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
7 * Copyright 2017 Intel Deutschland GmbH
8 * Copyright (C) 2018 - 2019 Intel Corporation
10 * Permission to use, copy, modify, and/or distribute this software for any
11 * purpose with or without fee is hereby granted, provided that the above
12 * copyright notice and this permission notice appear in all copies.
14 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
15 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
16 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
17 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
25 * DOC: Wireless regulatory infrastructure
27 * The usual implementation is for a driver to read a device EEPROM to
28 * determine which regulatory domain it should be operating under, then
29 * looking up the allowable channels in a driver-local table and finally
30 * registering those channels in the wiphy structure.
32 * Another set of compliance enforcement is for drivers to use their
33 * own compliance limits which can be stored on the EEPROM. The host
34 * driver or firmware may ensure these are used.
36 * In addition to all this we provide an extra layer of regulatory
37 * conformance. For drivers which do not have any regulatory
38 * information CRDA provides the complete regulatory solution.
39 * For others it provides a community effort on further restrictions
40 * to enhance compliance.
42 * Note: When number of rules --> infinity we will not be able to
43 * index on alpha2 any more, instead we'll probably have to
44 * rely on some SHA1 checksum of the regdomain for example.
48 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
50 #include <linux/kernel.h>
51 #include <linux/export.h>
52 #include <linux/slab.h>
53 #include <linux/list.h>
54 #include <linux/ctype.h>
55 #include <linux/nl80211.h>
56 #include <linux/platform_device.h>
57 #include <linux/verification.h>
58 #include <linux/moduleparam.h>
59 #include <linux/firmware.h>
60 #include <net/cfg80211.h>
67 * Grace period we give before making sure all current interfaces reside on
68 * channels allowed by the current regulatory domain.
70 #define REG_ENFORCE_GRACE_MS 60000
73 * enum reg_request_treatment - regulatory request treatment
75 * @REG_REQ_OK: continue processing the regulatory request
76 * @REG_REQ_IGNORE: ignore the regulatory request
77 * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should
78 * be intersected with the current one.
79 * @REG_REQ_ALREADY_SET: the regulatory request will not change the current
80 * regulatory settings, and no further processing is required.
82 enum reg_request_treatment {
89 static struct regulatory_request core_request_world = {
90 .initiator = NL80211_REGDOM_SET_BY_CORE,
95 .country_ie_env = ENVIRON_ANY,
99 * Receipt of information from last regulatory request,
100 * protected by RTNL (and can be accessed with RCU protection)
102 static struct regulatory_request __rcu *last_request =
103 (void __force __rcu *)&core_request_world;
105 /* To trigger userspace events and load firmware */
106 static struct platform_device *reg_pdev;
109 * Central wireless core regulatory domains, we only need two,
110 * the current one and a world regulatory domain in case we have no
111 * information to give us an alpha2.
112 * (protected by RTNL, can be read under RCU)
114 const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
117 * Number of devices that registered to the core
118 * that support cellular base station regulatory hints
119 * (protected by RTNL)
121 static int reg_num_devs_support_basehint;
124 * State variable indicating if the platform on which the devices
125 * are attached is operating in an indoor environment. The state variable
126 * is relevant for all registered devices.
128 static bool reg_is_indoor;
129 static spinlock_t reg_indoor_lock;
131 /* Used to track the userspace process controlling the indoor setting */
132 static u32 reg_is_indoor_portid;
134 static void restore_regulatory_settings(bool reset_user, bool cached);
135 static void print_regdomain(const struct ieee80211_regdomain *rd);
137 static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
139 return rcu_dereference_rtnl(cfg80211_regdomain);
142 const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
144 return rcu_dereference_rtnl(wiphy->regd);
147 static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region)
149 switch (dfs_region) {
150 case NL80211_DFS_UNSET:
152 case NL80211_DFS_FCC:
154 case NL80211_DFS_ETSI:
162 enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy)
164 const struct ieee80211_regdomain *regd = NULL;
165 const struct ieee80211_regdomain *wiphy_regd = NULL;
167 regd = get_cfg80211_regdom();
171 wiphy_regd = get_wiphy_regdom(wiphy);
175 if (wiphy_regd->dfs_region == regd->dfs_region)
178 pr_debug("%s: device specific dfs_region (%s) disagrees with cfg80211's central dfs_region (%s)\n",
179 dev_name(&wiphy->dev),
180 reg_dfs_region_str(wiphy_regd->dfs_region),
181 reg_dfs_region_str(regd->dfs_region));
184 return regd->dfs_region;
187 static void rcu_free_regdom(const struct ieee80211_regdomain *r)
191 kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
194 static struct regulatory_request *get_last_request(void)
196 return rcu_dereference_rtnl(last_request);
199 /* Used to queue up regulatory hints */
200 static LIST_HEAD(reg_requests_list);
201 static spinlock_t reg_requests_lock;
203 /* Used to queue up beacon hints for review */
204 static LIST_HEAD(reg_pending_beacons);
205 static spinlock_t reg_pending_beacons_lock;
207 /* Used to keep track of processed beacon hints */
208 static LIST_HEAD(reg_beacon_list);
211 struct list_head list;
212 struct ieee80211_channel chan;
215 static void reg_check_chans_work(struct work_struct *work);
216 static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work);
218 static void reg_todo(struct work_struct *work);
219 static DECLARE_WORK(reg_work, reg_todo);
221 /* We keep a static world regulatory domain in case of the absence of CRDA */
222 static const struct ieee80211_regdomain world_regdom = {
226 /* IEEE 802.11b/g, channels 1..11 */
227 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
228 /* IEEE 802.11b/g, channels 12..13. */
229 REG_RULE(2467-10, 2472+10, 20, 6, 20,
230 NL80211_RRF_NO_IR | NL80211_RRF_AUTO_BW),
231 /* IEEE 802.11 channel 14 - Only JP enables
232 * this and for 802.11b only */
233 REG_RULE(2484-10, 2484+10, 20, 6, 20,
235 NL80211_RRF_NO_OFDM),
236 /* IEEE 802.11a, channel 36..48 */
237 REG_RULE(5180-10, 5240+10, 80, 6, 20,
239 NL80211_RRF_AUTO_BW),
241 /* IEEE 802.11a, channel 52..64 - DFS required */
242 REG_RULE(5260-10, 5320+10, 80, 6, 20,
244 NL80211_RRF_AUTO_BW |
247 /* IEEE 802.11a, channel 100..144 - DFS required */
248 REG_RULE(5500-10, 5720+10, 160, 6, 20,
252 /* IEEE 802.11a, channel 149..165 */
253 REG_RULE(5745-10, 5825+10, 80, 6, 20,
256 /* IEEE 802.11ad (60GHz), channels 1..3 */
257 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
261 /* protected by RTNL */
262 static const struct ieee80211_regdomain *cfg80211_world_regdom =
265 static char *ieee80211_regdom = "00";
266 static char user_alpha2[2];
267 static const struct ieee80211_regdomain *cfg80211_user_regdom;
269 module_param(ieee80211_regdom, charp, 0444);
270 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
272 static void reg_free_request(struct regulatory_request *request)
274 if (request == &core_request_world)
277 if (request != get_last_request())
281 static void reg_free_last_request(void)
283 struct regulatory_request *lr = get_last_request();
285 if (lr != &core_request_world && lr)
286 kfree_rcu(lr, rcu_head);
289 static void reg_update_last_request(struct regulatory_request *request)
291 struct regulatory_request *lr;
293 lr = get_last_request();
297 reg_free_last_request();
298 rcu_assign_pointer(last_request, request);
301 static void reset_regdomains(bool full_reset,
302 const struct ieee80211_regdomain *new_regdom)
304 const struct ieee80211_regdomain *r;
308 r = get_cfg80211_regdom();
310 /* avoid freeing static information or freeing something twice */
311 if (r == cfg80211_world_regdom)
313 if (cfg80211_world_regdom == &world_regdom)
314 cfg80211_world_regdom = NULL;
315 if (r == &world_regdom)
319 rcu_free_regdom(cfg80211_world_regdom);
321 cfg80211_world_regdom = &world_regdom;
322 rcu_assign_pointer(cfg80211_regdomain, new_regdom);
327 reg_update_last_request(&core_request_world);
331 * Dynamic world regulatory domain requested by the wireless
332 * core upon initialization
334 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
336 struct regulatory_request *lr;
338 lr = get_last_request();
342 reset_regdomains(false, rd);
344 cfg80211_world_regdom = rd;
347 bool is_world_regdom(const char *alpha2)
351 return alpha2[0] == '0' && alpha2[1] == '0';
354 static bool is_alpha2_set(const char *alpha2)
358 return alpha2[0] && alpha2[1];
361 static bool is_unknown_alpha2(const char *alpha2)
366 * Special case where regulatory domain was built by driver
367 * but a specific alpha2 cannot be determined
369 return alpha2[0] == '9' && alpha2[1] == '9';
372 static bool is_intersected_alpha2(const char *alpha2)
377 * Special case where regulatory domain is the
378 * result of an intersection between two regulatory domain
381 return alpha2[0] == '9' && alpha2[1] == '8';
384 static bool is_an_alpha2(const char *alpha2)
388 return isalpha(alpha2[0]) && isalpha(alpha2[1]);
391 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
393 if (!alpha2_x || !alpha2_y)
395 return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
398 static bool regdom_changes(const char *alpha2)
400 const struct ieee80211_regdomain *r = get_cfg80211_regdom();
404 return !alpha2_equal(r->alpha2, alpha2);
408 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
409 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
410 * has ever been issued.
412 static bool is_user_regdom_saved(void)
414 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
417 /* This would indicate a mistake on the design */
418 if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
419 "Unexpected user alpha2: %c%c\n",
420 user_alpha2[0], user_alpha2[1]))
426 static const struct ieee80211_regdomain *
427 reg_copy_regd(const struct ieee80211_regdomain *src_regd)
429 struct ieee80211_regdomain *regd;
432 regd = kzalloc(struct_size(regd, reg_rules, src_regd->n_reg_rules),
435 return ERR_PTR(-ENOMEM);
437 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
439 for (i = 0; i < src_regd->n_reg_rules; i++)
440 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
441 sizeof(struct ieee80211_reg_rule));
446 static void cfg80211_save_user_regdom(const struct ieee80211_regdomain *rd)
450 if (!IS_ERR(cfg80211_user_regdom))
451 kfree(cfg80211_user_regdom);
452 cfg80211_user_regdom = reg_copy_regd(rd);
455 struct reg_regdb_apply_request {
456 struct list_head list;
457 const struct ieee80211_regdomain *regdom;
460 static LIST_HEAD(reg_regdb_apply_list);
461 static DEFINE_MUTEX(reg_regdb_apply_mutex);
463 static void reg_regdb_apply(struct work_struct *work)
465 struct reg_regdb_apply_request *request;
469 mutex_lock(®_regdb_apply_mutex);
470 while (!list_empty(®_regdb_apply_list)) {
471 request = list_first_entry(®_regdb_apply_list,
472 struct reg_regdb_apply_request,
474 list_del(&request->list);
476 set_regdom(request->regdom, REGD_SOURCE_INTERNAL_DB);
479 mutex_unlock(®_regdb_apply_mutex);
484 static DECLARE_WORK(reg_regdb_work, reg_regdb_apply);
486 static int reg_schedule_apply(const struct ieee80211_regdomain *regdom)
488 struct reg_regdb_apply_request *request;
490 request = kzalloc(sizeof(struct reg_regdb_apply_request), GFP_KERNEL);
496 request->regdom = regdom;
498 mutex_lock(®_regdb_apply_mutex);
499 list_add_tail(&request->list, ®_regdb_apply_list);
500 mutex_unlock(®_regdb_apply_mutex);
502 schedule_work(®_regdb_work);
506 #ifdef CONFIG_CFG80211_CRDA_SUPPORT
507 /* Max number of consecutive attempts to communicate with CRDA */
508 #define REG_MAX_CRDA_TIMEOUTS 10
510 static u32 reg_crda_timeouts;
512 static void crda_timeout_work(struct work_struct *work);
513 static DECLARE_DELAYED_WORK(crda_timeout, crda_timeout_work);
515 static void crda_timeout_work(struct work_struct *work)
517 pr_debug("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
520 restore_regulatory_settings(true, false);
524 static void cancel_crda_timeout(void)
526 cancel_delayed_work(&crda_timeout);
529 static void cancel_crda_timeout_sync(void)
531 cancel_delayed_work_sync(&crda_timeout);
534 static void reset_crda_timeouts(void)
536 reg_crda_timeouts = 0;
540 * This lets us keep regulatory code which is updated on a regulatory
541 * basis in userspace.
