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 unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
542 const struct ieee80211_reg_rule *rule)
544 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
545 const struct ieee80211_freq_range *freq_range_tmp;
546 const struct ieee80211_reg_rule *tmp;
547 u32 start_freq, end_freq, idx, no;
549 for (idx = 0; idx < rd->n_reg_rules; idx++)
550 if (rule == &rd->reg_rules[idx])
553 if (idx == rd->n_reg_rules)
560 tmp = &rd->reg_rules[--no];
561 freq_range_tmp = &tmp->freq_range;
563 if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
566 freq_range = freq_range_tmp;
569 start_freq = freq_range->start_freq_khz;
572 freq_range = &rule->freq_range;
575 while (no < rd->n_reg_rules - 1) {
576 tmp = &rd->reg_rules[++no];
577 freq_range_tmp = &tmp->freq_range;
579 if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
582 freq_range = freq_range_tmp;
585 end_freq = freq_range->end_freq_khz;
587 return end_freq - start_freq;
590 /* Sanity check on a regulatory rule */
591 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
593 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
596 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
599 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
602 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
604 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
605 freq_range->max_bandwidth_khz > freq_diff)
611 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
613 const struct ieee80211_reg_rule *reg_rule = NULL;
616 if (!rd->n_reg_rules)
619 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
622 for (i = 0; i < rd->n_reg_rules; i++) {
623 reg_rule = &rd->reg_rules[i];
624 if (!is_valid_reg_rule(reg_rule))
631 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
632 u32 center_freq_khz, u32 bw_khz)
634 u32 start_freq_khz, end_freq_khz;
636 start_freq_khz = center_freq_khz - (bw_khz/2);
637 end_freq_khz = center_freq_khz + (bw_khz/2);
639 if (start_freq_khz >= freq_range->start_freq_khz &&
640 end_freq_khz <= freq_range->end_freq_khz)
647 * freq_in_rule_band - tells us if a frequency is in a frequency band
648 * @freq_range: frequency rule we want to query
649 * @freq_khz: frequency we are inquiring about
651 * This lets us know if a specific frequency rule is or is not relevant to
652 * a specific frequency's band. Bands are device specific and artificial
653 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
654 * however it is safe for now to assume that a frequency rule should not be
655 * part of a frequency's band if the start freq or end freq are off by more
656 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
658 * This resolution can be lowered and should be considered as we add
659 * regulatory rule support for other "bands".
661 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
664 #define ONE_GHZ_IN_KHZ 1000000
666 * From 802.11ad: directional multi-gigabit (DMG):
667 * Pertaining to operation in a frequency band containing a channel
668 * with the Channel starting frequency above 45 GHz.
670 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
671 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
672 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
674 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
677 #undef ONE_GHZ_IN_KHZ
681 * Later on we can perhaps use the more restrictive DFS
682 * region but we don't have information for that yet so
683 * for now simply disallow conflicts.
685 static enum nl80211_dfs_regions
686 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
687 const enum nl80211_dfs_regions dfs_region2)
689 if (dfs_region1 != dfs_region2)
690 return NL80211_DFS_UNSET;
695 * Helper for regdom_intersect(), this does the real
696 * mathematical intersection fun
698 static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
699 const struct ieee80211_regdomain *rd2,
700 const struct ieee80211_reg_rule *rule1,
701 const struct ieee80211_reg_rule *rule2,
702 struct ieee80211_reg_rule *intersected_rule)
704 const struct ieee80211_freq_range *freq_range1, *freq_range2;
705 struct ieee80211_freq_range *freq_range;
706 const struct ieee80211_power_rule *power_rule1, *power_rule2;
707 struct ieee80211_power_rule *power_rule;
708 u32 freq_diff, max_bandwidth1, max_bandwidth2;
710 freq_range1 = &rule1->freq_range;
711 freq_range2 = &rule2->freq_range;
712 freq_range = &intersected_rule->freq_range;
714 power_rule1 = &rule1->power_rule;
715 power_rule2 = &rule2->power_rule;
716 power_rule = &intersected_rule->power_rule;
718 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
719 freq_range2->start_freq_khz);
720 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
721 freq_range2->end_freq_khz);
723 max_bandwidth1 = freq_range1->max_bandwidth_khz;
724 max_bandwidth2 = freq_range2->max_bandwidth_khz;
726 if (rule1->flags & NL80211_RRF_AUTO_BW)
727 max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
728 if (rule2->flags & NL80211_RRF_AUTO_BW)
729 max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
731 freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
733 intersected_rule->flags = rule1->flags | rule2->flags;
736 * In case NL80211_RRF_AUTO_BW requested for both rules
737 * set AUTO_BW in intersected rule also. Next we will
738 * calculate BW correctly in handle_channel function.
739 * In other case remove AUTO_BW flag while we calculate
740 * maximum bandwidth correctly and auto calculation is
743 if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
744 (rule2->flags & NL80211_RRF_AUTO_BW))
745 intersected_rule->flags |= NL80211_RRF_AUTO_BW;
747 intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
749 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
750 if (freq_range->max_bandwidth_khz > freq_diff)
751 freq_range->max_bandwidth_khz = freq_diff;
753 power_rule->max_eirp = min(power_rule1->max_eirp,
754 power_rule2->max_eirp);
755 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
756 power_rule2->max_antenna_gain);
758 if (!is_valid_reg_rule(intersected_rule))
765 * regdom_intersect - do the intersection between two regulatory domains
766 * @rd1: first regulatory domain
767 * @rd2: second regulatory domain
769 * Use this function to get the intersection between two regulatory domains.
770 * Once completed we will mark the alpha2 for the rd as intersected, "98",
771 * as no one single alpha2 can represent this regulatory domain.
773 * Returns a pointer to the regulatory domain structure which will hold the
774 * resulting intersection of rules between rd1 and rd2. We will
775 * kzalloc() this structure for you.
777 static struct ieee80211_regdomain *
778 regdom_intersect(const struct ieee80211_regdomain *rd1,
779 const struct ieee80211_regdomain *rd2)
783 unsigned int num_rules = 0, rule_idx = 0;
784 const struct ieee80211_reg_rule *rule1, *rule2;
785 struct ieee80211_reg_rule *intersected_rule;
786 struct ieee80211_regdomain *rd;
787 /* This is just a dummy holder to help us count */
788 struct ieee80211_reg_rule dummy_rule;
794 * First we get a count of the rules we'll need, then we actually
795 * build them. This is to so we can malloc() and free() a
796 * regdomain once. The reason we use reg_rules_intersect() here
797 * is it will return -EINVAL if the rule computed makes no sense.
