SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/wireless/reg.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2008       Luis R. Rodriguez <lrodriguz@atheros.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 /**
  13  * DOC: Wireless regulatory infrastructure
  14  *
  15  * The usual implementation is for a driver to read a device EEPROM to
  16  * determine which regulatory domain it should be operating under, then
  17  * looking up the allowable channels in a driver-local table and finally
  18  * registering those channels in the wiphy structure.
  19  *
  20  * Another set of compliance enforcement is for drivers to use their
  21  * own compliance limits which can be stored on the EEPROM. The host
  22  * driver or firmware may ensure these are used.
  23  *
  24  * In addition to all this we provide an extra layer of regulatory
  25  * conformance. For drivers which do not have any regulatory
  26  * information CRDA provides the complete regulatory solution.
  27  * For others it provides a community effort on further restrictions
  28  * to enhance compliance.
  29  *
  30  * Note: When number of rules --> infinity we will not be able to
  31  * index on alpha2 any more, instead we'll probably have to
  32  * rely on some SHA1 checksum of the regdomain for example.
  33  *
  34  */
  35 #include <linux/kernel.h>
  36 #include <linux/list.h>
  37 #include <linux/random.h>
  38 #include <linux/nl80211.h>
  39 #include <linux/platform_device.h>
  40 #include <net/wireless.h>
  41 #include <net/cfg80211.h>
  42 #include "core.h"
  43 #include "reg.h"
  44
  45 /* Receipt of information from last regulatory request */
  46 static struct regulatory_request *last_request;
  47
  48 /* To trigger userspace events */
  49 static struct platform_device *reg_pdev;
  50
  51 /* Keep the ordering from large to small */
  52 static u32 supported_bandwidths[] = {
  53         MHZ_TO_KHZ(40),
  54         MHZ_TO_KHZ(20),
  55 };
  56
  57 /*
  58  * Central wireless core regulatory domains, we only need two,
  59  * the current one and a world regulatory domain in case we have no
  60  * information to give us an alpha2
  61  */
  62 const struct ieee80211_regdomain *cfg80211_regdomain;
  63
  64 /*
  65  * We use this as a place for the rd structure built from the
  66  * last parsed country IE to rest until CRDA gets back to us with
  67  * what it thinks should apply for the same country
  68  */
  69 static const struct ieee80211_regdomain *country_ie_regdomain;
  70
  71 /* Used to queue up regulatory hints */
  72 static LIST_HEAD(reg_requests_list);
  73 static spinlock_t reg_requests_lock;
  74
  75 /* Used to queue up beacon hints for review */
  76 static LIST_HEAD(reg_pending_beacons);
  77 static spinlock_t reg_pending_beacons_lock;
  78
  79 /* Used to keep track of processed beacon hints */
  80 static LIST_HEAD(reg_beacon_list);
  81
  82 struct reg_beacon {
  83         struct list_head list;
  84         struct ieee80211_channel chan;
  85 };
  86
  87 /* We keep a static world regulatory domain in case of the absence of CRDA */
  88 static const struct ieee80211_regdomain world_regdom = {
  89         .n_reg_rules = 5,
  90         .alpha2 =  "00",
  91         .reg_rules = {
  92                 /* IEEE 802.11b/g, channels 1..11 */
  93                 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
  94                 /* IEEE 802.11b/g, channels 12..13. No HT40
  95                  * channel fits here. */
  96                 REG_RULE(2467-10, 2472+10, 20, 6, 20,
  97                         NL80211_RRF_PASSIVE_SCAN |
  98                         NL80211_RRF_NO_IBSS),
  99                 /* IEEE 802.11 channel 14 - Only JP enables
 100                  * this and for 802.11b only */
 101                 REG_RULE(2484-10, 2484+10, 20, 6, 20,
 102                         NL80211_RRF_PASSIVE_SCAN |
 103                         NL80211_RRF_NO_IBSS |
 104                         NL80211_RRF_NO_OFDM),
 105                 /* IEEE 802.11a, channel 36..48 */
 106                 REG_RULE(5180-10, 5240+10, 40, 6, 20,
 107                         NL80211_RRF_PASSIVE_SCAN |
 108                         NL80211_RRF_NO_IBSS),
 109
 110                 /* NB: 5260 MHz - 5700 MHz requies DFS */
 111
 112                 /* IEEE 802.11a, channel 149..165 */
 113                 REG_RULE(5745-10, 5825+10, 40, 6, 20,
 114                         NL80211_RRF_PASSIVE_SCAN |
 115                         NL80211_RRF_NO_IBSS),
 116         }
 117 };
 118
 119 static const struct ieee80211_regdomain *cfg80211_world_regdom =
 120         &world_regdom;
 121
 122 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
 123 static char *ieee80211_regdom = "US";
 124 module_param(ieee80211_regdom, charp, 0444);
 125 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
 126
 127 /*
 128  * We assume 40 MHz bandwidth for the old regulatory work.
 129  * We make emphasis we are using the exact same frequencies
 130  * as before
 131  */
 132
 133 static const struct ieee80211_regdomain us_regdom = {
 134         .n_reg_rules = 6,
 135         .alpha2 =  "US",
 136         .reg_rules = {
 137                 /* IEEE 802.11b/g, channels 1..11 */
 138                 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
 139                 /* IEEE 802.11a, channel 36 */
 140                 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
 141                 /* IEEE 802.11a, channel 40 */
 142                 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
 143                 /* IEEE 802.11a, channel 44 */
 144                 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
 145                 /* IEEE 802.11a, channels 48..64 */
 146                 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
 147                 /* IEEE 802.11a, channels 149..165, outdoor */
 148                 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
 149         }
 150 };
 151
 152 static const struct ieee80211_regdomain jp_regdom = {
 153         .n_reg_rules = 3,
 154         .alpha2 =  "JP",
 155         .reg_rules = {
 156                 /* IEEE 802.11b/g, channels 1..14 */
 157                 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
 158                 /* IEEE 802.11a, channels 34..48 */
 159                 REG_RULE(5170-10, 5240+10, 40, 6, 20,
 160                         NL80211_RRF_PASSIVE_SCAN),
 161                 /* IEEE 802.11a, channels 52..64 */
 162                 REG_RULE(5260-10, 5320+10, 40, 6, 20,
 163                         NL80211_RRF_NO_IBSS |
 164                         NL80211_RRF_DFS),
 165         }
 166 };
 167
 168 static const struct ieee80211_regdomain eu_regdom = {
 169         .n_reg_rules = 6,
 170         /*
 171          * This alpha2 is bogus, we leave it here just for stupid
 172          * backward compatibility
 173          */
 174         .alpha2 =  "EU",
 175         .reg_rules = {
 176                 /* IEEE 802.11b/g, channels 1..13 */
 177                 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
 178                 /* IEEE 802.11a, channel 36 */
 179                 REG_RULE(5180-10, 5180+10, 40, 6, 23,
 180                         NL80211_RRF_PASSIVE_SCAN),
 181                 /* IEEE 802.11a, channel 40 */
 182                 REG_RULE(5200-10, 5200+10, 40, 6, 23,
 183                         NL80211_RRF_PASSIVE_SCAN),
 184                 /* IEEE 802.11a, channel 44 */
 185                 REG_RULE(5220-10, 5220+10, 40, 6, 23,
 186                         NL80211_RRF_PASSIVE_SCAN),
 187                 /* IEEE 802.11a, channels 48..64 */
 188                 REG_RULE(5240-10, 5320+10, 40, 6, 20,
 189                         NL80211_RRF_NO_IBSS |
 190                         NL80211_RRF_DFS),
 191                 /* IEEE 802.11a, channels 100..140 */
 192                 REG_RULE(5500-10, 5700+10, 40, 6, 30,
 193                         NL80211_RRF_NO_IBSS |
 194                         NL80211_RRF_DFS),
 195         }
 196 };
 197
 198 static const struct ieee80211_regdomain *static_regdom(char *alpha2)
 199 {
 200         if (alpha2[0] == 'U' && alpha2[1] == 'S')
 201                 return &us_regdom;
 202         if (alpha2[0] == 'J' && alpha2[1] == 'P')
 203                 return &jp_regdom;
 204         if (alpha2[0] == 'E' && alpha2[1] == 'U')
 205                 return &eu_regdom;
 206         /* Default, as per the old rules */
 207         return &us_regdom;
 208 }
 209
 210 static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
 211 {
 212         if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
 213                 return true;
 214         return false;
 215 }
 216 #else
 217 static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
 218 {
 219         return false;
 220 }
 221 #endif
 222
 223 static void reset_regdomains(void)
 224 {
 225         /* avoid freeing static information or freeing something twice */
 226         if (cfg80211_regdomain == cfg80211_world_regdom)
 227                 cfg80211_regdomain = NULL;
 228         if (cfg80211_world_regdom == &world_regdom)
 229                 cfg80211_world_regdom = NULL;
 230         if (cfg80211_regdomain == &world_regdom)
 231                 cfg80211_regdomain = NULL;
 232         if (is_old_static_regdom(cfg80211_regdomain))
 233                 cfg80211_regdomain = NULL;
 234
 235         kfree(cfg80211_regdomain);
 236         kfree(cfg80211_world_regdom);
 237
 238         cfg80211_world_regdom = &world_regdom;
 239         cfg80211_regdomain = NULL;
 240 }
 241
 242 /*
 243  * Dynamic world regulatory domain requested by the wireless
 244  * core upon initialization
 245  */
 246 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
 247 {
 248         BUG_ON(!last_request);
 249
 250         reset_regdomains();
 251
 252         cfg80211_world_regdom = rd;
 253         cfg80211_regdomain = rd;
 254 }
 255
 256 bool is_world_regdom(const char *alpha2)
 257 {
 258         if (!alpha2)
 259                 return false;
 260         if (alpha2[0] == '0' && alpha2[1] == '0')
 261                 return true;
 262         return false;
 263 }
 264
 265 static bool is_alpha2_set(const char *alpha2)
 266 {
 267         if (!alpha2)
 268                 return false;
 269         if (alpha2[0] != 0 && alpha2[1] != 0)
