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>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Permission to use, copy, modify, and/or distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 * DOC: Wireless regulatory infrastructure
25 * The usual implementation is for a driver to read a device EEPROM to
26 * determine which regulatory domain it should be operating under, then
27 * looking up the allowable channels in a driver-local table and finally
28 * registering those channels in the wiphy structure.
30 * Another set of compliance enforcement is for drivers to use their
31 * own compliance limits which can be stored on the EEPROM. The host
32 * driver or firmware may ensure these are used.
34 * In addition to all this we provide an extra layer of regulatory
35 * conformance. For drivers which do not have any regulatory
36 * information CRDA provides the complete regulatory solution.
37 * For others it provides a community effort on further restrictions
38 * to enhance compliance.
40 * Note: When number of rules --> infinity we will not be able to
41 * index on alpha2 any more, instead we'll probably have to
42 * rely on some SHA1 checksum of the regdomain for example.
46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
48 #include <linux/kernel.h>
49 #include <linux/export.h>
50 #include <linux/slab.h>
51 #include <linux/list.h>
52 #include <linux/ctype.h>
53 #include <linux/nl80211.h>
54 #include <linux/platform_device.h>
55 #include <linux/moduleparam.h>
56 #include <net/cfg80211.h>
64 * Grace period we give before making sure all current interfaces reside on
65 * channels allowed by the current regulatory domain.
67 #define REG_ENFORCE_GRACE_MS 60000
70 * enum reg_request_treatment - regulatory request treatment
72 * @REG_REQ_OK: continue processing the regulatory request
73 * @REG_REQ_IGNORE: ignore the regulatory request
74 * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should
75 * be intersected with the current one.
76 * @REG_REQ_ALREADY_SET: the regulatory request will not change the current
77 * regulatory settings, and no further processing is required.
79 enum reg_request_treatment {
86 static struct regulatory_request core_request_world = {
87 .initiator = NL80211_REGDOM_SET_BY_CORE,
92 .country_ie_env = ENVIRON_ANY,
96 * Receipt of information from last regulatory request,
97 * protected by RTNL (and can be accessed with RCU protection)
99 static struct regulatory_request __rcu *last_request =
100 (void __force __rcu *)&core_request_world;
102 /* To trigger userspace events */
103 static struct platform_device *reg_pdev;
106 * Central wireless core regulatory domains, we only need two,
107 * the current one and a world regulatory domain in case we have no
108 * information to give us an alpha2.
109 * (protected by RTNL, can be read under RCU)
111 const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
114 * Number of devices that registered to the core
115 * that support cellular base station regulatory hints
116 * (protected by RTNL)
118 static int reg_num_devs_support_basehint;
121 * State variable indicating if the platform on which the devices
122 * are attached is operating in an indoor environment. The state variable
123 * is relevant for all registered devices.
125 static bool reg_is_indoor;
126 static spinlock_t reg_indoor_lock;
128 /* Used to track the userspace process controlling the indoor setting */
129 static u32 reg_is_indoor_portid;
131 static void restore_regulatory_settings(bool reset_user);
133 static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
135 return rtnl_dereference(cfg80211_regdomain);
138 const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
140 return rtnl_dereference(wiphy->regd);
143 static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region)
145 switch (dfs_region) {
146 case NL80211_DFS_UNSET:
148 case NL80211_DFS_FCC:
150 case NL80211_DFS_ETSI:
158 enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy)
160 const struct ieee80211_regdomain *regd = NULL;
161 const struct ieee80211_regdomain *wiphy_regd = NULL;
163 regd = get_cfg80211_regdom();
167 wiphy_regd = get_wiphy_regdom(wiphy);
171 if (wiphy_regd->dfs_region == regd->dfs_region)
174 pr_debug("%s: device specific dfs_region (%s) disagrees with cfg80211's central dfs_region (%s)\n",
175 dev_name(&wiphy->dev),
176 reg_dfs_region_str(wiphy_regd->dfs_region),
177 reg_dfs_region_str(regd->dfs_region));
180 return regd->dfs_region;
183 static void rcu_free_regdom(const struct ieee80211_regdomain *r)
187 kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
190 static struct regulatory_request *get_last_request(void)
192 return rcu_dereference_rtnl(last_request);
195 /* Used to queue up regulatory hints */
196 static LIST_HEAD(reg_requests_list);
197 static spinlock_t reg_requests_lock;
199 /* Used to queue up beacon hints for review */
200 static LIST_HEAD(reg_pending_beacons);
201 static spinlock_t reg_pending_beacons_lock;
203 /* Used to keep track of processed beacon hints */
204 static LIST_HEAD(reg_beacon_list);
207 struct list_head list;
208 struct ieee80211_channel chan;
211 static void reg_check_chans_work(struct work_struct *work);
212 static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work);
214 static void reg_todo(struct work_struct *work);
215 static DECLARE_WORK(reg_work, reg_todo);
217 /* We keep a static world regulatory domain in case of the absence of CRDA */
218 static const struct ieee80211_regdomain world_regdom = {
222 /* IEEE 802.11b/g, channels 1..11 */
223 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
224 /* IEEE 802.11b/g, channels 12..13. */
225 REG_RULE(2467-10, 2472+10, 40, 6, 20,
227 /* IEEE 802.11 channel 14 - Only JP enables
228 * this and for 802.11b only */
229 REG_RULE(2484-10, 2484+10, 20, 6, 20,
231 NL80211_RRF_NO_OFDM),
232 /* IEEE 802.11a, channel 36..48 */
233 REG_RULE(5180-10, 5240+10, 160, 6, 20,
236 /* IEEE 802.11a, channel 52..64 - DFS required */
237 REG_RULE(5260-10, 5320+10, 160, 6, 20,
241 /* IEEE 802.11a, channel 100..144 - DFS required */
242 REG_RULE(5500-10, 5720+10, 160, 6, 20,
246 /* IEEE 802.11a, channel 149..165 */
247 REG_RULE(5745-10, 5825+10, 80, 6, 20,
250 /* IEEE 802.11ad (60GHz), channels 1..3 */
251 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
255 /* protected by RTNL */
256 static const struct ieee80211_regdomain *cfg80211_world_regdom =
259 static char *ieee80211_regdom = "00";
260 static char user_alpha2[2];
262 module_param(ieee80211_regdom, charp, 0444);
263 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
265 static void reg_free_request(struct regulatory_request *request)
267 if (request == &core_request_world)
270 if (request != get_last_request())
274 static void reg_free_last_request(void)
276 struct regulatory_request *lr = get_last_request();
278 if (lr != &core_request_world && lr)
279 kfree_rcu(lr, rcu_head);
282 static void reg_update_last_request(struct regulatory_request *request)
284 struct regulatory_request *lr;
286 lr = get_last_request();
290 reg_free_last_request();
291 rcu_assign_pointer(last_request, request);
294 static void reset_regdomains(bool full_reset,
295 const struct ieee80211_regdomain *new_regdom)
297 const struct ieee80211_regdomain *r;
301 r = get_cfg80211_regdom();
303 /* avoid freeing static information or freeing something twice */
304 if (r == cfg80211_world_regdom)
306 if (cfg80211_world_regdom == &world_regdom)
307 cfg80211_world_regdom = NULL;
308 if (r == &world_regdom)
312 rcu_free_regdom(cfg80211_world_regdom);
314 cfg80211_world_regdom = &world_regdom;
315 rcu_assign_pointer(cfg80211_regdomain, new_regdom);
320 reg_update_last_request(&core_request_world);
324 * Dynamic world regulatory domain requested by the wireless
325 * core upon initialization
327 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
329 struct regulatory_request *lr;
331 lr = get_last_request();
335 reset_regdomains(false, rd);
337 cfg80211_world_regdom = rd;
340 bool is_world_regdom(const char *alpha2)
344 return alpha2[0] == '0' && alpha2[1] == '0';
347 static bool is_alpha2_set(const char *alpha2)
351 return alpha2[0] && alpha2[1];
354 static bool is_unknown_alpha2(const char *alpha2)
359 * Special case where regulatory domain was built by driver
360 * but a specific alpha2 cannot be determined
362 return alpha2[0] == '9' && alpha2[1] == '9';
365 static bool is_intersected_alpha2(const char *alpha2)
370 * Special case where regulatory domain is the
371 * result of an intersection between two regulatory domain
374 return alpha2[0] == '9' && alpha2[1] == '8';
377 static bool is_an_alpha2(const char *alpha2)
381 return isalpha(alpha2[0]) && isalpha(alpha2[1]);
384 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
386 if (!alpha2_x || !alpha2_y)
388 return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
391 static bool regdom_changes(const char *alpha2)
393 const struct ieee80211_regdomain *r = get_cfg80211_regdom();
397 return !alpha2_equal(r->alpha2, alpha2);
401 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
402 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
403 * has ever been issued.
