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 #pragma once 16 #include <stdint.h> 17 #include <stdbool.h> 18 #include <netinet/in.h> 19 20 #define _unused __attribute__((unused)) 21 #define _packed __attribute__((packed)) 22 #define _aligned(n) __attribute__((aligned(n))) 23 24 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) 25 26 #define ND_OPT_RECURSIVE_DNS 25 27 #define ND_OPT_DNSSL 31 28 29 #define DHCPV6_SOL_MAX_RT 120 30 #define DHCPV6_REQ_MAX_RT 30 31 #define DHCPV6_CNF_MAX_RT 4 32 #define DHCPV6_REN_MAX_RT 600 33 #define DHCPV6_REB_MAX_RT 600 34 #define DHCPV6_INF_MAX_RT 120 35 36 #define RA_MIN_ADV_INTERVAL 3 /* RFC 4861 paragraph 6.2.1 */ 37 38 enum dhcvp6_opt { 39 DHCPV6_OPT_CLIENTID = 1, 40 DHCPV6_OPT_SERVERID = 2, 41 DHCPV6_OPT_IA_NA = 3, 42 DHCPV6_OPT_IA_TA = 4, 43 DHCPV6_OPT_IA_ADDR = 5, 44 DHCPV6_OPT_ORO = 6, 45 DHCPV6_OPT_PREF = 7, 46 DHCPV6_OPT_ELAPSED = 8, 47 DHCPV6_OPT_RELAY_MSG = 9, 48 DHCPV6_OPT_AUTH = 11, 49 DHCPV6_OPT_UNICAST = 12, 50 DHCPV6_OPT_STATUS = 13, 51 DHCPV6_OPT_RAPID_COMMIT = 14, 52 DHCPV6_OPT_USER_CLASS = 15, 53 DHCPV6_OPT_VENDOR_CLASS = 16, 54 DHCPV6_OPT_INTERFACE_ID = 18, 55 DHCPV6_OPT_RECONF_MESSAGE = 19, 56 DHCPV6_OPT_RECONF_ACCEPT = 20, 57 DHCPV6_OPT_SIP_SERVER_D = 21, 58 DHCPV6_OPT_SIP_SERVER_A = 22, 59 DHCPV6_OPT_DNS_SERVERS = 23, 60 DHCPV6_OPT_DNS_DOMAIN = 24, 61 DHCPV6_OPT_IA_PD = 25, 62 DHCPV6_OPT_IA_PREFIX = 26, 63 DHCPV6_OPT_SNTP_SERVERS = 31, 64 DHCPV6_OPT_INFO_REFRESH = 32, 65 DHCPV6_OPT_REMOTE_ID = 37, 66 DHCPV6_OPT_SUBSCRIBER_ID = 38, 67 DHCPV6_OPT_FQDN = 39, 68 DHCPV6_OPT_ERO = 43, 69 DHCPV6_OPT_LQ_QUERY = 44, 70 DHCPV6_OPT_CLIENT_DATA = 45, 71 DHCPV6_OPT_CLT_TIME = 46, 72 DHCPV6_OPT_LQ_RELAY_DATA = 47, 73 DHCPV6_OPT_LQ_CLIENT_LINK = 48, 74 DHCPV6_OPT_RELAY_ID = 53, 75 DHCPV6_OPT_NTP_SERVER = 56, 76 DHCPV6_OPT_CLIENT_ARCH_TYPE = 61, 77 DHCPV6_OPT_AFTR_NAME = 64, 78 DHCPV6_OPT_RSOO = 66, 79 DHCPV6_OPT_PD_EXCLUDE = 67, 80 DHCPV6_OPT_VSS = 68, 81 DHCPV6_OPT_LINK_LAYER_ADDRESS = 79, 82 DHCPV6_OPT_LINK_ADDRESS = 80, 83 DHCPV6_OPT_RADIUS = 81, 84 DHCPV6_OPT_SOL_MAX_RT = 82, 85 DHCPV6_OPT_INF_MAX_RT = 83, 86 #ifdef EXT_CER_ID 87 /* draft-donley-dhc-cer-id-option-03 */ 88 DHCPV6_OPT_CER_ID = EXT_CER_ID, 89 #endif 90 DHCPV6_OPT_DHCPV4_MSG = 87, 91 /* draft-ietf-softwire-map-dhcp-08 */ 92 DHCPV6_OPT_S46_RULE = 89, 93 DHCPV6_OPT_S46_BR = 90, 94 DHCPV6_OPT_S46_DMR = 91, 95 DHCPV6_OPT_S46_V4V6BIND = 92, 96 DHCPV6_OPT_S46_PORTPARAMS = 93, 97 DHCPV6_OPT_S46_CONT_MAPE = 94, 98 DHCPV6_OPT_S46_CONT_MAPT = 95, 99 DHCPV6_OPT_S46_CONT_LW = 96, 100 DHCPV6_OPT_LQ_BASE_TIME = 100, 101 DHCPV6_OPT_LQ_START_TIME = 101, 102 DHCPV6_OPT_LQ_END_TIME = 102, 103 DHCPV6_OPT_ANI_ATT = 105, 104 DHCPV6_OPT_ANI_NETWORK_NAME = 106, 105 DHCPV6_OPT_ANI_AP_NAME = 107, 106 DHCPV6_OPT_ANI_AP_BSSID = 108, 107 DHCPV6_OPT_ANI_OPERATOR_ID = 109, 108 DHCPV6_OPT_ANI_OPERATOR_REALM = 110, 109 DHCPV6_OPT_MUD_URL_V6 = 112, 110 DHCPV6_OPT_F_BINDING_STATUS = 114, 111 DHCPV6_OPT_F_CONNECT_FLAGS = 115, 112 DHCPV6_OPT_F_DNS_REMOVAL_INFO = 116, 113 DHCPV6_OPT_F_DNS_HOST_NAME = 117, 114 DHCPV6_OPT_F_DNS_ZONE_NAME = 118, 115 DHCPV6_OPT_F_DNS_FLAGS = 119, 116 DHCPV6_OPT_F_EXPIRATION_TIME = 120, 117 DHCPV6_OPT_F_MAX_UNACKED_BNDUPD = 121, 118 DHCPV6_OPT_F_MCLT = 122, 119 DHCPV6_OPT_F_PARTNER_LIFETIME = 123, 120 DHCPV6_OPT_F_PARTNER_LIFETIME_SENT = 124, 121 DHCPV6_OPT_F_PARTNER_DOWN_TIME = 125, 122 DHCPV6_OPT_F_PARTNER_RAW_CLT_TIME = 126, 123 DHCPV6_OPT_F_PROTOCOL_VERSION = 127, 124 DHCPV6_OPT_F_KEEPALIVE_TIME = 128, 125 DHCPV6_OPT_F_RECONFIGURE_DATA = 129, 126 DHCPV6_OPT_F_RELATIONSHIP_NAME = 130, 127 DHCPV6_OPT_F_SERVER_FLAGS = 131, 128 DHCPV6_OPT_F_SERVER_STATE = 132, 129 DHCPV6_OPT_F_START_TIME_OF_STATE = 133, 130 DHCPV6_OPT_F_STATE_EXPIRATION_TIME = 134, 131 DHCPV6_OPT_RELAY_PORT = 135, 132 }; 133 134 enum dhcpv6_opt_npt { 135 NTP_SRV_ADDR = 1, 136 NTP_MC_ADDR = 2, 137 NTP_SRV_FQDN = 3 138 }; 139 140 enum dhcpv6_msg { 141 DHCPV6_MSG_UNKNOWN = 0, 142 DHCPV6_MSG_SOLICIT = 1, 143 DHCPV6_MSG_ADVERT = 2, 144 DHCPV6_MSG_REQUEST = 3, 145 DHCPV6_MSG_RENEW = 5, 146 DHCPV6_MSG_REBIND = 6, 147 DHCPV6_MSG_REPLY = 7, 148 DHCPV6_MSG_RELEASE = 8, 149 DHCPV6_MSG_DECLINE = 9, 150 DHCPV6_MSG_RECONF = 10, 151 DHCPV6_MSG_INFO_REQ = 11, 152 _DHCPV6_MSG_MAX 153 }; 154 155 enum dhcpv6_status { 156 DHCPV6_Success = 0, 157 DHCPV6_UnspecFail = 1, 158 DHCPV6_NoAddrsAvail = 2, 159 DHCPV6_NoBinding = 3, 160 DHCPV6_NotOnLink = 4, 161 DHCPV6_UseMulticast = 5, 162 DHCPV6_NoPrefixAvail = 6, 163 _DHCPV6_Status_Max 164 }; 165 166 enum dhcpv6_config { 167 DHCPV6_STRICT_OPTIONS = 1, 168 DHCPV6_CLIENT_FQDN = 2, 169 DHCPV6_ACCEPT_RECONFIGURE = 4, 170 DHCPV6_IGNORE_OPT_UNICAST = 8, 171 }; 172 173 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc, 174 const void *opt, const void *end, const struct sockaddr_in6 *from); 175 176 // retransmission strategy 177 struct dhcpv6_retx { 178 bool delay; 179 uint8_t init_timeo; 180 uint16_t max_timeo; 181 uint8_t max_rc; 182 char name[8]; 183 reply_handler *handler_reply; 184 int(*handler_finish)(void); 185 }; 186 187 // DHCPv6 Protocol Headers 188 struct dhcpv6_header { 189 uint8_t msg_type; 190 uint8_t tr_id[3]; 191 } __attribute__((packed)); 192 193 struct dhcpv6_ia_hdr { 194 uint16_t type; 195 uint16_t len; 196 uint32_t iaid; 197 uint32_t t1; 198 uint32_t t2; 199 } _packed; 200 201 struct dhcpv6_ia_addr { 202 uint16_t type; 203 uint16_t len; 204 struct in6_addr addr; 205 uint32_t preferred; 206 uint32_t valid; 207 } _packed; 208 209 struct dhcpv6_ia_prefix { 210 uint16_t type; 211 uint16_t len; 212 uint32_t preferred; 213 