Root/
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. |
3 | * Copyright 2005-2006, Devicescape Software, Inc. |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> |
5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as |
9 | * published by the Free Software Foundation. |
10 | */ |
11 | |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure |
14 | * |
15 | * The usual implementation is for a driver to read a device EEPROM to |
16 | * determine which regulatory domain it should be operating under, then |
17 | * looking up the allowable channels in a driver-local table and finally |
18 | * registering those channels in the wiphy structure. |
19 | * |
20 | * Another set of compliance enforcement is for drivers to use their |
21 | * own compliance limits which can be stored on the EEPROM. The host |
22 | * driver or firmware may ensure these are used. |
23 | * |
24 | * In addition to all this we provide an extra layer of regulatory |
25 | * conformance. For drivers which do not have any regulatory |
26 | * information CRDA provides the complete regulatory solution. |
27 | * For others it provides a community effort on further restrictions |
28 | * to enhance compliance. |
29 | * |
30 | * Note: When number of rules --> infinity we will not be able to |
31 | * index on alpha2 any more, instead we'll probably have to |
32 | * rely on some SHA1 checksum of the regdomain for example. |
33 | * |
34 | */ |
35 | |
36 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
37 | |
38 | #include <linux/kernel.h> |
39 | #include <linux/slab.h> |
40 | #include <linux/list.h> |
41 | #include <linux/random.h> |
42 | #include <linux/ctype.h> |
43 | #include <linux/nl80211.h> |
44 | #include <linux/platform_device.h> |
45 | #include <net/cfg80211.h> |
46 | #include "core.h" |
47 | #include "reg.h" |
48 | #include "regdb.h" |
49 | #include "nl80211.h" |
50 | |
51 | #ifdef CONFIG_CFG80211_REG_DEBUG |
52 | #define REG_DBG_PRINT(format, args...) \ |
53 | do { \ |
54 | printk(KERN_DEBUG pr_fmt(format), ##args); \ |
55 | } while (0) |
56 | #else |
57 | #define REG_DBG_PRINT(args...) |
58 | #endif |
59 | |
60 | /* Receipt of information from last regulatory request */ |
61 | static struct regulatory_request *last_request; |
62 | |
63 | /* To trigger userspace events */ |
64 | static struct platform_device *reg_pdev; |
65 | |
66 | static struct device_type reg_device_type = { |
67 | .uevent = reg_device_uevent, |
68 | }; |
69 | |
70 | /* |
71 | * Central wireless core regulatory domains, we only need two, |
72 | * the current one and a world regulatory domain in case we have no |
73 | * information to give us an alpha2 |
74 | */ |
75 | const struct ieee80211_regdomain *cfg80211_regdomain; |
76 | |
77 | /* |
78 | * Protects static reg.c components: |
79 | * - cfg80211_world_regdom |
80 | * - cfg80211_regdom |
81 | * - last_request |
82 | */ |
83 | static DEFINE_MUTEX(reg_mutex); |
84 | |
85 | static inline void assert_reg_lock(void) |
86 | { |
87 | lockdep_assert_held(®_mutex); |
88 | } |
89 | |
90 | /* Used to queue up regulatory hints */ |
91 | static LIST_HEAD(reg_requests_list); |
92 | static spinlock_t reg_requests_lock; |
93 | |
94 | /* Used to queue up beacon hints for review */ |
95 | static LIST_HEAD(reg_pending_beacons); |
96 | static spinlock_t reg_pending_beacons_lock; |
97 | |
98 | /* Used to keep track of processed beacon hints */ |
99 | static LIST_HEAD(reg_beacon_list); |
100 | |
101 | struct reg_beacon { |
102 | struct list_head list; |
103 | struct ieee80211_channel chan; |
104 | }; |
105 | |
106 | static void reg_todo(struct work_struct *work); |
107 | static DECLARE_WORK(reg_work, reg_todo); |
108 | |
109 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
110 | static const struct ieee80211_regdomain world_regdom = { |
111 | .n_reg_rules = 5, |
112 | .alpha2 = "00", |
113 | .reg_rules = { |
114 | /* IEEE 802.11b/g, channels 1..11 */ |
115 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), |
116 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
117 | * channel fits here. */ |
118 | REG_RULE(2467-10, 2472+10, 20, 6, 20, |
119 | NL80211_RRF_PASSIVE_SCAN | |
120 | NL80211_RRF_NO_IBSS), |
121 | /* IEEE 802.11 channel 14 - Only JP enables |
122 | * this and for 802.11b only */ |
123 | REG_RULE(2484-10, 2484+10, 20, 6, 20, |
124 | NL80211_RRF_PASSIVE_SCAN | |
125 | NL80211_RRF_NO_IBSS | |
126 | NL80211_RRF_NO_OFDM), |
127 | /* IEEE 802.11a, channel 36..48 */ |
128 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
129 | NL80211_RRF_PASSIVE_SCAN | |
130 | NL80211_RRF_NO_IBSS), |
131 | |
132 | /* NB: 5260 MHz - 5700 MHz requies DFS */ |
133 | |
134 | /* IEEE 802.11a, channel 149..165 */ |
135 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
136 | NL80211_RRF_PASSIVE_SCAN | |
137 | NL80211_RRF_NO_IBSS), |
138 | } |
139 | }; |
140 | |
141 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
142 | &world_regdom; |
143 | |
144 | static char *ieee80211_regdom = "00"; |
145 | static char user_alpha2[2]; |
146 | |
147 | module_param(ieee80211_regdom, charp, 0444); |
148 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); |
149 | |
150 | static void reset_regdomains(void) |
151 | { |
152 | /* avoid freeing static information or freeing something twice */ |
153 | if (cfg80211_regdomain == cfg80211_world_regdom) |
154 | cfg80211_regdomain = NULL; |
155 | if (cfg80211_world_regdom == &world_regdom) |
156 | cfg80211_world_regdom = NULL; |
157 | if (cfg80211_regdomain == &world_regdom) |
158 | cfg80211_regdomain = NULL; |
159 | |
160 | kfree(cfg80211_regdomain); |
161 | kfree(cfg80211_world_regdom); |
162 | |
163 | cfg80211_world_regdom = &world_regdom; |
164 | cfg80211_regdomain = NULL; |
165 | } |
166 | |
167 | /* |
168 | * Dynamic world regulatory domain requested by the wireless |
169 | * core upon initialization |
170 | */ |
171 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
172 | { |
173 | BUG_ON(!last_request); |
174 | |
175 | reset_regdomains(); |
176 | |
177 | cfg80211_world_regdom = rd; |
178 | cfg80211_regdomain = rd; |
179 | } |
180 | |
181 | bool is_world_regdom(const char *alpha2) |
182 | { |
183 | if (!alpha2) |
184 | return false; |
185 | if (alpha2[0] == '0' && alpha2[1] == '0') |
186 | return true; |
187 | return false; |
188 | } |
189 | |
190 | static bool is_alpha2_set(const char *alpha2) |
191 | { |
192 | if (!alpha2) |
193 | return false; |
194 | if (alpha2[0] != 0 && alpha2[1] != 0) |
195 | return true; |
196 | return false; |
197 | } |
198 | |
199 | static bool is_unknown_alpha2(const char *alpha2) |
200 | { |
201 | if (!alpha2) |
202 | return false; |
203 | /* |
204 | * Special case where regulatory domain was built by driver |
205 | * but a specific alpha2 cannot be determined |
206 | */ |
207 | if (alpha2[0] == '9' && alpha2[1] == '9') |
208 | return true; |
209 | return false; |
210 | } |
211 | |
212 | static bool is_intersected_alpha2(const char *alpha2) |
213 | { |
214 | if (!alpha2) |
215 | return false; |
216 | /* |
217 | * Special case where regulatory domain is the |
218 | * result of an intersection between two regulatory domain |
219 | * structures |
220 | */ |
221 | if (alpha2[0] == '9' && alpha2[1] == '8') |
222 | return true; |
223 | return false; |
224 | } |
225 | |
226 | static bool is_an_alpha2(const char *alpha2) |
227 | { |
228 | if (!alpha2) |
229 | return false; |
230 | if (isalpha(alpha2[0]) && isalpha(alpha2[1])) |
231 | return true; |
232 | return false; |
233 | } |
234 | |
235 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
236 | { |
237 | if (!alpha2_x || !alpha2_y) |
238 | return false; |
239 | if (alpha2_x[0] == alpha2_y[0] && |
240 | alpha2_x[1] == alpha2_y[1]) |
241 | return true; |
242 | return false; |
243 | } |
244 | |
245 | static bool regdom_changes(const char *alpha2) |
246 | { |
247 | assert_cfg80211_lock(); |
248 | |
249 | if (!cfg80211_regdomain) |
250 | return true; |
251 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) |
252 | return false; |
253 | return true; |
254 | } |
255 | |
256 | /* |
257 | * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets |
258 | * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER |
259 | * has ever been issued. |
260 | */ |
261 | static bool is_user_regdom_saved(void) |
262 | { |
263 | if (user_alpha2[0] == '9' && user_alpha2[1] == '7') |
264 | return false; |
265 | |
266 | /* This would indicate a mistake on the design */ |
267 | if (WARN((!is_world_regdom(user_alpha2) && |
268 | !is_an_alpha2(user_alpha2)), |
269 | "Unexpected user alpha2: %c%c\n", |
270 | user_alpha2[0], |
271 | user_alpha2[1])) |
272 | return false; |
273 | |
274 | return true; |
275 | } |
276 | |
277 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
278 | const struct ieee80211_regdomain *src_regd) |
279 | { |
280 | struct ieee80211_regdomain *regd; |
281 | int size_of_regd = 0; |
282 | unsigned int i; |
283 | |
284 | size_of_regd = sizeof(struct ieee80211_regdomain) + |
285 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); |
