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 static struct regulatory_request core_request_world = {
  61         .initiator = NL80211_REGDOM_SET_BY_CORE,
  62         .alpha2[0] = '0',
  63         .alpha2[1] = '0',
  64         .intersect = false,
  65         .processed = true,
  66         .country_ie_env = ENVIRON_ANY,
  67 };
  68
  69 /* Receipt of information from last regulatory request */
  70 static struct regulatory_request *last_request = &core_request_world;
  71
  72 /* To trigger userspace events */
  73 static struct platform_device *reg_pdev;
  74
  75 static struct device_type reg_device_type = {
  76         .uevent = reg_device_uevent,
  77 };
  78
  79 /*
  80  * Central wireless core regulatory domains, we only need two,
  81  * the current one and a world regulatory domain in case we have no
  82  * information to give us an alpha2
  83  */
  84 const struct ieee80211_regdomain *cfg80211_regdomain;
  85
  86 /*
  87  * Protects static reg.c components:
  88  *     - cfg80211_world_regdom
  89  *     - cfg80211_regdom
  90  *     - last_request
  91  */
  92 static DEFINE_MUTEX(reg_mutex);
  93
  94 static inline void assert_reg_lock(void)
  95 {
  96         lockdep_assert_held(&reg_mutex);
  97 }
  98
  99 /* Used to queue up regulatory hints */
 100 static LIST_HEAD(reg_requests_list);
 101 static spinlock_t reg_requests_lock;
 102
 103 /* Used to queue up beacon hints for review */
 104 static LIST_HEAD(reg_pending_beacons);
 105 static spinlock_t reg_pending_beacons_lock;
 106
 107 /* Used to keep track of processed beacon hints */
 108 static LIST_HEAD(reg_beacon_list);
 109
 110 struct reg_beacon {
 111         struct list_head list;
 112         struct ieee80211_channel chan;
 113 };
 114
 115 static void reg_todo(struct work_struct *work);
 116 static DECLARE_WORK(reg_work, reg_todo);
 117
 118 static void reg_timeout_work(struct work_struct *work);
 119 static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
 120
 121 /* We keep a static world regulatory domain in case of the absence of CRDA */
 122 static const struct ieee80211_regdomain world_regdom = {
 123         .n_reg_rules = 5,
 124         .alpha2 =  "00",
 125         .reg_rules = {
 126                 /* IEEE 802.11b/g, channels 1..11 */
 127                 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
 128                 /* IEEE 802.11b/g, channels 12..13. No HT40
 129                  * channel fits here. */
 130                 REG_RULE(2467-10, 2472+10, 20, 6, 20,
 131                         NL80211_RRF_PASSIVE_SCAN |
 132                         NL80211_RRF_NO_IBSS),
 133                 /* IEEE 802.11 channel 14 - Only JP enables
 134                  * this and for 802.11b only */
 135                 REG_RULE(2484-10, 2484+10, 20, 6, 20,
 136                         NL80211_RRF_PASSIVE_SCAN |
 137                         NL80211_RRF_NO_IBSS |
 138                         NL80211_RRF_NO_OFDM),
 139                 /* IEEE 802.11a, channel 36..48 */
 140                 REG_RULE(5180-10, 5240+10, 40, 6, 20,
 141                         NL80211_RRF_PASSIVE_SCAN |
 142                         NL80211_RRF_NO_IBSS),
 143
 144                 /* NB: 5260 MHz - 5700 MHz requies DFS */
 145
 146                 /* IEEE 802.11a, channel 149..165 */
 147                 REG_RULE(5745-10, 5825+10, 40, 6, 20,
 148                         NL80211_RRF_PASSIVE_SCAN |
 149                         NL80211_RRF_NO_IBSS),
 150         }
 151 };
 152
 153 static const struct ieee80211_regdomain *cfg80211_world_regdom =
 154         &world_regdom;
 155
 156 static char *ieee80211_regdom = "00";
 157 static char user_alpha2[2];
 158
 159 module_param(ieee80211_regdom, charp, 0444);
 160 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
 161
 162 static void reset_regdomains(bool full_reset)
 163 {
 164         /* avoid freeing static information or freeing something twice */
 165         if (cfg80211_regdomain == cfg80211_world_regdom)
 166                 cfg80211_regdomain = NULL;
 167         if (cfg80211_world_regdom == &world_regdom)
 168                 cfg80211_world_regdom = NULL;
 169         if (cfg80211_regdomain == &world_regdom)
 170                 cfg80211_regdomain = NULL;
 171
 172         kfree(cfg80211_regdomain);
 173         kfree(cfg80211_world_regdom);
 174
 175         cfg80211_world_regdom = &world_regdom;
 176         cfg80211_regdomain = NULL;
 177
 178         if (!full_reset)
 179                 return;
 180
 181         if (last_request != &core_request_world)
 182                 kfree(last_request);
 183         last_request = &core_request_world;
 184 }
 185
 186 /*
 187  * Dynamic world regulatory domain requested by the wireless
 188  * core upon initialization
 189  */
 190 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
 191 {
 192         BUG_ON(!last_request);
 193
 194         reset_regdomains(false);
 195
 196         cfg80211_world_regdom = rd;
 197         cfg80211_regdomain = rd;
 198 }
 199
 200 bool is_world_regdom(const char *alpha2)
 201 {
 202         if (!alpha2)
 203                 return false;
 204         if (alpha2[0] == '0' && alpha2[1] == '0')
 205                 return true;
 206         return false;
 207 }
 208
 209 static bool is_alpha2_set(const char *alpha2)
 210 {
 211         if (!alpha2)
 212                 return false;
 213         if (alpha2[0] != 0 && alpha2[1] != 0)
 214                 return true;
 215         return false;
 216 }
 217
 218 static bool is_unknown_alpha2(const char *alpha2)
 219 {
 220         if (!alpha2)
 221                 return false;
 222         /*
 223          * Special case where regulatory domain was built by driver
 224          * but a specific alpha2 cannot be determined
 225          */
 226         if (alpha2[0] == '9' && alpha2[1] == '9')
 227                 return true;
 228         return false;
 229 }
 230
 231 static bool is_intersected_alpha2(const char *alpha2)
 232 {
 233         if (!alpha2)
 234                 return false;
 235         /*
 236          * Special case where regulatory domain is the
 237          * result of an intersection between two regulatory domain
 238          * structures
 239          */
 240         if (alpha2[0] == '9' && alpha2[1] == '8')
 241                 return true;
 242         return false;
 243 }
 244
 245 static bool is_an_alpha2(const char *alpha2)
 246 {
 247         if (!alpha2)
 248                 return false;
 249         if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
 250                 return true;
 251         return false;
 252 }
 253
 254 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
 255 {
 256         if (!alpha2_x || !alpha2_y)
 257                 return false;
 258         if (alpha2_x[0] == alpha2_y[0] &&
 259                 alpha2_x[1] == alpha2_y[1])
 260                 return true;
 261         return false;
 262 }
 263
 264 static bool regdom_changes(const char *alpha2)
 265 {
 266         assert_cfg80211_lock();
 267
 268         if (!cfg80211_regdomain)
 269                 return true;
 270         if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
 271                 return false;
 272         return true;
 273 }
 274
 275 /*
 276  * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
 277  * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
 278  * has ever been issued.
