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   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 /**
  46  * struct regulatory_request - receipt of last regulatory request
  47  *
  48  * @wiphy: this is set if this request's initiator is
  49  *      %REGDOM_SET_BY_COUNTRY_IE or %REGDOM_SET_BY_DRIVER. This
  50  *      can be used by the wireless core to deal with conflicts
  51  *      and potentially inform users of which devices specifically
  52  *      cased the conflicts.
  53  * @initiator: indicates who sent this request, could be any of
  54  *      of those set in reg_set_by, %REGDOM_SET_BY_*
  55  * @alpha2: the ISO / IEC 3166 alpha2 country code of the requested
  56  *      regulatory domain. We have a few special codes:
  57  *      00 - World regulatory domain
  58  *      99 - built by driver but a specific alpha2 cannot be determined
  59  *      98 - result of an intersection between two regulatory domains
  60  * @intersect: indicates whether the wireless core should intersect
  61  *      the requested regulatory domain with the presently set regulatory
  62  *      domain.
  63  */
  64 struct regulatory_request {
  65         struct wiphy *wiphy;
  66         enum reg_set_by initiator;
  67         char alpha2[2];
  68         bool intersect;
  69 };
  70
  71 /* Receipt of information from last regulatory request */
  72 static struct regulatory_request *last_request;
  73
  74 /* To trigger userspace events */
  75 static struct platform_device *reg_pdev;
  76
  77 /* Keep the ordering from large to small */
  78 static u32 supported_bandwidths[] = {
  79         MHZ_TO_KHZ(40),
  80         MHZ_TO_KHZ(20),
  81 };
  82
  83 /* Central wireless core regulatory domains, we only need two,
  84  * the current one and a world regulatory domain in case we have no
  85  * information to give us an alpha2 */
  86 static const struct ieee80211_regdomain *cfg80211_regdomain;
  87
  88 /* We keep a static world regulatory domain in case of the absence of CRDA */
  89 static const struct ieee80211_regdomain world_regdom = {
  90         .n_reg_rules = 1,
  91         .alpha2 =  "00",
  92         .reg_rules = {
  93                 REG_RULE(2412-10, 2462+10, 40, 6, 20,
  94                         NL80211_RRF_PASSIVE_SCAN |
  95                         NL80211_RRF_NO_IBSS),
  96         }
  97 };
  98
  99 static const struct ieee80211_regdomain *cfg80211_world_regdom =
 100         &world_regdom;
 101
 102 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
 103 static char *ieee80211_regdom = "US";
 104 module_param(ieee80211_regdom, charp, 0444);
 105 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
 106
 107 /* We assume 40 MHz bandwidth for the old regulatory work.
 108  * We make emphasis we are using the exact same frequencies
 109  * as before */
 110
 111 static const struct ieee80211_regdomain us_regdom = {
 112         .n_reg_rules = 6,
 113         .alpha2 =  "US",
 114         .reg_rules = {
 115                 /* IEEE 802.11b/g, channels 1..11 */
 116                 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
 117                 /* IEEE 802.11a, channel 36 */
 118                 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
 119                 /* IEEE 802.11a, channel 40 */
 120                 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
 121                 /* IEEE 802.11a, channel 44 */
 122                 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
 123                 /* IEEE 802.11a, channels 48..64 */
 124                 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
 125                 /* IEEE 802.11a, channels 149..165, outdoor */
 126                 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
 127         }
 128 };
 129
 130 static const struct ieee80211_regdomain jp_regdom = {
 131         .n_reg_rules = 3,
 132         .alpha2 =  "JP",
 133         .reg_rules = {
 134                 /* IEEE 802.11b/g, channels 1..14 */
 135                 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