 270                 return true;
 271         return false;
 272 }
 273
 274 static bool is_alpha_upper(char letter)
 275 {
 276         /* ASCII A - Z */
 277         if (letter >= 65 && letter <= 90)
 278                 return true;
 279         return false;
 280 }
 281
 282 static bool is_unknown_alpha2(const char *alpha2)
 283 {
 284         if (!alpha2)
 285                 return false;
 286         /*
 287          * Special case where regulatory domain was built by driver
 288          * but a specific alpha2 cannot be determined
 289          */
 290         if (alpha2[0] == '9' && alpha2[1] == '9')
 291                 return true;
 292         return false;
 293 }
 294
 295 static bool is_intersected_alpha2(const char *alpha2)
 296 {
 297         if (!alpha2)
 298                 return false;
 299         /*
 300          * Special case where regulatory domain is the
 301          * result of an intersection between two regulatory domain
 302          * structures
 303          */
 304         if (alpha2[0] == '9' && alpha2[1] == '8')
 305                 return true;
 306         return false;
 307 }
 308
 309 static bool is_an_alpha2(const char *alpha2)
 310 {
 311         if (!alpha2)
 312                 return false;
 313         if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
 314                 return true;
 315         return false;
 316 }
 317
 318 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
 319 {
 320         if (!alpha2_x || !alpha2_y)
 321                 return false;
 322         if (alpha2_x[0] == alpha2_y[0] &&
 323                 alpha2_x[1] == alpha2_y[1])
 324                 return true;
 325         return false;
 326 }
 327
 328 static bool regdom_changes(const char *alpha2)
 329 {
 330         assert_cfg80211_lock();
 331
 332         if (!cfg80211_regdomain)
 333                 return true;
 334         if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
 335                 return false;
 336         return true;
 337 }
 338
 339 /**
 340  * country_ie_integrity_changes - tells us if the country IE has changed
 341  * @checksum: checksum of country IE of fields we are interested in
 342  *
 343  * If the country IE has not changed you can ignore it safely. This is
 344  * useful to determine if two devices are seeing two different country IEs
 345  * even on the same alpha2. Note that this will return false if no IE has
 346  * been set on the wireless core yet.
 347  */
 348 static bool country_ie_integrity_changes(u32 checksum)
 349 {
 350         /* If no IE has been set then the checksum doesn't change */
 351         if (unlikely(!last_request->country_ie_checksum))
 352                 return false;
 353         if (unlikely(last_request->country_ie_checksum != checksum))
 354                 return true;
 355         return false;
 356 }
 357
 358 /*
 359  * This lets us keep regulatory code which is updated on a regulatory
 360  * basis in userspace.
 361  */
 362 static int call_crda(const char *alpha2)
 363 {
 364         char country_env[9 + 2] = "COUNTRY=";
 365         char *envp[] = {
 366                 country_env,
 367                 NULL
 368         };
 369
 370         if (!is_world_regdom((char *) alpha2))
 371                 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
 372                         alpha2[0], alpha2[1]);
 373         else
 374                 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
 375                         "regulatory domain\n");
 376
 377         country_env[8] = alpha2[0];
 378         country_env[9] = alpha2[1];
 379
 380         return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
 381 }
 382
 383 /* Used by nl80211 before kmalloc'ing our regulatory domain */
 384 bool reg_is_valid_request(const char *alpha2)
 385 {
 386         if (!last_request)
 387                 return false;
 388
 389         return alpha2_equal(last_request->alpha2, alpha2);
 390 }
 391
 392 /* Sanity check on a regulatory rule */
 393 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
 394 {
 395         const struct ieee80211_freq_range *freq_range = &rule->freq_range;
 396         u32 freq_diff;
 397
 398         if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
 399                 return false;
 400
 401         if (freq_range->start_freq_khz > freq_range->end_freq_khz)
 402                 return false;
 403
 404         freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 405
 406         if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
 407                         freq_range->max_bandwidth_khz > freq_diff)
 408                 return false;
 409
 410         return true;
 411 }
 412
 413 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
 414 {
 415         const struct ieee80211_reg_rule *reg_rule = NULL;
 416         unsigned int i;
 417
 418         if (!rd->n_reg_rules)
 419                 return false;
 420
 421         if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
 422                 return false;
 423
 424         for (i = 0; i < rd->n_reg_rules; i++) {
 425                 reg_rule = &rd->reg_rules[i];
 426                 if (!is_valid_reg_rule(reg_rule))
 427                         return false;
 428         }
 429
 430         return true;
 431 }
 432
 433 /* Returns value in KHz */
 434 static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
 435         u32 freq)
 436 {
 437         unsigned int i;
 438         for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
 439                 u32 start_freq_khz = freq - supported_bandwidths[i]/2;
 440                 u32 end_freq_khz = freq + supported_bandwidths[i]/2;
 441                 if (start_freq_khz >= freq_range->start_freq_khz &&
 442                         end_freq_khz <= freq_range->end_freq_khz)
 443                         return supported_bandwidths[i];
 444         }
 445         return 0;
 446 }
 447
 448 /**
 449  * freq_in_rule_band - tells us if a frequency is in a frequency band
 450  * @freq_range: frequency rule we want to query
 451  * @freq_khz: frequency we are inquiring about
 452  *
 453  * This lets us know if a specific frequency rule is or is not relevant to
 454  * a specific frequency's band. Bands are device specific and artificial
 455  * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
 456  * safe for now to assume that a frequency rule should not be part of a
 457  * frequency's band if the start freq or end freq are off by more than 2 GHz.
 458  * This resolution can be lowered and should be considered as we add
 459  * regulatory rule support for other "bands".
 460  **/
 461 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
 462         u32 freq_khz)
 463 {
 464 #define ONE_GHZ_IN_KHZ  1000000
 465         if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
 466                 return true;
 467         if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
 468                 return true;
 469         return false;
 470 #undef ONE_GHZ_IN_KHZ
 471 }
 472
 473 /*
 474  * Converts a country IE to a regulatory domain. A regulatory domain
 475  * structure has a lot of information which the IE doesn't yet have,
 476  * so for the other values we use upper max values as we will intersect
 477  * with our userspace regulatory agent to get lower bounds.
 478  */
 479 static struct ieee80211_regdomain *country_ie_2_rd(
 480                                 u8 *country_ie,
 481                                 u8 country_ie_len,
 482                                 u32 *checksum)
 483 {
 484         struct ieee80211_regdomain *rd = NULL;
 485         unsigned int i = 0;
 486         char alpha2[2];
 487         u32 flags = 0;
 488         u32 num_rules = 0, size_of_regd = 0;
 489         u8 *triplets_start = NULL;
 490         u8 len_at_triplet = 0;
 491         /* the last channel we have registered in a subband (triplet) */
 492         int last_sub_max_channel = 0;
 493
 494         *checksum = 0xDEADBEEF;
 495
 496         /* Country IE requirements */
 497         BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
 498                 country_ie_len & 0x01);
 499
 500         alpha2[0] = country_ie[0];
 501         alpha2[1] = country_ie[1];
 502
 503         /*
 504          * Third octet can be:
 505          *    'I' - Indoor
 506          *    'O' - Outdoor
 507          *
 508          *  anything else we assume is no restrictions
 509          */
 510         if (country_ie[2] == 'I')
 511                 flags = NL80211_RRF_NO_OUTDOOR;
 512         else if (country_ie[2] == 'O')
 513                 flags = NL80211_RRF_NO_INDOOR;
 514
 515         country_ie += 3;
 516         country_ie_len -= 3;
 517
 518         triplets_start = country_ie;
 519         len_at_triplet = country_ie_len;
 520
 521         *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
 522
 523         /*
 524          * We need to build a reg rule for each triplet, but first we must
 525          * calculate the number of reg rules we will need. We will need one
 526          * for each channel subband
 527          */
 528         while (country_ie_len >= 3) {
 529                 int end_channel = 0;
 530                 struct ieee80211_country_ie_triplet *triplet =
 531                         (struct ieee80211_country_ie_triplet *) country_ie;
 532                 int cur_sub_max_channel = 0, cur_channel = 0;
 533
 534                 if (triplet->ext.reg_extension_id >=
 535                                 IEEE80211_COUNTRY_EXTENSION_ID) {
 536                         country_ie += 3;
 537                         country_ie_len -= 3;
 538                         continue;
 539                 }
 540
 541                 /* 2 GHz */
 542                 if (triplet->chans.first_channel <= 14)
 543                         end_channel = triplet->chans.first_channel +
 544                                 triplet->chans.num_channels;
 545                 else
 546                         /*
 547                          * 5 GHz -- For example in country IEs if the first
 548                          * channel given is 36 and the number of channels is 4
 549                          * then the individual channel numbers defined for the
 550                          * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
 551                          * and not 36, 37, 38, 39.
