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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 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com> | |
6 | * | |
7 | * Permission to use, copy, modify, and/or distribute this software for any | |
8 | * purpose with or without fee is hereby granted, provided that the above | |
9 | * copyright notice and this permission notice appear in all copies. | |
10 | * | |
11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
17 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
18 | */ | |
19 | ||
20 | ||
21 | /** | |
22 | * DOC: Wireless regulatory infrastructure | |
23 | * | |
24 | * The usual implementation is for a driver to read a device EEPROM to | |
25 | * determine which regulatory domain it should be operating under, then | |
26 | * looking up the allowable channels in a driver-local table and finally | |
27 | * registering those channels in the wiphy structure. | |
28 | * | |
29 | * Another set of compliance enforcement is for drivers to use their | |
30 | * own compliance limits which can be stored on the EEPROM. The host | |
31 | * driver or firmware may ensure these are used. | |
32 | * | |
33 | * In addition to all this we provide an extra layer of regulatory | |
34 | * conformance. For drivers which do not have any regulatory | |
35 | * information CRDA provides the complete regulatory solution. | |
36 | * For others it provides a community effort on further restrictions | |
37 | * to enhance compliance. | |
38 | * | |
39 | * Note: When number of rules --> infinity we will not be able to | |
40 | * index on alpha2 any more, instead we'll probably have to | |
41 | * rely on some SHA1 checksum of the regdomain for example. | |
42 | * | |
43 | */ | |
44 | ||
45 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
46 | ||
47 | #include <linux/kernel.h> | |
48 | #include <linux/export.h> | |
49 | #include <linux/slab.h> | |
50 | #include <linux/list.h> | |
51 | #include <linux/random.h> | |
52 | #include <linux/ctype.h> | |
53 | #include <linux/nl80211.h> | |
54 | #include <linux/platform_device.h> | |
55 | #include <linux/moduleparam.h> | |
56 | #include <net/cfg80211.h> | |
57 | #include "core.h" | |
58 | #include "reg.h" | |
59 | #include "regdb.h" | |
60 | #include "nl80211.h" | |
61 | ||
62 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
63 | #define REG_DBG_PRINT(format, args...) \ | |
64 | printk(KERN_DEBUG pr_fmt(format), ##args) | |
65 | #else | |
66 | #define REG_DBG_PRINT(args...) | |
67 | #endif | |
68 | ||
69 | static struct regulatory_request core_request_world = { | |
70 | .initiator = NL80211_REGDOM_SET_BY_CORE, | |
71 | .alpha2[0] = '0', | |
72 | .alpha2[1] = '0', | |
73 | .intersect = false, | |
74 | .processed = true, | |
75 | .country_ie_env = ENVIRON_ANY, | |
76 | }; | |
77 | ||
78 | /* Receipt of information from last regulatory request */ | |
79 | static struct regulatory_request *last_request = &core_request_world; | |
80 | ||
81 | /* To trigger userspace events */ | |
82 | static struct platform_device *reg_pdev; | |
83 | ||
84 | static struct device_type reg_device_type = { | |
85 | .uevent = reg_device_uevent, | |
86 | }; | |
87 | ||
88 | /* | |
89 | * Central wireless core regulatory domains, we only need two, | |
90 | * the current one and a world regulatory domain in case we have no | |
91 | * information to give us an alpha2 | |
92 | */ | |
93 | const struct ieee80211_regdomain *cfg80211_regdomain; | |
94 | ||
95 | /* | |
96 | * Protects static reg.c components: | |
97 | * - cfg80211_world_regdom | |
98 | * - cfg80211_regdom | |
99 | * - last_request | |
100 | * - reg_num_devs_support_basehint | |
101 | */ | |
102 | static DEFINE_MUTEX(reg_mutex); | |
103 | ||
104 | /* | |
105 | * Number of devices that registered to the core | |
106 | * that support cellular base station regulatory hints | |
107 | */ | |
108 | static int reg_num_devs_support_basehint; | |
109 | ||
110 | static inline void assert_reg_lock(void) | |
111 | { | |
112 | lockdep_assert_held(®_mutex); | |
113 | } | |
114 | ||
115 | /* Used to queue up regulatory hints */ | |
116 | static LIST_HEAD(reg_requests_list); | |
117 | static spinlock_t reg_requests_lock; | |
118 | ||
119 | /* Used to queue up beacon hints for review */ | |
120 | static LIST_HEAD(reg_pending_beacons); | |
121 | static spinlock_t reg_pending_beacons_lock; | |
122 | ||
123 | /* Used to keep track of processed beacon hints */ | |
124 | static LIST_HEAD(reg_beacon_list); | |
125 | ||
126 | struct reg_beacon { | |
127 | struct list_head list; | |
128 | struct ieee80211_channel chan; | |
129 | }; | |
130 | ||
131 | static void reg_todo(struct work_struct *work); | |
132 | static DECLARE_WORK(reg_work, reg_todo); | |
133 | ||
134 | static void reg_timeout_work(struct work_struct *work); | |
135 | static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work); | |
136 | ||
137 | /* We keep a static world regulatory domain in case of the absence of CRDA */ | |
138 | static const struct ieee80211_regdomain world_regdom = { | |
139 | .n_reg_rules = 6, | |
140 | .alpha2 = "00", | |
141 | .reg_rules = { | |
142 | /* IEEE 802.11b/g, channels 1..11 */ | |
143 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
144 | /* IEEE 802.11b/g, channels 12..13. No HT40 | |
145 | * channel fits here. */ | |
146 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
147 | NL80211_RRF_PASSIVE_SCAN | | |
148 | NL80211_RRF_NO_IBSS), | |
149 | /* IEEE 802.11 channel 14 - Only JP enables | |
150 | * this and for 802.11b only */ | |
151 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
152 | NL80211_RRF_PASSIVE_SCAN | | |
153 | NL80211_RRF_NO_IBSS | | |
154 | NL80211_RRF_NO_OFDM), | |
155 | /* IEEE 802.11a, channel 36..48 */ | |
156 | REG_RULE(5180-10, 5240+10, 40, 6, 20, | |
157 | NL80211_RRF_PASSIVE_SCAN | | |
158 | NL80211_RRF_NO_IBSS), | |
159 | ||
160 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
161 | ||
162 | /* IEEE 802.11a, channel 149..165 */ | |
163 | REG_RULE(5745-10, 5825+10, 40, 6, 20, | |
164 | NL80211_RRF_PASSIVE_SCAN | | |
165 | NL80211_RRF_NO_IBSS), | |
166 | ||
167 | /* IEEE 802.11ad (60gHz), channels 1..3 */ | |
168 | REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0), | |
169 | } | |
170 | }; | |
171 | ||
172 | static const struct ieee80211_regdomain *cfg80211_world_regdom = | |
173 | &world_regdom; | |
174 | ||
175 | static char *ieee80211_regdom = "00"; | |
176 | static char user_alpha2[2]; | |
177 | ||
178 | module_param(ieee80211_regdom, charp, 0444); | |
179 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
180 | ||
181 | static void reset_regdomains(bool full_reset) | |
182 | { | |
183 | /* avoid freeing static information or freeing something twice */ | |
184 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
185 | cfg80211_regdomain = NULL; | |
186 | if (cfg80211_world_regdom == &world_regdom) | |
187 | cfg80211_world_regdom = NULL; | |
188 | if (cfg80211_regdomain == &world_regdom) | |
189 | cfg80211_regdomain = NULL; | |
190 | ||
191 | kfree(cfg80211_regdomain); | |
192 | kfree(cfg80211_world_regdom); | |
193 | ||
194 | cfg80211_world_regdom = &world_regdom; | |
195 | cfg80211_regdomain = NULL; | |
196 | ||
197 | if (!full_reset) | |
198 | return; | |
199 | ||
200 | if (last_request != &core_request_world) | |
201 | kfree(last_request); | |
202 | last_request = &core_request_world; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Dynamic world regulatory domain requested by the wireless | |
207 | * core upon initialization | |
208 | */ | |
209 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) | |
210 | { | |
211 | BUG_ON(!last_request); | |
212 | ||
213 | reset_regdomains(false); | |
214 | ||
215 | cfg80211_world_regdom = rd; | |
216 | cfg80211_regdomain = rd; | |
217 | } | |
218 | ||
219 | bool is_world_regdom(const char *alpha2) | |
220 | { | |
221 | if (!alpha2) | |
222 | return false; | |
223 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
224 | return true; | |
225 | return false; | |
226 | } | |
227 | ||
228 | static bool is_alpha2_set(const char *alpha2) | |
229 | { | |
230 | if (!alpha2) | |
231 | return false; | |
232 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
233 | return true; | |
234 | return false; | |
235 | } | |
236 | ||
237 | static bool is_unknown_alpha2(const char *alpha2) | |
238 | { | |
239 | if (!alpha2) | |
240 | return false; | |
241 | /* | |
242 | * Special case where regulatory domain was built by driver | |
243 | * but a specific alpha2 cannot be determined | |
244 | */ | |
245 | if (alpha2[0] == '9' && alpha2[1] == '9') | |
246 | return true; | |
247 | return false; | |
248 | } | |
249 | ||
250 | static bool is_intersected_alpha2(const char *alpha2) | |
251 | { | |
252 | if (!alpha2) | |
253 | return false; | |
254 | /* | |
255 | * Special case where regulatory domain is the | |
256 | * result of an intersection between two regulatory domain | |
257 | * structures | |
258 | */ | |
259 | if (alpha2[0] == '9' && alpha2[1] == '8') | |
260 | return true; | |
261 | return false; | |
262 | } | |
263 | ||
264 | static bool is_an_alpha2(const char *alpha2) | |
265 | { | |
266 | if (!alpha2) | |
267 | return false; | |
268 | if (isalpha(alpha2[0]) && isalpha(alpha2[1])) | |
269 | return true; | |
270 | return false; | |
271 | } | |
272 | ||
273 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) | |
274 | { | |
275 | if (!alpha2_x || !alpha2_y) | |
276 | return false; | |
277 | if (alpha2_x[0] == alpha2_y[0] && | |
278 | alpha2_x[1] == alpha2_y[1]) | |
279 | return true; | |
280 | return false; | |
281 | } | |
282 | ||
283 | static bool regdom_changes(const char *alpha2) | |
284 | { | |
285 | assert_cfg80211_lock(); | |
286 | ||
287 | if (!cfg80211_regdomain) | |
288 | return true; | |
289 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
290 | return false; | |
291 | return true; | |
292 | } | |
293 | ||
294 | /* | |
295 | * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets | |
296 | * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER | |
297 | * has ever been issued. | |
298 | */ | |
299 | static bool is_user_regdom_saved(void) | |
300 | { | |
301 | if (user_alpha2[0] == '9' && user_alpha2[1] == '7') | |
302 | return false; | |
303 | ||
304 | /* This would indicate a mistake on the design */ | |
305 | if (WARN((!is_world_regdom(user_alpha2) && | |
306 | !is_an_alpha2(user_alpha2)), | |
307 | "Unexpected user alpha2: %c%c\n", | |
308 | user_alpha2[0], | |
309 | user_alpha2[1])) | |
310 | return false; | |
311 | ||
312 | return true; | |
313 | } | |
314 | ||
315 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, | |
316 | const struct ieee80211_regdomain *src_regd) | |
317 | { | |
318 | struct ieee80211_regdomain *regd; | |
319 | int size_of_regd = 0; | |
320 | unsigned int i; | |
321 | ||
322 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
