bsd/netinet/ip_icmp.h

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * Copyright (c) 1982, 1986, 1993
  32  *      The Regents of the University of California.  All rights reserved.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  * 1. Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  * 2. Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in the
  41  *    documentation and/or other materials provided with the distribution.
  42  * 3. All advertising materials mentioning features or use of this software
  43  *    must display the following acknowledgement:
  44  *      This product includes software developed by the University of
  45  *      California, Berkeley and its contributors.
  46  * 4. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)ip_icmp.h   8.1 (Berkeley) 6/10/93
  63  * $FreeBSD: src/sys/netinet/ip_icmp.h,v 1.16 1999/12/29 04:41:01 peter Exp $
  64  */
  65
  66 #ifndef _NETINET_IP_ICMP_H_
  67 #define _NETINET_IP_ICMP_H_
  68 #include <sys/appleapiopts.h>
  69
  70 /*
  71  * Interface Control Message Protocol Definitions.
  72  * Per RFC 792, September 1981.
  73  */
  74
  75 /*
  76  * Internal of an ICMP Router Advertisement
  77  */
  78 struct icmp_ra_addr {
  79         u_int32_t ira_addr;
  80         u_int32_t ira_preference;
  81 };
  82
  83 /*
  84  * Structure of an icmp header.
  85  */
  86 struct icmp {
  87         u_char  icmp_type;              /* type of message, see below */
  88         u_char  icmp_code;              /* type sub code */
  89         u_short icmp_cksum;             /* ones complement cksum of struct */
  90         union {
  91                 u_char ih_pptr;                 /* ICMP_PARAMPROB */
  92                 struct in_addr ih_gwaddr;       /* ICMP_REDIRECT */
  93                 struct ih_idseq {
  94                         n_short icd_id;
  95                         n_short icd_seq;
  96                 } ih_idseq;
  97                 int ih_void;
  98
  99                 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
 100                 struct ih_pmtu {
 101                         n_short ipm_void;
 102                         n_short ipm_nextmtu;
 103                 } ih_pmtu;
 104
 105                 struct ih_rtradv {
 106                         u_char irt_num_addrs;
 107                         u_char irt_wpa;
 108                         u_int16_t irt_lifetime;
 109                 } ih_rtradv;
 110         } icmp_hun;
 111 #define icmp_pptr       icmp_hun.ih_pptr
 112 #define icmp_gwaddr     icmp_hun.ih_gwaddr
 113 #define icmp_id         icmp_hun.ih_idseq.icd_id
 114 #define icmp_seq        icmp_hun.ih_idseq.icd_seq
 115 #define icmp_void       icmp_hun.ih_void
 116 #define icmp_pmvoid     icmp_hun.ih_pmtu.ipm_void
 117 #define icmp_nextmtu    icmp_hun.ih_pmtu.ipm_nextmtu
 118 #define icmp_num_addrs  icmp_hun.ih_rtradv.irt_num_addrs
 119 #define icmp_wpa        icmp_hun.ih_rtradv.irt_wpa
 120 #define icmp_lifetime   icmp_hun.ih_rtradv.irt_lifetime
 121         union {
 122                 struct id_ts {
 123                         n_time its_otime;
 124                         n_time its_rtime;
 125                         n_time its_ttime;
 126                 } id_ts;
 127                 struct id_ip  {
 128                         struct ip idi_ip;
 129                         /* options and then 64 bits of data */
 130                 } id_ip;
 131                 struct icmp_ra_addr id_radv;
 132                 u_int32_t id_mask;
 133                 char    id_data[1];
 134         } icmp_dun;
 135 #define icmp_otime      icmp_dun.id_ts.its_otime
 136 #define icmp_rtime      icmp_dun.id_ts.its_rtime
 137 #define icmp_ttime      icmp_dun.id_ts.its_ttime
 138 #define icmp_ip         icmp_dun.id_ip.idi_ip
 139 #define icmp_radv       icmp_dun.id_radv
 140 #define icmp_mask       icmp_dun.id_mask
 141 #define icmp_data       icmp_dun.id_data
 142 };
 143
 144 /*
 145  * Lower bounds on packet lengths for various types.
 146  * For the error advice packets must first insure that the
 147  * packet is large enough to contain the returned ip header.
 148  * Only then can we do the check to see if 64 bits of packet
 149  * data have been returned, since we need to check the returned
 150  * ip header length.
