?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'akpm'
[linux-2.6/next.git] / net / wireless / reg.c
blob9f3aa5cabdefec4102d2c3f5bca167c62cbc8bdf
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>
6 *
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.
10 */
11
12 /**
13 * DOC: Wireless regulatory infrastructure
14 *
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.
19 *
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.
23 *
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.
29 *
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.
33 *
34 */
35
36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
37
38 #include <linux/kernel.h>
39 #include <linux/slab.h>
40 #include <linux/list.h>
41 #include <linux/random.h>
42 #include <linux/ctype.h>
43 #include <linux/nl80211.h>
44 #include <linux/platform_device.h>
45 #include <net/cfg80211.h>
46 #include "core.h"
47 #include "reg.h"
48 #include "regdb.h"
49 #include "nl80211.h"
50
51 #ifdef CONFIG_CFG80211_REG_DEBUG
52 #define REG_DBG_PRINT(format, args...) \
53 printk(KERN_DEBUG pr_fmt(format), ##args)
54 #else
55 #define REG_DBG_PRINT(args...)
56 #endif
57
58 /* Receipt of information from last regulatory request */
59 static struct regulatory_request *last_request;
60
61 /* To trigger userspace events */
62 static struct platform_device *reg_pdev;
63
64 static struct device_type reg_device_type = {
65 .uevent = reg_device_uevent,
66 };
67
68 /*
69 * Central wireless core regulatory domains, we only need two,
70 * the current one and a world regulatory domain in case we have no
71 * information to give us an alpha2
72 */
73 const struct ieee80211_regdomain *cfg80211_regdomain;
74
75 /*
76 * Protects static reg.c components:
77 * - cfg80211_world_regdom
78 * - cfg80211_regdom
79 * - last_request
80 */
81 static DEFINE_MUTEX(reg_mutex);
82
83 static inline void assert_reg_lock(void)
84 {
85 lockdep_assert_held(&reg_mutex);
86 }
87
88 /* Used to queue up regulatory hints */
89 static LIST_HEAD(reg_requests_list);
90 static spinlock_t reg_requests_lock;
91
92 /* Used to queue up beacon hints for review */
93 static LIST_HEAD(reg_pending_beacons);
94 static spinlock_t reg_pending_beacons_lock;
95
96 /* Used to keep track of processed beacon hints */
97 static LIST_HEAD(reg_beacon_list);
98
99 struct reg_beacon {
100 struct list_head list;
101 struct ieee80211_channel chan;
102 };
103
104 static void reg_todo(struct work_struct *work);
105 static DECLARE_WORK(reg_work, reg_todo);
106
107 static void reg_timeout_work(struct work_struct *work);
108 static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
109
110 /* We keep a static world regulatory domain in case of the absence of CRDA */
111 static const struct ieee80211_regdomain world_regdom = {
112 .n_reg_rules = 5,
113 .alpha2 = "00",
114 .reg_rules = {
115 /* IEEE 802.11b/g, channels 1..11 */
116 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
117 /* IEEE 802.11b/g, channels 12..13. No HT40
118 * channel fits here. */
119 REG_RULE(2467-10, 2472+10, 20, 6, 20,
120 NL80211_RRF_PASSIVE_SCAN |
121 NL80211_RRF_NO_IBSS),
122 /* IEEE 802.11 channel 14 - Only JP enables
123 * this and for 802.11b only */
124 REG_RULE(2484-10, 2484+10, 20, 6, 20,
125 NL80211_RRF_PASSIVE_SCAN |
126 NL80211_RRF_NO_IBSS |
127 NL80211_RRF_NO_OFDM),
128 /* IEEE 802.11a, channel 36..48 */
129 REG_RULE(5180-10, 5240+10, 40, 6, 20,
130 NL80211_RRF_PASSIVE_SCAN |
131 NL80211_RRF_NO_IBSS),
132
133 /* NB: 5260 MHz - 5700 MHz requies DFS */
134
135 /* IEEE 802.11a, channel 149..165 */
136 REG_RULE(5745-10, 5825+10, 40, 6, 20,
137 NL80211_RRF_PASSIVE_SCAN |
138 NL80211_RRF_NO_IBSS),
139 }
140 };
141
142 static const struct ieee80211_regdomain *cfg80211_world_regdom =
143 &world_regdom;
144
145 static char *ieee80211_regdom = "00";
146 static char user_alpha2[2];
147
148 module_param(ieee80211_regdom, charp, 0444);
149 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
150
151 static void reset_regdomains(void)
152 {
153 /* avoid freeing static information or freeing something twice */
154 if (cfg80211_regdomain == cfg80211_world_regdom)
155 cfg80211_regdomain = NULL;
156 if (cfg80211_world_regdom == &world_regdom)
157 cfg80211_world_regdom = NULL;
158 if (cfg80211_regdomain == &world_regdom)
159 cfg80211_regdomain = NULL;
160
161 kfree(cfg80211_regdomain);
162 kfree(cfg80211_world_regdom);
163
164 cfg80211_world_regdom = &world_regdom;
165 cfg80211_regdomain = NULL;
166 }
167
168 /*
169 * Dynamic world regulatory domain requested by the wireless
170 * core upon initialization
171 */
172 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
173 {
174 BUG_ON(!last_request);
175
176 reset_regdomains();
177
178 cfg80211_world_regdom = rd;
179 cfg80211_regdomain = rd;
180 }
181
182 bool is_world_regdom(const char *alpha2)
183 {
184 if (!alpha2)
185 return false;
186 if (alpha2[0] == '0' && alpha2[1] == '0')
187 return true;
188 return false;
189 }
190
191 static bool is_alpha2_set(const char *alpha2)
192 {
193 if (!alpha2)
194 return false;
195 if (alpha2[0] != 0 && alpha2[1] != 0)
196 return true;
197 return false;
198 }
199
200 static bool is_unknown_alpha2(const char *alpha2)
201 {
202 if (!alpha2)
203 return false;
204 /*
205 * Special case where regulatory domain was built by driver
206 * but a specific alpha2 cannot be determined
207 */
208 if (alpha2[0] == '9' && alpha2[1] == '9')
209 return true;
210 return false;
211 }
212
213 static bool is_intersected_alpha2(const char *alpha2)
214 {
215 if (!alpha2)
216 return false;
217 /*
218 * Special case where regulatory domain is the
219 * result of an intersection between two regulatory domain
220 * structures
221 */
222 if (alpha2[0] == '9' && alpha2[1] == '8')
223 return true;
224 return false;
225 }
226
227 static bool is_an_alpha2(const char *alpha2)
228 {
229 if (!alpha2)
230 return false;
231 if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
232 return true;
233 return false;
234 }
235
236 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
237 {
238 if (!alpha2_x || !alpha2_y)
239 return false;
240 if (alpha2_x[0] == alpha2_y[0] &&
241 alpha2_x[1] == alpha2_y[1])
242 return true;
243 return false;
244 }
245
246 static bool regdom_changes(const char *alpha2)
247 {
248 assert_cfg80211_lock();
249
250 if (!cfg80211_regdomain)
251 return true;
252 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
253 return false;
254 return true;
255 }
256
257 /*
258 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
259 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
260 * has ever been issued.
