1 /** 2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org> 3 * Copyright (C) 2018 Hans Dedecker <dedeckeh@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License v2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 */ 15 16 #ifndef _ODHCP6C_H_ 17 #define _ODHCP6C_H_ 18 19 #include <netinet/in.h> 20 #include <stdbool.h> 21 #include <stdint.h> 22 23 #ifndef _o_aligned 24 #define _o_aligned(n) __attribute__((aligned(n))) 25 #endif /* _o_aligned */ 26 27 #ifndef _o_fallthrough 28 #define _o_fallthrough __attribute__((__fallthrough__)) 29 #endif /* _o_fallthrough */ 30 31 #ifndef _o_packed 32 #define _o_packed __attribute__((packed)) 33 #endif /* _o_packed */ 34 35 #ifndef _o_unused 36 #define _o_unused __attribute__((unused)) 37 #endif /* _o_unused */ 38 39 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) 40 41 #define ND_OPT_RECURSIVE_DNS 25 42 #define ND_OPT_DNSSL 31 43 44 #define DHCPV6_MAX_DELAY 1 45 #define DHCPV6_IRT_DEFAULT 86400 46 #define DHCPV6_IRT_MIN 600 47 #define DHCPV6_RAND_FACTOR 100 48 49 #define DHCPV6_SOL_INIT_RT 1 50 #define DHCPV6_SOL_MAX_RT 120 51 52 #define DHCPV6_REQ_INIT_RT 1 53 #define DHCPV6_REQ_MAX_RT 30 54 #define DHCPV6_REQ_MAX_RC 10 55 56 #define DHCPV6_REN_INIT_RT 10 57 #define DHCPV6_REN_MAX_RT 600 58 59 #define DHCPV6_REB_INIT_RT 10 60 #define DHCPV6_REB_MAX_RT 600 61 62 #define DHCPV6_INF_INIT_RT 1 63 #define DHCPV6_INF_MAX_RT 3600 64 65 #define DHCPV6_REL_INIT_RT 1 66 #define DHCPV6_REL_MAX_RC 4 67 68 #define DHCPV6_DEC_INIT_RT 1 69 #define DHCPV6_DEC_MAX_RC 4 70 71 #define RA_MIN_ADV_INTERVAL 3 /* RFC 4861 paragraph 6.2.1 */ 72 73 enum dhcvp6_opt { 74 /* RFC8415(bis) */ 75 DHCPV6_OPT_CLIENTID = 1, 76 DHCPV6_OPT_SERVERID = 2, 77 DHCPV6_OPT_IA_NA = 3, 78 DHCPV6_OPT_IA_TA = 4, 79 DHCPV6_OPT_IA_ADDR = 5, 80 DHCPV6_OPT_ORO = 6, 81 DHCPV6_OPT_PREF = 7, 82 DHCPV6_OPT_ELAPSED = 8, 83 DHCPV6_OPT_RELAY_MSG = 9, 84 DHCPV6_OPT_AUTH = 11, 85 DHCPV6_OPT_UNICAST = 12, 86 DHCPV6_OPT_STATUS = 13, 87 DHCPV6_OPT_RAPID_COMMIT = 14, 88 DHCPV6_OPT_USER_CLASS = 15, 89 DHCPV6_OPT_VENDOR_CLASS = 16, 90 DHCPV6_OPT_INTERFACE_ID = 18, 91 DHCPV6_OPT_RECONF_MESSAGE = 19, 92 DHCPV6_OPT_RECONF_ACCEPT = 20, 93 /* RFC3319 */ 94 DHCPV6_OPT_SIP_SERVER_D = 21, 95 DHCPV6_OPT_SIP_SERVER_A = 22, 96 /* RFC3646 */ 97 DHCPV6_OPT_DNS_SERVERS = 23, 98 DHCPV6_OPT_DNS_DOMAIN = 24, 99 /* RFC8415(bis) */ 100 DHCPV6_OPT_IA_PD = 25, 101 DHCPV6_OPT_IA_PREFIX = 26, 102 /* RFC4075 */ 103 DHCPV6_OPT_SNTP_SERVERS = 31, 104 /* RFC4242 */ 105 DHCPV6_OPT_INFO_REFRESH = 32, 106 /* RFC4649 */ 107 DHCPV6_OPT_REMOTE_ID = 37, 108 /* RFC4580 */ 109 DHCPV6_OPT_SUBSCRIBER_ID = 38, 110 /* RFC4704 */ 111 DHCPV6_OPT_FQDN = 39, 112 /* RFC4994 */ 113 DHCPV6_OPT_ERO = 43, 114 /* RFC5007 */ 115 DHCPV6_OPT_LQ_QUERY = 44, 116 DHCPV6_OPT_CLIENT_DATA = 45, 117 DHCPV6_OPT_CLT_TIME = 46, 118 DHCPV6_OPT_LQ_RELAY_DATA = 47, 119 DHCPV6_OPT_LQ_CLIENT_LINK = 48, 120 /* RFC5460 */ 121 DHCPV6_OPT_RELAY_ID = 53, 122 /* RFC5908 */ 123 DHCPV6_OPT_NTP_SERVER = 56, 124 /* RFC5970 */ 125 DHCPV6_OPT_CLIENT_ARCH_TYPE = 61, 126 /* RFC6334 */ 127 DHCPV6_OPT_AFTR_NAME = 64, 128 /* RFC6422 */ 129 DHCPV6_OPT_RSOO = 66, 130 /* RFC6603 */ 131 DHCPV6_OPT_PD_EXCLUDE = 67, 132 /* RFC6607 */ 133 DHCPV6_OPT_VSS = 68, 134 /* RFC6939 */ 135 DHCPV6_OPT_LINK_LAYER_ADDRESS = 79, 136 /* RFC6977 */ 137 DHCPV6_OPT_LINK_ADDRESS = 80, 138 /* RFC7037 */ 139 DHCPV6_OPT_RADIUS = 81, 140 /* RFC8415(bis) */ 141 DHCPV6_OPT_SOL_MAX_RT = 82, 142 DHCPV6_OPT_INF_MAX_RT = 83, 143 /* RFC8415(bis) */ 144 DHCPV6_OPT_DHCPV4_MSG = 87, 145 /* RFC7598 */ 146 DHCPV6_OPT_S46_RULE = 89, 147 DHCPV6_OPT_S46_BR = 90, /* & RFC8539 */ 148 DHCPV6_OPT_S46_DMR = 91, 149 DHCPV6_OPT_S46_V4V6BIND = 92, 150 DHCPV6_OPT_S46_PORTPARAMS = 93, 151 DHCPV6_OPT_S46_CONT_MAPE = 94, 152 DHCPV6_OPT_S46_CONT_MAPT = 95, 153 DHCPV6_OPT_S46_CONT_LW = 96, 154 /* RFC7653 */ 155 DHCPV6_OPT_LQ_BASE_TIME = 100, 156 DHCPV6_OPT_LQ_START_TIME = 101, 157 DHCPV6_OPT_LQ_END_TIME = 102, 158 /* RFC7839 */ 159 DHCPV6_OPT_ANI_ATT = 105, 160 DHCPV6_OPT_ANI_NETWORK_NAME = 106, 161 DHCPV6_OPT_ANI_AP_NAME = 107, 162 DHCPV6_OPT_ANI_AP_BSSID = 108, 163 DHCPV6_OPT_ANI_OPERATOR_ID = 109, 164 DHCPV6_OPT_ANI_OPERATOR_REALM = 110, 165 /* RFC8520 */ 166 DHCPV6_OPT_MUD_URL_V6 = 112, 167 /* RFC8156 */ 168 DHCPV6_OPT_F_BINDING_STATUS = 114, 169 DHCPV6_OPT_F_CONNECT_FLAGS = 115, 170 DHCPV6_OPT_F_DNS_REMOVAL_INFO = 116, 171 DHCPV6_OPT_F_DNS_HOST_NAME = 117, 172 DHCPV6_OPT_F_DNS_ZONE_NAME = 118, 173 DHCPV6_OPT_F_DNS_FLAGS = 119, 174 DHCPV6_OPT_F_EXPIRATION_TIME = 120, 175 DHCPV6_OPT_F_MAX_UNACKED_BNDUPD = 121, 176 DHCPV6_OPT_F_MCLT = 122, 177 DHCPV6_OPT_F_PARTNER_LIFETIME = 123, 178 DHCPV6_OPT_F_PARTNER_LIFETIME_SENT = 124, 179 DHCPV6_OPT_F_PARTNER_DOWN_TIME = 125, 180 DHCPV6_OPT_F_PARTNER_RAW_CLT_TIME = 126, 181 DHCPV6_OPT_F_PROTOCOL_VERSION = 127, 182 DHCPV6_OPT_F_KEEPALIVE_TIME = 128, 183 DHCPV6_OPT_F_RECONFIGURE_DATA = 129, 184 DHCPV6_OPT_F_RELATIONSHIP_NAME = 130, 185 DHCPV6_OPT_F_SERVER_FLAGS = 131, 186 DHCPV6_OPT_F_SERVER_STATE = 132, 187 DHCPV6_OPT_F_START_TIME_OF_STATE = 133, 188 DHCPV6_OPT_F_STATE_EXPIRATION_TIME = 134, 189 /* RFC8357 */ 190 DHCPV6_OPT_RELAY_PORT = 135, 191 }; 192 193 enum dhcpv6_opt_npt { 194 NTP_SRV_ADDR = 1, 195 NTP_MC_ADDR = 2, 196 NTP_SRV_FQDN = 3 197 }; 198 199 enum dhcpv6_msg { 200 /* RFC8415(bis) */ 201 DHCPV6_MSG_UNKNOWN = 0, 202 DHCPV6_MSG_SOLICIT = 1, 203 DHCPV6_MSG_ADVERT = 2, 204 DHCPV6_MSG_REQUEST = 3, 205 DHCPV6_MSG_RENEW = 5, 206 DHCPV6_MSG_REBIND = 6, 207 DHCPV6_MSG_REPLY = 7, 208 DHCPV6_MSG_RELEASE = 8, 209 DHCPV6_MSG_DECLINE = 9, 210 DHCPV6_MSG_RECONF = 10, 211 DHCPV6_MSG_INFO_REQ = 11, 212 _DHCPV6_MSG_MAX 213 }; 214 215 enum dhcpv6_state { 216 DHCPV6_INIT, 217 DHCPV6_SOLICIT, 218 DHCPV6_SOLICIT_PROCESSING, 219 DHCPV6_ADVERT, 220 DHCPV6_REQUEST, 221 DHCPV6_REQUEST_PROCESSING, 222 DHCPV6_REPLY, 223 DHCPV6_BOUND, 224 DHCPV6_BOUND_PROCESSING, 225 DHCPV6_BOUND_REPLY, 226 DHCPV6_RECONF, 227 DHCPV6_RECONF_PROCESSING, 228 DHCPV6_RECONF_REPLY, 229 DHCPV6_RENEW, 230 DHCPV6_RENEW_PROCESSING, 231 DHCPV6_RENEW_REPLY, 232 DHCPV6_REBIND, 233 DHCPV6_REBIND_PROCESSING, 234 DHCPV6_REBIND_REPLY, 235 DHCPV6_INFO, 236 DHCPV6_INFO_PROCESSING, 237 DHCPV6_INFO_REPLY, 238 DHCPV6_EXIT, 239 DHCPV6_RESET 240 }; 241 242 enum dhcpv6_status { 243 /* RFC8415(bis) */ 244 DHCPV6_Success = 0, 245 DHCPV6_UnspecFail = 1, 246 DHCPV6_NoAddrsAvail = 2, 247 DHCPV6_NoBinding = 3, 248 DHCPV6_NotOnLink = 4, 249 DHCPV6_UseMulticast = 5, 250 DHCPV6_NoPrefixAvail = 6, 251 _DHCPV6_Status_Max 252 }; 253 254 enum dhcpv6_config { 255 DHCPV6_STRICT_OPTIONS = 1, 256 DHCPV6_CLIENT_FQDN = 2, 257 DHCPV6_ACCEPT_RECONFIGURE = 4, 258 DHCPV6_IGNORE_OPT_UNICAST = 8, 259 }; 260 261 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc, 262 const void *opt, const void *end, const struct sockaddr_in6 *from); 263 264 // retransmission strategy 265 struct dhcpv6_retx { 266 uint8_t max_delay; 267 uint8_t init_timeo; 268 uint16_t max_timeo; 269 uint8_t max_rc; 270 char name[8]; 271 reply_handler *handler_reply; 272 int(*handler_finish)(void); 273 bool is_retransmit; 274 uint64_t timeout; 275 uint8_t rc; 276 uint64_t start; 277 uint8_t tr_id[3]; 278 int64_t rto; 279 uint64_t round_start; 280 uint64_t round_end; 281 int reply_ret; 282 uint64_t delay_msec; 283 }; 284 285 #define DHCPV6_OPT_HDR_SIZE 4 286 #define DHCPV6_OPT_HDR_SIZE_U 4U 287 #define DHCPV6_DUID_MAX_LEN 130 // 2-byte type + 128-byte DUID, RFC8415, ยง11.1 288 289 // DHCPv6 