 279  */
 280 static bool is_user_regdom_saved(void)
 281 {
 282         if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
 283                 return false;
 284
 285         /* This would indicate a mistake on the design */
 286         if (WARN((!is_world_regdom(user_alpha2) &&
 287                   !is_an_alpha2(user_alpha2)),
 288                  "Unexpected user alpha2: %c%c\n",
 289                  user_alpha2[0],
 290                  user_alpha2[1]))
 291                 return false;
 292
 293         return true;
 294 }
 295
 296 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
 297                          const struct ieee80211_regdomain *src_regd)
 298 {
 299         struct ieee80211_regdomain *regd;
 300         int size_of_regd = 0;
 301         unsigned int i;
 302
 303         size_of_regd = sizeof(struct ieee80211_regdomain) +
 304           ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
 305
 306         regd = kzalloc(size_of_regd, GFP_KERNEL);
 307         if (!regd)
 308                 return -ENOMEM;
 309
 310         memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
 311
 312         for (i = 0; i < src_regd->n_reg_rules; i++)
 313                 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
 314                         sizeof(struct ieee80211_reg_rule));
 315
 316         *dst_regd = regd;
 317         return 0;
 318 }
 319
 320 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
 321 struct reg_regdb_search_request {
 322         char alpha2[2];
 323         struct list_head list;
 324 };
 325
 326 static LIST_HEAD(reg_regdb_search_list);
 327 static DEFINE_MUTEX(reg_regdb_search_mutex);
 328
 329 static void reg_regdb_search(struct work_struct *work)
 330 {
 331         struct reg_regdb_search_request *request;
 332         const struct ieee80211_regdomain *curdom, *regdom;
 333         int i, r;
 334
 335         mutex_lock(&reg_regdb_search_mutex);
 336         while (!list_empty(&reg_regdb_search_list)) {
 337                 request = list_first_entry(&reg_regdb_search_list,
 338                                            struct reg_regdb_search_request,
 339                                            list);
 340                 list_del(&request->list);
 341
 342                 for (i=0; i<reg_regdb_size; i++) {
 343                         curdom = reg_regdb[i];
 344
 345                         if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
 346                                 r = reg_copy_regd(&regdom, curdom);
 347                                 if (r)
 348                                         break;
 349                                 mutex_lock(&cfg80211_mutex);
 350                                 set_regdom(regdom);
 351                                 mutex_unlock(&cfg80211_mutex);
 352                                 break;
 353                         }
 354                 }
 355
 356                 kfree(request);
 357         }
 358         mutex_unlock(&reg_regdb_search_mutex);
 359 }
 360
 361 static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
 362
 363 static void reg_regdb_query(const char *alpha2)
 364 {
 365         struct reg_regdb_search_request *request;
 366
 367         if (!alpha2)
 368                 return;
 369
 370         request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
 371         if (!request)
 372                 return;
 373
 374         memcpy(request->alpha2, alpha2, 2);
 375
 376         mutex_lock(&reg_regdb_search_mutex);
 377         list_add_tail(&request->list, &reg_regdb_search_list);
 378         mutex_unlock(&reg_regdb_search_mutex);
 379
 380         schedule_work(&reg_regdb_work);
 381 }
 382 #else
 383 static inline void reg_regdb_query(const char *alpha2) {}
 384 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
 385
 386 /*
 387  * This lets us keep regulatory code which is updated on a regulatory
 388  * basis in userspace. Country information is filled in by
 389  * reg_device_uevent
 390  */
 391 static int call_crda(const char *alpha2)
 392 {
 393         if (!is_world_regdom((char *) alpha2))
 394                 pr_info("Calling CRDA for country: %c%c\n",
 395                         alpha2[0], alpha2[1]);
 396         else
 397                 pr_info("Calling CRDA to update world regulatory domain\n");
 398
 399         /* query internal regulatory database (if it exists) */
 400         reg_regdb_query(alpha2);
 401
 402         return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
 403 }
 404
 405 /* Used by nl80211 before kmalloc'ing our regulatory domain */
 406 bool reg_is_valid_request(const char *alpha2)
 407 {
 408         assert_cfg80211_lock();
 409
 410         if (!last_request)
 411                 return false;
 412
 413         return alpha2_equal(last_request->alpha2, alpha2);
 414 }
 415
 416 /* Sanity check on a regulatory rule */
 417 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
 418 {
 419         const struct ieee80211_freq_range *freq_range = &rule->freq_range;
 420         u32 freq_diff;
 421
 422         if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
 423                 return false;
 424
 425         if (freq_range->start_freq_khz > freq_range->end_freq_khz)
 426                 return false;
 427
 428         freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 429
 430         if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
 431                         freq_range->max_bandwidth_khz > freq_diff)
 432                 return false;
 433
 434         return true;
 435 }
 436
 437 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
 438 {
 439         const struct ieee80211_reg_rule *reg_rule = NULL;
 440         unsigned int i;
 441
 442         if (!rd->n_reg_rules)
 443                 return false;
 444
 445         if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
 446                 return false;
 447
 448         for (i = 0; i < rd->n_reg_rules; i++) {
 449                 reg_rule = &rd->reg_rules[i];
 450                 if (!is_valid_reg_rule(reg_rule))
 451                         return false;
 452         }
 453
 454         return true;
 455 }
 456
 457 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
 458                             u32 center_freq_khz,
 459                             u32 bw_khz)
 460 {
 461         u32 start_freq_khz, end_freq_khz;
 462
 463         start_freq_khz = center_freq_khz - (bw_khz/2);
 464         end_freq_khz = center_freq_khz + (bw_khz/2);
 465
 466         if (start_freq_khz >= freq_range->start_freq_khz &&
 467             end_freq_khz <= freq_range->end_freq_khz)
 468                 return true;
 469
 470         return false;
 471 }
 472
 473 /**
 474  * freq_in_rule_band - tells us if a frequency is in a frequency band
 475  * @freq_range: frequency rule we want to query
 476  * @freq_khz: frequency we are inquiring about
 477  *
 478  * This lets us know if a specific frequency rule is or is not relevant to
 479  * a specific frequency's band. Bands are device specific and artificial
 480  * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
 481  * safe for now to assume that a frequency rule should not be part of a
 482  * frequency's band if the start freq or end freq are off by more than 2 GHz.
 483  * This resolution can be lowered and should be considered as we add
 484  * regulatory rule support for other "bands".
 485  **/
 486 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
 487         u32 freq_khz)
 488 {
 489 #define ONE_GHZ_IN_KHZ  1000000
 490         if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
 491                 return true;
 492         if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
 493                 return true;
 494         return false;
 495 #undef ONE_GHZ_IN_KHZ
 496 }
 497
 498 /*
 499  * Helper for regdom_intersect(), this does the real
 500  * mathematical intersection fun
 501  */
 502 static int reg_rules_intersect(
 503         const struct ieee80211_reg_rule *rule1,
 504         const struct ieee80211_reg_rule *rule2,
 505         struct ieee80211_reg_rule *intersected_rule)
 506 {
 507         const struct ieee80211_freq_range *freq_range1, *freq_range2;
 508         struct ieee80211_freq_range *freq_range;
 509         const struct ieee80211_power_rule *power_rule1, *power_rule2;
 510         struct ieee80211_power_rule *power_rule;
 511         u32 freq_diff;
 512
 513         freq_range1 = &rule1->freq_range;
 514         freq_range2 = &rule2->freq_range;
 515         freq_range = &intersected_rule->freq_range;
 516
 517         power_rule1 = &rule1->power_rule;
 518         power_rule2 = &rule2->power_rule;
 519         power_rule = &intersected_rule->power_rule;
 520
 521         freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
 522                 freq_range2->start_freq_khz);
 523         freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
 524                 freq_range2->end_freq_khz);
 525         freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
 526                 freq_range2->max_bandwidth_khz);
 527
 528         freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 529         if (freq_range->max_bandwidth_khz > freq_diff)
 530                 freq_range->max_bandwidth_khz = freq_diff;
 531
 532         power_rule->max_eirp = min(power_rule1->max_eirp,
 533                 power_rule2->max_eirp);
 534         power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
 535                 power_rule2->max_antenna_gain);
 536
 537         intersected_rule->flags = (rule1->flags | rule2->flags);
 538
 539         if (!is_valid_reg_rule(intersected_rule))
 540                 return -EINVAL;
 541
 542         return 0;
 543 }
 544
 545 /**
 546  * regdom_intersect - do the intersection between two regulatory domains
 547  * @rd1: first regulatory domain
 548  * @rd2: second regulatory domain
 549  *
 550  * Use this function to get the intersection between two regulatory domains.
 551  * Once completed we will mark the alpha2 for the rd as intersected, "98",
 552  * as no one single alpha2 can represent this regulatory domain.
 553  *
 554  * Returns a pointer to the regulatory domain structure which will hold the
 555  * resulting intersection of rules between rd1 and rd2. We will
 556  * kzalloc() this structure for you.
 557  */
 558 static struct ieee80211_regdomain *regdom_intersect(
 559         const struct ieee80211_regdomain *rd1,
 560         const struct ieee80211_regdomain *rd2)
 561 {
 562         int r, size_of_regd;
 563         unsigned int x, y;
 564         unsigned int num_rules = 0, rule_idx = 0;
 565         const struct ieee80211_reg_rule *rule1, *rule2;
 566         struct ieee80211_reg_rule *intersected_rule;
 567         struct ieee80211_regdomain *rd;
 568         /* This is just a dummy holder to help us count */
 569         struct ieee80211_reg_rule irule;
 570
 571         /* Uses the stack temporarily for counter arithmetic */
 572         intersected_rule = &irule;
 573
 574         memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
 575
 576         if (!rd1 || !rd2)
 577                 return NULL;
 578
 579         /*
 580          * First we get a count of the rules we'll need, then we actually
 581          * build them. This is to so we can malloc() and free() a
 582          * regdomain once. The reason we use reg_rules_intersect() here
 583          * is it will return -EINVAL if the rule computed makes no sense.
 584          * All rules that do check out OK are valid.
