Commit | Line | Data |
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8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
b2e1b302 | 5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
8318d78a JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
b2e1b302 LR |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
14 | * |
15 | * The usual implementation is for a driver to read a device EEPROM to | |
16 | * determine which regulatory domain it should be operating under, then | |
17 | * looking up the allowable channels in a driver-local table and finally | |
18 | * registering those channels in the wiphy structure. | |
19 | * | |
b2e1b302 LR |
20 | * Another set of compliance enforcement is for drivers to use their |
21 | * own compliance limits which can be stored on the EEPROM. The host | |
22 | * driver or firmware may ensure these are used. | |
23 | * | |
24 | * In addition to all this we provide an extra layer of regulatory | |
25 | * conformance. For drivers which do not have any regulatory | |
26 | * information CRDA provides the complete regulatory solution. | |
27 | * For others it provides a community effort on further restrictions | |
28 | * to enhance compliance. | |
29 | * | |
30 | * Note: When number of rules --> infinity we will not be able to | |
31 | * index on alpha2 any more, instead we'll probably have to | |
32 | * rely on some SHA1 checksum of the regdomain for example. | |
33 | * | |
8318d78a JB |
34 | */ |
35 | #include <linux/kernel.h> | |
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" |
73d54c9e | 43 | #include "nl80211.h" |
8318d78a | 44 | |
5166ccd2 | 45 | /* Receipt of information from last regulatory request */ |
f6037d09 | 46 | static struct regulatory_request *last_request; |
734366de | 47 | |
b2e1b302 LR |
48 | /* To trigger userspace events */ |
49 | static struct platform_device *reg_pdev; | |
8318d78a | 50 | |
fb1fc7ad LR |
51 | /* |
52 | * Central wireless core regulatory domains, we only need two, | |
734366de | 53 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
54 | * information to give us an alpha2 |
55 | */ | |
f130347c | 56 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 57 | |
fb1fc7ad LR |
58 | /* |
59 | * We use this as a place for the rd structure built from the | |
3f2355cb | 60 | * last parsed country IE to rest until CRDA gets back to us with |
fb1fc7ad LR |
61 | * what it thinks should apply for the same country |
62 | */ | |
3f2355cb LR |
63 | static const struct ieee80211_regdomain *country_ie_regdomain; |
64 | ||
abc7381b LR |
65 | /* |
66 | * Protects static reg.c components: | |
67 | * - cfg80211_world_regdom | |
68 | * - cfg80211_regdom | |
69 | * - country_ie_regdomain | |
70 | * - last_request | |
71 | */ | |
72 | DEFINE_MUTEX(reg_mutex); | |
73 | #define assert_reg_lock() WARN_ON(!mutex_is_locked(®_mutex)) | |
74 | ||
e38f8a7a | 75 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
76 | static LIST_HEAD(reg_requests_list); |
77 | static spinlock_t reg_requests_lock; | |
78 | ||
e38f8a7a LR |
79 | /* Used to queue up beacon hints for review */ |
80 | static LIST_HEAD(reg_pending_beacons); | |
81 | static spinlock_t reg_pending_beacons_lock; | |
82 | ||
83 | /* Used to keep track of processed beacon hints */ | |
84 | static LIST_HEAD(reg_beacon_list); | |
85 | ||
86 | struct reg_beacon { | |
87 | struct list_head list; | |
88 | struct ieee80211_channel chan; | |
89 | }; | |
90 | ||
734366de JB |
91 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
92 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 93 | .n_reg_rules = 5, |
734366de JB |
94 | .alpha2 = "00", |
95 | .reg_rules = { | |
68798a62 LR |
96 | /* IEEE 802.11b/g, channels 1..11 */ |
97 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
98 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
99 | * channel fits here. */ | |
100 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
101 | NL80211_RRF_PASSIVE_SCAN | |
102 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
103 | /* IEEE 802.11 channel 14 - Only JP enables |
104 | * this and for 802.11b only */ | |
105 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
106 | NL80211_RRF_PASSIVE_SCAN | | |
107 | NL80211_RRF_NO_IBSS | | |
108 | NL80211_RRF_NO_OFDM), | |
109 | /* IEEE 802.11a, channel 36..48 */ | |
ec329ace | 110 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
111 | NL80211_RRF_PASSIVE_SCAN | |
112 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
113 | |
114 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
115 | ||
116 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 117 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
118 | NL80211_RRF_PASSIVE_SCAN | |
119 | NL80211_RRF_NO_IBSS), | |
734366de JB |
120 | } |
121 | }; | |
122 | ||
a3d2eaf0 JB |
123 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
124 | &world_regdom; | |
734366de | 125 | |
6ee7d330 | 126 | static char *ieee80211_regdom = "00"; |
6ee7d330 | 127 | |
734366de JB |
128 | module_param(ieee80211_regdom, charp, 0444); |
129 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
130 | ||
6ee7d330 | 131 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY |
fb1fc7ad LR |
132 | /* |
133 | * We assume 40 MHz bandwidth for the old regulatory work. | |
734366de | 134 | * We make emphasis we are using the exact same frequencies |
fb1fc7ad LR |
135 | * as before |
136 | */ | |
734366de JB |
137 | |
138 | static const struct ieee80211_regdomain us_regdom = { | |
139 | .n_reg_rules = 6, | |
140 | .alpha2 = "US", | |
141 | .reg_rules = { | |
142 | /* IEEE 802.11b/g, channels 1..11 */ | |
143 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
65182b9f JL |
144 | /* IEEE 802.11a, channel 36..48 */ |
145 | REG_RULE(5180-10, 5240+10, 40, 6, 17, 0), | |
734366de | 146 | /* IEEE 802.11a, channels 48..64 */ |
65182b9f JL |
147 | REG_RULE(5260-10, 5320+10, 40, 6, 20, NL80211_RRF_DFS), |
148 | /* IEEE 802.11a, channels 100..124 */ | |
149 | REG_RULE(5500-10, 5590+10, 40, 6, 20, NL80211_RRF_DFS), | |
150 | /* IEEE 802.11a, channels 132..144 */ | |
151 | REG_RULE(5660-10, 5700+10, 40, 6, 20, NL80211_RRF_DFS), | |
734366de JB |
152 | /* IEEE 802.11a, channels 149..165, outdoor */ |
153 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
154 | } | |
155 | }; | |
156 | ||
157 | static const struct ieee80211_regdomain jp_regdom = { | |
65182b9f | 158 | .n_reg_rules = 6, |
734366de JB |
159 | .alpha2 = "JP", |
160 | .reg_rules = { | |
65182b9f JL |
161 | /* IEEE 802.11b/g, channels 1..11 */ |
162 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
163 | /* IEEE 802.11b/g, channels 12..13 */ | |
164 | REG_RULE(2467-10, 2472+10, 20, 6, 20, 0), | |
165 | /* IEEE 802.11b/g, channel 14 */ | |
166 | REG_RULE(2484-10, 2484+10, 20, 6, 20, NL80211_RRF_NO_OFDM), | |
167 | /* IEEE 802.11a, channels 36..48 */ | |
168 | REG_RULE(5180-10, 5240+10, 40, 6, 20, 0), | |
734366de | 169 | /* IEEE 802.11a, channels 52..64 */ |
65182b9f JL |
170 | REG_RULE(5260-10, 5320+10, 40, 6, 20, NL80211_RRF_DFS), |
171 | /* IEEE 802.11a, channels 100..144 */ | |
172 | REG_RULE(5500-10, 5700+10, 40, 6, 23, NL80211_RRF_DFS), | |
734366de JB |
173 | } |
174 | }; | |
175 | ||
176 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
177 | { | |
178 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
179 | return &us_regdom; | |
180 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
181 | return &jp_regdom; | |
65182b9f JL |
182 | /* Use world roaming rules for "EU", since it was a pseudo |
183 | domain anyway... */ | |
734366de | 184 | if (alpha2[0] == 'E' && alpha2[1] == 'U') |
65182b9f JL |
185 | return &world_regdom; |
186 | /* Default, world roaming rules */ | |
187 | return &world_regdom; | |
734366de JB |
188 | } |
189 | ||
a3d2eaf0 | 190 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de | 191 | { |
65182b9f | 192 | if (rd == &us_regdom || rd == &jp_regdom || rd == &world_regdom) |
734366de JB |
193 | return true; |
194 | return false; | |
195 | } | |
942b25cf JB |
196 | #else |
197 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 198 | { |
942b25cf | 199 | return false; |
734366de | 200 | } |
942b25cf JB |
201 | #endif |
202 | ||
734366de JB |
203 | static void reset_regdomains(void) |
204 | { | |
942b25cf JB |
205 | /* avoid freeing static information or freeing something twice */ |
206 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
207 | cfg80211_regdomain = NULL; | |
208 | if (cfg80211_world_regdom == &world_regdom) | |
209 | cfg80211_world_regdom = NULL; | |
210 | if (cfg80211_regdomain == &world_regdom) | |
211 | cfg80211_regdomain = NULL; | |
212 | if (is_old_static_regdom(cfg80211_regdomain)) | |
213 | cfg80211_regdomain = NULL; | |
214 | ||
215 | kfree(cfg80211_regdomain); | |
216 | kfree(cfg80211_world_regdom); | |
734366de | 217 | |
a3d2eaf0 | 218 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
219 | cfg80211_regdomain = NULL; |
220 | } | |
221 | ||
fb1fc7ad LR |
222 | /* |