543 static int call_crda(const char *alpha2)
546 char *env[] = { country, NULL };
549 snprintf(country, sizeof(country), "COUNTRY=%c%c",
550 alpha2[0], alpha2[1]);
552 if (reg_crda_timeouts > REG_MAX_CRDA_TIMEOUTS) {
553 pr_debug("Exceeded CRDA call max attempts. Not calling CRDA\n");
557 if (!is_world_regdom((char *) alpha2))
558 pr_debug("Calling CRDA for country: %c%c\n",
559 alpha2[0], alpha2[1]);
561 pr_debug("Calling CRDA to update world regulatory domain\n");
563 ret = kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, env);
567 queue_delayed_work(system_power_efficient_wq,
568 &crda_timeout, msecs_to_jiffies(3142));
572 static inline void cancel_crda_timeout(void) {}
573 static inline void cancel_crda_timeout_sync(void) {}
574 static inline void reset_crda_timeouts(void) {}
575 static inline int call_crda(const char *alpha2)
579 #endif /* CONFIG_CFG80211_CRDA_SUPPORT */
581 /* code to directly load a firmware database through request_firmware */
582 static const struct fwdb_header *regdb;
584 struct fwdb_country {
587 /* this struct cannot be extended */
588 } __packed __aligned(4);
590 struct fwdb_collection {
594 /* no optional data yet */
595 /* aligned to 2, then followed by __be16 array of rule pointers */
596 } __packed __aligned(4);
599 FWDB_FLAG_NO_OFDM = BIT(0),
600 FWDB_FLAG_NO_OUTDOOR = BIT(1),
601 FWDB_FLAG_DFS = BIT(2),
602 FWDB_FLAG_NO_IR = BIT(3),
603 FWDB_FLAG_AUTO_BW = BIT(4),
612 struct fwdb_wmm_rule {
613 struct fwdb_wmm_ac client[IEEE80211_NUM_ACS];
614 struct fwdb_wmm_ac ap[IEEE80211_NUM_ACS];
621 __be32 start, end, max_bw;
622 /* start of optional data */
625 } __packed __aligned(4);
627 #define FWDB_MAGIC 0x52474442
628 #define FWDB_VERSION 20
633 struct fwdb_country country[];
634 } __packed __aligned(4);
636 static int ecw2cw(int ecw)
638 return (1 << ecw) - 1;
641 static bool valid_wmm(struct fwdb_wmm_rule *rule)
643 struct fwdb_wmm_ac *ac = (struct fwdb_wmm_ac *)rule;
646 for (i = 0; i < IEEE80211_NUM_ACS * 2; i++) {
647 u16 cw_min = ecw2cw((ac[i].ecw & 0xf0) >> 4);
648 u16 cw_max = ecw2cw(ac[i].ecw & 0x0f);
649 u8 aifsn = ac[i].aifsn;
651 if (cw_min >= cw_max)
661 static bool valid_rule(const u8 *data, unsigned int size, u16 rule_ptr)
663 struct fwdb_rule *rule = (void *)(data + (rule_ptr << 2));
665 if ((u8 *)rule + sizeof(rule->len) > data + size)
668 /* mandatory fields */
669 if (rule->len < offsetofend(struct fwdb_rule, max_bw))
671 if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr)) {
672 u32 wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
673 struct fwdb_wmm_rule *wmm;
675 if (wmm_ptr + sizeof(struct fwdb_wmm_rule) > size)
678 wmm = (void *)(data + wmm_ptr);
686 static bool valid_country(const u8 *data, unsigned int size,
687 const struct fwdb_country *country)
689 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
690 struct fwdb_collection *coll = (void *)(data + ptr);
694 /* make sure we can read len/n_rules */
695 if ((u8 *)coll + offsetofend(typeof(*coll), n_rules) > data + size)
698 /* make sure base struct and all rules fit */
699 if ((u8 *)coll + ALIGN(coll->len, 2) +
700 (coll->n_rules * 2) > data + size)
703 /* mandatory fields must exist */
704 if (coll->len < offsetofend(struct fwdb_collection, dfs_region))
707 rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
709 for (i = 0; i < coll->n_rules; i++) {
710 u16 rule_ptr = be16_to_cpu(rules_ptr[i]);
712 if (!valid_rule(data, size, rule_ptr))
719 #ifdef CONFIG_CFG80211_REQUIRE_SIGNED_REGDB
720 static struct key *builtin_regdb_keys;
722 static void __init load_keys_from_buffer(const u8 *p, unsigned int buflen)
724 const u8 *end = p + buflen;
729 /* Each cert begins with an ASN.1 SEQUENCE tag and must be more
730 * than 256 bytes in size.
737 plen = (p[2] << 8) | p[3];
742 key = key_create_or_update(make_key_ref(builtin_regdb_keys, 1),
743 "asymmetric", NULL, p, plen,
745 KEY_ALLOC_NOT_IN_QUOTA |
747 KEY_ALLOC_BYPASS_RESTRICTION);
749 pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
752 pr_notice("Loaded X.509 cert '%s'\n",
753 key_ref_to_ptr(key)->description);
762 pr_err("Problem parsing in-kernel X.509 certificate list\n");
765 static int __init load_builtin_regdb_keys(void)
768 keyring_alloc(".builtin_regdb_keys",
769 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
770 &internal_keyring_acl,
771 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
772 if (IS_ERR(builtin_regdb_keys))
773 return PTR_ERR(builtin_regdb_keys);
775 pr_notice("Loading compiled-in X.509 certificates for regulatory database\n");
777 #ifdef CONFIG_CFG80211_USE_KERNEL_REGDB_KEYS
778 load_keys_from_buffer(shipped_regdb_certs, shipped_regdb_certs_len);
780 #ifdef CONFIG_CFG80211_EXTRA_REGDB_KEYDIR
781 if (CONFIG_CFG80211_EXTRA_REGDB_KEYDIR[0] != '\0')
782 load_keys_from_buffer(extra_regdb_certs, extra_regdb_certs_len);
788 static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
790 const struct firmware *sig;
793 if (request_firmware(&sig, "regulatory.db.p7s", ®_pdev->dev))
796 result = verify_pkcs7_signature(data, size, sig->data, sig->size,
798 VERIFYING_UNSPECIFIED_SIGNATURE,
801 release_firmware(sig);
806 static void free_regdb_keyring(void)
808 key_put(builtin_regdb_keys);
811 static int load_builtin_regdb_keys(void)
816 static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
821 static void free_regdb_keyring(void)
824 #endif /* CONFIG_CFG80211_REQUIRE_SIGNED_REGDB */
826 static bool valid_regdb(const u8 *data, unsigned int size)
828 const struct fwdb_header *hdr = (void *)data;
829 const struct fwdb_country *country;
831 if (size < sizeof(*hdr))
834 if (hdr->magic != cpu_to_be32(FWDB_MAGIC))
837 if (hdr->version != cpu_to_be32(FWDB_VERSION))
840 if (!regdb_has_valid_signature(data, size))
843 country = &hdr->country[0];
844 while ((u8 *)(country + 1) <= data + size) {
845 if (!country->coll_ptr)
847 if (!valid_country(data, size, country))
855 static void set_wmm_rule(const struct fwdb_header *db,
856 const struct fwdb_country *country,
857 const struct fwdb_rule *rule,
858 struct ieee80211_reg_rule *rrule)
860 struct ieee80211_wmm_rule *wmm_rule = &rrule->wmm_rule;
861 struct fwdb_wmm_rule *wmm;
862 unsigned int i, wmm_ptr;
864 wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
865 wmm = (void *)((u8 *)db + wmm_ptr);
867 if (!valid_wmm(wmm)) {
868 pr_err("Invalid regulatory WMM rule %u-%u in domain %c%c\n",
869 be32_to_cpu(rule->start), be32_to_cpu(rule->end),
870 country->alpha2[0], country->alpha2[1]);
874 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
875 wmm_rule->client[i].cw_min =
876 ecw2cw((wmm->client[i].ecw & 0xf0) >> 4);
877 wmm_rule->client[i].cw_max = ecw2cw(wmm->client[i].ecw & 0x0f);
878 wmm_rule->client[i].aifsn = wmm->client[i].aifsn;
879 wmm_rule->client[i].cot =
880 1000 * be16_to_cpu(wmm->client[i].cot);
881 wmm_rule->ap[i].cw_min = ecw2cw((wmm->ap[i].ecw & 0xf0) >> 4);
882 wmm_rule->ap[i].cw_max = ecw2cw(wmm->ap[i].ecw & 0x0f);
883 wmm_rule->ap[i].aifsn = wmm->ap[i].aifsn;
884 wmm_rule->ap[i].cot = 1000 * be16_to_cpu(wmm->ap[i].cot);
887 rrule->has_wmm = true;
890 static int __regdb_query_wmm(const struct fwdb_header *db,
891 const struct fwdb_country *country, int freq,
892 struct ieee80211_reg_rule *rrule)
894 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
895 struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
898 for (i = 0; i < coll->n_rules; i++) {
899 __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
900 unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
901 struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
903 if (rule->len < offsetofend(struct fwdb_rule, wmm_ptr))
906 if (freq >= KHZ_TO_MHZ(be32_to_cpu(rule->start)) &&
907 freq <= KHZ_TO_MHZ(be32_to_cpu(rule->end))) {
908 set_wmm_rule(db, country, rule, rrule);
916 int reg_query_regdb_wmm(char *alpha2, int freq, struct ieee80211_reg_rule *rule)
918 const struct fwdb_header *hdr = regdb;
919 const struct fwdb_country *country;
925 return PTR_ERR(regdb);
927 country = &hdr->country[0];
928 while (country->coll_ptr) {
929 if (alpha2_equal(alpha2, country->alpha2))
930 return __regdb_query_wmm(regdb, country, freq, rule);
937 EXPORT_SYMBOL(reg_query_regdb_wmm);
939 static int regdb_query_country(const struct fwdb_header *db,
940 const struct fwdb_country *country)
942 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
943 struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
944 struct ieee80211_regdomain *regdom;
947 regdom = kzalloc(struct_size(regdom, reg_rules, coll->n_rules),
952 regdom->n_reg_rules = coll->n_rules;
953 regdom->alpha2[0] = country->alpha2[0];
954 regdom->alpha2[1] = country->alpha2[1];
955 regdom->dfs_region = coll->dfs_region;
957 for (i = 0; i < regdom->n_reg_rules; i++) {
958 __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
959 unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
960 struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
961 struct ieee80211_reg_rule *rrule = ®dom->reg_rules[i];
963 rrule->freq_range.start_freq_khz = be32_to_cpu(rule->start);
964 rrule->freq_range.end_freq_khz = be32_to_cpu(rule->end);
965 rrule->freq_range.max_bandwidth_khz = be32_to_cpu(rule->max_bw);
967 rrule->power_rule.max_antenna_gain = 0;
968 rrule->power_rule.max_eirp = be16_to_cpu(rule->max_eirp);
971 if (rule->flags & FWDB_FLAG_NO_OFDM)
972 rrule->flags |= NL80211_RRF_NO_OFDM;
973 if (rule->flags & FWDB_FLAG_NO_OUTDOOR)
974 rrule->flags |= NL80211_RRF_NO_OUTDOOR;
975 if (rule->flags & FWDB_FLAG_DFS)
976 rrule->flags |= NL80211_RRF_DFS;
977 if (rule->flags & FWDB_FLAG_NO_IR)
978 rrule->flags |= NL80211_RRF_NO_IR;
979 if (rule->flags & FWDB_FLAG_AUTO_BW)
980 rrule->flags |= NL80211_RRF_AUTO_BW;
982 rrule->dfs_cac_ms = 0;
984 /* handle optional data */
985 if (rule->len >= offsetofend(struct fwdb_rule, cac_timeout))
987 1000 * be16_to_cpu(rule->cac_timeout);
988 if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr))
989 set_wmm_rule(db, country, rule, rrule);
992 return reg_schedule_apply(regdom);
995 static int query_regdb(const char *alpha2)
997 const struct fwdb_header *hdr = regdb;
998 const struct fwdb_country *country;
1003 return PTR_ERR(regdb);
1005 country = &hdr->country[0];
1006 while (country->coll_ptr) {
1007 if (alpha2_equal(alpha2, country->alpha2))
1008 return regdb_query_country(regdb, country);
1015 static void regdb_fw_cb(const struct firmware *fw, void *context)
1018 bool restore = true;
1022 pr_info("failed to load regulatory.db\n");
1023 set_error = -ENODATA;
1024 } else if (!valid_regdb(fw->data, fw->size)) {
1025 pr_info("loaded regulatory.db is malformed or signature is missing/invalid\n");
1026 set_error = -EINVAL;
1030 if (regdb && !IS_ERR(regdb)) {
1031 /* negative case - a bug
1032 * positive case - can happen due to race in case of multiple cb's in
1033 * queue, due to usage of asynchronous callback
1035 * Either case, just restore and free new db.