 136                 /* IEEE 802.11a, channels 34..48 */
 137                 REG_RULE(5170-10, 5240+10, 40, 6, 20,
 138                         NL80211_RRF_PASSIVE_SCAN),
 139                 /* IEEE 802.11a, channels 52..64 */
 140                 REG_RULE(5260-10, 5320+10, 40, 6, 20,
 141                         NL80211_RRF_NO_IBSS |
 142                         NL80211_RRF_DFS),
 143         }
 144 };
 145
 146 static const struct ieee80211_regdomain eu_regdom = {
 147         .n_reg_rules = 6,
 148         /* This alpha2 is bogus, we leave it here just for stupid
 149          * backward compatibility */
 150         .alpha2 =  "EU",
 151         .reg_rules = {
 152                 /* IEEE 802.11b/g, channels 1..13 */
 153                 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
 154                 /* IEEE 802.11a, channel 36 */
 155                 REG_RULE(5180-10, 5180+10, 40, 6, 23,
 156                         NL80211_RRF_PASSIVE_SCAN),
 157                 /* IEEE 802.11a, channel 40 */
 158                 REG_RULE(5200-10, 5200+10, 40, 6, 23,
 159                         NL80211_RRF_PASSIVE_SCAN),
 160                 /* IEEE 802.11a, channel 44 */
 161                 REG_RULE(5220-10, 5220+10, 40, 6, 23,
 162                         NL80211_RRF_PASSIVE_SCAN),
 163                 /* IEEE 802.11a, channels 48..64 */
 164                 REG_RULE(5240-10, 5320+10, 40, 6, 20,
 165                         NL80211_RRF_NO_IBSS |
 166                         NL80211_RRF_DFS),
 167                 /* IEEE 802.11a, channels 100..140 */
 168                 REG_RULE(5500-10, 5700+10, 40, 6, 30,
 169                         NL80211_RRF_NO_IBSS |
 170                         NL80211_RRF_DFS),
 171         }
 172 };
 173
 174 static const struct ieee80211_regdomain *static_regdom(char *alpha2)
 175 {
 176         if (alpha2[0] == 'U' && alpha2[1] == 'S')
 177                 return &us_regdom;
 178         if (alpha2[0] == 'J' && alpha2[1] == 'P')
 179                 return &jp_regdom;
 180         if (alpha2[0] == 'E' && alpha2[1] == 'U')
 181                 return &eu_regdom;
 182         /* Default, as per the old rules */
 183         return &us_regdom;
 184 }
 185
 186 static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
 187 {
 188         if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
 189                 return true;
 190         return false;
 191 }
 192 #else
 193 static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
 194 {
 195         return false;
 196 }
 197 #endif
 198
 199 static void reset_regdomains(void)
 200 {
 201         /* avoid freeing static information or freeing something twice */
 202         if (cfg80211_regdomain == cfg80211_world_regdom)
 203                 cfg80211_regdomain = NULL;
 204         if (cfg80211_world_regdom == &world_regdom)
 205                 cfg80211_world_regdom = NULL;
 206         if (cfg80211_regdomain == &world_regdom)
 207                 cfg80211_regdomain = NULL;
 208         if (is_old_static_regdom(cfg80211_regdomain))
 209                 cfg80211_regdomain = NULL;
 210
 211         kfree(cfg80211_regdomain);
 212         kfree(cfg80211_world_regdom);
 213
 214         cfg80211_world_regdom = &world_regdom;
 215         cfg80211_regdomain = NULL;
 216 }
 217
 218 /* Dynamic world regulatory domain requested by the wireless
 219  * core upon initialization */
 220 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
 221 {
 222         BUG_ON(!last_request);
 223
 224         reset_regdomains();
 225
 226         cfg80211_world_regdom = rd;
 227         cfg80211_regdomain = rd;
 228 }
 229
 230 bool is_world_regdom(const char *alpha2)
 231 {
 232         if (!alpha2)
 233                 return false;
 234         if (alpha2[0] == '0' && alpha2[1] == '0')
 235                 return true;
 236         return false;
 237 }
 238
 239 static bool is_alpha2_set(const char *alpha2)
 240 {
 241         if (!alpha2)
 242                 return false;
 243         if (alpha2[0] != 0 && alpha2[1] != 0)
