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 static LIST_HEAD(reg_requests_list);
72 static spinlock_t reg_requests_lock;
74 /* We keep a static world regulatory domain in case of the absence of CRDA */
75 static const struct ieee80211_regdomain world_regdom = {
79 /* IEEE 802.11b/g, channels 1..11 */
80 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
81 /* IEEE 802.11a, channel 36..48 */
82 REG_RULE(5180-10, 5240+10, 40, 6, 23,
83 NL80211_RRF_PASSIVE_SCAN |
86 /* NB: 5260 MHz - 5700 MHz requies DFS */
88 /* IEEE 802.11a, channel 149..165 */
89 REG_RULE(5745-10, 5825+10, 40, 6, 23,
90 NL80211_RRF_PASSIVE_SCAN |
95 static const struct ieee80211_regdomain *cfg80211_world_regdom =
98 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
99 static char *ieee80211_regdom = "US";
100 module_param(ieee80211_regdom, charp, 0444);
101 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
104 * We assume 40 MHz bandwidth for the old regulatory work.
105 * We make emphasis we are using the exact same frequencies
109 static const struct ieee80211_regdomain us_regdom = {
113 /* IEEE 802.11b/g, channels 1..11 */
114 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
115 /* IEEE 802.11a, channel 36 */
116 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
117 /* IEEE 802.11a, channel 40 */
118 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
119 /* IEEE 802.11a, channel 44 */
120 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
121 /* IEEE 802.11a, channels 48..64 */
122 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
123 /* IEEE 802.11a, channels 149..165, outdoor */
124 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
128 static const struct ieee80211_regdomain jp_regdom = {
132 /* IEEE 802.11b/g, channels 1..14 */
133 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
134 /* IEEE 802.11a, channels 34..48 */
135 REG_RULE(5170-10, 5240+10, 40, 6, 20,
136 NL80211_RRF_PASSIVE_SCAN),
137 /* IEEE 802.11a, channels 52..64 */
138 REG_RULE(5260-10, 5320+10, 40, 6, 20,
139 NL80211_RRF_NO_IBSS |
144 static const struct ieee80211_regdomain eu_regdom = {
147 * This alpha2 is bogus, we leave it here just for stupid
148 * backward compatibility
152 /* IEEE 802.11b/g, channels 1..13 */
153 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
154 /* IEEE 802.11a, channel 36 */
155 REG_RULE(5180-10, 5180+10, 40, 6, 23,
156 NL80211_RRF_PASSIVE_SCAN),
157 /* IEEE 802.11a, channel 40 */
158 REG_RULE(5200-10, 5200+10, 40, 6, 23,
159 NL80211_RRF_PASSIVE_SCAN),
160 /* IEEE 802.11a, channel 44 */
161 REG_RULE(5220-10, 5220+10, 40, 6, 23,
162 NL80211_RRF_PASSIVE_SCAN),
163 /* IEEE 802.11a, channels 48..64 */
164 REG_RULE(5240-10, 5320+10, 40, 6, 20,
165 NL80211_RRF_NO_IBSS |
167 /* IEEE 802.11a, channels 100..140 */
168 REG_RULE(5500-10, 5700+10, 40, 6, 30,
169 NL80211_RRF_NO_IBSS |
174 static const struct ieee80211_regdomain *static_regdom(char *alpha2)
176 if (alpha2[0] == 'U' && alpha2[1] == 'S')
178 if (alpha2[0] == 'J' && alpha2[1] == 'P')
180 if (alpha2[0] == 'E' && alpha2[1] == 'U')
182 /* Default, as per the old rules */
186 static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
188 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
193 static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
199 static void reset_regdomains(void)
201 /* avoid freeing static information or freeing something twice */
202 if (cfg80211_regdomain == cfg80211_world_regdom)
203 cfg80211_regdomain = NULL;
204 if (cfg80211_world_regdom == &world_regdom)
205 cfg80211_world_regdom = NULL;
206 if (cfg80211_regdomain == &world_regdom)
207 cfg80211_regdomain = NULL;
208 if (is_old_static_regdom(cfg80211_regdomain))
209 cfg80211_regdomain = NULL;
211 kfree(cfg80211_regdomain);
212 kfree(cfg80211_world_regdom);
214 cfg80211_world_regdom = &world_regdom;
215 cfg80211_regdomain = NULL;
219 * Dynamic world regulatory domain requested by the wireless
220 * core upon initialization
222 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
224 BUG_ON(!last_request);
228 cfg80211_world_regdom = rd;
229 cfg80211_regdomain = rd;
232 bool is_world_regdom(const char *alpha2)
236 if (alpha2[0] == '0' && alpha2[1] == '0')
241 static bool is_alpha2_set(const char *alpha2)
245 if (alpha2[0] != 0 && alpha2[1] != 0)
250 static bool is_alpha_upper(char letter)
253 if (letter >= 65 && letter <= 90)
258 static bool is_unknown_alpha2(const char *alpha2)
263 * Special case where regulatory domain was built by driver
264 * but a specific alpha2 cannot be determined
266 if (alpha2[0] == '9' && alpha2[1] == '9')
271 static bool is_intersected_alpha2(const char *alpha2)
276 * Special case where regulatory domain is the
277 * result of an intersection between two regulatory domain
280 if (alpha2[0] == '9' && alpha2[1] == '8')
285 static bool is_an_alpha2(const char *alpha2)
289 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
294 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
296 if (!alpha2_x || !alpha2_y)
298 if (alpha2_x[0] == alpha2_y[0] &&
299 alpha2_x[1] == alpha2_y[1])
304 static bool regdom_changes(const char *alpha2)
306 assert_cfg80211_lock();
308 if (!cfg80211_regdomain)
310 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
316 * country_ie_integrity_changes - tells us if the country IE has changed
317 * @checksum: checksum of country IE of fields we are interested in
319 * If the country IE has not changed you can ignore it safely. This is
320 * useful to determine if two devices are seeing two different country IEs
321 * even on the same alpha2. Note that this will return false if no IE has
322 * been set on the wireless core yet.
