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1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 *
8 * Permission to use, copy, modify, and/or distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20
21
22/**
23 * DOC: Wireless regulatory infrastructure
24 *
25 * The usual implementation is for a driver to read a device EEPROM to
26 * determine which regulatory domain it should be operating under, then
27 * looking up the allowable channels in a driver-local table and finally
28 * registering those channels in the wiphy structure.
29 *
30 * Another set of compliance enforcement is for drivers to use their
31 * own compliance limits which can be stored on the EEPROM. The host
32 * driver or firmware may ensure these are used.
33 *
34 * In addition to all this we provide an extra layer of regulatory
35 * conformance. For drivers which do not have any regulatory
36 * information CRDA provides the complete regulatory solution.
37 * For others it provides a community effort on further restrictions
38 * to enhance compliance.
39 *
40 * Note: When number of rules --> infinity we will not be able to
41 * index on alpha2 any more, instead we'll probably have to
42 * rely on some SHA1 checksum of the regdomain for example.
43 *
44 */
45
46#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
47
48#include <linux/kernel.h>
49#include <linux/export.h>
50#include <linux/slab.h>
51#include <linux/list.h>
52#include <linux/ctype.h>
53#include <linux/nl80211.h>
54#include <linux/platform_device.h>
55#include <linux/moduleparam.h>
56#include <net/cfg80211.h>
57#include "core.h"
58#include "reg.h"
59#include "rdev-ops.h"
60#include "regdb.h"
61#include "nl80211.h"
62
63/*
64 * Grace period we give before making sure all current interfaces reside on
65 * channels allowed by the current regulatory domain.
66 */
67#define REG_ENFORCE_GRACE_MS 60000
68
69/**
70 * enum reg_request_treatment - regulatory request treatment
71 *
72 * @REG_REQ_OK: continue processing the regulatory request
73 * @REG_REQ_IGNORE: ignore the regulatory request
74 * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should
75 * be intersected with the current one.
76 * @REG_REQ_ALREADY_SET: the regulatory request will not change the current
77 * regulatory settings, and no further processing is required.
78 */
79enum reg_request_treatment {
80 REG_REQ_OK,
81 REG_REQ_IGNORE,
82 REG_REQ_INTERSECT,
83 REG_REQ_ALREADY_SET,
84};
85
86static struct regulatory_request core_request_world = {
87 .initiator = NL80211_REGDOM_SET_BY_CORE,
88 .alpha2[0] = '0',
89 .alpha2[1] = '0',
90 .intersect = false,
91 .processed = true,
92 .country_ie_env = ENVIRON_ANY,
93};
94
95/*
96 * Receipt of information from last regulatory request,
97 * protected by RTNL (and can be accessed with RCU protection)
98 */
99static struct regulatory_request __rcu *last_request =
100 (void __force __rcu *)&core_request_world;
101
102/* To trigger userspace events */
103static struct platform_device *reg_pdev;
104
105/*
106 * Central wireless core regulatory domains, we only need two,
107 * the current one and a world regulatory domain in case we have no
108 * information to give us an alpha2.
109 * (protected by RTNL, can be read under RCU)
110 */
111const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
112
113/*
114 * Number of devices that registered to the core
115 * that support cellular base station regulatory hints
116 * (protected by RTNL)
117 */
118static int reg_num_devs_support_basehint;
119
120/*
121 * State variable indicating if the platform on which the devices
122 * are attached is operating in an indoor environment. The state variable
123 * is relevant for all registered devices.
124 */
125static bool reg_is_indoor;
126static spinlock_t reg_indoor_lock;
127
128/* Used to track the userspace process controlling the indoor setting */
129static u32 reg_is_indoor_portid;
130
131static void restore_regulatory_settings(bool reset_user);
132
133static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
134{
135 return rtnl_dereference(cfg80211_regdomain);
136}
137
138const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
139{
140 return rtnl_dereference(wiphy->regd);
141}
142
143static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region)
144{
145 switch (dfs_region) {
146 case NL80211_DFS_UNSET:
147 return "unset";
148 case NL80211_DFS_FCC:
149 return "FCC";
150 case NL80211_DFS_ETSI:
151 return "ETSI";
152 case NL80211_DFS_JP:
153 return "JP";
154 }
155 return "Unknown";
156}
157
158enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy)
159{
160 const struct ieee80211_regdomain *regd = NULL;
161 const struct ieee80211_regdomain *wiphy_regd = NULL;
162
163 regd = get_cfg80211_regdom();
164 if (!wiphy)
165 goto out;
166
167 wiphy_regd = get_wiphy_regdom(wiphy);
168 if (!wiphy_regd)
169 goto out;
170
171 if (wiphy_regd->dfs_region == regd->dfs_region)
172 goto out;
173
174 pr_debug("%s: device specific dfs_region (%s) disagrees with cfg80211's central dfs_region (%s)\n",
175 dev_name(&wiphy->dev),
176 reg_dfs_region_str(wiphy_regd->dfs_region),
177 reg_dfs_region_str(regd->dfs_region));
178
179out:
180 return regd->dfs_region;
181}
182
183static void rcu_free_regdom(const struct ieee80211_regdomain *r)
184{
185 if (!r)
186 return;
187 kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
188}
189
190static struct regulatory_request *get_last_request(void)
191{
192 return rcu_dereference_rtnl(last_request);
193}
194
195/* Used to queue up regulatory hints */
196static LIST_HEAD(reg_requests_list);
197static spinlock_t reg_requests_lock;
198
199/* Used to queue up beacon hints for review */
200static LIST_HEAD(reg_pending_beacons);
201static spinlock_t reg_pending_beacons_lock;
202
203/* Used to keep track of processed beacon hints */
204static LIST_HEAD(reg_beacon_list);
205
206struct reg_beacon {
207 struct list_head list;
208 struct ieee80211_channel chan;
209};
210
211static void reg_check_chans_work(struct work_struct *work);
212static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work);
213
214static void reg_todo(struct work_struct *work);
215static DECLARE_WORK(reg_work, reg_todo);
216
217/* We keep a static world regulatory domain in case of the absence of CRDA */
218static const struct ieee80211_regdomain world_regdom = {
219 .n_reg_rules = 8,
220 .alpha2 = "00",
221 .reg_rules = {
222 /* IEEE 802.11b/g, channels 1..11 */
223 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
224 /* IEEE 802.11b/g, channels 12..13. */
225 REG_RULE(2467-10, 2472+10, 20, 6, 20,
226 NL80211_RRF_NO_IR | NL80211_RRF_AUTO_BW),
227 /* IEEE 802.11 channel 14 - Only JP enables
228 * this and for 802.11b only */
229 REG_RULE(2484-10, 2484+10, 20, 6, 20,
230 NL80211_RRF_NO_IR |
231 NL80211_RRF_NO_OFDM),
232 /* IEEE 802.11a, channel 36..48 */
233 REG_RULE(5180-10, 5240+10, 80, 6, 20,
234 NL80211_RRF_NO_IR |
235 NL80211_RRF_AUTO_BW),
236
237 /* IEEE 802.11a, channel 52..64 - DFS required */
238 REG_RULE(5260-10, 5320+10, 80, 6, 20,
239 NL80211_RRF_NO_IR |
240 NL80211_RRF_AUTO_BW |
241 NL80211_RRF_DFS),
242
243 /* IEEE 802.11a, channel 100..144 - DFS required */
244 REG_RULE(5500-10, 5720+10, 160, 6, 20,
245 NL80211_RRF_NO_IR |
246 NL80211_RRF_DFS),
247
248 /* IEEE 802.11a, channel 149..165 */
249 REG_RULE(5745-10, 5825+10, 80, 6, 20,
250 NL80211_RRF_NO_IR),
251
252 /* IEEE 802.11ad (60GHz), channels 1..3 */
253 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
254 }
255};
256
257/* protected by RTNL */
258static const struct ieee80211_regdomain *cfg80211_world_regdom =
259 &world_regdom;
260
261static char *ieee80211_regdom = "00";
262static char user_alpha2[2];
263
264module_param(ieee80211_regdom, charp, 0444);
265MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
266
267static void reg_free_request(struct regulatory_request *request)
268{
269 if (request == &core_request_world)
270 return;
271
272 if (request != get_last_request())
273 kfree(request);
274}
275
276static void reg_free_last_request(void)
277{
278 struct regulatory_request *lr = get_last_request();
279
280 if (lr != &core_request_world && lr)
281 kfree_rcu(lr, rcu_head);
282}
283
284static void reg_update_last_request(struct regulatory_request *request)
285{
286 struct regulatory_request *lr;
287
288 lr = get_last_request();
289 if (lr == request)
290 return;
291
292 reg_free_last_request();
293 rcu_assign_pointer(last_request, request);
294}
295
296static void reset_regdomains(bool full_reset,
297 const struct ieee80211_regdomain *new_regdom)
298{
299 const struct ieee80211_regdomain *r;
300
301 ASSERT_RTNL();
302
303 r = get_cfg80211_regdom();
304
305 /* avoid freeing static information or freeing something twice */
306 if (r == cfg80211_world_regdom)
307 r = NULL;
308 if (cfg80211_world_regdom == &world_regdom)
309 cfg80211_world_regdom = NULL;
310 if (r == &world_regdom)
311 r = NULL;
312
313 rcu_free_regdom(r);
314 rcu_free_regdom(cfg80211_world_regdom);
315
316 cfg80211_world_regdom = &world_regdom;
317 rcu_assign_pointer(cfg80211_regdomain, new_regdom);
318
319 if (!full_reset)
320 return;
321
322 reg_update_last_request(&core_request_world);
323}
324
325/*
326 * Dynamic world regulatory domain requested by the wireless
327 * core upon initialization
328 */
329static void update_world_regdomain(const struct ieee80211_regdomain *rd)
330{
331 struct regulatory_request *lr;
332
333 lr = get_last_request();
334
335 WARN_ON(!lr);
336
337 reset_regdomains(false, rd);
338
339 cfg80211_world_regdom = rd;
340}
341
342bool is_world_regdom(const char *alpha2)
343{
344 if (!alpha2)
345 return false;
346 return alpha2[0] == '0' && alpha2[1] == '0';
347}
348
349static bool is_alpha2_set(const char *alpha2)
350{
351 if (!alpha2)
352 return false;
353 return alpha2[0] && alpha2[1];
354}
355
356static bool is_unknown_alpha2(const char *alpha2)
357{
358 if (!alpha2)
359 return false;
360 /*
361 * Special case where regulatory domain was built by driver
362 * but a specific alpha2 cannot be determined
363 */
364 return alpha2[0] == '9' && alpha2[1] == '9';
365}
366
367static bool is_intersected_alpha2(const char *alpha2)
368{
369 if (!alpha2)
370 return false;
371 /*
372 * Special case where regulatory domain is the
373 * result of an intersection between two regulatory domain
374 * structures
375 */
376 return alpha2[0] == '9' && alpha2[1] == '8';
377}
378
379static bool is_an_alpha2(const char *alpha2)
380{
381 if (!alpha2)
382 return false;
383 return isalpha(alpha2[0]) && isalpha(alpha2[1]);
384}
385
386static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
387{
388 if (!alpha2_x || !alpha2_y)
389 return false;
390 return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
391}
392
393static bool regdom_changes(const char *alpha2)
394{
395 const struct ieee80211_regdomain *r = get_cfg80211_regdom();
396
397 if (!r)
398 return true;
399 return !alpha2_equal(r->alpha2, alpha2);
400}
401
402/*
403 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
404 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
405 * has ever been issued.
406 */
407static bool is_user_regdom_saved(void)
408{
409 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
410 return false;
411
412 /* This would indicate a mistake on the design */
413 if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
414 "Unexpected user alpha2: %c%c\n",
415 user_alpha2[0], user_alpha2[1]))
416 return false;
417
418 return true;
419}
420
421static const struct ieee80211_regdomain *
422reg_copy_regd(const struct ieee80211_regdomain *src_regd)
423{
424 struct ieee80211_regdomain *regd;
425 int size_of_regd;
426 unsigned int i;
427
428 size_of_regd =
429 sizeof(struct ieee80211_regdomain) +
430 src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
431
432 regd = kzalloc(size_of_regd, GFP_KERNEL);
433 if (!regd)
434 return ERR_PTR(-ENOMEM);
435
436 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
437
438 for (i = 0; i < src_regd->n_reg_rules; i++)
439 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
440 sizeof(struct ieee80211_reg_rule));
441
442 return regd;
443}
444
445#ifdef CONFIG_CFG80211_INTERNAL_REGDB
446struct reg_regdb_apply_request {
447 struct list_head list;
448 const struct ieee80211_regdomain *regdom;
449};
450
451static LIST_HEAD(reg_regdb_apply_list);
452static DEFINE_MUTEX(reg_regdb_apply_mutex);
453
454static void reg_regdb_apply(struct work_struct *work)
455{
456 struct reg_regdb_apply_request *request;
457
458 rtnl_lock();
459
460 mutex_lock(®_regdb_apply_mutex);
461 while (!list_empty(®_regdb_apply_list)) {
462 request = list_first_entry(®_regdb_apply_list,
463 struct reg_regdb_apply_request,
464 list);
465 list_del(&request->list);
466
467 set_regdom(request->regdom, REGD_SOURCE_INTERNAL_DB);
468 kfree(request);
469 }
470 mutex_unlock(®_regdb_apply_mutex);
471
472 rtnl_unlock();
473}
474
475static DECLARE_WORK(reg_regdb_work, reg_regdb_apply);
476
477static int reg_query_builtin(const char *alpha2)
478{
479 const struct ieee80211_regdomain *regdom = NULL;
480 struct reg_regdb_apply_request *request;
481 unsigned int i;
482
483 for (i = 0; i < reg_regdb_size; i++) {
484 if (alpha2_equal(alpha2, reg_regdb[i]->alpha2)) {
485 regdom = reg_regdb[i];
486 break;
487 }
488 }
489
490 if (!regdom)
491 return -ENODATA;
492
493 request = kzalloc(sizeof(struct reg_regdb_apply_request), GFP_KERNEL);
494 if (!request)
495 return -ENOMEM;
496
497 request->regdom = reg_copy_regd(regdom);
498 if (IS_ERR_OR_NULL(request->regdom)) {
499 kfree(request);
500 return -ENOMEM;
501 }
502
503 mutex_lock(®_regdb_apply_mutex);
504 list_add_tail(&request->list, ®_regdb_apply_list);
505 mutex_unlock(®_regdb_apply_mutex);
506
507 schedule_work(®_regdb_work);
508
509 return 0;
510}
511
512/* Feel free to add any other sanity checks here */
513static void reg_regdb_size_check(void)
514{
515 /* We should ideally BUILD_BUG_ON() but then random builds would fail */
516 WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
517}
518#else
519static inline void reg_regdb_size_check(void) {}
520static inline int reg_query_builtin(const char *alpha2)
521{
522 return -ENODATA;
523}
524#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
525
526#ifdef CONFIG_CFG80211_CRDA_SUPPORT
527/* Max number of consecutive attempts to communicate with CRDA */
528#define REG_MAX_CRDA_TIMEOUTS 10
529
530static u32 reg_crda_timeouts;
531
532static void crda_timeout_work(struct work_struct *work);
533static DECLARE_DELAYED_WORK(crda_timeout, crda_timeout_work);
534
535static void crda_timeout_work(struct work_struct *work)
536{
537 pr_debug("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
538 rtnl_lock();
539 reg_crda_timeouts++;
540 restore_regulatory_settings(true);
541 rtnl_unlock();
542}
543
544static void cancel_crda_timeout(void)
545{
546 cancel_delayed_work(&crda_timeout);
547}
548
549static void cancel_crda_timeout_sync(void)
550{
551 cancel_delayed_work_sync(&crda_timeout);
552}
553
554static void reset_crda_timeouts(void)
555{
556 reg_crda_timeouts = 0;
557}
558
559/*
560 * This lets us keep regulatory code which is updated on a regulatory
561 * basis in userspace.
562 */
563static int call_crda(const char *alpha2)
564{
565 char country[12];
566 char *env[] = { country, NULL };
567 int ret;
568
569 snprintf(country, sizeof(country), "COUNTRY=%c%c",
570 alpha2[0], alpha2[1]);
571
572 if (reg_crda_timeouts > REG_MAX_CRDA_TIMEOUTS) {
573 pr_debug("Exceeded CRDA call max attempts. Not calling CRDA\n");
574 return -EINVAL;
575 }
576
577 if (!is_world_regdom((char *) alpha2))
578 pr_debug("Calling CRDA for country: %c%c\n",
579 alpha2[0], alpha2[1]);
580 else
581 pr_debug("Calling CRDA to update world regulatory domain\n");
582
583 ret = kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, env);
584 if (ret)
585 return ret;
586
587 queue_delayed_work(system_power_efficient_wq,
588 &crda_timeout, msecs_to_jiffies(3142));
589 return 0;
590}
591#else
592static inline void cancel_crda_timeout(void) {}
593static inline void cancel_crda_timeout_sync(void) {}
594static inline void reset_crda_timeouts(void) {}
595static inline int call_crda(const char *alpha2)
596{
597 return -ENODATA;
598}
599#endif /* CONFIG_CFG80211_CRDA_SUPPORT */
600
601static bool reg_query_database(struct regulatory_request *request)
602{
603 /* query internal regulatory database (if it exists) */
604 if (reg_query_builtin(request->alpha2) == 0)
605 return true;
606
607 if (call_crda(request->alpha2) == 0)
608 return true;
609
610 return false;
611}
612
613bool reg_is_valid_request(const char *alpha2)
614{
615 struct regulatory_request *lr = get_last_request();
616
617 if (!lr || lr->processed)
618 return false;
619
620 return alpha2_equal(lr->alpha2, alpha2);
621}
622
623static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
624{
625 struct regulatory_request *lr = get_last_request();
626
627 /*
628 * Follow the driver's regulatory domain, if present, unless a country
629 * IE has been processed or a user wants to help complaince further
630 */
631 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
632 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
633 wiphy->regd)
634 return get_wiphy_regdom(wiphy);
635
636 return get_cfg80211_regdom();
637}
638
639static unsigned int
640reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd,
641 const struct ieee80211_reg_rule *rule)
642{
643 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
644 const struct ieee80211_freq_range *freq_range_tmp;
645 const struct ieee80211_reg_rule *tmp;
646 u32 start_freq, end_freq, idx, no;
647
648 for (idx = 0; idx < rd->n_reg_rules; idx++)
649 if (rule == &rd->reg_rules[idx])
650 break;
651
652 if (idx == rd->n_reg_rules)
653 return 0;
654
655 /* get start_freq */
656 no = idx;
657
658 while (no) {
659 tmp = &rd->reg_rules[--no];
660 freq_range_tmp = &tmp->freq_range;
661
662 if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
663 break;
664
665 freq_range = freq_range_tmp;
666 }
667
668 start_freq = freq_range->start_freq_khz;
669
670 /* get end_freq */
671 freq_range = &rule->freq_range;
672 no = idx;
673
674 while (no < rd->n_reg_rules - 1) {
675 tmp = &rd->reg_rules[++no];
676 freq_range_tmp = &tmp->freq_range;
677
678 if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
679 break;
680
681 freq_range = freq_range_tmp;
682 }
683
684 end_freq = freq_range->end_freq_khz;
685
686 return end_freq - start_freq;
687}
688
689unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
690 const struct ieee80211_reg_rule *rule)
691{
692 unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule);
693
694 if (rule->flags & NL80211_RRF_NO_160MHZ)
695 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80));
696 if (rule->flags & NL80211_RRF_NO_80MHZ)
697 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40));
698
699 /*
700 * HT40+/HT40- limits are handled per-channel. Only limit BW if both
701 * are not allowed.
702 */
703 if (rule->flags & NL80211_RRF_NO_HT40MINUS &&
704 rule->flags & NL80211_RRF_NO_HT40PLUS)
705 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20));
706
707 return bw;
708}
709
710/* Sanity check on a regulatory rule */
711static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
712{
713 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
714 u32 freq_diff;
715
716 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
717 return false;
718
719 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
720 return false;
721
722 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
723
724 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
725 freq_range->max_bandwidth_khz > freq_diff)
726 return false;
727
728 return true;
729}
730
731static bool is_valid_rd(const struct ieee80211_regdomain *rd)
732{
733 const struct ieee80211_reg_rule *reg_rule = NULL;
734 unsigned int i;
735
736 if (!rd->n_reg_rules)
737 return false;
738
739 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
740 return false;
741
742 for (i = 0; i < rd->n_reg_rules; i++) {
743 reg_rule = &rd->reg_rules[i];
744 if (!is_valid_reg_rule(reg_rule))
745 return false;
746 }
747
748 return true;
749}
750
751static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
752 u32 center_freq_khz, u32 bw_khz)
753{
754 u32 start_freq_khz, end_freq_khz;
755
756 start_freq_khz = center_freq_khz - (bw_khz/2);
757 end_freq_khz = center_freq_khz + (bw_khz/2);
758
759 if (start_freq_khz >= freq_range->start_freq_khz &&
760 end_freq_khz <= freq_range->end_freq_khz)
761 return true;
762
763 return false;
764}
765
766/**
767 * freq_in_rule_band - tells us if a frequency is in a frequency band
768 * @freq_range: frequency rule we want to query
769 * @freq_khz: frequency we are inquiring about
770 *
771 * This lets us know if a specific frequency rule is or is not relevant to
772 * a specific frequency's band. Bands are device specific and artificial
773 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
774 * however it is safe for now to assume that a frequency rule should not be
775 * part of a frequency's band if the start freq or end freq are off by more
776 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
777 * 60 GHz band.