 552                          *
 553                          * See: http://tinyurl.com/11d-clarification
 554                          */
 555                         end_channel =  triplet->chans.first_channel +
 556                                 (4 * (triplet->chans.num_channels - 1));
 557
 558                 cur_channel = triplet->chans.first_channel;
 559                 cur_sub_max_channel = end_channel;
 560
 561                 /* Basic sanity check */
 562                 if (cur_sub_max_channel < cur_channel)
 563                         return NULL;
 564
 565                 /*
 566                  * Do not allow overlapping channels. Also channels
 567                  * passed in each subband must be monotonically
 568                  * increasing
 569                  */
 570                 if (last_sub_max_channel) {
 571                         if (cur_channel <= last_sub_max_channel)
 572                                 return NULL;
 573                         if (cur_sub_max_channel <= last_sub_max_channel)
 574                                 return NULL;
 575                 }
 576
 577                 /*
 578                  * When dot11RegulatoryClassesRequired is supported
 579                  * we can throw ext triplets as part of this soup,
 580                  * for now we don't care when those change as we
 581                  * don't support them
 582                  */
 583                 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
 584                   ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
 585                   ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
 586
 587                 last_sub_max_channel = cur_sub_max_channel;
 588
 589                 country_ie += 3;
 590                 country_ie_len -= 3;
 591                 num_rules++;
 592
 593                 /*
 594                  * Note: this is not a IEEE requirement but
 595                  * simply a memory requirement
 596                  */
 597                 if (num_rules > NL80211_MAX_SUPP_REG_RULES)
 598                         return NULL;
 599         }
 600
 601         country_ie = triplets_start;
 602         country_ie_len = len_at_triplet;
 603
 604         size_of_regd = sizeof(struct ieee80211_regdomain) +
 605                 (num_rules * sizeof(struct ieee80211_reg_rule));
 606
 607         rd = kzalloc(size_of_regd, GFP_KERNEL);
 608         if (!rd)
 609                 return NULL;
 610
 611         rd->n_reg_rules = num_rules;
 612         rd->alpha2[0] = alpha2[0];
 613         rd->alpha2[1] = alpha2[1];
 614
 615         /* This time around we fill in the rd */
 616         while (country_ie_len >= 3) {
 617                 int end_channel = 0;
 618                 struct ieee80211_country_ie_triplet *triplet =
 619                         (struct ieee80211_country_ie_triplet *) country_ie;
 620                 struct ieee80211_reg_rule *reg_rule = NULL;
 621                 struct ieee80211_freq_range *freq_range = NULL;
 622                 struct ieee80211_power_rule *power_rule = NULL;
 623
 624                 /*
 625                  * Must parse if dot11RegulatoryClassesRequired is true,
 626                  * we don't support this yet
 627                  */
 628                 if (triplet->ext.reg_extension_id >=
 629                                 IEEE80211_COUNTRY_EXTENSION_ID) {
 630                         country_ie += 3;
 631                         country_ie_len -= 3;
 632                         continue;
 633                 }
 634
 635                 reg_rule = &rd->reg_rules[i];
 636                 freq_range = &reg_rule->freq_range;
 637                 power_rule = &reg_rule->power_rule;
 638
 639                 reg_rule->flags = flags;
 640
 641                 /* 2 GHz */
 642                 if (triplet->chans.first_channel <= 14)
 643                         end_channel = triplet->chans.first_channel +
 644                                 triplet->chans.num_channels;
 645                 else
 646                         end_channel =  triplet->chans.first_channel +
 647                                 (4 * (triplet->chans.num_channels - 1));
 648
 649                 /*
 650                  * The +10 is since the regulatory domain expects
 651                  * the actual band edge, not the center of freq for
 652                  * its start and end freqs, assuming 20 MHz bandwidth on
 653                  * the channels passed
 654                  */
 655                 freq_range->start_freq_khz =
 656                         MHZ_TO_KHZ(ieee80211_channel_to_frequency(
 657                                 triplet->chans.first_channel) - 10);
 658                 freq_range->end_freq_khz =
 659                         MHZ_TO_KHZ(ieee80211_channel_to_frequency(
 660                                 end_channel) + 10);
 661
 662                 /*
 663                  * These are large arbitrary values we use to intersect later.
 664                  * Increment this if we ever support >= 40 MHz channels
 665                  * in IEEE 802.11
 666                  */
 667                 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
 668                 power_rule->max_antenna_gain = DBI_TO_MBI(100);
 669                 power_rule->max_eirp = DBM_TO_MBM(100);
 670
 671                 country_ie += 3;
 672                 country_ie_len -= 3;
 673                 i++;
 674
 675                 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
 676         }
 677
 678         return rd;
 679 }
 680
 681
 682 /*
 683  * Helper for regdom_intersect(), this does the real
 684  * mathematical intersection fun
 685  */
 686 static int reg_rules_intersect(
 687         const struct ieee80211_reg_rule *rule1,
 688         const struct ieee80211_reg_rule *rule2,
 689         struct ieee80211_reg_rule *intersected_rule)
 690 {
 691         const struct ieee80211_freq_range *freq_range1, *freq_range2;
 692         struct ieee80211_freq_range *freq_range;
 693         const struct ieee80211_power_rule *power_rule1, *power_rule2;
 694         struct ieee80211_power_rule *power_rule;
 695         u32 freq_diff;
 696
 697         freq_range1 = &rule1->freq_range;
 698         freq_range2 = &rule2->freq_range;
 699         freq_range = &intersected_rule->freq_range;
 700
 701         power_rule1 = &rule1->power_rule;
 702         power_rule2 = &rule2->power_rule;
 703         power_rule = &intersected_rule->power_rule;
 704
 705         freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
 706                 freq_range2->start_freq_khz);
 707         freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
 708                 freq_range2->end_freq_khz);
 709         freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
 710                 freq_range2->max_bandwidth_khz);
 711
 712         freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 713         if (freq_range->max_bandwidth_khz > freq_diff)
 714                 freq_range->max_bandwidth_khz = freq_diff;
 715
 716         power_rule->max_eirp = min(power_rule1->max_eirp,
 717                 power_rule2->max_eirp);
 718         power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
 719                 power_rule2->max_antenna_gain);
 720
 721         intersected_rule->flags = (rule1->flags | rule2->flags);
 722
 723         if (!is_valid_reg_rule(intersected_rule))
 724                 return -EINVAL;
 725
 726         return 0;
 727 }
 728
 729 /**
 730  * regdom_intersect - do the intersection between two regulatory domains
 731  * @rd1: first regulatory domain
 732  * @rd2: second regulatory domain
 733  *
 734  * Use this function to get the intersection between two regulatory domains.
 735  * Once completed we will mark the alpha2 for the rd as intersected, "98",
 736  * as no one single alpha2 can represent this regulatory domain.
 737  *
 738  * Returns a pointer to the regulatory domain structure which will hold the
 739  * resulting intersection of rules between rd1 and rd2. We will
 740  * kzalloc() this structure for you.
 741  */
 742 static struct ieee80211_regdomain *regdom_intersect(
 743         const struct ieee80211_regdomain *rd1,
 744         const struct ieee80211_regdomain *rd2)
 745 {
 746         int r, size_of_regd;
 747         unsigned int x, y;
 748         unsigned int num_rules = 0, rule_idx = 0;
 749         const struct ieee80211_reg_rule *rule1, *rule2;
 750         struct ieee80211_reg_rule *intersected_rule;
 751         struct ieee80211_regdomain *rd;
 752         /* This is just a dummy holder to help us count */
 753         struct ieee80211_reg_rule irule;
 754
 755         /* Uses the stack temporarily for counter arithmetic */
 756         intersected_rule = &irule;
 757
 758         memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
 759
 760         if (!rd1 || !rd2)
 761                 return NULL;
 762
 763         /*
 764          * First we get a count of the rules we'll need, then we actually
 765          * build them. This is to so we can malloc() and free() a
 766          * regdomain once. The reason we use reg_rules_intersect() here
 767          * is it will return -EINVAL if the rule computed makes no sense.
 768          * All rules that do check out OK are valid.