 151  */
 152 #define ICMP_MINLEN     8                               /* abs minimum */
 153 #define ICMP_TSLEN      (8 + 3 * sizeof (n_time))       /* timestamp */
 154 #define ICMP_MASKLEN    12                              /* address mask */
 155 #define ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
 156 #ifndef _IP_VHL
 157 #define ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
 158         /* N.B.: must separately check that ip_hl >= 5 */
 159 #else
 160 #define ICMP_ADVLEN(p)  (8 + (IP_VHL_HL((p)->icmp_ip.ip_vhl) << 2) + 8)
 161         /* N.B.: must separately check that header length >= 5 */
 162 #endif
 163
 164 /*
 165  * Definition of type and code field values.
 166  */
 167 #define ICMP_ECHOREPLY          0               /* echo reply */
 168 #define ICMP_UNREACH            3               /* dest unreachable, codes: */
 169 #define         ICMP_UNREACH_NET        0               /* bad net */
 170 #define         ICMP_UNREACH_HOST       1               /* bad host */
 171 #define         ICMP_UNREACH_PROTOCOL   2               /* bad protocol */
 172 #define         ICMP_UNREACH_PORT       3               /* bad port */
 173 #define         ICMP_UNREACH_NEEDFRAG   4               /* IP_DF caused drop */
 174 #define         ICMP_UNREACH_SRCFAIL    5               /* src route failed */
 175 #define         ICMP_UNREACH_NET_UNKNOWN 6              /* unknown net */
 176 #define         ICMP_UNREACH_HOST_UNKNOWN 7             /* unknown host */
 177 #define         ICMP_UNREACH_ISOLATED   8               /* src host isolated */
 178 #define         ICMP_UNREACH_NET_PROHIB 9               /* prohibited access */
 179 #define         ICMP_UNREACH_HOST_PROHIB 10             /* ditto */
 180 #define         ICMP_UNREACH_TOSNET     11              /* bad tos for net */
 181 #define         ICMP_UNREACH_TOSHOST    12              /* bad tos for host */
 182 #define         ICMP_UNREACH_FILTER_PROHIB 13           /* admin prohib */
 183 #define         ICMP_UNREACH_HOST_PRECEDENCE 14         /* host prec vio. */
 184 #define         ICMP_UNREACH_PRECEDENCE_CUTOFF 15       /* prec cutoff */
 185 #define ICMP_SOURCEQUENCH       4               /* packet lost, slow down */
 186 #define ICMP_REDIRECT           5               /* shorter route, codes: */
 187 #define         ICMP_REDIRECT_NET       0               /* for network */
 188 #define         ICMP_REDIRECT_HOST      1               /* for host */
 189 #define         ICMP_REDIRECT_TOSNET    2               /* for tos and net */
 190 #define         ICMP_REDIRECT_TOSHOST   3               /* for tos and host */
 191 #define ICMP_ECHO               8               /* echo service */
 192 #define ICMP_ROUTERADVERT       9               /* router advertisement */
 193 #define ICMP_ROUTERSOLICIT      10              /* router solicitation */
 194 #define ICMP_TIMXCEED           11              /* time exceeded, code: */
 195 #define         ICMP_TIMXCEED_INTRANS   0               /* ttl==0 in transit */
 196 #define         ICMP_TIMXCEED_REASS     1               /* ttl==0 in reass */
 197 #define ICMP_PARAMPROB          12              /* ip header bad */
 198 #define         ICMP_PARAMPROB_ERRATPTR 0               /* error at param ptr */
 199 #define         ICMP_PARAMPROB_OPTABSENT 1              /* req. opt. absent */
 200 #define         ICMP_PARAMPROB_LENGTH 2                 /* bad length */
 201 #define ICMP_TSTAMP             13              /* timestamp request */
 202 #define ICMP_TSTAMPREPLY        14              /* timestamp reply */
 203 #define ICMP_IREQ               15              /* information request */
 204 #define ICMP_IREQREPLY          16              /* information reply */
 205 #define ICMP_MASKREQ            17              /* address mask request */
 206 #define ICMP_MASKREPLY          18              /* address mask reply */
 207
 208 #define ICMP_MAXTYPE            18
 209
 210 #define ICMP_INFOTYPE(type) \
 211         ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
 212         (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
 213         (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
 214         (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
 215         (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
 216
 217 #ifdef KERNEL_PRIVATE
 218 void    icmp_error(struct mbuf *, int, int, n_long, struct ifnet *);
 219 void    icmp_input(struct mbuf *, int);
 220 #endif KERNEL_PRIVATE
 221
 222 #endif