286 | |
287 | regd = kzalloc(size_of_regd, GFP_KERNEL); |
288 | if (!regd) |
289 | return -ENOMEM; |
290 | |
291 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); |
292 | |
293 | for (i = 0; i < src_regd->n_reg_rules; i++) |
294 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], |
295 | sizeof(struct ieee80211_reg_rule)); |
296 | |
297 | *dst_regd = regd; |
298 | return 0; |
299 | } |
300 | |
301 | #ifdef CONFIG_CFG80211_INTERNAL_REGDB |
302 | struct reg_regdb_search_request { |
303 | char alpha2[2]; |
304 | struct list_head list; |
305 | }; |
306 | |
307 | static LIST_HEAD(reg_regdb_search_list); |
308 | static DEFINE_MUTEX(reg_regdb_search_mutex); |
309 | |
310 | static void reg_regdb_search(struct work_struct *work) |
311 | { |
312 | struct reg_regdb_search_request *request; |
313 | const struct ieee80211_regdomain *curdom, *regdom; |
314 | int i, r; |
315 | |
316 | mutex_lock(®_regdb_search_mutex); |
317 | while (!list_empty(®_regdb_search_list)) { |
318 | request = list_first_entry(®_regdb_search_list, |
319 | struct reg_regdb_search_request, |
320 | list); |
321 | list_del(&request->list); |
322 | |
323 | for (i=0; i<reg_regdb_size; i++) { |
324 | curdom = reg_regdb[i]; |
325 | |
326 | if (!memcmp(request->alpha2, curdom->alpha2, 2)) { |
327 | r = reg_copy_regd(®dom, curdom); |
328 | if (r) |
329 | break; |
330 | mutex_lock(&cfg80211_mutex); |
331 | set_regdom(regdom); |
332 | mutex_unlock(&cfg80211_mutex); |
333 | break; |
334 | } |
335 | } |
336 | |
337 | kfree(request); |
338 | } |
339 | mutex_unlock(®_regdb_search_mutex); |
340 | } |
341 | |
342 | static DECLARE_WORK(reg_regdb_work, reg_regdb_search); |
343 | |
344 | static void reg_regdb_query(const char *alpha2) |
345 | { |
346 | struct reg_regdb_search_request *request; |
347 | |
348 | if (!alpha2) |
349 | return; |
350 | |
351 | request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL); |
352 | if (!request) |
353 | return; |
354 | |
355 | memcpy(request->alpha2, alpha2, 2); |
356 | |
357 | mutex_lock(®_regdb_search_mutex); |
358 | list_add_tail(&request->list, ®_regdb_search_list); |
359 | mutex_unlock(®_regdb_search_mutex); |
360 | |
361 | schedule_work(®_regdb_work); |
362 | } |
363 | #else |
364 | static inline void reg_regdb_query(const char *alpha2) {} |
365 | #endif /* CONFIG_CFG80211_INTERNAL_REGDB */ |
366 | |
367 | /* |
368 | * This lets us keep regulatory code which is updated on a regulatory |
369 | * basis in userspace. Country information is filled in by |
370 | * reg_device_uevent |
371 | */ |
372 | static int call_crda(const char *alpha2) |
373 | { |
374 | if (!is_world_regdom((char *) alpha2)) |
375 | pr_info("Calling CRDA for country: %c%c\n", |
376 | alpha2[0], alpha2[1]); |
377 | else |
378 | pr_info("Calling CRDA to update world regulatory domain\n"); |
379 | |
380 | /* query internal regulatory database (if it exists) */ |
381 | reg_regdb_query(alpha2); |
382 | |
383 | return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE); |
384 | } |
385 | |
386 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
387 | bool reg_is_valid_request(const char *alpha2) |
388 | { |
389 | assert_cfg80211_lock(); |
390 | |
391 | if (!last_request) |
392 | return false; |
393 | |
394 | return alpha2_equal(last_request->alpha2, alpha2); |
395 | } |
396 | |
397 | /* Sanity check on a regulatory rule */ |
398 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
399 | { |
400 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
401 | u32 freq_diff; |
402 | |
403 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
404 | return false; |
405 | |
406 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) |
407 | return false; |
408 | |
409 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; |
410 | |
411 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
412 | freq_range->max_bandwidth_khz > freq_diff) |
413 | return false; |
414 | |
415 | return true; |
416 | } |
417 | |
418 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
419 | { |
420 | const struct ieee80211_reg_rule *reg_rule = NULL; |
421 | unsigned int i; |
422 | |
423 | if (!rd->n_reg_rules) |
424 | return false; |
425 | |
426 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
427 | return false; |
428 | |
429 | for (i = 0; i < rd->n_reg_rules; i++) { |
430 | reg_rule = &rd->reg_rules[i]; |
431 | if (!is_valid_reg_rule(reg_rule)) |
432 | return false; |
433 | } |
434 | |
435 | return true; |
436 | } |
437 | |
438 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, |
439 | u32 center_freq_khz, |
440 | u32 bw_khz) |
441 | { |
442 | u32 start_freq_khz, end_freq_khz; |
443 | |
444 | start_freq_khz = center_freq_khz - (bw_khz/2); |
445 | end_freq_khz = center_freq_khz + (bw_khz/2); |
446 | |
447 | if (start_freq_khz >= freq_range->start_freq_khz && |
448 | end_freq_khz <= freq_range->end_freq_khz) |
449 | return true; |
450 | |
451 | return false; |
452 | } |
453 | |
454 | /** |
455 | * freq_in_rule_band - tells us if a frequency is in a frequency band |
456 | * @freq_range: frequency rule we want to query |
457 | * @freq_khz: frequency we are inquiring about |
458 | * |
459 | * This lets us know if a specific frequency rule is or is not relevant to |
460 | * a specific frequency's band. Bands are device specific and artificial |
461 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is |
462 | * safe for now to assume that a frequency rule should not be part of a |
463 | * frequency's band if the start freq or end freq are off by more than 2 GHz. |
464 | * This resolution can be lowered and should be considered as we add |
465 | * regulatory rule support for other "bands". |
466 | **/ |
467 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, |
468 | u32 freq_khz) |
469 | { |
470 | #define ONE_GHZ_IN_KHZ 1000000 |
471 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) |
472 | return true; |
473 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) |
474 | return true; |
475 | return false; |
476 | #undef ONE_GHZ_IN_KHZ |
477 | } |
478 | |
479 | /* |
480 | * Helper for regdom_intersect(), this does the real |
481 | * mathematical intersection fun |
482 | */ |
483 | static int reg_rules_intersect( |
484 | const struct ieee80211_reg_rule *rule1, |
485 | const struct ieee80211_reg_rule *rule2, |
486 | struct ieee80211_reg_rule *intersected_rule) |
487 | { |
488 | const struct ieee80211_freq_range *freq_range1, *freq_range2; |
489 | struct ieee80211_freq_range *freq_range; |
490 | const struct ieee80211_power_rule *power_rule1, *power_rule2; |
491 | struct ieee80211_power_rule *power_rule; |
492 | u32 freq_diff; |
493 | |
494 | freq_range1 = &rule1->freq_range; |
495 | freq_range2 = &rule2->freq_range; |
496 | freq_range = &intersected_rule->freq_range; |
497 | |
498 | power_rule1 = &rule1->power_rule; |
499 | power_rule2 = &rule2->power_rule; |
500 | power_rule = &intersected_rule->power_rule; |
501 | |
502 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, |
503 | freq_range2->start_freq_khz); |
504 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, |
505 | freq_range2->end_freq_khz); |
506 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, |
507 | freq_range2->max_bandwidth_khz); |
508 | |
509 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; |
510 | if (freq_range->max_bandwidth_khz > freq_diff) |
511 | freq_range->max_bandwidth_khz = freq_diff; |
512 | |
513 | power_rule->max_eirp = min(power_rule1->max_eirp, |
514 | power_rule2->max_eirp); |
515 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, |
516 | power_rule2->max_antenna_gain); |
517 | |
518 | intersected_rule->flags = (rule1->flags | rule2->flags); |
519 | |
520 | if (!is_valid_reg_rule(intersected_rule)) |
521 | return -EINVAL; |
522 | |
523 | return 0; |
524 | } |
525 | |
526 | /** |
527 | * regdom_intersect - do the intersection between two regulatory domains |
528 | * @rd1: first regulatory domain |
529 | * @rd2: second regulatory domain |
530 | * |
531 | * Use this function to get the intersection between two regulatory domains. |
532 | * Once completed we will mark the alpha2 for the rd as intersected, "98", |
533 | * as no one single alpha2 can represent this regulatory domain. |
534 | * |
535 | * Returns a pointer to the regulatory domain structure which will hold the |
536 | * resulting intersection of rules between rd1 and rd2. We will |
537 | * kzalloc() this structure for you. |
538 | */ |
539 | static struct ieee80211_regdomain *regdom_intersect( |
540 | const struct ieee80211_regdomain *rd1, |
541 | const struct ieee80211_regdomain *rd2) |
542 | { |
543 | int r, size_of_regd; |
544 | unsigned int x, y; |
545 | unsigned int num_rules = 0, rule_idx = 0; |
546 | const struct ieee80211_reg_rule *rule1, *rule2; |
547 | struct ieee80211_reg_rule *intersected_rule; |
548 | struct ieee80211_regdomain *rd; |
549 | /* This is just a dummy holder to help us count */ |
550 | struct ieee80211_reg_rule irule; |
551 | |
552 | /* Uses the stack temporarily for counter arithmetic */ |