 769          */
 770
 771         for (x = 0; x < rd1->n_reg_rules; x++) {
 772                 rule1 = &rd1->reg_rules[x];
 773                 for (y = 0; y < rd2->n_reg_rules; y++) {
 774                         rule2 = &rd2->reg_rules[y];
 775                         if (!reg_rules_intersect(rule1, rule2,
 776                                         intersected_rule))
 777                                 num_rules++;
 778                         memset(intersected_rule, 0,
 779                                         sizeof(struct ieee80211_reg_rule));
 780                 }
 781         }
 782
 783         if (!num_rules)
 784                 return NULL;
 785
 786         size_of_regd = sizeof(struct ieee80211_regdomain) +
 787                 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
 788
 789         rd = kzalloc(size_of_regd, GFP_KERNEL);
 790         if (!rd)
 791                 return NULL;
 792
 793         for (x = 0; x < rd1->n_reg_rules; x++) {
 794                 rule1 = &rd1->reg_rules[x];
 795                 for (y = 0; y < rd2->n_reg_rules; y++) {
 796                         rule2 = &rd2->reg_rules[y];
 797                         /*
 798                          * This time around instead of using the stack lets
 799                          * write to the target rule directly saving ourselves
 800                          * a memcpy()
 801                          */
 802                         intersected_rule = &rd->reg_rules[rule_idx];
 803                         r = reg_rules_intersect(rule1, rule2,
 804                                 intersected_rule);
 805                         /*
 806                          * No need to memset here the intersected rule here as
 807                          * we're not using the stack anymore
 808                          */
 809                         if (r)
 810                                 continue;
 811                         rule_idx++;
 812                 }
 813         }
 814
 815         if (rule_idx != num_rules) {
 816                 kfree(rd);
 817                 return NULL;
 818         }
 819
 820         rd->n_reg_rules = num_rules;
 821         rd->alpha2[0] = '9';
 822         rd->alpha2[1] = '8';
 823
 824         return rd;
 825 }
 826
 827 /*
 828  * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
 829  * want to just have the channel structure use these
 830  */
 831 static u32 map_regdom_flags(u32 rd_flags)
 832 {
 833         u32 channel_flags = 0;
 834         if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
 835                 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 836         if (rd_flags & NL80211_RRF_NO_IBSS)
 837                 channel_flags |= IEEE80211_CHAN_NO_IBSS;
 838         if (rd_flags & NL80211_RRF_DFS)
 839                 channel_flags |= IEEE80211_CHAN_RADAR;
 840         return channel_flags;
 841 }
 842
 843 static int freq_reg_info_regd(struct wiphy *wiphy,
 844                               u32 center_freq,
 845                               u32 *bandwidth,
 846                               const struct ieee80211_reg_rule **reg_rule,
 847                               const struct ieee80211_regdomain *custom_regd)
 848 {
 849         int i;
 850         bool band_rule_found = false;
 851         const struct ieee80211_regdomain *regd;
 852         u32 max_bandwidth = 0;
 853
 854         regd = custom_regd ? custom_regd : cfg80211_regdomain;
 855
 856         /*
 857          * Follow the driver's regulatory domain, if present, unless a country
 858          * IE has been processed or a user wants to help complaince further
 859          */
 860         if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
 861             last_request->initiator != REGDOM_SET_BY_USER &&
 862             wiphy->regd)
 863                 regd = wiphy->regd;
 864
 865         if (!regd)
 866                 return -EINVAL;
 867
 868         for (i = 0; i < regd->n_reg_rules; i++) {
 869                 const struct ieee80211_reg_rule *rr;
 870                 const struct ieee80211_freq_range *fr = NULL;
 871                 const struct ieee80211_power_rule *pr = NULL;
 872
 873                 rr = &regd->reg_rules[i];
 874                 fr = &rr->freq_range;
 875                 pr = &rr->power_rule;
 876
 877                 /*
 878                  * We only need to know if one frequency rule was
 879                  * was in center_freq's band, that's enough, so lets
 880                  * not overwrite it once found
 881                  */
 882                 if (!band_rule_found)
 883                         band_rule_found = freq_in_rule_band(fr, center_freq);
 884
 885                 max_bandwidth = freq_max_bandwidth(fr, center_freq);
 886
 887                 if (max_bandwidth && *bandwidth <= max_bandwidth) {
 888                         *reg_rule = rr;
 889                         *bandwidth = max_bandwidth;
 890                         break;
 891                 }
 892         }
 893
 894         if (!band_rule_found)
 895                 return -ERANGE;
 896
 897         return !max_bandwidth;
 898 }
 899 EXPORT_SYMBOL(freq_reg_info);
 900
 901 int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
 902                          const struct ieee80211_reg_rule **reg_rule)
 903 {
 904         return freq_reg_info_regd(wiphy, center_freq,
 905                 bandwidth, reg_rule, NULL);
 906 }
 907
 908 static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
 909                            unsigned int chan_idx)
 910 {
 911         int r;
 912         u32 flags;
 913         u32 max_bandwidth = 0;
 914         const struct ieee80211_reg_rule *reg_rule = NULL;
 915         const struct ieee80211_power_rule *power_rule = NULL;
 916         struct ieee80211_supported_band *sband;
 917         struct ieee80211_channel *chan;
 918         struct wiphy *request_wiphy = NULL;
 919
 920         assert_cfg80211_lock();
 921
 922         request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
 923
 924         sband = wiphy->bands[band];
 925         BUG_ON(chan_idx >= sband->n_channels);
 926         chan = &sband->channels[chan_idx];
 927
 928         flags = chan->orig_flags;
 929
 930         r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq),
 931                 &max_bandwidth, &reg_rule);
 932
 933         if (r) {
 934                 /*
 935                  * This means no regulatory rule was found in the country IE
 936                  * with a frequency range on the center_freq's band, since
 937                  * IEEE-802.11 allows for a country IE to have a subset of the
 938                  * regulatory information provided in a country we ignore
 939                  * disabling the channel unless at least one reg rule was
 940                  * found on the center_freq's band. For details see this
 941                  * clarification:
 942                  *
 943                  * http://tinyurl.com/11d-clarification
 944                  */
 945                 if (r == -ERANGE &&
 946                     last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
 947 #ifdef CONFIG_CFG80211_REG_DEBUG
 948                         printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
 949                                 "intact on %s - no rule found in band on "
 950                                 "Country IE\n",
 951                                 chan->center_freq, wiphy_name(wiphy));
 952 #endif
 953                 } else {
 954                 /*
 955                  * In this case we know the country IE has at least one reg rule
 956                  * for the band so we respect its band definitions
 957                  */
 958 #ifdef CONFIG_CFG80211_REG_DEBUG
 959                         if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
 960                                 printk(KERN_DEBUG "cfg80211: Disabling "
 961                                         "channel %d MHz on %s due to "
 962                                         "Country IE\n",
 963                                         chan->center_freq, wiphy_name(wiphy));
 964 #endif
 965                         flags |= IEEE80211_CHAN_DISABLED;
 966                         chan->flags = flags;
 967                 }
 968                 return;
 969         }
 970
 971         power_rule = &reg_rule->power_rule;
 972
 973         if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
 974             request_wiphy && request_wiphy == wiphy &&
 975             request_wiphy->strict_regulatory) {
 976                 /*
 977                  * This gaurantees the driver's requested regulatory domain
 978                  * will always be used as a base for further regulatory
 979                  * settings
 980                  */
 981                 chan->flags = chan->orig_flags =
 982                         map_regdom_flags(reg_rule->flags);
 983                 chan->max_antenna_gain = chan->orig_mag =
 984                         (int) MBI_TO_DBI(power_rule->max_antenna_gain);
 985                 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
 986                 chan->max_power = chan->orig_mpwr =
 987                         (int) MBM_TO_DBM(power_rule->max_eirp);
 988                 return;
 989         }
 990
 991         chan->flags = flags | map_regdom_flags(reg_rule->flags);
 992         chan->max_antenna_gain = min(chan->orig_mag,
 993                 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
 994         chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
 995         if (chan->orig_mpwr)
 996                 chan->max_power = min(chan->orig_mpwr,
 997                         (int) MBM_TO_DBM(power_rule->max_eirp));
 998         else
 999                 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1000 }
1001
1002 static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
1003 {
1004         unsigned int i;
1005         struct ieee80211_supported_band *sband;
1006
1007         BUG_ON(!wiphy->bands[band]);
1008         sband = wiphy->bands[band];
1009
1010         for (i = 0; i < sband->n_channels; i++)
1011                 handle_channel(wiphy, band, i);
1012 }
1013
1014 static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby)
1015 {
1016         if (!last_request)
1017                 return true;
1018         if (setby == REGDOM_SET_BY_CORE &&
1019                   wiphy->custom_regulatory)
1020                 return true;
1021         /*
1022          * wiphy->regd will be set once the device has its own
1023          * desired regulatory domain set
1024          */
1025         if (wiphy->strict_regulatory && !wiphy->regd &&
1026             !is_world_regdom(last_request->alpha2))
1027                 return true;
1028         return false;
1029 }
1030
1031 static void update_all_wiphy_regulatory(enum reg_set_by setby)
1032 {
1033         struct cfg80211_registered_device *drv;
1034
1035         list_for_each_entry(drv, &cfg80211_drv_list, list)
1036                 wiphy_update_regulatory(&drv->wiphy, setby);
1037 }
1038
1039 static void handle_reg_beacon(struct wiphy *wiphy,
1040                               unsigned int chan_idx,
1041                               struct reg_beacon *reg_beacon)
1042 {
1043 #ifdef CONFIG_CFG80211_REG_DEBUG
1044 #define REG_DEBUG_BEACON_FLAG(desc) \
1045         printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \
1046                 "frequency: %d MHz (Ch %d) on %s\n", \
1047                 reg_beacon->chan.center_freq, \
1048                 ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \
1049                 wiphy_name(wiphy));
1050 #else
