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, enum ieee80211_band band,
 727                            unsigned int chan_idx)
 728 {
 729         int r;
 730         u32 flags, bw_flags = 0;
 731         u32 desired_bw_khz = MHZ_TO_KHZ(20);
 732         const struct ieee80211_reg_rule *reg_rule = NULL;
 733         const struct ieee80211_power_rule *power_rule = NULL;
 734         const struct ieee80211_freq_range *freq_range = NULL;
 735         struct ieee80211_supported_band *sband;
 736         struct ieee80211_channel *chan;
 737         struct wiphy *request_wiphy = NULL;
 738
 739         assert_cfg80211_lock();
 740
 741         request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
 742
 743         sband = wiphy->bands[band];
 744         BUG_ON(chan_idx >= sband->n_channels);
 745         chan = &sband->channels[chan_idx];
 746
 747         flags = chan->orig_flags;
 748
 749         r = freq_reg_info(wiphy,
 750                           MHZ_TO_KHZ(chan->center_freq),
 751                           desired_bw_khz,
 752                           &reg_rule);
 753
 754         if (r)
 755                 return;
 756
 757         power_rule = &reg_rule->power_rule;
 758         freq_range = &reg_rule->freq_range;
 759
 760         if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
 761                 bw_flags = IEEE80211_CHAN_NO_HT40;
 762
 763         if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
 764             request_wiphy && request_wiphy == wiphy &&
 765             request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
 766                 /*
 767                  * This gaurantees the driver's requested regulatory domain
 768                  * will always be used as a base for further regulatory
 769                  * settings
 770                  */
 771                 chan->flags = chan->orig_flags =
 772                         map_regdom_flags(reg_rule->flags) | bw_flags;
 773                 chan->max_antenna_gain = chan->orig_mag =
 774                         (int) MBI_TO_DBI(power_rule->max_antenna_gain);
 775                 chan->max_power = chan->orig_mpwr =
 776                         (int) MBM_TO_DBM(power_rule->max_eirp);
 777                 return;
 778         }
 779
 780         chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
 781         chan->max_antenna_gain = min(chan->orig_mag,
 782                 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
 783         if (chan->orig_mpwr)
 784                 chan->max_power = min(chan->orig_mpwr,
 785                         (int) MBM_TO_DBM(power_rule->max_eirp));
 786         else
 787                 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
 788 }
 789
 790 static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
 791 {
 792         unsigned int i;
 793         struct ieee80211_supported_band *sband;
 794
 795         BUG_ON(!wiphy->bands[band]);
 796         sband = wiphy->bands[band];
 797
 798         for (i = 0; i < sband->n_channels; i++)
 799                 handle_channel(wiphy, band, i);
 800 }
 801
 802 static bool ignore_reg_update(struct wiphy *wiphy,
 803                               enum nl80211_reg_initiator initiator)
 804 {
 805         if (!last_request)
 806                 return true;
 807         if (initiator == NL80211_REGDOM_SET_BY_CORE &&
 808             wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
 809                 return true;
 810         /*
 811          * wiphy->regd will be set once the device has its own
 812          * desired regulatory domain set
 813          */
 814         if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
 815             !is_world_regdom(last_request->alpha2))
 816                 return true;
 817         return false;
 818 }
 819
 820 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
 821 {
 822         struct cfg80211_registered_device *rdev;
 823
 824         list_for_each_entry(rdev, &cfg80211_rdev_list, list)
 825                 wiphy_update_regulatory(&rdev->wiphy, initiator);
 826 }
 827
 828 static void handle_reg_beacon(struct wiphy *wiphy,
 829                               unsigned int chan_idx,
 830                               struct reg_beacon *reg_beacon)
 831 {
 832         struct ieee80211_supported_band *sband;
 833         struct ieee80211_channel *chan;
 834         bool channel_changed = false;
 835         struct ieee80211_channel chan_before;
 836
 837         assert_cfg80211_lock();
 838
 839         sband = wiphy->bands[reg_beacon->chan.band];
 840         chan = &sband->channels[chan_idx];
 841
 842         if (likely(chan->center_freq != reg_beacon->chan.center_freq))
 843                 return;
 844
 845         if (chan->beacon_found)
 846                 return;
 847
 848         chan->beacon_found = true;
 849
 850         if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
 851                 return;
 852
 853         chan_before.center_freq = chan->center_freq;
 854         chan_before.flags = chan->flags;
 855
 856         if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
 857                 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 858                 channel_changed = true;
 859         }
 860
 861         if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
 862                 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
 863                 channel_changed = true;
 864         }
 865
 866         if (channel_changed)
 867                 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
 868 }
 869
 870 /*
 871  * Called when a scan on a wiphy finds a beacon on
 872  * new channel
 873  */
 874 static void wiphy_update_new_beacon(struct wiphy *wiphy,
 875                                     struct reg_beacon *reg_beacon)
 876 {
 877         unsigned int i;
 878         struct ieee80211_supported_band *sband;
 879
 880         assert_cfg80211_lock();
 881
 882         if (!wiphy->bands[reg_beacon->chan.band])
 883                 return;
 884
 885         sband = wiphy->bands[reg_beacon->chan.band];
 886
 887         for (i = 0; i < sband->n_channels; i++)
 888                 handle_reg_beacon(wiphy, i, reg_beacon);
 889 }
 890
 891 /*
 892  * Called upon reg changes or a new wiphy is added
 893  */
 894 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
 895 {
 896         unsigned int i;
 897         struct ieee80211_supported_band *sband;
 898         struct reg_beacon *reg_beacon;
 899
 900         assert_cfg80211_lock();
 901
 902         if (list_empty(&reg_beacon_list))
 903                 return;
 904
 905         list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
 906                 if (!wiphy->bands[reg_beacon->chan.band])
 907                         continue;
 908                 sband = wiphy->bands[reg_beacon->chan.band];
 909                 for (i = 0; i < sband->n_channels; i++)
 910                         handle_reg_beacon(wiphy, i, reg_beacon);
 911         }
 912 }
 913
 914 static bool reg_is_world_roaming(struct wiphy *wiphy)
 915 {
 916         if (is_world_regdom(cfg80211_regdomain->alpha2) ||
 917             (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
 918                 return true;
 919         if (last_request &&
 920             last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
 921             wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
 922                 return true;
 923         return false;
 924 }
 925
 926 /* Reap the advantages of previously found beacons */
 927 static void reg_process_beacons(struct wiphy *wiphy)
 928 {
 929         /*
 930          * Means we are just firing up cfg80211, so no beacons would
 931          * have been processed yet.
