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Commit | Line | Data |
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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 | ||
5166ccd2 | 60 | /* Receipt of information from last regulatory request */ |
f6037d09 | 61 | static struct regulatory_request *last_request; |
734366de | 62 | |
b2e1b302 LR |
63 | /* To trigger userspace events */ |
64 | static struct platform_device *reg_pdev; | |
8318d78a | 65 | |
4d9d88d1 SJR |
66 | static struct device_type reg_device_type = { |
67 | .uevent = reg_device_uevent, | |
68 | }; | |
69 | ||
fb1fc7ad LR |
70 | /* |
71 | * Central wireless core regulatory domains, we only need two, | |
734366de | 72 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
73 | * information to give us an alpha2 |
74 | */ | |
f130347c | 75 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 76 | |
abc7381b LR |
77 | /* |
78 | * Protects static reg.c components: | |
79 | * - cfg80211_world_regdom | |
80 | * - cfg80211_regdom | |
abc7381b LR |
81 | * - last_request |
82 | */ | |
670b7f11 | 83 | static DEFINE_MUTEX(reg_mutex); |
46a5ebaf JB |
84 | |
85 | static inline void assert_reg_lock(void) | |
86 | { | |
87 | lockdep_assert_held(®_mutex); | |
88 | } | |
abc7381b | 89 | |
e38f8a7a | 90 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
91 | static LIST_HEAD(reg_requests_list); |
92 | static spinlock_t reg_requests_lock; | |
93 | ||
e38f8a7a LR |
94 | /* Used to queue up beacon hints for review */ |
95 | static LIST_HEAD(reg_pending_beacons); | |
96 | static spinlock_t reg_pending_beacons_lock; | |
97 | ||
98 | /* Used to keep track of processed beacon hints */ | |
99 | static LIST_HEAD(reg_beacon_list); | |
100 | ||
101 | struct reg_beacon { | |
102 | struct list_head list; | |
103 | struct ieee80211_channel chan; | |
104 | }; | |
105 | ||
f333a7a2 LR |
106 | static void reg_todo(struct work_struct *work); |
107 | static DECLARE_WORK(reg_work, reg_todo); | |
108 | ||
a90c7a31 LR |
109 | static void reg_timeout_work(struct work_struct *work); |
110 | static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work); | |
111 | ||
734366de JB |
112 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
113 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 114 | .n_reg_rules = 5, |
734366de JB |
115 | .alpha2 = "00", |
116 | .reg_rules = { | |
68798a62 LR |
117 | /* IEEE 802.11b/g, channels 1..11 */ |
118 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
119 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
120 | * channel fits here. */ | |
121 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
122 | NL80211_RRF_PASSIVE_SCAN | |
123 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
124 | /* IEEE 802.11 channel 14 - Only JP enables |
125 | * this and for 802.11b only */ | |
126 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
127 | NL80211_RRF_PASSIVE_SCAN | | |
128 | NL80211_RRF_NO_IBSS | | |
129 | NL80211_RRF_NO_OFDM), | |
130 | /* IEEE 802.11a, channel 36..48 */ | |
ec329ace | 131 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
132 | NL80211_RRF_PASSIVE_SCAN | |
133 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
134 | |
135 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
136 | ||
137 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 138 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
139 | NL80211_RRF_PASSIVE_SCAN | |
140 | NL80211_RRF_NO_IBSS), | |
734366de JB |
141 | } |
142 | }; | |
143 | ||
a3d2eaf0 JB |
144 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
145 | &world_regdom; | |
734366de | 146 | |
6ee7d330 | 147 | static char *ieee80211_regdom = "00"; |
09d989d1 | 148 | static char user_alpha2[2]; |
6ee7d330 | 149 | |
734366de JB |
150 | module_param(ieee80211_regdom, charp, 0444); |
151 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
152 | ||
734366de JB |
153 | static void reset_regdomains(void) |
154 | { | |
942b25cf JB |
155 | /* avoid freeing static information or freeing something twice */ |
156 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
157 | cfg80211_regdomain = NULL; | |
158 | if (cfg80211_world_regdom == &world_regdom) | |
159 | cfg80211_world_regdom = NULL; | |
160 | if (cfg80211_regdomain == &world_regdom) | |
161 | cfg80211_regdomain = NULL; | |
942b25cf JB |
162 | |
163 | kfree(cfg80211_regdomain); | |
164 | kfree(cfg80211_world_regdom); | |
734366de | 165 | |
a3d2eaf0 | 166 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
167 | cfg80211_regdomain = NULL; |
168 | } | |
169 | ||
fb1fc7ad LR |
170 | /* |
171 | * Dynamic world regulatory domain requested by the wireless | |
172 | * core upon initialization | |
173 | */ | |
a3d2eaf0 | 174 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 175 | { |
f6037d09 | 176 | BUG_ON(!last_request); |
734366de JB |
177 | |
178 | reset_regdomains(); | |
179 | ||
180 | cfg80211_world_regdom = rd; | |
181 | cfg80211_regdomain = rd; | |
182 | } | |
734366de | 183 | |
a3d2eaf0 | 184 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
185 | { |
186 | if (!alpha2) | |
187 | return false; | |
188 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
189 | return true; | |
190 | return false; | |
191 | } | |
8318d78a | 192 | |
a3d2eaf0 | 193 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
194 | { |
195 | if (!alpha2) | |
196 | return false; | |
197 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
198 | return true; | |
199 | return false; | |
200 | } | |
8318d78a | 201 | |
a3d2eaf0 | 202 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
203 | { |
204 | if (!alpha2) | |
205 | return false; | |
fb1fc7ad LR |
206 | /* |
207 | * Special case where regulatory domain was built by driver | |
208 | * but a specific alpha2 cannot be determined | |
209 | */ | |
b2e1b302 LR |
210 | if (alpha2[0] == '9' && alpha2[1] == '9') |
211 | return true; | |
212 | return false; | |
213 | } | |
8318d78a | 214 | |
3f2355cb LR |
215 | static bool is_intersected_alpha2(const char *alpha2) |
216 | { | |
217 | if (!alpha2) | |
218 | return false; | |
fb1fc7ad LR |
219 | /* |
220 | * Special case where regulatory domain is the | |
3f2355cb | 221 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
222 | * structures |
223 | */ | |
3f2355cb LR |
224 | if (alpha2[0] == '9' && alpha2[1] == '8') |
225 | return true; | |
226 | return false; | |
227 | } | |
228 | ||
a3d2eaf0 | 229 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
230 | { |
231 | if (!alpha2) | |
232 | return false; | |
c61029c7 | 233 | if (isalpha(alpha2[0]) && isalpha(alpha2[1])) |
b2e1b302 LR |
234 | return true; |
235 | return false; | |
236 | } | |
8318d78a | 237 | |
a3d2eaf0 | 238 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
239 | { |
240 | if (!alpha2_x || !alpha2_y) | |
241 | return false; | |
242 | if (alpha2_x[0] == alpha2_y[0] && | |
243 | alpha2_x[1] == alpha2_y[1]) | |
244 | return true; | |
245 | return false; | |
246 | } | |
247 | ||
69b1572b | 248 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 249 | { |
761cf7ec LR |
250 | assert_cfg80211_lock(); |
251 | ||
b2e1b302 LR |
252 | if (!cfg80211_regdomain) |
253 | return true; | |
254 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
255 | return false; | |
256 | return true; | |
257 | } | |
258 | ||
09d989d1 LR |
259 | /* |
260 | * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets | |
261 | * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER | |
262 | * has ever been issued. | |
263 | */ | |
264 | static bool is_user_regdom_saved(void) | |
265 | { | |
266 | if (user_alpha2[0] == '9' && user_alpha2[1] == '7') | |
267 | return false; | |
268 | ||
269 | /* This would indicate a mistake on the design */ | |
270 | if (WARN((!is_world_regdom(user_alpha2) && | |
271 | !is_an_alpha2(user_alpha2)), | |
272 | "Unexpected user alpha2: %c%c\n", | |
273 | user_alpha2[0], | |
274 | user_alpha2[1])) | |
275 | return false; | |
276 | ||
277 | return true; | |
278 | } | |
279 | ||
3b377ea9 JL |
280 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
281 | const struct ieee80211_regdomain *src_regd) | |
282 | { | |
283 | struct ieee80211_regdomain *regd; | |
284 | int size_of_regd = 0; | |
285 | unsigned int i; | |
286 | ||
287 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
288 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
289 | ||
290 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
291 | if (!regd) | |
292 | return -ENOMEM; | |
293 | ||
294 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
295 | ||
296 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
297 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
298 | sizeof(struct ieee80211_reg_rule)); | |
299 | ||
300 | *dst_regd = regd; | |
301 | return 0; | |
302 | } | |
303 | ||
304 | #ifdef CONFIG_CFG80211_INTERNAL_REGDB | |
305 | struct reg_regdb_search_request { | |
306 | char alpha2[2]; | |
307 | struct list_head list; | |
308 | }; | |
309 | ||
310 | static LIST_HEAD(reg_regdb_search_list); | |
368d06f5 | 311 | static DEFINE_MUTEX(reg_regdb_search_mutex); |
3b377ea9 JL |
312 | |
313 | static void reg_regdb_search(struct work_struct *work) | |
314 | { | |
315 | struct reg_regdb_search_request *request; | |
316 | const struct ieee80211_regdomain *curdom, *regdom; | |
317 | int i, r; | |
318 | ||
368d06f5 | 319 | mutex_lock(®_regdb_search_mutex); |
3b377ea9 JL |
320 | while (!list_empty(®_regdb_search_list)) { |
321 | request = list_first_entry(®_regdb_search_list, | |
322 | struct reg_regdb_search_request, | |
323 | list); | |
324 | list_del(&request->list); | |
325 | ||
326 | for (i=0; i<reg_regdb_size; i++) { | |
327 | curdom = reg_regdb[i]; | |
328 | ||
329 | if (!memcmp(request->alpha2, curdom->alpha2, 2)) { | |
330 | r = reg_copy_regd(®dom, curdom); | |
331 | if (r) | |
332 | break; | |
3b377ea9 JL |
333 | mutex_lock(&cfg80211_mutex); |
334 | set_regdom(regdom); | |
335 | mutex_unlock(&cfg80211_mutex); | |
3b377ea9 JL |
336 | break; |
337 | } | |
338 | } | |
339 | ||
340 | kfree(request); | |
341 | } | |
368d06f5 | 342 | mutex_unlock(®_regdb_search_mutex); |
3b377ea9 JL |
343 | } |
344 | ||
345 | static DECLARE_WORK(reg_regdb_work, reg_regdb_search); | |
346 | ||
347 | static void reg_regdb_query(const char *alpha2) | |
348 | { | |
349 | struct reg_regdb_search_request *request; | |
350 | ||
351 | if (!alpha2) | |
352 | return; | |
353 | ||
354 | request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL); | |
355 | if (!request) | |
