Commit | Line | Data |
---|---|---|
8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
b2e1b302 | 5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
8318d78a JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
b2e1b302 LR |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
14 | * |
15 | * The usual implementation is for a driver to read a device EEPROM to | |
16 | * determine which regulatory domain it should be operating under, then | |
17 | * looking up the allowable channels in a driver-local table and finally | |
18 | * registering those channels in the wiphy structure. | |
19 | * | |
b2e1b302 LR |
20 | * Another set of compliance enforcement is for drivers to use their |
21 | * own compliance limits which can be stored on the EEPROM. The host | |
22 | * driver or firmware may ensure these are used. | |
23 | * | |
24 | * In addition to all this we provide an extra layer of regulatory | |
25 | * conformance. For drivers which do not have any regulatory | |
26 | * information CRDA provides the complete regulatory solution. | |
27 | * For others it provides a community effort on further restrictions | |
28 | * to enhance compliance. | |
29 | * | |
30 | * Note: When number of rules --> infinity we will not be able to | |
31 | * index on alpha2 any more, instead we'll probably have to | |
32 | * rely on some SHA1 checksum of the regdomain for example. | |
33 | * | |
8318d78a 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> | |
39 | #include <linux/nl80211.h> | |
40 | #include <linux/platform_device.h> | |
b2e1b302 | 41 | #include <net/cfg80211.h> |
8318d78a | 42 | #include "core.h" |
b2e1b302 | 43 | #include "reg.h" |
3b377ea9 | 44 | #include "regdb.h" |
73d54c9e | 45 | #include "nl80211.h" |
8318d78a | 46 | |
4113f751 | 47 | #ifdef CONFIG_CFG80211_REG_DEBUG |
8271195e | 48 | #define REG_DBG_PRINT(format, args...) \ |
4113f751 | 49 | do { \ |
8271195e | 50 | printk(KERN_DEBUG format , ## args); \ |
4113f751 LR |
51 | } while (0) |
52 | #else | |
8271195e | 53 | #define REG_DBG_PRINT(args...) |
4113f751 LR |
54 | #endif |
55 | ||
5166ccd2 | 56 | /* Receipt of information from last regulatory request */ |
f6037d09 | 57 | static struct regulatory_request *last_request; |
734366de | 58 | |
b2e1b302 LR |
59 | /* To trigger userspace events */ |
60 | static struct platform_device *reg_pdev; | |
8318d78a | 61 | |
fb1fc7ad LR |
62 | /* |
63 | * Central wireless core regulatory domains, we only need two, | |
734366de | 64 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
65 | * information to give us an alpha2 |
66 | */ | |
f130347c | 67 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 68 | |
fb1fc7ad LR |
69 | /* |
70 | * We use this as a place for the rd structure built from the | |
3f2355cb | 71 | * last parsed country IE to rest until CRDA gets back to us with |
fb1fc7ad LR |
72 | * what it thinks should apply for the same country |
73 | */ | |
3f2355cb LR |
74 | static const struct ieee80211_regdomain *country_ie_regdomain; |
75 | ||
abc7381b LR |
76 | /* |
77 | * Protects static reg.c components: | |
78 | * - cfg80211_world_regdom | |
79 | * - cfg80211_regdom | |
80 | * - country_ie_regdomain | |
81 | * - last_request | |
82 | */ | |
83 | DEFINE_MUTEX(reg_mutex); | |
84 | #define assert_reg_lock() WARN_ON(!mutex_is_locked(®_mutex)) | |
85 | ||
e38f8a7a | 86 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
87 | static LIST_HEAD(reg_requests_list); |
88 | static spinlock_t reg_requests_lock; | |
89 | ||
e38f8a7a LR |
90 | /* Used to queue up beacon hints for review */ |
91 | static LIST_HEAD(reg_pending_beacons); | |
92 | static spinlock_t reg_pending_beacons_lock; | |
93 | ||
94 | /* Used to keep track of processed beacon hints */ | |
95 | static LIST_HEAD(reg_beacon_list); | |
96 | ||
97 | struct reg_beacon { | |
98 | struct list_head list; | |
99 | struct ieee80211_channel chan; | |
100 | }; | |
101 | ||
734366de JB |
102 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
103 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 104 | .n_reg_rules = 5, |
734366de JB |
105 | .alpha2 = "00", |
106 | .reg_rules = { | |
68798a62 LR |
107 | /* IEEE 802.11b/g, channels 1..11 */ |
108 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
109 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
110 | * channel fits here. */ | |
111 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
112 | NL80211_RRF_PASSIVE_SCAN | |
113 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
114 | /* IEEE 802.11 channel 14 - Only JP enables |
115 | * this and for 802.11b only */ | |
116 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
117 | NL80211_RRF_PASSIVE_SCAN | | |
118 | NL80211_RRF_NO_IBSS | | |
119 | NL80211_RRF_NO_OFDM), | |
120 | /* IEEE 802.11a, channel 36..48 */ | |
ec329ace | 121 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
122 | NL80211_RRF_PASSIVE_SCAN | |
123 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
124 | |
125 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
126 | ||
127 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 128 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
129 | NL80211_RRF_PASSIVE_SCAN | |
130 | NL80211_RRF_NO_IBSS), | |
734366de JB |
131 | } |
132 | }; | |
133 | ||
a3d2eaf0 JB |
134 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
135 | &world_regdom; | |
734366de | 136 | |
6ee7d330 | 137 | static char *ieee80211_regdom = "00"; |
09d989d1 | 138 | static char user_alpha2[2]; |
6ee7d330 | 139 | |
734366de JB |
140 | module_param(ieee80211_regdom, charp, 0444); |
141 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
142 | ||
734366de JB |
143 | static void reset_regdomains(void) |
144 | { | |
942b25cf JB |
145 | /* avoid freeing static information or freeing something twice */ |
146 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
147 | cfg80211_regdomain = NULL; | |
148 | if (cfg80211_world_regdom == &world_regdom) | |
149 | cfg80211_world_regdom = NULL; | |
150 | if (cfg80211_regdomain == &world_regdom) | |
151 | cfg80211_regdomain = NULL; | |
942b25cf JB |
152 | |
153 | kfree(cfg80211_regdomain); | |
154 | kfree(cfg80211_world_regdom); | |
734366de | 155 | |
a3d2eaf0 | 156 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
157 | cfg80211_regdomain = NULL; |
158 | } | |
159 | ||
fb1fc7ad LR |
160 | /* |
161 | * Dynamic world regulatory domain requested by the wireless | |
162 | * core upon initialization | |
163 | */ | |
a3d2eaf0 | 164 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 165 | { |
f6037d09 | 166 | BUG_ON(!last_request); |
734366de JB |
167 | |
168 | reset_regdomains(); | |
169 | ||
170 | cfg80211_world_regdom = rd; | |
171 | cfg80211_regdomain = rd; | |
172 | } | |
734366de | 173 | |
a3d2eaf0 | 174 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
175 | { |
176 | if (!alpha2) | |
177 | return false; | |
178 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
179 | return true; | |
180 | return false; | |
181 | } | |
8318d78a | 182 | |
a3d2eaf0 | 183 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
184 | { |
185 | if (!alpha2) | |
186 | return false; | |
187 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
188 | return true; | |
189 | return false; | |
190 | } | |
8318d78a | 191 | |
b2e1b302 LR |
192 | static bool is_alpha_upper(char letter) |
193 | { | |
194 | /* ASCII A - Z */ | |
195 | if (letter >= 65 && letter <= 90) | |
196 | return true; | |
197 | return false; | |
198 | } | |
8318d78a | 199 | |
a3d2eaf0 | 200 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
201 | { |
202 | if (!alpha2) | |
203 | return false; | |
fb1fc7ad LR |
204 | /* |
205 | * Special case where regulatory domain was built by driver | |
206 | * but a specific alpha2 cannot be determined | |
207 | */ | |
b2e1b302 LR |
208 | if (alpha2[0] == '9' && alpha2[1] == '9') |
209 | return true; | |
210 | return false; | |
211 | } | |
8318d78a | 212 | |
3f2355cb LR |
213 | static bool is_intersected_alpha2(const char *alpha2) |
214 | { | |
215 | if (!alpha2) | |
216 | return false; | |
fb1fc7ad LR |
217 | /* |
218 | * Special case where regulatory domain is the | |
3f2355cb | 219 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
220 | * structures |
221 | */ | |
3f2355cb LR |
222 | if (alpha2[0] == '9' && alpha2[1] == '8') |
223 | return true; | |
224 | return false; | |
225 | } | |
226 | ||
a3d2eaf0 | 227 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
228 | { |
229 | if (!alpha2) | |
230 | return false; | |
231 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
232 | return true; | |
233 | return false; | |
234 | } | |
8318d78a | 235 | |
a3d2eaf0 | 236 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
237 | { |
238 | if (!alpha2_x || !alpha2_y) | |
239 | return false; | |
240 | if (alpha2_x[0] == alpha2_y[0] && | |
241 | alpha2_x[1] == alpha2_y[1]) | |
242 | return true; | |
243 | return false; | |
244 | } | |
245 | ||
69b1572b | 246 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 247 | { |
761cf7ec LR |
248 | assert_cfg80211_lock(); |
249 | ||
b2e1b302 LR |
250 | if (!cfg80211_regdomain) |
251 | return true; | |
252 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
253 | return false; | |
254 | return true; | |
255 | } | |
256 | ||
09d989d1 LR |
257 | /* |
258 | * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets | |
259 | * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER | |
260 | * has ever been issued. | |
261 | */ | |
262 | static bool is_user_regdom_saved(void) | |
263 | { | |
264 | if (user_alpha2[0] == '9' && user_alpha2[1] == '7') | |
265 | return false; | |
266 | ||
267 | /* This would indicate a mistake on the design */ | |
268 | if (WARN((!is_world_regdom(user_alpha2) && | |
269 | !is_an_alpha2(user_alpha2)), | |
270 | "Unexpected user alpha2: %c%c\n", | |
271 | user_alpha2[0], | |
272 | user_alpha2[1])) | |
273 | return false; | |
274 | ||
275 | return true; | |
276 | } | |
277 | ||
3f2355cb LR |
278 | /** |
279 | * country_ie_integrity_changes - tells us if the country IE has changed | |
280 | * @checksum: checksum of country IE of fields we are interested in | |
281 | * | |
282 | * If the country IE has not changed you can ignore it safely. This is | |
283 | * useful to determine if two devices are seeing two different country IEs | |
284 | * even on the same alpha2. Note that this will return false if no IE has | |
285 | * been set on the wireless core yet. | |
286 | */ | |
287 | static bool country_ie_integrity_changes(u32 checksum) | |
288 | { | |
289 | /* If no IE has been set then the checksum doesn't change */ | |
290 | if (unlikely(!last_request->country_ie_checksum)) | |
291 | return false; | |
292 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
293 | return true; | |
294 | return false; | |
295 | } | |
296 | ||
3b377ea9 JL |
297 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
298 | const struct ieee80211_regdomain *src_regd) | |
299 | { | |
300 | struct ieee80211_regdomain *regd; | |
301 | int size_of_regd = 0; | |
302 | unsigned int i; | |
303 | ||
304 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
305 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
306 | ||
307 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
308 | if (!regd) | |
309 | return -ENOMEM; | |
310 | ||
311 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
312 | ||
313 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
314 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
315 | sizeof(struct ieee80211_reg_rule)); | |
316 | ||
317 | *dst_regd = regd; | |
318 | return 0; | |
319 | } | |
320 | ||
321 | #ifdef CONFIG_CFG80211_INTERNAL_REGDB | |
322 | struct reg_regdb_search_request { | |
323 | char alpha2[2]; | |
324 | struct list_head list; | |
325 | }; | |
326 | ||
327 | static LIST_HEAD(reg_regdb_search_list); | |
328 | static DEFINE_SPINLOCK(reg_regdb_search_lock); | |
329 | ||
330 | static void reg_regdb_search(struct work_struct *work) | |
331 | { | |
332 | struct reg_regdb_search_request *request; | |
333 | const struct ieee80211_regdomain *curdom, *regdom; | |
334 | int i, r; | |
335 | ||
336 | spin_lock(®_regdb_search_lock); | |
337 | while (!list_empty(®_regdb_search_list)) { | |
338 | request = list_first_entry(®_regdb_search_list, | |
339 | struct reg_regdb_search_request, | |
340 | list); | |
341 | list_del(&request->list); | |
342 | ||
343 | for (i=0; i<reg_regdb_size; i++) { | |
344 | curdom = reg_regdb[i]; | |
345 | ||
346 | if (!memcmp(request->alpha2, curdom->alpha2, 2)) { | |
347 | r = reg_copy_regd(®dom, curdom); | |
348 | if (r) | |
