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>
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.
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.
22 * DOC: Wireless regulatory infrastructure
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.
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.
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.
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.
45 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
47 #include <linux/kernel.h>
48 #include <linux/export.h>
49 #include <linux/slab.h>
50 #include <linux/list.h>
51 #include <linux/random.h>
52 #include <linux/ctype.h>
53 #include <linux/nl80211.h>
54 #include <linux/platform_device.h>
55 #include <linux/moduleparam.h>
56 #include <net/cfg80211.h>
62 #ifdef CONFIG_CFG80211_REG_DEBUG
63 #define REG_DBG_PRINT(format, args...) \
64 printk(KERN_DEBUG pr_fmt(format), ##args)
66 #define REG_DBG_PRINT(args...)
69 static struct regulatory_request core_request_world = {
70 .initiator = NL80211_REGDOM_SET_BY_CORE,
75 .country_ie_env = ENVIRON_ANY,
78 /* Receipt of information from last regulatory request */
79 static struct regulatory_request *last_request = &core_request_world;
81 /* To trigger userspace events */
82 static struct platform_device *reg_pdev;
84 static struct device_type reg_device_type = {
85 .uevent = reg_device_uevent,
89 * Central wireless core regulatory domains, we only need two,
90 * the current one and a world regulatory domain in case we have no
91 * information to give us an alpha2
93 const struct ieee80211_regdomain *cfg80211_regdomain;
96 * Protects static reg.c components:
97 * - cfg80211_world_regdom
100 * - reg_num_devs_support_basehint
102 static DEFINE_MUTEX(reg_mutex);
105 * Number of devices that registered to the core
106 * that support cellular base station regulatory hints
108 static int reg_num_devs_support_basehint;
110 static inline void assert_reg_lock(void)
112 lockdep_assert_held(®_mutex);
115 /* Used to queue up regulatory hints */
116 static LIST_HEAD(reg_requests_list);
117 static spinlock_t reg_requests_lock;
119 /* Used to queue up beacon hints for review */
120 static LIST_HEAD(reg_pending_beacons);
121 static spinlock_t reg_pending_beacons_lock;
123 /* Used to keep track of processed beacon hints */
124 static LIST_HEAD(reg_beacon_list);
127 struct list_head list;
128 struct ieee80211_channel chan;
131 static void reg_todo(struct work_struct *work);
132 static DECLARE_WORK(reg_work, reg_todo);
134 static void reg_timeout_work(struct work_struct *work);
135 static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
137 /* We keep a static world regulatory domain in case of the absence of CRDA */
138 static const struct ieee80211_regdomain world_regdom = {
142 /* IEEE 802.11b/g, channels 1..11 */
143 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
144 /* IEEE 802.11b/g, channels 12..13. No HT40
145 * channel fits here. */
146 REG_RULE(2467-10, 2472+10, 20, 6, 20,
147 NL80211_RRF_PASSIVE_SCAN |
148 NL80211_RRF_NO_IBSS),
149 /* IEEE 802.11 channel 14 - Only JP enables
150 * this and for 802.11b only */
151 REG_RULE(2484-10, 2484+10, 20, 6, 20,
152 NL80211_RRF_PASSIVE_SCAN |
153 NL80211_RRF_NO_IBSS |
154 NL80211_RRF_NO_OFDM),
155 /* IEEE 802.11a, channel 36..48 */
156 REG_RULE(5180-10, 5240+10, 40, 6, 20,
157 NL80211_RRF_PASSIVE_SCAN |
158 NL80211_RRF_NO_IBSS),
160 /* NB: 5260 MHz - 5700 MHz requies DFS */
162 /* IEEE 802.11a, channel 149..165 */
163 REG_RULE(5745-10, 5825+10, 40, 6, 20,
164 NL80211_RRF_PASSIVE_SCAN |
165 NL80211_RRF_NO_IBSS),
167 /* IEEE 802.11ad (60gHz), channels 1..3 */
168 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
172 static const struct ieee80211_regdomain *cfg80211_world_regdom =
175 static char *ieee80211_regdom = "00";
176 static char user_alpha2[2];
178 module_param(ieee80211_regdom, charp, 0444);
179 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
181 static void reset_regdomains(bool full_reset)
183 /* avoid freeing static information or freeing something twice */
184 if (cfg80211_regdomain == cfg80211_world_regdom)
185 cfg80211_regdomain = NULL;
186 if (cfg80211_world_regdom == &world_regdom)
187 cfg80211_world_regdom = NULL;
188 if (cfg80211_regdomain == &world_regdom)
189 cfg80211_regdomain = NULL;
191 kfree(cfg80211_regdomain);
192 kfree(cfg80211_world_regdom);
194 cfg80211_world_regdom = &world_regdom;
195 cfg80211_regdomain = NULL;
200 if (last_request != &core_request_world)
202 last_request = &core_request_world;
206 * Dynamic world regulatory domain requested by the wireless
207 * core upon initialization
209 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
211 BUG_ON(!last_request);
213 reset_regdomains(false);
215 cfg80211_world_regdom = rd;
216 cfg80211_regdomain = rd;
219 bool is_world_regdom(const char *alpha2)
223 if (alpha2[0] == '0' && alpha2[1] == '0')
228 static bool is_alpha2_set(const char *alpha2)
232 if (alpha2[0] != 0 && alpha2[1] != 0)
237 static bool is_unknown_alpha2(const char *alpha2)
242 * Special case where regulatory domain was built by driver
243 * but a specific alpha2 cannot be determined
245 if (alpha2[0] == '9' && alpha2[1] == '9')
250 static bool is_intersected_alpha2(const char *alpha2)
255 * Special case where regulatory domain is the
256 * result of an intersection between two regulatory domain
259 if (alpha2[0] == '9' && alpha2[1] == '8')
264 static bool is_an_alpha2(const char *alpha2)
268 if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
273 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
275 if (!alpha2_x || !alpha2_y)
277 if (alpha2_x[0] == alpha2_y[0] &&
278 alpha2_x[1] == alpha2_y[1])
283 static bool regdom_changes(const char *alpha2)
285 assert_cfg80211_lock();
287 if (!cfg80211_regdomain)
289 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
295 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
296 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
297 * has ever been issued.
