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 if (freq_range_tmp->max_bandwidth_khz)
569 freq_range = freq_range_tmp;
572 start_freq = freq_range->start_freq_khz;
575 freq_range = &rule->freq_range;
578 while (no < rd->n_reg_rules - 1) {
579 tmp = &rd->reg_rules[++no];
580 freq_range_tmp = &tmp->freq_range;
582 if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
585 if (freq_range_tmp->max_bandwidth_khz)
588 freq_range = freq_range_tmp;
591 end_freq = freq_range->end_freq_khz;
593 return end_freq - start_freq;
596 /* Sanity check on a regulatory rule */
597 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
599 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
602 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
605 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
608 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
610 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
611 freq_range->max_bandwidth_khz > freq_diff)
617 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
619 const struct ieee80211_reg_rule *reg_rule = NULL;
622 if (!rd->n_reg_rules)
625 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
628 for (i = 0; i < rd->n_reg_rules; i++) {
629 reg_rule = &rd->reg_rules[i];
630 if (!is_valid_reg_rule(reg_rule))
637 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
638 u32 center_freq_khz, u32 bw_khz)
640 u32 start_freq_khz, end_freq_khz;
642 start_freq_khz = center_freq_khz - (bw_khz/2);
643 end_freq_khz = center_freq_khz + (bw_khz/2);
645 if (start_freq_khz >= freq_range->start_freq_khz &&
646 end_freq_khz <= freq_range->end_freq_khz)
653 * freq_in_rule_band - tells us if a frequency is in a frequency band
654 * @freq_range: frequency rule we want to query
655 * @freq_khz: frequency we are inquiring about
657 * This lets us know if a specific frequency rule is or is not relevant to
658 * a specific frequency's band. Bands are device specific and artificial
659 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
660 * however it is safe for now to assume that a frequency rule should not be
661 * part of a frequency's band if the start freq or end freq are off by more
662 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
664 * This resolution can be lowered and should be considered as we add
665 * regulatory rule support for other "bands".
667 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
670 #define ONE_GHZ_IN_KHZ 1000000
672 * From 802.11ad: directional multi-gigabit (DMG):
673 * Pertaining to operation in a frequency band containing a channel
674 * with the Channel starting frequency above 45 GHz.
676 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
677 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
678 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
680 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
683 #undef ONE_GHZ_IN_KHZ
687 * Later on we can perhaps use the more restrictive DFS
688 * region but we don't have information for that yet so
689 * for now simply disallow conflicts.
691 static enum nl80211_dfs_regions
692 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
693 const enum nl80211_dfs_regions dfs_region2)
695 if (dfs_region1 != dfs_region2)
696 return NL80211_DFS_UNSET;
701 * Helper for regdom_intersect(), this does the real
702 * mathematical intersection fun
704 static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
705 const struct ieee80211_regdomain *rd2,
706 const struct ieee80211_reg_rule *rule1,
707 const struct ieee80211_reg_rule *rule2,
708 struct ieee80211_reg_rule *intersected_rule)
710 const struct ieee80211_freq_range *freq_range1, *freq_range2;
711 struct ieee80211_freq_range *freq_range;
712 const struct ieee80211_power_rule *power_rule1, *power_rule2;
713 struct ieee80211_power_rule *power_rule;
714 u32 freq_diff, max_bandwidth1, max_bandwidth2;
716 freq_range1 = &rule1->freq_range;
717 freq_range2 = &rule2->freq_range;
718 freq_range = &intersected_rule->freq_range;
720 power_rule1 = &rule1->power_rule;
721 power_rule2 = &rule2->power_rule;
722 power_rule = &intersected_rule->power_rule;
724 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
725 freq_range2->start_freq_khz);
726 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
727 freq_range2->end_freq_khz);
729 max_bandwidth1 = freq_range1->max_bandwidth_khz;
730 max_bandwidth2 = freq_range2->max_bandwidth_khz;
733 * In case max_bandwidth1 == 0 and max_bandwith2 == 0 set
734 * output bandwidth as 0 (auto calculation). Next we will
735 * calculate this correctly in handle_channel function.
736 * In other case calculate output bandwidth here.
738 if (max_bandwidth1 || max_bandwidth2) {
740 max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
742 max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
745 freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
747 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
748 if (freq_range->max_bandwidth_khz > freq_diff)
749 freq_range->max_bandwidth_khz = freq_diff;
751 power_rule->max_eirp = min(power_rule1->max_eirp,
752 power_rule2->max_eirp);
753 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
754 power_rule2->max_antenna_gain);
756 intersected_rule->flags = rule1->flags | rule2->flags;
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(struct ieee80211_channel *chan,
942 const struct ieee80211_reg_rule *reg_rule)
944 const struct ieee80211_power_rule *power_rule;
945 const struct ieee80211_freq_range *freq_range;
946 char max_antenna_gain[32];
948 power_rule = ®_rule->power_rule;
949 freq_range = ®_rule->freq_range;
951 if (!power_rule->max_antenna_gain)
952 snprintf(max_antenna_gain, 32, "N/A");
954 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
956 REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
959 REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
960 freq_range->start_freq_khz, freq_range->end_freq_khz,
961 freq_range->max_bandwidth_khz, max_antenna_gain,
962 power_rule->max_eirp);
965 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
966 const struct ieee80211_reg_rule *reg_rule)
973 * Note that right now we assume the desired channel bandwidth
974 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
975 * per channel, the primary and the extension channel).