356 | return; | |
357 | ||
358 | memcpy(request->alpha2, alpha2, 2); | |
359 | ||
368d06f5 | 360 | mutex_lock(®_regdb_search_mutex); |
3b377ea9 | 361 | list_add_tail(&request->list, ®_regdb_search_list); |
368d06f5 | 362 | mutex_unlock(®_regdb_search_mutex); |
3b377ea9 JL |
363 | |
364 | schedule_work(®_regdb_work); | |
365 | } | |
366 | #else | |
367 | static inline void reg_regdb_query(const char *alpha2) {} | |
368 | #endif /* CONFIG_CFG80211_INTERNAL_REGDB */ | |
369 | ||
fb1fc7ad LR |
370 | /* |
371 | * This lets us keep regulatory code which is updated on a regulatory | |
4d9d88d1 SJR |
372 | * basis in userspace. Country information is filled in by |
373 | * reg_device_uevent | |
fb1fc7ad | 374 | */ |
b2e1b302 LR |
375 | static int call_crda(const char *alpha2) |
376 | { | |
b2e1b302 | 377 | if (!is_world_regdom((char *) alpha2)) |
e9c0268f | 378 | pr_info("Calling CRDA for country: %c%c\n", |
b2e1b302 LR |
379 | alpha2[0], alpha2[1]); |
380 | else | |
e9c0268f | 381 | pr_info("Calling CRDA to update world regulatory domain\n"); |
b2e1b302 | 382 | |
3b377ea9 JL |
383 | /* query internal regulatory database (if it exists) */ |
384 | reg_regdb_query(alpha2); | |
385 | ||
4d9d88d1 | 386 | return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE); |
b2e1b302 LR |
387 | } |
388 | ||
b2e1b302 | 389 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 390 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 391 | { |
61405e97 LR |
392 | assert_cfg80211_lock(); |
393 | ||
f6037d09 JB |
394 | if (!last_request) |
395 | return false; | |
396 | ||
397 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 398 | } |
8318d78a | 399 | |
b2e1b302 | 400 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 401 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 402 | { |
a3d2eaf0 | 403 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
404 | u32 freq_diff; |
405 | ||
91e99004 | 406 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
407 | return false; |
408 | ||
409 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
410 | return false; | |
411 | ||
412 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
413 | ||
bd05f28e RK |
414 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
415 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
416 | return false; |
417 | ||
418 | return true; | |
419 | } | |
420 | ||
a3d2eaf0 | 421 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 422 | { |
a3d2eaf0 | 423 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 424 | unsigned int i; |
8318d78a | 425 | |
b2e1b302 LR |
426 | if (!rd->n_reg_rules) |
427 | return false; | |
8318d78a | 428 | |
88dc1c3f LR |
429 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
430 | return false; | |
431 | ||
b2e1b302 LR |
432 | for (i = 0; i < rd->n_reg_rules; i++) { |
433 | reg_rule = &rd->reg_rules[i]; | |
434 | if (!is_valid_reg_rule(reg_rule)) | |
435 | return false; | |
436 | } | |
437 | ||
438 | return true; | |
8318d78a JB |
439 | } |
440 | ||
038659e7 LR |
441 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, |
442 | u32 center_freq_khz, | |
443 | u32 bw_khz) | |
b2e1b302 | 444 | { |
038659e7 LR |
445 | u32 start_freq_khz, end_freq_khz; |
446 | ||
447 | start_freq_khz = center_freq_khz - (bw_khz/2); | |
448 | end_freq_khz = center_freq_khz + (bw_khz/2); | |
449 | ||
450 | if (start_freq_khz >= freq_range->start_freq_khz && | |
451 | end_freq_khz <= freq_range->end_freq_khz) | |
452 | return true; | |
453 | ||
454 | return false; | |
b2e1b302 | 455 | } |
8318d78a | 456 | |
0c7dc45d LR |
457 | /** |
458 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
459 | * @freq_range: frequency rule we want to query | |
460 | * @freq_khz: frequency we are inquiring about | |
461 | * | |
462 | * This lets us know if a specific frequency rule is or is not relevant to | |
463 | * a specific frequency's band. Bands are device specific and artificial | |
464 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
465 | * safe for now to assume that a frequency rule should not be part of a | |
466 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
467 | * This resolution can be lowered and should be considered as we add | |
468 | * regulatory rule support for other "bands". | |
469 | **/ | |
470 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
471 | u32 freq_khz) | |
472 | { | |
473 | #define ONE_GHZ_IN_KHZ 1000000 | |
474 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
475 | return true; | |
476 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
477 | return true; | |
478 | return false; | |
479 | #undef ONE_GHZ_IN_KHZ | |
480 | } | |
481 | ||
fb1fc7ad LR |
482 | /* |
483 | * Helper for regdom_intersect(), this does the real | |
484 | * mathematical intersection fun | |
485 | */ | |
9c96477d LR |
486 | static int reg_rules_intersect( |
487 | const struct ieee80211_reg_rule *rule1, | |
488 | const struct ieee80211_reg_rule *rule2, | |
489 | struct ieee80211_reg_rule *intersected_rule) | |
490 | { | |
491 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
492 | struct ieee80211_freq_range *freq_range; | |
493 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
494 | struct ieee80211_power_rule *power_rule; | |
495 | u32 freq_diff; | |
496 | ||
497 | freq_range1 = &rule1->freq_range; | |
498 | freq_range2 = &rule2->freq_range; | |
499 | freq_range = &intersected_rule->freq_range; | |
500 | ||
501 | power_rule1 = &rule1->power_rule; | |
502 | power_rule2 = &rule2->power_rule; | |
503 | power_rule = &intersected_rule->power_rule; | |
504 | ||
505 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
506 | freq_range2->start_freq_khz); | |
507 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
508 | freq_range2->end_freq_khz); | |
509 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
510 | freq_range2->max_bandwidth_khz); | |
511 | ||
512 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
513 | if (freq_range->max_bandwidth_khz > freq_diff) | |
514 | freq_range->max_bandwidth_khz = freq_diff; | |
515 | ||
516 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
517 | power_rule2->max_eirp); | |
518 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
519 | power_rule2->max_antenna_gain); | |
520 | ||
521 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
522 | ||
523 | if (!is_valid_reg_rule(intersected_rule)) | |
524 | return -EINVAL; | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | /** | |
530 | * regdom_intersect - do the intersection between two regulatory domains | |
531 | * @rd1: first regulatory domain | |
532 | * @rd2: second regulatory domain | |
533 | * | |
534 | * Use this function to get the intersection between two regulatory domains. | |
535 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
536 | * as no one single alpha2 can represent this regulatory domain. | |
537 | * | |
538 | * Returns a pointer to the regulatory domain structure which will hold the | |
539 | * resulting intersection of rules between rd1 and rd2. We will | |
540 | * kzalloc() this structure for you. | |
541 | */ | |
542 | static struct ieee80211_regdomain *regdom_intersect( | |
543 | const struct ieee80211_regdomain *rd1, | |
544 | const struct ieee80211_regdomain *rd2) | |
545 | { | |
546 | int r, size_of_regd; | |
547 | unsigned int x, y; | |
548 | unsigned int num_rules = 0, rule_idx = 0; | |
549 | const struct ieee80211_reg_rule *rule1, *rule2; | |
550 | struct ieee80211_reg_rule *intersected_rule; | |
551 | struct ieee80211_regdomain *rd; | |
552 | /* This is just a dummy holder to help us count */ | |
553 | struct ieee80211_reg_rule irule; | |
554 | ||
555 | /* Uses the stack temporarily for counter arithmetic */ | |
556 | intersected_rule = &irule; | |
557 | ||
558 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
559 | ||
560 | if (!rd1 || !rd2) | |
561 | return NULL; | |
562 | ||
fb1fc7ad LR |
563 | /* |
564 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
565 | * build them. This is to so we can malloc() and free() a |
566 | * regdomain once. The reason we use reg_rules_intersect() here | |
567 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
568 | * All rules that do check out OK are valid. |
569 | */ | |
9c96477d LR |
570 | |
571 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
572 | rule1 = &rd1->reg_rules[x]; | |
573 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
574 | rule2 = &rd2->reg_rules[y]; | |
575 | if (!reg_rules_intersect(rule1, rule2, | |
576 | intersected_rule)) | |
577 | num_rules++; | |
578 | memset(intersected_rule, 0, | |
579 | sizeof(struct ieee80211_reg_rule)); | |
580 | } | |
581 | } | |
582 | ||
583 | if (!num_rules) | |
584 | return NULL; | |
585 | ||
586 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
587 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
588 | ||
589 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
590 | if (!rd) | |
591 | return NULL; | |
592 | ||
593 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
594 | rule1 = &rd1->reg_rules[x]; | |
595 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
596 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
597 | /* |
598 | * This time around instead of using the stack lets | |
9c96477d | 599 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
600 | * a memcpy() |
601 | */ | |
9c96477d LR |
602 | intersected_rule = &rd->reg_rules[rule_idx]; |
603 | r = reg_rules_intersect(rule1, rule2, | |
604 | intersected_rule); | |
fb1fc7ad LR |
605 | /* |
606 | * No need to memset here the intersected rule here as | |
607 | * we're not using the stack anymore | |
608 | */ | |
9c96477d LR |
609 | if (r) |
610 | continue; | |
611 | rule_idx++; | |
612 | } | |
613 | } | |
614 | ||
615 | if (rule_idx != num_rules) { | |
616 | kfree(rd); | |
617 | return NULL; | |
618 | } | |
619 | ||
620 | rd->n_reg_rules = num_rules; | |
621 | rd->alpha2[0] = '9'; | |
622 | rd->alpha2[1] = '8'; | |
623 | ||
624 | return rd; | |
625 | } | |
626 | ||
fb1fc7ad LR |
627 | /* |
628 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
629 | * want to just have the channel structure use these | |
630 | */ | |
b2e1b302 LR |
631 | static u32 map_regdom_flags(u32 rd_flags) |
632 | { | |
633 | u32 channel_flags = 0; | |
634 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
635 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
636 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
637 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
