init from v2.6.32.60
[mach-moxart.git] / net / wireless / reg.c
blob428c5bb5c802d37b2b7e7d667102a1c8ec9e472e
1 /*
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.
12 /**
13 * DOC: Wireless regulatory infrastructure
15 * The usual implementation is for a driver to read a device EEPROM to
16 * determine which regulatory domain it should be operating under, then
17 * looking up the allowable channels in a driver-local table and finally
18 * registering those channels in the wiphy structure.
20 * Another set of compliance enforcement is for drivers to use their
21 * own compliance limits which can be stored on the EEPROM. The host
22 * driver or firmware may ensure these are used.
24 * In addition to all this we provide an extra layer of regulatory
25 * conformance. For drivers which do not have any regulatory
26 * information CRDA provides the complete regulatory solution.
27 * For others it provides a community effort on further restrictions
28 * to enhance compliance.
30 * Note: When number of rules --> infinity we will not be able to
31 * index on alpha2 any more, instead we'll probably have to
32 * rely on some SHA1 checksum of the regdomain for example.
35 #include <linux/kernel.h>
36 #include <linux/list.h>
37 #include <linux/random.h>
38 #include <linux/nl80211.h>
39 #include <linux/platform_device.h>
40 #include <net/cfg80211.h>
41 #include "core.h"
42 #include "reg.h"
43 #include "nl80211.h"
45 /* Receipt of information from last regulatory request */
46 static struct regulatory_request *last_request;
48 /* To trigger userspace events */
49 static struct platform_device *reg_pdev;
52 * Central wireless core regulatory domains, we only need two,
53 * the current one and a world regulatory domain in case we have no
54 * information to give us an alpha2
56 const struct ieee80211_regdomain *cfg80211_regdomain;
59 * We use this as a place for the rd structure built from the
60 * last parsed country IE to rest until CRDA gets back to us with
61 * what it thinks should apply for the same country
63 static const struct ieee80211_regdomain *country_ie_regdomain;
66 * Protects static reg.c components:
67 * - cfg80211_world_regdom
68 * - cfg80211_regdom
69 * - country_ie_regdomain
70 * - last_request
72 DEFINE_MUTEX(reg_mutex);
73 #define assert_reg_lock() WARN_ON(!mutex_is_locked(&reg_mutex))
75 /* Used to queue up regulatory hints */
76 static LIST_HEAD(reg_requests_list);
77 static spinlock_t reg_requests_lock;
79 /* Used to queue up beacon hints for review */
80 static LIST_HEAD(reg_pending_beacons);
81 static spinlock_t reg_pending_beacons_lock;
83 /* Used to keep track of processed beacon hints */
84 static LIST_HEAD(reg_beacon_list);
86 struct reg_beacon {
87 struct list_head list;
88 struct ieee80211_channel chan;
91 /* We keep a static world regulatory domain in case of the absence of CRDA */
92 static const struct ieee80211_regdomain world_regdom = {
93 .n_reg_rules = 5,
94 .alpha2 = "00",
95 .reg_rules = {
96 /* IEEE 802.11b/g, channels 1..11 */
97 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
98 /* IEEE 802.11b/g, channels 12..13. No HT40
99 * channel fits here. */
100 REG_RULE(2467-10, 2472+10, 20, 6, 20,
101 NL80211_RRF_PASSIVE_SCAN |
102 NL80211_RRF_NO_IBSS),
103 /* IEEE 802.11 channel 14 - Only JP enables
104 * this and for 802.11b only */
105 REG_RULE(2484-10, 2484+10, 20, 6, 20,
106 NL80211_RRF_PASSIVE_SCAN |
107 NL80211_RRF_NO_IBSS |
108 NL80211_RRF_NO_OFDM),
109 /* IEEE 802.11a, channel 36..48 */
110 REG_RULE(5180-10, 5240+10, 40, 6, 20,
111 NL80211_RRF_PASSIVE_SCAN |
112 NL80211_RRF_NO_IBSS),
114 /* NB: 5260 MHz - 5700 MHz requies DFS */
116 /* IEEE 802.11a, channel 149..165 */
117 REG_RULE(5745-10, 5825+10, 40, 6, 20,
118 NL80211_RRF_PASSIVE_SCAN |
119 NL80211_RRF_NO_IBSS),
123 static const struct ieee80211_regdomain *cfg80211_world_regdom =
124 &world_regdom;
126 static char *ieee80211_regdom = "00";
128 module_param(ieee80211_regdom, charp, 0444);
129 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
131 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
133 * We assume 40 MHz bandwidth for the old regulatory work.
134 * We make emphasis we are using the exact same frequencies
135 * as before
138 static const struct ieee80211_regdomain us_regdom = {
139 .n_reg_rules = 6,
140 .alpha2 = "US",
141 .reg_rules = {
142 /* IEEE 802.11b/g, channels 1..11 */
143 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
144 /* IEEE 802.11a, channel 36 */
145 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
146 /* IEEE 802.11a, channel 40 */
147 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
148 /* IEEE 802.11a, channel 44 */
149 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
150 /* IEEE 802.11a, channels 48..64 */
151 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
152 /* IEEE 802.11a, channels 149..165, outdoor */
153 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
157 static const struct ieee80211_regdomain jp_regdom = {
158 .n_reg_rules = 3,
159 .alpha2 = "JP",
160 .reg_rules = {
161 /* IEEE 802.11b/g, channels 1..14 */
162 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
163 /* IEEE 802.11a, channels 34..48 */
164 REG_RULE(5170-10, 5240+10, 40, 6, 20,
165 NL80211_RRF_PASSIVE_SCAN),
166 /* IEEE 802.11a, channels 52..64 */
167 REG_RULE(5260-10, 5320+10, 40, 6, 20,
168 NL80211_RRF_NO_IBSS |
169 NL80211_RRF_DFS),
173 static const struct ieee80211_regdomain eu_regdom = {
174 .n_reg_rules = 6,
176 * This alpha2 is bogus, we leave it here just for stupid
177 * backward compatibility
179 .alpha2 = "EU",
180 .reg_rules = {
181 /* IEEE 802.11b/g, channels 1..13 */
182 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
183 /* IEEE 802.11a, channel 36 */
184 REG_RULE(5180-10, 5180+10, 40, 6, 23,
185 NL80211_RRF_PASSIVE_SCAN),
186 /* IEEE 802.11a, channel 40 */
187 REG_RULE(5200-10, 5200+10, 40, 6, 23,
188 NL80211_RRF_PASSIVE_SCAN),
189 /* IEEE 802.11a, channel 44 */
190 REG_RULE(5220-10, 5220+10, 40, 6, 23,
191 NL80211_RRF_PASSIVE_SCAN),
192 /* IEEE 802.11a, channels 48..64 */
193 REG_RULE(5240-10, 5320+10, 40, 6, 20,
194 NL80211_RRF_NO_IBSS |
195 NL80211_RRF_DFS),
196 /* IEEE 802.11a, channels 100..140 */
197 REG_RULE(5500-10, 5700+10, 40, 6, 30,
198 NL80211_RRF_NO_IBSS |
199 NL80211_RRF_DFS),
203 static const struct ieee80211_regdomain *static_regdom(char *alpha2)
205 if (alpha2[0] == 'U' && alpha2[1] == 'S')
206 return &us_regdom;
207 if (alpha2[0] == 'J' && alpha2[1] == 'P')
208 return &jp_regdom;
209 if (alpha2[0] == 'E' && alpha2[1] == 'U')
210 return &eu_regdom;
211 /* Default, as per the old rules */
212 return &us_regdom;
215 static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
217 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
218 return true;
219 return false;
221 #else
222 static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
224 return false;
226 #endif
228 static void reset_regdomains(void)
230 /* avoid freeing static information or freeing something twice */
231 if (cfg80211_regdomain == cfg80211_world_regdom)
232 cfg80211_regdomain = NULL;
233 if (cfg80211_world_regdom == &world_regdom)
234 cfg80211_world_regdom = NULL;
235 if (cfg80211_regdomain == &world_regdom)
236 cfg80211_regdomain = NULL;
237 if (is_old_static_regdom(cfg80211_regdomain))
238 cfg80211_regdomain = NULL;
240 kfree(cfg80211_regdomain);
241 kfree(cfg80211_world_regdom);
243 cfg80211_world_regdom = &world_regdom;
244 cfg80211_regdomain = NULL;
248 * Dynamic world regulatory domain requested by the wireless
249 * core upon initialization
251 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
253 BUG_ON(!last_request);
255 reset_regdomains();
257 cfg80211_world_regdom = rd;
258 cfg80211_regdomain = rd;
261 bool is_world_regdom(const char *alpha2)
263 if (!alpha2)
264 return false;
265 if (alpha2[0] == '0' && alpha2[1] == '0')
266 return true;
267 return false;
270 static bool is_alpha2_set(const char *alpha2)
272 if (!alpha2)
273 return false;
274 if (alpha2[0] != 0 && alpha2[1] != 0)
275 return true;
276 return false;
279 static bool is_alpha_upper(char letter)
281 /* ASCII A - Z */
282 if (letter >= 65 && letter <= 90)
283 return true;
284 return false;
287 static bool is_unknown_alpha2(const char *alpha2)
289 if (!alpha2)
290 return false;
292 * Special case where regulatory domain was built by driver
293 * but a specific alpha2 cannot be determined
295 if (alpha2[0] == '9' && alpha2[1] == '9')
296 return true;
297 return false;
300 static bool is_intersected_alpha2(const char *alpha2)
302 if (!alpha2)
303 return false;
305 * Special case where regulatory domain is the
306 * result of an intersection between two regulatory domain
307 * structures
309 if (alpha2[0] == '9' && alpha2[1] == '8')
310 return true;
311 return false;
314 static bool is_an_alpha2(const char *alpha2)
316 if (!alpha2)
317 return false;
318 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
319 return true;
320 return false;
323 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
325 if (!alpha2_x || !alpha2_y)
326 return false;
327 if (alpha2_x[0] == alpha2_y[0] &&
328 alpha2_x[1] == alpha2_y[1])
329 return true;
330 return false;
333 static bool regdom_changes(const char *alpha2)
335 assert_cfg80211_lock();
337 if (!cfg80211_regdomain)
338 return true;
339 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
340 return false;
341 return true;
345 * country_ie_integrity_changes - tells us if the country IE has changed
346 * @checksum: checksum of country IE of fields we are interested in
348 * If the country IE has not changed you can ignore it safely. This is
349 * useful to determine if two devices are seeing two different country IEs
350 * even on the same alpha2. Note that this will return false if no IE has
351 * been set on the wireless core yet.
