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