1 /* 2 * Copyright (c) 2015 Ritesh Ranjan (r.ranjan789@gmail.com) 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 25 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* \summary: - Locator/Identifier Separation Protocol (LISP) printer */ 30 31 /* 32 * specification: RFC 6830 33 * 34 * 35 * The Map-Register message format is: 36 * 37 * 0 1 2 3 38 * 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 39 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 40 * |Type=3 |P|S|I|R| Reserved |M| Record Count | 41 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 42 * | Nonce . . . | 43 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 44 * | . . . Nonce | 45 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 46 * | Key ID | Authentication Data Length | 47 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 48 * ~ Authentication Data ~ 49 * +-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 50 * | | Record TTL | 51 * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 52 * R | Locator Count | EID mask-len | ACT |A| Reserved | 53 * e +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 54 * c | Rsvd | Map-Version Number | EID-Prefix-AFI | 55 * o +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 56 * r | EID-Prefix | 57 * d +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 58 * | /| Priority | Weight | M Priority | M Weight | 59 * | L +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 60 * | o | Unused Flags |L|p|R| Loc-AFI | 61 * | c +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 62 * | \| Locator | 63 * +-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 64 * 65 * 66 * The Map-Notify message format is: 67 * 68 * 0 1 2 3 69 * 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 70 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 71 * |Type=4 |I|R| Reserved | Record Count | 72 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 73 * | Nonce . . . | 74 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 75 * | . . . Nonce | 76 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 77 * | Key ID | Authentication Data Length | 78 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 79 * ~ Authentication Data ~ 80 * +-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 81 * | | Record TTL | 82 * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 83 * R | Locator Count | EID mask-len | ACT |A| Reserved | 84 * e +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 85 * c | Rsvd | Map-Version Number | EID-Prefix-AFI | 86 * o +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 87 * r | EID-Prefix | 88 * d +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 89 * | /| Priority | Weight | M Priority | M Weight | 90 * | L +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 91 * | o | Unused Flags |L|p|R| Loc-AFI | 92 * | c +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 93 * | \| Locator | 94 * +-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 95 */ 96 97 #ifdef HAVE_CONFIG_H 98 #include <config.h> 99 #endif 100 101 #include "netdissect-stdinc.h" 102 #include "netdissect.h" 103 104 #include "ip.h" 105 #include "ip6.h" 106 107 #include "extract.h" 108 #include "addrtoname.h" 109 110 111 #define IPv4_AFI 1 112 #define IPv6_AFI 2 113 #define TYPE_INDEX 4 114 #define LISP_MAP_NOTIFY_IBIT_MASK 8 115 #define