353 static bool country_ie_integrity_changes(u32 checksum)
355 /* If no IE has been set then the checksum doesn't change */
356 if (unlikely(!last_request->country_ie_checksum))
357 return false;
358 if (unlikely(last_request->country_ie_checksum != checksum))
359 return true;
360 return false;
364 * This lets us keep regulatory code which is updated on a regulatory
365 * basis in userspace.
367 static int call_crda(const char *alpha2)
369 char country_env[9 + 2] = "COUNTRY=";
370 char *envp[] = {
371 country_env,
372 NULL
375 if (!is_world_regdom((char *) alpha2))
376 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
377 alpha2[0], alpha2[1]);
378 else
379 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
380 "regulatory domain\n");
382 country_env[8] = alpha2[0];
383 country_env[9] = alpha2[1];
385 return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
388 /* Used by nl80211 before kmalloc'ing our regulatory domain */
389 bool reg_is_valid_request(const char *alpha2)
391 assert_cfg80211_lock();
393 if (!last_request)
394 return false;
396 return alpha2_equal(last_request->alpha2, alpha2);
399 /* Sanity check on a regulatory rule */
400 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
402 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
403 u32 freq_diff;
405 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
406 return false;
408 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
409 return false;
411 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
413 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
414 freq_range->max_bandwidth_khz > freq_diff)
415 return false;
417 return true;
420 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
422 const struct ieee80211_reg_rule *reg_rule = NULL;
423 unsigned int i;
425 if (!rd->n_reg_rules)
426 return false;
428 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
429 return false;
431 for (i = 0; i < rd->n_reg_rules; i++) {
432 reg_rule = &rd->reg_rules[i];
433 if (!is_valid_reg_rule(reg_rule))
434 return false;
437 return true;
440 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
441 u32 center_freq_khz,
442 u32 bw_khz)
444 u32 start_freq_khz, end_freq_khz;
446 start_freq_khz = center_freq_khz - (bw_khz/2);
447 end_freq_khz = center_freq_khz + (bw_khz/2);
449 if (start_freq_khz >= freq_range->start_freq_khz &&
450 end_freq_khz <= freq_range->end_freq_khz)
451 return true;
453 return false;
457 * freq_in_rule_band - tells us if a frequency is in a frequency band
458 * @freq_range: frequency rule we want to query
459 * @freq_khz: frequency we are inquiring about
461 * This lets us know if a specific frequency rule is or is not relevant to
462 * a specific frequency's band. Bands are device specific and artificial
463 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
464 * safe for now to assume that a frequency rule should not be part of a
465 * frequency's band if the start freq or end freq are off by more than 2 GHz.
466 * This resolution can be lowered and should be considered as we add
467 * regulatory rule support for other "bands".
469 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
470 u32 freq_khz)
472 #define ONE_GHZ_IN_KHZ 1000000
473 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
474 return true;
475 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
476 return true;
477 return false;
478 #undef ONE_GHZ_IN_KHZ
482 * Converts a country IE to a regulatory domain. A regulatory domain
483 * structure has a lot of information which the IE doesn't yet have,
484 * so for the other values we use upper max values as we will intersect
485 * with our userspace regulatory agent to get lower bounds.
487 static struct ieee80211_regdomain *country_ie_2_rd(
488 u8 *country_ie,
489 u8 country_ie_len,
490 u32 *checksum)
492 struct ieee80211_regdomain *rd = NULL;
493 unsigned int i = 0;
494 char alpha2[2];
495 u32 flags = 0;
496 u32 num_rules = 0, size_of_regd = 0;
497 u8 *triplets_start = NULL;
498 u8 len_at_triplet = 0;
499 /* the last channel we have registered in a subband (triplet) */
500 int last_sub_max_channel = 0;
502 *checksum = 0xDEADBEEF;
504 /* Country IE requirements */
505 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
506 country_ie_len & 0x01);
508 alpha2[0] = country_ie[0];
509 alpha2[1] = country_ie[1];
512 * Third octet can be:
513 * 'I' - Indoor
514 * 'O' - Outdoor
516 * anything else we assume is no restrictions
518 if (country_ie[2] == 'I')
519 flags = NL80211_RRF_NO_OUTDOOR;
520 else if (country_ie[2] == 'O')
521 flags = NL80211_RRF_NO_INDOOR;
523 country_ie += 3;
524 country_ie_len -= 3;
526 triplets_start = country_ie;
527 len_at_triplet = country_ie_len;
529 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
532 * We need to build a reg rule for each triplet, but first we must
533 * calculate the number of reg rules we will need. We will need one
534 * for each channel subband
536 while (country_ie_len >= 3) {
537 int end_channel = 0;
538 struct ieee80211_country_ie_triplet *triplet =
539 (struct ieee80211_country_ie_triplet *) country_ie;
540 int cur_sub_max_channel = 0, cur_channel = 0;
542 if (triplet->ext.reg_extension_id >=
543 IEEE80211_COUNTRY_EXTENSION_ID) {
544 country_ie += 3;
545 country_ie_len -= 3;
546 continue;
549 /* 2 GHz */
550 if (triplet->chans.first_channel <= 14)
551 end_channel = triplet->chans.first_channel +
552 triplet->chans.num_channels;
553 else
555 * 5 GHz -- For example in country IEs if the first
556 * channel given is 36 and the number of channels is 4
557 * then the individual channel numbers defined for the
558 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
559 * and not 36, 37, 38, 39.
