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/wireless.h>
41 #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;
51 /* Keep the ordering from large to small */
52 static u32 supported_bandwidths[] = {
58 * Central wireless core regulatory domains, we only need two,
59 * the current one and a world regulatory domain in case we have no
60 * information to give us an alpha2
62 const struct ieee80211_regdomain *cfg80211_regdomain;
65 * We use this as a place for the rd structure built from the
66 * last parsed country IE to rest until CRDA gets back to us with
67 * what it thinks should apply for the same country
69 static const struct ieee80211_regdomain *country_ie_regdomain;
71 /* Used to queue up regulatory hints */
72 static LIST_HEAD(reg_requests_list);
73 static spinlock_t reg_requests_lock;
75 /* Used to queue up beacon hints for review */
76 static LIST_HEAD(reg_pending_beacons);
77 static spinlock_t reg_pending_beacons_lock;
79 /* Used to keep track of processed beacon hints */
80 static LIST_HEAD(reg_beacon_list);
83 struct list_head list;
84 struct ieee80211_channel chan;
87 /* We keep a static world regulatory domain in case of the absence of CRDA */
88 static const struct ieee80211_regdomain world_regdom = {
92 /* IEEE 802.11b/g, channels 1..11 */
93 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
94 /* IEEE 802.11a, channel 36..48 */
95 REG_RULE(5180-10, 5240+10, 40, 6, 23,
96 NL80211_RRF_PASSIVE_SCAN |
99 /* NB: 5260 MHz - 5700 MHz requies DFS */
101 /* IEEE 802.11a, channel 149..165 */
102 REG_RULE(5745-10, 5825+10, 40, 6, 23,
103 NL80211_RRF_PASSIVE_SCAN |
104 NL80211_RRF_NO_IBSS),
108 static const struct ieee80211_regdomain *cfg80211_world_regdom =
111 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
112 static char *ieee80211_regdom = "US";
113 module_param(ieee80211_regdom, charp, 0444);
114 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
117 * We assume 40 MHz bandwidth for the old regulatory work.
118 * We make emphasis we are using the exact same frequencies
122 static const struct ieee80211_regdomain us_regdom = {
126 /* IEEE 802.11b/g, channels 1..11 */
127 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
128 /* IEEE 802.11a, channel 36 */
129 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
130 /* IEEE 802.11a, channel 40 */
131 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
132 /* IEEE 802.11a, channel 44 */
133 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
134 /* IEEE 802.11a, channels 48..64 */
135 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
136 /* IEEE 802.11a, channels 149..165, outdoor */
137 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
141 static const struct ieee80211_regdomain jp_regdom = {
145 /* IEEE 802.11b/g, channels 1..14 */
146 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
147 /* IEEE 802.11a, channels 34..48 */
148 REG_RULE(5170-10, 5240+10, 40, 6, 20,
149 NL80211_RRF_PASSIVE_SCAN),
150 /* IEEE 802.11a, channels 52..64 */
151 REG_RULE(5260-10, 5320+10, 40, 6, 20,
152 NL80211_RRF_NO_IBSS |
157 static const struct ieee80211_regdomain eu_regdom = {
160 * This alpha2 is bogus, we leave it here just for stupid
161 * backward compatibility
165 /* IEEE 802.11b/g, channels 1..13 */
166 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
167 /* IEEE 802.11a, channel 36 */
168 REG_RULE(5180-10, 5180+10, 40, 6, 23,
169 NL80211_RRF_PASSIVE_SCAN),
170 /* IEEE 802.11a, channel 40 */
171 REG_RULE(5200-10, 5200+10, 40, 6, 23,
172 NL80211_RRF_PASSIVE_SCAN),
173 /* IEEE 802.11a, channel 44 */
174 REG_RULE(5220-10, 5220+10, 40, 6, 23,
175 NL80211_RRF_PASSIVE_SCAN),
176 /* IEEE 802.11a, channels 48..64 */
177 REG_RULE(5240-10, 5320+10, 40, 6, 20,
178 NL80211_RRF_NO_IBSS |
180 /* IEEE 802.11a, channels 100..140 */
181 REG_RULE(5500-10, 5700+10, 40, 6, 30,
182 NL80211_RRF_NO_IBSS |
187 static const struct ieee80211_regdomain *static_regdom(char *alpha2)
189 if (alpha2[0] == 'U' && alpha2[1] == 'S')
191 if (alpha2[0] == 'J' && alpha2[1] == 'P')
193 if (alpha2[0] == 'E' && alpha2[1] == 'U')
195 /* Default, as per the old rules */
199 static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
201 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
206 static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
212 static void reset_regdomains(void)
214 /* avoid freeing static information or freeing something twice */
215 if (cfg80211_regdomain == cfg80211_world_regdom)
216 cfg80211_regdomain = NULL;
217 if (cfg80211_world_regdom == &world_regdom)
218 cfg80211_world_regdom = NULL;
219 if (cfg80211_regdomain == &world_regdom)
220 cfg80211_regdomain = NULL;
221 if (is_old_static_regdom(cfg80211_regdomain))
222 cfg80211_regdomain = NULL;
224 kfree(cfg80211_regdomain);
225 kfree(cfg80211_world_regdom);
227 cfg80211_world_regdom = &world_regdom;
228 cfg80211_regdomain = NULL;
232 * Dynamic world regulatory domain requested by the wireless
233 * core upon initialization
235 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
237 BUG_ON(!last_request);
241 cfg80211_world_regdom = rd;
242 cfg80211_regdomain = rd;
245 bool is_world_regdom(const char *alpha2)
249 if (alpha2[0] == '0' && alpha2[1] == '0')
254 static bool is_alpha2_set(const char *alpha2)
258 if (alpha2[0] != 0 && alpha2[1] != 0)
263 static bool is_alpha_upper(char letter)
266 if (letter >= 65 && letter <= 90)
271 static bool is_unknown_alpha2(const char *alpha2)
276 * Special case where regulatory domain was built by driver
277 * but a specific alpha2 cannot be determined
279 if (alpha2[0] == '9' && alpha2[1] == '9')
284 static bool is_intersected_alpha2(const char *alpha2)
289 * Special case where regulatory domain is the
290 * result of an intersection between two regulatory domain
293 if (alpha2[0] == '9' && alpha2[1] == '8')
298 static bool is_an_alpha2(const char *alpha2)
302 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
307 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
309 if (!alpha2_x || !alpha2_y)
311 if (alpha2_x[0] == alpha2_y[0] &&
312 alpha2_x[1] == alpha2_y[1])
317 static bool regdom_changes(const char *alpha2)
319 assert_cfg80211_lock();
321 if (!cfg80211_regdomain)
323 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
329 * country_ie_integrity_changes - tells us if the country IE has changed
330 * @checksum: checksum of country IE of fields we are interested in
332 * If the country IE has not changed you can ignore it safely. This is
333 * useful to determine if two devices are seeing two different country IEs
334 * even on the same alpha2. Note that this will return false if no IE has
335 * been set on the wireless core yet.
