regulatory: pass new regdomain to reset function
[linux-2.6-block.git] / net / wireless / reg.c
CommitLineData
8318d78a
JB
1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
3b77d5ec 5 * Copyright 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
8318d78a 6 *
3b77d5ec
LR
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.
8318d78a
JB
18 */
19
3b77d5ec 20
b2e1b302
LR
21/**
22 * DOC: Wireless regulatory infrastructure
8318d78a
JB
23 *
24 * The usual implementation is for a driver to read a device EEPROM to
25 * determine which regulatory domain it should be operating under, then
26 * looking up the allowable channels in a driver-local table and finally
27 * registering those channels in the wiphy structure.
28 *
b2e1b302
LR
29 * Another set of compliance enforcement is for drivers to use their
30 * own compliance limits which can be stored on the EEPROM. The host
31 * driver or firmware may ensure these are used.
32 *
33 * In addition to all this we provide an extra layer of regulatory
34 * conformance. For drivers which do not have any regulatory
35 * information CRDA provides the complete regulatory solution.
36 * For others it provides a community effort on further restrictions
37 * to enhance compliance.
38 *
39 * Note: When number of rules --> infinity we will not be able to
40 * index on alpha2 any more, instead we'll probably have to
41 * rely on some SHA1 checksum of the regdomain for example.
42 *
8318d78a 43 */
e9c0268f
JP
44
45#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46
8318d78a 47#include <linux/kernel.h>
bc3b2d7f 48#include <linux/export.h>
5a0e3ad6 49#include <linux/slab.h>
b2e1b302 50#include <linux/list.h>
c61029c7 51#include <linux/ctype.h>
b2e1b302
LR
52#include <linux/nl80211.h>
53#include <linux/platform_device.h>
d9b93842 54#include <linux/moduleparam.h>
b2e1b302 55#include <net/cfg80211.h>
8318d78a 56#include "core.h"
b2e1b302 57#include "reg.h"
3b377ea9 58#include "regdb.h"
73d54c9e 59#include "nl80211.h"
8318d78a 60
4113f751 61#ifdef CONFIG_CFG80211_REG_DEBUG
12c5ffb5
JP
62#define REG_DBG_PRINT(format, args...) \
63 printk(KERN_DEBUG pr_fmt(format), ##args)
4113f751 64#else
8271195e 65#define REG_DBG_PRINT(args...)
4113f751
LR
66#endif
67
2f92212b
JB
68enum reg_request_treatment {
69 REG_REQ_OK,
70 REG_REQ_IGNORE,
71 REG_REQ_INTERSECT,
72 REG_REQ_ALREADY_SET,
73};
74
a042994d
LR
75static struct regulatory_request core_request_world = {
76 .initiator = NL80211_REGDOM_SET_BY_CORE,
77 .alpha2[0] = '0',
78 .alpha2[1] = '0',
79 .intersect = false,
80 .processed = true,
81 .country_ie_env = ENVIRON_ANY,
82};
83
5166ccd2 84/* Receipt of information from last regulatory request */
a042994d 85static struct regulatory_request *last_request = &core_request_world;
734366de 86
b2e1b302
LR
87/* To trigger userspace events */
88static struct platform_device *reg_pdev;
8318d78a 89
4d9d88d1
SJR
90static struct device_type reg_device_type = {
91 .uevent = reg_device_uevent,
92};
93
fb1fc7ad
LR
94/*
95 * Central wireless core regulatory domains, we only need two,
734366de 96 * the current one and a world regulatory domain in case we have no
e8da2bb4
JB
97 * information to give us an alpha2.
98 * Protected by the cfg80211_mutex.
fb1fc7ad 99 */
f130347c 100const struct ieee80211_regdomain *cfg80211_regdomain;
734366de 101
abc7381b
LR
102/*
103 * Protects static reg.c components:
104 * - cfg80211_world_regdom
abc7381b 105 * - last_request
57b5ce07 106 * - reg_num_devs_support_basehint
abc7381b 107 */
670b7f11 108static DEFINE_MUTEX(reg_mutex);
46a5ebaf 109
57b5ce07
LR
110/*
111 * Number of devices that registered to the core
112 * that support cellular base station regulatory hints
113 */
114static int reg_num_devs_support_basehint;
115
46a5ebaf
JB
116static inline void assert_reg_lock(void)
117{
118 lockdep_assert_held(&reg_mutex);
119}
abc7381b 120
e38f8a7a 121/* Used to queue up regulatory hints */
fe33eb39
LR
122static LIST_HEAD(reg_requests_list);
123static spinlock_t reg_requests_lock;
124
e38f8a7a
LR
125/* Used to queue up beacon hints for review */
126static LIST_HEAD(reg_pending_beacons);
127static spinlock_t reg_pending_beacons_lock;
128
129/* Used to keep track of processed beacon hints */
130static LIST_HEAD(reg_beacon_list);
131
132struct reg_beacon {
133 struct list_head list;
134 struct ieee80211_channel chan;
135};
136
f333a7a2
LR
137static void reg_todo(struct work_struct *work);
138static DECLARE_WORK(reg_work, reg_todo);
139
a90c7a31
LR
140static void reg_timeout_work(struct work_struct *work);
141static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
142
734366de
JB
143/* We keep a static world regulatory domain in case of the absence of CRDA */
144static const struct ieee80211_regdomain world_regdom = {
90cdc6df 145 .n_reg_rules = 6,
734366de
JB
146 .alpha2 = "00",
147 .reg_rules = {
68798a62
LR
148 /* IEEE 802.11b/g, channels 1..11 */
149 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
43c771a1
JB
150 /* IEEE 802.11b/g, channels 12..13. */
151 REG_RULE(2467-10, 2472+10, 40, 6, 20,
3fc71f77
LR
152 NL80211_RRF_PASSIVE_SCAN |
153 NL80211_RRF_NO_IBSS),
611b6a82
LR
154 /* IEEE 802.11 channel 14 - Only JP enables
155 * this and for 802.11b only */
156 REG_RULE(2484-10, 2484+10, 20, 6, 20,
157 NL80211_RRF_PASSIVE_SCAN |
158 NL80211_RRF_NO_IBSS |
159 NL80211_RRF_NO_OFDM),
160 /* IEEE 802.11a, channel 36..48 */
ec329ace 161 REG_RULE(5180-10, 5240+10, 40, 6, 20,
611b6a82
LR
162 NL80211_RRF_PASSIVE_SCAN |
163 NL80211_RRF_NO_IBSS),
3fc71f77
LR
164
165 /* NB: 5260 MHz - 5700 MHz requies DFS */
166
167 /* IEEE 802.11a, channel 149..165 */
ec329ace 168 REG_RULE(5745-10, 5825+10, 40, 6, 20,
3fc71f77
LR
169 NL80211_RRF_PASSIVE_SCAN |
170 NL80211_RRF_NO_IBSS),
90cdc6df
VK
171
172 /* IEEE 802.11ad (60gHz), channels 1..3 */
173 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
734366de
JB
174 }
175};
176
a3d2eaf0
JB
177static const struct ieee80211_regdomain *cfg80211_world_regdom =
178 &world_regdom;
734366de 179
6ee7d330 180static char *ieee80211_regdom = "00";
09d989d1 181static char user_alpha2[2];
6ee7d330 182
734366de
JB
183module_param(ieee80211_regdom, charp, 0444);
184MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
185
379b82f4
JB
186static void reset_regdomains(bool full_reset,
187 const struct ieee80211_regdomain *new_regdom)
734366de 188{
e8da2bb4
JB
189 assert_cfg80211_lock();
190 assert_reg_lock();
191
942b25cf
JB
192 /* avoid freeing static information or freeing something twice */
193 if (cfg80211_regdomain == cfg80211_world_regdom)
194 cfg80211_regdomain = NULL;
195 if (cfg80211_world_regdom == &world_regdom)
196 cfg80211_world_regdom = NULL;
197 if (cfg80211_regdomain == &world_regdom)
198 cfg80211_regdomain = NULL;
942b25cf
JB
199
200 kfree(cfg80211_regdomain);
201 kfree(cfg80211_world_regdom);
734366de 202
a3d2eaf0 203 cfg80211_world_regdom = &world_regdom;
379b82f4 204 cfg80211_regdomain = new_regdom;
a042994d
LR
205
206 if (!full_reset)
207 return;
208
209 if (last_request != &core_request_world)
210 kfree(last_request);
211 last_request = &core_request_world;
734366de
JB
212}
213
fb1fc7ad
LR
214/*
215 * Dynamic world regulatory domain requested by the wireless
216 * core upon initialization
217 */
a3d2eaf0 218static void update_world_regdomain(const struct ieee80211_regdomain *rd)
734366de 219{
fdc9d7b2 220 WARN_ON(!last_request);
734366de 221
e8da2bb4
JB
222 assert_cfg80211_lock();
223 assert_reg_lock();
224
379b82f4 225 reset_regdomains(false, rd);
734366de
JB
226
227 cfg80211_world_regdom = rd;
734366de 228}
734366de 229
a3d2eaf0 230bool is_world_regdom(const char *alpha2)
b2e1b302
LR
231{
232 if (!alpha2)
233 return false;
1a919318 234 return alpha2[0] == '0' && alpha2[1] == '0';
b2e1b302 235}
8318d78a 236
a3d2eaf0 237static bool is_alpha2_set(const char *alpha2)
b2e1b302
LR
238{
239 if (!alpha2)
240 return false;
1a919318 241 return alpha2[0] && alpha2[1];
b2e1b302 242}
8318d78a 243
a3d2eaf0 244static bool is_unknown_alpha2(const char *alpha2)
b2e1b302
LR
245{
246 if (!alpha2)
247 return false;
fb1fc7ad
LR
248 /*
249 * Special case where regulatory domain was built by driver
250 * but a specific alpha2 cannot be determined
251 */
1a919318 252 return alpha2[0] == '9' && alpha2[1] == '9';
b2e1b302 253}
8318d78a 254
3f2355cb
LR
255static bool is_intersected_alpha2(const char *alpha2)
256{
257 if (!alpha2)
258 return false;
fb1fc7ad
LR
259 /*
260 * Special case where regulatory domain is the
3f2355cb 261 * result of an intersection between two regulatory domain
fb1fc7ad
LR
262 * structures
263 */
1a919318 264 return alpha2[0] == '9' && alpha2[1] == '8';
3f2355cb
LR
265}
266
a3d2eaf0 267static bool is_an_alpha2(const char *alpha2)
b2e1b302
LR
268{
269 if (!alpha2)
270 return false;
1a919318 271 return isalpha(alpha2[0]) && isalpha(alpha2[1]);
b2e1b302 272}
8318d78a 273
a3d2eaf0 274static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
b2e1b302
LR
275{
276 if (!alpha2_x || !alpha2_y)
277 return false;
1a919318 278 return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
b2e1b302
LR
279}
280
69b1572b 281static bool regdom_changes(const char *alpha2)
b2e1b302 282{
761cf7ec
LR
283 assert_cfg80211_lock();
284
b2e1b302
LR
285 if (!cfg80211_regdomain)
286 return true;
1a919318 287 return !alpha2_equal(cfg80211_regdomain->alpha2, alpha2);
b2e1b302
LR
288}
289
09d989d1
LR
290/*
291 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
292 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
293 * has ever been issued.
