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8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
b2e1b302 | 5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
8318d78a JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
b2e1b302 LR |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
14 | * |
15 | * The usual implementation is for a driver to read a device EEPROM to | |
16 | * determine which regulatory domain it should be operating under, then | |
17 | * looking up the allowable channels in a driver-local table and finally | |
18 | * registering those channels in the wiphy structure. | |
19 | * | |
b2e1b302 LR |
20 | * Another set of compliance enforcement is for drivers to use their |
21 | * own compliance limits which can be stored on the EEPROM. The host | |
22 | * driver or firmware may ensure these are used. | |
23 | * | |
24 | * In addition to all this we provide an extra layer of regulatory | |
25 | * conformance. For drivers which do not have any regulatory | |
26 | * information CRDA provides the complete regulatory solution. | |
27 | * For others it provides a community effort on further restrictions | |
28 | * to enhance compliance. | |
29 | * | |
30 | * Note: When number of rules --> infinity we will not be able to | |
31 | * index on alpha2 any more, instead we'll probably have to | |
32 | * rely on some SHA1 checksum of the regdomain for example. | |
33 | * | |
8318d78a JB |
34 | */ |
35 | #include <linux/kernel.h> | |
b2e1b302 LR |
36 | #include <linux/list.h> |
37 | #include <linux/random.h> | |
38 | #include <linux/nl80211.h> | |
39 | #include <linux/platform_device.h> | |
8318d78a | 40 | #include <net/wireless.h> |
b2e1b302 | 41 | #include <net/cfg80211.h> |
8318d78a | 42 | #include "core.h" |
b2e1b302 | 43 | #include "reg.h" |
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 | ||
fe33eb39 LR |
71 | static LIST_HEAD(reg_requests_list); |
72 | static spinlock_t reg_requests_lock; | |
73 | ||
734366de JB |
74 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
75 | static const struct ieee80211_regdomain world_regdom = { | |
3fc71f77 | 76 | .n_reg_rules = 3, |
734366de JB |
77 | .alpha2 = "00", |
78 | .reg_rules = { | |
68798a62 LR |
79 | /* IEEE 802.11b/g, channels 1..11 */ |
80 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
3fc71f77 LR |
81 | /* IEEE 802.11a, channel 36..48 */ |
82 | REG_RULE(5180-10, 5240+10, 40, 6, 23, | |
83 | NL80211_RRF_PASSIVE_SCAN | | |
84 | NL80211_RRF_NO_IBSS), | |
85 | ||
86 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
87 | ||
88 | /* IEEE 802.11a, channel 149..165 */ | |
89 | REG_RULE(5745-10, 5825+10, 40, 6, 23, | |
90 | NL80211_RRF_PASSIVE_SCAN | | |
91 | NL80211_RRF_NO_IBSS), | |
734366de JB |
92 | } |
93 | }; | |
94 | ||
a3d2eaf0 JB |
95 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
96 | &world_regdom; | |
734366de JB |
97 | |
98 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
99 | static char *ieee80211_regdom = "US"; | |
100 | module_param(ieee80211_regdom, charp, 0444); | |
101 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
102 | ||
fb1fc7ad LR |
103 | /* |
104 | * We assume 40 MHz bandwidth for the old regulatory work. | |
734366de | 105 | * We make emphasis we are using the exact same frequencies |
fb1fc7ad LR |
106 | * as before |
107 | */ | |
734366de JB |
108 | |
109 | static const struct ieee80211_regdomain us_regdom = { | |
110 | .n_reg_rules = 6, | |
111 | .alpha2 = "US", | |
112 | .reg_rules = { | |
113 | /* IEEE 802.11b/g, channels 1..11 */ | |
114 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
115 | /* IEEE 802.11a, channel 36 */ | |
116 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
117 | /* IEEE 802.11a, channel 40 */ | |
118 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
119 | /* IEEE 802.11a, channel 44 */ | |
120 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
121 | /* IEEE 802.11a, channels 48..64 */ | |
122 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
123 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
124 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
125 | } | |
126 | }; | |
127 | ||
128 | static const struct ieee80211_regdomain jp_regdom = { | |
129 | .n_reg_rules = 3, | |
130 | .alpha2 = "JP", | |
131 | .reg_rules = { | |
132 | /* IEEE 802.11b/g, channels 1..14 */ | |
133 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
134 | /* IEEE 802.11a, channels 34..48 */ | |
135 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
136 | NL80211_RRF_PASSIVE_SCAN), | |
137 | /* IEEE 802.11a, channels 52..64 */ | |
138 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
139 | NL80211_RRF_NO_IBSS | | |
140 | NL80211_RRF_DFS), | |
141 | } | |
142 | }; | |
143 | ||
144 | static const struct ieee80211_regdomain eu_regdom = { | |
145 | .n_reg_rules = 6, | |
fb1fc7ad LR |
146 | /* |
147 | * This alpha2 is bogus, we leave it here just for stupid | |
148 | * backward compatibility | |
149 | */ | |
734366de JB |
150 | .alpha2 = "EU", |
151 | .reg_rules = { | |
152 | /* IEEE 802.11b/g, channels 1..13 */ | |
153 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
154 | /* IEEE 802.11a, channel 36 */ | |
155 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
156 | NL80211_RRF_PASSIVE_SCAN), | |
157 | /* IEEE 802.11a, channel 40 */ | |
158 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
159 | NL80211_RRF_PASSIVE_SCAN), | |
160 | /* IEEE 802.11a, channel 44 */ | |
161 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
162 | NL80211_RRF_PASSIVE_SCAN), | |
163 | /* IEEE 802.11a, channels 48..64 */ | |
164 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
165 | NL80211_RRF_NO_IBSS | | |
166 | NL80211_RRF_DFS), | |
167 | /* IEEE 802.11a, channels 100..140 */ | |
168 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
169 | NL80211_RRF_NO_IBSS | | |
170 | NL80211_RRF_DFS), | |
171 | } | |
172 | }; | |
173 | ||
174 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
175 | { | |
176 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
177 | return &us_regdom; | |
178 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
179 | return &jp_regdom; | |
180 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
181 | return &eu_regdom; | |
182 | /* Default, as per the old rules */ | |
183 | return &us_regdom; | |
184 | } | |
185 | ||
a3d2eaf0 | 186 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
187 | { |
188 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
189 | return true; | |
190 | return false; | |
191 | } | |
942b25cf JB |
192 | #else |
193 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 194 | { |
942b25cf | 195 | return false; |
734366de | 196 | } |
942b25cf JB |
197 | #endif |
198 | ||
734366de JB |
199 | static void reset_regdomains(void) |
200 | { | |
942b25cf JB |
201 | /* avoid freeing static information or freeing something twice */ |
202 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
203 | cfg80211_regdomain = NULL; | |
204 | if (cfg80211_world_regdom == &world_regdom) | |
205 | cfg80211_world_regdom = NULL; | |
206 | if (cfg80211_regdomain == &world_regdom) | |
207 | cfg80211_regdomain = NULL; | |
208 | if (is_old_static_regdom(cfg80211_regdomain)) | |
209 | cfg80211_regdomain = NULL; | |
210 | ||
211 | kfree(cfg80211_regdomain); | |
212 | kfree(cfg80211_world_regdom); | |
734366de | 213 | |
a3d2eaf0 | 214 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
215 | cfg80211_regdomain = NULL; |
216 | } | |
217 | ||
fb1fc7ad LR |
218 | /* |
219 | * Dynamic world regulatory domain requested by the wireless | |
220 | * core upon initialization | |
221 | */ | |
a3d2eaf0 | 222 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 223 | { |
f6037d09 | 224 | BUG_ON(!last_request); |
734366de JB |
225 | |
226 | reset_regdomains(); | |
227 | ||
228 | cfg80211_world_regdom = rd; | |
229 | cfg80211_regdomain = rd; | |
230 | } | |
734366de | 231 | |
a3d2eaf0 | 232 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
233 | { |
234 | if (!alpha2) | |
235 | return false; | |
236 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
237 | return true; | |
238 | return false; | |
239 | } | |
8318d78a | 240 | |
a3d2eaf0 | 241 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
242 | { |
243 | if (!alpha2) | |
244 | return false; | |
245 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
246 | return true; | |
247 | return false; | |
248 | } | |
8318d78a | 249 | |
b2e1b302 LR |
250 | static bool is_alpha_upper(char letter) |
251 | { | |
252 | /* ASCII A - Z */ | |
253 | if (letter >= 65 && letter <= 90) | |
254 | return true; | |
255 | return false; | |
256 | } | |
8318d78a | 257 | |
a3d2eaf0 | 258 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
259 | { |
260 | if (!alpha2) | |
261 | return false; | |
fb1fc7ad LR |
262 | /* |
263 | * Special case where regulatory domain was built by driver | |
264 | * but a specific alpha2 cannot be determined | |
265 | */ | |
b2e1b302 LR |
266 | if (alpha2[0] == '9' && alpha2[1] == '9') |
267 | return true; | |
268 | return false; | |
