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_range->end_freq_khz <= freq_range->start_freq_khz ||
396 freq_range->max_bandwidth_khz > freq_diff)
402 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
404 const struct ieee80211_reg_rule *reg_rule = NULL;
407 if (!rd->n_reg_rules)
410 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
413 for (i = 0; i < rd->n_reg_rules; i++) {
414 reg_rule = &rd->reg_rules[i];
415 if (!is_valid_reg_rule(reg_rule))
422 /* Returns value in KHz */
423 static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
427 for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
428 u32 start_freq_khz = freq - supported_bandwidths[i]/2;
429 u32 end_freq_khz = freq + supported_bandwidths[i]/2;
430 if (start_freq_khz >= freq_range->start_freq_khz &&
431 end_freq_khz <= freq_range->end_freq_khz)
432 return supported_bandwidths[i];
438 * freq_in_rule_band - tells us if a frequency is in a frequency band
439 * @freq_range: frequency rule we want to query
440 * @freq_khz: frequency we are inquiring about
442 * This lets us know if a specific frequency rule is or is not relevant to
443 * a specific frequency's band. Bands are device specific and artificial
444 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
445 * safe for now to assume that a frequency rule should not be part of a
446 * frequency's band if the start freq or end freq are off by more than 2 GHz.
447 * This resolution can be lowered and should be considered as we add
448 * regulatory rule support for other "bands".
450 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
453 #define ONE_GHZ_IN_KHZ 1000000
454 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
456 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
459 #undef ONE_GHZ_IN_KHZ
463 * Converts a country IE to a regulatory domain. A regulatory domain
464 * structure has a lot of information which the IE doesn't yet have,
465 * so for the other values we use upper max values as we will intersect
466 * with our userspace regulatory agent to get lower bounds.
468 static struct ieee80211_regdomain *country_ie_2_rd(
473 struct ieee80211_regdomain *rd = NULL;
477 u32 num_rules = 0, size_of_regd = 0;
478 u8 *triplets_start = NULL;
479 u8 len_at_triplet = 0;
480 /* the last channel we have registered in a subband (triplet) */
481 int last_sub_max_channel = 0;
483 *checksum = 0xDEADBEEF;
485 /* Country IE requirements */
486 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
487 country_ie_len & 0x01);
489 alpha2[0] = country_ie[0];
490 alpha2[1] = country_ie[1];
493 * Third octet can be:
497 * anything else we assume is no restrictions
499 if (country_ie[2] == 'I')
500 flags = NL80211_RRF_NO_OUTDOOR;
501 else if (country_ie[2] == 'O')
502 flags = NL80211_RRF_NO_INDOOR;
507 triplets_start = country_ie;
508 len_at_triplet = country_ie_len;
510 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
513 * We need to build a reg rule for each triplet, but first we must
514 * calculate the number of reg rules we will need. We will need one
515 * for each channel subband
517 while (country_ie_len >= 3) {
519 struct ieee80211_country_ie_triplet *triplet =
520 (struct ieee80211_country_ie_triplet *) country_ie;
521 int cur_sub_max_channel = 0, cur_channel = 0;
523 if (triplet->ext.reg_extension_id >=
524 IEEE80211_COUNTRY_EXTENSION_ID) {
531 if (triplet->chans.first_channel <= 14)
532 end_channel = triplet->chans.first_channel +
533 triplet->chans.num_channels;
536 * 5 GHz -- For example in country IEs if the first
537 * channel given is 36 and the number of channels is 4
538 * then the individual channel numbers defined for the
539 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
540 * and not 36, 37, 38, 39.
542 * See: http://tinyurl.com/11d-clarification
544 end_channel = triplet->chans.first_channel +
545 (4 * (triplet->chans.num_channels - 1));
547 cur_channel = triplet->chans.first_channel;
548 cur_sub_max_channel = end_channel;
550 /* Basic sanity check */
551 if (cur_sub_max_channel < cur_channel)
555 * Do not allow overlapping channels. Also channels
556 * passed in each subband must be monotonically
559 if (last_sub_max_channel) {
560 if (cur_channel <= last_sub_max_channel)
562 if (cur_sub_max_channel <= last_sub_max_channel)
567 * When dot11RegulatoryClassesRequired is supported
568 * we can throw ext triplets as part of this soup,
569 * for now we don't care when those change as we
572 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
573 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
574 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
576 last_sub_max_channel = cur_sub_max_channel;
583 * Note: this is not a IEEE requirement but
584 * simply a memory requirement
586 if (num_rules > NL80211_MAX_SUPP_REG_RULES)
590 country_ie = triplets_start;
591 country_ie_len = len_at_triplet;
593 size_of_regd = sizeof(struct ieee80211_regdomain) +
594 (num_rules * sizeof(struct ieee80211_reg_rule));
596 rd = kzalloc(size_of_regd, GFP_KERNEL);
600 rd->n_reg_rules = num_rules;
601 rd->alpha2[0] = alpha2[0];
602 rd->alpha2[1] = alpha2[1];
604 /* This time around we fill in the rd */
605 while (country_ie_len >= 3) {
607 struct ieee80211_country_ie_triplet *triplet =
608 (struct ieee80211_country_ie_triplet *) country_ie;
609 struct ieee80211_reg_rule *reg_rule = NULL;
610 struct ieee80211_freq_range *freq_range = NULL;
611 struct ieee80211_power_rule *power_rule = NULL;
614 * Must parse if dot11RegulatoryClassesRequired is true,
615 * we don't support this yet
617 if (triplet->ext.reg_extension_id >=
618 IEEE80211_COUNTRY_EXTENSION_ID) {
624 reg_rule = &rd->reg_rules[i];
625 freq_range = ®_rule->freq_range;
626 power_rule = ®_rule->power_rule;
628 reg_rule->flags = flags;
631 if (triplet->chans.first_channel <= 14)
632 end_channel = triplet->chans.first_channel +
633 triplet->chans.num_channels;
635 end_channel = triplet->chans.first_channel +
636 (4 * (triplet->chans.num_channels - 1));
639 * The +10 is since the regulatory domain expects
640 * the actual band edge, not the center of freq for
641 * its start and end freqs, assuming 20 MHz bandwidth on
642 * the channels passed
644 freq_range->start_freq_khz =
645 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
646 triplet->chans.first_channel) - 10);
647 freq_range->end_freq_khz =
648 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
652 * These are large arbitrary values we use to intersect later.
