ip_icmp.h revision 1.11
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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93 36 */ 37 38 39/* 40 * Interface Control Message Protocol Definitions. 41 * Per RFC 792, September 1981. 42 */ 43 44/* 45 * Internal of an ICMP Router Advertisement 46 */ 47struct icmp_ra_addr { 48 u_int32_t ira_addr; 49 u_int32_t ira_preference; 50}; 51 52/* 53 * Structure of an icmp header. 54 */ 55struct icmp { 56 u_int8_t icmp_type; /* type of message, see below */ 57 u_int8_t icmp_code; /* type sub code */ 58 u_int16_t icmp_cksum; /* ones complement cksum of struct */ 59 union { 60 u_int8_t ih_pptr; /* ICMP_PARAMPROB */ 61 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 62 struct ih_idseq { 63 n_short icd_id; 64 n_short icd_seq; 65 } ih_idseq; 66 int32_t ih_void; 67 68 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 69 struct ih_pmtu { 70 n_short ipm_void; 71 n_short ipm_nextmtu; 72 } ih_pmtu; 73 struct ih_rtradv { 74 u_int8_t irt_num_addrs; 75 u_int8_t irt_wpa; 76 u_int16_t irt_lifetime; 77 } ih_rtradv; 78 } icmp_hun; 79#define icmp_pptr icmp_hun.ih_pptr 80#define icmp_gwaddr icmp_hun.ih_gwaddr 81#define icmp_id icmp_hun.ih_idseq.icd_id 82#define icmp_seq icmp_hun.ih_idseq.icd_seq 83#define icmp_void icmp_hun.ih_void 84#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 85#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 86#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs 87#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa 88#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime 89 union { 90 struct id_ts { 91 n_time its_otime; 92 n_time its_rtime; 93 n_time its_ttime; 94 } id_ts; 95 struct id_ip { 96 struct ip idi_ip; 97 /* options and then 64 bits of data */ 98 } id_ip; 99 struct icmp_ra_addr id_radv; 100 u_int32_t id_mask; 101 int8_t id_data[1]; 102 } icmp_dun; 103#define icmp_otime icmp_dun.id_ts.its_otime 104#define icmp_rtime icmp_dun.id_ts.its_rtime 105#define icmp_ttime icmp_dun.id_ts.its_ttime 106#define icmp_ip icmp_dun.id_ip.idi_ip 107#define icmp_radv icmp_dun.id_mask 108#define icmp_mask icmp_dun.id_mask 109#define icmp_data icmp_dun.id_data 110}; 111 112/* 113 * Lower bounds on packet lengths for various types. 114 * For the error advice packets must first insure that the 115 * packet is large enought to contain the returned ip header. 116 * Only then can we do the check to see if 64 bits of packet 117 * data have been returned, since we need to check the returned 118 * ip header length. 119 */ 120#define ICMP_MINLEN 8 /* abs minimum */ 121#define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */ 122#define ICMP_MASKLEN 12 /* address mask */ 123#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 124#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 125 /* N.B.: must separately check that ip_hl >= 5 */ 126 127/* 128 * Definition of type and code field values. 129 */ 130#define ICMP_ECHOREPLY 0 /* echo reply */ 131#define ICMP_UNREACH 3 /* dest unreachable, codes: */ 132#define ICMP_UNREACH_NET 0 /* bad net */ 133#define ICMP_UNREACH_HOST 1 /* bad host */ 134#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 135#define ICMP_UNREACH_PORT 3 /* bad port */ 136#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 137#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 138#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 139#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 140#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 141#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ 142#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 143#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 144#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 145#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 146#define ICMP_REDIRECT 5 /* shorter route, codes: */ 147#define ICMP_REDIRECT_NET 0 /* for network */ 148#define ICMP_REDIRECT_HOST 1 /* for host */ 149#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 150#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 151#define ICMP_ECHO 8 /* echo service */ 152#define ICMP_ROUTERADVERT 9 /* router advertisement */ 153#define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 154#define ICMP_TIMXCEED 11 /* time exceeded, code: */ 155#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 156#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 157#define ICMP_PARAMPROB 12 /* ip header bad */ 158#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 159#define ICMP_TSTAMP 13 /* timestamp request */ 160#define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 161#define ICMP_IREQ 15 /* information request */ 162#define ICMP_IREQREPLY 16 /* information reply */ 163#define ICMP_MASKREQ 17 /* address mask request */ 164#define ICMP_MASKREPLY 18 /* address mask reply */ 165 166#define ICMP_MAXTYPE 18 167 168#define ICMP_INFOTYPE(type) \ 169 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 170 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 171 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 172 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 173 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 174 175#ifdef _KERNEL 176void icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *)); 177void icmp_input __P((struct mbuf *, ...)); 178void icmp_reflect __P((struct mbuf *)); 179void icmp_send __P((struct mbuf *, struct mbuf *)); 180int icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 181#endif 182 183