Protocol Headers 290 struct dhcpv6_header { 291 uint8_t msg_type; 292 uint8_t tr_id[3]; 293 } _o_packed; 294 295 struct dhcpv6_ia_hdr { 296 uint16_t type; 297 uint16_t len; 298 uint32_t iaid; 299 uint32_t t1; 300 uint32_t t2; 301 } _o_packed; 302 303 struct dhcpv6_ia_addr { 304 uint16_t type; 305 uint16_t len; 306 struct in6_addr addr; 307 uint32_t preferred; 308 uint32_t valid; 309 } _o_packed; 310 311 struct dhcpv6_ia_prefix { 312 uint16_t type; 313 uint16_t len; 314 uint32_t preferred; 315 uint32_t valid; 316 uint8_t prefix; 317 struct in6_addr addr; 318 } _o_packed; 319 320 struct dhcpv6_duid { 321 uint16_t type; 322 uint16_t len; 323 uint16_t duid_type; 324 uint8_t data[128]; 325 } _o_packed; 326 327 struct dhcpv6_auth { 328 uint16_t type; 329 uint16_t len; 330 uint8_t protocol; 331 uint8_t algorithm; 332 uint8_t rdm; 333 uint64_t replay; 334 uint8_t data[]; 335 } _o_packed; 336 337 struct dhcpv6_auth_reconfigure { 338 uint8_t reconf_type; 339 uint8_t key[16]; 340 } _o_packed; 341 342 struct dhcpv6_s46_portparams { 343 uint8_t offset; 344 uint8_t psid_len; 345 uint16_t psid; 346 } _o_packed; 347 348 struct dhcpv6_s46_v4v6bind { 349 struct in_addr ipv4_address; 350 uint8_t bindprefix6_len; 351 uint8_t bind_ipv6_prefix[]; 352 } _o_packed; 353 354 struct dhcpv6_s46_dmr { 355 uint8_t dmr_prefix6_len; 356 uint8_t dmr_ipv6_prefix[]; 357 } _o_packed; 358 359 struct dhcpv6_s46_rule { 360 uint8_t flags; 361 uint8_t ea_len; 362 uint8_t prefix4_len; 363 struct in_addr ipv4_prefix; 364 uint8_t prefix6_len; 365 uint8_t ipv6_prefix[]; 366 } _o_packed; 367 368 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\ 369 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\ 370 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\ 371 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \ 372 _o += 4 + (_o[2] << 8 | _o[3])) 373 374 375 struct dhcpv6_server_cand { 376 bool has_noaddravail; 377 bool wants_reconfigure; 378 int16_t preference; 379 uint8_t duid_len; 380 uint8_t duid[DHCPV6_DUID_MAX_LEN]; 381 struct in6_addr server_addr; 382 uint32_t sol_max_rt; 383 uint32_t inf_max_rt; 384 void *ia_na; 385 void *ia_pd; 386 size_t ia_na_len; 387 size_t ia_pd_len; 388 }; 389 390 struct dhcpv6_stats { 391 uint64_t solicit; 392 uint64_t advertise; 393 uint64_t request; 394 uint64_t confirm; 395 uint64_t renew; 396 uint64_t rebind; 397 uint64_t reply; 398 uint64_t release; 399 uint64_t decline; 400 uint64_t reconfigure; 401 uint64_t information_request; 