653 * Increment this if we ever support >= 40 MHz channels
656 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
657 power_rule->max_antenna_gain = DBI_TO_MBI(100);
658 power_rule->max_eirp = DBM_TO_MBM(100);
664 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
672 * Helper for regdom_intersect(), this does the real
673 * mathematical intersection fun
675 static int reg_rules_intersect(
676 const struct ieee80211_reg_rule *rule1,
677 const struct ieee80211_reg_rule *rule2,
678 struct ieee80211_reg_rule *intersected_rule)
680 const struct ieee80211_freq_range *freq_range1, *freq_range2;
681 struct ieee80211_freq_range *freq_range;
682 const struct ieee80211_power_rule *power_rule1, *power_rule2;
683 struct ieee80211_power_rule *power_rule;
686 freq_range1 = &rule1->freq_range;
687 freq_range2 = &rule2->freq_range;
688 freq_range = &intersected_rule->freq_range;
690 power_rule1 = &rule1->power_rule;
691 power_rule2 = &rule2->power_rule;
692 power_rule = &intersected_rule->power_rule;
694 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
695 freq_range2->start_freq_khz);
696 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
697 freq_range2->end_freq_khz);
698 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
699 freq_range2->max_bandwidth_khz);
701 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
702 if (freq_range->max_bandwidth_khz > freq_diff)
703 freq_range->max_bandwidth_khz = freq_diff;
705 power_rule->max_eirp = min(power_rule1->max_eirp,
706 power_rule2->max_eirp);
707 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
708 power_rule2->max_antenna_gain);
710 intersected_rule->flags = (rule1->flags | rule2->flags);
712 if (!is_valid_reg_rule(intersected_rule))
719 * regdom_intersect - do the intersection between two regulatory domains
720 * @rd1: first regulatory domain
721 * @rd2: second regulatory domain
723 * Use this function to get the intersection between two regulatory domains.
724 * Once completed we will mark the alpha2 for the rd as intersected, "98",
725 * as no one single alpha2 can represent this regulatory domain.
727 * Returns a pointer to the regulatory domain structure which will hold the
728 * resulting intersection of rules between rd1 and rd2. We will
729 * kzalloc() this structure for you.
731 static struct ieee80211_regdomain *regdom_intersect(
732 const struct ieee80211_regdomain *rd1,
733 const struct ieee80211_regdomain *rd2)
737 unsigned int num_rules = 0, rule_idx = 0;
738 const struct ieee80211_reg_rule *rule1, *rule2;
739 struct ieee80211_reg_rule *intersected_rule;
740 struct ieee80211_regdomain *rd;
741 /* This is just a dummy holder to help us count */
742 struct ieee80211_reg_rule irule;
744 /* Uses the stack temporarily for counter arithmetic */
745 intersected_rule = &irule;
747 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
753 * First we get a count of the rules we'll need, then we actually
754 * build them. This is to so we can malloc() and free() a
755 * regdomain once. The reason we use reg_rules_intersect() here
756 * is it will return -EINVAL if the rule computed makes no sense.
757 * All rules that do check out OK are valid.
760 for (x = 0; x < rd1->n_reg_rules; x++) {
761 rule1 = &rd1->reg_rules[x];
762 for (y = 0; y < rd2->n_reg_rules; y++) {
763 rule2 = &rd2->reg_rules[y];
764 if (!reg_rules_intersect(rule1, rule2,
767 memset(intersected_rule, 0,
768 sizeof(struct ieee80211_reg_rule));
775 size_of_regd = sizeof(struct ieee80211_regdomain) +
776 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
778 rd = kzalloc(size_of_regd, GFP_KERNEL);
782 for (x = 0; x < rd1->n_reg_rules; x++) {
783 rule1 = &rd1->reg_rules[x];
784 for (y = 0; y < rd2->n_reg_rules; y++) {
785 rule2 = &rd2->reg_rules[y];
787 * This time around instead of using the stack lets
788 * write to the target rule directly saving ourselves
791 intersected_rule = &rd->reg_rules[rule_idx];
792 r = reg_rules_intersect(rule1, rule2,
795 * No need to memset here the intersected rule here as
796 * we're not using the stack anymore
804 if (rule_idx != num_rules) {
809 rd->n_reg_rules = num_rules;
817 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
818 * want to just have the channel structure use these
820 static u32 map_regdom_flags(u32 rd_flags)
822 u32 channel_flags = 0;
823 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
824 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
825 if (rd_flags & NL80211_RRF_NO_IBSS)
826 channel_flags |= IEEE80211_CHAN_NO_IBSS;
827 if (rd_flags & NL80211_RRF_DFS)
828 channel_flags |= IEEE80211_CHAN_RADAR;
829 return channel_flags;
832 static int freq_reg_info_regd(struct wiphy *wiphy,
835 const struct ieee80211_reg_rule **reg_rule,
836 const struct ieee80211_regdomain *custom_regd)
839 bool band_rule_found = false;
840 const struct ieee80211_regdomain *regd;
841 u32 max_bandwidth = 0;
843 regd = custom_regd ? custom_regd : cfg80211_regdomain;
846 * Follow the driver's regulatory domain, if present, unless a country
847 * IE has been processed or a user wants to help complaince further
849 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
850 last_request->initiator != REGDOM_SET_BY_USER &&
857 for (i = 0; i < regd->n_reg_rules; i++) {
