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r8169: fix wrong eee setting for rlt8111evl
[linux-2.6.git] / net / wireless / reg.c
blob68a471ba193f421937f952411659ef7d0fd8ab20
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 do { \
54 printk(KERN_DEBUG pr_fmt(format), ##args); \
55 } while (0)
56 #else
57 #define REG_DBG_PRINT(args...)
58 #endif
59
60 /* Receipt of information from last regulatory request */
61 static struct regulatory_request *last_request;
62
63 /* To trigger userspace events */
64 static struct platform_device *reg_pdev;
65
66 static struct device_type reg_device_type = {
67 .uevent = reg_device_uevent,
68 };
69
70 /*
71 * Central wireless core regulatory domains, we only need two,
72 * the current one and a world regulatory domain in case we have no
73 * information to give us an alpha2
74 */
75 const struct ieee80211_regdomain *cfg80211_regdomain;
76
77 /*
78 * Protects static reg.c components:
79 * - cfg80211_world_regdom
80 * - cfg80211_regdom
81 * - last_request
82 */
83 static DEFINE_MUTEX(reg_mutex);
84
85 static inline void assert_reg_lock(void)
86 {
87 lockdep_assert_held(&reg_mutex);
88 }
89
90 /* Used to queue up regulatory hints */
91 static LIST_HEAD(reg_requests_list);
92 static spinlock_t reg_requests_lock;
93
94 /* Used to queue up beacon hints for review */
95 static LIST_HEAD(reg_pending_beacons);
96 static spinlock_t reg_pending_beacons_lock;
97
98 /* Used to keep track of processed beacon hints */
99 static LIST_HEAD(reg_beacon_list);
100
101 struct reg_beacon {
102 struct list_head list;
103 struct ieee80211_channel chan;
104 };
105
106 static void reg_todo(struct work_struct *work);
107 static DECLARE_WORK(reg_work, reg_todo);
108
109 static void reg_timeout_work(struct work_struct *work);
110 static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
111
112 /* We keep a static world regulatory domain in case of the absence of CRDA */
113 static const struct ieee80211_regdomain world_regdom = {
114 .n_reg_rules = 5,
115 .alpha2 = "00",
116 .reg_rules = {
117 /* IEEE 802.11b/g, channels 1..11 */
118 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
119 /* IEEE 802.11b/g, channels 12..13. No HT40
120 * channel fits here. */
121 REG_RULE(2467-10, 2472+10, 20, 6, 20,
122 NL80211_RRF_PASSIVE_SCAN |
123 NL80211_RRF_NO_IBSS),
124 /* IEEE 802.11 channel 14 - Only JP enables
125 * this and for 802.11b only */
126 REG_RULE(2484-10, 2484+10, 20, 6, 20,
127 NL80211_RRF_PASSIVE_SCAN |
128 NL80211_RRF_NO_IBSS |
129 NL80211_RRF_NO_OFDM),
130 /* IEEE 802.11a, channel 36..48 */
131 REG_RULE(5180-10, 5240+10, 40, 6, 20,
132 NL80211_RRF_PASSIVE_SCAN |
133 NL80211_RRF_NO_IBSS),
134
135 /* NB: 5260 MHz - 5700 MHz requies DFS */
136
137 /* IEEE 802.11a, channel 149..165 */
138 REG_RULE(5745-10, 5825+10, 40, 6, 20,
139 NL80211_RRF_PASSIVE_SCAN |
140 NL80211_RRF_NO_IBSS),
141 }
142 };
143
144 static const struct ieee80211_regdomain *cfg80211_world_regdom =
145 &world_regdom;
146
147 static char *ieee80211_regdom = "00";
148 static char user_alpha2[2];
149
150 module_param(ieee80211_regdom, charp, 0444);
151 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
152
153 static void reset_regdomains(void)
154 {
155 /* avoid freeing static information or freeing something twice */
156 if (cfg80211_regdomain == cfg80211_world_regdom)
157 cfg80211_regdomain = NULL;
158 if (cfg80211_world_regdom == &world_regdom)
159 cfg80211_world_regdom = NULL;
160 if (cfg80211_regdomain == &world_regdom)
161 cfg80211_regdomain = NULL;
162
163 kfree(cfg80211_regdomain);
164 kfree(cfg80211_world_regdom);
165
166 cfg80211_world_regdom = &world_regdom;
167 cfg80211_regdomain = NULL;
168 }
169
170 /*
171 * Dynamic world regulatory domain requested by the wireless
172 * core upon initialization
173 */
174 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
175 {
176 BUG_ON(!last_request);
177
178 reset_regdomains();
179
180 cfg80211_world_regdom = rd;
181 cfg80211_regdomain = rd;
182 }
183
184 bool is_world_regdom(const char *alpha2)
185 {
186 if (!alpha2)
187 return false;
188 if (alpha2[0] == '0' && alpha2[1] == '0')
189 return true;
190 return false;
191 }
192
193 static bool is_alpha2_set(const char *alpha2)
194 {
195 if (!alpha2)
196 return false;
197 if (alpha2[0] != 0 && alpha2[1] != 0)
198 return true;
199 return false;
200 }
201
202 static bool is_unknown_alpha2(const char *alpha2)
203 {
204 if (!alpha2)
205 return false;
206 /*
207 * Special case where regulatory domain was built by driver
208 * but a specific alpha2 cannot be determined
209 */
210 if (alpha2[0] == '9' && alpha2[1] == '9')
211 return true;
212 return false;
213 }
214
215 static bool is_intersected_alpha2(const char *alpha2)
216 {
217 if (!alpha2)
218 return false;
219 /*
220 * Special case where regulatory domain is the
221 * result of an intersection between two regulatory domain
222 * structures
223 */
224 if (alpha2[0] == '9' && alpha2[1] == '8')
225 return true;
226 return false;
227 }
228
229 static bool is_an_alpha2(const char *alpha2)
230 {
231 if (!alpha2)
232 return false;
233 if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
234 return true;
235 return false;
236 }
237
238 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
239 {
240 if (!alpha2_x || !alpha2_y)
241 return false;
242 if (alpha2_x[0] == alpha2_y[0] &&
243 alpha2_x[1] == alpha2_y[1])
244 return true;
245 return false;
246 }
247
248 static bool regdom_changes(const char *alpha2)
249 {
250 assert_cfg80211_lock();
251
252 if (!cfg80211_regdomain)
253 return true;
254 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
255 return false;
256 return true;
257 }
258
259 /*
260 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
261 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
262 * has ever been issued.