261 */
262 static bool is_user_regdom_saved(void)
263 {
264 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
265 return false;
266
267 /* This would indicate a mistake on the design */
268 if (WARN((!is_world_regdom(user_alpha2) &&
269 !is_an_alpha2(user_alpha2)),
270 "Unexpected user alpha2: %c%c\n",
271 user_alpha2[0],
272 user_alpha2[1]))
273 return false;
274
275 return true;
276 }
277
278 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
279 const struct ieee80211_regdomain *src_regd)
280 {
281 struct ieee80211_regdomain *regd;
282 int size_of_regd = 0;
283 unsigned int i;
284
285 size_of_regd = sizeof(struct ieee80211_regdomain) +
286 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
287
288 regd = kzalloc(size_of_regd, GFP_KERNEL);
289 if (!regd)
290 return -ENOMEM;
291
292 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
293
294 for (i = 0; i < src_regd->n_reg_rules; i++)
295 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
296 sizeof(struct ieee80211_reg_rule));
297
298 *dst_regd = regd;
299 return 0;
300 }
301
302 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
303 struct reg_regdb_search_request {
304 char alpha2[2];
305 struct list_head list;
306 };
307
308 static LIST_HEAD(reg_regdb_search_list);
309 static DEFINE_MUTEX(reg_regdb_search_mutex);
310
311 static void reg_regdb_search(struct work_struct *work)
312 {
313 struct reg_regdb_search_request *request;
314 const struct ieee80211_regdomain *curdom, *regdom;
315 int i, r;
316
317 mutex_lock(&reg_regdb_search_mutex);
318 while (!list_empty(&reg_regdb_search_list)) {
319 request = list_first_entry(&reg_regdb_search_list,
320 struct reg_regdb_search_request,
321 list);
322 list_del(&request->list);
323
324 for (i=0; i<reg_regdb_size; i++) {
325 curdom = reg_regdb[i];
326
327 if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
328 r = reg_copy_regd(&regdom, curdom);
329 if (r)
330 break;
331 mutex_lock(&cfg80211_mutex);
332 set_regdom(regdom);
333 mutex_unlock(&cfg80211_mutex);
334 break;
335 }
336 }
337
338 kfree(request);
339 }
340 mutex_unlock(&reg_regdb_search_mutex);
341 }
342
343 static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
344
345 static void reg_regdb_query(const char *alpha2)
346 {
347 struct reg_regdb_search_request *request;
348
349 if (!alpha2)
350 return;
351
352 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
353 if (!request)
354 return;
355
356 memcpy(request->alpha2, alpha2, 2);
357
358 mutex_lock(&reg_regdb_search_mutex);
359 list_add_tail(&request->list, &reg_regdb_search_list);
360 mutex_unlock(&reg_regdb_search_mutex);
361
362 schedule_work(&reg_regdb_work);
363 }
364 #else
365 static inline void reg_regdb_query(const char *alpha2) {}
366 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
367
368 /*
369 * This lets us keep regulatory code which is updated on a regulatory
370 * basis in userspace. Country information is filled in by
371 * reg_device_uevent
372 */
373 static int call_crda(const char *alpha2)
374 {
375 if (!is_world_regdom((char *) alpha2))
376 pr_info("Calling CRDA for country: %c%c\n",
377 alpha2[0], alpha2[1]);
378 else
379 pr_info("Calling CRDA to update world regulatory domain\n");
380
381 /* query internal regulatory database (if it exists) */
382 reg_regdb_query(alpha2);
383
384 return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
385 }
386
387 /* Used by nl80211 before kmalloc'ing our regulatory domain */
388 bool reg_is_valid_request(const char *alpha2)
389 {
390 assert_cfg80211_lock();
391
392 if (!last_request)
393 return false;
394
395 return alpha2_equal(last_request->alpha2, alpha2);
396 }
397
398 /* Sanity check on a regulatory rule */
399 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
400 {
401 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
402 u32 freq_diff;
403
404 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
405 return false;
406
407 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
408 return false;
409
410 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
411
412 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
413 freq_range->max_bandwidth_khz > freq_diff)
414 return false;
415
416 return true;
417 }
418
419 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
420 {
421 const struct ieee80211_reg_rule *reg_rule = NULL;
422 unsigned int i;
423
424 if (!rd->n_reg_rules)
425 return false;
426
427 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
428 return false;
429
430 for (i = 0; i < rd->n_reg_rules; i++) {
431 reg_rule = &rd->reg_rules[i];
432 if (!is_valid_reg_rule(reg_rule))
433 return false;
434 }
435
436 return true;
437 }
438
439 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
440 u32 center_freq_khz,
441 u32 bw_khz)
442 {
443 u32 start_freq_khz, end_freq_khz;
444
445 start_freq_khz = center_freq_khz - (bw_khz/2);
446 end_freq_khz = center_freq_khz + (bw_khz/2);
447
448 if (start_freq_khz >= freq_range->start_freq_khz &&
449 end_freq_khz <= freq_range->end_freq_khz)
450 return true;
451
452 return false;
453 }
454
455 /**
456 * freq_in_rule_band - tells us if a frequency is in a frequency band
457 * @freq_range: frequency rule we want to query
458 * @freq_khz: frequency we are inquiring about
459 *
460 * This lets us know if a specific frequency rule is or is not relevant to
461 * a specific frequency's band. Bands are device specific and artificial
462 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
463 * safe for now to assume that a frequency rule should not be part of a
464 * frequency's band if the start freq or end freq are off by more than 2 GHz.
465 * This resolution can be lowered and should be considered as we add
466 * regulatory rule support for other "bands".
467 **/
468 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
469 u32 freq_khz)
470 {
471 #define ONE_GHZ_IN_KHZ 1000000
472 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
473 return true;
474 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
475 return true;
476 return false;
477 #undef ONE_GHZ_IN_KHZ
478 }
479
480 /*
481 * Helper for regdom_intersect(), this does the real
482 * mathematical intersection fun
483 */
484 static int reg_rules_intersect(
485 const struct ieee80211_reg_rule *rule1,
486 const struct ieee80211_reg_rule *rule2,
487 struct ieee80211_reg_rule *intersected_rule)
488 {
489 const struct ieee80211_freq_range *freq_range1, *freq_range2;
490 struct ieee80211_freq_range *freq_range;
491 const struct ieee80211_power_rule *power_rule1, *power_rule2;
492 struct ieee80211_power_rule *power_rule;
493 u32 freq_diff;
494
495 freq_range1 = &rule1->freq_range;
496 freq_range2 = &rule2->freq_range;
497 freq_range = &intersected_rule->freq_range;
498
499 power_rule1 = &rule1->power_rule;
500 power_rule2 = &rule2->power_rule;
501 power_rule = &intersected_rule->power_rule;
502
503 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
504 freq_range2->start_freq_khz);
505 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
506 freq_range2->end_freq_khz);
507 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
508 freq_range2->max_bandwidth_khz);
509
510 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
511 if (freq_range->max_bandwidth_khz > freq_diff)
512 freq_range->max_bandwidth_khz = freq_diff;
513
514 power_rule->max_eirp = min(power_rule1->max_eirp,
515 power_rule2->max_eirp);
516 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
517 power_rule2->max_antenna_gain);
518
519 intersected_rule->flags = (rule1->flags | rule2->flags);
520
521 if (!is_valid_reg_rule(intersected_rule))
522 return -EINVAL;
523
524 return 0;
525 }
526
527 /**
528 * regdom_intersect - do the intersection between two regulatory domains
529 * @rd1: first regulatory domain
530 * @rd2: second regulatory domain
531 *
532 * Use this function to get the intersection between two regulatory domains.
533 * Once completed we will mark the alpha2 for the rd as intersected, "98",
534 * as no one single alpha2 can represent this regulatory domain.
535 *
536 * Returns a pointer to the regulatory domain structure which will hold the
537 * resulting intersection of rules between rd1 and rd2. We will
538 * kzalloc() this structure for you.
539 */
540 static struct ieee80211_regdomain *regdom_intersect(
541 const struct ieee80211_regdomain *rd1,
542 const struct ieee80211_regdomain *rd2)
543 {
544 int r, size_of_regd;
545 unsigned int x, y;
546 unsigned int num_rules = 0, rule_idx = 0;
547 const struct ieee80211_reg_rule *rule1, *rule2;
548 struct ieee80211_reg_rule *intersected_rule;
549 struct ieee80211_regdomain *rd;
550 /* This is just a dummy holder to help us count */
551 struct ieee80211_reg_rule irule;
552
553 /* Uses the stack temporarily for counter arithmetic */
554 intersected_rule = &irule;
555
556 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
557
558 if (!rd1 || !rd2)
559 return NULL;
560
561 /*
562 * First we get a count of the rules we'll need, then we actually
563 * build them. This is to so we can malloc() and free() a
564 * regdomain once. The reason we use reg_rules_intersect() here
565 * is it will return -EINVAL if the rule computed makes no sense.
566 * All rules that do check out OK are valid.