858 const struct ieee80211_reg_rule *rr;
859 const struct ieee80211_freq_range *fr = NULL;
860 const struct ieee80211_power_rule *pr = NULL;
862 rr = ®d->reg_rules[i];
863 fr = &rr->freq_range;
864 pr = &rr->power_rule;
867 * We only need to know if one frequency rule was
868 * was in center_freq's band, that's enough, so lets
869 * not overwrite it once found
871 if (!band_rule_found)
872 band_rule_found = freq_in_rule_band(fr, center_freq);
874 max_bandwidth = freq_max_bandwidth(fr, center_freq);
876 if (max_bandwidth && *bandwidth <= max_bandwidth) {
878 *bandwidth = max_bandwidth;
883 if (!band_rule_found)
886 return !max_bandwidth;
888 EXPORT_SYMBOL(freq_reg_info);
890 int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
891 const struct ieee80211_reg_rule **reg_rule)
893 return freq_reg_info_regd(wiphy, center_freq,
894 bandwidth, reg_rule, NULL);
897 static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
898 unsigned int chan_idx)
902 u32 max_bandwidth = 0;
903 const struct ieee80211_reg_rule *reg_rule = NULL;
904 const struct ieee80211_power_rule *power_rule = NULL;
905 struct ieee80211_supported_band *sband;
906 struct ieee80211_channel *chan;
907 struct wiphy *request_wiphy = NULL;
909 assert_cfg80211_lock();
911 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
913 sband = wiphy->bands[band];
914 BUG_ON(chan_idx >= sband->n_channels);
915 chan = &sband->channels[chan_idx];
917 flags = chan->orig_flags;
919 r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq),
920 &max_bandwidth, ®_rule);
924 * This means no regulatory rule was found in the country IE
925 * with a frequency range on the center_freq's band, since
926 * IEEE-802.11 allows for a country IE to have a subset of the
927 * regulatory information provided in a country we ignore
928 * disabling the channel unless at least one reg rule was
929 * found on the center_freq's band. For details see this
932 * http://tinyurl.com/11d-clarification
935 last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
936 #ifdef CONFIG_CFG80211_REG_DEBUG
937 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
938 "intact on %s - no rule found in band on "
940 chan->center_freq, wiphy_name(wiphy));
944 * In this case we know the country IE has at least one reg rule
945 * for the band so we respect its band definitions
947 #ifdef CONFIG_CFG80211_REG_DEBUG
948 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
949 printk(KERN_DEBUG "cfg80211: Disabling "
950 "channel %d MHz on %s due to "
952 chan->center_freq, wiphy_name(wiphy));
954 flags |= IEEE80211_CHAN_DISABLED;
960 power_rule = ®_rule->power_rule;
962 if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
963 request_wiphy && request_wiphy == wiphy &&
964 request_wiphy->strict_regulatory) {
966 * This gaurantees the driver's requested regulatory domain
967 * will always be used as a base for further regulatory
970 chan->flags = chan->orig_flags =
971 map_regdom_flags(reg_rule->flags);
972 chan->max_antenna_gain = chan->orig_mag =
973 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
974 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
975 chan->max_power = chan->orig_mpwr =
976 (int) MBM_TO_DBM(power_rule->max_eirp);
980 chan->flags = flags | map_regdom_flags(reg_rule->flags);
981 chan->max_antenna_gain = min(chan->orig_mag,
982 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
983 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
985 chan->max_power = min(chan->orig_mpwr,
986 (int) MBM_TO_DBM(power_rule->max_eirp));
988 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
991 static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
994 struct ieee80211_supported_band *sband;
996 BUG_ON(!wiphy->bands[band]);
997 sband = wiphy->bands[band];
999 for (i = 0; i < sband->n_channels; i++)
1000 handle_channel(wiphy, band, i);
1003 static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby)
1007 if (setby == REGDOM_SET_BY_CORE &&
1008 wiphy->custom_regulatory)
1011 * wiphy->regd will be set once the device has its own
1012 * desired regulatory domain set
1014 if (wiphy->strict_regulatory && !wiphy->regd &&
1015 !is_world_regdom(last_request->alpha2))
1020 static void update_all_wiphy_regulatory(enum reg_set_by setby)
1022 struct cfg80211_registered_device *drv;
1024 list_for_each_entry(drv, &cfg80211_drv_list, list)
1025 wiphy_update_regulatory(&drv->wiphy, setby);
1028 static void handle_reg_beacon(struct wiphy *wiphy,
1029 unsigned int chan_idx,
1030 struct reg_beacon *reg_beacon)
1032 #ifdef CONFIG_CFG80211_REG_DEBUG
1033 #define REG_DEBUG_BEACON_FLAG(desc) \
1034 printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \
1035 "frequency: %d MHz (Ch %d) on %s\n", \
1036 reg_beacon->chan.center_freq, \
1037 ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \
1040 #define REG_DEBUG_BEACON_FLAG(desc) do {} while (0)
1042 struct ieee80211_supported_band *sband;
1043 struct ieee80211_channel *chan;
1045 assert_cfg80211_lock();
1047 sband = wiphy->bands[reg_beacon->chan.band];
1048 chan = &sband->channels[chan_idx];
1050 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1053 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
1054 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
1055 REG_DEBUG_BEACON_FLAG("active scanning");
