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