Commit | Line | Data |
---|---|---|
8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
b2e1b302 | 5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
8318d78a JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
b2e1b302 LR |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
14 | * |
15 | * The usual implementation is for a driver to read a device EEPROM to | |
16 | * determine which regulatory domain it should be operating under, then | |
17 | * looking up the allowable channels in a driver-local table and finally | |
18 | * registering those channels in the wiphy structure. | |
19 | * | |
b2e1b302 LR |
20 | * Another set of compliance enforcement is for drivers to use their |
21 | * own compliance limits which can be stored on the EEPROM. The host | |
22 | * driver or firmware may ensure these are used. | |
23 | * | |
24 | * In addition to all this we provide an extra layer of regulatory | |
25 | * conformance. For drivers which do not have any regulatory | |
26 | * information CRDA provides the complete regulatory solution. | |
27 | * For others it provides a community effort on further restrictions | |
28 | * to enhance compliance. | |
29 | * | |
30 | * Note: When number of rules --> infinity we will not be able to | |
31 | * index on alpha2 any more, instead we'll probably have to | |
32 | * rely on some SHA1 checksum of the regdomain for example. | |
33 | * | |
8318d78a JB |
34 | */ |
35 | #include <linux/kernel.h> | |
b2e1b302 LR |
36 | #include <linux/list.h> |
37 | #include <linux/random.h> | |
38 | #include <linux/nl80211.h> | |
39 | #include <linux/platform_device.h> | |
b2e1b302 | 40 | #include <net/cfg80211.h> |
8318d78a | 41 | #include "core.h" |
b2e1b302 | 42 | #include "reg.h" |
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 | |
b2e1b302 LR |
51 | /* Keep the ordering from large to small */ |
52 | static u32 supported_bandwidths[] = { | |
53 | MHZ_TO_KHZ(40), | |
54 | MHZ_TO_KHZ(20), | |
8318d78a JB |
55 | }; |
56 | ||
fb1fc7ad LR |
57 | /* |
58 | * Central wireless core regulatory domains, we only need two, | |
734366de | 59 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
60 | * information to give us an alpha2 |
61 | */ | |
f130347c | 62 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 63 | |
fb1fc7ad LR |
64 | /* |
65 | * We use this as a place for the rd structure built from the | |
3f2355cb | 66 | * last parsed country IE to rest until CRDA gets back to us with |
fb1fc7ad LR |
67 | * what it thinks should apply for the same country |
68 | */ | |
3f2355cb LR |
69 | static const struct ieee80211_regdomain *country_ie_regdomain; |
70 | ||
e38f8a7a | 71 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
72 | static LIST_HEAD(reg_requests_list); |
73 | static spinlock_t reg_requests_lock; | |
74 | ||
e38f8a7a LR |
75 | /* Used to queue up beacon hints for review */ |
76 | static LIST_HEAD(reg_pending_beacons); | |
77 | static spinlock_t reg_pending_beacons_lock; | |
78 | ||
79 | /* Used to keep track of processed beacon hints */ | |
80 | static LIST_HEAD(reg_beacon_list); | |
81 | ||
82 | struct reg_beacon { | |
83 | struct list_head list; | |
84 | struct ieee80211_channel chan; | |
85 | }; | |
86 | ||
734366de JB |
87 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
88 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 89 | .n_reg_rules = 5, |
734366de JB |
90 | .alpha2 = "00", |
91 | .reg_rules = { | |
68798a62 LR |
92 | /* IEEE 802.11b/g, channels 1..11 */ |
93 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
94 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
95 | * channel fits here. */ | |
96 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
97 | NL80211_RRF_PASSIVE_SCAN | |
98 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
99 | /* IEEE 802.11 channel 14 - Only JP enables |
100 | * this and for 802.11b only */ | |
101 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
102 | NL80211_RRF_PASSIVE_SCAN | | |
103 | NL80211_RRF_NO_IBSS | | |
104 | NL80211_RRF_NO_OFDM), | |
105 | /* IEEE 802.11a, channel 36..48 */ | |
ec329ace | 106 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
107 | NL80211_RRF_PASSIVE_SCAN | |
108 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
109 | |
110 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
111 | ||
112 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 113 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
114 | NL80211_RRF_PASSIVE_SCAN | |
115 | NL80211_RRF_NO_IBSS), | |
734366de JB |
116 | } |
117 | }; | |
118 | ||
a3d2eaf0 JB |
119 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
120 | &world_regdom; | |
734366de JB |
121 | |
122 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
123 | static char *ieee80211_regdom = "US"; | |
6ee7d330 LR |
124 | #else |
125 | static char *ieee80211_regdom = "00"; | |
126 | #endif | |
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), | |
144 | /* IEEE 802.11a, channel 36 */ | |
145 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
146 | /* IEEE 802.11a, channel 40 */ | |
147 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
148 | /* IEEE 802.11a, channel 44 */ | |
149 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
150 | /* IEEE 802.11a, channels 48..64 */ | |
151 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
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 = { | |
158 | .n_reg_rules = 3, | |
159 | .alpha2 = "JP", | |
160 | .reg_rules = { | |
161 | /* IEEE 802.11b/g, channels 1..14 */ | |
162 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
163 | /* IEEE 802.11a, channels 34..48 */ | |
164 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
165 | NL80211_RRF_PASSIVE_SCAN), | |
166 | /* IEEE 802.11a, channels 52..64 */ | |
167 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
168 | NL80211_RRF_NO_IBSS | | |
169 | NL80211_RRF_DFS), | |
170 | } | |
171 | }; | |
172 | ||
173 | static const struct ieee80211_regdomain eu_regdom = { | |
174 | .n_reg_rules = 6, | |
fb1fc7ad LR |
175 | /* |
176 | * This alpha2 is bogus, we leave it here just for stupid | |
177 | * backward compatibility | |
178 | */ | |
734366de JB |
179 | .alpha2 = "EU", |
180 | .reg_rules = { | |
181 | /* IEEE 802.11b/g, channels 1..13 */ | |
182 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
183 | /* IEEE 802.11a, channel 36 */ | |
184 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
185 | NL80211_RRF_PASSIVE_SCAN), | |
186 | /* IEEE 802.11a, channel 40 */ | |
187 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
188 | NL80211_RRF_PASSIVE_SCAN), | |
189 | /* IEEE 802.11a, channel 44 */ | |
190 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
191 | NL80211_RRF_PASSIVE_SCAN), | |
192 | /* IEEE 802.11a, channels 48..64 */ | |
193 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
194 | NL80211_RRF_NO_IBSS | | |
195 | NL80211_RRF_DFS), | |
196 | /* IEEE 802.11a, channels 100..140 */ | |
197 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
198 | NL80211_RRF_NO_IBSS | | |
199 | NL80211_RRF_DFS), | |
200 | } | |
201 | }; | |
202 | ||
203 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
204 | { | |
205 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
206 | return &us_regdom; | |
207 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
208 | return &jp_regdom; | |
209 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
210 | return &eu_regdom; | |
211 | /* Default, as per the old rules */ | |
212 | return &us_regdom; | |
213 | } | |
214 | ||
a3d2eaf0 | 215 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
216 | { |
217 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
218 | return true; | |
219 | return false; | |
220 | } | |
942b25cf JB |
221 | #else |
222 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 223 | { |
942b25cf | 224 | return false; |
734366de | 225 | } |
942b25cf JB |
226 | #endif |
227 | ||
734366de JB |
228 | static void reset_regdomains(void) |
229 | { | |
942b25cf JB |
230 | /* avoid freeing static information or freeing something twice */ |
231 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
232 | cfg80211_regdomain = NULL; | |
233 | if (cfg80211_world_regdom == &world_regdom) | |
234 | cfg80211_world_regdom = NULL; | |
235 | if (cfg80211_regdomain == &world_regdom) | |
236 | cfg80211_regdomain = NULL; | |
237 | if (is_old_static_regdom(cfg80211_regdomain)) | |
238 | cfg80211_regdomain = NULL; | |
239 | ||
240 | kfree(cfg80211_regdomain); | |
241 | kfree(cfg80211_world_regdom); | |
734366de | 242 | |
a3d2eaf0 | 243 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
244 | cfg80211_regdomain = NULL; |
245 | } | |
246 | ||
fb1fc7ad LR |
247 | /* |
248 | * Dynamic world regulatory domain requested by the wireless | |
249 | * core upon initialization | |
250 | */ | |
a3d2eaf0 | 251 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 252 | { |
f6037d09 | 253 | BUG_ON(!last_request); |
734366de JB |
254 | |
255 | reset_regdomains(); | |
256 | ||
257 | cfg80211_world_regdom = rd; | |
258 | cfg80211_regdomain = rd; | |
259 | } | |
734366de | 260 | |
a3d2eaf0 | 261 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
262 | { |
263 | if (!alpha2) | |
264 | return false; | |
265 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
266 | return true; | |
267 | return false; | |
268 | } | |
8318d78a | 269 | |
a3d2eaf0 | 270 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
271 | { |
272 | if (!alpha2) | |
273 | return false; | |
274 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
275 | return true; | |