638 | if (rd_flags & NL80211_RRF_DFS) | |
639 | channel_flags |= IEEE80211_CHAN_RADAR; | |
640 | return channel_flags; | |
641 | } | |
642 | ||
1fa25e41 LR |
643 | static int freq_reg_info_regd(struct wiphy *wiphy, |
644 | u32 center_freq, | |
038659e7 | 645 | u32 desired_bw_khz, |
1fa25e41 LR |
646 | const struct ieee80211_reg_rule **reg_rule, |
647 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
648 | { |
649 | int i; | |
0c7dc45d | 650 | bool band_rule_found = false; |
3e0c3ff3 | 651 | const struct ieee80211_regdomain *regd; |
038659e7 LR |
652 | bool bw_fits = false; |
653 | ||
654 | if (!desired_bw_khz) | |
655 | desired_bw_khz = MHZ_TO_KHZ(20); | |
8318d78a | 656 | |
1fa25e41 | 657 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 658 | |
fb1fc7ad LR |
659 | /* |
660 | * Follow the driver's regulatory domain, if present, unless a country | |
661 | * IE has been processed or a user wants to help complaince further | |
662 | */ | |
2784fe91 LR |
663 | if (!custom_regd && |
664 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
7db90f4a | 665 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && |
3e0c3ff3 LR |
666 | wiphy->regd) |
667 | regd = wiphy->regd; | |
668 | ||
669 | if (!regd) | |
b2e1b302 LR |
670 | return -EINVAL; |
671 | ||
3e0c3ff3 | 672 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
673 | const struct ieee80211_reg_rule *rr; |
674 | const struct ieee80211_freq_range *fr = NULL; | |
b2e1b302 | 675 | |
3e0c3ff3 | 676 | rr = ®d->reg_rules[i]; |
b2e1b302 | 677 | fr = &rr->freq_range; |
0c7dc45d | 678 | |
fb1fc7ad LR |
679 | /* |
680 | * We only need to know if one frequency rule was | |
0c7dc45d | 681 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
682 | * not overwrite it once found |
683 | */ | |
0c7dc45d LR |
684 | if (!band_rule_found) |
685 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
686 | ||
038659e7 LR |
687 | bw_fits = reg_does_bw_fit(fr, |
688 | center_freq, | |
689 | desired_bw_khz); | |
0c7dc45d | 690 | |
038659e7 | 691 | if (band_rule_found && bw_fits) { |
b2e1b302 | 692 | *reg_rule = rr; |
038659e7 | 693 | return 0; |
8318d78a JB |
694 | } |
695 | } | |
696 | ||
0c7dc45d LR |
697 | if (!band_rule_found) |
698 | return -ERANGE; | |
699 | ||
038659e7 | 700 | return -EINVAL; |
b2e1b302 LR |
701 | } |
702 | ||
038659e7 LR |
703 | int freq_reg_info(struct wiphy *wiphy, |
704 | u32 center_freq, | |
705 | u32 desired_bw_khz, | |
706 | const struct ieee80211_reg_rule **reg_rule) | |
1fa25e41 | 707 | { |
ac46d48e | 708 | assert_cfg80211_lock(); |
038659e7 LR |
709 | return freq_reg_info_regd(wiphy, |
710 | center_freq, | |
711 | desired_bw_khz, | |
712 | reg_rule, | |
713 | NULL); | |
1fa25e41 | 714 | } |
4f366c5d | 715 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 716 | |
926a0a09 LR |
717 | #ifdef CONFIG_CFG80211_REG_DEBUG |
718 | static const char *reg_initiator_name(enum nl80211_reg_initiator initiator) | |
719 | { | |
720 | switch (initiator) { | |
721 | case NL80211_REGDOM_SET_BY_CORE: | |
722 | return "Set by core"; | |
723 | case NL80211_REGDOM_SET_BY_USER: | |
724 | return "Set by user"; | |
725 | case NL80211_REGDOM_SET_BY_DRIVER: | |
726 | return "Set by driver"; | |
727 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
728 | return "Set by country IE"; | |
729 | default: | |
730 | WARN_ON(1); | |
731 | return "Set by bug"; | |
732 | } | |
733 | } | |
e702d3cf LR |
734 | |
735 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, | |
736 | u32 desired_bw_khz, | |
737 | const struct ieee80211_reg_rule *reg_rule) | |
738 | { | |
739 | const struct ieee80211_power_rule *power_rule; | |
740 | const struct ieee80211_freq_range *freq_range; | |
741 | char max_antenna_gain[32]; | |
742 | ||
743 | power_rule = ®_rule->power_rule; | |
744 | freq_range = ®_rule->freq_range; | |
745 | ||
746 | if (!power_rule->max_antenna_gain) | |
747 | snprintf(max_antenna_gain, 32, "N/A"); | |
748 | else | |
749 | snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain); | |
750 | ||
d91e41b6 | 751 | REG_DBG_PRINT("Updating information on frequency %d MHz " |
ff039c6f | 752 | "for a %d MHz width channel with regulatory rule:\n", |
e702d3cf LR |
753 | chan->center_freq, |
754 | KHZ_TO_MHZ(desired_bw_khz)); | |
755 | ||
56e6786e | 756 | REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n", |
e702d3cf LR |
757 | freq_range->start_freq_khz, |
758 | freq_range->end_freq_khz, | |
56e6786e | 759 | freq_range->max_bandwidth_khz, |
e702d3cf LR |
760 | max_antenna_gain, |
761 | power_rule->max_eirp); | |
762 | } | |
763 | #else | |
764 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, | |
765 | u32 desired_bw_khz, | |
766 | const struct ieee80211_reg_rule *reg_rule) | |
767 | { | |
768 | return; | |
769 | } | |
926a0a09 LR |
770 | #endif |
771 | ||
038659e7 LR |
772 | /* |
773 | * Note that right now we assume the desired channel bandwidth | |
774 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz | |
775 | * per channel, the primary and the extension channel). To support | |
776 | * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a | |
777 | * new ieee80211_channel.target_bw and re run the regulatory check | |
778 | * on the wiphy with the target_bw specified. Then we can simply use | |
779 | * that below for the desired_bw_khz below. | |
780 | */ | |
7ca43d03 LR |
781 | static void handle_channel(struct wiphy *wiphy, |
782 | enum nl80211_reg_initiator initiator, | |
783 | enum ieee80211_band band, | |
a92a3ce7 | 784 | unsigned int chan_idx) |
b2e1b302 LR |
785 | { |
786 | int r; | |
038659e7 LR |
787 | u32 flags, bw_flags = 0; |
788 | u32 desired_bw_khz = MHZ_TO_KHZ(20); | |
b2e1b302 LR |
789 | const struct ieee80211_reg_rule *reg_rule = NULL; |
790 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 791 | const struct ieee80211_freq_range *freq_range = NULL; |
a92a3ce7 LR |
792 | struct ieee80211_supported_band *sband; |
793 | struct ieee80211_channel *chan; | |
fe33eb39 | 794 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 795 | |
761cf7ec LR |
796 | assert_cfg80211_lock(); |
797 | ||
806a9e39 LR |
798 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
799 | ||
a92a3ce7 LR |
800 | sband = wiphy->bands[band]; |
801 | BUG_ON(chan_idx >= sband->n_channels); | |
802 | chan = &sband->channels[chan_idx]; | |
803 | ||
804 | flags = chan->orig_flags; | |
b2e1b302 | 805 | |
038659e7 LR |
806 | r = freq_reg_info(wiphy, |
807 | MHZ_TO_KHZ(chan->center_freq), | |
808 | desired_bw_khz, | |
809 | ®_rule); | |
b2e1b302 | 810 | |
ca4ffe8f LR |
811 | if (r) { |
812 | /* | |
813 | * We will disable all channels that do not match our | |
25985edc | 814 | * received regulatory rule unless the hint is coming |
ca4ffe8f LR |
815 | * from a Country IE and the Country IE had no information |
816 | * about a band. The IEEE 802.11 spec allows for an AP | |
817 | * to send only a subset of the regulatory rules allowed, | |
818 | * so an AP in the US that only supports 2.4 GHz may only send | |
819 | * a country IE with information for the 2.4 GHz band | |
820 | * while 5 GHz is still supported. | |
821 | */ | |
822 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
823 | r == -ERANGE) | |
824 | return; | |
825 | ||
d91e41b6 | 826 | REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq); |
ca4ffe8f | 827 | chan->flags = IEEE80211_CHAN_DISABLED; |
8318d78a | 828 | return; |
ca4ffe8f | 829 | } |
8318d78a | 830 | |
e702d3cf LR |
831 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
832 | ||
b2e1b302 | 833 | power_rule = ®_rule->power_rule; |
038659e7 LR |
834 | freq_range = ®_rule->freq_range; |
835 | ||
836 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
837 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
b2e1b302 | 838 | |
7db90f4a | 839 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
806a9e39 | 840 | request_wiphy && request_wiphy == wiphy && |
5be83de5 | 841 | request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
fb1fc7ad | 842 | /* |
25985edc | 843 | * This guarantees the driver's requested regulatory domain |
f976376d | 844 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
845 | * settings |
846 | */ | |
f976376d | 847 | chan->flags = chan->orig_flags = |
038659e7 | 848 | map_regdom_flags(reg_rule->flags) | bw_flags; |
f976376d LR |
849 | chan->max_antenna_gain = chan->orig_mag = |
850 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
f976376d LR |
851 | chan->max_power = chan->orig_mpwr = |
852 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
853 | return; | |
854 | } | |
855 | ||
aa3d7eef | 856 | chan->beacon_found = false; |
038659e7 | 857 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 858 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 | 859 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
253898c4 | 860 | if (chan->orig_mpwr) |
b2e1b302 LR |
861 | chan->max_power = min(chan->orig_mpwr, |
862 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 863 | else |
b2e1b302 | 864 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
865 | } |
866 | ||
7ca43d03 LR |
867 | static void handle_band(struct wiphy *wiphy, |
868 | enum ieee80211_band band, | |
869 | enum nl80211_reg_initiator initiator) | |
8318d78a | 870 | { |
a92a3ce7 LR |
871 | unsigned int i; |
872 | struct ieee80211_supported_band *sband; | |
873 | ||
874 | BUG_ON(!wiphy->bands[band]); | |
875 | sband = wiphy->bands[band]; | |
8318d78a JB |
876 | |
877 | for (i = 0; i < sband->n_channels; i++) | |
7ca43d03 | 878 | handle_channel(wiphy, initiator, band, i); |
8318d78a JB |
879 | } |
880 | ||
7db90f4a LR |
881 | static bool ignore_reg_update(struct wiphy *wiphy, |
882 | enum nl80211_reg_initiator initiator) | |
14b9815a | 883 | { |
926a0a09 | 884 | if (!last_request) { |
d91e41b6 | 885 | REG_DBG_PRINT("Ignoring regulatory request %s since " |
926a0a09 LR |
886 | "last_request is not set\n", |
887 | reg_initiator_name(initiator)); | |
14b9815a | 888 | return true; |
926a0a09 LR |
889 | } |
890 | ||
7db90f4a | 891 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
926a0a09 | 892 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { |
d91e41b6 | 893 | REG_DBG_PRINT("Ignoring regulatory request %s " |
926a0a09 | 894 | "since the driver uses its own custom " |
12c5ffb5 | 895 | "regulatory domain\n", |
926a0a09 | 896 | reg_initiator_name(initiator)); |
14b9815a | 897 | return true; |
926a0a09 LR |
898 | } |
899 | ||
fb1fc7ad LR |
900 | /* |
901 | * wiphy->regd will be set once the device has its own | |
