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;
428 int size_of_regd, size_of_wmms;
430 struct ieee80211_wmm_rule *d_wmm, *s_wmm;
433 sizeof(struct ieee80211_regdomain) +
434 src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
435 size_of_wmms = src_regd->n_wmm_rules *
436 sizeof(struct ieee80211_wmm_rule);
438 regd = kzalloc(size_of_regd + size_of_wmms, GFP_KERNEL);
440 return ERR_PTR(-ENOMEM);
442 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
444 d_wmm = (struct ieee80211_wmm_rule *)((u8 *)regd + size_of_regd);
445 s_wmm = (struct ieee80211_wmm_rule *)((u8 *)src_regd + size_of_regd);
446 memcpy(d_wmm, s_wmm, size_of_wmms);
448 for (i = 0; i < src_regd->n_reg_rules; i++) {
449 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
450 sizeof(struct ieee80211_reg_rule));
451 if (!src_regd->reg_rules[i].wmm_rule)
454 regd->reg_rules[i].wmm_rule = d_wmm +
455 (src_regd->reg_rules[i].wmm_rule - s_wmm) /
456 sizeof(struct ieee80211_wmm_rule);
461 struct reg_regdb_apply_request {
462 struct list_head list;
463 const struct ieee80211_regdomain *regdom;
466 static LIST_HEAD(reg_regdb_apply_list);
467 static DEFINE_MUTEX(reg_regdb_apply_mutex);
469 static void reg_regdb_apply(struct work_struct *work)
471 struct reg_regdb_apply_request *request;
475 mutex_lock(®_regdb_apply_mutex);
476 while (!list_empty(®_regdb_apply_list)) {
477 request = list_first_entry(®_regdb_apply_list,
478 struct reg_regdb_apply_request,
480 list_del(&request->list);
482 set_regdom(request->regdom, REGD_SOURCE_INTERNAL_DB);
485 mutex_unlock(®_regdb_apply_mutex);
490 static DECLARE_WORK(reg_regdb_work, reg_regdb_apply);
492 static int reg_schedule_apply(const struct ieee80211_regdomain *regdom)
494 struct reg_regdb_apply_request *request;
496 request = kzalloc(sizeof(struct reg_regdb_apply_request), GFP_KERNEL);
502 request->regdom = regdom;
504 mutex_lock(®_regdb_apply_mutex);
505 list_add_tail(&request->list, ®_regdb_apply_list);
506 mutex_unlock(®_regdb_apply_mutex);
508 schedule_work(®_regdb_work);
512 #ifdef CONFIG_CFG80211_CRDA_SUPPORT
513 /* Max number of consecutive attempts to communicate with CRDA */
514 #define REG_MAX_CRDA_TIMEOUTS 10
516 static u32 reg_crda_timeouts;
518 static void crda_timeout_work(struct work_struct *work);
519 static DECLARE_DELAYED_WORK(crda_timeout, crda_timeout_work);
521 static void crda_timeout_work(struct work_struct *work)
523 pr_debug("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
526 restore_regulatory_settings(true);
530 static void cancel_crda_timeout(void)
532 cancel_delayed_work(&crda_timeout);
535 static void cancel_crda_timeout_sync(void)
537 cancel_delayed_work_sync(&crda_timeout);
540 static void reset_crda_timeouts(void)
542 reg_crda_timeouts = 0;
546 * This lets us keep regulatory code which is updated on a regulatory
547 * basis in userspace.
549 static int call_crda(const char *alpha2)
552 char *env[] = { country, NULL };
555 snprintf(country, sizeof(country), "COUNTRY=%c%c",
556 alpha2[0], alpha2[1]);
558 if (reg_crda_timeouts > REG_MAX_CRDA_TIMEOUTS) {
559 pr_debug("Exceeded CRDA call max attempts. Not calling CRDA\n");
563 if (!is_world_regdom((char *) alpha2))
564 pr_debug("Calling CRDA for country: %c%c\n",
565 alpha2[0], alpha2[1]);
567 pr_debug("Calling CRDA to update world regulatory domain\n");
569 ret = kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, env);
573 queue_delayed_work(system_power_efficient_wq,
574 &crda_timeout, msecs_to_jiffies(3142));
578 static inline void cancel_crda_timeout(void) {}
579 static inline void cancel_crda_timeout_sync(void) {}
580 static inline void reset_crda_timeouts(void) {}
581 static inline int call_crda(const char *alpha2)
585 #endif /* CONFIG_CFG80211_CRDA_SUPPORT */
587 /* code to directly load a firmware database through request_firmware */
588 static const struct fwdb_header *regdb;
590 struct fwdb_country {
593 /* this struct cannot be extended */
594 } __packed __aligned(4);
596 struct fwdb_collection {
600 /* no optional data yet */
601 /* aligned to 2, then followed by __be16 array of rule pointers */
602 } __packed __aligned(4);
605 FWDB_FLAG_NO_OFDM = BIT(0),
606 FWDB_FLAG_NO_OUTDOOR = BIT(1),
607 FWDB_FLAG_DFS = BIT(2),
608 FWDB_FLAG_NO_IR = BIT(3),
609 FWDB_FLAG_AUTO_BW = BIT(4),
618 struct fwdb_wmm_rule {
619 struct fwdb_wmm_ac client[IEEE80211_NUM_ACS];
620 struct fwdb_wmm_ac ap[IEEE80211_NUM_ACS];
627 __be32 start, end, max_bw;
628 /* start of optional data */
631 } __packed __aligned(4);
633 #define FWDB_MAGIC 0x52474442
634 #define FWDB_VERSION 20
639 struct fwdb_country country[];
640 } __packed __aligned(4);
642 static int ecw2cw(int ecw)
644 return (1 << ecw) - 1;
647 static bool valid_wmm(struct fwdb_wmm_rule *rule)
649 struct fwdb_wmm_ac *ac = (struct fwdb_wmm_ac *)rule;
652 for (i = 0; i < IEEE80211_NUM_ACS * 2; i++) {
653 u16 cw_min = ecw2cw((ac[i].ecw & 0xf0) >> 4);
654 u16 cw_max = ecw2cw(ac[i].ecw & 0x0f);
655 u8 aifsn = ac[i].aifsn;
657 if (cw_min >= cw_max)
667 static bool valid_rule(const u8 *data, unsigned int size, u16 rule_ptr)
669 struct fwdb_rule *rule = (void *)(data + (rule_ptr << 2));
671 if ((u8 *)rule + sizeof(rule->len) > data + size)
674 /* mandatory fields */
675 if (rule->len < offsetofend(struct fwdb_rule, max_bw))
677 if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr)) {
678 u32 wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
679 struct fwdb_wmm_rule *wmm;
681 if (wmm_ptr + sizeof(struct fwdb_wmm_rule) > size)
684 wmm = (void *)(data + wmm_ptr);
692 static bool valid_country(const u8 *data, unsigned int size,
693 const struct fwdb_country *country)
695 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
696 struct fwdb_collection *coll = (void *)(data + ptr);
700 /* make sure we can read len/n_rules */
701 if ((u8 *)coll + offsetofend(typeof(*coll), n_rules) > data + size)
704 /* make sure base struct and all rules fit */
705 if ((u8 *)coll + ALIGN(coll->len, 2) +
706 (coll->n_rules * 2) > data + size)
709 /* mandatory fields must exist */
710 if (coll->len < offsetofend(struct fwdb_collection, dfs_region))
713 rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
715 for (i = 0; i < coll->n_rules; i++) {
716 u16 rule_ptr = be16_to_cpu(rules_ptr[i]);
718 if (!valid_rule(data, size, rule_ptr))
725 #ifdef CONFIG_CFG80211_REQUIRE_SIGNED_REGDB
726 static struct key *builtin_regdb_keys;
728 static void __init load_keys_from_buffer(const u8 *p, unsigned int buflen)
730 const u8 *end = p + buflen;
735 /* Each cert begins with an ASN.1 SEQUENCE tag and must be more
736 * than 256 bytes in size.
