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