337 static bool country_ie_integrity_changes(u32 checksum)
339 /* If no IE has been set then the checksum doesn't change */
340 if (unlikely(!last_request->country_ie_checksum))
342 if (unlikely(last_request->country_ie_checksum != checksum))
348 * This lets us keep regulatory code which is updated on a regulatory
349 * basis in userspace.
351 static int call_crda(const char *alpha2)
353 char country_env[9 + 2] = "COUNTRY=";
359 if (!is_world_regdom((char *) alpha2))
360 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
361 alpha2[0], alpha2[1]);
363 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
364 "regulatory domain\n");
366 country_env[8] = alpha2[0];
367 country_env[9] = alpha2[1];
369 return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp);
372 /* Used by nl80211 before kmalloc'ing our regulatory domain */
373 bool reg_is_valid_request(const char *alpha2)
378 return alpha2_equal(last_request->alpha2, alpha2);
381 /* Sanity check on a regulatory rule */
382 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
384 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
387 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
390 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
393 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
395 if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff)
401 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
403 const struct ieee80211_reg_rule *reg_rule = NULL;
406 if (!rd->n_reg_rules)
409 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
412 for (i = 0; i < rd->n_reg_rules; i++) {
413 reg_rule = &rd->reg_rules[i];
414 if (!is_valid_reg_rule(reg_rule))
421 /* Returns value in KHz */
422 static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
426 for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
427 u32 start_freq_khz = freq - supported_bandwidths[i]/2;
428 u32 end_freq_khz = freq + supported_bandwidths[i]/2;
429 if (start_freq_khz >= freq_range->start_freq_khz &&
430 end_freq_khz <= freq_range->end_freq_khz)
431 return supported_bandwidths[i];
437 * freq_in_rule_band - tells us if a frequency is in a frequency band
438 * @freq_range: frequency rule we want to query
439 * @freq_khz: frequency we are inquiring about
441 * This lets us know if a specific frequency rule is or is not relevant to
442 * a specific frequency's band. Bands are device specific and artificial
443 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
444 * safe for now to assume that a frequency rule should not be part of a
445 * frequency's band if the start freq or end freq are off by more than 2 GHz.
446 * This resolution can be lowered and should be considered as we add
447 * regulatory rule support for other "bands".
449 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
452 #define ONE_GHZ_IN_KHZ 1000000
453 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
455 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
458 #undef ONE_GHZ_IN_KHZ
462 * Converts a country IE to a regulatory domain. A regulatory domain
463 * structure has a lot of information which the IE doesn't yet have,
464 * so for the other values we use upper max values as we will intersect
465 * with our userspace regulatory agent to get lower bounds.
467 static struct ieee80211_regdomain *country_ie_2_rd(
472 struct ieee80211_regdomain *rd = NULL;
476 u32 num_rules = 0, size_of_regd = 0;
477 u8 *triplets_start = NULL;
478 u8 len_at_triplet = 0;
479 /* the last channel we have registered in a subband (triplet) */
480 int last_sub_max_channel = 0;
482 *checksum = 0xDEADBEEF;
484 /* Country IE requirements */
485 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
486 country_ie_len & 0x01);
488 alpha2[0] = country_ie[0];
489 alpha2[1] = country_ie[1];
492 * Third octet can be:
496 * anything else we assume is no restrictions
498 if (country_ie[2] == 'I')
499 flags = NL80211_RRF_NO_OUTDOOR;
500 else if (country_ie[2] == 'O')
501 flags = NL80211_RRF_NO_INDOOR;
506 triplets_start = country_ie;
507 len_at_triplet = country_ie_len;
509 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
512 * We need to build a reg rule for each triplet, but first we must
513 * calculate the number of reg rules we will need. We will need one
514 * for each channel subband
516 while (country_ie_len >= 3) {
518 struct ieee80211_country_ie_triplet *triplet =
519 (struct ieee80211_country_ie_triplet *) country_ie;
520 int cur_sub_max_channel = 0, cur_channel = 0;
522 if (triplet->ext.reg_extension_id >=
523 IEEE80211_COUNTRY_EXTENSION_ID) {
530 if (triplet->chans.first_channel <= 14)
531 end_channel = triplet->chans.first_channel +
532 triplet->chans.num_channels;
535 * 5 GHz -- For example in country IEs if the first
536 * channel given is 36 and the number of channels is 4
537 * then the individual channel numbers defined for the
538 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
539 * and not 36, 37, 38, 39.
541 * See: http://tinyurl.com/11d-clarification
543 end_channel = triplet->chans.first_channel +
544 (4 * (triplet->chans.num_channels - 1));
546 cur_channel = triplet->chans.first_channel;
547 cur_sub_max_channel = end_channel;
549 /* Basic sanity check */
550 if (cur_sub_max_channel < cur_channel)
554 * Do not allow overlapping channels. Also channels
555 * passed in each subband must be monotonically
558 if (last_sub_max_channel) {
559 if (cur_channel <= last_sub_max_channel)
561 if (cur_sub_max_channel <= last_sub_max_channel)
566 * When dot11RegulatoryClassesRequired is supported
567 * we can throw ext triplets as part of this soup,
568 * for now we don't care when those change as we
571 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
572 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
573 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
575 last_sub_max_channel = cur_sub_max_channel;
582 * Note: this is not a IEEE requirement but
583 * simply a memory requirement
585 if (num_rules > NL80211_MAX_SUPP_REG_RULES)
589 country_ie = triplets_start;
590 country_ie_len = len_at_triplet;
592 size_of_regd = sizeof(struct ieee80211_regdomain) +
593 (num_rules * sizeof(struct ieee80211_reg_rule));
595 rd = kzalloc(size_of_regd, GFP_KERNEL);
599 rd->n_reg_rules = num_rules;
600 rd->alpha2[0] = alpha2[0];
601 rd->alpha2[1] = alpha2[1];
603 /* This time around we fill in the rd */
604 while (country_ie_len >= 3) {
606 struct ieee80211_country_ie_triplet *triplet =
607 (struct ieee80211_country_ie_triplet *) country_ie;
608 struct ieee80211_reg_rule *reg_rule = NULL;
609 struct ieee80211_freq_range *freq_range = NULL;
610 struct ieee80211_power_rule *power_rule = NULL;
613 * Must parse if dot11RegulatoryClassesRequired is true,
614 * we don't support this yet
616 if (triplet->ext.reg_extension_id >=
617 IEEE80211_COUNTRY_EXTENSION_ID) {
623 reg_rule = &rd->reg_rules[i];
624 freq_range = ®_rule->freq_range;
625 power_rule = ®_rule->power_rule;
627 reg_rule->flags = flags;
630 if (triplet->chans.first_channel <= 14)
631 end_channel = triplet->chans.first_channel +
632 triplet->chans.num_channels;
634 end_channel = triplet->chans.first_channel +
635 (4 * (triplet->chans.num_channels - 1));
638 * The +10 is since the regulatory domain expects
639 * the actual band edge, not the center of freq for
640 * its start and end freqs, assuming 20 MHz bandwidth on
641 * the channels passed
643 freq_range->start_freq_khz =
644 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
645 triplet->chans.first_channel) - 10);
646 freq_range->end_freq_khz =
647 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
651 * These are large arbitrary values we use to intersect later.
