1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 5 * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 /** 13 * DOC: Wireless regulatory infrastructure 14 * 15 * The usual implementation is for a driver to read a device EEPROM to 16 * determine which regulatory domain it should be operating under, then 17 * looking up the allowable channels in a driver-local table and finally 18 * registering those channels in the wiphy structure. 19 * 20 * Another set of compliance enforcement is for drivers to use their 21 * own compliance limits which can be stored on the EEPROM. The host 22 * driver or firmware may ensure these are used. 23 * 24 * In addition to all this we provide an extra layer of regulatory 25 * conformance. For drivers which do not have any regulatory 26 * information CRDA provides the complete regulatory solution. 27 * For others it provides a community effort on further restrictions 28 * to enhance compliance. 29 * 30 * Note: When number of rules --> infinity we will not be able to 31 * index on alpha2 any more, instead we'll probably have to 32 * rely on some SHA1 checksum of the regdomain for example. 33 * 34 */ 35 36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 37 38 #include <linux/kernel.h> 39 #include <linux/export.h> 40 #include <linux/slab.h> 41 #include <linux/list.h> 42 #include <linux/random.h> 43 #include <linux/ctype.h> 44 #include <linux/nl80211.h> 45 #include <linux/platform_device.h> 46 #include <linux/moduleparam.h> 47 #include <net/cfg80211.h> 48 #include "core.h" 49 #include "reg.h" 50 #include "regdb.h" 51 #include "nl80211.h" 52 53 #ifdef CONFIG_CFG80211_REG_DEBUG 54 #define REG_DBG_PRINT(format, args...) \ 55 printk(KERN_DEBUG pr_fmt(format), ##args) 56 #else 57 #define REG_DBG_PRINT(args...) 58 #endif 59 60 static struct regulatory_request core_request_world = { 61 .initiator = NL80211_REGDOM_SET_BY_CORE, 62 .alpha2[0] = '0', 63 .alpha2[1] = '0', 64 .intersect = false, 65 .processed = true, 66 .country_ie_env = ENVIRON_ANY, 67 }; 68 69 /* Receipt of information from last regulatory request */ 70 static struct regulatory_request *last_request = &core_request_world; 71 72 /* To trigger userspace events */ 73 static struct platform_device *reg_pdev; 74 75 static struct device_type reg_device_type = { 76 .uevent = reg_device_uevent, 77 }; 78 79 /* 80 * Central wireless core regulatory domains, we only need two, 81 * the current one and a world regulatory domain in case we have no 82 * information to give us an alpha2 83 */ 84 const struct ieee80211_regdomain *cfg80211_regdomain; 85 86 /* 87 * Protects static reg.c components: 88 * - cfg80211_world_regdom 89 * - cfg80211_regdom 90 * - last_request 91 */ 92 static DEFINE_MUTEX(reg_mutex); 93 94 static inline void assert_reg_lock(void) 95 { 96 lockdep_assert_held(®_mutex); 97 } 98 99 /* Used to queue up regulatory hints */ 100 static LIST_HEAD(reg_requests_list); 101 static spinlock_t reg_requests_lock; 102 103 /* Used to queue up beacon hints for review */ 104 static LIST_HEAD(reg_pending_beacons); 105 static spinlock_t reg_pending_beacons_lock; 106 107 /* Used to keep track of processed beacon hints */ 108 static LIST_HEAD(reg_beacon_list); 109 110 struct reg_beacon { 111 struct list_head list; 112 struct ieee80211_channel chan; 113 }; 114 115 static void reg_todo(struct work_struct *work); 116 static DECLARE_WORK(reg_work, reg_todo); 117 118 static void reg_timeout_work(struct work_struct *work); 119 static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work); 120 121 /* We keep a static world regulatory domain in case of the absence of CRDA */ 122 static const struct ieee80211_regdomain world_regdom = { 123 .n_reg_rules = 5, 124 .alpha2 = "00", 125 .reg_rules = { 126 /* IEEE 802.11b/g, channels 1..11 */ 127 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), 128 /* IEEE 802.11b/g, channels 12..13. No HT40 129 * channel fits here. */ 130 REG_RULE(2467-10, 2472+10, 20, 6, 20, 131 NL80211_RRF_PASSIVE_SCAN | 132 NL80211_RRF_NO_IBSS), 133 /* IEEE 802.11 channel 14 - Only JP enables 134 * this and for 802.11b only */ 135 REG_RULE(2484-10, 2484+10, 20, 6, 20, 136 NL80211_RRF_PASSIVE_SCAN | 137 NL80211_RRF_NO_IBSS | 138 NL80211_RRF_NO_OFDM), 139 /* IEEE 802.11a, channel 36..48 */ 140 REG_RULE(5180-10, 5240+10, 40, 6, 20, 141 NL80211_RRF_PASSIVE_SCAN | 142 NL80211_RRF_NO_IBSS), 143 144 /* NB: 5260 MHz - 5700 MHz requies DFS */ 145 146 /* IEEE 802.11a, channel 149..165 */ 147 REG_RULE(5745-10, 5825+10, 40, 6, 20, 148 NL80211_RRF_PASSIVE_SCAN | 149 NL80211_RRF_NO_IBSS), 150 } 151 }; 152 153 static const struct ieee80211_regdomain *cfg80211_world_regdom = 154 &world_regdom; 155 156 static char *ieee80211_regdom = "00"; 157 static char user_alpha2[2]; 158 159 module_param(ieee80211_regdom, charp, 0444); 160 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); 161 162 static void reset_regdomains(bool full_reset) 163 { 164 /* avoid freeing static information or freeing something twice */ 165 if (cfg80211_regdomain == cfg80211_world_regdom) 166 cfg80211_regdomain = NULL; 167 if (cfg80211_world_regdom == &world_regdom) 168 cfg80211_world_regdom = NULL; 169 if (cfg80211_regdomain == &world_regdom) 170 cfg80211_regdomain = NULL; 171 172 kfree(cfg80211_regdomain); 173 kfree(cfg80211_world_regdom); 174 175 cfg80211_world_regdom = &world_regdom; 176 cfg80211_regdomain = NULL; 177 178 if (!full_reset) 179 return; 180 181 if (last_request != &core_request_world) 182 kfree(last_request); 183 last_request = &core_request_world; 184 } 185 186 /* 187 * Dynamic world regulatory domain requested by the wireless 188 * core upon initialization 189 */ 190 static void update_world_regdomain(const struct ieee80211_regdomain *rd) 191 { 192 BUG_ON(!last_request); 193 194 reset_regdomains(false); 195 196 cfg80211_world_regdom = rd; 197 cfg80211_regdomain = rd; 198 } 199 200 bool is_world_regdom(const char *alpha2) 201 { 202 if (!alpha2) 203 return false; 204 if (alpha2[0] == '0' && alpha2[1] == '0') 205 return true; 206 return false; 207 } 208 209 static bool is_alpha2_set(const char *alpha2) 210 { 211 if (!alpha2) 212 return false; 213 if (alpha2[0] != 0 && alpha2[1] != 0) 214 return true; 215 return false; 216 } 217 218 static bool is_unknown_alpha2(const char *alpha2) 219 { 220 if (!alpha2) 221 return false; 222 /* 223 * Special case where regulatory domain was built by driver 224 * but a specific alpha2 cannot be determined 225 */ 226 if (alpha2[0] == '9' && alpha2[1] == '9') 227 return true; 228 return false; 229 } 230 231 static bool is_intersected_alpha2(const char *alpha2) 232 { 233 if (!alpha2) 234 return false; 235 /* 236 * Special case where regulatory domain is the 237 * result of an intersection between two regulatory domain 238 * structures 239 */ 240 if (alpha2[0] == '9' && alpha2[1] == '8') 241 return true; 242 return false; 243 } 244 245 static bool is_an_alpha2(const char *alpha2) 246 { 247 if (!alpha2) 248 return false; 249 if (isalpha(alpha2[0]) && isalpha(alpha2[1])) 250 return true; 251 return false; 252 } 253 254 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) 255 { 256 if (!alpha2_x || !alpha2_y) 257 return false; 258 if (alpha2_x[0] == alpha2_y[0] && 259 alpha2_x[1] == alpha2_y[1]) 260 return true; 261 return false; 262 } 263 264 static bool regdom_changes(const char *alpha2) 265 { 266 assert_cfg80211_lock(); 267 268 if (!cfg80211_regdomain) 269 return true; 270 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) 271 return false; 272 return true; 273 } 274 275 /* 276 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets 277 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER 278 * has ever been issued. 