1 /* 2 * Copyright (c) 1998-2007 The TCPDUMP project 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that: (1) source code 6 * distributions retain the above copyright notice and this paragraph 7 * in its entirety, and (2) distributions including binary code include 8 * the above copyright notice and this paragraph in its entirety in 9 * the documentation or other materials provided with the distribution. 10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND 11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 13 * FOR A PARTICULAR PURPOSE. 14 * 15 * Reference documentation: 16 * http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml 17 * http://www.cisco.com/warp/public/473/21.html 18 * http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm 19 * 20 * Original code ode by Carles Kishimoto <carles.kishimoto@gmail.com> 21 */ 22 23 #include <sys/cdefs.h> 24 #ifndef lint 25 __RCSID("$NetBSD: print-vtp.c,v 1.3 2017/02/05 04:05:05 spz Exp $"); 26 #endif 27 28 /* \summary: Cisco VLAN Trunking Protocol (VTP) printer */ 29 30 #ifdef HAVE_CONFIG_H 31 #include "config.h" 32 #endif 33 34 #include <netdissect-stdinc.h> 35 36 #include "netdissect.h" 37 #include "addrtoname.h" 38 #include "extract.h" 39 40 #define VTP_HEADER_LEN 36 41 #define VTP_DOMAIN_NAME_LEN 32 42 #define VTP_MD5_DIGEST_LEN 16 43 #define VTP_UPDATE_TIMESTAMP_LEN 12 44 #define VTP_VLAN_INFO_OFFSET 12 45 46 #define VTP_SUMMARY_ADV 0x01 47 #define VTP_SUBSET_ADV 0x02 48 #define VTP_ADV_REQUEST 0x03 49 #define VTP_JOIN_MESSAGE 0x04 50 51 struct vtp_vlan_ { 52 uint8_t len; 53 uint8_t status; 54 uint8_t type; 55 uint8_t name_len; 56 uint16_t vlanid; 57 uint16_t mtu; 58 uint32_t index; 59 }; 60 61 static const struct tok vtp_message_type_values[] = { 62 { VTP_SUMMARY_ADV, "Summary advertisement"}, 63 { VTP_SUBSET_ADV, "Subset advertisement"}, 64 { VTP_ADV_REQUEST, "Advertisement request"}, 65 { VTP_JOIN_MESSAGE, "Join message"}, 66 { 0, NULL } 67 }; 68 69 static const struct tok vtp_header_values[] = { 70 { 0x01, "Followers"}, /* On Summary advertisement, 3rd byte is Followers */ 71 { 0x02, "Seq number"}, /* On Subset advertisement, 3rd byte is Sequence number */ 72 { 0x03, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */ 73 { 0x04, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */ 74 { 0, NULL } 75 }; 76 77 static const struct tok vtp_vlan_type_values[] = { 78 { 0x01, "Ethernet"}, 79 { 0x02, "FDDI"}, 80 { 0x03, "TrCRF"}, 81 { 0x04, "FDDI-net"}, 82 { 0x05, "TrBRF"}, 83 { 0, NULL } 84 }; 85 86 static const struct tok vtp_vlan_status[] = { 87 { 0x00, "Operational"}, 88 { 0x01, "Suspended"}, 89 { 0, NULL } 90 }; 91 92 #define VTP_VLAN_SOURCE_ROUTING_RING_NUMBER 0x01 93 #define VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER 0x02 94 #define VTP_VLAN_STP_TYPE 0x03 95 #define VTP_VLAN_PARENT_VLAN 0x04 96 #define VTP_VLAN_TRANS_BRIDGED_VLAN 0x05 97 #define VTP_VLAN_PRUNING 0x06 98 #define VTP_VLAN_BRIDGE_TYPE 0x07 99 #define VTP_VLAN_ARP_HOP_COUNT 0x08 100 #define VTP_VLAN_STE_HOP_COUNT 0x09 101 #define VTP_VLAN_BACKUP_CRF_MODE 0x0A 102 103 static const struct tok vtp_vlan_tlv_values[] = { 104 { VTP_VLAN_SOURCE_ROUTING_RING_NUMBER, "Source-Routing Ring Number TLV"}, 105 { VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER, "Source-Routing Bridge Number TLV"}, 106 { VTP_VLAN_STP_TYPE, "STP type TLV"}, 107 { VTP_VLAN_PARENT_VLAN, "Parent VLAN TLV"}, 108 { VTP_VLAN_TRANS_BRIDGED_VLAN, "Translationally bridged VLANs TLV"}, 109 { VTP_VLAN_PRUNING, "Pruning TLV"}, 110 { VTP_VLAN_BRIDGE_TYPE, "Bridge Type TLV"}, 111 { VTP_VLAN_ARP_HOP_COUNT, "Max ARP Hop Count TLV"}, 112 { VTP_VLAN_STE_HOP_COUNT, "Max STE Hop Count TLV"}, 113 { VTP_VLAN_BACKUP_CRF_MODE, "Backup CRF Mode TLV"}, 114 { 0, NULL } 115 }; 116 