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/list.h> 37 #include <linux/random.h> 38 #include <linux/nl80211.h> 39 #include <linux/platform_device.h> 40 #include <net/cfg80211.h> 41 #include "core.h" 42 #include "reg.h" 43 #include "nl80211.h" 44 45 /* Receipt of information from last regulatory request */ 46 static struct regulatory_request *last_request; 47 48 /* To trigger userspace events */ 49 static struct platform_device *reg_pdev; 50 51 /* 52 * Central wireless core regulatory domains, we only need two, 53 * the current one and a world regulatory domain in case we have no 54 * information to give us an alpha2 55 */ 56 const struct ieee80211_regdomain *cfg80211_regdomain; 57 58 /* 59 * We use this as a place for the rd structure built from the 60 * last parsed country IE to rest until CRDA gets back to us with 61 * what it thinks should apply for the same country 62 */ 63 static const struct ieee80211_regdomain *country_ie_regdomain; 64 65 /* 66 * Protects static reg.c components: 67 * - cfg80211_world_regdom 68 * - cfg80211_regdom 69 * - country_ie_regdomain 70 * - last_request 71 */ 72 DEFINE_MUTEX(reg_mutex); 73 #define assert_reg_lock() WARN_ON(!mutex_is_locked(®_mutex)) 74 75 /* Used to queue up regulatory hints */ 76 static LIST_HEAD(reg_requests_list); 77 static spinlock_t reg_requests_lock; 78 79 /* Used to queue up beacon hints for review */ 80 static LIST_HEAD(reg_pending_beacons); 81 static spinlock_t reg_pending_beacons_lock; 82 83 /* Used to keep track of processed beacon hints */ 84 static LIST_HEAD(reg_beacon_list); 85 86 struct reg_beacon { 87 struct list_head list; 88 struct ieee80211_channel chan; 89 }; 90 91 /* We keep a static world regulatory domain in case of the absence of CRDA */ 92 static const struct ieee80211_regdomain world_regdom = { 93 .n_reg_rules = 5, 94 .alpha2 = "00", 95 .reg_rules = { 96 /* IEEE 802.11b/g, channels 1..11 */ 97 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), 98 /* IEEE 802.11b/g, channels 12..13. No HT40 99 * channel fits here. */ 100 REG_RULE(2467-10, 2472+10, 20, 6, 20, 101 NL80211_RRF_PASSIVE_SCAN | 102 NL80211_RRF_NO_IBSS), 103 /* IEEE 802.11 channel 14 - Only JP enables 104 * this and for 802.11b only */ 105 REG_RULE(2484-10, 2484+10, 20, 6, 20, 106 NL80211_RRF_PASSIVE_SCAN | 107 NL80211_RRF_NO_IBSS | 108 NL80211_RRF_NO_OFDM), 109 /* IEEE 802.11a, channel 36..48 */ 110 REG_RULE(5180-10, 5240+10, 40, 6, 20, 111 NL80211_RRF_PASSIVE_SCAN | 112 NL80211_RRF_NO_IBSS), 113 114 /* NB: 5260 MHz - 5700 MHz requies DFS */ 115 116 /* IEEE 802.11a, channel 149..165 */ 117 REG_RULE(5745-10, 5825+10, 40, 6, 20, 118 NL80211_RRF_PASSIVE_SCAN | 119 NL80211_RRF_NO_IBSS), 120 } 121 }; 122 123 static const struct ieee80211_regdomain *cfg80211_world_regdom = 124 &world_regdom; 125 126 static char *ieee80211_regdom = "00"; 127 128 module_param(ieee80211_regdom, charp, 0444); 129 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); 130 131 #ifdef CONFIG_WIRELESS_OLD_REGULATORY 132 /* 133 * We assume 40 MHz bandwidth for the old regulatory work. 134 * We make emphasis we are using the exact same frequencies 135 * as before 136 */ 137 138 static const struct ieee80211_regdomain us_regdom = { 139 .n_reg_rules = 6, 140 .alpha2 = "US", 141 .reg_rules = { 142 /* IEEE 802.11b/g, channels 1..11 */ 143 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), 144 /* IEEE 802.11a, channel 36 */ 145 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), 146 /* IEEE 802.11a, channel 40 */ 147 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), 148 /* IEEE 802.11a, channel 44 */ 149 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), 150 /* IEEE 802.11a, channels 48..64 */ 151 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), 152 /* IEEE 802.11a, channels 149..165, outdoor */ 153 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), 154 } 155 }; 156 157 static const struct ieee80211_regdomain jp_regdom = { 158 .n_reg_rules = 3, 159 .alpha2 = "JP", 160 .reg_rules = { 161 /* IEEE 802.11b/g, channels 1..14 */ 162 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), 163 /* IEEE 802.11a, channels 34..48 */ 164 REG_RULE(5170-10, 5240+10, 40, 6, 20, 165 NL80211_RRF_PASSIVE_SCAN), 166 /* IEEE 802.11a, channels 52..64 */ 167 REG_RULE(5260-10, 5320+10, 40, 6, 20, 168 NL80211_RRF_NO_IBSS | 169 NL80211_RRF_DFS), 170 } 171 }; 172 173 static const struct ieee80211_regdomain eu_regdom = { 174 .n_reg_rules = 6, 175 /* 176 * This alpha2 is bogus, we leave it here just for stupid 177 * backward compatibility 178 */ 179 .alpha2 = "EU", 180 .reg_rules = { 181 /* IEEE 802.11b/g, channels 1..13 */ 182 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), 183 /* IEEE 802.11a, channel 36 */ 184 REG_RULE(5180-10, 5180+10, 40, 6, 23, 185 NL80211_RRF_PASSIVE_SCAN), 186 /* IEEE 802.11a, channel 40 */ 187 REG_RULE(5200-10, 5200+10, 40, 6, 23, 188 NL80211_RRF_PASSIVE_SCAN), 189 /* IEEE 802.11a, channel 44 */ 190 REG_RULE(5220-10, 5220+10, 40, 6, 23, 191 NL80211_RRF_PASSIVE_SCAN), 192 /* IEEE 802.11a, channels 48..64 */ 193 REG_RULE(5240-10, 5320+10, 40, 6, 20, 194 NL80211_RRF_NO_IBSS | 195 NL80211_RRF_DFS), 196 /* IEEE 802.11a, channels 100..140 */ 197 REG_RULE(5500-10, 5700+10, 40, 6, 30, 198 NL80211_RRF_NO_IBSS | 199 NL80211_RRF_DFS), 200 } 201 }; 202 203 static const struct ieee80211_regdomain *static_regdom(char *alpha2) 204 { 205 if (alpha2[0] == 'U' && alpha2[1] == 'S') 206 return &us_regdom; 207 if (alpha2[0] == 'J' && alpha2[1] == 'P') 208 return &jp_regdom; 209 if (alpha2[0] == 'E' && alpha2[1] == 'U') 210 return &eu_regdom; 211 /* Default, as per the old rules */ 212 return &us_regdom; 213 } 214 215 static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) 216 { 217 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) 218 return true; 219 return false; 220 } 221 #else 222 static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) 223 { 224 return false; 225 } 226 #endif 227 228 static void reset_regdomains(void) 229 { 230 /* avoid freeing static information or freeing something twice */ 231 if (cfg80211_regdomain == cfg80211_world_regdom) 232 cfg80211_regdomain = NULL; 233 if (cfg80211_world_regdom == &world_regdom) 234 cfg80211_world_regdom = NULL; 235 if (cfg80211_regdomain == &world_regdom) 236 cfg80211_regdomain = NULL; 237 if (is_old_static_regdom(cfg80211_regdomain)) 238 cfg80211_regdomain = NULL; 239 240 kfree(cfg80211_regdomain); 241 kfree(cfg80211_world_regdom); 242 243 cfg80211_world_regdom = &world_regdom; 244 cfg80211_regdomain = NULL; 245 } 246 247 /* 248 * Dynamic world regulatory domain requested by the wireless 249 * core upon initialization 250 */ 251 static void update_world_regdomain(const struct ieee80211_regdomain *rd) 252 { 253 BUG_ON(!last_request); 254 255 reset_regdomains(); 256 257 cfg80211_world_regdom = rd; 258 cfg80211_regdomain = rd; 259 } 260 261 bool is_world_regdom(const char *alpha2) 262 { 263 if (!alpha2) 264 return false; 265 if (alpha2[0] == '0' && alpha2[1] == '0') 266 return true; 267 return false; 268 } 269 270 static bool is_alpha2_set(const char *alpha2) 271 { 272 if (!alpha2) 273 return false; 274 if (alpha2[0] != 0 && alpha2[1] != 0) 275 return true; 276 return false; 277 } 278 279 static bool is_alpha_upper(char letter) 280 { 281 /* ASCII A - Z */ 282 if (letter >= 65 && letter <= 90) 283 return true; 284 return false; 285 } 286 287 static bool is_unknown_alpha2(const char *alpha2) 288 { 289 if (!alpha2) 290 return false; 291 /* 292 * Special case where regulatory domain was built by driver 293 * but a specific alpha2 cannot be determined 294 */ 295 if (alpha2[0] == '9' && alpha2[1] == '9') 296 return true; 297 return false; 298 } 299 300 static bool is_intersected_alpha2(const char *alpha2) 301 { 302 if (!alpha2) 303 return false; 304 /* 305 * Special case where regulatory domain is the 306 * result of an intersection between two regulatory domain 307 * structures 308 */ 309 if (alpha2[0] == '9' && alpha2[1] == '8') 310 return true; 311 return false; 312 } 313 314 static bool is_an_alpha2(const char *alpha2) 315 { 316 if (!alpha2) 317 return false; 318 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) 319 return true; 320 return false; 321 } 322 323 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) 324 { 325 if (!alpha2_x || !alpha2_y) 326 return false; 327 if (alpha2_x[0] == alpha2_y[0] && 328 alpha2_x[1] == alpha2_y[1]) 329 return true; 330 return false; 331 } 332 333 static bool regdom_changes(const char *alpha2) 334 { 335 assert_cfg80211_lock(); 336 337 if (!cfg80211_regdomain) 338 return true; 339 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) 340 return false; 341 return true; 342 } 343 344 /** 345 * country_ie_integrity_changes - tells us if the country IE has changed 346 * @checksum: checksum of country IE of fields we are interested in 347 * 348 * If the country IE has not changed you can ignore it safely. This is 349 * useful to determine if two devices are seeing two different country IEs 350 * even on the same alpha2. Note that this will return false if no IE has 351 * been set on the wireless core yet. 352 */ 353 static bool country_ie_integrity_changes(u32 checksum) 354 { 355 /* If no IE has been set then the checksum doesn't change */ 356 if (unlikely(!last_request->country_ie_checksum)) 357 return false; 358 if (unlikely(last_request->country_ie_checksum != checksum)) 359 return true; 360 return false; 361 } 362 363 /* 364 * This lets us keep regulatory code which is updated on a regulatory 365 * basis in userspace. 366 */ 367 static int call_crda(const char *alpha2) 368 { 369 char country_env[9 + 2] = "COUNTRY="; 370 char *envp[] = { 371 country_env, 372 NULL 373 }; 374 375 if (!is_world_regdom((char *) alpha2)) 376 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", 377 alpha2[0], alpha2[1]); 378 else 379 printk(KERN_INFO "cfg80211: Calling CRDA to update world " 380 "regulatory domain\n"); 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 */ 389 bool 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 */ 400 static 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 } 419 420 static 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 } 439 440 static 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 **/ 469 static 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 * Converts a country IE to a regulatory domain. A regulatory domain 483 * structure has a lot of information which the IE doesn't yet have, 484 * so for the other values we use upper max values as we will intersect 485 * with our userspace regulatory agent to get lower bounds. 486 */ 487 static struct ieee80211_regdomain *country_ie_2_rd( 488 u8 *country_ie, 489 u8 country_ie_len, 490 u32 *checksum) 491 { 492 struct ieee80211_regdomain *rd = NULL; 493 unsigned int i = 0; 494 char alpha2[2]; 495 u32 flags = 0; 496 u32 num_rules = 0, size_of_regd = 0; 497 u8 *triplets_start = NULL; 498 u8 len_at_triplet = 0; 499 /* the last channel we have registered in a subband (triplet) */ 500 int last_sub_max_channel = 0; 501 502 *checksum = 0xDEADBEEF; 503 504 /* Country IE requirements */ 505 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || 506 country_ie_len & 0x01); 507 508 alpha2[0] = country_ie[0]; 509 alpha2[1] = country_ie[1]; 510 511 /* 512 * Third octet can be: 513 * 'I' - Indoor 514 * 'O' - Outdoor 515 * 516 * anything else we assume is no restrictions 517 */ 518 if (country_ie[2] == 'I') 519 flags = NL80211_RRF_NO_OUTDOOR; 520 else if (country_ie[2] == 'O') 521 flags = NL80211_RRF_NO_INDOOR; 522 523 country_ie += 3; 524 country_ie_len -= 3; 525 526 triplets_start = country_ie; 527 len_at_triplet = country_ie_len; 528 529 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); 530 531 /* 532 * We need to build a reg rule for each triplet, but first we must 533 * calculate the number of reg rules we will need. We will need one 534 * for each channel subband 535 */ 536 while (country_ie_len >= 3) { 537 int end_channel = 0; 538 struct ieee80211_country_ie_triplet *triplet = 539 (struct ieee80211_country_ie_triplet *) country_ie; 540 int cur_sub_max_channel = 0, cur_channel = 0; 541 542 if (triplet->ext.reg_extension_id >= 543 IEEE80211_COUNTRY_EXTENSION_ID) { 544 country_ie += 3; 545 country_ie_len -= 3; 546 continue; 547 } 548 549 /* 2 GHz */ 550 if (triplet->chans.first_channel <= 14) 551 end_channel = triplet->chans.first_channel + 552 triplet->chans.num_channels; 553 else 554 /* 555 * 5 GHz -- For example in country IEs if the first 556 * channel given is 36 and the number of channels is 4 557 * then the individual channel numbers defined for the 558 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 559 * and not 36, 37, 38, 39. 560 * 561 * See: http://tinyurl.com/11d-clarification 562 */ 563 end_channel = triplet->chans.first_channel + 564 (4 * (triplet->chans.num_channels - 1)); 565 566 cur_channel = triplet->chans.first_channel; 567 cur_sub_max_channel = end_channel; 568 569 /* Basic sanity check */ 570 if (cur_sub_max_channel < cur_channel) 571 return NULL; 572 573 /* 574 * Do not allow overlapping channels. Also channels 575 * passed in each subband must be monotonically 576 * increasing 577 */ 578 if (last_sub_max_channel) { 579 if (cur_channel <= last_sub_max_channel) 580 return NULL; 581 if (cur_sub_max_channel <= last_sub_max_channel) 582 return NULL; 583 } 584 585 /* 586 * When dot11RegulatoryClassesRequired is supported 587 * we can throw ext triplets as part of this soup, 588 * for now we don't care when those change as we 589 * don't support them 590 */ 591 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | 592 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | 593 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); 594 595 last_sub_max_channel = cur_sub_max_channel; 596 597 country_ie += 3; 598 country_ie_len -= 3; 599 num_rules++; 600 601 /* 602 * Note: this is not a IEEE requirement but 603 * simply a memory requirement 604 */ 605 if (num_rules > NL80211_MAX_SUPP_REG_RULES) 606 return NULL; 607 } 608 609 country_ie = triplets_start; 610 country_ie_len = len_at_triplet; 611 612 size_of_regd = sizeof(struct ieee80211_regdomain) + 613 (num_rules * sizeof(struct ieee80211_reg_rule)); 614 615 rd = kzalloc(size_of_regd, GFP_KERNEL); 616 if (!rd) 617 return NULL; 618 619 rd->n_reg_rules = num_rules; 620 rd->alpha2[0] = alpha2[0]; 621 rd->alpha2[1] = alpha2[1]; 622 623 /* This time around we fill in the rd */ 624 while (country_ie_len >= 3) { 625 int end_channel = 0; 626 struct ieee80211_country_ie_triplet *triplet = 627 (struct ieee80211_country_ie_triplet *) country_ie; 628 struct ieee80211_reg_rule *reg_rule = NULL; 629 struct ieee80211_freq_range *freq_range = NULL; 630 struct ieee80211_power_rule *power_rule = NULL; 631 632 /* 633 * Must parse if dot11RegulatoryClassesRequired is true, 634 * we don't support this yet 635 */ 636 if (triplet->ext.reg_extension_id >= 637 IEEE80211_COUNTRY_EXTENSION_ID) { 638 country_ie += 3; 639 country_ie_len -= 3; 640 continue; 641 } 642 643 reg_rule = &rd->reg_rules[i]; 644 freq_range = ®_rule->freq_range; 645 power_rule = ®_rule->power_rule; 646 647 reg_rule->flags = flags; 648 649 /* 2 GHz */ 650 if (triplet->chans.first_channel <= 14) 651 end_channel = triplet->chans.first_channel + 652 triplet->chans.num_channels; 653 else 654 end_channel = triplet->chans.first_channel + 655 (4 * (triplet->chans.num_channels - 1)); 656 657 /* 658 * The +10 is since the regulatory domain expects 659 * the actual band edge, not the center of freq for 660 * its start and end freqs, assuming 20 MHz bandwidth on 661 * the channels passed 662 */ 663 freq_range->start_freq_khz = 664 MHZ_TO_KHZ(ieee80211_channel_to_frequency( 665 triplet->chans.first_channel) - 10); 666 freq_range->end_freq_khz = 667 MHZ_TO_KHZ(ieee80211_channel_to_frequency( 668 end_channel) + 10); 669 670 /* 671 * These are large arbitrary values we use to intersect later. 