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 #include <config.h>
  27
  28 #include "netdissect-stdinc.h"
  29
  30 #include "netdissect.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         nd_ipv6         rip6_dest;
  69         nd_uint16_t     rip6_tag;
  70         nd_uint8_t      rip6_plen;
  71         nd_uint8_t      rip6_metric;
  72 };
  73
  74 struct  rip6 {
  75         nd_uint8_t      rip6_cmd;
  76         nd_uint8_t      rip6_vers;
  77         nd_byte         rip6_res1[2];
  78         struct netinfo6 rip6_nets[1];
  79 };
  80
  81 #define HOPCNT_INFINITY6        16
  82
  83 static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr)
  84 {
  85     static const nd_ipv6 in6addr_any_val = { 0 };        /* :: */
  86     return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0);
  87 }
  88
  89 static void
  90 rip6_entry_print(netdissect_options *ndo,
  91                  const struct netinfo6 *ni, const u_int print_metric)
  92 {
  93         uint16_t tag;
  94         uint8_t metric;
  95
  96         ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest),
  97                  GET_U_1(ni->rip6_plen));
  98         tag = GET_BE_U_2(ni->rip6_tag);
  99         if (tag)
 100                 ND_PRINT(" [%u]", tag);
 101         metric = GET_U_1(ni->rip6_metric);
 102         if (metric && print_metric)
 103                 ND_PRINT(" (%u)", metric);
 104 }
 105
 106 void
 107 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
 108 {
 109         const struct rip6 *rp = (const struct rip6 *)dat;
 110         uint8_t cmd, vers;
 111         const struct netinfo6 *ni;
 112         unsigned int length_left;
 113         u_int j;
 114
 115         ndo->ndo_protocol = "ripng";
 116         vers = GET_U_1(rp->rip6_vers);
 117         if (vers != RIP6_VERSION) {
 118                 nd_print_protocol(ndo);
 119                 ND_PRINT(" [version %u, must be %u]", vers, RIP6_VERSION);
 120                 goto invalid;
 121         }
 122         cmd = GET_U_1(rp->rip6_cmd);
 123         switch (cmd) {
 124
 125         case RIP6_REQUEST:
 126                 length_left = length;
 127                 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
 128                         goto invalid;
 129                 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
 130                 j = length_left / sizeof(*ni);
 131                 if (j == 1) {
 132                         if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6
 133                             && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
 134                                 ND_PRINT(" ripng-req dump");
 135                                 break;
 136                         }
 137                 }
 138                 if (j * sizeof(*ni) != length_left)
 139                         ND_PRINT(" ripng-req %u[%u]:", j, length);
 140                 else
 141                         ND_PRINT(" ripng-req %u:", j);
 142                 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
 143                     length_left -= sizeof(*ni), ++ni) {
 144                         if (ndo->ndo_vflag > 1)
 145                                 ND_PRINT("\n\t");
 146                         else
 147                                 ND_PRINT(" ");
 148                         rip6_entry_print(ndo, ni, FALSE);
 149                 }
 150                 if (length_left != 0)
 151                         goto invalid;
 152                 break;
 153         case RIP6_RESPONSE:
 154                 length_left = length;
 155                 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
 156                         goto invalid;
 157                 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
 158                 j = length_left / sizeof(*ni);
 159                 if (j * sizeof(*ni) != length_left)
 160                         ND_PRINT(" ripng-resp %u[%u]:", j, length);
 161                 else
 162                         ND_PRINT(" ripng-resp %u:", j);
 163                 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
 164                     length_left -= sizeof(*ni), ++ni) {
 165                         if (ndo->ndo_vflag > 1)
 166                                 ND_PRINT("\n\t");
 167                         else
 168                                 ND_PRINT(" ");
 169                         rip6_entry_print(ndo, ni, TRUE);
 170                 }
 171                 if (length_left != 0)
 172                         goto invalid;
 173                 break;
 174         default:
 175                 ND_PRINT(" ripng-%u ?? %u", cmd, length);
 176                 goto invalid;
 177         }
 178         return;
 179
 180 invalid:
 181         nd_print_invalid(ndo);
 182 }