269 | } | |
8318d78a | 270 | |
3f2355cb LR |
271 | static bool is_intersected_alpha2(const char *alpha2) |
272 | { | |
273 | if (!alpha2) | |
274 | return false; | |
fb1fc7ad LR |
275 | /* |
276 | * Special case where regulatory domain is the | |
3f2355cb | 277 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
278 | * structures |
279 | */ | |
3f2355cb LR |
280 | if (alpha2[0] == '9' && alpha2[1] == '8') |
281 | return true; | |
282 | return false; | |
283 | } | |
284 | ||
a3d2eaf0 | 285 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
286 | { |
287 | if (!alpha2) | |
288 | return false; | |
289 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
290 | return true; | |
291 | return false; | |
292 | } | |
8318d78a | 293 | |
a3d2eaf0 | 294 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
295 | { |
296 | if (!alpha2_x || !alpha2_y) | |
297 | return false; | |
298 | if (alpha2_x[0] == alpha2_y[0] && | |
299 | alpha2_x[1] == alpha2_y[1]) | |
300 | return true; | |
301 | return false; | |
302 | } | |
303 | ||
69b1572b | 304 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 305 | { |
761cf7ec LR |
306 | assert_cfg80211_lock(); |
307 | ||
b2e1b302 LR |
308 | if (!cfg80211_regdomain) |
309 | return true; | |
310 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
311 | return false; | |
312 | return true; | |
313 | } | |
314 | ||
3f2355cb LR |
315 | /** |
316 | * country_ie_integrity_changes - tells us if the country IE has changed | |
317 | * @checksum: checksum of country IE of fields we are interested in | |
318 | * | |
319 | * If the country IE has not changed you can ignore it safely. This is | |
320 | * useful to determine if two devices are seeing two different country IEs | |
321 | * even on the same alpha2. Note that this will return false if no IE has | |
322 | * been set on the wireless core yet. | |
323 | */ | |
324 | static bool country_ie_integrity_changes(u32 checksum) | |
325 | { | |
326 | /* If no IE has been set then the checksum doesn't change */ | |
327 | if (unlikely(!last_request->country_ie_checksum)) | |
328 | return false; | |
329 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
330 | return true; | |
331 | return false; | |
332 | } | |
333 | ||
fb1fc7ad LR |
334 | /* |
335 | * This lets us keep regulatory code which is updated on a regulatory | |
336 | * basis in userspace. | |
337 | */ | |
b2e1b302 LR |
338 | static int call_crda(const char *alpha2) |
339 | { | |
340 | char country_env[9 + 2] = "COUNTRY="; | |
341 | char *envp[] = { | |
342 | country_env, | |
343 | NULL | |
344 | }; | |
345 | ||
346 | if (!is_world_regdom((char *) alpha2)) | |
347 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
348 | alpha2[0], alpha2[1]); | |
349 | else | |
b2e1b302 LR |
350 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
351 | "regulatory domain\n"); | |
b2e1b302 LR |
352 | |
353 | country_env[8] = alpha2[0]; | |
354 | country_env[9] = alpha2[1]; | |
355 | ||
356 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
357 | } | |
358 | ||
b2e1b302 | 359 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 360 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 361 | { |
f6037d09 JB |
362 | if (!last_request) |
363 | return false; | |
364 | ||
365 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 366 | } |
8318d78a | 367 | |
b2e1b302 | 368 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 369 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 370 | { |
a3d2eaf0 | 371 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
372 | u32 freq_diff; |
373 | ||
91e99004 | 374 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
375 | return false; |
376 | ||
377 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
378 | return false; | |
379 | ||
380 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
381 | ||
d71aaf60 | 382 | if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff) |
b2e1b302 LR |
383 | return false; |
384 | ||
385 | return true; | |
386 | } | |
387 | ||
a3d2eaf0 | 388 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 389 | { |
a3d2eaf0 | 390 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 391 | unsigned int i; |
8318d78a | 392 | |
b2e1b302 LR |
393 | if (!rd->n_reg_rules) |
394 | return false; | |
8318d78a | 395 | |
88dc1c3f LR |
396 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
397 | return false; | |
398 | ||
b2e1b302 LR |
399 | for (i = 0; i < rd->n_reg_rules; i++) { |
400 | reg_rule = &rd->reg_rules[i]; | |
401 | if (!is_valid_reg_rule(reg_rule)) | |
402 | return false; | |
403 | } | |
404 | ||
405 | return true; | |
8318d78a JB |
406 | } |
407 | ||
b2e1b302 LR |
408 | /* Returns value in KHz */ |
409 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
410 | u32 freq) | |
411 | { | |
412 | unsigned int i; | |
413 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
414 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
415 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
416 | if (start_freq_khz >= freq_range->start_freq_khz && | |
417 | end_freq_khz <= freq_range->end_freq_khz) | |
418 | return supported_bandwidths[i]; | |
419 | } | |
420 | return 0; | |
421 | } | |
8318d78a | 422 | |
0c7dc45d LR |
423 | /** |
424 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
425 | * @freq_range: frequency rule we want to query | |
426 | * @freq_khz: frequency we are inquiring about | |
427 | * | |
428 | * This lets us know if a specific frequency rule is or is not relevant to | |
429 | * a specific frequency's band. Bands are device specific and artificial | |
430 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
431 | * safe for now to assume that a frequency rule should not be part of a | |
432 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
433 | * This resolution can be lowered and should be considered as we add | |
434 | * regulatory rule support for other "bands". | |
435 | **/ | |
436 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
437 | u32 freq_khz) | |
438 | { | |
439 | #define ONE_GHZ_IN_KHZ 1000000 | |
440 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
441 | return true; | |
442 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
443 | return true; | |
444 | return false; | |
445 | #undef ONE_GHZ_IN_KHZ | |
446 | } | |
447 | ||
fb1fc7ad LR |
448 | /* |
449 | * Converts a country IE to a regulatory domain. A regulatory domain | |
3f2355cb LR |
450 | * structure has a lot of information which the IE doesn't yet have, |
451 | * so for the other values we use upper max values as we will intersect | |
fb1fc7ad LR |
452 | * with our userspace regulatory agent to get lower bounds. |
453 | */ | |
3f2355cb LR |
454 | static struct ieee80211_regdomain *country_ie_2_rd( |
455 | u8 *country_ie, | |
456 | u8 country_ie_len, | |
457 | u32 *checksum) | |
458 | { | |
459 | struct ieee80211_regdomain *rd = NULL; | |
460 | unsigned int i = 0; | |
461 | char alpha2[2]; | |
462 | u32 flags = 0; | |
463 | u32 num_rules = 0, size_of_regd = 0; | |
464 | u8 *triplets_start = NULL; | |
465 | u8 len_at_triplet = 0; | |
466 | /* the last channel we have registered in a subband (triplet) */ | |
467 | int last_sub_max_channel = 0; | |
468 | ||
469 | *checksum = 0xDEADBEEF; | |
470 | ||
471 | /* Country IE requirements */ | |
472 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
473 | country_ie_len & 0x01); | |
474 | ||
475 | alpha2[0] = country_ie[0]; | |
476 | alpha2[1] = country_ie[1]; | |
477 | ||
478 | /* | |
479 | * Third octet can be: | |
480 | * 'I' - Indoor | |
481 | * 'O' - Outdoor | |
482 | * | |
483 | * anything else we assume is no restrictions | |
484 | */ | |
485 | if (country_ie[2] == 'I') | |
486 | flags = NL80211_RRF_NO_OUTDOOR; | |
487 | else if (country_ie[2] == 'O') | |
488 | flags = NL80211_RRF_NO_INDOOR; | |
489 | ||
490 | country_ie += 3; | |
491 | country_ie_len -= 3; | |
492 | ||
493 | triplets_start = country_ie; | |
494 | len_at_triplet = country_ie_len; | |
495 | ||
496 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
497 | ||
fb1fc7ad LR |
498 | /* |
499 | * We need to build a reg rule for each triplet, but first we must | |
3f2355cb | 500 | * calculate the number of reg rules we will need. We will need one |
fb1fc7ad LR |
501 | * for each channel subband |
502 | */ | |
3f2355cb | 503 | while (country_ie_len >= 3) { |
615aab4b | 504 | int end_channel = 0; |
3f2355cb LR |
505 | struct ieee80211_country_ie_triplet *triplet = |
506 | (struct ieee80211_country_ie_triplet *) country_ie; | |
507 | int cur_sub_max_channel = 0, cur_channel = 0; | |
508 | ||
509 | if (triplet->ext.reg_extension_id >= | |
510 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
511 | country_ie += 3; | |
512 | country_ie_len -= 3; | |
513 | continue; | |
514 | } | |
515 | ||
615aab4b LR |
516 | /* 2 GHz */ |
517 | if (triplet->chans.first_channel <= 14) | |
518 | end_channel = triplet->chans.first_channel + | |
519 | triplet->chans.num_channels; | |
520 | else | |
521 | /* | |
522 | * 5 GHz -- For example in country IEs if the first | |
