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(struct ieee80211_reg_rule *rrule,
851 struct fwdb_wmm_rule *wmm)
853 struct ieee80211_wmm_rule *rule = &rrule->wmm_rule;
856 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
857 rule->client[i].cw_min =
858 ecw2cw((wmm->client[i].ecw & 0xf0) >> 4);
859 rule->client[i].cw_max = ecw2cw(wmm->client[i].ecw & 0x0f);
860 rule->client[i].aifsn = wmm->client[i].aifsn;
861 rule->client[i].cot = 1000 * be16_to_cpu(wmm->client[i].cot);
862 rule->ap[i].cw_min = ecw2cw((wmm->ap[i].ecw & 0xf0) >> 4);
863 rule->ap[i].cw_max = ecw2cw(wmm->ap[i].ecw & 0x0f);
864 rule->ap[i].aifsn = wmm->ap[i].aifsn;
865 rule->ap[i].cot = 1000 * be16_to_cpu(wmm->ap[i].cot);
868 rrule->has_wmm = true;
871 static int __regdb_query_wmm(const struct fwdb_header *db,
872 const struct fwdb_country *country, int freq,
873 struct ieee80211_reg_rule *rule)
875 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
876 struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
879 for (i = 0; i < coll->n_rules; i++) {
880 __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
881 unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
882 struct fwdb_rule *rrule = (void *)((u8 *)db + rule_ptr);
883 struct fwdb_wmm_rule *wmm;
884 unsigned int wmm_ptr;
886 if (rrule->len < offsetofend(struct fwdb_rule, wmm_ptr))
889 if (freq >= KHZ_TO_MHZ(be32_to_cpu(rrule->start)) &&
890 freq <= KHZ_TO_MHZ(be32_to_cpu(rrule->end))) {
891 wmm_ptr = be16_to_cpu(rrule->wmm_ptr) << 2;
892 wmm = (void *)((u8 *)db + wmm_ptr);
893 set_wmm_rule(rule, wmm);
901 int reg_query_regdb_wmm(char *alpha2, int freq, struct ieee80211_reg_rule *rule)
903 const struct fwdb_header *hdr = regdb;
904 const struct fwdb_country *country;
910 return PTR_ERR(regdb);
912 country = &hdr->country[0];
913 while (country->coll_ptr) {
914 if (alpha2_equal(alpha2, country->alpha2))
915 return __regdb_query_wmm(regdb, country, freq, rule);
922 EXPORT_SYMBOL(reg_query_regdb_wmm);
924 static int regdb_query_country(const struct fwdb_header *db,
925 const struct fwdb_country *country)
927 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
928 struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
929 struct ieee80211_regdomain *regdom;
930 unsigned int size_of_regd, i;
932 size_of_regd = sizeof(struct ieee80211_regdomain) +
933 coll->n_rules * sizeof(struct ieee80211_reg_rule);
935 regdom = kzalloc(size_of_regd, GFP_KERNEL);
939 regdom->n_reg_rules = coll->n_rules;
940 regdom->alpha2[0] = country->alpha2[0];
941 regdom->alpha2[1] = country->alpha2[1];
942 regdom->dfs_region = coll->dfs_region;
944 for (i = 0; i < regdom->n_reg_rules; i++) {
945 __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
946 unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
947 struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
948 struct ieee80211_reg_rule *rrule = ®dom->reg_rules[i];
950 rrule->freq_range.start_freq_khz = be32_to_cpu(rule->start);
951 rrule->freq_range.end_freq_khz = be32_to_cpu(rule->end);
952 rrule->freq_range.max_bandwidth_khz = be32_to_cpu(rule->max_bw);
954 rrule->power_rule.max_antenna_gain = 0;
955 rrule->power_rule.max_eirp = be16_to_cpu(rule->max_eirp);
958 if (rule->flags & FWDB_FLAG_NO_OFDM)
959 rrule->flags |= NL80211_RRF_NO_OFDM;
960 if (rule->flags & FWDB_FLAG_NO_OUTDOOR)
961 rrule->flags |= NL80211_RRF_NO_OUTDOOR;
962 if (rule->flags & FWDB_FLAG_DFS)
963 rrule->flags |= NL80211_RRF_DFS;
964 if (rule->flags & FWDB_FLAG_NO_IR)
965 rrule->flags |= NL80211_RRF_NO_IR;
966 if (rule->flags & FWDB_FLAG_AUTO_BW)
967 rrule->flags |= NL80211_RRF_AUTO_BW;
969 rrule->dfs_cac_ms = 0;
971 /* handle optional data */
972 if (rule->len >= offsetofend(struct fwdb_rule, cac_timeout))
974 1000 * be16_to_cpu(rule->cac_timeout);
975 if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr)) {
976 u32 wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
977 struct fwdb_wmm_rule *wmm = (void *)((u8 *)db + wmm_ptr);
979 set_wmm_rule(rrule, wmm);
983 return reg_schedule_apply(regdom);
986 static int query_regdb(const char *alpha2)
988 const struct fwdb_header *hdr = regdb;
989 const struct fwdb_country *country;
994 return PTR_ERR(regdb);
996 country = &hdr->country[0];
997 while (country->coll_ptr) {
998 if (alpha2_equal(alpha2, country->alpha2))
999 return regdb_query_country(regdb, country);
1006 static void regdb_fw_cb(const struct firmware *fw, void *context)
1009 bool restore = true;
1013 pr_info("failed to load regulatory.db\n");
1014 set_error = -ENODATA;
1015 } else if (!valid_regdb(fw->data, fw->size)) {
1016 pr_info("loaded regulatory.db is malformed or signature is missing/invalid\n");
1017 set_error = -EINVAL;
1021 if (WARN_ON(regdb && !IS_ERR(regdb))) {
1022 /* just restore and free new db */
1023 } else if (set_error) {
1024 regdb = ERR_PTR(set_error);
1026 db = kmemdup(fw->data, fw->size, GFP_KERNEL);
1029 restore = context && query_regdb(context);
1036 restore_regulatory_settings(true);
1042 release_firmware(fw);
1045 static int query_regdb_file(const char *alpha2)
1050 return query_regdb(alpha2);
1052 alpha2 = kmemdup(alpha2, 2, GFP_KERNEL);
1056 return request_firmware_nowait(THIS_MODULE, true, "regulatory.db",
1057 ®_pdev->dev, GFP_KERNEL,
1058 (void *)alpha2, regdb_fw_cb);
1061 int reg_reload_regdb(void)
1063 const struct firmware *fw;
1067 err = request_firmware(&fw, "regulatory.db", ®_pdev->dev);
1071 if (!valid_regdb(fw->data, fw->size)) {
1076 db = kmemdup(fw->data, fw->size, GFP_KERNEL);
1083 if (!IS_ERR_OR_NULL(regdb))
1089 release_firmware(fw);
1093 static bool reg_query_database(struct regulatory_request *request)
1095 if (query_regdb_file(request->alpha2) == 0)
1098 if (call_crda(request->alpha2) == 0)
1104 bool reg_is_valid_request(const char *alpha2)
1106 struct regulatory_request *lr = get_last_request();
1108 if (!lr || lr->processed)
1111 return alpha2_equal(lr->alpha2, alpha2);
1114 static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
1116 struct regulatory_request *lr = get_last_request();
1119 * Follow the driver's regulatory domain, if present, unless a country
1120 * IE has been processed or a user wants to help complaince further
1122 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1123 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
1125 return get_wiphy_regdom(wiphy);
1127 return get_cfg80211_regdom();
1131 reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd,
1132 const struct ieee80211_reg_rule *rule)
1134 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
1135 const struct ieee80211_freq_range *freq_range_tmp;
1136 const struct ieee80211_reg_rule *tmp;
1137 u32 start_freq, end_freq, idx, no;
1139 for (idx = 0; idx < rd->n_reg_rules; idx++)
1140 if (rule == &rd->reg_rules[idx])
1143 if (idx == rd->n_reg_rules)
1146 /* get start_freq */
1150 tmp = &rd->reg_rules[--no];
1151 freq_range_tmp = &tmp->freq_range;
1153 if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
1156 freq_range = freq_range_tmp;
1159 start_freq = freq_range->start_freq_khz;
1162 freq_range = &rule->freq_range;
1165 while (no < rd->n_reg_rules - 1) {
1166 tmp = &rd->reg_rules[++no];
1167 freq_range_tmp = &tmp->freq_range;
1169 if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
1172 freq_range = freq_range_tmp;
1175 end_freq = freq_range->end_freq_khz;
1177 return end_freq - start_freq;
1180 unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
1181 const struct ieee80211_reg_rule *rule)
1183 unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule);
1185 if (rule->flags & NL80211_RRF_NO_160MHZ)
1186 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80));
1187 if (rule->flags & NL80211_RRF_NO_80MHZ)
1188 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40));
1191 * HT40+/HT40- limits are handled per-channel. Only limit BW if both
1194 if (rule->flags & NL80211_RRF_NO_HT40MINUS &&
1195 rule->flags & NL80211_RRF_NO_HT40PLUS)
1196 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20));
1201 /* Sanity check on a regulatory rule */
1202 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
1204 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
1207 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
1210 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
1213 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
1215 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
1216 freq_range->max_bandwidth_khz > freq_diff)
1222 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
1224 const struct ieee80211_reg_rule *reg_rule = NULL;
1227 if (!rd->n_reg_rules)
1230 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
1233 for (i = 0; i < rd->n_reg_rules; i++) {
1234 reg_rule = &rd->reg_rules[i];
1235 if (!is_valid_reg_rule(reg_rule))
1243 * freq_in_rule_band - tells us if a frequency is in a frequency band
1244 * @freq_range: frequency rule we want to query
1245 * @freq_khz: frequency we are inquiring about
1247 * This lets us know if a specific frequency rule is or is not relevant to
1248 * a specific frequency's band. Bands are device specific and artificial
1249 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
1250 * however it is safe for now to assume that a frequency rule should not be
1251 * part of a frequency's band if the start freq or end freq are off by more
1252 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
1254 * This resolution can be lowered and should be considered as we add
1255 * regulatory rule support for other "bands".