798 * All rules that do check out OK are valid.
801 for (x = 0; x < rd1->n_reg_rules; x++) {
802 rule1 = &rd1->reg_rules[x];
803 for (y = 0; y < rd2->n_reg_rules; y++) {
804 rule2 = &rd2->reg_rules[y];
805 if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
814 size_of_regd = sizeof(struct ieee80211_regdomain) +
815 num_rules * sizeof(struct ieee80211_reg_rule);
817 rd = kzalloc(size_of_regd, GFP_KERNEL);
821 for (x = 0; x < rd1->n_reg_rules && rule_idx < num_rules; x++) {
822 rule1 = &rd1->reg_rules[x];
823 for (y = 0; y < rd2->n_reg_rules && rule_idx < num_rules; y++) {
824 rule2 = &rd2->reg_rules[y];
826 * This time around instead of using the stack lets
827 * write to the target rule directly saving ourselves
830 intersected_rule = &rd->reg_rules[rule_idx];
831 r = reg_rules_intersect(rd1, rd2, rule1, rule2,
834 * No need to memset here the intersected rule here as
835 * we're not using the stack anymore
843 if (rule_idx != num_rules) {
848 rd->n_reg_rules = num_rules;
851 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
858 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
859 * want to just have the channel structure use these
861 static u32 map_regdom_flags(u32 rd_flags)
863 u32 channel_flags = 0;
864 if (rd_flags & NL80211_RRF_NO_IR_ALL)
865 channel_flags |= IEEE80211_CHAN_NO_IR;
866 if (rd_flags & NL80211_RRF_DFS)
867 channel_flags |= IEEE80211_CHAN_RADAR;
868 if (rd_flags & NL80211_RRF_NO_OFDM)
869 channel_flags |= IEEE80211_CHAN_NO_OFDM;
870 return channel_flags;
873 static const struct ieee80211_reg_rule *
874 freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq,
875 const struct ieee80211_regdomain *regd)
878 bool band_rule_found = false;
879 bool bw_fits = false;
882 return ERR_PTR(-EINVAL);
884 for (i = 0; i < regd->n_reg_rules; i++) {
885 const struct ieee80211_reg_rule *rr;
886 const struct ieee80211_freq_range *fr = NULL;
888 rr = ®d->reg_rules[i];
889 fr = &rr->freq_range;
892 * We only need to know if one frequency rule was
893 * was in center_freq's band, that's enough, so lets
894 * not overwrite it once found
896 if (!band_rule_found)
897 band_rule_found = freq_in_rule_band(fr, center_freq);
899 bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20));
901 if (band_rule_found && bw_fits)
905 if (!band_rule_found)
906 return ERR_PTR(-ERANGE);
908 return ERR_PTR(-EINVAL);
911 const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
914 const struct ieee80211_regdomain *regd;
916 regd = reg_get_regdomain(wiphy);
918 return freq_reg_info_regd(wiphy, center_freq, regd);
920 EXPORT_SYMBOL(freq_reg_info);
922 const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
925 case NL80211_REGDOM_SET_BY_CORE:
927 case NL80211_REGDOM_SET_BY_USER:
929 case NL80211_REGDOM_SET_BY_DRIVER:
931 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
938 EXPORT_SYMBOL(reg_initiator_name);
940 #ifdef CONFIG_CFG80211_REG_DEBUG
941 static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain *regd,
942 struct ieee80211_channel *chan,
943 const struct ieee80211_reg_rule *reg_rule)
945 const struct ieee80211_power_rule *power_rule;
946 const struct ieee80211_freq_range *freq_range;
947 char max_antenna_gain[32], bw[32];
949 power_rule = ®_rule->power_rule;
950 freq_range = ®_rule->freq_range;
952 if (!power_rule->max_antenna_gain)
953 snprintf(max_antenna_gain, sizeof(max_antenna_gain), "N/A");
955 snprintf(max_antenna_gain, sizeof(max_antenna_gain), "%d",
956 power_rule->max_antenna_gain);
958 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
959 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
960 freq_range->max_bandwidth_khz,
961 reg_get_max_bandwidth(regd, reg_rule));
963 snprintf(bw, sizeof(bw), "%d KHz",
964 freq_range->max_bandwidth_khz);
966 REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
969 REG_DBG_PRINT("%d KHz - %d KHz @ %s), (%s mBi, %d mBm)\n",
970 freq_range->start_freq_khz, freq_range->end_freq_khz,
971 bw, max_antenna_gain,
972 power_rule->max_eirp);
975 static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain *regd,
976 struct ieee80211_channel *chan,
977 const struct ieee80211_reg_rule *reg_rule)
984 * Note that right now we assume the desired channel bandwidth
985 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
986 * per channel, the primary and the extension channel).
988 static void handle_channel(struct wiphy *wiphy,
989 enum nl80211_reg_initiator initiator,
990 struct ieee80211_channel *chan)
992 u32 flags, bw_flags = 0;
993 const struct ieee80211_reg_rule *reg_rule = NULL;
994 const struct ieee80211_power_rule *power_rule = NULL;
995 const struct ieee80211_freq_range *freq_range = NULL;
996 struct wiphy *request_wiphy = NULL;
997 struct regulatory_request *lr = get_last_request();
998 const struct ieee80211_regdomain *regd;
999 u32 max_bandwidth_khz;
1001 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1003 flags = chan->orig_flags;
1005 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
1006 if (IS_ERR(reg_rule)) {
1008 * We will disable all channels that do not match our
1009 * received regulatory rule unless the hint is coming
1010 * from a Country IE and the Country IE had no information
1011 * about a band. The IEEE 802.11 spec allows for an AP
1012 * to send only a subset of the regulatory rules allowed,
1013 * so an AP in the US that only supports 2.4 GHz may only send
1014 * a country IE with information for the 2.4 GHz band
1015 * while 5 GHz is still supported.