652 * Increment this if we ever support >= 40 MHz channels
655 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
656 power_rule->max_antenna_gain = DBI_TO_MBI(100);
657 power_rule->max_eirp = DBM_TO_MBM(100);
663 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
671 * Helper for regdom_intersect(), this does the real
672 * mathematical intersection fun
674 static int reg_rules_intersect(
675 const struct ieee80211_reg_rule *rule1,
676 const struct ieee80211_reg_rule *rule2,
677 struct ieee80211_reg_rule *intersected_rule)
679 const struct ieee80211_freq_range *freq_range1, *freq_range2;
680 struct ieee80211_freq_range *freq_range;
681 const struct ieee80211_power_rule *power_rule1, *power_rule2;
682 struct ieee80211_power_rule *power_rule;
685 freq_range1 = &rule1->freq_range;
686 freq_range2 = &rule2->freq_range;
687 freq_range = &intersected_rule->freq_range;
689 power_rule1 = &rule1->power_rule;
690 power_rule2 = &rule2->power_rule;
691 power_rule = &intersected_rule->power_rule;
693 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
694 freq_range2->start_freq_khz);
695 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
696 freq_range2->end_freq_khz);
697 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
698 freq_range2->max_bandwidth_khz);
700 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
701 if (freq_range->max_bandwidth_khz > freq_diff)
702 freq_range->max_bandwidth_khz = freq_diff;
704 power_rule->max_eirp = min(power_rule1->max_eirp,
705 power_rule2->max_eirp);
706 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
707 power_rule2->max_antenna_gain);
709 intersected_rule->flags = (rule1->flags | rule2->flags);
711 if (!is_valid_reg_rule(intersected_rule))
718 * regdom_intersect - do the intersection between two regulatory domains
719 * @rd1: first regulatory domain
720 * @rd2: second regulatory domain
722 * Use this function to get the intersection between two regulatory domains.
723 * Once completed we will mark the alpha2 for the rd as intersected, "98",
724 * as no one single alpha2 can represent this regulatory domain.
726 * Returns a pointer to the regulatory domain structure which will hold the
727 * resulting intersection of rules between rd1 and rd2. We will
728 * kzalloc() this structure for you.
730 static struct ieee80211_regdomain *regdom_intersect(
731 const struct ieee80211_regdomain *rd1,
732 const struct ieee80211_regdomain *rd2)
736 unsigned int num_rules = 0, rule_idx = 0;
737 const struct ieee80211_reg_rule *rule1, *rule2;
738 struct ieee80211_reg_rule *intersected_rule;
739 struct ieee80211_regdomain *rd;
740 /* This is just a dummy holder to help us count */
741 struct ieee80211_reg_rule irule;
743 /* Uses the stack temporarily for counter arithmetic */
744 intersected_rule = &irule;
746 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
752 * First we get a count of the rules we'll need, then we actually
753 * build them. This is to so we can malloc() and free() a
754 * regdomain once. The reason we use reg_rules_intersect() here
755 * is it will return -EINVAL if the rule computed makes no sense.
756 * All rules that do check out OK are valid.
759 for (x = 0; x < rd1->n_reg_rules; x++) {
760 rule1 = &rd1->reg_rules[x];
761 for (y = 0; y < rd2->n_reg_rules; y++) {
762 rule2 = &rd2->reg_rules[y];
763 if (!reg_rules_intersect(rule1, rule2,
766 memset(intersected_rule, 0,
767 sizeof(struct ieee80211_reg_rule));
774 size_of_regd = sizeof(struct ieee80211_regdomain) +
775 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
777 rd = kzalloc(size_of_regd, GFP_KERNEL);
781 for (x = 0; x < rd1->n_reg_rules; x++) {
782 rule1 = &rd1->reg_rules[x];
783 for (y = 0; y < rd2->n_reg_rules; y++) {
784 rule2 = &rd2->reg_rules[y];
786 * This time around instead of using the stack lets
787 * write to the target rule directly saving ourselves
790 intersected_rule = &rd->reg_rules[rule_idx];
791 r = reg_rules_intersect(rule1, rule2,
794 * No need to memset here the intersected rule here as
795 * we're not using the stack anymore
803 if (rule_idx != num_rules) {
808 rd->n_reg_rules = num_rules;
816 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
817 * want to just have the channel structure use these
819 static u32 map_regdom_flags(u32 rd_flags)
821 u32 channel_flags = 0;
822 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
823 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
824 if (rd_flags & NL80211_RRF_NO_IBSS)
825 channel_flags |= IEEE80211_CHAN_NO_IBSS;
826 if (rd_flags & NL80211_RRF_DFS)
827 channel_flags |= IEEE80211_CHAN_RADAR;
828 return channel_flags;
831 static int freq_reg_info_regd(struct wiphy *wiphy,
834 const struct ieee80211_reg_rule **reg_rule,
835 const struct ieee80211_regdomain *custom_regd)
838 bool band_rule_found = false;
839 const struct ieee80211_regdomain *regd;
840 u32 max_bandwidth = 0;
842 regd = custom_regd ? custom_regd : cfg80211_regdomain;
845 * Follow the driver's regulatory domain, if present, unless a country
846 * IE has been processed or a user wants to help complaince further
848 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
849 last_request->initiator != REGDOM_SET_BY_USER &&
856 for (i = 0; i < regd->n_reg_rules; i++) {
857 const struct ieee80211_reg_rule *rr;
858 const struct ieee80211_freq_range *fr = NULL;
859 const struct ieee80211_power_rule *pr = NULL;
861 rr = ®d->reg_rules[i];
862 fr = &rr->freq_range;
863 pr = &rr->power_rule;
866 * We only need to know if one frequency rule was
867 * was in center_freq's band, that's enough, so lets
868 * not overwrite it once found
870 if (!band_rule_found)
871 band_rule_found = freq_in_rule_band(fr, center_freq);
873 max_bandwidth = freq_max_bandwidth(fr, center_freq);
875 if (max_bandwidth && *bandwidth <= max_bandwidth) {
877 *bandwidth = max_bandwidth;
882 if (!band_rule_found)
885 return !max_bandwidth;
887 EXPORT_SYMBOL(freq_reg_info);
889 int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
890 const struct ieee80211_reg_rule **reg_rule)
892 return freq_reg_info_regd(wiphy, center_freq,
893 bandwidth, reg_rule, NULL);
896 static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
897 unsigned int chan_idx)
901 u32 max_bandwidth = 0;
902 const struct ieee80211_reg_rule *reg_rule = NULL;
903 const struct ieee80211_power_rule *power_rule = NULL;
904 struct ieee80211_supported_band *sband;