LISP_MAP_REGISTER_IBIT_MASK 2 116 117 enum { 118 LISP_MAP_REQUEST = 1, 119 LISP_MAP_REPLY, 120 LISP_MAP_REGISTER, 121 LISP_MAP_NOTIFY, 122 LISP_ENCAPSULATED_CONTROL_MESSAGE = 8 123 }; 124 125 enum { 126 LISP_AUTH_NONE, 127 LISP_AUTH_SHA1, 128 LISP_AUTH_SHA256 129 }; 130 131 static const struct tok lisp_type [] = { 132 { 0, "LISP-Reserved" }, 133 { 1, "LISP-Map-Request" }, 134 { 2, "LISP-Map-Reply" }, 135 { 3, "LISP-Map-Register" }, 136 { 4, "LISP-Map-Notify" }, 137 { 8, "LISP-Encapsulated-Contol-Message" }, 138 { 0, NULL } 139 }; 140 141 /* 142 * P-Bit : Request for Proxy Map-Reply from the MS/MR 143 * S-Bit : Security Enhancement. ETR is LISP-SEC enabled. draft-ietf-lisp-sec 144 * I-Bit : 128 bit xTR-ID and 64 bit Site-ID present. 145 * xTR-ID and Site-ID help in differentiation of xTRs in multi xTR 146 * and multi Site deployment scenarios. 147 * R-Bit : Built for a Reencapsulating-Tunnel-Router. Used in Traffic 148 * Engineering and Service Chaining 149 */ 150 static const struct tok map_register_hdr_flag[] = { 151 { 0x08000000, "P-Proxy-Map-Reply" }, 152 { 0x04000000, "S-LISP-SEC-Capable" }, 153 { 0x02000000, "I-xTR-ID-Present" }, 154 { 0x01000000, "R-Build-For-RTR" }, 155 { 0x00000100, "M-Want-Map-Notify" }, 156 { 0, NULL } 157 }; 158 159 static const struct tok map_notify_hdr_flag[] = { 160 { 0x08000000, "I-xTR-ID-Present" }, 161 { 0x04000000, "R-Build-For-RTR" }, 162 { 0, NULL } 163 }; 164 165 static const struct tok auth_type[] = { 166 { LISP_AUTH_NONE, "None" }, 167 { LISP_AUTH_SHA1, "SHA1" }, 168 { LISP_AUTH_SHA256, "SHA256" }, 169 { 0, NULL} 170 }; 171 172 static const struct tok lisp_eid_action[] = { 173 { 0, "No-Action" }, 174 { 1, "Natively-Forward" }, 175 { 2, "Send-Map-Request" }, 176 { 3, "Drop" }, 177 { 0, NULL} 178 }; 179 180 static const struct tok lisp_loc_flag[] = { 181 { 0x0004, "Local-Locator" }, 182 { 0x0002, "RLoc-Probed" }, 183 { 0x0001, "Reachable" }, 184 { 0, NULL } 185 }; 186 187 typedef struct map_register_hdr { 188 nd_uint8_t type_and_flag; 189 nd_uint8_t reserved; 190 nd_uint8_t reserved_and_flag2; 191 nd_uint8_t record_count; 192 nd_uint64_t nonce; 193 nd_uint16_t key_id; 194 nd_uint16_t auth_data_len; 195 } lisp_map_register_hdr; 196 197 #define MAP_REGISTER_HDR_LEN sizeof(lisp_map_register_hdr) 198 199 typedef struct map_register_eid { 200 nd_uint32_t ttl; 201 nd_uint8_t locator_count; 202 nd_uint8_t eid_prefix_mask_length; 203 nd_uint8_t act_auth_inc_res; 204 nd_uint8_t reserved; 205 nd_uint16_t reserved_and_version; 206 nd_uint16_t eid_prefix_afi; 207 } lisp_map_register_eid; 208 209 #define MAP_REGISTER_EID_LEN sizeof(lisp_map_register_eid) 210 211 typedef struct map_register_loc { 212 nd_uint8_t priority; 213 nd_uint8_t weight; 214 nd_uint8_t m_priority; 215 nd_uint8_t m_weight; 216 nd_uint16_t unused_and_flag; 217 nd_uint16_t locator_afi; 218 } lisp_map_register_loc; 219 220 #define MAP_REGISTER_LOC_LEN sizeof(lisp_map_register_loc) 221 222 static uint8_t extract_lisp_type(uint8_t); 223 static uint8_t is_xtr_data_present(uint8_t, uint8_t); 224 static void lisp_hdr_flag(netdissect_options *, const lisp_map_register_hdr *); 225 static void action_flag(netdissect_options *, uint8_t); 226 static void loc_hdr_flag(netdissect_options *, uint16_t); 227 228 void 229 lisp_print(netdissect_options *ndo, const u_char *bp, u_int length) 230 { 231 uint8_t type_and_flag; 