279 */ 280 static bool is_user_regdom_saved(void) 281 { 282 if (user_alpha2[0] == '9' && user_alpha2[1] == '7') 283 return false; 284 285 /* This would indicate a mistake on the design */ 286 if (WARN((!is_world_regdom(user_alpha2) && 287 !is_an_alpha2(user_alpha2)), 288 "Unexpected user alpha2: %c%c\n", 289 user_alpha2[0], 290 user_alpha2[1])) 291 return false; 292 293 return true; 294 } 295 296 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, 297 const struct ieee80211_regdomain *src_regd) 298 { 299 struct ieee80211_regdomain *regd; 300 int size_of_regd = 0; 301 unsigned int i; 302 303 size_of_regd = sizeof(struct ieee80211_regdomain) + 304 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); 305 306 regd = kzalloc(size_of_regd, GFP_KERNEL); 307 if (!regd) 308 return -ENOMEM; 309 310 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); 311 312 for (i = 0; i < src_regd->n_reg_rules; i++) 313 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], 314 sizeof(struct ieee80211_reg_rule)); 315 316 *dst_regd = regd; 317 return 0; 318 } 319 320 #ifdef CONFIG_CFG80211_INTERNAL_REGDB 321 struct reg_regdb_search_request { 322 char alpha2[2]; 323 struct list_head list; 324 }; 325 326 static LIST_HEAD(reg_regdb_search_list); 327 static DEFINE_MUTEX(reg_regdb_search_mutex); 328 329 static void reg_regdb_search(struct work_struct *work) 330 { 331 struct reg_regdb_search_request *request; 332 const struct ieee80211_regdomain *curdom, *regdom; 333 int i, r; 334 335 mutex_lock(®_regdb_search_mutex); 336 while (!list_empty(®_regdb_search_list)) { 337 request = list_first_entry(®_regdb_search_list, 338 struct reg_regdb_search_request, 339 list); 340 list_del(&request->list); 341 342 for (i=0; i<reg_regdb_size; i++) { 343 curdom = reg_regdb[i]; 344 345 if (!memcmp(request->alpha2, curdom->alpha2, 2)) { 346 r = reg_copy_regd(®dom, curdom); 347 if (r) 348 break; 349 mutex_lock(&cfg80211_mutex); 350 set_regdom(regdom); 351 mutex_unlock(&cfg80211_mutex); 352 break; 353 } 354 } 355 356 kfree(request); 357 } 358 mutex_unlock(®_regdb_search_mutex); 359 } 360 361 static DECLARE_WORK(reg_regdb_work, reg_regdb_search); 362 363 static void reg_regdb_query(const char *alpha2) 364 { 365 struct reg_regdb_search_request *request; 366 367 if (!alpha2) 368 return; 369 370 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL); 371 if (!request) 372 return; 373 374 memcpy(request->alpha2, alpha2, 2); 375 376 mutex_lock(®_regdb_search_mutex); 377 list_add_tail(&request->list, ®_regdb_search_list); 378 mutex_unlock(®_regdb_search_mutex); 379 380 schedule_work(®_regdb_work); 381 } 382 #else 383 static inline void reg_regdb_query(const char *alpha2) {} 384 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */ 385 386 /* 387 * This lets us keep regulatory code which is updated on a regulatory 388 * basis in userspace. Country information is filled in by 389 * reg_device_uevent 390 */ 391 static int call_crda(const char *alpha2) 392 { 393 if (!is_world_regdom((char *) alpha2)) 394 pr_info("Calling CRDA for country: %c%c\n", 395 alpha2[0], alpha2[1]); 396 else 397 pr_info("Calling CRDA to update world regulatory domain\n"); 398 399 /* query internal regulatory database (if it exists) */ 400 reg_regdb_query(alpha2); 401 402 return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE); 403 } 404 405 /* Used by nl80211 before kmalloc'ing our regulatory domain */ 406 bool reg_is_valid_request(const char *alpha2) 407 { 408 assert_cfg80211_lock(); 409 410 if (!last_request) 411 return false; 412 413 return alpha2_equal(last_request->alpha2, alpha2); 414 } 415 416 /* Sanity check on a regulatory rule */ 417 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) 418 { 419 const struct ieee80211_freq_range *freq_range = &rule->freq_range; 420 u32 freq_diff; 421 422 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) 423 return false; 424 425 if (freq_range->start_freq_khz > freq_range->end_freq_khz) 426 return false; 427 428 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; 429 430 if (freq_range->end_freq_khz <= freq_range->start_freq_khz || 431 freq_range->max_bandwidth_khz > freq_diff) 432 return false; 433 434 return true; 435 } 436 437 static bool is_valid_rd(const struct ieee80211_regdomain *rd) 438 { 439 const struct ieee80211_reg_rule *reg_rule = NULL; 440 unsigned int i; 441 442 if (!rd->n_reg_rules) 443 return false; 444 445 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) 446 return false; 447 448 for (i = 0; i < rd->n_reg_rules; i++) { 449 reg_rule = &rd->reg_rules[i]; 450 if (!is_valid_reg_rule(reg_rule)) 451 return false; 452 } 453 454 return true; 455 } 456 457 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, 458 u32 center_freq_khz, 459 u32 bw_khz) 460 { 461 u32 start_freq_khz, end_freq_khz; 462 463 start_freq_khz = center_freq_khz - (bw_khz/2); 464 end_freq_khz = center_freq_khz + (bw_khz/2); 465 466 if (start_freq_khz >= freq_range->start_freq_khz && 467 end_freq_khz <= freq_range->end_freq_khz) 468 return true; 469 470 return false; 471 } 472 473 /** 474 * freq_in_rule_band - tells us if a frequency is in a frequency band 475 * @freq_range: frequency rule we want to query 476 * @freq_khz: frequency we are inquiring about 477 * 478 * This lets us know if a specific frequency rule is or is not relevant to 479 * a specific frequency's band. Bands are device specific and artificial 480 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is 481 * safe for now to assume that a frequency rule should not be part of a 482 * frequency's band if the start freq or end freq are off by more than 2 GHz. 483 * This resolution can be lowered and should be considered as we add 484 * regulatory rule support for other "bands". 485 **/ 486 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, 487 u32 freq_khz) 488 { 489 #define ONE_GHZ_IN_KHZ 1000000 490 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) 491 return true; 492 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) 493 return true; 494 return false; 495 #undef ONE_GHZ_IN_KHZ 496 } 497 498 /* 499 * Helper for regdom_intersect(), this does the real 500 * mathematical intersection fun 501 */ 502 static int reg_rules_intersect( 503 const struct ieee80211_reg_rule *rule1, 504 const struct ieee80211_reg_rule *rule2, 505 struct ieee80211_reg_rule *intersected_rule) 506 { 507 const struct ieee80211_freq_range *freq_range1, *freq_range2; 508 struct ieee80211_freq_range *freq_range; 509 const struct ieee80211_power_rule *power_rule1, *power_rule2; 510 struct ieee80211_power_rule *power_rule; 511 u32 freq_diff; 512 513 freq_range1 = &rule1->freq_range; 514 freq_range2 = &rule2->freq_range; 515 freq_range = &intersected_rule->freq_range; 516 517 power_rule1 = &rule1->power_rule; 518 power_rule2 = &rule2->power_rule; 519 power_rule = &intersected_rule->power_rule; 520 521 freq_range->start_freq_khz = max(freq_range1->start_freq_khz, 522 freq_range2->start_freq_khz); 523 freq_range->end_freq_khz = min(freq_range1->end_freq_khz, 524 freq_range2->end_freq_khz); 525 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, 526 freq_range2->max_bandwidth_khz); 527 528 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; 529 if (freq_range->max_bandwidth_khz > freq_diff) 530 freq_range->max_bandwidth_khz = freq_diff; 531 532 power_rule->max_eirp = min(power_rule1->max_eirp, 533 power_rule2->max_eirp); 534 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, 535 power_rule2->max_antenna_gain); 536 537 intersected_rule->flags = (rule1->flags | rule2->flags); 538 539 if (!is_valid_reg_rule(intersected_rule)) 540 return -EINVAL; 541 542 return 0; 543 } 544 545 /** 546 * regdom_intersect - do the intersection between two regulatory domains 547 * @rd1: first regulatory domain 548 * @rd2: second regulatory domain 549 * 550 * Use this function to get the intersection between two regulatory domains. 551 * Once completed we will mark the alpha2 for the rd as intersected, "98", 552 * as no one single alpha2 can represent this regulatory domain. 553 * 554 * Returns a pointer to the regulatory domain structure which will hold the 555 * resulting intersection of rules between rd1 and rd2. We will 556 * kzalloc() this structure for you. 557 */ 558 static struct ieee80211_regdomain *regdom_intersect( 559 const struct ieee80211_regdomain *rd1, 560 const struct ieee80211_regdomain *rd2) 561 { 562 int r, size_of_regd; 563 unsigned int x, y; 564 unsigned int num_rules = 0, rule_idx = 0; 565 const struct ieee80211_reg_rule *rule1, *rule2; 566 struct ieee80211_reg_rule *intersected_rule; 567 struct ieee80211_regdomain *rd; 568 /* This is just a dummy holder to help us count */ 569 struct ieee80211_reg_rule irule; 570 571 /* Uses the stack temporarily for counter arithmetic */ 572 intersected_rule = &irule; 573 574 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); 575 576 if (!rd1 || !rd2) 577 return NULL; 578 579 /* 580 * First we get a count of the rules we'll need, then we actually 581 * build them. This is to so we can malloc() and free() a 582 * regdomain once. The reason we use reg_rules_intersect() here 583 * is it will return -EINVAL if the rule computed makes no sense. 