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 const 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 static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
527 struct regulatory_request *lr = get_last_request();
530 * Follow the driver's regulatory domain, if present, unless a country
531 * IE has been processed or a user wants to help complaince further
533 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
534 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
536 return get_wiphy_regdom(wiphy);
538 return get_cfg80211_regdom();
541 /* Sanity check on a regulatory rule */
542 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
544 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
547 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
550 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
553 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
555 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
556 freq_range->max_bandwidth_khz > freq_diff)
562 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
564 const struct ieee80211_reg_rule *reg_rule = NULL;
567 if (!rd->n_reg_rules)
570 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
573 for (i = 0; i < rd->n_reg_rules; i++) {
574 reg_rule = &rd->reg_rules[i];
575 if (!is_valid_reg_rule(reg_rule))
582 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
583 u32 center_freq_khz, u32 bw_khz)
585 u32 start_freq_khz, end_freq_khz;
587 start_freq_khz = center_freq_khz - (bw_khz/2);
588 end_freq_khz = center_freq_khz + (bw_khz/2);
590 if (start_freq_khz >= freq_range->start_freq_khz &&
591 end_freq_khz <= freq_range->end_freq_khz)
598 * freq_in_rule_band - tells us if a frequency is in a frequency band
599 * @freq_range: frequency rule we want to query
600 * @freq_khz: frequency we are inquiring about
602 * This lets us know if a specific frequency rule is or is not relevant to
603 * a specific frequency's band. Bands are device specific and artificial
604 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
605 * however it is safe for now to assume that a frequency rule should not be
606 * part of a frequency's band if the start freq or end freq are off by more
607 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
609 * This resolution can be lowered and should be considered as we add
610 * regulatory rule support for other "bands".
612 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
615 #define ONE_GHZ_IN_KHZ 1000000
617 * From 802.11ad: directional multi-gigabit (DMG):
618 * Pertaining to operation in a frequency band containing a channel
619 * with the Channel starting frequency above 45 GHz.
621 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
622 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
623 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
625 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
628 #undef ONE_GHZ_IN_KHZ
632 * Later on we can perhaps use the more restrictive DFS
633 * region but we don't have information for that yet so
634 * for now simply disallow conflicts.
636 static enum nl80211_dfs_regions
637 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
638 const enum nl80211_dfs_regions dfs_region2)
640 if (dfs_region1 != dfs_region2)
641 return NL80211_DFS_UNSET;
646 * Helper for regdom_intersect(), this does the real
647 * mathematical intersection fun
649 static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,
650 const struct ieee80211_reg_rule *rule2,
651 struct ieee80211_reg_rule *intersected_rule)
653 const struct ieee80211_freq_range *freq_range1, *freq_range2;
654 struct ieee80211_freq_range *freq_range;
655 const struct ieee80211_power_rule *power_rule1, *power_rule2;
656 struct ieee80211_power_rule *power_rule;
659 freq_range1 = &rule1->freq_range;
660 freq_range2 = &rule2->freq_range;
661 freq_range = &intersected_rule->freq_range;
663 power_rule1 = &rule1->power_rule;
664 power_rule2 = &rule2->power_rule;
665 power_rule = &intersected_rule->power_rule;
667 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
668 freq_range2->start_freq_khz);
669 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
670 freq_range2->end_freq_khz);
671 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
672 freq_range2->max_bandwidth_khz);
674 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
675 if (freq_range->max_bandwidth_khz > freq_diff)
676 freq_range->max_bandwidth_khz = freq_diff;
678 power_rule->max_eirp = min(power_rule1->max_eirp,
679 power_rule2->max_eirp);
680 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
681 power_rule2->max_antenna_gain);
683 intersected_rule->flags = rule1->flags | rule2->flags;
685 if (!is_valid_reg_rule(intersected_rule))
692 * regdom_intersect - do the intersection between two regulatory domains
693 * @rd1: first regulatory domain
694 * @rd2: second regulatory domain
696 * Use this function to get the intersection between two regulatory domains.
697 * Once completed we will mark the alpha2 for the rd as intersected, "98",
698 * as no one single alpha2 can represent this regulatory domain.
700 * Returns a pointer to the regulatory domain structure which will hold the
701 * resulting intersection of rules between rd1 and rd2. We will
702 * kzalloc() this structure for you.
704 static struct ieee80211_regdomain *
705 regdom_intersect(const struct ieee80211_regdomain *rd1,
706 const struct ieee80211_regdomain *rd2)
710 unsigned int num_rules = 0, rule_idx = 0;
711 const struct ieee80211_reg_rule *rule1, *rule2;
712 struct ieee80211_reg_rule *intersected_rule;
713 struct ieee80211_regdomain *rd;
714 /* This is just a dummy holder to help us count */
715 struct ieee80211_reg_rule dummy_rule;
721 * First we get a count of the rules we'll need, then we actually
722 * build them. This is to so we can malloc() and free() a
723 * regdomain once. The reason we use reg_rules_intersect() here
724 * is it will return -EINVAL if the rule computed makes no sense.
725 * All rules that do check out OK are valid.