1017 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1018 PTR_ERR(reg_rule) == -ERANGE)
1021 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1022 request_wiphy && request_wiphy == wiphy &&
1023 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1024 REG_DBG_PRINT("Disabling freq %d MHz for good\n",
1026 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1027 chan->flags = chan->orig_flags;
1029 REG_DBG_PRINT("Disabling freq %d MHz\n",
1031 chan->flags |= IEEE80211_CHAN_DISABLED;
1036 regd = reg_get_regdomain(wiphy);
1037 chan_reg_rule_print_dbg(regd, chan, reg_rule);
1039 power_rule = ®_rule->power_rule;
1040 freq_range = ®_rule->freq_range;
1042 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1043 /* Check if auto calculation requested */
1044 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
1045 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1047 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1048 bw_flags = IEEE80211_CHAN_NO_HT40;
1049 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1050 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1051 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1052 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1054 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1055 request_wiphy && request_wiphy == wiphy &&
1056 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1058 * This guarantees the driver's requested regulatory domain
1059 * will always be used as a base for further regulatory
1062 chan->flags = chan->orig_flags =
1063 map_regdom_flags(reg_rule->flags) | bw_flags;
1064 chan->max_antenna_gain = chan->orig_mag =
1065 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1066 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
1067 (int) MBM_TO_DBM(power_rule->max_eirp);
1071 chan->dfs_state = NL80211_DFS_USABLE;
1072 chan->dfs_state_entered = jiffies;
1074 chan->beacon_found = false;
1075 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1076 chan->max_antenna_gain =
1077 min_t(int, chan->orig_mag,
1078 MBI_TO_DBI(power_rule->max_antenna_gain));
1079 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1080 if (chan->orig_mpwr) {
1082 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1083 * will always follow the passed country IE power settings.
1085 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1086 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
1087 chan->max_power = chan->max_reg_power;
1089 chan->max_power = min(chan->orig_mpwr,
1090 chan->max_reg_power);
1092 chan->max_power = chan->max_reg_power;
1095 static void handle_band(struct wiphy *wiphy,
1096 enum nl80211_reg_initiator initiator,
1097 struct ieee80211_supported_band *sband)
1104 for (i = 0; i < sband->n_channels; i++)
1105 handle_channel(wiphy, initiator, &sband->channels[i]);
1108 static bool reg_request_cell_base(struct regulatory_request *request)
1110 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1112 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1115 bool reg_last_request_cell_base(void)
1117 return reg_request_cell_base(get_last_request());
1120 #ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
1121 /* Core specific check */
1122 static enum reg_request_treatment
1123 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1125 struct regulatory_request *lr = get_last_request();
1127 if (!reg_num_devs_support_basehint)
1128 return REG_REQ_IGNORE;
1130 if (reg_request_cell_base(lr) &&
1131 !regdom_changes(pending_request->alpha2))
1132 return REG_REQ_ALREADY_SET;
1137 /* Device specific check */
1138 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1140 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1143 static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
1145 return REG_REQ_IGNORE;
1148 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1154 static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1156 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1157 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1162 static bool ignore_reg_update(struct wiphy *wiphy,
1163 enum nl80211_reg_initiator initiator)
1165 struct regulatory_request *lr = get_last_request();
1168 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1169 "since last_request is not set\n",
1170 reg_initiator_name(initiator));
1174 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1175 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1176 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1177 "since the driver uses its own custom "
1178 "regulatory domain\n",
1179 reg_initiator_name(initiator));
1184 * wiphy->regd will be set once the device has its own
1185 * desired regulatory domain set
1187 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1188 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1189 !is_world_regdom(lr->alpha2)) {
1190 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1191 "since the driver requires its own regulatory "
1192 "domain to be set first\n",
1193 reg_initiator_name(initiator));
1197 if (reg_request_cell_base(lr))
1198 return reg_dev_ignore_cell_hint(wiphy);
1203 static bool reg_is_world_roaming(struct wiphy *wiphy)
1205 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1206 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1207 struct regulatory_request *lr = get_last_request();
1209 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1212 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1213 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1219 static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1220 struct reg_beacon *reg_beacon)
1222 struct ieee80211_supported_band *sband;
1223 struct ieee80211_channel *chan;
1224 bool channel_changed = false;
1225 struct ieee80211_channel chan_before;
1227 sband = wiphy->bands[reg_beacon->chan.band];
1228 chan = &sband->channels[chan_idx];
1230 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1233 if (chan->beacon_found)
1236 chan->beacon_found = true;
1238 if (!reg_is_world_roaming(wiphy))
1241 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1244 chan_before.center_freq = chan->center_freq;
1245 chan_before.flags = chan->flags;
1247 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1248 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1249 channel_changed = true;
1252 if (channel_changed)
1253 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1257 * Called when a scan on a wiphy finds a beacon on
1260 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1261 struct reg_beacon *reg_beacon)
1264 struct ieee80211_supported_band *sband;
1266 if (!wiphy->bands[reg_beacon->chan.band])
1269 sband = wiphy->bands[reg_beacon->chan.band];
1271 for (i = 0; i < sband->n_channels; i++)
1272 handle_reg_beacon(wiphy, i, reg_beacon);
1276 * Called upon reg changes or a new wiphy is added
1278 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1281 struct ieee80211_supported_band *sband;
1282 struct reg_beacon *reg_beacon;
1284 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1285 if (!wiphy->bands[reg_beacon->chan.band])
1287 sband = wiphy->bands[reg_beacon->chan.band];
1288 for (i = 0; i < sband->n_channels; i++)
1289 handle_reg_beacon(wiphy, i, reg_beacon);
1293 /* Reap the advantages of previously found beacons */
1294 static void reg_process_beacons(struct wiphy *wiphy)
1297 * Means we are just firing up cfg80211, so no beacons would
1298 * have been processed yet.
1302 wiphy_update_beacon_reg(wiphy);
1305 static bool is_ht40_allowed(struct ieee80211_channel *chan)
1309 if (chan->flags & IEEE80211_CHAN_DISABLED)
1311 /* This would happen when regulatory rules disallow HT40 completely */
1312 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
1317 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1318 struct ieee80211_channel *channel)
1320 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
1321 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1324 if (!is_ht40_allowed(channel)) {
1325 channel->flags |= IEEE80211_CHAN_NO_HT40;
1330 * We need to ensure the extension channels exist to
1331 * be able to use HT40- or HT40+, this finds them (or not)
1333 for (i = 0; i < sband->n_channels; i++) {
1334 struct ieee80211_channel *c = &sband->channels[i];
1336 if (c->center_freq == (channel->center_freq - 20))
1338 if (c->center_freq == (channel->center_freq + 20))
1343 * Please note that this assumes target bandwidth is 20 MHz,
1344 * if that ever changes we also need to change the below logic
1345 * to include that as well.
