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Commit | Line | Data |
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8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
b2e1b302 | 5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
8318d78a JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
b2e1b302 LR |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
14 | * |
15 | * The usual implementation is for a driver to read a device EEPROM to | |
16 | * determine which regulatory domain it should be operating under, then | |
17 | * looking up the allowable channels in a driver-local table and finally | |
18 | * registering those channels in the wiphy structure. | |
19 | * | |
b2e1b302 LR |
20 | * Another set of compliance enforcement is for drivers to use their |
21 | * own compliance limits which can be stored on the EEPROM. The host | |
22 | * driver or firmware may ensure these are used. | |
23 | * | |
24 | * In addition to all this we provide an extra layer of regulatory | |
25 | * conformance. For drivers which do not have any regulatory | |
26 | * information CRDA provides the complete regulatory solution. | |
27 | * For others it provides a community effort on further restrictions | |
28 | * to enhance compliance. | |
29 | * | |
30 | * Note: When number of rules --> infinity we will not be able to | |
31 | * index on alpha2 any more, instead we'll probably have to | |
32 | * rely on some SHA1 checksum of the regdomain for example. | |
33 | * | |
8318d78a JB |
34 | */ |
35 | #include <linux/kernel.h> | |
b2e1b302 LR |
36 | #include <linux/list.h> |
37 | #include <linux/random.h> | |
38 | #include <linux/nl80211.h> | |
39 | #include <linux/platform_device.h> | |
8318d78a | 40 | #include <net/wireless.h> |
b2e1b302 | 41 | #include <net/cfg80211.h> |
8318d78a | 42 | #include "core.h" |
b2e1b302 | 43 | #include "reg.h" |
73d54c9e | 44 | #include "nl80211.h" |
8318d78a | 45 | |
5166ccd2 | 46 | /* Receipt of information from last regulatory request */ |
f6037d09 | 47 | static struct regulatory_request *last_request; |
734366de | 48 | |
b2e1b302 LR |
49 | /* To trigger userspace events */ |
50 | static struct platform_device *reg_pdev; | |
8318d78a | 51 | |
b2e1b302 LR |
52 | /* Keep the ordering from large to small */ |
53 | static u32 supported_bandwidths[] = { | |
54 | MHZ_TO_KHZ(40), | |
55 | MHZ_TO_KHZ(20), | |
8318d78a JB |
56 | }; |
57 | ||
fb1fc7ad LR |
58 | /* |
59 | * Central wireless core regulatory domains, we only need two, | |
734366de | 60 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
61 | * information to give us an alpha2 |
62 | */ | |
f130347c | 63 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 64 | |
fb1fc7ad LR |
65 | /* |
66 | * We use this as a place for the rd structure built from the | |
3f2355cb | 67 | * last parsed country IE to rest until CRDA gets back to us with |
fb1fc7ad LR |
68 | * what it thinks should apply for the same country |
69 | */ | |
3f2355cb LR |
70 | static const struct ieee80211_regdomain *country_ie_regdomain; |
71 | ||
e38f8a7a | 72 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
73 | static LIST_HEAD(reg_requests_list); |
74 | static spinlock_t reg_requests_lock; | |
75 | ||
e38f8a7a LR |
76 | /* Used to queue up beacon hints for review */ |
77 | static LIST_HEAD(reg_pending_beacons); | |
78 | static spinlock_t reg_pending_beacons_lock; | |
79 | ||
80 | /* Used to keep track of processed beacon hints */ | |
81 | static LIST_HEAD(reg_beacon_list); | |
82 | ||
83 | struct reg_beacon { | |
84 | struct list_head list; | |
85 | struct ieee80211_channel chan; | |
86 | }; | |
87 | ||
734366de JB |
88 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
89 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 90 | .n_reg_rules = 5, |
734366de JB |
91 | .alpha2 = "00", |
92 | .reg_rules = { | |
68798a62 LR |
93 | /* IEEE 802.11b/g, channels 1..11 */ |
94 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
95 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
96 | * channel fits here. */ | |
97 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
98 | NL80211_RRF_PASSIVE_SCAN | |
99 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
100 | /* IEEE 802.11 channel 14 - Only JP enables |
101 | * this and for 802.11b only */ | |
102 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
103 | NL80211_RRF_PASSIVE_SCAN | | |
104 | NL80211_RRF_NO_IBSS | | |
105 | NL80211_RRF_NO_OFDM), | |
106 | /* IEEE 802.11a, channel 36..48 */ | |
ec329ace | 107 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
108 | NL80211_RRF_PASSIVE_SCAN | |
109 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
110 | |
111 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
112 | ||
113 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 114 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
115 | NL80211_RRF_PASSIVE_SCAN | |
116 | NL80211_RRF_NO_IBSS), | |
734366de JB |
117 | } |
118 | }; | |
119 | ||
a3d2eaf0 JB |
120 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
121 | &world_regdom; | |
734366de JB |
122 | |
123 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
124 | static char *ieee80211_regdom = "US"; | |
125 | module_param(ieee80211_regdom, charp, 0444); | |
126 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
127 | ||
fb1fc7ad LR |
128 | /* |
129 | * We assume 40 MHz bandwidth for the old regulatory work. | |
734366de | 130 | * We make emphasis we are using the exact same frequencies |
fb1fc7ad LR |
131 | * as before |
132 | */ | |
734366de JB |
133 | |
134 | static const struct ieee80211_regdomain us_regdom = { | |
135 | .n_reg_rules = 6, | |
136 | .alpha2 = "US", | |
137 | .reg_rules = { | |
138 | /* IEEE 802.11b/g, channels 1..11 */ | |
139 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
140 | /* IEEE 802.11a, channel 36 */ | |
141 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
142 | /* IEEE 802.11a, channel 40 */ | |
143 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
144 | /* IEEE 802.11a, channel 44 */ | |
145 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
146 | /* IEEE 802.11a, channels 48..64 */ | |
147 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
148 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
149 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
150 | } | |
151 | }; | |
152 | ||
153 | static const struct ieee80211_regdomain jp_regdom = { | |
154 | .n_reg_rules = 3, | |
155 | .alpha2 = "JP", | |
156 | .reg_rules = { | |
157 | /* IEEE 802.11b/g, channels 1..14 */ | |
158 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
159 | /* IEEE 802.11a, channels 34..48 */ | |
160 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
161 | NL80211_RRF_PASSIVE_SCAN), | |
162 | /* IEEE 802.11a, channels 52..64 */ | |
163 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
164 | NL80211_RRF_NO_IBSS | | |
165 | NL80211_RRF_DFS), | |
166 | } | |
167 | }; | |
168 | ||
169 | static const struct ieee80211_regdomain eu_regdom = { | |
170 | .n_reg_rules = 6, | |
fb1fc7ad LR |
171 | /* |
172 | * This alpha2 is bogus, we leave it here just for stupid | |
173 | * backward compatibility | |
174 | */ | |
734366de JB |
175 | .alpha2 = "EU", |
176 | .reg_rules = { | |
177 | /* IEEE 802.11b/g, channels 1..13 */ | |
178 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
179 | /* IEEE 802.11a, channel 36 */ | |
180 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
181 | NL80211_RRF_PASSIVE_SCAN), | |
182 | /* IEEE 802.11a, channel 40 */ | |
183 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
184 | NL80211_RRF_PASSIVE_SCAN), | |
185 | /* IEEE 802.11a, channel 44 */ | |
186 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
187 | NL80211_RRF_PASSIVE_SCAN), | |
188 | /* IEEE 802.11a, channels 48..64 */ | |
189 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
190 | NL80211_RRF_NO_IBSS | | |
191 | NL80211_RRF_DFS), | |
192 | /* IEEE 802.11a, channels 100..140 */ | |
193 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
194 | NL80211_RRF_NO_IBSS | | |
195 | NL80211_RRF_DFS), | |
196 | } | |
197 | }; | |
198 | ||
199 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
200 | { | |
201 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
202 | return &us_regdom; | |
203 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
204 | return &jp_regdom; | |
205 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
206 | return &eu_regdom; | |
207 | /* Default, as per the old rules */ | |
208 | return &us_regdom; | |
209 | } | |
210 | ||
a3d2eaf0 | 211 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
212 | { |
213 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
214 | return true; | |
215 | return false; | |
216 | } | |
942b25cf JB |
217 | #else |
218 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 219 | { |
942b25cf | 220 | return false; |
734366de | 221 | } |
942b25cf JB |
222 | #endif |
223 | ||
734366de JB |
224 | static void reset_regdomains(void) |
225 | { | |
942b25cf JB |
226 | /* avoid freeing static information or freeing something twice */ |
227 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
228 | cfg80211_regdomain = NULL; | |
229 | if (cfg80211_world_regdom == &world_regdom) | |
230 | cfg80211_world_regdom = NULL; | |
231 | if (cfg80211_regdomain == &world_regdom) | |
232 | cfg80211_regdomain = NULL; | |
233 | if (is_old_static_regdom(cfg80211_regdomain)) | |
234 | cfg80211_regdomain = NULL; | |
235 | ||
236 | kfree(cfg80211_regdomain); | |
237 | kfree(cfg80211_world_regdom); | |
734366de | 238 | |
a3d2eaf0 | 239 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
240 | cfg80211_regdomain = NULL; |
241 | } | |
242 | ||
fb1fc7ad LR |
243 | /* |
244 | * Dynamic world regulatory domain requested by the wireless | |
245 | * core upon initialization | |
246 | */ | |
a3d2eaf0 | 247 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 248 | { |
f6037d09 | 249 | BUG_ON(!last_request); |
734366de JB |
250 | |
251 | reset_regdomains(); | |
252 | ||
253 | cfg80211_world_regdom = rd; | |
254 | cfg80211_regdomain = rd; | |
255 | } | |
734366de | 256 | |
a3d2eaf0 | 257 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
258 | { |
259 | if (!alpha2) | |