553 | intersected_rule = &irule; |
554 | |
555 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); |
556 | |
557 | if (!rd1 || !rd2) |
558 | return NULL; |
559 | |
560 | /* |
561 | * First we get a count of the rules we'll need, then we actually |
562 | * build them. This is to so we can malloc() and free() a |
563 | * regdomain once. The reason we use reg_rules_intersect() here |
564 | * is it will return -EINVAL if the rule computed makes no sense. |
565 | * All rules that do check out OK are valid. |
566 | */ |
567 | |
568 | for (x = 0; x < rd1->n_reg_rules; x++) { |
569 | rule1 = &rd1->reg_rules[x]; |
570 | for (y = 0; y < rd2->n_reg_rules; y++) { |
571 | rule2 = &rd2->reg_rules[y]; |
572 | if (!reg_rules_intersect(rule1, rule2, |
573 | intersected_rule)) |
574 | num_rules++; |
575 | memset(intersected_rule, 0, |
576 | sizeof(struct ieee80211_reg_rule)); |
577 | } |
578 | } |
579 | |
580 | if (!num_rules) |
581 | return NULL; |
582 | |
583 | size_of_regd = sizeof(struct ieee80211_regdomain) + |
584 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); |
585 | |
586 | rd = kzalloc(size_of_regd, GFP_KERNEL); |
587 | if (!rd) |
588 | return NULL; |
589 | |
590 | for (x = 0; x < rd1->n_reg_rules; x++) { |
591 | rule1 = &rd1->reg_rules[x]; |
592 | for (y = 0; y < rd2->n_reg_rules; y++) { |
593 | rule2 = &rd2->reg_rules[y]; |
594 | /* |
595 | * This time around instead of using the stack lets |
596 | * write to the target rule directly saving ourselves |
597 | * a memcpy() |
598 | */ |
599 | intersected_rule = &rd->reg_rules[rule_idx]; |
600 | r = reg_rules_intersect(rule1, rule2, |
601 | intersected_rule); |
602 | /* |
603 | * No need to memset here the intersected rule here as |
604 | * we're not using the stack anymore |
605 | */ |
606 | if (r) |
607 | continue; |
608 | rule_idx++; |
609 | } |
610 | } |
611 | |
612 | if (rule_idx != num_rules) { |
613 | kfree(rd); |
614 | return NULL; |
615 | } |
616 | |
617 | rd->n_reg_rules = num_rules; |
618 | rd->alpha2[0] = '9'; |
619 | rd->alpha2[1] = '8'; |
620 | |
621 | return rd; |
622 | } |
623 | |
624 | /* |
625 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may |
626 | * want to just have the channel structure use these |
627 | */ |
628 | static u32 map_regdom_flags(u32 rd_flags) |
629 | { |
630 | u32 channel_flags = 0; |
631 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) |
632 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; |
633 | if (rd_flags & NL80211_RRF_NO_IBSS) |
634 | channel_flags |= IEEE80211_CHAN_NO_IBSS; |
635 | if (rd_flags & NL80211_RRF_DFS) |
636 | channel_flags |= IEEE80211_CHAN_RADAR; |
637 | return channel_flags; |
638 | } |
639 | |
640 | static int freq_reg_info_regd(struct wiphy *wiphy, |
641 | u32 center_freq, |
642 | u32 desired_bw_khz, |
643 | const struct ieee80211_reg_rule **reg_rule, |
644 | const struct ieee80211_regdomain *custom_regd) |
645 | { |
646 | int i; |
647 | bool band_rule_found = false; |
648 | const struct ieee80211_regdomain *regd; |
649 | bool bw_fits = false; |
650 | |
651 | if (!desired_bw_khz) |
652 | desired_bw_khz = MHZ_TO_KHZ(20); |
653 | |
654 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
655 | |
656 | /* |
657 | * Follow the driver's regulatory domain, if present, unless a country |
658 | * IE has been processed or a user wants to help complaince further |
659 | */ |
660 | if (!custom_regd && |
661 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
662 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && |
663 | wiphy->regd) |
664 | regd = wiphy->regd; |
665 | |
666 | if (!regd) |
667 | return -EINVAL; |
668 | |
669 | for (i = 0; i < regd->n_reg_rules; i++) { |
670 | const struct ieee80211_reg_rule *rr; |
671 | const struct ieee80211_freq_range *fr = NULL; |
672 | const struct ieee80211_power_rule *pr = NULL; |
673 | |
674 | rr = ®d->reg_rules[i]; |
675 | fr = &rr->freq_range; |
676 | pr = &rr->power_rule; |
677 | |
678 | /* |
679 | * We only need to know if one frequency rule was |
680 | * was in center_freq's band, that's enough, so lets |
681 | * not overwrite it once found |
682 | */ |
683 | if (!band_rule_found) |
684 | band_rule_found = freq_in_rule_band(fr, center_freq); |
685 | |
686 | bw_fits = reg_does_bw_fit(fr, |
687 | center_freq, |
688 | desired_bw_khz); |
689 | |
690 | if (band_rule_found && bw_fits) { |
691 | *reg_rule = rr; |
692 | return 0; |
693 | } |
694 | } |
695 | |
696 | if (!band_rule_found) |
697 | return -ERANGE; |
698 | |
699 | return -EINVAL; |
700 | } |
701 | |
702 | int freq_reg_info(struct wiphy *wiphy, |
703 | u32 center_freq, |
704 | u32 desired_bw_khz, |
705 | const struct ieee80211_reg_rule **reg_rule) |
706 | { |
707 | assert_cfg80211_lock(); |
708 | return freq_reg_info_regd(wiphy, |
709 | center_freq, |
710 | desired_bw_khz, |
711 | reg_rule, |
712 | NULL); |
713 | } |
714 | EXPORT_SYMBOL(freq_reg_info); |
715 | |
716 | #ifdef CONFIG_CFG80211_REG_DEBUG |
717 | static const char *reg_initiator_name(enum nl80211_reg_initiator initiator) |
718 | { |
719 | switch (initiator) { |
720 | case NL80211_REGDOM_SET_BY_CORE: |
721 | return "Set by core"; |
722 | case NL80211_REGDOM_SET_BY_USER: |
723 | return "Set by user"; |
724 | case NL80211_REGDOM_SET_BY_DRIVER: |
725 | return "Set by driver"; |
726 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
727 | return "Set by country IE"; |
728 | default: |
729 | WARN_ON(1); |
730 | return "Set by bug"; |
731 | } |
732 | } |
733 | |
734 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, |
735 | u32 desired_bw_khz, |
736 | const struct ieee80211_reg_rule *reg_rule) |
737 | { |
738 | const struct ieee80211_power_rule *power_rule; |
739 | const struct ieee80211_freq_range *freq_range; |
740 | char max_antenna_gain[32]; |
741 | |
742 | power_rule = ®_rule->power_rule; |
743 | freq_range = ®_rule->freq_range; |
744 | |
745 | if (!power_rule->max_antenna_gain) |
746 | snprintf(max_antenna_gain, 32, "N/A"); |
747 | else |
748 | snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain); |
749 | |
750 | REG_DBG_PRINT("Updating information on frequency %d MHz " |
751 | "for a %d MHz width channel with regulatory rule:\n", |
752 | chan->center_freq, |
753 | KHZ_TO_MHZ(desired_bw_khz)); |
754 | |
755 | REG_DBG_PRINT("%d KHz - %d KHz @ KHz), (%s mBi, %d mBm)\n", |
756 | freq_range->start_freq_khz, |
757 | freq_range->end_freq_khz, |
758 | max_antenna_gain, |
759 | power_rule->max_eirp); |
760 | } |
761 | #else |
762 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, |
763 | u32 desired_bw_khz, |
764 | const struct ieee80211_reg_rule *reg_rule) |
765 | { |
766 | return; |
767 | } |
768 | #endif |
769 | |
770 | /* |
771 | * Note that right now we assume the desired channel bandwidth |
772 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz |
773 | * per channel, the primary and the extension channel). To support |
774 | * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a |
775 | * new ieee80211_channel.target_bw and re run the regulatory check |
776 | * on the wiphy with the target_bw specified. Then we can simply use |
777 | * that below for the desired_bw_khz below. |
778 | */ |
779 | static void handle_channel(struct wiphy *wiphy, |
780 | enum nl80211_reg_initiator initiator, |
781 | enum ieee80211_band band, |
782 | unsigned int chan_idx) |
783 | { |
784 | int r; |
785 | u32 flags, bw_flags = 0; |
786 | u32 desired_bw_khz = MHZ_TO_KHZ(20); |
787 | const struct ieee80211_reg_rule *reg_rule = NULL; |
788 | const struct ieee80211_power_rule *power_rule = NULL; |
789 | const struct ieee80211_freq_range *freq_range = NULL; |
790 | struct ieee80211_supported_band *sband; |
791 | struct ieee80211_channel *chan; |
792 | struct wiphy *request_wiphy = NULL; |
793 | |
794 | assert_cfg80211_lock(); |
795 | |
796 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
797 | |
798 | sband = wiphy->bands[band]; |
799 | BUG_ON(chan_idx >= sband->n_channels); |
800 | chan = &sband->channels[chan_idx]; |
801 | |
802 | flags = chan->orig_flags; |
803 | |
804 | r = freq_reg_info(wiphy, |
805 | MHZ_TO_KHZ(chan->center_freq), |
806 | desired_bw_khz, |
807 | ®_rule); |
808 | |
809 | if (r) { |
810 | /* |
811 | * We will disable all channels that do not match our |
812 | * received regulatory rule unless the hint is coming |
813 | * from a Country IE and the Country IE had no information |
814 | * about a band. The IEEE 802.11 spec allows for an AP |
815 | * to send only a subset of the regulatory rules allowed, |
816 | * so an AP in the US that only supports 2.4 GHz may only send |
817 | * a country IE with information for the 2.4 GHz band |
818 | * while 5 GHz is still supported. |
819 | */ |
820 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && |
821 | r == -ERANGE) |
822 | return; |
823 | |
824 | REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq); |
825 | chan->flags = IEEE80211_CHAN_DISABLED; |
826 | return; |
827 | } |
828 | |
829 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
830 | |
831 | power_rule = ®_rule->power_rule; |
