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 JB |
34 | */ |
35 | #include <linux/kernel.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
b2e1b302 LR |
37 | #include <linux/list.h> |
38 | #include <linux/random.h> | |
c61029c7 | 39 | #include <linux/ctype.h> |
b2e1b302 LR |
40 | #include <linux/nl80211.h> |
41 | #include <linux/platform_device.h> | |
b2e1b302 | 42 | #include <net/cfg80211.h> |
8318d78a | 43 | #include "core.h" |
b2e1b302 | 44 | #include "reg.h" |
3b377ea9 | 45 | #include "regdb.h" |
73d54c9e | 46 | #include "nl80211.h" |
8318d78a | 47 | |
4113f751 | 48 | #ifdef CONFIG_CFG80211_REG_DEBUG |
8271195e | 49 | #define REG_DBG_PRINT(format, args...) \ |
4113f751 | 50 | do { \ |
d91e41b6 | 51 | printk(KERN_DEBUG "cfg80211: " format , ## args); \ |
4113f751 LR |
52 | } while (0) |
53 | #else | |
8271195e | 54 | #define REG_DBG_PRINT(args...) |
4113f751 LR |
55 | #endif |
56 | ||
5166ccd2 | 57 | /* Receipt of information from last regulatory request */ |
f6037d09 | 58 | static struct regulatory_request *last_request; |
734366de | 59 | |
b2e1b302 LR |
60 | /* To trigger userspace events */ |
61 | static struct platform_device *reg_pdev; | |
8318d78a | 62 | |
fb1fc7ad LR |
63 | /* |
64 | * Central wireless core regulatory domains, we only need two, | |
734366de | 65 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
66 | * information to give us an alpha2 |
67 | */ | |
f130347c | 68 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 69 | |
abc7381b LR |
70 | /* |
71 | * Protects static reg.c components: | |
72 | * - cfg80211_world_regdom | |
73 | * - cfg80211_regdom | |
abc7381b LR |
74 | * - last_request |
75 | */ | |
670b7f11 | 76 | static DEFINE_MUTEX(reg_mutex); |
46a5ebaf JB |
77 | |
78 | static inline void assert_reg_lock(void) | |
79 | { | |
80 | lockdep_assert_held(®_mutex); | |
81 | } | |
abc7381b | 82 | |
e38f8a7a | 83 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
84 | static LIST_HEAD(reg_requests_list); |
85 | static spinlock_t reg_requests_lock; | |
86 | ||
e38f8a7a LR |
87 | /* Used to queue up beacon hints for review */ |
88 | static LIST_HEAD(reg_pending_beacons); | |
89 | static spinlock_t reg_pending_beacons_lock; | |
90 | ||
91 | /* Used to keep track of processed beacon hints */ | |
92 | static LIST_HEAD(reg_beacon_list); | |
93 | ||
94 | struct reg_beacon { | |
95 | struct list_head list; | |
96 | struct ieee80211_channel chan; | |
97 | }; | |
98 | ||
734366de JB |
99 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
100 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 101 | .n_reg_rules = 5, |
734366de JB |
102 | .alpha2 = "00", |
103 | .reg_rules = { | |
68798a62 LR |
104 | /* IEEE 802.11b/g, channels 1..11 */ |
105 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
106 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
107 | * channel fits here. */ | |
108 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
109 | NL80211_RRF_PASSIVE_SCAN | |
110 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
111 | /* IEEE 802.11 channel 14 - Only JP enables |
112 | * this and for 802.11b only */ | |
113 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
114 | NL80211_RRF_PASSIVE_SCAN | | |
115 | NL80211_RRF_NO_IBSS | | |
116 | NL80211_RRF_NO_OFDM), | |
117 | /* IEEE 802.11a, channel 36..48 */ | |
ec329ace | 118 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
119 | NL80211_RRF_PASSIVE_SCAN | |
120 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
121 | |
122 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
123 | ||
124 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 125 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
126 | NL80211_RRF_PASSIVE_SCAN | |
127 | NL80211_RRF_NO_IBSS), | |
734366de JB |
128 | } |
129 | }; | |
130 | ||
a3d2eaf0 JB |
131 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
132 | &world_regdom; | |
734366de | 133 | |
6ee7d330 | 134 | static char *ieee80211_regdom = "00"; |
09d989d1 | 135 | static char user_alpha2[2]; |
6ee7d330 | 136 | |
734366de JB |
137 | module_param(ieee80211_regdom, charp, 0444); |
138 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
139 | ||
734366de JB |
140 | static void reset_regdomains(void) |
141 | { | |
942b25cf JB |
142 | /* avoid freeing static information or freeing something twice */ |
143 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
144 | cfg80211_regdomain = NULL; | |
145 | if (cfg80211_world_regdom == &world_regdom) | |
146 | cfg80211_world_regdom = NULL; | |
147 | if (cfg80211_regdomain == &world_regdom) | |
148 | cfg80211_regdomain = NULL; | |
942b25cf JB |
149 | |
150 | kfree(cfg80211_regdomain); | |
151 | kfree(cfg80211_world_regdom); | |
734366de | 152 | |
a3d2eaf0 | 153 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
154 | cfg80211_regdomain = NULL; |
155 | } | |
156 | ||
fb1fc7ad LR |
157 | /* |
158 | * Dynamic world regulatory domain requested by the wireless | |
159 | * core upon initialization | |
160 | */ | |
a3d2eaf0 | 161 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 162 | { |
f6037d09 | 163 | BUG_ON(!last_request); |
734366de JB |
164 | |
165 | reset_regdomains(); | |
166 | ||
167 | cfg80211_world_regdom = rd; | |
168 | cfg80211_regdomain = rd; | |
169 | } | |
734366de | 170 | |
a3d2eaf0 | 171 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
172 | { |
173 | if (!alpha2) | |
174 | return false; | |
175 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
176 | return true; | |
177 | return false; | |
178 | } | |
8318d78a | 179 | |
a3d2eaf0 | 180 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
181 | { |
182 | if (!alpha2) | |
183 | return false; | |
184 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
185 | return true; | |
186 | return false; | |
187 | } | |
8318d78a | 188 | |
a3d2eaf0 | 189 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
190 | { |
191 | if (!alpha2) | |
192 | return false; | |
fb1fc7ad LR |
193 | /* |
194 | * Special case where regulatory domain was built by driver | |
195 | * but a specific alpha2 cannot be determined | |
196 | */ | |
b2e1b302 LR |
197 | if (alpha2[0] == '9' && alpha2[1] == '9') |
198 | return true; | |
199 | return false; | |
200 | } | |
8318d78a | 201 | |
3f2355cb LR |
202 | static bool is_intersected_alpha2(const char *alpha2) |
203 | { | |
204 | if (!alpha2) | |
205 | return false; | |
fb1fc7ad LR |
206 | /* |
207 | * Special case where regulatory domain is the | |
3f2355cb | 208 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
209 | * structures |
210 | */ | |
3f2355cb LR |
211 | if (alpha2[0] == '9' && alpha2[1] == '8') |
212 | return true; | |
213 | return false; | |
214 | } | |
215 | ||
a3d2eaf0 | 216 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
217 | { |
218 | if (!alpha2) | |
219 | return false; | |
c61029c7 | 220 | if (isalpha(alpha2[0]) && isalpha(alpha2[1])) |
b2e1b302 LR |
221 | return true; |
222 | return false; | |
223 | } | |
8318d78a | 224 | |
a3d2eaf0 | 225 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
226 | { |
227 | if (!alpha2_x || !alpha2_y) | |
228 | return false; | |
229 | if (alpha2_x[0] == alpha2_y[0] && | |
230 | alpha2_x[1] == alpha2_y[1]) | |
231 | return true; | |
232 | return false; | |
233 | } | |
234 | ||
69b1572b | 235 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 236 | { |
761cf7ec LR |
237 | assert_cfg80211_lock(); |
238 | ||
b2e1b302 LR |
239 | if (!cfg80211_regdomain) |
240 | return true; | |
241 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
242 | return false; | |
243 | return true; | |
244 | } | |
245 | ||
09d989d1 LR |
246 | /* |
247 | * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets | |
248 | * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER | |
249 | * has ever been issued. | |
250 | */ | |
251 | static bool is_user_regdom_saved(void) | |
252 | { | |
253 | if (user_alpha2[0] == '9' && user_alpha2[1] == '7') | |
254 | return false; | |
255 | ||
256 | /* This would indicate a mistake on the design */ | |
257 | if (WARN((!is_world_regdom(user_alpha2) && | |
258 | !is_an_alpha2(user_alpha2)), | |
259 | "Unexpected user alpha2: %c%c\n", | |
260 | user_alpha2[0], | |
261 | user_alpha2[1])) | |
262 | return false; | |
263 | ||
264 | return true; | |
265 | } | |
266 | ||
3b377ea9 JL |
267 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
268 | const struct ieee80211_regdomain *src_regd) | |
269 | { | |
270 | struct ieee80211_regdomain *regd; | |
271 | int size_of_regd = 0; | |
272 | unsigned int i; | |
273 | ||
274 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
275 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
276 | ||
277 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
278 | if (!regd) | |
279 | return -ENOMEM; | |
280 | ||
281 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
282 | ||
283 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
284 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
285 | sizeof(struct ieee80211_reg_rule)); | |
286 | ||
287 | *dst_regd = regd; | |
288 | return 0; | |
289 | } | |
290 | ||
291 | #ifdef CONFIG_CFG80211_INTERNAL_REGDB | |
292 | struct reg_regdb_search_request { | |
293 | char alpha2[2]; | |
294 | struct list_head list; | |
295 | }; | |
296 | ||
297 | static LIST_HEAD(reg_regdb_search_list); | |
368d06f5 | 298 | static DEFINE_MUTEX(reg_regdb_search_mutex); |
3b377ea9 JL |
299 | |
300 | static void reg_regdb_search(struct work_struct *work) | |
301 | { | |
302 | struct reg_regdb_search_request *request; | |
303 | const struct ieee80211_regdomain *curdom, *regdom; | |
304 | int i, r; | |
305 | ||
368d06f5 | 306 | mutex_lock(®_regdb_search_mutex); |
3b377ea9 JL |
307 | while (!list_empty(®_regdb_search_list)) { |
308 | request = list_first_entry(®_regdb_search_list, | |
309 | struct reg_regdb_search_request, | |
310 | list); | |
311 | list_del(&request->list); | |
312 | ||
313 | for (i=0; i<reg_regdb_size; i++) { | |