 585          */
 586
 587         for (x = 0; x < rd1->n_reg_rules; x++) {
 588                 rule1 = &rd1->reg_rules[x];
 589                 for (y = 0; y < rd2->n_reg_rules; y++) {
 590                         rule2 = &rd2->reg_rules[y];
 591                         if (!reg_rules_intersect(rule1, rule2,
 592                                         intersected_rule))
 593                                 num_rules++;
 594                         memset(intersected_rule, 0,
 595                                         sizeof(struct ieee80211_reg_rule));
 596                 }
 597         }
 598
 599         if (!num_rules)
 600                 return NULL;
 601
 602         size_of_regd = sizeof(struct ieee80211_regdomain) +
 603                 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
 604
 605         rd = kzalloc(size_of_regd, GFP_KERNEL);
 606         if (!rd)
 607                 return NULL;
 608
 609         for (x = 0; x < rd1->n_reg_rules; x++) {
 610                 rule1 = &rd1->reg_rules[x];
 611                 for (y = 0; y < rd2->n_reg_rules; y++) {
 612                         rule2 = &rd2->reg_rules[y];
 613                         /*
 614                          * This time around instead of using the stack lets
 615                          * write to the target rule directly saving ourselves
 616                          * a memcpy()
 617                          */
 618                         intersected_rule = &rd->reg_rules[rule_idx];
 619                         r = reg_rules_intersect(rule1, rule2,
 620                                 intersected_rule);
 621                         /*
 622                          * No need to memset here the intersected rule here as
 623                          * we're not using the stack anymore
 624                          */
 625                         if (r)
 626                                 continue;
 627                         rule_idx++;
 628                 }
 629         }
 630
 631         if (rule_idx != num_rules) {
 632                 kfree(rd);
 633                 return NULL;
 634         }
 635
 636         rd->n_reg_rules = num_rules;
 637         rd->alpha2[0] = '9';
 638         rd->alpha2[1] = '8';
 639
 640         return rd;
 641 }
 642
 643 /*
 644  * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
 645  * want to just have the channel structure use these
 646  */
 647 static u32 map_regdom_flags(u32 rd_flags)
 648 {
 649         u32 channel_flags = 0;
 650         if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
 651                 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 652         if (rd_flags & NL80211_RRF_NO_IBSS)
 653                 channel_flags |= IEEE80211_CHAN_NO_IBSS;
 654         if (rd_flags & NL80211_RRF_DFS)
 655                 channel_flags |= IEEE80211_CHAN_RADAR;
 656         return channel_flags;
 657 }
 658
 659 static int freq_reg_info_regd(struct wiphy *wiphy,
 660                               u32 center_freq,
 661                               u32 desired_bw_khz,
 662                               const struct ieee80211_reg_rule **reg_rule,
 663                               const struct ieee80211_regdomain *custom_regd)
 664 {
 665         int i;
 666         bool band_rule_found = false;
 667         const struct ieee80211_regdomain *regd;
 668         bool bw_fits = false;
 669
 670         if (!desired_bw_khz)
 671                 desired_bw_khz = MHZ_TO_KHZ(20);
 672
 673         regd = custom_regd ? custom_regd : cfg80211_regdomain;
 674
 675         /*
 676          * Follow the driver's regulatory domain, if present, unless a country
 677          * IE has been processed or a user wants to help complaince further
 678          */
 679         if (!custom_regd &&
 680             last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
 681             last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
 682             wiphy->regd)
 683                 regd = wiphy->regd;
 684
 685         if (!regd)
 686                 return -EINVAL;
 687
 688         for (i = 0; i < regd->n_reg_rules; i++) {
 689                 const struct ieee80211_reg_rule *rr;
 690                 const struct ieee80211_freq_range *fr = NULL;
 691
 692                 rr = &regd->reg_rules[i];
 693                 fr = &rr->freq_range;
 694
 695                 /*
 696                  * We only need to know if one frequency rule was
 697                  * was in center_freq's band, that's enough, so lets
 698                  * not overwrite it once found
 699                  */
 700                 if (!band_rule_found)
 701                         band_rule_found = freq_in_rule_band(fr, center_freq);
 702
 703                 bw_fits = reg_does_bw_fit(fr,
 704                                           center_freq,
 705                                           desired_bw_khz);
 706
 707                 if (band_rule_found && bw_fits) {
 708                         *reg_rule = rr;
 709                         return 0;
 710                 }
 711         }
 712
 713         if (!band_rule_found)
 714                 return -ERANGE;
 715
 716         return -EINVAL;
 717 }
 718
 719 int freq_reg_info(struct wiphy *wiphy,
 720                   u32 center_freq,
 721                   u32 desired_bw_khz,
 722                   const struct ieee80211_reg_rule **reg_rule)
 723 {
 724         assert_cfg80211_lock();
 725         return freq_reg_info_regd(wiphy,
 726                                   center_freq,
 727                                   desired_bw_khz,
 728                                   reg_rule,
 729                                   NULL);
 730 }
 731 EXPORT_SYMBOL(freq_reg_info);
 732
 733 #ifdef CONFIG_CFG80211_REG_DEBUG
 734 static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
 735 {
 736         switch (initiator) {
 737         case NL80211_REGDOM_SET_BY_CORE:
 738                 return "Set by core";
 739         case NL80211_REGDOM_SET_BY_USER:
 740                 return "Set by user";
 741         case NL80211_REGDOM_SET_BY_DRIVER:
 742                 return "Set by driver";
 743         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 744                 return "Set by country IE";
 745         default:
 746                 WARN_ON(1);
 747                 return "Set by bug";
 748         }
 749 }
 750
 751 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
 752                                     u32 desired_bw_khz,
 753                                     const struct ieee80211_reg_rule *reg_rule)
 754 {
 755         const struct ieee80211_power_rule *power_rule;
 756         const struct ieee80211_freq_range *freq_range;
 757         char max_antenna_gain[32];
 758
 759         power_rule = &reg_rule->power_rule;
 760         freq_range = &reg_rule->freq_range;
 761
 762         if (!power_rule->max_antenna_gain)
 763                 snprintf(max_antenna_gain, 32, "N/A");
 764         else
 765                 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
 766
 767         REG_DBG_PRINT("Updating information on frequency %d MHz "
 768                       "for a %d MHz width channel with regulatory rule:\n",
 769                       chan->center_freq,
 770                       KHZ_TO_MHZ(desired_bw_khz));
 771
 772         REG_DBG_PRINT("%d KHz - %d KHz @  KHz), (%s mBi, %d mBm)\n",
 773                       freq_range->start_freq_khz,
 774                       freq_range->end_freq_khz,
 775                       max_antenna_gain,
 776                       power_rule->max_eirp);
 777 }
 778 #else
 779 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
 780                                     u32 desired_bw_khz,
 781                                     const struct ieee80211_reg_rule *reg_rule)
 782 {
 783         return;
 784 }
 785 #endif
 786
 787 /*
 788  * Note that right now we assume the desired channel bandwidth
 789  * is always 20 MHz for each individual channel (HT40 uses 20 MHz
 790  * per channel, the primary and the extension channel). To support
 791  * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
 792  * new ieee80211_channel.target_bw and re run the regulatory check
 793  * on the wiphy with the target_bw specified. Then we can simply use
 794  * that below for the desired_bw_khz below.
 795  */
 796 static void handle_channel(struct wiphy *wiphy,
 797                            enum nl80211_reg_initiator initiator,
 798                            enum ieee80211_band band,
 799                            unsigned int chan_idx)
 800 {
 801         int r;
 802         u32 flags, bw_flags = 0;
 803         u32 desired_bw_khz = MHZ_TO_KHZ(20);
 804         const struct ieee80211_reg_rule *reg_rule = NULL;
 805         const struct ieee80211_power_rule *power_rule = NULL;
 806         const struct ieee80211_freq_range *freq_range = NULL;
 807         struct ieee80211_supported_band *sband;
 808         struct ieee80211_channel *chan;
 809         struct wiphy *request_wiphy = NULL;
 810
 811         assert_cfg80211_lock();
 812
 813         request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
 814
 815         sband = wiphy->bands[band];
 816         BUG_ON(chan_idx >= sband->n_channels);
 817         chan = &sband->channels[chan_idx];
 818
 819         flags = chan->orig_flags;
 820
 821         r = freq_reg_info(wiphy,
 822                           MHZ_TO_KHZ(chan->center_freq),
 823                           desired_bw_khz,
 824                           &reg_rule);
 825
 826         if (r) {
 827                 /*
 828                  * We will disable all channels that do not match our
 829                  * received regulatory rule unless the hint is coming
 830                  * from a Country IE and the Country IE had no information
 831                  * about a band. The IEEE 802.11 spec allows for an AP
 832                  * to send only a subset of the regulatory rules allowed,
 833                  * so an AP in the US that only supports 2.4 GHz may only send
 834                  * a country IE with information for the 2.4 GHz band
 835                  * while 5 GHz is still supported.