323 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
324 | ||
325 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
326 | if (!regd) | |
327 | return -ENOMEM; | |
328 | ||
329 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
330 | ||
331 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
332 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
333 | sizeof(struct ieee80211_reg_rule)); | |
334 | ||
335 | *dst_regd = regd; | |
336 | return 0; | |
337 | } | |
338 | ||
339 | #ifdef CONFIG_CFG80211_INTERNAL_REGDB | |
340 | struct reg_regdb_search_request { | |
341 | char alpha2[2]; | |
342 | struct list_head list; | |
343 | }; | |
344 | ||
345 | static LIST_HEAD(reg_regdb_search_list); | |
346 | static DEFINE_MUTEX(reg_regdb_search_mutex); | |
347 | ||
348 | static void reg_regdb_search(struct work_struct *work) | |
349 | { | |
350 | struct reg_regdb_search_request *request; | |
351 | const struct ieee80211_regdomain *curdom, *regdom; | |
352 | int i, r; | |
353 | bool set_reg = false; | |
354 | ||
355 | mutex_lock(&cfg80211_mutex); | |
356 | ||
357 | mutex_lock(®_regdb_search_mutex); | |
358 | while (!list_empty(®_regdb_search_list)) { | |
359 | request = list_first_entry(®_regdb_search_list, | |
360 | struct reg_regdb_search_request, | |
361 | list); | |
362 | list_del(&request->list); | |
363 | ||
364 | for (i=0; i<reg_regdb_size; i++) { | |
365 | curdom = reg_regdb[i]; | |
366 | ||
367 | if (!memcmp(request->alpha2, curdom->alpha2, 2)) { | |
368 | r = reg_copy_regd(®dom, curdom); | |
369 | if (r) | |
370 | break; | |
371 | set_reg = true; | |
372 | break; | |
373 | } | |
374 | } | |
375 | ||
376 | kfree(request); | |
377 | } | |
378 | mutex_unlock(®_regdb_search_mutex); | |
379 | ||
380 | if (set_reg) | |
381 | set_regdom(regdom); | |
382 | ||
383 | mutex_unlock(&cfg80211_mutex); | |
384 | } | |
385 | ||
386 | static DECLARE_WORK(reg_regdb_work, reg_regdb_search); | |
387 | ||
388 | static void reg_regdb_query(const char *alpha2) | |
389 | { | |
390 | struct reg_regdb_search_request *request; | |
391 | ||
392 | if (!alpha2) | |
393 | return; | |
394 | ||
395 | request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL); | |
396 | if (!request) | |
397 | return; | |
398 | ||
399 | memcpy(request->alpha2, alpha2, 2); | |
400 | ||
401 | mutex_lock(®_regdb_search_mutex); | |
402 | list_add_tail(&request->list, ®_regdb_search_list); | |
403 | mutex_unlock(®_regdb_search_mutex); | |
404 | ||
405 | schedule_work(®_regdb_work); | |
406 | } | |
407 | ||
408 | /* Feel free to add any other sanity checks here */ | |
409 | static void reg_regdb_size_check(void) | |
410 | { | |
411 | /* We should ideally BUILD_BUG_ON() but then random builds would fail */ | |
412 | WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it..."); | |
413 | } | |
414 | #else | |
415 | static inline void reg_regdb_size_check(void) {} | |
416 | static inline void reg_regdb_query(const char *alpha2) {} | |
417 | #endif /* CONFIG_CFG80211_INTERNAL_REGDB */ | |
418 | ||
419 | /* | |
420 | * This lets us keep regulatory code which is updated on a regulatory | |
421 | * basis in userspace. Country information is filled in by | |
422 | * reg_device_uevent | |
423 | */ | |
424 | static int call_crda(const char *alpha2) | |
425 | { | |
426 | if (!is_world_regdom((char *) alpha2)) | |
427 | pr_info("Calling CRDA for country: %c%c\n", | |
428 | alpha2[0], alpha2[1]); | |
429 | else | |
430 | pr_info("Calling CRDA to update world regulatory domain\n"); | |
431 | ||
432 | /* query internal regulatory database (if it exists) */ | |
433 | reg_regdb_query(alpha2); | |
434 | ||
435 | return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE); | |
436 | } | |
437 | ||
438 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ | |
439 | bool reg_is_valid_request(const char *alpha2) | |
440 | { | |
441 | assert_cfg80211_lock(); | |
442 | ||
443 | if (!last_request) | |
444 | return false; | |
445 | ||
446 | return alpha2_equal(last_request->alpha2, alpha2); | |
447 | } | |
448 | ||
449 | /* Sanity check on a regulatory rule */ | |
450 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) | |
451 | { | |
452 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; | |
453 | u32 freq_diff; | |
454 | ||
455 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) | |
456 | return false; | |
457 | ||
458 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
459 | return false; | |
460 | ||
461 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
462 | ||
463 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || | |
464 | freq_range->max_bandwidth_khz > freq_diff) | |
465 | return false; | |
466 | ||
467 | return true; | |
468 | } | |
469 | ||
470 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) | |
471 | { | |
472 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
473 | unsigned int i; | |
474 | ||
475 | if (!rd->n_reg_rules) | |
476 | return false; | |
477 | ||
478 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) | |
479 | return false; | |
480 | ||
481 | for (i = 0; i < rd->n_reg_rules; i++) { | |
482 | reg_rule = &rd->reg_rules[i]; | |
483 | if (!is_valid_reg_rule(reg_rule)) | |
484 | return false; | |
485 | } | |
486 | ||
487 | return true; | |
488 | } | |
489 | ||
490 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, | |
491 | u32 center_freq_khz, | |
492 | u32 bw_khz) | |
493 | { | |
494 | u32 start_freq_khz, end_freq_khz; | |
495 | ||
496 | start_freq_khz = center_freq_khz - (bw_khz/2); | |
497 | end_freq_khz = center_freq_khz + (bw_khz/2); | |
498 | ||
499 | if (start_freq_khz >= freq_range->start_freq_khz && | |
500 | end_freq_khz <= freq_range->end_freq_khz) | |
501 | return true; | |
502 | ||
503 | return false; | |
504 | } | |
505 | ||
506 | /** | |
507 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
508 | * @freq_range: frequency rule we want to query | |
509 | * @freq_khz: frequency we are inquiring about | |
510 | * | |
511 | * This lets us know if a specific frequency rule is or is not relevant to | |
512 | * a specific frequency's band. Bands are device specific and artificial | |
513 | * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"), | |
514 | * however it is safe for now to assume that a frequency rule should not be | |
515 | * part of a frequency's band if the start freq or end freq are off by more | |
516 | * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the | |
517 | * 60 GHz band. | |
518 | * This resolution can be lowered and should be considered as we add | |
519 | * regulatory rule support for other "bands". | |
520 | **/ | |
521 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
522 | u32 freq_khz) | |
523 | { | |
524 | #define ONE_GHZ_IN_KHZ 1000000 | |
525 | /* | |
526 | * From 802.11ad: directional multi-gigabit (DMG): | |
527 | * Pertaining to operation in a frequency band containing a channel | |
528 | * with the Channel starting frequency above 45 GHz. | |
529 | */ | |
530 | u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ? | |
531 | 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ; | |
532 | if (abs(freq_khz - freq_range->start_freq_khz) <= limit) | |
533 | return true; | |
534 | if (abs(freq_khz - freq_range->end_freq_khz) <= limit) | |
535 | return true; | |
536 | return false; | |
537 | #undef ONE_GHZ_IN_KHZ | |
538 | } | |
539 | ||
540 | /* | |
541 | * Helper for regdom_intersect(), this does the real | |
542 | * mathematical intersection fun | |
543 | */ | |
544 | static int reg_rules_intersect( | |
545 | const struct ieee80211_reg_rule *rule1, | |
546 | const struct ieee80211_reg_rule *rule2, | |
547 | struct ieee80211_reg_rule *intersected_rule) | |
548 | { | |
549 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
550 | struct ieee80211_freq_range *freq_range; | |
551 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
552 | struct ieee80211_power_rule *power_rule; | |
553 | u32 freq_diff; | |
554 | ||
555 | freq_range1 = &rule1->freq_range; | |
556 | freq_range2 = &rule2->freq_range; | |
557 | freq_range = &intersected_rule->freq_range; | |
558 | ||
559 | power_rule1 = &rule1->power_rule; | |
560 | power_rule2 = &rule2->power_rule; | |
561 | power_rule = &intersected_rule->power_rule; | |
562 | ||
563 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
564 | freq_range2->start_freq_khz); | |
565 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
566 | freq_range2->end_freq_khz); | |
567 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
568 | freq_range2->max_bandwidth_khz); | |
569 | ||
570 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
571 | if (freq_range->max_bandwidth_khz > freq_diff) | |
572 | freq_range->max_bandwidth_khz = freq_diff; | |
573 | ||
574 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
575 | power_rule2->max_eirp); | |
576 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
577 | power_rule2->max_antenna_gain); | |
578 | ||
579 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
580 | ||
581 | if (!is_valid_reg_rule(intersected_rule)) | |
582 | return -EINVAL; | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | /** | |
588 | * regdom_intersect - do the intersection between two regulatory domains | |
589 | * @rd1: first regulatory domain | |
590 | * @rd2: second regulatory domain | |
591 | * | |
592 | * Use this function to get the intersection between two regulatory domains. | |
593 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
594 | * as no one single alpha2 can represent this regulatory domain. | |
595 | * | |
596 | * Returns a pointer to the regulatory domain structure which will hold the | |
597 | * resulting intersection of rules between rd1 and rd2. We will | |
598 | * kzalloc() this structure for you. | |
599 | */ | |
600 | static struct ieee80211_regdomain *regdom_intersect( | |
601 | const struct ieee80211_regdomain *rd1, | |
602 | const struct ieee80211_regdomain *rd2) | |
603 | { | |
604 | int r, size_of_regd; | |
605 | unsigned int x, y; | |
606 | unsigned int num_rules = 0, rule_idx = 0; | |
607 | const struct ieee80211_reg_rule *rule1, *rule2; | |
608 | struct ieee80211_reg_rule *intersected_rule; | |
609 | struct ieee80211_regdomain *rd; | |
610 | /* This is just a dummy holder to help us count */ | |
611 | struct ieee80211_reg_rule irule; | |
612 | ||
613 | /* Uses the stack temporarily for counter arithmetic */ | |
614 | intersected_rule = &irule; | |
615 | ||
616 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
617 | ||
618 | if (!rd1 || !rd2) | |
619 | return NULL; | |
620 | ||
621 | /* | |
622 | * First we get a count of the rules we'll need, then we actually | |
623 | * build them. This is to so we can malloc() and free() a | |
624 | * regdomain once. The reason we use reg_rules_intersect() here | |
625 | * is it will return -EINVAL if the rule computed makes no sense. | |