523 | * channel given is 36 and the number of channels is 4 | |
524 | * then the individual channel numbers defined for the | |
525 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
526 | * and not 36, 37, 38, 39. | |
527 | * | |
528 | * See: http://tinyurl.com/11d-clarification | |
529 | */ | |
530 | end_channel = triplet->chans.first_channel + | |
531 | (4 * (triplet->chans.num_channels - 1)); | |
532 | ||
3f2355cb | 533 | cur_channel = triplet->chans.first_channel; |
615aab4b | 534 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
535 | |
536 | /* Basic sanity check */ | |
537 | if (cur_sub_max_channel < cur_channel) | |
538 | return NULL; | |
539 | ||
fb1fc7ad LR |
540 | /* |
541 | * Do not allow overlapping channels. Also channels | |
3f2355cb | 542 | * passed in each subband must be monotonically |
fb1fc7ad LR |
543 | * increasing |
544 | */ | |
3f2355cb LR |
545 | if (last_sub_max_channel) { |
546 | if (cur_channel <= last_sub_max_channel) | |
547 | return NULL; | |
548 | if (cur_sub_max_channel <= last_sub_max_channel) | |
549 | return NULL; | |
550 | } | |
551 | ||
fb1fc7ad LR |
552 | /* |
553 | * When dot11RegulatoryClassesRequired is supported | |
3f2355cb LR |
554 | * we can throw ext triplets as part of this soup, |
555 | * for now we don't care when those change as we | |
fb1fc7ad LR |
556 | * don't support them |
557 | */ | |
3f2355cb LR |
558 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | |
559 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
560 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
561 | ||
562 | last_sub_max_channel = cur_sub_max_channel; | |
563 | ||
564 | country_ie += 3; | |
565 | country_ie_len -= 3; | |
566 | num_rules++; | |
567 | ||
fb1fc7ad LR |
568 | /* |
569 | * Note: this is not a IEEE requirement but | |
570 | * simply a memory requirement | |
571 | */ | |
3f2355cb LR |
572 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) |
573 | return NULL; | |
574 | } | |
575 | ||
576 | country_ie = triplets_start; | |
577 | country_ie_len = len_at_triplet; | |
578 | ||
579 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
580 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
581 | ||
582 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
583 | if (!rd) | |
584 | return NULL; | |
585 | ||
586 | rd->n_reg_rules = num_rules; | |
587 | rd->alpha2[0] = alpha2[0]; | |
588 | rd->alpha2[1] = alpha2[1]; | |
589 | ||
590 | /* This time around we fill in the rd */ | |
591 | while (country_ie_len >= 3) { | |
02e68a3d | 592 | int end_channel = 0; |
3f2355cb LR |
593 | struct ieee80211_country_ie_triplet *triplet = |
594 | (struct ieee80211_country_ie_triplet *) country_ie; | |
595 | struct ieee80211_reg_rule *reg_rule = NULL; | |
596 | struct ieee80211_freq_range *freq_range = NULL; | |
597 | struct ieee80211_power_rule *power_rule = NULL; | |
598 | ||
fb1fc7ad LR |
599 | /* |
600 | * Must parse if dot11RegulatoryClassesRequired is true, | |
601 | * we don't support this yet | |
602 | */ | |
3f2355cb LR |
603 | if (triplet->ext.reg_extension_id >= |
604 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
605 | country_ie += 3; | |
606 | country_ie_len -= 3; | |
607 | continue; | |
608 | } | |
609 | ||
610 | reg_rule = &rd->reg_rules[i]; | |
611 | freq_range = ®_rule->freq_range; | |
612 | power_rule = ®_rule->power_rule; | |
613 | ||
614 | reg_rule->flags = flags; | |
615 | ||
02e68a3d LR |
616 | /* 2 GHz */ |
617 | if (triplet->chans.first_channel <= 14) | |
618 | end_channel = triplet->chans.first_channel + | |
619 | triplet->chans.num_channels; | |
620 | else | |
02e68a3d LR |
621 | end_channel = triplet->chans.first_channel + |
622 | (4 * (triplet->chans.num_channels - 1)); | |
623 | ||
fb1fc7ad LR |
624 | /* |
625 | * The +10 is since the regulatory domain expects | |
3f2355cb LR |
626 | * the actual band edge, not the center of freq for |
627 | * its start and end freqs, assuming 20 MHz bandwidth on | |
fb1fc7ad LR |
628 | * the channels passed |
629 | */ | |
3f2355cb LR |
630 | freq_range->start_freq_khz = |
631 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
632 | triplet->chans.first_channel) - 10); | |
633 | freq_range->end_freq_khz = | |
634 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 635 | end_channel) + 10); |
3f2355cb | 636 | |
fb1fc7ad LR |
637 | /* |
638 | * These are large arbitrary values we use to intersect later. | |
639 | * Increment this if we ever support >= 40 MHz channels | |
640 | * in IEEE 802.11 | |
641 | */ | |
3f2355cb LR |
642 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); |
643 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
644 | power_rule->max_eirp = DBM_TO_MBM(100); | |
645 | ||
646 | country_ie += 3; | |
647 | country_ie_len -= 3; | |
648 | i++; | |
649 | ||
650 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
651 | } | |
652 | ||
653 | return rd; | |
654 | } | |
655 | ||
656 | ||
fb1fc7ad LR |
657 | /* |
658 | * Helper for regdom_intersect(), this does the real | |
659 | * mathematical intersection fun | |
660 | */ | |
9c96477d LR |
661 | static int reg_rules_intersect( |
662 | const struct ieee80211_reg_rule *rule1, | |
663 | const struct ieee80211_reg_rule *rule2, | |
664 | struct ieee80211_reg_rule *intersected_rule) | |
665 | { | |
666 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
667 | struct ieee80211_freq_range *freq_range; | |
668 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
669 | struct ieee80211_power_rule *power_rule; | |
670 | u32 freq_diff; | |
671 | ||
672 | freq_range1 = &rule1->freq_range; | |
673 | freq_range2 = &rule2->freq_range; | |
674 | freq_range = &intersected_rule->freq_range; | |
675 | ||
676 | power_rule1 = &rule1->power_rule; | |
677 | power_rule2 = &rule2->power_rule; | |
678 | power_rule = &intersected_rule->power_rule; | |
679 | ||
680 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
681 | freq_range2->start_freq_khz); | |
682 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
683 | freq_range2->end_freq_khz); | |
684 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
685 | freq_range2->max_bandwidth_khz); | |
686 | ||
687 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
688 | if (freq_range->max_bandwidth_khz > freq_diff) | |
689 | freq_range->max_bandwidth_khz = freq_diff; | |
690 | ||
691 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
692 | power_rule2->max_eirp); | |
693 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
694 | power_rule2->max_antenna_gain); | |
695 | ||
696 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
697 | ||
698 | if (!is_valid_reg_rule(intersected_rule)) | |
699 | return -EINVAL; | |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
704 | /** | |
705 | * regdom_intersect - do the intersection between two regulatory domains | |
706 | * @rd1: first regulatory domain | |
707 | * @rd2: second regulatory domain | |
708 | * | |
709 | * Use this function to get the intersection between two regulatory domains. | |
710 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
711 | * as no one single alpha2 can represent this regulatory domain. | |
712 | * | |
713 | * Returns a pointer to the regulatory domain structure which will hold the | |
714 | * resulting intersection of rules between rd1 and rd2. We will | |
715 | * kzalloc() this structure for you. | |
716 | */ | |
717 | static struct ieee80211_regdomain *regdom_intersect( | |
718 | const struct ieee80211_regdomain *rd1, | |
719 | const struct ieee80211_regdomain *rd2) | |
720 | { | |
721 | int r, size_of_regd; | |
722 | unsigned int x, y; | |
723 | unsigned int num_rules = 0, rule_idx = 0; | |
724 | const struct ieee80211_reg_rule *rule1, *rule2; | |
725 | struct ieee80211_reg_rule *intersected_rule; | |
726 | struct ieee80211_regdomain *rd; | |
727 | /* This is just a dummy holder to help us count */ | |
728 | struct ieee80211_reg_rule irule; | |
729 | ||
730 | /* Uses the stack temporarily for counter arithmetic */ | |
731 | intersected_rule = &irule; | |
732 | ||
733 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
734 | ||
735 | if (!rd1 || !rd2) | |
736 | return NULL; | |
737 | ||
fb1fc7ad LR |
738 | /* |
739 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
740 | * build them. This is to so we can malloc() and free() a |
741 | * regdomain once. The reason we use reg_rules_intersect() here | |
742 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
743 | * All rules that do check out OK are valid. |
744 | */ | |
9c96477d LR |
745 | |
746 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
747 | rule1 = &rd1->reg_rules[x]; | |
748 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
749 | rule2 = &rd2->reg_rules[y]; | |
750 | if (!reg_rules_intersect(rule1, rule2, | |
751 | intersected_rule)) | |
752 | num_rules++; | |
753 | memset(intersected_rule, 0, | |
754 | sizeof(struct ieee80211_reg_rule)); | |
755 | } | |
756 | } | |
757 | ||
758 | if (!num_rules) | |
759 | return NULL; | |
760 | ||
761 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
762 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
