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