567 */
568
569 for (x = 0; x < rd1->n_reg_rules; x++) {
570 rule1 = &rd1->reg_rules[x];
571 for (y = 0; y < rd2->n_reg_rules; y++) {
572 rule2 = &rd2->reg_rules[y];
573 if (!reg_rules_intersect(rule1, rule2,
574 intersected_rule))
575 num_rules++;
576 memset(intersected_rule, 0,
577 sizeof(struct ieee80211_reg_rule));
578 }
579 }
580
581 if (!num_rules)
582 return NULL;
583
584 size_of_regd = sizeof(struct ieee80211_regdomain) +
585 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
586
587 rd = kzalloc(size_of_regd, GFP_KERNEL);
588 if (!rd)
589 return NULL;
590
591 for (x = 0; x < rd1->n_reg_rules; x++) {
592 rule1 = &rd1->reg_rules[x];
593 for (y = 0; y < rd2->n_reg_rules; y++) {
594 rule2 = &rd2->reg_rules[y];
595 /*
596 * This time around instead of using the stack lets
597 * write to the target rule directly saving ourselves
598 * a memcpy()
599 */
600 intersected_rule = &rd->reg_rules[rule_idx];
601 r = reg_rules_intersect(rule1, rule2,
602 intersected_rule);
603 /*
604 * No need to memset here the intersected rule here as
605 * we're not using the stack anymore
606 */
607 if (r)
608 continue;
609 rule_idx++;
610 }
611 }
612
613 if (rule_idx != num_rules) {
614 kfree(rd);
615 return NULL;
616 }
617
618 rd->n_reg_rules = num_rules;
619 rd->alpha2[0] = '9';
620 rd->alpha2[1] = '8';
621
622 return rd;
623 }
624
625 /*
626 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
627 * want to just have the channel structure use these
628 */
629 static u32 map_regdom_flags(u32 rd_flags)
630 {
631 u32 channel_flags = 0;
632 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
633 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
634 if (rd_flags & NL80211_RRF_NO_IBSS)
635 channel_flags |= IEEE80211_CHAN_NO_IBSS;
636 if (rd_flags & NL80211_RRF_DFS)
637 channel_flags |= IEEE80211_CHAN_RADAR;
638 return channel_flags;
639 }
640
641 static int freq_reg_info_regd(struct wiphy *wiphy,
642 u32 center_freq,
643 u32 desired_bw_khz,
644 const struct ieee80211_reg_rule **reg_rule,
645 const struct ieee80211_regdomain *custom_regd)
646 {
647 int i;
648 bool band_rule_found = false;
649 const struct ieee80211_regdomain *regd;
650 bool bw_fits = false;
651
652 if (!desired_bw_khz)
653 desired_bw_khz = MHZ_TO_KHZ(20);
654
655 regd = custom_regd ? custom_regd : cfg80211_regdomain;
656
657 /*
658 * Follow the driver's regulatory domain, if present, unless a country
659 * IE has been processed or a user wants to help complaince further
660 */
661 if (!custom_regd &&
662 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
663 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
664 wiphy->regd)
665 regd = wiphy->regd;
666
667 if (!regd)
668 return -EINVAL;
669
670 for (i = 0; i < regd->n_reg_rules; i++) {
671 const struct ieee80211_reg_rule *rr;
672 const struct ieee80211_freq_range *fr = NULL;
673
674 rr = &regd->reg_rules[i];
675 fr = &rr->freq_range;
676
677 /*
678 * We only need to know if one frequency rule was
679 * was in center_freq's band, that's enough, so lets
680 * not overwrite it once found
681 */
682 if (!band_rule_found)
683 band_rule_found = freq_in_rule_band(fr, center_freq);
684
685 bw_fits = reg_does_bw_fit(fr,
686 center_freq,
687 desired_bw_khz);
688
689 if (band_rule_found && bw_fits) {
690 *reg_rule = rr;
691 return 0;
692 }
693 }
694
695 if (!band_rule_found)
696 return -ERANGE;
697
698 return -EINVAL;
699 }
700
701 int freq_reg_info(struct wiphy *wiphy,
702 u32 center_freq,
703 u32 desired_bw_khz,
704 const struct ieee80211_reg_rule **reg_rule)
705 {
706 assert_cfg80211_lock();
707 return freq_reg_info_regd(wiphy,
708 center_freq,
709 desired_bw_khz,
710 reg_rule,
711 NULL);
712 }
713 EXPORT_SYMBOL(freq_reg_info);
714
715 #ifdef CONFIG_CFG80211_REG_DEBUG
716 static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
717 {
718 switch (initiator) {
719 case NL80211_REGDOM_SET_BY_CORE:
720 return "Set by core";
721 case NL80211_REGDOM_SET_BY_USER:
722 return "Set by user";
723 case NL80211_REGDOM_SET_BY_DRIVER:
724 return "Set by driver";
725 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
726 return "Set by country IE";
727 default:
728 WARN_ON(1);
729 return "Set by bug";
730 }
731 }
732
733 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
734 u32 desired_bw_khz,
735 const struct ieee80211_reg_rule *reg_rule)
736 {
737 const struct ieee80211_power_rule *power_rule;
738 const struct ieee80211_freq_range *freq_range;
739 char max_antenna_gain[32];
740
741 power_rule = &reg_rule->power_rule;
742 freq_range = &reg_rule->freq_range;
743
744 if (!power_rule->max_antenna_gain)
745 snprintf(max_antenna_gain, 32, "N/A");
746 else
747 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
748
749 REG_DBG_PRINT("Updating information on frequency %d MHz "
750 "for a %d MHz width channel with regulatory rule:\n",
751 chan->center_freq,
752 KHZ_TO_MHZ(desired_bw_khz));
753
754 REG_DBG_PRINT("%d KHz - %d KHz @ KHz), (%s mBi, %d mBm)\n",
755 freq_range->start_freq_khz,
756 freq_range->end_freq_khz,
757 max_antenna_gain,
758 power_rule->max_eirp);
759 }
760 #else
761 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
762 u32 desired_bw_khz,
763 const struct ieee80211_reg_rule *reg_rule)
764 {
765 return;
766 }
767 #endif
768
769 /*
770 * Note that right now we assume the desired channel bandwidth
771 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
772 * per channel, the primary and the extension channel). To support
773 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
774 * new ieee80211_channel.target_bw and re run the regulatory check
775 * on the wiphy with the target_bw specified. Then we can simply use
776 * that below for the desired_bw_khz below.
777 */
778 static void handle_channel(struct wiphy *wiphy,
779 enum nl80211_reg_initiator initiator,
780 enum ieee80211_band band,
781 unsigned int chan_idx)
782 {
783 int r;
784 u32 flags, bw_flags = 0;
785 u32 desired_bw_khz = MHZ_TO_KHZ(20);
786 const struct ieee80211_reg_rule *reg_rule = NULL;
787 const struct ieee80211_power_rule *power_rule = NULL;
788 const struct ieee80211_freq_range *freq_range = NULL;
789 struct ieee80211_supported_band *sband;
790 struct ieee80211_channel *chan;
791 struct wiphy *request_wiphy = NULL;
792
793 assert_cfg80211_lock();
794
795 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
796
797 sband = wiphy->bands[band];
798 BUG_ON(chan_idx >= sband->n_channels);
799 chan = &sband->channels[chan_idx];
800
801 flags = chan->orig_flags;
802
803 r = freq_reg_info(wiphy,
804 MHZ_TO_KHZ(chan->center_freq),
805 desired_bw_khz,
806 &reg_rule);
807
808 if (r) {
809 /*
810 * We will disable all channels that do not match our
811 * received regulatory rule unless the hint is coming
812 * from a Country IE and the Country IE had no information
813 * about a band. The IEEE 802.11 spec allows for an AP
814 * to send only a subset of the regulatory rules allowed,
815 * so an AP in the US that only supports 2.4 GHz may only send
816 * a country IE with information for the 2.4 GHz band
817 * while 5 GHz is still supported.
