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/ctype.h>
52 #include <linux/nl80211.h>
53 #include <linux/platform_device.h>
54 #include <linux/moduleparam.h>
55 #include <net/cfg80211.h>
61 #ifdef CONFIG_CFG80211_REG_DEBUG
62 #define REG_DBG_PRINT(format, args...) \
63 printk(KERN_DEBUG pr_fmt(format), ##args)
65 #define REG_DBG_PRINT(args...)
68 enum reg_request_treatment {
75 static struct regulatory_request core_request_world = {
76 .initiator = NL80211_REGDOM_SET_BY_CORE,
81 .country_ie_env = ENVIRON_ANY,
85 * Receipt of information from last regulatory request,
86 * protected by RTNL (and can be accessed with RCU protection)
88 static struct regulatory_request __rcu *last_request =
89 (void __rcu *)&core_request_world;
91 /* To trigger userspace events */
92 static struct platform_device *reg_pdev;
94 static struct device_type reg_device_type = {
95 .uevent = reg_device_uevent,
99 * Central wireless core regulatory domains, we only need two,
100 * the current one and a world regulatory domain in case we have no
101 * information to give us an alpha2.
102 * (protected by RTNL, can be read under RCU)
104 const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
107 * Number of devices that registered to the core
108 * that support cellular base station regulatory hints
109 * (protected by RTNL)
111 static int reg_num_devs_support_basehint;
113 static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
115 return rtnl_dereference(cfg80211_regdomain);
118 static const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
120 return rtnl_dereference(wiphy->regd);
123 static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region)
125 switch (dfs_region) {
126 case NL80211_DFS_UNSET:
128 case NL80211_DFS_FCC:
130 case NL80211_DFS_ETSI:
138 enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy)
140 const struct ieee80211_regdomain *regd = NULL;
141 const struct ieee80211_regdomain *wiphy_regd = NULL;
143 regd = get_cfg80211_regdom();
147 wiphy_regd = get_wiphy_regdom(wiphy);
151 if (wiphy_regd->dfs_region == regd->dfs_region)
154 REG_DBG_PRINT("%s: device specific dfs_region "
155 "(%s) disagrees with cfg80211's "
156 "central dfs_region (%s)\n",
157 dev_name(&wiphy->dev),
158 reg_dfs_region_str(wiphy_regd->dfs_region),
159 reg_dfs_region_str(regd->dfs_region));
162 return regd->dfs_region;
165 static void rcu_free_regdom(const struct ieee80211_regdomain *r)
169 kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
172 static struct regulatory_request *get_last_request(void)
174 return rcu_dereference_rtnl(last_request);
177 /* Used to queue up regulatory hints */
178 static LIST_HEAD(reg_requests_list);
179 static spinlock_t reg_requests_lock;
181 /* Used to queue up beacon hints for review */
182 static LIST_HEAD(reg_pending_beacons);
183 static spinlock_t reg_pending_beacons_lock;
185 /* Used to keep track of processed beacon hints */
186 static LIST_HEAD(reg_beacon_list);
189 struct list_head list;
190 struct ieee80211_channel chan;
193 static void reg_todo(struct work_struct *work);
194 static DECLARE_WORK(reg_work, reg_todo);
196 static void reg_timeout_work(struct work_struct *work);
197 static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
199 /* We keep a static world regulatory domain in case of the absence of CRDA */
200 static const struct ieee80211_regdomain world_regdom = {
204 /* IEEE 802.11b/g, channels 1..11 */
205 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
206 /* IEEE 802.11b/g, channels 12..13. */
207 REG_RULE(2467-10, 2472+10, 40, 6, 20,
209 /* IEEE 802.11 channel 14 - Only JP enables
210 * this and for 802.11b only */
211 REG_RULE(2484-10, 2484+10, 20, 6, 20,
213 NL80211_RRF_NO_OFDM),
214 /* IEEE 802.11a, channel 36..48 */
215 REG_RULE(5180-10, 5240+10, 160, 6, 20,
218 /* IEEE 802.11a, channel 52..64 - DFS required */
219 REG_RULE(5260-10, 5320+10, 160, 6, 20,
223 /* IEEE 802.11a, channel 100..144 - DFS required */
224 REG_RULE(5500-10, 5720+10, 160, 6, 20,
228 /* IEEE 802.11a, channel 149..165 */
229 REG_RULE(5745-10, 5825+10, 80, 6, 20,
232 /* IEEE 802.11ad (60gHz), channels 1..3 */
233 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
237 /* protected by RTNL */
238 static const struct ieee80211_regdomain *cfg80211_world_regdom =
241 static char *ieee80211_regdom = "00";
242 static char user_alpha2[2];
244 module_param(ieee80211_regdom, charp, 0444);
245 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
247 static void reg_kfree_last_request(void)
249 struct regulatory_request *lr;
251 lr = get_last_request();
253 if (lr != &core_request_world && lr)
254 kfree_rcu(lr, rcu_head);
257 static void reg_update_last_request(struct regulatory_request *request)
259 reg_kfree_last_request();
260 rcu_assign_pointer(last_request, request);
263 static void reset_regdomains(bool full_reset,
264 const struct ieee80211_regdomain *new_regdom)
266 const struct ieee80211_regdomain *r;
270 r = get_cfg80211_regdom();
272 /* avoid freeing static information or freeing something twice */
273 if (r == cfg80211_world_regdom)
275 if (cfg80211_world_regdom == &world_regdom)
276 cfg80211_world_regdom = NULL;
277 if (r == &world_regdom)
281 rcu_free_regdom(cfg80211_world_regdom);
283 cfg80211_world_regdom = &world_regdom;
284 rcu_assign_pointer(cfg80211_regdomain, new_regdom);
289 reg_update_last_request(&core_request_world);
293 * Dynamic world regulatory domain requested by the wireless
294 * core upon initialization
296 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
298 struct regulatory_request *lr;
300 lr = get_last_request();
304 reset_regdomains(false, rd);
306 cfg80211_world_regdom = rd;
309 bool is_world_regdom(const char *alpha2)
313 return alpha2[0] == '0' && alpha2[1] == '0';
316 static bool is_alpha2_set(const char *alpha2)
320 return alpha2[0] && alpha2[1];
323 static bool is_unknown_alpha2(const char *alpha2)
328 * Special case where regulatory domain was built by driver
329 * but a specific alpha2 cannot be determined
331 return alpha2[0] == '9' && alpha2[1] == '9';
334 static bool is_intersected_alpha2(const char *alpha2)
339 * Special case where regulatory domain is the
340 * result of an intersection between two regulatory domain
343 return alpha2[0] == '9' && alpha2[1] == '8';
346 static bool is_an_alpha2(const char *alpha2)
350 return isalpha(alpha2[0]) && isalpha(alpha2[1]);
353 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
355 if (!alpha2_x || !alpha2_y)
357 return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
360 static bool regdom_changes(const char *alpha2)
362 const struct ieee80211_regdomain *r = get_cfg80211_regdom();
366 return !alpha2_equal(r->alpha2, alpha2);
370 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
371 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
372 * has ever been issued.