902 | * desired regulatory domain set | |
903 | */ | |
5be83de5 | 904 | if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && |
749b527b | 905 | initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
926a0a09 | 906 | !is_world_regdom(last_request->alpha2)) { |
d91e41b6 | 907 | REG_DBG_PRINT("Ignoring regulatory request %s " |
5bc91db8 | 908 | "since the driver requires its own regulatory " |
12c5ffb5 | 909 | "domain to be set first\n", |
926a0a09 | 910 | reg_initiator_name(initiator)); |
14b9815a | 911 | return true; |
926a0a09 LR |
912 | } |
913 | ||
14b9815a LR |
914 | return false; |
915 | } | |
916 | ||
e38f8a7a LR |
917 | static void handle_reg_beacon(struct wiphy *wiphy, |
918 | unsigned int chan_idx, | |
919 | struct reg_beacon *reg_beacon) | |
920 | { | |
e38f8a7a LR |
921 | struct ieee80211_supported_band *sband; |
922 | struct ieee80211_channel *chan; | |
6bad8766 LR |
923 | bool channel_changed = false; |
924 | struct ieee80211_channel chan_before; | |
e38f8a7a LR |
925 | |
926 | assert_cfg80211_lock(); | |
927 | ||
928 | sband = wiphy->bands[reg_beacon->chan.band]; | |
929 | chan = &sband->channels[chan_idx]; | |
930 | ||
931 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
932 | return; | |
933 | ||
6bad8766 LR |
934 | if (chan->beacon_found) |
935 | return; | |
936 | ||
937 | chan->beacon_found = true; | |
938 | ||
5be83de5 | 939 | if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) |
37184244 LR |
940 | return; |
941 | ||
6bad8766 LR |
942 | chan_before.center_freq = chan->center_freq; |
943 | chan_before.flags = chan->flags; | |
944 | ||
37184244 | 945 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { |
e38f8a7a | 946 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; |
6bad8766 | 947 | channel_changed = true; |
e38f8a7a LR |
948 | } |
949 | ||
37184244 | 950 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { |
e38f8a7a | 951 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; |
6bad8766 | 952 | channel_changed = true; |
e38f8a7a LR |
953 | } |
954 | ||
6bad8766 LR |
955 | if (channel_changed) |
956 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
e38f8a7a LR |
957 | } |
958 | ||
959 | /* | |
960 | * Called when a scan on a wiphy finds a beacon on | |
961 | * new channel | |
962 | */ | |
963 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
964 | struct reg_beacon *reg_beacon) | |
965 | { | |
966 | unsigned int i; | |
967 | struct ieee80211_supported_band *sband; | |
968 | ||
969 | assert_cfg80211_lock(); | |
970 | ||
971 | if (!wiphy->bands[reg_beacon->chan.band]) | |
972 | return; | |
973 | ||
974 | sband = wiphy->bands[reg_beacon->chan.band]; | |
975 | ||
976 | for (i = 0; i < sband->n_channels; i++) | |
977 | handle_reg_beacon(wiphy, i, reg_beacon); | |
978 | } | |
979 | ||
980 | /* | |
981 | * Called upon reg changes or a new wiphy is added | |
982 | */ | |
983 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
984 | { | |
985 | unsigned int i; | |
986 | struct ieee80211_supported_band *sband; | |
987 | struct reg_beacon *reg_beacon; | |
988 | ||
989 | assert_cfg80211_lock(); | |
990 | ||
991 | if (list_empty(®_beacon_list)) | |
992 | return; | |
993 | ||
994 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
995 | if (!wiphy->bands[reg_beacon->chan.band]) | |
996 | continue; | |
997 | sband = wiphy->bands[reg_beacon->chan.band]; | |
998 | for (i = 0; i < sband->n_channels; i++) | |
999 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1004 | { | |
1005 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1006 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1007 | return true; | |
b1ed8ddd LR |
1008 | if (last_request && |
1009 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
5be83de5 | 1010 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) |
e38f8a7a LR |
1011 | return true; |
1012 | return false; | |
1013 | } | |
1014 | ||
1015 | /* Reap the advantages of previously found beacons */ | |
1016 | static void reg_process_beacons(struct wiphy *wiphy) | |
1017 | { | |
b1ed8ddd LR |
1018 | /* |
1019 | * Means we are just firing up cfg80211, so no beacons would | |
1020 | * have been processed yet. | |
1021 | */ | |
1022 | if (!last_request) | |
1023 | return; | |
e38f8a7a LR |
1024 | if (!reg_is_world_roaming(wiphy)) |
1025 | return; | |
1026 | wiphy_update_beacon_reg(wiphy); | |
1027 | } | |
1028 | ||
038659e7 LR |
1029 | static bool is_ht40_not_allowed(struct ieee80211_channel *chan) |
1030 | { | |
1031 | if (!chan) | |
1032 | return true; | |
1033 | if (chan->flags & IEEE80211_CHAN_DISABLED) | |
1034 | return true; | |
1035 | /* This would happen when regulatory rules disallow HT40 completely */ | |
1036 | if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) | |
1037 | return true; | |
1038 | return false; | |
1039 | } | |
1040 | ||
1041 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, | |
1042 | enum ieee80211_band band, | |
1043 | unsigned int chan_idx) | |
1044 | { | |
1045 | struct ieee80211_supported_band *sband; | |
1046 | struct ieee80211_channel *channel; | |
1047 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; | |
1048 | unsigned int i; | |
1049 | ||
1050 | assert_cfg80211_lock(); | |
1051 | ||
1052 | sband = wiphy->bands[band]; | |
1053 | BUG_ON(chan_idx >= sband->n_channels); | |
1054 | channel = &sband->channels[chan_idx]; | |
1055 | ||
1056 | if (is_ht40_not_allowed(channel)) { | |
1057 | channel->flags |= IEEE80211_CHAN_NO_HT40; | |
1058 | return; | |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * We need to ensure the extension channels exist to | |
1063 | * be able to use HT40- or HT40+, this finds them (or not) | |
1064 | */ | |
1065 | for (i = 0; i < sband->n_channels; i++) { | |
1066 | struct ieee80211_channel *c = &sband->channels[i]; | |
1067 | if (c->center_freq == (channel->center_freq - 20)) | |
1068 | channel_before = c; | |
1069 | if (c->center_freq == (channel->center_freq + 20)) | |
1070 | channel_after = c; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * Please note that this assumes target bandwidth is 20 MHz, | |
1075 | * if that ever changes we also need to change the below logic | |
1076 | * to include that as well. | |
1077 | */ | |
1078 | if (is_ht40_not_allowed(channel_before)) | |
689da1b3 | 1079 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 | 1080 | else |
689da1b3 | 1081 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 LR |
1082 | |
1083 | if (is_ht40_not_allowed(channel_after)) | |
689da1b3 | 1084 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 | 1085 | else |
689da1b3 | 1086 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 LR |
1087 | } |
1088 | ||
1089 | static void reg_process_ht_flags_band(struct wiphy *wiphy, | |
1090 | enum ieee80211_band band) | |
1091 | { | |
1092 | unsigned int i; | |
1093 | struct ieee80211_supported_band *sband; | |
1094 | ||
1095 | BUG_ON(!wiphy->bands[band]); | |
1096 | sband = wiphy->bands[band]; | |
1097 | ||
1098 | for (i = 0; i < sband->n_channels; i++) | |
1099 | reg_process_ht_flags_channel(wiphy, band, i); | |
1100 | } | |
1101 | ||
1102 | static void reg_process_ht_flags(struct wiphy *wiphy) | |
1103 | { | |
1104 | enum ieee80211_band band; | |
1105 | ||
1106 | if (!wiphy) | |
1107 | return; | |
1108 | ||
1109 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1110 | if (wiphy->bands[band]) | |
1111 | reg_process_ht_flags_band(wiphy, band); | |
1112 | } | |
1113 | ||
1114 | } | |
1115 | ||
eac03e38 SN |
1116 | static void wiphy_update_regulatory(struct wiphy *wiphy, |
1117 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1118 | { |
1119 | enum ieee80211_band band; | |
d46e5b1d | 1120 | |
eac03e38 SN |
1121 | assert_reg_lock(); |
1122 | ||
7db90f4a | 1123 | if (ignore_reg_update(wiphy, initiator)) |
a203c2aa SN |
1124 | return; |
1125 | ||
b2e1b302 | 1126 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1127 | if (wiphy->bands[band]) |
7ca43d03 | 1128 | handle_band(wiphy, band, initiator); |
b2e1b302 | 1129 | } |
a203c2aa | 1130 | |
e38f8a7a | 1131 | reg_process_beacons(wiphy); |
038659e7 | 1132 | reg_process_ht_flags(wiphy); |
560e28e1 | 1133 | if (wiphy->reg_notifier) |
716f9392 | 1134 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1135 | } |
1136 | ||
eac03e38 SN |
1137 | void regulatory_update(struct wiphy *wiphy, |
1138 | enum nl80211_reg_initiator setby) | |
1139 | { | |
1140 | mutex_lock(®_mutex); | |
1141 | wiphy_update_regulatory(wiphy, setby); | |
1142 | mutex_unlock(®_mutex); | |
1143 | } | |
1144 | ||
d7549cbb SN |
1145 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
1146 | { | |
1147 | struct cfg80211_registered_device *rdev; | |
1148 | ||
1149 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) | |
1150 | wiphy_update_regulatory(&rdev->wiphy, initiator); | |
1151 | } | |
1152 | ||
1fa25e41 LR |
1153 | static void handle_channel_custom(struct wiphy *wiphy, |
1154 | enum ieee80211_band band, | |
1155 | unsigned int chan_idx, | |
1156 | const struct ieee80211_regdomain *regd) | |
1157 | { | |
1158 | int r; | |
038659e7 LR |
1159 | u32 desired_bw_khz = MHZ_TO_KHZ(20); |
1160 | u32 bw_flags = 0; | |
1fa25e41 LR |
1161 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1162 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 1163 | const struct ieee80211_freq_range *freq_range = NULL; |
1fa25e41 LR |
1164 | struct ieee80211_supported_band *sband; |
1165 | struct ieee80211_channel *chan; | |
1166 | ||
abc7381b | 1167 | assert_reg_lock(); |
ac46d48e | 1168 | |
1fa25e41 LR |
1169 | sband = wiphy->bands[band]; |
1170 | BUG_ON(chan_idx >= sband->n_channels); | |
1171 | chan = &sband->channels[chan_idx]; | |
1172 | ||
038659e7 LR |
1173 | r = freq_reg_info_regd(wiphy, |
1174 | MHZ_TO_KHZ(chan->center_freq), | |
1175 | desired_bw_khz, | |
1176 | ®_rule, | |
1177 | regd); | |
1fa25e41 LR |
1178 | |
1179 | if (r) { | |
d91e41b6 | 1180 | REG_DBG_PRINT("Disabling freq %d MHz as custom " |
a6518536 LR |
1181 | "regd has no rule that fits a %d MHz " |
1182 | "wide channel\n", | |
1183 | chan->center_freq, | |
1184 | KHZ_TO_MHZ(desired_bw_khz)); | |
1fa25e41 LR |
1185 | chan->flags = IEEE80211_CHAN_DISABLED; |
1186 | return; | |
1187 | } | |
1188 | ||
e702d3cf LR |
1189 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
1190 | ||
1fa25e41 | 1191 | power_rule = ®_rule->power_rule; |
038659e7 LR |
1192 | freq_range = ®_rule->freq_range; |
1193 | ||