260 | return false; | |
261 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
262 | return true; | |
263 | return false; | |
264 | } | |
8318d78a | 265 | |
a3d2eaf0 | 266 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
267 | { |
268 | if (!alpha2) | |
269 | return false; | |
270 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
271 | return true; | |
272 | return false; | |
273 | } | |
8318d78a | 274 | |
b2e1b302 LR |
275 | static bool is_alpha_upper(char letter) |
276 | { | |
277 | /* ASCII A - Z */ | |
278 | if (letter >= 65 && letter <= 90) | |
279 | return true; | |
280 | return false; | |
281 | } | |
8318d78a | 282 | |
a3d2eaf0 | 283 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
284 | { |
285 | if (!alpha2) | |
286 | return false; | |
fb1fc7ad LR |
287 | /* |
288 | * Special case where regulatory domain was built by driver | |
289 | * but a specific alpha2 cannot be determined | |
290 | */ | |
b2e1b302 LR |
291 | if (alpha2[0] == '9' && alpha2[1] == '9') |
292 | return true; | |
293 | return false; | |
294 | } | |
8318d78a | 295 | |
3f2355cb LR |
296 | static bool is_intersected_alpha2(const char *alpha2) |
297 | { | |
298 | if (!alpha2) | |
299 | return false; | |
fb1fc7ad LR |
300 | /* |
301 | * Special case where regulatory domain is the | |
3f2355cb | 302 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
303 | * structures |
304 | */ | |
3f2355cb LR |
305 | if (alpha2[0] == '9' && alpha2[1] == '8') |
306 | return true; | |
307 | return false; | |
308 | } | |
309 | ||
a3d2eaf0 | 310 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
311 | { |
312 | if (!alpha2) | |
313 | return false; | |
314 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
315 | return true; | |
316 | return false; | |
317 | } | |
8318d78a | 318 | |
a3d2eaf0 | 319 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
320 | { |
321 | if (!alpha2_x || !alpha2_y) | |
322 | return false; | |
323 | if (alpha2_x[0] == alpha2_y[0] && | |
324 | alpha2_x[1] == alpha2_y[1]) | |
325 | return true; | |
326 | return false; | |
327 | } | |
328 | ||
69b1572b | 329 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 330 | { |
761cf7ec LR |
331 | assert_cfg80211_lock(); |
332 | ||
b2e1b302 LR |
333 | if (!cfg80211_regdomain) |
334 | return true; | |
335 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
336 | return false; | |
337 | return true; | |
338 | } | |
339 | ||
3f2355cb LR |
340 | /** |
341 | * country_ie_integrity_changes - tells us if the country IE has changed | |
342 | * @checksum: checksum of country IE of fields we are interested in | |
343 | * | |
344 | * If the country IE has not changed you can ignore it safely. This is | |
345 | * useful to determine if two devices are seeing two different country IEs | |
346 | * even on the same alpha2. Note that this will return false if no IE has | |
347 | * been set on the wireless core yet. | |
348 | */ | |
349 | static bool country_ie_integrity_changes(u32 checksum) | |
350 | { | |
351 | /* If no IE has been set then the checksum doesn't change */ | |
352 | if (unlikely(!last_request->country_ie_checksum)) | |
353 | return false; | |
354 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
355 | return true; | |
356 | return false; | |
357 | } | |
358 | ||
fb1fc7ad LR |
359 | /* |
360 | * This lets us keep regulatory code which is updated on a regulatory | |
361 | * basis in userspace. | |
362 | */ | |
b2e1b302 LR |
363 | static int call_crda(const char *alpha2) |
364 | { | |
365 | char country_env[9 + 2] = "COUNTRY="; | |
366 | char *envp[] = { | |
367 | country_env, | |
368 | NULL | |
369 | }; | |
370 | ||
371 | if (!is_world_regdom((char *) alpha2)) | |
372 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
373 | alpha2[0], alpha2[1]); | |
374 | else | |
b2e1b302 LR |
375 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
376 | "regulatory domain\n"); | |
b2e1b302 LR |
377 | |
378 | country_env[8] = alpha2[0]; | |
379 | country_env[9] = alpha2[1]; | |
380 | ||
381 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
382 | } | |
383 | ||
b2e1b302 | 384 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 385 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 386 | { |
f6037d09 JB |
387 | if (!last_request) |
388 | return false; | |
389 | ||
390 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 391 | } |
8318d78a | 392 | |
b2e1b302 | 393 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 394 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 395 | { |
a3d2eaf0 | 396 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
397 | u32 freq_diff; |
398 | ||
91e99004 | 399 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
400 | return false; |
401 | ||
402 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
403 | return false; | |
404 | ||
405 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
406 | ||
bd05f28e RK |
407 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
408 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
409 | return false; |
410 | ||
411 | return true; | |
412 | } | |
413 | ||
a3d2eaf0 | 414 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 415 | { |
a3d2eaf0 | 416 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 417 | unsigned int i; |
8318d78a | 418 | |
b2e1b302 LR |
419 | if (!rd->n_reg_rules) |
420 | return false; | |
8318d78a | 421 | |
88dc1c3f LR |
422 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
423 | return false; | |
424 | ||
b2e1b302 LR |
425 | for (i = 0; i < rd->n_reg_rules; i++) { |
426 | reg_rule = &rd->reg_rules[i]; | |
427 | if (!is_valid_reg_rule(reg_rule)) | |
428 | return false; | |
429 | } | |
430 | ||
431 | return true; | |
8318d78a JB |
432 | } |
433 | ||
b2e1b302 LR |
434 | /* Returns value in KHz */ |
435 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
436 | u32 freq) | |
437 | { | |
438 | unsigned int i; | |
439 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
440 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
441 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
442 | if (start_freq_khz >= freq_range->start_freq_khz && | |
443 | end_freq_khz <= freq_range->end_freq_khz) | |
444 | return supported_bandwidths[i]; | |
445 | } | |
446 | return 0; | |
447 | } | |
8318d78a | 448 | |
0c7dc45d LR |
449 | /** |
450 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
451 | * @freq_range: frequency rule we want to query | |
452 | * @freq_khz: frequency we are inquiring about | |
453 | * | |
454 | * This lets us know if a specific frequency rule is or is not relevant to | |
455 | * a specific frequency's band. Bands are device specific and artificial | |
456 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
457 | * safe for now to assume that a frequency rule should not be part of a | |
458 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
459 | * This resolution can be lowered and should be considered as we add | |
460 | * regulatory rule support for other "bands". | |
461 | **/ | |
462 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
463 | u32 freq_khz) | |
464 | { | |
465 | #define ONE_GHZ_IN_KHZ 1000000 | |
466 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
467 | return true; | |
468 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
469 | return true; | |
470 | return false; | |
471 | #undef ONE_GHZ_IN_KHZ | |
472 | } | |
473 | ||
fb1fc7ad LR |
474 | /* |
475 | * Converts a country IE to a regulatory domain. A regulatory domain | |
3f2355cb LR |
476 | * structure has a lot of information which the IE doesn't yet have, |
477 | * so for the other values we use upper max values as we will intersect | |
fb1fc7ad LR |
478 | * with our userspace regulatory agent to get lower bounds. |
479 | */ | |
3f2355cb LR |
480 | static struct ieee80211_regdomain *country_ie_2_rd( |
481 | u8 *country_ie, | |
482 | u8 country_ie_len, | |
483 | u32 *checksum) | |
484 | { | |
485 | struct ieee80211_regdomain *rd = NULL; | |
486 | unsigned int i = 0; | |
487 | char alpha2[2]; | |
488 | u32 flags = 0; | |
489 | u32 num_rules = 0, size_of_regd = 0; | |
490 | u8 *triplets_start = NULL; | |
491 | u8 len_at_triplet = 0; | |
492 | /* the last channel we have registered in a subband (triplet) */ | |
493 | int last_sub_max_channel = 0; | |
494 | ||
495 | *checksum = 0xDEADBEEF; | |
496 | ||
497 | /* Country IE requirements */ | |
498 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
499 | country_ie_len & 0x01); | |
500 | ||
501 | alpha2[0] = country_ie[0]; | |
502 | alpha2[1] = country_ie[1]; | |
503 | ||
504 | /* | |
505 | * Third octet can be: | |
506 | * 'I' - Indoor | |
507 | * 'O' - Outdoor | |
508 | * | |
509 | * anything else we assume is no restrictions | |
510 | */ | |
511 | if (country_ie[2] == 'I') | |
512 | flags = NL80211_RRF_NO_OUTDOOR; | |
513 | else if (country_ie[2] == 'O') | |
514 | flags = NL80211_RRF_NO_INDOOR; | |
515 | ||
516 | country_ie += 3; | |
517 | country_ie_len -= 3; | |
518 | ||
519 | triplets_start = country_ie; | |
520 | len_at_triplet = country_ie_len; | |
521 | ||
522 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
523 | ||
fb1fc7ad LR |
524 | /* |
525 | * We need to build a reg rule for each triplet, but first we must | |
3f2355cb | 526 | * calculate the number of reg rules we will need. We will need one |
fb1fc7ad LR |
527 | * for each channel subband |
528 | */ | |
3f2355cb | 529 | while (country_ie_len >= 3) { |
615aab4b | 530 | int end_channel = 0; |
3f2355cb LR |
531 | struct ieee80211_country_ie_triplet *triplet = |
532 | (struct ieee80211_country_ie_triplet *) country_ie; | |
533 | int cur_sub_max_channel = 0, cur_channel = 0; | |
534 | ||
535 | if (triplet->ext.reg_extension_id >= | |
536 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
537 | country_ie += 3; | |
538 | country_ie_len -= 3; | |
539 | continue; | |
540 | } | |
541 | ||
615aab4b LR |
542 | /* 2 GHz */ |
543 | if (triplet->chans.first_channel <= 14) | |
544 | end_channel = triplet->chans.first_channel + | |
545 | triplet->chans.num_channels; | |
546 | else | |
547 | /* | |
548 | * 5 GHz -- For example in country IEs if the first | |
549 | * channel given is 36 and the number of channels is 4 | |
