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 #include <sys/cdefs.h> 98 #ifndef lint 99 __RCSID("$NetBSD: print-lisp.c,v 1.4 2023/08/17 20:19:40 christos Exp $"); 100 #endif 101 102 #ifdef HAVE_CONFIG_H 103 #include <config.h> 104 #endif 105 106 #include "netdissect-stdinc.h" 107 #include "netdissect.h" 108 109 #include "ip.h" 110 #include "ip6.h" 111 112 #include "extract.h" 113 #include "addrtoname.h" 114 115 116 #define IPv4_AFI 1 117 #define IPv6_AFI 2 118 #define TYPE_INDEX 4 119 #define LISP_MAP_NOTIFY_IBIT_MASK 8 120 #define LISP_MAP_REGISTER_IBIT_MASK 2 121 122 enum { 123 LISP_MAP_REQUEST = 1, 124 LISP_MAP_REPLY, 125 LISP_MAP_REGISTER, 126 LISP_MAP_NOTIFY, 127 LISP_ENCAPSULATED_CONTROL_MESSAGE = 8 128 }; 129 130 enum { 131 LISP_AUTH_NONE, 132 LISP_AUTH_SHA1, 133 LISP_AUTH_SHA256 134 }; 135 136 static const struct tok lisp_type [] = { 137 { 0, "LISP-Reserved" }, 138 { 1, "LISP-Map-Request" }, 139 { 2, "LISP-Map-Reply" }, 140 { 3, "LISP-Map-Register" }, 141 { 4, "LISP-Map-Notify" }, 142 { 8, "LISP-Encapsulated-Contol-Message" }, 143 { 0, NULL } 144 }; 145 146 /* 147 * P-Bit : Request for Proxy Map-Reply from the MS/MR 148 * S-Bit : Security Enhancement. ETR is LISP-SEC enabled. draft-ietf-lisp-sec 149 * I-Bit : 128 bit xTR-ID and 64 bit Site-ID present. 150 * xTR-ID and Site-ID help in differentiation of xTRs in multi xTR 151 * and multi Site deployment scenarios. 152 * R-Bit : Built for a Reencapsulating-Tunnel-Router. Used in Traffic 153 * Engineering and Service Chaining 154 */ 155 static const struct tok map_register_hdr_flag[] = { 156 { 0x08000000, "P-Proxy-Map-Reply" }, 157 { 0x04000000, "S-LISP-SEC-Capable" }, 158 { 0x02000000, "I-xTR-ID-Present" }, 159 { 0x01000000, "R-Build-For-RTR" }, 160 { 0x00000100, "M-Want-Map-Notify" }, 161 { 0, NULL } 162 }; 163 164 static const struct tok map_notify_hdr_flag[] = { 165 { 0x08000000, "I-xTR-ID-Present" }, 166 { 0x04000000, "R-Build-For-RTR" }, 167 { 0, NULL } 168 }; 169 170 static const struct tok auth_type[] = { 171 { LISP_AUTH_NONE, "None" }, 172 { LISP_AUTH_SHA1, "SHA1" }, 173 { LISP_AUTH_SHA256, "SHA256" }, 174 { 0, NULL} 175 }; 176 177 static const struct tok lisp_eid_action[] = { 178 { 0, "No-Action" }, 179 { 1, "Natively-Forward" }, 180 { 2, "Send-Map-Request" }, 181 { 3, "Drop" }, 182 { 0, NULL} 183 }; 184 185 static const struct tok lisp_loc_flag[] = { 186 { 0x0004, "Local-Locator" }, 187 { 0x0002, "RLoc-Probed" }, 188 { 0x0001, "Reachable" }, 189 { 0, NULL } 190 }; 191 192 typedef struct map_register_hdr { 193 nd_uint8_t type_and_flag; 194 nd_uint8_t reserved; 195 nd_uint8_t reserved_and_flag2; 196 nd_uint8_t record_count; 197 nd_uint64_t nonce; 198 nd_uint16_t key_id; 199 nd_uint16_t auth_data_len; 200 } lisp_map_register_hdr; 201 202 #define MAP_REGISTER_HDR_LEN sizeof(lisp_map_register_hdr) 203 204 typedef struct map_register_eid { 205 nd_uint32_t ttl; 206 nd_uint8_t locator_count; 207 nd_uint8_t eid_prefix_mask_length; 208 nd_uint8_t act_auth_inc_res; 209 nd_uint8_t reserved; 210 nd_uint16_t reserved_and_version; 211 nd_uint16_t eid_prefix_afi; 212 } lisp_map_register_eid; 213 214 #define MAP_REGISTER_EID_LEN sizeof(lisp_map_register_eid) 215 216 typedef struct map_register_loc { 217 nd_uint8_t priority; 218 nd_uint8_t weight; 219 nd_uint8_t m_priority; 220 nd_uint8_t m_weight; 221 nd_uint16_t unused_and_flag; 222 nd_uint16_t locator_afi; 223 } lisp_map_register_loc; 224 225 #define MAP_REGISTER_LOC_LEN sizeof(lisp_map_register_loc) 226 227 static uint8_t extract_lisp_type(uint8_t); 228 static uint8_t