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