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;
66 * Protects static reg.c components:
67 * - cfg80211_world_regdom
69 * - country_ie_regdomain
72 DEFINE_MUTEX(reg_mutex);
73 #define assert_reg_lock() WARN_ON(!mutex_is_locked(®_mutex))
75 /* Used to queue up regulatory hints */
76 static LIST_HEAD(reg_requests_list);
77 static spinlock_t reg_requests_lock;
79 /* Used to queue up beacon hints for review */
80 static LIST_HEAD(reg_pending_beacons);
81 static spinlock_t reg_pending_beacons_lock;
83 /* Used to keep track of processed beacon hints */
84 static LIST_HEAD(reg_beacon_list);
87 struct list_head list;
88 struct ieee80211_channel chan;
91 /* We keep a static world regulatory domain in case of the absence of CRDA */
92 static const struct ieee80211_regdomain world_regdom = {
96 /* IEEE 802.11b/g, channels 1..11 */
97 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
98 /* IEEE 802.11b/g, channels 12..13. No HT40
99 * channel fits here. */
100 REG_RULE(2467-10, 2472+10, 20, 6, 20,
101 NL80211_RRF_PASSIVE_SCAN |
102 NL80211_RRF_NO_IBSS),
103 /* IEEE 802.11 channel 14 - Only JP enables
104 * this and for 802.11b only */
105 REG_RULE(2484-10, 2484+10, 20, 6, 20,
106 NL80211_RRF_PASSIVE_SCAN |
107 NL80211_RRF_NO_IBSS |
108 NL80211_RRF_NO_OFDM),
109 /* IEEE 802.11a, channel 36..48 */
110 REG_RULE(5180-10, 5240+10, 40, 6, 20,
111 NL80211_RRF_PASSIVE_SCAN |
112 NL80211_RRF_NO_IBSS),
114 /* NB: 5260 MHz - 5700 MHz requies DFS */
116 /* IEEE 802.11a, channel 149..165 */
117 REG_RULE(5745-10, 5825+10, 40, 6, 20,
118 NL80211_RRF_PASSIVE_SCAN |
119 NL80211_RRF_NO_IBSS),
123 static const struct ieee80211_regdomain *cfg80211_world_regdom =
126 static char *ieee80211_regdom = "00";
128 module_param(ieee80211_regdom, charp, 0444);
129 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
131 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
133 * We assume 40 MHz bandwidth for the old regulatory work.
134 * We make emphasis we are using the exact same frequencies
138 static const struct ieee80211_regdomain us_regdom = {
142 /* IEEE 802.11b/g, channels 1..11 */
143 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
144 /* IEEE 802.11a, channel 36 */
145 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
146 /* IEEE 802.11a, channel 40 */
147 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
148 /* IEEE 802.11a, channel 44 */
149 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
150 /* IEEE 802.11a, channels 48..64 */
151 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
152 /* IEEE 802.11a, channels 149..165, outdoor */
153 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
157 static const struct ieee80211_regdomain jp_regdom = {
161 /* IEEE 802.11b/g, channels 1..14 */
162 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
163 /* IEEE 802.11a, channels 34..48 */
164 REG_RULE(5170-10, 5240+10, 40, 6, 20,
165 NL80211_RRF_PASSIVE_SCAN),
166 /* IEEE 802.11a, channels 52..64 */
167 REG_RULE(5260-10, 5320+10, 40, 6, 20,
168 NL80211_RRF_NO_IBSS |
173 static const struct ieee80211_regdomain eu_regdom = {
176 * This alpha2 is bogus, we leave it here just for stupid
177 * backward compatibility
181 /* IEEE 802.11b/g, channels 1..13 */
182 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
183 /* IEEE 802.11a, channel 36 */
184 REG_RULE(5180-10, 5180+10, 40, 6, 23,
185 NL80211_RRF_PASSIVE_SCAN),
186 /* IEEE 802.11a, channel 40 */
187 REG_RULE(5200-10, 5200+10, 40, 6, 23,
188 NL80211_RRF_PASSIVE_SCAN),
189 /* IEEE 802.11a, channel 44 */
190 REG_RULE(5220-10, 5220+10, 40, 6, 23,
191 NL80211_RRF_PASSIVE_SCAN),
192 /* IEEE 802.11a, channels 48..64 */
193 REG_RULE(5240-10, 5320+10, 40, 6, 20,
194 NL80211_RRF_NO_IBSS |
196 /* IEEE 802.11a, channels 100..140 */
197 REG_RULE(5500-10, 5700+10, 40, 6, 30,
198 NL80211_RRF_NO_IBSS |
203 static const struct ieee80211_regdomain *static_regdom(char *alpha2)
205 if (alpha2[0] == 'U' && alpha2[1] == 'S')
207 if (alpha2[0] == 'J' && alpha2[1] == 'P')
209 if (alpha2[0] == 'E' && alpha2[1] == 'U')
211 /* Default, as per the old rules */
215 static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
217 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
222 static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
228 static void reset_regdomains(void)
230 /* avoid freeing static information or freeing something twice */
231 if (cfg80211_regdomain == cfg80211_world_regdom)
232 cfg80211_regdomain = NULL;
233 if (cfg80211_world_regdom == &world_regdom)
234 cfg80211_world_regdom = NULL;
235 if (cfg80211_regdomain == &world_regdom)
236 cfg80211_regdomain = NULL;
237 if (is_old_static_regdom(cfg80211_regdomain))
238 cfg80211_regdomain = NULL;
240 kfree(cfg80211_regdomain);
241 kfree(cfg80211_world_regdom);
243 cfg80211_world_regdom = &world_regdom;
244 cfg80211_regdomain = NULL;
248 * Dynamic world regulatory domain requested by the wireless
249 * core upon initialization
251 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
253 BUG_ON(!last_request);
257 cfg80211_world_regdom = rd;
258 cfg80211_regdomain = rd;
261 bool is_world_regdom(const char *alpha2)
265 if (alpha2[0] == '0' && alpha2[1] == '0')
270 static bool is_alpha2_set(const char *alpha2)
274 if (alpha2[0] != 0 && alpha2[1] != 0)
279 static bool is_alpha_upper(char letter)
282 if (letter >= 65 && letter <= 90)
287 static bool is_unknown_alpha2(const char *alpha2)
292 * Special case where regulatory domain was built by driver
293 * but a specific alpha2 cannot be determined
295 if (alpha2[0] == '9' && alpha2[1] == '9')
300 static bool is_intersected_alpha2(const char *alpha2)
305 * Special case where regulatory domain is the
306 * result of an intersection between two regulatory domain
309 if (alpha2[0] == '9' && alpha2[1] == '8')
314 static bool is_an_alpha2(const char *alpha2)
318 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
323 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
325 if (!alpha2_x || !alpha2_y)
327 if (alpha2_x[0] == alpha2_y[0] &&
328 alpha2_x[1] == alpha2_y[1])
333 static bool regdom_changes(const char *alpha2)
335 assert_cfg80211_lock();
337 if (!cfg80211_regdomain)
339 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
345 * country_ie_integrity_changes - tells us if the country IE has changed
346 * @checksum: checksum of country IE of fields we are interested in
348 * If the country IE has not changed you can ignore it safely. This is
349 * useful to determine if two devices are seeing two different country IEs
350 * even on the same alpha2. Note that this will return false if no IE has
351 * been set on the wireless core yet.