 932          */
 933         if (!last_request)
 934                 return;
 935         if (!reg_is_world_roaming(wiphy))
 936                 return;
 937         wiphy_update_beacon_reg(wiphy);
 938 }
 939
 940 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
 941 {
 942         if (!chan)
 943                 return true;
 944         if (chan->flags & IEEE80211_CHAN_DISABLED)
 945                 return true;
 946         /* This would happen when regulatory rules disallow HT40 completely */
 947         if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
 948                 return true;
 949         return false;
 950 }
 951
 952 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
 953                                          enum ieee80211_band band,
 954                                          unsigned int chan_idx)
 955 {
 956         struct ieee80211_supported_band *sband;
 957         struct ieee80211_channel *channel;
 958         struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
 959         unsigned int i;
 960
 961         assert_cfg80211_lock();
 962
 963         sband = wiphy->bands[band];
 964         BUG_ON(chan_idx >= sband->n_channels);
 965         channel = &sband->channels[chan_idx];
 966
 967         if (is_ht40_not_allowed(channel)) {
 968                 channel->flags |= IEEE80211_CHAN_NO_HT40;
 969                 return;
 970         }
 971
 972         /*
 973          * We need to ensure the extension channels exist to
 974          * be able to use HT40- or HT40+, this finds them (or not)
 975          */
 976         for (i = 0; i < sband->n_channels; i++) {
 977                 struct ieee80211_channel *c = &sband->channels[i];
 978                 if (c->center_freq == (channel->center_freq - 20))
 979                         channel_before = c;
 980                 if (c->center_freq == (channel->center_freq + 20))
 981                         channel_after = c;
 982         }
 983
 984         /*
 985          * Please note that this assumes target bandwidth is 20 MHz,
 986          * if that ever changes we also need to change the below logic
 987          * to include that as well.
 988          */
 989         if (is_ht40_not_allowed(channel_before))
 990                 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
 991         else
 992                 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
 993
 994         if (is_ht40_not_allowed(channel_after))
 995                 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
 996         else
 997                 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
 998 }
 999
1000 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1001                                       enum ieee80211_band band)
1002 {
1003         unsigned int i;
1004         struct ieee80211_supported_band *sband;
1005
1006         BUG_ON(!wiphy->bands[band]);
1007         sband = wiphy->bands[band];
1008
1009         for (i = 0; i < sband->n_channels; i++)
1010                 reg_process_ht_flags_channel(wiphy, band, i);
1011 }
1012
1013 static void reg_process_ht_flags(struct wiphy *wiphy)
1014 {
1015         enum ieee80211_band band;
1016
1017         if (!wiphy)
1018                 return;
1019
1020         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1021                 if (wiphy->bands[band])
1022                         reg_process_ht_flags_band(wiphy, band);
1023         }
1024
1025 }
1026
1027 void wiphy_update_regulatory(struct wiphy *wiphy,
1028                              enum nl80211_reg_initiator initiator)
1029 {
1030         enum ieee80211_band band;
1031
1032         if (ignore_reg_update(wiphy, initiator))
1033                 goto out;
1034         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1035                 if (wiphy->bands[band])
1036                         handle_band(wiphy, band);
1037         }
1038 out:
1039         reg_process_beacons(wiphy);
1040         reg_process_ht_flags(wiphy);
1041         if (wiphy->reg_notifier)
1042                 wiphy->reg_notifier(wiphy, last_request);
1043 }
1044
1045 static void handle_channel_custom(struct wiphy *wiphy,
1046                                   enum ieee80211_band band,
1047                                   unsigned int chan_idx,
1048                                   const struct ieee80211_regdomain *regd)
1049 {
1050         int r;
1051         u32 desired_bw_khz = MHZ_TO_KHZ(20);
1052         u32 bw_flags = 0;
1053         const struct ieee80211_reg_rule *reg_rule = NULL;
1054         const struct ieee80211_power_rule *power_rule = NULL;
1055         const struct ieee80211_freq_range *freq_range = NULL;
1056         struct ieee80211_supported_band *sband;
1057         struct ieee80211_channel *chan;
1058
1059         assert_reg_lock();
1060
1061         sband = wiphy->bands[band];
1062         BUG_ON(chan_idx >= sband->n_channels);
1063         chan = &sband->channels[chan_idx];
1064
1065         r = freq_reg_info_regd(wiphy,
1066                                MHZ_TO_KHZ(chan->center_freq),
1067                                desired_bw_khz,
1068                                &reg_rule,
1069                                regd);
1070
1071         if (r) {
1072                 chan->flags = IEEE80211_CHAN_DISABLED;
1073                 return;
1074         }
1075
1076         power_rule = &reg_rule->power_rule;
1077         freq_range = &reg_rule->freq_range;
1078
1079         if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1080                 bw_flags = IEEE80211_CHAN_NO_HT40;
1081
1082         chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1083         chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1084         chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1085 }
1086
1087 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1088                                const struct ieee80211_regdomain *regd)
1089 {
1090         unsigned int i;
1091         struct ieee80211_supported_band *sband;
1092
1093         BUG_ON(!wiphy->bands[band]);
1094         sband = wiphy->bands[band];
1095
1096         for (i = 0; i < sband->n_channels; i++)
1097                 handle_channel_custom(wiphy, band, i, regd);
1098 }
1099
1100 /* Used by drivers prior to wiphy registration */
1101 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1102                                    const struct ieee80211_regdomain *regd)
1103 {
1104         enum ieee80211_band band;
1105         unsigned int bands_set = 0;
1106
1107         mutex_lock(&reg_mutex);
1108         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1109                 if (!wiphy->bands[band])
1110                         continue;
1111                 handle_band_custom(wiphy, band, regd);
1112                 bands_set++;
1113         }
1114         mutex_unlock(&reg_mutex);
1115
1116         /*
1117          * no point in calling this if it won't have any effect
1118          * on your device's supportd bands.