561 * See: http://tinyurl.com/11d-clarification
563 end_channel = triplet->chans.first_channel +
564 (4 * (triplet->chans.num_channels - 1));
566 cur_channel = triplet->chans.first_channel;
567 cur_sub_max_channel = end_channel;
569 /* Basic sanity check */
570 if (cur_sub_max_channel < cur_channel)
571 return NULL;
574 * Do not allow overlapping channels. Also channels
575 * passed in each subband must be monotonically
576 * increasing
578 if (last_sub_max_channel) {
579 if (cur_channel <= last_sub_max_channel)
580 return NULL;
581 if (cur_sub_max_channel <= last_sub_max_channel)
582 return NULL;
586 * When dot11RegulatoryClassesRequired is supported
587 * we can throw ext triplets as part of this soup,
588 * for now we don't care when those change as we
589 * don't support them
591 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
592 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
593 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
595 last_sub_max_channel = cur_sub_max_channel;
597 country_ie += 3;
598 country_ie_len -= 3;
599 num_rules++;
602 * Note: this is not a IEEE requirement but
603 * simply a memory requirement
605 if (num_rules > NL80211_MAX_SUPP_REG_RULES)
606 return NULL;
609 country_ie = triplets_start;
610 country_ie_len = len_at_triplet;
612 size_of_regd = sizeof(struct ieee80211_regdomain) +
613 (num_rules * sizeof(struct ieee80211_reg_rule));
615 rd = kzalloc(size_of_regd, GFP_KERNEL);
616 if (!rd)
617 return NULL;
619 rd->n_reg_rules = num_rules;
620 rd->alpha2[0] = alpha2[0];
621 rd->alpha2[1] = alpha2[1];
623 /* This time around we fill in the rd */
624 while (country_ie_len >= 3) {
625 int end_channel = 0;
626 struct ieee80211_country_ie_triplet *triplet =
627 (struct ieee80211_country_ie_triplet *) country_ie;
628 struct ieee80211_reg_rule *reg_rule = NULL;
629 struct ieee80211_freq_range *freq_range = NULL;
630 struct ieee80211_power_rule *power_rule = NULL;
633 * Must parse if dot11RegulatoryClassesRequired is true,
634 * we don't support this yet
636 if (triplet->ext.reg_extension_id >=
637 IEEE80211_COUNTRY_EXTENSION_ID) {
638 country_ie += 3;
639 country_ie_len -= 3;
640 continue;
643 reg_rule = &rd->reg_rules[i];
644 freq_range = &reg_rule->freq_range;
645 power_rule = &reg_rule->power_rule;
647 reg_rule->flags = flags;
649 /* 2 GHz */
650 if (triplet->chans.first_channel <= 14)
651 end_channel = triplet->chans.first_channel +
652 triplet->chans.num_channels;
653 else
654 end_channel = triplet->chans.first_channel +
655 (4 * (triplet->chans.num_channels - 1));
658 * The +10 is since the regulatory domain expects
659 * the actual band edge, not the center of freq for
660 * its start and end freqs, assuming 20 MHz bandwidth on
661 * the channels passed
663 freq_range->start_freq_khz =
664 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
665 triplet->chans.first_channel) - 10);
666 freq_range->end_freq_khz =
667 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
668 end_channel) + 10);
671 * These are large arbitrary values we use to intersect later.
672 * Increment this if we ever support >= 40 MHz channels
673 * in IEEE 802.11
675 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
676 power_rule->max_antenna_gain = DBI_TO_MBI(100);
677 power_rule->max_eirp = DBM_TO_MBM(100);
679 country_ie += 3;
680 country_ie_len -= 3;
681 i++;
683 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
686 return rd;
691 * Helper for regdom_intersect(), this does the real
692 * mathematical intersection fun
694 static int reg_rules_intersect(
695 const struct ieee80211_reg_rule *rule1,
696 const struct ieee80211_reg_rule *rule2,
697 struct ieee80211_reg_rule *intersected_rule)
699 const struct ieee80211_freq_range *freq_range1, *freq_range2;
700 struct ieee80211_freq_range *freq_range;
701 const struct ieee80211_power_rule *power_rule1, *power_rule2;
702 struct ieee80211_power_rule *power_rule;
703 u32 freq_diff;
705 freq_range1 = &rule1->freq_range;
706 freq_range2 = &rule2->freq_range;
707 freq_range = &intersected_rule->freq_range;
709 power_rule1 = &rule1->power_rule;
710 power_rule2 = &rule2->power_rule;
711 power_rule = &intersected_rule->power_rule;
713 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
714 freq_range2->start_freq_khz);
715 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
716 freq_range2->end_freq_khz);
717 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
718 freq_range2->max_bandwidth_khz);
720 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
721 if (freq_range->max_bandwidth_khz > freq_diff)
722 freq_range->max_bandwidth_khz = freq_diff;
724 power_rule->max_eirp = min(power_rule1->max_eirp,
725 power_rule2->max_eirp);
726 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
727 power_rule2->max_antenna_gain);
729 intersected_rule->flags = (rule1->flags | rule2->flags);
731 if (!is_valid_reg_rule(intersected_rule))
732 return -EINVAL;
734 return 0;
738 * regdom_intersect - do the intersection between two regulatory domains
739 * @rd1: first regulatory domain
740 * @rd2: second regulatory domain
742 * Use this function to get the intersection between two regulatory domains.
743 * Once completed we will mark the alpha2 for the rd as intersected, "98",
744 * as no one single alpha2 can represent this regulatory domain.
746 * Returns a pointer to the regulatory domain structure which will hold the
747 * resulting intersection of rules between rd1 and rd2. We will
748 * kzalloc() this structure for you.
750 static struct ieee80211_regdomain *regdom_intersect(
751 const struct ieee80211_regdomain *rd1,
752 const struct ieee80211_regdomain *rd2)
754 int r, size_of_regd;
755 unsigned int x, y;
756 unsigned int num_rules = 0, rule_idx = 0;
757 const struct ieee80211_reg_rule *rule1, *rule2;
758 struct ieee80211_reg_rule *intersected_rule;
759 struct ieee80211_regdomain *rd;
760 /* This is just a dummy holder to help us count */
761 struct ieee80211_reg_rule irule;
763 /* Uses the stack temporarily for counter arithmetic */
764 intersected_rule = &irule;
766 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
768 if (!rd1 || !rd2)
769 return NULL;
772 * First we get a count of the rules we'll need, then we actually
773 * build them. This is to so we can malloc() and free() a
774 * regdomain once. The reason we use reg_rules_intersect() here
775 * is it will return -EINVAL if the rule computed makes no sense.
776 * All rules that do check out OK are valid.