818 */
819 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
820 r == -ERANGE)
821 return;
822
823 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
824 chan->flags = IEEE80211_CHAN_DISABLED;
825 return;
826 }
827
828 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
829
830 power_rule = &reg_rule->power_rule;
831 freq_range = &reg_rule->freq_range;
832
833 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
834 bw_flags = IEEE80211_CHAN_NO_HT40;
835
836 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
837 request_wiphy && request_wiphy == wiphy &&
838 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
839 /*
840 * This guarantees the driver's requested regulatory domain
841 * will always be used as a base for further regulatory
842 * settings
843 */
844 chan->flags = chan->orig_flags =
845 map_regdom_flags(reg_rule->flags) | bw_flags;
846 chan->max_antenna_gain = chan->orig_mag =
847 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
848 chan->max_power = chan->orig_mpwr =
849 (int) MBM_TO_DBM(power_rule->max_eirp);
850 return;
851 }
852
853 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
854 chan->max_antenna_gain = min(chan->orig_mag,
855 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
856 if (chan->orig_mpwr)
857 chan->max_power = min(chan->orig_mpwr,
858 (int) MBM_TO_DBM(power_rule->max_eirp));
859 else
860 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
861 }
862
863 static void handle_band(struct wiphy *wiphy,
864 enum ieee80211_band band,
865 enum nl80211_reg_initiator initiator)
866 {
867 unsigned int i;
868 struct ieee80211_supported_band *sband;
869
870 BUG_ON(!wiphy->bands[band]);
871 sband = wiphy->bands[band];
872
873 for (i = 0; i < sband->n_channels; i++)
874 handle_channel(wiphy, initiator, band, i);
875 }
876
877 static bool ignore_reg_update(struct wiphy *wiphy,
878 enum nl80211_reg_initiator initiator)
879 {
880 if (!last_request) {
881 REG_DBG_PRINT("Ignoring regulatory request %s since "
882 "last_request is not set\n",
883 reg_initiator_name(initiator));
884 return true;
885 }
886
887 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
888 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
889 REG_DBG_PRINT("Ignoring regulatory request %s "
890 "since the driver uses its own custom "
891 "regulatory domain\n",
892 reg_initiator_name(initiator));
893 return true;
894 }
895
896 /*
897 * wiphy->regd will be set once the device has its own
898 * desired regulatory domain set
899 */
900 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
901 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
902 !is_world_regdom(last_request->alpha2)) {
903 REG_DBG_PRINT("Ignoring regulatory request %s "
904 "since the driver requires its own regulatory "
905 "domain to be set first\n",
906 reg_initiator_name(initiator));
907 return true;
908 }
909
910 return false;
911 }
912
913 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
914 {
915 struct cfg80211_registered_device *rdev;
916
917 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
918 wiphy_update_regulatory(&rdev->wiphy, initiator);
919 }
920
921 static void handle_reg_beacon(struct wiphy *wiphy,
922 unsigned int chan_idx,
923 struct reg_beacon *reg_beacon)
924 {
925 struct ieee80211_supported_band *sband;
926 struct ieee80211_channel *chan;
927 bool channel_changed = false;
928 struct ieee80211_channel chan_before;
929
930 assert_cfg80211_lock();
931
932 sband = wiphy->bands[reg_beacon->chan.band];
933 chan = &sband->channels[chan_idx];
934
935 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
936 return;
937
938 if (chan->beacon_found)
939 return;
940
941 chan->beacon_found = true;
942
943 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
944 return;
945
946 chan_before.center_freq = chan->center_freq;
947 chan_before.flags = chan->flags;
948
949 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
950 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
951 channel_changed = true;
952 }
953
954 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
955 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
956 channel_changed = true;
957 }
958
959 if (channel_changed)
960 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
961 }
962
963 /*
964 * Called when a scan on a wiphy finds a beacon on
965 * new channel
966 */
967 static void wiphy_update_new_beacon(struct wiphy *wiphy,
968 struct reg_beacon *reg_beacon)
969 {
970 unsigned int i;
971 struct ieee80211_supported_band *sband;
972
973 assert_cfg80211_lock();
974
975 if (!wiphy->bands[reg_beacon->chan.band])
976 return;
977
978 sband = wiphy->bands[reg_beacon->chan.band];
979
980 for (i = 0; i < sband->n_channels; i++)
981 handle_reg_beacon(wiphy, i, reg_beacon);
982 }
983
984 /*
985 * Called upon reg changes or a new wiphy is added
986 */
987 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
988 {
989 unsigned int i;
990 struct ieee80211_supported_band *sband;
991 struct reg_beacon *reg_beacon;
992
993 assert_cfg80211_lock();
994
995 if (list_empty(&reg_beacon_list))
996 return;
997
998 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
999 if (!wiphy->bands[reg_beacon->chan.band])
1000 continue;
1001 sband = wiphy->bands[reg_beacon->chan.band];
1002 for (i = 0; i < sband->n_channels; i++)
1003 handle_reg_beacon(wiphy, i, reg_beacon);
1004 }
1005 }
1006
1007 static bool reg_is_world_roaming(struct wiphy *wiphy)
1008 {
1009 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1010 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1011 return true;
1012 if (last_request &&
1013 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1014 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1015 return true;
1016 return false;
1017 }
1018
1019 /* Reap the advantages of previously found beacons */
1020 static void reg_process_beacons(struct wiphy *wiphy)
1021 {
1022 /*
1023 * Means we are just firing up cfg80211, so no beacons would
1024 * have been processed yet.
1025 */
1026 if (!last_request)
1027 return;
1028 if (!reg_is_world_roaming(wiphy))
1029 return;
1030 wiphy_update_beacon_reg(wiphy);
1031 }
1032
1033 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1034 {
1035 if (!chan)
1036 return true;
1037 if (chan->flags & IEEE80211_CHAN_DISABLED)
1038 return true;
1039 /* This would happen when regulatory rules disallow HT40 completely */
1040 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1041 return true;
1042 return false;
1043 }
1044
1045 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1046 enum ieee80211_band band,
1047 unsigned int chan_idx)
1048 {
1049 struct ieee80211_supported_band *sband;
1050 struct ieee80211_channel *channel;
1051 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1052 unsigned int i;
1053
1054 assert_cfg80211_lock();
1055
1056 sband = wiphy->bands[band];
1057 BUG_ON(chan_idx >= sband->n_channels);
1058 channel = &sband->channels[chan_idx];
1059
1060 if (is_ht40_not_allowed(channel)) {
1061 channel->flags |= IEEE80211_CHAN_NO_HT40;
1062 return;
1063 }
1064
1065 /*
1066 * We need to ensure the extension channels exist to
1067 * be able to use HT40- or HT40+, this finds them (or not)
1068 */
1069 for (i = 0; i < sband->n_channels; i++) {
1070 struct ieee80211_channel *c = &sband->channels[i];
1071 if (c->center_freq == (channel->center_freq - 20))
1072 channel_before = c;
1073 if (c->center_freq == (channel->center_freq + 20))
1074 channel_after = c;
1075 }
1076
1077 /*
1078 * Please note that this assumes target bandwidth is 20 MHz,
1079 * if that ever changes we also need to change the below logic
1080 * to include that as well.
1081 */
1082 if (is_ht40_not_allowed(channel_before))
1083 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1084 else
1085 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1086
1087 if (is_ht40_not_allowed(channel_after))
1088 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1089 else
1090 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1091 }
1092
1093 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1094 enum ieee80211_band band)
1095 {
1096 unsigned int i;
1097 struct ieee80211_supported_band *sband;
1098
1099 BUG_ON(!wiphy->bands[band]);
1100 sband = wiphy->bands[band];
1101
1102 for (i = 0; i < sband->n_channels; i++)
1103 reg_process_ht_flags_channel(wiphy, band, i);
1104 }
1105
1106 static void reg_process_ht_flags(struct wiphy *wiphy)
1107 {
1108 enum ieee80211_band band;
1109
1110 if (!wiphy)
1111 return;
1112
1113 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1114 if (wiphy->bands[band])
1115 reg_process_ht_flags_band(wiphy, band);
1116 }
1117
1118 }
1119
1120 void wiphy_update_regulatory(struct wiphy *wiphy,
1121 enum nl80211_reg_initiator initiator)
1122 {
1123 enum ieee80211_band band;
1124
1125 if (ignore_reg_update(wiphy, initiator))
1126 return;
1127
1128 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1129 if (wiphy->bands[band])
1130 handle_band(wiphy, band, initiator);
1131 }
1132
1133 reg_process_beacons(wiphy);
1134 reg_process_ht_flags(wiphy);
1135 if (wiphy->reg_notifier)
1136 wiphy->reg_notifier(wiphy, last_request);
1137 }
1138
1139 static void handle_channel_custom(struct wiphy *wiphy,
1140 enum ieee80211_band band,
1141 unsigned int chan_idx,
1142 const struct ieee80211_regdomain *regd)
1143 {
1144 int r;
1145 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1146 u32 bw_flags = 0;
1147 const struct ieee80211_reg_rule *reg_rule = NULL;
1148 const struct ieee80211_power_rule *power_rule = NULL;
1149 const struct ieee80211_freq_range *freq_range = NULL;
1150 struct ieee80211_supported_band *sband;
1151 struct ieee80211_channel *chan;
1152
1153 assert_reg_lock();
1154
1155 sband = wiphy->bands[band];
1156 BUG_ON(chan_idx >= sband->n_channels);
1157 chan = &sband->channels[chan_idx];
1158
1159 r = freq_reg_info_regd(wiphy,
1160 MHZ_TO_KHZ(chan->center_freq),
1161 desired_bw_khz,
1162 &reg_rule,
1163 regd);
1164
1165 if (r) {
1166 REG_DBG_PRINT("Disabling freq %d MHz as custom "
1167 "regd has no rule that fits a %d MHz "
1168 "wide channel\n",
1169 chan->center_freq,
1170 KHZ_TO_MHZ(desired_bw_khz));
1171 chan->flags = IEEE80211_CHAN_DISABLED;
1172 return;
1173 }
1174
1175 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1176
1177 power_rule = &reg_rule->power_rule;
1178 freq_range = &reg_rule->freq_range;
1179
1180 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1181 bw_flags = IEEE80211_CHAN_NO_HT40;
1182
1183 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1184 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1185 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1186 }
1187
1188 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1189 const struct ieee80211_regdomain *regd)
1190 {
1191 unsigned int i;
1192 struct ieee80211_supported_band *sband;
1193
1194 BUG_ON(!wiphy->bands[band]);
1195 sband = wiphy->bands[band];
1196
1197 for (i = 0; i < sband->n_channels; i++)
1198 handle_channel_custom(wiphy, band, i, regd);
1199 }
1200
1201 /* Used by drivers prior to wiphy registration */
1202 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1203 const struct ieee80211_regdomain *regd)
1204 {
1205 enum ieee80211_band band;
1206 unsigned int bands_set = 0;
1207
1208 mutex_lock(&reg_mutex);
1209 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1210 if (!wiphy->bands[band])
1211 continue;
1212 handle_band_custom(wiphy, band, regd);
1213 bands_set++;
1214 }
1215 mutex_unlock(&reg_mutex);
1216
1217 /*
1218 * no point in calling this if it won't have any effect
1219 * on your device's supportd bands.