314 | curdom = reg_regdb[i]; | |
315 | ||
316 | if (!memcmp(request->alpha2, curdom->alpha2, 2)) { | |
317 | r = reg_copy_regd(®dom, curdom); | |
318 | if (r) | |
319 | break; | |
3b377ea9 JL |
320 | mutex_lock(&cfg80211_mutex); |
321 | set_regdom(regdom); | |
322 | mutex_unlock(&cfg80211_mutex); | |
3b377ea9 JL |
323 | break; |
324 | } | |
325 | } | |
326 | ||
327 | kfree(request); | |
328 | } | |
368d06f5 | 329 | mutex_unlock(®_regdb_search_mutex); |
3b377ea9 JL |
330 | } |
331 | ||
332 | static DECLARE_WORK(reg_regdb_work, reg_regdb_search); | |
333 | ||
334 | static void reg_regdb_query(const char *alpha2) | |
335 | { | |
336 | struct reg_regdb_search_request *request; | |
337 | ||
338 | if (!alpha2) | |
339 | return; | |
340 | ||
341 | request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL); | |
342 | if (!request) | |
343 | return; | |
344 | ||
345 | memcpy(request->alpha2, alpha2, 2); | |
346 | ||
368d06f5 | 347 | mutex_lock(®_regdb_search_mutex); |
3b377ea9 | 348 | list_add_tail(&request->list, ®_regdb_search_list); |
368d06f5 | 349 | mutex_unlock(®_regdb_search_mutex); |
3b377ea9 JL |
350 | |
351 | schedule_work(®_regdb_work); | |
352 | } | |
353 | #else | |
354 | static inline void reg_regdb_query(const char *alpha2) {} | |
355 | #endif /* CONFIG_CFG80211_INTERNAL_REGDB */ | |
356 | ||
fb1fc7ad LR |
357 | /* |
358 | * This lets us keep regulatory code which is updated on a regulatory | |
359 | * basis in userspace. | |
360 | */ | |
b2e1b302 LR |
361 | static int call_crda(const char *alpha2) |
362 | { | |
363 | char country_env[9 + 2] = "COUNTRY="; | |
364 | char *envp[] = { | |
365 | country_env, | |
366 | NULL | |
367 | }; | |
368 | ||
369 | if (!is_world_regdom((char *) alpha2)) | |
370 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
371 | alpha2[0], alpha2[1]); | |
372 | else | |
b2e1b302 LR |
373 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
374 | "regulatory domain\n"); | |
b2e1b302 | 375 | |
3b377ea9 JL |
376 | /* query internal regulatory database (if it exists) */ |
377 | reg_regdb_query(alpha2); | |
378 | ||
b2e1b302 LR |
379 | country_env[8] = alpha2[0]; |
380 | country_env[9] = alpha2[1]; | |
381 | ||
382 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
383 | } | |
384 | ||
b2e1b302 | 385 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 386 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 387 | { |
61405e97 LR |
388 | assert_cfg80211_lock(); |
389 | ||
f6037d09 JB |
390 | if (!last_request) |
391 | return false; | |
392 | ||
393 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 394 | } |
8318d78a | 395 | |
b2e1b302 | 396 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 397 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 398 | { |
a3d2eaf0 | 399 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
400 | u32 freq_diff; |
401 | ||
91e99004 | 402 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
403 | return false; |
404 | ||
405 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
406 | return false; | |
407 | ||
408 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
409 | ||
bd05f28e RK |
410 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
411 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
412 | return false; |
413 | ||
414 | return true; | |
415 | } | |
416 | ||
a3d2eaf0 | 417 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 418 | { |
a3d2eaf0 | 419 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 420 | unsigned int i; |
8318d78a | 421 | |
b2e1b302 LR |
422 | if (!rd->n_reg_rules) |
423 | return false; | |
8318d78a | 424 | |
88dc1c3f LR |
425 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
426 | return false; | |
427 | ||
b2e1b302 LR |
428 | for (i = 0; i < rd->n_reg_rules; i++) { |
429 | reg_rule = &rd->reg_rules[i]; | |
430 | if (!is_valid_reg_rule(reg_rule)) | |
431 | return false; | |
432 | } | |
433 | ||
434 | return true; | |
8318d78a JB |
435 | } |
436 | ||
038659e7 LR |
437 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, |
438 | u32 center_freq_khz, | |
439 | u32 bw_khz) | |
b2e1b302 | 440 | { |
038659e7 LR |
441 | u32 start_freq_khz, end_freq_khz; |
442 | ||
443 | start_freq_khz = center_freq_khz - (bw_khz/2); | |
444 | end_freq_khz = center_freq_khz + (bw_khz/2); | |
445 | ||
446 | if (start_freq_khz >= freq_range->start_freq_khz && | |
447 | end_freq_khz <= freq_range->end_freq_khz) | |
448 | return true; | |
449 | ||
450 | return false; | |
b2e1b302 | 451 | } |
8318d78a | 452 | |
0c7dc45d LR |
453 | /** |
454 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
455 | * @freq_range: frequency rule we want to query | |
456 | * @freq_khz: frequency we are inquiring about | |
457 | * | |
458 | * This lets us know if a specific frequency rule is or is not relevant to | |
459 | * a specific frequency's band. Bands are device specific and artificial | |
460 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
461 | * safe for now to assume that a frequency rule should not be part of a | |
462 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
463 | * This resolution can be lowered and should be considered as we add | |
464 | * regulatory rule support for other "bands". | |
465 | **/ | |
466 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
467 | u32 freq_khz) | |
468 | { | |
469 | #define ONE_GHZ_IN_KHZ 1000000 | |
470 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
471 | return true; | |
472 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
473 | return true; | |
474 | return false; | |
475 | #undef ONE_GHZ_IN_KHZ | |
476 | } | |
477 | ||
fb1fc7ad LR |
478 | /* |
479 | * Helper for regdom_intersect(), this does the real | |
480 | * mathematical intersection fun | |
481 | */ | |
9c96477d LR |
482 | static int reg_rules_intersect( |
483 | const struct ieee80211_reg_rule *rule1, | |
484 | const struct ieee80211_reg_rule *rule2, | |
485 | struct ieee80211_reg_rule *intersected_rule) | |
486 | { | |
487 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
488 | struct ieee80211_freq_range *freq_range; | |
489 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
490 | struct ieee80211_power_rule *power_rule; | |
491 | u32 freq_diff; | |
492 | ||
493 | freq_range1 = &rule1->freq_range; | |
494 | freq_range2 = &rule2->freq_range; | |
495 | freq_range = &intersected_rule->freq_range; | |
496 | ||
497 | power_rule1 = &rule1->power_rule; | |
498 | power_rule2 = &rule2->power_rule; | |
499 | power_rule = &intersected_rule->power_rule; | |
500 | ||
501 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
502 | freq_range2->start_freq_khz); | |
503 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
504 | freq_range2->end_freq_khz); | |
505 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
506 | freq_range2->max_bandwidth_khz); | |
507 | ||
508 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
509 | if (freq_range->max_bandwidth_khz > freq_diff) | |
510 | freq_range->max_bandwidth_khz = freq_diff; | |
511 | ||
512 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
513 | power_rule2->max_eirp); | |
514 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
515 | power_rule2->max_antenna_gain); | |
516 | ||
517 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
518 | ||
519 | if (!is_valid_reg_rule(intersected_rule)) | |
520 | return -EINVAL; | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
525 | /** | |
526 | * regdom_intersect - do the intersection between two regulatory domains | |
527 | * @rd1: first regulatory domain | |
528 | * @rd2: second regulatory domain | |
529 | * | |
530 | * Use this function to get the intersection between two regulatory domains. | |
531 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
532 | * as no one single alpha2 can represent this regulatory domain. | |
533 | * | |
534 | * Returns a pointer to the regulatory domain structure which will hold the | |
535 | * resulting intersection of rules between rd1 and rd2. We will | |
536 | * kzalloc() this structure for you. | |
537 | */ | |
538 | static struct ieee80211_regdomain *regdom_intersect( | |
539 | const struct ieee80211_regdomain *rd1, | |
540 | const struct ieee80211_regdomain *rd2) | |
541 | { | |
542 | int r, size_of_regd; | |
543 | unsigned int x, y; | |
544 | unsigned int num_rules = 0, rule_idx = 0; | |
545 | const struct ieee80211_reg_rule *rule1, *rule2; | |
546 | struct ieee80211_reg_rule *intersected_rule; | |
547 | struct ieee80211_regdomain *rd; | |
548 | /* This is just a dummy holder to help us count */ | |
549 | struct ieee80211_reg_rule irule; | |
550 | ||
551 | /* Uses the stack temporarily for counter arithmetic */ | |
552 | intersected_rule = &irule; | |
553 | ||
554 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
555 | ||
556 | if (!rd1 || !rd2) | |
557 | return NULL; | |
558 | ||
fb1fc7ad LR |
559 | /* |
560 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
561 | * build them. This is to so we can malloc() and free() a |
562 | * regdomain once. The reason we use reg_rules_intersect() here | |
563 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
564 | * All rules that do check out OK are valid. |
565 | */ | |
9c96477d LR |
566 | |
567 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
568 | rule1 = &rd1->reg_rules[x]; | |
569 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
570 | rule2 = &rd2->reg_rules[y]; | |
571 | if (!reg_rules_intersect(rule1, rule2, | |
572 | intersected_rule)) | |
573 | num_rules++; | |
574 | memset(intersected_rule, 0, | |
575 | sizeof(struct ieee80211_reg_rule)); | |
576 | } | |
577 | } | |
578 | ||
579 | if (!num_rules) | |
580 | return NULL; | |
581 | ||
582 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
583 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
584 | ||
585 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
586 | if (!rd) | |
587 | return NULL; | |
588 | ||