324 static bool country_ie_integrity_changes(u32 checksum)
326 /* If no IE has been set then the checksum doesn't change */
327 if (unlikely(!last_request->country_ie_checksum))
329 if (unlikely(last_request->country_ie_checksum != checksum))
335 * This lets us keep regulatory code which is updated on a regulatory
336 * basis in userspace.
338 static int call_crda(const char *alpha2)
340 char country_env[9 + 2] = "COUNTRY=";
346 if (!is_world_regdom((char *) alpha2))
347 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
348 alpha2[0], alpha2[1]);
350 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
351 "regulatory domain\n");
353 country_env[8] = alpha2[0];
354 country_env[9] = alpha2[1];
356 return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp);
359 /* Used by nl80211 before kmalloc'ing our regulatory domain */
360 bool reg_is_valid_request(const char *alpha2)
365 return alpha2_equal(last_request->alpha2, alpha2);
368 /* Sanity check on a regulatory rule */
369 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
371 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
374 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
377 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
380 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
382 if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff)
388 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
390 const struct ieee80211_reg_rule *reg_rule = NULL;
393 if (!rd->n_reg_rules)
396 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
399 for (i = 0; i < rd->n_reg_rules; i++) {
400 reg_rule = &rd->reg_rules[i];
401 if (!is_valid_reg_rule(reg_rule))
408 /* Returns value in KHz */
409 static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
413 for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
414 u32 start_freq_khz = freq - supported_bandwidths[i]/2;
415 u32 end_freq_khz = freq + supported_bandwidths[i]/2;
416 if (start_freq_khz >= freq_range->start_freq_khz &&
417 end_freq_khz <= freq_range->end_freq_khz)
418 return supported_bandwidths[i];
424 * freq_in_rule_band - tells us if a frequency is in a frequency band
425 * @freq_range: frequency rule we want to query
426 * @freq_khz: frequency we are inquiring about
428 * This lets us know if a specific frequency rule is or is not relevant to
429 * a specific frequency's band. Bands are device specific and artificial
430 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
431 * safe for now to assume that a frequency rule should not be part of a
432 * frequency's band if the start freq or end freq are off by more than 2 GHz.
433 * This resolution can be lowered and should be considered as we add
434 * regulatory rule support for other "bands".
436 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
439 #define ONE_GHZ_IN_KHZ 1000000
440 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
442 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
445 #undef ONE_GHZ_IN_KHZ
449 * Converts a country IE to a regulatory domain. A regulatory domain
450 * structure has a lot of information which the IE doesn't yet have,
451 * so for the other values we use upper max values as we will intersect
452 * with our userspace regulatory agent to get lower bounds.
454 static struct ieee80211_regdomain *country_ie_2_rd(
459 struct ieee80211_regdomain *rd = NULL;
463 u32 num_rules = 0, size_of_regd = 0;
464 u8 *triplets_start = NULL;
465 u8 len_at_triplet = 0;
466 /* the last channel we have registered in a subband (triplet) */
467 int last_sub_max_channel = 0;
469 *checksum = 0xDEADBEEF;
471 /* Country IE requirements */
472 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
473 country_ie_len & 0x01);
475 alpha2[0] = country_ie[0];
476 alpha2[1] = country_ie[1];
479 * Third octet can be:
483 * anything else we assume is no restrictions
485 if (country_ie[2] == 'I')
486 flags = NL80211_RRF_NO_OUTDOOR;
487 else if (country_ie[2] == 'O')
488 flags = NL80211_RRF_NO_INDOOR;
493 triplets_start = country_ie;
494 len_at_triplet = country_ie_len;
496 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
499 * We need to build a reg rule for each triplet, but first we must
500 * calculate the number of reg rules we will need. We will need one
501 * for each channel subband
503 while (country_ie_len >= 3) {
505 struct ieee80211_country_ie_triplet *triplet =
506 (struct ieee80211_country_ie_triplet *) country_ie;
507 int cur_sub_max_channel = 0, cur_channel = 0;
509 if (triplet->ext.reg_extension_id >=
510 IEEE80211_COUNTRY_EXTENSION_ID) {
517 if (triplet->chans.first_channel <= 14)
518 end_channel = triplet->chans.first_channel +
519 triplet->chans.num_channels;
522 * 5 GHz -- For example in country IEs if the first
523 * channel given is 36 and the number of channels is 4
524 * then the individual channel numbers defined for the
525 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
526 * and not 36, 37, 38, 39.