 244                 return true;
 245         return false;
 246 }
 247
 248 static bool is_alpha_upper(char letter)
 249 {
 250         /* ASCII A - Z */
 251         if (letter >= 65 && letter <= 90)
 252                 return true;
 253         return false;
 254 }
 255
 256 static bool is_unknown_alpha2(const char *alpha2)
 257 {
 258         if (!alpha2)
 259                 return false;
 260         /* Special case where regulatory domain was built by driver
 261          * but a specific alpha2 cannot be determined */
 262         if (alpha2[0] == '9' && alpha2[1] == '9')
 263                 return true;
 264         return false;
 265 }
 266
 267 static bool is_an_alpha2(const char *alpha2)
 268 {
 269         if (!alpha2)
 270                 return false;
 271         if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
 272                 return true;
 273         return false;
 274 }
 275
 276 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
 277 {
 278         if (!alpha2_x || !alpha2_y)
 279                 return false;
 280         if (alpha2_x[0] == alpha2_y[0] &&
 281                 alpha2_x[1] == alpha2_y[1])
 282                 return true;
 283         return false;
 284 }
 285
 286 static bool regdom_changed(const char *alpha2)
 287 {
 288         if (!cfg80211_regdomain)
 289                 return true;
 290         if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
 291                 return false;
 292         return true;
 293 }
 294
 295 /* This lets us keep regulatory code which is updated on a regulatory
 296  * basis in userspace. */
 297 static int call_crda(const char *alpha2)
 298 {
 299         char country_env[9 + 2] = "COUNTRY=";
 300         char *envp[] = {
 301                 country_env,
 302                 NULL
 303         };
 304
 305         if (!is_world_regdom((char *) alpha2))
 306                 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
 307                         alpha2[0], alpha2[1]);
 308         else
 309                 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
 310                         "regulatory domain\n");
 311
 312         country_env[8] = alpha2[0];
 313         country_env[9] = alpha2[1];
 314
 315         return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
 316 }
 317
 318 /* Used by nl80211 before kmalloc'ing our regulatory domain */
 319 bool reg_is_valid_request(const char *alpha2)
 320 {
 321         if (!last_request)
 322                 return false;
 323
 324         return alpha2_equal(last_request->alpha2, alpha2);
 325 }
 326
 327 /* Sanity check on a regulatory rule */
 328 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
 329 {
 330         const struct ieee80211_freq_range *freq_range = &rule->freq_range;
 331         u32 freq_diff;
 332
 333         if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
 334                 return false;
 335
 336         if (freq_range->start_freq_khz > freq_range->end_freq_khz)
 337                 return false;
 338
 339         freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 340
 341         if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff)
 342                 return false;
 343
 344         return true;
 345 }
 346
 347 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
 348 {
 349         const struct ieee80211_reg_rule *reg_rule = NULL;
 350         unsigned int i;
 351
 352         if (!rd->n_reg_rules)
 353                 return false;
 354
 355         if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
 356                 return false;
 357
 358         for (i = 0; i < rd->n_reg_rules; i++) {
 359                 reg_rule = &rd->reg_rules[i];
 360                 if (!is_valid_reg_rule(reg_rule))
 361                         return false;
 362         }
 363
 364         return true;
 365 }
 366
 367 /* Returns value in KHz */
 368 static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
 369         u32 freq)
 370 {
 371         unsigned int i;
 372         for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