223 | * Dynamic world regulatory domain requested by the wireless | |
224 | * core upon initialization | |
225 | */ | |
a3d2eaf0 | 226 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 227 | { |
f6037d09 | 228 | BUG_ON(!last_request); |
734366de JB |
229 | |
230 | reset_regdomains(); | |
231 | ||
232 | cfg80211_world_regdom = rd; | |
233 | cfg80211_regdomain = rd; | |
234 | } | |
734366de | 235 | |
a3d2eaf0 | 236 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
237 | { |
238 | if (!alpha2) | |
239 | return false; | |
240 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
241 | return true; | |
242 | return false; | |
243 | } | |
8318d78a | 244 | |
a3d2eaf0 | 245 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
246 | { |
247 | if (!alpha2) | |
248 | return false; | |
249 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
250 | return true; | |
251 | return false; | |
252 | } | |
8318d78a | 253 | |
b2e1b302 LR |
254 | static bool is_alpha_upper(char letter) |
255 | { | |
256 | /* ASCII A - Z */ | |
257 | if (letter >= 65 && letter <= 90) | |
258 | return true; | |
259 | return false; | |
260 | } | |
8318d78a | 261 | |
a3d2eaf0 | 262 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
263 | { |
264 | if (!alpha2) | |
265 | return false; | |
fb1fc7ad LR |
266 | /* |
267 | * Special case where regulatory domain was built by driver | |
268 | * but a specific alpha2 cannot be determined | |
269 | */ | |
b2e1b302 LR |
270 | if (alpha2[0] == '9' && alpha2[1] == '9') |
271 | return true; | |
272 | return false; | |
273 | } | |
8318d78a | 274 | |
3f2355cb LR |
275 | static bool is_intersected_alpha2(const char *alpha2) |
276 | { | |
277 | if (!alpha2) | |
278 | return false; | |
fb1fc7ad LR |
279 | /* |
280 | * Special case where regulatory domain is the | |
3f2355cb | 281 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
282 | * structures |
283 | */ | |
3f2355cb LR |
284 | if (alpha2[0] == '9' && alpha2[1] == '8') |
285 | return true; | |
286 | return false; | |
287 | } | |
288 | ||
a3d2eaf0 | 289 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
290 | { |
291 | if (!alpha2) | |
292 | return false; | |
293 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
294 | return true; | |
295 | return false; | |
296 | } | |
8318d78a | 297 | |
a3d2eaf0 | 298 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
299 | { |
300 | if (!alpha2_x || !alpha2_y) | |
301 | return false; | |
302 | if (alpha2_x[0] == alpha2_y[0] && | |
303 | alpha2_x[1] == alpha2_y[1]) | |
304 | return true; | |
305 | return false; | |
306 | } | |
307 | ||
69b1572b | 308 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 309 | { |
761cf7ec LR |
310 | assert_cfg80211_lock(); |
311 | ||
b2e1b302 LR |
312 | if (!cfg80211_regdomain) |
313 | return true; | |
314 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
315 | return false; | |
316 | return true; | |
317 | } | |
318 | ||
3f2355cb LR |
319 | /** |
320 | * country_ie_integrity_changes - tells us if the country IE has changed | |
321 | * @checksum: checksum of country IE of fields we are interested in | |
322 | * | |
323 | * If the country IE has not changed you can ignore it safely. This is | |
324 | * useful to determine if two devices are seeing two different country IEs | |
325 | * even on the same alpha2. Note that this will return false if no IE has | |
326 | * been set on the wireless core yet. | |
327 | */ | |
328 | static bool country_ie_integrity_changes(u32 checksum) | |
329 | { | |
330 | /* If no IE has been set then the checksum doesn't change */ | |
331 | if (unlikely(!last_request->country_ie_checksum)) | |
332 | return false; | |
333 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
334 | return true; | |
335 | return false; | |
336 | } | |
337 | ||
fb1fc7ad LR |
338 | /* |
339 | * This lets us keep regulatory code which is updated on a regulatory | |
340 | * basis in userspace. | |
341 | */ | |
b2e1b302 LR |
342 | static int call_crda(const char *alpha2) |
343 | { | |
344 | char country_env[9 + 2] = "COUNTRY="; | |
345 | char *envp[] = { | |
346 | country_env, | |
347 | NULL | |
348 | }; | |
349 | ||
350 | if (!is_world_regdom((char *) alpha2)) | |
351 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
352 | alpha2[0], alpha2[1]); | |
353 | else | |
b2e1b302 LR |
354 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
355 | "regulatory domain\n"); | |
b2e1b302 LR |
356 | |
357 | country_env[8] = alpha2[0]; | |
358 | country_env[9] = alpha2[1]; | |
359 | ||
360 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
361 | } | |
362 | ||
b2e1b302 | 363 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 364 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 365 | { |
61405e97 LR |
366 | assert_cfg80211_lock(); |
367 | ||
f6037d09 JB |
368 | if (!last_request) |
369 | return false; | |
370 | ||
371 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 372 | } |
8318d78a | 373 | |
b2e1b302 | 374 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 375 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 376 | { |
a3d2eaf0 | 377 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
378 | u32 freq_diff; |
379 | ||
91e99004 | 380 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
381 | return false; |
382 | ||
383 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
384 | return false; | |
385 | ||
386 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
387 | ||
bd05f28e RK |
388 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
389 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
390 | return false; |
391 | ||
392 | return true; | |
393 | } | |
394 | ||
a3d2eaf0 | 395 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 396 | { |
a3d2eaf0 | 397 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 398 | unsigned int i; |
8318d78a | 399 | |
b2e1b302 LR |
400 | if (!rd->n_reg_rules) |
401 | return false; | |
8318d78a | 402 | |
88dc1c3f LR |
403 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
404 | return false; | |
405 | ||
b2e1b302 LR |
406 | for (i = 0; i < rd->n_reg_rules; i++) { |
407 | reg_rule = &rd->reg_rules[i]; | |
408 | if (!is_valid_reg_rule(reg_rule)) | |
409 | return false; | |
410 | } | |
411 | ||
412 | return true; | |
8318d78a JB |
413 | } |
414 | ||
038659e7 LR |
415 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, |
416 | u32 center_freq_khz, | |
417 | u32 bw_khz) | |
b2e1b302 | 418 | { |
038659e7 LR |
419 | u32 start_freq_khz, end_freq_khz; |
420 | ||
421 | start_freq_khz = center_freq_khz - (bw_khz/2); | |
422 | end_freq_khz = center_freq_khz + (bw_khz/2); | |
423 | ||
424 | if (start_freq_khz >= freq_range->start_freq_khz && | |
425 | end_freq_khz <= freq_range->end_freq_khz) | |
426 | return true; | |
427 | ||
428 | return false; | |
b2e1b302 | 429 | } |
8318d78a | 430 | |
0c7dc45d LR |
431 | /** |
432 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
433 | * @freq_range: frequency rule we want to query | |
434 | * @freq_khz: frequency we are inquiring about | |
435 | * | |
436 | * This lets us know if a specific frequency rule is or is not relevant to | |
437 | * a specific frequency's band. Bands are device specific and artificial | |
438 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
439 | * safe for now to assume that a frequency rule should not be part of a | |
440 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
441 | * This resolution can be lowered and should be considered as we add | |
442 | * regulatory rule support for other "bands". | |
443 | **/ | |
444 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
445 | u32 freq_khz) | |
446 | { | |
447 | #define ONE_GHZ_IN_KHZ 1000000 | |
448 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
449 | return true; | |
450 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
451 | return true; | |
452 | return false; | |
453 | #undef ONE_GHZ_IN_KHZ | |
454 | } | |
455 | ||
fb1fc7ad LR |
456 | /* |
457 | * Converts a country IE to a regulatory domain. A regulatory domain | |
3f2355cb LR |
458 | * structure has a lot of information which the IE doesn't yet have, |
459 | * so for the other values we use upper max values as we will intersect | |
fb1fc7ad LR |
460 | * with our userspace regulatory agent to get lower bounds. |
461 | */ | |
3f2355cb LR |
462 | static struct ieee80211_regdomain *country_ie_2_rd( |
463 | u8 *country_ie, | |
464 | u8 country_ie_len, | |
465 | u32 *checksum) | |
466 | { | |
467 | struct ieee80211_regdomain *rd = NULL; | |
468 | unsigned int i = 0; | |
469 | char alpha2[2]; | |
470 | u32 flags = 0; | |
471 | u32 num_rules = 0, size_of_regd = 0; | |
472 | u8 *triplets_start = NULL; | |
473 | u8 len_at_triplet = 0; | |
474 | /* the last channel we have registered in a subband (triplet) */ | |
475 | int last_sub_max_channel = 0; | |
476 | ||
477 | *checksum = 0xDEADBEEF; | |
478 | ||
479 | /* Country IE requirements */ | |
480 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
481 | country_ie_len & 0x01); | |