1220 */
1221 WARN_ON(!bands_set);
1222 }
1223 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1224
1225 /*
1226 * Return value which can be used by ignore_request() to indicate
1227 * it has been determined we should intersect two regulatory domains
1228 */
1229 #define REG_INTERSECT 1
1230
1231 /* This has the logic which determines when a new request
1232 * should be ignored. */
1233 static int ignore_request(struct wiphy *wiphy,
1234 struct regulatory_request *pending_request)
1235 {
1236 struct wiphy *last_wiphy = NULL;
1237
1238 assert_cfg80211_lock();
1239
1240 /* All initial requests are respected */
1241 if (!last_request)
1242 return 0;
1243
1244 switch (pending_request->initiator) {
1245 case NL80211_REGDOM_SET_BY_CORE:
1246 return 0;
1247 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1248
1249 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1250
1251 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1252 return -EINVAL;
1253 if (last_request->initiator ==
1254 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1255 if (last_wiphy != wiphy) {
1256 /*
1257 * Two cards with two APs claiming different
1258 * Country IE alpha2s. We could
1259 * intersect them, but that seems unlikely
1260 * to be correct. Reject second one for now.
1261 */
1262 if (regdom_changes(pending_request->alpha2))
1263 return -EOPNOTSUPP;
1264 return -EALREADY;
1265 }
1266 /*
1267 * Two consecutive Country IE hints on the same wiphy.
1268 * This should be picked up early by the driver/stack
1269 */
1270 if (WARN_ON(regdom_changes(pending_request->alpha2)))
1271 return 0;
1272 return -EALREADY;
1273 }
1274 return 0;
1275 case NL80211_REGDOM_SET_BY_DRIVER:
1276 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1277 if (regdom_changes(pending_request->alpha2))
1278 return 0;
1279 return -EALREADY;
1280 }
1281
1282 /*
1283 * This would happen if you unplug and plug your card
1284 * back in or if you add a new device for which the previously
1285 * loaded card also agrees on the regulatory domain.
1286 */
1287 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1288 !regdom_changes(pending_request->alpha2))
1289 return -EALREADY;
1290
1291 return REG_INTERSECT;
1292 case NL80211_REGDOM_SET_BY_USER:
1293 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1294 return REG_INTERSECT;
1295 /*
1296 * If the user knows better the user should set the regdom
1297 * to their country before the IE is picked up
1298 */
1299 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1300 last_request->intersect)
1301 return -EOPNOTSUPP;
1302 /*
1303 * Process user requests only after previous user/driver/core
1304 * requests have been processed
1305 */
1306 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1307 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1308 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1309 if (regdom_changes(last_request->alpha2))
1310 return -EAGAIN;
1311 }
1312
1313 if (!regdom_changes(pending_request->alpha2))
1314 return -EALREADY;
1315
1316 return 0;
1317 }
1318
1319 return -EINVAL;
1320 }
1321
1322 static void reg_set_request_processed(void)
1323 {
1324 bool need_more_processing = false;
1325
1326 last_request->processed = true;
1327
1328 spin_lock(&reg_requests_lock);
1329 if (!list_empty(&reg_requests_list))
1330 need_more_processing = true;
1331 spin_unlock(&reg_requests_lock);
1332
1333 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
1334 cancel_delayed_work_sync(&reg_timeout);
1335
1336 if (need_more_processing)
1337 schedule_work(&reg_work);
1338 }
1339
1340 /**
1341 * __regulatory_hint - hint to the wireless core a regulatory domain
1342 * @wiphy: if the hint comes from country information from an AP, this
1343 * is required to be set to the wiphy that received the information
1344 * @pending_request: the regulatory request currently being processed
1345 *
1346 * The Wireless subsystem can use this function to hint to the wireless core
1347 * what it believes should be the current regulatory domain.
1348 *
1349 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1350 * already been set or other standard error codes.
1351 *
1352 * Caller must hold &cfg80211_mutex and &reg_mutex
1353 */
1354 static int __regulatory_hint(struct wiphy *wiphy,
1355 struct regulatory_request *pending_request)
1356 {
1357 bool intersect = false;
1358 int r = 0;
1359
1360 assert_cfg80211_lock();
1361
1362 r = ignore_request(wiphy, pending_request);
1363
1364 if (r == REG_INTERSECT) {
1365 if (pending_request->initiator ==
1366 NL80211_REGDOM_SET_BY_DRIVER) {
1367 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1368 if (r) {
1369 kfree(pending_request);
1370 return r;
1371 }
1372 }
1373 intersect = true;
1374 } else if (r) {
1375 /*
1376 * If the regulatory domain being requested by the
1377 * driver has already been set just copy it to the
1378 * wiphy
1379 */
1380 if (r == -EALREADY &&
1381 pending_request->initiator ==
1382 NL80211_REGDOM_SET_BY_DRIVER) {
1383 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1384 if (r) {
1385 kfree(pending_request);
1386 return r;
1387 }
1388 r = -EALREADY;
1389 goto new_request;
1390 }
1391 kfree(pending_request);
1392 return r;
1393 }
1394
1395 new_request:
1396 kfree(last_request);
1397
1398 last_request = pending_request;
1399 last_request->intersect = intersect;
1400
1401 pending_request = NULL;
1402
1403 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1404 user_alpha2[0] = last_request->alpha2[0];
1405 user_alpha2[1] = last_request->alpha2[1];
1406 }
1407
1408 /* When r == REG_INTERSECT we do need to call CRDA */
1409 if (r < 0) {
1410 /*
1411 * Since CRDA will not be called in this case as we already
1412 * have applied the requested regulatory domain before we just
1413 * inform userspace we have processed the request
1414 */
1415 if (r == -EALREADY) {
1416 nl80211_send_reg_change_event(last_request);
1417 reg_set_request_processed();
1418 }
1419 return r;
1420 }
1421
1422 return call_crda(last_request->alpha2);
1423 }
1424
1425 /* This processes *all* regulatory hints */
1426 static void reg_process_hint(struct regulatory_request *reg_request)
1427 {
1428 int r = 0;
1429 struct wiphy *wiphy = NULL;
1430 enum nl80211_reg_initiator initiator = reg_request->initiator;
1431
1432 BUG_ON(!reg_request->alpha2);
1433
1434 if (wiphy_idx_valid(reg_request->wiphy_idx))
1435 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1436
1437 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1438 !wiphy) {
1439 kfree(reg_request);
1440 return;
1441 }
1442
1443 r = __regulatory_hint(wiphy, reg_request);
1444 /* This is required so that the orig_* parameters are saved */
1445 if (r == -EALREADY && wiphy &&
1446 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
1447 wiphy_update_regulatory(wiphy, initiator);
1448 return;
1449 }
1450
1451 /*
1452 * We only time out user hints, given that they should be the only
1453 * source of bogus requests.
1454 */
1455 if (r != -EALREADY &&
1456 reg_request->initiator == NL80211_REGDOM_SET_BY_USER)
1457 schedule_delayed_work(&reg_timeout, msecs_to_jiffies(3142));
1458 }
1459
1460 /*
1461 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1462 * Regulatory hints come on a first come first serve basis and we
1463 * must process each one atomically.
