Commit | Line | Data |
---|---|---|
8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
b2e1b302 | 5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
8318d78a JB |
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 | ||
b2e1b302 LR |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
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 | * | |
b2e1b302 LR |
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 | * | |
8318d78a | 34 | */ |
e9c0268f JP |
35 | |
36 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
37 | ||
8318d78a | 38 | #include <linux/kernel.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
b2e1b302 LR |
40 | #include <linux/list.h> |
41 | #include <linux/random.h> | |
c61029c7 | 42 | #include <linux/ctype.h> |
b2e1b302 LR |
43 | #include <linux/nl80211.h> |
44 | #include <linux/platform_device.h> | |
b2e1b302 | 45 | #include <net/cfg80211.h> |
8318d78a | 46 | #include "core.h" |
b2e1b302 | 47 | #include "reg.h" |
3b377ea9 | 48 | #include "regdb.h" |
73d54c9e | 49 | #include "nl80211.h" |
8318d78a | 50 | |
4113f751 | 51 | #ifdef CONFIG_CFG80211_REG_DEBUG |
8271195e | 52 | #define REG_DBG_PRINT(format, args...) \ |
4113f751 | 53 | do { \ |
e9c0268f | 54 | printk(KERN_DEBUG pr_fmt(format), ##args); \ |
4113f751 LR |
55 | } while (0) |
56 | #else | |
8271195e | 57 | #define REG_DBG_PRINT(args...) |
4113f751 LR |
58 | #endif |
59 | ||
5166ccd2 | 60 | /* Receipt of information from last regulatory request */ |
f6037d09 | 61 | static struct regulatory_request *last_request; |
734366de | 62 | |
b2e1b302 LR |
63 | /* To trigger userspace events */ |
64 | static struct platform_device *reg_pdev; | |
8318d78a | 65 | |
4d9d88d1 SJR |
66 | static struct device_type reg_device_type = { |
67 | .uevent = reg_device_uevent, | |
68 | }; | |
69 | ||
fb1fc7ad LR |
70 | /* |
71 | * Central wireless core regulatory domains, we only need two, | |
734366de | 72 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
73 | * information to give us an alpha2 |
74 | */ | |
f130347c | 75 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 76 | |
abc7381b LR |
77 | /* |
78 | * Protects static reg.c components: | |
79 | * - cfg80211_world_regdom | |
80 | * - cfg80211_regdom | |
abc7381b LR |
81 | * - last_request |
82 | */ | |
670b7f11 | 83 | static DEFINE_MUTEX(reg_mutex); |
46a5ebaf JB |
84 | |
85 | static inline void assert_reg_lock(void) | |
86 | { | |
87 | lockdep_assert_held(®_mutex); | |
88 | } | |
abc7381b | 89 | |
e38f8a7a | 90 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
91 | static LIST_HEAD(reg_requests_list); |
92 | static spinlock_t reg_requests_lock; | |
93 | ||
e38f8a7a LR |
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 | ||
f333a7a2 LR |
106 | static void reg_todo(struct work_struct *work); |
107 | static DECLARE_WORK(reg_work, reg_todo); | |
108 | ||
734366de JB |
109 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
110 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 111 | .n_reg_rules = 5, |
734366de JB |
112 | .alpha2 = "00", |
113 | .reg_rules = { | |
68798a62 LR |
114 | /* IEEE 802.11b/g, channels 1..11 */ |
115 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
116 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
117 | * channel fits here. */ | |
118 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
119 | NL80211_RRF_PASSIVE_SCAN | |
120 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
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 */ | |
ec329ace | 128 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
129 | NL80211_RRF_PASSIVE_SCAN | |
130 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
131 | |
132 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
133 | ||
134 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 135 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
136 | NL80211_RRF_PASSIVE_SCAN | |
137 | NL80211_RRF_NO_IBSS), | |
734366de JB |
138 | } |
139 | }; | |
140 | ||
a3d2eaf0 JB |
141 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
142 | &world_regdom; | |
734366de | 143 | |
6ee7d330 | 144 | static char *ieee80211_regdom = "00"; |
09d989d1 | 145 | static char user_alpha2[2]; |
6ee7d330 | 146 | |
734366de JB |
147 | module_param(ieee80211_regdom, charp, 0444); |
148 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
149 | ||
734366de JB |
150 | static void reset_regdomains(void) |
151 | { | |
942b25cf JB |
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; | |
942b25cf JB |
159 | |
160 | kfree(cfg80211_regdomain); | |
161 | kfree(cfg80211_world_regdom); | |
734366de | 162 | |
a3d2eaf0 | 163 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
164 | cfg80211_regdomain = NULL; |
165 | } | |
166 | ||
fb1fc7ad LR |
167 | /* |
168 | * Dynamic world regulatory domain requested by the wireless | |
169 | * core upon initialization | |
170 | */ | |
a3d2eaf0 | 171 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 172 | { |
f6037d09 | 173 | BUG_ON(!last_request); |
734366de JB |
174 | |
175 | reset_regdomains(); | |
176 | ||
177 | cfg80211_world_regdom = rd; | |
178 | cfg80211_regdomain = rd; | |
179 | } | |
734366de | 180 | |
a3d2eaf0 | 181 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
182 | { |
183 | if (!alpha2) | |
184 | return false; | |
185 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
186 | return true; | |
187 | return false; | |
188 | } | |
8318d78a | 189 | |
a3d2eaf0 | 190 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
191 | { |
192 | if (!alpha2) | |
193 | return false; | |
194 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
195 | return true; | |
196 | return false; | |
197 | } | |
8318d78a | 198 | |
a3d2eaf0 | 199 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
200 | { |
201 | if (!alpha2) | |
202 | return false; | |
fb1fc7ad LR |
203 | /* |
204 | * Special case where regulatory domain was built by driver | |
205 | * but a specific alpha2 cannot be determined | |
206 | */ | |
b2e1b302 LR |
207 | if (alpha2[0] == '9' && alpha2[1] == '9') |
208 | return true; | |
209 | return false; | |
210 | } | |
8318d78a | 211 | |
3f2355cb LR |
212 | static bool is_intersected_alpha2(const char *alpha2) |
213 | { | |
214 | if (!alpha2) | |
215 | return false; | |
fb1fc7ad LR |
216 | /* |
217 | * Special case where regulatory domain is the | |
3f2355cb | 218 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
219 | * structures |
220 | */ | |
3f2355cb LR |
221 | if (alpha2[0] == '9' && alpha2[1] == '8') |
