Commit | Line | Data |
---|---|---|
8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
3b77d5ec | 5 | * Copyright 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com> |
8318d78a | 6 | * |
3b77d5ec LR |
7 | * Permission to use, copy, modify, and/or distribute this software for any |
8 | * purpose with or without fee is hereby granted, provided that the above | |
9 | * copyright notice and this permission notice appear in all copies. | |
10 | * | |
11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
17 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
8318d78a JB |
18 | */ |
19 | ||
3b77d5ec | 20 | |
b2e1b302 LR |
21 | /** |
22 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
23 | * |
24 | * The usual implementation is for a driver to read a device EEPROM to | |
25 | * determine which regulatory domain it should be operating under, then | |
26 | * looking up the allowable channels in a driver-local table and finally | |
27 | * registering those channels in the wiphy structure. | |
28 | * | |
b2e1b302 LR |
29 | * Another set of compliance enforcement is for drivers to use their |
30 | * own compliance limits which can be stored on the EEPROM. The host | |
31 | * driver or firmware may ensure these are used. | |
32 | * | |
33 | * In addition to all this we provide an extra layer of regulatory | |
34 | * conformance. For drivers which do not have any regulatory | |
35 | * information CRDA provides the complete regulatory solution. | |
36 | * For others it provides a community effort on further restrictions | |
37 | * to enhance compliance. | |
38 | * | |
39 | * Note: When number of rules --> infinity we will not be able to | |
40 | * index on alpha2 any more, instead we'll probably have to | |
41 | * rely on some SHA1 checksum of the regdomain for example. | |
42 | * | |
8318d78a | 43 | */ |
e9c0268f JP |
44 | |
45 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
46 | ||
8318d78a | 47 | #include <linux/kernel.h> |
bc3b2d7f | 48 | #include <linux/export.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
b2e1b302 LR |
50 | #include <linux/list.h> |
51 | #include <linux/random.h> | |
c61029c7 | 52 | #include <linux/ctype.h> |
b2e1b302 LR |
53 | #include <linux/nl80211.h> |
54 | #include <linux/platform_device.h> | |
d9b93842 | 55 | #include <linux/moduleparam.h> |
b2e1b302 | 56 | #include <net/cfg80211.h> |
8318d78a | 57 | #include "core.h" |
b2e1b302 | 58 | #include "reg.h" |
3b377ea9 | 59 | #include "regdb.h" |
73d54c9e | 60 | #include "nl80211.h" |
8318d78a | 61 | |
4113f751 | 62 | #ifdef CONFIG_CFG80211_REG_DEBUG |
12c5ffb5 JP |
63 | #define REG_DBG_PRINT(format, args...) \ |
64 | printk(KERN_DEBUG pr_fmt(format), ##args) | |
4113f751 | 65 | #else |
8271195e | 66 | #define REG_DBG_PRINT(args...) |
4113f751 LR |
67 | #endif |
68 | ||
a042994d LR |
69 | static struct regulatory_request core_request_world = { |
70 | .initiator = NL80211_REGDOM_SET_BY_CORE, | |
71 | .alpha2[0] = '0', | |
72 | .alpha2[1] = '0', | |
73 | .intersect = false, | |
74 | .processed = true, | |
75 | .country_ie_env = ENVIRON_ANY, | |
76 | }; | |
77 | ||
5166ccd2 | 78 | /* Receipt of information from last regulatory request */ |
a042994d | 79 | static struct regulatory_request *last_request = &core_request_world; |
734366de | 80 | |
b2e1b302 LR |
81 | /* To trigger userspace events */ |
82 | static struct platform_device *reg_pdev; | |
8318d78a | 83 | |
4d9d88d1 SJR |
84 | static struct device_type reg_device_type = { |
85 | .uevent = reg_device_uevent, | |
86 | }; | |
87 | ||
fb1fc7ad LR |
88 | /* |
89 | * Central wireless core regulatory domains, we only need two, | |
734366de | 90 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
91 | * information to give us an alpha2 |
92 | */ | |
f130347c | 93 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 94 | |
abc7381b LR |
95 | /* |
96 | * Protects static reg.c components: | |
97 | * - cfg80211_world_regdom | |
98 | * - cfg80211_regdom | |
abc7381b LR |
99 | * - last_request |
100 | */ | |
670b7f11 | 101 | static DEFINE_MUTEX(reg_mutex); |
46a5ebaf JB |
102 | |
103 | static inline void assert_reg_lock(void) | |
104 | { | |
105 | lockdep_assert_held(®_mutex); | |
106 | } | |
abc7381b | 107 | |
e38f8a7a | 108 | /* Used to queue up regulatory hints */ |
fe33eb39 LR |
109 | static LIST_HEAD(reg_requests_list); |
110 | static spinlock_t reg_requests_lock; | |
111 | ||
e38f8a7a LR |
112 | /* Used to queue up beacon hints for review */ |
113 | static LIST_HEAD(reg_pending_beacons); | |
114 | static spinlock_t reg_pending_beacons_lock; | |
115 | ||
116 | /* Used to keep track of processed beacon hints */ | |
117 | static LIST_HEAD(reg_beacon_list); | |
118 | ||
119 | struct reg_beacon { | |
120 | struct list_head list; | |
121 | struct ieee80211_channel chan; | |
122 | }; | |
123 | ||
f333a7a2 LR |
124 | static void reg_todo(struct work_struct *work); |
125 | static DECLARE_WORK(reg_work, reg_todo); | |
126 | ||
a90c7a31 LR |
127 | static void reg_timeout_work(struct work_struct *work); |
128 | static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work); | |
129 | ||
734366de JB |
130 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
131 | static const struct ieee80211_regdomain world_regdom = { | |
611b6a82 | 132 | .n_reg_rules = 5, |
734366de JB |
133 | .alpha2 = "00", |
134 | .reg_rules = { | |
68798a62 LR |
135 | /* IEEE 802.11b/g, channels 1..11 */ |
136 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
611b6a82 LR |
137 | /* IEEE 802.11b/g, channels 12..13. No HT40 |
138 | * channel fits here. */ | |
139 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
3fc71f77 LR |
140 | NL80211_RRF_PASSIVE_SCAN | |
141 | NL80211_RRF_NO_IBSS), | |
611b6a82 LR |
142 | /* IEEE 802.11 channel 14 - Only JP enables |
143 | * this and for 802.11b only */ | |
144 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