299 static bool is_user_regdom_saved(void)
301 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
304 /* This would indicate a mistake on the design */
305 if (WARN((!is_world_regdom(user_alpha2) &&
306 !is_an_alpha2(user_alpha2)),
307 "Unexpected user alpha2: %c%c\n",
315 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
316 const struct ieee80211_regdomain *src_regd)
318 struct ieee80211_regdomain *regd;
319 int size_of_regd = 0;
322 size_of_regd = sizeof(struct ieee80211_regdomain) +
323 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
325 regd = kzalloc(size_of_regd, GFP_KERNEL);
329 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
331 for (i = 0; i < src_regd->n_reg_rules; i++)
332 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
333 sizeof(struct ieee80211_reg_rule));
339 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
340 struct reg_regdb_search_request {
342 struct list_head list;
345 static LIST_HEAD(reg_regdb_search_list);
346 static DEFINE_MUTEX(reg_regdb_search_mutex);
348 static void reg_regdb_search(struct work_struct *work)
350 struct reg_regdb_search_request *request;
351 const struct ieee80211_regdomain *curdom, *regdom;
354 mutex_lock(®_regdb_search_mutex);
355 while (!list_empty(®_regdb_search_list)) {
356 request = list_first_entry(®_regdb_search_list,
357 struct reg_regdb_search_request,
359 list_del(&request->list);
361 for (i=0; i<reg_regdb_size; i++) {
362 curdom = reg_regdb[i];
364 if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
365 r = reg_copy_regd(®dom, curdom);
368 mutex_lock(&cfg80211_mutex);
370 mutex_unlock(&cfg80211_mutex);
377 mutex_unlock(®_regdb_search_mutex);
380 static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
382 static void reg_regdb_query(const char *alpha2)
384 struct reg_regdb_search_request *request;
389 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
393 memcpy(request->alpha2, alpha2, 2);
395 mutex_lock(®_regdb_search_mutex);
396 list_add_tail(&request->list, ®_regdb_search_list);
397 mutex_unlock(®_regdb_search_mutex);
399 schedule_work(®_regdb_work);
402 /* Feel free to add any other sanity checks here */
403 static void reg_regdb_size_check(void)
405 /* We should ideally BUILD_BUG_ON() but then random builds would fail */
406 WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
409 static inline void reg_regdb_size_check(void) {}
410 static inline void reg_regdb_query(const char *alpha2) {}
411 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
414 * This lets us keep regulatory code which is updated on a regulatory
415 * basis in userspace. Country information is filled in by
418 static int call_crda(const char *alpha2)
420 if (!is_world_regdom((char *) alpha2))
421 pr_info("Calling CRDA for country: %c%c\n",
422 alpha2[0], alpha2[1]);
424 pr_info("Calling CRDA to update world regulatory domain\n");
426 /* query internal regulatory database (if it exists) */
427 reg_regdb_query(alpha2);
429 return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE);
432 /* Used by nl80211 before kmalloc'ing our regulatory domain */
433 bool reg_is_valid_request(const char *alpha2)
435 assert_cfg80211_lock();
440 return alpha2_equal(last_request->alpha2, alpha2);
443 /* Sanity check on a regulatory rule */
444 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
446 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
449 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
452 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
455 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
457 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
458 freq_range->max_bandwidth_khz > freq_diff)
464 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
466 const struct ieee80211_reg_rule *reg_rule = NULL;
469 if (!rd->n_reg_rules)
472 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
475 for (i = 0; i < rd->n_reg_rules; i++) {
476 reg_rule = &rd->reg_rules[i];
477 if (!is_valid_reg_rule(reg_rule))
484 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
488 u32 start_freq_khz, end_freq_khz;
490 start_freq_khz = center_freq_khz - (bw_khz/2);
491 end_freq_khz = center_freq_khz + (bw_khz/2);
493 if (start_freq_khz >= freq_range->start_freq_khz &&
494 end_freq_khz <= freq_range->end_freq_khz)
501 * freq_in_rule_band - tells us if a frequency is in a frequency band
502 * @freq_range: frequency rule we want to query
503 * @freq_khz: frequency we are inquiring about
505 * This lets us know if a specific frequency rule is or is not relevant to
506 * a specific frequency's band. Bands are device specific and artificial
507 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
508 * safe for now to assume that a frequency rule should not be part of a
509 * frequency's band if the start freq or end freq are off by more than 2 GHz.
510 * This resolution can be lowered and should be considered as we add
511 * regulatory rule support for other "bands".
513 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
516 #define ONE_GHZ_IN_KHZ 1000000
517 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
519 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
522 #undef ONE_GHZ_IN_KHZ
526 * Helper for regdom_intersect(), this does the real
527 * mathematical intersection fun
529 static int reg_rules_intersect(
530 const struct ieee80211_reg_rule *rule1,
531 const struct ieee80211_reg_rule *rule2,
532 struct ieee80211_reg_rule *intersected_rule)
534 const struct ieee80211_freq_range *freq_range1, *freq_range2;
535 struct ieee80211_freq_range *freq_range;
536 const struct ieee80211_power_rule *power_rule1, *power_rule2;
537 struct ieee80211_power_rule *power_rule;
540 freq_range1 = &rule1->freq_range;
541 freq_range2 = &rule2->freq_range;
542 freq_range = &intersected_rule->freq_range;
544 power_rule1 = &rule1->power_rule;
545 power_rule2 = &rule2->power_rule;
546 power_rule = &intersected_rule->power_rule;
548 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
549 freq_range2->start_freq_khz);
550 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
551 freq_range2->end_freq_khz);
552 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
553 freq_range2->max_bandwidth_khz);
555 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
556 if (freq_range->max_bandwidth_khz > freq_diff)
557 freq_range->max_bandwidth_khz = freq_diff;
559 power_rule->max_eirp = min(power_rule1->max_eirp,
560 power_rule2->max_eirp);
561 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
562 power_rule2->max_antenna_gain);
564 intersected_rule->flags = (rule1->flags | rule2->flags);
566 if (!is_valid_reg_rule(intersected_rule))
573 * regdom_intersect - do the intersection between two regulatory domains
574 * @rd1: first regulatory domain
575 * @rd2: second regulatory domain
577 * Use this function to get the intersection between two regulatory domains.
578 * Once completed we will mark the alpha2 for the rd as intersected, "98",
579 * as no one single alpha2 can represent this regulatory domain.
581 * Returns a pointer to the regulatory domain structure which will hold the
582 * resulting intersection of rules between rd1 and rd2. We will
583 * kzalloc() this structure for you.
585 static struct ieee80211_regdomain *regdom_intersect(
586 const struct ieee80211_regdomain *rd1,
587 const struct ieee80211_regdomain *rd2)
591 unsigned int num_rules = 0, rule_idx = 0;
592 const struct ieee80211_reg_rule *rule1, *rule2;
593 struct ieee80211_reg_rule *intersected_rule;
594 struct ieee80211_regdomain *rd;
595 /* This is just a dummy holder to help us count */
596 struct ieee80211_reg_rule irule;
598 /* Uses the stack temporarily for counter arithmetic */
599 intersected_rule = &irule;
601 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
607 * First we get a count of the rules we'll need, then we actually
608 * build them. This is to so we can malloc() and free() a
609 * regdomain once. The reason we use reg_rules_intersect() here
610 * is it will return -EINVAL if the rule computed makes no sense.
611 * All rules that do check out OK are valid.
