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/wireless.h> 41 #include <net/cfg80211.h> 42 #include "core.h" 43 #include "reg.h" 44 #include "nl80211.h" 45 46 /* Receipt of information from last regulatory request */ 47 static struct regulatory_request *last_request; 48 49 /* To trigger userspace events */ 50 static struct platform_device *reg_pdev; 51 52 /* Keep the ordering from large to small */ 53 static u32 supported_bandwidths[] = { 54 MHZ_TO_KHZ(40), 55 MHZ_TO_KHZ(20), 56 }; 57 58 /* 59 * Central wireless core regulatory domains, we only need two, 60 * the current one and a world regulatory domain in case we have no 61 * information to give us an alpha2 62 */ 63 const struct ieee80211_regdomain *cfg80211_regdomain; 64 65 /* 66 * We use this as a place for the rd structure built from the 67 * last parsed country IE to rest until CRDA gets back to us with 68 * what it thinks should apply for the same country 69 */ 70 static const struct ieee80211_regdomain *country_ie_regdomain; 71 72 /* Used to queue up regulatory hints */ 73 static LIST_HEAD(reg_requests_list); 74 static spinlock_t reg_requests_lock; 75 76 /* Used to queue up beacon hints for review */ 77 static LIST_HEAD(reg_pending_beacons); 78 static spinlock_t reg_pending_beacons_lock; 79 80 /* Used to keep track of processed beacon hints */ 81 static LIST_HEAD(reg_beacon_list); 82 83 struct reg_beacon { 84 struct list_head list; 85 struct ieee80211_channel chan; 86 }; 87 88 /* We keep a static world regulatory domain in case of the absence of CRDA */ 89 static const struct ieee80211_regdomain world_regdom = { 90 .n_reg_rules = 5, 91 .alpha2 = "00", 92 .reg_rules = { 93 /* IEEE 802.11b/g, channels 1..11 */ 94 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), 95 /* IEEE 802.11b/g, channels 12..13. No HT40 96 * channel fits here. */ 97 REG_RULE(2467-10, 2472+10, 20, 6, 20, 98 NL80211_RRF_PASSIVE_SCAN | 99 NL80211_RRF_NO_IBSS), 100 /* IEEE 802.11 channel 14 - Only JP enables 101 * this and for 802.11b only */ 102 REG_RULE(2484-10, 2484+10, 20, 6, 20, 103 NL80211_RRF_PASSIVE_SCAN | 104 NL80211_RRF_NO_IBSS | 105 NL80211_RRF_NO_OFDM), 106 /* IEEE 802.11a, channel 36..48 */ 107 REG_RULE(5180-10, 5240+10, 40, 6, 20, 108 NL80211_RRF_PASSIVE_SCAN | 109 NL80211_RRF_NO_IBSS), 110 111 /* NB: 5260 MHz - 5700 MHz requies DFS */ 112 113 /* IEEE 802.11a, channel 149..165 */ 114 REG_RULE(5745-10, 5825+10, 40, 6, 20, 115 NL80211_RRF_PASSIVE_SCAN | 116 NL80211_RRF_NO_IBSS), 117 } 118 }; 119 120 static const struct ieee80211_regdomain *cfg80211_world_regdom = 121 &world_regdom; 122 123 #ifdef CONFIG_WIRELESS_OLD_REGULATORY 124 static char *ieee80211_regdom = "US"; 125 #else 126 static char *ieee80211_regdom = "00"; 127 #endif 128 129 module_param(ieee80211_regdom, charp, 0444); 130 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); 131 132 #ifdef CONFIG_WIRELESS_OLD_REGULATORY 133 /* 134 * We assume 40 MHz bandwidth for the old regulatory work. 135 * We make emphasis we are using the exact same frequencies 136 * as before 137 */ 138 139 static const struct ieee80211_regdomain us_regdom = { 140 .n_reg_rules = 6, 141 .alpha2 = "US", 142 .reg_rules = { 143 /* IEEE 802.11b/g, channels 1..11 */ 144 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), 145 /* IEEE 802.11a, channel 36 */ 146 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), 147 /* IEEE 802.11a, channel 40 */ 148 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), 149 /* IEEE 802.11a, channel 44 */ 150 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), 151 /* IEEE 802.11a, channels 48..64 */ 152 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), 153 /* IEEE 802.11a, channels 149..165, outdoor */ 154 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), 155 } 156 }; 157 158 static const struct ieee80211_regdomain jp_regdom = { 159 .n_reg_rules = 3, 160 .alpha2 = "JP", 161 .reg_rules = { 162 /* IEEE 802.11b/g, channels 1..14 */ 163 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), 164 /* IEEE 802.11a, channels 34..48 */ 165 REG_RULE(5170-10, 5240+10, 40, 6, 20, 166 NL80211_RRF_PASSIVE_SCAN), 167 /* IEEE 802.11a, channels 52..64 */ 168 REG_RULE(5260-10, 5320+10, 40, 6, 20, 169 NL80211_RRF_NO_IBSS | 170 NL80211_RRF_DFS), 171 } 172 }; 173 174 static const struct ieee80211_regdomain eu_regdom = { 175 .n_reg_rules = 6, 176 /* 177 * This alpha2 is bogus, we leave it here just for stupid 178 * backward compatibility 179 */ 180 .alpha2 = "EU", 181 .reg_rules = { 182 /* IEEE 802.11b/g, channels 1..13 */ 183 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), 184 /* IEEE 802.11a, channel 36 */ 185 REG_RULE(5180-10, 5180+10, 40, 6, 23, 186 NL80211_RRF_PASSIVE_SCAN), 187 /* IEEE 802.11a, channel 40 */ 188 REG_RULE(5200-10, 5200+10, 40, 6, 23, 189 NL80211_RRF_PASSIVE_SCAN), 190 /* IEEE 802.11a, channel 44 */ 191 REG_RULE(5220-10, 5220+10, 40, 6, 23, 192 NL80211_RRF_PASSIVE_SCAN), 193 /* IEEE 802.11a, channels 48..64 */ 194 REG_RULE(5240-10, 5320+10, 40, 6, 20, 195 NL80211_RRF_NO_IBSS | 196 NL80211_RRF_DFS), 197 /* IEEE 802.11a, channels 100..140 */ 198 REG_RULE(5500-10, 5700+10, 40, 6, 30, 199 NL80211_RRF_NO_IBSS | 200 NL80211_RRF_DFS), 201 } 202 }; 203 204 static const struct ieee80211_regdomain *static_regdom(char *alpha2) 205 { 206 if (alpha2[0] == 'U' && alpha2[1] == 'S') 207 return &us_regdom; 208 if (alpha2[0] == 'J' && alpha2[1] == 'P') 209 return &jp_regdom; 210 if (alpha2[0] == 'E' && alpha2[1] == 'U') 211 return &eu_regdom; 212 /* Default, as per the old rules */ 213 return &us_regdom; 214 } 215 216 static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) 217 { 218 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) 219 return true; 220 return false; 221 } 222 #else 223 static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) 224 { 225 return false; 226 } 227 #endif 228 229 static void reset_regdomains(void) 230 { 231 /* avoid freeing static information or freeing something twice */ 232 if (cfg80211_regdomain == cfg80211_world_regdom) 233 cfg80211_regdomain = NULL; 234 if (cfg80211_world_regdom == &world_regdom) 235 cfg80211_world_regdom = NULL; 236 if (cfg80211_regdomain == &world_regdom) 237 cfg80211_regdomain = NULL; 238 if (is_old_static_regdom(cfg80211_regdomain)) 239 cfg80211_regdomain = NULL; 240 241 kfree(cfg80211_regdomain); 242 kfree(cfg80211_world_regdom); 243 244 cfg80211_world_regdom = &world_regdom; 245 cfg80211_regdomain = NULL; 246 } 247 248 /* 249 * Dynamic world regulatory domain requested by the wireless 250 * core upon initialization 251 */ 252 static void update_world_regdomain(const struct ieee80211_regdomain *rd) 253 { 254 BUG_ON(!last_request); 255 256 reset_regdomains(); 257 258 cfg80211_world_regdom = rd; 259 cfg80211_regdomain = rd; 260 } 261 262 bool is_world_regdom(const char *alpha2) 263 { 264 if (!alpha2) 265 return false; 266 if (alpha2[0] == '0' && alpha2[1] == '0') 267 return true; 268 return false; 269 } 270 271 static bool is_alpha2_set(const char *alpha2) 272 { 273 if (!alpha2) 274 return false; 275 if (alpha2[0] != 0 && alpha2[1] != 0) 276 return true; 277 return false; 278 } 279 280 static bool is_alpha_upper(char letter) 281 { 282 /* ASCII A - Z */ 283 if (letter >= 65 && letter <= 90) 284 return true; 285 return false; 286 } 287 288 static bool is_unknown_alpha2(const char *alpha2) 289 { 290 if (!alpha2) 291 return false; 292 /* 293 * Special case where regulatory domain was built by driver 294 * but a specific alpha2 cannot be determined 295 */ 296 if (alpha2[0] == '9' && alpha2[1] == '9') 297 return true; 298 return false; 299 } 300 301 static bool is_intersected_alpha2(const char *alpha2) 302 { 303 if (!alpha2) 304 return false; 305 /* 306 * Special case where regulatory domain is the 307 * result of an intersection between two regulatory domain 308 * structures 309 */ 310 if (alpha2[0] == '9' && alpha2[1] == '8') 311 return true; 312 return false; 313 } 314 315 static bool is_an_alpha2(const char *alpha2) 316 { 317 if (!alpha2) 318 