349 | break; | |
350 | spin_unlock(®_regdb_search_lock); | |
351 | mutex_lock(&cfg80211_mutex); | |
352 | set_regdom(regdom); | |
353 | mutex_unlock(&cfg80211_mutex); | |
354 | spin_lock(®_regdb_search_lock); | |
355 | break; | |
356 | } | |
357 | } | |
358 | ||
359 | kfree(request); | |
360 | } | |
361 | spin_unlock(®_regdb_search_lock); | |
362 | } | |
363 | ||
364 | static DECLARE_WORK(reg_regdb_work, reg_regdb_search); | |
365 | ||
366 | static void reg_regdb_query(const char *alpha2) | |
367 | { | |
368 | struct reg_regdb_search_request *request; | |
369 | ||
370 | if (!alpha2) | |
371 | return; | |
372 | ||
373 | request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL); | |
374 | if (!request) | |
375 | return; | |
376 | ||
377 | memcpy(request->alpha2, alpha2, 2); | |
378 | ||
379 | spin_lock(®_regdb_search_lock); | |
380 | list_add_tail(&request->list, ®_regdb_search_list); | |
381 | spin_unlock(®_regdb_search_lock); | |
382 | ||
383 | schedule_work(®_regdb_work); | |
384 | } | |
385 | #else | |
386 | static inline void reg_regdb_query(const char *alpha2) {} | |
387 | #endif /* CONFIG_CFG80211_INTERNAL_REGDB */ | |
388 | ||
fb1fc7ad LR |
389 | /* |
390 | * This lets us keep regulatory code which is updated on a regulatory | |
391 | * basis in userspace. | |
392 | */ | |
b2e1b302 LR |
393 | static int call_crda(const char *alpha2) |
394 | { | |
395 | char country_env[9 + 2] = "COUNTRY="; | |
396 | char *envp[] = { | |
397 | country_env, | |
398 | NULL | |
399 | }; | |
400 | ||
401 | if (!is_world_regdom((char *) alpha2)) | |
402 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
403 | alpha2[0], alpha2[1]); | |
404 | else | |
b2e1b302 LR |
405 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
406 | "regulatory domain\n"); | |
b2e1b302 | 407 | |
3b377ea9 JL |
408 | /* query internal regulatory database (if it exists) */ |
409 | reg_regdb_query(alpha2); | |
410 | ||
b2e1b302 LR |
411 | country_env[8] = alpha2[0]; |
412 | country_env[9] = alpha2[1]; | |
413 | ||
414 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
415 | } | |
416 | ||
b2e1b302 | 417 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 418 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 419 | { |
61405e97 LR |
420 | assert_cfg80211_lock(); |
421 | ||
f6037d09 JB |
422 | if (!last_request) |
423 | return false; | |
424 | ||
425 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 426 | } |
8318d78a | 427 | |
b2e1b302 | 428 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 429 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 430 | { |
a3d2eaf0 | 431 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
432 | u32 freq_diff; |
433 | ||
91e99004 | 434 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
435 | return false; |
436 | ||
437 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
438 | return false; | |
439 | ||
440 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
441 | ||
bd05f28e RK |
442 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
443 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
444 | return false; |
445 | ||
446 | return true; | |
447 | } | |
448 | ||
a3d2eaf0 | 449 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 450 | { |
a3d2eaf0 | 451 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 452 | unsigned int i; |
8318d78a | 453 | |
b2e1b302 LR |
454 | if (!rd->n_reg_rules) |
455 | return false; | |
8318d78a | 456 | |
88dc1c3f LR |
457 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
458 | return false; | |
459 | ||
b2e1b302 LR |
460 | for (i = 0; i < rd->n_reg_rules; i++) { |
461 | reg_rule = &rd->reg_rules[i]; | |
462 | if (!is_valid_reg_rule(reg_rule)) | |
463 | return false; | |
464 | } | |
465 | ||
466 | return true; | |
8318d78a JB |
467 | } |
468 | ||
038659e7 LR |
469 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, |
470 | u32 center_freq_khz, | |
471 | u32 bw_khz) | |
b2e1b302 | 472 | { |
038659e7 LR |
473 | u32 start_freq_khz, end_freq_khz; |
474 | ||
475 | start_freq_khz = center_freq_khz - (bw_khz/2); | |
476 | end_freq_khz = center_freq_khz + (bw_khz/2); | |
477 | ||
478 | if (start_freq_khz >= freq_range->start_freq_khz && | |
479 | end_freq_khz <= freq_range->end_freq_khz) | |
480 | return true; | |
481 | ||
482 | return false; | |
b2e1b302 | 483 | } |
8318d78a | 484 | |
0c7dc45d LR |
485 | /** |
486 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
487 | * @freq_range: frequency rule we want to query | |
488 | * @freq_khz: frequency we are inquiring about | |
489 | * | |
490 | * This lets us know if a specific frequency rule is or is not relevant to | |
491 | * a specific frequency's band. Bands are device specific and artificial | |
492 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
493 | * safe for now to assume that a frequency rule should not be part of a | |
494 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
495 | * This resolution can be lowered and should be considered as we add | |
496 | * regulatory rule support for other "bands". | |
497 | **/ | |
498 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
499 | u32 freq_khz) | |
500 | { | |
501 | #define ONE_GHZ_IN_KHZ 1000000 | |
502 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
503 | return true; | |
504 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
505 | return true; | |
506 | return false; | |
507 | #undef ONE_GHZ_IN_KHZ | |
508 | } | |
509 | ||
84920e3e LR |
510 | /* |
511 | * This is a work around for sanity checking ieee80211_channel_to_frequency()'s | |
512 | * work. ieee80211_channel_to_frequency() can for example currently provide a | |
513 | * 2 GHz channel when in fact a 5 GHz channel was desired. An example would be | |
514 | * an AP providing channel 8 on a country IE triplet when it sent this on the | |
515 | * 5 GHz band, that channel is designed to be channel 8 on 5 GHz, not a 2 GHz | |
516 | * channel. | |
517 | * | |
518 | * This can be removed once ieee80211_channel_to_frequency() takes in a band. | |
519 | */ | |
520 | static bool chan_in_band(int chan, enum ieee80211_band band) | |
521 | { | |
522 | int center_freq = ieee80211_channel_to_frequency(chan); | |
523 | ||
524 | switch (band) { | |
525 | case IEEE80211_BAND_2GHZ: | |
526 | if (center_freq <= 2484) | |
527 | return true; | |
528 | return false; | |
529 | case IEEE80211_BAND_5GHZ: | |
530 | if (center_freq >= 5005) | |
531 | return true; | |
532 | return false; | |
533 | default: | |
534 | return false; | |
535 | } | |
536 | } | |
537 | ||
cc5d8a37 LR |
538 | /* |
539 | * Some APs may send a country IE triplet for each channel they | |
540 | * support and while this is completely overkill and silly we still | |
541 | * need to support it. We avoid making a single rule for each channel | |
542 | * though and to help us with this we use this helper to find the | |
543 | * actual subband end channel. These type of country IE triplet | |
544 | * scenerios are handled then, all yielding two regulaotry rules from | |
545 | * parsing a country IE: | |
546 | * | |
547 | * [1] | |
548 | * [2] | |
549 | * [36] | |
550 | * [40] | |
551 | * | |
552 | * [1] | |
553 | * [2-4] | |
554 | * [5-12] | |
555 | * [36] | |
556 | * [40-44] | |
557 | * | |
558 | * [1-4] | |
559 | * [5-7] | |
560 | * [36-44] | |
561 | * [48-64] | |
562 | * | |
563 | * [36-36] | |
564 | * [40-40] | |
565 | * [44-44] | |
566 | * [48-48] | |
567 | * [52-52] | |
568 | * [56-56] | |
569 | * [60-60] | |
570 | * [64-64] | |
571 | * [100-100] | |
572 | * [104-104] | |
573 | * [108-108] | |
574 | * [112-112] | |
575 | * [116-116] | |
576 | * [120-120] | |
577 | * [124-124] | |
578 | * [128-128] | |
579 | * [132-132] | |
580 | * [136-136] | |
581 | * [140-140] | |
582 | * | |
583 | * Returns 0 if the IE has been found to be invalid in the middle | |
584 | * somewhere. | |
585 | */ | |
84920e3e LR |
586 | static int max_subband_chan(enum ieee80211_band band, |
587 | int orig_cur_chan, | |
cc5d8a37 LR |
588 | int orig_end_channel, |
589 | s8 orig_max_power, | |
590 | u8 **country_ie, | |
591 | u8 *country_ie_len) | |
592 | { | |
593 | u8 *triplets_start = *country_ie; | |
594 | u8 len_at_triplet = *country_ie_len; | |
595 | int end_subband_chan = orig_end_channel; | |
cc5d8a37 LR |
596 | |
597 | /* | |
598 | * We'll deal with padding for the caller unless | |
599 | * its not immediate and we don't process any channels | |
600 | */ | |
601 | if (*country_ie_len == 1) { | |
602 | *country_ie += 1; | |
603 | *country_ie_len -= 1; | |
604 | return orig_end_channel; | |
605 | } | |
606 | ||
607 | /* Move to the next triplet and then start search */ | |
608 | *country_ie += 3; | |
609 | *country_ie_len -= 3; | |
610 | ||
84920e3e LR |
611 | if (!chan_in_band(orig_cur_chan, band)) |
612 | return 0; | |
cc5d8a37 LR |
613 | |
614 | while (*country_ie_len >= 3) { | |
615 | int end_channel = 0; | |
616 | struct ieee80211_country_ie_triplet *triplet = | |
617 | (struct ieee80211_country_ie_triplet *) *country_ie; | |
618 | int cur_channel = 0, next_expected_chan; | |
cc5d8a37 LR |
619 | |
620 | /* means last triplet is completely unrelated to this one */ | |
621 | if (triplet->ext.reg_extension_id >= | |
622 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
623 | *country_ie -= 3; | |
624 | *country_ie_len += 3; | |
625 | break; | |
626 | } | |
627 | ||
628 | if (triplet->chans.first_channel == 0) { | |
629 | *country_ie += 1; | |
630 | *country_ie_len -= 1; | |
631 | if (*country_ie_len != 0) | |
632 | return 0; | |
633 | break; | |
634 | } | |
635 | ||
a0f2e0fc LR |
636 | if (triplet->chans.num_channels == 0) |
637 | return 0; | |
638 | ||
cc5d8a37 LR |
639 | /* Monitonically increasing channel order */ |
640 | if (triplet->chans.first_channel <= end_subband_chan) | |
641 | return 0; | |
642 | ||
84920e3e LR |
643 | if (!chan_in_band(triplet->chans.first_channel, band)) |
644 | return 0; | |
645 | ||
cc5d8a37 LR |
646 | /* 2 GHz */ |
647 | if (triplet->chans.first_channel <= 14) { | |
648 | end_channel = triplet->chans.first_channel + | |
649 | triplet->chans.num_channels - 1; | |
650 | } | |
651 | else { | |
652 | end_channel = triplet->chans.first_channel + | |
653 | (4 * (triplet->chans.num_channels - 1)); | |
cc5d8a37 LR |
654 | } |
655 | ||
84920e3e LR |
656 | if (!chan_in_band(end_channel, band)) |
657 | return 0; | |
cc5d8a37 LR |
658 | |
659 | if (orig_max_power != triplet->chans.max_power) { | |
660 | *country_ie -= 3; | |
661 | *country_ie_len += 3; | |
662 | break; | |
663 | } | |
664 | ||
665 | cur_channel = triplet->chans.first_channel; | |
666 | ||
667 | /* The key is finding the right next expected channel */ | |
668 | if (band == IEEE80211_BAND_2GHZ) | |
669 | next_expected_chan = end_subband_chan + 1; | |
670 | else | |
671 | next_expected_chan = end_subband_chan + 4; | |
672 | ||
673 | if (cur_channel != next_expected_chan) { | |
674 | *country_ie -= 3; | |
675 | *country_ie_len += 3; | |
676 | break; | |
677 | } | |
678 | ||
679 | end_subband_chan = end_channel; | |
680 | ||
681 | /* Move to the next one */ | |
682 | *country_ie += 3; | |
683 | *country_ie_len -= 3; | |
684 | ||
685 | /* | |
686 | * Padding needs to be dealt with if we processed | |
687 | * some channels. | |
688 | */ | |
689 | if (*country_ie_len == 1) { | |
690 | *country_ie += 1; | |
691 | *country_ie_len -= 1; | |
692 | break; | |
693 | } | |
694 | ||
695 | /* If seen, the IE is invalid */ | |
696 | if (*country_ie_len == 2) | |
697 | return 0; | |
698 | } | |
699 | ||
700 | if (end_subband_chan == orig_end_channel) { | |
701 | *country_ie = triplets_start; | |
702 | *country_ie_len = len_at_triplet; | |
703 | return orig_end_channel; | |
704 | } | |
705 | ||
706 | return end_subband_chan; | |
707 | } | |
708 | ||
fb1fc7ad LR |
709 | /* |
710 | * Converts a country IE to a regulatory domain. A regulatory domain | |
3f2355cb LR |
711 | * structure has a lot of information which the IE doesn't yet have, |
712 | * so for the other values we use upper max values as we will intersect | |
fb1fc7ad LR |
713 | * with our userspace regulatory agent to get lower bounds. |
714 | */ | |
3f2355cb | 715 | static struct ieee80211_regdomain *country_ie_2_rd( |
84920e3e | 716 | enum ieee80211_band band, |
3f2355cb LR |
717 | u8 *country_ie, |
718 | u8 country_ie_len, | |
719 | u32 *checksum) | |
720 | { | |
721 | struct ieee80211_regdomain *rd = NULL; | |
722 | unsigned int i = 0; | |
723 | char alpha2[2]; | |
724 | u32 flags = 0; | |
725 | u32 num_rules = 0, size_of_regd = 0; | |
726 | u8 *triplets_start = NULL; | |
727 | u8 len_at_triplet = 0; | |
