slirp/ip_icmp.h

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