276 | return false; | |
277 | } | |
8318d78a | 278 | |
b2e1b302 LR |
279 | static bool is_alpha_upper(char letter) |
280 | { | |
281 | /* ASCII A - Z */ | |
282 | if (letter >= 65 && letter <= 90) | |
283 | return true; | |
284 | return false; | |
285 | } | |
8318d78a | 286 | |
a3d2eaf0 | 287 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
288 | { |
289 | if (!alpha2) | |
290 | return false; | |
fb1fc7ad LR |
291 | /* |
292 | * Special case where regulatory domain was built by driver | |
293 | * but a specific alpha2 cannot be determined | |
294 | */ | |
b2e1b302 LR |
295 | if (alpha2[0] == '9' && alpha2[1] == '9') |
296 | return true; | |
297 | return false; | |
298 | } | |
8318d78a | 299 | |
3f2355cb LR |
300 | static bool is_intersected_alpha2(const char *alpha2) |
301 | { | |
302 | if (!alpha2) | |
303 | return false; | |
fb1fc7ad LR |
304 | /* |
305 | * Special case where regulatory domain is the | |
3f2355cb | 306 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
307 | * structures |
308 | */ | |
3f2355cb LR |
309 | if (alpha2[0] == '9' && alpha2[1] == '8') |
310 | return true; | |
311 | return false; | |
312 | } | |
313 | ||
a3d2eaf0 | 314 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
315 | { |
316 | if (!alpha2) | |
317 | return false; | |
318 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
319 | return true; | |
320 | return false; | |
321 | } | |
8318d78a | 322 | |
a3d2eaf0 | 323 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
324 | { |
325 | if (!alpha2_x || !alpha2_y) | |
326 | return false; | |
327 | if (alpha2_x[0] == alpha2_y[0] && | |
328 | alpha2_x[1] == alpha2_y[1]) | |
329 | return true; | |
330 | return false; | |
331 | } | |
332 | ||
69b1572b | 333 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 334 | { |
761cf7ec LR |
335 | assert_cfg80211_lock(); |
336 | ||
b2e1b302 LR |
337 | if (!cfg80211_regdomain) |
338 | return true; | |
339 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
340 | return false; | |
341 | return true; | |
342 | } | |
343 | ||
3f2355cb LR |
344 | /** |
345 | * country_ie_integrity_changes - tells us if the country IE has changed | |
346 | * @checksum: checksum of country IE of fields we are interested in | |
347 | * | |
348 | * If the country IE has not changed you can ignore it safely. This is | |
349 | * useful to determine if two devices are seeing two different country IEs | |
350 | * even on the same alpha2. Note that this will return false if no IE has | |
351 | * been set on the wireless core yet. | |
352 | */ | |
353 | static bool country_ie_integrity_changes(u32 checksum) | |
354 | { | |
355 | /* If no IE has been set then the checksum doesn't change */ | |
356 | if (unlikely(!last_request->country_ie_checksum)) | |
357 | return false; | |
358 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
359 | return true; | |
360 | return false; | |
361 | } | |
362 | ||
fb1fc7ad LR |
363 | /* |
364 | * This lets us keep regulatory code which is updated on a regulatory | |
365 | * basis in userspace. | |
366 | */ | |
b2e1b302 LR |
367 | static int call_crda(const char *alpha2) |
368 | { | |
369 | char country_env[9 + 2] = "COUNTRY="; | |
370 | char *envp[] = { | |
371 | country_env, | |
372 | NULL | |
373 | }; | |
374 | ||
375 | if (!is_world_regdom((char *) alpha2)) | |
376 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
377 | alpha2[0], alpha2[1]); | |
378 | else | |
b2e1b302 LR |
379 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
380 | "regulatory domain\n"); | |
b2e1b302 LR |
381 | |
382 | country_env[8] = alpha2[0]; | |
383 | country_env[9] = alpha2[1]; | |
384 | ||
385 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
386 | } | |
387 | ||
b2e1b302 | 388 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 389 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 390 | { |
f6037d09 JB |
391 | if (!last_request) |
392 | return false; | |
393 | ||
394 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 395 | } |
8318d78a | 396 | |
b2e1b302 | 397 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 398 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 399 | { |
a3d2eaf0 | 400 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
401 | u32 freq_diff; |
402 | ||
91e99004 | 403 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
404 | return false; |
405 | ||
406 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
407 | return false; | |
408 | ||
409 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
410 | ||
bd05f28e RK |
411 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
412 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
413 | return false; |
414 | ||
415 | return true; | |
416 | } | |
417 | ||
a3d2eaf0 | 418 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 419 | { |
a3d2eaf0 | 420 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 421 | unsigned int i; |
8318d78a | 422 | |
b2e1b302 LR |
423 | if (!rd->n_reg_rules) |
424 | return false; | |
8318d78a | 425 | |
88dc1c3f LR |
426 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
427 | return false; | |
428 | ||
b2e1b302 LR |
429 | for (i = 0; i < rd->n_reg_rules; i++) { |
430 | reg_rule = &rd->reg_rules[i]; | |
431 | if (!is_valid_reg_rule(reg_rule)) | |
432 | return false; | |
433 | } | |
434 | ||
435 | return true; | |
8318d78a JB |
436 | } |
437 | ||
b2e1b302 LR |
438 | /* Returns value in KHz */ |
439 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
440 | u32 freq) | |
441 | { | |
442 | unsigned int i; | |
443 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
444 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
445 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
446 | if (start_freq_khz >= freq_range->start_freq_khz && | |
447 | end_freq_khz <= freq_range->end_freq_khz) | |
448 | return supported_bandwidths[i]; | |
449 | } | |
450 | return 0; | |
451 | } | |
8318d78a | 452 | |
0c7dc45d LR |
453 | /** |
454 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
455 | * @freq_range: frequency rule we want to query | |
456 | * @freq_khz: frequency we are inquiring about | |
457 | * | |
458 | * This lets us know if a specific frequency rule is or is not relevant to | |
459 | * a specific frequency's band. Bands are device specific and artificial | |
460 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
461 | * safe for now to assume that a frequency rule should not be part of a | |
462 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
463 | * This resolution can be lowered and should be considered as we add | |
464 | * regulatory rule support for other "bands". | |
465 | **/ | |
466 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
467 | u32 freq_khz) | |
468 | { | |
469 | #define ONE_GHZ_IN_KHZ 1000000 | |
470 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
471 | return true; | |
472 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
473 | return true; | |
474 | return false; | |
475 | #undef ONE_GHZ_IN_KHZ | |
476 | } | |
477 | ||
fb1fc7ad LR |
478 | /* |
479 | * Converts a country IE to a regulatory domain. A regulatory domain | |
3f2355cb LR |
480 | * structure has a lot of information which the IE doesn't yet have, |
481 | * so for the other values we use upper max values as we will intersect | |
fb1fc7ad LR |
482 | * with our userspace regulatory agent to get lower bounds. |
483 | */ | |
3f2355cb LR |
484 | static struct ieee80211_regdomain *country_ie_2_rd( |
485 | u8 *country_ie, | |
486 | u8 country_ie_len, | |
487 | u32 *checksum) | |
488 | { | |
489 | struct ieee80211_regdomain *rd = NULL; | |
490 | unsigned int i = 0; | |
491 | char alpha2[2]; | |
492 | u32 flags = 0; | |
493 | u32 num_rules = 0, size_of_regd = 0; | |
494 | u8 *triplets_start = NULL; | |
495 | u8 len_at_triplet = 0; | |
496 | /* the last channel we have registered in a subband (triplet) */ | |
497 | int last_sub_max_channel = 0; | |
498 | ||
499 | *checksum = 0xDEADBEEF; | |
500 | ||
501 | /* Country IE requirements */ | |
502 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
503 | country_ie_len & 0x01); | |
504 | ||
505 | alpha2[0] = country_ie[0]; | |
506 | alpha2[1] = country_ie[1]; | |
507 | ||
508 | /* | |
509 | * Third octet can be: | |
510 | * 'I' - Indoor | |
511 | * 'O' - Outdoor | |
512 | * | |
513 | * anything else we assume is no restrictions | |
514 | */ | |
515 | if (country_ie[2] == 'I') | |
516 | flags = NL80211_RRF_NO_OUTDOOR; | |
517 | else if (country_ie[2] == 'O') | |
518 | flags = NL80211_RRF_NO_INDOOR; | |
519 | ||
520 | country_ie += 3; | |
521 | country_ie_len -= 3; | |
522 | ||
523 | triplets_start = country_ie; | |
524 | len_at_triplet = country_ie_len; | |
525 | ||
526 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
527 | ||
fb1fc7ad LR |
528 | /* |
529 | * We need to build a reg rule for each triplet, but first we must | |
3f2355cb | 530 | * calculate the number of reg rules we will need. We will need one |
fb1fc7ad LR |
531 | * for each channel subband |
532 | */ | |
3f2355cb | 533 | while (country_ie_len >= 3) { |
615aab4b | 534 | int end_channel = 0; |
3f2355cb LR |
535 | struct ieee80211_country_ie_triplet *triplet = |
536 | (struct ieee80211_country_ie_triplet *) country_ie; | |
537 | int cur_sub_max_channel = 0, cur_channel = 0; | |
538 | ||
539 | if (triplet->ext.reg_extension_id >= | |
540 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
541 | country_ie += 3; | |
542 | country_ie_len -= 3; | |
543 | continue; | |
544 | } | |
545 | ||
615aab4b LR |
546 | /* 2 GHz */ |
