cfg80211: regulatory: allow user to set world regdomain
[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
38fd2143
JB
84/*
85 * Receipt of information from last regulatory request,
86 * protected by RTNL (and can be accessed with RCU protection)
87 */
c492db37
JB
88static struct regulatory_request __rcu *last_request =
89 (void __rcu *)&core_request_world;
734366de 90
b2e1b302
LR
91/* To trigger userspace events */
92static struct platform_device *reg_pdev;
8318d78a 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 97 * information to give us an alpha2.
38fd2143 98 * (protected by RTNL, can be read under RCU)
fb1fc7ad 99 */
458f4f9e 100const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
734366de 101
57b5ce07
LR
102/*
103 * Number of devices that registered to the core
104 * that support cellular base station regulatory hints
38fd2143 105 * (protected by RTNL)
57b5ce07
LR
106 */
107static int reg_num_devs_support_basehint;
108
458f4f9e
JB
109static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
110{
38fd2143 111 return rtnl_dereference(cfg80211_regdomain);
458f4f9e
JB
112}
113
114static const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
115{
38fd2143 116 return rtnl_dereference(wiphy->regd);
458f4f9e
JB
117}
118
3ef121b5
LR
119static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region)
120{
121 switch (dfs_region) {
122 case NL80211_DFS_UNSET:
123 return "unset";
124 case NL80211_DFS_FCC:
125 return "FCC";
126 case NL80211_DFS_ETSI:
127 return "ETSI";
128 case NL80211_DFS_JP:
129 return "JP";
130 }
131 return "Unknown";
132}
133
6c474799
LR
134enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy)
135{
136 const struct ieee80211_regdomain *regd = NULL;
137 const struct ieee80211_regdomain *wiphy_regd = NULL;
138
139 regd = get_cfg80211_regdom();
140 if (!wiphy)
141 goto out;
142
143 wiphy_regd = get_wiphy_regdom(wiphy);
144 if (!wiphy_regd)
145 goto out;
146
147 if (wiphy_regd->dfs_region == regd->dfs_region)
148 goto out;
149
150 REG_DBG_PRINT("%s: device specific dfs_region "
151 "(%s) disagrees with cfg80211's "
152 "central dfs_region (%s)\n",
153 dev_name(&wiphy->dev),
154 reg_dfs_region_str(wiphy_regd->dfs_region),
155 reg_dfs_region_str(regd->dfs_region));
156
157out:
158 return regd->dfs_region;
159}
160
458f4f9e
JB
161static void rcu_free_regdom(const struct ieee80211_regdomain *r)
162{
163 if (!r)
164 return;
165 kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
166}
167
c492db37
JB
168static struct regulatory_request *get_last_request(void)
169{
38fd2143 170 return rcu_dereference_rtnl(last_request);
c492db37
JB
171}
172
e38f8a7a 173/* Used to queue up regulatory hints */
fe33eb39
LR
174static LIST_HEAD(reg_requests_list);
175static spinlock_t reg_requests_lock;
176
e38f8a7a
LR
177/* Used to queue up beacon hints for review */
178static LIST_HEAD(reg_pending_beacons);
179static spinlock_t reg_pending_beacons_lock;
180
181/* Used to keep track of processed beacon hints */
182static LIST_HEAD(reg_beacon_list);
183
184struct reg_beacon {
185 struct list_head list;
186 struct ieee80211_channel chan;
187};
188
f333a7a2
LR
189static void reg_todo(struct work_struct *work);
190static DECLARE_WORK(reg_work, reg_todo);
191
a90c7a31
LR
192static void reg_timeout_work(struct work_struct *work);
193static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
194
734366de
JB
195/* We keep a static world regulatory domain in case of the absence of CRDA */
196static const struct ieee80211_regdomain world_regdom = {
90cdc6df 197 .n_reg_rules = 6,
734366de
JB
198 .alpha2 = "00",
199 .reg_rules = {
68798a62
LR
200 /* IEEE 802.11b/g, channels 1..11 */
201 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
43c771a1
JB
202 /* IEEE 802.11b/g, channels 12..13. */
203 REG_RULE(2467-10, 2472+10, 40, 6, 20,
8fe02e16 204 NL80211_RRF_NO_IR),
611b6a82
LR
205 /* IEEE 802.11 channel 14 - Only JP enables
206 * this and for 802.11b only */
207 REG_RULE(2484-10, 2484+10, 20, 6, 20,
8fe02e16 208 NL80211_RRF_NO_IR |
611b6a82
LR
209 NL80211_RRF_NO_OFDM),
210 /* IEEE 802.11a, channel 36..48 */
131a19bc 211 REG_RULE(5180-10, 5240+10, 160, 6, 20,
8fe02e16 212 NL80211_RRF_NO_IR),
3fc71f77 213
131a19bc
JB
214 /* IEEE 802.11a, channel 52..64 - DFS required */
215 REG_RULE(5260-10, 5320+10, 160, 6, 20,
8fe02e16 216 NL80211_RRF_NO_IR |
131a19bc
JB
217 NL80211_RRF_DFS),
218
219 /* IEEE 802.11a, channel 100..144 - DFS required */
220 REG_RULE(5500-10, 5720+10, 160, 6, 20,
8fe02e16 221 NL80211_RRF_NO_IR |
131a19bc 222 NL80211_RRF_DFS),
3fc71f77
LR
223
224 /* IEEE 802.11a, channel 149..165 */
8ab9d85c 225 REG_RULE(5745-10, 5825+10, 80, 6, 20,
8fe02e16 226 NL80211_RRF_NO_IR),
90cdc6df
VK
227
228 /* IEEE 802.11ad (60gHz), channels 1..3 */
229 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
734366de
JB
230 }
231};
232
38fd2143 233/* protected by RTNL */
a3d2eaf0
JB
234static const struct ieee80211_regdomain *cfg80211_world_regdom =
235 &world_regdom;
734366de 236
6ee7d330 237static char *ieee80211_regdom = "00";
09d989d1 238static char user_alpha2[2];
6ee7d330 239
734366de
JB
240module_param(ieee80211_regdom, charp, 0444);
241MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
242
5ad6ef5e
LR
243static void reg_kfree_last_request(void)
244{
245 struct regulatory_request *lr;
246
247 lr = get_last_request();
248
249 if (lr != &core_request_world && lr)
250 kfree_rcu(lr, rcu_head);
251}
252
05f1a3ea
LR
253static void reg_update_last_request(struct regulatory_request *request)
254{
255 reg_kfree_last_request();
256 rcu_assign_pointer(last_request, request);
257}
258
379b82f4
JB
259static void reset_regdomains(bool full_reset,
260 const struct ieee80211_regdomain *new_regdom)
734366de 261{
458f4f9e
JB
262 const struct ieee80211_regdomain *r;
263
38fd2143 264 ASSERT_RTNL();
e8da2bb4 265
458f4f9e
JB
266 r = get_cfg80211_regdom();
267
942b25cf 268 /* avoid freeing static information or freeing something twice */
458f4f9e
JB
269 if (r == cfg80211_world_regdom)
270 r = NULL;
942b25cf
JB
271 if (cfg80211_world_regdom == &world_regdom)
272 cfg80211_world_regdom = NULL;
458f4f9e
JB
273 if (r == &world_regdom)
274 r = NULL;
942b25cf 275
458f4f9e
JB
276 rcu_free_regdom(r);
277 rcu_free_regdom(cfg80211_world_regdom);
734366de 278
a3d2eaf0 279 cfg80211_world_regdom = &world_regdom;
458f4f9e 280 rcu_assign_pointer(cfg80211_regdomain, new_regdom);
a042994d
LR
281
282 if (!full_reset)
283 return;
284
05f1a3ea 285 reg_update_last_request(&core_request_world);
734366de
JB
286}
287
fb1fc7ad
LR
288/*
289 * Dynamic world regulatory domain requested by the wireless
290 * core upon initialization
291 */
a3d2eaf0 292static void update_world_regdomain(const struct ieee80211_regdomain *rd)
734366de 293{
c492db37 294 struct regulatory_request *lr;
734366de 295
c492db37
JB
296 lr = get_last_request();
297
298 WARN_ON(!lr);
734366de 299
379b82f4 300 reset_regdomains(false, rd);
734366de
JB
301
302 cfg80211_world_regdom = rd;
734366de 303}
734366de 304
a3d2eaf0 305bool is_world_regdom(const char *alpha2)
b2e1b302
LR
306{
307 if (!alpha2)
308 return false;
1a919318 309 return alpha2[0] == '0' && alpha2[1] == '0';
b2e1b302 310}
8318d78a 311
a3d2eaf0 312static bool is_alpha2_set(const char *alpha2)
b2e1b302
LR
313{
314 if (!alpha2)
315 return false;
1a919318 316 return alpha2[0] && alpha2[1];
b2e1b302 317}
8318d78a 318
a3d2eaf0 319static bool is_unknown_alpha2(const char *alpha2)
b2e1b302
LR
320{
321 if (!alpha2)
322 return false;
fb1fc7ad
LR
323 /*
324 * Special case where regulatory domain was built by driver
325 * but a specific alpha2 cannot be determined
326 */
1a919318 327 return alpha2[0] == '9' && alpha2[1] == '9';
b2e1b302 328}
8318d78a 329
3f2355cb
LR
330static bool is_intersected_alpha2(const char *alpha2)
331{
332 if (!alpha2)
333 return false;
fb1fc7ad
LR
334 /*
335 * Special case where regulatory domain is the
3f2355cb 336 * result of an intersection between two regulatory domain
fb1fc7ad
LR
337 * structures
338 */
1a919318 339 return alpha2[0] == '9' && alpha2[1] == '8';
3f2355cb
LR
340}
341
a3d2eaf0 342static bool is_an_alpha2(const char *alpha2)
b2e1b302
LR
343{
344 if (!alpha2)
345 return false;
1a919318 346 return isalpha(alpha2[0]) && isalpha(alpha2[1]);
b2e1b302 347}
8318d78a 348
a3d2eaf0 349static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
b2e1b302
LR
350{
351 if (!alpha2_x || !alpha2_y)
352 return false;
1a919318 353 return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
b2e1b302
LR
354}
355
69b1572b 356static bool regdom_changes(const char *alpha2)
b2e1b302 357{
458f4f9e 358 const struct ieee80211_regdomain *r = get_cfg80211_regdom();
761cf7ec 359
458f4f9e 360 if (!r)
b2e1b302 361 return true;
458f4f9e 362 return !alpha2_equal(r->alpha2, alpha2);
b2e1b302
LR
363}
364
09d989d1
LR
365/*
366 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
367 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
368 * has ever been issued.