145 | NL80211_RRF_PASSIVE_SCAN | | |
146 | NL80211_RRF_NO_IBSS | | |
147 | NL80211_RRF_NO_OFDM), | |
148 | /* IEEE 802.11a, channel 36..48 */ | |
ec329ace | 149 | REG_RULE(5180-10, 5240+10, 40, 6, 20, |
611b6a82 LR |
150 | NL80211_RRF_PASSIVE_SCAN | |
151 | NL80211_RRF_NO_IBSS), | |
3fc71f77 LR |
152 | |
153 | /* NB: 5260 MHz - 5700 MHz requies DFS */ | |
154 | ||
155 | /* IEEE 802.11a, channel 149..165 */ | |
ec329ace | 156 | REG_RULE(5745-10, 5825+10, 40, 6, 20, |
3fc71f77 LR |
157 | NL80211_RRF_PASSIVE_SCAN | |
158 | NL80211_RRF_NO_IBSS), | |
734366de JB |
159 | } |
160 | }; | |
161 | ||
a3d2eaf0 JB |
162 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
163 | &world_regdom; | |
734366de | 164 | |
6ee7d330 | 165 | static char *ieee80211_regdom = "00"; |
09d989d1 | 166 | static char user_alpha2[2]; |
6ee7d330 | 167 | |
734366de JB |
168 | module_param(ieee80211_regdom, charp, 0444); |
169 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
170 | ||
a042994d | 171 | static void reset_regdomains(bool full_reset) |
734366de | 172 | { |
942b25cf JB |
173 | /* avoid freeing static information or freeing something twice */ |
174 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
175 | cfg80211_regdomain = NULL; | |
176 | if (cfg80211_world_regdom == &world_regdom) | |
177 | cfg80211_world_regdom = NULL; | |
178 | if (cfg80211_regdomain == &world_regdom) | |
179 | cfg80211_regdomain = NULL; | |
942b25cf JB |
180 | |
181 | kfree(cfg80211_regdomain); | |
182 | kfree(cfg80211_world_regdom); | |
734366de | 183 | |
a3d2eaf0 | 184 | cfg80211_world_regdom = &world_regdom; |
734366de | 185 | cfg80211_regdomain = NULL; |
a042994d LR |
186 | |
187 | if (!full_reset) | |
188 | return; | |
189 | ||
190 | if (last_request != &core_request_world) | |
191 | kfree(last_request); | |
192 | last_request = &core_request_world; | |
734366de JB |
193 | } |
194 | ||
fb1fc7ad LR |
195 | /* |
196 | * Dynamic world regulatory domain requested by the wireless | |
197 | * core upon initialization | |
198 | */ | |
a3d2eaf0 | 199 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 200 | { |
f6037d09 | 201 | BUG_ON(!last_request); |
734366de | 202 | |
a042994d | 203 | reset_regdomains(false); |
734366de JB |
204 | |
205 | cfg80211_world_regdom = rd; | |
206 | cfg80211_regdomain = rd; | |
207 | } | |
734366de | 208 | |
a3d2eaf0 | 209 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
210 | { |
211 | if (!alpha2) | |
212 | return false; | |
213 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
214 | return true; | |
215 | return false; | |
216 | } | |
8318d78a | 217 | |
a3d2eaf0 | 218 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
219 | { |
220 | if (!alpha2) | |
221 | return false; | |
222 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
223 | return true; | |
224 | return false; | |
225 | } | |
8318d78a | 226 | |
a3d2eaf0 | 227 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
228 | { |
229 | if (!alpha2) | |
230 | return false; | |
fb1fc7ad LR |
231 | /* |
232 | * Special case where regulatory domain was built by driver | |
233 | * but a specific alpha2 cannot be determined | |
234 | */ | |
b2e1b302 LR |
235 | if (alpha2[0] == '9' && alpha2[1] == '9') |
236 | return true; | |
237 | return false; | |
238 | } | |
8318d78a | 239 | |
3f2355cb LR |
240 | static bool is_intersected_alpha2(const char *alpha2) |
241 | { | |
242 | if (!alpha2) | |
243 | return false; | |
fb1fc7ad LR |
244 | /* |
245 | * Special case where regulatory domain is the | |
3f2355cb | 246 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
247 | * structures |
248 | */ | |
3f2355cb LR |
249 | if (alpha2[0] == '9' && alpha2[1] == '8') |
250 | return true; | |
251 | return false; | |
252 | } | |
253 | ||
a3d2eaf0 | 254 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
255 | { |
256 | if (!alpha2) | |
257 | return false; | |
c61029c7 | 258 | if (isalpha(alpha2[0]) && isalpha(alpha2[1])) |
b2e1b302 LR |
259 | return true; |
260 | return false; | |
261 | } | |
8318d78a | 262 | |
a3d2eaf0 | 263 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
264 | { |
265 | if (!alpha2_x || !alpha2_y) | |
266 | return false; | |
267 | if (alpha2_x[0] == alpha2_y[0] && | |
268 | alpha2_x[1] == alpha2_y[1]) | |
269 | return true; | |
270 | return false; | |
271 | } | |
272 | ||
69b1572b | 273 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 274 | { |
761cf7ec LR |
275 | assert_cfg80211_lock(); |
276 | ||
b2e1b302 LR |
277 | if (!cfg80211_regdomain) |
278 | return true; | |
279 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
280 | return false; | |
281 | return true; | |
282 | } | |
283 | ||
09d989d1 LR |
284 | /* |
285 | * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets | |
286 | * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER | |
287 | * has ever been issued. | |
288 | */ | |
289 | static bool is_user_regdom_saved(void) | |
290 | { | |
291 | if (user_alpha2[0] == '9' && user_alpha2[1] == '7') | |
292 | return false; | |
293 | ||
294 | /* This would indicate a mistake on the design */ | |
295 | if (WARN((!is_world_regdom(user_alpha2) && | |
296 | !is_an_alpha2(user_alpha2)), | |
297 | "Unexpected user alpha2: %c%c\n", | |
298 | user_alpha2[0], | |
299 | user_alpha2[1])) | |
300 | return false; | |
301 | ||
302 | return true; | |
303 | } | |
304 | ||
3b377ea9 JL |
305 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
306 | const struct ieee80211_regdomain *src_regd) | |
307 | { | |
308 | struct ieee80211_regdomain *regd; | |
309 | int size_of_regd = 0; | |
310 | unsigned int i; | |
311 | ||
312 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
313 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
314 | ||
315 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
316 | if (!regd) | |
317 | return -ENOMEM; | |
318 | ||
319 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
320 | ||