547 | if (triplet->chans.first_channel <= 14) | |
548 | end_channel = triplet->chans.first_channel + | |
549 | triplet->chans.num_channels; | |
550 | else | |
551 | /* | |
552 | * 5 GHz -- For example in country IEs if the first | |
553 | * channel given is 36 and the number of channels is 4 | |
554 | * then the individual channel numbers defined for the | |
555 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
556 | * and not 36, 37, 38, 39. | |
557 | * | |
558 | * See: http://tinyurl.com/11d-clarification | |
559 | */ | |
560 | end_channel = triplet->chans.first_channel + | |
561 | (4 * (triplet->chans.num_channels - 1)); | |
562 | ||
3f2355cb | 563 | cur_channel = triplet->chans.first_channel; |
615aab4b | 564 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
565 | |
566 | /* Basic sanity check */ | |
567 | if (cur_sub_max_channel < cur_channel) | |
568 | return NULL; | |
569 | ||
fb1fc7ad LR |
570 | /* |
571 | * Do not allow overlapping channels. Also channels | |
3f2355cb | 572 | * passed in each subband must be monotonically |
fb1fc7ad LR |
573 | * increasing |
574 | */ | |
3f2355cb LR |
575 | if (last_sub_max_channel) { |
576 | if (cur_channel <= last_sub_max_channel) | |
577 | return NULL; | |
578 | if (cur_sub_max_channel <= last_sub_max_channel) | |
579 | return NULL; | |
580 | } | |
581 | ||
fb1fc7ad LR |
582 | /* |
583 | * When dot11RegulatoryClassesRequired is supported | |
3f2355cb LR |
584 | * we can throw ext triplets as part of this soup, |
585 | * for now we don't care when those change as we | |
fb1fc7ad LR |
586 | * don't support them |
587 | */ | |
3f2355cb LR |
588 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | |
589 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
590 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
591 | ||
592 | last_sub_max_channel = cur_sub_max_channel; | |
593 | ||
594 | country_ie += 3; | |
595 | country_ie_len -= 3; | |
596 | num_rules++; | |
597 | ||
fb1fc7ad LR |
598 | /* |
599 | * Note: this is not a IEEE requirement but | |
600 | * simply a memory requirement | |
601 | */ | |
3f2355cb LR |
602 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) |
603 | return NULL; | |
604 | } | |
605 | ||
606 | country_ie = triplets_start; | |
607 | country_ie_len = len_at_triplet; | |
608 | ||
609 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
610 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
611 | ||
612 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
613 | if (!rd) | |
614 | return NULL; | |
615 | ||
616 | rd->n_reg_rules = num_rules; | |
617 | rd->alpha2[0] = alpha2[0]; | |
618 | rd->alpha2[1] = alpha2[1]; | |
619 | ||
620 | /* This time around we fill in the rd */ | |
621 | while (country_ie_len >= 3) { | |
02e68a3d | 622 | int end_channel = 0; |
3f2355cb LR |
623 | struct ieee80211_country_ie_triplet *triplet = |
624 | (struct ieee80211_country_ie_triplet *) country_ie; | |
625 | struct ieee80211_reg_rule *reg_rule = NULL; | |
626 | struct ieee80211_freq_range *freq_range = NULL; | |
627 | struct ieee80211_power_rule *power_rule = NULL; | |
628 | ||
fb1fc7ad LR |
629 | /* |
630 | * Must parse if dot11RegulatoryClassesRequired is true, | |
631 | * we don't support this yet | |
632 | */ | |
3f2355cb LR |
633 | if (triplet->ext.reg_extension_id >= |
634 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
635 | country_ie += 3; | |
636 | country_ie_len -= 3; | |
637 | continue; | |
638 | } | |
639 | ||
640 | reg_rule = &rd->reg_rules[i]; | |
641 | freq_range = ®_rule->freq_range; | |
642 | power_rule = ®_rule->power_rule; | |
643 | ||
644 | reg_rule->flags = flags; | |
645 | ||
02e68a3d LR |
646 | /* 2 GHz */ |
647 | if (triplet->chans.first_channel <= 14) | |
648 | end_channel = triplet->chans.first_channel + | |
649 | triplet->chans.num_channels; | |
650 | else | |
02e68a3d LR |
651 | end_channel = triplet->chans.first_channel + |
652 | (4 * (triplet->chans.num_channels - 1)); | |
653 | ||
fb1fc7ad LR |
654 | /* |
655 | * The +10 is since the regulatory domain expects | |
3f2355cb LR |
656 | * the actual band edge, not the center of freq for |
657 | * its start and end freqs, assuming 20 MHz bandwidth on | |
fb1fc7ad LR |
658 | * the channels passed |
659 | */ | |
3f2355cb LR |
660 | freq_range->start_freq_khz = |
661 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
662 | triplet->chans.first_channel) - 10); | |
663 | freq_range->end_freq_khz = | |
664 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 665 | end_channel) + 10); |
3f2355cb | 666 | |
fb1fc7ad LR |
667 | /* |
668 | * These are large arbitrary values we use to intersect later. | |
669 | * Increment this if we ever support >= 40 MHz channels | |
670 | * in IEEE 802.11 | |
671 | */ | |
3f2355cb LR |
672 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); |
673 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
674 | power_rule->max_eirp = DBM_TO_MBM(100); | |
675 | ||
676 | country_ie += 3; | |
677 | country_ie_len -= 3; | |
678 | i++; | |
679 | ||
680 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
681 | } | |
682 | ||
683 | return rd; | |
684 | } | |
685 | ||
686 | ||
fb1fc7ad LR |
687 | /* |
688 | * Helper for regdom_intersect(), this does the real | |
689 | * mathematical intersection fun | |
690 | */ | |
9c96477d LR |
691 | static int reg_rules_intersect( |
692 | const struct ieee80211_reg_rule *rule1, | |
693 | const struct ieee80211_reg_rule *rule2, | |
694 | struct ieee80211_reg_rule *intersected_rule) | |
695 | { | |
696 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
697 | struct ieee80211_freq_range *freq_range; | |
698 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
699 | struct ieee80211_power_rule *power_rule; | |
700 | u32 freq_diff; | |
701 | ||
702 | freq_range1 = &rule1->freq_range; | |
703 | freq_range2 = &rule2->freq_range; | |
704 | freq_range = &intersected_rule->freq_range; | |
705 | ||
706 | power_rule1 = &rule1->power_rule; | |
707 | power_rule2 = &rule2->power_rule; | |
708 | power_rule = &intersected_rule->power_rule; | |
709 | ||
710 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
711 | freq_range2->start_freq_khz); | |
712 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
713 | freq_range2->end_freq_khz); | |
714 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
715 | freq_range2->max_bandwidth_khz); | |
716 | ||
717 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
718 | if (freq_range->max_bandwidth_khz > freq_diff) | |
719 | freq_range->max_bandwidth_khz = freq_diff; | |
720 | ||
721 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
722 | power_rule2->max_eirp); | |
723 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
724 | power_rule2->max_antenna_gain); | |
725 | ||
726 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
727 | ||
728 | if (!is_valid_reg_rule(intersected_rule)) | |
729 | return -EINVAL; | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | /** | |
735 | * regdom_intersect - do the intersection between two regulatory domains | |
736 | * @rd1: first regulatory domain | |
737 | * @rd2: second regulatory domain | |
738 | * | |
739 | * Use this function to get the intersection between two regulatory domains. | |
740 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
741 | * as no one single alpha2 can represent this regulatory domain. | |
742 | * | |
743 | * Returns a pointer to the regulatory domain structure which will hold the | |
744 | * resulting intersection of rules between rd1 and rd2. We will | |
745 | * kzalloc() this structure for you. | |
746 | */ | |
747 | static struct ieee80211_regdomain *regdom_intersect( | |
748 | const struct ieee80211_regdomain *rd1, | |
749 | const struct ieee80211_regdomain *rd2) | |
750 | { | |
751 | int r, size_of_regd; | |
752 | unsigned int x, y; | |
753 | unsigned int num_rules = 0, rule_idx = 0; | |
754 | const struct ieee80211_reg_rule *rule1, *rule2; | |
755 | struct ieee80211_reg_rule *intersected_rule; | |
756 | struct ieee80211_regdomain *rd; | |
757 | /* This is just a dummy holder to help us count */ | |
758 | struct ieee80211_reg_rule irule; | |
759 | ||
760 | /* Uses the stack temporarily for counter arithmetic */ | |
761 | intersected_rule = &irule; | |
762 | ||
763 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
764 | ||
765 | if (!rd1 || !rd2) | |
766 | return NULL; | |
767 | ||
fb1fc7ad LR |
768 | /* |
769 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
770 | * build them. This is to so we can malloc() and free() a |
771 | * regdomain once. The reason we use reg_rules_intersect() here | |
772 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
773 | * All rules that do check out OK are valid. |
774 | */ | |
9c96477d LR |
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]; | |
780 | if (!reg_rules_intersect(rule1, rule2, | |
781 | intersected_rule)) | |
782 | num_rules++; | |
783 | memset(intersected_rule, 0, | |
784 | sizeof(struct ieee80211_reg_rule)); | |
785 | } | |
786 | } | |
787 | ||
788 | if (!num_rules) | |
789 | return NULL; | |
790 | ||
791 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
792 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
793 | ||
794 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
795 | if (!rd) | |
796 | return NULL; | |
797 | ||
798 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
799 | rule1 = &rd1->reg_rules[x]; | |
800 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
801 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
802 | /* |
803 | * This time around instead of using the stack lets | |
