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
  36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  37
  38 #include <linux/kernel.h>
  39 #include <linux/slab.h>
  40 #include <linux/list.h>
  41 #include <linux/random.h>
  42 #include <linux/ctype.h>
  43 #include <linux/nl80211.h>
  44 #include <linux/platform_device.h>
  45 #include <net/cfg80211.h>
  46 #include "core.h"
  47 #include "reg.h"
  48 #include "regdb.h"
  49 #include "nl80211.h"
  50
  51 #ifdef CONFIG_CFG80211_REG_DEBUG
  52 #define REG_DBG_PRINT(format, args...) \
  53         do { \
  54                 printk(KERN_DEBUG pr_fmt(format), ##args);      \
  55         } while (0)
  56 #else
  57 #define REG_DBG_PRINT(args...)
  58 #endif
  59
  60 /* Receipt of information from last regulatory request */
  61 static struct regulatory_request *last_request;
  62
  63 /* To trigger userspace events */
  64 static struct platform_device *reg_pdev;
  65
  66 static struct device_type reg_device_type = {
  67         .uevent = reg_device_uevent,
  68 };
  69
  70 /*
  71  * Central wireless core regulatory domains, we only need two,
  72  * the current one and a world regulatory domain in case we have no
  73  * information to give us an alpha2
  74  */
  75 const struct ieee80211_regdomain *cfg80211_regdomain;
  76
  77 /*
  78  * Protects static reg.c components:
  79  *     - cfg80211_world_regdom
  80  *     - cfg80211_regdom
  81  *     - last_request
  82  */
  83 static DEFINE_MUTEX(reg_mutex);
  84
  85 static inline void assert_reg_lock(void)
  86 {
  87         lockdep_assert_held(&reg_mutex);
  88 }
  89
  90 /* Used to queue up regulatory hints */
  91 static LIST_HEAD(reg_requests_list);
  92 static spinlock_t reg_requests_lock;
  93
  94 /* Used to queue up beacon hints for review */
  95 static LIST_HEAD(reg_pending_beacons);
  96 static spinlock_t reg_pending_beacons_lock;
  97
  98 /* Used to keep track of processed beacon hints */
  99 static LIST_HEAD(reg_beacon_list);
 100
 101 struct reg_beacon {
 102         struct list_head list;
 103         struct ieee80211_channel chan;
 104 };
 105
 106 static void reg_todo(struct work_struct *work);
 107 static DECLARE_WORK(reg_work, reg_todo);
 108
 109 static void reg_timeout_work(struct work_struct *work);
 110 static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
 111
 112 /* We keep a static world regulatory domain in case of the absence of CRDA */
 113 static const struct ieee80211_regdomain world_regdom = {
 114         .n_reg_rules = 5,
 115         .alpha2 =  "00",
 116         .reg_rules = {
 117                 /* IEEE 802.11b/g, channels 1..11 */
 118                 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
 119                 /* IEEE 802.11b/g, channels 12..13. No HT40
 120                  * channel fits here. */
 121                 REG_RULE(2467-10, 2472+10, 20, 6, 20,
 122                         NL80211_RRF_PASSIVE_SCAN |
 123                         NL80211_RRF_NO_IBSS),
 124                 /* IEEE 802.11 channel 14 - Only JP enables
 125                  * this and for 802.11b only */
 126                 REG_RULE(2484-10, 2484+10, 20, 6, 20,
 127                         NL80211_RRF_PASSIVE_SCAN |
 128                         NL80211_RRF_NO_IBSS |
 129                         NL80211_RRF_NO_OFDM),
 130                 /* IEEE 802.11a, channel 36..48 */
 131                 REG_RULE(5180-10, 5240+10, 40, 6, 20,
 132                         NL80211_RRF_PASSIVE_SCAN |
 133                         NL80211_RRF_NO_IBSS),
 134
 135                 /* NB: 5260 MHz - 5700 MHz requies DFS */
 136
 137                 /* IEEE 802.11a, channel 149..165 */
 138                 REG_RULE(5745-10, 5825+10, 40, 6, 20,
 139                         NL80211_RRF_PASSIVE_SCAN |
 140                         NL80211_RRF_NO_IBSS),
 141         }
 142 };
 143
 144 static const struct ieee80211_regdomain *cfg80211_world_regdom =
 145         &world_regdom;
 146
 147 static char *ieee80211_regdom = "00";
 148 static char user_alpha2[2];
 149
 150 module_param(ieee80211_regdom, charp, 0444);
 151 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
 152
 153 static void reset_regdomains(void)
 154 {
 155         /* avoid freeing static information or freeing something twice */
 156         if (cfg80211_regdomain == cfg80211_world_regdom)
 157                 cfg80211_regdomain = NULL;
 158         if (cfg80211_world_regdom == &world_regdom)
 159                 cfg80211_world_regdom = NULL;
 160         if (cfg80211_regdomain == &world_regdom)
 161                 cfg80211_regdomain = NULL;
 162
 163         kfree(cfg80211_regdomain);
 164         kfree(cfg80211_world_regdom);
 165
 166         cfg80211_world_regdom = &world_regdom;
 167         cfg80211_regdomain = NULL;
 168 }
 169
 170 /*
 171  * Dynamic world regulatory domain requested by the wireless
 172  * core upon initialization
 173  */
 174 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
 175 {
 176         BUG_ON(!last_request);
 177
 178         reset_regdomains();
 179
 180         cfg80211_world_regdom = rd;
 181         cfg80211_regdomain = rd;
 182 }
 183
 184 bool is_world_regdom(const char *alpha2)
 185 {
 186         if (!alpha2)
 187                 return false;
 188         if (alpha2[0] == '0' && alpha2[1] == '0')
 189                 return true;
 190         return false;
 191 }
 192
 193 static bool is_alpha2_set(const char *alpha2)
 194 {
 195         if (!alpha2)
 196                 return false;
 197         if (alpha2[0] != 0 && alpha2[1] != 0)
 198                 return true;
 199         return false;
 200 }
 201
 202 static bool is_unknown_alpha2(const char *alpha2)
 203 {
 204         if (!alpha2)
 205                 return false;
 206         /*
 207          * Special case where regulatory domain was built by driver
 208          * but a specific alpha2 cannot be determined
 209          */
 210         if (alpha2[0] == '9' && alpha2[1] == '9')
 211                 return true;
 212         return false;
 213 }
 214
 215 static bool is_intersected_alpha2(const char *alpha2)
 216 {
 217         if (!alpha2)
 218                 return false;
 219         /*
 220          * Special case where regulatory domain is the
 221          * result of an intersection between two regulatory domain
 222          * structures
 223          */
 224         if (alpha2[0] == '9' && alpha2[1] == '8')
 225                 return true;
 226         return false;
 227 }
 228
 229 static bool is_an_alpha2(const char *alpha2)
 230 {
 231         if (!alpha2)
 232                 return false;
 233         if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
 234                 return true;
 235         return false;
 236 }
 237
 238 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
 239 {
 240         if (!alpha2_x || !alpha2_y)
 241                 return false;
 242         if (alpha2_x[0] == alpha2_y[0] &&
 243                 alpha2_x[1] == alpha2_y[1])
 244                 return true;
 245         return false;
 246 }
 247
 248 static bool regdom_changes(const char *alpha2)
 249 {
 250         assert_cfg80211_lock();
 251
 252         if (!cfg80211_regdomain)
 253                 return true;
 254         if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
 255                 return false;
 256         return true;
 257 }
 258
 259 /*
 260  * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
 261  * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
 262  * has ever been issued.
