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/list.h>
37 #include <linux/random.h>
38 #include <linux/nl80211.h>
39 #include <linux/platform_device.h>
40 #include <net/cfg80211.h>
45 /* Receipt of information from last regulatory request */
46 static struct regulatory_request *last_request;
48 /* To trigger userspace events */
49 static struct platform_device *reg_pdev;
52 * Central wireless core regulatory domains, we only need two,
53 * the current one and a world regulatory domain in case we have no
54 * information to give us an alpha2
56 const struct ieee80211_regdomain *cfg80211_regdomain;
59 * We use this as a place for the rd structure built from the
60 * last parsed country IE to rest until CRDA gets back to us with
61 * what it thinks should apply for the same country
63 static const struct ieee80211_regdomain *country_ie_regdomain;
65 /* Used to queue up regulatory hints */
66 static LIST_HEAD(reg_requests_list);
67 static spinlock_t reg_requests_lock;
69 /* Used to queue up beacon hints for review */
70 static LIST_HEAD(reg_pending_beacons);
71 static spinlock_t reg_pending_beacons_lock;
73 /* Used to keep track of processed beacon hints */
74 static LIST_HEAD(reg_beacon_list);
77 struct list_head list;
78 struct ieee80211_channel chan;
81 /* We keep a static world regulatory domain in case of the absence of CRDA */
82 static const struct ieee80211_regdomain world_regdom = {
86 /* IEEE 802.11b/g, channels 1..11 */
87 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
88 /* IEEE 802.11b/g, channels 12..13. No HT40
89 * channel fits here. */
90 REG_RULE(2467-10, 2472+10, 20, 6, 20,
91 NL80211_RRF_PASSIVE_SCAN |
93 /* IEEE 802.11 channel 14 - Only JP enables
94 * this and for 802.11b only */
95 REG_RULE(2484-10, 2484+10, 20, 6, 20,
96 NL80211_RRF_PASSIVE_SCAN |
99 /* IEEE 802.11a, channel 36..48 */
100 REG_RULE(5180-10, 5240+10, 40, 6, 20,
101 NL80211_RRF_PASSIVE_SCAN |
102 NL80211_RRF_NO_IBSS),
104 /* NB: 5260 MHz - 5700 MHz requies DFS */
106 /* IEEE 802.11a, channel 149..165 */
107 REG_RULE(5745-10, 5825+10, 40, 6, 20,
108 NL80211_RRF_PASSIVE_SCAN |
109 NL80211_RRF_NO_IBSS),
113 static const struct ieee80211_regdomain *cfg80211_world_regdom =
116 static char *ieee80211_regdom = "00";
118 module_param(ieee80211_regdom, charp, 0444);
119 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
121 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
123 * We assume 40 MHz bandwidth for the old regulatory work.
124 * We make emphasis we are using the exact same frequencies
128 static const struct ieee80211_regdomain us_regdom = {
132 /* IEEE 802.11b/g, channels 1..11 */
133 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
134 /* IEEE 802.11a, channel 36 */
135 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
136 /* IEEE 802.11a, channel 40 */
137 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
138 /* IEEE 802.11a, channel 44 */
139 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
140 /* IEEE 802.11a, channels 48..64 */
141 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
142 /* IEEE 802.11a, channels 149..165, outdoor */
143 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
147 static const struct ieee80211_regdomain jp_regdom = {
151 /* IEEE 802.11b/g, channels 1..14 */
152 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
153 /* IEEE 802.11a, channels 34..48 */
154 REG_RULE(5170-10, 5240+10, 40, 6, 20,
155 NL80211_RRF_PASSIVE_SCAN),
156 /* IEEE 802.11a, channels 52..64 */
157 REG_RULE(5260-10, 5320+10, 40, 6, 20,
158 NL80211_RRF_NO_IBSS |
163 static const struct ieee80211_regdomain eu_regdom = {
166 * This alpha2 is bogus, we leave it here just for stupid
167 * backward compatibility
171 /* IEEE 802.11b/g, channels 1..13 */
172 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
173 /* IEEE 802.11a, channel 36 */
174 REG_RULE(5180-10, 5180+10, 40, 6, 23,
175 NL80211_RRF_PASSIVE_SCAN),
176 /* IEEE 802.11a, channel 40 */
177 REG_RULE(5200-10, 5200+10, 40, 6, 23,
178 NL80211_RRF_PASSIVE_SCAN),
179 /* IEEE 802.11a, channel 44 */
180 REG_RULE(5220-10, 5220+10, 40, 6, 23,
181 NL80211_RRF_PASSIVE_SCAN),
182 /* IEEE 802.11a, channels 48..64 */
183 REG_RULE(5240-10, 5320+10, 40, 6, 20,
184 NL80211_RRF_NO_IBSS |
186 /* IEEE 802.11a, channels 100..140 */
187 REG_RULE(5500-10, 5700+10, 40, 6, 30,
188 NL80211_RRF_NO_IBSS |
193 static const struct ieee80211_regdomain *static_regdom(char *alpha2)
195 if (alpha2[0] == 'U' && alpha2[1] == 'S')
197 if (alpha2[0] == 'J' && alpha2[1] == 'P')
199 if (alpha2[0] == 'E' && alpha2[1] == 'U')
201 /* Default, as per the old rules */
205 static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
207 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
212 static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
218 static void reset_regdomains(void)
220 /* avoid freeing static information or freeing something twice */
221 if (cfg80211_regdomain == cfg80211_world_regdom)
222 cfg80211_regdomain = NULL;
223 if (cfg80211_world_regdom == &world_regdom)
224 cfg80211_world_regdom = NULL;
225 if (cfg80211_regdomain == &world_regdom)
226 cfg80211_regdomain = NULL;
227 if (is_old_static_regdom(cfg80211_regdomain))
228 cfg80211_regdomain = NULL;
230 kfree(cfg80211_regdomain);
231 kfree(cfg80211_world_regdom);
233 cfg80211_world_regdom = &world_regdom;
234 cfg80211_regdomain = NULL;
238 * Dynamic world regulatory domain requested by the wireless
239 * core upon initialization
241 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
243 BUG_ON(!last_request);
247 cfg80211_world_regdom = rd;
248 cfg80211_regdomain = rd;
251 bool is_world_regdom(const char *alpha2)
255 if (alpha2[0] == '0' && alpha2[1] == '0')
260 static bool is_alpha2_set(const char *alpha2)
264 if (alpha2[0] != 0 && alpha2[1] != 0)
269 static bool is_alpha_upper(char letter)
272 if (letter >= 65 && letter <= 90)
277 static bool is_unknown_alpha2(const char *alpha2)
282 * Special case where regulatory domain was built by driver
283 * but a specific alpha2 cannot be determined
285 if (alpha2[0] == '9' && alpha2[1] == '9')
290 static bool is_intersected_alpha2(const char *alpha2)
295 * Special case where regulatory domain is the
296 * result of an intersection between two regulatory domain
299 if (alpha2[0] == '9' && alpha2[1] == '8')
304 static bool is_an_alpha2(const char *alpha2)
308 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
313 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
315 if (!alpha2_x || !alpha2_y)
317 if (alpha2_x[0] == alpha2_y[0] &&
318 alpha2_x[1] == alpha2_y[1])
323 static bool regdom_changes(const char *alpha2)
325 assert_cfg80211_lock();
327 if (!cfg80211_regdomain)
329 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
335 * country_ie_integrity_changes - tells us if the country IE has changed
336 * @checksum: checksum of country IE of fields we are interested in
338 * If the country IE has not changed you can ignore it safely. This is
339 * useful to determine if two devices are seeing two different country IEs
340 * even on the same alpha2. Note that this will return false if no IE has
341 * been set on the wireless core yet.
