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reg.c
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1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2007 Johannes Berg <[email protected]>
5  * Copyright 2008-2011 Luis R. Rodriguez <[email protected]>
6  *
7  * Permission to use, copy, modify, and/or distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18  */
19 
20 
45 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46 
47 #include <linux/kernel.h>
48 #include <linux/export.h>
49 #include <linux/slab.h>
50 #include <linux/list.h>
51 #include <linux/random.h>
52 #include <linux/ctype.h>
53 #include <linux/nl80211.h>
54 #include <linux/platform_device.h>
55 #include <linux/moduleparam.h>
56 #include <net/cfg80211.h>
57 #include "core.h"
58 #include "reg.h"
59 #include "regdb.h"
60 #include "nl80211.h"
61 
62 #ifdef CONFIG_CFG80211_REG_DEBUG
63 #define REG_DBG_PRINT(format, args...) \
64  printk(KERN_DEBUG pr_fmt(format), ##args)
65 #else
66 #define REG_DBG_PRINT(args...)
67 #endif
68 
69 static struct regulatory_request core_request_world = {
70  .initiator = NL80211_REGDOM_SET_BY_CORE,
71  .alpha2[0] = '0',
72  .alpha2[1] = '0',
73  .intersect = false,
74  .processed = true,
75  .country_ie_env = ENVIRON_ANY,
76 };
77 
78 /* Receipt of information from last regulatory request */
79 static struct regulatory_request *last_request = &core_request_world;
80 
81 /* To trigger userspace events */
82 static struct platform_device *reg_pdev;
83 
84 static struct device_type reg_device_type = {
85  .uevent = reg_device_uevent,
86 };
87 
88 /*
89  * Central wireless core regulatory domains, we only need two,
90  * the current one and a world regulatory domain in case we have no
91  * information to give us an alpha2
92  */
94 
95 /*
96  * Protects static reg.c components:
97  * - cfg80211_world_regdom
98  * - cfg80211_regdom
99  * - last_request
100  * - reg_num_devs_support_basehint
101  */
102 static DEFINE_MUTEX(reg_mutex);
103 
104 /*
105  * Number of devices that registered to the core
106  * that support cellular base station regulatory hints
107  */
108 static int reg_num_devs_support_basehint;
109 
110 static inline void assert_reg_lock(void)
111 {
113 }
114 
115 /* Used to queue up regulatory hints */
116 static LIST_HEAD(reg_requests_list);
117 static spinlock_t reg_requests_lock;
118 
119 /* Used to queue up beacon hints for review */
120 static LIST_HEAD(reg_pending_beacons);
121 static spinlock_t reg_pending_beacons_lock;
122 
123 /* Used to keep track of processed beacon hints */
124 static LIST_HEAD(reg_beacon_list);
125 
126 struct reg_beacon {
127  struct list_head list;
129 };
130 
131 static void reg_todo(struct work_struct *work);
132 static DECLARE_WORK(reg_work, reg_todo);
133 
134 static void reg_timeout_work(struct work_struct *work);
135 static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
136 
137 /* We keep a static world regulatory domain in case of the absence of CRDA */
138 static const struct ieee80211_regdomain world_regdom = {
139  .n_reg_rules = 6,
140  .alpha2 = "00",
141  .reg_rules = {
142  /* IEEE 802.11b/g, channels 1..11 */
143  REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
144  /* IEEE 802.11b/g, channels 12..13. */
145  REG_RULE(2467-10, 2472+10, 40, 6, 20,
148  /* IEEE 802.11 channel 14 - Only JP enables
149  * this and for 802.11b only */
150  REG_RULE(2484-10, 2484+10, 20, 6, 20,
154  /* IEEE 802.11a, channel 36..48 */
155  REG_RULE(5180-10, 5240+10, 40, 6, 20,
158 
159  /* NB: 5260 MHz - 5700 MHz requies DFS */
160 
161  /* IEEE 802.11a, channel 149..165 */
162  REG_RULE(5745-10, 5825+10, 40, 6, 20,
165 
166  /* IEEE 802.11ad (60gHz), channels 1..3 */
167  REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
168  }
169 };
170 
171 static const struct ieee80211_regdomain *cfg80211_world_regdom =
172  &world_regdom;
173 
174 static char *ieee80211_regdom = "00";
175 static char user_alpha2[2];
176 
177 module_param(ieee80211_regdom, charp, 0444);
178 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
179 
180 static void reset_regdomains(bool full_reset)
181 {
182  /* avoid freeing static information or freeing something twice */
183  if (cfg80211_regdomain == cfg80211_world_regdom)
184  cfg80211_regdomain = NULL;
185  if (cfg80211_world_regdom == &world_regdom)
186  cfg80211_world_regdom = NULL;
187  if (cfg80211_regdomain == &world_regdom)
188  cfg80211_regdomain = NULL;
189 
190  kfree(cfg80211_regdomain);
191  kfree(cfg80211_world_regdom);
192 
193  cfg80211_world_regdom = &world_regdom;
194  cfg80211_regdomain = NULL;
195 
196  if (!full_reset)
197  return;
198 
199  if (last_request != &core_request_world)
200  kfree(last_request);
201  last_request = &core_request_world;
202 }
203 
204 /*
205  * Dynamic world regulatory domain requested by the wireless
206  * core upon initialization
207  */
208 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
209 {
210  BUG_ON(!last_request);
211 
212  reset_regdomains(false);
213 
214  cfg80211_world_regdom = rd;
215  cfg80211_regdomain = rd;
216 }
217 
218 bool is_world_regdom(const char *alpha2)
219 {
220  if (!alpha2)
221  return false;
222  if (alpha2[0] == '0' && alpha2[1] == '0')
223  return true;
224  return false;
225 }
226 
227 static bool is_alpha2_set(const char *alpha2)
228 {
229  if (!alpha2)
230  return false;
231  if (alpha2[0] != 0 && alpha2[1] != 0)
232  return true;
233  return false;
234 }
235 
236 static bool is_unknown_alpha2(const char *alpha2)
237 {
238  if (!alpha2)
239  return false;
240  /*
241  * Special case where regulatory domain was built by driver
242  * but a specific alpha2 cannot be determined
243  */
244  if (alpha2[0] == '9' && alpha2[1] == '9')
245  return true;
246  return false;
247 }
248 
249 static bool is_intersected_alpha2(const char *alpha2)
250 {
251  if (!alpha2)
252  return false;
253  /*
254  * Special case where regulatory domain is the
255  * result of an intersection between two regulatory domain
256  * structures
257  */
258  if (alpha2[0] == '9' && alpha2[1] == '8')
259  return true;
260  return false;
261 }
262 
263 static bool is_an_alpha2(const char *alpha2)
264 {
265  if (!alpha2)
266  return false;
267  if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
268  return true;
269  return false;
270 }
271 
272 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
273 {
274  if (!alpha2_x || !alpha2_y)
275  return false;
276  if (alpha2_x[0] == alpha2_y[0] &&
277  alpha2_x[1] == alpha2_y[1])
278  return true;
279  return false;
280 }
281 
282 static bool regdom_changes(const char *alpha2)
283 {
284  assert_cfg80211_lock();
285 
286  if (!cfg80211_regdomain)
287  return true;
288  if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
289  return false;
290  return true;
291 }
292 
293 /*
294  * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
295  * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
296  * has ever been issued.