1051 #define REG_DEBUG_BEACON_FLAG(desc) do {} while (0)
1052 #endif
1053         struct ieee80211_supported_band *sband;
1054         struct ieee80211_channel *chan;
1055
1056         assert_cfg80211_lock();
1057
1058         sband = wiphy->bands[reg_beacon->chan.band];
1059         chan = &sband->channels[chan_idx];
1060
1061         if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1062                 return;
1063
1064         if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
1065                 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
1066                 REG_DEBUG_BEACON_FLAG("active scanning");
1067         }
1068
1069         if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
1070                 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
1071                 REG_DEBUG_BEACON_FLAG("beaconing");
1072         }
1073
1074         chan->beacon_found = true;
1075 #undef REG_DEBUG_BEACON_FLAG
1076 }
1077
1078 /*
1079  * Called when a scan on a wiphy finds a beacon on
1080  * new channel
1081  */
1082 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1083                                     struct reg_beacon *reg_beacon)
1084 {
1085         unsigned int i;
1086         struct ieee80211_supported_band *sband;
1087
1088         assert_cfg80211_lock();
1089
1090         if (!wiphy->bands[reg_beacon->chan.band])
1091                 return;
1092
1093         sband = wiphy->bands[reg_beacon->chan.band];
1094
1095         for (i = 0; i < sband->n_channels; i++)
1096                 handle_reg_beacon(wiphy, i, reg_beacon);
1097 }
1098
1099 /*
1100  * Called upon reg changes or a new wiphy is added
1101  */
1102 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1103 {
1104         unsigned int i;
1105         struct ieee80211_supported_band *sband;
1106         struct reg_beacon *reg_beacon;
1107
1108         assert_cfg80211_lock();
1109
1110         if (list_empty(&reg_beacon_list))
1111                 return;
1112
1113         list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1114                 if (!wiphy->bands[reg_beacon->chan.band])
1115                         continue;
1116                 sband = wiphy->bands[reg_beacon->chan.band];
1117                 for (i = 0; i < sband->n_channels; i++)
1118                         handle_reg_beacon(wiphy, i, reg_beacon);
1119         }
1120 }
1121
1122 static bool reg_is_world_roaming(struct wiphy *wiphy)
1123 {
1124         if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1125             (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1126                 return true;
1127         if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
1128             wiphy->custom_regulatory)
1129                 return true;
1130         return false;
1131 }
1132
1133 /* Reap the advantages of previously found beacons */
1134 static void reg_process_beacons(struct wiphy *wiphy)
1135 {
1136         if (!reg_is_world_roaming(wiphy))
1137                 return;
1138         wiphy_update_beacon_reg(wiphy);
1139 }
1140
1141 void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
1142 {
1143         enum ieee80211_band band;
1144
1145         if (ignore_reg_update(wiphy, setby))
1146                 goto out;
1147         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1148                 if (wiphy->bands[band])
1149                         handle_band(wiphy, band);
1150         }
1151 out:
1152         reg_process_beacons(wiphy);
1153         if (wiphy->reg_notifier)
1154                 wiphy->reg_notifier(wiphy, last_request);
1155 }
1156
1157 static void handle_channel_custom(struct wiphy *wiphy,
1158                                   enum ieee80211_band band,
1159                                   unsigned int chan_idx,
1160                                   const struct ieee80211_regdomain *regd)
1161 {
1162         int r;
1163         u32 max_bandwidth = 0;
1164         const struct ieee80211_reg_rule *reg_rule = NULL;
1165         const struct ieee80211_power_rule *power_rule = NULL;
1166         struct ieee80211_supported_band *sband;
1167         struct ieee80211_channel *chan;
1168
1169         sband = wiphy->bands[band];
1170         BUG_ON(chan_idx >= sband->n_channels);
1171         chan = &sband->channels[chan_idx];
1172
1173         r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1174                 &max_bandwidth, &reg_rule, regd);
1175
1176         if (r) {
1177                 chan->flags = IEEE80211_CHAN_DISABLED;
1178                 return;
1179         }
1180
1181         power_rule = &reg_rule->power_rule;
1182
1183         chan->flags |= map_regdom_flags(reg_rule->flags);
1184         chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1185         chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
1186         chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1187 }
1188
1189 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1190                                const struct ieee80211_regdomain *regd)
1191 {
1192         unsigned int i;
1193         struct ieee80211_supported_band *sband;
1194
1195         BUG_ON(!wiphy->bands[band]);
1196         sband = wiphy->bands[band];
1197
1198         for (i = 0; i < sband->n_channels; i++)
1199                 handle_channel_custom(wiphy, band, i, regd);
1200 }
1201
1202 /* Used by drivers prior to wiphy registration */
1203 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1204                                    const struct ieee80211_regdomain *regd)
1205 {
1206         enum ieee80211_band band;
1207         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1208                 if (wiphy->bands[band])
1209                         handle_band_custom(wiphy, band, regd);
1210         }
1211 }
1212 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1213
1214 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
1215                          const struct ieee80211_regdomain *src_regd)
1216 {
1217         struct ieee80211_regdomain *regd;
1218         int size_of_regd = 0;
1219         unsigned int i;
1220
1221         size_of_regd = sizeof(struct ieee80211_regdomain) +
1222           ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
1223
1224         regd = kzalloc(size_of_regd, GFP_KERNEL);
1225         if (!regd)
1226                 return -ENOMEM;
1227
1228         memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
1229
1230         for (i = 0; i < src_regd->n_reg_rules; i++)
1231                 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
1232                         sizeof(struct ieee80211_reg_rule));
1233
1234         *dst_regd = regd;
1235         return 0;
1236 }
1237
1238 /*
1239  * Return value which can be used by ignore_request() to indicate
1240  * it has been determined we should intersect two regulatory domains
1241  */
1242 #define REG_INTERSECT   1
1243
1244 /* This has the logic which determines when a new request
1245  * should be ignored. */
1246 static int ignore_request(struct wiphy *wiphy,
1247                           struct regulatory_request *pending_request)
1248 {
1249         struct wiphy *last_wiphy = NULL;
1250
1251         assert_cfg80211_lock();
1252
1253         /* All initial requests are respected */
1254         if (!last_request)
1255                 return 0;
1256
1257         switch (pending_request->initiator) {
1258         case REGDOM_SET_BY_CORE:
1259                 return -EINVAL;
1260         case REGDOM_SET_BY_COUNTRY_IE:
1261
1262                 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1263
1264                 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1265                         return -EINVAL;
1266                 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
1267                         if (last_wiphy != wiphy) {
1268                                 /*
1269                                  * Two cards with two APs claiming different
1270                                  * different Country IE alpha2s. We could
1271                                  * intersect them, but that seems unlikely
1272                                  * to be correct. Reject second one for now.
1273                                  */
1274                                 if (regdom_changes(pending_request->alpha2))
1275                                         return -EOPNOTSUPP;
1276                                 return -EALREADY;
1277                         }
1278                         /*
1279                          * Two consecutive Country IE hints on the same wiphy.
1280                          * This should be picked up early by the driver/stack
1281                          */
1282                         if (WARN_ON(regdom_changes(pending_request->alpha2)))
1283                                 return 0;
1284                         return -EALREADY;
1285                 }
1286                 return REG_INTERSECT;
1287         case REGDOM_SET_BY_DRIVER:
1288                 if (last_request->initiator == REGDOM_SET_BY_CORE) {
1289                         if (is_old_static_regdom(cfg80211_regdomain))
1290                                 return 0;
1291                         if (regdom_changes(pending_request->alpha2))
1292                                 return 0;
1293                         return -EALREADY;
1294                 }
1295
1296                 /*
1297                  * This would happen if you unplug and plug your card
1298                  * back in or if you add a new device for which the previously
1299                  * loaded card also agrees on the regulatory domain.
1300                  */
1301                 if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
1302                     !regdom_changes(pending_request->alpha2))
1303                         return -EALREADY;
1304
1305                 return REG_INTERSECT;
1306         case REGDOM_SET_BY_USER:
1307                 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
1308                         return REG_INTERSECT;
1309                 /*
1310                  * If the user knows better the user should set the regdom
1311                  * to their country before the IE is picked up
1312                  */
1313                 if (last_request->initiator == REGDOM_SET_BY_USER &&
1314                           last_request->intersect)
1315                         return -EOPNOTSUPP;
1316                 /*
1317                  * Process user requests only after previous user/driver/core
1318                  * requests have been processed
1319                  */
1320                 if (last_request->initiator == REGDOM_SET_BY_CORE ||
1321                     last_request->initiator == REGDOM_SET_BY_DRIVER ||
1322                     last_request->initiator == REGDOM_SET_BY_USER) {
1323                         if (regdom_changes(last_request->alpha2))
1324                                 return -EAGAIN;
1325                 }
1326
1327                 if (!is_old_static_regdom(cfg80211_regdomain) &&
1328                     !regdom_changes(pending_request->alpha2))
1329                         return -EALREADY;
1330
1331                 return 0;
1332         }
1333
1334         return -EINVAL;
1335 }
1336
1337 /**
1338  * __regulatory_hint - hint to the wireless core a regulatory domain
1339  * @wiphy: if the hint comes from country information from an AP, this
1340  *      is required to be set to the wiphy that received the information
1341  * @pending_request: the regulatory request currently being processed
1342  *
1343  * The Wireless subsystem can use this function to hint to the wireless core
1344  * what it believes should be the current regulatory domain.