294 */
295static bool is_user_regdom_saved(void)
296{
297 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
298 return false;
299
300 /* This would indicate a mistake on the design */
1a919318 301 if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
09d989d1 302 "Unexpected user alpha2: %c%c\n",
1a919318 303 user_alpha2[0], user_alpha2[1]))
09d989d1
LR
304 return false;
305
306 return true;
307}
308
e9763c3c
JB
309static const struct ieee80211_regdomain *
310reg_copy_regd(const struct ieee80211_regdomain *src_regd)
3b377ea9
JL
311{
312 struct ieee80211_regdomain *regd;
e9763c3c 313 int size_of_regd;
3b377ea9
JL
314 unsigned int i;
315
82f20856
JB
316 size_of_regd =
317 sizeof(struct ieee80211_regdomain) +
318 src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
3b377ea9
JL
319
320 regd = kzalloc(size_of_regd, GFP_KERNEL);
321 if (!regd)
e9763c3c 322 return ERR_PTR(-ENOMEM);
3b377ea9
JL
323
324 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
325
326 for (i = 0; i < src_regd->n_reg_rules; i++)
327 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
e9763c3c 328 sizeof(struct ieee80211_reg_rule));
3b377ea9 329
e9763c3c 330 return regd;
3b377ea9
JL
331}
332
333#ifdef CONFIG_CFG80211_INTERNAL_REGDB
334struct reg_regdb_search_request {
335 char alpha2[2];
336 struct list_head list;
337};
338
339static LIST_HEAD(reg_regdb_search_list);
368d06f5 340static DEFINE_MUTEX(reg_regdb_search_mutex);
3b377ea9
JL
341
342static void reg_regdb_search(struct work_struct *work)
343{
344 struct reg_regdb_search_request *request;
e9763c3c
JB
345 const struct ieee80211_regdomain *curdom, *regdom = NULL;
346 int i;
a85d0d7f
LR
347
348 mutex_lock(&cfg80211_mutex);
3b377ea9 349
368d06f5 350 mutex_lock(&reg_regdb_search_mutex);
3b377ea9
JL
351 while (!list_empty(&reg_regdb_search_list)) {
352 request = list_first_entry(&reg_regdb_search_list,
353 struct reg_regdb_search_request,
354 list);
355 list_del(&request->list);
356
1a919318 357 for (i = 0; i < reg_regdb_size; i++) {
3b377ea9
JL
358 curdom = reg_regdb[i];
359
1a919318 360 if (alpha2_equal(request->alpha2, curdom->alpha2)) {
e9763c3c 361 regdom = reg_copy_regd(curdom);
3b377ea9
JL
362 break;
363 }
364 }
365
366 kfree(request);
367 }
368d06f5 368 mutex_unlock(&reg_regdb_search_mutex);
a85d0d7f 369
e9763c3c 370 if (!IS_ERR_OR_NULL(regdom))
a85d0d7f
LR
371 set_regdom(regdom);
372
373 mutex_unlock(&cfg80211_mutex);
3b377ea9
JL
374}
375
376static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
377
378static void reg_regdb_query(const char *alpha2)
379{
380 struct reg_regdb_search_request *request;
381
382 if (!alpha2)
383 return;
384
385 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
386 if (!request)
387 return;
388
389 memcpy(request->alpha2, alpha2, 2);
390
368d06f5 391 mutex_lock(&reg_regdb_search_mutex);
3b377ea9 392 list_add_tail(&request->list, &reg_regdb_search_list);
368d06f5 393 mutex_unlock(&reg_regdb_search_mutex);
3b377ea9
JL
394
395 schedule_work(&reg_regdb_work);
396}
80007efe
LR
397
398/* Feel free to add any other sanity checks here */
399static void reg_regdb_size_check(void)
400{
401 /* We should ideally BUILD_BUG_ON() but then random builds would fail */
402 WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
403}
3b377ea9 404#else
80007efe 405static inline void reg_regdb_size_check(void) {}
3b377ea9
JL
406static inline void reg_regdb_query(const char *alpha2) {}
407#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
408
fb1fc7ad
LR
409/*
410 * This lets us keep regulatory code which is updated on a regulatory
4d9d88d1
SJR
411 * basis in userspace. Country information is filled in by
412 * reg_device_uevent
fb1fc7ad 413 */
b2e1b302
LR
414static int call_crda(const char *alpha2)
415{
b2e1b302 416 if (!is_world_regdom((char *) alpha2))
e9c0268f 417 pr_info("Calling CRDA for country: %c%c\n",
b2e1b302
LR
418 alpha2[0], alpha2[1]);
419 else
e9c0268f 420 pr_info("Calling CRDA to update world regulatory domain\n");
b2e1b302 421
3b377ea9
JL
422 /* query internal regulatory database (if it exists) */
423 reg_regdb_query(alpha2);
424
4d9d88d1 425 return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
b2e1b302
LR
426}
427
6913b49a 428static bool reg_is_valid_request(const char *alpha2)
b2e1b302 429{
6913b49a
JB
430 assert_reg_lock();
431
f6037d09
JB
432 if (!last_request)
433 return false;
434
6913b49a
JB
435 if (last_request->processed)
436 return false;
437
f6037d09 438 return alpha2_equal(last_request->alpha2, alpha2);
b2e1b302 439}
8318d78a 440
b2e1b302 441/* Sanity check on a regulatory rule */
a3d2eaf0 442static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
8318d78a 443{
a3d2eaf0 444 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
b2e1b302
LR
445 u32 freq_diff;
446
91e99004 447 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
b2e1b302
LR
448 return false;
449
450 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
451 return false;
452
453 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
454
bd05f28e 455 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
1a919318 456 freq_range->max_bandwidth_khz > freq_diff)
b2e1b302
LR
457 return false;
458
459 return true;
460}
461
a3d2eaf0 462static bool is_valid_rd(const struct ieee80211_regdomain *rd)
b2e1b302 463{
a3d2eaf0 464 const struct ieee80211_reg_rule *reg_rule = NULL;
b2e1b302 465 unsigned int i;
8318d78a 466
b2e1b302
LR
467 if (!rd->n_reg_rules)
468 return false;
8318d78a 469
88dc1c3f
LR
470 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
471 return false;
472
b2e1b302
LR
473 for (i = 0; i < rd->n_reg_rules; i++) {
474 reg_rule = &rd->reg_rules[i];
475 if (!is_valid_reg_rule(reg_rule))
476 return false;
477 }
478
479 return true;
8318d78a
JB
480}
481
038659e7 482static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
fe7ef5e9 483 u32 center_freq_khz, u32 bw_khz)
b2e1b302 484{
038659e7
LR
485 u32 start_freq_khz, end_freq_khz;
486
487 start_freq_khz = center_freq_khz - (bw_khz/2);
488 end_freq_khz = center_freq_khz + (bw_khz/2);
489
490 if (start_freq_khz >= freq_range->start_freq_khz &&
491 end_freq_khz <= freq_range->end_freq_khz)
492 return true;
493
494 return false;
b2e1b302 495}
8318d78a 496
0c7dc45d
LR
497/**
498 * freq_in_rule_band - tells us if a frequency is in a frequency band
499 * @freq_range: frequency rule we want to query
500 * @freq_khz: frequency we are inquiring about
501 *
502 * This lets us know if a specific frequency rule is or is not relevant to
503 * a specific frequency's band. Bands are device specific and artificial
64629b9d
VK
504 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
505 * however it is safe for now to assume that a frequency rule should not be
506 * part of a frequency's band if the start freq or end freq are off by more
507 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
508 * 60 GHz band.
0c7dc45d
LR
509 * This resolution can be lowered and should be considered as we add
510 * regulatory rule support for other "bands".
511 **/
512static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
1a919318 513 u32 freq_khz)
0c7dc45d
LR
514{
515#define ONE_GHZ_IN_KHZ 1000000
64629b9d
VK
516 /*
517 * From 802.11ad: directional multi-gigabit (DMG):
518 * Pertaining to operation in a frequency band containing a channel
519 * with the Channel starting frequency above 45 GHz.
520 */
521 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
522 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
523 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
0c7dc45d 524 return true;
64629b9d 525 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
0c7dc45d
LR
526 return true;
527 return false;
528#undef ONE_GHZ_IN_KHZ
529}
530
fb1fc7ad
LR
531/*
532 * Helper for regdom_intersect(), this does the real
533 * mathematical intersection fun
534 */
1a919318
JB
535static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,
536 const struct ieee80211_reg_rule *rule2,
537 struct ieee80211_reg_rule *intersected_rule)
9c96477d
LR
538{
539 const struct ieee80211_freq_range *freq_range1, *freq_range2;
540 struct ieee80211_freq_range *freq_range;
541 const struct ieee80211_power_rule *power_rule1, *power_rule2;
542 struct ieee80211_power_rule *power_rule;
543 u32 freq_diff;
544
545 freq_range1 = &rule1->freq_range;
546 freq_range2 = &rule2->freq_range;
547 freq_range = &intersected_rule->freq_range;
548
549 power_rule1 = &rule1->power_rule;
550 power_rule2 = &rule2->power_rule;
551 power_rule = &intersected_rule->power_rule;
552
553 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
1a919318 554 freq_range2->start_freq_khz);
9c96477d 555 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
1a919318 556 freq_range2->end_freq_khz);
9c96477d 557 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
1a919318 558 freq_range2->max_bandwidth_khz);
9c96477d
LR
559
560 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
561 if (freq_range->max_bandwidth_khz > freq_diff)
562 freq_range->max_bandwidth_khz = freq_diff;
563
564 power_rule->max_eirp = min(power_rule1->max_eirp,
565 power_rule2->max_eirp);
566 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
567 power_rule2->max_antenna_gain);
568
1a919318 569 intersected_rule->flags = rule1->flags | rule2->flags;
9c96477d
LR
570
571 if (!is_valid_reg_rule(intersected_rule))
572 return -EINVAL;
573
574 return 0;
575}
576
577/**
578 * regdom_intersect - do the intersection between two regulatory domains
579 * @rd1: first regulatory domain
580 * @rd2: second regulatory domain
581 *
582 * Use this function to get the intersection between two regulatory domains.
583 * Once completed we will mark the alpha2 for the rd as intersected, "98",
584 * as no one single alpha2 can represent this regulatory domain.
585 *
586 * Returns a pointer to the regulatory domain structure which will hold the
587 * resulting intersection of rules between rd1 and rd2. We will
588 * kzalloc() this structure for you.
589 */
1a919318
JB
590static struct ieee80211_regdomain *
591regdom_intersect(const struct ieee80211_regdomain *rd1,
592 const struct ieee80211_regdomain *rd2)
9c96477d
LR
593{
594 int r, size_of_regd;
595 unsigned int x, y;
596 unsigned int num_rules = 0, rule_idx = 0;
597 const struct ieee80211_reg_rule *rule1, *rule2;
598 struct ieee80211_reg_rule *intersected_rule;
599 struct ieee80211_regdomain *rd;
600 /* This is just a dummy holder to help us count */
74f53cd8 601 struct ieee80211_reg_rule dummy_rule;
9c96477d
LR
602
603 if (!rd1 || !rd2)
604 return NULL;
605
fb1fc7ad
LR
606 /*
607 * First we get a count of the rules we'll need, then we actually
9c96477d
LR
608 * build them. This is to so we can malloc() and free() a
609 * regdomain once. The reason we use reg_rules_intersect() here
610 * is it will return -EINVAL if the rule computed makes no sense.
fb1fc7ad
LR
611 * All rules that do check out OK are valid.