1347 if (!is_ht40_allowed(channel_before))
1348 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1350 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1352 if (!is_ht40_allowed(channel_after))
1353 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1355 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1358 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1359 struct ieee80211_supported_band *sband)
1366 for (i = 0; i < sband->n_channels; i++)
1367 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
1370 static void reg_process_ht_flags(struct wiphy *wiphy)
1372 enum ieee80211_band band;
1377 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1378 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
1381 static void reg_call_notifier(struct wiphy *wiphy,
1382 struct regulatory_request *request)
1384 if (wiphy->reg_notifier)
1385 wiphy->reg_notifier(wiphy, request);
1388 static void wiphy_update_regulatory(struct wiphy *wiphy,
1389 enum nl80211_reg_initiator initiator)
1391 enum ieee80211_band band;
1392 struct regulatory_request *lr = get_last_request();
1394 if (ignore_reg_update(wiphy, initiator)) {
1396 * Regulatory updates set by CORE are ignored for custom
1397 * regulatory cards. Let us notify the changes to the driver,
1398 * as some drivers used this to restore its orig_* reg domain.
1400 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1401 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1402 reg_call_notifier(wiphy, lr);
1406 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
1408 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1409 handle_band(wiphy, initiator, wiphy->bands[band]);
1411 reg_process_beacons(wiphy);
1412 reg_process_ht_flags(wiphy);
1413 reg_call_notifier(wiphy, lr);
1416 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1418 struct cfg80211_registered_device *rdev;
1419 struct wiphy *wiphy;
1423 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1424 wiphy = &rdev->wiphy;
1425 wiphy_update_regulatory(wiphy, initiator);
1429 static void handle_channel_custom(struct wiphy *wiphy,
1430 struct ieee80211_channel *chan,
1431 const struct ieee80211_regdomain *regd)
1434 const struct ieee80211_reg_rule *reg_rule = NULL;
1435 const struct ieee80211_power_rule *power_rule = NULL;
1436 const struct ieee80211_freq_range *freq_range = NULL;
1437 u32 max_bandwidth_khz;
1439 reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1442 if (IS_ERR(reg_rule)) {
1443 REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1445 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1446 chan->flags = chan->orig_flags;
1450 chan_reg_rule_print_dbg(regd, chan, reg_rule);
1452 power_rule = ®_rule->power_rule;
1453 freq_range = ®_rule->freq_range;
1455 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1456 /* Check if auto calculation requested */
1457 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
1458 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1460 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1461 bw_flags = IEEE80211_CHAN_NO_HT40;
1462 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1463 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1464 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1465 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1467 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1468 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1469 chan->max_reg_power = chan->max_power =
1470 (int) MBM_TO_DBM(power_rule->max_eirp);
1473 static void handle_band_custom(struct wiphy *wiphy,
1474 struct ieee80211_supported_band *sband,
1475 const struct ieee80211_regdomain *regd)
1482 for (i = 0; i < sband->n_channels; i++)
1483 handle_channel_custom(wiphy, &sband->channels[i], regd);
1486 /* Used by drivers prior to wiphy registration */
1487 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1488 const struct ieee80211_regdomain *regd)
1490 enum ieee80211_band band;
1491 unsigned int bands_set = 0;
1493 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
1494 "wiphy should have REGULATORY_CUSTOM_REG\n");
1495 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
1497 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1498 if (!wiphy->bands[band])
1500 handle_band_custom(wiphy, wiphy->bands[band], regd);
1505 * no point in calling this if it won't have any effect
1506 * on your device's supported bands.
1508 WARN_ON(!bands_set);
1510 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1512 static void reg_set_request_processed(void)
1514 bool need_more_processing = false;
1515 struct regulatory_request *lr = get_last_request();
1517 lr->processed = true;
1519 spin_lock(®_requests_lock);
1520 if (!list_empty(®_requests_list))
1521 need_more_processing = true;
1522 spin_unlock(®_requests_lock);
1524 if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
1525 cancel_delayed_work(®_timeout);
1527 if (need_more_processing)
1528 schedule_work(®_work);
1532 * reg_process_hint_core - process core regulatory requests
1533 * @pending_request: a pending core regulatory request
1535 * The wireless subsystem can use this function to process
1536 * a regulatory request issued by the regulatory core.
1538 * Returns one of the different reg request treatment values.
1540 static enum reg_request_treatment
1541 reg_process_hint_core(struct regulatory_request *core_request)
1544 core_request->intersect = false;
1545 core_request->processed = false;
1547 reg_update_last_request(core_request);
1549 return reg_call_crda(core_request);
1552 static enum reg_request_treatment
1553 __reg_process_hint_user(struct regulatory_request *user_request)
1555 struct regulatory_request *lr = get_last_request();
1557 if (reg_request_cell_base(user_request))
1558 return reg_ignore_cell_hint(user_request);
1560 if (reg_request_cell_base(lr))
1561 return REG_REQ_IGNORE;
1563 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1564 return REG_REQ_INTERSECT;
1566 * If the user knows better the user should set the regdom
1567 * to their country before the IE is picked up
1569 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
1571 return REG_REQ_IGNORE;
1573 * Process user requests only after previous user/driver/core
1574 * requests have been processed
1576 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
1577 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1578 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
1579 regdom_changes(lr->alpha2))
1580 return REG_REQ_IGNORE;
1582 if (!regdom_changes(user_request->alpha2))
1583 return REG_REQ_ALREADY_SET;
1589 * reg_process_hint_user - process user regulatory requests
1590 * @user_request: a pending user regulatory request
1592 * The wireless subsystem can use this function to process
1593 * a regulatory request initiated by userspace.
1595 * Returns one of the different reg request treatment values.
1597 static enum reg_request_treatment
1598 reg_process_hint_user(struct regulatory_request *user_request)
1600 enum reg_request_treatment treatment;
1602 treatment = __reg_process_hint_user(user_request);
1603 if (treatment == REG_REQ_IGNORE ||
1604 treatment == REG_REQ_ALREADY_SET) {
1605 kfree(user_request);
1609 user_request->intersect = treatment == REG_REQ_INTERSECT;
1610 user_request->processed = false;
1612 reg_update_last_request(user_request);
1614 user_alpha2[0] = user_request->alpha2[0];
1615 user_alpha2[1] = user_request->alpha2[1];
1617 return reg_call_crda(user_request);
1620 static enum reg_request_treatment
1621 __reg_process_hint_driver(struct regulatory_request *driver_request)
1623 struct regulatory_request *lr = get_last_request();
1625 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
1626 if (regdom_changes(driver_request->alpha2))
1628 return REG_REQ_ALREADY_SET;
1632 * This would happen if you unplug and plug your card
1633 * back in or if you add a new device for which the previously
1634 * loaded card also agrees on the regulatory domain.