977 static void handle_channel(struct wiphy *wiphy,
978 enum nl80211_reg_initiator initiator,
979 struct ieee80211_channel *chan)
981 u32 flags, bw_flags = 0;
982 const struct ieee80211_reg_rule *reg_rule = NULL;
983 const struct ieee80211_power_rule *power_rule = NULL;
984 const struct ieee80211_freq_range *freq_range = NULL;
985 struct wiphy *request_wiphy = NULL;
986 struct regulatory_request *lr = get_last_request();
987 const struct ieee80211_regdomain *regd;
988 u32 max_bandwidth_khz;
990 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
992 flags = chan->orig_flags;
994 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
995 if (IS_ERR(reg_rule)) {
997 * We will disable all channels that do not match our
998 * received regulatory rule unless the hint is coming
999 * from a Country IE and the Country IE had no information
1000 * about a band. The IEEE 802.11 spec allows for an AP
1001 * to send only a subset of the regulatory rules allowed,
1002 * so an AP in the US that only supports 2.4 GHz may only send
1003 * a country IE with information for the 2.4 GHz band
1004 * while 5 GHz is still supported.
1006 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1007 PTR_ERR(reg_rule) == -ERANGE)
1010 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1011 request_wiphy && request_wiphy == wiphy &&
1012 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1013 REG_DBG_PRINT("Disabling freq %d MHz for good\n",
1015 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1016 chan->flags = chan->orig_flags;
1018 REG_DBG_PRINT("Disabling freq %d MHz\n",
1020 chan->flags |= IEEE80211_CHAN_DISABLED;
1025 chan_reg_rule_print_dbg(chan, reg_rule);
1027 power_rule = ®_rule->power_rule;
1028 freq_range = ®_rule->freq_range;
1030 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1031 /* Check if auto calculation requested */
1032 if (!max_bandwidth_khz) {
1033 regd = reg_get_regdomain(wiphy);
1034 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1037 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1038 bw_flags = IEEE80211_CHAN_NO_HT40;
1039 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1040 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1041 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1042 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1044 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1045 request_wiphy && request_wiphy == wiphy &&
1046 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1048 * This guarantees the driver's requested regulatory domain
1049 * will always be used as a base for further regulatory
1052 chan->flags = chan->orig_flags =
1053 map_regdom_flags(reg_rule->flags) | bw_flags;
1054 chan->max_antenna_gain = chan->orig_mag =
1055 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1056 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
1057 (int) MBM_TO_DBM(power_rule->max_eirp);
1061 chan->dfs_state = NL80211_DFS_USABLE;
1062 chan->dfs_state_entered = jiffies;
1064 chan->beacon_found = false;
1065 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1066 chan->max_antenna_gain =
1067 min_t(int, chan->orig_mag,
1068 MBI_TO_DBI(power_rule->max_antenna_gain));
1069 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1070 if (chan->orig_mpwr) {
1072 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1073 * will always follow the passed country IE power settings.
1075 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1076 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
1077 chan->max_power = chan->max_reg_power;
1079 chan->max_power = min(chan->orig_mpwr,
1080 chan->max_reg_power);
1082 chan->max_power = chan->max_reg_power;
1085 static void handle_band(struct wiphy *wiphy,
1086 enum nl80211_reg_initiator initiator,
1087 struct ieee80211_supported_band *sband)
1094 for (i = 0; i < sband->n_channels; i++)
1095 handle_channel(wiphy, initiator, &sband->channels[i]);
1098 static bool reg_request_cell_base(struct regulatory_request *request)
1100 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1102 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1105 bool reg_last_request_cell_base(void)
1107 return reg_request_cell_base(get_last_request());
1110 #ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
1111 /* Core specific check */
1112 static enum reg_request_treatment
1113 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1115 struct regulatory_request *lr = get_last_request();
1117 if (!reg_num_devs_support_basehint)
1118 return REG_REQ_IGNORE;
1120 if (reg_request_cell_base(lr) &&
1121 !regdom_changes(pending_request->alpha2))
1122 return REG_REQ_ALREADY_SET;
1127 /* Device specific check */
1128 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1130 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1133 static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
1135 return REG_REQ_IGNORE;
1138 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1144 static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1146 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1147 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1152 static bool ignore_reg_update(struct wiphy *wiphy,
1153 enum nl80211_reg_initiator initiator)
1155 struct regulatory_request *lr = get_last_request();
1158 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1159 "since last_request is not set\n",
1160 reg_initiator_name(initiator));
1164 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1165 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1166 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1167 "since the driver uses its own custom "
1168 "regulatory domain\n",
1169 reg_initiator_name(initiator));
1174 * wiphy->regd will be set once the device has its own
1175 * desired regulatory domain set
1177 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1178 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1179 !is_world_regdom(lr->alpha2)) {
1180 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1181 "since the driver requires its own regulatory "
1182 "domain to be set first\n",
1183 reg_initiator_name(initiator));
1187 if (reg_request_cell_base(lr))
1188 return reg_dev_ignore_cell_hint(wiphy);
1193 static bool reg_is_world_roaming(struct wiphy *wiphy)
1195 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1196 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1197 struct regulatory_request *lr = get_last_request();
1199 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1202 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1203 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1209 static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1210 struct reg_beacon *reg_beacon)
1212 struct ieee80211_supported_band *sband;
1213 struct ieee80211_channel *chan;
1214 bool channel_changed = false;
1215 struct ieee80211_channel chan_before;
1217 sband = wiphy->bands[reg_beacon->chan.band];
1218 chan = &sband->channels[chan_idx];
1220 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1223 if (chan->beacon_found)
1226 chan->beacon_found = true;
1228 if (!reg_is_world_roaming(wiphy))
1231 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1234 chan_before.center_freq = chan->center_freq;
1235 chan_before.flags = chan->flags;
1237 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1238 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1239 channel_changed = true;
1242 if (channel_changed)
1243 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1247 * Called when a scan on a wiphy finds a beacon on
1250 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1251 struct reg_beacon *reg_beacon)
1254 struct ieee80211_supported_band *sband;
1256 if (!wiphy->bands[reg_beacon->chan.band])
1259 sband = wiphy->bands[reg_beacon->chan.band];
1261 for (i = 0; i < sband->n_channels; i++)
1262 handle_reg_beacon(wiphy, i, reg_beacon);
1266 * Called upon reg changes or a new wiphy is added
1268 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1271 struct ieee80211_supported_band *sband;
1272 struct reg_beacon *reg_beacon;
1274 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1275 if (!wiphy->bands[reg_beacon->chan.band])
1277 sband = wiphy->bands[reg_beacon->chan.band];
1278 for (i = 0; i < sband->n_channels; i++)
1279 handle_reg_beacon(wiphy, i, reg_beacon);
1283 /* Reap the advantages of previously found beacons */
1284 static void reg_process_beacons(struct wiphy *wiphy)
1287 * Means we are just firing up cfg80211, so no beacons would
1288 * have been processed yet.