is_xtr_data_present(uint8_t, uint8_t); 229 static void lisp_hdr_flag(netdissect_options *, const lisp_map_register_hdr *); 230 static void action_flag(netdissect_options *, uint8_t); 231 static void loc_hdr_flag(netdissect_options *, uint16_t); 232 233 void 234 lisp_print(netdissect_options *ndo, const u_char *bp, u_int length) 235 { 236 uint8_t type_and_flag; 237 uint8_t type; 238 uint8_t mask_len; 239 uint8_t loc_count; 240 uint8_t xtr_present; 241 uint8_t record_count; 242 uint16_t key_id; 243 uint16_t eid_afi; 244 uint16_t loc_afi; 245 uint16_t map_version; 246 uint16_t packet_offset; 247 uint16_t auth_data_len; 248 uint32_t ttl; 249 const u_char *packet_iterator; 250 const u_char *loc_ip_pointer; 251 const lisp_map_register_hdr *lisp_hdr; 252 const lisp_map_register_eid *lisp_eid; 253 const lisp_map_register_loc *lisp_loc; 254 255 ndo->ndo_protocol = "lisp"; 256 /* Check if enough bytes for header are available */ 257 ND_TCHECK_LEN(bp, MAP_REGISTER_HDR_LEN); 258 lisp_hdr = (const lisp_map_register_hdr *) bp; 259 lisp_hdr_flag(ndo, lisp_hdr); 260 /* Supporting only MAP NOTIFY and MAP REGISTER LISP packets */ 261 type_and_flag = GET_U_1(lisp_hdr->type_and_flag); 262 type = extract_lisp_type(type_and_flag); 263 if ((type != LISP_MAP_REGISTER) && (type != LISP_MAP_NOTIFY)) 264 return; 265 266 /* Find if the packet contains xTR and Site-ID data */ 267 xtr_present = is_xtr_data_present(type, type_and_flag); 268 269 /* Extract the number of EID records present */ 270 auth_data_len = GET_BE_U_2(lisp_hdr->auth_data_len); 271 packet_iterator = (const u_char *)(lisp_hdr); 272 packet_offset = MAP_REGISTER_HDR_LEN; 273 record_count = GET_U_1(lisp_hdr->record_count); 274 275 if (ndo->ndo_vflag) { 276 key_id = GET_BE_U_2(lisp_hdr->key_id); 277 ND_PRINT("\n %u record(s), ", record_count); 278 ND_PRINT("Authentication %s,", 279 tok2str(auth_type, "unknown-type", key_id)); 280 hex_print(ndo, "\n Authentication-Data: ", packet_iterator + 281 packet_offset, auth_data_len); 282 } else { 283 ND_PRINT(" %u record(s),", record_count); 284 } 285 packet_offset += auth_data_len; 286 287 if (record_count == 0) 288 goto invalid; 289 290 /* Print all the EID records */ 291 while ((length > packet_offset) && (record_count != 0)) { 292 record_count--; 293 ND_TCHECK_LEN(packet_iterator + packet_offset, 294 MAP_REGISTER_EID_LEN); 295 ND_PRINT("\n"); 296 lisp_eid = (const lisp_map_register_eid *) 297 ((const u_char *)lisp_hdr + packet_offset); 298 packet_offset += MAP_REGISTER_EID_LEN; 299 mask_len = GET_U_1(lisp_eid->eid_prefix_mask_length); 300 eid_afi = GET_BE_U_2(lisp_eid->eid_prefix_afi); 301 loc_count = GET_U_1(lisp_eid->locator_count); 302 303 if (ndo->ndo_vflag) { 304 ttl = GET_BE_U_4(lisp_eid->ttl); 305 ND_PRINT(" Record TTL %u,", ttl); 306 action_flag(ndo, GET_U_1(lisp_eid->act_auth_inc_res)); 307 map_version = GET_BE_U_2(lisp_eid->reserved_and_version) & 0x0FFF; 308 ND_PRINT(" Map Version: %u,", map_version); 309 } 310 311 switch (eid_afi) { 312 case IPv4_AFI: 313 ND_PRINT(" EID %s/%u,", 314 GET_IPADDR_STRING(packet_iterator + packet_offset), 315 mask_len); 316 packet_offset += 4; 317 break; 318 case IPv6_AFI: 319 ND_PRINT(" EID %s/%u,", 320 GET_IP6ADDR_STRING(packet_iterator + packet_offset), 321 mask_len); 322 packet_offset += 16; 323 break; 324 default: 325 /* 326 * No support for LCAF right now. 327 */ 328 return; 329 break; 330 } 331 332 ND_PRINT(" %u locator(s)", loc_count); 333 334 while (loc_count != 0) { 335 loc_count--; 336 ND_TCHECK_LEN(packet_iterator + packet_offset, 337 MAP_REGISTER_LOC_LEN); 