297  */
298 static bool is_user_regdom_saved(void)
299 {
300  if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
301  return false;
302 
303  /* This would indicate a mistake on the design */
304  if (WARN((!is_world_regdom(user_alpha2) &&
305  !is_an_alpha2(user_alpha2)),
306  "Unexpected user alpha2: %c%c\n",
307  user_alpha2[0],
308  user_alpha2[1]))
309  return false;
310 
311  return true;
312 }
313 
314 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
315  const struct ieee80211_regdomain *src_regd)
316 {
317  struct ieee80211_regdomain *regd;
318  int size_of_regd = 0;
319  unsigned int i;
320 
321  size_of_regd = sizeof(struct ieee80211_regdomain) +
322  ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
323 
324  regd = kzalloc(size_of_regd, GFP_KERNEL);
325  if (!regd)
326  return -ENOMEM;
327 
328  memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
329 
330  for (i = 0; i < src_regd->n_reg_rules; i++)
331  memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
332  sizeof(struct ieee80211_reg_rule));
333 
334  *dst_regd = regd;
335  return 0;
336 }
337 
338 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
339 struct reg_regdb_search_request {
340  char alpha2[2];
341  struct list_head list;
342 };
343 
344 static LIST_HEAD(reg_regdb_search_list);
345 static DEFINE_MUTEX(reg_regdb_search_mutex);
346 
347 static void reg_regdb_search(struct work_struct *work)
348 {
349  struct reg_regdb_search_request *request;
350  const struct ieee80211_regdomain *curdom, *regdom;
351  int i, r;
352  bool set_reg = false;
353 
354  mutex_lock(&cfg80211_mutex);
355 
356  mutex_lock(&reg_regdb_search_mutex);
357  while (!list_empty(&reg_regdb_search_list)) {
358  request = list_first_entry(&reg_regdb_search_list,
359  struct reg_regdb_search_request,
360  list);
361  list_del(&request->list);
362 
363  for (i=0; i<reg_regdb_size; i++) {
364  curdom = reg_regdb[i];
365 
366  if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
367  r = reg_copy_regd(&regdom, curdom);
368  if (r)
369  break;
370  set_reg = true;
371  break;
372  }
373  }
374 
375  kfree(request);
376  }
377  mutex_unlock(&reg_regdb_search_mutex);
378 
379  if (set_reg)
380  set_regdom(regdom);
381 
382  mutex_unlock(&cfg80211_mutex);
383 }
384 
385 static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
386 
387 static void reg_regdb_query(const char *alpha2)
388 {
389  struct reg_regdb_search_request *request;
390 
391  if (!alpha2)
392  return;
393 
394  request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
395  if (!request)
396  return;
397 
398  memcpy(request->alpha2, alpha2, 2);
399 
400  mutex_lock(&reg_regdb_search_mutex);
401  list_add_tail(&request->list, &reg_regdb_search_list);
402  mutex_unlock(&reg_regdb_search_mutex);
403 
404  schedule_work(&reg_regdb_work);
405 }
406 
407 /* Feel free to add any other sanity checks here */
408 static void reg_regdb_size_check(void)
409 {
410  /* We should ideally BUILD_BUG_ON() but then random builds would fail */
411  WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
412 }
413 #else
414 static inline void reg_regdb_size_check(void) {}
415 static inline void reg_regdb_query(const char *alpha2) {}
416 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
417 
418 /*
419  * This lets us keep regulatory code which is updated on a regulatory
420  * basis in userspace. Country information is filled in by
421  * reg_device_uevent
422  */
423 static int call_crda(const char *alpha2)
424 {
425  if (!is_world_regdom((char *) alpha2))
426  pr_info("Calling CRDA for country: %c%c\n",
427  alpha2[0], alpha2[1]);
428  else
429  pr_info("Calling CRDA to update world regulatory domain\n");
430 
431  /* query internal regulatory database (if it exists) */
432  reg_regdb_query(alpha2);
433 
434  return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
435 }
436 
437 /* Used by nl80211 before kmalloc'ing our regulatory domain */
438 bool reg_is_valid_request(const char *alpha2)
439 {
440  assert_cfg80211_lock();
441 
442  if (!last_request)
443  return false;
444 
445  return alpha2_equal(last_request->alpha2, alpha2);
446 }
447 
448 /* Sanity check on a regulatory rule */
449 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
450 {
451  const struct ieee80211_freq_range *freq_range = &rule->freq_range;
452  u32 freq_diff;
453 
454  if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
455  return false;
456 
457  if (freq_range->start_freq_khz > freq_range->end_freq_khz)
458  return false;
459 
460  freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
461 
462  if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
463  freq_range->max_bandwidth_khz > freq_diff)
464  return false;
465 
466  return true;
467 }
468 
469 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
470 {
471  const struct ieee80211_reg_rule *reg_rule = NULL;
472  unsigned int i;
473 
474  if (!rd->n_reg_rules)
475  return false;
476 
478  return false;
479 
480  for (i = 0; i < rd->n_reg_rules; i++) {
481  reg_rule = &rd->reg_rules[i];
482  if (!is_valid_reg_rule(reg_rule))
483  return false;
484  }
485 
486  return true;
487 }
488 
489 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
490  u32 center_freq_khz,
491  u32 bw_khz)
492 {
493  u32 start_freq_khz, end_freq_khz;
494 
495  start_freq_khz = center_freq_khz - (bw_khz/2);
496  end_freq_khz = center_freq_khz + (bw_khz/2);
497 
498  if (start_freq_khz >= freq_range->start_freq_khz &&
499  end_freq_khz <= freq_range->end_freq_khz)
500  return true;
501 
502  return false;
503 }
504 
520 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
521  u32 freq_khz)
522 {
523 #define ONE_GHZ_IN_KHZ 1000000
524  /*
525  * From 802.11ad: directional multi-gigabit (DMG):
526  * Pertaining to operation in a frequency band containing a channel
527  * with the Channel starting frequency above 45 GHz.
528  */
529  u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
530  10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
531  if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
532  return true;
533  if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
534  return true;
535  return false;
536 #undef ONE_GHZ_IN_KHZ
537 }
538 
539 /*
540  * Helper for regdom_intersect(), this does the real
541  * mathematical intersection fun
542  */
543 static int reg_rules_intersect(
544  const struct ieee80211_reg_rule *rule1,
545  const struct ieee80211_reg_rule *rule2,
546  struct ieee80211_reg_rule *intersected_rule)
547 {
548  const struct ieee80211_freq_range *freq_range1, *freq_range2;
549  struct ieee80211_freq_range *freq_range;
550  const struct ieee80211_power_rule *power_rule1, *power_rule2;
551  struct ieee80211_power_rule *power_rule;
552  u32 freq_diff;
553 
554  freq_range1 = &rule1->freq_range;
555  freq_range2 = &rule2->freq_range;
556  freq_range = &intersected_rule->freq_range;
557 
558  power_rule1 = &rule1->power_rule;
559  power_rule2 = &rule2->power_rule;
560  power_rule = &intersected_rule->power_rule;
561 
562  freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
563  freq_range2->start_freq_khz);
564  freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
565  freq_range2->end_freq_khz);
566  freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
567  freq_range2->max_bandwidth_khz);
568 
569  freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
570  if (freq_range->max_bandwidth_khz > freq_diff)
571  freq_range->max_bandwidth_khz = freq_diff;
572 
573  power_rule->max_eirp = min(power_rule1->max_eirp,
574  power_rule2->max_eirp);
575  power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
576  power_rule2->max_antenna_gain);
577 
578  intersected_rule->flags = (rule1->flags | rule2->flags);
579 
580  if (!is_valid_reg_rule(intersected_rule))
581  return -EINVAL;
582 
583  return 0;
584 }
585 
599 static struct ieee80211_regdomain *regdom_intersect(
600  const struct ieee80211_regdomain *rd1,
601  const struct ieee80211_regdomain *rd2)
602 {
603  int r, size_of_regd;
604  unsigned int x, y;
605  unsigned int num_rules = 0, rule_idx = 0;
606  const struct ieee80211_reg_rule *rule1, *rule2;
607  struct ieee80211_reg_rule *intersected_rule;
608  struct ieee80211_regdomain *rd;
609  /* This is just a dummy holder to help us count */
610  struct ieee80211_reg_rule irule;
611 
612  /* Uses the stack temporarily for counter arithmetic */
613  intersected_rule = &irule;
614 
615  memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
616 
617  if (!rd1 || !rd2)
618  return NULL;
619 
620  /*
621  * First we get a count of the rules we'll need, then we actually
622  * build them. This is to so we can malloc() and free() a
623  * regdomain once. The reason we use reg_rules_intersect() here
624  * is it will return -EINVAL if the rule computed makes no sense.
625  * All rules that do check out OK are valid.