263 */
264 static bool is_user_regdom_saved(void)
265 {
266 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
267 return false;
268
269 /* This would indicate a mistake on the design */
270 if (WARN((!is_world_regdom(user_alpha2) &&
271 !is_an_alpha2(user_alpha2)),
272 "Unexpected user alpha2: %c%c\n",
273 user_alpha2[0],
274 user_alpha2[1]))
275 return false;
276
277 return true;
278 }
279
280 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
281 const struct ieee80211_regdomain *src_regd)
282 {
283 struct ieee80211_regdomain *regd;
284 int size_of_regd = 0;
285 unsigned int i;
286
287 size_of_regd = sizeof(struct ieee80211_regdomain) +
288 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
289
290 regd = kzalloc(size_of_regd, GFP_KERNEL);
291 if (!regd)
292 return -ENOMEM;
293
294 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
295
296 for (i = 0; i < src_regd->n_reg_rules; i++)
297 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
298 sizeof(struct ieee80211_reg_rule));
299
300 *dst_regd = regd;
301 return 0;
302 }
303
304 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
305 struct reg_regdb_search_request {
306 char alpha2[2];
307 struct list_head list;
308 };
309
310 static LIST_HEAD(reg_regdb_search_list);
311 static DEFINE_MUTEX(reg_regdb_search_mutex);
312
313 static void reg_regdb_search(struct work_struct *work)
314 {
315 struct reg_regdb_search_request *request;
316 const struct ieee80211_regdomain *curdom, *regdom;
317 int i, r;
318
319 mutex_lock(&reg_regdb_search_mutex);
320 while (!list_empty(&reg_regdb_search_list)) {
321 request = list_first_entry(&reg_regdb_search_list,
322 struct reg_regdb_search_request,
323 list);
324 list_del(&request->list);
325
326 for (i=0; i<reg_regdb_size; i++) {
327 curdom = reg_regdb[i];
328
329 if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
330 r = reg_copy_regd(&regdom, curdom);
331 if (r)
332 break;
333 mutex_lock(&cfg80211_mutex);
334 set_regdom(regdom);
335 mutex_unlock(&cfg80211_mutex);
336 break;
337 }
338 }
339
340 kfree(request);
341 }
342 mutex_unlock(&reg_regdb_search_mutex);
343 }
344
345 static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
346
347 static void reg_regdb_query(const char *alpha2)
348 {
349 struct reg_regdb_search_request *request;
350
351 if (!alpha2)
352 return;
353
354 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
355 if (!request)
356 return;
357
358 memcpy(request->alpha2, alpha2, 2);
359
360 mutex_lock(&reg_regdb_search_mutex);
361 list_add_tail(&request->list, &reg_regdb_search_list);
362 mutex_unlock(&reg_regdb_search_mutex);
363
364 schedule_work(&reg_regdb_work);
365 }
366 #else
367 static inline void reg_regdb_query(const char *alpha2) {}
368 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
369
370 /*
371 * This lets us keep regulatory code which is updated on a regulatory
372 * basis in userspace. Country information is filled in by
373 * reg_device_uevent
374 */
375 static int call_crda(const char *alpha2)
376 {
377 if (!is_world_regdom((char *) alpha2))
378 pr_info("Calling CRDA for country: %c%c\n",
379 alpha2[0], alpha2[1]);
380 else
381 pr_info("Calling CRDA to update world regulatory domain\n");
382
383 /* query internal regulatory database (if it exists) */
384 reg_regdb_query(alpha2);
385
386 return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
387 }
388
389 /* Used by nl80211 before kmalloc'ing our regulatory domain */
390 bool reg_is_valid_request(const char *alpha2)
391 {
392 assert_cfg80211_lock();
393
394 if (!last_request)
395 return false;
396
397 return alpha2_equal(last_request->alpha2, alpha2);
398 }
399
400 /* Sanity check on a regulatory rule */
401 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
402 {
403 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
404 u32 freq_diff;
405
406 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
407 return false;
408
409 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
410 return false;
411
412 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
413
414 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
415 freq_range->max_bandwidth_khz > freq_diff)
416 return false;
417
418 return true;
419 }
420
421 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
422 {
423 const struct ieee80211_reg_rule *reg_rule = NULL;
424 unsigned int i;
425
426 if (!rd->n_reg_rules)
427 return false;
428
429 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
430 return false;
431
432 for (i = 0; i < rd->n_reg_rules; i++) {
433 reg_rule = &rd->reg_rules[i];
434 if (!is_valid_reg_rule(reg_rule))
435 return false;
436 }
437
438 return true;
439 }
440
441 static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
442 u32 center_freq_khz,
443 u32 bw_khz)
444 {
445 u32 start_freq_khz, end_freq_khz;
446
447 start_freq_khz = center_freq_khz - (bw_khz/2);
448 end_freq_khz = center_freq_khz + (bw_khz/2);
449
450 if (start_freq_khz >= freq_range->start_freq_khz &&
451 end_freq_khz <= freq_range->end_freq_khz)
452 return true;
453
454 return false;
455 }
456
457 /**
458 * freq_in_rule_band - tells us if a frequency is in a frequency band
459 * @freq_range: frequency rule we want to query
460 * @freq_khz: frequency we are inquiring about
461 *
462 * This lets us know if a specific frequency rule is or is not relevant to
463 * a specific frequency's band. Bands are device specific and artificial
464 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
465 * safe for now to assume that a frequency rule should not be part of a
466 * frequency's band if the start freq or end freq are off by more than 2 GHz.
467 * This resolution can be lowered and should be considered as we add
468 * regulatory rule support for other "bands".
469 **/
470 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
471 u32 freq_khz)
472 {
473 #define ONE_GHZ_IN_KHZ 1000000
474 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
475 return true;
476 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
477 return true;
478 return false;
479 #undef ONE_GHZ_IN_KHZ
480 }
481
482 /*
483 * Helper for regdom_intersect(), this does the real
484 * mathematical intersection fun
485 */
486 static int reg_rules_intersect(
487 const struct ieee80211_reg_rule *rule1,
488 const struct ieee80211_reg_rule *rule2,
489 struct ieee80211_reg_rule *intersected_rule)
490 {
491 const struct ieee80211_freq_range *freq_range1, *freq_range2;
492 struct ieee80211_freq_range *freq_range;
493 const struct ieee80211_power_rule *power_rule1, *power_rule2;
494 struct ieee80211_power_rule *power_rule;
495 u32 freq_diff;
496
497 freq_range1 = &rule1->freq_range;
498 freq_range2 = &rule2->freq_range;
499 freq_range = &intersected_rule->freq_range;
500
501 power_rule1 = &rule1->power_rule;
502 power_rule2 = &rule2->power_rule;
503 power_rule = &intersected_rule->power_rule;
504
505 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
506 freq_range2->start_freq_khz);
507 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
508 freq_range2->end_freq_khz);
509 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
510 freq_range2->max_bandwidth_khz);
511
512 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
513 if (freq_range->max_bandwidth_khz > freq_diff)
514 freq_range->max_bandwidth_khz = freq_diff;
515
516 power_rule->max_eirp = min(power_rule1->max_eirp,
517 power_rule2->max_eirp);
518 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
519 power_rule2->max_antenna_gain);
520
521 intersected_rule->flags = (rule1->flags | rule2->flags);
522
523 if (!is_valid_reg_rule(intersected_rule))
524 return -EINVAL;
525
526 return 0;
527 }
528
529 /**
530 * regdom_intersect - do the intersection between two regulatory domains
531 * @rd1: first regulatory domain
532 * @rd2: second regulatory domain
533 *
534 * Use this function to get the intersection between two regulatory domains.
535 * Once completed we will mark the alpha2 for the rd as intersected, "98",
536 * as no one single alpha2 can represent this regulatory domain.
537 *
538 * Returns a pointer to the regulatory domain structure which will hold the
539 * resulting intersection of rules between rd1 and rd2. We will
540 * kzalloc() this structure for you.
541 */
542 static struct ieee80211_regdomain *regdom_intersect(
543 const struct ieee80211_regdomain *rd1,
544 const struct ieee80211_regdomain *rd2)
545 {
546 int r, size_of_regd;
547 unsigned int x, y;
548 unsigned int num_rules = 0, rule_idx = 0;
549 const struct ieee80211_reg_rule *rule1, *rule2;
550 struct ieee80211_reg_rule *intersected_rule;
551 struct ieee80211_regdomain *rd;
552 /* This is just a dummy holder to help us count */
553 struct ieee80211_reg_rule irule;
554
555 /* Uses the stack temporarily for counter arithmetic */
556 intersected_rule = &irule;
557
558 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
559
560 if (!rd1 || !rd2)
561 return NULL;
562
563 /*
564 * First we get a count of the rules we'll need, then we actually
565 * build them. This is to so we can malloc() and free() a
566 * regdomain once. The reason we use reg_rules_intersect() here
567 * is it will return -EINVAL if the rule computed makes no sense.
568 * All rules that do check out OK are valid.
