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Commit | Line | Data |
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8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
b2e1b302 | 5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
8318d78a JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
b2e1b302 LR |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
14 | * |
15 | * The usual implementation is for a driver to read a device EEPROM to | |
16 | * determine which regulatory domain it should be operating under, then | |
17 | * looking up the allowable channels in a driver-local table and finally | |
18 | * registering those channels in the wiphy structure. | |
19 | * | |
b2e1b302 LR |
20 | * Another set of compliance enforcement is for drivers to use their |
21 | * own compliance limits which can be stored on the EEPROM. The host | |
22 | * driver or firmware may ensure these are used. | |
23 | * | |
24 | * In addition to all this we provide an extra layer of regulatory | |
25 | * conformance. For drivers which do not have any regulatory | |
26 | * information CRDA provides the complete regulatory solution. | |
27 | * For others it provides a community effort on further restrictions | |
28 | * to enhance compliance. | |
29 | * | |
30 | * Note: When number of rules --> infinity we will not be able to | |
31 | * index on alpha2 any more, instead we'll probably have to | |
32 | * rely on some SHA1 checksum of the regdomain for example. | |
33 | * | |
8318d78a 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> | |
8318d78a | 40 | #include <net/wireless.h> |
b2e1b302 | 41 | #include <net/cfg80211.h> |
8318d78a | 42 | #include "core.h" |
b2e1b302 | 43 | #include "reg.h" |
73d54c9e | 44 | #include "nl80211.h" |
8318d78a | 45 | |
5166ccd2 | 46 | /* Receipt of information from last regulatory request */ |
f6037d09 | 47 | static struct regulatory_request *last_request; |
734366de | 48 | |
b2e1b302 LR |
49 | /* To trigger userspace events */ |
50 | static struct platform_device *reg_pdev; | |
8318d78a | 51 | |
b2e1b302 LR |
52 | /* Keep the ordering from large to small */ |
53 | static u32 supported_bandwidths[] = { | |
54 | MHZ_TO_KHZ(40), | |
55 | MHZ_TO_KHZ(20), | |
8318d78a JB |
56 | }; |
57 | ||
fb1fc7ad LR |
58 | /* |
59 | * Central wireless core regulatory domains, we only need two, | |
734366de | 60 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
61 | * information to give us an alpha2 |
62 | */ | |
f130347c | 63 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 64 | |
fb1fc7ad LR |
65 | /* |
66 | * We use this as a place for the rd structure built from the | |
3f2355cb | 67 | * last parsed country IE to rest until CRDA gets back to us with |
fb1fc7ad LR |
68 | * what it thinks should apply for the same country |
69 | */ | |
3f2355cb LR |
70 | static const struct ieee80211_regdomain *country_ie_regdomain; |
71 | ||
e38f8a7a | 72 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
73 | static LIST_HEAD(reg_requests_list); |
74 | static spinlock_t reg_requests_lock; | |
75 | ||
e38f8a7a LR |
76 | /* Used to queue up beacon hints for review */ |
77 | static LIST_HEAD(reg_pending_beacons); | |
78 | static spinlock_t reg_pending_beacons_lock; | |
79 | ||
80 | /* Used to keep track of processed beacon hints */ | |
81 | static LIST_HEAD(reg_beacon_list); | |
82 | ||
83 | struct reg_beacon { | |
84 | struct list_head list; | |
85 | struct ieee80211_channel chan; | |
86 | }; | |
87 | ||
734366de JB |
88 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
89 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 90 | .n_reg_rules = 5, |
734366de JB |
91 | .alpha2 = "00", |
92 | .reg_rules = { | |
68798a62 LR |
93 | /* IEEE 802.11b/g, channels 1..11 */ |
94 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
95 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
96 | * channel fits here. */ | |
97 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
98 | NL80211_RRF_PASSIVE_SCAN | |
99 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
100 | /* IEEE 802.11 channel 14 - Only JP enables |
101 | * this and for 802.11b only */ | |
102 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
103 | NL80211_RRF_PASSIVE_SCAN | | |
104 | NL80211_RRF_NO_IBSS | | |
105 | NL80211_RRF_NO_OFDM), | |
106 | /* IEEE 802.11a, channel 36..48 */ | |
ec329ace | 107 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
108 | NL80211_RRF_PASSIVE_SCAN | |
109 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
110 | |
111 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
112 | ||
113 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 114 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
115 | NL80211_RRF_PASSIVE_SCAN | |
116 | NL80211_RRF_NO_IBSS), | |
734366de JB |
117 | } |
118 | }; | |
119 | ||
a3d2eaf0 JB |
120 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
121 | &world_regdom; | |
734366de JB |
122 | |
123 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
124 | static char *ieee80211_regdom = "US"; | |
6ee7d330 LR |
125 | #else |
126 | static char *ieee80211_regdom = "00"; | |
127 | #endif | |
128 | ||
734366de JB |
129 | module_param(ieee80211_regdom, charp, 0444); |
130 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
131 | ||
6ee7d330 | 132 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY |
fb1fc7ad LR |
133 | /* |
134 | * We assume 40 MHz bandwidth for the old regulatory work. | |
734366de | 135 | * We make emphasis we are using the exact same frequencies |
fb1fc7ad LR |
136 | * as before |
137 | */ | |
734366de JB |
138 | |
139 | static const struct ieee80211_regdomain us_regdom = { | |
140 | .n_reg_rules = 6, | |
141 | .alpha2 = "US", | |
142 | .reg_rules = { | |
143 | /* IEEE 802.11b/g, channels 1..11 */ | |
144 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
145 | /* IEEE 802.11a, channel 36 */ | |
146 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
147 | /* IEEE 802.11a, channel 40 */ | |
148 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
149 | /* IEEE 802.11a, channel 44 */ | |
150 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
151 | /* IEEE 802.11a, channels 48..64 */ | |
152 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
153 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
154 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
155 | } | |
156 | }; | |
157 | ||
158 | static const struct ieee80211_regdomain jp_regdom = { | |
159 | .n_reg_rules = 3, | |
160 | .alpha2 = "JP", | |
161 | .reg_rules = { | |
162 | /* IEEE 802.11b/g, channels 1..14 */ | |
163 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
164 | /* IEEE 802.11a, channels 34..48 */ | |
165 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
166 | NL80211_RRF_PASSIVE_SCAN), | |
167 | /* IEEE 802.11a, channels 52..64 */ | |
168 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
169 | NL80211_RRF_NO_IBSS | | |
170 | NL80211_RRF_DFS), | |
171 | } | |
172 | }; | |
173 | ||
174 | static const struct ieee80211_regdomain eu_regdom = { | |
175 | .n_reg_rules = 6, | |
fb1fc7ad LR |
176 | /* |
177 | * This alpha2 is bogus, we leave it here just for stupid | |
178 | * backward compatibility | |
179 | */ | |
734366de JB |
180 | .alpha2 = "EU", |
181 | .reg_rules = { | |
182 | /* IEEE 802.11b/g, channels 1..13 */ | |
183 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
184 | /* IEEE 802.11a, channel 36 */ | |
185 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
186 | NL80211_RRF_PASSIVE_SCAN), | |
187 | /* IEEE 802.11a, channel 40 */ | |
188 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
189 | NL80211_RRF_PASSIVE_SCAN), | |
190 | /* IEEE 802.11a, channel 44 */ | |
191 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
192 | NL80211_RRF_PASSIVE_SCAN), | |
193 | /* IEEE 802.11a, channels 48..64 */ | |
194 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
195 | NL80211_RRF_NO_IBSS | | |
196 | NL80211_RRF_DFS), | |
197 | /* IEEE 802.11a, channels 100..140 */ | |
198 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
199 | NL80211_RRF_NO_IBSS | | |
200 | NL80211_RRF_DFS), | |
201 | } | |
202 | }; | |
203 | ||
204 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
205 | { | |
206 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
207 | return &us_regdom; | |
208 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
209 | return &jp_regdom; | |
210 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
211 | return &eu_regdom; | |
212 | /* Default, as per the old rules */ | |
213 | return &us_regdom; | |
214 | } | |
215 | ||
a3d2eaf0 | 216 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
217 | { |
218 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
219 | return true; | |
220 | return false; | |
221 | } | |
942b25cf JB |
222 | #else |
223 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 224 | { |
942b25cf | 225 | return false; |
734366de | 226 | } |
942b25cf JB |
227 | #endif |
228 | ||
734366de JB |
229 | static void reset_regdomains(void) |
230 | { | |
942b25cf JB |
231 | /* avoid freeing static information or freeing something twice */ |
232 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
233 | cfg80211_regdomain = NULL; | |
234 | if (cfg80211_world_regdom == &world_regdom) | |
235 | cfg80211_world_regdom = NULL; | |
236 | if (cfg80211_regdomain == &world_regdom) | |
237 | cfg80211_regdomain = NULL; | |
238 | if (is_old_static_regdom(cfg80211_regdomain)) | |
239 | cfg80211_regdomain = NULL; | |
240 | ||
241 | kfree(cfg80211_regdomain); | |
242 | kfree(cfg80211_world_regdom); | |
734366de | 243 | |
a3d2eaf0 | 244 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
245 | cfg80211_regdomain = NULL; |
246 | } | |
247 | ||
fb1fc7ad LR |
248 | /* |
249 | * Dynamic world regulatory domain requested by the wireless | |
250 | * core upon initialization | |
251 | */ | |
a3d2eaf0 | 252 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 253 | { |
f6037d09 | 254 | BUG_ON(!last_request); |
734366de JB |
255 | |
256 | reset_regdomains(); | |
257 | ||
258 | cfg80211_world_regdom = rd; | |
259 | cfg80211_regdomain = rd; | |
260 | } | |
734366de | 261 | |
a3d2eaf0 | 262 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
263 | { |
264 | if (!alpha2) | |
265 | return false; | |
266 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
267 | return true; | |
