dist/dhcp/includes/netinet/ip_icmp.h

   1 /*      $NetBSD: ip_icmp.h,v 1.1 2001/08/03 11:35:35 drochner Exp $     */
   2
   3 /*
   4  * Copyright (c) 1982, 1986, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)ip_icmp.h   8.1 (Berkeley) 6/10/93
  32  */
  33
  34
  35 /*
  36  * Interface Control Message Protocol Definitions.
  37  * Per RFC 792, September 1981.
  38  */
  39
  40 /*
  41  * Internal of an ICMP Router Advertisement
  42  */
  43 struct icmp_ra_addr {
  44         u_int32_t ira_addr;
  45         u_int32_t ira_preference;
  46 };
  47
  48 /*
  49  * Structure of an icmp header.
  50  */
  51 struct icmp {
  52         u_int8_t  icmp_type;            /* type of message, see below */
  53         u_int8_t  icmp_code;            /* type sub code */
  54         u_int16_t icmp_cksum;           /* ones complement cksum of struct */
  55         union {
  56                 u_int8_t  ih_pptr;              /* ICMP_PARAMPROB */
  57                 struct in_addr ih_gwaddr;       /* ICMP_REDIRECT */
  58                 struct ih_idseq {
  59                           int16_t icd_id;
  60                           int16_t icd_seq;
  61                 } ih_idseq;
  62                 int32_t   ih_void;
  63
  64                 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
  65                 struct ih_pmtu {
  66                           int16_t ipm_void;
  67                           int16_t ipm_nextmtu;
  68                 } ih_pmtu;
  69                 struct ih_rtradv {
  70                         u_int8_t irt_num_addrs;
  71                         u_int8_t irt_wpa;
  72                         u_int16_t irt_lifetime;
  73                 } ih_rtradv;
  74         } icmp_hun;
  75 #define icmp_pptr         icmp_hun.ih_pptr
  76 #define icmp_gwaddr       icmp_hun.ih_gwaddr
  77 #define icmp_id           icmp_hun.ih_idseq.icd_id
  78 #define icmp_seq          icmp_hun.ih_idseq.icd_seq
  79 #define icmp_void         icmp_hun.ih_void
  80 #define icmp_pmvoid       icmp_hun.ih_pmtu.ipm_void
  81 #define icmp_nextmtu      icmp_hun.ih_pmtu.ipm_nextmtu
  82 #define icmp_num_addrs    icmp_hun.ih_rtradv.irt_num_addrs
  83 #define icmp_wpa          icmp_hun.ih_rtradv.irt_wpa
  84 #define icmp_lifetime     icmp_hun.ih_rtradv.irt_lifetime
  85         union {
  86                 struct id_ts {
  87                           u_int32_t its_otime;
  88                           u_int32_t its_rtime;
  89                           u_int32_t its_ttime;
  90                 } id_ts;
  91                 struct id_ip  {
  92                           struct ip idi_ip;
  93                           /* options and then 64 bits of data */
  94                 } id_ip;
  95                 struct icmp_ra_addr id_radv;
  96                 u_int32_t id_mask;
  97                 int8_t    id_data[1];
  98         } icmp_dun;
  99 #define icmp_otime        icmp_dun.id_ts.its_otime
 100 #define icmp_rtime        icmp_dun.id_ts.its_rtime
 101 #define icmp_ttime        icmp_dun.id_ts.its_ttime
 102 #define icmp_ip           icmp_dun.id_ip.idi_ip
 103 #define icmp_radv         icmp_dun.id_mask
 104 #define icmp_mask         icmp_dun.id_mask
 105 #define icmp_data         icmp_dun.id_data
 106 };
 107
 108 /*
 109  * Lower bounds on packet lengths for various types.
 110  * For the error advice packets must first insure that the
 111  * packet is large enought to contain the returned ip header.
 112  * Only then can we do the check to see if 64 bits of packet
 113  * data have been returned, since we need to check the returned
 114  * ip header length.