763 | ||
764 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
765 | if (!rd) | |
766 | return NULL; | |
767 | ||
768 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
769 | rule1 = &rd1->reg_rules[x]; | |
770 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
771 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
772 | /* |
773 | * This time around instead of using the stack lets | |
9c96477d | 774 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
775 | * a memcpy() |
776 | */ | |
9c96477d LR |
777 | intersected_rule = &rd->reg_rules[rule_idx]; |
778 | r = reg_rules_intersect(rule1, rule2, | |
779 | intersected_rule); | |
fb1fc7ad LR |
780 | /* |
781 | * No need to memset here the intersected rule here as | |
782 | * we're not using the stack anymore | |
783 | */ | |
9c96477d LR |
784 | if (r) |
785 | continue; | |
786 | rule_idx++; | |
787 | } | |
788 | } | |
789 | ||
790 | if (rule_idx != num_rules) { | |
791 | kfree(rd); | |
792 | return NULL; | |
793 | } | |
794 | ||
795 | rd->n_reg_rules = num_rules; | |
796 | rd->alpha2[0] = '9'; | |
797 | rd->alpha2[1] = '8'; | |
798 | ||
799 | return rd; | |
800 | } | |
801 | ||
fb1fc7ad LR |
802 | /* |
803 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
804 | * want to just have the channel structure use these | |
805 | */ | |
b2e1b302 LR |
806 | static u32 map_regdom_flags(u32 rd_flags) |
807 | { | |
808 | u32 channel_flags = 0; | |
809 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
810 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
811 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
812 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
813 | if (rd_flags & NL80211_RRF_DFS) | |
814 | channel_flags |= IEEE80211_CHAN_RADAR; | |
815 | return channel_flags; | |
816 | } | |
817 | ||
1fa25e41 LR |
818 | static int freq_reg_info_regd(struct wiphy *wiphy, |
819 | u32 center_freq, | |
820 | u32 *bandwidth, | |
821 | const struct ieee80211_reg_rule **reg_rule, | |
822 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
823 | { |
824 | int i; | |
0c7dc45d | 825 | bool band_rule_found = false; |
3e0c3ff3 | 826 | const struct ieee80211_regdomain *regd; |
b2e1b302 | 827 | u32 max_bandwidth = 0; |
8318d78a | 828 | |
1fa25e41 | 829 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 830 | |
fb1fc7ad LR |
831 | /* |
832 | * Follow the driver's regulatory domain, if present, unless a country | |
833 | * IE has been processed or a user wants to help complaince further | |
834 | */ | |
3e0c3ff3 | 835 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE && |
24ed1da1 | 836 | last_request->initiator != REGDOM_SET_BY_USER && |
3e0c3ff3 LR |
837 | wiphy->regd) |
838 | regd = wiphy->regd; | |
839 | ||
840 | if (!regd) | |
b2e1b302 LR |
841 | return -EINVAL; |
842 | ||
3e0c3ff3 | 843 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
844 | const struct ieee80211_reg_rule *rr; |
845 | const struct ieee80211_freq_range *fr = NULL; | |
846 | const struct ieee80211_power_rule *pr = NULL; | |
847 | ||
3e0c3ff3 | 848 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
849 | fr = &rr->freq_range; |
850 | pr = &rr->power_rule; | |
0c7dc45d | 851 | |
fb1fc7ad LR |
852 | /* |
853 | * We only need to know if one frequency rule was | |
0c7dc45d | 854 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
855 | * not overwrite it once found |
856 | */ | |
0c7dc45d LR |
857 | if (!band_rule_found) |
858 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
859 | ||
b2e1b302 | 860 | max_bandwidth = freq_max_bandwidth(fr, center_freq); |
0c7dc45d | 861 | |
b2e1b302 LR |
862 | if (max_bandwidth && *bandwidth <= max_bandwidth) { |
863 | *reg_rule = rr; | |
864 | *bandwidth = max_bandwidth; | |
8318d78a JB |
865 | break; |
866 | } | |
867 | } | |
868 | ||
0c7dc45d LR |
869 | if (!band_rule_found) |
870 | return -ERANGE; | |
871 | ||
b2e1b302 LR |
872 | return !max_bandwidth; |
873 | } | |
34f57347 | 874 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 875 | |
34f57347 | 876 | int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth, |
1fa25e41 LR |
877 | const struct ieee80211_reg_rule **reg_rule) |
878 | { | |
879 | return freq_reg_info_regd(wiphy, center_freq, | |
880 | bandwidth, reg_rule, NULL); | |
881 | } | |
b2e1b302 | 882 | |
a92a3ce7 LR |
883 | static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, |
884 | unsigned int chan_idx) | |
b2e1b302 LR |
885 | { |
886 | int r; | |
a92a3ce7 | 887 | u32 flags; |
b2e1b302 LR |
888 | u32 max_bandwidth = 0; |
889 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
890 | const struct ieee80211_power_rule *power_rule = NULL; | |
a92a3ce7 LR |
891 | struct ieee80211_supported_band *sband; |
892 | struct ieee80211_channel *chan; | |
fe33eb39 | 893 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 894 | |
761cf7ec LR |
895 | assert_cfg80211_lock(); |
896 | ||
806a9e39 LR |
897 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
898 | ||
a92a3ce7 LR |
899 | sband = wiphy->bands[band]; |
900 | BUG_ON(chan_idx >= sband->n_channels); | |
901 | chan = &sband->channels[chan_idx]; | |
902 | ||
903 | flags = chan->orig_flags; | |
b2e1b302 | 904 | |
3e0c3ff3 | 905 | r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq), |
b2e1b302 LR |
906 | &max_bandwidth, ®_rule); |
907 | ||
908 | if (r) { | |
fb1fc7ad LR |
909 | /* |
910 | * This means no regulatory rule was found in the country IE | |
0c7dc45d LR |
911 | * with a frequency range on the center_freq's band, since |
912 | * IEEE-802.11 allows for a country IE to have a subset of the | |
913 | * regulatory information provided in a country we ignore | |
914 | * disabling the channel unless at least one reg rule was | |
915 | * found on the center_freq's band. For details see this | |
916 | * clarification: | |
917 | * | |
918 | * http://tinyurl.com/11d-clarification | |
919 | */ | |
920 | if (r == -ERANGE && | |
921 | last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
922 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
923 | printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " | |
924 | "intact on %s - no rule found in band on " | |
925 | "Country IE\n", | |
926 | chan->center_freq, wiphy_name(wiphy)); | |
927 | #endif | |
928 | } else { | |
fb1fc7ad LR |
929 | /* |
930 | * In this case we know the country IE has at least one reg rule | |
931 | * for the band so we respect its band definitions | |
932 | */ | |
0c7dc45d LR |
933 | #ifdef CONFIG_CFG80211_REG_DEBUG |
934 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
935 | printk(KERN_DEBUG "cfg80211: Disabling " | |
936 | "channel %d MHz on %s due to " | |
937 | "Country IE\n", | |
938 | chan->center_freq, wiphy_name(wiphy)); | |
939 | #endif | |
940 | flags |= IEEE80211_CHAN_DISABLED; | |
941 | chan->flags = flags; | |
942 | } | |
8318d78a JB |
943 | return; |
944 | } | |
945 | ||
b2e1b302 LR |
946 | power_rule = ®_rule->power_rule; |
947 | ||
f976376d | 948 | if (last_request->initiator == REGDOM_SET_BY_DRIVER && |
806a9e39 LR |
949 | request_wiphy && request_wiphy == wiphy && |
950 | request_wiphy->strict_regulatory) { | |
fb1fc7ad LR |
951 | /* |
952 | * This gaurantees the driver's requested regulatory domain | |
f976376d | 953 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
954 | * settings |
955 | */ | |
f976376d LR |
956 | chan->flags = chan->orig_flags = |
957 | map_regdom_flags(reg_rule->flags); | |
958 | chan->max_antenna_gain = chan->orig_mag = | |
959 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
960 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
961 | chan->max_power = chan->orig_mpwr = | |
962 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
963 | return; | |
964 | } | |
965 | ||
b2e1b302 | 966 | chan->flags = flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 967 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
968 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
969 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 970 | if (chan->orig_mpwr) |
b2e1b302 LR |
971 | chan->max_power = min(chan->orig_mpwr, |
972 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 973 | else |
b2e1b302 | 974 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
975 | } |
976 | ||
a92a3ce7 | 977 | static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) |
8318d78a | 978 | { |
a92a3ce7 LR |
979 | unsigned int i; |
980 | struct ieee80211_supported_band *sband; | |
981 | ||
982 | BUG_ON(!wiphy->bands[band]); | |
983 | sband = wiphy->bands[band]; | |
8318d78a JB |
984 | |
985 | for (i = 0; i < sband->n_channels; i++) | |
a92a3ce7 | 986 | handle_channel(wiphy, band, i); |
8318d78a JB |
987 | } |
988 | ||
14b9815a LR |
989 | static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby) |
990 | { | |
991 | if (!last_request) | |
992 | return true; | |
993 | if (setby == REGDOM_SET_BY_CORE && | |
2a44f911 | 994 | wiphy->custom_regulatory) |
14b9815a | 995 | return true; |
fb1fc7ad LR |
996 | /* |
997 | * wiphy->regd will be set once the device has its own | |
998 | * desired regulatory domain set | |
