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 #include <config.h> 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 struct netinfo6 rip6_nets[1]; 79 }; 80 81 #define HOPCNT_INFINITY6 16 82 83 static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr) 84 { 85 static const nd_ipv6 in6addr_any_val = { 0 }; /* :: */ 86 return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0); 87 } 88 89 static void 90 rip6_entry_print(netdissect_options *ndo, 91 const struct netinfo6 *ni, const u_int print_metric) 92 { 93 uint16_t tag; 94 uint8_t metric; 95 96 ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest), 97 GET_U_1(ni->rip6_plen)); 98 tag = GET_BE_U_2(ni->rip6_tag); 99 if (tag) 100 ND_PRINT(" [%u]", tag); 101 metric = GET_U_1(ni->rip6_metric); 102 if (metric && print_metric) 103 ND_PRINT(" (%u)", metric); 104 } 105 106 void 107 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length) 108 { 109 const struct rip6 *rp = (const struct rip6 *)dat; 110 uint8_t cmd, vers; 111 const struct netinfo6 *ni; 112 unsigned int length_left; 113 u_int j; 114 115 ndo->ndo_protocol = "ripng"; 116 vers = GET_U_1(rp->rip6_vers); 117 if (vers != RIP6_VERSION) { 118 nd_print_protocol(ndo); 119 ND_PRINT(" [version %u, must be %u]", vers, RIP6_VERSION); 120 goto invalid; 121 } 122 cmd = GET_U_1(rp->rip6_cmd); 123 switch (cmd) { 124 125 case RIP6_REQUEST: 126 length_left = length; 127 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6))) 128 goto invalid; 129 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6)); 130 j = length_left / sizeof(*ni); 131 if (j == 1) { 132 if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6 133 && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) { 134 ND_PRINT(" ripng-req dump"); 135 break; 136 } 137 } 138 if (j * sizeof(*ni) != length_left) 139 ND_PRINT(" ripng-req %u[%u]:", j, length); 140 else 141 ND_PRINT(" ripng-req %u:", j); 142 for (ni = rp->rip6_nets; length_left >= sizeof(*ni); 143 length_left -= sizeof(*ni), ++ni) { 144 if (ndo->ndo_vflag > 1) 145 ND_PRINT("\n\t"); 146 else 147 ND_PRINT(" "); 148 rip6_entry_print(ndo, ni, FALSE); 149 } 150 if (length_left != 0) 151 goto invalid; 152 break; 153 case RIP6_RESPONSE: 154 length_left = length; 155 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6))) 156 goto invalid; 157 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6)); 158 j = length_left / sizeof(*ni); 159 if (j * sizeof(*ni) != length_left) 160 ND_PRINT(" ripng-resp %u[%u]:", j, length); 161 else 162 ND_PRINT(" ripng-resp %u:", j); 163 for (ni = rp->rip6_nets; length_left >= sizeof(*ni); 164 length_left -= sizeof(*ni), ++ni) { 165 if (ndo->ndo_vflag > 1) 166 ND_PRINT("\n\t"); 167 else 168 ND_PRINT(" "); 169 rip6_entry_print(ndo, ni, TRUE); 170 } 171 if (length_left != 0) 172 goto invalid; 173 break; 174 default: 175 ND_PRINT(" ripng-%u ?? %u", cmd, length); 176 goto invalid; 177 } 178 return; 179 180 invalid: 181 nd_print_invalid(ndo); 182 } 183