1119          */
1120         WARN_ON(!bands_set);
1121 }
1122 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1123
1124 /*
1125  * Return value which can be used by ignore_request() to indicate
1126  * it has been determined we should intersect two regulatory domains
1127  */
1128 #define REG_INTERSECT   1
1129
1130 /* This has the logic which determines when a new request
1131  * should be ignored. */
1132 static int ignore_request(struct wiphy *wiphy,
1133                           struct regulatory_request *pending_request)
1134 {
1135         struct wiphy *last_wiphy = NULL;
1136
1137         assert_cfg80211_lock();
1138
1139         /* All initial requests are respected */
1140         if (!last_request)
1141                 return 0;
1142
1143         switch (pending_request->initiator) {
1144         case NL80211_REGDOM_SET_BY_CORE:
1145                 return 0;
1146         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1147
1148                 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1149
1150                 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1151                         return -EINVAL;
1152                 if (last_request->initiator ==
1153                     NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1154                         if (last_wiphy != wiphy) {
1155                                 /*
1156                                  * Two cards with two APs claiming different
1157                                  * Country IE alpha2s. We could
1158                                  * intersect them, but that seems unlikely
1159                                  * to be correct. Reject second one for now.
1160                                  */
1161                                 if (regdom_changes(pending_request->alpha2))
1162                                         return -EOPNOTSUPP;
1163                                 return -EALREADY;
1164                         }
1165                         /*
1166                          * Two consecutive Country IE hints on the same wiphy.
1167                          * This should be picked up early by the driver/stack
1168                          */
1169                         if (WARN_ON(regdom_changes(pending_request->alpha2)))
1170                                 return 0;
1171                         return -EALREADY;
1172                 }
1173                 return REG_INTERSECT;
1174         case NL80211_REGDOM_SET_BY_DRIVER:
1175                 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1176                         if (regdom_changes(pending_request->alpha2))
1177                                 return 0;
1178                         return -EALREADY;
1179                 }
1180
1181                 /*
1182                  * This would happen if you unplug and plug your card
1183                  * back in or if you add a new device for which the previously
1184                  * loaded card also agrees on the regulatory domain.
1185                  */
1186                 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1187                     !regdom_changes(pending_request->alpha2))
1188                         return -EALREADY;
1189
1190                 return REG_INTERSECT;
1191         case NL80211_REGDOM_SET_BY_USER:
1192                 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1193                         return REG_INTERSECT;
1194                 /*
1195                  * If the user knows better the user should set the regdom
1196                  * to their country before the IE is picked up
1197                  */
1198                 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1199                           last_request->intersect)
1200                         return -EOPNOTSUPP;
1201                 /*
1202                  * Process user requests only after previous user/driver/core
1203                  * requests have been processed
1204                  */
1205                 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1206                     last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1207                     last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1208                         if (regdom_changes(last_request->alpha2))
1209                                 return -EAGAIN;
1210                 }
1211
1212                 if (!regdom_changes(pending_request->alpha2))
1213                         return -EALREADY;
1214
1215                 return 0;
1216         }
1217
1218         return -EINVAL;
1219 }
1220
1221 /**
1222  * __regulatory_hint - hint to the wireless core a regulatory domain
1223  * @wiphy: if the hint comes from country information from an AP, this
1224  *      is required to be set to the wiphy that received the information
1225  * @pending_request: the regulatory request currently being processed
1226  *
1227  * The Wireless subsystem can use this function to hint to the wireless core
1228  * what it believes should be the current regulatory domain.
1229  *
1230  * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1231  * already been set or other standard error codes.