1037 } else if (set_error) {
1038 regdb = ERR_PTR(set_error);
1040 db = kmemdup(fw->data, fw->size, GFP_KERNEL);
1043 restore = context && query_regdb(context);
1050 restore_regulatory_settings(true, false);
1056 release_firmware(fw);
1059 static int query_regdb_file(const char *alpha2)
1064 return query_regdb(alpha2);
1066 alpha2 = kmemdup(alpha2, 2, GFP_KERNEL);
1070 return request_firmware_nowait(THIS_MODULE, true, "regulatory.db",
1071 ®_pdev->dev, GFP_KERNEL,
1072 (void *)alpha2, regdb_fw_cb);
1075 int reg_reload_regdb(void)
1077 const struct firmware *fw;
1081 err = request_firmware(&fw, "regulatory.db", ®_pdev->dev);
1085 if (!valid_regdb(fw->data, fw->size)) {
1090 db = kmemdup(fw->data, fw->size, GFP_KERNEL);
1097 if (!IS_ERR_OR_NULL(regdb))
1103 release_firmware(fw);
1107 static bool reg_query_database(struct regulatory_request *request)
1109 if (query_regdb_file(request->alpha2) == 0)
1112 if (call_crda(request->alpha2) == 0)
1118 bool reg_is_valid_request(const char *alpha2)
1120 struct regulatory_request *lr = get_last_request();
1122 if (!lr || lr->processed)
1125 return alpha2_equal(lr->alpha2, alpha2);
1128 static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
1130 struct regulatory_request *lr = get_last_request();
1133 * Follow the driver's regulatory domain, if present, unless a country
1134 * IE has been processed or a user wants to help complaince further
1136 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1137 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
1139 return get_wiphy_regdom(wiphy);
1141 return get_cfg80211_regdom();
1145 reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd,
1146 const struct ieee80211_reg_rule *rule)
1148 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
1149 const struct ieee80211_freq_range *freq_range_tmp;
1150 const struct ieee80211_reg_rule *tmp;
1151 u32 start_freq, end_freq, idx, no;
1153 for (idx = 0; idx < rd->n_reg_rules; idx++)
1154 if (rule == &rd->reg_rules[idx])
1157 if (idx == rd->n_reg_rules)
1160 /* get start_freq */
1164 tmp = &rd->reg_rules[--no];
1165 freq_range_tmp = &tmp->freq_range;
1167 if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
1170 freq_range = freq_range_tmp;
1173 start_freq = freq_range->start_freq_khz;
1176 freq_range = &rule->freq_range;
1179 while (no < rd->n_reg_rules - 1) {
1180 tmp = &rd->reg_rules[++no];
1181 freq_range_tmp = &tmp->freq_range;
1183 if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
1186 freq_range = freq_range_tmp;
1189 end_freq = freq_range->end_freq_khz;
1191 return end_freq - start_freq;
1194 unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
1195 const struct ieee80211_reg_rule *rule)
1197 unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule);
1199 if (rule->flags & NL80211_RRF_NO_160MHZ)
1200 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80));
1201 if (rule->flags & NL80211_RRF_NO_80MHZ)
1202 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40));
1205 * HT40+/HT40- limits are handled per-channel. Only limit BW if both
1208 if (rule->flags & NL80211_RRF_NO_HT40MINUS &&
1209 rule->flags & NL80211_RRF_NO_HT40PLUS)
1210 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20));
1215 /* Sanity check on a regulatory rule */
1216 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
1218 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
1221 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
1224 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
1227 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
1229 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
1230 freq_range->max_bandwidth_khz > freq_diff)
1236 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
1238 const struct ieee80211_reg_rule *reg_rule = NULL;
1241 if (!rd->n_reg_rules)
1244 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
1247 for (i = 0; i < rd->n_reg_rules; i++) {
1248 reg_rule = &rd->reg_rules[i];
1249 if (!is_valid_reg_rule(reg_rule))
1257 * freq_in_rule_band - tells us if a frequency is in a frequency band
1258 * @freq_range: frequency rule we want to query
1259 * @freq_khz: frequency we are inquiring about
1261 * This lets us know if a specific frequency rule is or is not relevant to
1262 * a specific frequency's band. Bands are device specific and artificial
1263 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
1264 * however it is safe for now to assume that a frequency rule should not be
1265 * part of a frequency's band if the start freq or end freq are off by more
1266 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 20 GHz for the
1268 * This resolution can be lowered and should be considered as we add
1269 * regulatory rule support for other "bands".
1271 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
1274 #define ONE_GHZ_IN_KHZ 1000000
1276 * From 802.11ad: directional multi-gigabit (DMG):
1277 * Pertaining to operation in a frequency band containing a channel
1278 * with the Channel starting frequency above 45 GHz.
1280 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
1281 20 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
1282 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
1284 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
1287 #undef ONE_GHZ_IN_KHZ
1291 * Later on we can perhaps use the more restrictive DFS
1292 * region but we don't have information for that yet so
1293 * for now simply disallow conflicts.
1295 static enum nl80211_dfs_regions
1296 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
1297 const enum nl80211_dfs_regions dfs_region2)
1299 if (dfs_region1 != dfs_region2)
1300 return NL80211_DFS_UNSET;
1304 static void reg_wmm_rules_intersect(const struct ieee80211_wmm_ac *wmm_ac1,
1305 const struct ieee80211_wmm_ac *wmm_ac2,
1306 struct ieee80211_wmm_ac *intersect)
1308 intersect->cw_min = max_t(u16, wmm_ac1->cw_min, wmm_ac2->cw_min);
1309 intersect->cw_max = max_t(u16, wmm_ac1->cw_max, wmm_ac2->cw_max);
1310 intersect->cot = min_t(u16, wmm_ac1->cot, wmm_ac2->cot);
1311 intersect->aifsn = max_t(u8, wmm_ac1->aifsn, wmm_ac2->aifsn);
1315 * Helper for regdom_intersect(), this does the real
1316 * mathematical intersection fun
1318 static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
1319 const struct ieee80211_regdomain *rd2,
1320 const struct ieee80211_reg_rule *rule1,
1321 const struct ieee80211_reg_rule *rule2,
1322 struct ieee80211_reg_rule *intersected_rule)
1324 const struct ieee80211_freq_range *freq_range1, *freq_range2;
1325 struct ieee80211_freq_range *freq_range;
1326 const struct ieee80211_power_rule *power_rule1, *power_rule2;
1327 struct ieee80211_power_rule *power_rule;
1328 const struct ieee80211_wmm_rule *wmm_rule1, *wmm_rule2;
1329 struct ieee80211_wmm_rule *wmm_rule;
1330 u32 freq_diff, max_bandwidth1, max_bandwidth2;
1332 freq_range1 = &rule1->freq_range;
1333 freq_range2 = &rule2->freq_range;
1334 freq_range = &intersected_rule->freq_range;
1336 power_rule1 = &rule1->power_rule;
1337 power_rule2 = &rule2->power_rule;
1338 power_rule = &intersected_rule->power_rule;
1340 wmm_rule1 = &rule1->wmm_rule;
1341 wmm_rule2 = &rule2->wmm_rule;
1342 wmm_rule = &intersected_rule->wmm_rule;
1344 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
1345 freq_range2->start_freq_khz);
1346 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
1347 freq_range2->end_freq_khz);
1349 max_bandwidth1 = freq_range1->max_bandwidth_khz;
1350 max_bandwidth2 = freq_range2->max_bandwidth_khz;
1352 if (rule1->flags & NL80211_RRF_AUTO_BW)
1353 max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
1354 if (rule2->flags & NL80211_RRF_AUTO_BW)
1355 max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
1357 freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
1359 intersected_rule->flags = rule1->flags | rule2->flags;
1362 * In case NL80211_RRF_AUTO_BW requested for both rules
1363 * set AUTO_BW in intersected rule also. Next we will
1364 * calculate BW correctly in handle_channel function.
1365 * In other case remove AUTO_BW flag while we calculate
1366 * maximum bandwidth correctly and auto calculation is
1369 if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
1370 (rule2->flags & NL80211_RRF_AUTO_BW))
1371 intersected_rule->flags |= NL80211_RRF_AUTO_BW;
1373 intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
1375 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
1376 if (freq_range->max_bandwidth_khz > freq_diff)
1377 freq_range->max_bandwidth_khz = freq_diff;
1379 power_rule->max_eirp = min(power_rule1->max_eirp,
1380 power_rule2->max_eirp);
1381 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
1382 power_rule2->max_antenna_gain);
1384 intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms,
1387 if (rule1->has_wmm && rule2->has_wmm) {
1390 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1391 reg_wmm_rules_intersect(&wmm_rule1->client[ac],
1392 &wmm_rule2->client[ac],
1393 &wmm_rule->client[ac]);
1394 reg_wmm_rules_intersect(&wmm_rule1->ap[ac],
1399 intersected_rule->has_wmm = true;
1400 } else if (rule1->has_wmm) {
1401 *wmm_rule = *wmm_rule1;
1402 intersected_rule->has_wmm = true;
1403 } else if (rule2->has_wmm) {
1404 *wmm_rule = *wmm_rule2;
1405 intersected_rule->has_wmm = true;
1407 intersected_rule->has_wmm = false;
1410 if (!is_valid_reg_rule(intersected_rule))
1416 /* check whether old rule contains new rule */
1417 static bool rule_contains(struct ieee80211_reg_rule *r1,
1418 struct ieee80211_reg_rule *r2)
1420 /* for simplicity, currently consider only same flags */
1421 if (r1->flags != r2->flags)
1424 /* verify r1 is more restrictive */
1425 if ((r1->power_rule.max_antenna_gain >
1426 r2->power_rule.max_antenna_gain) ||
1427 r1->power_rule.max_eirp > r2->power_rule.max_eirp)
1430 /* make sure r2's range is contained within r1 */
1431 if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz ||
1432 r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz)
1435 /* and finally verify that r1.max_bw >= r2.max_bw */
1436 if (r1->freq_range.max_bandwidth_khz <
1437 r2->freq_range.max_bandwidth_khz)
1443 /* add or extend current rules. do nothing if rule is already contained */
1444 static void add_rule(struct ieee80211_reg_rule *rule,
1445 struct ieee80211_reg_rule *reg_rules, u32 *n_rules)
1447 struct ieee80211_reg_rule *tmp_rule;
1450 for (i = 0; i < *n_rules; i++) {
1451 tmp_rule = ®_rules[i];
1452 /* rule is already contained - do nothing */
1453 if (rule_contains(tmp_rule, rule))
1456 /* extend rule if possible */
1457 if (rule_contains(rule, tmp_rule)) {
1458 memcpy(tmp_rule, rule, sizeof(*rule));
1463 memcpy(®_rules[*n_rules], rule, sizeof(*rule));
1468 * regdom_intersect - do the intersection between two regulatory domains
1469 * @rd1: first regulatory domain
1470 * @rd2: second regulatory domain
1472 * Use this function to get the intersection between two regulatory domains.
1473 * Once completed we will mark the alpha2 for the rd as intersected, "98",
1474 * as no one single alpha2 can represent this regulatory domain.
1476 * Returns a pointer to the regulatory domain structure which will hold the
1477 * resulting intersection of rules between rd1 and rd2. We will
1478 * kzalloc() this structure for you.
1480 static struct ieee80211_regdomain *
1481 regdom_intersect(const struct ieee80211_regdomain *rd1,
1482 const struct ieee80211_regdomain *rd2)
1486 unsigned int num_rules = 0;
1487 const struct ieee80211_reg_rule *rule1, *rule2;
1488 struct ieee80211_reg_rule intersected_rule;
1489 struct ieee80211_regdomain *rd;
1495 * First we get a count of the rules we'll need, then we actually
1496 * build them. This is to so we can malloc() and free() a
1497 * regdomain once. The reason we use reg_rules_intersect() here
1498 * is it will return -EINVAL if the rule computed makes no sense.
1499 * All rules that do check out OK are valid.