728 | /* the last channel we have registered in a subband (triplet) */ | |
729 | int last_sub_max_channel = 0; | |
730 | ||
731 | *checksum = 0xDEADBEEF; | |
732 | ||
733 | /* Country IE requirements */ | |
734 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
735 | country_ie_len & 0x01); | |
736 | ||
737 | alpha2[0] = country_ie[0]; | |
738 | alpha2[1] = country_ie[1]; | |
739 | ||
740 | /* | |
741 | * Third octet can be: | |
742 | * 'I' - Indoor | |
743 | * 'O' - Outdoor | |
744 | * | |
745 | * anything else we assume is no restrictions | |
746 | */ | |
747 | if (country_ie[2] == 'I') | |
748 | flags = NL80211_RRF_NO_OUTDOOR; | |
749 | else if (country_ie[2] == 'O') | |
750 | flags = NL80211_RRF_NO_INDOOR; | |
751 | ||
752 | country_ie += 3; | |
753 | country_ie_len -= 3; | |
754 | ||
755 | triplets_start = country_ie; | |
756 | len_at_triplet = country_ie_len; | |
757 | ||
758 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
759 | ||
fb1fc7ad LR |
760 | /* |
761 | * We need to build a reg rule for each triplet, but first we must | |
3f2355cb | 762 | * calculate the number of reg rules we will need. We will need one |
fb1fc7ad LR |
763 | * for each channel subband |
764 | */ | |
3f2355cb | 765 | while (country_ie_len >= 3) { |
615aab4b | 766 | int end_channel = 0; |
3f2355cb LR |
767 | struct ieee80211_country_ie_triplet *triplet = |
768 | (struct ieee80211_country_ie_triplet *) country_ie; | |
769 | int cur_sub_max_channel = 0, cur_channel = 0; | |
770 | ||
771 | if (triplet->ext.reg_extension_id >= | |
772 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
773 | country_ie += 3; | |
774 | country_ie_len -= 3; | |
775 | continue; | |
776 | } | |
777 | ||
cc5d8a37 LR |
778 | /* |
779 | * APs can add padding to make length divisible | |
780 | * by two, required by the spec. | |
781 | */ | |
782 | if (triplet->chans.first_channel == 0) { | |
783 | country_ie++; | |
784 | country_ie_len--; | |
785 | /* This is expected to be at the very end only */ | |
786 | if (country_ie_len != 0) | |
787 | return NULL; | |
788 | break; | |
789 | } | |
790 | ||
a0f2e0fc LR |
791 | if (triplet->chans.num_channels == 0) |
792 | return NULL; | |
793 | ||
84920e3e LR |
794 | if (!chan_in_band(triplet->chans.first_channel, band)) |
795 | return NULL; | |
796 | ||
615aab4b | 797 | /* 2 GHz */ |
84920e3e | 798 | if (band == IEEE80211_BAND_2GHZ) |
615aab4b | 799 | end_channel = triplet->chans.first_channel + |
e99c7cd5 | 800 | triplet->chans.num_channels - 1; |
615aab4b LR |
801 | else |
802 | /* | |
803 | * 5 GHz -- For example in country IEs if the first | |
804 | * channel given is 36 and the number of channels is 4 | |
805 | * then the individual channel numbers defined for the | |
806 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
807 | * and not 36, 37, 38, 39. | |
808 | * | |
809 | * See: http://tinyurl.com/11d-clarification | |
810 | */ | |
811 | end_channel = triplet->chans.first_channel + | |
812 | (4 * (triplet->chans.num_channels - 1)); | |
813 | ||
3f2355cb | 814 | cur_channel = triplet->chans.first_channel; |
cc5d8a37 LR |
815 | |
816 | /* | |
817 | * Enhancement for APs that send a triplet for every channel | |
818 | * or for whatever reason sends triplets with multiple channels | |
819 | * separated when in fact they should be together. | |
820 | */ | |
84920e3e LR |
821 | end_channel = max_subband_chan(band, |
822 | cur_channel, | |
cc5d8a37 LR |
823 | end_channel, |
824 | triplet->chans.max_power, | |
825 | &country_ie, | |
826 | &country_ie_len); | |
827 | if (!end_channel) | |
828 | return NULL; | |
829 | ||
84920e3e LR |
830 | if (!chan_in_band(end_channel, band)) |
831 | return NULL; | |
832 | ||
615aab4b | 833 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
834 | |
835 | /* Basic sanity check */ | |
836 | if (cur_sub_max_channel < cur_channel) | |
837 | return NULL; | |
838 | ||
fb1fc7ad LR |
839 | /* |
840 | * Do not allow overlapping channels. Also channels | |
3f2355cb | 841 | * passed in each subband must be monotonically |
fb1fc7ad LR |
842 | * increasing |
843 | */ | |
3f2355cb LR |
844 | if (last_sub_max_channel) { |
845 | if (cur_channel <= last_sub_max_channel) | |
846 | return NULL; | |
847 | if (cur_sub_max_channel <= last_sub_max_channel) | |
848 | return NULL; | |
849 | } | |
850 | ||
fb1fc7ad LR |
851 | /* |
852 | * When dot11RegulatoryClassesRequired is supported | |
3f2355cb LR |
853 | * we can throw ext triplets as part of this soup, |
854 | * for now we don't care when those change as we | |
fb1fc7ad LR |
855 | * don't support them |
856 | */ | |
3f2355cb LR |
857 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | |
858 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
859 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
860 | ||
861 | last_sub_max_channel = cur_sub_max_channel; | |
862 | ||
3f2355cb LR |
863 | num_rules++; |
864 | ||
cc5d8a37 LR |
865 | if (country_ie_len >= 3) { |
866 | country_ie += 3; | |
867 | country_ie_len -= 3; | |
868 | } | |
869 | ||
fb1fc7ad LR |
870 | /* |
871 | * Note: this is not a IEEE requirement but | |
872 | * simply a memory requirement | |
873 | */ | |
3f2355cb LR |
874 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) |
875 | return NULL; | |
876 | } | |
877 | ||
878 | country_ie = triplets_start; | |
879 | country_ie_len = len_at_triplet; | |
880 | ||
881 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
882 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
883 | ||
884 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
885 | if (!rd) | |
886 | return NULL; | |
887 | ||
888 | rd->n_reg_rules = num_rules; | |
889 | rd->alpha2[0] = alpha2[0]; | |
890 | rd->alpha2[1] = alpha2[1]; | |
891 | ||
892 | /* This time around we fill in the rd */ | |
893 | while (country_ie_len >= 3) { | |
02e68a3d | 894 | int end_channel = 0; |
3f2355cb LR |
895 | struct ieee80211_country_ie_triplet *triplet = |
896 | (struct ieee80211_country_ie_triplet *) country_ie; | |
897 | struct ieee80211_reg_rule *reg_rule = NULL; | |
898 | struct ieee80211_freq_range *freq_range = NULL; | |
899 | struct ieee80211_power_rule *power_rule = NULL; | |
900 | ||
fb1fc7ad LR |
901 | /* |
902 | * Must parse if dot11RegulatoryClassesRequired is true, | |
903 | * we don't support this yet | |
904 | */ | |
3f2355cb LR |
905 | if (triplet->ext.reg_extension_id >= |
906 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
907 | country_ie += 3; | |
908 | country_ie_len -= 3; | |
909 | continue; | |
910 | } | |
911 | ||
cc5d8a37 LR |
912 | if (triplet->chans.first_channel == 0) { |
913 | country_ie++; | |
914 | country_ie_len--; | |
915 | break; | |
916 | } | |
917 | ||
3f2355cb LR |
918 | reg_rule = &rd->reg_rules[i]; |
919 | freq_range = ®_rule->freq_range; | |
920 | power_rule = ®_rule->power_rule; | |
921 | ||
922 | reg_rule->flags = flags; | |
923 | ||
02e68a3d | 924 | /* 2 GHz */ |
84920e3e | 925 | if (band == IEEE80211_BAND_2GHZ) |
02e68a3d | 926 | end_channel = triplet->chans.first_channel + |
e99c7cd5 | 927 | triplet->chans.num_channels -1; |
02e68a3d | 928 | else |
02e68a3d LR |
929 | end_channel = triplet->chans.first_channel + |
930 | (4 * (triplet->chans.num_channels - 1)); | |
931 | ||
84920e3e LR |
932 | end_channel = max_subband_chan(band, |
933 | triplet->chans.first_channel, | |
cc5d8a37 LR |
934 | end_channel, |
935 | triplet->chans.max_power, | |
936 | &country_ie, | |
937 | &country_ie_len); | |
938 | ||
fb1fc7ad LR |
939 | /* |
940 | * The +10 is since the regulatory domain expects | |
3f2355cb LR |
941 | * the actual band edge, not the center of freq for |
942 | * its start and end freqs, assuming 20 MHz bandwidth on | |
fb1fc7ad LR |
943 | * the channels passed |
944 | */ | |
3f2355cb LR |
945 | freq_range->start_freq_khz = |
946 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
947 | triplet->chans.first_channel) - 10); | |
948 | freq_range->end_freq_khz = | |
949 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 950 | end_channel) + 10); |
3f2355cb | 951 | |
fb1fc7ad LR |
952 | /* |
953 | * These are large arbitrary values we use to intersect later. | |
954 | * Increment this if we ever support >= 40 MHz channels | |
955 | * in IEEE 802.11 | |
956 | */ | |
3f2355cb LR |
957 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); |
958 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
08030db6 | 959 | power_rule->max_eirp = DBM_TO_MBM(triplet->chans.max_power); |
3f2355cb | 960 | |
3f2355cb LR |
961 | i++; |
962 | ||
cc5d8a37 LR |
963 | if (country_ie_len >= 3) { |
964 | country_ie += 3; | |
965 | country_ie_len -= 3; | |
966 | } | |
967 | ||
3f2355cb LR |
968 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); |
969 | } | |
970 | ||
971 | return rd; | |
972 | } | |
973 | ||
974 | ||
fb1fc7ad LR |
975 | /* |
976 | * Helper for regdom_intersect(), this does the real | |
977 | * mathematical intersection fun | |
978 | */ | |
9c96477d LR |
979 | static int reg_rules_intersect( |
980 | const struct ieee80211_reg_rule *rule1, | |
981 | const struct ieee80211_reg_rule *rule2, | |
982 | struct ieee80211_reg_rule *intersected_rule) | |
983 | { | |
984 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
985 | struct ieee80211_freq_range *freq_range; | |
986 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
987 | struct ieee80211_power_rule *power_rule; | |
988 | u32 freq_diff; | |
989 | ||
990 | freq_range1 = &rule1->freq_range; | |
991 | freq_range2 = &rule2->freq_range; | |
992 | freq_range = &intersected_rule->freq_range; | |
993 | ||
994 | power_rule1 = &rule1->power_rule; | |
995 | power_rule2 = &rule2->power_rule; | |
996 | power_rule = &intersected_rule->power_rule; | |
997 | ||
998 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
999 | freq_range2->start_freq_khz); | |
1000 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
1001 | freq_range2->end_freq_khz); | |
1002 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
1003 | freq_range2->max_bandwidth_khz); | |
1004 | ||
1005 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
1006 | if (freq_range->max_bandwidth_khz > freq_diff) | |
1007 | freq_range->max_bandwidth_khz = freq_diff; | |
1008 | ||
1009 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
1010 | power_rule2->max_eirp); | |
1011 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
1012 | power_rule2->max_antenna_gain); | |
1013 | ||
1014 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
1015 | ||
1016 | if (!is_valid_reg_rule(intersected_rule)) | |
1017 | return -EINVAL; | |
1018 | ||
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * regdom_intersect - do the intersection between two regulatory domains | |
1024 | * @rd1: first regulatory domain | |
1025 | * @rd2: second regulatory domain | |
1026 | * | |
1027 | * Use this function to get the intersection between two regulatory domains. | |
1028 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
1029 | * as no one single alpha2 can represent this regulatory domain. | |
1030 | * | |
1031 | * Returns a pointer to the regulatory domain structure which will hold the | |
1032 | * resulting intersection of rules between rd1 and rd2. We will | |
1033 | * kzalloc() this structure for you. | |
1034 | */ | |
1035 | static struct ieee80211_regdomain *regdom_intersect( | |
1036 | const struct ieee80211_regdomain *rd1, | |
1037 | const struct ieee80211_regdomain *rd2) | |
1038 | { | |
1039 | int r, size_of_regd; | |
1040 | unsigned int x, y; | |
1041 | unsigned int num_rules = 0, rule_idx = 0; | |
1042 | const struct ieee80211_reg_rule *rule1, *rule2; | |
1043 | struct ieee80211_reg_rule *intersected_rule; | |
1044 | struct ieee80211_regdomain *rd; | |
1045 | /* This is just a dummy holder to help us count */ | |
1046 | struct ieee80211_reg_rule irule; | |
1047 | ||
1048 | /* Uses the stack temporarily for counter arithmetic */ | |
1049 | intersected_rule = &irule; | |
1050 | ||
1051 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
1052 | ||
1053 | if (!rd1 || !rd2) | |
1054 | return NULL; | |
1055 | ||
fb1fc7ad LR |
1056 | /* |
1057 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
1058 | * build them. This is to so we can malloc() and free() a |
1059 | * regdomain once. The reason we use reg_rules_intersect() here | |
1060 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
1061 | * All rules that do check out OK are valid. |
1062 | */ | |
9c96477d LR |
1063 | |
1064 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
1065 | rule1 = &rd1->reg_rules[x]; | |
1066 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
1067 | rule2 = &rd2->reg_rules[y]; | |