 836                  */
 837                 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
 838                     r == -ERANGE)
 839                         return;
 840
 841                 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
 842                 chan->flags = IEEE80211_CHAN_DISABLED;
 843                 return;
 844         }
 845
 846         chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
 847
 848         power_rule = &reg_rule->power_rule;
 849         freq_range = &reg_rule->freq_range;
 850
 851         if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
 852                 bw_flags = IEEE80211_CHAN_NO_HT40;
 853
 854         if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
 855             request_wiphy && request_wiphy == wiphy &&
 856             request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
 857                 /*
 858                  * This guarantees the driver's requested regulatory domain
 859                  * will always be used as a base for further regulatory
 860                  * settings
 861                  */
 862                 chan->flags = chan->orig_flags =
 863                         map_regdom_flags(reg_rule->flags) | bw_flags;
 864                 chan->max_antenna_gain = chan->orig_mag =
 865                         (int) MBI_TO_DBI(power_rule->max_antenna_gain);
 866                 chan->max_power = chan->orig_mpwr =
 867                         (int) MBM_TO_DBM(power_rule->max_eirp);
 868                 return;
 869         }
 870
 871         chan->beacon_found = false;
 872         chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
 873         chan->max_antenna_gain = min(chan->orig_mag,
 874                 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
 875         if (chan->orig_mpwr)
 876                 chan->max_power = min(chan->orig_mpwr,
 877                         (int) MBM_TO_DBM(power_rule->max_eirp));
 878         else
 879                 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
 880 }
 881
 882 static void handle_band(struct wiphy *wiphy,
 883                         enum ieee80211_band band,
 884                         enum nl80211_reg_initiator initiator)
 885 {
 886         unsigned int i;
 887         struct ieee80211_supported_band *sband;
 888
 889         BUG_ON(!wiphy->bands[band]);
 890         sband = wiphy->bands[band];
 891
 892         for (i = 0; i < sband->n_channels; i++)
 893                 handle_channel(wiphy, initiator, band, i);
 894 }
 895
 896 static bool ignore_reg_update(struct wiphy *wiphy,
 897                               enum nl80211_reg_initiator initiator)
 898 {
 899         if (!last_request) {
 900                 REG_DBG_PRINT("Ignoring regulatory request %s since "
 901                               "last_request is not set\n",
 902                               reg_initiator_name(initiator));
 903                 return true;
 904         }
 905
 906         if (initiator == NL80211_REGDOM_SET_BY_CORE &&
 907             wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 908                 REG_DBG_PRINT("Ignoring regulatory request %s "
 909                               "since the driver uses its own custom "
 910                               "regulatory domain ",
 911                               reg_initiator_name(initiator));
 912                 return true;
 913         }
 914
 915         /*
 916          * wiphy->regd will be set once the device has its own
 917          * desired regulatory domain set
 918          */
 919         if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
 920             initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
 921             !is_world_regdom(last_request->alpha2)) {
 922                 REG_DBG_PRINT("Ignoring regulatory request %s "
 923                               "since the driver requires its own regulaotry "
 924                               "domain to be set first",
 925                               reg_initiator_name(initiator));
 926                 return true;
 927         }
 928
 929         return false;
 930 }
 931
 932 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
 933 {
 934         struct cfg80211_registered_device *rdev;
 935
 936         list_for_each_entry(rdev, &cfg80211_rdev_list, list)
 937                 wiphy_update_regulatory(&rdev->wiphy, initiator);
 938 }
 939
 940 static void handle_reg_beacon(struct wiphy *wiphy,
 941                               unsigned int chan_idx,
 942                               struct reg_beacon *reg_beacon)
 943 {
 944         struct ieee80211_supported_band *sband;
 945         struct ieee80211_channel *chan;
 946         bool channel_changed = false;
 947         struct ieee80211_channel chan_before;
 948
 949         assert_cfg80211_lock();
 950
 951         sband = wiphy->bands[reg_beacon->chan.band];
 952         chan = &sband->channels[chan_idx];
 953
 954         if (likely(chan->center_freq != reg_beacon->chan.center_freq))
 955                 return;
 956
 957         if (chan->beacon_found)
 958                 return;
 959
 960         chan->beacon_found = true;
 961
 962         if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
 963                 return;
 964
 965         chan_before.center_freq = chan->center_freq;
 966         chan_before.flags = chan->flags;
 967
 968         if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
 969                 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 970                 channel_changed = true;
 971         }
 972
 973         if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
 974                 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
 975                 channel_changed = true;
 976         }
 977
 978         if (channel_changed)
 979                 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
 980 }
 981
 982 /*
 983  * Called when a scan on a wiphy finds a beacon on
 984  * new channel
 985  */
 986 static void wiphy_update_new_beacon(struct wiphy *wiphy,
 987                                     struct reg_beacon *reg_beacon)
 988 {
 989         unsigned int i;
 990         struct ieee80211_supported_band *sband;
 991
 992         assert_cfg80211_lock();
 993
 994         if (!wiphy->bands[reg_beacon->chan.band])
 995                 return;
 996
 997         sband = wiphy->bands[reg_beacon->chan.band];
 998
 999         for (i = 0; i < sband->n_channels; i++)
1000                 handle_reg_beacon(wiphy, i, reg_beacon);
1001 }
1002
1003 /*
1004  * Called upon reg changes or a new wiphy is added
1005  */
1006 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1007 {
1008         unsigned int i;
1009         struct ieee80211_supported_band *sband;
1010         struct reg_beacon *reg_beacon;
1011
1012         assert_cfg80211_lock();
1013
1014         if (list_empty(&reg_beacon_list))
1015                 return;
1016
1017         list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1018                 if (!wiphy->bands[reg_beacon->chan.band])
1019                         continue;
1020                 sband = wiphy->bands[reg_beacon->chan.band];
1021                 for (i = 0; i < sband->n_channels; i++)
1022                         handle_reg_beacon(wiphy, i, reg_beacon);
1023         }
1024 }
1025
1026 static bool reg_is_world_roaming(struct wiphy *wiphy)
1027 {
1028         if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1029             (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1030                 return true;
1031         if (last_request &&
1032             last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1033             wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1034                 return true;
1035         return false;
1036 }
1037
1038 /* Reap the advantages of previously found beacons */
1039 static void reg_process_beacons(struct wiphy *wiphy)
1040 {
1041         /*
1042          * Means we are just firing up cfg80211, so no beacons would
1043          * have been processed yet.
1044          */
1045         if (!last_request)
1046                 return;
1047         if (!reg_is_world_roaming(wiphy))
1048                 return;
1049         wiphy_update_beacon_reg(wiphy);
1050 }
1051
1052 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1053 {
1054         if (!chan)
1055                 return true;
1056         if (chan->flags & IEEE80211_CHAN_DISABLED)
1057                 return true;
1058         /* This would happen when regulatory rules disallow HT40 completely */
1059         if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1060                 return true;
1061         return false;
1062 }
1063
1064 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1065                                          enum ieee80211_band band,
1066                                          unsigned int chan_idx)
1067 {
1068         struct ieee80211_supported_band *sband;
1069         struct ieee80211_channel *channel;
1070         struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1071         unsigned int i;
1072
1073         assert_cfg80211_lock();
1074
1075         sband = wiphy->bands[band];
1076         BUG_ON(chan_idx >= sband->n_channels);
1077         channel = &sband->channels[chan_idx];
1078
1079         if (is_ht40_not_allowed(channel)) {
1080                 channel->flags |= IEEE80211_CHAN_NO_HT40;
1081                 return;
1082         }
1083
1084         /*
1085          * We need to ensure the extension channels exist to
1086          * be able to use HT40- or HT40+, this finds them (or not)
1087          */
1088         for (i = 0; i < sband->n_channels; i++) {
1089                 struct ieee80211_channel *c = &sband->channels[i];
1090                 if (c->center_freq == (channel->center_freq - 20))
1091                         channel_before = c;
1092                 if (c->center_freq == (channel->center_freq + 20))
1093                         channel_after = c;
1094         }
1095
1096         /*
1097          * Please note that this assumes target bandwidth is 20 MHz,
1098          * if that ever changes we also need to change the below logic
1099          * to include that as well.
1100          */
1101         if (is_ht40_not_allowed(channel_before))
1102                 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1103         else
1104                 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1105
1106         if (is_ht40_not_allowed(channel_after))
1107                 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1108         else
1109                 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1110 }
1111
1112 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1113                                       enum ieee80211_band band)
1114 {
1115         unsigned int i;
1116         struct ieee80211_supported_band *sband;
1117
1118         BUG_ON(!wiphy->bands[band]);
1119         sband = wiphy->bands[band];
1120
1121         for (i = 0; i < sband->n_channels; i++)
1122                 reg_process_ht_flags_channel(wiphy, band, i);
1123 }
1124
1125 static void reg_process_ht_flags(struct wiphy *wiphy)
1126 {
1127         enum ieee80211_band band;
1128
1129         if (!wiphy)
1130                 return;
1131
1132         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1133                 if (wiphy->bands[band])
1134                         reg_process_ht_flags_band(wiphy, band);
1135         }
1136
1137 }
1138
1139 void wiphy_update_regulatory(struct wiphy *wiphy,
1140                              enum nl80211_reg_initiator initiator)
1141 {
1142         enum ieee80211_band band;
1143
1144         if (ignore_reg_update(wiphy, initiator))
1145                 return;
1146
1147         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1148                 if (wiphy->bands[band])
1149                         handle_band(wiphy, band, initiator);
1150         }
1151
1152         reg_process_beacons(wiphy);
1153         reg_process_ht_flags(wiphy);
1154         if (wiphy->reg_notifier)
1155                 wiphy->reg_notifier(wiphy, last_request);
1156 }
1157
1158 static void handle_channel_custom(struct wiphy *wiphy,
1159                                   enum ieee80211_band band,
1160                                   unsigned int chan_idx,
1161                                   const struct ieee80211_regdomain *regd)
1162 {
1163         int r;
1164         u32 desired_bw_khz = MHZ_TO_KHZ(20);
1165         u32 bw_flags = 0;
1166         const struct ieee80211_reg_rule *reg_rule = NULL;
1167         const struct ieee80211_power_rule *power_rule = NULL;
1168         const struct ieee80211_freq_range *freq_range = NULL;
1169         struct ieee80211_supported_band *sband;
1170         struct ieee80211_channel *chan;
1171
1172         assert_reg_lock();
1173
1174         sband = wiphy->bands[band];
1175         BUG_ON(chan_idx >= sband->n_channels);
1176         chan = &sband->channels[chan_idx];
1177
1178         r = freq_reg_info_regd(wiphy,
1179                                MHZ_TO_KHZ(chan->center_freq),
1180                                desired_bw_khz,
1181                                &reg_rule,
1182                                regd);
1183
1184         if (r) {
1185                 REG_DBG_PRINT("Disabling freq %d MHz as custom "
1186                               "regd has no rule that fits a %d MHz "
1187                               "wide channel\n",
1188                               chan->center_freq,
1189                               KHZ_TO_MHZ(desired_bw_khz));
1190                 chan->flags = IEEE80211_CHAN_DISABLED;
1191                 return;
1192         }
1193
1194         chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1195
1196         power_rule = &reg_rule->power_rule;
1197         freq_range = &reg_rule->freq_range;
1198
1199         if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1200                 bw_flags = IEEE80211_CHAN_NO_HT40;
1201
1202         chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1203         chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1204         chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1205 }
1206
1207 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1208                                const struct ieee80211_regdomain *regd)
1209 {
1210         unsigned int i;
1211         struct ieee80211_supported_band *sband;
1212
1213         BUG_ON(!wiphy->bands[band]);
1214         sband = wiphy->bands[band];
1215
1216         for (i = 0; i < sband->n_channels; i++)
1217                 handle_channel_custom(wiphy, band, i, regd);
1218 }
1219
1220 /* Used by drivers prior to wiphy registration */
1221 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1222                                    const struct ieee80211_regdomain *regd)
1223 {
1224         enum ieee80211_band band;
1225         unsigned int bands_set = 0;
1226
1227         mutex_lock(&reg_mutex);
1228         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1229                 if (!wiphy->bands[band])
1230                         continue;
1231                 handle_band_custom(wiphy, band, regd);
1232                 bands_set++;
1233         }
1234         mutex_unlock(&reg_mutex);
1235
1236         /*
1237          * no point in calling this if it won't have any effect
1238          * on your device's supportd bands.