369 */
370static bool is_user_regdom_saved(void)
371{
372 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
373 return false;
374
375 /* This would indicate a mistake on the design */
1a919318 376 if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
09d989d1 377 "Unexpected user alpha2: %c%c\n",
1a919318 378 user_alpha2[0], user_alpha2[1]))
09d989d1
LR
379 return false;
380
381 return true;
382}
383
e9763c3c
JB
384static const struct ieee80211_regdomain *
385reg_copy_regd(const struct ieee80211_regdomain *src_regd)
3b377ea9
JL
386{
387 struct ieee80211_regdomain *regd;
e9763c3c 388 int size_of_regd;
3b377ea9
JL
389 unsigned int i;
390
82f20856
JB
391 size_of_regd =
392 sizeof(struct ieee80211_regdomain) +
393 src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
3b377ea9
JL
394
395 regd = kzalloc(size_of_regd, GFP_KERNEL);
396 if (!regd)
e9763c3c 397 return ERR_PTR(-ENOMEM);
3b377ea9
JL
398
399 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
400
401 for (i = 0; i < src_regd->n_reg_rules; i++)
402 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
e9763c3c 403 sizeof(struct ieee80211_reg_rule));
3b377ea9 404
e9763c3c 405 return regd;
3b377ea9
JL
406}
407
408#ifdef CONFIG_CFG80211_INTERNAL_REGDB
409struct reg_regdb_search_request {
410 char alpha2[2];
411 struct list_head list;
412};
413
414static LIST_HEAD(reg_regdb_search_list);
368d06f5 415static DEFINE_MUTEX(reg_regdb_search_mutex);
3b377ea9
JL
416
417static void reg_regdb_search(struct work_struct *work)
418{
419 struct reg_regdb_search_request *request;
e9763c3c
JB
420 const struct ieee80211_regdomain *curdom, *regdom = NULL;
421 int i;
a85d0d7f 422
5fe231e8 423 rtnl_lock();
3b377ea9 424
368d06f5 425 mutex_lock(&reg_regdb_search_mutex);
3b377ea9
JL
426 while (!list_empty(&reg_regdb_search_list)) {
427 request = list_first_entry(&reg_regdb_search_list,
428 struct reg_regdb_search_request,
429 list);
430 list_del(&request->list);
431
1a919318 432 for (i = 0; i < reg_regdb_size; i++) {
3b377ea9
JL
433 curdom = reg_regdb[i];
434
1a919318 435 if (alpha2_equal(request->alpha2, curdom->alpha2)) {
e9763c3c 436 regdom = reg_copy_regd(curdom);
3b377ea9
JL
437 break;
438 }
439 }
440
441 kfree(request);
442 }
368d06f5 443 mutex_unlock(&reg_regdb_search_mutex);
a85d0d7f 444
e9763c3c 445 if (!IS_ERR_OR_NULL(regdom))
a85d0d7f
LR
446 set_regdom(regdom);
447
5fe231e8 448 rtnl_unlock();
3b377ea9
JL
449}
450
451static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
452
453static void reg_regdb_query(const char *alpha2)
454{
455 struct reg_regdb_search_request *request;
456
457 if (!alpha2)
458 return;
459
460 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
461 if (!request)
462 return;
463
464 memcpy(request->alpha2, alpha2, 2);
465
368d06f5 466 mutex_lock(&reg_regdb_search_mutex);
3b377ea9 467 list_add_tail(&request->list, &reg_regdb_search_list);
368d06f5 468 mutex_unlock(&reg_regdb_search_mutex);
3b377ea9
JL
469
470 schedule_work(&reg_regdb_work);
471}
80007efe
LR
472
473/* Feel free to add any other sanity checks here */
474static void reg_regdb_size_check(void)
475{
476 /* We should ideally BUILD_BUG_ON() but then random builds would fail */
477 WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
478}
3b377ea9 479#else
80007efe 480static inline void reg_regdb_size_check(void) {}
3b377ea9
JL
481static inline void reg_regdb_query(const char *alpha2) {}
482#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
483
fb1fc7ad
LR
484/*
485 * This lets us keep regulatory code which is updated on a regulatory
1226d258 486 * basis in userspace.
fb1fc7ad 487 */
b2e1b302
LR
488static int call_crda(const char *alpha2)
489{
1226d258
JB
490 char country[12];
491 char *env[] = { country, NULL };
492
493 snprintf(country, sizeof(country), "COUNTRY=%c%c",
494 alpha2[0], alpha2[1]);
495
b2e1b302 496 if (!is_world_regdom((char *) alpha2))
e9c0268f 497 pr_info("Calling CRDA for country: %c%c\n",
b2e1b302
LR
498 alpha2[0], alpha2[1]);
499 else
e9c0268f 500 pr_info("Calling CRDA to update world regulatory domain\n");
b2e1b302 501
3b377ea9
JL
502 /* query internal regulatory database (if it exists) */
503 reg_regdb_query(alpha2);
504
1226d258 505 return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, env);
b2e1b302
LR
506}
507
fe6631ff
LR
508static enum reg_request_treatment
509reg_call_crda(struct regulatory_request *request)
510{
511 if (call_crda(request->alpha2))
512 return REG_REQ_IGNORE;
513 return REG_REQ_OK;
514}
515
e438768f 516bool reg_is_valid_request(const char *alpha2)
b2e1b302 517{
c492db37 518 struct regulatory_request *lr = get_last_request();
61405e97 519
c492db37 520 if (!lr || lr->processed)
f6037d09
JB
521 return false;
522
c492db37 523 return alpha2_equal(lr->alpha2, alpha2);
b2e1b302 524}
8318d78a 525
e3961af1
JD
526static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
527{
528 struct regulatory_request *lr = get_last_request();
529
530 /*
531 * Follow the driver's regulatory domain, if present, unless a country
532 * IE has been processed or a user wants to help complaince further
533 */
534 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
535 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
536 wiphy->regd)
537 return get_wiphy_regdom(wiphy);
538
539 return get_cfg80211_regdom();
540}
541
97524820
JD
542unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
543 const struct ieee80211_reg_rule *rule)
544{
545 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
546 const struct ieee80211_freq_range *freq_range_tmp;
547 const struct ieee80211_reg_rule *tmp;
548 u32 start_freq, end_freq, idx, no;
549
550 for (idx = 0; idx < rd->n_reg_rules; idx++)
551 if (rule == &rd->reg_rules[idx])
552 break;
553
554 if (idx == rd->n_reg_rules)
555 return 0;
556
557 /* get start_freq */
558 no = idx;
559
560 while (no) {
561 tmp = &rd->reg_rules[--no];
562 freq_range_tmp = &tmp->freq_range;
563
564 if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
565 break;
566
97524820
JD
567 freq_range = freq_range_tmp;
568 }
569
570 start_freq = freq_range->start_freq_khz;
571
572 /* get end_freq */
573 freq_range = &rule->freq_range;
574 no = idx;
575
576 while (no < rd->n_reg_rules - 1) {
577 tmp = &rd->reg_rules[++no];
578 freq_range_tmp = &tmp->freq_range;
579
580 if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
581 break;
582
97524820
JD
583 freq_range = freq_range_tmp;
584 }
585
586 end_freq = freq_range->end_freq_khz;
587
588 return end_freq - start_freq;
589}
590
b2e1b302 591/* Sanity check on a regulatory rule */
a3d2eaf0 592static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
8318d78a 593{
a3d2eaf0 594 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
b2e1b302
LR
595 u32 freq_diff;
596
91e99004 597 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
b2e1b302
LR
598 return false;
599
600 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
601 return false;
602
603 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
604
bd05f28e 605 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
1a919318 606 freq_range->max_bandwidth_khz > freq_diff)
b2e1b302
LR
607 return false;
608
609 return true;
610}
611
a3d2eaf0 612static bool is_valid_rd(const struct ieee80211_regdomain *rd)
b2e1b302 613{
a3d2eaf0 614 const struct ieee80211_reg_rule *reg_rule = NULL;
b2e1b302 615 unsigned int i;
8318d78a 616
b2e1b302
LR
617 if (!rd->n_reg_rules)
618 return false;
8318d78a 619
88dc1c3f
LR
620 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
621 return false;
622
b2e1b302
LR
623 for (i = 0; i < rd->n_reg_rules; i++) {
624 reg_rule = &rd->reg_rules[i];
625 if (!is_valid_reg_rule(reg_rule))
626 return false;
627 }
628
629 return true;
8318d78a
JB
630}
631
038659e7 632static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
fe7ef5e9 633 u32 center_freq_khz, u32 bw_khz)
b2e1b302 634{
038659e7
LR
635 u32 start_freq_khz, end_freq_khz;
636
637 start_freq_khz = center_freq_khz - (bw_khz/2);
638 end_freq_khz = center_freq_khz + (bw_khz/2);
639
640 if (start_freq_khz >= freq_range->start_freq_khz &&
641 end_freq_khz <= freq_range->end_freq_khz)
642 return true;
643
644 return false;
b2e1b302 645}
8318d78a 646
0c7dc45d
LR
647/**
648 * freq_in_rule_band - tells us if a frequency is in a frequency band
649 * @freq_range: frequency rule we want to query
650 * @freq_khz: frequency we are inquiring about
651 *
652 * This lets us know if a specific frequency rule is or is not relevant to
653 * a specific frequency's band. Bands are device specific and artificial
64629b9d
VK
654 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
655 * however it is safe for now to assume that a frequency rule should not be
656 * part of a frequency's band if the start freq or end freq are off by more
657 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
658 * 60 GHz band.
0c7dc45d
LR
659 * This resolution can be lowered and should be considered as we add
660 * regulatory rule support for other "bands".
661 **/
662static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
1a919318 663 u32 freq_khz)
0c7dc45d
LR
664{
665#define ONE_GHZ_IN_KHZ 1000000
64629b9d
VK
666 /*
667 * From 802.11ad: directional multi-gigabit (DMG):
668 * Pertaining to operation in a frequency band containing a channel
669 * with the Channel starting frequency above 45 GHz.
670 */
671 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
672 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
673 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
0c7dc45d 674 return true;
64629b9d 675 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
0c7dc45d
LR
676 return true;
677 return false;
678#undef ONE_GHZ_IN_KHZ
679}
680
adbfb058
LR
681/*
682 * Later on we can perhaps use the more restrictive DFS
683 * region but we don't have information for that yet so
684 * for now simply disallow conflicts.
685 */
686static enum nl80211_dfs_regions
687reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
688 const enum nl80211_dfs_regions dfs_region2)
689{
690 if (dfs_region1 != dfs_region2)
691 return NL80211_DFS_UNSET;
692 return dfs_region1;
693}
694
fb1fc7ad
LR
695/*
696 * Helper for regdom_intersect(), this does the real
697 * mathematical intersection fun
698 */
97524820
JD
699static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
700 const struct ieee80211_regdomain *rd2,
701 const struct ieee80211_reg_rule *rule1,
1a919318
JB
702 const struct ieee80211_reg_rule *rule2,
703 struct ieee80211_reg_rule *intersected_rule)
9c96477d
LR
704{
705 const struct ieee80211_freq_range *freq_range1, *freq_range2;
706 struct ieee80211_freq_range *freq_range;
707 const struct ieee80211_power_rule *power_rule1, *power_rule2;
708 struct ieee80211_power_rule *power_rule;
97524820 709 u32 freq_diff, max_bandwidth1, max_bandwidth2;
9c96477d
LR
710
711 freq_range1 = &rule1->freq_range;
712 freq_range2 = &rule2->freq_range;
713 freq_range = &intersected_rule->freq_range;
714
715 power_rule1 = &rule1->power_rule;
716 power_rule2 = &rule2->power_rule;
717 power_rule = &intersected_rule->power_rule;
718
719 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
1a919318 720 freq_range2->start_freq_khz);
9c96477d 721 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
1a919318 722 freq_range2->end_freq_khz);
97524820
JD
723
724 max_bandwidth1 = freq_range1->max_bandwidth_khz;
725 max_bandwidth2 = freq_range2->max_bandwidth_khz;
726
b0dfd2ea
JD
727 if (rule1->flags & NL80211_RRF_AUTO_BW)
728 max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
729 if (rule2->flags & NL80211_RRF_AUTO_BW)
730 max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
97524820
JD
731
732 freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
9c96477d 733
b0dfd2ea
JD
734 intersected_rule->flags = rule1->flags | rule2->flags;
735
736 /*
737 * In case NL80211_RRF_AUTO_BW requested for both rules
738 * set AUTO_BW in intersected rule also. Next we will
739 * calculate BW correctly in handle_channel function.
740 * In other case remove AUTO_BW flag while we calculate
741 * maximum bandwidth correctly and auto calculation is
742 * not required.
743 */
744 if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
745 (rule2->flags & NL80211_RRF_AUTO_BW))
746 intersected_rule->flags |= NL80211_RRF_AUTO_BW;
747 else
748 intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
749
9c96477d
LR
750 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
751 if (freq_range->max_bandwidth_khz > freq_diff)
752 freq_range->max_bandwidth_khz = freq_diff;
753
754 power_rule->max_eirp = min(power_rule1->max_eirp,
755 power_rule2->max_eirp);
756 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
757 power_rule2->max_antenna_gain);
758
9c96477d
LR
759 if (!is_valid_reg_rule(intersected_rule))
760 return -EINVAL;
761
762 return 0;
763}
764
765/**
766 * regdom_intersect - do the intersection between two regulatory domains
767 * @rd1: first regulatory domain
768 * @rd2: second regulatory domain
769 *
770 * Use this function to get the intersection between two regulatory domains.
771 * Once completed we will mark the alpha2 for the rd as intersected, "98",
772 * as no one single alpha2 can represent this regulatory domain.
773 *
774 * Returns a pointer to the regulatory domain structure which will hold the
775 * resulting intersection of rules between rd1 and rd2. We will
776 * kzalloc() this structure for you.