222 | return true; | |
223 | return false; | |
224 | } | |
225 | ||
a3d2eaf0 | 226 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
227 | { |
228 | if (!alpha2) | |
229 | return false; | |
c61029c7 | 230 | if (isalpha(alpha2[0]) && isalpha(alpha2[1])) |
b2e1b302 LR |
231 | return true; |
232 | return false; | |
233 | } | |
8318d78a | 234 | |
a3d2eaf0 | 235 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
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 | ||
69b1572b | 245 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 246 | { |
761cf7ec LR |
247 | assert_cfg80211_lock(); |
248 | ||
b2e1b302 LR |
249 | if (!cfg80211_regdomain) |
250 | return true; | |
251 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
252 | return false; | |
253 | return true; | |
254 | } | |
255 | ||
09d989d1 LR |
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 | ||
3b377ea9 JL |
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); | |
368d06f5 | 308 | static DEFINE_MUTEX(reg_regdb_search_mutex); |
3b377ea9 JL |
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 | ||
368d06f5 | 316 | mutex_lock(®_regdb_search_mutex); |
3b377ea9 JL |
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; | |
3b377ea9 JL |
330 | mutex_lock(&cfg80211_mutex); |
331 | set_regdom(regdom); | |
332 | mutex_unlock(&cfg80211_mutex); | |
3b377ea9 JL |
333 | break; |
334 | } | |
335 | } | |
336 | ||
337 | kfree(request); | |
338 | } | |
368d06f5 | 339 | mutex_unlock(®_regdb_search_mutex); |
3b377ea9 JL |
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 | ||
368d06f5 | 357 | mutex_lock(®_regdb_search_mutex); |
3b377ea9 | 358 | list_add_tail(&request->list, ®_regdb_search_list); |
368d06f5 | 359 | mutex_unlock(®_regdb_search_mutex); |
3b377ea9 JL |
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 | ||
fb1fc7ad LR |
367 | /* |
368 | * This lets us keep regulatory code which is updated on a regulatory | |
4d9d88d1 SJR |
369 | * basis in userspace. Country information is filled in by |
370 | * reg_device_uevent | |
fb1fc7ad | 371 | */ |
b2e1b302 LR |
372 | static int call_crda(const char *alpha2) |
373 | { | |
b2e1b302 | 374 | if (!is_world_regdom((char *) alpha2)) |
e9c0268f | 375 | pr_info("Calling CRDA for country: %c%c\n", |
b2e1b302 LR |
376 | alpha2[0], alpha2[1]); |
377 | else | |
e9c0268f | 378 | pr_info("Calling CRDA to update world regulatory domain\n"); |
b2e1b302 | 379 | |
3b377ea9 JL |
380 | /* query internal regulatory database (if it exists) */ |
381 | reg_regdb_query(alpha2); | |
382 | ||
4d9d88d1 | 383 | return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE); |
b2e1b302 LR |
384 | } |
385 | ||
b2e1b302 | 386 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 387 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 388 | { |
61405e97 LR |
389 | assert_cfg80211_lock(); |
390 | ||
f6037d09 JB |
391 | if (!last_request) |
392 | return false; | |
393 | ||
394 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 395 | } |
8318d78a | 396 | |
b2e1b302 | 397 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 398 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 399 | { |
a3d2eaf0 | 400 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
401 | u32 freq_diff; |
402 | ||
91e99004 | 403 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
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 | ||
bd05f28e RK |
411 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
412 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
413 | return false; |
414 | ||
415 | return true; | |
416 | } | |
417 | ||
a3d2eaf0 | 418 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 419 | { |
a3d2eaf0 | 420 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 421 | unsigned int i; |
8318d78a | 422 | |
b2e1b302 LR |
423 | if (!rd->n_reg_rules) |
424 | return false; | |
8318d78a | 425 | |
88dc1c3f LR |
426 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
427 | return false; | |
428 | ||
b2e1b302 LR |
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; | |
8318d78a JB |
436 | } |
437 | ||
038659e7 LR |
438 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, |
439 | u32 center_freq_khz, | |
440 | u32 bw_khz) | |
b2e1b302 | 441 | { |
038659e7 LR |
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; | |
b2e1b302 | 452 | } |
8318d78a | 453 | |
0c7dc45d LR |
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 | ||
fb1fc7ad LR |
479 | /* |
480 | * Helper for regdom_intersect(), this does the real | |
481 | * mathematical intersection fun | |
482 | */ | |
9c96477d LR |
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 | ||
fb1fc7ad LR |
560 | /* |
561 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
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. | |
fb1fc7ad LR |
565 | * All rules that do check out OK are valid. |
566 | */ | |
9c96477d LR |
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]; | |
fb1fc7ad LR |
594 | /* |
595 | * This time around instead of using the stack lets | |
9c96477d | 596 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
597 | * a memcpy() |
598 | */ | |
9c96477d LR |
599 | intersected_rule = &rd->reg_rules[rule_idx]; |
600 | r = reg_rules_intersect(rule1, rule2, | |
601 | intersected_rule); | |
fb1fc7ad LR |
602 | /* |
603 | * No need to memset here the intersected rule here as | |
604 | * we're not using the stack anymore | |
605 | */ | |
9c96477d LR |
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 | ||
fb1fc7ad LR |
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 | */ | |
b2e1b302 LR |
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 | ||
1fa25e41 LR |
640 | static int freq_reg_info_regd(struct wiphy *wiphy, |
641 | u32 center_freq, | |
038659e7 | 642 | u32 desired_bw_khz, |
1fa25e41 LR |
643 | const struct ieee80211_reg_rule **reg_rule, |
644 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
645 | { |
646 | int i; | |
0c7dc45d | 647 | bool band_rule_found = false; |
3e0c3ff3 | 648 | const struct ieee80211_regdomain *regd; |
038659e7 LR |
649 | bool bw_fits = false; |
650 | ||
651 | if (!desired_bw_khz) | |
652 | desired_bw_khz = MHZ_TO_KHZ(20); | |
8318d78a | 653 | |
1fa25e41 | 654 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 655 | |
fb1fc7ad LR |
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 | */ | |
2784fe91 LR |
660 | if (!custom_regd && |
661 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