482 | ||
483 | alpha2[0] = country_ie[0]; | |
484 | alpha2[1] = country_ie[1]; | |
485 | ||
486 | /* | |
487 | * Third octet can be: | |
488 | * 'I' - Indoor | |
489 | * 'O' - Outdoor | |
490 | * | |
491 | * anything else we assume is no restrictions | |
492 | */ | |
493 | if (country_ie[2] == 'I') | |
494 | flags = NL80211_RRF_NO_OUTDOOR; | |
495 | else if (country_ie[2] == 'O') | |
496 | flags = NL80211_RRF_NO_INDOOR; | |
497 | ||
498 | country_ie += 3; | |
499 | country_ie_len -= 3; | |
500 | ||
501 | triplets_start = country_ie; | |
502 | len_at_triplet = country_ie_len; | |
503 | ||
504 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
505 | ||
fb1fc7ad LR |
506 | /* |
507 | * We need to build a reg rule for each triplet, but first we must | |
3f2355cb | 508 | * calculate the number of reg rules we will need. We will need one |
fb1fc7ad LR |
509 | * for each channel subband |
510 | */ | |
3f2355cb | 511 | while (country_ie_len >= 3) { |
615aab4b | 512 | int end_channel = 0; |
3f2355cb LR |
513 | struct ieee80211_country_ie_triplet *triplet = |
514 | (struct ieee80211_country_ie_triplet *) country_ie; | |
515 | int cur_sub_max_channel = 0, cur_channel = 0; | |
516 | ||
517 | if (triplet->ext.reg_extension_id >= | |
518 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
519 | country_ie += 3; | |
520 | country_ie_len -= 3; | |
521 | continue; | |
522 | } | |
523 | ||
615aab4b LR |
524 | /* 2 GHz */ |
525 | if (triplet->chans.first_channel <= 14) | |
526 | end_channel = triplet->chans.first_channel + | |
527 | triplet->chans.num_channels; | |
528 | else | |
529 | /* | |
530 | * 5 GHz -- For example in country IEs if the first | |
531 | * channel given is 36 and the number of channels is 4 | |
532 | * then the individual channel numbers defined for the | |
533 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
534 | * and not 36, 37, 38, 39. | |
535 | * | |
536 | * See: http://tinyurl.com/11d-clarification | |
537 | */ | |
538 | end_channel = triplet->chans.first_channel + | |
539 | (4 * (triplet->chans.num_channels - 1)); | |
540 | ||
3f2355cb | 541 | cur_channel = triplet->chans.first_channel; |
615aab4b | 542 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
543 | |
544 | /* Basic sanity check */ | |
545 | if (cur_sub_max_channel < cur_channel) | |
546 | return NULL; | |
547 | ||
fb1fc7ad LR |
548 | /* |
549 | * Do not allow overlapping channels. Also channels | |
3f2355cb | 550 | * passed in each subband must be monotonically |
fb1fc7ad LR |
551 | * increasing |
552 | */ | |
3f2355cb LR |
553 | if (last_sub_max_channel) { |
554 | if (cur_channel <= last_sub_max_channel) | |
555 | return NULL; | |
556 | if (cur_sub_max_channel <= last_sub_max_channel) | |
557 | return NULL; | |
558 | } | |
559 | ||
fb1fc7ad LR |
560 | /* |
561 | * When dot11RegulatoryClassesRequired is supported | |
3f2355cb LR |
562 | * we can throw ext triplets as part of this soup, |
563 | * for now we don't care when those change as we | |
fb1fc7ad LR |
564 | * don't support them |
565 | */ | |
3f2355cb LR |
566 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | |
567 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
568 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
569 | ||
570 | last_sub_max_channel = cur_sub_max_channel; | |
571 | ||
572 | country_ie += 3; | |
573 | country_ie_len -= 3; | |
574 | num_rules++; | |
575 | ||
fb1fc7ad LR |
576 | /* |
577 | * Note: this is not a IEEE requirement but | |
578 | * simply a memory requirement | |
579 | */ | |
3f2355cb LR |
580 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) |
581 | return NULL; | |
582 | } | |
583 | ||
584 | country_ie = triplets_start; | |
585 | country_ie_len = len_at_triplet; | |
586 | ||
587 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
588 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
589 | ||
590 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
591 | if (!rd) | |
592 | return NULL; | |
593 | ||
594 | rd->n_reg_rules = num_rules; | |
595 | rd->alpha2[0] = alpha2[0]; | |
596 | rd->alpha2[1] = alpha2[1]; | |
597 | ||
598 | /* This time around we fill in the rd */ | |
599 | while (country_ie_len >= 3) { | |
02e68a3d | 600 | int end_channel = 0; |
3f2355cb LR |
601 | struct ieee80211_country_ie_triplet *triplet = |
602 | (struct ieee80211_country_ie_triplet *) country_ie; | |
603 | struct ieee80211_reg_rule *reg_rule = NULL; | |
604 | struct ieee80211_freq_range *freq_range = NULL; | |
605 | struct ieee80211_power_rule *power_rule = NULL; | |
606 | ||
fb1fc7ad LR |
607 | /* |
608 | * Must parse if dot11RegulatoryClassesRequired is true, | |
609 | * we don't support this yet | |
610 | */ | |
3f2355cb LR |
611 | if (triplet->ext.reg_extension_id >= |
612 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
613 | country_ie += 3; | |
614 | country_ie_len -= 3; | |
615 | continue; | |
616 | } | |
617 | ||
618 | reg_rule = &rd->reg_rules[i]; | |
619 | freq_range = ®_rule->freq_range; | |
620 | power_rule = ®_rule->power_rule; | |
621 | ||
622 | reg_rule->flags = flags; | |
623 | ||
02e68a3d LR |
624 | /* 2 GHz */ |
625 | if (triplet->chans.first_channel <= 14) | |
626 | end_channel = triplet->chans.first_channel + | |
627 | triplet->chans.num_channels; | |
628 | else | |
02e68a3d LR |
629 | end_channel = triplet->chans.first_channel + |
630 | (4 * (triplet->chans.num_channels - 1)); | |
631 | ||
fb1fc7ad LR |
632 | /* |
633 | * The +10 is since the regulatory domain expects | |
3f2355cb LR |
634 | * the actual band edge, not the center of freq for |
635 | * its start and end freqs, assuming 20 MHz bandwidth on | |
fb1fc7ad LR |
636 | * the channels passed |
637 | */ | |
3f2355cb LR |
638 | freq_range->start_freq_khz = |
639 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
640 | triplet->chans.first_channel) - 10); | |
641 | freq_range->end_freq_khz = | |
642 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 643 | end_channel) + 10); |
3f2355cb | 644 | |
fb1fc7ad LR |
645 | /* |
646 | * These are large arbitrary values we use to intersect later. | |
647 | * Increment this if we ever support >= 40 MHz channels | |
648 | * in IEEE 802.11 | |
649 | */ | |
3f2355cb LR |
650 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); |
651 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
652 | power_rule->max_eirp = DBM_TO_MBM(100); | |
653 | ||
654 | country_ie += 3; | |
655 | country_ie_len -= 3; | |
656 | i++; | |
657 | ||
658 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
659 | } | |
660 | ||
661 | return rd; | |
662 | } | |
663 | ||
664 | ||
fb1fc7ad LR |
665 | /* |
666 | * Helper for regdom_intersect(), this does the real | |
667 | * mathematical intersection fun | |
668 | */ | |
9c96477d LR |
669 | static int reg_rules_intersect( |
670 | const struct ieee80211_reg_rule *rule1, | |
671 | const struct ieee80211_reg_rule *rule2, | |
672 | struct ieee80211_reg_rule *intersected_rule) | |
673 | { | |
674 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
675 | struct ieee80211_freq_range *freq_range; | |
676 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
677 | struct ieee80211_power_rule *power_rule; | |
678 | u32 freq_diff; | |
679 | ||
680 | freq_range1 = &rule1->freq_range; | |
681 | freq_range2 = &rule2->freq_range; | |
682 | freq_range = &intersected_rule->freq_range; | |
683 | ||
684 | power_rule1 = &rule1->power_rule; | |
685 | power_rule2 = &rule2->power_rule; | |
686 | power_rule = &intersected_rule->power_rule; | |
687 | ||
688 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
689 | freq_range2->start_freq_khz); | |
690 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
691 | freq_range2->end_freq_khz); | |
692 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
693 | freq_range2->max_bandwidth_khz); | |
694 | ||
695 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
696 | if (freq_range->max_bandwidth_khz > freq_diff) | |
697 | freq_range->max_bandwidth_khz = freq_diff; | |
698 | ||
699 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
700 | power_rule2->max_eirp); | |
701 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
702 | power_rule2->max_antenna_gain); | |
703 | ||
704 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
705 | ||
706 | if (!is_valid_reg_rule(intersected_rule)) | |
707 | return -EINVAL; | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
712 | /** | |
713 | * regdom_intersect - do the intersection between two regulatory domains | |
714 | * @rd1: first regulatory domain | |
715 | * @rd2: second regulatory domain | |
716 | * | |
717 | * Use this function to get the intersection between two regulatory domains. | |
718 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
719 | * as no one single alpha2 can represent this regulatory domain. | |
720 | * | |
721 | * Returns a pointer to the regulatory domain structure which will hold the | |
722 | * resulting intersection of rules between rd1 and rd2. We will | |