1058 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
1059 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
1060 REG_DEBUG_BEACON_FLAG("beaconing");
1063 chan->beacon_found = true;
1064 #undef REG_DEBUG_BEACON_FLAG
1068 * Called when a scan on a wiphy finds a beacon on
1071 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1072 struct reg_beacon *reg_beacon)
1075 struct ieee80211_supported_band *sband;
1077 assert_cfg80211_lock();
1079 if (!wiphy->bands[reg_beacon->chan.band])
1082 sband = wiphy->bands[reg_beacon->chan.band];
1084 for (i = 0; i < sband->n_channels; i++)
1085 handle_reg_beacon(wiphy, i, reg_beacon);
1089 * Called upon reg changes or a new wiphy is added
1091 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1094 struct ieee80211_supported_band *sband;
1095 struct reg_beacon *reg_beacon;
1097 assert_cfg80211_lock();
1099 if (list_empty(®_beacon_list))
1102 list_for_each_entry(reg_beacon, ®_beacon_list, list) {
1103 if (!wiphy->bands[reg_beacon->chan.band])
1105 sband = wiphy->bands[reg_beacon->chan.band];
1106 for (i = 0; i < sband->n_channels; i++)
1107 handle_reg_beacon(wiphy, i, reg_beacon);
1111 static bool reg_is_world_roaming(struct wiphy *wiphy)
1113 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1114 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1116 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
1117 wiphy->custom_regulatory)
1122 /* Reap the advantages of previously found beacons */
1123 static void reg_process_beacons(struct wiphy *wiphy)
1125 if (!reg_is_world_roaming(wiphy))
1127 wiphy_update_beacon_reg(wiphy);
1130 void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
1132 enum ieee80211_band band;
1134 if (ignore_reg_update(wiphy, setby))
1136 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1137 if (wiphy->bands[band])
1138 handle_band(wiphy, band);
1141 reg_process_beacons(wiphy);
1142 if (wiphy->reg_notifier)
1143 wiphy->reg_notifier(wiphy, last_request);
1146 static void handle_channel_custom(struct wiphy *wiphy,
1147 enum ieee80211_band band,
1148 unsigned int chan_idx,
1149 const struct ieee80211_regdomain *regd)
1152 u32 max_bandwidth = 0;
1153 const struct ieee80211_reg_rule *reg_rule = NULL;
1154 const struct ieee80211_power_rule *power_rule = NULL;
1155 struct ieee80211_supported_band *sband;
1156 struct ieee80211_channel *chan;
1158 sband = wiphy->bands[band];
1159 BUG_ON(chan_idx >= sband->n_channels);
1160 chan = &sband->channels[chan_idx];
1162 r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1163 &max_bandwidth, ®_rule, regd);
1166 chan->flags = IEEE80211_CHAN_DISABLED;
1170 power_rule = ®_rule->power_rule;
1172 chan->flags |= map_regdom_flags(reg_rule->flags);
1173 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1174 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
1175 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1178 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1179 const struct ieee80211_regdomain *regd)
1182 struct ieee80211_supported_band *sband;
1184 BUG_ON(!wiphy->bands[band]);
1185 sband = wiphy->bands[band];
1187 for (i = 0; i < sband->n_channels; i++)
1188 handle_channel_custom(wiphy, band, i, regd);
1191 /* Used by drivers prior to wiphy registration */
1192 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1193 const struct ieee80211_regdomain *regd)
1195 enum ieee80211_band band;
1196 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1197 if (wiphy->bands[band])
1198 handle_band_custom(wiphy, band, regd);
1201 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1203 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
1204 const struct ieee80211_regdomain *src_regd)
1206 struct ieee80211_regdomain *regd;
1207 int size_of_regd = 0;
1210 size_of_regd = sizeof(struct ieee80211_regdomain) +
1211 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
1213 regd = kzalloc(size_of_regd, GFP_KERNEL);
1217 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
1219 for (i = 0; i < src_regd->n_reg_rules; i++)
1220 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
1221 sizeof(struct ieee80211_reg_rule));
1228 * Return value which can be used by ignore_request() to indicate
1229 * it has been determined we should intersect two regulatory domains
1231 #define REG_INTERSECT 1
1233 /* This has the logic which determines when a new request
1234 * should be ignored. */
1235 static int ignore_request(struct wiphy *wiphy,
1236 struct regulatory_request *pending_request)
1238 struct wiphy *last_wiphy = NULL;
1240 assert_cfg80211_lock();
1242 /* All initial requests are respected */
1246 switch (pending_request->initiator) {
1247 case REGDOM_SET_BY_INIT:
1249 case REGDOM_SET_BY_CORE:
1251 case REGDOM_SET_BY_COUNTRY_IE:
1253 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1255 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1257 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
1258 if (last_wiphy != wiphy) {
1260 * Two cards with two APs claiming different
1261 * different Country IE alpha2s. We could
1262 * intersect them, but that seems unlikely
1263 * to be correct. Reject second one for now.
1265 if (regdom_changes(pending_request->alpha2))
1270 * Two consecutive Country IE hints on the same wiphy.