777 */
1a919318
JB
778static struct ieee80211_regdomain *
779regdom_intersect(const struct ieee80211_regdomain *rd1,
780 const struct ieee80211_regdomain *rd2)
9c96477d
LR
781{
782 int r, size_of_regd;
783 unsigned int x, y;
784 unsigned int num_rules = 0, rule_idx = 0;
785 const struct ieee80211_reg_rule *rule1, *rule2;
786 struct ieee80211_reg_rule *intersected_rule;
787 struct ieee80211_regdomain *rd;
788 /* This is just a dummy holder to help us count */
74f53cd8 789 struct ieee80211_reg_rule dummy_rule;
9c96477d
LR
790
791 if (!rd1 || !rd2)
792 return NULL;
793
fb1fc7ad
LR
794 /*
795 * First we get a count of the rules we'll need, then we actually
9c96477d
LR
796 * build them. This is to so we can malloc() and free() a
797 * regdomain once. The reason we use reg_rules_intersect() here
798 * is it will return -EINVAL if the rule computed makes no sense.
fb1fc7ad
LR
799 * All rules that do check out OK are valid.
800 */
9c96477d
LR
801
802 for (x = 0; x < rd1->n_reg_rules; x++) {
803 rule1 = &rd1->reg_rules[x];
804 for (y = 0; y < rd2->n_reg_rules; y++) {
805 rule2 = &rd2->reg_rules[y];
97524820
JD
806 if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
807 &dummy_rule))
9c96477d 808 num_rules++;
9c96477d
LR
809 }
810 }
811
812 if (!num_rules)
813 return NULL;
814
815 size_of_regd = sizeof(struct ieee80211_regdomain) +
82f20856 816 num_rules * sizeof(struct ieee80211_reg_rule);
9c96477d
LR
817
818 rd = kzalloc(size_of_regd, GFP_KERNEL);
819 if (!rd)
820 return NULL;
821
8a57fff0 822 for (x = 0; x < rd1->n_reg_rules && rule_idx < num_rules; x++) {
9c96477d 823 rule1 = &rd1->reg_rules[x];
8a57fff0 824 for (y = 0; y < rd2->n_reg_rules && rule_idx < num_rules; y++) {
9c96477d 825 rule2 = &rd2->reg_rules[y];
fb1fc7ad
LR
826 /*
827 * This time around instead of using the stack lets
9c96477d 828 * write to the target rule directly saving ourselves
fb1fc7ad
LR
829 * a memcpy()
830 */
9c96477d 831 intersected_rule = &rd->reg_rules[rule_idx];
97524820
JD
832 r = reg_rules_intersect(rd1, rd2, rule1, rule2,
833 intersected_rule);
fb1fc7ad
LR
834 /*
835 * No need to memset here the intersected rule here as
836 * we're not using the stack anymore
837 */
9c96477d
LR
838 if (r)
839 continue;
840 rule_idx++;
841 }
842 }
843
844 if (rule_idx != num_rules) {
845 kfree(rd);
846 return NULL;
847 }
848
849 rd->n_reg_rules = num_rules;
850 rd->alpha2[0] = '9';
851 rd->alpha2[1] = '8';
adbfb058
LR
852 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
853 rd2->dfs_region);
9c96477d
LR
854
855 return rd;
856}
857
fb1fc7ad
LR
858/*
859 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
860 * want to just have the channel structure use these
861 */
b2e1b302
LR
862static u32 map_regdom_flags(u32 rd_flags)
863{
864 u32 channel_flags = 0;
8fe02e16
LR
865 if (rd_flags & NL80211_RRF_NO_IR_ALL)
866 channel_flags |= IEEE80211_CHAN_NO_IR;
b2e1b302
LR
867 if (rd_flags & NL80211_RRF_DFS)
868 channel_flags |= IEEE80211_CHAN_RADAR;
03f6b084
SF
869 if (rd_flags & NL80211_RRF_NO_OFDM)
870 channel_flags |= IEEE80211_CHAN_NO_OFDM;
b2e1b302
LR
871 return channel_flags;
872}
873
361c9c8b
JB
874static const struct ieee80211_reg_rule *
875freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq,
876 const struct ieee80211_regdomain *regd)
8318d78a
JB
877{
878 int i;
0c7dc45d 879 bool band_rule_found = false;
038659e7
LR
880 bool bw_fits = false;
881
3e0c3ff3 882 if (!regd)
361c9c8b 883 return ERR_PTR(-EINVAL);
b2e1b302 884
3e0c3ff3 885 for (i = 0; i < regd->n_reg_rules; i++) {
b2e1b302
LR
886 const struct ieee80211_reg_rule *rr;
887 const struct ieee80211_freq_range *fr = NULL;
b2e1b302 888
3e0c3ff3 889 rr = &regd->reg_rules[i];
b2e1b302 890 fr = &rr->freq_range;
0c7dc45d 891
fb1fc7ad
LR
892 /*
893 * We only need to know if one frequency rule was
0c7dc45d 894 * was in center_freq's band, that's enough, so lets
fb1fc7ad
LR
895 * not overwrite it once found
896 */
0c7dc45d
LR
897 if (!band_rule_found)
898 band_rule_found = freq_in_rule_band(fr, center_freq);
899
fe7ef5e9 900 bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20));
0c7dc45d 901
361c9c8b
JB
902 if (band_rule_found && bw_fits)
903 return rr;
8318d78a
JB
904 }
905
0c7dc45d 906 if (!band_rule_found)
361c9c8b 907 return ERR_PTR(-ERANGE);
0c7dc45d 908
361c9c8b 909 return ERR_PTR(-EINVAL);
b2e1b302
LR
910}
911
361c9c8b
JB
912const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
913 u32 center_freq)
1fa25e41 914{
5d885b99 915 const struct ieee80211_regdomain *regd;
1a919318 916
e3961af1 917 regd = reg_get_regdomain(wiphy);
5d885b99 918
361c9c8b 919 return freq_reg_info_regd(wiphy, center_freq, regd);
1fa25e41 920}
4f366c5d 921EXPORT_SYMBOL(freq_reg_info);
b2e1b302 922
034c6d6e 923const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
926a0a09
LR
924{
925 switch (initiator) {
926 case NL80211_REGDOM_SET_BY_CORE:
034c6d6e 927 return "core";
926a0a09 928 case NL80211_REGDOM_SET_BY_USER:
034c6d6e 929 return "user";
926a0a09 930 case NL80211_REGDOM_SET_BY_DRIVER:
034c6d6e 931 return "driver";
926a0a09 932 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
034c6d6e 933 return "country IE";
926a0a09
LR
934 default:
935 WARN_ON(1);
034c6d6e 936 return "bug";
926a0a09
LR
937 }
938}
034c6d6e 939EXPORT_SYMBOL(reg_initiator_name);
e702d3cf 940
034c6d6e 941#ifdef CONFIG_CFG80211_REG_DEBUG
b0dfd2ea
JD
942static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain *regd,
943 struct ieee80211_channel *chan,
e702d3cf
LR
944 const struct ieee80211_reg_rule *reg_rule)
945{
946 const struct ieee80211_power_rule *power_rule;
947 const struct ieee80211_freq_range *freq_range;
b0dfd2ea 948 char max_antenna_gain[32], bw[32];
e702d3cf
LR
949
950 power_rule = &reg_rule->power_rule;
951 freq_range = &reg_rule->freq_range;
952
953 if (!power_rule->max_antenna_gain)
b0dfd2ea 954 snprintf(max_antenna_gain, sizeof(max_antenna_gain), "N/A");
e702d3cf 955 else
b0dfd2ea
JD
956 snprintf(max_antenna_gain, sizeof(max_antenna_gain), "%d",
957 power_rule->max_antenna_gain);
958
959 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
960 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
961 freq_range->max_bandwidth_khz,
962 reg_get_max_bandwidth(regd, reg_rule));
963 else
964 snprintf(bw, sizeof(bw), "%d KHz",
965 freq_range->max_bandwidth_khz);
e702d3cf 966
fe7ef5e9
JB
967 REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
968 chan->center_freq);
e702d3cf 969
b0dfd2ea 970 REG_DBG_PRINT("%d KHz - %d KHz @ %s), (%s mBi, %d mBm)\n",
1a919318 971 freq_range->start_freq_khz, freq_range->end_freq_khz,
b0dfd2ea 972 bw, max_antenna_gain,
e702d3cf
LR
973 power_rule->max_eirp);
974}
975#else
b0dfd2ea
JD
976static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain *regd,
977 struct ieee80211_channel *chan,
e702d3cf
LR
978 const struct ieee80211_reg_rule *reg_rule)
979{
980 return;
981}
926a0a09
LR
982#endif
983
038659e7
LR
984/*
985 * Note that right now we assume the desired channel bandwidth
986 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
fe7ef5e9 987 * per channel, the primary and the extension channel).
038659e7 988 */
7ca43d03
LR
989static void handle_channel(struct wiphy *wiphy,
990 enum nl80211_reg_initiator initiator,
fdc9d7b2 991 struct ieee80211_channel *chan)
b2e1b302 992{
038659e7 993 u32 flags, bw_flags = 0;
b2e1b302
LR
994 const struct ieee80211_reg_rule *reg_rule = NULL;
995 const struct ieee80211_power_rule *power_rule = NULL;
038659e7 996 const struct ieee80211_freq_range *freq_range = NULL;
fe33eb39 997 struct wiphy *request_wiphy = NULL;
c492db37 998 struct regulatory_request *lr = get_last_request();
97524820
JD
999 const struct ieee80211_regdomain *regd;
1000 u32 max_bandwidth_khz;
a92a3ce7 1001
c492db37 1002 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
a92a3ce7
LR
1003
1004 flags = chan->orig_flags;
b2e1b302 1005
361c9c8b
JB
1006 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
1007 if (IS_ERR(reg_rule)) {
ca4ffe8f
LR
1008 /*
1009 * We will disable all channels that do not match our
25985edc 1010 * received regulatory rule unless the hint is coming
ca4ffe8f
LR
1011 * from a Country IE and the Country IE had no information
1012 * about a band. The IEEE 802.11 spec allows for an AP
1013 * to send only a subset of the regulatory rules allowed,
1014 * so an AP in the US that only supports 2.4 GHz may only send
1015 * a country IE with information for the 2.4 GHz band
1016 * while 5 GHz is still supported.
1017 */
1018 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
361c9c8b 1019 PTR_ERR(reg_rule) == -ERANGE)
ca4ffe8f
LR
1020 return;
1021
cc493e4f
LR
1022 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1023 request_wiphy && request_wiphy == wiphy &&
a2f73b6c 1024 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
cc493e4f
LR
1025 REG_DBG_PRINT("Disabling freq %d MHz for good\n",
1026 chan->center_freq);
1027 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1028 chan->flags = chan->orig_flags;
1029 } else {
1030 REG_DBG_PRINT("Disabling freq %d MHz\n",
1031 chan->center_freq);
1032 chan->flags |= IEEE80211_CHAN_DISABLED;
1033 }
8318d78a 1034 return;
ca4ffe8f 1035 }
8318d78a 1036
b0dfd2ea
JD
1037 regd = reg_get_regdomain(wiphy);
1038 chan_reg_rule_print_dbg(regd, chan, reg_rule);
e702d3cf 1039
b2e1b302 1040 power_rule = &reg_rule->power_rule;
038659e7
LR
1041 freq_range = &reg_rule->freq_range;
1042
97524820
JD
1043 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1044 /* Check if auto calculation requested */
b0dfd2ea 1045 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
97524820 1046 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
97524820
JD
1047
1048 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
038659e7 1049 bw_flags = IEEE80211_CHAN_NO_HT40;
97524820 1050 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
c7a6ee27 1051 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
97524820 1052 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
c7a6ee27 1053 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
b2e1b302 1054
c492db37 1055 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
806a9e39 1056 request_wiphy && request_wiphy == wiphy &&
a2f73b6c 1057 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
fb1fc7ad 1058 /*
25985edc 1059 * This guarantees the driver's requested regulatory domain
f976376d 1060 * will always be used as a base for further regulatory
fb1fc7ad
LR
1061 * settings
1062 */
f976376d 1063 chan->flags = chan->orig_flags =
038659e7 1064 map_regdom_flags(reg_rule->flags) | bw_flags;
f976376d
LR
1065 chan->max_antenna_gain = chan->orig_mag =
1066 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
279f0f55 1067 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
f976376d
LR
1068 (int) MBM_TO_DBM(power_rule->max_eirp);
1069 return;
1070 }
1071
04f39047
SW
1072 chan->dfs_state = NL80211_DFS_USABLE;
1073 chan->dfs_state_entered = jiffies;
1074
aa3d7eef 1075 chan->beacon_found = false;
038659e7 1076 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1a919318
JB
1077 chan->max_antenna_gain =
1078 min_t(int, chan->orig_mag,
1079 MBI_TO_DBI(power_rule->max_antenna_gain));
eccc068e 1080 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
5e31fc08
SG
1081 if (chan->orig_mpwr) {
1082 /*
a09a85a0
LR
1083 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1084 * will always follow the passed country IE power settings.