723 | * kzalloc() this structure for you. | |
724 | */ | |
725 | static struct ieee80211_regdomain *regdom_intersect( | |
726 | const struct ieee80211_regdomain *rd1, | |
727 | const struct ieee80211_regdomain *rd2) | |
728 | { | |
729 | int r, size_of_regd; | |
730 | unsigned int x, y; | |
731 | unsigned int num_rules = 0, rule_idx = 0; | |
732 | const struct ieee80211_reg_rule *rule1, *rule2; | |
733 | struct ieee80211_reg_rule *intersected_rule; | |
734 | struct ieee80211_regdomain *rd; | |
735 | /* This is just a dummy holder to help us count */ | |
736 | struct ieee80211_reg_rule irule; | |
737 | ||
738 | /* Uses the stack temporarily for counter arithmetic */ | |
739 | intersected_rule = &irule; | |
740 | ||
741 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
742 | ||
743 | if (!rd1 || !rd2) | |
744 | return NULL; | |
745 | ||
fb1fc7ad LR |
746 | /* |
747 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
748 | * build them. This is to so we can malloc() and free() a |
749 | * regdomain once. The reason we use reg_rules_intersect() here | |
750 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
751 | * All rules that do check out OK are valid. |
752 | */ | |
9c96477d LR |
753 | |
754 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
755 | rule1 = &rd1->reg_rules[x]; | |
756 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
757 | rule2 = &rd2->reg_rules[y]; | |
758 | if (!reg_rules_intersect(rule1, rule2, | |
759 | intersected_rule)) | |
760 | num_rules++; | |
761 | memset(intersected_rule, 0, | |
762 | sizeof(struct ieee80211_reg_rule)); | |
763 | } | |
764 | } | |
765 | ||
766 | if (!num_rules) | |
767 | return NULL; | |
768 | ||
769 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
770 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
771 | ||
772 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
773 | if (!rd) | |
774 | return NULL; | |
775 | ||
776 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
777 | rule1 = &rd1->reg_rules[x]; | |
778 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
779 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
780 | /* |
781 | * This time around instead of using the stack lets | |
9c96477d | 782 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
783 | * a memcpy() |
784 | */ | |
9c96477d LR |
785 | intersected_rule = &rd->reg_rules[rule_idx]; |
786 | r = reg_rules_intersect(rule1, rule2, | |
787 | intersected_rule); | |
fb1fc7ad LR |
788 | /* |
789 | * No need to memset here the intersected rule here as | |
790 | * we're not using the stack anymore | |
791 | */ | |
9c96477d LR |
792 | if (r) |
793 | continue; | |
794 | rule_idx++; | |
795 | } | |
796 | } | |
797 | ||
798 | if (rule_idx != num_rules) { | |
799 | kfree(rd); | |
800 | return NULL; | |
801 | } | |
802 | ||
803 | rd->n_reg_rules = num_rules; | |
804 | rd->alpha2[0] = '9'; | |
805 | rd->alpha2[1] = '8'; | |
806 | ||
807 | return rd; | |
808 | } | |
809 | ||
fb1fc7ad LR |
810 | /* |
811 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
812 | * want to just have the channel structure use these | |
813 | */ | |
b2e1b302 LR |
814 | static u32 map_regdom_flags(u32 rd_flags) |
815 | { | |
816 | u32 channel_flags = 0; | |
817 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
818 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
819 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
820 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
821 | if (rd_flags & NL80211_RRF_DFS) | |
822 | channel_flags |= IEEE80211_CHAN_RADAR; | |
823 | return channel_flags; | |
824 | } | |
825 | ||
1fa25e41 LR |
826 | static int freq_reg_info_regd(struct wiphy *wiphy, |
827 | u32 center_freq, | |
038659e7 | 828 | u32 desired_bw_khz, |
1fa25e41 LR |
829 | const struct ieee80211_reg_rule **reg_rule, |
830 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
831 | { |
832 | int i; | |
0c7dc45d | 833 | bool band_rule_found = false; |
3e0c3ff3 | 834 | const struct ieee80211_regdomain *regd; |
038659e7 LR |
835 | bool bw_fits = false; |
836 | ||
837 | if (!desired_bw_khz) | |
838 | desired_bw_khz = MHZ_TO_KHZ(20); | |
8318d78a | 839 | |
1fa25e41 | 840 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 841 | |
fb1fc7ad LR |
842 | /* |
843 | * Follow the driver's regulatory domain, if present, unless a country | |
844 | * IE has been processed or a user wants to help complaince further | |
845 | */ | |
7db90f4a LR |
846 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
847 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && | |
3e0c3ff3 LR |
848 | wiphy->regd) |
849 | regd = wiphy->regd; | |
850 | ||
851 | if (!regd) | |
b2e1b302 LR |
852 | return -EINVAL; |
853 | ||
3e0c3ff3 | 854 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
855 | const struct ieee80211_reg_rule *rr; |
856 | const struct ieee80211_freq_range *fr = NULL; | |
857 | const struct ieee80211_power_rule *pr = NULL; | |
858 | ||
3e0c3ff3 | 859 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
860 | fr = &rr->freq_range; |
861 | pr = &rr->power_rule; | |
0c7dc45d | 862 | |
fb1fc7ad LR |
863 | /* |
864 | * We only need to know if one frequency rule was | |
0c7dc45d | 865 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
866 | * not overwrite it once found |
867 | */ | |
0c7dc45d LR |
868 | if (!band_rule_found) |
869 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
870 | ||
038659e7 LR |
871 | bw_fits = reg_does_bw_fit(fr, |
872 | center_freq, | |
873 | desired_bw_khz); | |
0c7dc45d | 874 | |
038659e7 | 875 | if (band_rule_found && bw_fits) { |
b2e1b302 | 876 | *reg_rule = rr; |
038659e7 | 877 | return 0; |
8318d78a JB |
878 | } |
879 | } | |
880 | ||
0c7dc45d LR |
881 | if (!band_rule_found) |
882 | return -ERANGE; | |
883 | ||
038659e7 | 884 | return -EINVAL; |
b2e1b302 | 885 | } |
34f57347 | 886 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 887 | |
038659e7 LR |
888 | int freq_reg_info(struct wiphy *wiphy, |
889 | u32 center_freq, | |
890 | u32 desired_bw_khz, | |
891 | const struct ieee80211_reg_rule **reg_rule) | |
1fa25e41 | 892 | { |
ac46d48e | 893 | assert_cfg80211_lock(); |
038659e7 LR |
894 | return freq_reg_info_regd(wiphy, |
895 | center_freq, | |
896 | desired_bw_khz, | |
897 | reg_rule, | |
898 | NULL); | |
1fa25e41 | 899 | } |
b2e1b302 | 900 | |
038659e7 LR |
901 | /* |
902 | * Note that right now we assume the desired channel bandwidth | |
903 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz | |
904 | * per channel, the primary and the extension channel). To support | |
905 | * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a | |
906 | * new ieee80211_channel.target_bw and re run the regulatory check | |
907 | * on the wiphy with the target_bw specified. Then we can simply use | |
908 | * that below for the desired_bw_khz below. | |
909 | */ | |
a92a3ce7 LR |
910 | static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, |
911 | unsigned int chan_idx) | |
b2e1b302 LR |
912 | { |
913 | int r; | |
038659e7 LR |
914 | u32 flags, bw_flags = 0; |
915 | u32 desired_bw_khz = MHZ_TO_KHZ(20); | |
b2e1b302 LR |
916 | const struct ieee80211_reg_rule *reg_rule = NULL; |
917 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 918 | const struct ieee80211_freq_range *freq_range = NULL; |
a92a3ce7 LR |
919 | struct ieee80211_supported_band *sband; |
920 | struct ieee80211_channel *chan; | |
fe33eb39 | 921 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 922 | |
761cf7ec LR |
923 | assert_cfg80211_lock(); |
924 | ||
806a9e39 LR |
925 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
926 | ||
a92a3ce7 LR |
927 | sband = wiphy->bands[band]; |
928 | BUG_ON(chan_idx >= sband->n_channels); | |
929 | chan = &sband->channels[chan_idx]; | |
930 | ||
931 | flags = chan->orig_flags; | |
b2e1b302 | 932 | |
038659e7 LR |
933 | r = freq_reg_info(wiphy, |
934 | MHZ_TO_KHZ(chan->center_freq), | |
935 | desired_bw_khz, | |
936 | ®_rule); | |
b2e1b302 LR |
937 | |
938 | if (r) { | |
fb1fc7ad LR |
939 | /* |
940 | * This means no regulatory rule was found in the country IE | |
0c7dc45d LR |
941 | * with a frequency range on the center_freq's band, since |
942 | * IEEE-802.11 allows for a country IE to have a subset of the | |
943 | * regulatory information provided in a country we ignore | |
944 | * disabling the channel unless at least one reg rule was | |
945 | * found on the center_freq's band. For details see this | |
946 | * clarification: | |
947 | * | |
948 | * http://tinyurl.com/11d-clarification | |
949 | */ | |
950 | if (r == -ERANGE && | |
7db90f4a LR |
951 | last_request->initiator == |
952 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
0c7dc45d LR |
953 | #ifdef CONFIG_CFG80211_REG_DEBUG |
954 | printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " | |
955 | "intact on %s - no rule found in band on " | |
956 | "Country IE\n", | |
957 | chan->center_freq, wiphy_name(wiphy)); | |
958 | #endif | |
959 | } else { | |
fb1fc7ad LR |
960 | /* |