338 lisp_loc = (const lisp_map_register_loc *) (packet_iterator + packet_offset); 339 loc_ip_pointer = (const u_char *) (lisp_loc + 1); 340 packet_offset += MAP_REGISTER_LOC_LEN; 341 loc_afi = GET_BE_U_2(lisp_loc->locator_afi); 342 343 if (ndo->ndo_vflag) 344 ND_PRINT("\n "); 345 346 switch (loc_afi) { 347 case IPv4_AFI: 348 ND_TCHECK_4(packet_iterator + packet_offset); 349 ND_PRINT(" LOC %s", GET_IPADDR_STRING(loc_ip_pointer)); 350 packet_offset += 4; 351 break; 352 case IPv6_AFI: 353 ND_TCHECK_16(packet_iterator + packet_offset); 354 ND_PRINT(" LOC %s", GET_IP6ADDR_STRING(loc_ip_pointer)); 355 packet_offset += 16; 356 break; 357 default: 358 break; 359 } 360 if (ndo->ndo_vflag) { 361 ND_PRINT("\n Priority/Weight %u/%u," 362 " Multicast Priority/Weight %u/%u,", 363 GET_U_1(lisp_loc->priority), 364 GET_U_1(lisp_loc->weight), 365 GET_U_1(lisp_loc->m_priority), 366 GET_U_1(lisp_loc->m_weight)); 367 loc_hdr_flag(ndo, 368 GET_BE_U_2(lisp_loc->unused_and_flag)); 369 } 370 } 371 } 372 373 /* 374 * Print xTR and Site ID. Handle the fact that the packet could be invalid. 375 * If the xTR_ID_Present bit is not set, and we still have data to display, 376 * show it as hex data. 377 */ 378 if (xtr_present) { 379 if (!ND_TTEST_LEN(packet_iterator + packet_offset, 24)) 380 goto invalid; 381 hex_print(ndo, "\n xTR-ID: ", packet_iterator + packet_offset, 16); 382 ND_PRINT("\n SITE-ID: %" PRIu64, 383 GET_BE_U_8(packet_iterator + packet_offset + 16)); 384 } else { 385 /* Check if packet isn't over yet */ 386 if (packet_iterator + packet_offset < ndo->ndo_snapend) { 387 hex_print(ndo, "\n Data: ", packet_iterator + packet_offset, 388 ND_BYTES_AVAILABLE_AFTER(packet_iterator + packet_offset)); 389 } 390 } 391 return; 392 trunc: 393 nd_print_trunc(ndo); 394 return; 395 invalid: 396 nd_print_invalid(ndo); 397 } 398 399 static uint8_t 400 extract_lisp_type(uint8_t lisp_hdr_flags) 401 { 402 return (lisp_hdr_flags) >> TYPE_INDEX; 403 } 404 405 static uint8_t 406 is_xtr_data_present(uint8_t type, uint8_t lisp_hdr_flags) 407 { 408 uint8_t xtr_present = 0; 409 410 if (type == LISP_MAP_REGISTER) 411 xtr_present = (lisp_hdr_flags) & LISP_MAP_REGISTER_IBIT_MASK; 412 else if (type == LISP_MAP_NOTIFY) 413 xtr_present = (lisp_hdr_flags) & LISP_MAP_NOTIFY_IBIT_MASK; 414 415 return xtr_present; 416 } 417 418 static void lisp_hdr_flag(netdissect_options *ndo, const lisp_map_register_hdr *lisp_hdr) 419 { 420 uint8_t type = extract_lisp_type(GET_U_1(lisp_hdr->type_and_flag)); 421 422 if (!ndo->ndo_vflag) { 423 ND_PRINT("%s,", tok2str(lisp_type, "unknown-type-%u", type)); 424 return; 425 } else { 426 ND_PRINT("%s,", tok2str(lisp_type, "unknown-type-%u", type)); 427 } 428 429 if (type == LISP_MAP_REGISTER) { 430 ND_PRINT(" flags [%s],", bittok2str(map_register_hdr_flag, 431 "none", GET_BE_U_4(lisp_hdr))); 432 } else if (type == LISP_MAP_NOTIFY) { 433 ND_PRINT(" flags [%s],", bittok2str(map_notify_hdr_flag, 434 "none", GET_BE_U_4(lisp_hdr))); 435 } 436 } 437 438 static void action_flag(netdissect_options *ndo, uint8_t act_auth_inc_res) 439 { 440 uint8_t action; 441 uint8_t authoritative; 442 443 authoritative = ((act_auth_inc_res >> 4) & 1); 444 445 if (authoritative) 446 ND_PRINT(" Authoritative,"); 447 else 448 ND_PRINT(" Non-Authoritative,"); 449 450 action = act_auth_inc_res >> 5; 451 ND_PRINT(" %s,", tok2str(lisp_eid_action, "unknown", action)); 452 } 453 454 static void loc_hdr_flag(netdissect_options *ndo, uint16_t flag) 455 { 456 ND_PRINT(" flags [%s],", bittok2str(lisp_loc_flag, "none", flag)); 457 } 458 459