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 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);
136 static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
138 return rcu_dereference_rtnl(cfg80211_regdomain);
141 const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
143 return rcu_dereference_rtnl(wiphy->regd);
146 static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region)
148 switch (dfs_region) {
149 case NL80211_DFS_UNSET:
151 case NL80211_DFS_FCC:
153 case NL80211_DFS_ETSI:
161 enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy)
163 const struct ieee80211_regdomain *regd = NULL;
164 const struct ieee80211_regdomain *wiphy_regd = NULL;
166 regd = get_cfg80211_regdom();
170 wiphy_regd = get_wiphy_regdom(wiphy);
174 if (wiphy_regd->dfs_region == regd->dfs_region)
177 pr_debug("%s: device specific dfs_region (%s) disagrees with cfg80211's central dfs_region (%s)\n",
178 dev_name(&wiphy->dev),
179 reg_dfs_region_str(wiphy_regd->dfs_region),
180 reg_dfs_region_str(regd->dfs_region));
183 return regd->dfs_region;
186 static void rcu_free_regdom(const struct ieee80211_regdomain *r)
190 kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
193 static struct regulatory_request *get_last_request(void)
195 return rcu_dereference_rtnl(last_request);
198 /* Used to queue up regulatory hints */
199 static LIST_HEAD(reg_requests_list);
200 static spinlock_t reg_requests_lock;
202 /* Used to queue up beacon hints for review */
203 static LIST_HEAD(reg_pending_beacons);
204 static spinlock_t reg_pending_beacons_lock;
206 /* Used to keep track of processed beacon hints */
207 static LIST_HEAD(reg_beacon_list);
210 struct list_head list;
211 struct ieee80211_channel chan;
214 static void reg_check_chans_work(struct work_struct *work);
215 static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work);
217 static void reg_todo(struct work_struct *work);
218 static DECLARE_WORK(reg_work, reg_todo);
220 /* We keep a static world regulatory domain in case of the absence of CRDA */
221 static const struct ieee80211_regdomain world_regdom = {
225 /* IEEE 802.11b/g, channels 1..11 */
226 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
227 /* IEEE 802.11b/g, channels 12..13. */
228 REG_RULE(2467-10, 2472+10, 20, 6, 20,
229 NL80211_RRF_NO_IR | NL80211_RRF_AUTO_BW),
230 /* IEEE 802.11 channel 14 - Only JP enables
231 * this and for 802.11b only */
232 REG_RULE(2484-10, 2484+10, 20, 6, 20,
234 NL80211_RRF_NO_OFDM),
235 /* IEEE 802.11a, channel 36..48 */
236 REG_RULE(5180-10, 5240+10, 80, 6, 20,
238 NL80211_RRF_AUTO_BW),
240 /* IEEE 802.11a, channel 52..64 - DFS required */
241 REG_RULE(5260-10, 5320+10, 80, 6, 20,
243 NL80211_RRF_AUTO_BW |
246 /* IEEE 802.11a, channel 100..144 - DFS required */
247 REG_RULE(5500-10, 5720+10, 160, 6, 20,
251 /* IEEE 802.11a, channel 149..165 */
252 REG_RULE(5745-10, 5825+10, 80, 6, 20,
255 /* IEEE 802.11ad (60GHz), channels 1..3 */
256 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
260 /* protected by RTNL */
261 static const struct ieee80211_regdomain *cfg80211_world_regdom =
264 static char *ieee80211_regdom = "00";
265 static char user_alpha2[2];
267 module_param(ieee80211_regdom, charp, 0444);
268 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
270 static void reg_free_request(struct regulatory_request *request)
272 if (request == &core_request_world)
275 if (request != get_last_request())
279 static void reg_free_last_request(void)
281 struct regulatory_request *lr = get_last_request();
283 if (lr != &core_request_world && lr)
284 kfree_rcu(lr, rcu_head);
287 static void reg_update_last_request(struct regulatory_request *request)
289 struct regulatory_request *lr;
291 lr = get_last_request();
295 reg_free_last_request();
296 rcu_assign_pointer(last_request, request);
299 static void reset_regdomains(bool full_reset,
300 const struct ieee80211_regdomain *new_regdom)
302 const struct ieee80211_regdomain *r;
306 r = get_cfg80211_regdom();
308 /* avoid freeing static information or freeing something twice */
309 if (r == cfg80211_world_regdom)
311 if (cfg80211_world_regdom == &world_regdom)
312 cfg80211_world_regdom = NULL;
313 if (r == &world_regdom)
317 rcu_free_regdom(cfg80211_world_regdom);
319 cfg80211_world_regdom = &world_regdom;
320 rcu_assign_pointer(cfg80211_regdomain, new_regdom);
325 reg_update_last_request(&core_request_world);
329 * Dynamic world regulatory domain requested by the wireless
330 * core upon initialization
332 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
334 struct regulatory_request *lr;
336 lr = get_last_request();
340 reset_regdomains(false, rd);
342 cfg80211_world_regdom = rd;
345 bool is_world_regdom(const char *alpha2)
349 return alpha2[0] == '0' && alpha2[1] == '0';
352 static bool is_alpha2_set(const char *alpha2)
356 return alpha2[0] && alpha2[1];
359 static bool is_unknown_alpha2(const char *alpha2)
364 * Special case where regulatory domain was built by driver
365 * but a specific alpha2 cannot be determined
367 return alpha2[0] == '9' && alpha2[1] == '9';
370 static bool is_intersected_alpha2(const char *alpha2)
375 * Special case where regulatory domain is the
376 * result of an intersection between two regulatory domain
379 return alpha2[0] == '9' && alpha2[1] == '8';
382 static bool is_an_alpha2(const char *alpha2)
386 return isalpha(alpha2[0]) && isalpha(alpha2[1]);
389 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
391 if (!alpha2_x || !alpha2_y)
393 return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
396 static bool regdom_changes(const char *alpha2)
398 const struct ieee80211_regdomain *r = get_cfg80211_regdom();
402 return !alpha2_equal(r->alpha2, alpha2);
406 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
407 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
408 * has ever been issued.
410 static bool is_user_regdom_saved(void)
412 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
415 /* This would indicate a mistake on the design */
416 if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
417 "Unexpected user alpha2: %c%c\n",
418 user_alpha2[0], user_alpha2[1]))
424 static const struct ieee80211_regdomain *
425 reg_copy_regd(const struct ieee80211_regdomain *src_regd)
427 struct ieee80211_regdomain *regd;
432 sizeof(struct ieee80211_regdomain) +
433 src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
435 regd = kzalloc(size_of_regd, GFP_KERNEL);
437 return ERR_PTR(-ENOMEM);
439 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
441 for (i = 0; i < src_regd->n_reg_rules; i++)
442 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
443 sizeof(struct ieee80211_reg_rule));
448 struct reg_regdb_apply_request {
449 struct list_head list;
450 const struct ieee80211_regdomain *regdom;
453 static LIST_HEAD(reg_regdb_apply_list);
454 static DEFINE_MUTEX(reg_regdb_apply_mutex);
456 static void reg_regdb_apply(struct work_struct *work)
458 struct reg_regdb_apply_request *request;
462 mutex_lock(®_regdb_apply_mutex);
463 while (!list_empty(®_regdb_apply_list)) {
464 request = list_first_entry(®_regdb_apply_list,
465 struct reg_regdb_apply_request,
467 list_del(&request->list);
469 set_regdom(request->regdom, REGD_SOURCE_INTERNAL_DB);
472 mutex_unlock(®_regdb_apply_mutex);
477 static DECLARE_WORK(reg_regdb_work, reg_regdb_apply);
479 static int reg_schedule_apply(const struct ieee80211_regdomain *regdom)
481 struct reg_regdb_apply_request *request;
483 request = kzalloc(sizeof(struct reg_regdb_apply_request), GFP_KERNEL);
489 request->regdom = regdom;
491 mutex_lock(®_regdb_apply_mutex);
492 list_add_tail(&request->list, ®_regdb_apply_list);
493 mutex_unlock(®_regdb_apply_mutex);
495 schedule_work(®_regdb_work);
499 #ifdef CONFIG_CFG80211_CRDA_SUPPORT
500 /* Max number of consecutive attempts to communicate with CRDA */
501 #define REG_MAX_CRDA_TIMEOUTS 10
503 static u32 reg_crda_timeouts;
505 static void crda_timeout_work(struct work_struct *work);
506 static DECLARE_DELAYED_WORK(crda_timeout, crda_timeout_work);
508 static void crda_timeout_work(struct work_struct *work)
510 pr_debug("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
513 restore_regulatory_settings(true);
517 static void cancel_crda_timeout(void)
519 cancel_delayed_work(&crda_timeout);
522 static void cancel_crda_timeout_sync(void)
524 cancel_delayed_work_sync(&crda_timeout);
527 static void reset_crda_timeouts(void)
529 reg_crda_timeouts = 0;
533 * This lets us keep regulatory code which is updated on a regulatory
534 * basis in userspace.
536 static int call_crda(const char *alpha2)
539 char *env[] = { country, NULL };
542 snprintf(country, sizeof(country), "COUNTRY=%c%c",
543 alpha2[0], alpha2[1]);
545 if (reg_crda_timeouts > REG_MAX_CRDA_TIMEOUTS) {
546 pr_debug("Exceeded CRDA call max attempts. Not calling CRDA\n");
550 if (!is_world_regdom((char *) alpha2))
551 pr_debug("Calling CRDA for country: %c%c\n",
552 alpha2[0], alpha2[1]);
554 pr_debug("Calling CRDA to update world regulatory domain\n");
556 ret = kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, env);
560 queue_delayed_work(system_power_efficient_wq,
561 &crda_timeout, msecs_to_jiffies(3142));
565 static inline void cancel_crda_timeout(void) {}
566 static inline void cancel_crda_timeout_sync(void) {}
567 static inline void reset_crda_timeouts(void) {}
568 static inline int call_crda(const char *alpha2)
572 #endif /* CONFIG_CFG80211_CRDA_SUPPORT */
574 /* code to directly load a firmware database through request_firmware */
575 static const struct fwdb_header *regdb;
577 struct fwdb_country {
580 /* this struct cannot be extended */
581 } __packed __aligned(4);
583 struct fwdb_collection {
587 /* no optional data yet */
588 /* aligned to 2, then followed by __be16 array of rule pointers */
589 } __packed __aligned(4);
592 FWDB_FLAG_NO_OFDM = BIT(0),
593 FWDB_FLAG_NO_OUTDOOR = BIT(1),
594 FWDB_FLAG_DFS = BIT(2),
595 FWDB_FLAG_NO_IR = BIT(3),
596 FWDB_FLAG_AUTO_BW = BIT(4),
605 struct fwdb_wmm_rule {
606 struct fwdb_wmm_ac client[IEEE80211_NUM_ACS];
607 struct fwdb_wmm_ac ap[IEEE80211_NUM_ACS];
614 __be32 start, end, max_bw;
615 /* start of optional data */
618 } __packed __aligned(4);
620 #define FWDB_MAGIC 0x52474442
621 #define FWDB_VERSION 20
626 struct fwdb_country country[];
627 } __packed __aligned(4);
629 static int ecw2cw(int ecw)
631 return (1 << ecw) - 1;
634 static bool valid_wmm(struct fwdb_wmm_rule *rule)
636 struct fwdb_wmm_ac *ac = (struct fwdb_wmm_ac *)rule;
639 for (i = 0; i < IEEE80211_NUM_ACS * 2; i++) {
640 u16 cw_min = ecw2cw((ac[i].ecw & 0xf0) >> 4);
641 u16 cw_max = ecw2cw(ac[i].ecw & 0x0f);
642 u8 aifsn = ac[i].aifsn;
644 if (cw_min >= cw_max)
654 static bool valid_rule(const u8 *data, unsigned int size, u16 rule_ptr)
656 struct fwdb_rule *rule = (void *)(data + (rule_ptr << 2));
658 if ((u8 *)rule + sizeof(rule->len) > data + size)
661 /* mandatory fields */
662 if (rule->len < offsetofend(struct fwdb_rule, max_bw))
664 if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr)) {
665 u32 wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
666 struct fwdb_wmm_rule *wmm;
668 if (wmm_ptr + sizeof(struct fwdb_wmm_rule) > size)
671 wmm = (void *)(data + wmm_ptr);
679 static bool valid_country(const u8 *data, unsigned int size,
680 const struct fwdb_country *country)
682 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
683 struct fwdb_collection *coll = (void *)(data + ptr);
687 /* make sure we can read len/n_rules */
688 if ((u8 *)coll + offsetofend(typeof(*coll), n_rules) > data + size)
691 /* make sure base struct and all rules fit */
692 if ((u8 *)coll + ALIGN(coll->len, 2) +
693 (coll->n_rules * 2) > data + size)
696 /* mandatory fields must exist */
697 if (coll->len < offsetofend(struct fwdb_collection, dfs_region))
700 rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
702 for (i = 0; i < coll->n_rules; i++) {
703 u16 rule_ptr = be16_to_cpu(rules_ptr[i]);
705 if (!valid_rule(data, size, rule_ptr))
712 #ifdef CONFIG_CFG80211_REQUIRE_SIGNED_REGDB
713 static struct key *builtin_regdb_keys;
715 static void __init load_keys_from_buffer(const u8 *p, unsigned int buflen)
717 const u8 *end = p + buflen;
722 /* Each cert begins with an ASN.1 SEQUENCE tag and must be more
723 * than 256 bytes in size.
