMP_ECHOREPLY 0 /* echo reply */ 151#define ICMP_UNREACH 3 /* dest unreachable, codes: */ 152#define ICMP_UNREACH_NET 0 /* bad net */ 153#define ICMP_UNREACH_HOST 1 /* bad host */ 154#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 155#define ICMP_UNREACH_PORT 3 /* bad port */ 156#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 157#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 158#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 159#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 160#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 161#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ 162#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 163#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 164#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 165#define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohib */ 166#define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host prec vio. */ 167#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* prec cutoff */ 168#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 169#define ICMP_REDIRECT 5 /* shorter route, codes: */ 170#define ICMP_REDIRECT_NET 0 /* for network */ 171#define ICMP_REDIRECT_HOST 1 /* for host */ 172#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 173#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 174#define ICMP_ALTHOSTADDR 6 /* alternate host address */ 175#define ICMP_ECHO 8 /* echo service */ 176#define ICMP_ROUTERADVERT 9 /* router advertisement */ 177#define ICMP_ROUTERADVERT_NORMAL 0 /* normal advertisement */ 178#define ICMP_ROUTERADVERT_NOROUTE_COMMON 16 /* selective routing */ 179#define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 180#define ICMP_TIMXCEED 11 /* time exceeded, code: */ 181#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 182#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 183#define ICMP_PARAMPROB 12 /* ip header bad */ 184#define ICMP_PARAMPROB_ERRATPTR 0 /* error at param ptr */ 185#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 186#define ICMP_PARAMPROB_LENGTH 2 /* bad length */ 187#define ICMP_TSTAMP 13 /* timestamp request */ 188#define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 189#define ICMP_IREQ 15 /* information request */ 190#define ICMP_IREQREPLY 16 /* information reply */ 191#define ICMP_MASKREQ 17 /* address mask request */ 192#define ICMP_MASKREPLY 18 /* address mask reply */ 193#define ICMP_TRACEROUTE 30 /* traceroute */ 194#define ICMP_DATACONVERR 31 /* data conversion error */ 195#define ICMP_MOBILE_REDIRECT 32 /* mobile host redirect */ 196#define ICMP_IPV6_WHEREAREYOU 33 /* IPv6 where-are-you */ 197#define ICMP_IPV6_IAMHERE 34 /* IPv6 i-am-here */ 198#define ICMP_MOBILE_REGREQUEST 35 /* mobile registration req */ 199#define ICMP_MOBILE_REGREPLY 36 /* mobile registration reply */ 200#define ICMP_SKIP 39 /* SKIP */ 201#define ICMP_PHOTURIS 40 /* Photuris */ 202#define ICMP_PHOTURIS_UNKNOWN_INDEX 1 /* unknown sec index */ 203#define ICMP_PHOTURIS_AUTH_FAILED 2 /* auth failed */ 204#define ICMP_PHOTURIS_DECRYPT_FAILED 3 /* decrypt failed */ 205 206#define ICMP_MAXTYPE 40 207 208#define ICMP_INFOTYPE(type) \ 209 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 210 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 211 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 212 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 213 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 214 215#ifdef _KERNEL 216int icmp_errmap(const struct icmp *); 217void icmp_error(struct mbuf *, int, int, uint32_t, int); 218int icmp_input(struct mbuf **, int *, int); 219int ip_next_mtu(int, int); 220#endif 221 222#endif 223