832 | freq_range = ®_rule->freq_range; |
833 | |
834 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) |
835 | bw_flags = IEEE80211_CHAN_NO_HT40; |
836 | |
837 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
838 | request_wiphy && request_wiphy == wiphy && |
839 | request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
840 | /* |
841 | * This guarantees the driver's requested regulatory domain |
842 | * will always be used as a base for further regulatory |
843 | * settings |
844 | */ |
845 | chan->flags = chan->orig_flags = |
846 | map_regdom_flags(reg_rule->flags) | bw_flags; |
847 | chan->max_antenna_gain = chan->orig_mag = |
848 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); |
849 | chan->max_power = chan->orig_mpwr = |
850 | (int) MBM_TO_DBM(power_rule->max_eirp); |
851 | return; |
852 | } |
853 | |
854 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); |
855 | chan->max_antenna_gain = min(chan->orig_mag, |
856 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
857 | if (chan->orig_mpwr) |
858 | chan->max_power = min(chan->orig_mpwr, |
859 | (int) MBM_TO_DBM(power_rule->max_eirp)); |
860 | else |
861 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
862 | } |
863 | |
864 | static void handle_band(struct wiphy *wiphy, |
865 | enum ieee80211_band band, |
866 | enum nl80211_reg_initiator initiator) |
867 | { |
868 | unsigned int i; |
869 | struct ieee80211_supported_band *sband; |
870 | |
871 | BUG_ON(!wiphy->bands[band]); |
872 | sband = wiphy->bands[band]; |
873 | |
874 | for (i = 0; i < sband->n_channels; i++) |
875 | handle_channel(wiphy, initiator, band, i); |
876 | } |
877 | |
878 | static bool ignore_reg_update(struct wiphy *wiphy, |
879 | enum nl80211_reg_initiator initiator) |
880 | { |
881 | if (!last_request) { |
882 | REG_DBG_PRINT("Ignoring regulatory request %s since " |
883 | "last_request is not set\n", |
884 | reg_initiator_name(initiator)); |
885 | return true; |
886 | } |
887 | |
888 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
889 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { |
890 | REG_DBG_PRINT("Ignoring regulatory request %s " |
891 | "since the driver uses its own custom " |
892 | "regulatory domain ", |
893 | reg_initiator_name(initiator)); |
894 | return true; |
895 | } |
896 | |
897 | /* |
898 | * wiphy->regd will be set once the device has its own |
899 | * desired regulatory domain set |
900 | */ |
901 | if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && |
902 | initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
903 | !is_world_regdom(last_request->alpha2)) { |
904 | REG_DBG_PRINT("Ignoring regulatory request %s " |
905 | "since the driver requires its own regulaotry " |
906 | "domain to be set first", |
907 | reg_initiator_name(initiator)); |
908 | return true; |
909 | } |
910 | |
911 | return false; |
912 | } |
913 | |
914 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
915 | { |
916 | struct cfg80211_registered_device *rdev; |
917 | |
918 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
919 | wiphy_update_regulatory(&rdev->wiphy, initiator); |
920 | } |
921 | |
922 | static void handle_reg_beacon(struct wiphy *wiphy, |
923 | unsigned int chan_idx, |
924 | struct reg_beacon *reg_beacon) |
925 | { |
926 | struct ieee80211_supported_band *sband; |
927 | struct ieee80211_channel *chan; |
928 | bool channel_changed = false; |
929 | struct ieee80211_channel chan_before; |
930 | |
931 | assert_cfg80211_lock(); |
932 | |
933 | sband = wiphy->bands[reg_beacon->chan.band]; |
934 | chan = &sband->channels[chan_idx]; |
935 | |
936 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) |
937 | return; |
938 | |
939 | if (chan->beacon_found) |
940 | return; |
941 | |
942 | chan->beacon_found = true; |
943 | |
944 | if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) |
945 | return; |
946 | |
947 | chan_before.center_freq = chan->center_freq; |
948 | chan_before.flags = chan->flags; |
949 | |
950 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { |
951 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; |
952 | channel_changed = true; |
953 | } |
954 | |
955 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { |
956 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; |
957 | channel_changed = true; |
958 | } |
959 | |
960 | if (channel_changed) |
961 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); |
962 | } |
963 | |
964 | /* |
965 | * Called when a scan on a wiphy finds a beacon on |
966 | * new channel |
967 | */ |
968 | static void wiphy_update_new_beacon(struct wiphy *wiphy, |
969 | struct reg_beacon *reg_beacon) |
970 | { |
971 | unsigned int i; |
972 | struct ieee80211_supported_band *sband; |
973 | |
974 | assert_cfg80211_lock(); |
975 | |
976 | if (!wiphy->bands[reg_beacon->chan.band]) |
977 | return; |
978 | |
979 | sband = wiphy->bands[reg_beacon->chan.band]; |
980 | |
981 | for (i = 0; i < sband->n_channels; i++) |
982 | handle_reg_beacon(wiphy, i, reg_beacon); |
983 | } |
984 | |
985 | /* |
986 | * Called upon reg changes or a new wiphy is added |
987 | */ |
988 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) |
989 | { |
990 | unsigned int i; |
991 | struct ieee80211_supported_band *sband; |
992 | struct reg_beacon *reg_beacon; |
993 | |
994 | assert_cfg80211_lock(); |
995 | |
996 | if (list_empty(®_beacon_list)) |
997 | return; |
998 | |
999 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { |
1000 | if (!wiphy->bands[reg_beacon->chan.band]) |
1001 | continue; |
1002 | sband = wiphy->bands[reg_beacon->chan.band]; |
1003 | for (i = 0; i < sband->n_channels; i++) |
1004 | handle_reg_beacon(wiphy, i, reg_beacon); |
1005 | } |
1006 | } |
1007 | |
1008 | static bool reg_is_world_roaming(struct wiphy *wiphy) |
1009 | { |
1010 | if (is_world_regdom(cfg80211_regdomain->alpha2) || |
1011 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) |
1012 | return true; |
1013 | if (last_request && |
1014 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
1015 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) |
1016 | return true; |
1017 | return false; |
1018 | } |
1019 | |
1020 | /* Reap the advantages of previously found beacons */ |
1021 | static void reg_process_beacons(struct wiphy *wiphy) |
1022 | { |
1023 | /* |
1024 | * Means we are just firing up cfg80211, so no beacons would |
1025 | * have been processed yet. |
1026 | */ |
1027 | if (!last_request) |
1028 | return; |
1029 | if (!reg_is_world_roaming(wiphy)) |
1030 | return; |
1031 | wiphy_update_beacon_reg(wiphy); |
1032 | } |
1033 | |
1034 | static bool is_ht40_not_allowed(struct ieee80211_channel *chan) |
1035 | { |
1036 | if (!chan) |
1037 | return true; |
1038 | if (chan->flags & IEEE80211_CHAN_DISABLED) |
1039 | return true; |
1040 | /* This would happen when regulatory rules disallow HT40 completely */ |
1041 | if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) |
1042 | return true; |
1043 | return false; |
1044 | } |
1045 | |
1046 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, |
1047 | enum ieee80211_band band, |
1048 | unsigned int chan_idx) |
1049 | { |
1050 | struct ieee80211_supported_band *sband; |
1051 | struct ieee80211_channel *channel; |
1052 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; |
1053 | unsigned int i; |
1054 | |
1055 | assert_cfg80211_lock(); |
1056 | |
1057 | sband = wiphy->bands[band]; |
1058 | BUG_ON(chan_idx >= sband->n_channels); |
1059 | channel = &sband->channels[chan_idx]; |
1060 | |
1061 | if (is_ht40_not_allowed(channel)) { |
1062 | channel->flags |= IEEE80211_CHAN_NO_HT40; |
1063 | return; |
1064 | } |
1065 | |
1066 | /* |
1067 | * We need to ensure the extension channels exist to |
1068 | * be able to use HT40- or HT40+, this finds them (or not) |
1069 | */ |
1070 | for (i = 0; i < sband->n_channels; i++) { |
1071 | struct ieee80211_channel *c = &sband->channels[i]; |
1072 | if (c->center_freq == (channel->center_freq - 20)) |
1073 | channel_before = c; |
1074 | if (c->center_freq == (channel->center_freq + 20)) |
1075 | channel_after = c; |
1076 | } |
1077 | |
1078 | /* |
1079 | * Please note that this assumes target bandwidth is 20 MHz, |
1080 | * if that ever changes we also need to change the below logic |
1081 | * to include that as well. |
1082 | */ |
1083 | if (is_ht40_not_allowed(channel_before)) |
1084 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; |
1085 | else |
1086 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; |
1087 | |
1088 | if (is_ht40_not_allowed(channel_after)) |
1089 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; |
1090 | else |
1091 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; |
1092 | } |
1093 | |
1094 | static void reg_process_ht_flags_band(struct wiphy *wiphy, |
1095 | enum ieee80211_band band) |
1096 | { |
1097 | unsigned int i; |
1098 | struct ieee80211_supported_band *sband; |
1099 | |
1100 | BUG_ON(!wiphy->bands[band]); |
1101 | sband = wiphy->bands[band]; |
1102 | |
1103 | for (i = 0; i < sband->n_channels; i++) |
