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> |
bc3b2d7f | 39 | #include <linux/export.h> |
5a0e3ad6 | 40 | #include <linux/slab.h> |
b2e1b302 LR |
41 | #include <linux/list.h> |
42 | #include <linux/random.h> | |
c61029c7 | 43 | #include <linux/ctype.h> |
b2e1b302 LR |
44 | #include <linux/nl80211.h> |
45 | #include <linux/platform_device.h> | |
d9b93842 | 46 | #include <linux/moduleparam.h> |
b2e1b302 | 47 | #include <net/cfg80211.h> |
8318d78a | 48 | #include "core.h" |
b2e1b302 | 49 | #include "reg.h" |
3b377ea9 | 50 | #include "regdb.h" |
73d54c9e | 51 | #include "nl80211.h" |
8318d78a | 52 | |
4113f751 | 53 | #ifdef CONFIG_CFG80211_REG_DEBUG |
12c5ffb5 JP |
54 | #define REG_DBG_PRINT(format, args...) \ |
55 | printk(KERN_DEBUG pr_fmt(format), ##args) | |
4113f751 | 56 | #else |
8271195e | 57 | #define REG_DBG_PRINT(args...) |
4113f751 LR |
58 | #endif |
59 | ||
a042994d LR |
60 | static struct regulatory_request core_request_world = { |
61 | .initiator = NL80211_REGDOM_SET_BY_CORE, | |
62 | .alpha2[0] = '0', | |
63 | .alpha2[1] = '0', | |
64 | .intersect = false, | |
65 | .processed = true, | |
66 | .country_ie_env = ENVIRON_ANY, | |
67 | }; | |
68 | ||
5166ccd2 | 69 | /* Receipt of information from last regulatory request */ |
a042994d | 70 | static struct regulatory_request *last_request = &core_request_world; |
734366de | 71 | |
b2e1b302 LR |
72 | /* To trigger userspace events */ |
73 | static struct platform_device *reg_pdev; | |
8318d78a | 74 | |
4d9d88d1 SJR |
75 | static struct device_type reg_device_type = { |
76 | .uevent = reg_device_uevent, | |
77 | }; | |
78 | ||
fb1fc7ad LR |
79 | /* |
80 | * Central wireless core regulatory domains, we only need two, | |
734366de | 81 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
82 | * information to give us an alpha2 |
83 | */ | |
f130347c | 84 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 85 | |
abc7381b LR |
86 | /* |
87 | * Protects static reg.c components: | |
88 | * - cfg80211_world_regdom | |
89 | * - cfg80211_regdom | |
abc7381b LR |
90 | * - last_request |
91 | */ | |
670b7f11 | 92 | static DEFINE_MUTEX(reg_mutex); |
46a5ebaf JB |
93 | |
94 | static inline void assert_reg_lock(void) | |
95 | { | |
96 | lockdep_assert_held(®_mutex); | |
97 | } | |
abc7381b | 98 | |
e38f8a7a | 99 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
100 | static LIST_HEAD(reg_requests_list); |
101 | static spinlock_t reg_requests_lock; | |
102 | ||
e38f8a7a LR |
103 | /* Used to queue up beacon hints for review */ |
104 | static LIST_HEAD(reg_pending_beacons); | |
105 | static spinlock_t reg_pending_beacons_lock; | |
106 | ||
107 | /* Used to keep track of processed beacon hints */ | |
108 | static LIST_HEAD(reg_beacon_list); | |
109 | ||
110 | struct reg_beacon { | |
111 | struct list_head list; | |
112 | struct ieee80211_channel chan; | |
113 | }; | |
114 | ||
f333a7a2 LR |
115 | static void reg_todo(struct work_struct *work); |
116 | static DECLARE_WORK(reg_work, reg_todo); | |
117 | ||
a90c7a31 LR |
118 | static void reg_timeout_work(struct work_struct *work); |
119 | static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work); | |
120 | ||
734366de JB |
121 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
122 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 123 | .n_reg_rules = 5, |
734366de JB |
124 | .alpha2 = "00", |
125 | .reg_rules = { | |
68798a62 LR |
126 | /* IEEE 802.11b/g, channels 1..11 */ |
127 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
128 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
129 | * channel fits here. */ | |
130 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
131 | NL80211_RRF_PASSIVE_SCAN | |
132 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
133 | /* IEEE 802.11 channel 14 - Only JP enables |
134 | * this and for 802.11b only */ | |
135 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
136 | NL80211_RRF_PASSIVE_SCAN | | |
137 | NL80211_RRF_NO_IBSS | | |
138 | NL80211_RRF_NO_OFDM), | |
139 | /* IEEE 802.11a, channel 36..48 */ | |
ec329ace | 140 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
141 | NL80211_RRF_PASSIVE_SCAN | |
142 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
143 | |
144 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
145 | ||
146 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 147 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
148 | NL80211_RRF_PASSIVE_SCAN | |
149 | NL80211_RRF_NO_IBSS), | |
734366de JB |
150 | } |
151 | }; | |
152 | ||
a3d2eaf0 JB |
153 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
154 | &world_regdom; | |
734366de | 155 | |
6ee7d330 | 156 | static char *ieee80211_regdom = "00"; |
09d989d1 | 157 | static char user_alpha2[2]; |
6ee7d330 | 158 | |
734366de JB |
159 | module_param(ieee80211_regdom, charp, 0444); |
160 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
161 | ||
a042994d | 162 | static void reset_regdomains(bool full_reset) |
734366de | 163 | { |
942b25cf JB |
164 | /* avoid freeing static information or freeing something twice */ |
165 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
166 | cfg80211_regdomain = NULL; | |
167 | if (cfg80211_world_regdom == &world_regdom) | |
168 | cfg80211_world_regdom = NULL; | |
169 | if (cfg80211_regdomain == &world_regdom) | |
170 | cfg80211_regdomain = NULL; | |
942b25cf JB |
171 | |
172 | kfree(cfg80211_regdomain); | |
173 | kfree(cfg80211_world_regdom); | |
734366de | 174 | |
a3d2eaf0 | 175 | cfg80211_world_regdom = &world_regdom; |
734366de | 176 | cfg80211_regdomain = NULL; |
a042994d LR |
177 | |
178 | if (!full_reset) | |
179 | return; | |
180 | ||
181 | if (last_request != &core_request_world) | |
182 | kfree(last_request); | |
183 | last_request = &core_request_world; | |
734366de JB |
184 | } |
185 | ||
fb1fc7ad LR |
186 | /* |
187 | * Dynamic world regulatory domain requested by the wireless | |
188 | * core upon initialization | |
189 | */ | |
a3d2eaf0 | 190 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 191 | { |
f6037d09 | 192 | BUG_ON(!last_request); |
734366de | 193 | |
a042994d | 194 | reset_regdomains(false); |
734366de JB |
195 | |
196 | cfg80211_world_regdom = rd; | |
197 | cfg80211_regdomain = rd; | |
198 | } | |
734366de | 199 | |
a3d2eaf0 | 200 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
201 | { |
202 | if (!alpha2) | |
203 | return false; | |
204 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
205 | return true; | |
206 | return false; | |
207 | } | |
8318d78a | 208 | |
a3d2eaf0 | 209 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
210 | { |
211 | if (!alpha2) | |
212 | return false; | |
213 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
214 | return true; | |
215 | return false; | |
216 | } | |
8318d78a | 217 | |
a3d2eaf0 | 218 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
219 | { |
220 | if (!alpha2) | |
221 | return false; | |
fb1fc7ad LR |
222 | /* |
223 | * Special case where regulatory domain was built by driver | |
224 | * but a specific alpha2 cannot be determined | |
225 | */ | |
b2e1b302 LR |
226 | if (alpha2[0] == '9' && alpha2[1] == '9') |
227 | return true; | |
228 | return false; | |
229 | } | |
8318d78a | 230 | |
3f2355cb LR |
231 | static bool is_intersected_alpha2(const char *alpha2) |
232 | { | |
233 | if (!alpha2) | |
234 | return false; | |
fb1fc7ad LR |
235 | /* |
236 | * Special case where regulatory domain is the | |
3f2355cb | 237 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
238 | * structures |
239 | */ | |
3f2355cb LR |
240 | if (alpha2[0] == '9' && alpha2[1] == '8') |
241 | return true; | |
242 | return false; | |
243 | } | |
244 | ||
a3d2eaf0 | 245 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
246 | { |
247 | if (!alpha2) | |
248 | return false; | |
c61029c7 | 249 | if (isalpha(alpha2[0]) && isalpha(alpha2[1])) |
b2e1b302 LR |
250 | return true; |
251 | return false; | |
252 | } | |
8318d78a | 253 | |
a3d2eaf0 | 254 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
255 | { |
256 | if (!alpha2_x || !alpha2_y) | |
257 | return false; | |
258 | if (alpha2_x[0] == alpha2_y[0] && | |
259 | alpha2_x[1] == alpha2_y[1]) | |
260 | return true; | |
261 | return false; | |
262 | } | |
263 | ||
69b1572b | 264 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 265 | { |
761cf7ec LR |
266 | assert_cfg80211_lock(); |
267 | ||
b2e1b302 LR |
268 | if (!cfg80211_regdomain) |
269 | return true; | |
270 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
271 | return false; | |
272 | return true; | |
273 | } | |
274 | ||
09d989d1 LR |
275 | /* |
276 | * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets | |
277 | * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER | |
278 | * has ever been issued. | |
279 | */ | |
280 | static bool is_user_regdom_saved(void) | |
281 | { | |
282 | if (user_alpha2[0] == '9' && user_alpha2[1] == '7') | |
283 | return false; | |
284 | ||
285 | /* This would indicate a mistake on the design */ | |
286 | if (WARN((!is_world_regdom(user_alpha2) && | |
287 | !is_an_alpha2(user_alpha2)), | |
288 | "Unexpected user alpha2: %c%c\n", | |
289 | user_alpha2[0], | |
290 | user_alpha2[1])) | |
291 | return false; | |
292 | ||
293 | return true; | |
294 | } | |
295 | ||
3b377ea9 JL |
296 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
297 | const struct ieee80211_regdomain *src_regd) | |
298 | { | |
299 | struct ieee80211_regdomain *regd; | |
300 | int size_of_regd = 0; | |
301 | unsigned int i; | |
302 | ||
303 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
304 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
305 | ||
306 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
307 | if (!regd) | |
308 | return -ENOMEM; | |
309 | ||
310 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
311 | ||
312 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
313 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
314 | sizeof(struct ieee80211_reg_rule)); | |
315 | ||
316 | *dst_regd = regd; | |
317 | return 0; | |
318 | } | |
319 | ||
320 | #ifdef CONFIG_CFG80211_INTERNAL_REGDB | |
321 | struct reg_regdb_search_request { | |
322 | char alpha2[2]; | |
323 | struct list_head list; | |
324 | }; | |
325 | ||
326 | static LIST_HEAD(reg_regdb_search_list); | |
368d06f5 | 327 | static DEFINE_MUTEX(reg_regdb_search_mutex); |
3b377ea9 JL |
328 | |
329 | static void reg_regdb_search(struct work_struct *work) | |
330 | { | |
331 | struct reg_regdb_search_request *request; | |
332 | const struct ieee80211_regdomain *curdom, *regdom; | |
333 | int i, r; | |
334 | ||
368d06f5 | 335 | mutex_lock(®_regdb_search_mutex); |
3b377ea9 JL |
336 | while (!list_empty(®_regdb_search_list)) { |
337 | request = list_first_entry(®_regdb_search_list, | |
338 | struct reg_regdb_search_request, | |
339 | list); | |
340 | list_del(&request->list); | |
341 | ||
342 | for (i=0; i<reg_regdb_size; i++) { | |
343 | curdom = reg_regdb[i]; | |
344 | ||
345 | if (!memcmp(request->alpha2, curdom->alpha2, 2)) { | |
346 | r = reg_copy_regd(®dom, curdom); | |
347 | if (r) | |
348 | break; | |