626  */
627 
628  for (x = 0; x < rd1->n_reg_rules; x++) {
629  rule1 = &rd1->reg_rules[x];
630  for (y = 0; y < rd2->n_reg_rules; y++) {
631  rule2 = &rd2->reg_rules[y];
632  if (!reg_rules_intersect(rule1, rule2,
633  intersected_rule))
634  num_rules++;
635  memset(intersected_rule, 0,
636  sizeof(struct ieee80211_reg_rule));
637  }
638  }
639 
640  if (!num_rules)
641  return NULL;
642 
643  size_of_regd = sizeof(struct ieee80211_regdomain) +
644  ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
645 
646  rd = kzalloc(size_of_regd, GFP_KERNEL);
647  if (!rd)
648  return NULL;
649 
650  for (x = 0; x < rd1->n_reg_rules; x++) {
651  rule1 = &rd1->reg_rules[x];
652  for (y = 0; y < rd2->n_reg_rules; y++) {
653  rule2 = &rd2->reg_rules[y];
654  /*
655  * This time around instead of using the stack lets
656  * write to the target rule directly saving ourselves
657  * a memcpy()
658  */
659  intersected_rule = &rd->reg_rules[rule_idx];
660  r = reg_rules_intersect(rule1, rule2,
661  intersected_rule);
662  /*
663  * No need to memset here the intersected rule here as
664  * we're not using the stack anymore
665  */
666  if (r)
667  continue;
668  rule_idx++;
669  }
670  }
671 
672  if (rule_idx != num_rules) {
673  kfree(rd);
674  return NULL;
675  }
676 
677  rd->n_reg_rules = num_rules;
678  rd->alpha2[0] = '9';
679  rd->alpha2[1] = '8';
680 
681  return rd;
682 }
683 
684 /*
685  * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
686  * want to just have the channel structure use these
687  */
688 static u32 map_regdom_flags(u32 rd_flags)
689 {
690  u32 channel_flags = 0;
691  if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
692  channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
693  if (rd_flags & NL80211_RRF_NO_IBSS)
694  channel_flags |= IEEE80211_CHAN_NO_IBSS;
695  if (rd_flags & NL80211_RRF_DFS)
696  channel_flags |= IEEE80211_CHAN_RADAR;
697  if (rd_flags & NL80211_RRF_NO_OFDM)
698  channel_flags |= IEEE80211_CHAN_NO_OFDM;
699  return channel_flags;
700 }
701 
702 static int freq_reg_info_regd(struct wiphy *wiphy,
703  u32 center_freq,
704  u32 desired_bw_khz,
705  const struct ieee80211_reg_rule **reg_rule,
706  const struct ieee80211_regdomain *custom_regd)
707 {
708  int i;
709  bool band_rule_found = false;
710  const struct ieee80211_regdomain *regd;
711  bool bw_fits = false;
712 
713  if (!desired_bw_khz)
714  desired_bw_khz = MHZ_TO_KHZ(20);
715 
716  regd = custom_regd ? custom_regd : cfg80211_regdomain;
717 
718  /*
719  * Follow the driver's regulatory domain, if present, unless a country
720  * IE has been processed or a user wants to help complaince further
721  */
722  if (!custom_regd &&
723  last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
724  last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
725  wiphy->regd)
726  regd = wiphy->regd;
727 
728  if (!regd)
729  return -EINVAL;
730 
731  for (i = 0; i < regd->n_reg_rules; i++) {
732  const struct ieee80211_reg_rule *rr;
733  const struct ieee80211_freq_range *fr = NULL;
734 
735  rr = &regd->reg_rules[i];
736  fr = &rr->freq_range;
737 
738  /*
739  * We only need to know if one frequency rule was
740  * was in center_freq's band, that's enough, so lets
741  * not overwrite it once found
742  */
743  if (!band_rule_found)
744  band_rule_found = freq_in_rule_band(fr, center_freq);
745 
746  bw_fits = reg_does_bw_fit(fr,
747  center_freq,
748  desired_bw_khz);
749 
750  if (band_rule_found && bw_fits) {
751  *reg_rule = rr;
752  return 0;
753  }
754  }
755 
756  if (!band_rule_found)
757  return -ERANGE;
758 
759  return -EINVAL;
760 }
761 
762 int freq_reg_info(struct wiphy *wiphy,
763  u32 center_freq,
764  u32 desired_bw_khz,
765  const struct ieee80211_reg_rule **reg_rule)
766 {
767  assert_cfg80211_lock();
768  return freq_reg_info_regd(wiphy,
769  center_freq,
770  desired_bw_khz,
771  reg_rule,
772  NULL);
773 }
775 
776 #ifdef CONFIG_CFG80211_REG_DEBUG
777 static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
778 {
779  switch (initiator) {
781  return "Set by core";
783  return "Set by user";
785  return "Set by driver";
787  return "Set by country IE";
788  default:
789  WARN_ON(1);
790  return "Set by bug";
791  }
792 }
793 
794 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
795  u32 desired_bw_khz,
796  const struct ieee80211_reg_rule *reg_rule)
797 {
798  const struct ieee80211_power_rule *power_rule;
799  const struct ieee80211_freq_range *freq_range;
800  char max_antenna_gain[32];
801 
802  power_rule = &reg_rule->power_rule;
803  freq_range = &reg_rule->freq_range;
804 
805  if (!power_rule->max_antenna_gain)
806  snprintf(max_antenna_gain, 32, "N/A");
807  else
808  snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
809 
810  REG_DBG_PRINT("Updating information on frequency %d MHz "
811  "for a %d MHz width channel with regulatory rule:\n",
812  chan->center_freq,
813  KHZ_TO_MHZ(desired_bw_khz));
814 
815  REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
816  freq_range->start_freq_khz,
817  freq_range->end_freq_khz,
818  freq_range->max_bandwidth_khz,
819  max_antenna_gain,
820  power_rule->max_eirp);
821 }
822 #else
823 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
824  u32 desired_bw_khz,
825  const struct ieee80211_reg_rule *reg_rule)
826 {
827  return;
828 }
829 #endif
830 
831 /*
832  * Note that right now we assume the desired channel bandwidth
833  * is always 20 MHz for each individual channel (HT40 uses 20 MHz
834  * per channel, the primary and the extension channel). To support
835  * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
836  * new ieee80211_channel.target_bw and re run the regulatory check
837  * on the wiphy with the target_bw specified. Then we can simply use
838  * that below for the desired_bw_khz below.
839  */
840 static void handle_channel(struct wiphy *wiphy,
841  enum nl80211_reg_initiator initiator,
842  enum ieee80211_band band,
843  unsigned int chan_idx)
844 {
845  int r;
846  u32 flags, bw_flags = 0;
847  u32 desired_bw_khz = MHZ_TO_KHZ(20);
848  const struct ieee80211_reg_rule *reg_rule = NULL;
849  const struct ieee80211_power_rule *power_rule = NULL;
850  const struct ieee80211_freq_range *freq_range = NULL;
851  struct ieee80211_supported_band *sband;
852  struct ieee80211_channel *chan;
853  struct wiphy *request_wiphy = NULL;
854 
855  assert_cfg80211_lock();
856 
857  request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
858 
859  sband = wiphy->bands[band];
860  BUG_ON(chan_idx >= sband->n_channels);
861  chan = &sband->channels[chan_idx];
862 
863  flags = chan->orig_flags;
864 
865  r = freq_reg_info(wiphy,
866  MHZ_TO_KHZ(chan->center_freq),
867  desired_bw_khz,
868  &reg_rule);
869 
870  if (r) {
871  /*
872  * We will disable all channels that do not match our
873  * received regulatory rule unless the hint is coming
874  * from a Country IE and the Country IE had no information
875  * about a band. The IEEE 802.11 spec allows for an AP
876  * to send only a subset of the regulatory rules allowed,
877  * so an AP in the US that only supports 2.4 GHz may only send
878  * a country IE with information for the 2.4 GHz band
879  * while 5 GHz is still supported.
880  */
881  if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
882  r == -ERANGE)
883  return;
884 
885  REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
887  return;
888  }
889 
890  chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
891 
892  power_rule = &reg_rule->power_rule;
893  freq_range = &reg_rule->freq_range;
894 
895  if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
896  bw_flags = IEEE80211_CHAN_NO_HT40;
897 
898  if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
899  request_wiphy && request_wiphy == wiphy &&
900  request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
901  /*
902  * This guarantees the driver's requested regulatory domain
903  * will always be used as a base for further regulatory
904  * settings
905  */
906  chan->flags = chan->orig_flags =
907  map_regdom_flags(reg_rule->flags) | bw_flags;
908  chan->max_antenna_gain = chan->orig_mag =
909  (int) MBI_TO_DBI(power_rule->max_antenna_gain);
910  chan->max_reg_power = chan->max_power = chan->orig_mpwr =
911  (int) MBM_TO_DBM(power_rule->max_eirp);
912  return;
913  }
914 
915  chan->beacon_found = false;
916  chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
917  chan->max_antenna_gain = min(chan->orig_mag,
918  (int) MBI_TO_DBI(power_rule->max_antenna_gain));
919  chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
920  if (chan->orig_mpwr) {
921  /*
922  * Devices that have their own custom regulatory domain
923  * but also use WIPHY_FLAG_STRICT_REGULATORY will follow the
924  * passed country IE power settings.