321 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
322 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
323 | sizeof(struct ieee80211_reg_rule)); | |
324 | ||
325 | *dst_regd = regd; | |
326 | return 0; | |
327 | } | |
328 | ||
329 | #ifdef CONFIG_CFG80211_INTERNAL_REGDB | |
330 | struct reg_regdb_search_request { | |
331 | char alpha2[2]; | |
332 | struct list_head list; | |
333 | }; | |
334 | ||
335 | static LIST_HEAD(reg_regdb_search_list); | |
368d06f5 | 336 | static DEFINE_MUTEX(reg_regdb_search_mutex); |
3b377ea9 JL |
337 | |
338 | static void reg_regdb_search(struct work_struct *work) | |
339 | { | |
340 | struct reg_regdb_search_request *request; | |
341 | const struct ieee80211_regdomain *curdom, *regdom; | |
342 | int i, r; | |
343 | ||
368d06f5 | 344 | mutex_lock(®_regdb_search_mutex); |
3b377ea9 JL |
345 | while (!list_empty(®_regdb_search_list)) { |
346 | request = list_first_entry(®_regdb_search_list, | |
347 | struct reg_regdb_search_request, | |
348 | list); | |
349 | list_del(&request->list); | |
350 | ||
351 | for (i=0; i<reg_regdb_size; i++) { | |
352 | curdom = reg_regdb[i]; | |
353 | ||
354 | if (!memcmp(request->alpha2, curdom->alpha2, 2)) { | |
355 | r = reg_copy_regd(®dom, curdom); | |
356 | if (r) | |
357 | break; | |
3b377ea9 JL |
358 | mutex_lock(&cfg80211_mutex); |
359 | set_regdom(regdom); | |
360 | mutex_unlock(&cfg80211_mutex); | |
3b377ea9 JL |
361 | break; |
362 | } | |
363 | } | |
364 | ||
365 | kfree(request); | |
366 | } | |
368d06f5 | 367 | mutex_unlock(®_regdb_search_mutex); |
3b377ea9 JL |
368 | } |
369 | ||
370 | static DECLARE_WORK(reg_regdb_work, reg_regdb_search); | |
371 | ||
372 | static void reg_regdb_query(const char *alpha2) | |
373 | { | |
374 | struct reg_regdb_search_request *request; | |
375 | ||
376 | if (!alpha2) | |
377 | return; | |
378 | ||
379 | request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL); | |
380 | if (!request) | |
381 | return; | |
382 | ||
383 | memcpy(request->alpha2, alpha2, 2); | |
384 | ||
368d06f5 | 385 | mutex_lock(®_regdb_search_mutex); |
3b377ea9 | 386 | list_add_tail(&request->list, ®_regdb_search_list); |
368d06f5 | 387 | mutex_unlock(®_regdb_search_mutex); |
3b377ea9 JL |
388 | |
389 | schedule_work(®_regdb_work); | |
390 | } | |
391 | #else | |
392 | static inline void reg_regdb_query(const char *alpha2) {} | |
393 | #endif /* CONFIG_CFG80211_INTERNAL_REGDB */ | |
394 | ||
fb1fc7ad LR |
395 | /* |
396 | * This lets us keep regulatory code which is updated on a regulatory | |
4d9d88d1 SJR |
397 | * basis in userspace. Country information is filled in by |
398 | * reg_device_uevent | |
fb1fc7ad | 399 | */ |
b2e1b302 LR |
400 | static int call_crda(const char *alpha2) |
401 | { | |
b2e1b302 | 402 | if (!is_world_regdom((char *) alpha2)) |
e9c0268f | 403 | pr_info("Calling CRDA for country: %c%c\n", |
b2e1b302 LR |
404 | alpha2[0], alpha2[1]); |
405 | else | |
e9c0268f | 406 | pr_info("Calling CRDA to update world regulatory domain\n"); |
b2e1b302 | 407 | |
3b377ea9 JL |
408 | /* query internal regulatory database (if it exists) */ |
409 | reg_regdb_query(alpha2); | |
410 | ||
4d9d88d1 | 411 | return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE); |
b2e1b302 LR |
412 | } |
413 | ||
b2e1b302 | 414 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 415 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 416 | { |
61405e97 LR |
417 | assert_cfg80211_lock(); |
418 | ||
f6037d09 JB |
419 | if (!last_request) |
420 | return false; | |
421 | ||
422 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 423 | } |
8318d78a | 424 | |
b2e1b302 | 425 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 426 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 427 | { |
a3d2eaf0 | 428 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
429 | u32 freq_diff; |
430 | ||
91e99004 | 431 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
432 | return false; |
433 | ||
434 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
435 | return false; | |
436 | ||
437 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
438 | ||
bd05f28e RK |
439 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || |
440 | freq_range->max_bandwidth_khz > freq_diff) | |
b2e1b302 LR |
441 | return false; |
442 | ||
443 | return true; | |
444 | } | |
445 | ||
a3d2eaf0 | 446 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 447 | { |
a3d2eaf0 | 448 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 449 | unsigned int i; |
8318d78a | 450 | |
b2e1b302 LR |
451 | if (!rd->n_reg_rules) |
452 | return false; | |
8318d78a | 453 | |
88dc1c3f LR |
454 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
455 | return false; | |
456 | ||
b2e1b302 LR |
457 | for (i = 0; i < rd->n_reg_rules; i++) { |
458 | reg_rule = &rd->reg_rules[i]; | |
459 | if (!is_valid_reg_rule(reg_rule)) | |
460 | return false; | |
461 | } | |
462 | ||
463 | return true; | |
8318d78a JB |
464 | } |
465 | ||
038659e7 LR |
466 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, |
467 | u32 center_freq_khz, | |
468 | u32 bw_khz) | |
b2e1b302 | 469 | { |
038659e7 LR |
470 | u32 start_freq_khz, end_freq_khz; |
471 | ||
472 | start_freq_khz = center_freq_khz - (bw_khz/2); | |
473 | end_freq_khz = center_freq_khz + (bw_khz/2); | |
474 | ||
475 | if (start_freq_khz >= freq_range->start_freq_khz && | |
476 | end_freq_khz <= freq_range->end_freq_khz) | |
477 | return true; | |
478 | ||
479 | return false; | |
b2e1b302 | 480 | } |
8318d78a | 481 | |
0c7dc45d LR |
482 | /** |
483 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
484 | * @freq_range: frequency rule we want to query | |
485 | * @freq_khz: frequency we are inquiring about | |
486 | * | |
487 | * This lets us know if a specific frequency rule is or is not relevant to | |
488 | * a specific frequency's band. Bands are device specific and artificial | |
489 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