7db90f4a | 662 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && |
3e0c3ff3 LR |
663 | wiphy->regd) |
664 | regd = wiphy->regd; | |
665 | ||
666 | if (!regd) | |
b2e1b302 LR |
667 | return -EINVAL; |
668 | ||
3e0c3ff3 | 669 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
670 | const struct ieee80211_reg_rule *rr; |
671 | const struct ieee80211_freq_range *fr = NULL; | |
672 | const struct ieee80211_power_rule *pr = NULL; | |
673 | ||
3e0c3ff3 | 674 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
675 | fr = &rr->freq_range; |
676 | pr = &rr->power_rule; | |
0c7dc45d | 677 | |
fb1fc7ad LR |
678 | /* |
679 | * We only need to know if one frequency rule was | |
0c7dc45d | 680 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
681 | * not overwrite it once found |
682 | */ | |
0c7dc45d LR |
683 | if (!band_rule_found) |
684 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
685 | ||
038659e7 LR |
686 | bw_fits = reg_does_bw_fit(fr, |
687 | center_freq, | |
688 | desired_bw_khz); | |
0c7dc45d | 689 | |
038659e7 | 690 | if (band_rule_found && bw_fits) { |
b2e1b302 | 691 | *reg_rule = rr; |
038659e7 | 692 | return 0; |
8318d78a JB |
693 | } |
694 | } | |
695 | ||
0c7dc45d LR |
696 | if (!band_rule_found) |
697 | return -ERANGE; | |
698 | ||
038659e7 | 699 | return -EINVAL; |
b2e1b302 LR |
700 | } |
701 | ||
038659e7 LR |
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) | |
1fa25e41 | 706 | { |
ac46d48e | 707 | assert_cfg80211_lock(); |
038659e7 LR |
708 | return freq_reg_info_regd(wiphy, |
709 | center_freq, | |
710 | desired_bw_khz, | |
711 | reg_rule, | |
712 | NULL); | |
1fa25e41 | 713 | } |
4f366c5d | 714 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 715 | |
926a0a09 LR |
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 | } | |
e702d3cf LR |
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 | ||
d91e41b6 | 750 | REG_DBG_PRINT("Updating information on frequency %d MHz " |
ff039c6f | 751 | "for a %d MHz width channel with regulatory rule:\n", |
e702d3cf LR |
752 | chan->center_freq, |
753 | KHZ_TO_MHZ(desired_bw_khz)); | |
754 | ||
d91e41b6 | 755 | REG_DBG_PRINT("%d KHz - %d KHz @ KHz), (%s mBi, %d mBm)\n", |
e702d3cf LR |
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 | } | |
926a0a09 LR |
768 | #endif |
769 | ||
038659e7 LR |
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 | */ | |
7ca43d03 LR |
779 | static void handle_channel(struct wiphy *wiphy, |
780 | enum nl80211_reg_initiator initiator, | |
781 | enum ieee80211_band band, | |
a92a3ce7 | 782 | unsigned int chan_idx) |
b2e1b302 LR |
783 | { |
784 | int r; | |
038659e7 LR |
785 | u32 flags, bw_flags = 0; |
786 | u32 desired_bw_khz = MHZ_TO_KHZ(20); | |
b2e1b302 LR |
787 | const struct ieee80211_reg_rule *reg_rule = NULL; |
788 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 789 | const struct ieee80211_freq_range *freq_range = NULL; |
a92a3ce7 LR |
790 | struct ieee80211_supported_band *sband; |
791 | struct ieee80211_channel *chan; | |
fe33eb39 | 792 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 793 | |
761cf7ec LR |
794 | assert_cfg80211_lock(); |
795 | ||
806a9e39 LR |
796 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
797 | ||
a92a3ce7 LR |
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; | |
b2e1b302 | 803 | |
038659e7 LR |
804 | r = freq_reg_info(wiphy, |
805 | MHZ_TO_KHZ(chan->center_freq), | |
806 | desired_bw_khz, | |
807 | ®_rule); | |
b2e1b302 | 808 | |
ca4ffe8f LR |
809 | if (r) { |
810 | /* | |
811 | * We will disable all channels that do not match our | |
812 | * recieved 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 | ||
d91e41b6 | 824 | REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq); |
ca4ffe8f | 825 | chan->flags = IEEE80211_CHAN_DISABLED; |
8318d78a | 826 | return; |
ca4ffe8f | 827 | } |
8318d78a | 828 | |
e702d3cf LR |
829 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
830 | ||
b2e1b302 | 831 | power_rule = ®_rule->power_rule; |
038659e7 LR |
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; | |
b2e1b302 | 836 | |
7db90f4a | 837 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
806a9e39 | 838 | request_wiphy && request_wiphy == wiphy && |
5be83de5 | 839 | request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
fb1fc7ad LR |
840 | /* |
841 | * This gaurantees the driver's requested regulatory domain | |
f976376d | 842 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
843 | * settings |
844 | */ | |
f976376d | 845 | chan->flags = chan->orig_flags = |
038659e7 | 846 | map_regdom_flags(reg_rule->flags) | bw_flags; |
f976376d LR |
847 | chan->max_antenna_gain = chan->orig_mag = |
848 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
f976376d LR |
849 | chan->max_power = chan->orig_mpwr = |
850 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
851 | return; | |
852 | } | |
853 | ||
038659e7 | 854 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 855 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 | 856 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
253898c4 | 857 | if (chan->orig_mpwr) |
b2e1b302 LR |
858 | chan->max_power = min(chan->orig_mpwr, |
859 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 860 | else |
b2e1b302 | 861 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
862 | } |
863 | ||
7ca43d03 LR |
864 | static void handle_band(struct wiphy *wiphy, |
865 | enum ieee80211_band band, | |
866 | enum nl80211_reg_initiator initiator) | |
8318d78a | 867 | { |
a92a3ce7 LR |
868 | unsigned int i; |
869 | struct ieee80211_supported_band *sband; | |
870 | ||
871 | BUG_ON(!wiphy->bands[band]); | |
872 | sband = wiphy->bands[band]; | |
8318d78a JB |
873 | |
874 | for (i = 0; i < sband->n_channels; i++) | |
7ca43d03 | 875 | handle_channel(wiphy, initiator, band, i); |
8318d78a JB |
876 | } |
877 | ||
7db90f4a LR |
878 | static bool ignore_reg_update(struct wiphy *wiphy, |
879 | enum nl80211_reg_initiator initiator) | |
14b9815a | 880 | { |
926a0a09 | 881 | if (!last_request) { |
d91e41b6 | 882 | REG_DBG_PRINT("Ignoring regulatory request %s since " |
926a0a09 LR |
883 | "last_request is not set\n", |
884 | reg_initiator_name(initiator)); | |
14b9815a | 885 | return true; |
926a0a09 LR |
886 | } |
887 | ||
7db90f4a | 888 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
926a0a09 | 889 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { |
d91e41b6 | 890 | REG_DBG_PRINT("Ignoring regulatory request %s " |
926a0a09 LR |