999 | */ | |
f976376d LR |
1000 | if (wiphy->strict_regulatory && !wiphy->regd && |
1001 | !is_world_regdom(last_request->alpha2)) | |
14b9815a LR |
1002 | return true; |
1003 | return false; | |
1004 | } | |
1005 | ||
b2e1b302 | 1006 | static void update_all_wiphy_regulatory(enum reg_set_by setby) |
8318d78a | 1007 | { |
b2e1b302 | 1008 | struct cfg80211_registered_device *drv; |
8318d78a | 1009 | |
b2e1b302 | 1010 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
d46e5b1d | 1011 | wiphy_update_regulatory(&drv->wiphy, setby); |
b2e1b302 LR |
1012 | } |
1013 | ||
1014 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
1015 | { | |
1016 | enum ieee80211_band band; | |
d46e5b1d LR |
1017 | |
1018 | if (ignore_reg_update(wiphy, setby)) | |
1019 | return; | |
b2e1b302 | 1020 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1021 | if (wiphy->bands[band]) |
a92a3ce7 | 1022 | handle_band(wiphy, band); |
b2e1b302 | 1023 | } |
560e28e1 | 1024 | if (wiphy->reg_notifier) |
716f9392 | 1025 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1026 | } |
1027 | ||
1fa25e41 LR |
1028 | static void handle_channel_custom(struct wiphy *wiphy, |
1029 | enum ieee80211_band band, | |
1030 | unsigned int chan_idx, | |
1031 | const struct ieee80211_regdomain *regd) | |
1032 | { | |
1033 | int r; | |
1034 | u32 max_bandwidth = 0; | |
1035 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1036 | const struct ieee80211_power_rule *power_rule = NULL; | |
1037 | struct ieee80211_supported_band *sband; | |
1038 | struct ieee80211_channel *chan; | |
1039 | ||
1040 | sband = wiphy->bands[band]; | |
1041 | BUG_ON(chan_idx >= sband->n_channels); | |
1042 | chan = &sband->channels[chan_idx]; | |
1043 | ||
1044 | r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq), | |
1045 | &max_bandwidth, ®_rule, regd); | |
1046 | ||
1047 | if (r) { | |
1048 | chan->flags = IEEE80211_CHAN_DISABLED; | |
1049 | return; | |
1050 | } | |
1051 | ||
1052 | power_rule = ®_rule->power_rule; | |
1053 | ||
1054 | chan->flags |= map_regdom_flags(reg_rule->flags); | |
1055 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
1056 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
1057 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
1058 | } | |
1059 | ||
1060 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1061 | const struct ieee80211_regdomain *regd) | |
1062 | { | |
1063 | unsigned int i; | |
1064 | struct ieee80211_supported_band *sband; | |
1065 | ||
1066 | BUG_ON(!wiphy->bands[band]); | |
1067 | sband = wiphy->bands[band]; | |
1068 | ||
1069 | for (i = 0; i < sband->n_channels; i++) | |
1070 | handle_channel_custom(wiphy, band, i, regd); | |
1071 | } | |
1072 | ||
1073 | /* Used by drivers prior to wiphy registration */ | |
1074 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1075 | const struct ieee80211_regdomain *regd) | |
1076 | { | |
1077 | enum ieee80211_band band; | |
1078 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1079 | if (wiphy->bands[band]) | |
1080 | handle_band_custom(wiphy, band, regd); | |
b2e1b302 LR |
1081 | } |
1082 | } | |
1fa25e41 LR |
1083 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1084 | ||
3e0c3ff3 LR |
1085 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
1086 | const struct ieee80211_regdomain *src_regd) | |
1087 | { | |
1088 | struct ieee80211_regdomain *regd; | |
1089 | int size_of_regd = 0; | |
1090 | unsigned int i; | |
1091 | ||
1092 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1093 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
1094 | ||
1095 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
1096 | if (!regd) | |
1097 | return -ENOMEM; | |
1098 | ||
1099 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
1100 | ||
1101 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
1102 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
1103 | sizeof(struct ieee80211_reg_rule)); | |
1104 | ||
1105 | *dst_regd = regd; | |
1106 | return 0; | |
1107 | } | |
b2e1b302 | 1108 | |
fb1fc7ad LR |
1109 | /* |
1110 | * Return value which can be used by ignore_request() to indicate | |
1111 | * it has been determined we should intersect two regulatory domains | |
1112 | */ | |
9c96477d LR |
1113 | #define REG_INTERSECT 1 |
1114 | ||
84fa4f43 JB |
1115 | /* This has the logic which determines when a new request |
1116 | * should be ignored. */ | |
1117 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
1118 | const char *alpha2) | |
1119 | { | |
806a9e39 | 1120 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1121 | |
1122 | assert_cfg80211_lock(); | |
1123 | ||
84fa4f43 JB |
1124 | /* All initial requests are respected */ |
1125 | if (!last_request) | |
1126 | return 0; | |
1127 | ||
1128 | switch (set_by) { | |
1129 | case REGDOM_SET_BY_INIT: | |
1130 | return -EINVAL; | |
1131 | case REGDOM_SET_BY_CORE: | |
ba25c141 | 1132 | return -EINVAL; |
84fa4f43 | 1133 | case REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1134 | |
1135 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1136 | ||
84fa4f43 JB |
1137 | if (unlikely(!is_an_alpha2(alpha2))) |
1138 | return -EINVAL; | |
1139 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1140 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1141 | /* |
1142 | * Two cards with two APs claiming different | |
1143 | * different Country IE alpha2s. We could | |
1144 | * intersect them, but that seems unlikely | |
1145 | * to be correct. Reject second one for now. | |
1146 | */ | |
69b1572b | 1147 | if (regdom_changes(alpha2)) |
84fa4f43 JB |
1148 | return -EOPNOTSUPP; |
1149 | return -EALREADY; | |
1150 | } | |
fb1fc7ad LR |
1151 | /* |
1152 | * Two consecutive Country IE hints on the same wiphy. | |
1153 | * This should be picked up early by the driver/stack | |
1154 | */ | |
69b1572b | 1155 | if (WARN_ON(regdom_changes(alpha2))) |
84fa4f43 JB |
1156 | return 0; |
1157 | return -EALREADY; | |
1158 | } | |
3f2355cb | 1159 | return REG_INTERSECT; |
84fa4f43 | 1160 | case REGDOM_SET_BY_DRIVER: |
e74b1e7f LR |
1161 | if (last_request->initiator == REGDOM_SET_BY_CORE) { |
1162 | if (is_old_static_regdom(cfg80211_regdomain)) | |
1163 | return 0; | |
69b1572b | 1164 | if (regdom_changes(alpha2)) |
e74b1e7f | 1165 | return 0; |
84fa4f43 | 1166 | return -EALREADY; |
e74b1e7f | 1167 | } |
fff32c04 LR |
1168 | |
1169 | /* | |
1170 | * This would happen if you unplug and plug your card | |
1171 | * back in or if you add a new device for which the previously | |
1172 | * loaded card also agrees on the regulatory domain. | |
1173 | */ | |
1174 | if (last_request->initiator == REGDOM_SET_BY_DRIVER && | |
69b1572b | 1175 | !regdom_changes(alpha2)) |
fff32c04 LR |
1176 | return -EALREADY; |
1177 | ||
3e0c3ff3 | 1178 | return REG_INTERSECT; |
84fa4f43 | 1179 | case REGDOM_SET_BY_USER: |
84fa4f43 | 1180 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) |
9c96477d | 1181 | return REG_INTERSECT; |
fb1fc7ad LR |
1182 | /* |
1183 | * If the user knows better the user should set the regdom | |
1184 | * to their country before the IE is picked up | |
1185 | */ | |
3f2355cb LR |
1186 | if (last_request->initiator == REGDOM_SET_BY_USER && |
1187 | last_request->intersect) | |
1188 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1189 | /* |
1190 | * Process user requests only after previous user/driver/core | |
1191 | * requests have been processed | |
1192 | */ | |
5eebade6 LR |
1193 | if (last_request->initiator == REGDOM_SET_BY_CORE || |
1194 | last_request->initiator == REGDOM_SET_BY_DRIVER || | |
1195 | last_request->initiator == REGDOM_SET_BY_USER) { | |
69b1572b | 1196 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1197 | return -EAGAIN; |
1198 | } | |
1199 | ||
e74b1e7f | 1200 | if (!is_old_static_regdom(cfg80211_regdomain) && |
69b1572b | 1201 | !regdom_changes(alpha2)) |
e74b1e7f LR |
1202 | return -EALREADY; |
1203 | ||
84fa4f43 JB |
1204 | return 0; |
1205 | } | |
1206 | ||
1207 | return -EINVAL; | |
1208 | } | |
1209 | ||
a1794390 | 1210 | /* Caller must hold &cfg80211_mutex */ |
b2e1b302 | 1211 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, |
3f2355cb LR |
1212 | const char *alpha2, |
1213 | u32 country_ie_checksum, | |
1214 | enum environment_cap env) | |
b2e1b302 LR |
1215 | { |
1216 | struct regulatory_request *request; | |
9c96477d | 1217 | bool intersect = false; |
b2e1b302 LR |
1218 | int r = 0; |
1219 | ||
761cf7ec LR |
1220 | assert_cfg80211_lock(); |
1221 | ||
be3d4810 | 1222 | r = ignore_request(wiphy, set_by, alpha2); |
9c96477d | 1223 | |
3e0c3ff3 LR |
1224 | if (r == REG_INTERSECT) { |
1225 | if (set_by == REGDOM_SET_BY_DRIVER) { | |
1226 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); | |
1227 | if (r) | |
1228 | return r; | |
1229 | } | |
9c96477d | 1230 | intersect = true; |
3e0c3ff3 | 1231 | } else if (r) { |
fb1fc7ad LR |
1232 | /* |
1233 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1234 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1235 | * wiphy |
1236 | */ | |
3e0c3ff3 LR |
1237 | if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) { |