1292 wiphy_update_beacon_reg(wiphy);
1295 static bool is_ht40_allowed(struct ieee80211_channel *chan)
1299 if (chan->flags & IEEE80211_CHAN_DISABLED)
1301 /* This would happen when regulatory rules disallow HT40 completely */
1302 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
1307 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1308 struct ieee80211_channel *channel)
1310 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
1311 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1314 if (!is_ht40_allowed(channel)) {
1315 channel->flags |= IEEE80211_CHAN_NO_HT40;
1320 * We need to ensure the extension channels exist to
1321 * be able to use HT40- or HT40+, this finds them (or not)
1323 for (i = 0; i < sband->n_channels; i++) {
1324 struct ieee80211_channel *c = &sband->channels[i];
1326 if (c->center_freq == (channel->center_freq - 20))
1328 if (c->center_freq == (channel->center_freq + 20))
1333 * Please note that this assumes target bandwidth is 20 MHz,
1334 * if that ever changes we also need to change the below logic
1335 * to include that as well.
1337 if (!is_ht40_allowed(channel_before))
1338 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1340 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1342 if (!is_ht40_allowed(channel_after))
1343 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1345 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1348 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1349 struct ieee80211_supported_band *sband)
1356 for (i = 0; i < sband->n_channels; i++)
1357 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
1360 static void reg_process_ht_flags(struct wiphy *wiphy)
1362 enum ieee80211_band band;
1367 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1368 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
1371 static void reg_call_notifier(struct wiphy *wiphy,
1372 struct regulatory_request *request)
1374 if (wiphy->reg_notifier)
1375 wiphy->reg_notifier(wiphy, request);
1378 static void wiphy_update_regulatory(struct wiphy *wiphy,
1379 enum nl80211_reg_initiator initiator)
1381 enum ieee80211_band band;
1382 struct regulatory_request *lr = get_last_request();
1384 if (ignore_reg_update(wiphy, initiator)) {
1386 * Regulatory updates set by CORE are ignored for custom
1387 * regulatory cards. Let us notify the changes to the driver,
1388 * as some drivers used this to restore its orig_* reg domain.
1390 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1391 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1392 reg_call_notifier(wiphy, lr);
1396 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
1398 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1399 handle_band(wiphy, initiator, wiphy->bands[band]);
1401 reg_process_beacons(wiphy);
1402 reg_process_ht_flags(wiphy);
1403 reg_call_notifier(wiphy, lr);
1406 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1408 struct cfg80211_registered_device *rdev;
1409 struct wiphy *wiphy;
1413 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1414 wiphy = &rdev->wiphy;
1415 wiphy_update_regulatory(wiphy, initiator);
1419 static void handle_channel_custom(struct wiphy *wiphy,
1420 struct ieee80211_channel *chan,
1421 const struct ieee80211_regdomain *regd)
1424 const struct ieee80211_reg_rule *reg_rule = NULL;
1425 const struct ieee80211_power_rule *power_rule = NULL;
1426 const struct ieee80211_freq_range *freq_range = NULL;
1427 u32 max_bandwidth_khz;
1429 reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1432 if (IS_ERR(reg_rule)) {
1433 REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1435 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1436 chan->flags = chan->orig_flags;
1440 chan_reg_rule_print_dbg(chan, reg_rule);
1442 power_rule = ®_rule->power_rule;
1443 freq_range = ®_rule->freq_range;
1445 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1446 /* Check if auto calculation requested */
1447 if (!max_bandwidth_khz)
1448 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1450 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1451 bw_flags = IEEE80211_CHAN_NO_HT40;
1452 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1453 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1454 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1455 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1457 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1458 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1459 chan->max_reg_power = chan->max_power =
1460 (int) MBM_TO_DBM(power_rule->max_eirp);
1463 static void handle_band_custom(struct wiphy *wiphy,
1464 struct ieee80211_supported_band *sband,
1465 const struct ieee80211_regdomain *regd)
1472 for (i = 0; i < sband->n_channels; i++)
1473 handle_channel_custom(wiphy, &sband->channels[i], regd);
1476 /* Used by drivers prior to wiphy registration */
1477 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1478 const struct ieee80211_regdomain *regd)
1480 enum ieee80211_band band;
1481 unsigned int bands_set = 0;
1483 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
1484 "wiphy should have REGULATORY_CUSTOM_REG\n");
1485 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
1487 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1488 if (!wiphy->bands[band])
1490 handle_band_custom(wiphy, wiphy->bands[band], regd);
1495 * no point in calling this if it won't have any effect
1496 * on your device's supported bands.