730 plen = (p[2] << 8) | p[3];
735 key = key_create_or_update(make_key_ref(builtin_regdb_keys, 1),
736 "asymmetric", NULL, p, plen,
737 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
738 KEY_USR_VIEW | KEY_USR_READ),
739 KEY_ALLOC_NOT_IN_QUOTA |
741 KEY_ALLOC_BYPASS_RESTRICTION);
743 pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
746 pr_notice("Loaded X.509 cert '%s'\n",
747 key_ref_to_ptr(key)->description);
756 pr_err("Problem parsing in-kernel X.509 certificate list\n");
759 static int __init load_builtin_regdb_keys(void)
762 keyring_alloc(".builtin_regdb_keys",
763 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
764 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
765 KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
766 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
767 if (IS_ERR(builtin_regdb_keys))
768 return PTR_ERR(builtin_regdb_keys);
770 pr_notice("Loading compiled-in X.509 certificates for regulatory database\n");
772 #ifdef CONFIG_CFG80211_USE_KERNEL_REGDB_KEYS
773 load_keys_from_buffer(shipped_regdb_certs, shipped_regdb_certs_len);
775 #ifdef CONFIG_CFG80211_EXTRA_REGDB_KEYDIR
776 if (CONFIG_CFG80211_EXTRA_REGDB_KEYDIR[0] != '\0')
777 load_keys_from_buffer(extra_regdb_certs, extra_regdb_certs_len);
783 static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
785 const struct firmware *sig;
788 if (request_firmware(&sig, "regulatory.db.p7s", ®_pdev->dev))
791 result = verify_pkcs7_signature(data, size, sig->data, sig->size,
793 VERIFYING_UNSPECIFIED_SIGNATURE,
796 release_firmware(sig);
801 static void free_regdb_keyring(void)
803 key_put(builtin_regdb_keys);
806 static int load_builtin_regdb_keys(void)
811 static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
816 static void free_regdb_keyring(void)
819 #endif /* CONFIG_CFG80211_REQUIRE_SIGNED_REGDB */
821 static bool valid_regdb(const u8 *data, unsigned int size)
823 const struct fwdb_header *hdr = (void *)data;
824 const struct fwdb_country *country;
826 if (size < sizeof(*hdr))
829 if (hdr->magic != cpu_to_be32(FWDB_MAGIC))
832 if (hdr->version != cpu_to_be32(FWDB_VERSION))
835 if (!regdb_has_valid_signature(data, size))
838 country = &hdr->country[0];
839 while ((u8 *)(country + 1) <= data + size) {
840 if (!country->coll_ptr)
842 if (!valid_country(data, size, country))
850 static void set_wmm_rule(const struct fwdb_header *db,
851 const struct fwdb_country *country,
852 const struct fwdb_rule *rule,
853 struct ieee80211_reg_rule *rrule)
855 struct ieee80211_wmm_rule *wmm_rule = &rrule->wmm_rule;
856 struct fwdb_wmm_rule *wmm;
857 unsigned int i, wmm_ptr;
859 wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
860 wmm = (void *)((u8 *)db + wmm_ptr);
862 if (!valid_wmm(wmm)) {
863 pr_err("Invalid regulatory WMM rule %u-%u in domain %c%c\n",
864 be32_to_cpu(rule->start), be32_to_cpu(rule->end),
865 country->alpha2[0], country->alpha2[1]);
869 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
870 wmm_rule->client[i].cw_min =
871 ecw2cw((wmm->client[i].ecw & 0xf0) >> 4);
872 wmm_rule->client[i].cw_max = ecw2cw(wmm->client[i].ecw & 0x0f);
873 wmm_rule->client[i].aifsn = wmm->client[i].aifsn;
874 wmm_rule->client[i].cot =
875 1000 * be16_to_cpu(wmm->client[i].cot);
876 wmm_rule->ap[i].cw_min = ecw2cw((wmm->ap[i].ecw & 0xf0) >> 4);
877 wmm_rule->ap[i].cw_max = ecw2cw(wmm->ap[i].ecw & 0x0f);
878 wmm_rule->ap[i].aifsn = wmm->ap[i].aifsn;
879 wmm_rule->ap[i].cot = 1000 * be16_to_cpu(wmm->ap[i].cot);
882 rrule->has_wmm = true;
885 static int __regdb_query_wmm(const struct fwdb_header *db,
886 const struct fwdb_country *country, int freq,
887 struct ieee80211_reg_rule *rrule)
889 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
890 struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
893 for (i = 0; i < coll->n_rules; i++) {
894 __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
895 unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
896 struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
898 if (rule->len < offsetofend(struct fwdb_rule, wmm_ptr))
901 if (freq >= KHZ_TO_MHZ(be32_to_cpu(rule->start)) &&
902 freq <= KHZ_TO_MHZ(be32_to_cpu(rule->end))) {
903 set_wmm_rule(db, country, rule, rrule);
911 int reg_query_regdb_wmm(char *alpha2, int freq, struct ieee80211_reg_rule *rule)
913 const struct fwdb_header *hdr = regdb;
914 const struct fwdb_country *country;
920 return PTR_ERR(regdb);
922 country = &hdr->country[0];
923 while (country->coll_ptr) {
924 if (alpha2_equal(alpha2, country->alpha2))
925 return __regdb_query_wmm(regdb, country, freq, rule);
932 EXPORT_SYMBOL(reg_query_regdb_wmm);
934 static int regdb_query_country(const struct fwdb_header *db,
935 const struct fwdb_country *country)
937 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
938 struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
939 struct ieee80211_regdomain *regdom;
940 unsigned int size_of_regd, i;
942 size_of_regd = sizeof(struct ieee80211_regdomain) +
943 coll->n_rules * sizeof(struct ieee80211_reg_rule);
945 regdom = kzalloc(size_of_regd, GFP_KERNEL);
949 regdom->n_reg_rules = coll->n_rules;
950 regdom->alpha2[0] = country->alpha2[0];
951 regdom->alpha2[1] = country->alpha2[1];
952 regdom->dfs_region = coll->dfs_region;
954 for (i = 0; i < regdom->n_reg_rules; i++) {
955 __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
956 unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
957 struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
958 struct ieee80211_reg_rule *rrule = ®dom->reg_rules[i];
960 rrule->freq_range.start_freq_khz = be32_to_cpu(rule->start);
961 rrule->freq_range.end_freq_khz = be32_to_cpu(rule->end);
962 rrule->freq_range.max_bandwidth_khz = be32_to_cpu(rule->max_bw);
964 rrule->power_rule.max_antenna_gain = 0;
965 rrule->power_rule.max_eirp = be16_to_cpu(rule->max_eirp);
968 if (rule->flags & FWDB_FLAG_NO_OFDM)
969 rrule->flags |= NL80211_RRF_NO_OFDM;
970 if (rule->flags & FWDB_FLAG_NO_OUTDOOR)
971 rrule->flags |= NL80211_RRF_NO_OUTDOOR;
972 if (rule->flags & FWDB_FLAG_DFS)
973 rrule->flags |= NL80211_RRF_DFS;
974 if (rule->flags & FWDB_FLAG_NO_IR)
975 rrule->flags |= NL80211_RRF_NO_IR;
976 if (rule->flags & FWDB_FLAG_AUTO_BW)
977 rrule->flags |= NL80211_RRF_AUTO_BW;
979 rrule->dfs_cac_ms = 0;
981 /* handle optional data */
982 if (rule->len >= offsetofend(struct fwdb_rule, cac_timeout))
984 1000 * be16_to_cpu(rule->cac_timeout);
985 if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr))
986 set_wmm_rule(db, country, rule, rrule);
989 return reg_schedule_apply(regdom);
992 static int query_regdb(const char *alpha2)
994 const struct fwdb_header *hdr = regdb;
995 const struct fwdb_country *country;
1000 return PTR_ERR(regdb);
1002 country = &hdr->country[0];
1003 while (country->coll_ptr) {
1004 if (alpha2_equal(alpha2, country->alpha2))
1005 return regdb_query_country(regdb, country);
1012 static void regdb_fw_cb(const struct firmware *fw, void *context)
1015 bool restore = true;
1019 pr_info("failed to load regulatory.db\n");
1020 set_error = -ENODATA;
1021 } else if (!valid_regdb(fw->data, fw->size)) {
1022 pr_info("loaded regulatory.db is malformed or signature is missing/invalid\n");
1023 set_error = -EINVAL;
1027 if (WARN_ON(regdb && !IS_ERR(regdb))) {
1028 /* just restore and free new db */
1029 } else if (set_error) {
1030 regdb = ERR_PTR(set_error);
1032 db = kmemdup(fw->data, fw->size, GFP_KERNEL);
1035 restore = context && query_regdb(context);
1042 restore_regulatory_settings(true);
1048 release_firmware(fw);
1051 static int query_regdb_file(const char *alpha2)
1056 return query_regdb(alpha2);
1058 alpha2 = kmemdup(alpha2, 2, GFP_KERNEL);
1062 return request_firmware_nowait(THIS_MODULE, true, "regulatory.db",
1063 ®_pdev->dev, GFP_KERNEL,
1064 (void *)alpha2, regdb_fw_cb);
1067 int reg_reload_regdb(void)
1069 const struct firmware *fw;
1073 err = request_firmware(&fw, "regulatory.db", ®_pdev->dev);
1077 if (!valid_regdb(fw->data, fw->size)) {
1082 db = kmemdup(fw->data, fw->size, GFP_KERNEL);
1089 if (!IS_ERR_OR_NULL(regdb))
1095 release_firmware(fw);
1099 static bool reg_query_database(struct regulatory_request *request)
1101 if (query_regdb_file(request->alpha2) == 0)
1104 if (call_crda(request->alpha2) == 0)
1110 bool reg_is_valid_request(const char *alpha2)
1112 struct regulatory_request *lr = get_last_request();
1114 if (!lr || lr->processed)
1117 return alpha2_equal(lr->alpha2, alpha2);
1120 static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
1122 struct regulatory_request *lr = get_last_request();
1125 * Follow the driver's regulatory domain, if present, unless a country
1126 * IE has been processed or a user wants to help complaince further
1128 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1129 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
1131 return get_wiphy_regdom(wiphy);
1133 return get_cfg80211_regdom();
1137 reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd,
1138 const struct ieee80211_reg_rule *rule)
1140 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
1141 const struct ieee80211_freq_range *freq_range_tmp;
1142 const struct ieee80211_reg_rule *tmp;
1143 u32 start_freq, end_freq, idx, no;
1145 for (idx = 0; idx < rd->n_reg_rules; idx++)
1146 if (rule == &rd->reg_rules[idx])
1149 if (idx == rd->n_reg_rules)
1152 /* get start_freq */
1156 tmp = &rd->reg_rules[--no];
1157 freq_range_tmp = &tmp->freq_range;
1159 if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
1162 freq_range = freq_range_tmp;
1165 start_freq = freq_range->start_freq_khz;
1168 freq_range = &rule->freq_range;
1171 while (no < rd->n_reg_rules - 1) {
1172 tmp = &rd->reg_rules[++no];
1173 freq_range_tmp = &tmp->freq_range;
1175 if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
1178 freq_range = freq_range_tmp;
1181 end_freq = freq_range->end_freq_khz;
1183 return end_freq - start_freq;
1186 unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
1187 const struct ieee80211_reg_rule *rule)
1189 unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule);
1191 if (rule->flags & NL80211_RRF_NO_160MHZ)
1192 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80));
1193 if (rule->flags & NL80211_RRF_NO_80MHZ)
1194 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40));
1197 * HT40+/HT40- limits are handled per-channel. Only limit BW if both
1200 if (rule->flags & NL80211_RRF_NO_HT40MINUS &&
1201 rule->flags & NL80211_RRF_NO_HT40PLUS)
1202 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20));
1207 /* Sanity check on a regulatory rule */
1208 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
1210 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
1213 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
1216 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
1219 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
1221 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
1222 freq_range->max_bandwidth_khz > freq_diff)
1228 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
1230 const struct ieee80211_reg_rule *reg_rule = NULL;
1233 if (!rd->n_reg_rules)
1236 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
1239 for (i = 0; i < rd->n_reg_rules; i++) {
1240 reg_rule = &rd->reg_rules[i];
1241 if (!is_valid_reg_rule(reg_rule))
1249 * freq_in_rule_band - tells us if a frequency is in a frequency band
1250 * @freq_range: frequency rule we want to query
1251 * @freq_khz: frequency we are inquiring about
1253 * This lets us know if a specific frequency rule is or is not relevant to
1254 * a specific frequency's band. Bands are device specific and artificial
1255 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
1256 * however it is safe for now to assume that a frequency rule should not be
1257 * part of a frequency's band if the start freq or end freq are off by more
1258 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 20 GHz for the
1260 * This resolution can be lowered and should be considered as we add
1261 * regulatory rule support for other "bands".
