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 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  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         union {
  79                 struct  netinfo6        ru6_nets[1];
  80                 nd_byte 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 static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr)
  89 {
  90     static const struct in6_addr in6addr_any;        /* :: */
  91     return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
  92 }
  93
  94 static int
  95 rip6_entry_print(netdissect_options *ndo, const struct netinfo6 *ni, u_int metric)
  96 {
  97         int l;
  98         uint16_t tag;
  99
 100         l = ND_PRINT("%s/%u", ip6addr_string(ndo, &ni->rip6_dest), EXTRACT_U_1(ni->rip6_plen));
 101         tag = EXTRACT_BE_U_2(ni->rip6_tag);
 102         if (tag)
 103                 l += ND_PRINT(" [%u]", tag);
 104         if (metric)
 105                 l += ND_PRINT(" (%u)", metric);
 106         return l;
 107 }
 108
 109 void
 110 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
 111 {
 112         const struct rip6 *rp = (const struct rip6 *)dat;
 113         uint8_t cmd;
 114         const struct netinfo6 *ni;
 115         unsigned int length_left;
 116         u_int j;
 117
 118         ND_TCHECK_1(rp->rip6_cmd);
 119         cmd = EXTRACT_U_1(rp->rip6_cmd);
 120         switch (cmd) {
 121
 122         case RIP6_REQUEST:
 123                 length_left = length;
 124                 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
 125                         goto trunc;
 126                 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
 127                 j = length_left / sizeof(*ni);
 128                 if (j == 1) {
 129                         ND_TCHECK_SIZE(rp->rip6_nets);
 130                         if (EXTRACT_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6
 131                             && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
 132                                 ND_PRINT(" ripng-req dump");
 133                                 break;
 134                         }
 135                 }
 136                 if (j * sizeof(*ni) != length_left)
 137                         ND_PRINT(" ripng-req %u[%u]:", j, length);
 138                 else
 139                         ND_PRINT(" ripng-req %u:", j);
 140                 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
 141                     length_left -= sizeof(*ni), ++ni) {
 142                         ND_TCHECK_SIZE(ni);
 143                         if (ndo->ndo_vflag > 1)
 144                                 ND_PRINT("\n\t");
 145                         else
 146                                 ND_PRINT(" ");
 147                         rip6_entry_print(ndo, ni, 0);
 148                 }
 149                 if (length_left != 0)
 150                         goto trunc;
 151                 break;
 152         case RIP6_RESPONSE:
 153                 length_left = length;
 154                 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
 155                         goto trunc;
 156                 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
 157                 j = length_left / sizeof(*ni);
 158                 if (j * sizeof(*ni) != length_left)
 159                         ND_PRINT(" ripng-resp %u[%u]:", j, length);
 160                 else
 161                         ND_PRINT(" ripng-resp %u:", j);
 162                 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
 163                     length_left -= sizeof(*ni), ++ni) {
 164                         ND_TCHECK_SIZE(ni);
 165                         if (ndo->ndo_vflag > 1)
 166                                 ND_PRINT("\n\t");
 167                         else
 168                                 ND_PRINT(" ");
 169                         rip6_entry_print(ndo, ni, EXTRACT_U_1(ni->rip6_metric));
 170                 }
 171                 if (length_left != 0)
 172                         goto trunc;
 173                 break;
 174         default:
 175                 ND_PRINT(" ripng-%u ?? %u", cmd, length);
 176                 break;
 177         }
 178         ND_TCHECK_1(rp->rip6_vers);
 179         if (EXTRACT_U_1(rp->rip6_vers) != RIP6_VERSION)
 180                 ND_PRINT(" [vers %u]", EXTRACT_U_1(rp->rip6_vers));
 181         return;
 182
 183 trunc:
 184         ND_PRINT("[|ripng]");
 185         return;
 186 }