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 1.10 2024/09/02 16:15:32 christos Exp $"); 25 #endif 26 27 /* \summary: IPv6 Routing Information Protocol (RIPng) printer */ 28 29 /* specification: RFC 2080 */ 30 31 #include <config.h> 32 33 #include "netdissect-stdinc.h" 34 35 #include "netdissect.h" 36 #include "addrtoname.h" 37 #include "extract.h" 38 39 /* 40 * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. Neither the name of the project nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 */ 67 #define RIP6_VERSION 1 68 69 #define RIP6_REQUEST 1 70 #define RIP6_RESPONSE 2 71 72 struct netinfo6 { 73 nd_ipv6 rip6_dest; 74 nd_uint16_t rip6_tag; 75 nd_uint8_t rip6_plen; 76 nd_uint8_t rip6_metric; 77 }; 78 79 struct rip6 { 80 nd_uint8_t rip6_cmd; 81 nd_uint8_t rip6_vers; 82 nd_byte rip6_res1[2]; 83 struct netinfo6 rip6_nets[1]; 84 }; 85 86 #define HOPCNT_INFINITY6 16 87 88 static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr) 89 { 90 static const nd_ipv6 in6addr_any_val = { 0 }; /* :: */ 91 return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0); 92 } 93 94 static void 95 rip6_entry_print(netdissect_options *ndo, 96 const struct netinfo6 *ni, const u_int print_metric) 97 { 98 uint16_t tag; 99 uint8_t metric; 100 101 ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest), 102 GET_U_1(ni->rip6_plen)); 103 tag = GET_BE_U_2(ni->rip6_tag); 104 if (tag) 105 ND_PRINT(" [%u]", tag); 106 metric = GET_U_1(ni->rip6_metric); 107 if (metric && print_metric) 108 ND_PRINT(" (%u)", metric); 109 } 110 111 UNALIGNED_OK 112 void 113 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length) 114 { 115 const struct rip6 *rp = (const struct rip6 *)dat; 116 uint8_t cmd, vers; 117 const struct netinfo6 *ni; 118 unsigned int length_left; 119 u_int j; 120 121 ndo->ndo_protocol = "ripng"; 122 vers = GET_U_1(rp->rip6_vers); 123 if (vers != RIP6_VERSION) { 124 nd_print_protocol(ndo); 125 ND_PRINT(" [version %u, must be %u]", vers, RIP6_VERSION); 126 goto invalid; 127 } 128 cmd = GET_U_1(rp->rip6_cmd); 129 switch (cmd) { 130 131 case RIP6_REQUEST: 132 length_left = length; 133 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6))) 134 goto invalid; 135 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6)); 136 j = length_left / sizeof(*ni); 137 if (j == 1) { 138 if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6 139 && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) { 140 ND_PRINT(" ripng-req dump"); 141 break; 142 } 143 } 144 if (j * sizeof(*ni) != length_left) 145 ND_PRINT(" ripng-req %u[%u]:", j, length); 146 else 147 ND_PRINT(" ripng-req %u:", j); 148 for (ni = rp->rip6_nets; length_left >= sizeof(*ni); 149 length_left -= sizeof(*ni), ++ni) { 150 if (ndo->ndo_vflag > 1) 151 ND_PRINT("\n\t"); 152 else 153 ND_PRINT(" "); 154 rip6_entry_print(ndo, ni, FALSE); 155 } 156 if (length_left != 0) 157 goto invalid; 158 break; 159 case RIP6_RESPONSE: 160 length_left = length; 161 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6))) 162 goto invalid; 163 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6)); 164 j = length_left / sizeof(*ni); 165 if (j * sizeof(*ni) != length_left) 166 ND_PRINT(" ripng-resp %u[%u]:", j, length); 167 else 168 ND_PRINT(" ripng-resp %u:", j); 169 for (ni = rp->rip6_nets; length_left >= sizeof(*ni); 170 length_left -= sizeof(*ni), ++ni) { 171 if (ndo->ndo_vflag > 1) 172 ND_PRINT("\n\t"); 173 else 174 ND_PRINT(" "); 175 rip6_entry_print(ndo, ni, TRUE); 176 } 177 if (length_left != 0) 178 goto invalid; 179 break; 180 default: 181 ND_PRINT(" ripng-%u ?? %u", cmd, length); 182 goto invalid; 183 } 184 return; 185 186 invalid: 187 nd_print_invalid(ndo); 188 } 189