1263 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
1266 #define ONE_GHZ_IN_KHZ 1000000
1268 * From 802.11ad: directional multi-gigabit (DMG):
1269 * Pertaining to operation in a frequency band containing a channel
1270 * with the Channel starting frequency above 45 GHz.
1272 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
1273 20 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
1274 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
1276 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
1279 #undef ONE_GHZ_IN_KHZ
1283 * Later on we can perhaps use the more restrictive DFS
1284 * region but we don't have information for that yet so
1285 * for now simply disallow conflicts.
1287 static enum nl80211_dfs_regions
1288 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
1289 const enum nl80211_dfs_regions dfs_region2)
1291 if (dfs_region1 != dfs_region2)
1292 return NL80211_DFS_UNSET;
1296 static void reg_wmm_rules_intersect(const struct ieee80211_wmm_ac *wmm_ac1,
1297 const struct ieee80211_wmm_ac *wmm_ac2,
1298 struct ieee80211_wmm_ac *intersect)
1300 intersect->cw_min = max_t(u16, wmm_ac1->cw_min, wmm_ac2->cw_min);
1301 intersect->cw_max = max_t(u16, wmm_ac1->cw_max, wmm_ac2->cw_max);
1302 intersect->cot = min_t(u16, wmm_ac1->cot, wmm_ac2->cot);
1303 intersect->aifsn = max_t(u8, wmm_ac1->aifsn, wmm_ac2->aifsn);
1307 * Helper for regdom_intersect(), this does the real
1308 * mathematical intersection fun
1310 static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
1311 const struct ieee80211_regdomain *rd2,
1312 const struct ieee80211_reg_rule *rule1,
1313 const struct ieee80211_reg_rule *rule2,
1314 struct ieee80211_reg_rule *intersected_rule)
1316 const struct ieee80211_freq_range *freq_range1, *freq_range2;
1317 struct ieee80211_freq_range *freq_range;
1318 const struct ieee80211_power_rule *power_rule1, *power_rule2;
1319 struct ieee80211_power_rule *power_rule;
1320 const struct ieee80211_wmm_rule *wmm_rule1, *wmm_rule2;
1321 struct ieee80211_wmm_rule *wmm_rule;
1322 u32 freq_diff, max_bandwidth1, max_bandwidth2;
1324 freq_range1 = &rule1->freq_range;
1325 freq_range2 = &rule2->freq_range;
1326 freq_range = &intersected_rule->freq_range;
1328 power_rule1 = &rule1->power_rule;
1329 power_rule2 = &rule2->power_rule;
1330 power_rule = &intersected_rule->power_rule;
1332 wmm_rule1 = &rule1->wmm_rule;
1333 wmm_rule2 = &rule2->wmm_rule;
1334 wmm_rule = &intersected_rule->wmm_rule;
1336 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
1337 freq_range2->start_freq_khz);
1338 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
1339 freq_range2->end_freq_khz);
1341 max_bandwidth1 = freq_range1->max_bandwidth_khz;
1342 max_bandwidth2 = freq_range2->max_bandwidth_khz;
1344 if (rule1->flags & NL80211_RRF_AUTO_BW)
1345 max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
1346 if (rule2->flags & NL80211_RRF_AUTO_BW)
1347 max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
1349 freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
1351 intersected_rule->flags = rule1->flags | rule2->flags;
1354 * In case NL80211_RRF_AUTO_BW requested for both rules
1355 * set AUTO_BW in intersected rule also. Next we will
1356 * calculate BW correctly in handle_channel function.
1357 * In other case remove AUTO_BW flag while we calculate
1358 * maximum bandwidth correctly and auto calculation is
1361 if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
1362 (rule2->flags & NL80211_RRF_AUTO_BW))
1363 intersected_rule->flags |= NL80211_RRF_AUTO_BW;
1365 intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
1367 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
1368 if (freq_range->max_bandwidth_khz > freq_diff)
1369 freq_range->max_bandwidth_khz = freq_diff;
1371 power_rule->max_eirp = min(power_rule1->max_eirp,
1372 power_rule2->max_eirp);
1373 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
1374 power_rule2->max_antenna_gain);
1376 intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms,
1379 if (rule1->has_wmm && rule2->has_wmm) {
1382 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1383 reg_wmm_rules_intersect(&wmm_rule1->client[ac],
1384 &wmm_rule2->client[ac],
1385 &wmm_rule->client[ac]);
1386 reg_wmm_rules_intersect(&wmm_rule1->ap[ac],
1391 intersected_rule->has_wmm = true;
1392 } else if (rule1->has_wmm) {
1393 *wmm_rule = *wmm_rule1;
1394 intersected_rule->has_wmm = true;
1395 } else if (rule2->has_wmm) {
1396 *wmm_rule = *wmm_rule2;
1397 intersected_rule->has_wmm = true;
1399 intersected_rule->has_wmm = false;
1402 if (!is_valid_reg_rule(intersected_rule))
1408 /* check whether old rule contains new rule */
1409 static bool rule_contains(struct ieee80211_reg_rule *r1,
1410 struct ieee80211_reg_rule *r2)
1412 /* for simplicity, currently consider only same flags */
1413 if (r1->flags != r2->flags)
1416 /* verify r1 is more restrictive */
1417 if ((r1->power_rule.max_antenna_gain >
1418 r2->power_rule.max_antenna_gain) ||
1419 r1->power_rule.max_eirp > r2->power_rule.max_eirp)
1422 /* make sure r2's range is contained within r1 */
1423 if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz ||
1424 r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz)
1427 /* and finally verify that r1.max_bw >= r2.max_bw */
1428 if (r1->freq_range.max_bandwidth_khz <
1429 r2->freq_range.max_bandwidth_khz)
1435 /* add or extend current rules. do nothing if rule is already contained */
1436 static void add_rule(struct ieee80211_reg_rule *rule,
1437 struct ieee80211_reg_rule *reg_rules, u32 *n_rules)
1439 struct ieee80211_reg_rule *tmp_rule;
1442 for (i = 0; i < *n_rules; i++) {
1443 tmp_rule = ®_rules[i];
1444 /* rule is already contained - do nothing */
1445 if (rule_contains(tmp_rule, rule))
1448 /* extend rule if possible */
1449 if (rule_contains(rule, tmp_rule)) {
1450 memcpy(tmp_rule, rule, sizeof(*rule));
1455 memcpy(®_rules[*n_rules], rule, sizeof(*rule));
1460 * regdom_intersect - do the intersection between two regulatory domains
1461 * @rd1: first regulatory domain
1462 * @rd2: second regulatory domain
1464 * Use this function to get the intersection between two regulatory domains.
1465 * Once completed we will mark the alpha2 for the rd as intersected, "98",
1466 * as no one single alpha2 can represent this regulatory domain.
1468 * Returns a pointer to the regulatory domain structure which will hold the
1469 * resulting intersection of rules between rd1 and rd2. We will
1470 * kzalloc() this structure for you.
1472 static struct ieee80211_regdomain *
1473 regdom_intersect(const struct ieee80211_regdomain *rd1,
1474 const struct ieee80211_regdomain *rd2)
1476 int r, size_of_regd;
1478 unsigned int num_rules = 0;
1479 const struct ieee80211_reg_rule *rule1, *rule2;
1480 struct ieee80211_reg_rule intersected_rule;
1481 struct ieee80211_regdomain *rd;
1487 * First we get a count of the rules we'll need, then we actually
1488 * build them. This is to so we can malloc() and free() a
1489 * regdomain once. The reason we use reg_rules_intersect() here
1490 * is it will return -EINVAL if the rule computed makes no sense.
1491 * All rules that do check out OK are valid.
1494 for (x = 0; x < rd1->n_reg_rules; x++) {
1495 rule1 = &rd1->reg_rules[x];
1496 for (y = 0; y < rd2->n_reg_rules; y++) {
1497 rule2 = &rd2->reg_rules[y];
1498 if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
1507 size_of_regd = sizeof(struct ieee80211_regdomain) +
1508 num_rules * sizeof(struct ieee80211_reg_rule);
1510 rd = kzalloc(size_of_regd, GFP_KERNEL);
1514 for (x = 0; x < rd1->n_reg_rules; x++) {
1515 rule1 = &rd1->reg_rules[x];
1516 for (y = 0; y < rd2->n_reg_rules; y++) {
1517 rule2 = &rd2->reg_rules[y];
1518 r = reg_rules_intersect(rd1, rd2, rule1, rule2,
1521 * No need to memset here the intersected rule here as
1522 * we're not using the stack anymore
1527 add_rule(&intersected_rule, rd->reg_rules,
1532 rd->alpha2[0] = '9';
1533 rd->alpha2[1] = '8';
1534 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
1541 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
1542 * want to just have the channel structure use these
1544 static u32 map_regdom_flags(u32 rd_flags)
1546 u32 channel_flags = 0;
1547 if (rd_flags & NL80211_RRF_NO_IR_ALL)
1548 channel_flags |= IEEE80211_CHAN_NO_IR;
1549 if (rd_flags & NL80211_RRF_DFS)
1550 channel_flags |= IEEE80211_CHAN_RADAR;
1551 if (rd_flags & NL80211_RRF_NO_OFDM)
1552 channel_flags |= IEEE80211_CHAN_NO_OFDM;
1553 if (rd_flags & NL80211_RRF_NO_OUTDOOR)
1554 channel_flags |= IEEE80211_CHAN_INDOOR_ONLY;
1555 if (rd_flags & NL80211_RRF_IR_CONCURRENT)
1556 channel_flags |= IEEE80211_CHAN_IR_CONCURRENT;
1557 if (rd_flags & NL80211_RRF_NO_HT40MINUS)
1558 channel_flags |= IEEE80211_CHAN_NO_HT40MINUS;
1559 if (rd_flags & NL80211_RRF_NO_HT40PLUS)
1560 channel_flags |= IEEE80211_CHAN_NO_HT40PLUS;
1561 if (rd_flags & NL80211_RRF_NO_80MHZ)
1562 channel_flags |= IEEE80211_CHAN_NO_80MHZ;
1563 if (rd_flags & NL80211_RRF_NO_160MHZ)
1564 channel_flags |= IEEE80211_CHAN_NO_160MHZ;
1565 return channel_flags;
1568 static const struct ieee80211_reg_rule *
1569 freq_reg_info_regd(u32 center_freq,
1570 const struct ieee80211_regdomain *regd, u32 bw)
1573 bool band_rule_found = false;
1574 bool bw_fits = false;
1577 return ERR_PTR(-EINVAL);
1579 for (i = 0; i < regd->n_reg_rules; i++) {
1580 const struct ieee80211_reg_rule *rr;
1581 const struct ieee80211_freq_range *fr = NULL;
1583 rr = ®d->reg_rules[i];
1584 fr = &rr->freq_range;
1587 * We only need to know if one frequency rule was
1588 * was in center_freq's band, that's enough, so lets
1589 * not overwrite it once found
1591 if (!band_rule_found)
1592 band_rule_found = freq_in_rule_band(fr, center_freq);
1594 bw_fits = cfg80211_does_bw_fit_range(fr, center_freq, bw);
1596 if (band_rule_found && bw_fits)
1600 if (!band_rule_found)
1601 return ERR_PTR(-ERANGE);
1603 return ERR_PTR(-EINVAL);
1606 static const struct ieee80211_reg_rule *
1607 __freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
1609 const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy);
1610 const struct ieee80211_reg_rule *reg_rule = NULL;
1613 for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
1614 reg_rule = freq_reg_info_regd(center_freq, regd, bw);
1615 if (!IS_ERR(reg_rule))
1622 const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
1625 return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(20));
1627 EXPORT_SYMBOL(freq_reg_info);
1629 const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
1631 switch (initiator) {
1632 case NL80211_REGDOM_SET_BY_CORE:
1634 case NL80211_REGDOM_SET_BY_USER:
1636 case NL80211_REGDOM_SET_BY_DRIVER:
1638 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1639 return "country element";
1645 EXPORT_SYMBOL(reg_initiator_name);
1647 static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd,
1648 const struct ieee80211_reg_rule *reg_rule,
1649 const struct ieee80211_channel *chan)
1651 const struct ieee80211_freq_range *freq_range = NULL;
1652 u32 max_bandwidth_khz, bw_flags = 0;
1654 freq_range = ®_rule->freq_range;
1656 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1657 /* Check if auto calculation requested */
1658 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
1659 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1661 /* If we get a reg_rule we can assume that at least 5Mhz fit */
1662 if (!cfg80211_does_bw_fit_range(freq_range,
1663 MHZ_TO_KHZ(chan->center_freq),
1665 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1666 if (!cfg80211_does_bw_fit_range(freq_range,
1667 MHZ_TO_KHZ(chan->center_freq),
1669 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1671 if (max_bandwidth_khz < MHZ_TO_KHZ(10))
1672 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1673 if (max_bandwidth_khz < MHZ_TO_KHZ(20))
1674 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1675 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1676 bw_flags |= IEEE80211_CHAN_NO_HT40;
1677 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1678 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1679 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1680 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1685 * Note that right now we assume the desired channel bandwidth
1686 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
1687 * per channel, the primary and the extension channel).