 263  */
 264 static bool is_user_regdom_saved(void)
 265 {
 266         if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
 267                 return false;
 268
 269         /* This would indicate a mistake on the design */
 270         if (WARN((!is_world_regdom(user_alpha2) &&
 271                   !is_an_alpha2(user_alpha2)),
 272                  "Unexpected user alpha2: %c%c\n",
 273                  user_alpha2[0],
 274                  user_alpha2[1]))
 275                 return false;
 276
 277         return true;
 278 }
 279
 280 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
 281                          const struct ieee80211_regdomain *src_regd)
 282 {
 283         struct ieee80211_regdomain *regd;
 284         int size_of_regd = 0;
 285         unsigned int i;
 286
 287         size_of_regd = sizeof(struct ieee80211_regdomain) +
 288           ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
 289
 290         regd = kzalloc(size_of_regd, GFP_KERNEL);
 291         if (!regd)
 292                 return -ENOMEM;
 293
 294         memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
 295
 296         for (i = 0; i < src_regd->n_reg_rules; i++)
 297                 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
 298                         sizeof(struct ieee80211_reg_rule));
 299
 300         *dst_regd = regd;
 301         return 0;
 302 }
 303
 304 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
 305 struct reg_regdb_search_request {
 306         char alpha2[2];
 307         struct list_head list;
 308 };
 309
 310 static LIST_HEAD(reg_regdb_search_list);
 311 static DEFINE_MUTEX(reg_regdb_search_mutex);
 312
 313 static void reg_regdb_search(struct work_struct *work)
 314 {
 315         struct reg_regdb_search_request *request;
 316         const struct ieee80211_regdomain *curdom, *regdom;
 317         int i, r;
 318
 319         mutex_lock(&reg_regdb_search_mutex);
 320         while (!list_empty(&reg_regdb_search_list)) {
 321                 request = list_first_entry(&reg_regdb_search_list,
 322                                            struct reg_regdb_search_request,
 323                                            list);
 324                 list_del(&request->list);
 325
 326                 for (i=0; i<reg_regdb_size; i++) {
 327                         curdom = reg_regdb[i];
 328
 329                         if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
 330                                 r = reg_copy_regd(&regdom, curdom);
 331                                 if (r)
 332                                         break;
 333                                 mutex_lock(&cfg80211_mutex);
 334                                 set_regdom(regdom);
 335                                 mutex_unlock(&cfg80211_mutex);
 336                                 break;
 337                         }
 338                 }
 339
 340                 kfree(request);
 341         }
 342         mutex_unlock(&reg_regdb_search_mutex);
 343 }
 344
 345 static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
 346
 347 static void reg_regdb_query(const char *alpha2)
 348 {
 349         struct reg_regdb_search_request *request;
 350
 351         if (!alpha2)
 352                 return;
 353
 354         request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
 355         if (!request)
 356                 return;
 357
 358         memcpy(request->alpha2, alpha2, 2);
 359
 360         mutex_lock(&reg_regdb_search_mutex);
 361         list_add_tail(&request->list, &reg_regdb_search_list);
 362         mutex_unlock(&reg_regdb_search_mutex);
 363
 364         schedule_work(&reg_regdb_work);
 365 }
 366 #else
 367 static inline void reg_regdb_query(const char *alpha2) {}
 368 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
 369
 370 /*
 371  * This lets us keep regulatory code which is updated on a regulatory
 372  * basis in userspace. Country information is filled in by
 373  * reg_device_uevent
 374  */
 375 static int call_crda(const char *alpha2)
 376 {
 377         if (!is_world_regdom((char *) alpha2))
 378                 pr_info("Calling CRDA for country: %c%c\n",
 379                         alpha2[0], alpha2[1]);
 380         else
 381                 pr_info("Calling CRDA to update world regulatory domain\n");
 382
 383         /* query internal regulatory database (if it exists) */
 384         reg_regdb_query(alpha2);
 385
 386         return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
 387 }
 388
 389 /* Used by nl80211 before kmalloc'ing our regulatory domain */
 390 bool reg_is_valid_request(const char *alpha2)
 391 {
 392         assert_cfg80211_lock();
 393
 394         if (!last_request)
 395                 return false;
 396
 397         return alpha2_equal(last_request->alpha2, alpha2);
 398 }
 399
 400 /* Sanity check on a regulatory rule */
 401 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
 402 {
 403         const struct ieee80211_freq_range *freq_range = &rule->freq_range;
 404         u32 freq_diff;
 405
 406         if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
 407                 return false;
 408
 409         if (freq_range->start_freq_khz > freq_range->end_freq_khz)
 410                 return false;
 411
 412         freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 413
 414         if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
 415                         freq_range->max_bandwidth_khz > freq_diff)
 416                 return false;
 417
 418         return true;
 419 }
 420
 421 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
 422 {
 423         const struct ieee80211_reg_rule *reg_rule = NULL;
 424         unsigned int i;
 425
 426         if (!rd->n_reg_rules)
 427                 return false;
 428
 429         if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
 430                 return false;
 431
 432         for (i = 0; i < rd->n_reg_rules; i++) {
 433                 reg_rule = &rd->reg_rules[i];
 434                 if (!is_valid_reg_rule(reg_rule))
 435                         return false;
 436         }
 437
 438         return true;
 439 }
 440
 441 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
 442                             u32 center_freq_khz,
 443                             u32 bw_khz)
 444 {
 445         u32 start_freq_khz, end_freq_khz;
 446
 447         start_freq_khz = center_freq_khz - (bw_khz/2);
 448         end_freq_khz = center_freq_khz + (bw_khz/2);
 449
 450         if (start_freq_khz >= freq_range->start_freq_khz &&
 451             end_freq_khz <= freq_range->end_freq_khz)
 452                 return true;
 453
 454         return false;
 455 }
 456
 457 /**
 458  * freq_in_rule_band - tells us if a frequency is in a frequency band
 459  * @freq_range: frequency rule we want to query
 460  * @freq_khz: frequency we are inquiring about
 461  *
 462  * This lets us know if a specific frequency rule is or is not relevant to
 463  * a specific frequency's band. Bands are device specific and artificial
 464  * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
 465  * safe for now to assume that a frequency rule should not be part of a
 466  * frequency's band if the start freq or end freq are off by more than 2 GHz.
 467  * This resolution can be lowered and should be considered as we add
 468  * regulatory rule support for other "bands".
 469  **/
 470 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
 471         u32 freq_khz)
 472 {
 473 #define ONE_GHZ_IN_KHZ  1000000
 474         if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
 475                 return true;
 476         if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
 477                 return true;
 478         return false;
 479 #undef ONE_GHZ_IN_KHZ
 480 }
 481
 482 /*
 483  * Helper for regdom_intersect(), this does the real
 484  * mathematical intersection fun
 485  */
 486 static int reg_rules_intersect(
 487         const struct ieee80211_reg_rule *rule1,
 488         const struct ieee80211_reg_rule *rule2,
 489         struct ieee80211_reg_rule *intersected_rule)
 490 {
 491         const struct ieee80211_freq_range *freq_range1, *freq_range2;
 492         struct ieee80211_freq_range *freq_range;
 493         const struct ieee80211_power_rule *power_rule1, *power_rule2;
 494         struct ieee80211_power_rule *power_rule;
 495         u32 freq_diff;
 496
 497         freq_range1 = &rule1->freq_range;
 498         freq_range2 = &rule2->freq_range;
 499         freq_range = &intersected_rule->freq_range;
 500
 501         power_rule1 = &rule1->power_rule;
 502         power_rule2 = &rule2->power_rule;
 503         power_rule = &intersected_rule->power_rule;
 504
 505         freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
 506                 freq_range2->start_freq_khz);
 507         freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
 508                 freq_range2->end_freq_khz);
 509         freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
 510                 freq_range2->max_bandwidth_khz);
 511
 512         freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 513         if (freq_range->max_bandwidth_khz > freq_diff)
 514                 freq_range->max_bandwidth_khz = freq_diff;
 515
 516         power_rule->max_eirp = min(power_rule1->max_eirp,
 517                 power_rule2->max_eirp);
 518         power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
 519                 power_rule2->max_antenna_gain);
 520
 521         intersected_rule->flags = (rule1->flags | rule2->flags);
 522
 523         if (!is_valid_reg_rule(intersected_rule))
 524                 return -EINVAL;
 525
 526         return 0;
 527 }
 528
 529 /**
 530  * regdom_intersect - do the intersection between two regulatory domains
 531  * @rd1: first regulatory domain
 532  * @rd2: second regulatory domain
 533  *
 534  * Use this function to get the intersection between two regulatory domains.
 535  * Once completed we will mark the alpha2 for the rd as intersected, "98",
 536  * as no one single alpha2 can represent this regulatory domain.
 537  *
 538  * Returns a pointer to the regulatory domain structure which will hold the
 539  * resulting intersection of rules between rd1 and rd2. We will
 540  * kzalloc() this structure for you.
 541  */
 542 static struct ieee80211_regdomain *regdom_intersect(
 543         const struct ieee80211_regdomain *rd1,
 544         const struct ieee80211_regdomain *rd2)
 545 {
 546         int r, size_of_regd;
 547         unsigned int x, y;
 548         unsigned int num_rules = 0, rule_idx = 0;
 549         const struct ieee80211_reg_rule *rule1, *rule2;
 550         struct ieee80211_reg_rule *intersected_rule;
 551         struct ieee80211_regdomain *rd;
 552         /* This is just a dummy holder to help us count */
 553         struct ieee80211_reg_rule irule;
 554
 555         /* Uses the stack temporarily for counter arithmetic */
 556         intersected_rule = &irule;
 557
 558         memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
 559
 560         if (!rd1 || !rd2)
 561                 return NULL;
 562
 563         /*
 564          * First we get a count of the rules we'll need, then we actually
 565          * build them. This is to so we can malloc() and free() a
 566          * regdomain once. The reason we use reg_rules_intersect() here
 567          * is it will return -EINVAL if the rule computed makes no sense.
 568          * All rules that do check out OK are valid.