891 | "since the driver uses its own custom " |
892 | "regulatory domain ", | |
893 | reg_initiator_name(initiator)); | |
14b9815a | 894 | return true; |
926a0a09 LR |
895 | } |
896 | ||
fb1fc7ad LR |
897 | /* |
898 | * wiphy->regd will be set once the device has its own | |
899 | * desired regulatory domain set | |
900 | */ | |
5be83de5 | 901 | if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && |
749b527b | 902 | initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
926a0a09 | 903 | !is_world_regdom(last_request->alpha2)) { |
d91e41b6 | 904 | REG_DBG_PRINT("Ignoring regulatory request %s " |
926a0a09 LR |
905 | "since the driver requires its own regulaotry " |
906 | "domain to be set first", | |
907 | reg_initiator_name(initiator)); | |
14b9815a | 908 | return true; |
926a0a09 LR |
909 | } |
910 | ||
14b9815a LR |
911 | return false; |
912 | } | |
913 | ||
7db90f4a | 914 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
8318d78a | 915 | { |
79c97e97 | 916 | struct cfg80211_registered_device *rdev; |
8318d78a | 917 | |
79c97e97 JB |
918 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
919 | wiphy_update_regulatory(&rdev->wiphy, initiator); | |
b2e1b302 LR |
920 | } |
921 | ||
e38f8a7a LR |
922 | static void handle_reg_beacon(struct wiphy *wiphy, |
923 | unsigned int chan_idx, | |
924 | struct reg_beacon *reg_beacon) | |
925 | { | |
e38f8a7a LR |
926 | struct ieee80211_supported_band *sband; |
927 | struct ieee80211_channel *chan; | |
6bad8766 LR |
928 | bool channel_changed = false; |
929 | struct ieee80211_channel chan_before; | |
e38f8a7a LR |
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 | ||
6bad8766 LR |
939 | if (chan->beacon_found) |
940 | return; | |
941 | ||
942 | chan->beacon_found = true; | |
943 | ||
5be83de5 | 944 | if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) |
37184244 LR |
945 | return; |
946 | ||
6bad8766 LR |
947 | chan_before.center_freq = chan->center_freq; |
948 | chan_before.flags = chan->flags; | |
949 | ||
37184244 | 950 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { |
e38f8a7a | 951 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; |
6bad8766 | 952 | channel_changed = true; |
e38f8a7a LR |
953 | } |
954 | ||
37184244 | 955 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { |
e38f8a7a | 956 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; |
6bad8766 | 957 | channel_changed = true; |
e38f8a7a LR |
958 | } |
959 | ||
6bad8766 LR |
960 | if (channel_changed) |
961 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
e38f8a7a LR |
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; | |
b1ed8ddd LR |
1013 | if (last_request && |
1014 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
5be83de5 | 1015 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) |
e38f8a7a LR |
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 | { | |
b1ed8ddd LR |
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; | |
e38f8a7a LR |
1029 | if (!reg_is_world_roaming(wiphy)) |
1030 | return; | |
1031 | wiphy_update_beacon_reg(wiphy); | |
1032 | } | |
1033 | ||
038659e7 LR |
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)) | |
689da1b3 | 1084 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 | 1085 | else |
689da1b3 | 1086 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 LR |
1087 | |
1088 | if (is_ht40_not_allowed(channel_after)) | |
689da1b3 | 1089 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 | 1090 | else |
689da1b3 | 1091 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 LR |
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 | ||
7db90f4a LR |
1121 | void wiphy_update_regulatory(struct wiphy *wiphy, |
1122 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1123 | { |
1124 | enum ieee80211_band band; | |
d46e5b1d | 1125 | |
7db90f4a | 1126 | if (ignore_reg_update(wiphy, initiator)) |
e38f8a7a | 1127 | goto out; |
b2e1b302 | 1128 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1129 | if (wiphy->bands[band]) |
7ca43d03 | 1130 | handle_band(wiphy, band, initiator); |
b2e1b302 | 1131 | } |
e38f8a7a LR |
1132 | out: |
1133 | reg_process_beacons(wiphy); | |
038659e7 | 1134 | reg_process_ht_flags(wiphy); |
560e28e1 | 1135 | if (wiphy->reg_notifier) |
716f9392 | 1136 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1137 | } |
1138 | ||
1fa25e41 LR |
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; | |
038659e7 LR |
1145 | u32 desired_bw_khz = MHZ_TO_KHZ(20); |
1146 | u32 bw_flags = 0; | |
1fa25e41 LR |
1147 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1148 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 1149 | const struct ieee80211_freq_range *freq_range = NULL; |
1fa25e41 LR |
1150 | struct ieee80211_supported_band *sband; |
1151 | struct ieee80211_channel *chan; | |
1152 | ||
abc7381b | 1153 | assert_reg_lock(); |
ac46d48e | 1154 | |
1fa25e41 LR |
1155 | sband = wiphy->bands[band]; |
1156 | BUG_ON(chan_idx >= sband->n_channels); | |
1157 | chan = &sband->channels[chan_idx]; | |
1158 | ||
038659e7 LR |
1159 | r = freq_reg_info_regd(wiphy, |
1160 | MHZ_TO_KHZ(chan->center_freq), | |
1161 | desired_bw_khz, | |
1162 | ®_rule, | |
1163 | regd); | |
1fa25e41 LR |
1164 | |
1165 | if (r) { | |
d91e41b6 | 1166 | REG_DBG_PRINT("Disabling freq %d MHz as custom " |
a6518536 LR |
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)); | |
1fa25e41 LR |
1171 | chan->flags = IEEE80211_CHAN_DISABLED; |
1172 | return; | |
1173 | } | |
1174 | ||
e702d3cf LR |
1175 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
1176 | ||
1fa25e41 | 1177 | power_rule = ®_rule->power_rule; |
038659e7 LR |
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; | |
1fa25e41 | 1182 | |
038659e7 | 1183 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; |
1fa25e41 | 1184 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); |
1fa25e41 LR |
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; | |
bbcf3f02 | 1206 | unsigned int bands_set = 0; |
ac46d48e | 1207 | |
abc7381b | 1208 | mutex_lock(®_mutex); |
1fa25e41 | 1209 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
bbcf3f02 LR |
1210 | if (!wiphy->bands[band]) |
1211 | continue; | |
1212 | handle_band_custom(wiphy, band, regd); | |
1213 | bands_set++; | |
b2e1b302 | 1214 | } |
abc7381b | 1215 | mutex_unlock(®_mutex); |
bbcf3f02 LR |
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); | |
b2e1b302 | 1222 | } |
1fa25e41 LR |
1223 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1224 | ||
