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 Luis R. Rodriguez <lrodriguz@atheros.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
13 * DOC: Wireless regulatory infrastructure
15 * The usual implementation is for a driver to read a device EEPROM to
16 * determine which regulatory domain it should be operating under, then
17 * looking up the allowable channels in a driver-local table and finally
18 * registering those channels in the wiphy structure.
20 * Another set of compliance enforcement is for drivers to use their
21 * own compliance limits which can be stored on the EEPROM. The host
22 * driver or firmware may ensure these are used.
24 * In addition to all this we provide an extra layer of regulatory
25 * conformance. For drivers which do not have any regulatory
26 * information CRDA provides the complete regulatory solution.
27 * For others it provides a community effort on further restrictions
28 * to enhance compliance.
30 * Note: When number of rules --> infinity we will not be able to
31 * index on alpha2 any more, instead we'll probably have to
32 * rely on some SHA1 checksum of the regdomain for example.
35 #include <linux/kernel.h>
36 #include <linux/slab.h>
37 #include <linux/list.h>
38 #include <linux/random.h>
39 #include <linux/ctype.h>
40 #include <linux/nl80211.h>
41 #include <linux/platform_device.h>
42 #include <net/cfg80211.h>
48 #ifdef CONFIG_CFG80211_REG_DEBUG
49 #define REG_DBG_PRINT(format, args...) \
51 printk(KERN_DEBUG "cfg80211: " format , ## args); \
54 #define REG_DBG_PRINT(args...)
57 /* Receipt of information from last regulatory request */
58 static struct regulatory_request *last_request;
60 /* To trigger userspace events */
61 static struct platform_device *reg_pdev;
64 * Central wireless core regulatory domains, we only need two,
65 * the current one and a world regulatory domain in case we have no
66 * information to give us an alpha2
68 const struct ieee80211_regdomain *cfg80211_regdomain;
71 * Protects static reg.c components:
72 * - cfg80211_world_regdom
76 static DEFINE_MUTEX(reg_mutex);
78 static inline void assert_reg_lock(void)
80 lockdep_assert_held(®_mutex);
83 /* Used to queue up regulatory hints */
84 static LIST_HEAD(reg_requests_list);
85 static spinlock_t reg_requests_lock;
87 /* Used to queue up beacon hints for review */
88 static LIST_HEAD(reg_pending_beacons);
89 static spinlock_t reg_pending_beacons_lock;
91 /* Used to keep track of processed beacon hints */
92 static LIST_HEAD(reg_beacon_list);
95 struct list_head list;
96 struct ieee80211_channel chan;
99 /* We keep a static world regulatory domain in case of the absence of CRDA */
100 static const struct ieee80211_regdomain world_regdom = {
104 /* IEEE 802.11b/g, channels 1..11 */
105 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
106 /* IEEE 802.11b/g, channels 12..13. No HT40
107 * channel fits here. */
108 REG_RULE(2467-10, 2472+10, 20, 6, 20,
109 NL80211_RRF_PASSIVE_SCAN |
110 NL80211_RRF_NO_IBSS),
111 /* IEEE 802.11 channel 14 - Only JP enables
112 * this and for 802.11b only */
113 REG_RULE(2484-10, 2484+10, 20, 6, 20,
114 NL80211_RRF_PASSIVE_SCAN |
115 NL80211_RRF_NO_IBSS |
116 NL80211_RRF_NO_OFDM),
117 /* IEEE 802.11a, channel 36..48 */
118 REG_RULE(5180-10, 5240+10, 40, 6, 20,
119 NL80211_RRF_PASSIVE_SCAN |
120 NL80211_RRF_NO_IBSS),
122 /* NB: 5260 MHz - 5700 MHz requies DFS */
124 /* IEEE 802.11a, channel 149..165 */
125 REG_RULE(5745-10, 5825+10, 40, 6, 20,
126 NL80211_RRF_PASSIVE_SCAN |
127 NL80211_RRF_NO_IBSS),
131 static const struct ieee80211_regdomain *cfg80211_world_regdom =
134 static char *ieee80211_regdom = "00";
135 static char user_alpha2[2];
137 module_param(ieee80211_regdom, charp, 0444);
138 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
140 static void reset_regdomains(void)
142 /* avoid freeing static information or freeing something twice */
143 if (cfg80211_regdomain == cfg80211_world_regdom)
144 cfg80211_regdomain = NULL;
145 if (cfg80211_world_regdom == &world_regdom)
146 cfg80211_world_regdom = NULL;
147 if (cfg80211_regdomain == &world_regdom)
148 cfg80211_regdomain = NULL;
150 kfree(cfg80211_regdomain);
151 kfree(cfg80211_world_regdom);
153 cfg80211_world_regdom = &world_regdom;
154 cfg80211_regdomain = NULL;
158 * Dynamic world regulatory domain requested by the wireless
159 * core upon initialization
161 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
163 BUG_ON(!last_request);
167 cfg80211_world_regdom = rd;
168 cfg80211_regdomain = rd;
171 bool is_world_regdom(const char *alpha2)
175 if (alpha2[0] == '0' && alpha2[1] == '0')
180 static bool is_alpha2_set(const char *alpha2)
184 if (alpha2[0] != 0 && alpha2[1] != 0)
189 static bool is_unknown_alpha2(const char *alpha2)
194 * Special case where regulatory domain was built by driver
195 * but a specific alpha2 cannot be determined
197 if (alpha2[0] == '9' && alpha2[1] == '9')
202 static bool is_intersected_alpha2(const char *alpha2)
207 * Special case where regulatory domain is the
208 * result of an intersection between two regulatory domain
211 if (alpha2[0] == '9' && alpha2[1] == '8')
216 static bool is_an_alpha2(const char *alpha2)
220 if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
225 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
227 if (!alpha2_x || !alpha2_y)
229 if (alpha2_x[0] == alpha2_y[0] &&
230 alpha2_x[1] == alpha2_y[1])
235 static bool regdom_changes(const char *alpha2)
237 assert_cfg80211_lock();
239 if (!cfg80211_regdomain)
241 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
247 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
248 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
249 * has ever been issued.