5e31fc08
SG
1085 */
1086 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
a09a85a0 1087 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
5e31fc08
SG
1088 chan->max_power = chan->max_reg_power;
1089 else
1090 chan->max_power = min(chan->orig_mpwr,
1091 chan->max_reg_power);
1092 } else
1093 chan->max_power = chan->max_reg_power;
8318d78a
JB
1094}
1095
7ca43d03 1096static void handle_band(struct wiphy *wiphy,
fdc9d7b2
JB
1097 enum nl80211_reg_initiator initiator,
1098 struct ieee80211_supported_band *sband)
8318d78a 1099{
a92a3ce7 1100 unsigned int i;
a92a3ce7 1101
fdc9d7b2
JB
1102 if (!sband)
1103 return;
8318d78a
JB
1104
1105 for (i = 0; i < sband->n_channels; i++)
fdc9d7b2 1106 handle_channel(wiphy, initiator, &sband->channels[i]);
8318d78a
JB
1107}
1108
57b5ce07
LR
1109static bool reg_request_cell_base(struct regulatory_request *request)
1110{
1111 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1112 return false;
1a919318 1113 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
57b5ce07
LR
1114}
1115
1116bool reg_last_request_cell_base(void)
1117{
38fd2143 1118 return reg_request_cell_base(get_last_request());
57b5ce07
LR
1119}
1120
1121#ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
57b5ce07 1122/* Core specific check */
2f92212b
JB
1123static enum reg_request_treatment
1124reg_ignore_cell_hint(struct regulatory_request *pending_request)
57b5ce07 1125{
c492db37
JB
1126 struct regulatory_request *lr = get_last_request();
1127
57b5ce07 1128 if (!reg_num_devs_support_basehint)
2f92212b 1129 return REG_REQ_IGNORE;
57b5ce07 1130
c492db37 1131 if (reg_request_cell_base(lr) &&
1a919318 1132 !regdom_changes(pending_request->alpha2))
2f92212b 1133 return REG_REQ_ALREADY_SET;
1a919318 1134
2f92212b 1135 return REG_REQ_OK;
57b5ce07
LR
1136}
1137
1138/* Device specific check */
1139static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1140{
1a919318 1141 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
57b5ce07
LR
1142}
1143#else
1144static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
1145{
2f92212b 1146 return REG_REQ_IGNORE;
57b5ce07 1147}
1a919318
JB
1148
1149static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
57b5ce07
LR
1150{
1151 return true;
1152}
1153#endif
1154
fa1fb9cb
LR
1155static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1156{
a2f73b6c
LR
1157 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1158 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
fa1fb9cb
LR
1159 return true;
1160 return false;
1161}
57b5ce07 1162
7db90f4a
LR
1163static bool ignore_reg_update(struct wiphy *wiphy,
1164 enum nl80211_reg_initiator initiator)
14b9815a 1165{
c492db37
JB
1166 struct regulatory_request *lr = get_last_request();
1167
1168 if (!lr) {
034c6d6e
LR
1169 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1170 "since last_request is not set\n",
926a0a09 1171 reg_initiator_name(initiator));
14b9815a 1172 return true;
926a0a09
LR
1173 }
1174
7db90f4a 1175 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
a2f73b6c 1176 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
034c6d6e
LR
1177 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1178 "since the driver uses its own custom "
1179 "regulatory domain\n",
926a0a09 1180 reg_initiator_name(initiator));
14b9815a 1181 return true;
926a0a09
LR
1182 }
1183
fb1fc7ad
LR
1184 /*
1185 * wiphy->regd will be set once the device has its own
1186 * desired regulatory domain set
1187 */
fa1fb9cb 1188 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
749b527b 1189 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
c492db37 1190 !is_world_regdom(lr->alpha2)) {
034c6d6e
LR
1191 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1192 "since the driver requires its own regulatory "
1193 "domain to be set first\n",
926a0a09 1194 reg_initiator_name(initiator));
14b9815a 1195 return true;
926a0a09
LR
1196 }
1197
c492db37 1198 if (reg_request_cell_base(lr))
57b5ce07
LR
1199 return reg_dev_ignore_cell_hint(wiphy);
1200
14b9815a
LR
1201 return false;
1202}
1203
3195e489
LR
1204static bool reg_is_world_roaming(struct wiphy *wiphy)
1205{
1206 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1207 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1208 struct regulatory_request *lr = get_last_request();
1209
1210 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1211 return true;
1212
1213 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
a2f73b6c 1214 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
3195e489
LR
1215 return true;
1216
1217 return false;
1218}
1219
1a919318 1220static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
e38f8a7a
LR
1221 struct reg_beacon *reg_beacon)
1222{
e38f8a7a
LR
1223 struct ieee80211_supported_band *sband;
1224 struct ieee80211_channel *chan;
6bad8766
LR
1225 bool channel_changed = false;
1226 struct ieee80211_channel chan_before;
e38f8a7a 1227
e38f8a7a
LR
1228 sband = wiphy->bands[reg_beacon->chan.band];
1229 chan = &sband->channels[chan_idx];
1230
1231 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1232 return;
1233
6bad8766
LR
1234 if (chan->beacon_found)
1235 return;
1236
1237 chan->beacon_found = true;
1238
0f500a5f
LR
1239 if (!reg_is_world_roaming(wiphy))
1240 return;
1241
a2f73b6c 1242 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
37184244
LR
1243 return;
1244
6bad8766
LR
1245 chan_before.center_freq = chan->center_freq;
1246 chan_before.flags = chan->flags;
1247
8fe02e16
LR
1248 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1249 chan->flags &= ~IEEE80211_CHAN_NO_IR;
6bad8766 1250 channel_changed = true;
e38f8a7a
LR
1251 }
1252
6bad8766
LR
1253 if (channel_changed)
1254 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
e38f8a7a
LR
1255}
1256
1257/*
1258 * Called when a scan on a wiphy finds a beacon on
1259 * new channel
1260 */
1261static void wiphy_update_new_beacon(struct wiphy *wiphy,
1262 struct reg_beacon *reg_beacon)
1263{
1264 unsigned int i;
1265 struct ieee80211_supported_band *sband;
1266
e38f8a7a
LR
1267 if (!wiphy->bands[reg_beacon->chan.band])
1268 return;
1269
1270 sband = wiphy->bands[reg_beacon->chan.band];
1271
1272 for (i = 0; i < sband->n_channels; i++)
1273 handle_reg_beacon(wiphy, i, reg_beacon);
1274}
1275
1276/*
1277 * Called upon reg changes or a new wiphy is added
1278 */
1279static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1280{
1281 unsigned int i;
1282 struct ieee80211_supported_band *sband;
1283 struct reg_beacon *reg_beacon;
1284
e38f8a7a
LR
1285 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1286 if (!wiphy->bands[reg_beacon->chan.band])
1287 continue;
1288 sband = wiphy->bands[reg_beacon->chan.band];
1289 for (i = 0; i < sband->n_channels; i++)
1290 handle_reg_beacon(wiphy, i, reg_beacon);
1291 }
1292}
1293
e38f8a7a
LR
1294/* Reap the advantages of previously found beacons */
1295static void reg_process_beacons(struct wiphy *wiphy)
1296{
b1ed8ddd
LR
1297 /*
1298 * Means we are just firing up cfg80211, so no beacons would
1299 * have been processed yet.
1300 */
1301 if (!last_request)
1302 return;
e38f8a7a
LR
1303 wiphy_update_beacon_reg(wiphy);
1304}
1305
1a919318 1306static bool is_ht40_allowed(struct ieee80211_channel *chan)
038659e7
LR
1307{
1308 if (!chan)
1a919318 1309 return false;
038659e7 1310 if (chan->flags & IEEE80211_CHAN_DISABLED)
1a919318 1311 return false;
038659e7 1312 /* This would happen when regulatory rules disallow HT40 completely */
55b183ad
FF
1313 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
1314 return false;
1315 return true;
038659e7
LR
1316}
1317
1318static void reg_process_ht_flags_channel(struct wiphy *wiphy,
fdc9d7b2 1319 struct ieee80211_channel *channel)
038659e7 1320{
fdc9d7b2 1321 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
038659e7
LR
1322 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1323 unsigned int i;
1324
1a919318 1325 if (!is_ht40_allowed(channel)) {
038659e7
LR
1326 channel->flags |= IEEE80211_CHAN_NO_HT40;
1327 return;
1328 }
1329
1330 /*
1331 * We need to ensure the extension channels exist to
1332 * be able to use HT40- or HT40+, this finds them (or not)
1333 */
1334 for (i = 0; i < sband->n_channels; i++) {
1335 struct ieee80211_channel *c = &sband->channels[i];
1a919318 1336
038659e7
LR
1337 if (c->center_freq == (channel->center_freq - 20))
1338 channel_before = c;
1339 if (c->center_freq == (channel->center_freq + 20))
1340 channel_after = c;
1341 }
1342
1343 /*
1344 * Please note that this assumes target bandwidth is 20 MHz,
1345 * if that ever changes we also need to change the below logic
1346 * to include that as well.
1347 */
1a919318 1348 if (!is_ht40_allowed(channel_before))
689da1b3 1349 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
038659e7 1350 else
689da1b3 1351 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
038659e7 1352
1a919318 1353 if (!is_ht40_allowed(channel_after))
689da1b3 1354 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
038659e7 1355 else
689da1b3 1356 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
038659e7
LR
1357}
1358
1359static void reg_process_ht_flags_band(struct wiphy *wiphy,
fdc9d7b2 1360 struct ieee80211_supported_band *sband)
038659e7
LR
1361{
1362 unsigned int i;
038659e7 1363
fdc9d7b2
JB
1364 if (!sband)
1365 return;
038659e7
LR
1366
1367 for (i = 0; i < sband->n_channels; i++)
fdc9d7b2 1368 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
038659e7
LR
1369}
1370
1371static void reg_process_ht_flags(struct wiphy *wiphy)
1372{
1373 enum ieee80211_band band;
1374
1375 if (!wiphy)
1376 return;
1377
fdc9d7b2
JB
1378 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1379 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
038659e7
LR
1380}
1381
0e3802db
LR
1382static void reg_call_notifier(struct wiphy *wiphy,
1383 struct regulatory_request *request)
1384{
1385 if (wiphy->reg_notifier)
1386 wiphy->reg_notifier(wiphy, request);
1387}
1388
eac03e38
SN
1389static void wiphy_update_regulatory(struct wiphy *wiphy,
1390 enum nl80211_reg_initiator initiator)
b2e1b302
LR
1391{
1392 enum ieee80211_band band;
c492db37 1393 struct regulatory_request *lr = get_last_request();
eac03e38 1394
0e3802db
LR
1395 if (ignore_reg_update(wiphy, initiator)) {
1396 /*
1397 * Regulatory updates set by CORE are ignored for custom
1398 * regulatory cards. Let us notify the changes to the driver,
1399 * as some drivers used this to restore its orig_* reg domain.