584 * All rules that do check out OK are valid. 585 */ 586 587 for (x = 0; x < rd1->n_reg_rules; x++) { 588 rule1 = &rd1->reg_rules[x]; 589 for (y = 0; y < rd2->n_reg_rules; y++) { 590 rule2 = &rd2->reg_rules[y]; 591 if (!reg_rules_intersect(rule1, rule2, 592 intersected_rule)) 593 num_rules++; 594 memset(intersected_rule, 0, 595 sizeof(struct ieee80211_reg_rule)); 596 } 597 } 598 599 if (!num_rules) 600 return NULL; 601 602 size_of_regd = sizeof(struct ieee80211_regdomain) + 603 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); 604 605 rd = kzalloc(size_of_regd, GFP_KERNEL); 606 if (!rd) 607 return NULL; 608 609 for (x = 0; x < rd1->n_reg_rules; x++) { 610 rule1 = &rd1->reg_rules[x]; 611 for (y = 0; y < rd2->n_reg_rules; y++) { 612 rule2 = &rd2->reg_rules[y]; 613 /* 614 * This time around instead of using the stack lets 615 * write to the target rule directly saving ourselves 616 * a memcpy() 617 */ 618 intersected_rule = &rd->reg_rules[rule_idx]; 619 r = reg_rules_intersect(rule1, rule2, 620 intersected_rule); 621 /* 622 * No need to memset here the intersected rule here as 623 * we're not using the stack anymore 624 */ 625 if (r) 626 continue; 627 rule_idx++; 628 } 629 } 630 631 if (rule_idx != num_rules) { 632 kfree(rd); 633 return NULL; 634 } 635 636 rd->n_reg_rules = num_rules; 637 rd->alpha2[0] = '9'; 638 rd->alpha2[1] = '8'; 639 640 return rd; 641 } 642 643 /* 644 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may 645 * want to just have the channel structure use these 646 */ 647 static u32 map_regdom_flags(u32 rd_flags) 648 { 649 u32 channel_flags = 0; 650 if (rd_flags & NL80211_RRF_PASSIVE_SCAN) 651 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; 652 if (rd_flags & NL80211_RRF_NO_IBSS) 653 channel_flags |= IEEE80211_CHAN_NO_IBSS; 654 if (rd_flags & NL80211_RRF_DFS) 655 channel_flags |= IEEE80211_CHAN_RADAR; 656 return channel_flags; 657 } 658 659 static int freq_reg_info_regd(struct wiphy *wiphy, 660 u32 center_freq, 661 u32 desired_bw_khz, 662 const struct ieee80211_reg_rule **reg_rule, 663 const struct ieee80211_regdomain *custom_regd) 664 { 665 int i; 666 bool band_rule_found = false; 667 const struct ieee80211_regdomain *regd; 668 bool bw_fits = false; 669 670 if (!desired_bw_khz) 671 desired_bw_khz = MHZ_TO_KHZ(20); 672 673 regd = custom_regd ? custom_regd : cfg80211_regdomain; 674 675 /* 676 * Follow the driver's regulatory domain, if present, unless a country 677 * IE has been processed or a user wants to help complaince further 678 */ 679 if (!custom_regd && 680 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && 681 last_request->initiator != NL80211_REGDOM_SET_BY_USER && 682 wiphy->regd) 683 regd = wiphy->regd; 684 685 if (!regd) 686 return -EINVAL; 687 688 for (i = 0; i < regd->n_reg_rules; i++) { 689 const struct ieee80211_reg_rule *rr; 690 const struct ieee80211_freq_range *fr = NULL; 691 692 rr = ®d->reg_rules[i]; 693 fr = &rr->freq_range; 694 695 /* 696 * We only need to know if one frequency rule was 697 * was in center_freq's band, that's enough, so lets 698 * not overwrite it once found 699 */ 700 if (!band_rule_found) 701 band_rule_found = freq_in_rule_band(fr, center_freq); 702 703 bw_fits = reg_does_bw_fit(fr, 704 center_freq, 705 desired_bw_khz); 706 707 if (band_rule_found && bw_fits) { 708 *reg_rule = rr; 709 return 0; 710 } 711 } 712 713 if (!band_rule_found) 714 return -ERANGE; 715 716 return -EINVAL; 717 } 718 719 int freq_reg_info(struct wiphy *wiphy, 720 u32 center_freq, 721 u32 desired_bw_khz, 722 const struct ieee80211_reg_rule **reg_rule) 723 { 724 assert_cfg80211_lock(); 725 return freq_reg_info_regd(wiphy, 726 center_freq, 727 desired_bw_khz, 728 reg_rule, 729 NULL); 730 } 731 EXPORT_SYMBOL(freq_reg_info); 732 733 #ifdef CONFIG_CFG80211_REG_DEBUG 734 static const char *reg_initiator_name(enum nl80211_reg_initiator initiator) 735 { 736 switch (initiator) { 737 case NL80211_REGDOM_SET_BY_CORE: 738 return "Set by core"; 739 case NL80211_REGDOM_SET_BY_USER: 740 return "Set by user"; 741 case NL80211_REGDOM_SET_BY_DRIVER: 742 return "Set by driver"; 743 case NL80211_REGDOM_SET_BY_COUNTRY_IE: 744 return "Set by country IE"; 745 default: 746 WARN_ON(1); 747 return "Set by bug"; 748 } 749 } 750 751 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, 752 u32 desired_bw_khz, 753 const struct ieee80211_reg_rule *reg_rule) 754 { 755 const struct ieee80211_power_rule *power_rule; 756 const struct ieee80211_freq_range *freq_range; 757 char max_antenna_gain[32]; 758 759 power_rule = ®_rule->power_rule; 760 freq_range = ®_rule->freq_range; 761 762 if (!power_rule->max_antenna_gain) 763 snprintf(max_antenna_gain, 32, "N/A"); 764 else 765 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain); 766 767 REG_DBG_PRINT("Updating information on frequency %d MHz " 768 "for a %d MHz width channel with regulatory rule:\n", 769 chan->center_freq, 770 KHZ_TO_MHZ(desired_bw_khz)); 771 772 REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n", 773 freq_range->start_freq_khz, 774 freq_range->end_freq_khz, 775 freq_range->max_bandwidth_khz, 776 max_antenna_gain, 777 power_rule->max_eirp); 778 } 779 #else 780 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, 781 u32 desired_bw_khz, 782 const struct ieee80211_reg_rule *reg_rule) 783 { 784 return; 785 } 786 #endif 787 788 /* 789 * Note that right now we assume the desired channel bandwidth 790 * is always 20 MHz for each individual channel (HT40 uses 20 MHz 791 * per channel, the primary and the extension channel). To support 792 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a 793 * new ieee80211_channel.target_bw and re run the regulatory check 794 * on the wiphy with the target_bw specified. Then we can simply use 795 * that below for the desired_bw_khz below. 796 */ 797 static void handle_channel(struct wiphy *wiphy, 798 enum nl80211_reg_initiator initiator, 799 enum ieee80211_band band, 800 unsigned int chan_idx) 801 { 802 int r; 803 u32 flags, bw_flags = 0; 804 u32 desired_bw_khz = MHZ_TO_KHZ(20); 805 const struct ieee80211_reg_rule *reg_rule = NULL; 806 const struct ieee80211_power_rule *power_rule = NULL; 807 const struct ieee80211_freq_range *freq_range = NULL; 808 struct ieee80211_supported_band *sband; 809 struct ieee80211_channel *chan; 810 struct wiphy *request_wiphy = NULL; 811 812 assert_cfg80211_lock(); 813 814 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 815 816 sband = wiphy->bands[band]; 817 BUG_ON(chan_idx >= sband->n_channels); 818 chan = &sband->channels[chan_idx]; 819 820 flags = chan->orig_flags; 821 822 r = freq_reg_info(wiphy, 823 MHZ_TO_KHZ(chan->center_freq), 824 desired_bw_khz, 825 ®_rule); 826 827 if (r) { 828 /* 829 * We will disable all channels that do not match our 830 * received regulatory rule unless the hint is coming 831 * from a Country IE and the Country IE had no information 832 * about a band. The IEEE 802.11 spec allows for an AP 833 * to send only a subset of the regulatory rules allowed, 834 * so an AP in the US that only supports 2.4 GHz may only send 835 * a country IE with information for the 2.4 GHz band 836 * while 5 GHz is still supported. 