1232  *
1233  * Caller must hold &cfg80211_mutex and &reg_mutex
1234  */
1235 static int __regulatory_hint(struct wiphy *wiphy,
1236                              struct regulatory_request *pending_request)
1237 {
1238         bool intersect = false;
1239         int r = 0;
1240
1241         assert_cfg80211_lock();
1242
1243         r = ignore_request(wiphy, pending_request);
1244
1245         if (r == REG_INTERSECT) {
1246                 if (pending_request->initiator ==
1247                     NL80211_REGDOM_SET_BY_DRIVER) {
1248                         r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1249                         if (r) {
1250                                 kfree(pending_request);
1251                                 return r;
1252                         }
1253                 }
1254                 intersect = true;
1255         } else if (r) {
1256                 /*
1257                  * If the regulatory domain being requested by the
1258                  * driver has already been set just copy it to the
1259                  * wiphy
1260                  */
1261                 if (r == -EALREADY &&
1262                     pending_request->initiator ==
1263                     NL80211_REGDOM_SET_BY_DRIVER) {
1264                         r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1265                         if (r) {
1266                                 kfree(pending_request);
1267                                 return r;
1268                         }
1269                         r = -EALREADY;
1270                         goto new_request;
1271                 }
1272                 kfree(pending_request);
1273                 return r;
1274         }
1275
1276 new_request:
1277         kfree(last_request);
1278
1279         last_request = pending_request;
1280         last_request->intersect = intersect;
1281
1282         pending_request = NULL;
1283
1284         if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1285                 user_alpha2[0] = last_request->alpha2[0];
1286                 user_alpha2[1] = last_request->alpha2[1];
1287         }
1288
1289         /* When r == REG_INTERSECT we do need to call CRDA */
1290         if (r < 0) {
1291                 /*
1292                  * Since CRDA will not be called in this case as we already
1293                  * have applied the requested regulatory domain before we just
1294                  * inform userspace we have processed the request
1295                  */
1296                 if (r == -EALREADY)
1297                         nl80211_send_reg_change_event(last_request);
1298                 return r;
1299         }
1300
1301         return call_crda(last_request->alpha2);
1302 }
1303
1304 /* This processes *all* regulatory hints */
1305 static void reg_process_hint(struct regulatory_request *reg_request)
1306 {
1307         int r = 0;
1308         struct wiphy *wiphy = NULL;
1309         enum nl80211_reg_initiator initiator = reg_request->initiator;
1310
1311         BUG_ON(!reg_request->alpha2);
1312
1313         mutex_lock(&cfg80211_mutex);
1314         mutex_lock(&reg_mutex);
1315
1316         if (wiphy_idx_valid(reg_request->wiphy_idx))
1317                 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1318
1319         if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1320             !wiphy) {
1321                 kfree(reg_request);
1322                 goto out;
1323         }
1324
1325         r = __regulatory_hint(wiphy, reg_request);
1326         /* This is required so that the orig_* parameters are saved */
1327         if (r == -EALREADY && wiphy &&
1328             wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
1329                 wiphy_update_regulatory(wiphy, initiator);
1330 out:
1331         mutex_unlock(&reg_mutex);
1332         mutex_unlock(&cfg80211_mutex);
1333 }
1334
1335 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
1336 static void reg_process_pending_hints(void)
1337         {
1338         struct regulatory_request *reg_request;
1339
1340         spin_lock(&reg_requests_lock);
1341         while (!list_empty(&reg_requests_list)) {
1342                 reg_request = list_first_entry(&reg_requests_list,
1343                                                struct regulatory_request,
1344                                                list);
1345                 list_del_init(&reg_request->list);
1346
1347                 spin_unlock(&reg_requests_lock);
1348                 reg_process_hint(reg_request);
1349                 spin_lock(&reg_requests_lock);
1350         }
1351         spin_unlock(&reg_requests_lock);
1352 }
1353
1354 /* Processes beacon hints -- this has nothing to do with country IEs */
1355 static void reg_process_pending_beacon_hints(void)
1356 {
1357         struct cfg80211_registered_device *rdev;
1358         struct reg_beacon *pending_beacon, *tmp;
1359
1360         /*
1361          * No need to hold the reg_mutex here as we just touch wiphys
1362          * and do not read or access regulatory variables.
1363          */
1364         mutex_lock(&cfg80211_mutex);
1365
1366         /* This goes through the _pending_ beacon list */
1367         spin_lock_bh(&reg_pending_beacons_lock);
1368
1369         if (list_empty(&reg_pending_beacons)) {
1370                 spin_unlock_bh(&reg_pending_beacons_lock);
1371                 goto out;
1372         }
1373
1374         list_for_each_entry_safe(pending_beacon, tmp,
1375                                  &reg_pending_beacons, list) {
1376
1377                 list_del_init(&pending_beacon->list);
1378
1379                 /* Applies the beacon hint to current wiphys */
1380                 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1381                         wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1382
1383                 /* Remembers the beacon hint for new wiphys or reg changes */
1384                 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1385         }
1386
1387         spin_unlock_bh(&reg_pending_beacons_lock);
1388 out:
1389         mutex_unlock(&cfg80211_mutex);
1390 }
1391
1392 static void reg_todo(struct work_struct *work)
1393 {
1394         reg_process_pending_hints();
1395         reg_process_pending_beacon_hints();
1396 }
1397
1398 static DECLARE_WORK(reg_work, reg_todo);
1399
1400 static void queue_regulatory_request(struct regulatory_request *request)
1401 {
1402         spin_lock(&reg_requests_lock);
1403         list_add_tail(&request->list, &reg_requests_list);
1404         spin_unlock(&reg_requests_lock);
1405
1406         schedule_work(&reg_work);
1407 }
1408
1409 /*
1410  * Core regulatory hint -- happens during cfg80211_init()
1411  * and when we restore regulatory settings.