925  */
926  if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
929  chan->max_power = chan->max_reg_power;
930  else
931  chan->max_power = min(chan->orig_mpwr,
932  chan->max_reg_power);
933  } else
934  chan->max_power = chan->max_reg_power;
935 }
936 
937 static void handle_band(struct wiphy *wiphy,
938  enum ieee80211_band band,
939  enum nl80211_reg_initiator initiator)
940 {
941  unsigned int i;
942  struct ieee80211_supported_band *sband;
943 
944  BUG_ON(!wiphy->bands[band]);
945  sband = wiphy->bands[band];
946 
947  for (i = 0; i < sband->n_channels; i++)
948  handle_channel(wiphy, initiator, band, i);
949 }
950 
951 static bool reg_request_cell_base(struct regulatory_request *request)
952 {
953  if (request->initiator != NL80211_REGDOM_SET_BY_USER)
954  return false;
956  return false;
957  return true;
958 }
959 
961 {
962  bool val;
963  assert_cfg80211_lock();
964 
966  val = reg_request_cell_base(last_request);
968  return val;
969 }
970 
971 #ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
972 
973 /* Core specific check */
974 static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
975 {
976  if (!reg_num_devs_support_basehint)
977  return -EOPNOTSUPP;
978 
979  if (reg_request_cell_base(last_request)) {
980  if (!regdom_changes(pending_request->alpha2))
981  return -EALREADY;
982  return 0;
983  }
984  return 0;
985 }
986 
987 /* Device specific check */
988 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
989 {
991  return true;
992  return false;
993 }
994 #else
995 static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
996 {
997  return -EOPNOTSUPP;
998 }
999 static int reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1000 {
1001  return true;
1002 }
1003 #endif
1004 
1005 
1006 static bool ignore_reg_update(struct wiphy *wiphy,
1007  enum nl80211_reg_initiator initiator)
1008 {
1009  if (!last_request) {
1010  REG_DBG_PRINT("Ignoring regulatory request %s since "
1011  "last_request is not set\n",
1012  reg_initiator_name(initiator));
1013  return true;
1014  }
1015 
1016  if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1018  REG_DBG_PRINT("Ignoring regulatory request %s "
1019  "since the driver uses its own custom "
1020  "regulatory domain\n",
1021  reg_initiator_name(initiator));
1022  return true;
1023  }
1024 
1025  /*
1026  * wiphy->regd will be set once the device has its own
1027  * desired regulatory domain set
1028  */
1029  if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
1030  initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1031  !is_world_regdom(last_request->alpha2)) {
1032  REG_DBG_PRINT("Ignoring regulatory request %s "
1033  "since the driver requires its own regulatory "
1034  "domain to be set first\n",
1035  reg_initiator_name(initiator));
1036  return true;
1037  }
1038 
1039  if (reg_request_cell_base(last_request))
1040  return reg_dev_ignore_cell_hint(wiphy);
1041 
1042  return false;
1043 }
1044 
1045 static void handle_reg_beacon(struct wiphy *wiphy,
1046  unsigned int chan_idx,
1047  struct reg_beacon *reg_beacon)
1048 {
1049  struct ieee80211_supported_band *sband;
1050  struct ieee80211_channel *chan;
1051  bool channel_changed = false;
1052  struct ieee80211_channel chan_before;
1053 
1054  assert_cfg80211_lock();
1055 
1056  sband = wiphy->bands[reg_beacon->chan.band];
1057  chan = &sband->channels[chan_idx];
1058 
1059  if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1060  return;
1061 
1062  if (chan->beacon_found)
1063  return;
1064 
1065  chan->beacon_found = true;
1066 
1068  return;
1069 
1070  chan_before.center_freq = chan->center_freq;
1071  chan_before.flags = chan->flags;
1072 
1073  if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
1075  channel_changed = true;
1076  }
1077 
1078  if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
1079  chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
1080  channel_changed = true;
1081  }
1082 
1083  if (channel_changed)
1084  nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1085 }
1086 
1087 /*
1088  * Called when a scan on a wiphy finds a beacon on
1089  * new channel
1090  */
1091 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1092  struct reg_beacon *reg_beacon)
1093 {
1094  unsigned int i;
1095  struct ieee80211_supported_band *sband;
1096 
1097  assert_cfg80211_lock();
1098 
1099  if (!wiphy->bands[reg_beacon->chan.band])
1100  return;
1101 
1102  sband = wiphy->bands[reg_beacon->chan.band];
1103 
1104  for (i = 0; i < sband->n_channels; i++)
1105  handle_reg_beacon(wiphy, i, reg_beacon);
1106 }
1107 
1108 /*
1109  * Called upon reg changes or a new wiphy is added
1110  */
1111 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1112 {
1113  unsigned int i;
1114  struct ieee80211_supported_band *sband;
1115  struct reg_beacon *reg_beacon;
1116 
1117  assert_cfg80211_lock();
1118 
1119  if (list_empty(&reg_beacon_list))
1120  return;
1121 
1122  list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1123  if (!wiphy->bands[reg_beacon->chan.band])
1124  continue;
1125  sband = wiphy->bands[reg_beacon->chan.band];
1126  for (i = 0; i < sband->n_channels; i++)
1127  handle_reg_beacon(wiphy, i, reg_beacon);
1128  }
1129 }
1130 
1131 static bool reg_is_world_roaming(struct wiphy *wiphy)
1132 {
1133  if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1134  (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1135  return true;
1136  if (last_request &&
1137  last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1139  return true;
1140  return false;
1141 }
1142 
1143 /* Reap the advantages of previously found beacons */
1144 static void reg_process_beacons(struct wiphy *wiphy)
1145 {
1146  /*
1147  * Means we are just firing up cfg80211, so no beacons would
1148  * have been processed yet.
1149  */
1150  if (!last_request)
1151  return;
1152  if (!reg_is_world_roaming(wiphy))
1153  return;
1154  wiphy_update_beacon_reg(wiphy);
1155 }
1156 
1157 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1158 {
1159  if (!chan)
1160  return true;
1161  if (chan->flags & IEEE80211_CHAN_DISABLED)
1162  return true;
1163  /* This would happen when regulatory rules disallow HT40 completely */
1165  return true;
1166  return false;
1167 }
1168 
1169 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1170  enum ieee80211_band band,
1171  unsigned int chan_idx)
1172 {
1173  struct ieee80211_supported_band *sband;
1174  struct ieee80211_channel *channel;
1175  struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1176  unsigned int i;
1177 
1178  assert_cfg80211_lock();
1179 
1180  sband = wiphy->bands[band];
1181  BUG_ON(chan_idx >= sband->n_channels);
1182  channel = &sband->channels[chan_idx];
1183 
1184  if (is_ht40_not_allowed(channel)) {
1185  channel->flags |= IEEE80211_CHAN_NO_HT40;
1186  return;
1187  }
1188 
1189  /*
1190  * We need to ensure the extension channels exist to
1191  * be able to use HT40- or HT40+, this finds them (or not)
1192  */
1193  for (i = 0; i < sband->n_channels; i++) {
1194  struct ieee80211_channel *c = &sband->channels[i];
1195  if (c->center_freq == (channel->center_freq - 20))
1196  channel_before = c;
1197  if (c->center_freq == (channel->center_freq + 20))
1198  channel_after = c;
1199  }
1200 
1201  /*
1202  * Please note that this assumes target bandwidth is 20 MHz,
1203  * if that ever changes we also need to change the below logic
1204  * to include that as well.
1205  */
1206  if (is_ht40_not_allowed(channel_before))
1207  channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1208  else
1209  channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1210 
1211  if (is_ht40_not_allowed(channel_after))
1212  channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1213  else
1214  channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1215 }
1216 
1217 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1218  enum ieee80211_band band)
1219 {
1220  unsigned int i;
1221  struct ieee80211_supported_band *sband;
1222 
1223  BUG_ON(!wiphy->bands[band]);
1224  sband = wiphy->bands[band];
1225 
1226  for (i = 0; i < sband->n_channels; i++)
1227  reg_process_ht_flags_channel(wiphy, band, i);
1228 }
1229 
1230 static void reg_process_ht_flags(struct wiphy *wiphy)
1231 {
1232  enum ieee80211_band band;
1233 
1234  if (!wiphy)
1235  return;
1236 
1237  for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1238  if (wiphy->bands[band])
1239  reg_process_ht_flags_band(wiphy, band);
1240  }
1241 
1242 }
1243 
1244 static void wiphy_update_regulatory(struct wiphy *wiphy,
1245  enum nl80211_reg_initiator initiator)
1246 {
1247  enum ieee80211_band band;
1248 
1249  assert_reg_lock();
1250 
1251  if (ignore_reg_update(wiphy, initiator))
1252  return;
1253 
1254  last_request->dfs_region = cfg80211_regdomain->dfs_region;
1255 
1256  for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1257  if (wiphy->bands[band])
1258  handle_band(wiphy, band, initiator);
1259  }
1260 
1261  reg_process_beacons(wiphy);
1262  reg_process_ht_flags(wiphy);
1263  if (wiphy->reg_notifier)
1264  wiphy->reg_notifier(wiphy, last_request);
1265 }
1266 
1267 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1268 {
1270  struct wiphy *wiphy;
1271 
1272  list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1273  wiphy = &rdev->wiphy;
1274  wiphy_update_regulatory(wiphy, initiator);
1275  /*
1276  * Regulatory updates set by CORE are ignored for custom
1277  * regulatory cards. Let us notify the changes to the driver,
1278  * as some drivers used this to restore its orig_* reg domain.