374 static bool is_user_regdom_saved(void)
376 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
379 /* This would indicate a mistake on the design */
380 if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
381 "Unexpected user alpha2: %c%c\n",
382 user_alpha2[0], user_alpha2[1]))
388 static const struct ieee80211_regdomain *
389 reg_copy_regd(const struct ieee80211_regdomain *src_regd)
391 struct ieee80211_regdomain *regd;
396 sizeof(struct ieee80211_regdomain) +
397 src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
399 regd = kzalloc(size_of_regd, GFP_KERNEL);
401 return ERR_PTR(-ENOMEM);
403 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
405 for (i = 0; i < src_regd->n_reg_rules; i++)
406 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
407 sizeof(struct ieee80211_reg_rule));
412 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
413 struct reg_regdb_search_request {
415 struct list_head list;
418 static LIST_HEAD(reg_regdb_search_list);
419 static DEFINE_MUTEX(reg_regdb_search_mutex);
421 static void reg_regdb_search(struct work_struct *work)
423 struct reg_regdb_search_request *request;
424 const struct ieee80211_regdomain *curdom, *regdom = NULL;
429 mutex_lock(®_regdb_search_mutex);
430 while (!list_empty(®_regdb_search_list)) {
431 request = list_first_entry(®_regdb_search_list,
432 struct reg_regdb_search_request,
434 list_del(&request->list);
436 for (i = 0; i < reg_regdb_size; i++) {
437 curdom = reg_regdb[i];
439 if (alpha2_equal(request->alpha2, curdom->alpha2)) {
440 regdom = reg_copy_regd(curdom);
447 mutex_unlock(®_regdb_search_mutex);
449 if (!IS_ERR_OR_NULL(regdom))
455 static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
457 static void reg_regdb_query(const char *alpha2)
459 struct reg_regdb_search_request *request;
464 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
468 memcpy(request->alpha2, alpha2, 2);
470 mutex_lock(®_regdb_search_mutex);
471 list_add_tail(&request->list, ®_regdb_search_list);
472 mutex_unlock(®_regdb_search_mutex);
474 schedule_work(®_regdb_work);
477 /* Feel free to add any other sanity checks here */
478 static void reg_regdb_size_check(void)
480 /* We should ideally BUILD_BUG_ON() but then random builds would fail */
481 WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
484 static inline void reg_regdb_size_check(void) {}
485 static inline void reg_regdb_query(const char *alpha2) {}
486 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
489 * This lets us keep regulatory code which is updated on a regulatory
490 * basis in userspace. Country information is filled in by
493 static int call_crda(const char *alpha2)
495 if (!is_world_regdom((char *) alpha2))
496 pr_info("Calling CRDA for country: %c%c\n",
497 alpha2[0], alpha2[1]);
499 pr_info("Calling CRDA to update world regulatory domain\n");
501 /* query internal regulatory database (if it exists) */
502 reg_regdb_query(alpha2);
504 return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE);
507 static enum reg_request_treatment
508 reg_call_crda(struct regulatory_request *request)
510 if (call_crda(request->alpha2))
511 return REG_REQ_IGNORE;
515 bool reg_is_valid_request(const char *alpha2)
517 struct regulatory_request *lr = get_last_request();
519 if (!lr || lr->processed)
522 return alpha2_equal(lr->alpha2, alpha2);
525 /* Sanity check on a regulatory rule */
526 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
528 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
531 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
534 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
537 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
539 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
540 freq_range->max_bandwidth_khz > freq_diff)
546 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
548 const struct ieee80211_reg_rule *reg_rule = NULL;
551 if (!rd->n_reg_rules)
554 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
557 for (i = 0; i < rd->n_reg_rules; i++) {
558 reg_rule = &rd->reg_rules[i];
559 if (!is_valid_reg_rule(reg_rule))
566 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
567 u32 center_freq_khz, u32 bw_khz)
569 u32 start_freq_khz, end_freq_khz;
571 start_freq_khz = center_freq_khz - (bw_khz/2);
572 end_freq_khz = center_freq_khz + (bw_khz/2);
574 if (start_freq_khz >= freq_range->start_freq_khz &&
575 end_freq_khz <= freq_range->end_freq_khz)
582 * freq_in_rule_band - tells us if a frequency is in a frequency band
583 * @freq_range: frequency rule we want to query
584 * @freq_khz: frequency we are inquiring about
586 * This lets us know if a specific frequency rule is or is not relevant to
587 * a specific frequency's band. Bands are device specific and artificial
588 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
589 * however it is safe for now to assume that a frequency rule should not be
590 * part of a frequency's band if the start freq or end freq are off by more
591 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
593 * This resolution can be lowered and should be considered as we add
594 * regulatory rule support for other "bands".
596 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
599 #define ONE_GHZ_IN_KHZ 1000000
601 * From 802.11ad: directional multi-gigabit (DMG):
602 * Pertaining to operation in a frequency band containing a channel
603 * with the Channel starting frequency above 45 GHz.
605 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
606 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
607 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
609 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
612 #undef ONE_GHZ_IN_KHZ
616 * Later on we can perhaps use the more restrictive DFS
617 * region but we don't have information for that yet so
618 * for now simply disallow conflicts.
620 static enum nl80211_dfs_regions
621 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
622 const enum nl80211_dfs_regions dfs_region2)
624 if (dfs_region1 != dfs_region2)
625 return NL80211_DFS_UNSET;
630 * Helper for regdom_intersect(), this does the real
631 * mathematical intersection fun
633 static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,
634 const struct ieee80211_reg_rule *rule2,
635 struct ieee80211_reg_rule *intersected_rule)
637 const struct ieee80211_freq_range *freq_range1, *freq_range2;
638 struct ieee80211_freq_range *freq_range;
639 const struct ieee80211_power_rule *power_rule1, *power_rule2;
640 struct ieee80211_power_rule *power_rule;
643 freq_range1 = &rule1->freq_range;
644 freq_range2 = &rule2->freq_range;
645 freq_range = &intersected_rule->freq_range;
647 power_rule1 = &rule1->power_rule;
648 power_rule2 = &rule2->power_rule;
649 power_rule = &intersected_rule->power_rule;
651 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
652 freq_range2->start_freq_khz);
653 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
654 freq_range2->end_freq_khz);
655 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
656 freq_range2->max_bandwidth_khz);
658 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
659 if (freq_range->max_bandwidth_khz > freq_diff)
660 freq_range->max_bandwidth_khz = freq_diff;
662 power_rule->max_eirp = min(power_rule1->max_eirp,
663 power_rule2->max_eirp);
664 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
665 power_rule2->max_antenna_gain);
667 intersected_rule->flags = rule1->flags | rule2->flags;
669 if (!is_valid_reg_rule(intersected_rule))
676 * regdom_intersect - do the intersection between two regulatory domains
677 * @rd1: first regulatory domain
678 * @rd2: second regulatory domain
680 * Use this function to get the intersection between two regulatory domains.
681 * Once completed we will mark the alpha2 for the rd as intersected, "98",
682 * as no one single alpha2 can represent this regulatory domain.
684 * Returns a pointer to the regulatory domain structure which will hold the
685 * resulting intersection of rules between rd1 and rd2. We will
686 * kzalloc() this structure for you.
688 static struct ieee80211_regdomain *
689 regdom_intersect(const struct ieee80211_regdomain *rd1,
690 const struct ieee80211_regdomain *rd2)
694 unsigned int num_rules = 0, rule_idx = 0;
695 const struct ieee80211_reg_rule *rule1, *rule2;
696 struct ieee80211_reg_rule *intersected_rule;
697 struct ieee80211_regdomain *rd;
698 /* This is just a dummy holder to help us count */
699 struct ieee80211_reg_rule dummy_rule;
705 * First we get a count of the rules we'll need, then we actually
706 * build them. This is to so we can malloc() and free() a
707 * regdomain once. The reason we use reg_rules_intersect() here
708 * is it will return -EINVAL if the rule computed makes no sense.