528 * See: http://tinyurl.com/11d-clarification
530 end_channel = triplet->chans.first_channel +
531 (4 * (triplet->chans.num_channels - 1));
533 cur_channel = triplet->chans.first_channel;
534 cur_sub_max_channel = end_channel;
536 /* Basic sanity check */
537 if (cur_sub_max_channel < cur_channel)
541 * Do not allow overlapping channels. Also channels
542 * passed in each subband must be monotonically
545 if (last_sub_max_channel) {
546 if (cur_channel <= last_sub_max_channel)
548 if (cur_sub_max_channel <= last_sub_max_channel)
553 * When dot11RegulatoryClassesRequired is supported
554 * we can throw ext triplets as part of this soup,
555 * for now we don't care when those change as we
558 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
559 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
560 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
562 last_sub_max_channel = cur_sub_max_channel;
569 * Note: this is not a IEEE requirement but
570 * simply a memory requirement
572 if (num_rules > NL80211_MAX_SUPP_REG_RULES)
576 country_ie = triplets_start;
577 country_ie_len = len_at_triplet;
579 size_of_regd = sizeof(struct ieee80211_regdomain) +
580 (num_rules * sizeof(struct ieee80211_reg_rule));
582 rd = kzalloc(size_of_regd, GFP_KERNEL);
586 rd->n_reg_rules = num_rules;
587 rd->alpha2[0] = alpha2[0];
588 rd->alpha2[1] = alpha2[1];
590 /* This time around we fill in the rd */
591 while (country_ie_len >= 3) {
593 struct ieee80211_country_ie_triplet *triplet =
594 (struct ieee80211_country_ie_triplet *) country_ie;
595 struct ieee80211_reg_rule *reg_rule = NULL;
596 struct ieee80211_freq_range *freq_range = NULL;
597 struct ieee80211_power_rule *power_rule = NULL;
600 * Must parse if dot11RegulatoryClassesRequired is true,
601 * we don't support this yet
603 if (triplet->ext.reg_extension_id >=
604 IEEE80211_COUNTRY_EXTENSION_ID) {
610 reg_rule = &rd->reg_rules[i];
611 freq_range = ®_rule->freq_range;
612 power_rule = ®_rule->power_rule;
614 reg_rule->flags = flags;
617 if (triplet->chans.first_channel <= 14)
618 end_channel = triplet->chans.first_channel +
619 triplet->chans.num_channels;
621 end_channel = triplet->chans.first_channel +
622 (4 * (triplet->chans.num_channels - 1));
625 * The +10 is since the regulatory domain expects
626 * the actual band edge, not the center of freq for
627 * its start and end freqs, assuming 20 MHz bandwidth on
628 * the channels passed
630 freq_range->start_freq_khz =
631 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
632 triplet->chans.first_channel) - 10);
633 freq_range->end_freq_khz =
634 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
638 * These are large arbitrary values we use to intersect later.
639 * Increment this if we ever support >= 40 MHz channels
642 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
643 power_rule->max_antenna_gain = DBI_TO_MBI(100);
644 power_rule->max_eirp = DBM_TO_MBM(100);
650 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
658 * Helper for regdom_intersect(), this does the real
659 * mathematical intersection fun
661 static int reg_rules_intersect(
662 const struct ieee80211_reg_rule *rule1,
663 const struct ieee80211_reg_rule *rule2,
664 struct ieee80211_reg_rule *intersected_rule)
666 const struct ieee80211_freq_range *freq_range1, *freq_range2;
667 struct ieee80211_freq_range *freq_range;
668 const struct ieee80211_power_rule *power_rule1, *power_rule2;
669 struct ieee80211_power_rule *power_rule;
672 freq_range1 = &rule1->freq_range;
673 freq_range2 = &rule2->freq_range;
674 freq_range = &intersected_rule->freq_range;
676 power_rule1 = &rule1->power_rule;
677 power_rule2 = &rule2->power_rule;
678 power_rule = &intersected_rule->power_rule;
680 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
681 freq_range2->start_freq_khz);
682 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
683 freq_range2->end_freq_khz);
684 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
685 freq_range2->max_bandwidth_khz);
687 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
688 if (freq_range->max_bandwidth_khz > freq_diff)
689 freq_range->max_bandwidth_khz = freq_diff;
691 power_rule->max_eirp = min(power_rule1->max_eirp,
692 power_rule2->max_eirp);
693 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
694 power_rule2->max_antenna_gain);
696 intersected_rule->flags = (rule1->flags | rule2->flags);
698 if (!is_valid_reg_rule(intersected_rule))
705 * regdom_intersect - do the intersection between two regulatory domains
706 * @rd1: first regulatory domain
707 * @rd2: second regulatory domain
709 * Use this function to get the intersection between two regulatory domains.
710 * Once completed we will mark the alpha2 for the rd as intersected, "98",
711 * as no one single alpha2 can represent this regulatory domain.
713 * Returns a pointer to the regulatory domain structure which will hold the
714 * resulting intersection of rules between rd1 and rd2. We will
715 * kzalloc() this structure for you.
717 static struct ieee80211_regdomain *regdom_intersect(
718 const struct ieee80211_regdomain *rd1,
719 const struct ieee80211_regdomain *rd2)
723 unsigned int num_rules = 0, rule_idx = 0;
724 const struct ieee80211_reg_rule *rule1, *rule2;
725 struct ieee80211_reg_rule *intersected_rule;
726 struct ieee80211_regdomain *rd;
727 /* This is just a dummy holder to help us count */
728 struct ieee80211_reg_rule irule;
730 /* Uses the stack temporarily for counter arithmetic */
731 intersected_rule = &irule;
733 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
739 * First we get a count of the rules we'll need, then we actually
740 * build them. This is to so we can malloc() and free() a
741 * regdomain once. The reason we use reg_rules_intersect() here
742 * is it will return -EINVAL if the rule computed makes no sense.
743 * All rules that do check out OK are valid.