268 | return false; | |
269 | } | |
8318d78a | 270 | |
a3d2eaf0 | 271 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
272 | { |
273 | if (!alpha2) | |
274 | return false; | |
275 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
276 | return true; | |
277 | return false; | |
278 | } | |
8318d78a | 279 | |
b2e1b302 LR |
280 | static bool is_alpha_upper(char letter) |
281 | { | |
282 | /* ASCII A - Z */ | |
283 | if (letter >= 65 && letter <= 90) | |
284 | return true; | |
285 | return false; | |
286 | } | |
8318d78a | 287 | |
a3d2eaf0 | 288 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
289 | { |
290 | if (!alpha2) | |
291 | return false; | |
fb1fc7ad LR |
292 | /* |
293 | * Special case where regulatory domain was built by driver | |
294 | * but a specific alpha2 cannot be determined | |
295 | */ | |
b2e1b302 LR |
296 | if (alpha2[0] == '9' && alpha2[1] == '9') |
297 | return true; | |
298 | return false; | |
299 | } | |
8318d78a | 300 | |
3f2355cb LR |
301 | static bool is_intersected_alpha2(const char *alpha2) |
302 | { | |
303 | if (!alpha2) | |
304 | return false; | |
fb1fc7ad LR |
305 | /* |
306 | * Special case where regulatory domain is the | |
3f2355cb | 307 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
308 | * structures |
309 | */ | |
3f2355cb LR |
310 | if (alpha2[0] == '9' && alpha2[1] == '8') |
311 | return true; | |
312 | return false; | |
313 | } | |
314 | ||
a3d2eaf0 | 315 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
316 | { |
317 | if (!alpha2) | |
318 | return false; | |
319 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
320 | return true; | |
321 | return false; | |
322 | } | |
8318d78a | 323 | |
a3d2eaf0 | 324 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
325 | { |
326 | if (!alpha2_x || !alpha2_y) | |
327 | return false; | |
328 | if (alpha2_x[0] == alpha2_y[0] && | |
329 | alpha2_x[1] == alpha2_y[1]) | |
330 | return true; | |
331 | return false; | |
332 | } | |
333 | ||
69b1572b | 334 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 335 | { |
761cf7ec LR |
336 | assert_cfg80211_lock(); |
337 | ||
b2e1b302 LR |
338 | if (!cfg80211_regdomain) |
339 | return true; | |
340 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
341 | return false; | |
342 | return true; | |
343 | } | |
344 | ||
3f2355cb LR |
345 | /** |
346 | * country_ie_integrity_changes - tells us if the country IE has changed | |
347 | * @checksum: checksum of country IE of fields we are interested in | |
348 | * | |
349 | * If the country IE has not changed you can ignore it safely. This is | |
350 | * useful to determine if two devices are seeing two different country IEs | |
351 | * even on the same alpha2. Note that this will return false if no IE has | |
352 | * been set on the wireless core yet. | |
353 | */ | |
354 | static bool country_ie_integrity_changes(u32 checksum) | |
355 | { | |
356 | /* If no IE has been set then the checksum doesn't change */ | |
357 | if (unlikely(!last_request->country_ie_checksum)) | |
358 | return false; | |
359 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
360 | return true; | |
361 | return false; | |
362 | } | |
363 | ||
fb1fc7ad LR |
364 | /* |
365 | * This lets us keep regulatory code which is updated on a regulatory | |
366 | * basis in userspace. | |
367 | */ | |
b2e1b302 LR |
368 | static int call_crda(const char *alpha2) |
369 | { | |
370 | char country_env[9 + 2] = "COUNTRY="; | |
371 | char *envp[] = { | |
372 | country_env, | |
373 | NULL | |
374 | }; | |
375 | ||
376 | if (!is_world_regdom((char *) alpha2)) | |
377 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
378 | alpha2[0], alpha2[1]); | |
379 | else | |
b2e1b302 LR |
380 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
381 | "regulatory domain\n"); | |
b2e1b302 LR |
382 | |
383 | country_env[8] = alpha2[0]; | |
384 | country_env[9] = alpha2[1]; | |
385 | ||
386 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
387 | } | |
388 | ||
b2e1b302 | 389 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 390 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 391 | { |
f6037d09 JB |
392 | if (!last_request) |
393 | return false; | |
394 | ||
395 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 396 | } |
8318d78a | 397 | |
b2e1b302 | 398 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 399 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 400 | { |
a3d2eaf0 | 401 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
402 | u32 freq_diff; |
403 | ||
91e99004 | 404 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
405 | return false; |
406 | ||
407 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
408 | return false; | |
409 | ||
410 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
411 | ||
bd05f28e RK |
412 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
413 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
414 | return false; |
415 | ||
416 | return true; | |
417 | } | |
418 | ||
a3d2eaf0 | 419 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 420 | { |
a3d2eaf0 | 421 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 422 | unsigned int i; |
8318d78a | 423 | |
b2e1b302 LR |
424 | if (!rd->n_reg_rules) |
425 | return false; | |
8318d78a | 426 | |
88dc1c3f LR |
427 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
428 | return false; | |
429 | ||
b2e1b302 LR |
430 | for (i = 0; i < rd->n_reg_rules; i++) { |
431 | reg_rule = &rd->reg_rules[i]; | |
432 | if (!is_valid_reg_rule(reg_rule)) | |
433 | return false; | |
434 | } | |
435 | ||
436 | return true; | |
8318d78a JB |
437 | } |
438 | ||
b2e1b302 LR |
439 | /* Returns value in KHz */ |
440 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
441 | u32 freq) | |
442 | { | |
443 | unsigned int i; | |
444 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
445 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
446 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
447 | if (start_freq_khz >= freq_range->start_freq_khz && | |
448 | end_freq_khz <= freq_range->end_freq_khz) | |
449 | return supported_bandwidths[i]; | |
450 | } | |
451 | return 0; | |
452 | } | |
8318d78a | 453 | |
0c7dc45d LR |
454 | /** |
455 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
456 | * @freq_range: frequency rule we want to query | |
457 | * @freq_khz: frequency we are inquiring about | |
458 | * | |
459 | * This lets us know if a specific frequency rule is or is not relevant to | |
460 | * a specific frequency's band. Bands are device specific and artificial | |
461 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
462 | * safe for now to assume that a frequency rule should not be part of a | |
463 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
464 | * This resolution can be lowered and should be considered as we add | |
465 | * regulatory rule support for other "bands". | |
466 | **/ | |
467 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
468 | u32 freq_khz) | |
469 | { | |
470 | #define ONE_GHZ_IN_KHZ 1000000 | |
471 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
472 | return true; | |
473 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
474 | return true; | |
475 | return false; | |
476 | #undef ONE_GHZ_IN_KHZ | |
477 | } | |
478 | ||
fb1fc7ad LR |
479 | /* |
480 | * Converts a country IE to a regulatory domain. A regulatory domain | |
3f2355cb LR |
481 | * structure has a lot of information which the IE doesn't yet have, |
482 | * so for the other values we use upper max values as we will intersect | |
fb1fc7ad LR |
483 | * with our userspace regulatory agent to get lower bounds. |
484 | */ | |
3f2355cb LR |
485 | static struct ieee80211_regdomain *country_ie_2_rd( |
486 | u8 *country_ie, | |
487 | u8 country_ie_len, | |
488 | u32 *checksum) | |
489 | { | |
490 | struct ieee80211_regdomain *rd = NULL; | |
491 | unsigned int i = 0; | |
492 | char alpha2[2]; | |
493 | u32 flags = 0; | |
494 | u32 num_rules = 0, size_of_regd = 0; | |
495 | u8 *triplets_start = NULL; | |
496 | u8 len_at_triplet = 0; | |
497 | /* the last channel we have registered in a subband (triplet) */ | |
498 | int last_sub_max_channel = 0; | |
499 | ||
500 | *checksum = 0xDEADBEEF; | |
501 | ||
502 | /* Country IE requirements */ | |
503 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
504 | country_ie_len & 0x01); | |
505 | ||
506 | alpha2[0] = country_ie[0]; | |
507 | alpha2[1] = country_ie[1]; | |
508 | ||
509 | /* | |
510 | * Third octet can be: | |
511 | * 'I' - Indoor | |
512 | * 'O' - Outdoor | |
513 | * | |
514 | * anything else we assume is no restrictions | |
515 | */ | |
516 | if (country_ie[2] == 'I') | |
517 | flags = NL80211_RRF_NO_OUTDOOR; | |
518 | else if (country_ie[2] == 'O') | |
519 | flags = NL80211_RRF_NO_INDOOR; | |
520 | ||
521 | country_ie += 3; | |
522 | country_ie_len -= 3; | |
523 | ||
524 | triplets_start = country_ie; | |
525 | len_at_triplet = country_ie_len; | |
526 | ||
527 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
528 | ||
fb1fc7ad LR |
529 | /* |
530 | * We need to build a reg rule for each triplet, but first we must | |
3f2355cb | 531 | * calculate the number of reg rules we will need. We will need one |
fb1fc7ad LR |
532 | * for each channel subband |
533 | */ | |
3f2355cb | 534 | while (country_ie_len >= 3) { |
615aab4b | 535 | int end_channel = 0; |
3f2355cb LR |
536 | struct ieee80211_country_ie_triplet *triplet = |
537 | (struct ieee80211_country_ie_triplet *) country_ie; | |
538 | int cur_sub_max_channel = 0, cur_channel = 0; | |
539 | ||
540 | if (triplet->ext.reg_extension_id >= | |
541 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
542 | country_ie += 3; | |
543 | country_ie_len -= 3; | |
544 | continue; | |
545 | } | |
546 | ||
615aab4b LR |
547 | /* 2 GHz */ |
548 | if (triplet->chans.first_channel <= 14) | |
549 | end_channel = triplet->chans.first_channel + | |
550 | triplet->chans.num_channels; | |
551 | else | |
552 | /* | |
553 | * 5 GHz -- For example in country IEs if the first | |
554 | * channel given is 36 and the number of channels is 4 | |
555 | * then the individual channel numbers defined for the | |
556 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
557 | * and not 36, 37, 38, 39. | |
558 | * | |
559 | * See: http://tinyurl.com/11d-clarification | |
560 | */ | |
561 | end_channel = triplet->chans.first_channel + | |