1279  */
1280  if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1282  wiphy->reg_notifier)
1283  wiphy->reg_notifier(wiphy, last_request);
1284  }
1285 }
1286 
1287 static void handle_channel_custom(struct wiphy *wiphy,
1288  enum ieee80211_band band,
1289  unsigned int chan_idx,
1290  const struct ieee80211_regdomain *regd)
1291 {
1292  int r;
1293  u32 desired_bw_khz = MHZ_TO_KHZ(20);
1294  u32 bw_flags = 0;
1295  const struct ieee80211_reg_rule *reg_rule = NULL;
1296  const struct ieee80211_power_rule *power_rule = NULL;
1297  const struct ieee80211_freq_range *freq_range = NULL;
1298  struct ieee80211_supported_band *sband;
1299  struct ieee80211_channel *chan;
1300 
1301  assert_reg_lock();
1302 
1303  sband = wiphy->bands[band];
1304  BUG_ON(chan_idx >= sband->n_channels);
1305  chan = &sband->channels[chan_idx];
1306 
1307  r = freq_reg_info_regd(wiphy,
1308  MHZ_TO_KHZ(chan->center_freq),
1309  desired_bw_khz,
1310  &reg_rule,
1311  regd);
1312 
1313  if (r) {
1314  REG_DBG_PRINT("Disabling freq %d MHz as custom "
1315  "regd has no rule that fits a %d MHz "
1316  "wide channel\n",
1317  chan->center_freq,
1318  KHZ_TO_MHZ(desired_bw_khz));
1320  return;
1321  }
1322 
1323  chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1324 
1325  power_rule = &reg_rule->power_rule;
1326  freq_range = &reg_rule->freq_range;
1327 
1328  if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1329  bw_flags = IEEE80211_CHAN_NO_HT40;
1330 
1331  chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1332  chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1333  chan->max_reg_power = chan->max_power =
1334  (int) MBM_TO_DBM(power_rule->max_eirp);
1335 }
1336 
1337 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1338  const struct ieee80211_regdomain *regd)
1339 {
1340  unsigned int i;
1341  struct ieee80211_supported_band *sband;
1342 
1343  BUG_ON(!wiphy->bands[band]);
1344  sband = wiphy->bands[band];
1345 
1346  for (i = 0; i < sband->n_channels; i++)
1347  handle_channel_custom(wiphy, band, i, regd);
1348 }
1349 
1350 /* Used by drivers prior to wiphy registration */
1351 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1352  const struct ieee80211_regdomain *regd)
1353 {
1354  enum ieee80211_band band;
1355  unsigned int bands_set = 0;
1356 
1358  for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1359  if (!wiphy->bands[band])
1360  continue;
1361  handle_band_custom(wiphy, band, regd);
1362  bands_set++;
1363  }
1365 
1366  /*
1367  * no point in calling this if it won't have any effect
1368  * on your device's supportd bands.
1369  */
1370  WARN_ON(!bands_set);
1371 }
1373 
1374 /*
1375  * Return value which can be used by ignore_request() to indicate
1376  * it has been determined we should intersect two regulatory domains
1377  */
1378 #define REG_INTERSECT 1
1379 
1380 /* This has the logic which determines when a new request
1381  * should be ignored. */
1382 static int ignore_request(struct wiphy *wiphy,
1383  struct regulatory_request *pending_request)
1384 {
1385  struct wiphy *last_wiphy = NULL;
1386 
1387  assert_cfg80211_lock();
1388 
1389  /* All initial requests are respected */
1390  if (!last_request)
1391  return 0;
1392 
1393  switch (pending_request->initiator) {
1395  return 0;
1397 
1398  if (reg_request_cell_base(last_request)) {
1399  /* Trust a Cell base station over the AP's country IE */
1400  if (regdom_changes(pending_request->alpha2))
1401  return -EOPNOTSUPP;
1402  return -EALREADY;
1403  }
1404 
1405  last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1406 
1407  if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1408  return -EINVAL;
1409  if (last_request->initiator ==
1411  if (last_wiphy != wiphy) {
1412  /*
1413  * Two cards with two APs claiming different
1414  * Country IE alpha2s. We could
1415  * intersect them, but that seems unlikely
1416  * to be correct. Reject second one for now.
1417  */
1418  if (regdom_changes(pending_request->alpha2))
1419  return -EOPNOTSUPP;
1420  return -EALREADY;
1421  }
1422  /*
1423  * Two consecutive Country IE hints on the same wiphy.
1424  * This should be picked up early by the driver/stack
1425  */
1426  if (WARN_ON(regdom_changes(pending_request->alpha2)))
1427  return 0;
1428  return -EALREADY;
1429  }
1430  return 0;
1432  if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1433  if (regdom_changes(pending_request->alpha2))
1434  return 0;
1435  return -EALREADY;
1436  }
1437 
1438  /*
1439  * This would happen if you unplug and plug your card
1440  * back in or if you add a new device for which the previously
1441  * loaded card also agrees on the regulatory domain.
1442  */
1443  if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1444  !regdom_changes(pending_request->alpha2))
1445  return -EALREADY;
1446 
1447  return REG_INTERSECT;
1449  if (reg_request_cell_base(pending_request))
1450  return reg_ignore_cell_hint(pending_request);
1451 
1452  if (reg_request_cell_base(last_request))
1453  return -EOPNOTSUPP;
1454 
1455  if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1456  return REG_INTERSECT;
1457  /*
1458  * If the user knows better the user should set the regdom
1459  * to their country before the IE is picked up
1460  */
1461  if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1462  last_request->intersect)
1463  return -EOPNOTSUPP;
1464  /*
1465  * Process user requests only after previous user/driver/core
1466  * requests have been processed
1467  */
1468  if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1469  last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1470  last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1471  if (regdom_changes(last_request->alpha2))
1472  return -EAGAIN;
1473  }
1474 
1475  if (!regdom_changes(pending_request->alpha2))
1476  return -EALREADY;
1477 
1478  return 0;
1479  }
1480 
1481  return -EINVAL;
1482 }
1483 
1484 static void reg_set_request_processed(void)
1485 {
1486  bool need_more_processing = false;
1487 
1488  last_request->processed = true;
1489 
1490  spin_lock(&reg_requests_lock);
1491  if (!list_empty(&reg_requests_list))
1492  need_more_processing = true;
1493  spin_unlock(&reg_requests_lock);
1494 
1495  if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
1496  cancel_delayed_work(&reg_timeout);
1497 
1498  if (need_more_processing)
1499  schedule_work(&reg_work);
1500 }
1501 
1516 static int __regulatory_hint(struct wiphy *wiphy,
1517  struct regulatory_request *pending_request)
1518 {
1519  bool intersect = false;
1520  int r = 0;
1521 
1522  assert_cfg80211_lock();
1523 
1524  r = ignore_request(wiphy, pending_request);
1525 
1526  if (r == REG_INTERSECT) {
1527  if (pending_request->initiator ==
1529  r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1530  if (r) {
1531  kfree(pending_request);
1532  return r;
1533  }
1534  }
1535  intersect = true;
1536  } else if (r) {
1537  /*
1538  * If the regulatory domain being requested by the
1539  * driver has already been set just copy it to the
1540  * wiphy
1541  */
1542  if (r == -EALREADY &&
1543  pending_request->initiator ==
1545  r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1546  if (r) {
1547  kfree(pending_request);
1548  return r;
1549  }
1550  r = -EALREADY;
1551  goto new_request;
1552  }
1553  kfree(pending_request);
1554  return r;
1555  }
1556 
1557 new_request:
1558  if (last_request != &core_request_world)
1559  kfree(last_request);
1560 
1561  last_request = pending_request;
1562  last_request->intersect = intersect;
1563 
1564  pending_request = NULL;
1565 
1566  if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1567  user_alpha2[0] = last_request->alpha2[0];
1568  user_alpha2[1] = last_request->alpha2[1];
1569  }
1570 
1571  /* When r == REG_INTERSECT we do need to call CRDA */
1572  if (r < 0) {
1573  /*
1574  * Since CRDA will not be called in this case as we already
1575  * have applied the requested regulatory domain before we just
1576  * inform userspace we have processed the request
1577  */
1578  if (r == -EALREADY) {
1579  nl80211_send_reg_change_event(last_request);
1580  reg_set_request_processed();
1581  }
1582  return r;
1583  }
1584 
1585  return call_crda(last_request->alpha2);
1586 }
1587 
1588 /* This processes *all* regulatory hints */
1589 static void reg_process_hint(struct regulatory_request *reg_request,
1590  enum nl80211_reg_initiator reg_initiator)
1591 {
1592  int r = 0;
1593  struct wiphy *wiphy = NULL;
1594 
1595  BUG_ON(!reg_request->alpha2);
1596 
1597  if (wiphy_idx_valid(reg_request->wiphy_idx))
1598  wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1599 
1600  if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1601  !wiphy) {
1602  kfree(reg_request);
1603  return;
1604  }
1605 
1606  r = __regulatory_hint(wiphy, reg_request);
1607  /* This is required so that the orig_* parameters are saved */
1608  if (r == -EALREADY && wiphy &&
1610  wiphy_update_regulatory(wiphy, reg_initiator);
1611  return;
1612  }
1613 
1614  /*
1615  * We only time out user hints, given that they should be the only
1616  * source of bogus requests.
1617  */
1618  if (r != -EALREADY &&
1619  reg_initiator == NL80211_REGDOM_SET_BY_USER)
1620  schedule_delayed_work(&reg_timeout, msecs_to_jiffies(3142));
1621 }
1622 
1623 /*
1624  * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1625  * Regulatory hints come on a first come first serve basis and we
1626  * must process each one atomically.