1239          */
1240         WARN_ON(!bands_set);
1241 }
1242 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1243
1244 /*
1245  * Return value which can be used by ignore_request() to indicate
1246  * it has been determined we should intersect two regulatory domains
1247  */
1248 #define REG_INTERSECT   1
1249
1250 /* This has the logic which determines when a new request
1251  * should be ignored. */
1252 static int ignore_request(struct wiphy *wiphy,
1253                           struct regulatory_request *pending_request)
1254 {
1255         struct wiphy *last_wiphy = NULL;
1256
1257         assert_cfg80211_lock();
1258
1259         /* All initial requests are respected */
1260         if (!last_request)
1261                 return 0;
1262
1263         switch (pending_request->initiator) {
1264         case NL80211_REGDOM_SET_BY_CORE:
1265                 return 0;
1266         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1267
1268                 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1269
1270                 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1271                         return -EINVAL;
1272                 if (last_request->initiator ==
1273                     NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1274                         if (last_wiphy != wiphy) {
1275                                 /*
1276                                  * Two cards with two APs claiming different
1277                                  * Country IE alpha2s. We could
1278                                  * intersect them, but that seems unlikely
1279                                  * to be correct. Reject second one for now.
1280                                  */
1281                                 if (regdom_changes(pending_request->alpha2))
1282                                         return -EOPNOTSUPP;
1283                                 return -EALREADY;
1284                         }
1285                         /*
1286                          * Two consecutive Country IE hints on the same wiphy.
1287                          * This should be picked up early by the driver/stack
1288                          */
1289                         if (WARN_ON(regdom_changes(pending_request->alpha2)))
1290                                 return 0;
1291                         return -EALREADY;
1292                 }
1293                 return 0;
1294         case NL80211_REGDOM_SET_BY_DRIVER:
1295                 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1296                         if (regdom_changes(pending_request->alpha2))
1297                                 return 0;
1298                         return -EALREADY;
1299                 }
1300
1301                 /*
1302                  * This would happen if you unplug and plug your card
1303                  * back in or if you add a new device for which the previously
1304                  * loaded card also agrees on the regulatory domain.
1305                  */
1306                 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1307                     !regdom_changes(pending_request->alpha2))
1308                         return -EALREADY;
1309
1310                 return REG_INTERSECT;
1311         case NL80211_REGDOM_SET_BY_USER:
1312                 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1313                         return REG_INTERSECT;
1314                 /*
1315                  * If the user knows better the user should set the regdom
1316                  * to their country before the IE is picked up
1317                  */
1318                 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1319                           last_request->intersect)
1320                         return -EOPNOTSUPP;
1321                 /*
1322                  * Process user requests only after previous user/driver/core
1323                  * requests have been processed
1324                  */
1325                 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1326                     last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1327                     last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1328                         if (regdom_changes(last_request->alpha2))
1329                                 return -EAGAIN;
1330                 }
1331
1332                 if (!regdom_changes(pending_request->alpha2))
1333                         return -EALREADY;
1334
1335                 return 0;
1336         }
1337
1338         return -EINVAL;
1339 }
1340
1341 static void reg_set_request_processed(void)
1342 {
1343         bool need_more_processing = false;
1344
1345         last_request->processed = true;
1346
1347         spin_lock(&reg_requests_lock);
1348         if (!list_empty(&reg_requests_list))
1349                 need_more_processing = true;
1350         spin_unlock(&reg_requests_lock);
1351
1352         if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
1353                 cancel_delayed_work_sync(&reg_timeout);
1354
1355         if (need_more_processing)
1356                 schedule_work(&reg_work);
1357 }
1358
1359 /**
1360  * __regulatory_hint - hint to the wireless core a regulatory domain
1361  * @wiphy: if the hint comes from country information from an AP, this
1362  *      is required to be set to the wiphy that received the information
1363  * @pending_request: the regulatory request currently being processed
1364  *
1365  * The Wireless subsystem can use this function to hint to the wireless core
1366  * what it believes should be the current regulatory domain.
1367  *
1368  * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1369  * already been set or other standard error codes.
1370  *
1371  * Caller must hold &cfg80211_mutex and &reg_mutex
1372  */
1373 static int __regulatory_hint(struct wiphy *wiphy,
1374                              struct regulatory_request *pending_request)
1375 {
1376         bool intersect = false;
1377         int r = 0;
1378
1379         assert_cfg80211_lock();
1380
1381         r = ignore_request(wiphy, pending_request);
1382
1383         if (r == REG_INTERSECT) {
1384                 if (pending_request->initiator ==
1385                     NL80211_REGDOM_SET_BY_DRIVER) {
1386                         r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1387                         if (r) {
1388                                 kfree(pending_request);
1389                                 return r;
1390                         }
1391                 }
1392                 intersect = true;
1393         } else if (r) {
1394                 /*
1395                  * If the regulatory domain being requested by the
1396                  * driver has already been set just copy it to the
1397                  * wiphy
1398                  */
1399                 if (r == -EALREADY &&
1400                     pending_request->initiator ==
1401                     NL80211_REGDOM_SET_BY_DRIVER) {
1402                         r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1403                         if (r) {
1404                                 kfree(pending_request);
1405                                 return r;
1406                         }
1407                         r = -EALREADY;
1408                         goto new_request;
1409                 }
1410                 kfree(pending_request);
1411                 return r;
1412         }
1413
1414 new_request:
1415         if (last_request != &core_request_world)
1416                 kfree(last_request);
1417
1418         last_request = pending_request;
1419         last_request->intersect = intersect;
1420
1421         pending_request = NULL;
1422
1423         if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1424                 user_alpha2[0] = last_request->alpha2[0];
1425                 user_alpha2[1] = last_request->alpha2[1];
1426         }
1427
1428         /* When r == REG_INTERSECT we do need to call CRDA */
1429         if (r < 0) {
1430                 /*
1431                  * Since CRDA will not be called in this case as we already
1432                  * have applied the requested regulatory domain before we just
1433                  * inform userspace we have processed the request
1434                  */
1435                 if (r == -EALREADY) {
1436                         nl80211_send_reg_change_event(last_request);
1437                         reg_set_request_processed();
1438                 }
1439                 return r;
1440         }
1441
1442         return call_crda(last_request->alpha2);
1443 }
1444
1445 /* This processes *all* regulatory hints */
1446 static void reg_process_hint(struct regulatory_request *reg_request)
1447 {
1448         int r = 0;
1449         struct wiphy *wiphy = NULL;
1450         enum nl80211_reg_initiator initiator = reg_request->initiator;
1451
1452         BUG_ON(!reg_request->alpha2);
1453
1454         if (wiphy_idx_valid(reg_request->wiphy_idx))
1455                 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1456
1457         if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1458             !wiphy) {
1459                 kfree(reg_request);
1460                 return;
1461         }
1462
1463         r = __regulatory_hint(wiphy, reg_request);
1464         /* This is required so that the orig_* parameters are saved */
1465         if (r == -EALREADY && wiphy &&
1466             wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
1467                 wiphy_update_regulatory(wiphy, initiator);
1468                 return;
1469         }
1470
1471         /*
1472          * We only time out user hints, given that they should be the only
1473          * source of bogus requests.