1194 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1195 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
1fa25e41 | 1196 | |
038659e7 | 1197 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; |
1fa25e41 | 1198 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); |
1fa25e41 LR |
1199 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
1200 | } | |
1201 | ||
1202 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1203 | const struct ieee80211_regdomain *regd) | |
1204 | { | |
1205 | unsigned int i; | |
1206 | struct ieee80211_supported_band *sband; | |
1207 | ||
1208 | BUG_ON(!wiphy->bands[band]); | |
1209 | sband = wiphy->bands[band]; | |
1210 | ||
1211 | for (i = 0; i < sband->n_channels; i++) | |
1212 | handle_channel_custom(wiphy, band, i, regd); | |
1213 | } | |
1214 | ||
1215 | /* Used by drivers prior to wiphy registration */ | |
1216 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1217 | const struct ieee80211_regdomain *regd) | |
1218 | { | |
1219 | enum ieee80211_band band; | |
bbcf3f02 | 1220 | unsigned int bands_set = 0; |
ac46d48e | 1221 | |
abc7381b | 1222 | mutex_lock(®_mutex); |
1fa25e41 | 1223 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
bbcf3f02 LR |
1224 | if (!wiphy->bands[band]) |
1225 | continue; | |
1226 | handle_band_custom(wiphy, band, regd); | |
1227 | bands_set++; | |
b2e1b302 | 1228 | } |
abc7381b | 1229 | mutex_unlock(®_mutex); |
bbcf3f02 LR |
1230 | |
1231 | /* | |
1232 | * no point in calling this if it won't have any effect | |
1233 | * on your device's supportd bands. | |
1234 | */ | |
1235 | WARN_ON(!bands_set); | |
b2e1b302 | 1236 | } |
1fa25e41 LR |
1237 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1238 | ||
fb1fc7ad LR |
1239 | /* |
1240 | * Return value which can be used by ignore_request() to indicate | |
1241 | * it has been determined we should intersect two regulatory domains | |
1242 | */ | |
9c96477d LR |
1243 | #define REG_INTERSECT 1 |
1244 | ||
84fa4f43 JB |
1245 | /* This has the logic which determines when a new request |
1246 | * should be ignored. */ | |
2f92cd2e LR |
1247 | static int ignore_request(struct wiphy *wiphy, |
1248 | struct regulatory_request *pending_request) | |
84fa4f43 | 1249 | { |
806a9e39 | 1250 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1251 | |
1252 | assert_cfg80211_lock(); | |
1253 | ||
84fa4f43 JB |
1254 | /* All initial requests are respected */ |
1255 | if (!last_request) | |
1256 | return 0; | |
1257 | ||
2f92cd2e | 1258 | switch (pending_request->initiator) { |
7db90f4a | 1259 | case NL80211_REGDOM_SET_BY_CORE: |
09d989d1 | 1260 | return 0; |
7db90f4a | 1261 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1262 | |
1263 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1264 | ||
2f92cd2e | 1265 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1266 | return -EINVAL; |
7db90f4a LR |
1267 | if (last_request->initiator == |
1268 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1269 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1270 | /* |
1271 | * Two cards with two APs claiming different | |
1fe90b03 | 1272 | * Country IE alpha2s. We could |
84fa4f43 JB |
1273 | * intersect them, but that seems unlikely |
1274 | * to be correct. Reject second one for now. | |
1275 | */ | |
2f92cd2e | 1276 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1277 | return -EOPNOTSUPP; |
1278 | return -EALREADY; | |
1279 | } | |
fb1fc7ad LR |
1280 | /* |
1281 | * Two consecutive Country IE hints on the same wiphy. | |
1282 | * This should be picked up early by the driver/stack | |
1283 | */ | |
2f92cd2e | 1284 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1285 | return 0; |
1286 | return -EALREADY; | |
1287 | } | |
a171fba4 | 1288 | return 0; |
7db90f4a LR |
1289 | case NL80211_REGDOM_SET_BY_DRIVER: |
1290 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
2f92cd2e | 1291 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1292 | return 0; |
84fa4f43 | 1293 | return -EALREADY; |
e74b1e7f | 1294 | } |
fff32c04 LR |
1295 | |
1296 | /* | |
1297 | * This would happen if you unplug and plug your card | |
1298 | * back in or if you add a new device for which the previously | |
1299 | * loaded card also agrees on the regulatory domain. | |
1300 | */ | |
7db90f4a | 1301 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1302 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1303 | return -EALREADY; |
1304 | ||
3e0c3ff3 | 1305 | return REG_INTERSECT; |
7db90f4a LR |
1306 | case NL80211_REGDOM_SET_BY_USER: |
1307 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1308 | return REG_INTERSECT; |
fb1fc7ad LR |
1309 | /* |
1310 | * If the user knows better the user should set the regdom | |
1311 | * to their country before the IE is picked up | |
1312 | */ | |
7db90f4a | 1313 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1314 | last_request->intersect) |
1315 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1316 | /* |
1317 | * Process user requests only after previous user/driver/core | |
1318 | * requests have been processed | |
1319 | */ | |
7db90f4a LR |
1320 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1321 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1322 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
69b1572b | 1323 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1324 | return -EAGAIN; |
1325 | } | |
1326 | ||
baeb66fe | 1327 | if (!regdom_changes(pending_request->alpha2)) |
e74b1e7f LR |
1328 | return -EALREADY; |
1329 | ||
84fa4f43 JB |
1330 | return 0; |
1331 | } | |
1332 | ||
1333 | return -EINVAL; | |
1334 | } | |
1335 | ||
b2e253cf LR |
1336 | static void reg_set_request_processed(void) |
1337 | { | |
1338 | bool need_more_processing = false; | |
1339 | ||
1340 | last_request->processed = true; | |
1341 | ||
1342 | spin_lock(®_requests_lock); | |
1343 | if (!list_empty(®_requests_list)) | |
1344 | need_more_processing = true; | |
1345 | spin_unlock(®_requests_lock); | |
1346 | ||
a90c7a31 LR |
1347 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) |
1348 | cancel_delayed_work_sync(®_timeout); | |
1349 | ||
b2e253cf LR |
1350 | if (need_more_processing) |
1351 | schedule_work(®_work); | |
1352 | } | |
1353 | ||
d1c96a9a LR |
1354 | /** |
1355 | * __regulatory_hint - hint to the wireless core a regulatory domain | |
1356 | * @wiphy: if the hint comes from country information from an AP, this | |
1357 | * is required to be set to the wiphy that received the information | |
28da32d7 | 1358 | * @pending_request: the regulatory request currently being processed |
d1c96a9a LR |
1359 | * |
1360 | * The Wireless subsystem can use this function to hint to the wireless core | |
28da32d7 | 1361 | * what it believes should be the current regulatory domain. |
d1c96a9a LR |
1362 | * |
1363 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1364 | * already been set or other standard error codes. | |
1365 | * | |
abc7381b | 1366 | * Caller must hold &cfg80211_mutex and ®_mutex |
d1c96a9a | 1367 | */ |
28da32d7 LR |
1368 | static int __regulatory_hint(struct wiphy *wiphy, |
1369 | struct regulatory_request *pending_request) | |
b2e1b302 | 1370 | { |
9c96477d | 1371 | bool intersect = false; |
b2e1b302 LR |
1372 | int r = 0; |
1373 | ||
761cf7ec LR |
1374 | assert_cfg80211_lock(); |
1375 | ||
2f92cd2e | 1376 | r = ignore_request(wiphy, pending_request); |
9c96477d | 1377 | |
3e0c3ff3 | 1378 | if (r == REG_INTERSECT) { |
7db90f4a LR |
1379 | if (pending_request->initiator == |
1380 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1381 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1382 | if (r) { |
1383 | kfree(pending_request); | |
3e0c3ff3 | 1384 | return r; |
d951c1dd | 1385 | } |
3e0c3ff3 | 1386 | } |
9c96477d | 1387 | intersect = true; |
3e0c3ff3 | 1388 | } else if (r) { |
fb1fc7ad LR |
1389 | /* |
1390 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1391 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1392 | * wiphy |
1393 | */ | |
28da32d7 | 1394 | if (r == -EALREADY && |
7db90f4a LR |
1395 | pending_request->initiator == |
1396 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1397 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1398 | if (r) { |
1399 | kfree(pending_request); | |
3e0c3ff3 | 1400 | return r; |
d951c1dd | 1401 | } |
3e0c3ff3 LR |
1402 | r = -EALREADY; |
1403 | goto new_request; | |
1404 | } | |
d951c1dd | 1405 | kfree(pending_request); |
b2e1b302 | 1406 | return r; |
3e0c3ff3 | 1407 | } |
b2e1b302 | 1408 | |
3e0c3ff3 | 1409 | new_request: |
d951c1dd | 1410 | kfree(last_request); |
5203cdb6 | 1411 | |
d951c1dd LR |
1412 | last_request = pending_request; |
1413 | last_request->intersect = intersect; | |
5203cdb6 | 1414 | |
d951c1dd | 1415 | pending_request = NULL; |
3e0c3ff3 | 1416 | |
09d989d1 LR |
1417 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) { |
1418 | user_alpha2[0] = last_request->alpha2[0]; | |
1419 | user_alpha2[1] = last_request->alpha2[1]; | |
1420 | } | |
1421 | ||
3e0c3ff3 | 1422 | /* When r == REG_INTERSECT we do need to call CRDA */ |
73d54c9e LR |
1423 | if (r < 0) { |
1424 | /* | |
1425 | * Since CRDA will not be called in this case as we already | |
1426 | * have applied the requested regulatory domain before we just | |
1427 | * inform userspace we have processed the request | |
1428 | */ | |
b2e253cf | 1429 | if (r == -EALREADY) { |
73d54c9e | 1430 | nl80211_send_reg_change_event(last_request); |
b2e253cf LR |
1431 | reg_set_request_processed(); |
1432 | } | |
3e0c3ff3 | 1433 | return r; |
73d54c9e | 1434 | } |
3e0c3ff3 | 1435 | |
d951c1dd | 1436 | return call_crda(last_request->alpha2); |
b2e1b302 LR |
1437 | } |
1438 | ||
30a548c7 | 1439 | /* This processes *all* regulatory hints */ |
d951c1dd | 1440 | static void reg_process_hint(struct regulatory_request *reg_request) |
fe33eb39 LR |
1441 | { |
1442 | int r = 0; | |
1443 | struct wiphy *wiphy = NULL; | |
c4c32294 | 1444 | enum nl80211_reg_initiator initiator = reg_request->initiator; |
fe33eb39 LR |
1445 | |
1446 | BUG_ON(!reg_request->alpha2); | |
1447 | ||
fe33eb39 LR |
1448 | if (wiphy_idx_valid(reg_request->wiphy_idx)) |
1449 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1450 | ||
7db90f4a | 1451 | if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
fe33eb39 | 1452 | !wiphy) { |
d951c1dd | 1453 | kfree(reg_request); |
b0e2880b | 1454 | return; |
fe33eb39 LR |
1455 | } |
1456 | ||
28da32d7 | 1457 | r = __regulatory_hint(wiphy, reg_request); |