709 * All rules that do check out OK are valid.
712 for (x = 0; x < rd1->n_reg_rules; x++) {
713 rule1 = &rd1->reg_rules[x];
714 for (y = 0; y < rd2->n_reg_rules; y++) {
715 rule2 = &rd2->reg_rules[y];
716 if (!reg_rules_intersect(rule1, rule2, &dummy_rule))
724 size_of_regd = sizeof(struct ieee80211_regdomain) +
725 num_rules * sizeof(struct ieee80211_reg_rule);
727 rd = kzalloc(size_of_regd, GFP_KERNEL);
731 for (x = 0; x < rd1->n_reg_rules && rule_idx < num_rules; x++) {
732 rule1 = &rd1->reg_rules[x];
733 for (y = 0; y < rd2->n_reg_rules && rule_idx < num_rules; y++) {
734 rule2 = &rd2->reg_rules[y];
736 * This time around instead of using the stack lets
737 * write to the target rule directly saving ourselves
740 intersected_rule = &rd->reg_rules[rule_idx];
741 r = reg_rules_intersect(rule1, rule2, intersected_rule);
743 * No need to memset here the intersected rule here as
744 * we're not using the stack anymore
752 if (rule_idx != num_rules) {
757 rd->n_reg_rules = num_rules;
760 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
767 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
768 * want to just have the channel structure use these
770 static u32 map_regdom_flags(u32 rd_flags)
772 u32 channel_flags = 0;
773 if (rd_flags & NL80211_RRF_NO_IR_ALL)
774 channel_flags |= IEEE80211_CHAN_NO_IR;
775 if (rd_flags & NL80211_RRF_DFS)
776 channel_flags |= IEEE80211_CHAN_RADAR;
777 if (rd_flags & NL80211_RRF_NO_OFDM)
778 channel_flags |= IEEE80211_CHAN_NO_OFDM;
779 return channel_flags;
782 static const struct ieee80211_reg_rule *
783 freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq,
784 const struct ieee80211_regdomain *regd)
787 bool band_rule_found = false;
788 bool bw_fits = false;
791 return ERR_PTR(-EINVAL);
793 for (i = 0; i < regd->n_reg_rules; i++) {
794 const struct ieee80211_reg_rule *rr;
795 const struct ieee80211_freq_range *fr = NULL;
797 rr = ®d->reg_rules[i];
798 fr = &rr->freq_range;
801 * We only need to know if one frequency rule was
802 * was in center_freq's band, that's enough, so lets
803 * not overwrite it once found
805 if (!band_rule_found)
806 band_rule_found = freq_in_rule_band(fr, center_freq);
808 bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20));
810 if (band_rule_found && bw_fits)
814 if (!band_rule_found)
815 return ERR_PTR(-ERANGE);
817 return ERR_PTR(-EINVAL);
820 const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
823 const struct ieee80211_regdomain *regd;
824 struct regulatory_request *lr = get_last_request();
827 * Follow the driver's regulatory domain, if present, unless a country
828 * IE has been processed or a user wants to help complaince further
830 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
831 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
833 regd = get_wiphy_regdom(wiphy);
835 regd = get_cfg80211_regdom();
837 return freq_reg_info_regd(wiphy, center_freq, regd);
839 EXPORT_SYMBOL(freq_reg_info);
841 const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
844 case NL80211_REGDOM_SET_BY_CORE:
846 case NL80211_REGDOM_SET_BY_USER:
848 case NL80211_REGDOM_SET_BY_DRIVER:
850 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
857 EXPORT_SYMBOL(reg_initiator_name);
859 #ifdef CONFIG_CFG80211_REG_DEBUG
860 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
861 const struct ieee80211_reg_rule *reg_rule)
863 const struct ieee80211_power_rule *power_rule;
864 const struct ieee80211_freq_range *freq_range;
865 char max_antenna_gain[32];
867 power_rule = ®_rule->power_rule;
868 freq_range = ®_rule->freq_range;
870 if (!power_rule->max_antenna_gain)
871 snprintf(max_antenna_gain, 32, "N/A");
873 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
875 REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
878 REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
879 freq_range->start_freq_khz, freq_range->end_freq_khz,
880 freq_range->max_bandwidth_khz, max_antenna_gain,
881 power_rule->max_eirp);
884 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
885 const struct ieee80211_reg_rule *reg_rule)
892 * Note that right now we assume the desired channel bandwidth
893 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
894 * per channel, the primary and the extension channel).
896 static void handle_channel(struct wiphy *wiphy,
897 enum nl80211_reg_initiator initiator,
898 struct ieee80211_channel *chan)
900 u32 flags, bw_flags = 0;
901 const struct ieee80211_reg_rule *reg_rule = NULL;
902 const struct ieee80211_power_rule *power_rule = NULL;
903 const struct ieee80211_freq_range *freq_range = NULL;
904 struct wiphy *request_wiphy = NULL;
905 struct regulatory_request *lr = get_last_request();
907 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
909 flags = chan->orig_flags;
911 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
912 if (IS_ERR(reg_rule)) {
914 * We will disable all channels that do not match our
915 * received regulatory rule unless the hint is coming
916 * from a Country IE and the Country IE had no information
917 * about a band. The IEEE 802.11 spec allows for an AP
918 * to send only a subset of the regulatory rules allowed,
919 * so an AP in the US that only supports 2.4 GHz may only send
920 * a country IE with information for the 2.4 GHz band
921 * while 5 GHz is still supported.
923 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
924 PTR_ERR(reg_rule) == -ERANGE)
927 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
928 request_wiphy && request_wiphy == wiphy &&
929 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
930 REG_DBG_PRINT("Disabling freq %d MHz for good\n",
932 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
933 chan->flags = chan->orig_flags;
935 REG_DBG_PRINT("Disabling freq %d MHz\n",
937 chan->flags |= IEEE80211_CHAN_DISABLED;
942 chan_reg_rule_print_dbg(chan, reg_rule);
944 power_rule = ®_rule->power_rule;
945 freq_range = ®_rule->freq_range;
947 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
948 bw_flags = IEEE80211_CHAN_NO_HT40;
949 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))
950 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
951 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))
952 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
954 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
955 request_wiphy && request_wiphy == wiphy &&
956 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
958 * This guarantees the driver's requested regulatory domain
959 * will always be used as a base for further regulatory
962 chan->flags = chan->orig_flags =
963 map_regdom_flags(reg_rule->flags) | bw_flags;
964 chan->max_antenna_gain = chan->orig_mag =
965 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
966 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
967 (int) MBM_TO_DBM(power_rule->max_eirp);
971 chan->dfs_state = NL80211_DFS_USABLE;
972 chan->dfs_state_entered = jiffies;
974 chan->beacon_found = false;
975 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
976 chan->max_antenna_gain =
977 min_t(int, chan->orig_mag,
978 MBI_TO_DBI(power_rule->max_antenna_gain));
979 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
980 if (chan->orig_mpwr) {
982 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
983 * will always follow the passed country IE power settings.