672 * Increment this if we ever support >= 40 MHz channels 673 * in IEEE 802.11 674 */ 675 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); 676 power_rule->max_antenna_gain = DBI_TO_MBI(100); 677 power_rule->max_eirp = DBM_TO_MBM(100); 678 679 country_ie += 3; 680 country_ie_len -= 3; 681 i++; 682 683 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); 684 } 685 686 return rd; 687 } 688 689 690 /* 691 * Helper for regdom_intersect(), this does the real 692 * mathematical intersection fun 693 */ 694 static int reg_rules_intersect( 695 const struct ieee80211_reg_rule *rule1, 696 const struct ieee80211_reg_rule *rule2, 697 struct ieee80211_reg_rule *intersected_rule) 698 { 699 const struct ieee80211_freq_range *freq_range1, *freq_range2; 700 struct ieee80211_freq_range *freq_range; 701 const struct ieee80211_power_rule *power_rule1, *power_rule2; 702 struct ieee80211_power_rule *power_rule; 703 u32 freq_diff; 704 705 freq_range1 = &rule1->freq_range; 706 freq_range2 = &rule2->freq_range; 707 freq_range = &intersected_rule->freq_range; 708 709 power_rule1 = &rule1->power_rule; 710 power_rule2 = &rule2->power_rule; 711 power_rule = &intersected_rule->power_rule; 712 713 freq_range->start_freq_khz = max(freq_range1->start_freq_khz, 714 freq_range2->start_freq_khz); 715 freq_range->end_freq_khz = min(freq_range1->end_freq_khz, 716 freq_range2->end_freq_khz); 717 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, 718 freq_range2->max_bandwidth_khz); 719 720 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; 721 if (freq_range->max_bandwidth_khz > freq_diff) 722 freq_range->max_bandwidth_khz = freq_diff; 723 724 power_rule->max_eirp = min(power_rule1->max_eirp, 725 power_rule2->max_eirp); 726 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, 727 power_rule2->max_antenna_gain); 728 729 intersected_rule->flags = (rule1->flags | rule2->flags); 730 731 if (!is_valid_reg_rule(intersected_rule)) 732 return -EINVAL; 733 734 return 0; 735 } 736 737 /** 738 * regdom_intersect - do the intersection between two regulatory domains 739 * @rd1: first regulatory domain 740 * @rd2: second regulatory domain 741 * 742 * Use this function to get the intersection between two regulatory domains. 743 * Once completed we will mark the alpha2 for the rd as intersected, "98", 744 * as no one single alpha2 can represent this regulatory domain. 745 * 746 * Returns a pointer to the regulatory domain structure which will hold the 747 * resulting intersection of rules between rd1 and rd2. We will 748 * kzalloc() this structure for you. 749 */ 750 static struct ieee80211_regdomain *regdom_intersect( 751 const struct ieee80211_regdomain *rd1, 752 const struct ieee80211_regdomain *rd2) 753 { 754 int r, size_of_regd; 755 unsigned int x, y; 756 unsigned int num_rules = 0, rule_idx = 0; 757 const struct ieee80211_reg_rule *rule1, *rule2; 758 struct ieee80211_reg_rule *intersected_rule; 759 struct ieee80211_regdomain *rd; 760 /* This is just a dummy holder to help us count */ 761 struct ieee80211_reg_rule irule; 762 763 /* Uses the stack temporarily for counter arithmetic */ 764 intersected_rule = &irule; 765 766 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); 767 768 if (!rd1 || !rd2) 769 return NULL; 770 771 /* 772 * First we get a count of the rules we'll need, then we actually 773 * build them. This is to so we can malloc() and free() a 774 * regdomain once. The reason we use reg_rules_intersect() here 775 * is it will return -EINVAL if the rule computed makes no sense. 776 * All rules that do check out OK are valid. 777 */ 778 779 for (x = 0; x < rd1->n_reg_rules; x++) { 780 rule1 = &rd1->reg_rules[x]; 781 for (y = 0; y < rd2->n_reg_rules; y++) { 782 rule2 = &rd2->reg_rules[y]; 783 if (!reg_rules_intersect(rule1, rule2, 784 intersected_rule)) 785 num_rules++; 786 memset(intersected_rule, 0, 787 sizeof(struct ieee80211_reg_rule)); 788 } 789 } 790 791 if (!num_rules) 792 return NULL; 793 794 size_of_regd = sizeof(struct ieee80211_regdomain) + 795 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); 796 797 rd = kzalloc(size_of_regd, GFP_KERNEL); 798 if (!rd) 799 return NULL; 800 801 for (x = 0; x < rd1->n_reg_rules; x++) { 802 rule1 = &rd1->reg_rules[x]; 803 for (y = 0; y < rd2->n_reg_rules; y++) { 804 rule2 = &rd2->reg_rules[y]; 805 /* 806 * This time around instead of using the stack lets 807 * write to the target rule directly saving ourselves 808 * a memcpy() 809 */ 810 intersected_rule = &rd->reg_rules[rule_idx]; 811 r = reg_rules_intersect(rule1, rule2, 812 intersected_rule); 813 /* 814 * No need to memset here the intersected rule here as 815 * we're not using the stack anymore 816 */ 817 if (r) 818 continue; 819 rule_idx++; 820 } 821 } 822 823 if (rule_idx != num_rules) { 824 kfree(rd); 825 return NULL; 826 } 827 828 rd->n_reg_rules = num_rules; 829 rd->alpha2[0] = '9'; 830 rd->alpha2[1] = '8'; 831 832 return rd; 833 } 834 835 /* 836 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may 837 * want to just have the channel structure use these 838 */ 839 static u32 map_regdom_flags(u32 rd_flags) 840 { 841 u32 channel_flags = 0; 842 if (rd_flags & NL80211_RRF_PASSIVE_SCAN) 843 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; 844 if (rd_flags & NL80211_RRF_NO_IBSS) 845 channel_flags |= IEEE80211_CHAN_NO_IBSS; 846 if (rd_flags & NL80211_RRF_DFS) 847 channel_flags |= IEEE80211_CHAN_RADAR; 848 return channel_flags; 849 } 850 851 static int freq_reg_info_regd(struct wiphy *wiphy, 852 u32 center_freq, 853 u32 desired_bw_khz, 854 const struct ieee80211_reg_rule **reg_rule, 855 const struct ieee80211_regdomain *custom_regd) 856 { 857 int i; 858 bool band_rule_found = false; 859 const struct ieee80211_regdomain *regd; 860 bool bw_fits = false; 861 862 if (!desired_bw_khz) 863 desired_bw_khz = MHZ_TO_KHZ(20); 864 865 regd = custom_regd ? custom_regd : cfg80211_regdomain; 866 867 /* 868 * Follow the driver's regulatory domain, if present, unless a country 869 * IE has been processed or a user wants to help complaince further 870 */ 871 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && 872 last_request->initiator != NL80211_REGDOM_SET_BY_USER && 873 wiphy->regd) 874 regd = wiphy->regd; 875 876 if (!regd) 877 return -EINVAL; 878 879 for (i = 0; i < regd->n_reg_rules; i++) { 880 const struct ieee80211_reg_rule *rr; 881 const struct ieee80211_freq_range *fr = NULL; 882 const struct ieee80211_power_rule *pr = NULL; 883 884 rr = ®d->reg_rules[i]; 885 fr = &rr->freq_range; 886 pr = &rr->power_rule; 887 888 /* 889 * We only need to know if one frequency rule was 890 * was in center_freq's band, that's enough, so lets 891 * not overwrite it once found 892 */ 893 if (!band_rule_found) 894 band_rule_found = freq_in_rule_band(fr, center_freq); 895 896 bw_fits = reg_does_bw_fit(fr, 897 center_freq, 898 desired_bw_khz); 899 900 if (band_rule_found && bw_fits) { 901 *reg_rule = rr; 902 return 0; 903 } 904 } 905 906 if (!band_rule_found) 907 return -ERANGE; 908 909 return -EINVAL; 910 } 911 EXPORT_SYMBOL(freq_reg_info); 912 913 int freq_reg_info(struct wiphy *wiphy, 914 u32 center_freq, 915 u32 desired_bw_khz, 916 const struct ieee80211_reg_rule **reg_rule) 917 { 918 assert_cfg80211_lock(); 919 return freq_reg_info_regd(wiphy, 920 center_freq, 921 desired_bw_khz, 922 reg_rule, 923 NULL); 924 } 925 926 /* 927 * Note that right now we assume the desired channel bandwidth 928 * is always 20 MHz for each individual channel (HT40 uses 20 MHz 929 * per channel, the primary and the extension channel). To support 930 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a 931 * new ieee80211_channel.target_bw and re run the regulatory check 932 * on the wiphy with the target_bw specified. Then we can simply use 933 * that below for the desired_bw_khz below. 