1689 static void handle_channel(struct wiphy *wiphy,
1690 enum nl80211_reg_initiator initiator,
1691 struct ieee80211_channel *chan)
1693 u32 flags, bw_flags = 0;
1694 const struct ieee80211_reg_rule *reg_rule = NULL;
1695 const struct ieee80211_power_rule *power_rule = NULL;
1696 struct wiphy *request_wiphy = NULL;
1697 struct regulatory_request *lr = get_last_request();
1698 const struct ieee80211_regdomain *regd;
1700 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1702 flags = chan->orig_flags;
1704 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
1705 if (IS_ERR(reg_rule)) {
1707 * We will disable all channels that do not match our
1708 * received regulatory rule unless the hint is coming
1709 * from a Country IE and the Country IE had no information
1710 * about a band. The IEEE 802.11 spec allows for an AP
1711 * to send only a subset of the regulatory rules allowed,
1712 * so an AP in the US that only supports 2.4 GHz may only send
1713 * a country IE with information for the 2.4 GHz band
1714 * while 5 GHz is still supported.
1716 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1717 PTR_ERR(reg_rule) == -ERANGE)
1720 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1721 request_wiphy && request_wiphy == wiphy &&
1722 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1723 pr_debug("Disabling freq %d MHz for good\n",
1725 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1726 chan->flags = chan->orig_flags;
1728 pr_debug("Disabling freq %d MHz\n",
1730 chan->flags |= IEEE80211_CHAN_DISABLED;
1735 regd = reg_get_regdomain(wiphy);
1737 power_rule = ®_rule->power_rule;
1738 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
1740 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1741 request_wiphy && request_wiphy == wiphy &&
1742 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1744 * This guarantees the driver's requested regulatory domain
1745 * will always be used as a base for further regulatory
1748 chan->flags = chan->orig_flags =
1749 map_regdom_flags(reg_rule->flags) | bw_flags;
1750 chan->max_antenna_gain = chan->orig_mag =
1751 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1752 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
1753 (int) MBM_TO_DBM(power_rule->max_eirp);
1755 if (chan->flags & IEEE80211_CHAN_RADAR) {
1756 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1757 if (reg_rule->dfs_cac_ms)
1758 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1764 chan->dfs_state = NL80211_DFS_USABLE;
1765 chan->dfs_state_entered = jiffies;
1767 chan->beacon_found = false;
1768 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1769 chan->max_antenna_gain =
1770 min_t(int, chan->orig_mag,
1771 MBI_TO_DBI(power_rule->max_antenna_gain));
1772 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1774 if (chan->flags & IEEE80211_CHAN_RADAR) {
1775 if (reg_rule->dfs_cac_ms)
1776 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1778 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1781 if (chan->orig_mpwr) {
1783 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1784 * will always follow the passed country IE power settings.
1786 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1787 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
1788 chan->max_power = chan->max_reg_power;
1790 chan->max_power = min(chan->orig_mpwr,
1791 chan->max_reg_power);
1793 chan->max_power = chan->max_reg_power;
1796 static void handle_band(struct wiphy *wiphy,
1797 enum nl80211_reg_initiator initiator,
1798 struct ieee80211_supported_band *sband)
1805 for (i = 0; i < sband->n_channels; i++)
1806 handle_channel(wiphy, initiator, &sband->channels[i]);
1809 static bool reg_request_cell_base(struct regulatory_request *request)
1811 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1813 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1816 bool reg_last_request_cell_base(void)
1818 return reg_request_cell_base(get_last_request());
1821 #ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
1822 /* Core specific check */
1823 static enum reg_request_treatment
1824 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1826 struct regulatory_request *lr = get_last_request();
1828 if (!reg_num_devs_support_basehint)
1829 return REG_REQ_IGNORE;
1831 if (reg_request_cell_base(lr) &&
1832 !regdom_changes(pending_request->alpha2))
1833 return REG_REQ_ALREADY_SET;
1838 /* Device specific check */
1839 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1841 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1844 static enum reg_request_treatment
1845 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1847 return REG_REQ_IGNORE;
1850 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1856 static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1858 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1859 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1864 static bool ignore_reg_update(struct wiphy *wiphy,
1865 enum nl80211_reg_initiator initiator)
1867 struct regulatory_request *lr = get_last_request();
1869 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
1873 pr_debug("Ignoring regulatory request set by %s since last_request is not set\n",
1874 reg_initiator_name(initiator));
1878 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1879 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1880 pr_debug("Ignoring regulatory request set by %s since the driver uses its own custom regulatory domain\n",
1881 reg_initiator_name(initiator));
1886 * wiphy->regd will be set once the device has its own
1887 * desired regulatory domain set
1889 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1890 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1891 !is_world_regdom(lr->alpha2)) {
1892 pr_debug("Ignoring regulatory request set by %s since the driver requires its own regulatory domain to be set first\n",
1893 reg_initiator_name(initiator));
1897 if (reg_request_cell_base(lr))
1898 return reg_dev_ignore_cell_hint(wiphy);
1903 static bool reg_is_world_roaming(struct wiphy *wiphy)
1905 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1906 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1907 struct regulatory_request *lr = get_last_request();
1909 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1912 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1913 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1919 static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1920 struct reg_beacon *reg_beacon)
1922 struct ieee80211_supported_band *sband;
1923 struct ieee80211_channel *chan;
1924 bool channel_changed = false;
1925 struct ieee80211_channel chan_before;
1927 sband = wiphy->bands[reg_beacon->chan.band];
1928 chan = &sband->channels[chan_idx];
1930 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1933 if (chan->beacon_found)
1936 chan->beacon_found = true;
1938 if (!reg_is_world_roaming(wiphy))
1941 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1944 chan_before = *chan;
1946 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1947 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1948 channel_changed = true;
1951 if (channel_changed)
1952 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1956 * Called when a scan on a wiphy finds a beacon on
1959 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1960 struct reg_beacon *reg_beacon)
1963 struct ieee80211_supported_band *sband;
1965 if (!wiphy->bands[reg_beacon->chan.band])
1968 sband = wiphy->bands[reg_beacon->chan.band];
1970 for (i = 0; i < sband->n_channels; i++)
1971 handle_reg_beacon(wiphy, i, reg_beacon);
1975 * Called upon reg changes or a new wiphy is added
1977 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1980 struct ieee80211_supported_band *sband;
1981 struct reg_beacon *reg_beacon;
1983 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1984 if (!wiphy->bands[reg_beacon->chan.band])
1986 sband = wiphy->bands[reg_beacon->chan.band];
1987 for (i = 0; i < sband->n_channels; i++)
1988 handle_reg_beacon(wiphy, i, reg_beacon);
1992 /* Reap the advantages of previously found beacons */
1993 static void reg_process_beacons(struct wiphy *wiphy)
1996 * Means we are just firing up cfg80211, so no beacons would
1997 * have been processed yet.
2001 wiphy_update_beacon_reg(wiphy);
2004 static bool is_ht40_allowed(struct ieee80211_channel *chan)
2008 if (chan->flags & IEEE80211_CHAN_DISABLED)
2010 /* This would happen when regulatory rules disallow HT40 completely */
2011 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
2016 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
2017 struct ieee80211_channel *channel)
2019 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
2020 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
2021 const struct ieee80211_regdomain *regd;
2025 if (!is_ht40_allowed(channel)) {
2026 channel->flags |= IEEE80211_CHAN_NO_HT40;
2031 * We need to ensure the extension channels exist to
2032 * be able to use HT40- or HT40+, this finds them (or not)
2034 for (i = 0; i < sband->n_channels; i++) {
2035 struct ieee80211_channel *c = &sband->channels[i];
2037 if (c->center_freq == (channel->center_freq - 20))
2039 if (c->center_freq == (channel->center_freq + 20))
2044 regd = get_wiphy_regdom(wiphy);
2046 const struct ieee80211_reg_rule *reg_rule =
2047 freq_reg_info_regd(MHZ_TO_KHZ(channel->center_freq),
2048 regd, MHZ_TO_KHZ(20));
2050 if (!IS_ERR(reg_rule))
2051 flags = reg_rule->flags;
2055 * Please note that this assumes target bandwidth is 20 MHz,
2056 * if that ever changes we also need to change the below logic
2057 * to include that as well.