1345  *
1346  * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1347  * already been set or other standard error codes.
1348  *
1349  * Caller must hold &cfg80211_mutex
1350  */
1351 static int __regulatory_hint(struct wiphy *wiphy,
1352                              struct regulatory_request *pending_request)
1353 {
1354         bool intersect = false;
1355         int r = 0;
1356
1357         assert_cfg80211_lock();
1358
1359         r = ignore_request(wiphy, pending_request);
1360
1361         if (r == REG_INTERSECT) {
1362                 if (pending_request->initiator == REGDOM_SET_BY_DRIVER) {
1363                         r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1364                         if (r) {
1365                                 kfree(pending_request);
1366                                 return r;
1367                         }
1368                 }
1369                 intersect = true;
1370         } else if (r) {
1371                 /*
1372                  * If the regulatory domain being requested by the
1373                  * driver has already been set just copy it to the
1374                  * wiphy
1375                  */
1376                 if (r == -EALREADY &&
1377                     pending_request->initiator == REGDOM_SET_BY_DRIVER) {
1378                         r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1379                         if (r) {
1380                                 kfree(pending_request);
1381                                 return r;
1382                         }
1383                         r = -EALREADY;
1384                         goto new_request;
1385                 }
1386                 kfree(pending_request);
1387                 return r;
1388         }
1389
1390 new_request:
1391         kfree(last_request);
1392
1393         last_request = pending_request;
1394         last_request->intersect = intersect;
1395
1396         pending_request = NULL;
1397
1398         /* When r == REG_INTERSECT we do need to call CRDA */
1399         if (r < 0)
1400                 return r;
1401
1402         /*
1403          * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
1404          * AND if CRDA is NOT present nothing will happen, if someone
1405          * wants to bother with 11d with OLD_REG you can add a timer.
1406          * If after x amount of time nothing happens you can call:
1407          *
1408          * return set_regdom(country_ie_regdomain);
1409          *
1410          * to intersect with the static rd
1411          */
1412         return call_crda(last_request->alpha2);
1413 }
1414
1415 /* This currently only processes user and driver regulatory hints */
1416 static void reg_process_hint(struct regulatory_request *reg_request)
1417 {
1418         int r = 0;
1419         struct wiphy *wiphy = NULL;
1420
1421         BUG_ON(!reg_request->alpha2);
1422
1423         mutex_lock(&cfg80211_mutex);
1424
1425         if (wiphy_idx_valid(reg_request->wiphy_idx))
1426                 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1427
1428         if (reg_request->initiator == REGDOM_SET_BY_DRIVER &&
1429             !wiphy) {
1430                 kfree(reg_request);
1431                 goto out;
1432         }
1433
1434         r = __regulatory_hint(wiphy, reg_request);
1435         /* This is required so that the orig_* parameters are saved */
1436         if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
1437                 wiphy_update_regulatory(wiphy, reg_request->initiator);
1438 out:
1439         mutex_unlock(&cfg80211_mutex);
1440 }
1441
1442 /* Processes regulatory hints, this is all the REGDOM_SET_BY_* */
1443 static void reg_process_pending_hints(void)
1444         {
1445         struct regulatory_request *reg_request;
1446
1447         spin_lock(&reg_requests_lock);
1448         while (!list_empty(&reg_requests_list)) {
1449                 reg_request = list_first_entry(&reg_requests_list,
1450                                                struct regulatory_request,
1451                                                list);
1452                 list_del_init(&reg_request->list);
1453
1454                 spin_unlock(&reg_requests_lock);
1455                 reg_process_hint(reg_request);
1456                 spin_lock(&reg_requests_lock);
1457         }
1458         spin_unlock(&reg_requests_lock);
1459 }
1460
1461 /* Processes beacon hints -- this has nothing to do with country IEs */
1462 static void reg_process_pending_beacon_hints(void)
1463 {
1464         struct cfg80211_registered_device *drv;
1465         struct reg_beacon *pending_beacon, *tmp;
1466
1467         mutex_lock(&cfg80211_mutex);
1468
1469         /* This goes through the _pending_ beacon list */
1470         spin_lock_bh(&reg_pending_beacons_lock);
1471
1472         if (list_empty(&reg_pending_beacons)) {
1473                 spin_unlock_bh(&reg_pending_beacons_lock);
1474                 goto out;
1475         }
1476
1477         list_for_each_entry_safe(pending_beacon, tmp,
1478                                  &reg_pending_beacons, list) {
1479
1480                 list_del_init(&pending_beacon->list);
1481
1482                 /* Applies the beacon hint to current wiphys */
1483                 list_for_each_entry(drv, &cfg80211_drv_list, list)
1484                         wiphy_update_new_beacon(&drv->wiphy, pending_beacon);
1485
1486                 /* Remembers the beacon hint for new wiphys or reg changes */
1487                 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1488         }
1489
1490         spin_unlock_bh(&reg_pending_beacons_lock);
1491 out:
1492         mutex_unlock(&cfg80211_mutex);
1493 }
1494
1495 static void reg_todo(struct work_struct *work)
1496 {
1497         reg_process_pending_hints();
1498         reg_process_pending_beacon_hints();
1499 }
1500
1501 static DECLARE_WORK(reg_work, reg_todo);
1502
1503 static void queue_regulatory_request(struct regulatory_request *request)
1504 {
1505         spin_lock(&reg_requests_lock);
1506         list_add_tail(&request->list, &reg_requests_list);
1507         spin_unlock(&reg_requests_lock);
1508
1509         schedule_work(&reg_work);
1510 }
1511
1512 /* Core regulatory hint -- happens once during cfg80211_init() */
1513 static int regulatory_hint_core(const char *alpha2)
1514 {
1515         struct regulatory_request *request;
1516
1517         BUG_ON(last_request);
1518
1519         request = kzalloc(sizeof(struct regulatory_request),
1520                           GFP_KERNEL);
1521         if (!request)
1522                 return -ENOMEM;
1523
1524         request->alpha2[0] = alpha2[0];
1525         request->alpha2[1] = alpha2[1];
1526         request->initiator = REGDOM_SET_BY_CORE;
1527
1528         queue_regulatory_request(request);
1529
1530         return 0;
1531 }
1532
1533 /* User hints */
1534 int regulatory_hint_user(const char *alpha2)
1535 {
1536         struct regulatory_request *request;
1537
1538         BUG_ON(!alpha2);
1539
1540         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1541         if (!request)
1542                 return -ENOMEM;
1543
1544         request->wiphy_idx = WIPHY_IDX_STALE;
1545         request->alpha2[0] = alpha2[0];
1546         request->alpha2[1] = alpha2[1];
1547         request->initiator = REGDOM_SET_BY_USER,
1548
1549         queue_regulatory_request(request);
1550
1551         return 0;
1552 }
1553
1554 /* Driver hints */
1555 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1556 {
1557         struct regulatory_request *request;
1558
1559         BUG_ON(!alpha2);
1560         BUG_ON(!wiphy);
1561
1562         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1563         if (!request)
1564                 return -ENOMEM;
1565
1566         request->wiphy_idx = get_wiphy_idx(wiphy);
1567
1568         /* Must have registered wiphy first */
1569         BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1570
1571         request->alpha2[0] = alpha2[0];
1572         request->alpha2[1] = alpha2[1];
1573         request->initiator = REGDOM_SET_BY_DRIVER;
1574
1575         queue_regulatory_request(request);
1576
1577         return 0;
1578 }
1579 EXPORT_SYMBOL(regulatory_hint);
1580
1581 static bool reg_same_country_ie_hint(struct wiphy *wiphy,
1582                         u32 country_ie_checksum)
1583 {
1584         struct wiphy *request_wiphy;
1585
1586         assert_cfg80211_lock();
1587
1588         request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1589
1590         if (!request_wiphy)
1591                 return false;
1592
1593         if (likely(request_wiphy != wiphy))
1594                 return !country_ie_integrity_changes(country_ie_checksum);
1595         /*
1596          * We should not have let these through at this point, they
1597          * should have been picked up earlier by the first alpha2 check
1598          * on the device
1599          */
1600         if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
1601                 return true;
1602         return false;
1603 }
1604
1605 void regulatory_hint_11d(struct wiphy *wiphy,
1606                         u8 *country_ie,
1607                         u8 country_ie_len)
1608 {
1609         struct ieee80211_regdomain *rd = NULL;
1610         char alpha2[2];
1611         u32 checksum = 0;
1612         enum environment_cap env = ENVIRON_ANY;
1613         struct regulatory_request *request;
1614
1615         mutex_lock(&cfg80211_mutex);
1616
1617         if (unlikely(!last_request)) {
1618                 mutex_unlock(&cfg80211_mutex);
1619                 return;
1620         }
1621
1622         /* IE len must be evenly divisible by 2 */
1623         if (country_ie_len & 0x01)
1624                 goto out;
1625
1626         if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1627                 goto out;
1628
1629         /*
1630          * Pending country IE processing, this can happen after we
1631          * call CRDA and wait for a response if a beacon was received before
1632          * we were able to process the last regulatory_hint_11d() call
1633          */
1634         if (country_ie_regdomain)
1635                 goto out;
1636
1637         alpha2[0] = country_ie[0];
1638         alpha2[1] = country_ie[1];
1639
1640         if (country_ie[2] == 'I')
1641                 env = ENVIRON_INDOOR;
1642         else if (country_ie[2] == 'O')
1643                 env = ENVIRON_OUTDOOR;
1644
1645         /*
1646          * We will run this for *every* beacon processed for the BSSID, so
1647          * we optimize an early check to exit out early if we don't have to
1648          * do anything
1649          */
1650         if (likely(wiphy_idx_valid(last_request->wiphy_idx))) {
1651                 struct cfg80211_registered_device *drv_last_ie;
1652
1653                 drv_last_ie =
1654                         cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx);
1655
1656                 /*
1657                  * Lets keep this simple -- we trust the first AP
1658                  * after we intersect with CRDA
1659                  */
1660                 if (likely(&drv_last_ie->wiphy == wiphy)) {
1661                         /*
1662                          * Ignore IEs coming in on this wiphy with
1663                          * the same alpha2 and environment cap
1664                          */
1665                         if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1666                                   alpha2) &&
1667                                   env == drv_last_ie->env)) {
1668                                 goto out;
1669                         }
1670                         /*
1671                          * the wiphy moved on to another BSSID or the AP
1672                          * was reconfigured. XXX: We need to deal with the
1673                          * case where the user suspends and goes to goes
1674                          * to another country, and then gets IEs from an
1675                          * AP with different settings
1676                          */
1677                         goto out;
1678                 } else {
1679                         /*
1680                          * Ignore IEs coming in on two separate wiphys with
1681                          * the same alpha2 and environment cap
1682                          */
1683                         if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1684                                   alpha2) &&
1685                                   env == drv_last_ie->env)) {
1686                                 goto out;
1687                         }
1688                         /* We could potentially intersect though */
1689                         goto out;
1690                 }
1691         }
1692
1693         rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
1694         if (!rd)
1695                 goto out;
1696
1697         /*
1698          * This will not happen right now but we leave it here for the
1699          * the future when we want to add suspend/resume support and having
1700          * the user move to another country after doing so, or having the user
1701          * move to another AP. Right now we just trust the first AP.
