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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         for (i = 0; i < rd->n_reg_rules; i++) {
 356                 reg_rule = &rd->reg_rules[i];
 357                 if (!is_valid_reg_rule(reg_rule))
 358                         return false;
 359         }
 360
 361         return true;
 362 }
 363
 364 /* Returns value in KHz */
 365 static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
 366         u32 freq)
 367 {
 368         unsigned int i;
 369         for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
 370                 u32 start_freq_khz = freq - supported_bandwidths[i]/2;
 371                 u32 end_freq_khz = freq + supported_bandwidths[i]/2;
 372                 if (start_freq_khz >= freq_range->start_freq_khz &&
 373                         end_freq_khz <= freq_range->end_freq_khz)
 374                         return supported_bandwidths[i];
 375         }
 376         return 0;
 377 }
 378
 379 /* Helper for regdom_intersect(), this does the real
 380  * mathematical intersection fun */
 381 static int reg_rules_intersect(
 382         const struct ieee80211_reg_rule *rule1,
 383         const struct ieee80211_reg_rule *rule2,
 384         struct ieee80211_reg_rule *intersected_rule)
 385 {
 386         const struct ieee80211_freq_range *freq_range1, *freq_range2;
 387         struct ieee80211_freq_range *freq_range;
 388         const struct ieee80211_power_rule *power_rule1, *power_rule2;
 389         struct ieee80211_power_rule *power_rule;
 390         u32 freq_diff;
 391
 392         freq_range1 = &rule1->freq_range;
 393         freq_range2 = &rule2->freq_range;
 394         freq_range = &intersected_rule->freq_range;
 395
 396         power_rule1 = &rule1->power_rule;
 397         power_rule2 = &rule2->power_rule;
 398         power_rule = &intersected_rule->power_rule;
 399
 400         freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
 401                 freq_range2->start_freq_khz);
 402         freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
 403                 freq_range2->end_freq_khz);
 404         freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
 405                 freq_range2->max_bandwidth_khz);
 406
 407         freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 408         if (freq_range->max_bandwidth_khz > freq_diff)
 409                 freq_range->max_bandwidth_khz = freq_diff;
 410
 411         power_rule->max_eirp = min(power_rule1->max_eirp,
 412                 power_rule2->max_eirp);
 413         power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
 414                 power_rule2->max_antenna_gain);
 415
 416         intersected_rule->flags = (rule1->flags | rule2->flags);
 417
 418         if (!is_valid_reg_rule(intersected_rule))
 419                 return -EINVAL;
 420
 421         return 0;
 422 }
 423
 424 /**
 425  * regdom_intersect - do the intersection between two regulatory domains
 426  * @rd1: first regulatory domain
 427  * @rd2: second regulatory domain
 428  *
 429  * Use this function to get the intersection between two regulatory domains.
 430  * Once completed we will mark the alpha2 for the rd as intersected, "98",
 431  * as no one single alpha2 can represent this regulatory domain.
 432  *
 433  * Returns a pointer to the regulatory domain structure which will hold the
 434  * resulting intersection of rules between rd1 and rd2. We will
 435  * kzalloc() this structure for you.
 436  */
 437 static struct ieee80211_regdomain *regdom_intersect(
 438         const struct ieee80211_regdomain *rd1,
 439         const struct ieee80211_regdomain *rd2)
 440 {
 441         int r, size_of_regd;
 442         unsigned int x, y;
 443         unsigned int num_rules = 0, rule_idx = 0;
 444         const struct ieee80211_reg_rule *rule1, *rule2;
 445         struct ieee80211_reg_rule *intersected_rule;
 446         struct ieee80211_regdomain *rd;
 447         /* This is just a dummy holder to help us count */
 448         struct ieee80211_reg_rule irule;
 449
 450         /* Uses the stack temporarily for counter arithmetic */
 451         intersected_rule = &irule;
 452
 453         memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
 454
 455         if (!rd1 || !rd2)
 456                 return NULL;
 457
 458         /* First we get a count of the rules we'll need, then we actually
 459          * build them. This is to so we can malloc() and free() a
 460          * regdomain once. The reason we use reg_rules_intersect() here
 461          * is it will return -EINVAL if the rule computed makes no sense.
