1 /*- 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93 30 * $FreeBSD$ 31 */ 32 33 #ifndef _NETINET_IP_ICMP_H_ 34 #define _NETINET_IP_ICMP_H_ 35 36 /* 37 * Interface Control Message Protocol Definitions. 38 * Per RFC 792, September 1981. 39 */ 40 41 /* 42 * Internal of an ICMP Router Advertisement 43 */ 44 struct icmp_ra_addr { 45 u_int32_t ira_addr; 46 u_int32_t ira_preference; 47 }; 48 49 /* 50 * Structure of an icmp header. 51 */ 52 struct icmphdr { 53 u_char icmp_type; /* type of message, see below */ 54 u_char icmp_code; /* type sub code */ 55 u_short icmp_cksum; /* ones complement cksum of struct */ 56 }; 57 58 /* 59 * Structure of an icmp packet. 60 * 61 * XXX: should start with a struct icmphdr. 62 */ 63 struct icmp { 64 u_char icmp_type; /* type of message, see below */ 65 u_char icmp_code; /* type sub code */ 66 u_short icmp_cksum; /* ones complement cksum of struct */ 67 union { 68 u_char ih_pptr; /* ICMP_PARAMPROB */ 69 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 70 struct ih_idseq { 71 uint16_t icd_id; /* network format */ 72 uint16_t icd_seq; /* network format */ 73 } ih_idseq; 74 int ih_void; 75 76 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 77 struct ih_pmtu { 78 uint16_t ipm_void; /* network format */ 79 uint16_t ipm_nextmtu; /* network format */ 80 } ih_pmtu; 81 82 struct ih_rtradv { 83 u_char irt_num_addrs; 84 u_char irt_wpa; 85 u_int16_t irt_lifetime; 86 } ih_rtradv; 87 } icmp_hun; 88 #define icmp_pptr icmp_hun.ih_pptr 89 #define icmp_gwaddr icmp_hun.ih_gwaddr 90 #define icmp_id icmp_hun.ih_idseq.icd_id 91 #define icmp_seq icmp_hun.ih_idseq.icd_seq 92 #define icmp_void icmp_hun.ih_void 93 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 94 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 95 #define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs 96 #define icmp_wpa icmp_hun.ih_rtradv.irt_wpa 97 #define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime 98 union { 99 struct id_ts { /* ICMP Timestamp */ 100 /* 101 * The next 3 fields are in network format, 102 * milliseconds since 00:00 UTC 103 */ 104 uint32_t its_otime; /* Originate */ 105 uint32_t its_rtime; /* Receive */ 106 uint32_t its_ttime; /* Transmit */ 107 } id_ts; 108 struct id_ip { 109 struct ip idi_ip; 110 /* options and then 64 bits of data */ 111 } id_ip; 112 struct icmp_ra_addr id_radv; 113 u_int32_t id_mask; 114 char id_data[1]; 115 } icmp_dun; 116 #define icmp_otime icmp_dun.id_ts.its_otime 117 #define icmp_rtime icmp_dun.id_ts.its_rtime 118 #define icmp_ttime icmp_dun.id_ts.its_ttime 119 #define icmp_ip icmp_dun.id_ip.idi_ip 120 #define icmp_radv icmp_dun.id_radv 121 #define icmp_mask icmp_dun.id_mask 122 #define icmp_data icmp_dun.id_data 123 }; 124 125 /* 126 * Lower bounds on packet lengths for various types. 127 * For the error advice packets must first insure that the 128 * packet is large enough to contain the returned ip header. 129 * Only then can we do the check to see if 64 bits of packet 130 * data have been returned, since we need to check the returned 131 * ip header length. 132 */ 133 #define ICMP_MINLEN 8 /* abs minimum */ 134 #define ICMP_TSLEN (8 + 3 * sizeof (uint32_t)) /* timestamp */ 135 #define ICMP_MASKLEN 12 /* address mask */ 136 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 137 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 138 /* N.B.: must separately check that ip_hl >= 5 */ 139 /* This is the minimum length required by RFC 792. */ 140 /* 141 * ICMP_ADVLENPREF is the preferred number of bytes which should be contiguous. 142 * SCTP needs additional 12 bytes to be able to access the initiate tag 143 * in packets containing an INIT chunk. For also supporting SCTP/UDP, 144 * additional 8 bytes are needed. 