 373                 u32 start_freq_khz = freq - supported_bandwidths[i]/2;
 374                 u32 end_freq_khz = freq + supported_bandwidths[i]/2;
 375                 if (start_freq_khz >= freq_range->start_freq_khz &&
 376                         end_freq_khz <= freq_range->end_freq_khz)
 377                         return supported_bandwidths[i];
 378         }
 379         return 0;
 380 }
 381
 382 /* Helper for regdom_intersect(), this does the real
 383  * mathematical intersection fun */
 384 static int reg_rules_intersect(
 385         const struct ieee80211_reg_rule *rule1,
 386         const struct ieee80211_reg_rule *rule2,
 387         struct ieee80211_reg_rule *intersected_rule)
 388 {
 389         const struct ieee80211_freq_range *freq_range1, *freq_range2;
 390         struct ieee80211_freq_range *freq_range;
 391         const struct ieee80211_power_rule *power_rule1, *power_rule2;
 392         struct ieee80211_power_rule *power_rule;
 393         u32 freq_diff;
 394
 395         freq_range1 = &rule1->freq_range;
 396         freq_range2 = &rule2->freq_range;
 397         freq_range = &intersected_rule->freq_range;
 398
 399         power_rule1 = &rule1->power_rule;
 400         power_rule2 = &rule2->power_rule;
 401         power_rule = &intersected_rule->power_rule;
 402
 403         freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
 404                 freq_range2->start_freq_khz);
 405         freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
 406                 freq_range2->end_freq_khz);
 407         freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
 408                 freq_range2->max_bandwidth_khz);
 409
 410         freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 411         if (freq_range->max_bandwidth_khz > freq_diff)
 412                 freq_range->max_bandwidth_khz = freq_diff;
 413
 414         power_rule->max_eirp = min(power_rule1->max_eirp,
 415                 power_rule2->max_eirp);
 416         power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
 417                 power_rule2->max_antenna_gain);
 418
 419         intersected_rule->flags = (rule1->flags | rule2->flags);
 420
 421         if (!is_valid_reg_rule(intersected_rule))
 422                 return -EINVAL;
 423
 424         return 0;
 425 }
 426
 427 /**
 428  * regdom_intersect - do the intersection between two regulatory domains
 429  * @rd1: first regulatory domain
 430  * @rd2: second regulatory domain
 431  *
 432  * Use this function to get the intersection between two regulatory domains.
 433  * Once completed we will mark the alpha2 for the rd as intersected, "98",
 434  * as no one single alpha2 can represent this regulatory domain.
 435  *
 436  * Returns a pointer to the regulatory domain structure which will hold the
 437  * resulting intersection of rules between rd1 and rd2. We will
 438  * kzalloc() this structure for you.
 439  */
 440 static struct ieee80211_regdomain *regdom_intersect(
 441         const struct ieee80211_regdomain *rd1,
 442         const struct ieee80211_regdomain *rd2)
 443 {
 444         int r, size_of_regd;
 445         unsigned int x, y;
 446         unsigned int num_rules = 0, rule_idx = 0;
 447         const struct ieee80211_reg_rule *rule1, *rule2;
 448         struct ieee80211_reg_rule *intersected_rule;
 449         struct ieee80211_regdomain *rd;
 450         /* This is just a dummy holder to help us count */
 451         struct ieee80211_reg_rule irule;
 452
 453         /* Uses the stack temporarily for counter arithmetic */
 454         intersected_rule = &irule;
 455
 456         memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
 457
 458         if (!rd1 || !rd2)
 459                 return NULL;
 460
 461         /* First we get a count of the rules we'll need, then we actually
 462          * build them. This is to so we can malloc() and free() a
 463          * regdomain once. The reason we use reg_rules_intersect() here
 464          * is it will return -EINVAL if the rule computed makes no sense.