343 static bool country_ie_integrity_changes(u32 checksum)
345 /* If no IE has been set then the checksum doesn't change */
346 if (unlikely(!last_request->country_ie_checksum))
348 if (unlikely(last_request->country_ie_checksum != checksum))
354 * This lets us keep regulatory code which is updated on a regulatory
355 * basis in userspace.
357 static int call_crda(const char *alpha2)
359 char country_env[9 + 2] = "COUNTRY=";
365 if (!is_world_regdom((char *) alpha2))
366 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
367 alpha2[0], alpha2[1]);
369 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
370 "regulatory domain\n");
372 country_env[8] = alpha2[0];
373 country_env[9] = alpha2[1];
375 return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp);
378 /* Used by nl80211 before kmalloc'ing our regulatory domain */
379 bool reg_is_valid_request(const char *alpha2)
381 assert_cfg80211_lock();
386 return alpha2_equal(last_request->alpha2, alpha2);
389 /* Sanity check on a regulatory rule */
390 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
392 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
395 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
398 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
401 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
403 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
404 freq_range->max_bandwidth_khz > freq_diff)
410 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
412 const struct ieee80211_reg_rule *reg_rule = NULL;
415 if (!rd->n_reg_rules)
418 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
421 for (i = 0; i < rd->n_reg_rules; i++) {
422 reg_rule = &rd->reg_rules[i];
423 if (!is_valid_reg_rule(reg_rule))
430 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
434 u32 start_freq_khz, end_freq_khz;
436 start_freq_khz = center_freq_khz - (bw_khz/2);
437 end_freq_khz = center_freq_khz + (bw_khz/2);
439 if (start_freq_khz >= freq_range->start_freq_khz &&
440 end_freq_khz <= freq_range->end_freq_khz)
447 * freq_in_rule_band - tells us if a frequency is in a frequency band
448 * @freq_range: frequency rule we want to query
449 * @freq_khz: frequency we are inquiring about
451 * This lets us know if a specific frequency rule is or is not relevant to
452 * a specific frequency's band. Bands are device specific and artificial
453 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
454 * safe for now to assume that a frequency rule should not be part of a
455 * frequency's band if the start freq or end freq are off by more than 2 GHz.
456 * This resolution can be lowered and should be considered as we add
457 * regulatory rule support for other "bands".
459 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
462 #define ONE_GHZ_IN_KHZ 1000000
463 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
465 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
468 #undef ONE_GHZ_IN_KHZ
472 * Converts a country IE to a regulatory domain. A regulatory domain
473 * structure has a lot of information which the IE doesn't yet have,
474 * so for the other values we use upper max values as we will intersect
475 * with our userspace regulatory agent to get lower bounds.
477 static struct ieee80211_regdomain *country_ie_2_rd(
482 struct ieee80211_regdomain *rd = NULL;
486 u32 num_rules = 0, size_of_regd = 0;
487 u8 *triplets_start = NULL;
488 u8 len_at_triplet = 0;
489 /* the last channel we have registered in a subband (triplet) */
490 int last_sub_max_channel = 0;
492 *checksum = 0xDEADBEEF;
494 /* Country IE requirements */
495 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
496 country_ie_len & 0x01);
498 alpha2[0] = country_ie[0];
499 alpha2[1] = country_ie[1];
502 * Third octet can be:
506 * anything else we assume is no restrictions
508 if (country_ie[2] == 'I')
509 flags = NL80211_RRF_NO_OUTDOOR;
510 else if (country_ie[2] == 'O')
511 flags = NL80211_RRF_NO_INDOOR;
516 triplets_start = country_ie;
517 len_at_triplet = country_ie_len;
519 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
522 * We need to build a reg rule for each triplet, but first we must
523 * calculate the number of reg rules we will need. We will need one
524 * for each channel subband
526 while (country_ie_len >= 3) {
528 struct ieee80211_country_ie_triplet *triplet =
529 (struct ieee80211_country_ie_triplet *) country_ie;
530 int cur_sub_max_channel = 0, cur_channel = 0;
532 if (triplet->ext.reg_extension_id >=
533 IEEE80211_COUNTRY_EXTENSION_ID) {
540 if (triplet->chans.first_channel <= 14)
541 end_channel = triplet->chans.first_channel +
542 triplet->chans.num_channels;
545 * 5 GHz -- For example in country IEs if the first
546 * channel given is 36 and the number of channels is 4
547 * then the individual channel numbers defined for the
548 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
549 * and not 36, 37, 38, 39.
551 * See: http://tinyurl.com/11d-clarification
553 end_channel = triplet->chans.first_channel +
554 (4 * (triplet->chans.num_channels - 1));
556 cur_channel = triplet->chans.first_channel;
557 cur_sub_max_channel = end_channel;
559 /* Basic sanity check */
560 if (cur_sub_max_channel < cur_channel)
564 * Do not allow overlapping channels. Also channels
565 * passed in each subband must be monotonically
568 if (last_sub_max_channel) {
569 if (cur_channel <= last_sub_max_channel)
571 if (cur_sub_max_channel <= last_sub_max_channel)
576 * When dot11RegulatoryClassesRequired is supported
577 * we can throw ext triplets as part of this soup,
578 * for now we don't care when those change as we
581 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
582 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
583 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
585 last_sub_max_channel = cur_sub_max_channel;
592 * Note: this is not a IEEE requirement but
593 * simply a memory requirement
595 if (num_rules > NL80211_MAX_SUPP_REG_RULES)
599 country_ie = triplets_start;
600 country_ie_len = len_at_triplet;
602 size_of_regd = sizeof(struct ieee80211_regdomain) +
603 (num_rules * sizeof(struct ieee80211_reg_rule));
605 rd = kzalloc(size_of_regd, GFP_KERNEL);
609 rd->n_reg_rules = num_rules;
610 rd->alpha2[0] = alpha2[0];
611 rd->alpha2[1] = alpha2[1];
613 /* This time around we fill in the rd */
614 while (country_ie_len >= 3) {
616 struct ieee80211_country_ie_triplet *triplet =
617 (struct ieee80211_country_ie_triplet *) country_ie;
618 struct ieee80211_reg_rule *reg_rule = NULL;
619 struct ieee80211_freq_range *freq_range = NULL;
620 struct ieee80211_power_rule *power_rule = NULL;
623 * Must parse if dot11RegulatoryClassesRequired is true,
624 * we don't support this yet
626 if (triplet->ext.reg_extension_id >=
627 IEEE80211_COUNTRY_EXTENSION_ID) {
633 reg_rule = &rd->reg_rules[i];
634 freq_range = ®_rule->freq_range;
635 power_rule = ®_rule->power_rule;
637 reg_rule->flags = flags;
640 if (triplet->chans.first_channel <= 14)
641 end_channel = triplet->chans.first_channel +
642 triplet->chans.num_channels;
644 end_channel = triplet->chans.first_channel +
645 (4 * (triplet->chans.num_channels - 1));
648 * The +10 is since the regulatory domain expects
649 * the actual band edge, not the center of freq for
650 * its start and end freqs, assuming 20 MHz bandwidth on
651 * the channels passed
653 freq_range->start_freq_khz =
654 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
655 triplet->chans.first_channel) - 10);
656 freq_range->end_freq_khz =
657 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
661 * These are large arbitrary values we use to intersect later.