353 static bool country_ie_integrity_changes(u32 checksum)
355 /* If no IE has been set then the checksum doesn't change */
356 if (unlikely(!last_request->country_ie_checksum))
358 if (unlikely(last_request->country_ie_checksum != checksum))
364 * This lets us keep regulatory code which is updated on a regulatory
365 * basis in userspace.
367 static int call_crda(const char *alpha2)
369 char country_env[9 + 2] = "COUNTRY=";
375 if (!is_world_regdom((char *) alpha2))
376 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
377 alpha2[0], alpha2[1]);
379 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
380 "regulatory domain\n");
382 country_env[8] = alpha2[0];
383 country_env[9] = alpha2[1];
385 return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp);
388 /* Used by nl80211 before kmalloc'ing our regulatory domain */
389 bool reg_is_valid_request(const char *alpha2)
391 assert_cfg80211_lock();
396 return alpha2_equal(last_request->alpha2, alpha2);
399 /* Sanity check on a regulatory rule */
400 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
402 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
405 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
408 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
411 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
413 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
414 freq_range->max_bandwidth_khz > freq_diff)
420 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
422 const struct ieee80211_reg_rule *reg_rule = NULL;
425 if (!rd->n_reg_rules)
428 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
431 for (i = 0; i < rd->n_reg_rules; i++) {
432 reg_rule = &rd->reg_rules[i];
433 if (!is_valid_reg_rule(reg_rule))
440 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
444 u32 start_freq_khz, end_freq_khz;
446 start_freq_khz = center_freq_khz - (bw_khz/2);
447 end_freq_khz = center_freq_khz + (bw_khz/2);
449 if (start_freq_khz >= freq_range->start_freq_khz &&
450 end_freq_khz <= freq_range->end_freq_khz)
457 * freq_in_rule_band - tells us if a frequency is in a frequency band
458 * @freq_range: frequency rule we want to query
459 * @freq_khz: frequency we are inquiring about
461 * This lets us know if a specific frequency rule is or is not relevant to
462 * a specific frequency's band. Bands are device specific and artificial
463 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
464 * safe for now to assume that a frequency rule should not be part of a
465 * frequency's band if the start freq or end freq are off by more than 2 GHz.
466 * This resolution can be lowered and should be considered as we add
467 * regulatory rule support for other "bands".
469 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
472 #define ONE_GHZ_IN_KHZ 1000000
473 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
475 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
478 #undef ONE_GHZ_IN_KHZ
482 * Converts a country IE to a regulatory domain. A regulatory domain
483 * structure has a lot of information which the IE doesn't yet have,
484 * so for the other values we use upper max values as we will intersect
485 * with our userspace regulatory agent to get lower bounds.
487 static struct ieee80211_regdomain *country_ie_2_rd(
492 struct ieee80211_regdomain *rd = NULL;
496 u32 num_rules = 0, size_of_regd = 0;
497 u8 *triplets_start = NULL;
498 u8 len_at_triplet = 0;
499 /* the last channel we have registered in a subband (triplet) */
500 int last_sub_max_channel = 0;
502 *checksum = 0xDEADBEEF;
504 /* Country IE requirements */
505 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
506 country_ie_len & 0x01);
508 alpha2[0] = country_ie[0];
509 alpha2[1] = country_ie[1];
512 * Third octet can be:
516 * anything else we assume is no restrictions
518 if (country_ie[2] == 'I')
519 flags = NL80211_RRF_NO_OUTDOOR;
520 else if (country_ie[2] == 'O')
521 flags = NL80211_RRF_NO_INDOOR;
526 triplets_start = country_ie;
527 len_at_triplet = country_ie_len;
529 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
532 * We need to build a reg rule for each triplet, but first we must
533 * calculate the number of reg rules we will need. We will need one
534 * for each channel subband
536 while (country_ie_len >= 3) {
538 struct ieee80211_country_ie_triplet *triplet =
539 (struct ieee80211_country_ie_triplet *) country_ie;
540 int cur_sub_max_channel = 0, cur_channel = 0;
542 if (triplet->ext.reg_extension_id >=
543 IEEE80211_COUNTRY_EXTENSION_ID) {
550 if (triplet->chans.first_channel <= 14)
551 end_channel = triplet->chans.first_channel +
552 triplet->chans.num_channels;
555 * 5 GHz -- For example in country IEs if the first
556 * channel given is 36 and the number of channels is 4
557 * then the individual channel numbers defined for the
558 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
559 * and not 36, 37, 38, 39.
561 * See: http://tinyurl.com/11d-clarification
563 end_channel = triplet->chans.first_channel +
564 (4 * (triplet->chans.num_channels - 1));
566 cur_channel = triplet->chans.first_channel;
567 cur_sub_max_channel = end_channel;
569 /* Basic sanity check */
570 if (cur_sub_max_channel < cur_channel)
574 * Do not allow overlapping channels. Also channels
575 * passed in each subband must be monotonically
578 if (last_sub_max_channel) {
579 if (cur_channel <= last_sub_max_channel)
581 if (cur_sub_max_channel <= last_sub_max_channel)
586 * When dot11RegulatoryClassesRequired is supported
587 * we can throw ext triplets as part of this soup,
588 * for now we don't care when those change as we
591 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
592 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
593 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
595 last_sub_max_channel = cur_sub_max_channel;
602 * Note: this is not a IEEE requirement but
603 * simply a memory requirement
605 if (num_rules > NL80211_MAX_SUPP_REG_RULES)
609 country_ie = triplets_start;
610 country_ie_len = len_at_triplet;
612 size_of_regd = sizeof(struct ieee80211_regdomain) +
613 (num_rules * sizeof(struct ieee80211_reg_rule));
615 rd = kzalloc(size_of_regd, GFP_KERNEL);
619 rd->n_reg_rules = num_rules;
620 rd->alpha2[0] = alpha2[0];
621 rd->alpha2[1] = alpha2[1];
623 /* This time around we fill in the rd */
624 while (country_ie_len >= 3) {
626 struct ieee80211_country_ie_triplet *triplet =
627 (struct ieee80211_country_ie_triplet *) country_ie;
628 struct ieee80211_reg_rule *reg_rule = NULL;
629 struct ieee80211_freq_range *freq_range = NULL;
630 struct ieee80211_power_rule *power_rule = NULL;
633 * Must parse if dot11RegulatoryClassesRequired is true,
634 * we don't support this yet
636 if (triplet->ext.reg_extension_id >=
637 IEEE80211_COUNTRY_EXTENSION_ID) {
643 reg_rule = &rd->reg_rules[i];
644 freq_range = ®_rule->freq_range;
645 power_rule = ®_rule->power_rule;
647 reg_rule->flags = flags;
650 if (triplet->chans.first_channel <= 14)
651 end_channel = triplet->chans.first_channel +
652 triplet->chans.num_channels;
654 end_channel = triplet->chans.first_channel +
655 (4 * (triplet->chans.num_channels - 1));
658 * The +10 is since the regulatory domain expects
659 * the actual band edge, not the center of freq for
660 * its start and end freqs, assuming 20 MHz bandwidth on
661 * the channels passed
663 freq_range->start_freq_khz =
664 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
665 triplet->chans.first_channel) - 10);
666 freq_range->end_freq_khz =
667 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
671 * These are large arbitrary values we use to intersect later.
