net/wireless/reg.c

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