662 * Increment this if we ever support >= 40 MHz channels
665 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
666 power_rule->max_antenna_gain = DBI_TO_MBI(100);
667 power_rule->max_eirp = DBM_TO_MBM(100);
673 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
681 * Helper for regdom_intersect(), this does the real
682 * mathematical intersection fun
684 static int reg_rules_intersect(
685 const struct ieee80211_reg_rule *rule1,
686 const struct ieee80211_reg_rule *rule2,
687 struct ieee80211_reg_rule *intersected_rule)
689 const struct ieee80211_freq_range *freq_range1, *freq_range2;
690 struct ieee80211_freq_range *freq_range;
691 const struct ieee80211_power_rule *power_rule1, *power_rule2;
692 struct ieee80211_power_rule *power_rule;
695 freq_range1 = &rule1->freq_range;
696 freq_range2 = &rule2->freq_range;
697 freq_range = &intersected_rule->freq_range;
699 power_rule1 = &rule1->power_rule;
700 power_rule2 = &rule2->power_rule;
701 power_rule = &intersected_rule->power_rule;
703 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
704 freq_range2->start_freq_khz);
705 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
706 freq_range2->end_freq_khz);
707 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
708 freq_range2->max_bandwidth_khz);
710 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
711 if (freq_range->max_bandwidth_khz > freq_diff)
712 freq_range->max_bandwidth_khz = freq_diff;
714 power_rule->max_eirp = min(power_rule1->max_eirp,
715 power_rule2->max_eirp);
716 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
717 power_rule2->max_antenna_gain);
719 intersected_rule->flags = (rule1->flags | rule2->flags);
721 if (!is_valid_reg_rule(intersected_rule))
728 * regdom_intersect - do the intersection between two regulatory domains
729 * @rd1: first regulatory domain
730 * @rd2: second regulatory domain
732 * Use this function to get the intersection between two regulatory domains.
733 * Once completed we will mark the alpha2 for the rd as intersected, "98",
734 * as no one single alpha2 can represent this regulatory domain.
736 * Returns a pointer to the regulatory domain structure which will hold the
737 * resulting intersection of rules between rd1 and rd2. We will
738 * kzalloc() this structure for you.
740 static struct ieee80211_regdomain *regdom_intersect(
741 const struct ieee80211_regdomain *rd1,
742 const struct ieee80211_regdomain *rd2)
746 unsigned int num_rules = 0, rule_idx = 0;
747 const struct ieee80211_reg_rule *rule1, *rule2;
748 struct ieee80211_reg_rule *intersected_rule;
749 struct ieee80211_regdomain *rd;
750 /* This is just a dummy holder to help us count */
751 struct ieee80211_reg_rule irule;
753 /* Uses the stack temporarily for counter arithmetic */
754 intersected_rule = &irule;
756 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
762 * First we get a count of the rules we'll need, then we actually
763 * build them. This is to so we can malloc() and free() a
764 * regdomain once. The reason we use reg_rules_intersect() here
765 * is it will return -EINVAL if the rule computed makes no sense.
766 * All rules that do check out OK are valid.
769 for (x = 0; x < rd1->n_reg_rules; x++) {
770 rule1 = &rd1->reg_rules[x];
771 for (y = 0; y < rd2->n_reg_rules; y++) {
772 rule2 = &rd2->reg_rules[y];
773 if (!reg_rules_intersect(rule1, rule2,
776 memset(intersected_rule, 0,
777 sizeof(struct ieee80211_reg_rule));
784 size_of_regd = sizeof(struct ieee80211_regdomain) +
785 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
787 rd = kzalloc(size_of_regd, GFP_KERNEL);
791 for (x = 0; x < rd1->n_reg_rules; x++) {
792 rule1 = &rd1->reg_rules[x];
793 for (y = 0; y < rd2->n_reg_rules; y++) {
794 rule2 = &rd2->reg_rules[y];
796 * This time around instead of using the stack lets
797 * write to the target rule directly saving ourselves
800 intersected_rule = &rd->reg_rules[rule_idx];
801 r = reg_rules_intersect(rule1, rule2,
804 * No need to memset here the intersected rule here as
805 * we're not using the stack anymore
813 if (rule_idx != num_rules) {
818 rd->n_reg_rules = num_rules;
826 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
827 * want to just have the channel structure use these
829 static u32 map_regdom_flags(u32 rd_flags)
831 u32 channel_flags = 0;
832 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
833 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
834 if (rd_flags & NL80211_RRF_NO_IBSS)
835 channel_flags |= IEEE80211_CHAN_NO_IBSS;
836 if (rd_flags & NL80211_RRF_DFS)
837 channel_flags |= IEEE80211_CHAN_RADAR;
838 return channel_flags;
841 static int freq_reg_info_regd(struct wiphy *wiphy,
844 const struct ieee80211_reg_rule **reg_rule,
845 const struct ieee80211_regdomain *custom_regd)
848 bool band_rule_found = false;
849 const struct ieee80211_regdomain *regd;
850 bool bw_fits = false;
853 desired_bw_khz = MHZ_TO_KHZ(20);
855 regd = custom_regd ? custom_regd : cfg80211_regdomain;
858 * Follow the driver's regulatory domain, if present, unless a country
859 * IE has been processed or a user wants to help complaince further
861 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
862 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
869 for (i = 0; i < regd->n_reg_rules; i++) {
870 const struct ieee80211_reg_rule *rr;
871 const struct ieee80211_freq_range *fr = NULL;
872 const struct ieee80211_power_rule *pr = NULL;
874 rr = ®d->reg_rules[i];
875 fr = &rr->freq_range;
876 pr = &rr->power_rule;
879 * We only need to know if one frequency rule was
880 * was in center_freq's band, that's enough, so lets
881 * not overwrite it once found
883 if (!band_rule_found)
884 band_rule_found = freq_in_rule_band(fr, center_freq);
886 bw_fits = reg_does_bw_fit(fr,
890 if (band_rule_found && bw_fits) {
896 if (!band_rule_found)
901 EXPORT_SYMBOL(freq_reg_info);
903 int freq_reg_info(struct wiphy *wiphy,
906 const struct ieee80211_reg_rule **reg_rule)
908 assert_cfg80211_lock();
909 return freq_reg_info_regd(wiphy,
917 * Note that right now we assume the desired channel bandwidth
918 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
919 * per channel, the primary and the extension channel). To support
920 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
921 * new ieee80211_channel.target_bw and re run the regulatory check
922 * on the wiphy with the target_bw specified. Then we can simply use
923 * that below for the desired_bw_khz below.