905 struct ieee80211_channel *chan;
906 struct wiphy *request_wiphy = NULL;
908 assert_cfg80211_lock();
910 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
912 sband = wiphy->bands[band];
913 BUG_ON(chan_idx >= sband->n_channels);
914 chan = &sband->channels[chan_idx];
916 flags = chan->orig_flags;
918 r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq),
919 &max_bandwidth, ®_rule);
923 * This means no regulatory rule was found in the country IE
924 * with a frequency range on the center_freq's band, since
925 * IEEE-802.11 allows for a country IE to have a subset of the
926 * regulatory information provided in a country we ignore
927 * disabling the channel unless at least one reg rule was
928 * found on the center_freq's band. For details see this
931 * http://tinyurl.com/11d-clarification
934 last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
935 #ifdef CONFIG_CFG80211_REG_DEBUG
936 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
937 "intact on %s - no rule found in band on "
939 chan->center_freq, wiphy_name(wiphy));
943 * In this case we know the country IE has at least one reg rule
944 * for the band so we respect its band definitions
946 #ifdef CONFIG_CFG80211_REG_DEBUG
947 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
948 printk(KERN_DEBUG "cfg80211: Disabling "
949 "channel %d MHz on %s due to "
951 chan->center_freq, wiphy_name(wiphy));
953 flags |= IEEE80211_CHAN_DISABLED;
959 power_rule = ®_rule->power_rule;
961 if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
962 request_wiphy && request_wiphy == wiphy &&
963 request_wiphy->strict_regulatory) {
965 * This gaurantees the driver's requested regulatory domain
966 * will always be used as a base for further regulatory
969 chan->flags = chan->orig_flags =
970 map_regdom_flags(reg_rule->flags);
971 chan->max_antenna_gain = chan->orig_mag =
972 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
973 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
974 chan->max_power = chan->orig_mpwr =
975 (int) MBM_TO_DBM(power_rule->max_eirp);
979 chan->flags = flags | map_regdom_flags(reg_rule->flags);
980 chan->max_antenna_gain = min(chan->orig_mag,
981 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
982 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
984 chan->max_power = min(chan->orig_mpwr,
985 (int) MBM_TO_DBM(power_rule->max_eirp));
987 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
990 static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
993 struct ieee80211_supported_band *sband;
995 BUG_ON(!wiphy->bands[band]);
996 sband = wiphy->bands[band];
998 for (i = 0; i < sband->n_channels; i++)
999 handle_channel(wiphy, band, i);
1002 static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby)
1006 if (setby == REGDOM_SET_BY_CORE &&
1007 wiphy->custom_regulatory)
1010 * wiphy->regd will be set once the device has its own
1011 * desired regulatory domain set
1013 if (wiphy->strict_regulatory && !wiphy->regd &&
1014 !is_world_regdom(last_request->alpha2))
1019 static void update_all_wiphy_regulatory(enum reg_set_by setby)
1021 struct cfg80211_registered_device *drv;
1023 list_for_each_entry(drv, &cfg80211_drv_list, list)
1024 wiphy_update_regulatory(&drv->wiphy, setby);
1027 static void handle_reg_beacon(struct wiphy *wiphy,
1028 unsigned int chan_idx,
1029 struct reg_beacon *reg_beacon)
1031 #ifdef CONFIG_CFG80211_REG_DEBUG
1032 #define REG_DEBUG_BEACON_FLAG(desc) \
1033 printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \
1034 "frequency: %d MHz (Ch %d) on %s\n", \
1035 reg_beacon->chan.center_freq, \
1036 ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \
1039 #define REG_DEBUG_BEACON_FLAG(desc) do {} while (0)
1041 struct ieee80211_supported_band *sband;
1042 struct ieee80211_channel *chan;
1044 assert_cfg80211_lock();
1046 sband = wiphy->bands[reg_beacon->chan.band];
1047 chan = &sband->channels[chan_idx];
1049 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1052 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
1053 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
1054 REG_DEBUG_BEACON_FLAG("active scanning");
1057 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
1058 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
1059 REG_DEBUG_BEACON_FLAG("beaconing");
1062 chan->beacon_found = true;
1063 #undef REG_DEBUG_BEACON_FLAG
1067 * Called when a scan on a wiphy finds a beacon on
1070 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1071 struct reg_beacon *reg_beacon)
1074 struct ieee80211_supported_band *sband;
1076 assert_cfg80211_lock();
1078 if (!wiphy->bands[reg_beacon->chan.band])
1081 sband = wiphy->bands[reg_beacon->chan.band];
1083 for (i = 0; i < sband->n_channels; i++)
1084 handle_reg_beacon(wiphy, i, reg_beacon);
1088 * Called upon reg changes or a new wiphy is added
1090 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1093 struct ieee80211_supported_band *sband;
1094 struct reg_beacon *reg_beacon;
1096 assert_cfg80211_lock();
1098 if (list_empty(®_beacon_list))
1101 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1102 if (!wiphy->bands[reg_beacon->chan.band])
1104 sband = wiphy->bands[reg_beacon->chan.band];
1105 for (i = 0; i < sband->n_channels; i++)
1106 handle_reg_beacon(wiphy, i, reg_beacon);
1110 static bool reg_is_world_roaming(struct wiphy *wiphy)
1112 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1113 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1115 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
1116 wiphy->custom_regulatory)
1121 /* Reap the advantages of previously found beacons */
1122 static void reg_process_beacons(struct wiphy *wiphy)
1124 if (!reg_is_world_roaming(wiphy))
1126 wiphy_update_beacon_reg(wiphy);
1129 void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
1131 enum ieee80211_band band;
1133 if (ignore_reg_update(wiphy, setby))
1135 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1136 if (wiphy->bands[band])
1137 handle_band(wiphy, band);
1140 reg_process_beacons(wiphy);
1141 if (wiphy->reg_notifier)
1142 wiphy->reg_notifier(wiphy, last_request);
1145 static void handle_channel_custom(struct wiphy *wiphy,
1146 enum ieee80211_band band,
1147 unsigned int chan_idx,
1148 const struct ieee80211_regdomain *regd)
1151 u32 max_bandwidth = 0;
1152 const struct ieee80211_reg_rule *reg_rule = NULL;
1153 const struct ieee80211_power_rule *power_rule = NULL;