3b377ea9 JL |
349 | mutex_lock(&cfg80211_mutex); |
350 | set_regdom(regdom); | |
351 | mutex_unlock(&cfg80211_mutex); | |
3b377ea9 JL |
352 | break; |
353 | } | |
354 | } | |
355 | ||
356 | kfree(request); | |
357 | } | |
368d06f5 | 358 | mutex_unlock(®_regdb_search_mutex); |
3b377ea9 JL |
359 | } |
360 | ||
361 | static DECLARE_WORK(reg_regdb_work, reg_regdb_search); | |
362 | ||
363 | static void reg_regdb_query(const char *alpha2) | |
364 | { | |
365 | struct reg_regdb_search_request *request; | |
366 | ||
367 | if (!alpha2) | |
368 | return; | |
369 | ||
370 | request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL); | |
371 | if (!request) | |
372 | return; | |
373 | ||
374 | memcpy(request->alpha2, alpha2, 2); | |
375 | ||
368d06f5 | 376 | mutex_lock(®_regdb_search_mutex); |
3b377ea9 | 377 | list_add_tail(&request->list, ®_regdb_search_list); |
368d06f5 | 378 | mutex_unlock(®_regdb_search_mutex); |
3b377ea9 JL |
379 | |
380 | schedule_work(®_regdb_work); | |
381 | } | |
382 | #else | |
383 | static inline void reg_regdb_query(const char *alpha2) {} | |
384 | #endif /* CONFIG_CFG80211_INTERNAL_REGDB */ | |
385 | ||
fb1fc7ad LR |
386 | /* |
387 | * This lets us keep regulatory code which is updated on a regulatory | |
4d9d88d1 SJR |
388 | * basis in userspace. Country information is filled in by |
389 | * reg_device_uevent | |
fb1fc7ad | 390 | */ |
b2e1b302 LR |
391 | static int call_crda(const char *alpha2) |
392 | { | |
b2e1b302 | 393 | if (!is_world_regdom((char *) alpha2)) |
e9c0268f | 394 | pr_info("Calling CRDA for country: %c%c\n", |
b2e1b302 LR |
395 | alpha2[0], alpha2[1]); |
396 | else | |
e9c0268f | 397 | pr_info("Calling CRDA to update world regulatory domain\n"); |
b2e1b302 | 398 | |
3b377ea9 JL |
399 | /* query internal regulatory database (if it exists) */ |
400 | reg_regdb_query(alpha2); | |
401 | ||
4d9d88d1 | 402 | return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE); |
b2e1b302 LR |
403 | } |
404 | ||
b2e1b302 | 405 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 406 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 407 | { |
61405e97 LR |
408 | assert_cfg80211_lock(); |
409 | ||
f6037d09 JB |
410 | if (!last_request) |
411 | return false; | |
412 | ||
413 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 414 | } |
8318d78a | 415 | |
b2e1b302 | 416 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 417 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 418 | { |
a3d2eaf0 | 419 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
420 | u32 freq_diff; |
421 | ||
91e99004 | 422 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
423 | return false; |
424 | ||
425 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
426 | return false; | |
427 | ||
428 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
429 | ||
bd05f28e RK |
430 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
431 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
432 | return false; |
433 | ||
434 | return true; | |
435 | } | |
436 | ||
a3d2eaf0 | 437 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 438 | { |
a3d2eaf0 | 439 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 440 | unsigned int i; |
8318d78a | 441 | |
b2e1b302 LR |
442 | if (!rd->n_reg_rules) |
443 | return false; | |
8318d78a | 444 | |
88dc1c3f LR |
445 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
446 | return false; | |
447 | ||
b2e1b302 LR |
448 | for (i = 0; i < rd->n_reg_rules; i++) { |
449 | reg_rule = &rd->reg_rules[i]; | |
450 | if (!is_valid_reg_rule(reg_rule)) | |
451 | return false; | |
452 | } | |
453 | ||
454 | return true; | |
8318d78a JB |
455 | } |
456 | ||
038659e7 LR |
457 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, |
458 | u32 center_freq_khz, | |
459 | u32 bw_khz) | |
b2e1b302 | 460 | { |
038659e7 LR |
461 | u32 start_freq_khz, end_freq_khz; |
462 | ||
463 | start_freq_khz = center_freq_khz - (bw_khz/2); | |
464 | end_freq_khz = center_freq_khz + (bw_khz/2); | |
465 | ||
466 | if (start_freq_khz >= freq_range->start_freq_khz && | |
467 | end_freq_khz <= freq_range->end_freq_khz) | |
468 | return true; | |
469 | ||
470 | return false; | |
b2e1b302 | 471 | } |
8318d78a | 472 | |
0c7dc45d LR |
473 | /** |
474 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
475 | * @freq_range: frequency rule we want to query | |
476 | * @freq_khz: frequency we are inquiring about | |
477 | * | |
478 | * This lets us know if a specific frequency rule is or is not relevant to | |
479 | * a specific frequency's band. Bands are device specific and artificial | |
480 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
481 | * safe for now to assume that a frequency rule should not be part of a | |
482 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
483 | * This resolution can be lowered and should be considered as we add | |
484 | * regulatory rule support for other "bands". | |
485 | **/ | |
486 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
487 | u32 freq_khz) | |
488 | { | |
489 | #define ONE_GHZ_IN_KHZ 1000000 | |
490 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
491 | return true; | |
492 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
493 | return true; | |
494 | return false; | |
495 | #undef ONE_GHZ_IN_KHZ | |
496 | } | |
497 | ||
fb1fc7ad LR |
498 | /* |
499 | * Helper for regdom_intersect(), this does the real | |
500 | * mathematical intersection fun | |
501 | */ | |
9c96477d LR |
502 | static int reg_rules_intersect( |
503 | const struct ieee80211_reg_rule *rule1, | |
504 | const struct ieee80211_reg_rule *rule2, | |
505 | struct ieee80211_reg_rule *intersected_rule) | |
506 | { | |
507 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
508 | struct ieee80211_freq_range *freq_range; | |
509 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
510 | struct ieee80211_power_rule *power_rule; | |
511 | u32 freq_diff; | |
512 | ||
513 | freq_range1 = &rule1->freq_range; | |
514 | freq_range2 = &rule2->freq_range; | |
515 | freq_range = &intersected_rule->freq_range; | |
516 | ||
517 | power_rule1 = &rule1->power_rule; | |
518 | power_rule2 = &rule2->power_rule; | |
519 | power_rule = &intersected_rule->power_rule; | |
520 | ||
521 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
522 | freq_range2->start_freq_khz); | |
523 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
524 | freq_range2->end_freq_khz); | |
525 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
526 | freq_range2->max_bandwidth_khz); | |
527 | ||
528 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
529 | if (freq_range->max_bandwidth_khz > freq_diff) | |
530 | freq_range->max_bandwidth_khz = freq_diff; | |
531 | ||
532 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
533 | power_rule2->max_eirp); | |
534 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
535 | power_rule2->max_antenna_gain); | |
536 | ||
537 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
538 | ||
539 | if (!is_valid_reg_rule(intersected_rule)) | |
540 | return -EINVAL; | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | /** | |
546 | * regdom_intersect - do the intersection between two regulatory domains | |
547 | * @rd1: first regulatory domain | |
548 | * @rd2: second regulatory domain | |
549 | * | |
550 | * Use this function to get the intersection between two regulatory domains. | |
551 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
552 | * as no one single alpha2 can represent this regulatory domain. | |
553 | * | |
554 | * Returns a pointer to the regulatory domain structure which will hold the | |
555 | * resulting intersection of rules between rd1 and rd2. We will | |
556 | * kzalloc() this structure for you. | |
557 | */ | |
558 | static struct ieee80211_regdomain *regdom_intersect( | |
559 | const struct ieee80211_regdomain *rd1, | |
560 | const struct ieee80211_regdomain *rd2) | |
561 | { | |
562 | int r, size_of_regd; | |
563 | unsigned int x, y; | |
564 | unsigned int num_rules = 0, rule_idx = 0; | |
565 | const struct ieee80211_reg_rule *rule1, *rule2; | |
566 | struct ieee80211_reg_rule *intersected_rule; | |
567 | struct ieee80211_regdomain *rd; | |
568 | /* This is just a dummy holder to help us count */ | |
569 | struct ieee80211_reg_rule irule; | |
570 | ||
571 | /* Uses the stack temporarily for counter arithmetic */ | |
572 | intersected_rule = &irule; | |
573 | ||
574 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
575 | ||
576 | if (!rd1 || !rd2) | |
577 | return NULL; | |
578 | ||
fb1fc7ad LR |
579 | /* |
580 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
581 | * build them. This is to so we can malloc() and free() a |
582 | * regdomain once. The reason we use reg_rules_intersect() here | |
583 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
584 | * All rules that do check out OK are valid. |
585 | */ | |
9c96477d LR |
586 | |
587 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
588 | rule1 = &rd1->reg_rules[x]; | |
589 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
590 | rule2 = &rd2->reg_rules[y]; | |
591 | if (!reg_rules_intersect(rule1, rule2, | |
592 | intersected_rule)) | |
593 | num_rules++; | |
594 | memset(intersected_rule, 0, | |
595 | sizeof(struct ieee80211_reg_rule)); | |
596 | } | |
597 | } | |
598 | ||
599 | if (!num_rules) | |
600 | return NULL; | |
601 | ||
602 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
603 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
604 | ||
605 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
606 | if (!rd) | |
607 | return NULL; | |
608 | ||
609 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
610 | rule1 = &rd1->reg_rules[x]; | |
611 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
612 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
613 | /* |
614 | * This time around instead of using the stack lets | |
9c96477d | 615 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
616 | * a memcpy() |
617 | */ | |
9c96477d LR |
618 | intersected_rule = &rd->reg_rules[rule_idx]; |
619 | r = reg_rules_intersect(rule1, rule2, | |
620 | intersected_rule); | |
fb1fc7ad LR |
621 | /* |
622 | * No need to memset here the intersected rule here as | |
623 | * we're not using the stack anymore | |
624 | */ | |
9c96477d LR |
625 | if (r) |
626 | continue; | |
627 | rule_idx++; | |
628 | } | |
629 | } | |
630 | ||
631 | if (rule_idx != num_rules) { | |
632 | kfree(rd); | |
633 | return NULL; | |
634 | } | |
635 | ||
636 | rd->n_reg_rules = num_rules; | |
637 | rd->alpha2[0] = '9'; | |
638 | rd->alpha2[1] = '8'; | |
639 | ||
640 | return rd; | |
641 | } | |
642 | ||
fb1fc7ad LR |
643 | /* |
644 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
645 | * want to just have the channel structure use these | |
646 | */ | |
b2e1b302 LR |
647 | static u32 map_regdom_flags(u32 rd_flags) |
648 | { | |
649 | u32 channel_flags = 0; | |
650 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
651 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
652 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
