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