1498 WARN_ON(!bands_set);
1500 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1502 static void reg_set_request_processed(void)
1504 bool need_more_processing = false;
1505 struct regulatory_request *lr = get_last_request();
1507 lr->processed = true;
1509 spin_lock(®_requests_lock);
1510 if (!list_empty(®_requests_list))
1511 need_more_processing = true;
1512 spin_unlock(®_requests_lock);
1514 if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
1515 cancel_delayed_work(®_timeout);
1517 if (need_more_processing)
1518 schedule_work(®_work);
1522 * reg_process_hint_core - process core regulatory requests
1523 * @pending_request: a pending core regulatory request
1525 * The wireless subsystem can use this function to process
1526 * a regulatory request issued by the regulatory core.
1528 * Returns one of the different reg request treatment values.
1530 static enum reg_request_treatment
1531 reg_process_hint_core(struct regulatory_request *core_request)
1534 core_request->intersect = false;
1535 core_request->processed = false;
1537 reg_update_last_request(core_request);
1539 return reg_call_crda(core_request);
1542 static enum reg_request_treatment
1543 __reg_process_hint_user(struct regulatory_request *user_request)
1545 struct regulatory_request *lr = get_last_request();
1547 if (reg_request_cell_base(user_request))
1548 return reg_ignore_cell_hint(user_request);
1550 if (reg_request_cell_base(lr))
1551 return REG_REQ_IGNORE;
1553 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1554 return REG_REQ_INTERSECT;
1556 * If the user knows better the user should set the regdom
1557 * to their country before the IE is picked up
1559 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
1561 return REG_REQ_IGNORE;
1563 * Process user requests only after previous user/driver/core
1564 * requests have been processed
1566 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
1567 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1568 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
1569 regdom_changes(lr->alpha2))
1570 return REG_REQ_IGNORE;
1572 if (!regdom_changes(user_request->alpha2))
1573 return REG_REQ_ALREADY_SET;
1579 * reg_process_hint_user - process user regulatory requests
1580 * @user_request: a pending user regulatory request
1582 * The wireless subsystem can use this function to process
1583 * a regulatory request initiated by userspace.
1585 * Returns one of the different reg request treatment values.
1587 static enum reg_request_treatment
1588 reg_process_hint_user(struct regulatory_request *user_request)
1590 enum reg_request_treatment treatment;
1592 treatment = __reg_process_hint_user(user_request);
1593 if (treatment == REG_REQ_IGNORE ||
1594 treatment == REG_REQ_ALREADY_SET) {
1595 kfree(user_request);
1599 user_request->intersect = treatment == REG_REQ_INTERSECT;
1600 user_request->processed = false;
1602 reg_update_last_request(user_request);
1604 user_alpha2[0] = user_request->alpha2[0];
1605 user_alpha2[1] = user_request->alpha2[1];
1607 return reg_call_crda(user_request);
1610 static enum reg_request_treatment
1611 __reg_process_hint_driver(struct regulatory_request *driver_request)
1613 struct regulatory_request *lr = get_last_request();
1615 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
1616 if (regdom_changes(driver_request->alpha2))
1618 return REG_REQ_ALREADY_SET;
1622 * This would happen if you unplug and plug your card
1623 * back in or if you add a new device for which the previously
1624 * loaded card also agrees on the regulatory domain.
1626 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1627 !regdom_changes(driver_request->alpha2))
1628 return REG_REQ_ALREADY_SET;
1630 return REG_REQ_INTERSECT;
1634 * reg_process_hint_driver - process driver regulatory requests
1635 * @driver_request: a pending driver regulatory request
1637 * The wireless subsystem can use this function to process
1638 * a regulatory request issued by an 802.11 driver.
1640 * Returns one of the different reg request treatment values.
1642 static enum reg_request_treatment
1643 reg_process_hint_driver(struct wiphy *wiphy,
1644 struct regulatory_request *driver_request)
1646 const struct ieee80211_regdomain *regd;
1647 enum reg_request_treatment treatment;
1649 treatment = __reg_process_hint_driver(driver_request);
1651 switch (treatment) {
1654 case REG_REQ_IGNORE:
1655 kfree(driver_request);
1657 case REG_REQ_INTERSECT:
1659 case REG_REQ_ALREADY_SET:
1660 regd = reg_copy_regd(get_cfg80211_regdom());
1662 kfree(driver_request);
1663 return REG_REQ_IGNORE;
1665 rcu_assign_pointer(wiphy->regd, regd);
1669 driver_request->intersect = treatment == REG_REQ_INTERSECT;
1670 driver_request->processed = false;
1672 reg_update_last_request(driver_request);
1675 * Since CRDA will not be called in this case as we already
1676 * have applied the requested regulatory domain before we just
1677 * inform userspace we have processed the request
1679 if (treatment == REG_REQ_ALREADY_SET) {
1680 nl80211_send_reg_change_event(driver_request);
1681 reg_set_request_processed();
1685 return reg_call_crda(driver_request);
1688 static enum reg_request_treatment
1689 __reg_process_hint_country_ie(struct wiphy *wiphy,
1690 struct regulatory_request *country_ie_request)
1692 struct wiphy *last_wiphy = NULL;
1693 struct regulatory_request *lr = get_last_request();
1695 if (reg_request_cell_base(lr)) {
1696 /* Trust a Cell base station over the AP's country IE */
1697 if (regdom_changes(country_ie_request->alpha2))
1698 return REG_REQ_IGNORE;
1699 return REG_REQ_ALREADY_SET;
1701 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
1702 return REG_REQ_IGNORE;
1705 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
1708 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
1711 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1713 if (last_wiphy != wiphy) {
1715 * Two cards with two APs claiming different
1716 * Country IE alpha2s. We could
1717 * intersect them, but that seems unlikely
1718 * to be correct. Reject second one for now.