626 | * All rules that do check out OK are valid. | |
627 | */ | |
628 | ||
629 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
630 | rule1 = &rd1->reg_rules[x]; | |
631 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
632 | rule2 = &rd2->reg_rules[y]; | |
633 | if (!reg_rules_intersect(rule1, rule2, | |
634 | intersected_rule)) | |
635 | num_rules++; | |
636 | memset(intersected_rule, 0, | |
637 | sizeof(struct ieee80211_reg_rule)); | |
638 | } | |
639 | } | |
640 | ||
641 | if (!num_rules) | |
642 | return NULL; | |
643 | ||
644 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
645 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
646 | ||
647 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
648 | if (!rd) | |
649 | return NULL; | |
650 | ||
651 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
652 | rule1 = &rd1->reg_rules[x]; | |
653 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
654 | rule2 = &rd2->reg_rules[y]; | |
655 | /* | |
656 | * This time around instead of using the stack lets | |
657 | * write to the target rule directly saving ourselves | |
658 | * a memcpy() | |
659 | */ | |
660 | intersected_rule = &rd->reg_rules[rule_idx]; | |
661 | r = reg_rules_intersect(rule1, rule2, | |
662 | intersected_rule); | |
663 | /* | |
664 | * No need to memset here the intersected rule here as | |
665 | * we're not using the stack anymore | |
666 | */ | |
667 | if (r) | |
668 | continue; | |
669 | rule_idx++; | |
670 | } | |
671 | } | |
672 | ||
673 | if (rule_idx != num_rules) { | |
674 | kfree(rd); | |
675 | return NULL; | |
676 | } | |
677 | ||
678 | rd->n_reg_rules = num_rules; | |
679 | rd->alpha2[0] = '9'; | |
680 | rd->alpha2[1] = '8'; | |
681 | ||
682 | return rd; | |
683 | } | |
684 | ||
685 | /* | |
686 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
687 | * want to just have the channel structure use these | |
688 | */ | |
689 | static u32 map_regdom_flags(u32 rd_flags) | |
690 | { | |
691 | u32 channel_flags = 0; | |
692 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
693 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
694 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
695 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
696 | if (rd_flags & NL80211_RRF_DFS) | |
697 | channel_flags |= IEEE80211_CHAN_RADAR; | |
698 | if (rd_flags & NL80211_RRF_NO_OFDM) | |
699 | channel_flags |= IEEE80211_CHAN_NO_OFDM; | |
700 | return channel_flags; | |
701 | } | |
702 | ||
703 | static int freq_reg_info_regd(struct wiphy *wiphy, | |
704 | u32 center_freq, | |
705 | u32 desired_bw_khz, | |
706 | const struct ieee80211_reg_rule **reg_rule, | |
707 | const struct ieee80211_regdomain *custom_regd) | |
708 | { | |
709 | int i; | |
710 | bool band_rule_found = false; | |
711 | const struct ieee80211_regdomain *regd; | |
712 | bool bw_fits = false; | |
713 | ||
714 | if (!desired_bw_khz) | |
715 | desired_bw_khz = MHZ_TO_KHZ(20); | |
716 | ||
717 | regd = custom_regd ? custom_regd : cfg80211_regdomain; | |
718 | ||
719 | /* | |
720 | * Follow the driver's regulatory domain, if present, unless a country | |
721 | * IE has been processed or a user wants to help complaince further | |
722 | */ | |
723 | if (!custom_regd && | |
724 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
725 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && | |
726 | wiphy->regd) | |
727 | regd = wiphy->regd; | |
728 | ||
729 | if (!regd) | |
730 | return -EINVAL; | |
731 | ||
732 | for (i = 0; i < regd->n_reg_rules; i++) { | |
733 | const struct ieee80211_reg_rule *rr; | |
734 | const struct ieee80211_freq_range *fr = NULL; | |
735 | ||
736 | rr = ®d->reg_rules[i]; | |
737 | fr = &rr->freq_range; | |
738 | ||
739 | /* | |
740 | * We only need to know if one frequency rule was | |
741 | * was in center_freq's band, that's enough, so lets | |
742 | * not overwrite it once found | |
743 | */ | |
744 | if (!band_rule_found) | |
745 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
746 | ||
747 | bw_fits = reg_does_bw_fit(fr, | |
748 | center_freq, | |
749 | desired_bw_khz); | |
750 | ||
751 | if (band_rule_found && bw_fits) { | |
752 | *reg_rule = rr; | |
753 | return 0; | |
754 | } | |
755 | } | |
756 | ||
757 | if (!band_rule_found) | |
758 | return -ERANGE; | |
759 | ||
760 | return -EINVAL; | |
761 | } | |
762 | ||
763 | int freq_reg_info(struct wiphy *wiphy, | |
764 | u32 center_freq, | |
765 | u32 desired_bw_khz, | |
766 | const struct ieee80211_reg_rule **reg_rule) | |
767 | { | |
768 | assert_cfg80211_lock(); | |
769 | return freq_reg_info_regd(wiphy, | |
770 | center_freq, | |
771 | desired_bw_khz, | |
772 | reg_rule, | |
773 | NULL); | |
774 | } | |
775 | EXPORT_SYMBOL(freq_reg_info); | |
776 | ||
777 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
778 | static const char *reg_initiator_name(enum nl80211_reg_initiator initiator) | |
779 | { | |
780 | switch (initiator) { | |
781 | case NL80211_REGDOM_SET_BY_CORE: | |
782 | return "Set by core"; | |
783 | case NL80211_REGDOM_SET_BY_USER: | |
784 | return "Set by user"; | |
785 | case NL80211_REGDOM_SET_BY_DRIVER: | |
786 | return "Set by driver"; | |
787 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
788 | return "Set by country IE"; | |
789 | default: | |
790 | WARN_ON(1); | |
791 | return "Set by bug"; | |
792 | } | |
793 | } | |
794 | ||
795 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, | |
796 | u32 desired_bw_khz, | |
797 | const struct ieee80211_reg_rule *reg_rule) | |
798 | { | |
799 | const struct ieee80211_power_rule *power_rule; | |
800 | const struct ieee80211_freq_range *freq_range; | |
801 | char max_antenna_gain[32]; | |
802 | ||
803 | power_rule = ®_rule->power_rule; | |
804 | freq_range = ®_rule->freq_range; | |
805 | ||
806 | if (!power_rule->max_antenna_gain) | |
807 | snprintf(max_antenna_gain, 32, "N/A"); | |
808 | else | |
809 | snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain); | |
810 | ||
811 | REG_DBG_PRINT("Updating information on frequency %d MHz " | |
812 | "for a %d MHz width channel with regulatory rule:\n", | |
813 | chan->center_freq, | |
814 | KHZ_TO_MHZ(desired_bw_khz)); | |
815 | ||
816 | REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n", | |
817 | freq_range->start_freq_khz, | |
818 | freq_range->end_freq_khz, | |
819 | freq_range->max_bandwidth_khz, | |
820 | max_antenna_gain, | |
821 | power_rule->max_eirp); | |
822 | } | |
823 | #else | |
824 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, | |
825 | u32 desired_bw_khz, | |
826 | const struct ieee80211_reg_rule *reg_rule) | |
827 | { | |
828 | return; | |
829 | } | |
830 | #endif | |
831 | ||
832 | /* | |
833 | * Note that right now we assume the desired channel bandwidth | |
834 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz | |
835 | * per channel, the primary and the extension channel). To support | |
836 | * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a | |
837 | * new ieee80211_channel.target_bw and re run the regulatory check | |
838 | * on the wiphy with the target_bw specified. Then we can simply use | |
839 | * that below for the desired_bw_khz below. | |
840 | */ | |
841 | static void handle_channel(struct wiphy *wiphy, | |
842 | enum nl80211_reg_initiator initiator, | |
843 | enum ieee80211_band band, | |
844 | unsigned int chan_idx) | |
845 | { | |
846 | int r; | |
847 | u32 flags, bw_flags = 0; | |
848 | u32 desired_bw_khz = MHZ_TO_KHZ(20); | |
849 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
850 | const struct ieee80211_power_rule *power_rule = NULL; | |
851 | const struct ieee80211_freq_range *freq_range = NULL; | |
852 | struct ieee80211_supported_band *sband; | |
853 | struct ieee80211_channel *chan; | |
854 | struct wiphy *request_wiphy = NULL; | |
855 | ||
856 | assert_cfg80211_lock(); | |
857 | ||
858 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
859 | ||
860 | sband = wiphy->bands[band]; | |
861 | BUG_ON(chan_idx >= sband->n_channels); | |
862 | chan = &sband->channels[chan_idx]; | |
863 | ||
864 | flags = chan->orig_flags; | |
865 | ||
866 | r = freq_reg_info(wiphy, | |
867 | MHZ_TO_KHZ(chan->center_freq), | |
868 | desired_bw_khz, | |
869 | ®_rule); | |
870 | ||
871 | if (r) { | |
872 | /* | |
873 | * We will disable all channels that do not match our | |
874 | * received regulatory rule unless the hint is coming | |
875 | * from a Country IE and the Country IE had no information | |
876 | * about a band. The IEEE 802.11 spec allows for an AP | |
877 | * to send only a subset of the regulatory rules allowed, | |
878 | * so an AP in the US that only supports 2.4 GHz may only send | |
879 | * a country IE with information for the 2.4 GHz band | |
880 | * while 5 GHz is still supported. | |
881 | */ | |
882 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
883 | r == -ERANGE) | |
884 | return; | |
885 | ||
886 | REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq); | |
887 | chan->flags = IEEE80211_CHAN_DISABLED; | |
888 | return; | |
889 | } | |
890 | ||
891 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); | |
892 | ||
893 | power_rule = ®_rule->power_rule; | |
894 | freq_range = ®_rule->freq_range; | |
895 | ||
896 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
897 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
898 | ||
899 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && | |
900 | request_wiphy && request_wiphy == wiphy && | |
901 | request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { | |
902 | /* | |
903 | * This guarantees the driver's requested regulatory domain | |
904 | * will always be used as a base for further regulatory | |
905 | * settings | |
906 | */ | |
907 | chan->flags = chan->orig_flags = | |
908 | map_regdom_flags(reg_rule->flags) | bw_flags; | |
909 | chan->max_antenna_gain = chan->orig_mag = | |
910 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
911 | chan->max_power = chan->orig_mpwr = | |
912 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
913 | return; | |
914 | } | |
915 | ||
916 | chan->beacon_found = false; | |
917 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); | |
918 | chan->max_antenna_gain = min(chan->orig_mag, | |
919 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); | |
920 | chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
921 | if (chan->orig_mpwr) { | |
922 | /* | |
923 | * Devices that have their own custom regulatory domain | |
924 | * but also use WIPHY_FLAG_STRICT_REGULATORY will follow the | |
925 | * passed country IE power settings. | |
926 | */ | |
927 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
928 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY && | |
929 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) | |
930 | chan->max_power = chan->max_reg_power; | |
931 | else | |
932 | chan->max_power = min(chan->orig_mpwr, | |
933 | chan->max_reg_power); | |