672 * Increment this if we ever support >= 40 MHz channels
675 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
676 power_rule->max_antenna_gain = DBI_TO_MBI(100);
677 power_rule->max_eirp = DBM_TO_MBM(100);
683 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
691 * Helper for regdom_intersect(), this does the real
692 * mathematical intersection fun
694 static int reg_rules_intersect(
695 const struct ieee80211_reg_rule *rule1,
696 const struct ieee80211_reg_rule *rule2,
697 struct ieee80211_reg_rule *intersected_rule)
699 const struct ieee80211_freq_range *freq_range1, *freq_range2;
700 struct ieee80211_freq_range *freq_range;
701 const struct ieee80211_power_rule *power_rule1, *power_rule2;
702 struct ieee80211_power_rule *power_rule;
705 freq_range1 = &rule1->freq_range;
706 freq_range2 = &rule2->freq_range;
707 freq_range = &intersected_rule->freq_range;
709 power_rule1 = &rule1->power_rule;
710 power_rule2 = &rule2->power_rule;
711 power_rule = &intersected_rule->power_rule;
713 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
714 freq_range2->start_freq_khz);
715 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
716 freq_range2->end_freq_khz);
717 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
718 freq_range2->max_bandwidth_khz);
720 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
721 if (freq_range->max_bandwidth_khz > freq_diff)
722 freq_range->max_bandwidth_khz = freq_diff;
724 power_rule->max_eirp = min(power_rule1->max_eirp,
725 power_rule2->max_eirp);
726 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
727 power_rule2->max_antenna_gain);
729 intersected_rule->flags = (rule1->flags | rule2->flags);
731 if (!is_valid_reg_rule(intersected_rule))
738 * regdom_intersect - do the intersection between two regulatory domains
739 * @rd1: first regulatory domain
740 * @rd2: second regulatory domain
742 * Use this function to get the intersection between two regulatory domains.
743 * Once completed we will mark the alpha2 for the rd as intersected, "98",
744 * as no one single alpha2 can represent this regulatory domain.
746 * Returns a pointer to the regulatory domain structure which will hold the
747 * resulting intersection of rules between rd1 and rd2. We will
748 * kzalloc() this structure for you.
750 static struct ieee80211_regdomain *regdom_intersect(
751 const struct ieee80211_regdomain *rd1,
752 const struct ieee80211_regdomain *rd2)
756 unsigned int num_rules = 0, rule_idx = 0;
757 const struct ieee80211_reg_rule *rule1, *rule2;
758 struct ieee80211_reg_rule *intersected_rule;
759 struct ieee80211_regdomain *rd;
760 /* This is just a dummy holder to help us count */
761 struct ieee80211_reg_rule irule;
763 /* Uses the stack temporarily for counter arithmetic */
764 intersected_rule = &irule;
766 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
772 * First we get a count of the rules we'll need, then we actually
773 * build them. This is to so we can malloc() and free() a
774 * regdomain once. The reason we use reg_rules_intersect() here
775 * is it will return -EINVAL if the rule computed makes no sense.
776 * All rules that do check out OK are valid.
779 for (x = 0; x < rd1->n_reg_rules; x++) {
780 rule1 = &rd1->reg_rules[x];
781 for (y = 0; y < rd2->n_reg_rules; y++) {
782 rule2 = &rd2->reg_rules[y];
783 if (!reg_rules_intersect(rule1, rule2,
786 memset(intersected_rule, 0,
787 sizeof(struct ieee80211_reg_rule));
794 size_of_regd = sizeof(struct ieee80211_regdomain) +
795 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
797 rd = kzalloc(size_of_regd, GFP_KERNEL);
801 for (x = 0; x < rd1->n_reg_rules; x++) {
802 rule1 = &rd1->reg_rules[x];
803 for (y = 0; y < rd2->n_reg_rules; y++) {
804 rule2 = &rd2->reg_rules[y];
806 * This time around instead of using the stack lets
807 * write to the target rule directly saving ourselves
810 intersected_rule = &rd->reg_rules[rule_idx];
811 r = reg_rules_intersect(rule1, rule2,
814 * No need to memset here the intersected rule here as
815 * we're not using the stack anymore
823 if (rule_idx != num_rules) {
828 rd->n_reg_rules = num_rules;
836 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
837 * want to just have the channel structure use these
839 static u32 map_regdom_flags(u32 rd_flags)
841 u32 channel_flags = 0;
842 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
843 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
844 if (rd_flags & NL80211_RRF_NO_IBSS)
845 channel_flags |= IEEE80211_CHAN_NO_IBSS;
846 if (rd_flags & NL80211_RRF_DFS)
847 channel_flags |= IEEE80211_CHAN_RADAR;
848 return channel_flags;
851 static int freq_reg_info_regd(struct wiphy *wiphy,
854 const struct ieee80211_reg_rule **reg_rule,
855 const struct ieee80211_regdomain *custom_regd)
858 bool band_rule_found = false;
859 const struct ieee80211_regdomain *regd;
860 bool bw_fits = false;
863 desired_bw_khz = MHZ_TO_KHZ(20);
865 regd = custom_regd ? custom_regd : cfg80211_regdomain;
868 * Follow the driver's regulatory domain, if present, unless a country
869 * IE has been processed or a user wants to help complaince further
871 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
872 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
879 for (i = 0; i < regd->n_reg_rules; i++) {
880 const struct ieee80211_reg_rule *rr;
881 const struct ieee80211_freq_range *fr = NULL;
882 const struct ieee80211_power_rule *pr = NULL;
884 rr = ®d->reg_rules[i];
885 fr = &rr->freq_range;
886 pr = &rr->power_rule;
889 * We only need to know if one frequency rule was
890 * was in center_freq's band, that's enough, so lets
891 * not overwrite it once found
893 if (!band_rule_found)
894 band_rule_found = freq_in_rule_band(fr, center_freq);
896 bw_fits = reg_does_bw_fit(fr,
900 if (band_rule_found && bw_fits) {
906 if (!band_rule_found)
911 EXPORT_SYMBOL(freq_reg_info);
913 int freq_reg_info(struct wiphy *wiphy,
916 const struct ieee80211_reg_rule **reg_rule)
918 assert_cfg80211_lock();
919 return freq_reg_info_regd(wiphy,
927 * Note that right now we assume the desired channel bandwidth
928 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
929 * per channel, the primary and the extension channel). To support
930 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
931 * new ieee80211_channel.target_bw and re run the regulatory check
932 * on the wiphy with the target_bw specified. Then we can simply use
933 * that below for the desired_bw_khz below.