2059 if (!is_ht40_allowed(channel_before) ||
2060 flags & NL80211_RRF_NO_HT40MINUS)
2061 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
2063 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
2065 if (!is_ht40_allowed(channel_after) ||
2066 flags & NL80211_RRF_NO_HT40PLUS)
2067 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
2069 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
2072 static void reg_process_ht_flags_band(struct wiphy *wiphy,
2073 struct ieee80211_supported_band *sband)
2080 for (i = 0; i < sband->n_channels; i++)
2081 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
2084 static void reg_process_ht_flags(struct wiphy *wiphy)
2086 enum nl80211_band band;
2091 for (band = 0; band < NUM_NL80211_BANDS; band++)
2092 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
2095 static void reg_call_notifier(struct wiphy *wiphy,
2096 struct regulatory_request *request)
2098 if (wiphy->reg_notifier)
2099 wiphy->reg_notifier(wiphy, request);
2102 static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
2104 struct cfg80211_chan_def chandef = {};
2105 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2106 enum nl80211_iftype iftype;
2109 iftype = wdev->iftype;
2111 /* make sure the interface is active */
2112 if (!wdev->netdev || !netif_running(wdev->netdev))
2113 goto wdev_inactive_unlock;
2116 case NL80211_IFTYPE_AP:
2117 case NL80211_IFTYPE_P2P_GO:
2118 if (!wdev->beacon_interval)
2119 goto wdev_inactive_unlock;
2120 chandef = wdev->chandef;
2122 case NL80211_IFTYPE_ADHOC:
2123 if (!wdev->ssid_len)
2124 goto wdev_inactive_unlock;
2125 chandef = wdev->chandef;
2127 case NL80211_IFTYPE_STATION:
2128 case NL80211_IFTYPE_P2P_CLIENT:
2129 if (!wdev->current_bss ||
2130 !wdev->current_bss->pub.channel)
2131 goto wdev_inactive_unlock;
2133 if (!rdev->ops->get_channel ||
2134 rdev_get_channel(rdev, wdev, &chandef))
2135 cfg80211_chandef_create(&chandef,
2136 wdev->current_bss->pub.channel,
2137 NL80211_CHAN_NO_HT);
2139 case NL80211_IFTYPE_MONITOR:
2140 case NL80211_IFTYPE_AP_VLAN:
2141 case NL80211_IFTYPE_P2P_DEVICE:
2142 /* no enforcement required */
2145 /* others not implemented for now */
2153 case NL80211_IFTYPE_AP:
2154 case NL80211_IFTYPE_P2P_GO:
2155 case NL80211_IFTYPE_ADHOC:
2156 return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
2157 case NL80211_IFTYPE_STATION:
2158 case NL80211_IFTYPE_P2P_CLIENT:
2159 return cfg80211_chandef_usable(wiphy, &chandef,
2160 IEEE80211_CHAN_DISABLED);
2167 wdev_inactive_unlock:
2172 static void reg_leave_invalid_chans(struct wiphy *wiphy)
2174 struct wireless_dev *wdev;
2175 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2179 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
2180 if (!reg_wdev_chan_valid(wiphy, wdev))
2181 cfg80211_leave(rdev, wdev);
2184 static void reg_check_chans_work(struct work_struct *work)
2186 struct cfg80211_registered_device *rdev;
2188 pr_debug("Verifying active interfaces after reg change\n");
2191 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
2192 if (!(rdev->wiphy.regulatory_flags &
2193 REGULATORY_IGNORE_STALE_KICKOFF))
2194 reg_leave_invalid_chans(&rdev->wiphy);
2199 static void reg_check_channels(void)
2202 * Give usermode a chance to do something nicer (move to another
2203 * channel, orderly disconnection), before forcing a disconnection.
2205 mod_delayed_work(system_power_efficient_wq,
2207 msecs_to_jiffies(REG_ENFORCE_GRACE_MS));
2210 static void wiphy_update_regulatory(struct wiphy *wiphy,
2211 enum nl80211_reg_initiator initiator)
2213 enum nl80211_band band;
2214 struct regulatory_request *lr = get_last_request();
2216 if (ignore_reg_update(wiphy, initiator)) {
2218 * Regulatory updates set by CORE are ignored for custom
2219 * regulatory cards. Let us notify the changes to the driver,
2220 * as some drivers used this to restore its orig_* reg domain.
2222 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
2223 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG &&
2224 !(wiphy->regulatory_flags &
2225 REGULATORY_WIPHY_SELF_MANAGED))
2226 reg_call_notifier(wiphy, lr);
2230 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
2232 for (band = 0; band < NUM_NL80211_BANDS; band++)
2233 handle_band(wiphy, initiator, wiphy->bands[band]);
2235 reg_process_beacons(wiphy);
2236 reg_process_ht_flags(wiphy);
2237 reg_call_notifier(wiphy, lr);
2240 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
2242 struct cfg80211_registered_device *rdev;
2243 struct wiphy *wiphy;
2247 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2248 wiphy = &rdev->wiphy;
2249 wiphy_update_regulatory(wiphy, initiator);
2252 reg_check_channels();
2255 static void handle_channel_custom(struct wiphy *wiphy,
2256 struct ieee80211_channel *chan,
2257 const struct ieee80211_regdomain *regd,
2261 const struct ieee80211_reg_rule *reg_rule = NULL;
2262 const struct ieee80211_power_rule *power_rule = NULL;
2265 for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
2266 reg_rule = freq_reg_info_regd(MHZ_TO_KHZ(chan->center_freq),
2268 if (!IS_ERR(reg_rule))
2272 if (IS_ERR_OR_NULL(reg_rule)) {
2273 pr_debug("Disabling freq %d MHz as custom regd has no rule that fits it\n",
2275 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
2276 chan->flags |= IEEE80211_CHAN_DISABLED;
2278 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
2279 chan->flags = chan->orig_flags;
2284 power_rule = ®_rule->power_rule;
2285 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
2287 chan->dfs_state_entered = jiffies;
2288 chan->dfs_state = NL80211_DFS_USABLE;
2290 chan->beacon_found = false;
2292 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
2293 chan->flags = chan->orig_flags | bw_flags |
2294 map_regdom_flags(reg_rule->flags);
2296 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
2298 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
2299 chan->max_reg_power = chan->max_power =
2300 (int) MBM_TO_DBM(power_rule->max_eirp);
2302 if (chan->flags & IEEE80211_CHAN_RADAR) {
2303 if (reg_rule->dfs_cac_ms)
2304 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
2306 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
2309 chan->max_power = chan->max_reg_power;
2312 static void handle_band_custom(struct wiphy *wiphy,
2313 struct ieee80211_supported_band *sband,
2314 const struct ieee80211_regdomain *regd)
2322 * We currently assume that you always want at least 20 MHz,
2323 * otherwise channel 12 might get enabled if this rule is
2324 * compatible to US, which permits 2402 - 2472 MHz.
2326 for (i = 0; i < sband->n_channels; i++)
2327 handle_channel_custom(wiphy, &sband->channels[i], regd,
2331 /* Used by drivers prior to wiphy registration */
2332 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
2333 const struct ieee80211_regdomain *regd)
2335 enum nl80211_band band;
2336 unsigned int bands_set = 0;
2338 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
2339 "wiphy should have REGULATORY_CUSTOM_REG\n");
2340 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
2342 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2343 if (!wiphy->bands[band])
2345 handle_band_custom(wiphy, wiphy->bands[band], regd);
2350 * no point in calling this if it won't have any effect
2351 * on your device's supported bands.
2353 WARN_ON(!bands_set);
2355 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
2357 static void reg_set_request_processed(void)
2359 bool need_more_processing = false;
2360 struct regulatory_request *lr = get_last_request();
2362 lr->processed = true;
2364 spin_lock(®_requests_lock);
2365 if (!list_empty(®_requests_list))
2366 need_more_processing = true;
2367 spin_unlock(®_requests_lock);
2369 cancel_crda_timeout();
2371 if (need_more_processing)
2372 schedule_work(®_work);
2376 * reg_process_hint_core - process core regulatory requests
2377 * @pending_request: a pending core regulatory request
2379 * The wireless subsystem can use this function to process
2380 * a regulatory request issued by the regulatory core.
2382 static enum reg_request_treatment
2383 reg_process_hint_core(struct regulatory_request *core_request)
2385 if (reg_query_database(core_request)) {
2386 core_request->intersect = false;
2387 core_request->processed = false;
2388 reg_update_last_request(core_request);
2392 return REG_REQ_IGNORE;
2395 static enum reg_request_treatment
2396 __reg_process_hint_user(struct regulatory_request *user_request)
2398 struct regulatory_request *lr = get_last_request();
2400 if (reg_request_cell_base(user_request))
2401 return reg_ignore_cell_hint(user_request);
2403 if (reg_request_cell_base(lr))
2404 return REG_REQ_IGNORE;
2406 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
2407 return REG_REQ_INTERSECT;
2409 * If the user knows better the user should set the regdom
2410 * to their country before the IE is picked up
2412 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
2414 return REG_REQ_IGNORE;
2416 * Process user requests only after previous user/driver/core
2417 * requests have been processed
2419 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
2420 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2421 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
2422 regdom_changes(lr->alpha2))
2423 return REG_REQ_IGNORE;
2425 if (!regdom_changes(user_request->alpha2))
2426 return REG_REQ_ALREADY_SET;
2432 * reg_process_hint_user - process user regulatory requests
2433 * @user_request: a pending user regulatory request
2435 * The wireless subsystem can use this function to process
2436 * a regulatory request initiated by userspace.
2438 static enum reg_request_treatment
2439 reg_process_hint_user(struct regulatory_request *user_request)
2441 enum reg_request_treatment treatment;
2443 treatment = __reg_process_hint_user(user_request);
2444 if (treatment == REG_REQ_IGNORE ||
2445 treatment == REG_REQ_ALREADY_SET)
2446 return REG_REQ_IGNORE;
2448 user_request->intersect = treatment == REG_REQ_INTERSECT;
2449 user_request->processed = false;
2451 if (reg_query_database(user_request)) {
2452 reg_update_last_request(user_request);
2453 user_alpha2[0] = user_request->alpha2[0];
2454 user_alpha2[1] = user_request->alpha2[1];
2458 return REG_REQ_IGNORE;
2461 static enum reg_request_treatment
2462 __reg_process_hint_driver(struct regulatory_request *driver_request)
2464 struct regulatory_request *lr = get_last_request();
2466 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
2467 if (regdom_changes(driver_request->alpha2))
2469 return REG_REQ_ALREADY_SET;
2473 * This would happen if you unplug and plug your card
2474 * back in or if you add a new device for which the previously
2475 * loaded card also agrees on the regulatory domain.
2477 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
2478 !regdom_changes(driver_request->alpha2))
2479 return REG_REQ_ALREADY_SET;
2481 return REG_REQ_INTERSECT;
2485 * reg_process_hint_driver - process driver regulatory requests
2486 * @driver_request: a pending driver regulatory request
2488 * The wireless subsystem can use this function to process
2489 * a regulatory request issued by an 802.11 driver.
2491 * Returns one of the different reg request treatment values.
2493 static enum reg_request_treatment
2494 reg_process_hint_driver(struct wiphy *wiphy,
2495 struct regulatory_request *driver_request)
2497 const struct ieee80211_regdomain *regd, *tmp;
2498 enum reg_request_treatment treatment;
2500 treatment = __reg_process_hint_driver(driver_request);
2502 switch (treatment) {
2505 case REG_REQ_IGNORE:
2506 return REG_REQ_IGNORE;
2507 case REG_REQ_INTERSECT:
2508 case REG_REQ_ALREADY_SET:
2509 regd = reg_copy_regd(get_cfg80211_regdom());
2511 return REG_REQ_IGNORE;
2513 tmp = get_wiphy_regdom(wiphy);
2514 rcu_assign_pointer(wiphy->regd, regd);
2515 rcu_free_regdom(tmp);
2519 driver_request->intersect = treatment == REG_REQ_INTERSECT;
2520 driver_request->processed = false;
2523 * Since CRDA will not be called in this case as we already
2524 * have applied the requested regulatory domain before we just
2525 * inform userspace we have processed the request
2527 if (treatment == REG_REQ_ALREADY_SET) {
2528 nl80211_send_reg_change_event(driver_request);
2529 reg_update_last_request(driver_request);
2530 reg_set_request_processed();
2531 return REG_REQ_ALREADY_SET;
2534 if (reg_query_database(driver_request)) {
2535 reg_update_last_request(driver_request);
2539 return REG_REQ_IGNORE;
2542 static enum reg_request_treatment
2543 __reg_process_hint_country_ie(struct wiphy *wiphy,
2544 struct regulatory_request *country_ie_request)
2546 struct wiphy *last_wiphy = NULL;
2547 struct regulatory_request *lr = get_last_request();
2549 if (reg_request_cell_base(lr)) {
2550 /* Trust a Cell base station over the AP's country IE */
2551 if (regdom_changes(country_ie_request->alpha2))
2552 return REG_REQ_IGNORE;
2553 return REG_REQ_ALREADY_SET;
2555 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
2556 return REG_REQ_IGNORE;
2559 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
2562 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
2565 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2567 if (last_wiphy != wiphy) {
2569 * Two cards with two APs claiming different
2570 * Country IE alpha2s. We could
2571 * intersect them, but that seems unlikely
2572 * to be correct. Reject second one for now.