746 for (x = 0; x < rd1->n_reg_rules; x++) {
747 rule1 = &rd1->reg_rules[x];
748 for (y = 0; y < rd2->n_reg_rules; y++) {
749 rule2 = &rd2->reg_rules[y];
750 if (!reg_rules_intersect(rule1, rule2,
753 memset(intersected_rule, 0,
754 sizeof(struct ieee80211_reg_rule));
761 size_of_regd = sizeof(struct ieee80211_regdomain) +
762 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
764 rd = kzalloc(size_of_regd, GFP_KERNEL);
768 for (x = 0; x < rd1->n_reg_rules; x++) {
769 rule1 = &rd1->reg_rules[x];
770 for (y = 0; y < rd2->n_reg_rules; y++) {
771 rule2 = &rd2->reg_rules[y];
773 * This time around instead of using the stack lets
774 * write to the target rule directly saving ourselves
777 intersected_rule = &rd->reg_rules[rule_idx];
778 r = reg_rules_intersect(rule1, rule2,
781 * No need to memset here the intersected rule here as
782 * we're not using the stack anymore
790 if (rule_idx != num_rules) {
795 rd->n_reg_rules = num_rules;
803 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
804 * want to just have the channel structure use these
806 static u32 map_regdom_flags(u32 rd_flags)
808 u32 channel_flags = 0;
809 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
810 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
811 if (rd_flags & NL80211_RRF_NO_IBSS)
812 channel_flags |= IEEE80211_CHAN_NO_IBSS;
813 if (rd_flags & NL80211_RRF_DFS)
814 channel_flags |= IEEE80211_CHAN_RADAR;
815 return channel_flags;
818 static int freq_reg_info_regd(struct wiphy *wiphy,
821 const struct ieee80211_reg_rule **reg_rule,
822 const struct ieee80211_regdomain *custom_regd)
825 bool band_rule_found = false;
826 const struct ieee80211_regdomain *regd;
827 u32 max_bandwidth = 0;
829 regd = custom_regd ? custom_regd : cfg80211_regdomain;
832 * Follow the driver's regulatory domain, if present, unless a country
833 * IE has been processed or a user wants to help complaince further
835 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
836 last_request->initiator != REGDOM_SET_BY_USER &&
843 for (i = 0; i < regd->n_reg_rules; i++) {
844 const struct ieee80211_reg_rule *rr;
845 const struct ieee80211_freq_range *fr = NULL;
846 const struct ieee80211_power_rule *pr = NULL;
848 rr = ®d->reg_rules[i];
849 fr = &rr->freq_range;
850 pr = &rr->power_rule;
853 * We only need to know if one frequency rule was
854 * was in center_freq's band, that's enough, so lets
855 * not overwrite it once found
857 if (!band_rule_found)
858 band_rule_found = freq_in_rule_band(fr, center_freq);
860 max_bandwidth = freq_max_bandwidth(fr, center_freq);
862 if (max_bandwidth && *bandwidth <= max_bandwidth) {
864 *bandwidth = max_bandwidth;
869 if (!band_rule_found)
872 return !max_bandwidth;
874 EXPORT_SYMBOL(freq_reg_info);
876 int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
877 const struct ieee80211_reg_rule **reg_rule)
879 return freq_reg_info_regd(wiphy, center_freq,
880 bandwidth, reg_rule, NULL);
883 static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
884 unsigned int chan_idx)
888 u32 max_bandwidth = 0;
889 const struct ieee80211_reg_rule *reg_rule = NULL;
890 const struct ieee80211_power_rule *power_rule = NULL;
891 struct ieee80211_supported_band *sband;
892 struct ieee80211_channel *chan;
893 struct wiphy *request_wiphy = NULL;
895 assert_cfg80211_lock();
897 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
899 sband = wiphy->bands[band];
900 BUG_ON(chan_idx >= sband->n_channels);
901 chan = &sband->channels[chan_idx];
903 flags = chan->orig_flags;
905 r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq),
906 &max_bandwidth, ®_rule);
910 * This means no regulatory rule was found in the country IE
911 * with a frequency range on the center_freq's band, since
912 * IEEE-802.11 allows for a country IE to have a subset of the
913 * regulatory information provided in a country we ignore
914 * disabling the channel unless at least one reg rule was
915 * found on the center_freq's band. For details see this
918 * http://tinyurl.com/11d-clarification
921 last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
922 #ifdef CONFIG_CFG80211_REG_DEBUG
923 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
924 "intact on %s - no rule found in band on "
926 chan->center_freq, wiphy_name(wiphy));
930 * In this case we know the country IE has at least one reg rule
931 * for the band so we respect its band definitions
933 #ifdef CONFIG_CFG80211_REG_DEBUG
934 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
935 printk(KERN_DEBUG "cfg80211: Disabling "
936 "channel %d MHz on %s due to "
938 chan->center_freq, wiphy_name(wiphy));
940 flags |= IEEE80211_CHAN_DISABLED;
946 power_rule = ®_rule->power_rule;
948 if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
949 request_wiphy && request_wiphy == wiphy &&
950 request_wiphy->strict_regulatory) {
952 * This gaurantees the driver's requested regulatory domain
953 * will always be used as a base for further regulatory
956 chan->flags = chan->orig_flags =
957 map_regdom_flags(reg_rule->flags);
958 chan->max_antenna_gain = chan->orig_mag =
959 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
960 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
961 chan->max_power = chan->orig_mpwr =
962 (int) MBM_TO_DBM(power_rule->max_eirp);
966 chan->flags = flags | map_regdom_flags(reg_rule->flags);
967 chan->max_antenna_gain = min(chan->orig_mag,
968 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
969 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
971 chan->max_power = min(chan->orig_mpwr,
972 (int) MBM_TO_DBM(power_rule->max_eirp));
974 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
977 static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
980 struct ieee80211_supported_band *sband;
982 BUG_ON(!wiphy->bands[band]);
983 sband = wiphy->bands[band];
985 for (i = 0; i < sband->n_channels; i++)
986 handle_channel(wiphy, band, i);
989 static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby)
993 if (setby == REGDOM_SET_BY_CORE &&
994 wiphy->custom_regulatory)
997 * wiphy->regd will be set once the device has its own
998 * desired regulatory domain set
1000 if (wiphy->strict_regulatory && !wiphy->regd &&
1001 !is_world_regdom(last_request->alpha2))
1006 static void update_all_wiphy_regulatory(enum reg_set_by setby)