728 for (x = 0; x < rd1->n_reg_rules; x++) {
729 rule1 = &rd1->reg_rules[x];
730 for (y = 0; y < rd2->n_reg_rules; y++) {
731 rule2 = &rd2->reg_rules[y];
732 if (!reg_rules_intersect(rule1, rule2, &dummy_rule))
740 size_of_regd = sizeof(struct ieee80211_regdomain) +
741 num_rules * sizeof(struct ieee80211_reg_rule);
743 rd = kzalloc(size_of_regd, GFP_KERNEL);
747 for (x = 0; x < rd1->n_reg_rules && rule_idx < num_rules; x++) {
748 rule1 = &rd1->reg_rules[x];
749 for (y = 0; y < rd2->n_reg_rules && rule_idx < num_rules; y++) {
750 rule2 = &rd2->reg_rules[y];
752 * This time around instead of using the stack lets
753 * write to the target rule directly saving ourselves
756 intersected_rule = &rd->reg_rules[rule_idx];
757 r = reg_rules_intersect(rule1, rule2, intersected_rule);
759 * No need to memset here the intersected rule here as
760 * we're not using the stack anymore
768 if (rule_idx != num_rules) {
773 rd->n_reg_rules = num_rules;
776 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
783 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
784 * want to just have the channel structure use these
786 static u32 map_regdom_flags(u32 rd_flags)
788 u32 channel_flags = 0;
789 if (rd_flags & NL80211_RRF_NO_IR_ALL)
790 channel_flags |= IEEE80211_CHAN_NO_IR;
791 if (rd_flags & NL80211_RRF_DFS)
792 channel_flags |= IEEE80211_CHAN_RADAR;
793 if (rd_flags & NL80211_RRF_NO_OFDM)
794 channel_flags |= IEEE80211_CHAN_NO_OFDM;
795 return channel_flags;
798 static const struct ieee80211_reg_rule *
799 freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq,
800 const struct ieee80211_regdomain *regd)
803 bool band_rule_found = false;
804 bool bw_fits = false;
807 return ERR_PTR(-EINVAL);
809 for (i = 0; i < regd->n_reg_rules; i++) {
810 const struct ieee80211_reg_rule *rr;
811 const struct ieee80211_freq_range *fr = NULL;
813 rr = ®d->reg_rules[i];
814 fr = &rr->freq_range;
817 * We only need to know if one frequency rule was
818 * was in center_freq's band, that's enough, so lets
819 * not overwrite it once found
821 if (!band_rule_found)
822 band_rule_found = freq_in_rule_band(fr, center_freq);
824 bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20));
826 if (band_rule_found && bw_fits)
830 if (!band_rule_found)
831 return ERR_PTR(-ERANGE);
833 return ERR_PTR(-EINVAL);
836 const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
839 const struct ieee80211_regdomain *regd;
841 regd = reg_get_regdomain(wiphy);
843 return freq_reg_info_regd(wiphy, center_freq, regd);
845 EXPORT_SYMBOL(freq_reg_info);
847 const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
850 case NL80211_REGDOM_SET_BY_CORE:
852 case NL80211_REGDOM_SET_BY_USER:
854 case NL80211_REGDOM_SET_BY_DRIVER:
856 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
863 EXPORT_SYMBOL(reg_initiator_name);
865 #ifdef CONFIG_CFG80211_REG_DEBUG
866 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
867 const struct ieee80211_reg_rule *reg_rule)
869 const struct ieee80211_power_rule *power_rule;
870 const struct ieee80211_freq_range *freq_range;
871 char max_antenna_gain[32];
873 power_rule = ®_rule->power_rule;
874 freq_range = ®_rule->freq_range;
876 if (!power_rule->max_antenna_gain)
877 snprintf(max_antenna_gain, 32, "N/A");
879 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
881 REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
884 REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
885 freq_range->start_freq_khz, freq_range->end_freq_khz,
886 freq_range->max_bandwidth_khz, max_antenna_gain,
887 power_rule->max_eirp);
890 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
891 const struct ieee80211_reg_rule *reg_rule)
898 * Note that right now we assume the desired channel bandwidth
899 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
900 * per channel, the primary and the extension channel).
902 static void handle_channel(struct wiphy *wiphy,
903 enum nl80211_reg_initiator initiator,
904 struct ieee80211_channel *chan)
906 u32 flags, bw_flags = 0;
907 const struct ieee80211_reg_rule *reg_rule = NULL;
908 const struct ieee80211_power_rule *power_rule = NULL;
909 const struct ieee80211_freq_range *freq_range = NULL;
910 struct wiphy *request_wiphy = NULL;
911 struct regulatory_request *lr = get_last_request();
913 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
915 flags = chan->orig_flags;
917 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
918 if (IS_ERR(reg_rule)) {
920 * We will disable all channels that do not match our
921 * received regulatory rule unless the hint is coming
922 * from a Country IE and the Country IE had no information
923 * about a band. The IEEE 802.11 spec allows for an AP
924 * to send only a subset of the regulatory rules allowed,
925 * so an AP in the US that only supports 2.4 GHz may only send
926 * a country IE with information for the 2.4 GHz band
927 * while 5 GHz is still supported.
929 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
930 PTR_ERR(reg_rule) == -ERANGE)
933 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
934 request_wiphy && request_wiphy == wiphy &&
935 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
936 REG_DBG_PRINT("Disabling freq %d MHz for good\n",
938 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
939 chan->flags = chan->orig_flags;
941 REG_DBG_PRINT("Disabling freq %d MHz\n",
943 chan->flags |= IEEE80211_CHAN_DISABLED;
948 chan_reg_rule_print_dbg(chan, reg_rule);
950 power_rule = ®_rule->power_rule;
951 freq_range = ®_rule->freq_range;
953 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
954 bw_flags = IEEE80211_CHAN_NO_HT40;
955 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))
956 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
957 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))
958 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
960 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
961 request_wiphy && request_wiphy == wiphy &&
962 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
964 * This guarantees the driver's requested regulatory domain
965 * will always be used as a base for further regulatory
968 chan->flags = chan->orig_flags =
969 map_regdom_flags(reg_rule->flags) | bw_flags;
970 chan->max_antenna_gain = chan->orig_mag =
971 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
972 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
973 (int) MBM_TO_DBM(power_rule->max_eirp);
977 chan->dfs_state = NL80211_DFS_USABLE;
978 chan->dfs_state_entered = jiffies;
980 chan->beacon_found = false;
981 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
982 chan->max_antenna_gain =
983 min_t(int, chan->orig_mag,
984 MBI_TO_DBI(power_rule->max_antenna_gain));
985 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
986 if (chan->orig_mpwr) {
988 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
989 * will always follow the passed country IE power settings.