562 | (4 * (triplet->chans.num_channels - 1)); | |
563 | ||
3f2355cb | 564 | cur_channel = triplet->chans.first_channel; |
615aab4b | 565 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
566 | |
567 | /* Basic sanity check */ | |
568 | if (cur_sub_max_channel < cur_channel) | |
569 | return NULL; | |
570 | ||
fb1fc7ad LR |
571 | /* |
572 | * Do not allow overlapping channels. Also channels | |
3f2355cb | 573 | * passed in each subband must be monotonically |
fb1fc7ad LR |
574 | * increasing |
575 | */ | |
3f2355cb LR |
576 | if (last_sub_max_channel) { |
577 | if (cur_channel <= last_sub_max_channel) | |
578 | return NULL; | |
579 | if (cur_sub_max_channel <= last_sub_max_channel) | |
580 | return NULL; | |
581 | } | |
582 | ||
fb1fc7ad LR |
583 | /* |
584 | * When dot11RegulatoryClassesRequired is supported | |
3f2355cb LR |
585 | * we can throw ext triplets as part of this soup, |
586 | * for now we don't care when those change as we | |
fb1fc7ad LR |
587 | * don't support them |
588 | */ | |
3f2355cb LR |
589 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | |
590 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
591 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
592 | ||
593 | last_sub_max_channel = cur_sub_max_channel; | |
594 | ||
595 | country_ie += 3; | |
596 | country_ie_len -= 3; | |
597 | num_rules++; | |
598 | ||
fb1fc7ad LR |
599 | /* |
600 | * Note: this is not a IEEE requirement but | |
601 | * simply a memory requirement | |
602 | */ | |
3f2355cb LR |
603 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) |
604 | return NULL; | |
605 | } | |
606 | ||
607 | country_ie = triplets_start; | |
608 | country_ie_len = len_at_triplet; | |
609 | ||
610 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
611 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
612 | ||
613 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
614 | if (!rd) | |
615 | return NULL; | |
616 | ||
617 | rd->n_reg_rules = num_rules; | |
618 | rd->alpha2[0] = alpha2[0]; | |
619 | rd->alpha2[1] = alpha2[1]; | |
620 | ||
621 | /* This time around we fill in the rd */ | |
622 | while (country_ie_len >= 3) { | |
02e68a3d | 623 | int end_channel = 0; |
3f2355cb LR |
624 | struct ieee80211_country_ie_triplet *triplet = |
625 | (struct ieee80211_country_ie_triplet *) country_ie; | |
626 | struct ieee80211_reg_rule *reg_rule = NULL; | |
627 | struct ieee80211_freq_range *freq_range = NULL; | |
628 | struct ieee80211_power_rule *power_rule = NULL; | |
629 | ||
fb1fc7ad LR |
630 | /* |
631 | * Must parse if dot11RegulatoryClassesRequired is true, | |
632 | * we don't support this yet | |
633 | */ | |
3f2355cb LR |
634 | if (triplet->ext.reg_extension_id >= |
635 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
636 | country_ie += 3; | |
637 | country_ie_len -= 3; | |
638 | continue; | |
639 | } | |
640 | ||
641 | reg_rule = &rd->reg_rules[i]; | |
642 | freq_range = ®_rule->freq_range; | |
643 | power_rule = ®_rule->power_rule; | |
644 | ||
645 | reg_rule->flags = flags; | |
646 | ||
02e68a3d LR |
647 | /* 2 GHz */ |
648 | if (triplet->chans.first_channel <= 14) | |
649 | end_channel = triplet->chans.first_channel + | |
650 | triplet->chans.num_channels; | |
651 | else | |
02e68a3d LR |
652 | end_channel = triplet->chans.first_channel + |
653 | (4 * (triplet->chans.num_channels - 1)); | |
654 | ||
fb1fc7ad LR |
655 | /* |
656 | * The +10 is since the regulatory domain expects | |
3f2355cb LR |
657 | * the actual band edge, not the center of freq for |
658 | * its start and end freqs, assuming 20 MHz bandwidth on | |
fb1fc7ad LR |
659 | * the channels passed |
660 | */ | |
3f2355cb LR |
661 | freq_range->start_freq_khz = |
662 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
663 | triplet->chans.first_channel) - 10); | |
664 | freq_range->end_freq_khz = | |
665 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 666 | end_channel) + 10); |
3f2355cb | 667 | |
fb1fc7ad LR |
668 | /* |
669 | * These are large arbitrary values we use to intersect later. | |
670 | * Increment this if we ever support >= 40 MHz channels | |
671 | * in IEEE 802.11 | |
672 | */ | |
3f2355cb LR |
673 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); |
674 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
675 | power_rule->max_eirp = DBM_TO_MBM(100); | |
676 | ||
677 | country_ie += 3; | |
678 | country_ie_len -= 3; | |
679 | i++; | |
680 | ||
681 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
682 | } | |
683 | ||
684 | return rd; | |
685 | } | |
686 | ||
687 | ||
fb1fc7ad LR |
688 | /* |
689 | * Helper for regdom_intersect(), this does the real | |
690 | * mathematical intersection fun | |
691 | */ | |
9c96477d LR |
692 | static int reg_rules_intersect( |
693 | const struct ieee80211_reg_rule *rule1, | |
694 | const struct ieee80211_reg_rule *rule2, | |
695 | struct ieee80211_reg_rule *intersected_rule) | |
696 | { | |
697 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
698 | struct ieee80211_freq_range *freq_range; | |
699 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
700 | struct ieee80211_power_rule *power_rule; | |
701 | u32 freq_diff; | |
702 | ||
703 | freq_range1 = &rule1->freq_range; | |
704 | freq_range2 = &rule2->freq_range; | |
705 | freq_range = &intersected_rule->freq_range; | |
706 | ||
707 | power_rule1 = &rule1->power_rule; | |
708 | power_rule2 = &rule2->power_rule; | |
709 | power_rule = &intersected_rule->power_rule; | |
710 | ||
711 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
712 | freq_range2->start_freq_khz); | |
713 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
714 | freq_range2->end_freq_khz); | |
715 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
716 | freq_range2->max_bandwidth_khz); | |
717 | ||
718 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
719 | if (freq_range->max_bandwidth_khz > freq_diff) | |
720 | freq_range->max_bandwidth_khz = freq_diff; | |
721 | ||
722 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
723 | power_rule2->max_eirp); | |
724 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
725 | power_rule2->max_antenna_gain); | |
726 | ||
727 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
728 | ||
729 | if (!is_valid_reg_rule(intersected_rule)) | |
730 | return -EINVAL; | |
731 | ||
732 | return 0; | |
733 | } | |
734 | ||
735 | /** | |
736 | * regdom_intersect - do the intersection between two regulatory domains | |
737 | * @rd1: first regulatory domain | |
738 | * @rd2: second regulatory domain | |
739 | * | |
740 | * Use this function to get the intersection between two regulatory domains. | |
741 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
742 | * as no one single alpha2 can represent this regulatory domain. | |
743 | * | |
744 | * Returns a pointer to the regulatory domain structure which will hold the | |
745 | * resulting intersection of rules between rd1 and rd2. We will | |
746 | * kzalloc() this structure for you. | |
747 | */ | |
748 | static struct ieee80211_regdomain *regdom_intersect( | |
749 | const struct ieee80211_regdomain *rd1, | |
750 | const struct ieee80211_regdomain *rd2) | |
751 | { | |
752 | int r, size_of_regd; | |
753 | unsigned int x, y; | |
754 | unsigned int num_rules = 0, rule_idx = 0; | |
755 | const struct ieee80211_reg_rule *rule1, *rule2; | |
756 | struct ieee80211_reg_rule *intersected_rule; | |
757 | struct ieee80211_regdomain *rd; | |
758 | /* This is just a dummy holder to help us count */ | |
759 | struct ieee80211_reg_rule irule; | |
760 | ||
761 | /* Uses the stack temporarily for counter arithmetic */ | |
762 | intersected_rule = &irule; | |
763 | ||
764 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
765 | ||
766 | if (!rd1 || !rd2) | |
767 | return NULL; | |
768 | ||
fb1fc7ad LR |
769 | /* |
770 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
771 | * build them. This is to so we can malloc() and free() a |
772 | * regdomain once. The reason we use reg_rules_intersect() here | |
773 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
774 | * All rules that do check out OK are valid. |
775 | */ | |
9c96477d LR |
776 | |
777 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
778 | rule1 = &rd1->reg_rules[x]; | |
779 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
780 | rule2 = &rd2->reg_rules[y]; | |
781 | if (!reg_rules_intersect(rule1, rule2, | |
782 | intersected_rule)) | |
783 | num_rules++; | |
784 | memset(intersected_rule, 0, | |
785 | sizeof(struct ieee80211_reg_rule)); | |
786 | } | |
787 | } | |
788 | ||
789 | if (!num_rules) | |
790 | return NULL; | |
791 | ||
792 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
793 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
794 | ||
795 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
796 | if (!rd) | |
797 | return NULL; | |
798 | ||
799 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
800 | rule1 = &rd1->reg_rules[x]; | |
801 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
802 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
803 | /* |
804 | * This time around instead of using the stack lets | |
9c96477d | 805 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
806 | * a memcpy() |
807 | */ | |
9c96477d LR |
808 | intersected_rule = &rd->reg_rules[rule_idx]; |
809 | r = reg_rules_intersect(rule1, rule2, | |
810 | intersected_rule); | |
fb1fc7ad LR |
811 | /* |
812 | * No need to memset here the intersected rule here as | |
813 | * we're not using the stack anymore | |
814 | */ | |
9c96477d LR |
815 | if (r) |
816 | continue; | |
817 | rule_idx++; | |
818 | } | |
819 | } | |
820 | ||
821 | if (rule_idx != num_rules) { | |
822 | kfree(rd); | |
823 | return NULL; | |
824 | } | |
825 | ||
826 | rd->n_reg_rules = num_rules; | |
827 | rd->alpha2[0] = '9'; | |
828 | rd->alpha2[1] = '8'; | |
829 | ||
830 | return rd; | |
831 | } | |
832 | ||
fb1fc7ad LR |
833 | /* |
834 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
835 | * want to just have the channel structure use these | |
836 | */ | |
b2e1b302 LR |
837 | static u32 map_regdom_flags(u32 rd_flags) |
838 | { | |
839 | u32 channel_flags = 0; | |
840 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
841 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
842 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