612 */
9c96477d
LR
613
614 for (x = 0; x < rd1->n_reg_rules; x++) {
615 rule1 = &rd1->reg_rules[x];
616 for (y = 0; y < rd2->n_reg_rules; y++) {
617 rule2 = &rd2->reg_rules[y];
74f53cd8 618 if (!reg_rules_intersect(rule1, rule2, &dummy_rule))
9c96477d 619 num_rules++;
9c96477d
LR
620 }
621 }
622
623 if (!num_rules)
624 return NULL;
625
626 size_of_regd = sizeof(struct ieee80211_regdomain) +
82f20856 627 num_rules * sizeof(struct ieee80211_reg_rule);
9c96477d
LR
628
629 rd = kzalloc(size_of_regd, GFP_KERNEL);
630 if (!rd)
631 return NULL;
632
8a57fff0 633 for (x = 0; x < rd1->n_reg_rules && rule_idx < num_rules; x++) {
9c96477d 634 rule1 = &rd1->reg_rules[x];
8a57fff0 635 for (y = 0; y < rd2->n_reg_rules && rule_idx < num_rules; y++) {
9c96477d 636 rule2 = &rd2->reg_rules[y];
fb1fc7ad
LR
637 /*
638 * This time around instead of using the stack lets
9c96477d 639 * write to the target rule directly saving ourselves
fb1fc7ad
LR
640 * a memcpy()
641 */
9c96477d 642 intersected_rule = &rd->reg_rules[rule_idx];
1a919318 643 r = reg_rules_intersect(rule1, rule2, intersected_rule);
fb1fc7ad
LR
644 /*
645 * No need to memset here the intersected rule here as
646 * we're not using the stack anymore
647 */
9c96477d
LR
648 if (r)
649 continue;
650 rule_idx++;
651 }
652 }
653
654 if (rule_idx != num_rules) {
655 kfree(rd);
656 return NULL;
657 }
658
659 rd->n_reg_rules = num_rules;
660 rd->alpha2[0] = '9';
661 rd->alpha2[1] = '8';
662
663 return rd;
664}
665
fb1fc7ad
LR
666/*
667 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
668 * want to just have the channel structure use these
669 */
b2e1b302
LR
670static u32 map_regdom_flags(u32 rd_flags)
671{
672 u32 channel_flags = 0;
673 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
674 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
675 if (rd_flags & NL80211_RRF_NO_IBSS)
676 channel_flags |= IEEE80211_CHAN_NO_IBSS;
677 if (rd_flags & NL80211_RRF_DFS)
678 channel_flags |= IEEE80211_CHAN_RADAR;
03f6b084
SF
679 if (rd_flags & NL80211_RRF_NO_OFDM)
680 channel_flags |= IEEE80211_CHAN_NO_OFDM;
b2e1b302
LR
681 return channel_flags;
682}
683
fe7ef5e9 684static int freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq,
1fa25e41 685 const struct ieee80211_reg_rule **reg_rule,
5d885b99 686 const struct ieee80211_regdomain *regd)
8318d78a
JB
687{
688 int i;
0c7dc45d 689 bool band_rule_found = false;
038659e7
LR
690 bool bw_fits = false;
691
3e0c3ff3 692 if (!regd)
b2e1b302
LR
693 return -EINVAL;
694
3e0c3ff3 695 for (i = 0; i < regd->n_reg_rules; i++) {
b2e1b302
LR
696 const struct ieee80211_reg_rule *rr;
697 const struct ieee80211_freq_range *fr = NULL;
b2e1b302 698
3e0c3ff3 699 rr = &regd->reg_rules[i];
b2e1b302 700 fr = &rr->freq_range;
0c7dc45d 701
fb1fc7ad
LR
702 /*
703 * We only need to know if one frequency rule was
0c7dc45d 704 * was in center_freq's band, that's enough, so lets
fb1fc7ad
LR
705 * not overwrite it once found
706 */
0c7dc45d
LR
707 if (!band_rule_found)
708 band_rule_found = freq_in_rule_band(fr, center_freq);
709
fe7ef5e9 710 bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20));
0c7dc45d 711
038659e7 712 if (band_rule_found && bw_fits) {
b2e1b302 713 *reg_rule = rr;
038659e7 714 return 0;
8318d78a
JB
715 }
716 }
717
0c7dc45d
LR
718 if (!band_rule_found)
719 return -ERANGE;
720
038659e7 721 return -EINVAL;
b2e1b302
LR
722}
723
fe7ef5e9 724int freq_reg_info(struct wiphy *wiphy, u32 center_freq,
038659e7 725 const struct ieee80211_reg_rule **reg_rule)
1fa25e41 726{
5d885b99
JB
727 const struct ieee80211_regdomain *regd;
728
729 assert_reg_lock();
ac46d48e 730 assert_cfg80211_lock();
1a919318 731
5d885b99
JB
732 /*
733 * Follow the driver's regulatory domain, if present, unless a country
734 * IE has been processed or a user wants to help complaince further
735 */
736 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
737 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
738 wiphy->regd)
739 regd = wiphy->regd;
740 else
741 regd = cfg80211_regdomain;
742
fe7ef5e9 743 return freq_reg_info_regd(wiphy, center_freq, reg_rule, regd);
1fa25e41 744}
4f366c5d 745EXPORT_SYMBOL(freq_reg_info);
b2e1b302 746
926a0a09
LR
747#ifdef CONFIG_CFG80211_REG_DEBUG
748static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
749{
750 switch (initiator) {
751 case NL80211_REGDOM_SET_BY_CORE:
752 return "Set by core";
753 case NL80211_REGDOM_SET_BY_USER:
754 return "Set by user";
755 case NL80211_REGDOM_SET_BY_DRIVER:
756 return "Set by driver";
757 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
758 return "Set by country IE";
759 default:
760 WARN_ON(1);
761 return "Set by bug";
762 }
763}
e702d3cf
LR
764
765static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
e702d3cf
LR
766 const struct ieee80211_reg_rule *reg_rule)
767{
768 const struct ieee80211_power_rule *power_rule;
769 const struct ieee80211_freq_range *freq_range;
770 char max_antenna_gain[32];
771
772 power_rule = &reg_rule->power_rule;
773 freq_range = &reg_rule->freq_range;
774
775 if (!power_rule->max_antenna_gain)
776 snprintf(max_antenna_gain, 32, "N/A");
777 else
778 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
779
fe7ef5e9
JB
780 REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
781 chan->center_freq);
e702d3cf 782
56e6786e 783 REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
1a919318
JB
784 freq_range->start_freq_khz, freq_range->end_freq_khz,
785 freq_range->max_bandwidth_khz, max_antenna_gain,
e702d3cf
LR
786 power_rule->max_eirp);
787}
788#else
789static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
e702d3cf
LR
790 const struct ieee80211_reg_rule *reg_rule)
791{
792 return;
793}
926a0a09
LR
794#endif
795
038659e7
LR
796/*
797 * Note that right now we assume the desired channel bandwidth
798 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
fe7ef5e9 799 * per channel, the primary and the extension channel).
038659e7 800 */
7ca43d03
LR
801static void handle_channel(struct wiphy *wiphy,
802 enum nl80211_reg_initiator initiator,
fdc9d7b2 803 struct ieee80211_channel *chan)
b2e1b302
LR
804{
805 int r;
038659e7 806 u32 flags, bw_flags = 0;
b2e1b302
LR
807 const struct ieee80211_reg_rule *reg_rule = NULL;
808 const struct ieee80211_power_rule *power_rule = NULL;
038659e7 809 const struct ieee80211_freq_range *freq_range = NULL;
fe33eb39 810 struct wiphy *request_wiphy = NULL;
a92a3ce7 811
761cf7ec
LR
812 assert_cfg80211_lock();
813
806a9e39
LR
814 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
815
a92a3ce7 816 flags = chan->orig_flags;
b2e1b302 817
fe7ef5e9 818 r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq), &reg_rule);
ca4ffe8f
LR
819 if (r) {
820 /*
821 * We will disable all channels that do not match our
25985edc 822 * received regulatory rule unless the hint is coming
ca4ffe8f
LR
823 * from a Country IE and the Country IE had no information
824 * about a band. The IEEE 802.11 spec allows for an AP
825 * to send only a subset of the regulatory rules allowed,
826 * so an AP in the US that only supports 2.4 GHz may only send
827 * a country IE with information for the 2.4 GHz band
828 * while 5 GHz is still supported.
829 */
830 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
831 r == -ERANGE)
832 return;
833
d91e41b6 834 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
ca4ffe8f 835 chan->flags = IEEE80211_CHAN_DISABLED;
8318d78a 836 return;
ca4ffe8f 837 }
8318d78a 838
fe7ef5e9 839 chan_reg_rule_print_dbg(chan, reg_rule);
e702d3cf 840
b2e1b302 841 power_rule = &reg_rule->power_rule;
038659e7
LR
842 freq_range = &reg_rule->freq_range;
843
844 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
845 bw_flags = IEEE80211_CHAN_NO_HT40;
b2e1b302 846
7db90f4a 847 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
806a9e39 848 request_wiphy && request_wiphy == wiphy &&
5be83de5 849 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
fb1fc7ad 850 /*
25985edc 851 * This guarantees the driver's requested regulatory domain
f976376d 852 * will always be used as a base for further regulatory
fb1fc7ad
LR
853 * settings
854 */
f976376d 855 chan->flags = chan->orig_flags =
038659e7 856 map_regdom_flags(reg_rule->flags) | bw_flags;
f976376d
LR
857 chan->max_antenna_gain = chan->orig_mag =
858 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
279f0f55 859 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
f976376d
LR
860 (int) MBM_TO_DBM(power_rule->max_eirp);
861 return;
862 }
863
aa3d7eef 864 chan->beacon_found = false;
038659e7 865 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1a919318
JB
866 chan->max_antenna_gain =
867 min_t(int, chan->orig_mag,
868 MBI_TO_DBI(power_rule->max_antenna_gain));
eccc068e 869 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
5e31fc08
SG
870 if (chan->orig_mpwr) {
871 /*
872 * Devices that have their own custom regulatory domain
873 * but also use WIPHY_FLAG_STRICT_REGULATORY will follow the
874 * passed country IE power settings.