2574 if (regdom_changes(country_ie_request->alpha2))
2575 return REG_REQ_IGNORE;
2576 return REG_REQ_ALREADY_SET;
2579 if (regdom_changes(country_ie_request->alpha2))
2581 return REG_REQ_ALREADY_SET;
2585 * reg_process_hint_country_ie - process regulatory requests from country IEs
2586 * @country_ie_request: a regulatory request from a country IE
2588 * The wireless subsystem can use this function to process
2589 * a regulatory request issued by a country Information Element.
2591 * Returns one of the different reg request treatment values.
2593 static enum reg_request_treatment
2594 reg_process_hint_country_ie(struct wiphy *wiphy,
2595 struct regulatory_request *country_ie_request)
2597 enum reg_request_treatment treatment;
2599 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
2601 switch (treatment) {
2604 case REG_REQ_IGNORE:
2605 return REG_REQ_IGNORE;
2606 case REG_REQ_ALREADY_SET:
2607 reg_free_request(country_ie_request);
2608 return REG_REQ_ALREADY_SET;
2609 case REG_REQ_INTERSECT:
2611 * This doesn't happen yet, not sure we
2612 * ever want to support it for this case.
2614 WARN_ONCE(1, "Unexpected intersection for country elements");
2615 return REG_REQ_IGNORE;
2618 country_ie_request->intersect = false;
2619 country_ie_request->processed = false;
2621 if (reg_query_database(country_ie_request)) {
2622 reg_update_last_request(country_ie_request);
2626 return REG_REQ_IGNORE;
2629 bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2)
2631 const struct ieee80211_regdomain *wiphy1_regd = NULL;
2632 const struct ieee80211_regdomain *wiphy2_regd = NULL;
2633 const struct ieee80211_regdomain *cfg80211_regd = NULL;
2634 bool dfs_domain_same;
2638 cfg80211_regd = rcu_dereference(cfg80211_regdomain);
2639 wiphy1_regd = rcu_dereference(wiphy1->regd);
2641 wiphy1_regd = cfg80211_regd;
2643 wiphy2_regd = rcu_dereference(wiphy2->regd);
2645 wiphy2_regd = cfg80211_regd;
2647 dfs_domain_same = wiphy1_regd->dfs_region == wiphy2_regd->dfs_region;
2651 return dfs_domain_same;
2654 static void reg_copy_dfs_chan_state(struct ieee80211_channel *dst_chan,
2655 struct ieee80211_channel *src_chan)
2657 if (!(dst_chan->flags & IEEE80211_CHAN_RADAR) ||
2658 !(src_chan->flags & IEEE80211_CHAN_RADAR))
2661 if (dst_chan->flags & IEEE80211_CHAN_DISABLED ||
2662 src_chan->flags & IEEE80211_CHAN_DISABLED)
2665 if (src_chan->center_freq == dst_chan->center_freq &&
2666 dst_chan->dfs_state == NL80211_DFS_USABLE) {
2667 dst_chan->dfs_state = src_chan->dfs_state;
2668 dst_chan->dfs_state_entered = src_chan->dfs_state_entered;
2672 static void wiphy_share_dfs_chan_state(struct wiphy *dst_wiphy,
2673 struct wiphy *src_wiphy)
2675 struct ieee80211_supported_band *src_sband, *dst_sband;
2676 struct ieee80211_channel *src_chan, *dst_chan;
2679 if (!reg_dfs_domain_same(dst_wiphy, src_wiphy))
2682 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2683 dst_sband = dst_wiphy->bands[band];
2684 src_sband = src_wiphy->bands[band];
2685 if (!dst_sband || !src_sband)
2688 for (i = 0; i < dst_sband->n_channels; i++) {
2689 dst_chan = &dst_sband->channels[i];
2690 for (j = 0; j < src_sband->n_channels; j++) {
2691 src_chan = &src_sband->channels[j];
2692 reg_copy_dfs_chan_state(dst_chan, src_chan);
2698 static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy)
2700 struct cfg80211_registered_device *rdev;
2704 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2705 if (wiphy == &rdev->wiphy)
2707 wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy);
2711 /* This processes *all* regulatory hints */
2712 static void reg_process_hint(struct regulatory_request *reg_request)
2714 struct wiphy *wiphy = NULL;
2715 enum reg_request_treatment treatment;
2716 enum nl80211_reg_initiator initiator = reg_request->initiator;
2718 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
2719 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
2721 switch (initiator) {
2722 case NL80211_REGDOM_SET_BY_CORE:
2723 treatment = reg_process_hint_core(reg_request);
2725 case NL80211_REGDOM_SET_BY_USER:
2726 treatment = reg_process_hint_user(reg_request);
2728 case NL80211_REGDOM_SET_BY_DRIVER:
2731 treatment = reg_process_hint_driver(wiphy, reg_request);
2733 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2736 treatment = reg_process_hint_country_ie(wiphy, reg_request);
2739 WARN(1, "invalid initiator %d\n", initiator);
2743 if (treatment == REG_REQ_IGNORE)
2746 WARN(treatment != REG_REQ_OK && treatment != REG_REQ_ALREADY_SET,
2747 "unexpected treatment value %d\n", treatment);
2749 /* This is required so that the orig_* parameters are saved.
2750 * NOTE: treatment must be set for any case that reaches here!
2752 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
2753 wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
2754 wiphy_update_regulatory(wiphy, initiator);
2755 wiphy_all_share_dfs_chan_state(wiphy);
2756 reg_check_channels();
2762 reg_free_request(reg_request);
2765 static void notify_self_managed_wiphys(struct regulatory_request *request)
2767 struct cfg80211_registered_device *rdev;
2768 struct wiphy *wiphy;
2770 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2771 wiphy = &rdev->wiphy;
2772 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED &&
2773 request->initiator == NL80211_REGDOM_SET_BY_USER &&
2774 request->user_reg_hint_type ==
2775 NL80211_USER_REG_HINT_CELL_BASE)
2776 reg_call_notifier(wiphy, request);
2781 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
2782 * Regulatory hints come on a first come first serve basis and we
2783 * must process each one atomically.
2785 static void reg_process_pending_hints(void)
2787 struct regulatory_request *reg_request, *lr;
2789 lr = get_last_request();
2791 /* When last_request->processed becomes true this will be rescheduled */
2792 if (lr && !lr->processed) {
2793 pr_debug("Pending regulatory request, waiting for it to be processed...\n");
2797 spin_lock(®_requests_lock);
2799 if (list_empty(®_requests_list)) {
2800 spin_unlock(®_requests_lock);
2804 reg_request = list_first_entry(®_requests_list,
2805 struct regulatory_request,
2807 list_del_init(®_request->list);
2809 spin_unlock(®_requests_lock);
2811 notify_self_managed_wiphys(reg_request);
2813 reg_process_hint(reg_request);
2815 lr = get_last_request();
2817 spin_lock(®_requests_lock);
2818 if (!list_empty(®_requests_list) && lr && lr->processed)
2819 schedule_work(®_work);
2820 spin_unlock(®_requests_lock);
2823 /* Processes beacon hints -- this has nothing to do with country IEs */
2824 static void reg_process_pending_beacon_hints(void)
2826 struct cfg80211_registered_device *rdev;
2827 struct reg_beacon *pending_beacon, *tmp;
2829 /* This goes through the _pending_ beacon list */
2830 spin_lock_bh(®_pending_beacons_lock);
2832 list_for_each_entry_safe(pending_beacon, tmp,
2833 ®_pending_beacons, list) {
2834 list_del_init(&pending_beacon->list);
2836 /* Applies the beacon hint to current wiphys */
2837 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
2838 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
2840 /* Remembers the beacon hint for new wiphys or reg changes */
2841 list_add_tail(&pending_beacon->list, ®_beacon_list);
2844 spin_unlock_bh(®_pending_beacons_lock);
2847 static void reg_process_self_managed_hints(void)
2849 struct cfg80211_registered_device *rdev;
2850 struct wiphy *wiphy;
2851 const struct ieee80211_regdomain *tmp;
2852 const struct ieee80211_regdomain *regd;
2853 enum nl80211_band band;
2854 struct regulatory_request request = {};
2856 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2857 wiphy = &rdev->wiphy;
2859 spin_lock(®_requests_lock);
2860 regd = rdev->requested_regd;
2861 rdev->requested_regd = NULL;
2862 spin_unlock(®_requests_lock);
2867 tmp = get_wiphy_regdom(wiphy);
2868 rcu_assign_pointer(wiphy->regd, regd);
2869 rcu_free_regdom(tmp);
2871 for (band = 0; band < NUM_NL80211_BANDS; band++)
2872 handle_band_custom(wiphy, wiphy->bands[band], regd);
2874 reg_process_ht_flags(wiphy);
2876 request.wiphy_idx = get_wiphy_idx(wiphy);
2877 request.alpha2[0] = regd->alpha2[0];
2878 request.alpha2[1] = regd->alpha2[1];
2879 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
2881 nl80211_send_wiphy_reg_change_event(&request);
2884 reg_check_channels();
2887 static void reg_todo(struct work_struct *work)
2890 reg_process_pending_hints();
2891 reg_process_pending_beacon_hints();
2892 reg_process_self_managed_hints();
2896 static void queue_regulatory_request(struct regulatory_request *request)
2898 request->alpha2[0] = toupper(request->alpha2[0]);
2899 request->alpha2[1] = toupper(request->alpha2[1]);
2901 spin_lock(®_requests_lock);
2902 list_add_tail(&request->list, ®_requests_list);
2903 spin_unlock(®_requests_lock);
2905 schedule_work(®_work);
2909 * Core regulatory hint -- happens during cfg80211_init()
2910 * and when we restore regulatory settings.
2912 static int regulatory_hint_core(const char *alpha2)
2914 struct regulatory_request *request;
2916 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2920 request->alpha2[0] = alpha2[0];
2921 request->alpha2[1] = alpha2[1];
2922 request->initiator = NL80211_REGDOM_SET_BY_CORE;
2923 request->wiphy_idx = WIPHY_IDX_INVALID;
2925 queue_regulatory_request(request);
2931 int regulatory_hint_user(const char *alpha2,
2932 enum nl80211_user_reg_hint_type user_reg_hint_type)
2934 struct regulatory_request *request;
2936 if (WARN_ON(!alpha2))
2939 if (!is_world_regdom(alpha2) && !is_an_alpha2(alpha2))
2942 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2946 request->wiphy_idx = WIPHY_IDX_INVALID;
2947 request->alpha2[0] = alpha2[0];
2948 request->alpha2[1] = alpha2[1];
2949 request->initiator = NL80211_REGDOM_SET_BY_USER;
2950 request->user_reg_hint_type = user_reg_hint_type;
2952 /* Allow calling CRDA again */
2953 reset_crda_timeouts();
2955 queue_regulatory_request(request);
2960 int regulatory_hint_indoor(bool is_indoor, u32 portid)
2962 spin_lock(®_indoor_lock);
2964 /* It is possible that more than one user space process is trying to
2965 * configure the indoor setting. To handle such cases, clear the indoor
2966 * setting in case that some process does not think that the device
2967 * is operating in an indoor environment. In addition, if a user space
2968 * process indicates that it is controlling the indoor setting, save its
2969 * portid, i.e., make it the owner.
2971 reg_is_indoor = is_indoor;
2972 if (reg_is_indoor) {
2973 if (!reg_is_indoor_portid)
2974 reg_is_indoor_portid = portid;
2976 reg_is_indoor_portid = 0;
2979 spin_unlock(®_indoor_lock);
2982 reg_check_channels();
2987 void regulatory_netlink_notify(u32 portid)
2989 spin_lock(®_indoor_lock);
2991 if (reg_is_indoor_portid != portid) {
2992 spin_unlock(®_indoor_lock);
2996 reg_is_indoor = false;
2997 reg_is_indoor_portid = 0;
2999 spin_unlock(®_indoor_lock);
3001 reg_check_channels();
3005 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
3007 struct regulatory_request *request;
3009 if (WARN_ON(!alpha2 || !wiphy))
3012 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
3014 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
3018 request->wiphy_idx = get_wiphy_idx(wiphy);
3020 request->alpha2[0] = alpha2[0];
3021 request->alpha2[1] = alpha2[1];
3022 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
3024 /* Allow calling CRDA again */
3025 reset_crda_timeouts();
3027 queue_regulatory_request(request);
3031 EXPORT_SYMBOL(regulatory_hint);
3033 void regulatory_hint_country_ie(struct wiphy *wiphy, enum nl80211_band band,
3034 const u8 *country_ie, u8 country_ie_len)
3037 enum environment_cap env = ENVIRON_ANY;
3038 struct regulatory_request *request = NULL, *lr;
3040 /* IE len must be evenly divisible by 2 */
3041 if (country_ie_len & 0x01)
3044 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
3047 request = kzalloc(sizeof(*request), GFP_KERNEL);
3051 alpha2[0] = country_ie[0];
3052 alpha2[1] = country_ie[1];
3054 if (country_ie[2] == 'I')
3055 env = ENVIRON_INDOOR;
3056 else if (country_ie[2] == 'O')
3057 env = ENVIRON_OUTDOOR;
3060 lr = get_last_request();
3066 * We will run this only upon a successful connection on cfg80211.