145 */ 146 #define ICMP_ADVLENPREF(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8 + 8 + 12) 147 148 /* 149 * Definition of type and code field values. 150 */ 151 #define ICMP_ECHOREPLY 0 /* echo reply */ 152 #define ICMP_UNREACH 3 /* dest unreachable, codes: */ 153 #define ICMP_UNREACH_NET 0 /* bad net */ 154 #define ICMP_UNREACH_HOST 1 /* bad host */ 155 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 156 #define ICMP_UNREACH_PORT 3 /* bad port */ 157 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 158 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 159 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 160 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 161 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 162 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ 163 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 164 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 165 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 166 #define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohib */ 167 #define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host prec vio. */ 168 #define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* prec cutoff */ 169 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 170 #define ICMP_REDIRECT 5 /* shorter route, codes: */ 171 #define ICMP_REDIRECT_NET 0 /* for network */ 172 #define ICMP_REDIRECT_HOST 1 /* for host */ 173 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 174 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 175 #define ICMP_ALTHOSTADDR 6 /* alternate host address */ 176 #define ICMP_ECHO 8 /* echo service */ 177 #define ICMP_ROUTERADVERT 9 /* router advertisement */ 178 #define ICMP_ROUTERADVERT_NORMAL 0 /* normal advertisement */ 179 #define ICMP_ROUTERADVERT_NOROUTE_COMMON 16 /* selective routing */ 180 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 181 #define ICMP_TIMXCEED 11 /* time exceeded, code: */ 182 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 183 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 184 #define ICMP_PARAMPROB 12 /* ip header bad */ 185 #define ICMP_PARAMPROB_ERRATPTR 0 /* error at param ptr */ 186 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 187 #define ICMP_PARAMPROB_LENGTH 2 /* bad length */ 188 #define ICMP_TSTAMP 13 /* timestamp request */ 189 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 190 #define ICMP_IREQ 15 /* information request */ 191 #define ICMP_IREQREPLY 16 /* information reply */ 192 #define ICMP_MASKREQ 17 /* address mask request */ 193 #define ICMP_MASKREPLY 18 /* address mask reply */ 194 #define ICMP_TRACEROUTE 30 /* traceroute */ 195 #define ICMP_DATACONVERR 31 /* data conversion error */ 196 #define ICMP_MOBILE_REDIRECT 32 /* mobile host redirect */ 197 #define ICMP_IPV6_WHEREAREYOU 33 /* IPv6 where-are-you */ 198 #define ICMP_IPV6_IAMHERE 34 /* IPv6 i-am-here */ 199 #define ICMP_MOBILE_REGREQUEST 35 /* mobile registration req */ 200 #define ICMP_MOBILE_REGREPLY 36 /* mobile registration reply */ 201 #define ICMP_SKIP 39 /* SKIP */ 202 #define ICMP_PHOTURIS 40 /* Photuris */ 203 #define ICMP_PHOTURIS_UNKNOWN_INDEX 1 /* unknown sec index */ 204 #define ICMP_PHOTURIS_AUTH_FAILED 2 /* auth failed */ 205 #define ICMP_PHOTURIS_DECRYPT_FAILED 3 /* decrypt failed */ 206 207 #define ICMP_MAXTYPE 40 208 209 #define ICMP_INFOTYPE(type) \ 210 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 211 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 212 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 213 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 214 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 215 216 #ifdef _KERNEL 217 void icmp_error(struct mbuf *, int, int, uint32_t, int); 218 int icmp_input(struct mbuf **, int *, int); 219 int ip_next_mtu(int, int); 220 #endif 221 222 #endif 223