778 * This resolution can be lowered and should be considered as we add
779 * regulatory rule support for other "bands".
780 **/
781static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
782 u32 freq_khz)
783{
784#define ONE_GHZ_IN_KHZ 1000000
785 /*
786 * From 802.11ad: directional multi-gigabit (DMG):
787 * Pertaining to operation in a frequency band containing a channel
788 * with the Channel starting frequency above 45 GHz.
789 */
790 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
791 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
792 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
793 return true;
794 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
795 return true;
796 return false;
797#undef ONE_GHZ_IN_KHZ
798}
799
800/*
801 * Later on we can perhaps use the more restrictive DFS
802 * region but we don't have information for that yet so
803 * for now simply disallow conflicts.
804 */
805static enum nl80211_dfs_regions
806reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
807 const enum nl80211_dfs_regions dfs_region2)
808{
809 if (dfs_region1 != dfs_region2)
810 return NL80211_DFS_UNSET;
811 return dfs_region1;
812}
813
814/*
815 * Helper for regdom_intersect(), this does the real
816 * mathematical intersection fun
817 */
818static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
819 const struct ieee80211_regdomain *rd2,
820 const struct ieee80211_reg_rule *rule1,
821 const struct ieee80211_reg_rule *rule2,
822 struct ieee80211_reg_rule *intersected_rule)
823{
824 const struct ieee80211_freq_range *freq_range1, *freq_range2;
825 struct ieee80211_freq_range *freq_range;
826 const struct ieee80211_power_rule *power_rule1, *power_rule2;
827 struct ieee80211_power_rule *power_rule;
828 u32 freq_diff, max_bandwidth1, max_bandwidth2;
829
830 freq_range1 = &rule1->freq_range;
831 freq_range2 = &rule2->freq_range;
832 freq_range = &intersected_rule->freq_range;
833
834 power_rule1 = &rule1->power_rule;
835 power_rule2 = &rule2->power_rule;
836 power_rule = &intersected_rule->power_rule;
837
838 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
839 freq_range2->start_freq_khz);
840 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
841 freq_range2->end_freq_khz);
842
843 max_bandwidth1 = freq_range1->max_bandwidth_khz;
844 max_bandwidth2 = freq_range2->max_bandwidth_khz;
845
846 if (rule1->flags & NL80211_RRF_AUTO_BW)
847 max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
848 if (rule2->flags & NL80211_RRF_AUTO_BW)
849 max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
850
851 freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
852
853 intersected_rule->flags = rule1->flags | rule2->flags;
854
855 /*
856 * In case NL80211_RRF_AUTO_BW requested for both rules
857 * set AUTO_BW in intersected rule also. Next we will
858 * calculate BW correctly in handle_channel function.
859 * In other case remove AUTO_BW flag while we calculate
860 * maximum bandwidth correctly and auto calculation is
861 * not required.
862 */
863 if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
864 (rule2->flags & NL80211_RRF_AUTO_BW))
865 intersected_rule->flags |= NL80211_RRF_AUTO_BW;
866 else
867 intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
868
869 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
870 if (freq_range->max_bandwidth_khz > freq_diff)
871 freq_range->max_bandwidth_khz = freq_diff;
872
873 power_rule->max_eirp = min(power_rule1->max_eirp,
874 power_rule2->max_eirp);
875 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
876 power_rule2->max_antenna_gain);
877
878 intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms,
879 rule2->dfs_cac_ms);
880
881 if (!is_valid_reg_rule(intersected_rule))
882 return -EINVAL;
883
884 return 0;
885}
886
887/* check whether old rule contains new rule */
888static bool rule_contains(struct ieee80211_reg_rule *r1,
889 struct ieee80211_reg_rule *r2)
890{
891 /* for simplicity, currently consider only same flags */
892 if (r1->flags != r2->flags)
893 return false;
894
895 /* verify r1 is more restrictive */
896 if ((r1->power_rule.max_antenna_gain >
897 r2->power_rule.max_antenna_gain) ||
898 r1->power_rule.max_eirp > r2->power_rule.max_eirp)
899 return false;
900
901 /* make sure r2's range is contained within r1 */
902 if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz ||
903 r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz)
904 return false;
905
906 /* and finally verify that r1.max_bw >= r2.max_bw */
907 if (r1->freq_range.max_bandwidth_khz <
908 r2->freq_range.max_bandwidth_khz)
909 return false;
910
911 return true;
912}
913
914/* add or extend current rules. do nothing if rule is already contained */
915static void add_rule(struct ieee80211_reg_rule *rule,
916 struct ieee80211_reg_rule *reg_rules, u32 *n_rules)
917{
918 struct ieee80211_reg_rule *tmp_rule;
919 int i;
920
921 for (i = 0; i < *n_rules; i++) {
922 tmp_rule = ®_rules[i];
923 /* rule is already contained - do nothing */
924 if (rule_contains(tmp_rule, rule))
925 return;
926
927 /* extend rule if possible */
928 if (rule_contains(rule, tmp_rule)) {
929 memcpy(tmp_rule, rule, sizeof(*rule));
930 return;
931 }
932 }
933
934 memcpy(®_rules[*n_rules], rule, sizeof(*rule));
935 (*n_rules)++;
936}
937
938/**
939 * regdom_intersect - do the intersection between two regulatory domains
940 * @rd1: first regulatory domain
941 * @rd2: second regulatory domain
942 *
943 * Use this function to get the intersection between two regulatory domains.
944 * Once completed we will mark the alpha2 for the rd as intersected, "98",
945 * as no one single alpha2 can represent this regulatory domain.
946 *
947 * Returns a pointer to the regulatory domain structure which will hold the
948 * resulting intersection of rules between rd1 and rd2. We will
949 * kzalloc() this structure for you.
950 */
951static struct ieee80211_regdomain *
952regdom_intersect(const struct ieee80211_regdomain *rd1,
953 const struct ieee80211_regdomain *rd2)
954{
955 int r, size_of_regd;
956 unsigned int x, y;
957 unsigned int num_rules = 0;
958 const struct ieee80211_reg_rule *rule1, *rule2;
959 struct ieee80211_reg_rule intersected_rule;
960 struct ieee80211_regdomain *rd;
961
962 if (!rd1 || !rd2)
963 return NULL;
964
965 /*
966 * First we get a count of the rules we'll need, then we actually
967 * build them. This is to so we can malloc() and free() a
968 * regdomain once. The reason we use reg_rules_intersect() here
969 * is it will return -EINVAL if the rule computed makes no sense.
970 * All rules that do check out OK are valid.
971 */
972
973 for (x = 0; x < rd1->n_reg_rules; x++) {
974 rule1 = &rd1->reg_rules[x];
975 for (y = 0; y < rd2->n_reg_rules; y++) {
976 rule2 = &rd2->reg_rules[y];
977 if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
978 &intersected_rule))
979 num_rules++;
980 }
981 }
982
983 if (!num_rules)
984 return NULL;
985
986 size_of_regd = sizeof(struct ieee80211_regdomain) +
987 num_rules * sizeof(struct ieee80211_reg_rule);
988
989 rd = kzalloc(size_of_regd, GFP_KERNEL);
990 if (!rd)
991 return NULL;
992
993 for (x = 0; x < rd1->n_reg_rules; x++) {
994 rule1 = &rd1->reg_rules[x];
995 for (y = 0; y < rd2->n_reg_rules; y++) {
996 rule2 = &rd2->reg_rules[y];
997 r = reg_rules_intersect(rd1, rd2, rule1, rule2,
998 &intersected_rule);
999 /*
1000 * No need to memset here the intersected rule here as
1001 * we're not using the stack anymore
1002 */
1003 if (r)
1004 continue;
1005
1006 add_rule(&intersected_rule, rd->reg_rules,
1007 &rd->n_reg_rules);
1008 }
1009 }
1010
1011 rd->alpha2[0] = '9';
1012 rd->alpha2[1] = '8';
1013 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
1014 rd2->dfs_region);
1015
1016 return rd;
1017}
1018
1019/*
1020 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
1021 * want to just have the channel structure use these
1022 */
1023static u32 map_regdom_flags(u32 rd_flags)
1024{
1025 u32 channel_flags = 0;
1026 if (rd_flags & NL80211_RRF_NO_IR_ALL)
1027 channel_flags |= IEEE80211_CHAN_NO_IR;
1028 if (rd_flags & NL80211_RRF_DFS)
1029 channel_flags |= IEEE80211_CHAN_RADAR;
1030 if (rd_flags & NL80211_RRF_NO_OFDM)
1031 channel_flags |= IEEE80211_CHAN_NO_OFDM;
1032 if (rd_flags & NL80211_RRF_NO_OUTDOOR)
1033 channel_flags |= IEEE80211_CHAN_INDOOR_ONLY;
1034 if (rd_flags & NL80211_RRF_IR_CONCURRENT)
1035 channel_flags |= IEEE80211_CHAN_IR_CONCURRENT;
1036 if (rd_flags & NL80211_RRF_NO_HT40MINUS)
1037 channel_flags |= IEEE80211_CHAN_NO_HT40MINUS;
1038 if (rd_flags & NL80211_RRF_NO_HT40PLUS)
1039 channel_flags |= IEEE80211_CHAN_NO_HT40PLUS;
1040 if (rd_flags & NL80211_RRF_NO_80MHZ)
1041 channel_flags |= IEEE80211_CHAN_NO_80MHZ;
1042 if (rd_flags & NL80211_RRF_NO_160MHZ)
1043 channel_flags |= IEEE80211_CHAN_NO_160MHZ;
1044 return channel_flags;
1045}
1046
1047static const struct ieee80211_reg_rule *
1048freq_reg_info_regd(u32 center_freq,
1049 const struct ieee80211_regdomain *regd, u32 bw)
1050{
1051 int i;
1052 bool band_rule_found = false;
1053 bool bw_fits = false;
1054
1055 if (!regd)
1056 return ERR_PTR(-EINVAL);
1057
1058 for (i = 0; i < regd->n_reg_rules; i++) {
1059 const struct ieee80211_reg_rule *rr;
1060 const struct ieee80211_freq_range *fr = NULL;
1061
1062 rr = ®d->reg_rules[i];
1063 fr = &rr->freq_range;
1064
1065 /*
1066 * We only need to know if one frequency rule was
1067 * was in center_freq's band, that's enough, so lets
1068 * not overwrite it once found
1069 */
1070 if (!band_rule_found)
1071 band_rule_found = freq_in_rule_band(fr, center_freq);
1072
1073 bw_fits = reg_does_bw_fit(fr, center_freq, bw);
1074
1075 if (band_rule_found && bw_fits)
1076 return rr;
1077 }
1078
1079 if (!band_rule_found)
1080 return ERR_PTR(-ERANGE);
1081
1082 return ERR_PTR(-EINVAL);
1083}
1084
1085static const struct ieee80211_reg_rule *
1086__freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
1087{
1088 const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy);
1089 const struct ieee80211_reg_rule *reg_rule = NULL;
1090 u32 bw;
1091
1092 for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
1093 reg_rule = freq_reg_info_regd(center_freq, regd, bw);
1094 if (!IS_ERR(reg_rule))
1095 return reg_rule;
1096 }
1097
1098 return reg_rule;
1099}
1100
1101const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
1102 u32 center_freq)
1103{
1104 return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(20));
1105}
1106EXPORT_SYMBOL(freq_reg_info);
1107
1108const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
1109{
1110 switch (initiator) {
1111 case NL80211_REGDOM_SET_BY_CORE:
1112 return "core";
1113 case NL80211_REGDOM_SET_BY_USER:
1114 return "user";
1115 case NL80211_REGDOM_SET_BY_DRIVER:
1116 return "driver";
1117 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1118 return "country IE";
1119 default:
1120 WARN_ON(1);
1121 return "bug";
1122 }
1123}
1124EXPORT_SYMBOL(reg_initiator_name);
1125
1126static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd,
1127 const struct ieee80211_reg_rule *reg_rule,
1128 const struct ieee80211_channel *chan)
1129{
1130 const struct ieee80211_freq_range *freq_range = NULL;
1131 u32 max_bandwidth_khz, bw_flags = 0;
1132
1133 freq_range = ®_rule->freq_range;
1134
1135 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1136 /* Check if auto calculation requested */
1137 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
1138 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1139
1140 /* If we get a reg_rule we can assume that at least 5Mhz fit */
1141 if (!reg_does_bw_fit(freq_range, MHZ_TO_KHZ(chan->center_freq),
1142 MHZ_TO_KHZ(10)))
1143 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1144 if (!reg_does_bw_fit(freq_range, MHZ_TO_KHZ(chan->center_freq),
1145 MHZ_TO_KHZ(20)))
1146 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1147
1148 if (max_bandwidth_khz < MHZ_TO_KHZ(10))
1149 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1150 if (max_bandwidth_khz < MHZ_TO_KHZ(20))
1151 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1152 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1153 bw_flags |= IEEE80211_CHAN_NO_HT40;
1154 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1155 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1156 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1157 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1158 return bw_flags;
1159}
1160
1161/*
1162 * Note that right now we assume the desired channel bandwidth
1163 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
1164 * per channel, the primary and the extension channel).
1165 */
1166static void handle_channel(struct wiphy *wiphy,
1167 enum nl80211_reg_initiator initiator,
1168 struct ieee80211_channel *chan)
1169{
1170 u32 flags, bw_flags = 0;
1171 const struct ieee80211_reg_rule *reg_rule = NULL;
1172 const struct ieee80211_power_rule *power_rule = NULL;
1173 struct wiphy *request_wiphy = NULL;
1174 struct regulatory_request *lr = get_last_request();
1175 const struct ieee80211_regdomain *regd;
1176
1177 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1178
1179 flags = chan->orig_flags;
1180
1181 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
1182 if (IS_ERR(reg_rule)) {
1183 /*
1184 * We will disable all channels that do not match our
1185 * received regulatory rule unless the hint is coming
1186 * from a Country IE and the Country IE had no information
1187 * about a band. The IEEE 802.11 spec allows for an AP
1188 * to send only a subset of the regulatory rules allowed,
1189 * so an AP in the US that only supports 2.4 GHz may only send
1190 * a country IE with information for the 2.4 GHz band
1191 * while 5 GHz is still supported.
1192 */
1193 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1194 PTR_ERR(reg_rule) == -ERANGE)
1195 return;
1196
1197 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1198 request_wiphy && request_wiphy == wiphy &&
1199 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1200 pr_debug("Disabling freq %d MHz for good\n",
1201 chan->center_freq);
1202 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1203 chan->flags = chan->orig_flags;
1204 } else {
1205 pr_debug("Disabling freq %d MHz\n",
1206 chan->center_freq);
1207 chan->flags |= IEEE80211_CHAN_DISABLED;
1208 }
1209 return;
1210 }
1211
1212 regd = reg_get_regdomain(wiphy);
1213
1214 power_rule = ®_rule->power_rule;
1215 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
1216
1217 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1218 request_wiphy && request_wiphy == wiphy &&
1219 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1220 /*
1221 * This guarantees the driver's requested regulatory domain
1222 * will always be used as a base for further regulatory
1223 * settings
1224 */
1225 chan->flags = chan->orig_flags =
1226 map_regdom_flags(reg_rule->flags) | bw_flags;
1227 chan->max_antenna_gain = chan->orig_mag =
1228 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1229 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
1230 (int) MBM_TO_DBM(power_rule->max_eirp);
1231
1232 if (chan->flags & IEEE80211_CHAN_RADAR) {
1233 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1234 if (reg_rule->dfs_cac_ms)
1235 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1236 }
1237
1238 return;
1239 }
1240
1241 chan->dfs_state = NL80211_DFS_USABLE;
1242 chan->dfs_state_entered = jiffies;
1243
1244 chan->beacon_found = false;
1245 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1246 chan->max_antenna_gain =
1247 min_t(int, chan->orig_mag,
1248 MBI_TO_DBI(power_rule->max_antenna_gain));
1249 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1250
1251 if (chan->flags & IEEE80211_CHAN_RADAR) {
1252 if (reg_rule->dfs_cac_ms)
1253 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1254 else
1255 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1256 }
1257
1258 if (chan->orig_mpwr) {
1259 /*
1260 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1261 * will always follow the passed country IE power settings.
1262 */
1263 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1264 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
1265 chan->max_power = chan->max_reg_power;
1266 else
1267 chan->max_power = min(chan->orig_mpwr,
1268 chan->max_reg_power);
1269 } else
1270 chan->max_power = chan->max_reg_power;
1271}
1272
1273static void handle_band(struct wiphy *wiphy,
1274 enum nl80211_reg_initiator initiator,
1275 struct ieee80211_supported_band *sband)
1276{
1277 unsigned int i;
1278
1279 if (!sband)
1280 return;
1281
1282 for (i = 0; i < sband->n_channels; i++)
1283 handle_channel(wiphy, initiator, &sband->channels[i]);
1284}
1285
1286static bool reg_request_cell_base(struct regulatory_request *request)
1287{
1288 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1289 return false;
1290 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1291}
1292
1293bool reg_last_request_cell_base(void)
1294{
1295 return reg_request_cell_base(get_last_request());
1296}
1297
1298#ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
1299/* Core specific check */
1300static enum reg_request_treatment
1301reg_ignore_cell_hint(struct regulatory_request *pending_request)
1302{
1303 struct regulatory_request *lr = get_last_request();
1304
1305 if (!reg_num_devs_support_basehint)
1306 return REG_REQ_IGNORE;
1307
1308 if (reg_request_cell_base(lr) &&
1309 !regdom_changes(pending_request->alpha2))
1310 return REG_REQ_ALREADY_SET;
1311
1312 return REG_REQ_OK;
1313}
1314
1315/* Device specific check */
1316static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1317{
1318 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1319}
1320#else
1321static enum reg_request_treatment
1322reg_ignore_cell_hint(struct regulatory_request *pending_request)
1323{
1324 return REG_REQ_IGNORE;
1325}
1326
1327static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1328{
1329 return true;
1330}
1331#endif
1332
1333static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1334{
1335 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1336 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1337 return true;
1338 return false;
1339}
1340
1341static bool ignore_reg_update(struct wiphy *wiphy,
1342 enum nl80211_reg_initiator initiator)
1343{
1344 struct regulatory_request *lr = get_last_request();
1345
1346 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
1347 return true;
1348
1349 if (!lr) {
1350 pr_debug("Ignoring regulatory request set by %s since last_request is not set\n",
1351 reg_initiator_name(initiator));
1352 return true;
1353 }
1354
1355 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1356 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1357 pr_debug("Ignoring regulatory request set by %s since the driver uses its own custom regulatory domain\n",
1358 reg_initiator_name(initiator));
1359 return true;
1360 }
1361
1362 /*
1363 * wiphy->regd will be set once the device has its own
1364 * desired regulatory domain set
1365 */
1366 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1367 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1368 !is_world_regdom(lr->alpha2)) {
1369 pr_debug("Ignoring regulatory request set by %s since the driver requires its own regulatory domain to be set first\n",
1370 reg_initiator_name(initiator));
1371 return true;
1372 }
1373
1374 if (reg_request_cell_base(lr))
1375 return reg_dev_ignore_cell_hint(wiphy);
1376
1377 return false;
1378}
1379
1380static bool reg_is_world_roaming(struct wiphy *wiphy)
1381{
1382 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1383 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1384 struct regulatory_request *lr = get_last_request();
1385
1386 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1387 return true;
1388
1389 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1390 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1391 return true;
1392
1393 return false;
1394}
1395
1396static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1397 struct reg_beacon *reg_beacon)
1398{
1399 struct ieee80211_supported_band *sband;
1400 struct ieee80211_channel *chan;
1401 bool channel_changed = false;
1402 struct ieee80211_channel chan_before;
1403
1404 sband = wiphy->bands[reg_beacon->chan.band];
1405 chan = &sband->channels[chan_idx];
1406
1407 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1408 return;
1409
1410 if (chan->beacon_found)
1411 return;
1412
1413 chan->beacon_found = true;
1414
1415 if (!reg_is_world_roaming(wiphy))
1416 return;
1417
1418 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1419 return;
1420
1421 chan_before.center_freq = chan->center_freq;
1422 chan_before.flags = chan->flags;
1423
1424 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1425 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1426 channel_changed = true;
1427 }
1428
1429 if (channel_changed)
1430 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1431}
1432
1433/*
1434 * Called when a scan on a wiphy finds a beacon on
1435 * new channel
1436 */
1437static void wiphy_update_new_beacon(struct wiphy *wiphy,
1438 struct reg_beacon *reg_beacon)
1439{
1440 unsigned int i;
1441 struct ieee80211_supported_band *sband;
1442
1443 if (!wiphy->bands[reg_beacon->chan.band])
1444 return;
1445
1446 sband = wiphy->bands[reg_beacon->chan.band];
1447
1448 for (i = 0; i < sband->n_channels; i++)
1449 handle_reg_beacon(wiphy, i, reg_beacon);
1450}
1451
1452/*
1453 * Called upon reg changes or a new wiphy is added
1454 */
1455static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1456{
1457 unsigned int i;
1458 struct ieee80211_supported_band *sband;
1459 struct reg_beacon *reg_beacon;
1460
1461 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1462 if (!wiphy->bands[reg_beacon->chan.band])
1463 continue;
1464 sband = wiphy->bands[reg_beacon->chan.band];
1465 for (i = 0; i < sband->n_channels; i++)
1466 handle_reg_beacon(wiphy, i, reg_beacon);
1467 }
1468}
1469
1470/* Reap the advantages of previously found beacons */
1471static void reg_process_beacons(struct wiphy *wiphy)
1472{
1473 /*
1474 * Means we are just firing up cfg80211, so no beacons would
1475 * have been processed yet.