934 | } else | |
935 | chan->max_power = chan->max_reg_power; | |
936 | } | |
937 | ||
938 | static void handle_band(struct wiphy *wiphy, | |
939 | enum ieee80211_band band, | |
940 | enum nl80211_reg_initiator initiator) | |
941 | { | |
942 | unsigned int i; | |
943 | struct ieee80211_supported_band *sband; | |
944 | ||
945 | BUG_ON(!wiphy->bands[band]); | |
946 | sband = wiphy->bands[band]; | |
947 | ||
948 | for (i = 0; i < sband->n_channels; i++) | |
949 | handle_channel(wiphy, initiator, band, i); | |
950 | } | |
951 | ||
952 | static bool reg_request_cell_base(struct regulatory_request *request) | |
953 | { | |
954 | if (request->initiator != NL80211_REGDOM_SET_BY_USER) | |
955 | return false; | |
956 | if (request->user_reg_hint_type != NL80211_USER_REG_HINT_CELL_BASE) | |
957 | return false; | |
958 | return true; | |
959 | } | |
960 | ||
961 | bool reg_last_request_cell_base(void) | |
962 | { | |
963 | bool val; | |
964 | assert_cfg80211_lock(); | |
965 | ||
966 | mutex_lock(®_mutex); | |
967 | val = reg_request_cell_base(last_request); | |
968 | mutex_unlock(®_mutex); | |
969 | return val; | |
970 | } | |
971 | ||
972 | #ifdef CONFIG_CFG80211_CERTIFICATION_ONUS | |
973 | ||
974 | /* Core specific check */ | |
975 | static int reg_ignore_cell_hint(struct regulatory_request *pending_request) | |
976 | { | |
977 | if (!reg_num_devs_support_basehint) | |
978 | return -EOPNOTSUPP; | |
979 | ||
980 | if (reg_request_cell_base(last_request)) { | |
981 | if (!regdom_changes(pending_request->alpha2)) | |
982 | return -EALREADY; | |
983 | return 0; | |
984 | } | |
985 | return 0; | |
986 | } | |
987 | ||
988 | /* Device specific check */ | |
989 | static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy) | |
990 | { | |
991 | if (!(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS)) | |
992 | return true; | |
993 | return false; | |
994 | } | |
995 | #else | |
996 | static int reg_ignore_cell_hint(struct regulatory_request *pending_request) | |
997 | { | |
998 | return -EOPNOTSUPP; | |
999 | } | |
1000 | static int reg_dev_ignore_cell_hint(struct wiphy *wiphy) | |
1001 | { | |
1002 | return true; | |
1003 | } | |
1004 | #endif | |
1005 | ||
1006 | ||
1007 | static bool ignore_reg_update(struct wiphy *wiphy, | |
1008 | enum nl80211_reg_initiator initiator) | |
1009 | { | |
1010 | if (!last_request) { | |
1011 | REG_DBG_PRINT("Ignoring regulatory request %s since " | |
1012 | "last_request is not set\n", | |
1013 | reg_initiator_name(initiator)); | |
1014 | return true; | |
1015 | } | |
1016 | ||
1017 | if (initiator == NL80211_REGDOM_SET_BY_CORE && | |
1018 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { | |
1019 | REG_DBG_PRINT("Ignoring regulatory request %s " | |
1020 | "since the driver uses its own custom " | |
1021 | "regulatory domain\n", | |
1022 | reg_initiator_name(initiator)); | |
1023 | return true; | |
1024 | } | |
1025 | ||
1026 | /* | |
1027 | * wiphy->regd will be set once the device has its own | |
1028 | * desired regulatory domain set | |
1029 | */ | |
1030 | if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && | |
1031 | initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1032 | !is_world_regdom(last_request->alpha2)) { | |
1033 | REG_DBG_PRINT("Ignoring regulatory request %s " | |
1034 | "since the driver requires its own regulatory " | |
1035 | "domain to be set first\n", | |
1036 | reg_initiator_name(initiator)); | |
1037 | return true; | |
1038 | } | |
1039 | ||
1040 | if (reg_request_cell_base(last_request)) | |
1041 | return reg_dev_ignore_cell_hint(wiphy); | |
1042 | ||
1043 | return false; | |
1044 | } | |
1045 | ||
1046 | static void handle_reg_beacon(struct wiphy *wiphy, | |
1047 | unsigned int chan_idx, | |
1048 | struct reg_beacon *reg_beacon) | |
1049 | { | |
1050 | struct ieee80211_supported_band *sband; | |
1051 | struct ieee80211_channel *chan; | |
1052 | bool channel_changed = false; | |
1053 | struct ieee80211_channel chan_before; | |
1054 | ||
1055 | assert_cfg80211_lock(); | |
1056 | ||
1057 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1058 | chan = &sband->channels[chan_idx]; | |
1059 | ||
1060 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
1061 | return; | |
1062 | ||
1063 | if (chan->beacon_found) | |
1064 | return; | |
1065 | ||
1066 | chan->beacon_found = true; | |
1067 | ||
1068 | if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) | |
1069 | return; | |
1070 | ||
1071 | chan_before.center_freq = chan->center_freq; | |
1072 | chan_before.flags = chan->flags; | |
1073 | ||
1074 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { | |
1075 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; | |
1076 | channel_changed = true; | |
1077 | } | |
1078 | ||
1079 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { | |
1080 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; | |
1081 | channel_changed = true; | |
1082 | } | |
1083 | ||
1084 | if (channel_changed) | |
1085 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * Called when a scan on a wiphy finds a beacon on | |
1090 | * new channel | |
1091 | */ | |
1092 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
1093 | struct reg_beacon *reg_beacon) | |
1094 | { | |
1095 | unsigned int i; | |
1096 | struct ieee80211_supported_band *sband; | |
1097 | ||
1098 | assert_cfg80211_lock(); | |
1099 | ||
1100 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1101 | return; | |
1102 | ||
1103 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1104 | ||
1105 | for (i = 0; i < sband->n_channels; i++) | |
1106 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * Called upon reg changes or a new wiphy is added | |
1111 | */ | |
1112 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1113 | { | |
1114 | unsigned int i; | |
1115 | struct ieee80211_supported_band *sband; | |
1116 | struct reg_beacon *reg_beacon; | |
1117 | ||
1118 | assert_cfg80211_lock(); | |
1119 | ||
1120 | if (list_empty(®_beacon_list)) | |
1121 | return; | |
1122 | ||
1123 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1124 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1125 | continue; | |
1126 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1127 | for (i = 0; i < sband->n_channels; i++) | |
1128 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1133 | { | |
1134 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1135 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1136 | return true; | |
1137 | if (last_request && | |
1138 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1139 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) | |
1140 | return true; | |
1141 | return false; | |
1142 | } | |
1143 | ||
1144 | /* Reap the advantages of previously found beacons */ | |
1145 | static void reg_process_beacons(struct wiphy *wiphy) | |
1146 | { | |
1147 | /* | |
1148 | * Means we are just firing up cfg80211, so no beacons would | |
1149 | * have been processed yet. | |
1150 | */ | |
1151 | if (!last_request) | |
1152 | return; | |
1153 | if (!reg_is_world_roaming(wiphy)) | |
1154 | return; | |
1155 | wiphy_update_beacon_reg(wiphy); | |
1156 | } | |
1157 | ||
1158 | static bool is_ht40_not_allowed(struct ieee80211_channel *chan) | |
1159 | { | |
1160 | if (!chan) | |
1161 | return true; | |
1162 | if (chan->flags & IEEE80211_CHAN_DISABLED) | |
1163 | return true; | |
1164 | /* This would happen when regulatory rules disallow HT40 completely */ | |
1165 | if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) | |
1166 | return true; | |
1167 | return false; | |
1168 | } | |
1169 | ||
1170 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, | |
1171 | enum ieee80211_band band, | |
1172 | unsigned int chan_idx) | |
1173 | { | |
1174 | struct ieee80211_supported_band *sband; | |
1175 | struct ieee80211_channel *channel; | |
1176 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; | |
1177 | unsigned int i; | |
1178 | ||
1179 | assert_cfg80211_lock(); | |
1180 | ||
1181 | sband = wiphy->bands[band]; | |
1182 | BUG_ON(chan_idx >= sband->n_channels); | |
1183 | channel = &sband->channels[chan_idx]; | |
1184 | ||
1185 | if (is_ht40_not_allowed(channel)) { | |
1186 | channel->flags |= IEEE80211_CHAN_NO_HT40; | |
1187 | return; | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * We need to ensure the extension channels exist to | |
1192 | * be able to use HT40- or HT40+, this finds them (or not) | |
1193 | */ | |
1194 | for (i = 0; i < sband->n_channels; i++) { | |
1195 | struct ieee80211_channel *c = &sband->channels[i]; | |
1196 | if (c->center_freq == (channel->center_freq - 20)) | |
1197 | channel_before = c; | |
1198 | if (c->center_freq == (channel->center_freq + 20)) | |
1199 | channel_after = c; | |
1200 | } | |
1201 | ||
1202 | /* | |
1203 | * Please note that this assumes target bandwidth is 20 MHz, | |
1204 | * if that ever changes we also need to change the below logic | |
1205 | * to include that as well. | |
1206 | */ | |
1207 | if (is_ht40_not_allowed(channel_before)) | |
1208 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; | |
1209 | else | |
1210 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; | |
1211 | ||
1212 | if (is_ht40_not_allowed(channel_after)) | |
1213 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; | |
1214 | else | |
1215 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; | |
1216 | } | |
1217 | ||
1218 | static void reg_process_ht_flags_band(struct wiphy *wiphy, | |
1219 | enum ieee80211_band band) | |
1220 | { | |
1221 | unsigned int i; | |
1222 | struct ieee80211_supported_band *sband; | |
1223 | ||
1224 | BUG_ON(!wiphy->bands[band]); | |
1225 | sband = wiphy->bands[band]; | |
1226 | ||
1227 | for (i = 0; i < sband->n_channels; i++) | |
1228 | reg_process_ht_flags_channel(wiphy, band, i); | |
1229 | } | |
1230 | ||
1231 | static void reg_process_ht_flags(struct wiphy *wiphy) | |
1232 | { | |
1233 | enum ieee80211_band band; | |
1234 | ||
1235 | if (!wiphy) | |
1236 | return; | |
1237 | ||
1238 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1239 | if (wiphy->bands[band]) | |
1240 | reg_process_ht_flags_band(wiphy, band); | |
1241 | } | |
1242 | ||
1243 | } | |
1244 | ||
1245 | static void wiphy_update_regulatory(struct wiphy *wiphy, | |
1246 | enum nl80211_reg_initiator initiator) | |
1247 | { | |
1248 | enum ieee80211_band band; | |
1249 | ||
1250 | assert_reg_lock(); | |
1251 | ||
1252 | if (ignore_reg_update(wiphy, initiator)) | |
1253 | return; | |
1254 | ||
1255 | last_request->dfs_region = cfg80211_regdomain->dfs_region; | |
1256 | ||
1257 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1258 | if (wiphy->bands[band]) | |
1259 | handle_band(wiphy, band, initiator); | |
1260 | } | |
1261 | ||
1262 | reg_process_beacons(wiphy); | |
1263 | reg_process_ht_flags(wiphy); | |
1264 | if (wiphy->reg_notifier) | |
1265 | wiphy->reg_notifier(wiphy, last_request); | |