653 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
654 | if (rd_flags & NL80211_RRF_DFS) | |
655 | channel_flags |= IEEE80211_CHAN_RADAR; | |
656 | return channel_flags; | |
657 | } | |
658 | ||
1fa25e41 LR |
659 | static int freq_reg_info_regd(struct wiphy *wiphy, |
660 | u32 center_freq, | |
038659e7 | 661 | u32 desired_bw_khz, |
1fa25e41 LR |
662 | const struct ieee80211_reg_rule **reg_rule, |
663 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
664 | { |
665 | int i; | |
0c7dc45d | 666 | bool band_rule_found = false; |
3e0c3ff3 | 667 | const struct ieee80211_regdomain *regd; |
038659e7 LR |
668 | bool bw_fits = false; |
669 | ||
670 | if (!desired_bw_khz) | |
671 | desired_bw_khz = MHZ_TO_KHZ(20); | |
8318d78a | 672 | |
1fa25e41 | 673 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 674 | |
fb1fc7ad LR |
675 | /* |
676 | * Follow the driver's regulatory domain, if present, unless a country | |
677 | * IE has been processed or a user wants to help complaince further | |
678 | */ | |
2784fe91 LR |
679 | if (!custom_regd && |
680 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
7db90f4a | 681 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && |
3e0c3ff3 LR |
682 | wiphy->regd) |
683 | regd = wiphy->regd; | |
684 | ||
685 | if (!regd) | |
b2e1b302 LR |
686 | return -EINVAL; |
687 | ||
3e0c3ff3 | 688 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
689 | const struct ieee80211_reg_rule *rr; |
690 | const struct ieee80211_freq_range *fr = NULL; | |
b2e1b302 | 691 | |
3e0c3ff3 | 692 | rr = ®d->reg_rules[i]; |
b2e1b302 | 693 | fr = &rr->freq_range; |
0c7dc45d | 694 | |
fb1fc7ad LR |
695 | /* |
696 | * We only need to know if one frequency rule was | |
0c7dc45d | 697 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
698 | * not overwrite it once found |
699 | */ | |
0c7dc45d LR |
700 | if (!band_rule_found) |
701 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
702 | ||
038659e7 LR |
703 | bw_fits = reg_does_bw_fit(fr, |
704 | center_freq, | |
705 | desired_bw_khz); | |
0c7dc45d | 706 | |
038659e7 | 707 | if (band_rule_found && bw_fits) { |
b2e1b302 | 708 | *reg_rule = rr; |
038659e7 | 709 | return 0; |
8318d78a JB |
710 | } |
711 | } | |
712 | ||
0c7dc45d LR |
713 | if (!band_rule_found) |
714 | return -ERANGE; | |
715 | ||
038659e7 | 716 | return -EINVAL; |
b2e1b302 LR |
717 | } |
718 | ||
038659e7 LR |
719 | int freq_reg_info(struct wiphy *wiphy, |
720 | u32 center_freq, | |
721 | u32 desired_bw_khz, | |
722 | const struct ieee80211_reg_rule **reg_rule) | |
1fa25e41 | 723 | { |
ac46d48e | 724 | assert_cfg80211_lock(); |
038659e7 LR |
725 | return freq_reg_info_regd(wiphy, |
726 | center_freq, | |
727 | desired_bw_khz, | |
728 | reg_rule, | |
729 | NULL); | |
1fa25e41 | 730 | } |
4f366c5d | 731 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 732 | |
926a0a09 LR |
733 | #ifdef CONFIG_CFG80211_REG_DEBUG |
734 | static const char *reg_initiator_name(enum nl80211_reg_initiator initiator) | |
735 | { | |
736 | switch (initiator) { | |
737 | case NL80211_REGDOM_SET_BY_CORE: | |
738 | return "Set by core"; | |
739 | case NL80211_REGDOM_SET_BY_USER: | |
740 | return "Set by user"; | |
741 | case NL80211_REGDOM_SET_BY_DRIVER: | |
742 | return "Set by driver"; | |
743 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
744 | return "Set by country IE"; | |
745 | default: | |
746 | WARN_ON(1); | |
747 | return "Set by bug"; | |
748 | } | |
749 | } | |
e702d3cf LR |
750 | |
751 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, | |
752 | u32 desired_bw_khz, | |
753 | const struct ieee80211_reg_rule *reg_rule) | |
754 | { | |
755 | const struct ieee80211_power_rule *power_rule; | |
756 | const struct ieee80211_freq_range *freq_range; | |
757 | char max_antenna_gain[32]; | |
758 | ||
759 | power_rule = ®_rule->power_rule; | |
760 | freq_range = ®_rule->freq_range; | |
761 | ||
762 | if (!power_rule->max_antenna_gain) | |
763 | snprintf(max_antenna_gain, 32, "N/A"); | |
764 | else | |
765 | snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain); | |
766 | ||
d91e41b6 | 767 | REG_DBG_PRINT("Updating information on frequency %d MHz " |
ff039c6f | 768 | "for a %d MHz width channel with regulatory rule:\n", |
e702d3cf LR |
769 | chan->center_freq, |
770 | KHZ_TO_MHZ(desired_bw_khz)); | |
771 | ||
56e6786e | 772 | REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n", |
e702d3cf LR |
773 | freq_range->start_freq_khz, |
774 | freq_range->end_freq_khz, | |
56e6786e | 775 | freq_range->max_bandwidth_khz, |
e702d3cf LR |
776 | max_antenna_gain, |
777 | power_rule->max_eirp); | |
778 | } | |
779 | #else | |
780 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, | |
781 | u32 desired_bw_khz, | |
782 | const struct ieee80211_reg_rule *reg_rule) | |
783 | { | |
784 | return; | |
785 | } | |
926a0a09 LR |
786 | #endif |
787 | ||
038659e7 LR |
788 | /* |
789 | * Note that right now we assume the desired channel bandwidth | |
790 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz | |
791 | * per channel, the primary and the extension channel). To support | |
792 | * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a | |
793 | * new ieee80211_channel.target_bw and re run the regulatory check | |
794 | * on the wiphy with the target_bw specified. Then we can simply use | |
795 | * that below for the desired_bw_khz below. | |
796 | */ | |
7ca43d03 LR |
797 | static void handle_channel(struct wiphy *wiphy, |
798 | enum nl80211_reg_initiator initiator, | |
799 | enum ieee80211_band band, | |
a92a3ce7 | 800 | unsigned int chan_idx) |
b2e1b302 LR |
801 | { |
802 | int r; | |
038659e7 LR |
803 | u32 flags, bw_flags = 0; |
804 | u32 desired_bw_khz = MHZ_TO_KHZ(20); | |
b2e1b302 LR |
805 | const struct ieee80211_reg_rule *reg_rule = NULL; |
806 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 807 | const struct ieee80211_freq_range *freq_range = NULL; |
a92a3ce7 LR |
808 | struct ieee80211_supported_band *sband; |
809 | struct ieee80211_channel *chan; | |
fe33eb39 | 810 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 811 | |
761cf7ec LR |
812 | assert_cfg80211_lock(); |
813 | ||
806a9e39 LR |
814 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
815 | ||
a92a3ce7 LR |
816 | sband = wiphy->bands[band]; |
817 | BUG_ON(chan_idx >= sband->n_channels); | |
818 | chan = &sband->channels[chan_idx]; | |
819 | ||
820 | flags = chan->orig_flags; | |
b2e1b302 | 821 | |
038659e7 LR |
822 | r = freq_reg_info(wiphy, |
823 | MHZ_TO_KHZ(chan->center_freq), | |
824 | desired_bw_khz, | |
825 | ®_rule); | |
b2e1b302 | 826 | |
ca4ffe8f LR |
827 | if (r) { |
828 | /* | |
829 | * We will disable all channels that do not match our | |
25985edc | 830 | * received regulatory rule unless the hint is coming |
ca4ffe8f LR |
831 | * from a Country IE and the Country IE had no information |
832 | * about a band. The IEEE 802.11 spec allows for an AP | |
833 | * to send only a subset of the regulatory rules allowed, | |
834 | * so an AP in the US that only supports 2.4 GHz may only send | |
835 | * a country IE with information for the 2.4 GHz band | |
836 | * while 5 GHz is still supported. | |
837 | */ | |
838 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
839 | r == -ERANGE) | |
840 | return; | |
841 | ||
d91e41b6 | 842 | REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq); |
ca4ffe8f | 843 | chan->flags = IEEE80211_CHAN_DISABLED; |
8318d78a | 844 | return; |
ca4ffe8f | 845 | } |
8318d78a | 846 | |
e702d3cf LR |
847 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
848 | ||
b2e1b302 | 849 | power_rule = ®_rule->power_rule; |
038659e7 LR |
850 | freq_range = ®_rule->freq_range; |
851 | ||
852 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
853 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
b2e1b302 | 854 | |
7db90f4a | 855 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
806a9e39 | 856 | request_wiphy && request_wiphy == wiphy && |
5be83de5 | 857 | request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
fb1fc7ad | 858 | /* |
25985edc | 859 | * This guarantees the driver's requested regulatory domain |
f976376d | 860 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
861 | * settings |
862 | */ | |
f976376d | 863 | chan->flags = chan->orig_flags = |
038659e7 | 864 | map_regdom_flags(reg_rule->flags) | bw_flags; |
f976376d LR |
865 | chan->max_antenna_gain = chan->orig_mag = |
866 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
f976376d LR |
867 | chan->max_power = chan->orig_mpwr = |
868 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
869 | return; | |
870 | } | |
871 | ||
aa3d7eef | 872 | chan->beacon_found = false; |
038659e7 | 873 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 874 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 | 875 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
061acaae LR |
876 | if (chan->orig_mpwr) { |
877 | /* | |
878 | * Devices that have their own custom regulatory domain | |
879 | * but also use WIPHY_FLAG_STRICT_REGULATORY will follow the | |
880 | * passed country IE power settings. | |
881 | */ | |
882 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
883 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY && | |
884 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { | |
885 | chan->max_power = | |
886 | MBM_TO_DBM(power_rule->max_eirp); | |
887 | } else { | |
888 | chan->max_power = min(chan->orig_mpwr, | |
889 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
890 | } | |
891 | } else | |
b2e1b302 | 892 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
893 | } |
894 | ||
7ca43d03 LR |
895 | static void handle_band(struct wiphy *wiphy, |
896 | enum ieee80211_band band, | |
897 | enum nl80211_reg_initiator initiator) | |
8318d78a | 898 | { |
a92a3ce7 LR |
899 | unsigned int i; |
900 | struct ieee80211_supported_band *sband; | |
901 | ||
902 | BUG_ON(!wiphy->bands[band]); | |
903 | sband = wiphy->bands[band]; | |
8318d78a JB |
904 | |
905 | for (i = 0; i < sband->n_channels; i++) | |
7ca43d03 | 906 | handle_channel(wiphy, initiator, band, i); |
8318d78a JB |
907 | } |
908 | ||
7db90f4a LR |
909 | static bool ignore_reg_update(struct wiphy *wiphy, |
910 | enum nl80211_reg_initiator initiator) | |
14b9815a | 911 | { |
926a0a09 | 912 | if (!last_request) { |
d91e41b6 | 913 | REG_DBG_PRINT("Ignoring regulatory request %s since " |
926a0a09 LR |
914 | "last_request is not set\n", |
915 | reg_initiator_name(initiator)); | |
14b9815a | 916 | return true; |
926a0a09 LR |
917 | } |
918 | ||
7db90f4a | 919 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
926a0a09 | 920 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { |
d91e41b6 | 921 | REG_DBG_PRINT("Ignoring regulatory request %s " |
926a0a09 | 922 | "since the driver uses its own custom " |
12c5ffb5 | 923 | "regulatory domain\n", |
926a0a09 | 924 | reg_initiator_name(initiator)); |
14b9815a | 925 | return true; |
926a0a09 LR |
926 | } |
927 | ||
fb1fc7ad LR |
928 | /* |
929 | * wiphy->regd will be set once the device has its own | |
930 | * desired regulatory domain set | |
931 | */ | |