1154 struct ieee80211_supported_band *sband;
1155 struct ieee80211_channel *chan;
1157 sband = wiphy->bands[band];
1158 BUG_ON(chan_idx >= sband->n_channels);
1159 chan = &sband->channels[chan_idx];
1161 r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1162 &max_bandwidth, ®_rule, regd);
1165 chan->flags = IEEE80211_CHAN_DISABLED;
1169 power_rule = ®_rule->power_rule;
1171 chan->flags |= map_regdom_flags(reg_rule->flags);
1172 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1173 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
1174 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1177 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1178 const struct ieee80211_regdomain *regd)
1181 struct ieee80211_supported_band *sband;
1183 BUG_ON(!wiphy->bands[band]);
1184 sband = wiphy->bands[band];
1186 for (i = 0; i < sband->n_channels; i++)
1187 handle_channel_custom(wiphy, band, i, regd);
1190 /* Used by drivers prior to wiphy registration */
1191 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1192 const struct ieee80211_regdomain *regd)
1194 enum ieee80211_band band;
1195 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1196 if (wiphy->bands[band])
1197 handle_band_custom(wiphy, band, regd);
1200 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1202 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
1203 const struct ieee80211_regdomain *src_regd)
1205 struct ieee80211_regdomain *regd;
1206 int size_of_regd = 0;
1209 size_of_regd = sizeof(struct ieee80211_regdomain) +
1210 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
1212 regd = kzalloc(size_of_regd, GFP_KERNEL);
1216 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
1218 for (i = 0; i < src_regd->n_reg_rules; i++)
1219 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
1220 sizeof(struct ieee80211_reg_rule));
1227 * Return value which can be used by ignore_request() to indicate
1228 * it has been determined we should intersect two regulatory domains
1230 #define REG_INTERSECT 1
1232 /* This has the logic which determines when a new request
1233 * should be ignored. */
1234 static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
1237 struct wiphy *last_wiphy = NULL;
1239 assert_cfg80211_lock();
1241 /* All initial requests are respected */
1246 case REGDOM_SET_BY_INIT:
1248 case REGDOM_SET_BY_CORE:
1250 case REGDOM_SET_BY_COUNTRY_IE:
1252 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1254 if (unlikely(!is_an_alpha2(alpha2)))
1256 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
1257 if (last_wiphy != wiphy) {
1259 * Two cards with two APs claiming different
1260 * different Country IE alpha2s. We could
1261 * intersect them, but that seems unlikely
1262 * to be correct. Reject second one for now.
1264 if (regdom_changes(alpha2))
1269 * Two consecutive Country IE hints on the same wiphy.
1270 * This should be picked up early by the driver/stack
1272 if (WARN_ON(regdom_changes(alpha2)))
1276 return REG_INTERSECT;
1277 case REGDOM_SET_BY_DRIVER:
1278 if (last_request->initiator == REGDOM_SET_BY_CORE) {
1279 if (is_old_static_regdom(cfg80211_regdomain))
1281 if (regdom_changes(alpha2))
1287 * This would happen if you unplug and plug your card
1288 * back in or if you add a new device for which the previously
1289 * loaded card also agrees on the regulatory domain.
1291 if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
1292 !regdom_changes(alpha2))
1295 return REG_INTERSECT;
1296 case REGDOM_SET_BY_USER:
1297 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
1298 return REG_INTERSECT;
1300 * If the user knows better the user should set the regdom
1301 * to their country before the IE is picked up
1303 if (last_request->initiator == REGDOM_SET_BY_USER &&
1304 last_request->intersect)
1307 * Process user requests only after previous user/driver/core
1308 * requests have been processed
1310 if (last_request->initiator == REGDOM_SET_BY_CORE ||
1311 last_request->initiator == REGDOM_SET_BY_DRIVER ||
1312 last_request->initiator == REGDOM_SET_BY_USER) {
1313 if (regdom_changes(last_request->alpha2))
1317 if (!is_old_static_regdom(cfg80211_regdomain) &&
1318 !regdom_changes(alpha2))
1328 * __regulatory_hint - hint to the wireless core a regulatory domain
1329 * @wiphy: if the hint comes from country information from an AP, this
1330 * is required to be set to the wiphy that received the information
1331 * @alpha2: the ISO/IEC 3166 alpha2 being claimed the regulatory domain
1333 * @country_ie_checksum: checksum of processed country IE, set this to 0
1334 * if the hint did not come from a country IE
1335 * @country_ie_env: the environment the IE told us we are in, %ENVIRON_*
1337 * The Wireless subsystem can use this function to hint to the wireless core
1338 * what it believes should be the current regulatory domain by giving it an
1339 * ISO/IEC 3166 alpha2 country code it knows its regulatory domain should be
1342 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1343 * already been set or other standard error codes.
1345 * Caller must hold &cfg80211_mutex
1347 static int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
1349 u32 country_ie_checksum,
1350 enum environment_cap env)
1352 struct regulatory_request *request;
1353 bool intersect = false;
1356 assert_cfg80211_lock();
1358 r = ignore_request(wiphy, set_by, alpha2);
1360 if (r == REG_INTERSECT) {
1361 if (set_by == REGDOM_SET_BY_DRIVER) {
1362 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1369 * If the regulatory domain being requested by the
1370 * driver has already been set just copy it to the
1373 if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) {
1374 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1384 request = kzalloc(sizeof(struct regulatory_request),
1389 request->alpha2[0] = alpha2[0];
1390 request->alpha2[1] = alpha2[1];
1391 request->initiator = set_by;
1392 request->wiphy_idx = get_wiphy_idx(wiphy);
1393 request->intersect = intersect;
1394 request->country_ie_checksum = country_ie_checksum;
1395 request->country_ie_env = env;
1397 kfree(last_request);
1398 last_request = request;
1400 /* When r == REG_INTERSECT we do need to call CRDA */
1405 * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
1406 * AND if CRDA is NOT present nothing will happen, if someone
1407 * wants to bother with 11d with OLD_REG you can add a timer.