1720 if (regdom_changes(country_ie_request->alpha2))
1721 return REG_REQ_IGNORE;
1722 return REG_REQ_ALREADY_SET;
1725 * Two consecutive Country IE hints on the same wiphy.
1726 * This should be picked up early by the driver/stack
1728 if (WARN_ON(regdom_changes(country_ie_request->alpha2)))
1730 return REG_REQ_ALREADY_SET;
1734 * reg_process_hint_country_ie - process regulatory requests from country IEs
1735 * @country_ie_request: a regulatory request from a country IE
1737 * The wireless subsystem can use this function to process
1738 * a regulatory request issued by a country Information Element.
1740 * Returns one of the different reg request treatment values.
1742 static enum reg_request_treatment
1743 reg_process_hint_country_ie(struct wiphy *wiphy,
1744 struct regulatory_request *country_ie_request)
1746 enum reg_request_treatment treatment;
1748 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
1750 switch (treatment) {
1753 case REG_REQ_IGNORE:
1755 case REG_REQ_ALREADY_SET:
1756 kfree(country_ie_request);
1758 case REG_REQ_INTERSECT:
1759 kfree(country_ie_request);
1761 * This doesn't happen yet, not sure we
1762 * ever want to support it for this case.
1764 WARN_ONCE(1, "Unexpected intersection for country IEs");
1765 return REG_REQ_IGNORE;
1768 country_ie_request->intersect = false;
1769 country_ie_request->processed = false;
1771 reg_update_last_request(country_ie_request);
1773 return reg_call_crda(country_ie_request);
1776 /* This processes *all* regulatory hints */
1777 static void reg_process_hint(struct regulatory_request *reg_request)
1779 struct wiphy *wiphy = NULL;
1780 enum reg_request_treatment treatment;
1782 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
1783 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1785 switch (reg_request->initiator) {
1786 case NL80211_REGDOM_SET_BY_CORE:
1787 reg_process_hint_core(reg_request);
1789 case NL80211_REGDOM_SET_BY_USER:
1790 treatment = reg_process_hint_user(reg_request);
1791 if (treatment == REG_REQ_OK ||
1792 treatment == REG_REQ_ALREADY_SET)
1794 queue_delayed_work(system_power_efficient_wq,
1795 ®_timeout, msecs_to_jiffies(3142));
1797 case NL80211_REGDOM_SET_BY_DRIVER:
1800 treatment = reg_process_hint_driver(wiphy, reg_request);
1802 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1805 treatment = reg_process_hint_country_ie(wiphy, reg_request);
1808 WARN(1, "invalid initiator %d\n", reg_request->initiator);
1812 /* This is required so that the orig_* parameters are saved */
1813 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
1814 wiphy->regulatory_flags & REGULATORY_STRICT_REG)
1815 wiphy_update_regulatory(wiphy, reg_request->initiator);
1824 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1825 * Regulatory hints come on a first come first serve basis and we
1826 * must process each one atomically.
1828 static void reg_process_pending_hints(void)
1830 struct regulatory_request *reg_request, *lr;
1832 lr = get_last_request();
1834 /* When last_request->processed becomes true this will be rescheduled */
1835 if (lr && !lr->processed) {
1836 REG_DBG_PRINT("Pending regulatory request, waiting for it to be processed...\n");
1840 spin_lock(®_requests_lock);
1842 if (list_empty(®_requests_list)) {
1843 spin_unlock(®_requests_lock);
1847 reg_request = list_first_entry(®_requests_list,
1848 struct regulatory_request,
1850 list_del_init(®_request->list);
1852 spin_unlock(®_requests_lock);
1854 reg_process_hint(reg_request);
1857 /* Processes beacon hints -- this has nothing to do with country IEs */
1858 static void reg_process_pending_beacon_hints(void)
1860 struct cfg80211_registered_device *rdev;
1861 struct reg_beacon *pending_beacon, *tmp;
1863 /* This goes through the _pending_ beacon list */
1864 spin_lock_bh(®_pending_beacons_lock);
1866 list_for_each_entry_safe(pending_beacon, tmp,
1867 ®_pending_beacons, list) {
1868 list_del_init(&pending_beacon->list);
1870 /* Applies the beacon hint to current wiphys */
1871 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1872 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1874 /* Remembers the beacon hint for new wiphys or reg changes */
1875 list_add_tail(&pending_beacon->list, ®_beacon_list);
1878 spin_unlock_bh(®_pending_beacons_lock);
1881 static void reg_todo(struct work_struct *work)
1884 reg_process_pending_hints();
1885 reg_process_pending_beacon_hints();
1889 static void queue_regulatory_request(struct regulatory_request *request)
1891 request->alpha2[0] = toupper(request->alpha2[0]);
1892 request->alpha2[1] = toupper(request->alpha2[1]);
1894 spin_lock(®_requests_lock);
1895 list_add_tail(&request->list, ®_requests_list);
1896 spin_unlock(®_requests_lock);
1898 schedule_work(®_work);
1902 * Core regulatory hint -- happens during cfg80211_init()
1903 * and when we restore regulatory settings.