1476 */
1477 if (!last_request)
1478 return;
1479 wiphy_update_beacon_reg(wiphy);
1480}
1481
1482static bool is_ht40_allowed(struct ieee80211_channel *chan)
1483{
1484 if (!chan)
1485 return false;
1486 if (chan->flags & IEEE80211_CHAN_DISABLED)
1487 return false;
1488 /* This would happen when regulatory rules disallow HT40 completely */
1489 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
1490 return false;
1491 return true;
1492}
1493
1494static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1495 struct ieee80211_channel *channel)
1496{
1497 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
1498 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1499 unsigned int i;
1500
1501 if (!is_ht40_allowed(channel)) {
1502 channel->flags |= IEEE80211_CHAN_NO_HT40;
1503 return;
1504 }
1505
1506 /*
1507 * We need to ensure the extension channels exist to
1508 * be able to use HT40- or HT40+, this finds them (or not)
1509 */
1510 for (i = 0; i < sband->n_channels; i++) {
1511 struct ieee80211_channel *c = &sband->channels[i];
1512
1513 if (c->center_freq == (channel->center_freq - 20))
1514 channel_before = c;
1515 if (c->center_freq == (channel->center_freq + 20))
1516 channel_after = c;
1517 }
1518
1519 /*
1520 * Please note that this assumes target bandwidth is 20 MHz,
1521 * if that ever changes we also need to change the below logic
1522 * to include that as well.
1523 */
1524 if (!is_ht40_allowed(channel_before))
1525 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1526 else
1527 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1528
1529 if (!is_ht40_allowed(channel_after))
1530 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1531 else
1532 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1533}
1534
1535static void reg_process_ht_flags_band(struct wiphy *wiphy,
1536 struct ieee80211_supported_band *sband)
1537{
1538 unsigned int i;
1539
1540 if (!sband)
1541 return;
1542
1543 for (i = 0; i < sband->n_channels; i++)
1544 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
1545}
1546
1547static void reg_process_ht_flags(struct wiphy *wiphy)
1548{
1549 enum ieee80211_band band;
1550
1551 if (!wiphy)
1552 return;
1553
1554 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1555 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
1556}
1557
1558static void reg_call_notifier(struct wiphy *wiphy,
1559 struct regulatory_request *request)
1560{
1561 if (wiphy->reg_notifier)
1562 wiphy->reg_notifier(wiphy, request);
1563}
1564
1565static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
1566{
1567 struct cfg80211_chan_def chandef;
1568 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1569 enum nl80211_iftype iftype;
1570
1571 wdev_lock(wdev);
1572 iftype = wdev->iftype;
1573
1574 /* make sure the interface is active */
1575 if (!wdev->netdev || !netif_running(wdev->netdev))
1576 goto wdev_inactive_unlock;
1577
1578 switch (iftype) {
1579 case NL80211_IFTYPE_AP:
1580 case NL80211_IFTYPE_P2P_GO:
1581 if (!wdev->beacon_interval)
1582 goto wdev_inactive_unlock;
1583 chandef = wdev->chandef;
1584 break;
1585 case NL80211_IFTYPE_ADHOC:
1586 if (!wdev->ssid_len)
1587 goto wdev_inactive_unlock;
1588 chandef = wdev->chandef;
1589 break;
1590 case NL80211_IFTYPE_STATION:
1591 case NL80211_IFTYPE_P2P_CLIENT:
1592 if (!wdev->current_bss ||
1593 !wdev->current_bss->pub.channel)
1594 goto wdev_inactive_unlock;
1595
1596 if (!rdev->ops->get_channel ||
1597 rdev_get_channel(rdev, wdev, &chandef))
1598 cfg80211_chandef_create(&chandef,
1599 wdev->current_bss->pub.channel,
1600 NL80211_CHAN_NO_HT);
1601 break;
1602 case NL80211_IFTYPE_MONITOR:
1603 case NL80211_IFTYPE_AP_VLAN:
1604 case NL80211_IFTYPE_P2P_DEVICE:
1605 /* no enforcement required */
1606 break;
1607 default:
1608 /* others not implemented for now */
1609 WARN_ON(1);
1610 break;
1611 }
1612
1613 wdev_unlock(wdev);
1614
1615 switch (iftype) {
1616 case NL80211_IFTYPE_AP:
1617 case NL80211_IFTYPE_P2P_GO:
1618 case NL80211_IFTYPE_ADHOC:
1619 return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
1620 case NL80211_IFTYPE_STATION:
1621 case NL80211_IFTYPE_P2P_CLIENT:
1622 return cfg80211_chandef_usable(wiphy, &chandef,
1623 IEEE80211_CHAN_DISABLED);
1624 default:
1625 break;
1626 }
1627
1628 return true;
1629
1630wdev_inactive_unlock:
1631 wdev_unlock(wdev);
1632 return true;
1633}
1634
1635static void reg_leave_invalid_chans(struct wiphy *wiphy)
1636{
1637 struct wireless_dev *wdev;
1638 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1639
1640 ASSERT_RTNL();
1641
1642 list_for_each_entry(wdev, &rdev->wdev_list, list)
1643 if (!reg_wdev_chan_valid(wiphy, wdev))
1644 cfg80211_leave(rdev, wdev);
1645}
1646
1647static void reg_check_chans_work(struct work_struct *work)
1648{
1649 struct cfg80211_registered_device *rdev;
1650
1651 pr_debug("Verifying active interfaces after reg change\n");
1652 rtnl_lock();
1653
1654 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1655 if (!(rdev->wiphy.regulatory_flags &
1656 REGULATORY_IGNORE_STALE_KICKOFF))
1657 reg_leave_invalid_chans(&rdev->wiphy);
1658
1659 rtnl_unlock();
1660}
1661
1662static void reg_check_channels(void)
1663{
1664 /*
1665 * Give usermode a chance to do something nicer (move to another
1666 * channel, orderly disconnection), before forcing a disconnection.
1667 */
1668 mod_delayed_work(system_power_efficient_wq,
1669 ®_check_chans,
1670 msecs_to_jiffies(REG_ENFORCE_GRACE_MS));
1671}
1672
1673static void wiphy_update_regulatory(struct wiphy *wiphy,
1674 enum nl80211_reg_initiator initiator)
1675{
1676 enum ieee80211_band band;
1677 struct regulatory_request *lr = get_last_request();
1678
1679 if (ignore_reg_update(wiphy, initiator)) {
1680 /*
1681 * Regulatory updates set by CORE are ignored for custom
1682 * regulatory cards. Let us notify the changes to the driver,
1683 * as some drivers used this to restore its orig_* reg domain.
1684 */
1685 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1686 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1687 reg_call_notifier(wiphy, lr);
1688 return;
1689 }
1690
1691 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
1692
1693 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1694 handle_band(wiphy, initiator, wiphy->bands[band]);
1695
1696 reg_process_beacons(wiphy);
1697 reg_process_ht_flags(wiphy);
1698 reg_call_notifier(wiphy, lr);
1699}
1700
1701static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1702{
1703 struct cfg80211_registered_device *rdev;
1704 struct wiphy *wiphy;
1705
1706 ASSERT_RTNL();
1707
1708 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1709 wiphy = &rdev->wiphy;
1710 wiphy_update_regulatory(wiphy, initiator);
1711 }
1712
1713 reg_check_channels();
1714}
1715
1716static void handle_channel_custom(struct wiphy *wiphy,
1717 struct ieee80211_channel *chan,
1718 const struct ieee80211_regdomain *regd)
1719{
1720 u32 bw_flags = 0;
1721 const struct ieee80211_reg_rule *reg_rule = NULL;
1722 const struct ieee80211_power_rule *power_rule = NULL;
1723 u32 bw;
1724
1725 for (bw = MHZ_TO_KHZ(20); bw >= MHZ_TO_KHZ(5); bw = bw / 2) {
1726 reg_rule = freq_reg_info_regd(MHZ_TO_KHZ(chan->center_freq),
1727 regd, bw);
1728 if (!IS_ERR(reg_rule))
1729 break;
1730 }
1731
1732 if (IS_ERR(reg_rule)) {
1733 pr_debug("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1734 chan->center_freq);
1735 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
1736 chan->flags |= IEEE80211_CHAN_DISABLED;
1737 } else {
1738 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1739 chan->flags = chan->orig_flags;
1740 }
1741 return;
1742 }
1743
1744 power_rule = ®_rule->power_rule;
1745 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
1746
1747 chan->dfs_state_entered = jiffies;
1748 chan->dfs_state = NL80211_DFS_USABLE;
1749
1750 chan->beacon_found = false;
1751
1752 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
1753 chan->flags = chan->orig_flags | bw_flags |
1754 map_regdom_flags(reg_rule->flags);
1755 else
1756 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1757
1758 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1759 chan->max_reg_power = chan->max_power =
1760 (int) MBM_TO_DBM(power_rule->max_eirp);
1761
1762 if (chan->flags & IEEE80211_CHAN_RADAR) {
1763 if (reg_rule->dfs_cac_ms)
1764 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1765 else
1766 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1767 }
1768
1769 chan->max_power = chan->max_reg_power;
1770}
1771
1772static void handle_band_custom(struct wiphy *wiphy,
1773 struct ieee80211_supported_band *sband,
1774 const struct ieee80211_regdomain *regd)
1775{
1776 unsigned int i;
1777
1778 if (!sband)
1779 return;
1780
1781 for (i = 0; i < sband->n_channels; i++)
1782 handle_channel_custom(wiphy, &sband->channels[i], regd);
1783}
1784
1785/* Used by drivers prior to wiphy registration */
1786void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1787 const struct ieee80211_regdomain *regd)
1788{
1789 enum ieee80211_band band;
1790 unsigned int bands_set = 0;
1791
1792 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
1793 "wiphy should have REGULATORY_CUSTOM_REG\n");
1794 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
1795
1796 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1797 if (!wiphy->bands[band])
1798 continue;
1799 handle_band_custom(wiphy, wiphy->bands[band], regd);
1800 bands_set++;
1801 }
1802
1803 /*
1804 * no point in calling this if it won't have any effect
1805 * on your device's supported bands.
1806 */
1807 WARN_ON(!bands_set);
1808}
1809EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1810
1811static void reg_set_request_processed(void)
1812{
1813 bool need_more_processing = false;
1814 struct regulatory_request *lr = get_last_request();
1815
1816 lr->processed = true;
1817
1818 spin_lock(®_requests_lock);
1819 if (!list_empty(®_requests_list))
1820 need_more_processing = true;
1821 spin_unlock(®_requests_lock);
1822
1823 cancel_crda_timeout();
1824
1825 if (need_more_processing)
1826 schedule_work(®_work);
1827}
1828
1829/**
1830 * reg_process_hint_core - process core regulatory requests
1831 * @pending_request: a pending core regulatory request
1832 *
1833 * The wireless subsystem can use this function to process
1834 * a regulatory request issued by the regulatory core.
1835 */
1836static enum reg_request_treatment
1837reg_process_hint_core(struct regulatory_request *core_request)
1838{
1839 if (reg_query_database(core_request)) {
1840 core_request->intersect = false;
1841 core_request->processed = false;
1842 reg_update_last_request(core_request);
1843 return REG_REQ_OK;
1844 }
1845
1846 return REG_REQ_IGNORE;
1847}
1848
1849static enum reg_request_treatment
1850__reg_process_hint_user(struct regulatory_request *user_request)
1851{
1852 struct regulatory_request *lr = get_last_request();
1853
1854 if (reg_request_cell_base(user_request))
1855 return reg_ignore_cell_hint(user_request);
1856
1857 if (reg_request_cell_base(lr))
1858 return REG_REQ_IGNORE;
1859
1860 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1861 return REG_REQ_INTERSECT;
1862 /*
1863 * If the user knows better the user should set the regdom
1864 * to their country before the IE is picked up
1865 */
1866 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
1867 lr->intersect)
1868 return REG_REQ_IGNORE;
1869 /*
1870 * Process user requests only after previous user/driver/core
1871 * requests have been processed
1872 */
1873 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
1874 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1875 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
1876 regdom_changes(lr->alpha2))
1877 return REG_REQ_IGNORE;
1878
1879 if (!regdom_changes(user_request->alpha2))
1880 return REG_REQ_ALREADY_SET;
1881
1882 return REG_REQ_OK;
1883}
1884
1885/**
1886 * reg_process_hint_user - process user regulatory requests
1887 * @user_request: a pending user regulatory request
1888 *
1889 * The wireless subsystem can use this function to process
1890 * a regulatory request initiated by userspace.
1891 */
1892static enum reg_request_treatment
1893reg_process_hint_user(struct regulatory_request *user_request)
1894{
1895 enum reg_request_treatment treatment;
1896
1897 treatment = __reg_process_hint_user(user_request);
1898 if (treatment == REG_REQ_IGNORE ||
1899 treatment == REG_REQ_ALREADY_SET)
1900 return REG_REQ_IGNORE;
1901
1902 user_request->intersect = treatment == REG_REQ_INTERSECT;
1903 user_request->processed = false;
1904
1905 if (reg_query_database(user_request)) {
1906 reg_update_last_request(user_request);
1907 user_alpha2[0] = user_request->alpha2[0];
1908 user_alpha2[1] = user_request->alpha2[1];
1909 return REG_REQ_OK;
1910 }
1911
1912 return REG_REQ_IGNORE;
1913}
1914
1915static enum reg_request_treatment
1916__reg_process_hint_driver(struct regulatory_request *driver_request)
1917{
1918 struct regulatory_request *lr = get_last_request();
1919
1920 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
1921 if (regdom_changes(driver_request->alpha2))
1922 return REG_REQ_OK;
1923 return REG_REQ_ALREADY_SET;
1924 }
1925
1926 /*
1927 * This would happen if you unplug and plug your card
1928 * back in or if you add a new device for which the previously
1929 * loaded card also agrees on the regulatory domain.
1930 */
1931 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1932 !regdom_changes(driver_request->alpha2))
1933 return REG_REQ_ALREADY_SET;
1934
1935 return REG_REQ_INTERSECT;
1936}
1937
1938/**
1939 * reg_process_hint_driver - process driver regulatory requests
1940 * @driver_request: a pending driver regulatory request
1941 *
1942 * The wireless subsystem can use this function to process
1943 * a regulatory request issued by an 802.11 driver.
1944 *
1945 * Returns one of the different reg request treatment values.
1946 */
1947static enum reg_request_treatment
1948reg_process_hint_driver(struct wiphy *wiphy,
1949 struct regulatory_request *driver_request)
1950{
1951 const struct ieee80211_regdomain *regd, *tmp;
1952 enum reg_request_treatment treatment;
1953
1954 treatment = __reg_process_hint_driver(driver_request);
1955
1956 switch (treatment) {
1957 case REG_REQ_OK:
1958 break;
1959 case REG_REQ_IGNORE:
1960 return REG_REQ_IGNORE;
1961 case REG_REQ_INTERSECT:
1962 case REG_REQ_ALREADY_SET:
1963 regd = reg_copy_regd(get_cfg80211_regdom());
1964 if (IS_ERR(regd))
1965 return REG_REQ_IGNORE;
1966
1967 tmp = get_wiphy_regdom(wiphy);
1968 rcu_assign_pointer(wiphy->regd, regd);
1969 rcu_free_regdom(tmp);
1970 }
1971
1972
1973 driver_request->intersect = treatment == REG_REQ_INTERSECT;
1974 driver_request->processed = false;
1975
1976 /*
1977 * Since CRDA will not be called in this case as we already
1978 * have applied the requested regulatory domain before we just
1979 * inform userspace we have processed the request
1980 */
1981 if (treatment == REG_REQ_ALREADY_SET) {
1982 nl80211_send_reg_change_event(driver_request);
1983 reg_update_last_request(driver_request);
1984 reg_set_request_processed();
1985 return REG_REQ_ALREADY_SET;
1986 }
1987
1988 if (reg_query_database(driver_request)) {
1989 reg_update_last_request(driver_request);
1990 return REG_REQ_OK;
1991 }
1992
1993 return REG_REQ_IGNORE;
1994}
1995
1996static enum reg_request_treatment
1997__reg_process_hint_country_ie(struct wiphy *wiphy,
1998 struct regulatory_request *country_ie_request)
1999{
2000 struct wiphy *last_wiphy = NULL;
2001 struct regulatory_request *lr = get_last_request();
2002
2003 if (reg_request_cell_base(lr)) {
2004 /* Trust a Cell base station over the AP's country IE */
2005 if (regdom_changes(country_ie_request->alpha2))
2006 return REG_REQ_IGNORE;
2007 return REG_REQ_ALREADY_SET;
2008 } else {
2009 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
2010 return REG_REQ_IGNORE;
2011 }
2012
2013 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
2014 return -EINVAL;
2015
2016 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
2017 return REG_REQ_OK;
2018
2019 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2020
2021 if (last_wiphy != wiphy) {
2022 /*
2023 * Two cards with two APs claiming different
2024 * Country IE alpha2s. We could
2025 * intersect them, but that seems unlikely
2026 * to be correct. Reject second one for now.
2027 */
2028 if (regdom_changes(country_ie_request->alpha2))
2029 return REG_REQ_IGNORE;
2030 return REG_REQ_ALREADY_SET;
2031 }
2032
2033 if (regdom_changes(country_ie_request->alpha2))
2034 return REG_REQ_OK;
2035 return REG_REQ_ALREADY_SET;
2036}
2037
2038/**
2039 * reg_process_hint_country_ie - process regulatory requests from country IEs
2040 * @country_ie_request: a regulatory request from a country IE
2041 *
2042 * The wireless subsystem can use this function to process
2043 * a regulatory request issued by a country Information Element.
2044 *
2045 * Returns one of the different reg request treatment values.
2046 */
2047static enum reg_request_treatment
2048reg_process_hint_country_ie(struct wiphy *wiphy,
2049 struct regulatory_request *country_ie_request)
2050{
2051 enum reg_request_treatment treatment;
2052
2053 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
2054
2055 switch (treatment) {
2056 case REG_REQ_OK:
2057 break;
2058 case REG_REQ_IGNORE:
2059 return REG_REQ_IGNORE;
2060 case REG_REQ_ALREADY_SET:
2061 reg_free_request(country_ie_request);
2062 return REG_REQ_ALREADY_SET;
2063 case REG_REQ_INTERSECT:
2064 /*
2065 * This doesn't happen yet, not sure we
2066 * ever want to support it for this case.
2067 */
2068 WARN_ONCE(1, "Unexpected intersection for country IEs");
2069 return REG_REQ_IGNORE;
2070 }
2071
2072 country_ie_request->intersect = false;
2073 country_ie_request->processed = false;
2074
2075 if (reg_query_database(country_ie_request)) {
2076 reg_update_last_request(country_ie_request);
2077 return REG_REQ_OK;
2078 }
2079
2080 return REG_REQ_IGNORE;
2081}
2082
2083/* This processes *all* regulatory hints */
2084static void reg_process_hint(struct regulatory_request *reg_request)
2085{
2086 struct wiphy *wiphy = NULL;
2087 enum reg_request_treatment treatment;
2088
2089 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
2090 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
2091
2092 switch (reg_request->initiator) {
2093 case NL80211_REGDOM_SET_BY_CORE:
2094 treatment = reg_process_hint_core(reg_request);
2095 break;
2096 case NL80211_REGDOM_SET_BY_USER:
2097 treatment = reg_process_hint_user(reg_request);
2098 break;
2099 case NL80211_REGDOM_SET_BY_DRIVER:
2100 if (!wiphy)
2101 goto out_free;
2102 treatment = reg_process_hint_driver(wiphy, reg_request);
2103 break;
2104 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2105 if (!wiphy)
2106 goto out_free;
2107 treatment = reg_process_hint_country_ie(wiphy, reg_request);
2108 break;
2109 default:
2110 WARN(1, "invalid initiator %d\n", reg_request->initiator);
2111 goto out_free;
2112 }
2113
2114 if (treatment == REG_REQ_IGNORE)
2115 goto out_free;
2116
2117 WARN(treatment != REG_REQ_OK && treatment != REG_REQ_ALREADY_SET,
2118 "unexpected treatment value %d\n", treatment);
2119
2120 /* This is required so that the orig_* parameters are saved.
2121 * NOTE: treatment must be set for any case that reaches here!
2122 */
2123 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
2124 wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
2125 wiphy_update_regulatory(wiphy, reg_request->initiator);
2126 reg_check_channels();
2127 }
2128
2129 return;
2130
2131out_free:
2132 reg_free_request(reg_request);
2133}
2134
2135static bool reg_only_self_managed_wiphys(void)
2136{
2137 struct cfg80211_registered_device *rdev;
2138 struct wiphy *wiphy;
2139 bool self_managed_found = false;
2140
2141 ASSERT_RTNL();
2142
2143 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2144 wiphy = &rdev->wiphy;
2145 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
2146 self_managed_found = true;
2147 else
2148 return false;
2149 }
2150
2151 /* make sure at least one self-managed wiphy exists */
2152 return self_managed_found;
2153}
2154
2155/*
2156 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
2157 * Regulatory hints come on a first come first serve basis and we
2158 * must process each one atomically.