fb1fc7ad LR |
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 | */ | |
9c96477d LR |
1229 | #define REG_INTERSECT 1 |
1230 | ||
84fa4f43 JB |
1231 | /* This has the logic which determines when a new request |
1232 | * should be ignored. */ | |
2f92cd2e LR |
1233 | static int ignore_request(struct wiphy *wiphy, |
1234 | struct regulatory_request *pending_request) | |
84fa4f43 | 1235 | { |
806a9e39 | 1236 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1237 | |
1238 | assert_cfg80211_lock(); | |
1239 | ||
84fa4f43 JB |
1240 | /* All initial requests are respected */ |
1241 | if (!last_request) | |
1242 | return 0; | |
1243 | ||
2f92cd2e | 1244 | switch (pending_request->initiator) { |
7db90f4a | 1245 | case NL80211_REGDOM_SET_BY_CORE: |
09d989d1 | 1246 | return 0; |
7db90f4a | 1247 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1248 | |
1249 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1250 | ||
2f92cd2e | 1251 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1252 | return -EINVAL; |
7db90f4a LR |
1253 | if (last_request->initiator == |
1254 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1255 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1256 | /* |
1257 | * Two cards with two APs claiming different | |
1fe90b03 | 1258 | * Country IE alpha2s. We could |
84fa4f43 JB |
1259 | * intersect them, but that seems unlikely |
1260 | * to be correct. Reject second one for now. | |
1261 | */ | |
2f92cd2e | 1262 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1263 | return -EOPNOTSUPP; |
1264 | return -EALREADY; | |
1265 | } | |
fb1fc7ad LR |
1266 | /* |
1267 | * Two consecutive Country IE hints on the same wiphy. | |
1268 | * This should be picked up early by the driver/stack | |
1269 | */ | |
2f92cd2e | 1270 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1271 | return 0; |
1272 | return -EALREADY; | |
1273 | } | |
a171fba4 | 1274 | return 0; |
7db90f4a LR |
1275 | case NL80211_REGDOM_SET_BY_DRIVER: |
1276 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
2f92cd2e | 1277 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1278 | return 0; |
84fa4f43 | 1279 | return -EALREADY; |
e74b1e7f | 1280 | } |
fff32c04 LR |
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 | */ | |
7db90f4a | 1287 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1288 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1289 | return -EALREADY; |
1290 | ||
3e0c3ff3 | 1291 | return REG_INTERSECT; |
7db90f4a LR |
1292 | case NL80211_REGDOM_SET_BY_USER: |
1293 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1294 | return REG_INTERSECT; |
fb1fc7ad LR |
1295 | /* |
1296 | * If the user knows better the user should set the regdom | |
1297 | * to their country before the IE is picked up | |
1298 | */ | |
7db90f4a | 1299 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1300 | last_request->intersect) |
1301 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1302 | /* |
1303 | * Process user requests only after previous user/driver/core | |
1304 | * requests have been processed | |
1305 | */ | |
7db90f4a LR |
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) { | |
69b1572b | 1309 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1310 | return -EAGAIN; |
1311 | } | |
1312 | ||
baeb66fe | 1313 | if (!regdom_changes(pending_request->alpha2)) |
e74b1e7f LR |
1314 | return -EALREADY; |
1315 | ||
84fa4f43 JB |
1316 | return 0; |
1317 | } | |
1318 | ||
1319 | return -EINVAL; | |
1320 | } | |
1321 | ||
b2e253cf LR |
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 | ||
d1c96a9a LR |
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 | |
28da32d7 | 1341 | * @pending_request: the regulatory request currently being processed |
d1c96a9a LR |
1342 | * |
1343 | * The Wireless subsystem can use this function to hint to the wireless core | |
28da32d7 | 1344 | * what it believes should be the current regulatory domain. |
d1c96a9a LR |
1345 | * |
1346 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1347 | * already been set or other standard error codes. | |
1348 | * | |
abc7381b | 1349 | * Caller must hold &cfg80211_mutex and ®_mutex |
d1c96a9a | 1350 | */ |
28da32d7 LR |
1351 | static int __regulatory_hint(struct wiphy *wiphy, |
1352 | struct regulatory_request *pending_request) | |
b2e1b302 | 1353 | { |
9c96477d | 1354 | bool intersect = false; |
b2e1b302 LR |
1355 | int r = 0; |
1356 | ||
761cf7ec LR |
1357 | assert_cfg80211_lock(); |
1358 | ||
2f92cd2e | 1359 | r = ignore_request(wiphy, pending_request); |
9c96477d | 1360 | |
3e0c3ff3 | 1361 | if (r == REG_INTERSECT) { |
7db90f4a LR |
1362 | if (pending_request->initiator == |
1363 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1364 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1365 | if (r) { |
1366 | kfree(pending_request); | |
3e0c3ff3 | 1367 | return r; |
d951c1dd | 1368 | } |
3e0c3ff3 | 1369 | } |
9c96477d | 1370 | intersect = true; |
3e0c3ff3 | 1371 | } else if (r) { |
fb1fc7ad LR |
1372 | /* |
1373 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1374 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1375 | * wiphy |
1376 | */ | |
28da32d7 | 1377 | if (r == -EALREADY && |
7db90f4a LR |
1378 | pending_request->initiator == |
1379 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1380 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1381 | if (r) { |
1382 | kfree(pending_request); | |
3e0c3ff3 | 1383 | return r; |
d951c1dd | 1384 | } |
3e0c3ff3 LR |
1385 | r = -EALREADY; |
1386 | goto new_request; | |
1387 | } | |
d951c1dd | 1388 | kfree(pending_request); |
b2e1b302 | 1389 | return r; |
3e0c3ff3 | 1390 | } |
b2e1b302 | 1391 | |
3e0c3ff3 | 1392 | new_request: |
d951c1dd | 1393 | kfree(last_request); |
5203cdb6 | 1394 | |
d951c1dd LR |
1395 | last_request = pending_request; |
1396 | last_request->intersect = intersect; | |
5203cdb6 | 1397 | |
d951c1dd | 1398 | pending_request = NULL; |
3e0c3ff3 | 1399 | |
09d989d1 LR |
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 | ||
3e0c3ff3 | 1405 | /* When r == REG_INTERSECT we do need to call CRDA */ |
73d54c9e LR |
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 | */ | |
b2e253cf | 1412 | if (r == -EALREADY) { |
73d54c9e | 1413 | nl80211_send_reg_change_event(last_request); |
b2e253cf LR |
1414 | reg_set_request_processed(); |
1415 | } | |
3e0c3ff3 | 1416 | return r; |
73d54c9e | 1417 | } |
3e0c3ff3 | 1418 | |
d951c1dd | 1419 | return call_crda(last_request->alpha2); |