991 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
992 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
993 chan->max_power = chan->max_reg_power;
995 chan->max_power = min(chan->orig_mpwr,
996 chan->max_reg_power);
998 chan->max_power = chan->max_reg_power;
1001 static void handle_band(struct wiphy *wiphy,
1002 enum nl80211_reg_initiator initiator,
1003 struct ieee80211_supported_band *sband)
1010 for (i = 0; i < sband->n_channels; i++)
1011 handle_channel(wiphy, initiator, &sband->channels[i]);
1014 static bool reg_request_cell_base(struct regulatory_request *request)
1016 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1018 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1021 bool reg_last_request_cell_base(void)
1023 return reg_request_cell_base(get_last_request());
1026 #ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
1027 /* Core specific check */
1028 static enum reg_request_treatment
1029 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1031 struct regulatory_request *lr = get_last_request();
1033 if (!reg_num_devs_support_basehint)
1034 return REG_REQ_IGNORE;
1036 if (reg_request_cell_base(lr) &&
1037 !regdom_changes(pending_request->alpha2))
1038 return REG_REQ_ALREADY_SET;
1043 /* Device specific check */
1044 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1046 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1049 static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
1051 return REG_REQ_IGNORE;
1054 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1060 static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1062 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1063 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1068 static bool ignore_reg_update(struct wiphy *wiphy,
1069 enum nl80211_reg_initiator initiator)
1071 struct regulatory_request *lr = get_last_request();
1074 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1075 "since last_request is not set\n",
1076 reg_initiator_name(initiator));
1080 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1081 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1082 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1083 "since the driver uses its own custom "
1084 "regulatory domain\n",
1085 reg_initiator_name(initiator));
1090 * wiphy->regd will be set once the device has its own
1091 * desired regulatory domain set
1093 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1094 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1095 !is_world_regdom(lr->alpha2)) {
1096 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1097 "since the driver requires its own regulatory "
1098 "domain to be set first\n",
1099 reg_initiator_name(initiator));
1103 if (reg_request_cell_base(lr))
1104 return reg_dev_ignore_cell_hint(wiphy);
1109 static bool reg_is_world_roaming(struct wiphy *wiphy)
1111 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1112 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1113 struct regulatory_request *lr = get_last_request();
1115 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1118 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1119 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1125 static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1126 struct reg_beacon *reg_beacon)
1128 struct ieee80211_supported_band *sband;
1129 struct ieee80211_channel *chan;
1130 bool channel_changed = false;
1131 struct ieee80211_channel chan_before;
1133 sband = wiphy->bands[reg_beacon->chan.band];
1134 chan = &sband->channels[chan_idx];
1136 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1139 if (chan->beacon_found)
1142 chan->beacon_found = true;
1144 if (!reg_is_world_roaming(wiphy))
1147 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1150 chan_before.center_freq = chan->center_freq;
1151 chan_before.flags = chan->flags;
1153 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1154 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1155 channel_changed = true;
1158 if (channel_changed)
1159 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1163 * Called when a scan on a wiphy finds a beacon on
1166 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1167 struct reg_beacon *reg_beacon)
1170 struct ieee80211_supported_band *sband;
1172 if (!wiphy->bands[reg_beacon->chan.band])
1175 sband = wiphy->bands[reg_beacon->chan.band];
1177 for (i = 0; i < sband->n_channels; i++)
1178 handle_reg_beacon(wiphy, i, reg_beacon);
1182 * Called upon reg changes or a new wiphy is added
1184 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1187 struct ieee80211_supported_band *sband;
1188 struct reg_beacon *reg_beacon;
1190 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1191 if (!wiphy->bands[reg_beacon->chan.band])
1193 sband = wiphy->bands[reg_beacon->chan.band];
1194 for (i = 0; i < sband->n_channels; i++)
1195 handle_reg_beacon(wiphy, i, reg_beacon);
1199 /* Reap the advantages of previously found beacons */
1200 static void reg_process_beacons(struct wiphy *wiphy)
1203 * Means we are just firing up cfg80211, so no beacons would
1204 * have been processed yet.
1208 wiphy_update_beacon_reg(wiphy);
1211 static bool is_ht40_allowed(struct ieee80211_channel *chan)
1215 if (chan->flags & IEEE80211_CHAN_DISABLED)
1217 /* This would happen when regulatory rules disallow HT40 completely */
1218 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
1223 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1224 struct ieee80211_channel *channel)
1226 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
1227 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1230 if (!is_ht40_allowed(channel)) {
1231 channel->flags |= IEEE80211_CHAN_NO_HT40;
1236 * We need to ensure the extension channels exist to
1237 * be able to use HT40- or HT40+, this finds them (or not)
1239 for (i = 0; i < sband->n_channels; i++) {
1240 struct ieee80211_channel *c = &sband->channels[i];
1242 if (c->center_freq == (channel->center_freq - 20))
1244 if (c->center_freq == (channel->center_freq + 20))
1249 * Please note that this assumes target bandwidth is 20 MHz,
1250 * if that ever changes we also need to change the below logic
1251 * to include that as well.
1253 if (!is_ht40_allowed(channel_before))
1254 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1256 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1258 if (!is_ht40_allowed(channel_after))
1259 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1261 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1264 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1265 struct ieee80211_supported_band *sband)
1272 for (i = 0; i < sband->n_channels; i++)
1273 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
1276 static void reg_process_ht_flags(struct wiphy *wiphy)
1278 enum ieee80211_band band;
1283 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1284 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
1287 static void reg_call_notifier(struct wiphy *wiphy,
1288 struct regulatory_request *request)
1290 if (wiphy->reg_notifier)
1291 wiphy->reg_notifier(wiphy, request);
1294 static void wiphy_update_regulatory(struct wiphy *wiphy,
1295 enum nl80211_reg_initiator initiator)
1297 enum ieee80211_band band;
1298 struct regulatory_request *lr = get_last_request();
1300 if (ignore_reg_update(wiphy, initiator)) {
1302 * Regulatory updates set by CORE are ignored for custom
1303 * regulatory cards. Let us notify the changes to the driver,
1304 * as some drivers used this to restore its orig_* reg domain.