934 */ 935 static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, 936 unsigned int chan_idx) 937 { 938 int r; 939 u32 flags, bw_flags = 0; 940 u32 desired_bw_khz = MHZ_TO_KHZ(20); 941 const struct ieee80211_reg_rule *reg_rule = NULL; 942 const struct ieee80211_power_rule *power_rule = NULL; 943 const struct ieee80211_freq_range *freq_range = NULL; 944 struct ieee80211_supported_band *sband; 945 struct ieee80211_channel *chan; 946 struct wiphy *request_wiphy = NULL; 947 948 assert_cfg80211_lock(); 949 950 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 951 952 sband = wiphy->bands[band]; 953 BUG_ON(chan_idx >= sband->n_channels); 954 chan = &sband->channels[chan_idx]; 955 956 flags = chan->orig_flags; 957 958 r = freq_reg_info(wiphy, 959 MHZ_TO_KHZ(chan->center_freq), 960 desired_bw_khz, 961 ®_rule); 962 963 if (r) { 964 /* 965 * This means no regulatory rule was found in the country IE 966 * with a frequency range on the center_freq's band, since 967 * IEEE-802.11 allows for a country IE to have a subset of the 968 * regulatory information provided in a country we ignore 969 * disabling the channel unless at least one reg rule was 970 * found on the center_freq's band. For details see this 971 * clarification: 972 * 973 * http://tinyurl.com/11d-clarification 974 */ 975 if (r == -ERANGE && 976 last_request->initiator == 977 NL80211_REGDOM_SET_BY_COUNTRY_IE) { 978 #ifdef CONFIG_CFG80211_REG_DEBUG 979 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " 980 "intact on %s - no rule found in band on " 981 "Country IE\n", 982 chan->center_freq, wiphy_name(wiphy)); 983 #endif 984 } else { 985 /* 986 * In this case we know the country IE has at least one reg rule 987 * for the band so we respect its band definitions 988 */ 989 #ifdef CONFIG_CFG80211_REG_DEBUG 990 if (last_request->initiator == 991 NL80211_REGDOM_SET_BY_COUNTRY_IE) 992 printk(KERN_DEBUG "cfg80211: Disabling " 993 "channel %d MHz on %s due to " 994 "Country IE\n", 995 chan->center_freq, wiphy_name(wiphy)); 996 #endif 997 flags |= IEEE80211_CHAN_DISABLED; 998 chan->flags = flags; 999 } 1000 return; 1001 } 1002 1003 power_rule = ®_rule->power_rule; 1004 freq_range = ®_rule->freq_range; 1005 1006 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) 1007 bw_flags = IEEE80211_CHAN_NO_HT40; 1008 1009 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && 1010 request_wiphy && request_wiphy == wiphy && 1011 request_wiphy->strict_regulatory) { 1012 /* 1013 * This gaurantees the driver's requested regulatory domain 1014 * will always be used as a base for further regulatory 1015 * settings 1016 */ 1017 chan->flags = chan->orig_flags = 1018 map_regdom_flags(reg_rule->flags) | bw_flags; 1019 chan->max_antenna_gain = chan->orig_mag = 1020 (int) MBI_TO_DBI(power_rule->max_antenna_gain); 1021 chan->max_power = chan->orig_mpwr = 1022 (int) MBM_TO_DBM(power_rule->max_eirp); 1023 return; 1024 } 1025 1026 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); 1027 chan->max_antenna_gain = min(chan->orig_mag, 1028 (int) MBI_TO_DBI(power_rule->max_antenna_gain)); 1029 if (chan->orig_mpwr) 1030 chan->max_power = min(chan->orig_mpwr, 1031 (int) MBM_TO_DBM(power_rule->max_eirp)); 1032 else 1033 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); 1034 } 1035 1036 static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) 1037 { 1038 unsigned int i; 1039 struct ieee80211_supported_band *sband; 1040 1041 BUG_ON(!wiphy->bands[band]); 1042 sband = wiphy->bands[band]; 1043 1044 for (i = 0; i < sband->n_channels; i++) 1045 handle_channel(wiphy, band, i); 1046 } 1047 1048 static bool ignore_reg_update(struct wiphy *wiphy, 1049 enum nl80211_reg_initiator initiator) 1050 { 1051 if (!last_request) 1052 return true; 1053 if (initiator == NL80211_REGDOM_SET_BY_CORE && 1054 wiphy->custom_regulatory) 1055 return true; 1056 /* 1057 * wiphy->regd will be set once the device has its own 1058 * desired regulatory domain set 1059 */ 1060 if (wiphy->strict_regulatory && !wiphy->regd && 1061 !is_world_regdom(last_request->alpha2)) 1062 return true; 1063 return false; 1064 } 1065 1066 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) 1067 { 1068 struct cfg80211_registered_device *rdev; 1069 1070 list_for_each_entry(rdev, &cfg80211_rdev_list, list) 1071 wiphy_update_regulatory(&rdev->wiphy, initiator); 1072 } 1073 1074 static void handle_reg_beacon(struct wiphy *wiphy, 1075 unsigned int chan_idx, 1076 struct reg_beacon *reg_beacon) 1077 { 1078 struct ieee80211_supported_band *sband; 1079 struct ieee80211_channel *chan; 1080 bool channel_changed = false; 1081 struct ieee80211_channel chan_before; 1082 1083 assert_cfg80211_lock(); 1084 1085 sband = wiphy->bands[reg_beacon->chan.band]; 1086 chan = &sband->channels[chan_idx]; 1087 1088 if (likely(chan->center_freq != reg_beacon->chan.center_freq)) 1089 return; 1090 1091 if (chan->beacon_found) 1092 return; 1093 1094 chan->beacon_found = true; 1095 1096 if (wiphy->disable_beacon_hints) 1097 return; 1098 1099 chan_before.center_freq = chan->center_freq; 1100 chan_before.flags = chan->flags; 1101 1102 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { 1103 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; 1104 channel_changed = true; 1105 } 1106 1107 if (chan->flags & IEEE80211_CHAN_NO_IBSS) { 1108 chan->flags &= ~IEEE80211_CHAN_NO_IBSS; 1109 channel_changed = true; 1110 } 1111 1112 if (channel_changed) 1113 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); 1114 } 1115 1116 /* 1117 * Called when a scan on a wiphy finds a beacon on 1118 * new channel 1119 */ 1120 static void wiphy_update_new_beacon(struct wiphy *wiphy, 1121 struct reg_beacon *reg_beacon) 1122 { 1123 unsigned int i; 1124 struct ieee80211_supported_band *sband; 1125 1126 assert_cfg80211_lock(); 1127 1128 if (!wiphy->bands[reg_beacon->chan.band]) 1129 return; 1130 1131 sband = wiphy->bands[reg_beacon->chan.band]; 1132 1133 for (i = 0; i < sband->n_channels; i++) 1134 handle_reg_beacon(wiphy, i, reg_beacon); 1135 } 1136 1137 /* 1138 * Called upon reg changes or a new wiphy is added 1139 */ 1140 static void wiphy_update_beacon_reg(struct wiphy *wiphy) 1141 { 1142 unsigned int i; 1143 struct ieee80211_supported_band *sband; 1144 struct reg_beacon *reg_beacon; 1145 1146 assert_cfg80211_lock(); 1147 1148 if (list_empty(®_beacon_list)) 1149 return; 1150 1151 list_for_each_entry(reg_beacon, ®_beacon_list, list) { 1152 if (!wiphy->bands[reg_beacon->chan.band]) 1153 continue; 1154 sband = wiphy->bands[reg_beacon->chan.band]; 1155 for (i = 0; i < sband->n_channels; i++) 1156 handle_reg_beacon(wiphy, i, reg_beacon); 1157 } 1158 } 1159 1160 static bool reg_is_world_roaming(struct wiphy *wiphy) 1161 { 1162 if (is_world_regdom(cfg80211_regdomain->alpha2) || 1163 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) 1164 return true; 1165 if (last_request && 1166 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && 1167 wiphy->custom_regulatory) 1168 return true; 1169 return false; 1170 } 1171 1172 /* Reap the advantages of previously found beacons */ 1173 static void reg_process_beacons(struct wiphy *wiphy) 1174 { 1175 /* 1176 * Means we are just firing up cfg80211, so no beacons would 1177 * have been processed yet. 1178 */ 1179 if (!last_request) 1180 return; 1181 if (!reg_is_world_roaming(wiphy)) 1182 return; 1183 wiphy_update_beacon_reg(wiphy); 1184 } 1185 1186 static bool is_ht40_not_allowed(struct ieee80211_channel *chan) 1187 { 1188 if (!chan) 1189 return true; 1190 if (chan->flags & IEEE80211_CHAN_DISABLED) 1191 return true; 1192 /* This would happen when regulatory rules disallow HT40 completely */ 1193 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) 1194 return true; 1195 return false; 1196 } 1197 1198 static void reg_process_ht_flags_channel(struct wiphy *wiphy, 1199 enum ieee80211_band band, 1200 unsigned int chan_idx) 1201 { 1202 struct ieee80211_supported_band *sband; 1203 struct ieee80211_channel *channel; 1204 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; 1205 unsigned int i; 1206 1207 assert_cfg80211_lock(); 1208 1209 sband = wiphy->bands[band]; 1210 BUG_ON(chan_idx >= sband->n_channels); 1211 channel = &sband->channels[chan_idx]; 1212 1213 if (is_ht40_not_allowed(channel)) { 1214 channel->flags |= IEEE80211_CHAN_NO_HT40; 1215 return; 1216 } 1217 1218 /* 1219 * We need to ensure the extension channels exist to 1220 * be able to use HT40- or HT40+, this finds them (or not) 1221 */ 1222 for (i = 0; i < sband->n_channels; i++) { 1223 struct ieee80211_channel *c = &sband->channels[i]; 1224 if (c->center_freq == (channel->center_freq - 20)) 1225 channel_before = c; 1226 if (c->center_freq == (channel->center_freq + 20)) 1227 channel_after = c; 1228 } 1229 1230 /* 1231 * Please note that this assumes target bandwidth is 20 MHz, 1232 * if that ever changes we also need to change the below logic 1233 * to include that as well. 1234 */ 1235 if (is_ht40_not_allowed(channel_before)) 1236 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; 1237 else 1238 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; 1239 1240 if (is_ht40_not_allowed(channel_after)) 1241 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; 1242 else 1243 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; 1244 } 1245 1246 static void reg_process_ht_flags_band(struct wiphy *wiphy, 1247 enum ieee80211_band band) 1248 { 1249 unsigned int i; 1250 struct ieee80211_supported_band *sband; 1251 1252 BUG_ON(!wiphy->bands[band]); 1253 sband = wiphy->bands[band]; 1254 1255 for (i = 0; i < sband->n_channels; i++) 1256 reg_process_ht_flags_channel(wiphy, band, i); 1257 } 1258 1259 static void reg_process_ht_flags(struct wiphy *wiphy) 1260 { 1261 enum ieee80211_band band; 1262 1263 if (!wiphy) 1264 return; 1265 1266 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1267 if (wiphy->bands[band]) 1268 reg_process_ht_flags_band(wiphy, band); 1269 } 1270 1271 } 1272 1273 void wiphy_update_regulatory(struct wiphy *wiphy, 1274 enum nl80211_reg_initiator initiator) 1275 { 1276 enum ieee80211_band band; 1277 1278 if (ignore_reg_update(wiphy, initiator)) 1279 goto out; 1280 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1281 if (wiphy->bands[band]) 1282 handle_band(wiphy, band); 1283 } 1284 out: 1285 reg_process_beacons(wiphy); 1286 reg_process_ht_flags(wiphy); 1287 if (wiphy->reg_notifier) 1288 wiphy->reg_notifier(wiphy, last_request); 1289 } 1290 1291 static void handle_channel_custom(struct wiphy *wiphy, 1292 enum ieee80211_band band, 1293 unsigned int chan_idx, 1294 const struct ieee80211_regdomain *regd) 1295 { 1296 int r; 1297 u32 desired_bw_khz = MHZ_TO_KHZ(20); 1298 u32 bw_flags = 0; 1299 const struct ieee80211_reg_rule *reg_rule = NULL; 1300 const struct ieee80211_power_rule *power_rule = NULL; 1301 const struct ieee80211_freq_range *freq_range = NULL; 1302 struct ieee80211_supported_band *sband; 1303 struct ieee80211_channel *chan; 1304 1305 assert_reg_lock(); 1306 1307 sband = wiphy->bands[band]; 1308 BUG_ON(chan_idx >= sband->n_channels); 1309 chan = &sband->channels[chan_idx]; 1310 1311 r = freq_reg_info_regd(wiphy, 1312 MHZ_TO_KHZ(chan->center_freq), 1313 desired_bw_khz, 1314 ®_rule, 1315 regd); 1316 1317 if (r) { 1318 chan->flags = IEEE80211_CHAN_DISABLED; 1319 return; 1320 } 1321 1322 power_rule = ®_rule->power_rule; 1323 freq_range = ®_rule->freq_range; 1324 1325 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) 1326 bw_flags = IEEE80211_CHAN_NO_HT40; 1327 1328 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; 1329 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); 1330 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); 1331 } 1332 1333 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, 1334 const struct ieee80211_regdomain *regd) 1335 { 1336 unsigned int i; 1337 struct ieee80211_supported_band *sband; 1338 1339 BUG_ON(!wiphy->bands[band]); 1340 sband = wiphy->bands[band]; 1341 1342 for (i = 0; i < sband->n_channels; i++) 1343 handle_channel_custom(wiphy, band, i, regd); 1344 } 1345 1346 /* Used by drivers prior to wiphy registration */ 1347 void wiphy_apply_custom_regulatory(struct wiphy *wiphy, 1348 const struct ieee80211_regdomain *regd) 1349 { 1350 enum ieee80211_band band; 1351 unsigned int bands_set = 0; 1352 1353 mutex_lock(®_mutex); 1354 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1355 if (!wiphy->bands[band]) 1356 continue; 1357 handle_band_custom(wiphy, band, regd); 1358 bands_set++; 1359 } 1360 mutex_unlock(®_mutex); 1361 1362 /* 1363 * no point in calling this if it won't have any effect 1364 * on your device's supportd bands. 1365 */ 1366 WARN_ON(!bands_set); 1367 } 1368 EXPORT_SYMBOL(wiphy_apply_custom_regulatory); 1369 1370 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, 1371 const struct ieee80211_regdomain *src_regd) 1372 { 1373 struct ieee80211_regdomain *regd; 1374 int size_of_regd = 0; 1375 unsigned int i; 1376 1377 size_of_regd = sizeof(struct ieee80211_regdomain) + 1378 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); 1379 1380 regd = kzalloc(size_of_regd, GFP_KERNEL); 1381 if (!regd) 1382 return -ENOMEM; 1383 1384 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); 1385 1386 for (i = 0; i < src_regd->n_reg_rules; i++) 1387 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], 1388 sizeof(struct ieee80211_reg_rule)); 1389 1390 *dst_regd = regd; 1391 return 0; 1392 } 1393 1394 /* 1395 * Return value which can be used by ignore_request() to indicate 1396 * it has been determined we should intersect two regulatory domains 1397 */ 1398 #define REG_INTERSECT 1 1399 1400 /* This has the logic which determines when a new request 1401 * should be ignored. */ 1402 static int ignore_request(struct wiphy *wiphy, 1403 struct regulatory_request *pending_request) 1404 { 1405 struct wiphy *last_wiphy = NULL; 1406 1407 assert_cfg80211_lock(); 1408 1409 /* All initial requests are respected */ 1410 if (!last_request) 1411 return 0; 1412 1413 switch (pending_request->initiator) { 1414 case NL80211_REGDOM_SET_BY_CORE: 1415 return -EINVAL; 1416 case NL80211_REGDOM_SET_BY_COUNTRY_IE: 1417 1418 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 1419 1420 if (unlikely(!is_an_alpha2(pending_request->alpha2))) 1421 return -EINVAL; 1422 if (last_request->initiator == 1423 NL80211_REGDOM_SET_BY_COUNTRY_IE) { 1424 if (last_wiphy != wiphy) { 1425 /* 1426 * Two cards with two APs claiming different 1427 * Country IE alpha2s. We could 1428 * intersect them, but that seems unlikely 1429 * to be correct. Reject second one for now. 1430 */ 1431 if (regdom_changes(pending_request->alpha2)) 1432 return -EOPNOTSUPP; 1433 return -EALREADY; 1434 } 1435 /* 1436 * Two consecutive Country IE hints on the same wiphy. 1437 * This should be picked up early by the driver/stack 1438 */ 1439 if (WARN_ON(regdom_changes(pending_request->alpha2))) 1440 return 0; 1441 return -EALREADY; 1442 } 1443 return REG_INTERSECT; 1444 case NL80211_REGDOM_SET_BY_DRIVER: 1445 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { 1446 if (is_old_static_regdom(cfg80211_regdomain)) 1447 return 0; 1448 if (regdom_changes(pending_request->alpha2)) 1449 return 0; 1450 return -EALREADY; 1451 } 1452 1453 /* 1454 * This would happen if you unplug and plug your card 1455 * back in or if you add a new device for which the previously 1456 * loaded card also agrees on the regulatory domain. 1457 */ 1458 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && 1459 !regdom_changes(pending_request->alpha2)) 1460 return -EALREADY; 1461 1462 return REG_INTERSECT; 1463 case NL80211_REGDOM_SET_BY_USER: 1464 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) 1465 return REG_INTERSECT; 1466 /* 1467 * If the user knows better the user should set the regdom 1468 * to their country before the IE is picked up 1469 */ 1470 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && 1471 last_request->intersect) 1472 return -EOPNOTSUPP; 1473 /* 1474 * Process user requests only after previous user/driver/core 1475 * requests have been processed 1476 */ 1477 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || 1478 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || 1479 last_request->initiator == NL80211_REGDOM_SET_BY_USER) { 1480 if (regdom_changes(last_request->alpha2)) 1481 return -EAGAIN; 1482 } 1483 1484 if (!is_old_static_regdom(cfg80211_regdomain) && 1485 !regdom_changes(pending_request->alpha2)) 1486 return -EALREADY; 1487 1488 return 0; 1489 } 1490 1491 return -EINVAL; 1492 } 1493 1494 /** 1495 * __regulatory_hint - hint to the wireless core a regulatory domain 1496 * @wiphy: if the hint comes from country information from an AP, this 1497 * is required to be set to the wiphy that received the information 1498 * @pending_request: the regulatory request currently being processed 1499 * 1500 * The Wireless subsystem can use this function to hint to the wireless core 1501 * what it believes should be the current regulatory domain. 