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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> | |
b2e1b302 | 40 | #include <net/cfg80211.h> |
8318d78a | 41 | #include "core.h" |
b2e1b302 | 42 | #include "reg.h" |
73d54c9e | 43 | #include "nl80211.h" |
8318d78a | 44 | |
5166ccd2 | 45 | /* Receipt of information from last regulatory request */ |
f6037d09 | 46 | static struct regulatory_request *last_request; |
734366de | 47 | |
b2e1b302 LR |
48 | /* To trigger userspace events */ |
49 | static struct platform_device *reg_pdev; | |
8318d78a | 50 | |
fb1fc7ad LR |
51 | /* |
52 | * Central wireless core regulatory domains, we only need two, | |
734366de | 53 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
54 | * information to give us an alpha2 |
55 | */ | |
f130347c | 56 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 57 | |
fb1fc7ad LR |
58 | /* |
59 | * We use this as a place for the rd structure built from the | |
3f2355cb | 60 | * last parsed country IE to rest until CRDA gets back to us with |
fb1fc7ad LR |
61 | * what it thinks should apply for the same country |
62 | */ | |
3f2355cb LR |
63 | static const struct ieee80211_regdomain *country_ie_regdomain; |
64 | ||
e38f8a7a | 65 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
66 | static LIST_HEAD(reg_requests_list); |
67 | static spinlock_t reg_requests_lock; | |
68 | ||
e38f8a7a LR |
69 | /* Used to queue up beacon hints for review */ |
70 | static LIST_HEAD(reg_pending_beacons); | |
71 | static spinlock_t reg_pending_beacons_lock; | |
72 | ||
73 | /* Used to keep track of processed beacon hints */ | |
74 | static LIST_HEAD(reg_beacon_list); | |
75 | ||
76 | struct reg_beacon { | |
77 | struct list_head list; | |
78 | struct ieee80211_channel chan; | |
79 | }; | |
80 | ||
734366de JB |
81 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
82 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 83 | .n_reg_rules = 5, |
734366de JB |
84 | .alpha2 = "00", |
85 | .reg_rules = { | |
68798a62 LR |
86 | /* IEEE 802.11b/g, channels 1..11 */ |
87 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
88 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
89 | * channel fits here. */ | |
90 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
91 | NL80211_RRF_PASSIVE_SCAN | |
92 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
93 | /* IEEE 802.11 channel 14 - Only JP enables |
94 | * this and for 802.11b only */ | |
95 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
96 | NL80211_RRF_PASSIVE_SCAN | | |
97 | NL80211_RRF_NO_IBSS | | |
98 | NL80211_RRF_NO_OFDM), | |
99 | /* IEEE 802.11a, channel 36..48 */ | |
ec329ace | 100 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
101 | NL80211_RRF_PASSIVE_SCAN | |
102 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
103 | |
104 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
105 | ||
106 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 107 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
108 | NL80211_RRF_PASSIVE_SCAN | |
109 | NL80211_RRF_NO_IBSS), | |
734366de JB |
110 | } |
111 | }; | |
112 | ||
a3d2eaf0 JB |
113 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
114 | &world_regdom; | |
734366de | 115 | |
6ee7d330 | 116 | static char *ieee80211_regdom = "00"; |
6ee7d330 | 117 | |
734366de JB |
118 | module_param(ieee80211_regdom, charp, 0444); |
119 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
120 | ||
6ee7d330 | 121 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY |
fb1fc7ad LR |
122 | /* |
123 | * We assume 40 MHz bandwidth for the old regulatory work. | |
734366de | 124 | * We make emphasis we are using the exact same frequencies |
fb1fc7ad LR |
125 | * as before |
126 | */ | |
734366de JB |
127 | |
128 | static const struct ieee80211_regdomain us_regdom = { | |
129 | .n_reg_rules = 6, | |
130 | .alpha2 = "US", | |
131 | .reg_rules = { | |
132 | /* IEEE 802.11b/g, channels 1..11 */ | |
133 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
134 | /* IEEE 802.11a, channel 36 */ | |
135 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
136 | /* IEEE 802.11a, channel 40 */ | |
137 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
138 | /* IEEE 802.11a, channel 44 */ | |
139 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
140 | /* IEEE 802.11a, channels 48..64 */ | |
141 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
142 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
143 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
144 | } | |
145 | }; | |
146 | ||
147 | static const struct ieee80211_regdomain jp_regdom = { | |
148 | .n_reg_rules = 3, | |
149 | .alpha2 = "JP", | |
150 | .reg_rules = { | |
151 | /* IEEE 802.11b/g, channels 1..14 */ | |
152 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
153 | /* IEEE 802.11a, channels 34..48 */ | |
154 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
155 | NL80211_RRF_PASSIVE_SCAN), | |
156 | /* IEEE 802.11a, channels 52..64 */ | |
157 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
158 | NL80211_RRF_NO_IBSS | | |
159 | NL80211_RRF_DFS), | |
160 | } | |
161 | }; | |
162 | ||
163 | static const struct ieee80211_regdomain eu_regdom = { | |
164 | .n_reg_rules = 6, | |
fb1fc7ad LR |
165 | /* |
166 | * This alpha2 is bogus, we leave it here just for stupid | |
167 | * backward compatibility | |
168 | */ | |
734366de JB |
169 | .alpha2 = "EU", |
170 | .reg_rules = { | |
171 | /* IEEE 802.11b/g, channels 1..13 */ | |
172 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
173 | /* IEEE 802.11a, channel 36 */ | |
174 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
175 | NL80211_RRF_PASSIVE_SCAN), | |
176 | /* IEEE 802.11a, channel 40 */ | |
177 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
178 | NL80211_RRF_PASSIVE_SCAN), | |
179 | /* IEEE 802.11a, channel 44 */ | |
180 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
181 | NL80211_RRF_PASSIVE_SCAN), | |
182 | /* IEEE 802.11a, channels 48..64 */ | |
183 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
184 | NL80211_RRF_NO_IBSS | | |
185 | NL80211_RRF_DFS), | |
186 | /* IEEE 802.11a, channels 100..140 */ | |
187 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
188 | NL80211_RRF_NO_IBSS | | |
189 | NL80211_RRF_DFS), | |
190 | } | |
191 | }; | |
192 | ||
193 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
194 | { | |
195 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
196 | return &us_regdom; | |
197 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
198 | return &jp_regdom; | |
199 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
200 | return &eu_regdom; | |
201 | /* Default, as per the old rules */ | |
202 | return &us_regdom; | |
203 | } | |
204 | ||
a3d2eaf0 | 205 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
206 | { |
207 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
208 | return true; | |
209 | return false; | |
210 | } | |
942b25cf JB |
211 | #else |
212 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 213 | { |
942b25cf | 214 | return false; |
734366de | 215 | } |
942b25cf JB |
216 | #endif |
217 | ||
734366de JB |
218 | static void reset_regdomains(void) |
219 | { | |
942b25cf JB |
220 | /* avoid freeing static information or freeing something twice */ |
221 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
222 | cfg80211_regdomain = NULL; | |
223 | if (cfg80211_world_regdom == &world_regdom) | |
224 | cfg80211_world_regdom = NULL; | |
225 | if (cfg80211_regdomain == &world_regdom) | |
226 | cfg80211_regdomain = NULL; | |
227 | if (is_old_static_regdom(cfg80211_regdomain)) | |
228 | cfg80211_regdomain = NULL; | |
229 | ||
230 | kfree(cfg80211_regdomain); | |
231 | kfree(cfg80211_world_regdom); | |
734366de | 232 | |
a3d2eaf0 | 233 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
234 | cfg80211_regdomain = NULL; |
235 | } | |
236 | ||
fb1fc7ad LR |
237 | /* |
238 | * Dynamic world regulatory domain requested by the wireless | |
239 | * core upon initialization | |
240 | */ | |
a3d2eaf0 | 241 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 242 | { |
f6037d09 | 243 | BUG_ON(!last_request); |
734366de JB |
244 | |
245 | reset_regdomains(); | |
246 | ||
247 | cfg80211_world_regdom = rd; | |
248 | cfg80211_regdomain = rd; | |
249 | } | |
734366de | 250 | |
a3d2eaf0 | 251 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
252 | { |
253 | if (!alpha2) | |
254 | return false; | |
255 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
256 | return true; | |
257 | return false; | |
258 | } | |
8318d78a | 259 | |
a3d2eaf0 | 260 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
261 | { |
262 | if (!alpha2) | |
263 | return false; | |
264 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
265 | return true; | |
266 | return false; | |
267 | } | |
8318d78a | 268 | |
b2e1b302 LR |
269 | static bool is_alpha_upper(char letter) |
270 | { | |
271 | /* ASCII A - Z */ | |
272 | if (letter >= 65 && letter <= 90) | |
273 | return true; | |
274 | return false; | |
275 | } | |
8318d78a | 276 | |
a3d2eaf0 | 277 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
278 | { |
279 | if (!alpha2) | |
280 | return false; | |
fb1fc7ad LR |
281 | /* |
282 | * Special case where regulatory domain was built by driver | |
283 | * but a specific alpha2 cannot be determined | |
284 | */ | |
b2e1b302 LR |
285 | if (alpha2[0] == '9' && alpha2[1] == '9') |
286 | return true; | |
287 | return false; | |
288 | } | |
8318d78a | 289 | |
3f2355cb LR |
290 | static bool is_intersected_alpha2(const char *alpha2) |
291 | { | |
292 | if (!alpha2) | |
293 | return false; | |
fb1fc7ad LR |
294 | /* |
295 | * Special case where regulatory domain is the | |
3f2355cb | 296 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
297 | * structures |
298 | */ | |
3f2355cb LR |
299 | if (alpha2[0] == '9' && alpha2[1] == '8') |
300 | return true; | |
301 | return false; | |
302 | } | |
303 | ||
a3d2eaf0 | 304 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
305 | { |
306 | if (!alpha2) | |
307 | return false; | |
308 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
309 | return true; | |
310 | return false; | |
311 | } | |
8318d78a | 312 | |
a3d2eaf0 | 313 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
314 | { |
315 | if (!alpha2_x || !alpha2_y) | |
316 | return false; | |
317 | if (alpha2_x[0] == alpha2_y[0] && | |
318 | alpha2_x[1] == alpha2_y[1]) | |
319 | return true; | |
320 | return false; | |
321 | } | |
322 | ||
69b1572b | 323 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 324 | { |
761cf7ec LR |
325 | assert_cfg80211_lock(); |
326 | ||
b2e1b302 LR |
327 | if (!cfg80211_regdomain) |
328 | return true; | |
329 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
330 | return false; | |
331 | return true; | |
332 | } | |
333 | ||
3f2355cb LR |
334 | /** |