985 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
986 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
987 chan->max_power = chan->max_reg_power;
989 chan->max_power = min(chan->orig_mpwr,
990 chan->max_reg_power);
992 chan->max_power = chan->max_reg_power;
995 static void handle_band(struct wiphy *wiphy,
996 enum nl80211_reg_initiator initiator,
997 struct ieee80211_supported_band *sband)
1004 for (i = 0; i < sband->n_channels; i++)
1005 handle_channel(wiphy, initiator, &sband->channels[i]);
1008 static bool reg_request_cell_base(struct regulatory_request *request)
1010 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1012 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1015 bool reg_last_request_cell_base(void)
1017 return reg_request_cell_base(get_last_request());
1020 #ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
1021 /* Core specific check */
1022 static enum reg_request_treatment
1023 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1025 struct regulatory_request *lr = get_last_request();
1027 if (!reg_num_devs_support_basehint)
1028 return REG_REQ_IGNORE;
1030 if (reg_request_cell_base(lr) &&
1031 !regdom_changes(pending_request->alpha2))
1032 return REG_REQ_ALREADY_SET;
1037 /* Device specific check */
1038 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1040 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1043 static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
1045 return REG_REQ_IGNORE;
1048 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1054 static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1056 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1057 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1062 static bool ignore_reg_update(struct wiphy *wiphy,
1063 enum nl80211_reg_initiator initiator)
1065 struct regulatory_request *lr = get_last_request();
1068 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1069 "since last_request is not set\n",
1070 reg_initiator_name(initiator));
1074 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1075 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1076 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1077 "since the driver uses its own custom "
1078 "regulatory domain\n",
1079 reg_initiator_name(initiator));
1084 * wiphy->regd will be set once the device has its own
1085 * desired regulatory domain set
1087 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1088 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1089 !is_world_regdom(lr->alpha2)) {
1090 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1091 "since the driver requires its own regulatory "
1092 "domain to be set first\n",
1093 reg_initiator_name(initiator));
1097 if (reg_request_cell_base(lr))
1098 return reg_dev_ignore_cell_hint(wiphy);
1103 static bool reg_is_world_roaming(struct wiphy *wiphy)
1105 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1106 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1107 struct regulatory_request *lr = get_last_request();
1109 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1112 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1113 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1119 static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1120 struct reg_beacon *reg_beacon)
1122 struct ieee80211_supported_band *sband;
1123 struct ieee80211_channel *chan;
1124 bool channel_changed = false;
1125 struct ieee80211_channel chan_before;
1127 sband = wiphy->bands[reg_beacon->chan.band];
1128 chan = &sband->channels[chan_idx];
1130 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1133 if (chan->beacon_found)
1136 chan->beacon_found = true;
1138 if (!reg_is_world_roaming(wiphy))
1141 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1144 chan_before.center_freq = chan->center_freq;
1145 chan_before.flags = chan->flags;
1147 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1148 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1149 channel_changed = true;
1152 if (channel_changed)
1153 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1157 * Called when a scan on a wiphy finds a beacon on
1160 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1161 struct reg_beacon *reg_beacon)
1164 struct ieee80211_supported_band *sband;
1166 if (!wiphy->bands[reg_beacon->chan.band])
1169 sband = wiphy->bands[reg_beacon->chan.band];
1171 for (i = 0; i < sband->n_channels; i++)
1172 handle_reg_beacon(wiphy, i, reg_beacon);
1176 * Called upon reg changes or a new wiphy is added
1178 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1181 struct ieee80211_supported_band *sband;
1182 struct reg_beacon *reg_beacon;
1184 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1185 if (!wiphy->bands[reg_beacon->chan.band])
1187 sband = wiphy->bands[reg_beacon->chan.band];
1188 for (i = 0; i < sband->n_channels; i++)
1189 handle_reg_beacon(wiphy, i, reg_beacon);
1193 /* Reap the advantages of previously found beacons */
1194 static void reg_process_beacons(struct wiphy *wiphy)
1197 * Means we are just firing up cfg80211, so no beacons would
1198 * have been processed yet.
1202 wiphy_update_beacon_reg(wiphy);
1205 static bool is_ht40_allowed(struct ieee80211_channel *chan)
1209 if (chan->flags & IEEE80211_CHAN_DISABLED)
1211 /* This would happen when regulatory rules disallow HT40 completely */
1212 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
1217 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1218 struct ieee80211_channel *channel)
1220 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
1221 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1224 if (!is_ht40_allowed(channel)) {
1225 channel->flags |= IEEE80211_CHAN_NO_HT40;
1230 * We need to ensure the extension channels exist to
1231 * be able to use HT40- or HT40+, this finds them (or not)
1233 for (i = 0; i < sband->n_channels; i++) {
1234 struct ieee80211_channel *c = &sband->channels[i];
1236 if (c->center_freq == (channel->center_freq - 20))
1238 if (c->center_freq == (channel->center_freq + 20))
1243 * Please note that this assumes target bandwidth is 20 MHz,
1244 * if that ever changes we also need to change the below logic
1245 * to include that as well.
1247 if (!is_ht40_allowed(channel_before))
1248 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1250 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1252 if (!is_ht40_allowed(channel_after))
1253 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1255 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1258 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1259 struct ieee80211_supported_band *sband)
1266 for (i = 0; i < sband->n_channels; i++)
1267 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
1270 static void reg_process_ht_flags(struct wiphy *wiphy)
1272 enum ieee80211_band band;
1277 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1278 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
1281 static void reg_call_notifier(struct wiphy *wiphy,
1282 struct regulatory_request *request)
1284 if (wiphy->reg_notifier)
1285 wiphy->reg_notifier(wiphy, request);
1288 static void wiphy_update_regulatory(struct wiphy *wiphy,
1289 enum nl80211_reg_initiator initiator)
1291 enum ieee80211_band band;
1292 struct regulatory_request *lr = get_last_request();
1294 if (ignore_reg_update(wiphy, initiator)) {
1296 * Regulatory updates set by CORE are ignored for custom
1297 * regulatory cards. Let us notify the changes to the driver,
1298 * as some drivers used this to restore its orig_* reg domain.
1300 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1301 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1302 reg_call_notifier(wiphy, lr);
1306 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
1308 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1309 handle_band(wiphy, initiator, wiphy->bands[band]);
1311 reg_process_beacons(wiphy);
1312 reg_process_ht_flags(wiphy);
1313 reg_call_notifier(wiphy, lr);
1316 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1318 struct cfg80211_registered_device *rdev;
1319 struct wiphy *wiphy;
1323 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1324 wiphy = &rdev->wiphy;
1325 wiphy_update_regulatory(wiphy, initiator);
1329 static void handle_channel_custom(struct wiphy *wiphy,
1330 struct ieee80211_channel *chan,
1331 const struct ieee80211_regdomain *regd)
1334 const struct ieee80211_reg_rule *reg_rule = NULL;
1335 const struct ieee80211_power_rule *power_rule = NULL;
1336 const struct ieee80211_freq_range *freq_range = NULL;
1338 reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1341 if (IS_ERR(reg_rule)) {
1342 REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1344 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1345 chan->flags = chan->orig_flags;
1349 chan_reg_rule_print_dbg(chan, reg_rule);
1351 power_rule = ®_rule->power_rule;
1352 freq_range = ®_rule->freq_range;
1354 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1355 bw_flags = IEEE80211_CHAN_NO_HT40;
1356 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))
1357 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1358 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))
1359 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1361 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1362 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1363 chan->max_reg_power = chan->max_power =
1364 (int) MBM_TO_DBM(power_rule->max_eirp);
1367 static void handle_band_custom(struct wiphy *wiphy,
1368 struct ieee80211_supported_band *sband,
1369 const struct ieee80211_regdomain *regd)
1376 for (i = 0; i < sband->n_channels; i++)
1377 handle_channel_custom(wiphy, &sband->channels[i], regd);
1380 /* Used by drivers prior to wiphy registration */
1381 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1382 const struct ieee80211_regdomain *regd)
1384 enum ieee80211_band band;
1385 unsigned int bands_set = 0;
1387 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
1388 "wiphy should have REGULATORY_CUSTOM_REG\n");
1389 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
1391 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1392 if (!wiphy->bands[band])
1394 handle_band_custom(wiphy, wiphy->bands[band], regd);
1399 * no point in calling this if it won't have any effect
1400 * on your device's supported bands.