1627  */
1628 static void reg_process_pending_hints(void)
1629 {
1630  struct regulatory_request *reg_request;
1631 
1632  mutex_lock(&cfg80211_mutex);
1634 
1635  /* When last_request->processed becomes true this will be rescheduled */
1636  if (last_request && !last_request->processed) {
1637  REG_DBG_PRINT("Pending regulatory request, waiting "
1638  "for it to be processed...\n");
1639  goto out;
1640  }
1641 
1642  spin_lock(&reg_requests_lock);
1643 
1644  if (list_empty(&reg_requests_list)) {
1645  spin_unlock(&reg_requests_lock);
1646  goto out;
1647  }
1648 
1649  reg_request = list_first_entry(&reg_requests_list,
1650  struct regulatory_request,
1651  list);
1652  list_del_init(&reg_request->list);
1653 
1654  spin_unlock(&reg_requests_lock);
1655 
1656  reg_process_hint(reg_request, reg_request->initiator);
1657 
1658 out:
1660  mutex_unlock(&cfg80211_mutex);
1661 }
1662 
1663 /* Processes beacon hints -- this has nothing to do with country IEs */
1664 static void reg_process_pending_beacon_hints(void)
1665 {
1667  struct reg_beacon *pending_beacon, *tmp;
1668 
1669  /*
1670  * No need to hold the reg_mutex here as we just touch wiphys
1671  * and do not read or access regulatory variables.
1672  */
1673  mutex_lock(&cfg80211_mutex);
1674 
1675  /* This goes through the _pending_ beacon list */
1676  spin_lock_bh(&reg_pending_beacons_lock);
1677 
1678  if (list_empty(&reg_pending_beacons)) {
1679  spin_unlock_bh(&reg_pending_beacons_lock);
1680  goto out;
1681  }
1682 
1683  list_for_each_entry_safe(pending_beacon, tmp,
1684  &reg_pending_beacons, list) {
1685 
1686  list_del_init(&pending_beacon->list);
1687 
1688  /* Applies the beacon hint to current wiphys */
1689  list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1690  wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1691 
1692  /* Remembers the beacon hint for new wiphys or reg changes */
1693  list_add_tail(&pending_beacon->list, &reg_beacon_list);
1694  }
1695 
1696  spin_unlock_bh(&reg_pending_beacons_lock);
1697 out:
1698  mutex_unlock(&cfg80211_mutex);
1699 }
1700 
1701 static void reg_todo(struct work_struct *work)
1702 {
1703  reg_process_pending_hints();
1704  reg_process_pending_beacon_hints();
1705 }
1706 
1707 static void queue_regulatory_request(struct regulatory_request *request)
1708 {
1709  if (isalpha(request->alpha2[0]))
1710  request->alpha2[0] = toupper(request->alpha2[0]);
1711  if (isalpha(request->alpha2[1]))
1712  request->alpha2[1] = toupper(request->alpha2[1]);
1713 
1714  spin_lock(&reg_requests_lock);
1715  list_add_tail(&request->list, &reg_requests_list);
1716  spin_unlock(&reg_requests_lock);
1717 
1718  schedule_work(&reg_work);
1719 }
1720 
1721 /*
1722  * Core regulatory hint -- happens during cfg80211_init()
1723  * and when we restore regulatory settings.
1724  */
1725 static int regulatory_hint_core(const char *alpha2)
1726 {
1727  struct regulatory_request *request;
1728 
1729  request = kzalloc(sizeof(struct regulatory_request),
1730  GFP_KERNEL);
1731  if (!request)
1732  return -ENOMEM;
1733 
1734  request->alpha2[0] = alpha2[0];
1735  request->alpha2[1] = alpha2[1];
1737 
1738  queue_regulatory_request(request);
1739 
1740  return 0;
1741 }
1742 
1743 /* User hints */
1744 int regulatory_hint_user(const char *alpha2,
1746 {
1747  struct regulatory_request *request;
1748 
1749  BUG_ON(!alpha2);
1750 
1751  request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1752  if (!request)
1753  return -ENOMEM;
1754 
1755  request->wiphy_idx = WIPHY_IDX_STALE;
1756  request->alpha2[0] = alpha2[0];
1757  request->alpha2[1] = alpha2[1];
1760 
1761  queue_regulatory_request(request);
1762 
1763  return 0;
1764 }
1765 
1766 /* Driver hints */
1767 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1768 {
1769  struct regulatory_request *request;
1770 
1771  BUG_ON(!alpha2);
1772  BUG_ON(!wiphy);
1773 
1774  request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1775  if (!request)
1776  return -ENOMEM;
1777 
1778  request->wiphy_idx = get_wiphy_idx(wiphy);
1779 
1780  /* Must have registered wiphy first */
1781  BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1782 
1783  request->alpha2[0] = alpha2[0];
1784  request->alpha2[1] = alpha2[1];
1786 
1787  queue_regulatory_request(request);
1788 
1789  return 0;
1790 }
1792 
1793 /*
1794  * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1795  * therefore cannot iterate over the rdev list here.
1796  */
1797 void regulatory_hint_11d(struct wiphy *wiphy,
1798  enum ieee80211_band band,
1799  u8 *country_ie,
1800  u8 country_ie_len)
1801 {
1802  char alpha2[2];
1804  struct regulatory_request *request;
1805 
1807 
1808  if (unlikely(!last_request))
1809  goto out;
1810 
1811  /* IE len must be evenly divisible by 2 */
1812  if (country_ie_len & 0x01)
1813  goto out;
1814 
1815  if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1816  goto out;
1817 
1818  alpha2[0] = country_ie[0];
1819  alpha2[1] = country_ie[1];
1820 
1821  if (country_ie[2] == 'I')
1822  env = ENVIRON_INDOOR;
1823  else if (country_ie[2] == 'O')
1824  env = ENVIRON_OUTDOOR;
1825 
1826  /*
1827  * We will run this only upon a successful connection on cfg80211.
1828  * We leave conflict resolution to the workqueue, where can hold
1829  * cfg80211_mutex.
1830  */
1831  if (likely(last_request->initiator ==
1833  wiphy_idx_valid(last_request->wiphy_idx)))
1834  goto out;
1835 
1836  request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1837  if (!request)
1838  goto out;
1839 
1840  request->wiphy_idx = get_wiphy_idx(wiphy);
1841  request->alpha2[0] = alpha2[0];
1842  request->alpha2[1] = alpha2[1];
1844  request->country_ie_env = env;
1845 
1847 
1848  queue_regulatory_request(request);
1849 
1850  return;
1851 
1852 out:
1854 }
1855 
1856 static void restore_alpha2(char *alpha2, bool reset_user)
1857 {
1858  /* indicates there is no alpha2 to consider for restoration */
1859  alpha2[0] = '9';
1860  alpha2[1] = '7';
1861 
1862  /* The user setting has precedence over the module parameter */
1863  if (is_user_regdom_saved()) {
1864  /* Unless we're asked to ignore it and reset it */
1865  if (reset_user) {
1866  REG_DBG_PRINT("Restoring regulatory settings "
1867  "including user preference\n");
1868  user_alpha2[0] = '9';
1869  user_alpha2[1] = '7';
1870 
1871  /*
1872  * If we're ignoring user settings, we still need to
1873  * check the module parameter to ensure we put things
1874  * back as they were for a full restore.
1875  */
1876  if (!is_world_regdom(ieee80211_regdom)) {
1877  REG_DBG_PRINT("Keeping preference on "
1878  "module parameter ieee80211_regdom: %c%c\n",
1879  ieee80211_regdom[0],
1880  ieee80211_regdom[1]);
1881  alpha2[0] = ieee80211_regdom[0];
1882  alpha2[1] = ieee80211_regdom[1];
1883  }
1884  } else {
1885  REG_DBG_PRINT("Restoring regulatory settings "
1886  "while preserving user preference for: %c%c\n",
1887  user_alpha2[0],
1888  user_alpha2[1]);
1889  alpha2[0] = user_alpha2[0];
1890  alpha2[1] = user_alpha2[1];
1891  }
1892  } else if (!is_world_regdom(ieee80211_regdom)) {
1893  REG_DBG_PRINT("Keeping preference on "
1894  "module parameter ieee80211_regdom: %c%c\n",
1895  ieee80211_regdom[0],
1896  ieee80211_regdom[1]);
1897  alpha2[0] = ieee80211_regdom[0];
1898  alpha2[1] = ieee80211_regdom[1];
1899  } else
1900  REG_DBG_PRINT("Restoring regulatory settings\n");
1901 }
1902 
1903 static void restore_custom_reg_settings(struct wiphy *wiphy)
1904 {
1905  struct ieee80211_supported_band *sband;
1906  enum ieee80211_band band;
1907  struct ieee80211_channel *chan;
1908  int i;
1909 
1910  for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1911  sband = wiphy->bands[band];
1912  if (!sband)
1913  continue;
1914  for (i = 0; i < sband->n_channels; i++) {
1915  chan = &sband->channels[i];
1916  chan->flags = chan->orig_flags;
1917  chan->max_antenna_gain = chan->orig_mag;
1918  chan->max_power = chan->orig_mpwr;
1919  chan->beacon_found = false;
1920  }
1921  }
1922 }
1923 
1924 /*
1925  * Restoring regulatory settings involves ingoring any
1926  * possibly stale country IE information and user regulatory
1927  * settings if so desired, this includes any beacon hints
1928  * learned as we could have traveled outside to another country
1929  * after disconnection. To restore regulatory settings we do
1930  * exactly what we did at bootup:
1931  *
1932  * - send a core regulatory hint
1933  * - send a user regulatory hint if applicable
1934  *
1935  * Device drivers that send a regulatory hint for a specific country
1936  * keep their own regulatory domain on wiphy->regd so that does does
1937  * not need to be remembered.