569 */
570
571 for (x = 0; x < rd1->n_reg_rules; x++) {
572 rule1 = &rd1->reg_rules[x];
573 for (y = 0; y < rd2->n_reg_rules; y++) {
574 rule2 = &rd2->reg_rules[y];
575 if (!reg_rules_intersect(rule1, rule2,
576 intersected_rule))
577 num_rules++;
578 memset(intersected_rule, 0,
579 sizeof(struct ieee80211_reg_rule));
580 }
581 }
582
583 if (!num_rules)
584 return NULL;
585
586 size_of_regd = sizeof(struct ieee80211_regdomain) +
587 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
588
589 rd = kzalloc(size_of_regd, GFP_KERNEL);
590 if (!rd)
591 return NULL;
592
593 for (x = 0; x < rd1->n_reg_rules; x++) {
594 rule1 = &rd1->reg_rules[x];
595 for (y = 0; y < rd2->n_reg_rules; y++) {
596 rule2 = &rd2->reg_rules[y];
597 /*
598 * This time around instead of using the stack lets
599 * write to the target rule directly saving ourselves
600 * a memcpy()
601 */
602 intersected_rule = &rd->reg_rules[rule_idx];
603 r = reg_rules_intersect(rule1, rule2,
604 intersected_rule);
605 /*
606 * No need to memset here the intersected rule here as
607 * we're not using the stack anymore
608 */
609 if (r)
610 continue;
611 rule_idx++;
612 }
613 }
614
615 if (rule_idx != num_rules) {
616 kfree(rd);
617 return NULL;
618 }
619
620 rd->n_reg_rules = num_rules;
621 rd->alpha2[0] = '9';
622 rd->alpha2[1] = '8';
623
624 return rd;
625 }
626
627 /*
628 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
629 * want to just have the channel structure use these
630 */
631 static u32 map_regdom_flags(u32 rd_flags)
632 {
633 u32 channel_flags = 0;
634 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
635 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
636 if (rd_flags & NL80211_RRF_NO_IBSS)
637 channel_flags |= IEEE80211_CHAN_NO_IBSS;
638 if (rd_flags & NL80211_RRF_DFS)
639 channel_flags |= IEEE80211_CHAN_RADAR;
640 return channel_flags;
641 }
642
643 static int freq_reg_info_regd(struct wiphy *wiphy,
644 u32 center_freq,
645 u32 desired_bw_khz,
646 const struct ieee80211_reg_rule **reg_rule,
647 const struct ieee80211_regdomain *custom_regd)
648 {
649 int i;
650 bool band_rule_found = false;
651 const struct ieee80211_regdomain *regd;
652 bool bw_fits = false;
653
654 if (!desired_bw_khz)
655 desired_bw_khz = MHZ_TO_KHZ(20);
656
657 regd = custom_regd ? custom_regd : cfg80211_regdomain;
658
659 /*
660 * Follow the driver's regulatory domain, if present, unless a country
661 * IE has been processed or a user wants to help complaince further
662 */
663 if (!custom_regd &&
664 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
665 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
666 wiphy->regd)
667 regd = wiphy->regd;
668
669 if (!regd)
670 return -EINVAL;
671
672 for (i = 0; i < regd->n_reg_rules; i++) {
673 const struct ieee80211_reg_rule *rr;
674 const struct ieee80211_freq_range *fr = NULL;
675
676 rr = &regd->reg_rules[i];
677 fr = &rr->freq_range;
678
679 /*
680 * We only need to know if one frequency rule was
681 * was in center_freq's band, that's enough, so lets
682 * not overwrite it once found
683 */
684 if (!band_rule_found)
685 band_rule_found = freq_in_rule_band(fr, center_freq);
686
687 bw_fits = reg_does_bw_fit(fr,
688 center_freq,
689 desired_bw_khz);
690
691 if (band_rule_found && bw_fits) {
692 *reg_rule = rr;
693 return 0;
694 }
695 }
696
697 if (!band_rule_found)
698 return -ERANGE;
699
700 return -EINVAL;
701 }
702
703 int freq_reg_info(struct wiphy *wiphy,
704 u32 center_freq,
705 u32 desired_bw_khz,
706 const struct ieee80211_reg_rule **reg_rule)
707 {
708 assert_cfg80211_lock();
709 return freq_reg_info_regd(wiphy,
710 center_freq,
711 desired_bw_khz,
712 reg_rule,
713 NULL);
714 }
715 EXPORT_SYMBOL(freq_reg_info);
716
717 #ifdef CONFIG_CFG80211_REG_DEBUG
718 static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
719 {
720 switch (initiator) {
721 case NL80211_REGDOM_SET_BY_CORE:
722 return "Set by core";
723 case NL80211_REGDOM_SET_BY_USER:
724 return "Set by user";
725 case NL80211_REGDOM_SET_BY_DRIVER:
726 return "Set by driver";
727 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
728 return "Set by country IE";
729 default:
730 WARN_ON(1);
731 return "Set by bug";
732 }
733 }
734
735 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
736 u32 desired_bw_khz,
737 const struct ieee80211_reg_rule *reg_rule)
738 {
739 const struct ieee80211_power_rule *power_rule;
740 const struct ieee80211_freq_range *freq_range;
741 char max_antenna_gain[32];
742
743 power_rule = &reg_rule->power_rule;
744 freq_range = &reg_rule->freq_range;
745
746 if (!power_rule->max_antenna_gain)
747 snprintf(max_antenna_gain, 32, "N/A");
748 else
749 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
750
751 REG_DBG_PRINT("Updating information on frequency %d MHz "
752 "for a %d MHz width channel with regulatory rule:\n",
753 chan->center_freq,
754 KHZ_TO_MHZ(desired_bw_khz));
755
756 REG_DBG_PRINT("%d KHz - %d KHz @ KHz), (%s mBi, %d mBm)\n",
757 freq_range->start_freq_khz,
758 freq_range->end_freq_khz,
759 max_antenna_gain,
760 power_rule->max_eirp);
761 }
762 #else
763 static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
764 u32 desired_bw_khz,
765 const struct ieee80211_reg_rule *reg_rule)
766 {
767 return;
768 }
769 #endif
770
771 /*
772 * Note that right now we assume the desired channel bandwidth
773 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
774 * per channel, the primary and the extension channel). To support
775 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
776 * new ieee80211_channel.target_bw and re run the regulatory check
777 * on the wiphy with the target_bw specified. Then we can simply use
778 * that below for the desired_bw_khz below.
779 */
780 static void handle_channel(struct wiphy *wiphy,
781 enum nl80211_reg_initiator initiator,
782 enum ieee80211_band band,
783 unsigned int chan_idx)
784 {
785 int r;
786 u32 flags, bw_flags = 0;
787 u32 desired_bw_khz = MHZ_TO_KHZ(20);
788 const struct ieee80211_reg_rule *reg_rule = NULL;
789 const struct ieee80211_power_rule *power_rule = NULL;
790 const struct ieee80211_freq_range *freq_range = NULL;
791 struct ieee80211_supported_band *sband;
792 struct ieee80211_channel *chan;
793 struct wiphy *request_wiphy = NULL;
794
795 assert_cfg80211_lock();
796
797 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
798
799 sband = wiphy->bands[band];
800 BUG_ON(chan_idx >= sband->n_channels);
801 chan = &sband->channels[chan_idx];
802
803 flags = chan->orig_flags;
804
805 r = freq_reg_info(wiphy,
806 MHZ_TO_KHZ(chan->center_freq),
807 desired_bw_khz,
808 &reg_rule);
809
810 if (r) {
811 /*
812 * We will disable all channels that do not match our
813 * received regulatory rule unless the hint is coming
814 * from a Country IE and the Country IE had no information
815 * about a band. The IEEE 802.11 spec allows for an AP
816 * to send only a subset of the regulatory rules allowed,
817 * so an AP in the US that only supports 2.4 GHz may only send
818 * a country IE with information for the 2.4 GHz band
819 * while 5 GHz is still supported.