1402 WARN_ON(!bands_set);
1404 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1406 static void reg_set_request_processed(void)
1408 bool need_more_processing = false;
1409 struct regulatory_request *lr = get_last_request();
1411 lr->processed = true;
1413 spin_lock(®_requests_lock);
1414 if (!list_empty(®_requests_list))
1415 need_more_processing = true;
1416 spin_unlock(®_requests_lock);
1418 if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
1419 cancel_delayed_work(®_timeout);
1421 if (need_more_processing)
1422 schedule_work(®_work);
1426 * reg_process_hint_core - process core regulatory requests
1427 * @pending_request: a pending core regulatory request
1429 * The wireless subsystem can use this function to process
1430 * a regulatory request issued by the regulatory core.
1432 * Returns one of the different reg request treatment values.
1434 static enum reg_request_treatment
1435 reg_process_hint_core(struct regulatory_request *core_request)
1438 core_request->intersect = false;
1439 core_request->processed = false;
1441 reg_update_last_request(core_request);
1443 return reg_call_crda(core_request);
1446 static enum reg_request_treatment
1447 __reg_process_hint_user(struct regulatory_request *user_request)
1449 struct regulatory_request *lr = get_last_request();
1451 if (reg_request_cell_base(user_request))
1452 return reg_ignore_cell_hint(user_request);
1454 if (reg_request_cell_base(lr))
1455 return REG_REQ_IGNORE;
1457 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1458 return REG_REQ_INTERSECT;
1460 * If the user knows better the user should set the regdom
1461 * to their country before the IE is picked up
1463 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
1465 return REG_REQ_IGNORE;
1467 * Process user requests only after previous user/driver/core
1468 * requests have been processed
1470 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
1471 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1472 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
1473 regdom_changes(lr->alpha2))
1474 return REG_REQ_IGNORE;
1476 if (!regdom_changes(user_request->alpha2))
1477 return REG_REQ_ALREADY_SET;
1483 * reg_process_hint_user - process user regulatory requests
1484 * @user_request: a pending user regulatory request
1486 * The wireless subsystem can use this function to process
1487 * a regulatory request initiated by userspace.
1489 * Returns one of the different reg request treatment values.
1491 static enum reg_request_treatment
1492 reg_process_hint_user(struct regulatory_request *user_request)
1494 enum reg_request_treatment treatment;
1496 treatment = __reg_process_hint_user(user_request);
1497 if (treatment == REG_REQ_IGNORE ||
1498 treatment == REG_REQ_ALREADY_SET) {
1499 kfree(user_request);
1503 user_request->intersect = treatment == REG_REQ_INTERSECT;
1504 user_request->processed = false;
1506 reg_update_last_request(user_request);
1508 user_alpha2[0] = user_request->alpha2[0];
1509 user_alpha2[1] = user_request->alpha2[1];
1511 return reg_call_crda(user_request);
1514 static enum reg_request_treatment
1515 __reg_process_hint_driver(struct regulatory_request *driver_request)
1517 struct regulatory_request *lr = get_last_request();
1519 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
1520 if (regdom_changes(driver_request->alpha2))
1522 return REG_REQ_ALREADY_SET;
1526 * This would happen if you unplug and plug your card
1527 * back in or if you add a new device for which the previously
1528 * loaded card also agrees on the regulatory domain.
1530 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1531 !regdom_changes(driver_request->alpha2))
1532 return REG_REQ_ALREADY_SET;
1534 return REG_REQ_INTERSECT;
1538 * reg_process_hint_driver - process driver regulatory requests
1539 * @driver_request: a pending driver regulatory request
1541 * The wireless subsystem can use this function to process
1542 * a regulatory request issued by an 802.11 driver.
1544 * Returns one of the different reg request treatment values.
1546 static enum reg_request_treatment
1547 reg_process_hint_driver(struct wiphy *wiphy,
1548 struct regulatory_request *driver_request)
1550 const struct ieee80211_regdomain *regd;
1551 enum reg_request_treatment treatment;
1553 treatment = __reg_process_hint_driver(driver_request);
1555 switch (treatment) {
1558 case REG_REQ_IGNORE:
1559 kfree(driver_request);
1561 case REG_REQ_INTERSECT:
1563 case REG_REQ_ALREADY_SET:
1564 regd = reg_copy_regd(get_cfg80211_regdom());
1566 kfree(driver_request);
1567 return REG_REQ_IGNORE;
1569 rcu_assign_pointer(wiphy->regd, regd);
1573 driver_request->intersect = treatment == REG_REQ_INTERSECT;
1574 driver_request->processed = false;
1576 reg_update_last_request(driver_request);
1579 * Since CRDA will not be called in this case as we already
1580 * have applied the requested regulatory domain before we just
1581 * inform userspace we have processed the request
1583 if (treatment == REG_REQ_ALREADY_SET) {
1584 nl80211_send_reg_change_event(driver_request);
1585 reg_set_request_processed();
1589 return reg_call_crda(driver_request);
1592 static enum reg_request_treatment
1593 __reg_process_hint_country_ie(struct wiphy *wiphy,
1594 struct regulatory_request *country_ie_request)
1596 struct wiphy *last_wiphy = NULL;
1597 struct regulatory_request *lr = get_last_request();
1599 if (reg_request_cell_base(lr)) {
1600 /* Trust a Cell base station over the AP's country IE */
1601 if (regdom_changes(country_ie_request->alpha2))
1602 return REG_REQ_IGNORE;
1603 return REG_REQ_ALREADY_SET;
1605 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
1606 return REG_REQ_IGNORE;
1609 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
1612 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
1615 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1617 if (last_wiphy != wiphy) {
1619 * Two cards with two APs claiming different
1620 * Country IE alpha2s. We could
1621 * intersect them, but that seems unlikely
1622 * to be correct. Reject second one for now.
1624 if (regdom_changes(country_ie_request->alpha2))
1625 return REG_REQ_IGNORE;
1626 return REG_REQ_ALREADY_SET;
1629 * Two consecutive Country IE hints on the same wiphy.
1630 * This should be picked up early by the driver/stack
1632 if (WARN_ON(regdom_changes(country_ie_request->alpha2)))
1634 return REG_REQ_ALREADY_SET;
1638 * reg_process_hint_country_ie - process regulatory requests from country IEs
1639 * @country_ie_request: a regulatory request from a country IE
1641 * The wireless subsystem can use this function to process
1642 * a regulatory request issued by a country Information Element.