1008 struct cfg80211_registered_device *drv;
1010 list_for_each_entry(drv, &cfg80211_drv_list, list)
1011 wiphy_update_regulatory(&drv->wiphy, setby);
1014 void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
1016 enum ieee80211_band band;
1018 if (ignore_reg_update(wiphy, setby))
1020 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1021 if (wiphy->bands[band])
1022 handle_band(wiphy, band);
1024 if (wiphy->reg_notifier)
1025 wiphy->reg_notifier(wiphy, last_request);
1028 static void handle_channel_custom(struct wiphy *wiphy,
1029 enum ieee80211_band band,
1030 unsigned int chan_idx,
1031 const struct ieee80211_regdomain *regd)
1034 u32 max_bandwidth = 0;
1035 const struct ieee80211_reg_rule *reg_rule = NULL;
1036 const struct ieee80211_power_rule *power_rule = NULL;
1037 struct ieee80211_supported_band *sband;
1038 struct ieee80211_channel *chan;
1040 sband = wiphy->bands[band];
1041 BUG_ON(chan_idx >= sband->n_channels);
1042 chan = &sband->channels[chan_idx];
1044 r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1045 &max_bandwidth, ®_rule, regd);
1048 chan->flags = IEEE80211_CHAN_DISABLED;
1052 power_rule = ®_rule->power_rule;
1054 chan->flags |= map_regdom_flags(reg_rule->flags);
1055 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1056 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
1057 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1060 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1061 const struct ieee80211_regdomain *regd)
1064 struct ieee80211_supported_band *sband;
1066 BUG_ON(!wiphy->bands[band]);
1067 sband = wiphy->bands[band];
1069 for (i = 0; i < sband->n_channels; i++)
1070 handle_channel_custom(wiphy, band, i, regd);
1073 /* Used by drivers prior to wiphy registration */
1074 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1075 const struct ieee80211_regdomain *regd)
1077 enum ieee80211_band band;
1078 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1079 if (wiphy->bands[band])
1080 handle_band_custom(wiphy, band, regd);
1083 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1085 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
1086 const struct ieee80211_regdomain *src_regd)
1088 struct ieee80211_regdomain *regd;
1089 int size_of_regd = 0;
1092 size_of_regd = sizeof(struct ieee80211_regdomain) +
1093 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
1095 regd = kzalloc(size_of_regd, GFP_KERNEL);
1099 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
1101 for (i = 0; i < src_regd->n_reg_rules; i++)
1102 memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
1103 sizeof(struct ieee80211_reg_rule));
1110 * Return value which can be used by ignore_request() to indicate
1111 * it has been determined we should intersect two regulatory domains
1113 #define REG_INTERSECT 1
1115 /* This has the logic which determines when a new request
1116 * should be ignored. */
1117 static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
1120 struct wiphy *last_wiphy = NULL;
1122 assert_cfg80211_lock();
1124 /* All initial requests are respected */
1129 case REGDOM_SET_BY_INIT:
1131 case REGDOM_SET_BY_CORE:
1133 case REGDOM_SET_BY_COUNTRY_IE:
1135 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1137 if (unlikely(!is_an_alpha2(alpha2)))
1139 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
1140 if (last_wiphy != wiphy) {
1142 * Two cards with two APs claiming different
1143 * different Country IE alpha2s. We could
1144 * intersect them, but that seems unlikely
1145 * to be correct. Reject second one for now.
1147 if (regdom_changes(alpha2))
1152 * Two consecutive Country IE hints on the same wiphy.
1153 * This should be picked up early by the driver/stack
1155 if (WARN_ON(regdom_changes(alpha2)))
1159 return REG_INTERSECT;
1160 case REGDOM_SET_BY_DRIVER:
1161 if (last_request->initiator == REGDOM_SET_BY_CORE) {
1162 if (is_old_static_regdom(cfg80211_regdomain))
1164 if (regdom_changes(alpha2))
1170 * This would happen if you unplug and plug your card
1171 * back in or if you add a new device for which the previously
1172 * loaded card also agrees on the regulatory domain.
1174 if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
1175 !regdom_changes(alpha2))
1178 return REG_INTERSECT;
1179 case REGDOM_SET_BY_USER:
1180 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
1181 return REG_INTERSECT;
1183 * If the user knows better the user should set the regdom
1184 * to their country before the IE is picked up
1186 if (last_request->initiator == REGDOM_SET_BY_USER &&
1187 last_request->intersect)
1190 * Process user requests only after previous user/driver/core
1191 * requests have been processed
1193 if (last_request->initiator == REGDOM_SET_BY_CORE ||
1194 last_request->initiator == REGDOM_SET_BY_DRIVER ||
1195 last_request->initiator == REGDOM_SET_BY_USER) {
1196 if (regdom_changes(last_request->alpha2))
1200 if (!is_old_static_regdom(cfg80211_regdomain) &&
1201 !regdom_changes(alpha2))
1210 /* Caller must hold &cfg80211_mutex */
1211 int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
1213 u32 country_ie_checksum,
1214 enum environment_cap env)
1216 struct regulatory_request *request;
1217 bool intersect = false;
1220 assert_cfg80211_lock();
1222 r = ignore_request(wiphy, set_by, alpha2);
1224 if (r == REG_INTERSECT) {
1225 if (set_by == REGDOM_SET_BY_DRIVER) {
1226 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1233 * If the regulatory domain being requested by the
1234 * driver has already been set just copy it to the
1237 if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) {
1238 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1248 request = kzalloc(sizeof(struct regulatory_request),
1253 request->alpha2[0] = alpha2[0];
1254 request->alpha2[1] = alpha2[1];
1255 request->initiator = set_by;
1256 request->wiphy_idx = get_wiphy_idx(wiphy);
1257 request->intersect = intersect;
1258 request->country_ie_checksum = country_ie_checksum;
1259 request->country_ie_env = env;
1261 kfree(last_request);
1262 last_request = request;
1264 /* When r == REG_INTERSECT we do need to call CRDA */
1269 * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
1270 * AND if CRDA is NOT present nothing will happen, if someone
1271 * wants to bother with 11d with OLD_REG you can add a timer.