5be83de5 | 932 | if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && |
749b527b | 933 | initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
926a0a09 | 934 | !is_world_regdom(last_request->alpha2)) { |
d91e41b6 | 935 | REG_DBG_PRINT("Ignoring regulatory request %s " |
5bc91db8 | 936 | "since the driver requires its own regulatory " |
12c5ffb5 | 937 | "domain to be set first\n", |
926a0a09 | 938 | reg_initiator_name(initiator)); |
14b9815a | 939 | return true; |
926a0a09 LR |
940 | } |
941 | ||
14b9815a LR |
942 | return false; |
943 | } | |
944 | ||
e38f8a7a LR |
945 | static void handle_reg_beacon(struct wiphy *wiphy, |
946 | unsigned int chan_idx, | |
947 | struct reg_beacon *reg_beacon) | |
948 | { | |
e38f8a7a LR |
949 | struct ieee80211_supported_band *sband; |
950 | struct ieee80211_channel *chan; | |
6bad8766 LR |
951 | bool channel_changed = false; |
952 | struct ieee80211_channel chan_before; | |
e38f8a7a LR |
953 | |
954 | assert_cfg80211_lock(); | |
955 | ||
956 | sband = wiphy->bands[reg_beacon->chan.band]; | |
957 | chan = &sband->channels[chan_idx]; | |
958 | ||
959 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
960 | return; | |
961 | ||
6bad8766 LR |
962 | if (chan->beacon_found) |
963 | return; | |
964 | ||
965 | chan->beacon_found = true; | |
966 | ||
5be83de5 | 967 | if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) |
37184244 LR |
968 | return; |
969 | ||
6bad8766 LR |
970 | chan_before.center_freq = chan->center_freq; |
971 | chan_before.flags = chan->flags; | |
972 | ||
37184244 | 973 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { |
e38f8a7a | 974 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; |
6bad8766 | 975 | channel_changed = true; |
e38f8a7a LR |
976 | } |
977 | ||
37184244 | 978 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { |
e38f8a7a | 979 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; |
6bad8766 | 980 | channel_changed = true; |
e38f8a7a LR |
981 | } |
982 | ||
6bad8766 LR |
983 | if (channel_changed) |
984 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
e38f8a7a LR |
985 | } |
986 | ||
987 | /* | |
988 | * Called when a scan on a wiphy finds a beacon on | |
989 | * new channel | |
990 | */ | |
991 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
992 | struct reg_beacon *reg_beacon) | |
993 | { | |
994 | unsigned int i; | |
995 | struct ieee80211_supported_band *sband; | |
996 | ||
997 | assert_cfg80211_lock(); | |
998 | ||
999 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1000 | return; | |
1001 | ||
1002 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1003 | ||
1004 | for (i = 0; i < sband->n_channels; i++) | |
1005 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * Called upon reg changes or a new wiphy is added | |
1010 | */ | |
1011 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1012 | { | |
1013 | unsigned int i; | |
1014 | struct ieee80211_supported_band *sband; | |
1015 | struct reg_beacon *reg_beacon; | |
1016 | ||
1017 | assert_cfg80211_lock(); | |
1018 | ||
1019 | if (list_empty(®_beacon_list)) | |
1020 | return; | |
1021 | ||
1022 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1023 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1024 | continue; | |
1025 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1026 | for (i = 0; i < sband->n_channels; i++) | |
1027 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1032 | { | |
1033 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1034 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1035 | return true; | |
b1ed8ddd LR |
1036 | if (last_request && |
1037 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
5be83de5 | 1038 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) |
e38f8a7a LR |
1039 | return true; |
1040 | return false; | |
1041 | } | |
1042 | ||
1043 | /* Reap the advantages of previously found beacons */ | |
1044 | static void reg_process_beacons(struct wiphy *wiphy) | |
1045 | { | |
b1ed8ddd LR |
1046 | /* |
1047 | * Means we are just firing up cfg80211, so no beacons would | |
1048 | * have been processed yet. | |
1049 | */ | |
1050 | if (!last_request) | |
1051 | return; | |
e38f8a7a LR |
1052 | if (!reg_is_world_roaming(wiphy)) |
1053 | return; | |
1054 | wiphy_update_beacon_reg(wiphy); | |
1055 | } | |
1056 | ||
038659e7 LR |
1057 | static bool is_ht40_not_allowed(struct ieee80211_channel *chan) |
1058 | { | |
1059 | if (!chan) | |
1060 | return true; | |
1061 | if (chan->flags & IEEE80211_CHAN_DISABLED) | |
1062 | return true; | |
1063 | /* This would happen when regulatory rules disallow HT40 completely */ | |
1064 | if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) | |
1065 | return true; | |
1066 | return false; | |
1067 | } | |
1068 | ||
1069 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, | |
1070 | enum ieee80211_band band, | |
1071 | unsigned int chan_idx) | |
1072 | { | |
1073 | struct ieee80211_supported_band *sband; | |
1074 | struct ieee80211_channel *channel; | |
1075 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; | |
1076 | unsigned int i; | |
1077 | ||
1078 | assert_cfg80211_lock(); | |
1079 | ||
1080 | sband = wiphy->bands[band]; | |
1081 | BUG_ON(chan_idx >= sband->n_channels); | |
1082 | channel = &sband->channels[chan_idx]; | |
1083 | ||
1084 | if (is_ht40_not_allowed(channel)) { | |
1085 | channel->flags |= IEEE80211_CHAN_NO_HT40; | |
1086 | return; | |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * We need to ensure the extension channels exist to | |
1091 | * be able to use HT40- or HT40+, this finds them (or not) | |
1092 | */ | |
1093 | for (i = 0; i < sband->n_channels; i++) { | |
1094 | struct ieee80211_channel *c = &sband->channels[i]; | |
1095 | if (c->center_freq == (channel->center_freq - 20)) | |
1096 | channel_before = c; | |
1097 | if (c->center_freq == (channel->center_freq + 20)) | |
1098 | channel_after = c; | |
1099 | } | |
1100 | ||
1101 | /* | |
1102 | * Please note that this assumes target bandwidth is 20 MHz, | |
1103 | * if that ever changes we also need to change the below logic | |
1104 | * to include that as well. | |
1105 | */ | |
1106 | if (is_ht40_not_allowed(channel_before)) | |
689da1b3 | 1107 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 | 1108 | else |
689da1b3 | 1109 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 LR |
1110 | |
1111 | if (is_ht40_not_allowed(channel_after)) | |
689da1b3 | 1112 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 | 1113 | else |
689da1b3 | 1114 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 LR |
1115 | } |
1116 | ||
1117 | static void reg_process_ht_flags_band(struct wiphy *wiphy, | |
1118 | enum ieee80211_band band) | |
1119 | { | |
1120 | unsigned int i; | |
1121 | struct ieee80211_supported_band *sband; | |
1122 | ||
1123 | BUG_ON(!wiphy->bands[band]); | |
1124 | sband = wiphy->bands[band]; | |
1125 | ||
1126 | for (i = 0; i < sband->n_channels; i++) | |
1127 | reg_process_ht_flags_channel(wiphy, band, i); | |
1128 | } | |
1129 | ||
1130 | static void reg_process_ht_flags(struct wiphy *wiphy) | |
1131 | { | |
1132 | enum ieee80211_band band; | |
1133 | ||
1134 | if (!wiphy) | |
1135 | return; | |
1136 | ||
1137 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1138 | if (wiphy->bands[band]) | |
1139 | reg_process_ht_flags_band(wiphy, band); | |
1140 | } | |
1141 | ||
1142 | } | |
1143 | ||
eac03e38 SN |
1144 | static void wiphy_update_regulatory(struct wiphy *wiphy, |
1145 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1146 | { |
1147 | enum ieee80211_band band; | |
d46e5b1d | 1148 | |
eac03e38 SN |
1149 | assert_reg_lock(); |
1150 | ||
7db90f4a | 1151 | if (ignore_reg_update(wiphy, initiator)) |
a203c2aa SN |
1152 | return; |
1153 | ||
b68e6b3b LR |
1154 | last_request->dfs_region = cfg80211_regdomain->dfs_region; |
1155 | ||
b2e1b302 | 1156 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1157 | if (wiphy->bands[band]) |
7ca43d03 | 1158 | handle_band(wiphy, band, initiator); |
b2e1b302 | 1159 | } |
a203c2aa | 1160 | |
e38f8a7a | 1161 | reg_process_beacons(wiphy); |
038659e7 | 1162 | reg_process_ht_flags(wiphy); |
560e28e1 | 1163 | if (wiphy->reg_notifier) |
716f9392 | 1164 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1165 | } |
1166 | ||
eac03e38 SN |
1167 | void regulatory_update(struct wiphy *wiphy, |
1168 | enum nl80211_reg_initiator setby) | |
1169 | { | |
1170 | mutex_lock(®_mutex); | |
1171 | wiphy_update_regulatory(wiphy, setby); | |
1172 | mutex_unlock(®_mutex); | |
1173 | } | |
1174 | ||
d7549cbb SN |
1175 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
1176 | { | |
1177 | struct cfg80211_registered_device *rdev; | |
4a38994f | 1178 | struct wiphy *wiphy; |
d7549cbb | 1179 | |
4a38994f RM |
1180 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { |
1181 | wiphy = &rdev->wiphy; | |
1182 | wiphy_update_regulatory(wiphy, initiator); | |
1183 | /* | |
1184 | * Regulatory updates set by CORE are ignored for custom | |
1185 | * regulatory cards. Let us notify the changes to the driver, | |
1186 | * as some drivers used this to restore its orig_* reg domain. | |
1187 | */ | |
1188 | if (initiator == NL80211_REGDOM_SET_BY_CORE && | |
1189 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY && | |
1190 | wiphy->reg_notifier) | |
1191 | wiphy->reg_notifier(wiphy, last_request); | |
1192 | } | |
d7549cbb SN |
1193 | } |
1194 | ||
1fa25e41 LR |
1195 | static void handle_channel_custom(struct wiphy *wiphy, |
1196 | enum ieee80211_band band, | |
1197 | unsigned int chan_idx, | |
1198 | const struct ieee80211_regdomain *regd) | |
1199 | { | |
1200 | int r; | |
038659e7 LR |
1201 | u32 desired_bw_khz = MHZ_TO_KHZ(20); |
1202 | u32 bw_flags = 0; | |
1fa25e41 LR |
1203 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1204 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 1205 | const struct ieee80211_freq_range *freq_range = NULL; |
1fa25e41 LR |
1206 | struct ieee80211_supported_band *sband; |
1207 | struct ieee80211_channel *chan; | |
1208 | ||
abc7381b | 1209 | assert_reg_lock(); |
ac46d48e | 1210 | |
1fa25e41 LR |
1211 | sband = wiphy->bands[band]; |
1212 | BUG_ON(chan_idx >= sband->n_channels); | |
1213 | chan = &sband->channels[chan_idx]; | |
1214 | ||
038659e7 LR |
1215 | r = freq_reg_info_regd(wiphy, |
1216 | MHZ_TO_KHZ(chan->center_freq), | |
1217 | desired_bw_khz, | |
1218 | ®_rule, | |
1219 | regd); | |
1fa25e41 LR |
1220 | |
1221 | if (r) { | |
d91e41b6 | 1222 | REG_DBG_PRINT("Disabling freq %d MHz as custom " |
a6518536 LR |
1223 | "regd has no rule that fits a %d MHz " |
1224 | "wide channel\n", | |
1225 | chan->center_freq, | |
1226 | KHZ_TO_MHZ(desired_bw_khz)); | |
1fa25e41 LR |
1227 | chan->flags = IEEE80211_CHAN_DISABLED; |
1228 | return; | |
1229 | } | |
1230 | ||
e702d3cf LR |
1231 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
1232 | ||
1fa25e41 | 1233 | power_rule = ®_rule->power_rule; |
038659e7 LR |
1234 | freq_range = ®_rule->freq_range; |
1235 | ||
1236 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1237 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
