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 1.5 2024/09/02 16:15:31 christos Exp $"); 100 #endif 101 102 #include <config.h> 103 104 #include "netdissect-stdinc.h" 105 #include "netdissect.h" 106 107 #include "ip.h" 108 #include "ip6.h" 109 110 #include "extract.h" 111 #include "addrtoname.h" 112 113 114 #define IPv4_AFI 1 115 #define IPv6_AFI 2 116 #define TYPE_INDEX 4 117 #define LISP_MAP_NOTIFY_IBIT_MASK 8 118 #define LISP_MAP_REGISTER_IBIT_MASK 2 119 120 enum { 121 LISP_MAP_REQUEST = 1, 122 LISP_MAP_REPLY, 123 LISP_MAP_REGISTER, 124 LISP_MAP_NOTIFY, 125 LISP_ENCAPSULATED_CONTROL_MESSAGE = 8 126 }; 127 128 enum { 129 LISP_AUTH_NONE, 130 LISP_AUTH_SHA1, 131 LISP_AUTH_SHA256 132 }; 133 134 static const struct tok lisp_type [] = { 135 { 0, "LISP-Reserved" }, 136 { 1, "LISP-Map-Request" }, 137 { 2, "LISP-Map-Reply" }, 138 { 3, "LISP-Map-Register" }, 139 { 4, "LISP-Map-Notify" }, 140 { 8, "LISP-Encapsulated-Control-Message" }, 141 { 0, NULL } 142 }; 143 144 /* 145 * P-Bit : Request for Proxy Map-Reply from the MS/MR 146 * S-Bit : Security Enhancement. ETR is LISP-SEC enabled. draft-ietf-lisp-sec 147 * I-Bit : 128 bit xTR-ID and 64 bit Site-ID present. 148 * xTR-ID and Site-ID help in differentiation of xTRs in multi xTR 149 * and multi Site deployment scenarios. 150 * R-Bit : Built for a Reencapsulating-Tunnel-Router. Used in Traffic 151 * Engineering and Service Chaining 152 */ 153 static const struct tok map_register_hdr_flag[] = { 154 { 0x08000000, "P-Proxy-Map-Reply" }, 155 { 0x04000000, "S-LISP-SEC-Capable" }, 156 { 0x02000000, "I-xTR-ID-Present" }, 157 { 0x01000000, "R-Build-For-RTR" }, 158 { 0x00000100, "M-Want-Map-Notify" }, 159 { 0, NULL } 160 }; 161 162 static const struct tok map_notify_hdr_flag[] = { 163 { 0x08000000, "I-xTR-ID-Present" }, 164 { 0x04000000, "R-Build-For-RTR" }, 165 { 0, NULL } 166 }; 167 168 static const struct tok auth_type[] = { 169 { LISP_AUTH_NONE, "None" }, 170 { LISP_AUTH_SHA1, "SHA1" }, 171 { LISP_AUTH_SHA256, "SHA256" }, 172 { 0, NULL} 173 }; 174 175 static const struct tok lisp_eid_action[] = { 176 { 0, "No-Action" }, 177 { 1, "Natively-Forward" }, 178 { 2, "Send-Map-Request" }, 179 { 3, "Drop" }, 180 { 0, NULL} 181 }; 182 183 static const struct tok lisp_loc_flag[] = { 184 { 0x0004, "Local-Locator" }, 185 { 0x0002, "RLoc-Probed" }, 186 { 0x0001, "Reachable" }, 187 { 0, NULL } 188 }; 189 190 typedef struct map_register_hdr { 191 nd_uint8_t type_and_flag; 192 nd_uint8_t reserved; 193 nd_uint8_t reserved_and_flag2; 194 nd_uint8_t record_count; 195 nd_uint64_t nonce; 196 nd_uint16_t key_id; 197 nd_uint16_t auth_data_len; 198 } lisp_map_register_hdr; 199 200 #define MAP_REGISTER_HDR_LEN sizeof(lisp_map_register_hdr) 201 202 typedef struct map_register_eid { 203 nd_uint32_t ttl; 204 nd_uint8_t locator_count; 205 nd_uint8_t eid_prefix_mask_length; 206 nd_uint8_t act_auth_inc_res; 207 nd_uint8_t reserved; 208 nd_uint16_t reserved_and_version; 209 nd_uint16_t eid_prefix_afi; 210 } lisp_map_register_eid; 211 212 #define MAP_REGISTER_EID_LEN sizeof(lisp_map_register_eid) 213 214 typedef struct map_register_loc { 215 nd_uint8_t priority; 216 nd_uint8_t weight; 217 nd_uint8_t m_priority; 218 nd_uint8_t m_weight; 219 nd_uint16_t unused_and_flag; 220 nd_uint16_t locator_afi; 221 } lisp_map_register_loc; 222 223 #define MAP_REGISTER_LOC_LEN sizeof(lisp_map_register_loc) 224 225 static uint8_t extract_lisp_type(uint8_t); 226 static uint8_t is_xtr_data_present(uint8_t, uint8_t); 227 static void lisp_hdr_flag(netdissect_options *, const lisp_map_register_hdr *); 228 static void action_flag(netdissect_options *, uint8_t); 229 static void loc_hdr_flag(netdissect_options *, uint16_t); 230 231 void 232 lisp_print(netdissect_options *ndo, const u_char *bp, u_int length) 233 { 234 uint8_t type_and_flag; 235 uint8_t type; 236 uint8_t mask_len; 237 uint8_t loc_count; 238 uint8_t xtr_present; 239 uint8_t record_count; 240 uint16_t key_id; 241 uint16_t eid_afi; 242 uint16_t loc_afi; 243 uint16_t map_version; 244 uint16_t packet_offset; 245 uint16_t auth_data_len; 246 uint32_t ttl; 247 const u_char *packet_iterator; 248 const u_char *loc_ip_pointer; 249 const lisp_map_register_hdr *lisp_hdr; 250 const lisp_map_register_eid *lisp_eid; 251 const lisp_map_register_loc *lisp_loc; 252 253 ndo->ndo_protocol = "lisp"; 254 /* Check if enough bytes for header are available */ 255 ND_TCHECK_LEN(bp, MAP_REGISTER_HDR_LEN); 256 lisp_hdr = (const lisp_map_register_hdr *) bp; 257 lisp_hdr_flag(ndo, lisp_hdr); 258 /* Supporting only MAP NOTIFY and MAP REGISTER LISP packets */ 259 type_and_flag = GET_U_1(lisp_hdr->type_and_flag); 260 type = extract_lisp_type(type_and_flag); 261 if ((type != LISP_MAP_REGISTER) && (type != LISP_MAP_NOTIFY)) 262 return; 263 264 /* Find if the packet contains xTR and Site-ID data */ 265 xtr_present = is_xtr_data_present(type, type_and_flag); 266 267 /* Extract the number of EID records present */ 268 auth_data_len = GET_BE_U_2(lisp_hdr->auth_data_len); 269 packet_iterator = (const u_char *)(lisp_hdr); 270 packet_offset = MAP_REGISTER_HDR_LEN; 271 record_count = GET_U_1(lisp_hdr->record_count); 272 273 if (ndo->ndo_vflag) { 274 key_id = GET_BE_U_2(lisp_hdr->key_id); 275 ND_PRINT("\n %u record(s), ", record_count); 276 ND_PRINT("Authentication %s,", 277 tok2str(auth_type, "unknown-type", key_id)); 278 hex_print(ndo, "\n Authentication-Data: ", packet_iterator + 279 packet_offset, auth_data_len); 280 } else { 281 ND_PRINT(" %u record(s),", record_count); 282 } 283 packet_offset += auth_data_len; 284 285 if (record_count == 0) 286 goto invalid; 287 288 /* Print all the EID records */ 289 while ((length > packet_offset) && (record_count != 0)) { 290 record_count--; 291 ND_TCHECK_LEN(packet_iterator + packet_offset, 292 MAP_REGISTER_EID_LEN); 293 ND_PRINT("\n"); 294 lisp_eid = (const lisp_map_register_eid *) 295 ((const u_char *)lisp_hdr + packet_offset); 296 packet_offset += MAP_REGISTER_EID_LEN; 297 mask_len = GET_U_1(lisp_eid->eid_prefix_mask_length); 298 eid_afi = GET_BE_U_2(lisp_eid->eid_prefix_afi); 299 loc_count = GET_U_1(lisp_eid->locator_count); 300 301 if (ndo->ndo_vflag) { 302 ttl = GET_BE_U_4(lisp_eid->ttl); 303 ND_PRINT(" Record TTL %u,", ttl); 304 action_flag(ndo, GET_U_1(lisp_eid->act_auth_inc_res)); 305 map_version = GET_BE_U_2(lisp_eid->reserved_and_version) & 0x0FFF; 306 ND_PRINT(" Map Version: %u,", map_version); 307 } 308 309 switch (eid_afi) { 310 case IPv4_AFI: 311 ND_PRINT(" EID %s/%u,", 312 GET_IPADDR_STRING(packet_iterator + packet_offset), 313 mask_len); 314 packet_offset += 4; 315 break; 316 case IPv6_AFI: 317 ND_PRINT(" EID %s/%u,", 318 GET_IP6ADDR_STRING(packet_iterator + packet_offset), 319 mask_len); 320 packet_offset += 16; 321 break; 322 default: 323 /* 324 * No support for LCAF right now. 325 */ 326 return; 327 break; 328 } 329 330 ND_PRINT(" %u locator(s)", loc_count); 331 332 while (loc_count != 0) { 333 loc_count--; 334 ND_TCHECK_LEN(packet_iterator + packet_offset, 335 MAP_REGISTER_LOC_LEN); 336 lisp_loc = (const