1644 * Returns one of the different reg request treatment values.
1646 static enum reg_request_treatment
1647 reg_process_hint_country_ie(struct wiphy *wiphy,
1648 struct regulatory_request *country_ie_request)
1650 enum reg_request_treatment treatment;
1652 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
1654 switch (treatment) {
1657 case REG_REQ_IGNORE:
1659 case REG_REQ_ALREADY_SET:
1660 kfree(country_ie_request);
1662 case REG_REQ_INTERSECT:
1663 kfree(country_ie_request);
1665 * This doesn't happen yet, not sure we
1666 * ever want to support it for this case.
1668 WARN_ONCE(1, "Unexpected intersection for country IEs");
1669 return REG_REQ_IGNORE;
1672 country_ie_request->intersect = false;
1673 country_ie_request->processed = false;
1675 reg_update_last_request(country_ie_request);
1677 return reg_call_crda(country_ie_request);
1680 /* This processes *all* regulatory hints */
1681 static void reg_process_hint(struct regulatory_request *reg_request)
1683 struct wiphy *wiphy = NULL;
1684 enum reg_request_treatment treatment;
1686 if (WARN_ON(!reg_request->alpha2))
1689 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
1690 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1692 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && !wiphy) {
1697 switch (reg_request->initiator) {
1698 case NL80211_REGDOM_SET_BY_CORE:
1699 reg_process_hint_core(reg_request);
1701 case NL80211_REGDOM_SET_BY_USER:
1702 treatment = reg_process_hint_user(reg_request);
1703 if (treatment == REG_REQ_OK ||
1704 treatment == REG_REQ_ALREADY_SET)
1706 schedule_delayed_work(®_timeout, msecs_to_jiffies(3142));
1708 case NL80211_REGDOM_SET_BY_DRIVER:
1709 treatment = reg_process_hint_driver(wiphy, reg_request);
1711 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1712 treatment = reg_process_hint_country_ie(wiphy, reg_request);
1715 WARN(1, "invalid initiator %d\n", reg_request->initiator);
1719 /* This is required so that the orig_* parameters are saved */
1720 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
1721 wiphy->regulatory_flags & REGULATORY_STRICT_REG)
1722 wiphy_update_regulatory(wiphy, reg_request->initiator);
1726 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1727 * Regulatory hints come on a first come first serve basis and we
1728 * must process each one atomically.
1730 static void reg_process_pending_hints(void)
1732 struct regulatory_request *reg_request, *lr;
1734 lr = get_last_request();
1736 /* When last_request->processed becomes true this will be rescheduled */
1737 if (lr && !lr->processed) {
1738 REG_DBG_PRINT("Pending regulatory request, waiting for it to be processed...\n");
1742 spin_lock(®_requests_lock);
1744 if (list_empty(®_requests_list)) {
1745 spin_unlock(®_requests_lock);
1749 reg_request = list_first_entry(®_requests_list,
1750 struct regulatory_request,
1752 list_del_init(®_request->list);
1754 spin_unlock(®_requests_lock);
1756 reg_process_hint(reg_request);
1759 /* Processes beacon hints -- this has nothing to do with country IEs */
1760 static void reg_process_pending_beacon_hints(void)
1762 struct cfg80211_registered_device *rdev;
1763 struct reg_beacon *pending_beacon, *tmp;
1765 /* This goes through the _pending_ beacon list */
1766 spin_lock_bh(®_pending_beacons_lock);
1768 list_for_each_entry_safe(pending_beacon, tmp,
1769 ®_pending_beacons, list) {
1770 list_del_init(&pending_beacon->list);
1772 /* Applies the beacon hint to current wiphys */
1773 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1774 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1776 /* Remembers the beacon hint for new wiphys or reg changes */
1777 list_add_tail(&pending_beacon->list, ®_beacon_list);
1780 spin_unlock_bh(®_pending_beacons_lock);
1783 static void reg_todo(struct work_struct *work)
1786 reg_process_pending_hints();
1787 reg_process_pending_beacon_hints();
1791 static void queue_regulatory_request(struct regulatory_request *request)
1793 request->alpha2[0] = toupper(request->alpha2[0]);
1794 request->alpha2[1] = toupper(request->alpha2[1]);
1796 spin_lock(®_requests_lock);
1797 list_add_tail(&request->list, ®_requests_list);
1798 spin_unlock(®_requests_lock);
1800 schedule_work(®_work);
1804 * Core regulatory hint -- happens during cfg80211_init()
1805 * and when we restore regulatory settings.
1807 static int regulatory_hint_core(const char *alpha2)
1809 struct regulatory_request *request;
1811 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1815 request->alpha2[0] = alpha2[0];
1816 request->alpha2[1] = alpha2[1];
1817 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1819 queue_regulatory_request(request);
1825 int regulatory_hint_user(const char *alpha2,
1826 enum nl80211_user_reg_hint_type user_reg_hint_type)
1828 struct regulatory_request *request;
1830 if (WARN_ON(!alpha2))
1833 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1837 request->wiphy_idx = WIPHY_IDX_INVALID;
1838 request->alpha2[0] = alpha2[0];
1839 request->alpha2[1] = alpha2[1];
1840 request->initiator = NL80211_REGDOM_SET_BY_USER;
1841 request->user_reg_hint_type = user_reg_hint_type;
1843 queue_regulatory_request(request);
1849 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1851 struct regulatory_request *request;
1853 if (WARN_ON(!alpha2 || !wiphy))
1856 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
1858 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1862 request->wiphy_idx = get_wiphy_idx(wiphy);
1864 request->alpha2[0] = alpha2[0];
1865 request->alpha2[1] = alpha2[1];
1866 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1868 queue_regulatory_request(request);
1872 EXPORT_SYMBOL(regulatory_hint);
1874 void regulatory_hint_country_ie(struct wiphy *wiphy, enum ieee80211_band band,
1875 const u8 *country_ie, u8 country_ie_len)
1878 enum environment_cap env = ENVIRON_ANY;
1879 struct regulatory_request *request = NULL, *lr;
1881 /* IE len must be evenly divisible by 2 */
1882 if (country_ie_len & 0x01)
1885 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1888 request = kzalloc(sizeof(*request), GFP_KERNEL);
1892 alpha2[0] = country_ie[0];
1893 alpha2[1] = country_ie[1];
1895 if (country_ie[2] == 'I')
1896 env = ENVIRON_INDOOR;
1897 else if (country_ie[2] == 'O')
1898 env = ENVIRON_OUTDOOR;
1901 lr = get_last_request();
1907 * We will run this only upon a successful connection on cfg80211.
1908 * We leave conflict resolution to the workqueue, where can hold
1911 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1912 lr->wiphy_idx != WIPHY_IDX_INVALID)
1915 request->wiphy_idx = get_wiphy_idx(wiphy);
1916 request->alpha2[0] = alpha2[0];
1917 request->alpha2[1] = alpha2[1];
1918 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1919 request->country_ie_env = env;
1921 queue_regulatory_request(request);
1928 static void restore_alpha2(char *alpha2, bool reset_user)
1930 /* indicates there is no alpha2 to consider for restoration */
1934 /* The user setting has precedence over the module parameter */
1935 if (is_user_regdom_saved()) {
1936 /* Unless we're asked to ignore it and reset it */
1938 REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
1939 user_alpha2[0] = '9';
1940 user_alpha2[1] = '7';
1943 * If we're ignoring user settings, we still need to
1944 * check the module parameter to ensure we put things
1945 * back as they were for a full restore.