925 static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
926 unsigned int chan_idx)
929 u32 flags, bw_flags = 0;
930 u32 desired_bw_khz = MHZ_TO_KHZ(20);
931 const struct ieee80211_reg_rule *reg_rule = NULL;
932 const struct ieee80211_power_rule *power_rule = NULL;
933 const struct ieee80211_freq_range *freq_range = NULL;
934 struct ieee80211_supported_band *sband;
935 struct ieee80211_channel *chan;
936 struct wiphy *request_wiphy = NULL;
938 assert_cfg80211_lock();
940 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
942 sband = wiphy->bands[band];
943 BUG_ON(chan_idx >= sband->n_channels);
944 chan = &sband->channels[chan_idx];
946 flags = chan->orig_flags;
948 r = freq_reg_info(wiphy,
949 MHZ_TO_KHZ(chan->center_freq),
955 * This means no regulatory rule was found in the country IE
956 * with a frequency range on the center_freq's band, since
957 * IEEE-802.11 allows for a country IE to have a subset of the
958 * regulatory information provided in a country we ignore
959 * disabling the channel unless at least one reg rule was
960 * found on the center_freq's band. For details see this
963 * http://tinyurl.com/11d-clarification
966 last_request->initiator ==
967 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
968 #ifdef CONFIG_CFG80211_REG_DEBUG
969 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
970 "intact on %s - no rule found in band on "
972 chan->center_freq, wiphy_name(wiphy));
976 * In this case we know the country IE has at least one reg rule
977 * for the band so we respect its band definitions
979 #ifdef CONFIG_CFG80211_REG_DEBUG
980 if (last_request->initiator ==
981 NL80211_REGDOM_SET_BY_COUNTRY_IE)
982 printk(KERN_DEBUG "cfg80211: Disabling "
983 "channel %d MHz on %s due to "
985 chan->center_freq, wiphy_name(wiphy));
987 flags |= IEEE80211_CHAN_DISABLED;
993 power_rule = ®_rule->power_rule;
994 freq_range = ®_rule->freq_range;
996 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
997 bw_flags = IEEE80211_CHAN_NO_HT40;
999 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1000 request_wiphy && request_wiphy == wiphy &&
1001 request_wiphy->strict_regulatory) {
1003 * This gaurantees the driver's requested regulatory domain
1004 * will always be used as a base for further regulatory
1007 chan->flags = chan->orig_flags =
1008 map_regdom_flags(reg_rule->flags) | bw_flags;
1009 chan->max_antenna_gain = chan->orig_mag =
1010 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1011 chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz);
1012 chan->max_power = chan->orig_mpwr =
1013 (int) MBM_TO_DBM(power_rule->max_eirp);
1017 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1018 chan->max_antenna_gain = min(chan->orig_mag,
1019 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
1020 chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz);
1021 if (chan->orig_mpwr)
1022 chan->max_power = min(chan->orig_mpwr,
1023 (int) MBM_TO_DBM(power_rule->max_eirp));
1025 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1028 static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
1031 struct ieee80211_supported_band *sband;
1033 BUG_ON(!wiphy->bands[band]);
1034 sband = wiphy->bands[band];
1036 for (i = 0; i < sband->n_channels; i++)
1037 handle_channel(wiphy, band, i);
1040 static bool ignore_reg_update(struct wiphy *wiphy,
1041 enum nl80211_reg_initiator initiator)
1045 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1046 wiphy->custom_regulatory)
1049 * wiphy->regd will be set once the device has its own
1050 * desired regulatory domain set
1052 if (wiphy->strict_regulatory && !wiphy->regd &&
1053 !is_world_regdom(last_request->alpha2))
1058 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1060 struct cfg80211_registered_device *rdev;
1062 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1063 wiphy_update_regulatory(&rdev->wiphy, initiator);
1066 static void handle_reg_beacon(struct wiphy *wiphy,
1067 unsigned int chan_idx,
1068 struct reg_beacon *reg_beacon)
1070 struct ieee80211_supported_band *sband;
1071 struct ieee80211_channel *chan;
1072 bool channel_changed = false;
1073 struct ieee80211_channel chan_before;
1075 assert_cfg80211_lock();
1077 sband = wiphy->bands[reg_beacon->chan.band];
1078 chan = &sband->channels[chan_idx];
1080 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1083 if (chan->beacon_found)
1086 chan->beacon_found = true;
1088 chan_before.center_freq = chan->center_freq;
1089 chan_before.flags = chan->flags;
1091 if ((chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) &&
1092 !(chan->orig_flags & IEEE80211_CHAN_PASSIVE_SCAN)) {
1093 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
1094 channel_changed = true;
1097 if ((chan->flags & IEEE80211_CHAN_NO_IBSS) &&
1098 !(chan->orig_flags & IEEE80211_CHAN_NO_IBSS)) {
1099 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
1100 channel_changed = true;
1103 if (channel_changed)
1104 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1108 * Called when a scan on a wiphy finds a beacon on
1111 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1112 struct reg_beacon *reg_beacon)
1115 struct ieee80211_supported_band *sband;
1117 assert_cfg80211_lock();
1119 if (!wiphy->bands[reg_beacon->chan.band])
1122 sband = wiphy->bands[reg_beacon->chan.band];
1124 for (i = 0; i < sband->n_channels; i++)
1125 handle_reg_beacon(wiphy, i, reg_beacon);
1129 * Called upon reg changes or a new wiphy is added
1131 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1134 struct ieee80211_supported_band *sband;
1135 struct reg_beacon *reg_beacon;
1137 assert_cfg80211_lock();
1139 if (list_empty(®_beacon_list))
1142 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1143 if (!wiphy->bands[reg_beacon->chan.band])
1145 sband = wiphy->bands[reg_beacon->chan.band];
1146 for (i = 0; i < sband->n_channels; i++)
1147 handle_reg_beacon(wiphy, i, reg_beacon);
1151 static bool reg_is_world_roaming(struct wiphy *wiphy)
1153 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1154 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1157 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1158 wiphy->custom_regulatory)
1163 /* Reap the advantages of previously found beacons */
1164 static void reg_process_beacons(struct wiphy *wiphy)
1167 * Means we are just firing up cfg80211, so no beacons would
1168 * have been processed yet.