1266 | } | |
1267 | ||
1268 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) | |
1269 | { | |
1270 | struct cfg80211_registered_device *rdev; | |
1271 | struct wiphy *wiphy; | |
1272 | ||
1273 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
1274 | wiphy = &rdev->wiphy; | |
1275 | wiphy_update_regulatory(wiphy, initiator); | |
1276 | /* | |
1277 | * Regulatory updates set by CORE are ignored for custom | |
1278 | * regulatory cards. Let us notify the changes to the driver, | |
1279 | * as some drivers used this to restore its orig_* reg domain. | |
1280 | */ | |
1281 | if (initiator == NL80211_REGDOM_SET_BY_CORE && | |
1282 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY && | |
1283 | wiphy->reg_notifier) | |
1284 | wiphy->reg_notifier(wiphy, last_request); | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | static void handle_channel_custom(struct wiphy *wiphy, | |
1289 | enum ieee80211_band band, | |
1290 | unsigned int chan_idx, | |
1291 | const struct ieee80211_regdomain *regd) | |
1292 | { | |
1293 | int r; | |
1294 | u32 desired_bw_khz = MHZ_TO_KHZ(20); | |
1295 | u32 bw_flags = 0; | |
1296 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1297 | const struct ieee80211_power_rule *power_rule = NULL; | |
1298 | const struct ieee80211_freq_range *freq_range = NULL; | |
1299 | struct ieee80211_supported_band *sband; | |
1300 | struct ieee80211_channel *chan; | |
1301 | ||
1302 | assert_reg_lock(); | |
1303 | ||
1304 | sband = wiphy->bands[band]; | |
1305 | BUG_ON(chan_idx >= sband->n_channels); | |
1306 | chan = &sband->channels[chan_idx]; | |
1307 | ||
1308 | r = freq_reg_info_regd(wiphy, | |
1309 | MHZ_TO_KHZ(chan->center_freq), | |
1310 | desired_bw_khz, | |
1311 | ®_rule, | |
1312 | regd); | |
1313 | ||
1314 | if (r) { | |
1315 | REG_DBG_PRINT("Disabling freq %d MHz as custom " | |
1316 | "regd has no rule that fits a %d MHz " | |
1317 | "wide channel\n", | |
1318 | chan->center_freq, | |
1319 | KHZ_TO_MHZ(desired_bw_khz)); | |
1320 | chan->flags = IEEE80211_CHAN_DISABLED; | |
1321 | return; | |
1322 | } | |
1323 | ||
1324 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); | |
1325 | ||
1326 | power_rule = ®_rule->power_rule; | |
1327 | freq_range = ®_rule->freq_range; | |
1328 | ||
1329 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1330 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
1331 | ||
1332 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; | |
1333 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
1334 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
1335 | } | |
1336 | ||
1337 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1338 | const struct ieee80211_regdomain *regd) | |
1339 | { | |
1340 | unsigned int i; | |
1341 | struct ieee80211_supported_band *sband; | |
1342 | ||
1343 | BUG_ON(!wiphy->bands[band]); | |
1344 | sband = wiphy->bands[band]; | |
1345 | ||
1346 | for (i = 0; i < sband->n_channels; i++) | |
1347 | handle_channel_custom(wiphy, band, i, regd); | |
1348 | } | |
1349 | ||
1350 | /* Used by drivers prior to wiphy registration */ | |
1351 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1352 | const struct ieee80211_regdomain *regd) | |
1353 | { | |
1354 | enum ieee80211_band band; | |
1355 | unsigned int bands_set = 0; | |
1356 | ||
1357 | mutex_lock(®_mutex); | |
1358 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1359 | if (!wiphy->bands[band]) | |
1360 | continue; | |
1361 | handle_band_custom(wiphy, band, regd); | |
1362 | bands_set++; | |
1363 | } | |
1364 | mutex_unlock(®_mutex); | |
1365 | ||
1366 | /* | |
1367 | * no point in calling this if it won't have any effect | |
1368 | * on your device's supportd bands. | |
1369 | */ | |
1370 | WARN_ON(!bands_set); | |
1371 | } | |
1372 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); | |
1373 | ||
1374 | /* | |
1375 | * Return value which can be used by ignore_request() to indicate | |
1376 | * it has been determined we should intersect two regulatory domains | |
1377 | */ | |
1378 | #define REG_INTERSECT 1 | |
1379 | ||
1380 | /* This has the logic which determines when a new request | |
1381 | * should be ignored. */ | |
1382 | static int ignore_request(struct wiphy *wiphy, | |
1383 | struct regulatory_request *pending_request) | |
1384 | { | |
1385 | struct wiphy *last_wiphy = NULL; | |
1386 | ||
1387 | assert_cfg80211_lock(); | |
1388 | ||
1389 | /* All initial requests are respected */ | |
1390 | if (!last_request) | |
1391 | return 0; | |
1392 | ||
1393 | switch (pending_request->initiator) { | |
1394 | case NL80211_REGDOM_SET_BY_CORE: | |
1395 | return 0; | |
1396 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
1397 | ||
1398 | if (reg_request_cell_base(last_request)) { | |
1399 | /* Trust a Cell base station over the AP's country IE */ | |
1400 | if (regdom_changes(pending_request->alpha2)) | |
1401 | return -EOPNOTSUPP; | |
1402 | return -EALREADY; | |
1403 | } | |
1404 | ||
1405 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1406 | ||
1407 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) | |
1408 | return -EINVAL; | |
1409 | if (last_request->initiator == | |
1410 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
1411 | if (last_wiphy != wiphy) { | |
1412 | /* | |
1413 | * Two cards with two APs claiming different | |
1414 | * Country IE alpha2s. We could | |
1415 | * intersect them, but that seems unlikely | |
1416 | * to be correct. Reject second one for now. | |
1417 | */ | |
1418 | if (regdom_changes(pending_request->alpha2)) | |
1419 | return -EOPNOTSUPP; | |
1420 | return -EALREADY; | |
1421 | } | |
1422 | /* | |
1423 | * Two consecutive Country IE hints on the same wiphy. | |
1424 | * This should be picked up early by the driver/stack | |
1425 | */ | |
1426 | if (WARN_ON(regdom_changes(pending_request->alpha2))) | |
1427 | return 0; | |
1428 | return -EALREADY; | |
1429 | } | |
1430 | return 0; | |
1431 | case NL80211_REGDOM_SET_BY_DRIVER: | |
1432 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
1433 | if (regdom_changes(pending_request->alpha2)) | |
1434 | return 0; | |
1435 | return -EALREADY; | |
1436 | } | |
1437 | ||
1438 | /* | |
1439 | * This would happen if you unplug and plug your card | |
1440 | * back in or if you add a new device for which the previously | |
1441 | * loaded card also agrees on the regulatory domain. | |
1442 | */ | |
1443 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && | |
1444 | !regdom_changes(pending_request->alpha2)) | |
1445 | return -EALREADY; | |
1446 | ||
1447 | return REG_INTERSECT; | |
1448 | case NL80211_REGDOM_SET_BY_USER: | |
1449 | if (reg_request_cell_base(pending_request)) | |
1450 | return reg_ignore_cell_hint(pending_request); | |
1451 | ||
1452 | if (reg_request_cell_base(last_request)) | |
1453 | return -EOPNOTSUPP; | |
1454 | ||
1455 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
1456 | return REG_INTERSECT; | |
1457 | /* | |
1458 | * If the user knows better the user should set the regdom | |
1459 | * to their country before the IE is picked up | |
1460 | */ | |
1461 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && | |
1462 | last_request->intersect) | |
1463 | return -EOPNOTSUPP; | |
1464 | /* | |
1465 | * Process user requests only after previous user/driver/core | |
1466 | * requests have been processed | |
1467 | */ | |
1468 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || | |
1469 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1470 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
1471 | if (regdom_changes(last_request->alpha2)) | |
1472 | return -EAGAIN; | |
1473 | } | |
1474 | ||
1475 | if (!regdom_changes(pending_request->alpha2)) | |
1476 | return -EALREADY; | |
1477 | ||
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | return -EINVAL; | |
1482 | } | |
1483 | ||
1484 | static void reg_set_request_processed(void) | |
1485 | { | |
1486 | bool need_more_processing = false; | |
1487 | ||
1488 | last_request->processed = true; | |
1489 | ||
1490 | spin_lock(®_requests_lock); | |
1491 | if (!list_empty(®_requests_list)) | |
1492 | need_more_processing = true; | |
1493 | spin_unlock(®_requests_lock); | |
1494 | ||
1495 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) | |
1496 | cancel_delayed_work(®_timeout); | |
1497 | ||
1498 | if (need_more_processing) | |
1499 | schedule_work(®_work); | |
1500 | } | |
1501 | ||
1502 | /** | |
1503 | * __regulatory_hint - hint to the wireless core a regulatory domain | |
1504 | * @wiphy: if the hint comes from country information from an AP, this | |
1505 | * is required to be set to the wiphy that received the information | |
1506 | * @pending_request: the regulatory request currently being processed | |
1507 | * | |
1508 | * The Wireless subsystem can use this function to hint to the wireless core | |
1509 | * what it believes should be the current regulatory domain. | |
1510 | * | |
1511 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1512 | * already been set or other standard error codes. | |
1513 | * | |
1514 | * Caller must hold &cfg80211_mutex and ®_mutex | |
1515 | */ | |
1516 | static int __regulatory_hint(struct wiphy *wiphy, | |
1517 | struct regulatory_request *pending_request) | |
1518 | { | |
1519 | bool intersect = false; | |
1520 | int r = 0; | |
1521 | ||
1522 | assert_cfg80211_lock(); | |
1523 | ||
1524 | r = ignore_request(wiphy, pending_request); | |
1525 | ||
1526 | if (r == REG_INTERSECT) { | |
1527 | if (pending_request->initiator == | |
1528 | NL80211_REGDOM_SET_BY_DRIVER) { | |
1529 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); | |
1530 | if (r) { | |
1531 | kfree(pending_request); | |
1532 | return r; | |
1533 | } | |
1534 | } | |
1535 | intersect = true; | |
1536 | } else if (r) { | |
1537 | /* | |
1538 | * If the regulatory domain being requested by the | |
1539 | * driver has already been set just copy it to the | |
1540 | * wiphy | |
1541 | */ | |
1542 | if (r == -EALREADY && | |
1543 | pending_request->initiator == | |
1544 | NL80211_REGDOM_SET_BY_DRIVER) { | |
1545 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); | |
1546 | if (r) { | |
1547 | kfree(pending_request); | |
1548 | return r; | |
1549 | } | |
1550 | r = -EALREADY; | |
1551 | goto new_request; | |
1552 | } | |
1553 | kfree(pending_request); | |
1554 | return r; | |
1555 | } | |
1556 | ||
1557 | new_request: | |
1558 | if (last_request != &core_request_world) | |
1559 | kfree(last_request); | |
1560 | ||
1561 | last_request = pending_request; | |
1562 | last_request->intersect = intersect; | |
1563 | ||
1564 | pending_request = NULL; | |
1565 | ||
1566 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
1567 | user_alpha2[0] = last_request->alpha2[0]; | |
1568 | user_alpha2[1] = last_request->alpha2[1]; | |
1569 | } | |
1570 | ||
1571 | /* When r == REG_INTERSECT we do need to call CRDA */ | |