405 static bool is_user_regdom_saved(void)
407 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
410 /* This would indicate a mistake on the design */
411 if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
412 "Unexpected user alpha2: %c%c\n",
413 user_alpha2[0], user_alpha2[1]))
419 static const struct ieee80211_regdomain *
420 reg_copy_regd(const struct ieee80211_regdomain *src_regd)
422 struct ieee80211_regdomain *regd;
427 sizeof(struct ieee80211_regdomain) +
428 src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
430 regd = kzalloc(size_of_regd, GFP_KERNEL);
432 return ERR_PTR(-ENOMEM);
434 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
436 for (i = 0; i < src_regd->n_reg_rules; i++)
437 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
438 sizeof(struct ieee80211_reg_rule));
443 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
444 struct reg_regdb_apply_request {
445 struct list_head list;
446 const struct ieee80211_regdomain *regdom;
449 static LIST_HEAD(reg_regdb_apply_list);
450 static DEFINE_MUTEX(reg_regdb_apply_mutex);
452 static void reg_regdb_apply(struct work_struct *work)
454 struct reg_regdb_apply_request *request;
458 mutex_lock(®_regdb_apply_mutex);
459 while (!list_empty(®_regdb_apply_list)) {
460 request = list_first_entry(®_regdb_apply_list,
461 struct reg_regdb_apply_request,
463 list_del(&request->list);
465 set_regdom(request->regdom, REGD_SOURCE_INTERNAL_DB);
468 mutex_unlock(®_regdb_apply_mutex);
473 static DECLARE_WORK(reg_regdb_work, reg_regdb_apply);
475 static int reg_query_builtin(const char *alpha2)
477 const struct ieee80211_regdomain *regdom = NULL;
478 struct reg_regdb_apply_request *request;
481 for (i = 0; i < reg_regdb_size; i++) {
482 if (alpha2_equal(alpha2, reg_regdb[i]->alpha2)) {
483 regdom = reg_regdb[i];
491 request = kzalloc(sizeof(struct reg_regdb_apply_request), GFP_KERNEL);
495 request->regdom = reg_copy_regd(regdom);
496 if (IS_ERR_OR_NULL(request->regdom)) {
501 mutex_lock(®_regdb_apply_mutex);
502 list_add_tail(&request->list, ®_regdb_apply_list);
503 mutex_unlock(®_regdb_apply_mutex);
505 schedule_work(®_regdb_work);
510 /* Feel free to add any other sanity checks here */
511 static void reg_regdb_size_check(void)
513 /* We should ideally BUILD_BUG_ON() but then random builds would fail */
514 WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
517 static inline void reg_regdb_size_check(void) {}
518 static inline int reg_query_builtin(const char *alpha2)
522 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
524 #ifdef CONFIG_CFG80211_CRDA_SUPPORT
525 /* Max number of consecutive attempts to communicate with CRDA */
526 #define REG_MAX_CRDA_TIMEOUTS 10
528 static u32 reg_crda_timeouts;
530 static void crda_timeout_work(struct work_struct *work);
531 static DECLARE_DELAYED_WORK(crda_timeout, crda_timeout_work);
533 static void crda_timeout_work(struct work_struct *work)
535 pr_debug("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
538 restore_regulatory_settings(true);
542 static void cancel_crda_timeout(void)
544 cancel_delayed_work(&crda_timeout);
547 static void cancel_crda_timeout_sync(void)
549 cancel_delayed_work_sync(&crda_timeout);
552 static void reset_crda_timeouts(void)
554 reg_crda_timeouts = 0;
558 * This lets us keep regulatory code which is updated on a regulatory
559 * basis in userspace.
561 static int call_crda(const char *alpha2)
564 char *env[] = { country, NULL };
567 snprintf(country, sizeof(country), "COUNTRY=%c%c",
568 alpha2[0], alpha2[1]);
570 if (reg_crda_timeouts > REG_MAX_CRDA_TIMEOUTS) {
571 pr_debug("Exceeded CRDA call max attempts. Not calling CRDA\n");
575 if (!is_world_regdom((char *) alpha2))
576 pr_debug("Calling CRDA for country: %c%c\n",
577 alpha2[0], alpha2[1]);
579 pr_debug("Calling CRDA to update world regulatory domain\n");
581 ret = kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, env);
585 queue_delayed_work(system_power_efficient_wq,
586 &crda_timeout, msecs_to_jiffies(3142));
590 static inline void cancel_crda_timeout(void) {}
591 static inline void cancel_crda_timeout_sync(void) {}
592 static inline void reset_crda_timeouts(void) {}
593 static inline int call_crda(const char *alpha2)
597 #endif /* CONFIG_CFG80211_CRDA_SUPPORT */
599 static bool reg_query_database(struct regulatory_request *request)
601 /* query internal regulatory database (if it exists) */
602 if (reg_query_builtin(request->alpha2) == 0)
605 if (call_crda(request->alpha2) == 0)
611 bool reg_is_valid_request(const char *alpha2)
613 struct regulatory_request *lr = get_last_request();
615 if (!lr || lr->processed)
618 return alpha2_equal(lr->alpha2, alpha2);
621 static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
623 struct regulatory_request *lr = get_last_request();
626 * Follow the driver's regulatory domain, if present, unless a country
627 * IE has been processed or a user wants to help complaince further
629 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
630 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
632 return get_wiphy_regdom(wiphy);
634 return get_cfg80211_regdom();
638 reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd,
639 const struct ieee80211_reg_rule *rule)
641 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
642 const struct ieee80211_freq_range *freq_range_tmp;
643 const struct ieee80211_reg_rule *tmp;
644 u32 start_freq, end_freq, idx, no;
646 for (idx = 0; idx < rd->n_reg_rules; idx++)
647 if (rule == &rd->reg_rules[idx])
650 if (idx == rd->n_reg_rules)
657 tmp = &rd->reg_rules[--no];
658 freq_range_tmp = &tmp->freq_range;
660 if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
663 freq_range = freq_range_tmp;
666 start_freq = freq_range->start_freq_khz;
669 freq_range = &rule->freq_range;
672 while (no < rd->n_reg_rules - 1) {
673 tmp = &rd->reg_rules[++no];
674 freq_range_tmp = &tmp->freq_range;
676 if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
679 freq_range = freq_range_tmp;
682 end_freq = freq_range->end_freq_khz;
684 return end_freq - start_freq;
687 unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
688 const struct ieee80211_reg_rule *rule)
690 unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule);
692 if (rule->flags & NL80211_RRF_NO_160MHZ)
693 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80));
694 if (rule->flags & NL80211_RRF_NO_80MHZ)
695 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40));
698 * HT40+/HT40- limits are handled per-channel. Only limit BW if both
701 if (rule->flags & NL80211_RRF_NO_HT40MINUS &&
702 rule->flags & NL80211_RRF_NO_HT40PLUS)
703 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20));
708 /* Sanity check on a regulatory rule */
709 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
711 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
714 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
717 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
720 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
722 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
723 freq_range->max_bandwidth_khz > freq_diff)
729 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
731 const struct ieee80211_reg_rule *reg_rule = NULL;
734 if (!rd->n_reg_rules)
737 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
740 for (i = 0; i < rd->n_reg_rules; i++) {
741 reg_rule = &rd->reg_rules[i];
742 if (!is_valid_reg_rule(reg_rule))
749 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
750 u32 center_freq_khz, u32 bw_khz)
752 u32 start_freq_khz, end_freq_khz;
754 start_freq_khz = center_freq_khz - (bw_khz/2);
755 end_freq_khz = center_freq_khz + (bw_khz/2);
757 if (start_freq_khz >= freq_range->start_freq_khz &&
758 end_freq_khz <= freq_range->end_freq_khz)
765 * freq_in_rule_band - tells us if a frequency is in a frequency band
766 * @freq_range: frequency rule we want to query
767 * @freq_khz: frequency we are inquiring about
769 * This lets us know if a specific frequency rule is or is not relevant to
770 * a specific frequency's band. Bands are device specific and artificial
771 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
772 * however it is safe for now to assume that a frequency rule should not be
773 * part of a frequency's band if the start freq or end freq are off by more
774 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
776 * This resolution can be lowered and should be considered as we add
777 * regulatory rule support for other "bands".
779 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
782 #define ONE_GHZ_IN_KHZ 1000000
784 * From 802.11ad: directional multi-gigabit (DMG):
785 * Pertaining to operation in a frequency band containing a channel
786 * with the Channel starting frequency above 45 GHz.
788 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
789 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
790 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
792 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
795 #undef ONE_GHZ_IN_KHZ
799 * Later on we can perhaps use the more restrictive DFS
800 * region but we don't have information for that yet so
801 * for now simply disallow conflicts.
803 static enum nl80211_dfs_regions
804 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
805 const enum nl80211_dfs_regions dfs_region2)
807 if (dfs_region1 != dfs_region2)
808 return NL80211_DFS_UNSET;
813 * Helper for regdom_intersect(), this does the real
814 * mathematical intersection fun
816 static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
817 const struct ieee80211_regdomain *rd2,
818 const struct ieee80211_reg_rule *rule1,
819 const struct ieee80211_reg_rule *rule2,
820 struct ieee80211_reg_rule *intersected_rule)
822 const struct ieee80211_freq_range *freq_range1, *freq_range2;
823 struct ieee80211_freq_range *freq_range;
824 const struct ieee80211_power_rule *power_rule1, *power_rule2;
825 struct ieee80211_power_rule *power_rule;
826 u32 freq_diff, max_bandwidth1, max_bandwidth2;
828 freq_range1 = &rule1->freq_range;
829 freq_range2 = &rule2->freq_range;
830 freq_range = &intersected_rule->freq_range;
832 power_rule1 = &rule1->power_rule;
833 power_rule2 = &rule2->power_rule;
834 power_rule = &intersected_rule->power_rule;
836 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
837 freq_range2->start_freq_khz);
838 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
839 freq_range2->end_freq_khz);
841 max_bandwidth1 = freq_range1->max_bandwidth_khz;
842 max_bandwidth2 = freq_range2->max_bandwidth_khz;
844 if (rule1->flags & NL80211_RRF_AUTO_BW)
845 max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
846 if (rule2->flags & NL80211_RRF_AUTO_BW)
847 max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
849 freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
851 intersected_rule->flags = rule1->flags | rule2->flags;
854 * In case NL80211_RRF_AUTO_BW requested for both rules
855 * set AUTO_BW in intersected rule also. Next we will
856 * calculate BW correctly in handle_channel function.
