includes/netinet/ip_icmp.h

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00001 /*      $NetBSD: ip_icmp.h,v 1.11 1996/08/03 15:48:18 neil Exp $        */
00002 
00003 /*
00004  * Copyright (c) 1982, 1986, 1993
00005  *      The Regents of the University of California.  All rights reserved.
00006  *
00007  * Redistribution and use in source and binary forms, with or without
00008  * modification, are permitted provided that the following conditions
00009  * are met:
00010  * 1. Redistributions of source code must retain the above copyright
00011  *    notice, this list of conditions and the following disclaimer.
00012  * 2. Redistributions in binary form must reproduce the above copyright
00013  *    notice, this list of conditions and the following disclaimer in the
00014  *    documentation and/or other materials provided with the distribution.
00015  * 3. Neither the name of the University nor the names of its contributors
00016  *    may be used to endorse or promote products derived from this software
00017  *    without specific prior written permission.
00018  *
00019  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00020  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00021  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00022  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00023  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00024  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00025  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00026  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00027  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00028  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00029  * SUCH DAMAGE.
00030  *
00031  *      @(#)ip_icmp.h   8.1 (Berkeley) 6/10/93
00032  */
00033 
00034 
00035 /*
00036  * Interface Control Message Protocol Definitions.
00037  * Per RFC 792, September 1981.
00038  */
00039 
00040 /*
00041  * Internal of an ICMP Router Advertisement
00042  */
00043 struct icmp_ra_addr {
00044         u_int32_t ira_addr;
00045         u_int32_t ira_preference;
00046 };
00047 
00048 /*
00049  * Structure of an icmp header.
00050  */
00051 struct icmp {
00052         u_int8_t  icmp_type;            /* type of message, see below */
00053         u_int8_t  icmp_code;            /* type sub code */
00054         u_int16_t icmp_cksum;           /* ones complement cksum of struct */
00055         union {
00056                 u_int8_t  ih_pptr;              /* ICMP_PARAMPROB */
00057                 struct in_addr ih_gwaddr;       /* ICMP_REDIRECT */
00058                 struct ih_idseq {
00059                           int16_t icd_id;
00060                           int16_t icd_seq;
00061                 } ih_idseq;
00062                 int32_t   ih_void;
00063 
00064                 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
00065                 struct ih_pmtu {
00066                           int16_t ipm_void;    
00067                           int16_t ipm_nextmtu;
00068                 } ih_pmtu;
00069                 struct ih_rtradv {
00070                         u_int8_t irt_num_addrs;
00071                         u_int8_t irt_wpa;
00072                         u_int16_t irt_lifetime;
00073                 } ih_rtradv;
00074         } icmp_hun;
00075 #define icmp_pptr         icmp_hun.ih_pptr
00076 #define icmp_gwaddr       icmp_hun.ih_gwaddr
00077 #define icmp_id           icmp_hun.ih_idseq.icd_id
00078 #define icmp_seq          icmp_hun.ih_idseq.icd_seq
00079 #define icmp_void         icmp_hun.ih_void
00080 #define icmp_pmvoid       icmp_hun.ih_pmtu.ipm_void
00081 #define icmp_nextmtu      icmp_hun.ih_pmtu.ipm_nextmtu
00082 #define icmp_num_addrs    icmp_hun.ih_rtradv.irt_num_addrs
00083 #define icmp_wpa          icmp_hun.ih_rtradv.irt_wpa
00084 #define icmp_lifetime     icmp_hun.ih_rtradv.irt_lifetime
00085         union {
00086                 struct id_ts {
00087                           u_int32_t its_otime;
00088                           u_int32_t its_rtime;
00089                           u_int32_t its_ttime;
00090                 } id_ts;
00091                 struct id_ip  {
00092                           struct ip idi_ip;
00093                           /* options and then 64 bits of data */
00094                 } id_ip;
00095                 struct icmp_ra_addr id_radv;
00096                 u_int32_t id_mask;
00097                 int8_t    id_data[1];
00098         } icmp_dun;
00099 #define icmp_otime        icmp_dun.id_ts.its_otime
00100 #define icmp_rtime        icmp_dun.id_ts.its_rtime
00101 #define icmp_ttime        icmp_dun.id_ts.its_ttime
00102 #define icmp_ip           icmp_dun.id_ip.idi_ip
00103 #define icmp_radv         icmp_dun.id_mask
00104 #define icmp_mask         icmp_dun.id_mask
00105 #define icmp_data         icmp_dun.id_data
00106 };
00107 
00108 /*
00109  * Lower bounds on packet lengths for various types.