490 | * safe for now to assume that a frequency rule should not be part of a | |
491 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
492 | * This resolution can be lowered and should be considered as we add | |
493 | * regulatory rule support for other "bands". | |
494 | **/ | |
495 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
496 | u32 freq_khz) | |
497 | { | |
498 | #define ONE_GHZ_IN_KHZ 1000000 | |
499 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
500 | return true; | |
501 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
502 | return true; | |
503 | return false; | |
504 | #undef ONE_GHZ_IN_KHZ | |
505 | } | |
506 | ||
fb1fc7ad LR |
507 | /* |
508 | * Helper for regdom_intersect(), this does the real | |
509 | * mathematical intersection fun | |
510 | */ | |
9c96477d LR |
511 | static int reg_rules_intersect( |
512 | const struct ieee80211_reg_rule *rule1, | |
513 | const struct ieee80211_reg_rule *rule2, | |
514 | struct ieee80211_reg_rule *intersected_rule) | |
515 | { | |
516 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
517 | struct ieee80211_freq_range *freq_range; | |
518 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
519 | struct ieee80211_power_rule *power_rule; | |
520 | u32 freq_diff; | |
521 | ||
522 | freq_range1 = &rule1->freq_range; | |
523 | freq_range2 = &rule2->freq_range; | |
524 | freq_range = &intersected_rule->freq_range; | |
525 | ||
526 | power_rule1 = &rule1->power_rule; | |
527 | power_rule2 = &rule2->power_rule; | |
528 | power_rule = &intersected_rule->power_rule; | |
529 | ||
530 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
531 | freq_range2->start_freq_khz); | |
532 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
533 | freq_range2->end_freq_khz); | |
534 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
535 | freq_range2->max_bandwidth_khz); | |
536 | ||
537 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
538 | if (freq_range->max_bandwidth_khz > freq_diff) | |
539 | freq_range->max_bandwidth_khz = freq_diff; | |
540 | ||
541 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
542 | power_rule2->max_eirp); | |
543 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
544 | power_rule2->max_antenna_gain); | |
545 | ||
546 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
547 | ||
548 | if (!is_valid_reg_rule(intersected_rule)) | |
549 | return -EINVAL; | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | /** | |
555 | * regdom_intersect - do the intersection between two regulatory domains | |
556 | * @rd1: first regulatory domain | |
557 | * @rd2: second regulatory domain | |
558 | * | |
559 | * Use this function to get the intersection between two regulatory domains. | |
560 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
561 | * as no one single alpha2 can represent this regulatory domain. | |
562 | * | |
563 | * Returns a pointer to the regulatory domain structure which will hold the | |
564 | * resulting intersection of rules between rd1 and rd2. We will | |
565 | * kzalloc() this structure for you. | |
566 | */ | |
567 | static struct ieee80211_regdomain *regdom_intersect( | |
568 | const struct ieee80211_regdomain *rd1, | |
569 | const struct ieee80211_regdomain *rd2) | |
570 | { | |
571 | int r, size_of_regd; | |
572 | unsigned int x, y; | |
573 | unsigned int num_rules = 0, rule_idx = 0; | |
574 | const struct ieee80211_reg_rule *rule1, *rule2; | |
575 | struct ieee80211_reg_rule *intersected_rule; | |
576 | struct ieee80211_regdomain *rd; | |
577 | /* This is just a dummy holder to help us count */ | |
578 | struct ieee80211_reg_rule irule; | |
579 | ||
580 | /* Uses the stack temporarily for counter arithmetic */ | |
581 | intersected_rule = &irule; | |
582 | ||
583 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
584 | ||
585 | if (!rd1 || !rd2) | |
586 | return NULL; | |
587 | ||
fb1fc7ad LR |
588 | /* |
589 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
590 | * build them. This is to so we can malloc() and free() a |
591 | * regdomain once. The reason we use reg_rules_intersect() here | |
592 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
593 | * All rules that do check out OK are valid. |
594 | */ | |
9c96477d LR |
595 | |
596 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
597 | rule1 = &rd1->reg_rules[x]; | |
598 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
599 | rule2 = &rd2->reg_rules[y]; | |
600 | if (!reg_rules_intersect(rule1, rule2, | |
601 | intersected_rule)) | |
602 | num_rules++; | |
603 | memset(intersected_rule, 0, | |
604 | sizeof(struct ieee80211_reg_rule)); | |
605 | } | |
606 | } | |
607 | ||
608 | if (!num_rules) | |
609 | return NULL; | |
610 | ||
611 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
612 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
613 | ||
614 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
615 | if (!rd) | |
616 | return NULL; | |
617 | ||
618 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
619 | rule1 = &rd1->reg_rules[x]; | |
620 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
621 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
622 | /* |
623 | * This time around instead of using the stack lets | |
9c96477d | 624 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
625 | * a memcpy() |
626 | */ | |
9c96477d LR |
627 | intersected_rule = &rd->reg_rules[rule_idx]; |
628 | r = reg_rules_intersect(rule1, rule2, | |
629 | intersected_rule); | |
fb1fc7ad LR |
630 | /* |
631 | * No need to memset here the intersected rule here as | |
632 | * we're not using the stack anymore | |
633 | */ | |
9c96477d LR |
634 | if (r) |
635 | continue; | |
636 | rule_idx++; | |
637 | } | |
638 | } | |
639 | ||
640 | if (rule_idx != num_rules) { | |
641 | kfree(rd); | |
642 | return NULL; | |
643 | } | |
644 | ||
645 | rd->n_reg_rules = num_rules; | |