935 static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
936 unsigned int chan_idx)
939 u32 flags, bw_flags = 0;
940 u32 desired_bw_khz = MHZ_TO_KHZ(20);
941 const struct ieee80211_reg_rule *reg_rule = NULL;
942 const struct ieee80211_power_rule *power_rule = NULL;
943 const struct ieee80211_freq_range *freq_range = NULL;
944 struct ieee80211_supported_band *sband;
945 struct ieee80211_channel *chan;
946 struct wiphy *request_wiphy = NULL;
948 assert_cfg80211_lock();
950 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
952 sband = wiphy->bands[band];
953 BUG_ON(chan_idx >= sband->n_channels);
954 chan = &sband->channels[chan_idx];
956 flags = chan->orig_flags;
958 r = freq_reg_info(wiphy,
959 MHZ_TO_KHZ(chan->center_freq),
965 * This means no regulatory rule was found in the country IE
966 * with a frequency range on the center_freq's band, since
967 * IEEE-802.11 allows for a country IE to have a subset of the
968 * regulatory information provided in a country we ignore
969 * disabling the channel unless at least one reg rule was
970 * found on the center_freq's band. For details see this
973 * http://tinyurl.com/11d-clarification
976 last_request->initiator ==
977 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
978 #ifdef CONFIG_CFG80211_REG_DEBUG
979 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
980 "intact on %s - no rule found in band on "
982 chan->center_freq, wiphy_name(wiphy));
986 * In this case we know the country IE has at least one reg rule
987 * for the band so we respect its band definitions
989 #ifdef CONFIG_CFG80211_REG_DEBUG
990 if (last_request->initiator ==
991 NL80211_REGDOM_SET_BY_COUNTRY_IE)
992 printk(KERN_DEBUG "cfg80211: Disabling "
993 "channel %d MHz on %s due to "
995 chan->center_freq, wiphy_name(wiphy));
997 flags |= IEEE80211_CHAN_DISABLED;
1003 power_rule = ®_rule->power_rule;
1004 freq_range = ®_rule->freq_range;
1006 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1007 bw_flags = IEEE80211_CHAN_NO_HT40;
1009 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1010 request_wiphy && request_wiphy == wiphy &&
1011 request_wiphy->strict_regulatory) {
1013 * This gaurantees the driver's requested regulatory domain
1014 * will always be used as a base for further regulatory
1017 chan->flags = chan->orig_flags =
1018 map_regdom_flags(reg_rule->flags) | bw_flags;
1019 chan->max_antenna_gain = chan->orig_mag =
1020 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1021 chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz);
1022 chan->max_power = chan->orig_mpwr =
1023 (int) MBM_TO_DBM(power_rule->max_eirp);
1027 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1028 chan->max_antenna_gain = min(chan->orig_mag,
1029 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
1030 chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz);
1031 if (chan->orig_mpwr)
1032 chan->max_power = min(chan->orig_mpwr,
1033 (int) MBM_TO_DBM(power_rule->max_eirp));
1035 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1038 static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
1041 struct ieee80211_supported_band *sband;
1043 BUG_ON(!wiphy->bands[band]);
1044 sband = wiphy->bands[band];
1046 for (i = 0; i < sband->n_channels; i++)
1047 handle_channel(wiphy, band, i);
1050 static bool ignore_reg_update(struct wiphy *wiphy,
1051 enum nl80211_reg_initiator initiator)
1055 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1056 wiphy->custom_regulatory)
1059 * wiphy->regd will be set once the device has its own
1060 * desired regulatory domain set
1062 if (wiphy->strict_regulatory && !wiphy->regd &&
1063 !is_world_regdom(last_request->alpha2))
1068 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1070 struct cfg80211_registered_device *rdev;
1072 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1073 wiphy_update_regulatory(&rdev->wiphy, initiator);
1076 static void handle_reg_beacon(struct wiphy *wiphy,
1077 unsigned int chan_idx,
1078 struct reg_beacon *reg_beacon)
1080 struct ieee80211_supported_band *sband;
1081 struct ieee80211_channel *chan;
1082 bool channel_changed = false;
1083 struct ieee80211_channel chan_before;
1085 assert_cfg80211_lock();
1087 sband = wiphy->bands[reg_beacon->chan.band];
1088 chan = &sband->channels[chan_idx];
1090 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1093 if (chan->beacon_found)
1096 chan->beacon_found = true;
1098 if (wiphy->disable_beacon_hints)
1101 chan_before.center_freq = chan->center_freq;
1102 chan_before.flags = chan->flags;
1104 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
1105 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
1106 channel_changed = true;
1109 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
1110 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
1111 channel_changed = true;
1114 if (channel_changed)
1115 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1119 * Called when a scan on a wiphy finds a beacon on
1122 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1123 struct reg_beacon *reg_beacon)
1126 struct ieee80211_supported_band *sband;
1128 assert_cfg80211_lock();
1130 if (!wiphy->bands[reg_beacon->chan.band])
1133 sband = wiphy->bands[reg_beacon->chan.band];
1135 for (i = 0; i < sband->n_channels; i++)
1136 handle_reg_beacon(wiphy, i, reg_beacon);
1140 * Called upon reg changes or a new wiphy is added
1142 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1145 struct ieee80211_supported_band *sband;
1146 struct reg_beacon *reg_beacon;
1148 assert_cfg80211_lock();
1150 if (list_empty(®_beacon_list))
1153 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1154 if (!wiphy->bands[reg_beacon->chan.band])
1156 sband = wiphy->bands[reg_beacon->chan.band];
1157 for (i = 0; i < sband->n_channels; i++)
1158 handle_reg_beacon(wiphy, i, reg_beacon);
1162 static bool reg_is_world_roaming(struct wiphy *wiphy)
1164 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1165 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1168 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1169 wiphy->custom_regulatory)
1174 /* Reap the advantages of previously found beacons */
1175 static void reg_process_beacons(struct wiphy *wiphy)
1178 * Means we are just firing up cfg80211, so no beacons would
1179 * have been processed yet.