 465          * All rules that do check out OK are valid. */
 466
 467         for (x = 0; x < rd1->n_reg_rules; x++) {
 468                 rule1 = &rd1->reg_rules[x];
 469                 for (y = 0; y < rd2->n_reg_rules; y++) {
 470                         rule2 = &rd2->reg_rules[y];
 471                         if (!reg_rules_intersect(rule1, rule2,
 472                                         intersected_rule))
 473                                 num_rules++;
 474                         memset(intersected_rule, 0,
 475                                         sizeof(struct ieee80211_reg_rule));
 476                 }
 477         }
 478
 479         if (!num_rules)
 480                 return NULL;
 481
 482         size_of_regd = sizeof(struct ieee80211_regdomain) +
 483                 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
 484
 485         rd = kzalloc(size_of_regd, GFP_KERNEL);
 486         if (!rd)
 487                 return NULL;
 488
 489         for (x = 0; x < rd1->n_reg_rules; x++) {
 490                 rule1 = &rd1->reg_rules[x];
 491                 for (y = 0; y < rd2->n_reg_rules; y++) {
 492                         rule2 = &rd2->reg_rules[y];
 493                         /* This time around instead of using the stack lets
 494                          * write to the target rule directly saving ourselves
 495                          * a memcpy() */
 496                         intersected_rule = &rd->reg_rules[rule_idx];
 497                         r = reg_rules_intersect(rule1, rule2,
 498                                 intersected_rule);
 499                         /* No need to memset here the intersected rule here as
 500                          * we're not using the stack anymore */
 501                         if (r)
 502                                 continue;
 503                         rule_idx++;
 504                 }
 505         }
 506
 507         if (rule_idx != num_rules) {
 508                 kfree(rd);
 509                 return NULL;
 510         }
 511
 512         rd->n_reg_rules = num_rules;
 513         rd->alpha2[0] = '9';
 514         rd->alpha2[1] = '8';
 515
 516         return rd;
 517 }
 518
 519 /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
 520  * want to just have the channel structure use these */
 521 static u32 map_regdom_flags(u32 rd_flags)
 522 {
 523         u32 channel_flags = 0;
 524         if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
 525                 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 526         if (rd_flags & NL80211_RRF_NO_IBSS)
 527                 channel_flags |= IEEE80211_CHAN_NO_IBSS;
 528         if (rd_flags & NL80211_RRF_DFS)
 529                 channel_flags |= IEEE80211_CHAN_RADAR;
 530         return channel_flags;
 531 }
 532
 533 /**
 534  * freq_reg_info - get regulatory information for the given frequency
 535  * @center_freq: Frequency in KHz for which we want regulatory information for
 536  * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one
 537  *      you can set this to 0. If this frequency is allowed we then set
 538  *      this value to the maximum allowed bandwidth.
 539  * @reg_rule: the regulatory rule which we have for this frequency
 540  *
 541  * Use this function to get the regulatory rule for a specific frequency.
 542  */
 543 static int freq_reg_info(u32 center_freq, u32 *bandwidth,
 544                          const struct ieee80211_reg_rule **reg_rule)
 545 {
 546         int i;
 547         u32 max_bandwidth = 0;
 548
 549         if (!cfg80211_regdomain)
 550                 return -EINVAL;
 551
 552         for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) {
 553                 const struct ieee80211_reg_rule *rr;
 554                 const struct ieee80211_freq_range *fr = NULL;
 555                 const struct ieee80211_power_rule *pr = NULL;
 556
 557                 rr = &cfg80211_regdomain->reg_rules[i];
 558                 fr = &rr->freq_range;
 559                 pr = &rr->power_rule;
 560                 max_bandwidth = freq_max_bandwidth(fr, center_freq);
 561                 if (max_bandwidth && *bandwidth <= max_bandwidth) {
 562                         *reg_rule = rr;
 563                         *bandwidth = max_bandwidth;
 564                         break;
 565                 }
 566         }
 567
 568         return !max_bandwidth;
 569 }
 570