589 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
590 | rule1 = &rd1->reg_rules[x]; | |
591 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
592 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
593 | /* |
594 | * This time around instead of using the stack lets | |
9c96477d | 595 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
596 | * a memcpy() |
597 | */ | |
9c96477d LR |
598 | intersected_rule = &rd->reg_rules[rule_idx]; |
599 | r = reg_rules_intersect(rule1, rule2, | |
600 | intersected_rule); | |
fb1fc7ad LR |
601 | /* |
602 | * No need to memset here the intersected rule here as | |
603 | * we're not using the stack anymore | |
604 | */ | |
9c96477d LR |
605 | if (r) |
606 | continue; | |
607 | rule_idx++; | |
608 | } | |
609 | } | |
610 | ||
611 | if (rule_idx != num_rules) { | |
612 | kfree(rd); | |
613 | return NULL; | |
614 | } | |
615 | ||
616 | rd->n_reg_rules = num_rules; | |
617 | rd->alpha2[0] = '9'; | |
618 | rd->alpha2[1] = '8'; | |
619 | ||
620 | return rd; | |
621 | } | |
622 | ||
fb1fc7ad LR |
623 | /* |
624 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
625 | * want to just have the channel structure use these | |
626 | */ | |
b2e1b302 LR |
627 | static u32 map_regdom_flags(u32 rd_flags) |
628 | { | |
629 | u32 channel_flags = 0; | |
630 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
631 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
632 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
633 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
634 | if (rd_flags & NL80211_RRF_DFS) | |
635 | channel_flags |= IEEE80211_CHAN_RADAR; | |
636 | return channel_flags; | |
637 | } | |
638 | ||
1fa25e41 LR |
639 | static int freq_reg_info_regd(struct wiphy *wiphy, |
640 | u32 center_freq, | |
038659e7 | 641 | u32 desired_bw_khz, |
1fa25e41 LR |
642 | const struct ieee80211_reg_rule **reg_rule, |
643 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
644 | { |
645 | int i; | |
0c7dc45d | 646 | bool band_rule_found = false; |
3e0c3ff3 | 647 | const struct ieee80211_regdomain *regd; |
038659e7 LR |
648 | bool bw_fits = false; |
649 | ||
650 | if (!desired_bw_khz) | |
651 | desired_bw_khz = MHZ_TO_KHZ(20); | |
8318d78a | 652 | |
1fa25e41 | 653 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 654 | |
fb1fc7ad LR |
655 | /* |
656 | * Follow the driver's regulatory domain, if present, unless a country | |
657 | * IE has been processed or a user wants to help complaince further | |
658 | */ | |
7db90f4a LR |
659 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
660 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && | |
3e0c3ff3 LR |
661 | wiphy->regd) |
662 | regd = wiphy->regd; | |
663 | ||
664 | if (!regd) | |
b2e1b302 LR |
665 | return -EINVAL; |
666 | ||
3e0c3ff3 | 667 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
668 | const struct ieee80211_reg_rule *rr; |
669 | const struct ieee80211_freq_range *fr = NULL; | |
670 | const struct ieee80211_power_rule *pr = NULL; | |
671 | ||
3e0c3ff3 | 672 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
673 | fr = &rr->freq_range; |
674 | pr = &rr->power_rule; | |
0c7dc45d | 675 | |
fb1fc7ad LR |
676 | /* |
677 | * We only need to know if one frequency rule was | |
0c7dc45d | 678 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
679 | * not overwrite it once found |
680 | */ | |
0c7dc45d LR |
681 | if (!band_rule_found) |
682 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
683 | ||
038659e7 LR |
684 | bw_fits = reg_does_bw_fit(fr, |
685 | center_freq, | |
686 | desired_bw_khz); | |
0c7dc45d | 687 | |
038659e7 | 688 | if (band_rule_found && bw_fits) { |
b2e1b302 | 689 | *reg_rule = rr; |
038659e7 | 690 | return 0; |
8318d78a JB |
691 | } |
692 | } | |
693 | ||
0c7dc45d LR |
694 | if (!band_rule_found) |
695 | return -ERANGE; | |
696 | ||
038659e7 | 697 | return -EINVAL; |
b2e1b302 LR |
698 | } |
699 | ||
038659e7 LR |
700 | int freq_reg_info(struct wiphy *wiphy, |
701 | u32 center_freq, | |
702 | u32 desired_bw_khz, | |
703 | const struct ieee80211_reg_rule **reg_rule) | |
1fa25e41 | 704 | { |
ac46d48e | 705 | assert_cfg80211_lock(); |
038659e7 LR |
706 | return freq_reg_info_regd(wiphy, |
707 | center_freq, | |
708 | desired_bw_khz, | |
709 | reg_rule, | |
710 | NULL); | |
1fa25e41 | 711 | } |
4f366c5d | 712 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 713 | |
926a0a09 LR |
714 | #ifdef CONFIG_CFG80211_REG_DEBUG |
715 | static const char *reg_initiator_name(enum nl80211_reg_initiator initiator) | |
716 | { | |
717 | switch (initiator) { | |
718 | case NL80211_REGDOM_SET_BY_CORE: | |
719 | return "Set by core"; | |
720 | case NL80211_REGDOM_SET_BY_USER: | |
721 | return "Set by user"; | |
722 | case NL80211_REGDOM_SET_BY_DRIVER: | |
723 | return "Set by driver"; | |
724 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
725 | return "Set by country IE"; | |
726 | default: | |
727 | WARN_ON(1); | |
728 | return "Set by bug"; | |
729 | } | |
730 | } | |
e702d3cf LR |
731 | |
732 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, | |
733 | u32 desired_bw_khz, | |
734 | const struct ieee80211_reg_rule *reg_rule) | |
735 | { | |
736 | const struct ieee80211_power_rule *power_rule; | |
737 | const struct ieee80211_freq_range *freq_range; | |
738 | char max_antenna_gain[32]; | |
739 | ||
740 | power_rule = ®_rule->power_rule; | |
741 | freq_range = ®_rule->freq_range; | |
742 | ||
743 | if (!power_rule->max_antenna_gain) | |
744 | snprintf(max_antenna_gain, 32, "N/A"); | |
745 | else | |
746 | snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain); | |
747 | ||
d91e41b6 | 748 | REG_DBG_PRINT("Updating information on frequency %d MHz " |
e702d3cf LR |
749 | "for %d a MHz width channel with regulatory rule:\n", |
750 | chan->center_freq, | |
751 | KHZ_TO_MHZ(desired_bw_khz)); | |
752 | ||
d91e41b6 | 753 | REG_DBG_PRINT("%d KHz - %d KHz @ KHz), (%s mBi, %d mBm)\n", |
e702d3cf LR |
754 | freq_range->start_freq_khz, |
755 | freq_range->end_freq_khz, | |
756 | max_antenna_gain, | |
757 | power_rule->max_eirp); | |
758 | } | |
759 | #else | |
760 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, | |
761 | u32 desired_bw_khz, | |
762 | const struct ieee80211_reg_rule *reg_rule) | |
763 | { | |
764 | return; | |
765 | } | |
926a0a09 LR |
766 | #endif |
767 | ||
038659e7 LR |
768 | /* |
769 | * Note that right now we assume the desired channel bandwidth | |
770 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz | |
771 | * per channel, the primary and the extension channel). To support | |
772 | * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a | |
773 | * new ieee80211_channel.target_bw and re run the regulatory check | |
774 | * on the wiphy with the target_bw specified. Then we can simply use | |
775 | * that below for the desired_bw_khz below. | |
776 | */ | |
7ca43d03 LR |
777 | static void handle_channel(struct wiphy *wiphy, |
778 | enum nl80211_reg_initiator initiator, | |
779 | enum ieee80211_band band, | |
a92a3ce7 | 780 | unsigned int chan_idx) |
b2e1b302 LR |
781 | { |
782 | int r; | |
038659e7 LR |
783 | u32 flags, bw_flags = 0; |
784 | u32 desired_bw_khz = MHZ_TO_KHZ(20); | |
b2e1b302 LR |
785 | const struct ieee80211_reg_rule *reg_rule = NULL; |
786 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 787 | const struct ieee80211_freq_range *freq_range = NULL; |
a92a3ce7 LR |
788 | struct ieee80211_supported_band *sband; |
789 | struct ieee80211_channel *chan; | |
fe33eb39 | 790 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 791 | |
761cf7ec LR |
792 | assert_cfg80211_lock(); |
793 | ||
806a9e39 LR |
794 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
795 | ||
a92a3ce7 LR |
796 | sband = wiphy->bands[band]; |
797 | BUG_ON(chan_idx >= sband->n_channels); | |
798 | chan = &sband->channels[chan_idx]; | |
799 | ||
800 | flags = chan->orig_flags; | |
b2e1b302 | 801 | |
038659e7 LR |
802 | r = freq_reg_info(wiphy, |
803 | MHZ_TO_KHZ(chan->center_freq), | |
804 | desired_bw_khz, | |
805 | ®_rule); | |
b2e1b302 | 806 | |
ca4ffe8f LR |
807 | if (r) { |
808 | /* | |
809 | * We will disable all channels that do not match our | |
810 | * recieved regulatory rule unless the hint is coming | |
811 | * from a Country IE and the Country IE had no information | |
812 | * about a band. The IEEE 802.11 spec allows for an AP | |
813 | * to send only a subset of the regulatory rules allowed, | |
814 | * so an AP in the US that only supports 2.4 GHz may only send | |
815 | * a country IE with information for the 2.4 GHz band | |
816 | * while 5 GHz is still supported. | |
817 | */ | |
818 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
819 | r == -ERANGE) | |
820 | return; | |
821 | ||
d91e41b6 | 822 | REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq); |
ca4ffe8f | 823 | chan->flags = IEEE80211_CHAN_DISABLED; |
8318d78a | 824 | return; |
ca4ffe8f | 825 | } |
8318d78a | 826 | |
e702d3cf LR |
827 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
828 | ||
b2e1b302 | 829 | power_rule = ®_rule->power_rule; |
038659e7 LR |
830 | freq_range = ®_rule->freq_range; |
831 | ||
832 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
833 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
b2e1b302 | 834 | |
7db90f4a | 835 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
806a9e39 | 836 | request_wiphy && request_wiphy == wiphy && |
5be83de5 | 837 | request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
fb1fc7ad LR |
838 | /* |
839 | * This gaurantees the driver's requested regulatory domain | |
f976376d | 840 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
841 | * settings |
842 | */ | |
f976376d | 843 | chan->flags = chan->orig_flags = |
038659e7 | 844 | map_regdom_flags(reg_rule->flags) | bw_flags; |
f976376d LR |
845 | chan->max_antenna_gain = chan->orig_mag = |
846 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
f976376d LR |