1172 if (!reg_is_world_roaming(wiphy))
1174 wiphy_update_beacon_reg(wiphy);
1177 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1181 if (chan->flags & IEEE80211_CHAN_DISABLED)
1183 /* This would happen when regulatory rules disallow HT40 completely */
1184 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1189 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1190 enum ieee80211_band band,
1191 unsigned int chan_idx)
1193 struct ieee80211_supported_band *sband;
1194 struct ieee80211_channel *channel;
1195 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1198 assert_cfg80211_lock();
1200 sband = wiphy->bands[band];
1201 BUG_ON(chan_idx >= sband->n_channels);
1202 channel = &sband->channels[chan_idx];
1204 if (is_ht40_not_allowed(channel)) {
1205 channel->flags |= IEEE80211_CHAN_NO_HT40;
1210 * We need to ensure the extension channels exist to
1211 * be able to use HT40- or HT40+, this finds them (or not)
1213 for (i = 0; i < sband->n_channels; i++) {
1214 struct ieee80211_channel *c = &sband->channels[i];
1215 if (c->center_freq == (channel->center_freq - 20))
1217 if (c->center_freq == (channel->center_freq + 20))
1222 * Please note that this assumes target bandwidth is 20 MHz,
1223 * if that ever changes we also need to change the below logic
1224 * to include that as well.
1226 if (is_ht40_not_allowed(channel_before))
1227 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1229 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1231 if (is_ht40_not_allowed(channel_after))
1232 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1234 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1237 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1238 enum ieee80211_band band)
1241 struct ieee80211_supported_band *sband;
1243 BUG_ON(!wiphy->bands[band]);
1244 sband = wiphy->bands[band];
1246 for (i = 0; i < sband->n_channels; i++)
1247 reg_process_ht_flags_channel(wiphy, band, i);
1250 static void reg_process_ht_flags(struct wiphy *wiphy)
1252 enum ieee80211_band band;
1257 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1258 if (wiphy->bands[band])
1259 reg_process_ht_flags_band(wiphy, band);
1264 void wiphy_update_regulatory(struct wiphy *wiphy,
1265 enum nl80211_reg_initiator initiator)
1267 enum ieee80211_band band;
1269 if (ignore_reg_update(wiphy, initiator))
1271 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1272 if (wiphy->bands[band])
1273 handle_band(wiphy, band);
1276 reg_process_beacons(wiphy);
1277 reg_process_ht_flags(wiphy);
1278 if (wiphy->reg_notifier)
1279 wiphy->reg_notifier(wiphy, last_request);
1282 static void handle_channel_custom(struct wiphy *wiphy,
1283 enum ieee80211_band band,
1284 unsigned int chan_idx,
1285 const struct ieee80211_regdomain *regd)
1288 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1290 const struct ieee80211_reg_rule *reg_rule = NULL;
1291 const struct ieee80211_power_rule *power_rule = NULL;
1292 const struct ieee80211_freq_range *freq_range = NULL;
1293 struct ieee80211_supported_band *sband;
1294 struct ieee80211_channel *chan;
1296 assert_cfg80211_lock();
1298 sband = wiphy->bands[band];
1299 BUG_ON(chan_idx >= sband->n_channels);
1300 chan = &sband->channels[chan_idx];
1302 r = freq_reg_info_regd(wiphy,
1303 MHZ_TO_KHZ(chan->center_freq),
1309 chan->flags = IEEE80211_CHAN_DISABLED;
1313 power_rule = ®_rule->power_rule;
1314 freq_range = ®_rule->freq_range;
1316 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1317 bw_flags = IEEE80211_CHAN_NO_HT40;
1319 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1320 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1321 chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz);
1322 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1325 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1326 const struct ieee80211_regdomain *regd)
1329 struct ieee80211_supported_band *sband;
1331 BUG_ON(!wiphy->bands[band]);
1332 sband = wiphy->bands[band];
1334 for (i = 0; i < sband->n_channels; i++)
1335 handle_channel_custom(wiphy, band, i, regd);
1338 /* Used by drivers prior to wiphy registration */
1339 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1340 const struct ieee80211_regdomain *regd)
1342 enum ieee80211_band band;
1343 unsigned int bands_set = 0;
1345 mutex_lock(&cfg80211_mutex);
1346 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1347 if (!wiphy->bands[band])
1349 handle_band_custom(wiphy, band, regd);
1352 mutex_unlock(&cfg80211_mutex);
1355 * no point in calling this if it won't have any effect
1356 * on your device's supportd bands.
1358 WARN_ON(!bands_set);
1360 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1362 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
1363 const struct ieee80211_regdomain *src_regd)
1365 struct ieee80211_regdomain *regd;
1366 int size_of_regd = 0;
1369 size_of_regd = sizeof(struct ieee80211_regdomain) +
1370 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
1372 regd = kzalloc(size_of_regd, GFP_KERNEL);
1376 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
1378 for (i = 0; i < src_regd->n_reg_rules; i++)
1379 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
1380 sizeof(struct ieee80211_reg_rule));
1387 * Return value which can be used by ignore_request() to indicate
1388 * it has been determined we should intersect two regulatory domains
1390 #define REG_INTERSECT 1
1392 /* This has the logic which determines when a new request
1393 * should be ignored. */
1394 static int ignore_request(struct wiphy *wiphy,
1395 struct regulatory_request *pending_request)
1397 struct wiphy *last_wiphy = NULL;
1399 assert_cfg80211_lock();
1401 /* All initial requests are respected */
1405 switch (pending_request->initiator) {
1406 case NL80211_REGDOM_SET_BY_CORE:
1408 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1410 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1412 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1414 if (last_request->initiator ==
1415 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1416 if (last_wiphy != wiphy) {
1418 * Two cards with two APs claiming different
1419 * different Country IE alpha2s. We could
1420 * intersect them, but that seems unlikely
1421 * to be correct. Reject second one for now.
1423 if (regdom_changes(pending_request->alpha2))
1428 * Two consecutive Country IE hints on the same wiphy.
1429 * This should be picked up early by the driver/stack
1431 if (WARN_ON(regdom_changes(pending_request->alpha2)))
1435 return REG_INTERSECT;
1436 case NL80211_REGDOM_SET_BY_DRIVER:
1437 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1438 if (is_old_static_regdom(cfg80211_regdomain))
1440 if (regdom_changes(pending_request->alpha2))
1446 * This would happen if you unplug and plug your card
1447 * back in or if you add a new device for which the previously
1448 * loaded card also agrees on the regulatory domain.
1450 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1451 !regdom_changes(pending_request->alpha2))
1454 return REG_INTERSECT;
1455 case NL80211_REGDOM_SET_BY_USER:
1456 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1457 return REG_INTERSECT;
1459 * If the user knows better the user should set the regdom
1460 * to their country before the IE is picked up
1462 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1463 last_request->intersect)
1466 * Process user requests only after previous user/driver/core
1467 * requests have been processed
1469 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1470 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1471 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1472 if (regdom_changes(last_request->alpha2))
1476 if (!is_old_static_regdom(cfg80211_regdomain) &&
1477 !regdom_changes(pending_request->alpha2))
1487 * __regulatory_hint - hint to the wireless core a regulatory domain
1488 * @wiphy: if the hint comes from country information from an AP, this
1489 * is required to be set to the wiphy that received the information
1490 * @pending_request: the regulatory request currently being processed
1492 * The Wireless subsystem can use this function to hint to the wireless core
1493 * what it believes should be the current regulatory domain.