1306 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1307 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1308 reg_call_notifier(wiphy, lr);
1312 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
1314 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1315 handle_band(wiphy, initiator, wiphy->bands[band]);
1317 reg_process_beacons(wiphy);
1318 reg_process_ht_flags(wiphy);
1319 reg_call_notifier(wiphy, lr);
1322 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1324 struct cfg80211_registered_device *rdev;
1325 struct wiphy *wiphy;
1329 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1330 wiphy = &rdev->wiphy;
1331 wiphy_update_regulatory(wiphy, initiator);
1335 static void handle_channel_custom(struct wiphy *wiphy,
1336 struct ieee80211_channel *chan,
1337 const struct ieee80211_regdomain *regd)
1340 const struct ieee80211_reg_rule *reg_rule = NULL;
1341 const struct ieee80211_power_rule *power_rule = NULL;
1342 const struct ieee80211_freq_range *freq_range = NULL;
1344 reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1347 if (IS_ERR(reg_rule)) {
1348 REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1350 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1351 chan->flags = chan->orig_flags;
1355 chan_reg_rule_print_dbg(chan, reg_rule);
1357 power_rule = ®_rule->power_rule;
1358 freq_range = ®_rule->freq_range;
1360 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1361 bw_flags = IEEE80211_CHAN_NO_HT40;
1362 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))
1363 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1364 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))
1365 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1367 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1368 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1369 chan->max_reg_power = chan->max_power =
1370 (int) MBM_TO_DBM(power_rule->max_eirp);
1373 static void handle_band_custom(struct wiphy *wiphy,
1374 struct ieee80211_supported_band *sband,
1375 const struct ieee80211_regdomain *regd)
1382 for (i = 0; i < sband->n_channels; i++)
1383 handle_channel_custom(wiphy, &sband->channels[i], regd);
1386 /* Used by drivers prior to wiphy registration */
1387 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1388 const struct ieee80211_regdomain *regd)
1390 enum ieee80211_band band;
1391 unsigned int bands_set = 0;
1393 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
1394 "wiphy should have REGULATORY_CUSTOM_REG\n");
1395 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
1397 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1398 if (!wiphy->bands[band])
1400 handle_band_custom(wiphy, wiphy->bands[band], regd);
1405 * no point in calling this if it won't have any effect
1406 * on your device's supported bands.
1408 WARN_ON(!bands_set);
1410 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1412 static void reg_set_request_processed(void)
1414 bool need_more_processing = false;
1415 struct regulatory_request *lr = get_last_request();
1417 lr->processed = true;
1419 spin_lock(®_requests_lock);
1420 if (!list_empty(®_requests_list))
1421 need_more_processing = true;
1422 spin_unlock(®_requests_lock);
1424 if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
1425 cancel_delayed_work(®_timeout);
1427 if (need_more_processing)
1428 schedule_work(®_work);
1432 * reg_process_hint_core - process core regulatory requests
1433 * @pending_request: a pending core regulatory request
1435 * The wireless subsystem can use this function to process
1436 * a regulatory request issued by the regulatory core.
1438 * Returns one of the different reg request treatment values.
1440 static enum reg_request_treatment
1441 reg_process_hint_core(struct regulatory_request *core_request)
1444 core_request->intersect = false;
1445 core_request->processed = false;
1447 reg_update_last_request(core_request);
1449 return reg_call_crda(core_request);
1452 static enum reg_request_treatment
1453 __reg_process_hint_user(struct regulatory_request *user_request)
1455 struct regulatory_request *lr = get_last_request();
1457 if (reg_request_cell_base(user_request))
1458 return reg_ignore_cell_hint(user_request);
1460 if (reg_request_cell_base(lr))
1461 return REG_REQ_IGNORE;
1463 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1464 return REG_REQ_INTERSECT;
1466 * If the user knows better the user should set the regdom
1467 * to their country before the IE is picked up
1469 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
1471 return REG_REQ_IGNORE;
1473 * Process user requests only after previous user/driver/core
1474 * requests have been processed
1476 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
1477 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1478 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
1479 regdom_changes(lr->alpha2))
1480 return REG_REQ_IGNORE;
1482 if (!regdom_changes(user_request->alpha2))
1483 return REG_REQ_ALREADY_SET;
1489 * reg_process_hint_user - process user regulatory requests
1490 * @user_request: a pending user regulatory request
1492 * The wireless subsystem can use this function to process
1493 * a regulatory request initiated by userspace.
1495 * Returns one of the different reg request treatment values.
1497 static enum reg_request_treatment
1498 reg_process_hint_user(struct regulatory_request *user_request)
1500 enum reg_request_treatment treatment;
1502 treatment = __reg_process_hint_user(user_request);
1503 if (treatment == REG_REQ_IGNORE ||
1504 treatment == REG_REQ_ALREADY_SET) {
1505 kfree(user_request);
1509 user_request->intersect = treatment == REG_REQ_INTERSECT;
1510 user_request->processed = false;
1512 reg_update_last_request(user_request);
1514 user_alpha2[0] = user_request->alpha2[0];
1515 user_alpha2[1] = user_request->alpha2[1];
1517 return reg_call_crda(user_request);
1520 static enum reg_request_treatment
1521 __reg_process_hint_driver(struct regulatory_request *driver_request)
1523 struct regulatory_request *lr = get_last_request();
1525 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
1526 if (regdom_changes(driver_request->alpha2))
1528 return REG_REQ_ALREADY_SET;
1532 * This would happen if you unplug and plug your card
1533 * back in or if you add a new device for which the previously
1534 * loaded card also agrees on the regulatory domain.
1536 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1537 !regdom_changes(driver_request->alpha2))
1538 return REG_REQ_ALREADY_SET;
1540 return REG_REQ_INTERSECT;
1544 * reg_process_hint_driver - process driver regulatory requests
1545 * @driver_request: a pending driver regulatory request
1547 * The wireless subsystem can use this function to process
1548 * a regulatory request issued by an 802.11 driver.
1550 * Returns one of the different reg request treatment values.