847 | chan->max_power = chan->orig_mpwr = |
848 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
849 | return; | |
850 | } | |
851 | ||
038659e7 | 852 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 853 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 | 854 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
253898c4 | 855 | if (chan->orig_mpwr) |
b2e1b302 LR |
856 | chan->max_power = min(chan->orig_mpwr, |
857 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 858 | else |
b2e1b302 | 859 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
860 | } |
861 | ||
7ca43d03 LR |
862 | static void handle_band(struct wiphy *wiphy, |
863 | enum ieee80211_band band, | |
864 | enum nl80211_reg_initiator initiator) | |
8318d78a | 865 | { |
a92a3ce7 LR |
866 | unsigned int i; |
867 | struct ieee80211_supported_band *sband; | |
868 | ||
869 | BUG_ON(!wiphy->bands[band]); | |
870 | sband = wiphy->bands[band]; | |
8318d78a JB |
871 | |
872 | for (i = 0; i < sband->n_channels; i++) | |
7ca43d03 | 873 | handle_channel(wiphy, initiator, band, i); |
8318d78a JB |
874 | } |
875 | ||
7db90f4a LR |
876 | static bool ignore_reg_update(struct wiphy *wiphy, |
877 | enum nl80211_reg_initiator initiator) | |
14b9815a | 878 | { |
926a0a09 | 879 | if (!last_request) { |
d91e41b6 | 880 | REG_DBG_PRINT("Ignoring regulatory request %s since " |
926a0a09 LR |
881 | "last_request is not set\n", |
882 | reg_initiator_name(initiator)); | |
14b9815a | 883 | return true; |
926a0a09 LR |
884 | } |
885 | ||
7db90f4a | 886 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
926a0a09 | 887 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { |
d91e41b6 | 888 | REG_DBG_PRINT("Ignoring regulatory request %s " |
926a0a09 LR |
889 | "since the driver uses its own custom " |
890 | "regulatory domain ", | |
891 | reg_initiator_name(initiator)); | |
14b9815a | 892 | return true; |
926a0a09 LR |
893 | } |
894 | ||
fb1fc7ad LR |
895 | /* |
896 | * wiphy->regd will be set once the device has its own | |
897 | * desired regulatory domain set | |
898 | */ | |
5be83de5 | 899 | if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && |
749b527b | 900 | initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
926a0a09 | 901 | !is_world_regdom(last_request->alpha2)) { |
d91e41b6 | 902 | REG_DBG_PRINT("Ignoring regulatory request %s " |
926a0a09 LR |
903 | "since the driver requires its own regulaotry " |
904 | "domain to be set first", | |
905 | reg_initiator_name(initiator)); | |
14b9815a | 906 | return true; |
926a0a09 LR |
907 | } |
908 | ||
14b9815a LR |
909 | return false; |
910 | } | |
911 | ||
7db90f4a | 912 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
8318d78a | 913 | { |
79c97e97 | 914 | struct cfg80211_registered_device *rdev; |
8318d78a | 915 | |
79c97e97 JB |
916 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
917 | wiphy_update_regulatory(&rdev->wiphy, initiator); | |
b2e1b302 LR |
918 | } |
919 | ||
e38f8a7a LR |
920 | static void handle_reg_beacon(struct wiphy *wiphy, |
921 | unsigned int chan_idx, | |
922 | struct reg_beacon *reg_beacon) | |
923 | { | |
e38f8a7a LR |
924 | struct ieee80211_supported_band *sband; |
925 | struct ieee80211_channel *chan; | |
6bad8766 LR |
926 | bool channel_changed = false; |
927 | struct ieee80211_channel chan_before; | |
e38f8a7a LR |
928 | |
929 | assert_cfg80211_lock(); | |
930 | ||
931 | sband = wiphy->bands[reg_beacon->chan.band]; | |
932 | chan = &sband->channels[chan_idx]; | |
933 | ||
934 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
935 | return; | |
936 | ||
6bad8766 LR |
937 | if (chan->beacon_found) |
938 | return; | |
939 | ||
940 | chan->beacon_found = true; | |
941 | ||
5be83de5 | 942 | if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) |
37184244 LR |
943 | return; |
944 | ||
6bad8766 LR |
945 | chan_before.center_freq = chan->center_freq; |
946 | chan_before.flags = chan->flags; | |
947 | ||
37184244 | 948 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { |
e38f8a7a | 949 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; |
6bad8766 | 950 | channel_changed = true; |
e38f8a7a LR |
951 | } |
952 | ||
37184244 | 953 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { |
e38f8a7a | 954 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; |
6bad8766 | 955 | channel_changed = true; |
e38f8a7a LR |
956 | } |
957 | ||
6bad8766 LR |
958 | if (channel_changed) |
959 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
e38f8a7a LR |
960 | } |
961 | ||
962 | /* | |
963 | * Called when a scan on a wiphy finds a beacon on | |
964 | * new channel | |
965 | */ | |
966 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
967 | struct reg_beacon *reg_beacon) | |
968 | { | |
969 | unsigned int i; | |
970 | struct ieee80211_supported_band *sband; | |
971 | ||
972 | assert_cfg80211_lock(); | |
973 | ||
974 | if (!wiphy->bands[reg_beacon->chan.band]) | |
975 | return; | |
976 | ||
977 | sband = wiphy->bands[reg_beacon->chan.band]; | |
978 | ||
979 | for (i = 0; i < sband->n_channels; i++) | |
980 | handle_reg_beacon(wiphy, i, reg_beacon); | |
981 | } | |
982 | ||
983 | /* | |
984 | * Called upon reg changes or a new wiphy is added | |
985 | */ | |
986 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
987 | { | |
988 | unsigned int i; | |
989 | struct ieee80211_supported_band *sband; | |
990 | struct reg_beacon *reg_beacon; | |
991 | ||
992 | assert_cfg80211_lock(); | |
993 | ||
994 | if (list_empty(®_beacon_list)) | |
995 | return; | |
996 | ||
997 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
998 | if (!wiphy->bands[reg_beacon->chan.band]) | |
999 | continue; | |
1000 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1001 | for (i = 0; i < sband->n_channels; i++) | |
1002 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1007 | { | |
1008 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1009 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1010 | return true; | |
b1ed8ddd LR |
1011 | if (last_request && |
1012 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
5be83de5 | 1013 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) |
e38f8a7a LR |
1014 | return true; |
1015 | return false; | |
1016 | } | |
1017 | ||
1018 | /* Reap the advantages of previously found beacons */ | |
1019 | static void reg_process_beacons(struct wiphy *wiphy) | |
1020 | { | |
b1ed8ddd LR |
1021 | /* |
1022 | * Means we are just firing up cfg80211, so no beacons would | |
1023 | * have been processed yet. | |
1024 | */ | |
1025 | if (!last_request) | |
1026 | return; | |
e38f8a7a LR |
1027 | if (!reg_is_world_roaming(wiphy)) |
1028 | return; | |
1029 | wiphy_update_beacon_reg(wiphy); | |
1030 | } | |
1031 | ||
038659e7 LR |
1032 | static bool is_ht40_not_allowed(struct ieee80211_channel *chan) |
1033 | { | |
1034 | if (!chan) | |
1035 | return true; | |
1036 | if (chan->flags & IEEE80211_CHAN_DISABLED) | |
1037 | return true; | |
1038 | /* This would happen when regulatory rules disallow HT40 completely */ | |
1039 | if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) | |
1040 | return true; | |
1041 | return false; | |
1042 | } | |
1043 | ||
1044 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, | |
1045 | enum ieee80211_band band, | |
1046 | unsigned int chan_idx) | |
1047 | { | |
1048 | struct ieee80211_supported_band *sband; | |
1049 | struct ieee80211_channel *channel; | |
1050 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; | |
1051 | unsigned int i; | |
1052 | ||
1053 | assert_cfg80211_lock(); | |
1054 | ||
1055 | sband = wiphy->bands[band]; | |
1056 | BUG_ON(chan_idx >= sband->n_channels); | |
1057 | channel = &sband->channels[chan_idx]; | |
1058 | ||
1059 | if (is_ht40_not_allowed(channel)) { | |
1060 | channel->flags |= IEEE80211_CHAN_NO_HT40; | |
1061 | return; | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * We need to ensure the extension channels exist to | |
1066 | * be able to use HT40- or HT40+, this finds them (or not) | |
1067 | */ | |
1068 | for (i = 0; i < sband->n_channels; i++) { | |
1069 | struct ieee80211_channel *c = &sband->channels[i]; | |
1070 | if (c->center_freq == (channel->center_freq - 20)) | |
1071 | channel_before = c; | |
1072 | if (c->center_freq == (channel->center_freq + 20)) | |
1073 | channel_after = c; | |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * Please note that this assumes target bandwidth is 20 MHz, | |
1078 | * if that ever changes we also need to change the below logic | |
1079 | * to include that as well. | |
1080 | */ | |
1081 | if (is_ht40_not_allowed(channel_before)) | |
689da1b3 | 1082 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 | 1083 | else |
689da1b3 | 1084 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 LR |
1085 | |
1086 | if (is_ht40_not_allowed(channel_after)) | |
689da1b3 | 1087 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 | 1088 | else |
689da1b3 | 1089 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 LR |
1090 | } |
1091 | ||
1092 | static void reg_process_ht_flags_band(struct wiphy *wiphy, | |
1093 | enum ieee80211_band band) | |
1094 | { | |
1095 | unsigned int i; | |
1096 | struct ieee80211_supported_band *sband; | |
1097 | ||
1098 | BUG_ON(!wiphy->bands[band]); | |
1099 | sband = wiphy->bands[band]; | |
1100 | ||
1101 | for (i = 0; i < sband->n_channels; i++) | |
1102 | reg_process_ht_flags_channel(wiphy, band, i); | |
1103 | } | |
1104 | ||
1105 | static void reg_process_ht_flags(struct wiphy *wiphy) | |
1106 | { | |
1107 | enum ieee80211_band band; | |
1108 | ||
1109 | if (!wiphy) | |
1110 | return; | |
1111 | ||
1112 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1113 | if (wiphy->bands[band]) | |
1114 | reg_process_ht_flags_band(wiphy, band); | |
1115 | } | |
1116 | ||
1117 | } | |
1118 | ||
7db90f4a LR |
1119 | void wiphy_update_regulatory(struct wiphy *wiphy, |
1120 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1121 | { |