1104 | reg_process_ht_flags_channel(wiphy, band, i); |
1105 | } |
1106 | |
1107 | static void reg_process_ht_flags(struct wiphy *wiphy) |
1108 | { |
1109 | enum ieee80211_band band; |
1110 | |
1111 | if (!wiphy) |
1112 | return; |
1113 | |
1114 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
1115 | if (wiphy->bands[band]) |
1116 | reg_process_ht_flags_band(wiphy, band); |
1117 | } |
1118 | |
1119 | } |
1120 | |
1121 | void wiphy_update_regulatory(struct wiphy *wiphy, |
1122 | enum nl80211_reg_initiator initiator) |
1123 | { |
1124 | enum ieee80211_band band; |
1125 | |
1126 | if (ignore_reg_update(wiphy, initiator)) |
1127 | goto out; |
1128 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
1129 | if (wiphy->bands[band]) |
1130 | handle_band(wiphy, band, initiator); |
1131 | } |
1132 | out: |
1133 | reg_process_beacons(wiphy); |
1134 | reg_process_ht_flags(wiphy); |
1135 | if (wiphy->reg_notifier) |
1136 | wiphy->reg_notifier(wiphy, last_request); |
1137 | } |
1138 | |
1139 | static void handle_channel_custom(struct wiphy *wiphy, |
1140 | enum ieee80211_band band, |
1141 | unsigned int chan_idx, |
1142 | const struct ieee80211_regdomain *regd) |
1143 | { |
1144 | int r; |
1145 | u32 desired_bw_khz = MHZ_TO_KHZ(20); |
1146 | u32 bw_flags = 0; |
1147 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1148 | const struct ieee80211_power_rule *power_rule = NULL; |
1149 | const struct ieee80211_freq_range *freq_range = NULL; |
1150 | struct ieee80211_supported_band *sband; |
1151 | struct ieee80211_channel *chan; |
1152 | |
1153 | assert_reg_lock(); |
1154 | |
1155 | sband = wiphy->bands[band]; |
1156 | BUG_ON(chan_idx >= sband->n_channels); |
1157 | chan = &sband->channels[chan_idx]; |
1158 | |
1159 | r = freq_reg_info_regd(wiphy, |
1160 | MHZ_TO_KHZ(chan->center_freq), |
1161 | desired_bw_khz, |
1162 | ®_rule, |
1163 | regd); |
1164 | |
1165 | if (r) { |
1166 | REG_DBG_PRINT("Disabling freq %d MHz as custom " |
1167 | "regd has no rule that fits a %d MHz " |
1168 | "wide channel\n", |
1169 | chan->center_freq, |
1170 | KHZ_TO_MHZ(desired_bw_khz)); |
1171 | chan->flags = IEEE80211_CHAN_DISABLED; |
1172 | return; |
1173 | } |
1174 | |
1175 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
1176 | |
1177 | power_rule = ®_rule->power_rule; |
1178 | freq_range = ®_rule->freq_range; |
1179 | |
1180 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) |
1181 | bw_flags = IEEE80211_CHAN_NO_HT40; |
1182 | |
1183 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; |
1184 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); |
1185 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
1186 | } |
1187 | |
1188 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, |
1189 | const struct ieee80211_regdomain *regd) |
1190 | { |
1191 | unsigned int i; |
1192 | struct ieee80211_supported_band *sband; |
1193 | |
1194 | BUG_ON(!wiphy->bands[band]); |
1195 | sband = wiphy->bands[band]; |
1196 | |
1197 | for (i = 0; i < sband->n_channels; i++) |
1198 | handle_channel_custom(wiphy, band, i, regd); |
1199 | } |
1200 | |
1201 | /* Used by drivers prior to wiphy registration */ |
1202 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, |
1203 | const struct ieee80211_regdomain *regd) |
1204 | { |
1205 | enum ieee80211_band band; |
1206 | unsigned int bands_set = 0; |
1207 | |
1208 | mutex_lock(®_mutex); |
1209 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
1210 | if (!wiphy->bands[band]) |
1211 | continue; |
1212 | handle_band_custom(wiphy, band, regd); |
1213 | bands_set++; |
1214 | } |
1215 | mutex_unlock(®_mutex); |
1216 | |
1217 | /* |
1218 | * no point in calling this if it won't have any effect |
1219 | * on your device's supportd bands. |
1220 | */ |
1221 | WARN_ON(!bands_set); |
1222 | } |
1223 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1224 | |
1225 | /* |
1226 | * Return value which can be used by ignore_request() to indicate |
1227 | * it has been determined we should intersect two regulatory domains |
1228 | */ |
1229 | #define REG_INTERSECT 1 |
1230 | |
1231 | /* This has the logic which determines when a new request |
1232 | * should be ignored. */ |
1233 | static int ignore_request(struct wiphy *wiphy, |
1234 | struct regulatory_request *pending_request) |
1235 | { |
1236 | struct wiphy *last_wiphy = NULL; |
1237 | |
1238 | assert_cfg80211_lock(); |
1239 | |
1240 | /* All initial requests are respected */ |
1241 | if (!last_request) |
1242 | return 0; |
1243 | |
1244 | switch (pending_request->initiator) { |
1245 | case NL80211_REGDOM_SET_BY_CORE: |
1246 | return 0; |
1247 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
1248 | |
1249 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1250 | |
1251 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
1252 | return -EINVAL; |
1253 | if (last_request->initiator == |
1254 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
1255 | if (last_wiphy != wiphy) { |
1256 | /* |
1257 | * Two cards with two APs claiming different |
1258 | * Country IE alpha2s. We could |
1259 | * intersect them, but that seems unlikely |
1260 | * to be correct. Reject second one for now. |
1261 | */ |
1262 | if (regdom_changes(pending_request->alpha2)) |
1263 | return -EOPNOTSUPP; |
1264 | return -EALREADY; |
1265 | } |
1266 | /* |
1267 | * Two consecutive Country IE hints on the same wiphy. |
1268 | * This should be picked up early by the driver/stack |
1269 | */ |
1270 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
1271 | return 0; |
1272 | return -EALREADY; |
1273 | } |
1274 | return 0; |
1275 | case NL80211_REGDOM_SET_BY_DRIVER: |
1276 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { |
1277 | if (regdom_changes(pending_request->alpha2)) |
1278 | return 0; |
1279 | return -EALREADY; |
1280 | } |
1281 | |
1282 | /* |
1283 | * This would happen if you unplug and plug your card |
1284 | * back in or if you add a new device for which the previously |
1285 | * loaded card also agrees on the regulatory domain. |
1286 | */ |
1287 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
1288 | !regdom_changes(pending_request->alpha2)) |
1289 | return -EALREADY; |
1290 | |
1291 | return REG_INTERSECT; |
1292 | case NL80211_REGDOM_SET_BY_USER: |
1293 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) |
1294 | return REG_INTERSECT; |
1295 | /* |
1296 | * If the user knows better the user should set the regdom |
1297 | * to their country before the IE is picked up |
1298 | */ |
1299 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
1300 | last_request->intersect) |
1301 | return -EOPNOTSUPP; |
1302 | /* |
1303 | * Process user requests only after previous user/driver/core |
1304 | * requests have been processed |
1305 | */ |
1306 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1307 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || |
1308 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { |
1309 | if (regdom_changes(last_request->alpha2)) |
1310 | return -EAGAIN; |
1311 | } |
1312 | |
1313 | if (!regdom_changes(pending_request->alpha2)) |
1314 | return -EALREADY; |
1315 | |
1316 | return 0; |
1317 | } |
1318 | |
1319 | return -EINVAL; |
1320 | } |
1321 | |
1322 | static void reg_set_request_processed(void) |
1323 | { |
1324 | bool need_more_processing = false; |
1325 | |
1326 | last_request->processed = true; |
1327 | |
1328 | spin_lock(®_requests_lock); |
1329 | if (!list_empty(®_requests_list)) |
1330 | need_more_processing = true; |
1331 | spin_unlock(®_requests_lock); |
1332 | |
1333 | if (need_more_processing) |
1334 | schedule_work(®_work); |
1335 | } |
1336 | |
1337 | /** |
1338 | * __regulatory_hint - hint to the wireless core a regulatory domain |
1339 | * @wiphy: if the hint comes from country information from an AP, this |
1340 | * is required to be set to the wiphy that received the information |
1341 | * @pending_request: the regulatory request currently being processed |
1342 | * |
1343 | * The Wireless subsystem can use this function to hint to the wireless core |
1344 | * what it believes should be the current regulatory domain. |
1345 | * |
1346 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had |
1347 | * already been set or other standard error codes. |
1348 | * |
1349 | * Caller must hold &cfg80211_mutex and ®_mutex |
1350 | */ |
1351 | static int __regulatory_hint(struct wiphy *wiphy, |
1352 | struct regulatory_request *pending_request) |
1353 | { |
1354 | bool intersect = false; |
1355 | int r = 0; |
1356 | |
1357 | assert_cfg80211_lock(); |
1358 | |
1359 | r = ignore_request(wiphy, pending_request); |
1360 | |
1361 | if (r == REG_INTERSECT) { |
1362 | if (pending_request->initiator == |
1363 | NL80211_REGDOM_SET_BY_DRIVER) { |
1364 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
1365 | if (r) { |
1366 | kfree(pending_request); |
1367 | return r; |
1368 | } |
1369 | } |
1370 | intersect = true; |
1371 | } else if (r) { |
1372 | /* |
1373 | * If the regulatory domain being requested by the |