1257 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
1260 #define ONE_GHZ_IN_KHZ 1000000
1262 * From 802.11ad: directional multi-gigabit (DMG):
1263 * Pertaining to operation in a frequency band containing a channel
1264 * with the Channel starting frequency above 45 GHz.
1266 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
1267 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
1268 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
1270 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
1273 #undef ONE_GHZ_IN_KHZ
1277 * Later on we can perhaps use the more restrictive DFS
1278 * region but we don't have information for that yet so
1279 * for now simply disallow conflicts.
1281 static enum nl80211_dfs_regions
1282 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
1283 const enum nl80211_dfs_regions dfs_region2)
1285 if (dfs_region1 != dfs_region2)
1286 return NL80211_DFS_UNSET;
1291 * Helper for regdom_intersect(), this does the real
1292 * mathematical intersection fun
1294 static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
1295 const struct ieee80211_regdomain *rd2,
1296 const struct ieee80211_reg_rule *rule1,
1297 const struct ieee80211_reg_rule *rule2,
1298 struct ieee80211_reg_rule *intersected_rule)
1300 const struct ieee80211_freq_range *freq_range1, *freq_range2;
1301 struct ieee80211_freq_range *freq_range;
1302 const struct ieee80211_power_rule *power_rule1, *power_rule2;
1303 struct ieee80211_power_rule *power_rule;
1304 u32 freq_diff, max_bandwidth1, max_bandwidth2;
1306 freq_range1 = &rule1->freq_range;
1307 freq_range2 = &rule2->freq_range;
1308 freq_range = &intersected_rule->freq_range;
1310 power_rule1 = &rule1->power_rule;
1311 power_rule2 = &rule2->power_rule;
1312 power_rule = &intersected_rule->power_rule;
1314 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
1315 freq_range2->start_freq_khz);
1316 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
1317 freq_range2->end_freq_khz);
1319 max_bandwidth1 = freq_range1->max_bandwidth_khz;
1320 max_bandwidth2 = freq_range2->max_bandwidth_khz;
1322 if (rule1->flags & NL80211_RRF_AUTO_BW)
1323 max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
1324 if (rule2->flags & NL80211_RRF_AUTO_BW)
1325 max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
1327 freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
1329 intersected_rule->flags = rule1->flags | rule2->flags;
1332 * In case NL80211_RRF_AUTO_BW requested for both rules
1333 * set AUTO_BW in intersected rule also. Next we will
1334 * calculate BW correctly in handle_channel function.
1335 * In other case remove AUTO_BW flag while we calculate
1336 * maximum bandwidth correctly and auto calculation is
1339 if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
1340 (rule2->flags & NL80211_RRF_AUTO_BW))
1341 intersected_rule->flags |= NL80211_RRF_AUTO_BW;
1343 intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
1345 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
1346 if (freq_range->max_bandwidth_khz > freq_diff)
1347 freq_range->max_bandwidth_khz = freq_diff;
1349 power_rule->max_eirp = min(power_rule1->max_eirp,
1350 power_rule2->max_eirp);
1351 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
1352 power_rule2->max_antenna_gain);
1354 intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms,
1357 if (!is_valid_reg_rule(intersected_rule))
1363 /* check whether old rule contains new rule */
1364 static bool rule_contains(struct ieee80211_reg_rule *r1,
1365 struct ieee80211_reg_rule *r2)
1367 /* for simplicity, currently consider only same flags */
1368 if (r1->flags != r2->flags)
1371 /* verify r1 is more restrictive */
1372 if ((r1->power_rule.max_antenna_gain >
1373 r2->power_rule.max_antenna_gain) ||
1374 r1->power_rule.max_eirp > r2->power_rule.max_eirp)
1377 /* make sure r2's range is contained within r1 */
1378 if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz ||
1379 r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz)
1382 /* and finally verify that r1.max_bw >= r2.max_bw */
1383 if (r1->freq_range.max_bandwidth_khz <
1384 r2->freq_range.max_bandwidth_khz)
1390 /* add or extend current rules. do nothing if rule is already contained */
1391 static void add_rule(struct ieee80211_reg_rule *rule,
1392 struct ieee80211_reg_rule *reg_rules, u32 *n_rules)
1394 struct ieee80211_reg_rule *tmp_rule;
1397 for (i = 0; i < *n_rules; i++) {
1398 tmp_rule = ®_rules[i];
1399 /* rule is already contained - do nothing */
1400 if (rule_contains(tmp_rule, rule))
1403 /* extend rule if possible */
1404 if (rule_contains(rule, tmp_rule)) {
1405 memcpy(tmp_rule, rule, sizeof(*rule));
1410 memcpy(®_rules[*n_rules], rule, sizeof(*rule));
1415 * regdom_intersect - do the intersection between two regulatory domains
1416 * @rd1: first regulatory domain
1417 * @rd2: second regulatory domain
1419 * Use this function to get the intersection between two regulatory domains.
1420 * Once completed we will mark the alpha2 for the rd as intersected, "98",
1421 * as no one single alpha2 can represent this regulatory domain.
1423 * Returns a pointer to the regulatory domain structure which will hold the
1424 * resulting intersection of rules between rd1 and rd2. We will
1425 * kzalloc() this structure for you.
1427 static struct ieee80211_regdomain *
1428 regdom_intersect(const struct ieee80211_regdomain *rd1,
1429 const struct ieee80211_regdomain *rd2)
1431 int r, size_of_regd;
1433 unsigned int num_rules = 0;
1434 const struct ieee80211_reg_rule *rule1, *rule2;
1435 struct ieee80211_reg_rule intersected_rule;
1436 struct ieee80211_regdomain *rd;
1442 * First we get a count of the rules we'll need, then we actually
1443 * build them. This is to so we can malloc() and free() a
1444 * regdomain once. The reason we use reg_rules_intersect() here
1445 * is it will return -EINVAL if the rule computed makes no sense.
1446 * All rules that do check out OK are valid.
1449 for (x = 0; x < rd1->n_reg_rules; x++) {
1450 rule1 = &rd1->reg_rules[x];
1451 for (y = 0; y < rd2->n_reg_rules; y++) {
1452 rule2 = &rd2->reg_rules[y];
1453 if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
1462 size_of_regd = sizeof(struct ieee80211_regdomain) +
1463 num_rules * sizeof(struct ieee80211_reg_rule);
1465 rd = kzalloc(size_of_regd, GFP_KERNEL);
1469 for (x = 0; x < rd1->n_reg_rules; x++) {
1470 rule1 = &rd1->reg_rules[x];
1471 for (y = 0; y < rd2->n_reg_rules; y++) {
1472 rule2 = &rd2->reg_rules[y];
1473 r = reg_rules_intersect(rd1, rd2, rule1, rule2,
1476 * No need to memset here the intersected rule here as
1477 * we're not using the stack anymore
1482 add_rule(&intersected_rule, rd->reg_rules,
1487 rd->alpha2[0] = '9';
1488 rd->alpha2[1] = '8';
1489 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
1496 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
1497 * want to just have the channel structure use these
1499 static u32 map_regdom_flags(u32 rd_flags)
1501 u32 channel_flags = 0;
1502 if (rd_flags & NL80211_RRF_NO_IR_ALL)
1503 channel_flags |= IEEE80211_CHAN_NO_IR;
1504 if (rd_flags & NL80211_RRF_DFS)
1505 channel_flags |= IEEE80211_CHAN_RADAR;
1506 if (rd_flags & NL80211_RRF_NO_OFDM)
1507 channel_flags |= IEEE80211_CHAN_NO_OFDM;
1508 if (rd_flags & NL80211_RRF_NO_OUTDOOR)
1509 channel_flags |= IEEE80211_CHAN_INDOOR_ONLY;
1510 if (rd_flags & NL80211_RRF_IR_CONCURRENT)
1511 channel_flags |= IEEE80211_CHAN_IR_CONCURRENT;
1512 if (rd_flags & NL80211_RRF_NO_HT40MINUS)
1513 channel_flags |= IEEE80211_CHAN_NO_HT40MINUS;
1514 if (rd_flags & NL80211_RRF_NO_HT40PLUS)
1515 channel_flags |= IEEE80211_CHAN_NO_HT40PLUS;
1516 if (rd_flags & NL80211_RRF_NO_80MHZ)
1517 channel_flags |= IEEE80211_CHAN_NO_80MHZ;
1518 if (rd_flags & NL80211_RRF_NO_160MHZ)
1519 channel_flags |= IEEE80211_CHAN_NO_160MHZ;
1520 return channel_flags;
1523 static const struct ieee80211_reg_rule *
1524 freq_reg_info_regd(u32 center_freq,
1525 const struct ieee80211_regdomain *regd, u32 bw)
1528 bool band_rule_found = false;
1529 bool bw_fits = false;
1532 return ERR_PTR(-EINVAL);
1534 for (i = 0; i < regd->n_reg_rules; i++) {
1535 const struct ieee80211_reg_rule *rr;
1536 const struct ieee80211_freq_range *fr = NULL;
1538 rr = ®d->reg_rules[i];
1539 fr = &rr->freq_range;
1542 * We only need to know if one frequency rule was
1543 * was in center_freq's band, that's enough, so lets
1544 * not overwrite it once found
1546 if (!band_rule_found)
1547 band_rule_found = freq_in_rule_band(fr, center_freq);
1549 bw_fits = cfg80211_does_bw_fit_range(fr, center_freq, bw);
1551 if (band_rule_found && bw_fits)
1555 if (!band_rule_found)
1556 return ERR_PTR(-ERANGE);
1558 return ERR_PTR(-EINVAL);
1561 static const struct ieee80211_reg_rule *
1562 __freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
1564 const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy);
1565 const struct ieee80211_reg_rule *reg_rule = NULL;
1568 for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
1569 reg_rule = freq_reg_info_regd(center_freq, regd, bw);
1570 if (!IS_ERR(reg_rule))
1577 const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
1580 return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(20));
1582 EXPORT_SYMBOL(freq_reg_info);
1584 const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
1586 switch (initiator) {
1587 case NL80211_REGDOM_SET_BY_CORE:
1589 case NL80211_REGDOM_SET_BY_USER:
1591 case NL80211_REGDOM_SET_BY_DRIVER:
1593 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1594 return "country element";
1600 EXPORT_SYMBOL(reg_initiator_name);
1602 static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd,
1603 const struct ieee80211_reg_rule *reg_rule,
1604 const struct ieee80211_channel *chan)
1606 const struct ieee80211_freq_range *freq_range = NULL;
1607 u32 max_bandwidth_khz, bw_flags = 0;
1609 freq_range = ®_rule->freq_range;
1611 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1612 /* Check if auto calculation requested */
1613 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
1614 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1616 /* If we get a reg_rule we can assume that at least 5Mhz fit */
1617 if (!cfg80211_does_bw_fit_range(freq_range,
1618 MHZ_TO_KHZ(chan->center_freq),
1620 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1621 if (!cfg80211_does_bw_fit_range(freq_range,
1622 MHZ_TO_KHZ(chan->center_freq),
1624 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1626 if (max_bandwidth_khz < MHZ_TO_KHZ(10))
1627 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1628 if (max_bandwidth_khz < MHZ_TO_KHZ(20))
1629 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1630 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1631 bw_flags |= IEEE80211_CHAN_NO_HT40;
1632 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1633 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1634 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1635 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1640 * Note that right now we assume the desired channel bandwidth
1641 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
1642 * per channel, the primary and the extension channel).