1572 | if (r < 0) { | |
1573 | /* | |
1574 | * Since CRDA will not be called in this case as we already | |
1575 | * have applied the requested regulatory domain before we just | |
1576 | * inform userspace we have processed the request | |
1577 | */ | |
1578 | if (r == -EALREADY) { | |
1579 | nl80211_send_reg_change_event(last_request); | |
1580 | reg_set_request_processed(); | |
1581 | } | |
1582 | return r; | |
1583 | } | |
1584 | ||
1585 | return call_crda(last_request->alpha2); | |
1586 | } | |
1587 | ||
1588 | /* This processes *all* regulatory hints */ | |
1589 | static void reg_process_hint(struct regulatory_request *reg_request, | |
1590 | enum nl80211_reg_initiator reg_initiator) | |
1591 | { | |
1592 | int r = 0; | |
1593 | struct wiphy *wiphy = NULL; | |
1594 | ||
1595 | BUG_ON(!reg_request->alpha2); | |
1596 | ||
1597 | if (wiphy_idx_valid(reg_request->wiphy_idx)) | |
1598 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1599 | ||
1600 | if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER && | |
1601 | !wiphy) { | |
1602 | kfree(reg_request); | |
1603 | return; | |
1604 | } | |
1605 | ||
1606 | r = __regulatory_hint(wiphy, reg_request); | |
1607 | /* This is required so that the orig_* parameters are saved */ | |
1608 | if (r == -EALREADY && wiphy && | |
1609 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { | |
1610 | wiphy_update_regulatory(wiphy, reg_initiator); | |
1611 | return; | |
1612 | } | |
1613 | ||
1614 | /* | |
1615 | * We only time out user hints, given that they should be the only | |
1616 | * source of bogus requests. | |
1617 | */ | |
1618 | if (r != -EALREADY && | |
1619 | reg_initiator == NL80211_REGDOM_SET_BY_USER) | |
1620 | schedule_delayed_work(®_timeout, msecs_to_jiffies(3142)); | |
1621 | } | |
1622 | ||
1623 | /* | |
1624 | * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* | |
1625 | * Regulatory hints come on a first come first serve basis and we | |
1626 | * must process each one atomically. | |
1627 | */ | |
1628 | static void reg_process_pending_hints(void) | |
1629 | { | |
1630 | struct regulatory_request *reg_request; | |
1631 | ||
1632 | mutex_lock(&cfg80211_mutex); | |
1633 | mutex_lock(®_mutex); | |
1634 | ||
1635 | /* When last_request->processed becomes true this will be rescheduled */ | |
1636 | if (last_request && !last_request->processed) { | |
1637 | REG_DBG_PRINT("Pending regulatory request, waiting " | |
1638 | "for it to be processed...\n"); | |
1639 | goto out; | |
1640 | } | |
1641 | ||
1642 | spin_lock(®_requests_lock); | |
1643 | ||
1644 | if (list_empty(®_requests_list)) { | |
1645 | spin_unlock(®_requests_lock); | |
1646 | goto out; | |
1647 | } | |
1648 | ||
1649 | reg_request = list_first_entry(®_requests_list, | |
1650 | struct regulatory_request, | |
1651 | list); | |
1652 | list_del_init(®_request->list); | |
1653 | ||
1654 | spin_unlock(®_requests_lock); | |
1655 | ||
1656 | reg_process_hint(reg_request, reg_request->initiator); | |
1657 | ||
1658 | out: | |
1659 | mutex_unlock(®_mutex); | |
1660 | mutex_unlock(&cfg80211_mutex); | |
1661 | } | |
1662 | ||
1663 | /* Processes beacon hints -- this has nothing to do with country IEs */ | |
1664 | static void reg_process_pending_beacon_hints(void) | |
1665 | { | |
1666 | struct cfg80211_registered_device *rdev; | |
1667 | struct reg_beacon *pending_beacon, *tmp; | |
1668 | ||
1669 | /* | |
1670 | * No need to hold the reg_mutex here as we just touch wiphys | |
1671 | * and do not read or access regulatory variables. | |
1672 | */ | |
1673 | mutex_lock(&cfg80211_mutex); | |
1674 | ||
1675 | /* This goes through the _pending_ beacon list */ | |
1676 | spin_lock_bh(®_pending_beacons_lock); | |
1677 | ||
1678 | if (list_empty(®_pending_beacons)) { | |
1679 | spin_unlock_bh(®_pending_beacons_lock); | |
1680 | goto out; | |
1681 | } | |
1682 | ||
1683 | list_for_each_entry_safe(pending_beacon, tmp, | |
1684 | ®_pending_beacons, list) { | |
1685 | ||
1686 | list_del_init(&pending_beacon->list); | |
1687 | ||
1688 | /* Applies the beacon hint to current wiphys */ | |
1689 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) | |
1690 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); | |
1691 | ||
1692 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
1693 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
1694 | } | |
1695 | ||
1696 | spin_unlock_bh(®_pending_beacons_lock); | |
1697 | out: | |
1698 | mutex_unlock(&cfg80211_mutex); | |
1699 | } | |
1700 | ||
1701 | static void reg_todo(struct work_struct *work) | |
1702 | { | |
1703 | reg_process_pending_hints(); | |
1704 | reg_process_pending_beacon_hints(); | |
1705 | } | |
1706 | ||
1707 | static void queue_regulatory_request(struct regulatory_request *request) | |
1708 | { | |
1709 | if (isalpha(request->alpha2[0])) | |
1710 | request->alpha2[0] = toupper(request->alpha2[0]); | |
1711 | if (isalpha(request->alpha2[1])) | |
1712 | request->alpha2[1] = toupper(request->alpha2[1]); | |
1713 | ||
1714 | spin_lock(®_requests_lock); | |
1715 | list_add_tail(&request->list, ®_requests_list); | |
1716 | spin_unlock(®_requests_lock); | |
1717 | ||
1718 | schedule_work(®_work); | |
1719 | } | |
1720 | ||
1721 | /* | |
1722 | * Core regulatory hint -- happens during cfg80211_init() | |
1723 | * and when we restore regulatory settings. | |
1724 | */ | |
1725 | static int regulatory_hint_core(const char *alpha2) | |
1726 | { | |
1727 | struct regulatory_request *request; | |
1728 | ||
1729 | request = kzalloc(sizeof(struct regulatory_request), | |
1730 | GFP_KERNEL); | |
1731 | if (!request) | |
1732 | return -ENOMEM; | |
1733 | ||
1734 | request->alpha2[0] = alpha2[0]; | |
1735 | request->alpha2[1] = alpha2[1]; | |
1736 | request->initiator = NL80211_REGDOM_SET_BY_CORE; | |
1737 | ||
1738 | queue_regulatory_request(request); | |
1739 | ||
1740 | return 0; | |
1741 | } | |
1742 | ||
1743 | /* User hints */ | |
1744 | int regulatory_hint_user(const char *alpha2, | |
1745 | enum nl80211_user_reg_hint_type user_reg_hint_type) | |
1746 | { | |
1747 | struct regulatory_request *request; | |
1748 | ||
1749 | BUG_ON(!alpha2); | |
1750 | ||
1751 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1752 | if (!request) | |
1753 | return -ENOMEM; | |
1754 | ||
1755 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1756 | request->alpha2[0] = alpha2[0]; | |
1757 | request->alpha2[1] = alpha2[1]; | |
1758 | request->initiator = NL80211_REGDOM_SET_BY_USER; | |
1759 | request->user_reg_hint_type = user_reg_hint_type; | |
1760 | ||
1761 | queue_regulatory_request(request); | |
1762 | ||
1763 | return 0; | |
1764 | } | |
1765 | ||
1766 | /* Driver hints */ | |
1767 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1768 | { | |
1769 | struct regulatory_request *request; | |
1770 | ||
1771 | BUG_ON(!alpha2); | |
1772 | BUG_ON(!wiphy); | |
1773 | ||
1774 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1775 | if (!request) | |
1776 | return -ENOMEM; | |
1777 | ||
1778 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1779 | ||
1780 | /* Must have registered wiphy first */ | |
1781 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1782 | ||
1783 | request->alpha2[0] = alpha2[0]; | |
1784 | request->alpha2[1] = alpha2[1]; | |
1785 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; | |
1786 | ||
1787 | queue_regulatory_request(request); | |
1788 | ||
1789 | return 0; | |
1790 | } | |
1791 | EXPORT_SYMBOL(regulatory_hint); | |
1792 | ||
1793 | /* | |
1794 | * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and | |
1795 | * therefore cannot iterate over the rdev list here. | |
1796 | */ | |
1797 | void regulatory_hint_11d(struct wiphy *wiphy, | |
1798 | enum ieee80211_band band, | |
1799 | u8 *country_ie, | |
1800 | u8 country_ie_len) | |
1801 | { | |
1802 | char alpha2[2]; | |
1803 | enum environment_cap env = ENVIRON_ANY; | |
1804 | struct regulatory_request *request; | |
1805 | ||
1806 | mutex_lock(®_mutex); | |
1807 | ||
1808 | if (unlikely(!last_request)) | |
1809 | goto out; | |
1810 | ||
1811 | /* IE len must be evenly divisible by 2 */ | |
1812 | if (country_ie_len & 0x01) | |
1813 | goto out; | |
1814 | ||
1815 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1816 | goto out; | |
1817 | ||
1818 | alpha2[0] = country_ie[0]; | |
1819 | alpha2[1] = country_ie[1]; | |
1820 | ||
1821 | if (country_ie[2] == 'I') | |
1822 | env = ENVIRON_INDOOR; | |
1823 | else if (country_ie[2] == 'O') | |
1824 | env = ENVIRON_OUTDOOR; | |
1825 | ||
1826 | /* | |
1827 | * We will run this only upon a successful connection on cfg80211. | |
1828 | * We leave conflict resolution to the workqueue, where can hold | |
1829 | * cfg80211_mutex. | |
1830 | */ | |
1831 | if (likely(last_request->initiator == | |
1832 | NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1833 | wiphy_idx_valid(last_request->wiphy_idx))) | |
1834 | goto out; | |
1835 | ||
1836 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1837 | if (!request) | |
1838 | goto out; | |
1839 | ||
1840 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1841 | request->alpha2[0] = alpha2[0]; | |
1842 | request->alpha2[1] = alpha2[1]; | |
1843 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; | |
1844 | request->country_ie_env = env; | |
1845 | ||
1846 | mutex_unlock(®_mutex); | |
1847 | ||
1848 | queue_regulatory_request(request); | |
1849 | ||
1850 | return; | |
1851 | ||
1852 | out: | |
1853 | mutex_unlock(®_mutex); | |
1854 | } | |
1855 | ||
1856 | static void restore_alpha2(char *alpha2, bool reset_user) | |
1857 | { | |
1858 | /* indicates there is no alpha2 to consider for restoration */ | |
1859 | alpha2[0] = '9'; | |
1860 | alpha2[1] = '7'; | |
1861 | ||
1862 | /* The user setting has precedence over the module parameter */ | |
1863 | if (is_user_regdom_saved()) { | |
1864 | /* Unless we're asked to ignore it and reset it */ | |
1865 | if (reset_user) { | |
1866 | REG_DBG_PRINT("Restoring regulatory settings " | |
1867 | "including user preference\n"); | |
1868 | user_alpha2[0] = '9'; | |
1869 | user_alpha2[1] = '7'; | |
1870 | ||
1871 | /* | |
1872 | * If we're ignoring user settings, we still need to | |
1873 | * check the module parameter to ensure we put things | |
1874 | * back as they were for a full restore. | |
1875 | */ | |
1876 | if (!is_world_regdom(ieee80211_regdom)) { | |
1877 | REG_DBG_PRINT("Keeping preference on " | |
1878 | "module parameter ieee80211_regdom: %c%c\n", | |
1879 | ieee80211_regdom[0], | |
1880 | ieee80211_regdom[1]); | |
1881 | alpha2[0] = ieee80211_regdom[0]; | |
1882 | alpha2[1] = ieee80211_regdom[1]; | |
1883 | } | |
1884 | } else { | |
1885 | REG_DBG_PRINT("Restoring regulatory settings " | |
1886 | "while preserving user preference for: %c%c\n", | |
1887 | user_alpha2[0], | |
1888 | user_alpha2[1]); | |
1889 | alpha2[0] = user_alpha2[0]; | |
1890 | alpha2[1] = user_alpha2[1]; | |