117 static const struct tok vtp_stp_type_values[] = { 118 { 1, "SRT"}, 119 { 2, "SRB"}, 120 { 3, "Auto"}, 121 { 0, NULL } 122 }; 123 124 void 125 vtp_print (netdissect_options *ndo, 126 const u_char *pptr, u_int length) 127 { 128 int type, len, tlv_len, tlv_value, mgmtd_len; 129 const u_char *tptr; 130 const struct vtp_vlan_ *vtp_vlan; 131 132 if (length < VTP_HEADER_LEN) 133 goto trunc; 134 135 tptr = pptr; 136 137 ND_TCHECK2(*tptr, VTP_HEADER_LEN); 138 139 type = *(tptr+1); 140 ND_PRINT((ndo, "VTPv%u, Message %s (0x%02x), length %u", 141 *tptr, 142 tok2str(vtp_message_type_values,"Unknown message type", type), 143 type, 144 length)); 145 146 /* In non-verbose mode, just print version and message type */ 147 if (ndo->ndo_vflag < 1) { 148 return; 149 } 150 151 /* verbose mode print all fields */ 152 ND_PRINT((ndo, "\n\tDomain name: ")); 153 mgmtd_len = *(tptr + 3); 154 if (mgmtd_len < 1 || mgmtd_len > 32) { 155 ND_PRINT((ndo, " [invalid MgmtD Len %d]", mgmtd_len)); 156 return; 157 } 158 fn_printzp(ndo, tptr + 4, mgmtd_len, NULL); 159 ND_PRINT((ndo, ", %s: %u", 160 tok2str(vtp_header_values, "Unknown", type), 161 *(tptr+2))); 162 163 tptr += VTP_HEADER_LEN; 164 165 switch (type) { 166 167 case VTP_SUMMARY_ADV: 168 169 /* 170 * SUMMARY ADVERTISEMENT 171 * 172 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 173 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 174 * | Version | Code | Followers | MgmtD Len | 175 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 176 * | Management Domain Name (zero-padded to 32 bytes) | 177 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 178 * | Configuration revision number | 179 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 180 * | Updater Identity IP address | 181 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 182 * | Update Timestamp (12 bytes) | 183 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 184 * | MD5 digest (16 bytes) | 185 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 186 * 187 */ 188 189 ND_TCHECK2(*tptr, 8); 190 ND_PRINT((ndo, "\n\t Config Rev %x, Updater %s", 191 EXTRACT_32BITS(tptr), 192 ipaddr_string(ndo, tptr+4))); 193 tptr += 8; 194 ND_TCHECK2(*tptr, VTP_UPDATE_TIMESTAMP_LEN); 195 ND_PRINT((ndo, ", Timestamp 0x%08x 0x%08x 0x%08x", 196 EXTRACT_32BITS(tptr), 197 EXTRACT_32BITS(tptr + 4), 198 EXTRACT_32BITS(tptr + 8))); 199 tptr += VTP_UPDATE_TIMESTAMP_LEN; 200 ND_TCHECK2(*tptr, VTP_MD5_DIGEST_LEN); 201 ND_PRINT((ndo, ", MD5 digest: %08x%08x%08x%08x", 202 EXTRACT_32BITS(tptr), 203 EXTRACT_32BITS(tptr + 4), 204 EXTRACT_32BITS(tptr + 8), 205 EXTRACT_32BITS(tptr + 12))); 206 tptr += VTP_MD5_DIGEST_LEN; 207 break; 208 209 case VTP_SUBSET_ADV: 210 211 /* 212 * SUBSET ADVERTISEMENT 213 * 214 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 215 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 216 * | Version | Code | Seq number | MgmtD Len | 217 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 218 * | Management Domain Name (zero-padded to 32 bytes) | 219 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 220 * | Configuration revision number | 221 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 222 * | VLAN info field 1 | 223 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 224 * | ................ | 225 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 226 * | VLAN info field N | 227 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 228 * 229 */ 230 231 ND_PRINT((ndo, ", Config Rev %x", EXTRACT_32BITS(tptr))); 232 233 /* 234 * VLAN INFORMATION 235 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 236 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 237 * | V info len | Status | VLAN type | VLAN name len | 238 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 239 * | ISL vlan id | MTU size | 240 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 241 * | 802.10 index (SAID) | 242 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 243 * | VLAN name | 244 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 245 * 246 */ 247 248 tptr += 4; 249 while (tptr < (pptr+length)) { 250 251 len = *tptr; 252 if (len == 0) 253 break; 254 255 ND_TCHECK2(*tptr, len); 256 257 vtp_vlan = (const struct vtp_vlan_*)tptr; 258 ND_TCHECK(*vtp_vlan); 259 ND_PRINT((ndo, "\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name ", 260 tok2str(vtp_vlan_status,"Unknown",vtp_vlan->status), 261 tok2str(vtp_vlan_type_values,"Unknown",vtp_vlan->type), 262 EXTRACT_16BITS(&vtp_vlan->vlanid), 263 EXTRACT_16BITS(&vtp_vlan->mtu), 264 EXTRACT_32BITS(&vtp_vlan->index))); 265 fn_printzp(ndo, tptr + VTP_VLAN_INFO_OFFSET, vtp_vlan->name_len, NULL); 266 267 /* 268 * Vlan names are aligned to 32-bit boundaries. 269 */ 270 len -= VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4); 271 tptr += VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4); 272 273 /* TLV information follows */ 274 275 while (len > 0) { 276 277 /* 278 * Cisco specs says 2 bytes for type + 2 bytes for length, take only 1 279 * See: http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm 280 */ 281 type = *tptr; 282 tlv_len = *(tptr+1); 283 284 ND_PRINT((ndo, "\n\t\t%s (0x%04x) TLV", 285 tok2str(vtp_vlan_tlv_values, "Unknown", type), 286 type)); 287 288 /* 289 * infinite loop check 290 */ 291 if (type == 0 || tlv_len == 0) { 292 return; 293 } 294 295 ND_TCHECK2(*tptr, tlv_len * 2 +2); 296 297 tlv_value = EXTRACT_16BITS(tptr+2); 298 299 switch (type) { 300 case VTP_VLAN_STE_HOP_COUNT: 301 ND_PRINT((ndo, ", %u", tlv_value)); 302 break; 303 304 case VTP_VLAN_PRUNING: 305 ND_PRINT((ndo, ", %s (%u)", 306 tlv_value == 1 ? "Enabled" : "Disabled", 307 tlv_value)); 308 break; 309 310 case VTP_VLAN_STP_TYPE: 311 ND_PRINT((ndo, ", %s (%u)", 312 tok2str(vtp_stp_type_values, "Unknown", tlv_value), 313 tlv_value)); 314 break; 315 316 case VTP_VLAN_BRIDGE_TYPE: 317 ND_PRINT((ndo, ", %s (%u)", 318 tlv_value == 1 ? "SRB" : "SRT", 319 tlv_value)); 320 break; 321 322 case VTP_VLAN_BACKUP_CRF_MODE: 323 ND_PRINT((ndo, ", %s (%u)", 324 tlv_value == 1 ? "Backup" : "Not backup", 325 tlv_value)); 326 break; 327 328 /* 329 * FIXME those are the defined TLVs that lack a decoder 330 * you are welcome to contribute code ;-) 331 */ 332 333 case VTP_VLAN_SOURCE_ROUTING_RING_NUMBER: 334 case VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER: 335 case VTP_VLAN_PARENT_VLAN: 336 case VTP_VLAN_TRANS_BRIDGED_VLAN: 337 case VTP_VLAN_ARP_HOP_COUNT: 338 default: 339 print_unknown_data(ndo, tptr, "\n\t\t ", 2 + tlv_len*2); 340 break; 341 } 342 len -= 2 + tlv_len*2; 343 tptr += 2 + tlv_len*2; 344 } 345 } 346 break; 347 348 case VTP_ADV_REQUEST: 349 350 /* 351 * ADVERTISEMENT REQUEST 352 * 353 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 354 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 355 * | Version | Code | Reserved | MgmtD Len | 356 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 357 * | Management Domain Name (zero-padded to 32 bytes) | 358 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 359 * | Start value | 360 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 361 * 362 */ 363 364 ND_TCHECK2(*tptr, 4); 365 ND_PRINT((ndo, "\n\tStart value: %u", EXTRACT_32BITS(tptr))); 366 break; 367 368 case VTP_JOIN_MESSAGE: 369 370 /* FIXME - Could not find message format */ 371 break; 372 373 default: 374 break; 375 } 376 377 return; 378 379 trunc: 380 ND_PRINT((ndo, "[|vtp]")); 381 } 382 383 /* 384 * Local Variables: 385 * c-style: whitesmith 386 * c-basic-offset: 4 387 * End: 388 */ 389