1238 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); | |
1239 | if (r) | |
1240 | return r; | |
1241 | r = -EALREADY; | |
1242 | goto new_request; | |
1243 | } | |
b2e1b302 | 1244 | return r; |
3e0c3ff3 | 1245 | } |
b2e1b302 | 1246 | |
3e0c3ff3 | 1247 | new_request: |
5203cdb6 LR |
1248 | request = kzalloc(sizeof(struct regulatory_request), |
1249 | GFP_KERNEL); | |
1250 | if (!request) | |
1251 | return -ENOMEM; | |
1252 | ||
1253 | request->alpha2[0] = alpha2[0]; | |
1254 | request->alpha2[1] = alpha2[1]; | |
1255 | request->initiator = set_by; | |
806a9e39 | 1256 | request->wiphy_idx = get_wiphy_idx(wiphy); |
5203cdb6 | 1257 | request->intersect = intersect; |
3f2355cb LR |
1258 | request->country_ie_checksum = country_ie_checksum; |
1259 | request->country_ie_env = env; | |
5203cdb6 LR |
1260 | |
1261 | kfree(last_request); | |
1262 | last_request = request; | |
3e0c3ff3 LR |
1263 | |
1264 | /* When r == REG_INTERSECT we do need to call CRDA */ | |
1265 | if (r < 0) | |
1266 | return r; | |
1267 | ||
3f2355cb LR |
1268 | /* |
1269 | * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled | |
1270 | * AND if CRDA is NOT present nothing will happen, if someone | |
1271 | * wants to bother with 11d with OLD_REG you can add a timer. | |
1272 | * If after x amount of time nothing happens you can call: | |
1273 | * | |
1274 | * return set_regdom(country_ie_regdomain); | |
1275 | * | |
1276 | * to intersect with the static rd | |
1277 | */ | |
02ba0b32 | 1278 | return call_crda(alpha2); |
b2e1b302 LR |
1279 | } |
1280 | ||
fe33eb39 LR |
1281 | /* This currently only processes user and driver regulatory hints */ |
1282 | static int reg_process_hint(struct regulatory_request *reg_request) | |
1283 | { | |
1284 | int r = 0; | |
1285 | struct wiphy *wiphy = NULL; | |
1286 | ||
1287 | BUG_ON(!reg_request->alpha2); | |
1288 | ||
1289 | mutex_lock(&cfg80211_mutex); | |
1290 | ||
1291 | if (wiphy_idx_valid(reg_request->wiphy_idx)) | |
1292 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1293 | ||
1294 | if (reg_request->initiator == REGDOM_SET_BY_DRIVER && | |
1295 | !wiphy) { | |
1296 | r = -ENODEV; | |
1297 | goto out; | |
1298 | } | |
1299 | ||
1300 | r = __regulatory_hint(wiphy, | |
1301 | reg_request->initiator, | |
1302 | reg_request->alpha2, | |
1303 | reg_request->country_ie_checksum, | |
1304 | reg_request->country_ie_env); | |
1305 | /* This is required so that the orig_* parameters are saved */ | |
1306 | if (r == -EALREADY && wiphy && wiphy->strict_regulatory) | |
1307 | wiphy_update_regulatory(wiphy, reg_request->initiator); | |
1308 | out: | |
1309 | mutex_unlock(&cfg80211_mutex); | |
1310 | ||
1311 | if (r == -EALREADY) | |
1312 | r = 0; | |
1313 | ||
1314 | return r; | |
1315 | } | |
1316 | ||
1317 | static void reg_process_pending_hints(void) | |
1318 | { | |
1319 | struct regulatory_request *reg_request; | |
1320 | int r; | |
1321 | ||
1322 | spin_lock(®_requests_lock); | |
1323 | while (!list_empty(®_requests_list)) { | |
1324 | reg_request = list_first_entry(®_requests_list, | |
1325 | struct regulatory_request, | |
1326 | list); | |
1327 | list_del_init(®_request->list); | |
1328 | spin_unlock(®_requests_lock); | |
1329 | ||
1330 | r = reg_process_hint(reg_request); | |
1331 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1332 | if (r && (reg_request->initiator == REGDOM_SET_BY_DRIVER || | |
1333 | reg_request->initiator == REGDOM_SET_BY_COUNTRY_IE)) | |
1334 | printk(KERN_ERR "cfg80211: wiphy_idx %d sent a " | |
1335 | "regulatory hint for %c%c but now has " | |
1336 | "gone fishing, ignoring request\n", | |
1337 | reg_request->wiphy_idx, | |
1338 | reg_request->alpha2[0], | |
1339 | reg_request->alpha2[1]); | |
1340 | #endif | |
1341 | kfree(reg_request); | |
1342 | spin_lock(®_requests_lock); | |
1343 | } | |
1344 | spin_unlock(®_requests_lock); | |
1345 | } | |
1346 | ||
1347 | static void reg_todo(struct work_struct *work) | |
1348 | { | |
1349 | reg_process_pending_hints(); | |
1350 | } | |
1351 | ||
1352 | static DECLARE_WORK(reg_work, reg_todo); | |
1353 | ||
1354 | static void queue_regulatory_request(struct regulatory_request *request) | |
1355 | { | |
1356 | spin_lock(®_requests_lock); | |
1357 | list_add_tail(&request->list, ®_requests_list); | |
1358 | spin_unlock(®_requests_lock); | |
1359 | ||
1360 | schedule_work(®_work); | |
1361 | } | |
1362 | ||
1363 | /* Core regulatory hint -- happens once during cfg80211_init() */ | |
ba25c141 LR |
1364 | static int regulatory_hint_core(const char *alpha2) |
1365 | { | |
1366 | struct regulatory_request *request; | |
1367 | ||
1368 | BUG_ON(last_request); | |
1369 | ||
1370 | request = kzalloc(sizeof(struct regulatory_request), | |
1371 | GFP_KERNEL); | |
1372 | if (!request) | |
1373 | return -ENOMEM; | |
1374 | ||
1375 | request->alpha2[0] = alpha2[0]; | |
1376 | request->alpha2[1] = alpha2[1]; | |
1377 | request->initiator = REGDOM_SET_BY_CORE; | |
1378 | ||
fe33eb39 | 1379 | queue_regulatory_request(request); |
ba25c141 | 1380 | |
fe33eb39 | 1381 | return 0; |
ba25c141 LR |
1382 | } |
1383 | ||
fe33eb39 LR |
1384 | /* User hints */ |
1385 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1386 | { |
fe33eb39 LR |
1387 | struct regulatory_request *request; |
1388 | ||
be3d4810 | 1389 | BUG_ON(!alpha2); |
b2e1b302 | 1390 | |
fe33eb39 LR |
1391 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1392 | if (!request) | |
1393 | return -ENOMEM; | |
1394 | ||
1395 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1396 | request->alpha2[0] = alpha2[0]; | |
1397 | request->alpha2[1] = alpha2[1]; | |
1398 | request->initiator = REGDOM_SET_BY_USER, | |
1399 | ||
1400 | queue_regulatory_request(request); | |
1401 | ||
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | /* Driver hints */ | |
1406 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1407 | { | |
1408 | struct regulatory_request *request; | |
1409 | ||
1410 | BUG_ON(!alpha2); | |
1411 | BUG_ON(!wiphy); | |
1412 | ||
1413 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1414 | if (!request) | |
1415 | return -ENOMEM; | |
1416 | ||
1417 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1418 | ||
1419 | /* Must have registered wiphy first */ | |
1420 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1421 | ||
1422 | request->alpha2[0] = alpha2[0]; | |
1423 | request->alpha2[1] = alpha2[1]; | |
1424 | request->initiator = REGDOM_SET_BY_DRIVER; | |
1425 | ||
1426 | queue_regulatory_request(request); | |
1427 | ||
1428 | return 0; | |
b2e1b302 LR |
1429 | } |
1430 | EXPORT_SYMBOL(regulatory_hint); | |
1431 | ||
3f2355cb LR |
1432 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, |
1433 | u32 country_ie_checksum) | |
1434 | { | |
806a9e39 LR |
1435 | struct wiphy *request_wiphy; |
1436 | ||
761cf7ec LR |
1437 | assert_cfg80211_lock(); |
1438 | ||
806a9e39 LR |
1439 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1440 | ||
1441 | if (!request_wiphy) | |
3f2355cb | 1442 | return false; |
806a9e39 LR |
1443 | |
1444 | if (likely(request_wiphy != wiphy)) | |
3f2355cb | 1445 | return !country_ie_integrity_changes(country_ie_checksum); |
fb1fc7ad LR |
1446 | /* |
1447 | * We should not have let these through at this point, they | |
3f2355cb | 1448 | * should have been picked up earlier by the first alpha2 check |
fb1fc7ad LR |
1449 | * on the device |
1450 | */ | |
3f2355cb LR |
1451 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) |
1452 | return true; | |
1453 | return false; | |
1454 | } | |
1455 | ||
1456 | void regulatory_hint_11d(struct wiphy *wiphy, | |
1457 | u8 *country_ie, | |
1458 | u8 country_ie_len) | |
1459 | { | |
1460 | struct ieee80211_regdomain *rd = NULL; | |
1461 | char alpha2[2]; | |
1462 | u32 checksum = 0; | |
1463 | enum environment_cap env = ENVIRON_ANY; | |
fe33eb39 | 1464 | struct regulatory_request *request; |
3f2355cb | 1465 | |
a1794390 | 1466 | mutex_lock(&cfg80211_mutex); |
3f2355cb | 1467 | |
d335fe63 LR |
1468 | if (unlikely(!last_request)) { |
1469 | mutex_unlock(&cfg80211_mutex); | |
1470 | return; | |
1471 | } | |
1472 | ||
3f2355cb LR |
1473 | /* IE len must be evenly divisible by 2 */ |
1474 | if (country_ie_len & 0x01) | |
1475 | goto out; | |
1476 | ||
1477 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1478 | goto out; | |
1479 | ||
fb1fc7ad LR |
1480 | /* |
1481 | * Pending country IE processing, this can happen after we | |
3f2355cb | 1482 | * call CRDA and wait for a response if a beacon was received before |
fb1fc7ad LR |
1483 | * we were able to process the last regulatory_hint_11d() call |
1484 | */ | |
3f2355cb LR |
1485 | if (country_ie_regdomain) |
1486 | goto out; | |
1487 | ||
1488 | alpha2[0] = country_ie[0]; | |
1489 | alpha2[1] = country_ie[1]; | |
1490 | ||
1491 | if (country_ie[2] == 'I') | |
1492 | env = ENVIRON_INDOOR; | |
1493 | else if (country_ie[2] == 'O') | |
1494 | env = ENVIRON_OUTDOOR; | |
1495 | ||
fb1fc7ad LR |
1496 | /* |
1497 | * We will run this for *every* beacon processed for the BSSID, so | |