9c96477d | 804 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
805 | * a memcpy() |
806 | */ | |
9c96477d LR |
807 | intersected_rule = &rd->reg_rules[rule_idx]; |
808 | r = reg_rules_intersect(rule1, rule2, | |
809 | intersected_rule); | |
fb1fc7ad LR |
810 | /* |
811 | * No need to memset here the intersected rule here as | |
812 | * we're not using the stack anymore | |
813 | */ | |
9c96477d LR |
814 | if (r) |
815 | continue; | |
816 | rule_idx++; | |
817 | } | |
818 | } | |
819 | ||
820 | if (rule_idx != num_rules) { | |
821 | kfree(rd); | |
822 | return NULL; | |
823 | } | |
824 | ||
825 | rd->n_reg_rules = num_rules; | |
826 | rd->alpha2[0] = '9'; | |
827 | rd->alpha2[1] = '8'; | |
828 | ||
829 | return rd; | |
830 | } | |
831 | ||
fb1fc7ad LR |
832 | /* |
833 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
834 | * want to just have the channel structure use these | |
835 | */ | |
b2e1b302 LR |
836 | static u32 map_regdom_flags(u32 rd_flags) |
837 | { | |
838 | u32 channel_flags = 0; | |
839 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
840 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
841 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
842 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
843 | if (rd_flags & NL80211_RRF_DFS) | |
844 | channel_flags |= IEEE80211_CHAN_RADAR; | |
845 | return channel_flags; | |
846 | } | |
847 | ||
1fa25e41 LR |
848 | static int freq_reg_info_regd(struct wiphy *wiphy, |
849 | u32 center_freq, | |
850 | u32 *bandwidth, | |
851 | const struct ieee80211_reg_rule **reg_rule, | |
852 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
853 | { |
854 | int i; | |
0c7dc45d | 855 | bool band_rule_found = false; |
3e0c3ff3 | 856 | const struct ieee80211_regdomain *regd; |
b2e1b302 | 857 | u32 max_bandwidth = 0; |
8318d78a | 858 | |
1fa25e41 | 859 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 860 | |
fb1fc7ad LR |
861 | /* |
862 | * Follow the driver's regulatory domain, if present, unless a country | |
863 | * IE has been processed or a user wants to help complaince further | |
864 | */ | |
7db90f4a LR |
865 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
866 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && | |
3e0c3ff3 LR |
867 | wiphy->regd) |
868 | regd = wiphy->regd; | |
869 | ||
870 | if (!regd) | |
b2e1b302 LR |
871 | return -EINVAL; |
872 | ||
3e0c3ff3 | 873 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
874 | const struct ieee80211_reg_rule *rr; |
875 | const struct ieee80211_freq_range *fr = NULL; | |
876 | const struct ieee80211_power_rule *pr = NULL; | |
877 | ||
3e0c3ff3 | 878 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
879 | fr = &rr->freq_range; |
880 | pr = &rr->power_rule; | |
0c7dc45d | 881 | |
fb1fc7ad LR |
882 | /* |
883 | * We only need to know if one frequency rule was | |
0c7dc45d | 884 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
885 | * not overwrite it once found |
886 | */ | |
0c7dc45d LR |
887 | if (!band_rule_found) |
888 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
889 | ||
b2e1b302 | 890 | max_bandwidth = freq_max_bandwidth(fr, center_freq); |
0c7dc45d | 891 | |
b2e1b302 LR |
892 | if (max_bandwidth && *bandwidth <= max_bandwidth) { |
893 | *reg_rule = rr; | |
894 | *bandwidth = max_bandwidth; | |
8318d78a JB |
895 | break; |
896 | } | |
897 | } | |
898 | ||
0c7dc45d LR |
899 | if (!band_rule_found) |
900 | return -ERANGE; | |
901 | ||
b2e1b302 LR |
902 | return !max_bandwidth; |
903 | } | |
34f57347 | 904 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 905 | |
34f57347 | 906 | int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth, |
1fa25e41 LR |
907 | const struct ieee80211_reg_rule **reg_rule) |
908 | { | |
ac46d48e | 909 | assert_cfg80211_lock(); |
1fa25e41 LR |
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 | { | |
e38f8a7a LR |
1052 | struct ieee80211_supported_band *sband; |
1053 | struct ieee80211_channel *chan; | |
6bad8766 LR |
1054 | bool channel_changed = false; |
1055 | struct ieee80211_channel chan_before; | |
e38f8a7a LR |
1056 | |
1057 | assert_cfg80211_lock(); | |
1058 | ||
1059 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1060 | chan = &sband->channels[chan_idx]; | |
1061 | ||
1062 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
1063 | return; | |
1064 | ||
6bad8766 LR |
1065 | if (chan->beacon_found) |
1066 | return; | |
1067 | ||
1068 | chan->beacon_found = true; | |
1069 | ||
1070 | chan_before.center_freq = chan->center_freq; | |
1071 | chan_before.flags = chan->flags; | |
1072 | ||
a4ed90d6 LR |
1073 | if ((chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) && |
1074 | !(chan->orig_flags & IEEE80211_CHAN_PASSIVE_SCAN)) { | |
e38f8a7a | 1075 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; |
6bad8766 | 1076 | channel_changed = true; |
e38f8a7a LR |
1077 | } |
1078 | ||
a4ed90d6 LR |
1079 | if ((chan->flags & IEEE80211_CHAN_NO_IBSS) && |
1080 | !(chan->orig_flags & IEEE80211_CHAN_NO_IBSS)) { | |
e38f8a7a | 1081 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; |
6bad8766 | 1082 | channel_changed = true; |
e38f8a7a LR |
1083 | } |
1084 | ||
6bad8766 LR |
1085 | if (channel_changed) |
1086 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
e38f8a7a LR |
1087 | } |
1088 | ||
1089 | /* | |
1090 | * Called when a scan on a wiphy finds a beacon on | |
1091 | * new channel | |
1092 | */ | |
1093 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
1094 | struct reg_beacon *reg_beacon) | |
1095 | { | |
1096 | unsigned int i; | |
1097 | struct ieee80211_supported_band *sband; | |
1098 | ||
1099 | assert_cfg80211_lock(); | |
1100 | ||
1101 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1102 | return; | |
1103 | ||
1104 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1105 | ||
1106 | for (i = 0; i < sband->n_channels; i++) | |
1107 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * Called upon reg changes or a new wiphy is added | |
1112 | */ | |
1113 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1114 | { | |
1115 | unsigned int i; | |
1116 | struct ieee80211_supported_band *sband; | |
1117 | struct reg_beacon *reg_beacon; | |
1118 | ||
1119 | assert_cfg80211_lock(); | |
1120 | ||
1121 | if (list_empty(®_beacon_list)) | |
1122 | return; | |
1123 | ||
1124 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1125 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1126 | continue; | |
1127 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1128 | for (i = 0; i < sband->n_channels; i++) | |
1129 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1134 | { | |
1135 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1136 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1137 | return true; | |
b1ed8ddd LR |
1138 | if (last_request && |
1139 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
e38f8a7a LR |
1140 | wiphy->custom_regulatory) |
1141 | return true; | |
1142 | return false; | |
1143 | } | |
1144 | ||
1145 | /* Reap the advantages of previously found beacons */ | |
1146 | static void reg_process_beacons(struct wiphy *wiphy) | |
1147 | { | |
b1ed8ddd LR |
1148 | /* |
1149 | * Means we are just firing up cfg80211, so no beacons would | |
1150 | * have been processed yet. | |
1151 | */ | |
1152 | if (!last_request) | |
1153 | return; | |
e38f8a7a LR |
1154 | if (!reg_is_world_roaming(wiphy)) |
1155 | return; | |
1156 | wiphy_update_beacon_reg(wiphy); | |
1157 | } | |
1158 | ||
7db90f4a LR |
1159 | void wiphy_update_regulatory(struct wiphy *wiphy, |
1160 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1161 | { |
1162 | enum ieee80211_band band; | |
d46e5b1d | 1163 | |
7db90f4a | 1164 | if (ignore_reg_update(wiphy, initiator)) |
e38f8a7a | 1165 | goto out; |
b2e1b302 | 1166 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1167 | if (wiphy->bands[band]) |
a92a3ce7 | 1168 | handle_band(wiphy, band); |
b2e1b302 | 1169 | } |
e38f8a7a LR |
1170 | out: |
1171 | reg_process_beacons(wiphy); | |
560e28e1 | 1172 | if (wiphy->reg_notifier) |
716f9392 | 1173 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1174 | } |
1175 | ||
1fa25e41 LR |
1176 | static void handle_channel_custom(struct wiphy *wiphy, |
1177 | enum ieee80211_band band, | |
1178 | unsigned int chan_idx, | |
1179 | const struct ieee80211_regdomain *regd) | |
1180 | { | |
1181 | int r; | |
1182 | u32 max_bandwidth = 0; | |
1183 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1184 | const struct ieee80211_power_rule *power_rule = NULL; | |
1185 | struct ieee80211_supported_band *sband; | |
1186 | struct ieee80211_channel *chan; | |
1187 | ||
ac46d48e LR |
1188 | assert_cfg80211_lock(); |
1189 | ||
1fa25e41 LR |
1190 | sband = wiphy->bands[band]; |
1191 | BUG_ON(chan_idx >= sband->n_channels); | |
1192 | chan = &sband->channels[chan_idx]; | |
1193 | ||
1194 | r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq), | |
1195 | &max_bandwidth, ®_rule, regd); | |
1196 | ||
1197 | if (r) { | |
1198 | chan->flags = IEEE80211_CHAN_DISABLED; | |
1199 | return; | |
1200 | } | |
1201 | ||
1202 | power_rule = ®_rule->power_rule; | |
1203 | ||
1204 | chan->flags |= map_regdom_flags(reg_rule->flags); | |
1205 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
1206 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
1207 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
1208 | } | |
1209 | ||
1210 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1211 | const struct ieee80211_regdomain *regd) | |
1212 | { | |
