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