1183 if (!reg_is_world_roaming(wiphy))
1185 wiphy_update_beacon_reg(wiphy);
1188 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1192 if (chan->flags & IEEE80211_CHAN_DISABLED)
1194 /* This would happen when regulatory rules disallow HT40 completely */
1195 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1200 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1201 enum ieee80211_band band,
1202 unsigned int chan_idx)
1204 struct ieee80211_supported_band *sband;
1205 struct ieee80211_channel *channel;
1206 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1209 assert_cfg80211_lock();
1211 sband = wiphy->bands[band];
1212 BUG_ON(chan_idx >= sband->n_channels);
1213 channel = &sband->channels[chan_idx];
1215 if (is_ht40_not_allowed(channel)) {
1216 channel->flags |= IEEE80211_CHAN_NO_HT40;
1221 * We need to ensure the extension channels exist to
1222 * be able to use HT40- or HT40+, this finds them (or not)
1224 for (i = 0; i < sband->n_channels; i++) {
1225 struct ieee80211_channel *c = &sband->channels[i];
1226 if (c->center_freq == (channel->center_freq - 20))
1228 if (c->center_freq == (channel->center_freq + 20))
1233 * Please note that this assumes target bandwidth is 20 MHz,
1234 * if that ever changes we also need to change the below logic
1235 * to include that as well.
1237 if (is_ht40_not_allowed(channel_before))
1238 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1240 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1242 if (is_ht40_not_allowed(channel_after))
1243 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1245 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1248 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1249 enum ieee80211_band band)
1252 struct ieee80211_supported_band *sband;
1254 BUG_ON(!wiphy->bands[band]);
1255 sband = wiphy->bands[band];
1257 for (i = 0; i < sband->n_channels; i++)
1258 reg_process_ht_flags_channel(wiphy, band, i);
1261 static void reg_process_ht_flags(struct wiphy *wiphy)
1263 enum ieee80211_band band;
1268 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1269 if (wiphy->bands[band])
1270 reg_process_ht_flags_band(wiphy, band);
1275 void wiphy_update_regulatory(struct wiphy *wiphy,
1276 enum nl80211_reg_initiator initiator)
1278 enum ieee80211_band band;
1280 if (ignore_reg_update(wiphy, initiator))
1282 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1283 if (wiphy->bands[band])
1284 handle_band(wiphy, band);
1287 reg_process_beacons(wiphy);
1288 reg_process_ht_flags(wiphy);
1289 if (wiphy->reg_notifier)
1290 wiphy->reg_notifier(wiphy, last_request);
1293 static void handle_channel_custom(struct wiphy *wiphy,
1294 enum ieee80211_band band,
1295 unsigned int chan_idx,
1296 const struct ieee80211_regdomain *regd)
1299 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1301 const struct ieee80211_reg_rule *reg_rule = NULL;
1302 const struct ieee80211_power_rule *power_rule = NULL;
1303 const struct ieee80211_freq_range *freq_range = NULL;
1304 struct ieee80211_supported_band *sband;
1305 struct ieee80211_channel *chan;
1309 sband = wiphy->bands[band];
1310 BUG_ON(chan_idx >= sband->n_channels);
1311 chan = &sband->channels[chan_idx];
1313 r = freq_reg_info_regd(wiphy,
1314 MHZ_TO_KHZ(chan->center_freq),
1320 chan->flags = IEEE80211_CHAN_DISABLED;
1324 power_rule = ®_rule->power_rule;
1325 freq_range = ®_rule->freq_range;
1327 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1328 bw_flags = IEEE80211_CHAN_NO_HT40;
1330 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1331 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1332 chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz);
1333 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1336 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1337 const struct ieee80211_regdomain *regd)
1340 struct ieee80211_supported_band *sband;
1342 BUG_ON(!wiphy->bands[band]);
1343 sband = wiphy->bands[band];
1345 for (i = 0; i < sband->n_channels; i++)
1346 handle_channel_custom(wiphy, band, i, regd);
1349 /* Used by drivers prior to wiphy registration */
1350 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1351 const struct ieee80211_regdomain *regd)
1353 enum ieee80211_band band;
1354 unsigned int bands_set = 0;
1356 mutex_lock(®_mutex);
1357 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1358 if (!wiphy->bands[band])
1360 handle_band_custom(wiphy, band, regd);
1363 mutex_unlock(®_mutex);
1366 * no point in calling this if it won't have any effect
1367 * on your device's supportd bands.
1369 WARN_ON(!bands_set);
1371 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1373 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
1374 const struct ieee80211_regdomain *src_regd)
1376 struct ieee80211_regdomain *regd;
1377 int size_of_regd = 0;
1380 size_of_regd = sizeof(struct ieee80211_regdomain) +
1381 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
1383 regd = kzalloc(size_of_regd, GFP_KERNEL);
1387 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
1389 for (i = 0; i < src_regd->n_reg_rules; i++)
1390 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
1391 sizeof(struct ieee80211_reg_rule));
1398 * Return value which can be used by ignore_request() to indicate
1399 * it has been determined we should intersect two regulatory domains
1401 #define REG_INTERSECT 1
1403 /* This has the logic which determines when a new request
1404 * should be ignored. */
1405 static int ignore_request(struct wiphy *wiphy,
1406 struct regulatory_request *pending_request)
1408 struct wiphy *last_wiphy = NULL;
1410 assert_cfg80211_lock();
1412 /* All initial requests are respected */
1416 switch (pending_request->initiator) {
1417 case NL80211_REGDOM_SET_BY_CORE:
1419 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1421 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1423 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1425 if (last_request->initiator ==
1426 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1427 if (last_wiphy != wiphy) {
1429 * Two cards with two APs claiming different
1430 * different Country IE alpha2s. We could
1431 * intersect them, but that seems unlikely
1432 * to be correct. Reject second one for now.
1434 if (regdom_changes(pending_request->alpha2))
1439 * Two consecutive Country IE hints on the same wiphy.
1440 * This should be picked up early by the driver/stack
1442 if (WARN_ON(regdom_changes(pending_request->alpha2)))
1446 return REG_INTERSECT;
1447 case NL80211_REGDOM_SET_BY_DRIVER:
1448 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1449 if (is_old_static_regdom(cfg80211_regdomain))
1451 if (regdom_changes(pending_request->alpha2))
1457 * This would happen if you unplug and plug your card
1458 * back in or if you add a new device for which the previously
1459 * loaded card also agrees on the regulatory domain.