1502 * 1503 * Returns zero if all went fine, %-EALREADY if a regulatory domain had 1504 * already been set or other standard error codes. 1505 * 1506 * Caller must hold &cfg80211_mutex and ®_mutex 1507 */ 1508 static int __regulatory_hint(struct wiphy *wiphy, 1509 struct regulatory_request *pending_request) 1510 { 1511 bool intersect = false; 1512 int r = 0; 1513 1514 assert_cfg80211_lock(); 1515 1516 r = ignore_request(wiphy, pending_request); 1517 1518 if (r == REG_INTERSECT) { 1519 if (pending_request->initiator == 1520 NL80211_REGDOM_SET_BY_DRIVER) { 1521 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); 1522 if (r) { 1523 kfree(pending_request); 1524 return r; 1525 } 1526 } 1527 intersect = true; 1528 } else if (r) { 1529 /* 1530 * If the regulatory domain being requested by the 1531 * driver has already been set just copy it to the 1532 * wiphy 1533 */ 1534 if (r == -EALREADY && 1535 pending_request->initiator == 1536 NL80211_REGDOM_SET_BY_DRIVER) { 1537 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); 1538 if (r) { 1539 kfree(pending_request); 1540 return r; 1541 } 1542 r = -EALREADY; 1543 goto new_request; 1544 } 1545 kfree(pending_request); 1546 return r; 1547 } 1548 1549 new_request: 1550 kfree(last_request); 1551 1552 last_request = pending_request; 1553 last_request->intersect = intersect; 1554 1555 pending_request = NULL; 1556 1557 /* When r == REG_INTERSECT we do need to call CRDA */ 1558 if (r < 0) { 1559 /* 1560 * Since CRDA will not be called in this case as we already 1561 * have applied the requested regulatory domain before we just 1562 * inform userspace we have processed the request 1563 */ 1564 if (r == -EALREADY) 1565 nl80211_send_reg_change_event(last_request); 1566 return r; 1567 } 1568 1569 return call_crda(last_request->alpha2); 1570 } 1571 1572 /* This processes *all* regulatory hints */ 1573 static void reg_process_hint(struct regulatory_request *reg_request) 1574 { 1575 int r = 0; 1576 struct wiphy *wiphy = NULL; 1577 1578 BUG_ON(!reg_request->alpha2); 1579 1580 mutex_lock(&cfg80211_mutex); 1581 mutex_lock(®_mutex); 1582 1583 if (wiphy_idx_valid(reg_request->wiphy_idx)) 1584 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); 1585 1586 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && 1587 !wiphy) { 1588 kfree(reg_request); 1589 goto out; 1590 } 1591 1592 r = __regulatory_hint(wiphy, reg_request); 1593 /* This is required so that the orig_* parameters are saved */ 1594 if (r == -EALREADY && wiphy && wiphy->strict_regulatory) 1595 wiphy_update_regulatory(wiphy, reg_request->initiator); 1596 out: 1597 mutex_unlock(®_mutex); 1598 mutex_unlock(&cfg80211_mutex); 1599 } 1600 1601 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */ 1602 static void reg_process_pending_hints(void) 1603 { 1604 struct regulatory_request *reg_request; 1605 1606 spin_lock(®_requests_lock); 1607 while (!list_empty(®_requests_list)) { 1608 reg_request = list_first_entry(®_requests_list, 1609 struct regulatory_request, 1610 list); 1611 list_del_init(®_request->list); 1612 1613 spin_unlock(®_requests_lock); 1614 reg_process_hint(reg_request); 1615 spin_lock(®_requests_lock); 1616 } 1617 spin_unlock(®_requests_lock); 1618 } 1619 1620 /* Processes beacon hints -- this has nothing to do with country IEs */ 1621 static void reg_process_pending_beacon_hints(void) 1622 { 1623 struct cfg80211_registered_device *rdev; 1624 struct reg_beacon *pending_beacon, *tmp; 1625 1626 /* 1627 * No need to hold the reg_mutex here as we just touch wiphys 1628 * and do not read or access regulatory variables. 1629 */ 1630 mutex_lock(&cfg80211_mutex); 1631 1632 /* This goes through the _pending_ beacon list */ 1633 spin_lock_bh(®_pending_beacons_lock); 1634 1635 if (list_empty(®_pending_beacons)) { 1636 spin_unlock_bh(®_pending_beacons_lock); 1637 goto out; 1638 } 1639 1640 list_for_each_entry_safe(pending_beacon, tmp, 1641 ®_pending_beacons, list) { 1642 1643 list_del_init(&pending_beacon->list); 1644 1645 /* Applies the beacon hint to current wiphys */ 1646 list_for_each_entry(rdev, &cfg80211_rdev_list, list) 1647 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); 1648 1649 /* Remembers the beacon hint for new wiphys or reg changes */ 1650 list_add_tail(&pending_beacon->list, ®_beacon_list); 1651 } 1652 1653 spin_unlock_bh(®_pending_beacons_lock); 1654 out: 1655 mutex_unlock(&cfg80211_mutex); 1656 } 1657 1658 static void reg_todo(struct work_struct *work) 1659 { 1660 reg_process_pending_hints(); 1661 reg_process_pending_beacon_hints(); 1662 } 1663 1664 static DECLARE_WORK(reg_work, reg_todo); 1665 1666 static void queue_regulatory_request(struct regulatory_request *request) 1667 { 1668 spin_lock(®_requests_lock); 1669 list_add_tail(&request->list, ®_requests_list); 1670 spin_unlock(®_requests_lock); 1671 1672 schedule_work(®_work); 1673 } 1674 1675 /* Core regulatory hint -- happens once during cfg80211_init() */ 1676 static int regulatory_hint_core(const char *alpha2) 1677 { 1678 struct regulatory_request *request; 1679 1680 BUG_ON(last_request); 1681 1682 request = kzalloc(sizeof(struct regulatory_request), 1683 GFP_KERNEL); 1684 if (!request) 1685 return -ENOMEM; 1686 1687 request->alpha2[0] = alpha2[0]; 1688 request->alpha2[1] = alpha2[1]; 1689 request->initiator = NL80211_REGDOM_SET_BY_CORE; 1690 1691 queue_regulatory_request(request); 1692 1693 /* 1694 * This ensures last_request is populated once modules 1695 * come swinging in and calling regulatory hints and 1696 * wiphy_apply_custom_regulatory(). 1697 */ 1698 flush_scheduled_work(); 1699 1700 return 0; 1701 } 1702 1703 /* User hints */ 1704 int regulatory_hint_user(const char *alpha2) 1705 { 1706 struct regulatory_request *request; 1707 1708 BUG_ON(!alpha2); 1709 1710 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); 1711 if (!request) 1712 return -ENOMEM; 1713 1714 request->wiphy_idx = WIPHY_IDX_STALE; 1715 request->alpha2[0] = alpha2[0]; 1716 request->alpha2[1] = alpha2[1]; 1717 request->initiator = NL80211_REGDOM_SET_BY_USER, 1718 1719 queue_regulatory_request(request); 1720 1721 return 0; 1722 } 1723 1724 /* Driver hints */ 1725 int regulatory_hint(struct wiphy *wiphy, const char *alpha2) 1726 { 1727 struct regulatory_request *request; 1728 1729 BUG_ON(!alpha2); 1730 BUG_ON(!wiphy); 1731 1732 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); 1733 if (!request) 1734 return -ENOMEM; 1735 1736 request->wiphy_idx = get_wiphy_idx(wiphy); 1737 1738 /* Must have registered wiphy first */ 1739 BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); 1740 1741 request->alpha2[0] = alpha2[0]; 1742 request->alpha2[1] = alpha2[1]; 1743 request->initiator = NL80211_REGDOM_SET_BY_DRIVER; 1744 1745 queue_regulatory_request(request); 1746 1747 return 0; 1748 } 1749 EXPORT_SYMBOL(regulatory_hint); 1750 1751 /* Caller must hold reg_mutex */ 1752 static bool reg_same_country_ie_hint(struct wiphy *wiphy, 1753 u32 country_ie_checksum) 1754 { 1755 struct wiphy *request_wiphy; 1756 1757 assert_reg_lock(); 1758 1759 if (unlikely(last_request->initiator != 1760 NL80211_REGDOM_SET_BY_COUNTRY_IE)) 1761 return false; 1762 1763 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 1764 1765 if (!request_wiphy) 1766 return false; 1767 1768 if (likely(request_wiphy != wiphy)) 1769 return !country_ie_integrity_changes(country_ie_checksum); 1770 /* 1771 * We should not have let these through at this point, they 1772 * should have been picked up earlier by the first alpha2 check 1773 * on the device 1774 */ 1775 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) 1776 return true; 1777 return false; 1778 } 1779 1780 /* 1781 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and 1782 * therefore cannot iterate over the rdev list here. 1783 */ 1784 void regulatory_hint_11d(struct wiphy *wiphy, 1785 u8 *country_ie, 1786 u8 country_ie_len) 1787 { 1788 struct ieee80211_regdomain *rd = NULL; 1789 char alpha2[2]; 1790 u32 checksum = 0; 1791 enum environment_cap env = ENVIRON_ANY; 1792 struct regulatory_request *request; 1793 1794 mutex_lock(®_mutex); 1795 1796 if (unlikely(!last_request)) 1797 goto out; 1798 1799 /* IE len must be evenly divisible by 2 */ 1800 if (country_ie_len & 0x01) 1801 goto out; 1802 1803 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1804 goto out; 1805 1806 /* 1807 * Pending country IE processing, this can happen after we 1808 * call CRDA and wait for a response if a beacon was received before 1809 * we were able to process the last regulatory_hint_11d() call 1810 */ 1811 if (country_ie_regdomain) 1812 goto out; 1813 1814 alpha2[0] = country_ie[0]; 1815 alpha2[1] = country_ie[1]; 1816 1817 if (country_ie[2] == 'I') 1818 env = ENVIRON_INDOOR; 1819 else if (country_ie[2] == 'O') 1820 env = ENVIRON_OUTDOOR; 1821 1822 /* 1823 * We will run this only upon a successful connection on cfg80211. 