335 | * country_ie_integrity_changes - tells us if the country IE has changed | |
336 | * @checksum: checksum of country IE of fields we are interested in | |
337 | * | |
338 | * If the country IE has not changed you can ignore it safely. This is | |
339 | * useful to determine if two devices are seeing two different country IEs | |
340 | * even on the same alpha2. Note that this will return false if no IE has | |
341 | * been set on the wireless core yet. | |
342 | */ | |
343 | static bool country_ie_integrity_changes(u32 checksum) | |
344 | { | |
345 | /* If no IE has been set then the checksum doesn't change */ | |
346 | if (unlikely(!last_request->country_ie_checksum)) | |
347 | return false; | |
348 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
349 | return true; | |
350 | return false; | |
351 | } | |
352 | ||
fb1fc7ad LR |
353 | /* |
354 | * This lets us keep regulatory code which is updated on a regulatory | |
355 | * basis in userspace. | |
356 | */ | |
b2e1b302 LR |
357 | static int call_crda(const char *alpha2) |
358 | { | |
359 | char country_env[9 + 2] = "COUNTRY="; | |
360 | char *envp[] = { | |
361 | country_env, | |
362 | NULL | |
363 | }; | |
364 | ||
365 | if (!is_world_regdom((char *) alpha2)) | |
366 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
367 | alpha2[0], alpha2[1]); | |
368 | else | |
b2e1b302 LR |
369 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
370 | "regulatory domain\n"); | |
b2e1b302 LR |
371 | |
372 | country_env[8] = alpha2[0]; | |
373 | country_env[9] = alpha2[1]; | |
374 | ||
375 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
376 | } | |
377 | ||
b2e1b302 | 378 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 379 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 380 | { |
61405e97 LR |
381 | assert_cfg80211_lock(); |
382 | ||
f6037d09 JB |
383 | if (!last_request) |
384 | return false; | |
385 | ||
386 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 387 | } |
8318d78a | 388 | |
b2e1b302 | 389 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 390 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 391 | { |
a3d2eaf0 | 392 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
393 | u32 freq_diff; |
394 | ||
91e99004 | 395 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
396 | return false; |
397 | ||
398 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
399 | return false; | |
400 | ||
401 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
402 | ||
bd05f28e RK |
403 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
404 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
405 | return false; |
406 | ||
407 | return true; | |
408 | } | |
409 | ||
a3d2eaf0 | 410 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 411 | { |
a3d2eaf0 | 412 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 413 | unsigned int i; |
8318d78a | 414 | |
b2e1b302 LR |
415 | if (!rd->n_reg_rules) |
416 | return false; | |
8318d78a | 417 | |
88dc1c3f LR |
418 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
419 | return false; | |
420 | ||
b2e1b302 LR |
421 | for (i = 0; i < rd->n_reg_rules; i++) { |
422 | reg_rule = &rd->reg_rules[i]; | |
423 | if (!is_valid_reg_rule(reg_rule)) | |
424 | return false; | |
425 | } | |
426 | ||
427 | return true; | |
8318d78a JB |
428 | } |
429 | ||
038659e7 LR |
430 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, |
431 | u32 center_freq_khz, | |
432 | u32 bw_khz) | |
b2e1b302 | 433 | { |
038659e7 LR |
434 | u32 start_freq_khz, end_freq_khz; |
435 | ||
436 | start_freq_khz = center_freq_khz - (bw_khz/2); | |
437 | end_freq_khz = center_freq_khz + (bw_khz/2); | |
438 | ||
439 | if (start_freq_khz >= freq_range->start_freq_khz && | |
440 | end_freq_khz <= freq_range->end_freq_khz) | |
441 | return true; | |
442 | ||
443 | return false; | |
b2e1b302 | 444 | } |
8318d78a | 445 | |
0c7dc45d LR |
446 | /** |
447 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
448 | * @freq_range: frequency rule we want to query | |
449 | * @freq_khz: frequency we are inquiring about | |
450 | * | |
451 | * This lets us know if a specific frequency rule is or is not relevant to | |
452 | * a specific frequency's band. Bands are device specific and artificial | |
453 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
454 | * safe for now to assume that a frequency rule should not be part of a | |
455 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
456 | * This resolution can be lowered and should be considered as we add | |
457 | * regulatory rule support for other "bands". | |
458 | **/ | |
459 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
460 | u32 freq_khz) | |
461 | { | |
462 | #define ONE_GHZ_IN_KHZ 1000000 | |
463 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
464 | return true; | |
465 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
466 | return true; | |
467 | return false; | |
468 | #undef ONE_GHZ_IN_KHZ | |
469 | } | |
470 | ||
fb1fc7ad LR |
471 | /* |
472 | * Converts a country IE to a regulatory domain. A regulatory domain | |
3f2355cb LR |
473 | * structure has a lot of information which the IE doesn't yet have, |
474 | * so for the other values we use upper max values as we will intersect | |
fb1fc7ad LR |
475 | * with our userspace regulatory agent to get lower bounds. |
476 | */ | |
3f2355cb LR |
477 | static struct ieee80211_regdomain *country_ie_2_rd( |
478 | u8 *country_ie, | |
479 | u8 country_ie_len, | |
480 | u32 *checksum) | |
481 | { | |
482 | struct ieee80211_regdomain *rd = NULL; | |
483 | unsigned int i = 0; | |
484 | char alpha2[2]; | |
485 | u32 flags = 0; | |
486 | u32 num_rules = 0, size_of_regd = 0; | |
487 | u8 *triplets_start = NULL; | |
488 | u8 len_at_triplet = 0; | |
489 | /* the last channel we have registered in a subband (triplet) */ | |
490 | int last_sub_max_channel = 0; | |
491 | ||
492 | *checksum = 0xDEADBEEF; | |
493 | ||
494 | /* Country IE requirements */ | |
495 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
496 | country_ie_len & 0x01); | |
497 | ||
498 | alpha2[0] = country_ie[0]; | |
499 | alpha2[1] = country_ie[1]; | |
500 | ||
501 | /* | |
502 | * Third octet can be: | |
503 | * 'I' - Indoor | |
504 | * 'O' - Outdoor | |
505 | * | |
506 | * anything else we assume is no restrictions | |
507 | */ | |
508 | if (country_ie[2] == 'I') | |
509 | flags = NL80211_RRF_NO_OUTDOOR; | |
510 | else if (country_ie[2] == 'O') | |
511 | flags = NL80211_RRF_NO_INDOOR; | |
512 | ||
513 | country_ie += 3; | |
514 | country_ie_len -= 3; | |
515 | ||
516 | triplets_start = country_ie; | |
517 | len_at_triplet = country_ie_len; | |
518 | ||
519 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
520 | ||
fb1fc7ad LR |
521 | /* |
522 | * We need to build a reg rule for each triplet, but first we must | |
3f2355cb | 523 | * calculate the number of reg rules we will need. We will need one |
fb1fc7ad LR |
524 | * for each channel subband |
525 | */ | |
3f2355cb | 526 | while (country_ie_len >= 3) { |
615aab4b | 527 | int end_channel = 0; |
3f2355cb LR |
528 | struct ieee80211_country_ie_triplet *triplet = |
529 | (struct ieee80211_country_ie_triplet *) country_ie; | |
530 | int cur_sub_max_channel = 0, cur_channel = 0; | |
531 | ||
532 | if (triplet->ext.reg_extension_id >= | |
533 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
534 | country_ie += 3; | |
535 | country_ie_len -= 3; | |
536 | continue; | |
537 | } | |
538 | ||
615aab4b LR |
539 | /* 2 GHz */ |
540 | if (triplet->chans.first_channel <= 14) | |
541 | end_channel = triplet->chans.first_channel + | |
542 | triplet->chans.num_channels; | |
543 | else | |
544 | /* | |
545 | * 5 GHz -- For example in country IEs if the first | |
546 | * channel given is 36 and the number of channels is 4 | |
547 | * then the individual channel numbers defined for the | |
548 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
549 | * and not 36, 37, 38, 39. | |
550 | * | |
551 | * See: http://tinyurl.com/11d-clarification | |
552 | */ | |
553 | end_channel = triplet->chans.first_channel + | |
554 | (4 * (triplet->chans.num_channels - 1)); | |
555 | ||
3f2355cb | 556 | cur_channel = triplet->chans.first_channel; |
615aab4b | 557 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
558 | |
559 | /* Basic sanity check */ | |
560 | if (cur_sub_max_channel < cur_channel) | |
561 | return NULL; | |
562 | ||
fb1fc7ad LR |
563 | /* |
564 | * Do not allow overlapping channels. Also channels | |
3f2355cb | 565 | * passed in each subband must be monotonically |
fb1fc7ad LR |
566 | * increasing |
567 | */ | |
3f2355cb LR |
568 | if (last_sub_max_channel) { |
569 | if (cur_channel <= last_sub_max_channel) | |
570 | return NULL; | |
571 | if (cur_sub_max_channel <= last_sub_max_channel) | |
572 | return NULL; | |
573 | } | |
574 | ||
fb1fc7ad LR |
575 | /* |
576 | * When dot11RegulatoryClassesRequired is supported | |
3f2355cb LR |
577 | * we can throw ext triplets as part of this soup, |
578 | * for now we don't care when those change as we | |
fb1fc7ad LR |
579 | * don't support them |
580 | */ | |
3f2355cb LR |
581 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | |
582 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
583 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
584 | ||
585 | last_sub_max_channel = cur_sub_max_channel; | |
586 | ||
587 | country_ie += 3; | |
588 | country_ie_len -= 3; | |
589 | num_rules++; | |
590 | ||
fb1fc7ad LR |
591 | /* |
592 | * Note: this is not a IEEE requirement but | |
593 | * simply a memory requirement | |
594 | */ | |
3f2355cb LR |
595 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) |
596 | return NULL; | |
597 | } | |
598 | ||
599 | country_ie = triplets_start; | |
600 | country_ie_len = len_at_triplet; | |
601 | ||
602 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
603 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
604 | ||
605 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
606 | if (!rd) | |
607 | return NULL; | |
608 | ||
609 | rd->n_reg_rules = num_rules; | |
610 | rd->alpha2[0] = alpha2[0]; | |
611 | rd->alpha2[1] = alpha2[1]; | |
612 | ||
613 | /* This time around we fill in the rd */ | |
614 | while (country_ie_len >= 3) { | |
02e68a3d | 615 | int end_channel = 0; |
3f2355cb LR |
616 | struct ieee80211_country_ie_triplet *triplet = |
617 | (struct ieee80211_country_ie_triplet *) country_ie; | |
618 | struct ieee80211_reg_rule *reg_rule = NULL; | |
619 | struct ieee80211_freq_range *freq_range = NULL; | |
620 | struct ieee80211_power_rule *power_rule = NULL; | |
621 | ||
fb1fc7ad LR |
622 | /* |
623 | * Must parse if dot11RegulatoryClassesRequired is true, | |
624 | * we don't support this yet | |
625 | */ | |
3f2355cb LR |
626 | if (triplet->ext.reg_extension_id >= |
627 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
628 | country_ie += 3; | |
629 | country_ie_len -= 3; | |