 571 static void handle_channel(struct ieee80211_channel *chan)
 572 {
 573         int r;
 574         u32 flags = chan->orig_flags;
 575         u32 max_bandwidth = 0;
 576         const struct ieee80211_reg_rule *reg_rule = NULL;
 577         const struct ieee80211_power_rule *power_rule = NULL;
 578
 579         r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq),
 580                 &max_bandwidth, &reg_rule);
 581
 582         if (r) {
 583                 flags |= IEEE80211_CHAN_DISABLED;
 584                 chan->flags = flags;
 585                 return;
 586         }
 587
 588         power_rule = &reg_rule->power_rule;
 589
 590         chan->flags = flags | map_regdom_flags(reg_rule->flags);
 591         chan->max_antenna_gain = min(chan->orig_mag,
 592                 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
 593         chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
 594         if (chan->orig_mpwr)
 595                 chan->max_power = min(chan->orig_mpwr,
 596                         (int) MBM_TO_DBM(power_rule->max_eirp));
 597         else
 598                 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
 599 }
 600
 601 static void handle_band(struct ieee80211_supported_band *sband)
 602 {
 603         int i;
 604
 605         for (i = 0; i < sband->n_channels; i++)
 606                 handle_channel(&sband->channels[i]);
 607 }
 608
 609 static void update_all_wiphy_regulatory(enum reg_set_by setby)
 610 {
 611         struct cfg80211_registered_device *drv;
 612
 613         list_for_each_entry(drv, &cfg80211_drv_list, list)
 614                 wiphy_update_regulatory(&drv->wiphy, setby);
 615 }
 616
 617 void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
 618 {
 619         enum ieee80211_band band;
 620         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 621                 if (wiphy->bands[band])
 622                         handle_band(wiphy->bands[band]);
 623                 if (wiphy->reg_notifier)
 624                         wiphy->reg_notifier(wiphy, setby);
 625         }
 626 }
 627
 628 /* Return value which can be used by ignore_request() to indicate
 629  * it has been determined we should intersect two regulatory domains */
 630 #define REG_INTERSECT   1
 631
 632 /* This has the logic which determines when a new request
 633  * should be ignored. */
 634 static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
 635                           const char *alpha2)
 636 {
 637         /* All initial requests are respected */
 638         if (!last_request)
 639                 return 0;
 640
 641         switch (set_by) {
 642         case REGDOM_SET_BY_INIT:
 643                 return -EINVAL;
 644         case REGDOM_SET_BY_CORE:
 645                 /*
 646                  * Always respect new wireless core hints, should only happen
 647                  * when updating the world regulatory domain at init.
 648                  */
 649                 return 0;
 650         case REGDOM_SET_BY_COUNTRY_IE:
 651                 if (unlikely(!is_an_alpha2(alpha2)))
 652                         return -EINVAL;
 653                 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
 654                         if (last_request->wiphy != wiphy) {
 655                                 /*
 656                                  * Two cards with two APs claiming different
 657                                  * different Country IE alpha2s. We could
 658                                  * intersect them, but that seems unlikely
 659                                  * to be correct. Reject second one for now.
 660                                  */
 661                                 if (!alpha2_equal(alpha2,
 662                                                   cfg80211_regdomain->alpha2))
 663                                         return -EOPNOTSUPP;
 664                                 return -EALREADY;
 665                         }
 666                         /* Two consecutive Country IE hints on the same wiphy */
 667                         if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
 668                                 return 0;
 669                         return -EALREADY;
 670                 }
 671                 /*
 672                  * Ignore Country IE hints for now, need to think about
 673                  * what we need to do to support multi-domain operation.