fe33eb39 | 1458 | /* This is required so that the orig_* parameters are saved */ |
5be83de5 | 1459 | if (r == -EALREADY && wiphy && |
a90c7a31 | 1460 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
c4c32294 | 1461 | wiphy_update_regulatory(wiphy, initiator); |
a90c7a31 LR |
1462 | return; |
1463 | } | |
1464 | ||
1465 | /* | |
1466 | * We only time out user hints, given that they should be the only | |
1467 | * source of bogus requests. | |
1468 | */ | |
c989bb15 LR |
1469 | if (r != -EALREADY && |
1470 | reg_request->initiator == NL80211_REGDOM_SET_BY_USER) | |
a90c7a31 | 1471 | schedule_delayed_work(®_timeout, msecs_to_jiffies(3142)); |
fe33eb39 LR |
1472 | } |
1473 | ||
b2e253cf LR |
1474 | /* |
1475 | * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* | |
1476 | * Regulatory hints come on a first come first serve basis and we | |
1477 | * must process each one atomically. | |
1478 | */ | |
fe33eb39 | 1479 | static void reg_process_pending_hints(void) |
b0e2880b | 1480 | { |
fe33eb39 | 1481 | struct regulatory_request *reg_request; |
fe33eb39 | 1482 | |
b0e2880b LR |
1483 | mutex_lock(&cfg80211_mutex); |
1484 | mutex_lock(®_mutex); | |
1485 | ||
b2e253cf LR |
1486 | /* When last_request->processed becomes true this will be rescheduled */ |
1487 | if (last_request && !last_request->processed) { | |
1488 | REG_DBG_PRINT("Pending regulatory request, waiting " | |
12c5ffb5 | 1489 | "for it to be processed...\n"); |
b2e253cf LR |
1490 | goto out; |
1491 | } | |
1492 | ||
fe33eb39 | 1493 | spin_lock(®_requests_lock); |
fe33eb39 | 1494 | |
b2e253cf | 1495 | if (list_empty(®_requests_list)) { |
d951c1dd | 1496 | spin_unlock(®_requests_lock); |
b2e253cf | 1497 | goto out; |
fe33eb39 | 1498 | } |
b2e253cf LR |
1499 | |
1500 | reg_request = list_first_entry(®_requests_list, | |
1501 | struct regulatory_request, | |
1502 | list); | |
1503 | list_del_init(®_request->list); | |
1504 | ||
fe33eb39 | 1505 | spin_unlock(®_requests_lock); |
b0e2880b | 1506 | |
b2e253cf LR |
1507 | reg_process_hint(reg_request); |
1508 | ||
1509 | out: | |
b0e2880b LR |
1510 | mutex_unlock(®_mutex); |
1511 | mutex_unlock(&cfg80211_mutex); | |
fe33eb39 LR |
1512 | } |
1513 | ||
e38f8a7a LR |
1514 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1515 | static void reg_process_pending_beacon_hints(void) | |
1516 | { | |
79c97e97 | 1517 | struct cfg80211_registered_device *rdev; |
e38f8a7a LR |
1518 | struct reg_beacon *pending_beacon, *tmp; |
1519 | ||
abc7381b LR |
1520 | /* |
1521 | * No need to hold the reg_mutex here as we just touch wiphys | |
1522 | * and do not read or access regulatory variables. | |
1523 | */ | |
e38f8a7a LR |
1524 | mutex_lock(&cfg80211_mutex); |
1525 | ||
1526 | /* This goes through the _pending_ beacon list */ | |
1527 | spin_lock_bh(®_pending_beacons_lock); | |
1528 | ||
1529 | if (list_empty(®_pending_beacons)) { | |
1530 | spin_unlock_bh(®_pending_beacons_lock); | |
1531 | goto out; | |
1532 | } | |
1533 | ||
1534 | list_for_each_entry_safe(pending_beacon, tmp, | |
1535 | ®_pending_beacons, list) { | |
1536 | ||
1537 | list_del_init(&pending_beacon->list); | |
1538 | ||
1539 | /* Applies the beacon hint to current wiphys */ | |
79c97e97 JB |
1540 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1541 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); | |
e38f8a7a LR |
1542 | |
1543 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
1544 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
1545 | } | |
1546 | ||
1547 | spin_unlock_bh(®_pending_beacons_lock); | |
1548 | out: | |
1549 | mutex_unlock(&cfg80211_mutex); | |
1550 | } | |
1551 | ||
fe33eb39 LR |
1552 | static void reg_todo(struct work_struct *work) |
1553 | { | |
1554 | reg_process_pending_hints(); | |
e38f8a7a | 1555 | reg_process_pending_beacon_hints(); |
fe33eb39 LR |
1556 | } |
1557 | ||
fe33eb39 LR |
1558 | static void queue_regulatory_request(struct regulatory_request *request) |
1559 | { | |
c61029c7 JL |
1560 | if (isalpha(request->alpha2[0])) |
1561 | request->alpha2[0] = toupper(request->alpha2[0]); | |
1562 | if (isalpha(request->alpha2[1])) | |
1563 | request->alpha2[1] = toupper(request->alpha2[1]); | |
1564 | ||
fe33eb39 LR |
1565 | spin_lock(®_requests_lock); |
1566 | list_add_tail(&request->list, ®_requests_list); | |
1567 | spin_unlock(®_requests_lock); | |
1568 | ||
1569 | schedule_work(®_work); | |
1570 | } | |
1571 | ||
09d989d1 LR |
1572 | /* |
1573 | * Core regulatory hint -- happens during cfg80211_init() | |
1574 | * and when we restore regulatory settings. | |
1575 | */ | |
ba25c141 LR |
1576 | static int regulatory_hint_core(const char *alpha2) |
1577 | { | |
1578 | struct regulatory_request *request; | |
1579 | ||
09d989d1 LR |
1580 | kfree(last_request); |
1581 | last_request = NULL; | |
ba25c141 LR |
1582 | |
1583 | request = kzalloc(sizeof(struct regulatory_request), | |
1584 | GFP_KERNEL); | |
1585 | if (!request) | |
1586 | return -ENOMEM; | |
1587 | ||
1588 | request->alpha2[0] = alpha2[0]; | |
1589 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1590 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
ba25c141 | 1591 | |
31e99729 | 1592 | queue_regulatory_request(request); |
5078b2e3 | 1593 | |
fe33eb39 | 1594 | return 0; |
ba25c141 LR |
1595 | } |
1596 | ||
fe33eb39 LR |
1597 | /* User hints */ |
1598 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1599 | { |
fe33eb39 LR |
1600 | struct regulatory_request *request; |
1601 | ||
be3d4810 | 1602 | BUG_ON(!alpha2); |
b2e1b302 | 1603 | |
fe33eb39 LR |
1604 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1605 | if (!request) | |
1606 | return -ENOMEM; | |
1607 | ||
1608 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1609 | request->alpha2[0] = alpha2[0]; | |
1610 | request->alpha2[1] = alpha2[1]; | |
e12822e1 | 1611 | request->initiator = NL80211_REGDOM_SET_BY_USER; |
fe33eb39 LR |
1612 | |
1613 | queue_regulatory_request(request); | |
1614 | ||
1615 | return 0; | |
1616 | } | |
1617 | ||
1618 | /* Driver hints */ | |
1619 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1620 | { | |
1621 | struct regulatory_request *request; | |
1622 | ||
1623 | BUG_ON(!alpha2); | |
1624 | BUG_ON(!wiphy); | |
1625 | ||
1626 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1627 | if (!request) | |
1628 | return -ENOMEM; | |
1629 | ||
1630 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1631 | ||
1632 | /* Must have registered wiphy first */ | |
1633 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1634 | ||
1635 | request->alpha2[0] = alpha2[0]; | |
1636 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1637 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
fe33eb39 LR |
1638 | |
1639 | queue_regulatory_request(request); | |
1640 | ||
1641 | return 0; | |
b2e1b302 LR |
1642 | } |
1643 | EXPORT_SYMBOL(regulatory_hint); | |
1644 | ||
4b44c8bc LR |
1645 | /* |
1646 | * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and | |
1647 | * therefore cannot iterate over the rdev list here. | |
1648 | */ | |
3f2355cb | 1649 | void regulatory_hint_11d(struct wiphy *wiphy, |
84920e3e LR |
1650 | enum ieee80211_band band, |
1651 | u8 *country_ie, | |
1652 | u8 country_ie_len) | |
3f2355cb | 1653 | { |
3f2355cb | 1654 | char alpha2[2]; |
3f2355cb | 1655 | enum environment_cap env = ENVIRON_ANY; |
fe33eb39 | 1656 | struct regulatory_request *request; |
3f2355cb | 1657 | |
abc7381b | 1658 | mutex_lock(®_mutex); |
3f2355cb | 1659 | |
9828b017 LR |
1660 | if (unlikely(!last_request)) |
1661 | goto out; | |
d335fe63 | 1662 | |
3f2355cb LR |
1663 | /* IE len must be evenly divisible by 2 */ |
1664 | if (country_ie_len & 0x01) | |
1665 | goto out; | |
1666 | ||
1667 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1668 | goto out; | |
1669 | ||
3f2355cb LR |
1670 | alpha2[0] = country_ie[0]; |
1671 | alpha2[1] = country_ie[1]; | |
1672 | ||
1673 | if (country_ie[2] == 'I') | |
1674 | env = ENVIRON_INDOOR; | |
1675 | else if (country_ie[2] == 'O') | |
1676 | env = ENVIRON_OUTDOOR; | |
1677 | ||
fb1fc7ad | 1678 | /* |
8b19e6ca | 1679 | * We will run this only upon a successful connection on cfg80211. |
4b44c8bc LR |
1680 | * We leave conflict resolution to the workqueue, where can hold |
1681 | * cfg80211_mutex. | |
fb1fc7ad | 1682 | */ |
cc0b6fe8 LR |
1683 | if (likely(last_request->initiator == |
1684 | NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
4b44c8bc LR |
1685 | wiphy_idx_valid(last_request->wiphy_idx))) |
1686 | goto out; | |
3f2355cb | 1687 | |
fe33eb39 LR |
1688 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1689 | if (!request) | |
f9f9b6e3 | 1690 | goto out; |
fe33eb39 | 1691 | |
fe33eb39 | 1692 | request->wiphy_idx = get_wiphy_idx(wiphy); |
4f366c5d JL |
1693 | request->alpha2[0] = alpha2[0]; |
1694 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1695 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
fe33eb39 LR |
1696 | request->country_ie_env = env; |
1697 | ||
abc7381b | 1698 | mutex_unlock(®_mutex); |
3f2355cb | 1699 | |
fe33eb39 LR |
1700 | queue_regulatory_request(request); |
1701 | ||
1702 | return; | |
0441d6ff | 1703 | |
3f2355cb | 1704 | out: |
abc7381b | 1705 | mutex_unlock(®_mutex); |
3f2355cb | 1706 | } |
b2e1b302 | 1707 | |
09d989d1 LR |
1708 | static void restore_alpha2(char *alpha2, bool reset_user) |
1709 | { | |
1710 | /* indicates there is no alpha2 to consider for restoration */ | |
1711 | alpha2[0] = '9'; | |
1712 | alpha2[1] = '7'; | |
1713 | ||
1714 | /* The user setting has precedence over the module parameter */ | |
1715 | if (is_user_regdom_saved()) { | |
1716 | /* Unless we're asked to ignore it and reset it */ | |
1717 | if (reset_user) { | |
d91e41b6 | 1718 | REG_DBG_PRINT("Restoring regulatory settings " |
09d989d1 LR |
1719 | "including user preference\n"); |
1720 | user_alpha2[0] = '9'; | |
1721 | user_alpha2[1] = '7'; | |
1722 | ||
1723 | /* | |
1724 | * If we're ignoring user settings, we still need to | |
1725 | * check the module parameter to ensure we put things | |
1726 | * back as they were for a full restore. | |
1727 | */ | |
1728 | if (!is_world_regdom(ieee80211_regdom)) { | |
d91e41b6 | 1729 | REG_DBG_PRINT("Keeping preference on " |
09d989d1 LR |
1730 | "module parameter ieee80211_regdom: %c%c\n", |
1731 | ieee80211_regdom[0], | |
1732 | ieee80211_regdom[1]); | |
1733 | alpha2[0] = ieee80211_regdom[0]; | |
1734 | alpha2[1] = ieee80211_regdom[1]; | |
1735 | } | |
1736 | } else { | |
d91e41b6 | 1737 | REG_DBG_PRINT("Restoring regulatory settings " |