779 for (x = 0; x < rd1->n_reg_rules; x++) {
780 rule1 = &rd1->reg_rules[x];
781 for (y = 0; y < rd2->n_reg_rules; y++) {
782 rule2 = &rd2->reg_rules[y];
783 if (!reg_rules_intersect(rule1, rule2,
784 intersected_rule))
785 num_rules++;
786 memset(intersected_rule, 0,
787 sizeof(struct ieee80211_reg_rule));
791 if (!num_rules)
792 return NULL;
794 size_of_regd = sizeof(struct ieee80211_regdomain) +
795 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
797 rd = kzalloc(size_of_regd, GFP_KERNEL);
798 if (!rd)
799 return NULL;
801 for (x = 0; x < rd1->n_reg_rules; x++) {
802 rule1 = &rd1->reg_rules[x];
803 for (y = 0; y < rd2->n_reg_rules; y++) {
804 rule2 = &rd2->reg_rules[y];
806 * This time around instead of using the stack lets
807 * write to the target rule directly saving ourselves
808 * a memcpy()
810 intersected_rule = &rd->reg_rules[rule_idx];
811 r = reg_rules_intersect(rule1, rule2,
812 intersected_rule);
814 * No need to memset here the intersected rule here as
815 * we're not using the stack anymore
817 if (r)
818 continue;
819 rule_idx++;
823 if (rule_idx != num_rules) {
824 kfree(rd);
825 return NULL;
828 rd->n_reg_rules = num_rules;
829 rd->alpha2[0] = '9';
830 rd->alpha2[1] = '8';
832 return rd;
836 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
837 * want to just have the channel structure use these
839 static u32 map_regdom_flags(u32 rd_flags)
841 u32 channel_flags = 0;
842 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
843 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
844 if (rd_flags & NL80211_RRF_NO_IBSS)
845 channel_flags |= IEEE80211_CHAN_NO_IBSS;
846 if (rd_flags & NL80211_RRF_DFS)
847 channel_flags |= IEEE80211_CHAN_RADAR;
848 return channel_flags;
851 static int freq_reg_info_regd(struct wiphy *wiphy,
852 u32 center_freq,
853 u32 desired_bw_khz,
854 const struct ieee80211_reg_rule **reg_rule,
855 const struct ieee80211_regdomain *custom_regd)
857 int i;
858 bool band_rule_found = false;
859 const struct ieee80211_regdomain *regd;
860 bool bw_fits = false;
862 if (!desired_bw_khz)
863 desired_bw_khz = MHZ_TO_KHZ(20);
865 regd = custom_regd ? custom_regd : cfg80211_regdomain;
868 * Follow the driver's regulatory domain, if present, unless a country
869 * IE has been processed or a user wants to help complaince further
871 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
872 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
873 wiphy->regd)
874 regd = wiphy->regd;
876 if (!regd)
877 return -EINVAL;
879 for (i = 0; i < regd->n_reg_rules; i++) {
880 const struct ieee80211_reg_rule *rr;
881 const struct ieee80211_freq_range *fr = NULL;
882 const struct ieee80211_power_rule *pr = NULL;
884 rr = &regd->reg_rules[i];
885 fr = &rr->freq_range;
886 pr = &rr->power_rule;
889 * We only need to know if one frequency rule was
890 * was in center_freq's band, that's enough, so lets
891 * not overwrite it once found
893 if (!band_rule_found)
894 band_rule_found = freq_in_rule_band(fr, center_freq);
896 bw_fits = reg_does_bw_fit(fr,
897 center_freq,
898 desired_bw_khz);
900 if (band_rule_found && bw_fits) {
901 *reg_rule = rr;
902 return 0;
906 if (!band_rule_found)
907 return -ERANGE;
909 return -EINVAL;
911 EXPORT_SYMBOL(freq_reg_info);
913 int freq_reg_info(struct wiphy *wiphy,
914 u32 center_freq,
915 u32 desired_bw_khz,
916 const struct ieee80211_reg_rule **reg_rule)
918 assert_cfg80211_lock();
919 return freq_reg_info_regd(wiphy,
920 center_freq,
921 desired_bw_khz,
922 reg_rule,
923 NULL);
927 * Note that right now we assume the desired channel bandwidth
928 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
929 * per channel, the primary and the extension channel). To support
930 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
931 * new ieee80211_channel.target_bw and re run the regulatory check
932 * on the wiphy with the target_bw specified. Then we can simply use
933 * that below for the desired_bw_khz below.
935 static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
936 unsigned int chan_idx)
938 int r;
939 u32 flags, bw_flags = 0;
940 u32 desired_bw_khz = MHZ_TO_KHZ(20);
941 const struct ieee80211_reg_rule *reg_rule = NULL;
942 const struct ieee80211_power_rule *power_rule = NULL;
943 const struct ieee80211_freq_range *freq_range = NULL;
944 struct ieee80211_supported_band *sband;
945 struct ieee80211_channel *chan;
946 struct wiphy *request_wiphy = NULL;
948 assert_cfg80211_lock();
950 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
952 sband = wiphy->bands[band];
953 BUG_ON(chan_idx >= sband->n_channels);
954 chan = &sband->channels[chan_idx];
956 flags = chan->orig_flags;
958 r = freq_reg_info(wiphy,
959 MHZ_TO_KHZ(chan->center_freq),
960 desired_bw_khz,
961 &reg_rule);
963 if (r) {
965 * This means no regulatory rule was found in the country IE
966 * with a frequency range on the center_freq's band, since
967 * IEEE-802.11 allows for a country IE to have a subset of the
968 * regulatory information provided in a country we ignore
969 * disabling the channel unless at least one reg rule was
970 * found on the center_freq's band. For details see this
971 * clarification:
973 * http://tinyurl.com/11d-clarification
975 if (r == -ERANGE &&
976 last_request->initiator ==
977 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
978 #ifdef CONFIG_CFG80211_REG_DEBUG
979 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
980 "intact on %s - no rule found in band on "
981 "Country IE\n",
982 chan->center_freq, wiphy_name(wiphy));
983 #endif
984 } else {
986 * In this case we know the country IE has at least one reg rule
987 * for the band so we respect its band definitions
989 #ifdef CONFIG_CFG80211_REG_DEBUG
990 if (last_request->initiator ==
991 NL80211_REGDOM_SET_BY_COUNTRY_IE)
992 printk(KERN_DEBUG "cfg80211: Disabling "
993 "channel %d MHz on %s due to "
994 "Country IE\n",
995 chan->center_freq, wiphy_name(wiphy));
996 #endif
997 flags |= IEEE80211_CHAN_DISABLED;
998 chan->flags = flags;
1000 return;
1003 power_rule = &reg_rule->power_rule;
1004 freq_range = &reg_rule->freq_range;
1006 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1007 bw_flags = IEEE80211_CHAN_NO_HT40;
1009 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1010 request_wiphy && request_wiphy == wiphy &&
1011 request_wiphy->strict_regulatory) {
1013 * This gaurantees the driver's requested regulatory domain
1014 * will always be used as a base for further regulatory
1015 * settings
1017 chan->flags = chan->orig_flags =
1018 map_regdom_flags(reg_rule->flags) | bw_flags;
1019 chan->max_antenna_gain = chan->orig_mag =
1020 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1021 chan->max_power = chan->orig_mpwr =
1022 (int) MBM_TO_DBM(power_rule->max_eirp);
1023 return;
1026 chan->beacon_found = false;
1027 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
1028 chan->max_antenna_gain = min(chan->orig_mag,
1029 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
1030 if (chan->orig_mpwr)
1031 chan->max_power = min(chan->orig_mpwr,
1032 (int) MBM_TO_DBM(power_rule->max_eirp));
1033 else
1034 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1037 static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
1039 unsigned int i;
1040 struct ieee80211_supported_band *sband;
1042 BUG_ON(!wiphy->bands[band]);
1043 sband = wiphy->bands[band];
1045 for (i = 0; i < sband->n_channels; i++)
1046 handle_channel(wiphy, band, i);
1049 static bool ignore_reg_update(struct wiphy *wiphy,
1050 enum nl80211_reg_initiator initiator)
1052 if (!last_request)
1053 return true;
1054 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1055 wiphy->custom_regulatory)
1056 return true;
1058 * wiphy->regd will be set once the device has its own
1059 * desired regulatory domain set
1061 if (wiphy->strict_regulatory && !wiphy->regd &&
1062 !is_world_regdom(last_request->alpha2))
1063 return true;
1064 return false;
1067 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1069 struct cfg80211_registered_device *rdev;
1071 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1072 wiphy_update_regulatory(&rdev->wiphy, initiator);
1075 static void handle_reg_beacon(struct wiphy *wiphy,
1076 unsigned int chan_idx,
1077 struct reg_beacon *reg_beacon)
1079 struct ieee80211_supported_band *sband;
1080 struct ieee80211_channel *chan;
1081 bool channel_changed = false;
1082 struct ieee80211_channel chan_before;
1084 assert_cfg80211_lock();
1086 sband = wiphy->bands[reg_beacon->chan.band];
1087 chan = &sband->channels[chan_idx];
1089 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1090 return;
1092 if (chan->beacon_found)
1093 return;
1095 chan->beacon_found = true;
1097 if (wiphy->disable_beacon_hints)
1098 return;
1100 chan_before.center_freq = chan->center_freq;
1101 chan_before.flags = chan->flags;
1103 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
1104 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
1105 channel_changed = true;
1108 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
1109 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
1110 channel_changed = true;
1113 if (channel_changed)
1114 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
1118 * Called when a scan on a wiphy finds a beacon on
1119 * new channel
1121 static void wiphy_update_new_beacon(struct wiphy *wiphy,
1122 struct reg_beacon *reg_beacon)
1124 unsigned int i;
1125 struct ieee80211_supported_band *sband;
1127 assert_cfg80211_lock();
1129 if (!wiphy->bands[reg_beacon->chan.band])
1130 return;
1132 sband = wiphy->bands[reg_beacon->chan.band];
1134 for (i = 0; i < sband->n_channels; i++)
1135 handle_reg_beacon(wiphy, i, reg_beacon);
1139 * Called upon reg changes or a new wiphy is added
1141 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1143 unsigned int i;
1144 struct ieee80211_supported_band *sband;
1145 struct reg_beacon *reg_beacon;
1147 assert_cfg80211_lock();
1149 if (list_empty(&reg_beacon_list))
1150 return;
1152 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1153 if (!wiphy->bands[reg_beacon->chan.band])
1154 continue;
1155 sband = wiphy->bands[reg_beacon->chan.band];
1156 for (i = 0; i < sband->n_channels; i++)
1157 handle_reg_beacon(wiphy, i, reg_beacon);
1161 static bool reg_is_world_roaming(struct wiphy *wiphy)
1163 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1164 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1165 return true;
1166 if (last_request &&
1167 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1168 wiphy->custom_regulatory)
1169 return true;
1170 return false;
1173 /* Reap the advantages of previously found beacons */
1174 static void reg_process_beacons(struct wiphy *wiphy)
1177 * Means we are just firing up cfg80211, so no beacons would
1178 * have been processed yet.