 569          */
 570
 571         for (x = 0; x < rd1->n_reg_rules; x++) {
 572                 rule1 = &rd1->reg_rules[x];
 573                 for (y = 0; y < rd2->n_reg_rules; y++) {
 574                         rule2 = &rd2->reg_rules[y];
 575                         if (!reg_rules_intersect(rule1, rule2,
 576                                         intersected_rule))
 577                                 num_rules++;
 578                         memset(intersected_rule, 0,
 579                                         sizeof(struct ieee80211_reg_rule));
 580                 }
 581         }
 582
 583         if (!num_rules)
 584                 return NULL;
 585
 586         size_of_regd = sizeof(struct ieee80211_regdomain) +
 587                 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
 588
 589         rd = kzalloc(size_of_regd, GFP_KERNEL);
 590         if (!rd)
 591                 return NULL;
 592
 593         for (x = 0; x < rd1->n_reg_rules; x++) {
 594                 rule1 = &rd1->reg_rules[x];
 595                 for (y = 0; y < rd2->n_reg_rules; y++) {
 596                         rule2 = &rd2->reg_rules[y];
 597                         /*
 598                          * This time around instead of using the stack lets
 599                          * write to the target rule directly saving ourselves
 600                          * a memcpy()
 601                          */
 602                         intersected_rule = &rd->reg_rules[rule_idx];
 603                         r = reg_rules_intersect(rule1, rule2,
 604                                 intersected_rule);
 605                         /*
 606                          * No need to memset here the intersected rule here as
 607                          * we're not using the stack anymore
 608                          */
 609                         if (r)
 610                                 continue;
 611                         rule_idx++;
 612                 }
 613         }
 614
 615         if (rule_idx != num_rules) {
 616                 kfree(rd);
 617                 return NULL;
 618         }
 619
 620         rd->n_reg_rules = num_rules;
 621         rd->alpha2[0] = '9';
 622         rd->alpha2[1] = '8';
 623
 624         return rd;
 625 }
 626
 627 /*
 628  * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
 629  * want to just have the channel structure use these
 630  */
 631 static u32 map_regdom_flags(u32 rd_flags)
 632 {
 633         u32 channel_flags = 0;
 634         if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
 635                 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 636         if (rd_flags & NL80211_RRF_NO_IBSS)
 637                 channel_flags |= IEEE80211_CHAN_NO_IBSS;
 638         if (rd_flags & NL80211_RRF_DFS)
 639                 channel_flags |= IEEE80211_CHAN_RADAR;
 640         return channel_flags;
 641 }
 642
 643 static int freq_reg_info_regd(struct wiphy *wiphy,
 644                               u32 center_freq,
 645                               u32 desired_bw_khz,
 646                               const struct ieee80211_reg_rule **reg_rule,
 647                               const struct ieee80211_regdomain *custom_regd)
 648 {
 649         int i;
 650         bool band_rule_found = false;
 651         const struct ieee80211_regdomain *regd;
 652         bool bw_fits = false;
 653
 654         if (!desired_bw_khz)
 655                 desired_bw_khz = MHZ_TO_KHZ(20);
 656
 657         regd = custom_regd ? custom_regd : cfg80211_regdomain;
 658
 659         /*
 660          * Follow the driver's regulatory domain, if present, unless a country
 661          * IE has been processed or a user wants to help complaince further
 662          */
 663         if (!custom_regd &&
 664             last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
 665             last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
 666             wiphy->regd)
 667                 regd = wiphy->regd;
 668
 669         if (!regd)
 670                 return -EINVAL;
 671
 672         for (i = 0; i < regd->n_reg_rules; i++) {
 673                 const struct ieee80211_reg_rule *rr;
 674                 const struct ieee80211_freq_range *fr = NULL;
 675
 676                 rr = &regd->reg_rules[i];
 677                 fr = &rr->freq_range;
 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 #ifdef CONFIG_CFG80211_REG_DEBUG
 718 static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
 719 {
 720         switch (initiator) {
 721         case NL80211_REGDOM_SET_BY_CORE:
 722                 return "Set by core";
 723         case NL80211_REGDOM_SET_BY_USER:
 724                 return "Set by user";
 725         case NL80211_REGDOM_SET_BY_DRIVER:
 726                 return "Set by driver";
 727         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 728                 return "Set by country IE";
 729         default:
 730                 WARN_ON(1);
 731                 return "Set by bug";
 732         }
 733 }
 734
 735 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
 736                                     u32 desired_bw_khz,
 737                                     const struct ieee80211_reg_rule *reg_rule)
 738 {
 739         const struct ieee80211_power_rule *power_rule;
 740         const struct ieee80211_freq_range *freq_range;
 741         char max_antenna_gain[32];
 742
 743         power_rule = &reg_rule->power_rule;
 744         freq_range = &reg_rule->freq_range;
 745
 746         if (!power_rule->max_antenna_gain)
 747                 snprintf(max_antenna_gain, 32, "N/A");
 748         else
 749                 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
 750
 751         REG_DBG_PRINT("Updating information on frequency %d MHz "
 752                       "for a %d MHz width channel with regulatory rule:\n",
 753                       chan->center_freq,
 754                       KHZ_TO_MHZ(desired_bw_khz));
 755
 756         REG_DBG_PRINT("%d KHz - %d KHz @  KHz), (%s mBi, %d mBm)\n",
 757                       freq_range->start_freq_khz,
 758                       freq_range->end_freq_khz,
 759                       max_antenna_gain,
 760                       power_rule->max_eirp);
 761 }
 762 #else
 763 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
 764                                     u32 desired_bw_khz,
 765                                     const struct ieee80211_reg_rule *reg_rule)
 766 {
 767         return;
 768 }
 769 #endif
 770
 771 /*
 772  * Note that right now we assume the desired channel bandwidth
 773  * is always 20 MHz for each individual channel (HT40 uses 20 MHz
 774  * per channel, the primary and the extension channel). To support
 775  * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
 776  * new ieee80211_channel.target_bw and re run the regulatory check
 777  * on the wiphy with the target_bw specified. Then we can simply use
 778  * that below for the desired_bw_khz below.
 779  */
 780 static void handle_channel(struct wiphy *wiphy,
 781                            enum nl80211_reg_initiator initiator,
 782                            enum ieee80211_band band,
 783                            unsigned int chan_idx)
 784 {
 785         int r;
 786         u32 flags, bw_flags = 0;
 787         u32 desired_bw_khz = MHZ_TO_KHZ(20);
 788         const struct ieee80211_reg_rule *reg_rule = NULL;
 789         const struct ieee80211_power_rule *power_rule = NULL;
 790         const struct ieee80211_freq_range *freq_range = NULL;
 791         struct ieee80211_supported_band *sband;
 792         struct ieee80211_channel *chan;
 793         struct wiphy *request_wiphy = NULL;
 794
 795         assert_cfg80211_lock();
 796
 797         request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
 798
 799         sband = wiphy->bands[band];
 800         BUG_ON(chan_idx >= sband->n_channels);
 801         chan = &sband->channels[chan_idx];
 802
 803         flags = chan->orig_flags;
 804
 805         r = freq_reg_info(wiphy,
 806                           MHZ_TO_KHZ(chan->center_freq),
 807                           desired_bw_khz,
 808                           &reg_rule);
 809
 810         if (r) {
 811                 /*
 812                  * We will disable all channels that do not match our
 813                  * received regulatory rule unless the hint is coming
 814                  * from a Country IE and the Country IE had no information
 815                  * about a band. The IEEE 802.11 spec allows for an AP
 816                  * to send only a subset of the regulatory rules allowed,
 817                  * so an AP in the US that only supports 2.4 GHz may only send
 818                  * a country IE with information for the 2.4 GHz band
 819                  * while 5 GHz is still supported.