1213 | unsigned int i; | |
1214 | struct ieee80211_supported_band *sband; | |
1215 | ||
1216 | BUG_ON(!wiphy->bands[band]); | |
1217 | sband = wiphy->bands[band]; | |
1218 | ||
1219 | for (i = 0; i < sband->n_channels; i++) | |
1220 | handle_channel_custom(wiphy, band, i, regd); | |
1221 | } | |
1222 | ||
1223 | /* Used by drivers prior to wiphy registration */ | |
1224 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1225 | const struct ieee80211_regdomain *regd) | |
1226 | { | |
1227 | enum ieee80211_band band; | |
ac46d48e LR |
1228 | |
1229 | mutex_lock(&cfg80211_mutex); | |
1fa25e41 LR |
1230 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
1231 | if (wiphy->bands[band]) | |
1232 | handle_band_custom(wiphy, band, regd); | |
b2e1b302 | 1233 | } |
ac46d48e | 1234 | mutex_unlock(&cfg80211_mutex); |
b2e1b302 | 1235 | } |
1fa25e41 LR |
1236 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1237 | ||
3e0c3ff3 LR |
1238 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
1239 | const struct ieee80211_regdomain *src_regd) | |
1240 | { | |
1241 | struct ieee80211_regdomain *regd; | |
1242 | int size_of_regd = 0; | |
1243 | unsigned int i; | |
1244 | ||
1245 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1246 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
1247 | ||
1248 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
1249 | if (!regd) | |
1250 | return -ENOMEM; | |
1251 | ||
1252 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
1253 | ||
1254 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
1255 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
1256 | sizeof(struct ieee80211_reg_rule)); | |
1257 | ||
1258 | *dst_regd = regd; | |
1259 | return 0; | |
1260 | } | |
b2e1b302 | 1261 | |
fb1fc7ad LR |
1262 | /* |
1263 | * Return value which can be used by ignore_request() to indicate | |
1264 | * it has been determined we should intersect two regulatory domains | |
1265 | */ | |
9c96477d LR |
1266 | #define REG_INTERSECT 1 |
1267 | ||
84fa4f43 JB |
1268 | /* This has the logic which determines when a new request |
1269 | * should be ignored. */ | |
2f92cd2e LR |
1270 | static int ignore_request(struct wiphy *wiphy, |
1271 | struct regulatory_request *pending_request) | |
84fa4f43 | 1272 | { |
806a9e39 | 1273 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1274 | |
1275 | assert_cfg80211_lock(); | |
1276 | ||
84fa4f43 JB |
1277 | /* All initial requests are respected */ |
1278 | if (!last_request) | |
1279 | return 0; | |
1280 | ||
2f92cd2e | 1281 | switch (pending_request->initiator) { |
7db90f4a | 1282 | case NL80211_REGDOM_SET_BY_CORE: |
ba25c141 | 1283 | return -EINVAL; |
7db90f4a | 1284 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1285 | |
1286 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1287 | ||
2f92cd2e | 1288 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1289 | return -EINVAL; |
7db90f4a LR |
1290 | if (last_request->initiator == |
1291 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1292 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1293 | /* |
1294 | * Two cards with two APs claiming different | |
1295 | * different Country IE alpha2s. We could | |
1296 | * intersect them, but that seems unlikely | |
1297 | * to be correct. Reject second one for now. | |
1298 | */ | |
2f92cd2e | 1299 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1300 | return -EOPNOTSUPP; |
1301 | return -EALREADY; | |
1302 | } | |
fb1fc7ad LR |
1303 | /* |
1304 | * Two consecutive Country IE hints on the same wiphy. | |
1305 | * This should be picked up early by the driver/stack | |
1306 | */ | |
2f92cd2e | 1307 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1308 | return 0; |
1309 | return -EALREADY; | |
1310 | } | |
3f2355cb | 1311 | return REG_INTERSECT; |
7db90f4a LR |
1312 | case NL80211_REGDOM_SET_BY_DRIVER: |
1313 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
e74b1e7f LR |
1314 | if (is_old_static_regdom(cfg80211_regdomain)) |
1315 | return 0; | |
2f92cd2e | 1316 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1317 | return 0; |
84fa4f43 | 1318 | return -EALREADY; |
e74b1e7f | 1319 | } |
fff32c04 LR |
1320 | |
1321 | /* | |
1322 | * This would happen if you unplug and plug your card | |
1323 | * back in or if you add a new device for which the previously | |
1324 | * loaded card also agrees on the regulatory domain. | |
1325 | */ | |
7db90f4a | 1326 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1327 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1328 | return -EALREADY; |
1329 | ||
3e0c3ff3 | 1330 | return REG_INTERSECT; |
7db90f4a LR |
1331 | case NL80211_REGDOM_SET_BY_USER: |
1332 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1333 | return REG_INTERSECT; |
fb1fc7ad LR |
1334 | /* |
1335 | * If the user knows better the user should set the regdom | |
1336 | * to their country before the IE is picked up | |
1337 | */ | |
7db90f4a | 1338 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1339 | last_request->intersect) |
1340 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1341 | /* |
1342 | * Process user requests only after previous user/driver/core | |
1343 | * requests have been processed | |
1344 | */ | |
7db90f4a LR |
1345 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1346 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1347 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
69b1572b | 1348 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1349 | return -EAGAIN; |
1350 | } | |
1351 | ||
e74b1e7f | 1352 | if (!is_old_static_regdom(cfg80211_regdomain) && |
2f92cd2e | 1353 | !regdom_changes(pending_request->alpha2)) |
e74b1e7f LR |
1354 | return -EALREADY; |
1355 | ||
84fa4f43 JB |
1356 | return 0; |
1357 | } | |
1358 | ||
1359 | return -EINVAL; | |
1360 | } | |
1361 | ||
d1c96a9a LR |
1362 | /** |
1363 | * __regulatory_hint - hint to the wireless core a regulatory domain | |
1364 | * @wiphy: if the hint comes from country information from an AP, this | |
1365 | * is required to be set to the wiphy that received the information | |
28da32d7 | 1366 | * @pending_request: the regulatory request currently being processed |
d1c96a9a LR |
1367 | * |
1368 | * The Wireless subsystem can use this function to hint to the wireless core | |
28da32d7 | 1369 | * what it believes should be the current regulatory domain. |
d1c96a9a LR |
1370 | * |
1371 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1372 | * already been set or other standard error codes. | |
1373 | * | |
1374 | * Caller must hold &cfg80211_mutex | |
1375 | */ | |
28da32d7 LR |
1376 | static int __regulatory_hint(struct wiphy *wiphy, |
1377 | struct regulatory_request *pending_request) | |
b2e1b302 | 1378 | { |
9c96477d | 1379 | bool intersect = false; |
b2e1b302 LR |
1380 | int r = 0; |
1381 | ||
761cf7ec LR |
1382 | assert_cfg80211_lock(); |
1383 | ||
2f92cd2e | 1384 | r = ignore_request(wiphy, pending_request); |
9c96477d | 1385 | |
3e0c3ff3 | 1386 | if (r == REG_INTERSECT) { |
7db90f4a LR |
1387 | if (pending_request->initiator == |
1388 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1389 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1390 | if (r) { |
1391 | kfree(pending_request); | |
3e0c3ff3 | 1392 | return r; |
d951c1dd | 1393 | } |
3e0c3ff3 | 1394 | } |
9c96477d | 1395 | intersect = true; |
3e0c3ff3 | 1396 | } else if (r) { |
fb1fc7ad LR |
1397 | /* |
1398 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1399 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1400 | * wiphy |
1401 | */ | |
28da32d7 | 1402 | if (r == -EALREADY && |
7db90f4a LR |
1403 | pending_request->initiator == |
1404 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1405 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1406 | if (r) { |
1407 | kfree(pending_request); | |
3e0c3ff3 | 1408 | return r; |
d951c1dd | 1409 | } |
3e0c3ff3 LR |
1410 | r = -EALREADY; |
1411 | goto new_request; | |
1412 | } | |
d951c1dd | 1413 | kfree(pending_request); |
b2e1b302 | 1414 | return r; |
3e0c3ff3 | 1415 | } |
b2e1b302 | 1416 | |
3e0c3ff3 | 1417 | new_request: |
d951c1dd | 1418 | kfree(last_request); |
5203cdb6 | 1419 | |
d951c1dd LR |
1420 | last_request = pending_request; |
1421 | last_request->intersect = intersect; | |
5203cdb6 | 1422 | |
d951c1dd | 1423 | pending_request = NULL; |
3e0c3ff3 LR |
1424 | |
1425 | /* When r == REG_INTERSECT we do need to call CRDA */ | |
73d54c9e LR |
1426 | if (r < 0) { |
1427 | /* | |
1428 | * Since CRDA will not be called in this case as we already | |
1429 | * have applied the requested regulatory domain before we just | |
1430 | * inform userspace we have processed the request | |
1431 | */ | |
1432 | if (r == -EALREADY) | |
1433 | nl80211_send_reg_change_event(last_request); | |
3e0c3ff3 | 1434 | return r; |
73d54c9e | 1435 | } |
3e0c3ff3 | 1436 | |
d951c1dd | 1437 | return call_crda(last_request->alpha2); |
b2e1b302 LR |
1438 | } |
1439 | ||
30a548c7 | 1440 | /* This processes *all* regulatory hints */ |
d951c1dd | 1441 | static void reg_process_hint(struct regulatory_request *reg_request) |
fe33eb39 LR |
1442 | { |
1443 | int r = 0; | |
1444 | struct wiphy *wiphy = NULL; | |
1445 | ||
1446 | BUG_ON(!reg_request->alpha2); | |
1447 | ||
1448 | mutex_lock(&cfg80211_mutex); | |
1449 | ||
1450 | if (wiphy_idx_valid(reg_request->wiphy_idx)) | |
1451 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1452 | ||
7db90f4a | 1453 | if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
fe33eb39 | 1454 | !wiphy) { |
d951c1dd | 1455 | kfree(reg_request); |