550 | * then the individual channel numbers defined for the | |
551 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
552 | * and not 36, 37, 38, 39. | |
553 | * | |
554 | * See: http://tinyurl.com/11d-clarification | |
555 | */ | |
556 | end_channel = triplet->chans.first_channel + | |
557 | (4 * (triplet->chans.num_channels - 1)); | |
558 | ||
3f2355cb | 559 | cur_channel = triplet->chans.first_channel; |
615aab4b | 560 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
561 | |
562 | /* Basic sanity check */ | |
563 | if (cur_sub_max_channel < cur_channel) | |
564 | return NULL; | |
565 | ||
fb1fc7ad LR |
566 | /* |
567 | * Do not allow overlapping channels. Also channels | |
3f2355cb | 568 | * passed in each subband must be monotonically |
fb1fc7ad LR |
569 | * increasing |
570 | */ | |
3f2355cb LR |
571 | if (last_sub_max_channel) { |
572 | if (cur_channel <= last_sub_max_channel) | |
573 | return NULL; | |
574 | if (cur_sub_max_channel <= last_sub_max_channel) | |
575 | return NULL; | |
576 | } | |
577 | ||
fb1fc7ad LR |
578 | /* |
579 | * When dot11RegulatoryClassesRequired is supported | |
3f2355cb LR |
580 | * we can throw ext triplets as part of this soup, |
581 | * for now we don't care when those change as we | |
fb1fc7ad LR |
582 | * don't support them |
583 | */ | |
3f2355cb LR |
584 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | |
585 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
586 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
587 | ||
588 | last_sub_max_channel = cur_sub_max_channel; | |
589 | ||
590 | country_ie += 3; | |
591 | country_ie_len -= 3; | |
592 | num_rules++; | |
593 | ||
fb1fc7ad LR |
594 | /* |
595 | * Note: this is not a IEEE requirement but | |
596 | * simply a memory requirement | |
597 | */ | |
3f2355cb LR |
598 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) |
599 | return NULL; | |
600 | } | |
601 | ||
602 | country_ie = triplets_start; | |
603 | country_ie_len = len_at_triplet; | |
604 | ||
605 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
606 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
607 | ||
608 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
609 | if (!rd) | |
610 | return NULL; | |
611 | ||
612 | rd->n_reg_rules = num_rules; | |
613 | rd->alpha2[0] = alpha2[0]; | |
614 | rd->alpha2[1] = alpha2[1]; | |
615 | ||
616 | /* This time around we fill in the rd */ | |
617 | while (country_ie_len >= 3) { | |
02e68a3d | 618 | int end_channel = 0; |
3f2355cb LR |
619 | struct ieee80211_country_ie_triplet *triplet = |
620 | (struct ieee80211_country_ie_triplet *) country_ie; | |
621 | struct ieee80211_reg_rule *reg_rule = NULL; | |
622 | struct ieee80211_freq_range *freq_range = NULL; | |
623 | struct ieee80211_power_rule *power_rule = NULL; | |
624 | ||
fb1fc7ad LR |
625 | /* |
626 | * Must parse if dot11RegulatoryClassesRequired is true, | |
627 | * we don't support this yet | |
628 | */ | |
3f2355cb LR |
629 | if (triplet->ext.reg_extension_id >= |
630 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
631 | country_ie += 3; | |
632 | country_ie_len -= 3; | |
633 | continue; | |
634 | } | |
635 | ||
636 | reg_rule = &rd->reg_rules[i]; | |
637 | freq_range = ®_rule->freq_range; | |
638 | power_rule = ®_rule->power_rule; | |
639 | ||
640 | reg_rule->flags = flags; | |
641 | ||
02e68a3d LR |
642 | /* 2 GHz */ |
643 | if (triplet->chans.first_channel <= 14) | |
644 | end_channel = triplet->chans.first_channel + | |
645 | triplet->chans.num_channels; | |
646 | else | |
02e68a3d LR |
647 | end_channel = triplet->chans.first_channel + |
648 | (4 * (triplet->chans.num_channels - 1)); | |
649 | ||
fb1fc7ad LR |
650 | /* |
651 | * The +10 is since the regulatory domain expects | |
3f2355cb LR |
652 | * the actual band edge, not the center of freq for |
653 | * its start and end freqs, assuming 20 MHz bandwidth on | |
fb1fc7ad LR |
654 | * the channels passed |
655 | */ | |
3f2355cb LR |
656 | freq_range->start_freq_khz = |
657 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
658 | triplet->chans.first_channel) - 10); | |
659 | freq_range->end_freq_khz = | |
660 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 661 | end_channel) + 10); |
3f2355cb | 662 | |
fb1fc7ad LR |
663 | /* |
664 | * These are large arbitrary values we use to intersect later. | |
665 | * Increment this if we ever support >= 40 MHz channels | |
666 | * in IEEE 802.11 | |
667 | */ | |
3f2355cb LR |
668 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); |
669 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
670 | power_rule->max_eirp = DBM_TO_MBM(100); | |
671 | ||
672 | country_ie += 3; | |
673 | country_ie_len -= 3; | |
674 | i++; | |
675 | ||
676 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
677 | } | |
678 | ||
679 | return rd; | |
680 | } | |
681 | ||
682 | ||
fb1fc7ad LR |
683 | /* |
684 | * Helper for regdom_intersect(), this does the real | |
685 | * mathematical intersection fun | |
686 | */ | |
9c96477d LR |
687 | static int reg_rules_intersect( |
688 | const struct ieee80211_reg_rule *rule1, | |
689 | const struct ieee80211_reg_rule *rule2, | |
690 | struct ieee80211_reg_rule *intersected_rule) | |
691 | { | |
692 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
693 | struct ieee80211_freq_range *freq_range; | |
694 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
695 | struct ieee80211_power_rule *power_rule; | |
696 | u32 freq_diff; | |
697 | ||
698 | freq_range1 = &rule1->freq_range; | |
699 | freq_range2 = &rule2->freq_range; | |
700 | freq_range = &intersected_rule->freq_range; | |
701 | ||
702 | power_rule1 = &rule1->power_rule; | |
703 | power_rule2 = &rule2->power_rule; | |
704 | power_rule = &intersected_rule->power_rule; | |
705 | ||
706 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
707 | freq_range2->start_freq_khz); | |
708 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
709 | freq_range2->end_freq_khz); | |
710 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
711 | freq_range2->max_bandwidth_khz); | |
712 | ||
713 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
714 | if (freq_range->max_bandwidth_khz > freq_diff) | |
715 | freq_range->max_bandwidth_khz = freq_diff; | |
716 | ||
717 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
718 | power_rule2->max_eirp); | |
719 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
720 | power_rule2->max_antenna_gain); | |
721 | ||
722 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
723 | ||
724 | if (!is_valid_reg_rule(intersected_rule)) | |
725 | return -EINVAL; | |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
730 | /** | |
731 | * regdom_intersect - do the intersection between two regulatory domains | |
732 | * @rd1: first regulatory domain | |
733 | * @rd2: second regulatory domain | |
734 | * | |
735 | * Use this function to get the intersection between two regulatory domains. | |
736 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
737 | * as no one single alpha2 can represent this regulatory domain. | |
738 | * | |
739 | * Returns a pointer to the regulatory domain structure which will hold the | |
740 | * resulting intersection of rules between rd1 and rd2. We will | |
741 | * kzalloc() this structure for you. | |
742 | */ | |
743 | static struct ieee80211_regdomain *regdom_intersect( | |
744 | const struct ieee80211_regdomain *rd1, | |
745 | const struct ieee80211_regdomain *rd2) | |
746 | { | |
747 | int r, size_of_regd; | |
748 | unsigned int x, y; | |
749 | unsigned int num_rules = 0, rule_idx = 0; | |
750 | const struct ieee80211_reg_rule *rule1, *rule2; | |
751 | struct ieee80211_reg_rule *intersected_rule; | |
752 | struct ieee80211_regdomain *rd; | |
753 | /* This is just a dummy holder to help us count */ | |
754 | struct ieee80211_reg_rule irule; | |
755 | ||
756 | /* Uses the stack temporarily for counter arithmetic */ | |
757 | intersected_rule = &irule; | |
758 | ||
759 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
760 | ||
761 | if (!rd1 || !rd2) | |
762 | return NULL; | |
763 | ||
fb1fc7ad LR |
764 | /* |
765 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
766 | * build them. This is to so we can malloc() and free() a |
767 | * regdomain once. The reason we use reg_rules_intersect() here | |
768 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
769 | * All rules that do check out OK are valid. |
770 | */ | |
9c96477d LR |
771 | |
772 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
773 | rule1 = &rd1->reg_rules[x]; | |
774 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
775 | rule2 = &rd2->reg_rules[y]; | |
776 | if (!reg_rules_intersect(rule1, rule2, | |
777 | intersected_rule)) | |
778 | num_rules++; | |
779 | memset(intersected_rule, 0, | |
780 | sizeof(struct ieee80211_reg_rule)); | |
781 | } | |
782 | } | |
783 | ||
784 | if (!num_rules) | |
785 | return NULL; | |
786 | ||
787 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
788 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
789 | ||
790 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
791 | if (!rd) | |
792 | return NULL; | |
793 | ||
794 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
795 | rule1 = &rd1->reg_rules[x]; | |
796 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
797 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
798 | /* |
799 | * This time around instead of using the stack lets | |
9c96477d | 800 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
801 | * a memcpy() |
802 | */ | |
9c96477d LR |
803 | intersected_rule = &rd->reg_rules[rule_idx]; |
804 | r = reg_rules_intersect(rule1, rule2, | |
805 | intersected_rule); | |
fb1fc7ad LR |
806 | /* |
807 | * No need to memset here the intersected rule here as | |
808 | * we're not using the stack anymore | |
809 | */ | |
9c96477d LR |
810 | if (r) |
811 | continue; | |
812 | rule_idx++; | |
813 | } | |
814 | } | |
815 | ||
816 | if (rule_idx != num_rules) { | |
817 | kfree(rd); | |
818 | return NULL; | |
819 | } | |
820 | ||
821 | rd->n_reg_rules = num_rules; | |
822 | rd->alpha2[0] = '9'; | |
823 | rd->alpha2[1] = '8'; | |
824 | ||
825 | return rd; | |
826 | } | |
827 | ||
fb1fc7ad LR |
828 | /* |