251 static bool is_user_regdom_saved(void)
253 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
256 /* This would indicate a mistake on the design */
257 if (WARN((!is_world_regdom(user_alpha2) &&
258 !is_an_alpha2(user_alpha2)),
259 "Unexpected user alpha2: %c%c\n",
267 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
268 const struct ieee80211_regdomain *src_regd)
270 struct ieee80211_regdomain *regd;
271 int size_of_regd = 0;
274 size_of_regd = sizeof(struct ieee80211_regdomain) +
275 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
277 regd = kzalloc(size_of_regd, GFP_KERNEL);
281 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
283 for (i = 0; i < src_regd->n_reg_rules; i++)
284 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
285 sizeof(struct ieee80211_reg_rule));
291 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
292 struct reg_regdb_search_request {
294 struct list_head list;
297 static LIST_HEAD(reg_regdb_search_list);
298 static DEFINE_MUTEX(reg_regdb_search_mutex);
300 static void reg_regdb_search(struct work_struct *work)
302 struct reg_regdb_search_request *request;
303 const struct ieee80211_regdomain *curdom, *regdom;
306 mutex_lock(®_regdb_search_mutex);
307 while (!list_empty(®_regdb_search_list)) {
308 request = list_first_entry(®_regdb_search_list,
309 struct reg_regdb_search_request,
311 list_del(&request->list);
313 for (i=0; i<reg_regdb_size; i++) {
314 curdom = reg_regdb[i];
316 if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
317 r = reg_copy_regd(®dom, curdom);
320 mutex_lock(&cfg80211_mutex);
322 mutex_unlock(&cfg80211_mutex);
329 mutex_unlock(®_regdb_search_mutex);
332 static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
334 static void reg_regdb_query(const char *alpha2)
336 struct reg_regdb_search_request *request;
341 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
345 memcpy(request->alpha2, alpha2, 2);
347 mutex_lock(®_regdb_search_mutex);
348 list_add_tail(&request->list, ®_regdb_search_list);
349 mutex_unlock(®_regdb_search_mutex);
351 schedule_work(®_regdb_work);
354 static inline void reg_regdb_query(const char *alpha2) {}
355 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
358 * This lets us keep regulatory code which is updated on a regulatory
359 * basis in userspace.
361 static int call_crda(const char *alpha2)
363 char country_env[9 + 2] = "COUNTRY=";
369 if (!is_world_regdom((char *) alpha2))
370 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
371 alpha2[0], alpha2[1]);
373 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
374 "regulatory domain\n");
376 /* query internal regulatory database (if it exists) */
377 reg_regdb_query(alpha2);
379 country_env[8] = alpha2[0];
380 country_env[9] = alpha2[1];
382 return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp);
385 /* Used by nl80211 before kmalloc'ing our regulatory domain */
386 bool reg_is_valid_request(const char *alpha2)
388 assert_cfg80211_lock();
393 return alpha2_equal(last_request->alpha2, alpha2);
396 /* Sanity check on a regulatory rule */
397 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
399 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
402 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
405 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
408 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
410 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
411 freq_range->max_bandwidth_khz > freq_diff)
417 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
419 const struct ieee80211_reg_rule *reg_rule = NULL;
422 if (!rd->n_reg_rules)
425 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
428 for (i = 0; i < rd->n_reg_rules; i++) {
429 reg_rule = &rd->reg_rules[i];
430 if (!is_valid_reg_rule(reg_rule))
437 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
441 u32 start_freq_khz, end_freq_khz;
443 start_freq_khz = center_freq_khz - (bw_khz/2);
444 end_freq_khz = center_freq_khz + (bw_khz/2);
446 if (start_freq_khz >= freq_range->start_freq_khz &&
447 end_freq_khz <= freq_range->end_freq_khz)
454 * freq_in_rule_band - tells us if a frequency is in a frequency band
455 * @freq_range: frequency rule we want to query
456 * @freq_khz: frequency we are inquiring about
458 * This lets us know if a specific frequency rule is or is not relevant to
459 * a specific frequency's band. Bands are device specific and artificial
460 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
461 * safe for now to assume that a frequency rule should not be part of a
462 * frequency's band if the start freq or end freq are off by more than 2 GHz.
463 * This resolution can be lowered and should be considered as we add
464 * regulatory rule support for other "bands".
466 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
469 #define ONE_GHZ_IN_KHZ 1000000
470 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
472 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
475 #undef ONE_GHZ_IN_KHZ
479 * Helper for regdom_intersect(), this does the real
480 * mathematical intersection fun
482 static int reg_rules_intersect(
483 const struct ieee80211_reg_rule *rule1,
484 const struct ieee80211_reg_rule *rule2,
485 struct ieee80211_reg_rule *intersected_rule)
487 const struct ieee80211_freq_range *freq_range1, *freq_range2;
488 struct ieee80211_freq_range *freq_range;
489 const struct ieee80211_power_rule *power_rule1, *power_rule2;
490 struct ieee80211_power_rule *power_rule;
493 freq_range1 = &rule1->freq_range;
494 freq_range2 = &rule2->freq_range;
495 freq_range = &intersected_rule->freq_range;
497 power_rule1 = &rule1->power_rule;
498 power_rule2 = &rule2->power_rule;
499 power_rule = &intersected_rule->power_rule;
501 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
502 freq_range2->start_freq_khz);
503 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
504 freq_range2->end_freq_khz);
505 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
506 freq_range2->max_bandwidth_khz);
508 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
509 if (freq_range->max_bandwidth_khz > freq_diff)
510 freq_range->max_bandwidth_khz = freq_diff;
512 power_rule->max_eirp = min(power_rule1->max_eirp,
513 power_rule2->max_eirp);
514 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
515 power_rule2->max_antenna_gain);
517 intersected_rule->flags = (rule1->flags | rule2->flags);
519 if (!is_valid_reg_rule(intersected_rule))
526 * regdom_intersect - do the intersection between two regulatory domains
527 * @rd1: first regulatory domain
528 * @rd2: second regulatory domain
530 * Use this function to get the intersection between two regulatory domains.
531 * Once completed we will mark the alpha2 for the rd as intersected, "98",
532 * as no one single alpha2 can represent this regulatory domain.
534 * Returns a pointer to the regulatory domain structure which will hold the
535 * resulting intersection of rules between rd1 and rd2. We will
536 * kzalloc() this structure for you.
538 static struct ieee80211_regdomain *regdom_intersect(
539 const struct ieee80211_regdomain *rd1,
540 const struct ieee80211_regdomain *rd2)
544 unsigned int num_rules = 0, rule_idx = 0;
545 const struct ieee80211_reg_rule *rule1, *rule2;
546 struct ieee80211_reg_rule *intersected_rule;
547 struct ieee80211_regdomain *rd;
548 /* This is just a dummy holder to help us count */
549 struct ieee80211_reg_rule irule;
551 /* Uses the stack temporarily for counter arithmetic */
552 intersected_rule = &irule;
554 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
560 * First we get a count of the rules we'll need, then we actually
561 * build them. This is to so we can malloc() and free() a
562 * regdomain once. The reason we use reg_rules_intersect() here
563 * is it will return -EINVAL if the rule computed makes no sense.