1502 for (x = 0; x < rd1->n_reg_rules; x++) {
1503 rule1 = &rd1->reg_rules[x];
1504 for (y = 0; y < rd2->n_reg_rules; y++) {
1505 rule2 = &rd2->reg_rules[y];
1506 if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
1515 rd = kzalloc(struct_size(rd, reg_rules, num_rules), GFP_KERNEL);
1519 for (x = 0; x < rd1->n_reg_rules; x++) {
1520 rule1 = &rd1->reg_rules[x];
1521 for (y = 0; y < rd2->n_reg_rules; y++) {
1522 rule2 = &rd2->reg_rules[y];
1523 r = reg_rules_intersect(rd1, rd2, rule1, rule2,
1526 * No need to memset here the intersected rule here as
1527 * we're not using the stack anymore
1532 add_rule(&intersected_rule, rd->reg_rules,
1537 rd->alpha2[0] = '9';
1538 rd->alpha2[1] = '8';
1539 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
1546 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
1547 * want to just have the channel structure use these
1549 static u32 map_regdom_flags(u32 rd_flags)
1551 u32 channel_flags = 0;
1552 if (rd_flags & NL80211_RRF_NO_IR_ALL)
1553 channel_flags |= IEEE80211_CHAN_NO_IR;
1554 if (rd_flags & NL80211_RRF_DFS)
1555 channel_flags |= IEEE80211_CHAN_RADAR;
1556 if (rd_flags & NL80211_RRF_NO_OFDM)
1557 channel_flags |= IEEE80211_CHAN_NO_OFDM;
1558 if (rd_flags & NL80211_RRF_NO_OUTDOOR)
1559 channel_flags |= IEEE80211_CHAN_INDOOR_ONLY;
1560 if (rd_flags & NL80211_RRF_IR_CONCURRENT)
1561 channel_flags |= IEEE80211_CHAN_IR_CONCURRENT;
1562 if (rd_flags & NL80211_RRF_NO_HT40MINUS)
1563 channel_flags |= IEEE80211_CHAN_NO_HT40MINUS;
1564 if (rd_flags & NL80211_RRF_NO_HT40PLUS)
1565 channel_flags |= IEEE80211_CHAN_NO_HT40PLUS;
1566 if (rd_flags & NL80211_RRF_NO_80MHZ)
1567 channel_flags |= IEEE80211_CHAN_NO_80MHZ;
1568 if (rd_flags & NL80211_RRF_NO_160MHZ)
1569 channel_flags |= IEEE80211_CHAN_NO_160MHZ;
1570 return channel_flags;
1573 static const struct ieee80211_reg_rule *
1574 freq_reg_info_regd(u32 center_freq,
1575 const struct ieee80211_regdomain *regd, u32 bw)
1578 bool band_rule_found = false;
1579 bool bw_fits = false;
1582 return ERR_PTR(-EINVAL);
1584 for (i = 0; i < regd->n_reg_rules; i++) {
1585 const struct ieee80211_reg_rule *rr;
1586 const struct ieee80211_freq_range *fr = NULL;
1588 rr = ®d->reg_rules[i];
1589 fr = &rr->freq_range;
1592 * We only need to know if one frequency rule was
1593 * was in center_freq's band, that's enough, so lets
1594 * not overwrite it once found
1596 if (!band_rule_found)
1597 band_rule_found = freq_in_rule_band(fr, center_freq);
1599 bw_fits = cfg80211_does_bw_fit_range(fr, center_freq, bw);
1601 if (band_rule_found && bw_fits)
1605 if (!band_rule_found)
1606 return ERR_PTR(-ERANGE);
1608 return ERR_PTR(-EINVAL);
1611 static const struct ieee80211_reg_rule *
1612 __freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
1614 const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy);
1615 const struct ieee80211_reg_rule *reg_rule = NULL;
1618 for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
1619 reg_rule = freq_reg_info_regd(center_freq, regd, bw);
1620 if (!IS_ERR(reg_rule))
1627 const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
1630 return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(20));
1632 EXPORT_SYMBOL(freq_reg_info);
1634 const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
1636 switch (initiator) {
1637 case NL80211_REGDOM_SET_BY_CORE:
1639 case NL80211_REGDOM_SET_BY_USER:
1641 case NL80211_REGDOM_SET_BY_DRIVER:
1643 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1644 return "country element";
1650 EXPORT_SYMBOL(reg_initiator_name);
1652 static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd,
1653 const struct ieee80211_reg_rule *reg_rule,
1654 const struct ieee80211_channel *chan)
1656 const struct ieee80211_freq_range *freq_range = NULL;
1657 u32 max_bandwidth_khz, bw_flags = 0;
1659 freq_range = ®_rule->freq_range;
1661 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1662 /* Check if auto calculation requested */
1663 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
1664 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1666 /* If we get a reg_rule we can assume that at least 5Mhz fit */
1667 if (!cfg80211_does_bw_fit_range(freq_range,
1668 MHZ_TO_KHZ(chan->center_freq),
1670 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1671 if (!cfg80211_does_bw_fit_range(freq_range,
1672 MHZ_TO_KHZ(chan->center_freq),
1674 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1676 if (max_bandwidth_khz < MHZ_TO_KHZ(10))
1677 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1678 if (max_bandwidth_khz < MHZ_TO_KHZ(20))
1679 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1680 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1681 bw_flags |= IEEE80211_CHAN_NO_HT40;
1682 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1683 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1684 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1685 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1690 * Note that right now we assume the desired channel bandwidth
1691 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
1692 * per channel, the primary and the extension channel).
1694 static void handle_channel(struct wiphy *wiphy,
1695 enum nl80211_reg_initiator initiator,
1696 struct ieee80211_channel *chan)
1698 u32 flags, bw_flags = 0;
1699 const struct ieee80211_reg_rule *reg_rule = NULL;
1700 const struct ieee80211_power_rule *power_rule = NULL;
1701 struct wiphy *request_wiphy = NULL;
1702 struct regulatory_request *lr = get_last_request();
1703 const struct ieee80211_regdomain *regd;
1705 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1707 flags = chan->orig_flags;
1709 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
1710 if (IS_ERR(reg_rule)) {
1712 * We will disable all channels that do not match our
1713 * received regulatory rule unless the hint is coming
1714 * from a Country IE and the Country IE had no information
1715 * about a band. The IEEE 802.11 spec allows for an AP
1716 * to send only a subset of the regulatory rules allowed,
1717 * so an AP in the US that only supports 2.4 GHz may only send
1718 * a country IE with information for the 2.4 GHz band
1719 * while 5 GHz is still supported.
1721 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1722 PTR_ERR(reg_rule) == -ERANGE)
1725 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1726 request_wiphy && request_wiphy == wiphy &&
1727 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1728 pr_debug("Disabling freq %d MHz for good\n",
1730 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1731 chan->flags = chan->orig_flags;
1733 pr_debug("Disabling freq %d MHz\n",
1735 chan->flags |= IEEE80211_CHAN_DISABLED;
1740 regd = reg_get_regdomain(wiphy);
1742 power_rule = ®_rule->power_rule;
1743 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
1745 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1746 request_wiphy && request_wiphy == wiphy &&
1747 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1749 * This guarantees the driver's requested regulatory domain
1750 * will always be used as a base for further regulatory
1753 chan->flags = chan->orig_flags =
1754 map_regdom_flags(reg_rule->flags) | bw_flags;
1755 chan->max_antenna_gain = chan->orig_mag =
1756 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1757 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
1758 (int) MBM_TO_DBM(power_rule->max_eirp);
1760 if (chan->flags & IEEE80211_CHAN_RADAR) {
1761 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1762 if (reg_rule->dfs_cac_ms)
1763 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1769 chan->dfs_state = NL80211_DFS_USABLE;
1770 chan->dfs_state_entered = jiffies;
1772 chan->beacon_found = false;
1773 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1774 chan->max_antenna_gain =
1775 min_t(int, chan->orig_mag,
1776 MBI_TO_DBI(power_rule->max_antenna_gain));
1777 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1779 if (chan->flags & IEEE80211_CHAN_RADAR) {
1780 if (reg_rule->dfs_cac_ms)
1781 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1783 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1786 if (chan->orig_mpwr) {
1788 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1789 * will always follow the passed country IE power settings.
1791 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1792 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
1793 chan->max_power = chan->max_reg_power;
1795 chan->max_power = min(chan->orig_mpwr,
1796 chan->max_reg_power);
1798 chan->max_power = chan->max_reg_power;
1801 static void handle_band(struct wiphy *wiphy,
1802 enum nl80211_reg_initiator initiator,
1803 struct ieee80211_supported_band *sband)
1810 for (i = 0; i < sband->n_channels; i++)
1811 handle_channel(wiphy, initiator, &sband->channels[i]);
1814 static bool reg_request_cell_base(struct regulatory_request *request)
1816 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1818 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1821 bool reg_last_request_cell_base(void)
1823 return reg_request_cell_base(get_last_request());
1826 #ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
1827 /* Core specific check */
1828 static enum reg_request_treatment
1829 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1831 struct regulatory_request *lr = get_last_request();
1833 if (!reg_num_devs_support_basehint)
1834 return REG_REQ_IGNORE;
1836 if (reg_request_cell_base(lr) &&
1837 !regdom_changes(pending_request->alpha2))
1838 return REG_REQ_ALREADY_SET;
1843 /* Device specific check */
1844 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1846 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1849 static enum reg_request_treatment
1850 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1852 return REG_REQ_IGNORE;
1855 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1861 static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1863 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1864 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1869 static bool ignore_reg_update(struct wiphy *wiphy,
1870 enum nl80211_reg_initiator initiator)
1872 struct regulatory_request *lr = get_last_request();
1874 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
1878 pr_debug("Ignoring regulatory request set by %s since last_request is not set\n",
1879 reg_initiator_name(initiator));
1883 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1884 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1885 pr_debug("Ignoring regulatory request set by %s since the driver uses its own custom regulatory domain\n",
1886 reg_initiator_name(initiator));
1891 * wiphy->regd will be set once the device has its own
1892 * desired regulatory domain set
1894 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1895 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1896 !is_world_regdom(lr->alpha2)) {
1897 pr_debug("Ignoring regulatory request set by %s since the driver requires its own regulatory domain to be set first\n",
1898 reg_initiator_name(initiator));
1902 if (reg_request_cell_base(lr))
1903 return reg_dev_ignore_cell_hint(wiphy);
1908 static bool reg_is_world_roaming(struct wiphy *wiphy)
1910 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1911 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1912 struct regulatory_request *lr = get_last_request();
1914 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1917 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1918 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1924 static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1925 struct reg_beacon *reg_beacon)
1927 struct ieee80211_supported_band *sband;
1928 struct ieee80211_channel *chan;
1929 bool channel_changed = false;
1930 struct ieee80211_channel chan_before;
1932 sband = wiphy->bands[reg_beacon->chan.band];
1933 chan = &sband->channels[chan_idx];
1935 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1938 if (chan->beacon_found)
1941 chan->beacon_found = true;
1943 if (!reg_is_world_roaming(wiphy))
1946 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1949 chan_before = *chan;
1951 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1952 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1953 channel_changed = true;
1956 if (channel_changed)
1957 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1961 * Called when a scan on a wiphy finds a beacon on
1964 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1965 struct reg_beacon *reg_beacon)
1968 struct ieee80211_supported_band *sband;
1970 if (!wiphy->bands[reg_beacon->chan.band])
1973 sband = wiphy->bands[reg_beacon->chan.band];
1975 for (i = 0; i < sband->n_channels; i++)
1976 handle_reg_beacon(wiphy, i, reg_beacon);
1980 * Called upon reg changes or a new wiphy is added
1982 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1985 struct ieee80211_supported_band *sband;
1986 struct reg_beacon *reg_beacon;
1988 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1989 if (!wiphy->bands[reg_beacon->chan.band])
1991 sband = wiphy->bands[reg_beacon->chan.band];
1992 for (i = 0; i < sband->n_channels; i++)
1993 handle_reg_beacon(wiphy, i, reg_beacon);
1997 /* Reap the advantages of previously found beacons */
1998 static void reg_process_beacons(struct wiphy *wiphy)
2001 * Means we are just firing up cfg80211, so no beacons would
2002 * have been processed yet.
2006 wiphy_update_beacon_reg(wiphy);
2009 static bool is_ht40_allowed(struct ieee80211_channel *chan)
2013 if (chan->flags & IEEE80211_CHAN_DISABLED)
2015 /* This would happen when regulatory rules disallow HT40 completely */
2016 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
2021 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
2022 struct ieee80211_channel *channel)
2024 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
2025 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
2026 const struct ieee80211_regdomain *regd;
2030 if (!is_ht40_allowed(channel)) {
2031 channel->flags |= IEEE80211_CHAN_NO_HT40;
2036 * We need to ensure the extension channels exist to
2037 * be able to use HT40- or HT40+, this finds them (or not)
2039 for (i = 0; i < sband->n_channels; i++) {
2040 struct ieee80211_channel *c = &sband->channels[i];
2042 if (c->center_freq == (channel->center_freq - 20))
2044 if (c->center_freq == (channel->center_freq + 20))
2049 regd = get_wiphy_regdom(wiphy);
2051 const struct ieee80211_reg_rule *reg_rule =
2052 freq_reg_info_regd(MHZ_TO_KHZ(channel->center_freq),
2053 regd, MHZ_TO_KHZ(20));
2055 if (!IS_ERR(reg_rule))
2056 flags = reg_rule->flags;
2060 * Please note that this assumes target bandwidth is 20 MHz,
2061 * if that ever changes we also need to change the below logic
2062 * to include that as well.