829 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
830 | * want to just have the channel structure use these | |
831 | */ | |
b2e1b302 LR |
832 | static u32 map_regdom_flags(u32 rd_flags) |
833 | { | |
834 | u32 channel_flags = 0; | |
835 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
836 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
837 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
838 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
839 | if (rd_flags & NL80211_RRF_DFS) | |
840 | channel_flags |= IEEE80211_CHAN_RADAR; | |
841 | return channel_flags; | |
842 | } | |
843 | ||
1fa25e41 LR |
844 | static int freq_reg_info_regd(struct wiphy *wiphy, |
845 | u32 center_freq, | |
846 | u32 *bandwidth, | |
847 | const struct ieee80211_reg_rule **reg_rule, | |
848 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
849 | { |
850 | int i; | |
0c7dc45d | 851 | bool band_rule_found = false; |
3e0c3ff3 | 852 | const struct ieee80211_regdomain *regd; |
b2e1b302 | 853 | u32 max_bandwidth = 0; |
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 | ||
b2e1b302 | 886 | max_bandwidth = freq_max_bandwidth(fr, center_freq); |
0c7dc45d | 887 | |
b2e1b302 LR |
888 | if (max_bandwidth && *bandwidth <= max_bandwidth) { |
889 | *reg_rule = rr; | |
890 | *bandwidth = max_bandwidth; | |
8318d78a JB |
891 | break; |
892 | } | |
893 | } | |
894 | ||
0c7dc45d LR |
895 | if (!band_rule_found) |
896 | return -ERANGE; | |
897 | ||
b2e1b302 LR |
898 | return !max_bandwidth; |
899 | } | |
34f57347 | 900 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 901 | |
34f57347 | 902 | int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth, |
1fa25e41 LR |
903 | const struct ieee80211_reg_rule **reg_rule) |
904 | { | |
905 | return freq_reg_info_regd(wiphy, center_freq, | |
906 | bandwidth, reg_rule, NULL); | |
907 | } | |
b2e1b302 | 908 | |
a92a3ce7 LR |
909 | static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, |
910 | unsigned int chan_idx) | |
b2e1b302 LR |
911 | { |
912 | int r; | |
a92a3ce7 | 913 | u32 flags; |
b2e1b302 LR |
914 | u32 max_bandwidth = 0; |
915 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
916 | const struct ieee80211_power_rule *power_rule = NULL; | |
a92a3ce7 LR |
917 | struct ieee80211_supported_band *sband; |
918 | struct ieee80211_channel *chan; | |
fe33eb39 | 919 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 920 | |
761cf7ec LR |
921 | assert_cfg80211_lock(); |
922 | ||
806a9e39 LR |
923 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
924 | ||
a92a3ce7 LR |
925 | sband = wiphy->bands[band]; |
926 | BUG_ON(chan_idx >= sband->n_channels); | |
927 | chan = &sband->channels[chan_idx]; | |
928 | ||
929 | flags = chan->orig_flags; | |
b2e1b302 | 930 | |
3e0c3ff3 | 931 | r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq), |
b2e1b302 LR |
932 | &max_bandwidth, ®_rule); |
933 | ||
934 | if (r) { | |
fb1fc7ad LR |
935 | /* |
936 | * This means no regulatory rule was found in the country IE | |
0c7dc45d LR |
937 | * with a frequency range on the center_freq's band, since |
938 | * IEEE-802.11 allows for a country IE to have a subset of the | |
939 | * regulatory information provided in a country we ignore | |
940 | * disabling the channel unless at least one reg rule was | |
941 | * found on the center_freq's band. For details see this | |
942 | * clarification: | |
943 | * | |
944 | * http://tinyurl.com/11d-clarification | |
945 | */ | |
946 | if (r == -ERANGE && | |
7db90f4a LR |
947 | last_request->initiator == |
948 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
0c7dc45d LR |
949 | #ifdef CONFIG_CFG80211_REG_DEBUG |
950 | printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " | |
951 | "intact on %s - no rule found in band on " | |
952 | "Country IE\n", | |
953 | chan->center_freq, wiphy_name(wiphy)); | |
954 | #endif | |
955 | } else { | |
fb1fc7ad LR |
956 | /* |
957 | * In this case we know the country IE has at least one reg rule | |
958 | * for the band so we respect its band definitions | |
959 | */ | |
0c7dc45d | 960 | #ifdef CONFIG_CFG80211_REG_DEBUG |
7db90f4a LR |
961 | if (last_request->initiator == |
962 | NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
0c7dc45d LR |
963 | printk(KERN_DEBUG "cfg80211: Disabling " |
964 | "channel %d MHz on %s due to " | |
965 | "Country IE\n", | |
966 | chan->center_freq, wiphy_name(wiphy)); | |
967 | #endif | |
968 | flags |= IEEE80211_CHAN_DISABLED; | |
969 | chan->flags = flags; | |
970 | } | |
8318d78a JB |
971 | return; |
972 | } | |
973 | ||
b2e1b302 LR |
974 | power_rule = ®_rule->power_rule; |
975 | ||
7db90f4a | 976 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
806a9e39 LR |
977 | request_wiphy && request_wiphy == wiphy && |
978 | request_wiphy->strict_regulatory) { | |
fb1fc7ad LR |
979 | /* |
980 | * This gaurantees the driver's requested regulatory domain | |
f976376d | 981 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
982 | * settings |
983 | */ | |
f976376d LR |
984 | chan->flags = chan->orig_flags = |
985 | map_regdom_flags(reg_rule->flags); | |
986 | chan->max_antenna_gain = chan->orig_mag = | |
987 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
988 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
989 | chan->max_power = chan->orig_mpwr = | |
990 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
991 | return; | |
992 | } | |
993 | ||
b2e1b302 | 994 | chan->flags = flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 995 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
996 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
997 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 998 | if (chan->orig_mpwr) |
b2e1b302 LR |
999 | chan->max_power = min(chan->orig_mpwr, |
1000 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 1001 | else |
b2e1b302 | 1002 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
1003 | } |
1004 | ||
a92a3ce7 | 1005 | static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) |
8318d78a | 1006 | { |
a92a3ce7 LR |
1007 | unsigned int i; |
1008 | struct ieee80211_supported_band *sband; | |
1009 | ||
1010 | BUG_ON(!wiphy->bands[band]); | |
1011 | sband = wiphy->bands[band]; | |
8318d78a JB |
1012 | |
1013 | for (i = 0; i < sband->n_channels; i++) | |
a92a3ce7 | 1014 | handle_channel(wiphy, band, i); |
8318d78a JB |
1015 | } |
1016 | ||
7db90f4a LR |
1017 | static bool ignore_reg_update(struct wiphy *wiphy, |
1018 | enum nl80211_reg_initiator initiator) | |
14b9815a LR |
1019 | { |
1020 | if (!last_request) | |
1021 | return true; | |
7db90f4a | 1022 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
2a44f911 | 1023 | wiphy->custom_regulatory) |
14b9815a | 1024 | return true; |
fb1fc7ad LR |
1025 | /* |
1026 | * wiphy->regd will be set once the device has its own | |
1027 | * desired regulatory domain set | |
1028 | */ | |
f976376d LR |
1029 | if (wiphy->strict_regulatory && !wiphy->regd && |
1030 | !is_world_regdom(last_request->alpha2)) | |
14b9815a LR |
1031 | return true; |
1032 | return false; | |
1033 | } | |
1034 | ||
7db90f4a | 1035 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
8318d78a | 1036 | { |
b2e1b302 | 1037 | struct cfg80211_registered_device *drv; |
8318d78a | 1038 | |
b2e1b302 | 1039 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
7db90f4a | 1040 | wiphy_update_regulatory(&drv->wiphy, initiator); |
b2e1b302 LR |
1041 | } |
1042 | ||
e38f8a7a LR |
1043 | static void handle_reg_beacon(struct wiphy *wiphy, |
1044 | unsigned int chan_idx, | |
1045 | struct reg_beacon *reg_beacon) | |
1046 | { | |
1047 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1048 | #define REG_DEBUG_BEACON_FLAG(desc) \ | |
1049 | printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \ | |
1050 | "frequency: %d MHz (Ch %d) on %s\n", \ | |
1051 | reg_beacon->chan.center_freq, \ | |
1052 | ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \ | |
1053 | wiphy_name(wiphy)); | |
1054 | #else | |
1055 | #define REG_DEBUG_BEACON_FLAG(desc) do {} while (0) | |
1056 | #endif | |
1057 | struct ieee80211_supported_band *sband; | |
1058 | struct ieee80211_channel *chan; | |
1059 | ||
1060 | assert_cfg80211_lock(); | |
1061 | ||
1062 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1063 | chan = &sband->channels[chan_idx]; | |
1064 | ||
1065 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
1066 | return; | |
1067 | ||
1068 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { | |
1069 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; | |
1070 | REG_DEBUG_BEACON_FLAG("active scanning"); | |
1071 | } | |
1072 | ||
1073 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { | |
1074 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; | |
1075 | REG_DEBUG_BEACON_FLAG("beaconing"); | |
1076 | } | |
1077 | ||
1078 | chan->beacon_found = true; | |
1079 | #undef REG_DEBUG_BEACON_FLAG | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * Called when a scan on a wiphy finds a beacon on | |
1084 | * new channel | |
1085 | */ | |
1086 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
1087 | struct reg_beacon *reg_beacon) | |
1088 | { | |
1089 | unsigned int i; | |
1090 | struct ieee80211_supported_band *sband; | |
1091 | ||
1092 | assert_cfg80211_lock(); | |
1093 | ||
1094 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1095 | return; | |
1096 | ||
1097 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1098 | ||
1099 | for (i = 0; i < sband->n_channels; i++) | |
1100 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * Called upon reg changes or a new wiphy is added | |
1105 | */ | |
1106 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1107 | { | |
1108 | unsigned int i; | |
1109 | struct ieee80211_supported_band *sband; | |
1110 | struct reg_beacon *reg_beacon; | |
1111 | ||
1112 | assert_cfg80211_lock(); | |
1113 | ||
1114 | if (list_empty(®_beacon_list)) | |
1115 | return; | |
1116 | ||
1117 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1118 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1119 | continue; | |
1120 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1121 | for (i = 0; i < sband->n_channels; i++) | |
1122 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1127 | { | |