2159 */
2160static void reg_process_pending_hints(void)
2161{
2162 struct regulatory_request *reg_request, *lr;
2163
2164 lr = get_last_request();
2165
2166 /* When last_request->processed becomes true this will be rescheduled */
2167 if (lr && !lr->processed) {
2168 reg_process_hint(lr);
2169 return;
2170 }
2171
2172 spin_lock(®_requests_lock);
2173
2174 if (list_empty(®_requests_list)) {
2175 spin_unlock(®_requests_lock);
2176 return;
2177 }
2178
2179 reg_request = list_first_entry(®_requests_list,
2180 struct regulatory_request,
2181 list);
2182 list_del_init(®_request->list);
2183
2184 spin_unlock(®_requests_lock);
2185
2186 if (reg_only_self_managed_wiphys()) {
2187 reg_free_request(reg_request);
2188 return;
2189 }
2190
2191 reg_process_hint(reg_request);
2192
2193 lr = get_last_request();
2194
2195 spin_lock(®_requests_lock);
2196 if (!list_empty(®_requests_list) && lr && lr->processed)
2197 schedule_work(®_work);
2198 spin_unlock(®_requests_lock);
2199}
2200
2201/* Processes beacon hints -- this has nothing to do with country IEs */
2202static void reg_process_pending_beacon_hints(void)
2203{
2204 struct cfg80211_registered_device *rdev;
2205 struct reg_beacon *pending_beacon, *tmp;
2206
2207 /* This goes through the _pending_ beacon list */
2208 spin_lock_bh(®_pending_beacons_lock);
2209
2210 list_for_each_entry_safe(pending_beacon, tmp,
2211 ®_pending_beacons, list) {
2212 list_del_init(&pending_beacon->list);
2213
2214 /* Applies the beacon hint to current wiphys */
2215 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
2216 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
2217
2218 /* Remembers the beacon hint for new wiphys or reg changes */
2219 list_add_tail(&pending_beacon->list, ®_beacon_list);
2220 }
2221
2222 spin_unlock_bh(®_pending_beacons_lock);
2223}
2224
2225static void reg_process_self_managed_hints(void)
2226{
2227 struct cfg80211_registered_device *rdev;
2228 struct wiphy *wiphy;
2229 const struct ieee80211_regdomain *tmp;
2230 const struct ieee80211_regdomain *regd;
2231 enum ieee80211_band band;
2232 struct regulatory_request request = {};
2233
2234 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2235 wiphy = &rdev->wiphy;
2236
2237 spin_lock(®_requests_lock);
2238 regd = rdev->requested_regd;
2239 rdev->requested_regd = NULL;
2240 spin_unlock(®_requests_lock);
2241
2242 if (regd == NULL)
2243 continue;
2244
2245 tmp = get_wiphy_regdom(wiphy);
2246 rcu_assign_pointer(wiphy->regd, regd);
2247 rcu_free_regdom(tmp);
2248
2249 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
2250 handle_band_custom(wiphy, wiphy->bands[band], regd);
2251
2252 reg_process_ht_flags(wiphy);
2253
2254 request.wiphy_idx = get_wiphy_idx(wiphy);
2255 request.alpha2[0] = regd->alpha2[0];
2256 request.alpha2[1] = regd->alpha2[1];
2257 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
2258
2259 nl80211_send_wiphy_reg_change_event(&request);
2260 }
2261
2262 reg_check_channels();
2263}
2264
2265static void reg_todo(struct work_struct *work)
2266{
2267 rtnl_lock();
2268 reg_process_pending_hints();
2269 reg_process_pending_beacon_hints();
2270 reg_process_self_managed_hints();
2271 rtnl_unlock();
2272}
2273
2274static void queue_regulatory_request(struct regulatory_request *request)
2275{
2276 request->alpha2[0] = toupper(request->alpha2[0]);
2277 request->alpha2[1] = toupper(request->alpha2[1]);
2278
2279 spin_lock(®_requests_lock);
2280 list_add_tail(&request->list, ®_requests_list);
2281 spin_unlock(®_requests_lock);
2282
2283 schedule_work(®_work);
2284}
2285
2286/*
2287 * Core regulatory hint -- happens during cfg80211_init()
2288 * and when we restore regulatory settings.
2289 */
2290static int regulatory_hint_core(const char *alpha2)
2291{
2292 struct regulatory_request *request;
2293
2294 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2295 if (!request)
2296 return -ENOMEM;
2297
2298 request->alpha2[0] = alpha2[0];
2299 request->alpha2[1] = alpha2[1];
2300 request->initiator = NL80211_REGDOM_SET_BY_CORE;
2301
2302 queue_regulatory_request(request);
2303
2304 return 0;
2305}
2306
2307/* User hints */
2308int regulatory_hint_user(const char *alpha2,
2309 enum nl80211_user_reg_hint_type user_reg_hint_type)
2310{
2311 struct regulatory_request *request;
2312
2313 if (WARN_ON(!alpha2))
2314 return -EINVAL;
2315
2316 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2317 if (!request)
2318 return -ENOMEM;
2319
2320 request->wiphy_idx = WIPHY_IDX_INVALID;
2321 request->alpha2[0] = alpha2[0];
2322 request->alpha2[1] = alpha2[1];
2323 request->initiator = NL80211_REGDOM_SET_BY_USER;
2324 request->user_reg_hint_type = user_reg_hint_type;
2325
2326 /* Allow calling CRDA again */
2327 reset_crda_timeouts();
2328
2329 queue_regulatory_request(request);
2330
2331 return 0;
2332}
2333
2334int regulatory_hint_indoor(bool is_indoor, u32 portid)
2335{
2336 spin_lock(®_indoor_lock);
2337
2338 /* It is possible that more than one user space process is trying to
2339 * configure the indoor setting. To handle such cases, clear the indoor
2340 * setting in case that some process does not think that the device
2341 * is operating in an indoor environment. In addition, if a user space
2342 * process indicates that it is controlling the indoor setting, save its
2343 * portid, i.e., make it the owner.
2344 */
2345 reg_is_indoor = is_indoor;
2346 if (reg_is_indoor) {
2347 if (!reg_is_indoor_portid)
2348 reg_is_indoor_portid = portid;
2349 } else {
2350 reg_is_indoor_portid = 0;
2351 }
2352
2353 spin_unlock(®_indoor_lock);
2354
2355 if (!is_indoor)
2356 reg_check_channels();
2357
2358 return 0;
2359}
2360
2361void regulatory_netlink_notify(u32 portid)
2362{
2363 spin_lock(®_indoor_lock);
2364
2365 if (reg_is_indoor_portid != portid) {
2366 spin_unlock(®_indoor_lock);
2367 return;
2368 }
2369
2370 reg_is_indoor = false;
2371 reg_is_indoor_portid = 0;
2372
2373 spin_unlock(®_indoor_lock);
2374
2375 reg_check_channels();
2376}
2377
2378/* Driver hints */
2379int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
2380{
2381 struct regulatory_request *request;
2382
2383 if (WARN_ON(!alpha2 || !wiphy))
2384 return -EINVAL;
2385
2386 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
2387
2388 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2389 if (!request)
2390 return -ENOMEM;
2391
2392 request->wiphy_idx = get_wiphy_idx(wiphy);
2393
2394 request->alpha2[0] = alpha2[0];
2395 request->alpha2[1] = alpha2[1];
2396 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
2397
2398 /* Allow calling CRDA again */
2399 reset_crda_timeouts();
2400
2401 queue_regulatory_request(request);
2402
2403 return 0;
2404}
2405EXPORT_SYMBOL(regulatory_hint);
2406
2407void regulatory_hint_country_ie(struct wiphy *wiphy, enum ieee80211_band band,
2408 const u8 *country_ie, u8 country_ie_len)
2409{
2410 char alpha2[2];
2411 enum environment_cap env = ENVIRON_ANY;
2412 struct regulatory_request *request = NULL, *lr;
2413
2414 /* IE len must be evenly divisible by 2 */
2415 if (country_ie_len & 0x01)
2416 return;
2417
2418 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
2419 return;
2420
2421 request = kzalloc(sizeof(*request), GFP_KERNEL);
2422 if (!request)
2423 return;
2424
2425 alpha2[0] = country_ie[0];
2426 alpha2[1] = country_ie[1];
2427
2428 if (country_ie[2] == 'I')
2429 env = ENVIRON_INDOOR;
2430 else if (country_ie[2] == 'O')
2431 env = ENVIRON_OUTDOOR;
2432
2433 rcu_read_lock();
2434 lr = get_last_request();
2435
2436 if (unlikely(!lr))
2437 goto out;
2438
2439 /*
2440 * We will run this only upon a successful connection on cfg80211.
2441 * We leave conflict resolution to the workqueue, where can hold
2442 * the RTNL.
2443 */
2444 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
2445 lr->wiphy_idx != WIPHY_IDX_INVALID)
2446 goto out;
2447
2448 request->wiphy_idx = get_wiphy_idx(wiphy);
2449 request->alpha2[0] = alpha2[0];
2450 request->alpha2[1] = alpha2[1];
2451 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
2452 request->country_ie_env = env;
2453
2454 /* Allow calling CRDA again */
2455 reset_crda_timeouts();
2456
2457 queue_regulatory_request(request);
2458 request = NULL;
2459out:
2460 kfree(request);
2461 rcu_read_unlock();
2462}
2463
2464static void restore_alpha2(char *alpha2, bool reset_user)
2465{
2466 /* indicates there is no alpha2 to consider for restoration */
2467 alpha2[0] = '9';
2468 alpha2[1] = '7';
2469
2470 /* The user setting has precedence over the module parameter */
2471 if (is_user_regdom_saved()) {
2472 /* Unless we're asked to ignore it and reset it */
2473 if (reset_user) {
2474 pr_debug("Restoring regulatory settings including user preference\n");
2475 user_alpha2[0] = '9';
2476 user_alpha2[1] = '7';
2477
2478 /*
2479 * If we're ignoring user settings, we still need to
2480 * check the module parameter to ensure we put things
2481 * back as they were for a full restore.
2482 */
2483 if (!is_world_regdom(ieee80211_regdom)) {
2484 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2485 ieee80211_regdom[0], ieee80211_regdom[1]);
2486 alpha2[0] = ieee80211_regdom[0];
2487 alpha2[1] = ieee80211_regdom[1];
2488 }
2489 } else {
2490 pr_debug("Restoring regulatory settings while preserving user preference for: %c%c\n",
2491 user_alpha2[0], user_alpha2[1]);
2492 alpha2[0] = user_alpha2[0];
2493 alpha2[1] = user_alpha2[1];
2494 }
2495 } else if (!is_world_regdom(ieee80211_regdom)) {
2496 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2497 ieee80211_regdom[0], ieee80211_regdom[1]);
2498 alpha2[0] = ieee80211_regdom[0];
2499 alpha2[1] = ieee80211_regdom[1];
2500 } else
2501 pr_debug("Restoring regulatory settings\n");
2502}
2503
2504static void restore_custom_reg_settings(struct wiphy *wiphy)
2505{
2506 struct ieee80211_supported_band *sband;
2507 enum ieee80211_band band;
2508 struct ieee80211_channel *chan;
2509 int i;
2510
2511 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
2512 sband = wiphy->bands[band];
2513 if (!sband)
2514 continue;
2515 for (i = 0; i < sband->n_channels; i++) {
2516 chan = &sband->channels[i];
2517 chan->flags = chan->orig_flags;
2518 chan->max_antenna_gain = chan->orig_mag;
2519 chan->max_power = chan->orig_mpwr;
2520 chan->beacon_found = false;
2521 }
2522 }
2523}
2524
2525/*
2526 * Restoring regulatory settings involves ingoring any
2527 * possibly stale country IE information and user regulatory
2528 * settings if so desired, this includes any beacon hints
2529 * learned as we could have traveled outside to another country
2530 * after disconnection. To restore regulatory settings we do
2531 * exactly what we did at bootup:
2532 *
2533 * - send a core regulatory hint
2534 * - send a user regulatory hint if applicable
2535 *
2536 * Device drivers that send a regulatory hint for a specific country
2537 * keep their own regulatory domain on wiphy->regd so that does does
2538 * not need to be remembered.
2539 */
2540static void restore_regulatory_settings(bool reset_user)
2541{
2542 char alpha2[2];
2543 char world_alpha2[2];
2544 struct reg_beacon *reg_beacon, *btmp;
2545 LIST_HEAD(tmp_reg_req_list);
2546 struct cfg80211_registered_device *rdev;
2547
2548 ASSERT_RTNL();
2549
2550 /*
2551 * Clear the indoor setting in case that it is not controlled by user
2552 * space, as otherwise there is no guarantee that the device is still
2553 * operating in an indoor environment.
2554 */
2555 spin_lock(®_indoor_lock);
2556 if (reg_is_indoor && !reg_is_indoor_portid) {
2557 reg_is_indoor = false;
2558 reg_check_channels();
2559 }
2560 spin_unlock(®_indoor_lock);
2561
2562 reset_regdomains(true, &world_regdom);
2563 restore_alpha2(alpha2, reset_user);
2564
2565 /*
2566 * If there's any pending requests we simply
2567 * stash them to a temporary pending queue and
2568 * add then after we've restored regulatory
2569 * settings.
2570 */
2571 spin_lock(®_requests_lock);
2572 list_splice_tail_init(®_requests_list, &tmp_reg_req_list);
2573 spin_unlock(®_requests_lock);
2574
2575 /* Clear beacon hints */
2576 spin_lock_bh(®_pending_beacons_lock);
2577 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2578 list_del(®_beacon->list);
2579 kfree(reg_beacon);
2580 }
2581 spin_unlock_bh(®_pending_beacons_lock);
2582
2583 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2584 list_del(®_beacon->list);
2585 kfree(reg_beacon);
2586 }
2587
2588 /* First restore to the basic regulatory settings */
2589 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
2590 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
2591
2592 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2593 if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
2594 continue;
2595 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
2596 restore_custom_reg_settings(&rdev->wiphy);
2597 }
2598
2599 regulatory_hint_core(world_alpha2);
2600
2601 /*
2602 * This restores the ieee80211_regdom module parameter
2603 * preference or the last user requested regulatory
2604 * settings, user regulatory settings takes precedence.
2605 */
2606 if (is_an_alpha2(alpha2))
2607 regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER);
2608
2609 spin_lock(®_requests_lock);
2610 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
2611 spin_unlock(®_requests_lock);
2612
2613 pr_debug("Kicking the queue\n");
2614
2615 schedule_work(®_work);
2616}
2617
2618void regulatory_hint_disconnect(void)
2619{
2620 pr_debug("All devices are disconnected, going to restore regulatory settings\n");
2621 restore_regulatory_settings(false);
2622}
2623
2624static bool freq_is_chan_12_13_14(u16 freq)
2625{
2626 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
2627 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
2628 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
2629 return true;
2630 return false;
2631}
2632
2633static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
2634{
2635 struct reg_beacon *pending_beacon;
2636
2637 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
2638 if (beacon_chan->center_freq ==
2639 pending_beacon->chan.center_freq)
2640 return true;
2641 return false;
2642}
2643
2644int regulatory_hint_found_beacon(struct wiphy *wiphy,
2645 struct ieee80211_channel *beacon_chan,
2646 gfp_t gfp)
2647{
2648 struct reg_beacon *reg_beacon;
2649 bool processing;
2650
2651 if (beacon_chan->beacon_found ||
2652 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
2653 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
2654 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
2655 return 0;
2656
2657 spin_lock_bh(®_pending_beacons_lock);
2658 processing = pending_reg_beacon(beacon_chan);
2659 spin_unlock_bh(®_pending_beacons_lock);
2660
2661 if (processing)
2662 return 0;
2663
2664 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
2665 if (!reg_beacon)
2666 return -ENOMEM;
2667
2668 pr_debug("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
2669 beacon_chan->center_freq,
2670 ieee80211_frequency_to_channel(beacon_chan->center_freq),
2671 wiphy_name(wiphy));
2672
2673 memcpy(®_beacon->chan, beacon_chan,
2674 sizeof(struct ieee80211_channel));
2675
2676 /*
2677 * Since we can be called from BH or and non-BH context
2678 * we must use spin_lock_bh()
2679 */
2680 spin_lock_bh(®_pending_beacons_lock);
2681 list_add_tail(®_beacon->list, ®_pending_beacons);
2682 spin_unlock_bh(®_pending_beacons_lock);
2683
2684 schedule_work(®_work);
2685
2686 return 0;
2687}
2688
2689static void print_rd_rules(const struct ieee80211_regdomain *rd)
2690{
2691 unsigned int i;
2692 const struct ieee80211_reg_rule *reg_rule = NULL;
2693 const struct ieee80211_freq_range *freq_range = NULL;
2694 const struct ieee80211_power_rule *power_rule = NULL;
2695 char bw[32], cac_time[32];
2696
2697 pr_debug(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
2698
2699 for (i = 0; i < rd->n_reg_rules; i++) {
2700 reg_rule = &rd->reg_rules[i];
2701 freq_range = ®_rule->freq_range;
2702 power_rule = ®_rule->power_rule;
2703
2704 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
2705 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
2706 freq_range->max_bandwidth_khz,
2707 reg_get_max_bandwidth(rd, reg_rule));
2708 else
2709 snprintf(bw, sizeof(bw), "%d KHz",
2710 freq_range->max_bandwidth_khz);
2711
2712 if (reg_rule->flags & NL80211_RRF_DFS)
2713 scnprintf(cac_time, sizeof(cac_time), "%u s",
2714 reg_rule->dfs_cac_ms/1000);
2715 else
2716 scnprintf(cac_time, sizeof(cac_time), "N/A");
2717
2718
2719 /*
2720 * There may not be documentation for max antenna gain
2721 * in certain regions
2722 */
2723 if (power_rule->max_antenna_gain)
2724 pr_debug(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
2725 freq_range->start_freq_khz,
2726 freq_range->end_freq_khz,
2727 bw,
2728 power_rule->max_antenna_gain,
2729 power_rule->max_eirp,
2730 cac_time);
2731 else
2732 pr_debug(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
2733 freq_range->start_freq_khz,
2734 freq_range->end_freq_khz,
2735 bw,
2736 power_rule->max_eirp,
2737 cac_time);
2738 }
2739}
2740
2741bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
2742{
2743 switch (dfs_region) {
2744 case NL80211_DFS_UNSET:
2745 case NL80211_DFS_FCC:
2746 case NL80211_DFS_ETSI:
2747 case NL80211_DFS_JP:
2748 return true;
2749 default:
2750 pr_debug("Ignoring uknown DFS master region: %d\n", dfs_region);
2751 return false;
2752 }
2753}
2754
2755static void print_regdomain(const struct ieee80211_regdomain *rd)
2756{
2757 struct regulatory_request *lr = get_last_request();
2758
2759 if (is_intersected_alpha2(rd->alpha2)) {
2760 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2761 struct cfg80211_registered_device *rdev;
2762 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
2763 if (rdev) {
2764 pr_debug("Current regulatory domain updated by AP to: %c%c\n",
2765 rdev->country_ie_alpha2[0],
2766 rdev->country_ie_alpha2[1]);
2767 } else
2768 pr_debug("Current regulatory domain intersected:\n");
2769 } else
2770 pr_debug("Current regulatory domain intersected:\n");
2771 } else if (is_world_regdom(rd->alpha2)) {
2772 pr_debug("World regulatory domain updated:\n");
2773 } else {
2774 if (is_unknown_alpha2(rd->alpha2))
2775 pr_debug("Regulatory domain changed to driver built-in settings (unknown country)\n");
2776 else {
2777 if (reg_request_cell_base(lr))
2778 pr_debug("Regulatory domain changed to country: %c%c by Cell Station\n",
2779 rd->alpha2[0], rd->alpha2[1]);
2780 else
2781 pr_debug("Regulatory domain changed to country: %c%c\n",
2782 rd->alpha2[0], rd->alpha2[1]);
2783 }
2784 }
2785
2786 pr_debug(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
2787 print_rd_rules(rd);
2788}
2789
2790static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2791{
2792 pr_debug("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
2793 print_rd_rules(rd);
2794}
2795
2796static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
2797{
2798 if (!is_world_regdom(rd->alpha2))
2799 return -EINVAL;
2800 update_world_regdomain(rd);
2801 return 0;
2802}
2803
2804static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
2805 struct regulatory_request *user_request)
2806{
2807 const struct ieee80211_regdomain *intersected_rd = NULL;
2808
2809 if (!regdom_changes(rd->alpha2))
2810 return -EALREADY;
2811
2812 if (!is_valid_rd(rd)) {
2813 pr_err("Invalid regulatory domain detected: %c%c\n",
2814 rd->alpha2[0], rd->alpha2[1]);
2815 print_regdomain_info(rd);
2816 return -EINVAL;
2817 }
2818
2819 if (!user_request->intersect) {
2820 reset_regdomains(false, rd);
2821 return 0;
2822 }
2823
2824 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2825 if (!intersected_rd)
2826 return -EINVAL;
2827
2828 kfree(rd);
2829 rd = NULL;
2830 reset_regdomains(false, intersected_rd);
2831
2832 return 0;
2833}
2834
2835static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
2836 struct regulatory_request *driver_request)
2837{
2838 const struct ieee80211_regdomain *regd;
2839 const struct ieee80211_regdomain *intersected_rd = NULL;
2840 const struct ieee80211_regdomain *tmp;
2841 struct wiphy *request_wiphy;
2842
2843 if (is_world_regdom(rd->alpha2))
2844 return -EINVAL;
2845
2846 if (!regdom_changes(rd->alpha2))
2847 return -EALREADY;
2848
2849 if (!is_valid_rd(rd)) {
2850 pr_err("Invalid regulatory domain detected: %c%c\n",
2851 rd->alpha2[0], rd->alpha2[1]);
2852 print_regdomain_info(rd);
2853 return -EINVAL;
2854 }
2855
2856 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
2857 if (!request_wiphy)
2858 return -ENODEV;
2859
2860 if (!driver_request->intersect) {
2861 if (request_wiphy->regd)
2862 return -EALREADY;
2863
2864 regd = reg_copy_regd(rd);
2865 if (IS_ERR(regd))
2866 return PTR_ERR(regd);
2867
2868 rcu_assign_pointer(request_wiphy->regd, regd);
2869 reset_regdomains(false, rd);
2870 return 0;
2871 }
2872
2873 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2874 if (!intersected_rd)
2875 return -EINVAL;
2876
2877 /*
2878 * We can trash what CRDA provided now.