1905 static int regulatory_hint_core(const char *alpha2)
1907 struct regulatory_request *request;
1909 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1913 request->alpha2[0] = alpha2[0];
1914 request->alpha2[1] = alpha2[1];
1915 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1917 queue_regulatory_request(request);
1923 int regulatory_hint_user(const char *alpha2,
1924 enum nl80211_user_reg_hint_type user_reg_hint_type)
1926 struct regulatory_request *request;
1928 if (WARN_ON(!alpha2))
1931 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1935 request->wiphy_idx = WIPHY_IDX_INVALID;
1936 request->alpha2[0] = alpha2[0];
1937 request->alpha2[1] = alpha2[1];
1938 request->initiator = NL80211_REGDOM_SET_BY_USER;
1939 request->user_reg_hint_type = user_reg_hint_type;
1941 queue_regulatory_request(request);
1947 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1949 struct regulatory_request *request;
1951 if (WARN_ON(!alpha2 || !wiphy))
1954 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
1956 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1960 request->wiphy_idx = get_wiphy_idx(wiphy);
1962 request->alpha2[0] = alpha2[0];
1963 request->alpha2[1] = alpha2[1];
1964 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1966 queue_regulatory_request(request);
1970 EXPORT_SYMBOL(regulatory_hint);
1972 void regulatory_hint_country_ie(struct wiphy *wiphy, enum ieee80211_band band,
1973 const u8 *country_ie, u8 country_ie_len)
1976 enum environment_cap env = ENVIRON_ANY;
1977 struct regulatory_request *request = NULL, *lr;
1979 /* IE len must be evenly divisible by 2 */
1980 if (country_ie_len & 0x01)
1983 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1986 request = kzalloc(sizeof(*request), GFP_KERNEL);
1990 alpha2[0] = country_ie[0];
1991 alpha2[1] = country_ie[1];
1993 if (country_ie[2] == 'I')
1994 env = ENVIRON_INDOOR;
1995 else if (country_ie[2] == 'O')
1996 env = ENVIRON_OUTDOOR;
1999 lr = get_last_request();
2005 * We will run this only upon a successful connection on cfg80211.
2006 * We leave conflict resolution to the workqueue, where can hold
2009 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
2010 lr->wiphy_idx != WIPHY_IDX_INVALID)
2013 request->wiphy_idx = get_wiphy_idx(wiphy);
2014 request->alpha2[0] = alpha2[0];
2015 request->alpha2[1] = alpha2[1];
2016 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
2017 request->country_ie_env = env;
2019 queue_regulatory_request(request);
2026 static void restore_alpha2(char *alpha2, bool reset_user)
2028 /* indicates there is no alpha2 to consider for restoration */
2032 /* The user setting has precedence over the module parameter */
2033 if (is_user_regdom_saved()) {
2034 /* Unless we're asked to ignore it and reset it */
2036 REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
2037 user_alpha2[0] = '9';
2038 user_alpha2[1] = '7';
2041 * If we're ignoring user settings, we still need to
2042 * check the module parameter to ensure we put things
2043 * back as they were for a full restore.
2045 if (!is_world_regdom(ieee80211_regdom)) {
2046 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2047 ieee80211_regdom[0], ieee80211_regdom[1]);
2048 alpha2[0] = ieee80211_regdom[0];
2049 alpha2[1] = ieee80211_regdom[1];
2052 REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
2053 user_alpha2[0], user_alpha2[1]);
2054 alpha2[0] = user_alpha2[0];
2055 alpha2[1] = user_alpha2[1];
2057 } else if (!is_world_regdom(ieee80211_regdom)) {
2058 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2059 ieee80211_regdom[0], ieee80211_regdom[1]);
2060 alpha2[0] = ieee80211_regdom[0];
2061 alpha2[1] = ieee80211_regdom[1];
2063 REG_DBG_PRINT("Restoring regulatory settings\n");
2066 static void restore_custom_reg_settings(struct wiphy *wiphy)
2068 struct ieee80211_supported_band *sband;
2069 enum ieee80211_band band;
2070 struct ieee80211_channel *chan;
2073 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
2074 sband = wiphy->bands[band];
2077 for (i = 0; i < sband->n_channels; i++) {
2078 chan = &sband->channels[i];
2079 chan->flags = chan->orig_flags;
2080 chan->max_antenna_gain = chan->orig_mag;
2081 chan->max_power = chan->orig_mpwr;
2082 chan->beacon_found = false;
2088 * Restoring regulatory settings involves ingoring any
2089 * possibly stale country IE information and user regulatory
2090 * settings if so desired, this includes any beacon hints
2091 * learned as we could have traveled outside to another country
2092 * after disconnection. To restore regulatory settings we do
2093 * exactly what we did at bootup:
2095 * - send a core regulatory hint
2096 * - send a user regulatory hint if applicable
2098 * Device drivers that send a regulatory hint for a specific country
2099 * keep their own regulatory domain on wiphy->regd so that does does
2100 * not need to be remembered.
2102 static void restore_regulatory_settings(bool reset_user)
2105 char world_alpha2[2];
2106 struct reg_beacon *reg_beacon, *btmp;
2107 struct regulatory_request *reg_request, *tmp;
2108 LIST_HEAD(tmp_reg_req_list);
2109 struct cfg80211_registered_device *rdev;
2113 reset_regdomains(true, &world_regdom);
2114 restore_alpha2(alpha2, reset_user);
2117 * If there's any pending requests we simply
2118 * stash them to a temporary pending queue and
2119 * add then after we've restored regulatory
2122 spin_lock(®_requests_lock);
2123 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
2124 if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER)
2126 list_move_tail(®_request->list, &tmp_reg_req_list);
2128 spin_unlock(®_requests_lock);
2130 /* Clear beacon hints */
2131 spin_lock_bh(®_pending_beacons_lock);
2132 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2133 list_del(®_beacon->list);
2136 spin_unlock_bh(®_pending_beacons_lock);
2138 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2139 list_del(®_beacon->list);
2143 /* First restore to the basic regulatory settings */
2144 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
2145 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
2147 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2148 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
2149 restore_custom_reg_settings(&rdev->wiphy);
2152 regulatory_hint_core(world_alpha2);
2155 * This restores the ieee80211_regdom module parameter
2156 * preference or the last user requested regulatory
2157 * settings, user regulatory settings takes precedence.