402 uint64_t discarded_packets; 403 uint64_t transmit_failures; 404 }; 405 406 enum odhcp6c_state { 407 STATE_CLIENT_ID, 408 STATE_SERVER_ID, 409 STATE_SERVER_CAND, 410 STATE_SERVER_ADDR, 411 STATE_ORO, 412 STATE_DNS, 413 STATE_SEARCH, 414 STATE_IA_NA, 415 STATE_IA_PD, 416 STATE_IA_PD_INIT, 417 STATE_CUSTOM_OPTS, 418 STATE_SNTP_IP, 419 STATE_NTP_IP, 420 STATE_NTP_FQDN, 421 STATE_SIP_IP, 422 STATE_SIP_FQDN, 423 STATE_RA_ROUTE, 424 STATE_RA_PREFIX, 425 STATE_RA_DNS, 426 STATE_RA_SEARCH, 427 STATE_AFTR_NAME, 428 STATE_OPTS, 429 STATE_S46_MAPT, 430 STATE_S46_MAPE, 431 STATE_S46_LW, 432 STATE_PASSTHRU, 433 _STATE_MAX 434 }; 435 436 struct icmp6_opt { 437 uint8_t type; 438 uint8_t len; 439 uint8_t data[6]; 440 }; 441 442 443 enum dhcpv6_mode { 444 DHCPV6_UNKNOWN = -1, 445 DHCPV6_STATELESS, 446 DHCPV6_STATEFUL 447 }; 448 449 enum ra_config { 450 RA_RDNSS_DEFAULT_LIFETIME = 1, 451 }; 452 453 enum odhcp6c_ia_mode { 454 IA_MODE_NONE, 455 IA_MODE_TRY, 456 IA_MODE_FORCE, 457 }; 458 459 enum odhcp6c_auth_protocol { 460 AUTH_PROT_NONE = -1, 461 /* RFC3118 */ 462 AUTH_PROT_TOKEN = 0, 463 /* RFC8415(bis) */ 464 AUTH_PROT_RKAP = 3, 465 }; 466 467 enum odhcp6c_auth_algorithm { 468 /* RFC3118 */ 469 AUTH_ALG_TOKEN = 0, 470 /* RFC8415(bis) */ 471 AUTH_ALG_HMACMD5 = 1 472 }; 473 474 enum odhcp6c_rkap_type { 475 /* RFC8415(bis) */ 476 RKAP_TYPE_KEY = 1, 477 RKAP_TYPE_HMACMD5 = 2, 478 }; 479 480 struct odhcp6c_entry { 481 struct in6_addr router; 482 uint8_t auxlen; 483 uint8_t length; 484 uint8_t ra_flags; 485 struct in6_addr target; 486 int16_t priority; 487 uint32_t valid; 488 uint32_t preferred; 489 uint32_t t1; 490 uint32_t t2; 491 uint32_t iaid; 492 uint8_t auxtarget[]; 493 }; 494 495 // Include padding after auxtarget to align the next entry 496 #define odhcp6c_entry_size(entry) \ 497 (sizeof(struct odhcp6c_entry) + (((entry)->auxlen + 3) & ~3)) 498 499 #define odhcp6c_next_entry(entry) \ 500 ((struct odhcp6c_entry *)((uint8_t *)(entry) + odhcp6c_entry_size(entry))) 501 502 503 struct odhcp6c_request_prefix { 504 uint32_t iaid; 505 uint8_t length; 506 struct in6_addr addr; 507 }; 508 509 enum odhcp6c_opt_flags { 510 OPT_U8 = 0, 511 OPT_IP6, 512 OPT_STR, 513 OPT_DNS_STR, 514 OPT_USER_CLASS, 515 OPT_MASK_SIZE = 0x0F, 516 OPT_ARRAY = 0x10, 517 OPT_INTERNAL = 0x20, 518 OPT_NO_PASSTHRU = 0x40, 519 OPT_ORO = 0x80, 520 OPT_ORO_STATEFUL = 0x100, 521 OPT_ORO_STATELESS = 0x200, 522 OPT_ORO_SOLICIT = 0x400 523 }; 524 525 struct odhcp6c_opt { 526 uint16_t