1068 | if (!reg_rules_intersect(rule1, rule2, | |
1069 | intersected_rule)) | |
1070 | num_rules++; | |
1071 | memset(intersected_rule, 0, | |
1072 | sizeof(struct ieee80211_reg_rule)); | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | if (!num_rules) | |
1077 | return NULL; | |
1078 | ||
1079 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1080 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
1081 | ||
1082 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
1083 | if (!rd) | |
1084 | return NULL; | |
1085 | ||
1086 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
1087 | rule1 = &rd1->reg_rules[x]; | |
1088 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
1089 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
1090 | /* |
1091 | * This time around instead of using the stack lets | |
9c96477d | 1092 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
1093 | * a memcpy() |
1094 | */ | |
9c96477d LR |
1095 | intersected_rule = &rd->reg_rules[rule_idx]; |
1096 | r = reg_rules_intersect(rule1, rule2, | |
1097 | intersected_rule); | |
fb1fc7ad LR |
1098 | /* |
1099 | * No need to memset here the intersected rule here as | |
1100 | * we're not using the stack anymore | |
1101 | */ | |
9c96477d LR |
1102 | if (r) |
1103 | continue; | |
1104 | rule_idx++; | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | if (rule_idx != num_rules) { | |
1109 | kfree(rd); | |
1110 | return NULL; | |
1111 | } | |
1112 | ||
1113 | rd->n_reg_rules = num_rules; | |
1114 | rd->alpha2[0] = '9'; | |
1115 | rd->alpha2[1] = '8'; | |
1116 | ||
1117 | return rd; | |
1118 | } | |
1119 | ||
fb1fc7ad LR |
1120 | /* |
1121 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
1122 | * want to just have the channel structure use these | |
1123 | */ | |
b2e1b302 LR |
1124 | static u32 map_regdom_flags(u32 rd_flags) |
1125 | { | |
1126 | u32 channel_flags = 0; | |
1127 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
1128 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
1129 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
1130 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
1131 | if (rd_flags & NL80211_RRF_DFS) | |
1132 | channel_flags |= IEEE80211_CHAN_RADAR; | |
1133 | return channel_flags; | |
1134 | } | |
1135 | ||
1fa25e41 LR |
1136 | static int freq_reg_info_regd(struct wiphy *wiphy, |
1137 | u32 center_freq, | |
038659e7 | 1138 | u32 desired_bw_khz, |
1fa25e41 LR |
1139 | const struct ieee80211_reg_rule **reg_rule, |
1140 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
1141 | { |
1142 | int i; | |
0c7dc45d | 1143 | bool band_rule_found = false; |
3e0c3ff3 | 1144 | const struct ieee80211_regdomain *regd; |
038659e7 LR |
1145 | bool bw_fits = false; |
1146 | ||
1147 | if (!desired_bw_khz) | |
1148 | desired_bw_khz = MHZ_TO_KHZ(20); | |
8318d78a | 1149 | |
1fa25e41 | 1150 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 1151 | |
fb1fc7ad LR |
1152 | /* |
1153 | * Follow the driver's regulatory domain, if present, unless a country | |
1154 | * IE has been processed or a user wants to help complaince further | |
1155 | */ | |
7db90f4a LR |
1156 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
1157 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && | |
3e0c3ff3 LR |
1158 | wiphy->regd) |
1159 | regd = wiphy->regd; | |
1160 | ||
1161 | if (!regd) | |
b2e1b302 LR |
1162 | return -EINVAL; |
1163 | ||
3e0c3ff3 | 1164 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
1165 | const struct ieee80211_reg_rule *rr; |
1166 | const struct ieee80211_freq_range *fr = NULL; | |
1167 | const struct ieee80211_power_rule *pr = NULL; | |
1168 | ||
3e0c3ff3 | 1169 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
1170 | fr = &rr->freq_range; |
1171 | pr = &rr->power_rule; | |
0c7dc45d | 1172 | |
fb1fc7ad LR |
1173 | /* |
1174 | * We only need to know if one frequency rule was | |
0c7dc45d | 1175 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
1176 | * not overwrite it once found |
1177 | */ | |
0c7dc45d LR |
1178 | if (!band_rule_found) |
1179 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
1180 | ||
038659e7 LR |
1181 | bw_fits = reg_does_bw_fit(fr, |
1182 | center_freq, | |
1183 | desired_bw_khz); | |
0c7dc45d | 1184 | |
038659e7 | 1185 | if (band_rule_found && bw_fits) { |
b2e1b302 | 1186 | *reg_rule = rr; |
038659e7 | 1187 | return 0; |
8318d78a JB |
1188 | } |
1189 | } | |
1190 | ||
0c7dc45d LR |
1191 | if (!band_rule_found) |
1192 | return -ERANGE; | |
1193 | ||
038659e7 | 1194 | return -EINVAL; |
b2e1b302 | 1195 | } |
34f57347 | 1196 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 1197 | |
038659e7 LR |
1198 | int freq_reg_info(struct wiphy *wiphy, |
1199 | u32 center_freq, | |
1200 | u32 desired_bw_khz, | |
1201 | const struct ieee80211_reg_rule **reg_rule) | |
1fa25e41 | 1202 | { |
ac46d48e | 1203 | assert_cfg80211_lock(); |
038659e7 LR |
1204 | return freq_reg_info_regd(wiphy, |
1205 | center_freq, | |
1206 | desired_bw_khz, | |
1207 | reg_rule, | |
1208 | NULL); | |
1fa25e41 | 1209 | } |
b2e1b302 | 1210 | |
038659e7 LR |
1211 | /* |
1212 | * Note that right now we assume the desired channel bandwidth | |
1213 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz | |
1214 | * per channel, the primary and the extension channel). To support | |
1215 | * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a | |
1216 | * new ieee80211_channel.target_bw and re run the regulatory check | |
1217 | * on the wiphy with the target_bw specified. Then we can simply use | |
1218 | * that below for the desired_bw_khz below. | |
1219 | */ | |
a92a3ce7 LR |
1220 | static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, |
1221 | unsigned int chan_idx) | |
b2e1b302 LR |
1222 | { |
1223 | int r; | |
038659e7 LR |
1224 | u32 flags, bw_flags = 0; |
1225 | u32 desired_bw_khz = MHZ_TO_KHZ(20); | |
b2e1b302 LR |
1226 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1227 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 1228 | const struct ieee80211_freq_range *freq_range = NULL; |
a92a3ce7 LR |
1229 | struct ieee80211_supported_band *sband; |
1230 | struct ieee80211_channel *chan; | |
fe33eb39 | 1231 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 1232 | |
761cf7ec LR |
1233 | assert_cfg80211_lock(); |
1234 | ||
806a9e39 LR |
1235 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1236 | ||
a92a3ce7 LR |
1237 | sband = wiphy->bands[band]; |
1238 | BUG_ON(chan_idx >= sband->n_channels); | |
1239 | chan = &sband->channels[chan_idx]; | |
1240 | ||
1241 | flags = chan->orig_flags; | |
b2e1b302 | 1242 | |
038659e7 LR |
1243 | r = freq_reg_info(wiphy, |
1244 | MHZ_TO_KHZ(chan->center_freq), | |
1245 | desired_bw_khz, | |
1246 | ®_rule); | |
b2e1b302 LR |
1247 | |
1248 | if (r) { | |
fb1fc7ad LR |
1249 | /* |
1250 | * This means no regulatory rule was found in the country IE | |
0c7dc45d LR |
1251 | * with a frequency range on the center_freq's band, since |
1252 | * IEEE-802.11 allows for a country IE to have a subset of the | |
1253 | * regulatory information provided in a country we ignore | |
1254 | * disabling the channel unless at least one reg rule was | |
1255 | * found on the center_freq's band. For details see this | |
1256 | * clarification: | |
1257 | * | |
1258 | * http://tinyurl.com/11d-clarification | |
1259 | */ | |
1260 | if (r == -ERANGE && | |
7db90f4a LR |
1261 | last_request->initiator == |
1262 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
4113f751 | 1263 | REG_DBG_PRINT("cfg80211: Leaving channel %d MHz " |
0c7dc45d LR |
1264 | "intact on %s - no rule found in band on " |
1265 | "Country IE\n", | |
4113f751 | 1266 | chan->center_freq, wiphy_name(wiphy)); |
0c7dc45d | 1267 | } else { |
fb1fc7ad LR |
1268 | /* |
1269 | * In this case we know the country IE has at least one reg rule | |
1270 | * for the band so we respect its band definitions | |
1271 | */ | |
7db90f4a LR |
1272 | if (last_request->initiator == |
1273 | NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
4113f751 | 1274 | REG_DBG_PRINT("cfg80211: Disabling " |
0c7dc45d LR |
1275 | "channel %d MHz on %s due to " |
1276 | "Country IE\n", | |
1277 | chan->center_freq, wiphy_name(wiphy)); | |
0c7dc45d LR |
1278 | flags |= IEEE80211_CHAN_DISABLED; |
1279 | chan->flags = flags; | |
1280 | } | |
8318d78a JB |
1281 | return; |
1282 | } | |
1283 | ||
b2e1b302 | 1284 | power_rule = ®_rule->power_rule; |
038659e7 LR |
1285 | freq_range = ®_rule->freq_range; |
1286 | ||
1287 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1288 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
b2e1b302 | 1289 | |
7db90f4a | 1290 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
806a9e39 | 1291 | request_wiphy && request_wiphy == wiphy && |
5be83de5 | 1292 | request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
fb1fc7ad LR |
1293 | /* |
1294 | * This gaurantees the driver's requested regulatory domain | |
f976376d | 1295 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
1296 | * settings |
1297 | */ | |
f976376d | 1298 | chan->flags = chan->orig_flags = |
038659e7 | 1299 | map_regdom_flags(reg_rule->flags) | bw_flags; |
f976376d LR |
1300 | chan->max_antenna_gain = chan->orig_mag = |
1301 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
f976376d LR |
1302 | chan->max_power = chan->orig_mpwr = |
1303 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
1304 | return; | |
1305 | } | |
1306 | ||
038659e7 | 1307 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 1308 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 | 1309 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
253898c4 | 1310 | if (chan->orig_mpwr) |
b2e1b302 LR |
1311 | chan->max_power = min(chan->orig_mpwr, |
1312 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 1313 | else |
b2e1b302 | 1314 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
1315 | } |
1316 | ||
a92a3ce7 | 1317 | static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) |
8318d78a | 1318 | { |
a92a3ce7 LR |
1319 | unsigned int i; |
1320 | struct ieee80211_supported_band *sband; | |
1321 | ||
1322 | BUG_ON(!wiphy->bands[band]); | |
1323 | sband = wiphy->bands[band]; | |
8318d78a JB |
1324 | |
1325 | for (i = 0; i < sband->n_channels; i++) | |
a92a3ce7 | 1326 | handle_channel(wiphy, band, i); |
8318d78a JB |
1327 | } |
1328 | ||
7db90f4a LR |
1329 | static bool ignore_reg_update(struct wiphy *wiphy, |
1330 | enum nl80211_reg_initiator initiator) | |
14b9815a LR |
1331 | { |
1332 | if (!last_request) | |
1333 | return true; | |
7db90f4a | 1334 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
5be83de5 | 1335 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) |
14b9815a | 1336 | return true; |
fb1fc7ad LR |
1337 | /* |
1338 | * wiphy->regd will be set once the device has its own | |
1339 | * desired regulatory domain set | |
1340 | */ | |
5be83de5 | 1341 | if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && |
f976376d | 1342 | !is_world_regdom(last_request->alpha2)) |
14b9815a LR |
1343 | return true; |
1344 | return false; | |
1345 | } | |
1346 | ||
7db90f4a | 1347 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
8318d78a | 1348 | { |
79c97e97 | 1349 | struct cfg80211_registered_device *rdev; |
8318d78a | 1350 | |
79c97e97 JB |
1351 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1352 | wiphy_update_regulatory(&rdev->wiphy, initiator); | |
b2e1b302 LR |
1353 | } |
1354 | ||
e38f8a7a LR |
1355 | static void handle_reg_beacon(struct wiphy *wiphy, |
1356 | unsigned int chan_idx, | |
1357 | struct reg_beacon *reg_beacon) | |
1358 | { | |
e38f8a7a LR |
1359 | struct ieee80211_supported_band *sband; |
1360 | struct ieee80211_channel *chan; | |
6bad8766 LR |
1361 | bool channel_changed = false; |
1362 | struct ieee80211_channel chan_before; | |
e38f8a7a LR |
1363 | |
1364 | assert_cfg80211_lock(); | |
1365 | ||
1366 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1367 | chan = &sband->channels[chan_idx]; | |
1368 | ||
1369 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
1370 | return; | |
1371 | ||
6bad8766 LR |
1372 | if (chan->beacon_found) |
1373 | return; | |
1374 | ||
1375 | chan->beacon_found = true; | |
1376 | ||
5be83de5 | 1377 | if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) |
37184244 LR |
1378 | return; |
1379 | ||
6bad8766 LR |
1380 | chan_before.center_freq = chan->center_freq; |
1381 | chan_before.flags = chan->flags; | |
1382 | ||
37184244 | 1383 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { |
e38f8a7a | 1384 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; |