b2e1b302 LR |
1420 | } |
1421 | ||
30a548c7 | 1422 | /* This processes *all* regulatory hints */ |
d951c1dd | 1423 | static void reg_process_hint(struct regulatory_request *reg_request) |
fe33eb39 LR |
1424 | { |
1425 | int r = 0; | |
1426 | struct wiphy *wiphy = NULL; | |
c4c32294 | 1427 | enum nl80211_reg_initiator initiator = reg_request->initiator; |
fe33eb39 LR |
1428 | |
1429 | BUG_ON(!reg_request->alpha2); | |
1430 | ||
fe33eb39 LR |
1431 | if (wiphy_idx_valid(reg_request->wiphy_idx)) |
1432 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1433 | ||
7db90f4a | 1434 | if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
fe33eb39 | 1435 | !wiphy) { |
d951c1dd | 1436 | kfree(reg_request); |
b0e2880b | 1437 | return; |
fe33eb39 LR |
1438 | } |
1439 | ||
28da32d7 | 1440 | r = __regulatory_hint(wiphy, reg_request); |
fe33eb39 | 1441 | /* This is required so that the orig_* parameters are saved */ |
5be83de5 JB |
1442 | if (r == -EALREADY && wiphy && |
1443 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) | |
c4c32294 | 1444 | wiphy_update_regulatory(wiphy, initiator); |
fe33eb39 LR |
1445 | } |
1446 | ||
b2e253cf LR |
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 | */ | |
fe33eb39 | 1452 | static void reg_process_pending_hints(void) |
b0e2880b | 1453 | { |
fe33eb39 | 1454 | struct regulatory_request *reg_request; |
fe33eb39 | 1455 | |
b0e2880b LR |
1456 | mutex_lock(&cfg80211_mutex); |
1457 | mutex_lock(®_mutex); | |
1458 | ||
b2e253cf LR |
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 | ||
fe33eb39 | 1466 | spin_lock(®_requests_lock); |
fe33eb39 | 1467 | |
b2e253cf | 1468 | if (list_empty(®_requests_list)) { |
d951c1dd | 1469 | spin_unlock(®_requests_lock); |
b2e253cf | 1470 | goto out; |
fe33eb39 | 1471 | } |
b2e253cf LR |
1472 | |
1473 | reg_request = list_first_entry(®_requests_list, | |
1474 | struct regulatory_request, | |
1475 | list); | |
1476 | list_del_init(®_request->list); | |
1477 | ||
fe33eb39 | 1478 | spin_unlock(®_requests_lock); |
b0e2880b | 1479 | |
b2e253cf LR |
1480 | reg_process_hint(reg_request); |
1481 | ||
1482 | out: | |
b0e2880b LR |
1483 | mutex_unlock(®_mutex); |
1484 | mutex_unlock(&cfg80211_mutex); | |
fe33eb39 LR |
1485 | } |
1486 | ||
e38f8a7a LR |
1487 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1488 | static void reg_process_pending_beacon_hints(void) | |
1489 | { | |
79c97e97 | 1490 | struct cfg80211_registered_device *rdev; |
e38f8a7a LR |
1491 | struct reg_beacon *pending_beacon, *tmp; |
1492 | ||
abc7381b LR |
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 | */ | |
e38f8a7a LR |
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 */ | |
79c97e97 JB |
1513 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1514 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); | |
e38f8a7a LR |
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 | ||
fe33eb39 LR |
1525 | static void reg_todo(struct work_struct *work) |
1526 | { | |
1527 | reg_process_pending_hints(); | |
e38f8a7a | 1528 | reg_process_pending_beacon_hints(); |
fe33eb39 LR |
1529 | } |
1530 | ||
fe33eb39 LR |
1531 | static void queue_regulatory_request(struct regulatory_request *request) |
1532 | { | |
c61029c7 JL |
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 | ||
fe33eb39 LR |
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 | ||
09d989d1 LR |
1545 | /* |
1546 | * Core regulatory hint -- happens during cfg80211_init() | |
1547 | * and when we restore regulatory settings. | |
1548 | */ | |
ba25c141 LR |
1549 | static int regulatory_hint_core(const char *alpha2) |
1550 | { | |
1551 | struct regulatory_request *request; | |
1552 | ||
09d989d1 LR |
1553 | kfree(last_request); |
1554 | last_request = NULL; | |
ba25c141 LR |
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]; | |
7db90f4a | 1563 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
ba25c141 | 1564 | |
31e99729 | 1565 | queue_regulatory_request(request); |
5078b2e3 | 1566 | |
fe33eb39 | 1567 | return 0; |
ba25c141 LR |
1568 | } |
1569 | ||
fe33eb39 LR |
1570 | /* User hints */ |
1571 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1572 | { |
fe33eb39 LR |
1573 | struct regulatory_request *request; |
1574 | ||
be3d4810 | 1575 | BUG_ON(!alpha2); |
b2e1b302 | 1576 | |
fe33eb39 LR |
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]; | |
e12822e1 | 1584 | request->initiator = NL80211_REGDOM_SET_BY_USER; |
fe33eb39 LR |
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]; | |
7db90f4a | 1610 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
fe33eb39 LR |
1611 | |
1612 | queue_regulatory_request(request); | |
1613 | ||
1614 | return 0; | |
b2e1b302 LR |
1615 | } |
1616 | EXPORT_SYMBOL(regulatory_hint); | |
1617 | ||
4b44c8bc LR |
1618 | /* |
1619 | * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and | |
1620 | * therefore cannot iterate over the rdev list here. | |
1621 | */ | |
3f2355cb | 1622 | void regulatory_hint_11d(struct wiphy *wiphy, |
84920e3e LR |
1623 | enum ieee80211_band band, |
1624 | u8 *country_ie, | |
1625 | u8 country_ie_len) | |
3f2355cb | 1626 | { |
3f2355cb | 1627 | char alpha2[2]; |
3f2355cb | 1628 | enum environment_cap env = ENVIRON_ANY; |
fe33eb39 | 1629 | struct regulatory_request *request; |
3f2355cb | 1630 | |
abc7381b | 1631 | mutex_lock(®_mutex); |
3f2355cb | 1632 | |
9828b017 LR |
1633 | if (unlikely(!last_request)) |
1634 | goto out; | |
d335fe63 | 1635 | |
3f2355cb LR |
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 | ||
3f2355cb LR |
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 | ||
fb1fc7ad | 1651 | /* |
8b19e6ca | 1652 | * We will run this only upon a successful connection on cfg80211. |
4b44c8bc LR |
1653 | * We leave conflict resolution to the workqueue, where can hold |
1654 | * cfg80211_mutex. | |
fb1fc7ad | 1655 | */ |
cc0b6fe8 LR |
1656 | if (likely(last_request->initiator == |
1657 | NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
4b44c8bc LR |
1658 | wiphy_idx_valid(last_request->wiphy_idx))) |
1659 | goto out; | |
3f2355cb | 1660 | |
fe33eb39 LR |
1661 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1662 | if (!request) | |
f9f9b6e3 | 1663 | goto out; |
fe33eb39 | 1664 | |
fe33eb39 | 1665 | request->wiphy_idx = get_wiphy_idx(wiphy); |
4f366c5d JL |
1666 | request->alpha2[0] = alpha2[0]; |
1667 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1668 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
fe33eb39 LR |