857 * In other case remove AUTO_BW flag while we calculate
858 * maximum bandwidth correctly and auto calculation is
861 if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
862 (rule2->flags & NL80211_RRF_AUTO_BW))
863 intersected_rule->flags |= NL80211_RRF_AUTO_BW;
865 intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
867 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
868 if (freq_range->max_bandwidth_khz > freq_diff)
869 freq_range->max_bandwidth_khz = freq_diff;
871 power_rule->max_eirp = min(power_rule1->max_eirp,
872 power_rule2->max_eirp);
873 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
874 power_rule2->max_antenna_gain);
876 intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms,
879 if (!is_valid_reg_rule(intersected_rule))
885 /* check whether old rule contains new rule */
886 static bool rule_contains(struct ieee80211_reg_rule *r1,
887 struct ieee80211_reg_rule *r2)
889 /* for simplicity, currently consider only same flags */
890 if (r1->flags != r2->flags)
893 /* verify r1 is more restrictive */
894 if ((r1->power_rule.max_antenna_gain >
895 r2->power_rule.max_antenna_gain) ||
896 r1->power_rule.max_eirp > r2->power_rule.max_eirp)
899 /* make sure r2's range is contained within r1 */
900 if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz ||
901 r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz)
904 /* and finally verify that r1.max_bw >= r2.max_bw */
905 if (r1->freq_range.max_bandwidth_khz <
906 r2->freq_range.max_bandwidth_khz)
912 /* add or extend current rules. do nothing if rule is already contained */
913 static void add_rule(struct ieee80211_reg_rule *rule,
914 struct ieee80211_reg_rule *reg_rules, u32 *n_rules)
916 struct ieee80211_reg_rule *tmp_rule;
919 for (i = 0; i < *n_rules; i++) {
920 tmp_rule = ®_rules[i];
921 /* rule is already contained - do nothing */
922 if (rule_contains(tmp_rule, rule))
925 /* extend rule if possible */
926 if (rule_contains(rule, tmp_rule)) {
927 memcpy(tmp_rule, rule, sizeof(*rule));
932 memcpy(®_rules[*n_rules], rule, sizeof(*rule));
937 * regdom_intersect - do the intersection between two regulatory domains
938 * @rd1: first regulatory domain
939 * @rd2: second regulatory domain
941 * Use this function to get the intersection between two regulatory domains.
942 * Once completed we will mark the alpha2 for the rd as intersected, "98",
943 * as no one single alpha2 can represent this regulatory domain.
945 * Returns a pointer to the regulatory domain structure which will hold the
946 * resulting intersection of rules between rd1 and rd2. We will
947 * kzalloc() this structure for you.
949 static struct ieee80211_regdomain *
950 regdom_intersect(const struct ieee80211_regdomain *rd1,
951 const struct ieee80211_regdomain *rd2)
955 unsigned int num_rules = 0;
956 const struct ieee80211_reg_rule *rule1, *rule2;
957 struct ieee80211_reg_rule intersected_rule;
958 struct ieee80211_regdomain *rd;
964 * First we get a count of the rules we'll need, then we actually
965 * build them. This is to so we can malloc() and free() a
966 * regdomain once. The reason we use reg_rules_intersect() here
967 * is it will return -EINVAL if the rule computed makes no sense.
968 * All rules that do check out OK are valid.
971 for (x = 0; x < rd1->n_reg_rules; x++) {
972 rule1 = &rd1->reg_rules[x];
973 for (y = 0; y < rd2->n_reg_rules; y++) {
974 rule2 = &rd2->reg_rules[y];
975 if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
984 size_of_regd = sizeof(struct ieee80211_regdomain) +
985 num_rules * sizeof(struct ieee80211_reg_rule);
987 rd = kzalloc(size_of_regd, GFP_KERNEL);
991 for (x = 0; x < rd1->n_reg_rules; x++) {
992 rule1 = &rd1->reg_rules[x];
993 for (y = 0; y < rd2->n_reg_rules; y++) {
994 rule2 = &rd2->reg_rules[y];
995 r = reg_rules_intersect(rd1, rd2, rule1, rule2,
998 * No need to memset here the intersected rule here as
999 * we're not using the stack anymore
1004 add_rule(&intersected_rule, rd->reg_rules,
1009 rd->alpha2[0] = '9';
1010 rd->alpha2[1] = '8';
1011 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
1018 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
1019 * want to just have the channel structure use these
1021 static u32 map_regdom_flags(u32 rd_flags)
1023 u32 channel_flags = 0;
1024 if (rd_flags & NL80211_RRF_NO_IR_ALL)
1025 channel_flags |= IEEE80211_CHAN_NO_IR;
1026 if (rd_flags & NL80211_RRF_DFS)
1027 channel_flags |= IEEE80211_CHAN_RADAR;
1028 if (rd_flags & NL80211_RRF_NO_OFDM)
1029 channel_flags |= IEEE80211_CHAN_NO_OFDM;
1030 if (rd_flags & NL80211_RRF_NO_OUTDOOR)
1031 channel_flags |= IEEE80211_CHAN_INDOOR_ONLY;
1032 if (rd_flags & NL80211_RRF_IR_CONCURRENT)
1033 channel_flags |= IEEE80211_CHAN_IR_CONCURRENT;
1034 if (rd_flags & NL80211_RRF_NO_HT40MINUS)
1035 channel_flags |= IEEE80211_CHAN_NO_HT40MINUS;
1036 if (rd_flags & NL80211_RRF_NO_HT40PLUS)
1037 channel_flags |= IEEE80211_CHAN_NO_HT40PLUS;
1038 if (rd_flags & NL80211_RRF_NO_80MHZ)
1039 channel_flags |= IEEE80211_CHAN_NO_80MHZ;
1040 if (rd_flags & NL80211_RRF_NO_160MHZ)
1041 channel_flags |= IEEE80211_CHAN_NO_160MHZ;
1042 return channel_flags;
1045 static const struct ieee80211_reg_rule *
1046 freq_reg_info_regd(u32 center_freq,
1047 const struct ieee80211_regdomain *regd, u32 bw)
1050 bool band_rule_found = false;
1051 bool bw_fits = false;
1054 return ERR_PTR(-EINVAL);
1056 for (i = 0; i < regd->n_reg_rules; i++) {
1057 const struct ieee80211_reg_rule *rr;
1058 const struct ieee80211_freq_range *fr = NULL;
1060 rr = ®d->reg_rules[i];
1061 fr = &rr->freq_range;
1064 * We only need to know if one frequency rule was
1065 * was in center_freq's band, that's enough, so lets
1066 * not overwrite it once found
1068 if (!band_rule_found)
1069 band_rule_found = freq_in_rule_band(fr, center_freq);
1071 bw_fits = reg_does_bw_fit(fr, center_freq, bw);
1073 if (band_rule_found && bw_fits)
1077 if (!band_rule_found)
1078 return ERR_PTR(-ERANGE);
1080 return ERR_PTR(-EINVAL);
1083 static const struct ieee80211_reg_rule *
1084 __freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
1086 const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy);
1087 const struct ieee80211_reg_rule *reg_rule = NULL;
1090 for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
1091 reg_rule = freq_reg_info_regd(center_freq, regd, bw);
1092 if (!IS_ERR(reg_rule))
1099 const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
1102 return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(20));
1104 EXPORT_SYMBOL(freq_reg_info);
1106 const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
1108 switch (initiator) {
1109 case NL80211_REGDOM_SET_BY_CORE:
1111 case NL80211_REGDOM_SET_BY_USER:
1113 case NL80211_REGDOM_SET_BY_DRIVER:
1115 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1116 return "country IE";
1122 EXPORT_SYMBOL(reg_initiator_name);
1124 static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd,
1125 const struct ieee80211_reg_rule *reg_rule,
1126 const struct ieee80211_channel *chan)
1128 const struct ieee80211_freq_range *freq_range = NULL;
1129 u32 max_bandwidth_khz, bw_flags = 0;
1131 freq_range = ®_rule->freq_range;
1133 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1134 /* Check if auto calculation requested */
1135 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
1136 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1138 /* If we get a reg_rule we can assume that at least 5Mhz fit */
1139 if (!reg_does_bw_fit(freq_range, MHZ_TO_KHZ(chan->center_freq),
1141 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1142 if (!reg_does_bw_fit(freq_range, MHZ_TO_KHZ(chan->center_freq),
1144 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1146 if (max_bandwidth_khz < MHZ_TO_KHZ(10))
1147 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1148 if (max_bandwidth_khz < MHZ_TO_KHZ(20))
1149 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1150 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1151 bw_flags |= IEEE80211_CHAN_NO_HT40;
1152 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1153 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1154 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1155 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1160 * Note that right now we assume the desired channel bandwidth
1161 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
1162 * per channel, the primary and the extension channel).
1164 static void handle_channel(struct wiphy *wiphy,
1165 enum nl80211_reg_initiator initiator,
1166 struct ieee80211_channel *chan)
1168 u32 flags, bw_flags = 0;
1169 const struct ieee80211_reg_rule *reg_rule = NULL;
1170 const struct ieee80211_power_rule *power_rule = NULL;
1171 struct wiphy *request_wiphy = NULL;
1172 struct regulatory_request *lr = get_last_request();
1173 const struct ieee80211_regdomain *regd;
1175 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1177 flags = chan->orig_flags;
1179 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
1180 if (IS_ERR(reg_rule)) {
1182 * We will disable all channels that do not match our
1183 * received regulatory rule unless the hint is coming
1184 * from a Country IE and the Country IE had no information
1185 * about a band. The IEEE 802.11 spec allows for an AP
1186 * to send only a subset of the regulatory rules allowed,
1187 * so an AP in the US that only supports 2.4 GHz may only send
1188 * a country IE with information for the 2.4 GHz band
1189 * while 5 GHz is still supported.