1fa25e41 | 1238 | |
038659e7 | 1239 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; |
1fa25e41 | 1240 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); |
1fa25e41 LR |
1241 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
1242 | } | |
1243 | ||
1244 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1245 | const struct ieee80211_regdomain *regd) | |
1246 | { | |
1247 | unsigned int i; | |
1248 | struct ieee80211_supported_band *sband; | |
1249 | ||
1250 | BUG_ON(!wiphy->bands[band]); | |
1251 | sband = wiphy->bands[band]; | |
1252 | ||
1253 | for (i = 0; i < sband->n_channels; i++) | |
1254 | handle_channel_custom(wiphy, band, i, regd); | |
1255 | } | |
1256 | ||
1257 | /* Used by drivers prior to wiphy registration */ | |
1258 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1259 | const struct ieee80211_regdomain *regd) | |
1260 | { | |
1261 | enum ieee80211_band band; | |
bbcf3f02 | 1262 | unsigned int bands_set = 0; |
ac46d48e | 1263 | |
abc7381b | 1264 | mutex_lock(®_mutex); |
1fa25e41 | 1265 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
bbcf3f02 LR |
1266 | if (!wiphy->bands[band]) |
1267 | continue; | |
1268 | handle_band_custom(wiphy, band, regd); | |
1269 | bands_set++; | |
b2e1b302 | 1270 | } |
abc7381b | 1271 | mutex_unlock(®_mutex); |
bbcf3f02 LR |
1272 | |
1273 | /* | |
1274 | * no point in calling this if it won't have any effect | |
1275 | * on your device's supportd bands. | |
1276 | */ | |
1277 | WARN_ON(!bands_set); | |
b2e1b302 | 1278 | } |
1fa25e41 LR |
1279 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1280 | ||
fb1fc7ad LR |
1281 | /* |
1282 | * Return value which can be used by ignore_request() to indicate | |
1283 | * it has been determined we should intersect two regulatory domains | |
1284 | */ | |
9c96477d LR |
1285 | #define REG_INTERSECT 1 |
1286 | ||
84fa4f43 JB |
1287 | /* This has the logic which determines when a new request |
1288 | * should be ignored. */ | |
2f92cd2e LR |
1289 | static int ignore_request(struct wiphy *wiphy, |
1290 | struct regulatory_request *pending_request) | |
84fa4f43 | 1291 | { |
806a9e39 | 1292 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1293 | |
1294 | assert_cfg80211_lock(); | |
1295 | ||
84fa4f43 JB |
1296 | /* All initial requests are respected */ |
1297 | if (!last_request) | |
1298 | return 0; | |
1299 | ||
2f92cd2e | 1300 | switch (pending_request->initiator) { |
7db90f4a | 1301 | case NL80211_REGDOM_SET_BY_CORE: |
09d989d1 | 1302 | return 0; |
7db90f4a | 1303 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1304 | |
1305 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1306 | ||
2f92cd2e | 1307 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1308 | return -EINVAL; |
7db90f4a LR |
1309 | if (last_request->initiator == |
1310 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1311 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1312 | /* |
1313 | * Two cards with two APs claiming different | |
1fe90b03 | 1314 | * Country IE alpha2s. We could |
84fa4f43 JB |
1315 | * intersect them, but that seems unlikely |
1316 | * to be correct. Reject second one for now. | |
1317 | */ | |
2f92cd2e | 1318 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1319 | return -EOPNOTSUPP; |
1320 | return -EALREADY; | |
1321 | } | |
fb1fc7ad LR |
1322 | /* |
1323 | * Two consecutive Country IE hints on the same wiphy. | |
1324 | * This should be picked up early by the driver/stack | |
1325 | */ | |
2f92cd2e | 1326 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1327 | return 0; |
1328 | return -EALREADY; | |
1329 | } | |
a171fba4 | 1330 | return 0; |
7db90f4a LR |
1331 | case NL80211_REGDOM_SET_BY_DRIVER: |
1332 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
2f92cd2e | 1333 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1334 | return 0; |
84fa4f43 | 1335 | return -EALREADY; |
e74b1e7f | 1336 | } |
fff32c04 LR |
1337 | |
1338 | /* | |
1339 | * This would happen if you unplug and plug your card | |
1340 | * back in or if you add a new device for which the previously | |
1341 | * loaded card also agrees on the regulatory domain. | |
1342 | */ | |
7db90f4a | 1343 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1344 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1345 | return -EALREADY; |
1346 | ||
3e0c3ff3 | 1347 | return REG_INTERSECT; |
7db90f4a LR |
1348 | case NL80211_REGDOM_SET_BY_USER: |
1349 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1350 | return REG_INTERSECT; |
fb1fc7ad LR |
1351 | /* |
1352 | * If the user knows better the user should set the regdom | |
1353 | * to their country before the IE is picked up | |
1354 | */ | |
7db90f4a | 1355 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1356 | last_request->intersect) |
1357 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1358 | /* |
1359 | * Process user requests only after previous user/driver/core | |
1360 | * requests have been processed | |
1361 | */ | |
7db90f4a LR |
1362 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1363 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1364 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
69b1572b | 1365 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1366 | return -EAGAIN; |
1367 | } | |
1368 | ||
baeb66fe | 1369 | if (!regdom_changes(pending_request->alpha2)) |
e74b1e7f LR |
1370 | return -EALREADY; |
1371 | ||
84fa4f43 JB |
1372 | return 0; |
1373 | } | |
1374 | ||
1375 | return -EINVAL; | |
1376 | } | |
1377 | ||
b2e253cf LR |
1378 | static void reg_set_request_processed(void) |
1379 | { | |
1380 | bool need_more_processing = false; | |
1381 | ||
1382 | last_request->processed = true; | |
1383 | ||
1384 | spin_lock(®_requests_lock); | |
1385 | if (!list_empty(®_requests_list)) | |
1386 | need_more_processing = true; | |
1387 | spin_unlock(®_requests_lock); | |
1388 | ||
a90c7a31 LR |
1389 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) |
1390 | cancel_delayed_work_sync(®_timeout); | |
1391 | ||
b2e253cf LR |
1392 | if (need_more_processing) |
1393 | schedule_work(®_work); | |
1394 | } | |
1395 | ||
d1c96a9a LR |
1396 | /** |
1397 | * __regulatory_hint - hint to the wireless core a regulatory domain | |
1398 | * @wiphy: if the hint comes from country information from an AP, this | |
1399 | * is required to be set to the wiphy that received the information | |
28da32d7 | 1400 | * @pending_request: the regulatory request currently being processed |
d1c96a9a LR |
1401 | * |
1402 | * The Wireless subsystem can use this function to hint to the wireless core | |
28da32d7 | 1403 | * what it believes should be the current regulatory domain. |
d1c96a9a LR |
1404 | * |
1405 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1406 | * already been set or other standard error codes. | |
1407 | * | |
abc7381b | 1408 | * Caller must hold &cfg80211_mutex and ®_mutex |
d1c96a9a | 1409 | */ |
28da32d7 LR |
1410 | static int __regulatory_hint(struct wiphy *wiphy, |
1411 | struct regulatory_request *pending_request) | |
b2e1b302 | 1412 | { |
9c96477d | 1413 | bool intersect = false; |
b2e1b302 LR |
1414 | int r = 0; |
1415 | ||
761cf7ec LR |
1416 | assert_cfg80211_lock(); |
1417 | ||
2f92cd2e | 1418 | r = ignore_request(wiphy, pending_request); |
9c96477d | 1419 | |
3e0c3ff3 | 1420 | if (r == REG_INTERSECT) { |
7db90f4a LR |
1421 | if (pending_request->initiator == |
1422 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1423 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1424 | if (r) { |
1425 | kfree(pending_request); | |
3e0c3ff3 | 1426 | return r; |
d951c1dd | 1427 | } |
3e0c3ff3 | 1428 | } |
9c96477d | 1429 | intersect = true; |
3e0c3ff3 | 1430 | } else if (r) { |
fb1fc7ad LR |
1431 | /* |
1432 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1433 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1434 | * wiphy |
1435 | */ | |
28da32d7 | 1436 | if (r == -EALREADY && |
7db90f4a LR |
1437 | pending_request->initiator == |
1438 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1439 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1440 | if (r) { |
1441 | kfree(pending_request); | |
3e0c3ff3 | 1442 | return r; |
d951c1dd | 1443 | } |
3e0c3ff3 LR |
1444 | r = -EALREADY; |
1445 | goto new_request; | |
1446 | } | |
d951c1dd | 1447 | kfree(pending_request); |
b2e1b302 | 1448 | return r; |
3e0c3ff3 | 1449 | } |
b2e1b302 | 1450 | |
3e0c3ff3 | 1451 | new_request: |
a042994d LR |
1452 | if (last_request != &core_request_world) |
1453 | kfree(last_request); | |
5203cdb6 | 1454 | |
d951c1dd LR |
1455 | last_request = pending_request; |
1456 | last_request->intersect = intersect; | |
5203cdb6 | 1457 | |
d951c1dd | 1458 | pending_request = NULL; |
3e0c3ff3 | 1459 | |
09d989d1 LR |
1460 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) { |
1461 | user_alpha2[0] = last_request->alpha2[0]; | |
1462 | user_alpha2[1] = last_request->alpha2[1]; | |
1463 | } | |
1464 | ||
3e0c3ff3 | 1465 | /* When r == REG_INTERSECT we do need to call CRDA */ |
73d54c9e LR |
1466 | if (r < 0) { |
1467 | /* | |
1468 | * Since CRDA will not be called in this case as we already | |
1469 | * have applied the requested regulatory domain before we just | |
1470 | * inform userspace we have processed the request | |
1471 | */ | |
b2e253cf | 1472 | if (r == -EALREADY) { |
73d54c9e | 1473 | nl80211_send_reg_change_event(last_request); |
b2e253cf LR |
1474 | reg_set_request_processed(); |
1475 | } | |
3e0c3ff3 | 1476 | return r; |
73d54c9e | 1477 | } |
3e0c3ff3 | 1478 | |
d951c1dd | 1479 | return call_crda(last_request->alpha2); |
b2e1b302 LR |
1480 | } |
1481 | ||
30a548c7 | 1482 | /* This processes *all* regulatory hints */ |
d951c1dd | 1483 | static void reg_process_hint(struct regulatory_request *reg_request) |
fe33eb39 LR |
1484 | { |
1485 | int r = 0; | |
1486 | struct wiphy *wiphy = NULL; | |
c4c32294 | 1487 | enum nl80211_reg_initiator initiator = reg_request->initiator; |
fe33eb39 LR |
1488 | |
1489 | BUG_ON(!reg_request->alpha2); | |
1490 | ||
fe33eb39 LR |
1491 | if (wiphy_idx_valid(reg_request->wiphy_idx)) |
1492 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1493 | ||
7db90f4a | 1494 | if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
fe33eb39 | 1495 | !wiphy) { |
d951c1dd | 1496 | kfree(reg_request); |
b0e2880b | 1497 | return; |
fe33eb39 LR |
1498 | } |
1499 | ||
28da32d7 | 1500 | r = __regulatory_hint(wiphy, reg_request); |
fe33eb39 | 1501 | /* This is required so that the orig_* parameters are saved */ |
5be83de5 | 1502 | if (r == -EALREADY && wiphy && |
a90c7a31 | 1503 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
c4c32294 | 1504 | wiphy_update_regulatory(wiphy, initiator); |
a90c7a31 LR |
1505 | return; |
1506 | } | |
1507 | ||
1508 | /* | |
1509 | * We only time out user hints, given that they should be the only | |
1510 | * source of bogus requests. | |
1511 | */ | |
c989bb15 LR |
1512 | if (r != -EALREADY && |
1513 | reg_request->initiator == NL80211_REGDOM_SET_BY_USER) | |
a90c7a31 | 1514 | schedule_delayed_work(®_timeout, msecs_to_jiffies(3142)); |