1271 * This should be picked up early by the driver/stack
1273 if (WARN_ON(regdom_changes(pending_request->alpha2)))
1277 return REG_INTERSECT;
1278 case REGDOM_SET_BY_DRIVER:
1279 if (last_request->initiator == REGDOM_SET_BY_CORE) {
1280 if (is_old_static_regdom(cfg80211_regdomain))
1282 if (regdom_changes(pending_request->alpha2))
1288 * This would happen if you unplug and plug your card
1289 * back in or if you add a new device for which the previously
1290 * loaded card also agrees on the regulatory domain.
1292 if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
1293 !regdom_changes(pending_request->alpha2))
1296 return REG_INTERSECT;
1297 case REGDOM_SET_BY_USER:
1298 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
1299 return REG_INTERSECT;
1301 * If the user knows better the user should set the regdom
1302 * to their country before the IE is picked up
1304 if (last_request->initiator == REGDOM_SET_BY_USER &&
1305 last_request->intersect)
1308 * Process user requests only after previous user/driver/core
1309 * requests have been processed
1311 if (last_request->initiator == REGDOM_SET_BY_CORE ||
1312 last_request->initiator == REGDOM_SET_BY_DRIVER ||
1313 last_request->initiator == REGDOM_SET_BY_USER) {
1314 if (regdom_changes(last_request->alpha2))
1318 if (!is_old_static_regdom(cfg80211_regdomain) &&
1319 !regdom_changes(pending_request->alpha2))
1329 * __regulatory_hint - hint to the wireless core a regulatory domain
1330 * @wiphy: if the hint comes from country information from an AP, this
1331 * is required to be set to the wiphy that received the information
1332 * @pending_request: the regulatory request currently being processed
1334 * The Wireless subsystem can use this function to hint to the wireless core
1335 * what it believes should be the current regulatory domain.
1337 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1338 * already been set or other standard error codes.
1340 * Caller must hold &cfg80211_mutex
1342 static int __regulatory_hint(struct wiphy *wiphy,
1343 struct regulatory_request *pending_request)
1345 bool intersect = false;
1348 assert_cfg80211_lock();
1350 r = ignore_request(wiphy, pending_request);
1352 if (r == REG_INTERSECT) {
1353 if (pending_request->initiator == REGDOM_SET_BY_DRIVER) {
1354 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1356 kfree(pending_request);
1363 * If the regulatory domain being requested by the
1364 * driver has already been set just copy it to the
1367 if (r == -EALREADY &&
1368 pending_request->initiator == REGDOM_SET_BY_DRIVER) {
1369 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1371 kfree(pending_request);
1377 kfree(pending_request);
1382 kfree(last_request);
1384 last_request = pending_request;
1385 last_request->intersect = intersect;
1387 pending_request = NULL;
1389 /* When r == REG_INTERSECT we do need to call CRDA */
1394 * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
1395 * AND if CRDA is NOT present nothing will happen, if someone
1396 * wants to bother with 11d with OLD_REG you can add a timer.
1397 * If after x amount of time nothing happens you can call:
1399 * return set_regdom(country_ie_regdomain);
1401 * to intersect with the static rd
1403 return call_crda(last_request->alpha2);
1406 /* This currently only processes user and driver regulatory hints */
1407 static void reg_process_hint(struct regulatory_request *reg_request)
1410 struct wiphy *wiphy = NULL;
1412 BUG_ON(!reg_request->alpha2);
1414 mutex_lock(&cfg80211_mutex);
1416 if (wiphy_idx_valid(reg_request->wiphy_idx))
1417 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1419 if (reg_request->initiator == REGDOM_SET_BY_DRIVER &&
1425 r = __regulatory_hint(wiphy, reg_request);
1426 /* This is required so that the orig_* parameters are saved */
1427 if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
1428 wiphy_update_regulatory(wiphy, reg_request->initiator);
1430 mutex_unlock(&cfg80211_mutex);
1433 /* Processes regulatory hints, this is all the REGDOM_SET_BY_* */
1434 static void reg_process_pending_hints(void)
1436 struct regulatory_request *reg_request;
1438 spin_lock(®_requests_lock);
1439 while (!list_empty(®_requests_list)) {
1440 reg_request = list_first_entry(®_requests_list,
1441 struct regulatory_request,
1443 list_del_init(®_request->list);
1445 spin_unlock(®_requests_lock);
1446 reg_process_hint(reg_request);
1447 spin_lock(®_requests_lock);
1449 spin_unlock(®_requests_lock);
1452 /* Processes beacon hints -- this has nothing to do with country IEs */
1453 static void reg_process_pending_beacon_hints(void)
1455 struct cfg80211_registered_device *drv;
1456 struct reg_beacon *pending_beacon, *tmp;
1458 mutex_lock(&cfg80211_mutex);
1460 /* This goes through the _pending_ beacon list */
1461 spin_lock_bh(®_pending_beacons_lock);
1463 if (list_empty(®_pending_beacons)) {
1464 spin_unlock_bh(®_pending_beacons_lock);
1468 list_for_each_entry_safe(pending_beacon, tmp,