 674                  */
 675                 return -EOPNOTSUPP;
 676         case REGDOM_SET_BY_DRIVER:
 677                 if (last_request->initiator == REGDOM_SET_BY_DRIVER)
 678                         return -EALREADY;
 679                 return 0;
 680         case REGDOM_SET_BY_USER:
 681                 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
 682                         return REG_INTERSECT;
 683                 return 0;
 684         }
 685
 686         return -EINVAL;
 687 }
 688
 689 /* Caller must hold &cfg80211_drv_mutex */
 690 int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
 691                       const char *alpha2)
 692 {
 693         struct regulatory_request *request;
 694         bool intersect = false;
 695         int r = 0;
 696
 697         r = ignore_request(wiphy, set_by, alpha2);
 698
 699         if (r == REG_INTERSECT)
 700                 intersect = true;
 701         else if (r)
 702                 return r;
 703
 704         request = kzalloc(sizeof(struct regulatory_request),
 705                           GFP_KERNEL);
 706         if (!request)
 707                 return -ENOMEM;
 708
 709         request->alpha2[0] = alpha2[0];
 710         request->alpha2[1] = alpha2[1];
 711         request->initiator = set_by;
 712         request->wiphy = wiphy;
 713         request->intersect = intersect;
 714
 715         kfree(last_request);
 716         last_request = request;
 717         return call_crda(alpha2);
 718 }
 719
 720 void regulatory_hint(struct wiphy *wiphy, const char *alpha2)
 721 {
 722         BUG_ON(!alpha2);
 723
 724         mutex_lock(&cfg80211_drv_mutex);
 725         __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2);
 726         mutex_unlock(&cfg80211_drv_mutex);
 727 }
 728 EXPORT_SYMBOL(regulatory_hint);
 729
 730
 731 static void print_rd_rules(const struct ieee80211_regdomain *rd)
 732 {
 733         unsigned int i;
 734         const struct ieee80211_reg_rule *reg_rule = NULL;
 735         const struct ieee80211_freq_range *freq_range = NULL;
 736         const struct ieee80211_power_rule *power_rule = NULL;
 737
 738         printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
 739                 "(max_antenna_gain, max_eirp)\n");
 740
 741         for (i = 0; i < rd->n_reg_rules; i++) {
 742                 reg_rule = &rd->reg_rules[i];
 743                 freq_range = &reg_rule->freq_range;
 744                 power_rule = &reg_rule->power_rule;
 745
 746                 /* There may not be documentation for max antenna gain
 747                  * in certain regions */
 748                 if (power_rule->max_antenna_gain)
 749                         printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
 750                                 "(%d mBi, %d mBm)\n",
 751                                 freq_range->start_freq_khz,
 752                                 freq_range->end_freq_khz,
 753                                 freq_range->max_bandwidth_khz,
 754                                 power_rule->max_antenna_gain,
 755                                 power_rule->max_eirp);
 756                 else
 757                         printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
 758                                 "(N/A, %d mBm)\n",
 759                                 freq_range->start_freq_khz,
 760                                 freq_range->end_freq_khz,
 761                                 freq_range->max_bandwidth_khz,
 762                                 power_rule->max_eirp);
 763         }
 764 }
 765
 766 static void print_regdomain(const struct ieee80211_regdomain *rd)
 767 {
 768
 769         if (is_world_regdom(rd->alpha2))
 770                 printk(KERN_INFO "cfg80211: World regulatory "
 771                         "domain updated:\n");
 772         else {
 773                 if (is_unknown_alpha2(rd->alpha2))
 774                         printk(KERN_INFO "cfg80211: Regulatory domain "
 775                                 "changed to driver built-in settings "
 776                                 "(unknown country)\n");
 777                 else
 778                         printk(KERN_INFO "cfg80211: Regulatory domain "
 779                                 "changed to country: %c%c\n",
 780                                 rd->alpha2[0], rd->alpha2[1]);
 781         }
 782         print_rd_rules(rd);
 783 }
 784
 785 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
 786 {
 787         printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
 788                 rd->alpha2[0], rd->alpha2[1]);
 789         print_rd_rules(rd);
 790 }
 791
 792 /* Takes ownership of rd only if it doesn't fail */
 793 static int __set_regdom(const struct ieee80211_regdomain *rd)
 794 {
 795         const struct ieee80211_regdomain *intersected_rd = NULL;
 796         /* Some basic sanity checks first */