630 | continue; | |
631 | } | |
632 | ||
633 | reg_rule = &rd->reg_rules[i]; | |
634 | freq_range = ®_rule->freq_range; | |
635 | power_rule = ®_rule->power_rule; | |
636 | ||
637 | reg_rule->flags = flags; | |
638 | ||
02e68a3d LR |
639 | /* 2 GHz */ |
640 | if (triplet->chans.first_channel <= 14) | |
641 | end_channel = triplet->chans.first_channel + | |
642 | triplet->chans.num_channels; | |
643 | else | |
02e68a3d LR |
644 | end_channel = triplet->chans.first_channel + |
645 | (4 * (triplet->chans.num_channels - 1)); | |
646 | ||
fb1fc7ad LR |
647 | /* |
648 | * The +10 is since the regulatory domain expects | |
3f2355cb LR |
649 | * the actual band edge, not the center of freq for |
650 | * its start and end freqs, assuming 20 MHz bandwidth on | |
fb1fc7ad LR |
651 | * the channels passed |
652 | */ | |
3f2355cb LR |
653 | freq_range->start_freq_khz = |
654 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
655 | triplet->chans.first_channel) - 10); | |
656 | freq_range->end_freq_khz = | |
657 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 658 | end_channel) + 10); |
3f2355cb | 659 | |
fb1fc7ad LR |
660 | /* |
661 | * These are large arbitrary values we use to intersect later. | |
662 | * Increment this if we ever support >= 40 MHz channels | |
663 | * in IEEE 802.11 | |
664 | */ | |
3f2355cb LR |
665 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); |
666 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
667 | power_rule->max_eirp = DBM_TO_MBM(100); | |
668 | ||
669 | country_ie += 3; | |
670 | country_ie_len -= 3; | |
671 | i++; | |
672 | ||
673 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
674 | } | |
675 | ||
676 | return rd; | |
677 | } | |
678 | ||
679 | ||
fb1fc7ad LR |
680 | /* |
681 | * Helper for regdom_intersect(), this does the real | |
682 | * mathematical intersection fun | |
683 | */ | |
9c96477d LR |
684 | static int reg_rules_intersect( |
685 | const struct ieee80211_reg_rule *rule1, | |
686 | const struct ieee80211_reg_rule *rule2, | |
687 | struct ieee80211_reg_rule *intersected_rule) | |
688 | { | |
689 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
690 | struct ieee80211_freq_range *freq_range; | |
691 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
692 | struct ieee80211_power_rule *power_rule; | |
693 | u32 freq_diff; | |
694 | ||
695 | freq_range1 = &rule1->freq_range; | |
696 | freq_range2 = &rule2->freq_range; | |
697 | freq_range = &intersected_rule->freq_range; | |
698 | ||
699 | power_rule1 = &rule1->power_rule; | |
700 | power_rule2 = &rule2->power_rule; | |
701 | power_rule = &intersected_rule->power_rule; | |
702 | ||
703 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
704 | freq_range2->start_freq_khz); | |
705 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
706 | freq_range2->end_freq_khz); | |
707 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
708 | freq_range2->max_bandwidth_khz); | |
709 | ||
710 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
711 | if (freq_range->max_bandwidth_khz > freq_diff) | |
712 | freq_range->max_bandwidth_khz = freq_diff; | |
713 | ||
714 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
715 | power_rule2->max_eirp); | |
716 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
717 | power_rule2->max_antenna_gain); | |
718 | ||
719 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
720 | ||
721 | if (!is_valid_reg_rule(intersected_rule)) | |
722 | return -EINVAL; | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
727 | /** | |
728 | * regdom_intersect - do the intersection between two regulatory domains | |
729 | * @rd1: first regulatory domain | |
730 | * @rd2: second regulatory domain | |
731 | * | |
732 | * Use this function to get the intersection between two regulatory domains. | |
733 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
734 | * as no one single alpha2 can represent this regulatory domain. | |
735 | * | |
736 | * Returns a pointer to the regulatory domain structure which will hold the | |
737 | * resulting intersection of rules between rd1 and rd2. We will | |
738 | * kzalloc() this structure for you. | |
739 | */ | |
740 | static struct ieee80211_regdomain *regdom_intersect( | |
741 | const struct ieee80211_regdomain *rd1, | |
742 | const struct ieee80211_regdomain *rd2) | |
743 | { | |
744 | int r, size_of_regd; | |
745 | unsigned int x, y; | |
746 | unsigned int num_rules = 0, rule_idx = 0; | |
747 | const struct ieee80211_reg_rule *rule1, *rule2; | |
748 | struct ieee80211_reg_rule *intersected_rule; | |
749 | struct ieee80211_regdomain *rd; | |
750 | /* This is just a dummy holder to help us count */ | |
751 | struct ieee80211_reg_rule irule; | |
752 | ||
753 | /* Uses the stack temporarily for counter arithmetic */ | |
754 | intersected_rule = &irule; | |
755 | ||
756 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
757 | ||
758 | if (!rd1 || !rd2) | |
759 | return NULL; | |
760 | ||
fb1fc7ad LR |
761 | /* |
762 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
763 | * build them. This is to so we can malloc() and free() a |
764 | * regdomain once. The reason we use reg_rules_intersect() here | |
765 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
766 | * All rules that do check out OK are valid. |
767 | */ | |
9c96477d LR |
768 | |
769 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
770 | rule1 = &rd1->reg_rules[x]; | |
771 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
772 | rule2 = &rd2->reg_rules[y]; | |
773 | if (!reg_rules_intersect(rule1, rule2, | |
774 | intersected_rule)) | |
775 | num_rules++; | |
776 | memset(intersected_rule, 0, | |
777 | sizeof(struct ieee80211_reg_rule)); | |
778 | } | |
779 | } | |
780 | ||
781 | if (!num_rules) | |
782 | return NULL; | |
783 | ||
784 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
785 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
786 | ||
787 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
788 | if (!rd) | |
789 | return NULL; | |
790 | ||
791 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
792 | rule1 = &rd1->reg_rules[x]; | |
793 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
794 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
795 | /* |
796 | * This time around instead of using the stack lets | |
9c96477d | 797 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
798 | * a memcpy() |
799 | */ | |
9c96477d LR |
800 | intersected_rule = &rd->reg_rules[rule_idx]; |
801 | r = reg_rules_intersect(rule1, rule2, | |
802 | intersected_rule); | |
fb1fc7ad LR |
803 | /* |
804 | * No need to memset here the intersected rule here as | |
805 | * we're not using the stack anymore | |
806 | */ | |
9c96477d LR |
807 | if (r) |
808 | continue; | |
809 | rule_idx++; | |
810 | } | |
811 | } | |
812 | ||
813 | if (rule_idx != num_rules) { | |
814 | kfree(rd); | |
815 | return NULL; | |
816 | } | |
817 | ||
818 | rd->n_reg_rules = num_rules; | |
819 | rd->alpha2[0] = '9'; | |
820 | rd->alpha2[1] = '8'; | |
821 | ||
822 | return rd; | |
823 | } | |
824 | ||
fb1fc7ad LR |
825 | /* |
826 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
827 | * want to just have the channel structure use these | |
828 | */ | |
b2e1b302 LR |
829 | static u32 map_regdom_flags(u32 rd_flags) |
830 | { | |
831 | u32 channel_flags = 0; | |
832 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
833 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
834 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
835 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
836 | if (rd_flags & NL80211_RRF_DFS) | |
837 | channel_flags |= IEEE80211_CHAN_RADAR; | |
838 | return channel_flags; | |
839 | } | |
840 | ||
1fa25e41 LR |
841 | static int freq_reg_info_regd(struct wiphy *wiphy, |
842 | u32 center_freq, | |
038659e7 | 843 | u32 desired_bw_khz, |
1fa25e41 LR |
844 | const struct ieee80211_reg_rule **reg_rule, |
845 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
846 | { |
847 | int i; | |
0c7dc45d | 848 | bool band_rule_found = false; |
3e0c3ff3 | 849 | const struct ieee80211_regdomain *regd; |
038659e7 LR |
850 | bool bw_fits = false; |
851 | ||
852 | if (!desired_bw_khz) | |
853 | desired_bw_khz = MHZ_TO_KHZ(20); | |
8318d78a | 854 | |
1fa25e41 | 855 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 856 | |
fb1fc7ad LR |
857 | /* |
858 | * Follow the driver's regulatory domain, if present, unless a country | |
859 | * IE has been processed or a user wants to help complaince further | |
860 | */ | |
7db90f4a LR |
861 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
862 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && | |
3e0c3ff3 LR |
863 | wiphy->regd) |
864 | regd = wiphy->regd; | |
865 | ||
866 | if (!regd) | |
b2e1b302 LR |
867 | return -EINVAL; |
868 | ||
3e0c3ff3 | 869 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
870 | const struct ieee80211_reg_rule *rr; |
871 | const struct ieee80211_freq_range *fr = NULL; | |
872 | const struct ieee80211_power_rule *pr = NULL; | |
873 | ||
3e0c3ff3 | 874 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
875 | fr = &rr->freq_range; |
876 | pr = &rr->power_rule; | |
0c7dc45d | 877 | |
fb1fc7ad LR |
878 | /* |
879 | * We only need to know if one frequency rule was | |
0c7dc45d | 880 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
881 | * not overwrite it once found |
882 | */ | |
0c7dc45d LR |
883 | if (!band_rule_found) |
884 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
885 | ||
038659e7 LR |
886 | bw_fits = reg_does_bw_fit(fr, |
887 | center_freq, | |
888 | desired_bw_khz); | |
0c7dc45d | 889 | |
038659e7 | 890 | if (band_rule_found && bw_fits) { |
b2e1b302 | 891 | *reg_rule = rr; |
038659e7 | 892 | return 0; |
8318d78a JB |
893 | } |
894 | } | |
895 | ||
0c7dc45d LR |
896 | if (!band_rule_found) |
897 | return -ERANGE; | |
898 | ||
038659e7 | 899 | return -EINVAL; |
b2e1b302 | 900 | } |
34f57347 | 901 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 902 | |
038659e7 LR |
903 | int freq_reg_info(struct wiphy *wiphy, |
904 | u32 center_freq, | |
905 | u32 desired_bw_khz, | |
906 | const struct ieee80211_reg_rule **reg_rule) | |
1fa25e41 | 907 | { |
ac46d48e | 908 | assert_cfg80211_lock(); |
038659e7 LR |
909 | return freq_reg_info_regd(wiphy, |
910 | center_freq, | |
911 | desired_bw_khz, | |
912 | reg_rule, | |
913 | NULL); | |
1fa25e41 | 914 | } |
b2e1b302 | 915 | |
038659e7 LR |
916 | /* |
917 | * Note that right now we assume the desired channel bandwidth | |
918 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz | |
919 | * per channel, the primary and the extension channel). To support | |
920 | * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a | |
921 | * new ieee80211_channel.target_bw and re run the regulatory check | |
922 | * on the wiphy with the target_bw specified. Then we can simply use | |