875 */
876 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
877 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
878 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
879 chan->max_power = chan->max_reg_power;
880 else
881 chan->max_power = min(chan->orig_mpwr,
882 chan->max_reg_power);
883 } else
884 chan->max_power = chan->max_reg_power;
8318d78a
JB
885}
886
fdc9d7b2
JB
887static void handle_band(struct wiphy *wiphy,
888 enum nl80211_reg_initiator initiator,
889 struct ieee80211_supported_band *sband)
8318d78a 890{
a92a3ce7 891 unsigned int i;
a92a3ce7 892
fdc9d7b2
JB
893 if (!sband)
894 return;
8318d78a
JB
895
896 for (i = 0; i < sband->n_channels; i++)
fdc9d7b2 897 handle_channel(wiphy, initiator, &sband->channels[i]);
8318d78a
JB
898}
899
57b5ce07
LR
900static bool reg_request_cell_base(struct regulatory_request *request)
901{
902 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
903 return false;
1a919318 904 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
57b5ce07
LR
905}
906
907bool reg_last_request_cell_base(void)
908{
ebd0fd2b 909 bool val;
1a919318 910
57b5ce07 911 mutex_lock(&reg_mutex);
ebd0fd2b 912 val = reg_request_cell_base(last_request);
57b5ce07 913 mutex_unlock(&reg_mutex);
1a919318 914
ebd0fd2b 915 return val;
57b5ce07
LR
916}
917
918#ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
57b5ce07 919/* Core specific check */
2f92212b
JB
920static enum reg_request_treatment
921reg_ignore_cell_hint(struct regulatory_request *pending_request)
57b5ce07
LR
922{
923 if (!reg_num_devs_support_basehint)
2f92212b 924 return REG_REQ_IGNORE;
57b5ce07 925
1a919318
JB
926 if (reg_request_cell_base(last_request) &&
927 !regdom_changes(pending_request->alpha2))
2f92212b 928 return REG_REQ_ALREADY_SET;
1a919318 929
2f92212b 930 return REG_REQ_OK;
57b5ce07
LR
931}
932
933/* Device specific check */
934static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
935{
1a919318 936 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
57b5ce07
LR
937}
938#else
939static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
940{
2f92212b 941 return REG_REQ_IGNORE;
57b5ce07 942}
1a919318
JB
943
944static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
57b5ce07
LR
945{
946 return true;
947}
948#endif
949
950
7db90f4a
LR
951static bool ignore_reg_update(struct wiphy *wiphy,
952 enum nl80211_reg_initiator initiator)
14b9815a 953{
926a0a09 954 if (!last_request) {
1a919318 955 REG_DBG_PRINT("Ignoring regulatory request %s since last_request is not set\n",
926a0a09 956 reg_initiator_name(initiator));
14b9815a 957 return true;
926a0a09
LR
958 }
959
7db90f4a 960 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
926a0a09 961 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
1a919318 962 REG_DBG_PRINT("Ignoring regulatory request %s since the driver uses its own custom regulatory domain\n",
926a0a09 963 reg_initiator_name(initiator));
14b9815a 964 return true;
926a0a09
LR
965 }
966
fb1fc7ad
LR
967 /*
968 * wiphy->regd will be set once the device has its own
969 * desired regulatory domain set
970 */
5be83de5 971 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
749b527b 972 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
926a0a09 973 !is_world_regdom(last_request->alpha2)) {
1a919318 974 REG_DBG_PRINT("Ignoring regulatory request %s since the driver requires its own regulatory domain to be set first\n",
926a0a09 975 reg_initiator_name(initiator));
14b9815a 976 return true;
926a0a09
LR
977 }
978
57b5ce07
LR
979 if (reg_request_cell_base(last_request))
980 return reg_dev_ignore_cell_hint(wiphy);
981
14b9815a
LR
982 return false;
983}
984
1a919318 985static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
e38f8a7a
LR
986 struct reg_beacon *reg_beacon)
987{
e38f8a7a
LR
988 struct ieee80211_supported_band *sband;
989 struct ieee80211_channel *chan;
6bad8766
LR
990 bool channel_changed = false;
991 struct ieee80211_channel chan_before;
e38f8a7a 992
e38f8a7a
LR
993 sband = wiphy->bands[reg_beacon->chan.band];
994 chan = &sband->channels[chan_idx];
995
996 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
997 return;
998
6bad8766
LR
999 if (chan->beacon_found)
1000 return;
1001
1002 chan->beacon_found = true;
1003
5be83de5 1004 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
37184244
LR
1005 return;
1006
6bad8766
LR
1007 chan_before.center_freq = chan->center_freq;
1008 chan_before.flags = chan->flags;
1009
37184244 1010 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
e38f8a7a 1011 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
6bad8766 1012 channel_changed = true;
e38f8a7a
LR
1013 }
1014
37184244 1015 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
e38f8a7a 1016 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
6bad8766 1017 channel_changed = true;
e38f8a7a
LR
1018 }
1019
6bad8766
LR
1020 if (channel_changed)
1021 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
e38f8a7a
LR
1022}
1023
1024/*
1025 * Called when a scan on a wiphy finds a beacon on
1026 * new channel
1027 */
1028static void wiphy_update_new_beacon(struct wiphy *wiphy,
1029 struct reg_beacon *reg_beacon)
1030{
1031 unsigned int i;
1032 struct ieee80211_supported_band *sband;
1033
e38f8a7a
LR
1034 if (!wiphy->bands[reg_beacon->chan.band])
1035 return;
1036
1037 sband = wiphy->bands[reg_beacon->chan.band];
1038
1039 for (i = 0; i < sband->n_channels; i++)
1040 handle_reg_beacon(wiphy, i, reg_beacon);
1041}
1042
1043/*
1044 * Called upon reg changes or a new wiphy is added
1045 */
1046static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1047{
1048 unsigned int i;
1049 struct ieee80211_supported_band *sband;
1050 struct reg_beacon *reg_beacon;
1051
e38f8a7a
LR
1052 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1053 if (!wiphy->bands[reg_beacon->chan.band])
1054 continue;
1055 sband = wiphy->bands[reg_beacon->chan.band];
1056 for (i = 0; i < sband->n_channels; i++)
1057 handle_reg_beacon(wiphy, i, reg_beacon);
1058 }
1059}
1060
1061static bool reg_is_world_roaming(struct wiphy *wiphy)
1062{
e8da2bb4
JB
1063 assert_cfg80211_lock();
1064
e38f8a7a
LR
1065 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1066 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1067 return true;
b1ed8ddd
LR
1068 if (last_request &&
1069 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
5be83de5 1070 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
e38f8a7a
LR
1071 return true;
1072 return false;
1073}
1074
1075/* Reap the advantages of previously found beacons */
1076static void reg_process_beacons(struct wiphy *wiphy)
1077{
b1ed8ddd
LR
1078 /*
1079 * Means we are just firing up cfg80211, so no beacons would
1080 * have been processed yet.
1081 */
1082 if (!last_request)
1083 return;
e38f8a7a
LR
1084 if (!reg_is_world_roaming(wiphy))
1085 return;
1086 wiphy_update_beacon_reg(wiphy);
1087}
1088
1a919318 1089static bool is_ht40_allowed(struct ieee80211_channel *chan)
038659e7
LR
1090{
1091 if (!chan)
1a919318 1092 return false;
038659e7 1093 if (chan->flags & IEEE80211_CHAN_DISABLED)
1a919318 1094 return false;
038659e7 1095 /* This would happen when regulatory rules disallow HT40 completely */
1a919318 1096 return !(chan->flags & IEEE80211_CHAN_NO_HT40);
038659e7
LR
1097}
1098
1099static void reg_process_ht_flags_channel(struct wiphy *wiphy,
fdc9d7b2 1100 struct ieee80211_channel *channel)
038659e7 1101{
fdc9d7b2 1102 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
038659e7
LR
1103 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1104 unsigned int i;
1105
1a919318 1106 if (!is_ht40_allowed(channel)) {
038659e7
LR
1107 channel->flags |= IEEE80211_CHAN_NO_HT40;
1108 return;
1109 }
1110
1111 /*
1112 * We need to ensure the extension channels exist to
1113 * be able to use HT40- or HT40+, this finds them (or not)
1114 */
1115 for (i = 0; i < sband->n_channels; i++) {
1116 struct ieee80211_channel *c = &sband->channels[i];
1a919318 1117
038659e7
LR
1118 if (c->center_freq == (channel->center_freq - 20))
1119 channel_before = c;
1120 if (c->center_freq == (channel->center_freq + 20))
1121 channel_after = c;
1122 }
1123
1124 /*
1125 * Please note that this assumes target bandwidth is 20 MHz,
1126 * if that ever changes we also need to change the below logic
1127 * to include that as well.
1128 */
1a919318 1129 if (!is_ht40_allowed(channel_before))
689da1b3 1130 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
038659e7 1131 else
689da1b3 1132 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
038659e7 1133
1a919318 1134 if (!is_ht40_allowed(channel_after))
689da1b3 1135 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
038659e7 1136 else
689da1b3 1137 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
038659e7
LR
1138}
1139
1140static void reg_process_ht_flags_band(struct wiphy *wiphy,
fdc9d7b2 1141 struct ieee80211_supported_band *sband)
038659e7
LR
1142{
1143 unsigned int i;
038659e7 1144
fdc9d7b2
JB
1145 if (!sband)
1146 return;
038659e7
LR
1147
1148 for (i = 0; i < sband->n_channels; i++)
fdc9d7b2 1149 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
038659e7
LR
1150}
1151
1152static void reg_process_ht_flags(struct wiphy *wiphy)
1153{
1154 enum ieee80211_band band;
1155
1156 if (!wiphy)
1157 return;
1158
fdc9d7b2
JB
1159 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1160 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
038659e7
LR
1161}
1162
eac03e38
SN
1163static void wiphy_update_regulatory(struct wiphy *wiphy,
1164 enum nl80211_reg_initiator initiator)
b2e1b302
LR
1165{
1166 enum ieee80211_band band;
d46e5b1d 1167
e8da2bb4 1168 assert_cfg80211_lock();
eac03e38
SN
1169 assert_reg_lock();
1170
7db90f4a 1171 if (ignore_reg_update(wiphy, initiator))
a203c2aa
SN
1172 return;
1173
b68e6b3b
LR
1174 last_request->dfs_region = cfg80211_regdomain->dfs_region;
1175
fdc9d7b2
JB
1176 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1177 handle_band(wiphy, initiator, wiphy->bands[band]);
a203c2aa 1178
e38f8a7a 1179 reg_process_beacons(wiphy);
038659e7 1180 reg_process_ht_flags(wiphy);
1a919318 1181
560e28e1 1182 if (wiphy->reg_notifier)
716f9392 1183 wiphy->reg_notifier(wiphy, last_request);
b2e1b302
LR
1184}
1185
d7549cbb
SN
1186static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1187{
1188 struct cfg80211_registered_device *rdev;
4a38994f 1189 struct wiphy *wiphy;
d7549cbb 1190
4a38994f
RM
1191 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1192 wiphy = &rdev->wiphy;
1193 wiphy_update_regulatory(wiphy, initiator);
1194 /*
1195 * Regulatory updates set by CORE are ignored for custom
1196 * regulatory cards. Let us notify the changes to the driver,
1197 * as some drivers used this to restore its orig_* reg domain.