1122 | enum ieee80211_band band; | |
d46e5b1d | 1123 | |
7db90f4a | 1124 | if (ignore_reg_update(wiphy, initiator)) |
e38f8a7a | 1125 | goto out; |
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 | } |
e38f8a7a LR |
1130 | out: |
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 | ||
1fa25e41 LR |
1137 | static void handle_channel_custom(struct wiphy *wiphy, |
1138 | enum ieee80211_band band, | |
1139 | unsigned int chan_idx, | |
1140 | const struct ieee80211_regdomain *regd) | |
1141 | { | |
1142 | int r; | |
038659e7 LR |
1143 | u32 desired_bw_khz = MHZ_TO_KHZ(20); |
1144 | u32 bw_flags = 0; | |
1fa25e41 LR |
1145 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1146 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 1147 | const struct ieee80211_freq_range *freq_range = NULL; |
1fa25e41 LR |
1148 | struct ieee80211_supported_band *sband; |
1149 | struct ieee80211_channel *chan; | |
1150 | ||
abc7381b | 1151 | assert_reg_lock(); |
ac46d48e | 1152 | |
1fa25e41 LR |
1153 | sband = wiphy->bands[band]; |
1154 | BUG_ON(chan_idx >= sband->n_channels); | |
1155 | chan = &sband->channels[chan_idx]; | |
1156 | ||
038659e7 LR |
1157 | r = freq_reg_info_regd(wiphy, |
1158 | MHZ_TO_KHZ(chan->center_freq), | |
1159 | desired_bw_khz, | |
1160 | ®_rule, | |
1161 | regd); | |
1fa25e41 LR |
1162 | |
1163 | if (r) { | |
d91e41b6 | 1164 | REG_DBG_PRINT("Disabling freq %d MHz as custom " |
a6518536 LR |
1165 | "regd has no rule that fits a %d MHz " |
1166 | "wide channel\n", | |
1167 | chan->center_freq, | |
1168 | KHZ_TO_MHZ(desired_bw_khz)); | |
1fa25e41 LR |
1169 | chan->flags = IEEE80211_CHAN_DISABLED; |
1170 | return; | |
1171 | } | |
1172 | ||
e702d3cf LR |
1173 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
1174 | ||
1fa25e41 | 1175 | power_rule = ®_rule->power_rule; |
038659e7 LR |
1176 | freq_range = ®_rule->freq_range; |
1177 | ||
1178 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1179 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
1fa25e41 | 1180 | |
038659e7 | 1181 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; |
1fa25e41 | 1182 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); |
1fa25e41 LR |
1183 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
1184 | } | |
1185 | ||
1186 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1187 | const struct ieee80211_regdomain *regd) | |
1188 | { | |
1189 | unsigned int i; | |
1190 | struct ieee80211_supported_band *sband; | |
1191 | ||
1192 | BUG_ON(!wiphy->bands[band]); | |
1193 | sband = wiphy->bands[band]; | |
1194 | ||
1195 | for (i = 0; i < sband->n_channels; i++) | |
1196 | handle_channel_custom(wiphy, band, i, regd); | |
1197 | } | |
1198 | ||
1199 | /* Used by drivers prior to wiphy registration */ | |
1200 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1201 | const struct ieee80211_regdomain *regd) | |
1202 | { | |
1203 | enum ieee80211_band band; | |
bbcf3f02 | 1204 | unsigned int bands_set = 0; |
ac46d48e | 1205 | |
abc7381b | 1206 | mutex_lock(®_mutex); |
1fa25e41 | 1207 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
bbcf3f02 LR |
1208 | if (!wiphy->bands[band]) |
1209 | continue; | |
1210 | handle_band_custom(wiphy, band, regd); | |
1211 | bands_set++; | |
b2e1b302 | 1212 | } |
abc7381b | 1213 | mutex_unlock(®_mutex); |
bbcf3f02 LR |
1214 | |
1215 | /* | |
1216 | * no point in calling this if it won't have any effect | |
1217 | * on your device's supportd bands. | |
1218 | */ | |
1219 | WARN_ON(!bands_set); | |
b2e1b302 | 1220 | } |
1fa25e41 LR |
1221 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1222 | ||
fb1fc7ad LR |
1223 | /* |
1224 | * Return value which can be used by ignore_request() to indicate | |
1225 | * it has been determined we should intersect two regulatory domains | |
1226 | */ | |
9c96477d LR |
1227 | #define REG_INTERSECT 1 |
1228 | ||
84fa4f43 JB |
1229 | /* This has the logic which determines when a new request |
1230 | * should be ignored. */ | |
2f92cd2e LR |
1231 | static int ignore_request(struct wiphy *wiphy, |
1232 | struct regulatory_request *pending_request) | |
84fa4f43 | 1233 | { |
806a9e39 | 1234 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1235 | |
1236 | assert_cfg80211_lock(); | |
1237 | ||
84fa4f43 JB |
1238 | /* All initial requests are respected */ |
1239 | if (!last_request) | |
1240 | return 0; | |
1241 | ||
2f92cd2e | 1242 | switch (pending_request->initiator) { |
7db90f4a | 1243 | case NL80211_REGDOM_SET_BY_CORE: |
09d989d1 | 1244 | return 0; |
7db90f4a | 1245 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1246 | |
1247 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1248 | ||
2f92cd2e | 1249 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1250 | return -EINVAL; |
7db90f4a LR |
1251 | if (last_request->initiator == |
1252 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1253 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1254 | /* |
1255 | * Two cards with two APs claiming different | |
1fe90b03 | 1256 | * Country IE alpha2s. We could |
84fa4f43 JB |
1257 | * intersect them, but that seems unlikely |
1258 | * to be correct. Reject second one for now. | |
1259 | */ | |
2f92cd2e | 1260 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1261 | return -EOPNOTSUPP; |
1262 | return -EALREADY; | |
1263 | } | |
fb1fc7ad LR |
1264 | /* |
1265 | * Two consecutive Country IE hints on the same wiphy. | |
1266 | * This should be picked up early by the driver/stack | |
1267 | */ | |
2f92cd2e | 1268 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1269 | return 0; |
1270 | return -EALREADY; | |
1271 | } | |
a171fba4 | 1272 | return 0; |
7db90f4a LR |
1273 | case NL80211_REGDOM_SET_BY_DRIVER: |
1274 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
2f92cd2e | 1275 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1276 | return 0; |
84fa4f43 | 1277 | return -EALREADY; |
e74b1e7f | 1278 | } |
fff32c04 LR |
1279 | |
1280 | /* | |
1281 | * This would happen if you unplug and plug your card | |
1282 | * back in or if you add a new device for which the previously | |
1283 | * loaded card also agrees on the regulatory domain. | |
1284 | */ | |
7db90f4a | 1285 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1286 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1287 | return -EALREADY; |
1288 | ||
3e0c3ff3 | 1289 | return REG_INTERSECT; |
7db90f4a LR |
1290 | case NL80211_REGDOM_SET_BY_USER: |
1291 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1292 | return REG_INTERSECT; |
fb1fc7ad LR |
1293 | /* |
1294 | * If the user knows better the user should set the regdom | |
1295 | * to their country before the IE is picked up | |
1296 | */ | |
7db90f4a | 1297 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1298 | last_request->intersect) |
1299 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1300 | /* |
1301 | * Process user requests only after previous user/driver/core | |
1302 | * requests have been processed | |
1303 | */ | |
7db90f4a LR |
1304 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1305 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1306 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
69b1572b | 1307 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1308 | return -EAGAIN; |
1309 | } | |
1310 | ||
baeb66fe | 1311 | if (!regdom_changes(pending_request->alpha2)) |
e74b1e7f LR |
1312 | return -EALREADY; |
1313 | ||
84fa4f43 JB |
1314 | return 0; |
1315 | } | |
1316 | ||
1317 | return -EINVAL; | |
1318 | } | |
1319 | ||
d1c96a9a LR |
1320 | /** |
1321 | * __regulatory_hint - hint to the wireless core a regulatory domain | |
1322 | * @wiphy: if the hint comes from country information from an AP, this | |
1323 | * is required to be set to the wiphy that received the information | |
28da32d7 | 1324 | * @pending_request: the regulatory request currently being processed |
d1c96a9a LR |
1325 | * |
1326 | * The Wireless subsystem can use this function to hint to the wireless core | |
28da32d7 | 1327 | * what it believes should be the current regulatory domain. |
d1c96a9a LR |
1328 | * |
1329 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1330 | * already been set or other standard error codes. | |
1331 | * | |
abc7381b | 1332 | * Caller must hold &cfg80211_mutex and ®_mutex |
d1c96a9a | 1333 | */ |
28da32d7 LR |
1334 | static int __regulatory_hint(struct wiphy *wiphy, |
1335 | struct regulatory_request *pending_request) | |
b2e1b302 | 1336 | { |
9c96477d | 1337 | bool intersect = false; |
b2e1b302 LR |
1338 | int r = 0; |
1339 | ||
761cf7ec LR |
1340 | assert_cfg80211_lock(); |
1341 | ||
2f92cd2e | 1342 | r = ignore_request(wiphy, pending_request); |
9c96477d | 1343 | |
3e0c3ff3 | 1344 | if (r == REG_INTERSECT) { |
7db90f4a LR |
1345 | if (pending_request->initiator == |
1346 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1347 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1348 | if (r) { |
1349 | kfree(pending_request); | |
3e0c3ff3 | 1350 | return r; |
d951c1dd | 1351 | } |
3e0c3ff3 | 1352 | } |
9c96477d | 1353 | intersect = true; |
3e0c3ff3 | 1354 | } else if (r) { |
fb1fc7ad LR |
1355 | /* |
1356 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1357 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1358 | * wiphy |
1359 | */ | |
28da32d7 | 1360 | if (r == -EALREADY && |
7db90f4a LR |
1361 | pending_request->initiator == |
1362 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1363 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1364 | if (r) { |
1365 | kfree(pending_request); | |
3e0c3ff3 | 1366 | return r; |
d951c1dd | 1367 | } |
3e0c3ff3 LR |
1368 | r = -EALREADY; |
1369 | goto new_request; | |
1370 | } | |
d951c1dd | 1371 | kfree(pending_request); |
b2e1b302 | 1372 | return r; |
3e0c3ff3 | 1373 | } |
b2e1b302 | 1374 | |
3e0c3ff3 | 1375 | new_request: |
d951c1dd | 1376 | kfree(last_request); |
5203cdb6 | 1377 | |
d951c1dd LR |
1378 | last_request = pending_request; |