923 | * that below for the desired_bw_khz below. | |
924 | */ | |
a92a3ce7 LR |
925 | static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, |
926 | unsigned int chan_idx) | |
b2e1b302 LR |
927 | { |
928 | int r; | |
038659e7 LR |
929 | u32 flags, bw_flags = 0; |
930 | u32 desired_bw_khz = MHZ_TO_KHZ(20); | |
b2e1b302 LR |
931 | const struct ieee80211_reg_rule *reg_rule = NULL; |
932 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 933 | const struct ieee80211_freq_range *freq_range = NULL; |
a92a3ce7 LR |
934 | struct ieee80211_supported_band *sband; |
935 | struct ieee80211_channel *chan; | |
fe33eb39 | 936 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 937 | |
761cf7ec LR |
938 | assert_cfg80211_lock(); |
939 | ||
806a9e39 LR |
940 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
941 | ||
a92a3ce7 LR |
942 | sband = wiphy->bands[band]; |
943 | BUG_ON(chan_idx >= sband->n_channels); | |
944 | chan = &sband->channels[chan_idx]; | |
945 | ||
946 | flags = chan->orig_flags; | |
b2e1b302 | 947 | |
038659e7 LR |
948 | r = freq_reg_info(wiphy, |
949 | MHZ_TO_KHZ(chan->center_freq), | |
950 | desired_bw_khz, | |
951 | ®_rule); | |
b2e1b302 LR |
952 | |
953 | if (r) { | |
fb1fc7ad LR |
954 | /* |
955 | * This means no regulatory rule was found in the country IE | |
0c7dc45d LR |
956 | * with a frequency range on the center_freq's band, since |
957 | * IEEE-802.11 allows for a country IE to have a subset of the | |
958 | * regulatory information provided in a country we ignore | |
959 | * disabling the channel unless at least one reg rule was | |
960 | * found on the center_freq's band. For details see this | |
961 | * clarification: | |
962 | * | |
963 | * http://tinyurl.com/11d-clarification | |
964 | */ | |
965 | if (r == -ERANGE && | |
7db90f4a LR |
966 | last_request->initiator == |
967 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
0c7dc45d LR |
968 | #ifdef CONFIG_CFG80211_REG_DEBUG |
969 | printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " | |
970 | "intact on %s - no rule found in band on " | |
971 | "Country IE\n", | |
972 | chan->center_freq, wiphy_name(wiphy)); | |
973 | #endif | |
974 | } else { | |
fb1fc7ad LR |
975 | /* |
976 | * In this case we know the country IE has at least one reg rule | |
977 | * for the band so we respect its band definitions | |
978 | */ | |
0c7dc45d | 979 | #ifdef CONFIG_CFG80211_REG_DEBUG |
7db90f4a LR |
980 | if (last_request->initiator == |
981 | NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
0c7dc45d LR |
982 | printk(KERN_DEBUG "cfg80211: Disabling " |
983 | "channel %d MHz on %s due to " | |
984 | "Country IE\n", | |
985 | chan->center_freq, wiphy_name(wiphy)); | |
986 | #endif | |
987 | flags |= IEEE80211_CHAN_DISABLED; | |
988 | chan->flags = flags; | |
989 | } | |
8318d78a JB |
990 | return; |
991 | } | |
992 | ||
b2e1b302 | 993 | power_rule = ®_rule->power_rule; |
038659e7 LR |
994 | freq_range = ®_rule->freq_range; |
995 | ||
996 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
997 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
b2e1b302 | 998 | |
7db90f4a | 999 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
806a9e39 LR |
1000 | request_wiphy && request_wiphy == wiphy && |
1001 | request_wiphy->strict_regulatory) { | |
fb1fc7ad LR |
1002 | /* |
1003 | * This gaurantees the driver's requested regulatory domain | |
f976376d | 1004 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
1005 | * settings |
1006 | */ | |
f976376d | 1007 | chan->flags = chan->orig_flags = |
038659e7 | 1008 | map_regdom_flags(reg_rule->flags) | bw_flags; |
f976376d LR |
1009 | chan->max_antenna_gain = chan->orig_mag = |
1010 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
038659e7 | 1011 | chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz); |
f976376d LR |
1012 | chan->max_power = chan->orig_mpwr = |
1013 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
1014 | return; | |
1015 | } | |
1016 | ||
038659e7 | 1017 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 1018 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 | 1019 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
038659e7 | 1020 | chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz); |
253898c4 | 1021 | if (chan->orig_mpwr) |
b2e1b302 LR |
1022 | chan->max_power = min(chan->orig_mpwr, |
1023 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 1024 | else |
b2e1b302 | 1025 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
1026 | } |
1027 | ||
a92a3ce7 | 1028 | static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) |
8318d78a | 1029 | { |
a92a3ce7 LR |
1030 | unsigned int i; |
1031 | struct ieee80211_supported_band *sband; | |
1032 | ||
1033 | BUG_ON(!wiphy->bands[band]); | |
1034 | sband = wiphy->bands[band]; | |
8318d78a JB |
1035 | |
1036 | for (i = 0; i < sband->n_channels; i++) | |
a92a3ce7 | 1037 | handle_channel(wiphy, band, i); |
8318d78a JB |
1038 | } |
1039 | ||
7db90f4a LR |
1040 | static bool ignore_reg_update(struct wiphy *wiphy, |
1041 | enum nl80211_reg_initiator initiator) | |
14b9815a LR |
1042 | { |
1043 | if (!last_request) | |
1044 | return true; | |
7db90f4a | 1045 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
2a44f911 | 1046 | wiphy->custom_regulatory) |
14b9815a | 1047 | return true; |
fb1fc7ad LR |
1048 | /* |
1049 | * wiphy->regd will be set once the device has its own | |
1050 | * desired regulatory domain set | |
1051 | */ | |
f976376d LR |
1052 | if (wiphy->strict_regulatory && !wiphy->regd && |
1053 | !is_world_regdom(last_request->alpha2)) | |
14b9815a LR |
1054 | return true; |
1055 | return false; | |
1056 | } | |
1057 | ||
7db90f4a | 1058 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
8318d78a | 1059 | { |
79c97e97 | 1060 | struct cfg80211_registered_device *rdev; |
8318d78a | 1061 | |
79c97e97 JB |
1062 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1063 | wiphy_update_regulatory(&rdev->wiphy, initiator); | |
b2e1b302 LR |
1064 | } |
1065 | ||
e38f8a7a LR |
1066 | static void handle_reg_beacon(struct wiphy *wiphy, |
1067 | unsigned int chan_idx, | |
1068 | struct reg_beacon *reg_beacon) | |
1069 | { | |
e38f8a7a LR |
1070 | struct ieee80211_supported_band *sband; |
1071 | struct ieee80211_channel *chan; | |
6bad8766 LR |
1072 | bool channel_changed = false; |
1073 | struct ieee80211_channel chan_before; | |
e38f8a7a LR |
1074 | |
1075 | assert_cfg80211_lock(); | |
1076 | ||
1077 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1078 | chan = &sband->channels[chan_idx]; | |
1079 | ||
1080 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
1081 | return; | |
1082 | ||
6bad8766 LR |
1083 | if (chan->beacon_found) |
1084 | return; | |
1085 | ||
1086 | chan->beacon_found = true; | |
1087 | ||
1088 | chan_before.center_freq = chan->center_freq; | |
1089 | chan_before.flags = chan->flags; | |
1090 | ||
a4ed90d6 LR |
1091 | if ((chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) && |
1092 | !(chan->orig_flags & IEEE80211_CHAN_PASSIVE_SCAN)) { | |
e38f8a7a | 1093 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; |
6bad8766 | 1094 | channel_changed = true; |
e38f8a7a LR |
1095 | } |
1096 | ||
a4ed90d6 LR |
1097 | if ((chan->flags & IEEE80211_CHAN_NO_IBSS) && |
1098 | !(chan->orig_flags & IEEE80211_CHAN_NO_IBSS)) { | |
e38f8a7a | 1099 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; |
6bad8766 | 1100 | channel_changed = true; |
e38f8a7a LR |
1101 | } |
1102 | ||
6bad8766 LR |
1103 | if (channel_changed) |
1104 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
e38f8a7a LR |
1105 | } |
1106 | ||
1107 | /* | |
1108 | * Called when a scan on a wiphy finds a beacon on | |
1109 | * new channel | |
1110 | */ | |
1111 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
1112 | struct reg_beacon *reg_beacon) | |
1113 | { | |
1114 | unsigned int i; | |
1115 | struct ieee80211_supported_band *sband; | |
1116 | ||
1117 | assert_cfg80211_lock(); | |
1118 | ||
1119 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1120 | return; | |
1121 | ||
1122 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1123 | ||
1124 | for (i = 0; i < sband->n_channels; i++) | |
1125 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Called upon reg changes or a new wiphy is added | |
1130 | */ | |
1131 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1132 | { | |
1133 | unsigned int i; | |
1134 | struct ieee80211_supported_band *sband; | |
1135 | struct reg_beacon *reg_beacon; | |
1136 | ||
1137 | assert_cfg80211_lock(); | |
1138 | ||
1139 | if (list_empty(®_beacon_list)) | |
1140 | return; | |
1141 | ||
1142 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1143 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1144 | continue; | |
1145 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1146 | for (i = 0; i < sband->n_channels; i++) | |
1147 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1152 | { | |
1153 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1154 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1155 | return true; | |
b1ed8ddd LR |
1156 | if (last_request && |
1157 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
e38f8a7a LR |
1158 | wiphy->custom_regulatory) |
1159 | return true; | |
1160 | return false; | |
1161 | } | |
1162 | ||
1163 | /* Reap the advantages of previously found beacons */ | |
1164 | static void reg_process_beacons(struct wiphy *wiphy) | |
1165 | { | |
b1ed8ddd LR |
1166 | /* |
1167 | * Means we are just firing up cfg80211, so no beacons would | |
1168 | * have been processed yet. | |
1169 | */ | |
1170 | if (!last_request) | |
1171 | return; | |
e38f8a7a LR |
1172 | if (!reg_is_world_roaming(wiphy)) |
1173 | return; | |
1174 | wiphy_update_beacon_reg(wiphy); | |
1175 | } | |
1176 | ||
038659e7 LR |
1177 | static bool is_ht40_not_allowed(struct ieee80211_channel *chan) |
1178 | { | |
1179 | if (!chan) | |
1180 | return true; | |
1181 | if (chan->flags & IEEE80211_CHAN_DISABLED) | |
1182 | return true; | |
1183 | /* This would happen when regulatory rules disallow HT40 completely */ | |
1184 | if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) | |
1185 | return true; | |
1186 | return false; | |
1187 | } | |
1188 | ||
1189 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, | |
1190 | enum ieee80211_band band, | |
1191 | unsigned int chan_idx) | |
1192 | { | |
1193 | struct ieee80211_supported_band *sband; | |
1194 | struct ieee80211_channel *channel; | |
1195 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; | |
1196 | unsigned int i; | |
1197 | ||
1198 | assert_cfg80211_lock(); | |
1199 | ||
1200 | sband = wiphy->bands[band]; | |
1201 | BUG_ON(chan_idx >= sband->n_channels); | |
1202 | channel = &sband->channels[chan_idx]; | |
1203 | ||
1204 | if (is_ht40_not_allowed(channel)) { | |
1205 | channel->flags |= IEEE80211_CHAN_NO_HT40; | |
1206 | return; | |