1891 | } | |
1892 | } else if (!is_world_regdom(ieee80211_regdom)) { | |
1893 | REG_DBG_PRINT("Keeping preference on " | |
1894 | "module parameter ieee80211_regdom: %c%c\n", | |
1895 | ieee80211_regdom[0], | |
1896 | ieee80211_regdom[1]); | |
1897 | alpha2[0] = ieee80211_regdom[0]; | |
1898 | alpha2[1] = ieee80211_regdom[1]; | |
1899 | } else | |
1900 | REG_DBG_PRINT("Restoring regulatory settings\n"); | |
1901 | } | |
1902 | ||
1903 | static void restore_custom_reg_settings(struct wiphy *wiphy) | |
1904 | { | |
1905 | struct ieee80211_supported_band *sband; | |
1906 | enum ieee80211_band band; | |
1907 | struct ieee80211_channel *chan; | |
1908 | int i; | |
1909 | ||
1910 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1911 | sband = wiphy->bands[band]; | |
1912 | if (!sband) | |
1913 | continue; | |
1914 | for (i = 0; i < sband->n_channels; i++) { | |
1915 | chan = &sband->channels[i]; | |
1916 | chan->flags = chan->orig_flags; | |
1917 | chan->max_antenna_gain = chan->orig_mag; | |
1918 | chan->max_power = chan->orig_mpwr; | |
1919 | chan->beacon_found = false; | |
1920 | } | |
1921 | } | |
1922 | } | |
1923 | ||
1924 | /* | |
1925 | * Restoring regulatory settings involves ingoring any | |
1926 | * possibly stale country IE information and user regulatory | |
1927 | * settings if so desired, this includes any beacon hints | |
1928 | * learned as we could have traveled outside to another country | |
1929 | * after disconnection. To restore regulatory settings we do | |
1930 | * exactly what we did at bootup: | |
1931 | * | |
1932 | * - send a core regulatory hint | |
1933 | * - send a user regulatory hint if applicable | |
1934 | * | |
1935 | * Device drivers that send a regulatory hint for a specific country | |
1936 | * keep their own regulatory domain on wiphy->regd so that does does | |
1937 | * not need to be remembered. | |
1938 | */ | |
1939 | static void restore_regulatory_settings(bool reset_user) | |
1940 | { | |
1941 | char alpha2[2]; | |
1942 | char world_alpha2[2]; | |
1943 | struct reg_beacon *reg_beacon, *btmp; | |
1944 | struct regulatory_request *reg_request, *tmp; | |
1945 | LIST_HEAD(tmp_reg_req_list); | |
1946 | struct cfg80211_registered_device *rdev; | |
1947 | ||
1948 | mutex_lock(&cfg80211_mutex); | |
1949 | mutex_lock(®_mutex); | |
1950 | ||
1951 | reset_regdomains(true); | |
1952 | restore_alpha2(alpha2, reset_user); | |
1953 | ||
1954 | /* | |
1955 | * If there's any pending requests we simply | |
1956 | * stash them to a temporary pending queue and | |
1957 | * add then after we've restored regulatory | |
1958 | * settings. | |
1959 | */ | |
1960 | spin_lock(®_requests_lock); | |
1961 | if (!list_empty(®_requests_list)) { | |
1962 | list_for_each_entry_safe(reg_request, tmp, | |
1963 | ®_requests_list, list) { | |
1964 | if (reg_request->initiator != | |
1965 | NL80211_REGDOM_SET_BY_USER) | |
1966 | continue; | |
1967 | list_move_tail(®_request->list, &tmp_reg_req_list); | |
1968 | } | |
1969 | } | |
1970 | spin_unlock(®_requests_lock); | |
1971 | ||
1972 | /* Clear beacon hints */ | |
1973 | spin_lock_bh(®_pending_beacons_lock); | |
1974 | if (!list_empty(®_pending_beacons)) { | |
1975 | list_for_each_entry_safe(reg_beacon, btmp, | |
1976 | ®_pending_beacons, list) { | |
1977 | list_del(®_beacon->list); | |
1978 | kfree(reg_beacon); | |
1979 | } | |
1980 | } | |
1981 | spin_unlock_bh(®_pending_beacons_lock); | |
1982 | ||
1983 | if (!list_empty(®_beacon_list)) { | |
1984 | list_for_each_entry_safe(reg_beacon, btmp, | |
1985 | ®_beacon_list, list) { | |
1986 | list_del(®_beacon->list); | |
1987 | kfree(reg_beacon); | |
1988 | } | |
1989 | } | |
1990 | ||
1991 | /* First restore to the basic regulatory settings */ | |
1992 | cfg80211_regdomain = cfg80211_world_regdom; | |
1993 | world_alpha2[0] = cfg80211_regdomain->alpha2[0]; | |
1994 | world_alpha2[1] = cfg80211_regdomain->alpha2[1]; | |
1995 | ||
1996 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
1997 | if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY) | |
1998 | restore_custom_reg_settings(&rdev->wiphy); | |
1999 | } | |
2000 | ||
2001 | mutex_unlock(®_mutex); | |
2002 | mutex_unlock(&cfg80211_mutex); | |
2003 | ||
2004 | regulatory_hint_core(world_alpha2); | |
2005 | ||
2006 | /* | |
2007 | * This restores the ieee80211_regdom module parameter | |
2008 | * preference or the last user requested regulatory | |
2009 | * settings, user regulatory settings takes precedence. | |
2010 | */ | |
2011 | if (is_an_alpha2(alpha2)) | |
2012 | regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER); | |
2013 | ||
2014 | if (list_empty(&tmp_reg_req_list)) | |
2015 | return; | |
2016 | ||
2017 | mutex_lock(&cfg80211_mutex); | |
2018 | mutex_lock(®_mutex); | |
2019 | ||
2020 | spin_lock(®_requests_lock); | |
2021 | list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) { | |
2022 | REG_DBG_PRINT("Adding request for country %c%c back " | |
2023 | "into the queue\n", | |
2024 | reg_request->alpha2[0], | |
2025 | reg_request->alpha2[1]); | |
2026 | list_move_tail(®_request->list, ®_requests_list); | |
2027 | } | |
2028 | spin_unlock(®_requests_lock); | |
2029 | ||
2030 | mutex_unlock(®_mutex); | |
2031 | mutex_unlock(&cfg80211_mutex); | |
2032 | ||
2033 | REG_DBG_PRINT("Kicking the queue\n"); | |
2034 | ||
2035 | schedule_work(®_work); | |
2036 | } | |
2037 | ||
2038 | void regulatory_hint_disconnect(void) | |
2039 | { | |
2040 | REG_DBG_PRINT("All devices are disconnected, going to " | |
2041 | "restore regulatory settings\n"); | |
2042 | restore_regulatory_settings(false); | |
2043 | } | |
2044 | ||
2045 | static bool freq_is_chan_12_13_14(u16 freq) | |
2046 | { | |
2047 | if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) || | |
2048 | freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) || | |
2049 | freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ)) | |
2050 | return true; | |
2051 | return false; | |
2052 | } | |
2053 | ||
2054 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
2055 | struct ieee80211_channel *beacon_chan, | |
2056 | gfp_t gfp) | |
2057 | { | |
2058 | struct reg_beacon *reg_beacon; | |
2059 | ||
2060 | if (likely((beacon_chan->beacon_found || | |
2061 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || | |
2062 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
2063 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) | |
2064 | return 0; | |
2065 | ||
2066 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
2067 | if (!reg_beacon) | |
2068 | return -ENOMEM; | |
2069 | ||
2070 | REG_DBG_PRINT("Found new beacon on " | |
2071 | "frequency: %d MHz (Ch %d) on %s\n", | |
2072 | beacon_chan->center_freq, | |
2073 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
2074 | wiphy_name(wiphy)); | |
2075 | ||
2076 | memcpy(®_beacon->chan, beacon_chan, | |
2077 | sizeof(struct ieee80211_channel)); | |
2078 | ||
2079 | ||
2080 | /* | |
2081 | * Since we can be called from BH or and non-BH context | |
2082 | * we must use spin_lock_bh() | |
2083 | */ | |
2084 | spin_lock_bh(®_pending_beacons_lock); | |
2085 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
2086 | spin_unlock_bh(®_pending_beacons_lock); | |
2087 | ||
2088 | schedule_work(®_work); | |
2089 | ||
2090 | return 0; | |
2091 | } | |
2092 | ||
2093 | static void print_rd_rules(const struct ieee80211_regdomain *rd) | |
2094 | { | |
2095 | unsigned int i; | |
2096 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
2097 | const struct ieee80211_freq_range *freq_range = NULL; | |
2098 | const struct ieee80211_power_rule *power_rule = NULL; | |
2099 | ||
2100 | pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n"); | |
2101 | ||
2102 | for (i = 0; i < rd->n_reg_rules; i++) { | |
2103 | reg_rule = &rd->reg_rules[i]; | |
2104 | freq_range = ®_rule->freq_range; | |
2105 | power_rule = ®_rule->power_rule; | |
2106 | ||
2107 | /* | |
2108 | * There may not be documentation for max antenna gain | |
2109 | * in certain regions | |
2110 | */ | |
2111 | if (power_rule->max_antenna_gain) | |
2112 | pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n", | |
2113 | freq_range->start_freq_khz, | |
2114 | freq_range->end_freq_khz, | |
2115 | freq_range->max_bandwidth_khz, | |
2116 | power_rule->max_antenna_gain, | |
2117 | power_rule->max_eirp); | |
2118 | else | |
2119 | pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n", | |
2120 | freq_range->start_freq_khz, | |
2121 | freq_range->end_freq_khz, | |
2122 | freq_range->max_bandwidth_khz, | |
2123 | power_rule->max_eirp); | |
2124 | } | |
2125 | } | |
2126 | ||
2127 | bool reg_supported_dfs_region(u8 dfs_region) | |
2128 | { | |
2129 | switch (dfs_region) { | |
2130 | case NL80211_DFS_UNSET: | |
2131 | case NL80211_DFS_FCC: | |
2132 | case NL80211_DFS_ETSI: | |
2133 | case NL80211_DFS_JP: | |
2134 | return true; | |
2135 | default: | |
2136 | REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n", | |
2137 | dfs_region); | |
2138 | return false; | |
2139 | } | |
2140 | } | |
2141 | ||
2142 | static void print_dfs_region(u8 dfs_region) | |
2143 | { | |
2144 | if (!dfs_region) | |
2145 | return; | |
2146 | ||
2147 | switch (dfs_region) { | |
2148 | case NL80211_DFS_FCC: | |
2149 | pr_info(" DFS Master region FCC"); | |
2150 | break; | |
2151 | case NL80211_DFS_ETSI: | |
2152 | pr_info(" DFS Master region ETSI"); | |
2153 | break; | |
2154 | case NL80211_DFS_JP: | |
2155 | pr_info(" DFS Master region JP"); | |
2156 | break; | |
2157 | default: | |
2158 | pr_info(" DFS Master region Uknown"); | |
2159 | break; | |
2160 | } | |
2161 | } | |
2162 | ||
2163 | static void print_regdomain(const struct ieee80211_regdomain *rd) | |
2164 | { | |
2165 | ||
2166 | if (is_intersected_alpha2(rd->alpha2)) { | |
2167 | ||
2168 | if (last_request->initiator == | |
2169 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
2170 | struct cfg80211_registered_device *rdev; | |
2171 | rdev = cfg80211_rdev_by_wiphy_idx( | |
2172 | last_request->wiphy_idx); | |
2173 | if (rdev) { | |
2174 | pr_info("Current regulatory domain updated by AP to: %c%c\n", | |
2175 | rdev->country_ie_alpha2[0], | |
2176 | rdev->country_ie_alpha2[1]); | |
2177 | } else | |
2178 | pr_info("Current regulatory domain intersected:\n"); | |
2179 | } else | |
2180 | pr_info("Current regulatory domain intersected:\n"); | |
2181 | } else if (is_world_regdom(rd->alpha2)) | |
2182 | pr_info("World regulatory domain updated:\n"); | |
2183 | else { | |
2184 | if (is_unknown_alpha2(rd->alpha2)) | |
2185 | pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n"); | |
2186 | else { | |
2187 | if (reg_request_cell_base(last_request)) | |
2188 | pr_info("Regulatory domain changed " | |
2189 | "to country: %c%c by Cell Station\n", | |
2190 | rd->alpha2[0], rd->alpha2[1]); | |
2191 | else | |
2192 | pr_info("Regulatory domain changed " | |
