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 #include <sys/cdefs.h> 23 #ifndef lint 24 __RCSID("$NetBSD: print-ripng.c,v 1.4 2014/11/20 03:05:03 christos Exp $"); 25 #endif 26 27 #define NETDISSECT_REWORKED 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #ifdef INET6 33 34 #include <tcpdump-stdinc.h> 35 36 #include "interface.h" 37 #include "addrtoname.h" 38 #include "extract.h" 39 40 /* 41 * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project. 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. Neither the name of the project nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 */ 68 #define RIP6_VERSION 1 69 70 #define RIP6_REQUEST 1 71 #define RIP6_RESPONSE 2 72 73 struct netinfo6 { 74 struct in6_addr rip6_dest; 75 uint16_t rip6_tag; 76 uint8_t rip6_plen; 77 uint8_t rip6_metric; 78 }; 79 80 struct rip6 { 81 uint8_t rip6_cmd; 82 uint8_t rip6_vers; 83 uint8_t rip6_res1[2]; 84 union { 85 struct netinfo6 ru6_nets[1]; 86 char ru6_tracefile[1]; 87 } rip6un; 88 #define rip6_nets rip6un.ru6_nets 89 #define rip6_tracefile rip6un.ru6_tracefile 90 }; 91 92 #define HOPCNT_INFINITY6 16 93 94 #if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */ 95 static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr) 96 { 97 static const struct in6_addr in6addr_any; /* :: */ 98 return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0); 99 } 100 #endif 101 102 static int 103 rip6_entry_print(netdissect_options *ndo, register const struct netinfo6 *ni, int metric) 104 { 105 int l; 106 l = ND_PRINT((ndo, "%s/%d", ip6addr_string(ndo, &ni->rip6_dest), ni->rip6_plen)); 107 if (ni->rip6_tag) 108 l += ND_PRINT((ndo, " [%d]", EXTRACT_16BITS(&ni->rip6_tag))); 109 if (metric) 110 l += ND_PRINT((ndo, " (%d)", ni->rip6_metric)); 111 return l; 112 } 113 114 void 115 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length) 116 { 117 register const struct rip6 *rp = (struct rip6 *)dat; 118 register const struct netinfo6 *ni; 119 register u_int amt; 120 register u_int i; 121 int j; 122 int trunc; 123 124 if (ndo->ndo_snapend < dat) 125 return; 126 amt = ndo->ndo_snapend - dat; 127 i = min(length, amt); 128 if (i < (sizeof(struct rip6) - sizeof(struct netinfo6))) 129 return; 130 i -= (sizeof(struct rip6) - sizeof(struct netinfo6)); 131 132 switch (rp->rip6_cmd) { 133 134 case RIP6_REQUEST: 135 j = length / sizeof(*ni); 136 if (j == 1 137 && rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6 138 && IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) { 139 ND_PRINT((ndo, " ripng-req dump")); 140 break; 141 } 142 if (j * sizeof(*ni) != length - 4) 143 ND_PRINT((ndo, " ripng-req %d[%u]:", j, length)); 144 else 145 ND_PRINT((ndo, " ripng-req %d:", j)); 146 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i); 147 for (ni = rp->rip6_nets; i >= sizeof(*ni); 148 i -= sizeof(*ni), ++ni) { 149 if (ndo->ndo_vflag > 1) 150 ND_PRINT((ndo, "\n\t")); 151 else 152 ND_PRINT((ndo, " ")); 153 rip6_entry_print(ndo, ni, 0); 154 } 155 break; 156 case RIP6_RESPONSE: 157 j = length / sizeof(*ni); 158 if (j * sizeof(*ni) != length - 4) 159 ND_PRINT((ndo, " ripng-resp %d[%u]:", j, length)); 160 else 161 ND_PRINT((ndo, " ripng-resp %d:", j)); 162 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i); 163 for (ni = rp->rip6_nets; i >= sizeof(*ni); 164 i -= sizeof(*ni), ++ni) { 165 if (ndo->ndo_vflag > 1) 166 ND_PRINT((ndo, "\n\t")); 167 else 168 ND_PRINT((ndo, " ")); 169 rip6_entry_print(ndo, ni, ni->rip6_metric); 170 } 171 if (trunc) 172 ND_PRINT((ndo, "[|ripng]")); 173 break; 174 default: 175 ND_PRINT((ndo, " ripng-%d ?? %u", rp->rip6_cmd, length)); 176 break; 177 } 178 if (rp->rip6_vers != RIP6_VERSION) 179 ND_PRINT((ndo, " [vers %d]", rp->rip6_vers)); 180 } 181 #endif /* INET6 */ 182