2064 if (!is_ht40_allowed(channel_before) ||
2065 flags & NL80211_RRF_NO_HT40MINUS)
2066 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
2068 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
2070 if (!is_ht40_allowed(channel_after) ||
2071 flags & NL80211_RRF_NO_HT40PLUS)
2072 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
2074 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
2077 static void reg_process_ht_flags_band(struct wiphy *wiphy,
2078 struct ieee80211_supported_band *sband)
2085 for (i = 0; i < sband->n_channels; i++)
2086 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
2089 static void reg_process_ht_flags(struct wiphy *wiphy)
2091 enum nl80211_band band;
2096 for (band = 0; band < NUM_NL80211_BANDS; band++)
2097 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
2100 static void reg_call_notifier(struct wiphy *wiphy,
2101 struct regulatory_request *request)
2103 if (wiphy->reg_notifier)
2104 wiphy->reg_notifier(wiphy, request);
2107 static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
2109 struct cfg80211_chan_def chandef;
2110 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2111 enum nl80211_iftype iftype;
2114 iftype = wdev->iftype;
2116 /* make sure the interface is active */
2117 if (!wdev->netdev || !netif_running(wdev->netdev))
2118 goto wdev_inactive_unlock;
2121 case NL80211_IFTYPE_AP:
2122 case NL80211_IFTYPE_P2P_GO:
2123 if (!wdev->beacon_interval)
2124 goto wdev_inactive_unlock;
2125 chandef = wdev->chandef;
2127 case NL80211_IFTYPE_ADHOC:
2128 if (!wdev->ssid_len)
2129 goto wdev_inactive_unlock;
2130 chandef = wdev->chandef;
2132 case NL80211_IFTYPE_STATION:
2133 case NL80211_IFTYPE_P2P_CLIENT:
2134 if (!wdev->current_bss ||
2135 !wdev->current_bss->pub.channel)
2136 goto wdev_inactive_unlock;
2138 if (!rdev->ops->get_channel ||
2139 rdev_get_channel(rdev, wdev, &chandef))
2140 cfg80211_chandef_create(&chandef,
2141 wdev->current_bss->pub.channel,
2142 NL80211_CHAN_NO_HT);
2144 case NL80211_IFTYPE_MONITOR:
2145 case NL80211_IFTYPE_AP_VLAN:
2146 case NL80211_IFTYPE_P2P_DEVICE:
2147 /* no enforcement required */
2150 /* others not implemented for now */
2158 case NL80211_IFTYPE_AP:
2159 case NL80211_IFTYPE_P2P_GO:
2160 case NL80211_IFTYPE_ADHOC:
2161 return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
2162 case NL80211_IFTYPE_STATION:
2163 case NL80211_IFTYPE_P2P_CLIENT:
2164 return cfg80211_chandef_usable(wiphy, &chandef,
2165 IEEE80211_CHAN_DISABLED);
2172 wdev_inactive_unlock:
2177 static void reg_leave_invalid_chans(struct wiphy *wiphy)
2179 struct wireless_dev *wdev;
2180 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2184 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
2185 if (!reg_wdev_chan_valid(wiphy, wdev))
2186 cfg80211_leave(rdev, wdev);
2189 static void reg_check_chans_work(struct work_struct *work)
2191 struct cfg80211_registered_device *rdev;
2193 pr_debug("Verifying active interfaces after reg change\n");
2196 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
2197 if (!(rdev->wiphy.regulatory_flags &
2198 REGULATORY_IGNORE_STALE_KICKOFF))
2199 reg_leave_invalid_chans(&rdev->wiphy);
2204 static void reg_check_channels(void)
2207 * Give usermode a chance to do something nicer (move to another
2208 * channel, orderly disconnection), before forcing a disconnection.
2210 mod_delayed_work(system_power_efficient_wq,
2212 msecs_to_jiffies(REG_ENFORCE_GRACE_MS));
2215 static void wiphy_update_regulatory(struct wiphy *wiphy,
2216 enum nl80211_reg_initiator initiator)
2218 enum nl80211_band band;
2219 struct regulatory_request *lr = get_last_request();
2221 if (ignore_reg_update(wiphy, initiator)) {
2223 * Regulatory updates set by CORE are ignored for custom
2224 * regulatory cards. Let us notify the changes to the driver,
2225 * as some drivers used this to restore its orig_* reg domain.
2227 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
2228 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG &&
2229 !(wiphy->regulatory_flags &
2230 REGULATORY_WIPHY_SELF_MANAGED))
2231 reg_call_notifier(wiphy, lr);
2235 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
2237 for (band = 0; band < NUM_NL80211_BANDS; band++)
2238 handle_band(wiphy, initiator, wiphy->bands[band]);
2240 reg_process_beacons(wiphy);
2241 reg_process_ht_flags(wiphy);
2242 reg_call_notifier(wiphy, lr);
2245 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
2247 struct cfg80211_registered_device *rdev;
2248 struct wiphy *wiphy;
2252 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2253 wiphy = &rdev->wiphy;
2254 wiphy_update_regulatory(wiphy, initiator);
2257 reg_check_channels();
2260 static void handle_channel_custom(struct wiphy *wiphy,
2261 struct ieee80211_channel *chan,
2262 const struct ieee80211_regdomain *regd)
2265 const struct ieee80211_reg_rule *reg_rule = NULL;
2266 const struct ieee80211_power_rule *power_rule = NULL;
2269 for (bw = MHZ_TO_KHZ(20); bw >= MHZ_TO_KHZ(5); bw = bw / 2) {
2270 reg_rule = freq_reg_info_regd(MHZ_TO_KHZ(chan->center_freq),
2272 if (!IS_ERR(reg_rule))
2276 if (IS_ERR(reg_rule)) {
2277 pr_debug("Disabling freq %d MHz as custom regd has no rule that fits it\n",
2279 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
2280 chan->flags |= IEEE80211_CHAN_DISABLED;
2282 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
2283 chan->flags = chan->orig_flags;
2288 power_rule = ®_rule->power_rule;
2289 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
2291 chan->dfs_state_entered = jiffies;
2292 chan->dfs_state = NL80211_DFS_USABLE;
2294 chan->beacon_found = false;
2296 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
2297 chan->flags = chan->orig_flags | bw_flags |
2298 map_regdom_flags(reg_rule->flags);
2300 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
2302 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
2303 chan->max_reg_power = chan->max_power =
2304 (int) MBM_TO_DBM(power_rule->max_eirp);
2306 if (chan->flags & IEEE80211_CHAN_RADAR) {
2307 if (reg_rule->dfs_cac_ms)
2308 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
2310 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
2313 chan->max_power = chan->max_reg_power;
2316 static void handle_band_custom(struct wiphy *wiphy,
2317 struct ieee80211_supported_band *sband,
2318 const struct ieee80211_regdomain *regd)
2325 for (i = 0; i < sband->n_channels; i++)
2326 handle_channel_custom(wiphy, &sband->channels[i], regd);
2329 /* Used by drivers prior to wiphy registration */
2330 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
2331 const struct ieee80211_regdomain *regd)
2333 enum nl80211_band band;
2334 unsigned int bands_set = 0;
2336 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
2337 "wiphy should have REGULATORY_CUSTOM_REG\n");
2338 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
2340 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2341 if (!wiphy->bands[band])
2343 handle_band_custom(wiphy, wiphy->bands[band], regd);
2348 * no point in calling this if it won't have any effect
2349 * on your device's supported bands.
2351 WARN_ON(!bands_set);
2353 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
2355 static void reg_set_request_processed(void)
2357 bool need_more_processing = false;
2358 struct regulatory_request *lr = get_last_request();
2360 lr->processed = true;
2362 spin_lock(®_requests_lock);
2363 if (!list_empty(®_requests_list))
2364 need_more_processing = true;
2365 spin_unlock(®_requests_lock);
2367 cancel_crda_timeout();
2369 if (need_more_processing)
2370 schedule_work(®_work);
2374 * reg_process_hint_core - process core regulatory requests
2375 * @pending_request: a pending core regulatory request
2377 * The wireless subsystem can use this function to process
2378 * a regulatory request issued by the regulatory core.
2380 static enum reg_request_treatment
2381 reg_process_hint_core(struct regulatory_request *core_request)
2383 if (reg_query_database(core_request)) {
2384 core_request->intersect = false;
2385 core_request->processed = false;
2386 reg_update_last_request(core_request);
2390 return REG_REQ_IGNORE;
2393 static enum reg_request_treatment
2394 __reg_process_hint_user(struct regulatory_request *user_request)
2396 struct regulatory_request *lr = get_last_request();
2398 if (reg_request_cell_base(user_request))
2399 return reg_ignore_cell_hint(user_request);
2401 if (reg_request_cell_base(lr))
2402 return REG_REQ_IGNORE;
2404 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
2405 return REG_REQ_INTERSECT;
2407 * If the user knows better the user should set the regdom
2408 * to their country before the IE is picked up
2410 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
2412 return REG_REQ_IGNORE;
2414 * Process user requests only after previous user/driver/core
2415 * requests have been processed
2417 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
2418 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2419 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
2420 regdom_changes(lr->alpha2))
2421 return REG_REQ_IGNORE;
2423 if (!regdom_changes(user_request->alpha2))
2424 return REG_REQ_ALREADY_SET;
2430 * reg_process_hint_user - process user regulatory requests
2431 * @user_request: a pending user regulatory request
2433 * The wireless subsystem can use this function to process
2434 * a regulatory request initiated by userspace.
2436 static enum reg_request_treatment
2437 reg_process_hint_user(struct regulatory_request *user_request)
2439 enum reg_request_treatment treatment;
2441 treatment = __reg_process_hint_user(user_request);
2442 if (treatment == REG_REQ_IGNORE ||
2443 treatment == REG_REQ_ALREADY_SET)
2444 return REG_REQ_IGNORE;
2446 user_request->intersect = treatment == REG_REQ_INTERSECT;
2447 user_request->processed = false;
2449 if (reg_query_database(user_request)) {
2450 reg_update_last_request(user_request);
2451 user_alpha2[0] = user_request->alpha2[0];
2452 user_alpha2[1] = user_request->alpha2[1];
2456 return REG_REQ_IGNORE;
2459 static enum reg_request_treatment
2460 __reg_process_hint_driver(struct regulatory_request *driver_request)
2462 struct regulatory_request *lr = get_last_request();
2464 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
2465 if (regdom_changes(driver_request->alpha2))
2467 return REG_REQ_ALREADY_SET;
2471 * This would happen if you unplug and plug your card
2472 * back in or if you add a new device for which the previously
2473 * loaded card also agrees on the regulatory domain.
2475 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
2476 !regdom_changes(driver_request->alpha2))
2477 return REG_REQ_ALREADY_SET;
2479 return REG_REQ_INTERSECT;
2483 * reg_process_hint_driver - process driver regulatory requests
2484 * @driver_request: a pending driver regulatory request
2486 * The wireless subsystem can use this function to process
2487 * a regulatory request issued by an 802.11 driver.
2489 * Returns one of the different reg request treatment values.
2491 static enum reg_request_treatment
2492 reg_process_hint_driver(struct wiphy *wiphy,
2493 struct regulatory_request *driver_request)
2495 const struct ieee80211_regdomain *regd, *tmp;
2496 enum reg_request_treatment treatment;
2498 treatment = __reg_process_hint_driver(driver_request);
2500 switch (treatment) {
2503 case REG_REQ_IGNORE:
2504 return REG_REQ_IGNORE;
2505 case REG_REQ_INTERSECT:
2506 case REG_REQ_ALREADY_SET:
2507 regd = reg_copy_regd(get_cfg80211_regdom());
2509 return REG_REQ_IGNORE;
2511 tmp = get_wiphy_regdom(wiphy);
2512 rcu_assign_pointer(wiphy->regd, regd);
2513 rcu_free_regdom(tmp);
2517 driver_request->intersect = treatment == REG_REQ_INTERSECT;
2518 driver_request->processed = false;
2521 * Since CRDA will not be called in this case as we already
2522 * have applied the requested regulatory domain before we just
2523 * inform userspace we have processed the request
2525 if (treatment == REG_REQ_ALREADY_SET) {
2526 nl80211_send_reg_change_event(driver_request);
2527 reg_update_last_request(driver_request);
2528 reg_set_request_processed();
2529 return REG_REQ_ALREADY_SET;
2532 if (reg_query_database(driver_request)) {
2533 reg_update_last_request(driver_request);
2537 return REG_REQ_IGNORE;
2540 static enum reg_request_treatment
2541 __reg_process_hint_country_ie(struct wiphy *wiphy,
2542 struct regulatory_request *country_ie_request)
2544 struct wiphy *last_wiphy = NULL;
2545 struct regulatory_request *lr = get_last_request();
2547 if (reg_request_cell_base(lr)) {
2548 /* Trust a Cell base station over the AP's country IE */
2549 if (regdom_changes(country_ie_request->alpha2))
2550 return REG_REQ_IGNORE;
2551 return REG_REQ_ALREADY_SET;
2553 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
2554 return REG_REQ_IGNORE;
2557 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
2560 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
2563 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2565 if (last_wiphy != wiphy) {
2567 * Two cards with two APs claiming different
2568 * Country IE alpha2s. We could
2569 * intersect them, but that seems unlikely
2570 * to be correct. Reject second one for now.