1191 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1192 PTR_ERR(reg_rule) == -ERANGE)
1195 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1196 request_wiphy && request_wiphy == wiphy &&
1197 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1198 pr_debug("Disabling freq %d MHz for good\n",
1200 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1201 chan->flags = chan->orig_flags;
1203 pr_debug("Disabling freq %d MHz\n",
1205 chan->flags |= IEEE80211_CHAN_DISABLED;
1210 regd = reg_get_regdomain(wiphy);
1212 power_rule = ®_rule->power_rule;
1213 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
1215 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1216 request_wiphy && request_wiphy == wiphy &&
1217 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1219 * This guarantees the driver's requested regulatory domain
1220 * will always be used as a base for further regulatory
1223 chan->flags = chan->orig_flags =
1224 map_regdom_flags(reg_rule->flags) | bw_flags;
1225 chan->max_antenna_gain = chan->orig_mag =
1226 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1227 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
1228 (int) MBM_TO_DBM(power_rule->max_eirp);
1230 if (chan->flags & IEEE80211_CHAN_RADAR) {
1231 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1232 if (reg_rule->dfs_cac_ms)
1233 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1239 chan->dfs_state = NL80211_DFS_USABLE;
1240 chan->dfs_state_entered = jiffies;
1242 chan->beacon_found = false;
1243 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1244 chan->max_antenna_gain =
1245 min_t(int, chan->orig_mag,
1246 MBI_TO_DBI(power_rule->max_antenna_gain));
1247 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1249 if (chan->flags & IEEE80211_CHAN_RADAR) {
1250 if (reg_rule->dfs_cac_ms)
1251 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1253 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1256 if (chan->orig_mpwr) {
1258 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1259 * will always follow the passed country IE power settings.
1261 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1262 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
1263 chan->max_power = chan->max_reg_power;
1265 chan->max_power = min(chan->orig_mpwr,
1266 chan->max_reg_power);
1268 chan->max_power = chan->max_reg_power;
1271 static void handle_band(struct wiphy *wiphy,
1272 enum nl80211_reg_initiator initiator,
1273 struct ieee80211_supported_band *sband)
1280 for (i = 0; i < sband->n_channels; i++)
1281 handle_channel(wiphy, initiator, &sband->channels[i]);
1284 static bool reg_request_cell_base(struct regulatory_request *request)
1286 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1288 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1291 bool reg_last_request_cell_base(void)
1293 return reg_request_cell_base(get_last_request());
1296 #ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
1297 /* Core specific check */
1298 static enum reg_request_treatment
1299 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1301 struct regulatory_request *lr = get_last_request();
1303 if (!reg_num_devs_support_basehint)
1304 return REG_REQ_IGNORE;
1306 if (reg_request_cell_base(lr) &&
1307 !regdom_changes(pending_request->alpha2))
1308 return REG_REQ_ALREADY_SET;
1313 /* Device specific check */
1314 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1316 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1319 static enum reg_request_treatment
1320 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1322 return REG_REQ_IGNORE;
1325 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1331 static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1333 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1334 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1339 static bool ignore_reg_update(struct wiphy *wiphy,
1340 enum nl80211_reg_initiator initiator)
1342 struct regulatory_request *lr = get_last_request();
1344 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
1348 pr_debug("Ignoring regulatory request set by %s since last_request is not set\n",
1349 reg_initiator_name(initiator));
1353 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1354 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1355 pr_debug("Ignoring regulatory request set by %s since the driver uses its own custom regulatory domain\n",
1356 reg_initiator_name(initiator));
1361 * wiphy->regd will be set once the device has its own
1362 * desired regulatory domain set
1364 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1365 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1366 !is_world_regdom(lr->alpha2)) {
1367 pr_debug("Ignoring regulatory request set by %s since the driver requires its own regulatory domain to be set first\n",
1368 reg_initiator_name(initiator));
1372 if (reg_request_cell_base(lr))
1373 return reg_dev_ignore_cell_hint(wiphy);
1378 static bool reg_is_world_roaming(struct wiphy *wiphy)
1380 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1381 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1382 struct regulatory_request *lr = get_last_request();
1384 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1387 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1388 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1394 static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1395 struct reg_beacon *reg_beacon)
1397 struct ieee80211_supported_band *sband;
1398 struct ieee80211_channel *chan;
1399 bool channel_changed = false;
1400 struct ieee80211_channel chan_before;
1402 sband = wiphy->bands[reg_beacon->chan.band];
1403 chan = &sband->channels[chan_idx];
1405 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1408 if (chan->beacon_found)
1411 chan->beacon_found = true;
1413 if (!reg_is_world_roaming(wiphy))
1416 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1419 chan_before.center_freq = chan->center_freq;
1420 chan_before.flags = chan->flags;
1422 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1423 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1424 channel_changed = true;
1427 if (channel_changed)
1428 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1432 * Called when a scan on a wiphy finds a beacon on
1435 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1436 struct reg_beacon *reg_beacon)
1439 struct ieee80211_supported_band *sband;
1441 if (!wiphy->bands[reg_beacon->chan.band])
1444 sband = wiphy->bands[reg_beacon->chan.band];
1446 for (i = 0; i < sband->n_channels; i++)
1447 handle_reg_beacon(wiphy, i, reg_beacon);
1451 * Called upon reg changes or a new wiphy is added
1453 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1456 struct ieee80211_supported_band *sband;
1457 struct reg_beacon *reg_beacon;
1459 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1460 if (!wiphy->bands[reg_beacon->chan.band])
1462 sband = wiphy->bands[reg_beacon->chan.band];
1463 for (i = 0; i < sband->n_channels; i++)
1464 handle_reg_beacon(wiphy, i, reg_beacon);
1468 /* Reap the advantages of previously found beacons */
1469 static void reg_process_beacons(struct wiphy *wiphy)
1472 * Means we are just firing up cfg80211, so no beacons would
1473 * have been processed yet.
1477 wiphy_update_beacon_reg(wiphy);
1480 static bool is_ht40_allowed(struct ieee80211_channel *chan)
1484 if (chan->flags & IEEE80211_CHAN_DISABLED)
1486 /* This would happen when regulatory rules disallow HT40 completely */
1487 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
1492 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1493 struct ieee80211_channel *channel)
1495 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
1496 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1499 if (!is_ht40_allowed(channel)) {
1500 channel->flags |= IEEE80211_CHAN_NO_HT40;
1505 * We need to ensure the extension channels exist to
1506 * be able to use HT40- or HT40+, this finds them (or not)
1508 for (i = 0; i < sband->n_channels; i++) {
1509 struct ieee80211_channel *c = &sband->channels[i];
1511 if (c->center_freq == (channel->center_freq - 20))
1513 if (c->center_freq == (channel->center_freq + 20))
1518 * Please note that this assumes target bandwidth is 20 MHz,
1519 * if that ever changes we also need to change the below logic
1520 * to include that as well.
1522 if (!is_ht40_allowed(channel_before))
1523 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1525 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1527 if (!is_ht40_allowed(channel_after))
1528 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1530 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1533 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1534 struct ieee80211_supported_band *sband)
1541 for (i = 0; i < sband->n_channels; i++)
1542 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
1545 static void reg_process_ht_flags(struct wiphy *wiphy)
1547 enum ieee80211_band band;
1552 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1553 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
1556 static void reg_call_notifier(struct wiphy *wiphy,
1557 struct regulatory_request *request)
1559 if (wiphy->reg_notifier)
1560 wiphy->reg_notifier(wiphy, request);
1563 static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
1565 struct cfg80211_chan_def chandef;
1566 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1567 enum nl80211_iftype iftype;
1570 iftype = wdev->iftype;
1572 /* make sure the interface is active */
1573 if (!wdev->netdev || !netif_running(wdev->netdev))
1574 goto wdev_inactive_unlock;
1577 case NL80211_IFTYPE_AP:
1578 case NL80211_IFTYPE_P2P_GO:
1579 if (!wdev->beacon_interval)
1580 goto wdev_inactive_unlock;
1581 chandef = wdev->chandef;
1583 case NL80211_IFTYPE_ADHOC:
1584 if (!wdev->ssid_len)
1585 goto wdev_inactive_unlock;
1586 chandef = wdev->chandef;
1588 case NL80211_IFTYPE_STATION:
1589 case NL80211_IFTYPE_P2P_CLIENT:
1590 if (!wdev->current_bss ||
1591 !wdev->current_bss->pub.channel)
1592 goto wdev_inactive_unlock;
1594 if (!rdev->ops->get_channel ||
1595 rdev_get_channel(rdev, wdev, &chandef))
1596 cfg80211_chandef_create(&chandef,
1597 wdev->current_bss->pub.channel,
1598 NL80211_CHAN_NO_HT);
1600 case NL80211_IFTYPE_MONITOR:
1601 case NL80211_IFTYPE_AP_VLAN:
1602 case NL80211_IFTYPE_P2P_DEVICE:
1603 /* no enforcement required */
1606 /* others not implemented for now */
1614 case NL80211_IFTYPE_AP:
1615 case NL80211_IFTYPE_P2P_GO:
1616 case NL80211_IFTYPE_ADHOC:
1617 return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
1618 case NL80211_IFTYPE_STATION:
1619 case NL80211_IFTYPE_P2P_CLIENT:
1620 return cfg80211_chandef_usable(wiphy, &chandef,
1621 IEEE80211_CHAN_DISABLED);
1628 wdev_inactive_unlock:
1633 static void reg_leave_invalid_chans(struct wiphy *wiphy)
1635 struct wireless_dev *wdev;
1636 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1640 list_for_each_entry(wdev, &rdev->wdev_list, list)
1641 if (!reg_wdev_chan_valid(wiphy, wdev))
1642 cfg80211_leave(rdev, wdev);
1645 static void reg_check_chans_work(struct work_struct *work)
1647 struct cfg80211_registered_device *rdev;
1649 pr_debug("Verifying active interfaces after reg change\n");
1652 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1653 if (!(rdev->wiphy.regulatory_flags &
1654 REGULATORY_IGNORE_STALE_KICKOFF))
1655 reg_leave_invalid_chans(&rdev->wiphy);
1660 static void reg_check_channels(void)
1663 * Give usermode a chance to do something nicer (move to another
1664 * channel, orderly disconnection), before forcing a disconnection.