2879 * However if a driver requested this specific regulatory
2880 * domain we keep it for its private use
2881 */
2882 tmp = get_wiphy_regdom(request_wiphy);
2883 rcu_assign_pointer(request_wiphy->regd, rd);
2884 rcu_free_regdom(tmp);
2885
2886 rd = NULL;
2887
2888 reset_regdomains(false, intersected_rd);
2889
2890 return 0;
2891}
2892
2893static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
2894 struct regulatory_request *country_ie_request)
2895{
2896 struct wiphy *request_wiphy;
2897
2898 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2899 !is_unknown_alpha2(rd->alpha2))
2900 return -EINVAL;
2901
2902 /*
2903 * Lets only bother proceeding on the same alpha2 if the current
2904 * rd is non static (it means CRDA was present and was used last)
2905 * and the pending request came in from a country IE
2906 */
2907
2908 if (!is_valid_rd(rd)) {
2909 pr_err("Invalid regulatory domain detected: %c%c\n",
2910 rd->alpha2[0], rd->alpha2[1]);
2911 print_regdomain_info(rd);
2912 return -EINVAL;
2913 }
2914
2915 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
2916 if (!request_wiphy)
2917 return -ENODEV;
2918
2919 if (country_ie_request->intersect)
2920 return -EINVAL;
2921
2922 reset_regdomains(false, rd);
2923 return 0;
2924}
2925
2926/*
2927 * Use this call to set the current regulatory domain. Conflicts with
2928 * multiple drivers can be ironed out later. Caller must've already
2929 * kmalloc'd the rd structure.
2930 */
2931int set_regdom(const struct ieee80211_regdomain *rd,
2932 enum ieee80211_regd_source regd_src)
2933{
2934 struct regulatory_request *lr;
2935 bool user_reset = false;
2936 int r;
2937
2938 if (!reg_is_valid_request(rd->alpha2)) {
2939 kfree(rd);
2940 return -EINVAL;
2941 }
2942
2943 if (regd_src == REGD_SOURCE_CRDA)
2944 reset_crda_timeouts();
2945
2946 lr = get_last_request();
2947
2948 /* Note that this doesn't update the wiphys, this is done below */
2949 switch (lr->initiator) {
2950 case NL80211_REGDOM_SET_BY_CORE:
2951 r = reg_set_rd_core(rd);
2952 break;
2953 case NL80211_REGDOM_SET_BY_USER:
2954 r = reg_set_rd_user(rd, lr);
2955 user_reset = true;
2956 break;
2957 case NL80211_REGDOM_SET_BY_DRIVER:
2958 r = reg_set_rd_driver(rd, lr);
2959 break;
2960 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2961 r = reg_set_rd_country_ie(rd, lr);
2962 break;
2963 default:
2964 WARN(1, "invalid initiator %d\n", lr->initiator);
2965 kfree(rd);
2966 return -EINVAL;
2967 }
2968
2969 if (r) {
2970 switch (r) {
2971 case -EALREADY:
2972 reg_set_request_processed();
2973 break;
2974 default:
2975 /* Back to world regulatory in case of errors */
2976 restore_regulatory_settings(user_reset);
2977 }
2978
2979 kfree(rd);
2980 return r;
2981 }
2982
2983 /* This would make this whole thing pointless */
2984 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
2985 return -EINVAL;
2986
2987 /* update all wiphys now with the new established regulatory domain */
2988 update_all_wiphy_regulatory(lr->initiator);
2989
2990 print_regdomain(get_cfg80211_regdom());
2991
2992 nl80211_send_reg_change_event(lr);
2993
2994 reg_set_request_processed();
2995
2996 return 0;
2997}
2998
2999static int __regulatory_set_wiphy_regd(struct wiphy *wiphy,
3000 struct ieee80211_regdomain *rd)
3001{
3002 const struct ieee80211_regdomain *regd;
3003 const struct ieee80211_regdomain *prev_regd;
3004 struct cfg80211_registered_device *rdev;
3005
3006 if (WARN_ON(!wiphy || !rd))
3007 return -EINVAL;
3008
3009 if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED),
3010 "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n"))
3011 return -EPERM;
3012
3013 if (WARN(!is_valid_rd(rd), "Invalid regulatory domain detected\n")) {
3014 print_regdomain_info(rd);
3015 return -EINVAL;
3016 }
3017
3018 regd = reg_copy_regd(rd);
3019 if (IS_ERR(regd))
3020 return PTR_ERR(regd);
3021
3022 rdev = wiphy_to_rdev(wiphy);
3023
3024 spin_lock(®_requests_lock);
3025 prev_regd = rdev->requested_regd;
3026 rdev->requested_regd = regd;
3027 spin_unlock(®_requests_lock);
3028
3029 kfree(prev_regd);
3030 return 0;
3031}
3032
3033int regulatory_set_wiphy_regd(struct wiphy *wiphy,
3034 struct ieee80211_regdomain *rd)
3035{
3036 int ret = __regulatory_set_wiphy_regd(wiphy, rd);
3037
3038 if (ret)
3039 return ret;
3040
3041 schedule_work(®_work);
3042 return 0;
3043}
3044EXPORT_SYMBOL(regulatory_set_wiphy_regd);
3045
3046int regulatory_set_wiphy_regd_sync_rtnl(struct wiphy *wiphy,
3047 struct ieee80211_regdomain *rd)
3048{
3049 int ret;
3050
3051 ASSERT_RTNL();
3052
3053 ret = __regulatory_set_wiphy_regd(wiphy, rd);
3054 if (ret)
3055 return ret;
3056
3057 /* process the request immediately */
3058 reg_process_self_managed_hints();
3059 return 0;
3060}
3061EXPORT_SYMBOL(regulatory_set_wiphy_regd_sync_rtnl);
3062
3063void wiphy_regulatory_register(struct wiphy *wiphy)
3064{
3065 struct regulatory_request *lr;
3066
3067 /* self-managed devices ignore external hints */
3068 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
3069 wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS |
3070 REGULATORY_COUNTRY_IE_IGNORE;
3071
3072 if (!reg_dev_ignore_cell_hint(wiphy))
3073 reg_num_devs_support_basehint++;
3074
3075 lr = get_last_request();
3076 wiphy_update_regulatory(wiphy, lr->initiator);
3077}
3078
3079void wiphy_regulatory_deregister(struct wiphy *wiphy)
3080{
3081 struct wiphy *request_wiphy = NULL;
3082 struct regulatory_request *lr;
3083
3084 lr = get_last_request();
3085
3086 if (!reg_dev_ignore_cell_hint(wiphy))
3087 reg_num_devs_support_basehint--;
3088
3089 rcu_free_regdom(get_wiphy_regdom(wiphy));
3090 RCU_INIT_POINTER(wiphy->regd, NULL);
3091
3092 if (lr)
3093 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
3094
3095 if (!request_wiphy || request_wiphy != wiphy)
3096 return;
3097
3098 lr->wiphy_idx = WIPHY_IDX_INVALID;
3099 lr->country_ie_env = ENVIRON_ANY;
3100}
3101
3102/*
3103 * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for
3104 * UNII band definitions
3105 */
3106int cfg80211_get_unii(int freq)
3107{
3108 /* UNII-1 */
3109 if (freq >= 5150 && freq <= 5250)
3110 return 0;
3111
3112 /* UNII-2A */
3113 if (freq > 5250 && freq <= 5350)
3114 return 1;
3115
3116 /* UNII-2B */
3117 if (freq > 5350 && freq <= 5470)
3118 return 2;
3119
3120 /* UNII-2C */
3121 if (freq > 5470 && freq <= 5725)
3122 return 3;
3123
3124 /* UNII-3 */
3125 if (freq > 5725 && freq <= 5825)
3126 return 4;
3127
3128 return -EINVAL;
3129}
3130
3131bool regulatory_indoor_allowed(void)
3132{
3133 return reg_is_indoor;
3134}
3135
3136int __init regulatory_init(void)
3137{
3138 int err = 0;
3139
3140 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
3141 if (IS_ERR(reg_pdev))
3142 return PTR_ERR(reg_pdev);
3143
3144 spin_lock_init(®_requests_lock);
3145 spin_lock_init(®_pending_beacons_lock);
3146 spin_lock_init(®_indoor_lock);
3147
3148 reg_regdb_size_check();
3149
3150 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
3151
3152 user_alpha2[0] = '9';
3153 user_alpha2[1] = '7';
3154
3155 /* We always try to get an update for the static regdomain */
3156 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
3157 if (err) {
3158 if (err == -ENOMEM) {
3159 platform_device_unregister(reg_pdev);
3160 return err;
3161 }
3162 /*
3163 * N.B. kobject_uevent_env() can fail mainly for when we're out
3164 * memory which is handled and propagated appropriately above
3165 * but it can also fail during a netlink_broadcast() or during
3166 * early boot for call_usermodehelper(). For now treat these
3167 * errors as non-fatal.
3168 */
3169 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
3170 }
3171
3172 /*
3173 * Finally, if the user set the module parameter treat it
3174 * as a user hint.
3175 */
3176 if (!is_world_regdom(ieee80211_regdom))
3177 regulatory_hint_user(ieee80211_regdom,
3178 NL80211_USER_REG_HINT_USER);
3179
3180 return 0;
3181}
3182
3183void regulatory_exit(void)
3184{
3185 struct regulatory_request *reg_request, *tmp;
3186 struct reg_beacon *reg_beacon, *btmp;
3187
3188 cancel_work_sync(®_work);
3189 cancel_crda_timeout_sync();
3190 cancel_delayed_work_sync(®_check_chans);
3191
3192 /* Lock to suppress warnings */
3193 rtnl_lock();
3194 reset_regdomains(true, NULL);
3195 rtnl_unlock();
3196
3197 dev_set_uevent_suppress(®_pdev->dev, true);
3198
3199 platform_device_unregister(reg_pdev);
3200
3201 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
3202 list_del(®_beacon->list);
3203 kfree(reg_beacon);
3204 }
3205
3206 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
3207 list_del(®_beacon->list);
3208 kfree(reg_beacon);
3209 }
3210
3211 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
3212 list_del(®_request->list);
3213 kfree(reg_request);
3214 }
3215}
1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20
21/**
22 * DOC: Wireless regulatory infrastructure
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 *
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 *
43 */
44
45#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46
47#include <linux/kernel.h>
48#include <linux/export.h>
49#include <linux/slab.h>
50#include <linux/list.h>
51#include <linux/ctype.h>
52#include <linux/nl80211.h>
53#include <linux/platform_device.h>
54#include <linux/moduleparam.h>
55#include <net/cfg80211.h>
56#include "core.h"
57#include "reg.h"
58#include "regdb.h"
59#include "nl80211.h"
60
61#ifdef CONFIG_CFG80211_REG_DEBUG
62#define REG_DBG_PRINT(format, args...) \
63 printk(KERN_DEBUG pr_fmt(format), ##args)
64#else
65#define REG_DBG_PRINT(args...)
66#endif
67
68enum reg_request_treatment {
69 REG_REQ_OK,
70 REG_REQ_IGNORE,
71 REG_REQ_INTERSECT,
72 REG_REQ_ALREADY_SET,
73};
74
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
84/*
85 * Receipt of information from last regulatory request,
86 * protected by RTNL (and can be accessed with RCU protection)
87 */
88static struct regulatory_request __rcu *last_request =
89 (void __rcu *)&core_request_world;
90
91/* To trigger userspace events */
92static struct platform_device *reg_pdev;
93
94/*
95 * Central wireless core regulatory domains, we only need two,
96 * the current one and a world regulatory domain in case we have no
97 * information to give us an alpha2.
98 * (protected by RTNL, can be read under RCU)
99 */
100const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
101
102/*
103 * Number of devices that registered to the core
104 * that support cellular base station regulatory hints
105 * (protected by RTNL)
106 */
107static int reg_num_devs_support_basehint;
108
109static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
110{
111 return rtnl_dereference(cfg80211_regdomain);
112}
113
114static const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
115{
116 return rtnl_dereference(wiphy->regd);
117}
118
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
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
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
168static struct regulatory_request *get_last_request(void)
169{
170 return rcu_dereference_rtnl(last_request);
171}
172
173/* Used to queue up regulatory hints */
174static LIST_HEAD(reg_requests_list);
175static spinlock_t reg_requests_lock;
176
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
189static void reg_todo(struct work_struct *work);
190static DECLARE_WORK(reg_work, reg_todo);
191
192static void reg_timeout_work(struct work_struct *work);
193static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
194
195/* We keep a static world regulatory domain in case of the absence of CRDA */
196static const struct ieee80211_regdomain world_regdom = {
197 .n_reg_rules = 6,
198 .alpha2 = "00",
199 .reg_rules = {
200 /* IEEE 802.11b/g, channels 1..11 */
201 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
202 /* IEEE 802.11b/g, channels 12..13. */
203 REG_RULE(2467-10, 2472+10, 40, 6, 20,
204 NL80211_RRF_NO_IR),
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,
208 NL80211_RRF_NO_IR |
209 NL80211_RRF_NO_OFDM),
210 /* IEEE 802.11a, channel 36..48 */
211 REG_RULE(5180-10, 5240+10, 160, 6, 20,
212 NL80211_RRF_NO_IR),
213
214 /* IEEE 802.11a, channel 52..64 - DFS required */
215 REG_RULE(5260-10, 5320+10, 160, 6, 20,
216 NL80211_RRF_NO_IR |
217 NL80211_RRF_DFS),
218
219 /* IEEE 802.11a, channel 100..144 - DFS required */
220 REG_RULE(5500-10, 5720+10, 160, 6, 20,
221 NL80211_RRF_NO_IR |
222 NL80211_RRF_DFS),
223
224 /* IEEE 802.11a, channel 149..165 */
225 REG_RULE(5745-10, 5825+10, 80, 6, 20,
226 NL80211_RRF_NO_IR),
227
228 /* IEEE 802.11ad (60gHz), channels 1..3 */
229 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
230 }
231};
232
233/* protected by RTNL */
234static const struct ieee80211_regdomain *cfg80211_world_regdom =
235 &world_regdom;
236
237static char *ieee80211_regdom = "00";
238static char user_alpha2[2];
239
240module_param(ieee80211_regdom, charp, 0444);
241MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
242
243static void reg_free_request(struct regulatory_request *lr)
244{
245 if (lr != &core_request_world && lr)
246 kfree_rcu(lr, rcu_head);
247}
248
249static void reg_update_last_request(struct regulatory_request *request)
250{
251 struct regulatory_request *lr;
252
253 lr = get_last_request();
254 if (lr == request)
255 return;
256
257 reg_free_request(lr);
258 rcu_assign_pointer(last_request, request);
259}
260
261static void reset_regdomains(bool full_reset,
262 const struct ieee80211_regdomain *new_regdom)
263{
264 const struct ieee80211_regdomain *r;
265
266 ASSERT_RTNL();
267
268 r = get_cfg80211_regdom();
269
270 /* avoid freeing static information or freeing something twice */
271 if (r == cfg80211_world_regdom)
272 r = NULL;
273 if (cfg80211_world_regdom == &world_regdom)
274 cfg80211_world_regdom = NULL;
275 if (r == &world_regdom)
276 r = NULL;
277
278 rcu_free_regdom(r);
279 rcu_free_regdom(cfg80211_world_regdom);
280
281 cfg80211_world_regdom = &world_regdom;
282 rcu_assign_pointer(cfg80211_regdomain, new_regdom);
283
284 if (!full_reset)
285 return;
286
287 reg_update_last_request(&core_request_world);
288}
289
290/*
291 * Dynamic world regulatory domain requested by the wireless
292 * core upon initialization
293 */
294static void update_world_regdomain(const struct ieee80211_regdomain *rd)
295{
296 struct regulatory_request *lr;
297
298 lr = get_last_request();
299
300 WARN_ON(!lr);
301
302 reset_regdomains(false, rd);
303
304 cfg80211_world_regdom = rd;
305}
306
307bool is_world_regdom(const char *alpha2)
308{
309 if (!alpha2)
310 return false;
311 return alpha2[0] == '0' && alpha2[1] == '0';
312}
313
314static bool is_alpha2_set(const char *alpha2)
315{
316 if (!alpha2)
317 return false;
318 return alpha2[0] && alpha2[1];
319}
320
321static bool is_unknown_alpha2(const char *alpha2)
322{
323 if (!alpha2)
324 return false;
325 /*
326 * Special case where regulatory domain was built by driver
327 * but a specific alpha2 cannot be determined
328 */
329 return alpha2[0] == '9' && alpha2[1] == '9';
330}
331
332static bool is_intersected_alpha2(const char *alpha2)
333{
334 if (!alpha2)
335 return false;
336 /*
337 * Special case where regulatory domain is the
338 * result of an intersection between two regulatory domain
339 * structures
340 */
341 return alpha2[0] == '9' && alpha2[1] == '8';
342}
343
344static bool is_an_alpha2(const char *alpha2)
345{
346 if (!alpha2)
347 return false;
348 return isalpha(alpha2[0]) && isalpha(alpha2[1]);
349}
350
351static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
352{
353 if (!alpha2_x || !alpha2_y)
354 return false;
355 return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
356}
357
358static bool regdom_changes(const char *alpha2)
359{
360 const struct ieee80211_regdomain *r = get_cfg80211_regdom();
361
362 if (!r)
363 return true;
364 return !alpha2_equal(r->alpha2, alpha2);
365}
366
367/*
368 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
369 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
370 * has ever been issued.
371 */
372static bool is_user_regdom_saved(void)
373{
374 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
375 return false;
376
377 /* This would indicate a mistake on the design */
378 if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
379 "Unexpected user alpha2: %c%c\n",
380 user_alpha2[0], user_alpha2[1]))
381 return false;
382
383 return true;
384}
385
386static const struct ieee80211_regdomain *
387reg_copy_regd(const struct ieee80211_regdomain *src_regd)
388{
389 struct ieee80211_regdomain *regd;
390 int size_of_regd;
391 unsigned int i;
392
393 size_of_regd =
394 sizeof(struct ieee80211_regdomain) +
395 src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
396
397 regd = kzalloc(size_of_regd, GFP_KERNEL);
398 if (!regd)
399 return ERR_PTR(-ENOMEM);
400
401 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
402
403 for (i = 0; i < src_regd->n_reg_rules; i++)
404 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
405 sizeof(struct ieee80211_reg_rule));
406
407 return regd;
408}
409
410#ifdef CONFIG_CFG80211_INTERNAL_REGDB
411struct reg_regdb_search_request {
412 char alpha2[2];
413 struct list_head list;
414};
415
416static LIST_HEAD(reg_regdb_search_list);
417static DEFINE_MUTEX(reg_regdb_search_mutex);
418
419static void reg_regdb_search(struct work_struct *work)
420{
421 struct reg_regdb_search_request *request;
422 const struct ieee80211_regdomain *curdom, *regdom = NULL;
423 int i;
424
425 rtnl_lock();
426
427 mutex_lock(®_regdb_search_mutex);
428 while (!list_empty(®_regdb_search_list)) {
429 request = list_first_entry(®_regdb_search_list,
430 struct reg_regdb_search_request,
431 list);
432 list_del(&request->list);
433
434 for (i = 0; i < reg_regdb_size; i++) {
435 curdom = reg_regdb[i];
436
437 if (alpha2_equal(request->alpha2, curdom->alpha2)) {
438 regdom = reg_copy_regd(curdom);
439 break;
440 }
441 }
442
443 kfree(request);
444 }
445 mutex_unlock(®_regdb_search_mutex);
446
447 if (!IS_ERR_OR_NULL(regdom))
448 set_regdom(regdom);
449
450 rtnl_unlock();
451}
452
453static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
454
455static void reg_regdb_query(const char *alpha2)
456{
457 struct reg_regdb_search_request *request;
458
459 if (!alpha2)
460 return;
461
462 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
463 if (!request)
464 return;
465
466 memcpy(request->alpha2, alpha2, 2);
467
468 mutex_lock(®_regdb_search_mutex);
469 list_add_tail(&request->list, ®_regdb_search_list);
470 mutex_unlock(®_regdb_search_mutex);
471
472 schedule_work(®_regdb_work);
473}
474
475/* Feel free to add any other sanity checks here */
476static void reg_regdb_size_check(void)
477{
478 /* We should ideally BUILD_BUG_ON() but then random builds would fail */
479 WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
480}
481#else
482static inline void reg_regdb_size_check(void) {}
483static inline void reg_regdb_query(const char *alpha2) {}
484#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
485
486/*
487 * This lets us keep regulatory code which is updated on a regulatory
488 * basis in userspace.