1180 if (!last_request)
1181 return;
1182 if (!reg_is_world_roaming(wiphy))
1183 return;
1184 wiphy_update_beacon_reg(wiphy);
1187 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1189 if (!chan)
1190 return true;
1191 if (chan->flags & IEEE80211_CHAN_DISABLED)
1192 return true;
1193 /* This would happen when regulatory rules disallow HT40 completely */
1194 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1195 return true;
1196 return false;
1199 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1200 enum ieee80211_band band,
1201 unsigned int chan_idx)
1203 struct ieee80211_supported_band *sband;
1204 struct ieee80211_channel *channel;
1205 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1206 unsigned int i;
1208 assert_cfg80211_lock();
1210 sband = wiphy->bands[band];
1211 BUG_ON(chan_idx >= sband->n_channels);
1212 channel = &sband->channels[chan_idx];
1214 if (is_ht40_not_allowed(channel)) {
1215 channel->flags |= IEEE80211_CHAN_NO_HT40;
1216 return;
1220 * We need to ensure the extension channels exist to
1221 * be able to use HT40- or HT40+, this finds them (or not)
1223 for (i = 0; i < sband->n_channels; i++) {
1224 struct ieee80211_channel *c = &sband->channels[i];
1225 if (c->center_freq == (channel->center_freq - 20))
1226 channel_before = c;
1227 if (c->center_freq == (channel->center_freq + 20))
1228 channel_after = c;
1232 * Please note that this assumes target bandwidth is 20 MHz,
1233 * if that ever changes we also need to change the below logic
1234 * to include that as well.
1236 if (is_ht40_not_allowed(channel_before))
1237 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1238 else
1239 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1241 if (is_ht40_not_allowed(channel_after))
1242 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1243 else
1244 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1247 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1248 enum ieee80211_band band)
1250 unsigned int i;
1251 struct ieee80211_supported_band *sband;
1253 BUG_ON(!wiphy->bands[band]);
1254 sband = wiphy->bands[band];
1256 for (i = 0; i < sband->n_channels; i++)
1257 reg_process_ht_flags_channel(wiphy, band, i);
1260 static void reg_process_ht_flags(struct wiphy *wiphy)
1262 enum ieee80211_band band;
1264 if (!wiphy)
1265 return;
1267 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1268 if (wiphy->bands[band])
1269 reg_process_ht_flags_band(wiphy, band);
1274 void wiphy_update_regulatory(struct wiphy *wiphy,
1275 enum nl80211_reg_initiator initiator)
1277 enum ieee80211_band band;
1279 if (ignore_reg_update(wiphy, initiator))
1280 goto out;
1281 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1282 if (wiphy->bands[band])
1283 handle_band(wiphy, band);
1285 out:
1286 reg_process_beacons(wiphy);
1287 reg_process_ht_flags(wiphy);
1288 if (wiphy->reg_notifier)
1289 wiphy->reg_notifier(wiphy, last_request);
1292 static void handle_channel_custom(struct wiphy *wiphy,
1293 enum ieee80211_band band,
1294 unsigned int chan_idx,
1295 const struct ieee80211_regdomain *regd)
1297 int r;
1298 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1299 u32 bw_flags = 0;
1300 const struct ieee80211_reg_rule *reg_rule = NULL;
1301 const struct ieee80211_power_rule *power_rule = NULL;
1302 const struct ieee80211_freq_range *freq_range = NULL;
1303 struct ieee80211_supported_band *sband;
1304 struct ieee80211_channel *chan;
1306 assert_reg_lock();
1308 sband = wiphy->bands[band];
1309 BUG_ON(chan_idx >= sband->n_channels);
1310 chan = &sband->channels[chan_idx];
1312 r = freq_reg_info_regd(wiphy,
1313 MHZ_TO_KHZ(chan->center_freq),
1314 desired_bw_khz,
1315 &reg_rule,
1316 regd);
1318 if (r) {
1319 chan->flags = IEEE80211_CHAN_DISABLED;
1320 return;
1323 power_rule = &reg_rule->power_rule;
1324 freq_range = &reg_rule->freq_range;
1326 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1327 bw_flags = IEEE80211_CHAN_NO_HT40;
1329 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1330 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1331 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1334 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1335 const struct ieee80211_regdomain *regd)
1337 unsigned int i;
1338 struct ieee80211_supported_band *sband;
1340 BUG_ON(!wiphy->bands[band]);
1341 sband = wiphy->bands[band];
1343 for (i = 0; i < sband->n_channels; i++)
1344 handle_channel_custom(wiphy, band, i, regd);
1347 /* Used by drivers prior to wiphy registration */
1348 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1349 const struct ieee80211_regdomain *regd)
1351 enum ieee80211_band band;
1352 unsigned int bands_set = 0;
1354 mutex_lock(&reg_mutex);
1355 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1356 if (!wiphy->bands[band])
1357 continue;
1358 handle_band_custom(wiphy, band, regd);
1359 bands_set++;
1361 mutex_unlock(&reg_mutex);
1364 * no point in calling this if it won't have any effect
1365 * on your device's supportd bands.
1367 WARN_ON(!bands_set);
1369 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1371 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
1372 const struct ieee80211_regdomain *src_regd)
1374 struct ieee80211_regdomain *regd;
1375 int size_of_regd = 0;
1376 unsigned int i;
1378 size_of_regd = sizeof(struct ieee80211_regdomain) +
1379 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
1381 regd = kzalloc(size_of_regd, GFP_KERNEL);
1382 if (!regd)
1383 return -ENOMEM;
1385 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
1387 for (i = 0; i < src_regd->n_reg_rules; i++)
1388 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
1389 sizeof(struct ieee80211_reg_rule));
1391 *dst_regd = regd;
1392 return 0;
1396 * Return value which can be used by ignore_request() to indicate
1397 * it has been determined we should intersect two regulatory domains
1399 #define REG_INTERSECT 1
1401 /* This has the logic which determines when a new request
1402 * should be ignored. */
1403 static int ignore_request(struct wiphy *wiphy,
1404 struct regulatory_request *pending_request)
1406 struct wiphy *last_wiphy = NULL;
1408 assert_cfg80211_lock();
1410 /* All initial requests are respected */
1411 if (!last_request)
1412 return 0;
1414 switch (pending_request->initiator) {
1415 case NL80211_REGDOM_SET_BY_CORE:
1416 return -EINVAL;
1417 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1419 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1421 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1422 return -EINVAL;
1423 if (last_request->initiator ==
1424 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1425 if (last_wiphy != wiphy) {
1427 * Two cards with two APs claiming different
1428 * Country IE alpha2s. We could
1429 * intersect them, but that seems unlikely
1430 * to be correct. Reject second one for now.
1432 if (regdom_changes(pending_request->alpha2))
1433 return -EOPNOTSUPP;
1434 return -EALREADY;
1437 * Two consecutive Country IE hints on the same wiphy.
1438 * This should be picked up early by the driver/stack
1440 if (WARN_ON(regdom_changes(pending_request->alpha2)))
1441 return 0;
1442 return -EALREADY;
1444 return REG_INTERSECT;
1445 case NL80211_REGDOM_SET_BY_DRIVER:
1446 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1447 if (is_old_static_regdom(cfg80211_regdomain))
1448 return 0;
1449 if (regdom_changes(pending_request->alpha2))
1450 return 0;
1451 return -EALREADY;
1455 * This would happen if you unplug and plug your card
1456 * back in or if you add a new device for which the previously
1457 * loaded card also agrees on the regulatory domain.