743 plen = (p[2] << 8) | p[3];
748 key = key_create_or_update(make_key_ref(builtin_regdb_keys, 1),
749 "asymmetric", NULL, p, plen,
750 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
751 KEY_USR_VIEW | KEY_USR_READ),
752 KEY_ALLOC_NOT_IN_QUOTA |
754 KEY_ALLOC_BYPASS_RESTRICTION);
756 pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
759 pr_notice("Loaded X.509 cert '%s'\n",
760 key_ref_to_ptr(key)->description);
769 pr_err("Problem parsing in-kernel X.509 certificate list\n");
772 static int __init load_builtin_regdb_keys(void)
775 keyring_alloc(".builtin_regdb_keys",
776 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
777 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
778 KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
779 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
780 if (IS_ERR(builtin_regdb_keys))
781 return PTR_ERR(builtin_regdb_keys);
783 pr_notice("Loading compiled-in X.509 certificates for regulatory database\n");
785 #ifdef CONFIG_CFG80211_USE_KERNEL_REGDB_KEYS
786 load_keys_from_buffer(shipped_regdb_certs, shipped_regdb_certs_len);
788 #ifdef CONFIG_CFG80211_EXTRA_REGDB_KEYDIR
789 if (CONFIG_CFG80211_EXTRA_REGDB_KEYDIR[0] != '\0')
790 load_keys_from_buffer(extra_regdb_certs, extra_regdb_certs_len);
796 static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
798 const struct firmware *sig;
801 if (request_firmware(&sig, "regulatory.db.p7s", ®_pdev->dev))
804 result = verify_pkcs7_signature(data, size, sig->data, sig->size,
806 VERIFYING_UNSPECIFIED_SIGNATURE,
809 release_firmware(sig);
814 static void free_regdb_keyring(void)
816 key_put(builtin_regdb_keys);
819 static int load_builtin_regdb_keys(void)
824 static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
829 static void free_regdb_keyring(void)
832 #endif /* CONFIG_CFG80211_REQUIRE_SIGNED_REGDB */
834 static bool valid_regdb(const u8 *data, unsigned int size)
836 const struct fwdb_header *hdr = (void *)data;
837 const struct fwdb_country *country;
839 if (size < sizeof(*hdr))
842 if (hdr->magic != cpu_to_be32(FWDB_MAGIC))
845 if (hdr->version != cpu_to_be32(FWDB_VERSION))
848 if (!regdb_has_valid_signature(data, size))
851 country = &hdr->country[0];
852 while ((u8 *)(country + 1) <= data + size) {
853 if (!country->coll_ptr)
855 if (!valid_country(data, size, country))
863 static void set_wmm_rule(struct ieee80211_wmm_rule *rule,
864 struct fwdb_wmm_rule *wmm)
868 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
869 rule->client[i].cw_min =
870 ecw2cw((wmm->client[i].ecw & 0xf0) >> 4);
871 rule->client[i].cw_max = ecw2cw(wmm->client[i].ecw & 0x0f);
872 rule->client[i].aifsn = wmm->client[i].aifsn;
873 rule->client[i].cot = 1000 * be16_to_cpu(wmm->client[i].cot);
874 rule->ap[i].cw_min = ecw2cw((wmm->ap[i].ecw & 0xf0) >> 4);
875 rule->ap[i].cw_max = ecw2cw(wmm->ap[i].ecw & 0x0f);
876 rule->ap[i].aifsn = wmm->ap[i].aifsn;
877 rule->ap[i].cot = 1000 * be16_to_cpu(wmm->ap[i].cot);
881 static int __regdb_query_wmm(const struct fwdb_header *db,
882 const struct fwdb_country *country, int freq,
883 u32 *dbptr, struct ieee80211_wmm_rule *rule)
885 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
886 struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
889 for (i = 0; i < coll->n_rules; i++) {
890 __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
891 unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
892 struct fwdb_rule *rrule = (void *)((u8 *)db + rule_ptr);
893 struct fwdb_wmm_rule *wmm;
894 unsigned int wmm_ptr;
896 if (rrule->len < offsetofend(struct fwdb_rule, wmm_ptr))
899 if (freq >= KHZ_TO_MHZ(be32_to_cpu(rrule->start)) &&
900 freq <= KHZ_TO_MHZ(be32_to_cpu(rrule->end))) {
901 wmm_ptr = be16_to_cpu(rrule->wmm_ptr) << 2;
902 wmm = (void *)((u8 *)db + wmm_ptr);
903 set_wmm_rule(rule, wmm);
913 int reg_query_regdb_wmm(char *alpha2, int freq, u32 *dbptr,
914 struct ieee80211_wmm_rule *rule)
916 const struct fwdb_header *hdr = regdb;
917 const struct fwdb_country *country;
920 return PTR_ERR(regdb);
922 country = &hdr->country[0];
923 while (country->coll_ptr) {
924 if (alpha2_equal(alpha2, country->alpha2))
925 return __regdb_query_wmm(regdb, country, freq, dbptr,
933 EXPORT_SYMBOL(reg_query_regdb_wmm);
936 struct ieee80211_wmm_rule *rule;
940 static struct ieee80211_wmm_rule *find_wmm_ptr(struct wmm_ptrs *wmm_ptrs,
941 u32 wmm_ptr, int n_wmms)
945 for (i = 0; i < n_wmms; i++) {
946 if (wmm_ptrs[i].ptr == wmm_ptr)
947 return wmm_ptrs[i].rule;
952 static int regdb_query_country(const struct fwdb_header *db,
953 const struct fwdb_country *country)
955 unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
956 struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
957 struct ieee80211_regdomain *regdom;
958 struct ieee80211_regdomain *tmp_rd;
959 unsigned int size_of_regd, i, n_wmms = 0;
960 struct wmm_ptrs *wmm_ptrs;
962 size_of_regd = sizeof(struct ieee80211_regdomain) +
963 coll->n_rules * sizeof(struct ieee80211_reg_rule);
965 regdom = kzalloc(size_of_regd, GFP_KERNEL);
969 wmm_ptrs = kcalloc(coll->n_rules, sizeof(*wmm_ptrs), GFP_KERNEL);
975 regdom->n_reg_rules = coll->n_rules;
976 regdom->alpha2[0] = country->alpha2[0];
977 regdom->alpha2[1] = country->alpha2[1];
978 regdom->dfs_region = coll->dfs_region;
980 for (i = 0; i < regdom->n_reg_rules; i++) {
981 __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
982 unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
983 struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
984 struct ieee80211_reg_rule *rrule = ®dom->reg_rules[i];
986 rrule->freq_range.start_freq_khz = be32_to_cpu(rule->start);
987 rrule->freq_range.end_freq_khz = be32_to_cpu(rule->end);
988 rrule->freq_range.max_bandwidth_khz = be32_to_cpu(rule->max_bw);
990 rrule->power_rule.max_antenna_gain = 0;
991 rrule->power_rule.max_eirp = be16_to_cpu(rule->max_eirp);
994 if (rule->flags & FWDB_FLAG_NO_OFDM)
995 rrule->flags |= NL80211_RRF_NO_OFDM;
996 if (rule->flags & FWDB_FLAG_NO_OUTDOOR)
997 rrule->flags |= NL80211_RRF_NO_OUTDOOR;
998 if (rule->flags & FWDB_FLAG_DFS)
999 rrule->flags |= NL80211_RRF_DFS;
1000 if (rule->flags & FWDB_FLAG_NO_IR)
1001 rrule->flags |= NL80211_RRF_NO_IR;
1002 if (rule->flags & FWDB_FLAG_AUTO_BW)
1003 rrule->flags |= NL80211_RRF_AUTO_BW;
1005 rrule->dfs_cac_ms = 0;
1007 /* handle optional data */
1008 if (rule->len >= offsetofend(struct fwdb_rule, cac_timeout))
1010 1000 * be16_to_cpu(rule->cac_timeout);
1011 if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr)) {
1012 u32 wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
1013 struct ieee80211_wmm_rule *wmm_pos =
1014 find_wmm_ptr(wmm_ptrs, wmm_ptr, n_wmms);
1015 struct fwdb_wmm_rule *wmm;
1016 struct ieee80211_wmm_rule *wmm_rule;
1019 rrule->wmm_rule = wmm_pos;
1022 wmm = (void *)((u8 *)db + wmm_ptr);
1023 tmp_rd = krealloc(regdom, size_of_regd + (n_wmms + 1) *
1024 sizeof(struct ieee80211_wmm_rule),
1034 wmm_rule = (struct ieee80211_wmm_rule *)
1035 ((u8 *)regdom + size_of_regd + n_wmms *
1036 sizeof(struct ieee80211_wmm_rule));
1038 set_wmm_rule(wmm_rule, wmm);
1039 wmm_ptrs[n_wmms].ptr = wmm_ptr;
1040 wmm_ptrs[n_wmms++].rule = wmm_rule;
1045 return reg_schedule_apply(regdom);
1048 static int query_regdb(const char *alpha2)
1050 const struct fwdb_header *hdr = regdb;
1051 const struct fwdb_country *country;
1056 return PTR_ERR(regdb);
1058 country = &hdr->country[0];
1059 while (country->coll_ptr) {
1060 if (alpha2_equal(alpha2, country->alpha2))
1061 return regdb_query_country(regdb, country);
1068 static void regdb_fw_cb(const struct firmware *fw, void *context)
1071 bool restore = true;
1075 pr_info("failed to load regulatory.db\n");
1076 set_error = -ENODATA;
1077 } else if (!valid_regdb(fw->data, fw->size)) {
1078 pr_info("loaded regulatory.db is malformed or signature is missing/invalid\n");
1079 set_error = -EINVAL;
1083 if (WARN_ON(regdb && !IS_ERR(regdb))) {
1084 /* just restore and free new db */
1085 } else if (set_error) {
1086 regdb = ERR_PTR(set_error);
1088 db = kmemdup(fw->data, fw->size, GFP_KERNEL);
1091 restore = context && query_regdb(context);
1098 restore_regulatory_settings(true);
1104 release_firmware(fw);
1107 static int query_regdb_file(const char *alpha2)
1112 return query_regdb(alpha2);
1114 alpha2 = kmemdup(alpha2, 2, GFP_KERNEL);
1118 return request_firmware_nowait(THIS_MODULE, true, "regulatory.db",
1119 ®_pdev->dev, GFP_KERNEL,
1120 (void *)alpha2, regdb_fw_cb);
1123 int reg_reload_regdb(void)
1125 const struct firmware *fw;
1129 err = request_firmware(&fw, "regulatory.db", ®_pdev->dev);
1133 if (!valid_regdb(fw->data, fw->size)) {
1138 db = kmemdup(fw->data, fw->size, GFP_KERNEL);
1145 if (!IS_ERR_OR_NULL(regdb))
1151 release_firmware(fw);
1155 static bool reg_query_database(struct regulatory_request *request)
1157 if (query_regdb_file(request->alpha2) == 0)
1160 if (call_crda(request->alpha2) == 0)
1166 bool reg_is_valid_request(const char *alpha2)
1168 struct regulatory_request *lr = get_last_request();
1170 if (!lr || lr->processed)
1173 return alpha2_equal(lr->alpha2, alpha2);
1176 static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
1178 struct regulatory_request *lr = get_last_request();
1181 * Follow the driver's regulatory domain, if present, unless a country
1182 * IE has been processed or a user wants to help complaince further
1184 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1185 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
1187 return get_wiphy_regdom(wiphy);
1189 return get_cfg80211_regdom();
1193 reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd,
1194 const struct ieee80211_reg_rule *rule)
1196 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
1197 const struct ieee80211_freq_range *freq_range_tmp;
1198 const struct ieee80211_reg_rule *tmp;
1199 u32 start_freq, end_freq, idx, no;
1201 for (idx = 0; idx < rd->n_reg_rules; idx++)
1202 if (rule == &rd->reg_rules[idx])
1205 if (idx == rd->n_reg_rules)
1208 /* get start_freq */
1212 tmp = &rd->reg_rules[--no];
1213 freq_range_tmp = &tmp->freq_range;
1215 if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
1218 freq_range = freq_range_tmp;
1221 start_freq = freq_range->start_freq_khz;
1224 freq_range = &rule->freq_range;
1227 while (no < rd->n_reg_rules - 1) {
1228 tmp = &rd->reg_rules[++no];
1229 freq_range_tmp = &tmp->freq_range;
1231 if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
1234 freq_range = freq_range_tmp;
1237 end_freq = freq_range->end_freq_khz;
1239 return end_freq - start_freq;
1242 unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
1243 const struct ieee80211_reg_rule *rule)
1245 unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule);
1247 if (rule->flags & NL80211_RRF_NO_160MHZ)
1248 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80));
1249 if (rule->flags & NL80211_RRF_NO_80MHZ)
1250 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40));
1253 * HT40+/HT40- limits are handled per-channel. Only limit BW if both
1256 if (rule->flags & NL80211_RRF_NO_HT40MINUS &&
1257 rule->flags & NL80211_RRF_NO_HT40PLUS)
1258 bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20));
1263 /* Sanity check on a regulatory rule */
1264 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
1266 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
1269 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
1272 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
1275 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
1277 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
1278 freq_range->max_bandwidth_khz > freq_diff)
1284 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
1286 const struct ieee80211_reg_rule *reg_rule = NULL;
1289 if (!rd->n_reg_rules)
1292 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
1295 for (i = 0; i < rd->n_reg_rules; i++) {
1296 reg_rule = &rd->reg_rules[i];
1297 if (!is_valid_reg_rule(reg_rule))
1305 * freq_in_rule_band - tells us if a frequency is in a frequency band
1306 * @freq_range: frequency rule we want to query
1307 * @freq_khz: frequency we are inquiring about
1309 * This lets us know if a specific frequency rule is or is not relevant to
1310 * a specific frequency's band. Bands are device specific and artificial
1311 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
1312 * however it is safe for now to assume that a frequency rule should not be
1313 * part of a frequency's band if the start freq or end freq are off by more
1314 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
1316 * This resolution can be lowered and should be considered as we add
1317 * regulatory rule support for other "bands".
1319 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
1322 #define ONE_GHZ_IN_KHZ 1000000
1324 * From 802.11ad: directional multi-gigabit (DMG):
1325 * Pertaining to operation in a frequency band containing a channel
1326 * with the Channel starting frequency above 45 GHz.
1328 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
1329 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
1330 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
1332 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
1335 #undef ONE_GHZ_IN_KHZ
1339 * Later on we can perhaps use the more restrictive DFS
1340 * region but we don't have information for that yet so
1341 * for now simply disallow conflicts.