961 | * In this case we know the country IE has at least one reg rule | |
962 | * for the band so we respect its band definitions | |
963 | */ | |
0c7dc45d | 964 | #ifdef CONFIG_CFG80211_REG_DEBUG |
7db90f4a LR |
965 | if (last_request->initiator == |
966 | NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
0c7dc45d LR |
967 | printk(KERN_DEBUG "cfg80211: Disabling " |
968 | "channel %d MHz on %s due to " | |
969 | "Country IE\n", | |
970 | chan->center_freq, wiphy_name(wiphy)); | |
971 | #endif | |
972 | flags |= IEEE80211_CHAN_DISABLED; | |
973 | chan->flags = flags; | |
974 | } | |
8318d78a JB |
975 | return; |
976 | } | |
977 | ||
b2e1b302 | 978 | power_rule = ®_rule->power_rule; |
038659e7 LR |
979 | freq_range = ®_rule->freq_range; |
980 | ||
981 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
982 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
b2e1b302 | 983 | |
7db90f4a | 984 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
806a9e39 | 985 | request_wiphy && request_wiphy == wiphy && |
5be83de5 | 986 | request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
fb1fc7ad LR |
987 | /* |
988 | * This gaurantees the driver's requested regulatory domain | |
f976376d | 989 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
990 | * settings |
991 | */ | |
f976376d | 992 | chan->flags = chan->orig_flags = |
038659e7 | 993 | map_regdom_flags(reg_rule->flags) | bw_flags; |
f976376d LR |
994 | chan->max_antenna_gain = chan->orig_mag = |
995 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
f976376d LR |
996 | chan->max_power = chan->orig_mpwr = |
997 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
998 | return; | |
999 | } | |
1000 | ||
038659e7 | 1001 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 1002 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 | 1003 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
253898c4 | 1004 | if (chan->orig_mpwr) |
b2e1b302 LR |
1005 | chan->max_power = min(chan->orig_mpwr, |
1006 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 1007 | else |
b2e1b302 | 1008 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
1009 | } |
1010 | ||
a92a3ce7 | 1011 | static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) |
8318d78a | 1012 | { |
a92a3ce7 LR |
1013 | unsigned int i; |
1014 | struct ieee80211_supported_band *sband; | |
1015 | ||
1016 | BUG_ON(!wiphy->bands[band]); | |
1017 | sband = wiphy->bands[band]; | |
8318d78a JB |
1018 | |
1019 | for (i = 0; i < sband->n_channels; i++) | |
a92a3ce7 | 1020 | handle_channel(wiphy, band, i); |
8318d78a JB |
1021 | } |
1022 | ||
7db90f4a LR |
1023 | static bool ignore_reg_update(struct wiphy *wiphy, |
1024 | enum nl80211_reg_initiator initiator) | |
14b9815a LR |
1025 | { |
1026 | if (!last_request) | |
1027 | return true; | |
7db90f4a | 1028 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
5be83de5 | 1029 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) |
14b9815a | 1030 | return true; |
fb1fc7ad LR |
1031 | /* |
1032 | * wiphy->regd will be set once the device has its own | |
1033 | * desired regulatory domain set | |
1034 | */ | |
5be83de5 | 1035 | if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && |
f976376d | 1036 | !is_world_regdom(last_request->alpha2)) |
14b9815a LR |
1037 | return true; |
1038 | return false; | |
1039 | } | |
1040 | ||
7db90f4a | 1041 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
8318d78a | 1042 | { |
79c97e97 | 1043 | struct cfg80211_registered_device *rdev; |
8318d78a | 1044 | |
79c97e97 JB |
1045 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1046 | wiphy_update_regulatory(&rdev->wiphy, initiator); | |
b2e1b302 LR |
1047 | } |
1048 | ||
e38f8a7a LR |
1049 | static void handle_reg_beacon(struct wiphy *wiphy, |
1050 | unsigned int chan_idx, | |
1051 | struct reg_beacon *reg_beacon) | |
1052 | { | |
e38f8a7a LR |
1053 | struct ieee80211_supported_band *sband; |
1054 | struct ieee80211_channel *chan; | |
6bad8766 LR |
1055 | bool channel_changed = false; |
1056 | struct ieee80211_channel chan_before; | |
e38f8a7a LR |
1057 | |
1058 | assert_cfg80211_lock(); | |
1059 | ||
1060 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1061 | chan = &sband->channels[chan_idx]; | |
1062 | ||
1063 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
1064 | return; | |
1065 | ||
6bad8766 LR |
1066 | if (chan->beacon_found) |
1067 | return; | |
1068 | ||
1069 | chan->beacon_found = true; | |
1070 | ||
5be83de5 | 1071 | if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) |
37184244 LR |
1072 | return; |
1073 | ||
6bad8766 LR |
1074 | chan_before.center_freq = chan->center_freq; |
1075 | chan_before.flags = chan->flags; | |
1076 | ||
37184244 | 1077 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { |
e38f8a7a | 1078 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; |
6bad8766 | 1079 | channel_changed = true; |
e38f8a7a LR |
1080 | } |
1081 | ||
37184244 | 1082 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { |
e38f8a7a | 1083 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; |
6bad8766 | 1084 | channel_changed = true; |
e38f8a7a LR |
1085 | } |
1086 | ||
6bad8766 LR |
1087 | if (channel_changed) |
1088 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
e38f8a7a LR |
1089 | } |
1090 | ||
1091 | /* | |
1092 | * Called when a scan on a wiphy finds a beacon on | |
1093 | * new channel | |
1094 | */ | |
1095 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
1096 | struct reg_beacon *reg_beacon) | |
1097 | { | |
1098 | unsigned int i; | |
1099 | struct ieee80211_supported_band *sband; | |
1100 | ||
1101 | assert_cfg80211_lock(); | |
1102 | ||
1103 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1104 | return; | |
1105 | ||
1106 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1107 | ||
1108 | for (i = 0; i < sband->n_channels; i++) | |
1109 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * Called upon reg changes or a new wiphy is added | |
1114 | */ | |
1115 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1116 | { | |
1117 | unsigned int i; | |
1118 | struct ieee80211_supported_band *sband; | |
1119 | struct reg_beacon *reg_beacon; | |
1120 | ||
1121 | assert_cfg80211_lock(); | |
1122 | ||
1123 | if (list_empty(®_beacon_list)) | |
1124 | return; | |
1125 | ||
1126 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1127 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1128 | continue; | |
1129 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1130 | for (i = 0; i < sband->n_channels; i++) | |
1131 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1136 | { | |
1137 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1138 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1139 | return true; | |
b1ed8ddd LR |
1140 | if (last_request && |
1141 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
5be83de5 | 1142 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) |
e38f8a7a LR |
1143 | return true; |
1144 | return false; | |
1145 | } | |
1146 | ||
1147 | /* Reap the advantages of previously found beacons */ | |
1148 | static void reg_process_beacons(struct wiphy *wiphy) | |
1149 | { | |
b1ed8ddd LR |
1150 | /* |
1151 | * Means we are just firing up cfg80211, so no beacons would | |
1152 | * have been processed yet. | |
1153 | */ | |
1154 | if (!last_request) | |
1155 | return; | |
e38f8a7a LR |
1156 | if (!reg_is_world_roaming(wiphy)) |
1157 | return; | |
1158 | wiphy_update_beacon_reg(wiphy); | |
1159 | } | |
1160 | ||
038659e7 LR |
1161 | static bool is_ht40_not_allowed(struct ieee80211_channel *chan) |
1162 | { | |
1163 | if (!chan) | |
1164 | return true; | |
1165 | if (chan->flags & IEEE80211_CHAN_DISABLED) | |
1166 | return true; | |
1167 | /* This would happen when regulatory rules disallow HT40 completely */ | |
1168 | if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) | |
1169 | return true; | |
1170 | return false; | |
1171 | } | |
1172 | ||
1173 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, | |
1174 | enum ieee80211_band band, | |
1175 | unsigned int chan_idx) | |
1176 | { | |
1177 | struct ieee80211_supported_band *sband; | |
1178 | struct ieee80211_channel *channel; | |
1179 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; | |
1180 | unsigned int i; | |
1181 | ||
1182 | assert_cfg80211_lock(); | |
1183 | ||
1184 | sband = wiphy->bands[band]; | |
1185 | BUG_ON(chan_idx >= sband->n_channels); | |
1186 | channel = &sband->channels[chan_idx]; | |
1187 | ||
1188 | if (is_ht40_not_allowed(channel)) { | |
1189 | channel->flags |= IEEE80211_CHAN_NO_HT40; | |
1190 | return; | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * We need to ensure the extension channels exist to | |
1195 | * be able to use HT40- or HT40+, this finds them (or not) | |
1196 | */ | |
1197 | for (i = 0; i < sband->n_channels; i++) { | |
1198 | struct ieee80211_channel *c = &sband->channels[i]; | |
1199 | if (c->center_freq == (channel->center_freq - 20)) | |