1459 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1460 !regdom_changes(pending_request->alpha2))
1461 return -EALREADY;
1463 return REG_INTERSECT;
1464 case NL80211_REGDOM_SET_BY_USER:
1465 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1466 return REG_INTERSECT;
1468 * If the user knows better the user should set the regdom
1469 * to their country before the IE is picked up
1471 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1472 last_request->intersect)
1473 return -EOPNOTSUPP;
1475 * Process user requests only after previous user/driver/core
1476 * requests have been processed
1478 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1479 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1480 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1481 if (regdom_changes(last_request->alpha2))
1482 return -EAGAIN;
1485 if (!is_old_static_regdom(cfg80211_regdomain) &&
1486 !regdom_changes(pending_request->alpha2))
1487 return -EALREADY;
1489 return 0;
1492 return -EINVAL;
1496 * __regulatory_hint - hint to the wireless core a regulatory domain
1497 * @wiphy: if the hint comes from country information from an AP, this
1498 * is required to be set to the wiphy that received the information
1499 * @pending_request: the regulatory request currently being processed
1501 * The Wireless subsystem can use this function to hint to the wireless core
1502 * what it believes should be the current regulatory domain.
1504 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1505 * already been set or other standard error codes.
1507 * Caller must hold &cfg80211_mutex and &reg_mutex
1509 static int __regulatory_hint(struct wiphy *wiphy,
1510 struct regulatory_request *pending_request)
1512 bool intersect = false;
1513 int r = 0;
1515 assert_cfg80211_lock();
1517 r = ignore_request(wiphy, pending_request);
1519 if (r == REG_INTERSECT) {
1520 if (pending_request->initiator ==
1521 NL80211_REGDOM_SET_BY_DRIVER) {
1522 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1523 if (r) {
1524 kfree(pending_request);
1525 return r;
1528 intersect = true;
1529 } else if (r) {
1531 * If the regulatory domain being requested by the
1532 * driver has already been set just copy it to the
1533 * wiphy
1535 if (r == -EALREADY &&
1536 pending_request->initiator ==
1537 NL80211_REGDOM_SET_BY_DRIVER) {
1538 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1539 if (r) {
1540 kfree(pending_request);
1541 return r;
1543 r = -EALREADY;
1544 goto new_request;
1546 kfree(pending_request);
1547 return r;
1550 new_request:
1551 kfree(last_request);
1553 last_request = pending_request;
1554 last_request->intersect = intersect;
1556 pending_request = NULL;
1558 /* When r == REG_INTERSECT we do need to call CRDA */
1559 if (r < 0) {
1561 * Since CRDA will not be called in this case as we already
1562 * have applied the requested regulatory domain before we just
1563 * inform userspace we have processed the request
1565 if (r == -EALREADY)
1566 nl80211_send_reg_change_event(last_request);
1567 return r;
1570 return call_crda(last_request->alpha2);
1573 /* This processes *all* regulatory hints */
1574 static void reg_process_hint(struct regulatory_request *reg_request)
1576 int r = 0;
1577 struct wiphy *wiphy = NULL;
1579 BUG_ON(!reg_request->alpha2);
1581 mutex_lock(&cfg80211_mutex);
1582 mutex_lock(&reg_mutex);
1584 if (wiphy_idx_valid(reg_request->wiphy_idx))
1585 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1587 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1588 !wiphy) {
1589 kfree(reg_request);
1590 goto out;
1593 r = __regulatory_hint(wiphy, reg_request);
1594 /* This is required so that the orig_* parameters are saved */
1595 if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
1596 wiphy_update_regulatory(wiphy, reg_request->initiator);
1597 out:
1598 mutex_unlock(&reg_mutex);
1599 mutex_unlock(&cfg80211_mutex);
1602 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
1603 static void reg_process_pending_hints(void)
1605 struct regulatory_request *reg_request;
1607 spin_lock(&reg_requests_lock);
1608 while (!list_empty(&reg_requests_list)) {
1609 reg_request = list_first_entry(&reg_requests_list,
1610 struct regulatory_request,
1611 list);
1612 list_del_init(&reg_request->list);
1614 spin_unlock(&reg_requests_lock);
1615 reg_process_hint(reg_request);
1616 spin_lock(&reg_requests_lock);
1618 spin_unlock(&reg_requests_lock);
1621 /* Processes beacon hints -- this has nothing to do with country IEs */
1622 static void reg_process_pending_beacon_hints(void)
1624 struct cfg80211_registered_device *rdev;
1625 struct reg_beacon *pending_beacon, *tmp;
1628 * No need to hold the reg_mutex here as we just touch wiphys
1629 * and do not read or access regulatory variables.
1631 mutex_lock(&cfg80211_mutex);
1633 /* This goes through the _pending_ beacon list */
1634 spin_lock_bh(&reg_pending_beacons_lock);
1636 if (list_empty(&reg_pending_beacons)) {
1637 spin_unlock_bh(&reg_pending_beacons_lock);
1638 goto out;
1641 list_for_each_entry_safe(pending_beacon, tmp,
1642 &reg_pending_beacons, list) {
1644 list_del_init(&pending_beacon->list);
1646 /* Applies the beacon hint to current wiphys */
1647 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1648 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1650 /* Remembers the beacon hint for new wiphys or reg changes */
1651 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1654 spin_unlock_bh(&reg_pending_beacons_lock);
1655 out:
1656 mutex_unlock(&cfg80211_mutex);
1659 static void reg_todo(struct work_struct *work)
1661 reg_process_pending_hints();
1662 reg_process_pending_beacon_hints();
1665 static DECLARE_WORK(reg_work, reg_todo);
1667 static void queue_regulatory_request(struct regulatory_request *request)
1669 spin_lock(&reg_requests_lock);
1670 list_add_tail(&request->list, &reg_requests_list);
1671 spin_unlock(&reg_requests_lock);
1673 schedule_work(&reg_work);
1676 /* Core regulatory hint -- happens once during cfg80211_init() */
1677 static int regulatory_hint_core(const char *alpha2)
1679 struct regulatory_request *request;
1681 BUG_ON(last_request);
1683 request = kzalloc(sizeof(struct regulatory_request),
1684 GFP_KERNEL);
1685 if (!request)
1686 return -ENOMEM;
1688 request->alpha2[0] = alpha2[0];
1689 request->alpha2[1] = alpha2[1];
1690 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1692 queue_regulatory_request(request);
1695 * This ensures last_request is populated once modules
1696 * come swinging in and calling regulatory hints and
1697 * wiphy_apply_custom_regulatory().
1699 flush_scheduled_work();
1701 return 0;
1704 /* User hints */
1705 int regulatory_hint_user(const char *alpha2)
1707 struct regulatory_request *request;
1709 BUG_ON(!alpha2);
1711 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1712 if (!request)
1713 return -ENOMEM;
1715 request->wiphy_idx = WIPHY_IDX_STALE;
1716 request->alpha2[0] = alpha2[0];
1717 request->alpha2[1] = alpha2[1];
1718 request->initiator = NL80211_REGDOM_SET_BY_USER;
1720 queue_regulatory_request(request);
1722 return 0;
1725 /* Driver hints */
1726 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1728 struct regulatory_request *request;
1730 BUG_ON(!alpha2);
1731 BUG_ON(!wiphy);
1733 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1734 if (!request)
1735 return -ENOMEM;
1737 request->wiphy_idx = get_wiphy_idx(wiphy);
1739 /* Must have registered wiphy first */
1740 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1742 request->alpha2[0] = alpha2[0];
1743 request->alpha2[1] = alpha2[1];
1744 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1746 queue_regulatory_request(request);
1748 return 0;
1750 EXPORT_SYMBOL(regulatory_hint);
1752 /* Caller must hold reg_mutex */
1753 static bool reg_same_country_ie_hint(struct wiphy *wiphy,
1754 u32 country_ie_checksum)
1756 struct wiphy *request_wiphy;
1758 assert_reg_lock();
1760 if (unlikely(last_request->initiator !=
1761 NL80211_REGDOM_SET_BY_COUNTRY_IE))
1762 return false;
1764 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1766 if (!request_wiphy)
1767 return false;
1769 if (likely(request_wiphy != wiphy))
1770 return !country_ie_integrity_changes(country_ie_checksum);
1772 * We should not have let these through at this point, they
1773 * should have been picked up earlier by the first alpha2 check
1774 * on the device
1776 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
1777 return true;
1778 return false;
1782 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1783 * therefore cannot iterate over the rdev list here.