1343 static enum nl80211_dfs_regions
1344 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
1345 const enum nl80211_dfs_regions dfs_region2)
1347 if (dfs_region1 != dfs_region2)
1348 return NL80211_DFS_UNSET;
1353 * Helper for regdom_intersect(), this does the real
1354 * mathematical intersection fun
1356 static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
1357 const struct ieee80211_regdomain *rd2,
1358 const struct ieee80211_reg_rule *rule1,
1359 const struct ieee80211_reg_rule *rule2,
1360 struct ieee80211_reg_rule *intersected_rule)
1362 const struct ieee80211_freq_range *freq_range1, *freq_range2;
1363 struct ieee80211_freq_range *freq_range;
1364 const struct ieee80211_power_rule *power_rule1, *power_rule2;
1365 struct ieee80211_power_rule *power_rule;
1366 u32 freq_diff, max_bandwidth1, max_bandwidth2;
1368 freq_range1 = &rule1->freq_range;
1369 freq_range2 = &rule2->freq_range;
1370 freq_range = &intersected_rule->freq_range;
1372 power_rule1 = &rule1->power_rule;
1373 power_rule2 = &rule2->power_rule;
1374 power_rule = &intersected_rule->power_rule;
1376 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
1377 freq_range2->start_freq_khz);
1378 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
1379 freq_range2->end_freq_khz);
1381 max_bandwidth1 = freq_range1->max_bandwidth_khz;
1382 max_bandwidth2 = freq_range2->max_bandwidth_khz;
1384 if (rule1->flags & NL80211_RRF_AUTO_BW)
1385 max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
1386 if (rule2->flags & NL80211_RRF_AUTO_BW)
1387 max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
1389 freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
1391 intersected_rule->flags = rule1->flags | rule2->flags;
1394 * In case NL80211_RRF_AUTO_BW requested for both rules
1395 * set AUTO_BW in intersected rule also. Next we will
1396 * calculate BW correctly in handle_channel function.
1397 * In other case remove AUTO_BW flag while we calculate
1398 * maximum bandwidth correctly and auto calculation is
1401 if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
1402 (rule2->flags & NL80211_RRF_AUTO_BW))
1403 intersected_rule->flags |= NL80211_RRF_AUTO_BW;
1405 intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
1407 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
1408 if (freq_range->max_bandwidth_khz > freq_diff)
1409 freq_range->max_bandwidth_khz = freq_diff;
1411 power_rule->max_eirp = min(power_rule1->max_eirp,
1412 power_rule2->max_eirp);
1413 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
1414 power_rule2->max_antenna_gain);
1416 intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms,
1419 if (!is_valid_reg_rule(intersected_rule))
1425 /* check whether old rule contains new rule */
1426 static bool rule_contains(struct ieee80211_reg_rule *r1,
1427 struct ieee80211_reg_rule *r2)
1429 /* for simplicity, currently consider only same flags */
1430 if (r1->flags != r2->flags)
1433 /* verify r1 is more restrictive */
1434 if ((r1->power_rule.max_antenna_gain >
1435 r2->power_rule.max_antenna_gain) ||
1436 r1->power_rule.max_eirp > r2->power_rule.max_eirp)
1439 /* make sure r2's range is contained within r1 */
1440 if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz ||
1441 r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz)
1444 /* and finally verify that r1.max_bw >= r2.max_bw */
1445 if (r1->freq_range.max_bandwidth_khz <
1446 r2->freq_range.max_bandwidth_khz)
1452 /* add or extend current rules. do nothing if rule is already contained */
1453 static void add_rule(struct ieee80211_reg_rule *rule,
1454 struct ieee80211_reg_rule *reg_rules, u32 *n_rules)
1456 struct ieee80211_reg_rule *tmp_rule;
1459 for (i = 0; i < *n_rules; i++) {
1460 tmp_rule = ®_rules[i];
1461 /* rule is already contained - do nothing */
1462 if (rule_contains(tmp_rule, rule))
1465 /* extend rule if possible */
1466 if (rule_contains(rule, tmp_rule)) {
1467 memcpy(tmp_rule, rule, sizeof(*rule));
1472 memcpy(®_rules[*n_rules], rule, sizeof(*rule));
1477 * regdom_intersect - do the intersection between two regulatory domains
1478 * @rd1: first regulatory domain
1479 * @rd2: second regulatory domain
1481 * Use this function to get the intersection between two regulatory domains.
1482 * Once completed we will mark the alpha2 for the rd as intersected, "98",
1483 * as no one single alpha2 can represent this regulatory domain.
1485 * Returns a pointer to the regulatory domain structure which will hold the
1486 * resulting intersection of rules between rd1 and rd2. We will
1487 * kzalloc() this structure for you.
1489 static struct ieee80211_regdomain *
1490 regdom_intersect(const struct ieee80211_regdomain *rd1,
1491 const struct ieee80211_regdomain *rd2)
1493 int r, size_of_regd;
1495 unsigned int num_rules = 0;
1496 const struct ieee80211_reg_rule *rule1, *rule2;
1497 struct ieee80211_reg_rule intersected_rule;
1498 struct ieee80211_regdomain *rd;
1504 * First we get a count of the rules we'll need, then we actually
1505 * build them. This is to so we can malloc() and free() a
1506 * regdomain once. The reason we use reg_rules_intersect() here
1507 * is it will return -EINVAL if the rule computed makes no sense.
1508 * All rules that do check out OK are valid.
1511 for (x = 0; x < rd1->n_reg_rules; x++) {
1512 rule1 = &rd1->reg_rules[x];
1513 for (y = 0; y < rd2->n_reg_rules; y++) {
1514 rule2 = &rd2->reg_rules[y];
1515 if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
1524 size_of_regd = sizeof(struct ieee80211_regdomain) +
1525 num_rules * sizeof(struct ieee80211_reg_rule);
1527 rd = kzalloc(size_of_regd, GFP_KERNEL);
1531 for (x = 0; x < rd1->n_reg_rules; x++) {
1532 rule1 = &rd1->reg_rules[x];
1533 for (y = 0; y < rd2->n_reg_rules; y++) {
1534 rule2 = &rd2->reg_rules[y];
1535 r = reg_rules_intersect(rd1, rd2, rule1, rule2,
1538 * No need to memset here the intersected rule here as
1539 * we're not using the stack anymore
1544 add_rule(&intersected_rule, rd->reg_rules,
1549 rd->alpha2[0] = '9';
1550 rd->alpha2[1] = '8';
1551 rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
1558 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
1559 * want to just have the channel structure use these
1561 static u32 map_regdom_flags(u32 rd_flags)
1563 u32 channel_flags = 0;
1564 if (rd_flags & NL80211_RRF_NO_IR_ALL)
1565 channel_flags |= IEEE80211_CHAN_NO_IR;
1566 if (rd_flags & NL80211_RRF_DFS)
1567 channel_flags |= IEEE80211_CHAN_RADAR;
1568 if (rd_flags & NL80211_RRF_NO_OFDM)
1569 channel_flags |= IEEE80211_CHAN_NO_OFDM;
1570 if (rd_flags & NL80211_RRF_NO_OUTDOOR)
1571 channel_flags |= IEEE80211_CHAN_INDOOR_ONLY;
1572 if (rd_flags & NL80211_RRF_IR_CONCURRENT)
1573 channel_flags |= IEEE80211_CHAN_IR_CONCURRENT;
1574 if (rd_flags & NL80211_RRF_NO_HT40MINUS)
1575 channel_flags |= IEEE80211_CHAN_NO_HT40MINUS;
1576 if (rd_flags & NL80211_RRF_NO_HT40PLUS)
1577 channel_flags |= IEEE80211_CHAN_NO_HT40PLUS;
1578 if (rd_flags & NL80211_RRF_NO_80MHZ)
1579 channel_flags |= IEEE80211_CHAN_NO_80MHZ;
1580 if (rd_flags & NL80211_RRF_NO_160MHZ)
1581 channel_flags |= IEEE80211_CHAN_NO_160MHZ;
1582 return channel_flags;
1585 static const struct ieee80211_reg_rule *
1586 freq_reg_info_regd(u32 center_freq,
1587 const struct ieee80211_regdomain *regd, u32 bw)
1590 bool band_rule_found = false;
1591 bool bw_fits = false;
1594 return ERR_PTR(-EINVAL);
1596 for (i = 0; i < regd->n_reg_rules; i++) {
1597 const struct ieee80211_reg_rule *rr;
1598 const struct ieee80211_freq_range *fr = NULL;
1600 rr = ®d->reg_rules[i];
1601 fr = &rr->freq_range;
1604 * We only need to know if one frequency rule was
1605 * was in center_freq's band, that's enough, so lets
1606 * not overwrite it once found
1608 if (!band_rule_found)
1609 band_rule_found = freq_in_rule_band(fr, center_freq);
1611 bw_fits = cfg80211_does_bw_fit_range(fr, center_freq, bw);
1613 if (band_rule_found && bw_fits)
1617 if (!band_rule_found)
1618 return ERR_PTR(-ERANGE);
1620 return ERR_PTR(-EINVAL);
1623 static const struct ieee80211_reg_rule *
1624 __freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
1626 const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy);
1627 const struct ieee80211_reg_rule *reg_rule = NULL;
1630 for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
1631 reg_rule = freq_reg_info_regd(center_freq, regd, bw);
1632 if (!IS_ERR(reg_rule))
1639 const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
1642 return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(20));
1644 EXPORT_SYMBOL(freq_reg_info);
1646 const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
1648 switch (initiator) {
1649 case NL80211_REGDOM_SET_BY_CORE:
1651 case NL80211_REGDOM_SET_BY_USER:
1653 case NL80211_REGDOM_SET_BY_DRIVER:
1655 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1656 return "country IE";
1662 EXPORT_SYMBOL(reg_initiator_name);
1664 static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd,
1665 const struct ieee80211_reg_rule *reg_rule,
1666 const struct ieee80211_channel *chan)
1668 const struct ieee80211_freq_range *freq_range = NULL;
1669 u32 max_bandwidth_khz, bw_flags = 0;
1671 freq_range = ®_rule->freq_range;
1673 max_bandwidth_khz = freq_range->max_bandwidth_khz;
1674 /* Check if auto calculation requested */
1675 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
1676 max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
1678 /* If we get a reg_rule we can assume that at least 5Mhz fit */
1679 if (!cfg80211_does_bw_fit_range(freq_range,
1680 MHZ_TO_KHZ(chan->center_freq),
1682 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1683 if (!cfg80211_does_bw_fit_range(freq_range,
1684 MHZ_TO_KHZ(chan->center_freq),
1686 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1688 if (max_bandwidth_khz < MHZ_TO_KHZ(10))
1689 bw_flags |= IEEE80211_CHAN_NO_10MHZ;
1690 if (max_bandwidth_khz < MHZ_TO_KHZ(20))
1691 bw_flags |= IEEE80211_CHAN_NO_20MHZ;
1692 if (max_bandwidth_khz < MHZ_TO_KHZ(40))
1693 bw_flags |= IEEE80211_CHAN_NO_HT40;
1694 if (max_bandwidth_khz < MHZ_TO_KHZ(80))
1695 bw_flags |= IEEE80211_CHAN_NO_80MHZ;
1696 if (max_bandwidth_khz < MHZ_TO_KHZ(160))
1697 bw_flags |= IEEE80211_CHAN_NO_160MHZ;
1702 * Note that right now we assume the desired channel bandwidth
1703 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
1704 * per channel, the primary and the extension channel).