3067 * We leave conflict resolution to the workqueue, where can hold
3070 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
3071 lr->wiphy_idx != WIPHY_IDX_INVALID)
3074 request->wiphy_idx = get_wiphy_idx(wiphy);
3075 request->alpha2[0] = alpha2[0];
3076 request->alpha2[1] = alpha2[1];
3077 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
3078 request->country_ie_env = env;
3080 /* Allow calling CRDA again */
3081 reset_crda_timeouts();
3083 queue_regulatory_request(request);
3090 static void restore_alpha2(char *alpha2, bool reset_user)
3092 /* indicates there is no alpha2 to consider for restoration */
3096 /* The user setting has precedence over the module parameter */
3097 if (is_user_regdom_saved()) {
3098 /* Unless we're asked to ignore it and reset it */
3100 pr_debug("Restoring regulatory settings including user preference\n");
3101 user_alpha2[0] = '9';
3102 user_alpha2[1] = '7';
3105 * If we're ignoring user settings, we still need to
3106 * check the module parameter to ensure we put things
3107 * back as they were for a full restore.
3109 if (!is_world_regdom(ieee80211_regdom)) {
3110 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
3111 ieee80211_regdom[0], ieee80211_regdom[1]);
3112 alpha2[0] = ieee80211_regdom[0];
3113 alpha2[1] = ieee80211_regdom[1];
3116 pr_debug("Restoring regulatory settings while preserving user preference for: %c%c\n",
3117 user_alpha2[0], user_alpha2[1]);
3118 alpha2[0] = user_alpha2[0];
3119 alpha2[1] = user_alpha2[1];
3121 } else if (!is_world_regdom(ieee80211_regdom)) {
3122 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
3123 ieee80211_regdom[0], ieee80211_regdom[1]);
3124 alpha2[0] = ieee80211_regdom[0];
3125 alpha2[1] = ieee80211_regdom[1];
3127 pr_debug("Restoring regulatory settings\n");
3130 static void restore_custom_reg_settings(struct wiphy *wiphy)
3132 struct ieee80211_supported_band *sband;
3133 enum nl80211_band band;
3134 struct ieee80211_channel *chan;
3137 for (band = 0; band < NUM_NL80211_BANDS; band++) {
3138 sband = wiphy->bands[band];
3141 for (i = 0; i < sband->n_channels; i++) {
3142 chan = &sband->channels[i];
3143 chan->flags = chan->orig_flags;
3144 chan->max_antenna_gain = chan->orig_mag;
3145 chan->max_power = chan->orig_mpwr;
3146 chan->beacon_found = false;
3152 * Restoring regulatory settings involves ingoring any
3153 * possibly stale country IE information and user regulatory
3154 * settings if so desired, this includes any beacon hints
3155 * learned as we could have traveled outside to another country
3156 * after disconnection. To restore regulatory settings we do
3157 * exactly what we did at bootup:
3159 * - send a core regulatory hint
3160 * - send a user regulatory hint if applicable
3162 * Device drivers that send a regulatory hint for a specific country
3163 * keep their own regulatory domain on wiphy->regd so that does does
3164 * not need to be remembered.
3166 static void restore_regulatory_settings(bool reset_user)
3169 char world_alpha2[2];
3170 struct reg_beacon *reg_beacon, *btmp;
3171 LIST_HEAD(tmp_reg_req_list);
3172 struct cfg80211_registered_device *rdev;
3177 * Clear the indoor setting in case that it is not controlled by user
3178 * space, as otherwise there is no guarantee that the device is still
3179 * operating in an indoor environment.
3181 spin_lock(®_indoor_lock);
3182 if (reg_is_indoor && !reg_is_indoor_portid) {
3183 reg_is_indoor = false;
3184 reg_check_channels();
3186 spin_unlock(®_indoor_lock);
3188 reset_regdomains(true, &world_regdom);
3189 restore_alpha2(alpha2, reset_user);
3192 * If there's any pending requests we simply
3193 * stash them to a temporary pending queue and
3194 * add then after we've restored regulatory
3197 spin_lock(®_requests_lock);
3198 list_splice_tail_init(®_requests_list, &tmp_reg_req_list);
3199 spin_unlock(®_requests_lock);
3201 /* Clear beacon hints */
3202 spin_lock_bh(®_pending_beacons_lock);
3203 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
3204 list_del(®_beacon->list);
3207 spin_unlock_bh(®_pending_beacons_lock);
3209 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
3210 list_del(®_beacon->list);
3214 /* First restore to the basic regulatory settings */
3215 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
3216 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
3218 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
3219 if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
3221 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
3222 restore_custom_reg_settings(&rdev->wiphy);
3225 regulatory_hint_core(world_alpha2);
3228 * This restores the ieee80211_regdom module parameter
3229 * preference or the last user requested regulatory
3230 * settings, user regulatory settings takes precedence.
3232 if (is_an_alpha2(alpha2))
3233 regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER);
3235 spin_lock(®_requests_lock);
3236 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
3237 spin_unlock(®_requests_lock);
3239 pr_debug("Kicking the queue\n");
3241 schedule_work(®_work);
3244 static bool is_wiphy_all_set_reg_flag(enum ieee80211_regulatory_flags flag)
3246 struct cfg80211_registered_device *rdev;
3247 struct wireless_dev *wdev;
3249 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
3250 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
3252 if (!(wdev->wiphy->regulatory_flags & flag)) {
3263 void regulatory_hint_disconnect(void)
3265 /* Restore of regulatory settings is not required when wiphy(s)
3266 * ignore IE from connected access point but clearance of beacon hints
3267 * is required when wiphy(s) supports beacon hints.
3269 if (is_wiphy_all_set_reg_flag(REGULATORY_COUNTRY_IE_IGNORE)) {
3270 struct reg_beacon *reg_beacon, *btmp;
3272 if (is_wiphy_all_set_reg_flag(REGULATORY_DISABLE_BEACON_HINTS))
3275 spin_lock_bh(®_pending_beacons_lock);
3276 list_for_each_entry_safe(reg_beacon, btmp,
3277 ®_pending_beacons, list) {
3278 list_del(®_beacon->list);
3281 spin_unlock_bh(®_pending_beacons_lock);
3283 list_for_each_entry_safe(reg_beacon, btmp,
3284 ®_beacon_list, list) {
3285 list_del(®_beacon->list);
3292 pr_debug("All devices are disconnected, going to restore regulatory settings\n");
3293 restore_regulatory_settings(false);
3296 static bool freq_is_chan_12_13_14(u16 freq)
3298 if (freq == ieee80211_channel_to_frequency(12, NL80211_BAND_2GHZ) ||
3299 freq == ieee80211_channel_to_frequency(13, NL80211_BAND_2GHZ) ||
3300 freq == ieee80211_channel_to_frequency(14, NL80211_BAND_2GHZ))
3305 static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
3307 struct reg_beacon *pending_beacon;
3309 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
3310 if (beacon_chan->center_freq ==
3311 pending_beacon->chan.center_freq)
3316 int regulatory_hint_found_beacon(struct wiphy *wiphy,
3317 struct ieee80211_channel *beacon_chan,
3320 struct reg_beacon *reg_beacon;
3323 if (beacon_chan->beacon_found ||
3324 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
3325 (beacon_chan->band == NL80211_BAND_2GHZ &&
3326 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
3329 spin_lock_bh(®_pending_beacons_lock);
3330 processing = pending_reg_beacon(beacon_chan);
3331 spin_unlock_bh(®_pending_beacons_lock);
3336 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
3340 pr_debug("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
3341 beacon_chan->center_freq,
3342 ieee80211_frequency_to_channel(beacon_chan->center_freq),
3345 memcpy(®_beacon->chan, beacon_chan,
3346 sizeof(struct ieee80211_channel));
3349 * Since we can be called from BH or and non-BH context
3350 * we must use spin_lock_bh()
3352 spin_lock_bh(®_pending_beacons_lock);
3353 list_add_tail(®_beacon->list, ®_pending_beacons);
3354 spin_unlock_bh(®_pending_beacons_lock);
3356 schedule_work(®_work);
3361 static void print_rd_rules(const struct ieee80211_regdomain *rd)
3364 const struct ieee80211_reg_rule *reg_rule = NULL;
3365 const struct ieee80211_freq_range *freq_range = NULL;
3366 const struct ieee80211_power_rule *power_rule = NULL;
3367 char bw[32], cac_time[32];
3369 pr_debug(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
3371 for (i = 0; i < rd->n_reg_rules; i++) {
3372 reg_rule = &rd->reg_rules[i];
3373 freq_range = ®_rule->freq_range;
3374 power_rule = ®_rule->power_rule;
3376 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
3377 snprintf(bw, sizeof(bw), "%d KHz, %u KHz AUTO",
3378 freq_range->max_bandwidth_khz,
3379 reg_get_max_bandwidth(rd, reg_rule));
3381 snprintf(bw, sizeof(bw), "%d KHz",
3382 freq_range->max_bandwidth_khz);
3384 if (reg_rule->flags & NL80211_RRF_DFS)
3385 scnprintf(cac_time, sizeof(cac_time), "%u s",
3386 reg_rule->dfs_cac_ms/1000);
3388 scnprintf(cac_time, sizeof(cac_time), "N/A");
3392 * There may not be documentation for max antenna gain
3393 * in certain regions
3395 if (power_rule->max_antenna_gain)
3396 pr_debug(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
3397 freq_range->start_freq_khz,
3398 freq_range->end_freq_khz,
3400 power_rule->max_antenna_gain,
3401 power_rule->max_eirp,
3404 pr_debug(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
3405 freq_range->start_freq_khz,
3406 freq_range->end_freq_khz,
3408 power_rule->max_eirp,
3413 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
3415 switch (dfs_region) {
3416 case NL80211_DFS_UNSET:
3417 case NL80211_DFS_FCC:
3418 case NL80211_DFS_ETSI:
3419 case NL80211_DFS_JP:
3422 pr_debug("Ignoring unknown DFS master region: %d\n", dfs_region);
3427 static void print_regdomain(const struct ieee80211_regdomain *rd)
3429 struct regulatory_request *lr = get_last_request();
3431 if (is_intersected_alpha2(rd->alpha2)) {
3432 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
3433 struct cfg80211_registered_device *rdev;
3434 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
3436 pr_debug("Current regulatory domain updated by AP to: %c%c\n",
3437 rdev->country_ie_alpha2[0],
3438 rdev->country_ie_alpha2[1]);
3440 pr_debug("Current regulatory domain intersected:\n");
3442 pr_debug("Current regulatory domain intersected:\n");
3443 } else if (is_world_regdom(rd->alpha2)) {
3444 pr_debug("World regulatory domain updated:\n");
3446 if (is_unknown_alpha2(rd->alpha2))
3447 pr_debug("Regulatory domain changed to driver built-in settings (unknown country)\n");
3449 if (reg_request_cell_base(lr))
3450 pr_debug("Regulatory domain changed to country: %c%c by Cell Station\n",
3451 rd->alpha2[0], rd->alpha2[1]);
3453 pr_debug("Regulatory domain changed to country: %c%c\n",
3454 rd->alpha2[0], rd->alpha2[1]);
3458 pr_debug(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
3462 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
3464 pr_debug("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
3468 static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
3470 if (!is_world_regdom(rd->alpha2))
3472 update_world_regdomain(rd);
3476 static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
3477 struct regulatory_request *user_request)
3479 const struct ieee80211_regdomain *intersected_rd = NULL;
3481 if (!regdom_changes(rd->alpha2))
3484 if (!is_valid_rd(rd)) {
3485 pr_err("Invalid regulatory domain detected: %c%c\n",
3486 rd->alpha2[0], rd->alpha2[1]);
3487 print_regdomain_info(rd);
3491 if (!user_request->intersect) {
3492 reset_regdomains(false, rd);
3496 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
3497 if (!intersected_rd)
3502 reset_regdomains(false, intersected_rd);
3507 static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
3508 struct regulatory_request *driver_request)
3510 const struct ieee80211_regdomain *regd;
3511 const struct ieee80211_regdomain *intersected_rd = NULL;
3512 const struct ieee80211_regdomain *tmp;
3513 struct wiphy *request_wiphy;
3515 if (is_world_regdom(rd->alpha2))
3518 if (!regdom_changes(rd->alpha2))
3521 if (!is_valid_rd(rd)) {
3522 pr_err("Invalid regulatory domain detected: %c%c\n",
3523 rd->alpha2[0], rd->alpha2[1]);
3524 print_regdomain_info(rd);
3528 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
3532 if (!driver_request->intersect) {
3533 if (request_wiphy->regd)
3536 regd = reg_copy_regd(rd);
3538 return PTR_ERR(regd);
3540 rcu_assign_pointer(request_wiphy->regd, regd);
3541 reset_regdomains(false, rd);
3545 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
3546 if (!intersected_rd)
3550 * We can trash what CRDA provided now.