843 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
844 | if (rd_flags & NL80211_RRF_DFS) | |
845 | channel_flags |= IEEE80211_CHAN_RADAR; | |
846 | return channel_flags; | |
847 | } | |
848 | ||
1fa25e41 LR |
849 | static int freq_reg_info_regd(struct wiphy *wiphy, |
850 | u32 center_freq, | |
851 | u32 *bandwidth, | |
852 | const struct ieee80211_reg_rule **reg_rule, | |
853 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
854 | { |
855 | int i; | |
0c7dc45d | 856 | bool band_rule_found = false; |
3e0c3ff3 | 857 | const struct ieee80211_regdomain *regd; |
b2e1b302 | 858 | u32 max_bandwidth = 0; |
8318d78a | 859 | |
1fa25e41 | 860 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 861 | |
fb1fc7ad LR |
862 | /* |
863 | * Follow the driver's regulatory domain, if present, unless a country | |
864 | * IE has been processed or a user wants to help complaince further | |
865 | */ | |
7db90f4a LR |
866 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
867 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && | |
3e0c3ff3 LR |
868 | wiphy->regd) |
869 | regd = wiphy->regd; | |
870 | ||
871 | if (!regd) | |
b2e1b302 LR |
872 | return -EINVAL; |
873 | ||
3e0c3ff3 | 874 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
875 | const struct ieee80211_reg_rule *rr; |
876 | const struct ieee80211_freq_range *fr = NULL; | |
877 | const struct ieee80211_power_rule *pr = NULL; | |
878 | ||
3e0c3ff3 | 879 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
880 | fr = &rr->freq_range; |
881 | pr = &rr->power_rule; | |
0c7dc45d | 882 | |
fb1fc7ad LR |
883 | /* |
884 | * We only need to know if one frequency rule was | |
0c7dc45d | 885 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
886 | * not overwrite it once found |
887 | */ | |
0c7dc45d LR |
888 | if (!band_rule_found) |
889 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
890 | ||
b2e1b302 | 891 | max_bandwidth = freq_max_bandwidth(fr, center_freq); |
0c7dc45d | 892 | |
b2e1b302 LR |
893 | if (max_bandwidth && *bandwidth <= max_bandwidth) { |
894 | *reg_rule = rr; | |
895 | *bandwidth = max_bandwidth; | |
8318d78a JB |
896 | break; |
897 | } | |
898 | } | |
899 | ||
0c7dc45d LR |
900 | if (!band_rule_found) |
901 | return -ERANGE; | |
902 | ||
b2e1b302 LR |
903 | return !max_bandwidth; |
904 | } | |
34f57347 | 905 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 906 | |
34f57347 | 907 | int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth, |
1fa25e41 LR |
908 | const struct ieee80211_reg_rule **reg_rule) |
909 | { | |
910 | return freq_reg_info_regd(wiphy, center_freq, | |
911 | bandwidth, reg_rule, NULL); | |
912 | } | |
b2e1b302 | 913 | |
a92a3ce7 LR |
914 | static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, |
915 | unsigned int chan_idx) | |
b2e1b302 LR |
916 | { |
917 | int r; | |
a92a3ce7 | 918 | u32 flags; |
b2e1b302 LR |
919 | u32 max_bandwidth = 0; |
920 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
921 | const struct ieee80211_power_rule *power_rule = NULL; | |
a92a3ce7 LR |
922 | struct ieee80211_supported_band *sband; |
923 | struct ieee80211_channel *chan; | |
fe33eb39 | 924 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 925 | |
761cf7ec LR |
926 | assert_cfg80211_lock(); |
927 | ||
806a9e39 LR |
928 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
929 | ||
a92a3ce7 LR |
930 | sband = wiphy->bands[band]; |
931 | BUG_ON(chan_idx >= sband->n_channels); | |
932 | chan = &sband->channels[chan_idx]; | |
933 | ||
934 | flags = chan->orig_flags; | |
b2e1b302 | 935 | |
3e0c3ff3 | 936 | r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq), |
b2e1b302 LR |
937 | &max_bandwidth, ®_rule); |
938 | ||
939 | if (r) { | |
fb1fc7ad LR |
940 | /* |
941 | * This means no regulatory rule was found in the country IE | |
0c7dc45d LR |
942 | * with a frequency range on the center_freq's band, since |
943 | * IEEE-802.11 allows for a country IE to have a subset of the | |
944 | * regulatory information provided in a country we ignore | |
945 | * disabling the channel unless at least one reg rule was | |
946 | * found on the center_freq's band. For details see this | |
947 | * clarification: | |
948 | * | |
949 | * http://tinyurl.com/11d-clarification | |
950 | */ | |
951 | if (r == -ERANGE && | |
7db90f4a LR |
952 | last_request->initiator == |
953 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
0c7dc45d LR |
954 | #ifdef CONFIG_CFG80211_REG_DEBUG |
955 | printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " | |
956 | "intact on %s - no rule found in band on " | |
957 | "Country IE\n", | |
958 | chan->center_freq, wiphy_name(wiphy)); | |
959 | #endif | |
960 | } else { | |
fb1fc7ad LR |
961 | /* |
962 | * In this case we know the country IE has at least one reg rule | |
963 | * for the band so we respect its band definitions | |
964 | */ | |
0c7dc45d | 965 | #ifdef CONFIG_CFG80211_REG_DEBUG |
7db90f4a LR |
966 | if (last_request->initiator == |
967 | NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
0c7dc45d LR |
968 | printk(KERN_DEBUG "cfg80211: Disabling " |
969 | "channel %d MHz on %s due to " | |
970 | "Country IE\n", | |
971 | chan->center_freq, wiphy_name(wiphy)); | |
972 | #endif | |
973 | flags |= IEEE80211_CHAN_DISABLED; | |
974 | chan->flags = flags; | |
975 | } | |
8318d78a JB |
976 | return; |
977 | } | |
978 | ||
b2e1b302 LR |
979 | power_rule = ®_rule->power_rule; |
980 | ||
7db90f4a | 981 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
806a9e39 LR |
982 | request_wiphy && request_wiphy == wiphy && |
983 | request_wiphy->strict_regulatory) { | |
fb1fc7ad LR |
984 | /* |
985 | * This gaurantees the driver's requested regulatory domain | |
f976376d | 986 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
987 | * settings |
988 | */ | |
f976376d LR |
989 | chan->flags = chan->orig_flags = |
990 | map_regdom_flags(reg_rule->flags); | |
991 | chan->max_antenna_gain = chan->orig_mag = | |
992 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
993 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
994 | chan->max_power = chan->orig_mpwr = | |
995 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
996 | return; | |
997 | } | |
998 | ||
b2e1b302 | 999 | chan->flags = flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 1000 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
1001 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
1002 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 1003 | if (chan->orig_mpwr) |
b2e1b302 LR |
1004 | chan->max_power = min(chan->orig_mpwr, |
1005 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 1006 | else |
b2e1b302 | 1007 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
1008 | } |
1009 | ||
a92a3ce7 | 1010 | static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) |
8318d78a | 1011 | { |
a92a3ce7 LR |
1012 | unsigned int i; |
1013 | struct ieee80211_supported_band *sband; | |
1014 | ||
1015 | BUG_ON(!wiphy->bands[band]); | |
1016 | sband = wiphy->bands[band]; | |
8318d78a JB |
1017 | |
1018 | for (i = 0; i < sband->n_channels; i++) | |
a92a3ce7 | 1019 | handle_channel(wiphy, band, i); |
8318d78a JB |
1020 | } |
1021 | ||
7db90f4a LR |
1022 | static bool ignore_reg_update(struct wiphy *wiphy, |
1023 | enum nl80211_reg_initiator initiator) | |
14b9815a LR |
1024 | { |
1025 | if (!last_request) | |
1026 | return true; | |
7db90f4a | 1027 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
2a44f911 | 1028 | wiphy->custom_regulatory) |
14b9815a | 1029 | return true; |
fb1fc7ad LR |
1030 | /* |
1031 | * wiphy->regd will be set once the device has its own | |
1032 | * desired regulatory domain set | |
1033 | */ | |
f976376d LR |
1034 | if (wiphy->strict_regulatory && !wiphy->regd && |
1035 | !is_world_regdom(last_request->alpha2)) | |
14b9815a LR |
1036 | return true; |
1037 | return false; | |
1038 | } | |
1039 | ||
7db90f4a | 1040 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
8318d78a | 1041 | { |
b2e1b302 | 1042 | struct cfg80211_registered_device *drv; |
8318d78a | 1043 | |
b2e1b302 | 1044 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
7db90f4a | 1045 | wiphy_update_regulatory(&drv->wiphy, initiator); |
b2e1b302 LR |
1046 | } |
1047 | ||
e38f8a7a LR |
1048 | static void handle_reg_beacon(struct wiphy *wiphy, |
1049 | unsigned int chan_idx, | |
1050 | struct reg_beacon *reg_beacon) | |
1051 | { | |
1052 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1053 | #define REG_DEBUG_BEACON_FLAG(desc) \ | |
1054 | printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \ | |
1055 | "frequency: %d MHz (Ch %d) on %s\n", \ | |
1056 | reg_beacon->chan.center_freq, \ | |
1057 | ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \ | |
1058 | wiphy_name(wiphy)); | |
1059 | #else | |
1060 | #define REG_DEBUG_BEACON_FLAG(desc) do {} while (0) | |
1061 | #endif | |
1062 | struct ieee80211_supported_band *sband; | |
1063 | struct ieee80211_channel *chan; | |
1064 | ||
1065 | assert_cfg80211_lock(); | |
1066 | ||
1067 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1068 | chan = &sband->channels[chan_idx]; | |
1069 | ||
1070 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
1071 | return; | |
1072 | ||
1073 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { | |
1074 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; | |
1075 | REG_DEBUG_BEACON_FLAG("active scanning"); | |
1076 | } | |
1077 | ||
1078 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { | |
1079 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; | |
1080 | REG_DEBUG_BEACON_FLAG("beaconing"); | |
1081 | } | |
1082 | ||
1083 | chan->beacon_found = true; | |
1084 | #undef REG_DEBUG_BEACON_FLAG | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * Called when a scan on a wiphy finds a beacon on | |
1089 | * new channel | |
1090 | */ | |
1091 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
1092 | struct reg_beacon *reg_beacon) | |
1093 | { | |
1094 | unsigned int i; | |
1095 | struct ieee80211_supported_band *sband; | |
1096 | ||
1097 | assert_cfg80211_lock(); | |
1098 | ||
1099 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1100 | return; | |
1101 | ||
1102 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1103 | ||
1104 | for (i = 0; i < sband->n_channels; i++) | |
1105 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * Called upon reg changes or a new wiphy is added | |