1408 * If after x amount of time nothing happens you can call:
1410 * return set_regdom(country_ie_regdomain);
1412 * to intersect with the static rd
1414 return call_crda(alpha2);
1417 /* This currently only processes user and driver regulatory hints */
1418 static int reg_process_hint(struct regulatory_request *reg_request)
1421 struct wiphy *wiphy = NULL;
1423 BUG_ON(!reg_request->alpha2);
1425 mutex_lock(&cfg80211_mutex);
1427 if (wiphy_idx_valid(reg_request->wiphy_idx))
1428 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1430 if (reg_request->initiator == REGDOM_SET_BY_DRIVER &&
1436 r = __regulatory_hint(wiphy,
1437 reg_request->initiator,
1438 reg_request->alpha2,
1439 reg_request->country_ie_checksum,
1440 reg_request->country_ie_env);
1441 /* This is required so that the orig_* parameters are saved */
1442 if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
1443 wiphy_update_regulatory(wiphy, reg_request->initiator);
1445 mutex_unlock(&cfg80211_mutex);
1453 /* Processes regulatory hints, this is all the REGDOM_SET_BY_* */
1454 static void reg_process_pending_hints(void)
1456 struct regulatory_request *reg_request;
1459 spin_lock(®_requests_lock);
1460 while (!list_empty(®_requests_list)) {
1461 reg_request = list_first_entry(®_requests_list,
1462 struct regulatory_request,
1464 list_del_init(®_request->list);
1465 spin_unlock(®_requests_lock);
1467 r = reg_process_hint(reg_request);
1468 #ifdef CONFIG_CFG80211_REG_DEBUG
1469 if (r && (reg_request->initiator == REGDOM_SET_BY_DRIVER ||
1470 reg_request->initiator == REGDOM_SET_BY_COUNTRY_IE))
1471 printk(KERN_ERR "cfg80211: wiphy_idx %d sent a "
1472 "regulatory hint for %c%c but now has "
1473 "gone fishing, ignoring request\n",
1474 reg_request->wiphy_idx,
1475 reg_request->alpha2[0],
1476 reg_request->alpha2[1]);
1479 spin_lock(®_requests_lock);
1481 spin_unlock(®_requests_lock);
1484 /* Processes beacon hints -- this has nothing to do with country IEs */
1485 static void reg_process_pending_beacon_hints(void)
1487 struct cfg80211_registered_device *drv;
1488 struct reg_beacon *pending_beacon, *tmp;
1490 mutex_lock(&cfg80211_mutex);
1492 /* This goes through the _pending_ beacon list */
1493 spin_lock_bh(®_pending_beacons_lock);
1495 if (list_empty(®_pending_beacons)) {
1496 spin_unlock_bh(®_pending_beacons_lock);
1500 list_for_each_entry_safe(pending_beacon, tmp,
1501 ®_pending_beacons, list) {
1503 list_del_init(&pending_beacon->list);
1505 /* Applies the beacon hint to current wiphys */
1506 list_for_each_entry(drv, &cfg80211_drv_list, list)
1507 wiphy_update_new_beacon(&drv->wiphy, pending_beacon);
1509 /* Remembers the beacon hint for new wiphys or reg changes */
1510 list_add_tail(&pending_beacon->list, ®_beacon_list);
1513 spin_unlock_bh(®_pending_beacons_lock);
1515 mutex_unlock(&cfg80211_mutex);
1518 static void reg_todo(struct work_struct *work)
1520 reg_process_pending_hints();
1521 reg_process_pending_beacon_hints();
1524 static DECLARE_WORK(reg_work, reg_todo);
1526 static void queue_regulatory_request(struct regulatory_request *request)
1528 spin_lock(®_requests_lock);
1529 list_add_tail(&request->list, ®_requests_list);
1530 spin_unlock(®_requests_lock);
1532 schedule_work(®_work);
1535 /* Core regulatory hint -- happens once during cfg80211_init() */
1536 static int regulatory_hint_core(const char *alpha2)
1538 struct regulatory_request *request;
1540 BUG_ON(last_request);
1542 request = kzalloc(sizeof(struct regulatory_request),
1547 request->alpha2[0] = alpha2[0];
1548 request->alpha2[1] = alpha2[1];
1549 request->initiator = REGDOM_SET_BY_CORE;
1551 queue_regulatory_request(request);
1557 int regulatory_hint_user(const char *alpha2)
1559 struct regulatory_request *request;
1563 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1567 request->wiphy_idx = WIPHY_IDX_STALE;
1568 request->alpha2[0] = alpha2[0];
1569 request->alpha2[1] = alpha2[1];
1570 request->initiator = REGDOM_SET_BY_USER,
1572 queue_regulatory_request(request);
1578 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1580 struct regulatory_request *request;
1585 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1589 request->wiphy_idx = get_wiphy_idx(wiphy);
1591 /* Must have registered wiphy first */
1592 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1594 request->alpha2[0] = alpha2[0];
1595 request->alpha2[1] = alpha2[1];
1596 request->initiator = REGDOM_SET_BY_DRIVER;
1598 queue_regulatory_request(request);
1602 EXPORT_SYMBOL(regulatory_hint);
1604 static bool reg_same_country_ie_hint(struct wiphy *wiphy,
1605 u32 country_ie_checksum)
1607 struct wiphy *request_wiphy;
1609 assert_cfg80211_lock();
1611 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1616 if (likely(request_wiphy != wiphy))
1617 return !country_ie_integrity_changes(country_ie_checksum);
1619 * We should not have let these through at this point, they
1620 * should have been picked up earlier by the first alpha2 check
1623 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
1628 void regulatory_hint_11d(struct wiphy *wiphy,
1632 struct ieee80211_regdomain *rd = NULL;
1635 enum environment_cap env = ENVIRON_ANY;
1636 struct regulatory_request *request;
1638 mutex_lock(&cfg80211_mutex);
1640 if (unlikely(!last_request)) {
1641 mutex_unlock(&cfg80211_mutex);
1645 /* IE len must be evenly divisible by 2 */
1646 if (country_ie_len & 0x01)
1649 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1653 * Pending country IE processing, this can happen after we
1654 * call CRDA and wait for a response if a beacon was received before
1655 * we were able to process the last regulatory_hint_11d() call
1657 if (country_ie_regdomain)
1660 alpha2[0] = country_ie[0];
1661 alpha2[1] = country_ie[1];
1663 if (country_ie[2] == 'I')
1664 env = ENVIRON_INDOOR;
1665 else if (country_ie[2] == 'O')
1666 env = ENVIRON_OUTDOOR;
1669 * We will run this for *every* beacon processed for the BSSID, so
1670 * we optimize an early check to exit out early if we don't have to
1673 if (likely(wiphy_idx_valid(last_request->wiphy_idx))) {
1674 struct cfg80211_registered_device *drv_last_ie;
1677 cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx);
1680 * Lets keep this simple -- we trust the first AP
1681 * after we intersect with CRDA
1683 if (likely(&drv_last_ie->wiphy == wiphy)) {
1685 * Ignore IEs coming in on this wiphy with
1686 * the same alpha2 and environment cap
1688 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1690 env == drv_last_ie->env)) {
1694 * the wiphy moved on to another BSSID or the AP
1695 * was reconfigured. XXX: We need to deal with the
1696 * case where the user suspends and goes to goes
1697 * to another country, and then gets IEs from an
1698 * AP with different settings
1703 * Ignore IEs coming in on two separate wiphys with
1704 * the same alpha2 and environment cap
1706 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1708 env == drv_last_ie->env)) {
1711 /* We could potentially intersect though */
1716 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
1721 * This will not happen right now but we leave it here for the
1722 * the future when we want to add suspend/resume support and having
1723 * the user move to another country after doing so, or having the user
1724 * move to another AP. Right now we just trust the first AP.