489 */
490static int call_crda(const char *alpha2)
491{
492 char country[12];
493 char *env[] = { country, NULL };
494
495 snprintf(country, sizeof(country), "COUNTRY=%c%c",
496 alpha2[0], alpha2[1]);
497
498 if (!is_world_regdom((char *) alpha2))
499 pr_info("Calling CRDA for country: %c%c\n",
500 alpha2[0], alpha2[1]);
501 else
502 pr_info("Calling CRDA to update world regulatory domain\n");
503
504 /* query internal regulatory database (if it exists) */
505 reg_regdb_query(alpha2);
506
507 return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, env);
508}
509
510static enum reg_request_treatment
511reg_call_crda(struct regulatory_request *request)
512{
513 if (call_crda(request->alpha2))
514 return REG_REQ_IGNORE;
515 return REG_REQ_OK;
516}
517
518bool reg_is_valid_request(const char *alpha2)
519{
520 struct regulatory_request *lr = get_last_request();
521
522 if (!lr || lr->processed)
523 return false;
524
525 return alpha2_equal(lr->alpha2, alpha2);
526}
527
528static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
529{
530 struct regulatory_request *lr = get_last_request();
531
532 /*
533 * Follow the driver's regulatory domain, if present, unless a country
534 * IE has been processed or a user wants to help complaince further
535 */
536 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
537 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
538 wiphy->regd)
539 return get_wiphy_regdom(wiphy);
540
541 return get_cfg80211_regdom();
542}
543
544unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
545 const struct ieee80211_reg_rule *rule)
546{
547 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
548 const struct ieee80211_freq_range *freq_range_tmp;
549 const struct ieee80211_reg_rule *tmp;
550 u32 start_freq, end_freq, idx, no;
551
552 for (idx = 0; idx < rd->n_reg_rules; idx++)
553 if (rule == &rd->reg_rules[idx])
554 break;
555
556 if (idx == rd->n_reg_rules)
557 return 0;
558
559 /* get start_freq */
560 no = idx;
561
562 while (no) {
563 tmp = &rd->reg_rules[--no];
564 freq_range_tmp = &tmp->freq_range;
565
566 if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
567 break;
568
569 freq_range = freq_range_tmp;
570 }
571
572 start_freq = freq_range->start_freq_khz;
573
574 /* get end_freq */
575 freq_range = &rule->freq_range;
576 no = idx;
577
578 while (no < rd->n_reg_rules - 1) {
579 tmp = &rd->reg_rules[++no];
580 freq_range_tmp = &tmp->freq_range;
581
582 if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
583 break;
584
585 freq_range = freq_range_tmp;
586 }
587
588 end_freq = freq_range->end_freq_khz;
589
590 return end_freq - start_freq;
591}
592
593/* Sanity check on a regulatory rule */
594static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
595{
596 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
597 u32 freq_diff;
598
599 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
600 return false;
601
602 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
603 return false;
604
605 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
606
607 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
608 freq_range->max_bandwidth_khz > freq_diff)
609 return false;
610
611 return true;
612}
613
614static bool is_valid_rd(const struct ieee80211_regdomain *rd)
615{
616 const struct ieee80211_reg_rule *reg_rule = NULL;
617 unsigned int i;
618
619 if (!rd->n_reg_rules)
620 return false;
621
622 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
623 return false;
624
625 for (i = 0; i < rd->n_reg_rules; i++) {
626 reg_rule = &rd->reg_rules[i];
627 if (!is_valid_reg_rule(reg_rule))
628 return false;
629 }
630
631 return true;
632}
633
634static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
635 u32 center_freq_khz, u32 bw_khz)
636{
637 u32 start_freq_khz, end_freq_khz;
638
639 start_freq_khz = center_freq_khz - (bw_khz/2);
640 end_freq_khz = center_freq_khz + (bw_khz/2);
641
642 if (start_freq_khz >= freq_range->start_freq_khz &&
643 end_freq_khz <= freq_range->end_freq_khz)
644 return true;
645
646 return false;
647}
648
649/**
650 * freq_in_rule_band - tells us if a frequency is in a frequency band
651 * @freq_range: frequency rule we want to query
652 * @freq_khz: frequency we are inquiring about
653 *
654 * This lets us know if a specific frequency rule is or is not relevant to
655 * a specific frequency's band. Bands are device specific and artificial
656 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
657 * however it is safe for now to assume that a frequency rule should not be
658 * part of a frequency's band if the start freq or end freq are off by more
659 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
660 * 60 GHz band.
661 * This resolution can be lowered and should be considered as we add
662 * regulatory rule support for other "bands".
663 **/
664static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
665 u32 freq_khz)
666{
667#define ONE_GHZ_IN_KHZ 1000000
668 /*
669 * From 802.11ad: directional multi-gigabit (DMG):
670 * Pertaining to operation in a frequency band containing a channel
671 * with the Channel starting frequency above 45 GHz.
672 */
673 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
674 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
675 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
676 return true;
677 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
678 return true;
679 return false;
680#undef ONE_GHZ_IN_KHZ
681}
682
683/*
684 * Later on we can perhaps use the more restrictive DFS
685 * region but we don't have information for that yet so
686 * for now simply disallow conflicts.
687 */
688static enum nl80211_dfs_regions
689reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
690 const enum nl80211_dfs_regions dfs_region2)
691{
692 if (dfs_region1 != dfs_region2)
693 return NL80211_DFS_UNSET;
694 return dfs_region1;
695}
696
697/*
698 * Helper for regdom_intersect(), this does the real
699 * mathematical intersection fun
700 */
701static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
702 const struct ieee80211_regdomain *rd2,
703 const struct ieee80211_reg_rule *rule1,
704 const struct ieee80211_reg_rule *rule2,
705 struct ieee80211_reg_rule *intersected_rule)
706{
707 const struct ieee80211_freq_range *freq_range1, *freq_range2;
708 struct ieee80211_freq_range *freq_range;
709 const struct ieee80211_power_rule *power_rule1, *power_rule2;
710 struct ieee80211_power_rule *power_rule;
711 u32 freq_diff, max_bandwidth1, max_bandwidth2;
712
713 freq_range1 = &rule1->freq_range;
714 freq_range2 = &rule2->freq_range;
715 freq_range = &intersected_rule->freq_range;
716
717 power_rule1 = &rule1->power_rule;
718 power_rule2 = &rule2->power_rule;
719 power_rule = &intersected_rule->power_rule;
720
721 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
722 freq_range2->start_freq_khz);
723 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
724 freq_range2->end_freq_khz);
725
726 max_bandwidth1 = freq_range1->max_bandwidth_khz;
727 max_bandwidth2 = freq_range2->max_bandwidth_khz;
728
729 if (rule1->flags & NL80211_RRF_AUTO_BW)
730 max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
731 if (rule2->flags & NL80211_RRF_AUTO_BW)
732 max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
733
734 freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
735
736 intersected_rule->flags = rule1->flags | rule2->flags;
737
738 /*
739 * In case NL80211_RRF_AUTO_BW requested for both rules
740 * set AUTO_BW in intersected rule also. Next we will
741 * calculate BW correctly in handle_channel function.
742 * In other case remove AUTO_BW flag while we calculate
743 * maximum bandwidth correctly and auto calculation is
744 * not required.
745 */
746 if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
747 (rule2->flags & NL80211_RRF_AUTO_BW))
748 intersected_rule->flags |= NL80211_RRF_AUTO_BW;
749 else
750 intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
751
752 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
753 if (freq_range->max_bandwidth_khz > freq_diff)
754 freq_range->max_bandwidth_khz = freq_diff;
755
756 power_rule->max_eirp = min(power_rule1->max_eirp,
757 power_rule2->max_eirp);
758 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
759 power_rule2->max_antenna_gain);
760
761 intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms,
762 rule2->dfs_cac_ms);
763
764 if (!is_valid_reg_rule(intersected_rule))
765 return -EINVAL;
766
767 return 0;
768}
769
770/**
771 * regdom_intersect - do the intersection between two regulatory domains
772 * @rd1: first regulatory domain
773 * @rd2: second regulatory domain
774 *
775 * Use this function to get the intersection between two regulatory domains.
776 * Once completed we will mark the alpha2 for the rd as intersected, "98",
777 * as no one single alpha2 can represent this regulatory domain.
778 *
779 * Returns a pointer to the regulatory domain structure which will hold the
780 * resulting intersection of rules between rd1 and rd2. We will
781 * kzalloc() this structure for you.
782 */
783static struct ieee80211_regdomain *
784regdom_intersect(const struct ieee80211_regdomain *rd1,
785 const struct ieee80211_regdomain *rd2)
786{
787 int r, size_of_regd;
788 unsigned int x, y;
789 unsigned int num_rules = 0, rule_idx = 0;
790 const struct ieee80211_reg_rule *rule1, *rule2;
791 struct ieee80211_reg_rule *intersected_rule;
792 struct ieee80211_regdomain *rd;
793 /* This is just a dummy holder to help us count */
794 struct ieee80211_reg_rule dummy_rule;
795
796 if (!rd1 || !rd2)
797 return NULL;
798
799 /*
800 * First we get a count of the rules we'll need, then we actually
801 * build them. This is to so we can malloc() and free() a
802 * regdomain once. The reason we use reg_rules_intersect() here
803 * is it will return -EINVAL if the rule computed makes no sense.
804 * All rules that do check out OK are valid.
805 */
806
807 for (x = 0; x < rd1->n_reg_rules; x++) {
808 rule1 = &rd1->reg_rules[x];
809 for (y = 0; y < rd2->n_reg_rules; y++) {
810 rule2 = &rd2->reg_rules[y];
811 if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
812 &dummy_rule))
813 num_rules++;
814 }
815 }
816
817 if (!num_rules)
818 return NULL;
819
820 size_of_regd = sizeof(struct ieee80211_regdomain) +
821 num_rules * sizeof(struct ieee80211_reg_rule);
822
823 rd = kzalloc(size_of_regd, GFP_KERNEL);
824 if (!rd)
825 return NULL;
826
827 for (x = 0; x < rd1->n_reg_rules && rule_idx < num_rules; x++) {
828 rule1 = &rd1->reg_rules[x];
829 for (y = 0; y < rd2->n_reg_rules && rule_idx < num_rules; y++) {
830 rule2 = &rd2->reg_rules[y];
831 /*
832 * This time around instead of using the stack lets
833 * write to the target rule directly saving ourselves
834 * a memcpy()
835 */
836 intersected_rule = &rd->reg_rules[rule_idx];
837 r = reg_rules_intersect(rd1, rd2, rule1, rule2,
838 intersected_rule);
839 /*
840 * No need to memset here the intersected rule here as
841 * we're not using the stack anymore
842 */
843 if (r)
844 continue;
845 rule_idx++;
846 }
847 }
848
849 if (rule_idx != num_rules) {
850 kfree(rd);
851 return NULL;
852 }
853
854 rd->n_reg_rules = num_rules;
855 rd->alpha2[0] = '9';
856 rd->alpha2[1] = '8';
857 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
858 rd2->dfs_region);
859
860 return rd;
861}
862
863/*
864 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
865 * want to just have the channel structure use these
866 */
867static u32 map_regdom_flags(u32 rd_flags)
868{
869 u32 channel_flags = 0;
870 if (rd_flags & NL80211_RRF_NO_IR_ALL)
871 channel_flags |= IEEE80211_CHAN_NO_IR;
872 if (rd_flags & NL80211_RRF_DFS)
873 channel_flags |= IEEE80211_CHAN_RADAR;
874 if (rd_flags & NL80211_RRF_NO_OFDM)
875 channel_flags |= IEEE80211_CHAN_NO_OFDM;
876 return channel_flags;
877}
878
879static const struct ieee80211_reg_rule *
880freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq,
881 const struct ieee80211_regdomain *regd)
882{
883 int i;
884 bool band_rule_found = false;
885 bool bw_fits = false;
886
887 if (!regd)
888 return ERR_PTR(-EINVAL);
889
890 for (i = 0; i < regd->n_reg_rules; i++) {
891 const struct ieee80211_reg_rule *rr;
892 const struct ieee80211_freq_range *fr = NULL;
893
894 rr = ®d->reg_rules[i];
895 fr = &rr->freq_range;
896
897 /*
898 * We only need to know if one frequency rule was
899 * was in center_freq's band, that's enough, so lets
900 * not overwrite it once found
901 */
902 if (!band_rule_found)
903 band_rule_found = freq_in_rule_band(fr, center_freq);
904
905 bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20));
906
907 if (band_rule_found && bw_fits)
908 return rr;
909 }
910
911 if (!band_rule_found)
912 return ERR_PTR(-ERANGE);
913
914 return ERR_PTR(-EINVAL);
915}
916
917const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
918 u32 center_freq)
919{
920 const struct ieee80211_regdomain *regd;
921
922 regd = reg_get_regdomain(wiphy);
923
924 return freq_reg_info_regd(wiphy, center_freq, regd);
925}
926EXPORT_SYMBOL(freq_reg_info);
927
928const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
929{
930 switch (initiator) {
931 case NL80211_REGDOM_SET_BY_CORE:
932 return "core";
933 case NL80211_REGDOM_SET_BY_USER:
934 return "user";
935 case NL80211_REGDOM_SET_BY_DRIVER:
936 return "driver";
937 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
938 return "country IE";
939 default:
940 WARN_ON(1);
941 return "bug";
942 }
943}
944EXPORT_SYMBOL(reg_initiator_name);
945
946#ifdef CONFIG_CFG80211_REG_DEBUG
947static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain *regd,
948 struct ieee80211_channel *chan,
949 const struct ieee80211_reg_rule *reg_rule)
950{
951 const struct ieee80211_power_rule *power_rule;
952 const struct ieee80211_freq_range *freq_range;
953 char max_antenna_gain[32], bw[32];
954
955 power_rule = ®_rule->power_rule;
956 freq_range = ®_rule->freq_range;
957
958 if (!power_rule->max_antenna_gain)
959 snprintf(max_antenna_gain, sizeof(max_antenna_gain), "N/A");
960 else
961 snprintf(max_antenna_gain, sizeof(max_antenna_gain), "%d",
962 power_rule->max_antenna_gain);
963
964 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
965 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
966 freq_range->max_bandwidth_khz,
967 reg_get_max_bandwidth(regd, reg_rule));
968 else
969 snprintf(bw, sizeof(bw), "%d KHz",
970 freq_range->max_bandwidth_khz);
971
972 REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
973 chan->center_freq);
974
975 REG_DBG_PRINT("%d KHz - %d KHz @ %s), (%s mBi, %d mBm)\n",
976 freq_range->start_freq_khz, freq_range->end_freq_khz,
977 bw, max_antenna_gain,
978 power_rule->max_eirp);
979}
980#else
981static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain *regd,
982 struct ieee80211_channel *chan,
983 const struct ieee80211_reg_rule *reg_rule)
984{
985 return;
986}
987#endif
988
989/*
990 * Note that right now we assume the desired channel bandwidth
991 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
992 * per channel, the primary and the extension channel).
993 */
994static void handle_channel(struct wiphy *wiphy,
995 enum nl80211_reg_initiator initiator,
996 struct ieee80211_channel *chan)
997{
998 u32 flags, bw_flags = 0;
999 const struct ieee80211_reg_rule *reg_rule = NULL;
1000 const struct ieee80211_power_rule *power_rule = NULL;
1001 const struct ieee80211_freq_range *freq_range = NULL;
1002 struct wiphy *request_wiphy = NULL;
1003 struct regulatory_request *lr = get_last_request();
1004 const struct ieee80211_regdomain *regd;
1005 u32 max_bandwidth_khz;
1006
1007 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1008
1009 flags = chan->orig_flags;
1010
1011 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
1012 if (IS_ERR(reg_rule)) {
1013 /*
1014 * We will disable all channels that do not match our
1015 * received regulatory rule unless the hint is coming
1016 * from a Country IE and the Country IE had no information
1017 * about a band. The IEEE 802.11 spec allows for an AP
1018 * to send only a subset of the regulatory rules allowed,
1019 * so an AP in the US that only supports 2.4 GHz may only send
1020 * a country IE with information for the 2.4 GHz band
1021 * while 5 GHz is still supported.
1022 */
1023 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1024 PTR_ERR(reg_rule) == -ERANGE)
1025 return;
1026
1027 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1028 request_wiphy && request_wiphy == wiphy &&
1029 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1030 REG_DBG_PRINT("Disabling freq %d MHz for good\n",
1031 chan->center_freq);
1032 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1033 chan->flags = chan->orig_flags;
1034 } else {
1035 REG_DBG_PRINT("Disabling freq %d MHz\n",
1036 chan->center_freq);
1037 chan->flags |= IEEE80211_CHAN_DISABLED;
1038 }
1039 return;
1040 }
1041
1042 regd = reg_get_regdomain(wiphy);
1043 chan_reg_rule_print_dbg(regd, chan, reg_rule);
1044
1045 power_rule = ®_rule->power_rule;
1046 freq_range = ®_rule->freq_range;
1047
1048 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1049 /* Check if auto calculation requested */
1050 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
1051 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1052
1053 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1054 bw_flags = IEEE80211_CHAN_NO_HT40;
1055 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1056 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1057 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1058 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1059
1060 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1061 request_wiphy && request_wiphy == wiphy &&
1062 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1063 /*
1064 * This guarantees the driver's requested regulatory domain
1065 * will always be used as a base for further regulatory
1066 * settings
1067 */
1068 chan->flags = chan->orig_flags =
1069 map_regdom_flags(reg_rule->flags) | bw_flags;
1070 chan->max_antenna_gain = chan->orig_mag =
1071 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1072 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
1073 (int) MBM_TO_DBM(power_rule->max_eirp);
1074 return;
1075 }
1076
1077 chan->dfs_state = NL80211_DFS_USABLE;
1078 chan->dfs_state_entered = jiffies;
1079
1080 chan->beacon_found = false;
1081 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1082 chan->max_antenna_gain =
1083 min_t(int, chan->orig_mag,
1084 MBI_TO_DBI(power_rule->max_antenna_gain));
1085 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1086
1087 if (chan->flags & IEEE80211_CHAN_RADAR) {
1088 if (reg_rule->dfs_cac_ms)
1089 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1090 else
1091 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1092 }
1093
1094 if (chan->orig_mpwr) {
1095 /*
1096 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1097 * will always follow the passed country IE power settings.
1098 */
1099 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1100 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
1101 chan->max_power = chan->max_reg_power;
1102 else
1103 chan->max_power = min(chan->orig_mpwr,
1104 chan->max_reg_power);
1105 } else
1106 chan->max_power = chan->max_reg_power;
1107}
1108
1109static void handle_band(struct wiphy *wiphy,
1110 enum nl80211_reg_initiator initiator,
1111 struct ieee80211_supported_band *sband)
1112{
1113 unsigned int i;
1114
1115 if (!sband)
1116 return;
1117
1118 for (i = 0; i < sband->n_channels; i++)
1119 handle_channel(wiphy, initiator, &sband->channels[i]);
1120}
1121
1122static bool reg_request_cell_base(struct regulatory_request *request)
1123{
1124 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1125 return false;
1126 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1127}
1128
1129bool reg_last_request_cell_base(void)
1130{
1131 return reg_request_cell_base(get_last_request());
1132}
1133
1134#ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
1135/* Core specific check */
1136static enum reg_request_treatment
1137reg_ignore_cell_hint(struct regulatory_request *pending_request)
1138{
1139 struct regulatory_request *lr = get_last_request();
1140
1141 if (!reg_num_devs_support_basehint)
1142 return REG_REQ_IGNORE;
1143
1144 if (reg_request_cell_base(lr) &&
1145 !regdom_changes(pending_request->alpha2))
1146 return REG_REQ_ALREADY_SET;
1147
1148 return REG_REQ_OK;
1149}
1150
1151/* Device specific check */
1152static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1153{
1154 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1155}
1156#else
1157static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
1158{
1159 return REG_REQ_IGNORE;
1160}
1161
1162static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1163{
1164 return true;
1165}
1166#endif
1167
1168static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1169{
1170 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1171 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1172 return true;
1173 return false;
1174}
1175
1176static bool ignore_reg_update(struct wiphy *wiphy,
1177 enum nl80211_reg_initiator initiator)
1178{
1179 struct regulatory_request *lr = get_last_request();
1180
1181 if (!lr) {
1182 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1183 "since last_request is not set\n",
1184 reg_initiator_name(initiator));
1185 return true;
1186 }
1187
1188 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1189 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1190 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1191 "since the driver uses its own custom "
1192 "regulatory domain\n",
1193 reg_initiator_name(initiator));
1194 return true;
1195 }
1196
1197 /*
1198 * wiphy->regd will be set once the device has its own
1199 * desired regulatory domain set
1200 */
1201 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1202 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1203 !is_world_regdom(lr->alpha2)) {
1204 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1205 "since the driver requires its own regulatory "
1206 "domain to be set first\n",
1207 reg_initiator_name(initiator));
1208 return true;
1209 }
1210
1211 if (reg_request_cell_base(lr))
1212 return reg_dev_ignore_cell_hint(wiphy);
1213
1214 return false;
1215}
1216
1217static bool reg_is_world_roaming(struct wiphy *wiphy)
1218{
1219 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1220 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1221 struct regulatory_request *lr = get_last_request();
1222
1223 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1224 return true;
1225
1226 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1227 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1228 return true;
1229
1230 return false;
1231}
1232
1233static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1234 struct reg_beacon *reg_beacon)
1235{
1236 struct ieee80211_supported_band *sband;
1237 struct ieee80211_channel *chan;
1238 bool channel_changed = false;
1239 struct ieee80211_channel chan_before;
1240
1241 sband = wiphy->bands[reg_beacon->chan.band];
1242 chan = &sband->channels[chan_idx];
1243
1244 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1245 return;
1246
1247 if (chan->beacon_found)
1248 return;
1249
1250 chan->beacon_found = true;
1251
1252 if (!reg_is_world_roaming(wiphy))
1253 return;
1254
1255 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1256 return;
1257
1258 chan_before.center_freq = chan->center_freq;
1259 chan_before.flags = chan->flags;
1260
1261 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1262 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1263 channel_changed = true;
1264 }
1265
1266 if (channel_changed)
1267 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1268}
1269
1270/*
1271 * Called when a scan on a wiphy finds a beacon on
1272 * new channel
1273 */
1274static void wiphy_update_new_beacon(struct wiphy *wiphy,
1275 struct reg_beacon *reg_beacon)
1276{
1277 unsigned int i;
1278 struct ieee80211_supported_band *sband;
1279
1280 if (!wiphy->bands[reg_beacon->chan.band])
1281 return;
1282
1283 sband = wiphy->bands[reg_beacon->chan.band];
1284
1285 for (i = 0; i < sband->n_channels; i++)
1286 handle_reg_beacon(wiphy, i, reg_beacon);
1287}
1288
1289/*
1290 * Called upon reg changes or a new wiphy is added
1291 */
1292static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1293{
1294 unsigned int i;
1295 struct ieee80211_supported_band *sband;
1296 struct reg_beacon *reg_beacon;
1297
1298 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1299 if (!wiphy->bands[reg_beacon->chan.band])
1300 continue;
1301 sband = wiphy->bands[reg_beacon->chan.band];
1302 for (i = 0; i < sband->n_channels; i++)
1303 handle_reg_beacon(wiphy, i, reg_beacon);
1304 }
1305}
1306
1307/* Reap the advantages of previously found beacons */
1308static void reg_process_beacons(struct wiphy *wiphy)
1309{
1310 /*
1311 * Means we are just firing up cfg80211, so no beacons would
1312 * have been processed yet.