1128 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1129 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1130 | return true; | |
7db90f4a | 1131 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
e38f8a7a LR |
1132 | wiphy->custom_regulatory) |
1133 | return true; | |
1134 | return false; | |
1135 | } | |
1136 | ||
1137 | /* Reap the advantages of previously found beacons */ | |
1138 | static void reg_process_beacons(struct wiphy *wiphy) | |
1139 | { | |
1140 | if (!reg_is_world_roaming(wiphy)) | |
1141 | return; | |
1142 | wiphy_update_beacon_reg(wiphy); | |
1143 | } | |
1144 | ||
7db90f4a LR |
1145 | void wiphy_update_regulatory(struct wiphy *wiphy, |
1146 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1147 | { |
1148 | enum ieee80211_band band; | |
d46e5b1d | 1149 | |
7db90f4a | 1150 | if (ignore_reg_update(wiphy, initiator)) |
e38f8a7a | 1151 | goto out; |
b2e1b302 | 1152 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1153 | if (wiphy->bands[band]) |
a92a3ce7 | 1154 | handle_band(wiphy, band); |
b2e1b302 | 1155 | } |
e38f8a7a LR |
1156 | out: |
1157 | reg_process_beacons(wiphy); | |
560e28e1 | 1158 | if (wiphy->reg_notifier) |
716f9392 | 1159 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1160 | } |
1161 | ||
1fa25e41 LR |
1162 | static void handle_channel_custom(struct wiphy *wiphy, |
1163 | enum ieee80211_band band, | |
1164 | unsigned int chan_idx, | |
1165 | const struct ieee80211_regdomain *regd) | |
1166 | { | |
1167 | int r; | |
1168 | u32 max_bandwidth = 0; | |
1169 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1170 | const struct ieee80211_power_rule *power_rule = NULL; | |
1171 | struct ieee80211_supported_band *sband; | |
1172 | struct ieee80211_channel *chan; | |
1173 | ||
1174 | sband = wiphy->bands[band]; | |
1175 | BUG_ON(chan_idx >= sband->n_channels); | |
1176 | chan = &sband->channels[chan_idx]; | |
1177 | ||
1178 | r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq), | |
1179 | &max_bandwidth, ®_rule, regd); | |
1180 | ||
1181 | if (r) { | |
1182 | chan->flags = IEEE80211_CHAN_DISABLED; | |
1183 | return; | |
1184 | } | |
1185 | ||
1186 | power_rule = ®_rule->power_rule; | |
1187 | ||
1188 | chan->flags |= map_regdom_flags(reg_rule->flags); | |
1189 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
1190 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
1191 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
1192 | } | |
1193 | ||
1194 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1195 | const struct ieee80211_regdomain *regd) | |
1196 | { | |
1197 | unsigned int i; | |
1198 | struct ieee80211_supported_band *sband; | |
1199 | ||
1200 | BUG_ON(!wiphy->bands[band]); | |
1201 | sband = wiphy->bands[band]; | |
1202 | ||
1203 | for (i = 0; i < sband->n_channels; i++) | |
1204 | handle_channel_custom(wiphy, band, i, regd); | |
1205 | } | |
1206 | ||
1207 | /* Used by drivers prior to wiphy registration */ | |
1208 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1209 | const struct ieee80211_regdomain *regd) | |
1210 | { | |
1211 | enum ieee80211_band band; | |
1212 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1213 | if (wiphy->bands[band]) | |
1214 | handle_band_custom(wiphy, band, regd); | |
b2e1b302 LR |
1215 | } |
1216 | } | |
1fa25e41 LR |
1217 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1218 | ||
3e0c3ff3 LR |
1219 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
1220 | const struct ieee80211_regdomain *src_regd) | |
1221 | { | |
1222 | struct ieee80211_regdomain *regd; | |
1223 | int size_of_regd = 0; | |
1224 | unsigned int i; | |
1225 | ||
1226 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1227 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
1228 | ||
1229 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
1230 | if (!regd) | |
1231 | return -ENOMEM; | |
1232 | ||
1233 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
1234 | ||
1235 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
1236 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
1237 | sizeof(struct ieee80211_reg_rule)); | |
1238 | ||
1239 | *dst_regd = regd; | |
1240 | return 0; | |
1241 | } | |
b2e1b302 | 1242 | |
fb1fc7ad LR |
1243 | /* |
1244 | * Return value which can be used by ignore_request() to indicate | |
1245 | * it has been determined we should intersect two regulatory domains | |
1246 | */ | |
9c96477d LR |
1247 | #define REG_INTERSECT 1 |
1248 | ||
84fa4f43 JB |
1249 | /* This has the logic which determines when a new request |
1250 | * should be ignored. */ | |
2f92cd2e LR |
1251 | static int ignore_request(struct wiphy *wiphy, |
1252 | struct regulatory_request *pending_request) | |
84fa4f43 | 1253 | { |
806a9e39 | 1254 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1255 | |
1256 | assert_cfg80211_lock(); | |
1257 | ||
84fa4f43 JB |
1258 | /* All initial requests are respected */ |
1259 | if (!last_request) | |
1260 | return 0; | |
1261 | ||
2f92cd2e | 1262 | switch (pending_request->initiator) { |
7db90f4a | 1263 | case NL80211_REGDOM_SET_BY_CORE: |
ba25c141 | 1264 | return -EINVAL; |
7db90f4a | 1265 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1266 | |
1267 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1268 | ||
2f92cd2e | 1269 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1270 | return -EINVAL; |
7db90f4a LR |
1271 | if (last_request->initiator == |
1272 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1273 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1274 | /* |
1275 | * Two cards with two APs claiming different | |
1276 | * different Country IE alpha2s. We could | |
1277 | * intersect them, but that seems unlikely | |
1278 | * to be correct. Reject second one for now. | |
1279 | */ | |
2f92cd2e | 1280 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1281 | return -EOPNOTSUPP; |
1282 | return -EALREADY; | |
1283 | } | |
fb1fc7ad LR |
1284 | /* |
1285 | * Two consecutive Country IE hints on the same wiphy. | |
1286 | * This should be picked up early by the driver/stack | |
1287 | */ | |
2f92cd2e | 1288 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1289 | return 0; |
1290 | return -EALREADY; | |
1291 | } | |
3f2355cb | 1292 | return REG_INTERSECT; |
7db90f4a LR |
1293 | case NL80211_REGDOM_SET_BY_DRIVER: |
1294 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
e74b1e7f LR |
1295 | if (is_old_static_regdom(cfg80211_regdomain)) |
1296 | return 0; | |
2f92cd2e | 1297 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1298 | return 0; |
84fa4f43 | 1299 | return -EALREADY; |
e74b1e7f | 1300 | } |
fff32c04 LR |
1301 | |
1302 | /* | |
1303 | * This would happen if you unplug and plug your card | |
1304 | * back in or if you add a new device for which the previously | |
1305 | * loaded card also agrees on the regulatory domain. | |
1306 | */ | |
7db90f4a | 1307 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1308 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1309 | return -EALREADY; |
1310 | ||
3e0c3ff3 | 1311 | return REG_INTERSECT; |
7db90f4a LR |
1312 | case NL80211_REGDOM_SET_BY_USER: |
1313 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1314 | return REG_INTERSECT; |
fb1fc7ad LR |
1315 | /* |
1316 | * If the user knows better the user should set the regdom | |
1317 | * to their country before the IE is picked up | |
1318 | */ | |
7db90f4a | 1319 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1320 | last_request->intersect) |
1321 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1322 | /* |
1323 | * Process user requests only after previous user/driver/core | |
1324 | * requests have been processed | |
1325 | */ | |
7db90f4a LR |
1326 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1327 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1328 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
69b1572b | 1329 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1330 | return -EAGAIN; |
1331 | } | |
1332 | ||
e74b1e7f | 1333 | if (!is_old_static_regdom(cfg80211_regdomain) && |
2f92cd2e | 1334 | !regdom_changes(pending_request->alpha2)) |
e74b1e7f LR |
1335 | return -EALREADY; |
1336 | ||
84fa4f43 JB |
1337 | return 0; |
1338 | } | |
1339 | ||
1340 | return -EINVAL; | |
1341 | } | |
1342 | ||
d1c96a9a LR |
1343 | /** |
1344 | * __regulatory_hint - hint to the wireless core a regulatory domain | |
1345 | * @wiphy: if the hint comes from country information from an AP, this | |
1346 | * is required to be set to the wiphy that received the information | |
28da32d7 | 1347 | * @pending_request: the regulatory request currently being processed |
d1c96a9a LR |
1348 | * |
1349 | * The Wireless subsystem can use this function to hint to the wireless core | |
28da32d7 | 1350 | * what it believes should be the current regulatory domain. |
d1c96a9a LR |
1351 | * |
1352 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1353 | * already been set or other standard error codes. | |
1354 | * | |
1355 | * Caller must hold &cfg80211_mutex | |
1356 | */ | |
28da32d7 LR |
1357 | static int __regulatory_hint(struct wiphy *wiphy, |
1358 | struct regulatory_request *pending_request) | |
b2e1b302 | 1359 | { |
9c96477d | 1360 | bool intersect = false; |
b2e1b302 LR |
1361 | int r = 0; |
1362 | ||
761cf7ec LR |
1363 | assert_cfg80211_lock(); |
1364 | ||
2f92cd2e | 1365 | r = ignore_request(wiphy, pending_request); |
9c96477d | 1366 | |
3e0c3ff3 | 1367 | if (r == REG_INTERSECT) { |
7db90f4a LR |
1368 | if (pending_request->initiator == |
1369 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1370 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1371 | if (r) { |
1372 | kfree(pending_request); | |
3e0c3ff3 | 1373 | return r; |
d951c1dd | 1374 | } |
3e0c3ff3 | 1375 | } |
9c96477d | 1376 | intersect = true; |
3e0c3ff3 | 1377 | } else if (r) { |
fb1fc7ad LR |
1378 | /* |
1379 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1380 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1381 | * wiphy |
1382 | */ | |
28da32d7 | 1383 | if (r == -EALREADY && |
7db90f4a LR |
1384 | pending_request->initiator == |
1385 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1386 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1387 | if (r) { |