232 uint8_t type; 233 uint8_t mask_len; 234 uint8_t loc_count; 235 uint8_t xtr_present; 236 uint8_t record_count; 237 uint16_t key_id; 238 uint16_t eid_afi; 239 uint16_t loc_afi; 240 uint16_t map_version; 241 uint16_t packet_offset; 242 uint16_t auth_data_len; 243 uint32_t ttl; 244 const u_char *packet_iterator; 245 const u_char *loc_ip_pointer; 246 const lisp_map_register_hdr *lisp_hdr; 247 const lisp_map_register_eid *lisp_eid; 248 const lisp_map_register_loc *lisp_loc; 249 250 ndo->ndo_protocol = "lisp"; 251 /* Check if enough bytes for header are available */ 252 ND_TCHECK_LEN(bp, MAP_REGISTER_HDR_LEN); 253 lisp_hdr = (const lisp_map_register_hdr *) bp; 254 lisp_hdr_flag(ndo, lisp_hdr); 255 /* Supporting only MAP NOTIFY and MAP REGISTER LISP packets */ 256 type_and_flag = GET_U_1(lisp_hdr->type_and_flag); 257 type = extract_lisp_type(type_and_flag); 258 if ((type != LISP_MAP_REGISTER) && (type != LISP_MAP_NOTIFY)) 259 return; 260 261 /* Find if the packet contains xTR and Site-ID data */ 262 xtr_present = is_xtr_data_present(type, type_and_flag); 263 264 /* Extract the number of EID records present */ 265 auth_data_len = GET_BE_U_2(lisp_hdr->auth_data_len); 266 packet_iterator = (const u_char *)(lisp_hdr); 267 packet_offset = MAP_REGISTER_HDR_LEN; 268 record_count = GET_U_1(lisp_hdr->record_count); 269 270 if (ndo->ndo_vflag) { 271 key_id = GET_BE_U_2(lisp_hdr->key_id); 272 ND_PRINT("\n %u record(s), ", record_count); 273 ND_PRINT("Authentication %s,", 274 tok2str(auth_type, "unknown-type", key_id)); 275 hex_print(ndo, "\n Authentication-Data: ", packet_iterator + 276 packet_offset, auth_data_len); 277 } else { 278 ND_PRINT(" %u record(s),", record_count); 279 } 280 packet_offset += auth_data_len; 281 282 if (record_count == 0) 283 goto invalid; 284 285 /* Print all the EID records */ 286 while ((length > packet_offset) && (record_count--)) { 287 288 ND_TCHECK_LEN(packet_iterator + packet_offset, 289 MAP_REGISTER_EID_LEN); 290 ND_PRINT("\n"); 291 lisp_eid = (const lisp_map_register_eid *) 292 ((const u_char *)lisp_hdr + packet_offset); 293 packet_offset += MAP_REGISTER_EID_LEN; 294 mask_len = GET_U_1(lisp_eid->eid_prefix_mask_length); 295 eid_afi = GET_BE_U_2(lisp_eid->eid_prefix_afi); 296 loc_count = GET_U_1(lisp_eid->locator_count); 297 298 if (ndo->ndo_vflag) { 299 ttl = GET_BE_U_4(lisp_eid->ttl); 300 ND_PRINT(" Record TTL %u,", ttl); 301 action_flag(ndo, GET_U_1(lisp_eid->act_auth_inc_res)); 302 map_version = GET_BE_U_2(lisp_eid->reserved_and_version) & 0x0FFF; 303 ND_PRINT(" Map Version: %u,", map_version); 304 } 305 306 switch (eid_afi) { 307 case IPv4_AFI: 308 ND_PRINT(" EID %s/%u,", 309 GET_IPADDR_STRING(packet_iterator + packet_offset), 310 mask_len); 311 packet_offset += 4; 312 break; 313 case IPv6_AFI: 314 ND_PRINT(" EID %s/%u,", 315 GET_IP6ADDR_STRING(packet_iterator + packet_offset), 316 mask_len); 317 packet_offset += 16; 318 break; 319 default: 320 /* 321 * No support for LCAF right now. 322 */ 323 return; 324 break; 325 } 326 327 ND_PRINT(" %u locator(s)", loc_count); 328 329 while (loc_count--) { 330 ND_TCHECK_LEN(packet_iterator + packet_offset, 331 MAP_REGISTER_LOC_LEN); 332 lisp_loc = (const lisp_map_register_loc *) (packet_iterator + packet_offset); 333 loc_ip_pointer = (const u_char *) (lisp_loc + 1); 334 packet_offset += MAP_REGISTER_LOC_LEN; 335 loc_afi = GET_BE_U_2(lisp_loc->locator_afi); 336 337 if (ndo->ndo_vflag) 338 ND_PRINT("\n "); 339 340 switch (loc_afi) { 341 case IPv4_AFI: 342 ND_TCHECK_4(packet_iterator + packet_offset); 343 ND_PRINT(" LOC %s", GET_IPADDR_STRING(loc_ip_pointer)); 344 packet_offset += 4; 345 break; 346 case IPv6_AFI: 347 ND_TCHECK_16(packet_iterator + packet_offset); 348 ND_PRINT(" LOC %s", GET_IP6ADDR_STRING(loc_ip_pointer)); 349 packet_offset += 16; 350 break; 351 default: 352 break; 353 } 354 if (ndo->ndo_vflag) { 355 ND_PRINT("\n Priority/Weight %u/%u," 356 " Multicast Priority/Weight %u/%u,", 357 GET_U_1(lisp_loc->priority), 358 GET_U_1(lisp_loc->weight), 359 GET_U_1(lisp_loc->m_priority), 360 GET_U_1(lisp_loc->m_weight)); 361 loc_hdr_flag(ndo, 362 GET_BE_U_2(lisp_loc->unused_and_flag)); 363 } 364 } 365 } 366 367 /* 368 * Print xTR and Site ID. Handle the fact that the packet could be invalid. 369 * If the xTR_ID_Present bit is not set, and we still have data to display, 370 * show it as hex data. 371 */ 372 if (xtr_present) { 373 if (!ND_TTEST_LEN(packet_iterator + packet_offset, 24)) 374 goto invalid; 375 hex_print(ndo, "\n xTR-ID: ", packet_iterator + packet_offset, 16); 376 ND_PRINT("\n SITE-ID: %" PRIu64, 377 GET_BE_U_8(packet_iterator + packet_offset + 16)); 378 } else { 379 /* Check if packet isn't over yet */ 380 if (packet_iterator + packet_offset < ndo->ndo_snapend) { 381 hex_print(ndo, "\n Data: ", packet_iterator + packet_offset, 382 ND_BYTES_AVAILABLE_AFTER(packet_iterator + packet_offset)); 383 } 384 } 385 return; 386 trunc: 387 nd_print_trunc(ndo); 388 return; 389 invalid: 390 nd_print_invalid(ndo); 391 } 392 393 static uint8_t 394 extract_lisp_type(uint8_t lisp_hdr_flags) 395 { 396 return (lisp_hdr_flags) >> TYPE_INDEX; 397 } 398 399 static uint8_t 400 is_xtr_data_present(uint8_t type, uint8_t lisp_hdr_flags) 401 { 402 uint8_t xtr_present = 0; 403 404 if (type == LISP_MAP_REGISTER) 405 xtr_present = (lisp_hdr_flags) & LISP_MAP_REGISTER_IBIT_MASK; 406 else if (type == LISP_MAP_NOTIFY) 407 xtr_present = (lisp_hdr_flags) & LISP_MAP_NOTIFY_IBIT_MASK; 408 409 return xtr_present; 410 } 411 412 static void lisp_hdr_flag(netdissect_options *ndo, const lisp_map_register_hdr *lisp_hdr) 413 { 414 uint8_t type = extract_lisp_type(GET_U_1(lisp_hdr->type_and_flag)); 415 416 if (!ndo->ndo_vflag) { 417 ND_PRINT("%s,", tok2str(lisp_type, "unknown-type-%u", type)); 418 return; 419 } else { 420 ND_PRINT("%s,", tok2str(lisp_type, "unknown-type-%u", type)); 421 } 422 423 if (type == LISP_MAP_REGISTER) { 424 ND_PRINT(" flags [%s],", bittok2str(map_register_hdr_flag, 425 "none", GET_BE_U_4(lisp_hdr))); 426 } else if (type == LISP_MAP_NOTIFY) { 427 ND_PRINT(" flags [%s],", bittok2str(map_notify_hdr_flag, 428 "none", GET_BE_U_4(lisp_hdr))); 429 } 430 } 431 432 static void action_flag(netdissect_options *ndo, uint8_t act_auth_inc_res) 433 { 434 uint8_t action; 435 uint8_t authoritative; 436 437 authoritative = ((act_auth_inc_res >> 4) & 1); 438 439 if (authoritative) 440 ND_PRINT(" Authoritative,"); 441 else 442 ND_PRINT(" Non-Authoritative,"); 443 444 action = act_auth_inc_res >> 5; 445 ND_PRINT(" %s,", tok2str(lisp_eid_action, "unknown", action)); 446 } 447 448 static void loc_hdr_flag(netdissect_options *ndo, uint16_t flag) 449 { 450 ND_PRINT(" flags [%s],", bittok2str(lisp_loc_flag, "none", flag)); 451 } 452 453