1207 | } | |
1208 | ||
1209 | /* | |
1210 | * We need to ensure the extension channels exist to | |
1211 | * be able to use HT40- or HT40+, this finds them (or not) | |
1212 | */ | |
1213 | for (i = 0; i < sband->n_channels; i++) { | |
1214 | struct ieee80211_channel *c = &sband->channels[i]; | |
1215 | if (c->center_freq == (channel->center_freq - 20)) | |
1216 | channel_before = c; | |
1217 | if (c->center_freq == (channel->center_freq + 20)) | |
1218 | channel_after = c; | |
1219 | } | |
1220 | ||
1221 | /* | |
1222 | * Please note that this assumes target bandwidth is 20 MHz, | |
1223 | * if that ever changes we also need to change the below logic | |
1224 | * to include that as well. | |
1225 | */ | |
1226 | if (is_ht40_not_allowed(channel_before)) | |
689da1b3 | 1227 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 | 1228 | else |
689da1b3 | 1229 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 LR |
1230 | |
1231 | if (is_ht40_not_allowed(channel_after)) | |
689da1b3 | 1232 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 | 1233 | else |
689da1b3 | 1234 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 LR |
1235 | } |
1236 | ||
1237 | static void reg_process_ht_flags_band(struct wiphy *wiphy, | |
1238 | enum ieee80211_band band) | |
1239 | { | |
1240 | unsigned int i; | |
1241 | struct ieee80211_supported_band *sband; | |
1242 | ||
1243 | BUG_ON(!wiphy->bands[band]); | |
1244 | sband = wiphy->bands[band]; | |
1245 | ||
1246 | for (i = 0; i < sband->n_channels; i++) | |
1247 | reg_process_ht_flags_channel(wiphy, band, i); | |
1248 | } | |
1249 | ||
1250 | static void reg_process_ht_flags(struct wiphy *wiphy) | |
1251 | { | |
1252 | enum ieee80211_band band; | |
1253 | ||
1254 | if (!wiphy) | |
1255 | return; | |
1256 | ||
1257 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1258 | if (wiphy->bands[band]) | |
1259 | reg_process_ht_flags_band(wiphy, band); | |
1260 | } | |
1261 | ||
1262 | } | |
1263 | ||
7db90f4a LR |
1264 | void wiphy_update_regulatory(struct wiphy *wiphy, |
1265 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1266 | { |
1267 | enum ieee80211_band band; | |
d46e5b1d | 1268 | |
7db90f4a | 1269 | if (ignore_reg_update(wiphy, initiator)) |
e38f8a7a | 1270 | goto out; |
b2e1b302 | 1271 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1272 | if (wiphy->bands[band]) |
a92a3ce7 | 1273 | handle_band(wiphy, band); |
b2e1b302 | 1274 | } |
e38f8a7a LR |
1275 | out: |
1276 | reg_process_beacons(wiphy); | |
038659e7 | 1277 | reg_process_ht_flags(wiphy); |
560e28e1 | 1278 | if (wiphy->reg_notifier) |
716f9392 | 1279 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1280 | } |
1281 | ||
1fa25e41 LR |
1282 | static void handle_channel_custom(struct wiphy *wiphy, |
1283 | enum ieee80211_band band, | |
1284 | unsigned int chan_idx, | |
1285 | const struct ieee80211_regdomain *regd) | |
1286 | { | |
1287 | int r; | |
038659e7 LR |
1288 | u32 desired_bw_khz = MHZ_TO_KHZ(20); |
1289 | u32 bw_flags = 0; | |
1fa25e41 LR |
1290 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1291 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 1292 | const struct ieee80211_freq_range *freq_range = NULL; |
1fa25e41 LR |
1293 | struct ieee80211_supported_band *sband; |
1294 | struct ieee80211_channel *chan; | |
1295 | ||
ac46d48e LR |
1296 | assert_cfg80211_lock(); |
1297 | ||
1fa25e41 LR |
1298 | sband = wiphy->bands[band]; |
1299 | BUG_ON(chan_idx >= sband->n_channels); | |
1300 | chan = &sband->channels[chan_idx]; | |
1301 | ||
038659e7 LR |
1302 | r = freq_reg_info_regd(wiphy, |
1303 | MHZ_TO_KHZ(chan->center_freq), | |
1304 | desired_bw_khz, | |
1305 | ®_rule, | |
1306 | regd); | |
1fa25e41 LR |
1307 | |
1308 | if (r) { | |
1309 | chan->flags = IEEE80211_CHAN_DISABLED; | |
1310 | return; | |
1311 | } | |
1312 | ||
1313 | power_rule = ®_rule->power_rule; | |
038659e7 LR |
1314 | freq_range = ®_rule->freq_range; |
1315 | ||
1316 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1317 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
1fa25e41 | 1318 | |
038659e7 | 1319 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; |
1fa25e41 | 1320 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); |
038659e7 | 1321 | chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz); |
1fa25e41 LR |
1322 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
1323 | } | |
1324 | ||
1325 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1326 | const struct ieee80211_regdomain *regd) | |
1327 | { | |
1328 | unsigned int i; | |
1329 | struct ieee80211_supported_band *sband; | |
1330 | ||
1331 | BUG_ON(!wiphy->bands[band]); | |
1332 | sband = wiphy->bands[band]; | |
1333 | ||
1334 | for (i = 0; i < sband->n_channels; i++) | |
1335 | handle_channel_custom(wiphy, band, i, regd); | |
1336 | } | |
1337 | ||
1338 | /* Used by drivers prior to wiphy registration */ | |
1339 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1340 | const struct ieee80211_regdomain *regd) | |
1341 | { | |
1342 | enum ieee80211_band band; | |
bbcf3f02 | 1343 | unsigned int bands_set = 0; |
ac46d48e LR |
1344 | |
1345 | mutex_lock(&cfg80211_mutex); | |
1fa25e41 | 1346 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
bbcf3f02 LR |
1347 | if (!wiphy->bands[band]) |
1348 | continue; | |
1349 | handle_band_custom(wiphy, band, regd); | |
1350 | bands_set++; | |
b2e1b302 | 1351 | } |
ac46d48e | 1352 | mutex_unlock(&cfg80211_mutex); |
bbcf3f02 LR |
1353 | |
1354 | /* | |
1355 | * no point in calling this if it won't have any effect | |
1356 | * on your device's supportd bands. | |
1357 | */ | |
1358 | WARN_ON(!bands_set); | |
b2e1b302 | 1359 | } |
1fa25e41 LR |
1360 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1361 | ||
3e0c3ff3 LR |
1362 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
1363 | const struct ieee80211_regdomain *src_regd) | |
1364 | { | |
1365 | struct ieee80211_regdomain *regd; | |
1366 | int size_of_regd = 0; | |
1367 | unsigned int i; | |
1368 | ||
1369 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1370 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
1371 | ||
1372 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
1373 | if (!regd) | |
1374 | return -ENOMEM; | |
1375 | ||
1376 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
1377 | ||
1378 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
1379 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
1380 | sizeof(struct ieee80211_reg_rule)); | |
1381 | ||
1382 | *dst_regd = regd; | |
1383 | return 0; | |
1384 | } | |
b2e1b302 | 1385 | |
fb1fc7ad LR |
1386 | /* |
1387 | * Return value which can be used by ignore_request() to indicate | |
1388 | * it has been determined we should intersect two regulatory domains | |
1389 | */ | |
9c96477d LR |
1390 | #define REG_INTERSECT 1 |
1391 | ||
84fa4f43 JB |
1392 | /* This has the logic which determines when a new request |
1393 | * should be ignored. */ | |
2f92cd2e LR |
1394 | static int ignore_request(struct wiphy *wiphy, |
1395 | struct regulatory_request *pending_request) | |
84fa4f43 | 1396 | { |
806a9e39 | 1397 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1398 | |
1399 | assert_cfg80211_lock(); | |
1400 | ||
84fa4f43 JB |
1401 | /* All initial requests are respected */ |
1402 | if (!last_request) | |
1403 | return 0; | |
1404 | ||
2f92cd2e | 1405 | switch (pending_request->initiator) { |
7db90f4a | 1406 | case NL80211_REGDOM_SET_BY_CORE: |
ba25c141 | 1407 | return -EINVAL; |
7db90f4a | 1408 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1409 | |
1410 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1411 | ||
2f92cd2e | 1412 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1413 | return -EINVAL; |
7db90f4a LR |
1414 | if (last_request->initiator == |
1415 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1416 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1417 | /* |
1418 | * Two cards with two APs claiming different | |
1419 | * different Country IE alpha2s. We could | |
1420 | * intersect them, but that seems unlikely | |
1421 | * to be correct. Reject second one for now. | |
1422 | */ | |
2f92cd2e | 1423 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1424 | return -EOPNOTSUPP; |
1425 | return -EALREADY; | |
1426 | } | |
fb1fc7ad LR |
1427 | /* |
1428 | * Two consecutive Country IE hints on the same wiphy. | |
1429 | * This should be picked up early by the driver/stack | |
1430 | */ | |
2f92cd2e | 1431 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1432 | return 0; |
1433 | return -EALREADY; | |
1434 | } | |
3f2355cb | 1435 | return REG_INTERSECT; |
7db90f4a LR |
1436 | case NL80211_REGDOM_SET_BY_DRIVER: |
1437 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
e74b1e7f LR |
1438 | if (is_old_static_regdom(cfg80211_regdomain)) |
1439 | return 0; | |
2f92cd2e | 1440 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1441 | return 0; |
84fa4f43 | 1442 | return -EALREADY; |
e74b1e7f | 1443 | } |
fff32c04 LR |
1444 | |
1445 | /* | |
1446 | * This would happen if you unplug and plug your card | |
1447 | * back in or if you add a new device for which the previously | |
1448 | * loaded card also agrees on the regulatory domain. | |
1449 | */ | |
7db90f4a | 1450 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1451 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1452 | return -EALREADY; |
1453 | ||
3e0c3ff3 | 1454 | return REG_INTERSECT; |
7db90f4a LR |
1455 | case NL80211_REGDOM_SET_BY_USER: |
1456 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1457 | return REG_INTERSECT; |
fb1fc7ad LR |
1458 | /* |
1459 | * If the user knows better the user should set the regdom | |
1460 | * to their country before the IE is picked up | |
1461 | */ | |
7db90f4a | 1462 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1463 | last_request->intersect) |
1464 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1465 | /* |
1466 | * Process user requests only after previous user/driver/core | |
1467 | * requests have been processed | |
1468 | */ | |
7db90f4a LR |
1469 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1470 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1471 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
69b1572b | 1472 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1473 | return -EAGAIN; |
1474 | } | |
1475 | ||
e74b1e7f | 1476 | if (!is_old_static_regdom(cfg80211_regdomain) && |
2f92cd2e | 1477 | !regdom_changes(pending_request->alpha2)) |
e74b1e7f LR |
1478 | return -EALREADY; |
1479 | ||
84fa4f43 JB |
1480 | return 0; |
1481 | } | |
1482 | ||
1483 | return -EINVAL; | |
1484 | } | |
1485 | ||
d1c96a9a LR |
1486 | /** |
1487 | * __regulatory_hint - hint to the wireless core a regulatory domain | |
1488 | * @wiphy: if the hint comes from country information from an AP, this | |
1489 | * is required to be set to the wiphy that received the information | |