1412  */
1413 static int regulatory_hint_core(const char *alpha2)
1414 {
1415         struct regulatory_request *request;
1416
1417         kfree(last_request);
1418         last_request = NULL;
1419
1420         request = kzalloc(sizeof(struct regulatory_request),
1421                           GFP_KERNEL);
1422         if (!request)
1423                 return -ENOMEM;
1424
1425         request->alpha2[0] = alpha2[0];
1426         request->alpha2[1] = alpha2[1];
1427         request->initiator = NL80211_REGDOM_SET_BY_CORE;
1428
1429         /*
1430          * This ensures last_request is populated once modules
1431          * come swinging in and calling regulatory hints and
1432          * wiphy_apply_custom_regulatory().
1433          */
1434         reg_process_hint(request);
1435
1436         return 0;
1437 }
1438
1439 /* User hints */
1440 int regulatory_hint_user(const char *alpha2)
1441 {
1442         struct regulatory_request *request;
1443
1444         BUG_ON(!alpha2);
1445
1446         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1447         if (!request)
1448                 return -ENOMEM;
1449
1450         request->wiphy_idx = WIPHY_IDX_STALE;
1451         request->alpha2[0] = alpha2[0];
1452         request->alpha2[1] = alpha2[1];
1453         request->initiator = NL80211_REGDOM_SET_BY_USER;
1454
1455         queue_regulatory_request(request);
1456
1457         return 0;
1458 }
1459
1460 /* Driver hints */
1461 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1462 {
1463         struct regulatory_request *request;
1464
1465         BUG_ON(!alpha2);
1466         BUG_ON(!wiphy);
1467
1468         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1469         if (!request)
1470                 return -ENOMEM;
1471
1472         request->wiphy_idx = get_wiphy_idx(wiphy);
1473
1474         /* Must have registered wiphy first */
1475         BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1476
1477         request->alpha2[0] = alpha2[0];
1478         request->alpha2[1] = alpha2[1];
1479         request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1480
1481         queue_regulatory_request(request);
1482
1483         return 0;
1484 }
1485 EXPORT_SYMBOL(regulatory_hint);
1486
1487 /*
1488  * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1489  * therefore cannot iterate over the rdev list here.
1490  */
1491 void regulatory_hint_11d(struct wiphy *wiphy,
1492                          enum ieee80211_band band,
1493                          u8 *country_ie,
1494                          u8 country_ie_len)
1495 {
1496         char alpha2[2];
1497         enum environment_cap env = ENVIRON_ANY;
1498         struct regulatory_request *request;
1499
1500         mutex_lock(&reg_mutex);
1501
1502         if (unlikely(!last_request))
1503                 goto out;
1504
1505         /* IE len must be evenly divisible by 2 */
1506         if (country_ie_len & 0x01)
1507                 goto out;
1508
1509         if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1510                 goto out;
1511
1512         alpha2[0] = country_ie[0];
1513         alpha2[1] = country_ie[1];
1514
1515         if (country_ie[2] == 'I')
1516                 env = ENVIRON_INDOOR;
1517         else if (country_ie[2] == 'O')
1518                 env = ENVIRON_OUTDOOR;
1519
1520         /*
1521          * We will run this only upon a successful connection on cfg80211.
1522          * We leave conflict resolution to the workqueue, where can hold
1523          * cfg80211_mutex.
1524          */
1525         if (likely(last_request->initiator ==
1526             NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1527             wiphy_idx_valid(last_request->wiphy_idx)))
1528                 goto out;
1529
1530         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1531         if (!request)
1532                 goto out;
1533
1534         request->wiphy_idx = get_wiphy_idx(wiphy);
1535         request->alpha2[0] = alpha2[0];
1536         request->alpha2[1] = alpha2[1];
1537         request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1538         request->country_ie_env = env;
1539
1540         mutex_unlock(&reg_mutex);
1541
1542         queue_regulatory_request(request);
1543
1544         return;
1545
1546 out:
1547         mutex_unlock(&reg_mutex);
1548 }
1549
1550 static void restore_alpha2(char *alpha2, bool reset_user)
1551 {
1552         /* indicates there is no alpha2 to consider for restoration */
1553         alpha2[0] = '9';
1554         alpha2[1] = '7';
1555
1556         /* The user setting has precedence over the module parameter */
1557         if (is_user_regdom_saved()) {
1558                 /* Unless we're asked to ignore it and reset it */
1559                 if (reset_user) {
1560                         REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
1561                                "including user preference\n");
1562                         user_alpha2[0] = '9';
1563                         user_alpha2[1] = '7';
1564
1565                         /*
1566                          * If we're ignoring user settings, we still need to
1567                          * check the module parameter to ensure we put things
1568                          * back as they were for a full restore.
1569                          */
1570                         if (!is_world_regdom(ieee80211_regdom)) {
1571                                 REG_DBG_PRINT("cfg80211: Keeping preference on "
1572                                        "module parameter ieee80211_regdom: %c%c\n",
1573                                        ieee80211_regdom[0],
1574                                        ieee80211_regdom[1]);
1575                                 alpha2[0] = ieee80211_regdom[0];
1576                                 alpha2[1] = ieee80211_regdom[1];
1577                         }
1578                 } else {
1579                         REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
1580                                "while preserving user preference for: %c%c\n",
1581                                user_alpha2[0],
1582                                user_alpha2[1]);
1583                         alpha2[0] = user_alpha2[0];
1584                         alpha2[1] = user_alpha2[1];
1585                 }
1586         } else if (!is_world_regdom(ieee80211_regdom)) {
1587                 REG_DBG_PRINT("cfg80211: Keeping preference on "
1588                        "module parameter ieee80211_regdom: %c%c\n",
1589                        ieee80211_regdom[0],
1590                        ieee80211_regdom[1]);
1591                 alpha2[0] = ieee80211_regdom[0];
1592                 alpha2[1] = ieee80211_regdom[1];
1593         } else
1594                 REG_DBG_PRINT("cfg80211: Restoring regulatory settings\n");
1595 }
1596
1597 /*
1598  * Restoring regulatory settings involves ingoring any
1599  * possibly stale country IE information and user regulatory
1600  * settings if so desired, this includes any beacon hints
1601  * learned as we could have traveled outside to another country
1602  * after disconnection. To restore regulatory settings we do
1603  * exactly what we did at bootup:
1604  *
1605  *   - send a core regulatory hint
1606  *   - send a user regulatory hint if applicable
1607  *
1608  * Device drivers that send a regulatory hint for a specific country
1609  * keep their own regulatory domain on wiphy->regd so that does does
1610  * not need to be remembered.