564 * All rules that do check out OK are valid.
567 for (x = 0; x < rd1->n_reg_rules; x++) {
568 rule1 = &rd1->reg_rules[x];
569 for (y = 0; y < rd2->n_reg_rules; y++) {
570 rule2 = &rd2->reg_rules[y];
571 if (!reg_rules_intersect(rule1, rule2,
574 memset(intersected_rule, 0,
575 sizeof(struct ieee80211_reg_rule));
582 size_of_regd = sizeof(struct ieee80211_regdomain) +
583 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
585 rd = kzalloc(size_of_regd, GFP_KERNEL);
589 for (x = 0; x < rd1->n_reg_rules; x++) {
590 rule1 = &rd1->reg_rules[x];
591 for (y = 0; y < rd2->n_reg_rules; y++) {
592 rule2 = &rd2->reg_rules[y];
594 * This time around instead of using the stack lets
595 * write to the target rule directly saving ourselves
598 intersected_rule = &rd->reg_rules[rule_idx];
599 r = reg_rules_intersect(rule1, rule2,
602 * No need to memset here the intersected rule here as
603 * we're not using the stack anymore
611 if (rule_idx != num_rules) {
616 rd->n_reg_rules = num_rules;
624 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
625 * want to just have the channel structure use these
627 static u32 map_regdom_flags(u32 rd_flags)
629 u32 channel_flags = 0;
630 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
631 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
632 if (rd_flags & NL80211_RRF_NO_IBSS)
633 channel_flags |= IEEE80211_CHAN_NO_IBSS;
634 if (rd_flags & NL80211_RRF_DFS)
635 channel_flags |= IEEE80211_CHAN_RADAR;
636 return channel_flags;
639 static int freq_reg_info_regd(struct wiphy *wiphy,
642 const struct ieee80211_reg_rule **reg_rule,
643 const struct ieee80211_regdomain *custom_regd)
646 bool band_rule_found = false;
647 const struct ieee80211_regdomain *regd;
648 bool bw_fits = false;
651 desired_bw_khz = MHZ_TO_KHZ(20);
653 regd = custom_regd ? custom_regd : cfg80211_regdomain;
656 * Follow the driver's regulatory domain, if present, unless a country
657 * IE has been processed or a user wants to help complaince further
659 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
660 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
667 for (i = 0; i < regd->n_reg_rules; i++) {
668 const struct ieee80211_reg_rule *rr;
669 const struct ieee80211_freq_range *fr = NULL;
670 const struct ieee80211_power_rule *pr = NULL;
672 rr = ®d->reg_rules[i];
673 fr = &rr->freq_range;
674 pr = &rr->power_rule;
677 * We only need to know if one frequency rule was
678 * was in center_freq's band, that's enough, so lets
679 * not overwrite it once found
681 if (!band_rule_found)
682 band_rule_found = freq_in_rule_band(fr, center_freq);
684 bw_fits = reg_does_bw_fit(fr,
688 if (band_rule_found && bw_fits) {
694 if (!band_rule_found)
700 int freq_reg_info(struct wiphy *wiphy,
703 const struct ieee80211_reg_rule **reg_rule)
705 assert_cfg80211_lock();
706 return freq_reg_info_regd(wiphy,
712 EXPORT_SYMBOL(freq_reg_info);
714 #ifdef CONFIG_CFG80211_REG_DEBUG
715 static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
718 case NL80211_REGDOM_SET_BY_CORE:
719 return "Set by core";
720 case NL80211_REGDOM_SET_BY_USER:
721 return "Set by user";
722 case NL80211_REGDOM_SET_BY_DRIVER:
723 return "Set by driver";
724 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
725 return "Set by country IE";
732 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
734 const struct ieee80211_reg_rule *reg_rule)
736 const struct ieee80211_power_rule *power_rule;
737 const struct ieee80211_freq_range *freq_range;
738 char max_antenna_gain[32];
740 power_rule = ®_rule->power_rule;
741 freq_range = ®_rule->freq_range;
743 if (!power_rule->max_antenna_gain)
744 snprintf(max_antenna_gain, 32, "N/A");
746 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
748 REG_DBG_PRINT("Updating information on frequency %d MHz "
749 "for %d a MHz width channel with regulatory rule:\n",
751 KHZ_TO_MHZ(desired_bw_khz));
753 REG_DBG_PRINT("%d KHz - %d KHz @ KHz), (%s mBi, %d mBm)\n",
754 freq_range->start_freq_khz,
755 freq_range->end_freq_khz,
757 power_rule->max_eirp);
760 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
762 const struct ieee80211_reg_rule *reg_rule)
769 * Note that right now we assume the desired channel bandwidth
770 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
771 * per channel, the primary and the extension channel). To support
772 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
773 * new ieee80211_channel.target_bw and re run the regulatory check
774 * on the wiphy with the target_bw specified. Then we can simply use
775 * that below for the desired_bw_khz below.
777 static void handle_channel(struct wiphy *wiphy,
778 enum nl80211_reg_initiator initiator,
779 enum ieee80211_band band,
780 unsigned int chan_idx)
783 u32 flags, bw_flags = 0;
784 u32 desired_bw_khz = MHZ_TO_KHZ(20);
785 const struct ieee80211_reg_rule *reg_rule = NULL;
786 const struct ieee80211_power_rule *power_rule = NULL;
787 const struct ieee80211_freq_range *freq_range = NULL;
788 struct ieee80211_supported_band *sband;
789 struct ieee80211_channel *chan;
790 struct wiphy *request_wiphy = NULL;
792 assert_cfg80211_lock();
794 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
796 sband = wiphy->bands[band];
797 BUG_ON(chan_idx >= sband->n_channels);
798 chan = &sband->channels[chan_idx];
800 flags = chan->orig_flags;
802 r = freq_reg_info(wiphy,
803 MHZ_TO_KHZ(chan->center_freq),
809 * We will disable all channels that do not match our
810 * recieved regulatory rule unless the hint is coming
811 * from a Country IE and the Country IE had no information
812 * about a band. The IEEE 802.11 spec allows for an AP
813 * to send only a subset of the regulatory rules allowed,
814 * so an AP in the US that only supports 2.4 GHz may only send
815 * a country IE with information for the 2.4 GHz band
816 * while 5 GHz is still supported.