820 */
821 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
822 r == -ERANGE)
823 return;
824
825 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
826 chan->flags = IEEE80211_CHAN_DISABLED;
827 return;
828 }
829
830 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
831
832 power_rule = &reg_rule->power_rule;
833 freq_range = &reg_rule->freq_range;
834
835 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
836 bw_flags = IEEE80211_CHAN_NO_HT40;
837
838 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
839 request_wiphy && request_wiphy == wiphy &&
840 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
841 /*
842 * This guarantees the driver's requested regulatory domain
843 * will always be used as a base for further regulatory
844 * settings
845 */
846 chan->flags = chan->orig_flags =
847 map_regdom_flags(reg_rule->flags) | bw_flags;
848 chan->max_antenna_gain = chan->orig_mag =
849 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
850 chan->max_power = chan->orig_mpwr =
851 (int) MBM_TO_DBM(power_rule->max_eirp);
852 return;
853 }
854
855 chan->beacon_found = false;
856 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
857 chan->max_antenna_gain = min(chan->orig_mag,
858 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
859 if (chan->orig_mpwr)
860 chan->max_power = min(chan->orig_mpwr,
861 (int) MBM_TO_DBM(power_rule->max_eirp));
862 else
863 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
864 }
865
866 static void handle_band(struct wiphy *wiphy,
867 enum ieee80211_band band,
868 enum nl80211_reg_initiator initiator)
869 {
870 unsigned int i;
871 struct ieee80211_supported_band *sband;
872
873 BUG_ON(!wiphy->bands[band]);
874 sband = wiphy->bands[band];
875
876 for (i = 0; i < sband->n_channels; i++)
877 handle_channel(wiphy, initiator, band, i);
878 }
879
880 static bool ignore_reg_update(struct wiphy *wiphy,
881 enum nl80211_reg_initiator initiator)
882 {
883 if (!last_request) {
884 REG_DBG_PRINT("Ignoring regulatory request %s since "
885 "last_request is not set\n",
886 reg_initiator_name(initiator));
887 return true;
888 }
889
890 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
891 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
892 REG_DBG_PRINT("Ignoring regulatory request %s "
893 "since the driver uses its own custom "
894 "regulatory domain ",
895 reg_initiator_name(initiator));
896 return true;
897 }
898
899 /*
900 * wiphy->regd will be set once the device has its own
901 * desired regulatory domain set
902 */
903 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
904 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
905 !is_world_regdom(last_request->alpha2)) {
906 REG_DBG_PRINT("Ignoring regulatory request %s "
907 "since the driver requires its own regulatory "
908 "domain to be set first",
909 reg_initiator_name(initiator));
910 return true;
911 }
912
913 return false;
914 }
915
916 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
917 {
918 struct cfg80211_registered_device *rdev;
919
920 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
921 wiphy_update_regulatory(&rdev->wiphy, initiator);
922 }
923
924 static void handle_reg_beacon(struct wiphy *wiphy,
925 unsigned int chan_idx,
926 struct reg_beacon *reg_beacon)
927 {
928 struct ieee80211_supported_band *sband;
929 struct ieee80211_channel *chan;
930 bool channel_changed = false;
931 struct ieee80211_channel chan_before;
932
933 assert_cfg80211_lock();
934
935 sband = wiphy->bands[reg_beacon->chan.band];
936 chan = &sband->channels[chan_idx];
937
938 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
939 return;
940
941 if (chan->beacon_found)
942 return;
943
944 chan->beacon_found = true;
945
946 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
947 return;
948
949 chan_before.center_freq = chan->center_freq;
950 chan_before.flags = chan->flags;
951
952 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
953 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
954 channel_changed = true;
955 }
956
957 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
958 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
959 channel_changed = true;
960 }
961
962 if (channel_changed)
963 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
964 }
965
966 /*
967 * Called when a scan on a wiphy finds a beacon on
968 * new channel
969 */
970 static void wiphy_update_new_beacon(struct wiphy *wiphy,
971 struct reg_beacon *reg_beacon)
972 {
973 unsigned int i;
974 struct ieee80211_supported_band *sband;
975
976 assert_cfg80211_lock();
977
978 if (!wiphy->bands[reg_beacon->chan.band])
979 return;
980
981 sband = wiphy->bands[reg_beacon->chan.band];
982
983 for (i = 0; i < sband->n_channels; i++)
984 handle_reg_beacon(wiphy, i, reg_beacon);
985 }
986
987 /*
988 * Called upon reg changes or a new wiphy is added
989 */
990 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
991 {
992 unsigned int i;
993 struct ieee80211_supported_band *sband;
994 struct reg_beacon *reg_beacon;
995
996 assert_cfg80211_lock();
997
998 if (list_empty(&reg_beacon_list))
999 return;
1000
1001 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1002 if (!wiphy->bands[reg_beacon->chan.band])
1003 continue;
1004 sband = wiphy->bands[reg_beacon->chan.band];
1005 for (i = 0; i < sband->n_channels; i++)
1006 handle_reg_beacon(wiphy, i, reg_beacon);
1007 }
1008 }
1009
1010 static bool reg_is_world_roaming(struct wiphy *wiphy)
1011 {
1012 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1013 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1014 return true;
1015 if (last_request &&
1016 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1017 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1018 return true;
1019 return false;
1020 }
1021
1022 /* Reap the advantages of previously found beacons */
1023 static void reg_process_beacons(struct wiphy *wiphy)
1024 {
1025 /*
1026 * Means we are just firing up cfg80211, so no beacons would
1027 * have been processed yet.
1028 */
1029 if (!last_request)
1030 return;
1031 if (!reg_is_world_roaming(wiphy))
1032 return;
1033 wiphy_update_beacon_reg(wiphy);
1034 }
1035
1036 static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1037 {
1038 if (!chan)
1039 return true;
1040 if (chan->flags & IEEE80211_CHAN_DISABLED)
1041 return true;
1042 /* This would happen when regulatory rules disallow HT40 completely */
1043 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1044 return true;
1045 return false;
1046 }
1047
1048 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1049 enum ieee80211_band band,
1050 unsigned int chan_idx)
1051 {
1052 struct ieee80211_supported_band *sband;
1053 struct ieee80211_channel *channel;
1054 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1055 unsigned int i;
1056
1057 assert_cfg80211_lock();
1058
1059 sband = wiphy->bands[band];
1060 BUG_ON(chan_idx >= sband->n_channels);
1061 channel = &sband->channels[chan_idx];
1062
1063 if (is_ht40_not_allowed(channel)) {
1064 channel->flags |= IEEE80211_CHAN_NO_HT40;
1065 return;
1066 }
1067
1068 /*
1069 * We need to ensure the extension channels exist to
1070 * be able to use HT40- or HT40+, this finds them (or not)
1071 */
1072 for (i = 0; i < sband->n_channels; i++) {
1073 struct ieee80211_channel *c = &sband->channels[i];
1074 if (c->center_freq == (channel->center_freq - 20))
1075 channel_before = c;
1076 if (c->center_freq == (channel->center_freq + 20))
1077 channel_after = c;
1078 }
1079
1080 /*
1081 * Please note that this assumes target bandwidth is 20 MHz,
1082 * if that ever changes we also need to change the below logic
1083 * to include that as well.
1084 */
1085 if (is_ht40_not_allowed(channel_before))
1086 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
1087 else
1088 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
1089
1090 if (is_ht40_not_allowed(channel_after))
1091 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
1092 else
1093 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
1094 }
1095
1096 static void reg_process_ht_flags_band(struct wiphy *wiphy,
1097 enum ieee80211_band band)
1098 {
1099 unsigned int i;
1100 struct ieee80211_supported_band *sband;
1101
1102 BUG_ON(!wiphy->bands[band]);
1103 sband = wiphy->bands[band];
1104
1105 for (i = 0; i < sband->n_channels; i++)
1106 reg_process_ht_flags_channel(wiphy, band, i);
1107 }
1108
1109 static void reg_process_ht_flags(struct wiphy *wiphy)
1110 {
1111 enum ieee80211_band band;
1112
1113 if (!wiphy)
1114 return;
1115
1116 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1117 if (wiphy->bands[band])
1118 reg_process_ht_flags_band(wiphy, band);
1119 }
1120
1121 }
1122
1123 void wiphy_update_regulatory(struct wiphy *wiphy,
1124 enum nl80211_reg_initiator initiator)
1125 {
1126 enum ieee80211_band band;
1127
1128 if (ignore_reg_update(wiphy, initiator))
1129 return;
1130
1131 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1132 if (wiphy->bands[band])
1133 handle_band(wiphy, band, initiator);
1134 }
1135
1136 reg_process_beacons(wiphy);
1137 reg_process_ht_flags(wiphy);
1138 if (wiphy->reg_notifier)
1139 wiphy->reg_notifier(wiphy, last_request);
1140 }
1141
1142 static void handle_channel_custom(struct wiphy *wiphy,
1143 enum ieee80211_band band,
1144 unsigned int chan_idx,
1145 const struct ieee80211_regdomain *regd)
1146 {
1147 int r;
1148 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1149 u32 bw_flags = 0;
1150 const struct ieee80211_reg_rule *reg_rule = NULL;
1151 const struct ieee80211_power_rule *power_rule = NULL;
1152 const struct ieee80211_freq_range *freq_range = NULL;
1153 struct ieee80211_supported_band *sband;
1154 struct ieee80211_channel *chan;
1155
1156 assert_reg_lock();
1157
1158 sband = wiphy->bands[band];
1159 BUG_ON(chan_idx >= sband->n_channels);
1160 chan = &sband->channels[chan_idx];
1161
1162 r = freq_reg_info_regd(wiphy,
1163 MHZ_TO_KHZ(chan->center_freq),
1164 desired_bw_khz,
1165 &reg_rule,
1166 regd);
1167
1168 if (r) {
1169 REG_DBG_PRINT("Disabling freq %d MHz as custom "
1170 "regd has no rule that fits a %d MHz "
1171 "wide channel\n",
1172 chan->center_freq,
1173 KHZ_TO_MHZ(desired_bw_khz));
1174 chan->flags = IEEE80211_CHAN_DISABLED;
1175 return;
1176 }
1177
1178 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1179
1180 power_rule = &reg_rule->power_rule;
1181 freq_range = &reg_rule->freq_range;
1182
1183 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1184 bw_flags = IEEE80211_CHAN_NO_HT40;
1185
1186 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
1187 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1188 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1189 }
1190
1191 static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1192 const struct ieee80211_regdomain *regd)
1193 {
1194 unsigned int i;
1195 struct ieee80211_supported_band *sband;
1196
1197 BUG_ON(!wiphy->bands[band]);
1198 sband = wiphy->bands[band];
1199
1200 for (i = 0; i < sband->n_channels; i++)
1201 handle_channel_custom(wiphy, band, i, regd);
1202 }
1203
1204 /* Used by drivers prior to wiphy registration */
1205 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1206 const struct ieee80211_regdomain *regd)
1207 {
1208 enum ieee80211_band band;
1209 unsigned int bands_set = 0;
1210
1211 mutex_lock(&reg_mutex);
1212 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1213 if (!wiphy->bands[band])
1214 continue;
1215 handle_band_custom(wiphy, band, regd);
1216 bands_set++;
1217 }
1218 mutex_unlock(&reg_mutex);
1219
1220 /*
1221 * no point in calling this if it won't have any effect
1222 * on your device's supportd bands.