28da32d7 | 1490 | * @pending_request: the regulatory request currently being processed |
d1c96a9a LR |
1491 | * |
1492 | * The Wireless subsystem can use this function to hint to the wireless core | |
28da32d7 | 1493 | * what it believes should be the current regulatory domain. |
d1c96a9a LR |
1494 | * |
1495 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1496 | * already been set or other standard error codes. | |
1497 | * | |
1498 | * Caller must hold &cfg80211_mutex | |
1499 | */ | |
28da32d7 LR |
1500 | static int __regulatory_hint(struct wiphy *wiphy, |
1501 | struct regulatory_request *pending_request) | |
b2e1b302 | 1502 | { |
9c96477d | 1503 | bool intersect = false; |
b2e1b302 LR |
1504 | int r = 0; |
1505 | ||
761cf7ec LR |
1506 | assert_cfg80211_lock(); |
1507 | ||
2f92cd2e | 1508 | r = ignore_request(wiphy, pending_request); |
9c96477d | 1509 | |
3e0c3ff3 | 1510 | if (r == REG_INTERSECT) { |
7db90f4a LR |
1511 | if (pending_request->initiator == |
1512 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1513 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1514 | if (r) { |
1515 | kfree(pending_request); | |
3e0c3ff3 | 1516 | return r; |
d951c1dd | 1517 | } |
3e0c3ff3 | 1518 | } |
9c96477d | 1519 | intersect = true; |
3e0c3ff3 | 1520 | } else if (r) { |
fb1fc7ad LR |
1521 | /* |
1522 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1523 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1524 | * wiphy |
1525 | */ | |
28da32d7 | 1526 | if (r == -EALREADY && |
7db90f4a LR |
1527 | pending_request->initiator == |
1528 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1529 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1530 | if (r) { |
1531 | kfree(pending_request); | |
3e0c3ff3 | 1532 | return r; |
d951c1dd | 1533 | } |
3e0c3ff3 LR |
1534 | r = -EALREADY; |
1535 | goto new_request; | |
1536 | } | |
d951c1dd | 1537 | kfree(pending_request); |
b2e1b302 | 1538 | return r; |
3e0c3ff3 | 1539 | } |
b2e1b302 | 1540 | |
3e0c3ff3 | 1541 | new_request: |
d951c1dd | 1542 | kfree(last_request); |
5203cdb6 | 1543 | |
d951c1dd LR |
1544 | last_request = pending_request; |
1545 | last_request->intersect = intersect; | |
5203cdb6 | 1546 | |
d951c1dd | 1547 | pending_request = NULL; |
3e0c3ff3 LR |
1548 | |
1549 | /* When r == REG_INTERSECT we do need to call CRDA */ | |
73d54c9e LR |
1550 | if (r < 0) { |
1551 | /* | |
1552 | * Since CRDA will not be called in this case as we already | |
1553 | * have applied the requested regulatory domain before we just | |
1554 | * inform userspace we have processed the request | |
1555 | */ | |
1556 | if (r == -EALREADY) | |
1557 | nl80211_send_reg_change_event(last_request); | |
3e0c3ff3 | 1558 | return r; |
73d54c9e | 1559 | } |
3e0c3ff3 | 1560 | |
d951c1dd | 1561 | return call_crda(last_request->alpha2); |
b2e1b302 LR |
1562 | } |
1563 | ||
30a548c7 | 1564 | /* This processes *all* regulatory hints */ |
d951c1dd | 1565 | static void reg_process_hint(struct regulatory_request *reg_request) |
fe33eb39 LR |
1566 | { |
1567 | int r = 0; | |
1568 | struct wiphy *wiphy = NULL; | |
1569 | ||
1570 | BUG_ON(!reg_request->alpha2); | |
1571 | ||
1572 | mutex_lock(&cfg80211_mutex); | |
1573 | ||
1574 | if (wiphy_idx_valid(reg_request->wiphy_idx)) | |
1575 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1576 | ||
7db90f4a | 1577 | if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
fe33eb39 | 1578 | !wiphy) { |
d951c1dd | 1579 | kfree(reg_request); |
fe33eb39 LR |
1580 | goto out; |
1581 | } | |
1582 | ||
28da32d7 | 1583 | r = __regulatory_hint(wiphy, reg_request); |
fe33eb39 LR |
1584 | /* This is required so that the orig_* parameters are saved */ |
1585 | if (r == -EALREADY && wiphy && wiphy->strict_regulatory) | |
1586 | wiphy_update_regulatory(wiphy, reg_request->initiator); | |
1587 | out: | |
1588 | mutex_unlock(&cfg80211_mutex); | |
fe33eb39 LR |
1589 | } |
1590 | ||
7db90f4a | 1591 | /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */ |
fe33eb39 LR |
1592 | static void reg_process_pending_hints(void) |
1593 | { | |
1594 | struct regulatory_request *reg_request; | |
fe33eb39 LR |
1595 | |
1596 | spin_lock(®_requests_lock); | |
1597 | while (!list_empty(®_requests_list)) { | |
1598 | reg_request = list_first_entry(®_requests_list, | |
1599 | struct regulatory_request, | |
1600 | list); | |
1601 | list_del_init(®_request->list); | |
fe33eb39 | 1602 | |
d951c1dd LR |
1603 | spin_unlock(®_requests_lock); |
1604 | reg_process_hint(reg_request); | |
fe33eb39 LR |
1605 | spin_lock(®_requests_lock); |
1606 | } | |
1607 | spin_unlock(®_requests_lock); | |
1608 | } | |
1609 | ||
e38f8a7a LR |
1610 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1611 | static void reg_process_pending_beacon_hints(void) | |
1612 | { | |
79c97e97 | 1613 | struct cfg80211_registered_device *rdev; |
e38f8a7a LR |
1614 | struct reg_beacon *pending_beacon, *tmp; |
1615 | ||
1616 | mutex_lock(&cfg80211_mutex); | |
1617 | ||
1618 | /* This goes through the _pending_ beacon list */ | |
1619 | spin_lock_bh(®_pending_beacons_lock); | |
1620 | ||
1621 | if (list_empty(®_pending_beacons)) { | |
1622 | spin_unlock_bh(®_pending_beacons_lock); | |
1623 | goto out; | |
1624 | } | |
1625 | ||
1626 | list_for_each_entry_safe(pending_beacon, tmp, | |
1627 | ®_pending_beacons, list) { | |
1628 | ||
1629 | list_del_init(&pending_beacon->list); | |
1630 | ||
1631 | /* Applies the beacon hint to current wiphys */ | |
79c97e97 JB |
1632 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1633 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); | |
e38f8a7a LR |
1634 | |
1635 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
1636 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
1637 | } | |
1638 | ||
1639 | spin_unlock_bh(®_pending_beacons_lock); | |
1640 | out: | |
1641 | mutex_unlock(&cfg80211_mutex); | |
1642 | } | |
1643 | ||
fe33eb39 LR |
1644 | static void reg_todo(struct work_struct *work) |
1645 | { | |
1646 | reg_process_pending_hints(); | |
e38f8a7a | 1647 | reg_process_pending_beacon_hints(); |
fe33eb39 LR |
1648 | } |
1649 | ||
1650 | static DECLARE_WORK(reg_work, reg_todo); | |
1651 | ||
1652 | static void queue_regulatory_request(struct regulatory_request *request) | |
1653 | { | |
1654 | spin_lock(®_requests_lock); | |
1655 | list_add_tail(&request->list, ®_requests_list); | |
1656 | spin_unlock(®_requests_lock); | |
1657 | ||
1658 | schedule_work(®_work); | |
1659 | } | |
1660 | ||
1661 | /* Core regulatory hint -- happens once during cfg80211_init() */ | |
ba25c141 LR |
1662 | static int regulatory_hint_core(const char *alpha2) |
1663 | { | |
1664 | struct regulatory_request *request; | |
1665 | ||
1666 | BUG_ON(last_request); | |
1667 | ||
1668 | request = kzalloc(sizeof(struct regulatory_request), | |
1669 | GFP_KERNEL); | |
1670 | if (!request) | |
1671 | return -ENOMEM; | |
1672 | ||
1673 | request->alpha2[0] = alpha2[0]; | |
1674 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1675 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
ba25c141 | 1676 | |
fe33eb39 | 1677 | queue_regulatory_request(request); |
ba25c141 | 1678 | |
5078b2e3 LR |
1679 | /* |
1680 | * This ensures last_request is populated once modules | |
1681 | * come swinging in and calling regulatory hints and | |
1682 | * wiphy_apply_custom_regulatory(). | |
1683 | */ | |
1684 | flush_scheduled_work(); | |
1685 | ||
fe33eb39 | 1686 | return 0; |
ba25c141 LR |
1687 | } |
1688 | ||
fe33eb39 LR |
1689 | /* User hints */ |
1690 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1691 | { |
fe33eb39 LR |
1692 | struct regulatory_request *request; |
1693 | ||
be3d4810 | 1694 | BUG_ON(!alpha2); |
b2e1b302 | 1695 | |
fe33eb39 LR |
1696 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1697 | if (!request) | |
1698 | return -ENOMEM; | |
1699 | ||
1700 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1701 | request->alpha2[0] = alpha2[0]; | |
1702 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1703 | request->initiator = NL80211_REGDOM_SET_BY_USER, |
fe33eb39 LR |
1704 | |
1705 | queue_regulatory_request(request); | |
1706 | ||
1707 | return 0; | |
1708 | } | |
1709 | ||
1710 | /* Driver hints */ | |
1711 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1712 | { | |
1713 | struct regulatory_request *request; | |
1714 | ||
1715 | BUG_ON(!alpha2); | |
1716 | BUG_ON(!wiphy); | |
1717 | ||
1718 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1719 | if (!request) | |
1720 | return -ENOMEM; | |
1721 | ||
1722 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1723 | ||
1724 | /* Must have registered wiphy first */ | |
1725 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1726 | ||
1727 | request->alpha2[0] = alpha2[0]; | |
1728 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1729 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
fe33eb39 LR |
1730 | |
1731 | queue_regulatory_request(request); | |
1732 | ||
1733 | return 0; | |
b2e1b302 LR |
1734 | } |
1735 | EXPORT_SYMBOL(regulatory_hint); | |
1736 | ||
3f2355cb LR |
1737 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, |
1738 | u32 country_ie_checksum) | |
1739 | { | |
806a9e39 LR |
1740 | struct wiphy *request_wiphy; |
1741 | ||
761cf7ec LR |
1742 | assert_cfg80211_lock(); |
1743 | ||
cc0b6fe8 LR |
1744 | if (unlikely(last_request->initiator != |
1745 | NL80211_REGDOM_SET_BY_COUNTRY_IE)) | |
1746 | return false; | |
1747 | ||
806a9e39 LR |
1748 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1749 | ||
1750 | if (!request_wiphy) | |
3f2355cb | 1751 | return false; |
806a9e39 LR |
1752 | |
1753 | if (likely(request_wiphy != wiphy)) | |
3f2355cb | 1754 | return !country_ie_integrity_changes(country_ie_checksum); |
fb1fc7ad LR |
1755 | /* |
1756 | * We should not have let these through at this point, they | |
3f2355cb | 1757 | * should have been picked up earlier by the first alpha2 check |
fb1fc7ad LR |
1758 | * on the device |
1759 | */ | |
3f2355cb LR |
1760 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) |
1761 | return true; | |
1762 | return false; | |
1763 | } | |
1764 | ||
1765 | void regulatory_hint_11d(struct wiphy *wiphy, | |
1766 | u8 *country_ie, | |
1767 | u8 country_ie_len) | |
1768 | { | |
1769 | struct ieee80211_regdomain *rd = NULL; | |
1770 | char alpha2[2]; | |
1771 | u32 checksum = 0; | |
1772 | enum environment_cap env = ENVIRON_ANY; | |
fe33eb39 | 1773 | struct regulatory_request *request; |
3f2355cb | 1774 | |
a1794390 | 1775 | mutex_lock(&cfg80211_mutex); |
3f2355cb | 1776 | |
d335fe63 LR |
1777 | if (unlikely(!last_request)) { |
1778 | mutex_unlock(&cfg80211_mutex); | |
1779 | return; | |
1780 | } | |
1781 | ||
3f2355cb LR |
1782 | /* IE len must be evenly divisible by 2 */ |
1783 | if (country_ie_len & 0x01) | |
1784 | goto out; | |
1785 | ||
1786 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1787 | goto out; | |
