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 #ifdef HAVE_CONFIG_H 27 #include <config.h> 28 #endif 29 30 #include "netdissect-stdinc.h" 31 32 #include "netdissect.h" 33 #include "addrtoname.h" 34 #include "extract.h" 35 36 /* 37 * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project. 38 * All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the project nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 #define RIP6_VERSION 1 65 66 #define RIP6_REQUEST 1 67 #define RIP6_RESPONSE 2 68 69 struct netinfo6 { 70 nd_ipv6 rip6_dest; 71 nd_uint16_t rip6_tag; 72 nd_uint8_t rip6_plen; 73 nd_uint8_t rip6_metric; 74 }; 75 76 struct rip6 { 77 nd_uint8_t rip6_cmd; 78 nd_uint8_t rip6_vers; 79 nd_byte rip6_res1[2]; 80 struct netinfo6 rip6_nets[1]; 81 }; 82 83 #define HOPCNT_INFINITY6 16 84 85 static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr) 86 { 87 static const nd_ipv6 in6addr_any_val = { 0 }; /* :: */ 88 return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0); 89 } 90 91 static void 92 rip6_entry_print(netdissect_options *ndo, 93 const struct netinfo6 *ni, const u_int print_metric) 94 { 95 uint16_t tag; 96 uint8_t metric; 97 98 ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest), 99 GET_U_1(ni->rip6_plen)); 100 tag = GET_BE_U_2(ni->rip6_tag); 101 if (tag) 102 ND_PRINT(" [%u]", tag); 103 metric = GET_U_1(ni->rip6_metric); 104 if (metric && print_metric) 105 ND_PRINT(" (%u)", metric); 106 } 107 108 void 109 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length) 110 { 111 const struct rip6 *rp = (const struct rip6 *)dat; 112 uint8_t cmd, vers; 113 const struct netinfo6 *ni; 114 unsigned int length_left; 115 u_int j; 116 117 ndo->ndo_protocol = "ripng"; 118 vers = GET_U_1(rp->rip6_vers); 119 if (vers != RIP6_VERSION) { 120 ND_PRINT(" [vers %u]", vers); 121 goto invalid; 122 } 123 cmd = GET_U_1(rp->rip6_cmd); 124 switch (cmd) { 125 126 case RIP6_REQUEST: 127 length_left = length; 128 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6))) 129 goto invalid; 130 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6)); 131 j = length_left / sizeof(*ni); 132 if (j == 1) { 133 if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6 134 && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) { 135 ND_PRINT(" ripng-req dump"); 136 break; 137 } 138 } 139 if (j * sizeof(*ni) != length_left) 140 ND_PRINT(" ripng-req %u[%u]:", j, length); 141 else 142 ND_PRINT(" ripng-req %u:", j); 143 for (ni = rp->rip6_nets; length_left >= sizeof(*ni); 144 length_left -= sizeof(*ni), ++ni) { 145 if (ndo->ndo_vflag > 1) 146 ND_PRINT("\n\t"); 147 else 148 ND_PRINT(" "); 149 rip6_entry_print(ndo, ni, FALSE); 150 } 151 if (length_left != 0) 152 goto invalid; 153 break; 154 case RIP6_RESPONSE: 155 length_left = length; 156 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6))) 157 goto invalid; 158 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6)); 159 j = length_left / sizeof(*ni); 160 if (j * sizeof(*ni) != length_left) 161 ND_PRINT(" ripng-resp %u[%u]:", j, length); 162 else 163 ND_PRINT(" ripng-resp %u:", j); 164 for (ni = rp->rip6_nets; length_left >= sizeof(*ni); 165 length_left -= sizeof(*ni), ++ni) { 166 if (ndo->ndo_vflag > 1) 167 ND_PRINT("\n\t"); 168 else 169 ND_PRINT(" "); 170 rip6_entry_print(ndo, ni, TRUE); 171 } 172 if (length_left != 0) 173 goto invalid; 174 break; 175 default: 176 ND_PRINT(" ripng-%u ?? %u", cmd, length); 177 goto invalid; 178 } 179 return; 180 181 invalid: 182 nd_print_invalid(ndo); 183 } 184