1947 if (!is_world_regdom(ieee80211_regdom)) {
1948 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
1949 ieee80211_regdom[0], ieee80211_regdom[1]);
1950 alpha2[0] = ieee80211_regdom[0];
1951 alpha2[1] = ieee80211_regdom[1];
1954 REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
1955 user_alpha2[0], user_alpha2[1]);
1956 alpha2[0] = user_alpha2[0];
1957 alpha2[1] = user_alpha2[1];
1959 } else if (!is_world_regdom(ieee80211_regdom)) {
1960 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
1961 ieee80211_regdom[0], ieee80211_regdom[1]);
1962 alpha2[0] = ieee80211_regdom[0];
1963 alpha2[1] = ieee80211_regdom[1];
1965 REG_DBG_PRINT("Restoring regulatory settings\n");
1968 static void restore_custom_reg_settings(struct wiphy *wiphy)
1970 struct ieee80211_supported_band *sband;
1971 enum ieee80211_band band;
1972 struct ieee80211_channel *chan;
1975 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1976 sband = wiphy->bands[band];
1979 for (i = 0; i < sband->n_channels; i++) {
1980 chan = &sband->channels[i];
1981 chan->flags = chan->orig_flags;
1982 chan->max_antenna_gain = chan->orig_mag;
1983 chan->max_power = chan->orig_mpwr;
1984 chan->beacon_found = false;
1990 * Restoring regulatory settings involves ingoring any
1991 * possibly stale country IE information and user regulatory
1992 * settings if so desired, this includes any beacon hints
1993 * learned as we could have traveled outside to another country
1994 * after disconnection. To restore regulatory settings we do
1995 * exactly what we did at bootup:
1997 * - send a core regulatory hint
1998 * - send a user regulatory hint if applicable
2000 * Device drivers that send a regulatory hint for a specific country
2001 * keep their own regulatory domain on wiphy->regd so that does does
2002 * not need to be remembered.
2004 static void restore_regulatory_settings(bool reset_user)
2007 char world_alpha2[2];
2008 struct reg_beacon *reg_beacon, *btmp;
2009 struct regulatory_request *reg_request, *tmp;
2010 LIST_HEAD(tmp_reg_req_list);
2011 struct cfg80211_registered_device *rdev;
2015 reset_regdomains(true, &world_regdom);
2016 restore_alpha2(alpha2, reset_user);
2019 * If there's any pending requests we simply
2020 * stash them to a temporary pending queue and
2021 * add then after we've restored regulatory
2024 spin_lock(®_requests_lock);
2025 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
2026 if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER)
2028 list_move_tail(®_request->list, &tmp_reg_req_list);
2030 spin_unlock(®_requests_lock);
2032 /* Clear beacon hints */
2033 spin_lock_bh(®_pending_beacons_lock);
2034 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2035 list_del(®_beacon->list);
2038 spin_unlock_bh(®_pending_beacons_lock);
2040 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2041 list_del(®_beacon->list);
2045 /* First restore to the basic regulatory settings */
2046 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
2047 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
2049 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2050 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
2051 restore_custom_reg_settings(&rdev->wiphy);
2054 regulatory_hint_core(world_alpha2);
2057 * This restores the ieee80211_regdom module parameter
2058 * preference or the last user requested regulatory
2059 * settings, user regulatory settings takes precedence.
2061 if (is_an_alpha2(alpha2))
2062 regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
2064 spin_lock(®_requests_lock);
2065 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
2066 spin_unlock(®_requests_lock);
2068 REG_DBG_PRINT("Kicking the queue\n");
2070 schedule_work(®_work);
2073 void regulatory_hint_disconnect(void)
2075 REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
2076 restore_regulatory_settings(false);
2079 static bool freq_is_chan_12_13_14(u16 freq)
2081 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
2082 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
2083 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
2088 static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
2090 struct reg_beacon *pending_beacon;
2092 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
2093 if (beacon_chan->center_freq ==
2094 pending_beacon->chan.center_freq)
2099 int regulatory_hint_found_beacon(struct wiphy *wiphy,
2100 struct ieee80211_channel *beacon_chan,
2103 struct reg_beacon *reg_beacon;
2106 if (beacon_chan->beacon_found ||
2107 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
2108 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
2109 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
2112 spin_lock_bh(®_pending_beacons_lock);
2113 processing = pending_reg_beacon(beacon_chan);
2114 spin_unlock_bh(®_pending_beacons_lock);
2119 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
2123 REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
2124 beacon_chan->center_freq,
2125 ieee80211_frequency_to_channel(beacon_chan->center_freq),
2128 memcpy(®_beacon->chan, beacon_chan,
2129 sizeof(struct ieee80211_channel));
2132 * Since we can be called from BH or and non-BH context
2133 * we must use spin_lock_bh()
2135 spin_lock_bh(®_pending_beacons_lock);
2136 list_add_tail(®_beacon->list, ®_pending_beacons);
2137 spin_unlock_bh(®_pending_beacons_lock);
2139 schedule_work(®_work);
2144 static void print_rd_rules(const struct ieee80211_regdomain *rd)
2147 const struct ieee80211_reg_rule *reg_rule = NULL;
2148 const struct ieee80211_freq_range *freq_range = NULL;
2149 const struct ieee80211_power_rule *power_rule = NULL;
2151 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
2153 for (i = 0; i < rd->n_reg_rules; i++) {
2154 reg_rule = &rd->reg_rules[i];
2155 freq_range = ®_rule->freq_range;
2156 power_rule = ®_rule->power_rule;
2159 * There may not be documentation for max antenna gain
2160 * in certain regions
2162 if (power_rule->max_antenna_gain)
2163 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
2164 freq_range->start_freq_khz,
2165 freq_range->end_freq_khz,
2166 freq_range->max_bandwidth_khz,
2167 power_rule->max_antenna_gain,
2168 power_rule->max_eirp);
2170 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
2171 freq_range->start_freq_khz,
2172 freq_range->end_freq_khz,
2173 freq_range->max_bandwidth_khz,
2174 power_rule->max_eirp);
2178 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
2180 switch (dfs_region) {
2181 case NL80211_DFS_UNSET:
2182 case NL80211_DFS_FCC:
2183 case NL80211_DFS_ETSI:
2184 case NL80211_DFS_JP:
2187 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2193 static void print_regdomain(const struct ieee80211_regdomain *rd)
2195 struct regulatory_request *lr = get_last_request();
2197 if (is_intersected_alpha2(rd->alpha2)) {
2198 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2199 struct cfg80211_registered_device *rdev;
2200 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
2202 pr_info("Current regulatory domain updated by AP to: %c%c\n",
2203 rdev->country_ie_alpha2[0],
2204 rdev->country_ie_alpha2[1]);
2206 pr_info("Current regulatory domain intersected:\n");
2208 pr_info("Current regulatory domain intersected:\n");
2209 } else if (is_world_regdom(rd->alpha2)) {
2210 pr_info("World regulatory domain updated:\n");
2212 if (is_unknown_alpha2(rd->alpha2))
2213 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
2215 if (reg_request_cell_base(lr))
2216 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
2217 rd->alpha2[0], rd->alpha2[1]);
2219 pr_info("Regulatory domain changed to country: %c%c\n",
2220 rd->alpha2[0], rd->alpha2[1]);
2224 pr_info(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
2228 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2230 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
2234 static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
2236 if (!is_world_regdom(rd->alpha2))
2238 update_world_regdomain(rd);
2242 static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
2243 struct regulatory_request *user_request)
2245 const struct ieee80211_regdomain *intersected_rd = NULL;
2247 if (is_world_regdom(rd->alpha2))
2250 if (!regdom_changes(rd->alpha2))
2253 if (!is_valid_rd(rd)) {
2254 pr_err("Invalid regulatory domain detected:\n");
2255 print_regdomain_info(rd);
2259 if (!user_request->intersect) {
2260 reset_regdomains(false, rd);
2264 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2265 if (!intersected_rd)
2270 reset_regdomains(false, intersected_rd);
2275 static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
2276 struct regulatory_request *driver_request)
2278 const struct ieee80211_regdomain *regd;
2279 const struct ieee80211_regdomain *intersected_rd = NULL;
2280 const struct ieee80211_regdomain *tmp;
2281 struct wiphy *request_wiphy;
2283 if (is_world_regdom(rd->alpha2))
2286 if (!regdom_changes(rd->alpha2))
2289 if (!is_valid_rd(rd)) {
2290 pr_err("Invalid regulatory domain detected:\n");
2291 print_regdomain_info(rd);
2295 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
2296 if (!request_wiphy) {
2297 schedule_delayed_work(®_timeout, 0);
2301 if (!driver_request->intersect) {
2302 if (request_wiphy->regd)
2305 regd = reg_copy_regd(rd);
2307 return PTR_ERR(regd);
2309 rcu_assign_pointer(request_wiphy->regd, regd);
2310 reset_regdomains(false, rd);
2314 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2315 if (!intersected_rd)
2319 * We can trash what CRDA provided now.