3f2355cb | 1498 | * we optimize an early check to exit out early if we don't have to |
fb1fc7ad LR |
1499 | * do anything |
1500 | */ | |
806a9e39 | 1501 | if (likely(wiphy_idx_valid(last_request->wiphy_idx))) { |
3f2355cb LR |
1502 | struct cfg80211_registered_device *drv_last_ie; |
1503 | ||
806a9e39 LR |
1504 | drv_last_ie = |
1505 | cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx); | |
3f2355cb | 1506 | |
fb1fc7ad LR |
1507 | /* |
1508 | * Lets keep this simple -- we trust the first AP | |
1509 | * after we intersect with CRDA | |
1510 | */ | |
806a9e39 | 1511 | if (likely(&drv_last_ie->wiphy == wiphy)) { |
fb1fc7ad LR |
1512 | /* |
1513 | * Ignore IEs coming in on this wiphy with | |
1514 | * the same alpha2 and environment cap | |
1515 | */ | |
3f2355cb LR |
1516 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, |
1517 | alpha2) && | |
1518 | env == drv_last_ie->env)) { | |
1519 | goto out; | |
1520 | } | |
fb1fc7ad LR |
1521 | /* |
1522 | * the wiphy moved on to another BSSID or the AP | |
3f2355cb LR |
1523 | * was reconfigured. XXX: We need to deal with the |
1524 | * case where the user suspends and goes to goes | |
1525 | * to another country, and then gets IEs from an | |
fb1fc7ad LR |
1526 | * AP with different settings |
1527 | */ | |
3f2355cb LR |
1528 | goto out; |
1529 | } else { | |
fb1fc7ad LR |
1530 | /* |
1531 | * Ignore IEs coming in on two separate wiphys with | |
1532 | * the same alpha2 and environment cap | |
1533 | */ | |
3f2355cb LR |
1534 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, |
1535 | alpha2) && | |
1536 | env == drv_last_ie->env)) { | |
1537 | goto out; | |
1538 | } | |
1539 | /* We could potentially intersect though */ | |
1540 | goto out; | |
1541 | } | |
1542 | } | |
1543 | ||
1544 | rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); | |
1545 | if (!rd) | |
1546 | goto out; | |
1547 | ||
915278e0 LR |
1548 | /* |
1549 | * This will not happen right now but we leave it here for the | |
3f2355cb LR |
1550 | * the future when we want to add suspend/resume support and having |
1551 | * the user move to another country after doing so, or having the user | |
915278e0 LR |
1552 | * move to another AP. Right now we just trust the first AP. |
1553 | * | |
1554 | * If we hit this before we add this support we want to be informed of | |
1555 | * it as it would indicate a mistake in the current design | |
1556 | */ | |
1557 | if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum))) | |
0441d6ff | 1558 | goto free_rd_out; |
3f2355cb | 1559 | |
fe33eb39 LR |
1560 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1561 | if (!request) | |
1562 | goto free_rd_out; | |
1563 | ||
fb1fc7ad LR |
1564 | /* |
1565 | * We keep this around for when CRDA comes back with a response so | |
1566 | * we can intersect with that | |
1567 | */ | |
3f2355cb LR |
1568 | country_ie_regdomain = rd; |
1569 | ||
fe33eb39 LR |
1570 | request->wiphy_idx = get_wiphy_idx(wiphy); |
1571 | request->alpha2[0] = rd->alpha2[0]; | |
1572 | request->alpha2[1] = rd->alpha2[1]; | |
1573 | request->initiator = REGDOM_SET_BY_COUNTRY_IE; | |
1574 | request->country_ie_checksum = checksum; | |
1575 | request->country_ie_env = env; | |
1576 | ||
1577 | mutex_unlock(&cfg80211_mutex); | |
3f2355cb | 1578 | |
fe33eb39 LR |
1579 | queue_regulatory_request(request); |
1580 | ||
1581 | return; | |
0441d6ff LR |
1582 | |
1583 | free_rd_out: | |
1584 | kfree(rd); | |
3f2355cb | 1585 | out: |
a1794390 | 1586 | mutex_unlock(&cfg80211_mutex); |
3f2355cb LR |
1587 | } |
1588 | EXPORT_SYMBOL(regulatory_hint_11d); | |
b2e1b302 | 1589 | |
a3d2eaf0 | 1590 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1591 | { |
1592 | unsigned int i; | |
a3d2eaf0 JB |
1593 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1594 | const struct ieee80211_freq_range *freq_range = NULL; | |
1595 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
1596 | |
1597 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
1598 | "(max_antenna_gain, max_eirp)\n"); | |
1599 | ||
1600 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1601 | reg_rule = &rd->reg_rules[i]; | |
1602 | freq_range = ®_rule->freq_range; | |
1603 | power_rule = ®_rule->power_rule; | |
1604 | ||
fb1fc7ad LR |
1605 | /* |
1606 | * There may not be documentation for max antenna gain | |
1607 | * in certain regions | |
1608 | */ | |
b2e1b302 LR |
1609 | if (power_rule->max_antenna_gain) |
1610 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1611 | "(%d mBi, %d mBm)\n", | |
1612 | freq_range->start_freq_khz, | |
1613 | freq_range->end_freq_khz, | |
1614 | freq_range->max_bandwidth_khz, | |
1615 | power_rule->max_antenna_gain, | |
1616 | power_rule->max_eirp); | |
1617 | else | |
1618 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1619 | "(N/A, %d mBm)\n", | |
1620 | freq_range->start_freq_khz, | |
1621 | freq_range->end_freq_khz, | |
1622 | freq_range->max_bandwidth_khz, | |
1623 | power_rule->max_eirp); | |
1624 | } | |
1625 | } | |
1626 | ||
a3d2eaf0 | 1627 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1628 | { |
1629 | ||
3f2355cb | 1630 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb LR |
1631 | |
1632 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 LR |
1633 | struct cfg80211_registered_device *drv; |
1634 | drv = cfg80211_drv_by_wiphy_idx( | |
1635 | last_request->wiphy_idx); | |
1636 | if (drv) { | |
3f2355cb LR |
1637 | printk(KERN_INFO "cfg80211: Current regulatory " |
1638 | "domain updated by AP to: %c%c\n", | |
1639 | drv->country_ie_alpha2[0], | |
1640 | drv->country_ie_alpha2[1]); | |
1641 | } else | |
1642 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1643 | "domain intersected: \n"); | |
1644 | } else | |
1645 | printk(KERN_INFO "cfg80211: Current regulatory " | |
039498c6 | 1646 | "domain intersected: \n"); |
3f2355cb | 1647 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
1648 | printk(KERN_INFO "cfg80211: World regulatory " |
1649 | "domain updated:\n"); | |
1650 | else { | |
1651 | if (is_unknown_alpha2(rd->alpha2)) | |
1652 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1653 | "changed to driver built-in settings " | |
1654 | "(unknown country)\n"); | |
1655 | else | |
1656 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1657 | "changed to country: %c%c\n", | |
1658 | rd->alpha2[0], rd->alpha2[1]); | |
1659 | } | |
1660 | print_rd_rules(rd); | |
1661 | } | |
1662 | ||
2df78167 | 1663 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1664 | { |
1665 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1666 | rd->alpha2[0], rd->alpha2[1]); | |
1667 | print_rd_rules(rd); | |
1668 | } | |
1669 | ||
3f2355cb LR |
1670 | #ifdef CONFIG_CFG80211_REG_DEBUG |
1671 | static void reg_country_ie_process_debug( | |
1672 | const struct ieee80211_regdomain *rd, | |
1673 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1674 | const struct ieee80211_regdomain *intersected_rd) | |
1675 | { | |
1676 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
1677 | print_regdomain_info(country_ie_regdomain); | |
1678 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
1679 | print_regdomain_info(rd); | |
1680 | if (intersected_rd) { | |
1681 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
1682 | "and get:\n"); | |
667ecd01 | 1683 | print_regdomain_info(intersected_rd); |
3f2355cb LR |
1684 | return; |
1685 | } | |
1686 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
1687 | } | |
1688 | #else | |
1689 | static inline void reg_country_ie_process_debug( | |
1690 | const struct ieee80211_regdomain *rd, | |
1691 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1692 | const struct ieee80211_regdomain *intersected_rd) | |
1693 | { | |
1694 | } | |
1695 | #endif | |
1696 | ||
d2372b31 | 1697 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1698 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1699 | { |
9c96477d | 1700 | const struct ieee80211_regdomain *intersected_rd = NULL; |
3f2355cb | 1701 | struct cfg80211_registered_device *drv = NULL; |
806a9e39 | 1702 | struct wiphy *request_wiphy; |
b2e1b302 LR |
1703 | /* Some basic sanity checks first */ |
1704 | ||
b2e1b302 | 1705 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1706 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1707 | return -EINVAL; |
1708 | update_world_regdomain(rd); | |
1709 | return 0; | |
1710 | } | |
b2e1b302 LR |
1711 | |
1712 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1713 | !is_unknown_alpha2(rd->alpha2)) | |
1714 | return -EINVAL; | |
1715 | ||
f6037d09 | 1716 | if (!last_request) |
b2e1b302 LR |
1717 | return -EINVAL; |
1718 | ||
fb1fc7ad LR |
1719 | /* |
1720 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 1721 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
1722 | * and the pending request came in from a country IE |
1723 | */ | |
3f2355cb | 1724 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
1725 | /* |
1726 | * If someone else asked us to change the rd lets only bother | |
1727 | * checking if the alpha2 changes if CRDA was already called | |