1388 | kfree(pending_request); | |
3e0c3ff3 | 1389 | return r; |
d951c1dd | 1390 | } |
3e0c3ff3 LR |
1391 | r = -EALREADY; |
1392 | goto new_request; | |
1393 | } | |
d951c1dd | 1394 | kfree(pending_request); |
b2e1b302 | 1395 | return r; |
3e0c3ff3 | 1396 | } |
b2e1b302 | 1397 | |
3e0c3ff3 | 1398 | new_request: |
d951c1dd | 1399 | kfree(last_request); |
5203cdb6 | 1400 | |
d951c1dd LR |
1401 | last_request = pending_request; |
1402 | last_request->intersect = intersect; | |
5203cdb6 | 1403 | |
d951c1dd | 1404 | pending_request = NULL; |
3e0c3ff3 LR |
1405 | |
1406 | /* When r == REG_INTERSECT we do need to call CRDA */ | |
73d54c9e LR |
1407 | if (r < 0) { |
1408 | /* | |
1409 | * Since CRDA will not be called in this case as we already | |
1410 | * have applied the requested regulatory domain before we just | |
1411 | * inform userspace we have processed the request | |
1412 | */ | |
1413 | if (r == -EALREADY) | |
1414 | nl80211_send_reg_change_event(last_request); | |
3e0c3ff3 | 1415 | return r; |
73d54c9e | 1416 | } |
3e0c3ff3 | 1417 | |
3f2355cb LR |
1418 | /* |
1419 | * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled | |
1420 | * AND if CRDA is NOT present nothing will happen, if someone | |
1421 | * wants to bother with 11d with OLD_REG you can add a timer. | |
1422 | * If after x amount of time nothing happens you can call: | |
1423 | * | |
1424 | * return set_regdom(country_ie_regdomain); | |
1425 | * | |
1426 | * to intersect with the static rd | |
1427 | */ | |
d951c1dd | 1428 | return call_crda(last_request->alpha2); |
b2e1b302 LR |
1429 | } |
1430 | ||
fe33eb39 | 1431 | /* This currently only processes user and driver regulatory hints */ |
d951c1dd | 1432 | static void reg_process_hint(struct regulatory_request *reg_request) |
fe33eb39 LR |
1433 | { |
1434 | int r = 0; | |
1435 | struct wiphy *wiphy = NULL; | |
1436 | ||
1437 | BUG_ON(!reg_request->alpha2); | |
1438 | ||
1439 | mutex_lock(&cfg80211_mutex); | |
1440 | ||
1441 | if (wiphy_idx_valid(reg_request->wiphy_idx)) | |
1442 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1443 | ||
7db90f4a | 1444 | if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
fe33eb39 | 1445 | !wiphy) { |
d951c1dd | 1446 | kfree(reg_request); |
fe33eb39 LR |
1447 | goto out; |
1448 | } | |
1449 | ||
28da32d7 | 1450 | r = __regulatory_hint(wiphy, reg_request); |
fe33eb39 LR |
1451 | /* This is required so that the orig_* parameters are saved */ |
1452 | if (r == -EALREADY && wiphy && wiphy->strict_regulatory) | |
1453 | wiphy_update_regulatory(wiphy, reg_request->initiator); | |
1454 | out: | |
1455 | mutex_unlock(&cfg80211_mutex); | |
fe33eb39 LR |
1456 | } |
1457 | ||
7db90f4a | 1458 | /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */ |
fe33eb39 LR |
1459 | static void reg_process_pending_hints(void) |
1460 | { | |
1461 | struct regulatory_request *reg_request; | |
fe33eb39 LR |
1462 | |
1463 | spin_lock(®_requests_lock); | |
1464 | while (!list_empty(®_requests_list)) { | |
1465 | reg_request = list_first_entry(®_requests_list, | |
1466 | struct regulatory_request, | |
1467 | list); | |
1468 | list_del_init(®_request->list); | |
fe33eb39 | 1469 | |
d951c1dd LR |
1470 | spin_unlock(®_requests_lock); |
1471 | reg_process_hint(reg_request); | |
fe33eb39 LR |
1472 | spin_lock(®_requests_lock); |
1473 | } | |
1474 | spin_unlock(®_requests_lock); | |
1475 | } | |
1476 | ||
e38f8a7a LR |
1477 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1478 | static void reg_process_pending_beacon_hints(void) | |
1479 | { | |
1480 | struct cfg80211_registered_device *drv; | |
1481 | struct reg_beacon *pending_beacon, *tmp; | |
1482 | ||
1483 | mutex_lock(&cfg80211_mutex); | |
1484 | ||
1485 | /* This goes through the _pending_ beacon list */ | |
1486 | spin_lock_bh(®_pending_beacons_lock); | |
1487 | ||
1488 | if (list_empty(®_pending_beacons)) { | |
1489 | spin_unlock_bh(®_pending_beacons_lock); | |
1490 | goto out; | |
1491 | } | |
1492 | ||
1493 | list_for_each_entry_safe(pending_beacon, tmp, | |
1494 | ®_pending_beacons, list) { | |
1495 | ||
1496 | list_del_init(&pending_beacon->list); | |
1497 | ||
1498 | /* Applies the beacon hint to current wiphys */ | |
1499 | list_for_each_entry(drv, &cfg80211_drv_list, list) | |
1500 | wiphy_update_new_beacon(&drv->wiphy, pending_beacon); | |
1501 | ||
1502 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
1503 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
1504 | } | |
1505 | ||
1506 | spin_unlock_bh(®_pending_beacons_lock); | |
1507 | out: | |
1508 | mutex_unlock(&cfg80211_mutex); | |
1509 | } | |
1510 | ||
fe33eb39 LR |
1511 | static void reg_todo(struct work_struct *work) |
1512 | { | |
1513 | reg_process_pending_hints(); | |
e38f8a7a | 1514 | reg_process_pending_beacon_hints(); |
fe33eb39 LR |
1515 | } |
1516 | ||
1517 | static DECLARE_WORK(reg_work, reg_todo); | |
1518 | ||
1519 | static void queue_regulatory_request(struct regulatory_request *request) | |
1520 | { | |
1521 | spin_lock(®_requests_lock); | |
1522 | list_add_tail(&request->list, ®_requests_list); | |
1523 | spin_unlock(®_requests_lock); | |
1524 | ||
1525 | schedule_work(®_work); | |
1526 | } | |
1527 | ||
1528 | /* Core regulatory hint -- happens once during cfg80211_init() */ | |
ba25c141 LR |
1529 | static int regulatory_hint_core(const char *alpha2) |
1530 | { | |
1531 | struct regulatory_request *request; | |
1532 | ||
1533 | BUG_ON(last_request); | |
1534 | ||
1535 | request = kzalloc(sizeof(struct regulatory_request), | |
1536 | GFP_KERNEL); | |
1537 | if (!request) | |
1538 | return -ENOMEM; | |
1539 | ||
1540 | request->alpha2[0] = alpha2[0]; | |
1541 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1542 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
ba25c141 | 1543 | |
fe33eb39 | 1544 | queue_regulatory_request(request); |
ba25c141 | 1545 | |
fe33eb39 | 1546 | return 0; |
ba25c141 LR |
1547 | } |
1548 | ||
fe33eb39 LR |
1549 | /* User hints */ |
1550 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1551 | { |
fe33eb39 LR |
1552 | struct regulatory_request *request; |
1553 | ||
be3d4810 | 1554 | BUG_ON(!alpha2); |
b2e1b302 | 1555 | |
fe33eb39 LR |
1556 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1557 | if (!request) | |
1558 | return -ENOMEM; | |
1559 | ||
1560 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1561 | request->alpha2[0] = alpha2[0]; | |
1562 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1563 | request->initiator = NL80211_REGDOM_SET_BY_USER, |
fe33eb39 LR |
1564 | |
1565 | queue_regulatory_request(request); | |
1566 | ||
1567 | return 0; | |
1568 | } | |
1569 | ||
1570 | /* Driver hints */ | |
1571 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1572 | { | |
1573 | struct regulatory_request *request; | |
1574 | ||
1575 | BUG_ON(!alpha2); | |
1576 | BUG_ON(!wiphy); | |
1577 | ||
1578 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1579 | if (!request) | |
1580 | return -ENOMEM; | |
1581 | ||
1582 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1583 | ||
1584 | /* Must have registered wiphy first */ | |
1585 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1586 | ||
1587 | request->alpha2[0] = alpha2[0]; | |
1588 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1589 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
fe33eb39 LR |
1590 | |
1591 | queue_regulatory_request(request); | |
1592 | ||
1593 | return 0; | |
b2e1b302 LR |
1594 | } |
1595 | EXPORT_SYMBOL(regulatory_hint); | |
1596 | ||
3f2355cb LR |
1597 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, |
1598 | u32 country_ie_checksum) | |
1599 | { | |
806a9e39 LR |
1600 | struct wiphy *request_wiphy; |
1601 | ||
761cf7ec LR |
1602 | assert_cfg80211_lock(); |
1603 | ||
806a9e39 LR |
1604 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1605 | ||
1606 | if (!request_wiphy) | |
3f2355cb | 1607 | return false; |
806a9e39 LR |
1608 | |
1609 | if (likely(request_wiphy != wiphy)) | |
3f2355cb | 1610 | return !country_ie_integrity_changes(country_ie_checksum); |
fb1fc7ad LR |
1611 | /* |
1612 | * We should not have let these through at this point, they | |
3f2355cb | 1613 | * should have been picked up earlier by the first alpha2 check |
fb1fc7ad LR |
1614 | * on the device |
1615 | */ | |
3f2355cb LR |
1616 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) |
1617 | return true; | |
1618 | return false; | |
1619 | } | |
1620 | ||
1621 | void regulatory_hint_11d(struct wiphy *wiphy, | |
1622 | u8 *country_ie, | |
1623 | u8 country_ie_len) | |
1624 | { | |
1625 | struct ieee80211_regdomain *rd = NULL; | |
1626 | char alpha2[2]; | |
1627 | u32 checksum = 0; | |
1628 | enum environment_cap env = ENVIRON_ANY; | |
fe33eb39 | 1629 | struct regulatory_request *request; |
3f2355cb | 1630 | |
a1794390 | 1631 | mutex_lock(&cfg80211_mutex); |
3f2355cb | 1632 | |
d335fe63 LR |
1633 | if (unlikely(!last_request)) { |
1634 | mutex_unlock(&cfg80211_mutex); | |
1635 | return; | |
1636 | } | |
1637 | ||
3f2355cb LR |
1638 | /* IE len must be evenly divisible by 2 */ |
1639 | if (country_ie_len & 0x01) | |
1640 | goto out; | |
1641 | ||
1642 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1643 | goto out; | |
1644 | ||
fb1fc7ad LR |
1645 | /* |
1646 | * Pending country IE processing, this can happen after we | |
3f2355cb | 1647 | * call CRDA and wait for a response if a beacon was received before |
fb1fc7ad LR |
1648 | * we were able to process the last regulatory_hint_11d() call |
1649 | */ | |
3f2355cb LR |
1650 | if (country_ie_regdomain) |
1651 | goto out; | |
1652 | ||
1653 | alpha2[0] = country_ie[0]; | |
1654 | alpha2[1] = country_ie[1]; | |
1655 | ||
1656 | if (country_ie[2] == 'I') | |
1657 | env = ENVIRON_INDOOR; | |
1658 | else if (country_ie[2] == 'O') | |
1659 | env = ENVIRON_OUTDOOR; | |
1660 | ||
fb1fc7ad LR |
1661 | /* |
1662 | * We will run this for *every* beacon processed for the BSSID, so | |
3f2355cb | 1663 | * we optimize an early check to exit out early if we don't have to |
fb1fc7ad LR |
1664 | * do anything |
1665 | */ | |
806a9e39 | 1666 | if (likely(wiphy_idx_valid(last_request->wiphy_idx))) { |
3f2355cb LR |
1667 | struct cfg80211_registered_device *drv_last_ie; |