2320 * However if a driver requested this specific regulatory
2321 * domain we keep it for its private use
2323 tmp = get_wiphy_regdom(request_wiphy);
2324 rcu_assign_pointer(request_wiphy->regd, rd);
2325 rcu_free_regdom(tmp);
2329 reset_regdomains(false, intersected_rd);
2334 static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
2335 struct regulatory_request *country_ie_request)
2337 struct wiphy *request_wiphy;
2339 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2340 !is_unknown_alpha2(rd->alpha2))
2344 * Lets only bother proceeding on the same alpha2 if the current
2345 * rd is non static (it means CRDA was present and was used last)
2346 * and the pending request came in from a country IE
2349 if (!is_valid_rd(rd)) {
2350 pr_err("Invalid regulatory domain detected:\n");
2351 print_regdomain_info(rd);
2355 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
2356 if (!request_wiphy) {
2357 schedule_delayed_work(®_timeout, 0);
2361 if (country_ie_request->intersect)
2364 reset_regdomains(false, rd);
2369 * Use this call to set the current regulatory domain. Conflicts with
2370 * multiple drivers can be ironed out later. Caller must've already
2371 * kmalloc'd the rd structure.
2373 int set_regdom(const struct ieee80211_regdomain *rd)
2375 struct regulatory_request *lr;
2378 if (!reg_is_valid_request(rd->alpha2)) {
2383 lr = get_last_request();
2385 /* Note that this doesn't update the wiphys, this is done below */
2386 switch (lr->initiator) {
2387 case NL80211_REGDOM_SET_BY_CORE:
2388 r = reg_set_rd_core(rd);
2390 case NL80211_REGDOM_SET_BY_USER:
2391 r = reg_set_rd_user(rd, lr);
2393 case NL80211_REGDOM_SET_BY_DRIVER:
2394 r = reg_set_rd_driver(rd, lr);
2396 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2397 r = reg_set_rd_country_ie(rd, lr);
2400 WARN(1, "invalid initiator %d\n", lr->initiator);
2406 reg_set_request_processed();
2412 /* This would make this whole thing pointless */
2413 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
2416 /* update all wiphys now with the new established regulatory domain */
2417 update_all_wiphy_regulatory(lr->initiator);
2419 print_regdomain(get_cfg80211_regdom());
2421 nl80211_send_reg_change_event(lr);
2423 reg_set_request_processed();
2428 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2430 struct regulatory_request *lr;
2435 lr = get_last_request();
2436 if (lr && !lr->processed) {
2437 memcpy(alpha2, lr->alpha2, 2);
2443 return add_uevent_var(env, "COUNTRY=%c%c",
2444 alpha2[0], alpha2[1]);
2448 void wiphy_regulatory_register(struct wiphy *wiphy)
2450 struct regulatory_request *lr;
2452 if (!reg_dev_ignore_cell_hint(wiphy))
2453 reg_num_devs_support_basehint++;
2455 lr = get_last_request();
2456 wiphy_update_regulatory(wiphy, lr->initiator);
2459 void wiphy_regulatory_deregister(struct wiphy *wiphy)
2461 struct wiphy *request_wiphy = NULL;
2462 struct regulatory_request *lr;
2464 lr = get_last_request();
2466 if (!reg_dev_ignore_cell_hint(wiphy))
2467 reg_num_devs_support_basehint--;
2469 rcu_free_regdom(get_wiphy_regdom(wiphy));
2470 rcu_assign_pointer(wiphy->regd, NULL);
2473 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2475 if (!request_wiphy || request_wiphy != wiphy)
2478 lr->wiphy_idx = WIPHY_IDX_INVALID;
2479 lr->country_ie_env = ENVIRON_ANY;
2482 static void reg_timeout_work(struct work_struct *work)
2484 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
2486 restore_regulatory_settings(true);
2490 int __init regulatory_init(void)
2494 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2495 if (IS_ERR(reg_pdev))
2496 return PTR_ERR(reg_pdev);
2498 reg_pdev->dev.type = ®_device_type;
2500 spin_lock_init(®_requests_lock);
2501 spin_lock_init(®_pending_beacons_lock);
2503 reg_regdb_size_check();
2505 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
2507 user_alpha2[0] = '9';
2508 user_alpha2[1] = '7';
2510 /* We always try to get an update for the static regdomain */
2511 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
2516 * N.B. kobject_uevent_env() can fail mainly for when we're out
2517 * memory which is handled and propagated appropriately above
2518 * but it can also fail during a netlink_broadcast() or during
2519 * early boot for call_usermodehelper(). For now treat these
2520 * errors as non-fatal.
2522 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2526 * Finally, if the user set the module parameter treat it
2529 if (!is_world_regdom(ieee80211_regdom))
2530 regulatory_hint_user(ieee80211_regdom,
2531 NL80211_USER_REG_HINT_USER);
2536 void regulatory_exit(void)
2538 struct regulatory_request *reg_request, *tmp;
2539 struct reg_beacon *reg_beacon, *btmp;
2541 cancel_work_sync(®_work);
2542 cancel_delayed_work_sync(®_timeout);
2544 /* Lock to suppress warnings */
2546 reset_regdomains(true, NULL);
2549 dev_set_uevent_suppress(®_pdev->dev, true);
2551 platform_device_unregister(reg_pdev);
2553 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2554 list_del(®_beacon->list);
2558 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2559 list_del(®_beacon->list);
2563 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
2564 list_del(®_request->list);