1644 static void handle_channel(struct wiphy *wiphy,
1645 enum nl80211_reg_initiator initiator,
1646 struct ieee80211_channel *chan)
1648 u32 flags, bw_flags = 0;
1649 const struct ieee80211_reg_rule *reg_rule = NULL;
1650 const struct ieee80211_power_rule *power_rule = NULL;
1651 struct wiphy *request_wiphy = NULL;
1652 struct regulatory_request *lr = get_last_request();
1653 const struct ieee80211_regdomain *regd;
1655 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1657 flags = chan->orig_flags;
1659 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
1660 if (IS_ERR(reg_rule)) {
1662 * We will disable all channels that do not match our
1663 * received regulatory rule unless the hint is coming
1664 * from a Country IE and the Country IE had no information
1665 * about a band. The IEEE 802.11 spec allows for an AP
1666 * to send only a subset of the regulatory rules allowed,
1667 * so an AP in the US that only supports 2.4 GHz may only send
1668 * a country IE with information for the 2.4 GHz band
1669 * while 5 GHz is still supported.
1671 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1672 PTR_ERR(reg_rule) == -ERANGE)
1675 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1676 request_wiphy && request_wiphy == wiphy &&
1677 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1678 pr_debug("Disabling freq %d MHz for good\n",
1680 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1681 chan->flags = chan->orig_flags;
1683 pr_debug("Disabling freq %d MHz\n",
1685 chan->flags |= IEEE80211_CHAN_DISABLED;
1690 regd = reg_get_regdomain(wiphy);
1692 power_rule = ®_rule->power_rule;
1693 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
1695 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1696 request_wiphy && request_wiphy == wiphy &&
1697 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1699 * This guarantees the driver's requested regulatory domain
1700 * will always be used as a base for further regulatory
1703 chan->flags = chan->orig_flags =
1704 map_regdom_flags(reg_rule->flags) | bw_flags;
1705 chan->max_antenna_gain = chan->orig_mag =
1706 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1707 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
1708 (int) MBM_TO_DBM(power_rule->max_eirp);
1710 if (chan->flags & IEEE80211_CHAN_RADAR) {
1711 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1712 if (reg_rule->dfs_cac_ms)
1713 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1719 chan->dfs_state = NL80211_DFS_USABLE;
1720 chan->dfs_state_entered = jiffies;
1722 chan->beacon_found = false;
1723 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1724 chan->max_antenna_gain =
1725 min_t(int, chan->orig_mag,
1726 MBI_TO_DBI(power_rule->max_antenna_gain));
1727 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1729 if (chan->flags & IEEE80211_CHAN_RADAR) {
1730 if (reg_rule->dfs_cac_ms)
1731 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1733 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1736 if (chan->orig_mpwr) {
1738 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1739 * will always follow the passed country IE power settings.
1741 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1742 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
1743 chan->max_power = chan->max_reg_power;
1745 chan->max_power = min(chan->orig_mpwr,
1746 chan->max_reg_power);
1748 chan->max_power = chan->max_reg_power;
1751 static void handle_band(struct wiphy *wiphy,
1752 enum nl80211_reg_initiator initiator,
1753 struct ieee80211_supported_band *sband)
1760 for (i = 0; i < sband->n_channels; i++)
1761 handle_channel(wiphy, initiator, &sband->channels[i]);
1764 static bool reg_request_cell_base(struct regulatory_request *request)
1766 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1768 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1771 bool reg_last_request_cell_base(void)
1773 return reg_request_cell_base(get_last_request());
1776 #ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
1777 /* Core specific check */
1778 static enum reg_request_treatment
1779 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1781 struct regulatory_request *lr = get_last_request();
1783 if (!reg_num_devs_support_basehint)
1784 return REG_REQ_IGNORE;
1786 if (reg_request_cell_base(lr) &&
1787 !regdom_changes(pending_request->alpha2))
1788 return REG_REQ_ALREADY_SET;
1793 /* Device specific check */
1794 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1796 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1799 static enum reg_request_treatment
1800 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1802 return REG_REQ_IGNORE;
1805 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1811 static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1813 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1814 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1819 static bool ignore_reg_update(struct wiphy *wiphy,
1820 enum nl80211_reg_initiator initiator)
1822 struct regulatory_request *lr = get_last_request();
1824 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
1828 pr_debug("Ignoring regulatory request set by %s since last_request is not set\n",
1829 reg_initiator_name(initiator));
1833 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1834 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1835 pr_debug("Ignoring regulatory request set by %s since the driver uses its own custom regulatory domain\n",
1836 reg_initiator_name(initiator));
1841 * wiphy->regd will be set once the device has its own
1842 * desired regulatory domain set
1844 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1845 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1846 !is_world_regdom(lr->alpha2)) {
1847 pr_debug("Ignoring regulatory request set by %s since the driver requires its own regulatory domain to be set first\n",
1848 reg_initiator_name(initiator));
1852 if (reg_request_cell_base(lr))
1853 return reg_dev_ignore_cell_hint(wiphy);
1858 static bool reg_is_world_roaming(struct wiphy *wiphy)
1860 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1861 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1862 struct regulatory_request *lr = get_last_request();
1864 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1867 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1868 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1874 static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1875 struct reg_beacon *reg_beacon)
1877 struct ieee80211_supported_band *sband;
1878 struct ieee80211_channel *chan;
1879 bool channel_changed = false;
1880 struct ieee80211_channel chan_before;
1882 sband = wiphy->bands[reg_beacon->chan.band];
1883 chan = &sband->channels[chan_idx];
1885 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1888 if (chan->beacon_found)
1891 chan->beacon_found = true;
1893 if (!reg_is_world_roaming(wiphy))
1896 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1899 chan_before = *chan;
1901 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1902 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1903 channel_changed = true;
1906 if (channel_changed)
1907 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1911 * Called when a scan on a wiphy finds a beacon on
1914 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1915 struct reg_beacon *reg_beacon)
1918 struct ieee80211_supported_band *sband;
1920 if (!wiphy->bands[reg_beacon->chan.band])
1923 sband = wiphy->bands[reg_beacon->chan.band];
1925 for (i = 0; i < sband->n_channels; i++)
1926 handle_reg_beacon(wiphy, i, reg_beacon);
1930 * Called upon reg changes or a new wiphy is added
1932 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1935 struct ieee80211_supported_band *sband;
1936 struct reg_beacon *reg_beacon;
1938 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1939 if (!wiphy->bands[reg_beacon->chan.band])
1941 sband = wiphy->bands[reg_beacon->chan.band];
1942 for (i = 0; i < sband->n_channels; i++)
1943 handle_reg_beacon(wiphy, i, reg_beacon);
1947 /* Reap the advantages of previously found beacons */
1948 static void reg_process_beacons(struct wiphy *wiphy)
1951 * Means we are just firing up cfg80211, so no beacons would
1952 * have been processed yet.