1110 | */ | |
1111 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1112 | { | |
1113 | unsigned int i; | |
1114 | struct ieee80211_supported_band *sband; | |
1115 | struct reg_beacon *reg_beacon; | |
1116 | ||
1117 | assert_cfg80211_lock(); | |
1118 | ||
1119 | if (list_empty(®_beacon_list)) | |
1120 | return; | |
1121 | ||
1122 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1123 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1124 | continue; | |
1125 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1126 | for (i = 0; i < sband->n_channels; i++) | |
1127 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1128 | } | |
1129 | } | |
1130 | ||
1131 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1132 | { | |
1133 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1134 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1135 | return true; | |
7db90f4a | 1136 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
e38f8a7a LR |
1137 | wiphy->custom_regulatory) |
1138 | return true; | |
1139 | return false; | |
1140 | } | |
1141 | ||
1142 | /* Reap the advantages of previously found beacons */ | |
1143 | static void reg_process_beacons(struct wiphy *wiphy) | |
1144 | { | |
1145 | if (!reg_is_world_roaming(wiphy)) | |
1146 | return; | |
1147 | wiphy_update_beacon_reg(wiphy); | |
1148 | } | |
1149 | ||
7db90f4a LR |
1150 | void wiphy_update_regulatory(struct wiphy *wiphy, |
1151 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1152 | { |
1153 | enum ieee80211_band band; | |
d46e5b1d | 1154 | |
7db90f4a | 1155 | if (ignore_reg_update(wiphy, initiator)) |
e38f8a7a | 1156 | goto out; |
b2e1b302 | 1157 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1158 | if (wiphy->bands[band]) |
a92a3ce7 | 1159 | handle_band(wiphy, band); |
b2e1b302 | 1160 | } |
e38f8a7a LR |
1161 | out: |
1162 | reg_process_beacons(wiphy); | |
560e28e1 | 1163 | if (wiphy->reg_notifier) |
716f9392 | 1164 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1165 | } |
1166 | ||
1fa25e41 LR |
1167 | static void handle_channel_custom(struct wiphy *wiphy, |
1168 | enum ieee80211_band band, | |
1169 | unsigned int chan_idx, | |
1170 | const struct ieee80211_regdomain *regd) | |
1171 | { | |
1172 | int r; | |
1173 | u32 max_bandwidth = 0; | |
1174 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1175 | const struct ieee80211_power_rule *power_rule = NULL; | |
1176 | struct ieee80211_supported_band *sband; | |
1177 | struct ieee80211_channel *chan; | |
1178 | ||
1179 | sband = wiphy->bands[band]; | |
1180 | BUG_ON(chan_idx >= sband->n_channels); | |
1181 | chan = &sband->channels[chan_idx]; | |
1182 | ||
1183 | r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq), | |
1184 | &max_bandwidth, ®_rule, regd); | |
1185 | ||
1186 | if (r) { | |
1187 | chan->flags = IEEE80211_CHAN_DISABLED; | |
1188 | return; | |
1189 | } | |
1190 | ||
1191 | power_rule = ®_rule->power_rule; | |
1192 | ||
1193 | chan->flags |= map_regdom_flags(reg_rule->flags); | |
1194 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
1195 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
1196 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
1197 | } | |
1198 | ||
1199 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1200 | const struct ieee80211_regdomain *regd) | |
1201 | { | |
1202 | unsigned int i; | |
1203 | struct ieee80211_supported_band *sband; | |
1204 | ||
1205 | BUG_ON(!wiphy->bands[band]); | |
1206 | sband = wiphy->bands[band]; | |
1207 | ||
1208 | for (i = 0; i < sband->n_channels; i++) | |
1209 | handle_channel_custom(wiphy, band, i, regd); | |
1210 | } | |
1211 | ||
1212 | /* Used by drivers prior to wiphy registration */ | |
1213 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1214 | const struct ieee80211_regdomain *regd) | |
1215 | { | |
1216 | enum ieee80211_band band; | |
1217 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1218 | if (wiphy->bands[band]) | |
1219 | handle_band_custom(wiphy, band, regd); | |
b2e1b302 LR |
1220 | } |
1221 | } | |
1fa25e41 LR |
1222 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1223 | ||
3e0c3ff3 LR |
1224 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
1225 | const struct ieee80211_regdomain *src_regd) | |
1226 | { | |
1227 | struct ieee80211_regdomain *regd; | |
1228 | int size_of_regd = 0; | |
1229 | unsigned int i; | |
1230 | ||
1231 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1232 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
1233 | ||
1234 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
1235 | if (!regd) | |
1236 | return -ENOMEM; | |
1237 | ||
1238 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
1239 | ||
1240 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
1241 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
1242 | sizeof(struct ieee80211_reg_rule)); | |
1243 | ||
1244 | *dst_regd = regd; | |
1245 | return 0; | |
1246 | } | |
b2e1b302 | 1247 | |
fb1fc7ad LR |
1248 | /* |
1249 | * Return value which can be used by ignore_request() to indicate | |
1250 | * it has been determined we should intersect two regulatory domains | |
1251 | */ | |
9c96477d LR |
1252 | #define REG_INTERSECT 1 |
1253 | ||
84fa4f43 JB |
1254 | /* This has the logic which determines when a new request |
1255 | * should be ignored. */ | |
2f92cd2e LR |
1256 | static int ignore_request(struct wiphy *wiphy, |
1257 | struct regulatory_request *pending_request) | |
84fa4f43 | 1258 | { |
806a9e39 | 1259 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1260 | |
1261 | assert_cfg80211_lock(); | |
1262 | ||
84fa4f43 JB |
1263 | /* All initial requests are respected */ |
1264 | if (!last_request) | |
1265 | return 0; | |
1266 | ||
2f92cd2e | 1267 | switch (pending_request->initiator) { |
7db90f4a | 1268 | case NL80211_REGDOM_SET_BY_CORE: |
ba25c141 | 1269 | return -EINVAL; |
7db90f4a | 1270 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1271 | |
1272 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1273 | ||
2f92cd2e | 1274 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1275 | return -EINVAL; |
7db90f4a LR |
1276 | if (last_request->initiator == |
1277 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1278 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1279 | /* |
1280 | * Two cards with two APs claiming different | |
1281 | * different Country IE alpha2s. We could | |
1282 | * intersect them, but that seems unlikely | |
1283 | * to be correct. Reject second one for now. | |
1284 | */ | |
2f92cd2e | 1285 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1286 | return -EOPNOTSUPP; |
1287 | return -EALREADY; | |
1288 | } | |
fb1fc7ad LR |
1289 | /* |
1290 | * Two consecutive Country IE hints on the same wiphy. | |
1291 | * This should be picked up early by the driver/stack | |
1292 | */ | |
2f92cd2e | 1293 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1294 | return 0; |
1295 | return -EALREADY; | |
1296 | } | |
3f2355cb | 1297 | return REG_INTERSECT; |
7db90f4a LR |
1298 | case NL80211_REGDOM_SET_BY_DRIVER: |
1299 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
e74b1e7f LR |
1300 | if (is_old_static_regdom(cfg80211_regdomain)) |
1301 | return 0; | |
2f92cd2e | 1302 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1303 | return 0; |
84fa4f43 | 1304 | return -EALREADY; |
e74b1e7f | 1305 | } |
fff32c04 LR |
1306 | |
1307 | /* | |
1308 | * This would happen if you unplug and plug your card | |
1309 | * back in or if you add a new device for which the previously | |
1310 | * loaded card also agrees on the regulatory domain. | |
1311 | */ | |
7db90f4a | 1312 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1313 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1314 | return -EALREADY; |
1315 | ||
3e0c3ff3 | 1316 | return REG_INTERSECT; |
7db90f4a LR |
1317 | case NL80211_REGDOM_SET_BY_USER: |
1318 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1319 | return REG_INTERSECT; |
fb1fc7ad LR |
1320 | /* |
1321 | * If the user knows better the user should set the regdom | |
1322 | * to their country before the IE is picked up | |
1323 | */ | |
7db90f4a | 1324 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1325 | last_request->intersect) |
1326 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1327 | /* |
1328 | * Process user requests only after previous user/driver/core | |
1329 | * requests have been processed | |
1330 | */ | |
7db90f4a LR |
1331 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1332 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1333 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
69b1572b | 1334 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1335 | return -EAGAIN; |
1336 | } | |
1337 | ||
e74b1e7f | 1338 | if (!is_old_static_regdom(cfg80211_regdomain) && |
2f92cd2e | 1339 | !regdom_changes(pending_request->alpha2)) |
e74b1e7f LR |
1340 | return -EALREADY; |
1341 | ||
84fa4f43 JB |
1342 | return 0; |
1343 | } | |
1344 | ||
1345 | return -EINVAL; | |
1346 | } | |
1347 | ||
d1c96a9a LR |
1348 | /** |
1349 | * __regulatory_hint - hint to the wireless core a regulatory domain | |
1350 | * @wiphy: if the hint comes from country information from an AP, this | |
1351 | * is required to be set to the wiphy that received the information | |
28da32d7 | 1352 | * @pending_request: the regulatory request currently being processed |
d1c96a9a LR |
1353 | * |
1354 | * The Wireless subsystem can use this function to hint to the wireless core | |
28da32d7 | 1355 | * what it believes should be the current regulatory domain. |
d1c96a9a LR |
1356 | * |
1357 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1358 | * already been set or other standard error codes. | |
1359 | * | |
1360 | * Caller must hold &cfg80211_mutex | |
1361 | */ | |
28da32d7 LR |
1362 | static int __regulatory_hint(struct wiphy *wiphy, |
1363 | struct regulatory_request *pending_request) | |
b2e1b302 | 1364 | { |
9c96477d | 1365 | bool intersect = false; |
b2e1b302 LR |
1366 | int r = 0; |
1367 | ||
761cf7ec LR |
1368 | assert_cfg80211_lock(); |
1369 | ||
2f92cd2e | 1370 | r = ignore_request(wiphy, pending_request); |
9c96477d | 1371 | |
3e0c3ff3 | 1372 | if (r == REG_INTERSECT) { |
7db90f4a LR |
1373 | if (pending_request->initiator == |