1636 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1637 !regdom_changes(driver_request->alpha2))
1638 return REG_REQ_ALREADY_SET;
1640 return REG_REQ_INTERSECT;
1644 * reg_process_hint_driver - process driver regulatory requests
1645 * @driver_request: a pending driver regulatory request
1647 * The wireless subsystem can use this function to process
1648 * a regulatory request issued by an 802.11 driver.
1650 * Returns one of the different reg request treatment values.
1652 static enum reg_request_treatment
1653 reg_process_hint_driver(struct wiphy *wiphy,
1654 struct regulatory_request *driver_request)
1656 const struct ieee80211_regdomain *regd;
1657 enum reg_request_treatment treatment;
1659 treatment = __reg_process_hint_driver(driver_request);
1661 switch (treatment) {
1664 case REG_REQ_IGNORE:
1665 kfree(driver_request);
1667 case REG_REQ_INTERSECT:
1669 case REG_REQ_ALREADY_SET:
1670 regd = reg_copy_regd(get_cfg80211_regdom());
1672 kfree(driver_request);
1673 return REG_REQ_IGNORE;
1675 rcu_assign_pointer(wiphy->regd, regd);
1679 driver_request->intersect = treatment == REG_REQ_INTERSECT;
1680 driver_request->processed = false;
1682 reg_update_last_request(driver_request);
1685 * Since CRDA will not be called in this case as we already
1686 * have applied the requested regulatory domain before we just
1687 * inform userspace we have processed the request
1689 if (treatment == REG_REQ_ALREADY_SET) {
1690 nl80211_send_reg_change_event(driver_request);
1691 reg_set_request_processed();
1695 return reg_call_crda(driver_request);
1698 static enum reg_request_treatment
1699 __reg_process_hint_country_ie(struct wiphy *wiphy,
1700 struct regulatory_request *country_ie_request)
1702 struct wiphy *last_wiphy = NULL;
1703 struct regulatory_request *lr = get_last_request();
1705 if (reg_request_cell_base(lr)) {
1706 /* Trust a Cell base station over the AP's country IE */
1707 if (regdom_changes(country_ie_request->alpha2))
1708 return REG_REQ_IGNORE;
1709 return REG_REQ_ALREADY_SET;
1711 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
1712 return REG_REQ_IGNORE;
1715 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
1718 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
1721 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1723 if (last_wiphy != wiphy) {
1725 * Two cards with two APs claiming different
1726 * Country IE alpha2s. We could
1727 * intersect them, but that seems unlikely
1728 * to be correct. Reject second one for now.
1730 if (regdom_changes(country_ie_request->alpha2))
1731 return REG_REQ_IGNORE;
1732 return REG_REQ_ALREADY_SET;
1735 * Two consecutive Country IE hints on the same wiphy.
1736 * This should be picked up early by the driver/stack
1738 if (WARN_ON(regdom_changes(country_ie_request->alpha2)))
1740 return REG_REQ_ALREADY_SET;
1744 * reg_process_hint_country_ie - process regulatory requests from country IEs
1745 * @country_ie_request: a regulatory request from a country IE
1747 * The wireless subsystem can use this function to process
1748 * a regulatory request issued by a country Information Element.
1750 * Returns one of the different reg request treatment values.
1752 static enum reg_request_treatment
1753 reg_process_hint_country_ie(struct wiphy *wiphy,
1754 struct regulatory_request *country_ie_request)
1756 enum reg_request_treatment treatment;
1758 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
1760 switch (treatment) {
1763 case REG_REQ_IGNORE:
1765 case REG_REQ_ALREADY_SET:
1766 kfree(country_ie_request);
1768 case REG_REQ_INTERSECT:
1769 kfree(country_ie_request);
1771 * This doesn't happen yet, not sure we
1772 * ever want to support it for this case.
1774 WARN_ONCE(1, "Unexpected intersection for country IEs");
1775 return REG_REQ_IGNORE;
1778 country_ie_request->intersect = false;
1779 country_ie_request->processed = false;
1781 reg_update_last_request(country_ie_request);
1783 return reg_call_crda(country_ie_request);
1786 /* This processes *all* regulatory hints */
1787 static void reg_process_hint(struct regulatory_request *reg_request)
1789 struct wiphy *wiphy = NULL;
1790 enum reg_request_treatment treatment;
1792 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
1793 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1795 switch (reg_request->initiator) {
1796 case NL80211_REGDOM_SET_BY_CORE:
1797 reg_process_hint_core(reg_request);
1799 case NL80211_REGDOM_SET_BY_USER:
1800 treatment = reg_process_hint_user(reg_request);
1801 if (treatment == REG_REQ_IGNORE ||
1802 treatment == REG_REQ_ALREADY_SET)
1804 queue_delayed_work(system_power_efficient_wq,
1805 ®_timeout, msecs_to_jiffies(3142));
1807 case NL80211_REGDOM_SET_BY_DRIVER:
1810 treatment = reg_process_hint_driver(wiphy, reg_request);
1812 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1815 treatment = reg_process_hint_country_ie(wiphy, reg_request);
1818 WARN(1, "invalid initiator %d\n", reg_request->initiator);
1822 /* This is required so that the orig_* parameters are saved */
1823 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
1824 wiphy->regulatory_flags & REGULATORY_STRICT_REG)
1825 wiphy_update_regulatory(wiphy, reg_request->initiator);
1834 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1835 * Regulatory hints come on a first come first serve basis and we
1836 * must process each one atomically.