1666 mod_delayed_work(system_power_efficient_wq,
1668 msecs_to_jiffies(REG_ENFORCE_GRACE_MS));
1671 static void wiphy_update_regulatory(struct wiphy *wiphy,
1672 enum nl80211_reg_initiator initiator)
1674 enum ieee80211_band band;
1675 struct regulatory_request *lr = get_last_request();
1677 if (ignore_reg_update(wiphy, initiator)) {
1679 * Regulatory updates set by CORE are ignored for custom
1680 * regulatory cards. Let us notify the changes to the driver,
1681 * as some drivers used this to restore its orig_* reg domain.
1683 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1684 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1685 reg_call_notifier(wiphy, lr);
1689 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
1691 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1692 handle_band(wiphy, initiator, wiphy->bands[band]);
1694 reg_process_beacons(wiphy);
1695 reg_process_ht_flags(wiphy);
1696 reg_call_notifier(wiphy, lr);
1699 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1701 struct cfg80211_registered_device *rdev;
1702 struct wiphy *wiphy;
1706 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1707 wiphy = &rdev->wiphy;
1708 wiphy_update_regulatory(wiphy, initiator);
1711 reg_check_channels();
1714 static void handle_channel_custom(struct wiphy *wiphy,
1715 struct ieee80211_channel *chan,
1716 const struct ieee80211_regdomain *regd)
1719 const struct ieee80211_reg_rule *reg_rule = NULL;
1720 const struct ieee80211_power_rule *power_rule = NULL;
1723 for (bw = MHZ_TO_KHZ(20); bw >= MHZ_TO_KHZ(5); bw = bw / 2) {
1724 reg_rule = freq_reg_info_regd(MHZ_TO_KHZ(chan->center_freq),
1726 if (!IS_ERR(reg_rule))
1730 if (IS_ERR(reg_rule)) {
1731 pr_debug("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1733 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
1734 chan->flags |= IEEE80211_CHAN_DISABLED;
1736 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1737 chan->flags = chan->orig_flags;
1742 power_rule = ®_rule->power_rule;
1743 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
1745 chan->dfs_state_entered = jiffies;
1746 chan->dfs_state = NL80211_DFS_USABLE;
1748 chan->beacon_found = false;
1750 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
1751 chan->flags = chan->orig_flags | bw_flags |
1752 map_regdom_flags(reg_rule->flags);
1754 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1756 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1757 chan->max_reg_power = chan->max_power =
1758 (int) MBM_TO_DBM(power_rule->max_eirp);
1760 if (chan->flags & IEEE80211_CHAN_RADAR) {
1761 if (reg_rule->dfs_cac_ms)
1762 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1764 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1767 chan->max_power = chan->max_reg_power;
1770 static void handle_band_custom(struct wiphy *wiphy,
1771 struct ieee80211_supported_band *sband,
1772 const struct ieee80211_regdomain *regd)
1779 for (i = 0; i < sband->n_channels; i++)
1780 handle_channel_custom(wiphy, &sband->channels[i], regd);
1783 /* Used by drivers prior to wiphy registration */
1784 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1785 const struct ieee80211_regdomain *regd)
1787 enum ieee80211_band band;
1788 unsigned int bands_set = 0;
1790 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
1791 "wiphy should have REGULATORY_CUSTOM_REG\n");
1792 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
1794 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1795 if (!wiphy->bands[band])
1797 handle_band_custom(wiphy, wiphy->bands[band], regd);
1802 * no point in calling this if it won't have any effect
1803 * on your device's supported bands.
1805 WARN_ON(!bands_set);
1807 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1809 static void reg_set_request_processed(void)
1811 bool need_more_processing = false;
1812 struct regulatory_request *lr = get_last_request();
1814 lr->processed = true;
1816 spin_lock(®_requests_lock);
1817 if (!list_empty(®_requests_list))
1818 need_more_processing = true;
1819 spin_unlock(®_requests_lock);
1821 cancel_crda_timeout();
1823 if (need_more_processing)
1824 schedule_work(®_work);
1828 * reg_process_hint_core - process core regulatory requests
1829 * @pending_request: a pending core regulatory request
1831 * The wireless subsystem can use this function to process
1832 * a regulatory request issued by the regulatory core.
1834 static enum reg_request_treatment
1835 reg_process_hint_core(struct regulatory_request *core_request)
1837 if (reg_query_database(core_request)) {
1838 core_request->intersect = false;
1839 core_request->processed = false;
1840 reg_update_last_request(core_request);
1844 return REG_REQ_IGNORE;
1847 static enum reg_request_treatment
1848 __reg_process_hint_user(struct regulatory_request *user_request)
1850 struct regulatory_request *lr = get_last_request();
1852 if (reg_request_cell_base(user_request))
1853 return reg_ignore_cell_hint(user_request);
1855 if (reg_request_cell_base(lr))
1856 return REG_REQ_IGNORE;
1858 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1859 return REG_REQ_INTERSECT;
1861 * If the user knows better the user should set the regdom
1862 * to their country before the IE is picked up
1864 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
1866 return REG_REQ_IGNORE;
1868 * Process user requests only after previous user/driver/core
1869 * requests have been processed
1871 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
1872 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1873 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
1874 regdom_changes(lr->alpha2))
1875 return REG_REQ_IGNORE;
1877 if (!regdom_changes(user_request->alpha2))
1878 return REG_REQ_ALREADY_SET;
1884 * reg_process_hint_user - process user regulatory requests
1885 * @user_request: a pending user regulatory request
1887 * The wireless subsystem can use this function to process
1888 * a regulatory request initiated by userspace.
1890 static enum reg_request_treatment
1891 reg_process_hint_user(struct regulatory_request *user_request)
1893 enum reg_request_treatment treatment;
1895 treatment = __reg_process_hint_user(user_request);
1896 if (treatment == REG_REQ_IGNORE ||
1897 treatment == REG_REQ_ALREADY_SET)
1898 return REG_REQ_IGNORE;
1900 user_request->intersect = treatment == REG_REQ_INTERSECT;
1901 user_request->processed = false;
1903 if (reg_query_database(user_request)) {
1904 reg_update_last_request(user_request);
1905 user_alpha2[0] = user_request->alpha2[0];
1906 user_alpha2[1] = user_request->alpha2[1];
1910 return REG_REQ_IGNORE;
1913 static enum reg_request_treatment
1914 __reg_process_hint_driver(struct regulatory_request *driver_request)
1916 struct regulatory_request *lr = get_last_request();
1918 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
1919 if (regdom_changes(driver_request->alpha2))
1921 return REG_REQ_ALREADY_SET;
1925 * This would happen if you unplug and plug your card
1926 * back in or if you add a new device for which the previously
1927 * loaded card also agrees on the regulatory domain.
1929 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1930 !regdom_changes(driver_request->alpha2))
1931 return REG_REQ_ALREADY_SET;
1933 return REG_REQ_INTERSECT;
1937 * reg_process_hint_driver - process driver regulatory requests
1938 * @driver_request: a pending driver regulatory request
1940 * The wireless subsystem can use this function to process
1941 * a regulatory request issued by an 802.11 driver.
1943 * Returns one of the different reg request treatment values.
1945 static enum reg_request_treatment
1946 reg_process_hint_driver(struct wiphy *wiphy,
1947 struct regulatory_request *driver_request)
1949 const struct ieee80211_regdomain *regd, *tmp;
1950 enum reg_request_treatment treatment;
1952 treatment = __reg_process_hint_driver(driver_request);
1954 switch (treatment) {
1957 case REG_REQ_IGNORE:
1958 return REG_REQ_IGNORE;
1959 case REG_REQ_INTERSECT:
1960 case REG_REQ_ALREADY_SET:
1961 regd = reg_copy_regd(get_cfg80211_regdom());
1963 return REG_REQ_IGNORE;
1965 tmp = get_wiphy_regdom(wiphy);
1966 rcu_assign_pointer(wiphy->regd, regd);
1967 rcu_free_regdom(tmp);
1971 driver_request->intersect = treatment == REG_REQ_INTERSECT;
1972 driver_request->processed = false;
1975 * Since CRDA will not be called in this case as we already
1976 * have applied the requested regulatory domain before we just
1977 * inform userspace we have processed the request
1979 if (treatment == REG_REQ_ALREADY_SET) {
1980 nl80211_send_reg_change_event(driver_request);
1981 reg_update_last_request(driver_request);
1982 reg_set_request_processed();
1983 return REG_REQ_ALREADY_SET;
1986 if (reg_query_database(driver_request)) {
1987 reg_update_last_request(driver_request);
1991 return REG_REQ_IGNORE;
1994 static enum reg_request_treatment
1995 __reg_process_hint_country_ie(struct wiphy *wiphy,
1996 struct regulatory_request *country_ie_request)
1998 struct wiphy *last_wiphy = NULL;
1999 struct regulatory_request *lr = get_last_request();
2001 if (reg_request_cell_base(lr)) {
2002 /* Trust a Cell base station over the AP's country IE */
2003 if (regdom_changes(country_ie_request->alpha2))
2004 return REG_REQ_IGNORE;
2005 return REG_REQ_ALREADY_SET;
2007 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
2008 return REG_REQ_IGNORE;
2011 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
2014 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
2017 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2019 if (last_wiphy != wiphy) {
2021 * Two cards with two APs claiming different
2022 * Country IE alpha2s. We could
2023 * intersect them, but that seems unlikely
2024 * to be correct. Reject second one for now.