614 for (x = 0; x < rd1->n_reg_rules; x++) {
615 rule1 = &rd1->reg_rules[x];
616 for (y = 0; y < rd2->n_reg_rules; y++) {
617 rule2 = &rd2->reg_rules[y];
618 if (!reg_rules_intersect(rule1, rule2,
621 memset(intersected_rule, 0,
622 sizeof(struct ieee80211_reg_rule));
629 size_of_regd = sizeof(struct ieee80211_regdomain) +
630 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
632 rd = kzalloc(size_of_regd, GFP_KERNEL);
636 for (x = 0; x < rd1->n_reg_rules; x++) {
637 rule1 = &rd1->reg_rules[x];
638 for (y = 0; y < rd2->n_reg_rules; y++) {
639 rule2 = &rd2->reg_rules[y];
641 * This time around instead of using the stack lets
642 * write to the target rule directly saving ourselves
645 intersected_rule = &rd->reg_rules[rule_idx];
646 r = reg_rules_intersect(rule1, rule2,
649 * No need to memset here the intersected rule here as
650 * we're not using the stack anymore
658 if (rule_idx != num_rules) {
663 rd->n_reg_rules = num_rules;
671 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
672 * want to just have the channel structure use these
674 static u32 map_regdom_flags(u32 rd_flags)
676 u32 channel_flags = 0;
677 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
678 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
679 if (rd_flags & NL80211_RRF_NO_IBSS)
680 channel_flags |= IEEE80211_CHAN_NO_IBSS;
681 if (rd_flags & NL80211_RRF_DFS)
682 channel_flags |= IEEE80211_CHAN_RADAR;
683 if (rd_flags & NL80211_RRF_NO_OFDM)
684 channel_flags |= IEEE80211_CHAN_NO_OFDM;
685 return channel_flags;
688 static int freq_reg_info_regd(struct wiphy *wiphy,
691 const struct ieee80211_reg_rule **reg_rule,
692 const struct ieee80211_regdomain *custom_regd)
695 bool band_rule_found = false;
696 const struct ieee80211_regdomain *regd;
697 bool bw_fits = false;
700 desired_bw_khz = MHZ_TO_KHZ(20);
702 regd = custom_regd ? custom_regd : cfg80211_regdomain;
705 * Follow the driver's regulatory domain, if present, unless a country
706 * IE has been processed or a user wants to help complaince further
709 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
710 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
717 for (i = 0; i < regd->n_reg_rules; i++) {
718 const struct ieee80211_reg_rule *rr;
719 const struct ieee80211_freq_range *fr = NULL;
721 rr = ®d->reg_rules[i];
722 fr = &rr->freq_range;
725 * We only need to know if one frequency rule was
726 * was in center_freq's band, that's enough, so lets
727 * not overwrite it once found
729 if (!band_rule_found)
730 band_rule_found = freq_in_rule_band(fr, center_freq);
732 bw_fits = reg_does_bw_fit(fr,
736 if (band_rule_found && bw_fits) {
742 if (!band_rule_found)
748 int freq_reg_info(struct wiphy *wiphy,
751 const struct ieee80211_reg_rule **reg_rule)
753 assert_cfg80211_lock();
754 return freq_reg_info_regd(wiphy,
760 EXPORT_SYMBOL(freq_reg_info);
762 #ifdef CONFIG_CFG80211_REG_DEBUG
763 static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
766 case NL80211_REGDOM_SET_BY_CORE:
767 return "Set by core";
768 case NL80211_REGDOM_SET_BY_USER:
769 return "Set by user";
770 case NL80211_REGDOM_SET_BY_DRIVER:
771 return "Set by driver";
772 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
773 return "Set by country IE";
780 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
782 const struct ieee80211_reg_rule *reg_rule)
784 const struct ieee80211_power_rule *power_rule;
785 const struct ieee80211_freq_range *freq_range;
786 char max_antenna_gain[32];
788 power_rule = ®_rule->power_rule;
789 freq_range = ®_rule->freq_range;
791 if (!power_rule->max_antenna_gain)
792 snprintf(max_antenna_gain, 32, "N/A");
794 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
796 REG_DBG_PRINT("Updating information on frequency %d MHz "
797 "for a %d MHz width channel with regulatory rule:\n",
799 KHZ_TO_MHZ(desired_bw_khz));
801 REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
802 freq_range->start_freq_khz,
803 freq_range->end_freq_khz,
804 freq_range->max_bandwidth_khz,
806 power_rule->max_eirp);
809 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
811 const struct ieee80211_reg_rule *reg_rule)
818 * Note that right now we assume the desired channel bandwidth
819 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
820 * per channel, the primary and the extension channel). To support
821 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
822 * new ieee80211_channel.target_bw and re run the regulatory check
823 * on the wiphy with the target_bw specified. Then we can simply use
824 * that below for the desired_bw_khz below.
826 static void handle_channel(struct wiphy *wiphy,
827 enum nl80211_reg_initiator initiator,
828 enum ieee80211_band band,
829 unsigned int chan_idx)
832 u32 flags, bw_flags = 0;
833 u32 desired_bw_khz = MHZ_TO_KHZ(20);
834 const struct ieee80211_reg_rule *reg_rule = NULL;
835 const struct ieee80211_power_rule *power_rule = NULL;
836 const struct ieee80211_freq_range *freq_range = NULL;
837 struct ieee80211_supported_band *sband;
838 struct ieee80211_channel *chan;
839 struct wiphy *request_wiphy = NULL;
841 assert_cfg80211_lock();
843 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
845 sband = wiphy->bands[band];
846 BUG_ON(chan_idx >= sband->n_channels);
847 chan = &sband->channels[chan_idx];
849 flags = chan->orig_flags;
851 r = freq_reg_info(wiphy,
852 MHZ_TO_KHZ(chan->center_freq),
858 * We will disable all channels that do not match our
859 * received regulatory rule unless the hint is coming
860 * from a Country IE and the Country IE had no information
861 * about a band. The IEEE 802.11 spec allows for an AP
862 * to send only a subset of the regulatory rules allowed,
863 * so an AP in the US that only supports 2.4 GHz may only send
864 * a country IE with information for the 2.4 GHz band
865 * while 5 GHz is still supported.
867 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
871 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
872 chan->flags = IEEE80211_CHAN_DISABLED;
876 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
878 power_rule = ®_rule->power_rule;
879 freq_range = ®_rule->freq_range;
881 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
882 bw_flags = IEEE80211_CHAN_NO_HT40;
884 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
885 request_wiphy && request_wiphy == wiphy &&
886 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
888 * This guarantees the driver's requested regulatory domain
889 * will always be used as a base for further regulatory
892 chan->flags = chan->orig_flags =
893 map_regdom_flags(reg_rule->flags) | bw_flags;
894 chan->max_antenna_gain = chan->orig_mag =
895 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
896 chan->max_power = chan->orig_mpwr =
897 (int) MBM_TO_DBM(power_rule->max_eirp);
901 chan->beacon_found = false;
902 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
903 chan->max_antenna_gain = min(chan->orig_mag,
904 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
905 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
906 if (chan->orig_mpwr) {
908 * Devices that have their own custom regulatory domain
909 * but also use WIPHY_FLAG_STRICT_REGULATORY will follow the
910 * passed country IE power settings.