1669 | request->country_ie_env = env; |
1670 | ||
abc7381b | 1671 | mutex_unlock(®_mutex); |
3f2355cb | 1672 | |
fe33eb39 LR |
1673 | queue_regulatory_request(request); |
1674 | ||
1675 | return; | |
0441d6ff | 1676 | |
3f2355cb | 1677 | out: |
abc7381b | 1678 | mutex_unlock(®_mutex); |
3f2355cb | 1679 | } |
b2e1b302 | 1680 | |
09d989d1 LR |
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) { | |
d91e41b6 | 1691 | REG_DBG_PRINT("Restoring regulatory settings " |
09d989d1 LR |
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)) { | |
d91e41b6 | 1702 | REG_DBG_PRINT("Keeping preference on " |
09d989d1 LR |
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 { | |
d91e41b6 | 1710 | REG_DBG_PRINT("Restoring regulatory settings " |
09d989d1 LR |
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)) { | |
d91e41b6 | 1718 | REG_DBG_PRINT("Keeping preference on " |
09d989d1 LR |
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 | |
d91e41b6 | 1725 | REG_DBG_PRINT("Restoring regulatory settings\n"); |
09d989d1 LR |
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 | { | |
d91e41b6 | 1793 | REG_DBG_PRINT("All devices are disconnected, going to " |
09d989d1 LR |
1794 | "restore regulatory settings\n"); |
1795 | restore_regulatory_settings(false); | |
1796 | } | |
1797 | ||
e38f8a7a LR |
1798 | static bool freq_is_chan_12_13_14(u16 freq) |
1799 | { | |
59eb21a6 BR |
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)) | |
e38f8a7a LR |
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 | ||
d91e41b6 | 1823 | REG_DBG_PRINT("Found new beacon on " |
4113f751 LR |
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 | ||
e38f8a7a LR |
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 | ||
a3d2eaf0 | 1846 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1847 | { |
1848 | unsigned int i; | |
a3d2eaf0 JB |
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; | |
b2e1b302 | 1852 | |
e9c0268f | 1853 | pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n"); |
b2e1b302 LR |
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 | ||
fb1fc7ad LR |
1860 | /* |
1861 | * There may not be documentation for max antenna gain | |
1862 | * in certain regions | |
1863 | */ | |
b2e1b302 | 1864 | if (power_rule->max_antenna_gain) |
e9c0268f | 1865 | pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n", |
b2e1b302 LR |
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 | |
e9c0268f | 1872 | pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n", |
b2e1b302 LR |
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 | ||
a3d2eaf0 | 1880 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1881 | { |
1882 | ||
3f2355cb | 1883 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 1884 | |
7db90f4a LR |
1885 | if (last_request->initiator == |
1886 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
79c97e97 JB |
1887 | struct cfg80211_registered_device *rdev; |
1888 | rdev = cfg80211_rdev_by_wiphy_idx( | |
806a9e39 | 1889 | last_request->wiphy_idx); |
79c97e97 | 1890 | if (rdev) { |
e9c0268f | 1891 | pr_info("Current regulatory domain updated by AP to: %c%c\n", |
79c97e97 JB |
1892 | rdev->country_ie_alpha2[0], |
1893 | rdev->country_ie_alpha2[1]); | |
3f2355cb | 1894 | } else |
e9c0268f | 1895 | pr_info("Current regulatory domain intersected:\n"); |
3f2355cb | 1896 | } else |
e9c0268f | 1897 | pr_info("Current regulatory domain intersected:\n"); |
3f2355cb | 1898 | } else if (is_world_regdom(rd->alpha2)) |
e9c0268f | 1899 | pr_info("World regulatory domain updated:\n"); |
b2e1b302 LR |
1900 | else { |
1901 | if (is_unknown_alpha2(rd->alpha2)) | |
e9c0268f | 1902 | pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n"); |
b2e1b302 | 1903 | else |
e9c0268f | 1904 | pr_info("Regulatory domain changed to country: %c%c\n", |
b2e1b302 LR |
1905 | rd->alpha2[0], rd->alpha2[1]); |
1906 | } | |
1907 | print_rd_rules(rd); | |
1908 | } | |
1909 | ||
2df78167 | 1910 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1911 | { |
e9c0268f | 1912 | pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]); |
b2e1b302 LR |
1913 | print_rd_rules(rd); |
1914 | } | |
1915 | ||
d2372b31 | 1916 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1917 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1918 | { |
9c96477d | 1919 | const struct ieee80211_regdomain *intersected_rd = NULL; |
79c97e97 | 1920 | struct cfg80211_registered_device *rdev = NULL; |
806a9e39 | 1921 | struct wiphy *request_wiphy; |
b2e1b302 LR |
1922 | /* Some basic sanity checks first */ |
1923 | ||
b2e1b302 | 1924 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1925 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1926 | return -EINVAL; |
1927 | update_world_regdomain(rd); | |
1928 | return 0; | |
1929 | } | |
b2e1b302 LR |
1930 | |
1931 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1932 | !is_unknown_alpha2(rd->alpha2)) | |
1933 | return -EINVAL; | |
1934 | ||
f6037d09 | 1935 | if (!last_request) |
b2e1b302 LR |
1936 | return -EINVAL; |
1937 | ||
fb1fc7ad LR |
1938 | /* |
1939 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 1940 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
1941 | * and the pending request came in from a country IE |
1942 | */ | |
7db90f4a | 1943 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
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 | */ | |
baeb66fe | 1948 | if (!regdom_changes(rd->alpha2)) |
3f2355cb LR |
1949 | return -EINVAL; |
1950 | } | |
1951 | ||
fb1fc7ad LR |
1952 | /* |
1953 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
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 | |
fb1fc7ad LR |
1956 | * internal EEPROM data |
1957 | */ | |
b2e1b302 | 1958 | |
f6037d09 | 1959 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1960 | return -EINVAL; |
1961 | ||
8375af3b | 1962 | if (!is_valid_rd(rd)) { |
e9c0268f | 1963 | pr_err("Invalid regulatory domain detected:\n"); |
8375af3b LR |
1964 | print_regdomain_info(rd); |
1965 | return -EINVAL; | |
b2e1b302 LR |
1966 | } |
1967 | ||
806a9e39 LR |
1968 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1969 | ||
b8295acd | 1970 | if (!last_request->intersect) { |
3e0c3ff3 LR |
1971 | int r; |
1972 | ||
7db90f4a | 1973 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
3e0c3ff3 LR |
1974 | reset_regdomains(); |
1975 | cfg80211_regdomain = rd; | |
1976 | return 0; | |
1977 | } | |
1978 | ||
fb1fc7ad LR |
1979 | /* |
1980 | * For a driver hint, lets copy the regulatory domain the | |