1552 static enum reg_request_treatment
1553 reg_process_hint_driver(struct wiphy *wiphy,
1554 struct regulatory_request *driver_request)
1556 const struct ieee80211_regdomain *regd;
1557 enum reg_request_treatment treatment;
1559 treatment = __reg_process_hint_driver(driver_request);
1561 switch (treatment) {
1564 case REG_REQ_IGNORE:
1565 kfree(driver_request);
1567 case REG_REQ_INTERSECT:
1569 case REG_REQ_ALREADY_SET:
1570 regd = reg_copy_regd(get_cfg80211_regdom());
1572 kfree(driver_request);
1573 return REG_REQ_IGNORE;
1575 rcu_assign_pointer(wiphy->regd, regd);
1579 driver_request->intersect = treatment == REG_REQ_INTERSECT;
1580 driver_request->processed = false;
1582 reg_update_last_request(driver_request);
1585 * Since CRDA will not be called in this case as we already
1586 * have applied the requested regulatory domain before we just
1587 * inform userspace we have processed the request
1589 if (treatment == REG_REQ_ALREADY_SET) {
1590 nl80211_send_reg_change_event(driver_request);
1591 reg_set_request_processed();
1595 return reg_call_crda(driver_request);
1598 static enum reg_request_treatment
1599 __reg_process_hint_country_ie(struct wiphy *wiphy,
1600 struct regulatory_request *country_ie_request)
1602 struct wiphy *last_wiphy = NULL;
1603 struct regulatory_request *lr = get_last_request();
1605 if (reg_request_cell_base(lr)) {
1606 /* Trust a Cell base station over the AP's country IE */
1607 if (regdom_changes(country_ie_request->alpha2))
1608 return REG_REQ_IGNORE;
1609 return REG_REQ_ALREADY_SET;
1611 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
1612 return REG_REQ_IGNORE;
1615 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
1618 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
1621 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1623 if (last_wiphy != wiphy) {
1625 * Two cards with two APs claiming different
1626 * Country IE alpha2s. We could
1627 * intersect them, but that seems unlikely
1628 * to be correct. Reject second one for now.
1630 if (regdom_changes(country_ie_request->alpha2))
1631 return REG_REQ_IGNORE;
1632 return REG_REQ_ALREADY_SET;
1635 * Two consecutive Country IE hints on the same wiphy.
1636 * This should be picked up early by the driver/stack
1638 if (WARN_ON(regdom_changes(country_ie_request->alpha2)))
1640 return REG_REQ_ALREADY_SET;
1644 * reg_process_hint_country_ie - process regulatory requests from country IEs
1645 * @country_ie_request: a regulatory request from a country IE
1647 * The wireless subsystem can use this function to process
1648 * a regulatory request issued by a country Information Element.
1650 * Returns one of the different reg request treatment values.
1652 static enum reg_request_treatment
1653 reg_process_hint_country_ie(struct wiphy *wiphy,
1654 struct regulatory_request *country_ie_request)
1656 enum reg_request_treatment treatment;
1658 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
1660 switch (treatment) {
1663 case REG_REQ_IGNORE:
1665 case REG_REQ_ALREADY_SET:
1666 kfree(country_ie_request);
1668 case REG_REQ_INTERSECT:
1669 kfree(country_ie_request);
1671 * This doesn't happen yet, not sure we
1672 * ever want to support it for this case.
1674 WARN_ONCE(1, "Unexpected intersection for country IEs");
1675 return REG_REQ_IGNORE;
1678 country_ie_request->intersect = false;
1679 country_ie_request->processed = false;
1681 reg_update_last_request(country_ie_request);
1683 return reg_call_crda(country_ie_request);
1686 /* This processes *all* regulatory hints */
1687 static void reg_process_hint(struct regulatory_request *reg_request)
1689 struct wiphy *wiphy = NULL;
1690 enum reg_request_treatment treatment;
1692 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
1693 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1695 switch (reg_request->initiator) {
1696 case NL80211_REGDOM_SET_BY_CORE:
1697 reg_process_hint_core(reg_request);
1699 case NL80211_REGDOM_SET_BY_USER:
1700 treatment = reg_process_hint_user(reg_request);
1701 if (treatment == REG_REQ_OK ||
1702 treatment == REG_REQ_ALREADY_SET)
1704 queue_delayed_work(system_power_efficient_wq,
1705 ®_timeout, msecs_to_jiffies(3142));
1707 case NL80211_REGDOM_SET_BY_DRIVER:
1710 treatment = reg_process_hint_driver(wiphy, reg_request);
1712 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1715 treatment = reg_process_hint_country_ie(wiphy, reg_request);
1718 WARN(1, "invalid initiator %d\n", reg_request->initiator);
1722 /* This is required so that the orig_* parameters are saved */
1723 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
1724 wiphy->regulatory_flags & REGULATORY_STRICT_REG)
1725 wiphy_update_regulatory(wiphy, reg_request->initiator);
1734 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1735 * Regulatory hints come on a first come first serve basis and we
1736 * must process each one atomically.
1738 static void reg_process_pending_hints(void)
1740 struct regulatory_request *reg_request, *lr;
1742 lr = get_last_request();
1744 /* When last_request->processed becomes true this will be rescheduled */
1745 if (lr && !lr->processed) {
1746 REG_DBG_PRINT("Pending regulatory request, waiting for it to be processed...\n");
1750 spin_lock(®_requests_lock);
1752 if (list_empty(®_requests_list)) {
1753 spin_unlock(®_requests_lock);
1757 reg_request = list_first_entry(®_requests_list,
1758 struct regulatory_request,
1760 list_del_init(®_request->list);
1762 spin_unlock(®_requests_lock);
1764 reg_process_hint(reg_request);
1767 /* Processes beacon hints -- this has nothing to do with country IEs */
1768 static void reg_process_pending_beacon_hints(void)
1770 struct cfg80211_registered_device *rdev;
1771 struct reg_beacon *pending_beacon, *tmp;
1773 /* This goes through the _pending_ beacon list */
1774 spin_lock_bh(®_pending_beacons_lock);
1776 list_for_each_entry_safe(pending_beacon, tmp,
1777 ®_pending_beacons, list) {
1778 list_del_init(&pending_beacon->list);
1780 /* Applies the beacon hint to current wiphys */
1781 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1782 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1784 /* Remembers the beacon hint for new wiphys or reg changes */
1785 list_add_tail(&pending_beacon->list, ®_beacon_list);
1788 spin_unlock_bh(®_pending_beacons_lock);
1791 static void reg_todo(struct work_struct *work)
1794 reg_process_pending_hints();
1795 reg_process_pending_beacon_hints();
1799 static void queue_regulatory_request(struct regulatory_request *request)
1801 request->alpha2[0] = toupper(request->alpha2[0]);
1802 request->alpha2[1] = toupper(request->alpha2[1]);
1804 spin_lock(®_requests_lock);
1805 list_add_tail(&request->list, ®_requests_list);
1806 spin_unlock(®_requests_lock);
1808 schedule_work(®_work);
1812 * Core regulatory hint -- happens during cfg80211_init()
1813 * and when we restore regulatory settings.