818 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
822 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
823 chan->flags = IEEE80211_CHAN_DISABLED;
827 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
829 power_rule = ®_rule->power_rule;
830 freq_range = ®_rule->freq_range;
832 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
833 bw_flags = IEEE80211_CHAN_NO_HT40;
835 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
836 request_wiphy && request_wiphy == wiphy &&
837 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
839 * This gaurantees the driver's requested regulatory domain
840 * will always be used as a base for further regulatory
843 chan->flags = chan->orig_flags =
844 map_regdom_flags(reg_rule->flags) | bw_flags;
845 chan->max_antenna_gain = chan->orig_mag =
846 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
847 chan->max_power = chan->orig_mpwr =
848 (int) MBM_TO_DBM(power_rule->max_eirp);
852 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
853 chan->max_antenna_gain = min(chan->orig_mag,
854 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
856 chan->max_power = min(chan->orig_mpwr,
857 (int) MBM_TO_DBM(power_rule->max_eirp));
859 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
862 static void handle_band(struct wiphy *wiphy,
863 enum ieee80211_band band,
864 enum nl80211_reg_initiator initiator)
867 struct ieee80211_supported_band *sband;
869 BUG_ON(!wiphy->bands[band]);
870 sband = wiphy->bands[band];
872 for (i = 0; i < sband->n_channels; i++)
873 handle_channel(wiphy, initiator, band, i);
876 static bool ignore_reg_update(struct wiphy *wiphy,
877 enum nl80211_reg_initiator initiator)
880 REG_DBG_PRINT("Ignoring regulatory request %s since "
881 "last_request is not set\n",
882 reg_initiator_name(initiator));
886 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
887 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
888 REG_DBG_PRINT("Ignoring regulatory request %s "
889 "since the driver uses its own custom "
890 "regulatory domain ",
891 reg_initiator_name(initiator));
896 * wiphy->regd will be set once the device has its own
897 * desired regulatory domain set
899 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
900 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
901 !is_world_regdom(last_request->alpha2)) {
902 REG_DBG_PRINT("Ignoring regulatory request %s "
903 "since the driver requires its own regulaotry "
904 "domain to be set first",
905 reg_initiator_name(initiator));
912 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
914 struct cfg80211_registered_device *rdev;
916 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
917 wiphy_update_regulatory(&rdev->wiphy, initiator);
920 static void handle_reg_beacon(struct wiphy *wiphy,
921 unsigned int chan_idx,
922 struct reg_beacon *reg_beacon)
924 struct ieee80211_supported_band *sband;
925 struct ieee80211_channel *chan;
926 bool channel_changed = false;
927 struct ieee80211_channel chan_before;
929 assert_cfg80211_lock();
931 sband = wiphy->bands[reg_beacon->chan.band];
932 chan = &sband->channels[chan_idx];
934 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
937 if (chan->beacon_found)
940 chan->beacon_found = true;
942 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
945 chan_before.center_freq = chan->center_freq;
946 chan_before.flags = chan->flags;
948 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
949 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
950 channel_changed = true;
953 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
954 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
955 channel_changed = true;
959 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
963 * Called when a scan on a wiphy finds a beacon on
966 static void wiphy_update_new_beacon(struct wiphy *wiphy,
967 struct reg_beacon *reg_beacon)
970 struct ieee80211_supported_band *sband;
972 assert_cfg80211_lock();
974 if (!wiphy->bands[reg_beacon->chan.band])
977 sband = wiphy->bands[reg_beacon->chan.band];
979 for (i = 0; i < sband->n_channels; i++)
980 handle_reg_beacon(wiphy, i, reg_beacon);
984 * Called upon reg changes or a new wiphy is added
986 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
989 struct ieee80211_supported_band *sband;
990 struct reg_beacon *reg_beacon;
992 assert_cfg80211_lock();
994 if (list_empty(®_beacon_list))
997 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
998 if (!wiphy->bands[reg_beacon->chan.band])
1000 sband = wiphy->bands[reg_beacon->chan.band];
1001 for (i = 0; i < sband->n_channels; i++)
1002 handle_reg_beacon(wiphy, i, reg_beacon);
1006 static bool reg_is_world_roaming(struct wiphy *wiphy)
1008 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1009 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1012 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1013 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1018 /* Reap the advantages of previously found beacons */
1019 static void reg_process_beacons(struct wiphy *wiphy)
1022 * Means we are just firing up cfg80211, so no beacons would
1023 * have been processed yet.
1027 if (!reg_is_world_roaming(wiphy))
1029 wiphy_update_beacon_reg(wiphy);
1032 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1036 if (chan->flags & IEEE80211_CHAN_DISABLED)
1038 /* This would happen when regulatory rules disallow HT40 completely */
1039 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1044 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1045 enum ieee80211_band band,
1046 unsigned int chan_idx)
1048 struct ieee80211_supported_band *sband;
1049 struct ieee80211_channel *channel;
1050 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1053 assert_cfg80211_lock();
1055 sband = wiphy->bands[band];
1056 BUG_ON(chan_idx >= sband->n_channels);
1057 channel = &sband->channels[chan_idx];
1059 if (is_ht40_not_allowed(channel)) {
1060 channel->flags |= IEEE80211_CHAN_NO_HT40;
1065 * We need to ensure the extension channels exist to
1066 * be able to use HT40- or HT40+, this finds them (or not)
1068 for (i = 0; i < sband->n_channels; i++) {
1069 struct ieee80211_channel *c = &sband->channels[i];
1070 if (c->center_freq == (channel->center_freq - 20))
1072 if (c->center_freq == (channel->center_freq + 20))
1077 * Please note that this assumes target bandwidth is 20 MHz,
1078 * if that ever changes we also need to change the below logic
1079 * to include that as well.