1223 */
1224 WARN_ON(!bands_set);
1225 }
1226 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1227
1228 /*
1229 * Return value which can be used by ignore_request() to indicate
1230 * it has been determined we should intersect two regulatory domains
1231 */
1232 #define REG_INTERSECT 1
1233
1234 /* This has the logic which determines when a new request
1235 * should be ignored. */
1236 static int ignore_request(struct wiphy *wiphy,
1237 struct regulatory_request *pending_request)
1238 {
1239 struct wiphy *last_wiphy = NULL;
1240
1241 assert_cfg80211_lock();
1242
1243 /* All initial requests are respected */
1244 if (!last_request)
1245 return 0;
1246
1247 switch (pending_request->initiator) {
1248 case NL80211_REGDOM_SET_BY_CORE:
1249 return 0;
1250 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
1251
1252 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1253
1254 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
1255 return -EINVAL;
1256 if (last_request->initiator ==
1257 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1258 if (last_wiphy != wiphy) {
1259 /*
1260 * Two cards with two APs claiming different
1261 * Country IE alpha2s. We could
1262 * intersect them, but that seems unlikely
1263 * to be correct. Reject second one for now.
1264 */
1265 if (regdom_changes(pending_request->alpha2))
1266 return -EOPNOTSUPP;
1267 return -EALREADY;
1268 }
1269 /*
1270 * Two consecutive Country IE hints on the same wiphy.
1271 * This should be picked up early by the driver/stack
1272 */
1273 if (WARN_ON(regdom_changes(pending_request->alpha2)))
1274 return 0;
1275 return -EALREADY;
1276 }
1277 return 0;
1278 case NL80211_REGDOM_SET_BY_DRIVER:
1279 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
1280 if (regdom_changes(pending_request->alpha2))
1281 return 0;
1282 return -EALREADY;
1283 }
1284
1285 /*
1286 * This would happen if you unplug and plug your card
1287 * back in or if you add a new device for which the previously
1288 * loaded card also agrees on the regulatory domain.
1289 */
1290 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1291 !regdom_changes(pending_request->alpha2))
1292 return -EALREADY;
1293
1294 return REG_INTERSECT;
1295 case NL80211_REGDOM_SET_BY_USER:
1296 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
1297 return REG_INTERSECT;
1298 /*
1299 * If the user knows better the user should set the regdom
1300 * to their country before the IE is picked up
1301 */
1302 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
1303 last_request->intersect)
1304 return -EOPNOTSUPP;
1305 /*
1306 * Process user requests only after previous user/driver/core
1307 * requests have been processed
1308 */
1309 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1310 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1311 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1312 if (regdom_changes(last_request->alpha2))
1313 return -EAGAIN;
1314 }
1315
1316 if (!regdom_changes(pending_request->alpha2))
1317 return -EALREADY;
1318
1319 return 0;
1320 }
1321
1322 return -EINVAL;
1323 }
1324
1325 static void reg_set_request_processed(void)
1326 {
1327 bool need_more_processing = false;
1328
1329 last_request->processed = true;
1330
1331 spin_lock(&reg_requests_lock);
1332 if (!list_empty(&reg_requests_list))
1333 need_more_processing = true;
1334 spin_unlock(&reg_requests_lock);
1335
1336 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
1337 cancel_delayed_work_sync(&reg_timeout);
1338
1339 if (need_more_processing)
1340 schedule_work(&reg_work);
1341 }
1342
1343 /**
1344 * __regulatory_hint - hint to the wireless core a regulatory domain
1345 * @wiphy: if the hint comes from country information from an AP, this
1346 * is required to be set to the wiphy that received the information
1347 * @pending_request: the regulatory request currently being processed
1348 *
1349 * The Wireless subsystem can use this function to hint to the wireless core
1350 * what it believes should be the current regulatory domain.
1351 *
1352 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1353 * already been set or other standard error codes.
1354 *
1355 * Caller must hold &cfg80211_mutex and &reg_mutex
1356 */
1357 static int __regulatory_hint(struct wiphy *wiphy,
1358 struct regulatory_request *pending_request)
1359 {
1360 bool intersect = false;
1361 int r = 0;
1362
1363 assert_cfg80211_lock();
1364
1365 r = ignore_request(wiphy, pending_request);
1366
1367 if (r == REG_INTERSECT) {
1368 if (pending_request->initiator ==
1369 NL80211_REGDOM_SET_BY_DRIVER) {
1370 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1371 if (r) {
1372 kfree(pending_request);
1373 return r;
1374 }
1375 }
1376 intersect = true;
1377 } else if (r) {
1378 /*
1379 * If the regulatory domain being requested by the
1380 * driver has already been set just copy it to the
1381 * wiphy
1382 */
1383 if (r == -EALREADY &&
1384 pending_request->initiator ==
1385 NL80211_REGDOM_SET_BY_DRIVER) {
1386 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1387 if (r) {
1388 kfree(pending_request);
1389 return r;
1390 }
1391 r = -EALREADY;
1392 goto new_request;
1393 }
1394 kfree(pending_request);
1395 return r;
1396 }
1397
1398 new_request:
1399 kfree(last_request);
1400
1401 last_request = pending_request;
1402 last_request->intersect = intersect;
1403
1404 pending_request = NULL;
1405
1406 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1407 user_alpha2[0] = last_request->alpha2[0];
1408 user_alpha2[1] = last_request->alpha2[1];
1409 }
1410
1411 /* When r == REG_INTERSECT we do need to call CRDA */
1412 if (r < 0) {
1413 /*
1414 * Since CRDA will not be called in this case as we already
1415 * have applied the requested regulatory domain before we just
1416 * inform userspace we have processed the request
1417 */
1418 if (r == -EALREADY) {
1419 nl80211_send_reg_change_event(last_request);
1420 reg_set_request_processed();
1421 }
1422 return r;
1423 }
1424
1425 return call_crda(last_request->alpha2);
1426 }
1427
1428 /* This processes *all* regulatory hints */
1429 static void reg_process_hint(struct regulatory_request *reg_request)
1430 {
1431 int r = 0;
1432 struct wiphy *wiphy = NULL;
1433 enum nl80211_reg_initiator initiator = reg_request->initiator;
1434
1435 BUG_ON(!reg_request->alpha2);
1436
1437 if (wiphy_idx_valid(reg_request->wiphy_idx))
1438 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1439
1440 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
1441 !wiphy) {
1442 kfree(reg_request);
1443 return;
1444 }
1445
1446 r = __regulatory_hint(wiphy, reg_request);
1447 /* This is required so that the orig_* parameters are saved */
1448 if (r == -EALREADY && wiphy &&
1449 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
1450 wiphy_update_regulatory(wiphy, initiator);
1451 return;
1452 }
1453
1454 /*
1455 * We only time out user hints, given that they should be the only
1456 * source of bogus requests.
1457 */
1458 if (r != -EALREADY &&
1459 reg_request->initiator == NL80211_REGDOM_SET_BY_USER)
1460 schedule_delayed_work(&reg_timeout, msecs_to_jiffies(3142));
1461 }
1462
1463 /*
1464 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1465 * Regulatory hints come on a first come first serve basis and we
1466 * must process each one atomically.