1706 static void handle_channel(struct wiphy *wiphy,
1707 enum nl80211_reg_initiator initiator,
1708 struct ieee80211_channel *chan)
1710 u32 flags, bw_flags = 0;
1711 const struct ieee80211_reg_rule *reg_rule = NULL;
1712 const struct ieee80211_power_rule *power_rule = NULL;
1713 struct wiphy *request_wiphy = NULL;
1714 struct regulatory_request *lr = get_last_request();
1715 const struct ieee80211_regdomain *regd;
1717 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
1719 flags = chan->orig_flags;
1721 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
1722 if (IS_ERR(reg_rule)) {
1724 * We will disable all channels that do not match our
1725 * received regulatory rule unless the hint is coming
1726 * from a Country IE and the Country IE had no information
1727 * about a band. The IEEE 802.11 spec allows for an AP
1728 * to send only a subset of the regulatory rules allowed,
1729 * so an AP in the US that only supports 2.4 GHz may only send
1730 * a country IE with information for the 2.4 GHz band
1731 * while 5 GHz is still supported.
1733 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1734 PTR_ERR(reg_rule) == -ERANGE)
1737 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1738 request_wiphy && request_wiphy == wiphy &&
1739 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1740 pr_debug("Disabling freq %d MHz for good\n",
1742 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
1743 chan->flags = chan->orig_flags;
1745 pr_debug("Disabling freq %d MHz\n",
1747 chan->flags |= IEEE80211_CHAN_DISABLED;
1752 regd = reg_get_regdomain(wiphy);
1754 power_rule = ®_rule->power_rule;
1755 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
1757 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1758 request_wiphy && request_wiphy == wiphy &&
1759 request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
1761 * This guarantees the driver's requested regulatory domain
1762 * will always be used as a base for further regulatory
1765 chan->flags = chan->orig_flags =
1766 map_regdom_flags(reg_rule->flags) | bw_flags;
1767 chan->max_antenna_gain = chan->orig_mag =
1768 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1769 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
1770 (int) MBM_TO_DBM(power_rule->max_eirp);
1772 if (chan->flags & IEEE80211_CHAN_RADAR) {
1773 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1774 if (reg_rule->dfs_cac_ms)
1775 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1781 chan->dfs_state = NL80211_DFS_USABLE;
1782 chan->dfs_state_entered = jiffies;
1784 chan->beacon_found = false;
1785 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1786 chan->max_antenna_gain =
1787 min_t(int, chan->orig_mag,
1788 MBI_TO_DBI(power_rule->max_antenna_gain));
1789 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1791 if (chan->flags & IEEE80211_CHAN_RADAR) {
1792 if (reg_rule->dfs_cac_ms)
1793 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
1795 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1798 if (chan->orig_mpwr) {
1800 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1801 * will always follow the passed country IE power settings.
1803 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1804 wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
1805 chan->max_power = chan->max_reg_power;
1807 chan->max_power = min(chan->orig_mpwr,
1808 chan->max_reg_power);
1810 chan->max_power = chan->max_reg_power;
1813 static void handle_band(struct wiphy *wiphy,
1814 enum nl80211_reg_initiator initiator,
1815 struct ieee80211_supported_band *sband)
1822 for (i = 0; i < sband->n_channels; i++)
1823 handle_channel(wiphy, initiator, &sband->channels[i]);
1826 static bool reg_request_cell_base(struct regulatory_request *request)
1828 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
1830 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
1833 bool reg_last_request_cell_base(void)
1835 return reg_request_cell_base(get_last_request());
1838 #ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
1839 /* Core specific check */
1840 static enum reg_request_treatment
1841 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1843 struct regulatory_request *lr = get_last_request();
1845 if (!reg_num_devs_support_basehint)
1846 return REG_REQ_IGNORE;
1848 if (reg_request_cell_base(lr) &&
1849 !regdom_changes(pending_request->alpha2))
1850 return REG_REQ_ALREADY_SET;
1855 /* Device specific check */
1856 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1858 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
1861 static enum reg_request_treatment
1862 reg_ignore_cell_hint(struct regulatory_request *pending_request)
1864 return REG_REQ_IGNORE;
1867 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
1873 static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
1875 if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
1876 !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
1881 static bool ignore_reg_update(struct wiphy *wiphy,
1882 enum nl80211_reg_initiator initiator)
1884 struct regulatory_request *lr = get_last_request();
1886 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
1890 pr_debug("Ignoring regulatory request set by %s since last_request is not set\n",
1891 reg_initiator_name(initiator));
1895 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1896 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1897 pr_debug("Ignoring regulatory request set by %s since the driver uses its own custom regulatory domain\n",
1898 reg_initiator_name(initiator));
1903 * wiphy->regd will be set once the device has its own
1904 * desired regulatory domain set
1906 if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
1907 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1908 !is_world_regdom(lr->alpha2)) {
1909 pr_debug("Ignoring regulatory request set by %s since the driver requires its own regulatory domain to be set first\n",
1910 reg_initiator_name(initiator));
1914 if (reg_request_cell_base(lr))
1915 return reg_dev_ignore_cell_hint(wiphy);
1920 static bool reg_is_world_roaming(struct wiphy *wiphy)
1922 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1923 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1924 struct regulatory_request *lr = get_last_request();
1926 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1929 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1930 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
1936 static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
1937 struct reg_beacon *reg_beacon)
1939 struct ieee80211_supported_band *sband;
1940 struct ieee80211_channel *chan;
1941 bool channel_changed = false;
1942 struct ieee80211_channel chan_before;
1944 sband = wiphy->bands[reg_beacon->chan.band];
1945 chan = &sband->channels[chan_idx];
1947 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1950 if (chan->beacon_found)
1953 chan->beacon_found = true;
1955 if (!reg_is_world_roaming(wiphy))
1958 if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
1961 chan_before = *chan;
1963 if (chan->flags & IEEE80211_CHAN_NO_IR) {
1964 chan->flags &= ~IEEE80211_CHAN_NO_IR;
1965 channel_changed = true;
1968 if (channel_changed)
1969 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1973 * Called when a scan on a wiphy finds a beacon on
1976 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1977 struct reg_beacon *reg_beacon)
1980 struct ieee80211_supported_band *sband;
1982 if (!wiphy->bands[reg_beacon->chan.band])
1985 sband = wiphy->bands[reg_beacon->chan.band];
1987 for (i = 0; i < sband->n_channels; i++)
1988 handle_reg_beacon(wiphy, i, reg_beacon);
1992 * Called upon reg changes or a new wiphy is added
1994 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1997 struct ieee80211_supported_band *sband;
1998 struct reg_beacon *reg_beacon;
2000 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
2001 if (!wiphy->bands[reg_beacon->chan.band])
2003 sband = wiphy->bands[reg_beacon->chan.band];
2004 for (i = 0; i < sband->n_channels; i++)
2005 handle_reg_beacon(wiphy, i, reg_beacon);
2009 /* Reap the advantages of previously found beacons */
2010 static void reg_process_beacons(struct wiphy *wiphy)
2013 * Means we are just firing up cfg80211, so no beacons would
2014 * have been processed yet.
2018 wiphy_update_beacon_reg(wiphy);
2021 static bool is_ht40_allowed(struct ieee80211_channel *chan)
2025 if (chan->flags & IEEE80211_CHAN_DISABLED)
2027 /* This would happen when regulatory rules disallow HT40 completely */
2028 if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
2033 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
2034 struct ieee80211_channel *channel)
2036 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
2037 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
2038 const struct ieee80211_regdomain *regd;
2042 if (!is_ht40_allowed(channel)) {
2043 channel->flags |= IEEE80211_CHAN_NO_HT40;
2048 * We need to ensure the extension channels exist to
2049 * be able to use HT40- or HT40+, this finds them (or not)
2051 for (i = 0; i < sband->n_channels; i++) {
2052 struct ieee80211_channel *c = &sband->channels[i];
2054 if (c->center_freq == (channel->center_freq - 20))
2056 if (c->center_freq == (channel->center_freq + 20))
2061 regd = get_wiphy_regdom(wiphy);
2063 const struct ieee80211_reg_rule *reg_rule =
2064 freq_reg_info_regd(MHZ_TO_KHZ(channel->center_freq),
2065 regd, MHZ_TO_KHZ(20));
2067 if (!IS_ERR(reg_rule))
2068 flags = reg_rule->flags;
2072 * Please note that this assumes target bandwidth is 20 MHz,
2073 * if that ever changes we also need to change the below logic
2074 * to include that as well.
2076 if (!is_ht40_allowed(channel_before) ||
2077 flags & NL80211_RRF_NO_HT40MINUS)
2078 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
2080 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
2082 if (!is_ht40_allowed(channel_after) ||
2083 flags & NL80211_RRF_NO_HT40PLUS)
2084 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
2086 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
2089 static void reg_process_ht_flags_band(struct wiphy *wiphy,
2090 struct ieee80211_supported_band *sband)
2097 for (i = 0; i < sband->n_channels; i++)
2098 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
2101 static void reg_process_ht_flags(struct wiphy *wiphy)
2103 enum nl80211_band band;
2108 for (band = 0; band < NUM_NL80211_BANDS; band++)
2109 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
2112 static void reg_call_notifier(struct wiphy *wiphy,
2113 struct regulatory_request *request)
2115 if (wiphy->reg_notifier)
2116 wiphy->reg_notifier(wiphy, request);
2119 static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
2121 struct cfg80211_chan_def chandef;
2122 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2123 enum nl80211_iftype iftype;
2126 iftype = wdev->iftype;
2128 /* make sure the interface is active */
2129 if (!wdev->netdev || !netif_running(wdev->netdev))
2130 goto wdev_inactive_unlock;
2133 case NL80211_IFTYPE_AP:
2134 case NL80211_IFTYPE_P2P_GO:
2135 if (!wdev->beacon_interval)
2136 goto wdev_inactive_unlock;
2137 chandef = wdev->chandef;
2139 case NL80211_IFTYPE_ADHOC:
2140 if (!wdev->ssid_len)
2141 goto wdev_inactive_unlock;
2142 chandef = wdev->chandef;
2144 case NL80211_IFTYPE_STATION:
2145 case NL80211_IFTYPE_P2P_CLIENT:
2146 if (!wdev->current_bss ||
2147 !wdev->current_bss->pub.channel)
2148 goto wdev_inactive_unlock;
2150 if (!rdev->ops->get_channel ||
2151 rdev_get_channel(rdev, wdev, &chandef))
2152 cfg80211_chandef_create(&chandef,
2153 wdev->current_bss->pub.channel,
2154 NL80211_CHAN_NO_HT);
2156 case NL80211_IFTYPE_MONITOR:
2157 case NL80211_IFTYPE_AP_VLAN:
2158 case NL80211_IFTYPE_P2P_DEVICE:
2159 /* no enforcement required */
2162 /* others not implemented for now */
2170 case NL80211_IFTYPE_AP:
2171 case NL80211_IFTYPE_P2P_GO:
2172 case NL80211_IFTYPE_ADHOC:
2173 return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
2174 case NL80211_IFTYPE_STATION:
2175 case NL80211_IFTYPE_P2P_CLIENT:
2176 return cfg80211_chandef_usable(wiphy, &chandef,
2177 IEEE80211_CHAN_DISABLED);
2184 wdev_inactive_unlock:
2189 static void reg_leave_invalid_chans(struct wiphy *wiphy)
2191 struct wireless_dev *wdev;
2192 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2196 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
2197 if (!reg_wdev_chan_valid(wiphy, wdev))
2198 cfg80211_leave(rdev, wdev);
2201 static void reg_check_chans_work(struct work_struct *work)
2203 struct cfg80211_registered_device *rdev;
2205 pr_debug("Verifying active interfaces after reg change\n");
2208 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
2209 if (!(rdev->wiphy.regulatory_flags &
2210 REGULATORY_IGNORE_STALE_KICKOFF))
2211 reg_leave_invalid_chans(&rdev->wiphy);
2216 static void reg_check_channels(void)
2219 * Give usermode a chance to do something nicer (move to another
2220 * channel, orderly disconnection), before forcing a disconnection.