fe33eb39 LR |
1456 | goto out; |
1457 | } | |
1458 | ||
28da32d7 | 1459 | r = __regulatory_hint(wiphy, reg_request); |
fe33eb39 LR |
1460 | /* This is required so that the orig_* parameters are saved */ |
1461 | if (r == -EALREADY && wiphy && wiphy->strict_regulatory) | |
1462 | wiphy_update_regulatory(wiphy, reg_request->initiator); | |
1463 | out: | |
1464 | mutex_unlock(&cfg80211_mutex); | |
fe33eb39 LR |
1465 | } |
1466 | ||
7db90f4a | 1467 | /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */ |
fe33eb39 LR |
1468 | static void reg_process_pending_hints(void) |
1469 | { | |
1470 | struct regulatory_request *reg_request; | |
fe33eb39 LR |
1471 | |
1472 | spin_lock(®_requests_lock); | |
1473 | while (!list_empty(®_requests_list)) { | |
1474 | reg_request = list_first_entry(®_requests_list, | |
1475 | struct regulatory_request, | |
1476 | list); | |
1477 | list_del_init(®_request->list); | |
fe33eb39 | 1478 | |
d951c1dd LR |
1479 | spin_unlock(®_requests_lock); |
1480 | reg_process_hint(reg_request); | |
fe33eb39 LR |
1481 | spin_lock(®_requests_lock); |
1482 | } | |
1483 | spin_unlock(®_requests_lock); | |
1484 | } | |
1485 | ||
e38f8a7a LR |
1486 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1487 | static void reg_process_pending_beacon_hints(void) | |
1488 | { | |
1489 | struct cfg80211_registered_device *drv; | |
1490 | struct reg_beacon *pending_beacon, *tmp; | |
1491 | ||
1492 | mutex_lock(&cfg80211_mutex); | |
1493 | ||
1494 | /* This goes through the _pending_ beacon list */ | |
1495 | spin_lock_bh(®_pending_beacons_lock); | |
1496 | ||
1497 | if (list_empty(®_pending_beacons)) { | |
1498 | spin_unlock_bh(®_pending_beacons_lock); | |
1499 | goto out; | |
1500 | } | |
1501 | ||
1502 | list_for_each_entry_safe(pending_beacon, tmp, | |
1503 | ®_pending_beacons, list) { | |
1504 | ||
1505 | list_del_init(&pending_beacon->list); | |
1506 | ||
1507 | /* Applies the beacon hint to current wiphys */ | |
1508 | list_for_each_entry(drv, &cfg80211_drv_list, list) | |
1509 | wiphy_update_new_beacon(&drv->wiphy, pending_beacon); | |
1510 | ||
1511 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
1512 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
1513 | } | |
1514 | ||
1515 | spin_unlock_bh(®_pending_beacons_lock); | |
1516 | out: | |
1517 | mutex_unlock(&cfg80211_mutex); | |
1518 | } | |
1519 | ||
fe33eb39 LR |
1520 | static void reg_todo(struct work_struct *work) |
1521 | { | |
1522 | reg_process_pending_hints(); | |
e38f8a7a | 1523 | reg_process_pending_beacon_hints(); |
fe33eb39 LR |
1524 | } |
1525 | ||
1526 | static DECLARE_WORK(reg_work, reg_todo); | |
1527 | ||
1528 | static void queue_regulatory_request(struct regulatory_request *request) | |
1529 | { | |
1530 | spin_lock(®_requests_lock); | |
1531 | list_add_tail(&request->list, ®_requests_list); | |
1532 | spin_unlock(®_requests_lock); | |
1533 | ||
1534 | schedule_work(®_work); | |
1535 | } | |
1536 | ||
1537 | /* Core regulatory hint -- happens once during cfg80211_init() */ | |
ba25c141 LR |
1538 | static int regulatory_hint_core(const char *alpha2) |
1539 | { | |
1540 | struct regulatory_request *request; | |
1541 | ||
1542 | BUG_ON(last_request); | |
1543 | ||
1544 | request = kzalloc(sizeof(struct regulatory_request), | |
1545 | GFP_KERNEL); | |
1546 | if (!request) | |
1547 | return -ENOMEM; | |
1548 | ||
1549 | request->alpha2[0] = alpha2[0]; | |
1550 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1551 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
ba25c141 | 1552 | |
fe33eb39 | 1553 | queue_regulatory_request(request); |
ba25c141 | 1554 | |
fe33eb39 | 1555 | return 0; |
ba25c141 LR |
1556 | } |
1557 | ||
fe33eb39 LR |
1558 | /* User hints */ |
1559 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1560 | { |
fe33eb39 LR |
1561 | struct regulatory_request *request; |
1562 | ||
be3d4810 | 1563 | BUG_ON(!alpha2); |
b2e1b302 | 1564 | |
fe33eb39 LR |
1565 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1566 | if (!request) | |
1567 | return -ENOMEM; | |
1568 | ||
1569 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1570 | request->alpha2[0] = alpha2[0]; | |
1571 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1572 | request->initiator = NL80211_REGDOM_SET_BY_USER, |
fe33eb39 LR |
1573 | |
1574 | queue_regulatory_request(request); | |
1575 | ||
1576 | return 0; | |
1577 | } | |
1578 | ||
1579 | /* Driver hints */ | |
1580 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1581 | { | |
1582 | struct regulatory_request *request; | |
1583 | ||
1584 | BUG_ON(!alpha2); | |
1585 | BUG_ON(!wiphy); | |
1586 | ||
1587 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1588 | if (!request) | |
1589 | return -ENOMEM; | |
1590 | ||
1591 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1592 | ||
1593 | /* Must have registered wiphy first */ | |
1594 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1595 | ||
1596 | request->alpha2[0] = alpha2[0]; | |
1597 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1598 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
fe33eb39 LR |
1599 | |
1600 | queue_regulatory_request(request); | |
1601 | ||
1602 | return 0; | |
b2e1b302 LR |
1603 | } |
1604 | EXPORT_SYMBOL(regulatory_hint); | |
1605 | ||
3f2355cb LR |
1606 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, |
1607 | u32 country_ie_checksum) | |
1608 | { | |
806a9e39 LR |
1609 | struct wiphy *request_wiphy; |
1610 | ||
761cf7ec LR |
1611 | assert_cfg80211_lock(); |
1612 | ||
cc0b6fe8 LR |
1613 | if (unlikely(last_request->initiator != |
1614 | NL80211_REGDOM_SET_BY_COUNTRY_IE)) | |
1615 | return false; | |
1616 | ||
806a9e39 LR |
1617 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1618 | ||
1619 | if (!request_wiphy) | |
3f2355cb | 1620 | return false; |
806a9e39 LR |
1621 | |
1622 | if (likely(request_wiphy != wiphy)) | |
3f2355cb | 1623 | return !country_ie_integrity_changes(country_ie_checksum); |
fb1fc7ad LR |
1624 | /* |
1625 | * We should not have let these through at this point, they | |
3f2355cb | 1626 | * should have been picked up earlier by the first alpha2 check |
fb1fc7ad LR |
1627 | * on the device |
1628 | */ | |
3f2355cb LR |
1629 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) |
1630 | return true; | |
1631 | return false; | |
1632 | } | |
1633 | ||
1634 | void regulatory_hint_11d(struct wiphy *wiphy, | |
1635 | u8 *country_ie, | |
1636 | u8 country_ie_len) | |
1637 | { | |
1638 | struct ieee80211_regdomain *rd = NULL; | |
1639 | char alpha2[2]; | |
1640 | u32 checksum = 0; | |
1641 | enum environment_cap env = ENVIRON_ANY; | |
fe33eb39 | 1642 | struct regulatory_request *request; |
3f2355cb | 1643 | |
a1794390 | 1644 | mutex_lock(&cfg80211_mutex); |
3f2355cb | 1645 | |
d335fe63 LR |
1646 | if (unlikely(!last_request)) { |
1647 | mutex_unlock(&cfg80211_mutex); | |
1648 | return; | |
1649 | } | |
1650 | ||
3f2355cb LR |
1651 | /* IE len must be evenly divisible by 2 */ |
1652 | if (country_ie_len & 0x01) | |
1653 | goto out; | |
1654 | ||
1655 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1656 | goto out; | |
1657 | ||
fb1fc7ad LR |
1658 | /* |
1659 | * Pending country IE processing, this can happen after we | |
3f2355cb | 1660 | * call CRDA and wait for a response if a beacon was received before |
fb1fc7ad LR |
1661 | * we were able to process the last regulatory_hint_11d() call |
1662 | */ | |
3f2355cb LR |
1663 | if (country_ie_regdomain) |
1664 | goto out; | |
1665 | ||
1666 | alpha2[0] = country_ie[0]; | |
1667 | alpha2[1] = country_ie[1]; | |
1668 | ||
1669 | if (country_ie[2] == 'I') | |
1670 | env = ENVIRON_INDOOR; | |
1671 | else if (country_ie[2] == 'O') | |
1672 | env = ENVIRON_OUTDOOR; | |
1673 | ||
fb1fc7ad LR |
1674 | /* |
1675 | * We will run this for *every* beacon processed for the BSSID, so | |
3f2355cb | 1676 | * we optimize an early check to exit out early if we don't have to |
fb1fc7ad LR |
1677 | * do anything |
1678 | */ | |
cc0b6fe8 LR |
1679 | if (likely(last_request->initiator == |
1680 | NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1681 | wiphy_idx_valid(last_request->wiphy_idx))) { | |
3f2355cb LR |
1682 | struct cfg80211_registered_device *drv_last_ie; |
1683 | ||
806a9e39 LR |
1684 | drv_last_ie = |
1685 | cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx); | |
3f2355cb | 1686 | |
fb1fc7ad LR |
1687 | /* |
1688 | * Lets keep this simple -- we trust the first AP | |
1689 | * after we intersect with CRDA | |
1690 | */ | |
806a9e39 | 1691 | if (likely(&drv_last_ie->wiphy == wiphy)) { |
fb1fc7ad LR |
1692 | /* |
1693 | * Ignore IEs coming in on this wiphy with | |
1694 | * the same alpha2 and environment cap | |
1695 | */ | |
3f2355cb LR |
1696 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, |
1697 | alpha2) && | |
1698 | env == drv_last_ie->env)) { | |
1699 | goto out; | |
1700 | } | |
fb1fc7ad LR |
1701 | /* |
1702 | * the wiphy moved on to another BSSID or the AP | |
3f2355cb LR |
1703 | * was reconfigured. XXX: We need to deal with the |
1704 | * case where the user suspends and goes to goes | |
1705 | * to another country, and then gets IEs from an | |
fb1fc7ad LR |
1706 | * AP with different settings |
1707 | */ | |
3f2355cb LR |
1708 | goto out; |
1709 | } else { | |
fb1fc7ad LR |
1710 | /* |
1711 | * Ignore IEs coming in on two separate wiphys with | |
1712 | * the same alpha2 and environment cap | |
1713 | */ | |
3f2355cb LR |
1714 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, |
1715 | alpha2) && | |