 820                  */
 821                 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
 822                     r == -ERANGE)
 823                         return;
 824
 825                 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
 826                 chan->flags = IEEE80211_CHAN_DISABLED;
 827                 return;
 828         }
 829
 830         chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
 831
 832         power_rule = &reg_rule->power_rule;
 833         freq_range = &reg_rule->freq_range;
 834
 835         if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
 836                 bw_flags = IEEE80211_CHAN_NO_HT40;
 837
 838         if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
 839             request_wiphy && request_wiphy == wiphy &&
 840             request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
 841                 /*
 842                  * This guarantees the driver's requested regulatory domain
 843                  * will always be used as a base for further regulatory
 844                  * settings
 845                  */
 846                 chan->flags = chan->orig_flags =
 847                         map_regdom_flags(reg_rule->flags) | bw_flags;
 848                 chan->max_antenna_gain = chan->orig_mag =
 849                         (int) MBI_TO_DBI(power_rule->max_antenna_gain);
 850                 chan->max_power = chan->orig_mpwr =
 851                         (int) MBM_TO_DBM(power_rule->max_eirp);
 852                 return;
 853         }
 854
 855         chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
 856         chan->max_antenna_gain = min(chan->orig_mag,
 857                 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
 858         if (chan->orig_mpwr)
 859                 chan->max_power = min(chan->orig_mpwr,
 860                         (int) MBM_TO_DBM(power_rule->max_eirp));
 861         else
 862                 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
 863 }
 864
 865 static void handle_band(struct wiphy *wiphy,
 866                         enum ieee80211_band band,
 867                         enum nl80211_reg_initiator initiator)
 868 {
 869         unsigned int i;
 870         struct ieee80211_supported_band *sband;
 871
 872         BUG_ON(!wiphy->bands[band]);
 873         sband = wiphy->bands[band];
 874
 875         for (i = 0; i < sband->n_channels; i++)
 876                 handle_channel(wiphy, initiator, band, i);
 877 }
 878
 879 static bool ignore_reg_update(struct wiphy *wiphy,
 880                               enum nl80211_reg_initiator initiator)
 881 {
 882         if (!last_request) {
 883                 REG_DBG_PRINT("Ignoring regulatory request %s since "
 884                               "last_request is not set\n",
 885                               reg_initiator_name(initiator));
 886                 return true;
 887         }
 888
 889         if (initiator == NL80211_REGDOM_SET_BY_CORE &&
 890             wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 891                 REG_DBG_PRINT("Ignoring regulatory request %s "
 892                               "since the driver uses its own custom "
 893                               "regulatory domain ",
 894                               reg_initiator_name(initiator));
 895                 return true;
 896         }
 897
 898         /*
 899          * wiphy->regd will be set once the device has its own
 900          * desired regulatory domain set
 901          */
 902         if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
 903             initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
 904             !is_world_regdom(last_request->alpha2)) {
 905                 REG_DBG_PRINT("Ignoring regulatory request %s "
 906                               "since the driver requires its own regulatory "
 907                               "domain to be set first",
 908                               reg_initiator_name(initiator));
 909                 return true;
 910         }
 911
 912         return false;
 913 }
 914
 915 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
 916 {
 917         struct cfg80211_registered_device *rdev;
 918
 919         list_for_each_entry(rdev, &cfg80211_rdev_list, list)
 920                 wiphy_update_regulatory(&rdev->wiphy, initiator);
 921 }
 922
 923 static void handle_reg_beacon(struct wiphy *wiphy,
 924                               unsigned int chan_idx,
 925                               struct reg_beacon *reg_beacon)
 926 {
 927         struct ieee80211_supported_band *sband;
 928         struct ieee80211_channel *chan;
 929         bool channel_changed = false;
 930         struct ieee80211_channel chan_before;
 931
 932         assert_cfg80211_lock();
 933
 934         sband = wiphy->bands[reg_beacon->chan.band];
 935         chan = &sband->channels[chan_idx];
 936
 937         if (likely(chan->center_freq != reg_beacon->chan.center_freq))
 938                 return;
 939
 940         if (chan->beacon_found)
 941                 return;
 942
 943         chan->beacon_found = true;
 944
 945         if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
 946                 return;
 947
 948         chan_before.center_freq = chan->center_freq;
 949         chan_before.flags = chan->flags;
 950
 951         if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
 952                 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 953                 channel_changed = true;
 954         }
 955
 956         if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
 957                 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
 958                 channel_changed = true;
 959         }
 960
 961         if (channel_changed)
 962                 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
 963 }
 964
 965 /*
 966  * Called when a scan on a wiphy finds a beacon on
 967  * new channel
 968  */
 969 static void wiphy_update_new_beacon(struct wiphy *wiphy,
 970                                     struct reg_beacon *reg_beacon)
 971 {
 972         unsigned int i;
 973         struct ieee80211_supported_band *sband;
 974
 975         assert_cfg80211_lock();
 976
 977         if (!wiphy->bands[reg_beacon->chan.band])
 978                 return;
 979
 980         sband = wiphy->bands[reg_beacon->chan.band];
 981
 982         for (i = 0; i < sband->n_channels; i++)
 983                 handle_reg_beacon(wiphy, i, reg_beacon);
 984 }
 985
 986 /*
 987  * Called upon reg changes or a new wiphy is added
 988  */
 989 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
 990 {
 991         unsigned int i;
 992         struct ieee80211_supported_band *sband;
 993         struct reg_beacon *reg_beacon;
 994
 995         assert_cfg80211_lock();
 996
 997         if (list_empty(&reg_beacon_list))
 998                 return;
 999
1000         list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1001                 if (!wiphy->bands[reg_beacon->chan.band])
1002                         continue;
1003                 sband = wiphy->bands[reg_beacon->chan.band];
1004                 for (i = 0; i < sband->n_channels; i++)
1005                         handle_reg_beacon(wiphy, i, reg_beacon);
1006         }
1007 }
1008
1009 static bool reg_is_world_roaming(struct wiphy *wiphy)
1010 {
1011         if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1012             (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1013                 return true;
1014         if (last_request &&
1015             last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1016             wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1017                 return true;
1018         return false;
1019 }
1020
1021 /* Reap the advantages of previously found beacons */
1022 static void reg_process_beacons(struct wiphy *wiphy)
1023 {
1024         /*
1025          * Means we are just firing up cfg80211, so no beacons would
1026          * have been processed yet.
1027          */
1028         if (!last_request)
1029                 return;
1030         if (!reg_is_world_roaming(wiphy))
1031                 return;
1032         wiphy_update_beacon_reg(wiphy);
1033 }
1034
1035 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1036 {
1037         if (!chan)
1038                 return true;
1039         if (chan->flags & IEEE80211_CHAN_DISABLED)
1040                 return true;
1041         /* This would happen when regulatory rules disallow HT40 completely */
1042         if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1043                 return true;
1044         return false;
1045 }
1046
1047 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1048                                          enum ieee80211_band band,
1049                                          unsigned int chan_idx)
1050 {
1051         struct ieee80211_supported_band *sband;
1052         struct ieee80211_channel *channel;
1053         struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1054         unsigned int i;
1055
1056         assert_cfg80211_lock();
1057
1058         sband = wiphy->bands[band];
1059         BUG_ON(chan_idx >= sband->n_channels);
1060         channel = &sband->channels[chan_idx];
1061
1062         if (is_ht40_not_allowed(channel)) {
1063                 channel->flags |= IEEE80211_CHAN_NO_HT40;
1064                 return;
1065         }
1066
1067         /*
1068          * We need to ensure the extension channels exist to
1069          * be able to use HT40- or HT40+, this finds them (or not)
1070          */
1071         for (i = 0; i < sband->n_channels; i++) {
1072                 struct ieee80211_channel *c = &sband->channels[i];
1073                 if (c->center_freq == (channel->center_freq - 20))
1074                         channel_before = c;
1075                 if (c->center_freq == (channel->center_freq + 20))
1076                         channel_after = c;
1077         }
1078
1079         /*
1080          * Please note that this assumes target bandwidth is 20 MHz,
1081          * if that ever changes we also need to change the below logic
1082          * to include that as well.
1083          */
1084         if (is_ht40_not_allowed(channel_before))
1085                 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1086         else
1087                 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1088
1089         if (is_ht40_not_allowed(channel_after))
1090                 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1091         else
1092                 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1093 }
1094
1095 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1096                                       enum ieee80211_band band)
1097 {
1098         unsigned int i;
1099         struct ieee80211_supported_band *sband;
1100
1101         BUG_ON(!wiphy->bands[band]);
1102         sband = wiphy->bands[band];
1103
1104         for (i = 0; i < sband->n_channels; i++)
1105                 reg_process_ht_flags_channel(wiphy, band, i);
1106 }
1107
1108 static void reg_process_ht_flags(struct wiphy *wiphy)
1109 {
1110         enum ieee80211_band band;
1111
1112         if (!wiphy)
1113                 return;
1114
1115         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1116                 if (wiphy->bands[band])
1117                         reg_process_ht_flags_band(wiphy, band);
1118         }
1119
1120 }
1121
1122 void wiphy_update_regulatory(struct wiphy *wiphy,
1123                              enum nl80211_reg_initiator initiator)
1124 {
1125         enum ieee80211_band band;
1126
1127         if (ignore_reg_update(wiphy, initiator))
1128                 return;
1129
1130         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1131                 if (wiphy->bands[band])
1132                         handle_band(wiphy, band, initiator);
1133         }
1134
1135         reg_process_beacons(wiphy);
1136         reg_process_ht_flags(wiphy);
1137         if (wiphy->reg_notifier)
1138                 wiphy->reg_notifier(wiphy, last_request);
1139 }
1140
1141 static void handle_channel_custom(struct wiphy *wiphy,
1142                                   enum ieee80211_band band,
1143                                   unsigned int chan_idx,
1144                                   const struct ieee80211_regdomain *regd)
1145 {
1146         int r;
1147         u32 desired_bw_khz = MHZ_TO_KHZ(20);
1148         u32 bw_flags = 0;
1149         const struct ieee80211_reg_rule *reg_rule = NULL;
1150         const struct ieee80211_power_rule *power_rule = NULL;
1151         const struct ieee80211_freq_range *freq_range = NULL;
1152         struct ieee80211_supported_band *sband;
1153         struct ieee80211_channel *chan;
1154
1155         assert_reg_lock();
1156
1157         sband = wiphy->bands[band];
1158         BUG_ON(chan_idx >= sband->n_channels);
1159         chan = &sband->channels[chan_idx];
1160
1161         r = freq_reg_info_regd(wiphy,
1162                                MHZ_TO_KHZ(chan->center_freq),
1163                                desired_bw_khz,
1164                                &reg_rule,
1165                                regd);
1166
1167         if (r) {
1168                 REG_DBG_PRINT("Disabling freq %d MHz as custom "
1169                               "regd has no rule that fits a %d MHz "
1170                               "wide channel\n",
1171                               chan->center_freq,
1172                               KHZ_TO_MHZ(desired_bw_khz));
1173                 chan->flags = IEEE80211_CHAN_DISABLED;
1174                 return;
1175         }
1176
1177         chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1178
1179         power_rule = &reg_rule->power_rule;
1180         freq_range = &reg_rule->freq_range;
1181
1182         if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1183                 bw_flags = IEEE80211_CHAN_NO_HT40;
1184
1185         chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1186         chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1187         chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1188 }
1189
1190 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1191                                const struct ieee80211_regdomain *regd)
1192 {
1193         unsigned int i;
1194         struct ieee80211_supported_band *sband;
1195
1196         BUG_ON(!wiphy->bands[band]);
1197         sband = wiphy->bands[band];
1198
1199         for (i = 0; i < sband->n_channels; i++)
1200                 handle_channel_custom(wiphy, band, i, regd);
1201 }
1202
1203 /* Used by drivers prior to wiphy registration */
1204 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1205                                    const struct ieee80211_regdomain *regd)
1206 {
1207         enum ieee80211_band band;
1208         unsigned int bands_set = 0;
1209
1210         mutex_lock(&reg_mutex);
1211         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1212                 if (!wiphy->bands[band])
1213                         continue;
1214                 handle_band_custom(wiphy, band, regd);
1215                 bands_set++;
1216         }
1217         mutex_unlock(&reg_mutex);
1218
1219         /*
1220          * no point in calling this if it won't have any effect
1221          * on your device's supportd bands.