return false; 319 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) 320 return true; 321 return false; 322 } 323 324 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) 325 { 326 if (!alpha2_x || !alpha2_y) 327 return false; 328 if (alpha2_x[0] == alpha2_y[0] && 329 alpha2_x[1] == alpha2_y[1]) 330 return true; 331 return false; 332 } 333 334 static bool regdom_changes(const char *alpha2) 335 { 336 assert_cfg80211_lock(); 337 338 if (!cfg80211_regdomain) 339 return true; 340 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) 341 return false; 342 return true; 343 } 344 345 /** 346 * country_ie_integrity_changes - tells us if the country IE has changed 347 * @checksum: checksum of country IE of fields we are interested in 348 * 349 * If the country IE has not changed you can ignore it safely. This is 350 * useful to determine if two devices are seeing two different country IEs 351 * even on the same alpha2. Note that this will return false if no IE has 352 * been set on the wireless core yet. 353 */ 354 static bool country_ie_integrity_changes(u32 checksum) 355 { 356 /* If no IE has been set then the checksum doesn't change */ 357 if (unlikely(!last_request->country_ie_checksum)) 358 return false; 359 if (unlikely(last_request->country_ie_checksum != checksum)) 360 return true; 361 return false; 362 } 363 364 /* 365 * This lets us keep regulatory code which is updated on a regulatory 366 * basis in userspace. 367 */ 368 static int call_crda(const char *alpha2) 369 { 370 char country_env[9 + 2] = "COUNTRY="; 371 char *envp[] = { 372 country_env, 373 NULL 374 }; 375 376 if (!is_world_regdom((char *) alpha2)) 377 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", 378 alpha2[0], alpha2[1]); 379 else 380 printk(KERN_INFO "cfg80211: Calling CRDA to update world " 381 "regulatory domain\n"); 382 383 country_env[8] = alpha2[0]; 384 country_env[9] = alpha2[1]; 385 386 return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); 387 } 388 389 /* Used by nl80211 before kmalloc'ing our regulatory domain */ 390 bool reg_is_valid_request(const char *alpha2) 391 { 392 if (!last_request) 393 return false; 394 395 return alpha2_equal(last_request->alpha2, alpha2); 396 } 397 398 /* Sanity check on a regulatory rule */ 399 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) 400 { 401 const struct ieee80211_freq_range *freq_range = &rule->freq_range; 402 u32 freq_diff; 403 404 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) 405 return false; 406 407 if (freq_range->start_freq_khz > freq_range->end_freq_khz) 408 return false; 409 410 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; 411 412 if (freq_range->end_freq_khz <= freq_range->start_freq_khz || 413 freq_range->max_bandwidth_khz > freq_diff) 414 return false; 415 416 return true; 417 } 418 419 static bool is_valid_rd(const struct ieee80211_regdomain *rd) 420 { 421 const struct ieee80211_reg_rule *reg_rule = NULL; 422 unsigned int i; 423 424 if (!rd->n_reg_rules) 425 return false; 426 427 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) 428 return false; 429 430 for (i = 0; i < rd->n_reg_rules; i++) { 431 reg_rule = &rd->reg_rules[i]; 432 if (!is_valid_reg_rule(reg_rule)) 433 return false; 434 } 435 436 return true; 437 } 438 439 /* Returns value in KHz */ 440 static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, 441 u32 freq) 442 { 443 unsigned int i; 444 for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { 445 u32 start_freq_khz = freq - supported_bandwidths[i]/2; 446 u32 end_freq_khz = freq + supported_bandwidths[i]/2; 447 if (start_freq_khz >= freq_range->start_freq_khz && 448 end_freq_khz <= freq_range->end_freq_khz) 449 return supported_bandwidths[i]; 450 } 451 return 0; 452 } 453 454 /** 455 * freq_in_rule_band - tells us if a frequency is in a frequency band 456 * @freq_range: frequency rule we want to query 457 * @freq_khz: frequency we are inquiring about 458 * 459 * This lets us know if a specific frequency rule is or is not relevant to 460 * a specific frequency's band. Bands are device specific and artificial 461 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is 462 * safe for now to assume that a frequency rule should not be part of a 463 * frequency's band if the start freq or end freq are off by more than 2 GHz. 464 * This resolution can be lowered and should be considered as we add 465 * regulatory rule support for other "bands". 466 **/ 467 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, 468 u32 freq_khz) 469 { 470 #define ONE_GHZ_IN_KHZ 1000000 471 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) 472 return true; 473 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) 474 return true; 475 return false; 476 #undef ONE_GHZ_IN_KHZ 477 } 478 479 /* 480 * Converts a country IE to a regulatory domain. A regulatory domain 481 * structure has a lot of information which the IE doesn't yet have, 482 * so for the other values we use upper max values as we will intersect 483 * with our userspace regulatory agent to get lower bounds. 484 */ 485 static struct ieee80211_regdomain *country_ie_2_rd( 486 u8 *country_ie, 487 u8 country_ie_len, 488 u32 *checksum) 489 { 490 struct ieee80211_regdomain *rd = NULL; 491 unsigned int i = 0; 492 char alpha2[2]; 493 u32 flags = 0; 494 u32 num_rules = 0, size_of_regd = 0; 495 u8 *triplets_start = NULL; 496 u8 len_at_triplet = 0; 497 /* the last channel we have registered in a subband (triplet) */ 498 int last_sub_max_channel = 0; 499 500 *checksum = 0xDEADBEEF; 501 502 /* Country IE requirements */ 503 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || 504 country_ie_len & 0x01); 505 506 alpha2[0] = country_ie[0]; 507 alpha2[1] = country_ie[1]; 508 509 /* 510 * Third octet can be: 511 * 'I' - Indoor 512 * 'O' - Outdoor 513 * 514 * anything else we assume is no restrictions 515 */ 516 if (country_ie[2] == 'I') 517 flags = NL80211_RRF_NO_OUTDOOR; 518 else if (country_ie[2] == 'O') 519 flags = NL80211_RRF_NO_INDOOR; 520 521 country_ie += 3; 522 country_ie_len -= 3; 523 524 triplets_start = country_ie; 525 len_at_triplet = country_ie_len; 526 527 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); 528 529 /* 530 * We need to build a reg rule for each triplet, but first we must 531 * calculate the number of reg rules we will need. We will need one 532 * for each channel subband 533 */ 534 while (country_ie_len >= 3) { 535 int end_channel = 0; 536 struct ieee80211_country_ie_triplet *triplet = 537 (struct ieee80211_country_ie_triplet *) country_ie; 538 int cur_sub_max_channel = 0, cur_channel = 0; 539 540 if (triplet->ext.reg_extension_id >= 541 IEEE80211_COUNTRY_EXTENSION_ID) { 542 country_ie += 3; 543 country_ie_len -= 3; 544 continue; 545 } 546 547 /* 2 GHz */ 548 if (triplet->chans.first_channel <= 14) 549 end_channel = triplet->chans.first_channel + 550 triplet->chans.num_channels; 551 else 552 /* 553 * 5 GHz -- For example in country IEs if the first 554 * channel given is 36 and the number of channels is 4 555 * then the individual channel numbers defined for the 556 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 557 * and not 36, 37, 38, 39. 