1081 if (is_ht40_not_allowed(channel_before))
1082 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1084 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1086 if (is_ht40_not_allowed(channel_after))
1087 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1089 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1092 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1093 enum ieee80211_band band)
1096 struct ieee80211_supported_band *sband;
1098 BUG_ON(!wiphy->bands[band]);
1099 sband = wiphy->bands[band];
1101 for (i = 0; i < sband->n_channels; i++)
1102 reg_process_ht_flags_channel(wiphy, band, i);
1105 static void reg_process_ht_flags(struct wiphy *wiphy)
1107 enum ieee80211_band band;
1112 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1113 if (wiphy->bands[band])
1114 reg_process_ht_flags_band(wiphy, band);
1119 void wiphy_update_regulatory(struct wiphy *wiphy,
1120 enum nl80211_reg_initiator initiator)
1122 enum ieee80211_band band;
1124 if (ignore_reg_update(wiphy, initiator))
1126 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1127 if (wiphy->bands[band])
1128 handle_band(wiphy, band, initiator);
1131 reg_process_beacons(wiphy);
1132 reg_process_ht_flags(wiphy);
1133 if (wiphy->reg_notifier)
1134 wiphy->reg_notifier(wiphy, last_request);
1137 static void handle_channel_custom(struct wiphy *wiphy,
1138 enum ieee80211_band band,
1139 unsigned int chan_idx,
1140 const struct ieee80211_regdomain *regd)
1143 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1145 const struct ieee80211_reg_rule *reg_rule = NULL;
1146 const struct ieee80211_power_rule *power_rule = NULL;
1147 const struct ieee80211_freq_range *freq_range = NULL;
1148 struct ieee80211_supported_band *sband;
1149 struct ieee80211_channel *chan;
1153 sband = wiphy->bands[band];
1154 BUG_ON(chan_idx >= sband->n_channels);
1155 chan = &sband->channels[chan_idx];
1157 r = freq_reg_info_regd(wiphy,
1158 MHZ_TO_KHZ(chan->center_freq),
1164 REG_DBG_PRINT("Disabling freq %d MHz as custom "
1165 "regd has no rule that fits a %d MHz "
1168 KHZ_TO_MHZ(desired_bw_khz));
1169 chan->flags = IEEE80211_CHAN_DISABLED;
1173 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1175 power_rule = ®_rule->power_rule;
1176 freq_range = ®_rule->freq_range;
1178 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1179 bw_flags = IEEE80211_CHAN_NO_HT40;
1181 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1182 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1183 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1186 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1187 const struct ieee80211_regdomain *regd)
1190 struct ieee80211_supported_band *sband;
1192 BUG_ON(!wiphy->bands[band]);
1193 sband = wiphy->bands[band];
1195 for (i = 0; i < sband->n_channels; i++)
1196 handle_channel_custom(wiphy, band, i, regd);
1199 /* Used by drivers prior to wiphy registration */
1200 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1201 const struct ieee80211_regdomain *regd)
1203 enum ieee80211_band band;
1204 unsigned int bands_set = 0;
1206 mutex_lock(®_mutex);
1207 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1208 if (!wiphy->bands[band])
1210 handle_band_custom(wiphy, band, regd);
1213 mutex_unlock(®_mutex);
1216 * no point in calling this if it won't have any effect
1217 * on your device's supportd bands.
1219 WARN_ON(!bands_set);
1221 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1224 * Return value which can be used by ignore_request() to indicate
1225 * it has been determined we should intersect two regulatory domains
1227 #define REG_INTERSECT 1
1229 /* This has the logic which determines when a new request
1230 * should be ignored. */
1231 static int ignore_request(struct wiphy *wiphy,
1232 struct regulatory_request *pending_request)
1234 struct wiphy *last_wiphy = NULL;
1236 assert_cfg80211_lock();
1238 /* All initial requests are respected */
1242 switch (pending_request->initiator) {
1243 case NL80211_REGDOM_SET_BY_CORE:
1245 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1247 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1249 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1251 if (last_request->initiator ==
1252 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1253 if (last_wiphy != wiphy) {
1255 * Two cards with two APs claiming different
1256 * Country IE alpha2s. We could
1257 * intersect them, but that seems unlikely
1258 * to be correct. Reject second one for now.
1260 if (regdom_changes(pending_request->alpha2))
1265 * Two consecutive Country IE hints on the same wiphy.
1266 * This should be picked up early by the driver/stack
1268 if (WARN_ON(regdom_changes(pending_request->alpha2)))
1273 case NL80211_REGDOM_SET_BY_DRIVER:
1274 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1275 if (regdom_changes(pending_request->alpha2))
1281 * This would happen if you unplug and plug your card
1282 * back in or if you add a new device for which the previously
1283 * loaded card also agrees on the regulatory domain.
1285 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1286 !regdom_changes(pending_request->alpha2))
1289 return REG_INTERSECT;
1290 case NL80211_REGDOM_SET_BY_USER:
1291 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1292 return REG_INTERSECT;
1294 * If the user knows better the user should set the regdom
1295 * to their country before the IE is picked up
1297 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1298 last_request->intersect)
1301 * Process user requests only after previous user/driver/core
1302 * requests have been processed
1304 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1305 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1306 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1307 if (regdom_changes(last_request->alpha2))
1311 if (!regdom_changes(pending_request->alpha2))
1321 * __regulatory_hint - hint to the wireless core a regulatory domain
1322 * @wiphy: if the hint comes from country information from an AP, this
1323 * is required to be set to the wiphy that received the information
1324 * @pending_request: the regulatory request currently being processed
1326 * The Wireless subsystem can use this function to hint to the wireless core
1327 * what it believes should be the current regulatory domain.
1329 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1330 * already been set or other standard error codes.