2026 if (regdom_changes(country_ie_request->alpha2))
2027 return REG_REQ_IGNORE;
2028 return REG_REQ_ALREADY_SET;
2031 if (regdom_changes(country_ie_request->alpha2))
2033 return REG_REQ_ALREADY_SET;
2037 * reg_process_hint_country_ie - process regulatory requests from country IEs
2038 * @country_ie_request: a regulatory request from a country IE
2040 * The wireless subsystem can use this function to process
2041 * a regulatory request issued by a country Information Element.
2043 * Returns one of the different reg request treatment values.
2045 static enum reg_request_treatment
2046 reg_process_hint_country_ie(struct wiphy *wiphy,
2047 struct regulatory_request *country_ie_request)
2049 enum reg_request_treatment treatment;
2051 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
2053 switch (treatment) {
2056 case REG_REQ_IGNORE:
2057 return REG_REQ_IGNORE;
2058 case REG_REQ_ALREADY_SET:
2059 reg_free_request(country_ie_request);
2060 return REG_REQ_ALREADY_SET;
2061 case REG_REQ_INTERSECT:
2063 * This doesn't happen yet, not sure we
2064 * ever want to support it for this case.
2066 WARN_ONCE(1, "Unexpected intersection for country IEs");
2067 return REG_REQ_IGNORE;
2070 country_ie_request->intersect = false;
2071 country_ie_request->processed = false;
2073 if (reg_query_database(country_ie_request)) {
2074 reg_update_last_request(country_ie_request);
2078 return REG_REQ_IGNORE;
2081 /* This processes *all* regulatory hints */
2082 static void reg_process_hint(struct regulatory_request *reg_request)
2084 struct wiphy *wiphy = NULL;
2085 enum reg_request_treatment treatment;
2087 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
2088 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
2090 switch (reg_request->initiator) {
2091 case NL80211_REGDOM_SET_BY_CORE:
2092 treatment = reg_process_hint_core(reg_request);
2094 case NL80211_REGDOM_SET_BY_USER:
2095 treatment = reg_process_hint_user(reg_request);
2097 case NL80211_REGDOM_SET_BY_DRIVER:
2100 treatment = reg_process_hint_driver(wiphy, reg_request);
2102 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2105 treatment = reg_process_hint_country_ie(wiphy, reg_request);
2108 WARN(1, "invalid initiator %d\n", reg_request->initiator);
2112 if (treatment == REG_REQ_IGNORE)
2115 WARN(treatment != REG_REQ_OK && treatment != REG_REQ_ALREADY_SET,
2116 "unexpected treatment value %d\n", treatment);
2118 /* This is required so that the orig_* parameters are saved.
2119 * NOTE: treatment must be set for any case that reaches here!
2121 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
2122 wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
2123 wiphy_update_regulatory(wiphy, reg_request->initiator);
2124 reg_check_channels();
2130 reg_free_request(reg_request);
2133 static bool reg_only_self_managed_wiphys(void)
2135 struct cfg80211_registered_device *rdev;
2136 struct wiphy *wiphy;
2137 bool self_managed_found = false;
2141 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2142 wiphy = &rdev->wiphy;
2143 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
2144 self_managed_found = true;
2149 /* make sure at least one self-managed wiphy exists */
2150 return self_managed_found;
2154 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
2155 * Regulatory hints come on a first come first serve basis and we
2156 * must process each one atomically.
2158 static void reg_process_pending_hints(void)
2160 struct regulatory_request *reg_request, *lr;
2162 lr = get_last_request();
2164 /* When last_request->processed becomes true this will be rescheduled */
2165 if (lr && !lr->processed) {
2166 reg_process_hint(lr);
2170 spin_lock(®_requests_lock);
2172 if (list_empty(®_requests_list)) {
2173 spin_unlock(®_requests_lock);
2177 reg_request = list_first_entry(®_requests_list,
2178 struct regulatory_request,
2180 list_del_init(®_request->list);
2182 spin_unlock(®_requests_lock);
2184 if (reg_only_self_managed_wiphys()) {
2185 reg_free_request(reg_request);
2189 reg_process_hint(reg_request);
2191 lr = get_last_request();
2193 spin_lock(®_requests_lock);
2194 if (!list_empty(®_requests_list) && lr && lr->processed)
2195 schedule_work(®_work);
2196 spin_unlock(®_requests_lock);
2199 /* Processes beacon hints -- this has nothing to do with country IEs */
2200 static void reg_process_pending_beacon_hints(void)
2202 struct cfg80211_registered_device *rdev;
2203 struct reg_beacon *pending_beacon, *tmp;
2205 /* This goes through the _pending_ beacon list */
2206 spin_lock_bh(®_pending_beacons_lock);
2208 list_for_each_entry_safe(pending_beacon, tmp,
2209 ®_pending_beacons, list) {
2210 list_del_init(&pending_beacon->list);
2212 /* Applies the beacon hint to current wiphys */
2213 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
2214 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
2216 /* Remembers the beacon hint for new wiphys or reg changes */
2217 list_add_tail(&pending_beacon->list, ®_beacon_list);
2220 spin_unlock_bh(®_pending_beacons_lock);
2223 static void reg_process_self_managed_hints(void)
2225 struct cfg80211_registered_device *rdev;
2226 struct wiphy *wiphy;
2227 const struct ieee80211_regdomain *tmp;
2228 const struct ieee80211_regdomain *regd;
2229 enum ieee80211_band band;
2230 struct regulatory_request request = {};
2232 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2233 wiphy = &rdev->wiphy;
2235 spin_lock(®_requests_lock);
2236 regd = rdev->requested_regd;
2237 rdev->requested_regd = NULL;
2238 spin_unlock(®_requests_lock);
2243 tmp = get_wiphy_regdom(wiphy);
2244 rcu_assign_pointer(wiphy->regd, regd);
2245 rcu_free_regdom(tmp);
2247 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
2248 handle_band_custom(wiphy, wiphy->bands[band], regd);
2250 reg_process_ht_flags(wiphy);
2252 request.wiphy_idx = get_wiphy_idx(wiphy);
2253 request.alpha2[0] = regd->alpha2[0];
2254 request.alpha2[1] = regd->alpha2[1];
2255 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
2257 nl80211_send_wiphy_reg_change_event(&request);
2260 reg_check_channels();
2263 static void reg_todo(struct work_struct *work)
2266 reg_process_pending_hints();
2267 reg_process_pending_beacon_hints();
2268 reg_process_self_managed_hints();
2272 static void queue_regulatory_request(struct regulatory_request *request)
2274 request->alpha2[0] = toupper(request->alpha2[0]);
2275 request->alpha2[1] = toupper(request->alpha2[1]);
2277 spin_lock(®_requests_lock);
2278 list_add_tail(&request->list, ®_requests_list);
2279 spin_unlock(®_requests_lock);
2281 schedule_work(®_work);
2285 * Core regulatory hint -- happens during cfg80211_init()
2286 * and when we restore regulatory settings.
2288 static int regulatory_hint_core(const char *alpha2)
2290 struct regulatory_request *request;
2292 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2296 request->alpha2[0] = alpha2[0];
2297 request->alpha2[1] = alpha2[1];
2298 request->initiator = NL80211_REGDOM_SET_BY_CORE;
2300 queue_regulatory_request(request);
2306 int regulatory_hint_user(const char *alpha2,
2307 enum nl80211_user_reg_hint_type user_reg_hint_type)
2309 struct regulatory_request *request;
2311 if (WARN_ON(!alpha2))
2314 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2318 request->wiphy_idx = WIPHY_IDX_INVALID;
2319 request->alpha2[0] = alpha2[0];
2320 request->alpha2[1] = alpha2[1];
2321 request->initiator = NL80211_REGDOM_SET_BY_USER;
2322 request->user_reg_hint_type = user_reg_hint_type;
2324 /* Allow calling CRDA again */
2325 reset_crda_timeouts();
2327 queue_regulatory_request(request);
2332 int regulatory_hint_indoor(bool is_indoor, u32 portid)
2334 spin_lock(®_indoor_lock);
2336 /* It is possible that more than one user space process is trying to
2337 * configure the indoor setting. To handle such cases, clear the indoor
2338 * setting in case that some process does not think that the device
2339 * is operating in an indoor environment. In addition, if a user space
2340 * process indicates that it is controlling the indoor setting, save its
2341 * portid, i.e., make it the owner.
2343 reg_is_indoor = is_indoor;
2344 if (reg_is_indoor) {
2345 if (!reg_is_indoor_portid)
2346 reg_is_indoor_portid = portid;
2348 reg_is_indoor_portid = 0;
2351 spin_unlock(®_indoor_lock);
2354 reg_check_channels();
2359 void regulatory_netlink_notify(u32 portid)
2361 spin_lock(®_indoor_lock);
2363 if (reg_is_indoor_portid != portid) {
2364 spin_unlock(®_indoor_lock);
2368 reg_is_indoor = false;
2369 reg_is_indoor_portid = 0;
2371 spin_unlock(®_indoor_lock);
2373 reg_check_channels();
2377 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
2379 struct regulatory_request *request;
2381 if (WARN_ON(!alpha2 || !wiphy))
2384 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
2386 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2390 request->wiphy_idx = get_wiphy_idx(wiphy);
2392 request->alpha2[0] = alpha2[0];
2393 request->alpha2[1] = alpha2[1];
2394 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
2396 /* Allow calling CRDA again */
2397 reset_crda_timeouts();
2399 queue_regulatory_request(request);
2403 EXPORT_SYMBOL(regulatory_hint);
2405 void regulatory_hint_country_ie(struct wiphy *wiphy, enum ieee80211_band band,
2406 const u8 *country_ie, u8 country_ie_len)
2409 enum environment_cap env = ENVIRON_ANY;
2410 struct regulatory_request *request = NULL, *lr;
2412 /* IE len must be evenly divisible by 2 */
2413 if (country_ie_len & 0x01)
2416 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
2419 request = kzalloc(sizeof(*request), GFP_KERNEL);
2423 alpha2[0] = country_ie[0];
2424 alpha2[1] = country_ie[1];
2426 if (country_ie[2] == 'I')
2427 env = ENVIRON_INDOOR;
2428 else if (country_ie[2] == 'O')
2429 env = ENVIRON_OUTDOOR;
2432 lr = get_last_request();
2438 * We will run this only upon a successful connection on cfg80211.