912 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
913 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
914 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
915 chan->max_power = chan->max_reg_power;
917 chan->max_power = min(chan->orig_mpwr,
918 chan->max_reg_power);
920 chan->max_power = chan->max_reg_power;
923 static void handle_band(struct wiphy *wiphy,
924 enum ieee80211_band band,
925 enum nl80211_reg_initiator initiator)
928 struct ieee80211_supported_band *sband;
930 BUG_ON(!wiphy->bands[band]);
931 sband = wiphy->bands[band];
933 for (i = 0; i < sband->n_channels; i++)
934 handle_channel(wiphy, initiator, band, i);
937 static bool reg_request_cell_base(struct regulatory_request *request)
939 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
941 if (request->user_reg_hint_type != NL80211_USER_REG_HINT_CELL_BASE)
946 bool reg_last_request_cell_base(void)
949 assert_cfg80211_lock();
951 mutex_lock(®_mutex);
952 val = reg_request_cell_base(last_request);
953 mutex_unlock(®_mutex);
957 #ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
959 /* Core specific check */
960 static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
962 if (!reg_num_devs_support_basehint)
965 if (reg_request_cell_base(last_request)) {
966 if (!regdom_changes(pending_request->alpha2))
973 /* Device specific check */
974 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
976 if (!(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS))
981 static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
985 static int reg_dev_ignore_cell_hint(struct wiphy *wiphy)
992 static bool ignore_reg_update(struct wiphy *wiphy,
993 enum nl80211_reg_initiator initiator)
996 REG_DBG_PRINT("Ignoring regulatory request %s since "
997 "last_request is not set\n",
998 reg_initiator_name(initiator));
1002 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1003 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
1004 REG_DBG_PRINT("Ignoring regulatory request %s "
1005 "since the driver uses its own custom "
1006 "regulatory domain\n",
1007 reg_initiator_name(initiator));
1012 * wiphy->regd will be set once the device has its own
1013 * desired regulatory domain set
1015 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
1016 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1017 !is_world_regdom(last_request->alpha2)) {
1018 REG_DBG_PRINT("Ignoring regulatory request %s "
1019 "since the driver requires its own regulatory "
1020 "domain to be set first\n",
1021 reg_initiator_name(initiator));
1025 if (reg_request_cell_base(last_request))
1026 return reg_dev_ignore_cell_hint(wiphy);
1031 static void handle_reg_beacon(struct wiphy *wiphy,
1032 unsigned int chan_idx,
1033 struct reg_beacon *reg_beacon)
1035 struct ieee80211_supported_band *sband;
1036 struct ieee80211_channel *chan;
1037 bool channel_changed = false;
1038 struct ieee80211_channel chan_before;
1040 assert_cfg80211_lock();
1042 sband = wiphy->bands[reg_beacon->chan.band];
1043 chan = &sband->channels[chan_idx];
1045 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1048 if (chan->beacon_found)
1051 chan->beacon_found = true;
1053 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
1056 chan_before.center_freq = chan->center_freq;
1057 chan_before.flags = chan->flags;
1059 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
1060 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
1061 channel_changed = true;
1064 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
1065 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
1066 channel_changed = true;
1069 if (channel_changed)
1070 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1074 * Called when a scan on a wiphy finds a beacon on
1077 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1078 struct reg_beacon *reg_beacon)
1081 struct ieee80211_supported_band *sband;
1083 assert_cfg80211_lock();
1085 if (!wiphy->bands[reg_beacon->chan.band])
1088 sband = wiphy->bands[reg_beacon->chan.band];
1090 for (i = 0; i < sband->n_channels; i++)
1091 handle_reg_beacon(wiphy, i, reg_beacon);
1095 * Called upon reg changes or a new wiphy is added
1097 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1100 struct ieee80211_supported_band *sband;
1101 struct reg_beacon *reg_beacon;
1103 assert_cfg80211_lock();
1105 if (list_empty(®_beacon_list))
1108 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1109 if (!wiphy->bands[reg_beacon->chan.band])
1111 sband = wiphy->bands[reg_beacon->chan.band];
1112 for (i = 0; i < sband->n_channels; i++)
1113 handle_reg_beacon(wiphy, i, reg_beacon);
1117 static bool reg_is_world_roaming(struct wiphy *wiphy)
1119 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1120 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1123 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1124 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1129 /* Reap the advantages of previously found beacons */
1130 static void reg_process_beacons(struct wiphy *wiphy)
1133 * Means we are just firing up cfg80211, so no beacons would
1134 * have been processed yet.
1138 if (!reg_is_world_roaming(wiphy))
1140 wiphy_update_beacon_reg(wiphy);
1143 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1147 if (chan->flags & IEEE80211_CHAN_DISABLED)
1149 /* This would happen when regulatory rules disallow HT40 completely */
1150 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1155 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1156 enum ieee80211_band band,
1157 unsigned int chan_idx)
1159 struct ieee80211_supported_band *sband;
1160 struct ieee80211_channel *channel;
1161 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1164 assert_cfg80211_lock();
1166 sband = wiphy->bands[band];
1167 BUG_ON(chan_idx >= sband->n_channels);
1168 channel = &sband->channels[chan_idx];
1170 if (is_ht40_not_allowed(channel)) {
1171 channel->flags |= IEEE80211_CHAN_NO_HT40;
1176 * We need to ensure the extension channels exist to
1177 * be able to use HT40- or HT40+, this finds them (or not)
1179 for (i = 0; i < sband->n_channels; i++) {
1180 struct ieee80211_channel *c = &sband->channels[i];
1181 if (c->center_freq == (channel->center_freq - 20))
1183 if (c->center_freq == (channel->center_freq + 20))
1188 * Please note that this assumes target bandwidth is 20 MHz,
1189 * if that ever changes we also need to change the below logic
1190 * to include that as well.
1192 if (is_ht40_not_allowed(channel_before))
1193 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1195 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1197 if (is_ht40_not_allowed(channel_after))
1198 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1200 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1203 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1204 enum ieee80211_band band)
1207 struct ieee80211_supported_band *sband;
1209 BUG_ON(!wiphy->bands[band]);
1210 sband = wiphy->bands[band];
1212 for (i = 0; i < sband->n_channels; i++)
1213 reg_process_ht_flags_channel(wiphy, band, i);
1216 static void reg_process_ht_flags(struct wiphy *wiphy)
1218 enum ieee80211_band band;
1223 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1224 if (wiphy->bands[band])
1225 reg_process_ht_flags_band(wiphy, band);
1230 static void wiphy_update_regulatory(struct wiphy *wiphy,
1231 enum nl80211_reg_initiator initiator)
1233 enum ieee80211_band band;
1237 if (ignore_reg_update(wiphy, initiator))
1240 last_request->dfs_region = cfg80211_regdomain->dfs_region;
1242 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1243 if (wiphy->bands[band])
1244 handle_band(wiphy, band, initiator);
1247 reg_process_beacons(wiphy);
1248 reg_process_ht_flags(wiphy);
1249 if (wiphy->reg_notifier)
1250 wiphy->reg_notifier(wiphy, last_request);
1253 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1255 struct cfg80211_registered_device *rdev;
1256 struct wiphy *wiphy;
1258 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1259 wiphy = &rdev->wiphy;
1260 wiphy_update_regulatory(wiphy, initiator);
1262 * Regulatory updates set by CORE are ignored for custom
1263 * regulatory cards. Let us notify the changes to the driver,
1264 * as some drivers used this to restore its orig_* reg domain.
1266 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1267 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
1268 wiphy->reg_notifier)
1269 wiphy->reg_notifier(wiphy, last_request);
1273 static void handle_channel_custom(struct wiphy *wiphy,
1274 enum ieee80211_band band,
1275 unsigned int chan_idx,
1276 const struct ieee80211_regdomain *regd)
1279 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1281 const struct ieee80211_reg_rule *reg_rule = NULL;
1282 const struct ieee80211_power_rule *power_rule = NULL;
1283 const struct ieee80211_freq_range *freq_range = NULL;
1284 struct ieee80211_supported_band *sband;
1285 struct ieee80211_channel *chan;
1289 sband = wiphy->bands[band];
1290 BUG_ON(chan_idx >= sband->n_channels);
1291 chan = &sband->channels[chan_idx];
1293 r = freq_reg_info_regd(wiphy,
1294 MHZ_TO_KHZ(chan->center_freq),
1300 REG_DBG_PRINT("Disabling freq %d MHz as custom "
1301 "regd has no rule that fits a %d MHz "
1304 KHZ_TO_MHZ(desired_bw_khz));
1305 chan->flags = IEEE80211_CHAN_DISABLED;
1309 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1311 power_rule = ®_rule->power_rule;
1312 freq_range = ®_rule->freq_range;
1314 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1315 bw_flags = IEEE80211_CHAN_NO_HT40;
1317 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1318 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1319 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1322 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1323 const struct ieee80211_regdomain *regd)
1326 struct ieee80211_supported_band *sband;
1328 BUG_ON(!wiphy->bands[band]);
1329 sband = wiphy->bands[band];
1331 for (i = 0; i < sband->n_channels; i++)
1332 handle_channel_custom(wiphy, band, i, regd);
1335 /* Used by drivers prior to wiphy registration */
1336 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1337 const struct ieee80211_regdomain *regd)
1339 enum ieee80211_band band;
1340 unsigned int bands_set = 0;
1342 mutex_lock(®_mutex);
1343 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1344 if (!wiphy->bands[band])
1346 handle_band_custom(wiphy, band, regd);
1349 mutex_unlock(®_mutex);
1352 * no point in calling this if it won't have any effect
1353 * on your device's supportd bands.