1313 */
1314 if (!last_request)
1315 return;
1316 wiphy_update_beacon_reg(wiphy);
1317}
1318
1319static bool is_ht40_allowed(struct ieee80211_channel *chan)
1320{
1321 if (!chan)
1322 return false;
1323 if (chan->flags & IEEE80211_CHAN_DISABLED)
1324 return false;
1325 /* This would happen when regulatory rules disallow HT40 completely */
1326 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
1327 return false;
1328 return true;
1329}
1330
1331static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1332 struct ieee80211_channel *channel)
1333{
1334 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
1335 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1336 unsigned int i;
1337
1338 if (!is_ht40_allowed(channel)) {
1339 channel->flags |= IEEE80211_CHAN_NO_HT40;
1340 return;
1341 }
1342
1343 /*
1344 * We need to ensure the extension channels exist to
1345 * be able to use HT40- or HT40+, this finds them (or not)
1346 */
1347 for (i = 0; i < sband->n_channels; i++) {
1348 struct ieee80211_channel *c = &sband->channels[i];
1349
1350 if (c->center_freq == (channel->center_freq - 20))
1351 channel_before = c;
1352 if (c->center_freq == (channel->center_freq + 20))
1353 channel_after = c;
1354 }
1355
1356 /*
1357 * Please note that this assumes target bandwidth is 20 MHz,
1358 * if that ever changes we also need to change the below logic
1359 * to include that as well.
1360 */
1361 if (!is_ht40_allowed(channel_before))
1362 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1363 else
1364 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1365
1366 if (!is_ht40_allowed(channel_after))
1367 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1368 else
1369 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1370}
1371
1372static void reg_process_ht_flags_band(struct wiphy *wiphy,
1373 struct ieee80211_supported_band *sband)
1374{
1375 unsigned int i;
1376
1377 if (!sband)
1378 return;
1379
1380 for (i = 0; i < sband->n_channels; i++)
1381 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
1382}
1383
1384static void reg_process_ht_flags(struct wiphy *wiphy)
1385{
1386 enum ieee80211_band band;
1387
1388 if (!wiphy)
1389 return;
1390
1391 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1392 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
1393}
1394
1395static void reg_call_notifier(struct wiphy *wiphy,
1396 struct regulatory_request *request)
1397{
1398 if (wiphy->reg_notifier)
1399 wiphy->reg_notifier(wiphy, request);
1400}
1401
1402static void wiphy_update_regulatory(struct wiphy *wiphy,
1403 enum nl80211_reg_initiator initiator)
1404{
1405 enum ieee80211_band band;
1406 struct regulatory_request *lr = get_last_request();
1407
1408 if (ignore_reg_update(wiphy, initiator)) {
1409 /*
1410 * Regulatory updates set by CORE are ignored for custom
1411 * regulatory cards. Let us notify the changes to the driver,
1412 * as some drivers used this to restore its orig_* reg domain.
1413 */
1414 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1415 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1416 reg_call_notifier(wiphy, lr);
1417 return;
1418 }
1419
1420 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
1421
1422 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1423 handle_band(wiphy, initiator, wiphy->bands[band]);
1424
1425 reg_process_beacons(wiphy);
1426 reg_process_ht_flags(wiphy);
1427 reg_call_notifier(wiphy, lr);
1428}
1429
1430static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1431{
1432 struct cfg80211_registered_device *rdev;
1433 struct wiphy *wiphy;
1434
1435 ASSERT_RTNL();
1436
1437 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1438 wiphy = &rdev->wiphy;
1439 wiphy_update_regulatory(wiphy, initiator);
1440 }
1441}
1442
1443static void handle_channel_custom(struct wiphy *wiphy,
1444 struct ieee80211_channel *chan,
1445 const struct ieee80211_regdomain *regd)
1446{
1447 u32 bw_flags = 0;
1448 const struct ieee80211_reg_rule *reg_rule = NULL;
1449 const struct ieee80211_power_rule *power_rule = NULL;
1450 const struct ieee80211_freq_range *freq_range = NULL;
1451 u32 max_bandwidth_khz;
1452
1453 reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1454 regd);
1455
1456 if (IS_ERR(reg_rule)) {
1457 REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1458 chan->center_freq);
1459 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1460 chan->flags = chan->orig_flags;
1461 return;
1462 }
1463
1464 chan_reg_rule_print_dbg(regd, chan, reg_rule);
1465
1466 power_rule = ®_rule->power_rule;
1467 freq_range = ®_rule->freq_range;
1468
1469 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1470 /* Check if auto calculation requested */
1471 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
1472 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1473
1474 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1475 bw_flags = IEEE80211_CHAN_NO_HT40;
1476 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1477 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1478 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1479 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1480
1481 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1482 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1483 chan->max_reg_power = chan->max_power =
1484 (int) MBM_TO_DBM(power_rule->max_eirp);
1485}
1486
1487static void handle_band_custom(struct wiphy *wiphy,
1488 struct ieee80211_supported_band *sband,
1489 const struct ieee80211_regdomain *regd)
1490{
1491 unsigned int i;
1492
1493 if (!sband)
1494 return;
1495
1496 for (i = 0; i < sband->n_channels; i++)
1497 handle_channel_custom(wiphy, &sband->channels[i], regd);
1498}
1499
1500/* Used by drivers prior to wiphy registration */
1501void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1502 const struct ieee80211_regdomain *regd)
1503{
1504 enum ieee80211_band band;
1505 unsigned int bands_set = 0;
1506
1507 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
1508 "wiphy should have REGULATORY_CUSTOM_REG\n");
1509 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
1510
1511 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1512 if (!wiphy->bands[band])
1513 continue;
1514 handle_band_custom(wiphy, wiphy->bands[band], regd);
1515 bands_set++;
1516 }
1517
1518 /*
1519 * no point in calling this if it won't have any effect
1520 * on your device's supported bands.
1521 */
1522 WARN_ON(!bands_set);
1523}
1524EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1525
1526static void reg_set_request_processed(void)
1527{
1528 bool need_more_processing = false;
1529 struct regulatory_request *lr = get_last_request();
1530
1531 lr->processed = true;
1532
1533 spin_lock(®_requests_lock);
1534 if (!list_empty(®_requests_list))
1535 need_more_processing = true;
1536 spin_unlock(®_requests_lock);
1537
1538 if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
1539 cancel_delayed_work(®_timeout);
1540
1541 if (need_more_processing)
1542 schedule_work(®_work);
1543}
1544
1545/**
1546 * reg_process_hint_core - process core regulatory requests
1547 * @pending_request: a pending core regulatory request
1548 *
1549 * The wireless subsystem can use this function to process
1550 * a regulatory request issued by the regulatory core.
1551 *
1552 * Returns one of the different reg request treatment values.
1553 */
1554static enum reg_request_treatment
1555reg_process_hint_core(struct regulatory_request *core_request)
1556{
1557
1558 core_request->intersect = false;
1559 core_request->processed = false;
1560
1561 reg_update_last_request(core_request);
1562
1563 return reg_call_crda(core_request);
1564}
1565
1566static enum reg_request_treatment
1567__reg_process_hint_user(struct regulatory_request *user_request)
1568{
1569 struct regulatory_request *lr = get_last_request();
1570
1571 if (reg_request_cell_base(user_request))
1572 return reg_ignore_cell_hint(user_request);
1573
1574 if (reg_request_cell_base(lr))
1575 return REG_REQ_IGNORE;
1576
1577 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1578 return REG_REQ_INTERSECT;
1579 /*
1580 * If the user knows better the user should set the regdom
1581 * to their country before the IE is picked up
1582 */
1583 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
1584 lr->intersect)
1585 return REG_REQ_IGNORE;
1586 /*
1587 * Process user requests only after previous user/driver/core
1588 * requests have been processed
1589 */
1590 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
1591 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1592 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
1593 regdom_changes(lr->alpha2))
1594 return REG_REQ_IGNORE;
1595
1596 if (!regdom_changes(user_request->alpha2))
1597 return REG_REQ_ALREADY_SET;
1598
1599 return REG_REQ_OK;
1600}
1601
1602/**
1603 * reg_process_hint_user - process user regulatory requests
1604 * @user_request: a pending user regulatory request
1605 *
1606 * The wireless subsystem can use this function to process
1607 * a regulatory request initiated by userspace.
1608 *
1609 * Returns one of the different reg request treatment values.
1610 */
1611static enum reg_request_treatment
1612reg_process_hint_user(struct regulatory_request *user_request)
1613{
1614 enum reg_request_treatment treatment;
1615
1616 treatment = __reg_process_hint_user(user_request);
1617 if (treatment == REG_REQ_IGNORE ||
1618 treatment == REG_REQ_ALREADY_SET) {
1619 kfree(user_request);
1620 return treatment;
1621 }
1622
1623 user_request->intersect = treatment == REG_REQ_INTERSECT;
1624 user_request->processed = false;
1625
1626 reg_update_last_request(user_request);
1627
1628 user_alpha2[0] = user_request->alpha2[0];
1629 user_alpha2[1] = user_request->alpha2[1];
1630
1631 return reg_call_crda(user_request);
1632}
1633
1634static enum reg_request_treatment
1635__reg_process_hint_driver(struct regulatory_request *driver_request)
1636{
1637 struct regulatory_request *lr = get_last_request();
1638
1639 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
1640 if (regdom_changes(driver_request->alpha2))
1641 return REG_REQ_OK;
1642 return REG_REQ_ALREADY_SET;
1643 }
1644
1645 /*
1646 * This would happen if you unplug and plug your card
1647 * back in or if you add a new device for which the previously
1648 * loaded card also agrees on the regulatory domain.
1649 */
1650 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1651 !regdom_changes(driver_request->alpha2))
1652 return REG_REQ_ALREADY_SET;
1653
1654 return REG_REQ_INTERSECT;
1655}
1656
1657/**
1658 * reg_process_hint_driver - process driver regulatory requests
1659 * @driver_request: a pending driver regulatory request
1660 *
1661 * The wireless subsystem can use this function to process
1662 * a regulatory request issued by an 802.11 driver.
1663 *
1664 * Returns one of the different reg request treatment values.
1665 */
1666static enum reg_request_treatment
1667reg_process_hint_driver(struct wiphy *wiphy,
1668 struct regulatory_request *driver_request)
1669{
1670 const struct ieee80211_regdomain *regd;
1671 enum reg_request_treatment treatment;
1672
1673 treatment = __reg_process_hint_driver(driver_request);
1674
1675 switch (treatment) {
1676 case REG_REQ_OK:
1677 break;
1678 case REG_REQ_IGNORE:
1679 kfree(driver_request);
1680 return treatment;
1681 case REG_REQ_INTERSECT:
1682 /* fall through */
1683 case REG_REQ_ALREADY_SET:
1684 regd = reg_copy_regd(get_cfg80211_regdom());
1685 if (IS_ERR(regd)) {
1686 kfree(driver_request);
1687 return REG_REQ_IGNORE;
1688 }
1689 rcu_assign_pointer(wiphy->regd, regd);
1690 }
1691
1692
1693 driver_request->intersect = treatment == REG_REQ_INTERSECT;
1694 driver_request->processed = false;
1695
1696 reg_update_last_request(driver_request);
1697
1698 /*
1699 * Since CRDA will not be called in this case as we already
1700 * have applied the requested regulatory domain before we just
1701 * inform userspace we have processed the request
1702 */
1703 if (treatment == REG_REQ_ALREADY_SET) {
1704 nl80211_send_reg_change_event(driver_request);
1705 reg_set_request_processed();
1706 return treatment;
1707 }
1708
1709 return reg_call_crda(driver_request);
1710}
1711
1712static enum reg_request_treatment
1713__reg_process_hint_country_ie(struct wiphy *wiphy,
1714 struct regulatory_request *country_ie_request)
1715{
1716 struct wiphy *last_wiphy = NULL;
1717 struct regulatory_request *lr = get_last_request();
1718
1719 if (reg_request_cell_base(lr)) {
1720 /* Trust a Cell base station over the AP's country IE */
1721 if (regdom_changes(country_ie_request->alpha2))
1722 return REG_REQ_IGNORE;
1723 return REG_REQ_ALREADY_SET;
1724 } else {
1725 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
1726 return REG_REQ_IGNORE;
1727 }
1728
1729 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
1730 return -EINVAL;
1731
1732 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
1733 return REG_REQ_OK;
1734
1735 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1736
1737 if (last_wiphy != wiphy) {
1738 /*
1739 * Two cards with two APs claiming different
1740 * Country IE alpha2s. We could
1741 * intersect them, but that seems unlikely
1742 * to be correct. Reject second one for now.
1743 */
1744 if (regdom_changes(country_ie_request->alpha2))
1745 return REG_REQ_IGNORE;
1746 return REG_REQ_ALREADY_SET;
1747 }
1748 /*
1749 * Two consecutive Country IE hints on the same wiphy.
1750 * This should be picked up early by the driver/stack
1751 */
1752 if (WARN_ON(regdom_changes(country_ie_request->alpha2)))
1753 return REG_REQ_OK;
1754 return REG_REQ_ALREADY_SET;
1755}
1756
1757/**
1758 * reg_process_hint_country_ie - process regulatory requests from country IEs
1759 * @country_ie_request: a regulatory request from a country IE
1760 *
1761 * The wireless subsystem can use this function to process
1762 * a regulatory request issued by a country Information Element.
1763 *
1764 * Returns one of the different reg request treatment values.
1765 */
1766static enum reg_request_treatment
1767reg_process_hint_country_ie(struct wiphy *wiphy,
1768 struct regulatory_request *country_ie_request)
1769{
1770 enum reg_request_treatment treatment;
1771
1772 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
1773
1774 switch (treatment) {
1775 case REG_REQ_OK:
1776 break;
1777 case REG_REQ_IGNORE:
1778 /* fall through */
1779 case REG_REQ_ALREADY_SET:
1780 kfree(country_ie_request);
1781 return treatment;
1782 case REG_REQ_INTERSECT:
1783 kfree(country_ie_request);
1784 /*
1785 * This doesn't happen yet, not sure we
1786 * ever want to support it for this case.
1787 */
1788 WARN_ONCE(1, "Unexpected intersection for country IEs");
1789 return REG_REQ_IGNORE;
1790 }
1791
1792 country_ie_request->intersect = false;
1793 country_ie_request->processed = false;
1794
1795 reg_update_last_request(country_ie_request);
1796
1797 return reg_call_crda(country_ie_request);
1798}
1799
1800/* This processes *all* regulatory hints */
1801static void reg_process_hint(struct regulatory_request *reg_request)
1802{
1803 struct wiphy *wiphy = NULL;
1804 enum reg_request_treatment treatment;
1805
1806 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
1807 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1808
1809 switch (reg_request->initiator) {
1810 case NL80211_REGDOM_SET_BY_CORE:
1811 reg_process_hint_core(reg_request);
1812 return;
1813 case NL80211_REGDOM_SET_BY_USER:
1814 treatment = reg_process_hint_user(reg_request);
1815 if (treatment == REG_REQ_IGNORE ||
1816 treatment == REG_REQ_ALREADY_SET)
1817 return;
1818 queue_delayed_work(system_power_efficient_wq,
1819 ®_timeout, msecs_to_jiffies(3142));
1820 return;
1821 case NL80211_REGDOM_SET_BY_DRIVER:
1822 if (!wiphy)
1823 goto out_free;
1824 treatment = reg_process_hint_driver(wiphy, reg_request);
1825 break;
1826 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1827 if (!wiphy)
1828 goto out_free;
1829 treatment = reg_process_hint_country_ie(wiphy, reg_request);
1830 break;
1831 default:
1832 WARN(1, "invalid initiator %d\n", reg_request->initiator);
1833 goto out_free;
1834 }
1835
1836 /* This is required so that the orig_* parameters are saved */
1837 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
1838 wiphy->regulatory_flags & REGULATORY_STRICT_REG)
1839 wiphy_update_regulatory(wiphy, reg_request->initiator);
1840
1841 return;
1842
1843out_free:
1844 kfree(reg_request);
1845}
1846
1847/*
1848 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1849 * Regulatory hints come on a first come first serve basis and we
1850 * must process each one atomically.
1851 */
1852static void reg_process_pending_hints(void)
1853{
1854 struct regulatory_request *reg_request, *lr;
1855
1856 lr = get_last_request();
1857
1858 /* When last_request->processed becomes true this will be rescheduled */
1859 if (lr && !lr->processed) {
1860 REG_DBG_PRINT("Pending regulatory request, waiting for it to be processed...\n");
1861 return;
1862 }
1863
1864 spin_lock(®_requests_lock);
1865
1866 if (list_empty(®_requests_list)) {
1867 spin_unlock(®_requests_lock);
1868 return;
1869 }
1870
1871 reg_request = list_first_entry(®_requests_list,
1872 struct regulatory_request,
1873 list);
1874 list_del_init(®_request->list);
1875
1876 spin_unlock(®_requests_lock);
1877
1878 reg_process_hint(reg_request);
1879}
1880
1881/* Processes beacon hints -- this has nothing to do with country IEs */
1882static void reg_process_pending_beacon_hints(void)
1883{
1884 struct cfg80211_registered_device *rdev;
1885 struct reg_beacon *pending_beacon, *tmp;
1886
1887 /* This goes through the _pending_ beacon list */
1888 spin_lock_bh(®_pending_beacons_lock);
1889
1890 list_for_each_entry_safe(pending_beacon, tmp,
1891 ®_pending_beacons, list) {
1892 list_del_init(&pending_beacon->list);
1893
1894 /* Applies the beacon hint to current wiphys */
1895 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1896 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1897
1898 /* Remembers the beacon hint for new wiphys or reg changes */
1899 list_add_tail(&pending_beacon->list, ®_beacon_list);
1900 }
1901
1902 spin_unlock_bh(®_pending_beacons_lock);
1903}
1904
1905static void reg_todo(struct work_struct *work)
1906{
1907 rtnl_lock();
1908 reg_process_pending_hints();
1909 reg_process_pending_beacon_hints();
1910 rtnl_unlock();
1911}
1912
1913static void queue_regulatory_request(struct regulatory_request *request)
1914{
1915 request->alpha2[0] = toupper(request->alpha2[0]);
1916 request->alpha2[1] = toupper(request->alpha2[1]);
1917
1918 spin_lock(®_requests_lock);
1919 list_add_tail(&request->list, ®_requests_list);
1920 spin_unlock(®_requests_lock);
1921
1922 schedule_work(®_work);
1923}
1924
1925/*
1926 * Core regulatory hint -- happens during cfg80211_init()
1927 * and when we restore regulatory settings.