1464 */
1465 static void reg_process_pending_hints(void)
1466 {
1467 struct regulatory_request *reg_request;
1468
1469 mutex_lock(&cfg80211_mutex);
1470 mutex_lock(&reg_mutex);
1471
1472 /* When last_request->processed becomes true this will be rescheduled */
1473 if (last_request && !last_request->processed) {
1474 REG_DBG_PRINT("Pending regulatory request, waiting "
1475 "for it to be processed...\n");
1476 goto out;
1477 }
1478
1479 spin_lock(&reg_requests_lock);
1480
1481 if (list_empty(&reg_requests_list)) {
1482 spin_unlock(&reg_requests_lock);
1483 goto out;
1484 }
1485
1486 reg_request = list_first_entry(&reg_requests_list,
1487 struct regulatory_request,
1488 list);
1489 list_del_init(&reg_request->list);
1490
1491 spin_unlock(&reg_requests_lock);
1492
1493 reg_process_hint(reg_request);
1494
1495 out:
1496 mutex_unlock(&reg_mutex);
1497 mutex_unlock(&cfg80211_mutex);
1498 }
1499
1500 /* Processes beacon hints -- this has nothing to do with country IEs */
1501 static void reg_process_pending_beacon_hints(void)
1502 {
1503 struct cfg80211_registered_device *rdev;
1504 struct reg_beacon *pending_beacon, *tmp;
1505
1506 /*
1507 * No need to hold the reg_mutex here as we just touch wiphys
1508 * and do not read or access regulatory variables.
1509 */
1510 mutex_lock(&cfg80211_mutex);
1511
1512 /* This goes through the _pending_ beacon list */
1513 spin_lock_bh(&reg_pending_beacons_lock);
1514
1515 if (list_empty(&reg_pending_beacons)) {
1516 spin_unlock_bh(&reg_pending_beacons_lock);
1517 goto out;
1518 }
1519
1520 list_for_each_entry_safe(pending_beacon, tmp,
1521 &reg_pending_beacons, list) {
1522
1523 list_del_init(&pending_beacon->list);
1524
1525 /* Applies the beacon hint to current wiphys */
1526 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1527 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1528
1529 /* Remembers the beacon hint for new wiphys or reg changes */
1530 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1531 }
1532
1533 spin_unlock_bh(&reg_pending_beacons_lock);
1534 out:
1535 mutex_unlock(&cfg80211_mutex);
1536 }
1537
1538 static void reg_todo(struct work_struct *work)
1539 {
1540 reg_process_pending_hints();
1541 reg_process_pending_beacon_hints();
1542 }
1543
1544 static void queue_regulatory_request(struct regulatory_request *request)
1545 {
1546 if (isalpha(request->alpha2[0]))
1547 request->alpha2[0] = toupper(request->alpha2[0]);
1548 if (isalpha(request->alpha2[1]))
1549 request->alpha2[1] = toupper(request->alpha2[1]);
1550
1551 spin_lock(&reg_requests_lock);
1552 list_add_tail(&request->list, &reg_requests_list);
1553 spin_unlock(&reg_requests_lock);
1554
1555 schedule_work(&reg_work);
1556 }
1557
1558 /*
1559 * Core regulatory hint -- happens during cfg80211_init()
1560 * and when we restore regulatory settings.
1561 */
1562 static int regulatory_hint_core(const char *alpha2)
1563 {
1564 struct regulatory_request *request;
1565
1566 kfree(last_request);
1567 last_request = NULL;
1568
1569 request = kzalloc(sizeof(struct regulatory_request),
1570 GFP_KERNEL);
1571 if (!request)
1572 return -ENOMEM;
1573
1574 request->alpha2[0] = alpha2[0];
1575 request->alpha2[1] = alpha2[1];
1576 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1577
1578 queue_regulatory_request(request);
1579
1580 return 0;
1581 }
1582
1583 /* User hints */
1584 int regulatory_hint_user(const char *alpha2)
1585 {
1586 struct regulatory_request *request;
1587
1588 BUG_ON(!alpha2);
1589
1590 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1591 if (!request)
1592 return -ENOMEM;
1593
1594 request->wiphy_idx = WIPHY_IDX_STALE;
1595 request->alpha2[0] = alpha2[0];
1596 request->alpha2[1] = alpha2[1];
1597 request->initiator = NL80211_REGDOM_SET_BY_USER;
1598
1599 queue_regulatory_request(request);
1600
1601 return 0;
1602 }
1603
1604 /* Driver hints */
1605 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1606 {
1607 struct regulatory_request *request;
1608
1609 BUG_ON(!alpha2);
1610 BUG_ON(!wiphy);
1611
1612 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1613 if (!request)
1614 return -ENOMEM;
1615
1616 request->wiphy_idx = get_wiphy_idx(wiphy);
1617
1618 /* Must have registered wiphy first */
1619 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1620
1621 request->alpha2[0] = alpha2[0];
1622 request->alpha2[1] = alpha2[1];
1623 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1624
1625 queue_regulatory_request(request);
1626
1627 return 0;
1628 }
1629 EXPORT_SYMBOL(regulatory_hint);
1630
1631 /*
1632 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1633 * therefore cannot iterate over the rdev list here.
1634 */
1635 void regulatory_hint_11d(struct wiphy *wiphy,
1636 enum ieee80211_band band,
1637 u8 *country_ie,
1638 u8 country_ie_len)
1639 {
1640 char alpha2[2];
1641 enum environment_cap env = ENVIRON_ANY;
1642 struct regulatory_request *request;
1643
1644 mutex_lock(&reg_mutex);
1645
1646 if (unlikely(!last_request))
1647 goto out;
1648
1649 /* IE len must be evenly divisible by 2 */
1650 if (country_ie_len & 0x01)
1651 goto out;
1652
1653 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1654 goto out;
1655
1656 alpha2[0] = country_ie[0];
1657 alpha2[1] = country_ie[1];
1658
1659 if (country_ie[2] == 'I')
1660 env = ENVIRON_INDOOR;
1661 else if (country_ie[2] == 'O')
1662 env = ENVIRON_OUTDOOR;
1663
1664 /*
1665 * We will run this only upon a successful connection on cfg80211.
1666 * We leave conflict resolution to the workqueue, where can hold
1667 * cfg80211_mutex.
1668 */
1669 if (likely(last_request->initiator ==
1670 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1671 wiphy_idx_valid(last_request->wiphy_idx)))
1672 goto out;
1673
1674 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1675 if (!request)
1676 goto out;
1677
1678 request->wiphy_idx = get_wiphy_idx(wiphy);
1679 request->alpha2[0] = alpha2[0];
1680 request->alpha2[1] = alpha2[1];
1681 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1682 request->country_ie_env = env;
1683
1684 mutex_unlock(&reg_mutex);
1685
1686 queue_regulatory_request(request);
1687
1688 return;
1689
1690 out:
1691 mutex_unlock(&reg_mutex);
1692 }
1693
1694 static void restore_alpha2(char *alpha2, bool reset_user)
1695 {
1696 /* indicates there is no alpha2 to consider for restoration */
1697 alpha2[0] = '9';
1698 alpha2[1] = '7';
1699
1700 /* The user setting has precedence over the module parameter */
1701 if (is_user_regdom_saved()) {
1702 /* Unless we're asked to ignore it and reset it */
1703 if (reset_user) {
1704 REG_DBG_PRINT("Restoring regulatory settings "
1705 "including user preference\n");
1706 user_alpha2[0] = '9';
1707 user_alpha2[1] = '7';
1708
1709 /*
1710 * If we're ignoring user settings, we still need to
1711 * check the module parameter to ensure we put things
1712 * back as they were for a full restore.
1713 */
1714 if (!is_world_regdom(ieee80211_regdom)) {
1715 REG_DBG_PRINT("Keeping preference on "
1716 "module parameter ieee80211_regdom: %c%c\n",
1717 ieee80211_regdom[0],
1718 ieee80211_regdom[1]);
1719 alpha2[0] = ieee80211_regdom[0];
1720 alpha2[1] = ieee80211_regdom[1];
1721 }
1722 } else {
1723 REG_DBG_PRINT("Restoring regulatory settings "
1724 "while preserving user preference for: %c%c\n",
1725 user_alpha2[0],
1726 user_alpha2[1]);
1727 alpha2[0] = user_alpha2[0];
1728 alpha2[1] = user_alpha2[1];
1729 }
1730 } else if (!is_world_regdom(ieee80211_regdom)) {
1731 REG_DBG_PRINT("Keeping preference on "
1732 "module parameter ieee80211_regdom: %c%c\n",
1733 ieee80211_regdom[0],
1734 ieee80211_regdom[1]);
1735 alpha2[0] = ieee80211_regdom[0];
1736 alpha2[1] = ieee80211_regdom[1];
1737 } else
1738 REG_DBG_PRINT("Restoring regulatory settings\n");
1739 }
1740
1741 /*
1742 * Restoring regulatory settings involves ingoring any
1743 * possibly stale country IE information and user regulatory
1744 * settings if so desired, this includes any beacon hints
1745 * learned as we could have traveled outside to another country
1746 * after disconnection. To restore regulatory settings we do
1747 * exactly what we did at bootup:
1748 *
1749 * - send a core regulatory hint
1750 * - send a user regulatory hint if applicable
1751 *
1752 * Device drivers that send a regulatory hint for a specific country
1753 * keep their own regulatory domain on wiphy->regd so that does does
1754 * not need to be remembered.