1461 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1462 !regdom_changes(pending_request->alpha2))
1465 return REG_INTERSECT;
1466 case NL80211_REGDOM_SET_BY_USER:
1467 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1468 return REG_INTERSECT;
1470 * If the user knows better the user should set the regdom
1471 * to their country before the IE is picked up
1473 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1474 last_request->intersect)
1477 * Process user requests only after previous user/driver/core
1478 * requests have been processed
1480 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1481 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1482 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1483 if (regdom_changes(last_request->alpha2))
1487 if (!is_old_static_regdom(cfg80211_regdomain) &&
1488 !regdom_changes(pending_request->alpha2))
1498 * __regulatory_hint - hint to the wireless core a regulatory domain
1499 * @wiphy: if the hint comes from country information from an AP, this
1500 * is required to be set to the wiphy that received the information
1501 * @pending_request: the regulatory request currently being processed
1503 * The Wireless subsystem can use this function to hint to the wireless core
1504 * what it believes should be the current regulatory domain.
1506 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1507 * already been set or other standard error codes.
1509 * Caller must hold &cfg80211_mutex and ®_mutex
1511 static int __regulatory_hint(struct wiphy *wiphy,
1512 struct regulatory_request *pending_request)
1514 bool intersect = false;
1517 assert_cfg80211_lock();
1519 r = ignore_request(wiphy, pending_request);
1521 if (r == REG_INTERSECT) {
1522 if (pending_request->initiator ==
1523 NL80211_REGDOM_SET_BY_DRIVER) {
1524 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1526 kfree(pending_request);
1533 * If the regulatory domain being requested by the
1534 * driver has already been set just copy it to the
1537 if (r == -EALREADY &&
1538 pending_request->initiator ==
1539 NL80211_REGDOM_SET_BY_DRIVER) {
1540 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1542 kfree(pending_request);
1548 kfree(pending_request);
1553 kfree(last_request);
1555 last_request = pending_request;
1556 last_request->intersect = intersect;
1558 pending_request = NULL;
1560 /* When r == REG_INTERSECT we do need to call CRDA */
1563 * Since CRDA will not be called in this case as we already
1564 * have applied the requested regulatory domain before we just
1565 * inform userspace we have processed the request
1568 nl80211_send_reg_change_event(last_request);
1572 return call_crda(last_request->alpha2);
1575 /* This processes *all* regulatory hints */
1576 static void reg_process_hint(struct regulatory_request *reg_request)
1579 struct wiphy *wiphy = NULL;
1581 BUG_ON(!reg_request->alpha2);
1583 mutex_lock(&cfg80211_mutex);
1584 mutex_lock(®_mutex);
1586 if (wiphy_idx_valid(reg_request->wiphy_idx))
1587 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1589 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1595 r = __regulatory_hint(wiphy, reg_request);
1596 /* This is required so that the orig_* parameters are saved */
1597 if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
1598 wiphy_update_regulatory(wiphy, reg_request->initiator);
1600 mutex_unlock(®_mutex);
1601 mutex_unlock(&cfg80211_mutex);
1604 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
1605 static void reg_process_pending_hints(void)
1607 struct regulatory_request *reg_request;
1609 spin_lock(®_requests_lock);
1610 while (!list_empty(®_requests_list)) {
1611 reg_request = list_first_entry(®_requests_list,
1612 struct regulatory_request,
1614 list_del_init(®_request->list);
1616 spin_unlock(®_requests_lock);
1617 reg_process_hint(reg_request);
1618 spin_lock(®_requests_lock);
1620 spin_unlock(®_requests_lock);
1623 /* Processes beacon hints -- this has nothing to do with country IEs */
1624 static void reg_process_pending_beacon_hints(void)
1626 struct cfg80211_registered_device *rdev;
1627 struct reg_beacon *pending_beacon, *tmp;
1630 * No need to hold the reg_mutex here as we just touch wiphys
1631 * and do not read or access regulatory variables.
1633 mutex_lock(&cfg80211_mutex);
1635 /* This goes through the _pending_ beacon list */
1636 spin_lock_bh(®_pending_beacons_lock);
1638 if (list_empty(®_pending_beacons)) {
1639 spin_unlock_bh(®_pending_beacons_lock);
1643 list_for_each_entry_safe(pending_beacon, tmp,
1644 ®_pending_beacons, list) {
1646 list_del_init(&pending_beacon->list);
1648 /* Applies the beacon hint to current wiphys */
1649 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1650 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1652 /* Remembers the beacon hint for new wiphys or reg changes */
1653 list_add_tail(&pending_beacon->list, ®_beacon_list);
1656 spin_unlock_bh(®_pending_beacons_lock);
1658 mutex_unlock(&cfg80211_mutex);
1661 static void reg_todo(struct work_struct *work)
1663 reg_process_pending_hints();
1664 reg_process_pending_beacon_hints();
1667 static DECLARE_WORK(reg_work, reg_todo);
1669 static void queue_regulatory_request(struct regulatory_request *request)
1671 spin_lock(®_requests_lock);
1672 list_add_tail(&request->list, ®_requests_list);
1673 spin_unlock(®_requests_lock);
1675 schedule_work(®_work);
1678 /* Core regulatory hint -- happens once during cfg80211_init() */
1679 static int regulatory_hint_core(const char *alpha2)
1681 struct regulatory_request *request;
1683 BUG_ON(last_request);
1685 request = kzalloc(sizeof(struct regulatory_request),
1690 request->alpha2[0] = alpha2[0];
1691 request->alpha2[1] = alpha2[1];
1692 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1694 queue_regulatory_request(request);
1697 * This ensures last_request is populated once modules
1698 * come swinging in and calling regulatory hints and
1699 * wiphy_apply_custom_regulatory().
1701 flush_scheduled_work();
1707 int regulatory_hint_user(const char *alpha2)
1709 struct regulatory_request *request;
1713 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1717 request->wiphy_idx = WIPHY_IDX_STALE;
1718 request->alpha2[0] = alpha2[0];
1719 request->alpha2[1] = alpha2[1];
1720 request->initiator = NL80211_REGDOM_SET_BY_USER,
1722 queue_regulatory_request(request);
1728 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1730 struct regulatory_request *request;
1735 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1739 request->wiphy_idx = get_wiphy_idx(wiphy);
1741 /* Must have registered wiphy first */
1742 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1744 request->alpha2[0] = alpha2[0];
1745 request->alpha2[1] = alpha2[1];
1746 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1748 queue_regulatory_request(request);
1752 EXPORT_SYMBOL(regulatory_hint);
1754 /* Caller must hold reg_mutex */
1755 static bool reg_same_country_ie_hint(struct wiphy *wiphy,
1756 u32 country_ie_checksum)
1758 struct wiphy *request_wiphy;
1762 if (unlikely(last_request->initiator !=
1763 NL80211_REGDOM_SET_BY_COUNTRY_IE))
1766 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1771 if (likely(request_wiphy != wiphy))
1772 return !country_ie_integrity_changes(country_ie_checksum);
1774 * We should not have let these through at this point, they
1775 * should have been picked up earlier by the first alpha2 check
1778 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
1784 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1785 * therefore cannot iterate over the rdev list here.