09d989d1 LR |
1738 | "while preserving user preference for: %c%c\n", |
1739 | user_alpha2[0], | |
1740 | user_alpha2[1]); | |
1741 | alpha2[0] = user_alpha2[0]; | |
1742 | alpha2[1] = user_alpha2[1]; | |
1743 | } | |
1744 | } else if (!is_world_regdom(ieee80211_regdom)) { | |
d91e41b6 | 1745 | REG_DBG_PRINT("Keeping preference on " |
09d989d1 LR |
1746 | "module parameter ieee80211_regdom: %c%c\n", |
1747 | ieee80211_regdom[0], | |
1748 | ieee80211_regdom[1]); | |
1749 | alpha2[0] = ieee80211_regdom[0]; | |
1750 | alpha2[1] = ieee80211_regdom[1]; | |
1751 | } else | |
d91e41b6 | 1752 | REG_DBG_PRINT("Restoring regulatory settings\n"); |
09d989d1 LR |
1753 | } |
1754 | ||
1755 | /* | |
1756 | * Restoring regulatory settings involves ingoring any | |
1757 | * possibly stale country IE information and user regulatory | |
1758 | * settings if so desired, this includes any beacon hints | |
1759 | * learned as we could have traveled outside to another country | |
1760 | * after disconnection. To restore regulatory settings we do | |
1761 | * exactly what we did at bootup: | |
1762 | * | |
1763 | * - send a core regulatory hint | |
1764 | * - send a user regulatory hint if applicable | |
1765 | * | |
1766 | * Device drivers that send a regulatory hint for a specific country | |
1767 | * keep their own regulatory domain on wiphy->regd so that does does | |
1768 | * not need to be remembered. | |
1769 | */ | |
1770 | static void restore_regulatory_settings(bool reset_user) | |
1771 | { | |
1772 | char alpha2[2]; | |
1773 | struct reg_beacon *reg_beacon, *btmp; | |
14609555 LR |
1774 | struct regulatory_request *reg_request, *tmp; |
1775 | LIST_HEAD(tmp_reg_req_list); | |
09d989d1 LR |
1776 | |
1777 | mutex_lock(&cfg80211_mutex); | |
1778 | mutex_lock(®_mutex); | |
1779 | ||
1780 | reset_regdomains(); | |
1781 | restore_alpha2(alpha2, reset_user); | |
1782 | ||
14609555 LR |
1783 | /* |
1784 | * If there's any pending requests we simply | |
1785 | * stash them to a temporary pending queue and | |
1786 | * add then after we've restored regulatory | |
1787 | * settings. | |
1788 | */ | |
1789 | spin_lock(®_requests_lock); | |
1790 | if (!list_empty(®_requests_list)) { | |
1791 | list_for_each_entry_safe(reg_request, tmp, | |
1792 | ®_requests_list, list) { | |
1793 | if (reg_request->initiator != | |
1794 | NL80211_REGDOM_SET_BY_USER) | |
1795 | continue; | |
1796 | list_del(®_request->list); | |
1797 | list_add_tail(®_request->list, &tmp_reg_req_list); | |
1798 | } | |
1799 | } | |
1800 | spin_unlock(®_requests_lock); | |
1801 | ||
09d989d1 LR |
1802 | /* Clear beacon hints */ |
1803 | spin_lock_bh(®_pending_beacons_lock); | |
1804 | if (!list_empty(®_pending_beacons)) { | |
1805 | list_for_each_entry_safe(reg_beacon, btmp, | |
1806 | ®_pending_beacons, list) { | |
1807 | list_del(®_beacon->list); | |
1808 | kfree(reg_beacon); | |
1809 | } | |
1810 | } | |
1811 | spin_unlock_bh(®_pending_beacons_lock); | |
1812 | ||
1813 | if (!list_empty(®_beacon_list)) { | |
1814 | list_for_each_entry_safe(reg_beacon, btmp, | |
1815 | ®_beacon_list, list) { | |
1816 | list_del(®_beacon->list); | |
1817 | kfree(reg_beacon); | |
1818 | } | |
1819 | } | |
1820 | ||
1821 | /* First restore to the basic regulatory settings */ | |
1822 | cfg80211_regdomain = cfg80211_world_regdom; | |
1823 | ||
1824 | mutex_unlock(®_mutex); | |
1825 | mutex_unlock(&cfg80211_mutex); | |
1826 | ||
1827 | regulatory_hint_core(cfg80211_regdomain->alpha2); | |
1828 | ||
1829 | /* | |
1830 | * This restores the ieee80211_regdom module parameter | |
1831 | * preference or the last user requested regulatory | |
1832 | * settings, user regulatory settings takes precedence. | |
1833 | */ | |
1834 | if (is_an_alpha2(alpha2)) | |
1835 | regulatory_hint_user(user_alpha2); | |
09d989d1 | 1836 | |
14609555 LR |
1837 | if (list_empty(&tmp_reg_req_list)) |
1838 | return; | |
1839 | ||
1840 | mutex_lock(&cfg80211_mutex); | |
1841 | mutex_lock(®_mutex); | |
1842 | ||
1843 | spin_lock(®_requests_lock); | |
1844 | list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) { | |
1845 | REG_DBG_PRINT("Adding request for country %c%c back " | |
1846 | "into the queue\n", | |
1847 | reg_request->alpha2[0], | |
1848 | reg_request->alpha2[1]); | |
1849 | list_del(®_request->list); | |
1850 | list_add_tail(®_request->list, ®_requests_list); | |
1851 | } | |
1852 | spin_unlock(®_requests_lock); | |
1853 | ||
1854 | mutex_unlock(®_mutex); | |
1855 | mutex_unlock(&cfg80211_mutex); | |
1856 | ||
1857 | REG_DBG_PRINT("Kicking the queue\n"); | |
1858 | ||
1859 | schedule_work(®_work); | |
1860 | } | |
09d989d1 LR |
1861 | |
1862 | void regulatory_hint_disconnect(void) | |
1863 | { | |
d91e41b6 | 1864 | REG_DBG_PRINT("All devices are disconnected, going to " |
09d989d1 LR |
1865 | "restore regulatory settings\n"); |
1866 | restore_regulatory_settings(false); | |
1867 | } | |
1868 | ||
e38f8a7a LR |
1869 | static bool freq_is_chan_12_13_14(u16 freq) |
1870 | { | |
59eb21a6 BR |
1871 | if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) || |
1872 | freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) || | |
1873 | freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ)) | |
e38f8a7a LR |
1874 | return true; |
1875 | return false; | |
1876 | } | |
1877 | ||
1878 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
1879 | struct ieee80211_channel *beacon_chan, | |
1880 | gfp_t gfp) | |
1881 | { | |
1882 | struct reg_beacon *reg_beacon; | |
1883 | ||
1884 | if (likely((beacon_chan->beacon_found || | |
1885 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || | |
1886 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
1887 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) | |
1888 | return 0; | |
1889 | ||
1890 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
1891 | if (!reg_beacon) | |
1892 | return -ENOMEM; | |
1893 | ||
d91e41b6 | 1894 | REG_DBG_PRINT("Found new beacon on " |
4113f751 LR |
1895 | "frequency: %d MHz (Ch %d) on %s\n", |
1896 | beacon_chan->center_freq, | |
1897 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
1898 | wiphy_name(wiphy)); | |
1899 | ||
e38f8a7a LR |
1900 | memcpy(®_beacon->chan, beacon_chan, |
1901 | sizeof(struct ieee80211_channel)); | |
1902 | ||
1903 | ||
1904 | /* | |
1905 | * Since we can be called from BH or and non-BH context | |
1906 | * we must use spin_lock_bh() | |
1907 | */ | |
1908 | spin_lock_bh(®_pending_beacons_lock); | |
1909 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
1910 | spin_unlock_bh(®_pending_beacons_lock); | |
1911 | ||
1912 | schedule_work(®_work); | |
1913 | ||
1914 | return 0; | |
1915 | } | |
1916 | ||
a3d2eaf0 | 1917 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1918 | { |
1919 | unsigned int i; | |
a3d2eaf0 JB |
1920 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1921 | const struct ieee80211_freq_range *freq_range = NULL; | |
1922 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 | 1923 | |
e9c0268f | 1924 | pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n"); |
b2e1b302 LR |
1925 | |
1926 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1927 | reg_rule = &rd->reg_rules[i]; | |
1928 | freq_range = ®_rule->freq_range; | |
1929 | power_rule = ®_rule->power_rule; | |
1930 | ||
fb1fc7ad LR |
1931 | /* |
1932 | * There may not be documentation for max antenna gain | |
1933 | * in certain regions | |
1934 | */ | |
b2e1b302 | 1935 | if (power_rule->max_antenna_gain) |
e9c0268f | 1936 | pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n", |
b2e1b302 LR |
1937 | freq_range->start_freq_khz, |
1938 | freq_range->end_freq_khz, | |
1939 | freq_range->max_bandwidth_khz, | |
1940 | power_rule->max_antenna_gain, | |
1941 | power_rule->max_eirp); | |
1942 | else | |
e9c0268f | 1943 | pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n", |
b2e1b302 LR |
1944 | freq_range->start_freq_khz, |
1945 | freq_range->end_freq_khz, | |
1946 | freq_range->max_bandwidth_khz, | |
1947 | power_rule->max_eirp); | |
1948 | } | |
1949 | } | |
1950 | ||
a3d2eaf0 | 1951 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1952 | { |
1953 | ||
3f2355cb | 1954 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 1955 | |
7db90f4a LR |
1956 | if (last_request->initiator == |
1957 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
79c97e97 JB |
1958 | struct cfg80211_registered_device *rdev; |
1959 | rdev = cfg80211_rdev_by_wiphy_idx( | |
806a9e39 | 1960 | last_request->wiphy_idx); |
79c97e97 | 1961 | if (rdev) { |
e9c0268f | 1962 | pr_info("Current regulatory domain updated by AP to: %c%c\n", |
79c97e97 JB |
1963 | rdev->country_ie_alpha2[0], |
1964 | rdev->country_ie_alpha2[1]); | |
3f2355cb | 1965 | } else |
e9c0268f | 1966 | pr_info("Current regulatory domain intersected:\n"); |
3f2355cb | 1967 | } else |
e9c0268f | 1968 | pr_info("Current regulatory domain intersected:\n"); |
3f2355cb | 1969 | } else if (is_world_regdom(rd->alpha2)) |
e9c0268f | 1970 | pr_info("World regulatory domain updated:\n"); |
b2e1b302 LR |
1971 | else { |
1972 | if (is_unknown_alpha2(rd->alpha2)) | |
e9c0268f | 1973 | pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n"); |
b2e1b302 | 1974 | else |
e9c0268f | 1975 | pr_info("Regulatory domain changed to country: %c%c\n", |
b2e1b302 LR |
1976 | rd->alpha2[0], rd->alpha2[1]); |
1977 | } | |
1978 | print_rd_rules(rd); | |
1979 | } | |
1980 | ||
2df78167 | 1981 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1982 | { |
e9c0268f | 1983 | pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]); |
b2e1b302 LR |
1984 | print_rd_rules(rd); |
1985 | } | |
1986 | ||
d2372b31 | 1987 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1988 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1989 | { |
9c96477d | 1990 | const struct ieee80211_regdomain *intersected_rd = NULL; |
79c97e97 | 1991 | struct cfg80211_registered_device *rdev = NULL; |
806a9e39 | 1992 | struct wiphy *request_wiphy; |
b2e1b302 LR |
1993 | /* Some basic sanity checks first */ |
1994 | ||
b2e1b302 | 1995 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1996 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1997 | return -EINVAL; |
1998 | update_world_regdomain(rd); | |
1999 | return 0; | |
2000 | } | |
b2e1b302 LR |
2001 | |
2002 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
2003 | !is_unknown_alpha2(rd->alpha2)) | |
2004 | return -EINVAL; | |
2005 | ||
f6037d09 | 2006 | if (!last_request) |
b2e1b302 LR |