2193 | "to country: %c%c\n", | |
2194 | rd->alpha2[0], rd->alpha2[1]); | |
2195 | } | |
2196 | } | |
2197 | print_dfs_region(rd->dfs_region); | |
2198 | print_rd_rules(rd); | |
2199 | } | |
2200 | ||
2201 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) | |
2202 | { | |
2203 | pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]); | |
2204 | print_rd_rules(rd); | |
2205 | } | |
2206 | ||
2207 | /* Takes ownership of rd only if it doesn't fail */ | |
2208 | static int __set_regdom(const struct ieee80211_regdomain *rd) | |
2209 | { | |
2210 | const struct ieee80211_regdomain *intersected_rd = NULL; | |
2211 | struct wiphy *request_wiphy; | |
2212 | /* Some basic sanity checks first */ | |
2213 | ||
2214 | if (is_world_regdom(rd->alpha2)) { | |
2215 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) | |
2216 | return -EINVAL; | |
2217 | update_world_regdomain(rd); | |
2218 | return 0; | |
2219 | } | |
2220 | ||
2221 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
2222 | !is_unknown_alpha2(rd->alpha2)) | |
2223 | return -EINVAL; | |
2224 | ||
2225 | if (!last_request) | |
2226 | return -EINVAL; | |
2227 | ||
2228 | /* | |
2229 | * Lets only bother proceeding on the same alpha2 if the current | |
2230 | * rd is non static (it means CRDA was present and was used last) | |
2231 | * and the pending request came in from a country IE | |
2232 | */ | |
2233 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
2234 | /* | |
2235 | * If someone else asked us to change the rd lets only bother | |
2236 | * checking if the alpha2 changes if CRDA was already called | |
2237 | */ | |
2238 | if (!regdom_changes(rd->alpha2)) | |
2239 | return -EALREADY; | |
2240 | } | |
2241 | ||
2242 | /* | |
2243 | * Now lets set the regulatory domain, update all driver channels | |
2244 | * and finally inform them of what we have done, in case they want | |
2245 | * to review or adjust their own settings based on their own | |
2246 | * internal EEPROM data | |
2247 | */ | |
2248 | ||
2249 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) | |
2250 | return -EINVAL; | |
2251 | ||
2252 | if (!is_valid_rd(rd)) { | |
2253 | pr_err("Invalid regulatory domain detected:\n"); | |
2254 | print_regdomain_info(rd); | |
2255 | return -EINVAL; | |
2256 | } | |
2257 | ||
2258 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
2259 | if (!request_wiphy && | |
2260 | (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
2261 | last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) { | |
2262 | schedule_delayed_work(®_timeout, 0); | |
2263 | return -ENODEV; | |
2264 | } | |
2265 | ||
2266 | if (!last_request->intersect) { | |
2267 | int r; | |
2268 | ||
2269 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { | |
2270 | reset_regdomains(false); | |
2271 | cfg80211_regdomain = rd; | |
2272 | return 0; | |
2273 | } | |
2274 | ||
2275 | /* | |
2276 | * For a driver hint, lets copy the regulatory domain the | |
2277 | * driver wanted to the wiphy to deal with conflicts | |
2278 | */ | |
2279 | ||
2280 | /* | |
2281 | * Userspace could have sent two replies with only | |
2282 | * one kernel request. | |
2283 | */ | |
2284 | if (request_wiphy->regd) | |
2285 | return -EALREADY; | |
2286 | ||
2287 | r = reg_copy_regd(&request_wiphy->regd, rd); | |
2288 | if (r) | |
2289 | return r; | |
2290 | ||
2291 | reset_regdomains(false); | |
2292 | cfg80211_regdomain = rd; | |
2293 | return 0; | |
2294 | } | |
2295 | ||
2296 | /* Intersection requires a bit more work */ | |
2297 | ||
2298 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
2299 | ||
2300 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); | |
2301 | if (!intersected_rd) | |
2302 | return -EINVAL; | |
2303 | ||
2304 | /* | |
2305 | * We can trash what CRDA provided now. | |
2306 | * However if a driver requested this specific regulatory | |
2307 | * domain we keep it for its private use | |
2308 | */ | |
2309 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) | |
2310 | request_wiphy->regd = rd; | |
2311 | else | |
2312 | kfree(rd); | |
2313 | ||
2314 | rd = NULL; | |
2315 | ||
2316 | reset_regdomains(false); | |
2317 | cfg80211_regdomain = intersected_rd; | |
2318 | ||
2319 | return 0; | |
2320 | } | |
2321 | ||
2322 | return -EINVAL; | |
2323 | } | |
2324 | ||
2325 | ||
2326 | /* | |
2327 | * Use this call to set the current regulatory domain. Conflicts with | |
2328 | * multiple drivers can be ironed out later. Caller must've already | |
2329 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex | |
2330 | */ | |
2331 | int set_regdom(const struct ieee80211_regdomain *rd) | |
2332 | { | |
2333 | int r; | |
2334 | ||
2335 | assert_cfg80211_lock(); | |
2336 | ||
2337 | mutex_lock(®_mutex); | |
2338 | ||
2339 | /* Note that this doesn't update the wiphys, this is done below */ | |
2340 | r = __set_regdom(rd); | |
2341 | if (r) { | |
2342 | if (r == -EALREADY) | |
2343 | reg_set_request_processed(); | |
2344 | ||
2345 | kfree(rd); | |
2346 | mutex_unlock(®_mutex); | |
2347 | return r; | |
2348 | } | |
2349 | ||
2350 | /* This would make this whole thing pointless */ | |
2351 | if (!last_request->intersect) | |
2352 | BUG_ON(rd != cfg80211_regdomain); | |
2353 | ||
2354 | /* update all wiphys now with the new established regulatory domain */ | |
2355 | update_all_wiphy_regulatory(last_request->initiator); | |
2356 | ||
2357 | print_regdomain(cfg80211_regdomain); | |
2358 | ||
2359 | nl80211_send_reg_change_event(last_request); | |
2360 | ||
2361 | reg_set_request_processed(); | |
2362 | ||
2363 | mutex_unlock(®_mutex); | |
2364 | ||
2365 | return r; | |
2366 | } | |
2367 | ||
2368 | #ifdef CONFIG_HOTPLUG | |
2369 | int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
2370 | { | |
2371 | if (last_request && !last_request->processed) { | |
2372 | if (add_uevent_var(env, "COUNTRY=%c%c", | |
2373 | last_request->alpha2[0], | |
2374 | last_request->alpha2[1])) | |
2375 | return -ENOMEM; | |
2376 | } | |
2377 | ||
2378 | return 0; | |
2379 | } | |
2380 | #else | |
2381 | int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
2382 | { | |
2383 | return -ENODEV; | |
2384 | } | |
2385 | #endif /* CONFIG_HOTPLUG */ | |
2386 | ||
2387 | void wiphy_regulatory_register(struct wiphy *wiphy) | |
2388 | { | |
2389 | assert_cfg80211_lock(); | |
2390 | ||
2391 | mutex_lock(®_mutex); | |
2392 | ||
2393 | if (!reg_dev_ignore_cell_hint(wiphy)) | |
2394 | reg_num_devs_support_basehint++; | |
2395 | ||
2396 | wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); | |
2397 | ||
2398 | mutex_unlock(®_mutex); | |
2399 | } | |
2400 | ||
2401 | /* Caller must hold cfg80211_mutex */ | |
2402 | void wiphy_regulatory_deregister(struct wiphy *wiphy) | |
2403 | { | |
2404 | struct wiphy *request_wiphy = NULL; | |
2405 | ||
2406 | assert_cfg80211_lock(); | |
2407 | ||
2408 | mutex_lock(®_mutex); | |
2409 | ||
2410 | if (!reg_dev_ignore_cell_hint(wiphy)) | |
2411 | reg_num_devs_support_basehint--; | |
2412 | ||
2413 | kfree(wiphy->regd); | |
2414 | ||
2415 | if (last_request) | |
2416 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
2417 | ||
2418 | if (!request_wiphy || request_wiphy != wiphy) | |
2419 | goto out; | |
2420 | ||
2421 | last_request->wiphy_idx = WIPHY_IDX_STALE; | |
2422 | last_request->country_ie_env = ENVIRON_ANY; | |
2423 | out: | |
2424 | mutex_unlock(®_mutex); | |
2425 | } | |
2426 | ||
2427 | static void reg_timeout_work(struct work_struct *work) | |
2428 | { | |
2429 | REG_DBG_PRINT("Timeout while waiting for CRDA to reply, " | |
2430 | "restoring regulatory settings\n"); | |
2431 | restore_regulatory_settings(true); | |
2432 | } | |
2433 | ||
2434 | int __init regulatory_init(void) | |
2435 | { | |
2436 | int err = 0; | |
2437 | ||
2438 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); | |
2439 | if (IS_ERR(reg_pdev)) | |
2440 | return PTR_ERR(reg_pdev); | |
2441 | ||
2442 | reg_pdev->dev.type = ®_device_type; | |
2443 | ||
2444 | spin_lock_init(®_requests_lock); | |
2445 | spin_lock_init(®_pending_beacons_lock); | |
2446 | ||
2447 | reg_regdb_size_check(); | |
2448 | ||
2449 | cfg80211_regdomain = cfg80211_world_regdom; | |
2450 | ||
2451 | user_alpha2[0] = '9'; | |
2452 | user_alpha2[1] = '7'; | |
2453 | ||
2454 | /* We always try to get an update for the static regdomain */ | |
2455 | err = regulatory_hint_core(cfg80211_regdomain->alpha2); | |
2456 | if (err) { | |
2457 | if (err == -ENOMEM) | |
2458 | return err; | |
2459 | /* | |
2460 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2461 | * memory which is handled and propagated appropriately above | |
2462 | * but it can also fail during a netlink_broadcast() or during | |
2463 | * early boot for call_usermodehelper(). For now treat these | |
2464 | * errors as non-fatal. | |
2465 | */ | |
2466 | pr_err("kobject_uevent_env() was unable to call CRDA during init\n"); | |
2467 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
2468 | /* We want to find out exactly why when debugging */ | |
2469 | WARN_ON(err); | |
2470 | #endif | |
2471 | } | |
2472 | ||
2473 | /* | |
2474 | * Finally, if the user set the module parameter treat it | |
2475 | * as a user hint. | |
2476 | */ | |
2477 | if (!is_world_regdom(ieee80211_regdom)) | |
2478 | regulatory_hint_user(ieee80211_regdom, | |
2479 | NL80211_USER_REG_HINT_USER); | |
2480 | ||
2481 | return 0; | |
2482 | } | |
2483 | ||
2484 | void /* __init_or_exit */ regulatory_exit(void) | |
2485 | { | |
2486 | struct regulatory_request *reg_request, *tmp; | |
2487 | struct reg_beacon *reg_beacon, *btmp; | |
2488 | ||
2489 | cancel_work_sync(®_work); | |
2490 | cancel_delayed_work_sync(®_timeout); | |
2491 | ||
2492 | mutex_lock(&cfg80211_mutex); | |
2493 | mutex_lock(®_mutex); | |
2494 | ||
2495 | reset_regdomains(true); | |
2496 | ||
2497 | dev_set_uevent_suppress(®_pdev->dev, true); | |
2498 | ||
2499 | platform_device_unregister(reg_pdev); | |
2500 | ||
2501 | spin_lock_bh(®_pending_beacons_lock); | |
2502 | if (!list_empty(®_pending_beacons)) { | |
2503 | list_for_each_entry_safe(reg_beacon, btmp, | |
2504 | ®_pending_beacons, list) { | |
2505 | list_del(®_beacon->list); | |
2506 | kfree(reg_beacon); | |
2507 | } | |
2508 | } | |
2509 | spin_unlock_bh(®_pending_beacons_lock); | |
2510 | ||
2511 | if (!list_empty(®_beacon_list)) { | |
2512 | list_for_each_entry_safe(reg_beacon, btmp, | |
2513 | ®_beacon_list, list) { | |
2514 | list_del(®_beacon->list); | |
2515 | kfree(reg_beacon); | |
2516 | } | |
2517 | } | |
2518 | ||
2519 | spin_lock(®_requests_lock); | |
2520 | if (!list_empty(®_requests_list)) { | |
2521 | list_for_each_entry_safe(reg_request, tmp, | |
2522 | ®_requests_list, list) { | |
2523 | list_del(®_request->list); | |
2524 | kfree(reg_request); | |
2525 | } | |
2526 | } | |
2527 | spin_unlock(®_requests_lock); | |
2528 | ||
2529 | mutex_unlock(®_mutex); | |
2530 | mutex_unlock(&cfg80211_mutex); | |
2531 | } |