837 */ 838 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && 839 r == -ERANGE) 840 return; 841 842 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq); 843 chan->flags = IEEE80211_CHAN_DISABLED; 844 return; 845 } 846 847 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); 848 849 power_rule = ®_rule->power_rule; 850 freq_range = ®_rule->freq_range; 851 852 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) 853 bw_flags = IEEE80211_CHAN_NO_HT40; 854 855 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && 856 request_wiphy && request_wiphy == wiphy && 857 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { 858 /* 859 * This guarantees the driver's requested regulatory domain 860 * will always be used as a base for further regulatory 861 * settings 862 */ 863 chan->flags = chan->orig_flags = 864 map_regdom_flags(reg_rule->flags) | bw_flags; 865 chan->max_antenna_gain = chan->orig_mag = 866 (int) MBI_TO_DBI(power_rule->max_antenna_gain); 867 chan->max_power = chan->orig_mpwr = 868 (int) MBM_TO_DBM(power_rule->max_eirp); 869 return; 870 } 871 872 chan->beacon_found = false; 873 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); 874 chan->max_antenna_gain = min(chan->orig_mag, 875 (int) MBI_TO_DBI(power_rule->max_antenna_gain)); 876 if (chan->orig_mpwr) 877 chan->max_power = min(chan->orig_mpwr, 878 (int) MBM_TO_DBM(power_rule->max_eirp)); 879 else 880 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); 881 } 882 883 static void handle_band(struct wiphy *wiphy, 884 enum ieee80211_band band, 885 enum nl80211_reg_initiator initiator) 886 { 887 unsigned int i; 888 struct ieee80211_supported_band *sband; 889 890 BUG_ON(!wiphy->bands[band]); 891 sband = wiphy->bands[band]; 892 893 for (i = 0; i < sband->n_channels; i++) 894 handle_channel(wiphy, initiator, band, i); 895 } 896 897 static bool ignore_reg_update(struct wiphy *wiphy, 898 enum nl80211_reg_initiator initiator) 899 { 900 if (!last_request) { 901 REG_DBG_PRINT("Ignoring regulatory request %s since " 902 "last_request is not set\n", 903 reg_initiator_name(initiator)); 904 return true; 905 } 906 907 if (initiator == NL80211_REGDOM_SET_BY_CORE && 908 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 909 REG_DBG_PRINT("Ignoring regulatory request %s " 910 "since the driver uses its own custom " 911 "regulatory domain\n", 912 reg_initiator_name(initiator)); 913 return true; 914 } 915 916 /* 917 * wiphy->regd will be set once the device has its own 918 * desired regulatory domain set 919 */ 920 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && 921 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && 922 !is_world_regdom(last_request->alpha2)) { 923 REG_DBG_PRINT("Ignoring regulatory request %s " 924 "since the driver requires its own regulatory " 925 "domain to be set first\n", 926 reg_initiator_name(initiator)); 927 return true; 928 } 929 930 return false; 931 } 932 933 static void handle_reg_beacon(struct wiphy *wiphy, 934 unsigned int chan_idx, 935 struct reg_beacon *reg_beacon) 936 { 937 struct ieee80211_supported_band *sband; 938 struct ieee80211_channel *chan; 939 bool channel_changed = false; 940 struct ieee80211_channel chan_before; 941 942 assert_cfg80211_lock(); 943 944 sband = wiphy->bands[reg_beacon->chan.band]; 945 chan = &sband->channels[chan_idx]; 946 947 if (likely(chan->center_freq != reg_beacon->chan.center_freq)) 948 return; 949 950 if (chan->beacon_found) 951 return; 952 953 chan->beacon_found = true; 954 955 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) 956 return; 957 958 chan_before.center_freq = chan->center_freq; 959 chan_before.flags = chan->flags; 960 961 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { 962 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; 963 channel_changed = true; 964 } 965 966 if (chan->flags & IEEE80211_CHAN_NO_IBSS) { 967 chan->flags &= ~IEEE80211_CHAN_NO_IBSS; 968 channel_changed = true; 969 } 970 971 if (channel_changed) 972 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); 973 } 974 975 /* 976 * Called when a scan on a wiphy finds a beacon on 977 * new channel 978 */ 979 static void wiphy_update_new_beacon(struct wiphy *wiphy, 980 struct reg_beacon *reg_beacon) 981 { 982 unsigned int i; 983 struct ieee80211_supported_band *sband; 984 985 assert_cfg80211_lock(); 986 987 if (!wiphy->bands[reg_beacon->chan.band]) 988 return; 989 990 sband = wiphy->bands[reg_beacon->chan.band]; 991 992 for (i = 0; i < sband->n_channels; i++) 993 handle_reg_beacon(wiphy, i, reg_beacon); 994 } 995 996 /* 997 * Called upon reg changes or a new wiphy is added 998 */ 999 static void wiphy_update_beacon_reg(struct wiphy *wiphy) 1000 { 1001 unsigned int i; 1002 struct ieee80211_supported_band *sband; 1003 struct reg_beacon *reg_beacon; 1004 1005 assert_cfg80211_lock(); 1006 1007 if (list_empty(®_beacon_list)) 1008 return; 1009 1010 list_for_each_entry(reg_beacon, ®_beacon_list, list) { 1011 if (!wiphy->bands[reg_beacon->chan.band]) 1012 continue; 1013 sband = wiphy->bands[reg_beacon->chan.band]; 1014 for (i = 0; i < sband->n_channels; i++) 1015 handle_reg_beacon(wiphy, i, reg_beacon); 1016 } 1017 } 1018 1019 static bool reg_is_world_roaming(struct wiphy *wiphy) 1020 { 1021 if (is_world_regdom(cfg80211_regdomain->alpha2) || 1022 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) 1023 return true; 1024 if (last_request && 1025 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && 1026 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) 1027 return true; 1028 return false; 1029 } 1030 1031 /* Reap the advantages of previously found beacons */ 1032 static void reg_process_beacons(struct wiphy *wiphy) 1033 { 1034 /* 1035 * Means we are just firing up cfg80211, so no beacons would 1036 * have been processed yet. 1037 */ 1038 if (!last_request) 1039 return; 1040 if (!reg_is_world_roaming(wiphy)) 1041 return; 1042 wiphy_update_beacon_reg(wiphy); 1043 } 1044 1045 static bool is_ht40_not_allowed(struct ieee80211_channel *chan) 1046 { 1047 if (!chan) 1048 return true; 1049 if (chan->flags & IEEE80211_CHAN_DISABLED) 1050 return true; 1051 /* This would happen when regulatory rules disallow HT40 completely */ 1052 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) 1053 return true; 1054 return false; 1055 } 1056 1057 static void reg_process_ht_flags_channel(struct wiphy *wiphy, 1058 enum ieee80211_band band, 1059 unsigned int chan_idx) 1060 { 1061 struct ieee80211_supported_band *sband; 1062 struct ieee80211_channel *channel; 1063 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; 1064 unsigned int i; 1065 1066 assert_cfg80211_lock(); 1067 1068 sband = wiphy->bands[band]; 1069 BUG_ON(chan_idx >= sband->n_channels); 1070 channel = &sband->channels[chan_idx]; 1071 1072 if (is_ht40_not_allowed(channel)) { 1073 channel->flags |= IEEE80211_CHAN_NO_HT40; 1074 return; 1075 } 1076 1077 /* 1078 * We need to ensure the extension channels exist to 1079 * be able to use HT40- or HT40+, this finds them (or not) 1080 */ 1081 for (i = 0; i < sband->n_channels; i++) { 1082 struct ieee80211_channel *c = &sband->channels[i]; 1083 if (c->center_freq == (channel->center_freq - 20)) 1084 channel_before = c; 1085 if (c->center_freq == (channel->center_freq + 20)) 1086 channel_after = c; 1087 } 1088 1089 /* 1090 * Please note that this assumes target bandwidth is 20 MHz, 1091 * if that ever changes we also need to change the below logic 1092 * to include that as well. 1093 */ 1094 if (is_ht40_not_allowed(channel_before)) 1095 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; 1096 else 1097 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; 1098 1099 if (is_ht40_not_allowed(channel_after)) 1100 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; 1101 else 1102 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; 1103 } 1104 1105 static void reg_process_ht_flags_band(struct wiphy *wiphy, 1106 enum ieee80211_band band) 1107 { 1108 unsigned int i; 1109 struct ieee80211_supported_band *sband; 1110 1111 BUG_ON(!wiphy->bands[band]); 1112 sband = wiphy->bands[band]; 1113 1114 for (i = 0; i < sband->n_channels; i++) 1115 reg_process_ht_flags_channel(wiphy, band, i); 1116 } 1117 1118 static void reg_process_ht_flags(struct wiphy *wiphy) 1119 { 1120 enum ieee80211_band band; 1121 1122 if (!wiphy) 1123 return; 1124 1125 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1126 if (wiphy->bands[band]) 1127 reg_process_ht_flags_band(wiphy, band); 1128 } 1129 1130 } 1131 1132 static void wiphy_update_regulatory(struct wiphy *wiphy, 1133 enum nl80211_reg_initiator initiator) 1134 { 1135 enum ieee80211_band band; 1136 1137 assert_reg_lock(); 1138 1139 if (ignore_reg_update(wiphy, initiator)) 1140 return; 1141 1142 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1143 if (wiphy->bands[band]) 1144 handle_band(wiphy, band, initiator); 1145 } 1146 1147 reg_process_beacons(wiphy); 1148 reg_process_ht_flags(wiphy); 1149 if (wiphy->reg_notifier) 1150 wiphy->reg_notifier(wiphy, last_request); 1151 } 1152 1153 void regulatory_update(struct wiphy *wiphy, 1154 enum nl80211_reg_initiator setby) 1155 { 1156 mutex_lock(®_mutex); 1157 wiphy_update_regulatory(wiphy, setby); 1158 mutex_unlock(®_mutex); 1159 } 1160 1161 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) 1162 { 1163 struct cfg80211_registered_device *rdev; 1164 1165 list_for_each_entry(rdev, &cfg80211_rdev_list, list) 1166 wiphy_update_regulatory(&rdev->wiphy, initiator); 1167 } 1168 1169 static void handle_channel_custom(struct wiphy *wiphy, 1170 enum ieee80211_band band, 1171 unsigned int chan_idx, 1172 const struct ieee80211_regdomain *regd) 1173 { 1174 int r; 1175 u32 desired_bw_khz = MHZ_TO_KHZ(20); 1176 u32 bw_flags = 0; 1177 const struct ieee80211_reg_rule *reg_rule = NULL; 1178 const struct ieee80211_power_rule *power_rule = NULL; 1179 const struct ieee80211_freq_range *freq_range = NULL; 1180 struct ieee80211_supported_band *sband; 1181 struct ieee80211_channel *chan; 1182 1183 assert_reg_lock(); 1184 1185 sband = wiphy->bands[band]; 1186 BUG_ON(chan_idx >= sband->n_channels); 1187 chan = &sband->channels[chan_idx]; 1188 1189 r = freq_reg_info_regd(wiphy, 1190 MHZ_TO_KHZ(chan->center_freq), 1191 desired_bw_khz, 1192 ®_rule, 1193 regd); 1194 1195 if (r) { 1196 REG_DBG_PRINT("Disabling freq %d MHz as custom " 1197 "regd has no rule that fits a %d MHz " 1198 "wide channel\n", 1199 chan->center_freq, 1200 KHZ_TO_MHZ(desired_bw_khz)); 1201 chan->flags = IEEE80211_CHAN_DISABLED; 1202 return; 1203 } 1204 1205 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); 1206 1207 power_rule = ®_rule->power_rule; 1208 freq_range = ®_rule->freq_range; 1209 1210 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) 1211 bw_flags = IEEE80211_CHAN_NO_HT40; 1212 1213 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; 1214 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); 1215 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); 1216 } 1217 1218 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, 1219 const struct ieee80211_regdomain *regd) 1220 { 1221 unsigned int i; 1222 struct ieee80211_supported_band *sband; 1223 1224 BUG_ON(!wiphy->bands[band]); 1225 sband = wiphy->bands[band]; 1226 1227 for (i = 0; i < sband->n_channels; i++) 1228 handle_channel_custom(wiphy, band, i, regd); 1229 } 1230 1231 /* Used by drivers prior to wiphy registration */ 1232 void wiphy_apply_custom_regulatory(struct wiphy *wiphy, 1233 const struct ieee80211_regdomain *regd) 1234 { 1235 enum ieee80211_band band; 1236 unsigned int bands_set = 0; 1237 1238 mutex_lock(®_mutex); 1239 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1240 if (!wiphy->bands[band]) 1241 continue; 1242 handle_band_custom(wiphy, band, regd); 1243 bands_set++; 1244 } 1245 mutex_unlock(®_mutex); 1246 1247 /* 1248 * no point in calling this if it won't have any effect 1249 * on your device's supportd bands. 1250 */ 1251 WARN_ON(!bands_set); 1252 } 1253 EXPORT_SYMBOL(wiphy_apply_custom_regulatory); 1254 1255 /* 1256 * Return value which can be used by ignore_request() to indicate 1257 * it has been determined we should intersect two regulatory domains 1258 */ 1259 #define REG_INTERSECT 1 1260 1261 /* This has the logic which determines when a new request 1262 * should be ignored. */ 1263 static int ignore_request(struct wiphy *wiphy, 1264 struct regulatory_request *pending_request) 1265 { 1266 struct wiphy *last_wiphy = NULL; 1267 1268 assert_cfg80211_lock(); 1269 1270 /* All initial requests are respected */ 1271 if (!last_request) 1272 return 0; 1273 1274 switch (pending_request->initiator) { 1275 case NL80211_REGDOM_SET_BY_CORE: 1276 return 0; 1277 case NL80211_REGDOM_SET_BY_COUNTRY_IE: 1278 1279 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 1280 1281 if (unlikely(!is_an_alpha2(pending_request->alpha2))) 1282 return -EINVAL; 1283 if (last_request->initiator == 1284 NL80211_REGDOM_SET_BY_COUNTRY_IE) { 1285 if (last_wiphy != wiphy) { 1286 /* 1287 * Two cards with two APs claiming different 1288 * Country IE alpha2s. We could 1289 * intersect them, but that seems unlikely 1290 * to be correct. Reject second one for now. 1291 */ 1292 if (regdom_changes(pending_request->alpha2)) 1293 return -EOPNOTSUPP; 1294 return -EALREADY; 1295 } 1296 /* 1297 * Two consecutive Country IE hints on the same wiphy. 1298 * This should be picked up early by the driver/stack 1299 */ 1300 if (WARN_ON(regdom_changes(pending_request->alpha2))) 1301 return 0; 1302 return -EALREADY; 1303 } 1304 return 0; 1305 case NL80211_REGDOM_SET_BY_DRIVER: 1306 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { 1307 if (regdom_changes(pending_request->alpha2)) 1308 return 0; 1309 return -EALREADY; 1310 } 1311 1312 /* 1313 * This would happen if you unplug and plug your card 1314 * back in or if you add a new device for which the previously 1315 * loaded card also agrees on the regulatory domain. 1316 */ 1317 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && 1318 !regdom_changes(pending_request->alpha2)) 1319 return -EALREADY; 1320 1321 return REG_INTERSECT; 1322 case NL80211_REGDOM_SET_BY_USER: 1323 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) 1324 return REG_INTERSECT; 1325 /* 1326 * If the user knows better the user should set the regdom 1327 * to their country before the IE is picked up 1328 */ 1329 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && 1330 last_request->intersect) 1331 return -EOPNOTSUPP; 1332 /* 1333 * Process user requests only after previous user/driver/core 1334 * requests have been processed 1335 */ 1336 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || 1337 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || 1338 last_request->initiator == NL80211_REGDOM_SET_BY_USER) { 1339 if (regdom_changes(last_request->alpha2)) 1340 return -EAGAIN; 1341 } 1342 1343 if (!regdom_changes(pending_request->alpha2)) 1344 return -EALREADY; 1345 1346 return 0; 1347 } 1348 1349 return -EINVAL; 1350 } 1351 1352 static void reg_set_request_processed(void) 1353 { 1354 bool need_more_processing = false; 1355 1356 last_request->processed = true; 1357 1358 spin_lock(®_requests_lock); 1359 if (!list_empty(®_requests_list)) 1360 need_more_processing = true; 1361 spin_unlock(®_requests_lock); 1362 1363 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) 1364 cancel_delayed_work_sync(®_timeout); 1365 1366 if (need_more_processing) 1367 schedule_work(®_work); 1368 } 1369 1370 /** 1371 * __regulatory_hint - hint to the wireless core a regulatory domain 1372 * @wiphy: if the hint comes from country information from an AP, this 1373 * is required to be set to the wiphy that received the information 1374 * @pending_request: the regulatory request currently being processed 1375 * 1376 * The Wireless subsystem can use this function to hint to the wireless core 1377 * what it believes should be the current regulatory domain. 1378 * 1379 * Returns zero if all went fine, %-EALREADY if a regulatory domain had 1380 * already been set or other standard error codes. 1381 * 1382 * Caller must hold &cfg80211_mutex and ®_mutex 1383 */ 1384 static int __regulatory_hint(struct wiphy *wiphy, 1385 struct regulatory_request *pending_request) 1386 { 1387 bool intersect = false; 1388 int r = 0; 1389 1390 assert_cfg80211_lock(); 1391 1392 r = ignore_request(wiphy, pending_request); 1393 1394 if (r == REG_INTERSECT) { 1395 if (pending_request->initiator == 1396 NL80211_REGDOM_SET_BY_DRIVER) { 1397 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); 1398 if (r) { 1399 kfree(pending_request); 1400 return r; 1401 } 1402 } 1403 intersect = true; 1404 } else if (r) { 1405 /* 1406 * If the regulatory domain being requested by the 1407 * driver has already been set just copy it to the 1408 * wiphy 1409 */ 1410 if (r == -EALREADY && 1411 pending_request->initiator == 1412 NL80211_REGDOM_SET_BY_DRIVER) { 1413 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); 1414 if (r) { 1415 kfree(pending_request); 1416 return r; 1417 } 1418 r = -EALREADY; 1419 goto new_request; 1420 } 1421 kfree(pending_request); 1422 return r; 1423 } 1424 1425 new_request: 1426 if (last_request != &core_request_world) 1427 kfree(last_request); 1428 1429 last_request = pending_request; 1430 last_request->intersect = intersect; 1431 1432 pending_request = NULL; 1433 1434 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) { 1435 user_alpha2[0] = last_request->alpha2[0]; 1436 user_alpha2[1] = last_request->alpha2[1]; 1437 } 1438 1439 /* When r == REG_INTERSECT we do need to call CRDA */ 1440 if (r < 0) { 1441 /* 1442 * Since CRDA will not be called in