1474          */
1475         if (r != -EALREADY &&
1476             reg_request->initiator == NL80211_REGDOM_SET_BY_USER)
1477                 schedule_delayed_work(&reg_timeout, msecs_to_jiffies(3142));
1478 }
1479
1480 /*
1481  * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1482  * Regulatory hints come on a first come first serve basis and we
1483  * must process each one atomically.
1484  */
1485 static void reg_process_pending_hints(void)
1486 {
1487         struct regulatory_request *reg_request;
1488
1489         mutex_lock(&cfg80211_mutex);
1490         mutex_lock(&reg_mutex);
1491
1492         /* When last_request->processed becomes true this will be rescheduled */
1493         if (last_request && !last_request->processed) {
1494                 REG_DBG_PRINT("Pending regulatory request, waiting "
1495                               "for it to be processed...");
1496                 goto out;
1497         }
1498
1499         spin_lock(&reg_requests_lock);
1500
1501         if (list_empty(&reg_requests_list)) {
1502                 spin_unlock(&reg_requests_lock);
1503                 goto out;
1504         }
1505
1506         reg_request = list_first_entry(&reg_requests_list,
1507                                        struct regulatory_request,
1508                                        list);
1509         list_del_init(&reg_request->list);
1510
1511         spin_unlock(&reg_requests_lock);
1512
1513         reg_process_hint(reg_request);
1514
1515 out:
1516         mutex_unlock(&reg_mutex);
1517         mutex_unlock(&cfg80211_mutex);
1518 }
1519
1520 /* Processes beacon hints -- this has nothing to do with country IEs */
1521 static void reg_process_pending_beacon_hints(void)
1522 {
1523         struct cfg80211_registered_device *rdev;
1524         struct reg_beacon *pending_beacon, *tmp;
1525
1526         /*
1527          * No need to hold the reg_mutex here as we just touch wiphys
1528          * and do not read or access regulatory variables.
1529          */
1530         mutex_lock(&cfg80211_mutex);
1531
1532         /* This goes through the _pending_ beacon list */
1533         spin_lock_bh(&reg_pending_beacons_lock);
1534
1535         if (list_empty(&reg_pending_beacons)) {
1536                 spin_unlock_bh(&reg_pending_beacons_lock);
1537                 goto out;
1538         }
1539
1540         list_for_each_entry_safe(pending_beacon, tmp,
1541                                  &reg_pending_beacons, list) {
1542
1543                 list_del_init(&pending_beacon->list);
1544
1545                 /* Applies the beacon hint to current wiphys */
1546                 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1547                         wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1548
1549                 /* Remembers the beacon hint for new wiphys or reg changes */
1550                 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1551         }
1552
1553         spin_unlock_bh(&reg_pending_beacons_lock);
1554 out:
1555         mutex_unlock(&cfg80211_mutex);
1556 }
1557
1558 static void reg_todo(struct work_struct *work)
1559 {
1560         reg_process_pending_hints();
1561         reg_process_pending_beacon_hints();
1562 }
1563
1564 static void queue_regulatory_request(struct regulatory_request *request)
1565 {
1566         if (isalpha(request->alpha2[0]))
1567                 request->alpha2[0] = toupper(request->alpha2[0]);
1568         if (isalpha(request->alpha2[1]))
1569                 request->alpha2[1] = toupper(request->alpha2[1]);
1570
1571         spin_lock(&reg_requests_lock);
1572         list_add_tail(&request->list, &reg_requests_list);
1573         spin_unlock(&reg_requests_lock);
1574
1575         schedule_work(&reg_work);
1576 }
1577
1578 /*
1579  * Core regulatory hint -- happens during cfg80211_init()
1580  * and when we restore regulatory settings.
1581  */
1582 static int regulatory_hint_core(const char *alpha2)
1583 {
1584         struct regulatory_request *request;
1585
1586         request = kzalloc(sizeof(struct regulatory_request),
1587                           GFP_KERNEL);
1588         if (!request)
1589                 return -ENOMEM;
1590
1591         request->alpha2[0] = alpha2[0];
1592         request->alpha2[1] = alpha2[1];
1593         request->initiator = NL80211_REGDOM_SET_BY_CORE;
1594
1595         queue_regulatory_request(request);
1596
1597         return 0;
1598 }
1599
1600 /* User hints */
1601 int regulatory_hint_user(const char *alpha2)
1602 {
1603         struct regulatory_request *request;
1604
1605         BUG_ON(!alpha2);
1606
1607         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1608         if (!request)
1609                 return -ENOMEM;
1610
1611         request->wiphy_idx = WIPHY_IDX_STALE;
1612         request->alpha2[0] = alpha2[0];
1613         request->alpha2[1] = alpha2[1];
1614         request->initiator = NL80211_REGDOM_SET_BY_USER;
1615
1616         queue_regulatory_request(request);
1617
1618         return 0;
1619 }
1620
1621 /* Driver hints */
1622 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1623 {
1624         struct regulatory_request *request;
1625
1626         BUG_ON(!alpha2);
1627         BUG_ON(!wiphy);
1628
1629         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1630         if (!request)
1631                 return -ENOMEM;
1632
1633         request->wiphy_idx = get_wiphy_idx(wiphy);
1634
1635         /* Must have registered wiphy first */
1636         BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1637
1638         request->alpha2[0] = alpha2[0];
1639         request->alpha2[1] = alpha2[1];
1640         request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1641
1642         queue_regulatory_request(request);
1643
1644         return 0;
1645 }
1646 EXPORT_SYMBOL(regulatory_hint);
1647
1648 /*
1649  * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1650  * therefore cannot iterate over the rdev list here.
1651  */
1652 void regulatory_hint_11d(struct wiphy *wiphy,
1653                          enum ieee80211_band band,
1654                          u8 *country_ie,
1655                          u8 country_ie_len)
1656 {
1657         char alpha2[2];
1658         enum environment_cap env = ENVIRON_ANY;
1659         struct regulatory_request *request;
1660
1661         mutex_lock(&reg_mutex);
1662
1663         if (unlikely(!last_request))
1664                 goto out;
1665
1666         /* IE len must be evenly divisible by 2 */
1667         if (country_ie_len & 0x01)
1668                 goto out;
1669
1670         if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1671                 goto out;
1672
1673         alpha2[0] = country_ie[0];
1674         alpha2[1] = country_ie[1];
1675
1676         if (country_ie[2] == 'I')
1677                 env = ENVIRON_INDOOR;
1678         else if (country_ie[2] == 'O')
1679                 env = ENVIRON_OUTDOOR;
1680
1681         /*
1682          * We will run this only upon a successful connection on cfg80211.
1683          * We leave conflict resolution to the workqueue, where can hold
1684          * cfg80211_mutex.
1685          */
1686         if (likely(last_request->initiator ==
1687             NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1688             wiphy_idx_valid(last_request->wiphy_idx)))
1689                 goto out;
1690
1691         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1692         if (!request)
1693                 goto out;
1694
1695         request->wiphy_idx = get_wiphy_idx(wiphy);
1696         request->alpha2[0] = alpha2[0];
1697         request->alpha2[1] = alpha2[1];
1698         request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1699         request->country_ie_env = env;
1700
1701         mutex_unlock(&reg_mutex);
1702
1703         queue_regulatory_request(request);
1704
1705         return;
1706
1707 out:
1708         mutex_unlock(&reg_mutex);
1709 }
1710
1711 static void restore_alpha2(char *alpha2, bool reset_user)
1712 {
1713         /* indicates there is no alpha2 to consider for restoration */
1714         alpha2[0] = '9';
1715         alpha2[1] = '7';
1716
1717         /* The user setting has precedence over the module parameter */
1718         if (is_user_regdom_saved()) {
1719                 /* Unless we're asked to ignore it and reset it */
1720                 if (reset_user) {
1721                         REG_DBG_PRINT("Restoring regulatory settings "
1722                                "including user preference\n");
1723                         user_alpha2[0] = '9';
1724                         user_alpha2[1] = '7';
1725
1726                         /*
1727                          * If we're ignoring user settings, we still need to
1728                          * check the module parameter to ensure we put things
1729                          * back as they were for a full restore.
1730                          */
1731                         if (!is_world_regdom(ieee80211_regdom)) {
1732                                 REG_DBG_PRINT("Keeping preference on "
1733                                        "module parameter ieee80211_regdom: %c%c\n",
1734                                        ieee80211_regdom[0],
1735                                        ieee80211_regdom[1]);
1736                                 alpha2[0] = ieee80211_regdom[0];
1737                                 alpha2[1] = ieee80211_regdom[1];
1738                         }
1739                 } else {
1740                         REG_DBG_PRINT("Restoring regulatory settings "
1741                                "while preserving user preference for: %c%c\n",
1742                                user_alpha2[0],
1743                                user_alpha2[1]);
1744                         alpha2[0] = user_alpha2[0];
1745                         alpha2[1] = user_alpha2[1];
1746                 }
1747         } else if (!is_world_regdom(ieee80211_regdom)) {
1748                 REG_DBG_PRINT("Keeping preference on "
1749                        "module parameter ieee80211_regdom: %c%c\n",
1750                        ieee80211_regdom[0],
1751                        ieee80211_regdom[1]);
1752                 alpha2[0] = ieee80211_regdom[0];
1753                 alpha2[1] = ieee80211_regdom[1];
1754         } else
1755                 REG_DBG_PRINT("Restoring regulatory settings\n");
1756 }
1757
1758 /*
1759  * Restoring regulatory settings involves ingoring any
1760  * possibly stale country IE information and user regulatory
1761  * settings if so desired, this includes any beacon hints
1762  * learned as we could have traveled outside to another country
1763  * after disconnection. To restore regulatory settings we do
1764  * exactly what we did at bootup:
1765  *
1766  *   - send a core regulatory hint
1767  *   - send a user regulatory hint if applicable
1768  *
1769  * Device drivers that send a regulatory hint for a specific country
1770  * keep their own regulatory domain on wiphy->regd so that does does
1771  * not need to be remembered.