 462          * All rules that do check out OK are valid. */
 463
 464         for (x = 0; x < rd1->n_reg_rules; x++) {
 465                 rule1 = &rd1->reg_rules[x];
 466                 for (y = 0; y < rd2->n_reg_rules; y++) {
 467                         rule2 = &rd2->reg_rules[y];
 468                         if (!reg_rules_intersect(rule1, rule2,
 469                                         intersected_rule))
 470                                 num_rules++;
 471                         memset(intersected_rule, 0,
 472                                         sizeof(struct ieee80211_reg_rule));
 473                 }
 474         }
 475
 476         if (!num_rules)
 477                 return NULL;
 478
 479         size_of_regd = sizeof(struct ieee80211_regdomain) +
 480                 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
 481
 482         rd = kzalloc(size_of_regd, GFP_KERNEL);
 483         if (!rd)
 484                 return NULL;
 485
 486         for (x = 0; x < rd1->n_reg_rules; x++) {
 487                 rule1 = &rd1->reg_rules[x];
 488                 for (y = 0; y < rd2->n_reg_rules; y++) {
 489                         rule2 = &rd2->reg_rules[y];
 490                         /* This time around instead of using the stack lets
 491                          * write to the target rule directly saving ourselves
 492                          * a memcpy() */
 493                         intersected_rule = &rd->reg_rules[rule_idx];
 494                         r = reg_rules_intersect(rule1, rule2,
 495                                 intersected_rule);
 496                         /* No need to memset here the intersected rule here as
 497                          * we're not using the stack anymore */
 498                         if (r)
 499                                 continue;
 500                         rule_idx++;
 501                 }
 502         }
 503
 504         if (rule_idx != num_rules) {
 505                 kfree(rd);
 506                 return NULL;
 507         }
 508
 509         rd->n_reg_rules = num_rules;
 510         rd->alpha2[0] = '9';
 511         rd->alpha2[1] = '8';
 512
 513         return rd;
 514 }
 515
 516 /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
 517  * want to just have the channel structure use these */
 518 static u32 map_regdom_flags(u32 rd_flags)
 519 {
 520         u32 channel_flags = 0;
 521         if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
 522                 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 523         if (rd_flags & NL80211_RRF_NO_IBSS)
 524                 channel_flags |= IEEE80211_CHAN_NO_IBSS;
 525         if (rd_flags & NL80211_RRF_DFS)
 526                 channel_flags |= IEEE80211_CHAN_RADAR;
 527         return channel_flags;
 528 }
 529
 530 /**
 531  * freq_reg_info - get regulatory information for the given frequency
 532  * @center_freq: Frequency in KHz for which we want regulatory information for
 533  * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one
 534  *      you can set this to 0. If this frequency is allowed we then set
 535  *      this value to the maximum allowed bandwidth.
 536  * @reg_rule: the regulatory rule which we have for this frequency
 537  *
 538  * Use this function to get the regulatory rule for a specific frequency.