1788 | ||
fb1fc7ad LR |
1789 | /* |
1790 | * Pending country IE processing, this can happen after we | |
3f2355cb | 1791 | * call CRDA and wait for a response if a beacon was received before |
fb1fc7ad LR |
1792 | * we were able to process the last regulatory_hint_11d() call |
1793 | */ | |
3f2355cb LR |
1794 | if (country_ie_regdomain) |
1795 | goto out; | |
1796 | ||
1797 | alpha2[0] = country_ie[0]; | |
1798 | alpha2[1] = country_ie[1]; | |
1799 | ||
1800 | if (country_ie[2] == 'I') | |
1801 | env = ENVIRON_INDOOR; | |
1802 | else if (country_ie[2] == 'O') | |
1803 | env = ENVIRON_OUTDOOR; | |
1804 | ||
fb1fc7ad LR |
1805 | /* |
1806 | * We will run this for *every* beacon processed for the BSSID, so | |
3f2355cb | 1807 | * we optimize an early check to exit out early if we don't have to |
fb1fc7ad LR |
1808 | * do anything |
1809 | */ | |
cc0b6fe8 LR |
1810 | if (likely(last_request->initiator == |
1811 | NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1812 | wiphy_idx_valid(last_request->wiphy_idx))) { | |
79c97e97 | 1813 | struct cfg80211_registered_device *rdev_last_ie; |
3f2355cb | 1814 | |
79c97e97 JB |
1815 | rdev_last_ie = |
1816 | cfg80211_rdev_by_wiphy_idx(last_request->wiphy_idx); | |
3f2355cb | 1817 | |
fb1fc7ad LR |
1818 | /* |
1819 | * Lets keep this simple -- we trust the first AP | |
1820 | * after we intersect with CRDA | |
1821 | */ | |
79c97e97 | 1822 | if (likely(&rdev_last_ie->wiphy == wiphy)) { |
fb1fc7ad LR |
1823 | /* |
1824 | * Ignore IEs coming in on this wiphy with | |
1825 | * the same alpha2 and environment cap | |
1826 | */ | |
79c97e97 | 1827 | if (likely(alpha2_equal(rdev_last_ie->country_ie_alpha2, |
3f2355cb | 1828 | alpha2) && |
79c97e97 | 1829 | env == rdev_last_ie->env)) { |
3f2355cb LR |
1830 | goto out; |
1831 | } | |
fb1fc7ad LR |
1832 | /* |
1833 | * the wiphy moved on to another BSSID or the AP | |
3f2355cb LR |
1834 | * was reconfigured. XXX: We need to deal with the |
1835 | * case where the user suspends and goes to goes | |
1836 | * to another country, and then gets IEs from an | |
fb1fc7ad LR |
1837 | * AP with different settings |
1838 | */ | |
3f2355cb LR |
1839 | goto out; |
1840 | } else { | |
fb1fc7ad LR |
1841 | /* |
1842 | * Ignore IEs coming in on two separate wiphys with | |
1843 | * the same alpha2 and environment cap | |
1844 | */ | |
79c97e97 | 1845 | if (likely(alpha2_equal(rdev_last_ie->country_ie_alpha2, |
3f2355cb | 1846 | alpha2) && |
79c97e97 | 1847 | env == rdev_last_ie->env)) { |
3f2355cb LR |
1848 | goto out; |
1849 | } | |
1850 | /* We could potentially intersect though */ | |
1851 | goto out; | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); | |
1856 | if (!rd) | |
1857 | goto out; | |
1858 | ||
915278e0 LR |
1859 | /* |
1860 | * This will not happen right now but we leave it here for the | |
3f2355cb LR |
1861 | * the future when we want to add suspend/resume support and having |
1862 | * the user move to another country after doing so, or having the user | |
915278e0 LR |
1863 | * move to another AP. Right now we just trust the first AP. |
1864 | * | |
1865 | * If we hit this before we add this support we want to be informed of | |
1866 | * it as it would indicate a mistake in the current design | |
1867 | */ | |
1868 | if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum))) | |
0441d6ff | 1869 | goto free_rd_out; |
3f2355cb | 1870 | |
fe33eb39 LR |
1871 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1872 | if (!request) | |
1873 | goto free_rd_out; | |
1874 | ||
fb1fc7ad LR |
1875 | /* |
1876 | * We keep this around for when CRDA comes back with a response so | |
1877 | * we can intersect with that | |
1878 | */ | |
3f2355cb LR |
1879 | country_ie_regdomain = rd; |
1880 | ||
fe33eb39 LR |
1881 | request->wiphy_idx = get_wiphy_idx(wiphy); |
1882 | request->alpha2[0] = rd->alpha2[0]; | |
1883 | request->alpha2[1] = rd->alpha2[1]; | |
7db90f4a | 1884 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
fe33eb39 LR |
1885 | request->country_ie_checksum = checksum; |
1886 | request->country_ie_env = env; | |
1887 | ||
1888 | mutex_unlock(&cfg80211_mutex); | |
3f2355cb | 1889 | |
fe33eb39 LR |
1890 | queue_regulatory_request(request); |
1891 | ||
1892 | return; | |
0441d6ff LR |
1893 | |
1894 | free_rd_out: | |
1895 | kfree(rd); | |
3f2355cb | 1896 | out: |
a1794390 | 1897 | mutex_unlock(&cfg80211_mutex); |
3f2355cb LR |
1898 | } |
1899 | EXPORT_SYMBOL(regulatory_hint_11d); | |
b2e1b302 | 1900 | |
e38f8a7a LR |
1901 | static bool freq_is_chan_12_13_14(u16 freq) |
1902 | { | |
1903 | if (freq == ieee80211_channel_to_frequency(12) || | |
1904 | freq == ieee80211_channel_to_frequency(13) || | |
1905 | freq == ieee80211_channel_to_frequency(14)) | |
1906 | return true; | |
1907 | return false; | |
1908 | } | |
1909 | ||
1910 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
1911 | struct ieee80211_channel *beacon_chan, | |
1912 | gfp_t gfp) | |
1913 | { | |
1914 | struct reg_beacon *reg_beacon; | |
1915 | ||
1916 | if (likely((beacon_chan->beacon_found || | |
1917 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || | |
1918 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
1919 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) | |
1920 | return 0; | |
1921 | ||
1922 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
1923 | if (!reg_beacon) | |
1924 | return -ENOMEM; | |
1925 | ||
1926 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1927 | printk(KERN_DEBUG "cfg80211: Found new beacon on " | |
1928 | "frequency: %d MHz (Ch %d) on %s\n", | |
1929 | beacon_chan->center_freq, | |
1930 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
1931 | wiphy_name(wiphy)); | |
1932 | #endif | |
1933 | memcpy(®_beacon->chan, beacon_chan, | |
1934 | sizeof(struct ieee80211_channel)); | |
1935 | ||
1936 | ||
1937 | /* | |
1938 | * Since we can be called from BH or and non-BH context | |
1939 | * we must use spin_lock_bh() | |
1940 | */ | |
1941 | spin_lock_bh(®_pending_beacons_lock); | |
1942 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
1943 | spin_unlock_bh(®_pending_beacons_lock); | |
1944 | ||
1945 | schedule_work(®_work); | |
1946 | ||
1947 | return 0; | |
1948 | } | |
1949 | ||
a3d2eaf0 | 1950 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1951 | { |
1952 | unsigned int i; | |
a3d2eaf0 JB |
1953 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1954 | const struct ieee80211_freq_range *freq_range = NULL; | |
1955 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
1956 | |
1957 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
1958 | "(max_antenna_gain, max_eirp)\n"); | |
1959 | ||
1960 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1961 | reg_rule = &rd->reg_rules[i]; | |
1962 | freq_range = ®_rule->freq_range; | |
1963 | power_rule = ®_rule->power_rule; | |
1964 | ||
fb1fc7ad LR |
1965 | /* |
1966 | * There may not be documentation for max antenna gain | |
1967 | * in certain regions | |
1968 | */ | |
b2e1b302 LR |
1969 | if (power_rule->max_antenna_gain) |
1970 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1971 | "(%d mBi, %d mBm)\n", | |
1972 | freq_range->start_freq_khz, | |
1973 | freq_range->end_freq_khz, | |
1974 | freq_range->max_bandwidth_khz, | |
1975 | power_rule->max_antenna_gain, | |
1976 | power_rule->max_eirp); | |
1977 | else | |
1978 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1979 | "(N/A, %d mBm)\n", | |
1980 | freq_range->start_freq_khz, | |
1981 | freq_range->end_freq_khz, | |
1982 | freq_range->max_bandwidth_khz, | |
1983 | power_rule->max_eirp); | |
1984 | } | |
1985 | } | |
1986 | ||
a3d2eaf0 | 1987 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1988 | { |
1989 | ||
3f2355cb | 1990 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 1991 | |
7db90f4a LR |
1992 | if (last_request->initiator == |
1993 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
79c97e97 JB |
1994 | struct cfg80211_registered_device *rdev; |
1995 | rdev = cfg80211_rdev_by_wiphy_idx( | |
806a9e39 | 1996 | last_request->wiphy_idx); |
79c97e97 | 1997 | if (rdev) { |
3f2355cb LR |
1998 | printk(KERN_INFO "cfg80211: Current regulatory " |
1999 | "domain updated by AP to: %c%c\n", | |
79c97e97 JB |
2000 | rdev->country_ie_alpha2[0], |
2001 | rdev->country_ie_alpha2[1]); | |
3f2355cb LR |
2002 | } else |
2003 | printk(KERN_INFO "cfg80211: Current regulatory " | |
2004 | "domain intersected: \n"); | |
2005 | } else | |
2006 | printk(KERN_INFO "cfg80211: Current regulatory " | |
039498c6 | 2007 | "domain intersected: \n"); |
3f2355cb | 2008 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
2009 | printk(KERN_INFO "cfg80211: World regulatory " |
2010 | "domain updated:\n"); | |
2011 | else { | |
2012 | if (is_unknown_alpha2(rd->alpha2)) | |
2013 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
2014 | "changed to driver built-in settings " | |
2015 | "(unknown country)\n"); | |
2016 | else | |
2017 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
2018 | "changed to country: %c%c\n", | |
2019 | rd->alpha2[0], rd->alpha2[1]); | |
2020 | } | |
2021 | print_rd_rules(rd); | |
2022 | } | |
2023 | ||
2df78167 | 2024 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
2025 | { |
2026 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
2027 | rd->alpha2[0], rd->alpha2[1]); | |
2028 | print_rd_rules(rd); | |
2029 | } | |
2030 | ||
3f2355cb LR |
2031 | #ifdef CONFIG_CFG80211_REG_DEBUG |
2032 | static void reg_country_ie_process_debug( | |
2033 | const struct ieee80211_regdomain *rd, | |
2034 | const struct ieee80211_regdomain *country_ie_regdomain, | |
2035 | const struct ieee80211_regdomain *intersected_rd) | |
2036 | { | |
2037 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
2038 | print_regdomain_info(country_ie_regdomain); | |
2039 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
2040 | print_regdomain_info(rd); | |
2041 | if (intersected_rd) { | |
2042 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
2043 | "and get:\n"); | |
667ecd01 | 2044 | print_regdomain_info(intersected_rd); |
3f2355cb LR |
2045 | return; |
2046 | } | |
2047 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
2048 | } | |
2049 | #else | |
2050 | static inline void reg_country_ie_process_debug( | |
2051 | const struct ieee80211_regdomain *rd, | |
2052 | const struct ieee80211_regdomain *country_ie_regdomain, | |
2053 | const struct ieee80211_regdomain *intersected_rd) | |
2054 | { | |
2055 | } | |
2056 | #endif | |
2057 | ||
d2372b31 | 2058 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 2059 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2060 | { |
9c96477d | 2061 | const struct ieee80211_regdomain *intersected_rd = NULL; |
79c97e97 | 2062 | struct cfg80211_registered_device *rdev = NULL; |
806a9e39 | 2063 | struct wiphy *request_wiphy; |
b2e1b302 LR |
2064 | /* Some basic sanity checks first */ |