1928 */
1929static int regulatory_hint_core(const char *alpha2)
1930{
1931 struct regulatory_request *request;
1932
1933 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1934 if (!request)
1935 return -ENOMEM;
1936
1937 request->alpha2[0] = alpha2[0];
1938 request->alpha2[1] = alpha2[1];
1939 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1940
1941 queue_regulatory_request(request);
1942
1943 return 0;
1944}
1945
1946/* User hints */
1947int regulatory_hint_user(const char *alpha2,
1948 enum nl80211_user_reg_hint_type user_reg_hint_type)
1949{
1950 struct regulatory_request *request;
1951
1952 if (WARN_ON(!alpha2))
1953 return -EINVAL;
1954
1955 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1956 if (!request)
1957 return -ENOMEM;
1958
1959 request->wiphy_idx = WIPHY_IDX_INVALID;
1960 request->alpha2[0] = alpha2[0];
1961 request->alpha2[1] = alpha2[1];
1962 request->initiator = NL80211_REGDOM_SET_BY_USER;
1963 request->user_reg_hint_type = user_reg_hint_type;
1964
1965 queue_regulatory_request(request);
1966
1967 return 0;
1968}
1969
1970/* Driver hints */
1971int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1972{
1973 struct regulatory_request *request;
1974
1975 if (WARN_ON(!alpha2 || !wiphy))
1976 return -EINVAL;
1977
1978 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
1979
1980 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1981 if (!request)
1982 return -ENOMEM;
1983
1984 request->wiphy_idx = get_wiphy_idx(wiphy);
1985
1986 request->alpha2[0] = alpha2[0];
1987 request->alpha2[1] = alpha2[1];
1988 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1989
1990 queue_regulatory_request(request);
1991
1992 return 0;
1993}
1994EXPORT_SYMBOL(regulatory_hint);
1995
1996void regulatory_hint_country_ie(struct wiphy *wiphy, enum ieee80211_band band,
1997 const u8 *country_ie, u8 country_ie_len)
1998{
1999 char alpha2[2];
2000 enum environment_cap env = ENVIRON_ANY;
2001 struct regulatory_request *request = NULL, *lr;
2002
2003 /* IE len must be evenly divisible by 2 */
2004 if (country_ie_len & 0x01)
2005 return;
2006
2007 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
2008 return;
2009
2010 request = kzalloc(sizeof(*request), GFP_KERNEL);
2011 if (!request)
2012 return;
2013
2014 alpha2[0] = country_ie[0];
2015 alpha2[1] = country_ie[1];
2016
2017 if (country_ie[2] == 'I')
2018 env = ENVIRON_INDOOR;
2019 else if (country_ie[2] == 'O')
2020 env = ENVIRON_OUTDOOR;
2021
2022 rcu_read_lock();
2023 lr = get_last_request();
2024
2025 if (unlikely(!lr))
2026 goto out;
2027
2028 /*
2029 * We will run this only upon a successful connection on cfg80211.
2030 * We leave conflict resolution to the workqueue, where can hold
2031 * the RTNL.
2032 */
2033 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
2034 lr->wiphy_idx != WIPHY_IDX_INVALID)
2035 goto out;
2036
2037 request->wiphy_idx = get_wiphy_idx(wiphy);
2038 request->alpha2[0] = alpha2[0];
2039 request->alpha2[1] = alpha2[1];
2040 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
2041 request->country_ie_env = env;
2042
2043 queue_regulatory_request(request);
2044 request = NULL;
2045out:
2046 kfree(request);
2047 rcu_read_unlock();
2048}
2049
2050static void restore_alpha2(char *alpha2, bool reset_user)
2051{
2052 /* indicates there is no alpha2 to consider for restoration */
2053 alpha2[0] = '9';
2054 alpha2[1] = '7';
2055
2056 /* The user setting has precedence over the module parameter */
2057 if (is_user_regdom_saved()) {
2058 /* Unless we're asked to ignore it and reset it */
2059 if (reset_user) {
2060 REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
2061 user_alpha2[0] = '9';
2062 user_alpha2[1] = '7';
2063
2064 /*
2065 * If we're ignoring user settings, we still need to
2066 * check the module parameter to ensure we put things
2067 * back as they were for a full restore.
2068 */
2069 if (!is_world_regdom(ieee80211_regdom)) {
2070 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2071 ieee80211_regdom[0], ieee80211_regdom[1]);
2072 alpha2[0] = ieee80211_regdom[0];
2073 alpha2[1] = ieee80211_regdom[1];
2074 }
2075 } else {
2076 REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
2077 user_alpha2[0], user_alpha2[1]);
2078 alpha2[0] = user_alpha2[0];
2079 alpha2[1] = user_alpha2[1];
2080 }
2081 } else if (!is_world_regdom(ieee80211_regdom)) {
2082 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2083 ieee80211_regdom[0], ieee80211_regdom[1]);
2084 alpha2[0] = ieee80211_regdom[0];
2085 alpha2[1] = ieee80211_regdom[1];
2086 } else
2087 REG_DBG_PRINT("Restoring regulatory settings\n");
2088}
2089
2090static void restore_custom_reg_settings(struct wiphy *wiphy)
2091{
2092 struct ieee80211_supported_band *sband;
2093 enum ieee80211_band band;
2094 struct ieee80211_channel *chan;
2095 int i;
2096
2097 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
2098 sband = wiphy->bands[band];
2099 if (!sband)
2100 continue;
2101 for (i = 0; i < sband->n_channels; i++) {
2102 chan = &sband->channels[i];
2103 chan->flags = chan->orig_flags;
2104 chan->max_antenna_gain = chan->orig_mag;
2105 chan->max_power = chan->orig_mpwr;
2106 chan->beacon_found = false;
2107 }
2108 }
2109}
2110
2111/*
2112 * Restoring regulatory settings involves ingoring any
2113 * possibly stale country IE information and user regulatory
2114 * settings if so desired, this includes any beacon hints
2115 * learned as we could have traveled outside to another country
2116 * after disconnection. To restore regulatory settings we do
2117 * exactly what we did at bootup:
2118 *
2119 * - send a core regulatory hint
2120 * - send a user regulatory hint if applicable
2121 *
2122 * Device drivers that send a regulatory hint for a specific country
2123 * keep their own regulatory domain on wiphy->regd so that does does
2124 * not need to be remembered.
2125 */
2126static void restore_regulatory_settings(bool reset_user)
2127{
2128 char alpha2[2];
2129 char world_alpha2[2];
2130 struct reg_beacon *reg_beacon, *btmp;
2131 struct regulatory_request *reg_request, *tmp;
2132 LIST_HEAD(tmp_reg_req_list);
2133 struct cfg80211_registered_device *rdev;
2134
2135 ASSERT_RTNL();
2136
2137 reset_regdomains(true, &world_regdom);
2138 restore_alpha2(alpha2, reset_user);
2139
2140 /*
2141 * If there's any pending requests we simply
2142 * stash them to a temporary pending queue and
2143 * add then after we've restored regulatory
2144 * settings.
2145 */
2146 spin_lock(®_requests_lock);
2147 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
2148 if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER)
2149 continue;
2150 list_move_tail(®_request->list, &tmp_reg_req_list);
2151 }
2152 spin_unlock(®_requests_lock);
2153
2154 /* Clear beacon hints */
2155 spin_lock_bh(®_pending_beacons_lock);
2156 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2157 list_del(®_beacon->list);
2158 kfree(reg_beacon);
2159 }
2160 spin_unlock_bh(®_pending_beacons_lock);
2161
2162 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2163 list_del(®_beacon->list);
2164 kfree(reg_beacon);
2165 }
2166
2167 /* First restore to the basic regulatory settings */
2168 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
2169 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
2170
2171 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2172 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
2173 restore_custom_reg_settings(&rdev->wiphy);
2174 }
2175
2176 regulatory_hint_core(world_alpha2);
2177
2178 /*
2179 * This restores the ieee80211_regdom module parameter
2180 * preference or the last user requested regulatory
2181 * settings, user regulatory settings takes precedence.
2182 */
2183 if (is_an_alpha2(alpha2))
2184 regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
2185
2186 spin_lock(®_requests_lock);
2187 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
2188 spin_unlock(®_requests_lock);
2189
2190 REG_DBG_PRINT("Kicking the queue\n");
2191
2192 schedule_work(®_work);
2193}
2194
2195void regulatory_hint_disconnect(void)
2196{
2197 REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
2198 restore_regulatory_settings(false);
2199}
2200
2201static bool freq_is_chan_12_13_14(u16 freq)
2202{
2203 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
2204 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
2205 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
2206 return true;
2207 return false;
2208}
2209
2210static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
2211{
2212 struct reg_beacon *pending_beacon;
2213
2214 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
2215 if (beacon_chan->center_freq ==
2216 pending_beacon->chan.center_freq)
2217 return true;
2218 return false;
2219}
2220
2221int regulatory_hint_found_beacon(struct wiphy *wiphy,
2222 struct ieee80211_channel *beacon_chan,
2223 gfp_t gfp)
2224{
2225 struct reg_beacon *reg_beacon;
2226 bool processing;
2227
2228 if (beacon_chan->beacon_found ||
2229 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
2230 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
2231 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
2232 return 0;
2233
2234 spin_lock_bh(®_pending_beacons_lock);
2235 processing = pending_reg_beacon(beacon_chan);
2236 spin_unlock_bh(®_pending_beacons_lock);
2237
2238 if (processing)
2239 return 0;
2240
2241 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
2242 if (!reg_beacon)
2243 return -ENOMEM;
2244
2245 REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
2246 beacon_chan->center_freq,
2247 ieee80211_frequency_to_channel(beacon_chan->center_freq),
2248 wiphy_name(wiphy));
2249
2250 memcpy(®_beacon->chan, beacon_chan,
2251 sizeof(struct ieee80211_channel));
2252
2253 /*
2254 * Since we can be called from BH or and non-BH context
2255 * we must use spin_lock_bh()
2256 */
2257 spin_lock_bh(®_pending_beacons_lock);
2258 list_add_tail(®_beacon->list, ®_pending_beacons);
2259 spin_unlock_bh(®_pending_beacons_lock);
2260
2261 schedule_work(®_work);
2262
2263 return 0;
2264}
2265
2266static void print_rd_rules(const struct ieee80211_regdomain *rd)
2267{
2268 unsigned int i;
2269 const struct ieee80211_reg_rule *reg_rule = NULL;
2270 const struct ieee80211_freq_range *freq_range = NULL;
2271 const struct ieee80211_power_rule *power_rule = NULL;
2272 char bw[32], cac_time[32];
2273
2274 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
2275
2276 for (i = 0; i < rd->n_reg_rules; i++) {
2277 reg_rule = &rd->reg_rules[i];
2278 freq_range = ®_rule->freq_range;
2279 power_rule = ®_rule->power_rule;
2280
2281 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
2282 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
2283 freq_range->max_bandwidth_khz,
2284 reg_get_max_bandwidth(rd, reg_rule));
2285 else
2286 snprintf(bw, sizeof(bw), "%d KHz",
2287 freq_range->max_bandwidth_khz);
2288
2289 if (reg_rule->flags & NL80211_RRF_DFS)
2290 scnprintf(cac_time, sizeof(cac_time), "%u s",
2291 reg_rule->dfs_cac_ms/1000);
2292 else
2293 scnprintf(cac_time, sizeof(cac_time), "N/A");
2294
2295
2296 /*
2297 * There may not be documentation for max antenna gain
2298 * in certain regions
2299 */
2300 if (power_rule->max_antenna_gain)
2301 pr_info(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
2302 freq_range->start_freq_khz,
2303 freq_range->end_freq_khz,
2304 bw,
2305 power_rule->max_antenna_gain,
2306 power_rule->max_eirp,
2307 cac_time);
2308 else
2309 pr_info(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
2310 freq_range->start_freq_khz,
2311 freq_range->end_freq_khz,
2312 bw,
2313 power_rule->max_eirp,
2314 cac_time);
2315 }
2316}
2317
2318bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
2319{
2320 switch (dfs_region) {
2321 case NL80211_DFS_UNSET:
2322 case NL80211_DFS_FCC:
2323 case NL80211_DFS_ETSI:
2324 case NL80211_DFS_JP:
2325 return true;
2326 default:
2327 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2328 dfs_region);
2329 return false;
2330 }
2331}
2332
2333static void print_regdomain(const struct ieee80211_regdomain *rd)
2334{
2335 struct regulatory_request *lr = get_last_request();
2336
2337 if (is_intersected_alpha2(rd->alpha2)) {
2338 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2339 struct cfg80211_registered_device *rdev;
2340 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
2341 if (rdev) {
2342 pr_info("Current regulatory domain updated by AP to: %c%c\n",
2343 rdev->country_ie_alpha2[0],
2344 rdev->country_ie_alpha2[1]);
2345 } else
2346 pr_info("Current regulatory domain intersected:\n");
2347 } else
2348 pr_info("Current regulatory domain intersected:\n");
2349 } else if (is_world_regdom(rd->alpha2)) {
2350 pr_info("World regulatory domain updated:\n");
2351 } else {
2352 if (is_unknown_alpha2(rd->alpha2))
2353 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
2354 else {
2355 if (reg_request_cell_base(lr))
2356 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
2357 rd->alpha2[0], rd->alpha2[1]);
2358 else
2359 pr_info("Regulatory domain changed to country: %c%c\n",
2360 rd->alpha2[0], rd->alpha2[1]);
2361 }
2362 }
2363
2364 pr_info(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
2365 print_rd_rules(rd);
2366}
2367
2368static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2369{
2370 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
2371 print_rd_rules(rd);
2372}
2373
2374static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
2375{
2376 if (!is_world_regdom(rd->alpha2))
2377 return -EINVAL;
2378 update_world_regdomain(rd);
2379 return 0;
2380}
2381
2382static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
2383 struct regulatory_request *user_request)
2384{
2385 const struct ieee80211_regdomain *intersected_rd = NULL;
2386
2387 if (!regdom_changes(rd->alpha2))
2388 return -EALREADY;
2389
2390 if (!is_valid_rd(rd)) {
2391 pr_err("Invalid regulatory domain detected:\n");
2392 print_regdomain_info(rd);
2393 return -EINVAL;
2394 }
2395
2396 if (!user_request->intersect) {
2397 reset_regdomains(false, rd);
2398 return 0;
2399 }
2400
2401 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2402 if (!intersected_rd)
2403 return -EINVAL;
2404
2405 kfree(rd);
2406 rd = NULL;
2407 reset_regdomains(false, intersected_rd);
2408
2409 return 0;
2410}
2411
2412static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
2413 struct regulatory_request *driver_request)
2414{
2415 const struct ieee80211_regdomain *regd;
2416 const struct ieee80211_regdomain *intersected_rd = NULL;
2417 const struct ieee80211_regdomain *tmp;
2418 struct wiphy *request_wiphy;
2419
2420 if (is_world_regdom(rd->alpha2))
2421 return -EINVAL;
2422
2423 if (!regdom_changes(rd->alpha2))
2424 return -EALREADY;
2425
2426 if (!is_valid_rd(rd)) {
2427 pr_err("Invalid regulatory domain detected:\n");
2428 print_regdomain_info(rd);
2429 return -EINVAL;
2430 }
2431
2432 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
2433 if (!request_wiphy) {
2434 queue_delayed_work(system_power_efficient_wq,
2435 ®_timeout, 0);
2436 return -ENODEV;
2437 }
2438
2439 if (!driver_request->intersect) {
2440 if (request_wiphy->regd)
2441 return -EALREADY;
2442
2443 regd = reg_copy_regd(rd);
2444 if (IS_ERR(regd))
2445 return PTR_ERR(regd);
2446
2447 rcu_assign_pointer(request_wiphy->regd, regd);
2448 reset_regdomains(false, rd);
2449 return 0;
2450 }
2451
2452 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2453 if (!intersected_rd)
2454 return -EINVAL;
2455
2456 /*
2457 * We can trash what CRDA provided now.
2458 * However if a driver requested this specific regulatory
2459 * domain we keep it for its private use
2460 */
2461 tmp = get_wiphy_regdom(request_wiphy);
2462 rcu_assign_pointer(request_wiphy->regd, rd);
2463 rcu_free_regdom(tmp);
2464
2465 rd = NULL;
2466
2467 reset_regdomains(false, intersected_rd);
2468
2469 return 0;
2470}
2471
2472static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
2473 struct regulatory_request *country_ie_request)
2474{
2475 struct wiphy *request_wiphy;
2476
2477 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2478 !is_unknown_alpha2(rd->alpha2))
2479 return -EINVAL;
2480
2481 /*
2482 * Lets only bother proceeding on the same alpha2 if the current
2483 * rd is non static (it means CRDA was present and was used last)
2484 * and the pending request came in from a country IE
2485 */
2486
2487 if (!is_valid_rd(rd)) {
2488 pr_err("Invalid regulatory domain detected:\n");
2489 print_regdomain_info(rd);
2490 return -EINVAL;
2491 }
2492
2493 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
2494 if (!request_wiphy) {
2495 queue_delayed_work(system_power_efficient_wq,
2496 ®_timeout, 0);
2497 return -ENODEV;
2498 }
2499
2500 if (country_ie_request->intersect)
2501 return -EINVAL;
2502
2503 reset_regdomains(false, rd);
2504 return 0;
2505}
2506
2507/*
2508 * Use this call to set the current regulatory domain. Conflicts with
2509 * multiple drivers can be ironed out later. Caller must've already
2510 * kmalloc'd the rd structure.
2511 */
2512int set_regdom(const struct ieee80211_regdomain *rd)
2513{
2514 struct regulatory_request *lr;
2515 bool user_reset = false;
2516 int r;
2517
2518 if (!reg_is_valid_request(rd->alpha2)) {
2519 kfree(rd);
2520 return -EINVAL;
2521 }
2522
2523 lr = get_last_request();
2524
2525 /* Note that this doesn't update the wiphys, this is done below */
2526 switch (lr->initiator) {
2527 case NL80211_REGDOM_SET_BY_CORE:
2528 r = reg_set_rd_core(rd);
2529 break;
2530 case NL80211_REGDOM_SET_BY_USER:
2531 r = reg_set_rd_user(rd, lr);
2532 user_reset = true;
2533 break;
2534 case NL80211_REGDOM_SET_BY_DRIVER:
2535 r = reg_set_rd_driver(rd, lr);
2536 break;
2537 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2538 r = reg_set_rd_country_ie(rd, lr);
2539 break;
2540 default:
2541 WARN(1, "invalid initiator %d\n", lr->initiator);
2542 return -EINVAL;
2543 }
2544
2545 if (r) {
2546 switch (r) {
2547 case -EALREADY:
2548 reg_set_request_processed();
2549 break;
2550 default:
2551 /* Back to world regulatory in case of errors */
2552 restore_regulatory_settings(user_reset);
2553 }
2554
2555 kfree(rd);
2556 return r;
2557 }
2558
2559 /* This would make this whole thing pointless */
2560 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
2561 return -EINVAL;
2562
2563 /* update all wiphys now with the new established regulatory domain */
2564 update_all_wiphy_regulatory(lr->initiator);
2565
2566 print_regdomain(get_cfg80211_regdom());
2567
2568 nl80211_send_reg_change_event(lr);
2569
2570 reg_set_request_processed();
2571
2572 return 0;
2573}
2574
2575void wiphy_regulatory_register(struct wiphy *wiphy)
2576{
2577 struct regulatory_request *lr;
2578
2579 if (!reg_dev_ignore_cell_hint(wiphy))
2580 reg_num_devs_support_basehint++;
2581
2582 lr = get_last_request();
2583 wiphy_update_regulatory(wiphy, lr->initiator);
2584}
2585
2586void wiphy_regulatory_deregister(struct wiphy *wiphy)
2587{
2588 struct wiphy *request_wiphy = NULL;
2589 struct regulatory_request *lr;
2590
2591 lr = get_last_request();
2592
2593 if (!reg_dev_ignore_cell_hint(wiphy))
2594 reg_num_devs_support_basehint--;
2595
2596 rcu_free_regdom(get_wiphy_regdom(wiphy));
2597 rcu_assign_pointer(wiphy->regd, NULL);
2598
2599 if (lr)
2600 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2601
2602 if (!request_wiphy || request_wiphy != wiphy)
2603 return;
2604
2605 lr->wiphy_idx = WIPHY_IDX_INVALID;
2606 lr->country_ie_env = ENVIRON_ANY;
2607}
2608
2609static void reg_timeout_work(struct work_struct *work)
2610{
2611 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
2612 rtnl_lock();
2613 restore_regulatory_settings(true);
2614 rtnl_unlock();
2615}
2616
2617int __init regulatory_init(void)
2618{
2619 int err = 0;
2620
2621 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2622 if (IS_ERR(reg_pdev))
2623 return PTR_ERR(reg_pdev);
2624
2625 spin_lock_init(®_requests_lock);
2626 spin_lock_init(®_pending_beacons_lock);
2627
2628 reg_regdb_size_check();
2629
2630 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
2631
2632 user_alpha2[0] = '9';
2633 user_alpha2[1] = '7';
2634
2635 /* We always try to get an update for the static regdomain */
2636 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
2637 if (err) {
2638 if (err == -ENOMEM)
2639 return err;
2640 /*
2641 * N.B. kobject_uevent_env() can fail mainly for when we're out
2642 * memory which is handled and propagated appropriately above
2643 * but it can also fail during a netlink_broadcast() or during
2644 * early boot for call_usermodehelper(). For now treat these
2645 * errors as non-fatal.
2646 */
2647 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2648 }
2649
2650 /*
2651 * Finally, if the user set the module parameter treat it
2652 * as a user hint.
2653 */
2654 if (!is_world_regdom(ieee80211_regdom))
2655 regulatory_hint_user(ieee80211_regdom,
2656 NL80211_USER_REG_HINT_USER);
2657
2658 return 0;
2659}
2660
2661void regulatory_exit(void)
2662{
2663 struct regulatory_request *reg_request, *tmp;
2664 struct reg_beacon *reg_beacon, *btmp;
2665
2666 cancel_work_sync(®_work);
2667 cancel_delayed_work_sync(®_timeout);
2668
2669 /* Lock to suppress warnings */
2670 rtnl_lock();
2671 reset_regdomains(true, NULL);
2672 rtnl_unlock();
2673
2674 dev_set_uevent_suppress(®_pdev->dev, true);
2675
2676 platform_device_unregister(reg_pdev);
2677
2678 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2679 list_del(®_beacon->list);
2680 kfree(reg_beacon);
2681 }
2682
2683 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2684 list_del(®_beacon->list);
2685 kfree(reg_beacon);
2686 }
2687
2688 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
2689 list_del(®_request->list);
2690 kfree(reg_request);
2691 }
2692}