1668 | ||
806a9e39 LR |
1669 | drv_last_ie = |
1670 | cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx); | |
3f2355cb | 1671 | |
fb1fc7ad LR |
1672 | /* |
1673 | * Lets keep this simple -- we trust the first AP | |
1674 | * after we intersect with CRDA | |
1675 | */ | |
806a9e39 | 1676 | if (likely(&drv_last_ie->wiphy == wiphy)) { |
fb1fc7ad LR |
1677 | /* |
1678 | * Ignore IEs coming in on this wiphy with | |
1679 | * the same alpha2 and environment cap | |
1680 | */ | |
3f2355cb LR |
1681 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, |
1682 | alpha2) && | |
1683 | env == drv_last_ie->env)) { | |
1684 | goto out; | |
1685 | } | |
fb1fc7ad LR |
1686 | /* |
1687 | * the wiphy moved on to another BSSID or the AP | |
3f2355cb LR |
1688 | * was reconfigured. XXX: We need to deal with the |
1689 | * case where the user suspends and goes to goes | |
1690 | * to another country, and then gets IEs from an | |
fb1fc7ad LR |
1691 | * AP with different settings |
1692 | */ | |
3f2355cb LR |
1693 | goto out; |
1694 | } else { | |
fb1fc7ad LR |
1695 | /* |
1696 | * Ignore IEs coming in on two separate wiphys with | |
1697 | * the same alpha2 and environment cap | |
1698 | */ | |
3f2355cb LR |
1699 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, |
1700 | alpha2) && | |
1701 | env == drv_last_ie->env)) { | |
1702 | goto out; | |
1703 | } | |
1704 | /* We could potentially intersect though */ | |
1705 | goto out; | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); | |
1710 | if (!rd) | |
1711 | goto out; | |
1712 | ||
915278e0 LR |
1713 | /* |
1714 | * This will not happen right now but we leave it here for the | |
3f2355cb LR |
1715 | * the future when we want to add suspend/resume support and having |
1716 | * the user move to another country after doing so, or having the user | |
915278e0 LR |
1717 | * move to another AP. Right now we just trust the first AP. |
1718 | * | |
1719 | * If we hit this before we add this support we want to be informed of | |
1720 | * it as it would indicate a mistake in the current design | |
1721 | */ | |
1722 | if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum))) | |
0441d6ff | 1723 | goto free_rd_out; |
3f2355cb | 1724 | |
fe33eb39 LR |
1725 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1726 | if (!request) | |
1727 | goto free_rd_out; | |
1728 | ||
fb1fc7ad LR |
1729 | /* |
1730 | * We keep this around for when CRDA comes back with a response so | |
1731 | * we can intersect with that | |
1732 | */ | |
3f2355cb LR |
1733 | country_ie_regdomain = rd; |
1734 | ||
fe33eb39 LR |
1735 | request->wiphy_idx = get_wiphy_idx(wiphy); |
1736 | request->alpha2[0] = rd->alpha2[0]; | |
1737 | request->alpha2[1] = rd->alpha2[1]; | |
7db90f4a | 1738 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
fe33eb39 LR |
1739 | request->country_ie_checksum = checksum; |
1740 | request->country_ie_env = env; | |
1741 | ||
1742 | mutex_unlock(&cfg80211_mutex); | |
3f2355cb | 1743 | |
fe33eb39 LR |
1744 | queue_regulatory_request(request); |
1745 | ||
1746 | return; | |
0441d6ff LR |
1747 | |
1748 | free_rd_out: | |
1749 | kfree(rd); | |
3f2355cb | 1750 | out: |
a1794390 | 1751 | mutex_unlock(&cfg80211_mutex); |
3f2355cb LR |
1752 | } |
1753 | EXPORT_SYMBOL(regulatory_hint_11d); | |
b2e1b302 | 1754 | |
e38f8a7a LR |
1755 | static bool freq_is_chan_12_13_14(u16 freq) |
1756 | { | |
1757 | if (freq == ieee80211_channel_to_frequency(12) || | |
1758 | freq == ieee80211_channel_to_frequency(13) || | |
1759 | freq == ieee80211_channel_to_frequency(14)) | |
1760 | return true; | |
1761 | return false; | |
1762 | } | |
1763 | ||
1764 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
1765 | struct ieee80211_channel *beacon_chan, | |
1766 | gfp_t gfp) | |
1767 | { | |
1768 | struct reg_beacon *reg_beacon; | |
1769 | ||
1770 | if (likely((beacon_chan->beacon_found || | |
1771 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || | |
1772 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
1773 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) | |
1774 | return 0; | |
1775 | ||
1776 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
1777 | if (!reg_beacon) | |
1778 | return -ENOMEM; | |
1779 | ||
1780 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1781 | printk(KERN_DEBUG "cfg80211: Found new beacon on " | |
1782 | "frequency: %d MHz (Ch %d) on %s\n", | |
1783 | beacon_chan->center_freq, | |
1784 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
1785 | wiphy_name(wiphy)); | |
1786 | #endif | |
1787 | memcpy(®_beacon->chan, beacon_chan, | |
1788 | sizeof(struct ieee80211_channel)); | |
1789 | ||
1790 | ||
1791 | /* | |
1792 | * Since we can be called from BH or and non-BH context | |
1793 | * we must use spin_lock_bh() | |
1794 | */ | |
1795 | spin_lock_bh(®_pending_beacons_lock); | |
1796 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
1797 | spin_unlock_bh(®_pending_beacons_lock); | |
1798 | ||
1799 | schedule_work(®_work); | |
1800 | ||
1801 | return 0; | |
1802 | } | |
1803 | ||
a3d2eaf0 | 1804 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1805 | { |
1806 | unsigned int i; | |
a3d2eaf0 JB |
1807 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1808 | const struct ieee80211_freq_range *freq_range = NULL; | |
1809 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
1810 | |
1811 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
1812 | "(max_antenna_gain, max_eirp)\n"); | |
1813 | ||
1814 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1815 | reg_rule = &rd->reg_rules[i]; | |
1816 | freq_range = ®_rule->freq_range; | |
1817 | power_rule = ®_rule->power_rule; | |
1818 | ||
fb1fc7ad LR |
1819 | /* |
1820 | * There may not be documentation for max antenna gain | |
1821 | * in certain regions | |
1822 | */ | |
b2e1b302 LR |
1823 | if (power_rule->max_antenna_gain) |
1824 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1825 | "(%d mBi, %d mBm)\n", | |
1826 | freq_range->start_freq_khz, | |
1827 | freq_range->end_freq_khz, | |
1828 | freq_range->max_bandwidth_khz, | |
1829 | power_rule->max_antenna_gain, | |
1830 | power_rule->max_eirp); | |
1831 | else | |
1832 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1833 | "(N/A, %d mBm)\n", | |
1834 | freq_range->start_freq_khz, | |
1835 | freq_range->end_freq_khz, | |
1836 | freq_range->max_bandwidth_khz, | |
1837 | power_rule->max_eirp); | |
1838 | } | |
1839 | } | |
1840 | ||
a3d2eaf0 | 1841 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1842 | { |
1843 | ||
3f2355cb | 1844 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 1845 | |
7db90f4a LR |
1846 | if (last_request->initiator == |
1847 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 LR |
1848 | struct cfg80211_registered_device *drv; |
1849 | drv = cfg80211_drv_by_wiphy_idx( | |
1850 | last_request->wiphy_idx); | |
1851 | if (drv) { | |
3f2355cb LR |
1852 | printk(KERN_INFO "cfg80211: Current regulatory " |
1853 | "domain updated by AP to: %c%c\n", | |
1854 | drv->country_ie_alpha2[0], | |
1855 | drv->country_ie_alpha2[1]); | |
1856 | } else | |
1857 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1858 | "domain intersected: \n"); | |
1859 | } else | |
1860 | printk(KERN_INFO "cfg80211: Current regulatory " | |
039498c6 | 1861 | "domain intersected: \n"); |
3f2355cb | 1862 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
1863 | printk(KERN_INFO "cfg80211: World regulatory " |
1864 | "domain updated:\n"); | |
1865 | else { | |
1866 | if (is_unknown_alpha2(rd->alpha2)) | |
1867 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1868 | "changed to driver built-in settings " | |
1869 | "(unknown country)\n"); | |
1870 | else | |
1871 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1872 | "changed to country: %c%c\n", | |
1873 | rd->alpha2[0], rd->alpha2[1]); | |
1874 | } | |
1875 | print_rd_rules(rd); | |
1876 | } | |
1877 | ||
2df78167 | 1878 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1879 | { |
1880 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1881 | rd->alpha2[0], rd->alpha2[1]); | |
1882 | print_rd_rules(rd); | |
1883 | } | |
1884 | ||
3f2355cb LR |
1885 | #ifdef CONFIG_CFG80211_REG_DEBUG |
1886 | static void reg_country_ie_process_debug( | |
1887 | const struct ieee80211_regdomain *rd, | |
1888 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1889 | const struct ieee80211_regdomain *intersected_rd) | |
1890 | { | |
1891 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
1892 | print_regdomain_info(country_ie_regdomain); | |
1893 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
1894 | print_regdomain_info(rd); | |
1895 | if (intersected_rd) { | |
1896 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
1897 | "and get:\n"); | |
667ecd01 | 1898 | print_regdomain_info(intersected_rd); |
3f2355cb LR |
1899 | return; |
1900 | } | |
1901 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
1902 | } | |
1903 | #else | |
1904 | static inline void reg_country_ie_process_debug( | |
1905 | const struct ieee80211_regdomain *rd, | |
1906 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1907 | const struct ieee80211_regdomain *intersected_rd) | |
1908 | { | |
1909 | } | |
1910 | #endif | |
1911 | ||
d2372b31 | 1912 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1913 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1914 | { |
9c96477d | 1915 | const struct ieee80211_regdomain *intersected_rd = NULL; |
3f2355cb | 1916 | struct cfg80211_registered_device *drv = NULL; |
806a9e39 | 1917 | struct wiphy *request_wiphy; |
b2e1b302 LR |
1918 | /* Some basic sanity checks first */ |
1919 | ||
b2e1b302 | 1920 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1921 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1922 | return -EINVAL; |
1923 | update_world_regdomain(rd); | |
1924 | return 0; | |
1925 | } | |
b2e1b302 LR |
1926 | |
1927 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1928 | !is_unknown_alpha2(rd->alpha2)) | |
1929 | return -EINVAL; | |
1930 | ||
f6037d09 | 1931 | if (!last_request) |
b2e1b302 LR |
1932 | return -EINVAL; |
1933 | ||
fb1fc7ad LR |
1934 | /* |
1935 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 1936 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