1838 static void reg_process_pending_hints(void)
1840 struct regulatory_request *reg_request, *lr;
1842 lr = get_last_request();
1844 /* When last_request->processed becomes true this will be rescheduled */
1845 if (lr && !lr->processed) {
1846 REG_DBG_PRINT("Pending regulatory request, waiting for it to be processed...\n");
1850 spin_lock(®_requests_lock);
1852 if (list_empty(®_requests_list)) {
1853 spin_unlock(®_requests_lock);
1857 reg_request = list_first_entry(®_requests_list,
1858 struct regulatory_request,
1860 list_del_init(®_request->list);
1862 spin_unlock(®_requests_lock);
1864 reg_process_hint(reg_request);
1867 /* Processes beacon hints -- this has nothing to do with country IEs */
1868 static void reg_process_pending_beacon_hints(void)
1870 struct cfg80211_registered_device *rdev;
1871 struct reg_beacon *pending_beacon, *tmp;
1873 /* This goes through the _pending_ beacon list */
1874 spin_lock_bh(®_pending_beacons_lock);
1876 list_for_each_entry_safe(pending_beacon, tmp,
1877 ®_pending_beacons, list) {
1878 list_del_init(&pending_beacon->list);
1880 /* Applies the beacon hint to current wiphys */
1881 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1882 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1884 /* Remembers the beacon hint for new wiphys or reg changes */
1885 list_add_tail(&pending_beacon->list, ®_beacon_list);
1888 spin_unlock_bh(®_pending_beacons_lock);
1891 static void reg_todo(struct work_struct *work)
1894 reg_process_pending_hints();
1895 reg_process_pending_beacon_hints();
1899 static void queue_regulatory_request(struct regulatory_request *request)
1901 request->alpha2[0] = toupper(request->alpha2[0]);
1902 request->alpha2[1] = toupper(request->alpha2[1]);
1904 spin_lock(®_requests_lock);
1905 list_add_tail(&request->list, ®_requests_list);
1906 spin_unlock(®_requests_lock);
1908 schedule_work(®_work);
1912 * Core regulatory hint -- happens during cfg80211_init()
1913 * and when we restore regulatory settings.
1915 static int regulatory_hint_core(const char *alpha2)
1917 struct regulatory_request *request;
1919 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1923 request->alpha2[0] = alpha2[0];
1924 request->alpha2[1] = alpha2[1];
1925 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1927 queue_regulatory_request(request);
1933 int regulatory_hint_user(const char *alpha2,
1934 enum nl80211_user_reg_hint_type user_reg_hint_type)
1936 struct regulatory_request *request;
1938 if (WARN_ON(!alpha2))
1941 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1945 request->wiphy_idx = WIPHY_IDX_INVALID;
1946 request->alpha2[0] = alpha2[0];
1947 request->alpha2[1] = alpha2[1];
1948 request->initiator = NL80211_REGDOM_SET_BY_USER;
1949 request->user_reg_hint_type = user_reg_hint_type;
1951 queue_regulatory_request(request);
1957 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1959 struct regulatory_request *request;
1961 if (WARN_ON(!alpha2 || !wiphy))
1964 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
1966 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1970 request->wiphy_idx = get_wiphy_idx(wiphy);
1972 request->alpha2[0] = alpha2[0];
1973 request->alpha2[1] = alpha2[1];
1974 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1976 queue_regulatory_request(request);
1980 EXPORT_SYMBOL(regulatory_hint);
1982 void regulatory_hint_country_ie(struct wiphy *wiphy, enum ieee80211_band band,
1983 const u8 *country_ie, u8 country_ie_len)
1986 enum environment_cap env = ENVIRON_ANY;
1987 struct regulatory_request *request = NULL, *lr;
1989 /* IE len must be evenly divisible by 2 */
1990 if (country_ie_len & 0x01)
1993 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1996 request = kzalloc(sizeof(*request), GFP_KERNEL);
2000 alpha2[0] = country_ie[0];
2001 alpha2[1] = country_ie[1];
2003 if (country_ie[2] == 'I')
2004 env = ENVIRON_INDOOR;
2005 else if (country_ie[2] == 'O')
2006 env = ENVIRON_OUTDOOR;
2009 lr = get_last_request();
2015 * We will run this only upon a successful connection on cfg80211.
2016 * We leave conflict resolution to the workqueue, where can hold
2019 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
2020 lr->wiphy_idx != WIPHY_IDX_INVALID)
2023 request->wiphy_idx = get_wiphy_idx(wiphy);
2024 request->alpha2[0] = alpha2[0];
2025 request->alpha2[1] = alpha2[1];
2026 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
2027 request->country_ie_env = env;
2029 queue_regulatory_request(request);
2036 static void restore_alpha2(char *alpha2, bool reset_user)
2038 /* indicates there is no alpha2 to consider for restoration */
2042 /* The user setting has precedence over the module parameter */
2043 if (is_user_regdom_saved()) {
2044 /* Unless we're asked to ignore it and reset it */
2046 REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
2047 user_alpha2[0] = '9';
2048 user_alpha2[1] = '7';
2051 * If we're ignoring user settings, we still need to
2052 * check the module parameter to ensure we put things
2053 * back as they were for a full restore.
2055 if (!is_world_regdom(ieee80211_regdom)) {
2056 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2057 ieee80211_regdom[0], ieee80211_regdom[1]);
2058 alpha2[0] = ieee80211_regdom[0];
2059 alpha2[1] = ieee80211_regdom[1];
2062 REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
2063 user_alpha2[0], user_alpha2[1]);
2064 alpha2[0] = user_alpha2[0];
2065 alpha2[1] = user_alpha2[1];
2067 } else if (!is_world_regdom(ieee80211_regdom)) {
2068 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2069 ieee80211_regdom[0], ieee80211_regdom[1]);
2070 alpha2[0] = ieee80211_regdom[0];
2071 alpha2[1] = ieee80211_regdom[1];
2073 REG_DBG_PRINT("Restoring regulatory settings\n");
2076 static void restore_custom_reg_settings(struct wiphy *wiphy)
2078 struct ieee80211_supported_band *sband;
2079 enum ieee80211_band band;
2080 struct ieee80211_channel *chan;
2083 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
2084 sband = wiphy->bands[band];
2087 for (i = 0; i < sband->n_channels; i++) {
2088 chan = &sband->channels[i];
2089 chan->flags = chan->orig_flags;
2090 chan->max_antenna_gain = chan->orig_mag;
2091 chan->max_power = chan->orig_mpwr;
2092 chan->beacon_found = false;
2098 * Restoring regulatory settings involves ingoring any
2099 * possibly stale country IE information and user regulatory
2100 * settings if so desired, this includes any beacon hints
2101 * learned as we could have traveled outside to another country
2102 * after disconnection. To restore regulatory settings we do
2103 * exactly what we did at bootup:
2105 * - send a core regulatory hint
2106 * - send a user regulatory hint if applicable
2108 * Device drivers that send a regulatory hint for a specific country
2109 * keep their own regulatory domain on wiphy->regd so that does does
2110 * not need to be remembered.