6bad8766 | 1385 | channel_changed = true; |
e38f8a7a LR |
1386 | } |
1387 | ||
37184244 | 1388 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { |
e38f8a7a | 1389 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; |
6bad8766 | 1390 | channel_changed = true; |
e38f8a7a LR |
1391 | } |
1392 | ||
6bad8766 LR |
1393 | if (channel_changed) |
1394 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
e38f8a7a LR |
1395 | } |
1396 | ||
1397 | /* | |
1398 | * Called when a scan on a wiphy finds a beacon on | |
1399 | * new channel | |
1400 | */ | |
1401 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
1402 | struct reg_beacon *reg_beacon) | |
1403 | { | |
1404 | unsigned int i; | |
1405 | struct ieee80211_supported_band *sband; | |
1406 | ||
1407 | assert_cfg80211_lock(); | |
1408 | ||
1409 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1410 | return; | |
1411 | ||
1412 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1413 | ||
1414 | for (i = 0; i < sband->n_channels; i++) | |
1415 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * Called upon reg changes or a new wiphy is added | |
1420 | */ | |
1421 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1422 | { | |
1423 | unsigned int i; | |
1424 | struct ieee80211_supported_band *sband; | |
1425 | struct reg_beacon *reg_beacon; | |
1426 | ||
1427 | assert_cfg80211_lock(); | |
1428 | ||
1429 | if (list_empty(®_beacon_list)) | |
1430 | return; | |
1431 | ||
1432 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1433 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1434 | continue; | |
1435 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1436 | for (i = 0; i < sband->n_channels; i++) | |
1437 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1442 | { | |
1443 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1444 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1445 | return true; | |
b1ed8ddd LR |
1446 | if (last_request && |
1447 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
5be83de5 | 1448 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) |
e38f8a7a LR |
1449 | return true; |
1450 | return false; | |
1451 | } | |
1452 | ||
1453 | /* Reap the advantages of previously found beacons */ | |
1454 | static void reg_process_beacons(struct wiphy *wiphy) | |
1455 | { | |
b1ed8ddd LR |
1456 | /* |
1457 | * Means we are just firing up cfg80211, so no beacons would | |
1458 | * have been processed yet. | |
1459 | */ | |
1460 | if (!last_request) | |
1461 | return; | |
e38f8a7a LR |
1462 | if (!reg_is_world_roaming(wiphy)) |
1463 | return; | |
1464 | wiphy_update_beacon_reg(wiphy); | |
1465 | } | |
1466 | ||
038659e7 LR |
1467 | static bool is_ht40_not_allowed(struct ieee80211_channel *chan) |
1468 | { | |
1469 | if (!chan) | |
1470 | return true; | |
1471 | if (chan->flags & IEEE80211_CHAN_DISABLED) | |
1472 | return true; | |
1473 | /* This would happen when regulatory rules disallow HT40 completely */ | |
1474 | if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) | |
1475 | return true; | |
1476 | return false; | |
1477 | } | |
1478 | ||
1479 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, | |
1480 | enum ieee80211_band band, | |
1481 | unsigned int chan_idx) | |
1482 | { | |
1483 | struct ieee80211_supported_band *sband; | |
1484 | struct ieee80211_channel *channel; | |
1485 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; | |
1486 | unsigned int i; | |
1487 | ||
1488 | assert_cfg80211_lock(); | |
1489 | ||
1490 | sband = wiphy->bands[band]; | |
1491 | BUG_ON(chan_idx >= sband->n_channels); | |
1492 | channel = &sband->channels[chan_idx]; | |
1493 | ||
1494 | if (is_ht40_not_allowed(channel)) { | |
1495 | channel->flags |= IEEE80211_CHAN_NO_HT40; | |
1496 | return; | |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * We need to ensure the extension channels exist to | |
1501 | * be able to use HT40- or HT40+, this finds them (or not) | |
1502 | */ | |
1503 | for (i = 0; i < sband->n_channels; i++) { | |
1504 | struct ieee80211_channel *c = &sband->channels[i]; | |
1505 | if (c->center_freq == (channel->center_freq - 20)) | |
1506 | channel_before = c; | |
1507 | if (c->center_freq == (channel->center_freq + 20)) | |
1508 | channel_after = c; | |
1509 | } | |
1510 | ||
1511 | /* | |
1512 | * Please note that this assumes target bandwidth is 20 MHz, | |
1513 | * if that ever changes we also need to change the below logic | |
1514 | * to include that as well. | |
1515 | */ | |
1516 | if (is_ht40_not_allowed(channel_before)) | |
689da1b3 | 1517 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 | 1518 | else |
689da1b3 | 1519 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 LR |
1520 | |
1521 | if (is_ht40_not_allowed(channel_after)) | |
689da1b3 | 1522 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 | 1523 | else |
689da1b3 | 1524 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 LR |
1525 | } |
1526 | ||
1527 | static void reg_process_ht_flags_band(struct wiphy *wiphy, | |
1528 | enum ieee80211_band band) | |
1529 | { | |
1530 | unsigned int i; | |
1531 | struct ieee80211_supported_band *sband; | |
1532 | ||
1533 | BUG_ON(!wiphy->bands[band]); | |
1534 | sband = wiphy->bands[band]; | |
1535 | ||
1536 | for (i = 0; i < sband->n_channels; i++) | |
1537 | reg_process_ht_flags_channel(wiphy, band, i); | |
1538 | } | |
1539 | ||
1540 | static void reg_process_ht_flags(struct wiphy *wiphy) | |
1541 | { | |
1542 | enum ieee80211_band band; | |
1543 | ||
1544 | if (!wiphy) | |
1545 | return; | |
1546 | ||
1547 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1548 | if (wiphy->bands[band]) | |
1549 | reg_process_ht_flags_band(wiphy, band); | |
1550 | } | |
1551 | ||
1552 | } | |
1553 | ||
7db90f4a LR |
1554 | void wiphy_update_regulatory(struct wiphy *wiphy, |
1555 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1556 | { |
1557 | enum ieee80211_band band; | |
d46e5b1d | 1558 | |
7db90f4a | 1559 | if (ignore_reg_update(wiphy, initiator)) |
e38f8a7a | 1560 | goto out; |
b2e1b302 | 1561 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1562 | if (wiphy->bands[band]) |
a92a3ce7 | 1563 | handle_band(wiphy, band); |
b2e1b302 | 1564 | } |
e38f8a7a LR |
1565 | out: |
1566 | reg_process_beacons(wiphy); | |
038659e7 | 1567 | reg_process_ht_flags(wiphy); |
560e28e1 | 1568 | if (wiphy->reg_notifier) |
716f9392 | 1569 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1570 | } |
1571 | ||
1fa25e41 LR |
1572 | static void handle_channel_custom(struct wiphy *wiphy, |
1573 | enum ieee80211_band band, | |
1574 | unsigned int chan_idx, | |
1575 | const struct ieee80211_regdomain *regd) | |
1576 | { | |
1577 | int r; | |
038659e7 LR |
1578 | u32 desired_bw_khz = MHZ_TO_KHZ(20); |
1579 | u32 bw_flags = 0; | |
1fa25e41 LR |
1580 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1581 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 1582 | const struct ieee80211_freq_range *freq_range = NULL; |
1fa25e41 LR |
1583 | struct ieee80211_supported_band *sband; |
1584 | struct ieee80211_channel *chan; | |
1585 | ||
abc7381b | 1586 | assert_reg_lock(); |
ac46d48e | 1587 | |
1fa25e41 LR |
1588 | sband = wiphy->bands[band]; |
1589 | BUG_ON(chan_idx >= sband->n_channels); | |
1590 | chan = &sband->channels[chan_idx]; | |
1591 | ||
038659e7 LR |
1592 | r = freq_reg_info_regd(wiphy, |
1593 | MHZ_TO_KHZ(chan->center_freq), | |
1594 | desired_bw_khz, | |
1595 | ®_rule, | |
1596 | regd); | |
1fa25e41 LR |
1597 | |
1598 | if (r) { | |
1599 | chan->flags = IEEE80211_CHAN_DISABLED; | |
1600 | return; | |
1601 | } | |
1602 | ||
1603 | power_rule = ®_rule->power_rule; | |
038659e7 LR |
1604 | freq_range = ®_rule->freq_range; |
1605 | ||
1606 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1607 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
1fa25e41 | 1608 | |
038659e7 | 1609 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; |
1fa25e41 | 1610 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); |
1fa25e41 LR |
1611 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
1612 | } | |
1613 | ||
1614 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1615 | const struct ieee80211_regdomain *regd) | |
1616 | { | |
1617 | unsigned int i; | |
1618 | struct ieee80211_supported_band *sband; | |
1619 | ||
1620 | BUG_ON(!wiphy->bands[band]); | |
1621 | sband = wiphy->bands[band]; | |
1622 | ||
1623 | for (i = 0; i < sband->n_channels; i++) | |
1624 | handle_channel_custom(wiphy, band, i, regd); | |
1625 | } | |
1626 | ||
1627 | /* Used by drivers prior to wiphy registration */ | |
1628 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1629 | const struct ieee80211_regdomain *regd) | |
1630 | { | |
1631 | enum ieee80211_band band; | |
bbcf3f02 | 1632 | unsigned int bands_set = 0; |
ac46d48e | 1633 | |
abc7381b | 1634 | mutex_lock(®_mutex); |
1fa25e41 | 1635 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
bbcf3f02 LR |
1636 | if (!wiphy->bands[band]) |
1637 | continue; | |
1638 | handle_band_custom(wiphy, band, regd); | |
1639 | bands_set++; | |
b2e1b302 | 1640 | } |
abc7381b | 1641 | mutex_unlock(®_mutex); |
bbcf3f02 LR |
1642 | |
1643 | /* | |
1644 | * no point in calling this if it won't have any effect | |
1645 | * on your device's supportd bands. | |
1646 | */ | |
1647 | WARN_ON(!bands_set); | |
b2e1b302 | 1648 | } |
1fa25e41 LR |
1649 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1650 | ||
fb1fc7ad LR |
1651 | /* |
1652 | * Return value which can be used by ignore_request() to indicate | |
1653 | * it has been determined we should intersect two regulatory domains | |
1654 | */ | |
9c96477d LR |
1655 | #define REG_INTERSECT 1 |
1656 | ||
84fa4f43 JB |
1657 | /* This has the logic which determines when a new request |
1658 | * should be ignored. */ | |
2f92cd2e LR |
1659 | static int ignore_request(struct wiphy *wiphy, |
1660 | struct regulatory_request *pending_request) | |
84fa4f43 | 1661 | { |
806a9e39 | 1662 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1663 | |
1664 | assert_cfg80211_lock(); | |
1665 | ||
84fa4f43 JB |
1666 | /* All initial requests are respected */ |
1667 | if (!last_request) | |
1668 | return 0; | |
1669 | ||
2f92cd2e | 1670 | switch (pending_request->initiator) { |
7db90f4a | 1671 | case NL80211_REGDOM_SET_BY_CORE: |
09d989d1 | 1672 | return 0; |
7db90f4a | 1673 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1674 | |
1675 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1676 | ||
2f92cd2e | 1677 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1678 | return -EINVAL; |
7db90f4a LR |
1679 | if (last_request->initiator == |
1680 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1681 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1682 | /* |
1683 | * Two cards with two APs claiming different | |
1fe90b03 | 1684 | * Country IE alpha2s. We could |
84fa4f43 JB |
1685 | * intersect them, but that seems unlikely |
1686 | * to be correct. Reject second one for now. | |
1687 | */ | |
2f92cd2e | 1688 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1689 | return -EOPNOTSUPP; |
1690 | return -EALREADY; | |
1691 | } | |
fb1fc7ad LR |
1692 | /* |
1693 | * Two consecutive Country IE hints on the same wiphy. | |
1694 | * This should be picked up early by the driver/stack | |
1695 | */ | |
2f92cd2e | 1696 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1697 | return 0; |
1698 | return -EALREADY; | |
1699 | } | |
3f2355cb | 1700 | return REG_INTERSECT; |
7db90f4a LR |
1701 | case NL80211_REGDOM_SET_BY_DRIVER: |
1702 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
2f92cd2e | 1703 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1704 | return 0; |
84fa4f43 | 1705 | return -EALREADY; |
e74b1e7f | 1706 | } |
fff32c04 LR |
1707 | |
1708 | /* | |
1709 | * This would happen if you unplug and plug your card | |
1710 | * back in or if you add a new device for which the previously | |
1711 | * loaded card also agrees on the regulatory domain. | |
1712 | */ | |
7db90f4a | 1713 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1714 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1715 | return -EALREADY; |
1716 | ||
3e0c3ff3 | 1717 | return REG_INTERSECT; |
7db90f4a LR |
1718 | case NL80211_REGDOM_SET_BY_USER: |
1719 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1720 | return REG_INTERSECT; |
fb1fc7ad LR |
1721 | /* |
1722 | * If the user knows better the user should set the regdom | |
1723 | * to their country before the IE is picked up | |
1724 | */ | |
7db90f4a | 1725 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1726 | last_request->intersect) |