1222          */
1223         WARN_ON(!bands_set);
1224 }
1225 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1226
1227 /*
1228  * Return value which can be used by ignore_request() to indicate
1229  * it has been determined we should intersect two regulatory domains
1230  */
1231 #define REG_INTERSECT   1
1232
1233 /* This has the logic which determines when a new request
1234  * should be ignored. */
1235 static int ignore_request(struct wiphy *wiphy,
1236                           struct regulatory_request *pending_request)
1237 {
1238         struct wiphy *last_wiphy = NULL;
1239
1240         assert_cfg80211_lock();
1241
1242         /* All initial requests are respected */
1243         if (!last_request)
1244                 return 0;
1245
1246         switch (pending_request->initiator) {
1247         case NL80211_REGDOM_SET_BY_CORE:
1248                 return 0;
1249         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1250
1251                 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1252
1253                 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1254                         return -EINVAL;
1255                 if (last_request->initiator ==
1256                     NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1257                         if (last_wiphy != wiphy) {
1258                                 /*
1259                                  * Two cards with two APs claiming different
1260                                  * Country IE alpha2s. We could
1261                                  * intersect them, but that seems unlikely
1262                                  * to be correct. Reject second one for now.
1263                                  */
1264                                 if (regdom_changes(pending_request->alpha2))
1265                                         return -EOPNOTSUPP;
1266                                 return -EALREADY;
1267                         }
1268                         /*
1269                          * Two consecutive Country IE hints on the same wiphy.
1270                          * This should be picked up early by the driver/stack
1271                          */
1272                         if (WARN_ON(regdom_changes(pending_request->alpha2)))
1273                                 return 0;
1274                         return -EALREADY;
1275                 }
1276                 return 0;
1277         case NL80211_REGDOM_SET_BY_DRIVER:
1278                 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1279                         if (regdom_changes(pending_request->alpha2))
1280                                 return 0;
1281                         return -EALREADY;
1282                 }
1283
1284                 /*
1285                  * This would happen if you unplug and plug your card
1286                  * back in or if you add a new device for which the previously
1287                  * loaded card also agrees on the regulatory domain.
1288                  */
1289                 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1290                     !regdom_changes(pending_request->alpha2))
1291                         return -EALREADY;
1292
1293                 return REG_INTERSECT;
1294         case NL80211_REGDOM_SET_BY_USER:
1295                 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1296                         return REG_INTERSECT;
1297                 /*
1298                  * If the user knows better the user should set the regdom
1299                  * to their country before the IE is picked up
1300                  */
1301                 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1302                           last_request->intersect)
1303                         return -EOPNOTSUPP;
1304                 /*
1305                  * Process user requests only after previous user/driver/core
1306                  * requests have been processed
1307                  */
1308                 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1309                     last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1310                     last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1311                         if (regdom_changes(last_request->alpha2))
1312                                 return -EAGAIN;
1313                 }
1314
1315                 if (!regdom_changes(pending_request->alpha2))
1316                         return -EALREADY;
1317
1318                 return 0;
1319         }
1320
1321         return -EINVAL;
1322 }
1323
1324 static void reg_set_request_processed(void)
1325 {
1326         bool need_more_processing = false;
1327
1328         last_request->processed = true;
1329
1330         spin_lock(&reg_requests_lock);
1331         if (!list_empty(&reg_requests_list))
1332                 need_more_processing = true;
1333         spin_unlock(&reg_requests_lock);
1334
1335         if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
1336                 cancel_delayed_work_sync(&reg_timeout);
1337
1338         if (need_more_processing)
1339                 schedule_work(&reg_work);
1340 }
1341
1342 /**
1343  * __regulatory_hint - hint to the wireless core a regulatory domain
1344  * @wiphy: if the hint comes from country information from an AP, this
1345  *      is required to be set to the wiphy that received the information
1346  * @pending_request: the regulatory request currently being processed
1347  *
1348  * The Wireless subsystem can use this function to hint to the wireless core
1349  * what it believes should be the current regulatory domain.
1350  *
1351  * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1352  * already been set or other standard error codes.
1353  *
1354  * Caller must hold &cfg80211_mutex and &reg_mutex
1355  */
1356 static int __regulatory_hint(struct wiphy *wiphy,
1357                              struct regulatory_request *pending_request)
1358 {
1359         bool intersect = false;
1360         int r = 0;
1361
1362         assert_cfg80211_lock();
1363
1364         r = ignore_request(wiphy, pending_request);
1365
1366         if (r == REG_INTERSECT) {
1367                 if (pending_request->initiator ==
1368                     NL80211_REGDOM_SET_BY_DRIVER) {
1369                         r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1370                         if (r) {
1371                                 kfree(pending_request);
1372                                 return r;
1373                         }
1374                 }
1375                 intersect = true;
1376         } else if (r) {
1377                 /*
1378                  * If the regulatory domain being requested by the
1379                  * driver has already been set just copy it to the
1380                  * wiphy
1381                  */
1382                 if (r == -EALREADY &&
1383                     pending_request->initiator ==
1384                     NL80211_REGDOM_SET_BY_DRIVER) {
1385                         r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1386                         if (r) {
1387                                 kfree(pending_request);
1388                                 return r;
1389                         }
1390                         r = -EALREADY;
1391                         goto new_request;
1392                 }
1393                 kfree(pending_request);
1394                 return r;
1395         }
1396
1397 new_request:
1398         kfree(last_request);
1399
1400         last_request = pending_request;
1401         last_request->intersect = intersect;
1402
1403         pending_request = NULL;
1404
1405         if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1406                 user_alpha2[0] = last_request->alpha2[0];
1407                 user_alpha2[1] = last_request->alpha2[1];
1408         }
1409
1410         /* When r == REG_INTERSECT we do need to call CRDA */
1411         if (r < 0) {
1412                 /*
1413                  * Since CRDA will not be called in this case as we already
1414                  * have applied the requested regulatory domain before we just
1415                  * inform userspace we have processed the request
1416                  */
1417                 if (r == -EALREADY) {
1418                         nl80211_send_reg_change_event(last_request);
1419                         reg_set_request_processed();
1420                 }
1421                 return r;
1422         }
1423
1424         return call_crda(last_request->alpha2);
1425 }
1426
1427 /* This processes *all* regulatory hints */
1428 static void reg_process_hint(struct regulatory_request *reg_request)
1429 {
1430         int r = 0;
1431         struct wiphy *wiphy = NULL;
1432         enum nl80211_reg_initiator initiator = reg_request->initiator;
1433
1434         BUG_ON(!reg_request->alpha2);
1435
1436         if (wiphy_idx_valid(reg_request->wiphy_idx))
1437                 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1438
1439         if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1440             !wiphy) {
1441                 kfree(reg_request);
1442                 return;
1443         }
1444
1445         r = __regulatory_hint(wiphy, reg_request);
1446         /* This is required so that the orig_* parameters are saved */
1447         if (r == -EALREADY && wiphy &&
1448             wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
1449                 wiphy_update_regulatory(wiphy, initiator);
1450                 return;
1451         }
1452
1453         /*
1454          * We only time out user hints, given that they should be the only
1455          * source of bogus requests.
1456          */
1457         if (r != -EALREADY &&
1458             reg_request->initiator == NL80211_REGDOM_SET_BY_USER)
1459                 schedule_delayed_work(&reg_timeout, msecs_to_jiffies(3142));
1460 }
1461
1462 /*
1463  * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1464  * Regulatory hints come on a first come first serve basis and we
1465  * must process each one atomically.