1937 | * and the pending request came in from a country IE |
1938 | */ | |
7db90f4a | 1939 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
1940 | /* |
1941 | * If someone else asked us to change the rd lets only bother | |
1942 | * checking if the alpha2 changes if CRDA was already called | |
1943 | */ | |
3f2355cb | 1944 | if (!is_old_static_regdom(cfg80211_regdomain) && |
69b1572b | 1945 | !regdom_changes(rd->alpha2)) |
3f2355cb LR |
1946 | return -EINVAL; |
1947 | } | |
1948 | ||
fb1fc7ad LR |
1949 | /* |
1950 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
1951 | * and finally inform them of what we have done, in case they want |
1952 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
1953 | * internal EEPROM data |
1954 | */ | |
b2e1b302 | 1955 | |
f6037d09 | 1956 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1957 | return -EINVAL; |
1958 | ||
8375af3b LR |
1959 | if (!is_valid_rd(rd)) { |
1960 | printk(KERN_ERR "cfg80211: Invalid " | |
1961 | "regulatory domain detected:\n"); | |
1962 | print_regdomain_info(rd); | |
1963 | return -EINVAL; | |
b2e1b302 LR |
1964 | } |
1965 | ||
806a9e39 LR |
1966 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1967 | ||
b8295acd | 1968 | if (!last_request->intersect) { |
3e0c3ff3 LR |
1969 | int r; |
1970 | ||
7db90f4a | 1971 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
3e0c3ff3 LR |
1972 | reset_regdomains(); |
1973 | cfg80211_regdomain = rd; | |
1974 | return 0; | |
1975 | } | |
1976 | ||
fb1fc7ad LR |
1977 | /* |
1978 | * For a driver hint, lets copy the regulatory domain the | |
1979 | * driver wanted to the wiphy to deal with conflicts | |
1980 | */ | |
3e0c3ff3 | 1981 | |
806a9e39 | 1982 | BUG_ON(request_wiphy->regd); |
3e0c3ff3 | 1983 | |
806a9e39 | 1984 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
1985 | if (r) |
1986 | return r; | |
1987 | ||
b8295acd LR |
1988 | reset_regdomains(); |
1989 | cfg80211_regdomain = rd; | |
1990 | return 0; | |
1991 | } | |
1992 | ||
1993 | /* Intersection requires a bit more work */ | |
1994 | ||
7db90f4a | 1995 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 1996 | |
9c96477d LR |
1997 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
1998 | if (!intersected_rd) | |
1999 | return -EINVAL; | |
b8295acd | 2000 | |
fb1fc7ad LR |
2001 | /* |
2002 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 2003 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
2004 | * domain we keep it for its private use |
2005 | */ | |
7db90f4a | 2006 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 2007 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
2008 | else |
2009 | kfree(rd); | |
2010 | ||
b8295acd LR |
2011 | rd = NULL; |
2012 | ||
2013 | reset_regdomains(); | |
2014 | cfg80211_regdomain = intersected_rd; | |
2015 | ||
2016 | return 0; | |
9c96477d LR |
2017 | } |
2018 | ||
3f2355cb LR |
2019 | /* |
2020 | * Country IE requests are handled a bit differently, we intersect | |
2021 | * the country IE rd with what CRDA believes that country should have | |
2022 | */ | |
2023 | ||
2024 | BUG_ON(!country_ie_regdomain); | |
2025 | ||
2026 | if (rd != country_ie_regdomain) { | |
fb1fc7ad LR |
2027 | /* |
2028 | * Intersect what CRDA returned and our what we | |
2029 | * had built from the Country IE received | |
2030 | */ | |
3f2355cb LR |
2031 | |
2032 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); | |
2033 | ||
2034 | reg_country_ie_process_debug(rd, country_ie_regdomain, | |
2035 | intersected_rd); | |
2036 | ||
2037 | kfree(country_ie_regdomain); | |
2038 | country_ie_regdomain = NULL; | |
2039 | } else { | |
fb1fc7ad LR |
2040 | /* |
2041 | * This would happen when CRDA was not present and | |
3f2355cb | 2042 | * OLD_REGULATORY was enabled. We intersect our Country |
fb1fc7ad LR |
2043 | * IE rd and what was set on cfg80211 originally |
2044 | */ | |
3f2355cb LR |
2045 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
2046 | } | |
2047 | ||
2048 | if (!intersected_rd) | |
2049 | return -EINVAL; | |
2050 | ||
806a9e39 | 2051 | drv = wiphy_to_dev(request_wiphy); |
3f2355cb LR |
2052 | |
2053 | drv->country_ie_alpha2[0] = rd->alpha2[0]; | |
2054 | drv->country_ie_alpha2[1] = rd->alpha2[1]; | |
2055 | drv->env = last_request->country_ie_env; | |
2056 | ||
2057 | BUG_ON(intersected_rd == rd); | |
2058 | ||
2059 | kfree(rd); | |
2060 | rd = NULL; | |
2061 | ||
b8295acd | 2062 | reset_regdomains(); |
3f2355cb | 2063 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2064 | |
2065 | return 0; | |
2066 | } | |
2067 | ||
2068 | ||
fb1fc7ad LR |
2069 | /* |
2070 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2071 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2072 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2073 | */ | |
a3d2eaf0 | 2074 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2075 | { |
b2e1b302 LR |
2076 | int r; |
2077 | ||
761cf7ec LR |
2078 | assert_cfg80211_lock(); |
2079 | ||
b2e1b302 LR |
2080 | /* Note that this doesn't update the wiphys, this is done below */ |
2081 | r = __set_regdom(rd); | |
d2372b31 JB |
2082 | if (r) { |
2083 | kfree(rd); | |
b2e1b302 | 2084 | return r; |
d2372b31 | 2085 | } |
b2e1b302 | 2086 | |
b2e1b302 | 2087 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2088 | if (!last_request->intersect) |
2089 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2090 | |
2091 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2092 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2093 | |
a01ddafd | 2094 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2095 | |
73d54c9e LR |
2096 | nl80211_send_reg_change_event(last_request); |
2097 | ||
b2e1b302 LR |
2098 | return r; |
2099 | } | |
2100 | ||
a1794390 | 2101 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2102 | void reg_device_remove(struct wiphy *wiphy) |
2103 | { | |
806a9e39 LR |
2104 | struct wiphy *request_wiphy; |
2105 | ||
761cf7ec LR |
2106 | assert_cfg80211_lock(); |
2107 | ||
806a9e39 LR |
2108 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
2109 | ||
3e0c3ff3 | 2110 | kfree(wiphy->regd); |
806a9e39 | 2111 | if (!last_request || !request_wiphy) |
3f2355cb | 2112 | return; |
806a9e39 | 2113 | if (request_wiphy != wiphy) |
3f2355cb | 2114 | return; |
806a9e39 | 2115 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb LR |
2116 | last_request->country_ie_env = ENVIRON_ANY; |
2117 | } | |
2118 | ||
b2e1b302 LR |
2119 | int regulatory_init(void) |
2120 | { | |
bcf4f99b | 2121 | int err = 0; |
734366de | 2122 | |
b2e1b302 LR |
2123 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2124 | if (IS_ERR(reg_pdev)) | |
2125 | return PTR_ERR(reg_pdev); | |
734366de | 2126 | |
fe33eb39 | 2127 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2128 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2129 | |
734366de | 2130 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY |
a3d2eaf0 | 2131 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 2132 | |
942b25cf | 2133 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de | 2134 | print_regdomain_info(cfg80211_regdomain); |
fb1fc7ad LR |
2135 | /* |
2136 | * The old code still requests for a new regdomain and if | |
734366de JB |
2137 | * you have CRDA you get it updated, otherwise you get |
2138 | * stuck with the static values. We ignore "EU" code as | |
fb1fc7ad LR |
2139 | * that is not a valid ISO / IEC 3166 alpha2 |
2140 | */ | |
ac9440a4 | 2141 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') |
ba25c141 | 2142 | err = regulatory_hint_core(ieee80211_regdom); |
734366de | 2143 | #else |
a3d2eaf0 | 2144 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2145 | |
ba25c141 | 2146 | err = regulatory_hint_core("00"); |
bcf4f99b | 2147 | #endif |
ba25c141 | 2148 | if (err) { |
bcf4f99b LR |
2149 | if (err == -ENOMEM) |
2150 | return err; | |
2151 | /* | |
2152 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2153 | * memory which is handled and propagated appropriately above | |
2154 | * but it can also fail during a netlink_broadcast() or during | |
2155 | * early boot for call_usermodehelper(). For now treat these | |
2156 | * errors as non-fatal. | |
2157 | */ | |
2158 | printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " | |
2159 | "to call CRDA during init"); | |
2160 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
2161 | /* We want to find out exactly why when debugging */ | |
2162 | WARN_ON(err); | |
734366de | 2163 | #endif |
bcf4f99b | 2164 | } |
734366de | 2165 | |
b2e1b302 LR |
2166 | return 0; |
2167 | } | |
2168 | ||
2169 | void regulatory_exit(void) | |
2170 | { | |
fe33eb39 | 2171 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2172 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2173 | |
2174 | cancel_work_sync(®_work); | |
2175 | ||
a1794390 | 2176 | mutex_lock(&cfg80211_mutex); |
734366de | 2177 | |
b2e1b302 | 2178 | reset_regdomains(); |
734366de | 2179 | |
3f2355cb LR |
2180 | kfree(country_ie_regdomain); |
2181 | country_ie_regdomain = NULL; | |
2182 | ||
f6037d09 JB |
2183 | kfree(last_request); |
2184 | ||
b2e1b302 | 2185 | platform_device_unregister(reg_pdev); |
734366de | 2186 | |
e38f8a7a LR |
2187 | spin_lock_bh(®_pending_beacons_lock); |
2188 | if (!list_empty(®_pending_beacons)) { | |
2189 | list_for_each_entry_safe(reg_beacon, btmp, | |
2190 | ®_pending_beacons, list) { | |
2191 | list_del(®_beacon->list); | |
2192 | kfree(reg_beacon); | |
2193 | } | |
2194 | } | |
2195 | spin_unlock_bh(®_pending_beacons_lock); | |
2196 | ||
2197 | if (!list_empty(®_beacon_list)) { | |
2198 | list_for_each_entry_safe(reg_beacon, btmp, | |
2199 | ®_beacon_list, list) { | |
2200 | list_del(®_beacon->list); | |
2201 | kfree(reg_beacon); | |
2202 | } | |
2203 | } | |
2204 | ||
fe33eb39 LR |
2205 | spin_lock(®_requests_lock); |
2206 | if (!list_empty(®_requests_list)) { | |
2207 | list_for_each_entry_safe(reg_request, tmp, | |
2208 | ®_requests_list, list) { | |
2209 | list_del(®_request->list); | |
2210 | kfree(reg_request); | |
2211 | } | |
2212 | } | |
2213 | spin_unlock(®_requests_lock); | |
2214 | ||
a1794390 | 2215 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2216 | } |