1 /* $NetBSD: ip_icmp.h,v 1.16 2001/10/30 06:41:11 kml 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 #ifndef _NETINET_IP_ICMP_H_ 39 #define _NETINET_IP_ICMP_H_ 40 41 42 /* 43 * Interface Control Message Protocol Definitions. 44 * Per RFC 792, September 1981. 45 */ 46 47 /* 48 * Internal of an ICMP Router Advertisement 49 */ 50 struct icmp_ra_addr { 51 u_int32_t ira_addr; 52 u_int32_t ira_preference; 53 } __attribute__((__packed__)); 54 55 /* 56 * Structure of an icmp header. 57 */ 58 struct icmp { 59 u_int8_t icmp_type; /* type of message, see below */ 60 u_int8_t icmp_code; /* type sub code */ 61 u_int16_t icmp_cksum; /* ones complement cksum of struct */ 62 union { 63 u_int8_t ih_pptr; /* ICMP_PARAMPROB */ 64 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 65 struct ih_idseq { 66 n_short icd_id; 67 n_short icd_seq; 68 } ih_idseq __attribute__((__packed__)); 69 int32_t ih_void; 70 71 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 72 struct ih_pmtu { 73 n_short ipm_void; 74 n_short ipm_nextmtu; 75 } ih_pmtu __attribute__((__packed__)); 76 struct ih_rtradv { 77 u_int8_t irt_num_addrs; 78 u_int8_t irt_wpa; 79 u_int16_t irt_lifetime; 80 } ih_rtradv __attribute__((__packed__)); 81 } icmp_hun /* XXX __attribute__((__packed__)) ??? */; 82 #define icmp_pptr icmp_hun.ih_pptr 83 #define icmp_gwaddr icmp_hun.ih_gwaddr 84 #define icmp_id icmp_hun.ih_idseq.icd_id 85 #define icmp_seq icmp_hun.ih_idseq.icd_seq 86 #define icmp_void icmp_hun.ih_void 87 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 88 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 89 #define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs 90 #define icmp_wpa icmp_hun.ih_rtradv.irt_wpa 91 #define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime 92 union { 93 struct id_ts { 94 n_time its_otime; 95 n_time its_rtime; 96 n_time its_ttime; 97 } id_ts __attribute__((__packed__)); 98 struct id_ip { 99 struct ip idi_ip; 100 /* options and then 64 bits of data */ 101 } id_ip __attribute__((__packed__)); 102 struct icmp_ra_addr id_radv; 103 u_int32_t id_mask; 104 int8_t id_data[1]; 105 } icmp_dun /* XXX __attribute__((__packed__)) ??? */; 106 #define icmp_otime icmp_dun.id_ts.its_otime 107 #define icmp_rtime icmp_dun.id_ts.its_rtime 108 #define icmp_ttime icmp_dun.id_ts.its_ttime 109 #define icmp_ip icmp_dun.id_ip.idi_ip 110 #define icmp_radv icmp_dun.id_mask 111 #define icmp_mask icmp_dun.id_mask 112 #define icmp_data icmp_dun.id_data 113 }; 114 115 /* 116 * Lower bounds on packet lengths for various types. 117 * For the error advice packets must first insure that the 118 * packet is large enought to contain the returned ip header. 119 * Only then can we do the check to see if 64 bits of packet 120 * data have been returned, since we need to check the returned 121 * ip header length. 122 */ 123 #define ICMP_MINLEN 8 /* abs minimum */ 124 #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */ 125 #define ICMP_MASKLEN 12 /* address mask */ 126 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 127 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 128 /* N.B.: must separately check that ip_hl >= 5 */ 129 130 /* 131 * Definition of type and code field values. 132 */ 133 #define ICMP_ECHOREPLY 0 /* echo reply */ 134 #define ICMP_UNREACH 3 /* dest unreachable, codes: */ 135 #define ICMP_UNREACH_NET 0 /* bad net */ 136 #define ICMP_UNREACH_HOST 1 /* bad host */ 137 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 138 #define ICMP_UNREACH_PORT 3 /* bad port */ 139 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 140 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 141 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 142 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 143 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 144 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ 145 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 146 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 147 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 148 #define ICMP_UNREACH_ADMIN_PROHIBIT 13 /* communication 149 administratively 150 prohibited */ 151 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 152 #define ICMP_REDIRECT 5 /* shorter route, codes: */ 153 #define ICMP_REDIRECT_NET 0 /* for network */ 154 #define ICMP_REDIRECT_HOST 1 /* for host */ 155 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 156 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 157 #define ICMP_ECHO 8 /* echo service */ 158 #define ICMP_ROUTERADVERT 9 /* router advertisement */ 159 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 160 #define ICMP_TIMXCEED 11 /* time exceeded, code: */ 161 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 162 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 163 #define ICMP_PARAMPROB 12 /* ip header bad */ 164 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 165 #define ICMP_TSTAMP 13 /* timestamp request */ 166 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 167 #define ICMP_IREQ 15 /* information request */ 168 #define ICMP_IREQREPLY 16 /* information reply */ 169 #define ICMP_MASKREQ 17 /* address mask request */ 170 #define ICMP_MASKREPLY 18 /* address mask reply */ 171 172 #define ICMP_MAXTYPE 18 173 174 #define ICMP_INFOTYPE(type) \ 175 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 176 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 177 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 178 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 179 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 180 181 #ifdef _KERNEL 182 void icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *)); 183 void icmp_mtudisc __P((struct icmp *, struct in_addr)); 184 void icmp_input __P((struct mbuf *, ...)); 185 void icmp_init __P((void)); 186 void icmp_reflect __P((struct mbuf *)); 187 void icmp_send __P((struct mbuf *, struct mbuf *)); 188 int icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 189 190 void icmp_mtudisc_callback_register __P((void (*)(struct in_addr))); 191 #endif 192 193 194 #endif /* _NETINET_IP_ICMP_H_ */ 195