558 * 559 * See: http://tinyurl.com/11d-clarification 560 */ 561 end_channel = triplet->chans.first_channel + 562 (4 * (triplet->chans.num_channels - 1)); 563 564 cur_channel = triplet->chans.first_channel; 565 cur_sub_max_channel = end_channel; 566 567 /* Basic sanity check */ 568 if (cur_sub_max_channel < cur_channel) 569 return NULL; 570 571 /* 572 * Do not allow overlapping channels. Also channels 573 * passed in each subband must be monotonically 574 * increasing 575 */ 576 if (last_sub_max_channel) { 577 if (cur_channel <= last_sub_max_channel) 578 return NULL; 579 if (cur_sub_max_channel <= last_sub_max_channel) 580 return NULL; 581 } 582 583 /* 584 * When dot11RegulatoryClassesRequired is supported 585 * we can throw ext triplets as part of this soup, 586 * for now we don't care when those change as we 587 * don't support them 588 */ 589 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | 590 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | 591 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); 592 593 last_sub_max_channel = cur_sub_max_channel; 594 595 country_ie += 3; 596 country_ie_len -= 3; 597 num_rules++; 598 599 /* 600 * Note: this is not a IEEE requirement but 601 * simply a memory requirement 602 */ 603 if (num_rules > NL80211_MAX_SUPP_REG_RULES) 604 return NULL; 605 } 606 607 country_ie = triplets_start; 608 country_ie_len = len_at_triplet; 609 610 size_of_regd = sizeof(struct ieee80211_regdomain) + 611 (num_rules * sizeof(struct ieee80211_reg_rule)); 612 613 rd = kzalloc(size_of_regd, GFP_KERNEL); 614 if (!rd) 615 return NULL; 616 617 rd->n_reg_rules = num_rules; 618 rd->alpha2[0] = alpha2[0]; 619 rd->alpha2[1] = alpha2[1]; 620 621 /* This time around we fill in the rd */ 622 while (country_ie_len >= 3) { 623 int end_channel = 0; 624 struct ieee80211_country_ie_triplet *triplet = 625 (struct ieee80211_country_ie_triplet *) country_ie; 626 struct ieee80211_reg_rule *reg_rule = NULL; 627 struct ieee80211_freq_range *freq_range = NULL; 628 struct ieee80211_power_rule *power_rule = NULL; 629 630 /* 631 * Must parse if dot11RegulatoryClassesRequired is true, 632 * we don't support this yet 633 */ 634 if (triplet->ext.reg_extension_id >= 635 IEEE80211_COUNTRY_EXTENSION_ID) { 636 country_ie += 3; 637 country_ie_len -= 3; 638 continue; 639 } 640 641 reg_rule = &rd->reg_rules[i]; 642 freq_range = ®_rule->freq_range; 643 power_rule = ®_rule->power_rule; 644 645 reg_rule->flags = flags; 646 647 /* 2 GHz */ 648 if (triplet->chans.first_channel <= 14) 649 end_channel = triplet->chans.first_channel + 650 triplet->chans.num_channels; 651 else 652 end_channel = triplet->chans.first_channel + 653 (4 * (triplet->chans.num_channels - 1)); 654 655 /* 656 * The +10 is since the regulatory domain expects 657 * the actual band edge, not the center of freq for 658 * its start and end freqs, assuming 20 MHz bandwidth on 659 * the channels passed 660 */ 661 freq_range->start_freq_khz = 662 MHZ_TO_KHZ(ieee80211_channel_to_frequency( 663 triplet->chans.first_channel) - 10); 664 freq_range->end_freq_khz = 665 MHZ_TO_KHZ(ieee80211_channel_to_frequency( 666 end_channel) + 10); 667 668 /* 669 * These are large arbitrary values we use to intersect later. 670 * Increment this if we ever support >= 40 MHz channels 671 * in IEEE 802.11 672 */ 673 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); 674 power_rule->max_antenna_gain = DBI_TO_MBI(100); 675 power_rule->max_eirp = DBM_TO_MBM(100); 676 677 country_ie += 3; 678 country_ie_len -= 3; 679 i++; 680 681 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); 682 } 683 684 return rd; 685 } 686 687 688 /* 689 * Helper for regdom_intersect(), this does the real 690 * mathematical intersection fun 691 */ 692 static int reg_rules_intersect( 693 const struct ieee80211_reg_rule *rule1, 694 const struct ieee80211_reg_rule *rule2, 695 struct ieee80211_reg_rule *intersected_rule) 696 { 697 const struct ieee80211_freq_range *freq_range1, *freq_range2; 698 struct ieee80211_freq_range *freq_range; 699 const struct ieee80211_power_rule *power_rule1, *power_rule2; 700 struct ieee80211_power_rule *power_rule; 701 u32 freq_diff; 702 703 freq_range1 = &rule1->freq_range; 704 freq_range2 = &rule2->freq_range; 705 freq_range = &intersected_rule->freq_range; 706 707 power_rule1 = &rule1->power_rule; 708 power_rule2 = &rule2->power_rule; 709 power_rule = &intersected_rule->power_rule; 710 711 freq_range->start_freq_khz = max(freq_range1->start_freq_khz, 712 freq_range2->start_freq_khz); 713 freq_range->end_freq_khz = min(freq_range1->end_freq_khz, 714 freq_range2->end_freq_khz); 715 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, 716 freq_range2->max_bandwidth_khz); 717 718 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; 719 if (freq_range->max_bandwidth_khz > freq_diff) 720 freq_range->max_bandwidth_khz = freq_diff; 721 722 power_rule->max_eirp = min(power_rule1->max_eirp, 723 power_rule2->max_eirp); 724 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, 725 power_rule2->max_antenna_gain); 726 727 intersected_rule->flags = (rule1->flags | rule2->flags); 728 729 if (!is_valid_reg_rule(intersected_rule)) 730 return -EINVAL; 731 732 return 0; 733 } 734 735 /** 736 * regdom_intersect - do the intersection between two regulatory domains 737 * @rd1: first regulatory domain 738 * @rd2: second regulatory domain 739 * 740 * Use this function to get the intersection between two regulatory domains. 741 * Once completed we will mark the alpha2 for the rd as intersected, "98", 742 * as no one single alpha2 can represent this regulatory domain. 743 * 744 * Returns a pointer to the regulatory domain structure which will hold the 745 * resulting intersection of rules between rd1 and rd2. We will 746 * kzalloc() this structure for you. 747 */ 748 static struct ieee80211_regdomain *regdom_intersect( 749 const struct ieee80211_regdomain *rd1, 750 const struct ieee80211_regdomain *rd2) 751 { 752 int r, size_of_regd; 753 unsigned int x, y; 754 unsigned int num_rules = 0, rule_idx = 0; 755 const struct ieee80211_reg_rule *rule1, *rule2; 756 struct ieee80211_reg_rule *intersected_rule; 757 struct ieee80211_regdomain *rd; 758 /* This is just a dummy holder to help us count */ 759 struct ieee80211_reg_rule irule; 760 761 /* Uses the stack temporarily for counter arithmetic */ 762 intersected_rule = &irule; 763 764 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); 765 766 if (!rd1 || !rd2) 767 return NULL; 768 769 /* 770 * First we get a count of the rules we'll need, then we actually 771 * build them. This is to so we can malloc() and free() a 772 * regdomain once. The reason we use reg_rules_intersect() here 773 * is it will return -EINVAL if the rule computed makes no sense. 774 * All rules that do check out OK are valid. 775 */ 776 777 for (x = 0; x < rd1->n_reg_rules; x++) { 778 rule1 = &rd1->reg_rules[x]; 779 for (y = 0; y < rd2->n_reg_rules; y++) { 780 rule2 = &rd2->reg_rules[y]; 781 if (!reg_rules_intersect(rule1, rule2, 782 intersected_rule)) 783 num_rules++; 784 memset(intersected_rule, 0, 785 sizeof(struct ieee80211_reg_rule)); 786 } 787 } 788 789 if (!num_rules) 790 return NULL; 791 792 size_of_regd = sizeof(struct ieee80211_regdomain) + 793 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); 794 795 rd = kzalloc(size_of_regd, GFP_KERNEL); 796 if (!rd) 797 return NULL; 798 799 for (x = 0; x < rd1->n_reg_rules; x++) { 800 rule1 = &rd1->reg_rules[x]; 801 for (y = 0; y < rd2->n_reg_rules; y++) { 802 rule2 = &rd2->reg_rules[y]; 803 /* 804 * This time around instead of using the stack lets 805 * write to the target rule directly saving ourselves 806 * a memcpy() 807 */ 808 intersected_rule = &rd->reg_rules[rule_idx]; 809 r = reg_rules_intersect(rule1, rule2, 810 intersected_rule); 811 /* 812 * No need to memset here the intersected rule here as 813 * we're not using the stack anymore 814 */ 815 if (r) 816 continue; 817 rule_idx++; 818 } 819 } 820 821 if (rule_idx != num_rules) { 822 kfree(rd); 823 return NULL; 824 } 825 826 rd->n_reg_rules = num_rules; 827 rd->alpha2[0] = '9'; 828 rd->alpha2[1] = '8'; 829 830 return rd; 831 } 832 833 /* 834 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may 835 * want to just have the channel structure use these 836 */ 837 static u32 map_regdom_flags(u32 rd_flags) 838 { 839 u32 channel_flags = 0; 840 if (rd_flags & NL80211_RRF_PASSIVE_SCAN) 841 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; 842 if (rd_flags & NL80211_RRF_NO_IBSS) 843 channel_flags |= IEEE80211_CHAN_NO_IBSS; 844 if (rd_flags & NL80211_RRF_DFS) 845 channel_flags |= IEEE80211_CHAN_RADAR; 846 return channel_flags; 847 } 848 849 static int freq_reg_info_regd(struct wiphy *wiphy, 850 u32 center_freq, 851 u32 *bandwidth, 852 const struct ieee80211_reg_rule **reg_rule, 853 const struct ieee80211_regdomain *custom_regd) 854 { 855 int i; 856 bool band_rule_found = false; 857 const struct ieee80211_regdomain *regd; 858 u32 max_bandwidth = 0; 859 860 regd = custom_regd ? custom_regd : cfg80211_regdomain; 861 862 /* 863 * Follow the driver's regulatory domain, if present, unless a country 864 * IE has been processed or a user wants to help complaince further 865 */ 866 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && 867 last_request->initiator != NL80211_REGDOM_SET_BY_USER && 868 wiphy->regd) 869 regd = wiphy->regd; 870 871 if (!regd) 872 return -EINVAL; 873 874 for (i = 0; i < regd->n_reg_rules; i++) { 875 const struct ieee80211_reg_rule *rr; 876 const struct ieee80211_freq_range *fr = NULL; 877 const struct ieee80211_power_rule *pr = NULL; 878 879 rr = ®d->reg_rules[i]; 880 fr = &rr->freq_range; 881 pr = &rr->power_rule; 882 883 /* 884 * We only need to know if one frequency rule was 885 * was in center_freq's band, that's enough, so lets 886 * not overwrite it once found 887 */ 888 if (!band_rule_found) 889 band_rule_found = freq_in_rule_band(fr, center_freq); 890 891 max_bandwidth = freq_max_bandwidth(fr, center_freq); 892 893 if (max_bandwidth && *bandwidth <= max_bandwidth) { 894 *reg_rule = rr; 895 *bandwidth = max_bandwidth; 896 break; 897 } 898 } 899 900 if (!band_rule_found) 901 return -ERANGE; 902 903 return !max_bandwidth; 904 } 905 EXPORT_SYMBOL(freq_reg_info); 906 907 int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth, 908 const struct ieee80211_reg_rule **reg_rule) 909 { 910 assert_cfg80211_lock(); 911 return freq_reg_info_regd(wiphy, center_freq, 912 bandwidth, reg_rule, NULL); 913 } 914 915 static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, 916 unsigned int chan_idx) 917 { 918 int r; 919 u32 flags; 920 u32 max_bandwidth = 0; 921 const struct ieee80211_reg_rule *reg_rule = NULL; 922 const struct ieee80211_power_rule *power_rule = NULL; 923 struct ieee80211_supported_band *sband; 924 struct ieee80211_channel *chan; 925 struct wiphy *request_wiphy = NULL; 926 927 assert_cfg80211_lock(); 928 929 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 930 931 sband = wiphy->bands[band]; 932 BUG_ON(chan_idx >= sband->n_channels); 933 chan = &sband->channels[chan_idx]; 934 935 flags = chan->orig_flags; 936 937 r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq), 938 &max_bandwidth, ®_rule); 939 940 if (r) { 941 /* 942 * This means no regulatory rule was found in the country IE 943 * with a frequency range on the center_freq's band, since 944 * IEEE-802.11 allows for a country IE to have a subset of the 945 * regulatory information provided in a country we ignore 946 * disabling the channel unless at least one reg rule was 947 * found on the center_freq's band. For details see this 948 * clarification: 949 * 950 * http://tinyurl.com/11d-clarification 951 */ 952 if (r == -ERANGE && 953 last_request->initiator == 954 NL80211_REGDOM_SET_BY_COUNTRY_IE) { 955 #ifdef CONFIG_CFG80211_REG_DEBUG 956 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " 957 "intact on %s - no rule found in band on " 958 "Country IE\n", 959 chan->center_freq, wiphy_name(wiphy)); 960 #endif 961 } else { 962 /* 963 * In this case we know the country IE has at least one reg rule 964 * for the band so we respect its band definitions 965 */ 966 #ifdef CONFIG_CFG80211_REG_DEBUG 967 if (last_request->initiator == 968 NL80211_REGDOM_SET_BY_COUNTRY_IE) 969 printk(KERN_DEBUG "cfg80211: Disabling " 970 "channel %d MHz on %s due to " 971 "Country IE\n", 972 chan->center_freq, wiphy_name(wiphy)); 973 #endif 974 flags |= IEEE80211_CHAN_DISABLED; 975 chan->flags = flags; 976 } 977 return; 978 } 979 980 power_rule = ®_rule->power_rule; 981 982 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && 983 request_wiphy && request_wiphy == wiphy && 984 request_wiphy->strict_regulatory) { 985 /* 986 * This gaurantees the driver's requested regulatory domain 987 * will always be used as a base for further regulatory 988 * settings 989 */ 990 chan->flags = chan->orig_flags = 991 map_regdom_flags(reg_rule->flags); 992 chan->max_antenna_gain = chan->orig_mag = 993 (int) MBI_TO_DBI(power_rule->max_antenna_gain); 994 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); 995 chan->max_power = chan->orig_mpwr = 996 (int) MBM_TO_DBM(power_rule->max_eirp); 997 return; 998 } 999 1000 chan->flags = flags | map_regdom_flags(reg_rule->flags); 1001 chan->max_antenna_gain = min(chan->orig_mag, 1002 (int) MBI_TO_DBI(power_rule->max_antenna_gain)); 1003 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); 1004 if (chan->orig_mpwr) 1005 chan->max_power = min(chan->orig_mpwr, 1006 (int) MBM_TO_DBM(power_rule->max_eirp)); 1007 else 1008 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); 1009 } 1010 1011 static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) 1012 { 1013 unsigned int i; 1014 struct ieee80211_supported_band *sband; 1015 1016 BUG_ON(!wiphy->bands[band]); 1017 sband = wiphy->bands[band]; 1018 1019 for (i = 0; i < sband->n_channels; i++) 1020 handle_channel(wiphy, band, i); 1021 } 1022 1023 static bool ignore_reg_update(struct wiphy *wiphy, 1024 enum nl80211_reg_initiator initiator) 1025 { 1026 if (!last_request) 1027 return true; 1028 if (initiator == NL80211_REGDOM_SET_BY_CORE && 1029 wiphy->custom_regulatory) 1030 return true; 1031 /* 1032 * wiphy->regd will be set once the device has its own 1033 * desired regulatory domain set 1034 */ 1035 if (wiphy->strict_regulatory && !wiphy->regd && 1036 !is_world_regdom(last_request->alpha2)) 1037 return true; 1038 return false; 1039 } 1040 1041 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) 1042 { 1043 struct cfg80211_registered_device *drv; 1044 1045 list_for_each_entry(drv, &cfg80211_drv_list, list) 1046 wiphy_update_regulatory(&drv->wiphy, initiator); 1047 } 1048 1049 static void handle_reg_beacon(struct wiphy *wiphy, 1050 unsigned int chan_idx, 1051 struct reg_beacon *reg_beacon) 1052 { 1053 #ifdef CONFIG_CFG80211_REG_DEBUG 1054 #define REG_DEBUG_BEACON_FLAG(desc) \ 1055 printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \ 1056 "frequency: %d MHz (Ch %d) on %s\n", \ 1057 reg_beacon->chan.center_freq, \ 1058 ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \ 1059 wiphy_name(wiphy)); 1060 #else 1061 #define REG_DEBUG_BEACON_FLAG(desc) do {} while (0) 1062 #endif 1063 struct ieee80211_supported_band *sband; 1064 struct ieee80211_channel *chan; 1065 1066 assert_cfg80211_lock(); 1067 1068 sband = wiphy->bands[reg_beacon->chan.band]; 1069 chan = &sband->channels[chan_idx]; 1070 1071 if (likely(chan->center_freq != reg_beacon->chan.center_freq)) 1072 return; 1073 1074 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { 1075 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; 1076 REG_DEBUG_BEACON_FLAG("active scanning"); 1077 } 1078 1079 if (chan->flags & IEEE80211_CHAN_NO_IBSS) { 1080 chan->flags &= ~IEEE80211_CHAN_NO_IBSS; 1081 REG_DEBUG_BEACON_FLAG("beaconing"); 1082 } 1083 1084 chan->beacon_found = true; 1085 #undef REG_DEBUG_BEACON_FLAG 1086 } 1087 1088 /* 1089 * Called when a scan on a wiphy finds a beacon on 1090 * new channel 1091 */ 1092 static void wiphy_update_new_beacon(struct wiphy *wiphy, 1093 struct reg_beacon *reg_beacon) 1094 { 1095 unsigned int i; 1096 struct ieee80211_supported_band *sband; 1097 1098 assert_cfg80211_lock(); 1099 1100 if (!wiphy->bands[reg_beacon->chan.band]) 1101 return; 1102 1103 sband = wiphy->bands[reg_beacon->chan.band]; 1104 1105 for (i = 0; i < sband->n_channels; i++) 1106 handle_reg_beacon(wiphy, i, reg_beacon); 1107 } 1108 1109 /* 1110 * Called upon reg changes or a new wiphy is added 1111 */ 1112 static void wiphy_update_beacon_reg(struct wiphy *wiphy) 1113 { 1114 unsigned int i; 1115 struct ieee80211_supported_band *sband; 1116 struct reg_beacon *reg_beacon; 1117 1118 assert_cfg80211_lock(); 1119 1120 if (list_empty(®_beacon_list)) 1121 return; 1122 1123 list_for_each_entry(reg_beacon, ®_beacon_list, list) { 1124 if (!wiphy->bands[reg_beacon->chan.band]) 