2572 if (regdom_changes(country_ie_request->alpha2))
2573 return REG_REQ_IGNORE;
2574 return REG_REQ_ALREADY_SET;
2577 if (regdom_changes(country_ie_request->alpha2))
2579 return REG_REQ_ALREADY_SET;
2583 * reg_process_hint_country_ie - process regulatory requests from country IEs
2584 * @country_ie_request: a regulatory request from a country IE
2586 * The wireless subsystem can use this function to process
2587 * a regulatory request issued by a country Information Element.
2589 * Returns one of the different reg request treatment values.
2591 static enum reg_request_treatment
2592 reg_process_hint_country_ie(struct wiphy *wiphy,
2593 struct regulatory_request *country_ie_request)
2595 enum reg_request_treatment treatment;
2597 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
2599 switch (treatment) {
2602 case REG_REQ_IGNORE:
2603 return REG_REQ_IGNORE;
2604 case REG_REQ_ALREADY_SET:
2605 reg_free_request(country_ie_request);
2606 return REG_REQ_ALREADY_SET;
2607 case REG_REQ_INTERSECT:
2609 * This doesn't happen yet, not sure we
2610 * ever want to support it for this case.
2612 WARN_ONCE(1, "Unexpected intersection for country elements");
2613 return REG_REQ_IGNORE;
2616 country_ie_request->intersect = false;
2617 country_ie_request->processed = false;
2619 if (reg_query_database(country_ie_request)) {
2620 reg_update_last_request(country_ie_request);
2624 return REG_REQ_IGNORE;
2627 bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2)
2629 const struct ieee80211_regdomain *wiphy1_regd = NULL;
2630 const struct ieee80211_regdomain *wiphy2_regd = NULL;
2631 const struct ieee80211_regdomain *cfg80211_regd = NULL;
2632 bool dfs_domain_same;
2636 cfg80211_regd = rcu_dereference(cfg80211_regdomain);
2637 wiphy1_regd = rcu_dereference(wiphy1->regd);
2639 wiphy1_regd = cfg80211_regd;
2641 wiphy2_regd = rcu_dereference(wiphy2->regd);
2643 wiphy2_regd = cfg80211_regd;
2645 dfs_domain_same = wiphy1_regd->dfs_region == wiphy2_regd->dfs_region;
2649 return dfs_domain_same;
2652 static void reg_copy_dfs_chan_state(struct ieee80211_channel *dst_chan,
2653 struct ieee80211_channel *src_chan)
2655 if (!(dst_chan->flags & IEEE80211_CHAN_RADAR) ||
2656 !(src_chan->flags & IEEE80211_CHAN_RADAR))
2659 if (dst_chan->flags & IEEE80211_CHAN_DISABLED ||
2660 src_chan->flags & IEEE80211_CHAN_DISABLED)
2663 if (src_chan->center_freq == dst_chan->center_freq &&
2664 dst_chan->dfs_state == NL80211_DFS_USABLE) {
2665 dst_chan->dfs_state = src_chan->dfs_state;
2666 dst_chan->dfs_state_entered = src_chan->dfs_state_entered;
2670 static void wiphy_share_dfs_chan_state(struct wiphy *dst_wiphy,
2671 struct wiphy *src_wiphy)
2673 struct ieee80211_supported_band *src_sband, *dst_sband;
2674 struct ieee80211_channel *src_chan, *dst_chan;
2677 if (!reg_dfs_domain_same(dst_wiphy, src_wiphy))
2680 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2681 dst_sband = dst_wiphy->bands[band];
2682 src_sband = src_wiphy->bands[band];
2683 if (!dst_sband || !src_sband)
2686 for (i = 0; i < dst_sband->n_channels; i++) {
2687 dst_chan = &dst_sband->channels[i];
2688 for (j = 0; j < src_sband->n_channels; j++) {
2689 src_chan = &src_sband->channels[j];
2690 reg_copy_dfs_chan_state(dst_chan, src_chan);
2696 static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy)
2698 struct cfg80211_registered_device *rdev;
2702 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2703 if (wiphy == &rdev->wiphy)
2705 wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy);
2709 /* This processes *all* regulatory hints */
2710 static void reg_process_hint(struct regulatory_request *reg_request)
2712 struct wiphy *wiphy = NULL;
2713 enum reg_request_treatment treatment;
2714 enum nl80211_reg_initiator initiator = reg_request->initiator;
2716 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
2717 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
2719 switch (initiator) {
2720 case NL80211_REGDOM_SET_BY_CORE:
2721 treatment = reg_process_hint_core(reg_request);
2723 case NL80211_REGDOM_SET_BY_USER:
2724 treatment = reg_process_hint_user(reg_request);
2726 case NL80211_REGDOM_SET_BY_DRIVER:
2729 treatment = reg_process_hint_driver(wiphy, reg_request);
2731 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2734 treatment = reg_process_hint_country_ie(wiphy, reg_request);
2737 WARN(1, "invalid initiator %d\n", initiator);
2741 if (treatment == REG_REQ_IGNORE)
2744 WARN(treatment != REG_REQ_OK && treatment != REG_REQ_ALREADY_SET,
2745 "unexpected treatment value %d\n", treatment);
2747 /* This is required so that the orig_* parameters are saved.
2748 * NOTE: treatment must be set for any case that reaches here!
2750 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
2751 wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
2752 wiphy_update_regulatory(wiphy, initiator);
2753 wiphy_all_share_dfs_chan_state(wiphy);
2754 reg_check_channels();
2760 reg_free_request(reg_request);
2763 static void notify_self_managed_wiphys(struct regulatory_request *request)
2765 struct cfg80211_registered_device *rdev;
2766 struct wiphy *wiphy;
2768 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2769 wiphy = &rdev->wiphy;
2770 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED &&
2771 request->initiator == NL80211_REGDOM_SET_BY_USER)
2772 reg_call_notifier(wiphy, request);
2777 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
2778 * Regulatory hints come on a first come first serve basis and we
2779 * must process each one atomically.
2781 static void reg_process_pending_hints(void)
2783 struct regulatory_request *reg_request, *lr;
2785 lr = get_last_request();
2787 /* When last_request->processed becomes true this will be rescheduled */
2788 if (lr && !lr->processed) {
2789 reg_process_hint(lr);
2793 spin_lock(®_requests_lock);
2795 if (list_empty(®_requests_list)) {
2796 spin_unlock(®_requests_lock);
2800 reg_request = list_first_entry(®_requests_list,
2801 struct regulatory_request,
2803 list_del_init(®_request->list);
2805 spin_unlock(®_requests_lock);
2807 notify_self_managed_wiphys(reg_request);
2809 reg_process_hint(reg_request);
2811 lr = get_last_request();
2813 spin_lock(®_requests_lock);
2814 if (!list_empty(®_requests_list) && lr && lr->processed)
2815 schedule_work(®_work);
2816 spin_unlock(®_requests_lock);
2819 /* Processes beacon hints -- this has nothing to do with country IEs */
2820 static void reg_process_pending_beacon_hints(void)
2822 struct cfg80211_registered_device *rdev;
2823 struct reg_beacon *pending_beacon, *tmp;
2825 /* This goes through the _pending_ beacon list */
2826 spin_lock_bh(®_pending_beacons_lock);
2828 list_for_each_entry_safe(pending_beacon, tmp,
2829 ®_pending_beacons, list) {
2830 list_del_init(&pending_beacon->list);
2832 /* Applies the beacon hint to current wiphys */
2833 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
2834 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
2836 /* Remembers the beacon hint for new wiphys or reg changes */
2837 list_add_tail(&pending_beacon->list, ®_beacon_list);
2840 spin_unlock_bh(®_pending_beacons_lock);
2843 static void reg_process_self_managed_hints(void)
2845 struct cfg80211_registered_device *rdev;
2846 struct wiphy *wiphy;
2847 const struct ieee80211_regdomain *tmp;
2848 const struct ieee80211_regdomain *regd;
2849 enum nl80211_band band;
2850 struct regulatory_request request = {};
2852 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2853 wiphy = &rdev->wiphy;
2855 spin_lock(®_requests_lock);
2856 regd = rdev->requested_regd;
2857 rdev->requested_regd = NULL;
2858 spin_unlock(®_requests_lock);
2863 tmp = get_wiphy_regdom(wiphy);
2864 rcu_assign_pointer(wiphy->regd, regd);
2865 rcu_free_regdom(tmp);
2867 for (band = 0; band < NUM_NL80211_BANDS; band++)
2868 handle_band_custom(wiphy, wiphy->bands[band], regd);
2870 reg_process_ht_flags(wiphy);
2872 request.wiphy_idx = get_wiphy_idx(wiphy);
2873 request.alpha2[0] = regd->alpha2[0];
2874 request.alpha2[1] = regd->alpha2[1];
2875 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
2877 nl80211_send_wiphy_reg_change_event(&request);
2880 reg_check_channels();
2883 static void reg_todo(struct work_struct *work)
2886 reg_process_pending_hints();
2887 reg_process_pending_beacon_hints();
2888 reg_process_self_managed_hints();
2892 static void queue_regulatory_request(struct regulatory_request *request)
2894 request->alpha2[0] = toupper(request->alpha2[0]);
2895 request->alpha2[1] = toupper(request->alpha2[1]);
2897 spin_lock(®_requests_lock);
2898 list_add_tail(&request->list, ®_requests_list);
2899 spin_unlock(®_requests_lock);
2901 schedule_work(®_work);
2905 * Core regulatory hint -- happens during cfg80211_init()
2906 * and when we restore regulatory settings.
2908 static int regulatory_hint_core(const char *alpha2)
2910 struct regulatory_request *request;
2912 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2916 request->alpha2[0] = alpha2[0];
2917 request->alpha2[1] = alpha2[1];
2918 request->initiator = NL80211_REGDOM_SET_BY_CORE;
2919 request->wiphy_idx = WIPHY_IDX_INVALID;
2921 queue_regulatory_request(request);
2927 int regulatory_hint_user(const char *alpha2,
2928 enum nl80211_user_reg_hint_type user_reg_hint_type)
2930 struct regulatory_request *request;
2932 if (WARN_ON(!alpha2))
2935 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2939 request->wiphy_idx = WIPHY_IDX_INVALID;
2940 request->alpha2[0] = alpha2[0];
2941 request->alpha2[1] = alpha2[1];
2942 request->initiator = NL80211_REGDOM_SET_BY_USER;
2943 request->user_reg_hint_type = user_reg_hint_type;
2945 /* Allow calling CRDA again */
2946 reset_crda_timeouts();
2948 queue_regulatory_request(request);
2953 int regulatory_hint_indoor(bool is_indoor, u32 portid)
2955 spin_lock(®_indoor_lock);
2957 /* It is possible that more than one user space process is trying to
2958 * configure the indoor setting. To handle such cases, clear the indoor
2959 * setting in case that some process does not think that the device
2960 * is operating in an indoor environment. In addition, if a user space
2961 * process indicates that it is controlling the indoor setting, save its
2962 * portid, i.e., make it the owner.