1272 * If after x amount of time nothing happens you can call:
1274 * return set_regdom(country_ie_regdomain);
1276 * to intersect with the static rd
1278 return call_crda(alpha2);
1281 /* This currently only processes user and driver regulatory hints */
1282 static int reg_process_hint(struct regulatory_request *reg_request)
1285 struct wiphy *wiphy = NULL;
1287 BUG_ON(!reg_request->alpha2);
1289 mutex_lock(&cfg80211_mutex);
1291 if (wiphy_idx_valid(reg_request->wiphy_idx))
1292 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1294 if (reg_request->initiator == REGDOM_SET_BY_DRIVER &&
1300 r = __regulatory_hint(wiphy,
1301 reg_request->initiator,
1302 reg_request->alpha2,
1303 reg_request->country_ie_checksum,
1304 reg_request->country_ie_env);
1305 /* This is required so that the orig_* parameters are saved */
1306 if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
1307 wiphy_update_regulatory(wiphy, reg_request->initiator);
1309 mutex_unlock(&cfg80211_mutex);
1317 static void reg_process_pending_hints(void)
1319 struct regulatory_request *reg_request;
1322 spin_lock(®_requests_lock);
1323 while (!list_empty(®_requests_list)) {
1324 reg_request = list_first_entry(®_requests_list,
1325 struct regulatory_request,
1327 list_del_init(®_request->list);
1328 spin_unlock(®_requests_lock);
1330 r = reg_process_hint(reg_request);
1331 #ifdef CONFIG_CFG80211_REG_DEBUG
1332 if (r && (reg_request->initiator == REGDOM_SET_BY_DRIVER ||
1333 reg_request->initiator == REGDOM_SET_BY_COUNTRY_IE))
1334 printk(KERN_ERR "cfg80211: wiphy_idx %d sent a "
1335 "regulatory hint for %c%c but now has "
1336 "gone fishing, ignoring request\n",
1337 reg_request->wiphy_idx,
1338 reg_request->alpha2[0],
1339 reg_request->alpha2[1]);
1342 spin_lock(®_requests_lock);
1344 spin_unlock(®_requests_lock);
1347 static void reg_todo(struct work_struct *work)
1349 reg_process_pending_hints();
1352 static DECLARE_WORK(reg_work, reg_todo);
1354 static void queue_regulatory_request(struct regulatory_request *request)
1356 spin_lock(®_requests_lock);
1357 list_add_tail(&request->list, ®_requests_list);
1358 spin_unlock(®_requests_lock);
1360 schedule_work(®_work);
1363 /* Core regulatory hint -- happens once during cfg80211_init() */
1364 static int regulatory_hint_core(const char *alpha2)
1366 struct regulatory_request *request;
1368 BUG_ON(last_request);
1370 request = kzalloc(sizeof(struct regulatory_request),
1375 request->alpha2[0] = alpha2[0];
1376 request->alpha2[1] = alpha2[1];
1377 request->initiator = REGDOM_SET_BY_CORE;
1379 queue_regulatory_request(request);
1385 int regulatory_hint_user(const char *alpha2)
1387 struct regulatory_request *request;
1391 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1395 request->wiphy_idx = WIPHY_IDX_STALE;
1396 request->alpha2[0] = alpha2[0];
1397 request->alpha2[1] = alpha2[1];
1398 request->initiator = REGDOM_SET_BY_USER,
1400 queue_regulatory_request(request);
1406 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1408 struct regulatory_request *request;
1413 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1417 request->wiphy_idx = get_wiphy_idx(wiphy);
1419 /* Must have registered wiphy first */
1420 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1422 request->alpha2[0] = alpha2[0];
1423 request->alpha2[1] = alpha2[1];
1424 request->initiator = REGDOM_SET_BY_DRIVER;
1426 queue_regulatory_request(request);
1430 EXPORT_SYMBOL(regulatory_hint);
1432 static bool reg_same_country_ie_hint(struct wiphy *wiphy,
1433 u32 country_ie_checksum)
1435 struct wiphy *request_wiphy;
1437 assert_cfg80211_lock();
1439 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1444 if (likely(request_wiphy != wiphy))
1445 return !country_ie_integrity_changes(country_ie_checksum);
1447 * We should not have let these through at this point, they
1448 * should have been picked up earlier by the first alpha2 check
1451 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
1456 void regulatory_hint_11d(struct wiphy *wiphy,
1460 struct ieee80211_regdomain *rd = NULL;
1463 enum environment_cap env = ENVIRON_ANY;
1464 struct regulatory_request *request;
1466 mutex_lock(&cfg80211_mutex);
1468 if (unlikely(!last_request)) {
1469 mutex_unlock(&cfg80211_mutex);
1473 /* IE len must be evenly divisible by 2 */
1474 if (country_ie_len & 0x01)
1477 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1481 * Pending country IE processing, this can happen after we
1482 * call CRDA and wait for a response if a beacon was received before
1483 * we were able to process the last regulatory_hint_11d() call
1485 if (country_ie_regdomain)
1488 alpha2[0] = country_ie[0];
1489 alpha2[1] = country_ie[1];
1491 if (country_ie[2] == 'I')
1492 env = ENVIRON_INDOOR;
1493 else if (country_ie[2] == 'O')
1494 env = ENVIRON_OUTDOOR;
1497 * We will run this for *every* beacon processed for the BSSID, so
1498 * we optimize an early check to exit out early if we don't have to
1501 if (likely(wiphy_idx_valid(last_request->wiphy_idx))) {
1502 struct cfg80211_registered_device *drv_last_ie;
1505 cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx);
1508 * Lets keep this simple -- we trust the first AP
1509 * after we intersect with CRDA
1511 if (likely(&drv_last_ie->wiphy == wiphy)) {
1513 * Ignore IEs coming in on this wiphy with
1514 * the same alpha2 and environment cap
1516 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1518 env == drv_last_ie->env)) {
1522 * the wiphy moved on to another BSSID or the AP
1523 * was reconfigured. XXX: We need to deal with the
1524 * case where the user suspends and goes to goes
1525 * to another country, and then gets IEs from an
1526 * AP with different settings
1531 * Ignore IEs coming in on two separate wiphys with
1532 * the same alpha2 and environment cap
1534 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1536 env == drv_last_ie->env)) {
1539 /* We could potentially intersect though */
1544 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
1549 * This will not happen right now but we leave it here for the
1550 * the future when we want to add suspend/resume support and having
1551 * the user move to another country after doing so, or having the user
1552 * move to another AP. Right now we just trust the first AP.