1125 continue; 1126 sband = wiphy->bands[reg_beacon->chan.band]; 1127 for (i = 0; i < sband->n_channels; i++) 1128 handle_reg_beacon(wiphy, i, reg_beacon); 1129 } 1130 } 1131 1132 static bool reg_is_world_roaming(struct wiphy *wiphy) 1133 { 1134 if (is_world_regdom(cfg80211_regdomain->alpha2) || 1135 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) 1136 return true; 1137 if (last_request && 1138 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && 1139 wiphy->custom_regulatory) 1140 return true; 1141 return false; 1142 } 1143 1144 /* Reap the advantages of previously found beacons */ 1145 static void reg_process_beacons(struct wiphy *wiphy) 1146 { 1147 /* 1148 * Means we are just firing up cfg80211, so no beacons would 1149 * have been processed yet. 1150 */ 1151 if (!last_request) 1152 return; 1153 if (!reg_is_world_roaming(wiphy)) 1154 return; 1155 wiphy_update_beacon_reg(wiphy); 1156 } 1157 1158 void wiphy_update_regulatory(struct wiphy *wiphy, 1159 enum nl80211_reg_initiator initiator) 1160 { 1161 enum ieee80211_band band; 1162 1163 if (ignore_reg_update(wiphy, initiator)) 1164 goto out; 1165 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1166 if (wiphy->bands[band]) 1167 handle_band(wiphy, band); 1168 } 1169 out: 1170 reg_process_beacons(wiphy); 1171 if (wiphy->reg_notifier) 1172 wiphy->reg_notifier(wiphy, last_request); 1173 } 1174 1175 static void handle_channel_custom(struct wiphy *wiphy, 1176 enum ieee80211_band band, 1177 unsigned int chan_idx, 1178 const struct ieee80211_regdomain *regd) 1179 { 1180 int r; 1181 u32 max_bandwidth = 0; 1182 const struct ieee80211_reg_rule *reg_rule = NULL; 1183 const struct ieee80211_power_rule *power_rule = NULL; 1184 struct ieee80211_supported_band *sband; 1185 struct ieee80211_channel *chan; 1186 1187 assert_cfg80211_lock(); 1188 1189 sband = wiphy->bands[band]; 1190 BUG_ON(chan_idx >= sband->n_channels); 1191 chan = &sband->channels[chan_idx]; 1192 1193 r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq), 1194 &max_bandwidth, ®_rule, regd); 1195 1196 if (r) { 1197 chan->flags = IEEE80211_CHAN_DISABLED; 1198 return; 1199 } 1200 1201 power_rule = ®_rule->power_rule; 1202 1203 chan->flags |= map_regdom_flags(reg_rule->flags); 1204 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); 1205 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); 1206 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); 1207 } 1208 1209 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, 1210 const struct ieee80211_regdomain *regd) 1211 { 1212 unsigned int i; 1213 struct ieee80211_supported_band *sband; 1214 1215 BUG_ON(!wiphy->bands[band]); 1216 sband = wiphy->bands[band]; 1217 1218 for (i = 0; i < sband->n_channels; i++) 1219 handle_channel_custom(wiphy, band, i, regd); 1220 } 1221 1222 /* Used by drivers prior to wiphy registration */ 1223 void wiphy_apply_custom_regulatory(struct wiphy *wiphy, 1224 const struct ieee80211_regdomain *regd) 1225 { 1226 enum ieee80211_band band; 1227 1228 mutex_lock(&cfg80211_mutex); 1229 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1230 if (wiphy->bands[band]) 1231 handle_band_custom(wiphy, band, regd); 1232 } 1233 mutex_unlock(&cfg80211_mutex); 1234 } 1235 EXPORT_SYMBOL(wiphy_apply_custom_regulatory); 1236 1237 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, 1238 const struct ieee80211_regdomain *src_regd) 1239 { 1240 struct ieee80211_regdomain *regd; 1241 int size_of_regd = 0; 1242 unsigned int i; 1243 1244 size_of_regd = sizeof(struct ieee80211_regdomain) + 1245 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); 1246 1247 regd = kzalloc(size_of_regd, GFP_KERNEL); 1248 if (!regd) 1249 return -ENOMEM; 1250 1251 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); 1252 1253 for (i = 0; i < src_regd->n_reg_rules; i++) 1254 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], 1255 sizeof(struct ieee80211_reg_rule)); 1256 1257 *dst_regd = regd; 1258 return 0; 1259 } 1260 1261 /* 1262 * Return value which can be used by ignore_request() to indicate 1263 * it has been determined we should intersect two regulatory domains 1264 */ 1265 #define REG_INTERSECT 1 1266 1267 /* This has the logic which determines when a new request 1268 * should be ignored. */ 1269 static int ignore_request(struct wiphy *wiphy, 1270 struct regulatory_request *pending_request) 1271 { 1272 struct wiphy *last_wiphy = NULL; 1273 1274 assert_cfg80211_lock(); 1275 1276 /* All initial requests are respected */ 1277 if (!last_request) 1278 return 0; 1279 1280 switch (pending_request->initiator) { 1281 case NL80211_REGDOM_SET_BY_CORE: 1282 return -EINVAL; 1283 case NL80211_REGDOM_SET_BY_COUNTRY_IE: 1284 1285 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 1286 1287 if (unlikely(!is_an_alpha2(pending_request->alpha2))) 1288 return -EINVAL; 1289 if (last_request->initiator == 1290 NL80211_REGDOM_SET_BY_COUNTRY_IE) { 1291 if (last_wiphy != wiphy) { 1292 /* 1293 * Two cards with two APs claiming different 1294 * different Country IE alpha2s. We could 1295 * intersect them, but that seems unlikely 1296 * to be correct. Reject second one for now. 1297 */ 1298 if (regdom_changes(pending_request->alpha2)) 1299 return -EOPNOTSUPP; 1300 return -EALREADY; 1301 } 1302 /* 1303 * Two consecutive Country IE hints on the same wiphy. 1304 * This should be picked up early by the driver/stack 1305 */ 1306 if (WARN_ON(regdom_changes(pending_request->alpha2))) 1307 return 0; 1308 return -EALREADY; 1309 } 1310 return REG_INTERSECT; 1311 case NL80211_REGDOM_SET_BY_DRIVER: 1312 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { 1313 if (is_old_static_regdom(cfg80211_regdomain)) 1314 return 0; 1315 if (regdom_changes(pending_request->alpha2)) 1316 return 0; 1317 return -EALREADY; 1318 } 1319 1320 /* 1321 * This would happen if you unplug and plug your card 1322 * back in or if you add a new device for which the previously 1323 * loaded card also agrees on the regulatory domain. 1324 */ 1325 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && 1326 !regdom_changes(pending_request->alpha2)) 1327 return -EALREADY; 1328 1329 return REG_INTERSECT; 1330 case NL80211_REGDOM_SET_BY_USER: 1331 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) 1332 return REG_INTERSECT; 1333 /* 1334 * If the user knows better the user should set the regdom 1335 * to their country before the IE is picked up 1336 */ 1337 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && 1338 last_request->intersect) 1339 return -EOPNOTSUPP; 1340 /* 1341 * Process user requests only after previous user/driver/core 1342 * requests have been processed 1343 */ 1344 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || 1345 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || 1346 last_request->initiator == NL80211_REGDOM_SET_BY_USER) { 1347 if (regdom_changes(last_request->alpha2)) 1348 return -EAGAIN; 1349 } 1350 1351 if (!is_old_static_regdom(cfg80211_regdomain) && 1352 !regdom_changes(pending_request->alpha2)) 1353 return -EALREADY; 1354 1355 return 0; 1356 } 1357 1358 return -EINVAL; 1359 } 1360 1361 /** 1362 * __regulatory_hint - hint to the wireless core a regulatory domain 1363 * @wiphy: if the hint comes from country information from an AP, this 1364 * is required to be set to the wiphy that received the information 1365 * @pending_request: the regulatory request currently being processed 1366 * 1367 * The Wireless subsystem can use this function to hint to the wireless core 1368 * what it believes should be the current regulatory domain. 1369 * 1370 * Returns zero if all went fine, %-EALREADY if a regulatory domain had 1371 * already been set or other standard error codes. 