1611  */
1612 static void restore_regulatory_settings(bool reset_user)
1613 {
1614         char alpha2[2];
1615         struct reg_beacon *reg_beacon, *btmp;
1616
1617         mutex_lock(&cfg80211_mutex);
1618         mutex_lock(&reg_mutex);
1619
1620         reset_regdomains();
1621         restore_alpha2(alpha2, reset_user);
1622
1623         /* Clear beacon hints */
1624         spin_lock_bh(&reg_pending_beacons_lock);
1625         if (!list_empty(&reg_pending_beacons)) {
1626                 list_for_each_entry_safe(reg_beacon, btmp,
1627                                          &reg_pending_beacons, list) {
1628                         list_del(&reg_beacon->list);
1629                         kfree(reg_beacon);
1630                 }
1631         }
1632         spin_unlock_bh(&reg_pending_beacons_lock);
1633
1634         if (!list_empty(&reg_beacon_list)) {
1635                 list_for_each_entry_safe(reg_beacon, btmp,
1636                                          &reg_beacon_list, list) {
1637                         list_del(&reg_beacon->list);
1638                         kfree(reg_beacon);
1639                 }
1640         }
1641
1642         /* First restore to the basic regulatory settings */
1643         cfg80211_regdomain = cfg80211_world_regdom;
1644
1645         mutex_unlock(&reg_mutex);
1646         mutex_unlock(&cfg80211_mutex);
1647
1648         regulatory_hint_core(cfg80211_regdomain->alpha2);
1649
1650         /*
1651          * This restores the ieee80211_regdom module parameter
1652          * preference or the last user requested regulatory
1653          * settings, user regulatory settings takes precedence.
1654          */
1655         if (is_an_alpha2(alpha2))
1656                 regulatory_hint_user(user_alpha2);
1657 }
1658
1659
1660 void regulatory_hint_disconnect(void)
1661 {
1662         REG_DBG_PRINT("cfg80211: All devices are disconnected, going to "
1663                       "restore regulatory settings\n");
1664         restore_regulatory_settings(false);
1665 }
1666
1667 static bool freq_is_chan_12_13_14(u16 freq)
1668 {
1669         if (freq == ieee80211_channel_to_frequency(12) ||
1670             freq == ieee80211_channel_to_frequency(13) ||
1671             freq == ieee80211_channel_to_frequency(14))
1672                 return true;
1673         return false;
1674 }
1675
1676 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1677                                  struct ieee80211_channel *beacon_chan,
1678                                  gfp_t gfp)
1679 {
1680         struct reg_beacon *reg_beacon;
1681
1682         if (likely((beacon_chan->beacon_found ||
1683             (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1684             (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1685              !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1686                 return 0;
1687
1688         reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1689         if (!reg_beacon)
1690                 return -ENOMEM;
1691
1692         REG_DBG_PRINT("cfg80211: Found new beacon on "
1693                       "frequency: %d MHz (Ch %d) on %s\n",
1694                       beacon_chan->center_freq,
1695                       ieee80211_frequency_to_channel(beacon_chan->center_freq),
1696                       wiphy_name(wiphy));
1697
1698         memcpy(&reg_beacon->chan, beacon_chan,
1699                 sizeof(struct ieee80211_channel));
1700
1701
1702         /*
1703          * Since we can be called from BH or and non-BH context
1704          * we must use spin_lock_bh()
1705          */
1706         spin_lock_bh(&reg_pending_beacons_lock);
1707         list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1708         spin_unlock_bh(&reg_pending_beacons_lock);
1709
1710         schedule_work(&reg_work);
1711
1712         return 0;
1713 }
1714
1715 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1716 {
1717         unsigned int i;
1718         const struct ieee80211_reg_rule *reg_rule = NULL;
1719         const struct ieee80211_freq_range *freq_range = NULL;
1720         const struct ieee80211_power_rule *power_rule = NULL;
1721
1722         printk(KERN_INFO "    (start_freq - end_freq @ bandwidth), "
1723                 "(max_antenna_gain, max_eirp)\n");
1724
1725         for (i = 0; i < rd->n_reg_rules; i++) {
1726                 reg_rule = &rd->reg_rules[i];
1727                 freq_range = &reg_rule->freq_range;
1728                 power_rule = &reg_rule->power_rule;
1729
1730                 /*
1731                  * There may not be documentation for max antenna gain
1732                  * in certain regions
1733                  */
1734                 if (power_rule->max_antenna_gain)
1735                         printk(KERN_INFO "    (%d KHz - %d KHz @ %d KHz), "
1736                                 "(%d mBi, %d mBm)\n",
1737                                 freq_range->start_freq_khz,
1738                                 freq_range->end_freq_khz,
1739                                 freq_range->max_bandwidth_khz,
1740                                 power_rule->max_antenna_gain,
1741                                 power_rule->max_eirp);
1742                 else
1743                         printk(KERN_INFO "    (%d KHz - %d KHz @ %d KHz), "
1744                                 "(N/A, %d mBm)\n",
1745                                 freq_range->start_freq_khz,
1746                                 freq_range->end_freq_khz,
1747                                 freq_range->max_bandwidth_khz,
1748                                 power_rule->max_eirp);
1749         }
1750 }
1751
1752 static void print_regdomain(const struct ieee80211_regdomain *rd)
1753 {
1754
1755         if (is_intersected_alpha2(rd->alpha2)) {