2964 reg_is_indoor = is_indoor;
2965 if (reg_is_indoor) {
2966 if (!reg_is_indoor_portid)
2967 reg_is_indoor_portid = portid;
2969 reg_is_indoor_portid = 0;
2972 spin_unlock(®_indoor_lock);
2975 reg_check_channels();
2980 void regulatory_netlink_notify(u32 portid)
2982 spin_lock(®_indoor_lock);
2984 if (reg_is_indoor_portid != portid) {
2985 spin_unlock(®_indoor_lock);
2989 reg_is_indoor = false;
2990 reg_is_indoor_portid = 0;
2992 spin_unlock(®_indoor_lock);
2994 reg_check_channels();
2998 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
3000 struct regulatory_request *request;
3002 if (WARN_ON(!alpha2 || !wiphy))
3005 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
3007 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
3011 request->wiphy_idx = get_wiphy_idx(wiphy);
3013 request->alpha2[0] = alpha2[0];
3014 request->alpha2[1] = alpha2[1];
3015 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
3017 /* Allow calling CRDA again */
3018 reset_crda_timeouts();
3020 queue_regulatory_request(request);
3024 EXPORT_SYMBOL(regulatory_hint);
3026 void regulatory_hint_country_ie(struct wiphy *wiphy, enum nl80211_band band,
3027 const u8 *country_ie, u8 country_ie_len)
3030 enum environment_cap env = ENVIRON_ANY;
3031 struct regulatory_request *request = NULL, *lr;
3033 /* IE len must be evenly divisible by 2 */
3034 if (country_ie_len & 0x01)
3037 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
3040 request = kzalloc(sizeof(*request), GFP_KERNEL);
3044 alpha2[0] = country_ie[0];
3045 alpha2[1] = country_ie[1];
3047 if (country_ie[2] == 'I')
3048 env = ENVIRON_INDOOR;
3049 else if (country_ie[2] == 'O')
3050 env = ENVIRON_OUTDOOR;
3053 lr = get_last_request();
3059 * We will run this only upon a successful connection on cfg80211.
3060 * We leave conflict resolution to the workqueue, where can hold
3063 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
3064 lr->wiphy_idx != WIPHY_IDX_INVALID)
3067 request->wiphy_idx = get_wiphy_idx(wiphy);
3068 request->alpha2[0] = alpha2[0];
3069 request->alpha2[1] = alpha2[1];
3070 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
3071 request->country_ie_env = env;
3073 /* Allow calling CRDA again */
3074 reset_crda_timeouts();
3076 queue_regulatory_request(request);
3083 static void restore_alpha2(char *alpha2, bool reset_user)
3085 /* indicates there is no alpha2 to consider for restoration */
3089 /* The user setting has precedence over the module parameter */
3090 if (is_user_regdom_saved()) {
3091 /* Unless we're asked to ignore it and reset it */
3093 pr_debug("Restoring regulatory settings including user preference\n");
3094 user_alpha2[0] = '9';
3095 user_alpha2[1] = '7';
3098 * If we're ignoring user settings, we still need to
3099 * check the module parameter to ensure we put things
3100 * back as they were for a full restore.
3102 if (!is_world_regdom(ieee80211_regdom)) {
3103 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
3104 ieee80211_regdom[0], ieee80211_regdom[1]);
3105 alpha2[0] = ieee80211_regdom[0];
3106 alpha2[1] = ieee80211_regdom[1];
3109 pr_debug("Restoring regulatory settings while preserving user preference for: %c%c\n",
3110 user_alpha2[0], user_alpha2[1]);
3111 alpha2[0] = user_alpha2[0];
3112 alpha2[1] = user_alpha2[1];
3114 } else if (!is_world_regdom(ieee80211_regdom)) {
3115 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
3116 ieee80211_regdom[0], ieee80211_regdom[1]);
3117 alpha2[0] = ieee80211_regdom[0];
3118 alpha2[1] = ieee80211_regdom[1];
3120 pr_debug("Restoring regulatory settings\n");
3123 static void restore_custom_reg_settings(struct wiphy *wiphy)
3125 struct ieee80211_supported_band *sband;
3126 enum nl80211_band band;
3127 struct ieee80211_channel *chan;
3130 for (band = 0; band < NUM_NL80211_BANDS; band++) {
3131 sband = wiphy->bands[band];
3134 for (i = 0; i < sband->n_channels; i++) {
3135 chan = &sband->channels[i];
3136 chan->flags = chan->orig_flags;
3137 chan->max_antenna_gain = chan->orig_mag;
3138 chan->max_power = chan->orig_mpwr;
3139 chan->beacon_found = false;
3145 * Restoring regulatory settings involves ingoring any
3146 * possibly stale country IE information and user regulatory
3147 * settings if so desired, this includes any beacon hints
3148 * learned as we could have traveled outside to another country
3149 * after disconnection. To restore regulatory settings we do
3150 * exactly what we did at bootup:
3152 * - send a core regulatory hint
3153 * - send a user regulatory hint if applicable
3155 * Device drivers that send a regulatory hint for a specific country
3156 * keep their own regulatory domain on wiphy->regd so that does does
3157 * not need to be remembered.
3159 static void restore_regulatory_settings(bool reset_user, bool cached)
3162 char world_alpha2[2];
3163 struct reg_beacon *reg_beacon, *btmp;
3164 LIST_HEAD(tmp_reg_req_list);
3165 struct cfg80211_registered_device *rdev;
3170 * Clear the indoor setting in case that it is not controlled by user
3171 * space, as otherwise there is no guarantee that the device is still
3172 * operating in an indoor environment.
3174 spin_lock(®_indoor_lock);
3175 if (reg_is_indoor && !reg_is_indoor_portid) {
3176 reg_is_indoor = false;
3177 reg_check_channels();
3179 spin_unlock(®_indoor_lock);
3181 reset_regdomains(true, &world_regdom);
3182 restore_alpha2(alpha2, reset_user);
3185 * If there's any pending requests we simply
3186 * stash them to a temporary pending queue and
3187 * add then after we've restored regulatory
3190 spin_lock(®_requests_lock);
3191 list_splice_tail_init(®_requests_list, &tmp_reg_req_list);
3192 spin_unlock(®_requests_lock);
3194 /* Clear beacon hints */
3195 spin_lock_bh(®_pending_beacons_lock);
3196 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
3197 list_del(®_beacon->list);
3200 spin_unlock_bh(®_pending_beacons_lock);
3202 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
3203 list_del(®_beacon->list);
3207 /* First restore to the basic regulatory settings */
3208 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
3209 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
3211 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
3212 if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
3214 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
3215 restore_custom_reg_settings(&rdev->wiphy);
3218 if (cached && (!is_an_alpha2(alpha2) ||
3219 !IS_ERR_OR_NULL(cfg80211_user_regdom))) {
3220 reset_regdomains(false, cfg80211_world_regdom);
3221 update_all_wiphy_regulatory(NL80211_REGDOM_SET_BY_CORE);
3222 print_regdomain(get_cfg80211_regdom());
3223 nl80211_send_reg_change_event(&core_request_world);
3224 reg_set_request_processed();
3226 if (is_an_alpha2(alpha2) &&
3227 !regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER)) {
3228 struct regulatory_request *ureq;
3230 spin_lock(®_requests_lock);
3231 ureq = list_last_entry(®_requests_list,
3232 struct regulatory_request,
3234 list_del(&ureq->list);
3235 spin_unlock(®_requests_lock);
3237 notify_self_managed_wiphys(ureq);
3238 reg_update_last_request(ureq);
3239 set_regdom(reg_copy_regd(cfg80211_user_regdom),
3240 REGD_SOURCE_CACHED);
3243 regulatory_hint_core(world_alpha2);
3246 * This restores the ieee80211_regdom module parameter
3247 * preference or the last user requested regulatory
3248 * settings, user regulatory settings takes precedence.
3250 if (is_an_alpha2(alpha2))
3251 regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER);
3254 spin_lock(®_requests_lock);
3255 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
3256 spin_unlock(®_requests_lock);
3258 pr_debug("Kicking the queue\n");
3260 schedule_work(®_work);
3263 static bool is_wiphy_all_set_reg_flag(enum ieee80211_regulatory_flags flag)
3265 struct cfg80211_registered_device *rdev;
3266 struct wireless_dev *wdev;
3268 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
3269 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
3271 if (!(wdev->wiphy->regulatory_flags & flag)) {
3282 void regulatory_hint_disconnect(void)
3284 /* Restore of regulatory settings is not required when wiphy(s)
3285 * ignore IE from connected access point but clearance of beacon hints
3286 * is required when wiphy(s) supports beacon hints.
3288 if (is_wiphy_all_set_reg_flag(REGULATORY_COUNTRY_IE_IGNORE)) {
3289 struct reg_beacon *reg_beacon, *btmp;
3291 if (is_wiphy_all_set_reg_flag(REGULATORY_DISABLE_BEACON_HINTS))
3294 spin_lock_bh(®_pending_beacons_lock);
3295 list_for_each_entry_safe(reg_beacon, btmp,
3296 ®_pending_beacons, list) {
3297 list_del(®_beacon->list);
3300 spin_unlock_bh(®_pending_beacons_lock);
3302 list_for_each_entry_safe(reg_beacon, btmp,
3303 ®_beacon_list, list) {
3304 list_del(®_beacon->list);
3311 pr_debug("All devices are disconnected, going to restore regulatory settings\n");
3312 restore_regulatory_settings(false, true);
3315 static bool freq_is_chan_12_13_14(u32 freq)
3317 if (freq == ieee80211_channel_to_frequency(12, NL80211_BAND_2GHZ) ||
3318 freq == ieee80211_channel_to_frequency(13, NL80211_BAND_2GHZ) ||
3319 freq == ieee80211_channel_to_frequency(14, NL80211_BAND_2GHZ))
3324 static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
3326 struct reg_beacon *pending_beacon;
3328 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
3329 if (beacon_chan->center_freq ==
3330 pending_beacon->chan.center_freq)
3335 int regulatory_hint_found_beacon(struct wiphy *wiphy,
3336 struct ieee80211_channel *beacon_chan,
3339 struct reg_beacon *reg_beacon;
3342 if (beacon_chan->beacon_found ||
3343 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
3344 (beacon_chan->band == NL80211_BAND_2GHZ &&
3345 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
3348 spin_lock_bh(®_pending_beacons_lock);
3349 processing = pending_reg_beacon(beacon_chan);
3350 spin_unlock_bh(®_pending_beacons_lock);
3355 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
3359 pr_debug("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
3360 beacon_chan->center_freq,
3361 ieee80211_frequency_to_channel(beacon_chan->center_freq),
3364 memcpy(®_beacon->chan, beacon_chan,
3365 sizeof(struct ieee80211_channel));
3368 * Since we can be called from BH or and non-BH context
3369 * we must use spin_lock_bh()
3371 spin_lock_bh(®_pending_beacons_lock);
3372 list_add_tail(®_beacon->list, ®_pending_beacons);
3373 spin_unlock_bh(®_pending_beacons_lock);
3375 schedule_work(®_work);
3380 static void print_rd_rules(const struct ieee80211_regdomain *rd)
3383 const struct ieee80211_reg_rule *reg_rule = NULL;
3384 const struct ieee80211_freq_range *freq_range = NULL;
3385 const struct ieee80211_power_rule *power_rule = NULL;
3386 char bw[32], cac_time[32];
3388 pr_debug(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
3390 for (i = 0; i < rd->n_reg_rules; i++) {
3391 reg_rule = &rd->reg_rules[i];
3392 freq_range = ®_rule->freq_range;
3393 power_rule = ®_rule->power_rule;
3395 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
3396 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
3397 freq_range->max_bandwidth_khz,
3398 reg_get_max_bandwidth(rd, reg_rule));
3400 snprintf(bw, sizeof(bw), "%d KHz",
3401 freq_range->max_bandwidth_khz);
3403 if (reg_rule->flags & NL80211_RRF_DFS)
3404 scnprintf(cac_time, sizeof(cac_time), "%u s",
3405 reg_rule->dfs_cac_ms/1000);
3407 scnprintf(cac_time, sizeof(cac_time), "N/A");
3411 * There may not be documentation for max antenna gain
3412 * in certain regions
3414 if (power_rule->max_antenna_gain)
3415 pr_debug(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
3416 freq_range->start_freq_khz,
3417 freq_range->end_freq_khz,
3419 power_rule->max_antenna_gain,
3420 power_rule->max_eirp,
3423 pr_debug(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
3424 freq_range->start_freq_khz,
3425 freq_range->end_freq_khz,
3427 power_rule->max_eirp,
3432 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
3434 switch (dfs_region) {
3435 case NL80211_DFS_UNSET:
3436 case NL80211_DFS_FCC:
3437 case NL80211_DFS_ETSI:
3438 case NL80211_DFS_JP:
3441 pr_debug("Ignoring unknown DFS master region: %d\n", dfs_region);
3446 static void print_regdomain(const struct ieee80211_regdomain *rd)
3448 struct regulatory_request *lr = get_last_request();
3450 if (is_intersected_alpha2(rd->alpha2)) {
3451 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
3452 struct cfg80211_registered_device *rdev;
3453 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
3455 pr_debug("Current regulatory domain updated by AP to: %c%c\n",
3456 rdev->country_ie_alpha2[0],
3457 rdev->country_ie_alpha2[1]);
3459 pr_debug("Current regulatory domain intersected:\n");
3461 pr_debug("Current regulatory domain intersected:\n");
3462 } else if (is_world_regdom(rd->alpha2)) {
3463 pr_debug("World regulatory domain updated:\n");
3465 if (is_unknown_alpha2(rd->alpha2))
3466 pr_debug("Regulatory domain changed to driver built-in settings (unknown country)\n");
3468 if (reg_request_cell_base(lr))
3469 pr_debug("Regulatory domain changed to country: %c%c by Cell Station\n",
3470 rd->alpha2[0], rd->alpha2[1]);
3472 pr_debug("Regulatory domain changed to country: %c%c\n",
3473 rd->alpha2[0], rd->alpha2[1]);
3477 pr_debug(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
3481 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
3483 pr_debug("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
3487 static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
3489 if (!is_world_regdom(rd->alpha2))
3491 update_world_regdomain(rd);
3495 static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
3496 struct regulatory_request *user_request)
3498 const struct ieee80211_regdomain *intersected_rd = NULL;
3500 if (!regdom_changes(rd->alpha2))
3503 if (!is_valid_rd(rd)) {
3504 pr_err("Invalid regulatory domain detected: %c%c\n",
3505 rd->alpha2[0], rd->alpha2[1]);
3506 print_regdomain_info(rd);
3510 if (!user_request->intersect) {
3511 reset_regdomains(false, rd);
3515 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
3516 if (!intersected_rd)
3521 reset_regdomains(false, intersected_rd);
3526 static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
3527 struct regulatory_request *driver_request)
3529 const struct ieee80211_regdomain *regd;
3530 const struct ieee80211_regdomain *intersected_rd = NULL;
3531 const struct ieee80211_regdomain *tmp;
3532 struct wiphy *request_wiphy;
3534 if (is_world_regdom(rd->alpha2))
3537 if (!regdom_changes(rd->alpha2))
3540 if (!is_valid_rd(rd)) {
3541 pr_err("Invalid regulatory domain detected: %c%c\n",
3542 rd->alpha2[0], rd->alpha2[1]);
3543 print_regdomain_info(rd);
3547 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
3551 if (!driver_request->intersect) {
3552 if (request_wiphy->regd)
3555 regd = reg_copy_regd(rd);
3557 return PTR_ERR(regd);
3559 rcu_assign_pointer(request_wiphy->regd, regd);
3560 reset_regdomains(false, rd);
3564 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
3565 if (!intersected_rd)
3569 * We can trash what CRDA provided now.