1332 * Caller must hold &cfg80211_mutex and ®_mutex
1334 static int __regulatory_hint(struct wiphy *wiphy,
1335 struct regulatory_request *pending_request)
1337 bool intersect = false;
1340 assert_cfg80211_lock();
1342 r = ignore_request(wiphy, pending_request);
1344 if (r == REG_INTERSECT) {
1345 if (pending_request->initiator ==
1346 NL80211_REGDOM_SET_BY_DRIVER) {
1347 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1349 kfree(pending_request);
1356 * If the regulatory domain being requested by the
1357 * driver has already been set just copy it to the
1360 if (r == -EALREADY &&
1361 pending_request->initiator ==
1362 NL80211_REGDOM_SET_BY_DRIVER) {
1363 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1365 kfree(pending_request);
1371 kfree(pending_request);
1376 kfree(last_request);
1378 last_request = pending_request;
1379 last_request->intersect = intersect;
1381 pending_request = NULL;
1383 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1384 user_alpha2[0] = last_request->alpha2[0];
1385 user_alpha2[1] = last_request->alpha2[1];
1388 /* When r == REG_INTERSECT we do need to call CRDA */
1391 * Since CRDA will not be called in this case as we already
1392 * have applied the requested regulatory domain before we just
1393 * inform userspace we have processed the request
1396 nl80211_send_reg_change_event(last_request);
1400 return call_crda(last_request->alpha2);
1403 /* This processes *all* regulatory hints */
1404 static void reg_process_hint(struct regulatory_request *reg_request)
1407 struct wiphy *wiphy = NULL;
1408 enum nl80211_reg_initiator initiator = reg_request->initiator;
1410 BUG_ON(!reg_request->alpha2);
1412 mutex_lock(&cfg80211_mutex);
1413 mutex_lock(®_mutex);
1415 if (wiphy_idx_valid(reg_request->wiphy_idx))
1416 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1418 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1424 r = __regulatory_hint(wiphy, reg_request);
1425 /* This is required so that the orig_* parameters are saved */
1426 if (r == -EALREADY && wiphy &&
1427 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
1428 wiphy_update_regulatory(wiphy, initiator);
1430 mutex_unlock(®_mutex);
1431 mutex_unlock(&cfg80211_mutex);
1434 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
1435 static void reg_process_pending_hints(void)
1437 struct regulatory_request *reg_request;
1439 spin_lock(®_requests_lock);
1440 while (!list_empty(®_requests_list)) {
1441 reg_request = list_first_entry(®_requests_list,
1442 struct regulatory_request,
1444 list_del_init(®_request->list);
1446 spin_unlock(®_requests_lock);
1447 reg_process_hint(reg_request);
1448 spin_lock(®_requests_lock);
1450 spin_unlock(®_requests_lock);
1453 /* Processes beacon hints -- this has nothing to do with country IEs */
1454 static void reg_process_pending_beacon_hints(void)
1456 struct cfg80211_registered_device *rdev;
1457 struct reg_beacon *pending_beacon, *tmp;
1460 * No need to hold the reg_mutex here as we just touch wiphys
1461 * and do not read or access regulatory variables.
1463 mutex_lock(&cfg80211_mutex);
1465 /* This goes through the _pending_ beacon list */
1466 spin_lock_bh(®_pending_beacons_lock);
1468 if (list_empty(®_pending_beacons)) {
1469 spin_unlock_bh(®_pending_beacons_lock);
1473 list_for_each_entry_safe(pending_beacon, tmp,
1474 ®_pending_beacons, list) {
1476 list_del_init(&pending_beacon->list);
1478 /* Applies the beacon hint to current wiphys */
1479 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1480 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1482 /* Remembers the beacon hint for new wiphys or reg changes */
1483 list_add_tail(&pending_beacon->list, ®_beacon_list);
1486 spin_unlock_bh(®_pending_beacons_lock);
1488 mutex_unlock(&cfg80211_mutex);
1491 static void reg_todo(struct work_struct *work)
1493 reg_process_pending_hints();
1494 reg_process_pending_beacon_hints();
1497 static DECLARE_WORK(reg_work, reg_todo);
1499 static void queue_regulatory_request(struct regulatory_request *request)
1501 if (isalpha(request->alpha2[0]))
1502 request->alpha2[0] = toupper(request->alpha2[0]);
1503 if (isalpha(request->alpha2[1]))
1504 request->alpha2[1] = toupper(request->alpha2[1]);
1506 spin_lock(®_requests_lock);
1507 list_add_tail(&request->list, ®_requests_list);
1508 spin_unlock(®_requests_lock);
1510 schedule_work(®_work);
1514 * Core regulatory hint -- happens during cfg80211_init()
1515 * and when we restore regulatory settings.
1517 static int regulatory_hint_core(const char *alpha2)
1519 struct regulatory_request *request;
1521 kfree(last_request);
1522 last_request = NULL;
1524 request = kzalloc(sizeof(struct regulatory_request),
1529 request->alpha2[0] = alpha2[0];
1530 request->alpha2[1] = alpha2[1];
1531 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1533 queue_regulatory_request(request);
1539 int regulatory_hint_user(const char *alpha2)
1541 struct regulatory_request *request;
1545 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1549 request->wiphy_idx = WIPHY_IDX_STALE;
1550 request->alpha2[0] = alpha2[0];
1551 request->alpha2[1] = alpha2[1];
1552 request->initiator = NL80211_REGDOM_SET_BY_USER;
1554 queue_regulatory_request(request);
1560 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1562 struct regulatory_request *request;
1567 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1571 request->wiphy_idx = get_wiphy_idx(wiphy);
1573 /* Must have registered wiphy first */
1574 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1576 request->alpha2[0] = alpha2[0];
1577 request->alpha2[1] = alpha2[1];
1578 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1580 queue_regulatory_request(request);
1584 EXPORT_SYMBOL(regulatory_hint);
1587 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1588 * therefore cannot iterate over the rdev list here.
1590 void regulatory_hint_11d(struct wiphy *wiphy,
1591 enum ieee80211_band band,
1596 enum environment_cap env = ENVIRON_ANY;
1597 struct regulatory_request *request;
1599 mutex_lock(®_mutex);
1601 if (unlikely(!last_request))
1604 /* IE len must be evenly divisible by 2 */
1605 if (country_ie_len & 0x01)
1608 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1611 alpha2[0] = country_ie[0];
1612 alpha2[1] = country_ie[1];
1614 if (country_ie[2] == 'I')
1615 env = ENVIRON_INDOOR;
1616 else if (country_ie[2] == 'O')
1617 env = ENVIRON_OUTDOOR;
1620 * We will run this only upon a successful connection on cfg80211.
1621 * We leave conflict resolution to the workqueue, where can hold
1624 if (likely(last_request->initiator ==
1625 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1626 wiphy_idx_valid(last_request->wiphy_idx)))
1629 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1633 request->wiphy_idx = get_wiphy_idx(wiphy);
1634 request->alpha2[0] = alpha2[0];
1635 request->alpha2[1] = alpha2[1];
1636 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1637 request->country_ie_env = env;
1639 mutex_unlock(®_mutex);
1641 queue_regulatory_request(request);
1646 mutex_unlock(®_mutex);
1649 static void restore_alpha2(char *alpha2, bool reset_user)
1651 /* indicates there is no alpha2 to consider for restoration */
1655 /* The user setting has precedence over the module parameter */
1656 if (is_user_regdom_saved()) {
1657 /* Unless we're asked to ignore it and reset it */
1659 REG_DBG_PRINT("Restoring regulatory settings "
1660 "including user preference\n");
1661 user_alpha2[0] = '9';
1662 user_alpha2[1] = '7';
1665 * If we're ignoring user settings, we still need to
1666 * check the module parameter to ensure we put things
1667 * back as they were for a full restore.