1756
1757                 if (last_request->initiator ==
1758                     NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1759                         struct cfg80211_registered_device *rdev;
1760                         rdev = cfg80211_rdev_by_wiphy_idx(
1761                                 last_request->wiphy_idx);
1762                         if (rdev) {
1763                                 printk(KERN_INFO "cfg80211: Current regulatory "
1764                                         "domain updated by AP to: %c%c\n",
1765                                         rdev->country_ie_alpha2[0],
1766                                         rdev->country_ie_alpha2[1]);
1767                         } else
1768                                 printk(KERN_INFO "cfg80211: Current regulatory "
1769                                         "domain intersected:\n");
1770                 } else
1771                         printk(KERN_INFO "cfg80211: Current regulatory "
1772                                 "domain intersected:\n");
1773         } else if (is_world_regdom(rd->alpha2))
1774                 printk(KERN_INFO "cfg80211: World regulatory "
1775                         "domain updated:\n");
1776         else {
1777                 if (is_unknown_alpha2(rd->alpha2))
1778                         printk(KERN_INFO "cfg80211: Regulatory domain "
1779                                 "changed to driver built-in settings "
1780                                 "(unknown country)\n");
1781                 else
1782                         printk(KERN_INFO "cfg80211: Regulatory domain "
1783                                 "changed to country: %c%c\n",
1784                                 rd->alpha2[0], rd->alpha2[1]);
1785         }
1786         print_rd_rules(rd);
1787 }
1788
1789 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1790 {
1791         printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1792                 rd->alpha2[0], rd->alpha2[1]);
1793         print_rd_rules(rd);
1794 }
1795
1796 /* Takes ownership of rd only if it doesn't fail */
1797 static int __set_regdom(const struct ieee80211_regdomain *rd)
1798 {
1799         const struct ieee80211_regdomain *intersected_rd = NULL;
1800         struct cfg80211_registered_device *rdev = NULL;
1801         struct wiphy *request_wiphy;
1802         /* Some basic sanity checks first */
1803
1804         if (is_world_regdom(rd->alpha2)) {
1805                 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1806                         return -EINVAL;
1807                 update_world_regdomain(rd);
1808                 return 0;
1809         }
1810
1811         if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1812                         !is_unknown_alpha2(rd->alpha2))
1813                 return -EINVAL;
1814
1815         if (!last_request)
1816                 return -EINVAL;
1817
1818         /*
1819          * Lets only bother proceeding on the same alpha2 if the current
1820          * rd is non static (it means CRDA was present and was used last)
1821          * and the pending request came in from a country IE
1822          */
1823         if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1824                 /*
1825                  * If someone else asked us to change the rd lets only bother
1826                  * checking if the alpha2 changes if CRDA was already called
1827                  */
1828                 if (!regdom_changes(rd->alpha2))
1829                         return -EINVAL;
1830         }
1831
1832         /*
1833          * Now lets set the regulatory domain, update all driver channels
1834          * and finally inform them of what we have done, in case they want
1835          * to review or adjust their own settings based on their own
1836          * internal EEPROM data
1837          */
1838
1839         if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1840                 return -EINVAL;
1841
1842         if (!is_valid_rd(rd)) {
1843                 printk(KERN_ERR "cfg80211: Invalid "
1844                         "regulatory domain detected:\n");
1845                 print_regdomain_info(rd);
1846                 return -EINVAL;
1847         }
1848
1849         request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1850
1851         if (!last_request->intersect) {
1852                 int r;
1853
1854                 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
1855                         reset_regdomains();
1856                         cfg80211_regdomain = rd;
1857                         return 0;
1858                 }
1859
1860                 /*
1861                  * For a driver hint, lets copy the regulatory domain the
1862                  * driver wanted to the wiphy to deal with conflicts
1863                  */
1864
1865                 /*
1866                  * Userspace could have sent two replies with only
1867                  * one kernel request.
1868                  */
1869                 if (request_wiphy->regd)
1870                         return -EALREADY;
1871
1872                 r = reg_copy_regd(&request_wiphy->regd, rd);
1873                 if (r)
1874                         return r;
1875
1876                 reset_regdomains();
1877                 cfg80211_regdomain = rd;
1878                 return 0;
1879         }
1880
1881         /* Intersection requires a bit more work */
1882
1883         if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1884
1885                 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1886                 if (!intersected_rd)
1887                         return -EINVAL;
1888
1889                 /*
1890                  * We can trash what CRDA provided now.