2112 static void restore_regulatory_settings(bool reset_user)
2115 char world_alpha2[2];
2116 struct reg_beacon *reg_beacon, *btmp;
2117 struct regulatory_request *reg_request, *tmp;
2118 LIST_HEAD(tmp_reg_req_list);
2119 struct cfg80211_registered_device *rdev;
2123 reset_regdomains(true, &world_regdom);
2124 restore_alpha2(alpha2, reset_user);
2127 * If there's any pending requests we simply
2128 * stash them to a temporary pending queue and
2129 * add then after we've restored regulatory
2132 spin_lock(®_requests_lock);
2133 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
2134 if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER)
2136 list_move_tail(®_request->list, &tmp_reg_req_list);
2138 spin_unlock(®_requests_lock);
2140 /* Clear beacon hints */
2141 spin_lock_bh(®_pending_beacons_lock);
2142 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2143 list_del(®_beacon->list);
2146 spin_unlock_bh(®_pending_beacons_lock);
2148 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2149 list_del(®_beacon->list);
2153 /* First restore to the basic regulatory settings */
2154 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
2155 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
2157 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2158 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
2159 restore_custom_reg_settings(&rdev->wiphy);
2162 regulatory_hint_core(world_alpha2);
2165 * This restores the ieee80211_regdom module parameter
2166 * preference or the last user requested regulatory
2167 * settings, user regulatory settings takes precedence.
2169 if (is_an_alpha2(alpha2))
2170 regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
2172 spin_lock(®_requests_lock);
2173 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
2174 spin_unlock(®_requests_lock);
2176 REG_DBG_PRINT("Kicking the queue\n");
2178 schedule_work(®_work);
2181 void regulatory_hint_disconnect(void)
2183 REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
2184 restore_regulatory_settings(false);
2187 static bool freq_is_chan_12_13_14(u16 freq)
2189 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
2190 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
2191 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
2196 static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
2198 struct reg_beacon *pending_beacon;
2200 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
2201 if (beacon_chan->center_freq ==
2202 pending_beacon->chan.center_freq)
2207 int regulatory_hint_found_beacon(struct wiphy *wiphy,
2208 struct ieee80211_channel *beacon_chan,
2211 struct reg_beacon *reg_beacon;
2214 if (beacon_chan->beacon_found ||
2215 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
2216 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
2217 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
2220 spin_lock_bh(®_pending_beacons_lock);
2221 processing = pending_reg_beacon(beacon_chan);
2222 spin_unlock_bh(®_pending_beacons_lock);
2227 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
2231 REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
2232 beacon_chan->center_freq,
2233 ieee80211_frequency_to_channel(beacon_chan->center_freq),
2236 memcpy(®_beacon->chan, beacon_chan,
2237 sizeof(struct ieee80211_channel));
2240 * Since we can be called from BH or and non-BH context
2241 * we must use spin_lock_bh()
2243 spin_lock_bh(®_pending_beacons_lock);
2244 list_add_tail(®_beacon->list, ®_pending_beacons);
2245 spin_unlock_bh(®_pending_beacons_lock);
2247 schedule_work(®_work);
2252 static void print_rd_rules(const struct ieee80211_regdomain *rd)
2255 const struct ieee80211_reg_rule *reg_rule = NULL;
2256 const struct ieee80211_freq_range *freq_range = NULL;
2257 const struct ieee80211_power_rule *power_rule = NULL;
2260 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
2262 for (i = 0; i < rd->n_reg_rules; i++) {
2263 reg_rule = &rd->reg_rules[i];
2264 freq_range = ®_rule->freq_range;
2265 power_rule = ®_rule->power_rule;
2267 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
2268 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
2269 freq_range->max_bandwidth_khz,
2270 reg_get_max_bandwidth(rd, reg_rule));
2272 snprintf(bw, sizeof(bw), "%d KHz",
2273 freq_range->max_bandwidth_khz);
2276 * There may not be documentation for max antenna gain
2277 * in certain regions
2279 if (power_rule->max_antenna_gain)
2280 pr_info(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm)\n",
2281 freq_range->start_freq_khz,
2282 freq_range->end_freq_khz,
2284 power_rule->max_antenna_gain,
2285 power_rule->max_eirp);
2287 pr_info(" (%d KHz - %d KHz @ %s), (N/A, %d mBm)\n",
2288 freq_range->start_freq_khz,
2289 freq_range->end_freq_khz,
2291 power_rule->max_eirp);
2295 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
2297 switch (dfs_region) {
2298 case NL80211_DFS_UNSET:
2299 case NL80211_DFS_FCC:
2300 case NL80211_DFS_ETSI:
2301 case NL80211_DFS_JP:
2304 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2310 static void print_regdomain(const struct ieee80211_regdomain *rd)
2312 struct regulatory_request *lr = get_last_request();
2314 if (is_intersected_alpha2(rd->alpha2)) {
2315 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2316 struct cfg80211_registered_device *rdev;
2317 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
2319 pr_info("Current regulatory domain updated by AP to: %c%c\n",
2320 rdev->country_ie_alpha2[0],
2321 rdev->country_ie_alpha2[1]);
2323 pr_info("Current regulatory domain intersected:\n");
2325 pr_info("Current regulatory domain intersected:\n");
2326 } else if (is_world_regdom(rd->alpha2)) {
2327 pr_info("World regulatory domain updated:\n");
2329 if (is_unknown_alpha2(rd->alpha2))
2330 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
2332 if (reg_request_cell_base(lr))
2333 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
2334 rd->alpha2[0], rd->alpha2[1]);
2336 pr_info("Regulatory domain changed to country: %c%c\n",
2337 rd->alpha2[0], rd->alpha2[1]);
2341 pr_info(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
2345 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2347 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
2351 static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
2353 if (!is_world_regdom(rd->alpha2))
2355 update_world_regdomain(rd);
2359 static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
2360 struct regulatory_request *user_request)
2362 const struct ieee80211_regdomain *intersected_rd = NULL;
2364 if (is_world_regdom(rd->alpha2))
2367 if (!regdom_changes(rd->alpha2))
2370 if (!is_valid_rd(rd)) {
2371 pr_err("Invalid regulatory domain detected:\n");
2372 print_regdomain_info(rd);
2376 if (!user_request->intersect) {
2377 reset_regdomains(false, rd);
2381 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2382 if (!intersected_rd)
2387 reset_regdomains(false, intersected_rd);
2392 static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
2393 struct regulatory_request *driver_request)
2395 const struct ieee80211_regdomain *regd;
2396 const struct ieee80211_regdomain *intersected_rd = NULL;
2397 const struct ieee80211_regdomain *tmp;
2398 struct wiphy *request_wiphy;
2400 if (is_world_regdom(rd->alpha2))
2403 if (!regdom_changes(rd->alpha2))
2406 if (!is_valid_rd(rd)) {
2407 pr_err("Invalid regulatory domain detected:\n");
2408 print_regdomain_info(rd);
2412 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
2413 if (!request_wiphy) {
2414 queue_delayed_work(system_power_efficient_wq,
2419 if (!driver_request->intersect) {
2420 if (request_wiphy->regd)
2423 regd = reg_copy_regd(rd);
2425 return PTR_ERR(regd);
2427 rcu_assign_pointer(request_wiphy->regd, regd);
2428 reset_regdomains(false, rd);
2432 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2433 if (!intersected_rd)
2437 * We can trash what CRDA provided now.