1669 if (!is_world_regdom(ieee80211_regdom)) {
1670 REG_DBG_PRINT("Keeping preference on "
1671 "module parameter ieee80211_regdom: %c%c\n",
1672 ieee80211_regdom[0],
1673 ieee80211_regdom[1]);
1674 alpha2[0] = ieee80211_regdom[0];
1675 alpha2[1] = ieee80211_regdom[1];
1678 REG_DBG_PRINT("Restoring regulatory settings "
1679 "while preserving user preference for: %c%c\n",
1682 alpha2[0] = user_alpha2[0];
1683 alpha2[1] = user_alpha2[1];
1685 } else if (!is_world_regdom(ieee80211_regdom)) {
1686 REG_DBG_PRINT("Keeping preference on "
1687 "module parameter ieee80211_regdom: %c%c\n",
1688 ieee80211_regdom[0],
1689 ieee80211_regdom[1]);
1690 alpha2[0] = ieee80211_regdom[0];
1691 alpha2[1] = ieee80211_regdom[1];
1693 REG_DBG_PRINT("Restoring regulatory settings\n");
1697 * Restoring regulatory settings involves ingoring any
1698 * possibly stale country IE information and user regulatory
1699 * settings if so desired, this includes any beacon hints
1700 * learned as we could have traveled outside to another country
1701 * after disconnection. To restore regulatory settings we do
1702 * exactly what we did at bootup:
1704 * - send a core regulatory hint
1705 * - send a user regulatory hint if applicable
1707 * Device drivers that send a regulatory hint for a specific country
1708 * keep their own regulatory domain on wiphy->regd so that does does
1709 * not need to be remembered.
1711 static void restore_regulatory_settings(bool reset_user)
1714 struct reg_beacon *reg_beacon, *btmp;
1716 mutex_lock(&cfg80211_mutex);
1717 mutex_lock(®_mutex);
1720 restore_alpha2(alpha2, reset_user);
1722 /* Clear beacon hints */
1723 spin_lock_bh(®_pending_beacons_lock);
1724 if (!list_empty(®_pending_beacons)) {
1725 list_for_each_entry_safe(reg_beacon, btmp,
1726 ®_pending_beacons, list) {
1727 list_del(®_beacon->list);
1731 spin_unlock_bh(®_pending_beacons_lock);
1733 if (!list_empty(®_beacon_list)) {
1734 list_for_each_entry_safe(reg_beacon, btmp,
1735 ®_beacon_list, list) {
1736 list_del(®_beacon->list);
1741 /* First restore to the basic regulatory settings */
1742 cfg80211_regdomain = cfg80211_world_regdom;
1744 mutex_unlock(®_mutex);
1745 mutex_unlock(&cfg80211_mutex);
1747 regulatory_hint_core(cfg80211_regdomain->alpha2);
1750 * This restores the ieee80211_regdom module parameter
1751 * preference or the last user requested regulatory
1752 * settings, user regulatory settings takes precedence.
1754 if (is_an_alpha2(alpha2))
1755 regulatory_hint_user(user_alpha2);
1759 void regulatory_hint_disconnect(void)
1761 REG_DBG_PRINT("All devices are disconnected, going to "
1762 "restore regulatory settings\n");
1763 restore_regulatory_settings(false);
1766 static bool freq_is_chan_12_13_14(u16 freq)
1768 if (freq == ieee80211_channel_to_frequency(12) ||
1769 freq == ieee80211_channel_to_frequency(13) ||
1770 freq == ieee80211_channel_to_frequency(14))
1775 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1776 struct ieee80211_channel *beacon_chan,
1779 struct reg_beacon *reg_beacon;
1781 if (likely((beacon_chan->beacon_found ||
1782 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1783 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1784 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1787 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1791 REG_DBG_PRINT("Found new beacon on "
1792 "frequency: %d MHz (Ch %d) on %s\n",
1793 beacon_chan->center_freq,
1794 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1797 memcpy(®_beacon->chan, beacon_chan,
1798 sizeof(struct ieee80211_channel));
1802 * Since we can be called from BH or and non-BH context
1803 * we must use spin_lock_bh()
1805 spin_lock_bh(®_pending_beacons_lock);
1806 list_add_tail(®_beacon->list, ®_pending_beacons);
1807 spin_unlock_bh(®_pending_beacons_lock);
1809 schedule_work(®_work);
1814 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1817 const struct ieee80211_reg_rule *reg_rule = NULL;
1818 const struct ieee80211_freq_range *freq_range = NULL;
1819 const struct ieee80211_power_rule *power_rule = NULL;
1821 printk(KERN_INFO " (start_freq - end_freq @ bandwidth), "
1822 "(max_antenna_gain, max_eirp)\n");
1824 for (i = 0; i < rd->n_reg_rules; i++) {
1825 reg_rule = &rd->reg_rules[i];
1826 freq_range = ®_rule->freq_range;
1827 power_rule = ®_rule->power_rule;
1830 * There may not be documentation for max antenna gain
1831 * in certain regions
1833 if (power_rule->max_antenna_gain)
1834 printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), "
1835 "(%d mBi, %d mBm)\n",
1836 freq_range->start_freq_khz,
1837 freq_range->end_freq_khz,
1838 freq_range->max_bandwidth_khz,
1839 power_rule->max_antenna_gain,
1840 power_rule->max_eirp);
1842 printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), "
1844 freq_range->start_freq_khz,
1845 freq_range->end_freq_khz,
1846 freq_range->max_bandwidth_khz,
1847 power_rule->max_eirp);
1851 static void print_regdomain(const struct ieee80211_regdomain *rd)
1854 if (is_intersected_alpha2(rd->alpha2)) {
1856 if (last_request->initiator ==
1857 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1858 struct cfg80211_registered_device *rdev;
1859 rdev = cfg80211_rdev_by_wiphy_idx(
1860 last_request->wiphy_idx);
1862 printk(KERN_INFO "cfg80211: Current regulatory "
1863 "domain updated by AP to: %c%c\n",
1864 rdev->country_ie_alpha2[0],
1865 rdev->country_ie_alpha2[1]);
1867 printk(KERN_INFO "cfg80211: Current regulatory "
1868 "domain intersected:\n");
1870 printk(KERN_INFO "cfg80211: Current regulatory "
1871 "domain intersected:\n");
1872 } else if (is_world_regdom(rd->alpha2))
1873 printk(KERN_INFO "cfg80211: World regulatory "
1874 "domain updated:\n");
1876 if (is_unknown_alpha2(rd->alpha2))
1877 printk(KERN_INFO "cfg80211: Regulatory domain "
1878 "changed to driver built-in settings "
1879 "(unknown country)\n");
1881 printk(KERN_INFO "cfg80211: Regulatory domain "
1882 "changed to country: %c%c\n",
1883 rd->alpha2[0], rd->alpha2[1]);
1888 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1890 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1891 rd->alpha2[0], rd->alpha2[1]);
1895 /* Takes ownership of rd only if it doesn't fail */
1896 static int __set_regdom(const struct ieee80211_regdomain *rd)
1898 const struct ieee80211_regdomain *intersected_rd = NULL;
1899 struct cfg80211_registered_device *rdev = NULL;
1900 struct wiphy *request_wiphy;
1901 /* Some basic sanity checks first */
1903 if (is_world_regdom(rd->alpha2)) {
1904 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1906 update_world_regdomain(rd);
1910 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1911 !is_unknown_alpha2(rd->alpha2))
1918 * Lets only bother proceeding on the same alpha2 if the current
1919 * rd is non static (it means CRDA was present and was used last)
1920 * and the pending request came in from a country IE
1922 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1924 * If someone else asked us to change the rd lets only bother
1925 * checking if the alpha2 changes if CRDA was already called
1927 if (!regdom_changes(rd->alpha2))
1932 * Now lets set the regulatory domain, update all driver channels
1933 * and finally inform them of what we have done, in case they want
1934 * to review or adjust their own settings based on their own
1935 * internal EEPROM data
1938 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1941 if (!is_valid_rd(rd)) {
1942 printk(KERN_ERR "cfg80211: Invalid "
1943 "regulatory domain detected:\n");
1944 print_regdomain_info(rd);
1948 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1950 if (!last_request->intersect) {
1953 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
1955 cfg80211_regdomain = rd;
1960 * For a driver hint, lets copy the regulatory domain the
1961 * driver wanted to the wiphy to deal with conflicts
1965 * Userspace could have sent two replies with only
1966 * one kernel request.