1467 */
1468 static void reg_process_pending_hints(void)
1469 {
1470 struct regulatory_request *reg_request;
1471
1472 mutex_lock(&cfg80211_mutex);
1473 mutex_lock(&reg_mutex);
1474
1475 /* When last_request->processed becomes true this will be rescheduled */
1476 if (last_request && !last_request->processed) {
1477 REG_DBG_PRINT("Pending regulatory request, waiting "
1478 "for it to be processed...");
1479 goto out;
1480 }
1481
1482 spin_lock(&reg_requests_lock);
1483
1484 if (list_empty(&reg_requests_list)) {
1485 spin_unlock(&reg_requests_lock);
1486 goto out;
1487 }
1488
1489 reg_request = list_first_entry(&reg_requests_list,
1490 struct regulatory_request,
1491 list);
1492 list_del_init(&reg_request->list);
1493
1494 spin_unlock(&reg_requests_lock);
1495
1496 reg_process_hint(reg_request);
1497
1498 out:
1499 mutex_unlock(&reg_mutex);
1500 mutex_unlock(&cfg80211_mutex);
1501 }
1502
1503 /* Processes beacon hints -- this has nothing to do with country IEs */
1504 static void reg_process_pending_beacon_hints(void)
1505 {
1506 struct cfg80211_registered_device *rdev;
1507 struct reg_beacon *pending_beacon, *tmp;
1508
1509 /*
1510 * No need to hold the reg_mutex here as we just touch wiphys
1511 * and do not read or access regulatory variables.
1512 */
1513 mutex_lock(&cfg80211_mutex);
1514
1515 /* This goes through the _pending_ beacon list */
1516 spin_lock_bh(&reg_pending_beacons_lock);
1517
1518 if (list_empty(&reg_pending_beacons)) {
1519 spin_unlock_bh(&reg_pending_beacons_lock);
1520 goto out;
1521 }
1522
1523 list_for_each_entry_safe(pending_beacon, tmp,
1524 &reg_pending_beacons, list) {
1525
1526 list_del_init(&pending_beacon->list);
1527
1528 /* Applies the beacon hint to current wiphys */
1529 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1530 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
1531
1532 /* Remembers the beacon hint for new wiphys or reg changes */
1533 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1534 }
1535
1536 spin_unlock_bh(&reg_pending_beacons_lock);
1537 out:
1538 mutex_unlock(&cfg80211_mutex);
1539 }
1540
1541 static void reg_todo(struct work_struct *work)
1542 {
1543 reg_process_pending_hints();
1544 reg_process_pending_beacon_hints();
1545 }
1546
1547 static void queue_regulatory_request(struct regulatory_request *request)
1548 {
1549 if (isalpha(request->alpha2[0]))
1550 request->alpha2[0] = toupper(request->alpha2[0]);
1551 if (isalpha(request->alpha2[1]))
1552 request->alpha2[1] = toupper(request->alpha2[1]);
1553
1554 spin_lock(&reg_requests_lock);
1555 list_add_tail(&request->list, &reg_requests_list);
1556 spin_unlock(&reg_requests_lock);
1557
1558 schedule_work(&reg_work);
1559 }
1560
1561 /*
1562 * Core regulatory hint -- happens during cfg80211_init()
1563 * and when we restore regulatory settings.
1564 */
1565 static int regulatory_hint_core(const char *alpha2)
1566 {
1567 struct regulatory_request *request;
1568
1569 kfree(last_request);
1570 last_request = NULL;
1571
1572 request = kzalloc(sizeof(struct regulatory_request),
1573 GFP_KERNEL);
1574 if (!request)
1575 return -ENOMEM;
1576
1577 request->alpha2[0] = alpha2[0];
1578 request->alpha2[1] = alpha2[1];
1579 request->initiator = NL80211_REGDOM_SET_BY_CORE;
1580
1581 queue_regulatory_request(request);
1582
1583 return 0;
1584 }
1585
1586 /* User hints */
1587 int regulatory_hint_user(const char *alpha2)
1588 {
1589 struct regulatory_request *request;
1590
1591 BUG_ON(!alpha2);
1592
1593 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1594 if (!request)
1595 return -ENOMEM;
1596
1597 request->wiphy_idx = WIPHY_IDX_STALE;
1598 request->alpha2[0] = alpha2[0];
1599 request->alpha2[1] = alpha2[1];
1600 request->initiator = NL80211_REGDOM_SET_BY_USER;
1601
1602 queue_regulatory_request(request);
1603
1604 return 0;
1605 }
1606
1607 /* Driver hints */
1608 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1609 {
1610 struct regulatory_request *request;
1611
1612 BUG_ON(!alpha2);
1613 BUG_ON(!wiphy);
1614
1615 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1616 if (!request)
1617 return -ENOMEM;
1618
1619 request->wiphy_idx = get_wiphy_idx(wiphy);
1620
1621 /* Must have registered wiphy first */
1622 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1623
1624 request->alpha2[0] = alpha2[0];
1625 request->alpha2[1] = alpha2[1];
1626 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
1627
1628 queue_regulatory_request(request);
1629
1630 return 0;
1631 }
1632 EXPORT_SYMBOL(regulatory_hint);
1633
1634 /*
1635 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1636 * therefore cannot iterate over the rdev list here.
1637 */
1638 void regulatory_hint_11d(struct wiphy *wiphy,
1639 enum ieee80211_band band,
1640 u8 *country_ie,
1641 u8 country_ie_len)
1642 {
1643 char alpha2[2];
1644 enum environment_cap env = ENVIRON_ANY;
1645 struct regulatory_request *request;
1646
1647 mutex_lock(&reg_mutex);
1648
1649 if (unlikely(!last_request))
1650 goto out;
1651
1652 /* IE len must be evenly divisible by 2 */
1653 if (country_ie_len & 0x01)
1654 goto out;
1655
1656 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1657 goto out;
1658
1659 alpha2[0] = country_ie[0];
1660 alpha2[1] = country_ie[1];
1661
1662 if (country_ie[2] == 'I')
1663 env = ENVIRON_INDOOR;
1664 else if (country_ie[2] == 'O')
1665 env = ENVIRON_OUTDOOR;
1666
1667 /*
1668 * We will run this only upon a successful connection on cfg80211.
1669 * We leave conflict resolution to the workqueue, where can hold
1670 * cfg80211_mutex.
1671 */
1672 if (likely(last_request->initiator ==
1673 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1674 wiphy_idx_valid(last_request->wiphy_idx)))
1675 goto out;
1676
1677 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1678 if (!request)
1679 goto out;
1680
1681 request->wiphy_idx = get_wiphy_idx(wiphy);
1682 request->alpha2[0] = alpha2[0];
1683 request->alpha2[1] = alpha2[1];
1684 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
1685 request->country_ie_env = env;
1686
1687 mutex_unlock(&reg_mutex);
1688
1689 queue_regulatory_request(request);
1690
1691 return;
1692
1693 out:
1694 mutex_unlock(&reg_mutex);
1695 }
1696
1697 static void restore_alpha2(char *alpha2, bool reset_user)
1698 {
1699 /* indicates there is no alpha2 to consider for restoration */
1700 alpha2[0] = '9';
1701 alpha2[1] = '7';
1702
1703 /* The user setting has precedence over the module parameter */
1704 if (is_user_regdom_saved()) {
1705 /* Unless we're asked to ignore it and reset it */
1706 if (reset_user) {
1707 REG_DBG_PRINT("Restoring regulatory settings "
1708 "including user preference\n");
1709 user_alpha2[0] = '9';
1710 user_alpha2[1] = '7';
1711
1712 /*
1713 * If we're ignoring user settings, we still need to
1714 * check the module parameter to ensure we put things
1715 * back as they were for a full restore.
1716 */
1717 if (!is_world_regdom(ieee80211_regdom)) {
1718 REG_DBG_PRINT("Keeping preference on "
1719 "module parameter ieee80211_regdom: %c%c\n",
1720 ieee80211_regdom[0],
1721 ieee80211_regdom[1]);
1722 alpha2[0] = ieee80211_regdom[0];
1723 alpha2[1] = ieee80211_regdom[1];
1724 }
1725 } else {
1726 REG_DBG_PRINT("Restoring regulatory settings "
1727 "while preserving user preference for: %c%c\n",
1728 user_alpha2[0],
1729 user_alpha2[1]);
1730 alpha2[0] = user_alpha2[0];
1731 alpha2[1] = user_alpha2[1];
1732 }
1733 } else if (!is_world_regdom(ieee80211_regdom)) {
1734 REG_DBG_PRINT("Keeping preference on "
1735 "module parameter ieee80211_regdom: %c%c\n",
1736 ieee80211_regdom[0],
1737 ieee80211_regdom[1]);
1738 alpha2[0] = ieee80211_regdom[0];
1739 alpha2[1] = ieee80211_regdom[1];
1740 } else
1741 REG_DBG_PRINT("Restoring regulatory settings\n");
1742 }
1743
1744 /*
1745 * Restoring regulatory settings involves ingoring any
1746 * possibly stale country IE information and user regulatory
1747 * settings if so desired, this includes any beacon hints
1748 * learned as we could have traveled outside to another country
1749 * after disconnection. To restore regulatory settings we do
1750 * exactly what we did at bootup:
1751 *
1752 * - send a core regulatory hint
1753 * - send a user regulatory hint if applicable
1754 *
1755 * Device drivers that send a regulatory hint for a specific country
1756 * keep their own regulatory domain on wiphy->regd so that does does
1757 * not need to be remembered.
