The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_icmp.h

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    1 /*      $NetBSD: ip_icmp.h,v 1.23 2006/05/14 02:34:41 christos 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 #ifndef _NETINET_IP_ICMP_H_
   35 #define _NETINET_IP_ICMP_H_
   36 
   37 
   38 /*
   39  * Interface Control Message Protocol Definitions.
   40  * Per RFC 792, September 1981.
   41  */
   42 
   43 /*
   44  * Internal of an ICMP Router Advertisement
   45  */
   46 struct icmp_ra_addr {
   47         u_int32_t ira_addr;
   48         u_int32_t ira_preference;
   49 } __attribute__((__packed__));
   50 
   51 /*
   52  * Structure of an icmp header.
   53  */
   54 struct icmp {
   55         u_int8_t  icmp_type;            /* type of message, see below */
   56         u_int8_t  icmp_code;            /* type sub code */
   57         u_int16_t icmp_cksum;           /* ones complement cksum of struct */
   58         union {
   59                 u_int8_t  ih_pptr;              /* ICMP_PARAMPROB */
   60                 struct in_addr ih_gwaddr;       /* ICMP_REDIRECT */
   61                 struct ih_idseq {
   62                           n_short icd_id;
   63                           n_short icd_seq;
   64                 } ih_idseq __attribute__((__packed__));
   65                 int32_t   ih_void;
   66 
   67                 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
   68                 struct ih_pmtu {
   69                           n_short ipm_void;
   70                           n_short ipm_nextmtu;
   71                 } ih_pmtu __attribute__((__packed__));
   72                 struct ih_rtradv {
   73                         u_int8_t irt_num_addrs;
   74                         u_int8_t irt_wpa;
   75                         u_int16_t irt_lifetime;
   76                 } ih_rtradv __attribute__((__packed__));
   77         } icmp_hun /* XXX __attribute__((__packed__)) ??? */;
   78 #define icmp_pptr         icmp_hun.ih_pptr
   79 #define icmp_gwaddr       icmp_hun.ih_gwaddr
   80 #define icmp_id           icmp_hun.ih_idseq.icd_id
   81 #define icmp_seq          icmp_hun.ih_idseq.icd_seq
   82 #define icmp_void         icmp_hun.ih_void
   83 #define icmp_pmvoid       icmp_hun.ih_pmtu.ipm_void
   84 #define icmp_nextmtu      icmp_hun.ih_pmtu.ipm_nextmtu
   85 #define icmp_num_addrs    icmp_hun.ih_rtradv.irt_num_addrs
   86 #define icmp_wpa          icmp_hun.ih_rtradv.irt_wpa
   87 #define icmp_lifetime     icmp_hun.ih_rtradv.irt_lifetime
   88         union {
   89                 struct id_ts {
   90                           n_time its_otime;
   91                           n_time its_rtime;
   92                           n_time its_ttime;
   93                 } id_ts __attribute__((__packed__));
   94                 struct id_ip  {
   95                           struct ip idi_ip;
   96                           /* options and then 64 bits of data */
   97                 } id_ip /* XXX: __attribute__((__packed__)) ??? */;
   98                 struct icmp_ra_addr id_radv;
   99                 u_int32_t id_mask;
  100                 int8_t    id_data[1];
  101         } icmp_dun /* XXX __attribute__((__packed__)) ??? */;
  102 #define icmp_otime        icmp_dun.id_ts.its_otime
  103 #define icmp_rtime        icmp_dun.id_ts.its_rtime
  104 #define icmp_ttime        icmp_dun.id_ts.its_ttime
  105 #define icmp_ip           icmp_dun.id_ip.idi_ip
  106 #define icmp_radv         icmp_dun.id_mask
  107 #define icmp_mask         icmp_dun.id_mask
  108 #define icmp_data         icmp_dun.id_data
  109 };
  110 
  111 /*
  112  * Lower bounds on packet lengths for various types.
  113  * For the error advice packets must first insure that the
  114  * packet is large enought to contain the returned ip header.
  115  * Only then can we do the check to see if 64 bits of packet
  116  * data have been returned, since we need to check the returned
  117  * ip header length.