1469 ®_pending_beacons, list) {
1471 list_del_init(&pending_beacon->list);
1473 /* Applies the beacon hint to current wiphys */
1474 list_for_each_entry(drv, &cfg80211_drv_list, list)
1475 wiphy_update_new_beacon(&drv->wiphy, pending_beacon);
1477 /* Remembers the beacon hint for new wiphys or reg changes */
1478 list_add_tail(&pending_beacon->list, ®_beacon_list);
1481 spin_unlock_bh(®_pending_beacons_lock);
1483 mutex_unlock(&cfg80211_mutex);
1486 static void reg_todo(struct work_struct *work)
1488 reg_process_pending_hints();
1489 reg_process_pending_beacon_hints();
1492 static DECLARE_WORK(reg_work, reg_todo);
1494 static void queue_regulatory_request(struct regulatory_request *request)
1496 spin_lock(®_requests_lock);
1497 list_add_tail(&request->list, ®_requests_list);
1498 spin_unlock(®_requests_lock);
1500 schedule_work(®_work);
1503 /* Core regulatory hint -- happens once during cfg80211_init() */
1504 static int regulatory_hint_core(const char *alpha2)
1506 struct regulatory_request *request;
1508 BUG_ON(last_request);
1510 request = kzalloc(sizeof(struct regulatory_request),
1515 request->alpha2[0] = alpha2[0];
1516 request->alpha2[1] = alpha2[1];
1517 request->initiator = REGDOM_SET_BY_CORE;
1519 queue_regulatory_request(request);
1525 int regulatory_hint_user(const char *alpha2)
1527 struct regulatory_request *request;
1531 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1535 request->wiphy_idx = WIPHY_IDX_STALE;
1536 request->alpha2[0] = alpha2[0];
1537 request->alpha2[1] = alpha2[1];
1538 request->initiator = REGDOM_SET_BY_USER,
1540 queue_regulatory_request(request);
1546 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1548 struct regulatory_request *request;
1553 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1557 request->wiphy_idx = get_wiphy_idx(wiphy);
1559 /* Must have registered wiphy first */
1560 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1562 request->alpha2[0] = alpha2[0];
1563 request->alpha2[1] = alpha2[1];
1564 request->initiator = REGDOM_SET_BY_DRIVER;
1566 queue_regulatory_request(request);
1570 EXPORT_SYMBOL(regulatory_hint);
1572 static bool reg_same_country_ie_hint(struct wiphy *wiphy,
1573 u32 country_ie_checksum)
1575 struct wiphy *request_wiphy;
1577 assert_cfg80211_lock();
1579 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1584 if (likely(request_wiphy != wiphy))
1585 return !country_ie_integrity_changes(country_ie_checksum);
1587 * We should not have let these through at this point, they
1588 * should have been picked up earlier by the first alpha2 check
1591 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
1596 void regulatory_hint_11d(struct wiphy *wiphy,
1600 struct ieee80211_regdomain *rd = NULL;
1603 enum environment_cap env = ENVIRON_ANY;
1604 struct regulatory_request *request;
1606 mutex_lock(&cfg80211_mutex);
1608 if (unlikely(!last_request)) {
1609 mutex_unlock(&cfg80211_mutex);
1613 /* IE len must be evenly divisible by 2 */
1614 if (country_ie_len & 0x01)
1617 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1621 * Pending country IE processing, this can happen after we
1622 * call CRDA and wait for a response if a beacon was received before
1623 * we were able to process the last regulatory_hint_11d() call
1625 if (country_ie_regdomain)
1628 alpha2[0] = country_ie[0];
1629 alpha2[1] = country_ie[1];
1631 if (country_ie[2] == 'I')
1632 env = ENVIRON_INDOOR;
1633 else if (country_ie[2] == 'O')
1634 env = ENVIRON_OUTDOOR;
1637 * We will run this for *every* beacon processed for the BSSID, so
1638 * we optimize an early check to exit out early if we don't have to
1641 if (likely(wiphy_idx_valid(last_request->wiphy_idx))) {
1642 struct cfg80211_registered_device *drv_last_ie;
1645 cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx);
1648 * Lets keep this simple -- we trust the first AP
1649 * after we intersect with CRDA
1651 if (likely(&drv_last_ie->wiphy == wiphy)) {
1653 * Ignore IEs coming in on this wiphy with
1654 * the same alpha2 and environment cap
1656 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1658 env == drv_last_ie->env)) {
1662 * the wiphy moved on to another BSSID or the AP
1663 * was reconfigured. XXX: We need to deal with the
1664 * case where the user suspends and goes to goes
1665 * to another country, and then gets IEs from an
1666 * AP with different settings
1671 * Ignore IEs coming in on two separate wiphys with
1672 * the same alpha2 and environment cap
1674 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1676 env == drv_last_ie->env)) {
1679 /* We could potentially intersect though */
1684 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
1689 * This will not happen right now but we leave it here for the
1690 * the future when we want to add suspend/resume support and having
1691 * the user move to another country after doing so, or having the user
1692 * move to another AP. Right now we just trust the first AP.