1554 * If we hit this before we add this support we want to be informed of
1555 * it as it would indicate a mistake in the current design
1557 if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))
1560 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1565 * We keep this around for when CRDA comes back with a response so
1566 * we can intersect with that
1568 country_ie_regdomain = rd;
1570 request->wiphy_idx = get_wiphy_idx(wiphy);
1571 request->alpha2[0] = rd->alpha2[0];
1572 request->alpha2[1] = rd->alpha2[1];
1573 request->initiator = REGDOM_SET_BY_COUNTRY_IE;
1574 request->country_ie_checksum = checksum;
1575 request->country_ie_env = env;
1577 mutex_unlock(&cfg80211_mutex);
1579 queue_regulatory_request(request);
1586 mutex_unlock(&cfg80211_mutex);
1588 EXPORT_SYMBOL(regulatory_hint_11d);
1590 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1593 const struct ieee80211_reg_rule *reg_rule = NULL;
1594 const struct ieee80211_freq_range *freq_range = NULL;
1595 const struct ieee80211_power_rule *power_rule = NULL;
1597 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
1598 "(max_antenna_gain, max_eirp)\n");
1600 for (i = 0; i < rd->n_reg_rules; i++) {
1601 reg_rule = &rd->reg_rules[i];
1602 freq_range = ®_rule->freq_range;
1603 power_rule = ®_rule->power_rule;
1606 * There may not be documentation for max antenna gain
1607 * in certain regions
1609 if (power_rule->max_antenna_gain)
1610 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1611 "(%d mBi, %d mBm)\n",
1612 freq_range->start_freq_khz,
1613 freq_range->end_freq_khz,
1614 freq_range->max_bandwidth_khz,
1615 power_rule->max_antenna_gain,
1616 power_rule->max_eirp);
1618 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1620 freq_range->start_freq_khz,
1621 freq_range->end_freq_khz,
1622 freq_range->max_bandwidth_khz,
1623 power_rule->max_eirp);
1627 static void print_regdomain(const struct ieee80211_regdomain *rd)
1630 if (is_intersected_alpha2(rd->alpha2)) {
1632 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
1633 struct cfg80211_registered_device *drv;
1634 drv = cfg80211_drv_by_wiphy_idx(
1635 last_request->wiphy_idx);
1637 printk(KERN_INFO "cfg80211: Current regulatory "
1638 "domain updated by AP to: %c%c\n",
1639 drv->country_ie_alpha2[0],
1640 drv->country_ie_alpha2[1]);
1642 printk(KERN_INFO "cfg80211: Current regulatory "
1643 "domain intersected: \n");
1645 printk(KERN_INFO "cfg80211: Current regulatory "
1646 "domain intersected: \n");
1647 } else if (is_world_regdom(rd->alpha2))
1648 printk(KERN_INFO "cfg80211: World regulatory "
1649 "domain updated:\n");
1651 if (is_unknown_alpha2(rd->alpha2))
1652 printk(KERN_INFO "cfg80211: Regulatory domain "
1653 "changed to driver built-in settings "
1654 "(unknown country)\n");
1656 printk(KERN_INFO "cfg80211: Regulatory domain "
1657 "changed to country: %c%c\n",
1658 rd->alpha2[0], rd->alpha2[1]);
1663 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1665 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1666 rd->alpha2[0], rd->alpha2[1]);
1670 #ifdef CONFIG_CFG80211_REG_DEBUG
1671 static void reg_country_ie_process_debug(
1672 const struct ieee80211_regdomain *rd,
1673 const struct ieee80211_regdomain *country_ie_regdomain,
1674 const struct ieee80211_regdomain *intersected_rd)
1676 printk(KERN_DEBUG "cfg80211: Received country IE:\n");
1677 print_regdomain_info(country_ie_regdomain);
1678 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
1679 print_regdomain_info(rd);
1680 if (intersected_rd) {
1681 printk(KERN_DEBUG "cfg80211: We intersect both of these "
1683 print_regdomain_info(intersected_rd);
1686 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
1689 static inline void reg_country_ie_process_debug(
1690 const struct ieee80211_regdomain *rd,
1691 const struct ieee80211_regdomain *country_ie_regdomain,
1692 const struct ieee80211_regdomain *intersected_rd)
1697 /* Takes ownership of rd only if it doesn't fail */
1698 static int __set_regdom(const struct ieee80211_regdomain *rd)
1700 const struct ieee80211_regdomain *intersected_rd = NULL;
1701 struct cfg80211_registered_device *drv = NULL;
1702 struct wiphy *request_wiphy;
1703 /* Some basic sanity checks first */
1705 if (is_world_regdom(rd->alpha2)) {
1706 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1708 update_world_regdomain(rd);
1712 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1713 !is_unknown_alpha2(rd->alpha2))
1720 * Lets only bother proceeding on the same alpha2 if the current
1721 * rd is non static (it means CRDA was present and was used last)
1722 * and the pending request came in from a country IE
1724 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1726 * If someone else asked us to change the rd lets only bother
1727 * checking if the alpha2 changes if CRDA was already called
1729 if (!is_old_static_regdom(cfg80211_regdomain) &&
1730 !regdom_changes(rd->alpha2))
1735 * Now lets set the regulatory domain, update all driver channels
1736 * and finally inform them of what we have done, in case they want
1737 * to review or adjust their own settings based on their own
1738 * internal EEPROM data
1741 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1744 if (!is_valid_rd(rd)) {
1745 printk(KERN_ERR "cfg80211: Invalid "
1746 "regulatory domain detected:\n");
1747 print_regdomain_info(rd);
1751 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1753 if (!last_request->intersect) {
1756 if (last_request->initiator != REGDOM_SET_BY_DRIVER) {
1758 cfg80211_regdomain = rd;
1763 * For a driver hint, lets copy the regulatory domain the
1764 * driver wanted to the wiphy to deal with conflicts
1767 BUG_ON(request_wiphy->regd);
1769 r = reg_copy_regd(&request_wiphy->regd, rd);
1774 cfg80211_regdomain = rd;
1778 /* Intersection requires a bit more work */
1780 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1782 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1783 if (!intersected_rd)
1787 * We can trash what CRDA provided now.