2007 | return -EINVAL; |
2008 | ||
fb1fc7ad LR |
2009 | /* |
2010 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 2011 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
2012 | * and the pending request came in from a country IE |
2013 | */ | |
7db90f4a | 2014 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
2015 | /* |
2016 | * If someone else asked us to change the rd lets only bother | |
2017 | * checking if the alpha2 changes if CRDA was already called | |
2018 | */ | |
baeb66fe | 2019 | if (!regdom_changes(rd->alpha2)) |
3f2355cb LR |
2020 | return -EINVAL; |
2021 | } | |
2022 | ||
fb1fc7ad LR |
2023 | /* |
2024 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
2025 | * and finally inform them of what we have done, in case they want |
2026 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
2027 | * internal EEPROM data |
2028 | */ | |
b2e1b302 | 2029 | |
f6037d09 | 2030 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2031 | return -EINVAL; |
2032 | ||
8375af3b | 2033 | if (!is_valid_rd(rd)) { |
e9c0268f | 2034 | pr_err("Invalid regulatory domain detected:\n"); |
8375af3b LR |
2035 | print_regdomain_info(rd); |
2036 | return -EINVAL; | |
b2e1b302 LR |
2037 | } |
2038 | ||
806a9e39 LR |
2039 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
2040 | ||
b8295acd | 2041 | if (!last_request->intersect) { |
3e0c3ff3 LR |
2042 | int r; |
2043 | ||
7db90f4a | 2044 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
3e0c3ff3 LR |
2045 | reset_regdomains(); |
2046 | cfg80211_regdomain = rd; | |
2047 | return 0; | |
2048 | } | |
2049 | ||
fb1fc7ad LR |
2050 | /* |
2051 | * For a driver hint, lets copy the regulatory domain the | |
2052 | * driver wanted to the wiphy to deal with conflicts | |
2053 | */ | |
3e0c3ff3 | 2054 | |
558f6d32 LR |
2055 | /* |
2056 | * Userspace could have sent two replies with only | |
2057 | * one kernel request. | |
2058 | */ | |
2059 | if (request_wiphy->regd) | |
2060 | return -EALREADY; | |
3e0c3ff3 | 2061 | |
806a9e39 | 2062 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
2063 | if (r) |
2064 | return r; | |
2065 | ||
b8295acd LR |
2066 | reset_regdomains(); |
2067 | cfg80211_regdomain = rd; | |
2068 | return 0; | |
2069 | } | |
2070 | ||
2071 | /* Intersection requires a bit more work */ | |
2072 | ||
7db90f4a | 2073 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 2074 | |
9c96477d LR |
2075 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
2076 | if (!intersected_rd) | |
2077 | return -EINVAL; | |
b8295acd | 2078 | |
fb1fc7ad LR |
2079 | /* |
2080 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 2081 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
2082 | * domain we keep it for its private use |
2083 | */ | |
7db90f4a | 2084 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 2085 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
2086 | else |
2087 | kfree(rd); | |
2088 | ||
b8295acd LR |
2089 | rd = NULL; |
2090 | ||
2091 | reset_regdomains(); | |
2092 | cfg80211_regdomain = intersected_rd; | |
2093 | ||
2094 | return 0; | |
9c96477d LR |
2095 | } |
2096 | ||
3f2355cb LR |
2097 | if (!intersected_rd) |
2098 | return -EINVAL; | |
2099 | ||
79c97e97 | 2100 | rdev = wiphy_to_dev(request_wiphy); |
3f2355cb | 2101 | |
79c97e97 JB |
2102 | rdev->country_ie_alpha2[0] = rd->alpha2[0]; |
2103 | rdev->country_ie_alpha2[1] = rd->alpha2[1]; | |
2104 | rdev->env = last_request->country_ie_env; | |
3f2355cb LR |
2105 | |
2106 | BUG_ON(intersected_rd == rd); | |
2107 | ||
2108 | kfree(rd); | |
2109 | rd = NULL; | |
2110 | ||
b8295acd | 2111 | reset_regdomains(); |
3f2355cb | 2112 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2113 | |
2114 | return 0; | |
2115 | } | |
2116 | ||
2117 | ||
fb1fc7ad LR |
2118 | /* |
2119 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2120 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2121 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2122 | */ | |
a3d2eaf0 | 2123 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2124 | { |
b2e1b302 LR |
2125 | int r; |
2126 | ||
761cf7ec LR |
2127 | assert_cfg80211_lock(); |
2128 | ||
abc7381b LR |
2129 | mutex_lock(®_mutex); |
2130 | ||
b2e1b302 LR |
2131 | /* Note that this doesn't update the wiphys, this is done below */ |
2132 | r = __set_regdom(rd); | |
d2372b31 JB |
2133 | if (r) { |
2134 | kfree(rd); | |
abc7381b | 2135 | mutex_unlock(®_mutex); |
b2e1b302 | 2136 | return r; |
d2372b31 | 2137 | } |
b2e1b302 | 2138 | |
b2e1b302 | 2139 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2140 | if (!last_request->intersect) |
2141 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2142 | |
2143 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2144 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2145 | |
a01ddafd | 2146 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2147 | |
73d54c9e LR |
2148 | nl80211_send_reg_change_event(last_request); |
2149 | ||
b2e253cf LR |
2150 | reg_set_request_processed(); |
2151 | ||
abc7381b LR |
2152 | mutex_unlock(®_mutex); |
2153 | ||
b2e1b302 LR |
2154 | return r; |
2155 | } | |
2156 | ||
4d9d88d1 SJR |
2157 | #ifdef CONFIG_HOTPLUG |
2158 | int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
2159 | { | |
2160 | if (last_request && !last_request->processed) { | |
2161 | if (add_uevent_var(env, "COUNTRY=%c%c", | |
2162 | last_request->alpha2[0], | |
2163 | last_request->alpha2[1])) | |
2164 | return -ENOMEM; | |
2165 | } | |
2166 | ||
2167 | return 0; | |
2168 | } | |
2169 | #else | |
2170 | int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
2171 | { | |
2172 | return -ENODEV; | |
2173 | } | |
2174 | #endif /* CONFIG_HOTPLUG */ | |
2175 | ||
a1794390 | 2176 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2177 | void reg_device_remove(struct wiphy *wiphy) |
2178 | { | |
0ad8acaf | 2179 | struct wiphy *request_wiphy = NULL; |
806a9e39 | 2180 | |
761cf7ec LR |
2181 | assert_cfg80211_lock(); |
2182 | ||
abc7381b LR |
2183 | mutex_lock(®_mutex); |
2184 | ||
0ef9ccdd CW |
2185 | kfree(wiphy->regd); |
2186 | ||
0ad8acaf LR |
2187 | if (last_request) |
2188 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
806a9e39 | 2189 | |
0ef9ccdd | 2190 | if (!request_wiphy || request_wiphy != wiphy) |
abc7381b | 2191 | goto out; |
0ef9ccdd | 2192 | |
806a9e39 | 2193 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb | 2194 | last_request->country_ie_env = ENVIRON_ANY; |
abc7381b LR |
2195 | out: |
2196 | mutex_unlock(®_mutex); | |
3f2355cb LR |
2197 | } |
2198 | ||
a90c7a31 LR |
2199 | static void reg_timeout_work(struct work_struct *work) |
2200 | { | |
2201 | REG_DBG_PRINT("Timeout while waiting for CRDA to reply, " | |
12c5ffb5 | 2202 | "restoring regulatory settings\n"); |
a90c7a31 LR |
2203 | restore_regulatory_settings(true); |
2204 | } | |
2205 | ||
2fcc9f73 | 2206 | int __init regulatory_init(void) |
b2e1b302 | 2207 | { |
bcf4f99b | 2208 | int err = 0; |
734366de | 2209 | |
b2e1b302 LR |
2210 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2211 | if (IS_ERR(reg_pdev)) | |
2212 | return PTR_ERR(reg_pdev); | |
734366de | 2213 | |
4d9d88d1 SJR |
2214 | reg_pdev->dev.type = ®_device_type; |
2215 | ||
fe33eb39 | 2216 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2217 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2218 | |
a3d2eaf0 | 2219 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2220 | |
09d989d1 LR |
2221 | user_alpha2[0] = '9'; |
2222 | user_alpha2[1] = '7'; | |
2223 | ||
ae9e4b0d LR |
2224 | /* We always try to get an update for the static regdomain */ |
2225 | err = regulatory_hint_core(cfg80211_regdomain->alpha2); | |
ba25c141 | 2226 | if (err) { |
bcf4f99b LR |
2227 | if (err == -ENOMEM) |
2228 | return err; | |
2229 | /* | |
2230 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2231 | * memory which is handled and propagated appropriately above | |
2232 | * but it can also fail during a netlink_broadcast() or during | |
2233 | * early boot for call_usermodehelper(). For now treat these | |
2234 | * errors as non-fatal. | |
2235 | */ | |
e9c0268f | 2236 | pr_err("kobject_uevent_env() was unable to call CRDA during init\n"); |
bcf4f99b LR |
2237 | #ifdef CONFIG_CFG80211_REG_DEBUG |
2238 | /* We want to find out exactly why when debugging */ | |
2239 | WARN_ON(err); | |
734366de | 2240 | #endif |
bcf4f99b | 2241 | } |
734366de | 2242 | |
ae9e4b0d LR |
2243 | /* |
2244 | * Finally, if the user set the module parameter treat it | |
2245 | * as a user hint. | |
2246 | */ | |
2247 | if (!is_world_regdom(ieee80211_regdom)) | |
2248 | regulatory_hint_user(ieee80211_regdom); | |
2249 | ||
b2e1b302 LR |
2250 | return 0; |
2251 | } | |
2252 | ||
2fcc9f73 | 2253 | void /* __init_or_exit */ regulatory_exit(void) |
b2e1b302 | 2254 | { |
fe33eb39 | 2255 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2256 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2257 | |
2258 | cancel_work_sync(®_work); | |
a90c7a31 | 2259 | cancel_delayed_work_sync(®_timeout); |
fe33eb39 | 2260 | |
a1794390 | 2261 | mutex_lock(&cfg80211_mutex); |
abc7381b | 2262 | mutex_lock(®_mutex); |
734366de | 2263 | |
b2e1b302 | 2264 | reset_regdomains(); |
734366de | 2265 | |
f6037d09 JB |
2266 | kfree(last_request); |
2267 | ||
58ebacc6 LR |
2268 | last_request = NULL; |
2269 | dev_set_uevent_suppress(®_pdev->dev, true); | |
2270 | ||
b2e1b302 | 2271 | platform_device_unregister(reg_pdev); |
734366de | 2272 | |
e38f8a7a LR |
2273 | spin_lock_bh(®_pending_beacons_lock); |
2274 | if (!list_empty(®_pending_beacons)) { | |
2275 | list_for_each_entry_safe(reg_beacon, btmp, | |
2276 | ®_pending_beacons, list) { | |
2277 | list_del(®_beacon->list); | |
2278 | kfree(reg_beacon); | |
2279 | } | |
2280 | } | |
2281 | spin_unlock_bh(®_pending_beacons_lock); | |
2282 | ||
2283 | if (!list_empty(®_beacon_list)) { | |
2284 | list_for_each_entry_safe(reg_beacon, btmp, | |
2285 | ®_beacon_list, list) { | |
2286 | list_del(®_beacon->list); | |
2287 | kfree(reg_beacon); | |
2288 | } | |
2289 | } | |
2290 | ||
fe33eb39 LR |
2291 | spin_lock(®_requests_lock); |
2292 | if (!list_empty(®_requests_list)) { | |
2293 | list_for_each_entry_safe(reg_request, tmp, | |
2294 | ®_requests_list, list) { | |
2295 | list_del(®_request->list); | |
2296 | kfree(reg_request); | |
2297 | } | |
2298 | } | |
2299 | spin_unlock(®_requests_lock); | |
2300 | ||
abc7381b | 2301 | mutex_unlock(®_mutex); |
a1794390 | 2302 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2303 | } |