1726 * If we hit this before we add this support we want to be informed of
1727 * it as it would indicate a mistake in the current design
1729 if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))
1732 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1737 * We keep this around for when CRDA comes back with a response so
1738 * we can intersect with that
1740 country_ie_regdomain = rd;
1742 request->wiphy_idx = get_wiphy_idx(wiphy);
1743 request->alpha2[0] = rd->alpha2[0];
1744 request->alpha2[1] = rd->alpha2[1];
1745 request->initiator = REGDOM_SET_BY_COUNTRY_IE;
1746 request->country_ie_checksum = checksum;
1747 request->country_ie_env = env;
1749 mutex_unlock(&cfg80211_mutex);
1751 queue_regulatory_request(request);
1758 mutex_unlock(&cfg80211_mutex);
1760 EXPORT_SYMBOL(regulatory_hint_11d);
1762 static bool freq_is_chan_12_13_14(u16 freq)
1764 if (freq == ieee80211_channel_to_frequency(12) ||
1765 freq == ieee80211_channel_to_frequency(13) ||
1766 freq == ieee80211_channel_to_frequency(14))
1771 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1772 struct ieee80211_channel *beacon_chan,
1775 struct reg_beacon *reg_beacon;
1777 if (likely((beacon_chan->beacon_found ||
1778 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1779 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1780 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1783 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1787 #ifdef CONFIG_CFG80211_REG_DEBUG
1788 printk(KERN_DEBUG "cfg80211: Found new beacon on "
1789 "frequency: %d MHz (Ch %d) on %s\n",
1790 beacon_chan->center_freq,
1791 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1794 memcpy(®_beacon->chan, beacon_chan,
1795 sizeof(struct ieee80211_channel));
1799 * Since we can be called from BH or and non-BH context
1800 * we must use spin_lock_bh()
1802 spin_lock_bh(®_pending_beacons_lock);
1803 list_add_tail(®_beacon->list, ®_pending_beacons);
1804 spin_unlock_bh(®_pending_beacons_lock);
1806 schedule_work(®_work);
1811 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1814 const struct ieee80211_reg_rule *reg_rule = NULL;
1815 const struct ieee80211_freq_range *freq_range = NULL;
1816 const struct ieee80211_power_rule *power_rule = NULL;
1818 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
1819 "(max_antenna_gain, max_eirp)\n");
1821 for (i = 0; i < rd->n_reg_rules; i++) {
1822 reg_rule = &rd->reg_rules[i];
1823 freq_range = ®_rule->freq_range;
1824 power_rule = ®_rule->power_rule;
1827 * There may not be documentation for max antenna gain
1828 * in certain regions
1830 if (power_rule->max_antenna_gain)
1831 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1832 "(%d mBi, %d mBm)\n",
1833 freq_range->start_freq_khz,
1834 freq_range->end_freq_khz,
1835 freq_range->max_bandwidth_khz,
1836 power_rule->max_antenna_gain,
1837 power_rule->max_eirp);
1839 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1841 freq_range->start_freq_khz,
1842 freq_range->end_freq_khz,
1843 freq_range->max_bandwidth_khz,
1844 power_rule->max_eirp);
1848 static void print_regdomain(const struct ieee80211_regdomain *rd)
1851 if (is_intersected_alpha2(rd->alpha2)) {
1853 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
1854 struct cfg80211_registered_device *drv;
1855 drv = cfg80211_drv_by_wiphy_idx(
1856 last_request->wiphy_idx);
1858 printk(KERN_INFO "cfg80211: Current regulatory "
1859 "domain updated by AP to: %c%c\n",
1860 drv->country_ie_alpha2[0],
1861 drv->country_ie_alpha2[1]);
1863 printk(KERN_INFO "cfg80211: Current regulatory "
1864 "domain intersected: \n");
1866 printk(KERN_INFO "cfg80211: Current regulatory "
1867 "domain intersected: \n");
1868 } else if (is_world_regdom(rd->alpha2))
1869 printk(KERN_INFO "cfg80211: World regulatory "
1870 "domain updated:\n");
1872 if (is_unknown_alpha2(rd->alpha2))
1873 printk(KERN_INFO "cfg80211: Regulatory domain "
1874 "changed to driver built-in settings "
1875 "(unknown country)\n");
1877 printk(KERN_INFO "cfg80211: Regulatory domain "
1878 "changed to country: %c%c\n",
1879 rd->alpha2[0], rd->alpha2[1]);
1884 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1886 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1887 rd->alpha2[0], rd->alpha2[1]);
1891 #ifdef CONFIG_CFG80211_REG_DEBUG
1892 static void reg_country_ie_process_debug(
1893 const struct ieee80211_regdomain *rd,
1894 const struct ieee80211_regdomain *country_ie_regdomain,
1895 const struct ieee80211_regdomain *intersected_rd)
1897 printk(KERN_DEBUG "cfg80211: Received country IE:\n");
1898 print_regdomain_info(country_ie_regdomain);
1899 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
1900 print_regdomain_info(rd);
1901 if (intersected_rd) {
1902 printk(KERN_DEBUG "cfg80211: We intersect both of these "
1904 print_regdomain_info(intersected_rd);
1907 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
1910 static inline void reg_country_ie_process_debug(
1911 const struct ieee80211_regdomain *rd,
1912 const struct ieee80211_regdomain *country_ie_regdomain,
1913 const struct ieee80211_regdomain *intersected_rd)
1918 /* Takes ownership of rd only if it doesn't fail */
1919 static int __set_regdom(const struct ieee80211_regdomain *rd)
1921 const struct ieee80211_regdomain *intersected_rd = NULL;
1922 struct cfg80211_registered_device *drv = NULL;
1923 struct wiphy *request_wiphy;
1924 /* Some basic sanity checks first */
1926 if (is_world_regdom(rd->alpha2)) {
1927 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1929 update_world_regdomain(rd);
1933 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1934 !is_unknown_alpha2(rd->alpha2))
1941 * Lets only bother proceeding on the same alpha2 if the current
1942 * rd is non static (it means CRDA was present and was used last)
1943 * and the pending request came in from a country IE
1945 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1947 * If someone else asked us to change the rd lets only bother
1948 * checking if the alpha2 changes if CRDA was already called
1950 if (!is_old_static_regdom(cfg80211_regdomain) &&
1951 !regdom_changes(rd->alpha2))
1956 * Now lets set the regulatory domain, update all driver channels
1957 * and finally inform them of what we have done, in case they want
1958 * to review or adjust their own settings based on their own
1959 * internal EEPROM data
1962 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1965 if (!is_valid_rd(rd)) {
1966 printk(KERN_ERR "cfg80211: Invalid "
1967 "regulatory domain detected:\n");
1968 print_regdomain_info(rd);
1972 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1974 if (!last_request->intersect) {
1977 if (last_request->initiator != REGDOM_SET_BY_DRIVER) {
1979 cfg80211_regdomain = rd;
1984 * For a driver hint, lets copy the regulatory domain the
1985 * driver wanted to the wiphy to deal with conflicts
1988 BUG_ON(request_wiphy->regd);
1990 r = reg_copy_regd(&request_wiphy->regd, rd);
1995 cfg80211_regdomain = rd;
1999 /* Intersection requires a bit more work */
2001 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
2003 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2004 if (!intersected_rd)
2008 * We can trash what CRDA provided now.