1716 | env == drv_last_ie->env)) { | |
1717 | goto out; | |
1718 | } | |
1719 | /* We could potentially intersect though */ | |
1720 | goto out; | |
1721 | } | |
1722 | } | |
1723 | ||
1724 | rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); | |
1725 | if (!rd) | |
1726 | goto out; | |
1727 | ||
915278e0 LR |
1728 | /* |
1729 | * This will not happen right now but we leave it here for the | |
3f2355cb LR |
1730 | * the future when we want to add suspend/resume support and having |
1731 | * the user move to another country after doing so, or having the user | |
915278e0 LR |
1732 | * move to another AP. Right now we just trust the first AP. |
1733 | * | |
1734 | * If we hit this before we add this support we want to be informed of | |
1735 | * it as it would indicate a mistake in the current design | |
1736 | */ | |
1737 | if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum))) | |
0441d6ff | 1738 | goto free_rd_out; |
3f2355cb | 1739 | |
fe33eb39 LR |
1740 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1741 | if (!request) | |
1742 | goto free_rd_out; | |
1743 | ||
fb1fc7ad LR |
1744 | /* |
1745 | * We keep this around for when CRDA comes back with a response so | |
1746 | * we can intersect with that | |
1747 | */ | |
3f2355cb LR |
1748 | country_ie_regdomain = rd; |
1749 | ||
fe33eb39 LR |
1750 | request->wiphy_idx = get_wiphy_idx(wiphy); |
1751 | request->alpha2[0] = rd->alpha2[0]; | |
1752 | request->alpha2[1] = rd->alpha2[1]; | |
7db90f4a | 1753 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
fe33eb39 LR |
1754 | request->country_ie_checksum = checksum; |
1755 | request->country_ie_env = env; | |
1756 | ||
1757 | mutex_unlock(&cfg80211_mutex); | |
3f2355cb | 1758 | |
fe33eb39 LR |
1759 | queue_regulatory_request(request); |
1760 | ||
1761 | return; | |
0441d6ff LR |
1762 | |
1763 | free_rd_out: | |
1764 | kfree(rd); | |
3f2355cb | 1765 | out: |
a1794390 | 1766 | mutex_unlock(&cfg80211_mutex); |
3f2355cb LR |
1767 | } |
1768 | EXPORT_SYMBOL(regulatory_hint_11d); | |
b2e1b302 | 1769 | |
e38f8a7a LR |
1770 | static bool freq_is_chan_12_13_14(u16 freq) |
1771 | { | |
1772 | if (freq == ieee80211_channel_to_frequency(12) || | |
1773 | freq == ieee80211_channel_to_frequency(13) || | |
1774 | freq == ieee80211_channel_to_frequency(14)) | |
1775 | return true; | |
1776 | return false; | |
1777 | } | |
1778 | ||
1779 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
1780 | struct ieee80211_channel *beacon_chan, | |
1781 | gfp_t gfp) | |
1782 | { | |
1783 | struct reg_beacon *reg_beacon; | |
1784 | ||
1785 | if (likely((beacon_chan->beacon_found || | |
1786 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || | |
1787 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
1788 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) | |
1789 | return 0; | |
1790 | ||
1791 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
1792 | if (!reg_beacon) | |
1793 | return -ENOMEM; | |
1794 | ||
1795 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1796 | printk(KERN_DEBUG "cfg80211: Found new beacon on " | |
1797 | "frequency: %d MHz (Ch %d) on %s\n", | |
1798 | beacon_chan->center_freq, | |
1799 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
1800 | wiphy_name(wiphy)); | |
1801 | #endif | |
1802 | memcpy(®_beacon->chan, beacon_chan, | |
1803 | sizeof(struct ieee80211_channel)); | |
1804 | ||
1805 | ||
1806 | /* | |
1807 | * Since we can be called from BH or and non-BH context | |
1808 | * we must use spin_lock_bh() | |
1809 | */ | |
1810 | spin_lock_bh(®_pending_beacons_lock); | |
1811 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
1812 | spin_unlock_bh(®_pending_beacons_lock); | |
1813 | ||
1814 | schedule_work(®_work); | |
1815 | ||
1816 | return 0; | |
1817 | } | |
1818 | ||
a3d2eaf0 | 1819 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1820 | { |
1821 | unsigned int i; | |
a3d2eaf0 JB |
1822 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1823 | const struct ieee80211_freq_range *freq_range = NULL; | |
1824 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
1825 | |
1826 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
1827 | "(max_antenna_gain, max_eirp)\n"); | |
1828 | ||
1829 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1830 | reg_rule = &rd->reg_rules[i]; | |
1831 | freq_range = ®_rule->freq_range; | |
1832 | power_rule = ®_rule->power_rule; | |
1833 | ||
fb1fc7ad LR |
1834 | /* |
1835 | * There may not be documentation for max antenna gain | |
1836 | * in certain regions | |
1837 | */ | |
b2e1b302 LR |
1838 | if (power_rule->max_antenna_gain) |
1839 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1840 | "(%d mBi, %d mBm)\n", | |
1841 | freq_range->start_freq_khz, | |
1842 | freq_range->end_freq_khz, | |
1843 | freq_range->max_bandwidth_khz, | |
1844 | power_rule->max_antenna_gain, | |
1845 | power_rule->max_eirp); | |
1846 | else | |
1847 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1848 | "(N/A, %d mBm)\n", | |
1849 | freq_range->start_freq_khz, | |
1850 | freq_range->end_freq_khz, | |
1851 | freq_range->max_bandwidth_khz, | |
1852 | power_rule->max_eirp); | |
1853 | } | |
1854 | } | |
1855 | ||
a3d2eaf0 | 1856 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1857 | { |
1858 | ||
3f2355cb | 1859 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 1860 | |
7db90f4a LR |
1861 | if (last_request->initiator == |
1862 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 LR |
1863 | struct cfg80211_registered_device *drv; |
1864 | drv = cfg80211_drv_by_wiphy_idx( | |
1865 | last_request->wiphy_idx); | |
1866 | if (drv) { | |
3f2355cb LR |
1867 | printk(KERN_INFO "cfg80211: Current regulatory " |
1868 | "domain updated by AP to: %c%c\n", | |
1869 | drv->country_ie_alpha2[0], | |
1870 | drv->country_ie_alpha2[1]); | |
1871 | } else | |
1872 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1873 | "domain intersected: \n"); | |
1874 | } else | |
1875 | printk(KERN_INFO "cfg80211: Current regulatory " | |
039498c6 | 1876 | "domain intersected: \n"); |
3f2355cb | 1877 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
1878 | printk(KERN_INFO "cfg80211: World regulatory " |
1879 | "domain updated:\n"); | |
1880 | else { | |
1881 | if (is_unknown_alpha2(rd->alpha2)) | |
1882 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1883 | "changed to driver built-in settings " | |
1884 | "(unknown country)\n"); | |
1885 | else | |
1886 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1887 | "changed to country: %c%c\n", | |
1888 | rd->alpha2[0], rd->alpha2[1]); | |
1889 | } | |
1890 | print_rd_rules(rd); | |
1891 | } | |
1892 | ||
2df78167 | 1893 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1894 | { |
1895 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1896 | rd->alpha2[0], rd->alpha2[1]); | |
1897 | print_rd_rules(rd); | |
1898 | } | |
1899 | ||
3f2355cb LR |
1900 | #ifdef CONFIG_CFG80211_REG_DEBUG |
1901 | static void reg_country_ie_process_debug( | |
1902 | const struct ieee80211_regdomain *rd, | |
1903 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1904 | const struct ieee80211_regdomain *intersected_rd) | |
1905 | { | |
1906 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
1907 | print_regdomain_info(country_ie_regdomain); | |
1908 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
1909 | print_regdomain_info(rd); | |
1910 | if (intersected_rd) { | |
1911 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
1912 | "and get:\n"); | |
667ecd01 | 1913 | print_regdomain_info(intersected_rd); |
3f2355cb LR |
1914 | return; |
1915 | } | |
1916 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
1917 | } | |
1918 | #else | |
1919 | static inline void reg_country_ie_process_debug( | |
1920 | const struct ieee80211_regdomain *rd, | |
1921 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1922 | const struct ieee80211_regdomain *intersected_rd) | |
1923 | { | |
1924 | } | |
1925 | #endif | |
1926 | ||
d2372b31 | 1927 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1928 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1929 | { |
9c96477d | 1930 | const struct ieee80211_regdomain *intersected_rd = NULL; |
3f2355cb | 1931 | struct cfg80211_registered_device *drv = NULL; |
806a9e39 | 1932 | struct wiphy *request_wiphy; |
b2e1b302 LR |
1933 | /* Some basic sanity checks first */ |
1934 | ||
b2e1b302 | 1935 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1936 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1937 | return -EINVAL; |
1938 | update_world_regdomain(rd); | |
1939 | return 0; | |
1940 | } | |
b2e1b302 LR |
1941 | |
1942 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1943 | !is_unknown_alpha2(rd->alpha2)) | |
1944 | return -EINVAL; | |
1945 | ||
f6037d09 | 1946 | if (!last_request) |
b2e1b302 LR |
1947 | return -EINVAL; |
1948 | ||
fb1fc7ad LR |
1949 | /* |
1950 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 1951 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
1952 | * and the pending request came in from a country IE |
1953 | */ | |
7db90f4a | 1954 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
1955 | /* |
1956 | * If someone else asked us to change the rd lets only bother | |
1957 | * checking if the alpha2 changes if CRDA was already called | |
1958 | */ | |
3f2355cb | 1959 | if (!is_old_static_regdom(cfg80211_regdomain) && |
69b1572b | 1960 | !regdom_changes(rd->alpha2)) |
3f2355cb LR |
1961 | return -EINVAL; |
1962 | } | |
1963 | ||
fb1fc7ad LR |
1964 | /* |
1965 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