1785 void regulatory_hint_11d(struct wiphy *wiphy,
1786 u8 *country_ie,
1787 u8 country_ie_len)
1789 struct ieee80211_regdomain *rd = NULL;
1790 char alpha2[2];
1791 u32 checksum = 0;
1792 enum environment_cap env = ENVIRON_ANY;
1793 struct regulatory_request *request;
1795 mutex_lock(&reg_mutex);
1797 if (unlikely(!last_request))
1798 goto out;
1800 /* IE len must be evenly divisible by 2 */
1801 if (country_ie_len & 0x01)
1802 goto out;
1804 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1805 goto out;
1808 * Pending country IE processing, this can happen after we
1809 * call CRDA and wait for a response if a beacon was received before
1810 * we were able to process the last regulatory_hint_11d() call
1812 if (country_ie_regdomain)
1813 goto out;
1815 alpha2[0] = country_ie[0];
1816 alpha2[1] = country_ie[1];
1818 if (country_ie[2] == 'I')
1819 env = ENVIRON_INDOOR;
1820 else if (country_ie[2] == 'O')
1821 env = ENVIRON_OUTDOOR;
1824 * We will run this only upon a successful connection on cfg80211.
1825 * We leave conflict resolution to the workqueue, where can hold
1826 * cfg80211_mutex.
1828 if (likely(last_request->initiator ==
1829 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1830 wiphy_idx_valid(last_request->wiphy_idx)))
1831 goto out;
1833 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
1834 if (!rd)
1835 goto out;
1838 * This will not happen right now but we leave it here for the
1839 * the future when we want to add suspend/resume support and having
1840 * the user move to another country after doing so, or having the user
1841 * move to another AP. Right now we just trust the first AP.
1843 * If we hit this before we add this support we want to be informed of
1844 * it as it would indicate a mistake in the current design
1846 if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))
1847 goto free_rd_out;
1849 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1850 if (!request)
1851 goto free_rd_out;
1854 * We keep this around for when CRDA comes back with a response so
1855 * we can intersect with that
1857 country_ie_regdomain = rd;
1859 request->wiphy_idx = get_wiphy_idx(wiphy);
1860 request->alpha2[0] = rd->alpha2[0];
1861 request->alpha2[1] = rd->alpha2[1];
1862 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1863 request->country_ie_checksum = checksum;
1864 request->country_ie_env = env;
1866 mutex_unlock(&reg_mutex);
1868 queue_regulatory_request(request);
1870 return;
1872 free_rd_out:
1873 kfree(rd);
1874 out:
1875 mutex_unlock(&reg_mutex);
1878 static bool freq_is_chan_12_13_14(u16 freq)
1880 if (freq == ieee80211_channel_to_frequency(12) ||
1881 freq == ieee80211_channel_to_frequency(13) ||
1882 freq == ieee80211_channel_to_frequency(14))
1883 return true;
1884 return false;
1887 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1888 struct ieee80211_channel *beacon_chan,
1889 gfp_t gfp)
1891 struct reg_beacon *reg_beacon;
1893 if (likely((beacon_chan->beacon_found ||
1894 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1895 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1896 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1897 return 0;
1899 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1900 if (!reg_beacon)
1901 return -ENOMEM;
1903 #ifdef CONFIG_CFG80211_REG_DEBUG
1904 printk(KERN_DEBUG "cfg80211: Found new beacon on "
1905 "frequency: %d MHz (Ch %d) on %s\n",
1906 beacon_chan->center_freq,
1907 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1908 wiphy_name(wiphy));
1909 #endif
1910 memcpy(&reg_beacon->chan, beacon_chan,
1911 sizeof(struct ieee80211_channel));
1915 * Since we can be called from BH or and non-BH context
1916 * we must use spin_lock_bh()
1918 spin_lock_bh(&reg_pending_beacons_lock);
1919 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1920 spin_unlock_bh(&reg_pending_beacons_lock);
1922 schedule_work(&reg_work);
1924 return 0;
1927 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1929 unsigned int i;
1930 const struct ieee80211_reg_rule *reg_rule = NULL;
1931 const struct ieee80211_freq_range *freq_range = NULL;
1932 const struct ieee80211_power_rule *power_rule = NULL;
1934 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
1935 "(max_antenna_gain, max_eirp)\n");
1937 for (i = 0; i < rd->n_reg_rules; i++) {
1938 reg_rule = &rd->reg_rules[i];
1939 freq_range = &reg_rule->freq_range;
1940 power_rule = &reg_rule->power_rule;
1943 * There may not be documentation for max antenna gain
1944 * in certain regions
1946 if (power_rule->max_antenna_gain)
1947 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1948 "(%d mBi, %d mBm)\n",
1949 freq_range->start_freq_khz,
1950 freq_range->end_freq_khz,
1951 freq_range->max_bandwidth_khz,
1952 power_rule->max_antenna_gain,
1953 power_rule->max_eirp);
1954 else
1955 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1956 "(N/A, %d mBm)\n",
1957 freq_range->start_freq_khz,
1958 freq_range->end_freq_khz,
1959 freq_range->max_bandwidth_khz,
1960 power_rule->max_eirp);
1964 static void print_regdomain(const struct ieee80211_regdomain *rd)
1967 if (is_intersected_alpha2(rd->alpha2)) {
1969 if (last_request->initiator ==
1970 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1971 struct cfg80211_registered_device *rdev;
1972 rdev = cfg80211_rdev_by_wiphy_idx(
1973 last_request->wiphy_idx);
1974 if (rdev) {
1975 printk(KERN_INFO "cfg80211: Current regulatory "
1976 "domain updated by AP to: %c%c\n",
1977 rdev->country_ie_alpha2[0],
1978 rdev->country_ie_alpha2[1]);
1979 } else
1980 printk(KERN_INFO "cfg80211: Current regulatory "
1981 "domain intersected: \n");
1982 } else
1983 printk(KERN_INFO "cfg80211: Current regulatory "
1984 "domain intersected: \n");
1985 } else if (is_world_regdom(rd->alpha2))
1986 printk(KERN_INFO "cfg80211: World regulatory "
1987 "domain updated:\n");
1988 else {
1989 if (is_unknown_alpha2(rd->alpha2))
1990 printk(KERN_INFO "cfg80211: Regulatory domain "
1991 "changed to driver built-in settings "
1992 "(unknown country)\n");
1993 else
1994 printk(KERN_INFO "cfg80211: Regulatory domain "
1995 "changed to country: %c%c\n",
1996 rd->alpha2[0], rd->alpha2[1]);
1998 print_rd_rules(rd);
2001 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
2003 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
2004 rd->alpha2[0], rd->alpha2[1]);
2005 print_rd_rules(rd);
2008 #ifdef CONFIG_CFG80211_REG_DEBUG
2009 static void reg_country_ie_process_debug(
2010 const struct ieee80211_regdomain *rd,
2011 const struct ieee80211_regdomain *country_ie_regdomain,
2012 const struct ieee80211_regdomain *intersected_rd)
2014 printk(KERN_DEBUG "cfg80211: Received country IE:\n");
2015 print_regdomain_info(country_ie_regdomain);
2016 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
2017 print_regdomain_info(rd);
2018 if (intersected_rd) {
2019 printk(KERN_DEBUG "cfg80211: We intersect both of these "
2020 "and get:\n");
2021 print_regdomain_info(intersected_rd);
2022 return;
2024 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
2026 #else
2027 static inline void reg_country_ie_process_debug(
2028 const struct ieee80211_regdomain *rd,
2029 const struct ieee80211_regdomain *country_ie_regdomain,
2030 const struct ieee80211_regdomain *intersected_rd)
2033 #endif
2035 /* Takes ownership of rd only if it doesn't fail */
2036 static int __set_regdom(const struct ieee80211_regdomain *rd)
2038 const struct ieee80211_regdomain *intersected_rd = NULL;
2039 struct cfg80211_registered_device *rdev = NULL;
2040 struct wiphy *request_wiphy;
2041 /* Some basic sanity checks first */
2043 if (is_world_regdom(rd->alpha2)) {
2044 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2045 return -EINVAL;
2046 update_world_regdomain(rd);
2047 return 0;
2050 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2051 !is_unknown_alpha2(rd->alpha2))
2052 return -EINVAL;
2054 if (!last_request)
2055 return -EINVAL;
2058 * Lets only bother proceeding on the same alpha2 if the current
2059 * rd is non static (it means CRDA was present and was used last)
2060 * and the pending request came in from a country IE
2062 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2064 * If someone else asked us to change the rd lets only bother
2065 * checking if the alpha2 changes if CRDA was already called
2067 if (!is_old_static_regdom(cfg80211_regdomain) &&
2068 !regdom_changes(rd->alpha2))
2069 return -EINVAL;
2073 * Now lets set the regulatory domain, update all driver channels
2074 * and finally inform them of what we have done, in case they want
2075 * to review or adjust their own settings based on their own
2076 * internal EEPROM data
2079 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2080 return -EINVAL;
2082 if (!is_valid_rd(rd)) {
2083 printk(KERN_ERR "cfg80211: Invalid "
2084 "regulatory domain detected:\n");
2085 print_regdomain_info(rd);
2086 return -EINVAL;
2089 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2091 if (!last_request->intersect) {
2092 int r;
2094 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
2095 reset_regdomains();
2096 cfg80211_regdomain = rd;
2097 return 0;
2101 * For a driver hint, lets copy the regulatory domain the
2102 * driver wanted to the wiphy to deal with conflicts
2106 * Userspace could have sent two replies with only
2107 * one kernel request.