2009 * However if a driver requested this specific regulatory
2010 * domain we keep it for its private use
2012 if (last_request->initiator == REGDOM_SET_BY_DRIVER)
2013 request_wiphy->regd = rd;
2020 cfg80211_regdomain = intersected_rd;
2026 * Country IE requests are handled a bit differently, we intersect
2027 * the country IE rd with what CRDA believes that country should have
2030 BUG_ON(!country_ie_regdomain);
2032 if (rd != country_ie_regdomain) {
2034 * Intersect what CRDA returned and our what we
2035 * had built from the Country IE received
2038 intersected_rd = regdom_intersect(rd, country_ie_regdomain);
2040 reg_country_ie_process_debug(rd, country_ie_regdomain,
2043 kfree(country_ie_regdomain);
2044 country_ie_regdomain = NULL;
2047 * This would happen when CRDA was not present and
2048 * OLD_REGULATORY was enabled. We intersect our Country
2049 * IE rd and what was set on cfg80211 originally
2051 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2054 if (!intersected_rd)
2057 drv = wiphy_to_dev(request_wiphy);
2059 drv->country_ie_alpha2[0] = rd->alpha2[0];
2060 drv->country_ie_alpha2[1] = rd->alpha2[1];
2061 drv->env = last_request->country_ie_env;
2063 BUG_ON(intersected_rd == rd);
2069 cfg80211_regdomain = intersected_rd;
2076 * Use this call to set the current regulatory domain. Conflicts with
2077 * multiple drivers can be ironed out later. Caller must've already
2078 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2080 int set_regdom(const struct ieee80211_regdomain *rd)
2084 assert_cfg80211_lock();
2086 /* Note that this doesn't update the wiphys, this is done below */
2087 r = __set_regdom(rd);
2093 /* This would make this whole thing pointless */
2094 if (!last_request->intersect)
2095 BUG_ON(rd != cfg80211_regdomain);
2097 /* update all wiphys now with the new established regulatory domain */
2098 update_all_wiphy_regulatory(last_request->initiator);
2100 print_regdomain(cfg80211_regdomain);
2105 /* Caller must hold cfg80211_mutex */
2106 void reg_device_remove(struct wiphy *wiphy)
2108 struct wiphy *request_wiphy;
2110 assert_cfg80211_lock();
2112 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2115 if (!last_request || !request_wiphy)
2117 if (request_wiphy != wiphy)
2119 last_request->wiphy_idx = WIPHY_IDX_STALE;
2120 last_request->country_ie_env = ENVIRON_ANY;
2123 int regulatory_init(void)
2127 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2128 if (IS_ERR(reg_pdev))
2129 return PTR_ERR(reg_pdev);
2131 spin_lock_init(®_requests_lock);
2132 spin_lock_init(®_pending_beacons_lock);
2134 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
2135 cfg80211_regdomain = static_regdom(ieee80211_regdom);
2137 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
2138 print_regdomain_info(cfg80211_regdomain);
2140 * The old code still requests for a new regdomain and if
2141 * you have CRDA you get it updated, otherwise you get
2142 * stuck with the static values. We ignore "EU" code as
2143 * that is not a valid ISO / IEC 3166 alpha2
2145 if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
2146 err = regulatory_hint_core(ieee80211_regdom);
2148 cfg80211_regdomain = cfg80211_world_regdom;
2150 err = regulatory_hint_core("00");
2156 * N.B. kobject_uevent_env() can fail mainly for when we're out
2157 * memory which is handled and propagated appropriately above
2158 * but it can also fail during a netlink_broadcast() or during
2159 * early boot for call_usermodehelper(). For now treat these
2160 * errors as non-fatal.
2162 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
2163 "to call CRDA during init");
2164 #ifdef CONFIG_CFG80211_REG_DEBUG
2165 /* We want to find out exactly why when debugging */
2173 void regulatory_exit(void)
2175 struct regulatory_request *reg_request, *tmp;
2176 struct reg_beacon *reg_beacon, *btmp;
2178 cancel_work_sync(®_work);
2180 mutex_lock(&cfg80211_mutex);
2184 kfree(country_ie_regdomain);
2185 country_ie_regdomain = NULL;
2187 kfree(last_request);
2189 platform_device_unregister(reg_pdev);
2191 spin_lock_bh(®_pending_beacons_lock);
2192 if (!list_empty(®_pending_beacons)) {
2193 list_for_each_entry_safe(reg_beacon, btmp,
2194 ®_pending_beacons, list) {
2195 list_del(®_beacon->list);
2199 spin_unlock_bh(®_pending_beacons_lock);
2201 if (!list_empty(®_beacon_list)) {
2202 list_for_each_entry_safe(reg_beacon, btmp,
2203 ®_beacon_list, list) {
2204 list_del(®_beacon->list);
2209 spin_lock(®_requests_lock);
2210 if (!list_empty(®_requests_list)) {
2211 list_for_each_entry_safe(reg_request, tmp,
2212 ®_requests_list, list) {
2213 list_del(®_request->list);
2217 spin_unlock(®_requests_lock);
2219 mutex_unlock(&cfg80211_mutex);