2222 mod_delayed_work(system_power_efficient_wq,
2224 msecs_to_jiffies(REG_ENFORCE_GRACE_MS));
2227 static void wiphy_update_regulatory(struct wiphy *wiphy,
2228 enum nl80211_reg_initiator initiator)
2230 enum nl80211_band band;
2231 struct regulatory_request *lr = get_last_request();
2233 if (ignore_reg_update(wiphy, initiator)) {
2235 * Regulatory updates set by CORE are ignored for custom
2236 * regulatory cards. Let us notify the changes to the driver,
2237 * as some drivers used this to restore its orig_* reg domain.
2239 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
2240 wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
2241 reg_call_notifier(wiphy, lr);
2245 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
2247 for (band = 0; band < NUM_NL80211_BANDS; band++)
2248 handle_band(wiphy, initiator, wiphy->bands[band]);
2250 reg_process_beacons(wiphy);
2251 reg_process_ht_flags(wiphy);
2252 reg_call_notifier(wiphy, lr);
2255 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
2257 struct cfg80211_registered_device *rdev;
2258 struct wiphy *wiphy;
2262 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2263 wiphy = &rdev->wiphy;
2264 wiphy_update_regulatory(wiphy, initiator);
2267 reg_check_channels();
2270 static void handle_channel_custom(struct wiphy *wiphy,
2271 struct ieee80211_channel *chan,
2272 const struct ieee80211_regdomain *regd)
2275 const struct ieee80211_reg_rule *reg_rule = NULL;
2276 const struct ieee80211_power_rule *power_rule = NULL;
2279 for (bw = MHZ_TO_KHZ(20); bw >= MHZ_TO_KHZ(5); bw = bw / 2) {
2280 reg_rule = freq_reg_info_regd(MHZ_TO_KHZ(chan->center_freq),
2282 if (!IS_ERR(reg_rule))
2286 if (IS_ERR(reg_rule)) {
2287 pr_debug("Disabling freq %d MHz as custom regd has no rule that fits it\n",
2289 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
2290 chan->flags |= IEEE80211_CHAN_DISABLED;
2292 chan->orig_flags |= IEEE80211_CHAN_DISABLED;
2293 chan->flags = chan->orig_flags;
2298 power_rule = ®_rule->power_rule;
2299 bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
2301 chan->dfs_state_entered = jiffies;
2302 chan->dfs_state = NL80211_DFS_USABLE;
2304 chan->beacon_found = false;
2306 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
2307 chan->flags = chan->orig_flags | bw_flags |
2308 map_regdom_flags(reg_rule->flags);
2310 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
2312 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
2313 chan->max_reg_power = chan->max_power =
2314 (int) MBM_TO_DBM(power_rule->max_eirp);
2316 if (chan->flags & IEEE80211_CHAN_RADAR) {
2317 if (reg_rule->dfs_cac_ms)
2318 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
2320 chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
2323 chan->max_power = chan->max_reg_power;
2326 static void handle_band_custom(struct wiphy *wiphy,
2327 struct ieee80211_supported_band *sband,
2328 const struct ieee80211_regdomain *regd)
2335 for (i = 0; i < sband->n_channels; i++)
2336 handle_channel_custom(wiphy, &sband->channels[i], regd);
2339 /* Used by drivers prior to wiphy registration */
2340 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
2341 const struct ieee80211_regdomain *regd)
2343 enum nl80211_band band;
2344 unsigned int bands_set = 0;
2346 WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
2347 "wiphy should have REGULATORY_CUSTOM_REG\n");
2348 wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
2350 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2351 if (!wiphy->bands[band])
2353 handle_band_custom(wiphy, wiphy->bands[band], regd);
2358 * no point in calling this if it won't have any effect
2359 * on your device's supported bands.
2361 WARN_ON(!bands_set);
2363 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
2365 static void reg_set_request_processed(void)
2367 bool need_more_processing = false;
2368 struct regulatory_request *lr = get_last_request();
2370 lr->processed = true;
2372 spin_lock(®_requests_lock);
2373 if (!list_empty(®_requests_list))
2374 need_more_processing = true;
2375 spin_unlock(®_requests_lock);
2377 cancel_crda_timeout();
2379 if (need_more_processing)
2380 schedule_work(®_work);
2384 * reg_process_hint_core - process core regulatory requests
2385 * @pending_request: a pending core regulatory request
2387 * The wireless subsystem can use this function to process
2388 * a regulatory request issued by the regulatory core.
2390 static enum reg_request_treatment
2391 reg_process_hint_core(struct regulatory_request *core_request)
2393 if (reg_query_database(core_request)) {
2394 core_request->intersect = false;
2395 core_request->processed = false;
2396 reg_update_last_request(core_request);
2400 return REG_REQ_IGNORE;
2403 static enum reg_request_treatment
2404 __reg_process_hint_user(struct regulatory_request *user_request)
2406 struct regulatory_request *lr = get_last_request();
2408 if (reg_request_cell_base(user_request))
2409 return reg_ignore_cell_hint(user_request);
2411 if (reg_request_cell_base(lr))
2412 return REG_REQ_IGNORE;
2414 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
2415 return REG_REQ_INTERSECT;
2417 * If the user knows better the user should set the regdom
2418 * to their country before the IE is picked up
2420 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
2422 return REG_REQ_IGNORE;
2424 * Process user requests only after previous user/driver/core
2425 * requests have been processed
2427 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
2428 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2429 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
2430 regdom_changes(lr->alpha2))
2431 return REG_REQ_IGNORE;
2433 if (!regdom_changes(user_request->alpha2))
2434 return REG_REQ_ALREADY_SET;
2440 * reg_process_hint_user - process user regulatory requests
2441 * @user_request: a pending user regulatory request
2443 * The wireless subsystem can use this function to process
2444 * a regulatory request initiated by userspace.
2446 static enum reg_request_treatment
2447 reg_process_hint_user(struct regulatory_request *user_request)
2449 enum reg_request_treatment treatment;
2451 treatment = __reg_process_hint_user(user_request);
2452 if (treatment == REG_REQ_IGNORE ||
2453 treatment == REG_REQ_ALREADY_SET)
2454 return REG_REQ_IGNORE;
2456 user_request->intersect = treatment == REG_REQ_INTERSECT;
2457 user_request->processed = false;
2459 if (reg_query_database(user_request)) {
2460 reg_update_last_request(user_request);
2461 user_alpha2[0] = user_request->alpha2[0];
2462 user_alpha2[1] = user_request->alpha2[1];
2466 return REG_REQ_IGNORE;
2469 static enum reg_request_treatment
2470 __reg_process_hint_driver(struct regulatory_request *driver_request)
2472 struct regulatory_request *lr = get_last_request();
2474 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
2475 if (regdom_changes(driver_request->alpha2))
2477 return REG_REQ_ALREADY_SET;
2481 * This would happen if you unplug and plug your card
2482 * back in or if you add a new device for which the previously
2483 * loaded card also agrees on the regulatory domain.
2485 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
2486 !regdom_changes(driver_request->alpha2))
2487 return REG_REQ_ALREADY_SET;
2489 return REG_REQ_INTERSECT;
2493 * reg_process_hint_driver - process driver regulatory requests
2494 * @driver_request: a pending driver regulatory request
2496 * The wireless subsystem can use this function to process
2497 * a regulatory request issued by an 802.11 driver.
2499 * Returns one of the different reg request treatment values.
2501 static enum reg_request_treatment
2502 reg_process_hint_driver(struct wiphy *wiphy,
2503 struct regulatory_request *driver_request)
2505 const struct ieee80211_regdomain *regd, *tmp;
2506 enum reg_request_treatment treatment;
2508 treatment = __reg_process_hint_driver(driver_request);
2510 switch (treatment) {
2513 case REG_REQ_IGNORE:
2514 return REG_REQ_IGNORE;
2515 case REG_REQ_INTERSECT:
2516 case REG_REQ_ALREADY_SET:
2517 regd = reg_copy_regd(get_cfg80211_regdom());
2519 return REG_REQ_IGNORE;
2521 tmp = get_wiphy_regdom(wiphy);
2522 rcu_assign_pointer(wiphy->regd, regd);
2523 rcu_free_regdom(tmp);
2527 driver_request->intersect = treatment == REG_REQ_INTERSECT;
2528 driver_request->processed = false;
2531 * Since CRDA will not be called in this case as we already
2532 * have applied the requested regulatory domain before we just
2533 * inform userspace we have processed the request
2535 if (treatment == REG_REQ_ALREADY_SET) {
2536 nl80211_send_reg_change_event(driver_request);
2537 reg_update_last_request(driver_request);
2538 reg_set_request_processed();
2539 return REG_REQ_ALREADY_SET;
2542 if (reg_query_database(driver_request)) {
2543 reg_update_last_request(driver_request);
2547 return REG_REQ_IGNORE;
2550 static enum reg_request_treatment
2551 __reg_process_hint_country_ie(struct wiphy *wiphy,
2552 struct regulatory_request *country_ie_request)
2554 struct wiphy *last_wiphy = NULL;
2555 struct regulatory_request *lr = get_last_request();
2557 if (reg_request_cell_base(lr)) {
2558 /* Trust a Cell base station over the AP's country IE */
2559 if (regdom_changes(country_ie_request->alpha2))
2560 return REG_REQ_IGNORE;
2561 return REG_REQ_ALREADY_SET;
2563 if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
2564 return REG_REQ_IGNORE;
2567 if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
2570 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
2573 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
2575 if (last_wiphy != wiphy) {
2577 * Two cards with two APs claiming different
2578 * Country IE alpha2s. We could
2579 * intersect them, but that seems unlikely
2580 * to be correct. Reject second one for now.
2582 if (regdom_changes(country_ie_request->alpha2))
2583 return REG_REQ_IGNORE;
2584 return REG_REQ_ALREADY_SET;
2587 if (regdom_changes(country_ie_request->alpha2))
2589 return REG_REQ_ALREADY_SET;
2593 * reg_process_hint_country_ie - process regulatory requests from country IEs
2594 * @country_ie_request: a regulatory request from a country IE
2596 * The wireless subsystem can use this function to process
2597 * a regulatory request issued by a country Information Element.