1694 * If we hit this before we add this support we want to be informed of
1695 * it as it would indicate a mistake in the current design
1697 if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))
1700 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1705 * We keep this around for when CRDA comes back with a response so
1706 * we can intersect with that
1708 country_ie_regdomain = rd;
1710 request->wiphy_idx = get_wiphy_idx(wiphy);
1711 request->alpha2[0] = rd->alpha2[0];
1712 request->alpha2[1] = rd->alpha2[1];
1713 request->initiator = REGDOM_SET_BY_COUNTRY_IE;
1714 request->country_ie_checksum = checksum;
1715 request->country_ie_env = env;
1717 mutex_unlock(&cfg80211_mutex);
1719 queue_regulatory_request(request);
1726 mutex_unlock(&cfg80211_mutex);
1728 EXPORT_SYMBOL(regulatory_hint_11d);
1730 static bool freq_is_chan_12_13_14(u16 freq)
1732 if (freq == ieee80211_channel_to_frequency(12) ||
1733 freq == ieee80211_channel_to_frequency(13) ||
1734 freq == ieee80211_channel_to_frequency(14))
1739 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1740 struct ieee80211_channel *beacon_chan,
1743 struct reg_beacon *reg_beacon;
1745 if (likely((beacon_chan->beacon_found ||
1746 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1747 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1748 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1751 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1755 #ifdef CONFIG_CFG80211_REG_DEBUG
1756 printk(KERN_DEBUG "cfg80211: Found new beacon on "
1757 "frequency: %d MHz (Ch %d) on %s\n",
1758 beacon_chan->center_freq,
1759 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1762 memcpy(®_beacon->chan, beacon_chan,
1763 sizeof(struct ieee80211_channel));
1767 * Since we can be called from BH or and non-BH context
1768 * we must use spin_lock_bh()
1770 spin_lock_bh(®_pending_beacons_lock);
1771 list_add_tail(®_beacon->list, ®_pending_beacons);
1772 spin_unlock_bh(®_pending_beacons_lock);
1774 schedule_work(®_work);
1779 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1782 const struct ieee80211_reg_rule *reg_rule = NULL;
1783 const struct ieee80211_freq_range *freq_range = NULL;
1784 const struct ieee80211_power_rule *power_rule = NULL;
1786 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
1787 "(max_antenna_gain, max_eirp)\n");
1789 for (i = 0; i < rd->n_reg_rules; i++) {
1790 reg_rule = &rd->reg_rules[i];
1791 freq_range = ®_rule->freq_range;
1792 power_rule = ®_rule->power_rule;
1795 * There may not be documentation for max antenna gain
1796 * in certain regions
1798 if (power_rule->max_antenna_gain)
1799 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1800 "(%d mBi, %d mBm)\n",
1801 freq_range->start_freq_khz,
1802 freq_range->end_freq_khz,
1803 freq_range->max_bandwidth_khz,
1804 power_rule->max_antenna_gain,
1805 power_rule->max_eirp);
1807 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1809 freq_range->start_freq_khz,
1810 freq_range->end_freq_khz,
1811 freq_range->max_bandwidth_khz,
1812 power_rule->max_eirp);
1816 static void print_regdomain(const struct ieee80211_regdomain *rd)
1819 if (is_intersected_alpha2(rd->alpha2)) {
1821 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
1822 struct cfg80211_registered_device *drv;
1823 drv = cfg80211_drv_by_wiphy_idx(
1824 last_request->wiphy_idx);
1826 printk(KERN_INFO "cfg80211: Current regulatory "
1827 "domain updated by AP to: %c%c\n",
1828 drv->country_ie_alpha2[0],
1829 drv->country_ie_alpha2[1]);
1831 printk(KERN_INFO "cfg80211: Current regulatory "
1832 "domain intersected: \n");
1834 printk(KERN_INFO "cfg80211: Current regulatory "
1835 "domain intersected: \n");
1836 } else if (is_world_regdom(rd->alpha2))
1837 printk(KERN_INFO "cfg80211: World regulatory "
1838 "domain updated:\n");
1840 if (is_unknown_alpha2(rd->alpha2))
1841 printk(KERN_INFO "cfg80211: Regulatory domain "
1842 "changed to driver built-in settings "
1843 "(unknown country)\n");
1845 printk(KERN_INFO "cfg80211: Regulatory domain "
1846 "changed to country: %c%c\n",
1847 rd->alpha2[0], rd->alpha2[1]);
1852 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1854 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1855 rd->alpha2[0], rd->alpha2[1]);
1859 #ifdef CONFIG_CFG80211_REG_DEBUG
1860 static void reg_country_ie_process_debug(
1861 const struct ieee80211_regdomain *rd,
1862 const struct ieee80211_regdomain *country_ie_regdomain,
1863 const struct ieee80211_regdomain *intersected_rd)
1865 printk(KERN_DEBUG "cfg80211: Received country IE:\n");
1866 print_regdomain_info(country_ie_regdomain);
1867 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
1868 print_regdomain_info(rd);
1869 if (intersected_rd) {
1870 printk(KERN_DEBUG "cfg80211: We intersect both of these "
1872 print_regdomain_info(intersected_rd);
1875 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
1878 static inline void reg_country_ie_process_debug(
1879 const struct ieee80211_regdomain *rd,
1880 const struct ieee80211_regdomain *country_ie_regdomain,
1881 const struct ieee80211_regdomain *intersected_rd)
1886 /* Takes ownership of rd only if it doesn't fail */
1887 static int __set_regdom(const struct ieee80211_regdomain *rd)
1889 const struct ieee80211_regdomain *intersected_rd = NULL;
1890 struct cfg80211_registered_device *drv = NULL;
1891 struct wiphy *request_wiphy;
1892 /* Some basic sanity checks first */
1894 if (is_world_regdom(rd->alpha2)) {
1895 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1897 update_world_regdomain(rd);
1901 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1902 !is_unknown_alpha2(rd->alpha2))
1909 * Lets only bother proceeding on the same alpha2 if the current
1910 * rd is non static (it means CRDA was present and was used last)
1911 * and the pending request came in from a country IE
1913 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1915 * If someone else asked us to change the rd lets only bother
1916 * checking if the alpha2 changes if CRDA was already called
1918 if (!is_old_static_regdom(cfg80211_regdomain) &&
1919 !regdom_changes(rd->alpha2))
1924 * Now lets set the regulatory domain, update all driver channels
1925 * and finally inform them of what we have done, in case they want
1926 * to review or adjust their own settings based on their own
1927 * internal EEPROM data
1930 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1933 if (!is_valid_rd(rd)) {
1934 printk(KERN_ERR "cfg80211: Invalid "
1935 "regulatory domain detected:\n");
1936 print_regdomain_info(rd);
1940 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1942 if (!last_request->intersect) {
1945 if (last_request->initiator != REGDOM_SET_BY_DRIVER) {
1947 cfg80211_regdomain = rd;
1952 * For a driver hint, lets copy the regulatory domain the
1953 * driver wanted to the wiphy to deal with conflicts
1956 BUG_ON(request_wiphy->regd);
1958 r = reg_copy_regd(&request_wiphy->regd, rd);
1963 cfg80211_regdomain = rd;
1967 /* Intersection requires a bit more work */
1969 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1971 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1972 if (!intersected_rd)
1976 * We can trash what CRDA provided now.