1200 | channel_before = c; | |
1201 | if (c->center_freq == (channel->center_freq + 20)) | |
1202 | channel_after = c; | |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * Please note that this assumes target bandwidth is 20 MHz, | |
1207 | * if that ever changes we also need to change the below logic | |
1208 | * to include that as well. | |
1209 | */ | |
1210 | if (is_ht40_not_allowed(channel_before)) | |
689da1b3 | 1211 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 | 1212 | else |
689da1b3 | 1213 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 LR |
1214 | |
1215 | if (is_ht40_not_allowed(channel_after)) | |
689da1b3 | 1216 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 | 1217 | else |
689da1b3 | 1218 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 LR |
1219 | } |
1220 | ||
1221 | static void reg_process_ht_flags_band(struct wiphy *wiphy, | |
1222 | enum ieee80211_band band) | |
1223 | { | |
1224 | unsigned int i; | |
1225 | struct ieee80211_supported_band *sband; | |
1226 | ||
1227 | BUG_ON(!wiphy->bands[band]); | |
1228 | sband = wiphy->bands[band]; | |
1229 | ||
1230 | for (i = 0; i < sband->n_channels; i++) | |
1231 | reg_process_ht_flags_channel(wiphy, band, i); | |
1232 | } | |
1233 | ||
1234 | static void reg_process_ht_flags(struct wiphy *wiphy) | |
1235 | { | |
1236 | enum ieee80211_band band; | |
1237 | ||
1238 | if (!wiphy) | |
1239 | return; | |
1240 | ||
1241 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1242 | if (wiphy->bands[band]) | |
1243 | reg_process_ht_flags_band(wiphy, band); | |
1244 | } | |
1245 | ||
1246 | } | |
1247 | ||
7db90f4a LR |
1248 | void wiphy_update_regulatory(struct wiphy *wiphy, |
1249 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1250 | { |
1251 | enum ieee80211_band band; | |
d46e5b1d | 1252 | |
7db90f4a | 1253 | if (ignore_reg_update(wiphy, initiator)) |
e38f8a7a | 1254 | goto out; |
b2e1b302 | 1255 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1256 | if (wiphy->bands[band]) |
a92a3ce7 | 1257 | handle_band(wiphy, band); |
b2e1b302 | 1258 | } |
e38f8a7a LR |
1259 | out: |
1260 | reg_process_beacons(wiphy); | |
038659e7 | 1261 | reg_process_ht_flags(wiphy); |
560e28e1 | 1262 | if (wiphy->reg_notifier) |
716f9392 | 1263 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1264 | } |
1265 | ||
1fa25e41 LR |
1266 | static void handle_channel_custom(struct wiphy *wiphy, |
1267 | enum ieee80211_band band, | |
1268 | unsigned int chan_idx, | |
1269 | const struct ieee80211_regdomain *regd) | |
1270 | { | |
1271 | int r; | |
038659e7 LR |
1272 | u32 desired_bw_khz = MHZ_TO_KHZ(20); |
1273 | u32 bw_flags = 0; | |
1fa25e41 LR |
1274 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1275 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 1276 | const struct ieee80211_freq_range *freq_range = NULL; |
1fa25e41 LR |
1277 | struct ieee80211_supported_band *sband; |
1278 | struct ieee80211_channel *chan; | |
1279 | ||
abc7381b | 1280 | assert_reg_lock(); |
ac46d48e | 1281 | |
1fa25e41 LR |
1282 | sband = wiphy->bands[band]; |
1283 | BUG_ON(chan_idx >= sband->n_channels); | |
1284 | chan = &sband->channels[chan_idx]; | |
1285 | ||
038659e7 LR |
1286 | r = freq_reg_info_regd(wiphy, |
1287 | MHZ_TO_KHZ(chan->center_freq), | |
1288 | desired_bw_khz, | |
1289 | ®_rule, | |
1290 | regd); | |
1fa25e41 LR |
1291 | |
1292 | if (r) { | |
1293 | chan->flags = IEEE80211_CHAN_DISABLED; | |
1294 | return; | |
1295 | } | |
1296 | ||
1297 | power_rule = ®_rule->power_rule; | |
038659e7 LR |
1298 | freq_range = ®_rule->freq_range; |
1299 | ||
1300 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1301 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
1fa25e41 | 1302 | |
038659e7 | 1303 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; |
1fa25e41 | 1304 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); |
1fa25e41 LR |
1305 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
1306 | } | |
1307 | ||
1308 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1309 | const struct ieee80211_regdomain *regd) | |
1310 | { | |
1311 | unsigned int i; | |
1312 | struct ieee80211_supported_band *sband; | |
1313 | ||
1314 | BUG_ON(!wiphy->bands[band]); | |
1315 | sband = wiphy->bands[band]; | |
1316 | ||
1317 | for (i = 0; i < sband->n_channels; i++) | |
1318 | handle_channel_custom(wiphy, band, i, regd); | |
1319 | } | |
1320 | ||
1321 | /* Used by drivers prior to wiphy registration */ | |
1322 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1323 | const struct ieee80211_regdomain *regd) | |
1324 | { | |
1325 | enum ieee80211_band band; | |
bbcf3f02 | 1326 | unsigned int bands_set = 0; |
ac46d48e | 1327 | |
abc7381b | 1328 | mutex_lock(®_mutex); |
1fa25e41 | 1329 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
bbcf3f02 LR |
1330 | if (!wiphy->bands[band]) |
1331 | continue; | |
1332 | handle_band_custom(wiphy, band, regd); | |
1333 | bands_set++; | |
b2e1b302 | 1334 | } |
abc7381b | 1335 | mutex_unlock(®_mutex); |
bbcf3f02 LR |
1336 | |
1337 | /* | |
1338 | * no point in calling this if it won't have any effect | |
1339 | * on your device's supportd bands. | |
1340 | */ | |
1341 | WARN_ON(!bands_set); | |
b2e1b302 | 1342 | } |
1fa25e41 LR |
1343 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1344 | ||
3e0c3ff3 LR |
1345 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
1346 | const struct ieee80211_regdomain *src_regd) | |
1347 | { | |
1348 | struct ieee80211_regdomain *regd; | |
1349 | int size_of_regd = 0; | |
1350 | unsigned int i; | |
1351 | ||
1352 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1353 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
1354 | ||
1355 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
1356 | if (!regd) | |
1357 | return -ENOMEM; | |
1358 | ||
1359 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
1360 | ||
1361 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
1362 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
1363 | sizeof(struct ieee80211_reg_rule)); | |
1364 | ||
1365 | *dst_regd = regd; | |
1366 | return 0; | |
1367 | } | |
b2e1b302 | 1368 | |
fb1fc7ad LR |
1369 | /* |
1370 | * Return value which can be used by ignore_request() to indicate | |
1371 | * it has been determined we should intersect two regulatory domains | |
1372 | */ | |
9c96477d LR |
1373 | #define REG_INTERSECT 1 |
1374 | ||
84fa4f43 JB |
1375 | /* This has the logic which determines when a new request |
1376 | * should be ignored. */ | |
2f92cd2e LR |
1377 | static int ignore_request(struct wiphy *wiphy, |
1378 | struct regulatory_request *pending_request) | |
84fa4f43 | 1379 | { |
806a9e39 | 1380 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1381 | |
1382 | assert_cfg80211_lock(); | |
1383 | ||
84fa4f43 JB |
1384 | /* All initial requests are respected */ |
1385 | if (!last_request) | |
1386 | return 0; | |
1387 | ||
2f92cd2e | 1388 | switch (pending_request->initiator) { |
7db90f4a | 1389 | case NL80211_REGDOM_SET_BY_CORE: |
ba25c141 | 1390 | return -EINVAL; |
7db90f4a | 1391 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1392 | |
1393 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1394 | ||
2f92cd2e | 1395 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1396 | return -EINVAL; |
7db90f4a LR |
1397 | if (last_request->initiator == |
1398 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1399 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1400 | /* |
1401 | * Two cards with two APs claiming different | |
1fe90b03 | 1402 | * Country IE alpha2s. We could |
84fa4f43 JB |
1403 | * intersect them, but that seems unlikely |
1404 | * to be correct. Reject second one for now. | |
1405 | */ | |
2f92cd2e | 1406 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1407 | return -EOPNOTSUPP; |
1408 | return -EALREADY; | |
1409 | } | |
fb1fc7ad LR |
1410 | /* |
1411 | * Two consecutive Country IE hints on the same wiphy. | |
1412 | * This should be picked up early by the driver/stack | |
1413 | */ | |
2f92cd2e | 1414 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1415 | return 0; |
1416 | return -EALREADY; | |
1417 | } | |
3f2355cb | 1418 | return REG_INTERSECT; |
7db90f4a LR |
1419 | case NL80211_REGDOM_SET_BY_DRIVER: |
1420 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
e74b1e7f LR |
1421 | if (is_old_static_regdom(cfg80211_regdomain)) |
1422 | return 0; | |
2f92cd2e | 1423 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1424 | return 0; |
84fa4f43 | 1425 | return -EALREADY; |
e74b1e7f | 1426 | } |
fff32c04 LR |
1427 | |
1428 | /* | |
1429 | * This would happen if you unplug and plug your card | |
1430 | * back in or if you add a new device for which the previously | |
1431 | * loaded card also agrees on the regulatory domain. | |
1432 | */ | |
7db90f4a | 1433 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1434 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1435 | return -EALREADY; |
1436 | ||
3e0c3ff3 | 1437 | return REG_INTERSECT; |