2065 | ||
b2e1b302 | 2066 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 2067 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2068 | return -EINVAL; |
2069 | update_world_regdomain(rd); | |
2070 | return 0; | |
2071 | } | |
b2e1b302 LR |
2072 | |
2073 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
2074 | !is_unknown_alpha2(rd->alpha2)) | |
2075 | return -EINVAL; | |
2076 | ||
f6037d09 | 2077 | if (!last_request) |
b2e1b302 LR |
2078 | return -EINVAL; |
2079 | ||
fb1fc7ad LR |
2080 | /* |
2081 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 2082 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
2083 | * and the pending request came in from a country IE |
2084 | */ | |
7db90f4a | 2085 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
2086 | /* |
2087 | * If someone else asked us to change the rd lets only bother | |
2088 | * checking if the alpha2 changes if CRDA was already called | |
2089 | */ | |
3f2355cb | 2090 | if (!is_old_static_regdom(cfg80211_regdomain) && |
69b1572b | 2091 | !regdom_changes(rd->alpha2)) |
3f2355cb LR |
2092 | return -EINVAL; |
2093 | } | |
2094 | ||
fb1fc7ad LR |
2095 | /* |
2096 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
2097 | * and finally inform them of what we have done, in case they want |
2098 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
2099 | * internal EEPROM data |
2100 | */ | |
b2e1b302 | 2101 | |
f6037d09 | 2102 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2103 | return -EINVAL; |
2104 | ||
8375af3b LR |
2105 | if (!is_valid_rd(rd)) { |
2106 | printk(KERN_ERR "cfg80211: Invalid " | |
2107 | "regulatory domain detected:\n"); | |
2108 | print_regdomain_info(rd); | |
2109 | return -EINVAL; | |
b2e1b302 LR |
2110 | } |
2111 | ||
806a9e39 LR |
2112 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
2113 | ||
b8295acd | 2114 | if (!last_request->intersect) { |
3e0c3ff3 LR |
2115 | int r; |
2116 | ||
7db90f4a | 2117 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
3e0c3ff3 LR |
2118 | reset_regdomains(); |
2119 | cfg80211_regdomain = rd; | |
2120 | return 0; | |
2121 | } | |
2122 | ||
fb1fc7ad LR |
2123 | /* |
2124 | * For a driver hint, lets copy the regulatory domain the | |
2125 | * driver wanted to the wiphy to deal with conflicts | |
2126 | */ | |
3e0c3ff3 | 2127 | |
558f6d32 LR |
2128 | /* |
2129 | * Userspace could have sent two replies with only | |
2130 | * one kernel request. | |
2131 | */ | |
2132 | if (request_wiphy->regd) | |
2133 | return -EALREADY; | |
3e0c3ff3 | 2134 | |
806a9e39 | 2135 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
2136 | if (r) |
2137 | return r; | |
2138 | ||
b8295acd LR |
2139 | reset_regdomains(); |
2140 | cfg80211_regdomain = rd; | |
2141 | return 0; | |
2142 | } | |
2143 | ||
2144 | /* Intersection requires a bit more work */ | |
2145 | ||
7db90f4a | 2146 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 2147 | |
9c96477d LR |
2148 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
2149 | if (!intersected_rd) | |
2150 | return -EINVAL; | |
b8295acd | 2151 | |
fb1fc7ad LR |
2152 | /* |
2153 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 2154 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
2155 | * domain we keep it for its private use |
2156 | */ | |
7db90f4a | 2157 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 2158 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
2159 | else |
2160 | kfree(rd); | |
2161 | ||
b8295acd LR |
2162 | rd = NULL; |
2163 | ||
2164 | reset_regdomains(); | |
2165 | cfg80211_regdomain = intersected_rd; | |
2166 | ||
2167 | return 0; | |
9c96477d LR |
2168 | } |
2169 | ||
3f2355cb LR |
2170 | /* |
2171 | * Country IE requests are handled a bit differently, we intersect | |
2172 | * the country IE rd with what CRDA believes that country should have | |
2173 | */ | |
2174 | ||
729e9c76 LR |
2175 | /* |
2176 | * Userspace could have sent two replies with only | |
2177 | * one kernel request. By the second reply we would have | |
2178 | * already processed and consumed the country_ie_regdomain. | |
2179 | */ | |
2180 | if (!country_ie_regdomain) | |
2181 | return -EALREADY; | |
86f04680 | 2182 | BUG_ON(rd == country_ie_regdomain); |
3f2355cb | 2183 | |
86f04680 LR |
2184 | /* |
2185 | * Intersect what CRDA returned and our what we | |
2186 | * had built from the Country IE received | |
2187 | */ | |
3f2355cb | 2188 | |
86f04680 | 2189 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); |
3f2355cb | 2190 | |
86f04680 LR |
2191 | reg_country_ie_process_debug(rd, |
2192 | country_ie_regdomain, | |
2193 | intersected_rd); | |
3f2355cb | 2194 | |
86f04680 LR |
2195 | kfree(country_ie_regdomain); |
2196 | country_ie_regdomain = NULL; | |
3f2355cb LR |
2197 | |
2198 | if (!intersected_rd) | |
2199 | return -EINVAL; | |
2200 | ||
79c97e97 | 2201 | rdev = wiphy_to_dev(request_wiphy); |
3f2355cb | 2202 | |
79c97e97 JB |
2203 | rdev->country_ie_alpha2[0] = rd->alpha2[0]; |
2204 | rdev->country_ie_alpha2[1] = rd->alpha2[1]; | |
2205 | rdev->env = last_request->country_ie_env; | |
3f2355cb LR |
2206 | |
2207 | BUG_ON(intersected_rd == rd); | |
2208 | ||
2209 | kfree(rd); | |
2210 | rd = NULL; | |
2211 | ||
b8295acd | 2212 | reset_regdomains(); |
3f2355cb | 2213 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2214 | |
2215 | return 0; | |
2216 | } | |
2217 | ||
2218 | ||
fb1fc7ad LR |
2219 | /* |
2220 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2221 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2222 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2223 | */ | |
a3d2eaf0 | 2224 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2225 | { |
b2e1b302 LR |
2226 | int r; |
2227 | ||
761cf7ec LR |
2228 | assert_cfg80211_lock(); |
2229 | ||
b2e1b302 LR |
2230 | /* Note that this doesn't update the wiphys, this is done below */ |
2231 | r = __set_regdom(rd); | |
d2372b31 JB |
2232 | if (r) { |
2233 | kfree(rd); | |
b2e1b302 | 2234 | return r; |
d2372b31 | 2235 | } |
b2e1b302 | 2236 | |
b2e1b302 | 2237 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2238 | if (!last_request->intersect) |
2239 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2240 | |
2241 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2242 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2243 | |
a01ddafd | 2244 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2245 | |
73d54c9e LR |
2246 | nl80211_send_reg_change_event(last_request); |
2247 | ||
b2e1b302 LR |
2248 | return r; |
2249 | } | |
2250 | ||
a1794390 | 2251 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2252 | void reg_device_remove(struct wiphy *wiphy) |
2253 | { | |
0ad8acaf | 2254 | struct wiphy *request_wiphy = NULL; |
806a9e39 | 2255 | |
761cf7ec LR |
2256 | assert_cfg80211_lock(); |
2257 | ||
0ef9ccdd CW |
2258 | kfree(wiphy->regd); |
2259 | ||
0ad8acaf LR |
2260 | if (last_request) |
2261 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
806a9e39 | 2262 | |
0ef9ccdd | 2263 | if (!request_wiphy || request_wiphy != wiphy) |
3f2355cb | 2264 | return; |
0ef9ccdd | 2265 | |
806a9e39 | 2266 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb LR |
2267 | last_request->country_ie_env = ENVIRON_ANY; |
2268 | } | |
2269 | ||
b2e1b302 LR |
2270 | int regulatory_init(void) |
2271 | { | |
bcf4f99b | 2272 | int err = 0; |
734366de | 2273 | |
b2e1b302 LR |
2274 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2275 | if (IS_ERR(reg_pdev)) | |
2276 | return PTR_ERR(reg_pdev); | |
734366de | 2277 | |
fe33eb39 | 2278 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2279 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2280 | |
734366de | 2281 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY |
a3d2eaf0 | 2282 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 2283 | |
942b25cf | 2284 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de | 2285 | print_regdomain_info(cfg80211_regdomain); |
734366de | 2286 | #else |
a3d2eaf0 | 2287 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2288 | |
bcf4f99b | 2289 | #endif |
ae9e4b0d LR |
2290 | /* We always try to get an update for the static regdomain */ |
2291 | err = regulatory_hint_core(cfg80211_regdomain->alpha2); | |
ba25c141 | 2292 | if (err) { |
bcf4f99b LR |
2293 | if (err == -ENOMEM) |
2294 | return err; | |
2295 | /* | |
2296 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2297 | * memory which is handled and propagated appropriately above | |
2298 | * but it can also fail during a netlink_broadcast() or during | |
2299 | * early boot for call_usermodehelper(). For now treat these | |
2300 | * errors as non-fatal. | |
2301 | */ | |
2302 | printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " | |
2303 | "to call CRDA during init"); | |
2304 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
2305 | /* We want to find out exactly why when debugging */ | |
2306 | WARN_ON(err); | |
734366de | 2307 | #endif |
bcf4f99b | 2308 | } |
734366de | 2309 | |
ae9e4b0d LR |
2310 | /* |
2311 | * Finally, if the user set the module parameter treat it | |
2312 | * as a user hint. | |
2313 | */ | |
2314 | if (!is_world_regdom(ieee80211_regdom)) | |
2315 | regulatory_hint_user(ieee80211_regdom); | |
2316 | ||
b2e1b302 LR |
2317 | return 0; |
2318 | } | |
2319 | ||
2320 | void regulatory_exit(void) | |
2321 | { | |
fe33eb39 | 2322 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2323 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2324 | |
2325 | cancel_work_sync(®_work); | |
2326 | ||
a1794390 | 2327 | mutex_lock(&cfg80211_mutex); |
734366de | 2328 | |
b2e1b302 | 2329 | reset_regdomains(); |
734366de | 2330 | |
3f2355cb LR |
2331 | kfree(country_ie_regdomain); |
2332 | country_ie_regdomain = NULL; | |
2333 | ||
f6037d09 JB |
2334 | kfree(last_request); |
2335 | ||
b2e1b302 | 2336 | platform_device_unregister(reg_pdev); |
734366de | 2337 | |
e38f8a7a LR |
2338 | spin_lock_bh(®_pending_beacons_lock); |
2339 | if (!list_empty(®_pending_beacons)) { | |
2340 | list_for_each_entry_safe(reg_beacon, btmp, | |
2341 | ®_pending_beacons, list) { | |
2342 | list_del(®_beacon->list); | |
2343 | kfree(reg_beacon); | |
2344 | } | |
2345 | } | |
2346 | spin_unlock_bh(®_pending_beacons_lock); | |
2347 | ||
2348 | if (!list_empty(®_beacon_list)) { | |
2349 | list_for_each_entry_safe(reg_beacon, btmp, | |
2350 | ®_beacon_list, list) { | |
2351 | list_del(®_beacon->list); | |
2352 | kfree(reg_beacon); | |
2353 | } | |
2354 | } | |
2355 | ||
fe33eb39 LR |
2356 | spin_lock(®_requests_lock); |
2357 | if (!list_empty(®_requests_list)) { | |
2358 | list_for_each_entry_safe(reg_request, tmp, | |
2359 | ®_requests_list, list) { | |
2360 | list_del(®_request->list); | |
2361 | kfree(reg_request); | |
2362 | } | |
2363 | } | |
2364 | spin_unlock(®_requests_lock); | |
2365 | ||
a1794390 | 2366 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2367 | } |