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