7db90f4a LR |
1438 | case NL80211_REGDOM_SET_BY_USER: |
1439 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1440 | return REG_INTERSECT; |
fb1fc7ad LR |
1441 | /* |
1442 | * If the user knows better the user should set the regdom | |
1443 | * to their country before the IE is picked up | |
1444 | */ | |
7db90f4a | 1445 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1446 | last_request->intersect) |
1447 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1448 | /* |
1449 | * Process user requests only after previous user/driver/core | |
1450 | * requests have been processed | |
1451 | */ | |
7db90f4a LR |
1452 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1453 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1454 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
69b1572b | 1455 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1456 | return -EAGAIN; |
1457 | } | |
1458 | ||
e74b1e7f | 1459 | if (!is_old_static_regdom(cfg80211_regdomain) && |
2f92cd2e | 1460 | !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]; | |
7db90f4a | 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 | ||
1878 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1879 | printk(KERN_DEBUG "cfg80211: Found new beacon on " | |
1880 | "frequency: %d MHz (Ch %d) on %s\n", | |
1881 | beacon_chan->center_freq, | |
1882 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
1883 | wiphy_name(wiphy)); | |
1884 | #endif | |
1885 | memcpy(®_beacon->chan, beacon_chan, | |
1886 | sizeof(struct ieee80211_channel)); | |
1887 | ||
1888 | ||
1889 | /* | |
1890 | * Since we can be called from BH or and non-BH context | |
1891 | * we must use spin_lock_bh() | |
1892 | */ | |
1893 | spin_lock_bh(®_pending_beacons_lock); | |
1894 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
1895 | spin_unlock_bh(®_pending_beacons_lock); | |
1896 | ||
1897 | schedule_work(®_work); | |
1898 | ||
1899 | return 0; | |
1900 | } | |
1901 | ||
a3d2eaf0 | 1902 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1903 | { |
1904 | unsigned int i; | |
a3d2eaf0 JB |
1905 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1906 | const struct ieee80211_freq_range *freq_range = NULL; | |
1907 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 | 1908 | |
269ac5fd | 1909 | printk(KERN_INFO " (start_freq - end_freq @ bandwidth), " |
b2e1b302 LR |
1910 | "(max_antenna_gain, max_eirp)\n"); |
1911 | ||
1912 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1913 | reg_rule = &rd->reg_rules[i]; | |
1914 | freq_range = ®_rule->freq_range; | |
1915 | power_rule = ®_rule->power_rule; | |
1916 | ||
fb1fc7ad LR |
1917 | /* |
1918 | * There may not be documentation for max antenna gain | |
1919 | * in certain regions | |
1920 | */ | |
b2e1b302 | 1921 | if (power_rule->max_antenna_gain) |
269ac5fd | 1922 | printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), " |
b2e1b302 LR |
1923 | "(%d mBi, %d mBm)\n", |
1924 | freq_range->start_freq_khz, | |
1925 | freq_range->end_freq_khz, | |
1926 | freq_range->max_bandwidth_khz, | |
1927 | power_rule->max_antenna_gain, | |
1928 | power_rule->max_eirp); | |
1929 | else | |
269ac5fd | 1930 | printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), " |
b2e1b302 LR |
1931 | "(N/A, %d mBm)\n", |
1932 | freq_range->start_freq_khz, | |
1933 | freq_range->end_freq_khz, | |
1934 | freq_range->max_bandwidth_khz, | |
1935 | power_rule->max_eirp); | |
1936 | } | |
1937 | } | |
1938 | ||
a3d2eaf0 | 1939 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1940 | { |
1941 | ||
3f2355cb | 1942 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 1943 | |
7db90f4a LR |
1944 | if (last_request->initiator == |
1945 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
79c97e97 JB |
1946 | struct cfg80211_registered_device *rdev; |
1947 | rdev = cfg80211_rdev_by_wiphy_idx( | |
806a9e39 | 1948 | last_request->wiphy_idx); |
79c97e97 | 1949 | if (rdev) { |
3f2355cb LR |
1950 | printk(KERN_INFO "cfg80211: Current regulatory " |
1951 | "domain updated by AP to: %c%c\n", | |
79c97e97 JB |
1952 | rdev->country_ie_alpha2[0], |
1953 | rdev->country_ie_alpha2[1]); | |
3f2355cb LR |
1954 | } else |
1955 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1956 | "domain intersected: \n"); | |
1957 | } else | |
1958 | printk(KERN_INFO "cfg80211: Current regulatory " | |
039498c6 | 1959 | "domain intersected: \n"); |
3f2355cb | 1960 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
1961 | printk(KERN_INFO "cfg80211: World regulatory " |
1962 | "domain updated:\n"); | |
1963 | else { | |
1964 | if (is_unknown_alpha2(rd->alpha2)) | |
1965 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1966 | "changed to driver built-in settings " | |
1967 | "(unknown country)\n"); | |
1968 | else | |
1969 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1970 | "changed to country: %c%c\n", | |
1971 | rd->alpha2[0], rd->alpha2[1]); | |
1972 | } | |
1973 | print_rd_rules(rd); | |
1974 | } | |
1975 | ||
2df78167 | 1976 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1977 | { |
1978 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1979 | rd->alpha2[0], rd->alpha2[1]); | |
1980 | print_rd_rules(rd); | |
1981 | } | |
1982 | ||
3f2355cb LR |
1983 | #ifdef CONFIG_CFG80211_REG_DEBUG |
1984 | static void reg_country_ie_process_debug( | |
1985 | const struct ieee80211_regdomain *rd, | |
1986 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1987 | const struct ieee80211_regdomain *intersected_rd) | |
1988 | { | |
1989 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
1990 | print_regdomain_info(country_ie_regdomain); | |
1991 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
1992 | print_regdomain_info(rd); | |
1993 | if (intersected_rd) { | |
1994 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
1995 | "and get:\n"); | |
667ecd01 | 1996 | print_regdomain_info(intersected_rd); |
3f2355cb LR |
1997 | return; |
1998 | } | |
1999 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
2000 | } | |
2001 | #else | |
2002 | static inline void reg_country_ie_process_debug( | |
2003 | const struct ieee80211_regdomain *rd, | |
2004 | const struct ieee80211_regdomain *country_ie_regdomain, | |
2005 | const struct ieee80211_regdomain *intersected_rd) | |
2006 | { | |
2007 | } | |
2008 | #endif | |
2009 | ||
d2372b31 | 2010 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 2011 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2012 | { |
9c96477d | 2013 | const struct ieee80211_regdomain *intersected_rd = NULL; |
79c97e97 | 2014 | struct cfg80211_registered_device *rdev = NULL; |
806a9e39 | 2015 | struct wiphy *request_wiphy; |
b2e1b302 LR |
2016 | /* Some basic sanity checks first */ |
2017 | ||
b2e1b302 | 2018 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 2019 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2020 | return -EINVAL; |
2021 | update_world_regdomain(rd); | |
2022 | return 0; | |
2023 | } | |
b2e1b302 LR |
2024 | |
2025 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
2026 | !is_unknown_alpha2(rd->alpha2)) | |
2027 | return -EINVAL; | |
2028 | ||
f6037d09 | 2029 | if (!last_request) |
b2e1b302 LR |
2030 | return -EINVAL; |
2031 | ||
fb1fc7ad LR |
2032 | /* |
2033 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 2034 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
2035 | * and the pending request came in from a country IE |
2036 | */ | |
7db90f4a | 2037 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
2038 | /* |
2039 | * If someone else asked us to change the rd lets only bother | |
2040 | * checking if the alpha2 changes if CRDA was already called | |
2041 | */ | |
3f2355cb | 2042 | if (!is_old_static_regdom(cfg80211_regdomain) && |
69b1572b | 2043 | !regdom_changes(rd->alpha2)) |
3f2355cb LR |
2044 | return -EINVAL; |
2045 | } | |
2046 | ||
fb1fc7ad LR |
2047 | /* |
2048 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
2049 | * and finally inform them of what we have done, in case they want |
2050 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
2051 | * internal EEPROM data |
2052 | */ | |
b2e1b302 | 2053 | |
f6037d09 | 2054 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2055 | return -EINVAL; |
2056 | ||
8375af3b LR |
2057 | if (!is_valid_rd(rd)) { |
2058 | printk(KERN_ERR "cfg80211: Invalid " | |
2059 | "regulatory domain detected:\n"); | |
2060 | print_regdomain_info(rd); | |
2061 | return -EINVAL; | |
b2e1b302 LR |
2062 | } |
2063 | ||
806a9e39 LR |
2064 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
2065 | ||
b8295acd | 2066 | if (!last_request->intersect) { |
3e0c3ff3 LR |
2067 | int r; |
2068 | ||
7db90f4a | 2069 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
3e0c3ff3 LR |
2070 | reset_regdomains(); |
2071 | cfg80211_regdomain = rd; | |
2072 | return 0; | |
2073 | } | |
2074 | ||
fb1fc7ad LR |
2075 | /* |
2076 | * For a driver hint, lets copy the regulatory domain the | |
2077 | * driver wanted to the wiphy to deal with conflicts | |