 539  */
 540 static int freq_reg_info(u32 center_freq, u32 *bandwidth,
 541                          const struct ieee80211_reg_rule **reg_rule)
 542 {
 543         int i;
 544         u32 max_bandwidth = 0;
 545
 546         if (!cfg80211_regdomain)
 547                 return -EINVAL;
 548
 549         for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) {
 550                 const struct ieee80211_reg_rule *rr;
 551                 const struct ieee80211_freq_range *fr = NULL;
 552                 const struct ieee80211_power_rule *pr = NULL;
 553
 554                 rr = &cfg80211_regdomain->reg_rules[i];
 555                 fr = &rr->freq_range;
 556                 pr = &rr->power_rule;
 557                 max_bandwidth = freq_max_bandwidth(fr, center_freq);
 558                 if (max_bandwidth && *bandwidth <= max_bandwidth) {
 559                         *reg_rule = rr;
 560                         *bandwidth = max_bandwidth;
 561                         break;
 562                 }
 563         }
 564
 565         return !max_bandwidth;
 566 }
 567
 568 static void handle_channel(struct ieee80211_channel *chan)
 569 {
 570         int r;
 571         u32 flags = chan->orig_flags;
 572         u32 max_bandwidth = 0;
 573         const struct ieee80211_reg_rule *reg_rule = NULL;
 574         const struct ieee80211_power_rule *power_rule = NULL;
 575
 576         r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq),
 577                 &max_bandwidth, &reg_rule);
 578
 579         if (r) {
 580                 flags |= IEEE80211_CHAN_DISABLED;
 581                 chan->flags = flags;
 582                 return;
 583         }
 584
 585         power_rule = &reg_rule->power_rule;
 586
 587         chan->flags = flags | map_regdom_flags(reg_rule->flags);
 588         chan->max_antenna_gain = min(chan->orig_mag,
 589                 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
 590         chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
 591         if (chan->orig_mpwr)
 592                 chan->max_power = min(chan->orig_mpwr,
 593                         (int) MBM_TO_DBM(power_rule->max_eirp));
 594         else
 595                 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
 596 }
 597
 598 static void handle_band(struct ieee80211_supported_band *sband)
 599 {
 600         int i;
 601
 602         for (i = 0; i < sband->n_channels; i++)
 603                 handle_channel(&sband->channels[i]);
 604 }
 605
 606 static void update_all_wiphy_regulatory(enum reg_set_by setby)
 607 {
 608         struct cfg80211_registered_device *drv;
 609
 610         list_for_each_entry(drv, &cfg80211_drv_list, list)
 611                 wiphy_update_regulatory(&drv->wiphy, setby);
 612 }
 613
 614 void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
 615 {
 616         enum ieee80211_band band;
 617         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 618                 if (wiphy->bands[band])
 619                         handle_band(wiphy->bands[band]);
 620                 if (wiphy->reg_notifier)
 621                         wiphy->reg_notifier(wiphy, setby);
 622         }
 623 }
 624
 625 /* Return value which can be used by ignore_request() to indicate
 626  * it has been determined we should intersect two regulatory domains */
 627 #define REG_INTERSECT   1
 628
 629 /* This has the logic which determines when a new request
 630  * should be ignored. */
 631 static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
 632                           const char *alpha2)
 633 {
 634         /* All initial requests are respected */
 635         if (!last_request)
 636                 return 0;
 637
 638         switch (set_by) {
 639         case REGDOM_SET_BY_INIT:
 640                 return -EINVAL;
 641         case REGDOM_SET_BY_CORE:
 642                 /*
 643                  * Always respect new wireless core hints, should only happen
 644                  * when updating the world regulatory domain at init.
 645                  */
 646                 return 0;
 647         case REGDOM_SET_BY_COUNTRY_IE:
 648                 if (unlikely(!is_an_alpha2(alpha2)))
 649                         return -EINVAL;
 650                 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
 651                         if (last_request->wiphy != wiphy) {
 652                                 /*
 653                                  * Two cards with two APs claiming different
 654                                  * different Country IE alpha2s. We could
 655                                  * intersect them, but that seems unlikely
 656                                  * to be correct. Reject second one for now.
 657                                  */
 658                                 if (!alpha2_equal(alpha2,
 659                                                   cfg80211_regdomain->alpha2))
 660                                         return -EOPNOTSUPP;
 661                                 return -EALREADY;
 662                         }
 663                         /* Two consecutive Country IE hints on the same wiphy */
 664                         if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
 665                                 return 0;
 666                         return -EALREADY;
 667                 }
 668                 /*
 669                  * Ignore Country IE hints for now, need to think about
 670                  * what we need to do to support multi-domain operation.