1374 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1375 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1376 | if (r) { |
1377 | kfree(pending_request); | |
3e0c3ff3 | 1378 | return r; |
d951c1dd | 1379 | } |
3e0c3ff3 | 1380 | } |
9c96477d | 1381 | intersect = true; |
3e0c3ff3 | 1382 | } else if (r) { |
fb1fc7ad LR |
1383 | /* |
1384 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1385 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1386 | * wiphy |
1387 | */ | |
28da32d7 | 1388 | if (r == -EALREADY && |
7db90f4a LR |
1389 | pending_request->initiator == |
1390 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1391 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1392 | if (r) { |
1393 | kfree(pending_request); | |
3e0c3ff3 | 1394 | return r; |
d951c1dd | 1395 | } |
3e0c3ff3 LR |
1396 | r = -EALREADY; |
1397 | goto new_request; | |
1398 | } | |
d951c1dd | 1399 | kfree(pending_request); |
b2e1b302 | 1400 | return r; |
3e0c3ff3 | 1401 | } |
b2e1b302 | 1402 | |
3e0c3ff3 | 1403 | new_request: |
d951c1dd | 1404 | kfree(last_request); |
5203cdb6 | 1405 | |
d951c1dd LR |
1406 | last_request = pending_request; |
1407 | last_request->intersect = intersect; | |
5203cdb6 | 1408 | |
d951c1dd | 1409 | pending_request = NULL; |
3e0c3ff3 LR |
1410 | |
1411 | /* When r == REG_INTERSECT we do need to call CRDA */ | |
73d54c9e LR |
1412 | if (r < 0) { |
1413 | /* | |
1414 | * Since CRDA will not be called in this case as we already | |
1415 | * have applied the requested regulatory domain before we just | |
1416 | * inform userspace we have processed the request | |
1417 | */ | |
1418 | if (r == -EALREADY) | |
1419 | nl80211_send_reg_change_event(last_request); | |
3e0c3ff3 | 1420 | return r; |
73d54c9e | 1421 | } |
3e0c3ff3 | 1422 | |
d951c1dd | 1423 | return call_crda(last_request->alpha2); |
b2e1b302 LR |
1424 | } |
1425 | ||
fe33eb39 | 1426 | /* This currently only processes user and driver regulatory hints */ |
d951c1dd | 1427 | static void reg_process_hint(struct regulatory_request *reg_request) |
fe33eb39 LR |
1428 | { |
1429 | int r = 0; | |
1430 | struct wiphy *wiphy = NULL; | |
1431 | ||
1432 | BUG_ON(!reg_request->alpha2); | |
1433 | ||
1434 | mutex_lock(&cfg80211_mutex); | |
1435 | ||
1436 | if (wiphy_idx_valid(reg_request->wiphy_idx)) | |
1437 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1438 | ||
7db90f4a | 1439 | if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
fe33eb39 | 1440 | !wiphy) { |
d951c1dd | 1441 | kfree(reg_request); |
fe33eb39 LR |
1442 | goto out; |
1443 | } | |
1444 | ||
28da32d7 | 1445 | r = __regulatory_hint(wiphy, reg_request); |
fe33eb39 LR |
1446 | /* This is required so that the orig_* parameters are saved */ |
1447 | if (r == -EALREADY && wiphy && wiphy->strict_regulatory) | |
1448 | wiphy_update_regulatory(wiphy, reg_request->initiator); | |
1449 | out: | |
1450 | mutex_unlock(&cfg80211_mutex); | |
fe33eb39 LR |
1451 | } |
1452 | ||
7db90f4a | 1453 | /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */ |
fe33eb39 LR |
1454 | static void reg_process_pending_hints(void) |
1455 | { | |
1456 | struct regulatory_request *reg_request; | |
fe33eb39 LR |
1457 | |
1458 | spin_lock(®_requests_lock); | |
1459 | while (!list_empty(®_requests_list)) { | |
1460 | reg_request = list_first_entry(®_requests_list, | |
1461 | struct regulatory_request, | |
1462 | list); | |
1463 | list_del_init(®_request->list); | |
fe33eb39 | 1464 | |
d951c1dd LR |
1465 | spin_unlock(®_requests_lock); |
1466 | reg_process_hint(reg_request); | |
fe33eb39 LR |
1467 | spin_lock(®_requests_lock); |
1468 | } | |
1469 | spin_unlock(®_requests_lock); | |
1470 | } | |
1471 | ||
e38f8a7a LR |
1472 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1473 | static void reg_process_pending_beacon_hints(void) | |
1474 | { | |
1475 | struct cfg80211_registered_device *drv; | |
1476 | struct reg_beacon *pending_beacon, *tmp; | |
1477 | ||
1478 | mutex_lock(&cfg80211_mutex); | |
1479 | ||
1480 | /* This goes through the _pending_ beacon list */ | |
1481 | spin_lock_bh(®_pending_beacons_lock); | |
1482 | ||
1483 | if (list_empty(®_pending_beacons)) { | |
1484 | spin_unlock_bh(®_pending_beacons_lock); | |
1485 | goto out; | |
1486 | } | |
1487 | ||
1488 | list_for_each_entry_safe(pending_beacon, tmp, | |
1489 | ®_pending_beacons, list) { | |
1490 | ||
1491 | list_del_init(&pending_beacon->list); | |
1492 | ||
1493 | /* Applies the beacon hint to current wiphys */ | |
1494 | list_for_each_entry(drv, &cfg80211_drv_list, list) | |
1495 | wiphy_update_new_beacon(&drv->wiphy, pending_beacon); | |
1496 | ||
1497 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
1498 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
1499 | } | |
1500 | ||
1501 | spin_unlock_bh(®_pending_beacons_lock); | |
1502 | out: | |
1503 | mutex_unlock(&cfg80211_mutex); | |
1504 | } | |
1505 | ||
fe33eb39 LR |
1506 | static void reg_todo(struct work_struct *work) |
1507 | { | |
1508 | reg_process_pending_hints(); | |
e38f8a7a | 1509 | reg_process_pending_beacon_hints(); |
fe33eb39 LR |
1510 | } |
1511 | ||
1512 | static DECLARE_WORK(reg_work, reg_todo); | |
1513 | ||
1514 | static void queue_regulatory_request(struct regulatory_request *request) | |
1515 | { | |
1516 | spin_lock(®_requests_lock); | |
1517 | list_add_tail(&request->list, ®_requests_list); | |
1518 | spin_unlock(®_requests_lock); | |
1519 | ||
1520 | schedule_work(®_work); | |
1521 | } | |
1522 | ||
1523 | /* Core regulatory hint -- happens once during cfg80211_init() */ | |
ba25c141 LR |
1524 | static int regulatory_hint_core(const char *alpha2) |
1525 | { | |
1526 | struct regulatory_request *request; | |
1527 | ||
1528 | BUG_ON(last_request); | |
1529 | ||
1530 | request = kzalloc(sizeof(struct regulatory_request), | |
1531 | GFP_KERNEL); | |
1532 | if (!request) | |
1533 | return -ENOMEM; | |
1534 | ||
1535 | request->alpha2[0] = alpha2[0]; | |
1536 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1537 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
ba25c141 | 1538 | |
fe33eb39 | 1539 | queue_regulatory_request(request); |
ba25c141 | 1540 | |
fe33eb39 | 1541 | return 0; |
ba25c141 LR |
1542 | } |
1543 | ||
fe33eb39 LR |
1544 | /* User hints */ |
1545 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1546 | { |
fe33eb39 LR |
1547 | struct regulatory_request *request; |
1548 | ||
be3d4810 | 1549 | BUG_ON(!alpha2); |
b2e1b302 | 1550 | |
fe33eb39 LR |
1551 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1552 | if (!request) | |
1553 | return -ENOMEM; | |
1554 | ||
1555 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1556 | request->alpha2[0] = alpha2[0]; | |
1557 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1558 | request->initiator = NL80211_REGDOM_SET_BY_USER, |
fe33eb39 LR |
1559 | |
1560 | queue_regulatory_request(request); | |
1561 | ||
1562 | return 0; | |
1563 | } | |
1564 | ||
1565 | /* Driver hints */ | |
1566 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1567 | { | |
1568 | struct regulatory_request *request; | |
1569 | ||
1570 | BUG_ON(!alpha2); | |
1571 | BUG_ON(!wiphy); | |
1572 | ||
1573 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1574 | if (!request) | |
1575 | return -ENOMEM; | |
1576 | ||
1577 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1578 | ||
1579 | /* Must have registered wiphy first */ | |
1580 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1581 | ||
1582 | request->alpha2[0] = alpha2[0]; | |
1583 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1584 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
fe33eb39 LR |
1585 | |
1586 | queue_regulatory_request(request); | |
1587 | ||
1588 | return 0; | |
b2e1b302 LR |
1589 | } |
1590 | EXPORT_SYMBOL(regulatory_hint); | |
1591 | ||
3f2355cb LR |
1592 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, |
1593 | u32 country_ie_checksum) | |
1594 | { | |
806a9e39 LR |
1595 | struct wiphy *request_wiphy; |
1596 | ||
761cf7ec LR |
1597 | assert_cfg80211_lock(); |
1598 | ||
cc0b6fe8 LR |
1599 | if (unlikely(last_request->initiator != |
1600 | NL80211_REGDOM_SET_BY_COUNTRY_IE)) | |
1601 | return false; | |
1602 | ||
806a9e39 LR |
1603 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1604 | ||
1605 | if (!request_wiphy) | |
3f2355cb | 1606 | return false; |
806a9e39 LR |
1607 | |
1608 | if (likely(request_wiphy != wiphy)) | |
3f2355cb | 1609 | return !country_ie_integrity_changes(country_ie_checksum); |
fb1fc7ad LR |
1610 | /* |
1611 | * We should not have let these through at this point, they | |
3f2355cb | 1612 | * should have been picked up earlier by the first alpha2 check |
fb1fc7ad LR |
1613 | * on the device |
1614 | */ | |
3f2355cb LR |
1615 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) |
1616 | return true; | |
1617 | return false; | |
1618 | } | |
1619 | ||
1620 | void regulatory_hint_11d(struct wiphy *wiphy, | |
1621 | u8 *country_ie, | |
1622 | u8 country_ie_len) | |
1623 | { | |
1624 | struct ieee80211_regdomain *rd = NULL; | |
1625 | char alpha2[2]; | |
1626 | u32 checksum = 0; | |
1627 | enum environment_cap env = ENVIRON_ANY; | |
fe33eb39 | 1628 | struct regulatory_request *request; |
3f2355cb | 1629 | |
a1794390 | 1630 | mutex_lock(&cfg80211_mutex); |
3f2355cb | 1631 | |
d335fe63 LR |
1632 | if (unlikely(!last_request)) { |
1633 | mutex_unlock(&cfg80211_mutex); | |
1634 | return; | |
1635 | } | |
1636 | ||
3f2355cb LR |
1637 | /* IE len must be evenly divisible by 2 */ |
1638 | if (country_ie_len & 0x01) | |
1639 | goto out; | |
1640 | ||
1641 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1642 | goto out; | |
1643 | ||
fb1fc7ad LR |
1644 | /* |
1645 | * Pending country IE processing, this can happen after we | |
3f2355cb | 1646 | * call CRDA and wait for a response if a beacon was received before |
fb1fc7ad LR |
1647 | * we were able to process the last regulatory_hint_11d() call |
1648 | */ | |
3f2355cb LR |
1649 | if (country_ie_regdomain) |
1650 | goto out; | |
1651 | ||
1652 | alpha2[0] = country_ie[0]; | |
1653 | alpha2[1] = country_ie[1]; | |
1654 | ||
1655 | if (country_ie[2] == 'I') | |
1656 | env = ENVIRON_INDOOR; | |
1657 | else if (country_ie[2] == 'O') | |
1658 | env = ENVIRON_OUTDOOR; | |
1659 | ||
fb1fc7ad LR |
1660 | /* |
1661 | * We will run this for *every* beacon processed for the BSSID, so | |
3f2355cb | 1662 | * we optimize an early check to exit out early if we don't have to |