1966 | * and finally inform them of what we have done, in case they want |
1967 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
1968 | * internal EEPROM data |
1969 | */ | |
b2e1b302 | 1970 | |
f6037d09 | 1971 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1972 | return -EINVAL; |
1973 | ||
8375af3b LR |
1974 | if (!is_valid_rd(rd)) { |
1975 | printk(KERN_ERR "cfg80211: Invalid " | |
1976 | "regulatory domain detected:\n"); | |
1977 | print_regdomain_info(rd); | |
1978 | return -EINVAL; | |
b2e1b302 LR |
1979 | } |
1980 | ||
806a9e39 LR |
1981 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1982 | ||
b8295acd | 1983 | if (!last_request->intersect) { |
3e0c3ff3 LR |
1984 | int r; |
1985 | ||
7db90f4a | 1986 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
3e0c3ff3 LR |
1987 | reset_regdomains(); |
1988 | cfg80211_regdomain = rd; | |
1989 | return 0; | |
1990 | } | |
1991 | ||
fb1fc7ad LR |
1992 | /* |
1993 | * For a driver hint, lets copy the regulatory domain the | |
1994 | * driver wanted to the wiphy to deal with conflicts | |
1995 | */ | |
3e0c3ff3 | 1996 | |
806a9e39 | 1997 | BUG_ON(request_wiphy->regd); |
3e0c3ff3 | 1998 | |
806a9e39 | 1999 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
2000 | if (r) |
2001 | return r; | |
2002 | ||
b8295acd LR |
2003 | reset_regdomains(); |
2004 | cfg80211_regdomain = rd; | |
2005 | return 0; | |
2006 | } | |
2007 | ||
2008 | /* Intersection requires a bit more work */ | |
2009 | ||
7db90f4a | 2010 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 2011 | |
9c96477d LR |
2012 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
2013 | if (!intersected_rd) | |
2014 | return -EINVAL; | |
b8295acd | 2015 | |
fb1fc7ad LR |
2016 | /* |
2017 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 2018 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
2019 | * domain we keep it for its private use |
2020 | */ | |
7db90f4a | 2021 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 2022 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
2023 | else |
2024 | kfree(rd); | |
2025 | ||
b8295acd LR |
2026 | rd = NULL; |
2027 | ||
2028 | reset_regdomains(); | |
2029 | cfg80211_regdomain = intersected_rd; | |
2030 | ||
2031 | return 0; | |
9c96477d LR |
2032 | } |
2033 | ||
3f2355cb LR |
2034 | /* |
2035 | * Country IE requests are handled a bit differently, we intersect | |
2036 | * the country IE rd with what CRDA believes that country should have | |
2037 | */ | |
2038 | ||
2039 | BUG_ON(!country_ie_regdomain); | |
86f04680 | 2040 | BUG_ON(rd == country_ie_regdomain); |
3f2355cb | 2041 | |
86f04680 LR |
2042 | /* |
2043 | * Intersect what CRDA returned and our what we | |
2044 | * had built from the Country IE received | |
2045 | */ | |
3f2355cb | 2046 | |
86f04680 | 2047 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); |
3f2355cb | 2048 | |
86f04680 LR |
2049 | reg_country_ie_process_debug(rd, |
2050 | country_ie_regdomain, | |
2051 | intersected_rd); | |
3f2355cb | 2052 | |
86f04680 LR |
2053 | kfree(country_ie_regdomain); |
2054 | country_ie_regdomain = NULL; | |
3f2355cb LR |
2055 | |
2056 | if (!intersected_rd) | |
2057 | return -EINVAL; | |
2058 | ||
806a9e39 | 2059 | drv = wiphy_to_dev(request_wiphy); |
3f2355cb LR |
2060 | |
2061 | drv->country_ie_alpha2[0] = rd->alpha2[0]; | |
2062 | drv->country_ie_alpha2[1] = rd->alpha2[1]; | |
2063 | drv->env = last_request->country_ie_env; | |
2064 | ||
2065 | BUG_ON(intersected_rd == rd); | |
2066 | ||
2067 | kfree(rd); | |
2068 | rd = NULL; | |
2069 | ||
b8295acd | 2070 | reset_regdomains(); |
3f2355cb | 2071 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2072 | |
2073 | return 0; | |
2074 | } | |
2075 | ||
2076 | ||
fb1fc7ad LR |
2077 | /* |
2078 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2079 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2080 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2081 | */ | |
a3d2eaf0 | 2082 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2083 | { |
b2e1b302 LR |
2084 | int r; |
2085 | ||
761cf7ec LR |
2086 | assert_cfg80211_lock(); |
2087 | ||
b2e1b302 LR |
2088 | /* Note that this doesn't update the wiphys, this is done below */ |
2089 | r = __set_regdom(rd); | |
d2372b31 JB |
2090 | if (r) { |
2091 | kfree(rd); | |
b2e1b302 | 2092 | return r; |
d2372b31 | 2093 | } |
b2e1b302 | 2094 | |
b2e1b302 | 2095 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2096 | if (!last_request->intersect) |
2097 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2098 | |
2099 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2100 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2101 | |
a01ddafd | 2102 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2103 | |
73d54c9e LR |
2104 | nl80211_send_reg_change_event(last_request); |
2105 | ||
b2e1b302 LR |
2106 | return r; |
2107 | } | |
2108 | ||
a1794390 | 2109 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2110 | void reg_device_remove(struct wiphy *wiphy) |
2111 | { | |
0ad8acaf | 2112 | struct wiphy *request_wiphy = NULL; |
806a9e39 | 2113 | |
761cf7ec LR |
2114 | assert_cfg80211_lock(); |
2115 | ||
0ef9ccdd CW |
2116 | kfree(wiphy->regd); |
2117 | ||
0ad8acaf LR |
2118 | if (last_request) |
2119 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
806a9e39 | 2120 | |
0ef9ccdd | 2121 | if (!request_wiphy || request_wiphy != wiphy) |
3f2355cb | 2122 | return; |
0ef9ccdd | 2123 | |
806a9e39 | 2124 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb LR |
2125 | last_request->country_ie_env = ENVIRON_ANY; |
2126 | } | |
2127 | ||
b2e1b302 LR |
2128 | int regulatory_init(void) |
2129 | { | |
bcf4f99b | 2130 | int err = 0; |
734366de | 2131 | |
b2e1b302 LR |
2132 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2133 | if (IS_ERR(reg_pdev)) | |
2134 | return PTR_ERR(reg_pdev); | |
734366de | 2135 | |
fe33eb39 | 2136 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2137 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2138 | |
734366de | 2139 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY |
a3d2eaf0 | 2140 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 2141 | |
942b25cf | 2142 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de | 2143 | print_regdomain_info(cfg80211_regdomain); |
fb1fc7ad LR |
2144 | /* |
2145 | * The old code still requests for a new regdomain and if | |
734366de | 2146 | * you have CRDA you get it updated, otherwise you get |
2e097dc6 LR |
2147 | * stuck with the static values. Since "EU" is not a valid |
2148 | * ISO / IEC 3166 alpha2 code we can't expect userpace to | |
2149 | * give us a regulatory domain for it. We need last_request | |
2150 | * iniitalized though so lets just send a request which we | |
2151 | * know will be ignored... this crap will be removed once | |
2152 | * OLD_REG dies. | |
fb1fc7ad | 2153 | */ |
2e097dc6 | 2154 | err = regulatory_hint_core(ieee80211_regdom); |
734366de | 2155 | #else |
a3d2eaf0 | 2156 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2157 | |
6ee7d330 | 2158 | err = regulatory_hint_core(ieee80211_regdom); |
bcf4f99b | 2159 | #endif |
ba25c141 | 2160 | if (err) { |
bcf4f99b LR |
2161 | if (err == -ENOMEM) |
2162 | return err; | |
2163 | /* | |
2164 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2165 | * memory which is handled and propagated appropriately above | |
2166 | * but it can also fail during a netlink_broadcast() or during | |
2167 | * early boot for call_usermodehelper(). For now treat these | |
2168 | * errors as non-fatal. | |
2169 | */ | |
2170 | printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " | |
2171 | "to call CRDA during init"); | |
2172 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
2173 | /* We want to find out exactly why when debugging */ | |
2174 | WARN_ON(err); | |
734366de | 2175 | #endif |
bcf4f99b | 2176 | } |
734366de | 2177 | |
b2e1b302 LR |
2178 | return 0; |
2179 | } | |
2180 | ||
2181 | void regulatory_exit(void) | |
2182 | { | |
fe33eb39 | 2183 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2184 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2185 | |
2186 | cancel_work_sync(®_work); | |
2187 | ||
a1794390 | 2188 | mutex_lock(&cfg80211_mutex); |
734366de | 2189 | |
b2e1b302 | 2190 | reset_regdomains(); |
734366de | 2191 | |
3f2355cb LR |
2192 | kfree(country_ie_regdomain); |
2193 | country_ie_regdomain = NULL; | |
2194 | ||
f6037d09 JB |
2195 | kfree(last_request); |
2196 | ||
b2e1b302 | 2197 | platform_device_unregister(reg_pdev); |
734366de | 2198 | |
e38f8a7a LR |
2199 | spin_lock_bh(®_pending_beacons_lock); |
2200 | if (!list_empty(®_pending_beacons)) { | |
2201 | list_for_each_entry_safe(reg_beacon, btmp, | |
2202 | ®_pending_beacons, list) { | |
2203 | list_del(®_beacon->list); | |
2204 | kfree(reg_beacon); | |
2205 | } | |
2206 | } | |
2207 | spin_unlock_bh(®_pending_beacons_lock); | |
2208 | ||
2209 | if (!list_empty(®_beacon_list)) { | |
2210 | list_for_each_entry_safe(reg_beacon, btmp, | |
2211 | ®_beacon_list, list) { | |
2212 | list_del(®_beacon->list); | |
2213 | kfree(reg_beacon); | |
2214 | } | |
2215 | } | |
2216 | ||
fe33eb39 LR |
2217 | spin_lock(®_requests_lock); |
2218 | if (!list_empty(®_requests_list)) { | |
2219 | list_for_each_entry_safe(reg_request, tmp, | |
2220 | ®_requests_list, list) { | |
2221 | list_del(®_request->list); | |
2222 | kfree(reg_request); | |
2223 | } | |
2224 | } | |
2225 | spin_unlock(®_requests_lock); | |
2226 | ||
a1794390 | 2227 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2228 | } |