1466  */
1467 static void reg_process_pending_hints(void)
1468 {
1469         struct regulatory_request *reg_request;
1470
1471         mutex_lock(&cfg80211_mutex);
1472         mutex_lock(&reg_mutex);
1473
1474         /* When last_request->processed becomes true this will be rescheduled */
1475         if (last_request && !last_request->processed) {
1476                 REG_DBG_PRINT("Pending regulatory request, waiting "
1477                               "for it to be processed...");
1478                 goto out;
1479         }
1480
1481         spin_lock(&reg_requests_lock);
1482
1483         if (list_empty(&reg_requests_list)) {
1484                 spin_unlock(&reg_requests_lock);
1485                 goto out;
1486         }
1487
1488         reg_request = list_first_entry(&reg_requests_list,
1489                                        struct regulatory_request,
1490                                        list);
1491         list_del_init(&reg_request->list);
1492
1493         spin_unlock(&reg_requests_lock);
1494
1495         reg_process_hint(reg_request);
1496
1497 out:
1498         mutex_unlock(&reg_mutex);
1499         mutex_unlock(&cfg80211_mutex);
1500 }
1501
1502 /* Processes beacon hints -- this has nothing to do with country IEs */
1503 static void reg_process_pending_beacon_hints(void)
1504 {
1505         struct cfg80211_registered_device *rdev;
1506         struct reg_beacon *pending_beacon, *tmp;
1507
1508         /*
1509          * No need to hold the reg_mutex here as we just touch wiphys
1510          * and do not read or access regulatory variables.
1511          */
1512         mutex_lock(&cfg80211_mutex);
1513
1514         /* This goes through the _pending_ beacon list */
1515         spin_lock_bh(&reg_pending_beacons_lock);
1516
1517         if (list_empty(&reg_pending_beacons)) {
1518                 spin_unlock_bh(&reg_pending_beacons_lock);
1519                 goto out;
1520         }
1521
1522         list_for_each_entry_safe(pending_beacon, tmp,
1523                                  &reg_pending_beacons, list) {
1524
1525                 list_del_init(&pending_beacon->list);
1526
1527                 /* Applies the beacon hint to current wiphys */
1528                 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1529                         wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1530
1531                 /* Remembers the beacon hint for new wiphys or reg changes */
1532                 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1533         }
1534
1535         spin_unlock_bh(&reg_pending_beacons_lock);
1536 out:
1537         mutex_unlock(&cfg80211_mutex);
1538 }
1539
1540 static void reg_todo(struct work_struct *work)
1541 {
1542         reg_process_pending_hints();
1543         reg_process_pending_beacon_hints();
1544 }
1545
1546 static void queue_regulatory_request(struct regulatory_request *request)
1547 {
1548         if (isalpha(request->alpha2[0]))
1549                 request->alpha2[0] = toupper(request->alpha2[0]);
1550         if (isalpha(request->alpha2[1]))
1551                 request->alpha2[1] = toupper(request->alpha2[1]);
1552
1553         spin_lock(&reg_requests_lock);
1554         list_add_tail(&request->list, &reg_requests_list);
1555         spin_unlock(&reg_requests_lock);
1556
1557         schedule_work(&reg_work);
1558 }
1559
1560 /*
1561  * Core regulatory hint -- happens during cfg80211_init()
1562  * and when we restore regulatory settings.
1563  */
1564 static int regulatory_hint_core(const char *alpha2)
1565 {
1566         struct regulatory_request *request;
1567
1568         kfree(last_request);
1569         last_request = NULL;
1570
1571         request = kzalloc(sizeof(struct regulatory_request),
1572                           GFP_KERNEL);
1573         if (!request)
1574                 return -ENOMEM;
1575
1576         request->alpha2[0] = alpha2[0];
1577         request->alpha2[1] = alpha2[1];
1578         request->initiator = NL80211_REGDOM_SET_BY_CORE;
1579
1580         queue_regulatory_request(request);
1581
1582         return 0;
1583 }
1584
1585 /* User hints */
1586 int regulatory_hint_user(const char *alpha2)
1587 {
1588         struct regulatory_request *request;
1589
1590         BUG_ON(!alpha2);
1591
1592         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1593         if (!request)
1594                 return -ENOMEM;
1595
1596         request->wiphy_idx = WIPHY_IDX_STALE;
1597         request->alpha2[0] = alpha2[0];
1598         request->alpha2[1] = alpha2[1];
1599         request->initiator = NL80211_REGDOM_SET_BY_USER;
1600
1601         queue_regulatory_request(request);
1602
1603         return 0;
1604 }
1605
1606 /* Driver hints */
1607 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1608 {
1609         struct regulatory_request *request;
1610
1611         BUG_ON(!alpha2);
1612         BUG_ON(!wiphy);
1613
1614         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1615         if (!request)
1616                 return -ENOMEM;
1617
1618         request->wiphy_idx = get_wiphy_idx(wiphy);
1619
1620         /* Must have registered wiphy first */
1621         BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1622
1623         request->alpha2[0] = alpha2[0];
1624         request->alpha2[1] = alpha2[1];
1625         request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1626
1627         queue_regulatory_request(request);
1628
1629         return 0;
1630 }
1631 EXPORT_SYMBOL(regulatory_hint);
1632
1633 /*
1634  * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1635  * therefore cannot iterate over the rdev list here.
1636  */
1637 void regulatory_hint_11d(struct wiphy *wiphy,
1638                          enum ieee80211_band band,
1639                          u8 *country_ie,
1640                          u8 country_ie_len)
1641 {
1642         char alpha2[2];
1643         enum environment_cap env = ENVIRON_ANY;
1644         struct regulatory_request *request;
1645
1646         mutex_lock(&reg_mutex);
1647
1648         if (unlikely(!last_request))
1649                 goto out;
1650
1651         /* IE len must be evenly divisible by 2 */
1652         if (country_ie_len & 0x01)
1653                 goto out;
1654
1655         if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1656                 goto out;
1657
1658         alpha2[0] = country_ie[0];
1659         alpha2[1] = country_ie[1];
1660
1661         if (country_ie[2] == 'I')
1662                 env = ENVIRON_INDOOR;
1663         else if (country_ie[2] == 'O')
1664                 env = ENVIRON_OUTDOOR;
1665
1666         /*
1667          * We will run this only upon a successful connection on cfg80211.
1668          * We leave conflict resolution to the workqueue, where can hold
1669          * cfg80211_mutex.
1670          */
1671         if (likely(last_request->initiator ==
1672             NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1673             wiphy_idx_valid(last_request->wiphy_idx)))
1674                 goto out;
1675
1676         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1677         if (!request)
1678                 goto out;
1679
1680         request->wiphy_idx = get_wiphy_idx(wiphy);
1681         request->alpha2[0] = alpha2[0];
1682         request->alpha2[1] = alpha2[1];
1683         request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1684         request->country_ie_env = env;
1685
1686         mutex_unlock(&reg_mutex);
1687
1688         queue_regulatory_request(request);
1689
1690         return;
1691
1692 out:
1693         mutex_unlock(&reg_mutex);
1694 }
1695
1696 static void restore_alpha2(char *alpha2, bool reset_user)
1697 {
1698         /* indicates there is no alpha2 to consider for restoration */
1699         alpha2[0] = '9';
1700         alpha2[1] = '7';
1701
1702         /* The user setting has precedence over the module parameter */
1703         if (is_user_regdom_saved()) {
1704                 /* Unless we're asked to ignore it and reset it */
1705                 if (reset_user) {
1706                         REG_DBG_PRINT("Restoring regulatory settings "
1707                                "including user preference\n");
1708                         user_alpha2[0] = '9';
1709                         user_alpha2[1] = '7';
1710
1711                         /*
1712                          * If we're ignoring user settings, we still need to
1713                          * check the module parameter to ensure we put things
1714                          * back as they were for a full restore.
1715                          */
1716                         if (!is_world_regdom(ieee80211_regdom)) {
1717                                 REG_DBG_PRINT("Keeping preference on "
1718                                        "module parameter ieee80211_regdom: %c%c\n",
1719                                        ieee80211_regdom[0],
1720                                        ieee80211_regdom[1]);
1721                                 alpha2[0] = ieee80211_regdom[0];
1722                                 alpha2[1] = ieee80211_regdom[1];
1723                         }
1724                 } else {
1725                         REG_DBG_PRINT("Restoring regulatory settings "
1726                                "while preserving user preference for: %c%c\n",
1727                                user_alpha2[0],
1728                                user_alpha2[1]);
1729                         alpha2[0] = user_alpha2[0];
1730                         alpha2[1] = user_alpha2[1];
1731                 }
1732         } else if (!is_world_regdom(ieee80211_regdom)) {
1733                 REG_DBG_PRINT("Keeping preference on "
1734                        "module parameter ieee80211_regdom: %c%c\n",
1735                        ieee80211_regdom[0],
1736                        ieee80211_regdom[1]);
1737                 alpha2[0] = ieee80211_regdom[0];
1738                 alpha2[1] = ieee80211_regdom[1];
1739         } else
1740                 REG_DBG_PRINT("Restoring regulatory settings\n");
1741 }
1742
1743 /*
1744  * Restoring regulatory settings involves ingoring any
1745  * possibly stale country IE information and user regulatory
1746  * settings if so desired, this includes any beacon hints
1747  * learned as we could have traveled outside to another country
1748  * after disconnection. To restore regulatory settings we do
1749  * exactly what we did at bootup:
1750  *
1751  *   - send a core regulatory hint
1752  *   - send a user regulatory hint if applicable
1753  *
1754  * Device drivers that send a regulatory hint for a specific country
1755  * keep their own regulatory domain on wiphy->regd so that does does
1756  * not need to be remembered.