1758 */
1759 static void restore_regulatory_settings(bool reset_user)
1760 {
1761 char alpha2[2];
1762 struct reg_beacon *reg_beacon, *btmp;
1763 struct regulatory_request *reg_request, *tmp;
1764 LIST_HEAD(tmp_reg_req_list);
1765
1766 mutex_lock(&cfg80211_mutex);
1767 mutex_lock(&reg_mutex);
1768
1769 reset_regdomains();
1770 restore_alpha2(alpha2, reset_user);
1771
1772 /*
1773 * If there's any pending requests we simply
1774 * stash them to a temporary pending queue and
1775 * add then after we've restored regulatory
1776 * settings.
1777 */
1778 spin_lock(&reg_requests_lock);
1779 if (!list_empty(&reg_requests_list)) {
1780 list_for_each_entry_safe(reg_request, tmp,
1781 &reg_requests_list, list) {
1782 if (reg_request->initiator !=
1783 NL80211_REGDOM_SET_BY_USER)
1784 continue;
1785 list_del(&reg_request->list);
1786 list_add_tail(&reg_request->list, &tmp_reg_req_list);
1787 }
1788 }
1789 spin_unlock(&reg_requests_lock);
1790
1791 /* Clear beacon hints */
1792 spin_lock_bh(&reg_pending_beacons_lock);
1793 if (!list_empty(&reg_pending_beacons)) {
1794 list_for_each_entry_safe(reg_beacon, btmp,
1795 &reg_pending_beacons, list) {
1796 list_del(&reg_beacon->list);
1797 kfree(reg_beacon);
1798 }
1799 }
1800 spin_unlock_bh(&reg_pending_beacons_lock);
1801
1802 if (!list_empty(&reg_beacon_list)) {
1803 list_for_each_entry_safe(reg_beacon, btmp,
1804 &reg_beacon_list, list) {
1805 list_del(&reg_beacon->list);
1806 kfree(reg_beacon);
1807 }
1808 }
1809
1810 /* First restore to the basic regulatory settings */
1811 cfg80211_regdomain = cfg80211_world_regdom;
1812
1813 mutex_unlock(&reg_mutex);
1814 mutex_unlock(&cfg80211_mutex);
1815
1816 regulatory_hint_core(cfg80211_regdomain->alpha2);
1817
1818 /*
1819 * This restores the ieee80211_regdom module parameter
1820 * preference or the last user requested regulatory
1821 * settings, user regulatory settings takes precedence.
1822 */
1823 if (is_an_alpha2(alpha2))
1824 regulatory_hint_user(user_alpha2);
1825
1826 if (list_empty(&tmp_reg_req_list))
1827 return;
1828
1829 mutex_lock(&cfg80211_mutex);
1830 mutex_lock(&reg_mutex);
1831
1832 spin_lock(&reg_requests_lock);
1833 list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) {
1834 REG_DBG_PRINT("Adding request for country %c%c back "
1835 "into the queue\n",
1836 reg_request->alpha2[0],
1837 reg_request->alpha2[1]);
1838 list_del(&reg_request->list);
1839 list_add_tail(&reg_request->list, &reg_requests_list);
1840 }
1841 spin_unlock(&reg_requests_lock);
1842
1843 mutex_unlock(&reg_mutex);
1844 mutex_unlock(&cfg80211_mutex);
1845
1846 REG_DBG_PRINT("Kicking the queue\n");
1847
1848 schedule_work(&reg_work);
1849 }
1850
1851 void regulatory_hint_disconnect(void)
1852 {
1853 REG_DBG_PRINT("All devices are disconnected, going to "
1854 "restore regulatory settings\n");
1855 restore_regulatory_settings(false);
1856 }
1857
1858 static bool freq_is_chan_12_13_14(u16 freq)
1859 {
1860 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
1861 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
1862 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
1863 return true;
1864 return false;
1865 }
1866
1867 int regulatory_hint_found_beacon(struct wiphy *wiphy,
1868 struct ieee80211_channel *beacon_chan,
1869 gfp_t gfp)
1870 {
1871 struct reg_beacon *reg_beacon;
1872
1873 if (likely((beacon_chan->beacon_found ||
1874 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1875 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1876 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1877 return 0;
1878
1879 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1880 if (!reg_beacon)
1881 return -ENOMEM;
1882
1883 REG_DBG_PRINT("Found new beacon on "
1884 "frequency: %d MHz (Ch %d) on %s\n",
1885 beacon_chan->center_freq,
1886 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1887 wiphy_name(wiphy));
1888
1889 memcpy(&reg_beacon->chan, beacon_chan,
1890 sizeof(struct ieee80211_channel));
1891
1892
1893 /*
1894 * Since we can be called from BH or and non-BH context
1895 * we must use spin_lock_bh()
1896 */
1897 spin_lock_bh(&reg_pending_beacons_lock);
1898 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1899 spin_unlock_bh(&reg_pending_beacons_lock);
1900
1901 schedule_work(&reg_work);
1902
1903 return 0;
1904 }
1905
1906 static void print_rd_rules(const struct ieee80211_regdomain *rd)
1907 {
1908 unsigned int i;
1909 const struct ieee80211_reg_rule *reg_rule = NULL;
1910 const struct ieee80211_freq_range *freq_range = NULL;
1911 const struct ieee80211_power_rule *power_rule = NULL;
1912
1913 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
1914
1915 for (i = 0; i < rd->n_reg_rules; i++) {
1916 reg_rule = &rd->reg_rules[i];
1917 freq_range = &reg_rule->freq_range;
1918 power_rule = &reg_rule->power_rule;
1919
1920 /*
1921 * There may not be documentation for max antenna gain
1922 * in certain regions
1923 */
1924 if (power_rule->max_antenna_gain)
1925 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
1926 freq_range->start_freq_khz,
1927 freq_range->end_freq_khz,
1928 freq_range->max_bandwidth_khz,
1929 power_rule->max_antenna_gain,
1930 power_rule->max_eirp);
1931 else
1932 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
1933 freq_range->start_freq_khz,
1934 freq_range->end_freq_khz,
1935 freq_range->max_bandwidth_khz,
1936 power_rule->max_eirp);
1937 }
1938 }
1939
1940 static void print_regdomain(const struct ieee80211_regdomain *rd)
1941 {
1942
1943 if (is_intersected_alpha2(rd->alpha2)) {
1944
1945 if (last_request->initiator ==
1946 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
1947 struct cfg80211_registered_device *rdev;
1948 rdev = cfg80211_rdev_by_wiphy_idx(
1949 last_request->wiphy_idx);
1950 if (rdev) {
1951 pr_info("Current regulatory domain updated by AP to: %c%c\n",
1952 rdev->country_ie_alpha2[0],
1953 rdev->country_ie_alpha2[1]);
1954 } else
1955 pr_info("Current regulatory domain intersected:\n");
1956 } else
1957 pr_info("Current regulatory domain intersected:\n");
1958 } else if (is_world_regdom(rd->alpha2))
1959 pr_info("World regulatory domain updated:\n");
1960 else {
1961 if (is_unknown_alpha2(rd->alpha2))
1962 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
1963 else
1964 pr_info("Regulatory domain changed to country: %c%c\n",
1965 rd->alpha2[0], rd->alpha2[1]);
1966 }
1967 print_rd_rules(rd);
1968 }
1969
1970 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1971 {
1972 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
1973 print_rd_rules(rd);
1974 }
1975
1976 /* Takes ownership of rd only if it doesn't fail */
1977 static int __set_regdom(const struct ieee80211_regdomain *rd)
1978 {
1979 const struct ieee80211_regdomain *intersected_rd = NULL;
1980 struct cfg80211_registered_device *rdev = NULL;
1981 struct wiphy *request_wiphy;
1982 /* Some basic sanity checks first */
1983
1984 if (is_world_regdom(rd->alpha2)) {
1985 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1986 return -EINVAL;
1987 update_world_regdomain(rd);
1988 return 0;
1989 }
1990
1991 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1992 !is_unknown_alpha2(rd->alpha2))
1993 return -EINVAL;
1994
1995 if (!last_request)
1996 return -EINVAL;
1997
1998 /*
1999 * Lets only bother proceeding on the same alpha2 if the current
2000 * rd is non static (it means CRDA was present and was used last)
2001 * and the pending request came in from a country IE
2002 */
2003 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2004 /*
2005 * If someone else asked us to change the rd lets only bother
2006 * checking if the alpha2 changes if CRDA was already called
2007 */
2008 if (!regdom_changes(rd->alpha2))
2009 return -EINVAL;
2010 }
2011
2012 /*
2013 * Now lets set the regulatory domain, update all driver channels
2014 * and finally inform them of what we have done, in case they want
2015 * to review or adjust their own settings based on their own
2016 * internal EEPROM data
2017 */
2018
2019 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
2020 return -EINVAL;
2021
2022 if (!is_valid_rd(rd)) {
2023 pr_err("Invalid regulatory domain detected:\n");
2024 print_regdomain_info(rd);
2025 return -EINVAL;
2026 }
2027
2028 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2029
2030 if (!last_request->intersect) {
2031 int r;
2032
2033 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
2034 reset_regdomains();
2035 cfg80211_regdomain = rd;
2036 return 0;
2037 }
2038
2039 /*
2040 * For a driver hint, lets copy the regulatory domain the
2041 * driver wanted to the wiphy to deal with conflicts
2042 */
2043
2044 /*
2045 * Userspace could have sent two replies with only
2046 * one kernel request.