00110  * For the error advice packets must first insure that the
00111  * packet is large enought to contain the returned ip header.
00112  * Only then can we do the check to see if 64 bits of packet
00113  * data have been returned, since we need to check the returned
00114  * ip header length.
00115  */
00116 #define ICMP_MINLEN     8                               /* abs minimum */
00117 #define ICMP_TSLEN      (8 + 3 * sizeof (u_int32_t))    /* timestamp */
00118 #define ICMP_MASKLEN    12                              /* address mask */
00119 #define ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
00120 #define ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
00121         /* N.B.: must separately check that ip_hl >= 5 */
00122 
00123 /*
00124  * Definition of type and code field values.
00125  */
00126 #define ICMP_ECHOREPLY          0               /* echo reply */
00127 #define ICMP_UNREACH            3               /* dest unreachable, codes: */
00128 #define         ICMP_UNREACH_NET        0               /* bad net */
00129 #define         ICMP_UNREACH_HOST       1               /* bad host */
00130 #define         ICMP_UNREACH_PROTOCOL   2               /* bad protocol */
00131 #define         ICMP_UNREACH_PORT       3               /* bad port */
00132 #define         ICMP_UNREACH_NEEDFRAG   4               /* IP_DF caused drop */
00133 #define         ICMP_UNREACH_SRCFAIL    5               /* src route failed */
00134 #define         ICMP_UNREACH_NET_UNKNOWN 6              /* unknown net */
00135 #define         ICMP_UNREACH_HOST_UNKNOWN 7             /* unknown host */
00136 #define         ICMP_UNREACH_ISOLATED   8               /* src host isolated */
00137 #define         ICMP_UNREACH_NET_PROHIB 9               /* prohibited access */
00138 #define         ICMP_UNREACH_HOST_PROHIB 10             /* ditto */
00139 #define         ICMP_UNREACH_TOSNET     11              /* bad tos for net */
00140 #define         ICMP_UNREACH_TOSHOST    12              /* bad tos for host */
00141 #define ICMP_SOURCEQUENCH       4               /* packet lost, slow down */
00142 #define ICMP_REDIRECT           5               /* shorter route, codes: */
00143 #define         ICMP_REDIRECT_NET       0               /* for network */
00144 #define         ICMP_REDIRECT_HOST      1               /* for host */
00145 #define         ICMP_REDIRECT_TOSNET    2               /* for tos and net */
00146 #define         ICMP_REDIRECT_TOSHOST   3               /* for tos and host */
00147 #define ICMP_ECHO               8               /* echo service */
00148 #define ICMP_ROUTERADVERT       9               /* router advertisement */
00149 #define ICMP_ROUTERSOLICIT      10              /* router solicitation */
00150 #define ICMP_TIMXCEED           11              /* time exceeded, code: */
00151 #define         ICMP_TIMXCEED_INTRANS   0               /* ttl==0 in transit */
00152 #define         ICMP_TIMXCEED_REASS     1               /* ttl==0 in reass */
00153 #define ICMP_PARAMPROB          12              /* ip header bad */
00154 #define         ICMP_PARAMPROB_OPTABSENT 1              /* req. opt. absent */
00155 #define ICMP_TSTAMP             13              /* timestamp request */
00156 #define ICMP_TSTAMPREPLY        14              /* timestamp reply */
00157 #define ICMP_IREQ               15              /* information request */
00158 #define ICMP_IREQREPLY          16              /* information reply */
00159 #define ICMP_MASKREQ            17              /* address mask request */
00160 #define ICMP_MASKREPLY          18              /* address mask reply */
00161 
00162 #define ICMP_MAXTYPE            18
00163 
00164 #define ICMP_INFOTYPE(type) \
00165         ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
00166         (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
00167         (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
00168         (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
00169         (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
00170 
00171 #ifdef _KERNEL
00172 void    icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *));
00173 void    icmp_input __P((struct mbuf *, ...));
00174 void    icmp_reflect __P((struct mbuf *));
00175 void    icmp_send __P((struct mbuf *, struct mbuf *));
00176 int     icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
00177 #endif
00178 

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