1772  */
1773 static void restore_regulatory_settings(bool reset_user)
1774 {
1775         char alpha2[2];
1776         struct reg_beacon *reg_beacon, *btmp;
1777         struct regulatory_request *reg_request, *tmp;
1778         LIST_HEAD(tmp_reg_req_list);
1779
1780         mutex_lock(&cfg80211_mutex);
1781         mutex_lock(&reg_mutex);
1782
1783         reset_regdomains(true);
1784         restore_alpha2(alpha2, reset_user);
1785
1786         /*
1787          * If there's any pending requests we simply
1788          * stash them to a temporary pending queue and
1789          * add then after we've restored regulatory
1790          * settings.
1791          */
1792         spin_lock(&reg_requests_lock);
1793         if (!list_empty(&reg_requests_list)) {
1794                 list_for_each_entry_safe(reg_request, tmp,
1795                                          &reg_requests_list, list) {
1796                         if (reg_request->initiator !=
1797                             NL80211_REGDOM_SET_BY_USER)
1798                                 continue;
1799                         list_del(&reg_request->list);
1800                         list_add_tail(&reg_request->list, &tmp_reg_req_list);
1801                 }
1802         }
1803         spin_unlock(&reg_requests_lock);
1804
1805         /* Clear beacon hints */
1806         spin_lock_bh(&reg_pending_beacons_lock);
1807         if (!list_empty(&reg_pending_beacons)) {
1808                 list_for_each_entry_safe(reg_beacon, btmp,
1809                                          &reg_pending_beacons, list) {
1810                         list_del(&reg_beacon->list);
1811                         kfree(reg_beacon);
1812                 }
1813         }
1814         spin_unlock_bh(&reg_pending_beacons_lock);
1815
1816         if (!list_empty(&reg_beacon_list)) {
1817                 list_for_each_entry_safe(reg_beacon, btmp,
1818                                          &reg_beacon_list, list) {
1819                         list_del(&reg_beacon->list);
1820                         kfree(reg_beacon);
1821                 }
1822         }
1823
1824         /* First restore to the basic regulatory settings */
1825         cfg80211_regdomain = cfg80211_world_regdom;
1826
1827         mutex_unlock(&reg_mutex);
1828         mutex_unlock(&cfg80211_mutex);
1829
1830         regulatory_hint_core(cfg80211_regdomain->alpha2);
1831
1832         /*
1833          * This restores the ieee80211_regdom module parameter
1834          * preference or the last user requested regulatory
1835          * settings, user regulatory settings takes precedence.
1836          */
1837         if (is_an_alpha2(alpha2))
1838                 regulatory_hint_user(user_alpha2);
1839
1840         if (list_empty(&tmp_reg_req_list))
1841                 return;
1842
1843         mutex_lock(&cfg80211_mutex);
1844         mutex_lock(&reg_mutex);
1845
1846         spin_lock(&reg_requests_lock);
1847         list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) {
1848                 REG_DBG_PRINT("Adding request for country %c%c back "
1849                               "into the queue\n",
1850                               reg_request->alpha2[0],
1851                               reg_request->alpha2[1]);
1852                 list_del(&reg_request->list);
1853                 list_add_tail(&reg_request->list, &reg_requests_list);
1854         }
1855         spin_unlock(&reg_requests_lock);
1856
1857         mutex_unlock(&reg_mutex);
1858         mutex_unlock(&cfg80211_mutex);
1859
1860         REG_DBG_PRINT("Kicking the queue\n");
1861
1862         schedule_work(&reg_work);
1863 }
1864
1865 void regulatory_hint_disconnect(void)
1866 {
1867         REG_DBG_PRINT("All devices are disconnected, going to "
1868                       "restore regulatory settings\n");
1869         restore_regulatory_settings(false);
1870 }
1871
1872 static bool freq_is_chan_12_13_14(u16 freq)
1873 {
1874         if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
1875             freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
1876             freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
1877                 return true;
1878         return false;
1879 }
1880
1881 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1882                                  struct ieee80211_channel *beacon_chan,
1883                                  gfp_t gfp)
1884 {
1885         struct reg_beacon *reg_beacon;
1886
1887         if (likely((beacon_chan->beacon_found ||
1888             (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1889             (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1890              !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1891                 return 0;
1892
1893         reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1894         if (!reg_beacon)
1895                 return -ENOMEM;
1896
1897         REG_DBG_PRINT("Found new beacon on "
1898                       "frequency: %d MHz (Ch %d) on %s\n",
1899                       beacon_chan->center_freq,
1900                       ieee80211_frequency_to_channel(beacon_chan->center_freq),
1901                       wiphy_name(wiphy));
1902
1903         memcpy(&reg_beacon->chan, beacon_chan,
1904                 sizeof(struct ieee80211_channel));
1905
1906
1907         /*
1908          * Since we can be called from BH or and non-BH context
1909          * we must use spin_lock_bh()
1910          */
1911         spin_lock_bh(&reg_pending_beacons_lock);
1912         list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1913         spin_unlock_bh(&reg_pending_beacons_lock);
1914
1915         schedule_work(&reg_work);
1916
1917         return 0;
1918 }
1919
1920 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1921 {
1922         unsigned int i;
1923         const struct ieee80211_reg_rule *reg_rule = NULL;
1924         const struct ieee80211_freq_range *freq_range = NULL;
1925         const struct ieee80211_power_rule *power_rule = NULL;
1926
1927         pr_info("    (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
1928
1929         for (i = 0; i < rd->n_reg_rules; i++) {
1930                 reg_rule = &rd->reg_rules[i];
1931                 freq_range = &reg_rule->freq_range;
1932                 power_rule = &reg_rule->power_rule;
1933
1934                 /*
1935                  * There may not be documentation for max antenna gain
1936                  * in certain regions
1937                  */
1938                 if (power_rule->max_antenna_gain)
1939                         pr_info("    (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
1940                                 freq_range->start_freq_khz,
1941                                 freq_range->end_freq_khz,
1942                                 freq_range->max_bandwidth_khz,
1943                                 power_rule->max_antenna_gain,
1944                                 power_rule->max_eirp);
1945                 else
1946                         pr_info("    (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
1947                                 freq_range->start_freq_khz,
1948                                 freq_range->end_freq_khz,
1949                                 freq_range->max_bandwidth_khz,
1950                                 power_rule->max_eirp);
1951         }
1952 }
1953
1954 static void print_regdomain(const struct ieee80211_regdomain *rd)
1955 {
1956
1957         if (is_intersected_alpha2(rd->alpha2)) {
1958
1959                 if (last_request->initiator ==
1960                     NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1961                         struct cfg80211_registered_device *rdev;
1962                         rdev = cfg80211_rdev_by_wiphy_idx(
1963                                 last_request->wiphy_idx);
1964                         if (rdev) {
1965                                 pr_info("Current regulatory domain updated by AP to: %c%c\n",
1966                                         rdev->country_ie_alpha2[0],
1967                                         rdev->country_ie_alpha2[1]);
1968                         } else
1969                                 pr_info("Current regulatory domain intersected:\n");
1970                 } else
1971                         pr_info("Current regulatory domain intersected:\n");
1972         } else if (is_world_regdom(rd->alpha2))
1973                 pr_info("World regulatory domain updated:\n");
1974         else {
1975                 if (is_unknown_alpha2(rd->alpha2))
1976                         pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
1977                 else
1978                         pr_info("Regulatory domain changed to country: %c%c\n",
1979                                 rd->alpha2[0], rd->alpha2[1]);
1980         }
1981         print_rd_rules(rd);
1982 }
1983
1984 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1985 {
1986         pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
1987         print_rd_rules(rd);
1988 }
1989
1990 /* Takes ownership of rd only if it doesn't fail */
1991 static int __set_regdom(const struct ieee80211_regdomain *rd)
1992 {
1993         const struct ieee80211_regdomain *intersected_rd = NULL;
1994         struct cfg80211_registered_device *rdev = NULL;
1995         struct wiphy *request_wiphy;
1996         /* Some basic sanity checks first */
1997
1998         if (is_world_regdom(rd->alpha2)) {
1999                 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2000                         return -EINVAL;
2001                 update_world_regdomain(rd);
2002                 return 0;
2003         }
2004
2005         if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2006                         !is_unknown_alpha2(rd->alpha2))
2007                 return -EINVAL;
2008
2009         if (!last_request)
2010                 return -EINVAL;
2011
2012         /*
2013          * Lets only bother proceeding on the same alpha2 if the current
2014          * rd is non static (it means CRDA was present and was used last)
2015          * and the pending request came in from a country IE
2016          */
2017         if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2018                 /*
2019                  * If someone else asked us to change the rd lets only bother
2020                  * checking if the alpha2 changes if CRDA was already called
2021                  */
2022                 if (!regdom_changes(rd->alpha2))
2023                         return -EINVAL;
2024         }
2025
2026         /*
2027          * Now lets set the regulatory domain, update all driver channels
2028          * and finally inform them of what we have done, in case they want
2029          * to review or adjust their own settings based on their own
2030          * internal EEPROM data
2031          */
2032
2033         if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2034                 return -EINVAL;
2035
2036         if (!is_valid_rd(rd)) {
2037                 pr_err("Invalid regulatory domain detected:\n");
2038                 print_regdomain_info(rd);
2039                 return -EINVAL;
2040         }
2041
2042         request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2043         if (!request_wiphy &&
2044             (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2045              last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) {
2046                 schedule_delayed_work(&reg_timeout, 0);
2047                 return -ENODEV;
2048         }
2049
2050         if (!last_request->intersect) {
2051                 int r;
2052
2053                 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
2054                         reset_regdomains(false);
2055                         cfg80211_regdomain = rd;
2056                         return 0;
2057                 }
2058
2059                 /*
2060                  * For a driver hint, lets copy the regulatory domain the
2061                  * driver wanted to the wiphy to deal with conflicts
2062                  */
2063
2064                 /*
2065                  * Userspace could have sent two replies with only
2066                  * one kernel request.