lisp_map_register_loc *) (packet_iterator + packet_offset); 337 loc_ip_pointer = (const u_char *) (lisp_loc + 1); 338 packet_offset += MAP_REGISTER_LOC_LEN; 339 loc_afi = GET_BE_U_2(lisp_loc->locator_afi); 340 341 if (ndo->ndo_vflag) 342 ND_PRINT("\n "); 343 344 switch (loc_afi) { 345 case IPv4_AFI: 346 ND_TCHECK_4(packet_iterator + packet_offset); 347 ND_PRINT(" LOC %s", GET_IPADDR_STRING(loc_ip_pointer)); 348 packet_offset += 4; 349 break; 350 case IPv6_AFI: 351 ND_TCHECK_16(packet_iterator + packet_offset); 352 ND_PRINT(" LOC %s", GET_IP6ADDR_STRING(loc_ip_pointer)); 353 packet_offset += 16; 354 break; 355 default: 356 break; 357 } 358 if (ndo->ndo_vflag) { 359 ND_PRINT("\n Priority/Weight %u/%u," 360 " Multicast Priority/Weight %u/%u,", 361 GET_U_1(lisp_loc->priority), 362 GET_U_1(lisp_loc->weight), 363 GET_U_1(lisp_loc->m_priority), 364 GET_U_1(lisp_loc->m_weight)); 365 loc_hdr_flag(ndo, 366 GET_BE_U_2(lisp_loc->unused_and_flag)); 367 } 368 } 369 } 370 371 /* 372 * Print xTR and Site ID. Handle the fact that the packet could be invalid. 373 * If the xTR_ID_Present bit is not set, and we still have data to display, 374 * show it as hex data. 375 */ 376 if (xtr_present) { 377 if (!ND_TTEST_LEN(packet_iterator + packet_offset, 24)) 378 goto invalid; 379 hex_print(ndo, "\n xTR-ID: ", packet_iterator + packet_offset, 16); 380 ND_PRINT("\n SITE-ID: %" PRIu64, 381 GET_BE_U_8(packet_iterator + packet_offset + 16)); 382 } else { 383 /* Check if packet isn't over yet */ 384 if (packet_iterator + packet_offset < ndo->ndo_snapend) { 385 hex_print(ndo, "\n Data: ", packet_iterator + packet_offset, 386 ND_BYTES_AVAILABLE_AFTER(packet_iterator + packet_offset)); 387 } 388 } 389 return; 390 trunc: 391 nd_print_trunc(ndo); 392 return; 393 invalid: 394 nd_print_invalid(ndo); 395 } 396 397 static uint8_t 398 extract_lisp_type(uint8_t lisp_hdr_flags) 399 { 400 return (lisp_hdr_flags) >> TYPE_INDEX; 401 } 402 403 static uint8_t 404 is_xtr_data_present(uint8_t type, uint8_t lisp_hdr_flags) 405 { 406 uint8_t xtr_present = 0; 407 408 if (type == LISP_MAP_REGISTER) 409 xtr_present = (lisp_hdr_flags) & LISP_MAP_REGISTER_IBIT_MASK; 410 else if (type == LISP_MAP_NOTIFY) 411 xtr_present = (lisp_hdr_flags) & LISP_MAP_NOTIFY_IBIT_MASK; 412 413 return xtr_present; 414 } 415 416 static void lisp_hdr_flag(netdissect_options *ndo, const lisp_map_register_hdr *lisp_hdr) 417 { 418 uint8_t type = extract_lisp_type(GET_U_1(lisp_hdr->type_and_flag)); 419 420 if (!ndo->ndo_vflag) { 421 ND_PRINT("%s,", tok2str(lisp_type, "unknown-type-%u", type)); 422 return; 423 } else { 424 ND_PRINT("%s,", tok2str(lisp_type, "unknown-type-%u", type)); 425 } 426 427 if (type == LISP_MAP_REGISTER) { 428 ND_PRINT(" flags [%s],", bittok2str(map_register_hdr_flag, 429 "none", GET_BE_U_4(lisp_hdr))); 430 } else if (type == LISP_MAP_NOTIFY) { 431 ND_PRINT(" flags [%s],", bittok2str(map_notify_hdr_flag, 432 "none", GET_BE_U_4(lisp_hdr))); 433 } 434 } 435 436 static void action_flag(netdissect_options *ndo, uint8_t act_auth_inc_res) 437 { 438 uint8_t action; 439 uint8_t authoritative; 440 441 authoritative = ((act_auth_inc_res >> 4) & 1); 442 443 if (authoritative) 444 ND_PRINT(" Authoritative,"); 445 else 446 ND_PRINT(" Non-Authoritative,"); 447 448 action = act_auth_inc_res >> 5; 449 ND_PRINT(" %s,", tok2str(lisp_eid_action, "unknown", action)); 450 } 451 452 static void loc_hdr_flag(netdissect_options *ndo, uint16_t flag) 453 { 454 ND_PRINT(" flags [%s],", bittok2str(lisp_loc_flag, "none", flag)); 455 } 456 457