1757  */
1758 static void restore_regulatory_settings(bool reset_user)
1759 {
1760         char alpha2[2];
1761         struct reg_beacon *reg_beacon, *btmp;
1762         struct regulatory_request *reg_request, *tmp;
1763         LIST_HEAD(tmp_reg_req_list);
1764
1765         mutex_lock(&cfg80211_mutex);
1766         mutex_lock(&reg_mutex);
1767
1768         reset_regdomains();
1769         restore_alpha2(alpha2, reset_user);
1770
1771         /*
1772          * If there's any pending requests we simply
1773          * stash them to a temporary pending queue and
1774          * add then after we've restored regulatory
1775          * settings.
1776          */
1777         spin_lock(&reg_requests_lock);
1778         if (!list_empty(&reg_requests_list)) {
1779                 list_for_each_entry_safe(reg_request, tmp,
1780                                          &reg_requests_list, list) {
1781                         if (reg_request->initiator !=
1782                             NL80211_REGDOM_SET_BY_USER)
1783                                 continue;
1784                         list_del(&reg_request->list);
1785                         list_add_tail(&reg_request->list, &tmp_reg_req_list);
1786                 }
1787         }
1788         spin_unlock(&reg_requests_lock);
1789
1790         /* Clear beacon hints */
1791         spin_lock_bh(&reg_pending_beacons_lock);
1792         if (!list_empty(&reg_pending_beacons)) {
1793                 list_for_each_entry_safe(reg_beacon, btmp,
1794                                          &reg_pending_beacons, list) {
1795                         list_del(&reg_beacon->list);
1796                         kfree(reg_beacon);
1797                 }
1798         }
1799         spin_unlock_bh(&reg_pending_beacons_lock);
1800
1801         if (!list_empty(&reg_beacon_list)) {
1802                 list_for_each_entry_safe(reg_beacon, btmp,
1803                                          &reg_beacon_list, list) {
1804                         list_del(&reg_beacon->list);
1805                         kfree(reg_beacon);
1806                 }
1807         }
1808
1809         /* First restore to the basic regulatory settings */
1810         cfg80211_regdomain = cfg80211_world_regdom;
1811
1812         mutex_unlock(&reg_mutex);
1813         mutex_unlock(&cfg80211_mutex);
1814
1815         regulatory_hint_core(cfg80211_regdomain->alpha2);
1816
1817         /*
1818          * This restores the ieee80211_regdom module parameter
1819          * preference or the last user requested regulatory
1820          * settings, user regulatory settings takes precedence.
1821          */
1822         if (is_an_alpha2(alpha2))
1823                 regulatory_hint_user(user_alpha2);
1824
1825         if (list_empty(&tmp_reg_req_list))
1826                 return;
1827
1828         mutex_lock(&cfg80211_mutex);
1829         mutex_lock(&reg_mutex);
1830
1831         spin_lock(&reg_requests_lock);
1832         list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) {
1833                 REG_DBG_PRINT("Adding request for country %c%c back "
1834                               "into the queue\n",
1835                               reg_request->alpha2[0],
1836                               reg_request->alpha2[1]);
1837                 list_del(&reg_request->list);
1838                 list_add_tail(&reg_request->list, &reg_requests_list);
1839         }
1840         spin_unlock(&reg_requests_lock);
1841
1842         mutex_unlock(&reg_mutex);
1843         mutex_unlock(&cfg80211_mutex);
1844
1845         REG_DBG_PRINT("Kicking the queue\n");
1846
1847         schedule_work(&reg_work);
1848 }
1849
1850 void regulatory_hint_disconnect(void)
1851 {
1852         REG_DBG_PRINT("All devices are disconnected, going to "
1853                       "restore regulatory settings\n");
1854         restore_regulatory_settings(false);
1855 }
1856
1857 static bool freq_is_chan_12_13_14(u16 freq)
1858 {
1859         if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
1860             freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
1861             freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
1862                 return true;
1863         return false;
1864 }
1865
1866 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1867                                  struct ieee80211_channel *beacon_chan,
1868                                  gfp_t gfp)
1869 {
1870         struct reg_beacon *reg_beacon;
1871
1872         if (likely((beacon_chan->beacon_found ||
1873             (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1874             (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1875              !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1876                 return 0;
1877
1878         reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1879         if (!reg_beacon)
1880                 return -ENOMEM;
1881
1882         REG_DBG_PRINT("Found new beacon on "
1883                       "frequency: %d MHz (Ch %d) on %s\n",
1884                       beacon_chan->center_freq,
1885                       ieee80211_frequency_to_channel(beacon_chan->center_freq),
1886                       wiphy_name(wiphy));
1887
1888         memcpy(&reg_beacon->chan, beacon_chan,
1889                 sizeof(struct ieee80211_channel));
1890
1891
1892         /*
1893          * Since we can be called from BH or and non-BH context
1894          * we must use spin_lock_bh()
1895          */
1896         spin_lock_bh(&reg_pending_beacons_lock);
1897         list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1898         spin_unlock_bh(&reg_pending_beacons_lock);
1899
1900         schedule_work(&reg_work);
1901
1902         return 0;
1903 }
1904
1905 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1906 {
1907         unsigned int i;
1908         const struct ieee80211_reg_rule *reg_rule = NULL;
1909         const struct ieee80211_freq_range *freq_range = NULL;
1910         const struct ieee80211_power_rule *power_rule = NULL;
1911
1912         pr_info("    (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
1913
1914         for (i = 0; i < rd->n_reg_rules; i++) {
1915                 reg_rule = &rd->reg_rules[i];
1916                 freq_range = &reg_rule->freq_range;
1917                 power_rule = &reg_rule->power_rule;
1918
1919                 /*
1920                  * There may not be documentation for max antenna gain
1921                  * in certain regions
1922                  */
1923                 if (power_rule->max_antenna_gain)
1924                         pr_info("    (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
1925                                 freq_range->start_freq_khz,
1926                                 freq_range->end_freq_khz,
1927                                 freq_range->max_bandwidth_khz,
1928                                 power_rule->max_antenna_gain,
1929                                 power_rule->max_eirp);
1930                 else
1931                         pr_info("    (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
1932                                 freq_range->start_freq_khz,
1933                                 freq_range->end_freq_khz,
1934                                 freq_range->max_bandwidth_khz,
1935                                 power_rule->max_eirp);
1936         }
1937 }
1938
1939 static void print_regdomain(const struct ieee80211_regdomain *rd)
1940 {
1941
1942         if (is_intersected_alpha2(rd->alpha2)) {
1943
1944                 if (last_request->initiator ==
1945                     NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1946                         struct cfg80211_registered_device *rdev;
1947                         rdev = cfg80211_rdev_by_wiphy_idx(
1948                                 last_request->wiphy_idx);
1949                         if (rdev) {
1950                                 pr_info("Current regulatory domain updated by AP to: %c%c\n",
1951                                         rdev->country_ie_alpha2[0],
1952                                         rdev->country_ie_alpha2[1]);
1953                         } else
1954                                 pr_info("Current regulatory domain intersected:\n");
1955                 } else
1956                         pr_info("Current regulatory domain intersected:\n");
1957         } else if (is_world_regdom(rd->alpha2))
1958                 pr_info("World regulatory domain updated:\n");
1959         else {
1960                 if (is_unknown_alpha2(rd->alpha2))
1961                         pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
1962                 else
1963                         pr_info("Regulatory domain changed to country: %c%c\n",
1964                                 rd->alpha2[0], rd->alpha2[1]);
1965         }
1966         print_rd_rules(rd);
1967 }
1968
1969 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1970 {
1971         pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
1972         print_rd_rules(rd);
1973 }
1974
1975 /* Takes ownership of rd only if it doesn't fail */
1976 static int __set_regdom(const struct ieee80211_regdomain *rd)
1977 {
1978         const struct ieee80211_regdomain *intersected_rd = NULL;
1979         struct cfg80211_registered_device *rdev = NULL;
1980         struct wiphy *request_wiphy;
1981         /* Some basic sanity checks first */
1982
1983         if (is_world_regdom(rd->alpha2)) {
1984                 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1985                         return -EINVAL;
1986                 update_world_regdomain(rd);
1987                 return 0;
1988         }
1989
1990         if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1991                         !is_unknown_alpha2(rd->alpha2))
1992                 return -EINVAL;
1993
1994         if (!last_request)
1995                 return -EINVAL;
1996
1997         /*
1998          * Lets only bother proceeding on the same alpha2 if the current
1999          * rd is non static (it means CRDA was present and was used last)
2000          * and the pending request came in from a country IE
2001          */
2002         if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2003                 /*
2004                  * If someone else asked us to change the rd lets only bother
2005                  * checking if the alpha2 changes if CRDA was already called
2006                  */
2007                 if (!regdom_changes(rd->alpha2))
2008                         return -EINVAL;
2009         }
2010
2011         /*
2012          * Now lets set the regulatory domain, update all driver channels
2013          * and finally inform them of what we have done, in case they want
2014          * to review or adjust their own settings based on their own
2015          * internal EEPROM data
2016          */
2017
2018         if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2019                 return -EINVAL;
2020
2021         if (!is_valid_rd(rd)) {
2022                 pr_err("Invalid regulatory domain detected:\n");
2023                 print_regdomain_info(rd);
2024                 return -EINVAL;
2025         }
2026
2027         request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2028
2029         if (!last_request->intersect) {
2030                 int r;
2031
2032                 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
2033                         reset_regdomains();
2034                         cfg80211_regdomain = rd;
2035                         return 0;
2036                 }
2037
2038                 /*
2039                  * For a driver hint, lets copy the regulatory domain the
2040                  * driver wanted to the wiphy to deal with conflicts
2041                  */
2042
2043                 /*
2044                  * Userspace could have sent two replies with only
2045                  * one kernel request.
