| 1 | /*
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| 2 | * Copyright (c) 1982, 1986, 1993
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| 3 | * The Regents of the University of California. All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. All advertising materials mentioning features or use of this software
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| 14 | * must display the following acknowledgement:
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| 15 | * This product includes software developed by the University of
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| 16 | * California, Berkeley and its contributors.
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| 17 | * 4. Neither the name of the University nor the names of its contributors
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| 18 | * may be used to endorse or promote products derived from this software
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| 19 | * without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 31 | * SUCH DAMAGE.
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| 32 | *
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| 33 | * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93
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| 34 | * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp
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| 35 | */
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| 36 |
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| 37 | #ifndef _NETINET_IP_ICMP_H_
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| 38 | #define _NETINET_IP_ICMP_H_
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| 39 |
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| 40 | /*
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| 41 | * Interface Control Message Protocol Definitions.
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| 42 | * Per RFC 792, September 1981.
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| 43 | */
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| 44 |
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| 45 | typedef u_int32_t n_time;
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| 46 |
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| 47 | /*
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| 48 | * Structure of an icmp header.
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| 49 | */
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| 50 | struct icmp {
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| 51 | u_char icmp_type; /* type of message, see below */
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| 52 | u_char icmp_code; /* type sub code */
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| 53 | u_short icmp_cksum; /* ones complement cksum of struct */
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| 54 | union {
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| 55 | u_char ih_pptr; /* ICMP_PARAMPROB */
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| 56 | struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
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| 57 | struct ih_idseq {
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| 58 | u_short icd_id;
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| 59 | u_short icd_seq;
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| 60 | } ih_idseq;
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| 61 | int ih_void;
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| 62 |
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| 63 | /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
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| 64 | struct ih_pmtu {
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| 65 | u_short ipm_void;
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| 66 | u_short ipm_nextmtu;
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| 67 | } ih_pmtu;
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| 68 | } icmp_hun;
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| 69 | #define icmp_pptr icmp_hun.ih_pptr
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| 70 | #define icmp_gwaddr icmp_hun.ih_gwaddr
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| 71 | #define icmp_id icmp_hun.ih_idseq.icd_id
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| 72 | #define icmp_seq icmp_hun.ih_idseq.icd_seq
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| 73 | #define icmp_void icmp_hun.ih_void
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| 74 | #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
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| 75 | #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
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| 76 | union {
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| 77 | struct id_ts {
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| 78 | n_time its_otime;
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| 79 | n_time its_rtime;
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| 80 | n_time its_ttime;
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| 81 | } id_ts;
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| 82 | struct id_ip {
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| 83 | struct ip idi_ip;
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| 84 | /* options and then 64 bits of data */
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| 85 | } id_ip;
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| 86 | uint32_t id_mask;
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| 87 | char id_data[1];
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| 88 | } icmp_dun;
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| 89 | #define icmp_otime icmp_dun.id_ts.its_otime
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| 90 | #define icmp_rtime icmp_dun.id_ts.its_rtime
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| 91 | #define icmp_ttime icmp_dun.id_ts.its_ttime
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| 92 | #define icmp_ip icmp_dun.id_ip.idi_ip
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| 93 | #define icmp_mask icmp_dun.id_mask
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| 94 | #define icmp_data icmp_dun.id_data
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| 95 | };
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| 96 |
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| 97 | /*
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| 98 | * Lower bounds on packet lengths for various types.
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| 99 | * For the error advice packets must first insure that the
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| 100 | * packet is large enought to contain the returned ip header.
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| 101 | * Only then can we do the check to see if 64 bits of packet
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| 102 | * data have been returned, since we need to check the returned
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| 103 | * ip header length.
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| 104 | */
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| 105 | #define ICMP_MINLEN 8 /* abs minimum */
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| 106 | #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
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| 107 | #define ICMP_MASKLEN 12 /* address mask */
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| 108 | #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
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| 109 | #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
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| 110 | /* N.B.: must separately check that ip_hl >= 5 */
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| 111 |
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| 112 | /*
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| 113 | * Definition of type and code field values.
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| 114 | */
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| 115 | #define ICMP_ECHOREPLY 0 /* echo reply */
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| 116 | #define ICMP_UNREACH 3 /* dest unreachable, codes: */
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| 117 | #define ICMP_UNREACH_NET 0 /* bad net */
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| 118 | #define ICMP_UNREACH_HOST 1 /* bad host */
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| 119 | #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
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| 120 | #define ICMP_UNREACH_PORT 3 /* bad port */
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| 121 | #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
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| 122 | #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
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| 123 | #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
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| 124 | #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
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| 125 | #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
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| 126 | #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
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| 127 | #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
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| 128 | #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
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| 129 | #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
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| 130 | #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
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| 131 | #define ICMP_REDIRECT 5 /* shorter route, codes: */
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| 132 | #define ICMP_REDIRECT_NET 0 /* for network */
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| 133 | #define ICMP_REDIRECT_HOST 1 /* for host */
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| 134 | #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
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| 135 | #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
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| 136 | #define ICMP_ECHO 8 /* echo service */
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| 137 | #define ICMP_ROUTERADVERT 9 /* router advertisement */
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| 138 | #define ICMP_ROUTERSOLICIT 10 /* router solicitation */
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| 139 | #define ICMP_TIMXCEED 11 /* time exceeded, code: */
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| 140 | #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
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| 141 | #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
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| 142 | #define ICMP_PARAMPROB 12 /* ip header bad */
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| 143 | #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
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| 144 | #define ICMP_TSTAMP 13 /* timestamp request */
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| 145 | #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
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| 146 | #define ICMP_IREQ 15 /* information request */
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| 147 | #define ICMP_IREQREPLY 16 /* information reply */
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| 148 | #define ICMP_MASKREQ 17 /* address mask request */
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| 149 | #define ICMP_MASKREPLY 18 /* address mask reply */
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| 150 |
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| 151 | #define ICMP_MAXTYPE 18
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| 152 |
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| 153 | #define ICMP_INFOTYPE(type) \
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| 154 | ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
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| 155 | (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
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| 156 | (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
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| 157 | (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
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| 158 | (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
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| 159 |
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| 160 | void icmp_input _P((PNATState, struct mbuf *, int));
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| 161 | void icmp_error _P((PNATState, struct mbuf *, u_char, u_char, int, char *));
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| 162 | void icmp_reflect _P((PNATState, struct mbuf *));
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| 163 |
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| 164 | #endif
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