1815 static int regulatory_hint_core(const char *alpha2)
1817 struct regulatory_request *request;
1819 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1823 request->alpha2[0] = alpha2[0];
1824 request->alpha2[1] = alpha2[1];
1825 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1827 queue_regulatory_request(request);
1833 int regulatory_hint_user(const char *alpha2,
1834 enum nl80211_user_reg_hint_type user_reg_hint_type)
1836 struct regulatory_request *request;
1838 if (WARN_ON(!alpha2))
1841 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1845 request->wiphy_idx = WIPHY_IDX_INVALID;
1846 request->alpha2[0] = alpha2[0];
1847 request->alpha2[1] = alpha2[1];
1848 request->initiator = NL80211_REGDOM_SET_BY_USER;
1849 request->user_reg_hint_type = user_reg_hint_type;
1851 queue_regulatory_request(request);
1857 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1859 struct regulatory_request *request;
1861 if (WARN_ON(!alpha2 || !wiphy))
1864 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
1866 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1870 request->wiphy_idx = get_wiphy_idx(wiphy);
1872 request->alpha2[0] = alpha2[0];
1873 request->alpha2[1] = alpha2[1];
1874 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1876 queue_regulatory_request(request);
1880 EXPORT_SYMBOL(regulatory_hint);
1882 void regulatory_hint_country_ie(struct wiphy *wiphy, enum ieee80211_band band,
1883 const u8 *country_ie, u8 country_ie_len)
1886 enum environment_cap env = ENVIRON_ANY;
1887 struct regulatory_request *request = NULL, *lr;
1889 /* IE len must be evenly divisible by 2 */
1890 if (country_ie_len & 0x01)
1893 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1896 request = kzalloc(sizeof(*request), GFP_KERNEL);
1900 alpha2[0] = country_ie[0];
1901 alpha2[1] = country_ie[1];
1903 if (country_ie[2] == 'I')
1904 env = ENVIRON_INDOOR;
1905 else if (country_ie[2] == 'O')
1906 env = ENVIRON_OUTDOOR;
1909 lr = get_last_request();
1915 * We will run this only upon a successful connection on cfg80211.
1916 * We leave conflict resolution to the workqueue, where can hold
1919 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1920 lr->wiphy_idx != WIPHY_IDX_INVALID)
1923 request->wiphy_idx = get_wiphy_idx(wiphy);
1924 request->alpha2[0] = alpha2[0];
1925 request->alpha2[1] = alpha2[1];
1926 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1927 request->country_ie_env = env;
1929 queue_regulatory_request(request);
1936 static void restore_alpha2(char *alpha2, bool reset_user)
1938 /* indicates there is no alpha2 to consider for restoration */
1942 /* The user setting has precedence over the module parameter */
1943 if (is_user_regdom_saved()) {
1944 /* Unless we're asked to ignore it and reset it */
1946 REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
1947 user_alpha2[0] = '9';
1948 user_alpha2[1] = '7';
1951 * If we're ignoring user settings, we still need to
1952 * check the module parameter to ensure we put things
1953 * back as they were for a full restore.
1955 if (!is_world_regdom(ieee80211_regdom)) {
1956 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
1957 ieee80211_regdom[0], ieee80211_regdom[1]);
1958 alpha2[0] = ieee80211_regdom[0];
1959 alpha2[1] = ieee80211_regdom[1];
1962 REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
1963 user_alpha2[0], user_alpha2[1]);
1964 alpha2[0] = user_alpha2[0];
1965 alpha2[1] = user_alpha2[1];
1967 } else if (!is_world_regdom(ieee80211_regdom)) {
1968 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
1969 ieee80211_regdom[0], ieee80211_regdom[1]);
1970 alpha2[0] = ieee80211_regdom[0];
1971 alpha2[1] = ieee80211_regdom[1];
1973 REG_DBG_PRINT("Restoring regulatory settings\n");
1976 static void restore_custom_reg_settings(struct wiphy *wiphy)
1978 struct ieee80211_supported_band *sband;
1979 enum ieee80211_band band;
1980 struct ieee80211_channel *chan;
1983 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1984 sband = wiphy->bands[band];
1987 for (i = 0; i < sband->n_channels; i++) {
1988 chan = &sband->channels[i];
1989 chan->flags = chan->orig_flags;
1990 chan->max_antenna_gain = chan->orig_mag;
1991 chan->max_power = chan->orig_mpwr;
1992 chan->beacon_found = false;
1998 * Restoring regulatory settings involves ingoring any
1999 * possibly stale country IE information and user regulatory
2000 * settings if so desired, this includes any beacon hints
2001 * learned as we could have traveled outside to another country
2002 * after disconnection. To restore regulatory settings we do
2003 * exactly what we did at bootup:
2005 * - send a core regulatory hint
2006 * - send a user regulatory hint if applicable
2008 * Device drivers that send a regulatory hint for a specific country
2009 * keep their own regulatory domain on wiphy->regd so that does does
2010 * not need to be remembered.