1355 WARN_ON(!bands_set);
1357 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1360 * Return value which can be used by ignore_request() to indicate
1361 * it has been determined we should intersect two regulatory domains
1363 #define REG_INTERSECT 1
1365 /* This has the logic which determines when a new request
1366 * should be ignored. */
1367 static int ignore_request(struct wiphy *wiphy,
1368 struct regulatory_request *pending_request)
1370 struct wiphy *last_wiphy = NULL;
1372 assert_cfg80211_lock();
1374 /* All initial requests are respected */
1378 switch (pending_request->initiator) {
1379 case NL80211_REGDOM_SET_BY_CORE:
1381 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1383 if (reg_request_cell_base(last_request)) {
1384 /* Trust a Cell base station over the AP's country IE */
1385 if (regdom_changes(pending_request->alpha2))
1390 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1392 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1394 if (last_request->initiator ==
1395 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1396 if (last_wiphy != wiphy) {
1398 * Two cards with two APs claiming different
1399 * Country IE alpha2s. We could
1400 * intersect them, but that seems unlikely
1401 * to be correct. Reject second one for now.
1403 if (regdom_changes(pending_request->alpha2))
1408 * Two consecutive Country IE hints on the same wiphy.
1409 * This should be picked up early by the driver/stack
1411 if (WARN_ON(regdom_changes(pending_request->alpha2)))
1416 case NL80211_REGDOM_SET_BY_DRIVER:
1417 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1418 if (regdom_changes(pending_request->alpha2))
1424 * This would happen if you unplug and plug your card
1425 * back in or if you add a new device for which the previously
1426 * loaded card also agrees on the regulatory domain.
1428 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1429 !regdom_changes(pending_request->alpha2))
1432 return REG_INTERSECT;
1433 case NL80211_REGDOM_SET_BY_USER:
1434 if (reg_request_cell_base(pending_request))
1435 return reg_ignore_cell_hint(pending_request);
1437 if (reg_request_cell_base(last_request))
1440 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1441 return REG_INTERSECT;
1443 * If the user knows better the user should set the regdom
1444 * to their country before the IE is picked up
1446 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1447 last_request->intersect)
1450 * Process user requests only after previous user/driver/core
1451 * requests have been processed
1453 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1454 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1455 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1456 if (regdom_changes(last_request->alpha2))
1460 if (!regdom_changes(pending_request->alpha2))
1469 static void reg_set_request_processed(void)
1471 bool need_more_processing = false;
1473 last_request->processed = true;
1475 spin_lock(®_requests_lock);
1476 if (!list_empty(®_requests_list))
1477 need_more_processing = true;
1478 spin_unlock(®_requests_lock);
1480 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
1481 cancel_delayed_work(®_timeout);
1483 if (need_more_processing)
1484 schedule_work(®_work);
1488 * __regulatory_hint - hint to the wireless core a regulatory domain
1489 * @wiphy: if the hint comes from country information from an AP, this
1490 * is required to be set to the wiphy that received the information
1491 * @pending_request: the regulatory request currently being processed
1493 * The Wireless subsystem can use this function to hint to the wireless core
1494 * what it believes should be the current regulatory domain.
1496 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1497 * already been set or other standard error codes.
1499 * Caller must hold &cfg80211_mutex and ®_mutex
1501 static int __regulatory_hint(struct wiphy *wiphy,
1502 struct regulatory_request *pending_request)
1504 bool intersect = false;
1507 assert_cfg80211_lock();
1509 r = ignore_request(wiphy, pending_request);
1511 if (r == REG_INTERSECT) {
1512 if (pending_request->initiator ==
1513 NL80211_REGDOM_SET_BY_DRIVER) {
1514 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1516 kfree(pending_request);
1523 * If the regulatory domain being requested by the
1524 * driver has already been set just copy it to the
1527 if (r == -EALREADY &&
1528 pending_request->initiator ==
1529 NL80211_REGDOM_SET_BY_DRIVER) {
1530 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1532 kfree(pending_request);
1538 kfree(pending_request);
1543 if (last_request != &core_request_world)
1544 kfree(last_request);
1546 last_request = pending_request;
1547 last_request->intersect = intersect;
1549 pending_request = NULL;
1551 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1552 user_alpha2[0] = last_request->alpha2[0];
1553 user_alpha2[1] = last_request->alpha2[1];
1556 /* When r == REG_INTERSECT we do need to call CRDA */
1559 * Since CRDA will not be called in this case as we already
1560 * have applied the requested regulatory domain before we just
1561 * inform userspace we have processed the request
1563 if (r == -EALREADY) {
1564 nl80211_send_reg_change_event(last_request);
1565 reg_set_request_processed();
1570 return call_crda(last_request->alpha2);
1573 /* This processes *all* regulatory hints */
1574 static void reg_process_hint(struct regulatory_request *reg_request,
1575 enum nl80211_reg_initiator reg_initiator)
1578 struct wiphy *wiphy = NULL;
1580 BUG_ON(!reg_request->alpha2);
1582 if (wiphy_idx_valid(reg_request->wiphy_idx))
1583 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1585 if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1591 r = __regulatory_hint(wiphy, reg_request);
1592 /* This is required so that the orig_* parameters are saved */
1593 if (r == -EALREADY && wiphy &&
1594 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
1595 wiphy_update_regulatory(wiphy, reg_initiator);
1600 * We only time out user hints, given that they should be the only
1601 * source of bogus requests.
1603 if (r != -EALREADY &&
1604 reg_initiator == NL80211_REGDOM_SET_BY_USER)
1605 schedule_delayed_work(®_timeout, msecs_to_jiffies(3142));
1609 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1610 * Regulatory hints come on a first come first serve basis and we
1611 * must process each one atomically.
1613 static void reg_process_pending_hints(void)
1615 struct regulatory_request *reg_request;
1617 mutex_lock(&cfg80211_mutex);
1618 mutex_lock(®_mutex);
1620 /* When last_request->processed becomes true this will be rescheduled */
1621 if (last_request && !last_request->processed) {
1622 REG_DBG_PRINT("Pending regulatory request, waiting "
1623 "for it to be processed...\n");
1627 spin_lock(®_requests_lock);
1629 if (list_empty(®_requests_list)) {
1630 spin_unlock(®_requests_lock);
1634 reg_request = list_first_entry(®_requests_list,
1635 struct regulatory_request,
1637 list_del_init(®_request->list);
1639 spin_unlock(®_requests_lock);
1641 reg_process_hint(reg_request, reg_request->initiator);
1644 mutex_unlock(®_mutex);
1645 mutex_unlock(&cfg80211_mutex);
1648 /* Processes beacon hints -- this has nothing to do with country IEs */
1649 static void reg_process_pending_beacon_hints(void)
1651 struct cfg80211_registered_device *rdev;
1652 struct reg_beacon *pending_beacon, *tmp;
1655 * No need to hold the reg_mutex here as we just touch wiphys
1656 * and do not read or access regulatory variables.