1824 * We leave conflict resolution to the workqueue, where can hold 1825 * cfg80211_mutex. 1826 */ 1827 if (likely(last_request->initiator == 1828 NL80211_REGDOM_SET_BY_COUNTRY_IE && 1829 wiphy_idx_valid(last_request->wiphy_idx))) 1830 goto out; 1831 1832 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); 1833 if (!rd) 1834 goto out; 1835 1836 /* 1837 * This will not happen right now but we leave it here for the 1838 * the future when we want to add suspend/resume support and having 1839 * the user move to another country after doing so, or having the user 1840 * move to another AP. Right now we just trust the first AP. 1841 * 1842 * If we hit this before we add this support we want to be informed of 1843 * it as it would indicate a mistake in the current design 1844 */ 1845 if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum))) 1846 goto free_rd_out; 1847 1848 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); 1849 if (!request) 1850 goto free_rd_out; 1851 1852 /* 1853 * We keep this around for when CRDA comes back with a response so 1854 * we can intersect with that 1855 */ 1856 country_ie_regdomain = rd; 1857 1858 request->wiphy_idx = get_wiphy_idx(wiphy); 1859 request->alpha2[0] = rd->alpha2[0]; 1860 request->alpha2[1] = rd->alpha2[1]; 1861 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; 1862 request->country_ie_checksum = checksum; 1863 request->country_ie_env = env; 1864 1865 mutex_unlock(®_mutex); 1866 1867 queue_regulatory_request(request); 1868 1869 return; 1870 1871 free_rd_out: 1872 kfree(rd); 1873 out: 1874 mutex_unlock(®_mutex); 1875 } 1876 1877 static bool freq_is_chan_12_13_14(u16 freq) 1878 { 1879 if (freq == ieee80211_channel_to_frequency(12) || 1880 freq == ieee80211_channel_to_frequency(13) || 1881 freq == ieee80211_channel_to_frequency(14)) 1882 return true; 1883 return false; 1884 } 1885 1886 int regulatory_hint_found_beacon(struct wiphy *wiphy, 1887 struct ieee80211_channel *beacon_chan, 1888 gfp_t gfp) 1889 { 1890 struct reg_beacon *reg_beacon; 1891 1892 if (likely((beacon_chan->beacon_found || 1893 (beacon_chan->flags & IEEE80211_CHAN_RADAR) || 1894 (beacon_chan->band == IEEE80211_BAND_2GHZ && 1895 !freq_is_chan_12_13_14(beacon_chan->center_freq))))) 1896 return 0; 1897 1898 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); 1899 if (!reg_beacon) 1900 return -ENOMEM; 1901 1902 #ifdef CONFIG_CFG80211_REG_DEBUG 1903 printk(KERN_DEBUG "cfg80211: Found new beacon on " 1904 "frequency: %d MHz (Ch %d) on %s\n", 1905 beacon_chan->center_freq, 1906 ieee80211_frequency_to_channel(beacon_chan->center_freq), 1907 wiphy_name(wiphy)); 1908 #endif 1909 memcpy(®_beacon->chan, beacon_chan, 1910 sizeof(struct ieee80211_channel)); 1911 1912 1913 /* 1914 * Since we can be called from BH or and non-BH context 1915 * we must use spin_lock_bh() 1916 */ 1917 spin_lock_bh(®_pending_beacons_lock); 1918 list_add_tail(®_beacon->list, ®_pending_beacons); 1919 spin_unlock_bh(®_pending_beacons_lock); 1920 1921 schedule_work(®_work); 1922 1923 return 0; 1924 } 1925 1926 static void print_rd_rules(const struct ieee80211_regdomain *rd) 1927 { 1928 unsigned int i; 1929 const struct ieee80211_reg_rule *reg_rule = NULL; 1930 const struct ieee80211_freq_range *freq_range = NULL; 1931 const struct ieee80211_power_rule *power_rule = NULL; 1932 1933 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " 1934 "(max_antenna_gain, max_eirp)\n"); 1935 1936 for (i = 0; i < rd->n_reg_rules; i++) { 1937 reg_rule = &rd->reg_rules[i]; 1938 freq_range = ®_rule->freq_range; 1939 power_rule = ®_rule->power_rule; 1940 1941 /* 1942 * There may not be documentation for max antenna gain 1943 * in certain regions 1944 */ 1945 if (power_rule->max_antenna_gain) 1946 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " 1947 "(%d mBi, %d mBm)\n", 1948 freq_range->start_freq_khz, 1949 freq_range->end_freq_khz, 1950 freq_range->max_bandwidth_khz, 1951 power_rule->max_antenna_gain, 1952 power_rule->max_eirp); 1953 else 1954 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " 1955 "(N/A, %d mBm)\n", 1956 freq_range->start_freq_khz, 1957 freq_range->end_freq_khz, 1958 freq_range->max_bandwidth_khz, 1959 power_rule->max_eirp); 1960 } 1961 } 1962 1963 static void print_regdomain(const struct ieee80211_regdomain *rd) 1964 { 1965 1966 if (is_intersected_alpha2(rd->alpha2)) { 1967 1968 if (last_request->initiator == 1969 NL80211_REGDOM_SET_BY_COUNTRY_IE) { 1970 struct cfg80211_registered_device *rdev; 1971 rdev = cfg80211_rdev_by_wiphy_idx( 1972 last_request->wiphy_idx); 1973 if (rdev) { 1974 printk(KERN_INFO "cfg80211: Current regulatory " 1975 "domain updated by AP to: %c%c\n", 1976 rdev->country_ie_alpha2[0], 1977 rdev->country_ie_alpha2[1]); 1978 } else 1979 printk(KERN_INFO "cfg80211: Current regulatory " 1980 "domain intersected: \n"); 1981 } else 1982 printk(KERN_INFO "cfg80211: Current regulatory " 1983 "domain intersected: \n"); 1984 } else if (is_world_regdom(rd->alpha2)) 1985 printk(KERN_INFO "cfg80211: World regulatory " 1986 "domain updated:\n"); 1987 else { 1988 if (is_unknown_alpha2(rd->alpha2)) 1989 printk(KERN_INFO "cfg80211: Regulatory domain " 1990 "changed to driver built-in settings " 1991 "(unknown country)\n"); 1992 else 1993 printk(KERN_INFO "cfg80211: Regulatory domain " 1994 "changed to country: %c%c\n", 1995 rd->alpha2[0], rd->alpha2[1]); 1996 } 1997 print_rd_rules(rd); 1998 } 1999 2000 static void print_regdomain_info(const struct ieee80211_regdomain *rd) 2001 { 2002 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", 2003 rd->alpha2[0], rd->alpha2[1]); 2004 print_rd_rules(rd); 2005 } 2006 2007 #ifdef CONFIG_CFG80211_REG_DEBUG 2008 static void reg_country_ie_process_debug( 2009 const struct ieee80211_regdomain *rd, 2010 const struct ieee80211_regdomain *country_ie_regdomain, 2011 const struct ieee80211_regdomain *intersected_rd) 2012 { 2013 printk(KERN_DEBUG "cfg80211: Received country IE:\n"); 2014 print_regdomain_info(country_ie_regdomain); 2015 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); 2016 print_regdomain_info(rd); 2017 if (intersected_rd) { 2018 printk(KERN_DEBUG "cfg80211: We intersect both of these " 2019 "and get:\n"); 2020 print_regdomain_info(intersected_rd); 2021 return; 2022 } 2023 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); 2024 } 2025 #else 2026 static inline void reg_country_ie_process_debug( 2027 const struct ieee80211_regdomain *rd, 2028 const struct ieee80211_regdomain *country_ie_regdomain, 2029 const struct ieee80211_regdomain *intersected_rd) 2030 { 2031 } 2032 #endif 2033 2034 /* Takes ownership of rd only if it doesn't fail */ 2035 static int __set_regdom(const struct ieee80211_regdomain *rd) 2036 { 2037 const struct ieee80211_regdomain *intersected_rd = NULL; 2038 struct cfg80211_registered_device *rdev = NULL; 2039 struct wiphy *request_wiphy; 2040 /* Some basic sanity checks first */ 2041 2042 if (is_world_regdom(rd->alpha2)) { 2043 if (WARN_ON(!reg_is_valid_request(rd->alpha2))) 2044 return -EINVAL; 2045 update_world_regdomain(rd); 2046 return 0; 2047 } 2048 2049 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && 2050 !is_unknown_alpha2(rd->alpha2)) 2051 return -EINVAL; 2052 2053 if (!last_request) 2054 return -EINVAL; 2055 2056 /* 2057 * Lets only bother proceeding on the same alpha2 if the current 2058 * rd is non static (it means CRDA was present and was used last) 2059 * and the pending request came in from a country IE 2060 */ 2061 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { 2062 /* 2063 * If someone else asked us to change the rd lets only bother 2064 * checking if the alpha2 changes if CRDA was already called 2065 */ 2066 if (!is_old_static_regdom(cfg80211_regdomain) && 2067 !regdom_changes(rd->alpha2)) 2068 return -EINVAL; 2069 } 2070 2071 /* 2072 * Now lets set the regulatory domain, update all driver channels 2073 * and finally inform them of what we have done, in case they want 2074 * to review or adjust their own settings based on their own 2075 * internal EEPROM data 2076 */ 2077 2078 if (WARN_ON(!reg_is_valid_request(rd->alpha2))) 2079 return -EINVAL; 2080 2081 if (!is_valid_rd(rd)) { 2082 printk(KERN_ERR "cfg80211: Invalid " 2083 "regulatory domain detected:\n"); 2084 print_regdomain_info(rd); 2085 return -EINVAL; 2086 } 2087 2088 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 2089 2090 if (!last_request->intersect) { 2091 int r; 2092 2093 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { 2094 reset_regdomains(); 2095 cfg80211_regdomain = rd; 2096 return 0; 2097 } 2098 2099 /* 2100 * For a driver hint, lets copy the regulatory domain the 2101 * driver wanted to the wiphy to deal with conflicts 2102 */ 2103 2104 /* 2105 * Userspace could have sent two replies with only 2106 * one kernel request. 2107 */ 2108 if (request_wiphy->regd) 2109 return -EALREADY; 2110 2111 r = reg_copy_regd(&request_wiphy->regd, rd); 2112 if (r) 2113 return r; 2114 2115 reset_regdomains(); 2116 cfg80211_regdomain = rd; 2117 return 0; 2118 } 2119 2120 /* Intersection requires a bit more work */ 2121 2122 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { 2123 2124 intersected_rd = regdom_intersect(rd, cfg80211_regdomain); 2125 if (!intersected_rd) 2126 return -EINVAL; 2127 2128 /* 2129 * We can trash what CRDA provided now. 2130 * However if a driver requested this specific regulatory 2131 * domain we keep it for its private use 2132 */ 2133 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) 2134 request_wiphy->regd = rd; 2135 else 2136 kfree(rd); 2137 2138 rd = NULL; 2139 2140 reset_regdomains(); 2141 cfg80211_regdomain = intersected_rd; 2142 2143 return 0; 2144 } 2145 2146 /* 2147 * Country IE requests are handled a bit differently, we intersect 2148 * the country IE rd with what CRDA believes that country should have 2149 */ 2150 2151 /* 2152 * Userspace could have sent two replies with only 2153 * one kernel request. By the second reply we would have 2154 * already processed and consumed the country_ie_regdomain. 2155 */ 2156 if (!country_ie_regdomain) 2157 return -EALREADY; 2158 BUG_ON(rd == country_ie_regdomain); 2159 2160 /* 2161 * Intersect what CRDA returned and our what we 2162 * had built from the Country IE received 2163 */ 2164 2165 intersected_rd = regdom_intersect(rd, country_ie_regdomain); 2166 2167 reg_country_ie_process_debug(rd, 2168 country_ie_regdomain, 2169 intersected_rd); 2170 2171 kfree(country_ie_regdomain); 2172 country_ie_regdomain = NULL; 2173 2174 if (!intersected_rd) 2175 return -EINVAL; 2176 2177 rdev = wiphy_to_dev(request_wiphy); 2178 2179 rdev->country_ie_alpha2[0] = rd->alpha2[0]; 2180 rdev->country_ie_alpha2[1] = rd->alpha2[1]; 2181 rdev->env = last_request->country_ie_env; 2182 2183 BUG_ON(intersected_rd == rd); 2184 2185 kfree(rd); 2186 rd = NULL; 2187 2188 reset_regdomains(); 2189 cfg80211_regdomain = intersected_rd; 2190 2191 return 0; 2192 } 2193 2194 2195 /* 2196 * Use this call to set the current regulatory domain. Conflicts with 2197 * multiple drivers can be ironed out later. Caller must've already 2198 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex 2199 */ 2200 int set_regdom(const struct ieee80211_regdomain *rd) 2201 { 2202 int r; 2203 2204 assert_cfg80211_lock(); 2205 2206 mutex_lock(®_mutex); 2207 2208 /* Note that this doesn't update the wiphys, this is done below */ 2209 r = __set_regdom(rd); 2210 if (r) { 2211 kfree(rd); 2212 mutex_unlock(®_mutex); 2213 return r; 2214 } 2215 2216 /* This would make this whole thing pointless */ 2217 if (!last_request->intersect) 2218 BUG_ON(rd != cfg80211_regdomain); 2219 2220 /* update all wiphys now with the new established regulatory domain */ 2221 update_all_wiphy_regulatory(last_request->initiator); 2222 2223 print_regdomain(cfg80211_regdomain); 2224 2225 nl80211_send_reg_change_event(last_request); 2226 2227 mutex_unlock(®_mutex); 2228 2229 return r; 2230 } 2231 2232 /* Caller must hold cfg80211_mutex */ 2233 void reg_device_remove(struct wiphy *wiphy) 2234 { 2235 struct wiphy *request_wiphy = NULL; 2236 2237 assert_cfg80211_lock(); 2238 2239 mutex_lock(®_mutex); 2240 2241 kfree(wiphy->regd); 2242 2243 if (last_request) 2244 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 2245 2246 if (!request_wiphy || request_wiphy != wiphy) 2247 goto out; 2248 2249 last_request->wiphy_idx = WIPHY_IDX_STALE; 2250 last_request->country_ie_env = ENVIRON_ANY; 2251 out: 2252 mutex_unlock(®_mutex); 2253 } 2254 2255 int regulatory_init(void) 2256 { 2257 int err = 0; 2258 2259 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); 2260 if (IS_ERR(reg_pdev)) 2261 return PTR_ERR(reg_pdev); 2262 2263 spin_lock_init(®_requests_lock); 2264 spin_lock_init(®_pending_beacons_lock); 2265 2266 #ifdef CONFIG_WIRELESS_OLD_REGULATORY 2267 cfg80211_regdomain = static_regdom(ieee80211_regdom); 2268 2269 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); 2270 print_regdomain_info(cfg80211_regdomain); 2271 #else 2272 cfg80211_regdomain = cfg80211_world_regdom; 2273 2274 #endif 2275 /* We always try to get an update for the static regdomain */ 2276 err = regulatory_hint_core(cfg80211_regdomain->alpha2); 2277 if (err) { 2278 if (err == -ENOMEM) 2279 return err; 2280 /* 2281 * N.B. kobject_uevent_env() can fail mainly for when we're out 2282 * memory which is handled and propagated appropriately above 2283 * but it can also fail during a netlink_broadcast() or during 2284 * early boot for call_usermodehelper(). For now treat these 2285 * errors as non-fatal. 2286 */ 2287 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " 2288 "to call CRDA during init"); 2289 #ifdef CONFIG_CFG80211_REG_DEBUG 2290 /* We want to find out exactly why when debugging */ 2291 WARN_ON(err); 2292 #endif 2293 } 2294 2295 /* 2296 * Finally, if the user set the module parameter treat it 2297 * as a user hint. 2298 */ 2299 if (!is_world_regdom(ieee80211_regdom)) 2300 regulatory_hint_user(ieee80211_regdom); 2301 2302 return 0; 2303 } 2304 2305 void regulatory_exit(void) 2306 { 2307 struct regulatory_request *reg_request, *tmp; 2308 struct reg_beacon *reg_beacon, *btmp; 2309 2310 cancel_work_sync(®_work); 2311 2312 mutex_lock(&cfg80211_mutex); 2313 mutex_lock(®_mutex); 2314 2315 reset_regdomains(); 2316 2317 kfree(country_ie_regdomain); 2318 country_ie_regdomain = NULL; 2319 2320 kfree(last_request); 2321 2322 platform_device_unregister(reg_pdev); 2323 2324 spin_lock_bh(®_pending_beacons_lock); 2325 if (!list_empty(®_pending_beacons)) { 2326 list_for_each_entry_safe(reg_beacon, btmp, 2327 ®_pending_beacons, list) { 2328 list_del(®_beacon->list); 2329 kfree(reg_beacon); 2330 } 2331 } 2332 spin_unlock_bh(®_pending_beacons_lock); 2333 2334 if (!list_empty(®_beacon_list)) { 2335 list_for_each_entry_safe(reg_beacon, btmp, 2336 ®_beacon_list, list) { 2337 list_del(®_beacon->list); 2338 kfree(reg_beacon); 2339 } 2340 } 2341 2342 spin_lock(®_requests_lock); 2343 if (!list_empty(®_requests_list)) { 2344 list_for_each_entry_safe(reg_request, tmp, 2345 ®_requests_list, list) { 2346 list_del(®_request->list); 2347 kfree(reg_request); 2348 } 2349 } 2350 spin_unlock(®_requests_lock); 2351 2352 mutex_unlock(®_mutex); 2353 mutex_unlock(&cfg80211_mutex); 2354 } 2355