1727 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1728 | /* |
1729 | * Process user requests only after previous user/driver/core | |
1730 | * requests have been processed | |
1731 | */ | |
7db90f4a LR |
1732 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1733 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1734 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
69b1572b | 1735 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1736 | return -EAGAIN; |
1737 | } | |
1738 | ||
baeb66fe | 1739 | if (!regdom_changes(pending_request->alpha2)) |
e74b1e7f LR |
1740 | return -EALREADY; |
1741 | ||
84fa4f43 JB |
1742 | return 0; |
1743 | } | |
1744 | ||
1745 | return -EINVAL; | |
1746 | } | |
1747 | ||
d1c96a9a LR |
1748 | /** |
1749 | * __regulatory_hint - hint to the wireless core a regulatory domain | |
1750 | * @wiphy: if the hint comes from country information from an AP, this | |
1751 | * is required to be set to the wiphy that received the information | |
28da32d7 | 1752 | * @pending_request: the regulatory request currently being processed |
d1c96a9a LR |
1753 | * |
1754 | * The Wireless subsystem can use this function to hint to the wireless core | |
28da32d7 | 1755 | * what it believes should be the current regulatory domain. |
d1c96a9a LR |
1756 | * |
1757 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1758 | * already been set or other standard error codes. | |
1759 | * | |
abc7381b | 1760 | * Caller must hold &cfg80211_mutex and ®_mutex |
d1c96a9a | 1761 | */ |
28da32d7 LR |
1762 | static int __regulatory_hint(struct wiphy *wiphy, |
1763 | struct regulatory_request *pending_request) | |
b2e1b302 | 1764 | { |
9c96477d | 1765 | bool intersect = false; |
b2e1b302 LR |
1766 | int r = 0; |
1767 | ||
761cf7ec LR |
1768 | assert_cfg80211_lock(); |
1769 | ||
2f92cd2e | 1770 | r = ignore_request(wiphy, pending_request); |
9c96477d | 1771 | |
3e0c3ff3 | 1772 | if (r == REG_INTERSECT) { |
7db90f4a LR |
1773 | if (pending_request->initiator == |
1774 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1775 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1776 | if (r) { |
1777 | kfree(pending_request); | |
3e0c3ff3 | 1778 | return r; |
d951c1dd | 1779 | } |
3e0c3ff3 | 1780 | } |
9c96477d | 1781 | intersect = true; |
3e0c3ff3 | 1782 | } else if (r) { |
fb1fc7ad LR |
1783 | /* |
1784 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1785 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1786 | * wiphy |
1787 | */ | |
28da32d7 | 1788 | if (r == -EALREADY && |
7db90f4a LR |
1789 | pending_request->initiator == |
1790 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1791 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1792 | if (r) { |
1793 | kfree(pending_request); | |
3e0c3ff3 | 1794 | return r; |
d951c1dd | 1795 | } |
3e0c3ff3 LR |
1796 | r = -EALREADY; |
1797 | goto new_request; | |
1798 | } | |
d951c1dd | 1799 | kfree(pending_request); |
b2e1b302 | 1800 | return r; |
3e0c3ff3 | 1801 | } |
b2e1b302 | 1802 | |
3e0c3ff3 | 1803 | new_request: |
d951c1dd | 1804 | kfree(last_request); |
5203cdb6 | 1805 | |
d951c1dd LR |
1806 | last_request = pending_request; |
1807 | last_request->intersect = intersect; | |
5203cdb6 | 1808 | |
d951c1dd | 1809 | pending_request = NULL; |
3e0c3ff3 | 1810 | |
09d989d1 LR |
1811 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) { |
1812 | user_alpha2[0] = last_request->alpha2[0]; | |
1813 | user_alpha2[1] = last_request->alpha2[1]; | |
1814 | } | |
1815 | ||
3e0c3ff3 | 1816 | /* When r == REG_INTERSECT we do need to call CRDA */ |
73d54c9e LR |
1817 | if (r < 0) { |
1818 | /* | |
1819 | * Since CRDA will not be called in this case as we already | |
1820 | * have applied the requested regulatory domain before we just | |
1821 | * inform userspace we have processed the request | |
1822 | */ | |
1823 | if (r == -EALREADY) | |
1824 | nl80211_send_reg_change_event(last_request); | |
3e0c3ff3 | 1825 | return r; |
73d54c9e | 1826 | } |
3e0c3ff3 | 1827 | |
d951c1dd | 1828 | return call_crda(last_request->alpha2); |
b2e1b302 LR |
1829 | } |
1830 | ||
30a548c7 | 1831 | /* This processes *all* regulatory hints */ |
d951c1dd | 1832 | static void reg_process_hint(struct regulatory_request *reg_request) |
fe33eb39 LR |
1833 | { |
1834 | int r = 0; | |
1835 | struct wiphy *wiphy = NULL; | |
1836 | ||
1837 | BUG_ON(!reg_request->alpha2); | |
1838 | ||
1839 | mutex_lock(&cfg80211_mutex); | |
abc7381b | 1840 | mutex_lock(®_mutex); |
fe33eb39 LR |
1841 | |
1842 | if (wiphy_idx_valid(reg_request->wiphy_idx)) | |
1843 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1844 | ||
7db90f4a | 1845 | if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
fe33eb39 | 1846 | !wiphy) { |
d951c1dd | 1847 | kfree(reg_request); |
fe33eb39 LR |
1848 | goto out; |
1849 | } | |
1850 | ||
28da32d7 | 1851 | r = __regulatory_hint(wiphy, reg_request); |
fe33eb39 | 1852 | /* This is required so that the orig_* parameters are saved */ |
5be83de5 JB |
1853 | if (r == -EALREADY && wiphy && |
1854 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) | |
fe33eb39 LR |
1855 | wiphy_update_regulatory(wiphy, reg_request->initiator); |
1856 | out: | |
abc7381b | 1857 | mutex_unlock(®_mutex); |
fe33eb39 | 1858 | mutex_unlock(&cfg80211_mutex); |
fe33eb39 LR |
1859 | } |
1860 | ||
7db90f4a | 1861 | /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */ |
fe33eb39 LR |
1862 | static void reg_process_pending_hints(void) |
1863 | { | |
1864 | struct regulatory_request *reg_request; | |
fe33eb39 LR |
1865 | |
1866 | spin_lock(®_requests_lock); | |
1867 | while (!list_empty(®_requests_list)) { | |
1868 | reg_request = list_first_entry(®_requests_list, | |
1869 | struct regulatory_request, | |
1870 | list); | |
1871 | list_del_init(®_request->list); | |
fe33eb39 | 1872 | |
d951c1dd LR |
1873 | spin_unlock(®_requests_lock); |
1874 | reg_process_hint(reg_request); | |
fe33eb39 LR |
1875 | spin_lock(®_requests_lock); |
1876 | } | |
1877 | spin_unlock(®_requests_lock); | |
1878 | } | |
1879 | ||
e38f8a7a LR |
1880 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1881 | static void reg_process_pending_beacon_hints(void) | |
1882 | { | |
79c97e97 | 1883 | struct cfg80211_registered_device *rdev; |
e38f8a7a LR |
1884 | struct reg_beacon *pending_beacon, *tmp; |
1885 | ||
abc7381b LR |
1886 | /* |
1887 | * No need to hold the reg_mutex here as we just touch wiphys | |
1888 | * and do not read or access regulatory variables. | |
1889 | */ | |
e38f8a7a LR |
1890 | mutex_lock(&cfg80211_mutex); |
1891 | ||
1892 | /* This goes through the _pending_ beacon list */ | |
1893 | spin_lock_bh(®_pending_beacons_lock); | |
1894 | ||
1895 | if (list_empty(®_pending_beacons)) { | |
1896 | spin_unlock_bh(®_pending_beacons_lock); | |
1897 | goto out; | |
1898 | } | |
1899 | ||
1900 | list_for_each_entry_safe(pending_beacon, tmp, | |
1901 | ®_pending_beacons, list) { | |
1902 | ||
1903 | list_del_init(&pending_beacon->list); | |
1904 | ||
1905 | /* Applies the beacon hint to current wiphys */ | |
79c97e97 JB |
1906 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1907 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); | |
e38f8a7a LR |
1908 | |
1909 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
1910 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
1911 | } | |
1912 | ||
1913 | spin_unlock_bh(®_pending_beacons_lock); | |
1914 | out: | |
1915 | mutex_unlock(&cfg80211_mutex); | |
1916 | } | |
1917 | ||
fe33eb39 LR |
1918 | static void reg_todo(struct work_struct *work) |
1919 | { | |
1920 | reg_process_pending_hints(); | |
e38f8a7a | 1921 | reg_process_pending_beacon_hints(); |
fe33eb39 LR |
1922 | } |
1923 | ||
1924 | static DECLARE_WORK(reg_work, reg_todo); | |
1925 | ||
1926 | static void queue_regulatory_request(struct regulatory_request *request) | |
1927 | { | |
1928 | spin_lock(®_requests_lock); | |
1929 | list_add_tail(&request->list, ®_requests_list); | |
1930 | spin_unlock(®_requests_lock); | |
1931 | ||
1932 | schedule_work(®_work); | |
1933 | } | |
1934 | ||
09d989d1 LR |
1935 | /* |
1936 | * Core regulatory hint -- happens during cfg80211_init() | |
1937 | * and when we restore regulatory settings. | |
1938 | */ | |
ba25c141 LR |
1939 | static int regulatory_hint_core(const char *alpha2) |
1940 | { | |
1941 | struct regulatory_request *request; | |
1942 | ||
09d989d1 LR |
1943 | kfree(last_request); |
1944 | last_request = NULL; | |
ba25c141 LR |
1945 | |
1946 | request = kzalloc(sizeof(struct regulatory_request), | |
1947 | GFP_KERNEL); | |
1948 | if (!request) | |
1949 | return -ENOMEM; | |
1950 | ||
1951 | request->alpha2[0] = alpha2[0]; | |
1952 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1953 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
ba25c141 | 1954 | |
5078b2e3 LR |
1955 | /* |
1956 | * This ensures last_request is populated once modules | |
1957 | * come swinging in and calling regulatory hints and | |
1958 | * wiphy_apply_custom_regulatory(). | |
1959 | */ | |
a2bff269 | 1960 | reg_process_hint(request); |
5078b2e3 | 1961 | |
fe33eb39 | 1962 | return 0; |
ba25c141 LR |
1963 | } |
1964 | ||
fe33eb39 LR |
1965 | /* User hints */ |
1966 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1967 | { |
fe33eb39 LR |
1968 | struct regulatory_request *request; |
1969 | ||
be3d4810 | 1970 | BUG_ON(!alpha2); |
b2e1b302 | 1971 | |
fe33eb39 LR |
1972 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1973 | if (!request) | |
1974 | return -ENOMEM; | |
1975 | ||
1976 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1977 | request->alpha2[0] = alpha2[0]; | |
1978 | request->alpha2[1] = alpha2[1]; | |
e12822e1 | 1979 | request->initiator = NL80211_REGDOM_SET_BY_USER; |
fe33eb39 LR |
1980 | |
1981 | queue_regulatory_request(request); | |
1982 | ||
1983 | return 0; | |
1984 | } | |
1985 | ||
1986 | /* Driver hints */ | |
1987 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1988 | { | |
1989 | struct regulatory_request *request; | |
1990 | ||
1991 | BUG_ON(!alpha2); | |
1992 | BUG_ON(!wiphy); | |
1993 | ||
1994 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1995 | if (!request) | |
1996 | return -ENOMEM; | |
1997 | ||
1998 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1999 | ||
2000 | /* Must have registered wiphy first */ | |
2001 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
2002 | ||
2003 | request->alpha2[0] = alpha2[0]; | |
2004 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 2005 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
fe33eb39 LR |
2006 | |
2007 | queue_regulatory_request(request); | |
2008 | ||
2009 | return 0; | |
b2e1b302 LR |
2010 | } |
2011 | EXPORT_SYMBOL(regulatory_hint); | |
2012 | ||
abc7381b | 2013 | /* Caller must hold reg_mutex */ |
3f2355cb LR |
2014 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, |
2015 | u32 country_ie_checksum) | |
2016 | { | |
806a9e39 LR |
2017 | struct wiphy *request_wiphy; |
2018 | ||
abc7381b | 2019 | assert_reg_lock(); |
761cf7ec | 2020 | |
cc0b6fe8 LR |
2021 | if (unlikely(last_request->initiator != |
2022 | NL80211_REGDOM_SET_BY_COUNTRY_IE)) | |
2023 | return false; | |
2024 | ||
806a9e39 LR |
2025 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
2026 | ||
2027 | if (!request_wiphy) | |
3f2355cb | 2028 | return false; |
806a9e39 LR |
2029 | |
2030 | if (likely(request_wiphy != wiphy)) | |
3f2355cb | 2031 | return !country_ie_integrity_changes(country_ie_checksum); |
fb1fc7ad LR |
2032 | /* |
2033 | * We should not have let these through at this point, they | |
3f2355cb | 2034 | * should have been picked up earlier by the first alpha2 check |
fb1fc7ad LR |
2035 | * on the device |
2036 | */ | |
3f2355cb LR |
2037 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) |
2038 | return true; | |
2039 | return false; | |
2040 | } | |
2041 | ||
4b44c8bc LR |
2042 | /* |
2043 | * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and | |
2044 | * therefore cannot iterate over the rdev list here. | |
2045 | */ | |
3f2355cb | 2046 | void regulatory_hint_11d(struct wiphy *wiphy, |
84920e3e LR |
2047 | enum ieee80211_band band, |
2048 | u8 *country_ie, | |
2049 | u8 country_ie_len) | |
3f2355cb LR |
2050 | { |
2051 | struct ieee80211_regdomain *rd = NULL; | |
2052 | char alpha2[2]; | |
2053 | u32 checksum = 0; | |
2054 | enum environment_cap env = ENVIRON_ANY; | |
fe33eb39 | 2055 | struct regulatory_request *request; |
3f2355cb | 2056 | |
abc7381b | 2057 | mutex_lock(®_mutex); |
3f2355cb | 2058 | |
9828b017 LR |
2059 | if (unlikely(!last_request)) |