1658 mutex_lock(&cfg80211_mutex);
1660 /* This goes through the _pending_ beacon list */
1661 spin_lock_bh(®_pending_beacons_lock);
1663 if (list_empty(®_pending_beacons)) {
1664 spin_unlock_bh(®_pending_beacons_lock);
1668 list_for_each_entry_safe(pending_beacon, tmp,
1669 ®_pending_beacons, list) {
1671 list_del_init(&pending_beacon->list);
1673 /* Applies the beacon hint to current wiphys */
1674 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1675 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1677 /* Remembers the beacon hint for new wiphys or reg changes */
1678 list_add_tail(&pending_beacon->list, ®_beacon_list);
1681 spin_unlock_bh(®_pending_beacons_lock);
1683 mutex_unlock(&cfg80211_mutex);
1686 static void reg_todo(struct work_struct *work)
1688 reg_process_pending_hints();
1689 reg_process_pending_beacon_hints();
1692 static void queue_regulatory_request(struct regulatory_request *request)
1694 if (isalpha(request->alpha2[0]))
1695 request->alpha2[0] = toupper(request->alpha2[0]);
1696 if (isalpha(request->alpha2[1]))
1697 request->alpha2[1] = toupper(request->alpha2[1]);
1699 spin_lock(®_requests_lock);
1700 list_add_tail(&request->list, ®_requests_list);
1701 spin_unlock(®_requests_lock);
1703 schedule_work(®_work);
1707 * Core regulatory hint -- happens during cfg80211_init()
1708 * and when we restore regulatory settings.
1710 static int regulatory_hint_core(const char *alpha2)
1712 struct regulatory_request *request;
1714 request = kzalloc(sizeof(struct regulatory_request),
1719 request->alpha2[0] = alpha2[0];
1720 request->alpha2[1] = alpha2[1];
1721 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1723 queue_regulatory_request(request);
1729 int regulatory_hint_user(const char *alpha2,
1730 enum nl80211_user_reg_hint_type user_reg_hint_type)
1732 struct regulatory_request *request;
1736 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1740 request->wiphy_idx = WIPHY_IDX_STALE;
1741 request->alpha2[0] = alpha2[0];
1742 request->alpha2[1] = alpha2[1];
1743 request->initiator = NL80211_REGDOM_SET_BY_USER;
1744 request->user_reg_hint_type = user_reg_hint_type;
1746 queue_regulatory_request(request);
1752 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1754 struct regulatory_request *request;
1759 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1763 request->wiphy_idx = get_wiphy_idx(wiphy);
1765 /* Must have registered wiphy first */
1766 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1768 request->alpha2[0] = alpha2[0];
1769 request->alpha2[1] = alpha2[1];
1770 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1772 queue_regulatory_request(request);
1776 EXPORT_SYMBOL(regulatory_hint);
1779 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1780 * therefore cannot iterate over the rdev list here.
1782 void regulatory_hint_11d(struct wiphy *wiphy,
1783 enum ieee80211_band band,
1788 enum environment_cap env = ENVIRON_ANY;
1789 struct regulatory_request *request;
1791 mutex_lock(®_mutex);
1793 if (unlikely(!last_request))
1796 /* IE len must be evenly divisible by 2 */
1797 if (country_ie_len & 0x01)
1800 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1803 alpha2[0] = country_ie[0];
1804 alpha2[1] = country_ie[1];
1806 if (country_ie[2] == 'I')
1807 env = ENVIRON_INDOOR;
1808 else if (country_ie[2] == 'O')
1809 env = ENVIRON_OUTDOOR;
1812 * We will run this only upon a successful connection on cfg80211.
1813 * We leave conflict resolution to the workqueue, where can hold
1816 if (likely(last_request->initiator ==
1817 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1818 wiphy_idx_valid(last_request->wiphy_idx)))
1821 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1825 request->wiphy_idx = get_wiphy_idx(wiphy);
1826 request->alpha2[0] = alpha2[0];
1827 request->alpha2[1] = alpha2[1];
1828 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1829 request->country_ie_env = env;
1831 mutex_unlock(®_mutex);
1833 queue_regulatory_request(request);
1838 mutex_unlock(®_mutex);
1841 static void restore_alpha2(char *alpha2, bool reset_user)
1843 /* indicates there is no alpha2 to consider for restoration */
1847 /* The user setting has precedence over the module parameter */
1848 if (is_user_regdom_saved()) {
1849 /* Unless we're asked to ignore it and reset it */
1851 REG_DBG_PRINT("Restoring regulatory settings "
1852 "including user preference\n");
1853 user_alpha2[0] = '9';
1854 user_alpha2[1] = '7';
1857 * If we're ignoring user settings, we still need to
1858 * check the module parameter to ensure we put things
1859 * back as they were for a full restore.
1861 if (!is_world_regdom(ieee80211_regdom)) {
1862 REG_DBG_PRINT("Keeping preference on "
1863 "module parameter ieee80211_regdom: %c%c\n",
1864 ieee80211_regdom[0],
1865 ieee80211_regdom[1]);
1866 alpha2[0] = ieee80211_regdom[0];
1867 alpha2[1] = ieee80211_regdom[1];
1870 REG_DBG_PRINT("Restoring regulatory settings "
1871 "while preserving user preference for: %c%c\n",
1874 alpha2[0] = user_alpha2[0];
1875 alpha2[1] = user_alpha2[1];
1877 } else if (!is_world_regdom(ieee80211_regdom)) {
1878 REG_DBG_PRINT("Keeping preference on "
1879 "module parameter ieee80211_regdom: %c%c\n",
1880 ieee80211_regdom[0],
1881 ieee80211_regdom[1]);
1882 alpha2[0] = ieee80211_regdom[0];
1883 alpha2[1] = ieee80211_regdom[1];
1885 REG_DBG_PRINT("Restoring regulatory settings\n");
1888 static void restore_custom_reg_settings(struct wiphy *wiphy)
1890 struct ieee80211_supported_band *sband;
1891 enum ieee80211_band band;
1892 struct ieee80211_channel *chan;
1895 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1896 sband = wiphy->bands[band];
1899 for (i = 0; i < sband->n_channels; i++) {
1900 chan = &sband->channels[i];
1901 chan->flags = chan->orig_flags;
1902 chan->max_antenna_gain = chan->orig_mag;
1903 chan->max_power = chan->orig_mpwr;
1904 chan->beacon_found = false;
1910 * Restoring regulatory settings involves ingoring any
1911 * possibly stale country IE information and user regulatory
1912 * settings if so desired, this includes any beacon hints
1913 * learned as we could have traveled outside to another country
1914 * after disconnection. To restore regulatory settings we do
1915 * exactly what we did at bootup:
1917 * - send a core regulatory hint
1918 * - send a user regulatory hint if applicable
1920 * Device drivers that send a regulatory hint for a specific country
1921 * keep their own regulatory domain on wiphy->regd so that does does
1922 * not need to be remembered.