1374 | * driver has already been set just copy it to the |
1375 | * wiphy |
1376 | */ |
1377 | if (r == -EALREADY && |
1378 | pending_request->initiator == |
1379 | NL80211_REGDOM_SET_BY_DRIVER) { |
1380 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
1381 | if (r) { |
1382 | kfree(pending_request); |
1383 | return r; |
1384 | } |
1385 | r = -EALREADY; |
1386 | goto new_request; |
1387 | } |
1388 | kfree(pending_request); |
1389 | return r; |
1390 | } |
1391 | |
1392 | new_request: |
1393 | kfree(last_request); |
1394 | |
1395 | last_request = pending_request; |
1396 | last_request->intersect = intersect; |
1397 | |
1398 | pending_request = NULL; |
1399 | |
1400 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) { |
1401 | user_alpha2[0] = last_request->alpha2[0]; |
1402 | user_alpha2[1] = last_request->alpha2[1]; |
1403 | } |
1404 | |
1405 | /* When r == REG_INTERSECT we do need to call CRDA */ |
1406 | if (r < 0) { |
1407 | /* |
1408 | * Since CRDA will not be called in this case as we already |
1409 | * have applied the requested regulatory domain before we just |
1410 | * inform userspace we have processed the request |
1411 | */ |
1412 | if (r == -EALREADY) { |
1413 | nl80211_send_reg_change_event(last_request); |
1414 | reg_set_request_processed(); |
1415 | } |
1416 | return r; |
1417 | } |
1418 | |
1419 | return call_crda(last_request->alpha2); |
1420 | } |
1421 | |
1422 | /* This processes *all* regulatory hints */ |
1423 | static void reg_process_hint(struct regulatory_request *reg_request) |
1424 | { |
1425 | int r = 0; |
1426 | struct wiphy *wiphy = NULL; |
1427 | enum nl80211_reg_initiator initiator = reg_request->initiator; |
1428 | |
1429 | BUG_ON(!reg_request->alpha2); |
1430 | |
1431 | if (wiphy_idx_valid(reg_request->wiphy_idx)) |
1432 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); |
1433 | |
1434 | if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
1435 | !wiphy) { |
1436 | kfree(reg_request); |
1437 | return; |
1438 | } |
1439 | |
1440 | r = __regulatory_hint(wiphy, reg_request); |
1441 | /* This is required so that the orig_* parameters are saved */ |
1442 | if (r == -EALREADY && wiphy && |
1443 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) |
1444 | wiphy_update_regulatory(wiphy, initiator); |
1445 | } |
1446 | |
1447 | /* |
1448 | * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* |
1449 | * Regulatory hints come on a first come first serve basis and we |
1450 | * must process each one atomically. |
1451 | */ |
1452 | static void reg_process_pending_hints(void) |
1453 | { |
1454 | struct regulatory_request *reg_request; |
1455 | |
1456 | mutex_lock(&cfg80211_mutex); |
1457 | mutex_lock(®_mutex); |
1458 | |
1459 | /* When last_request->processed becomes true this will be rescheduled */ |
1460 | if (last_request && !last_request->processed) { |
1461 | REG_DBG_PRINT("Pending regulatory request, waiting " |
1462 | "for it to be processed..."); |
1463 | goto out; |
1464 | } |
1465 | |
1466 | spin_lock(®_requests_lock); |
1467 | |
1468 | if (list_empty(®_requests_list)) { |
1469 | spin_unlock(®_requests_lock); |
1470 | goto out; |
1471 | } |
1472 | |
1473 | reg_request = list_first_entry(®_requests_list, |
1474 | struct regulatory_request, |
1475 | list); |
1476 | list_del_init(®_request->list); |
1477 | |
1478 | spin_unlock(®_requests_lock); |
1479 | |
1480 | reg_process_hint(reg_request); |
1481 | |
1482 | out: |
1483 | mutex_unlock(®_mutex); |
1484 | mutex_unlock(&cfg80211_mutex); |
1485 | } |
1486 | |
1487 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1488 | static void reg_process_pending_beacon_hints(void) |
1489 | { |
1490 | struct cfg80211_registered_device *rdev; |
1491 | struct reg_beacon *pending_beacon, *tmp; |
1492 | |
1493 | /* |
1494 | * No need to hold the reg_mutex here as we just touch wiphys |
1495 | * and do not read or access regulatory variables. |
1496 | */ |
1497 | mutex_lock(&cfg80211_mutex); |
1498 | |
1499 | /* This goes through the _pending_ beacon list */ |
1500 | spin_lock_bh(®_pending_beacons_lock); |
1501 | |
1502 | if (list_empty(®_pending_beacons)) { |
1503 | spin_unlock_bh(®_pending_beacons_lock); |
1504 | goto out; |
1505 | } |
1506 | |
1507 | list_for_each_entry_safe(pending_beacon, tmp, |
1508 | ®_pending_beacons, list) { |
1509 | |
1510 | list_del_init(&pending_beacon->list); |
1511 | |
1512 | /* Applies the beacon hint to current wiphys */ |
1513 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1514 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); |
1515 | |
1516 | /* Remembers the beacon hint for new wiphys or reg changes */ |
1517 | list_add_tail(&pending_beacon->list, ®_beacon_list); |
1518 | } |
1519 | |
1520 | spin_unlock_bh(®_pending_beacons_lock); |
1521 | out: |
1522 | mutex_unlock(&cfg80211_mutex); |
1523 | } |
1524 | |
1525 | static void reg_todo(struct work_struct *work) |
1526 | { |
1527 | reg_process_pending_hints(); |
1528 | reg_process_pending_beacon_hints(); |
1529 | } |
1530 | |
1531 | static void queue_regulatory_request(struct regulatory_request *request) |
1532 | { |
1533 | if (isalpha(request->alpha2[0])) |
1534 | request->alpha2[0] = toupper(request->alpha2[0]); |
1535 | if (isalpha(request->alpha2[1])) |
1536 | request->alpha2[1] = toupper(request->alpha2[1]); |
1537 | |
1538 | spin_lock(®_requests_lock); |
1539 | list_add_tail(&request->list, ®_requests_list); |
1540 | spin_unlock(®_requests_lock); |
1541 | |
1542 | schedule_work(®_work); |
1543 | } |
1544 | |
1545 | /* |
1546 | * Core regulatory hint -- happens during cfg80211_init() |
1547 | * and when we restore regulatory settings. |
1548 | */ |
1549 | static int regulatory_hint_core(const char *alpha2) |
1550 | { |
1551 | struct regulatory_request *request; |
1552 | |
1553 | kfree(last_request); |
1554 | last_request = NULL; |
1555 | |
1556 | request = kzalloc(sizeof(struct regulatory_request), |
1557 | GFP_KERNEL); |
1558 | if (!request) |
1559 | return -ENOMEM; |
1560 | |
1561 | request->alpha2[0] = alpha2[0]; |
1562 | request->alpha2[1] = alpha2[1]; |
1563 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
1564 | |
1565 | queue_regulatory_request(request); |
1566 | |
1567 | return 0; |
1568 | } |
1569 | |
1570 | /* User hints */ |
1571 | int regulatory_hint_user(const char *alpha2) |
1572 | { |
1573 | struct regulatory_request *request; |
1574 | |
1575 | BUG_ON(!alpha2); |
1576 | |
1577 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1578 | if (!request) |
1579 | return -ENOMEM; |
1580 | |
1581 | request->wiphy_idx = WIPHY_IDX_STALE; |
1582 | request->alpha2[0] = alpha2[0]; |
1583 | request->alpha2[1] = alpha2[1]; |
1584 | request->initiator = NL80211_REGDOM_SET_BY_USER; |
1585 | |
1586 | queue_regulatory_request(request); |
1587 | |
1588 | return 0; |
1589 | } |
1590 | |
1591 | /* Driver hints */ |
1592 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) |
1593 | { |
1594 | struct regulatory_request *request; |
1595 | |
1596 | BUG_ON(!alpha2); |
1597 | BUG_ON(!wiphy); |
1598 | |
1599 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1600 | if (!request) |
1601 | return -ENOMEM; |
1602 | |
1603 | request->wiphy_idx = get_wiphy_idx(wiphy); |
1604 | |
1605 | /* Must have registered wiphy first */ |
1606 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); |
1607 | |
1608 | request->alpha2[0] = alpha2[0]; |
1609 | request->alpha2[1] = alpha2[1]; |
1610 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
1611 | |
1612 | queue_regulatory_request(request); |
1613 | |
1614 | return 0; |
1615 | } |
1616 | EXPORT_SYMBOL(regulatory_hint); |
1617 | |
1618 | /* |
1619 | * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and |
1620 | * therefore cannot iterate over the rdev list here. |
1621 | */ |
1622 | void regulatory_hint_11d(struct wiphy *wiphy, |
1623 | enum ieee80211_band band, |
1624 | u8 *country_ie, |
1625 | u8 country_ie_len) |
1626 | { |
1627 | char alpha2[2]; |
1628 | enum environment_cap env = ENVIRON_ANY; |
1629 | struct regulatory_request *request; |
1630 | |
1631 | mutex_lock(®_mutex); |
1632 | |
1633 | if (unlikely(!last_request)) |
1634 | goto out; |
1635 | |
1636 | /* IE len must be evenly divisible by 2 */ |
1637 | if (country_ie_len & 0x01) |
1638 | goto out; |
1639 | |
1640 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) |
1641 | goto out; |
1642 | |
1643 | alpha2[0] = country_ie[0]; |
1644 | alpha2[1] = country_ie[1]; |
1645 | |
1646 | if (country_ie[2] == 'I') |
1647 | env = ENVIRON_INDOOR; |
1648 | else if (country_ie[2] == 'O') |
1649 | env = ENVIRON_OUTDOOR; |
1650 | |
1651 | /* |
1652 | * We will run this only upon a successful connection on cfg80211. |
1653 | * We leave conflict resolution to the workqueue, where can hold |
1654 | * cfg80211_mutex. |
1655 | */ |
1656 | if (likely(last_request->initiator == |
1657 | NL80211_REGDOM_SET_BY_COUNTRY_IE && |
1658 | wiphy_idx_valid(last_request->wiphy_idx))) |
1659 | goto out; |
1660 | |
1661 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1662 | if (!request) |