this case as we already 1443 * have applied the requested regulatory domain before we just 1444 * inform userspace we have processed the request 1445 */ 1446 if (r == -EALREADY) { 1447 nl80211_send_reg_change_event(last_request); 1448 reg_set_request_processed(); 1449 } 1450 return r; 1451 } 1452 1453 return call_crda(last_request->alpha2); 1454 } 1455 1456 /* This processes *all* regulatory hints */ 1457 static void reg_process_hint(struct regulatory_request *reg_request) 1458 { 1459 int r = 0; 1460 struct wiphy *wiphy = NULL; 1461 enum nl80211_reg_initiator initiator = reg_request->initiator; 1462 1463 BUG_ON(!reg_request->alpha2); 1464 1465 if (wiphy_idx_valid(reg_request->wiphy_idx)) 1466 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); 1467 1468 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && 1469 !wiphy) { 1470 kfree(reg_request); 1471 return; 1472 } 1473 1474 r = __regulatory_hint(wiphy, reg_request); 1475 /* This is required so that the orig_* parameters are saved */ 1476 if (r == -EALREADY && wiphy && 1477 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { 1478 wiphy_update_regulatory(wiphy, initiator); 1479 return; 1480 } 1481 1482 /* 1483 * We only time out user hints, given that they should be the only 1484 * source of bogus requests. 1485 */ 1486 if (r != -EALREADY && 1487 reg_request->initiator == NL80211_REGDOM_SET_BY_USER) 1488 schedule_delayed_work(®_timeout, msecs_to_jiffies(3142)); 1489 } 1490 1491 /* 1492 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* 1493 * Regulatory hints come on a first come first serve basis and we 1494 * must process each one atomically. 1495 */ 1496 static void reg_process_pending_hints(void) 1497 { 1498 struct regulatory_request *reg_request; 1499 1500 mutex_lock(&cfg80211_mutex); 1501 mutex_lock(®_mutex); 1502 1503 /* When last_request->processed becomes true this will be rescheduled */ 1504 if (last_request && !last_request->processed) { 1505 REG_DBG_PRINT("Pending regulatory request, waiting " 1506 "for it to be processed...\n"); 1507 goto out; 1508 } 1509 1510 spin_lock(®_requests_lock); 1511 1512 if (list_empty(®_requests_list)) { 1513 spin_unlock(®_requests_lock); 1514 goto out; 1515 } 1516 1517 reg_request = list_first_entry(®_requests_list, 1518 struct regulatory_request, 1519 list); 1520 list_del_init(®_request->list); 1521 1522 spin_unlock(®_requests_lock); 1523 1524 reg_process_hint(reg_request); 1525 1526 out: 1527 mutex_unlock(®_mutex); 1528 mutex_unlock(&cfg80211_mutex); 1529 } 1530 1531 /* Processes beacon hints -- this has nothing to do with country IEs */ 1532 static void reg_process_pending_beacon_hints(void) 1533 { 1534 struct cfg80211_registered_device *rdev; 1535 struct reg_beacon *pending_beacon, *tmp; 1536 1537 /* 1538 * No need to hold the reg_mutex here as we just touch wiphys 1539 * and do not read or access regulatory variables. 1540 */ 1541 mutex_lock(&cfg80211_mutex); 1542 1543 /* This goes through the _pending_ beacon list */ 1544 spin_lock_bh(®_pending_beacons_lock); 1545 1546 if (list_empty(®_pending_beacons)) { 1547 spin_unlock_bh(®_pending_beacons_lock); 1548 goto out; 1549 } 1550 1551 list_for_each_entry_safe(pending_beacon, tmp, 1552 ®_pending_beacons, list) { 1553 1554 list_del_init(&pending_beacon->list); 1555 1556 /* Applies the beacon hint to current wiphys */ 1557 list_for_each_entry(rdev, &cfg80211_rdev_list, list) 1558 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); 1559 1560 /* Remembers the beacon hint for new wiphys or reg changes */ 1561 list_add_tail(&pending_beacon->list, ®_beacon_list); 1562 } 1563 1564 spin_unlock_bh(®_pending_beacons_lock); 1565 out: 1566 mutex_unlock(&cfg80211_mutex); 1567 } 1568 1569 static void reg_todo(struct work_struct *work) 1570 { 1571 reg_process_pending_hints(); 1572 reg_process_pending_beacon_hints(); 1573 } 1574 1575 static void queue_regulatory_request(struct regulatory_request *request) 1576 { 1577 if (isalpha(request->alpha2[0])) 1578 request->alpha2[0] = toupper(request->alpha2[0]); 1579 if (isalpha(request->alpha2[1])) 1580 request->alpha2[1] = toupper(request->alpha2[1]); 1581 1582 spin_lock(®_requests_lock); 1583 list_add_tail(&request->list, ®_requests_list); 1584 spin_unlock(®_requests_lock); 1585 1586 schedule_work(®_work); 1587 } 1588 1589 /* 1590 * Core regulatory hint -- happens during cfg80211_init() 1591 * and when we restore regulatory settings. 1592 */ 1593 static int regulatory_hint_core(const char *alpha2) 1594 { 1595 struct regulatory_request *request; 1596 1597 request = kzalloc(sizeof(struct regulatory_request), 1598 GFP_KERNEL); 1599 if (!request) 1600 return -ENOMEM; 1601 1602 request->alpha2[0] = alpha2[0]; 1603 request->alpha2[1] = alpha2[1]; 1604 request->initiator = NL80211_REGDOM_SET_BY_CORE; 1605 1606 queue_regulatory_request(request); 1607 1608 return 0; 1609 } 1610 1611 /* User hints */ 1612 int regulatory_hint_user(const char *alpha2) 1613 { 1614 struct regulatory_request *request; 1615 1616 BUG_ON(!alpha2); 1617 1618 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); 1619 if (!request) 1620 return -ENOMEM; 1621 1622 request->wiphy_idx = WIPHY_IDX_STALE; 1623 request->alpha2[0] = alpha2[0]; 1624 request->alpha2[1] = alpha2[1]; 1625 request->initiator = NL80211_REGDOM_SET_BY_USER; 1626 1627 queue_regulatory_request(request); 1628 1629 return 0; 1630 } 1631 1632 /* Driver hints */ 1633 int regulatory_hint(struct wiphy *wiphy, const char *alpha2) 1634 { 1635 struct regulatory_request *request; 1636 1637 BUG_ON(!alpha2); 1638 BUG_ON(!wiphy); 1639 1640 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); 1641 if (!request) 1642 return -ENOMEM; 1643 1644 request->wiphy_idx = get_wiphy_idx(wiphy); 1645 1646 /* Must have registered wiphy first */ 1647 BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); 1648 1649 request->alpha2[0] = alpha2[0]; 1650 request->alpha2[1] = alpha2[1]; 1651 request->initiator = NL80211_REGDOM_SET_BY_DRIVER; 1652 1653 queue_regulatory_request(request); 1654 1655 return 0; 1656 } 1657 EXPORT_SYMBOL(regulatory_hint); 1658 1659 /* 1660 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and 1661 * therefore cannot iterate over the rdev list here. 1662 */ 1663 void regulatory_hint_11d(struct wiphy *wiphy, 1664 enum ieee80211_band band, 1665 u8 *country_ie, 1666 u8 country_ie_len) 1667 { 1668 char alpha2[2]; 1669 enum environment_cap env = ENVIRON_ANY; 1670 struct regulatory_request *request; 1671 1672 mutex_lock(®_mutex); 1673 1674 if (unlikely(!last_request)) 1675 goto out; 1676 1677 /* IE len must be evenly divisible by 2 */ 1678 if (country_ie_len & 0x01) 1679 goto out; 1680 1681 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1682 goto out; 1683 1684 alpha2[0] = country_ie[0]; 1685 alpha2[1] = country_ie[1]; 1686 1687 if (country_ie[2] == 'I') 1688 env = ENVIRON_INDOOR; 1689 else if (country_ie[2] == 'O') 1690 env = ENVIRON_OUTDOOR; 1691 1692 /* 1693 * We will run this only upon a successful connection on cfg80211. 1694 * We leave conflict resolution to the workqueue, where can hold 1695 * cfg80211_mutex. 1696 */ 1697 if (likely(last_request->initiator == 1698 NL80211_REGDOM_SET_BY_COUNTRY_IE && 1699 wiphy_idx_valid(last_request->wiphy_idx))) 1700 goto out; 1701 1702 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); 1703 if (!request) 1704 goto out; 1705 1706 request->wiphy_idx = get_wiphy_idx(wiphy); 1707 request->alpha2[0] = alpha2[0]; 1708 request->alpha2[1] = alpha2[1]; 1709 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; 1710 request->country_ie_env = env; 1711 1712 mutex_unlock(®_mutex); 1713 1714 queue_regulatory_request(request); 1715 1716 return; 1717 1718 out: 1719 mutex_unlock(®_mutex); 1720 } 1721 1722 static void restore_alpha2(char *alpha2, bool reset_user) 1723 { 1724 /* indicates there is no alpha2 to consider for restoration */ 1725 alpha2[0] = '9'; 1726 alpha2[1] = '7'; 1727 1728 /* The user setting has precedence over the module parameter */ 1729 if (is_user_regdom_saved()) { 1730 /* Unless we're asked to ignore it and reset it */ 1731 if (reset_user) { 1732 REG_DBG_PRINT("Restoring regulatory settings " 1733 "including user preference\n"); 1734 user_alpha2[0] = '9'; 1735 user_alpha2[1] = '7'; 1736 1737 /* 1738 * If we're ignoring user settings, we still need to 1739 * check the module parameter to ensure we put things 1740 * back as they were for a full restore. 