3551 * However if a driver requested this specific regulatory
3552 * domain we keep it for its private use
3554 tmp = get_wiphy_regdom(request_wiphy);
3555 rcu_assign_pointer(request_wiphy->regd, rd);
3556 rcu_free_regdom(tmp);
3560 reset_regdomains(false, intersected_rd);
3565 static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
3566 struct regulatory_request *country_ie_request)
3568 struct wiphy *request_wiphy;
3570 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
3571 !is_unknown_alpha2(rd->alpha2))
3575 * Lets only bother proceeding on the same alpha2 if the current
3576 * rd is non static (it means CRDA was present and was used last)
3577 * and the pending request came in from a country IE
3580 if (!is_valid_rd(rd)) {
3581 pr_err("Invalid regulatory domain detected: %c%c\n",
3582 rd->alpha2[0], rd->alpha2[1]);
3583 print_regdomain_info(rd);
3587 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
3591 if (country_ie_request->intersect)
3594 reset_regdomains(false, rd);
3599 * Use this call to set the current regulatory domain. Conflicts with
3600 * multiple drivers can be ironed out later. Caller must've already
3601 * kmalloc'd the rd structure.
3603 int set_regdom(const struct ieee80211_regdomain *rd,
3604 enum ieee80211_regd_source regd_src)
3606 struct regulatory_request *lr;
3607 bool user_reset = false;
3610 if (!reg_is_valid_request(rd->alpha2)) {
3615 if (regd_src == REGD_SOURCE_CRDA)
3616 reset_crda_timeouts();
3618 lr = get_last_request();
3620 /* Note that this doesn't update the wiphys, this is done below */
3621 switch (lr->initiator) {
3622 case NL80211_REGDOM_SET_BY_CORE:
3623 r = reg_set_rd_core(rd);
3625 case NL80211_REGDOM_SET_BY_USER:
3626 r = reg_set_rd_user(rd, lr);
3629 case NL80211_REGDOM_SET_BY_DRIVER:
3630 r = reg_set_rd_driver(rd, lr);
3632 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
3633 r = reg_set_rd_country_ie(rd, lr);
3636 WARN(1, "invalid initiator %d\n", lr->initiator);
3644 reg_set_request_processed();
3647 /* Back to world regulatory in case of errors */
3648 restore_regulatory_settings(user_reset);
3655 /* This would make this whole thing pointless */
3656 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
3659 /* update all wiphys now with the new established regulatory domain */
3660 update_all_wiphy_regulatory(lr->initiator);
3662 print_regdomain(get_cfg80211_regdom());
3664 nl80211_send_reg_change_event(lr);
3666 reg_set_request_processed();
3671 static int __regulatory_set_wiphy_regd(struct wiphy *wiphy,
3672 struct ieee80211_regdomain *rd)
3674 const struct ieee80211_regdomain *regd;
3675 const struct ieee80211_regdomain *prev_regd;
3676 struct cfg80211_registered_device *rdev;
3678 if (WARN_ON(!wiphy || !rd))
3681 if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED),
3682 "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n"))
3685 if (WARN(!is_valid_rd(rd), "Invalid regulatory domain detected\n")) {
3686 print_regdomain_info(rd);
3690 regd = reg_copy_regd(rd);
3692 return PTR_ERR(regd);
3694 rdev = wiphy_to_rdev(wiphy);
3696 spin_lock(®_requests_lock);
3697 prev_regd = rdev->requested_regd;
3698 rdev->requested_regd = regd;
3699 spin_unlock(®_requests_lock);
3705 int regulatory_set_wiphy_regd(struct wiphy *wiphy,
3706 struct ieee80211_regdomain *rd)
3708 int ret = __regulatory_set_wiphy_regd(wiphy, rd);
3713 schedule_work(®_work);
3716 EXPORT_SYMBOL(regulatory_set_wiphy_regd);
3718 int regulatory_set_wiphy_regd_sync_rtnl(struct wiphy *wiphy,
3719 struct ieee80211_regdomain *rd)
3725 ret = __regulatory_set_wiphy_regd(wiphy, rd);
3729 /* process the request immediately */
3730 reg_process_self_managed_hints();
3733 EXPORT_SYMBOL(regulatory_set_wiphy_regd_sync_rtnl);
3735 void wiphy_regulatory_register(struct wiphy *wiphy)
3737 struct regulatory_request *lr = get_last_request();
3739 /* self-managed devices ignore beacon hints and country IE */
3740 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
3741 wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS |
3742 REGULATORY_COUNTRY_IE_IGNORE;
3745 * The last request may have been received before this
3746 * registration call. Call the driver notifier if
3747 * initiator is USER and user type is CELL_BASE.
3749 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
3750 lr->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE)
3751 reg_call_notifier(wiphy, lr);
3754 if (!reg_dev_ignore_cell_hint(wiphy))
3755 reg_num_devs_support_basehint++;
3757 wiphy_update_regulatory(wiphy, lr->initiator);
3758 wiphy_all_share_dfs_chan_state(wiphy);
3761 void wiphy_regulatory_deregister(struct wiphy *wiphy)
3763 struct wiphy *request_wiphy = NULL;
3764 struct regulatory_request *lr;
3766 lr = get_last_request();
3768 if (!reg_dev_ignore_cell_hint(wiphy))
3769 reg_num_devs_support_basehint--;
3771 rcu_free_regdom(get_wiphy_regdom(wiphy));
3772 RCU_INIT_POINTER(wiphy->regd, NULL);
3775 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
3777 if (!request_wiphy || request_wiphy != wiphy)
3780 lr->wiphy_idx = WIPHY_IDX_INVALID;
3781 lr->country_ie_env = ENVIRON_ANY;
3785 * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for
3786 * UNII band definitions
3788 int cfg80211_get_unii(int freq)
3791 if (freq >= 5150 && freq <= 5250)
3795 if (freq > 5250 && freq <= 5350)
3799 if (freq > 5350 && freq <= 5470)
3803 if (freq > 5470 && freq <= 5725)
3807 if (freq > 5725 && freq <= 5825)
3813 bool regulatory_indoor_allowed(void)
3815 return reg_is_indoor;
3818 bool regulatory_pre_cac_allowed(struct wiphy *wiphy)
3820 const struct ieee80211_regdomain *regd = NULL;
3821 const struct ieee80211_regdomain *wiphy_regd = NULL;
3822 bool pre_cac_allowed = false;
3826 regd = rcu_dereference(cfg80211_regdomain);
3827 wiphy_regd = rcu_dereference(wiphy->regd);
3829 if (regd->dfs_region == NL80211_DFS_ETSI)
3830 pre_cac_allowed = true;
3834 return pre_cac_allowed;
3837 if (regd->dfs_region == wiphy_regd->dfs_region &&
3838 wiphy_regd->dfs_region == NL80211_DFS_ETSI)
3839 pre_cac_allowed = true;
3843 return pre_cac_allowed;
3846 static void cfg80211_check_and_end_cac(struct cfg80211_registered_device *rdev)
3848 struct wireless_dev *wdev;
3849 /* If we finished CAC or received radar, we should end any
3850 * CAC running on the same channels.
3851 * the check !cfg80211_chandef_dfs_usable contain 2 options:
3852 * either all channels are available - those the CAC_FINISHED
3853 * event has effected another wdev state, or there is a channel
3854 * in unavailable state in wdev chandef - those the RADAR_DETECTED
3855 * event has effected another wdev state.
3856 * In both cases we should end the CAC on the wdev.
3858 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
3859 if (wdev->cac_started &&
3860 !cfg80211_chandef_dfs_usable(&rdev->wiphy, &wdev->chandef))
3861 rdev_end_cac(rdev, wdev->netdev);
3865 void regulatory_propagate_dfs_state(struct wiphy *wiphy,
3866 struct cfg80211_chan_def *chandef,
3867 enum nl80211_dfs_state dfs_state,
3868 enum nl80211_radar_event event)
3870 struct cfg80211_registered_device *rdev;
3874 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
3877 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
3878 if (wiphy == &rdev->wiphy)
3881 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
3884 if (!ieee80211_get_channel(&rdev->wiphy,
3885 chandef->chan->center_freq))
3888 cfg80211_set_dfs_state(&rdev->wiphy, chandef, dfs_state);
3890 if (event == NL80211_RADAR_DETECTED ||
3891 event == NL80211_RADAR_CAC_FINISHED) {
3892 cfg80211_sched_dfs_chan_update(rdev);
3893 cfg80211_check_and_end_cac(rdev);
3896 nl80211_radar_notify(rdev, chandef, event, NULL, GFP_KERNEL);
3900 static int __init regulatory_init_db(void)
3905 * It's possible that - due to other bugs/issues - cfg80211
3906 * never called regulatory_init() below, or that it failed;
3907 * in that case, don't try to do any further work here as
3908 * it's doomed to lead to crashes.
3910 if (IS_ERR_OR_NULL(reg_pdev))
3913 err = load_builtin_regdb_keys();
3917 /* We always try to get an update for the static regdomain */
3918 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
3920 if (err == -ENOMEM) {
3921 platform_device_unregister(reg_pdev);
3925 * N.B. kobject_uevent_env() can fail mainly for when we're out
3926 * memory which is handled and propagated appropriately above
3927 * but it can also fail during a netlink_broadcast() or during
3928 * early boot for call_usermodehelper(). For now treat these
3929 * errors as non-fatal.
3931 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
3935 * Finally, if the user set the module parameter treat it
3938 if (!is_world_regdom(ieee80211_regdom))
3939 regulatory_hint_user(ieee80211_regdom,
3940 NL80211_USER_REG_HINT_USER);
3945 late_initcall(regulatory_init_db);
3948 int __init regulatory_init(void)
3950 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
3951 if (IS_ERR(reg_pdev))
3952 return PTR_ERR(reg_pdev);
3954 spin_lock_init(®_requests_lock);
3955 spin_lock_init(®_pending_beacons_lock);
3956 spin_lock_init(®_indoor_lock);
3958 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
3960 user_alpha2[0] = '9';
3961 user_alpha2[1] = '7';
3964 return regulatory_init_db();
3970 void regulatory_exit(void)
3972 struct regulatory_request *reg_request, *tmp;
3973 struct reg_beacon *reg_beacon, *btmp;
3975 cancel_work_sync(®_work);
3976 cancel_crda_timeout_sync();
3977 cancel_delayed_work_sync(®_check_chans);
3979 /* Lock to suppress warnings */
3981 reset_regdomains(true, NULL);
3984 dev_set_uevent_suppress(®_pdev->dev, true);
3986 platform_device_unregister(reg_pdev);
3988 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
3989 list_del(®_beacon->list);
3993 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
3994 list_del(®_beacon->list);
3998 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
3999 list_del(®_request->list);
4003 if (!IS_ERR_OR_NULL(regdb))
4006 free_regdb_keyring();