1956 wiphy_update_beacon_reg(wiphy);
1959 static bool is_ht40_allowed(struct ieee80211_channel *chan)
1963 if (chan->flags & IEEE80211_CHAN_DISABLED)
1965 /* This would happen when regulatory rules disallow HT40 completely */
1966 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
1971 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1972 struct ieee80211_channel *channel)
1974 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
1975 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1976 const struct ieee80211_regdomain *regd;
1980 if (!is_ht40_allowed(channel)) {
1981 channel->flags |= IEEE80211_CHAN_NO_HT40;
1986 * We need to ensure the extension channels exist to
1987 * be able to use HT40- or HT40+, this finds them (or not)
1989 for (i = 0; i < sband->n_channels; i++) {
1990 struct ieee80211_channel *c = &sband->channels[i];
1992 if (c->center_freq == (channel->center_freq - 20))
1994 if (c->center_freq == (channel->center_freq + 20))
1999 regd = get_wiphy_regdom(wiphy);
2001 const struct ieee80211_reg_rule *reg_rule =
2002 freq_reg_info_regd(MHZ_TO_KHZ(channel->center_freq),
2003 regd, MHZ_TO_KHZ(20));
2005 if (!IS_ERR(reg_rule))
2006 flags = reg_rule->flags;
2010 * Please note that this assumes target bandwidth is 20 MHz,
2011 * if that ever changes we also need to change the below logic
2012 * to include that as well.
2014 if (!is_ht40_allowed(channel_before) ||
2015 flags & NL80211_RRF_NO_HT40MINUS)
2016 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
2018 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
2020 if (!is_ht40_allowed(channel_after) ||
2021 flags & NL80211_RRF_NO_HT40PLUS)
2022 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
2024 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
2027 static void reg_process_ht_flags_band(struct wiphy *wiphy,
2028 struct ieee80211_supported_band *sband)
2035 for (i = 0; i < sband->n_channels; i++)
2036 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
2039 static void reg_process_ht_flags(struct wiphy *wiphy)
2041 enum nl80211_band band;
2046 for (band = 0; band < NUM_NL80211_BANDS; band++)
2047 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
2050 static void reg_call_notifier(struct wiphy *wiphy,
2051 struct regulatory_request *request)
2053 if (wiphy->reg_notifier)
2054 wiphy->reg_notifier(wiphy, request);
2057 static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
2059 struct cfg80211_chan_def chandef;
2060 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2061 enum nl80211_iftype iftype;
2064 iftype = wdev->iftype;
2066 /* make sure the interface is active */
2067 if (!wdev->netdev || !netif_running(wdev->netdev))
2068 goto wdev_inactive_unlock;
2071 case NL80211_IFTYPE_AP:
2072 case NL80211_IFTYPE_P2P_GO:
2073 if (!wdev->beacon_interval)
2074 goto wdev_inactive_unlock;
2075 chandef = wdev->chandef;
2077 case NL80211_IFTYPE_ADHOC:
2078 if (!wdev->ssid_len)
2079 goto wdev_inactive_unlock;
2080 chandef = wdev->chandef;
2082 case NL80211_IFTYPE_STATION:
2083 case NL80211_IFTYPE_P2P_CLIENT:
2084 if (!wdev->current_bss ||
2085 !wdev->current_bss->pub.channel)
2086 goto wdev_inactive_unlock;
2088 if (!rdev->ops->get_channel ||
2089 rdev_get_channel(rdev, wdev, &chandef))
2090 cfg80211_chandef_create(&chandef,
2091 wdev->current_bss->pub.channel,
2092 NL80211_CHAN_NO_HT);
2094 case NL80211_IFTYPE_MONITOR:
2095 case NL80211_IFTYPE_AP_VLAN:
2096 case NL80211_IFTYPE_P2P_DEVICE:
2097 /* no enforcement required */
2100 /* others not implemented for now */
2108 case NL80211_IFTYPE_AP:
2109 case NL80211_IFTYPE_P2P_GO:
2110 case NL80211_IFTYPE_ADHOC:
2111 return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
2112 case NL80211_IFTYPE_STATION:
2113 case NL80211_IFTYPE_P2P_CLIENT:
2114 return cfg80211_chandef_usable(wiphy, &chandef,
2115 IEEE80211_CHAN_DISABLED);
2122 wdev_inactive_unlock:
2127 static void reg_leave_invalid_chans(struct wiphy *wiphy)
2129 struct wireless_dev *wdev;
2130 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2134 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
2135 if (!reg_wdev_chan_valid(wiphy, wdev))
2136 cfg80211_leave(rdev, wdev);
2139 static void reg_check_chans_work(struct work_struct *work)
2141 struct cfg80211_registered_device *rdev;
2143 pr_debug("Verifying active interfaces after reg change\n");
2146 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
2147 if (!(rdev->wiphy.regulatory_flags &
2148 REGULATORY_IGNORE_STALE_KICKOFF))
2149 reg_leave_invalid_chans(&rdev->wiphy);
2154 static void reg_check_channels(void)
2157 * Give usermode a chance to do something nicer (move to another
2158 * channel, orderly disconnection), before forcing a disconnection.
2160 mod_delayed_work(system_power_efficient_wq,
2162 msecs_to_jiffies(REG_ENFORCE_GRACE_MS));
2165 static void wiphy_update_regulatory(struct wiphy *wiphy,
2166 enum nl80211_reg_initiator initiator)
2168 enum nl80211_band band;
2169 struct regulatory_request *lr = get_last_request();
2171 if (ignore_reg_update(wiphy, initiator)) {
2173 * Regulatory updates set by CORE are ignored for custom
2174 * regulatory cards. Let us notify the changes to the driver,
2175 * as some drivers used this to restore its orig_* reg domain.
2177 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
2178 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG &&
2179 !(wiphy->regulatory_flags &
2180 REGULATORY_WIPHY_SELF_MANAGED))
2181 reg_call_notifier(wiphy, lr);
2185 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
2187 for (band = 0; band < NUM_NL80211_BANDS; band++)
2188 handle_band(wiphy, initiator, wiphy->bands[band]);
2190 reg_process_beacons(wiphy);
2191 reg_process_ht_flags(wiphy);
2192 reg_call_notifier(wiphy, lr);
2195 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
2197 struct cfg80211_registered_device *rdev;
2198 struct wiphy *wiphy;
2202 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2203 wiphy = &rdev->wiphy;
2204 wiphy_update_regulatory(wiphy, initiator);
2207 reg_check_channels();
2210 static void handle_channel_custom(struct wiphy *wiphy,
2211 struct ieee80211_channel *chan,
2212 const struct ieee80211_regdomain *regd)
2215 const struct ieee80211_reg_rule *reg_rule = NULL;
2216 const struct ieee80211_power_rule *power_rule = NULL;
2219 for (bw = MHZ_TO_KHZ(20); bw >= MHZ_TO_KHZ(5); bw = bw / 2) {
2220 reg_rule = freq_reg_info_regd(MHZ_TO_KHZ(chan->center_freq),
2222 if (!IS_ERR(reg_rule))
2226 if (IS_ERR(reg_rule)) {
2227 pr_debug("Disabling freq %d MHz as custom regd has no rule that fits it\n",
2229 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
2230 chan->flags |= IEEE80211_CHAN_DISABLED;
2232 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
2233 chan->flags = chan->orig_flags;
2238 power_rule = ®_rule->power_rule;
2239 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
2241 chan->dfs_state_entered = jiffies;
2242 chan->dfs_state = NL80211_DFS_USABLE;
2244 chan->beacon_found = false;
2246 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
2247 chan->flags = chan->orig_flags | bw_flags |
2248 map_regdom_flags(reg_rule->flags);
2250 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
2252 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
2253 chan->max_reg_power = chan->max_power =
2254 (int) MBM_TO_DBM(power_rule->max_eirp);
2256 if (chan->flags & IEEE80211_CHAN_RADAR) {
2257 if (reg_rule->dfs_cac_ms)
2258 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
2260 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
2263 chan->max_power = chan->max_reg_power;
2266 static void handle_band_custom(struct wiphy *wiphy,
2267 struct ieee80211_supported_band *sband,
2268 const struct ieee80211_regdomain *regd)
2275 for (i = 0; i < sband->n_channels; i++)
2276 handle_channel_custom(wiphy, &sband->channels[i], regd);
2279 /* Used by drivers prior to wiphy registration */
2280 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
2281 const struct ieee80211_regdomain *regd)
2283 enum nl80211_band band;
2284 unsigned int bands_set = 0;
2286 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
2287 "wiphy should have REGULATORY_CUSTOM_REG\n");
2288 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
2290 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2291 if (!wiphy->bands[band])
2293 handle_band_custom(wiphy, wiphy->bands[band], regd);
2298 * no point in calling this if it won't have any effect
2299 * on your device's supported bands.
2301 WARN_ON(!bands_set);
2303 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
2305 static void reg_set_request_processed(void)
2307 bool need_more_processing = false;
2308 struct regulatory_request *lr = get_last_request();
2310 lr->processed = true;
2312 spin_lock(®_requests_lock);
2313 if (!list_empty(®_requests_list))
2314 need_more_processing = true;
2315 spin_unlock(®_requests_lock);
2317 cancel_crda_timeout();
2319 if (need_more_processing)
2320 schedule_work(®_work);
2324 * reg_process_hint_core - process core regulatory requests
2325 * @pending_request: a pending core regulatory request
2327 * The wireless subsystem can use this function to process
2328 * a regulatory request issued by the regulatory core.
2330 static enum reg_request_treatment
2331 reg_process_hint_core(struct regulatory_request *core_request)
2333 if (reg_query_database(core_request)) {
2334 core_request->intersect = false;
2335 core_request->processed = false;
2336 reg_update_last_request(core_request);
2340 return REG_REQ_IGNORE;
2343 static enum reg_request_treatment
2344 __reg_process_hint_user(struct regulatory_request *user_request)
2346 struct regulatory_request *lr = get_last_request();
2348 if (reg_request_cell_base(user_request))
2349 return reg_ignore_cell_hint(user_request);
2351 if (reg_request_cell_base(lr))
2352 return REG_REQ_IGNORE;
2354 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
2355 return REG_REQ_INTERSECT;
2357 * If the user knows better the user should set the regdom
2358 * to their country before the IE is picked up
2360 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
2362 return REG_REQ_IGNORE;
2364 * Process user requests only after previous user/driver/core
2365 * requests have been processed
2367 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
2368 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2369 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
2370 regdom_changes(lr->alpha2))
2371 return REG_REQ_IGNORE;
2373 if (!regdom_changes(user_request->alpha2))
2374 return REG_REQ_ALREADY_SET;
2380 * reg_process_hint_user - process user regulatory requests
2381 * @user_request: a pending user regulatory request
2383 * The wireless subsystem can use this function to process
2384 * a regulatory request initiated by userspace.
