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 struct in6_addr rip6_dest; 69 uint16_t rip6_tag; 70 uint8_t rip6_plen; 71 uint8_t rip6_metric; 72 }; 73 74 struct rip6 { 75 uint8_t rip6_cmd; 76 uint8_t rip6_vers; 77 uint8_t rip6_res1[2]; 78 union { 79 struct netinfo6 ru6_nets[1]; 80 char 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 #if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */ 89 static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr) 90 { 91 static const struct in6_addr in6addr_any; /* :: */ 92 return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0); 93 } 94 #endif 95 96 static int 97 rip6_entry_print(netdissect_options *ndo, register const struct netinfo6 *ni, int metric) 98 { 99 int l; 100 l = ND_PRINT((ndo, "%s/%d", ip6addr_string(ndo, &ni->rip6_dest), ni->rip6_plen)); 101 if (ni->rip6_tag) 102 l += ND_PRINT((ndo, " [%d]", EXTRACT_16BITS(&ni->rip6_tag))); 103 if (metric) 104 l += ND_PRINT((ndo, " (%d)", ni->rip6_metric)); 105 return l; 106 } 107 108 void 109 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length) 110 { 111 register const struct rip6 *rp = (const struct rip6 *)dat; 112 register const struct netinfo6 *ni; 113 register u_int amt; 114 register u_int i; 115 int j; 116 int trunc; 117 118 if (ndo->ndo_snapend < dat) 119 return; 120 amt = ndo->ndo_snapend - dat; 121 i = min(length, amt); 122 if (i < (sizeof(struct rip6) - sizeof(struct netinfo6))) 123 return; 124 i -= (sizeof(struct rip6) - sizeof(struct netinfo6)); 125 126 switch (rp->rip6_cmd) { 127 128 case RIP6_REQUEST: 129 j = length / sizeof(*ni); 130 if (j == 1 131 && rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6 132 && IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) { 133 ND_PRINT((ndo, " ripng-req dump")); 134 break; 135 } 136 if (j * sizeof(*ni) != length - 4) 137 ND_PRINT((ndo, " ripng-req %d[%u]:", j, length)); 138 else 139 ND_PRINT((ndo, " ripng-req %d:", j)); 140 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i); 141 for (ni = rp->rip6_nets; i >= sizeof(*ni); 142 i -= sizeof(*ni), ++ni) { 143 if (ndo->ndo_vflag > 1) 144 ND_PRINT((ndo, "\n\t")); 145 else 146 ND_PRINT((ndo, " ")); 147 rip6_entry_print(ndo, ni, 0); 148 } 149 break; 150 case RIP6_RESPONSE: 151 j = length / sizeof(*ni); 152 if (j * sizeof(*ni) != length - 4) 153 ND_PRINT((ndo, " ripng-resp %d[%u]:", j, length)); 154 else 155 ND_PRINT((ndo, " ripng-resp %d:", j)); 156 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i); 157 for (ni = rp->rip6_nets; i >= sizeof(*ni); 158 i -= sizeof(*ni), ++ni) { 159 if (ndo->ndo_vflag > 1) 160 ND_PRINT((ndo, "\n\t")); 161 else 162 ND_PRINT((ndo, " ")); 163 rip6_entry_print(ndo, ni, ni->rip6_metric); 164 } 165 if (trunc) 166 ND_PRINT((ndo, "[|ripng]")); 167 break; 168 default: 169 ND_PRINT((ndo, " ripng-%d ?? %u", rp->rip6_cmd, length)); 170 break; 171 } 172 if (rp->rip6_vers != RIP6_VERSION) 173 ND_PRINT((ndo, " [vers %d]", rp->rip6_vers)); 174 } 175