external/bsd/tcpdump/dist/print-ripng.c

   1 /*
   2  * Copyright (c) 1989, 1990, 1991, 1993, 1994
   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: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #include <sys/cdefs.h>
  23 #ifndef lint
  24 __RCSID("$NetBSD: print-ripng.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
  25 #endif
  26
  27 #define NETDISSECT_REWORKED
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #ifdef INET6
  33
  34 #include <tcpdump-stdinc.h>
  35
  36 #include "interface.h"
  37 #include "addrtoname.h"
  38 #include "extract.h"
  39
  40 /*
  41  * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project.
  42  * All rights reserved.
  43  *
  44  * Redistribution and use in source and binary forms, with or without
  45  * modification, are permitted provided that the following conditions
  46  * are met:
  47  * 1. Redistributions of source code must retain the above copyright
  48  *    notice, this list of conditions and the following disclaimer.
  49  * 2. Redistributions in binary form must reproduce the above copyright
  50  *    notice, this list of conditions and the following disclaimer in the
  51  *    documentation and/or other materials provided with the distribution.
  52  * 3. Neither the name of the project nor the names of its contributors
  53  *    may be used to endorse or promote products derived from this software
  54  *    without specific prior written permission.
  55  *
  56  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  57  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  58  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  59  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  60  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  61  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  62  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  63  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  64  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  65  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  66  * SUCH DAMAGE.
  67  */
  68 #define RIP6_VERSION    1
  69
  70 #define RIP6_REQUEST    1
  71 #define RIP6_RESPONSE   2
  72
  73 struct netinfo6 {
  74         struct in6_addr rip6_dest;
  75         uint16_t        rip6_tag;
  76         uint8_t         rip6_plen;
  77         uint8_t         rip6_metric;
  78 };
  79
  80 struct  rip6 {
  81         uint8_t         rip6_cmd;
  82         uint8_t         rip6_vers;
  83         uint8_t         rip6_res1[2];
  84         union {
  85                 struct  netinfo6        ru6_nets[1];
  86                 char    ru6_tracefile[1];
  87         } rip6un;
  88 #define rip6_nets       rip6un.ru6_nets
  89 #define rip6_tracefile  rip6un.ru6_tracefile
  90 };
  91
  92 #define HOPCNT_INFINITY6        16
  93
  94 #if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */
  95 static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr)
  96 {
  97     static const struct in6_addr in6addr_any;        /* :: */
  98     return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
  99 }
 100 #endif
 101
 102 static int
 103 rip6_entry_print(netdissect_options *ndo, register const struct netinfo6 *ni, int metric)
 104 {
 105         int l;
 106         l = ND_PRINT((ndo, "%s/%d", ip6addr_string(ndo, &ni->rip6_dest), ni->rip6_plen));
 107         if (ni->rip6_tag)
 108                 l += ND_PRINT((ndo, " [%d]", EXTRACT_16BITS(&ni->rip6_tag)));
 109         if (metric)
 110                 l += ND_PRINT((ndo, " (%d)", ni->rip6_metric));
 111         return l;
 112 }
 113
 114 void
 115 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
 116 {
 117         register const struct rip6 *rp = (struct rip6 *)dat;
 118         register const struct netinfo6 *ni;
 119         register u_int amt;
 120         register u_int i;
 121         int j;
 122         int trunc;
 123
 124         if (ndo->ndo_snapend < dat)
 125                 return;
 126         amt = ndo->ndo_snapend - dat;
 127         i = min(length, amt);
 128         if (i < (sizeof(struct rip6) - sizeof(struct netinfo6)))
 129                 return;
 130         i -= (sizeof(struct rip6) - sizeof(struct netinfo6));
 131
 132         switch (rp->rip6_cmd) {
 133
 134         case RIP6_REQUEST:
 135                 j = length / sizeof(*ni);
 136                 if (j == 1
 137                     &&  rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
 138                     &&  IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
 139                         ND_PRINT((ndo, " ripng-req dump"));
 140                         break;
 141                 }
 142                 if (j * sizeof(*ni) != length - 4)
 143                         ND_PRINT((ndo, " ripng-req %d[%u]:", j, length));
 144                 else
 145                         ND_PRINT((ndo, " ripng-req %d:", j));
 146                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 147                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 148                     i -= sizeof(*ni), ++ni) {
 149                         if (ndo->ndo_vflag > 1)
 150                                 ND_PRINT((ndo, "\n\t"));
 151                         else
 152                                 ND_PRINT((ndo, " "));
 153                         rip6_entry_print(ndo, ni, 0);
 154                 }
 155                 break;
 156         case RIP6_RESPONSE:
 157                 j = length / sizeof(*ni);
 158                 if (j * sizeof(*ni) != length - 4)
 159                         ND_PRINT((ndo, " ripng-resp %d[%u]:", j, length));
 160                 else
 161                         ND_PRINT((ndo, " ripng-resp %d:", j));
 162                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 163                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 164                     i -= sizeof(*ni), ++ni) {
 165                         if (ndo->ndo_vflag > 1)
 166                                 ND_PRINT((ndo, "\n\t"));
 167                         else
 168                                 ND_PRINT((ndo, " "));
 169                         rip6_entry_print(ndo, ni, ni->rip6_metric);
 170                 }
 171                 if (trunc)
 172                         ND_PRINT((ndo, "[|ripng]"));
 173                 break;
 174         default:
 175                 ND_PRINT((ndo, " ripng-%d ?? %u", rp->rip6_cmd, length));
 176                 break;
 177         }
 178         if (rp->rip6_vers != RIP6_VERSION)
 179                 ND_PRINT((ndo, " [vers %d]", rp->rip6_vers));
 180 }
 181 #endif /* INET6 */