2386 static enum reg_request_treatment
2387 reg_process_hint_user(struct regulatory_request *user_request)
2389 enum reg_request_treatment treatment;
2391 treatment = __reg_process_hint_user(user_request);
2392 if (treatment == REG_REQ_IGNORE ||
2393 treatment == REG_REQ_ALREADY_SET)
2394 return REG_REQ_IGNORE;
2396 user_request->intersect = treatment == REG_REQ_INTERSECT;
2397 user_request->processed = false;
2399 if (reg_query_database(user_request)) {
2400 reg_update_last_request(user_request);
2401 user_alpha2[0] = user_request->alpha2[0];
2402 user_alpha2[1] = user_request->alpha2[1];
2406 return REG_REQ_IGNORE;
2409 static enum reg_request_treatment
2410 __reg_process_hint_driver(struct regulatory_request *driver_request)
2412 struct regulatory_request *lr = get_last_request();
2414 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
2415 if (regdom_changes(driver_request->alpha2))
2417 return REG_REQ_ALREADY_SET;
2421 * This would happen if you unplug and plug your card
2422 * back in or if you add a new device for which the previously
2423 * loaded card also agrees on the regulatory domain.
2425 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
2426 !regdom_changes(driver_request->alpha2))
2427 return REG_REQ_ALREADY_SET;
2429 return REG_REQ_INTERSECT;
2433 * reg_process_hint_driver - process driver regulatory requests
2434 * @driver_request: a pending driver regulatory request
2436 * The wireless subsystem can use this function to process
2437 * a regulatory request issued by an 802.11 driver.
2439 * Returns one of the different reg request treatment values.
2441 static enum reg_request_treatment
2442 reg_process_hint_driver(struct wiphy *wiphy,
2443 struct regulatory_request *driver_request)
2445 const struct ieee80211_regdomain *regd, *tmp;
2446 enum reg_request_treatment treatment;
2448 treatment = __reg_process_hint_driver(driver_request);
2450 switch (treatment) {
2453 case REG_REQ_IGNORE:
2454 return REG_REQ_IGNORE;
2455 case REG_REQ_INTERSECT:
2456 case REG_REQ_ALREADY_SET:
2457 regd = reg_copy_regd(get_cfg80211_regdom());
2459 return REG_REQ_IGNORE;
2461 tmp = get_wiphy_regdom(wiphy);
2462 rcu_assign_pointer(wiphy->regd, regd);
2463 rcu_free_regdom(tmp);
2467 driver_request->intersect = treatment == REG_REQ_INTERSECT;
2468 driver_request->processed = false;
2471 * Since CRDA will not be called in this case as we already
2472 * have applied the requested regulatory domain before we just
2473 * inform userspace we have processed the request
2475 if (treatment == REG_REQ_ALREADY_SET) {
2476 nl80211_send_reg_change_event(driver_request);
2477 reg_update_last_request(driver_request);
2478 reg_set_request_processed();
2479 return REG_REQ_ALREADY_SET;
2482 if (reg_query_database(driver_request)) {
2483 reg_update_last_request(driver_request);
2487 return REG_REQ_IGNORE;
2490 static enum reg_request_treatment
2491 __reg_process_hint_country_ie(struct wiphy *wiphy,
2492 struct regulatory_request *country_ie_request)
2494 struct wiphy *last_wiphy = NULL;
2495 struct regulatory_request *lr = get_last_request();
2497 if (reg_request_cell_base(lr)) {
2498 /* Trust a Cell base station over the AP's country IE */
2499 if (regdom_changes(country_ie_request->alpha2))
2500 return REG_REQ_IGNORE;
2501 return REG_REQ_ALREADY_SET;
2503 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
2504 return REG_REQ_IGNORE;
2507 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
2510 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
2513 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2515 if (last_wiphy != wiphy) {
2517 * Two cards with two APs claiming different
2518 * Country IE alpha2s. We could
2519 * intersect them, but that seems unlikely
2520 * to be correct. Reject second one for now.
2522 if (regdom_changes(country_ie_request->alpha2))
2523 return REG_REQ_IGNORE;
2524 return REG_REQ_ALREADY_SET;
2527 if (regdom_changes(country_ie_request->alpha2))
2529 return REG_REQ_ALREADY_SET;
2533 * reg_process_hint_country_ie - process regulatory requests from country IEs
2534 * @country_ie_request: a regulatory request from a country IE
2536 * The wireless subsystem can use this function to process
2537 * a regulatory request issued by a country Information Element.
2539 * Returns one of the different reg request treatment values.
2541 static enum reg_request_treatment
2542 reg_process_hint_country_ie(struct wiphy *wiphy,
2543 struct regulatory_request *country_ie_request)
2545 enum reg_request_treatment treatment;
2547 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
2549 switch (treatment) {
2552 case REG_REQ_IGNORE:
2553 return REG_REQ_IGNORE;
2554 case REG_REQ_ALREADY_SET:
2555 reg_free_request(country_ie_request);
2556 return REG_REQ_ALREADY_SET;
2557 case REG_REQ_INTERSECT:
2559 * This doesn't happen yet, not sure we
2560 * ever want to support it for this case.
2562 WARN_ONCE(1, "Unexpected intersection for country elements");
2563 return REG_REQ_IGNORE;
2566 country_ie_request->intersect = false;
2567 country_ie_request->processed = false;
2569 if (reg_query_database(country_ie_request)) {
2570 reg_update_last_request(country_ie_request);
2574 return REG_REQ_IGNORE;
2577 bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2)
2579 const struct ieee80211_regdomain *wiphy1_regd = NULL;
2580 const struct ieee80211_regdomain *wiphy2_regd = NULL;
2581 const struct ieee80211_regdomain *cfg80211_regd = NULL;
2582 bool dfs_domain_same;
2586 cfg80211_regd = rcu_dereference(cfg80211_regdomain);
2587 wiphy1_regd = rcu_dereference(wiphy1->regd);
2589 wiphy1_regd = cfg80211_regd;
2591 wiphy2_regd = rcu_dereference(wiphy2->regd);
2593 wiphy2_regd = cfg80211_regd;
2595 dfs_domain_same = wiphy1_regd->dfs_region == wiphy2_regd->dfs_region;
2599 return dfs_domain_same;
2602 static void reg_copy_dfs_chan_state(struct ieee80211_channel *dst_chan,
2603 struct ieee80211_channel *src_chan)
2605 if (!(dst_chan->flags & IEEE80211_CHAN_RADAR) ||
2606 !(src_chan->flags & IEEE80211_CHAN_RADAR))
2609 if (dst_chan->flags & IEEE80211_CHAN_DISABLED ||
2610 src_chan->flags & IEEE80211_CHAN_DISABLED)
2613 if (src_chan->center_freq == dst_chan->center_freq &&
2614 dst_chan->dfs_state == NL80211_DFS_USABLE) {
2615 dst_chan->dfs_state = src_chan->dfs_state;
2616 dst_chan->dfs_state_entered = src_chan->dfs_state_entered;
2620 static void wiphy_share_dfs_chan_state(struct wiphy *dst_wiphy,
2621 struct wiphy *src_wiphy)
2623 struct ieee80211_supported_band *src_sband, *dst_sband;
2624 struct ieee80211_channel *src_chan, *dst_chan;
2627 if (!reg_dfs_domain_same(dst_wiphy, src_wiphy))
2630 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2631 dst_sband = dst_wiphy->bands[band];
2632 src_sband = src_wiphy->bands[band];
2633 if (!dst_sband || !src_sband)
2636 for (i = 0; i < dst_sband->n_channels; i++) {
2637 dst_chan = &dst_sband->channels[i];
2638 for (j = 0; j < src_sband->n_channels; j++) {
2639 src_chan = &src_sband->channels[j];
2640 reg_copy_dfs_chan_state(dst_chan, src_chan);
2646 static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy)
2648 struct cfg80211_registered_device *rdev;
2652 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2653 if (wiphy == &rdev->wiphy)
2655 wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy);
2659 /* This processes *all* regulatory hints */
2660 static void reg_process_hint(struct regulatory_request *reg_request)
2662 struct wiphy *wiphy = NULL;
2663 enum reg_request_treatment treatment;
2665 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
2666 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
2668 switch (reg_request->initiator) {
2669 case NL80211_REGDOM_SET_BY_CORE:
2670 treatment = reg_process_hint_core(reg_request);
2672 case NL80211_REGDOM_SET_BY_USER:
2673 treatment = reg_process_hint_user(reg_request);
2675 case NL80211_REGDOM_SET_BY_DRIVER:
2678 treatment = reg_process_hint_driver(wiphy, reg_request);
2680 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2683 treatment = reg_process_hint_country_ie(wiphy, reg_request);
2686 WARN(1, "invalid initiator %d\n", reg_request->initiator);
2690 if (treatment == REG_REQ_IGNORE)
2693 WARN(treatment != REG_REQ_OK && treatment != REG_REQ_ALREADY_SET,
2694 "unexpected treatment value %d\n", treatment);
2696 /* This is required so that the orig_* parameters are saved.
2697 * NOTE: treatment must be set for any case that reaches here!