2109 if (request_wiphy->regd)
2110 return -EALREADY;
2112 r = reg_copy_regd(&request_wiphy->regd, rd);
2113 if (r)
2114 return r;
2116 reset_regdomains();
2117 cfg80211_regdomain = rd;
2118 return 0;
2121 /* Intersection requires a bit more work */
2123 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2125 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2126 if (!intersected_rd)
2127 return -EINVAL;
2130 * We can trash what CRDA provided now.
2131 * However if a driver requested this specific regulatory
2132 * domain we keep it for its private use
2134 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
2135 request_wiphy->regd = rd;
2136 else
2137 kfree(rd);
2139 rd = NULL;
2141 reset_regdomains();
2142 cfg80211_regdomain = intersected_rd;
2144 return 0;
2148 * Country IE requests are handled a bit differently, we intersect
2149 * the country IE rd with what CRDA believes that country should have
2153 * Userspace could have sent two replies with only
2154 * one kernel request. By the second reply we would have
2155 * already processed and consumed the country_ie_regdomain.
2157 if (!country_ie_regdomain)
2158 return -EALREADY;
2159 BUG_ON(rd == country_ie_regdomain);
2162 * Intersect what CRDA returned and our what we
2163 * had built from the Country IE received
2166 intersected_rd = regdom_intersect(rd, country_ie_regdomain);
2168 reg_country_ie_process_debug(rd,
2169 country_ie_regdomain,
2170 intersected_rd);
2172 kfree(country_ie_regdomain);
2173 country_ie_regdomain = NULL;
2175 if (!intersected_rd)
2176 return -EINVAL;
2178 rdev = wiphy_to_dev(request_wiphy);
2180 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2181 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2182 rdev->env = last_request->country_ie_env;
2184 BUG_ON(intersected_rd == rd);
2186 kfree(rd);
2187 rd = NULL;
2189 reset_regdomains();
2190 cfg80211_regdomain = intersected_rd;
2192 return 0;
2197 * Use this call to set the current regulatory domain. Conflicts with
2198 * multiple drivers can be ironed out later. Caller must've already
2199 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2201 int set_regdom(const struct ieee80211_regdomain *rd)
2203 int r;
2205 assert_cfg80211_lock();
2207 mutex_lock(&reg_mutex);
2209 /* Note that this doesn't update the wiphys, this is done below */
2210 r = __set_regdom(rd);
2211 if (r) {
2212 kfree(rd);
2213 mutex_unlock(&reg_mutex);
2214 return r;
2217 /* This would make this whole thing pointless */
2218 if (!last_request->intersect)
2219 BUG_ON(rd != cfg80211_regdomain);
2221 /* update all wiphys now with the new established regulatory domain */
2222 update_all_wiphy_regulatory(last_request->initiator);
2224 print_regdomain(cfg80211_regdomain);
2226 nl80211_send_reg_change_event(last_request);
2228 mutex_unlock(&reg_mutex);
2230 return r;
2233 /* Caller must hold cfg80211_mutex */
2234 void reg_device_remove(struct wiphy *wiphy)
2236 struct wiphy *request_wiphy = NULL;
2238 assert_cfg80211_lock();
2240 mutex_lock(&reg_mutex);
2242 kfree(wiphy->regd);
2244 if (last_request)
2245 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2247 if (!request_wiphy || request_wiphy != wiphy)
2248 goto out;
2250 last_request->wiphy_idx = WIPHY_IDX_STALE;
2251 last_request->country_ie_env = ENVIRON_ANY;
2252 out:
2253 mutex_unlock(&reg_mutex);
2256 int regulatory_init(void)
2258 int err = 0;
2260 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2261 if (IS_ERR(reg_pdev))
2262 return PTR_ERR(reg_pdev);
2264 spin_lock_init(&reg_requests_lock);
2265 spin_lock_init(&reg_pending_beacons_lock);
2267 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
2268 cfg80211_regdomain = static_regdom(ieee80211_regdom);
2270 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
2271 print_regdomain_info(cfg80211_regdomain);
2272 #else
2273 cfg80211_regdomain = cfg80211_world_regdom;
2275 #endif
2276 /* We always try to get an update for the static regdomain */
2277 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2278 if (err) {
2279 if (err == -ENOMEM)
2280 return err;
2282 * N.B. kobject_uevent_env() can fail mainly for when we're out
2283 * memory which is handled and propagated appropriately above
2284 * but it can also fail during a netlink_broadcast() or during
2285 * early boot for call_usermodehelper(). For now treat these
2286 * errors as non-fatal.
2288 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
2289 "to call CRDA during init");
2290 #ifdef CONFIG_CFG80211_REG_DEBUG
2291 /* We want to find out exactly why when debugging */
2292 WARN_ON(err);
2293 #endif
2297 * Finally, if the user set the module parameter treat it
2298 * as a user hint.
2300 if (!is_world_regdom(ieee80211_regdom))
2301 regulatory_hint_user(ieee80211_regdom);
2303 return 0;
2306 void regulatory_exit(void)
2308 struct regulatory_request *reg_request, *tmp;
2309 struct reg_beacon *reg_beacon, *btmp;
2311 cancel_work_sync(&reg_work);
2313 mutex_lock(&cfg80211_mutex);
2314 mutex_lock(&reg_mutex);
2316 reset_regdomains();
2318 kfree(country_ie_regdomain);
2319 country_ie_regdomain = NULL;
2321 kfree(last_request);
2323 platform_device_unregister(reg_pdev);
2325 spin_lock_bh(&reg_pending_beacons_lock);
2326 if (!list_empty(&reg_pending_beacons)) {
2327 list_for_each_entry_safe(reg_beacon, btmp,
2328 &reg_pending_beacons, list) {
2329 list_del(&reg_beacon->list);
2330 kfree(reg_beacon);
2333 spin_unlock_bh(&reg_pending_beacons_lock);
2335 if (!list_empty(&reg_beacon_list)) {
2336 list_for_each_entry_safe(reg_beacon, btmp,
2337 &reg_beacon_list, list) {
2338 list_del(&reg_beacon->list);
2339 kfree(reg_beacon);
2343 spin_lock(&reg_requests_lock);
2344 if (!list_empty(&reg_requests_list)) {
2345 list_for_each_entry_safe(reg_request, tmp,
2346 &reg_requests_list, list) {
2347 list_del(&reg_request->list);
2348 kfree(reg_request);
2351 spin_unlock(&reg_requests_lock);
2353 mutex_unlock(&reg_mutex);
2354 mutex_unlock(&cfg80211_mutex);