1788 * However if a driver requested this specific regulatory
1789 * domain we keep it for its private use
1791 if (last_request->initiator == REGDOM_SET_BY_DRIVER)
1792 request_wiphy->regd = rd;
1799 cfg80211_regdomain = intersected_rd;
1805 * Country IE requests are handled a bit differently, we intersect
1806 * the country IE rd with what CRDA believes that country should have
1809 BUG_ON(!country_ie_regdomain);
1811 if (rd != country_ie_regdomain) {
1813 * Intersect what CRDA returned and our what we
1814 * had built from the Country IE received
1817 intersected_rd = regdom_intersect(rd, country_ie_regdomain);
1819 reg_country_ie_process_debug(rd, country_ie_regdomain,
1822 kfree(country_ie_regdomain);
1823 country_ie_regdomain = NULL;
1826 * This would happen when CRDA was not present and
1827 * OLD_REGULATORY was enabled. We intersect our Country
1828 * IE rd and what was set on cfg80211 originally
1830 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1833 if (!intersected_rd)
1836 drv = wiphy_to_dev(request_wiphy);
1838 drv->country_ie_alpha2[0] = rd->alpha2[0];
1839 drv->country_ie_alpha2[1] = rd->alpha2[1];
1840 drv->env = last_request->country_ie_env;
1842 BUG_ON(intersected_rd == rd);
1848 cfg80211_regdomain = intersected_rd;
1855 * Use this call to set the current regulatory domain. Conflicts with
1856 * multiple drivers can be ironed out later. Caller must've already
1857 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
1859 int set_regdom(const struct ieee80211_regdomain *rd)
1863 assert_cfg80211_lock();
1865 /* Note that this doesn't update the wiphys, this is done below */
1866 r = __set_regdom(rd);
1872 /* This would make this whole thing pointless */
1873 if (!last_request->intersect)
1874 BUG_ON(rd != cfg80211_regdomain);
1876 /* update all wiphys now with the new established regulatory domain */
1877 update_all_wiphy_regulatory(last_request->initiator);
1879 print_regdomain(cfg80211_regdomain);
1884 /* Caller must hold cfg80211_mutex */
1885 void reg_device_remove(struct wiphy *wiphy)
1887 struct wiphy *request_wiphy;
1889 assert_cfg80211_lock();
1891 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1894 if (!last_request || !request_wiphy)
1896 if (request_wiphy != wiphy)
1898 last_request->wiphy_idx = WIPHY_IDX_STALE;
1899 last_request->country_ie_env = ENVIRON_ANY;
1902 int regulatory_init(void)
1906 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
1907 if (IS_ERR(reg_pdev))
1908 return PTR_ERR(reg_pdev);
1910 spin_lock_init(®_requests_lock);
1912 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
1913 cfg80211_regdomain = static_regdom(ieee80211_regdom);
1915 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
1916 print_regdomain_info(cfg80211_regdomain);
1918 * The old code still requests for a new regdomain and if
1919 * you have CRDA you get it updated, otherwise you get
1920 * stuck with the static values. We ignore "EU" code as
1921 * that is not a valid ISO / IEC 3166 alpha2
1923 if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
1924 err = regulatory_hint_core(ieee80211_regdom);
1926 cfg80211_regdomain = cfg80211_world_regdom;
1928 err = regulatory_hint_core("00");
1934 * N.B. kobject_uevent_env() can fail mainly for when we're out
1935 * memory which is handled and propagated appropriately above
1936 * but it can also fail during a netlink_broadcast() or during
1937 * early boot for call_usermodehelper(). For now treat these
1938 * errors as non-fatal.
1940 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
1941 "to call CRDA during init");
1942 #ifdef CONFIG_CFG80211_REG_DEBUG
1943 /* We want to find out exactly why when debugging */
1951 void regulatory_exit(void)
1953 struct regulatory_request *reg_request, *tmp;
1955 cancel_work_sync(®_work);
1957 mutex_lock(&cfg80211_mutex);
1961 kfree(country_ie_regdomain);
1962 country_ie_regdomain = NULL;
1964 kfree(last_request);
1966 platform_device_unregister(reg_pdev);
1968 spin_lock(®_requests_lock);
1969 if (!list_empty(®_requests_list)) {
1970 list_for_each_entry_safe(reg_request, tmp,
1971 ®_requests_list, list) {
1972 list_del(®_request->list);
1976 spin_unlock(®_requests_lock);
1978 mutex_unlock(&cfg80211_mutex);