2047 */
2048 if (request_wiphy->regd)
2049 return -EALREADY;
2050
2051 r = reg_copy_regd(&request_wiphy->regd, rd);
2052 if (r)
2053 return r;
2054
2055 reset_regdomains();
2056 cfg80211_regdomain = rd;
2057 return 0;
2058 }
2059
2060 /* Intersection requires a bit more work */
2061
2062 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
2063
2064 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2065 if (!intersected_rd)
2066 return -EINVAL;
2067
2068 /*
2069 * We can trash what CRDA provided now.
2070 * However if a driver requested this specific regulatory
2071 * domain we keep it for its private use
2072 */
2073 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
2074 request_wiphy->regd = rd;
2075 else
2076 kfree(rd);
2077
2078 rd = NULL;
2079
2080 reset_regdomains();
2081 cfg80211_regdomain = intersected_rd;
2082
2083 return 0;
2084 }
2085
2086 if (!intersected_rd)
2087 return -EINVAL;
2088
2089 rdev = wiphy_to_dev(request_wiphy);
2090
2091 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2092 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2093 rdev->env = last_request->country_ie_env;
2094
2095 BUG_ON(intersected_rd == rd);
2096
2097 kfree(rd);
2098 rd = NULL;
2099
2100 reset_regdomains();
2101 cfg80211_regdomain = intersected_rd;
2102
2103 return 0;
2104 }
2105
2106
2107 /*
2108 * Use this call to set the current regulatory domain. Conflicts with
2109 * multiple drivers can be ironed out later. Caller must've already
2110 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2111 */
2112 int set_regdom(const struct ieee80211_regdomain *rd)
2113 {
2114 int r;
2115
2116 assert_cfg80211_lock();
2117
2118 mutex_lock(&reg_mutex);
2119
2120 /* Note that this doesn't update the wiphys, this is done below */
2121 r = __set_regdom(rd);
2122 if (r) {
2123 kfree(rd);
2124 mutex_unlock(&reg_mutex);
2125 return r;
2126 }
2127
2128 /* This would make this whole thing pointless */
2129 if (!last_request->intersect)
2130 BUG_ON(rd != cfg80211_regdomain);
2131
2132 /* update all wiphys now with the new established regulatory domain */
2133 update_all_wiphy_regulatory(last_request->initiator);
2134
2135 print_regdomain(cfg80211_regdomain);
2136
2137 nl80211_send_reg_change_event(last_request);
2138
2139 reg_set_request_processed();
2140
2141 mutex_unlock(&reg_mutex);
2142
2143 return r;
2144 }
2145
2146 #ifdef CONFIG_HOTPLUG
2147 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2148 {
2149 if (last_request && !last_request->processed) {
2150 if (add_uevent_var(env, "COUNTRY=%c%c",
2151 last_request->alpha2[0],
2152 last_request->alpha2[1]))
2153 return -ENOMEM;
2154 }
2155
2156 return 0;
2157 }
2158 #else
2159 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2160 {
2161 return -ENODEV;
2162 }
2163 #endif /* CONFIG_HOTPLUG */
2164
2165 /* Caller must hold cfg80211_mutex */
2166 void reg_device_remove(struct wiphy *wiphy)
2167 {
2168 struct wiphy *request_wiphy = NULL;
2169
2170 assert_cfg80211_lock();
2171
2172 mutex_lock(&reg_mutex);
2173
2174 kfree(wiphy->regd);
2175
2176 if (last_request)
2177 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2178
2179 if (!request_wiphy || request_wiphy != wiphy)
2180 goto out;
2181
2182 last_request->wiphy_idx = WIPHY_IDX_STALE;
2183 last_request->country_ie_env = ENVIRON_ANY;
2184 out:
2185 mutex_unlock(&reg_mutex);
2186 }
2187
2188 static void reg_timeout_work(struct work_struct *work)
2189 {
2190 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "
2191 "restoring regulatory settings");
2192 restore_regulatory_settings(true);
2193 }
2194
2195 int __init regulatory_init(void)
2196 {
2197 int err = 0;
2198
2199 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2200 if (IS_ERR(reg_pdev))
2201 return PTR_ERR(reg_pdev);
2202
2203 reg_pdev->dev.type = &reg_device_type;
2204
2205 spin_lock_init(&reg_requests_lock);
2206 spin_lock_init(&reg_pending_beacons_lock);
2207
2208 cfg80211_regdomain = cfg80211_world_regdom;
2209
2210 user_alpha2[0] = '9';
2211 user_alpha2[1] = '7';
2212
2213 /* We always try to get an update for the static regdomain */
2214 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
2215 if (err) {
2216 if (err == -ENOMEM)
2217 return err;
2218 /*
2219 * N.B. kobject_uevent_env() can fail mainly for when we're out
2220 * memory which is handled and propagated appropriately above
2221 * but it can also fail during a netlink_broadcast() or during
2222 * early boot for call_usermodehelper(). For now treat these
2223 * errors as non-fatal.
2224 */
2225 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2226 #ifdef CONFIG_CFG80211_REG_DEBUG
2227 /* We want to find out exactly why when debugging */
2228 WARN_ON(err);
2229 #endif
2230 }
2231
2232 /*
2233 * Finally, if the user set the module parameter treat it
2234 * as a user hint.
2235 */
2236 if (!is_world_regdom(ieee80211_regdom))
2237 regulatory_hint_user(ieee80211_regdom);
2238
2239 return 0;
2240 }
2241
2242 void /* __init_or_exit */ regulatory_exit(void)
2243 {
2244 struct regulatory_request *reg_request, *tmp;
2245 struct reg_beacon *reg_beacon, *btmp;
2246
2247 cancel_work_sync(&reg_work);
2248 cancel_delayed_work_sync(&reg_timeout);
2249
2250 mutex_lock(&cfg80211_mutex);
2251 mutex_lock(&reg_mutex);
2252
2253 reset_regdomains();
2254
2255 kfree(last_request);
2256
2257 platform_device_unregister(reg_pdev);
2258
2259 spin_lock_bh(&reg_pending_beacons_lock);
2260 if (!list_empty(&reg_pending_beacons)) {
2261 list_for_each_entry_safe(reg_beacon, btmp,
2262 &reg_pending_beacons, list) {
2263 list_del(&reg_beacon->list);
2264 kfree(reg_beacon);
2265 }
2266 }
2267 spin_unlock_bh(&reg_pending_beacons_lock);
2268
2269 if (!list_empty(&reg_beacon_list)) {
2270 list_for_each_entry_safe(reg_beacon, btmp,
2271 &reg_beacon_list, list) {
2272 list_del(&reg_beacon->list);
2273 kfree(reg_beacon);
2274 }
2275 }
2276
2277 spin_lock(&reg_requests_lock);
2278 if (!list_empty(&reg_requests_list)) {
2279 list_for_each_entry_safe(reg_request, tmp,
2280 &reg_requests_list, list) {
2281 list_del(&reg_request->list);
2282 kfree(reg_request);
2283 }
2284 }
2285 spin_unlock(&reg_requests_lock);
2286
2287 mutex_unlock(&reg_mutex);
2288 mutex_unlock(&cfg80211_mutex);
2289 }
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