code; 527 uint16_t flags; 528 const char *str; 529 }; 530 531 int init_dhcpv6(const char *ifname); 532 int dhcpv6_get_ia_mode(void); 533 int dhcpv6_promote_server_cand(void); 534 int dhcpv6_send_request(enum dhcpv6_msg type); 535 int dhcpv6_receive_response(enum dhcpv6_msg type); 536 enum dhcpv6_state dhcpv6_get_state(void); 537 void dhcpv6_set_state(enum dhcpv6_state state); 538 int dhcpv6_get_socket(void); 539 struct dhcpv6_stats dhcpv6_get_stats(void); 540 void dhcpv6_reset_stats(void); 541 int dhcpv6_state_processing(enum dhcpv6_msg type); 542 int dhcpv6_get_state_timeout(void); 543 void dhcpv6_set_state_timeout(int timeout); 544 void dhcpv6_reset_state_timeout(void); 545 const char *dhcpv6_state_to_str(enum dhcpv6_state state); 546 547 int init_rtnetlink(void); 548 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr, 549 uint32_t pref, uint32_t valid); 550 551 int ra_get_hoplimit(void); 552 int ra_get_mtu(void); 553 int ra_get_reachable(void); 554 int ra_get_retransmit(void); 555 556 void notify_state_change(const char *status, int delay, bool resume); 557 558 int script_init(const char *path, const char *ifname); 559 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src); 560 void script_hexlify(char *dst, const uint8_t *src, size_t len); 561 void script_call(const char *status, int delay, bool resume); 562 563 bool odhcp6c_signal_process(void); 564 uint64_t odhcp6c_get_milli_time(void); 565 int odhcp6c_random(void *buf, size_t len); 566 bool odhcp6c_is_bound(void); 567 bool odhcp6c_addr_in_scope(const struct in6_addr *addr); 568 569 // State manipulation 570 void odhcp6c_clear_state(enum odhcp6c_state state); 571 int odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len); 572 void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len); 573 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len); 574 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len); 575 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len); 576 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len); 577 578 // Entry manipulation 579 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new, 580 unsigned int holdoff_interval); 581 582 void odhcp6c_expire(bool expire_ia_pd); 583 uint32_t odhcp6c_elapsed(void); 584 struct odhcp6c_opt *odhcp6c_find_opt(const uint16_t code); 585 struct odhcp6c_opt *odhcp6c_find_opt_by_name(const char *name); 586 587 #endif /* _ODHCP6C_H_ */ 588
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