1702          *
1703          * If we hit this before we add this support we want to be informed of
1704          * it as it would indicate a mistake in the current design
1705          */
1706         if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))
1707                 goto free_rd_out;
1708
1709         request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1710         if (!request)
1711                 goto free_rd_out;
1712
1713         /*
1714          * We keep this around for when CRDA comes back with a response so
1715          * we can intersect with that
1716          */
1717         country_ie_regdomain = rd;
1718
1719         request->wiphy_idx = get_wiphy_idx(wiphy);
1720         request->alpha2[0] = rd->alpha2[0];
1721         request->alpha2[1] = rd->alpha2[1];
1722         request->initiator = REGDOM_SET_BY_COUNTRY_IE;
1723         request->country_ie_checksum = checksum;
1724         request->country_ie_env = env;
1725
1726         mutex_unlock(&cfg80211_mutex);
1727
1728         queue_regulatory_request(request);
1729
1730         return;
1731
1732 free_rd_out:
1733         kfree(rd);
1734 out:
1735         mutex_unlock(&cfg80211_mutex);
1736 }
1737 EXPORT_SYMBOL(regulatory_hint_11d);
1738
1739 static bool freq_is_chan_12_13_14(u16 freq)
1740 {
1741         if (freq == ieee80211_channel_to_frequency(12) ||
1742             freq == ieee80211_channel_to_frequency(13) ||
1743             freq == ieee80211_channel_to_frequency(14))
1744                 return true;
1745         return false;
1746 }
1747
1748 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1749                                  struct ieee80211_channel *beacon_chan,
1750                                  gfp_t gfp)
1751 {
1752         struct reg_beacon *reg_beacon;
1753
1754         if (likely((beacon_chan->beacon_found ||
1755             (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1756             (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1757              !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1758                 return 0;
1759
1760         reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1761         if (!reg_beacon)
1762                 return -ENOMEM;
1763
1764 #ifdef CONFIG_CFG80211_REG_DEBUG
1765         printk(KERN_DEBUG "cfg80211: Found new beacon on "
1766                 "frequency: %d MHz (Ch %d) on %s\n",
1767                 beacon_chan->center_freq,
1768                 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1769                 wiphy_name(wiphy));
1770 #endif
1771         memcpy(&reg_beacon->chan, beacon_chan,
1772                 sizeof(struct ieee80211_channel));
1773
1774
1775         /*
1776          * Since we can be called from BH or and non-BH context
1777          * we must use spin_lock_bh()
1778          */
1779         spin_lock_bh(&reg_pending_beacons_lock);
1780         list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1781         spin_unlock_bh(&reg_pending_beacons_lock);
1782
1783         schedule_work(&reg_work);
1784
1785         return 0;
1786 }
1787
1788 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1789 {
1790         unsigned int i;
1791         const struct ieee80211_reg_rule *reg_rule = NULL;
1792         const struct ieee80211_freq_range *freq_range = NULL;
1793         const struct ieee80211_power_rule *power_rule = NULL;
1794
1795         printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
1796                 "(max_antenna_gain, max_eirp)\n");
1797
1798         for (i = 0; i < rd->n_reg_rules; i++) {
1799                 reg_rule = &rd->reg_rules[i];
1800                 freq_range = &reg_rule->freq_range;
1801                 power_rule = &reg_rule->power_rule;
1802
1803                 /*
1804                  * There may not be documentation for max antenna gain
1805                  * in certain regions
1806                  */
1807                 if (power_rule->max_antenna_gain)
1808                         printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1809                                 "(%d mBi, %d mBm)\n",
1810                                 freq_range->start_freq_khz,
1811                                 freq_range->end_freq_khz,
1812                                 freq_range->max_bandwidth_khz,
1813                                 power_rule->max_antenna_gain,
1814                                 power_rule->max_eirp);
1815                 else
1816                         printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1817                                 "(N/A, %d mBm)\n",
1818                                 freq_range->start_freq_khz,
1819                                 freq_range->end_freq_khz,
1820                                 freq_range->max_bandwidth_khz,
1821                                 power_rule->max_eirp);
1822         }
1823 }
1824
1825 static void print_regdomain(const struct ieee80211_regdomain *rd)
1826 {
1827
1828         if (is_intersected_alpha2(rd->alpha2)) {
1829
1830                 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
1831                         struct cfg80211_registered_device *drv;
1832                         drv = cfg80211_drv_by_wiphy_idx(
1833                                 last_request->wiphy_idx);
1834                         if (drv) {
1835                                 printk(KERN_INFO "cfg80211: Current regulatory "
1836                                         "domain updated by AP to: %c%c\n",
1837                                         drv->country_ie_alpha2[0],
1838                                         drv->country_ie_alpha2[1]);
1839                         } else
1840                                 printk(KERN_INFO "cfg80211: Current regulatory "
1841                                         "domain intersected: \n");
1842                 } else
1843                                 printk(KERN_INFO "cfg80211: Current regulatory "
1844                                         "domain intersected: \n");
1845         } else if (is_world_regdom(rd->alpha2))
1846                 printk(KERN_INFO "cfg80211: World regulatory "
1847                         "domain updated:\n");
1848         else {
1849                 if (is_unknown_alpha2(rd->alpha2))
1850                         printk(KERN_INFO "cfg80211: Regulatory domain "
1851                                 "changed to driver built-in settings "
1852                                 "(unknown country)\n");
1853                 else
1854                         printk(KERN_INFO "cfg80211: Regulatory domain "
1855                                 "changed to country: %c%c\n",
1856                                 rd->alpha2[0], rd->alpha2[1]);
1857         }
1858         print_rd_rules(rd);
1859 }
1860
1861 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1862 {
1863         printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1864                 rd->alpha2[0], rd->alpha2[1]);
1865         print_rd_rules(rd);
1866 }
1867
1868 #ifdef CONFIG_CFG80211_REG_DEBUG
1869 static void reg_country_ie_process_debug(
1870         const struct ieee80211_regdomain *rd,
1871         const struct ieee80211_regdomain *country_ie_regdomain,
1872         const struct ieee80211_regdomain *intersected_rd)
1873 {
1874         printk(KERN_DEBUG "cfg80211: Received country IE:\n");
1875         print_regdomain_info(country_ie_regdomain);
1876         printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
1877         print_regdomain_info(rd);
1878         if (intersected_rd) {
1879                 printk(KERN_DEBUG "cfg80211: We intersect both of these "
1880                         "and get:\n");
1881                 print_regdomain_info(intersected_rd);
1882                 return;
1883         }
1884         printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
1885 }
1886 #else
1887 static inline void reg_country_ie_process_debug(
1888         const struct ieee80211_regdomain *rd,
1889         const struct ieee80211_regdomain *country_ie_regdomain,
1890         const struct ieee80211_regdomain *intersected_rd)
1891 {
1892 }
1893 #endif
1894
1895 /* Takes ownership of rd only if it doesn't fail */
1896 static int __set_regdom(const struct ieee80211_regdomain *rd)
1897 {
1898         const struct ieee80211_regdomain *intersected_rd = NULL;
1899         struct cfg80211_registered_device *drv = NULL;
1900         struct wiphy *request_wiphy;
1901         /* Some basic sanity checks first */
1902
1903         if (is_world_regdom(rd->alpha2)) {
1904                 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1905                         return -EINVAL;
1906                 update_world_regdomain(rd);
1907                 return 0;
1908         }
1909
1910         if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1911                         !is_unknown_alpha2(rd->alpha2))
1912                 return -EINVAL;
1913
1914         if (!last_request)
1915                 return -EINVAL;
1916
1917         /*
1918          * Lets only bother proceeding on the same alpha2 if the current
1919          * rd is non static (it means CRDA was present and was used last)
1920          * and the pending request came in from a country IE
1921          */
1922         if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1923                 /*
1924                  * If someone else asked us to change the rd lets only bother
1925                  * checking if the alpha2 changes if CRDA was already called
1926                  */
1927                 if (!is_old_static_regdom(cfg80211_regdomain) &&
1928                     !regdom_changes(rd->alpha2))
1929                         return -EINVAL;
1930         }
1931
1932         /*
1933          * Now lets set the regulatory domain, update all driver channels
1934          * and finally inform them of what we have done, in case they want
1935          * to review or adjust their own settings based on their own
1936          * internal EEPROM data
1937          */
1938
1939         if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1940                 return -EINVAL;
1941
1942         if (!is_valid_rd(rd)) {
1943                 printk(KERN_ERR "cfg80211: Invalid "
1944                         "regulatory domain detected:\n");
1945                 print_regdomain_info(rd);
1946                 return -EINVAL;
1947         }
1948
1949         request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1950
1951         if (!last_request->intersect) {
1952                 int r;
1953
1954                 if (last_request->initiator != REGDOM_SET_BY_DRIVER) {
1955                         reset_regdomains();
1956                         cfg80211_regdomain = rd;
1957                         return 0;
1958                 }
1959
1960                 /*
1961                  * For a driver hint, lets copy the regulatory domain the
1962                  * driver wanted to the wiphy to deal with conflicts
1963                  */
1964
1965                 BUG_ON(request_wiphy->regd);
1966
1967                 r = reg_copy_regd(&request_wiphy->regd, rd);
1968                 if (r)
1969                         return r;
1970
1971                 reset_regdomains();
1972                 cfg80211_regdomain = rd;
1973                 return 0;
1974         }
1975
1976         /* Intersection requires a bit more work */
1977
1978         if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1979
1980                 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1981                 if (!intersected_rd)
1982                         return -EINVAL;
1983
1984                 /*
1985                  * We can trash what CRDA provided now.