1755 */
1756 static void restore_regulatory_settings(bool reset_user)
1757 {
1758 char alpha2[2];
1759 struct reg_beacon *reg_beacon, *btmp;
1760 struct regulatory_request *reg_request, *tmp;
1761 LIST_HEAD(tmp_reg_req_list);
1762
1763 mutex_lock(&cfg80211_mutex);
1764 mutex_lock(&reg_mutex);
1765
1766 reset_regdomains();
1767 restore_alpha2(alpha2, reset_user);
1768
1769 /*
1770 * If there's any pending requests we simply
1771 * stash them to a temporary pending queue and
1772 * add then after we've restored regulatory
1773 * settings.
1774 */
1775 spin_lock(&reg_requests_lock);
1776 if (!list_empty(&reg_requests_list)) {
1777 list_for_each_entry_safe(reg_request, tmp,
1778 &reg_requests_list, list) {
1779 if (reg_request->initiator !=
1780 NL80211_REGDOM_SET_BY_USER)
1781 continue;
1782 list_del(&reg_request->list);
1783 list_add_tail(&reg_request->list, &tmp_reg_req_list);
1784 }
1785 }
1786 spin_unlock(&reg_requests_lock);
1787
1788 /* Clear beacon hints */
1789 spin_lock_bh(&reg_pending_beacons_lock);
1790 if (!list_empty(&reg_pending_beacons)) {
1791 list_for_each_entry_safe(reg_beacon, btmp,
1792 &reg_pending_beacons, list) {
1793 list_del(&reg_beacon->list);
1794 kfree(reg_beacon);
1795 }
1796 }
1797 spin_unlock_bh(&reg_pending_beacons_lock);
1798
1799 if (!list_empty(&reg_beacon_list)) {
1800 list_for_each_entry_safe(reg_beacon, btmp,
1801 &reg_beacon_list, list) {
1802 list_del(&reg_beacon->list);
1803 kfree(reg_beacon);
1804 }
1805 }
1806
1807 /* First restore to the basic regulatory settings */
1808 cfg80211_regdomain = cfg80211_world_regdom;
1809
1810 mutex_unlock(&reg_mutex);
1811 mutex_unlock(&cfg80211_mutex);
1812
1813 regulatory_hint_core(cfg80211_regdomain->alpha2);
1814
1815 /*
1816 * This restores the ieee80211_regdom module parameter
1817 * preference or the last user requested regulatory
1818 * settings, user regulatory settings takes precedence.
1819 */
1820 if (is_an_alpha2(alpha2))
1821 regulatory_hint_user(user_alpha2);
1822
1823 if (list_empty(&tmp_reg_req_list))
1824 return;
1825
1826 mutex_lock(&cfg80211_mutex);
1827 mutex_lock(&reg_mutex);
1828
1829 spin_lock(&reg_requests_lock);
1830 list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) {
1831 REG_DBG_PRINT("Adding request for country %c%c back "
1832 "into the queue\n",
1833 reg_request->alpha2[0],
1834 reg_request->alpha2[1]);
1835 list_del(&reg_request->list);
1836 list_add_tail(&reg_request->list, &reg_requests_list);
1837 }
1838 spin_unlock(&reg_requests_lock);
1839
1840 mutex_unlock(&reg_mutex);
1841 mutex_unlock(&cfg80211_mutex);
1842
1843 REG_DBG_PRINT("Kicking the queue\n");
1844
1845 schedule_work(&reg_work);
1846 }
1847
1848 void regulatory_hint_disconnect(void)
1849 {
1850 REG_DBG_PRINT("All devices are disconnected, going to "
1851 "restore regulatory settings\n");
1852 restore_regulatory_settings(false);
1853 }
1854
1855 static bool freq_is_chan_12_13_14(u16 freq)
1856 {
1857 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
1858 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
1859 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
1860 return true;
1861 return false;
1862 }
1863
1864 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1865 struct ieee80211_channel *beacon_chan,
1866 gfp_t gfp)
1867 {
1868 struct reg_beacon *reg_beacon;
1869
1870 if (likely((beacon_chan->beacon_found ||
1871 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1872 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1873 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1874 return 0;
1875
1876 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1877 if (!reg_beacon)
1878 return -ENOMEM;
1879
1880 REG_DBG_PRINT("Found new beacon on "
1881 "frequency: %d MHz (Ch %d) on %s\n",
1882 beacon_chan->center_freq,
1883 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1884 wiphy_name(wiphy));
1885
1886 memcpy(&reg_beacon->chan, beacon_chan,
1887 sizeof(struct ieee80211_channel));
1888
1889
1890 /*
1891 * Since we can be called from BH or and non-BH context
1892 * we must use spin_lock_bh()
1893 */
1894 spin_lock_bh(&reg_pending_beacons_lock);
1895 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1896 spin_unlock_bh(&reg_pending_beacons_lock);
1897
1898 schedule_work(&reg_work);
1899
1900 return 0;
1901 }
1902
1903 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1904 {
1905 unsigned int i;
1906 const struct ieee80211_reg_rule *reg_rule = NULL;
1907 const struct ieee80211_freq_range *freq_range = NULL;
1908 const struct ieee80211_power_rule *power_rule = NULL;
1909
1910 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
1911
1912 for (i = 0; i < rd->n_reg_rules; i++) {
1913 reg_rule = &rd->reg_rules[i];
1914 freq_range = &reg_rule->freq_range;
1915 power_rule = &reg_rule->power_rule;
1916
1917 /*
1918 * There may not be documentation for max antenna gain
1919 * in certain regions
1920 */
1921 if (power_rule->max_antenna_gain)
1922 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
1923 freq_range->start_freq_khz,
1924 freq_range->end_freq_khz,
1925 freq_range->max_bandwidth_khz,
1926 power_rule->max_antenna_gain,
1927 power_rule->max_eirp);
1928 else
1929 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
1930 freq_range->start_freq_khz,
1931 freq_range->end_freq_khz,
1932 freq_range->max_bandwidth_khz,
1933 power_rule->max_eirp);
1934 }
1935 }
1936
1937 static void print_regdomain(const struct ieee80211_regdomain *rd)
1938 {
1939
1940 if (is_intersected_alpha2(rd->alpha2)) {
1941
1942 if (last_request->initiator ==
1943 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1944 struct cfg80211_registered_device *rdev;
1945 rdev = cfg80211_rdev_by_wiphy_idx(
1946 last_request->wiphy_idx);
1947 if (rdev) {
1948 pr_info("Current regulatory domain updated by AP to: %c%c\n",
1949 rdev->country_ie_alpha2[0],
1950 rdev->country_ie_alpha2[1]);
1951 } else
1952 pr_info("Current regulatory domain intersected:\n");
1953 } else
1954 pr_info("Current regulatory domain intersected:\n");
1955 } else if (is_world_regdom(rd->alpha2))
1956 pr_info("World regulatory domain updated:\n");
1957 else {
1958 if (is_unknown_alpha2(rd->alpha2))
1959 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
1960 else
1961 pr_info("Regulatory domain changed to country: %c%c\n",
1962 rd->alpha2[0], rd->alpha2[1]);
1963 }
1964 print_rd_rules(rd);
1965 }
1966
1967 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1968 {
1969 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
1970 print_rd_rules(rd);
1971 }
1972
1973 /* Takes ownership of rd only if it doesn't fail */
1974 static int __set_regdom(const struct ieee80211_regdomain *rd)
1975 {
1976 const struct ieee80211_regdomain *intersected_rd = NULL;
1977 struct cfg80211_registered_device *rdev = NULL;
1978 struct wiphy *request_wiphy;
1979 /* Some basic sanity checks first */
1980
1981 if (is_world_regdom(rd->alpha2)) {
1982 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1983 return -EINVAL;
1984 update_world_regdomain(rd);
1985 return 0;
1986 }
1987
1988 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1989 !is_unknown_alpha2(rd->alpha2))
1990 return -EINVAL;
1991
1992 if (!last_request)
1993 return -EINVAL;
1994
1995 /*
1996 * Lets only bother proceeding on the same alpha2 if the current
1997 * rd is non static (it means CRDA was present and was used last)
1998 * and the pending request came in from a country IE
1999 */
2000 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2001 /*
2002 * If someone else asked us to change the rd lets only bother
2003 * checking if the alpha2 changes if CRDA was already called
2004 */
2005 if (!regdom_changes(rd->alpha2))
2006 return -EINVAL;
2007 }
2008
2009 /*
2010 * Now lets set the regulatory domain, update all driver channels
2011 * and finally inform them of what we have done, in case they want
2012 * to review or adjust their own settings based on their own
2013 * internal EEPROM data
2014 */
2015
2016 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2017 return -EINVAL;
2018
2019 if (!is_valid_rd(rd)) {
2020 pr_err("Invalid regulatory domain detected:\n");
2021 print_regdomain_info(rd);
2022 return -EINVAL;
2023 }
2024
2025 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2026
2027 if (!last_request->intersect) {
2028 int r;
2029
2030 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
2031 reset_regdomains();
2032 cfg80211_regdomain = rd;
2033 return 0;
2034 }
2035
2036 /*
2037 * For a driver hint, lets copy the regulatory domain the
2038 * driver wanted to the wiphy to deal with conflicts
2039 */
2040
2041 /*
2042 * Userspace could have sent two replies with only
2043 * one kernel request.