1981 | * driver wanted to the wiphy to deal with conflicts | |
1982 | */ | |
3e0c3ff3 | 1983 | |
558f6d32 LR |
1984 | /* |
1985 | * Userspace could have sent two replies with only | |
1986 | * one kernel request. | |
1987 | */ | |
1988 | if (request_wiphy->regd) | |
1989 | return -EALREADY; | |
3e0c3ff3 | 1990 | |
806a9e39 | 1991 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
1992 | if (r) |
1993 | return r; | |
1994 | ||
b8295acd LR |
1995 | reset_regdomains(); |
1996 | cfg80211_regdomain = rd; | |
1997 | return 0; | |
1998 | } | |
1999 | ||
2000 | /* Intersection requires a bit more work */ | |
2001 | ||
7db90f4a | 2002 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 2003 | |
9c96477d LR |
2004 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
2005 | if (!intersected_rd) | |
2006 | return -EINVAL; | |
b8295acd | 2007 | |
fb1fc7ad LR |
2008 | /* |
2009 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 2010 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
2011 | * domain we keep it for its private use |
2012 | */ | |
7db90f4a | 2013 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 2014 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
2015 | else |
2016 | kfree(rd); | |
2017 | ||
b8295acd LR |
2018 | rd = NULL; |
2019 | ||
2020 | reset_regdomains(); | |
2021 | cfg80211_regdomain = intersected_rd; | |
2022 | ||
2023 | return 0; | |
9c96477d LR |
2024 | } |
2025 | ||
3f2355cb LR |
2026 | if (!intersected_rd) |
2027 | return -EINVAL; | |
2028 | ||
79c97e97 | 2029 | rdev = wiphy_to_dev(request_wiphy); |
3f2355cb | 2030 | |
79c97e97 JB |
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; | |
3f2355cb LR |
2034 | |
2035 | BUG_ON(intersected_rd == rd); | |
2036 | ||
2037 | kfree(rd); | |
2038 | rd = NULL; | |
2039 | ||
b8295acd | 2040 | reset_regdomains(); |
3f2355cb | 2041 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2042 | |
2043 | return 0; | |
2044 | } | |
2045 | ||
2046 | ||
fb1fc7ad LR |
2047 | /* |
2048 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2049 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2050 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2051 | */ | |
a3d2eaf0 | 2052 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2053 | { |
b2e1b302 LR |
2054 | int r; |
2055 | ||
761cf7ec LR |
2056 | assert_cfg80211_lock(); |
2057 | ||
abc7381b LR |
2058 | mutex_lock(®_mutex); |
2059 | ||
b2e1b302 LR |
2060 | /* Note that this doesn't update the wiphys, this is done below */ |
2061 | r = __set_regdom(rd); | |
d2372b31 JB |
2062 | if (r) { |
2063 | kfree(rd); | |
abc7381b | 2064 | mutex_unlock(®_mutex); |
b2e1b302 | 2065 | return r; |
d2372b31 | 2066 | } |
b2e1b302 | 2067 | |
b2e1b302 | 2068 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2069 | if (!last_request->intersect) |
2070 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2071 | |
2072 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2073 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2074 | |
a01ddafd | 2075 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2076 | |
73d54c9e LR |
2077 | nl80211_send_reg_change_event(last_request); |
2078 | ||
b2e253cf LR |
2079 | reg_set_request_processed(); |
2080 | ||
abc7381b LR |
2081 | mutex_unlock(®_mutex); |
2082 | ||
b2e1b302 LR |
2083 | return r; |
2084 | } | |
2085 | ||
4d9d88d1 SJR |
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 | ||
a1794390 | 2105 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2106 | void reg_device_remove(struct wiphy *wiphy) |
2107 | { | |
0ad8acaf | 2108 | struct wiphy *request_wiphy = NULL; |
806a9e39 | 2109 | |
761cf7ec LR |
2110 | assert_cfg80211_lock(); |
2111 | ||
abc7381b LR |
2112 | mutex_lock(®_mutex); |
2113 | ||
0ef9ccdd CW |
2114 | kfree(wiphy->regd); |
2115 | ||
0ad8acaf LR |
2116 | if (last_request) |
2117 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
806a9e39 | 2118 | |
0ef9ccdd | 2119 | if (!request_wiphy || request_wiphy != wiphy) |
abc7381b | 2120 | goto out; |
0ef9ccdd | 2121 | |
806a9e39 | 2122 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb | 2123 | last_request->country_ie_env = ENVIRON_ANY; |
abc7381b LR |
2124 | out: |
2125 | mutex_unlock(®_mutex); | |
3f2355cb LR |
2126 | } |
2127 | ||
2fcc9f73 | 2128 | int __init regulatory_init(void) |
b2e1b302 | 2129 | { |
bcf4f99b | 2130 | int err = 0; |
734366de | 2131 | |
b2e1b302 LR |
2132 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2133 | if (IS_ERR(reg_pdev)) | |
2134 | return PTR_ERR(reg_pdev); | |
734366de | 2135 | |
4d9d88d1 SJR |
2136 | reg_pdev->dev.type = ®_device_type; |
2137 | ||
fe33eb39 | 2138 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2139 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2140 | |
a3d2eaf0 | 2141 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2142 | |
09d989d1 LR |
2143 | user_alpha2[0] = '9'; |
2144 | user_alpha2[1] = '7'; | |
2145 | ||
ae9e4b0d LR |
2146 | /* We always try to get an update for the static regdomain */ |
2147 | err = regulatory_hint_core(cfg80211_regdomain->alpha2); | |
ba25c141 | 2148 | if (err) { |
bcf4f99b LR |
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 | */ | |
e9c0268f | 2158 | pr_err("kobject_uevent_env() was unable to call CRDA during init\n"); |
bcf4f99b LR |
2159 | #ifdef CONFIG_CFG80211_REG_DEBUG |
2160 | /* We want to find out exactly why when debugging */ | |
2161 | WARN_ON(err); | |
734366de | 2162 | #endif |
bcf4f99b | 2163 | } |
734366de | 2164 | |
ae9e4b0d LR |
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 | ||
b2e1b302 LR |
2172 | return 0; |
2173 | } | |
2174 | ||
2fcc9f73 | 2175 | void /* __init_or_exit */ regulatory_exit(void) |
b2e1b302 | 2176 | { |
fe33eb39 | 2177 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2178 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2179 | |
2180 | cancel_work_sync(®_work); | |
2181 | ||
a1794390 | 2182 | mutex_lock(&cfg80211_mutex); |
abc7381b | 2183 | mutex_lock(®_mutex); |
734366de | 2184 | |
b2e1b302 | 2185 | reset_regdomains(); |
734366de | 2186 | |
f6037d09 JB |
2187 | kfree(last_request); |
2188 | ||
b2e1b302 | 2189 | platform_device_unregister(reg_pdev); |
734366de | 2190 | |
e38f8a7a LR |
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 | ||
fe33eb39 LR |
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 | ||
abc7381b | 2219 | mutex_unlock(®_mutex); |
a1794390 | 2220 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2221 | } |