1938  */
1939 static void restore_regulatory_settings(bool reset_user)
1940 {
1941  char alpha2[2];
1942  char world_alpha2[2];
1943  struct reg_beacon *reg_beacon, *btmp;
1944  struct regulatory_request *reg_request, *tmp;
1945  LIST_HEAD(tmp_reg_req_list);
1947 
1948  mutex_lock(&cfg80211_mutex);
1950 
1951  reset_regdomains(true);
1952  restore_alpha2(alpha2, reset_user);
1953 
1954  /*
1955  * If there's any pending requests we simply
1956  * stash them to a temporary pending queue and
1957  * add then after we've restored regulatory
1958  * settings.
1959  */
1960  spin_lock(&reg_requests_lock);
1961  if (!list_empty(&reg_requests_list)) {
1962  list_for_each_entry_safe(reg_request, tmp,
1963  &reg_requests_list, list) {
1964  if (reg_request->initiator !=
1966  continue;
1967  list_move_tail(&reg_request->list, &tmp_reg_req_list);
1968  }
1969  }
1970  spin_unlock(&reg_requests_lock);
1971 
1972  /* Clear beacon hints */
1973  spin_lock_bh(&reg_pending_beacons_lock);
1974  if (!list_empty(&reg_pending_beacons)) {
1975  list_for_each_entry_safe(reg_beacon, btmp,
1976  &reg_pending_beacons, list) {
1977  list_del(&reg_beacon->list);
1978  kfree(reg_beacon);
1979  }
1980  }
1981  spin_unlock_bh(&reg_pending_beacons_lock);
1982 
1983  if (!list_empty(&reg_beacon_list)) {
1984  list_for_each_entry_safe(reg_beacon, btmp,
1985  &reg_beacon_list, list) {
1986  list_del(&reg_beacon->list);
1987  kfree(reg_beacon);
1988  }
1989  }
1990 
1991  /* First restore to the basic regulatory settings */
1992  cfg80211_regdomain = cfg80211_world_regdom;
1993  world_alpha2[0] = cfg80211_regdomain->alpha2[0];
1994  world_alpha2[1] = cfg80211_regdomain->alpha2[1];
1995 
1996  list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1997  if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1998  restore_custom_reg_settings(&rdev->wiphy);
1999  }
2000 
2002  mutex_unlock(&cfg80211_mutex);
2003 
2004  regulatory_hint_core(world_alpha2);
2005 
2006  /*
2007  * This restores the ieee80211_regdom module parameter
2008  * preference or the last user requested regulatory
2009  * settings, user regulatory settings takes precedence.
2010  */
2011  if (is_an_alpha2(alpha2))
2013 
2014  if (list_empty(&tmp_reg_req_list))
2015  return;
2016 
2017  mutex_lock(&cfg80211_mutex);
2019 
2020  spin_lock(&reg_requests_lock);
2021  list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) {
2022  REG_DBG_PRINT("Adding request for country %c%c back "
2023  "into the queue\n",
2024  reg_request->alpha2[0],
2025  reg_request->alpha2[1]);
2026  list_move_tail(&reg_request->list, &reg_requests_list);
2027  }
2028  spin_unlock(&reg_requests_lock);
2029 
2031  mutex_unlock(&cfg80211_mutex);
2032 
2033  REG_DBG_PRINT("Kicking the queue\n");
2034 
2035  schedule_work(&reg_work);
2036 }
2037 
2039 {
2040  REG_DBG_PRINT("All devices are disconnected, going to "
2041  "restore regulatory settings\n");
2042  restore_regulatory_settings(false);
2043 }
2044 
2045 static bool freq_is_chan_12_13_14(u16 freq)
2046 {
2050  return true;
2051  return false;
2052 }
2053 
2054 int regulatory_hint_found_beacon(struct wiphy *wiphy,
2055  struct ieee80211_channel *beacon_chan,
2056  gfp_t gfp)
2057 {
2058  struct reg_beacon *reg_beacon;
2059 
2060  if (likely((beacon_chan->beacon_found ||
2061  (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
2062  (beacon_chan->band == IEEE80211_BAND_2GHZ &&
2063  !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
2064  return 0;
2065 
2066  reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
2067  if (!reg_beacon)
2068  return -ENOMEM;
2069 
2070  REG_DBG_PRINT("Found new beacon on "
2071  "frequency: %d MHz (Ch %d) on %s\n",
2072  beacon_chan->center_freq,
2074  wiphy_name(wiphy));
2075 
2076  memcpy(&reg_beacon->chan, beacon_chan,
2077  sizeof(struct ieee80211_channel));
2078 
2079 
2080  /*
2081  * Since we can be called from BH or and non-BH context
2082  * we must use spin_lock_bh()
2083  */
2084  spin_lock_bh(&reg_pending_beacons_lock);
2085  list_add_tail(&reg_beacon->list, &reg_pending_beacons);
2086  spin_unlock_bh(&reg_pending_beacons_lock);
2087 
2088  schedule_work(&reg_work);
2089 
2090  return 0;
2091 }
2092 
2093 static void print_rd_rules(const struct ieee80211_regdomain *rd)
2094 {
2095  unsigned int i;
2096  const struct ieee80211_reg_rule *reg_rule = NULL;
2097  const struct ieee80211_freq_range *freq_range = NULL;
2098  const struct ieee80211_power_rule *power_rule = NULL;
2099 
2100  pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
2101 
2102  for (i = 0; i < rd->n_reg_rules; i++) {
2103  reg_rule = &rd->reg_rules[i];
2104  freq_range = &reg_rule->freq_range;
2105  power_rule = &reg_rule->power_rule;
2106 
2107  /*
2108  * There may not be documentation for max antenna gain
2109  * in certain regions
2110  */
2111  if (power_rule->max_antenna_gain)
2112  pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
2113  freq_range->start_freq_khz,
2114  freq_range->end_freq_khz,
2115  freq_range->max_bandwidth_khz,
2116  power_rule->max_antenna_gain,
2117  power_rule->max_eirp);
2118  else
2119  pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
2120  freq_range->start_freq_khz,
2121  freq_range->end_freq_khz,
2122  freq_range->max_bandwidth_khz,
2123  power_rule->max_eirp);
2124  }
2125 }
2126 
2128 {
2129  switch (dfs_region) {
2130  case NL80211_DFS_UNSET:
2131  case NL80211_DFS_FCC:
2132  case NL80211_DFS_ETSI:
2133  case NL80211_DFS_JP:
2134  return true;
2135  default:
2136  REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2137  dfs_region);
2138  return false;
2139  }
2140 }
2141 
2142 static void print_dfs_region(u8 dfs_region)
2143 {
2144  if (!dfs_region)
2145  return;
2146 
2147  switch (dfs_region) {
2148  case NL80211_DFS_FCC:
2149  pr_info(" DFS Master region FCC");
2150  break;
2151  case NL80211_DFS_ETSI:
2152  pr_info(" DFS Master region ETSI");
2153  break;
2154  case NL80211_DFS_JP:
2155  pr_info(" DFS Master region JP");
2156  break;
2157  default:
2158  pr_info(" DFS Master region Uknown");
2159  break;
2160  }
2161 }
2162 
2163 static void print_regdomain(const struct ieee80211_regdomain *rd)
2164 {
2165 
2166  if (is_intersected_alpha2(rd->alpha2)) {
2167 
2168  if (last_request->initiator ==
2172  last_request->wiphy_idx);
2173  if (rdev) {
2174  pr_info("Current regulatory domain updated by AP to: %c%c\n",
2175  rdev->country_ie_alpha2[0],
2176  rdev->country_ie_alpha2[1]);
2177  } else
2178  pr_info("Current regulatory domain intersected:\n");
2179  } else
2180  pr_info("Current regulatory domain intersected:\n");
2181  } else if (is_world_regdom(rd->alpha2))
2182  pr_info("World regulatory domain updated:\n");
2183  else {
2184  if (is_unknown_alpha2(rd->alpha2))
2185  pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
2186  else {
2187  if (reg_request_cell_base(last_request))
2188  pr_info("Regulatory domain changed "
2189  "to country: %c%c by Cell Station\n",
2190  rd->alpha2[0], rd->alpha2[1]);
2191  else
2192  pr_info("Regulatory domain changed "
2193  "to country: %c%c\n",
2194  rd->alpha2[0], rd->alpha2[1]);
2195  }
2196  }
2197  print_dfs_region(rd->dfs_region);
2198  print_rd_rules(rd);
2199 }
2200 
2201 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2202 {
2203  pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
2204  print_rd_rules(rd);
2205 }
2206 
2207 /* Takes ownership of rd only if it doesn't fail */
2208 static int __set_regdom(const struct ieee80211_regdomain *rd)
2209 {
2210  const struct ieee80211_regdomain *intersected_rd = NULL;
2211  struct wiphy *request_wiphy;
2212  /* Some basic sanity checks first */
2213 
2214  if (is_world_regdom(rd->alpha2)) {
2215  if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2216  return -EINVAL;
2217  update_world_regdomain(rd);
2218  return 0;
2219  }
2220 
2221  if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2222  !is_unknown_alpha2(rd->alpha2))
2223  return -EINVAL;
2224 
2225  if (!last_request)
2226  return -EINVAL;
2227 
2228  /*
2229  * Lets only bother proceeding on the same alpha2 if the current
2230  * rd is non static (it means CRDA was present and was used last)
2231  * and the pending request came in from a country IE
2232  */
2233  if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2234  /*
2235  * If someone else asked us to change the rd lets only bother
2236  * checking if the alpha2 changes if CRDA was already called
2237  */
2238  if (!regdom_changes(rd->alpha2))
2239  return -EALREADY;
2240  }
2241 
2242  /*
2243  * Now lets set the regulatory domain, update all driver channels
2244  * and finally inform them of what we have done, in case they want
2245  * to review or adjust their own settings based on their own
2246  * internal EEPROM data
2247  */
2248 
2249  if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2250  return -EINVAL;
2251 
2252  if (!is_valid_rd(rd)) {
2253  pr_err("Invalid regulatory domain detected:\n");
2254  print_regdomain_info(rd);
2255  return -EINVAL;
2256  }
2257 
2258  request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2259  if (!request_wiphy &&
2260  (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2261  last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) {
2262  schedule_delayed_work(&reg_timeout, 0);
2263  return -ENODEV;
2264  }
2265 
2266  if (!last_request->intersect) {
2267  int r;
2268 
2269  if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
2270  reset_regdomains(false);
2271  cfg80211_regdomain = rd;
2272  return 0;
2273  }
2274 
2275  /*
2276  * For a driver hint, lets copy the regulatory domain the
2277  * driver wanted to the wiphy to deal with conflicts
2278  */
2279 
2280  /*
2281  * Userspace could have sent two replies with only
2282  * one kernel request.