 115  */
 116 #define ICMP_MINLEN     8                               /* abs minimum */
 117 #define ICMP_TSLEN      (8 + 3 * sizeof (u_int32_t))    /* timestamp */
 118 #define ICMP_MASKLEN    12                              /* address mask */
 119 #define ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
 120 #define ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
 121         /* N.B.: must separately check that ip_hl >= 5 */
 122
 123 /*
 124  * Definition of type and code field values.
 125  */
 126 #define ICMP_ECHOREPLY          0               /* echo reply */
 127 #define ICMP_UNREACH            3               /* dest unreachable, codes: */
 128 #define         ICMP_UNREACH_NET        0               /* bad net */
 129 #define         ICMP_UNREACH_HOST       1               /* bad host */
 130 #define         ICMP_UNREACH_PROTOCOL   2               /* bad protocol */
 131 #define         ICMP_UNREACH_PORT       3               /* bad port */
 132 #define         ICMP_UNREACH_NEEDFRAG   4               /* IP_DF caused drop */
 133 #define         ICMP_UNREACH_SRCFAIL    5               /* src route failed */
 134 #define         ICMP_UNREACH_NET_UNKNOWN 6              /* unknown net */
 135 #define         ICMP_UNREACH_HOST_UNKNOWN 7             /* unknown host */
 136 #define         ICMP_UNREACH_ISOLATED   8               /* src host isolated */
 137 #define         ICMP_UNREACH_NET_PROHIB 9               /* prohibited access */
 138 #define         ICMP_UNREACH_HOST_PROHIB 10             /* ditto */
 139 #define         ICMP_UNREACH_TOSNET     11              /* bad tos for net */
 140 #define         ICMP_UNREACH_TOSHOST    12              /* bad tos for host */
 141 #define ICMP_SOURCEQUENCH       4               /* packet lost, slow down */
 142 #define ICMP_REDIRECT           5               /* shorter route, codes: */
 143 #define         ICMP_REDIRECT_NET       0               /* for network */
 144 #define         ICMP_REDIRECT_HOST      1               /* for host */
 145 #define         ICMP_REDIRECT_TOSNET    2               /* for tos and net */
 146 #define         ICMP_REDIRECT_TOSHOST   3               /* for tos and host */
 147 #define ICMP_ECHO               8               /* echo service */
 148 #define ICMP_ROUTERADVERT       9               /* router advertisement */
 149 #define ICMP_ROUTERSOLICIT      10              /* router solicitation */
 150 #define ICMP_TIMXCEED           11              /* time exceeded, code: */
 151 #define         ICMP_TIMXCEED_INTRANS   0               /* ttl==0 in transit */
 152 #define         ICMP_TIMXCEED_REASS     1               /* ttl==0 in reass */
 153 #define ICMP_PARAMPROB          12              /* ip header bad */
 154 #define         ICMP_PARAMPROB_OPTABSENT 1              /* req. opt. absent */
 155 #define ICMP_TSTAMP             13              /* timestamp request */
 156 #define ICMP_TSTAMPREPLY        14              /* timestamp reply */
 157 #define ICMP_IREQ               15              /* information request */
 158 #define ICMP_IREQREPLY          16              /* information reply */
 159 #define ICMP_MASKREQ            17              /* address mask request */
 160 #define ICMP_MASKREPLY          18              /* address mask reply */
 161
 162 #define ICMP_MAXTYPE            18
 163
 164 #define ICMP_INFOTYPE(type) \
 165         ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
 166         (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
 167         (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
 168         (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
 169         (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
 170
 171 #ifdef _KERNEL
 172 void    icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *));
 173 void    icmp_input __P((struct mbuf *, ...));
 174 void    icmp_reflect __P((struct mbuf *));
 175 void    icmp_send __P((struct mbuf *, struct mbuf *));
 176 int     icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
 177 #endif
 178