  118  */
  119 #define ICMP_MINLEN     8                               /* abs minimum */
  120 #define ICMP_TSLEN      (8 + 3 * sizeof (n_time))       /* timestamp */
  121 #define ICMP_MASKLEN    12                              /* address mask */
  122 #define ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
  123 #define ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
  124         /* N.B.: must separately check that ip_hl >= 5 */
  125 
  126 /*
  127  * Definition of type and code field values.
  128  */
  129 #define ICMP_ECHOREPLY          0               /* echo reply */
  130 #define ICMP_UNREACH            3               /* dest unreachable, codes: */
  131 #define         ICMP_UNREACH_NET        0               /* bad net */
  132 #define         ICMP_UNREACH_HOST       1               /* bad host */
  133 #define         ICMP_UNREACH_PROTOCOL   2               /* bad protocol */
  134 #define         ICMP_UNREACH_PORT       3               /* bad port */
  135 #define         ICMP_UNREACH_NEEDFRAG   4               /* IP_DF caused drop */
  136 #define         ICMP_UNREACH_SRCFAIL    5               /* src route failed */
  137 #define         ICMP_UNREACH_NET_UNKNOWN 6              /* unknown net */
  138 #define         ICMP_UNREACH_HOST_UNKNOWN 7             /* unknown host */
  139 #define         ICMP_UNREACH_ISOLATED   8               /* src host isolated */
  140 #define         ICMP_UNREACH_NET_PROHIB 9               /* prohibited access */
  141 #define         ICMP_UNREACH_HOST_PROHIB 10             /* ditto */
  142 #define         ICMP_UNREACH_TOSNET     11              /* bad tos for net */
  143 #define         ICMP_UNREACH_TOSHOST    12              /* bad tos for host */
  144 #define         ICMP_UNREACH_ADMIN_PROHIBIT 13          /* communication
  145                                                            administratively
  146                                                            prohibited */
  147 #define ICMP_SOURCEQUENCH       4               /* packet lost, slow down */
  148 #define ICMP_REDIRECT           5               /* shorter route, codes: */
  149 #define         ICMP_REDIRECT_NET       0               /* for network */
  150 #define         ICMP_REDIRECT_HOST      1               /* for host */
  151 #define         ICMP_REDIRECT_TOSNET    2               /* for tos and net */
  152 #define         ICMP_REDIRECT_TOSHOST   3               /* for tos and host */
  153 #define ICMP_ECHO               8               /* echo service */
  154 #define ICMP_ROUTERADVERT       9               /* router advertisement */
  155 #define ICMP_ROUTERSOLICIT      10              /* router solicitation */
  156 #define ICMP_TIMXCEED           11              /* time exceeded, code: */
  157 #define         ICMP_TIMXCEED_INTRANS   0               /* ttl==0 in transit */
  158 #define         ICMP_TIMXCEED_REASS     1               /* ttl==0 in reass */
  159 #define ICMP_PARAMPROB          12              /* ip header bad */
  160 #define         ICMP_PARAMPROB_OPTABSENT 1              /* req. opt. absent */
  161 #define ICMP_TSTAMP             13              /* timestamp request */
  162 #define ICMP_TSTAMPREPLY        14              /* timestamp reply */
  163 #define ICMP_IREQ               15              /* information request */
  164 #define ICMP_IREQREPLY          16              /* information reply */
  165 #define ICMP_MASKREQ            17              /* address mask request */
  166 #define ICMP_MASKREPLY          18              /* address mask reply */
  167 
  168 #define ICMP_MAXTYPE            18
  169 
  170 #define ICMP_INFOTYPE(type) \
  171         ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
  172         (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
  173         (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
  174         (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
  175         (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
  176 
  177 #ifdef _KERNEL
  178 void    icmp_error(struct mbuf *, int, int, n_long, int);
  179 void    icmp_mtudisc(struct icmp *, struct in_addr);
  180 void    icmp_input(struct mbuf *, ...);
  181 void    icmp_init(void);
  182 void    icmp_reflect(struct mbuf *);
  183 void    icmp_send(struct mbuf *, struct mbuf *);
  184 int     icmp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
  185 
  186 void    icmp_mtudisc_callback_register(void (*)(struct in_addr));
  187 #endif
  188 
  189 
  190 #endif /* !_NETINET_IP_ICMP_H_ */

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