2012 static void restore_regulatory_settings(bool reset_user)
2015 char world_alpha2[2];
2016 struct reg_beacon *reg_beacon, *btmp;
2017 struct regulatory_request *reg_request, *tmp;
2018 LIST_HEAD(tmp_reg_req_list);
2019 struct cfg80211_registered_device *rdev;
2023 reset_regdomains(true, &world_regdom);
2024 restore_alpha2(alpha2, reset_user);
2027 * If there's any pending requests we simply
2028 * stash them to a temporary pending queue and
2029 * add then after we've restored regulatory
2032 spin_lock(®_requests_lock);
2033 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
2034 if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER)
2036 list_move_tail(®_request->list, &tmp_reg_req_list);
2038 spin_unlock(®_requests_lock);
2040 /* Clear beacon hints */
2041 spin_lock_bh(®_pending_beacons_lock);
2042 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2043 list_del(®_beacon->list);
2046 spin_unlock_bh(®_pending_beacons_lock);
2048 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2049 list_del(®_beacon->list);
2053 /* First restore to the basic regulatory settings */
2054 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
2055 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
2057 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2058 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
2059 restore_custom_reg_settings(&rdev->wiphy);
2062 regulatory_hint_core(world_alpha2);
2065 * This restores the ieee80211_regdom module parameter
2066 * preference or the last user requested regulatory
2067 * settings, user regulatory settings takes precedence.
2069 if (is_an_alpha2(alpha2))
2070 regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
2072 spin_lock(®_requests_lock);
2073 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
2074 spin_unlock(®_requests_lock);
2076 REG_DBG_PRINT("Kicking the queue\n");
2078 schedule_work(®_work);
2081 void regulatory_hint_disconnect(void)
2083 REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
2084 restore_regulatory_settings(false);
2087 static bool freq_is_chan_12_13_14(u16 freq)
2089 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
2090 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
2091 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
2096 static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
2098 struct reg_beacon *pending_beacon;
2100 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
2101 if (beacon_chan->center_freq ==
2102 pending_beacon->chan.center_freq)
2107 int regulatory_hint_found_beacon(struct wiphy *wiphy,
2108 struct ieee80211_channel *beacon_chan,
2111 struct reg_beacon *reg_beacon;
2114 if (beacon_chan->beacon_found ||
2115 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
2116 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
2117 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
2120 spin_lock_bh(®_pending_beacons_lock);
2121 processing = pending_reg_beacon(beacon_chan);
2122 spin_unlock_bh(®_pending_beacons_lock);
2127 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
2131 REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
2132 beacon_chan->center_freq,
2133 ieee80211_frequency_to_channel(beacon_chan->center_freq),
2136 memcpy(®_beacon->chan, beacon_chan,
2137 sizeof(struct ieee80211_channel));
2140 * Since we can be called from BH or and non-BH context
2141 * we must use spin_lock_bh()
2143 spin_lock_bh(®_pending_beacons_lock);
2144 list_add_tail(®_beacon->list, ®_pending_beacons);
2145 spin_unlock_bh(®_pending_beacons_lock);
2147 schedule_work(®_work);
2152 static void print_rd_rules(const struct ieee80211_regdomain *rd)
2155 const struct ieee80211_reg_rule *reg_rule = NULL;
2156 const struct ieee80211_freq_range *freq_range = NULL;
2157 const struct ieee80211_power_rule *power_rule = NULL;
2159 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
2161 for (i = 0; i < rd->n_reg_rules; i++) {
2162 reg_rule = &rd->reg_rules[i];
2163 freq_range = ®_rule->freq_range;
2164 power_rule = ®_rule->power_rule;
2167 * There may not be documentation for max antenna gain
2168 * in certain regions
2170 if (power_rule->max_antenna_gain)
2171 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
2172 freq_range->start_freq_khz,
2173 freq_range->end_freq_khz,
2174 freq_range->max_bandwidth_khz,
2175 power_rule->max_antenna_gain,
2176 power_rule->max_eirp);
2178 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
2179 freq_range->start_freq_khz,
2180 freq_range->end_freq_khz,
2181 freq_range->max_bandwidth_khz,
2182 power_rule->max_eirp);
2186 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
2188 switch (dfs_region) {
2189 case NL80211_DFS_UNSET:
2190 case NL80211_DFS_FCC:
2191 case NL80211_DFS_ETSI:
2192 case NL80211_DFS_JP:
2195 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2201 static void print_regdomain(const struct ieee80211_regdomain *rd)
2203 struct regulatory_request *lr = get_last_request();
2205 if (is_intersected_alpha2(rd->alpha2)) {
2206 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2207 struct cfg80211_registered_device *rdev;
2208 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
2210 pr_info("Current regulatory domain updated by AP to: %c%c\n",
2211 rdev->country_ie_alpha2[0],
2212 rdev->country_ie_alpha2[1]);
2214 pr_info("Current regulatory domain intersected:\n");
2216 pr_info("Current regulatory domain intersected:\n");
2217 } else if (is_world_regdom(rd->alpha2)) {
2218 pr_info("World regulatory domain updated:\n");
2220 if (is_unknown_alpha2(rd->alpha2))
2221 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
2223 if (reg_request_cell_base(lr))
2224 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
2225 rd->alpha2[0], rd->alpha2[1]);
2227 pr_info("Regulatory domain changed to country: %c%c\n",
2228 rd->alpha2[0], rd->alpha2[1]);
2232 pr_info(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
2236 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2238 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
2242 static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
2244 if (!is_world_regdom(rd->alpha2))
2246 update_world_regdomain(rd);
2250 static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
2251 struct regulatory_request *user_request)
2253 const struct ieee80211_regdomain *intersected_rd = NULL;
2255 if (is_world_regdom(rd->alpha2))
2258 if (!regdom_changes(rd->alpha2))
2261 if (!is_valid_rd(rd)) {
2262 pr_err("Invalid regulatory domain detected:\n");
2263 print_regdomain_info(rd);
2267 if (!user_request->intersect) {
2268 reset_regdomains(false, rd);
2272 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2273 if (!intersected_rd)
2278 reset_regdomains(false, intersected_rd);
2283 static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
2284 struct regulatory_request *driver_request)
2286 const struct ieee80211_regdomain *regd;
2287 const struct ieee80211_regdomain *intersected_rd = NULL;
2288 const struct ieee80211_regdomain *tmp;
2289 struct wiphy *request_wiphy;
2291 if (is_world_regdom(rd->alpha2))
2294 if (!regdom_changes(rd->alpha2))
2297 if (!is_valid_rd(rd)) {
2298 pr_err("Invalid regulatory domain detected:\n");
2299 print_regdomain_info(rd);
2303 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
2304 if (!request_wiphy) {
2305 queue_delayed_work(system_power_efficient_wq,
2310 if (!driver_request->intersect) {
2311 if (request_wiphy->regd)
2314 regd = reg_copy_regd(rd);
2316 return PTR_ERR(regd);
2318 rcu_assign_pointer(request_wiphy->regd, regd);
2319 reset_regdomains(false, rd);
2323 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2324 if (!intersected_rd)
2328 * We can trash what CRDA provided now.