1891                  * However if a driver requested this specific regulatory
1892                  * domain we keep it for its private use
1893                  */
1894                 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
1895                         request_wiphy->regd = rd;
1896                 else
1897                         kfree(rd);
1898
1899                 rd = NULL;
1900
1901                 reset_regdomains();
1902                 cfg80211_regdomain = intersected_rd;
1903
1904                 return 0;
1905         }
1906
1907         if (!intersected_rd)
1908                 return -EINVAL;
1909
1910         rdev = wiphy_to_dev(request_wiphy);
1911
1912         rdev->country_ie_alpha2[0] = rd->alpha2[0];
1913         rdev->country_ie_alpha2[1] = rd->alpha2[1];
1914         rdev->env = last_request->country_ie_env;
1915
1916         BUG_ON(intersected_rd == rd);
1917
1918         kfree(rd);
1919         rd = NULL;
1920
1921         reset_regdomains();
1922         cfg80211_regdomain = intersected_rd;
1923
1924         return 0;
1925 }
1926
1927
1928 /*
1929  * Use this call to set the current regulatory domain. Conflicts with
1930  * multiple drivers can be ironed out later. Caller must've already
1931  * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
1932  */
1933 int set_regdom(const struct ieee80211_regdomain *rd)
1934 {
1935         int r;
1936
1937         assert_cfg80211_lock();
1938
1939         mutex_lock(&reg_mutex);
1940
1941         /* Note that this doesn't update the wiphys, this is done below */
1942         r = __set_regdom(rd);
1943         if (r) {
1944                 kfree(rd);
1945                 mutex_unlock(&reg_mutex);
1946                 return r;
1947         }
1948
1949         /* This would make this whole thing pointless */
1950         if (!last_request->intersect)
1951                 BUG_ON(rd != cfg80211_regdomain);
1952
1953         /* update all wiphys now with the new established regulatory domain */
1954         update_all_wiphy_regulatory(last_request->initiator);
1955
1956         print_regdomain(cfg80211_regdomain);
1957
1958         nl80211_send_reg_change_event(last_request);
1959
1960         mutex_unlock(&reg_mutex);
1961
1962         return r;
1963 }
1964
1965 /* Caller must hold cfg80211_mutex */
1966 void reg_device_remove(struct wiphy *wiphy)
1967 {
1968         struct wiphy *request_wiphy = NULL;
1969
1970         assert_cfg80211_lock();
1971
1972         mutex_lock(&reg_mutex);
1973
1974         kfree(wiphy->regd);
1975
1976         if (last_request)
1977                 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1978
1979         if (!request_wiphy || request_wiphy != wiphy)
1980                 goto out;
1981
1982         last_request->wiphy_idx = WIPHY_IDX_STALE;
1983         last_request->country_ie_env = ENVIRON_ANY;
1984 out:
1985         mutex_unlock(&reg_mutex);
1986 }
1987
1988 int __init regulatory_init(void)
1989 {
1990         int err = 0;
1991
1992         reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
1993         if (IS_ERR(reg_pdev))
1994                 return PTR_ERR(reg_pdev);
1995
1996         spin_lock_init(&reg_requests_lock);
1997         spin_lock_init(&reg_pending_beacons_lock);
1998
1999         cfg80211_regdomain = cfg80211_world_regdom;
2000
2001         user_alpha2[0] = '9';
2002         user_alpha2[1] = '7';
2003
2004         /* We always try to get an update for the static regdomain */
2005         err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2006         if (err) {
2007                 if (err == -ENOMEM)
2008                         return err;
2009                 /*
2010                  * N.B. kobject_uevent_env() can fail mainly for when we're out
2011                  * memory which is handled and propagated appropriately above
2012                  * but it can also fail during a netlink_broadcast() or during
2013                  * early boot for call_usermodehelper(). For now treat these
2014                  * errors as non-fatal.
2015                  */
2016                 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
2017                         "to call CRDA during init");
2018 #ifdef CONFIG_CFG80211_REG_DEBUG
2019                 /* We want to find out exactly why when debugging */
2020                 WARN_ON(err);
2021 #endif
2022         }
2023
2024         /*
2025          * Finally, if the user set the module parameter treat it
2026          * as a user hint.
2027          */
2028         if (!is_world_regdom(ieee80211_regdom))
2029                 regulatory_hint_user(ieee80211_regdom);
2030
2031         return 0;
2032 }
2033
2034 void /* __init_or_exit */ regulatory_exit(void)
2035 {
2036         struct regulatory_request *reg_request, *tmp;
2037         struct reg_beacon *reg_beacon, *btmp;
2038
2039         cancel_work_sync(&reg_work);
2040
2041         mutex_lock(&cfg80211_mutex);
2042         mutex_lock(&reg_mutex);
2043
2044         reset_regdomains();
2045
2046         kfree(last_request);
2047
2048         platform_device_unregister(reg_pdev);
2049
2050         spin_lock_bh(&reg_pending_beacons_lock);
2051         if (!list_empty(&reg_pending_beacons)) {
2052                 list_for_each_entry_safe(reg_beacon, btmp,
2053                                          &reg_pending_beacons, list) {
2054                         list_del(&reg_beacon->list);
2055                         kfree(reg_beacon);
2056                 }
2057         }
2058         spin_unlock_bh(&reg_pending_beacons_lock);
2059
2060         if (!list_empty(&reg_beacon_list)) {
2061                 list_for_each_entry_safe(reg_beacon, btmp,
2062                                          &reg_beacon_list, list) {
2063                         list_del(&reg_beacon->list);
2064                         kfree(reg_beacon);
2065                 }
2066         }
2067
2068         spin_lock(&reg_requests_lock);
2069         if (!list_empty(&reg_requests_list)) {
2070                 list_for_each_entry_safe(reg_request, tmp,
2071                                          &reg_requests_list, list) {
2072                         list_del(&reg_request->list);
2073                         kfree(reg_request);
2074                 }
2075         }
2076         spin_unlock(&reg_requests_lock);
2077
2078         mutex_unlock(&reg_mutex);
2079         mutex_unlock(&cfg80211_mutex);
2080 }