1924 static void restore_regulatory_settings(bool reset_user)
1927 char world_alpha2[2];
1928 struct reg_beacon *reg_beacon, *btmp;
1929 struct regulatory_request *reg_request, *tmp;
1930 LIST_HEAD(tmp_reg_req_list);
1931 struct cfg80211_registered_device *rdev;
1933 mutex_lock(&cfg80211_mutex);
1934 mutex_lock(®_mutex);
1936 reset_regdomains(true);
1937 restore_alpha2(alpha2, reset_user);
1940 * If there's any pending requests we simply
1941 * stash them to a temporary pending queue and
1942 * add then after we've restored regulatory
1945 spin_lock(®_requests_lock);
1946 if (!list_empty(®_requests_list)) {
1947 list_for_each_entry_safe(reg_request, tmp,
1948 ®_requests_list, list) {
1949 if (reg_request->initiator !=
1950 NL80211_REGDOM_SET_BY_USER)
1952 list_move_tail(®_request->list, &tmp_reg_req_list);
1955 spin_unlock(®_requests_lock);
1957 /* Clear beacon hints */
1958 spin_lock_bh(®_pending_beacons_lock);
1959 if (!list_empty(®_pending_beacons)) {
1960 list_for_each_entry_safe(reg_beacon, btmp,
1961 ®_pending_beacons, list) {
1962 list_del(®_beacon->list);
1966 spin_unlock_bh(®_pending_beacons_lock);
1968 if (!list_empty(®_beacon_list)) {
1969 list_for_each_entry_safe(reg_beacon, btmp,
1970 ®_beacon_list, list) {
1971 list_del(®_beacon->list);
1976 /* First restore to the basic regulatory settings */
1977 cfg80211_regdomain = cfg80211_world_regdom;
1978 world_alpha2[0] = cfg80211_regdomain->alpha2[0];
1979 world_alpha2[1] = cfg80211_regdomain->alpha2[1];
1981 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1982 if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1983 restore_custom_reg_settings(&rdev->wiphy);
1986 mutex_unlock(®_mutex);
1987 mutex_unlock(&cfg80211_mutex);
1989 regulatory_hint_core(world_alpha2);
1992 * This restores the ieee80211_regdom module parameter
1993 * preference or the last user requested regulatory
1994 * settings, user regulatory settings takes precedence.
1996 if (is_an_alpha2(alpha2))
1997 regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
1999 if (list_empty(&tmp_reg_req_list))
2002 mutex_lock(&cfg80211_mutex);
2003 mutex_lock(®_mutex);
2005 spin_lock(®_requests_lock);
2006 list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) {
2007 REG_DBG_PRINT("Adding request for country %c%c back "
2009 reg_request->alpha2[0],
2010 reg_request->alpha2[1]);
2011 list_move_tail(®_request->list, ®_requests_list);
2013 spin_unlock(®_requests_lock);
2015 mutex_unlock(®_mutex);
2016 mutex_unlock(&cfg80211_mutex);
2018 REG_DBG_PRINT("Kicking the queue\n");
2020 schedule_work(®_work);
2023 void regulatory_hint_disconnect(void)
2025 REG_DBG_PRINT("All devices are disconnected, going to "
2026 "restore regulatory settings\n");
2027 restore_regulatory_settings(false);
2030 static bool freq_is_chan_12_13_14(u16 freq)
2032 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
2033 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
2034 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
2039 int regulatory_hint_found_beacon(struct wiphy *wiphy,
2040 struct ieee80211_channel *beacon_chan,
2043 struct reg_beacon *reg_beacon;
2045 if (likely((beacon_chan->beacon_found ||
2046 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
2047 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
2048 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
2051 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
2055 REG_DBG_PRINT("Found new beacon on "
2056 "frequency: %d MHz (Ch %d) on %s\n",
2057 beacon_chan->center_freq,
2058 ieee80211_frequency_to_channel(beacon_chan->center_freq),
2061 memcpy(®_beacon->chan, beacon_chan,
2062 sizeof(struct ieee80211_channel));
2066 * Since we can be called from BH or and non-BH context
2067 * we must use spin_lock_bh()
2069 spin_lock_bh(®_pending_beacons_lock);
2070 list_add_tail(®_beacon->list, ®_pending_beacons);
2071 spin_unlock_bh(®_pending_beacons_lock);
2073 schedule_work(®_work);
2078 static void print_rd_rules(const struct ieee80211_regdomain *rd)
2081 const struct ieee80211_reg_rule *reg_rule = NULL;
2082 const struct ieee80211_freq_range *freq_range = NULL;
2083 const struct ieee80211_power_rule *power_rule = NULL;
2085 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
2087 for (i = 0; i < rd->n_reg_rules; i++) {
2088 reg_rule = &rd->reg_rules[i];
2089 freq_range = ®_rule->freq_range;
2090 power_rule = ®_rule->power_rule;
2093 * There may not be documentation for max antenna gain
2094 * in certain regions
2096 if (power_rule->max_antenna_gain)
2097 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
2098 freq_range->start_freq_khz,
2099 freq_range->end_freq_khz,
2100 freq_range->max_bandwidth_khz,
2101 power_rule->max_antenna_gain,
2102 power_rule->max_eirp);
2104 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
2105 freq_range->start_freq_khz,
2106 freq_range->end_freq_khz,
2107 freq_range->max_bandwidth_khz,
2108 power_rule->max_eirp);
2112 bool reg_supported_dfs_region(u8 dfs_region)
2114 switch (dfs_region) {
2115 case NL80211_DFS_UNSET:
2116 case NL80211_DFS_FCC:
2117 case NL80211_DFS_ETSI:
2118 case NL80211_DFS_JP:
2121 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2127 static void print_dfs_region(u8 dfs_region)
2132 switch (dfs_region) {
2133 case NL80211_DFS_FCC:
2134 pr_info(" DFS Master region FCC");
2136 case NL80211_DFS_ETSI:
2137 pr_info(" DFS Master region ETSI");
2139 case NL80211_DFS_JP:
2140 pr_info(" DFS Master region JP");
2143 pr_info(" DFS Master region Uknown");
2148 static void print_regdomain(const struct ieee80211_regdomain *rd)
2151 if (is_intersected_alpha2(rd->alpha2)) {
2153 if (last_request->initiator ==
2154 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2155 struct cfg80211_registered_device *rdev;
2156 rdev = cfg80211_rdev_by_wiphy_idx(
2157 last_request->wiphy_idx);
2159 pr_info("Current regulatory domain updated by AP to: %c%c\n",
2160 rdev->country_ie_alpha2[0],
2161 rdev->country_ie_alpha2[1]);
2163 pr_info("Current regulatory domain intersected:\n");
2165 pr_info("Current regulatory domain intersected:\n");
2166 } else if (is_world_regdom(rd->alpha2))
2167 pr_info("World regulatory domain updated:\n");
2169 if (is_unknown_alpha2(rd->alpha2))
2170 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
2172 if (reg_request_cell_base(last_request))
2173 pr_info("Regulatory domain changed "
2174 "to country: %c%c by Cell Station\n",
2175 rd->alpha2[0], rd->alpha2[1]);
2177 pr_info("Regulatory domain changed "
2178 "to country: %c%c\n",
2179 rd->alpha2[0], rd->alpha2[1]);
2182 print_dfs_region(rd->dfs_region);
2186 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2188 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
2192 /* Takes ownership of rd only if it doesn't fail */
2193 static int __set_regdom(const struct ieee80211_regdomain *rd)
2195 const struct ieee80211_regdomain *intersected_rd = NULL;
2196 struct cfg80211_registered_device *rdev = NULL;
2197 struct wiphy *request_wiphy;
2198 /* Some basic sanity checks first */
2200 if (is_world_regdom(rd->alpha2)) {
2201 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2203 update_world_regdomain(rd);
2207 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2208 !is_unknown_alpha2(rd->alpha2))
2215 * Lets only bother proceeding on the same alpha2 if the current
2216 * rd is non static (it means CRDA was present and was used last)
2217 * and the pending request came in from a country IE
2219 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2221 * If someone else asked us to change the rd lets only bother
2222 * checking if the alpha2 changes if CRDA was already called
2224 if (!regdom_changes(rd->alpha2))
2229 * Now lets set the regulatory domain, update all driver channels
2230 * and finally inform them of what we have done, in case they want
2231 * to review or adjust their own settings based on their own
2232 * internal EEPROM data
2235 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2238 if (!is_valid_rd(rd)) {
2239 pr_err("Invalid regulatory domain detected:\n");
2240 print_regdomain_info(rd);
2244 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2245 if (!request_wiphy &&
2246 (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2247 last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) {
2248 schedule_delayed_work(®_timeout, 0);
2252 if (!last_request->intersect) {
2255 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
2256 reset_regdomains(false);
2257 cfg80211_regdomain = rd;
2262 * For a driver hint, lets copy the regulatory domain the
2263 * driver wanted to the wiphy to deal with conflicts
2267 * Userspace could have sent two replies with only
2268 * one kernel request.