646 | rd->alpha2[0] = '9'; | |
647 | rd->alpha2[1] = '8'; | |
648 | ||
649 | return rd; | |
650 | } | |
651 | ||
fb1fc7ad LR |
652 | /* |
653 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
654 | * want to just have the channel structure use these | |
655 | */ | |
b2e1b302 LR |
656 | static u32 map_regdom_flags(u32 rd_flags) |
657 | { | |
658 | u32 channel_flags = 0; | |
659 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
660 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
661 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
662 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
663 | if (rd_flags & NL80211_RRF_DFS) | |
664 | channel_flags |= IEEE80211_CHAN_RADAR; | |
665 | return channel_flags; | |
666 | } | |
667 | ||
1fa25e41 LR |
668 | static int freq_reg_info_regd(struct wiphy *wiphy, |
669 | u32 center_freq, | |
038659e7 | 670 | u32 desired_bw_khz, |
1fa25e41 LR |
671 | const struct ieee80211_reg_rule **reg_rule, |
672 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
673 | { |
674 | int i; | |
0c7dc45d | 675 | bool band_rule_found = false; |
3e0c3ff3 | 676 | const struct ieee80211_regdomain *regd; |
038659e7 LR |
677 | bool bw_fits = false; |
678 | ||
679 | if (!desired_bw_khz) | |
680 | desired_bw_khz = MHZ_TO_KHZ(20); | |
8318d78a | 681 | |
1fa25e41 | 682 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 683 | |
fb1fc7ad LR |
684 | /* |
685 | * Follow the driver's regulatory domain, if present, unless a country | |
686 | * IE has been processed or a user wants to help complaince further | |
687 | */ | |
2784fe91 LR |
688 | if (!custom_regd && |
689 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
7db90f4a | 690 | last_request->initiator != NL80211_REGDOM_SET_BY_USER && |
3e0c3ff3 LR |
691 | wiphy->regd) |
692 | regd = wiphy->regd; | |
693 | ||
694 | if (!regd) | |
b2e1b302 LR |
695 | return -EINVAL; |
696 | ||
3e0c3ff3 | 697 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
698 | const struct ieee80211_reg_rule *rr; |
699 | const struct ieee80211_freq_range *fr = NULL; | |
b2e1b302 | 700 | |
3e0c3ff3 | 701 | rr = ®d->reg_rules[i]; |
b2e1b302 | 702 | fr = &rr->freq_range; |
0c7dc45d | 703 | |
fb1fc7ad LR |
704 | /* |
705 | * We only need to know if one frequency rule was | |
0c7dc45d | 706 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
707 | * not overwrite it once found |
708 | */ | |
0c7dc45d LR |
709 | if (!band_rule_found) |
710 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
711 | ||
038659e7 LR |
712 | bw_fits = reg_does_bw_fit(fr, |
713 | center_freq, | |
714 | desired_bw_khz); | |
0c7dc45d | 715 | |
038659e7 | 716 | if (band_rule_found && bw_fits) { |
b2e1b302 | 717 | *reg_rule = rr; |
038659e7 | 718 | return 0; |
8318d78a JB |
719 | } |
720 | } | |
721 | ||
0c7dc45d LR |
722 | if (!band_rule_found) |
723 | return -ERANGE; | |
724 | ||
038659e7 | 725 | return -EINVAL; |
b2e1b302 LR |
726 | } |
727 | ||
038659e7 LR |
728 | int freq_reg_info(struct wiphy *wiphy, |
729 | u32 center_freq, | |
730 | u32 desired_bw_khz, | |
731 | const struct ieee80211_reg_rule **reg_rule) | |
1fa25e41 | 732 | { |
ac46d48e | 733 | assert_cfg80211_lock(); |
038659e7 LR |
734 | return freq_reg_info_regd(wiphy, |
735 | center_freq, | |
736 | desired_bw_khz, | |
737 | reg_rule, | |
738 | NULL); | |
1fa25e41 | 739 | } |
4f366c5d | 740 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 741 | |
926a0a09 LR |
742 | #ifdef CONFIG_CFG80211_REG_DEBUG |
743 | static const char *reg_initiator_name(enum nl80211_reg_initiator initiator) | |
744 | { | |
745 | switch (initiator) { | |
746 | case NL80211_REGDOM_SET_BY_CORE: | |
747 | return "Set by core"; | |
748 | case NL80211_REGDOM_SET_BY_USER: | |
749 | return "Set by user"; | |
750 | case NL80211_REGDOM_SET_BY_DRIVER: | |
751 | return "Set by driver"; | |
752 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
753 | return "Set by country IE"; | |
754 | default: | |
755 | WARN_ON(1); | |
756 | return "Set by bug"; | |
757 | } | |
758 | } | |
e702d3cf LR |
759 | |
760 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, | |
761 | u32 desired_bw_khz, | |
762 | const struct ieee80211_reg_rule *reg_rule) | |
763 | { | |
764 | const struct ieee80211_power_rule *power_rule; | |
765 | const struct ieee80211_freq_range *freq_range; | |
766 | char max_antenna_gain[32]; | |
767 | ||
768 | power_rule = ®_rule->power_rule; | |
769 | freq_range = ®_rule->freq_range; | |
770 | ||
771 | if (!power_rule->max_antenna_gain) | |
772 | snprintf(max_antenna_gain, 32, "N/A"); | |
773 | else | |
774 | snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain); | |
775 | ||
d91e41b6 | 776 | REG_DBG_PRINT("Updating information on frequency %d MHz " |
ff039c6f | 777 | "for a %d MHz width channel with regulatory rule:\n", |
e702d3cf LR |
778 | chan->center_freq, |
779 | KHZ_TO_MHZ(desired_bw_khz)); | |
780 | ||
56e6786e | 781 | REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n", |
e702d3cf LR |
782 | freq_range->start_freq_khz, |
783 | freq_range->end_freq_khz, | |
56e6786e | 784 | freq_range->max_bandwidth_khz, |
e702d3cf LR |
785 | max_antenna_gain, |
786 | power_rule->max_eirp); | |
787 | } | |
788 | #else | |
789 | static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, | |
790 | u32 desired_bw_khz, | |
791 | const struct ieee80211_reg_rule *reg_rule) | |
792 | { | |
793 | return; | |
794 | } | |
926a0a09 LR |
795 | #endif |
796 | ||
038659e7 LR |
797 | /* |
798 | * Note that right now we assume the desired channel bandwidth | |
799 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz | |
800 | * per channel, the primary and the extension channel). To support | |
801 | * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a | |
802 | * new ieee80211_channel.target_bw and re run the regulatory check | |
803 | * on the wiphy with the target_bw specified. Then we can simply use | |