2699 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
2700 wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
2701 wiphy_update_regulatory(wiphy, reg_request->initiator);
2702 wiphy_all_share_dfs_chan_state(wiphy);
2703 reg_check_channels();
2709 reg_free_request(reg_request);
2712 static void notify_self_managed_wiphys(struct regulatory_request *request)
2714 struct cfg80211_registered_device *rdev;
2715 struct wiphy *wiphy;
2717 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2718 wiphy = &rdev->wiphy;
2719 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED &&
2720 request->initiator == NL80211_REGDOM_SET_BY_USER &&
2721 request->user_reg_hint_type ==
2722 NL80211_USER_REG_HINT_CELL_BASE)
2723 reg_call_notifier(wiphy, request);
2728 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
2729 * Regulatory hints come on a first come first serve basis and we
2730 * must process each one atomically.
2732 static void reg_process_pending_hints(void)
2734 struct regulatory_request *reg_request, *lr;
2736 lr = get_last_request();
2738 /* When last_request->processed becomes true this will be rescheduled */
2739 if (lr && !lr->processed) {
2740 reg_process_hint(lr);
2744 spin_lock(®_requests_lock);
2746 if (list_empty(®_requests_list)) {
2747 spin_unlock(®_requests_lock);
2751 reg_request = list_first_entry(®_requests_list,
2752 struct regulatory_request,
2754 list_del_init(®_request->list);
2756 spin_unlock(®_requests_lock);
2758 notify_self_managed_wiphys(reg_request);
2760 reg_process_hint(reg_request);
2762 lr = get_last_request();
2764 spin_lock(®_requests_lock);
2765 if (!list_empty(®_requests_list) && lr && lr->processed)
2766 schedule_work(®_work);
2767 spin_unlock(®_requests_lock);
2770 /* Processes beacon hints -- this has nothing to do with country IEs */
2771 static void reg_process_pending_beacon_hints(void)
2773 struct cfg80211_registered_device *rdev;
2774 struct reg_beacon *pending_beacon, *tmp;
2776 /* This goes through the _pending_ beacon list */
2777 spin_lock_bh(®_pending_beacons_lock);
2779 list_for_each_entry_safe(pending_beacon, tmp,
2780 ®_pending_beacons, list) {
2781 list_del_init(&pending_beacon->list);
2783 /* Applies the beacon hint to current wiphys */
2784 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
2785 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
2787 /* Remembers the beacon hint for new wiphys or reg changes */
2788 list_add_tail(&pending_beacon->list, ®_beacon_list);
2791 spin_unlock_bh(®_pending_beacons_lock);
2794 static void reg_process_self_managed_hints(void)
2796 struct cfg80211_registered_device *rdev;
2797 struct wiphy *wiphy;
2798 const struct ieee80211_regdomain *tmp;
2799 const struct ieee80211_regdomain *regd;
2800 enum nl80211_band band;
2801 struct regulatory_request request = {};
2803 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2804 wiphy = &rdev->wiphy;
2806 spin_lock(®_requests_lock);
2807 regd = rdev->requested_regd;
2808 rdev->requested_regd = NULL;
2809 spin_unlock(®_requests_lock);
2814 tmp = get_wiphy_regdom(wiphy);
2815 rcu_assign_pointer(wiphy->regd, regd);
2816 rcu_free_regdom(tmp);
2818 for (band = 0; band < NUM_NL80211_BANDS; band++)
2819 handle_band_custom(wiphy, wiphy->bands[band], regd);
2821 reg_process_ht_flags(wiphy);
2823 request.wiphy_idx = get_wiphy_idx(wiphy);
2824 request.alpha2[0] = regd->alpha2[0];
2825 request.alpha2[1] = regd->alpha2[1];
2826 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
2828 nl80211_send_wiphy_reg_change_event(&request);
2831 reg_check_channels();
2834 static void reg_todo(struct work_struct *work)
2837 reg_process_pending_hints();
2838 reg_process_pending_beacon_hints();
2839 reg_process_self_managed_hints();
2843 static void queue_regulatory_request(struct regulatory_request *request)
2845 request->alpha2[0] = toupper(request->alpha2[0]);
2846 request->alpha2[1] = toupper(request->alpha2[1]);
2848 spin_lock(®_requests_lock);
2849 list_add_tail(&request->list, ®_requests_list);
2850 spin_unlock(®_requests_lock);
2852 schedule_work(®_work);
2856 * Core regulatory hint -- happens during cfg80211_init()
2857 * and when we restore regulatory settings.
2859 static int regulatory_hint_core(const char *alpha2)
2861 struct regulatory_request *request;
2863 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2867 request->alpha2[0] = alpha2[0];
2868 request->alpha2[1] = alpha2[1];
2869 request->initiator = NL80211_REGDOM_SET_BY_CORE;
2871 queue_regulatory_request(request);
2877 int regulatory_hint_user(const char *alpha2,
2878 enum nl80211_user_reg_hint_type user_reg_hint_type)
2880 struct regulatory_request *request;
2882 if (WARN_ON(!alpha2))
2885 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2889 request->wiphy_idx = WIPHY_IDX_INVALID;
2890 request->alpha2[0] = alpha2[0];
2891 request->alpha2[1] = alpha2[1];
2892 request->initiator = NL80211_REGDOM_SET_BY_USER;
2893 request->user_reg_hint_type = user_reg_hint_type;
2895 /* Allow calling CRDA again */
2896 reset_crda_timeouts();
2898 queue_regulatory_request(request);
2903 int regulatory_hint_indoor(bool is_indoor, u32 portid)
2905 spin_lock(®_indoor_lock);
2907 /* It is possible that more than one user space process is trying to
2908 * configure the indoor setting. To handle such cases, clear the indoor
2909 * setting in case that some process does not think that the device
2910 * is operating in an indoor environment. In addition, if a user space
2911 * process indicates that it is controlling the indoor setting, save its
2912 * portid, i.e., make it the owner.
2914 reg_is_indoor = is_indoor;
2915 if (reg_is_indoor) {
2916 if (!reg_is_indoor_portid)
2917 reg_is_indoor_portid = portid;
2919 reg_is_indoor_portid = 0;
2922 spin_unlock(®_indoor_lock);
2925 reg_check_channels();
2930 void regulatory_netlink_notify(u32 portid)
2932 spin_lock(®_indoor_lock);
2934 if (reg_is_indoor_portid != portid) {
2935 spin_unlock(®_indoor_lock);
2939 reg_is_indoor = false;
2940 reg_is_indoor_portid = 0;
2942 spin_unlock(®_indoor_lock);
2944 reg_check_channels();
2948 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
2950 struct regulatory_request *request;
2952 if (WARN_ON(!alpha2 || !wiphy))
2955 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
2957 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2961 request->wiphy_idx = get_wiphy_idx(wiphy);
2963 request->alpha2[0] = alpha2[0];
2964 request->alpha2[1] = alpha2[1];
2965 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
2967 /* Allow calling CRDA again */
2968 reset_crda_timeouts();
2970 queue_regulatory_request(request);
2974 EXPORT_SYMBOL(regulatory_hint);
2976 void regulatory_hint_country_ie(struct wiphy *wiphy, enum nl80211_band band,
2977 const u8 *country_ie, u8 country_ie_len)
2980 enum environment_cap env = ENVIRON_ANY;
2981 struct regulatory_request *request = NULL, *lr;
2983 /* IE len must be evenly divisible by 2 */
2984 if (country_ie_len & 0x01)
2987 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
2990 request = kzalloc(sizeof(*request), GFP_KERNEL);
2994 alpha2[0] = country_ie[0];
2995 alpha2[1] = country_ie[1];
2997 if (country_ie[2] == 'I')
2998 env = ENVIRON_INDOOR;
2999 else if (country_ie[2] == 'O')
3000 env = ENVIRON_OUTDOOR;
3003 lr = get_last_request();
3009 * We will run this only upon a successful connection on cfg80211.
3010 * We leave conflict resolution to the workqueue, where can hold
3013 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
3014 lr->wiphy_idx != WIPHY_IDX_INVALID)
3017 request->wiphy_idx = get_wiphy_idx(wiphy);
3018 request->alpha2[0] = alpha2[0];
3019 request->alpha2[1] = alpha2[1];
3020 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
3021 request->country_ie_env = env;
3023 /* Allow calling CRDA again */
3024 reset_crda_timeouts();
3026 queue_regulatory_request(request);
3033 static void restore_alpha2(char *alpha2, bool reset_user)
3035 /* indicates there is no alpha2 to consider for restoration */
3039 /* The user setting has precedence over the module parameter */
3040 if (is_user_regdom_saved()) {
3041 /* Unless we're asked to ignore it and reset it */
3043 pr_debug("Restoring regulatory settings including user preference\n");
3044 user_alpha2[0] = '9';
3045 user_alpha2[1] = '7';
3048 * If we're ignoring user settings, we still need to
3049 * check the module parameter to ensure we put things
3050 * back as they were for a full restore.