2067                  */
2068                 if (request_wiphy->regd)
2069                         return -EALREADY;
2070
2071                 r = reg_copy_regd(&request_wiphy->regd, rd);
2072                 if (r)
2073                         return r;
2074
2075                 reset_regdomains(false);
2076                 cfg80211_regdomain = rd;
2077                 return 0;
2078         }
2079
2080         /* Intersection requires a bit more work */
2081
2082         if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2083
2084                 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2085                 if (!intersected_rd)
2086                         return -EINVAL;
2087
2088                 /*
2089                  * We can trash what CRDA provided now.
2090                  * However if a driver requested this specific regulatory
2091                  * domain we keep it for its private use
2092                  */
2093                 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
2094                         request_wiphy->regd = rd;
2095                 else
2096                         kfree(rd);
2097
2098                 rd = NULL;
2099
2100                 reset_regdomains(false);
2101                 cfg80211_regdomain = intersected_rd;
2102
2103                 return 0;
2104         }
2105
2106         if (!intersected_rd)
2107                 return -EINVAL;
2108
2109         rdev = wiphy_to_dev(request_wiphy);
2110
2111         rdev->country_ie_alpha2[0] = rd->alpha2[0];
2112         rdev->country_ie_alpha2[1] = rd->alpha2[1];
2113         rdev->env = last_request->country_ie_env;
2114
2115         BUG_ON(intersected_rd == rd);
2116
2117         kfree(rd);
2118         rd = NULL;
2119
2120         reset_regdomains(false);
2121         cfg80211_regdomain = intersected_rd;
2122
2123         return 0;
2124 }
2125
2126
2127 /*
2128  * Use this call to set the current regulatory domain. Conflicts with
2129  * multiple drivers can be ironed out later. Caller must've already
2130  * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2131  */
2132 int set_regdom(const struct ieee80211_regdomain *rd)
2133 {
2134         int r;
2135
2136         assert_cfg80211_lock();
2137
2138         mutex_lock(&reg_mutex);
2139
2140         /* Note that this doesn't update the wiphys, this is done below */
2141         r = __set_regdom(rd);
2142         if (r) {
2143                 kfree(rd);
2144                 mutex_unlock(&reg_mutex);
2145                 return r;
2146         }
2147
2148         /* This would make this whole thing pointless */
2149         if (!last_request->intersect)
2150                 BUG_ON(rd != cfg80211_regdomain);
2151
2152         /* update all wiphys now with the new established regulatory domain */
2153         update_all_wiphy_regulatory(last_request->initiator);
2154
2155         print_regdomain(cfg80211_regdomain);
2156
2157         nl80211_send_reg_change_event(last_request);
2158
2159         reg_set_request_processed();
2160
2161         mutex_unlock(&reg_mutex);
2162
2163         return r;
2164 }
2165
2166 #ifdef CONFIG_HOTPLUG
2167 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2168 {
2169         if (last_request && !last_request->processed) {
2170                 if (add_uevent_var(env, "COUNTRY=%c%c",
2171                                    last_request->alpha2[0],
2172                                    last_request->alpha2[1]))
2173                         return -ENOMEM;
2174         }
2175
2176         return 0;
2177 }
2178 #else
2179 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2180 {
2181         return -ENODEV;
2182 }
2183 #endif /* CONFIG_HOTPLUG */
2184
2185 /* Caller must hold cfg80211_mutex */
2186 void reg_device_remove(struct wiphy *wiphy)
2187 {
2188         struct wiphy *request_wiphy = NULL;
2189
2190         assert_cfg80211_lock();
2191
2192         mutex_lock(&reg_mutex);
2193
2194         kfree(wiphy->regd);
2195
2196         if (last_request)
2197                 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2198
2199         if (!request_wiphy || request_wiphy != wiphy)
2200                 goto out;
2201
2202         last_request->wiphy_idx = WIPHY_IDX_STALE;
2203         last_request->country_ie_env = ENVIRON_ANY;
2204 out:
2205         mutex_unlock(&reg_mutex);
2206 }
2207
2208 static void reg_timeout_work(struct work_struct *work)
2209 {
2210         REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "
2211                       "restoring regulatory settings");
2212         restore_regulatory_settings(true);
2213 }
2214
2215 int __init regulatory_init(void)
2216 {
2217         int err = 0;
2218
2219         reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2220         if (IS_ERR(reg_pdev))
2221                 return PTR_ERR(reg_pdev);
2222
2223         reg_pdev->dev.type = &reg_device_type;
2224
2225         spin_lock_init(&reg_requests_lock);
2226         spin_lock_init(&reg_pending_beacons_lock);
2227
2228         cfg80211_regdomain = cfg80211_world_regdom;
2229
2230         user_alpha2[0] = '9';
2231         user_alpha2[1] = '7';
2232
2233         /* We always try to get an update for the static regdomain */
2234         err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2235         if (err) {
2236                 if (err == -ENOMEM)
2237                         return err;
2238                 /*
2239                  * N.B. kobject_uevent_env() can fail mainly for when we're out
2240                  * memory which is handled and propagated appropriately above
2241                  * but it can also fail during a netlink_broadcast() or during
2242                  * early boot for call_usermodehelper(). For now treat these
2243                  * errors as non-fatal.
2244                  */
2245                 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2246 #ifdef CONFIG_CFG80211_REG_DEBUG
2247                 /* We want to find out exactly why when debugging */
2248                 WARN_ON(err);
2249 #endif
2250         }
2251
2252         /*
2253          * Finally, if the user set the module parameter treat it
2254          * as a user hint.
2255          */
2256         if (!is_world_regdom(ieee80211_regdom))
2257                 regulatory_hint_user(ieee80211_regdom);
2258
2259         return 0;
2260 }
2261
2262 void /* __init_or_exit */ regulatory_exit(void)
2263 {
2264         struct regulatory_request *reg_request, *tmp;
2265         struct reg_beacon *reg_beacon, *btmp;
2266
2267         cancel_work_sync(&reg_work);
2268         cancel_delayed_work_sync(&reg_timeout);
2269
2270         mutex_lock(&cfg80211_mutex);
2271         mutex_lock(&reg_mutex);
2272
2273         reset_regdomains(true);
2274
2275         dev_set_uevent_suppress(&reg_pdev->dev, true);
2276
2277         platform_device_unregister(reg_pdev);
2278
2279         spin_lock_bh(&reg_pending_beacons_lock);
2280         if (!list_empty(&reg_pending_beacons)) {
2281                 list_for_each_entry_safe(reg_beacon, btmp,
2282                                          &reg_pending_beacons, list) {
2283                         list_del(&reg_beacon->list);
2284                         kfree(reg_beacon);
2285                 }
2286         }
2287         spin_unlock_bh(&reg_pending_beacons_lock);
2288
2289         if (!list_empty(&reg_beacon_list)) {
2290                 list_for_each_entry_safe(reg_beacon, btmp,
2291                                          &reg_beacon_list, list) {
2292                         list_del(&reg_beacon->list);
2293                         kfree(reg_beacon);
2294                 }
2295         }
2296
2297         spin_lock(&reg_requests_lock);
2298         if (!list_empty(&reg_requests_list)) {
2299                 list_for_each_entry_safe(reg_request, tmp,
2300                                          &reg_requests_list, list) {
2301                         list_del(&reg_request->list);
2302                         kfree(reg_request);
2303                 }
2304         }
2305         spin_unlock(&reg_requests_lock);
2306
2307         mutex_unlock(&reg_mutex);
2308         mutex_unlock(&cfg80211_mutex);
2309 }