2599 * Returns one of the different reg request treatment values.
2601 static enum reg_request_treatment
2602 reg_process_hint_country_ie(struct wiphy *wiphy,
2603 struct regulatory_request *country_ie_request)
2605 enum reg_request_treatment treatment;
2607 treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
2609 switch (treatment) {
2612 case REG_REQ_IGNORE:
2613 return REG_REQ_IGNORE;
2614 case REG_REQ_ALREADY_SET:
2615 reg_free_request(country_ie_request);
2616 return REG_REQ_ALREADY_SET;
2617 case REG_REQ_INTERSECT:
2619 * This doesn't happen yet, not sure we
2620 * ever want to support it for this case.
2622 WARN_ONCE(1, "Unexpected intersection for country IEs");
2623 return REG_REQ_IGNORE;
2626 country_ie_request->intersect = false;
2627 country_ie_request->processed = false;
2629 if (reg_query_database(country_ie_request)) {
2630 reg_update_last_request(country_ie_request);
2634 return REG_REQ_IGNORE;
2637 bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2)
2639 const struct ieee80211_regdomain *wiphy1_regd = NULL;
2640 const struct ieee80211_regdomain *wiphy2_regd = NULL;
2641 const struct ieee80211_regdomain *cfg80211_regd = NULL;
2642 bool dfs_domain_same;
2646 cfg80211_regd = rcu_dereference(cfg80211_regdomain);
2647 wiphy1_regd = rcu_dereference(wiphy1->regd);
2649 wiphy1_regd = cfg80211_regd;
2651 wiphy2_regd = rcu_dereference(wiphy2->regd);
2653 wiphy2_regd = cfg80211_regd;
2655 dfs_domain_same = wiphy1_regd->dfs_region == wiphy2_regd->dfs_region;
2659 return dfs_domain_same;
2662 static void reg_copy_dfs_chan_state(struct ieee80211_channel *dst_chan,
2663 struct ieee80211_channel *src_chan)
2665 if (!(dst_chan->flags & IEEE80211_CHAN_RADAR) ||
2666 !(src_chan->flags & IEEE80211_CHAN_RADAR))
2669 if (dst_chan->flags & IEEE80211_CHAN_DISABLED ||
2670 src_chan->flags & IEEE80211_CHAN_DISABLED)
2673 if (src_chan->center_freq == dst_chan->center_freq &&
2674 dst_chan->dfs_state == NL80211_DFS_USABLE) {
2675 dst_chan->dfs_state = src_chan->dfs_state;
2676 dst_chan->dfs_state_entered = src_chan->dfs_state_entered;
2680 static void wiphy_share_dfs_chan_state(struct wiphy *dst_wiphy,
2681 struct wiphy *src_wiphy)
2683 struct ieee80211_supported_band *src_sband, *dst_sband;
2684 struct ieee80211_channel *src_chan, *dst_chan;
2687 if (!reg_dfs_domain_same(dst_wiphy, src_wiphy))
2690 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2691 dst_sband = dst_wiphy->bands[band];
2692 src_sband = src_wiphy->bands[band];
2693 if (!dst_sband || !src_sband)
2696 for (i = 0; i < dst_sband->n_channels; i++) {
2697 dst_chan = &dst_sband->channels[i];
2698 for (j = 0; j < src_sband->n_channels; j++) {
2699 src_chan = &src_sband->channels[j];
2700 reg_copy_dfs_chan_state(dst_chan, src_chan);
2706 static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy)
2708 struct cfg80211_registered_device *rdev;
2712 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2713 if (wiphy == &rdev->wiphy)
2715 wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy);
2719 /* This processes *all* regulatory hints */
2720 static void reg_process_hint(struct regulatory_request *reg_request)
2722 struct wiphy *wiphy = NULL;
2723 enum reg_request_treatment treatment;
2725 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
2726 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
2728 switch (reg_request->initiator) {
2729 case NL80211_REGDOM_SET_BY_CORE:
2730 treatment = reg_process_hint_core(reg_request);
2732 case NL80211_REGDOM_SET_BY_USER:
2733 treatment = reg_process_hint_user(reg_request);
2735 case NL80211_REGDOM_SET_BY_DRIVER:
2738 treatment = reg_process_hint_driver(wiphy, reg_request);
2740 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
2743 treatment = reg_process_hint_country_ie(wiphy, reg_request);
2746 WARN(1, "invalid initiator %d\n", reg_request->initiator);
2750 if (treatment == REG_REQ_IGNORE)
2753 WARN(treatment != REG_REQ_OK && treatment != REG_REQ_ALREADY_SET,
2754 "unexpected treatment value %d\n", treatment);
2756 /* This is required so that the orig_* parameters are saved.
2757 * NOTE: treatment must be set for any case that reaches here!
2759 if (treatment == REG_REQ_ALREADY_SET && wiphy &&
2760 wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
2761 wiphy_update_regulatory(wiphy, reg_request->initiator);
2762 wiphy_all_share_dfs_chan_state(wiphy);
2763 reg_check_channels();
2769 reg_free_request(reg_request);
2772 static bool reg_only_self_managed_wiphys(void)
2774 struct cfg80211_registered_device *rdev;
2775 struct wiphy *wiphy;
2776 bool self_managed_found = false;
2780 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2781 wiphy = &rdev->wiphy;
2782 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
2783 self_managed_found = true;
2788 /* make sure at least one self-managed wiphy exists */
2789 return self_managed_found;
2793 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
2794 * Regulatory hints come on a first come first serve basis and we
2795 * must process each one atomically.
2797 static void reg_process_pending_hints(void)
2799 struct regulatory_request *reg_request, *lr;
2801 lr = get_last_request();
2803 /* When last_request->processed becomes true this will be rescheduled */
2804 if (lr && !lr->processed) {
2805 reg_process_hint(lr);
2809 spin_lock(®_requests_lock);
2811 if (list_empty(®_requests_list)) {
2812 spin_unlock(®_requests_lock);
2816 reg_request = list_first_entry(®_requests_list,
2817 struct regulatory_request,
2819 list_del_init(®_request->list);
2821 spin_unlock(®_requests_lock);
2823 if (reg_only_self_managed_wiphys()) {
2824 reg_free_request(reg_request);
2828 reg_process_hint(reg_request);
2830 lr = get_last_request();
2832 spin_lock(®_requests_lock);
2833 if (!list_empty(®_requests_list) && lr && lr->processed)
2834 schedule_work(®_work);
2835 spin_unlock(®_requests_lock);
2838 /* Processes beacon hints -- this has nothing to do with country IEs */
2839 static void reg_process_pending_beacon_hints(void)
2841 struct cfg80211_registered_device *rdev;
2842 struct reg_beacon *pending_beacon, *tmp;
2844 /* This goes through the _pending_ beacon list */
2845 spin_lock_bh(®_pending_beacons_lock);
2847 list_for_each_entry_safe(pending_beacon, tmp,
2848 ®_pending_beacons, list) {
2849 list_del_init(&pending_beacon->list);
2851 /* Applies the beacon hint to current wiphys */
2852 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
2853 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
2855 /* Remembers the beacon hint for new wiphys or reg changes */
2856 list_add_tail(&pending_beacon->list, ®_beacon_list);
2859 spin_unlock_bh(®_pending_beacons_lock);
2862 static void reg_process_self_managed_hints(void)
2864 struct cfg80211_registered_device *rdev;
2865 struct wiphy *wiphy;
2866 const struct ieee80211_regdomain *tmp;
2867 const struct ieee80211_regdomain *regd;
2868 enum nl80211_band band;
2869 struct regulatory_request request = {};
2871 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
2872 wiphy = &rdev->wiphy;
2874 spin_lock(®_requests_lock);
2875 regd = rdev->requested_regd;
2876 rdev->requested_regd = NULL;
2877 spin_unlock(®_requests_lock);
2882 tmp = get_wiphy_regdom(wiphy);
2883 rcu_assign_pointer(wiphy->regd, regd);
2884 rcu_free_regdom(tmp);
2886 for (band = 0; band < NUM_NL80211_BANDS; band++)
2887 handle_band_custom(wiphy, wiphy->bands[band], regd);
2889 reg_process_ht_flags(wiphy);
2891 request.wiphy_idx = get_wiphy_idx(wiphy);
2892 request.alpha2[0] = regd->alpha2[0];
2893 request.alpha2[1] = regd->alpha2[1];
2894 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
2896 nl80211_send_wiphy_reg_change_event(&request);
2899 reg_check_channels();
2902 static void reg_todo(struct work_struct *work)
2905 reg_process_pending_hints();
2906 reg_process_pending_beacon_hints();
2907 reg_process_self_managed_hints();
2911 static void queue_regulatory_request(struct regulatory_request *request)
2913 request->alpha2[0] = toupper(request->alpha2[0]);
2914 request->alpha2[1] = toupper(request->alpha2[1]);
2916 spin_lock(®_requests_lock);
2917 list_add_tail(&request->list, ®_requests_list);
2918 spin_unlock(®_requests_lock);
2920 schedule_work(®_work);
2924 * Core regulatory hint -- happens during cfg80211_init()
2925 * and when we restore regulatory settings.
2927 static int regulatory_hint_core(const char *alpha2)
2929 struct regulatory_request *request;
2931 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2935 request->alpha2[0] = alpha2[0];
2936 request->alpha2[1] = alpha2[1];
2937 request->initiator = NL80211_REGDOM_SET_BY_CORE;
2939 queue_regulatory_request(request);
2945 int regulatory_hint_user(const char *alpha2,
2946 enum nl80211_user_reg_hint_type user_reg_hint_type)
2948 struct regulatory_request *request;
2950 if (WARN_ON(!alpha2))
2953 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
2957 request->wiphy_idx = WIPHY_IDX_INVALID;
2958 request->alpha2[0] = alpha2[0];
2959 request->alpha2[1] = alpha2[1];
2960 request->initiator = NL80211_REGDOM_SET_BY_USER;
2961 request->user_reg_hint_type = user_reg_hint_type;
2963 /* Allow calling CRDA again */
2964 reset_crda_timeouts();
2966 queue_regulatory_request(request);
2971 int regulatory_hint_indoor(bool is_indoor, u32 portid)
2973 spin_lock(®_indoor_lock);
2975 /* It is possible that more than one user space process is trying to
2976 * configure the indoor setting. To handle such cases, clear the indoor
2977 * setting in case that some process does not think that the device
2978 * is operating in an indoor environment. In addition, if a user space
2979 * process indicates that it is controlling the indoor setting, save its
2980 * portid, i.e., make it the owner.