1379 | last_request->intersect = intersect; | |
5203cdb6 | 1380 | |
d951c1dd | 1381 | pending_request = NULL; |
3e0c3ff3 | 1382 | |
09d989d1 LR |
1383 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) { |
1384 | user_alpha2[0] = last_request->alpha2[0]; | |
1385 | user_alpha2[1] = last_request->alpha2[1]; | |
1386 | } | |
1387 | ||
3e0c3ff3 | 1388 | /* When r == REG_INTERSECT we do need to call CRDA */ |
73d54c9e LR |
1389 | if (r < 0) { |
1390 | /* | |
1391 | * Since CRDA will not be called in this case as we already | |
1392 | * have applied the requested regulatory domain before we just | |
1393 | * inform userspace we have processed the request | |
1394 | */ | |
1395 | if (r == -EALREADY) | |
1396 | nl80211_send_reg_change_event(last_request); | |
3e0c3ff3 | 1397 | return r; |
73d54c9e | 1398 | } |
3e0c3ff3 | 1399 | |
d951c1dd | 1400 | return call_crda(last_request->alpha2); |
b2e1b302 LR |
1401 | } |
1402 | ||
30a548c7 | 1403 | /* This processes *all* regulatory hints */ |
d951c1dd | 1404 | static void reg_process_hint(struct regulatory_request *reg_request) |
fe33eb39 LR |
1405 | { |
1406 | int r = 0; | |
1407 | struct wiphy *wiphy = NULL; | |
c4c32294 | 1408 | enum nl80211_reg_initiator initiator = reg_request->initiator; |
fe33eb39 LR |
1409 | |
1410 | BUG_ON(!reg_request->alpha2); | |
1411 | ||
1412 | mutex_lock(&cfg80211_mutex); | |
abc7381b | 1413 | mutex_lock(®_mutex); |
fe33eb39 LR |
1414 | |
1415 | if (wiphy_idx_valid(reg_request->wiphy_idx)) | |
1416 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1417 | ||
7db90f4a | 1418 | if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
fe33eb39 | 1419 | !wiphy) { |
d951c1dd | 1420 | kfree(reg_request); |
fe33eb39 LR |
1421 | goto out; |
1422 | } | |
1423 | ||
28da32d7 | 1424 | r = __regulatory_hint(wiphy, reg_request); |
fe33eb39 | 1425 | /* This is required so that the orig_* parameters are saved */ |
5be83de5 JB |
1426 | if (r == -EALREADY && wiphy && |
1427 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) | |
c4c32294 | 1428 | wiphy_update_regulatory(wiphy, initiator); |
fe33eb39 | 1429 | out: |
abc7381b | 1430 | mutex_unlock(®_mutex); |
fe33eb39 | 1431 | mutex_unlock(&cfg80211_mutex); |
fe33eb39 LR |
1432 | } |
1433 | ||
7db90f4a | 1434 | /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */ |
fe33eb39 LR |
1435 | static void reg_process_pending_hints(void) |
1436 | { | |
1437 | struct regulatory_request *reg_request; | |
fe33eb39 LR |
1438 | |
1439 | spin_lock(®_requests_lock); | |
1440 | while (!list_empty(®_requests_list)) { | |
1441 | reg_request = list_first_entry(®_requests_list, | |
1442 | struct regulatory_request, | |
1443 | list); | |
1444 | list_del_init(®_request->list); | |
fe33eb39 | 1445 | |
d951c1dd LR |
1446 | spin_unlock(®_requests_lock); |
1447 | reg_process_hint(reg_request); | |
fe33eb39 LR |
1448 | spin_lock(®_requests_lock); |
1449 | } | |
1450 | spin_unlock(®_requests_lock); | |
1451 | } | |
1452 | ||
e38f8a7a LR |
1453 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1454 | static void reg_process_pending_beacon_hints(void) | |
1455 | { | |
79c97e97 | 1456 | struct cfg80211_registered_device *rdev; |
e38f8a7a LR |
1457 | struct reg_beacon *pending_beacon, *tmp; |
1458 | ||
abc7381b LR |
1459 | /* |
1460 | * No need to hold the reg_mutex here as we just touch wiphys | |
1461 | * and do not read or access regulatory variables. | |
1462 | */ | |
e38f8a7a LR |
1463 | mutex_lock(&cfg80211_mutex); |
1464 | ||
1465 | /* This goes through the _pending_ beacon list */ | |
1466 | spin_lock_bh(®_pending_beacons_lock); | |
1467 | ||
1468 | if (list_empty(®_pending_beacons)) { | |
1469 | spin_unlock_bh(®_pending_beacons_lock); | |
1470 | goto out; | |
1471 | } | |
1472 | ||
1473 | list_for_each_entry_safe(pending_beacon, tmp, | |
1474 | ®_pending_beacons, list) { | |
1475 | ||
1476 | list_del_init(&pending_beacon->list); | |
1477 | ||
1478 | /* Applies the beacon hint to current wiphys */ | |
79c97e97 JB |
1479 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1480 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); | |
e38f8a7a LR |
1481 | |
1482 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
1483 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
1484 | } | |
1485 | ||
1486 | spin_unlock_bh(®_pending_beacons_lock); | |
1487 | out: | |
1488 | mutex_unlock(&cfg80211_mutex); | |
1489 | } | |
1490 | ||
fe33eb39 LR |
1491 | static void reg_todo(struct work_struct *work) |
1492 | { | |
1493 | reg_process_pending_hints(); | |
e38f8a7a | 1494 | reg_process_pending_beacon_hints(); |
fe33eb39 LR |
1495 | } |
1496 | ||
1497 | static DECLARE_WORK(reg_work, reg_todo); | |
1498 | ||
1499 | static void queue_regulatory_request(struct regulatory_request *request) | |
1500 | { | |
c61029c7 JL |
1501 | if (isalpha(request->alpha2[0])) |
1502 | request->alpha2[0] = toupper(request->alpha2[0]); | |
1503 | if (isalpha(request->alpha2[1])) | |
1504 | request->alpha2[1] = toupper(request->alpha2[1]); | |
1505 | ||
fe33eb39 LR |
1506 | spin_lock(®_requests_lock); |
1507 | list_add_tail(&request->list, ®_requests_list); | |
1508 | spin_unlock(®_requests_lock); | |
1509 | ||
1510 | schedule_work(®_work); | |
1511 | } | |
1512 | ||
09d989d1 LR |
1513 | /* |
1514 | * Core regulatory hint -- happens during cfg80211_init() | |
1515 | * and when we restore regulatory settings. | |
1516 | */ | |
ba25c141 LR |
1517 | static int regulatory_hint_core(const char *alpha2) |
1518 | { | |
1519 | struct regulatory_request *request; | |
1520 | ||
09d989d1 LR |
1521 | kfree(last_request); |
1522 | last_request = NULL; | |
ba25c141 LR |
1523 | |
1524 | request = kzalloc(sizeof(struct regulatory_request), | |
1525 | GFP_KERNEL); | |
1526 | if (!request) | |
1527 | return -ENOMEM; | |
1528 | ||
1529 | request->alpha2[0] = alpha2[0]; | |
1530 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1531 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
ba25c141 | 1532 | |
31e99729 | 1533 | queue_regulatory_request(request); |
5078b2e3 | 1534 | |
fe33eb39 | 1535 | return 0; |
ba25c141 LR |
1536 | } |
1537 | ||
fe33eb39 LR |
1538 | /* User hints */ |
1539 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1540 | { |
fe33eb39 LR |
1541 | struct regulatory_request *request; |
1542 | ||
be3d4810 | 1543 | BUG_ON(!alpha2); |
b2e1b302 | 1544 | |
fe33eb39 LR |
1545 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1546 | if (!request) | |
1547 | return -ENOMEM; | |
1548 | ||
1549 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1550 | request->alpha2[0] = alpha2[0]; | |
1551 | request->alpha2[1] = alpha2[1]; | |
e12822e1 | 1552 | request->initiator = NL80211_REGDOM_SET_BY_USER; |
fe33eb39 LR |
1553 | |
1554 | queue_regulatory_request(request); | |
1555 | ||
1556 | return 0; | |
1557 | } | |
1558 | ||
1559 | /* Driver hints */ | |
1560 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1561 | { | |
1562 | struct regulatory_request *request; | |
1563 | ||
1564 | BUG_ON(!alpha2); | |
1565 | BUG_ON(!wiphy); | |
1566 | ||
1567 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1568 | if (!request) | |
1569 | return -ENOMEM; | |
1570 | ||
1571 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1572 | ||
1573 | /* Must have registered wiphy first */ | |
1574 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1575 | ||
1576 | request->alpha2[0] = alpha2[0]; | |
1577 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1578 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
fe33eb39 LR |
1579 | |
1580 | queue_regulatory_request(request); | |
1581 | ||
1582 | return 0; | |
b2e1b302 LR |
1583 | } |
1584 | EXPORT_SYMBOL(regulatory_hint); | |
1585 | ||
4b44c8bc LR |
1586 | /* |
1587 | * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and | |
1588 | * therefore cannot iterate over the rdev list here. | |
1589 | */ | |
3f2355cb | 1590 | void regulatory_hint_11d(struct wiphy *wiphy, |
84920e3e LR |
1591 | enum ieee80211_band band, |
1592 | u8 *country_ie, | |
1593 | u8 country_ie_len) | |
3f2355cb | 1594 | { |
3f2355cb | 1595 | char alpha2[2]; |
3f2355cb | 1596 | enum environment_cap env = ENVIRON_ANY; |
fe33eb39 | 1597 | struct regulatory_request *request; |
3f2355cb | 1598 | |
abc7381b | 1599 | mutex_lock(®_mutex); |
3f2355cb | 1600 | |
9828b017 LR |
1601 | if (unlikely(!last_request)) |
1602 | goto out; | |
d335fe63 | 1603 | |
3f2355cb LR |
1604 | /* IE len must be evenly divisible by 2 */ |
1605 | if (country_ie_len & 0x01) | |
1606 | goto out; | |
1607 | ||
1608 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1609 | goto out; | |
1610 | ||
3f2355cb LR |
1611 | alpha2[0] = country_ie[0]; |
1612 | alpha2[1] = country_ie[1]; | |
1613 | ||
1614 | if (country_ie[2] == 'I') | |
1615 | env = ENVIRON_INDOOR; | |
1616 | else if (country_ie[2] == 'O') | |
1617 | env = ENVIRON_OUTDOOR; | |
1618 | ||
fb1fc7ad | 1619 | /* |
8b19e6ca | 1620 | * We will run this only upon a successful connection on cfg80211. |
4b44c8bc LR |
1621 | * We leave conflict resolution to the workqueue, where can hold |
1622 | * cfg80211_mutex. | |
fb1fc7ad | 1623 | */ |
cc0b6fe8 LR |
1624 | if (likely(last_request->initiator == |
1625 | NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
4b44c8bc LR |
1626 | wiphy_idx_valid(last_request->wiphy_idx))) |
1627 | goto out; | |
3f2355cb | 1628 | |
fe33eb39 LR |
1629 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1630 | if (!request) | |
f9f9b6e3 | 1631 | goto out; |
fe33eb39 | 1632 | |
fe33eb39 | 1633 | request->wiphy_idx = get_wiphy_idx(wiphy); |
4f366c5d JL |
1634 | request->alpha2[0] = alpha2[0]; |
1635 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1636 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
fe33eb39 LR |
1637 | request->country_ie_env = env; |
1638 | ||
abc7381b | 1639 | mutex_unlock(®_mutex); |
3f2355cb | 1640 | |
fe33eb39 LR |
1641 | queue_regulatory_request(request); |
1642 | ||