uint32_t valid; 214 uint8_t prefix; 215 struct in6_addr addr; 216 } _packed; 217 218 struct dhcpv6_duid { 219 uint16_t type; 220 uint16_t len; 221 uint16_t duid_type; 222 uint8_t data[128]; 223 } _packed; 224 225 struct dhcpv6_auth_reconfigure { 226 uint16_t type; 227 uint16_t len; 228 uint8_t protocol; 229 uint8_t algorithm; 230 uint8_t rdm; 231 uint64_t replay; 232 uint8_t reconf_type; 233 uint8_t key[16]; 234 } _packed; 235 236 struct dhcpv6_cer_id { 237 uint16_t type; 238 uint16_t len; 239 struct in6_addr addr; 240 } _packed; 241 242 struct dhcpv6_s46_portparams { 243 uint8_t offset; 244 uint8_t psid_len; 245 uint16_t psid; 246 } _packed; 247 248 struct dhcpv6_s46_v4v6bind { 249 struct in_addr ipv4_address; 250 uint8_t bindprefix6_len; 251 uint8_t bind_ipv6_prefix[]; 252 } _packed; 253 254 struct dhcpv6_s46_dmr { 255 uint8_t dmr_prefix6_len; 256 uint8_t dmr_ipv6_prefix[]; 257 } _packed; 258 259 struct dhcpv6_s46_rule { 260 uint8_t flags; 261 uint8_t ea_len; 262 uint8_t prefix4_len; 263 struct in_addr ipv4_prefix; 264 uint8_t prefix6_len; 265 uint8_t ipv6_prefix[]; 266 } _packed; 267 268 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\ 269 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\ 270 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\ 271 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \ 272 _o += 4 + (_o[2] << 8 | _o[3])) 273 274 275 struct dhcpv6_server_cand { 276 bool has_noaddravail; 277 bool wants_reconfigure; 278 int16_t preference; 279 uint8_t duid_len; 280 uint8_t duid[130]; 281 struct in6_addr server_addr; 282 uint32_t sol_max_rt; 283 uint32_t inf_max_rt; 284 void *ia_na; 285 void *ia_pd; 286 size_t ia_na_len; 287 size_t ia_pd_len; 288 }; 289 290 291 enum odhcp6c_state { 292 STATE_CLIENT_ID, 293 STATE_SERVER_ID, 294 STATE_SERVER_CAND, 295 STATE_SERVER_ADDR, 296 STATE_ORO, 297 STATE_DNS, 298 STATE_SEARCH, 299 STATE_IA_NA, 300 STATE_IA_PD, 301 STATE_IA_PD_INIT, 302 STATE_CUSTOM_OPTS, 303 STATE_SNTP_IP, 304 STATE_NTP_IP, 305 STATE_NTP_FQDN, 306 STATE_SIP_IP, 307 STATE_SIP_FQDN, 308 STATE_RA_ROUTE, 309 STATE_RA_PREFIX, 310 STATE_RA_DNS, 311 STATE_RA_SEARCH, 312 STATE_AFTR_NAME, 313 STATE_OPTS, 314 STATE_CER, 315 STATE_S46_MAPT, 316 STATE_S46_MAPE, 317 STATE_S46_LW, 318 STATE_PASSTHRU, 319 _STATE_MAX 320 }; 321 322 struct icmp6_opt { 323 uint8_t type; 324 uint8_t len; 325 uint8_t data[6]; 326 }; 327 328 329 enum dhcpv6_mode { 330 DHCPV6_UNKNOWN = -1, 331 DHCPV6_STATELESS, 332 DHCPV6_STATEFUL 333 }; 334 335 enum ra_config { 336 RA_RDNSS_DEFAULT_LIFETIME = 1, 337 }; 338 339 enum odhcp6c_ia_mode { 340 IA_MODE_NONE, 341 IA_MODE_TRY, 342 IA_MODE_FORCE, 343 }; 344 345 346 struct odhcp6c_entry { 347 struct in6_addr router; 348 uint8_t auxlen; 349 uint8_t length; 350 struct in6_addr target; 