2982 reg_is_indoor = is_indoor;
2983 if (reg_is_indoor) {
2984 if (!reg_is_indoor_portid)
2985 reg_is_indoor_portid = portid;
2987 reg_is_indoor_portid = 0;
2990 spin_unlock(®_indoor_lock);
2993 reg_check_channels();
2998 void regulatory_netlink_notify(u32 portid)
3000 spin_lock(®_indoor_lock);
3002 if (reg_is_indoor_portid != portid) {
3003 spin_unlock(®_indoor_lock);
3007 reg_is_indoor = false;
3008 reg_is_indoor_portid = 0;
3010 spin_unlock(®_indoor_lock);
3012 reg_check_channels();
3016 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
3018 struct regulatory_request *request;
3020 if (WARN_ON(!alpha2 || !wiphy))
3023 wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
3025 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
3029 request->wiphy_idx = get_wiphy_idx(wiphy);
3031 request->alpha2[0] = alpha2[0];
3032 request->alpha2[1] = alpha2[1];
3033 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
3035 /* Allow calling CRDA again */
3036 reset_crda_timeouts();
3038 queue_regulatory_request(request);
3042 EXPORT_SYMBOL(regulatory_hint);
3044 void regulatory_hint_country_ie(struct wiphy *wiphy, enum nl80211_band band,
3045 const u8 *country_ie, u8 country_ie_len)
3048 enum environment_cap env = ENVIRON_ANY;
3049 struct regulatory_request *request = NULL, *lr;
3051 /* IE len must be evenly divisible by 2 */
3052 if (country_ie_len & 0x01)
3055 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
3058 request = kzalloc(sizeof(*request), GFP_KERNEL);
3062 alpha2[0] = country_ie[0];
3063 alpha2[1] = country_ie[1];
3065 if (country_ie[2] == 'I')
3066 env = ENVIRON_INDOOR;
3067 else if (country_ie[2] == 'O')
3068 env = ENVIRON_OUTDOOR;
3071 lr = get_last_request();
3077 * We will run this only upon a successful connection on cfg80211.
3078 * We leave conflict resolution to the workqueue, where can hold
3081 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
3082 lr->wiphy_idx != WIPHY_IDX_INVALID)
3085 request->wiphy_idx = get_wiphy_idx(wiphy);
3086 request->alpha2[0] = alpha2[0];
3087 request->alpha2[1] = alpha2[1];
3088 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
3089 request->country_ie_env = env;
3091 /* Allow calling CRDA again */
3092 reset_crda_timeouts();
3094 queue_regulatory_request(request);
3101 static void restore_alpha2(char *alpha2, bool reset_user)
3103 /* indicates there is no alpha2 to consider for restoration */
3107 /* The user setting has precedence over the module parameter */
3108 if (is_user_regdom_saved()) {
3109 /* Unless we're asked to ignore it and reset it */
3111 pr_debug("Restoring regulatory settings including user preference\n");
3112 user_alpha2[0] = '9';
3113 user_alpha2[1] = '7';
3116 * If we're ignoring user settings, we still need to
3117 * check the module parameter to ensure we put things
3118 * back as they were for a full restore.
3120 if (!is_world_regdom(ieee80211_regdom)) {
3121 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
3122 ieee80211_regdom[0], ieee80211_regdom[1]);
3123 alpha2[0] = ieee80211_regdom[0];
3124 alpha2[1] = ieee80211_regdom[1];
3127 pr_debug("Restoring regulatory settings while preserving user preference for: %c%c\n",
3128 user_alpha2[0], user_alpha2[1]);
3129 alpha2[0] = user_alpha2[0];
3130 alpha2[1] = user_alpha2[1];
3132 } else if (!is_world_regdom(ieee80211_regdom)) {
3133 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
3134 ieee80211_regdom[0], ieee80211_regdom[1]);
3135 alpha2[0] = ieee80211_regdom[0];
3136 alpha2[1] = ieee80211_regdom[1];
3138 pr_debug("Restoring regulatory settings\n");
3141 static void restore_custom_reg_settings(struct wiphy *wiphy)
3143 struct ieee80211_supported_band *sband;
3144 enum nl80211_band band;
3145 struct ieee80211_channel *chan;
3148 for (band = 0; band < NUM_NL80211_BANDS; band++) {
3149 sband = wiphy->bands[band];
3152 for (i = 0; i < sband->n_channels; i++) {
3153 chan = &sband->channels[i];
3154 chan->flags = chan->orig_flags;
3155 chan->max_antenna_gain = chan->orig_mag;
3156 chan->max_power = chan->orig_mpwr;
3157 chan->beacon_found = false;
3163 * Restoring regulatory settings involves ingoring any
3164 * possibly stale country IE information and user regulatory
3165 * settings if so desired, this includes any beacon hints
3166 * learned as we could have traveled outside to another country
3167 * after disconnection. To restore regulatory settings we do
3168 * exactly what we did at bootup:
3170 * - send a core regulatory hint
3171 * - send a user regulatory hint if applicable
3173 * Device drivers that send a regulatory hint for a specific country
3174 * keep their own regulatory domain on wiphy->regd so that does does
3175 * not need to be remembered.
3177 static void restore_regulatory_settings(bool reset_user)
3180 char world_alpha2[2];
3181 struct reg_beacon *reg_beacon, *btmp;
3182 LIST_HEAD(tmp_reg_req_list);
3183 struct cfg80211_registered_device *rdev;
3188 * Clear the indoor setting in case that it is not controlled by user
3189 * space, as otherwise there is no guarantee that the device is still
3190 * operating in an indoor environment.
3192 spin_lock(®_indoor_lock);
3193 if (reg_is_indoor && !reg_is_indoor_portid) {
3194 reg_is_indoor = false;
3195 reg_check_channels();
3197 spin_unlock(®_indoor_lock);
3199 reset_regdomains(true, &world_regdom);
3200 restore_alpha2(alpha2, reset_user);
3203 * If there's any pending requests we simply
3204 * stash them to a temporary pending queue and
3205 * add then after we've restored regulatory
3208 spin_lock(®_requests_lock);
3209 list_splice_tail_init(®_requests_list, &tmp_reg_req_list);
3210 spin_unlock(®_requests_lock);
3212 /* Clear beacon hints */
3213 spin_lock_bh(®_pending_beacons_lock);
3214 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
3215 list_del(®_beacon->list);
3218 spin_unlock_bh(®_pending_beacons_lock);
3220 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
3221 list_del(®_beacon->list);
3225 /* First restore to the basic regulatory settings */
3226 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
3227 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
3229 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
3230 if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
3232 if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
3233 restore_custom_reg_settings(&rdev->wiphy);
3236 regulatory_hint_core(world_alpha2);
3239 * This restores the ieee80211_regdom module parameter
3240 * preference or the last user requested regulatory
3241 * settings, user regulatory settings takes precedence.
3243 if (is_an_alpha2(alpha2))
3244 regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER);
3246 spin_lock(®_requests_lock);
3247 list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
3248 spin_unlock(®_requests_lock);
3250 pr_debug("Kicking the queue\n");
3252 schedule_work(®_work);
3255 void regulatory_hint_disconnect(void)
3257 pr_debug("All devices are disconnected, going to restore regulatory settings\n");
3258 restore_regulatory_settings(false);
3261 static bool freq_is_chan_12_13_14(u16 freq)
3263 if (freq == ieee80211_channel_to_frequency(12, NL80211_BAND_2GHZ) ||
3264 freq == ieee80211_channel_to_frequency(13, NL80211_BAND_2GHZ) ||
3265 freq == ieee80211_channel_to_frequency(14, NL80211_BAND_2GHZ))
3270 static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
3272 struct reg_beacon *pending_beacon;
3274 list_for_each_entry(pending_beacon, ®_pending_beacons, list)
3275 if (beacon_chan->center_freq ==
3276 pending_beacon->chan.center_freq)
3281 int regulatory_hint_found_beacon(struct wiphy *wiphy,
3282 struct ieee80211_channel *beacon_chan,
3285 struct reg_beacon *reg_beacon;
3288 if (beacon_chan->beacon_found ||
3289 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
3290 (beacon_chan->band == NL80211_BAND_2GHZ &&
3291 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
3294 spin_lock_bh(®_pending_beacons_lock);
3295 processing = pending_reg_beacon(beacon_chan);
3296 spin_unlock_bh(®_pending_beacons_lock);
3301 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
3305 pr_debug("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
3306 beacon_chan->center_freq,
3307 ieee80211_frequency_to_channel(beacon_chan->center_freq),
3310 memcpy(®_beacon->chan, beacon_chan,
3311 sizeof(struct ieee80211_channel));
3314 * Since we can be called from BH or and non-BH context
3315 * we must use spin_lock_bh()
3317 spin_lock_bh(®_pending_beacons_lock);
3318 list_add_tail(®_beacon->list, ®_pending_beacons);
3319 spin_unlock_bh(®_pending_beacons_lock);
3321 schedule_work(®_work);
3326 static void print_rd_rules(const struct ieee80211_regdomain *rd)
3329 const struct ieee80211_reg_rule *reg_rule = NULL;
3330 const struct ieee80211_freq_range *freq_range = NULL;
3331 const struct ieee80211_power_rule *power_rule = NULL;
3332 char bw[32], cac_time[32];
3334 pr_debug(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
3336 for (i = 0; i < rd->n_reg_rules; i++) {
3337 reg_rule = &rd->reg_rules[i];
3338 freq_range = ®_rule->freq_range;
3339 power_rule = ®_rule->power_rule;
3341 if (reg_rule->flags & NL80211_RRF_AUTO_BW)
3342 snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
3343 freq_range->max_bandwidth_khz,
3344 reg_get_max_bandwidth(rd, reg_rule));
3346 snprintf(bw, sizeof(bw), "%d KHz",
3347 freq_range->max_bandwidth_khz);
3349 if (reg_rule->flags & NL80211_RRF_DFS)
3350 scnprintf(cac_time, sizeof(cac_time), "%u s",
3351 reg_rule->dfs_cac_ms/1000);
3353 scnprintf(cac_time, sizeof(cac_time), "N/A");
3357 * There may not be documentation for max antenna gain
3358 * in certain regions
3360 if (power_rule->max_antenna_gain)
3361 pr_debug(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
3362 freq_range->start_freq_khz,
3363 freq_range->end_freq_khz,
3365 power_rule->max_antenna_gain,
3366 power_rule->max_eirp,
3369 pr_debug(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
3370 freq_range->start_freq_khz,
3371 freq_range->end_freq_khz,
3373 power_rule->max_eirp,
3378 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
3380 switch (dfs_region) {
3381 case NL80211_DFS_UNSET:
3382 case NL80211_DFS_FCC:
3383 case NL80211_DFS_ETSI:
3384 case NL80211_DFS_JP:
3387 pr_debug("Ignoring uknown DFS master region: %d\n", dfs_region);
3392 static void print_regdomain(const struct ieee80211_regdomain *rd)
3394 struct regulatory_request *lr = get_last_request();
3396 if (is_intersected_alpha2(rd->alpha2)) {
3397 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
3398 struct cfg80211_registered_device *rdev;
3399 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
3401 pr_debug("Current regulatory domain updated by AP to: %c%c\n",
3402 rdev->country_ie_alpha2[0],
3403 rdev->country_ie_alpha2[1]);
3405 pr_debug("Current regulatory domain intersected:\n");
3407 pr_debug("Current regulatory domain intersected:\n");
3408 } else if (is_world_regdom(rd->alpha2)) {
3409 pr_debug("World regulatory domain updated:\n");
3411 if (is_unknown_alpha2(rd->alpha2))
3412 pr_debug("Regulatory domain changed to driver built-in settings (unknown country)\n");
3414 if (reg_request_cell_base(lr))
3415 pr_debug("Regulatory domain changed to country: %c%c by Cell Station\n",
3416 rd->alpha2[0], rd->alpha2[1]);
3418 pr_debug("Regulatory domain changed to country: %c%c\n",
3419 rd->alpha2[0], rd->alpha2[1]);
3423 pr_debug(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
3427 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
3429 pr_debug("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
3433 static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
3435 if (!is_world_regdom(rd->alpha2))
3437 update_world_regdomain(rd);
3441 static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
3442 struct regulatory_request *user_request)
3444 const struct ieee80211_regdomain *intersected_rd = NULL;
3446 if (!regdom_changes(rd->alpha2))
3449 if (!is_valid_rd(rd)) {
3450 pr_err("Invalid regulatory domain detected: %c%c\n",
3451 rd->alpha2[0], rd->alpha2[1]);
3452 print_regdomain_info(rd);
3456 if (!user_request->intersect) {
3457 reset_regdomains(false, rd);
3461 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
3462 if (!intersected_rd)
3467 reset_regdomains(false, intersected_rd);
3472 static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
3473 struct regulatory_request *driver_request)
3475 const struct ieee80211_regdomain *regd;
3476 const struct ieee80211_regdomain *intersected_rd = NULL;
3477 const struct ieee80211_regdomain *tmp;
3478 struct wiphy *request_wiphy;
3480 if (is_world_regdom(rd->alpha2))
3483 if (!regdom_changes(rd->alpha2))
3486 if (!is_valid_rd(rd)) {
3487 pr_err("Invalid regulatory domain detected: %c%c\n",
3488 rd->alpha2[0], rd->alpha2[1]);
3489 print_regdomain_info(rd);
3493 request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
3497 if (!driver_request->intersect) {
3498 if (request_wiphy->regd)
3501 regd = reg_copy_regd(rd);
3503 return PTR_ERR(regd);
3505 rcu_assign_pointer(request_wiphy->regd, regd);
3506 reset_regdomains(false, rd);
3510 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
3511 if (!intersected_rd)
3515 * We can trash what CRDA provided now.