1986                  * However if a driver requested this specific regulatory
1987                  * domain we keep it for its private use
1988                  */
1989                 if (last_request->initiator == REGDOM_SET_BY_DRIVER)
1990                         request_wiphy->regd = rd;
1991                 else
1992                         kfree(rd);
1993
1994                 rd = NULL;
1995
1996                 reset_regdomains();
1997                 cfg80211_regdomain = intersected_rd;
1998
1999                 return 0;
2000         }
2001
2002         /*
2003          * Country IE requests are handled a bit differently, we intersect
2004          * the country IE rd with what CRDA believes that country should have
2005          */
2006
2007         BUG_ON(!country_ie_regdomain);
2008
2009         if (rd != country_ie_regdomain) {
2010                 /*
2011                  * Intersect what CRDA returned and our what we
2012                  * had built from the Country IE received
2013                  */
2014
2015                 intersected_rd = regdom_intersect(rd, country_ie_regdomain);
2016
2017                 reg_country_ie_process_debug(rd, country_ie_regdomain,
2018                         intersected_rd);
2019
2020                 kfree(country_ie_regdomain);
2021                 country_ie_regdomain = NULL;
2022         } else {
2023                 /*
2024                  * This would happen when CRDA was not present and
2025                  * OLD_REGULATORY was enabled. We intersect our Country
2026                  * IE rd and what was set on cfg80211 originally
2027                  */
2028                 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2029         }
2030
2031         if (!intersected_rd)
2032                 return -EINVAL;
2033
2034         drv = wiphy_to_dev(request_wiphy);
2035
2036         drv->country_ie_alpha2[0] = rd->alpha2[0];
2037         drv->country_ie_alpha2[1] = rd->alpha2[1];
2038         drv->env = last_request->country_ie_env;
2039
2040         BUG_ON(intersected_rd == rd);
2041
2042         kfree(rd);
2043         rd = NULL;
2044
2045         reset_regdomains();
2046         cfg80211_regdomain = intersected_rd;
2047
2048         return 0;
2049 }
2050
2051
2052 /*
2053  * Use this call to set the current regulatory domain. Conflicts with
2054  * multiple drivers can be ironed out later. Caller must've already
2055  * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2056  */
2057 int set_regdom(const struct ieee80211_regdomain *rd)
2058 {
2059         int r;
2060
2061         assert_cfg80211_lock();
2062
2063         /* Note that this doesn't update the wiphys, this is done below */
2064         r = __set_regdom(rd);
2065         if (r) {
2066                 kfree(rd);
2067                 return r;
2068         }
2069
2070         /* This would make this whole thing pointless */
2071         if (!last_request->intersect)
2072                 BUG_ON(rd != cfg80211_regdomain);
2073
2074         /* update all wiphys now with the new established regulatory domain */
2075         update_all_wiphy_regulatory(last_request->initiator);
2076
2077         print_regdomain(cfg80211_regdomain);
2078
2079         return r;
2080 }
2081
2082 /* Caller must hold cfg80211_mutex */
2083 void reg_device_remove(struct wiphy *wiphy)
2084 {
2085         struct wiphy *request_wiphy;
2086
2087         assert_cfg80211_lock();
2088
2089         request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2090
2091         kfree(wiphy->regd);
2092         if (!last_request || !request_wiphy)
2093                 return;
2094         if (request_wiphy != wiphy)
2095                 return;
2096         last_request->wiphy_idx = WIPHY_IDX_STALE;
2097         last_request->country_ie_env = ENVIRON_ANY;
2098 }
2099
2100 int regulatory_init(void)
2101 {
2102         int err = 0;
2103
2104         reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2105         if (IS_ERR(reg_pdev))
2106                 return PTR_ERR(reg_pdev);
2107
2108         spin_lock_init(&reg_requests_lock);
2109         spin_lock_init(&reg_pending_beacons_lock);
2110
2111 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
2112         cfg80211_regdomain = static_regdom(ieee80211_regdom);
2113
2114         printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
2115         print_regdomain_info(cfg80211_regdomain);
2116         /*
2117          * The old code still requests for a new regdomain and if
2118          * you have CRDA you get it updated, otherwise you get
2119          * stuck with the static values. We ignore "EU" code as
2120          * that is not a valid ISO / IEC 3166 alpha2
2121          */
2122         if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
2123                 err = regulatory_hint_core(ieee80211_regdom);
2124 #else
2125         cfg80211_regdomain = cfg80211_world_regdom;
2126
2127         err = regulatory_hint_core("00");
2128 #endif
2129         if (err) {
2130                 if (err == -ENOMEM)
2131                         return err;
2132                 /*
2133                  * N.B. kobject_uevent_env() can fail mainly for when we're out
2134                  * memory which is handled and propagated appropriately above
2135                  * but it can also fail during a netlink_broadcast() or during
2136                  * early boot for call_usermodehelper(). For now treat these
2137                  * errors as non-fatal.
2138                  */
2139                 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
2140                         "to call CRDA during init");
2141 #ifdef CONFIG_CFG80211_REG_DEBUG
2142                 /* We want to find out exactly why when debugging */
2143                 WARN_ON(err);
2144 #endif
2145         }
2146
2147         return 0;
2148 }
2149
2150 void regulatory_exit(void)
2151 {
2152         struct regulatory_request *reg_request, *tmp;
2153         struct reg_beacon *reg_beacon, *btmp;
2154
2155         cancel_work_sync(&reg_work);
2156
2157         mutex_lock(&cfg80211_mutex);
2158
2159         reset_regdomains();
2160
2161         kfree(country_ie_regdomain);
2162         country_ie_regdomain = NULL;
2163
2164         kfree(last_request);
2165
2166         platform_device_unregister(reg_pdev);
2167
2168         spin_lock_bh(&reg_pending_beacons_lock);
2169         if (!list_empty(&reg_pending_beacons)) {
2170                 list_for_each_entry_safe(reg_beacon, btmp,
2171                                          &reg_pending_beacons, list) {
2172                         list_del(&reg_beacon->list);
2173                         kfree(reg_beacon);
2174                 }
2175         }
2176         spin_unlock_bh(&reg_pending_beacons_lock);
2177
2178         if (!list_empty(&reg_beacon_list)) {
2179                 list_for_each_entry_safe(reg_beacon, btmp,
2180                                          &reg_beacon_list, list) {
2181                         list_del(&reg_beacon->list);
2182                         kfree(reg_beacon);
2183                 }
2184         }
2185
2186         spin_lock(&reg_requests_lock);
2187         if (!list_empty(&reg_requests_list)) {
2188                 list_for_each_entry_safe(reg_request, tmp,
2189                                          &reg_requests_list, list) {
2190                         list_del(&reg_request->list);
2191                         kfree(reg_request);
2192                 }
2193         }
2194         spin_unlock(&reg_requests_lock);
2195
2196         mutex_unlock(&cfg80211_mutex);
2197 }