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