2439 * We leave conflict resolution to the workqueue, where can hold
2442 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
2443 lr->wiphy_idx != WIPHY_IDX_INVALID)
2446 request->wiphy_idx = get_wiphy_idx(wiphy);
2447 request->alpha2[0] = alpha2[0];
2448 request->alpha2[1] = alpha2[1];
2449 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
2450 request->country_ie_env = env;
2452 /* Allow calling CRDA again */
2453 reset_crda_timeouts();
2455 queue_regulatory_request(request);
2462 static void restore_alpha2(char *alpha2, bool reset_user)
2464 /* indicates there is no alpha2 to consider for restoration */
2468 /* The user setting has precedence over the module parameter */
2469 if (is_user_regdom_saved()) {
2470 /* Unless we're asked to ignore it and reset it */
2472 pr_debug("Restoring regulatory settings including user preference\n");
2473 user_alpha2[0] = '9';
2474 user_alpha2[1] = '7';
2477 * If we're ignoring user settings, we still need to
2478 * check the module parameter to ensure we put things
2479 * back as they were for a full restore.
2481 if (!is_world_regdom(ieee80211_regdom)) {
2482 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2483 ieee80211_regdom[0], ieee80211_regdom[1]);
2484 alpha2[0] = ieee80211_regdom[0];
2485 alpha2[1] = ieee80211_regdom[1];
2488 pr_debug("Restoring regulatory settings while preserving user preference for: %c%c\n",
2489 user_alpha2[0], user_alpha2[1]);
2490 alpha2[0] = user_alpha2[0];
2491 alpha2[1] = user_alpha2[1];
2493 } else if (!is_world_regdom(ieee80211_regdom)) {
2494 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2495 ieee80211_regdom[0], ieee80211_regdom[1]);
2496 alpha2[0] = ieee80211_regdom[0];
2497 alpha2[1] = ieee80211_regdom[1];
2499 pr_debug("Restoring regulatory settings\n");
2502 static void restore_custom_reg_settings(struct wiphy *wiphy)
2504 struct ieee80211_supported_band *sband;
2505 enum ieee80211_band band;
2506 struct ieee80211_channel *chan;
2509 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
2510 sband = wiphy->bands[band];
2513 for (i = 0; i < sband->n_channels; i++) {
2514 chan = &sband->channels[i];
2515 chan->flags = chan->orig_flags;
2516 chan->max_antenna_gain = chan->orig_mag;
2517 chan->max_power = chan->orig_mpwr;
2518 chan->beacon_found = false;
2524 * Restoring regulatory settings involves ingoring any
2525 * possibly stale country IE information and user regulatory
2526 * settings if so desired, this includes any beacon hints
2527 * learned as we could have traveled outside to another country
2528 * after disconnection. To restore regulatory settings we do
2529 * exactly what we did at bootup:
2531 * - send a core regulatory hint
2532 * - send a user regulatory hint if applicable
2534 * Device drivers that send a regulatory hint for a specific country
2535 * keep their own regulatory domain on wiphy->regd so that does does
2536 * not need to be remembered.
2538 static void restore_regulatory_settings(bool reset_user)
2541 char world_alpha2[2];
2542 struct reg_beacon *reg_beacon, *btmp;
2543 LIST_HEAD(tmp_reg_req_list);
2544 struct cfg80211_registered_device *rdev;
2549 * Clear the indoor setting in case that it is not controlled by user
2550 * space, as otherwise there is no guarantee that the device is still
2551 * operating in an indoor environment.
2553 spin_lock(®_indoor_lock);
2554 if (reg_is_indoor && !reg_is_indoor_portid) {
2555 reg_is_indoor = false;
2556 reg_check_channels();
2558 spin_unlock(®_indoor_lock);
2560 reset_regdomains(true, &world_regdom);
2561 restore_alpha2(alpha2, reset_user);
2564 * If there's any pending requests we simply
2565 * stash them to a temporary pending queue and
2566 * add then after we've restored regulatory
2569 spin_lock(®_requests_lock);
2570 list_splice_tail_init(®_requests_list, &tmp_reg_req_list);
2571 spin_unlock(®_requests_lock);
2573 /* Clear beacon hints */
2574 spin_lock_bh(®_pending_beacons_lock);
2575 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
2576 list_del(®_beacon->list);
2579 spin_unlock_bh(®_pending_beacons_lock);
2581 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
2582 list_del(®_beacon->list);
2586 /* First restore to the basic regulatory settings */
2587 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
2588 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
2590 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2591 if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
2593 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
2594 restore_custom_reg_settings(&rdev->wiphy);
2597 regulatory_hint_core(world_alpha2);
2600 * This restores the ieee80211_regdom module parameter
2601 * preference or the last user requested regulatory
2602 * settings, user regulatory settings takes precedence.
2604 if (is_an_alpha2(alpha2))
2605 regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER);
2607 spin_lock(®_requests_lock);
2608 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
2609 spin_unlock(®_requests_lock);
2611 pr_debug("Kicking the queue\n");
2613 schedule_work(®_work);
2616 void regulatory_hint_disconnect(void)
2618 pr_debug("All devices are disconnected, going to restore regulatory settings\n");
2619 restore_regulatory_settings(false);
2622 static bool freq_is_chan_12_13_14(u16 freq)
2624 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
2625 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
2626 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
2631 static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
2633 struct reg_beacon *pending_beacon;
2635 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
2636 if (beacon_chan->center_freq ==
2637 pending_beacon->chan.center_freq)
2642 int regulatory_hint_found_beacon(struct wiphy *wiphy,
2643 struct ieee80211_channel *beacon_chan,
2646 struct reg_beacon *reg_beacon;
2649 if (beacon_chan->beacon_found ||
2650 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
2651 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
2652 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
2655 spin_lock_bh(®_pending_beacons_lock);
2656 processing = pending_reg_beacon(beacon_chan);
2657 spin_unlock_bh(®_pending_beacons_lock);
2662 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
2666 pr_debug("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
2667 beacon_chan->center_freq,
2668 ieee80211_frequency_to_channel(beacon_chan->center_freq),
2671 memcpy(®_beacon->chan, beacon_chan,
2672 sizeof(struct ieee80211_channel));
2675 * Since we can be called from BH or and non-BH context
2676 * we must use spin_lock_bh()
2678 spin_lock_bh(®_pending_beacons_lock);
2679 list_add_tail(®_beacon->list, ®_pending_beacons);
2680 spin_unlock_bh(®_pending_beacons_lock);
2682 schedule_work(®_work);
2687 static void print_rd_rules(const struct ieee80211_regdomain *rd)
2690 const struct ieee80211_reg_rule *reg_rule = NULL;
2691 const struct ieee80211_freq_range *freq_range = NULL;
2692 const struct ieee80211_power_rule *power_rule = NULL;
2693 char bw[32], cac_time[32];
2695 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
2697 for (i = 0; i < rd->n_reg_rules; i++) {
2698 reg_rule = &rd->reg_rules[i];
2699 freq_range = ®_rule->freq_range;
2700 power_rule = ®_rule->power_rule;
2702 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
2703 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
2704 freq_range->max_bandwidth_khz,
2705 reg_get_max_bandwidth(rd, reg_rule));
2707 snprintf(bw, sizeof(bw), "%d KHz",
2708 freq_range->max_bandwidth_khz);
2710 if (reg_rule->flags & NL80211_RRF_DFS)
2711 scnprintf(cac_time, sizeof(cac_time), "%u s",
2712 reg_rule->dfs_cac_ms/1000);
2714 scnprintf(cac_time, sizeof(cac_time), "N/A");
2718 * There may not be documentation for max antenna gain
2719 * in certain regions
2721 if (power_rule->max_antenna_gain)
2722 pr_info(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
2723 freq_range->start_freq_khz,
2724 freq_range->end_freq_khz,
2726 power_rule->max_antenna_gain,
2727 power_rule->max_eirp,
2730 pr_info(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
2731 freq_range->start_freq_khz,
2732 freq_range->end_freq_khz,
2734 power_rule->max_eirp,
2739 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
2741 switch (dfs_region) {
2742 case NL80211_DFS_UNSET:
2743 case NL80211_DFS_FCC:
2744 case NL80211_DFS_ETSI:
2745 case NL80211_DFS_JP:
2748 pr_debug("Ignoring uknown DFS master region: %d\n", dfs_region);
2753 static void print_regdomain(const struct ieee80211_regdomain *rd)
2755 struct regulatory_request *lr = get_last_request();
2757 if (is_intersected_alpha2(rd->alpha2)) {
2758 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2759 struct cfg80211_registered_device *rdev;
2760 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
2762 pr_info("Current regulatory domain updated by AP to: %c%c\n",
2763 rdev->country_ie_alpha2[0],
2764 rdev->country_ie_alpha2[1]);
2766 pr_info("Current regulatory domain intersected:\n");
2768 pr_info("Current regulatory domain intersected:\n");
2769 } else if (is_world_regdom(rd->alpha2)) {
2770 pr_info("World regulatory domain updated:\n");
2772 if (is_unknown_alpha2(rd->alpha2))
2773 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
2775 if (reg_request_cell_base(lr))
2776 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
2777 rd->alpha2[0], rd->alpha2[1]);
2779 pr_info("Regulatory domain changed to country: %c%c\n",
2780 rd->alpha2[0], rd->alpha2[1]);
2784 pr_info(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
2788 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2790 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
2794 static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
2796 if (!is_world_regdom(rd->alpha2))
2798 update_world_regdomain(rd);
2802 static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
2803 struct regulatory_request *user_request)
2805 const struct ieee80211_regdomain *intersected_rd = NULL;
2807 if (!regdom_changes(rd->alpha2))
2810 if (!is_valid_rd(rd)) {
2811 pr_err("Invalid regulatory domain detected:\n");
2812 print_regdomain_info(rd);
2816 if (!user_request->intersect) {
2817 reset_regdomains(false, rd);
2821 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2822 if (!intersected_rd)
2827 reset_regdomains(false, intersected_rd);
2832 static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
2833 struct regulatory_request *driver_request)
2835 const struct ieee80211_regdomain *regd;
2836 const struct ieee80211_regdomain *intersected_rd = NULL;
2837 const struct ieee80211_regdomain *tmp;
2838 struct wiphy *request_wiphy;
2840 if (is_world_regdom(rd->alpha2))
2843 if (!regdom_changes(rd->alpha2))
2846 if (!is_valid_rd(rd)) {
2847 pr_err("Invalid regulatory domain detected:\n");
2848 print_regdomain_info(rd);
2852 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
2856 if (!driver_request->intersect) {
2857 if (request_wiphy->regd)
2860 regd = reg_copy_regd(rd);
2862 return PTR_ERR(regd);
2864 rcu_assign_pointer(request_wiphy->regd, regd);
2865 reset_regdomains(false, rd);
2869 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
2870 if (!intersected_rd)
2874 * We can trash what CRDA provided now.