2329 * However if a driver requested this specific regulatory
2330 * domain we keep it for its private use
2332 tmp = get_wiphy_regdom(request_wiphy);
2333 rcu_assign_pointer(request_wiphy->regd, rd);
2334 rcu_free_regdom(tmp);
2338 reset_regdomains(false, intersected_rd);
2343 static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
2344 struct regulatory_request *country_ie_request)
2346 struct wiphy *request_wiphy;
2348 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2349 !is_unknown_alpha2(rd->alpha2))
2353 * Lets only bother proceeding on the same alpha2 if the current
2354 * rd is non static (it means CRDA was present and was used last)
2355 * and the pending request came in from a country IE
2358 if (!is_valid_rd(rd)) {
2359 pr_err("Invalid regulatory domain detected:\n");
2360 print_regdomain_info(rd);
2364 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
2365 if (!request_wiphy) {
2366 queue_delayed_work(system_power_efficient_wq,
2371 if (country_ie_request->intersect)
2374 reset_regdomains(false, rd);
2379 * Use this call to set the current regulatory domain. Conflicts with
2380 * multiple drivers can be ironed out later. Caller must've already
2381 * kmalloc'd the rd structure.
2383 int set_regdom(const struct ieee80211_regdomain *rd)
2385 struct regulatory_request *lr;
2388 if (!reg_is_valid_request(rd->alpha2)) {
2393 lr = get_last_request();
2395 /* Note that this doesn't update the wiphys, this is done below */
2396 switch (lr->initiator) {
2397 case NL80211_REGDOM_SET_BY_CORE:
2398 r = reg_set_rd_core(rd);
2400 case NL80211_REGDOM_SET_BY_USER:
2401 r = reg_set_rd_user(rd, lr);
2403 case NL80211_REGDOM_SET_BY_DRIVER:
2404 r = reg_set_rd_driver(rd, lr);
2406 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2407 r = reg_set_rd_country_ie(rd, lr);
2410 WARN(1, "invalid initiator %d\n", lr->initiator);
2416 reg_set_request_processed();
2422 /* This would make this whole thing pointless */
2423 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
2426 /* update all wiphys now with the new established regulatory domain */
2427 update_all_wiphy_regulatory(lr->initiator);
2429 print_regdomain(get_cfg80211_regdom());
2431 nl80211_send_reg_change_event(lr);
2433 reg_set_request_processed();
2438 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2440 struct regulatory_request *lr;
2445 lr = get_last_request();
2446 if (lr && !lr->processed) {
2447 memcpy(alpha2, lr->alpha2, 2);
2453 return add_uevent_var(env, "COUNTRY=%c%c",
2454 alpha2[0], alpha2[1]);
2458 void wiphy_regulatory_register(struct wiphy *wiphy)
2460 struct regulatory_request *lr;
2462 if (!reg_dev_ignore_cell_hint(wiphy))
2463 reg_num_devs_support_basehint++;
2465 lr = get_last_request();
2466 wiphy_update_regulatory(wiphy, lr->initiator);
2469 void wiphy_regulatory_deregister(struct wiphy *wiphy)
2471 struct wiphy *request_wiphy = NULL;
2472 struct regulatory_request *lr;
2474 lr = get_last_request();
2476 if (!reg_dev_ignore_cell_hint(wiphy))
2477 reg_num_devs_support_basehint--;
2479 rcu_free_regdom(get_wiphy_regdom(wiphy));
2480 rcu_assign_pointer(wiphy->regd, NULL);
2483 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2485 if (!request_wiphy || request_wiphy != wiphy)
2488 lr->wiphy_idx = WIPHY_IDX_INVALID;
2489 lr->country_ie_env = ENVIRON_ANY;
2492 static void reg_timeout_work(struct work_struct *work)
2494 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
2496 restore_regulatory_settings(true);
2500 int __init regulatory_init(void)
2504 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2505 if (IS_ERR(reg_pdev))
2506 return PTR_ERR(reg_pdev);
2508 reg_pdev->dev.type = ®_device_type;
2510 spin_lock_init(®_requests_lock);
2511 spin_lock_init(®_pending_beacons_lock);
2513 reg_regdb_size_check();
2515 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
2517 user_alpha2[0] = '9';
2518 user_alpha2[1] = '7';
2520 /* We always try to get an update for the static regdomain */
2521 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
2526 * N.B. kobject_uevent_env() can fail mainly for when we're out
2527 * memory which is handled and propagated appropriately above
2528 * but it can also fail during a netlink_broadcast() or during
2529 * early boot for call_usermodehelper(). For now treat these
2530 * errors as non-fatal.
2532 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2536 * Finally, if the user set the module parameter treat it
2539 if (!is_world_regdom(ieee80211_regdom))
2540 regulatory_hint_user(ieee80211_regdom,
2541 NL80211_USER_REG_HINT_USER);
2546 void regulatory_exit(void)
2548 struct regulatory_request *reg_request, *tmp;
2549 struct reg_beacon *reg_beacon, *btmp;
2551 cancel_work_sync(®_work);
2552 cancel_delayed_work_sync(®_timeout);
2554 /* Lock to suppress warnings */
2556 reset_regdomains(true, NULL);
2559 dev_set_uevent_suppress(®_pdev->dev, true);
2561 platform_device_unregister(reg_pdev);
2563 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2564 list_del(®_beacon->list);
2568 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2569 list_del(®_beacon->list);
2573 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
2574 list_del(®_request->list);