351 int16_t priority; 352 uint32_t valid; 353 uint32_t preferred; 354 uint32_t t1; 355 uint32_t t2; 356 uint32_t iaid; 357 uint8_t auxtarget[]; 358 }; 359 360 // Include padding after auxtarget to align the next entry 361 #define odhcp6c_entry_size(entry) \ 362 (sizeof(struct odhcp6c_entry) + (((entry)->auxlen + 3) & ~3)) 363 364 #define odhcp6c_next_entry(entry) \ 365 ((struct odhcp6c_entry *)((uint8_t *)(entry) + odhcp6c_entry_size(entry))) 366 367 368 struct odhcp6c_request_prefix { 369 uint32_t iaid; 370 uint16_t length; 371 }; 372 373 enum odhcp6c_opt_flags { 374 OPT_U8 = 0, 375 OPT_IP6, 376 OPT_STR, 377 OPT_DNS_STR, 378 OPT_USER_CLASS, 379 OPT_MASK_SIZE = 0x0F, 380 OPT_ARRAY = 0x10, 381 OPT_INTERNAL = 0x20, 382 OPT_NO_PASSTHRU = 0x40, 383 OPT_ORO = 0x80, 384 OPT_ORO_STATEFUL = 0x100, 385 OPT_ORO_STATELESS = 0x200, 386 OPT_ORO_SOLICIT = 0x400 387 }; 388 389 struct odhcp6c_opt { 390 uint16_t code; 391 uint16_t flags; 392 const char *str; 393 }; 394 395 int init_dhcpv6(const char *ifname, unsigned int client_options, int sk_prio, int sol_timeout); 396 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd, bool stateful_only); 397 int dhcpv6_request(enum dhcpv6_msg type); 398 int dhcpv6_poll_reconfigure(void); 399 int dhcpv6_promote_server_cand(void); 400 401 int init_rtnetlink(void); 402 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr, 403 uint32_t pref, uint32_t valid); 404 405 int ra_get_hoplimit(void); 406 int ra_get_mtu(void); 407 int ra_get_reachable(void); 408 int ra_get_retransmit(void); 409 410 int script_init(const char *path, const char *ifname); 411 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src); 412 void script_call(const char *status, int delay, bool resume); 413 414 bool odhcp6c_signal_process(void); 415 uint64_t odhcp6c_get_milli_time(void); 416 int odhcp6c_random(void *buf, size_t len); 417 bool odhcp6c_is_bound(void); 418 bool odhcp6c_addr_in_scope(const struct in6_addr *addr); 419 420 // State manipulation 421 void odhcp6c_clear_state(enum odhcp6c_state state); 422 int odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len); 423 void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len); 424 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len); 425 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len); 426 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len); 427 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len); 428 429 // Entry manipulation 430 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new, 431 uint32_t safe, unsigned int holdoff_interval); 432 433 void odhcp6c_expire(bool expire_ia_pd); 434 uint32_t odhcp6c_elapsed(void); 435 struct odhcp6c_opt *odhcp6c_find_opt(const uint16_t code); 436
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