1663 | goto out; |
1664 | |
1665 | request->wiphy_idx = get_wiphy_idx(wiphy); |
1666 | request->alpha2[0] = alpha2[0]; |
1667 | request->alpha2[1] = alpha2[1]; |
1668 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
1669 | request->country_ie_env = env; |
1670 | |
1671 | mutex_unlock(®_mutex); |
1672 | |
1673 | queue_regulatory_request(request); |
1674 | |
1675 | return; |
1676 | |
1677 | out: |
1678 | mutex_unlock(®_mutex); |
1679 | } |
1680 | |
1681 | static void restore_alpha2(char *alpha2, bool reset_user) |
1682 | { |
1683 | /* indicates there is no alpha2 to consider for restoration */ |
1684 | alpha2[0] = '9'; |
1685 | alpha2[1] = '7'; |
1686 | |
1687 | /* The user setting has precedence over the module parameter */ |
1688 | if (is_user_regdom_saved()) { |
1689 | /* Unless we're asked to ignore it and reset it */ |
1690 | if (reset_user) { |
1691 | REG_DBG_PRINT("Restoring regulatory settings " |
1692 | "including user preference\n"); |
1693 | user_alpha2[0] = '9'; |
1694 | user_alpha2[1] = '7'; |
1695 | |
1696 | /* |
1697 | * If we're ignoring user settings, we still need to |
1698 | * check the module parameter to ensure we put things |
1699 | * back as they were for a full restore. |
1700 | */ |
1701 | if (!is_world_regdom(ieee80211_regdom)) { |
1702 | REG_DBG_PRINT("Keeping preference on " |
1703 | "module parameter ieee80211_regdom: %c%c\n", |
1704 | ieee80211_regdom[0], |
1705 | ieee80211_regdom[1]); |
1706 | alpha2[0] = ieee80211_regdom[0]; |
1707 | alpha2[1] = ieee80211_regdom[1]; |
1708 | } |
1709 | } else { |
1710 | REG_DBG_PRINT("Restoring regulatory settings " |
1711 | "while preserving user preference for: %c%c\n", |
1712 | user_alpha2[0], |
1713 | user_alpha2[1]); |
1714 | alpha2[0] = user_alpha2[0]; |
1715 | alpha2[1] = user_alpha2[1]; |
1716 | } |
1717 | } else if (!is_world_regdom(ieee80211_regdom)) { |
1718 | REG_DBG_PRINT("Keeping preference on " |
1719 | "module parameter ieee80211_regdom: %c%c\n", |
1720 | ieee80211_regdom[0], |
1721 | ieee80211_regdom[1]); |
1722 | alpha2[0] = ieee80211_regdom[0]; |
1723 | alpha2[1] = ieee80211_regdom[1]; |
1724 | } else |
1725 | REG_DBG_PRINT("Restoring regulatory settings\n"); |
1726 | } |
1727 | |
1728 | /* |
1729 | * Restoring regulatory settings involves ingoring any |
1730 | * possibly stale country IE information and user regulatory |
1731 | * settings if so desired, this includes any beacon hints |
1732 | * learned as we could have traveled outside to another country |
1733 | * after disconnection. To restore regulatory settings we do |
1734 | * exactly what we did at bootup: |
1735 | * |
1736 | * - send a core regulatory hint |
1737 | * - send a user regulatory hint if applicable |
1738 | * |
1739 | * Device drivers that send a regulatory hint for a specific country |
1740 | * keep their own regulatory domain on wiphy->regd so that does does |
1741 | * not need to be remembered. |
1742 | */ |
1743 | static void restore_regulatory_settings(bool reset_user) |
1744 | { |
1745 | char alpha2[2]; |
1746 | struct reg_beacon *reg_beacon, *btmp; |
1747 | |
1748 | mutex_lock(&cfg80211_mutex); |
1749 | mutex_lock(®_mutex); |
1750 | |
1751 | reset_regdomains(); |
1752 | restore_alpha2(alpha2, reset_user); |
1753 | |
1754 | /* Clear beacon hints */ |
1755 | spin_lock_bh(®_pending_beacons_lock); |
1756 | if (!list_empty(®_pending_beacons)) { |
1757 | list_for_each_entry_safe(reg_beacon, btmp, |
1758 | ®_pending_beacons, list) { |
1759 | list_del(®_beacon->list); |
1760 | kfree(reg_beacon); |
1761 | } |
1762 | } |
1763 | spin_unlock_bh(®_pending_beacons_lock); |
1764 | |
1765 | if (!list_empty(®_beacon_list)) { |
1766 | list_for_each_entry_safe(reg_beacon, btmp, |
1767 | ®_beacon_list, list) { |
1768 | list_del(®_beacon->list); |
1769 | kfree(reg_beacon); |
1770 | } |
1771 | } |
1772 | |
1773 | /* First restore to the basic regulatory settings */ |
1774 | cfg80211_regdomain = cfg80211_world_regdom; |
1775 | |
1776 | mutex_unlock(®_mutex); |
1777 | mutex_unlock(&cfg80211_mutex); |
1778 | |
1779 | regulatory_hint_core(cfg80211_regdomain->alpha2); |
1780 | |
1781 | /* |
1782 | * This restores the ieee80211_regdom module parameter |
1783 | * preference or the last user requested regulatory |
1784 | * settings, user regulatory settings takes precedence. |
1785 | */ |
1786 | if (is_an_alpha2(alpha2)) |
1787 | regulatory_hint_user(user_alpha2); |
1788 | } |
1789 | |
1790 | |
1791 | void regulatory_hint_disconnect(void) |
1792 | { |
1793 | REG_DBG_PRINT("All devices are disconnected, going to " |
1794 | "restore regulatory settings\n"); |
1795 | restore_regulatory_settings(false); |
1796 | } |
1797 | |
1798 | static bool freq_is_chan_12_13_14(u16 freq) |
1799 | { |
1800 | if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) || |
1801 | freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) || |
1802 | freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ)) |
1803 | return true; |
1804 | return false; |
1805 | } |
1806 | |
1807 | int regulatory_hint_found_beacon(struct wiphy *wiphy, |
1808 | struct ieee80211_channel *beacon_chan, |
1809 | gfp_t gfp) |
1810 | { |
1811 | struct reg_beacon *reg_beacon; |
1812 | |
1813 | if (likely((beacon_chan->beacon_found || |
1814 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || |
1815 | (beacon_chan->band == IEEE80211_BAND_2GHZ && |
1816 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) |
1817 | return 0; |
1818 | |
1819 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); |
1820 | if (!reg_beacon) |
1821 | return -ENOMEM; |
1822 | |
1823 | REG_DBG_PRINT("Found new beacon on " |
1824 | "frequency: %d MHz (Ch %d) on %s\n", |
1825 | beacon_chan->center_freq, |
1826 | ieee80211_frequency_to_channel(beacon_chan->center_freq), |
1827 | wiphy_name(wiphy)); |
1828 | |
1829 | memcpy(®_beacon->chan, beacon_chan, |
1830 | sizeof(struct ieee80211_channel)); |
1831 | |
1832 | |
1833 | /* |
1834 | * Since we can be called from BH or and non-BH context |
1835 | * we must use spin_lock_bh() |
1836 | */ |
1837 | spin_lock_bh(®_pending_beacons_lock); |
1838 | list_add_tail(®_beacon->list, ®_pending_beacons); |
1839 | spin_unlock_bh(®_pending_beacons_lock); |
1840 | |
1841 | schedule_work(®_work); |
1842 | |
1843 | return 0; |
1844 | } |
1845 | |
1846 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
1847 | { |
1848 | unsigned int i; |
1849 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1850 | const struct ieee80211_freq_range *freq_range = NULL; |
1851 | const struct ieee80211_power_rule *power_rule = NULL; |
1852 | |
1853 | pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n"); |
1854 | |
1855 | for (i = 0; i < rd->n_reg_rules; i++) { |
1856 | reg_rule = &rd->reg_rules[i]; |
1857 | freq_range = ®_rule->freq_range; |
1858 | power_rule = ®_rule->power_rule; |
1859 | |
1860 | /* |
1861 | * There may not be documentation for max antenna gain |
1862 | * in certain regions |
1863 | */ |
1864 | if (power_rule->max_antenna_gain) |
1865 | pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n", |
1866 | freq_range->start_freq_khz, |
1867 | freq_range->end_freq_khz, |
1868 | freq_range->max_bandwidth_khz, |
1869 | power_rule->max_antenna_gain, |
1870 | power_rule->max_eirp); |
1871 | else |
1872 | pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n", |
1873 | freq_range->start_freq_khz, |
1874 | freq_range->end_freq_khz, |
1875 | freq_range->max_bandwidth_khz, |
1876 | power_rule->max_eirp); |
1877 | } |
1878 | } |
1879 | |
1880 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
1881 | { |
1882 | |
1883 | if (is_intersected_alpha2(rd->alpha2)) { |
1884 | |
1885 | if (last_request->initiator == |
1886 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
1887 | struct cfg80211_registered_device *rdev; |
1888 | rdev = cfg80211_rdev_by_wiphy_idx( |
1889 | last_request->wiphy_idx); |
1890 | if (rdev) { |
1891 | pr_info("Current regulatory domain updated by AP to: %c%c\n", |
1892 | rdev->country_ie_alpha2[0], |
1893 | rdev->country_ie_alpha2[1]); |
1894 | } else |
1895 | pr_info("Current regulatory domain intersected:\n"); |
1896 | } else |
1897 | pr_info("Current regulatory domain intersected:\n"); |
1898 | } else if (is_world_regdom(rd->alpha2)) |
1899 | pr_info("World regulatory domain updated:\n"); |
1900 | else { |
1901 | if (is_unknown_alpha2(rd->alpha2)) |
1902 | pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n"); |
1903 | else |
1904 | pr_info("Regulatory domain changed to country: %c%c\n", |
1905 | rd->alpha2[0], rd->alpha2[1]); |
1906 | } |
1907 | print_rd_rules(rd); |
1908 | } |
1909 | |
1910 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
1911 | { |
1912 | pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]); |
1913 | print_rd_rules(rd); |
1914 | } |
1915 | |
1916 | /* Takes ownership of rd only if it doesn't fail */ |
1917 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
1918 | { |
1919 | const struct ieee80211_regdomain *intersected_rd = NULL; |
1920 | struct cfg80211_registered_device *rdev = NULL; |