2875 * However if a driver requested this specific regulatory
2876 * domain we keep it for its private use
2878 tmp = get_wiphy_regdom(request_wiphy);
2879 rcu_assign_pointer(request_wiphy->regd, rd);
2880 rcu_free_regdom(tmp);
2884 reset_regdomains(false, intersected_rd);
2889 static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
2890 struct regulatory_request *country_ie_request)
2892 struct wiphy *request_wiphy;
2894 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2895 !is_unknown_alpha2(rd->alpha2))
2899 * Lets only bother proceeding on the same alpha2 if the current
2900 * rd is non static (it means CRDA was present and was used last)
2901 * and the pending request came in from a country IE
2904 if (!is_valid_rd(rd)) {
2905 pr_err("Invalid regulatory domain detected:\n");
2906 print_regdomain_info(rd);
2910 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
2914 if (country_ie_request->intersect)
2917 reset_regdomains(false, rd);
2922 * Use this call to set the current regulatory domain. Conflicts with
2923 * multiple drivers can be ironed out later. Caller must've already
2924 * kmalloc'd the rd structure.
2926 int set_regdom(const struct ieee80211_regdomain *rd,
2927 enum ieee80211_regd_source regd_src)
2929 struct regulatory_request *lr;
2930 bool user_reset = false;
2933 if (!reg_is_valid_request(rd->alpha2)) {
2938 if (regd_src == REGD_SOURCE_CRDA)
2939 reset_crda_timeouts();
2941 lr = get_last_request();
2943 /* Note that this doesn't update the wiphys, this is done below */
2944 switch (lr->initiator) {
2945 case NL80211_REGDOM_SET_BY_CORE:
2946 r = reg_set_rd_core(rd);
2948 case NL80211_REGDOM_SET_BY_USER:
2949 r = reg_set_rd_user(rd, lr);
2952 case NL80211_REGDOM_SET_BY_DRIVER:
2953 r = reg_set_rd_driver(rd, lr);
2955 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2956 r = reg_set_rd_country_ie(rd, lr);
2959 WARN(1, "invalid initiator %d\n", lr->initiator);
2967 reg_set_request_processed();
2970 /* Back to world regulatory in case of errors */
2971 restore_regulatory_settings(user_reset);
2978 /* This would make this whole thing pointless */
2979 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
2982 /* update all wiphys now with the new established regulatory domain */
2983 update_all_wiphy_regulatory(lr->initiator);
2985 print_regdomain(get_cfg80211_regdom());
2987 nl80211_send_reg_change_event(lr);
2989 reg_set_request_processed();
2994 static int __regulatory_set_wiphy_regd(struct wiphy *wiphy,
2995 struct ieee80211_regdomain *rd)
2997 const struct ieee80211_regdomain *regd;
2998 const struct ieee80211_regdomain *prev_regd;
2999 struct cfg80211_registered_device *rdev;
3001 if (WARN_ON(!wiphy || !rd))
3004 if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED),
3005 "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n"))
3008 if (WARN(!is_valid_rd(rd), "Invalid regulatory domain detected\n")) {
3009 print_regdomain_info(rd);
3013 regd = reg_copy_regd(rd);
3015 return PTR_ERR(regd);
3017 rdev = wiphy_to_rdev(wiphy);
3019 spin_lock(®_requests_lock);
3020 prev_regd = rdev->requested_regd;
3021 rdev->requested_regd = regd;
3022 spin_unlock(®_requests_lock);
3028 int regulatory_set_wiphy_regd(struct wiphy *wiphy,
3029 struct ieee80211_regdomain *rd)
3031 int ret = __regulatory_set_wiphy_regd(wiphy, rd);
3036 schedule_work(®_work);
3039 EXPORT_SYMBOL(regulatory_set_wiphy_regd);
3041 int regulatory_set_wiphy_regd_sync_rtnl(struct wiphy *wiphy,
3042 struct ieee80211_regdomain *rd)
3048 ret = __regulatory_set_wiphy_regd(wiphy, rd);
3052 /* process the request immediately */
3053 reg_process_self_managed_hints();
3056 EXPORT_SYMBOL(regulatory_set_wiphy_regd_sync_rtnl);
3058 void wiphy_regulatory_register(struct wiphy *wiphy)
3060 struct regulatory_request *lr;
3062 /* self-managed devices ignore external hints */
3063 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
3064 wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS |
3065 REGULATORY_COUNTRY_IE_IGNORE;
3067 if (!reg_dev_ignore_cell_hint(wiphy))
3068 reg_num_devs_support_basehint++;
3070 lr = get_last_request();
3071 wiphy_update_regulatory(wiphy, lr->initiator);
3074 void wiphy_regulatory_deregister(struct wiphy *wiphy)
3076 struct wiphy *request_wiphy = NULL;
3077 struct regulatory_request *lr;
3079 lr = get_last_request();
3081 if (!reg_dev_ignore_cell_hint(wiphy))
3082 reg_num_devs_support_basehint--;
3084 rcu_free_regdom(get_wiphy_regdom(wiphy));
3085 RCU_INIT_POINTER(wiphy->regd, NULL);
3088 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
3090 if (!request_wiphy || request_wiphy != wiphy)
3093 lr->wiphy_idx = WIPHY_IDX_INVALID;
3094 lr->country_ie_env = ENVIRON_ANY;
3098 * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for
3099 * UNII band definitions
3101 int cfg80211_get_unii(int freq)
3104 if (freq >= 5150 && freq <= 5250)
3108 if (freq > 5250 && freq <= 5350)
3112 if (freq > 5350 && freq <= 5470)
3116 if (freq > 5470 && freq <= 5725)
3120 if (freq > 5725 && freq <= 5825)
3126 bool regulatory_indoor_allowed(void)
3128 return reg_is_indoor;
3131 int __init regulatory_init(void)
3135 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
3136 if (IS_ERR(reg_pdev))
3137 return PTR_ERR(reg_pdev);
3139 spin_lock_init(®_requests_lock);
3140 spin_lock_init(®_pending_beacons_lock);
3141 spin_lock_init(®_indoor_lock);
3143 reg_regdb_size_check();
3145 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
3147 user_alpha2[0] = '9';
3148 user_alpha2[1] = '7';
3150 /* We always try to get an update for the static regdomain */
3151 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
3153 if (err == -ENOMEM) {
3154 platform_device_unregister(reg_pdev);
3158 * N.B. kobject_uevent_env() can fail mainly for when we're out
3159 * memory which is handled and propagated appropriately above
3160 * but it can also fail during a netlink_broadcast() or during
3161 * early boot for call_usermodehelper(). For now treat these
3162 * errors as non-fatal.
3164 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
3168 * Finally, if the user set the module parameter treat it
3171 if (!is_world_regdom(ieee80211_regdom))
3172 regulatory_hint_user(ieee80211_regdom,
3173 NL80211_USER_REG_HINT_USER);
3178 void regulatory_exit(void)
3180 struct regulatory_request *reg_request, *tmp;
3181 struct reg_beacon *reg_beacon, *btmp;
3183 cancel_work_sync(®_work);
3184 cancel_crda_timeout_sync();
3185 cancel_delayed_work_sync(®_check_chans);
3187 /* Lock to suppress warnings */
3189 reset_regdomains(true, NULL);
3192 dev_set_uevent_suppress(®_pdev->dev, true);
3194 platform_device_unregister(reg_pdev);
3196 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
3197 list_del(®_beacon->list);
3201 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
3202 list_del(®_beacon->list);
3206 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
3207 list_del(®_request->list);