1198 */
1199 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1200 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
1201 wiphy->reg_notifier)
1202 wiphy->reg_notifier(wiphy, last_request);
1203 }
d7549cbb
SN
1204}
1205
1fa25e41 1206static void handle_channel_custom(struct wiphy *wiphy,
fdc9d7b2 1207 struct ieee80211_channel *chan,
1fa25e41
LR
1208 const struct ieee80211_regdomain *regd)
1209{
1210 int r;
038659e7 1211 u32 bw_flags = 0;
1fa25e41
LR
1212 const struct ieee80211_reg_rule *reg_rule = NULL;
1213 const struct ieee80211_power_rule *power_rule = NULL;
038659e7 1214 const struct ieee80211_freq_range *freq_range = NULL;
1fa25e41 1215
1a919318 1216 r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
fe7ef5e9 1217 &reg_rule, regd);
1fa25e41
LR
1218
1219 if (r) {
fe7ef5e9
JB
1220 REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1221 chan->center_freq);
1fa25e41
LR
1222 chan->flags = IEEE80211_CHAN_DISABLED;
1223 return;
1224 }
1225
fe7ef5e9 1226 chan_reg_rule_print_dbg(chan, reg_rule);
e702d3cf 1227
1fa25e41 1228 power_rule = &reg_rule->power_rule;
038659e7
LR
1229 freq_range = &reg_rule->freq_range;
1230
1231 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1232 bw_flags = IEEE80211_CHAN_NO_HT40;
1fa25e41 1233
038659e7 1234 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1fa25e41 1235 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
279f0f55
FF
1236 chan->max_reg_power = chan->max_power =
1237 (int) MBM_TO_DBM(power_rule->max_eirp);
1fa25e41
LR
1238}
1239
fdc9d7b2
JB
1240static void handle_band_custom(struct wiphy *wiphy,
1241 struct ieee80211_supported_band *sband,
1fa25e41
LR
1242 const struct ieee80211_regdomain *regd)
1243{
1244 unsigned int i;
1fa25e41 1245
fdc9d7b2
JB
1246 if (!sband)
1247 return;
1fa25e41
LR
1248
1249 for (i = 0; i < sband->n_channels; i++)
fdc9d7b2 1250 handle_channel_custom(wiphy, &sband->channels[i], regd);
1fa25e41
LR
1251}
1252
1253/* Used by drivers prior to wiphy registration */
1254void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1255 const struct ieee80211_regdomain *regd)
1256{
1257 enum ieee80211_band band;
bbcf3f02 1258 unsigned int bands_set = 0;
ac46d48e 1259
1fa25e41 1260 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
bbcf3f02
LR
1261 if (!wiphy->bands[band])
1262 continue;
fdc9d7b2 1263 handle_band_custom(wiphy, wiphy->bands[band], regd);
bbcf3f02 1264 bands_set++;
b2e1b302 1265 }
bbcf3f02
LR
1266
1267 /*
1268 * no point in calling this if it won't have any effect
1a919318 1269 * on your device's supported bands.
bbcf3f02
LR
1270 */
1271 WARN_ON(!bands_set);
b2e1b302 1272}
1fa25e41
LR
1273EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1274
84fa4f43
JB
1275/* This has the logic which determines when a new request
1276 * should be ignored. */
2f92212b
JB
1277static enum reg_request_treatment
1278get_reg_request_treatment(struct wiphy *wiphy,
2f92cd2e 1279 struct regulatory_request *pending_request)
84fa4f43 1280{
806a9e39 1281 struct wiphy *last_wiphy = NULL;
761cf7ec 1282
84fa4f43
JB
1283 /* All initial requests are respected */
1284 if (!last_request)
2f92212b 1285 return REG_REQ_OK;
84fa4f43 1286
2f92cd2e 1287 switch (pending_request->initiator) {
7db90f4a 1288 case NL80211_REGDOM_SET_BY_CORE:
2f92212b 1289 return REG_REQ_OK;
7db90f4a 1290 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
57b5ce07
LR
1291 if (reg_request_cell_base(last_request)) {
1292 /* Trust a Cell base station over the AP's country IE */
1293 if (regdom_changes(pending_request->alpha2))
2f92212b
JB
1294 return REG_REQ_IGNORE;
1295 return REG_REQ_ALREADY_SET;
57b5ce07
LR
1296 }
1297
806a9e39
LR
1298 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1299
2f92cd2e 1300 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
84fa4f43 1301 return -EINVAL;
7db90f4a
LR
1302 if (last_request->initiator ==
1303 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
806a9e39 1304 if (last_wiphy != wiphy) {
84fa4f43
JB
1305 /*
1306 * Two cards with two APs claiming different
1fe90b03 1307 * Country IE alpha2s. We could
84fa4f43
JB
1308 * intersect them, but that seems unlikely
1309 * to be correct. Reject second one for now.
1310 */
2f92cd2e 1311 if (regdom_changes(pending_request->alpha2))
2f92212b
JB
1312 return REG_REQ_IGNORE;
1313 return REG_REQ_ALREADY_SET;
84fa4f43 1314 }
fb1fc7ad
LR
1315 /*
1316 * Two consecutive Country IE hints on the same wiphy.
1317 * This should be picked up early by the driver/stack
1318 */
2f92cd2e 1319 if (WARN_ON(regdom_changes(pending_request->alpha2)))
2f92212b
JB
1320 return REG_REQ_OK;
1321 return REG_REQ_ALREADY_SET;
84fa4f43 1322 }
a171fba4 1323 return 0;
7db90f4a
LR
1324 case NL80211_REGDOM_SET_BY_DRIVER:
1325 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
2f92cd2e 1326 if (regdom_changes(pending_request->alpha2))
2f92212b
JB
1327 return REG_REQ_OK;
1328 return REG_REQ_ALREADY_SET;
e74b1e7f 1329 }
fff32c04
LR
1330
1331 /*
1332 * This would happen if you unplug and plug your card
1333 * back in or if you add a new device for which the previously
1334 * loaded card also agrees on the regulatory domain.
1335 */
7db90f4a 1336 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
2f92cd2e 1337 !regdom_changes(pending_request->alpha2))
2f92212b 1338 return REG_REQ_ALREADY_SET;
fff32c04 1339
2f92212b 1340 return REG_REQ_INTERSECT;
7db90f4a 1341 case NL80211_REGDOM_SET_BY_USER:
57b5ce07
LR
1342 if (reg_request_cell_base(pending_request))
1343 return reg_ignore_cell_hint(pending_request);
1344
1345 if (reg_request_cell_base(last_request))
2f92212b 1346 return REG_REQ_IGNORE;
57b5ce07 1347
7db90f4a 1348 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
2f92212b 1349 return REG_REQ_INTERSECT;
fb1fc7ad
LR
1350 /*
1351 * If the user knows better the user should set the regdom
1352 * to their country before the IE is picked up
1353 */
7db90f4a 1354 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1a919318 1355 last_request->intersect)
2f92212b 1356 return REG_REQ_IGNORE;
fb1fc7ad
LR
1357 /*
1358 * Process user requests only after previous user/driver/core
1359 * requests have been processed
1360 */
1a919318
JB
1361 if ((last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1362 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1363 last_request->initiator == NL80211_REGDOM_SET_BY_USER) &&
1364 regdom_changes(last_request->alpha2))
2f92212b 1365 return REG_REQ_IGNORE;
5eebade6 1366
baeb66fe 1367 if (!regdom_changes(pending_request->alpha2))
2f92212b 1368 return REG_REQ_ALREADY_SET;
e74b1e7f 1369
2f92212b 1370 return REG_REQ_OK;
84fa4f43
JB
1371 }
1372
2f92212b 1373 return REG_REQ_IGNORE;
84fa4f43
JB
1374}
1375
b2e253cf
LR
1376static void reg_set_request_processed(void)
1377{
1378 bool need_more_processing = false;
1379
1380 last_request->processed = true;
1381
1382 spin_lock(&reg_requests_lock);
1383 if (!list_empty(&reg_requests_list))
1384 need_more_processing = true;
1385 spin_unlock(&reg_requests_lock);
1386
a90c7a31 1387 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
fe20b39e 1388 cancel_delayed_work(&reg_timeout);
a90c7a31 1389
b2e253cf
LR
1390 if (need_more_processing)
1391 schedule_work(&reg_work);
1392}
1393
d1c96a9a
LR
1394/**
1395 * __regulatory_hint - hint to the wireless core a regulatory domain
1396 * @wiphy: if the hint comes from country information from an AP, this
1397 * is required to be set to the wiphy that received the information
28da32d7 1398 * @pending_request: the regulatory request currently being processed
d1c96a9a
LR
1399 *
1400 * The Wireless subsystem can use this function to hint to the wireless core
28da32d7 1401 * what it believes should be the current regulatory domain.
d1c96a9a 1402 *
2f92212b 1403 * Returns one of the different reg request treatment values.
d1c96a9a 1404 *
abc7381b 1405 * Caller must hold &cfg80211_mutex and &reg_mutex
d1c96a9a 1406 */
2f92212b
JB
1407static enum reg_request_treatment
1408__regulatory_hint(struct wiphy *wiphy,
1409 struct regulatory_request *pending_request)
b2e1b302 1410{
e9763c3c 1411 const struct ieee80211_regdomain *regd;
9c96477d 1412 bool intersect = false;
2f92212b 1413 enum reg_request_treatment treatment;
b2e1b302 1414
761cf7ec
LR
1415 assert_cfg80211_lock();
1416
2f92212b 1417 treatment = get_reg_request_treatment(wiphy, pending_request);
9c96477d 1418
2f92212b
JB
1419 switch (treatment) {
1420 case REG_REQ_INTERSECT:
7db90f4a
LR
1421 if (pending_request->initiator ==
1422 NL80211_REGDOM_SET_BY_DRIVER) {
e9763c3c
JB
1423 regd = reg_copy_regd(cfg80211_regdomain);
1424 if (IS_ERR(regd)) {
d951c1dd 1425 kfree(pending_request);
e9763c3c 1426 return PTR_ERR(regd);
d951c1dd 1427 }
e9763c3c 1428 wiphy->regd = regd;
3e0c3ff3 1429 }
9c96477d 1430 intersect = true;
2f92212b
JB
1431 break;
1432 case REG_REQ_OK:
1433 break;
1434 default:
fb1fc7ad
LR
1435 /*
1436 * If the regulatory domain being requested by the
3e0c3ff3 1437 * driver has already been set just copy it to the
fb1fc7ad
LR
1438 * wiphy
1439 */
2f92212b
JB
1440 if (treatment == REG_REQ_ALREADY_SET &&
1441 pending_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) {
e9763c3c
JB
1442 regd = reg_copy_regd(cfg80211_regdomain);
1443 if (IS_ERR(regd)) {
d951c1dd 1444 kfree(pending_request);
2f92212b 1445 return REG_REQ_IGNORE;
d951c1dd 1446 }
2f92212b 1447 treatment = REG_REQ_ALREADY_SET;
e9763c3c 1448 wiphy->regd = regd;
3e0c3ff3
LR
1449 goto new_request;
1450 }
d951c1dd 1451 kfree(pending_request);
2f92212b 1452 return treatment;
3e0c3ff3 1453 }
b2e1b302 1454
3e0c3ff3 1455new_request:
a042994d
LR
1456 if (last_request != &core_request_world)
1457 kfree(last_request);
5203cdb6 1458
d951c1dd
LR
1459 last_request = pending_request;
1460 last_request->intersect = intersect;
6913b49a 1461 last_request->processed = false;
5203cdb6 1462
d951c1dd 1463 pending_request = NULL;
3e0c3ff3 1464
09d989d1
LR
1465 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1466 user_alpha2[0] = last_request->alpha2[0];
1467 user_alpha2[1] = last_request->alpha2[1];
1468 }
1469
2f92212b
JB
1470 /* When r == REG_REQ_INTERSECT we do need to call CRDA */
1471 if (treatment != REG_REQ_OK && treatment != REG_REQ_INTERSECT) {
73d54c9e
LR
1472 /*
1473 * Since CRDA will not be called in this case as we already
1474 * have applied the requested regulatory domain before we just
1475 * inform userspace we have processed the request
1476 */
2f92212b 1477 if (treatment == REG_REQ_ALREADY_SET) {
73d54c9e 1478 nl80211_send_reg_change_event(last_request);
b2e253cf
LR
1479 reg_set_request_processed();
1480 }
2f92212b 1481 return treatment;
73d54c9e 1482 }
3e0c3ff3 1483
2f92212b
JB
1484 if (call_crda(last_request->alpha2))
1485 return REG_REQ_IGNORE;
1486 return REG_REQ_OK;
b2e1b302
LR
1487}
1488
30a548c7 1489/* This processes *all* regulatory hints */
8848bef0
LR
1490static void reg_process_hint(struct regulatory_request *reg_request,
1491 enum nl80211_reg_initiator reg_initiator)
fe33eb39 1492{
fe33eb39
LR
1493 struct wiphy *wiphy = NULL;
1494
fdc9d7b2
JB
1495 if (WARN_ON(!reg_request->alpha2))
1496 return;
fe33eb39 1497
f4173766 1498 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
fe33eb39
LR
1499 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1500
1a919318 1501 if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER && !wiphy) {
d951c1dd 1502 kfree(reg_request);
b0e2880b 1503 return;
fe33eb39
LR
1504 }
1505
2f92212b
JB
1506 switch (__regulatory_hint(wiphy, reg_request)) {
1507 case REG_REQ_ALREADY_SET:
1508 /* This is required so that the orig_* parameters are saved */
1509 if (wiphy && wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
1510 wiphy_update_regulatory(wiphy, reg_initiator);
1511 break;
1512 default:
1513 if (reg_initiator == NL80211_REGDOM_SET_BY_USER)
1514 schedule_delayed_work(&reg_timeout,
1515 msecs_to_jiffies(3142));
1516 break;
a90c7a31 1517 }
fe33eb39
LR
1518}
1519
b2e253cf
LR
1520/*
1521 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1522 * Regulatory hints come on a first come first serve basis and we
1523 * must process each one atomically.