2078 | */ | |
3e0c3ff3 | 2079 | |
558f6d32 LR |
2080 | /* |
2081 | * Userspace could have sent two replies with only | |
2082 | * one kernel request. | |
2083 | */ | |
2084 | if (request_wiphy->regd) | |
2085 | return -EALREADY; | |
3e0c3ff3 | 2086 | |
806a9e39 | 2087 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
2088 | if (r) |
2089 | return r; | |
2090 | ||
b8295acd LR |
2091 | reset_regdomains(); |
2092 | cfg80211_regdomain = rd; | |
2093 | return 0; | |
2094 | } | |
2095 | ||
2096 | /* Intersection requires a bit more work */ | |
2097 | ||
7db90f4a | 2098 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 2099 | |
9c96477d LR |
2100 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
2101 | if (!intersected_rd) | |
2102 | return -EINVAL; | |
b8295acd | 2103 | |
fb1fc7ad LR |
2104 | /* |
2105 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 2106 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
2107 | * domain we keep it for its private use |
2108 | */ | |
7db90f4a | 2109 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 2110 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
2111 | else |
2112 | kfree(rd); | |
2113 | ||
b8295acd LR |
2114 | rd = NULL; |
2115 | ||
2116 | reset_regdomains(); | |
2117 | cfg80211_regdomain = intersected_rd; | |
2118 | ||
2119 | return 0; | |
9c96477d LR |
2120 | } |
2121 | ||
3f2355cb LR |
2122 | /* |
2123 | * Country IE requests are handled a bit differently, we intersect | |
2124 | * the country IE rd with what CRDA believes that country should have | |
2125 | */ | |
2126 | ||
729e9c76 LR |
2127 | /* |
2128 | * Userspace could have sent two replies with only | |
2129 | * one kernel request. By the second reply we would have | |
2130 | * already processed and consumed the country_ie_regdomain. | |
2131 | */ | |
2132 | if (!country_ie_regdomain) | |
2133 | return -EALREADY; | |
86f04680 | 2134 | BUG_ON(rd == country_ie_regdomain); |
3f2355cb | 2135 | |
86f04680 LR |
2136 | /* |
2137 | * Intersect what CRDA returned and our what we | |
2138 | * had built from the Country IE received | |
2139 | */ | |
3f2355cb | 2140 | |
86f04680 | 2141 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); |
3f2355cb | 2142 | |
86f04680 LR |
2143 | reg_country_ie_process_debug(rd, |
2144 | country_ie_regdomain, | |
2145 | intersected_rd); | |
3f2355cb | 2146 | |
86f04680 LR |
2147 | kfree(country_ie_regdomain); |
2148 | country_ie_regdomain = NULL; | |
3f2355cb LR |
2149 | |
2150 | if (!intersected_rd) | |
2151 | return -EINVAL; | |
2152 | ||
79c97e97 | 2153 | rdev = wiphy_to_dev(request_wiphy); |
3f2355cb | 2154 | |
79c97e97 JB |
2155 | rdev->country_ie_alpha2[0] = rd->alpha2[0]; |
2156 | rdev->country_ie_alpha2[1] = rd->alpha2[1]; | |
2157 | rdev->env = last_request->country_ie_env; | |
3f2355cb LR |
2158 | |
2159 | BUG_ON(intersected_rd == rd); | |
2160 | ||
2161 | kfree(rd); | |
2162 | rd = NULL; | |
2163 | ||
b8295acd | 2164 | reset_regdomains(); |
3f2355cb | 2165 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2166 | |
2167 | return 0; | |
2168 | } | |
2169 | ||
2170 | ||
fb1fc7ad LR |
2171 | /* |
2172 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2173 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2174 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2175 | */ | |
a3d2eaf0 | 2176 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2177 | { |
b2e1b302 LR |
2178 | int r; |
2179 | ||
761cf7ec LR |
2180 | assert_cfg80211_lock(); |
2181 | ||
abc7381b LR |
2182 | mutex_lock(®_mutex); |
2183 | ||
b2e1b302 LR |
2184 | /* Note that this doesn't update the wiphys, this is done below */ |
2185 | r = __set_regdom(rd); | |
d2372b31 JB |
2186 | if (r) { |
2187 | kfree(rd); | |
abc7381b | 2188 | mutex_unlock(®_mutex); |
b2e1b302 | 2189 | return r; |
d2372b31 | 2190 | } |
b2e1b302 | 2191 | |
b2e1b302 | 2192 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2193 | if (!last_request->intersect) |
2194 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2195 | |
2196 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2197 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2198 | |
a01ddafd | 2199 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2200 | |
73d54c9e LR |
2201 | nl80211_send_reg_change_event(last_request); |
2202 | ||
abc7381b LR |
2203 | mutex_unlock(®_mutex); |
2204 | ||
b2e1b302 LR |
2205 | return r; |
2206 | } | |
2207 | ||
a1794390 | 2208 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2209 | void reg_device_remove(struct wiphy *wiphy) |
2210 | { | |
0ad8acaf | 2211 | struct wiphy *request_wiphy = NULL; |
806a9e39 | 2212 | |
761cf7ec LR |
2213 | assert_cfg80211_lock(); |
2214 | ||
abc7381b LR |
2215 | mutex_lock(®_mutex); |
2216 | ||
0ef9ccdd CW |
2217 | kfree(wiphy->regd); |
2218 | ||
0ad8acaf LR |
2219 | if (last_request) |
2220 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
806a9e39 | 2221 | |
0ef9ccdd | 2222 | if (!request_wiphy || request_wiphy != wiphy) |
abc7381b | 2223 | goto out; |
0ef9ccdd | 2224 | |
806a9e39 | 2225 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb | 2226 | last_request->country_ie_env = ENVIRON_ANY; |
abc7381b LR |
2227 | out: |
2228 | mutex_unlock(®_mutex); | |
3f2355cb LR |
2229 | } |
2230 | ||
b2e1b302 LR |
2231 | int regulatory_init(void) |
2232 | { | |
bcf4f99b | 2233 | int err = 0; |
734366de | 2234 | |
b2e1b302 LR |
2235 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2236 | if (IS_ERR(reg_pdev)) | |
2237 | return PTR_ERR(reg_pdev); | |
734366de | 2238 | |
fe33eb39 | 2239 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2240 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2241 | |
734366de | 2242 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY |
a3d2eaf0 | 2243 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 2244 | |
942b25cf | 2245 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de | 2246 | print_regdomain_info(cfg80211_regdomain); |
734366de | 2247 | #else |
a3d2eaf0 | 2248 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2249 | |
bcf4f99b | 2250 | #endif |
ae9e4b0d LR |
2251 | /* We always try to get an update for the static regdomain */ |
2252 | err = regulatory_hint_core(cfg80211_regdomain->alpha2); | |
ba25c141 | 2253 | if (err) { |
bcf4f99b LR |
2254 | if (err == -ENOMEM) |
2255 | return err; | |
2256 | /* | |
2257 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2258 | * memory which is handled and propagated appropriately above | |
2259 | * but it can also fail during a netlink_broadcast() or during | |
2260 | * early boot for call_usermodehelper(). For now treat these | |
2261 | * errors as non-fatal. | |
2262 | */ | |
2263 | printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " | |
2264 | "to call CRDA during init"); | |
2265 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
2266 | /* We want to find out exactly why when debugging */ | |
2267 | WARN_ON(err); | |
734366de | 2268 | #endif |
bcf4f99b | 2269 | } |
734366de | 2270 | |
ae9e4b0d LR |
2271 | /* |
2272 | * Finally, if the user set the module parameter treat it | |
2273 | * as a user hint. | |
2274 | */ | |
2275 | if (!is_world_regdom(ieee80211_regdom)) | |
2276 | regulatory_hint_user(ieee80211_regdom); | |
2277 | ||
b2e1b302 LR |
2278 | return 0; |
2279 | } | |
2280 | ||
2281 | void regulatory_exit(void) | |
2282 | { | |
fe33eb39 | 2283 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2284 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2285 | |
2286 | cancel_work_sync(®_work); | |
2287 | ||
a1794390 | 2288 | mutex_lock(&cfg80211_mutex); |
abc7381b | 2289 | mutex_lock(®_mutex); |
734366de | 2290 | |
b2e1b302 | 2291 | reset_regdomains(); |
734366de | 2292 | |
3f2355cb LR |
2293 | kfree(country_ie_regdomain); |
2294 | country_ie_regdomain = NULL; | |
2295 | ||
f6037d09 JB |
2296 | kfree(last_request); |
2297 | ||
b2e1b302 | 2298 | platform_device_unregister(reg_pdev); |
734366de | 2299 | |
e38f8a7a LR |
2300 | spin_lock_bh(®_pending_beacons_lock); |
2301 | if (!list_empty(®_pending_beacons)) { | |
2302 | list_for_each_entry_safe(reg_beacon, btmp, | |
2303 | ®_pending_beacons, list) { | |
2304 | list_del(®_beacon->list); | |
2305 | kfree(reg_beacon); | |
2306 | } | |
2307 | } | |
2308 | spin_unlock_bh(®_pending_beacons_lock); | |
2309 | ||
2310 | if (!list_empty(®_beacon_list)) { | |
2311 | list_for_each_entry_safe(reg_beacon, btmp, | |
2312 | ®_beacon_list, list) { | |
2313 | list_del(®_beacon->list); | |
2314 | kfree(reg_beacon); | |
2315 | } | |
2316 | } | |
2317 | ||
fe33eb39 LR |
2318 | spin_lock(®_requests_lock); |
2319 | if (!list_empty(®_requests_list)) { | |
2320 | list_for_each_entry_safe(reg_request, tmp, | |
2321 | ®_requests_list, list) { | |
2322 | list_del(®_request->list); | |
2323 | kfree(reg_request); | |
2324 | } | |
2325 | } | |
2326 | spin_unlock(®_requests_lock); | |
2327 | ||
abc7381b | 2328 | mutex_unlock(®_mutex); |
a1794390 | 2329 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2330 | } |