3052 if (!is_world_regdom(ieee80211_regdom)) {
3053 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
3054 ieee80211_regdom[0], ieee80211_regdom[1]);
3055 alpha2[0] = ieee80211_regdom[0];
3056 alpha2[1] = ieee80211_regdom[1];
3059 pr_debug("Restoring regulatory settings while preserving user preference for: %c%c\n",
3060 user_alpha2[0], user_alpha2[1]);
3061 alpha2[0] = user_alpha2[0];
3062 alpha2[1] = user_alpha2[1];
3064 } else if (!is_world_regdom(ieee80211_regdom)) {
3065 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
3066 ieee80211_regdom[0], ieee80211_regdom[1]);
3067 alpha2[0] = ieee80211_regdom[0];
3068 alpha2[1] = ieee80211_regdom[1];
3070 pr_debug("Restoring regulatory settings\n");
3073 static void restore_custom_reg_settings(struct wiphy *wiphy)
3075 struct ieee80211_supported_band *sband;
3076 enum nl80211_band band;
3077 struct ieee80211_channel *chan;
3080 for (band = 0; band < NUM_NL80211_BANDS; band++) {
3081 sband = wiphy->bands[band];
3084 for (i = 0; i < sband->n_channels; i++) {
3085 chan = &sband->channels[i];
3086 chan->flags = chan->orig_flags;
3087 chan->max_antenna_gain = chan->orig_mag;
3088 chan->max_power = chan->orig_mpwr;
3089 chan->beacon_found = false;
3095 * Restoring regulatory settings involves ingoring any
3096 * possibly stale country IE information and user regulatory
3097 * settings if so desired, this includes any beacon hints
3098 * learned as we could have traveled outside to another country
3099 * after disconnection. To restore regulatory settings we do
3100 * exactly what we did at bootup:
3102 * - send a core regulatory hint
3103 * - send a user regulatory hint if applicable
3105 * Device drivers that send a regulatory hint for a specific country
3106 * keep their own regulatory domain on wiphy->regd so that does does
3107 * not need to be remembered.
3109 static void restore_regulatory_settings(bool reset_user)
3112 char world_alpha2[2];
3113 struct reg_beacon *reg_beacon, *btmp;
3114 LIST_HEAD(tmp_reg_req_list);
3115 struct cfg80211_registered_device *rdev;
3120 * Clear the indoor setting in case that it is not controlled by user
3121 * space, as otherwise there is no guarantee that the device is still
3122 * operating in an indoor environment.
3124 spin_lock(®_indoor_lock);
3125 if (reg_is_indoor && !reg_is_indoor_portid) {
3126 reg_is_indoor = false;
3127 reg_check_channels();
3129 spin_unlock(®_indoor_lock);
3131 reset_regdomains(true, &world_regdom);
3132 restore_alpha2(alpha2, reset_user);
3135 * If there's any pending requests we simply
3136 * stash them to a temporary pending queue and
3137 * add then after we've restored regulatory
3140 spin_lock(®_requests_lock);
3141 list_splice_tail_init(®_requests_list, &tmp_reg_req_list);
3142 spin_unlock(®_requests_lock);
3144 /* Clear beacon hints */
3145 spin_lock_bh(®_pending_beacons_lock);
3146 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
3147 list_del(®_beacon->list);
3150 spin_unlock_bh(®_pending_beacons_lock);
3152 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
3153 list_del(®_beacon->list);
3157 /* First restore to the basic regulatory settings */
3158 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
3159 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
3161 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
3162 if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
3164 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
3165 restore_custom_reg_settings(&rdev->wiphy);
3168 regulatory_hint_core(world_alpha2);
3171 * This restores the ieee80211_regdom module parameter
3172 * preference or the last user requested regulatory
3173 * settings, user regulatory settings takes precedence.
3175 if (is_an_alpha2(alpha2))
3176 regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER);
3178 spin_lock(®_requests_lock);
3179 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
3180 spin_unlock(®_requests_lock);
3182 pr_debug("Kicking the queue\n");
3184 schedule_work(®_work);
3187 void regulatory_hint_disconnect(void)
3189 pr_debug("All devices are disconnected, going to restore regulatory settings\n");
3190 restore_regulatory_settings(false);
3193 static bool freq_is_chan_12_13_14(u16 freq)
3195 if (freq == ieee80211_channel_to_frequency(12, NL80211_BAND_2GHZ) ||
3196 freq == ieee80211_channel_to_frequency(13, NL80211_BAND_2GHZ) ||
3197 freq == ieee80211_channel_to_frequency(14, NL80211_BAND_2GHZ))
3202 static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
3204 struct reg_beacon *pending_beacon;
3206 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
3207 if (beacon_chan->center_freq ==
3208 pending_beacon->chan.center_freq)
3213 int regulatory_hint_found_beacon(struct wiphy *wiphy,
3214 struct ieee80211_channel *beacon_chan,
3217 struct reg_beacon *reg_beacon;
3220 if (beacon_chan->beacon_found ||
3221 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
3222 (beacon_chan->band == NL80211_BAND_2GHZ &&
3223 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
3226 spin_lock_bh(®_pending_beacons_lock);
3227 processing = pending_reg_beacon(beacon_chan);
3228 spin_unlock_bh(®_pending_beacons_lock);
3233 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
3237 pr_debug("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
3238 beacon_chan->center_freq,
3239 ieee80211_frequency_to_channel(beacon_chan->center_freq),
3242 memcpy(®_beacon->chan, beacon_chan,
3243 sizeof(struct ieee80211_channel));
3246 * Since we can be called from BH or and non-BH context
3247 * we must use spin_lock_bh()
3249 spin_lock_bh(®_pending_beacons_lock);
3250 list_add_tail(®_beacon->list, ®_pending_beacons);
3251 spin_unlock_bh(®_pending_beacons_lock);
3253 schedule_work(®_work);
3258 static void print_rd_rules(const struct ieee80211_regdomain *rd)
3261 const struct ieee80211_reg_rule *reg_rule = NULL;
3262 const struct ieee80211_freq_range *freq_range = NULL;
3263 const struct ieee80211_power_rule *power_rule = NULL;
3264 char bw[32], cac_time[32];
3266 pr_debug(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
3268 for (i = 0; i < rd->n_reg_rules; i++) {
3269 reg_rule = &rd->reg_rules[i];
3270 freq_range = ®_rule->freq_range;
3271 power_rule = ®_rule->power_rule;
3273 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
3274 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
3275 freq_range->max_bandwidth_khz,
3276 reg_get_max_bandwidth(rd, reg_rule));
3278 snprintf(bw, sizeof(bw), "%d KHz",
3279 freq_range->max_bandwidth_khz);
3281 if (reg_rule->flags & NL80211_RRF_DFS)
3282 scnprintf(cac_time, sizeof(cac_time), "%u s",
3283 reg_rule->dfs_cac_ms/1000);
3285 scnprintf(cac_time, sizeof(cac_time), "N/A");
3289 * There may not be documentation for max antenna gain
3290 * in certain regions
3292 if (power_rule->max_antenna_gain)
3293 pr_debug(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
3294 freq_range->start_freq_khz,
3295 freq_range->end_freq_khz,
3297 power_rule->max_antenna_gain,
3298 power_rule->max_eirp,
3301 pr_debug(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
3302 freq_range->start_freq_khz,
3303 freq_range->end_freq_khz,
3305 power_rule->max_eirp,
3310 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
3312 switch (dfs_region) {
3313 case NL80211_DFS_UNSET:
3314 case NL80211_DFS_FCC:
3315 case NL80211_DFS_ETSI:
3316 case NL80211_DFS_JP:
3319 pr_debug("Ignoring unknown DFS master region: %d\n", dfs_region);
3324 static void print_regdomain(const struct ieee80211_regdomain *rd)
3326 struct regulatory_request *lr = get_last_request();
3328 if (is_intersected_alpha2(rd->alpha2)) {
3329 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
3330 struct cfg80211_registered_device *rdev;
3331 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
3333 pr_debug("Current regulatory domain updated by AP to: %c%c\n",
3334 rdev->country_ie_alpha2[0],
3335 rdev->country_ie_alpha2[1]);
3337 pr_debug("Current regulatory domain intersected:\n");
3339 pr_debug("Current regulatory domain intersected:\n");
3340 } else if (is_world_regdom(rd->alpha2)) {
3341 pr_debug("World regulatory domain updated:\n");
3343 if (is_unknown_alpha2(rd->alpha2))
3344 pr_debug("Regulatory domain changed to driver built-in settings (unknown country)\n");
3346 if (reg_request_cell_base(lr))
3347 pr_debug("Regulatory domain changed to country: %c%c by Cell Station\n",
3348 rd->alpha2[0], rd->alpha2[1]);
3350 pr_debug("Regulatory domain changed to country: %c%c\n",
3351 rd->alpha2[0], rd->alpha2[1]);
3355 pr_debug(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
3359 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
3361 pr_debug("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
3365 static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
3367 if (!is_world_regdom(rd->alpha2))
3369 update_world_regdomain(rd);
3373 static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
3374 struct regulatory_request *user_request)
3376 const struct ieee80211_regdomain *intersected_rd = NULL;
3378 if (!regdom_changes(rd->alpha2))
3381 if (!is_valid_rd(rd)) {
3382 pr_err("Invalid regulatory domain detected: %c%c\n",
3383 rd->alpha2[0], rd->alpha2[1]);
3384 print_regdomain_info(rd);
3388 if (!user_request->intersect) {
3389 reset_regdomains(false, rd);
3393 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
3394 if (!intersected_rd)
3399 reset_regdomains(false, intersected_rd);
3404 static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
3405 struct regulatory_request *driver_request)
3407 const struct ieee80211_regdomain *regd;
3408 const struct ieee80211_regdomain *intersected_rd = NULL;
3409 const struct ieee80211_regdomain *tmp;
3410 struct wiphy *request_wiphy;
3412 if (is_world_regdom(rd->alpha2))
3415 if (!regdom_changes(rd->alpha2))
3418 if (!is_valid_rd(rd)) {
3419 pr_err("Invalid regulatory domain detected: %c%c\n",
3420 rd->alpha2[0], rd->alpha2[1]);
3421 print_regdomain_info(rd);
3425 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
3429 if (!driver_request->intersect) {
3430 if (request_wiphy->regd)
3433 regd = reg_copy_regd(rd);
3435 return PTR_ERR(regd);
3437 rcu_assign_pointer(request_wiphy->regd, regd);
3438 reset_regdomains(false, rd);
3442 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
3443 if (!intersected_rd)
3447 * We can trash what CRDA provided now.