1524 */
fe33eb39 1525static void reg_process_pending_hints(void)
b0e2880b 1526{
fe33eb39 1527 struct regulatory_request *reg_request;
fe33eb39 1528
b0e2880b
LR
1529 mutex_lock(&cfg80211_mutex);
1530 mutex_lock(&reg_mutex);
1531
b2e253cf
LR
1532 /* When last_request->processed becomes true this will be rescheduled */
1533 if (last_request && !last_request->processed) {
1a919318 1534 REG_DBG_PRINT("Pending regulatory request, waiting for it to be processed...\n");
b2e253cf
LR
1535 goto out;
1536 }
1537
fe33eb39 1538 spin_lock(&reg_requests_lock);
fe33eb39 1539
b2e253cf 1540 if (list_empty(&reg_requests_list)) {
d951c1dd 1541 spin_unlock(&reg_requests_lock);
b2e253cf 1542 goto out;
fe33eb39 1543 }
b2e253cf
LR
1544
1545 reg_request = list_first_entry(&reg_requests_list,
1546 struct regulatory_request,
1547 list);
1548 list_del_init(&reg_request->list);
1549
fe33eb39 1550 spin_unlock(&reg_requests_lock);
b0e2880b 1551
8848bef0 1552 reg_process_hint(reg_request, reg_request->initiator);
b2e253cf
LR
1553
1554out:
b0e2880b
LR
1555 mutex_unlock(&reg_mutex);
1556 mutex_unlock(&cfg80211_mutex);
fe33eb39
LR
1557}
1558
e38f8a7a
LR
1559/* Processes beacon hints -- this has nothing to do with country IEs */
1560static void reg_process_pending_beacon_hints(void)
1561{
79c97e97 1562 struct cfg80211_registered_device *rdev;
e38f8a7a
LR
1563 struct reg_beacon *pending_beacon, *tmp;
1564
abc7381b
LR
1565 /*
1566 * No need to hold the reg_mutex here as we just touch wiphys
1567 * and do not read or access regulatory variables.
1568 */
e38f8a7a
LR
1569 mutex_lock(&cfg80211_mutex);
1570
1571 /* This goes through the _pending_ beacon list */
1572 spin_lock_bh(&reg_pending_beacons_lock);
1573
e38f8a7a
LR
1574 list_for_each_entry_safe(pending_beacon, tmp,
1575 &reg_pending_beacons, list) {
e38f8a7a
LR
1576 list_del_init(&pending_beacon->list);
1577
1578 /* Applies the beacon hint to current wiphys */
79c97e97
JB
1579 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1580 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
e38f8a7a
LR
1581
1582 /* Remembers the beacon hint for new wiphys or reg changes */
1583 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1584 }
1585
1586 spin_unlock_bh(&reg_pending_beacons_lock);
e38f8a7a
LR
1587 mutex_unlock(&cfg80211_mutex);
1588}
1589
fe33eb39
LR
1590static void reg_todo(struct work_struct *work)
1591{
1592 reg_process_pending_hints();
e38f8a7a 1593 reg_process_pending_beacon_hints();
fe33eb39
LR
1594}
1595
fe33eb39
LR
1596static void queue_regulatory_request(struct regulatory_request *request)
1597{
d4f2c881
JB
1598 request->alpha2[0] = toupper(request->alpha2[0]);
1599 request->alpha2[1] = toupper(request->alpha2[1]);
c61029c7 1600
fe33eb39
LR
1601 spin_lock(&reg_requests_lock);
1602 list_add_tail(&request->list, &reg_requests_list);
1603 spin_unlock(&reg_requests_lock);
1604
1605 schedule_work(&reg_work);
1606}
1607
09d989d1
LR
1608/*
1609 * Core regulatory hint -- happens during cfg80211_init()
1610 * and when we restore regulatory settings.
1611 */
ba25c141
LR
1612static int regulatory_hint_core(const char *alpha2)
1613{
1614 struct regulatory_request *request;
1615
1a919318 1616 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
ba25c141
LR
1617 if (!request)
1618 return -ENOMEM;
1619
1620 request->alpha2[0] = alpha2[0];
1621 request->alpha2[1] = alpha2[1];
7db90f4a 1622 request->initiator = NL80211_REGDOM_SET_BY_CORE;
ba25c141 1623
31e99729 1624 queue_regulatory_request(request);
5078b2e3 1625
fe33eb39 1626 return 0;
ba25c141
LR
1627}
1628
fe33eb39 1629/* User hints */
57b5ce07
LR
1630int regulatory_hint_user(const char *alpha2,
1631 enum nl80211_user_reg_hint_type user_reg_hint_type)
b2e1b302 1632{
fe33eb39
LR
1633 struct regulatory_request *request;
1634
fdc9d7b2
JB
1635 if (WARN_ON(!alpha2))
1636 return -EINVAL;
b2e1b302 1637
fe33eb39
LR
1638 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1639 if (!request)
1640 return -ENOMEM;
1641
f4173766 1642 request->wiphy_idx = WIPHY_IDX_INVALID;
fe33eb39
LR
1643 request->alpha2[0] = alpha2[0];
1644 request->alpha2[1] = alpha2[1];
e12822e1 1645 request->initiator = NL80211_REGDOM_SET_BY_USER;
57b5ce07 1646 request->user_reg_hint_type = user_reg_hint_type;
fe33eb39
LR
1647
1648 queue_regulatory_request(request);
1649
1650 return 0;
1651}
1652
1653/* Driver hints */
1654int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1655{
1656 struct regulatory_request *request;
1657
fdc9d7b2
JB
1658 if (WARN_ON(!alpha2 || !wiphy))
1659 return -EINVAL;
fe33eb39
LR
1660
1661 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1662 if (!request)
1663 return -ENOMEM;
1664
1665 request->wiphy_idx = get_wiphy_idx(wiphy);
1666
fe33eb39
LR
1667 request->alpha2[0] = alpha2[0];
1668 request->alpha2[1] = alpha2[1];
7db90f4a 1669 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
fe33eb39
LR
1670
1671 queue_regulatory_request(request);
1672
1673 return 0;
b2e1b302
LR
1674}
1675EXPORT_SYMBOL(regulatory_hint);
1676
4b44c8bc
LR
1677/*
1678 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1679 * therefore cannot iterate over the rdev list here.
1680 */
1a919318
JB
1681void regulatory_hint_11d(struct wiphy *wiphy, enum ieee80211_band band,
1682 const u8 *country_ie, u8 country_ie_len)
3f2355cb 1683{
3f2355cb 1684 char alpha2[2];
3f2355cb 1685 enum environment_cap env = ENVIRON_ANY;
fe33eb39 1686 struct regulatory_request *request;
3f2355cb 1687
abc7381b 1688 mutex_lock(&reg_mutex);
3f2355cb 1689
9828b017
LR
1690 if (unlikely(!last_request))
1691 goto out;
d335fe63 1692
3f2355cb
LR
1693 /* IE len must be evenly divisible by 2 */
1694 if (country_ie_len & 0x01)
1695 goto out;
1696
1697 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1698 goto out;
1699
3f2355cb
LR
1700 alpha2[0] = country_ie[0];
1701 alpha2[1] = country_ie[1];
1702
1703 if (country_ie[2] == 'I')
1704 env = ENVIRON_INDOOR;
1705 else if (country_ie[2] == 'O')
1706 env = ENVIRON_OUTDOOR;
1707
fb1fc7ad 1708 /*
8b19e6ca 1709 * We will run this only upon a successful connection on cfg80211.
4b44c8bc
LR
1710 * We leave conflict resolution to the workqueue, where can hold
1711 * cfg80211_mutex.
fb1fc7ad 1712 */
f4173766
JB
1713 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1714 last_request->wiphy_idx != WIPHY_IDX_INVALID)
4b44c8bc 1715 goto out;
3f2355cb 1716
fe33eb39
LR
1717 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1718 if (!request)
f9f9b6e3 1719 goto out;
fe33eb39 1720
fe33eb39 1721 request->wiphy_idx = get_wiphy_idx(wiphy);
4f366c5d
JL
1722 request->alpha2[0] = alpha2[0];
1723 request->alpha2[1] = alpha2[1];
7db90f4a 1724 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
fe33eb39
LR
1725 request->country_ie_env = env;
1726
fe33eb39 1727 queue_regulatory_request(request);
3f2355cb 1728out:
abc7381b 1729 mutex_unlock(&reg_mutex);
3f2355cb 1730}
b2e1b302 1731
09d989d1
LR
1732static void restore_alpha2(char *alpha2, bool reset_user)
1733{
1734 /* indicates there is no alpha2 to consider for restoration */
1735 alpha2[0] = '9';
1736 alpha2[1] = '7';
1737
1738 /* The user setting has precedence over the module parameter */
1739 if (is_user_regdom_saved()) {
1740 /* Unless we're asked to ignore it and reset it */
1741 if (reset_user) {
1a919318 1742 REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
09d989d1
LR
1743 user_alpha2[0] = '9';
1744 user_alpha2[1] = '7';
1745
1746 /*
1747 * If we're ignoring user settings, we still need to
1748 * check the module parameter to ensure we put things
1749 * back as they were for a full restore.