1400 */
1401 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
a2f73b6c 1402 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
0e3802db 1403 reg_call_notifier(wiphy, lr);
a203c2aa 1404 return;
0e3802db 1405 }
a203c2aa 1406
c492db37 1407 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
b68e6b3b 1408
fdc9d7b2
JB
1409 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1410 handle_band(wiphy, initiator, wiphy->bands[band]);
a203c2aa 1411
e38f8a7a 1412 reg_process_beacons(wiphy);
038659e7 1413 reg_process_ht_flags(wiphy);
0e3802db 1414 reg_call_notifier(wiphy, lr);
b2e1b302
LR
1415}
1416
d7549cbb
SN
1417static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1418{
1419 struct cfg80211_registered_device *rdev;
4a38994f 1420 struct wiphy *wiphy;
d7549cbb 1421
5fe231e8 1422 ASSERT_RTNL();
458f4f9e 1423
4a38994f
RM
1424 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1425 wiphy = &rdev->wiphy;
1426 wiphy_update_regulatory(wiphy, initiator);
4a38994f 1427 }
d7549cbb
SN
1428}
1429
1fa25e41 1430static void handle_channel_custom(struct wiphy *wiphy,
fdc9d7b2 1431 struct ieee80211_channel *chan,
1fa25e41
LR
1432 const struct ieee80211_regdomain *regd)
1433{
038659e7 1434 u32 bw_flags = 0;
1fa25e41
LR
1435 const struct ieee80211_reg_rule *reg_rule = NULL;
1436 const struct ieee80211_power_rule *power_rule = NULL;
038659e7 1437 const struct ieee80211_freq_range *freq_range = NULL;
97524820 1438 u32 max_bandwidth_khz;
ac46d48e 1439
361c9c8b
JB
1440 reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1441 regd);
1fa25e41 1442
361c9c8b 1443 if (IS_ERR(reg_rule)) {
fe7ef5e9
JB
1444 REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1445 chan->center_freq);
cc493e4f
LR
1446 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1447 chan->flags = chan->orig_flags;
1fa25e41
LR
1448 return;
1449 }
1450
b0dfd2ea 1451 chan_reg_rule_print_dbg(regd, chan, reg_rule);
e702d3cf 1452
1fa25e41 1453 power_rule = &reg_rule->power_rule;
038659e7
LR
1454 freq_range = &reg_rule->freq_range;
1455
97524820
JD
1456 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1457 /* Check if auto calculation requested */
b0dfd2ea 1458 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
97524820
JD
1459 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1460
1461 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
038659e7 1462 bw_flags = IEEE80211_CHAN_NO_HT40;
97524820 1463 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
c7a6ee27 1464 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
97524820 1465 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
c7a6ee27 1466 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1fa25e41 1467
038659e7 1468 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1fa25e41 1469 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
279f0f55
FF
1470 chan->max_reg_power = chan->max_power =
1471 (int) MBM_TO_DBM(power_rule->max_eirp);
1fa25e41
LR
1472}
1473
fdc9d7b2
JB
1474static void handle_band_custom(struct wiphy *wiphy,
1475 struct ieee80211_supported_band *sband,
1fa25e41
LR
1476 const struct ieee80211_regdomain *regd)
1477{
1478 unsigned int i;
1fa25e41 1479
fdc9d7b2
JB
1480 if (!sband)
1481 return;
1fa25e41
LR
1482
1483 for (i = 0; i < sband->n_channels; i++)
fdc9d7b2 1484 handle_channel_custom(wiphy, &sband->channels[i], regd);
1fa25e41
LR
1485}
1486
1487/* Used by drivers prior to wiphy registration */
1488void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1489 const struct ieee80211_regdomain *regd)
1490{
1491 enum ieee80211_band band;
bbcf3f02 1492 unsigned int bands_set = 0;
ac46d48e 1493
a2f73b6c
LR
1494 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
1495 "wiphy should have REGULATORY_CUSTOM_REG\n");
1496 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
222ea581 1497
1fa25e41 1498 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
bbcf3f02
LR
1499 if (!wiphy->bands[band])
1500 continue;
fdc9d7b2 1501 handle_band_custom(wiphy, wiphy->bands[band], regd);
bbcf3f02 1502 bands_set++;
b2e1b302 1503 }
bbcf3f02
LR
1504
1505 /*
1506 * no point in calling this if it won't have any effect
1a919318 1507 * on your device's supported bands.
bbcf3f02
LR
1508 */
1509 WARN_ON(!bands_set);
b2e1b302 1510}
1fa25e41
LR
1511EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1512
b2e253cf
LR
1513static void reg_set_request_processed(void)
1514{
1515 bool need_more_processing = false;
c492db37 1516 struct regulatory_request *lr = get_last_request();
b2e253cf 1517
c492db37 1518 lr->processed = true;
b2e253cf
LR
1519
1520 spin_lock(&reg_requests_lock);
1521 if (!list_empty(&reg_requests_list))
1522 need_more_processing = true;
1523 spin_unlock(&reg_requests_lock);
1524
c492db37 1525 if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
fe20b39e 1526 cancel_delayed_work(&reg_timeout);
a90c7a31 1527
b2e253cf
LR
1528 if (need_more_processing)
1529 schedule_work(&reg_work);
1530}
1531
b3eb7f3f
LR
1532/**
1533 * reg_process_hint_core - process core regulatory requests
1534 * @pending_request: a pending core regulatory request
1535 *
1536 * The wireless subsystem can use this function to process
1537 * a regulatory request issued by the regulatory core.
1538 *
1539 * Returns one of the different reg request treatment values.
1540 */
1541static enum reg_request_treatment
1542reg_process_hint_core(struct regulatory_request *core_request)
1543{
b3eb7f3f
LR
1544
1545 core_request->intersect = false;
1546 core_request->processed = false;
5ad6ef5e 1547
05f1a3ea 1548 reg_update_last_request(core_request);
b3eb7f3f 1549
fe6631ff 1550 return reg_call_crda(core_request);
b3eb7f3f
LR
1551}
1552
0d97a619
LR
1553static enum reg_request_treatment
1554__reg_process_hint_user(struct regulatory_request *user_request)
1555{
1556 struct regulatory_request *lr = get_last_request();
1557
1558 if (reg_request_cell_base(user_request))
1559 return reg_ignore_cell_hint(user_request);
1560
1561 if (reg_request_cell_base(lr))
1562 return REG_REQ_IGNORE;
1563
1564 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1565 return REG_REQ_INTERSECT;
1566 /*
1567 * If the user knows better the user should set the regdom
1568 * to their country before the IE is picked up
1569 */
1570 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
1571 lr->intersect)
1572 return REG_REQ_IGNORE;
1573 /*
1574 * Process user requests only after previous user/driver/core
1575 * requests have been processed
1576 */
1577 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
1578 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1579 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
1580 regdom_changes(lr->alpha2))
1581 return REG_REQ_IGNORE;
1582
1583 if (!regdom_changes(user_request->alpha2))
1584 return REG_REQ_ALREADY_SET;
1585
1586 return REG_REQ_OK;
1587}
1588
1589/**
1590 * reg_process_hint_user - process user regulatory requests
1591 * @user_request: a pending user regulatory request
1592 *
1593 * The wireless subsystem can use this function to process
1594 * a regulatory request initiated by userspace.
1595 *
1596 * Returns one of the different reg request treatment values.
1597 */
1598static enum reg_request_treatment
1599reg_process_hint_user(struct regulatory_request *user_request)
1600{
1601 enum reg_request_treatment treatment;
0d97a619
LR
1602
1603 treatment = __reg_process_hint_user(user_request);
1604 if (treatment == REG_REQ_IGNORE ||
1605 treatment == REG_REQ_ALREADY_SET) {
1606 kfree(user_request);
1607 return treatment;
1608 }
1609
0d97a619
LR
1610 user_request->intersect = treatment == REG_REQ_INTERSECT;
1611 user_request->processed = false;
5ad6ef5e 1612
05f1a3ea 1613 reg_update_last_request(user_request);
0d97a619
LR
1614
1615 user_alpha2[0] = user_request->alpha2[0];
1616 user_alpha2[1] = user_request->alpha2[1];
1617
fe6631ff 1618 return reg_call_crda(user_request);
0d97a619
LR
1619}
1620
21636c7f
LR
1621static enum reg_request_treatment
1622__reg_process_hint_driver(struct regulatory_request *driver_request)
1623{
1624 struct regulatory_request *lr = get_last_request();
1625
1626 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
1627 if (regdom_changes(driver_request->alpha2))
1628 return REG_REQ_OK;
1629 return REG_REQ_ALREADY_SET;
1630 }
1631
1632 /*
1633 * This would happen if you unplug and plug your card
1634 * back in or if you add a new device for which the previously
1635 * loaded card also agrees on the regulatory domain.
1636 */
1637 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1638 !regdom_changes(driver_request->alpha2))
1639 return REG_REQ_ALREADY_SET;
1640
1641 return REG_REQ_INTERSECT;
1642}
1643
1644/**
1645 * reg_process_hint_driver - process driver regulatory requests
1646 * @driver_request: a pending driver regulatory request
1647 *
1648 * The wireless subsystem can use this function to process
1649 * a regulatory request issued by an 802.11 driver.
1650 *
1651 * Returns one of the different reg request treatment values.
1652 */
1653static enum reg_request_treatment
1654reg_process_hint_driver(struct wiphy *wiphy,
1655 struct regulatory_request *driver_request)
1656{
1657 const struct ieee80211_regdomain *regd;
1658 enum reg_request_treatment treatment;
21636c7f
LR
1659
1660 treatment = __reg_process_hint_driver(driver_request);
1661
1662 switch (treatment) {
1663 case REG_REQ_OK:
1664 break;
1665 case REG_REQ_IGNORE:
1666 kfree(driver_request);
1667 return treatment;
1668 case REG_REQ_INTERSECT:
1669 /* fall through */
1670 case REG_REQ_ALREADY_SET:
1671 regd = reg_copy_regd(get_cfg80211_regdom());
1672 if (IS_ERR(regd)) {
1673 kfree(driver_request);
1674 return REG_REQ_IGNORE;
1675 }
1676 rcu_assign_pointer(wiphy->regd, regd);
1677 }
1678
21636c7f
LR
1679
1680 driver_request->intersect = treatment == REG_REQ_INTERSECT;
1681 driver_request->processed = false;
5ad6ef5e 1682
05f1a3ea 1683 reg_update_last_request(driver_request);
21636c7f
LR
1684
1685 /*
1686 * Since CRDA will not be called in this case as we already
1687 * have applied the requested regulatory domain before we just
1688 * inform userspace we have processed the request
1689 */
1690 if (treatment == REG_REQ_ALREADY_SET) {
1691 nl80211_send_reg_change_event(driver_request);
1692 reg_set_request_processed();
1693 return treatment;
1694 }
1695
fe6631ff 1696 return reg_call_crda(driver_request);
21636c7f
LR
1697}
1698
b23e7a9e
LR
1699static enum reg_request_treatment
1700__reg_process_hint_country_ie(struct wiphy *wiphy,
1701 struct regulatory_request *country_ie_request)
1702{
1703 struct wiphy *last_wiphy = NULL;
1704 struct regulatory_request *lr = get_last_request();
1705
1706 if (reg_request_cell_base(lr)) {
1707 /* Trust a Cell base station over the AP's country IE */
1708 if (regdom_changes(country_ie_request->alpha2))
1709 return REG_REQ_IGNORE;
1710 return REG_REQ_ALREADY_SET;
2a901468
LR
1711 } else {
1712 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
1713 return REG_REQ_IGNORE;
b23e7a9e
LR
1714 }
1715
b23e7a9e
LR
1716 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
1717 return -EINVAL;
2f1c6c57
LR
1718
1719 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
1720 return REG_REQ_OK;
1721
1722 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1723
1724 if (last_wiphy != wiphy) {
b23e7a9e 1725 /*
2f1c6c57
LR
1726 * Two cards with two APs claiming different
1727 * Country IE alpha2s. We could
1728 * intersect them, but that seems unlikely
1729 * to be correct. Reject second one for now.
b23e7a9e 1730 */
2f1c6c57
LR
1731 if (regdom_changes(country_ie_request->alpha2))
1732 return REG_REQ_IGNORE;
b23e7a9e
LR
1733 return REG_REQ_ALREADY_SET;
1734 }
2f1c6c57
LR
1735 /*
1736 * Two consecutive Country IE hints on the same wiphy.