1643 | return; | |
0441d6ff | 1644 | |
3f2355cb | 1645 | out: |
abc7381b | 1646 | mutex_unlock(®_mutex); |
3f2355cb | 1647 | } |
b2e1b302 | 1648 | |
09d989d1 LR |
1649 | static void restore_alpha2(char *alpha2, bool reset_user) |
1650 | { | |
1651 | /* indicates there is no alpha2 to consider for restoration */ | |
1652 | alpha2[0] = '9'; | |
1653 | alpha2[1] = '7'; | |
1654 | ||
1655 | /* The user setting has precedence over the module parameter */ | |
1656 | if (is_user_regdom_saved()) { | |
1657 | /* Unless we're asked to ignore it and reset it */ | |
1658 | if (reset_user) { | |
d91e41b6 | 1659 | REG_DBG_PRINT("Restoring regulatory settings " |
09d989d1 LR |
1660 | "including user preference\n"); |
1661 | user_alpha2[0] = '9'; | |
1662 | user_alpha2[1] = '7'; | |
1663 | ||
1664 | /* | |
1665 | * If we're ignoring user settings, we still need to | |
1666 | * check the module parameter to ensure we put things | |
1667 | * back as they were for a full restore. | |
1668 | */ | |
1669 | if (!is_world_regdom(ieee80211_regdom)) { | |
d91e41b6 | 1670 | REG_DBG_PRINT("Keeping preference on " |
09d989d1 LR |
1671 | "module parameter ieee80211_regdom: %c%c\n", |
1672 | ieee80211_regdom[0], | |
1673 | ieee80211_regdom[1]); | |
1674 | alpha2[0] = ieee80211_regdom[0]; | |
1675 | alpha2[1] = ieee80211_regdom[1]; | |
1676 | } | |
1677 | } else { | |
d91e41b6 | 1678 | REG_DBG_PRINT("Restoring regulatory settings " |
09d989d1 LR |
1679 | "while preserving user preference for: %c%c\n", |
1680 | user_alpha2[0], | |
1681 | user_alpha2[1]); | |
1682 | alpha2[0] = user_alpha2[0]; | |
1683 | alpha2[1] = user_alpha2[1]; | |
1684 | } | |
1685 | } else if (!is_world_regdom(ieee80211_regdom)) { | |
d91e41b6 | 1686 | REG_DBG_PRINT("Keeping preference on " |
09d989d1 LR |
1687 | "module parameter ieee80211_regdom: %c%c\n", |
1688 | ieee80211_regdom[0], | |
1689 | ieee80211_regdom[1]); | |
1690 | alpha2[0] = ieee80211_regdom[0]; | |
1691 | alpha2[1] = ieee80211_regdom[1]; | |
1692 | } else | |
d91e41b6 | 1693 | REG_DBG_PRINT("Restoring regulatory settings\n"); |
09d989d1 LR |
1694 | } |
1695 | ||
1696 | /* | |
1697 | * Restoring regulatory settings involves ingoring any | |
1698 | * possibly stale country IE information and user regulatory | |
1699 | * settings if so desired, this includes any beacon hints | |
1700 | * learned as we could have traveled outside to another country | |
1701 | * after disconnection. To restore regulatory settings we do | |
1702 | * exactly what we did at bootup: | |
1703 | * | |
1704 | * - send a core regulatory hint | |
1705 | * - send a user regulatory hint if applicable | |
1706 | * | |
1707 | * Device drivers that send a regulatory hint for a specific country | |
1708 | * keep their own regulatory domain on wiphy->regd so that does does | |
1709 | * not need to be remembered. | |
1710 | */ | |
1711 | static void restore_regulatory_settings(bool reset_user) | |
1712 | { | |
1713 | char alpha2[2]; | |
1714 | struct reg_beacon *reg_beacon, *btmp; | |
1715 | ||
1716 | mutex_lock(&cfg80211_mutex); | |
1717 | mutex_lock(®_mutex); | |
1718 | ||
1719 | reset_regdomains(); | |
1720 | restore_alpha2(alpha2, reset_user); | |
1721 | ||
1722 | /* Clear beacon hints */ | |
1723 | spin_lock_bh(®_pending_beacons_lock); | |
1724 | if (!list_empty(®_pending_beacons)) { | |
1725 | list_for_each_entry_safe(reg_beacon, btmp, | |
1726 | ®_pending_beacons, list) { | |
1727 | list_del(®_beacon->list); | |
1728 | kfree(reg_beacon); | |
1729 | } | |
1730 | } | |
1731 | spin_unlock_bh(®_pending_beacons_lock); | |
1732 | ||
1733 | if (!list_empty(®_beacon_list)) { | |
1734 | list_for_each_entry_safe(reg_beacon, btmp, | |
1735 | ®_beacon_list, list) { | |
1736 | list_del(®_beacon->list); | |
1737 | kfree(reg_beacon); | |
1738 | } | |
1739 | } | |
1740 | ||
1741 | /* First restore to the basic regulatory settings */ | |
1742 | cfg80211_regdomain = cfg80211_world_regdom; | |
1743 | ||
1744 | mutex_unlock(®_mutex); | |
1745 | mutex_unlock(&cfg80211_mutex); | |
1746 | ||
1747 | regulatory_hint_core(cfg80211_regdomain->alpha2); | |
1748 | ||
1749 | /* | |
1750 | * This restores the ieee80211_regdom module parameter | |
1751 | * preference or the last user requested regulatory | |
1752 | * settings, user regulatory settings takes precedence. | |
1753 | */ | |
1754 | if (is_an_alpha2(alpha2)) | |
1755 | regulatory_hint_user(user_alpha2); | |
1756 | } | |
1757 | ||
1758 | ||
1759 | void regulatory_hint_disconnect(void) | |
1760 | { | |
d91e41b6 | 1761 | REG_DBG_PRINT("All devices are disconnected, going to " |
09d989d1 LR |
1762 | "restore regulatory settings\n"); |
1763 | restore_regulatory_settings(false); | |
1764 | } | |
1765 | ||
e38f8a7a LR |
1766 | static bool freq_is_chan_12_13_14(u16 freq) |
1767 | { | |
1768 | if (freq == ieee80211_channel_to_frequency(12) || | |
1769 | freq == ieee80211_channel_to_frequency(13) || | |
1770 | freq == ieee80211_channel_to_frequency(14)) | |
1771 | return true; | |
1772 | return false; | |
1773 | } | |
1774 | ||
1775 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
1776 | struct ieee80211_channel *beacon_chan, | |
1777 | gfp_t gfp) | |
1778 | { | |
1779 | struct reg_beacon *reg_beacon; | |
1780 | ||
1781 | if (likely((beacon_chan->beacon_found || | |
1782 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || | |
1783 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
1784 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) | |
1785 | return 0; | |
1786 | ||
1787 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
1788 | if (!reg_beacon) | |
1789 | return -ENOMEM; | |
1790 | ||
d91e41b6 | 1791 | REG_DBG_PRINT("Found new beacon on " |
4113f751 LR |
1792 | "frequency: %d MHz (Ch %d) on %s\n", |
1793 | beacon_chan->center_freq, | |
1794 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
1795 | wiphy_name(wiphy)); | |
1796 | ||
e38f8a7a LR |
1797 | memcpy(®_beacon->chan, beacon_chan, |
1798 | sizeof(struct ieee80211_channel)); | |
1799 | ||
1800 | ||
1801 | /* | |
1802 | * Since we can be called from BH or and non-BH context | |
1803 | * we must use spin_lock_bh() | |
1804 | */ | |
1805 | spin_lock_bh(®_pending_beacons_lock); | |
1806 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
1807 | spin_unlock_bh(®_pending_beacons_lock); | |
1808 | ||
1809 | schedule_work(®_work); | |
1810 | ||
1811 | return 0; | |
1812 | } | |
1813 | ||
a3d2eaf0 | 1814 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1815 | { |
1816 | unsigned int i; | |
a3d2eaf0 JB |
1817 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1818 | const struct ieee80211_freq_range *freq_range = NULL; | |
1819 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 | 1820 | |
269ac5fd | 1821 | printk(KERN_INFO " (start_freq - end_freq @ bandwidth), " |
b2e1b302 LR |
1822 | "(max_antenna_gain, max_eirp)\n"); |
1823 | ||
1824 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1825 | reg_rule = &rd->reg_rules[i]; | |
1826 | freq_range = ®_rule->freq_range; | |
1827 | power_rule = ®_rule->power_rule; | |
1828 | ||
fb1fc7ad LR |
1829 | /* |
1830 | * There may not be documentation for max antenna gain | |
1831 | * in certain regions | |
1832 | */ | |
b2e1b302 | 1833 | if (power_rule->max_antenna_gain) |
269ac5fd | 1834 | printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), " |
b2e1b302 LR |
1835 | "(%d mBi, %d mBm)\n", |
1836 | freq_range->start_freq_khz, | |
1837 | freq_range->end_freq_khz, | |
1838 | freq_range->max_bandwidth_khz, | |
1839 | power_rule->max_antenna_gain, | |
1840 | power_rule->max_eirp); | |
1841 | else | |
269ac5fd | 1842 | printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), " |
b2e1b302 LR |
1843 | "(N/A, %d mBm)\n", |
1844 | freq_range->start_freq_khz, | |
1845 | freq_range->end_freq_khz, | |
1846 | freq_range->max_bandwidth_khz, | |
1847 | power_rule->max_eirp); | |
1848 | } | |
1849 | } | |
1850 | ||
a3d2eaf0 | 1851 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1852 | { |
1853 | ||
3f2355cb | 1854 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 1855 | |
7db90f4a LR |
1856 | if (last_request->initiator == |
1857 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
79c97e97 JB |
1858 | struct cfg80211_registered_device *rdev; |
1859 | rdev = cfg80211_rdev_by_wiphy_idx( | |
806a9e39 | 1860 | last_request->wiphy_idx); |
79c97e97 | 1861 | if (rdev) { |
3f2355cb LR |
1862 | printk(KERN_INFO "cfg80211: Current regulatory " |
1863 | "domain updated by AP to: %c%c\n", | |
79c97e97 JB |
1864 | rdev->country_ie_alpha2[0], |
1865 | rdev->country_ie_alpha2[1]); | |
3f2355cb LR |
1866 | } else |
1867 | printk(KERN_INFO "cfg80211: Current regulatory " | |
55f98938 | 1868 | "domain intersected:\n"); |
3f2355cb | 1869 | } else |
55f98938 FP |
1870 | printk(KERN_INFO "cfg80211: Current regulatory " |
1871 | "domain intersected:\n"); | |
3f2355cb | 1872 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
1873 | printk(KERN_INFO "cfg80211: World regulatory " |
1874 | "domain updated:\n"); | |
1875 | else { | |
1876 | if (is_unknown_alpha2(rd->alpha2)) | |
1877 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1878 | "changed to driver built-in settings " | |
1879 | "(unknown country)\n"); | |
1880 | else | |
1881 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1882 | "changed to country: %c%c\n", | |
1883 | rd->alpha2[0], rd->alpha2[1]); | |
1884 | } | |
1885 | print_rd_rules(rd); | |
1886 | } | |
1887 | ||
2df78167 | 1888 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1889 | { |
1890 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1891 | rd->alpha2[0], rd->alpha2[1]); | |
1892 | print_rd_rules(rd); | |
1893 | } | |
1894 | ||
d2372b31 | 1895 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1896 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1897 | { |
9c96477d | 1898 | const struct ieee80211_regdomain *intersected_rd = NULL; |
79c97e97 | 1899 | struct cfg80211_registered_device *rdev = NULL; |