1977 * However if a driver requested this specific regulatory
1978 * domain we keep it for its private use
1980 if (last_request->initiator == REGDOM_SET_BY_DRIVER)
1981 request_wiphy->regd = rd;
1988 cfg80211_regdomain = intersected_rd;
1994 * Country IE requests are handled a bit differently, we intersect
1995 * the country IE rd with what CRDA believes that country should have
1998 BUG_ON(!country_ie_regdomain);
2000 if (rd != country_ie_regdomain) {
2002 * Intersect what CRDA returned and our what we
2003 * had built from the Country IE received
2006 intersected_rd = regdom_intersect(rd, country_ie_regdomain);
2008 reg_country_ie_process_debug(rd, country_ie_regdomain,
2011 kfree(country_ie_regdomain);
2012 country_ie_regdomain = NULL;
2015 * This would happen when CRDA was not present and
2016 * OLD_REGULATORY was enabled. We intersect our Country
2017 * IE rd and what was set on cfg80211 originally
2019 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2022 if (!intersected_rd)
2025 drv = wiphy_to_dev(request_wiphy);
2027 drv->country_ie_alpha2[0] = rd->alpha2[0];
2028 drv->country_ie_alpha2[1] = rd->alpha2[1];
2029 drv->env = last_request->country_ie_env;
2031 BUG_ON(intersected_rd == rd);
2037 cfg80211_regdomain = intersected_rd;
2044 * Use this call to set the current regulatory domain. Conflicts with
2045 * multiple drivers can be ironed out later. Caller must've already
2046 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2048 int set_regdom(const struct ieee80211_regdomain *rd)
2052 assert_cfg80211_lock();
2054 /* Note that this doesn't update the wiphys, this is done below */
2055 r = __set_regdom(rd);
2061 /* This would make this whole thing pointless */
2062 if (!last_request->intersect)
2063 BUG_ON(rd != cfg80211_regdomain);
2065 /* update all wiphys now with the new established regulatory domain */
2066 update_all_wiphy_regulatory(last_request->initiator);
2068 print_regdomain(cfg80211_regdomain);
2073 /* Caller must hold cfg80211_mutex */
2074 void reg_device_remove(struct wiphy *wiphy)
2076 struct wiphy *request_wiphy;
2078 assert_cfg80211_lock();
2080 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2083 if (!last_request || !request_wiphy)
2085 if (request_wiphy != wiphy)
2087 last_request->wiphy_idx = WIPHY_IDX_STALE;
2088 last_request->country_ie_env = ENVIRON_ANY;
2091 int regulatory_init(void)
2095 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2096 if (IS_ERR(reg_pdev))
2097 return PTR_ERR(reg_pdev);
2099 spin_lock_init(®_requests_lock);
2100 spin_lock_init(®_pending_beacons_lock);
2102 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
2103 cfg80211_regdomain = static_regdom(ieee80211_regdom);
2105 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
2106 print_regdomain_info(cfg80211_regdomain);
2108 * The old code still requests for a new regdomain and if
2109 * you have CRDA you get it updated, otherwise you get
2110 * stuck with the static values. We ignore "EU" code as
2111 * that is not a valid ISO / IEC 3166 alpha2
2113 if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
2114 err = regulatory_hint_core(ieee80211_regdom);
2116 cfg80211_regdomain = cfg80211_world_regdom;
2118 err = regulatory_hint_core("00");
2124 * N.B. kobject_uevent_env() can fail mainly for when we're out
2125 * memory which is handled and propagated appropriately above
2126 * but it can also fail during a netlink_broadcast() or during
2127 * early boot for call_usermodehelper(). For now treat these
2128 * errors as non-fatal.
2130 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
2131 "to call CRDA during init");
2132 #ifdef CONFIG_CFG80211_REG_DEBUG
2133 /* We want to find out exactly why when debugging */
2141 void regulatory_exit(void)
2143 struct regulatory_request *reg_request, *tmp;
2144 struct reg_beacon *reg_beacon, *btmp;
2146 cancel_work_sync(®_work);
2148 mutex_lock(&cfg80211_mutex);
2152 kfree(country_ie_regdomain);
2153 country_ie_regdomain = NULL;
2155 kfree(last_request);
2157 platform_device_unregister(reg_pdev);
2159 spin_lock_bh(®_pending_beacons_lock);
2160 if (!list_empty(®_pending_beacons)) {
2161 list_for_each_entry_safe(reg_beacon, btmp,
2162 ®_pending_beacons, list) {
2163 list_del(®_beacon->list);
2167 spin_unlock_bh(®_pending_beacons_lock);
2169 if (!list_empty(®_beacon_list)) {
2170 list_for_each_entry_safe(reg_beacon, btmp,
2171 ®_beacon_list, list) {
2172 list_del(®_beacon->list);
2177 spin_lock(®_requests_lock);
2178 if (!list_empty(®_requests_list)) {
2179 list_for_each_entry_safe(reg_request, tmp,
2180 ®_requests_list, list) {
2181 list_del(®_request->list);
2185 spin_unlock(®_requests_lock);
2187 mutex_unlock(&cfg80211_mutex);