ip_icmp.h revision 55f4e4a5ec657a017e3bf75299ad71fd1c968dd3
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 * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp 35 */ 36 37#ifndef _NETINET_IP_ICMP_H_ 38#define _NETINET_IP_ICMP_H_ 39 40/* 41 * Interface Control Message Protocol Definitions. 42 * Per RFC 792, September 1981. 43 */ 44 45typedef u_int32_t n_time; 46 47/* 48 * Structure of an icmp header. 49 */ 50struct icmp { 51 u_char icmp_type; /* type of message, see below */ 52 u_char icmp_code; /* type sub code */ 53 u_short icmp_cksum; /* ones complement cksum of struct */ 54 union { 55 u_char ih_pptr; /* ICMP_PARAMPROB */ 56 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 57 struct ih_idseq { 58 u_short icd_id; 59 u_short icd_seq; 60 } ih_idseq; 61 int ih_void; 62 63 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 64 struct ih_pmtu { 65 u_short ipm_void; 66 u_short ipm_nextmtu; 67 } ih_pmtu; 68 } icmp_hun; 69#define icmp_pptr icmp_hun.ih_pptr 70#define icmp_gwaddr icmp_hun.ih_gwaddr 71#define icmp_id icmp_hun.ih_idseq.icd_id 72#define icmp_seq icmp_hun.ih_idseq.icd_seq 73#define icmp_void icmp_hun.ih_void 74#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 75#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 76 union { 77 struct id_ts { 78 n_time its_otime; 79 n_time its_rtime; 80 n_time its_ttime; 81 } id_ts; 82 struct id_ip { 83 struct ip idi_ip; 84 /* options and then 64 bits of data */ 85 } id_ip; 86 uint32_t id_mask; 87 char id_data[1]; 88 } icmp_dun; 89#define icmp_otime icmp_dun.id_ts.its_otime 90#define icmp_rtime icmp_dun.id_ts.its_rtime 91#define icmp_ttime icmp_dun.id_ts.its_ttime 92#define icmp_ip icmp_dun.id_ip.idi_ip 93#define icmp_mask icmp_dun.id_mask 94#define icmp_data icmp_dun.id_data 95}; 96 97/* 98 * Lower bounds on packet lengths for various types. 99 * For the error advice packets must first insure that the 100 * packet is large enought to contain the returned ip header. 101 * Only then can we do the check to see if 64 bits of packet 102 * data have been returned, since we need to check the returned 103 * ip header length. 104 */ 105#define ICMP_MINLEN 8 /* abs minimum */ 106#define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */ 107#define ICMP_MASKLEN 12 /* address mask */ 108#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 109#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) 110 /* N.B.: must separately check that ip_hl >= 5 */ 111 112/* 113 * Definition of type and code field values. 114 */ 115#define ICMP_ECHOREPLY 0 /* echo reply */ 116#define ICMP_UNREACH 3 /* dest unreachable, codes: */ 117#define ICMP_UNREACH_NET 0 /* bad net */ 118#define ICMP_UNREACH_HOST 1 /* bad host */ 119#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 120#define ICMP_UNREACH_PORT 3 /* bad port */ 121#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 122#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 123#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 124#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 125#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 126#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ 127#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 128#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 129#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 130#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 131#define ICMP_REDIRECT 5 /* shorter route, codes: */ 132#define ICMP_REDIRECT_NET 0 /* for network */ 133#define ICMP_REDIRECT_HOST 1 /* for host */ 134#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 135#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 136#define ICMP_ECHO 8 /* echo service */ 137#define ICMP_ROUTERADVERT 9 /* router advertisement */ 138#define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 139#define ICMP_TIMXCEED 11 /* time exceeded, code: */ 140#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 141#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 142#define ICMP_PARAMPROB 12 /* ip header bad */ 143#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 144#define ICMP_TSTAMP 13 /* timestamp request */ 145#define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 146#define ICMP_IREQ 15 /* information request */ 147#define ICMP_IREQREPLY 16 /* information reply */ 148#define ICMP_MASKREQ 17 /* address mask request */ 149#define ICMP_MASKREPLY 18 /* address mask reply */ 150 151#define ICMP_MAXTYPE 18 152 153#define ICMP_INFOTYPE(type) \ 154 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 155 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 156 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 157 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 158 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 159 160void icmp_input _P((MBuf , int)); 161void icmp_error _P((MBuf , u_char, u_char, int, char *)); 162void icmp_reflect _P((MBuf )); 163 164#endif 165