fe33eb39 LR |
1515 | } |
1516 | ||
b2e253cf LR |
1517 | /* |
1518 | * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* | |
1519 | * Regulatory hints come on a first come first serve basis and we | |
1520 | * must process each one atomically. | |
1521 | */ | |
fe33eb39 | 1522 | static void reg_process_pending_hints(void) |
b0e2880b | 1523 | { |
fe33eb39 | 1524 | struct regulatory_request *reg_request; |
fe33eb39 | 1525 | |
b0e2880b LR |
1526 | mutex_lock(&cfg80211_mutex); |
1527 | mutex_lock(®_mutex); | |
1528 | ||
b2e253cf LR |
1529 | /* When last_request->processed becomes true this will be rescheduled */ |
1530 | if (last_request && !last_request->processed) { | |
1531 | REG_DBG_PRINT("Pending regulatory request, waiting " | |
12c5ffb5 | 1532 | "for it to be processed...\n"); |
b2e253cf LR |
1533 | goto out; |
1534 | } | |
1535 | ||
fe33eb39 | 1536 | spin_lock(®_requests_lock); |
fe33eb39 | 1537 | |
b2e253cf | 1538 | if (list_empty(®_requests_list)) { |
d951c1dd | 1539 | spin_unlock(®_requests_lock); |
b2e253cf | 1540 | goto out; |
fe33eb39 | 1541 | } |
b2e253cf LR |
1542 | |
1543 | reg_request = list_first_entry(®_requests_list, | |
1544 | struct regulatory_request, | |
1545 | list); | |
1546 | list_del_init(®_request->list); | |
1547 | ||
fe33eb39 | 1548 | spin_unlock(®_requests_lock); |
b0e2880b | 1549 | |
b2e253cf LR |
1550 | reg_process_hint(reg_request); |
1551 | ||
1552 | out: | |
b0e2880b LR |
1553 | mutex_unlock(®_mutex); |
1554 | mutex_unlock(&cfg80211_mutex); | |
fe33eb39 LR |
1555 | } |
1556 | ||
e38f8a7a LR |
1557 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1558 | static void reg_process_pending_beacon_hints(void) | |
1559 | { | |
79c97e97 | 1560 | struct cfg80211_registered_device *rdev; |
e38f8a7a LR |
1561 | struct reg_beacon *pending_beacon, *tmp; |
1562 | ||
abc7381b LR |
1563 | /* |
1564 | * No need to hold the reg_mutex here as we just touch wiphys | |
1565 | * and do not read or access regulatory variables. | |
1566 | */ | |
e38f8a7a LR |
1567 | mutex_lock(&cfg80211_mutex); |
1568 | ||
1569 | /* This goes through the _pending_ beacon list */ | |
1570 | spin_lock_bh(®_pending_beacons_lock); | |
1571 | ||
1572 | if (list_empty(®_pending_beacons)) { | |
1573 | spin_unlock_bh(®_pending_beacons_lock); | |
1574 | goto out; | |
1575 | } | |
1576 | ||
1577 | list_for_each_entry_safe(pending_beacon, tmp, | |
1578 | ®_pending_beacons, list) { | |
1579 | ||
1580 | list_del_init(&pending_beacon->list); | |
1581 | ||
1582 | /* Applies the beacon hint to current wiphys */ | |
79c97e97 JB |
1583 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1584 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); | |
e38f8a7a LR |
1585 | |
1586 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
1587 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
1588 | } | |
1589 | ||
1590 | spin_unlock_bh(®_pending_beacons_lock); | |
1591 | out: | |
1592 | mutex_unlock(&cfg80211_mutex); | |
1593 | } | |
1594 | ||
fe33eb39 LR |
1595 | static void reg_todo(struct work_struct *work) |
1596 | { | |
1597 | reg_process_pending_hints(); | |
e38f8a7a | 1598 | reg_process_pending_beacon_hints(); |
fe33eb39 LR |
1599 | } |
1600 | ||
fe33eb39 LR |
1601 | static void queue_regulatory_request(struct regulatory_request *request) |
1602 | { | |
c61029c7 JL |
1603 | if (isalpha(request->alpha2[0])) |
1604 | request->alpha2[0] = toupper(request->alpha2[0]); | |
1605 | if (isalpha(request->alpha2[1])) | |
1606 | request->alpha2[1] = toupper(request->alpha2[1]); | |
1607 | ||
fe33eb39 LR |
1608 | spin_lock(®_requests_lock); |
1609 | list_add_tail(&request->list, ®_requests_list); | |
1610 | spin_unlock(®_requests_lock); | |
1611 | ||
1612 | schedule_work(®_work); | |
1613 | } | |
1614 | ||
09d989d1 LR |
1615 | /* |
1616 | * Core regulatory hint -- happens during cfg80211_init() | |
1617 | * and when we restore regulatory settings. | |
1618 | */ | |
ba25c141 LR |
1619 | static int regulatory_hint_core(const char *alpha2) |
1620 | { | |
1621 | struct regulatory_request *request; | |
1622 | ||
ba25c141 LR |
1623 | request = kzalloc(sizeof(struct regulatory_request), |
1624 | GFP_KERNEL); | |
1625 | if (!request) | |
1626 | return -ENOMEM; | |
1627 | ||
1628 | request->alpha2[0] = alpha2[0]; | |
1629 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1630 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
ba25c141 | 1631 | |
31e99729 | 1632 | queue_regulatory_request(request); |
5078b2e3 | 1633 | |
fe33eb39 | 1634 | return 0; |
ba25c141 LR |
1635 | } |
1636 | ||
fe33eb39 LR |
1637 | /* User hints */ |
1638 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1639 | { |
fe33eb39 LR |
1640 | struct regulatory_request *request; |
1641 | ||
be3d4810 | 1642 | BUG_ON(!alpha2); |
b2e1b302 | 1643 | |
fe33eb39 LR |
1644 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1645 | if (!request) | |
1646 | return -ENOMEM; | |
1647 | ||
1648 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1649 | request->alpha2[0] = alpha2[0]; | |
1650 | request->alpha2[1] = alpha2[1]; | |
e12822e1 | 1651 | request->initiator = NL80211_REGDOM_SET_BY_USER; |
fe33eb39 LR |
1652 | |
1653 | queue_regulatory_request(request); | |
1654 | ||
1655 | return 0; | |
1656 | } | |
1657 | ||
1658 | /* Driver hints */ | |
1659 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1660 | { | |
1661 | struct regulatory_request *request; | |
1662 | ||
1663 | BUG_ON(!alpha2); | |
1664 | BUG_ON(!wiphy); | |
1665 | ||
1666 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1667 | if (!request) | |
1668 | return -ENOMEM; | |
1669 | ||
1670 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1671 | ||
1672 | /* Must have registered wiphy first */ | |
1673 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1674 | ||
1675 | request->alpha2[0] = alpha2[0]; | |
1676 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1677 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
fe33eb39 LR |
1678 | |
1679 | queue_regulatory_request(request); | |
1680 | ||
1681 | return 0; | |
b2e1b302 LR |
1682 | } |
1683 | EXPORT_SYMBOL(regulatory_hint); | |
1684 | ||
4b44c8bc LR |
1685 | /* |
1686 | * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and | |
1687 | * therefore cannot iterate over the rdev list here. | |
1688 | */ | |
3f2355cb | 1689 | void regulatory_hint_11d(struct wiphy *wiphy, |
84920e3e LR |
1690 | enum ieee80211_band band, |
1691 | u8 *country_ie, | |
1692 | u8 country_ie_len) | |
3f2355cb | 1693 | { |
3f2355cb | 1694 | char alpha2[2]; |
3f2355cb | 1695 | enum environment_cap env = ENVIRON_ANY; |
fe33eb39 | 1696 | struct regulatory_request *request; |
3f2355cb | 1697 | |
abc7381b | 1698 | mutex_lock(®_mutex); |
3f2355cb | 1699 | |
9828b017 LR |
1700 | if (unlikely(!last_request)) |
1701 | goto out; | |
d335fe63 | 1702 | |
3f2355cb LR |
1703 | /* IE len must be evenly divisible by 2 */ |
1704 | if (country_ie_len & 0x01) | |
1705 | goto out; | |
1706 | ||
1707 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1708 | goto out; | |
1709 | ||
3f2355cb LR |
1710 | alpha2[0] = country_ie[0]; |
1711 | alpha2[1] = country_ie[1]; | |
1712 | ||
1713 | if (country_ie[2] == 'I') | |
1714 | env = ENVIRON_INDOOR; | |
1715 | else if (country_ie[2] == 'O') | |
1716 | env = ENVIRON_OUTDOOR; | |
1717 | ||
fb1fc7ad | 1718 | /* |
8b19e6ca | 1719 | * We will run this only upon a successful connection on cfg80211. |
4b44c8bc LR |
1720 | * We leave conflict resolution to the workqueue, where can hold |
1721 | * cfg80211_mutex. | |
fb1fc7ad | 1722 | */ |
cc0b6fe8 LR |
1723 | if (likely(last_request->initiator == |
1724 | NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
4b44c8bc LR |
1725 | wiphy_idx_valid(last_request->wiphy_idx))) |
1726 | goto out; | |
3f2355cb | 1727 | |
fe33eb39 LR |
1728 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1729 | if (!request) | |
f9f9b6e3 | 1730 | goto out; |
fe33eb39 | 1731 | |
fe33eb39 | 1732 | request->wiphy_idx = get_wiphy_idx(wiphy); |
4f366c5d JL |
1733 | request->alpha2[0] = alpha2[0]; |
1734 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1735 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
fe33eb39 LR |
1736 | request->country_ie_env = env; |
1737 | ||
abc7381b | 1738 | mutex_unlock(®_mutex); |
3f2355cb | 1739 | |
fe33eb39 LR |
1740 | queue_regulatory_request(request); |
1741 | ||
1742 | return; | |
0441d6ff | 1743 | |
3f2355cb | 1744 | out: |
abc7381b | 1745 | mutex_unlock(®_mutex); |
3f2355cb | 1746 | } |
b2e1b302 | 1747 | |
09d989d1 LR |
1748 | static void restore_alpha2(char *alpha2, bool reset_user) |
1749 | { | |
1750 | /* indicates there is no alpha2 to consider for restoration */ | |
1751 | alpha2[0] = '9'; | |
1752 | alpha2[1] = '7'; | |
1753 | ||
1754 | /* The user setting has precedence over the module parameter */ | |
1755 | if (is_user_regdom_saved()) { | |
1756 | /* Unless we're asked to ignore it and reset it */ | |
1757 | if (reset_user) { | |
d91e41b6 | 1758 | REG_DBG_PRINT("Restoring regulatory settings " |
09d989d1 LR |
1759 | "including user preference\n"); |
1760 | user_alpha2[0] = '9'; | |
1761 | user_alpha2[1] = '7'; | |
1762 | ||
1763 | /* | |
1764 | * If we're ignoring user settings, we still need to | |
1765 | * check the module parameter to ensure we put things | |
1766 | * back as they were for a full restore. | |
1767 | */ | |
1768 | if (!is_world_regdom(ieee80211_regdom)) { | |
d91e41b6 | 1769 | REG_DBG_PRINT("Keeping preference on " |
09d989d1 LR |
1770 | "module parameter ieee80211_regdom: %c%c\n", |
1771 | ieee80211_regdom[0], | |
1772 | ieee80211_regdom[1]); | |
1773 | alpha2[0] = ieee80211_regdom[0]; | |
1774 | alpha2[1] = ieee80211_regdom[1]; | |
1775 | } | |
1776 | } else { | |
d91e41b6 | 1777 | REG_DBG_PRINT("Restoring regulatory settings " |
09d989d1 LR |
1778 | "while preserving user preference for: %c%c\n", |
1779 | user_alpha2[0], | |
1780 | user_alpha2[1]); | |
1781 | alpha2[0] = user_alpha2[0]; | |
1782 | alpha2[1] = user_alpha2[1]; | |
1783 | } | |
1784 | } else if (!is_world_regdom(ieee80211_regdom)) { | |
d91e41b6 | 1785 | REG_DBG_PRINT("Keeping preference on " |
09d989d1 LR |
1786 | "module parameter ieee80211_regdom: %c%c\n", |
1787 | ieee80211_regdom[0], | |
1788 | ieee80211_regdom[1]); | |
1789 | alpha2[0] = ieee80211_regdom[0]; | |
1790 | alpha2[1] = ieee80211_regdom[1]; | |
1791 | } else | |
d91e41b6 | 1792 | REG_DBG_PRINT("Restoring regulatory settings\n"); |
09d989d1 LR |
1793 | } |
1794 | ||
5ce543d1 RM |
1795 | static void restore_custom_reg_settings(struct wiphy *wiphy) |
1796 | { | |
1797 | struct ieee80211_supported_band *sband; | |
1798 | enum ieee80211_band band; | |
1799 | struct ieee80211_channel *chan; | |
1800 | int i; | |
1801 | ||
1802 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1803 | sband = wiphy->bands[band]; | |
1804 | if (!sband) | |
1805 | continue; | |
1806 | for (i = 0; i < sband->n_channels; i++) { | |
1807 | chan = &sband->channels[i]; | |
1808 | chan->flags = chan->orig_flags; | |
1809 | chan->max_antenna_gain = chan->orig_mag; | |
1810 | chan->max_power = chan->orig_mpwr; | |