1750 */
1751 if (!is_world_regdom(ieee80211_regdom)) {
1a919318
JB
1752 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
1753 ieee80211_regdom[0], ieee80211_regdom[1]);
09d989d1
LR
1754 alpha2[0] = ieee80211_regdom[0];
1755 alpha2[1] = ieee80211_regdom[1];
1756 }
1757 } else {
1a919318
JB
1758 REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
1759 user_alpha2[0], user_alpha2[1]);
09d989d1
LR
1760 alpha2[0] = user_alpha2[0];
1761 alpha2[1] = user_alpha2[1];
1762 }
1763 } else if (!is_world_regdom(ieee80211_regdom)) {
1a919318
JB
1764 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
1765 ieee80211_regdom[0], ieee80211_regdom[1]);
09d989d1
LR
1766 alpha2[0] = ieee80211_regdom[0];
1767 alpha2[1] = ieee80211_regdom[1];
1768 } else
d91e41b6 1769 REG_DBG_PRINT("Restoring regulatory settings\n");
09d989d1
LR
1770}
1771
5ce543d1
RM
1772static void restore_custom_reg_settings(struct wiphy *wiphy)
1773{
1774 struct ieee80211_supported_band *sband;
1775 enum ieee80211_band band;
1776 struct ieee80211_channel *chan;
1777 int i;
1778
1779 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1780 sband = wiphy->bands[band];
1781 if (!sband)
1782 continue;
1783 for (i = 0; i < sband->n_channels; i++) {
1784 chan = &sband->channels[i];
1785 chan->flags = chan->orig_flags;
1786 chan->max_antenna_gain = chan->orig_mag;
1787 chan->max_power = chan->orig_mpwr;
899852af 1788 chan->beacon_found = false;
5ce543d1
RM
1789 }
1790 }
1791}
1792
09d989d1
LR
1793/*
1794 * Restoring regulatory settings involves ingoring any
1795 * possibly stale country IE information and user regulatory
1796 * settings if so desired, this includes any beacon hints
1797 * learned as we could have traveled outside to another country
1798 * after disconnection. To restore regulatory settings we do
1799 * exactly what we did at bootup:
1800 *
1801 * - send a core regulatory hint
1802 * - send a user regulatory hint if applicable
1803 *
1804 * Device drivers that send a regulatory hint for a specific country
1805 * keep their own regulatory domain on wiphy->regd so that does does
1806 * not need to be remembered.
1807 */
1808static void restore_regulatory_settings(bool reset_user)
1809{
1810 char alpha2[2];
cee0bec5 1811 char world_alpha2[2];
09d989d1 1812 struct reg_beacon *reg_beacon, *btmp;
14609555
LR
1813 struct regulatory_request *reg_request, *tmp;
1814 LIST_HEAD(tmp_reg_req_list);
5ce543d1 1815 struct cfg80211_registered_device *rdev;
09d989d1
LR
1816
1817 mutex_lock(&cfg80211_mutex);
1818 mutex_lock(&reg_mutex);
1819
379b82f4 1820 reset_regdomains(true, cfg80211_world_regdom);
09d989d1
LR
1821 restore_alpha2(alpha2, reset_user);
1822
14609555
LR
1823 /*
1824 * If there's any pending requests we simply
1825 * stash them to a temporary pending queue and
1826 * add then after we've restored regulatory
1827 * settings.
1828 */
1829 spin_lock(&reg_requests_lock);
fea9bced
JB
1830 list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
1831 if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER)
1832 continue;
1833 list_move_tail(&reg_request->list, &tmp_reg_req_list);
14609555
LR
1834 }
1835 spin_unlock(&reg_requests_lock);
1836
09d989d1
LR
1837 /* Clear beacon hints */
1838 spin_lock_bh(&reg_pending_beacons_lock);
fea9bced
JB
1839 list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
1840 list_del(&reg_beacon->list);
1841 kfree(reg_beacon);
09d989d1
LR
1842 }
1843 spin_unlock_bh(&reg_pending_beacons_lock);
1844
fea9bced
JB
1845 list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
1846 list_del(&reg_beacon->list);
1847 kfree(reg_beacon);
09d989d1
LR
1848 }
1849
1850 /* First restore to the basic regulatory settings */
379b82f4
JB
1851 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
1852 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
09d989d1 1853
5ce543d1
RM
1854 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1855 if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1856 restore_custom_reg_settings(&rdev->wiphy);
1857 }
1858
cee0bec5 1859 regulatory_hint_core(world_alpha2);
09d989d1
LR
1860
1861 /*
1862 * This restores the ieee80211_regdom module parameter
1863 * preference or the last user requested regulatory
1864 * settings, user regulatory settings takes precedence.
1865 */
1866 if (is_an_alpha2(alpha2))
57b5ce07 1867 regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
09d989d1 1868
14609555 1869 spin_lock(&reg_requests_lock);
11cff96c 1870 list_splice_tail_init(&tmp_reg_req_list, &reg_requests_list);
14609555
LR
1871 spin_unlock(&reg_requests_lock);
1872
1873 mutex_unlock(&reg_mutex);
1874 mutex_unlock(&cfg80211_mutex);
1875
1876 REG_DBG_PRINT("Kicking the queue\n");
1877
1878 schedule_work(&reg_work);
1879}
09d989d1
LR
1880
1881void regulatory_hint_disconnect(void)
1882{
1a919318 1883 REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
09d989d1
LR
1884 restore_regulatory_settings(false);
1885}
1886
e38f8a7a
LR
1887static bool freq_is_chan_12_13_14(u16 freq)
1888{
59eb21a6
BR
1889 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
1890 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
1891 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
e38f8a7a
LR
1892 return true;
1893 return false;
1894}
1895
1896int regulatory_hint_found_beacon(struct wiphy *wiphy,
1897 struct ieee80211_channel *beacon_chan,
1898 gfp_t gfp)
1899{
1900 struct reg_beacon *reg_beacon;
1901
1a919318
JB
1902 if (beacon_chan->beacon_found ||
1903 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
e38f8a7a 1904 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1a919318 1905 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
e38f8a7a
LR
1906 return 0;
1907
1908 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1909 if (!reg_beacon)
1910 return -ENOMEM;
1911
1a919318 1912 REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
4113f751
LR
1913 beacon_chan->center_freq,
1914 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1915 wiphy_name(wiphy));
1916
e38f8a7a 1917 memcpy(&reg_beacon->chan, beacon_chan,
1a919318 1918 sizeof(struct ieee80211_channel));
e38f8a7a
LR
1919
1920 /*
1921 * Since we can be called from BH or and non-BH context
1922 * we must use spin_lock_bh()
1923 */
1924 spin_lock_bh(&reg_pending_beacons_lock);
1925 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1926 spin_unlock_bh(&reg_pending_beacons_lock);
1927
1928 schedule_work(&reg_work);
1929
1930 return 0;
1931}
1932
a3d2eaf0 1933static void print_rd_rules(const struct ieee80211_regdomain *rd)
b2e1b302
LR
1934{
1935 unsigned int i;
a3d2eaf0
JB
1936 const struct ieee80211_reg_rule *reg_rule = NULL;
1937 const struct ieee80211_freq_range *freq_range = NULL;
1938 const struct ieee80211_power_rule *power_rule = NULL;
b2e1b302 1939
6653325a 1940 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
b2e1b302
LR
1941
1942 for (i = 0; i < rd->n_reg_rules; i++) {
1943 reg_rule = &rd->reg_rules[i];
1944 freq_range = &reg_rule->freq_range;
1945 power_rule = &reg_rule->power_rule;
1946
fb1fc7ad
LR
1947 /*
1948 * There may not be documentation for max antenna gain
1949 * in certain regions
1950 */
b2e1b302 1951 if (power_rule->max_antenna_gain)
6653325a 1952 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
b2e1b302
LR
1953 freq_range->start_freq_khz,
1954 freq_range->end_freq_khz,
1955 freq_range->max_bandwidth_khz,
1956 power_rule->max_antenna_gain,
1957 power_rule->max_eirp);
1958 else
6653325a 1959 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
b2e1b302
LR
1960 freq_range->start_freq_khz,
1961 freq_range->end_freq_khz,
1962 freq_range->max_bandwidth_khz,
1963 power_rule->max_eirp);
1964 }
1965}
1966
8b60b078
LR
1967bool reg_supported_dfs_region(u8 dfs_region)
1968{
1969 switch (dfs_region) {
1970 case NL80211_DFS_UNSET:
1971 case NL80211_DFS_FCC:
1972 case NL80211_DFS_ETSI:
1973 case NL80211_DFS_JP:
1974 return true;
1975 default:
1976 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
1977 dfs_region);
1978 return false;
1979 }
1980}
1981
1982static void print_dfs_region(u8 dfs_region)
1983{
1984 if (!dfs_region)
1985 return;
1986
1987 switch (dfs_region) {
1988 case NL80211_DFS_FCC:
1989 pr_info(" DFS Master region FCC");
1990 break;
1991 case NL80211_DFS_ETSI:
1992 pr_info(" DFS Master region ETSI");
1993 break;
1994 case NL80211_DFS_JP:
1995 pr_info(" DFS Master region JP");
1996 break;
1997 default:
1a919318 1998 pr_info(" DFS Master region Unknown");
8b60b078
LR
1999 break;
2000 }
2001}
2002
a3d2eaf0 2003static void print_regdomain(const struct ieee80211_regdomain *rd)
b2e1b302
LR
2004{
2005
3f2355cb 2006 if (is_intersected_alpha2(rd->alpha2)) {
7db90f4a
LR
2007 if (last_request->initiator ==
2008 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
79c97e97
JB
2009 struct cfg80211_registered_device *rdev;
2010 rdev = cfg80211_rdev_by_wiphy_idx(
806a9e39 2011 last_request->wiphy_idx);
79c97e97 2012 if (rdev) {
e9c0268f 2013 pr_info("Current regulatory domain updated by AP to: %c%c\n",
79c97e97
JB
2014 rdev->country_ie_alpha2[0],
2015 rdev->country_ie_alpha2[1]);
3f2355cb 2016 } else
e9c0268f 2017 pr_info("Current regulatory domain intersected:\n");
3f2355cb 2018 } else
e9c0268f 2019 pr_info("Current regulatory domain intersected:\n");
1a919318 2020 } else if (is_world_regdom(rd->alpha2)) {
e9c0268f 2021 pr_info("World regulatory domain updated:\n");
1a919318 2022 } else {
b2e1b302 2023 if (is_unknown_alpha2(rd->alpha2))
e9c0268f 2024 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
57b5ce07
LR
2025 else {
2026 if (reg_request_cell_base(last_request))
1a919318 2027 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
57b5ce07
LR
2028 rd->alpha2[0], rd->alpha2[1]);
2029 else
1a919318 2030 pr_info("Regulatory domain changed to country: %c%c\n",
57b5ce07
LR
2031 rd->alpha2[0], rd->alpha2[1]);
2032 }
b2e1b302 2033 }
1a919318 2034
8b60b078 2035 print_dfs_region(rd->dfs_region);
b2e1b302
LR
2036 print_rd_rules(rd);
2037}
2038
2df78167 2039static void print_regdomain_info(const struct ieee80211_regdomain *rd)
b2e1b302 2040{
e9c0268f 2041 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
b2e1b302
LR
2042 print_rd_rules(rd);
2043}
2044
d2372b31 2045/* Takes ownership of rd only if it doesn't fail */
a3d2eaf0 2046static int __set_regdom(const struct ieee80211_regdomain *rd)
b2e1b302 2047{
e9763c3c 2048 const struct ieee80211_regdomain *regd;
9c96477d 2049 const struct ieee80211_regdomain *intersected_rd = NULL;
806a9e39 2050 struct wiphy *request_wiphy;
6913b49a 2051
b2e1b302
LR
2052 /* Some basic sanity checks first */
2053
6913b49a
JB
2054 if (!reg_is_valid_request(rd->alpha2))
2055 return -EINVAL;
2056
b2e1b302 2057 if (is_world_regdom(rd->alpha2)) {
b2e1b302
LR
2058 update_world_regdomain(rd);
2059 return 0;
2060 }
b2e1b302
LR
2061
2062 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1a919318 2063 !is_unknown_alpha2(rd->alpha2))
b2e1b302
LR
2064 return -EINVAL;
2065
fb1fc7ad
LR
2066 /*
2067 * Lets only bother proceeding on the same alpha2 if the current
3f2355cb 2068 * rd is non static (it means CRDA was present and was used last)
fb1fc7ad
LR
2069 * and the pending request came in from a country IE
2070 */
7db90f4a 2071 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
fb1fc7ad
LR
2072 /*
2073 * If someone else asked us to change the rd lets only bother
2074 * checking if the alpha2 changes if CRDA was already called
2075 */
baeb66fe 2076 if (!regdom_changes(rd->alpha2))
95908535 2077 return -EALREADY;
3f2355cb
LR
2078 }
2079
fb1fc7ad
LR
2080 /*
2081 * Now lets set the regulatory domain, update all driver channels
b2e1b302
LR
2082 * and finally inform them of what we have done, in case they want
2083 * to review or adjust their own settings based on their own
fb1fc7ad
LR
2084 * internal EEPROM data
2085 */
b2e1b302 2086
8375af3b 2087 if (!is_valid_rd(rd)) {
e9c0268f 2088 pr_err("Invalid regulatory domain detected:\n");
8375af3b
LR
2089 print_regdomain_info(rd);
2090 return -EINVAL;
b2e1b302
LR
2091 }
2092
806a9e39 2093 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
0bac71af
LR
2094 if (!request_wiphy &&
2095 (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2096 last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) {
2097 schedule_delayed_work(&reg_timeout, 0);
de3584bd
JB
2098 return -ENODEV;
2099 }
806a9e39 2100
b8295acd 2101 if (!last_request->intersect) {
7db90f4a 2102 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
379b82f4 2103 reset_regdomains(false, rd);
3e0c3ff3
LR
2104 return 0;
2105 }
2106
fb1fc7ad
LR
2107 /*
2108 * For a driver hint, lets copy the regulatory domain the
2109 * driver wanted to the wiphy to deal with conflicts
2110 */
3e0c3ff3 2111
558f6d32
LR
2112 /*
2113 * Userspace could have sent two replies with only
2114 * one kernel request.