2159 if (is_an_alpha2(alpha2))
2160 regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
2162 spin_lock(®_requests_lock);
2163 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
2164 spin_unlock(®_requests_lock);
2166 REG_DBG_PRINT("Kicking the queue\n");
2168 schedule_work(®_work);
2171 void regulatory_hint_disconnect(void)
2173 REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
2174 restore_regulatory_settings(false);
2177 static bool freq_is_chan_12_13_14(u16 freq)
2179 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
2180 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
2181 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
2186 static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
2188 struct reg_beacon *pending_beacon;
2190 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
2191 if (beacon_chan->center_freq ==
2192 pending_beacon->chan.center_freq)
2197 int regulatory_hint_found_beacon(struct wiphy *wiphy,
2198 struct ieee80211_channel *beacon_chan,
2201 struct reg_beacon *reg_beacon;
2204 if (beacon_chan->beacon_found ||
2205 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
2206 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
2207 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
2210 spin_lock_bh(®_pending_beacons_lock);
2211 processing = pending_reg_beacon(beacon_chan);
2212 spin_unlock_bh(®_pending_beacons_lock);
2217 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
2221 REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
2222 beacon_chan->center_freq,
2223 ieee80211_frequency_to_channel(beacon_chan->center_freq),
2226 memcpy(®_beacon->chan, beacon_chan,
2227 sizeof(struct ieee80211_channel));
2230 * Since we can be called from BH or and non-BH context
2231 * we must use spin_lock_bh()
2233 spin_lock_bh(®_pending_beacons_lock);
2234 list_add_tail(®_beacon->list, ®_pending_beacons);
2235 spin_unlock_bh(®_pending_beacons_lock);
2237 schedule_work(®_work);
2242 static void print_rd_rules(const struct ieee80211_regdomain *rd)
2245 const struct ieee80211_reg_rule *reg_rule = NULL;
2246 const struct ieee80211_freq_range *freq_range = NULL;
2247 const struct ieee80211_power_rule *power_rule = NULL;
2250 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
2252 for (i = 0; i < rd->n_reg_rules; i++) {
2253 reg_rule = &rd->reg_rules[i];
2254 freq_range = ®_rule->freq_range;
2255 power_rule = ®_rule->power_rule;
2257 if (!freq_range->max_bandwidth_khz)
2258 snprintf(bw, 32, "%d KHz, AUTO",
2259 reg_get_max_bandwidth(rd, reg_rule));
2261 snprintf(bw, 32, "%d KHz",
2262 freq_range->max_bandwidth_khz);
2265 * There may not be documentation for max antenna gain
2266 * in certain regions
2268 if (power_rule->max_antenna_gain)
2269 pr_info(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm)\n",
2270 freq_range->start_freq_khz,
2271 freq_range->end_freq_khz,
2273 power_rule->max_antenna_gain,
2274 power_rule->max_eirp);
2276 pr_info(" (%d KHz - %d KHz @ %s), (N/A, %d mBm)\n",
2277 freq_range->start_freq_khz,
2278 freq_range->end_freq_khz,
2280 power_rule->max_eirp);
2284 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
2286 switch (dfs_region) {
2287 case NL80211_DFS_UNSET:
2288 case NL80211_DFS_FCC:
2289 case NL80211_DFS_ETSI:
2290 case NL80211_DFS_JP:
2293 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2299 static void print_regdomain(const struct ieee80211_regdomain *rd)
2301 struct regulatory_request *lr = get_last_request();
2303 if (is_intersected_alpha2(rd->alpha2)) {
2304 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2305 struct cfg80211_registered_device *rdev;
2306 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
2308 pr_info("Current regulatory domain updated by AP to: %c%c\n",
2309 rdev->country_ie_alpha2[0],
2310 rdev->country_ie_alpha2[1]);
2312 pr_info("Current regulatory domain intersected:\n");
2314 pr_info("Current regulatory domain intersected:\n");
2315 } else if (is_world_regdom(rd->alpha2)) {
2316 pr_info("World regulatory domain updated:\n");
2318 if (is_unknown_alpha2(rd->alpha2))
2319 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
2321 if (reg_request_cell_base(lr))
2322 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
2323 rd->alpha2[0], rd->alpha2[1]);
2325 pr_info("Regulatory domain changed to country: %c%c\n",
2326 rd->alpha2[0], rd->alpha2[1]);
2330 pr_info(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
2334 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2336 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
2340 static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
2342 if (!is_world_regdom(rd->alpha2))
2344 update_world_regdomain(rd);
2348 static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
2349 struct regulatory_request *user_request)
2351 const struct ieee80211_regdomain *intersected_rd = NULL;
2353 if (is_world_regdom(rd->alpha2))
2356 if (!regdom_changes(rd->alpha2))
2359 if (!is_valid_rd(rd)) {
2360 pr_err("Invalid regulatory domain detected:\n");
2361 print_regdomain_info(rd);
2365 if (!user_request->intersect) {
2366 reset_regdomains(false, rd);
2370 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2371 if (!intersected_rd)
2376 reset_regdomains(false, intersected_rd);
2381 static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
2382 struct regulatory_request *driver_request)
2384 const struct ieee80211_regdomain *regd;
2385 const struct ieee80211_regdomain *intersected_rd = NULL;
2386 const struct ieee80211_regdomain *tmp;
2387 struct wiphy *request_wiphy;
2389 if (is_world_regdom(rd->alpha2))
2392 if (!regdom_changes(rd->alpha2))
2395 if (!is_valid_rd(rd)) {
2396 pr_err("Invalid regulatory domain detected:\n");
2397 print_regdomain_info(rd);
2401 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
2402 if (!request_wiphy) {
2403 queue_delayed_work(system_power_efficient_wq,
2408 if (!driver_request->intersect) {
2409 if (request_wiphy->regd)
2412 regd = reg_copy_regd(rd);
2414 return PTR_ERR(regd);
2416 rcu_assign_pointer(request_wiphy->regd, regd);
2417 reset_regdomains(false, rd);
2421 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2422 if (!intersected_rd)
2426 * We can trash what CRDA provided now.