1741 */ 1742 if (!is_world_regdom(ieee80211_regdom)) { 1743 REG_DBG_PRINT("Keeping preference on " 1744 "module parameter ieee80211_regdom: %c%c\n", 1745 ieee80211_regdom[0], 1746 ieee80211_regdom[1]); 1747 alpha2[0] = ieee80211_regdom[0]; 1748 alpha2[1] = ieee80211_regdom[1]; 1749 } 1750 } else { 1751 REG_DBG_PRINT("Restoring regulatory settings " 1752 "while preserving user preference for: %c%c\n", 1753 user_alpha2[0], 1754 user_alpha2[1]); 1755 alpha2[0] = user_alpha2[0]; 1756 alpha2[1] = user_alpha2[1]; 1757 } 1758 } else if (!is_world_regdom(ieee80211_regdom)) { 1759 REG_DBG_PRINT("Keeping preference on " 1760 "module parameter ieee80211_regdom: %c%c\n", 1761 ieee80211_regdom[0], 1762 ieee80211_regdom[1]); 1763 alpha2[0] = ieee80211_regdom[0]; 1764 alpha2[1] = ieee80211_regdom[1]; 1765 } else 1766 REG_DBG_PRINT("Restoring regulatory settings\n"); 1767 } 1768 1769 /* 1770 * Restoring regulatory settings involves ingoring any 1771 * possibly stale country IE information and user regulatory 1772 * settings if so desired, this includes any beacon hints 1773 * learned as we could have traveled outside to another country 1774 * after disconnection. To restore regulatory settings we do 1775 * exactly what we did at bootup: 1776 * 1777 * - send a core regulatory hint 1778 * - send a user regulatory hint if applicable 1779 * 1780 * Device drivers that send a regulatory hint for a specific country 1781 * keep their own regulatory domain on wiphy->regd so that does does 1782 * not need to be remembered. 1783 */ 1784 static void restore_regulatory_settings(bool reset_user) 1785 { 1786 char alpha2[2]; 1787 struct reg_beacon *reg_beacon, *btmp; 1788 struct regulatory_request *reg_request, *tmp; 1789 LIST_HEAD(tmp_reg_req_list); 1790 1791 mutex_lock(&cfg80211_mutex); 1792 mutex_lock(®_mutex); 1793 1794 reset_regdomains(true); 1795 restore_alpha2(alpha2, reset_user); 1796 1797 /* 1798 * If there's any pending requests we simply 1799 * stash them to a temporary pending queue and 1800 * add then after we've restored regulatory 1801 * settings. 1802 */ 1803 spin_lock(®_requests_lock); 1804 if (!list_empty(®_requests_list)) { 1805 list_for_each_entry_safe(reg_request, tmp, 1806 ®_requests_list, list) { 1807 if (reg_request->initiator != 1808 NL80211_REGDOM_SET_BY_USER) 1809 continue; 1810 list_del(®_request->list); 1811 list_add_tail(®_request->list, &tmp_reg_req_list); 1812 } 1813 } 1814 spin_unlock(®_requests_lock); 1815 1816 /* Clear beacon hints */ 1817 spin_lock_bh(®_pending_beacons_lock); 1818 if (!list_empty(®_pending_beacons)) { 1819 list_for_each_entry_safe(reg_beacon, btmp, 1820 ®_pending_beacons, list) { 1821 list_del(®_beacon->list); 1822 kfree(reg_beacon); 1823 } 1824 } 1825 spin_unlock_bh(®_pending_beacons_lock); 1826 1827 if (!list_empty(®_beacon_list)) { 1828 list_for_each_entry_safe(reg_beacon, btmp, 1829 ®_beacon_list, list) { 1830 list_del(®_beacon->list); 1831 kfree(reg_beacon); 1832 } 1833 } 1834 1835 /* First restore to the basic regulatory settings */ 1836 cfg80211_regdomain = cfg80211_world_regdom; 1837 1838 mutex_unlock(®_mutex); 1839 mutex_unlock(&cfg80211_mutex); 1840 1841 regulatory_hint_core(cfg80211_regdomain->alpha2); 1842 1843 /* 1844 * This restores the ieee80211_regdom module parameter 1845 * preference or the last user requested regulatory 1846 * settings, user regulatory settings takes precedence. 1847 */ 1848 if (is_an_alpha2(alpha2)) 1849 regulatory_hint_user(user_alpha2); 1850 1851 if (list_empty(&tmp_reg_req_list)) 1852 return; 1853 1854 mutex_lock(&cfg80211_mutex); 1855 mutex_lock(®_mutex); 1856 1857 spin_lock(®_requests_lock); 1858 list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) { 1859 REG_DBG_PRINT("Adding request for country %c%c back " 1860 "into the queue\n", 1861 reg_request->alpha2[0], 1862 reg_request->alpha2[1]); 1863 list_del(®_request->list); 1864 list_add_tail(®_request->list, ®_requests_list); 1865 } 1866 spin_unlock(®_requests_lock); 1867 1868 mutex_unlock(®_mutex); 1869 mutex_unlock(&cfg80211_mutex); 1870 1871 REG_DBG_PRINT("Kicking the queue\n"); 1872 1873 schedule_work(®_work); 1874 } 1875 1876 void regulatory_hint_disconnect(void) 1877 { 1878 REG_DBG_PRINT("All devices are disconnected, going to " 1879 "restore regulatory settings\n"); 1880 restore_regulatory_settings(false); 1881 } 1882 1883 static bool freq_is_chan_12_13_14(u16 freq) 1884 { 1885 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) || 1886 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) || 1887 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ)) 1888 return true; 1889 return false; 1890 } 1891 1892 int regulatory_hint_found_beacon(struct wiphy *wiphy, 1893 struct ieee80211_channel *beacon_chan, 1894 gfp_t gfp) 1895 { 1896 struct reg_beacon *reg_beacon; 1897 1898 if (likely((beacon_chan->beacon_found || 1899 (beacon_chan->flags & IEEE80211_CHAN_RADAR) || 1900 (beacon_chan->band == IEEE80211_BAND_2GHZ && 1901 !freq_is_chan_12_13_14(beacon_chan->center_freq))))) 1902 return 0; 1903 1904 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); 1905 if (!reg_beacon) 1906 return -ENOMEM; 1907 1908 REG_DBG_PRINT("Found new beacon on " 1909 "frequency: %d MHz (Ch %d) on %s\n", 1910 beacon_chan->center_freq, 1911 ieee80211_frequency_to_channel(beacon_chan->center_freq), 1912 wiphy_name(wiphy)); 1913 1914 memcpy(®_beacon->chan, beacon_chan, 1915 sizeof(struct ieee80211_channel)); 1916 1917 1918 /* 1919 * Since we can be called from BH or and non-BH context 1920 * we must use spin_lock_bh() 1921 */ 1922 spin_lock_bh(®_pending_beacons_lock); 1923 list_add_tail(®_beacon->list, ®_pending_beacons); 1924 spin_unlock_bh(®_pending_beacons_lock); 1925 1926 schedule_work(®_work); 1927 1928 return 0; 1929 } 1930 1931 static void print_rd_rules(const struct ieee80211_regdomain *rd) 1932 { 1933 unsigned int i; 1934 const struct ieee80211_reg_rule *reg_rule = NULL; 1935 const struct ieee80211_freq_range *freq_range = NULL; 1936 const struct ieee80211_power_rule *power_rule = NULL; 1937 1938 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n"); 1939 1940 for (i = 0; i < rd->n_reg_rules; i++) { 1941 reg_rule = &rd->reg_rules[i]; 1942 freq_range = ®_rule->freq_range; 1943 power_rule = ®_rule->power_rule; 1944 1945 /* 1946 * There may not be documentation for max antenna gain 1947 * in certain regions 1948 */ 1949 if (power_rule->max_antenna_gain) 1950 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n", 1951 freq_range->start_freq_khz, 1952 freq_range->end_freq_khz, 1953 freq_range->max_bandwidth_khz, 1954 power_rule->max_antenna_gain, 1955 power_rule->max_eirp); 1956 else 1957 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n", 1958 freq_range->start_freq_khz, 1959 freq_range->end_freq_khz, 1960 freq_range->max_bandwidth_khz, 1961 power_rule->max_eirp); 1962 } 1963 } 1964 1965 static void print_regdomain(const struct ieee80211_regdomain *rd) 1966 { 1967 1968 if (is_intersected_alpha2(rd->alpha2)) { 1969 1970 if (last_request->initiator == 1971 NL80211_REGDOM_SET_BY_COUNTRY_IE) { 1972 struct cfg80211_registered_device *rdev; 1973 rdev = cfg80211_rdev_by_wiphy_idx( 1974 last_request->wiphy_idx); 1975 if (rdev) { 1976 pr_info("Current regulatory domain updated by AP to: %c%c\n", 1977 rdev->country_ie_alpha2[0], 1978 rdev->country_ie_alpha2[1]); 1979 } else 1980 pr_info("Current regulatory domain intersected:\n"); 1981 } else 1982 pr_info("Current regulatory domain intersected:\n"); 1983 } else if (is_world_regdom(rd->alpha2)) 1984 pr_info("World regulatory domain updated:\n"); 1985 else { 1986 if (is_unknown_alpha2(rd->alpha2)) 1987 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n"); 1988 else 1989 pr_info("Regulatory domain changed to country: %c%c\n", 1990 rd->alpha2[0], rd->alpha2[1]); 1991 } 1992 print_rd_rules(rd); 1993 } 1994 1995 static void print_regdomain_info(const struct ieee80211_regdomain *rd) 1996 { 1997 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]); 1998 print_rd_rules(rd); 1999 } 2000 2001 /* Takes ownership of rd only if it doesn't fail */ 2002 static int __set_regdom(const struct ieee80211_regdomain *rd) 2003 { 2004 const struct ieee80211_regdomain *intersected_rd = NULL; 2005 struct cfg80211_registered_device *rdev = NULL; 