1372 * 1373 * Caller must hold &cfg80211_mutex 1374 */ 1375 static int __regulatory_hint(struct wiphy *wiphy, 1376 struct regulatory_request *pending_request) 1377 { 1378 bool intersect = false; 1379 int r = 0; 1380 1381 assert_cfg80211_lock(); 1382 1383 r = ignore_request(wiphy, pending_request); 1384 1385 if (r == REG_INTERSECT) { 1386 if (pending_request->initiator == 1387 NL80211_REGDOM_SET_BY_DRIVER) { 1388 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); 1389 if (r) { 1390 kfree(pending_request); 1391 return r; 1392 } 1393 } 1394 intersect = true; 1395 } else if (r) { 1396 /* 1397 * If the regulatory domain being requested by the 1398 * driver has already been set just copy it to the 1399 * wiphy 1400 */ 1401 if (r == -EALREADY && 1402 pending_request->initiator == 1403 NL80211_REGDOM_SET_BY_DRIVER) { 1404 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); 1405 if (r) { 1406 kfree(pending_request); 1407 return r; 1408 } 1409 r = -EALREADY; 1410 goto new_request; 1411 } 1412 kfree(pending_request); 1413 return r; 1414 } 1415 1416 new_request: 1417 kfree(last_request); 1418 1419 last_request = pending_request; 1420 last_request->intersect = intersect; 1421 1422 pending_request = NULL; 1423 1424 /* When r == REG_INTERSECT we do need to call CRDA */ 1425 if (r < 0) { 1426 /* 1427 * Since CRDA will not be called in this case as we already 1428 * have applied the requested regulatory domain before we just 1429 * inform userspace we have processed the request 1430 */ 1431 if (r == -EALREADY) 1432 nl80211_send_reg_change_event(last_request); 1433 return r; 1434 } 1435 1436 return call_crda(last_request->alpha2); 1437 } 1438 1439 /* This processes *all* regulatory hints */ 1440 static void reg_process_hint(struct regulatory_request *reg_request) 1441 { 1442 int r = 0; 1443 struct wiphy *wiphy = NULL; 1444 1445 BUG_ON(!reg_request->alpha2); 1446 1447 mutex_lock(&cfg80211_mutex); 1448 1449 if (wiphy_idx_valid(reg_request->wiphy_idx)) 1450 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); 1451 1452 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && 1453 !wiphy) { 1454 kfree(reg_request); 1455 goto out; 1456 } 1457 1458 r = __regulatory_hint(wiphy, reg_request); 1459 /* This is required so that the orig_* parameters are saved */ 1460 if (r == -EALREADY && wiphy && wiphy->strict_regulatory) 1461 wiphy_update_regulatory(wiphy, reg_request->initiator); 1462 out: 1463 mutex_unlock(&cfg80211_mutex); 1464 } 1465 1466 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */ 1467 static void reg_process_pending_hints(void) 1468 { 1469 struct regulatory_request *reg_request; 1470 1471 spin_lock(®_requests_lock); 1472 while (!list_empty(®_requests_list)) { 1473 reg_request = list_first_entry(®_requests_list, 1474 struct regulatory_request, 1475 list); 1476 list_del_init(®_request->list); 1477 1478 spin_unlock(®_requests_lock); 1479 reg_process_hint(reg_request); 1480 spin_lock(®_requests_lock); 1481 } 1482 spin_unlock(®_requests_lock); 1483 } 1484 1485 /* Processes beacon hints -- this has nothing to do with country IEs */ 1486 static void reg_process_pending_beacon_hints(void) 1487 { 1488 struct cfg80211_registered_device *drv; 1489 struct reg_beacon *pending_beacon, *tmp; 1490 1491 mutex_lock(&cfg80211_mutex); 1492 1493 /* This goes through the _pending_ beacon list */ 1494 spin_lock_bh(®_pending_beacons_lock); 1495 1496 if (list_empty(®_pending_beacons)) { 1497 spin_unlock_bh(®_pending_beacons_lock); 1498 goto out; 1499 } 1500 1501 list_for_each_entry_safe(pending_beacon, tmp, 1502 ®_pending_beacons, list) { 1503 1504 list_del_init(&pending_beacon->list); 1505 1506 /* Applies the beacon hint to current wiphys */ 1507 list_for_each_entry(drv, &cfg80211_drv_list, list) 1508 wiphy_update_new_beacon(&drv->wiphy, pending_beacon); 1509 1510 /* Remembers the beacon hint for new wiphys or reg changes */ 1511 list_add_tail(&pending_beacon->list, ®_beacon_list); 1512 } 1513 1514 spin_unlock_bh(®_pending_beacons_lock); 1515 out: 1516 mutex_unlock(&cfg80211_mutex); 1517 } 1518 1519 static void reg_todo(struct work_struct *work) 1520 { 1521 reg_process_pending_hints(); 1522 reg_process_pending_beacon_hints(); 1523 } 1524 1525 static DECLARE_WORK(reg_work, reg_todo); 1526 1527 static void queue_regulatory_request(struct regulatory_request *request) 1528 { 1529 spin_lock(®_requests_lock); 1530 list_add_tail(&request->list, ®_requests_list); 1531 spin_unlock(®_requests_lock); 1532 1533 schedule_work(®_work); 1534 } 1535 1536 /* Core regulatory hint -- happens once during cfg80211_init() */ 1537 static int regulatory_hint_core(const char *alpha2) 1538 { 1539 struct regulatory_request *request; 1540 1541 BUG_ON(last_request); 1542 1543 request = kzalloc(sizeof(struct regulatory_request), 1544 GFP_KERNEL); 1545 if (!request) 1546 return -ENOMEM; 1547 1548 request->alpha2[0] = alpha2[0]; 1549 request->alpha2[1] = alpha2[1]; 1550 request->initiator = NL80211_REGDOM_SET_BY_CORE; 1551 1552 queue_regulatory_request(request); 1553 1554 return 0; 1555 } 1556 1557 /* User hints */ 1558 int regulatory_hint_user(const char *alpha2) 1559 { 1560 struct regulatory_request *request; 1561 1562 BUG_ON(!alpha2); 1563 1564 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); 1565 if (!request) 1566 return -ENOMEM; 1567 1568 request->wiphy_idx = WIPHY_IDX_STALE; 1569 request->alpha2[0] = alpha2[0]; 1570 request->alpha2[1] = alpha2[1]; 1571 request->initiator = NL80211_REGDOM_SET_BY_USER, 1572 1573 queue_regulatory_request(request); 1574 1575 return 0; 1576 } 1577 1578 /* Driver hints */ 1579 int regulatory_hint(struct wiphy *wiphy, const char *alpha2) 1580 { 1581 struct regulatory_request *request; 1582 1583 BUG_ON(!alpha2); 1584 BUG_ON(!wiphy); 1585 1586 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); 1587 if (!request) 1588 return -ENOMEM; 1589 1590 request->wiphy_idx = get_wiphy_idx(wiphy); 1591 1592 /* Must have registered wiphy first */ 1593 BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); 1594 1595 request->alpha2[0] = alpha2[0]; 1596 request->alpha2[1] = alpha2[1]; 1597 request->initiator = NL80211_REGDOM_SET_BY_DRIVER; 1598 1599 queue_regulatory_request(request); 1600 1601 return 0; 1602 } 1603 EXPORT_SYMBOL(regulatory_hint); 1604 1605 static bool reg_same_country_ie_hint(struct wiphy *wiphy, 1606 u32 country_ie_checksum) 1607 { 1608 struct wiphy *request_wiphy; 1609 1610 assert_cfg80211_lock(); 1611 1612 if (unlikely(last_request->initiator != 1613 NL80211_REGDOM_SET_BY_COUNTRY_IE)) 1614 return false; 1615 1616 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 1617 1618 if (!request_wiphy) 1619 return false; 1620 1621 if (likely(request_wiphy != wiphy)) 1622 return !country_ie_integrity_changes(country_ie_checksum); 1623 /* 1624 * We should not have let these through at this point, they 1625 * should have been picked up earlier by the first alpha2 check 1626 * on the device 1627 */ 1628 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) 1629 return true; 1630 return false; 1631 } 1632 1633 void regulatory_hint_11d(struct wiphy *wiphy, 1634 u8 *country_ie, 1635 u8 country_ie_len) 1636 { 1637 struct ieee80211_regdomain *rd = NULL; 1638 char alpha2[2]; 1639 u32 checksum = 0; 1640 enum environment_cap env = ENVIRON_ANY; 1641 struct regulatory_request *request; 1642 1643 mutex_lock(&cfg80211_mutex); 1644 1645 if (unlikely(!last_request)) { 1646 mutex_unlock(&cfg80211_mutex); 1647 return; 1648 } 1649 1650 /* IE len must be evenly divisible by 2 */ 1651 if (country_ie_len & 0x01) 1652 goto out; 1653 1654 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1655 goto out; 1656 1657 /* 1658 * Pending country IE processing, this can happen after we 1659 * call CRDA and wait for a response if a beacon was received before 1660 * we were able to process the last regulatory_hint_11d() call 1661 */ 1662 if (country_ie_regdomain) 1663 goto out; 1664 1665 alpha2[0] = country_ie[0]; 1666 alpha2[1] = country_ie[1]; 1667 1668 if (country_ie[2] == 'I') 1669 env = ENVIRON_INDOOR; 1670 else if (country_ie[2] == 'O') 1671 env = ENVIRON_OUTDOOR; 1672 1673 /* 1674 * We will run this for *every* beacon processed for the BSSID, so 1675 * we optimize an early check to exit out early if we don't have to 1676 * do anything 1677 */ 1678 if (likely(last_request->initiator == 1679 NL80211_REGDOM_SET_BY_COUNTRY_IE && 1680 wiphy_idx_valid(last_request->wiphy_idx))) { 1681 struct cfg80211_registered_device *drv_last_ie; 1682 1683 drv_last_ie = 1684 cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx); 1685 1686 /* 1687 * Lets keep this simple -- we trust the first AP 1688 * after we intersect with CRDA 1689 */ 1690 if (likely(&drv_last_ie->wiphy == wiphy)) { 1691 /* 1692 * Ignore IEs coming in on this wiphy with 1693 * the same alpha2 and environment cap 1694 */ 1695 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, 1696 alpha2) && 1697 env == drv_last_ie->env)) { 1698 goto out; 1699 } 1700 /* 1701 * the wiphy moved on to another BSSID or the AP 1702 * was reconfigured. XXX: We need to deal with the 1703 * case where the user suspends and goes to goes 1704 * to another country, and then gets IEs from an 1705 * AP with different settings 1706 */ 1707 goto out; 1708 } else { 1709 /* 1710 * Ignore IEs coming in on two separate wiphys with 1711 * the same alpha2 and environment cap 1712 */ 1713 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, 1714 alpha2) && 1715 env == drv_last_ie->env)) { 1716 goto out; 1717 } 1718 /* We could potentially intersect though */ 1719 goto out; 1720 } 1721 } 1722 1723 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); 1724 if (!rd) 1725 goto out; 1726 1727 /* 1728 * This will not happen right now but we leave it here for the 1729 * the future when we want to add suspend/resume support and having 1730 * the user move to another country after doing so, or having the user 1731 * move to another AP. Right now we just trust the first AP. 1732 * 1733 * If we hit this before we add this support we want to be informed of 1734 * it as it would indicate a mistake in the current design 1735 */ 1736 if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum))) 1737 goto free_rd_out; 1738 1739 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); 1740 if (!request) 1741 goto free_rd_out; 1742 1743 /* 1744 * We keep this around for when CRDA comes back with a response so 1745 * we can intersect with that 1746 */ 1747 country_ie_regdomain = rd; 1748 1749 request->wiphy_idx = get_wiphy_idx(wiphy); 1750 request->alpha2[0] = rd->alpha2[0]; 1751 request->alpha2[1] = rd->alpha2[1]; 1752 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; 1753 request->country_ie_checksum = checksum; 1754 request->country_ie_env = env; 1755 1756 mutex_unlock(&cfg80211_mutex); 1757 1758 queue_regulatory_request(request); 1759 1760 return; 1761 1762 free_rd_out: 1763 kfree(rd); 1764 out: 1765 mutex_unlock(&cfg80211_mutex); 1766 } 1767 EXPORT_SYMBOL(regulatory_hint_11d); 1768 1769 static bool freq_is_chan_12_13_14(u16 freq) 1770 { 1771 if (freq == ieee80211_channel_to_frequency(12) || 1772 freq == ieee80211_channel_to_frequency(13) || 1773 freq == ieee80211_channel_to_frequency(14)) 1774 return true; 1775 return false; 1776 } 1777 1778 int regulatory_hint_found_beacon(struct wiphy *wiphy, 1779 struct ieee80211_channel *beacon_chan, 1780 gfp_t gfp) 1781 { 1782 struct reg_beacon *reg_beacon; 1783 1784 if (likely((beacon_chan->beacon_found || 1785 (beacon_chan->flags & IEEE80211_CHAN_RADAR) || 1786 (beacon_chan->band == IEEE80211_BAND_2GHZ && 1787 !freq_is_chan_12_13_14(beacon_chan->center_freq))))) 1788 return 0; 1789 1790 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); 1791 if (!reg_beacon) 1792 return -ENOMEM; 1793 1794 #ifdef CONFIG_CFG80211_REG_DEBUG 1795 printk(KERN_DEBUG "cfg80211: Found new beacon on " 1796 "frequency: %d MHz (Ch %d) on %s\n", 1797 beacon_chan->center_freq, 1798 ieee80211_frequency_to_channel(beacon_chan->center_freq), 1799 wiphy_name(wiphy)); 1800 #endif 1801 memcpy(®_beacon->chan, beacon_chan, 1802 sizeof(struct ieee80211_channel)); 1803 1804 1805 /* 1806 * Since we can be called from BH or and non-BH context 1807 * we must use spin_lock_bh() 1808 */ 1809 spin_lock_bh(®_pending_beacons_lock); 1810 list_add_tail(®_beacon->list, ®_pending_beacons); 1811 spin_unlock_bh(®_pending_beacons_lock); 1812 1813 schedule_work(®_work); 1814 1815 return 0; 1816 } 1817 1818 static void print_rd_rules(const struct ieee80211_regdomain *rd) 1819 { 1820 unsigned int i; 1821 const struct ieee80211_reg_rule *reg_rule = NULL; 1822 const struct ieee80211_freq_range *freq_range = NULL; 1823 const struct ieee80211_power_rule *power_rule = NULL; 1824 1825 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " 1826 "(max_antenna_gain, max_eirp)\n"); 1827 1828 for (i = 0; i < rd->n_reg_rules; i++) { 1829 reg_rule = &rd->reg_rules[i]; 1830 freq_range = ®_rule->freq_range; 1831 power_rule = ®_rule->power_rule; 1832 1833 /* 1834 * There may not be documentation for max antenna gain 1835 * in certain regions 1836 */ 1837 if (power_rule->max_antenna_gain) 1838 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " 1839 "(%d mBi, %d mBm)\n", 1840 freq_range->start_freq_khz, 1841 freq_range->end_freq_khz, 1842 freq_range->max_bandwidth_khz, 1843 power_rule->max_antenna_gain, 1844 power_rule->max_eirp); 1845 else 1846 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " 1847 "(N/A, %d mBm)\n", 1848 freq_range->start_freq_khz, 1849 freq_range->end_freq_khz, 1850 freq_range->max_bandwidth_khz, 1851 power_rule->max_eirp); 1852 } 1853 } 1854 1855 static void print_regdomain(const struct ieee80211_regdomain *rd) 1856 { 1857 1858 if (is_intersected_alpha2(rd->alpha2)) { 1859 1860 if (last_request->initiator == 1861 NL80211_REGDOM_SET_BY_COUNTRY_IE) { 1862 struct cfg80211_registered_device *drv; 1863 drv = cfg80211_drv_by_wiphy_idx( 1864 last_request->wiphy_idx); 1865 if (drv) { 1866 printk(KERN_INFO "cfg80211: Current regulatory " 1867 "domain updated by AP to: %c%c\n", 1868 drv->country_ie_alpha2[0], 1869 drv->country_ie_alpha2[1]); 1870 } else 1871 printk(KERN_INFO "cfg80211: Current regulatory " 1872 "domain intersected: \n"); 1873 } else 1874 printk(KERN_INFO "cfg80211: Current regulatory " 1875 "domain intersected: \n"); 1876 } else if (is_world_regdom(rd->alpha2)) 1877 printk(KERN_INFO "cfg80211: World regulatory " 1878 "domain updated:\n"); 1879 else { 1880 if (is_unknown_alpha2(rd->alpha2)) 1881 printk(KERN_INFO "cfg80211: Regulatory domain " 1882 "changed to driver built-in settings " 1883 "(unknown country)\n"); 1884 else 1885 printk(KERN_INFO "cfg80211: Regulatory domain " 1886 "changed to country: %c%c\n", 1887 rd->alpha2[0], rd->alpha2[1]); 1888 } 1889 print_rd_rules(rd); 1890 } 1891 1892 static void print_regdomain_info(const struct ieee80211_regdomain *rd) 1893 { 1894 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", 1895 rd->alpha2[0], rd->alpha2[1]); 1896 print_rd_rules(rd); 1897 } 1898 1899 #ifdef CONFIG_CFG80211_REG_DEBUG 1900 static void reg_country_ie_process_debug( 1901 const struct ieee80211_regdomain *rd, 1902 const struct ieee80211_regdomain *country_ie_regdomain, 1903 const struct ieee80211_regdomain *intersected_rd) 1904 { 1905 printk(KERN_DEBUG "cfg80211: Received country IE:\n"); 1906 print_regdomain_info(country_ie_regdomain); 1907 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); 1908 print_regdomain_info(rd); 1909 if (intersected_rd) { 1910 printk(KERN_DEBUG "cfg80211: We intersect both of these " 1911 "and get:\n"); 1912 print_regdomain_info(intersected_rd); 1913 return; 1914 } 1915 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); 1916 } 1917 #else 1918 static inline void reg_country_ie_process_debug( 1919 const struct ieee80211_regdomain *rd, 1920 const struct ieee80211_regdomain *country_ie_regdomain, 1921 const struct ieee80211_regdomain *intersected_rd) 1922 { 1923 } 1924 #endif 1925 1926 /* Takes ownership of rd only if it doesn't fail */ 1927 static int __set_regdom(const struct ieee80211_regdomain *rd) 1928 { 1929 const struct ieee80211_regdomain *intersected_rd = NULL; 1930 struct cfg80211_registered_device *drv = NULL; 1931 struct wiphy *request_wiphy; 1932 /* Some basic sanity checks first */ 1933 1934 if (is_world_regdom(rd->alpha2)) { 