2427 * However if a driver requested this specific regulatory
2428 * domain we keep it for its private use
2430 tmp = get_wiphy_regdom(request_wiphy);
2431 rcu_assign_pointer(request_wiphy->regd, rd);
2432 rcu_free_regdom(tmp);
2436 reset_regdomains(false, intersected_rd);
2441 static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
2442 struct regulatory_request *country_ie_request)
2444 struct wiphy *request_wiphy;
2446 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2447 !is_unknown_alpha2(rd->alpha2))
2451 * Lets only bother proceeding on the same alpha2 if the current
2452 * rd is non static (it means CRDA was present and was used last)
2453 * and the pending request came in from a country IE
2456 if (!is_valid_rd(rd)) {
2457 pr_err("Invalid regulatory domain detected:\n");
2458 print_regdomain_info(rd);
2462 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
2463 if (!request_wiphy) {
2464 queue_delayed_work(system_power_efficient_wq,
2469 if (country_ie_request->intersect)
2472 reset_regdomains(false, rd);
2477 * Use this call to set the current regulatory domain. Conflicts with
2478 * multiple drivers can be ironed out later. Caller must've already
2479 * kmalloc'd the rd structure.
2481 int set_regdom(const struct ieee80211_regdomain *rd)
2483 struct regulatory_request *lr;
2486 if (!reg_is_valid_request(rd->alpha2)) {
2491 lr = get_last_request();
2493 /* Note that this doesn't update the wiphys, this is done below */
2494 switch (lr->initiator) {
2495 case NL80211_REGDOM_SET_BY_CORE:
2496 r = reg_set_rd_core(rd);
2498 case NL80211_REGDOM_SET_BY_USER:
2499 r = reg_set_rd_user(rd, lr);
2501 case NL80211_REGDOM_SET_BY_DRIVER:
2502 r = reg_set_rd_driver(rd, lr);
2504 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2505 r = reg_set_rd_country_ie(rd, lr);
2508 WARN(1, "invalid initiator %d\n", lr->initiator);
2514 reg_set_request_processed();
2520 /* This would make this whole thing pointless */
2521 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
2524 /* update all wiphys now with the new established regulatory domain */
2525 update_all_wiphy_regulatory(lr->initiator);
2527 print_regdomain(get_cfg80211_regdom());
2529 nl80211_send_reg_change_event(lr);
2531 reg_set_request_processed();
2536 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2538 struct regulatory_request *lr;
2543 lr = get_last_request();
2544 if (lr && !lr->processed) {
2545 memcpy(alpha2, lr->alpha2, 2);
2551 return add_uevent_var(env, "COUNTRY=%c%c",
2552 alpha2[0], alpha2[1]);
2556 void wiphy_regulatory_register(struct wiphy *wiphy)
2558 struct regulatory_request *lr;
2560 if (!reg_dev_ignore_cell_hint(wiphy))
2561 reg_num_devs_support_basehint++;
2563 lr = get_last_request();
2564 wiphy_update_regulatory(wiphy, lr->initiator);
2567 void wiphy_regulatory_deregister(struct wiphy *wiphy)
2569 struct wiphy *request_wiphy = NULL;
2570 struct regulatory_request *lr;
2572 lr = get_last_request();
2574 if (!reg_dev_ignore_cell_hint(wiphy))
2575 reg_num_devs_support_basehint--;
2577 rcu_free_regdom(get_wiphy_regdom(wiphy));
2578 rcu_assign_pointer(wiphy->regd, NULL);
2581 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2583 if (!request_wiphy || request_wiphy != wiphy)
2586 lr->wiphy_idx = WIPHY_IDX_INVALID;
2587 lr->country_ie_env = ENVIRON_ANY;
2590 static void reg_timeout_work(struct work_struct *work)
2592 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
2594 restore_regulatory_settings(true);
2598 int __init regulatory_init(void)
2602 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2603 if (IS_ERR(reg_pdev))
2604 return PTR_ERR(reg_pdev);
2606 reg_pdev->dev.type = ®_device_type;
2608 spin_lock_init(®_requests_lock);
2609 spin_lock_init(®_pending_beacons_lock);
2611 reg_regdb_size_check();
2613 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
2615 user_alpha2[0] = '9';
2616 user_alpha2[1] = '7';
2618 /* We always try to get an update for the static regdomain */
2619 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
2624 * N.B. kobject_uevent_env() can fail mainly for when we're out
2625 * memory which is handled and propagated appropriately above
2626 * but it can also fail during a netlink_broadcast() or during
2627 * early boot for call_usermodehelper(). For now treat these
2628 * errors as non-fatal.
2630 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2634 * Finally, if the user set the module parameter treat it
2637 if (!is_world_regdom(ieee80211_regdom))
2638 regulatory_hint_user(ieee80211_regdom,
2639 NL80211_USER_REG_HINT_USER);
2644 void regulatory_exit(void)
2646 struct regulatory_request *reg_request, *tmp;
2647 struct reg_beacon *reg_beacon, *btmp;
2649 cancel_work_sync(®_work);
2650 cancel_delayed_work_sync(®_timeout);
2652 /* Lock to suppress warnings */
2654 reset_regdomains(true, NULL);
2657 dev_set_uevent_suppress(®_pdev->dev, true);
2659 platform_device_unregister(reg_pdev);
2661 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2662 list_del(®_beacon->list);
2666 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2667 list_del(®_beacon->list);
2671 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
2672 list_del(®_request->list);