2046                  */
2047                 if (request_wiphy->regd)
2048                         return -EALREADY;
2049
2050                 r = reg_copy_regd(&request_wiphy->regd, rd);
2051                 if (r)
2052                         return r;
2053
2054                 reset_regdomains();
2055                 cfg80211_regdomain = rd;
2056                 return 0;
2057         }
2058
2059         /* Intersection requires a bit more work */
2060
2061         if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2062
2063                 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2064                 if (!intersected_rd)
2065                         return -EINVAL;
2066
2067                 /*
2068                  * We can trash what CRDA provided now.
2069                  * However if a driver requested this specific regulatory
2070                  * domain we keep it for its private use
2071                  */
2072                 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
2073                         request_wiphy->regd = rd;
2074                 else
2075                         kfree(rd);
2076
2077                 rd = NULL;
2078
2079                 reset_regdomains();
2080                 cfg80211_regdomain = intersected_rd;
2081
2082                 return 0;
2083         }
2084
2085         if (!intersected_rd)
2086                 return -EINVAL;
2087
2088         rdev = wiphy_to_dev(request_wiphy);
2089
2090         rdev->country_ie_alpha2[0] = rd->alpha2[0];
2091         rdev->country_ie_alpha2[1] = rd->alpha2[1];
2092         rdev->env = last_request->country_ie_env;
2093
2094         BUG_ON(intersected_rd == rd);
2095
2096         kfree(rd);
2097         rd = NULL;
2098
2099         reset_regdomains();
2100         cfg80211_regdomain = intersected_rd;
2101
2102         return 0;
2103 }
2104
2105
2106 /*
2107  * Use this call to set the current regulatory domain. Conflicts with
2108  * multiple drivers can be ironed out later. Caller must've already
2109  * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2110  */
2111 int set_regdom(const struct ieee80211_regdomain *rd)
2112 {
2113         int r;
2114
2115         assert_cfg80211_lock();
2116
2117         mutex_lock(&reg_mutex);
2118
2119         /* Note that this doesn't update the wiphys, this is done below */
2120         r = __set_regdom(rd);
2121         if (r) {
2122                 kfree(rd);
2123                 mutex_unlock(&reg_mutex);
2124                 return r;
2125         }
2126
2127         /* This would make this whole thing pointless */
2128         if (!last_request->intersect)
2129                 BUG_ON(rd != cfg80211_regdomain);
2130
2131         /* update all wiphys now with the new established regulatory domain */
2132         update_all_wiphy_regulatory(last_request->initiator);
2133
2134         print_regdomain(cfg80211_regdomain);
2135
2136         nl80211_send_reg_change_event(last_request);
2137
2138         reg_set_request_processed();
2139
2140         mutex_unlock(&reg_mutex);
2141
2142         return r;
2143 }
2144
2145 #ifdef CONFIG_HOTPLUG
2146 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2147 {
2148         if (last_request && !last_request->processed) {
2149                 if (add_uevent_var(env, "COUNTRY=%c%c",
2150                                    last_request->alpha2[0],
2151                                    last_request->alpha2[1]))
2152                         return -ENOMEM;
2153         }
2154
2155         return 0;
2156 }
2157 #else
2158 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2159 {
2160         return -ENODEV;
2161 }
2162 #endif /* CONFIG_HOTPLUG */
2163
2164 /* Caller must hold cfg80211_mutex */
2165 void reg_device_remove(struct wiphy *wiphy)
2166 {
2167         struct wiphy *request_wiphy = NULL;
2168
2169         assert_cfg80211_lock();
2170
2171         mutex_lock(&reg_mutex);
2172
2173         kfree(wiphy->regd);
2174
2175         if (last_request)
2176                 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2177
2178         if (!request_wiphy || request_wiphy != wiphy)
2179                 goto out;
2180
2181         last_request->wiphy_idx = WIPHY_IDX_STALE;
2182         last_request->country_ie_env = ENVIRON_ANY;
2183 out:
2184         mutex_unlock(&reg_mutex);
2185 }
2186
2187 static void reg_timeout_work(struct work_struct *work)
2188 {
2189         REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "
2190                       "restoring regulatory settings");
2191         restore_regulatory_settings(true);
2192 }
2193
2194 int __init regulatory_init(void)
2195 {
2196         int err = 0;
2197
2198         reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2199         if (IS_ERR(reg_pdev))
2200                 return PTR_ERR(reg_pdev);
2201
2202         reg_pdev->dev.type = &reg_device_type;
2203
2204         spin_lock_init(&reg_requests_lock);
2205         spin_lock_init(&reg_pending_beacons_lock);
2206
2207         cfg80211_regdomain = cfg80211_world_regdom;
2208
2209         user_alpha2[0] = '9';
2210         user_alpha2[1] = '7';
2211
2212         /* We always try to get an update for the static regdomain */
2213         err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2214         if (err) {
2215                 if (err == -ENOMEM)
2216                         return err;
2217                 /*
2218                  * N.B. kobject_uevent_env() can fail mainly for when we're out
2219                  * memory which is handled and propagated appropriately above
2220                  * but it can also fail during a netlink_broadcast() or during
2221                  * early boot for call_usermodehelper(). For now treat these
2222                  * errors as non-fatal.
2223                  */
2224                 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2225 #ifdef CONFIG_CFG80211_REG_DEBUG
2226                 /* We want to find out exactly why when debugging */
2227                 WARN_ON(err);
2228 #endif
2229         }
2230
2231         /*
2232          * Finally, if the user set the module parameter treat it
2233          * as a user hint.
2234          */
2235         if (!is_world_regdom(ieee80211_regdom))
2236                 regulatory_hint_user(ieee80211_regdom);
2237
2238         return 0;
2239 }
2240
2241 void /* __init_or_exit */ regulatory_exit(void)
2242 {
2243         struct regulatory_request *reg_request, *tmp;
2244         struct reg_beacon *reg_beacon, *btmp;
2245
2246         cancel_work_sync(&reg_work);
2247         cancel_delayed_work_sync(&reg_timeout);
2248
2249         mutex_lock(&cfg80211_mutex);
2250         mutex_lock(&reg_mutex);
2251
2252         reset_regdomains();
2253
2254         kfree(last_request);
2255
2256         platform_device_unregister(reg_pdev);
2257
2258         spin_lock_bh(&reg_pending_beacons_lock);
2259         if (!list_empty(&reg_pending_beacons)) {
2260                 list_for_each_entry_safe(reg_beacon, btmp,
2261                                          &reg_pending_beacons, list) {
2262                         list_del(&reg_beacon->list);
2263                         kfree(reg_beacon);
2264                 }
2265         }
2266         spin_unlock_bh(&reg_pending_beacons_lock);
2267
2268         if (!list_empty(&reg_beacon_list)) {
2269                 list_for_each_entry_safe(reg_beacon, btmp,
2270                                          &reg_beacon_list, list) {
2271                         list_del(&reg_beacon->list);
2272                         kfree(reg_beacon);
2273                 }
2274         }
2275
2276         spin_lock(&reg_requests_lock);
2277         if (!list_empty(&reg_requests_list)) {
2278                 list_for_each_entry_safe(reg_request, tmp,
2279                                          &reg_requests_list, list) {
2280                         list_del(&reg_request->list);
2281                         kfree(reg_request);
2282                 }
2283         }
2284         spin_unlock(&reg_requests_lock);
2285
2286         mutex_unlock(&reg_mutex);
2287         mutex_unlock(&cfg80211_mutex);
2288 }