 671                  */
 672                 return -EOPNOTSUPP;
 673         case REGDOM_SET_BY_DRIVER:
 674                 if (last_request->initiator == REGDOM_SET_BY_DRIVER)
 675                         return -EALREADY;
 676                 return 0;
 677         case REGDOM_SET_BY_USER:
 678                 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
 679                         return REG_INTERSECT;
 680                 return 0;
 681         }
 682
 683         return -EINVAL;
 684 }
 685
 686 /* Caller must hold &cfg80211_drv_mutex */
 687 int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
 688                       const char *alpha2)
 689 {
 690         struct regulatory_request *request;
 691         bool intersect = false;
 692         int r = 0;
 693
 694         r = ignore_request(wiphy, set_by, alpha2);
 695
 696         if (r == REG_INTERSECT)
 697                 intersect = true;
 698         else if (r)
 699                 return r;
 700
 701         request = kzalloc(sizeof(struct regulatory_request),
 702                           GFP_KERNEL);
 703         if (!request)
 704                 return -ENOMEM;
 705
 706         request->alpha2[0] = alpha2[0];
 707         request->alpha2[1] = alpha2[1];
 708         request->initiator = set_by;
 709         request->wiphy = wiphy;
 710         request->intersect = intersect;
 711
 712         kfree(last_request);
 713         last_request = request;
 714         return call_crda(alpha2);
 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         if (!is_valid_rd(rd)) {
 823                 printk(KERN_ERR "cfg80211: Invalid "
 824                         "regulatory domain detected:\n");
 825                 print_regdomain_info(rd);
 826                 return -EINVAL;
 827         }
 828
 829         if (!last_request->intersect) {
 830                 reset_regdomains();
 831                 cfg80211_regdomain = rd;
 832                 return 0;
 833         }
 834
 835         /* Intersection requires a bit more work */
 836
 837         if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
 838
 839                 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
 840                 if (!intersected_rd)
 841                         return -EINVAL;
 842
 843                 /* We can trash what CRDA provided now */
 844                 kfree(rd);
 845                 rd = NULL;
 846
 847                 reset_regdomains();
 848                 cfg80211_regdomain = intersected_rd;
 849
 850                 return 0;
 851         }
 852
 853         /* Country IE parsing coming soon */
 854         reset_regdomains();
 855         WARN_ON(1);
 856
 857         return 0;
 858 }
 859
 860
 861 /* Use this call to set the current regulatory domain. Conflicts with
 862  * multiple drivers can be ironed out later. Caller must've already
 863  * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */
 864 int set_regdom(const struct ieee80211_regdomain *rd)
 865 {
 866         int r;
 867
 868         /* Note that this doesn't update the wiphys, this is done below */
 869         r = __set_regdom(rd);
 870         if (r) {
 871                 kfree(rd);
 872                 return r;
 873         }
 874
 875         /* This would make this whole thing pointless */
 876         if (!last_request->intersect)
 877                 BUG_ON(rd != cfg80211_regdomain);
 878
 879         /* update all wiphys now with the new established regulatory domain */
 880         update_all_wiphy_regulatory(last_request->initiator);
 881
 882         print_regdomain(cfg80211_regdomain);
 883
 884         return r;
 885 }
 886
 887 int regulatory_init(void)
 888 {
 889         int err;
 890
 891         reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
 892         if (IS_ERR(reg_pdev))
 893                 return PTR_ERR(reg_pdev);
 894
 895 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
 896         cfg80211_regdomain = static_regdom(ieee80211_regdom);
 897
 898         printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
 899         print_regdomain_info(cfg80211_regdomain);
 900         /* The old code still requests for a new regdomain and if
 901          * you have CRDA you get it updated, otherwise you get
 902          * stuck with the static values. We ignore "EU" code as
 903          * that is not a valid ISO / IEC 3166 alpha2 */
 904         if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
 905                 err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE,
 906                                         ieee80211_regdom);
 907 #else
 908         cfg80211_regdomain = cfg80211_world_regdom;
 909
 910         err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00");
 911         if (err)
 912                 printk(KERN_ERR "cfg80211: calling CRDA failed - "
 913                        "unable to update world regulatory domain, "
 914                        "using static definition\n");
 915 #endif
 916
 917         return 0;
 918 }
 919
 920 void regulatory_exit(void)
 921 {
 922         mutex_lock(&cfg80211_drv_mutex);
 923
 924         reset_regdomains();
 925
 926         kfree(last_request);
 927
 928         platform_device_unregister(reg_pdev);
 929
 930         mutex_unlock(&cfg80211_drv_mutex);
 931 }