fb1fc7ad LR |
1663 | * do anything |
1664 | */ | |
cc0b6fe8 LR |
1665 | if (likely(last_request->initiator == |
1666 | NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1667 | wiphy_idx_valid(last_request->wiphy_idx))) { | |
3f2355cb LR |
1668 | struct cfg80211_registered_device *drv_last_ie; |
1669 | ||
806a9e39 LR |
1670 | drv_last_ie = |
1671 | cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx); | |
3f2355cb | 1672 | |
fb1fc7ad LR |
1673 | /* |
1674 | * Lets keep this simple -- we trust the first AP | |
1675 | * after we intersect with CRDA | |
1676 | */ | |
806a9e39 | 1677 | if (likely(&drv_last_ie->wiphy == wiphy)) { |
fb1fc7ad LR |
1678 | /* |
1679 | * Ignore IEs coming in on this wiphy with | |
1680 | * the same alpha2 and environment cap | |
1681 | */ | |
3f2355cb LR |
1682 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, |
1683 | alpha2) && | |
1684 | env == drv_last_ie->env)) { | |
1685 | goto out; | |
1686 | } | |
fb1fc7ad LR |
1687 | /* |
1688 | * the wiphy moved on to another BSSID or the AP | |
3f2355cb LR |
1689 | * was reconfigured. XXX: We need to deal with the |
1690 | * case where the user suspends and goes to goes | |
1691 | * to another country, and then gets IEs from an | |
fb1fc7ad LR |
1692 | * AP with different settings |
1693 | */ | |
3f2355cb LR |
1694 | goto out; |
1695 | } else { | |
fb1fc7ad LR |
1696 | /* |
1697 | * Ignore IEs coming in on two separate wiphys with | |
1698 | * the same alpha2 and environment cap | |
1699 | */ | |
3f2355cb LR |
1700 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, |
1701 | alpha2) && | |
1702 | env == drv_last_ie->env)) { | |
1703 | goto out; | |
1704 | } | |
1705 | /* We could potentially intersect though */ | |
1706 | goto out; | |
1707 | } | |
1708 | } | |
1709 | ||
1710 | rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); | |
1711 | if (!rd) | |
1712 | goto out; | |
1713 | ||
915278e0 LR |
1714 | /* |
1715 | * This will not happen right now but we leave it here for the | |
3f2355cb LR |
1716 | * the future when we want to add suspend/resume support and having |
1717 | * the user move to another country after doing so, or having the user | |
915278e0 LR |
1718 | * move to another AP. Right now we just trust the first AP. |
1719 | * | |
1720 | * If we hit this before we add this support we want to be informed of | |
1721 | * it as it would indicate a mistake in the current design | |
1722 | */ | |
1723 | if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum))) | |
0441d6ff | 1724 | goto free_rd_out; |
3f2355cb | 1725 | |
fe33eb39 LR |
1726 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1727 | if (!request) | |
1728 | goto free_rd_out; | |
1729 | ||
fb1fc7ad LR |
1730 | /* |
1731 | * We keep this around for when CRDA comes back with a response so | |
1732 | * we can intersect with that | |
1733 | */ | |
3f2355cb LR |
1734 | country_ie_regdomain = rd; |
1735 | ||
fe33eb39 LR |
1736 | request->wiphy_idx = get_wiphy_idx(wiphy); |
1737 | request->alpha2[0] = rd->alpha2[0]; | |
1738 | request->alpha2[1] = rd->alpha2[1]; | |
7db90f4a | 1739 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
fe33eb39 LR |
1740 | request->country_ie_checksum = checksum; |
1741 | request->country_ie_env = env; | |
1742 | ||
1743 | mutex_unlock(&cfg80211_mutex); | |
3f2355cb | 1744 | |
fe33eb39 LR |
1745 | queue_regulatory_request(request); |
1746 | ||
1747 | return; | |
0441d6ff LR |
1748 | |
1749 | free_rd_out: | |
1750 | kfree(rd); | |
3f2355cb | 1751 | out: |
a1794390 | 1752 | mutex_unlock(&cfg80211_mutex); |
3f2355cb LR |
1753 | } |
1754 | EXPORT_SYMBOL(regulatory_hint_11d); | |
b2e1b302 | 1755 | |
e38f8a7a LR |
1756 | static bool freq_is_chan_12_13_14(u16 freq) |
1757 | { | |
1758 | if (freq == ieee80211_channel_to_frequency(12) || | |
1759 | freq == ieee80211_channel_to_frequency(13) || | |
1760 | freq == ieee80211_channel_to_frequency(14)) | |
1761 | return true; | |
1762 | return false; | |
1763 | } | |
1764 | ||
1765 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
1766 | struct ieee80211_channel *beacon_chan, | |
1767 | gfp_t gfp) | |
1768 | { | |
1769 | struct reg_beacon *reg_beacon; | |
1770 | ||
1771 | if (likely((beacon_chan->beacon_found || | |
1772 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || | |
1773 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
1774 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) | |
1775 | return 0; | |
1776 | ||
1777 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
1778 | if (!reg_beacon) | |
1779 | return -ENOMEM; | |
1780 | ||
1781 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1782 | printk(KERN_DEBUG "cfg80211: Found new beacon on " | |
1783 | "frequency: %d MHz (Ch %d) on %s\n", | |
1784 | beacon_chan->center_freq, | |
1785 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
1786 | wiphy_name(wiphy)); | |
1787 | #endif | |
1788 | memcpy(®_beacon->chan, beacon_chan, | |
1789 | sizeof(struct ieee80211_channel)); | |
1790 | ||
1791 | ||
1792 | /* | |
1793 | * Since we can be called from BH or and non-BH context | |
1794 | * we must use spin_lock_bh() | |
1795 | */ | |
1796 | spin_lock_bh(®_pending_beacons_lock); | |
1797 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
1798 | spin_unlock_bh(®_pending_beacons_lock); | |
1799 | ||
1800 | schedule_work(®_work); | |
1801 | ||
1802 | return 0; | |
1803 | } | |
1804 | ||
a3d2eaf0 | 1805 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1806 | { |
1807 | unsigned int i; | |
a3d2eaf0 JB |
1808 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1809 | const struct ieee80211_freq_range *freq_range = NULL; | |
1810 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
1811 | |
1812 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
1813 | "(max_antenna_gain, max_eirp)\n"); | |
1814 | ||
1815 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1816 | reg_rule = &rd->reg_rules[i]; | |
1817 | freq_range = ®_rule->freq_range; | |
1818 | power_rule = ®_rule->power_rule; | |
1819 | ||
fb1fc7ad LR |
1820 | /* |
1821 | * There may not be documentation for max antenna gain | |
1822 | * in certain regions | |
1823 | */ | |
b2e1b302 LR |
1824 | if (power_rule->max_antenna_gain) |
1825 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1826 | "(%d mBi, %d mBm)\n", | |
1827 | freq_range->start_freq_khz, | |
1828 | freq_range->end_freq_khz, | |
1829 | freq_range->max_bandwidth_khz, | |
1830 | power_rule->max_antenna_gain, | |
1831 | power_rule->max_eirp); | |
1832 | else | |
1833 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1834 | "(N/A, %d mBm)\n", | |
1835 | freq_range->start_freq_khz, | |
1836 | freq_range->end_freq_khz, | |
1837 | freq_range->max_bandwidth_khz, | |
1838 | power_rule->max_eirp); | |
1839 | } | |
1840 | } | |
1841 | ||
a3d2eaf0 | 1842 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1843 | { |
1844 | ||
3f2355cb | 1845 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 1846 | |
7db90f4a LR |
1847 | if (last_request->initiator == |
1848 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 LR |
1849 | struct cfg80211_registered_device *drv; |
1850 | drv = cfg80211_drv_by_wiphy_idx( | |
1851 | last_request->wiphy_idx); | |
1852 | if (drv) { | |
3f2355cb LR |
1853 | printk(KERN_INFO "cfg80211: Current regulatory " |
1854 | "domain updated by AP to: %c%c\n", | |
1855 | drv->country_ie_alpha2[0], | |
1856 | drv->country_ie_alpha2[1]); | |
1857 | } else | |
1858 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1859 | "domain intersected: \n"); | |
1860 | } else | |
1861 | printk(KERN_INFO "cfg80211: Current regulatory " | |
039498c6 | 1862 | "domain intersected: \n"); |
3f2355cb | 1863 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
1864 | printk(KERN_INFO "cfg80211: World regulatory " |
1865 | "domain updated:\n"); | |
1866 | else { | |
1867 | if (is_unknown_alpha2(rd->alpha2)) | |
1868 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1869 | "changed to driver built-in settings " | |
1870 | "(unknown country)\n"); | |
1871 | else | |
1872 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1873 | "changed to country: %c%c\n", | |
1874 | rd->alpha2[0], rd->alpha2[1]); | |
1875 | } | |
1876 | print_rd_rules(rd); | |
1877 | } | |
1878 | ||
2df78167 | 1879 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1880 | { |
1881 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1882 | rd->alpha2[0], rd->alpha2[1]); | |
1883 | print_rd_rules(rd); | |
1884 | } | |
1885 | ||
3f2355cb LR |
1886 | #ifdef CONFIG_CFG80211_REG_DEBUG |
1887 | static void reg_country_ie_process_debug( | |
1888 | const struct ieee80211_regdomain *rd, | |
1889 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1890 | const struct ieee80211_regdomain *intersected_rd) | |
1891 | { | |
1892 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
1893 | print_regdomain_info(country_ie_regdomain); | |
1894 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
1895 | print_regdomain_info(rd); | |
1896 | if (intersected_rd) { | |
1897 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
1898 | "and get:\n"); | |
667ecd01 | 1899 | print_regdomain_info(intersected_rd); |
3f2355cb LR |
1900 | return; |
1901 | } | |
1902 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
1903 | } | |
1904 | #else | |
1905 | static inline void reg_country_ie_process_debug( | |
1906 | const struct ieee80211_regdomain *rd, | |
1907 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1908 | const struct ieee80211_regdomain *intersected_rd) | |
1909 | { | |
1910 | } | |
1911 | #endif | |
1912 | ||
d2372b31 | 1913 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1914 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1915 | { |
9c96477d | 1916 | const struct ieee80211_regdomain *intersected_rd = NULL; |
3f2355cb | 1917 | struct cfg80211_registered_device *drv = NULL; |
806a9e39 | 1918 | struct wiphy *request_wiphy; |
b2e1b302 LR |
1919 | /* Some basic sanity checks first */ |
1920 | ||
b2e1b302 | 1921 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1922 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1923 | return -EINVAL; |
1924 | update_world_regdomain(rd); | |
1925 | return 0; | |
1926 | } | |
b2e1b302 LR |
1927 | |
1928 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1929 | !is_unknown_alpha2(rd->alpha2)) | |
