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 * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp 31 */ 32 33 #ifndef _NETINET_IP_ICMP_H_ 34 #define _NETINET_IP_ICMP_H_ 35 36 #include "helper.h" 37 38 /* 39 * Interface Control Message Protocol Definitions. 40 * Per RFC 792, September 1981. 41 */ 42 43 typedef u_int32_t n_time; 44 45 /* 46 * Structure of an icmp header. 47 */ 48 struct icmp { 49 u_char icmp_type; /* type of message, see below */ 50 u_char icmp_code; /* type sub code */ 51 u_short icmp_cksum; /* ones complement cksum of struct */ 52 union { 53 u_char ih_pptr; /* ICMP_PARAMPROB */ 54 ipaddr_t ih_gwaddr; /* ICMP_REDIRECT */ 55 struct ih_idseq { 56 u_short icd_id; 57 u_short icd_seq; 58 } ih_idseq; 59 int ih_void; 60 61 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 62 struct ih_pmtu { 63 u_short ipm_void; 64 u_short ipm_nextmtu; 65 } ih_pmtu; 66 } icmp_hun; 67 #define icmp_pptr icmp_hun.ih_pptr 68 #define icmp_gwaddr icmp_hun.ih_gwaddr 69 #define icmp_id icmp_hun.ih_idseq.icd_id 70 #define icmp_seq icmp_hun.ih_idseq.icd_seq 71 #define icmp_void icmp_hun.ih_void 72 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 73 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 74 union { 75 struct id_ts { 76 n_time its_otime; 77 n_time its_rtime; 78 n_time its_ttime; 79 } id_ts; 80 struct id_ip { 81 struct ip idi_ip; 82 /* options and then 64 bits of data */ 83 } id_ip; 84 uint32_t id_mask; 85 char id_data[1]; 86 } icmp_dun; 87 #define icmp_otime icmp_dun.id_ts.its_otime 88 #define icmp_rtime icmp_dun.id_ts.its_rtime 89 #define icmp_ttime icmp_dun.id_ts.its_ttime 90 #define icmp_ip icmp_dun.id_ip.idi_ip 91 #define icmp_mask icmp_dun.id_mask 92 #define icmp_data icmp_dun.id_data 93 }; 94 95 /* 96 * Lower bounds on packet lengths for various types. 97 * For the error advice packets must first insure that the 98 * packet is large enought to contain the returned ip header. 99 * Only then can we do the check to see if 64 bits of packet 100 * data have been returned, since we need to check the returned 101 * ip header length. 102 */ 103 #define ICMP_MINLEN 8 /* abs minimum */ 104 #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */ 105 #define ICMP_MASKLEN 12 /* address mask */ 106 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 107 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 108 /* N.B.: must separately check that ip_hl >= 5 */ 109 110 /* 111 * Definition of type and code field values. 112 */ 113 #define ICMP_ECHOREPLY 0 /* echo reply */ 114 #define ICMP_UNREACH 3 /* dest unreachable, codes: */ 115 #define ICMP_UNREACH_NET 0 /* bad net */ 116 #define ICMP_UNREACH_HOST 1 /* bad host */ 117 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 118 #define ICMP_UNREACH_PORT 3 /* bad port */ 119 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 120 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 121 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 122 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 123 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 124 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ 125 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 126 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 127 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 128 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 129 #define ICMP_REDIRECT 5 /* shorter route, codes: */ 130 #define ICMP_REDIRECT_NET 0 /* for network */ 131 #define ICMP_REDIRECT_HOST 1 /* for host */ 132 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 133 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 134 #define ICMP_ECHO 8 /* echo service */ 135 #define ICMP_ROUTERADVERT 9 /* router advertisement */ 136 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 137 #define ICMP_TIMXCEED 11 /* time exceeded, code: */ 138 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 139 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 140 #define ICMP_PARAMPROB 12 /* ip header bad */ 141 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 142 #define ICMP_TSTAMP 13 /* timestamp request */ 143 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 144 #define ICMP_IREQ 15 /* information request */ 145 #define ICMP_IREQREPLY 16 /* information reply */ 146 #define ICMP_MASKREQ 17 /* address mask request */ 147 #define ICMP_MASKREPLY 18 /* address mask reply */ 148 149 #define ICMP_MAXTYPE 18 150 151 #define ICMP_INFOTYPE(type) \ 152 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 153 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 154 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 155 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 156 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 157 158 void icmp_input _P((struct mbuf *, int)); 159 void icmp_error(struct mbuf *msrc, u_char type, u_char code, int minsize, 160 const char *message); 161 void icmp_reflect _P((struct mbuf *)); 162 163 #endif 164