804 | * that below for the desired_bw_khz below. | |
805 | */ | |
7ca43d03 LR |
806 | static void handle_channel(struct wiphy *wiphy, |
807 | enum nl80211_reg_initiator initiator, | |
808 | enum ieee80211_band band, | |
a92a3ce7 | 809 | unsigned int chan_idx) |
b2e1b302 LR |
810 | { |
811 | int r; | |
038659e7 LR |
812 | u32 flags, bw_flags = 0; |
813 | u32 desired_bw_khz = MHZ_TO_KHZ(20); | |
b2e1b302 LR |
814 | const struct ieee80211_reg_rule *reg_rule = NULL; |
815 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 816 | const struct ieee80211_freq_range *freq_range = NULL; |
a92a3ce7 LR |
817 | struct ieee80211_supported_band *sband; |
818 | struct ieee80211_channel *chan; | |
fe33eb39 | 819 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 820 | |
761cf7ec LR |
821 | assert_cfg80211_lock(); |
822 | ||
806a9e39 LR |
823 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
824 | ||
a92a3ce7 LR |
825 | sband = wiphy->bands[band]; |
826 | BUG_ON(chan_idx >= sband->n_channels); | |
827 | chan = &sband->channels[chan_idx]; | |
828 | ||
829 | flags = chan->orig_flags; | |
b2e1b302 | 830 | |
038659e7 LR |
831 | r = freq_reg_info(wiphy, |
832 | MHZ_TO_KHZ(chan->center_freq), | |
833 | desired_bw_khz, | |
834 | ®_rule); | |
b2e1b302 | 835 | |
ca4ffe8f LR |
836 | if (r) { |
837 | /* | |
838 | * We will disable all channels that do not match our | |
25985edc | 839 | * received regulatory rule unless the hint is coming |
ca4ffe8f LR |
840 | * from a Country IE and the Country IE had no information |
841 | * about a band. The IEEE 802.11 spec allows for an AP | |
842 | * to send only a subset of the regulatory rules allowed, | |
843 | * so an AP in the US that only supports 2.4 GHz may only send | |
844 | * a country IE with information for the 2.4 GHz band | |
845 | * while 5 GHz is still supported. | |
846 | */ | |
847 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
848 | r == -ERANGE) | |
849 | return; | |
850 | ||
d91e41b6 | 851 | REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq); |
ca4ffe8f | 852 | chan->flags = IEEE80211_CHAN_DISABLED; |
8318d78a | 853 | return; |
ca4ffe8f | 854 | } |
8318d78a | 855 | |
e702d3cf LR |
856 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
857 | ||
b2e1b302 | 858 | power_rule = ®_rule->power_rule; |
038659e7 LR |
859 | freq_range = ®_rule->freq_range; |
860 | ||
861 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
862 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
b2e1b302 | 863 | |
7db90f4a | 864 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
806a9e39 | 865 | request_wiphy && request_wiphy == wiphy && |
5be83de5 | 866 | request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
fb1fc7ad | 867 | /* |
25985edc | 868 | * This guarantees the driver's requested regulatory domain |
f976376d | 869 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
870 | * settings |
871 | */ | |
f976376d | 872 | chan->flags = chan->orig_flags = |
038659e7 | 873 | map_regdom_flags(reg_rule->flags) | bw_flags; |
f976376d LR |
874 | chan->max_antenna_gain = chan->orig_mag = |
875 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
f976376d LR |
876 | chan->max_power = chan->orig_mpwr = |
877 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
878 | return; | |
879 | } | |
880 | ||
aa3d7eef | 881 | chan->beacon_found = false; |
038659e7 | 882 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 883 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 | 884 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
061acaae LR |
885 | if (chan->orig_mpwr) { |
886 | /* | |
887 | * Devices that have their own custom regulatory domain | |
888 | * but also use WIPHY_FLAG_STRICT_REGULATORY will follow the | |
889 | * passed country IE power settings. | |
890 | */ | |
891 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
892 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY && | |
893 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { | |
894 | chan->max_power = | |
895 | MBM_TO_DBM(power_rule->max_eirp); | |
896 | } else { | |
897 | chan->max_power = min(chan->orig_mpwr, | |
898 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
899 | } | |
900 | } else | |
b2e1b302 | 901 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
902 | } |
903 | ||
7ca43d03 LR |
904 | static void handle_band(struct wiphy *wiphy, |
905 | enum ieee80211_band band, | |
906 | enum nl80211_reg_initiator initiator) | |
8318d78a | 907 | { |
a92a3ce7 LR |
908 | unsigned int i; |
909 | struct ieee80211_supported_band *sband; | |
910 | ||
911 | BUG_ON(!wiphy->bands[band]); | |
912 | sband = wiphy->bands[band]; | |
8318d78a JB |
913 | |
914 | for (i = 0; i < sband->n_channels; i++) | |
7ca43d03 | 915 | handle_channel(wiphy, initiator, band, i); |
8318d78a JB |
916 | } |
917 | ||
7db90f4a LR |
918 | static bool ignore_reg_update(struct wiphy *wiphy, |
919 | enum nl80211_reg_initiator initiator) | |
14b9815a | 920 | { |
926a0a09 | 921 | if (!last_request) { |
d91e41b6 | 922 | REG_DBG_PRINT("Ignoring regulatory request %s since " |
926a0a09 LR |
923 | "last_request is not set\n", |
924 | reg_initiator_name(initiator)); | |
14b9815a | 925 | return true; |
926a0a09 LR |
926 | } |
927 | ||
7db90f4a | 928 | if (initiator == NL80211_REGDOM_SET_BY_CORE && |
926a0a09 | 929 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { |
d91e41b6 | 930 | REG_DBG_PRINT("Ignoring regulatory request %s " |
926a0a09 | 931 | "since the driver uses its own custom " |
12c5ffb5 | 932 | "regulatory domain\n", |
926a0a09 | 933 | reg_initiator_name(initiator)); |
14b9815a | 934 | return true; |
926a0a09 LR |
935 | } |
936 | ||
fb1fc7ad LR |
937 | /* |
938 | * wiphy->regd will be set once the device has its own | |
939 | * desired regulatory domain set | |
940 | */ | |
5be83de5 | 941 | if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && |
749b527b | 942 | initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && |
926a0a09 | 943 | !is_world_regdom(last_request->alpha2)) { |
d91e41b6 | 944 | REG_DBG_PRINT("Ignoring regulatory request %s " |
5bc91db8 | 945 | "since the driver requires its own regulatory " |
12c5ffb5 | 946 | "domain to be set first\n", |
926a0a09 | 947 | reg_initiator_name(initiator)); |
14b9815a | 948 | return true; |
926a0a09 LR |
949 | } |
950 | ||
14b9815a LR |
951 | return false; |
952 | } | |
953 | ||
e38f8a7a LR |
954 | static void handle_reg_beacon(struct wiphy *wiphy, |
955 | unsigned int chan_idx, | |
956 | struct reg_beacon *reg_beacon) | |
957 | { | |
e38f8a7a LR |
958 | struct ieee80211_supported_band *sband; |
959 | struct ieee80211_channel *chan; | |
6bad8766 LR |
960 | bool channel_changed = false; |
961 | struct ieee80211_channel chan_before; | |
e38f8a7a LR |
962 | |
963 | assert_cfg80211_lock(); | |
964 | ||
965 | sband = wiphy->bands[reg_beacon->chan.band]; | |
966 | chan = &sband->channels[chan_idx]; | |
967 | ||
968 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
969 | return; | |
970 | ||
6bad8766 LR |
971 | if (chan->beacon_found) |
972 | return; | |
973 | ||
974 | chan->beacon_found = true; | |
975 | ||
5be83de5 | 976 | if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) |
37184244 LR |
977 | return; |
978 | ||
6bad8766 LR |
979 | chan_before.center_freq = chan->center_freq; |
980 | chan_before.flags = chan->flags; | |
981 | ||
37184244 | 982 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { |
e38f8a7a | 983 | chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; |
6bad8766 | 984 | channel_changed = true; |
e38f8a7a LR |
985 | } |
986 | ||
37184244 | 987 | if (chan->flags & IEEE80211_CHAN_NO_IBSS) { |
e38f8a7a | 988 | chan->flags &= ~IEEE80211_CHAN_NO_IBSS; |
6bad8766 | 989 | channel_changed = true; |
e38f8a7a LR |
990 | } |
991 | ||
6bad8766 LR |
992 | if (channel_changed) |
993 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
e38f8a7a LR |
994 | } |
995 | ||
996 | /* | |
997 | * Called when a scan on a wiphy finds a beacon on | |
998 | * new channel | |
999 | */ | |
1000 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
1001 | struct reg_beacon *reg_beacon) | |
1002 | { | |
1003 | unsigned int i; | |
1004 | struct ieee80211_supported_band *sband; | |
1005 | ||
1006 | assert_cfg80211_lock(); | |
1007 | ||
1008 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1009 | return; | |
1010 | ||
1011 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1012 | ||
1013 | for (i = 0; i < sband->n_channels; i++) | |
1014 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1015 | } | |
1016 | ||
1017 | /* | |
1018 | * Called upon reg changes or a new wiphy is added | |
1019 | */ | |
1020 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1021 | { | |
1022 | unsigned int i; | |
1023 | struct ieee80211_supported_band *sband; | |
1024 | struct reg_beacon *reg_beacon; | |
1025 | ||
1026 | assert_cfg80211_lock(); | |
1027 | ||
1028 | if (list_empty(®_beacon_list)) | |
1029 | return; | |
1030 | ||
1031 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1032 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1033 | continue; | |
1034 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1035 | for (i = 0; i < sband->n_channels; i++) | |
1036 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1041 | { | |
1042 | if (is_world_regdom(cfg80211_regdomain->alpha2) || | |
1043 | (wiphy->regd && is_world_regdom(wiphy->regd->alpha2))) | |
1044 | return true; | |
b1ed8ddd LR |
1045 | if (last_request && |
1046 | last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
5be83de5 | 1047 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) |
e38f8a7a LR |
1048 | return true; |
1049 | return false; | |
1050 | } | |
1051 | ||
1052 | /* Reap the advantages of previously found beacons */ | |
1053 | static void reg_process_beacons(struct wiphy *wiphy) | |
1054 | { | |
b1ed8ddd LR |
1055 | /* |
1056 | * Means we are just firing up cfg80211, so no beacons would | |
1057 | * have been processed yet. | |
1058 | */ | |
1059 | if (!last_request) | |
1060 | return; | |
e38f8a7a LR |
1061 | if (!reg_is_world_roaming(wiphy)) |
1062 | return; | |
1063 | wiphy_update_beacon_reg(wiphy); | |
1064 | } | |
1065 | ||
038659e7 LR |
1066 | static bool is_ht40_not_allowed(struct ieee80211_channel *chan) |
1067 | { | |
1068 | if (!chan) | |
1069 | return true; | |
1070 | if (chan->flags & IEEE80211_CHAN_DISABLED) | |
1071 | return true; | |
1072 | /* This would happen when regulatory rules disallow HT40 completely */ | |
1073 | if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40))) | |
1074 | return true; | |
1075 | return false; | |
1076 | } | |
1077 | ||
1078 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, | |
1079 | enum ieee80211_band band, | |
1080 | unsigned int chan_idx) | |
1081 | { | |
1082 | struct ieee80211_supported_band *sband; | |
1083 | struct ieee80211_channel *channel; | |
1084 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; | |
1085 | unsigned int i; | |
1086 | ||
1087 | assert_cfg80211_lock(); | |
1088 | ||
1089 | sband = wiphy->bands[band]; | |
1090 | BUG_ON(chan_idx >= sband->n_channels); | |
1091 | channel = &sband->channels[chan_idx]; | |
1092 | ||
1093 | if (is_ht40_not_allowed(channel)) { | |
1094 | channel->flags |= IEEE80211_CHAN_NO_HT40; | |
1095 | return; | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * We need to ensure the extension channels exist to | |
1100 | * be able to use HT40- or HT40+, this finds them (or not) | |
1101 | */ | |
1102 | for (i = 0; i < sband->n_channels; i++) { | |
1103 | struct ieee80211_channel *c = &sband->channels[i]; | |
1104 | if (c->center_freq == (channel->center_freq - 20)) | |
1105 | channel_before = c; | |
1106 | if (c->center_freq == (channel->center_freq + 20)) | |