2270 if (request_wiphy->regd)
2273 r = reg_copy_regd(&request_wiphy->regd, rd);
2277 reset_regdomains(false);
2278 cfg80211_regdomain = rd;
2282 /* Intersection requires a bit more work */
2284 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2286 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2287 if (!intersected_rd)
2291 * We can trash what CRDA provided now.
2292 * However if a driver requested this specific regulatory
2293 * domain we keep it for its private use
2295 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
2296 request_wiphy->regd = rd;
2302 reset_regdomains(false);
2303 cfg80211_regdomain = intersected_rd;
2308 if (!intersected_rd)
2311 rdev = wiphy_to_dev(request_wiphy);
2313 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2314 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2315 rdev->env = last_request->country_ie_env;
2317 BUG_ON(intersected_rd == rd);
2322 reset_regdomains(false);
2323 cfg80211_regdomain = intersected_rd;
2330 * Use this call to set the current regulatory domain. Conflicts with
2331 * multiple drivers can be ironed out later. Caller must've already
2332 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2334 int set_regdom(const struct ieee80211_regdomain *rd)
2338 assert_cfg80211_lock();
2340 mutex_lock(®_mutex);
2342 /* Note that this doesn't update the wiphys, this is done below */
2343 r = __set_regdom(rd);
2346 reg_set_request_processed();
2349 mutex_unlock(®_mutex);
2353 /* This would make this whole thing pointless */
2354 if (!last_request->intersect)
2355 BUG_ON(rd != cfg80211_regdomain);
2357 /* update all wiphys now with the new established regulatory domain */
2358 update_all_wiphy_regulatory(last_request->initiator);
2360 print_regdomain(cfg80211_regdomain);
2362 nl80211_send_reg_change_event(last_request);
2364 reg_set_request_processed();
2366 mutex_unlock(®_mutex);
2371 #ifdef CONFIG_HOTPLUG
2372 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2374 if (last_request && !last_request->processed) {
2375 if (add_uevent_var(env, "COUNTRY=%c%c",
2376 last_request->alpha2[0],
2377 last_request->alpha2[1]))
2384 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2388 #endif /* CONFIG_HOTPLUG */
2390 void wiphy_regulatory_register(struct wiphy *wiphy)
2392 assert_cfg80211_lock();
2394 mutex_lock(®_mutex);
2396 if (!reg_dev_ignore_cell_hint(wiphy))
2397 reg_num_devs_support_basehint++;
2399 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
2401 mutex_unlock(®_mutex);
2404 /* Caller must hold cfg80211_mutex */
2405 void wiphy_regulatory_deregister(struct wiphy *wiphy)
2407 struct wiphy *request_wiphy = NULL;
2409 assert_cfg80211_lock();
2411 mutex_lock(®_mutex);
2413 if (!reg_dev_ignore_cell_hint(wiphy))
2414 reg_num_devs_support_basehint--;
2419 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2421 if (!request_wiphy || request_wiphy != wiphy)
2424 last_request->wiphy_idx = WIPHY_IDX_STALE;
2425 last_request->country_ie_env = ENVIRON_ANY;
2427 mutex_unlock(®_mutex);
2430 static void reg_timeout_work(struct work_struct *work)
2432 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "
2433 "restoring regulatory settings\n");
2434 restore_regulatory_settings(true);
2437 int __init regulatory_init(void)
2441 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2442 if (IS_ERR(reg_pdev))
2443 return PTR_ERR(reg_pdev);
2445 reg_pdev->dev.type = ®_device_type;
2447 spin_lock_init(®_requests_lock);
2448 spin_lock_init(®_pending_beacons_lock);
2450 reg_regdb_size_check();
2452 cfg80211_regdomain = cfg80211_world_regdom;
2454 user_alpha2[0] = '9';
2455 user_alpha2[1] = '7';
2457 /* We always try to get an update for the static regdomain */
2458 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2463 * N.B. kobject_uevent_env() can fail mainly for when we're out
2464 * memory which is handled and propagated appropriately above
2465 * but it can also fail during a netlink_broadcast() or during
2466 * early boot for call_usermodehelper(). For now treat these
2467 * errors as non-fatal.
2469 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2470 #ifdef CONFIG_CFG80211_REG_DEBUG
2471 /* We want to find out exactly why when debugging */
2477 * Finally, if the user set the module parameter treat it
2480 if (!is_world_regdom(ieee80211_regdom))
2481 regulatory_hint_user(ieee80211_regdom,
2482 NL80211_USER_REG_HINT_USER);
2487 void /* __init_or_exit */ regulatory_exit(void)
2489 struct regulatory_request *reg_request, *tmp;
2490 struct reg_beacon *reg_beacon, *btmp;
2492 cancel_work_sync(®_work);
2493 cancel_delayed_work_sync(®_timeout);
2495 mutex_lock(&cfg80211_mutex);
2496 mutex_lock(®_mutex);
2498 reset_regdomains(true);
2500 dev_set_uevent_suppress(®_pdev->dev, true);
2502 platform_device_unregister(reg_pdev);
2504 spin_lock_bh(®_pending_beacons_lock);
2505 if (!list_empty(®_pending_beacons)) {
2506 list_for_each_entry_safe(reg_beacon, btmp,
2507 ®_pending_beacons, list) {
2508 list_del(®_beacon->list);
2512 spin_unlock_bh(®_pending_beacons_lock);
2514 if (!list_empty(®_beacon_list)) {
2515 list_for_each_entry_safe(reg_beacon, btmp,
2516 ®_beacon_list, list) {
2517 list_del(®_beacon->list);
2522 spin_lock(®_requests_lock);
2523 if (!list_empty(®_requests_list)) {
2524 list_for_each_entry_safe(reg_request, tmp,
2525 ®_requests_list, list) {
2526 list_del(®_request->list);
2530 spin_unlock(®_requests_lock);
2532 mutex_unlock(®_mutex);
2533 mutex_unlock(&cfg80211_mutex);