1737 * This should be picked up early by the driver/stack
1738 */
1739 if (WARN_ON(regdom_changes(country_ie_request->alpha2)))
1740 return REG_REQ_OK;
1741 return REG_REQ_ALREADY_SET;
b23e7a9e
LR
1742}
1743
d1c96a9a 1744/**
b23e7a9e
LR
1745 * reg_process_hint_country_ie - process regulatory requests from country IEs
1746 * @country_ie_request: a regulatory request from a country IE
d1c96a9a 1747 *
b23e7a9e
LR
1748 * The wireless subsystem can use this function to process
1749 * a regulatory request issued by a country Information Element.
d1c96a9a 1750 *
2f92212b 1751 * Returns one of the different reg request treatment values.
d1c96a9a 1752 */
2f92212b 1753static enum reg_request_treatment
b23e7a9e
LR
1754reg_process_hint_country_ie(struct wiphy *wiphy,
1755 struct regulatory_request *country_ie_request)
b2e1b302 1756{
2f92212b 1757 enum reg_request_treatment treatment;
761cf7ec 1758
b23e7a9e 1759 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
9c96477d 1760
2f92212b 1761 switch (treatment) {
2f92212b
JB
1762 case REG_REQ_OK:
1763 break;
b23e7a9e
LR
1764 case REG_REQ_IGNORE:
1765 /* fall through */
1766 case REG_REQ_ALREADY_SET:
1767 kfree(country_ie_request);
1768 return treatment;
1769 case REG_REQ_INTERSECT:
1770 kfree(country_ie_request);
fb1fc7ad 1771 /*
b23e7a9e
LR
1772 * This doesn't happen yet, not sure we
1773 * ever want to support it for this case.
fb1fc7ad 1774 */
b23e7a9e
LR
1775 WARN_ONCE(1, "Unexpected intersection for country IEs");
1776 return REG_REQ_IGNORE;
3e0c3ff3 1777 }
b2e1b302 1778
b23e7a9e
LR
1779 country_ie_request->intersect = false;
1780 country_ie_request->processed = false;
5ad6ef5e 1781
05f1a3ea 1782 reg_update_last_request(country_ie_request);
3e0c3ff3 1783
fe6631ff 1784 return reg_call_crda(country_ie_request);
b2e1b302
LR
1785}
1786
30a548c7 1787/* This processes *all* regulatory hints */
1daa37c7 1788static void reg_process_hint(struct regulatory_request *reg_request)
fe33eb39 1789{
fe33eb39 1790 struct wiphy *wiphy = NULL;
b3eb7f3f 1791 enum reg_request_treatment treatment;
fe33eb39 1792
f4173766 1793 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
fe33eb39
LR
1794 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1795
b3eb7f3f
LR
1796 switch (reg_request->initiator) {
1797 case NL80211_REGDOM_SET_BY_CORE:
1798 reg_process_hint_core(reg_request);
1799 return;
1800 case NL80211_REGDOM_SET_BY_USER:
0d97a619
LR
1801 treatment = reg_process_hint_user(reg_request);
1802 if (treatment == REG_REQ_OK ||
1803 treatment == REG_REQ_ALREADY_SET)
1804 return;
845f3351
SD
1805 queue_delayed_work(system_power_efficient_wq,
1806 &reg_timeout, msecs_to_jiffies(3142));
0d97a619 1807 return;
b3eb7f3f 1808 case NL80211_REGDOM_SET_BY_DRIVER:
772f0389
IP
1809 if (!wiphy)
1810 goto out_free;
21636c7f
LR
1811 treatment = reg_process_hint_driver(wiphy, reg_request);
1812 break;
b3eb7f3f 1813 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
772f0389
IP
1814 if (!wiphy)
1815 goto out_free;
b23e7a9e 1816 treatment = reg_process_hint_country_ie(wiphy, reg_request);
b3eb7f3f
LR
1817 break;
1818 default:
1819 WARN(1, "invalid initiator %d\n", reg_request->initiator);
772f0389 1820 goto out_free;
b3eb7f3f
LR
1821 }
1822
b23e7a9e
LR
1823 /* This is required so that the orig_* parameters are saved */
1824 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
a2f73b6c 1825 wiphy->regulatory_flags & REGULATORY_STRICT_REG)
b23e7a9e 1826 wiphy_update_regulatory(wiphy, reg_request->initiator);
772f0389
IP
1827
1828 return;
1829
1830out_free:
1831 kfree(reg_request);
fe33eb39
LR
1832}
1833
b2e253cf
LR
1834/*
1835 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1836 * Regulatory hints come on a first come first serve basis and we
1837 * must process each one atomically.
1838 */
fe33eb39 1839static void reg_process_pending_hints(void)
b0e2880b 1840{
c492db37 1841 struct regulatory_request *reg_request, *lr;
fe33eb39 1842
c492db37 1843 lr = get_last_request();
b0e2880b 1844
b2e253cf 1845 /* When last_request->processed becomes true this will be rescheduled */
c492db37 1846 if (lr && !lr->processed) {
1a919318 1847 REG_DBG_PRINT("Pending regulatory request, waiting for it to be processed...\n");
5fe231e8 1848 return;
b2e253cf
LR
1849 }
1850
fe33eb39 1851 spin_lock(&reg_requests_lock);
fe33eb39 1852
b2e253cf 1853 if (list_empty(&reg_requests_list)) {
d951c1dd 1854 spin_unlock(&reg_requests_lock);
5fe231e8 1855 return;
fe33eb39 1856 }
b2e253cf
LR
1857
1858 reg_request = list_first_entry(&reg_requests_list,
1859 struct regulatory_request,
1860 list);
1861 list_del_init(&reg_request->list);
1862
fe33eb39 1863 spin_unlock(&reg_requests_lock);
b0e2880b 1864
1daa37c7 1865 reg_process_hint(reg_request);
fe33eb39
LR
1866}
1867
e38f8a7a
LR
1868/* Processes beacon hints -- this has nothing to do with country IEs */
1869static void reg_process_pending_beacon_hints(void)
1870{
79c97e97 1871 struct cfg80211_registered_device *rdev;
e38f8a7a
LR
1872 struct reg_beacon *pending_beacon, *tmp;
1873
e38f8a7a
LR
1874 /* This goes through the _pending_ beacon list */
1875 spin_lock_bh(&reg_pending_beacons_lock);
1876
e38f8a7a
LR
1877 list_for_each_entry_safe(pending_beacon, tmp,
1878 &reg_pending_beacons, list) {
e38f8a7a
LR
1879 list_del_init(&pending_beacon->list);
1880
1881 /* Applies the beacon hint to current wiphys */
79c97e97
JB
1882 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1883 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
e38f8a7a
LR
1884
1885 /* Remembers the beacon hint for new wiphys or reg changes */
1886 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1887 }
1888
1889 spin_unlock_bh(&reg_pending_beacons_lock);
e38f8a7a
LR
1890}
1891
fe33eb39
LR
1892static void reg_todo(struct work_struct *work)
1893{
5fe231e8 1894 rtnl_lock();
fe33eb39 1895 reg_process_pending_hints();
e38f8a7a 1896 reg_process_pending_beacon_hints();
5fe231e8 1897 rtnl_unlock();
fe33eb39
LR
1898}
1899
fe33eb39
LR
1900static void queue_regulatory_request(struct regulatory_request *request)
1901{
d4f2c881
JB
1902 request->alpha2[0] = toupper(request->alpha2[0]);
1903 request->alpha2[1] = toupper(request->alpha2[1]);
c61029c7 1904
fe33eb39
LR
1905 spin_lock(&reg_requests_lock);
1906 list_add_tail(&request->list, &reg_requests_list);
1907 spin_unlock(&reg_requests_lock);
1908
1909 schedule_work(&reg_work);
1910}
1911
09d989d1
LR
1912/*
1913 * Core regulatory hint -- happens during cfg80211_init()
1914 * and when we restore regulatory settings.
1915 */
ba25c141
LR
1916static int regulatory_hint_core(const char *alpha2)
1917{
1918 struct regulatory_request *request;
1919
1a919318 1920 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
ba25c141
LR
1921 if (!request)
1922 return -ENOMEM;
1923
1924 request->alpha2[0] = alpha2[0];
1925 request->alpha2[1] = alpha2[1];
7db90f4a 1926 request->initiator = NL80211_REGDOM_SET_BY_CORE;
ba25c141 1927
31e99729 1928 queue_regulatory_request(request);
5078b2e3 1929
fe33eb39 1930 return 0;
ba25c141
LR
1931}
1932
fe33eb39 1933/* User hints */
57b5ce07
LR
1934int regulatory_hint_user(const char *alpha2,
1935 enum nl80211_user_reg_hint_type user_reg_hint_type)
b2e1b302 1936{
fe33eb39
LR
1937 struct regulatory_request *request;
1938
fdc9d7b2
JB
1939 if (WARN_ON(!alpha2))
1940 return -EINVAL;
b2e1b302 1941
fe33eb39
LR
1942 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1943 if (!request)
1944 return -ENOMEM;
1945
f4173766 1946 request->wiphy_idx = WIPHY_IDX_INVALID;
fe33eb39
LR
1947 request->alpha2[0] = alpha2[0];
1948 request->alpha2[1] = alpha2[1];
e12822e1 1949 request->initiator = NL80211_REGDOM_SET_BY_USER;
57b5ce07 1950 request->user_reg_hint_type = user_reg_hint_type;
fe33eb39
LR
1951
1952 queue_regulatory_request(request);
1953
1954 return 0;
1955}
1956
1957/* Driver hints */
1958int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1959{
1960 struct regulatory_request *request;
1961
fdc9d7b2
JB
1962 if (WARN_ON(!alpha2 || !wiphy))
1963 return -EINVAL;
fe33eb39 1964
4f7b9140
LR
1965 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
1966
fe33eb39
LR
1967 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1968 if (!request)
1969 return -ENOMEM;
1970
1971 request->wiphy_idx = get_wiphy_idx(wiphy);
1972
fe33eb39
LR
1973 request->alpha2[0] = alpha2[0];
1974 request->alpha2[1] = alpha2[1];
7db90f4a 1975 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
fe33eb39
LR
1976
1977 queue_regulatory_request(request);
1978
1979 return 0;
b2e1b302
LR
1980}
1981EXPORT_SYMBOL(regulatory_hint);
1982
789fd033
LR
1983void regulatory_hint_country_ie(struct wiphy *wiphy, enum ieee80211_band band,
1984 const u8 *country_ie, u8 country_ie_len)
3f2355cb 1985{
3f2355cb 1986 char alpha2[2];
3f2355cb 1987 enum environment_cap env = ENVIRON_ANY;
db2424c5 1988 struct regulatory_request *request = NULL, *lr;
d335fe63 1989
3f2355cb
LR
1990 /* IE len must be evenly divisible by 2 */
1991 if (country_ie_len & 0x01)
db2424c5 1992 return;
3f2355cb
LR
1993
1994 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
db2424c5
JB
1995 return;
1996
1997 request = kzalloc(sizeof(*request), GFP_KERNEL);
1998 if (!request)
1999 return;
3f2355cb 2000
3f2355cb
LR
2001 alpha2[0] = country_ie[0];
2002 alpha2[1] = country_ie[1];
2003
2004 if (country_ie[2] == 'I')
2005 env = ENVIRON_INDOOR;
2006 else if (country_ie[2] == 'O')
2007 env = ENVIRON_OUTDOOR;
2008
db2424c5
JB
2009 rcu_read_lock();
2010 lr = get_last_request();
2011
2012 if (unlikely(!lr))
2013 goto out;
2014
fb1fc7ad 2015 /*
8b19e6ca 2016 * We will run this only upon a successful connection on cfg80211.
4b44c8bc 2017 * We leave conflict resolution to the workqueue, where can hold
5fe231e8 2018 * the RTNL.
fb1fc7ad 2019 */
c492db37
JB
2020 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
2021 lr->wiphy_idx != WIPHY_IDX_INVALID)
4b44c8bc 2022 goto out;
3f2355cb 2023
fe33eb39 2024 request->wiphy_idx = get_wiphy_idx(wiphy);
4f366c5d
JL
2025 request->alpha2[0] = alpha2[0];
2026 request->alpha2[1] = alpha2[1];
7db90f4a 2027 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
fe33eb39
LR
2028 request->country_ie_env = env;
2029
fe33eb39 2030 queue_regulatory_request(request);
db2424c5 2031 request = NULL;
3f2355cb 2032out:
db2424c5
JB
2033 kfree(request);
2034 rcu_read_unlock();
3f2355cb 2035}
b2e1b302 2036
09d989d1
LR
2037static void restore_alpha2(char *alpha2, bool reset_user)
2038{
2039 /* indicates there is no alpha2 to consider for restoration */
2040 alpha2[0] = '9';
2041 alpha2[1] = '7';
2042
2043 /* The user setting has precedence over the module parameter */
2044 if (is_user_regdom_saved()) {
2045 /* Unless we're asked to ignore it and reset it */
2046 if (reset_user) {
1a919318 2047 REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
09d989d1
LR
2048 user_alpha2[0] = '9';
2049 user_alpha2[1] = '7';
2050
2051 /*
2052 * If we're ignoring user settings, we still need to
2053 * check the module parameter to ensure we put things
2054 * back as they were for a full restore.