3516 * However if a driver requested this specific regulatory
3517 * domain we keep it for its private use
3519 tmp = get_wiphy_regdom(request_wiphy);
3520 rcu_assign_pointer(request_wiphy->regd, rd);
3521 rcu_free_regdom(tmp);
3525 reset_regdomains(false, intersected_rd);
3530 static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
3531 struct regulatory_request *country_ie_request)
3533 struct wiphy *request_wiphy;
3535 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
3536 !is_unknown_alpha2(rd->alpha2))
3540 * Lets only bother proceeding on the same alpha2 if the current
3541 * rd is non static (it means CRDA was present and was used last)
3542 * and the pending request came in from a country IE
3545 if (!is_valid_rd(rd)) {
3546 pr_err("Invalid regulatory domain detected: %c%c\n",
3547 rd->alpha2[0], rd->alpha2[1]);
3548 print_regdomain_info(rd);
3552 request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
3556 if (country_ie_request->intersect)
3559 reset_regdomains(false, rd);
3564 * Use this call to set the current regulatory domain. Conflicts with
3565 * multiple drivers can be ironed out later. Caller must've already
3566 * kmalloc'd the rd structure.
3568 int set_regdom(const struct ieee80211_regdomain *rd,
3569 enum ieee80211_regd_source regd_src)
3571 struct regulatory_request *lr;
3572 bool user_reset = false;
3575 if (!reg_is_valid_request(rd->alpha2)) {
3580 if (regd_src == REGD_SOURCE_CRDA)
3581 reset_crda_timeouts();
3583 lr = get_last_request();
3585 /* Note that this doesn't update the wiphys, this is done below */
3586 switch (lr->initiator) {
3587 case NL80211_REGDOM_SET_BY_CORE:
3588 r = reg_set_rd_core(rd);
3590 case NL80211_REGDOM_SET_BY_USER:
3591 r = reg_set_rd_user(rd, lr);
3594 case NL80211_REGDOM_SET_BY_DRIVER:
3595 r = reg_set_rd_driver(rd, lr);
3597 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
3598 r = reg_set_rd_country_ie(rd, lr);
3601 WARN(1, "invalid initiator %d\n", lr->initiator);
3609 reg_set_request_processed();
3612 /* Back to world regulatory in case of errors */
3613 restore_regulatory_settings(user_reset);
3620 /* This would make this whole thing pointless */
3621 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
3624 /* update all wiphys now with the new established regulatory domain */
3625 update_all_wiphy_regulatory(lr->initiator);
3627 print_regdomain(get_cfg80211_regdom());
3629 nl80211_send_reg_change_event(lr);
3631 reg_set_request_processed();
3636 static int __regulatory_set_wiphy_regd(struct wiphy *wiphy,
3637 struct ieee80211_regdomain *rd)
3639 const struct ieee80211_regdomain *regd;
3640 const struct ieee80211_regdomain *prev_regd;
3641 struct cfg80211_registered_device *rdev;
3643 if (WARN_ON(!wiphy || !rd))
3646 if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED),
3647 "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n"))
3650 if (WARN(!is_valid_rd(rd), "Invalid regulatory domain detected\n")) {
3651 print_regdomain_info(rd);
3655 regd = reg_copy_regd(rd);
3657 return PTR_ERR(regd);
3659 rdev = wiphy_to_rdev(wiphy);
3661 spin_lock(®_requests_lock);
3662 prev_regd = rdev->requested_regd;
3663 rdev->requested_regd = regd;
3664 spin_unlock(®_requests_lock);
3670 int regulatory_set_wiphy_regd(struct wiphy *wiphy,
3671 struct ieee80211_regdomain *rd)
3673 int ret = __regulatory_set_wiphy_regd(wiphy, rd);
3678 schedule_work(®_work);
3681 EXPORT_SYMBOL(regulatory_set_wiphy_regd);
3683 int regulatory_set_wiphy_regd_sync_rtnl(struct wiphy *wiphy,
3684 struct ieee80211_regdomain *rd)
3690 ret = __regulatory_set_wiphy_regd(wiphy, rd);
3694 /* process the request immediately */
3695 reg_process_self_managed_hints();
3698 EXPORT_SYMBOL(regulatory_set_wiphy_regd_sync_rtnl);
3700 void wiphy_regulatory_register(struct wiphy *wiphy)
3702 struct regulatory_request *lr;
3704 /* self-managed devices ignore external hints */
3705 if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
3706 wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS |
3707 REGULATORY_COUNTRY_IE_IGNORE;
3709 if (!reg_dev_ignore_cell_hint(wiphy))
3710 reg_num_devs_support_basehint++;
3712 lr = get_last_request();
3713 wiphy_update_regulatory(wiphy, lr->initiator);
3714 wiphy_all_share_dfs_chan_state(wiphy);
3717 void wiphy_regulatory_deregister(struct wiphy *wiphy)
3719 struct wiphy *request_wiphy = NULL;
3720 struct regulatory_request *lr;
3722 lr = get_last_request();
3724 if (!reg_dev_ignore_cell_hint(wiphy))
3725 reg_num_devs_support_basehint--;
3727 rcu_free_regdom(get_wiphy_regdom(wiphy));
3728 RCU_INIT_POINTER(wiphy->regd, NULL);
3731 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
3733 if (!request_wiphy || request_wiphy != wiphy)
3736 lr->wiphy_idx = WIPHY_IDX_INVALID;
3737 lr->country_ie_env = ENVIRON_ANY;
3741 * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for
3742 * UNII band definitions
3744 int cfg80211_get_unii(int freq)
3747 if (freq >= 5150 && freq <= 5250)
3751 if (freq > 5250 && freq <= 5350)
3755 if (freq > 5350 && freq <= 5470)
3759 if (freq > 5470 && freq <= 5725)
3763 if (freq > 5725 && freq <= 5825)
3769 bool regulatory_indoor_allowed(void)
3771 return reg_is_indoor;
3774 bool regulatory_pre_cac_allowed(struct wiphy *wiphy)
3776 const struct ieee80211_regdomain *regd = NULL;
3777 const struct ieee80211_regdomain *wiphy_regd = NULL;
3778 bool pre_cac_allowed = false;
3782 regd = rcu_dereference(cfg80211_regdomain);
3783 wiphy_regd = rcu_dereference(wiphy->regd);
3785 if (regd->dfs_region == NL80211_DFS_ETSI)
3786 pre_cac_allowed = true;
3790 return pre_cac_allowed;
3793 if (regd->dfs_region == wiphy_regd->dfs_region &&
3794 wiphy_regd->dfs_region == NL80211_DFS_ETSI)
3795 pre_cac_allowed = true;
3799 return pre_cac_allowed;
3802 void regulatory_propagate_dfs_state(struct wiphy *wiphy,
3803 struct cfg80211_chan_def *chandef,
3804 enum nl80211_dfs_state dfs_state,
3805 enum nl80211_radar_event event)
3807 struct cfg80211_registered_device *rdev;
3811 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
3814 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
3815 if (wiphy == &rdev->wiphy)
3818 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
3821 if (!ieee80211_get_channel(&rdev->wiphy,
3822 chandef->chan->center_freq))
3825 cfg80211_set_dfs_state(&rdev->wiphy, chandef, dfs_state);
3827 if (event == NL80211_RADAR_DETECTED ||
3828 event == NL80211_RADAR_CAC_FINISHED)
3829 cfg80211_sched_dfs_chan_update(rdev);
3831 nl80211_radar_notify(rdev, chandef, event, NULL, GFP_KERNEL);
3835 static int __init regulatory_init_db(void)
3839 err = load_builtin_regdb_keys();
3843 /* We always try to get an update for the static regdomain */
3844 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
3846 if (err == -ENOMEM) {
3847 platform_device_unregister(reg_pdev);
3851 * N.B. kobject_uevent_env() can fail mainly for when we're out
3852 * memory which is handled and propagated appropriately above
3853 * but it can also fail during a netlink_broadcast() or during
3854 * early boot for call_usermodehelper(). For now treat these
3855 * errors as non-fatal.
3857 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
3861 * Finally, if the user set the module parameter treat it
3864 if (!is_world_regdom(ieee80211_regdom))
3865 regulatory_hint_user(ieee80211_regdom,
3866 NL80211_USER_REG_HINT_USER);
3871 late_initcall(regulatory_init_db);
3874 int __init regulatory_init(void)
3876 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
3877 if (IS_ERR(reg_pdev))
3878 return PTR_ERR(reg_pdev);
3880 spin_lock_init(®_requests_lock);
3881 spin_lock_init(®_pending_beacons_lock);
3882 spin_lock_init(®_indoor_lock);
3884 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
3886 user_alpha2[0] = '9';
3887 user_alpha2[1] = '7';
3890 return regulatory_init_db();
3896 void regulatory_exit(void)
3898 struct regulatory_request *reg_request, *tmp;
3899 struct reg_beacon *reg_beacon, *btmp;
3901 cancel_work_sync(®_work);
3902 cancel_crda_timeout_sync();
3903 cancel_delayed_work_sync(®_check_chans);
3905 /* Lock to suppress warnings */
3907 reset_regdomains(true, NULL);
3910 dev_set_uevent_suppress(®_pdev->dev, true);
3912 platform_device_unregister(reg_pdev);
3914 list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
3915 list_del(®_beacon->list);
3919 list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
3920 list_del(®_beacon->list);
3924 list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
3925 list_del(®_request->list);
3929 if (!IS_ERR_OR_NULL(regdb))
3932 free_regdb_keyring();