1787 void regulatory_hint_11d(struct wiphy *wiphy,
1791 struct ieee80211_regdomain *rd = NULL;
1794 enum environment_cap env = ENVIRON_ANY;
1795 struct regulatory_request *request;
1797 mutex_lock(®_mutex);
1799 if (unlikely(!last_request))
1802 /* IE len must be evenly divisible by 2 */
1803 if (country_ie_len & 0x01)
1806 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1810 * Pending country IE processing, this can happen after we
1811 * call CRDA and wait for a response if a beacon was received before
1812 * we were able to process the last regulatory_hint_11d() call
1814 if (country_ie_regdomain)
1817 alpha2[0] = country_ie[0];
1818 alpha2[1] = country_ie[1];
1820 if (country_ie[2] == 'I')
1821 env = ENVIRON_INDOOR;
1822 else if (country_ie[2] == 'O')
1823 env = ENVIRON_OUTDOOR;
1826 * We will run this only upon a successful connection on cfg80211.
1827 * We leave conflict resolution to the workqueue, where can hold
1830 if (likely(last_request->initiator ==
1831 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1832 wiphy_idx_valid(last_request->wiphy_idx)))
1835 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
1840 * This will not happen right now but we leave it here for the
1841 * the future when we want to add suspend/resume support and having
1842 * the user move to another country after doing so, or having the user
1843 * move to another AP. Right now we just trust the first AP.
1845 * If we hit this before we add this support we want to be informed of
1846 * it as it would indicate a mistake in the current design
1848 if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))
1851 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1856 * We keep this around for when CRDA comes back with a response so
1857 * we can intersect with that
1859 country_ie_regdomain = rd;
1861 request->wiphy_idx = get_wiphy_idx(wiphy);
1862 request->alpha2[0] = rd->alpha2[0];
1863 request->alpha2[1] = rd->alpha2[1];
1864 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1865 request->country_ie_checksum = checksum;
1866 request->country_ie_env = env;
1868 mutex_unlock(®_mutex);
1870 queue_regulatory_request(request);
1877 mutex_unlock(®_mutex);
1880 static bool freq_is_chan_12_13_14(u16 freq)
1882 if (freq == ieee80211_channel_to_frequency(12) ||
1883 freq == ieee80211_channel_to_frequency(13) ||
1884 freq == ieee80211_channel_to_frequency(14))
1889 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1890 struct ieee80211_channel *beacon_chan,
1893 struct reg_beacon *reg_beacon;
1895 if (likely((beacon_chan->beacon_found ||
1896 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1897 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1898 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1901 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1905 #ifdef CONFIG_CFG80211_REG_DEBUG
1906 printk(KERN_DEBUG "cfg80211: Found new beacon on "
1907 "frequency: %d MHz (Ch %d) on %s\n",
1908 beacon_chan->center_freq,
1909 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1912 memcpy(®_beacon->chan, beacon_chan,
1913 sizeof(struct ieee80211_channel));
1917 * Since we can be called from BH or and non-BH context
1918 * we must use spin_lock_bh()
1920 spin_lock_bh(®_pending_beacons_lock);
1921 list_add_tail(®_beacon->list, ®_pending_beacons);
1922 spin_unlock_bh(®_pending_beacons_lock);
1924 schedule_work(®_work);
1929 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1932 const struct ieee80211_reg_rule *reg_rule = NULL;
1933 const struct ieee80211_freq_range *freq_range = NULL;
1934 const struct ieee80211_power_rule *power_rule = NULL;
1936 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
1937 "(max_antenna_gain, max_eirp)\n");
1939 for (i = 0; i < rd->n_reg_rules; i++) {
1940 reg_rule = &rd->reg_rules[i];
1941 freq_range = ®_rule->freq_range;
1942 power_rule = ®_rule->power_rule;
1945 * There may not be documentation for max antenna gain
1946 * in certain regions
1948 if (power_rule->max_antenna_gain)
1949 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1950 "(%d mBi, %d mBm)\n",
1951 freq_range->start_freq_khz,
1952 freq_range->end_freq_khz,
1953 freq_range->max_bandwidth_khz,
1954 power_rule->max_antenna_gain,
1955 power_rule->max_eirp);
1957 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1959 freq_range->start_freq_khz,
1960 freq_range->end_freq_khz,
1961 freq_range->max_bandwidth_khz,
1962 power_rule->max_eirp);
1966 static void print_regdomain(const struct ieee80211_regdomain *rd)
1969 if (is_intersected_alpha2(rd->alpha2)) {
1971 if (last_request->initiator ==
1972 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1973 struct cfg80211_registered_device *rdev;
1974 rdev = cfg80211_rdev_by_wiphy_idx(
1975 last_request->wiphy_idx);
1977 printk(KERN_INFO "cfg80211: Current regulatory "
1978 "domain updated by AP to: %c%c\n",
1979 rdev->country_ie_alpha2[0],
1980 rdev->country_ie_alpha2[1]);
1982 printk(KERN_INFO "cfg80211: Current regulatory "
1983 "domain intersected: \n");
1985 printk(KERN_INFO "cfg80211: Current regulatory "
1986 "domain intersected: \n");
1987 } else if (is_world_regdom(rd->alpha2))
1988 printk(KERN_INFO "cfg80211: World regulatory "
1989 "domain updated:\n");
1991 if (is_unknown_alpha2(rd->alpha2))
1992 printk(KERN_INFO "cfg80211: Regulatory domain "
1993 "changed to driver built-in settings "
1994 "(unknown country)\n");
1996 printk(KERN_INFO "cfg80211: Regulatory domain "
1997 "changed to country: %c%c\n",
1998 rd->alpha2[0], rd->alpha2[1]);
2003 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2005 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
2006 rd->alpha2[0], rd->alpha2[1]);
2010 #ifdef CONFIG_CFG80211_REG_DEBUG
2011 static void reg_country_ie_process_debug(
2012 const struct ieee80211_regdomain *rd,
2013 const struct ieee80211_regdomain *country_ie_regdomain,
2014 const struct ieee80211_regdomain *intersected_rd)
2016 printk(KERN_DEBUG "cfg80211: Received country IE:\n");
2017 print_regdomain_info(country_ie_regdomain);
2018 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
2019 print_regdomain_info(rd);
2020 if (intersected_rd) {
2021 printk(KERN_DEBUG "cfg80211: We intersect both of these "
2023 print_regdomain_info(intersected_rd);
2026 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
2029 static inline void reg_country_ie_process_debug(
2030 const struct ieee80211_regdomain *rd,
2031 const struct ieee80211_regdomain *country_ie_regdomain,
2032 const struct ieee80211_regdomain *intersected_rd)
2037 /* Takes ownership of rd only if it doesn't fail */
2038 static int __set_regdom(const struct ieee80211_regdomain *rd)
2040 const struct ieee80211_regdomain *intersected_rd = NULL;
2041 struct cfg80211_registered_device *rdev = NULL;
2042 struct wiphy *request_wiphy;
2043 /* Some basic sanity checks first */
2045 if (is_world_regdom(rd->alpha2)) {
2046 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2048 update_world_regdomain(rd);
2052 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2053 !is_unknown_alpha2(rd->alpha2))
2060 * Lets only bother proceeding on the same alpha2 if the current
2061 * rd is non static (it means CRDA was present and was used last)
2062 * and the pending request came in from a country IE
2064 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2066 * If someone else asked us to change the rd lets only bother
2067 * checking if the alpha2 changes if CRDA was already called
2069 if (!is_old_static_regdom(cfg80211_regdomain) &&
2070 !regdom_changes(rd->alpha2))
2075 * Now lets set the regulatory domain, update all driver channels
2076 * and finally inform them of what we have done, in case they want
2077 * to review or adjust their own settings based on their own
2078 * internal EEPROM data
2081 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2084 if (!is_valid_rd(rd)) {
2085 printk(KERN_ERR "cfg80211: Invalid "
2086 "regulatory domain detected:\n");
2087 print_regdomain_info(rd);
2091 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2093 if (!last_request->intersect) {
2096 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
2098 cfg80211_regdomain = rd;
2103 * For a driver hint, lets copy the regulatory domain the
2104 * driver wanted to the wiphy to deal with conflicts
2108 * Userspace could have sent two replies with only
2109 * one kernel request.
