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