1968 if (request_wiphy->regd)
1971 r = reg_copy_regd(&request_wiphy->regd, rd);
1976 cfg80211_regdomain = rd;
1980 /* Intersection requires a bit more work */
1982 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1984 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1985 if (!intersected_rd)
1989 * We can trash what CRDA provided now.
1990 * However if a driver requested this specific regulatory
1991 * domain we keep it for its private use
1993 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
1994 request_wiphy->regd = rd;
2001 cfg80211_regdomain = intersected_rd;
2006 if (!intersected_rd)
2009 rdev = wiphy_to_dev(request_wiphy);
2011 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2012 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2013 rdev->env = last_request->country_ie_env;
2015 BUG_ON(intersected_rd == rd);
2021 cfg80211_regdomain = intersected_rd;
2028 * Use this call to set the current regulatory domain. Conflicts with
2029 * multiple drivers can be ironed out later. Caller must've already
2030 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2032 int set_regdom(const struct ieee80211_regdomain *rd)
2036 assert_cfg80211_lock();
2038 mutex_lock(®_mutex);
2040 /* Note that this doesn't update the wiphys, this is done below */
2041 r = __set_regdom(rd);
2044 mutex_unlock(®_mutex);
2048 /* This would make this whole thing pointless */
2049 if (!last_request->intersect)
2050 BUG_ON(rd != cfg80211_regdomain);
2052 /* update all wiphys now with the new established regulatory domain */
2053 update_all_wiphy_regulatory(last_request->initiator);
2055 print_regdomain(cfg80211_regdomain);
2057 nl80211_send_reg_change_event(last_request);
2059 mutex_unlock(®_mutex);
2064 /* Caller must hold cfg80211_mutex */
2065 void reg_device_remove(struct wiphy *wiphy)
2067 struct wiphy *request_wiphy = NULL;
2069 assert_cfg80211_lock();
2071 mutex_lock(®_mutex);
2076 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2078 if (!request_wiphy || request_wiphy != wiphy)
2081 last_request->wiphy_idx = WIPHY_IDX_STALE;
2082 last_request->country_ie_env = ENVIRON_ANY;
2084 mutex_unlock(®_mutex);
2087 int __init regulatory_init(void)
2091 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2092 if (IS_ERR(reg_pdev))
2093 return PTR_ERR(reg_pdev);
2095 spin_lock_init(®_requests_lock);
2096 spin_lock_init(®_pending_beacons_lock);
2098 cfg80211_regdomain = cfg80211_world_regdom;
2100 user_alpha2[0] = '9';
2101 user_alpha2[1] = '7';
2103 /* We always try to get an update for the static regdomain */
2104 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2109 * N.B. kobject_uevent_env() can fail mainly for when we're out
2110 * memory which is handled and propagated appropriately above
2111 * but it can also fail during a netlink_broadcast() or during
2112 * early boot for call_usermodehelper(). For now treat these
2113 * errors as non-fatal.
2115 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
2116 "to call CRDA during init");
2117 #ifdef CONFIG_CFG80211_REG_DEBUG
2118 /* We want to find out exactly why when debugging */
2124 * Finally, if the user set the module parameter treat it
2127 if (!is_world_regdom(ieee80211_regdom))
2128 regulatory_hint_user(ieee80211_regdom);
2133 void /* __init_or_exit */ regulatory_exit(void)
2135 struct regulatory_request *reg_request, *tmp;
2136 struct reg_beacon *reg_beacon, *btmp;
2138 cancel_work_sync(®_work);
2140 mutex_lock(&cfg80211_mutex);
2141 mutex_lock(®_mutex);
2145 kfree(last_request);
2147 platform_device_unregister(reg_pdev);
2149 spin_lock_bh(®_pending_beacons_lock);
2150 if (!list_empty(®_pending_beacons)) {
2151 list_for_each_entry_safe(reg_beacon, btmp,
2152 ®_pending_beacons, list) {
2153 list_del(®_beacon->list);
2157 spin_unlock_bh(®_pending_beacons_lock);
2159 if (!list_empty(®_beacon_list)) {
2160 list_for_each_entry_safe(reg_beacon, btmp,
2161 ®_beacon_list, list) {
2162 list_del(®_beacon->list);
2167 spin_lock(®_requests_lock);
2168 if (!list_empty(®_requests_list)) {
2169 list_for_each_entry_safe(reg_request, tmp,
2170 ®_requests_list, list) {
2171 list_del(®_request->list);
2175 spin_unlock(®_requests_lock);
2177 mutex_unlock(®_mutex);
2178 mutex_unlock(&cfg80211_mutex);