1921 | struct wiphy *request_wiphy; |
1922 | /* Some basic sanity checks first */ |
1923 | |
1924 | if (is_world_regdom(rd->alpha2)) { |
1925 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
1926 | return -EINVAL; |
1927 | update_world_regdomain(rd); |
1928 | return 0; |
1929 | } |
1930 | |
1931 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && |
1932 | !is_unknown_alpha2(rd->alpha2)) |
1933 | return -EINVAL; |
1934 | |
1935 | if (!last_request) |
1936 | return -EINVAL; |
1937 | |
1938 | /* |
1939 | * Lets only bother proceeding on the same alpha2 if the current |
1940 | * rd is non static (it means CRDA was present and was used last) |
1941 | * and the pending request came in from a country IE |
1942 | */ |
1943 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
1944 | /* |
1945 | * If someone else asked us to change the rd lets only bother |
1946 | * checking if the alpha2 changes if CRDA was already called |
1947 | */ |
1948 | if (!regdom_changes(rd->alpha2)) |
1949 | return -EINVAL; |
1950 | } |
1951 | |
1952 | /* |
1953 | * Now lets set the regulatory domain, update all driver channels |
1954 | * and finally inform them of what we have done, in case they want |
1955 | * to review or adjust their own settings based on their own |
1956 | * internal EEPROM data |
1957 | */ |
1958 | |
1959 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
1960 | return -EINVAL; |
1961 | |
1962 | if (!is_valid_rd(rd)) { |
1963 | pr_err("Invalid regulatory domain detected:\n"); |
1964 | print_regdomain_info(rd); |
1965 | return -EINVAL; |
1966 | } |
1967 | |
1968 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1969 | |
1970 | if (!last_request->intersect) { |
1971 | int r; |
1972 | |
1973 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
1974 | reset_regdomains(); |
1975 | cfg80211_regdomain = rd; |
1976 | return 0; |
1977 | } |
1978 | |
1979 | /* |
1980 | * For a driver hint, lets copy the regulatory domain the |
1981 | * driver wanted to the wiphy to deal with conflicts |
1982 | */ |
1983 | |
1984 | /* |
1985 | * Userspace could have sent two replies with only |
1986 | * one kernel request. |
1987 | */ |
1988 | if (request_wiphy->regd) |
1989 | return -EALREADY; |
1990 | |
1991 | r = reg_copy_regd(&request_wiphy->regd, rd); |
1992 | if (r) |
1993 | return r; |
1994 | |
1995 | reset_regdomains(); |
1996 | cfg80211_regdomain = rd; |
1997 | return 0; |
1998 | } |
1999 | |
2000 | /* Intersection requires a bit more work */ |
2001 | |
2002 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
2003 | |
2004 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
2005 | if (!intersected_rd) |
2006 | return -EINVAL; |
2007 | |
2008 | /* |
2009 | * We can trash what CRDA provided now. |
2010 | * However if a driver requested this specific regulatory |
2011 | * domain we keep it for its private use |
2012 | */ |
2013 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
2014 | request_wiphy->regd = rd; |
2015 | else |
2016 | kfree(rd); |
2017 | |
2018 | rd = NULL; |
2019 | |
2020 | reset_regdomains(); |
2021 | cfg80211_regdomain = intersected_rd; |
2022 | |
2023 | return 0; |
2024 | } |
2025 | |
2026 | if (!intersected_rd) |
2027 | return -EINVAL; |
2028 | |
2029 | rdev = wiphy_to_dev(request_wiphy); |
2030 | |
2031 | rdev->country_ie_alpha2[0] = rd->alpha2[0]; |
2032 | rdev->country_ie_alpha2[1] = rd->alpha2[1]; |
2033 | rdev->env = last_request->country_ie_env; |
2034 | |
2035 | BUG_ON(intersected_rd == rd); |
2036 | |
2037 | kfree(rd); |
2038 | rd = NULL; |
2039 | |
2040 | reset_regdomains(); |
2041 | cfg80211_regdomain = intersected_rd; |
2042 | |
2043 | return 0; |
2044 | } |
2045 | |
2046 | |
2047 | /* |
2048 | * Use this call to set the current regulatory domain. Conflicts with |
2049 | * multiple drivers can be ironed out later. Caller must've already |
2050 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2051 | */ |
2052 | int set_regdom(const struct ieee80211_regdomain *rd) |
2053 | { |
2054 | int r; |
2055 | |
2056 | assert_cfg80211_lock(); |
2057 | |
2058 | mutex_lock(®_mutex); |
2059 | |
2060 | /* Note that this doesn't update the wiphys, this is done below */ |
2061 | r = __set_regdom(rd); |
2062 | if (r) { |
2063 | kfree(rd); |
2064 | mutex_unlock(®_mutex); |
2065 | return r; |
2066 | } |
2067 | |
2068 | /* This would make this whole thing pointless */ |
2069 | if (!last_request->intersect) |
2070 | BUG_ON(rd != cfg80211_regdomain); |
2071 | |
2072 | /* update all wiphys now with the new established regulatory domain */ |
2073 | update_all_wiphy_regulatory(last_request->initiator); |
2074 | |
2075 | print_regdomain(cfg80211_regdomain); |
2076 | |
2077 | nl80211_send_reg_change_event(last_request); |
2078 | |
2079 | reg_set_request_processed(); |
2080 | |
2081 | mutex_unlock(®_mutex); |
2082 | |
2083 | return r; |
2084 | } |
2085 | |
2086 | #ifdef CONFIG_HOTPLUG |
2087 | int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
2088 | { |
2089 | if (last_request && !last_request->processed) { |
2090 | if (add_uevent_var(env, "COUNTRY=%c%c", |
2091 | last_request->alpha2[0], |
2092 | last_request->alpha2[1])) |
2093 | return -ENOMEM; |
2094 | } |
2095 | |
2096 | return 0; |
2097 | } |
2098 | #else |
2099 | int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
2100 | { |
2101 | return -ENODEV; |
2102 | } |
2103 | #endif /* CONFIG_HOTPLUG */ |
2104 | |
2105 | /* Caller must hold cfg80211_mutex */ |
2106 | void reg_device_remove(struct wiphy *wiphy) |
2107 | { |
2108 | struct wiphy *request_wiphy = NULL; |
2109 | |
2110 | assert_cfg80211_lock(); |
2111 | |
2112 | mutex_lock(®_mutex); |
2113 | |
2114 | kfree(wiphy->regd); |
2115 | |
2116 | if (last_request) |
2117 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
2118 | |
2119 | if (!request_wiphy || request_wiphy != wiphy) |
2120 | goto out; |
2121 | |
2122 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
2123 | last_request->country_ie_env = ENVIRON_ANY; |
2124 | out: |
2125 | mutex_unlock(®_mutex); |
2126 | } |
2127 | |
2128 | int __init regulatory_init(void) |
2129 | { |
2130 | int err = 0; |
2131 | |
2132 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2133 | if (IS_ERR(reg_pdev)) |
2134 | return PTR_ERR(reg_pdev); |
2135 | |
2136 | reg_pdev->dev.type = ®_device_type; |
2137 | |
2138 | spin_lock_init(®_requests_lock); |
2139 | spin_lock_init(®_pending_beacons_lock); |
2140 | |
2141 | cfg80211_regdomain = cfg80211_world_regdom; |
2142 | |
2143 | user_alpha2[0] = '9'; |
2144 | user_alpha2[1] = '7'; |
2145 | |
2146 | /* We always try to get an update for the static regdomain */ |
2147 | err = regulatory_hint_core(cfg80211_regdomain->alpha2); |
2148 | if (err) { |
2149 | if (err == -ENOMEM) |
2150 | return err; |
2151 | /* |
2152 | * N.B. kobject_uevent_env() can fail mainly for when we're out |
2153 | * memory which is handled and propagated appropriately above |
2154 | * but it can also fail during a netlink_broadcast() or during |
2155 | * early boot for call_usermodehelper(). For now treat these |
2156 | * errors as non-fatal. |
2157 | */ |
2158 | pr_err("kobject_uevent_env() was unable to call CRDA during init\n"); |
2159 | #ifdef CONFIG_CFG80211_REG_DEBUG |
2160 | /* We want to find out exactly why when debugging */ |
2161 | WARN_ON(err); |
2162 | #endif |
2163 | } |
2164 | |
2165 | /* |
2166 | * Finally, if the user set the module parameter treat it |
2167 | * as a user hint. |
2168 | */ |
2169 | if (!is_world_regdom(ieee80211_regdom)) |
2170 | regulatory_hint_user(ieee80211_regdom); |
2171 | |
2172 | return 0; |
2173 | } |
2174 | |
2175 | void /* __init_or_exit */ regulatory_exit(void) |
2176 | { |
2177 | struct regulatory_request *reg_request, *tmp; |
2178 | struct reg_beacon *reg_beacon, *btmp; |
2179 | |
2180 | cancel_work_sync(®_work); |
2181 | |
2182 | mutex_lock(&cfg80211_mutex); |
2183 | mutex_lock(®_mutex); |
2184 | |
2185 | reset_regdomains(); |
2186 | |
2187 | kfree(last_request); |
2188 | |
2189 | platform_device_unregister(reg_pdev); |
2190 | |
2191 | spin_lock_bh(®_pending_beacons_lock); |
2192 | if (!list_empty(®_pending_beacons)) { |
2193 | list_for_each_entry_safe(reg_beacon, btmp, |
2194 | ®_pending_beacons, list) { |
2195 | list_del(®_beacon->list); |
2196 | kfree(reg_beacon); |
2197 | } |
2198 | } |
2199 | spin_unlock_bh(®_pending_beacons_lock); |
2200 | |
2201 | if (!list_empty(®_beacon_list)) { |
2202 | list_for_each_entry_safe(reg_beacon, btmp, |
2203 | ®_beacon_list, list) { |
2204 | list_del(®_beacon->list); |
2205 | kfree(reg_beacon); |
2206 | } |
2207 | } |
2208 | |
2209 | spin_lock(®_requests_lock); |
2210 | if (!list_empty(®_requests_list)) { |
2211 | list_for_each_entry_safe(reg_request, tmp, |
2212 | ®_requests_list, list) { |
2213 | list_del(®_request->list); |
2214 | kfree(reg_request); |
2215 | } |
2216 | } |
2217 | spin_unlock(®_requests_lock); |
2218 | |
2219 | mutex_unlock(®_mutex); |
2220 | mutex_unlock(&cfg80211_mutex); |
2221 | } |
2222 |
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