 797
 798         if (is_world_regdom(rd->alpha2)) {
 799                 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
 800                         return -EINVAL;
 801                 update_world_regdomain(rd);
 802                 return 0;
 803         }
 804
 805         if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
 806                         !is_unknown_alpha2(rd->alpha2))
 807                 return -EINVAL;
 808
 809         if (!last_request)
 810                 return -EINVAL;
 811
 812         /* allow overriding the static definitions if CRDA is present */
 813         if (!is_old_static_regdom(cfg80211_regdomain) &&
 814             !regdom_changed(rd->alpha2))
 815                 return -EINVAL;
 816
 817         /* Now lets set the regulatory domain, update all driver channels
 818          * and finally inform them of what we have done, in case they want
 819          * to review or adjust their own settings based on their own
 820          * internal EEPROM data */
 821
 822         if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
 823                 return -EINVAL;
 824
 825         if (!is_valid_rd(rd)) {
 826                 printk(KERN_ERR "cfg80211: Invalid "
 827                         "regulatory domain detected:\n");
 828                 print_regdomain_info(rd);
 829                 return -EINVAL;
 830         }
 831
 832         if (!last_request->intersect) {
 833                 reset_regdomains();
 834                 cfg80211_regdomain = rd;
 835                 return 0;
 836         }
 837
 838         /* Intersection requires a bit more work */
 839
 840         if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
 841
 842                 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
 843                 if (!intersected_rd)
 844                         return -EINVAL;
 845
 846                 /* We can trash what CRDA provided now */
 847                 kfree(rd);
 848                 rd = NULL;
 849
 850                 reset_regdomains();
 851                 cfg80211_regdomain = intersected_rd;
 852
 853                 return 0;
 854         }
 855
 856         /* Country IE parsing coming soon */
 857         reset_regdomains();
 858         WARN_ON(1);
 859
 860         return 0;
 861 }
 862
 863
 864 /* Use this call to set the current regulatory domain. Conflicts with
 865  * multiple drivers can be ironed out later. Caller must've already
 866  * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */
 867 int set_regdom(const struct ieee80211_regdomain *rd)
 868 {
 869         int r;
 870
 871         /* Note that this doesn't update the wiphys, this is done below */
 872         r = __set_regdom(rd);
 873         if (r) {
 874                 kfree(rd);
 875                 return r;
 876         }
 877
 878         /* This would make this whole thing pointless */
 879         if (!last_request->intersect)
 880                 BUG_ON(rd != cfg80211_regdomain);
 881
 882         /* update all wiphys now with the new established regulatory domain */
 883         update_all_wiphy_regulatory(last_request->initiator);
 884
 885         print_regdomain(cfg80211_regdomain);
 886
 887         return r;
 888 }
 889
 890 int regulatory_init(void)
 891 {
 892         int err;
 893
 894         reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
 895         if (IS_ERR(reg_pdev))
 896                 return PTR_ERR(reg_pdev);
 897
 898 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
 899         cfg80211_regdomain = static_regdom(ieee80211_regdom);
 900
 901         printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
 902         print_regdomain_info(cfg80211_regdomain);
 903         /* The old code still requests for a new regdomain and if
 904          * you have CRDA you get it updated, otherwise you get
 905          * stuck with the static values. We ignore "EU" code as
 906          * that is not a valid ISO / IEC 3166 alpha2 */
 907         if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
 908                 err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE,
 909                                         ieee80211_regdom);
 910 #else
 911         cfg80211_regdomain = cfg80211_world_regdom;
 912
 913         err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00");
 914         if (err)
 915                 printk(KERN_ERR "cfg80211: calling CRDA failed - "
 916                        "unable to update world regulatory domain, "
 917                        "using static definition\n");
 918 #endif
 919
 920         return 0;
 921 }
 922
 923 void regulatory_exit(void)
 924 {
 925         mutex_lock(&cfg80211_drv_mutex);
 926
 927         reset_regdomains();
 928
 929         kfree(last_request);
 930
 931         platform_device_unregister(reg_pdev);
 932
 933         mutex_unlock(&cfg80211_drv_mutex);
 934 }