1495 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1496 * already been set or other standard error codes.
1498 * Caller must hold &cfg80211_mutex
1500 static int __regulatory_hint(struct wiphy *wiphy,
1501 struct regulatory_request *pending_request)
1503 bool intersect = false;
1506 assert_cfg80211_lock();
1508 r = ignore_request(wiphy, pending_request);
1510 if (r == REG_INTERSECT) {
1511 if (pending_request->initiator ==
1512 NL80211_REGDOM_SET_BY_DRIVER) {
1513 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1515 kfree(pending_request);
1522 * If the regulatory domain being requested by the
1523 * driver has already been set just copy it to the
1526 if (r == -EALREADY &&
1527 pending_request->initiator ==
1528 NL80211_REGDOM_SET_BY_DRIVER) {
1529 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1531 kfree(pending_request);
1537 kfree(pending_request);
1542 kfree(last_request);
1544 last_request = pending_request;
1545 last_request->intersect = intersect;
1547 pending_request = NULL;
1549 /* When r == REG_INTERSECT we do need to call CRDA */
1552 * Since CRDA will not be called in this case as we already
1553 * have applied the requested regulatory domain before we just
1554 * inform userspace we have processed the request
1557 nl80211_send_reg_change_event(last_request);
1561 return call_crda(last_request->alpha2);
1564 /* This processes *all* regulatory hints */
1565 static void reg_process_hint(struct regulatory_request *reg_request)
1568 struct wiphy *wiphy = NULL;
1570 BUG_ON(!reg_request->alpha2);
1572 mutex_lock(&cfg80211_mutex);
1574 if (wiphy_idx_valid(reg_request->wiphy_idx))
1575 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1577 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1583 r = __regulatory_hint(wiphy, reg_request);
1584 /* This is required so that the orig_* parameters are saved */
1585 if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
1586 wiphy_update_regulatory(wiphy, reg_request->initiator);
1588 mutex_unlock(&cfg80211_mutex);
1591 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
1592 static void reg_process_pending_hints(void)
1594 struct regulatory_request *reg_request;
1596 spin_lock(®_requests_lock);
1597 while (!list_empty(®_requests_list)) {
1598 reg_request = list_first_entry(®_requests_list,
1599 struct regulatory_request,
1601 list_del_init(®_request->list);
1603 spin_unlock(®_requests_lock);
1604 reg_process_hint(reg_request);
1605 spin_lock(®_requests_lock);
1607 spin_unlock(®_requests_lock);
1610 /* Processes beacon hints -- this has nothing to do with country IEs */
1611 static void reg_process_pending_beacon_hints(void)
1613 struct cfg80211_registered_device *rdev;
1614 struct reg_beacon *pending_beacon, *tmp;
1616 mutex_lock(&cfg80211_mutex);
1618 /* This goes through the _pending_ beacon list */
1619 spin_lock_bh(®_pending_beacons_lock);
1621 if (list_empty(®_pending_beacons)) {
1622 spin_unlock_bh(®_pending_beacons_lock);
1626 list_for_each_entry_safe(pending_beacon, tmp,
1627 ®_pending_beacons, list) {
1629 list_del_init(&pending_beacon->list);
1631 /* Applies the beacon hint to current wiphys */
1632 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1633 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1635 /* Remembers the beacon hint for new wiphys or reg changes */
1636 list_add_tail(&pending_beacon->list, ®_beacon_list);
1639 spin_unlock_bh(®_pending_beacons_lock);
1641 mutex_unlock(&cfg80211_mutex);
1644 static void reg_todo(struct work_struct *work)
1646 reg_process_pending_hints();
1647 reg_process_pending_beacon_hints();
1650 static DECLARE_WORK(reg_work, reg_todo);
1652 static void queue_regulatory_request(struct regulatory_request *request)
1654 spin_lock(®_requests_lock);
1655 list_add_tail(&request->list, ®_requests_list);
1656 spin_unlock(®_requests_lock);
1658 schedule_work(®_work);
1661 /* Core regulatory hint -- happens once during cfg80211_init() */
1662 static int regulatory_hint_core(const char *alpha2)
1664 struct regulatory_request *request;
1666 BUG_ON(last_request);
1668 request = kzalloc(sizeof(struct regulatory_request),
1673 request->alpha2[0] = alpha2[0];
1674 request->alpha2[1] = alpha2[1];
1675 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1677 queue_regulatory_request(request);
1680 * This ensures last_request is populated once modules
1681 * come swinging in and calling regulatory hints and
1682 * wiphy_apply_custom_regulatory().
1684 flush_scheduled_work();
1690 int regulatory_hint_user(const char *alpha2)
1692 struct regulatory_request *request;
1696 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1700 request->wiphy_idx = WIPHY_IDX_STALE;
1701 request->alpha2[0] = alpha2[0];
1702 request->alpha2[1] = alpha2[1];
1703 request->initiator = NL80211_REGDOM_SET_BY_USER,
1705 queue_regulatory_request(request);
1711 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1713 struct regulatory_request *request;
1718 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1722 request->wiphy_idx = get_wiphy_idx(wiphy);
1724 /* Must have registered wiphy first */
1725 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1727 request->alpha2[0] = alpha2[0];
1728 request->alpha2[1] = alpha2[1];
1729 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1731 queue_regulatory_request(request);
1735 EXPORT_SYMBOL(regulatory_hint);
1737 static bool reg_same_country_ie_hint(struct wiphy *wiphy,
1738 u32 country_ie_checksum)
1740 struct wiphy *request_wiphy;
1742 assert_cfg80211_lock();
1744 if (unlikely(last_request->initiator !=
1745 NL80211_REGDOM_SET_BY_COUNTRY_IE))
1748 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1753 if (likely(request_wiphy != wiphy))
1754 return !country_ie_integrity_changes(country_ie_checksum);
1756 * We should not have let these through at this point, they
1757 * should have been picked up earlier by the first alpha2 check
1760 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
1765 void regulatory_hint_11d(struct wiphy *wiphy,
1769 struct ieee80211_regdomain *rd = NULL;
1772 enum environment_cap env = ENVIRON_ANY;
1773 struct regulatory_request *request;
1775 mutex_lock(&cfg80211_mutex);
1777 if (unlikely(!last_request)) {
1778 mutex_unlock(&cfg80211_mutex);
1782 /* IE len must be evenly divisible by 2 */
1783 if (country_ie_len & 0x01)
1786 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1790 * Pending country IE processing, this can happen after we
1791 * call CRDA and wait for a response if a beacon was received before
1792 * we were able to process the last regulatory_hint_11d() call
1794 if (country_ie_regdomain)
1797 alpha2[0] = country_ie[0];
1798 alpha2[1] = country_ie[1];
1800 if (country_ie[2] == 'I')
1801 env = ENVIRON_INDOOR;
1802 else if (country_ie[2] == 'O')
1803 env = ENVIRON_OUTDOOR;
1806 * We will run this for *every* beacon processed for the BSSID, so
1807 * we optimize an early check to exit out early if we don't have to
1810 if (likely(last_request->initiator ==
1811 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1812 wiphy_idx_valid(last_request->wiphy_idx))) {
1813 struct cfg80211_registered_device *rdev_last_ie;
1816 cfg80211_rdev_by_wiphy_idx(last_request->wiphy_idx);
1819 * Lets keep this simple -- we trust the first AP
1820 * after we intersect with CRDA
1822 if (likely(&rdev_last_ie->wiphy == wiphy)) {
1824 * Ignore IEs coming in on this wiphy with
1825 * the same alpha2 and environment cap
1827 if (likely(alpha2_equal(rdev_last_ie->country_ie_alpha2,
1829 env == rdev_last_ie->env)) {
1833 * the wiphy moved on to another BSSID or the AP
1834 * was reconfigured. XXX: We need to deal with the
1835 * case where the user suspends and goes to goes
1836 * to another country, and then gets IEs from an
1837 * AP with different settings
1842 * Ignore IEs coming in on two separate wiphys with
1843 * the same alpha2 and environment cap
1845 if (likely(alpha2_equal(rdev_last_ie->country_ie_alpha2,
1847 env == rdev_last_ie->env)) {
1850 /* We could potentially intersect though */
1855 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
1860 * This will not happen right now but we leave it here for the
1861 * the future when we want to add suspend/resume support and having
1862 * the user move to another country after doing so, or having the user
1863 * move to another AP. Right now we just trust the first AP.