3570 * However if a driver requested this specific regulatory
3571 * domain we keep it for its private use
3573 tmp = get_wiphy_regdom(request_wiphy);
3574 rcu_assign_pointer(request_wiphy->regd, rd);
3575 rcu_free_regdom(tmp);
3579 reset_regdomains(false, intersected_rd);
3584 static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
3585 struct regulatory_request *country_ie_request)
3587 struct wiphy *request_wiphy;
3589 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
3590 !is_unknown_alpha2(rd->alpha2))
3594 * Lets only bother proceeding on the same alpha2 if the current
3595 * rd is non static (it means CRDA was present and was used last)
3596 * and the pending request came in from a country IE
3599 if (!is_valid_rd(rd)) {
3600 pr_err("Invalid regulatory domain detected: %c%c\n",
3601 rd->alpha2[0], rd->alpha2[1]);
3602 print_regdomain_info(rd);
3606 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
3610 if (country_ie_request->intersect)
3613 reset_regdomains(false, rd);
3618 * Use this call to set the current regulatory domain. Conflicts with
3619 * multiple drivers can be ironed out later. Caller must've already
3620 * kmalloc'd the rd structure.
3622 int set_regdom(const struct ieee80211_regdomain *rd,
3623 enum ieee80211_regd_source regd_src)
3625 struct regulatory_request *lr;
3626 bool user_reset = false;
3629 if (IS_ERR_OR_NULL(rd))
3632 if (!reg_is_valid_request(rd->alpha2)) {
3637 if (regd_src == REGD_SOURCE_CRDA)
3638 reset_crda_timeouts();
3640 lr = get_last_request();
3642 /* Note that this doesn't update the wiphys, this is done below */
3643 switch (lr->initiator) {
3644 case NL80211_REGDOM_SET_BY_CORE:
3645 r = reg_set_rd_core(rd);
3647 case NL80211_REGDOM_SET_BY_USER:
3648 cfg80211_save_user_regdom(rd);
3649 r = reg_set_rd_user(rd, lr);
3652 case NL80211_REGDOM_SET_BY_DRIVER:
3653 r = reg_set_rd_driver(rd, lr);
3655 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
3656 r = reg_set_rd_country_ie(rd, lr);
3659 WARN(1, "invalid initiator %d\n", lr->initiator);
3667 reg_set_request_processed();
3670 /* Back to world regulatory in case of errors */
3671 restore_regulatory_settings(user_reset, false);
3678 /* This would make this whole thing pointless */
3679 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
3682 /* update all wiphys now with the new established regulatory domain */
3683 update_all_wiphy_regulatory(lr->initiator);
3685 print_regdomain(get_cfg80211_regdom());
3687 nl80211_send_reg_change_event(lr);
3689 reg_set_request_processed();
3694 static int __regulatory_set_wiphy_regd(struct wiphy *wiphy,
3695 struct ieee80211_regdomain *rd)
3697 const struct ieee80211_regdomain *regd;
3698 const struct ieee80211_regdomain *prev_regd;
3699 struct cfg80211_registered_device *rdev;
3701 if (WARN_ON(!wiphy || !rd))
3704 if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED),
3705 "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n"))
3708 if (WARN(!is_valid_rd(rd), "Invalid regulatory domain detected\n")) {
3709 print_regdomain_info(rd);
3713 regd = reg_copy_regd(rd);
3715 return PTR_ERR(regd);
3717 rdev = wiphy_to_rdev(wiphy);
3719 spin_lock(®_requests_lock);
3720 prev_regd = rdev->requested_regd;
3721 rdev->requested_regd = regd;
3722 spin_unlock(®_requests_lock);
3728 int regulatory_set_wiphy_regd(struct wiphy *wiphy,
3729 struct ieee80211_regdomain *rd)
3731 int ret = __regulatory_set_wiphy_regd(wiphy, rd);
3736 schedule_work(®_work);
3739 EXPORT_SYMBOL(regulatory_set_wiphy_regd);
3741 int regulatory_set_wiphy_regd_sync_rtnl(struct wiphy *wiphy,
3742 struct ieee80211_regdomain *rd)
3748 ret = __regulatory_set_wiphy_regd(wiphy, rd);
3752 /* process the request immediately */
3753 reg_process_self_managed_hints();
3756 EXPORT_SYMBOL(regulatory_set_wiphy_regd_sync_rtnl);
3758 void wiphy_regulatory_register(struct wiphy *wiphy)
3760 struct regulatory_request *lr = get_last_request();
3762 /* self-managed devices ignore beacon hints and country IE */
3763 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
3764 wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS |
3765 REGULATORY_COUNTRY_IE_IGNORE;
3768 * The last request may have been received before this
3769 * registration call. Call the driver notifier if
3770 * initiator is USER.
3772 if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
3773 reg_call_notifier(wiphy, lr);
3776 if (!reg_dev_ignore_cell_hint(wiphy))
3777 reg_num_devs_support_basehint++;
3779 wiphy_update_regulatory(wiphy, lr->initiator);
3780 wiphy_all_share_dfs_chan_state(wiphy);
3783 void wiphy_regulatory_deregister(struct wiphy *wiphy)
3785 struct wiphy *request_wiphy = NULL;
3786 struct regulatory_request *lr;
3788 lr = get_last_request();
3790 if (!reg_dev_ignore_cell_hint(wiphy))
3791 reg_num_devs_support_basehint--;
3793 rcu_free_regdom(get_wiphy_regdom(wiphy));
3794 RCU_INIT_POINTER(wiphy->regd, NULL);
3797 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
3799 if (!request_wiphy || request_wiphy != wiphy)
3802 lr->wiphy_idx = WIPHY_IDX_INVALID;
3803 lr->country_ie_env = ENVIRON_ANY;
3807 * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for
3808 * UNII band definitions
3810 int cfg80211_get_unii(int freq)
3813 if (freq >= 5150 && freq <= 5250)
3817 if (freq > 5250 && freq <= 5350)
3821 if (freq > 5350 && freq <= 5470)
3825 if (freq > 5470 && freq <= 5725)
3829 if (freq > 5725 && freq <= 5825)
3835 bool regulatory_indoor_allowed(void)
3837 return reg_is_indoor;
3840 bool regulatory_pre_cac_allowed(struct wiphy *wiphy)
3842 const struct ieee80211_regdomain *regd = NULL;
3843 const struct ieee80211_regdomain *wiphy_regd = NULL;
3844 bool pre_cac_allowed = false;
3848 regd = rcu_dereference(cfg80211_regdomain);
3849 wiphy_regd = rcu_dereference(wiphy->regd);
3851 if (regd->dfs_region == NL80211_DFS_ETSI)
3852 pre_cac_allowed = true;
3856 return pre_cac_allowed;
3859 if (regd->dfs_region == wiphy_regd->dfs_region &&
3860 wiphy_regd->dfs_region == NL80211_DFS_ETSI)
3861 pre_cac_allowed = true;
3865 return pre_cac_allowed;
3868 void regulatory_propagate_dfs_state(struct wiphy *wiphy,
3869 struct cfg80211_chan_def *chandef,
3870 enum nl80211_dfs_state dfs_state,
3871 enum nl80211_radar_event event)
3873 struct cfg80211_registered_device *rdev;
3877 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
3880 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
3881 if (wiphy == &rdev->wiphy)
3884 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
3887 if (!ieee80211_get_channel(&rdev->wiphy,
3888 chandef->chan->center_freq))
3891 cfg80211_set_dfs_state(&rdev->wiphy, chandef, dfs_state);
3893 if (event == NL80211_RADAR_DETECTED ||
3894 event == NL80211_RADAR_CAC_FINISHED)
3895 cfg80211_sched_dfs_chan_update(rdev);
3897 nl80211_radar_notify(rdev, chandef, event, NULL, GFP_KERNEL);
3901 static int __init regulatory_init_db(void)
3906 * It's possible that - due to other bugs/issues - cfg80211
3907 * never called regulatory_init() below, or that it failed;
3908 * in that case, don't try to do any further work here as
3909 * it's doomed to lead to crashes.
3911 if (IS_ERR_OR_NULL(reg_pdev))
3914 err = load_builtin_regdb_keys();
3918 /* We always try to get an update for the static regdomain */
3919 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
3921 if (err == -ENOMEM) {
3922 platform_device_unregister(reg_pdev);
3926 * N.B. kobject_uevent_env() can fail mainly for when we're out
3927 * memory which is handled and propagated appropriately above
3928 * but it can also fail during a netlink_broadcast() or during
3929 * early boot for call_usermodehelper(). For now treat these
3930 * errors as non-fatal.
3932 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
3936 * Finally, if the user set the module parameter treat it
3939 if (!is_world_regdom(ieee80211_regdom))
3940 regulatory_hint_user(ieee80211_regdom,
3941 NL80211_USER_REG_HINT_USER);
3946 late_initcall(regulatory_init_db);
3949 int __init regulatory_init(void)
3951 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
3952 if (IS_ERR(reg_pdev))
3953 return PTR_ERR(reg_pdev);
3955 spin_lock_init(®_requests_lock);
3956 spin_lock_init(®_pending_beacons_lock);
3957 spin_lock_init(®_indoor_lock);
3959 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
3961 user_alpha2[0] = '9';
3962 user_alpha2[1] = '7';
3965 return regulatory_init_db();
3971 void regulatory_exit(void)
3973 struct regulatory_request *reg_request, *tmp;
3974 struct reg_beacon *reg_beacon, *btmp;
3976 cancel_work_sync(®_work);
3977 cancel_crda_timeout_sync();
3978 cancel_delayed_work_sync(®_check_chans);
3980 /* Lock to suppress warnings */
3982 reset_regdomains(true, NULL);
3985 dev_set_uevent_suppress(®_pdev->dev, true);
3987 platform_device_unregister(reg_pdev);
3989 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
3990 list_del(®_beacon->list);
3994 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
3995 list_del(®_beacon->list);
3999 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
4000 list_del(®_request->list);
4004 if (!IS_ERR_OR_NULL(regdb))
4006 if (!IS_ERR_OR_NULL(cfg80211_user_regdom))
4007 kfree(cfg80211_user_regdom);
4009 free_regdb_keyring();