1935 if (WARN_ON(!reg_is_valid_request(rd->alpha2))) 1936 return -EINVAL; 1937 update_world_regdomain(rd); 1938 return 0; 1939 } 1940 1941 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && 1942 !is_unknown_alpha2(rd->alpha2)) 1943 return -EINVAL; 1944 1945 if (!last_request) 1946 return -EINVAL; 1947 1948 /* 1949 * Lets only bother proceeding on the same alpha2 if the current 1950 * rd is non static (it means CRDA was present and was used last) 1951 * and the pending request came in from a country IE 1952 */ 1953 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { 1954 /* 1955 * If someone else asked us to change the rd lets only bother 1956 * checking if the alpha2 changes if CRDA was already called 1957 */ 1958 if (!is_old_static_regdom(cfg80211_regdomain) && 1959 !regdom_changes(rd->alpha2)) 1960 return -EINVAL; 1961 } 1962 1963 /* 1964 * Now lets set the regulatory domain, update all driver channels 1965 * and finally inform them of what we have done, in case they want 1966 * to review or adjust their own settings based on their own 1967 * internal EEPROM data 1968 */ 1969 1970 if (WARN_ON(!reg_is_valid_request(rd->alpha2))) 1971 return -EINVAL; 1972 1973 if (!is_valid_rd(rd)) { 1974 printk(KERN_ERR "cfg80211: Invalid " 1975 "regulatory domain detected:\n"); 1976 print_regdomain_info(rd); 1977 return -EINVAL; 1978 } 1979 1980 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 1981 1982 if (!last_request->intersect) { 1983 int r; 1984 1985 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { 1986 reset_regdomains(); 1987 cfg80211_regdomain = rd; 1988 return 0; 1989 } 1990 1991 /* 1992 * For a driver hint, lets copy the regulatory domain the 1993 * driver wanted to the wiphy to deal with conflicts 1994 */ 1995 1996 BUG_ON(request_wiphy->regd); 1997 1998 r = reg_copy_regd(&request_wiphy->regd, rd); 1999 if (r) 2000 return r; 2001 2002 reset_regdomains(); 2003 cfg80211_regdomain = rd; 2004 return 0; 2005 } 2006 2007 /* Intersection requires a bit more work */ 2008 2009 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { 2010 2011 intersected_rd = regdom_intersect(rd, cfg80211_regdomain); 2012 if (!intersected_rd) 2013 return -EINVAL; 2014 2015 /* 2016 * We can trash what CRDA provided now. 2017 * However if a driver requested this specific regulatory 2018 * domain we keep it for its private use 2019 */ 2020 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) 2021 request_wiphy->regd = rd; 2022 else 2023 kfree(rd); 2024 2025 rd = NULL; 2026 2027 reset_regdomains(); 2028 cfg80211_regdomain = intersected_rd; 2029 2030 return 0; 2031 } 2032 2033 /* 2034 * Country IE requests are handled a bit differently, we intersect 2035 * the country IE rd with what CRDA believes that country should have 2036 */ 2037 2038 BUG_ON(!country_ie_regdomain); 2039 BUG_ON(rd == country_ie_regdomain); 2040 2041 /* 2042 * Intersect what CRDA returned and our what we 2043 * had built from the Country IE received 2044 */ 2045 2046 intersected_rd = regdom_intersect(rd, country_ie_regdomain); 2047 2048 reg_country_ie_process_debug(rd, 2049 country_ie_regdomain, 2050 intersected_rd); 2051 2052 kfree(country_ie_regdomain); 2053 country_ie_regdomain = NULL; 2054 2055 if (!intersected_rd) 2056 return -EINVAL; 2057 2058 drv = wiphy_to_dev(request_wiphy); 2059 2060 drv->country_ie_alpha2[0] = rd->alpha2[0]; 2061 drv->country_ie_alpha2[1] = rd->alpha2[1]; 2062 drv->env = last_request->country_ie_env; 2063 2064 BUG_ON(intersected_rd == rd); 2065 2066 kfree(rd); 2067 rd = NULL; 2068 2069 reset_regdomains(); 2070 cfg80211_regdomain = intersected_rd; 2071 2072 return 0; 2073 } 2074 2075 2076 /* 2077 * Use this call to set the current regulatory domain. Conflicts with 2078 * multiple drivers can be ironed out later. Caller must've already 2079 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex 2080 */ 2081 int set_regdom(const struct ieee80211_regdomain *rd) 2082 { 2083 int r; 2084 2085 assert_cfg80211_lock(); 2086 2087 /* Note that this doesn't update the wiphys, this is done below */ 2088 r = __set_regdom(rd); 2089 if (r) { 2090 kfree(rd); 2091 return r; 2092 } 2093 2094 /* This would make this whole thing pointless */ 2095 if (!last_request->intersect) 2096 BUG_ON(rd != cfg80211_regdomain); 2097 2098 /* update all wiphys now with the new established regulatory domain */ 2099 update_all_wiphy_regulatory(last_request->initiator); 2100 2101 print_regdomain(cfg80211_regdomain); 2102 2103 nl80211_send_reg_change_event(last_request); 2104 2105 return r; 2106 } 2107 2108 /* Caller must hold cfg80211_mutex */ 2109 void reg_device_remove(struct wiphy *wiphy) 2110 { 2111 struct wiphy *request_wiphy = NULL; 2112 2113 assert_cfg80211_lock(); 2114 2115 if (last_request) 2116 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); 2117 2118 kfree(wiphy->regd); 2119 if (!last_request || !request_wiphy) 2120 return; 2121 if (request_wiphy != wiphy) 2122 return; 2123 last_request->wiphy_idx = WIPHY_IDX_STALE; 2124 last_request->country_ie_env = ENVIRON_ANY; 2125 } 2126 2127 int regulatory_init(void) 2128 { 2129 int err = 0; 2130 2131 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); 2132 if (IS_ERR(reg_pdev)) 2133 return PTR_ERR(reg_pdev); 2134 2135 spin_lock_init(®_requests_lock); 2136 spin_lock_init(®_pending_beacons_lock); 2137 2138 #ifdef CONFIG_WIRELESS_OLD_REGULATORY 2139 cfg80211_regdomain = static_regdom(ieee80211_regdom); 2140 2141 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); 2142 print_regdomain_info(cfg80211_regdomain); 2143 /* 2144 * The old code still requests for a new regdomain and if 2145 * you have CRDA you get it updated, otherwise you get 2146 * stuck with the static values. Since "EU" is not a valid 2147 * ISO / IEC 3166 alpha2 code we can't expect userpace to 2148 * give us a regulatory domain for it. We need last_request 2149 * iniitalized though so lets just send a request which we 2150 * know will be ignored... this crap will be removed once 2151 * OLD_REG dies. 2152 */ 2153 err = regulatory_hint_core(ieee80211_regdom); 2154 #else 2155 cfg80211_regdomain = cfg80211_world_regdom; 2156 2157 err = regulatory_hint_core(ieee80211_regdom); 2158 #endif 2159 if (err) { 2160 if (err == -ENOMEM) 2161 return err; 2162 /* 2163 * N.B. kobject_uevent_env() can fail mainly for when we're out 2164 * memory which is handled and propagated appropriately above 2165 * but it can also fail during a netlink_broadcast() or during 2166 * early boot for call_usermodehelper(). For now treat these 2167 * errors as non-fatal. 2168 */ 2169 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " 2170 "to call CRDA during init"); 2171 #ifdef CONFIG_CFG80211_REG_DEBUG 2172 /* We want to find out exactly why when debugging */ 2173 WARN_ON(err); 2174 #endif 2175 } 2176 2177 return 0; 2178 } 2179 2180 void regulatory_exit(void) 2181 { 2182 struct regulatory_request *reg_request, *tmp; 2183 struct reg_beacon *reg_beacon, *btmp; 2184 2185 cancel_work_sync(®_work); 2186 2187 mutex_lock(&cfg80211_mutex); 2188 2189 reset_regdomains(); 2190 2191 kfree(country_ie_regdomain); 2192 country_ie_regdomain = NULL; 2193 2194 kfree(last_request); 2195 2196 platform_device_unregister(reg_pdev); 2197 2198 spin_lock_bh(®_pending_beacons_lock); 2199 if (!list_empty(®_pending_beacons)) { 2200 list_for_each_entry_safe(reg_beacon, btmp, 2201 ®_pending_beacons, list) { 2202 list_del(®_beacon->list); 2203 kfree(reg_beacon); 2204 } 2205 } 2206 spin_unlock_bh(®_pending_beacons_lock); 2207 2208 if (!list_empty(®_beacon_list)) { 2209 list_for_each_entry_safe(reg_beacon, btmp, 2210 ®_beacon_list, list) { 2211 list_del(®_beacon->list); 2212 kfree(reg_beacon); 2213 } 2214 } 2215 2216 spin_lock(®_requests_lock); 2217 if (!list_empty(®_requests_list)) { 2218 list_for_each_entry_safe(reg_request, tmp, 2219 ®_requests_list, list) { 2220 list_del(®_request->list); 2221 kfree(reg_request); 2222 } 2223 } 2224 spin_unlock(®_requests_lock); 2225 2226 mutex_unlock(&cfg80211_mutex); 2227 } 2228