2115 */
2116 if (request_wiphy->regd)
2117 return -EALREADY;
3e0c3ff3 2118
e9763c3c
JB
2119 regd = reg_copy_regd(rd);
2120 if (IS_ERR(regd))
2121 return PTR_ERR(regd);
3e0c3ff3 2122
e9763c3c 2123 request_wiphy->regd = regd;
379b82f4 2124 reset_regdomains(false, rd);
b8295acd
LR
2125 return 0;
2126 }
2127
2128 /* Intersection requires a bit more work */
2129
7db90f4a 2130 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
9c96477d
LR
2131 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2132 if (!intersected_rd)
2133 return -EINVAL;
b8295acd 2134
fb1fc7ad
LR
2135 /*
2136 * We can trash what CRDA provided now.
3e0c3ff3 2137 * However if a driver requested this specific regulatory
fb1fc7ad
LR
2138 * domain we keep it for its private use
2139 */
7db90f4a 2140 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
806a9e39 2141 request_wiphy->regd = rd;
3e0c3ff3
LR
2142 else
2143 kfree(rd);
2144
b8295acd
LR
2145 rd = NULL;
2146
379b82f4 2147 reset_regdomains(false, intersected_rd);
b8295acd
LR
2148
2149 return 0;
9c96477d
LR
2150 }
2151
f3baed51 2152 return -EINVAL;
b2e1b302
LR
2153}
2154
2155
fb1fc7ad
LR
2156/*
2157 * Use this call to set the current regulatory domain. Conflicts with
b2e1b302 2158 * multiple drivers can be ironed out later. Caller must've already
fb1fc7ad
LR
2159 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2160 */
a3d2eaf0 2161int set_regdom(const struct ieee80211_regdomain *rd)
b2e1b302 2162{
b2e1b302
LR
2163 int r;
2164
761cf7ec
LR
2165 assert_cfg80211_lock();
2166
abc7381b
LR
2167 mutex_lock(&reg_mutex);
2168
b2e1b302
LR
2169 /* Note that this doesn't update the wiphys, this is done below */
2170 r = __set_regdom(rd);
d2372b31 2171 if (r) {
95908535
KV
2172 if (r == -EALREADY)
2173 reg_set_request_processed();
2174
d2372b31 2175 kfree(rd);
fdc9d7b2 2176 goto out;
d2372b31 2177 }
b2e1b302 2178
b2e1b302 2179 /* This would make this whole thing pointless */
fdc9d7b2
JB
2180 if (WARN_ON(!last_request->intersect && rd != cfg80211_regdomain)) {
2181 r = -EINVAL;
2182 goto out;
2183 }
b2e1b302
LR
2184
2185 /* update all wiphys now with the new established regulatory domain */
f6037d09 2186 update_all_wiphy_regulatory(last_request->initiator);
b2e1b302 2187
a01ddafd 2188 print_regdomain(cfg80211_regdomain);
b2e1b302 2189
73d54c9e
LR
2190 nl80211_send_reg_change_event(last_request);
2191
b2e253cf
LR
2192 reg_set_request_processed();
2193
fdc9d7b2 2194 out:
abc7381b
LR
2195 mutex_unlock(&reg_mutex);
2196
b2e1b302
LR
2197 return r;
2198}
2199
4d9d88d1
SJR
2200#ifdef CONFIG_HOTPLUG
2201int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2202{
2203 if (last_request && !last_request->processed) {
2204 if (add_uevent_var(env, "COUNTRY=%c%c",
2205 last_request->alpha2[0],
2206 last_request->alpha2[1]))
2207 return -ENOMEM;
2208 }
2209
2210 return 0;
2211}
2212#else
2213int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2214{
2215 return -ENODEV;
2216}
2217#endif /* CONFIG_HOTPLUG */
2218
57b5ce07
LR
2219void wiphy_regulatory_register(struct wiphy *wiphy)
2220{
57b5ce07
LR
2221 mutex_lock(&reg_mutex);
2222
2223 if (!reg_dev_ignore_cell_hint(wiphy))
2224 reg_num_devs_support_basehint++;
2225
14cdf112 2226 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
f8a1c774 2227
14cdf112 2228 mutex_unlock(&reg_mutex);
57b5ce07
LR
2229}
2230
a1794390 2231/* Caller must hold cfg80211_mutex */
bfead080 2232void wiphy_regulatory_deregister(struct wiphy *wiphy)
3f2355cb 2233{
0ad8acaf 2234 struct wiphy *request_wiphy = NULL;
806a9e39 2235
abc7381b
LR
2236 mutex_lock(&reg_mutex);
2237
57b5ce07
LR
2238 if (!reg_dev_ignore_cell_hint(wiphy))
2239 reg_num_devs_support_basehint--;
2240
0ef9ccdd
CW
2241 kfree(wiphy->regd);
2242
0ad8acaf
LR
2243 if (last_request)
2244 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
806a9e39 2245
0ef9ccdd 2246 if (!request_wiphy || request_wiphy != wiphy)
abc7381b 2247 goto out;
0ef9ccdd 2248
f4173766 2249 last_request->wiphy_idx = WIPHY_IDX_INVALID;
3f2355cb 2250 last_request->country_ie_env = ENVIRON_ANY;
abc7381b
LR
2251out:
2252 mutex_unlock(&reg_mutex);
3f2355cb
LR
2253}
2254
a90c7a31
LR
2255static void reg_timeout_work(struct work_struct *work)
2256{
1a919318 2257 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
a90c7a31
LR
2258 restore_regulatory_settings(true);
2259}
2260
2fcc9f73 2261int __init regulatory_init(void)
b2e1b302 2262{
bcf4f99b 2263 int err = 0;
734366de 2264
b2e1b302
LR
2265 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2266 if (IS_ERR(reg_pdev))
2267 return PTR_ERR(reg_pdev);
734366de 2268
4d9d88d1
SJR
2269 reg_pdev->dev.type = &reg_device_type;
2270
fe33eb39 2271 spin_lock_init(&reg_requests_lock);
e38f8a7a 2272 spin_lock_init(&reg_pending_beacons_lock);
fe33eb39 2273
80007efe
LR
2274 reg_regdb_size_check();
2275
a3d2eaf0 2276 cfg80211_regdomain = cfg80211_world_regdom;
734366de 2277
09d989d1
LR
2278 user_alpha2[0] = '9';
2279 user_alpha2[1] = '7';
2280
ae9e4b0d
LR
2281 /* We always try to get an update for the static regdomain */
2282 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
ba25c141 2283 if (err) {
bcf4f99b
LR
2284 if (err == -ENOMEM)
2285 return err;
2286 /*
2287 * N.B. kobject_uevent_env() can fail mainly for when we're out
2288 * memory which is handled and propagated appropriately above
2289 * but it can also fail during a netlink_broadcast() or during
2290 * early boot for call_usermodehelper(). For now treat these
2291 * errors as non-fatal.
2292 */
e9c0268f 2293 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
bcf4f99b 2294 }
734366de 2295
ae9e4b0d
LR
2296 /*
2297 * Finally, if the user set the module parameter treat it
2298 * as a user hint.
2299 */
2300 if (!is_world_regdom(ieee80211_regdom))
57b5ce07
LR
2301 regulatory_hint_user(ieee80211_regdom,
2302 NL80211_USER_REG_HINT_USER);
ae9e4b0d 2303
b2e1b302
LR
2304 return 0;
2305}
2306
1a919318 2307void regulatory_exit(void)
b2e1b302 2308{
fe33eb39 2309 struct regulatory_request *reg_request, *tmp;
e38f8a7a 2310 struct reg_beacon *reg_beacon, *btmp;
fe33eb39
LR
2311
2312 cancel_work_sync(&reg_work);
a90c7a31 2313 cancel_delayed_work_sync(&reg_timeout);
fe33eb39 2314
9027b149 2315 /* Lock to suppress warnings */
a1794390 2316 mutex_lock(&cfg80211_mutex);
abc7381b 2317 mutex_lock(&reg_mutex);
379b82f4 2318 reset_regdomains(true, NULL);
9027b149
JB
2319 mutex_unlock(&cfg80211_mutex);
2320 mutex_unlock(&reg_mutex);
734366de 2321
58ebacc6 2322 dev_set_uevent_suppress(&reg_pdev->dev, true);
f6037d09 2323
b2e1b302 2324 platform_device_unregister(reg_pdev);
734366de 2325
fea9bced
JB
2326 list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
2327 list_del(&reg_beacon->list);
2328 kfree(reg_beacon);
e38f8a7a 2329 }
e38f8a7a 2330
fea9bced
JB
2331 list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
2332 list_del(&reg_beacon->list);
2333 kfree(reg_beacon);
e38f8a7a
LR
2334 }
2335
fea9bced
JB
2336 list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
2337 list_del(&reg_request->list);
2338 kfree(reg_request);
fe33eb39 2339 }
8318d78a 2340}