2006 struct wiphy *request_wiphy; 2007 /* Some basic sanity checks first */ 2008 2009 if (is_world_regdom(rd->alpha2)) { 2010 if (WARN_ON(!reg_is_valid_request(rd->alpha2))) 2011 return -EINVAL; 2012 update_world_regdomain(rd); 2013 return 0; 2014 } 2015 2016 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && 2017 !is_unknown_alpha2(rd->alpha2)) 2018 return -EINVAL; 2019 2020 if (!last_request) 2021 return -EINVAL; 2022 2023 /* 2024 * Lets only bother proceeding on the same alpha2 if the current 2025 * rd is non static (it means CRDA was present and was used last) 2026 * and the pending request came in from a country IE 2027 */ 2028 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { 2029 /* 2030 * If someone else asked us to change the rd lets only bother 2031 * checking if the alpha2 changes if CRDA was already called 2032 */ 2033 if (!regdom_changes(rd->alpha2)) 2034 return -EINVAL; 2035 } 2036 2037 /* 2038 * Now lets set the regulatory domain, update all driver channels 2039 * and finally inform them of what we have done, in case they want 2040 * to review or adjust their own settings based on their own 2041 * internal EEPROM data 2042 */ 2043 2044 if (WARN_ON(!reg_is_valid_request(rd->alpha2))) 2045 return -EINVAL; 2046 2047 if (!is_valid_rd(rd)) { 2048 pr_err("Invalid regulatory domain detected:\n"); 2049 print_regdomain_info(rd); 2050 return -EINVAL; 2051 } 2052 2053 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 2054 if (!request_wiphy && 2055 (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || 2056 last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) { 2057 schedule_delayed_work(®_timeout, 0); 2058 return -ENODEV; 2059 } 2060 2061 if (!last_request->intersect) { 2062 int r; 2063 2064 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { 2065 reset_regdomains(false); 2066 cfg80211_regdomain = rd; 2067 return 0; 2068 } 2069 2070 /* 2071 * For a driver hint, lets copy the regulatory domain the 2072 * driver wanted to the wiphy to deal with conflicts 2073 */ 2074 2075 /* 2076 * Userspace could have sent two replies with only 2077 * one kernel request. 2078 */ 2079 if (request_wiphy->regd) 2080 return -EALREADY; 2081 2082 r = reg_copy_regd(&request_wiphy->regd, rd); 2083 if (r) 2084 return r; 2085 2086 reset_regdomains(false); 2087 cfg80211_regdomain = rd; 2088 return 0; 2089 } 2090 2091 /* Intersection requires a bit more work */ 2092 2093 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { 2094 2095 intersected_rd = regdom_intersect(rd, cfg80211_regdomain); 2096 if (!intersected_rd) 2097 return -EINVAL; 2098 2099 /* 2100 * We can trash what CRDA provided now. 2101 * However if a driver requested this specific regulatory 2102 * domain we keep it for its private use 2103 */ 2104 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) 2105 request_wiphy->regd = rd; 2106 else 2107 kfree(rd); 2108 2109 rd = NULL; 2110 2111 reset_regdomains(false); 2112 cfg80211_regdomain = intersected_rd; 2113 2114 return 0; 2115 } 2116 2117 if (!intersected_rd) 2118 return -EINVAL; 2119 2120 rdev = wiphy_to_dev(request_wiphy); 2121 2122 rdev->country_ie_alpha2[0] = rd->alpha2[0]; 2123 rdev->country_ie_alpha2[1] = rd->alpha2[1]; 2124 rdev->env = last_request->country_ie_env; 2125 2126 BUG_ON(intersected_rd == rd); 2127 2128 kfree(rd); 2129 rd = NULL; 2130 2131 reset_regdomains(false); 2132 cfg80211_regdomain = intersected_rd; 2133 2134 return 0; 2135 } 2136 2137 2138 /* 2139 * Use this call to set the current regulatory domain. Conflicts with 2140 * multiple drivers can be ironed out later. Caller must've already 2141 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex 2142 */ 2143 int set_regdom(const struct ieee80211_regdomain *rd) 2144 { 2145 int r; 2146 2147 assert_cfg80211_lock(); 2148 2149 mutex_lock(®_mutex); 2150 2151 /* Note that this doesn't update the wiphys, this is done below */ 2152 r = __set_regdom(rd); 2153 if (r) { 2154 kfree(rd); 2155 mutex_unlock(®_mutex); 2156 return r; 2157 } 2158 2159 /* This would make this whole thing pointless */ 2160 if (!last_request->intersect) 2161 BUG_ON(rd != cfg80211_regdomain); 2162 2163 /* update all wiphys now with the new established regulatory domain */ 2164 update_all_wiphy_regulatory(last_request->initiator); 2165 2166 print_regdomain(cfg80211_regdomain); 2167 2168 nl80211_send_reg_change_event(last_request); 2169 2170 reg_set_request_processed(); 2171 2172 mutex_unlock(®_mutex); 2173 2174 return r; 2175 } 2176 2177 #ifdef CONFIG_HOTPLUG 2178 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) 2179 { 2180 if (last_request && !last_request->processed) { 2181 if (add_uevent_var(env, "COUNTRY=%c%c", 2182 last_request->alpha2[0], 2183 last_request->alpha2[1])) 2184 return -ENOMEM; 2185 } 2186 2187 return 0; 2188 } 2189 #else 2190 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) 2191 { 2192 return -ENODEV; 2193 } 2194 #endif /* CONFIG_HOTPLUG */ 2195 2196 /* Caller must hold cfg80211_mutex */ 2197 void reg_device_remove(struct wiphy *wiphy) 2198 { 2199 struct wiphy *request_wiphy = NULL; 2200 2201 assert_cfg80211_lock(); 2202 2203 mutex_lock(®_mutex); 2204 2205 kfree(wiphy->regd); 2206 2207 if (last_request) 2208 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 2209 2210 if (!request_wiphy || request_wiphy != wiphy) 2211 goto out; 2212 2213 last_request->wiphy_idx = WIPHY_IDX_STALE; 2214 last_request->country_ie_env = ENVIRON_ANY; 2215 out: 2216 mutex_unlock(®_mutex); 2217 } 2218 2219 static void reg_timeout_work(struct work_struct *work) 2220 { 2221 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, " 2222 "restoring regulatory settings\n"); 2223 restore_regulatory_settings(true); 2224 } 2225 2226 int __init regulatory_init(void) 2227 { 2228 int err = 0; 2229 2230 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); 2231 if (IS_ERR(reg_pdev)) 2232 return PTR_ERR(reg_pdev); 2233 2234 reg_pdev->dev.type = ®_device_type; 2235 2236 spin_lock_init(®_requests_lock); 2237 spin_lock_init(®_pending_beacons_lock); 2238 2239 cfg80211_regdomain = cfg80211_world_regdom; 2240 2241 user_alpha2[0] = '9'; 2242 user_alpha2[1] = '7'; 2243 2244 /* We always try to get an update for the static regdomain */ 2245 err = regulatory_hint_core(cfg80211_regdomain->alpha2); 2246 if (err) { 2247 if (err == -ENOMEM) 2248 return err; 2249 /* 2250 * N.B. kobject_uevent_env() can fail mainly for when we're out 2251 * memory which is handled and propagated appropriately above 2252 * but it can also fail during a netlink_broadcast() or during 2253 * early boot for call_usermodehelper(). For now treat these 2254 * errors as non-fatal. 2255 */ 2256 pr_err("kobject_uevent_env() was unable to call CRDA during init\n"); 2257 #ifdef CONFIG_CFG80211_REG_DEBUG 2258 /* We want to find out exactly why when debugging */ 2259 WARN_ON(err); 2260 #endif 2261 } 2262 2263 /* 2264 * Finally, if the user set the module parameter treat it 2265 * as a user hint. 2266 */ 2267 if (!is_world_regdom(ieee80211_regdom)) 2268 regulatory_hint_user(ieee80211_regdom); 2269 2270 return 0; 2271 } 2272 2273 void /* __init_or_exit */ regulatory_exit(void) 2274 { 2275 struct regulatory_request *reg_request, *tmp; 2276 struct reg_beacon *reg_beacon, *btmp; 2277 2278 cancel_work_sync(®_work); 2279 cancel_delayed_work_sync(®_timeout); 2280 2281 mutex_lock(&cfg80211_mutex); 2282 mutex_lock(®_mutex); 2283 2284 reset_regdomains(true); 2285 2286 dev_set_uevent_suppress(®_pdev->dev, true); 2287 2288 platform_device_unregister(reg_pdev); 2289 2290 spin_lock_bh(®_pending_beacons_lock); 2291 if (!list_empty(®_pending_beacons)) { 2292 list_for_each_entry_safe(reg_beacon, btmp, 2293 ®_pending_beacons, list) { 2294 list_del(®_beacon->list); 2295 kfree(reg_beacon); 2296 } 2297 } 2298 spin_unlock_bh(®_pending_beacons_lock); 2299 2300 if (!list_empty(®_beacon_list)) { 2301 list_for_each_entry_safe(reg_beacon, btmp, 2302 ®_beacon_list, list) { 2303 list_del(®_beacon->list); 2304 kfree(reg_beacon); 2305 } 2306 } 2307 2308 spin_lock(®_requests_lock); 2309 if (!list_empty(®_requests_list)) { 2310 list_for_each_entry_safe(reg_request, tmp, 2311 ®_requests_list, list) { 2312 list_del(®_request->list); 2313 kfree(reg_request); 2314 } 2315 } 2316 spin_unlock(®_requests_lock); 2317 2318 mutex_unlock(®_mutex); 2319 mutex_unlock(&cfg80211_mutex); 2320 } 2321