3448 * However if a driver requested this specific regulatory
3449 * domain we keep it for its private use
3451 tmp = get_wiphy_regdom(request_wiphy);
3452 rcu_assign_pointer(request_wiphy->regd, rd);
3453 rcu_free_regdom(tmp);
3457 reset_regdomains(false, intersected_rd);
3462 static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
3463 struct regulatory_request *country_ie_request)
3465 struct wiphy *request_wiphy;
3467 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
3468 !is_unknown_alpha2(rd->alpha2))
3472 * Lets only bother proceeding on the same alpha2 if the current
3473 * rd is non static (it means CRDA was present and was used last)
3474 * and the pending request came in from a country IE
3477 if (!is_valid_rd(rd)) {
3478 pr_err("Invalid regulatory domain detected: %c%c\n",
3479 rd->alpha2[0], rd->alpha2[1]);
3480 print_regdomain_info(rd);
3484 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
3488 if (country_ie_request->intersect)
3491 reset_regdomains(false, rd);
3496 * Use this call to set the current regulatory domain. Conflicts with
3497 * multiple drivers can be ironed out later. Caller must've already
3498 * kmalloc'd the rd structure.
3500 int set_regdom(const struct ieee80211_regdomain *rd,
3501 enum ieee80211_regd_source regd_src)
3503 struct regulatory_request *lr;
3504 bool user_reset = false;
3507 if (!reg_is_valid_request(rd->alpha2)) {
3512 if (regd_src == REGD_SOURCE_CRDA)
3513 reset_crda_timeouts();
3515 lr = get_last_request();
3517 /* Note that this doesn't update the wiphys, this is done below */
3518 switch (lr->initiator) {
3519 case NL80211_REGDOM_SET_BY_CORE:
3520 r = reg_set_rd_core(rd);
3522 case NL80211_REGDOM_SET_BY_USER:
3523 r = reg_set_rd_user(rd, lr);
3526 case NL80211_REGDOM_SET_BY_DRIVER:
3527 r = reg_set_rd_driver(rd, lr);
3529 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
3530 r = reg_set_rd_country_ie(rd, lr);
3533 WARN(1, "invalid initiator %d\n", lr->initiator);
3541 reg_set_request_processed();
3544 /* Back to world regulatory in case of errors */
3545 restore_regulatory_settings(user_reset);
3552 /* This would make this whole thing pointless */
3553 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
3556 /* update all wiphys now with the new established regulatory domain */
3557 update_all_wiphy_regulatory(lr->initiator);
3559 print_regdomain(get_cfg80211_regdom());
3561 nl80211_send_reg_change_event(lr);
3563 reg_set_request_processed();
3568 static int __regulatory_set_wiphy_regd(struct wiphy *wiphy,
3569 struct ieee80211_regdomain *rd)
3571 const struct ieee80211_regdomain *regd;
3572 const struct ieee80211_regdomain *prev_regd;
3573 struct cfg80211_registered_device *rdev;
3575 if (WARN_ON(!wiphy || !rd))
3578 if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED),
3579 "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n"))
3582 if (WARN(!is_valid_rd(rd), "Invalid regulatory domain detected\n")) {
3583 print_regdomain_info(rd);
3587 regd = reg_copy_regd(rd);
3589 return PTR_ERR(regd);
3591 rdev = wiphy_to_rdev(wiphy);
3593 spin_lock(®_requests_lock);
3594 prev_regd = rdev->requested_regd;
3595 rdev->requested_regd = regd;
3596 spin_unlock(®_requests_lock);
3602 int regulatory_set_wiphy_regd(struct wiphy *wiphy,
3603 struct ieee80211_regdomain *rd)
3605 int ret = __regulatory_set_wiphy_regd(wiphy, rd);
3610 schedule_work(®_work);
3613 EXPORT_SYMBOL(regulatory_set_wiphy_regd);
3615 int regulatory_set_wiphy_regd_sync_rtnl(struct wiphy *wiphy,
3616 struct ieee80211_regdomain *rd)
3622 ret = __regulatory_set_wiphy_regd(wiphy, rd);
3626 /* process the request immediately */
3627 reg_process_self_managed_hints();
3630 EXPORT_SYMBOL(regulatory_set_wiphy_regd_sync_rtnl);
3632 void wiphy_regulatory_register(struct wiphy *wiphy)
3634 struct regulatory_request *lr = get_last_request();
3636 /* self-managed devices ignore beacon hints and country IE */
3637 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
3638 wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS |
3639 REGULATORY_COUNTRY_IE_IGNORE;
3642 * The last request may have been received before this
3643 * registration call. Call the driver notifier if
3644 * initiator is USER and user type is CELL_BASE.
3646 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
3647 lr->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE)
3648 reg_call_notifier(wiphy, lr);
3651 if (!reg_dev_ignore_cell_hint(wiphy))
3652 reg_num_devs_support_basehint++;
3654 wiphy_update_regulatory(wiphy, lr->initiator);
3655 wiphy_all_share_dfs_chan_state(wiphy);
3658 void wiphy_regulatory_deregister(struct wiphy *wiphy)
3660 struct wiphy *request_wiphy = NULL;
3661 struct regulatory_request *lr;
3663 lr = get_last_request();
3665 if (!reg_dev_ignore_cell_hint(wiphy))
3666 reg_num_devs_support_basehint--;
3668 rcu_free_regdom(get_wiphy_regdom(wiphy));
3669 RCU_INIT_POINTER(wiphy->regd, NULL);
3672 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
3674 if (!request_wiphy || request_wiphy != wiphy)
3677 lr->wiphy_idx = WIPHY_IDX_INVALID;
3678 lr->country_ie_env = ENVIRON_ANY;
3682 * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for
3683 * UNII band definitions
3685 int cfg80211_get_unii(int freq)
3688 if (freq >= 5150 && freq <= 5250)
3692 if (freq > 5250 && freq <= 5350)
3696 if (freq > 5350 && freq <= 5470)
3700 if (freq > 5470 && freq <= 5725)
3704 if (freq > 5725 && freq <= 5825)
3710 bool regulatory_indoor_allowed(void)
3712 return reg_is_indoor;
3715 bool regulatory_pre_cac_allowed(struct wiphy *wiphy)
3717 const struct ieee80211_regdomain *regd = NULL;
3718 const struct ieee80211_regdomain *wiphy_regd = NULL;
3719 bool pre_cac_allowed = false;
3723 regd = rcu_dereference(cfg80211_regdomain);
3724 wiphy_regd = rcu_dereference(wiphy->regd);
3726 if (regd->dfs_region == NL80211_DFS_ETSI)
3727 pre_cac_allowed = true;
3731 return pre_cac_allowed;
3734 if (regd->dfs_region == wiphy_regd->dfs_region &&
3735 wiphy_regd->dfs_region == NL80211_DFS_ETSI)
3736 pre_cac_allowed = true;
3740 return pre_cac_allowed;
3743 void regulatory_propagate_dfs_state(struct wiphy *wiphy,
3744 struct cfg80211_chan_def *chandef,
3745 enum nl80211_dfs_state dfs_state,
3746 enum nl80211_radar_event event)
3748 struct cfg80211_registered_device *rdev;
3752 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
3755 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
3756 if (wiphy == &rdev->wiphy)
3759 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
3762 if (!ieee80211_get_channel(&rdev->wiphy,
3763 chandef->chan->center_freq))
3766 cfg80211_set_dfs_state(&rdev->wiphy, chandef, dfs_state);
3768 if (event == NL80211_RADAR_DETECTED ||
3769 event == NL80211_RADAR_CAC_FINISHED)
3770 cfg80211_sched_dfs_chan_update(rdev);
3772 nl80211_radar_notify(rdev, chandef, event, NULL, GFP_KERNEL);
3776 static int __init regulatory_init_db(void)
3780 err = load_builtin_regdb_keys();
3784 /* We always try to get an update for the static regdomain */
3785 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
3787 if (err == -ENOMEM) {
3788 platform_device_unregister(reg_pdev);
3792 * N.B. kobject_uevent_env() can fail mainly for when we're out
3793 * memory which is handled and propagated appropriately above
3794 * but it can also fail during a netlink_broadcast() or during
3795 * early boot for call_usermodehelper(). For now treat these
3796 * errors as non-fatal.
3798 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
3802 * Finally, if the user set the module parameter treat it
3805 if (!is_world_regdom(ieee80211_regdom))
3806 regulatory_hint_user(ieee80211_regdom,
3807 NL80211_USER_REG_HINT_USER);
3812 late_initcall(regulatory_init_db);
3815 int __init regulatory_init(void)
3817 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
3818 if (IS_ERR(reg_pdev))
3819 return PTR_ERR(reg_pdev);
3821 spin_lock_init(®_requests_lock);
3822 spin_lock_init(®_pending_beacons_lock);
3823 spin_lock_init(®_indoor_lock);
3825 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
3827 user_alpha2[0] = '9';
3828 user_alpha2[1] = '7';
3831 return regulatory_init_db();
3837 void regulatory_exit(void)
3839 struct regulatory_request *reg_request, *tmp;
3840 struct reg_beacon *reg_beacon, *btmp;
3842 cancel_work_sync(®_work);
3843 cancel_crda_timeout_sync();
3844 cancel_delayed_work_sync(®_check_chans);
3846 /* Lock to suppress warnings */
3848 reset_regdomains(true, NULL);
3851 dev_set_uevent_suppress(®_pdev->dev, true);
3853 platform_device_unregister(reg_pdev);
3855 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
3856 list_del(®_beacon->list);
3860 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
3861 list_del(®_beacon->list);
3865 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
3866 list_del(®_request->list);
3870 if (!IS_ERR_OR_NULL(regdb))
3873 free_regdb_keyring();