2055 */
2056 if (!is_world_regdom(ieee80211_regdom)) {
1a919318
JB
2057 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2058 ieee80211_regdom[0], ieee80211_regdom[1]);
09d989d1
LR
2059 alpha2[0] = ieee80211_regdom[0];
2060 alpha2[1] = ieee80211_regdom[1];
2061 }
2062 } else {
1a919318
JB
2063 REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
2064 user_alpha2[0], user_alpha2[1]);
09d989d1
LR
2065 alpha2[0] = user_alpha2[0];
2066 alpha2[1] = user_alpha2[1];
2067 }
2068 } else if (!is_world_regdom(ieee80211_regdom)) {
1a919318
JB
2069 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2070 ieee80211_regdom[0], ieee80211_regdom[1]);
09d989d1
LR
2071 alpha2[0] = ieee80211_regdom[0];
2072 alpha2[1] = ieee80211_regdom[1];
2073 } else
d91e41b6 2074 REG_DBG_PRINT("Restoring regulatory settings\n");
09d989d1
LR
2075}
2076
5ce543d1
RM
2077static void restore_custom_reg_settings(struct wiphy *wiphy)
2078{
2079 struct ieee80211_supported_band *sband;
2080 enum ieee80211_band band;
2081 struct ieee80211_channel *chan;
2082 int i;
2083
2084 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
2085 sband = wiphy->bands[band];
2086 if (!sband)
2087 continue;
2088 for (i = 0; i < sband->n_channels; i++) {
2089 chan = &sband->channels[i];
2090 chan->flags = chan->orig_flags;
2091 chan->max_antenna_gain = chan->orig_mag;
2092 chan->max_power = chan->orig_mpwr;
899852af 2093 chan->beacon_found = false;
5ce543d1
RM
2094 }
2095 }
2096}
2097
09d989d1
LR
2098/*
2099 * Restoring regulatory settings involves ingoring any
2100 * possibly stale country IE information and user regulatory
2101 * settings if so desired, this includes any beacon hints
2102 * learned as we could have traveled outside to another country
2103 * after disconnection. To restore regulatory settings we do
2104 * exactly what we did at bootup:
2105 *
2106 * - send a core regulatory hint
2107 * - send a user regulatory hint if applicable
2108 *
2109 * Device drivers that send a regulatory hint for a specific country
2110 * keep their own regulatory domain on wiphy->regd so that does does
2111 * not need to be remembered.
2112 */
2113static void restore_regulatory_settings(bool reset_user)
2114{
2115 char alpha2[2];
cee0bec5 2116 char world_alpha2[2];
09d989d1 2117 struct reg_beacon *reg_beacon, *btmp;
14609555
LR
2118 struct regulatory_request *reg_request, *tmp;
2119 LIST_HEAD(tmp_reg_req_list);
5ce543d1 2120 struct cfg80211_registered_device *rdev;
09d989d1 2121
5fe231e8
JB
2122 ASSERT_RTNL();
2123
2d319867 2124 reset_regdomains(true, &world_regdom);
09d989d1
LR
2125 restore_alpha2(alpha2, reset_user);
2126
14609555
LR
2127 /*
2128 * If there's any pending requests we simply
2129 * stash them to a temporary pending queue and
2130 * add then after we've restored regulatory
2131 * settings.
2132 */
2133 spin_lock(&reg_requests_lock);
fea9bced
JB
2134 list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
2135 if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER)
2136 continue;
2137 list_move_tail(&reg_request->list, &tmp_reg_req_list);
14609555
LR
2138 }
2139 spin_unlock(&reg_requests_lock);
2140
09d989d1
LR
2141 /* Clear beacon hints */
2142 spin_lock_bh(&reg_pending_beacons_lock);
fea9bced
JB
2143 list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
2144 list_del(&reg_beacon->list);
2145 kfree(reg_beacon);
09d989d1
LR
2146 }
2147 spin_unlock_bh(&reg_pending_beacons_lock);
2148
fea9bced
JB
2149 list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
2150 list_del(&reg_beacon->list);
2151 kfree(reg_beacon);
09d989d1
LR
2152 }
2153
2154 /* First restore to the basic regulatory settings */
379b82f4
JB
2155 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
2156 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
09d989d1 2157
5ce543d1 2158 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
a2f73b6c 2159 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
5ce543d1
RM
2160 restore_custom_reg_settings(&rdev->wiphy);
2161 }
2162
cee0bec5 2163 regulatory_hint_core(world_alpha2);
09d989d1
LR
2164
2165 /*
2166 * This restores the ieee80211_regdom module parameter
2167 * preference or the last user requested regulatory
2168 * settings, user regulatory settings takes precedence.
2169 */
2170 if (is_an_alpha2(alpha2))
57b5ce07 2171 regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
09d989d1 2172
14609555 2173 spin_lock(&reg_requests_lock);
11cff96c 2174 list_splice_tail_init(&tmp_reg_req_list, &reg_requests_list);
14609555
LR
2175 spin_unlock(&reg_requests_lock);
2176
14609555
LR
2177 REG_DBG_PRINT("Kicking the queue\n");
2178
2179 schedule_work(&reg_work);
2180}
09d989d1
LR
2181
2182void regulatory_hint_disconnect(void)
2183{
1a919318 2184 REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
09d989d1
LR
2185 restore_regulatory_settings(false);
2186}
2187
e38f8a7a
LR
2188static bool freq_is_chan_12_13_14(u16 freq)
2189{
59eb21a6
BR
2190 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
2191 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
2192 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
e38f8a7a
LR
2193 return true;
2194 return false;
2195}
2196
3ebfa6e7
LR
2197static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
2198{
2199 struct reg_beacon *pending_beacon;
2200
2201 list_for_each_entry(pending_beacon, &reg_pending_beacons, list)
2202 if (beacon_chan->center_freq ==
2203 pending_beacon->chan.center_freq)
2204 return true;
2205 return false;
2206}
2207
e38f8a7a
LR
2208int regulatory_hint_found_beacon(struct wiphy *wiphy,
2209 struct ieee80211_channel *beacon_chan,
2210 gfp_t gfp)
2211{
2212 struct reg_beacon *reg_beacon;
3ebfa6e7 2213 bool processing;
e38f8a7a 2214
1a919318
JB
2215 if (beacon_chan->beacon_found ||
2216 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
e38f8a7a 2217 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1a919318 2218 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
e38f8a7a
LR
2219 return 0;
2220
3ebfa6e7
LR
2221 spin_lock_bh(&reg_pending_beacons_lock);
2222 processing = pending_reg_beacon(beacon_chan);
2223 spin_unlock_bh(&reg_pending_beacons_lock);
2224
2225 if (processing)
e38f8a7a
LR
2226 return 0;
2227
2228 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
2229 if (!reg_beacon)
2230 return -ENOMEM;
2231
1a919318 2232 REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
4113f751
LR
2233 beacon_chan->center_freq,
2234 ieee80211_frequency_to_channel(beacon_chan->center_freq),
2235 wiphy_name(wiphy));
2236
e38f8a7a 2237 memcpy(&reg_beacon->chan, beacon_chan,
1a919318 2238 sizeof(struct ieee80211_channel));
e38f8a7a
LR
2239
2240 /*
2241 * Since we can be called from BH or and non-BH context
2242 * we must use spin_lock_bh()
2243 */
2244 spin_lock_bh(&reg_pending_beacons_lock);
2245 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
2246 spin_unlock_bh(&reg_pending_beacons_lock);
2247
2248 schedule_work(&reg_work);
2249
2250 return 0;
2251}
2252
a3d2eaf0 2253static void print_rd_rules(const struct ieee80211_regdomain *rd)
b2e1b302
LR
2254{
2255 unsigned int i;
a3d2eaf0
JB
2256 const struct ieee80211_reg_rule *reg_rule = NULL;
2257 const struct ieee80211_freq_range *freq_range = NULL;
2258 const struct ieee80211_power_rule *power_rule = NULL;
97524820 2259 char bw[32];
b2e1b302 2260
6653325a 2261 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
b2e1b302
LR
2262
2263 for (i = 0; i < rd->n_reg_rules; i++) {
2264 reg_rule = &rd->reg_rules[i];
2265 freq_range = &reg_rule->freq_range;
2266 power_rule = &reg_rule->power_rule;
2267
b0dfd2ea
JD
2268 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
2269 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
2270 freq_range->max_bandwidth_khz,
97524820
JD
2271 reg_get_max_bandwidth(rd, reg_rule));
2272 else
b0dfd2ea 2273 snprintf(bw, sizeof(bw), "%d KHz",
97524820
JD
2274 freq_range->max_bandwidth_khz);
2275
fb1fc7ad
LR
2276 /*
2277 * There may not be documentation for max antenna gain
2278 * in certain regions
2279 */
b2e1b302 2280 if (power_rule->max_antenna_gain)
97524820 2281 pr_info(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm)\n",
b2e1b302
LR
2282 freq_range->start_freq_khz,
2283 freq_range->end_freq_khz,
97524820 2284 bw,
b2e1b302
LR
2285 power_rule->max_antenna_gain,
2286 power_rule->max_eirp);
2287 else
97524820 2288 pr_info(" (%d KHz - %d KHz @ %s), (N/A, %d mBm)\n",
b2e1b302
LR
2289 freq_range->start_freq_khz,
2290 freq_range->end_freq_khz,
97524820 2291 bw,
b2e1b302
LR
2292 power_rule->max_eirp);
2293 }
2294}
2295
4c7d3982 2296bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
8b60b078
LR
2297{
2298 switch (dfs_region) {
2299 case NL80211_DFS_UNSET:
2300 case NL80211_DFS_FCC:
2301 case NL80211_DFS_ETSI:
2302 case NL80211_DFS_JP:
2303 return true;
2304 default:
2305 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2306 dfs_region);
2307 return false;
2308 }
2309}
2310
a3d2eaf0 2311static void print_regdomain(const struct ieee80211_regdomain *rd)
b2e1b302 2312{
c492db37 2313 struct regulatory_request *lr = get_last_request();
b2e1b302 2314
3f2355cb 2315 if (is_intersected_alpha2(rd->alpha2)) {
c492db37 2316 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
79c97e97 2317 struct cfg80211_registered_device *rdev;
c492db37 2318 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
79c97e97 2319 if (rdev) {
e9c0268f 2320 pr_info("Current regulatory domain updated by AP to: %c%c\n",
79c97e97
JB
2321 rdev->country_ie_alpha2[0],
2322 rdev->country_ie_alpha2[1]);
3f2355cb 2323 } else
e9c0268f 2324 pr_info("Current regulatory domain intersected:\n");
3f2355cb 2325 } else
e9c0268f 2326 pr_info("Current regulatory domain intersected:\n");
1a919318 2327 } else if (is_world_regdom(rd->alpha2)) {
e9c0268f 2328 pr_info("World regulatory domain updated:\n");
1a919318 2329 } else {
b2e1b302 2330 if (is_unknown_alpha2(rd->alpha2))
e9c0268f 2331 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
57b5ce07 2332 else {
c492db37 2333 if (reg_request_cell_base(lr))
1a919318 2334 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
57b5ce07
LR
2335 rd->alpha2[0], rd->alpha2[1]);
2336 else
1a919318 2337 pr_info("Regulatory domain changed to country: %c%c\n",
57b5ce07
LR
2338 rd->alpha2[0], rd->alpha2[1]);
2339 }
b2e1b302 2340 }
1a919318 2341
3ef121b5 2342 pr_info(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
b2e1b302
LR
2343 print_rd_rules(rd);
2344}
2345
2df78167 2346static void print_regdomain_info(const struct ieee80211_regdomain *rd)
b2e1b302 2347{
e9c0268f 2348 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
b2e1b302
LR
2349 print_rd_rules(rd);
2350}
2351
3b9e5aca
LR
2352static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
2353{
2354 if (!is_world_regdom(rd->alpha2))
2355 return -EINVAL;
2356 update_world_regdomain(rd);
2357 return 0;
2358}
2359
84721d44
LR
2360static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
2361 struct regulatory_request *user_request)
2362{
2363 const struct ieee80211_regdomain *intersected_rd = NULL;
2364
84721d44
LR
2365 if (!regdom_changes(rd->alpha2))
2366 return -EALREADY;
2367
2368 if (!is_valid_rd(rd)) {
2369 pr_err("Invalid regulatory domain detected:\n");
2370 print_regdomain_info(rd);
2371 return -EINVAL;
2372 }
2373
2374 if (!user_request->intersect) {
2375 reset_regdomains(false, rd);
2376 return 0;
2377 }
2378
2379 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2380 if (!intersected_rd)
2381 return -EINVAL;
2382
2383 kfree(rd);
2384 rd = NULL;
2385 reset_regdomains(false, intersected_rd);
2386
2387 return 0;
2388}
2389
f5fe3247
LR
2390static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
2391 struct regulatory_request *driver_request)
b2e1b302 2392{
e9763c3c 2393 const struct ieee80211_regdomain *regd;
9c96477d 2394 const struct ieee80211_regdomain *intersected_rd = NULL;
f5fe3247 2395 const struct ieee80211_regdomain *tmp;
806a9e39 2396 struct wiphy *request_wiphy;
6913b49a 2397
f5fe3247 2398 if (is_world_regdom(rd->alpha2))
b2e1b302
LR
2399 return -EINVAL;
2400
f5fe3247
LR
2401 if (!regdom_changes(rd->alpha2))
2402 return -EALREADY;
b2e1b302 2403
8375af3b 2404 if (!is_valid_rd(rd)) {
e9c0268f 2405 pr_err("Invalid regulatory domain detected:\n");
8375af3b
LR
2406 print_regdomain_info(rd);
2407 return -EINVAL;
b2e1b302
LR
2408 }
2409
f5fe3247
LR
2410 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
2411 if (!request_wiphy) {
845f3351
SD
2412 queue_delayed_work(system_power_efficient_wq,
2413 &reg_timeout, 0);
de3584bd
JB
2414 return -ENODEV;
2415 }
806a9e39 2416
f5fe3247 2417 if (!driver_request->intersect) {
558f6d32
LR
2418 if (request_wiphy->regd)
2419 return -EALREADY;
3e0c3ff3 2420
e9763c3c
JB
2421 regd = reg_copy_regd(rd);
2422 if (IS_ERR(regd))
2423 return PTR_ERR(regd);
3e0c3ff3 2424
458f4f9e 2425 rcu_assign_pointer(request_wiphy->regd, regd);
379b82f4 2426 reset_regdomains(false, rd);
b8295acd
LR
2427 return 0;
2428 }
2429
f5fe3247
LR
2430 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2431 if (!intersected_rd)
2432 return -EINVAL;
b8295acd 2433
f5fe3247
LR
2434 /*
2435 * We can trash what CRDA provided now.