2060 | goto out; | |
d335fe63 | 2061 | |
3f2355cb LR |
2062 | /* IE len must be evenly divisible by 2 */ |
2063 | if (country_ie_len & 0x01) | |
2064 | goto out; | |
2065 | ||
2066 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
2067 | goto out; | |
2068 | ||
fb1fc7ad LR |
2069 | /* |
2070 | * Pending country IE processing, this can happen after we | |
3f2355cb | 2071 | * call CRDA and wait for a response if a beacon was received before |
fb1fc7ad LR |
2072 | * we were able to process the last regulatory_hint_11d() call |
2073 | */ | |
3f2355cb LR |
2074 | if (country_ie_regdomain) |
2075 | goto out; | |
2076 | ||
2077 | alpha2[0] = country_ie[0]; | |
2078 | alpha2[1] = country_ie[1]; | |
2079 | ||
2080 | if (country_ie[2] == 'I') | |
2081 | env = ENVIRON_INDOOR; | |
2082 | else if (country_ie[2] == 'O') | |
2083 | env = ENVIRON_OUTDOOR; | |
2084 | ||
fb1fc7ad | 2085 | /* |
8b19e6ca | 2086 | * We will run this only upon a successful connection on cfg80211. |
4b44c8bc LR |
2087 | * We leave conflict resolution to the workqueue, where can hold |
2088 | * cfg80211_mutex. | |
fb1fc7ad | 2089 | */ |
cc0b6fe8 LR |
2090 | if (likely(last_request->initiator == |
2091 | NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
4b44c8bc LR |
2092 | wiphy_idx_valid(last_request->wiphy_idx))) |
2093 | goto out; | |
3f2355cb | 2094 | |
84920e3e | 2095 | rd = country_ie_2_rd(band, country_ie, country_ie_len, &checksum); |
b74d12e1 LR |
2096 | if (!rd) { |
2097 | REG_DBG_PRINT("cfg80211: Ignoring bogus country IE\n"); | |
3f2355cb | 2098 | goto out; |
b74d12e1 | 2099 | } |
3f2355cb | 2100 | |
915278e0 LR |
2101 | /* |
2102 | * This will not happen right now but we leave it here for the | |
3f2355cb LR |
2103 | * the future when we want to add suspend/resume support and having |
2104 | * the user move to another country after doing so, or having the user | |
915278e0 LR |
2105 | * move to another AP. Right now we just trust the first AP. |
2106 | * | |
2107 | * If we hit this before we add this support we want to be informed of | |
2108 | * it as it would indicate a mistake in the current design | |
2109 | */ | |
2110 | if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum))) | |
0441d6ff | 2111 | goto free_rd_out; |
3f2355cb | 2112 | |
fe33eb39 LR |
2113 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
2114 | if (!request) | |
2115 | goto free_rd_out; | |
2116 | ||
fb1fc7ad LR |
2117 | /* |
2118 | * We keep this around for when CRDA comes back with a response so | |
2119 | * we can intersect with that | |
2120 | */ | |
3f2355cb LR |
2121 | country_ie_regdomain = rd; |
2122 | ||
fe33eb39 LR |
2123 | request->wiphy_idx = get_wiphy_idx(wiphy); |
2124 | request->alpha2[0] = rd->alpha2[0]; | |
2125 | request->alpha2[1] = rd->alpha2[1]; | |
7db90f4a | 2126 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
fe33eb39 LR |
2127 | request->country_ie_checksum = checksum; |
2128 | request->country_ie_env = env; | |
2129 | ||
abc7381b | 2130 | mutex_unlock(®_mutex); |
3f2355cb | 2131 | |
fe33eb39 LR |
2132 | queue_regulatory_request(request); |
2133 | ||
2134 | return; | |
0441d6ff LR |
2135 | |
2136 | free_rd_out: | |
2137 | kfree(rd); | |
3f2355cb | 2138 | out: |
abc7381b | 2139 | mutex_unlock(®_mutex); |
3f2355cb | 2140 | } |
b2e1b302 | 2141 | |
09d989d1 LR |
2142 | static void restore_alpha2(char *alpha2, bool reset_user) |
2143 | { | |
2144 | /* indicates there is no alpha2 to consider for restoration */ | |
2145 | alpha2[0] = '9'; | |
2146 | alpha2[1] = '7'; | |
2147 | ||
2148 | /* The user setting has precedence over the module parameter */ | |
2149 | if (is_user_regdom_saved()) { | |
2150 | /* Unless we're asked to ignore it and reset it */ | |
2151 | if (reset_user) { | |
2152 | REG_DBG_PRINT("cfg80211: Restoring regulatory settings " | |
2153 | "including user preference\n"); | |
2154 | user_alpha2[0] = '9'; | |
2155 | user_alpha2[1] = '7'; | |
2156 | ||
2157 | /* | |
2158 | * If we're ignoring user settings, we still need to | |
2159 | * check the module parameter to ensure we put things | |
2160 | * back as they were for a full restore. | |
2161 | */ | |
2162 | if (!is_world_regdom(ieee80211_regdom)) { | |
2163 | REG_DBG_PRINT("cfg80211: Keeping preference on " | |
2164 | "module parameter ieee80211_regdom: %c%c\n", | |
2165 | ieee80211_regdom[0], | |
2166 | ieee80211_regdom[1]); | |
2167 | alpha2[0] = ieee80211_regdom[0]; | |
2168 | alpha2[1] = ieee80211_regdom[1]; | |
2169 | } | |
2170 | } else { | |
2171 | REG_DBG_PRINT("cfg80211: Restoring regulatory settings " | |
2172 | "while preserving user preference for: %c%c\n", | |
2173 | user_alpha2[0], | |
2174 | user_alpha2[1]); | |
2175 | alpha2[0] = user_alpha2[0]; | |
2176 | alpha2[1] = user_alpha2[1]; | |
2177 | } | |
2178 | } else if (!is_world_regdom(ieee80211_regdom)) { | |
2179 | REG_DBG_PRINT("cfg80211: Keeping preference on " | |
2180 | "module parameter ieee80211_regdom: %c%c\n", | |
2181 | ieee80211_regdom[0], | |
2182 | ieee80211_regdom[1]); | |
2183 | alpha2[0] = ieee80211_regdom[0]; | |
2184 | alpha2[1] = ieee80211_regdom[1]; | |
2185 | } else | |
2186 | REG_DBG_PRINT("cfg80211: Restoring regulatory settings\n"); | |
2187 | } | |
2188 | ||
2189 | /* | |
2190 | * Restoring regulatory settings involves ingoring any | |
2191 | * possibly stale country IE information and user regulatory | |
2192 | * settings if so desired, this includes any beacon hints | |
2193 | * learned as we could have traveled outside to another country | |
2194 | * after disconnection. To restore regulatory settings we do | |
2195 | * exactly what we did at bootup: | |
2196 | * | |
2197 | * - send a core regulatory hint | |
2198 | * - send a user regulatory hint if applicable | |
2199 | * | |
2200 | * Device drivers that send a regulatory hint for a specific country | |
2201 | * keep their own regulatory domain on wiphy->regd so that does does | |
2202 | * not need to be remembered. | |
2203 | */ | |
2204 | static void restore_regulatory_settings(bool reset_user) | |
2205 | { | |
2206 | char alpha2[2]; | |
2207 | struct reg_beacon *reg_beacon, *btmp; | |
2208 | ||
2209 | mutex_lock(&cfg80211_mutex); | |
2210 | mutex_lock(®_mutex); | |
2211 | ||
2212 | reset_regdomains(); | |
2213 | restore_alpha2(alpha2, reset_user); | |
2214 | ||
2215 | /* Clear beacon hints */ | |
2216 | spin_lock_bh(®_pending_beacons_lock); | |
2217 | if (!list_empty(®_pending_beacons)) { | |
2218 | list_for_each_entry_safe(reg_beacon, btmp, | |
2219 | ®_pending_beacons, list) { | |
2220 | list_del(®_beacon->list); | |
2221 | kfree(reg_beacon); | |
2222 | } | |
2223 | } | |
2224 | spin_unlock_bh(®_pending_beacons_lock); | |
2225 | ||
2226 | if (!list_empty(®_beacon_list)) { | |
2227 | list_for_each_entry_safe(reg_beacon, btmp, | |
2228 | ®_beacon_list, list) { | |
2229 | list_del(®_beacon->list); | |
2230 | kfree(reg_beacon); | |
2231 | } | |
2232 | } | |
2233 | ||
2234 | /* First restore to the basic regulatory settings */ | |
2235 | cfg80211_regdomain = cfg80211_world_regdom; | |
2236 | ||
2237 | mutex_unlock(®_mutex); | |
2238 | mutex_unlock(&cfg80211_mutex); | |
2239 | ||
2240 | regulatory_hint_core(cfg80211_regdomain->alpha2); | |
2241 | ||
2242 | /* | |
2243 | * This restores the ieee80211_regdom module parameter | |
2244 | * preference or the last user requested regulatory | |
2245 | * settings, user regulatory settings takes precedence. | |
2246 | */ | |
2247 | if (is_an_alpha2(alpha2)) | |
2248 | regulatory_hint_user(user_alpha2); | |
2249 | } | |
2250 | ||
2251 | ||
2252 | void regulatory_hint_disconnect(void) | |
2253 | { | |
2254 | REG_DBG_PRINT("cfg80211: All devices are disconnected, going to " | |
2255 | "restore regulatory settings\n"); | |
2256 | restore_regulatory_settings(false); | |
2257 | } | |
2258 | ||
e38f8a7a LR |
2259 | static bool freq_is_chan_12_13_14(u16 freq) |
2260 | { | |
2261 | if (freq == ieee80211_channel_to_frequency(12) || | |
2262 | freq == ieee80211_channel_to_frequency(13) || | |
2263 | freq == ieee80211_channel_to_frequency(14)) | |
2264 | return true; | |
2265 | return false; | |
2266 | } | |
2267 | ||
2268 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
2269 | struct ieee80211_channel *beacon_chan, | |
2270 | gfp_t gfp) | |
2271 | { | |
2272 | struct reg_beacon *reg_beacon; | |
2273 | ||
2274 | if (likely((beacon_chan->beacon_found || | |
2275 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || | |
2276 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
2277 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) | |
2278 | return 0; | |
2279 | ||
2280 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
2281 | if (!reg_beacon) | |
2282 | return -ENOMEM; | |
2283 | ||
4113f751 LR |
2284 | REG_DBG_PRINT("cfg80211: Found new beacon on " |
2285 | "frequency: %d MHz (Ch %d) on %s\n", | |
2286 | beacon_chan->center_freq, | |
2287 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
2288 | wiphy_name(wiphy)); | |
2289 | ||
e38f8a7a LR |
2290 | memcpy(®_beacon->chan, beacon_chan, |
2291 | sizeof(struct ieee80211_channel)); | |
2292 | ||
2293 | ||
2294 | /* | |
2295 | * Since we can be called from BH or and non-BH context | |
2296 | * we must use spin_lock_bh() | |
2297 | */ | |
2298 | spin_lock_bh(®_pending_beacons_lock); | |
2299 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
2300 | spin_unlock_bh(®_pending_beacons_lock); | |
2301 | ||
2302 | schedule_work(®_work); | |
2303 | ||
2304 | return 0; | |
2305 | } | |
2306 | ||
a3d2eaf0 | 2307 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
2308 | { |
2309 | unsigned int i; | |
a3d2eaf0 JB |
2310 | const struct ieee80211_reg_rule *reg_rule = NULL; |
2311 | const struct ieee80211_freq_range *freq_range = NULL; | |
2312 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 | 2313 | |
269ac5fd | 2314 | printk(KERN_INFO " (start_freq - end_freq @ bandwidth), " |
b2e1b302 LR |
2315 | "(max_antenna_gain, max_eirp)\n"); |
2316 | ||
2317 | for (i = 0; i < rd->n_reg_rules; i++) { | |
2318 | reg_rule = &rd->reg_rules[i]; | |
2319 | freq_range = ®_rule->freq_range; | |
2320 | power_rule = ®_rule->power_rule; | |
2321 | ||
fb1fc7ad LR |
2322 | /* |
2323 | * There may not be documentation for max antenna gain | |
2324 | * in certain regions | |
2325 | */ | |
b2e1b302 | 2326 | if (power_rule->max_antenna_gain) |
269ac5fd | 2327 | printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), " |
b2e1b302 LR |
2328 | "(%d mBi, %d mBm)\n", |
2329 | freq_range->start_freq_khz, | |
2330 | freq_range->end_freq_khz, | |
2331 | freq_range->max_bandwidth_khz, | |
2332 | power_rule->max_antenna_gain, | |
2333 | power_rule->max_eirp); | |
2334 | else | |
269ac5fd | 2335 | printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), " |
b2e1b302 LR |
2336 | "(N/A, %d mBm)\n", |
2337 | freq_range->start_freq_khz, | |
2338 | freq_range->end_freq_khz, | |
2339 | freq_range->max_bandwidth_khz, | |
2340 | power_rule->max_eirp); | |
2341 | } | |
2342 | } | |
2343 | ||
a3d2eaf0 | 2344 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
2345 | { |
2346 | ||
3f2355cb | 2347 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 2348 | |
7db90f4a LR |
2349 | if (last_request->initiator == |
2350 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
79c97e97 JB |
2351 | struct cfg80211_registered_device *rdev; |
2352 | rdev = cfg80211_rdev_by_wiphy_idx( | |
806a9e39 | 2353 | last_request->wiphy_idx); |
79c97e97 | 2354 | if (rdev) { |
3f2355cb LR |
2355 | printk(KERN_INFO "cfg80211: Current regulatory " |
2356 | "domain updated by AP to: %c%c\n", | |
79c97e97 JB |
2357 | rdev->country_ie_alpha2[0], |
2358 | rdev->country_ie_alpha2[1]); | |
3f2355cb LR |
2359 | } else |
2360 | printk(KERN_INFO "cfg80211: Current regulatory " | |
2361 | "domain intersected: \n"); | |
2362 | } else | |
2363 | printk(KERN_INFO "cfg80211: Current regulatory " | |
039498c6 | 2364 | "domain intersected: \n"); |
3f2355cb | 2365 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
2366 | printk(KERN_INFO "cfg80211: World regulatory " |
2367 | "domain updated:\n"); | |
2368 | else { | |
2369 | if (is_unknown_alpha2(rd->alpha2)) | |
2370 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
2371 | "changed to driver built-in settings " | |
2372 | "(unknown country)\n"); | |
2373 | else | |
2374 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
2375 | "changed to country: %c%c\n", | |
2376 | rd->alpha2[0], rd->alpha2[1]); | |
2377 | } | |
2378 | print_rd_rules(rd); | |
2379 | } | |
2380 | ||
2df78167 | 2381 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
2382 | { |