1811 | } | |
1812 | } | |
1813 | } | |
1814 | ||
09d989d1 LR |
1815 | /* |
1816 | * Restoring regulatory settings involves ingoring any | |
1817 | * possibly stale country IE information and user regulatory | |
1818 | * settings if so desired, this includes any beacon hints | |
1819 | * learned as we could have traveled outside to another country | |
1820 | * after disconnection. To restore regulatory settings we do | |
1821 | * exactly what we did at bootup: | |
1822 | * | |
1823 | * - send a core regulatory hint | |
1824 | * - send a user regulatory hint if applicable | |
1825 | * | |
1826 | * Device drivers that send a regulatory hint for a specific country | |
1827 | * keep their own regulatory domain on wiphy->regd so that does does | |
1828 | * not need to be remembered. | |
1829 | */ | |
1830 | static void restore_regulatory_settings(bool reset_user) | |
1831 | { | |
1832 | char alpha2[2]; | |
cee0bec5 | 1833 | char world_alpha2[2]; |
09d989d1 | 1834 | struct reg_beacon *reg_beacon, *btmp; |
14609555 LR |
1835 | struct regulatory_request *reg_request, *tmp; |
1836 | LIST_HEAD(tmp_reg_req_list); | |
5ce543d1 | 1837 | struct cfg80211_registered_device *rdev; |
09d989d1 LR |
1838 | |
1839 | mutex_lock(&cfg80211_mutex); | |
1840 | mutex_lock(®_mutex); | |
1841 | ||
a042994d | 1842 | reset_regdomains(true); |
09d989d1 LR |
1843 | restore_alpha2(alpha2, reset_user); |
1844 | ||
14609555 LR |
1845 | /* |
1846 | * If there's any pending requests we simply | |
1847 | * stash them to a temporary pending queue and | |
1848 | * add then after we've restored regulatory | |
1849 | * settings. | |
1850 | */ | |
1851 | spin_lock(®_requests_lock); | |
1852 | if (!list_empty(®_requests_list)) { | |
1853 | list_for_each_entry_safe(reg_request, tmp, | |
1854 | ®_requests_list, list) { | |
1855 | if (reg_request->initiator != | |
1856 | NL80211_REGDOM_SET_BY_USER) | |
1857 | continue; | |
1858 | list_del(®_request->list); | |
1859 | list_add_tail(®_request->list, &tmp_reg_req_list); | |
1860 | } | |
1861 | } | |
1862 | spin_unlock(®_requests_lock); | |
1863 | ||
09d989d1 LR |
1864 | /* Clear beacon hints */ |
1865 | spin_lock_bh(®_pending_beacons_lock); | |
1866 | if (!list_empty(®_pending_beacons)) { | |
1867 | list_for_each_entry_safe(reg_beacon, btmp, | |
1868 | ®_pending_beacons, list) { | |
1869 | list_del(®_beacon->list); | |
1870 | kfree(reg_beacon); | |
1871 | } | |
1872 | } | |
1873 | spin_unlock_bh(®_pending_beacons_lock); | |
1874 | ||
1875 | if (!list_empty(®_beacon_list)) { | |
1876 | list_for_each_entry_safe(reg_beacon, btmp, | |
1877 | ®_beacon_list, list) { | |
1878 | list_del(®_beacon->list); | |
1879 | kfree(reg_beacon); | |
1880 | } | |
1881 | } | |
1882 | ||
1883 | /* First restore to the basic regulatory settings */ | |
1884 | cfg80211_regdomain = cfg80211_world_regdom; | |
cee0bec5 DS |
1885 | world_alpha2[0] = cfg80211_regdomain->alpha2[0]; |
1886 | world_alpha2[1] = cfg80211_regdomain->alpha2[1]; | |
09d989d1 | 1887 | |
5ce543d1 RM |
1888 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { |
1889 | if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY) | |
1890 | restore_custom_reg_settings(&rdev->wiphy); | |
1891 | } | |
1892 | ||
09d989d1 LR |
1893 | mutex_unlock(®_mutex); |
1894 | mutex_unlock(&cfg80211_mutex); | |
1895 | ||
cee0bec5 | 1896 | regulatory_hint_core(world_alpha2); |
09d989d1 LR |
1897 | |
1898 | /* | |
1899 | * This restores the ieee80211_regdom module parameter | |
1900 | * preference or the last user requested regulatory | |
1901 | * settings, user regulatory settings takes precedence. | |
1902 | */ | |
1903 | if (is_an_alpha2(alpha2)) | |
1904 | regulatory_hint_user(user_alpha2); | |
09d989d1 | 1905 | |
14609555 LR |
1906 | if (list_empty(&tmp_reg_req_list)) |
1907 | return; | |
1908 | ||
1909 | mutex_lock(&cfg80211_mutex); | |
1910 | mutex_lock(®_mutex); | |
1911 | ||
1912 | spin_lock(®_requests_lock); | |
1913 | list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) { | |
1914 | REG_DBG_PRINT("Adding request for country %c%c back " | |
1915 | "into the queue\n", | |
1916 | reg_request->alpha2[0], | |
1917 | reg_request->alpha2[1]); | |
1918 | list_del(®_request->list); | |
1919 | list_add_tail(®_request->list, ®_requests_list); | |
1920 | } | |
1921 | spin_unlock(®_requests_lock); | |
1922 | ||
1923 | mutex_unlock(®_mutex); | |
1924 | mutex_unlock(&cfg80211_mutex); | |
1925 | ||
1926 | REG_DBG_PRINT("Kicking the queue\n"); | |
1927 | ||
1928 | schedule_work(®_work); | |
1929 | } | |
09d989d1 LR |
1930 | |
1931 | void regulatory_hint_disconnect(void) | |
1932 | { | |
d91e41b6 | 1933 | REG_DBG_PRINT("All devices are disconnected, going to " |
09d989d1 LR |
1934 | "restore regulatory settings\n"); |
1935 | restore_regulatory_settings(false); | |
1936 | } | |
1937 | ||
e38f8a7a LR |
1938 | static bool freq_is_chan_12_13_14(u16 freq) |
1939 | { | |
59eb21a6 BR |
1940 | if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) || |
1941 | freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) || | |
1942 | freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ)) | |
e38f8a7a LR |
1943 | return true; |
1944 | return false; | |
1945 | } | |
1946 | ||
1947 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
1948 | struct ieee80211_channel *beacon_chan, | |
1949 | gfp_t gfp) | |
1950 | { | |
1951 | struct reg_beacon *reg_beacon; | |
1952 | ||
1953 | if (likely((beacon_chan->beacon_found || | |
1954 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || | |
1955 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
1956 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) | |
1957 | return 0; | |
1958 | ||
1959 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
1960 | if (!reg_beacon) | |
1961 | return -ENOMEM; | |
1962 | ||
d91e41b6 | 1963 | REG_DBG_PRINT("Found new beacon on " |
4113f751 LR |
1964 | "frequency: %d MHz (Ch %d) on %s\n", |
1965 | beacon_chan->center_freq, | |
1966 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
1967 | wiphy_name(wiphy)); | |
1968 | ||
e38f8a7a LR |
1969 | memcpy(®_beacon->chan, beacon_chan, |
1970 | sizeof(struct ieee80211_channel)); | |
1971 | ||
1972 | ||
1973 | /* | |
1974 | * Since we can be called from BH or and non-BH context | |
1975 | * we must use spin_lock_bh() | |
1976 | */ | |
1977 | spin_lock_bh(®_pending_beacons_lock); | |
1978 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
1979 | spin_unlock_bh(®_pending_beacons_lock); | |
1980 | ||
1981 | schedule_work(®_work); | |
1982 | ||
1983 | return 0; | |
1984 | } | |
1985 | ||
a3d2eaf0 | 1986 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1987 | { |
1988 | unsigned int i; | |
a3d2eaf0 JB |
1989 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1990 | const struct ieee80211_freq_range *freq_range = NULL; | |
1991 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 | 1992 | |
e9c0268f | 1993 | pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n"); |
b2e1b302 LR |
1994 | |
1995 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1996 | reg_rule = &rd->reg_rules[i]; | |
1997 | freq_range = ®_rule->freq_range; | |
1998 | power_rule = ®_rule->power_rule; | |
1999 | ||
fb1fc7ad LR |
2000 | /* |
2001 | * There may not be documentation for max antenna gain | |
2002 | * in certain regions | |
2003 | */ | |
b2e1b302 | 2004 | if (power_rule->max_antenna_gain) |
e9c0268f | 2005 | pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n", |
b2e1b302 LR |
2006 | freq_range->start_freq_khz, |
2007 | freq_range->end_freq_khz, | |
2008 | freq_range->max_bandwidth_khz, | |
2009 | power_rule->max_antenna_gain, | |
2010 | power_rule->max_eirp); | |
2011 | else | |
e9c0268f | 2012 | pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n", |
b2e1b302 LR |
2013 | freq_range->start_freq_khz, |
2014 | freq_range->end_freq_khz, | |
2015 | freq_range->max_bandwidth_khz, | |
2016 | power_rule->max_eirp); | |
2017 | } | |
2018 | } | |
2019 | ||
8b60b078 LR |
2020 | bool reg_supported_dfs_region(u8 dfs_region) |
2021 | { | |
2022 | switch (dfs_region) { | |
2023 | case NL80211_DFS_UNSET: | |
2024 | case NL80211_DFS_FCC: | |
2025 | case NL80211_DFS_ETSI: | |
2026 | case NL80211_DFS_JP: | |
2027 | return true; | |
2028 | default: | |
2029 | REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n", | |
2030 | dfs_region); | |
2031 | return false; | |
2032 | } | |
2033 | } | |
2034 | ||
2035 | static void print_dfs_region(u8 dfs_region) | |
2036 | { | |
2037 | if (!dfs_region) | |
2038 | return; | |
2039 | ||
2040 | switch (dfs_region) { | |
2041 | case NL80211_DFS_FCC: | |
2042 | pr_info(" DFS Master region FCC"); | |
2043 | break; | |
2044 | case NL80211_DFS_ETSI: | |
2045 | pr_info(" DFS Master region ETSI"); | |
2046 | break; | |
2047 | case NL80211_DFS_JP: | |
2048 | pr_info(" DFS Master region JP"); | |
2049 | break; | |
2050 | default: | |
2051 | pr_info(" DFS Master region Uknown"); | |
2052 | break; | |
2053 | } | |
2054 | } | |
2055 | ||
a3d2eaf0 | 2056 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
2057 | { |
2058 | ||
3f2355cb | 2059 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 2060 | |
7db90f4a LR |
2061 | if (last_request->initiator == |
2062 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
79c97e97 JB |
2063 | struct cfg80211_registered_device *rdev; |
2064 | rdev = cfg80211_rdev_by_wiphy_idx( | |
806a9e39 | 2065 | last_request->wiphy_idx); |
79c97e97 | 2066 | if (rdev) { |
e9c0268f | 2067 | pr_info("Current regulatory domain updated by AP to: %c%c\n", |
79c97e97 JB |
2068 | rdev->country_ie_alpha2[0], |
2069 | rdev->country_ie_alpha2[1]); | |
3f2355cb | 2070 | } else |
e9c0268f | 2071 | pr_info("Current regulatory domain intersected:\n"); |
3f2355cb | 2072 | } else |
e9c0268f | 2073 | pr_info("Current regulatory domain intersected:\n"); |
3f2355cb | 2074 | } else if (is_world_regdom(rd->alpha2)) |
e9c0268f | 2075 | pr_info("World regulatory domain updated:\n"); |
b2e1b302 LR |
2076 | else { |
2077 | if (is_unknown_alpha2(rd->alpha2)) | |
e9c0268f | 2078 | pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n"); |
b2e1b302 | 2079 | else |
e9c0268f | 2080 | pr_info("Regulatory domain changed to country: %c%c\n", |
b2e1b302 LR |
2081 | rd->alpha2[0], rd->alpha2[1]); |
2082 | } | |
8b60b078 | 2083 | print_dfs_region(rd->dfs_region); |
b2e1b302 LR |
2084 | print_rd_rules(rd); |
2085 | } | |
2086 | ||
2df78167 | 2087 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2088 | { |
e9c0268f | 2089 | pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]); |
b2e1b302 LR |
2090 | print_rd_rules(rd); |
2091 | } | |
2092 | ||
d2372b31 | 2093 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 2094 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2095 | { |
9c96477d | 2096 | const struct ieee80211_regdomain *intersected_rd = NULL; |
79c97e97 | 2097 | struct cfg80211_registered_device *rdev = NULL; |
806a9e39 | 2098 | struct wiphy *request_wiphy; |
b2e1b302 LR |
2099 | /* Some basic sanity checks first */ |
2100 | ||
b2e1b302 | 2101 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 2102 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2103 | return -EINVAL; |