2436 * However if a driver requested this specific regulatory
2437 * domain we keep it for its private use
2438 */
2439 tmp = get_wiphy_regdom(request_wiphy);
2440 rcu_assign_pointer(request_wiphy->regd, rd);
2441 rcu_free_regdom(tmp);
b8295acd 2442
f5fe3247 2443 rd = NULL;
b7566fc3 2444
f5fe3247 2445 reset_regdomains(false, intersected_rd);
3e0c3ff3 2446
f5fe3247
LR
2447 return 0;
2448}
2449
01992406
LR
2450static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
2451 struct regulatory_request *country_ie_request)
f5fe3247
LR
2452{
2453 struct wiphy *request_wiphy;
b8295acd 2454
f5fe3247
LR
2455 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2456 !is_unknown_alpha2(rd->alpha2))
2457 return -EINVAL;
b8295acd 2458
f5fe3247
LR
2459 /*
2460 * Lets only bother proceeding on the same alpha2 if the current
2461 * rd is non static (it means CRDA was present and was used last)
2462 * and the pending request came in from a country IE
2463 */
2464
2465 if (!is_valid_rd(rd)) {
2466 pr_err("Invalid regulatory domain detected:\n");
2467 print_regdomain_info(rd);
2468 return -EINVAL;
9c96477d
LR
2469 }
2470
01992406 2471 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
f5fe3247 2472 if (!request_wiphy) {
845f3351
SD
2473 queue_delayed_work(system_power_efficient_wq,
2474 &reg_timeout, 0);
f5fe3247
LR
2475 return -ENODEV;
2476 }
b2e1b302 2477
01992406 2478 if (country_ie_request->intersect)
f5fe3247
LR
2479 return -EINVAL;
2480
2481 reset_regdomains(false, rd);
2482 return 0;
2483}
b2e1b302 2484
fb1fc7ad
LR
2485/*
2486 * Use this call to set the current regulatory domain. Conflicts with
b2e1b302 2487 * multiple drivers can be ironed out later. Caller must've already
458f4f9e 2488 * kmalloc'd the rd structure.
fb1fc7ad 2489 */
a3d2eaf0 2490int set_regdom(const struct ieee80211_regdomain *rd)
b2e1b302 2491{
c492db37 2492 struct regulatory_request *lr;
b2e1b302
LR
2493 int r;
2494
3b9e5aca
LR
2495 if (!reg_is_valid_request(rd->alpha2)) {
2496 kfree(rd);
2497 return -EINVAL;
2498 }
2499
c492db37 2500 lr = get_last_request();
abc7381b 2501
b2e1b302 2502 /* Note that this doesn't update the wiphys, this is done below */
3b9e5aca
LR
2503 switch (lr->initiator) {
2504 case NL80211_REGDOM_SET_BY_CORE:
2505 r = reg_set_rd_core(rd);
2506 break;
2507 case NL80211_REGDOM_SET_BY_USER:
84721d44
LR
2508 r = reg_set_rd_user(rd, lr);
2509 break;
3b9e5aca 2510 case NL80211_REGDOM_SET_BY_DRIVER:
f5fe3247
LR
2511 r = reg_set_rd_driver(rd, lr);
2512 break;
3b9e5aca 2513 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
01992406 2514 r = reg_set_rd_country_ie(rd, lr);
3b9e5aca
LR
2515 break;
2516 default:
2517 WARN(1, "invalid initiator %d\n", lr->initiator);
2518 return -EINVAL;
2519 }
2520
d2372b31 2521 if (r) {
95908535
KV
2522 if (r == -EALREADY)
2523 reg_set_request_processed();
2524
d2372b31 2525 kfree(rd);
38fd2143 2526 return r;
d2372b31 2527 }
b2e1b302 2528
b2e1b302 2529 /* This would make this whole thing pointless */
38fd2143
JB
2530 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
2531 return -EINVAL;
b2e1b302
LR
2532
2533 /* update all wiphys now with the new established regulatory domain */
c492db37 2534 update_all_wiphy_regulatory(lr->initiator);
b2e1b302 2535
458f4f9e 2536 print_regdomain(get_cfg80211_regdom());
b2e1b302 2537
c492db37 2538 nl80211_send_reg_change_event(lr);
73d54c9e 2539
b2e253cf
LR
2540 reg_set_request_processed();
2541
38fd2143 2542 return 0;
b2e1b302
LR
2543}
2544
57b5ce07
LR
2545void wiphy_regulatory_register(struct wiphy *wiphy)
2546{
23df0b73
AN
2547 struct regulatory_request *lr;
2548
57b5ce07
LR
2549 if (!reg_dev_ignore_cell_hint(wiphy))
2550 reg_num_devs_support_basehint++;
2551
23df0b73
AN
2552 lr = get_last_request();
2553 wiphy_update_regulatory(wiphy, lr->initiator);
57b5ce07
LR
2554}
2555
bfead080 2556void wiphy_regulatory_deregister(struct wiphy *wiphy)
3f2355cb 2557{
0ad8acaf 2558 struct wiphy *request_wiphy = NULL;
c492db37 2559 struct regulatory_request *lr;
761cf7ec 2560
c492db37 2561 lr = get_last_request();
abc7381b 2562
57b5ce07
LR
2563 if (!reg_dev_ignore_cell_hint(wiphy))
2564 reg_num_devs_support_basehint--;
2565
458f4f9e
JB
2566 rcu_free_regdom(get_wiphy_regdom(wiphy));
2567 rcu_assign_pointer(wiphy->regd, NULL);
0ef9ccdd 2568
c492db37
JB
2569 if (lr)
2570 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
806a9e39 2571
0ef9ccdd 2572 if (!request_wiphy || request_wiphy != wiphy)
38fd2143 2573 return;
0ef9ccdd 2574
c492db37
JB
2575 lr->wiphy_idx = WIPHY_IDX_INVALID;
2576 lr->country_ie_env = ENVIRON_ANY;
3f2355cb
LR
2577}
2578
a90c7a31
LR
2579static void reg_timeout_work(struct work_struct *work)
2580{
1a919318 2581 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
f77b86d7 2582 rtnl_lock();
a90c7a31 2583 restore_regulatory_settings(true);
f77b86d7 2584 rtnl_unlock();
a90c7a31
LR
2585}
2586
2fcc9f73 2587int __init regulatory_init(void)
b2e1b302 2588{
bcf4f99b 2589 int err = 0;
734366de 2590
b2e1b302
LR
2591 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2592 if (IS_ERR(reg_pdev))
2593 return PTR_ERR(reg_pdev);
734366de 2594
fe33eb39 2595 spin_lock_init(&reg_requests_lock);
e38f8a7a 2596 spin_lock_init(&reg_pending_beacons_lock);
fe33eb39 2597
80007efe
LR
2598 reg_regdb_size_check();
2599
458f4f9e 2600 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
734366de 2601
09d989d1
LR
2602 user_alpha2[0] = '9';
2603 user_alpha2[1] = '7';
2604
ae9e4b0d 2605 /* We always try to get an update for the static regdomain */
458f4f9e 2606 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
ba25c141 2607 if (err) {
bcf4f99b
LR
2608 if (err == -ENOMEM)
2609 return err;
2610 /*
2611 * N.B. kobject_uevent_env() can fail mainly for when we're out
2612 * memory which is handled and propagated appropriately above
2613 * but it can also fail during a netlink_broadcast() or during
2614 * early boot for call_usermodehelper(). For now treat these
2615 * errors as non-fatal.
2616 */
e9c0268f 2617 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
bcf4f99b 2618 }
734366de 2619
ae9e4b0d
LR
2620 /*
2621 * Finally, if the user set the module parameter treat it
2622 * as a user hint.
2623 */
2624 if (!is_world_regdom(ieee80211_regdom))
57b5ce07
LR
2625 regulatory_hint_user(ieee80211_regdom,
2626 NL80211_USER_REG_HINT_USER);
ae9e4b0d 2627
b2e1b302
LR
2628 return 0;
2629}
2630
1a919318 2631void regulatory_exit(void)
b2e1b302 2632{
fe33eb39 2633 struct regulatory_request *reg_request, *tmp;
e38f8a7a 2634 struct reg_beacon *reg_beacon, *btmp;
fe33eb39
LR
2635
2636 cancel_work_sync(&reg_work);
a90c7a31 2637 cancel_delayed_work_sync(&reg_timeout);
fe33eb39 2638
9027b149 2639 /* Lock to suppress warnings */
38fd2143 2640 rtnl_lock();
379b82f4 2641 reset_regdomains(true, NULL);
38fd2143 2642 rtnl_unlock();
734366de 2643
58ebacc6 2644 dev_set_uevent_suppress(&reg_pdev->dev, true);
f6037d09 2645
b2e1b302 2646 platform_device_unregister(reg_pdev);
734366de 2647
fea9bced
JB
2648 list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
2649 list_del(&reg_beacon->list);
2650 kfree(reg_beacon);
e38f8a7a 2651 }
e38f8a7a 2652
fea9bced
JB
2653 list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
2654 list_del(&reg_beacon->list);
2655 kfree(reg_beacon);
e38f8a7a
LR
2656 }
2657
fea9bced
JB
2658 list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
2659 list_del(&reg_request->list);
2660 kfree(reg_request);
fe33eb39 2661 }
8318d78a 2662}