2283  */
2284  if (request_wiphy->regd)
2285  return -EALREADY;
2286 
2287  r = reg_copy_regd(&request_wiphy->regd, rd);
2288  if (r)
2289  return r;
2290 
2291  reset_regdomains(false);
2292  cfg80211_regdomain = rd;
2293  return 0;
2294  }
2295 
2296  /* Intersection requires a bit more work */
2297 
2298  if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2299 
2300  intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2301  if (!intersected_rd)
2302  return -EINVAL;
2303 
2304  /*
2305  * We can trash what CRDA provided now.
2306  * However if a driver requested this specific regulatory
2307  * domain we keep it for its private use
2308  */
2309  if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
2310  request_wiphy->regd = rd;
2311  else
2312  kfree(rd);
2313 
2314  rd = NULL;
2315 
2316  reset_regdomains(false);
2317  cfg80211_regdomain = intersected_rd;
2318 
2319  return 0;
2320  }
2321 
2322  return -EINVAL;
2323 }
2324 
2325 
2326 /*
2327  * Use this call to set the current regulatory domain. Conflicts with
2328  * multiple drivers can be ironed out later. Caller must've already
2329  * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2330  */
2331 int set_regdom(const struct ieee80211_regdomain *rd)
2332 {
2333  int r;
2334 
2335  assert_cfg80211_lock();
2336 
2338 
2339  /* Note that this doesn't update the wiphys, this is done below */
2340  r = __set_regdom(rd);
2341  if (r) {
2342  if (r == -EALREADY)
2343  reg_set_request_processed();
2344 
2345  kfree(rd);
2347  return r;
2348  }
2349 
2350  /* This would make this whole thing pointless */
2351  if (!last_request->intersect)
2352  BUG_ON(rd != cfg80211_regdomain);
2353 
2354  /* update all wiphys now with the new established regulatory domain */
2355  update_all_wiphy_regulatory(last_request->initiator);
2356 
2357  print_regdomain(cfg80211_regdomain);
2358 
2359  nl80211_send_reg_change_event(last_request);
2360 
2361  reg_set_request_processed();
2362 
2364 
2365  return r;
2366 }
2367 
2368 #ifdef CONFIG_HOTPLUG
2369 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2370 {
2371  if (last_request && !last_request->processed) {
2372  if (add_uevent_var(env, "COUNTRY=%c%c",
2373  last_request->alpha2[0],
2374  last_request->alpha2[1]))
2375  return -ENOMEM;
2376  }
2377 
2378  return 0;
2379 }
2380 #else
2381 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2382 {
2383  return -ENODEV;
2384 }
2385 #endif /* CONFIG_HOTPLUG */
2386 
2387 void wiphy_regulatory_register(struct wiphy *wiphy)
2388 {
2389  assert_cfg80211_lock();
2390 
2392 
2393  if (!reg_dev_ignore_cell_hint(wiphy))
2394  reg_num_devs_support_basehint++;
2395 
2396  wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
2397 
2399 }
2400 
2401 /* Caller must hold cfg80211_mutex */
2402 void wiphy_regulatory_deregister(struct wiphy *wiphy)
2403 {
2404  struct wiphy *request_wiphy = NULL;
2405 
2406  assert_cfg80211_lock();
2407 
2409 
2410  if (!reg_dev_ignore_cell_hint(wiphy))
2411  reg_num_devs_support_basehint--;
2412 
2413  kfree(wiphy->regd);
2414 
2415  if (last_request)
2416  request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2417 
2418  if (!request_wiphy || request_wiphy != wiphy)
2419  goto out;
2420 
2421  last_request->wiphy_idx = WIPHY_IDX_STALE;
2422  last_request->country_ie_env = ENVIRON_ANY;
2423 out:
2425 }
2426 
2427 static void reg_timeout_work(struct work_struct *work)
2428 {
2429  REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "
2430  "restoring regulatory settings\n");
2431  restore_regulatory_settings(true);
2432 }
2433 
2435 {
2436  int err = 0;
2437 
2438  reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2439  if (IS_ERR(reg_pdev))
2440  return PTR_ERR(reg_pdev);
2441 
2442  reg_pdev->dev.type = &reg_device_type;
2443 
2444  spin_lock_init(&reg_requests_lock);
2445  spin_lock_init(&reg_pending_beacons_lock);
2446 
2447  reg_regdb_size_check();
2448 
2449  cfg80211_regdomain = cfg80211_world_regdom;
2450 
2451  user_alpha2[0] = '9';
2452  user_alpha2[1] = '7';
2453 
2454  /* We always try to get an update for the static regdomain */
2455  err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2456  if (err) {
2457  if (err == -ENOMEM)
2458  return err;
2459  /*
2460  * N.B. kobject_uevent_env() can fail mainly for when we're out
2461  * memory which is handled and propagated appropriately above
2462  * but it can also fail during a netlink_broadcast() or during
2463  * early boot for call_usermodehelper(). For now treat these
2464  * errors as non-fatal.
2465  */
2466  pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2467 #ifdef CONFIG_CFG80211_REG_DEBUG
2468  /* We want to find out exactly why when debugging */
2469  WARN_ON(err);
2470 #endif
2471  }
2472 
2473  /*
2474  * Finally, if the user set the module parameter treat it
2475  * as a user hint.
2476  */
2477  if (!is_world_regdom(ieee80211_regdom))
2478  regulatory_hint_user(ieee80211_regdom,
2480 
2481  return 0;
2482 }
2483 
2484 void /* __init_or_exit */ regulatory_exit(void)
2485 {
2486  struct regulatory_request *reg_request, *tmp;
2487  struct reg_beacon *reg_beacon, *btmp;
2488 
2489  cancel_work_sync(&reg_work);
2490  cancel_delayed_work_sync(&reg_timeout);
2491 
2494 
2495  reset_regdomains(true);
2496 
2497  dev_set_uevent_suppress(&reg_pdev->dev, true);
2498 
2499  platform_device_unregister(reg_pdev);
2500 
2501  spin_lock_bh(&reg_pending_beacons_lock);
2502  if (!list_empty(&reg_pending_beacons)) {
2503  list_for_each_entry_safe(reg_beacon, btmp,
2504  &reg_pending_beacons, list) {
2505  list_del(&reg_beacon->list);
2506  kfree(reg_beacon);
2507  }
2508  }
2509  spin_unlock_bh(&reg_pending_beacons_lock);
2510 
2511  if (!list_empty(&reg_beacon_list)) {
2512  list_for_each_entry_safe(reg_beacon, btmp,
2513  &reg_beacon_list, list) {
2514  list_del(&reg_beacon->list);
2515  kfree(reg_beacon);
2516  }
2517  }
2518 
2519  spin_lock(&reg_requests_lock);
2520  if (!list_empty(&reg_requests_list)) {
2521  list_for_each_entry_safe(reg_request, tmp,
2522  &reg_requests_list, list) {
2523  list_del(&reg_request->list);
2524  kfree(reg_request);
2525  }
2526  }
2527  spin_unlock(&reg_requests_lock);
2528 
2531 }