2104 | update_world_regdomain(rd); | |
2105 | return 0; | |
2106 | } | |
b2e1b302 LR |
2107 | |
2108 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
2109 | !is_unknown_alpha2(rd->alpha2)) | |
2110 | return -EINVAL; | |
2111 | ||
f6037d09 | 2112 | if (!last_request) |
b2e1b302 LR |
2113 | return -EINVAL; |
2114 | ||
fb1fc7ad LR |
2115 | /* |
2116 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 2117 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
2118 | * and the pending request came in from a country IE |
2119 | */ | |
7db90f4a | 2120 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
2121 | /* |
2122 | * If someone else asked us to change the rd lets only bother | |
2123 | * checking if the alpha2 changes if CRDA was already called | |
2124 | */ | |
baeb66fe | 2125 | if (!regdom_changes(rd->alpha2)) |
3f2355cb LR |
2126 | return -EINVAL; |
2127 | } | |
2128 | ||
fb1fc7ad LR |
2129 | /* |
2130 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
2131 | * and finally inform them of what we have done, in case they want |
2132 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
2133 | * internal EEPROM data |
2134 | */ | |
b2e1b302 | 2135 | |
f6037d09 | 2136 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2137 | return -EINVAL; |
2138 | ||
8375af3b | 2139 | if (!is_valid_rd(rd)) { |
e9c0268f | 2140 | pr_err("Invalid regulatory domain detected:\n"); |
8375af3b LR |
2141 | print_regdomain_info(rd); |
2142 | return -EINVAL; | |
b2e1b302 LR |
2143 | } |
2144 | ||
806a9e39 | 2145 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
0bac71af LR |
2146 | if (!request_wiphy && |
2147 | (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
2148 | last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) { | |
2149 | schedule_delayed_work(®_timeout, 0); | |
de3584bd JB |
2150 | return -ENODEV; |
2151 | } | |
806a9e39 | 2152 | |
b8295acd | 2153 | if (!last_request->intersect) { |
3e0c3ff3 LR |
2154 | int r; |
2155 | ||
7db90f4a | 2156 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
a042994d | 2157 | reset_regdomains(false); |
3e0c3ff3 LR |
2158 | cfg80211_regdomain = rd; |
2159 | return 0; | |
2160 | } | |
2161 | ||
fb1fc7ad LR |
2162 | /* |
2163 | * For a driver hint, lets copy the regulatory domain the | |
2164 | * driver wanted to the wiphy to deal with conflicts | |
2165 | */ | |
3e0c3ff3 | 2166 | |
558f6d32 LR |
2167 | /* |
2168 | * Userspace could have sent two replies with only | |
2169 | * one kernel request. | |
2170 | */ | |
2171 | if (request_wiphy->regd) | |
2172 | return -EALREADY; | |
3e0c3ff3 | 2173 | |
806a9e39 | 2174 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
2175 | if (r) |
2176 | return r; | |
2177 | ||
a042994d | 2178 | reset_regdomains(false); |
b8295acd LR |
2179 | cfg80211_regdomain = rd; |
2180 | return 0; | |
2181 | } | |
2182 | ||
2183 | /* Intersection requires a bit more work */ | |
2184 | ||
7db90f4a | 2185 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 2186 | |
9c96477d LR |
2187 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
2188 | if (!intersected_rd) | |
2189 | return -EINVAL; | |
b8295acd | 2190 | |
fb1fc7ad LR |
2191 | /* |
2192 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 2193 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
2194 | * domain we keep it for its private use |
2195 | */ | |
7db90f4a | 2196 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 2197 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
2198 | else |
2199 | kfree(rd); | |
2200 | ||
b8295acd LR |
2201 | rd = NULL; |
2202 | ||
a042994d | 2203 | reset_regdomains(false); |
b8295acd LR |
2204 | cfg80211_regdomain = intersected_rd; |
2205 | ||
2206 | return 0; | |
9c96477d LR |
2207 | } |
2208 | ||
3f2355cb LR |
2209 | if (!intersected_rd) |
2210 | return -EINVAL; | |
2211 | ||
79c97e97 | 2212 | rdev = wiphy_to_dev(request_wiphy); |
3f2355cb | 2213 | |
79c97e97 JB |
2214 | rdev->country_ie_alpha2[0] = rd->alpha2[0]; |
2215 | rdev->country_ie_alpha2[1] = rd->alpha2[1]; | |
2216 | rdev->env = last_request->country_ie_env; | |
3f2355cb LR |
2217 | |
2218 | BUG_ON(intersected_rd == rd); | |
2219 | ||
2220 | kfree(rd); | |
2221 | rd = NULL; | |
2222 | ||
a042994d | 2223 | reset_regdomains(false); |
3f2355cb | 2224 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2225 | |
2226 | return 0; | |
2227 | } | |
2228 | ||
2229 | ||
fb1fc7ad LR |
2230 | /* |
2231 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2232 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2233 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2234 | */ | |
a3d2eaf0 | 2235 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2236 | { |
b2e1b302 LR |
2237 | int r; |
2238 | ||
761cf7ec LR |
2239 | assert_cfg80211_lock(); |
2240 | ||
abc7381b LR |
2241 | mutex_lock(®_mutex); |
2242 | ||
b2e1b302 LR |
2243 | /* Note that this doesn't update the wiphys, this is done below */ |
2244 | r = __set_regdom(rd); | |
d2372b31 JB |
2245 | if (r) { |
2246 | kfree(rd); | |
abc7381b | 2247 | mutex_unlock(®_mutex); |
b2e1b302 | 2248 | return r; |
d2372b31 | 2249 | } |
b2e1b302 | 2250 | |
b2e1b302 | 2251 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2252 | if (!last_request->intersect) |
2253 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2254 | |
2255 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2256 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2257 | |
a01ddafd | 2258 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2259 | |
73d54c9e LR |
2260 | nl80211_send_reg_change_event(last_request); |
2261 | ||
b2e253cf LR |
2262 | reg_set_request_processed(); |
2263 | ||
abc7381b LR |
2264 | mutex_unlock(®_mutex); |
2265 | ||
b2e1b302 LR |
2266 | return r; |
2267 | } | |
2268 | ||
4d9d88d1 SJR |
2269 | #ifdef CONFIG_HOTPLUG |
2270 | int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
2271 | { | |
2272 | if (last_request && !last_request->processed) { | |
2273 | if (add_uevent_var(env, "COUNTRY=%c%c", | |
2274 | last_request->alpha2[0], | |
2275 | last_request->alpha2[1])) | |
2276 | return -ENOMEM; | |
2277 | } | |
2278 | ||
2279 | return 0; | |
2280 | } | |
2281 | #else | |
2282 | int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
2283 | { | |
2284 | return -ENODEV; | |
2285 | } | |
2286 | #endif /* CONFIG_HOTPLUG */ | |
2287 | ||
a1794390 | 2288 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2289 | void reg_device_remove(struct wiphy *wiphy) |
2290 | { | |
0ad8acaf | 2291 | struct wiphy *request_wiphy = NULL; |
806a9e39 | 2292 | |
761cf7ec LR |
2293 | assert_cfg80211_lock(); |
2294 | ||
abc7381b LR |
2295 | mutex_lock(®_mutex); |
2296 | ||
0ef9ccdd CW |
2297 | kfree(wiphy->regd); |
2298 | ||
0ad8acaf LR |
2299 | if (last_request) |
2300 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
806a9e39 | 2301 | |
0ef9ccdd | 2302 | if (!request_wiphy || request_wiphy != wiphy) |
abc7381b | 2303 | goto out; |
0ef9ccdd | 2304 | |
806a9e39 | 2305 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb | 2306 | last_request->country_ie_env = ENVIRON_ANY; |
abc7381b LR |
2307 | out: |
2308 | mutex_unlock(®_mutex); | |
3f2355cb LR |
2309 | } |
2310 | ||
a90c7a31 LR |
2311 | static void reg_timeout_work(struct work_struct *work) |
2312 | { | |
2313 | REG_DBG_PRINT("Timeout while waiting for CRDA to reply, " | |
12c5ffb5 | 2314 | "restoring regulatory settings\n"); |
a90c7a31 LR |
2315 | restore_regulatory_settings(true); |
2316 | } | |
2317 | ||
2fcc9f73 | 2318 | int __init regulatory_init(void) |
b2e1b302 | 2319 | { |
bcf4f99b | 2320 | int err = 0; |
734366de | 2321 | |
b2e1b302 LR |
2322 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2323 | if (IS_ERR(reg_pdev)) | |
2324 | return PTR_ERR(reg_pdev); | |
734366de | 2325 | |
4d9d88d1 SJR |
2326 | reg_pdev->dev.type = ®_device_type; |
2327 | ||
fe33eb39 | 2328 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2329 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2330 | |
a3d2eaf0 | 2331 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2332 | |
09d989d1 LR |
2333 | user_alpha2[0] = '9'; |
2334 | user_alpha2[1] = '7'; | |
2335 | ||
ae9e4b0d LR |
2336 | /* We always try to get an update for the static regdomain */ |
2337 | err = regulatory_hint_core(cfg80211_regdomain->alpha2); | |
ba25c141 | 2338 | if (err) { |
bcf4f99b LR |
2339 | if (err == -ENOMEM) |
2340 | return err; | |
2341 | /* | |
2342 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2343 | * memory which is handled and propagated appropriately above | |
2344 | * but it can also fail during a netlink_broadcast() or during | |
2345 | * early boot for call_usermodehelper(). For now treat these | |
2346 | * errors as non-fatal. | |
2347 | */ | |
e9c0268f | 2348 | pr_err("kobject_uevent_env() was unable to call CRDA during init\n"); |
bcf4f99b LR |
2349 | #ifdef CONFIG_CFG80211_REG_DEBUG |
2350 | /* We want to find out exactly why when debugging */ | |
2351 | WARN_ON(err); | |
734366de | 2352 | #endif |
bcf4f99b | 2353 | } |
734366de | 2354 | |
ae9e4b0d LR |
2355 | /* |
2356 | * Finally, if the user set the module parameter treat it | |
2357 | * as a user hint. | |
2358 | */ | |
2359 | if (!is_world_regdom(ieee80211_regdom)) | |
2360 | regulatory_hint_user(ieee80211_regdom); | |
2361 | ||
b2e1b302 LR |
2362 | return 0; |
2363 | } | |
2364 | ||
2fcc9f73 | 2365 | void /* __init_or_exit */ regulatory_exit(void) |
b2e1b302 | 2366 | { |
fe33eb39 | 2367 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2368 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2369 | |
2370 | cancel_work_sync(®_work); | |
a90c7a31 | 2371 | cancel_delayed_work_sync(®_timeout); |
fe33eb39 | 2372 | |
a1794390 | 2373 | mutex_lock(&cfg80211_mutex); |
abc7381b | 2374 | mutex_lock(®_mutex); |
734366de | 2375 | |
a042994d | 2376 | reset_regdomains(true); |
734366de | 2377 | |
58ebacc6 | 2378 | dev_set_uevent_suppress(®_pdev->dev, true); |
f6037d09 | 2379 | |
b2e1b302 | 2380 | platform_device_unregister(reg_pdev); |
734366de | 2381 | |
e38f8a7a LR |
2382 | spin_lock_bh(®_pending_beacons_lock); |
2383 | if (!list_empty(®_pending_beacons)) { | |
2384 | list_for_each_entry_safe(reg_beacon, btmp, | |
2385 | ®_pending_beacons, list) { | |
2386 | list_del(®_beacon->list); | |
2387 | kfree(reg_beacon); | |
2388 | } | |
2389 | } | |
2390 | spin_unlock_bh(®_pending_beacons_lock); | |
2391 | ||
2392 | if (!list_empty(®_beacon_list)) { | |
2393 | list_for_each_entry_safe(reg_beacon, btmp, | |
2394 | ®_beacon_list, list) { | |
2395 | list_del(®_beacon->list); | |
2396 | kfree(reg_beacon); | |
2397 | } | |
2398 | } | |
2399 | ||
fe33eb39 LR |
2400 | spin_lock(®_requests_lock); |
2401 | if (!list_empty(®_requests_list)) { | |
2402 | list_for_each_entry_safe(reg_request, tmp, | |
2403 | ®_requests_list, list) { | |
2404 | list_del(®_request->list); | |
2405 | kfree(reg_request); | |
2406 | } | |
2407 | } | |
2408 | spin_unlock(®_requests_lock); | |
2409 | ||
abc7381b | 2410 | mutex_unlock(®_mutex); |
a1794390 | 2411 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2412 | } |