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 1.9 2023/08/17 20:19:40 christos Exp $"); 25 #endif 26 27 /* \summary: IPv6 Routing Information Protocol (RIPng) printer */ 28 29 /* specification: RFC 2080 */ 30 31 #ifdef HAVE_CONFIG_H 32 #include <config.h> 33 #endif 34 35 #include "netdissect-stdinc.h" 36 37 #include "netdissect.h" 38 #include "addrtoname.h" 39 #include "extract.h" 40 41 /* 42 * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project. 43 * All rights reserved. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. Neither the name of the project nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 */ 69 #define RIP6_VERSION 1 70 71 #define RIP6_REQUEST 1 72 #define RIP6_RESPONSE 2 73 74 struct netinfo6 { 75 nd_ipv6 rip6_dest; 76 nd_uint16_t rip6_tag; 77 nd_uint8_t rip6_plen; 78 nd_uint8_t rip6_metric; 79 }; 80 81 struct rip6 { 82 nd_uint8_t rip6_cmd; 83 nd_uint8_t rip6_vers; 84 nd_byte rip6_res1[2]; 85 struct netinfo6 rip6_nets[1]; 86 }; 87 88 #define HOPCNT_INFINITY6 16 89 90 static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr) 91 { 92 static const nd_ipv6 in6addr_any_val = { 0 }; /* :: */ 93 return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0); 94 } 95 96 static void 97 rip6_entry_print(netdissect_options *ndo, 98 const struct netinfo6 *ni, const u_int print_metric) 99 { 100 uint16_t tag; 101 uint8_t metric; 102 103 ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest), 104 GET_U_1(ni->rip6_plen)); 105 tag = GET_BE_U_2(ni->rip6_tag); 106 if (tag) 107 ND_PRINT(" [%u]", tag); 108 metric = GET_U_1(ni->rip6_metric); 109 if (metric && print_metric) 110 ND_PRINT(" (%u)", metric); 111 } 112 113 UNALIGNED_OK 114 void 115 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length) 116 { 117 const struct rip6 *rp = (const struct rip6 *)dat; 118 uint8_t cmd, vers; 119 const struct netinfo6 *ni; 120 unsigned int length_left; 121 u_int j; 122 123 ndo->ndo_protocol = "ripng"; 124 vers = GET_U_1(rp->rip6_vers); 125 if (vers != RIP6_VERSION) { 126 nd_print_protocol(ndo); 127 ND_PRINT(" [version %u, must be %u]", vers, RIP6_VERSION); 128 goto invalid; 129 } 130 cmd = GET_U_1(rp->rip6_cmd); 131 switch (cmd) { 132 133 case RIP6_REQUEST: 134 length_left = length; 135 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6))) 136 goto invalid; 137 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6)); 138 j = length_left / sizeof(*ni); 139 if (j == 1) { 140 if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6 141 && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) { 142 ND_PRINT(" ripng-req dump"); 143 break; 144 } 145 } 146 if (j * sizeof(*ni) != length_left) 147 ND_PRINT(" ripng-req %u[%u]:", j, length); 148 else 149 ND_PRINT(" ripng-req %u:", j); 150 for (ni = rp->rip6_nets; length_left >= sizeof(*ni); 151 length_left -= sizeof(*ni), ++ni) { 152 if (ndo->ndo_vflag > 1) 153 ND_PRINT("\n\t"); 154 else 155 ND_PRINT(" "); 156 rip6_entry_print(ndo, ni, FALSE); 157 } 158 if (length_left != 0) 159 goto invalid; 160 break; 161 case RIP6_RESPONSE: 162 length_left = length; 163 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6))) 164 goto invalid; 165 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6)); 166 j = length_left / sizeof(*ni); 167 if (j * sizeof(*ni) != length_left) 168 ND_PRINT(" ripng-resp %u[%u]:", j, length); 169 else 170 ND_PRINT(" ripng-resp %u:", j); 171 for (ni = rp->rip6_nets; length_left >= sizeof(*ni); 172 length_left -= sizeof(*ni), ++ni) { 173 if (ndo->ndo_vflag > 1) 174 ND_PRINT("\n\t"); 175 else 176 ND_PRINT(" "); 177 rip6_entry_print(ndo, ni, TRUE); 178 } 179 if (length_left != 0) 180 goto invalid; 181 break; 182 default: 183 ND_PRINT(" ripng-%u ?? %u", cmd, length); 184 goto invalid; 185 } 186 return; 187 188 invalid: 189 nd_print_invalid(ndo); 190 } 191