1728 | */ | |
3f2355cb | 1729 | if (!is_old_static_regdom(cfg80211_regdomain) && |
69b1572b | 1730 | !regdom_changes(rd->alpha2)) |
3f2355cb LR |
1731 | return -EINVAL; |
1732 | } | |
1733 | ||
fb1fc7ad LR |
1734 | /* |
1735 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
1736 | * and finally inform them of what we have done, in case they want |
1737 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
1738 | * internal EEPROM data |
1739 | */ | |
b2e1b302 | 1740 | |
f6037d09 | 1741 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1742 | return -EINVAL; |
1743 | ||
8375af3b LR |
1744 | if (!is_valid_rd(rd)) { |
1745 | printk(KERN_ERR "cfg80211: Invalid " | |
1746 | "regulatory domain detected:\n"); | |
1747 | print_regdomain_info(rd); | |
1748 | return -EINVAL; | |
b2e1b302 LR |
1749 | } |
1750 | ||
806a9e39 LR |
1751 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1752 | ||
b8295acd | 1753 | if (!last_request->intersect) { |
3e0c3ff3 LR |
1754 | int r; |
1755 | ||
1756 | if (last_request->initiator != REGDOM_SET_BY_DRIVER) { | |
1757 | reset_regdomains(); | |
1758 | cfg80211_regdomain = rd; | |
1759 | return 0; | |
1760 | } | |
1761 | ||
fb1fc7ad LR |
1762 | /* |
1763 | * For a driver hint, lets copy the regulatory domain the | |
1764 | * driver wanted to the wiphy to deal with conflicts | |
1765 | */ | |
3e0c3ff3 | 1766 | |
806a9e39 | 1767 | BUG_ON(request_wiphy->regd); |
3e0c3ff3 | 1768 | |
806a9e39 | 1769 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
1770 | if (r) |
1771 | return r; | |
1772 | ||
b8295acd LR |
1773 | reset_regdomains(); |
1774 | cfg80211_regdomain = rd; | |
1775 | return 0; | |
1776 | } | |
1777 | ||
1778 | /* Intersection requires a bit more work */ | |
1779 | ||
1780 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
1781 | ||
9c96477d LR |
1782 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
1783 | if (!intersected_rd) | |
1784 | return -EINVAL; | |
b8295acd | 1785 | |
fb1fc7ad LR |
1786 | /* |
1787 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 1788 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
1789 | * domain we keep it for its private use |
1790 | */ | |
3e0c3ff3 | 1791 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) |
806a9e39 | 1792 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
1793 | else |
1794 | kfree(rd); | |
1795 | ||
b8295acd LR |
1796 | rd = NULL; |
1797 | ||
1798 | reset_regdomains(); | |
1799 | cfg80211_regdomain = intersected_rd; | |
1800 | ||
1801 | return 0; | |
9c96477d LR |
1802 | } |
1803 | ||
3f2355cb LR |
1804 | /* |
1805 | * Country IE requests are handled a bit differently, we intersect | |
1806 | * the country IE rd with what CRDA believes that country should have | |
1807 | */ | |
1808 | ||
1809 | BUG_ON(!country_ie_regdomain); | |
1810 | ||
1811 | if (rd != country_ie_regdomain) { | |
fb1fc7ad LR |
1812 | /* |
1813 | * Intersect what CRDA returned and our what we | |
1814 | * had built from the Country IE received | |
1815 | */ | |
3f2355cb LR |
1816 | |
1817 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); | |
1818 | ||
1819 | reg_country_ie_process_debug(rd, country_ie_regdomain, | |
1820 | intersected_rd); | |
1821 | ||
1822 | kfree(country_ie_regdomain); | |
1823 | country_ie_regdomain = NULL; | |
1824 | } else { | |
fb1fc7ad LR |
1825 | /* |
1826 | * This would happen when CRDA was not present and | |
3f2355cb | 1827 | * OLD_REGULATORY was enabled. We intersect our Country |
fb1fc7ad LR |
1828 | * IE rd and what was set on cfg80211 originally |
1829 | */ | |
3f2355cb LR |
1830 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
1831 | } | |
1832 | ||
1833 | if (!intersected_rd) | |
1834 | return -EINVAL; | |
1835 | ||
806a9e39 | 1836 | drv = wiphy_to_dev(request_wiphy); |
3f2355cb LR |
1837 | |
1838 | drv->country_ie_alpha2[0] = rd->alpha2[0]; | |
1839 | drv->country_ie_alpha2[1] = rd->alpha2[1]; | |
1840 | drv->env = last_request->country_ie_env; | |
1841 | ||
1842 | BUG_ON(intersected_rd == rd); | |
1843 | ||
1844 | kfree(rd); | |
1845 | rd = NULL; | |
1846 | ||
b8295acd | 1847 | reset_regdomains(); |
3f2355cb | 1848 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
1849 | |
1850 | return 0; | |
1851 | } | |
1852 | ||
1853 | ||
fb1fc7ad LR |
1854 | /* |
1855 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 1856 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
1857 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
1858 | */ | |
a3d2eaf0 | 1859 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1860 | { |
b2e1b302 LR |
1861 | int r; |
1862 | ||
761cf7ec LR |
1863 | assert_cfg80211_lock(); |
1864 | ||
b2e1b302 LR |
1865 | /* Note that this doesn't update the wiphys, this is done below */ |
1866 | r = __set_regdom(rd); | |
d2372b31 JB |
1867 | if (r) { |
1868 | kfree(rd); | |
b2e1b302 | 1869 | return r; |
d2372b31 | 1870 | } |
b2e1b302 | 1871 | |
b2e1b302 | 1872 | /* This would make this whole thing pointless */ |
a01ddafd LR |
1873 | if (!last_request->intersect) |
1874 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
1875 | |
1876 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 1877 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 1878 | |
a01ddafd | 1879 | print_regdomain(cfg80211_regdomain); |
b2e1b302 LR |
1880 | |
1881 | return r; | |
1882 | } | |
1883 | ||
a1794390 | 1884 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
1885 | void reg_device_remove(struct wiphy *wiphy) |
1886 | { | |
806a9e39 LR |
1887 | struct wiphy *request_wiphy; |
1888 | ||
761cf7ec LR |
1889 | assert_cfg80211_lock(); |
1890 | ||
806a9e39 LR |
1891 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1892 | ||
3e0c3ff3 | 1893 | kfree(wiphy->regd); |
806a9e39 | 1894 | if (!last_request || !request_wiphy) |
3f2355cb | 1895 | return; |
806a9e39 | 1896 | if (request_wiphy != wiphy) |
3f2355cb | 1897 | return; |
806a9e39 | 1898 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb LR |
1899 | last_request->country_ie_env = ENVIRON_ANY; |
1900 | } | |
1901 | ||
b2e1b302 LR |
1902 | int regulatory_init(void) |
1903 | { | |
bcf4f99b | 1904 | int err = 0; |
734366de | 1905 | |
b2e1b302 LR |
1906 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
1907 | if (IS_ERR(reg_pdev)) | |
1908 | return PTR_ERR(reg_pdev); | |
734366de | 1909 | |
fe33eb39 LR |
1910 | spin_lock_init(®_requests_lock); |
1911 | ||
734366de | 1912 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY |
a3d2eaf0 | 1913 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 1914 | |
942b25cf | 1915 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de | 1916 | print_regdomain_info(cfg80211_regdomain); |
fb1fc7ad LR |
1917 | /* |
1918 | * The old code still requests for a new regdomain and if | |
734366de JB |
1919 | * you have CRDA you get it updated, otherwise you get |
1920 | * stuck with the static values. We ignore "EU" code as | |
fb1fc7ad LR |
1921 | * that is not a valid ISO / IEC 3166 alpha2 |
1922 | */ | |
ac9440a4 | 1923 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') |
ba25c141 | 1924 | err = regulatory_hint_core(ieee80211_regdom); |
734366de | 1925 | #else |
a3d2eaf0 | 1926 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 1927 | |
ba25c141 | 1928 | err = regulatory_hint_core("00"); |
bcf4f99b | 1929 | #endif |
ba25c141 | 1930 | if (err) { |
bcf4f99b LR |
1931 | if (err == -ENOMEM) |
1932 | return err; | |
1933 | /* | |
1934 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
1935 | * memory which is handled and propagated appropriately above | |
1936 | * but it can also fail during a netlink_broadcast() or during | |
1937 | * early boot for call_usermodehelper(). For now treat these | |
1938 | * errors as non-fatal. | |
1939 | */ | |
1940 | printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " | |
1941 | "to call CRDA during init"); | |
1942 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1943 | /* We want to find out exactly why when debugging */ | |
1944 | WARN_ON(err); | |
734366de | 1945 | #endif |
bcf4f99b | 1946 | } |
734366de | 1947 | |
b2e1b302 LR |
1948 | return 0; |
1949 | } | |
1950 | ||
1951 | void regulatory_exit(void) | |
1952 | { | |
fe33eb39 LR |
1953 | struct regulatory_request *reg_request, *tmp; |
1954 | ||
1955 | cancel_work_sync(®_work); | |
1956 | ||
a1794390 | 1957 | mutex_lock(&cfg80211_mutex); |
734366de | 1958 | |
b2e1b302 | 1959 | reset_regdomains(); |
734366de | 1960 | |
3f2355cb LR |
1961 | kfree(country_ie_regdomain); |
1962 | country_ie_regdomain = NULL; | |
1963 | ||
f6037d09 JB |
1964 | kfree(last_request); |
1965 | ||
b2e1b302 | 1966 | platform_device_unregister(reg_pdev); |
734366de | 1967 | |
fe33eb39 LR |
1968 | spin_lock(®_requests_lock); |
1969 | if (!list_empty(®_requests_list)) { | |
1970 | list_for_each_entry_safe(reg_request, tmp, | |
1971 | ®_requests_list, list) { | |
1972 | list_del(®_request->list); | |
1973 | kfree(reg_request); | |
1974 | } | |
1975 | } | |
1976 | spin_unlock(®_requests_lock); | |
1977 | ||
a1794390 | 1978 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 1979 | } |