1930 | return -EINVAL; | |
1931 | ||
f6037d09 | 1932 | if (!last_request) |
b2e1b302 LR |
1933 | return -EINVAL; |
1934 | ||
fb1fc7ad LR |
1935 | /* |
1936 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 1937 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
1938 | * and the pending request came in from a country IE |
1939 | */ | |
7db90f4a | 1940 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
1941 | /* |
1942 | * If someone else asked us to change the rd lets only bother | |
1943 | * checking if the alpha2 changes if CRDA was already called | |
1944 | */ | |
3f2355cb | 1945 | if (!is_old_static_regdom(cfg80211_regdomain) && |
69b1572b | 1946 | !regdom_changes(rd->alpha2)) |
3f2355cb LR |
1947 | return -EINVAL; |
1948 | } | |
1949 | ||
fb1fc7ad LR |
1950 | /* |
1951 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
1952 | * and finally inform them of what we have done, in case they want |
1953 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
1954 | * internal EEPROM data |
1955 | */ | |
b2e1b302 | 1956 | |
f6037d09 | 1957 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1958 | return -EINVAL; |
1959 | ||
8375af3b LR |
1960 | if (!is_valid_rd(rd)) { |
1961 | printk(KERN_ERR "cfg80211: Invalid " | |
1962 | "regulatory domain detected:\n"); | |
1963 | print_regdomain_info(rd); | |
1964 | return -EINVAL; | |
b2e1b302 LR |
1965 | } |
1966 | ||
806a9e39 LR |
1967 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1968 | ||
b8295acd | 1969 | if (!last_request->intersect) { |
3e0c3ff3 LR |
1970 | int r; |
1971 | ||
7db90f4a | 1972 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
3e0c3ff3 LR |
1973 | reset_regdomains(); |
1974 | cfg80211_regdomain = rd; | |
1975 | return 0; | |
1976 | } | |
1977 | ||
fb1fc7ad LR |
1978 | /* |
1979 | * For a driver hint, lets copy the regulatory domain the | |
1980 | * driver wanted to the wiphy to deal with conflicts | |
1981 | */ | |
3e0c3ff3 | 1982 | |
806a9e39 | 1983 | BUG_ON(request_wiphy->regd); |
3e0c3ff3 | 1984 | |
806a9e39 | 1985 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
1986 | if (r) |
1987 | return r; | |
1988 | ||
b8295acd LR |
1989 | reset_regdomains(); |
1990 | cfg80211_regdomain = rd; | |
1991 | return 0; | |
1992 | } | |
1993 | ||
1994 | /* Intersection requires a bit more work */ | |
1995 | ||
7db90f4a | 1996 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 1997 | |
9c96477d LR |
1998 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
1999 | if (!intersected_rd) | |
2000 | return -EINVAL; | |
b8295acd | 2001 | |
fb1fc7ad LR |
2002 | /* |
2003 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 2004 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
2005 | * domain we keep it for its private use |
2006 | */ | |
7db90f4a | 2007 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 2008 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
2009 | else |
2010 | kfree(rd); | |
2011 | ||
b8295acd LR |
2012 | rd = NULL; |
2013 | ||
2014 | reset_regdomains(); | |
2015 | cfg80211_regdomain = intersected_rd; | |
2016 | ||
2017 | return 0; | |
9c96477d LR |
2018 | } |
2019 | ||
3f2355cb LR |
2020 | /* |
2021 | * Country IE requests are handled a bit differently, we intersect | |
2022 | * the country IE rd with what CRDA believes that country should have | |
2023 | */ | |
2024 | ||
2025 | BUG_ON(!country_ie_regdomain); | |
86f04680 | 2026 | BUG_ON(rd == country_ie_regdomain); |
3f2355cb | 2027 | |
86f04680 LR |
2028 | /* |
2029 | * Intersect what CRDA returned and our what we | |
2030 | * had built from the Country IE received | |
2031 | */ | |
3f2355cb | 2032 | |
86f04680 | 2033 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); |
3f2355cb | 2034 | |
86f04680 LR |
2035 | reg_country_ie_process_debug(rd, |
2036 | country_ie_regdomain, | |
2037 | intersected_rd); | |
3f2355cb | 2038 | |
86f04680 LR |
2039 | kfree(country_ie_regdomain); |
2040 | country_ie_regdomain = NULL; | |
3f2355cb LR |
2041 | |
2042 | if (!intersected_rd) | |
2043 | return -EINVAL; | |
2044 | ||
806a9e39 | 2045 | drv = wiphy_to_dev(request_wiphy); |
3f2355cb LR |
2046 | |
2047 | drv->country_ie_alpha2[0] = rd->alpha2[0]; | |
2048 | drv->country_ie_alpha2[1] = rd->alpha2[1]; | |
2049 | drv->env = last_request->country_ie_env; | |
2050 | ||
2051 | BUG_ON(intersected_rd == rd); | |
2052 | ||
2053 | kfree(rd); | |
2054 | rd = NULL; | |
2055 | ||
b8295acd | 2056 | reset_regdomains(); |
3f2355cb | 2057 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2058 | |
2059 | return 0; | |
2060 | } | |
2061 | ||
2062 | ||
fb1fc7ad LR |
2063 | /* |
2064 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2065 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2066 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2067 | */ | |
a3d2eaf0 | 2068 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2069 | { |
b2e1b302 LR |
2070 | int r; |
2071 | ||
761cf7ec LR |
2072 | assert_cfg80211_lock(); |
2073 | ||
b2e1b302 LR |
2074 | /* Note that this doesn't update the wiphys, this is done below */ |
2075 | r = __set_regdom(rd); | |
d2372b31 JB |
2076 | if (r) { |
2077 | kfree(rd); | |
b2e1b302 | 2078 | return r; |
d2372b31 | 2079 | } |
b2e1b302 | 2080 | |
b2e1b302 | 2081 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2082 | if (!last_request->intersect) |
2083 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2084 | |
2085 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2086 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2087 | |
a01ddafd | 2088 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2089 | |
73d54c9e LR |
2090 | nl80211_send_reg_change_event(last_request); |
2091 | ||
b2e1b302 LR |
2092 | return r; |
2093 | } | |
2094 | ||
a1794390 | 2095 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2096 | void reg_device_remove(struct wiphy *wiphy) |
2097 | { | |
806a9e39 LR |
2098 | struct wiphy *request_wiphy; |
2099 | ||
761cf7ec LR |
2100 | assert_cfg80211_lock(); |
2101 | ||
806a9e39 LR |
2102 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
2103 | ||
3e0c3ff3 | 2104 | kfree(wiphy->regd); |
806a9e39 | 2105 | if (!last_request || !request_wiphy) |
3f2355cb | 2106 | return; |
806a9e39 | 2107 | if (request_wiphy != wiphy) |
3f2355cb | 2108 | return; |
806a9e39 | 2109 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb LR |
2110 | last_request->country_ie_env = ENVIRON_ANY; |
2111 | } | |
2112 | ||
b2e1b302 LR |
2113 | int regulatory_init(void) |
2114 | { | |
bcf4f99b | 2115 | int err = 0; |
734366de | 2116 | |
b2e1b302 LR |
2117 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2118 | if (IS_ERR(reg_pdev)) | |
2119 | return PTR_ERR(reg_pdev); | |
734366de | 2120 | |
fe33eb39 | 2121 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2122 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2123 | |
734366de | 2124 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY |
a3d2eaf0 | 2125 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 2126 | |
942b25cf | 2127 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de | 2128 | print_regdomain_info(cfg80211_regdomain); |
fb1fc7ad LR |
2129 | /* |
2130 | * The old code still requests for a new regdomain and if | |
734366de | 2131 | * you have CRDA you get it updated, otherwise you get |
2e097dc6 LR |
2132 | * stuck with the static values. Since "EU" is not a valid |
2133 | * ISO / IEC 3166 alpha2 code we can't expect userpace to | |
2134 | * give us a regulatory domain for it. We need last_request | |
2135 | * iniitalized though so lets just send a request which we | |
2136 | * know will be ignored... this crap will be removed once | |
2137 | * OLD_REG dies. | |
fb1fc7ad | 2138 | */ |
2e097dc6 | 2139 | err = regulatory_hint_core(ieee80211_regdom); |
734366de | 2140 | #else |
a3d2eaf0 | 2141 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2142 | |
6ee7d330 | 2143 | err = regulatory_hint_core(ieee80211_regdom); |
bcf4f99b | 2144 | #endif |
ba25c141 | 2145 | if (err) { |
bcf4f99b LR |
2146 | if (err == -ENOMEM) |
2147 | return err; | |
2148 | /* | |
2149 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2150 | * memory which is handled and propagated appropriately above | |
2151 | * but it can also fail during a netlink_broadcast() or during | |
2152 | * early boot for call_usermodehelper(). For now treat these | |
2153 | * errors as non-fatal. | |
2154 | */ | |
2155 | printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " | |
2156 | "to call CRDA during init"); | |
2157 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
2158 | /* We want to find out exactly why when debugging */ | |
2159 | WARN_ON(err); | |
734366de | 2160 | #endif |
bcf4f99b | 2161 | } |
734366de | 2162 | |
b2e1b302 LR |
2163 | return 0; |
2164 | } | |
2165 | ||
2166 | void regulatory_exit(void) | |
2167 | { | |
fe33eb39 | 2168 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2169 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2170 | |
2171 | cancel_work_sync(®_work); | |
2172 | ||
a1794390 | 2173 | mutex_lock(&cfg80211_mutex); |
734366de | 2174 | |
b2e1b302 | 2175 | reset_regdomains(); |
734366de | 2176 | |
3f2355cb LR |
2177 | kfree(country_ie_regdomain); |
2178 | country_ie_regdomain = NULL; | |
2179 | ||
f6037d09 JB |
2180 | kfree(last_request); |
2181 | ||
b2e1b302 | 2182 | platform_device_unregister(reg_pdev); |
734366de | 2183 | |
e38f8a7a LR |
2184 | spin_lock_bh(®_pending_beacons_lock); |
2185 | if (!list_empty(®_pending_beacons)) { | |
2186 | list_for_each_entry_safe(reg_beacon, btmp, | |
2187 | ®_pending_beacons, list) { | |
2188 | list_del(®_beacon->list); | |
2189 | kfree(reg_beacon); | |
2190 | } | |
2191 | } | |
2192 | spin_unlock_bh(®_pending_beacons_lock); | |
2193 | ||
2194 | if (!list_empty(®_beacon_list)) { | |
2195 | list_for_each_entry_safe(reg_beacon, btmp, | |
2196 | ®_beacon_list, list) { | |
2197 | list_del(®_beacon->list); | |
2198 | kfree(reg_beacon); | |
2199 | } | |
2200 | } | |
2201 | ||
fe33eb39 LR |
2202 | spin_lock(®_requests_lock); |
2203 | if (!list_empty(®_requests_list)) { | |
2204 | list_for_each_entry_safe(reg_request, tmp, | |
2205 | ®_requests_list, list) { | |
2206 | list_del(®_request->list); | |
2207 | kfree(reg_request); | |
2208 | } | |
2209 | } | |
2210 | spin_unlock(®_requests_lock); | |
2211 | ||
a1794390 | 2212 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2213 | } |