2383 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
2384 | rd->alpha2[0], rd->alpha2[1]); | |
2385 | print_rd_rules(rd); | |
2386 | } | |
2387 | ||
3f2355cb LR |
2388 | #ifdef CONFIG_CFG80211_REG_DEBUG |
2389 | static void reg_country_ie_process_debug( | |
2390 | const struct ieee80211_regdomain *rd, | |
2391 | const struct ieee80211_regdomain *country_ie_regdomain, | |
2392 | const struct ieee80211_regdomain *intersected_rd) | |
2393 | { | |
2394 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
2395 | print_regdomain_info(country_ie_regdomain); | |
2396 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
2397 | print_regdomain_info(rd); | |
2398 | if (intersected_rd) { | |
2399 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
2400 | "and get:\n"); | |
667ecd01 | 2401 | print_regdomain_info(intersected_rd); |
3f2355cb LR |
2402 | return; |
2403 | } | |
2404 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
2405 | } | |
2406 | #else | |
2407 | static inline void reg_country_ie_process_debug( | |
2408 | const struct ieee80211_regdomain *rd, | |
2409 | const struct ieee80211_regdomain *country_ie_regdomain, | |
2410 | const struct ieee80211_regdomain *intersected_rd) | |
2411 | { | |
2412 | } | |
2413 | #endif | |
2414 | ||
d2372b31 | 2415 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 2416 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2417 | { |
9c96477d | 2418 | const struct ieee80211_regdomain *intersected_rd = NULL; |
79c97e97 | 2419 | struct cfg80211_registered_device *rdev = NULL; |
806a9e39 | 2420 | struct wiphy *request_wiphy; |
b2e1b302 LR |
2421 | /* Some basic sanity checks first */ |
2422 | ||
b2e1b302 | 2423 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 2424 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2425 | return -EINVAL; |
2426 | update_world_regdomain(rd); | |
2427 | return 0; | |
2428 | } | |
b2e1b302 LR |
2429 | |
2430 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
2431 | !is_unknown_alpha2(rd->alpha2)) | |
2432 | return -EINVAL; | |
2433 | ||
f6037d09 | 2434 | if (!last_request) |
b2e1b302 LR |
2435 | return -EINVAL; |
2436 | ||
fb1fc7ad LR |
2437 | /* |
2438 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 2439 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
2440 | * and the pending request came in from a country IE |
2441 | */ | |
7db90f4a | 2442 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
2443 | /* |
2444 | * If someone else asked us to change the rd lets only bother | |
2445 | * checking if the alpha2 changes if CRDA was already called | |
2446 | */ | |
baeb66fe | 2447 | if (!regdom_changes(rd->alpha2)) |
3f2355cb LR |
2448 | return -EINVAL; |
2449 | } | |
2450 | ||
fb1fc7ad LR |
2451 | /* |
2452 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
2453 | * and finally inform them of what we have done, in case they want |
2454 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
2455 | * internal EEPROM data |
2456 | */ | |
b2e1b302 | 2457 | |
f6037d09 | 2458 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2459 | return -EINVAL; |
2460 | ||
8375af3b LR |
2461 | if (!is_valid_rd(rd)) { |
2462 | printk(KERN_ERR "cfg80211: Invalid " | |
2463 | "regulatory domain detected:\n"); | |
2464 | print_regdomain_info(rd); | |
2465 | return -EINVAL; | |
b2e1b302 LR |
2466 | } |
2467 | ||
806a9e39 LR |
2468 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
2469 | ||
b8295acd | 2470 | if (!last_request->intersect) { |
3e0c3ff3 LR |
2471 | int r; |
2472 | ||
7db90f4a | 2473 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
3e0c3ff3 LR |
2474 | reset_regdomains(); |
2475 | cfg80211_regdomain = rd; | |
2476 | return 0; | |
2477 | } | |
2478 | ||
fb1fc7ad LR |
2479 | /* |
2480 | * For a driver hint, lets copy the regulatory domain the | |
2481 | * driver wanted to the wiphy to deal with conflicts | |
2482 | */ | |
3e0c3ff3 | 2483 | |
558f6d32 LR |
2484 | /* |
2485 | * Userspace could have sent two replies with only | |
2486 | * one kernel request. | |
2487 | */ | |
2488 | if (request_wiphy->regd) | |
2489 | return -EALREADY; | |
3e0c3ff3 | 2490 | |
806a9e39 | 2491 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
2492 | if (r) |
2493 | return r; | |
2494 | ||
b8295acd LR |
2495 | reset_regdomains(); |
2496 | cfg80211_regdomain = rd; | |
2497 | return 0; | |
2498 | } | |
2499 | ||
2500 | /* Intersection requires a bit more work */ | |
2501 | ||
7db90f4a | 2502 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 2503 | |
9c96477d LR |
2504 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
2505 | if (!intersected_rd) | |
2506 | return -EINVAL; | |
b8295acd | 2507 | |
fb1fc7ad LR |
2508 | /* |
2509 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 2510 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
2511 | * domain we keep it for its private use |
2512 | */ | |
7db90f4a | 2513 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 2514 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
2515 | else |
2516 | kfree(rd); | |
2517 | ||
b8295acd LR |
2518 | rd = NULL; |
2519 | ||
2520 | reset_regdomains(); | |
2521 | cfg80211_regdomain = intersected_rd; | |
2522 | ||
2523 | return 0; | |
9c96477d LR |
2524 | } |
2525 | ||
3f2355cb LR |
2526 | /* |
2527 | * Country IE requests are handled a bit differently, we intersect | |
2528 | * the country IE rd with what CRDA believes that country should have | |
2529 | */ | |
2530 | ||
729e9c76 LR |
2531 | /* |
2532 | * Userspace could have sent two replies with only | |
2533 | * one kernel request. By the second reply we would have | |
2534 | * already processed and consumed the country_ie_regdomain. | |
2535 | */ | |
2536 | if (!country_ie_regdomain) | |
2537 | return -EALREADY; | |
86f04680 | 2538 | BUG_ON(rd == country_ie_regdomain); |
3f2355cb | 2539 | |
86f04680 LR |
2540 | /* |
2541 | * Intersect what CRDA returned and our what we | |
2542 | * had built from the Country IE received | |
2543 | */ | |
3f2355cb | 2544 | |
86f04680 | 2545 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); |
3f2355cb | 2546 | |
86f04680 LR |
2547 | reg_country_ie_process_debug(rd, |
2548 | country_ie_regdomain, | |
2549 | intersected_rd); | |
3f2355cb | 2550 | |
86f04680 LR |
2551 | kfree(country_ie_regdomain); |
2552 | country_ie_regdomain = NULL; | |
3f2355cb LR |
2553 | |
2554 | if (!intersected_rd) | |
2555 | return -EINVAL; | |
2556 | ||
79c97e97 | 2557 | rdev = wiphy_to_dev(request_wiphy); |
3f2355cb | 2558 | |
79c97e97 JB |
2559 | rdev->country_ie_alpha2[0] = rd->alpha2[0]; |
2560 | rdev->country_ie_alpha2[1] = rd->alpha2[1]; | |
2561 | rdev->env = last_request->country_ie_env; | |
3f2355cb LR |
2562 | |
2563 | BUG_ON(intersected_rd == rd); | |
2564 | ||
2565 | kfree(rd); | |
2566 | rd = NULL; | |
2567 | ||
b8295acd | 2568 | reset_regdomains(); |
3f2355cb | 2569 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2570 | |
2571 | return 0; | |
2572 | } | |
2573 | ||
2574 | ||
fb1fc7ad LR |
2575 | /* |
2576 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2577 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2578 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2579 | */ | |
a3d2eaf0 | 2580 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2581 | { |
b2e1b302 LR |
2582 | int r; |
2583 | ||
761cf7ec LR |
2584 | assert_cfg80211_lock(); |
2585 | ||
abc7381b LR |
2586 | mutex_lock(®_mutex); |
2587 | ||
b2e1b302 LR |
2588 | /* Note that this doesn't update the wiphys, this is done below */ |
2589 | r = __set_regdom(rd); | |
d2372b31 JB |
2590 | if (r) { |
2591 | kfree(rd); | |
abc7381b | 2592 | mutex_unlock(®_mutex); |
b2e1b302 | 2593 | return r; |
d2372b31 | 2594 | } |
b2e1b302 | 2595 | |
b2e1b302 | 2596 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2597 | if (!last_request->intersect) |
2598 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2599 | |
2600 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2601 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2602 | |
a01ddafd | 2603 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2604 | |
73d54c9e LR |
2605 | nl80211_send_reg_change_event(last_request); |
2606 | ||
abc7381b LR |
2607 | mutex_unlock(®_mutex); |
2608 | ||
b2e1b302 LR |
2609 | return r; |
2610 | } | |
2611 | ||
a1794390 | 2612 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2613 | void reg_device_remove(struct wiphy *wiphy) |
2614 | { | |
0ad8acaf | 2615 | struct wiphy *request_wiphy = NULL; |
806a9e39 | 2616 | |
761cf7ec LR |
2617 | assert_cfg80211_lock(); |
2618 | ||
abc7381b LR |
2619 | mutex_lock(®_mutex); |
2620 | ||
0ef9ccdd CW |
2621 | kfree(wiphy->regd); |
2622 | ||
0ad8acaf LR |
2623 | if (last_request) |
2624 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
806a9e39 | 2625 | |
0ef9ccdd | 2626 | if (!request_wiphy || request_wiphy != wiphy) |
abc7381b | 2627 | goto out; |
0ef9ccdd | 2628 | |
806a9e39 | 2629 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb | 2630 | last_request->country_ie_env = ENVIRON_ANY; |
abc7381b LR |
2631 | out: |
2632 | mutex_unlock(®_mutex); | |
3f2355cb LR |
2633 | } |
2634 | ||
b2e1b302 LR |
2635 | int regulatory_init(void) |
2636 | { | |
bcf4f99b | 2637 | int err = 0; |
734366de | 2638 | |
b2e1b302 LR |
2639 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2640 | if (IS_ERR(reg_pdev)) | |
2641 | return PTR_ERR(reg_pdev); | |
734366de | 2642 | |
fe33eb39 | 2643 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2644 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2645 | |
a3d2eaf0 | 2646 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2647 | |
09d989d1 LR |
2648 | user_alpha2[0] = '9'; |
2649 | user_alpha2[1] = '7'; | |
2650 | ||
ae9e4b0d LR |
2651 | /* We always try to get an update for the static regdomain */ |
2652 | err = regulatory_hint_core(cfg80211_regdomain->alpha2); | |
ba25c141 | 2653 | if (err) { |
bcf4f99b LR |
2654 | if (err == -ENOMEM) |
2655 | return err; | |
2656 | /* | |
2657 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2658 | * memory which is handled and propagated appropriately above | |
2659 | * but it can also fail during a netlink_broadcast() or during | |
2660 | * early boot for call_usermodehelper(). For now treat these | |
2661 | * errors as non-fatal. | |
2662 | */ | |
2663 | printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " | |
2664 | "to call CRDA during init"); | |
2665 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
2666 | /* We want to find out exactly why when debugging */ | |
2667 | WARN_ON(err); | |
734366de | 2668 | #endif |
bcf4f99b | 2669 | } |
734366de | 2670 | |
ae9e4b0d LR |
2671 | /* |
2672 | * Finally, if the user set the module parameter treat it | |
2673 | * as a user hint. | |
2674 | */ | |
2675 | if (!is_world_regdom(ieee80211_regdom)) | |
2676 | regulatory_hint_user(ieee80211_regdom); | |
2677 | ||
b2e1b302 LR |
2678 | return 0; |
2679 | } | |
2680 | ||
2681 | void regulatory_exit(void) | |
2682 | { | |
fe33eb39 | 2683 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2684 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2685 | |
2686 | cancel_work_sync(®_work); | |
2687 | ||
a1794390 | 2688 | mutex_lock(&cfg80211_mutex); |
abc7381b | 2689 | mutex_lock(®_mutex); |
734366de | 2690 | |
b2e1b302 | 2691 | reset_regdomains(); |
734366de | 2692 | |
3f2355cb LR |
2693 | kfree(country_ie_regdomain); |
2694 | country_ie_regdomain = NULL; | |
2695 | ||
f6037d09 JB |
2696 | kfree(last_request); |
2697 | ||
b2e1b302 | 2698 | platform_device_unregister(reg_pdev); |
734366de | 2699 | |
e38f8a7a LR |
2700 | spin_lock_bh(®_pending_beacons_lock); |
2701 | if (!list_empty(®_pending_beacons)) { | |
2702 | list_for_each_entry_safe(reg_beacon, btmp, | |
2703 | ®_pending_beacons, list) { | |
2704 | list_del(®_beacon->list); | |
2705 | kfree(reg_beacon); | |
2706 | } | |
2707 | } | |
2708 | spin_unlock_bh(®_pending_beacons_lock); | |
2709 | ||
2710 | if (!list_empty(®_beacon_list)) { | |
2711 | list_for_each_entry_safe(reg_beacon, btmp, | |
2712 | ®_beacon_list, list) { | |
2713 | list_del(®_beacon->list); | |
2714 | kfree(reg_beacon); | |
2715 | } | |
2716 | } | |
2717 | ||
fe33eb39 LR |
2718 | spin_lock(®_requests_lock); |
2719 | if (!list_empty(®_requests_list)) { | |
2720 | list_for_each_entry_safe(reg_request, tmp, | |
2721 | ®_requests_list, list) { | |
2722 | list_del(®_request->list); | |
2723 | kfree(reg_request); | |
2724 | } | |
2725 | } | |
2726 | spin_unlock(®_requests_lock); | |
2727 | ||
abc7381b | 2728 | mutex_unlock(®_mutex); |
a1794390 | 2729 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2730 | } |