2111 if (request_wiphy->regd)
2114 r = reg_copy_regd(&request_wiphy->regd, rd);
2119 cfg80211_regdomain = rd;
2123 /* Intersection requires a bit more work */
2125 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2127 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2128 if (!intersected_rd)
2132 * We can trash what CRDA provided now.
2133 * However if a driver requested this specific regulatory
2134 * domain we keep it for its private use
2136 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
2137 request_wiphy->regd = rd;
2144 cfg80211_regdomain = intersected_rd;
2150 * Country IE requests are handled a bit differently, we intersect
2151 * the country IE rd with what CRDA believes that country should have
2155 * Userspace could have sent two replies with only
2156 * one kernel request. By the second reply we would have
2157 * already processed and consumed the country_ie_regdomain.
2159 if (!country_ie_regdomain)
2161 BUG_ON(rd == country_ie_regdomain);
2164 * Intersect what CRDA returned and our what we
2165 * had built from the Country IE received
2168 intersected_rd = regdom_intersect(rd, country_ie_regdomain);
2170 reg_country_ie_process_debug(rd,
2171 country_ie_regdomain,
2174 kfree(country_ie_regdomain);
2175 country_ie_regdomain = NULL;
2177 if (!intersected_rd)
2180 rdev = wiphy_to_dev(request_wiphy);
2182 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2183 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2184 rdev->env = last_request->country_ie_env;
2186 BUG_ON(intersected_rd == rd);
2192 cfg80211_regdomain = intersected_rd;
2199 * Use this call to set the current regulatory domain. Conflicts with
2200 * multiple drivers can be ironed out later. Caller must've already
2201 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2203 int set_regdom(const struct ieee80211_regdomain *rd)
2207 assert_cfg80211_lock();
2209 mutex_lock(®_mutex);
2211 /* Note that this doesn't update the wiphys, this is done below */
2212 r = __set_regdom(rd);
2215 mutex_unlock(®_mutex);
2219 /* This would make this whole thing pointless */
2220 if (!last_request->intersect)
2221 BUG_ON(rd != cfg80211_regdomain);
2223 /* update all wiphys now with the new established regulatory domain */
2224 update_all_wiphy_regulatory(last_request->initiator);
2226 print_regdomain(cfg80211_regdomain);
2228 nl80211_send_reg_change_event(last_request);
2230 mutex_unlock(®_mutex);
2235 /* Caller must hold cfg80211_mutex */
2236 void reg_device_remove(struct wiphy *wiphy)
2238 struct wiphy *request_wiphy = NULL;
2240 assert_cfg80211_lock();
2242 mutex_lock(®_mutex);
2247 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2249 if (!request_wiphy || request_wiphy != wiphy)
2252 last_request->wiphy_idx = WIPHY_IDX_STALE;
2253 last_request->country_ie_env = ENVIRON_ANY;
2255 mutex_unlock(®_mutex);
2258 int regulatory_init(void)
2262 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2263 if (IS_ERR(reg_pdev))
2264 return PTR_ERR(reg_pdev);
2266 spin_lock_init(®_requests_lock);
2267 spin_lock_init(®_pending_beacons_lock);
2269 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
2270 cfg80211_regdomain = static_regdom(ieee80211_regdom);
2272 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
2273 print_regdomain_info(cfg80211_regdomain);
2275 cfg80211_regdomain = cfg80211_world_regdom;
2278 /* We always try to get an update for the static regdomain */
2279 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2284 * N.B. kobject_uevent_env() can fail mainly for when we're out
2285 * memory which is handled and propagated appropriately above
2286 * but it can also fail during a netlink_broadcast() or during
2287 * early boot for call_usermodehelper(). For now treat these
2288 * errors as non-fatal.
2290 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
2291 "to call CRDA during init");
2292 #ifdef CONFIG_CFG80211_REG_DEBUG
2293 /* We want to find out exactly why when debugging */
2299 * Finally, if the user set the module parameter treat it
2302 if (!is_world_regdom(ieee80211_regdom))
2303 regulatory_hint_user(ieee80211_regdom);
2308 void regulatory_exit(void)
2310 struct regulatory_request *reg_request, *tmp;
2311 struct reg_beacon *reg_beacon, *btmp;
2313 cancel_work_sync(®_work);
2315 mutex_lock(&cfg80211_mutex);
2316 mutex_lock(®_mutex);
2320 kfree(country_ie_regdomain);
2321 country_ie_regdomain = NULL;
2323 kfree(last_request);
2325 platform_device_unregister(reg_pdev);
2327 spin_lock_bh(®_pending_beacons_lock);
2328 if (!list_empty(®_pending_beacons)) {
2329 list_for_each_entry_safe(reg_beacon, btmp,
2330 ®_pending_beacons, list) {
2331 list_del(®_beacon->list);
2335 spin_unlock_bh(®_pending_beacons_lock);
2337 if (!list_empty(®_beacon_list)) {
2338 list_for_each_entry_safe(reg_beacon, btmp,
2339 ®_beacon_list, list) {
2340 list_del(®_beacon->list);
2345 spin_lock(®_requests_lock);
2346 if (!list_empty(®_requests_list)) {
2347 list_for_each_entry_safe(reg_request, tmp,
2348 ®_requests_list, list) {
2349 list_del(®_request->list);
2353 spin_unlock(®_requests_lock);
2355 mutex_unlock(®_mutex);
2356 mutex_unlock(&cfg80211_mutex);