1865 * If we hit this before we add this support we want to be informed of
1866 * it as it would indicate a mistake in the current design
1868 if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))
1871 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1876 * We keep this around for when CRDA comes back with a response so
1877 * we can intersect with that
1879 country_ie_regdomain = rd;
1881 request->wiphy_idx = get_wiphy_idx(wiphy);
1882 request->alpha2[0] = rd->alpha2[0];
1883 request->alpha2[1] = rd->alpha2[1];
1884 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1885 request->country_ie_checksum = checksum;
1886 request->country_ie_env = env;
1888 mutex_unlock(&cfg80211_mutex);
1890 queue_regulatory_request(request);
1897 mutex_unlock(&cfg80211_mutex);
1899 EXPORT_SYMBOL(regulatory_hint_11d);
1901 static bool freq_is_chan_12_13_14(u16 freq)
1903 if (freq == ieee80211_channel_to_frequency(12) ||
1904 freq == ieee80211_channel_to_frequency(13) ||
1905 freq == ieee80211_channel_to_frequency(14))
1910 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1911 struct ieee80211_channel *beacon_chan,
1914 struct reg_beacon *reg_beacon;
1916 if (likely((beacon_chan->beacon_found ||
1917 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1918 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1919 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1922 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1926 #ifdef CONFIG_CFG80211_REG_DEBUG
1927 printk(KERN_DEBUG "cfg80211: Found new beacon on "
1928 "frequency: %d MHz (Ch %d) on %s\n",
1929 beacon_chan->center_freq,
1930 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1933 memcpy(®_beacon->chan, beacon_chan,
1934 sizeof(struct ieee80211_channel));
1938 * Since we can be called from BH or and non-BH context
1939 * we must use spin_lock_bh()
1941 spin_lock_bh(®_pending_beacons_lock);
1942 list_add_tail(®_beacon->list, ®_pending_beacons);
1943 spin_unlock_bh(®_pending_beacons_lock);
1945 schedule_work(®_work);
1950 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1953 const struct ieee80211_reg_rule *reg_rule = NULL;
1954 const struct ieee80211_freq_range *freq_range = NULL;
1955 const struct ieee80211_power_rule *power_rule = NULL;
1957 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
1958 "(max_antenna_gain, max_eirp)\n");
1960 for (i = 0; i < rd->n_reg_rules; i++) {
1961 reg_rule = &rd->reg_rules[i];
1962 freq_range = ®_rule->freq_range;
1963 power_rule = ®_rule->power_rule;
1966 * There may not be documentation for max antenna gain
1967 * in certain regions
1969 if (power_rule->max_antenna_gain)
1970 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1971 "(%d mBi, %d mBm)\n",
1972 freq_range->start_freq_khz,
1973 freq_range->end_freq_khz,
1974 freq_range->max_bandwidth_khz,
1975 power_rule->max_antenna_gain,
1976 power_rule->max_eirp);
1978 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1980 freq_range->start_freq_khz,
1981 freq_range->end_freq_khz,
1982 freq_range->max_bandwidth_khz,
1983 power_rule->max_eirp);
1987 static void print_regdomain(const struct ieee80211_regdomain *rd)
1990 if (is_intersected_alpha2(rd->alpha2)) {
1992 if (last_request->initiator ==
1993 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1994 struct cfg80211_registered_device *rdev;
1995 rdev = cfg80211_rdev_by_wiphy_idx(
1996 last_request->wiphy_idx);
1998 printk(KERN_INFO "cfg80211: Current regulatory "
1999 "domain updated by AP to: %c%c\n",
2000 rdev->country_ie_alpha2[0],
2001 rdev->country_ie_alpha2[1]);
2003 printk(KERN_INFO "cfg80211: Current regulatory "
2004 "domain intersected: \n");
2006 printk(KERN_INFO "cfg80211: Current regulatory "
2007 "domain intersected: \n");
2008 } else if (is_world_regdom(rd->alpha2))
2009 printk(KERN_INFO "cfg80211: World regulatory "
2010 "domain updated:\n");
2012 if (is_unknown_alpha2(rd->alpha2))
2013 printk(KERN_INFO "cfg80211: Regulatory domain "
2014 "changed to driver built-in settings "
2015 "(unknown country)\n");
2017 printk(KERN_INFO "cfg80211: Regulatory domain "
2018 "changed to country: %c%c\n",
2019 rd->alpha2[0], rd->alpha2[1]);
2024 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2026 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
2027 rd->alpha2[0], rd->alpha2[1]);
2031 #ifdef CONFIG_CFG80211_REG_DEBUG
2032 static void reg_country_ie_process_debug(
2033 const struct ieee80211_regdomain *rd,
2034 const struct ieee80211_regdomain *country_ie_regdomain,
2035 const struct ieee80211_regdomain *intersected_rd)
2037 printk(KERN_DEBUG "cfg80211: Received country IE:\n");
2038 print_regdomain_info(country_ie_regdomain);
2039 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
2040 print_regdomain_info(rd);
2041 if (intersected_rd) {
2042 printk(KERN_DEBUG "cfg80211: We intersect both of these "
2044 print_regdomain_info(intersected_rd);
2047 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
2050 static inline void reg_country_ie_process_debug(
2051 const struct ieee80211_regdomain *rd,
2052 const struct ieee80211_regdomain *country_ie_regdomain,
2053 const struct ieee80211_regdomain *intersected_rd)
2058 /* Takes ownership of rd only if it doesn't fail */
2059 static int __set_regdom(const struct ieee80211_regdomain *rd)
2061 const struct ieee80211_regdomain *intersected_rd = NULL;
2062 struct cfg80211_registered_device *rdev = NULL;
2063 struct wiphy *request_wiphy;
2064 /* Some basic sanity checks first */
2066 if (is_world_regdom(rd->alpha2)) {
2067 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2069 update_world_regdomain(rd);
2073 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2074 !is_unknown_alpha2(rd->alpha2))
2081 * Lets only bother proceeding on the same alpha2 if the current
2082 * rd is non static (it means CRDA was present and was used last)
2083 * and the pending request came in from a country IE
2085 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2087 * If someone else asked us to change the rd lets only bother
2088 * checking if the alpha2 changes if CRDA was already called
2090 if (!is_old_static_regdom(cfg80211_regdomain) &&
2091 !regdom_changes(rd->alpha2))
2096 * Now lets set the regulatory domain, update all driver channels
2097 * and finally inform them of what we have done, in case they want
2098 * to review or adjust their own settings based on their own
2099 * internal EEPROM data
2102 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2105 if (!is_valid_rd(rd)) {
2106 printk(KERN_ERR "cfg80211: Invalid "
2107 "regulatory domain detected:\n");
2108 print_regdomain_info(rd);
2112 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2114 if (!last_request->intersect) {
2117 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
2119 cfg80211_regdomain = rd;
2124 * For a driver hint, lets copy the regulatory domain the
2125 * driver wanted to the wiphy to deal with conflicts
2129 * Userspace could have sent two replies with only
2130 * one kernel request.