806a9e39 | 1900 | struct wiphy *request_wiphy; |
b2e1b302 LR |
1901 | /* Some basic sanity checks first */ |
1902 | ||
b2e1b302 | 1903 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1904 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1905 | return -EINVAL; |
1906 | update_world_regdomain(rd); | |
1907 | return 0; | |
1908 | } | |
b2e1b302 LR |
1909 | |
1910 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1911 | !is_unknown_alpha2(rd->alpha2)) | |
1912 | return -EINVAL; | |
1913 | ||
f6037d09 | 1914 | if (!last_request) |
b2e1b302 LR |
1915 | return -EINVAL; |
1916 | ||
fb1fc7ad LR |
1917 | /* |
1918 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 1919 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
1920 | * and the pending request came in from a country IE |
1921 | */ | |
7db90f4a | 1922 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
1923 | /* |
1924 | * If someone else asked us to change the rd lets only bother | |
1925 | * checking if the alpha2 changes if CRDA was already called | |
1926 | */ | |
baeb66fe | 1927 | if (!regdom_changes(rd->alpha2)) |
3f2355cb LR |
1928 | return -EINVAL; |
1929 | } | |
1930 | ||
fb1fc7ad LR |
1931 | /* |
1932 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
1933 | * and finally inform them of what we have done, in case they want |
1934 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
1935 | * internal EEPROM data |
1936 | */ | |
b2e1b302 | 1937 | |
f6037d09 | 1938 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1939 | return -EINVAL; |
1940 | ||
8375af3b LR |
1941 | if (!is_valid_rd(rd)) { |
1942 | printk(KERN_ERR "cfg80211: Invalid " | |
1943 | "regulatory domain detected:\n"); | |
1944 | print_regdomain_info(rd); | |
1945 | return -EINVAL; | |
b2e1b302 LR |
1946 | } |
1947 | ||
806a9e39 LR |
1948 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1949 | ||
b8295acd | 1950 | if (!last_request->intersect) { |
3e0c3ff3 LR |
1951 | int r; |
1952 | ||
7db90f4a | 1953 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
3e0c3ff3 LR |
1954 | reset_regdomains(); |
1955 | cfg80211_regdomain = rd; | |
1956 | return 0; | |
1957 | } | |
1958 | ||
fb1fc7ad LR |
1959 | /* |
1960 | * For a driver hint, lets copy the regulatory domain the | |
1961 | * driver wanted to the wiphy to deal with conflicts | |
1962 | */ | |
3e0c3ff3 | 1963 | |
558f6d32 LR |
1964 | /* |
1965 | * Userspace could have sent two replies with only | |
1966 | * one kernel request. | |
1967 | */ | |
1968 | if (request_wiphy->regd) | |
1969 | return -EALREADY; | |
3e0c3ff3 | 1970 | |
806a9e39 | 1971 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
1972 | if (r) |
1973 | return r; | |
1974 | ||
b8295acd LR |
1975 | reset_regdomains(); |
1976 | cfg80211_regdomain = rd; | |
1977 | return 0; | |
1978 | } | |
1979 | ||
1980 | /* Intersection requires a bit more work */ | |
1981 | ||
7db90f4a | 1982 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 1983 | |
9c96477d LR |
1984 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
1985 | if (!intersected_rd) | |
1986 | return -EINVAL; | |
b8295acd | 1987 | |
fb1fc7ad LR |
1988 | /* |
1989 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 1990 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
1991 | * domain we keep it for its private use |
1992 | */ | |
7db90f4a | 1993 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 1994 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
1995 | else |
1996 | kfree(rd); | |
1997 | ||
b8295acd LR |
1998 | rd = NULL; |
1999 | ||
2000 | reset_regdomains(); | |
2001 | cfg80211_regdomain = intersected_rd; | |
2002 | ||
2003 | return 0; | |
9c96477d LR |
2004 | } |
2005 | ||
3f2355cb LR |
2006 | if (!intersected_rd) |
2007 | return -EINVAL; | |
2008 | ||
79c97e97 | 2009 | rdev = wiphy_to_dev(request_wiphy); |
3f2355cb | 2010 | |
79c97e97 JB |
2011 | rdev->country_ie_alpha2[0] = rd->alpha2[0]; |
2012 | rdev->country_ie_alpha2[1] = rd->alpha2[1]; | |
2013 | rdev->env = last_request->country_ie_env; | |
3f2355cb LR |
2014 | |
2015 | BUG_ON(intersected_rd == rd); | |
2016 | ||
2017 | kfree(rd); | |
2018 | rd = NULL; | |
2019 | ||
b8295acd | 2020 | reset_regdomains(); |
3f2355cb | 2021 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2022 | |
2023 | return 0; | |
2024 | } | |
2025 | ||
2026 | ||
fb1fc7ad LR |
2027 | /* |
2028 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2029 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2030 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2031 | */ | |
a3d2eaf0 | 2032 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2033 | { |
b2e1b302 LR |
2034 | int r; |
2035 | ||
761cf7ec LR |
2036 | assert_cfg80211_lock(); |
2037 | ||
abc7381b LR |
2038 | mutex_lock(®_mutex); |
2039 | ||
b2e1b302 LR |
2040 | /* Note that this doesn't update the wiphys, this is done below */ |
2041 | r = __set_regdom(rd); | |
d2372b31 JB |
2042 | if (r) { |
2043 | kfree(rd); | |
abc7381b | 2044 | mutex_unlock(®_mutex); |
b2e1b302 | 2045 | return r; |
d2372b31 | 2046 | } |
b2e1b302 | 2047 | |
b2e1b302 | 2048 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2049 | if (!last_request->intersect) |
2050 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2051 | |
2052 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2053 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2054 | |
a01ddafd | 2055 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2056 | |
73d54c9e LR |
2057 | nl80211_send_reg_change_event(last_request); |
2058 | ||
abc7381b LR |
2059 | mutex_unlock(®_mutex); |
2060 | ||
b2e1b302 LR |
2061 | return r; |
2062 | } | |
2063 | ||
a1794390 | 2064 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2065 | void reg_device_remove(struct wiphy *wiphy) |
2066 | { | |
0ad8acaf | 2067 | struct wiphy *request_wiphy = NULL; |
806a9e39 | 2068 | |
761cf7ec LR |
2069 | assert_cfg80211_lock(); |
2070 | ||
abc7381b LR |
2071 | mutex_lock(®_mutex); |
2072 | ||
0ef9ccdd CW |
2073 | kfree(wiphy->regd); |
2074 | ||
0ad8acaf LR |
2075 | if (last_request) |
2076 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
806a9e39 | 2077 | |
0ef9ccdd | 2078 | if (!request_wiphy || request_wiphy != wiphy) |
abc7381b | 2079 | goto out; |
0ef9ccdd | 2080 | |
806a9e39 | 2081 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb | 2082 | last_request->country_ie_env = ENVIRON_ANY; |
abc7381b LR |
2083 | out: |
2084 | mutex_unlock(®_mutex); | |
3f2355cb LR |
2085 | } |
2086 | ||
2fcc9f73 | 2087 | int __init regulatory_init(void) |
b2e1b302 | 2088 | { |
bcf4f99b | 2089 | int err = 0; |
734366de | 2090 | |
b2e1b302 LR |
2091 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2092 | if (IS_ERR(reg_pdev)) | |
2093 | return PTR_ERR(reg_pdev); | |
734366de | 2094 | |
fe33eb39 | 2095 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2096 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2097 | |
a3d2eaf0 | 2098 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2099 | |
09d989d1 LR |
2100 | user_alpha2[0] = '9'; |
2101 | user_alpha2[1] = '7'; | |
2102 | ||
ae9e4b0d LR |
2103 | /* We always try to get an update for the static regdomain */ |
2104 | err = regulatory_hint_core(cfg80211_regdomain->alpha2); | |
ba25c141 | 2105 | if (err) { |
bcf4f99b LR |
2106 | if (err == -ENOMEM) |
2107 | return err; | |
2108 | /* | |
2109 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2110 | * memory which is handled and propagated appropriately above | |
2111 | * but it can also fail during a netlink_broadcast() or during | |
2112 | * early boot for call_usermodehelper(). For now treat these | |
2113 | * errors as non-fatal. | |
2114 | */ | |
2115 | printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " | |
2116 | "to call CRDA during init"); | |
2117 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
2118 | /* We want to find out exactly why when debugging */ | |
2119 | WARN_ON(err); | |
734366de | 2120 | #endif |
bcf4f99b | 2121 | } |
734366de | 2122 | |
ae9e4b0d LR |
2123 | /* |
2124 | * Finally, if the user set the module parameter treat it | |
2125 | * as a user hint. | |
2126 | */ | |
2127 | if (!is_world_regdom(ieee80211_regdom)) | |
2128 | regulatory_hint_user(ieee80211_regdom); | |
2129 | ||
b2e1b302 LR |
2130 | return 0; |
2131 | } | |
2132 | ||
2fcc9f73 | 2133 | void /* __init_or_exit */ regulatory_exit(void) |
b2e1b302 | 2134 | { |
fe33eb39 | 2135 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2136 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2137 | |
2138 | cancel_work_sync(®_work); | |
2139 | ||
a1794390 | 2140 | mutex_lock(&cfg80211_mutex); |
abc7381b | 2141 | mutex_lock(®_mutex); |
734366de | 2142 | |
b2e1b302 | 2143 | reset_regdomains(); |
734366de | 2144 | |
f6037d09 JB |
2145 | kfree(last_request); |
2146 | ||
b2e1b302 | 2147 | platform_device_unregister(reg_pdev); |
734366de | 2148 | |
e38f8a7a LR |
2149 | spin_lock_bh(®_pending_beacons_lock); |
2150 | if (!list_empty(®_pending_beacons)) { | |
2151 | list_for_each_entry_safe(reg_beacon, btmp, | |
2152 | ®_pending_beacons, list) { | |
2153 | list_del(®_beacon->list); | |
2154 | kfree(reg_beacon); | |
2155 | } | |
2156 | } | |
2157 | spin_unlock_bh(®_pending_beacons_lock); | |
2158 | ||
2159 | if (!list_empty(®_beacon_list)) { | |
2160 | list_for_each_entry_safe(reg_beacon, btmp, | |
2161 | ®_beacon_list, list) { | |
2162 | list_del(®_beacon->list); | |
2163 | kfree(reg_beacon); | |
2164 | } | |
2165 | } | |
2166 | ||
fe33eb39 LR |
2167 | spin_lock(®_requests_lock); |
2168 | if (!list_empty(®_requests_list)) { | |
2169 | list_for_each_entry_safe(reg_request, tmp, | |
2170 | ®_requests_list, list) { | |
2171 | list_del(®_request->list); | |
2172 | kfree(reg_request); | |
2173 | } | |
2174 | } | |
2175 | spin_unlock(®_requests_lock); | |
2176 | ||
abc7381b | 2177 | mutex_unlock(®_mutex); |
a1794390 | 2178 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2179 | } |