2438 * However if a driver requested this specific regulatory
2439 * domain we keep it for its private use
2441 tmp = get_wiphy_regdom(request_wiphy);
2442 rcu_assign_pointer(request_wiphy->regd, rd);
2443 rcu_free_regdom(tmp);
2447 reset_regdomains(false, intersected_rd);
2452 static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
2453 struct regulatory_request *country_ie_request)
2455 struct wiphy *request_wiphy;
2457 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2458 !is_unknown_alpha2(rd->alpha2))
2462 * Lets only bother proceeding on the same alpha2 if the current
2463 * rd is non static (it means CRDA was present and was used last)
2464 * and the pending request came in from a country IE
2467 if (!is_valid_rd(rd)) {
2468 pr_err("Invalid regulatory domain detected:\n");
2469 print_regdomain_info(rd);
2473 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
2474 if (!request_wiphy) {
2475 queue_delayed_work(system_power_efficient_wq,
2480 if (country_ie_request->intersect)
2483 reset_regdomains(false, rd);
2488 * Use this call to set the current regulatory domain. Conflicts with
2489 * multiple drivers can be ironed out later. Caller must've already
2490 * kmalloc'd the rd structure.
2492 int set_regdom(const struct ieee80211_regdomain *rd)
2494 struct regulatory_request *lr;
2495 bool user_reset = false;
2498 if (!reg_is_valid_request(rd->alpha2)) {
2503 lr = get_last_request();
2505 /* Note that this doesn't update the wiphys, this is done below */
2506 switch (lr->initiator) {
2507 case NL80211_REGDOM_SET_BY_CORE:
2508 r = reg_set_rd_core(rd);
2510 case NL80211_REGDOM_SET_BY_USER:
2511 r = reg_set_rd_user(rd, lr);
2514 case NL80211_REGDOM_SET_BY_DRIVER:
2515 r = reg_set_rd_driver(rd, lr);
2517 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2518 r = reg_set_rd_country_ie(rd, lr);
2521 WARN(1, "invalid initiator %d\n", lr->initiator);
2528 reg_set_request_processed();
2531 /* Back to world regulatory in case of errors */
2532 restore_regulatory_settings(user_reset);
2539 /* This would make this whole thing pointless */
2540 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
2543 /* update all wiphys now with the new established regulatory domain */
2544 update_all_wiphy_regulatory(lr->initiator);
2546 print_regdomain(get_cfg80211_regdom());
2548 nl80211_send_reg_change_event(lr);
2550 reg_set_request_processed();
2555 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2557 struct regulatory_request *lr;
2562 lr = get_last_request();
2563 if (lr && !lr->processed) {
2564 memcpy(alpha2, lr->alpha2, 2);
2570 return add_uevent_var(env, "COUNTRY=%c%c",
2571 alpha2[0], alpha2[1]);
2575 void wiphy_regulatory_register(struct wiphy *wiphy)
2577 struct regulatory_request *lr;
2579 if (!reg_dev_ignore_cell_hint(wiphy))
2580 reg_num_devs_support_basehint++;
2582 lr = get_last_request();
2583 wiphy_update_regulatory(wiphy, lr->initiator);
2586 void wiphy_regulatory_deregister(struct wiphy *wiphy)
2588 struct wiphy *request_wiphy = NULL;
2589 struct regulatory_request *lr;
2591 lr = get_last_request();
2593 if (!reg_dev_ignore_cell_hint(wiphy))
2594 reg_num_devs_support_basehint--;
2596 rcu_free_regdom(get_wiphy_regdom(wiphy));
2597 rcu_assign_pointer(wiphy->regd, NULL);
2600 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2602 if (!request_wiphy || request_wiphy != wiphy)
2605 lr->wiphy_idx = WIPHY_IDX_INVALID;
2606 lr->country_ie_env = ENVIRON_ANY;
2609 static void reg_timeout_work(struct work_struct *work)
2611 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
2613 restore_regulatory_settings(true);
2617 int __init regulatory_init(void)
2621 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2622 if (IS_ERR(reg_pdev))
2623 return PTR_ERR(reg_pdev);
2625 reg_pdev->dev.type = ®_device_type;
2627 spin_lock_init(®_requests_lock);
2628 spin_lock_init(®_pending_beacons_lock);
2630 reg_regdb_size_check();
2632 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
2634 user_alpha2[0] = '9';
2635 user_alpha2[1] = '7';
2637 /* We always try to get an update for the static regdomain */
2638 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
2643 * N.B. kobject_uevent_env() can fail mainly for when we're out
2644 * memory which is handled and propagated appropriately above
2645 * but it can also fail during a netlink_broadcast() or during
2646 * early boot for call_usermodehelper(). For now treat these
2647 * errors as non-fatal.
2649 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2653 * Finally, if the user set the module parameter treat it
2656 if (!is_world_regdom(ieee80211_regdom))
2657 regulatory_hint_user(ieee80211_regdom,
2658 NL80211_USER_REG_HINT_USER);
2663 void regulatory_exit(void)
2665 struct regulatory_request *reg_request, *tmp;
2666 struct reg_beacon *reg_beacon, *btmp;
2668 cancel_work_sync(®_work);
2669 cancel_delayed_work_sync(®_timeout);
2671 /* Lock to suppress warnings */
2673 reset_regdomains(true, NULL);
2676 dev_set_uevent_suppress(®_pdev->dev, true);
2678 platform_device_unregister(reg_pdev);
2680 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2681 list_del(®_beacon->list);
2685 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2686 list_del(®_beacon->list);
2690 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
2691 list_del(®_request->list);