2044 */
2045 if (request_wiphy->regd)
2046 return -EALREADY;
2047
2048 r = reg_copy_regd(&request_wiphy->regd, rd);
2049 if (r)
2050 return r;
2051
2052 reset_regdomains();
2053 cfg80211_regdomain = rd;
2054 return 0;
2055 }
2056
2057 /* Intersection requires a bit more work */
2058
2059 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2060
2061 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2062 if (!intersected_rd)
2063 return -EINVAL;
2064
2065 /*
2066 * We can trash what CRDA provided now.
2067 * However if a driver requested this specific regulatory
2068 * domain we keep it for its private use
2069 */
2070 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
2071 request_wiphy->regd = rd;
2072 else
2073 kfree(rd);
2074
2075 rd = NULL;
2076
2077 reset_regdomains();
2078 cfg80211_regdomain = intersected_rd;
2079
2080 return 0;
2081 }
2082
2083 if (!intersected_rd)
2084 return -EINVAL;
2085
2086 rdev = wiphy_to_dev(request_wiphy);
2087
2088 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2089 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2090 rdev->env = last_request->country_ie_env;
2091
2092 BUG_ON(intersected_rd == rd);
2093
2094 kfree(rd);
2095 rd = NULL;
2096
2097 reset_regdomains();
2098 cfg80211_regdomain = intersected_rd;
2099
2100 return 0;
2101 }
2102
2103
2104 /*
2105 * Use this call to set the current regulatory domain. Conflicts with
2106 * multiple drivers can be ironed out later. Caller must've already
2107 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2108 */
2109 int set_regdom(const struct ieee80211_regdomain *rd)
2110 {
2111 int r;
2112
2113 assert_cfg80211_lock();
2114
2115 mutex_lock(&reg_mutex);
2116
2117 /* Note that this doesn't update the wiphys, this is done below */
2118 r = __set_regdom(rd);
2119 if (r) {
2120 kfree(rd);
2121 mutex_unlock(&reg_mutex);
2122 return r;
2123 }
2124
2125 /* This would make this whole thing pointless */
2126 if (!last_request->intersect)
2127 BUG_ON(rd != cfg80211_regdomain);
2128
2129 /* update all wiphys now with the new established regulatory domain */
2130 update_all_wiphy_regulatory(last_request->initiator);
2131
2132 print_regdomain(cfg80211_regdomain);
2133
2134 nl80211_send_reg_change_event(last_request);
2135
2136 reg_set_request_processed();
2137
2138 mutex_unlock(&reg_mutex);
2139
2140 return r;
2141 }
2142
2143 #ifdef CONFIG_HOTPLUG
2144 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2145 {
2146 if (last_request && !last_request->processed) {
2147 if (add_uevent_var(env, "COUNTRY=%c%c",
2148 last_request->alpha2[0],
2149 last_request->alpha2[1]))
2150 return -ENOMEM;
2151 }
2152
2153 return 0;
2154 }
2155 #else
2156 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2157 {
2158 return -ENODEV;
2159 }
2160 #endif /* CONFIG_HOTPLUG */
2161
2162 /* Caller must hold cfg80211_mutex */
2163 void reg_device_remove(struct wiphy *wiphy)
2164 {
2165 struct wiphy *request_wiphy = NULL;
2166
2167 assert_cfg80211_lock();
2168
2169 mutex_lock(&reg_mutex);
2170
2171 kfree(wiphy->regd);
2172
2173 if (last_request)
2174 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2175
2176 if (!request_wiphy || request_wiphy != wiphy)
2177 goto out;
2178
2179 last_request->wiphy_idx = WIPHY_IDX_STALE;
2180 last_request->country_ie_env = ENVIRON_ANY;
2181 out:
2182 mutex_unlock(&reg_mutex);
2183 }
2184
2185 static void reg_timeout_work(struct work_struct *work)
2186 {
2187 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "
2188 "restoring regulatory settings\n");
2189 restore_regulatory_settings(true);
2190 }
2191
2192 int __init regulatory_init(void)
2193 {
2194 int err = 0;
2195
2196 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2197 if (IS_ERR(reg_pdev))
2198 return PTR_ERR(reg_pdev);
2199
2200 reg_pdev->dev.type = &reg_device_type;
2201
2202 spin_lock_init(&reg_requests_lock);
2203 spin_lock_init(&reg_pending_beacons_lock);
2204
2205 cfg80211_regdomain = cfg80211_world_regdom;
2206
2207 user_alpha2[0] = '9';
2208 user_alpha2[1] = '7';
2209
2210 /* We always try to get an update for the static regdomain */
2211 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2212 if (err) {
2213 if (err == -ENOMEM)
2214 return err;
2215 /*
2216 * N.B. kobject_uevent_env() can fail mainly for when we're out
2217 * memory which is handled and propagated appropriately above
2218 * but it can also fail during a netlink_broadcast() or during
2219 * early boot for call_usermodehelper(). For now treat these
2220 * errors as non-fatal.
2221 */
2222 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2223 #ifdef CONFIG_CFG80211_REG_DEBUG
2224 /* We want to find out exactly why when debugging */
2225 WARN_ON(err);
2226 #endif
2227 }
2228
2229 /*
2230 * Finally, if the user set the module parameter treat it
2231 * as a user hint.
2232 */
2233 if (!is_world_regdom(ieee80211_regdom))
2234 regulatory_hint_user(ieee80211_regdom);
2235
2236 return 0;
2237 }
2238
2239 void /* __init_or_exit */ regulatory_exit(void)
2240 {
2241 struct regulatory_request *reg_request, *tmp;
2242 struct reg_beacon *reg_beacon, *btmp;
2243
2244 cancel_work_sync(&reg_work);
2245 cancel_delayed_work_sync(&reg_timeout);
2246
2247 mutex_lock(&cfg80211_mutex);
2248 mutex_lock(&reg_mutex);
2249
2250 reset_regdomains();
2251
2252 kfree(last_request);
2253
2254 platform_device_unregister(reg_pdev);
2255
2256 spin_lock_bh(&reg_pending_beacons_lock);
2257 if (!list_empty(&reg_pending_beacons)) {
2258 list_for_each_entry_safe(reg_beacon, btmp,
2259 &reg_pending_beacons, list) {
2260 list_del(&reg_beacon->list);
2261 kfree(reg_beacon);
2262 }
2263 }
2264 spin_unlock_bh(&reg_pending_beacons_lock);
2265
2266 if (!list_empty(&reg_beacon_list)) {
2267 list_for_each_entry_safe(reg_beacon, btmp,
2268 &reg_beacon_list, list) {
2269 list_del(&reg_beacon->list);
2270 kfree(reg_beacon);
2271 }
2272 }
2273
2274 spin_lock(&reg_requests_lock);
2275 if (!list_empty(&reg_requests_list)) {
2276 list_for_each_entry_safe(reg_request, tmp,
2277 &reg_requests_list, list) {
2278 list_del(&reg_request->list);
2279 kfree(reg_request);
2280 }
2281 }
2282 spin_unlock(&reg_requests_lock);
2283
2284 mutex_unlock(&reg_mutex);
2285 mutex_unlock(&cfg80211_mutex);
2286 }
linux-next