2132 if (request_wiphy->regd)
2135 r = reg_copy_regd(&request_wiphy->regd, rd);
2140 cfg80211_regdomain = rd;
2144 /* Intersection requires a bit more work */
2146 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2148 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2149 if (!intersected_rd)
2153 * We can trash what CRDA provided now.
2154 * However if a driver requested this specific regulatory
2155 * domain we keep it for its private use
2157 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
2158 request_wiphy->regd = rd;
2165 cfg80211_regdomain = intersected_rd;
2171 * Country IE requests are handled a bit differently, we intersect
2172 * the country IE rd with what CRDA believes that country should have
2176 * Userspace could have sent two replies with only
2177 * one kernel request. By the second reply we would have
2178 * already processed and consumed the country_ie_regdomain.
2180 if (!country_ie_regdomain)
2182 BUG_ON(rd == country_ie_regdomain);
2185 * Intersect what CRDA returned and our what we
2186 * had built from the Country IE received
2189 intersected_rd = regdom_intersect(rd, country_ie_regdomain);
2191 reg_country_ie_process_debug(rd,
2192 country_ie_regdomain,
2195 kfree(country_ie_regdomain);
2196 country_ie_regdomain = NULL;
2198 if (!intersected_rd)
2201 rdev = wiphy_to_dev(request_wiphy);
2203 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2204 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2205 rdev->env = last_request->country_ie_env;
2207 BUG_ON(intersected_rd == rd);
2213 cfg80211_regdomain = intersected_rd;
2220 * Use this call to set the current regulatory domain. Conflicts with
2221 * multiple drivers can be ironed out later. Caller must've already
2222 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2224 int set_regdom(const struct ieee80211_regdomain *rd)
2228 assert_cfg80211_lock();
2230 /* Note that this doesn't update the wiphys, this is done below */
2231 r = __set_regdom(rd);
2237 /* This would make this whole thing pointless */
2238 if (!last_request->intersect)
2239 BUG_ON(rd != cfg80211_regdomain);
2241 /* update all wiphys now with the new established regulatory domain */
2242 update_all_wiphy_regulatory(last_request->initiator);
2244 print_regdomain(cfg80211_regdomain);
2246 nl80211_send_reg_change_event(last_request);
2251 /* Caller must hold cfg80211_mutex */
2252 void reg_device_remove(struct wiphy *wiphy)
2254 struct wiphy *request_wiphy = NULL;
2256 assert_cfg80211_lock();
2261 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2263 if (!request_wiphy || request_wiphy != wiphy)
2266 last_request->wiphy_idx = WIPHY_IDX_STALE;
2267 last_request->country_ie_env = ENVIRON_ANY;
2270 int regulatory_init(void)
2274 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2275 if (IS_ERR(reg_pdev))
2276 return PTR_ERR(reg_pdev);
2278 spin_lock_init(®_requests_lock);
2279 spin_lock_init(®_pending_beacons_lock);
2281 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
2282 cfg80211_regdomain = static_regdom(ieee80211_regdom);
2284 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
2285 print_regdomain_info(cfg80211_regdomain);
2287 cfg80211_regdomain = cfg80211_world_regdom;
2290 /* We always try to get an update for the static regdomain */
2291 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2296 * N.B. kobject_uevent_env() can fail mainly for when we're out
2297 * memory which is handled and propagated appropriately above
2298 * but it can also fail during a netlink_broadcast() or during
2299 * early boot for call_usermodehelper(). For now treat these
2300 * errors as non-fatal.
2302 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
2303 "to call CRDA during init");
2304 #ifdef CONFIG_CFG80211_REG_DEBUG
2305 /* We want to find out exactly why when debugging */
2311 * Finally, if the user set the module parameter treat it
2314 if (!is_world_regdom(ieee80211_regdom))
2315 regulatory_hint_user(ieee80211_regdom);
2320 void regulatory_exit(void)
2322 struct regulatory_request *reg_request, *tmp;
2323 struct reg_beacon *reg_beacon, *btmp;
2325 cancel_work_sync(®_work);
2327 mutex_lock(&cfg80211_mutex);
2331 kfree(country_ie_regdomain);
2332 country_ie_regdomain = NULL;
2334 kfree(last_request);
2336 platform_device_unregister(reg_pdev);
2338 spin_lock_bh(®_pending_beacons_lock);
2339 if (!list_empty(®_pending_beacons)) {
2340 list_for_each_entry_safe(reg_beacon, btmp,
2341 ®_pending_beacons, list) {
2342 list_del(®_beacon->list);
2346 spin_unlock_bh(®_pending_beacons_lock);
2348 if (!list_empty(®_beacon_list)) {
2349 list_for_each_entry_safe(reg_beacon, btmp,
2350 ®_beacon_list, list) {
2351 list_del(®_beacon->list);
2356 spin_lock(®_requests_lock);
2357 if (!list_empty(®_requests_list)) {
2358 list_for_each_entry_safe(reg_request, tmp,
2359 ®_requests_list, list) {
2360 list_del(®_request->list);
2364 spin_unlock(®_requests_lock);
2366 mutex_unlock(&cfg80211_mutex);