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 /* \summary: IPv6 Routing Information Protocol (RIPng) printer */
  23
  24 /* specification: RFC 2080 */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include <config.h>
  28 #endif
  29
  30 #include "netdissect-stdinc.h"
  31
  32 #include "netdissect.h"
  33 #include "addrtoname.h"
  34 #include "extract.h"
  35
  36 /*
  37  * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project.
  38  * All rights reserved.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  * 3. Neither the name of the project nor the names of its contributors
  49  *    may be used to endorse or promote products derived from this software
  50  *    without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62  * SUCH DAMAGE.
  63  */
  64 #define RIP6_VERSION    1
  65
  66 #define RIP6_REQUEST    1
  67 #define RIP6_RESPONSE   2
  68
  69 struct netinfo6 {
  70         nd_ipv6         rip6_dest;
  71         nd_uint16_t     rip6_tag;
  72         nd_uint8_t      rip6_plen;
  73         nd_uint8_t      rip6_metric;
  74 };
  75
  76 struct  rip6 {
  77         nd_uint8_t      rip6_cmd;
  78         nd_uint8_t      rip6_vers;
  79         nd_byte         rip6_res1[2];
  80         struct netinfo6 rip6_nets[1];
  81 };
  82
  83 #define HOPCNT_INFINITY6        16
  84
  85 static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr)
  86 {
  87     static const nd_ipv6 in6addr_any_val = { 0 };        /* :: */
  88     return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0);
  89 }
  90
  91 static void
  92 rip6_entry_print(netdissect_options *ndo,
  93                  const struct netinfo6 *ni, const u_int print_metric)
  94 {
  95         uint16_t tag;
  96         uint8_t metric;
  97
  98         ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest),
  99                  GET_U_1(ni->rip6_plen));
 100         tag = GET_BE_U_2(ni->rip6_tag);
 101         if (tag)
 102                 ND_PRINT(" [%u]", tag);
 103         metric = GET_U_1(ni->rip6_metric);
 104         if (metric && print_metric)
 105                 ND_PRINT(" (%u)", metric);
 106 }
 107
 108 void
 109 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
 110 {
 111         const struct rip6 *rp = (const struct rip6 *)dat;
 112         uint8_t cmd, vers;
 113         const struct netinfo6 *ni;
 114         unsigned int length_left;
 115         u_int j;
 116
 117         ndo->ndo_protocol = "ripng";
 118         vers = GET_U_1(rp->rip6_vers);
 119         if (vers != RIP6_VERSION) {
 120                 ND_PRINT(" [vers %u]", vers);
 121                 goto invalid;
 122         }
 123         cmd = GET_U_1(rp->rip6_cmd);
 124         switch (cmd) {
 125
 126         case RIP6_REQUEST:
 127                 length_left = length;
 128                 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
 129                         goto invalid;
 130                 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
 131                 j = length_left / sizeof(*ni);
 132                 if (j == 1) {
 133                         if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6
 134                             && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
 135                                 ND_PRINT(" ripng-req dump");
 136                                 break;
 137                         }
 138                 }
 139                 if (j * sizeof(*ni) != length_left)
 140                         ND_PRINT(" ripng-req %u[%u]:", j, length);
 141                 else
 142                         ND_PRINT(" ripng-req %u:", j);
 143                 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
 144                     length_left -= sizeof(*ni), ++ni) {
 145                         if (ndo->ndo_vflag > 1)
 146                                 ND_PRINT("\n\t");
 147                         else
 148                                 ND_PRINT(" ");
 149                         rip6_entry_print(ndo, ni, FALSE);
 150                 }
 151                 if (length_left != 0)
 152                         goto invalid;
 153                 break;
 154         case RIP6_RESPONSE:
 155                 length_left = length;
 156                 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
 157                         goto invalid;
 158                 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
 159                 j = length_left / sizeof(*ni);
 160                 if (j * sizeof(*ni) != length_left)
 161                         ND_PRINT(" ripng-resp %u[%u]:", j, length);
 162                 else
 163                         ND_PRINT(" ripng-resp %u:", j);
 164                 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
 165                     length_left -= sizeof(*ni), ++ni) {
 166                         if (ndo->ndo_vflag > 1)
 167                                 ND_PRINT("\n\t");
 168                         else
 169                                 ND_PRINT(" ");
 170                         rip6_entry_print(ndo, ni, TRUE);
 171                 }
 172                 if (length_left != 0)
 173                         goto invalid;
 174                 break;
 175         default:
 176                 ND_PRINT(" ripng-%u ?? %u", cmd, length);
 177                 goto invalid;
 178         }
 179         return;
 180
 181 invalid:
 182         nd_print_invalid(ndo);
 183 }