1107 | channel_after = c; | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * Please note that this assumes target bandwidth is 20 MHz, | |
1112 | * if that ever changes we also need to change the below logic | |
1113 | * to include that as well. | |
1114 | */ | |
1115 | if (is_ht40_not_allowed(channel_before)) | |
689da1b3 | 1116 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 | 1117 | else |
689da1b3 | 1118 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; |
038659e7 LR |
1119 | |
1120 | if (is_ht40_not_allowed(channel_after)) | |
689da1b3 | 1121 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 | 1122 | else |
689da1b3 | 1123 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; |
038659e7 LR |
1124 | } |
1125 | ||
1126 | static void reg_process_ht_flags_band(struct wiphy *wiphy, | |
1127 | enum ieee80211_band band) | |
1128 | { | |
1129 | unsigned int i; | |
1130 | struct ieee80211_supported_band *sband; | |
1131 | ||
1132 | BUG_ON(!wiphy->bands[band]); | |
1133 | sband = wiphy->bands[band]; | |
1134 | ||
1135 | for (i = 0; i < sband->n_channels; i++) | |
1136 | reg_process_ht_flags_channel(wiphy, band, i); | |
1137 | } | |
1138 | ||
1139 | static void reg_process_ht_flags(struct wiphy *wiphy) | |
1140 | { | |
1141 | enum ieee80211_band band; | |
1142 | ||
1143 | if (!wiphy) | |
1144 | return; | |
1145 | ||
1146 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1147 | if (wiphy->bands[band]) | |
1148 | reg_process_ht_flags_band(wiphy, band); | |
1149 | } | |
1150 | ||
1151 | } | |
1152 | ||
eac03e38 SN |
1153 | static void wiphy_update_regulatory(struct wiphy *wiphy, |
1154 | enum nl80211_reg_initiator initiator) | |
b2e1b302 LR |
1155 | { |
1156 | enum ieee80211_band band; | |
d46e5b1d | 1157 | |
eac03e38 SN |
1158 | assert_reg_lock(); |
1159 | ||
7db90f4a | 1160 | if (ignore_reg_update(wiphy, initiator)) |
a203c2aa SN |
1161 | return; |
1162 | ||
b68e6b3b LR |
1163 | last_request->dfs_region = cfg80211_regdomain->dfs_region; |
1164 | ||
b2e1b302 | 1165 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1166 | if (wiphy->bands[band]) |
7ca43d03 | 1167 | handle_band(wiphy, band, initiator); |
b2e1b302 | 1168 | } |
a203c2aa | 1169 | |
e38f8a7a | 1170 | reg_process_beacons(wiphy); |
038659e7 | 1171 | reg_process_ht_flags(wiphy); |
560e28e1 | 1172 | if (wiphy->reg_notifier) |
716f9392 | 1173 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1174 | } |
1175 | ||
eac03e38 SN |
1176 | void regulatory_update(struct wiphy *wiphy, |
1177 | enum nl80211_reg_initiator setby) | |
1178 | { | |
1179 | mutex_lock(®_mutex); | |
1180 | wiphy_update_regulatory(wiphy, setby); | |
1181 | mutex_unlock(®_mutex); | |
1182 | } | |
1183 | ||
d7549cbb SN |
1184 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) |
1185 | { | |
1186 | struct cfg80211_registered_device *rdev; | |
4a38994f | 1187 | struct wiphy *wiphy; |
d7549cbb | 1188 | |
4a38994f RM |
1189 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { |
1190 | wiphy = &rdev->wiphy; | |
1191 | wiphy_update_regulatory(wiphy, initiator); | |
1192 | /* | |
1193 | * Regulatory updates set by CORE are ignored for custom | |
1194 | * regulatory cards. Let us notify the changes to the driver, | |
1195 | * as some drivers used this to restore its orig_* reg domain. | |
1196 | */ | |
1197 | if (initiator == NL80211_REGDOM_SET_BY_CORE && | |
1198 | wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY && | |
1199 | wiphy->reg_notifier) | |
1200 | wiphy->reg_notifier(wiphy, last_request); | |
1201 | } | |
d7549cbb SN |
1202 | } |
1203 | ||
1fa25e41 LR |
1204 | static void handle_channel_custom(struct wiphy *wiphy, |
1205 | enum ieee80211_band band, | |
1206 | unsigned int chan_idx, | |
1207 | const struct ieee80211_regdomain *regd) | |
1208 | { | |
1209 | int r; | |
038659e7 LR |
1210 | u32 desired_bw_khz = MHZ_TO_KHZ(20); |
1211 | u32 bw_flags = 0; | |
1fa25e41 LR |
1212 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1213 | const struct ieee80211_power_rule *power_rule = NULL; | |
038659e7 | 1214 | const struct ieee80211_freq_range *freq_range = NULL; |
1fa25e41 LR |
1215 | struct ieee80211_supported_band *sband; |
1216 | struct ieee80211_channel *chan; | |
1217 | ||
abc7381b | 1218 | assert_reg_lock(); |
ac46d48e | 1219 | |
1fa25e41 LR |
1220 | sband = wiphy->bands[band]; |
1221 | BUG_ON(chan_idx >= sband->n_channels); | |
1222 | chan = &sband->channels[chan_idx]; | |
1223 | ||
038659e7 LR |
1224 | r = freq_reg_info_regd(wiphy, |
1225 | MHZ_TO_KHZ(chan->center_freq), | |
1226 | desired_bw_khz, | |
1227 | ®_rule, | |
1228 | regd); | |
1fa25e41 LR |
1229 | |
1230 | if (r) { | |
d91e41b6 | 1231 | REG_DBG_PRINT("Disabling freq %d MHz as custom " |
a6518536 LR |
1232 | "regd has no rule that fits a %d MHz " |
1233 | "wide channel\n", | |
1234 | chan->center_freq, | |
1235 | KHZ_TO_MHZ(desired_bw_khz)); | |
1fa25e41 LR |
1236 | chan->flags = IEEE80211_CHAN_DISABLED; |
1237 | return; | |
1238 | } | |
1239 | ||
e702d3cf LR |
1240 | chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule); |
1241 | ||
1fa25e41 | 1242 | power_rule = ®_rule->power_rule; |
038659e7 LR |
1243 | freq_range = ®_rule->freq_range; |
1244 | ||
1245 | if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1246 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
1fa25e41 | 1247 | |
038659e7 | 1248 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; |
1fa25e41 | 1249 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); |
1fa25e41 LR |
1250 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
1251 | } | |
1252 | ||
1253 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1254 | const struct ieee80211_regdomain *regd) | |
1255 | { | |
1256 | unsigned int i; | |
1257 | struct ieee80211_supported_band *sband; | |
1258 | ||
1259 | BUG_ON(!wiphy->bands[band]); | |
1260 | sband = wiphy->bands[band]; | |
1261 | ||
1262 | for (i = 0; i < sband->n_channels; i++) | |
1263 | handle_channel_custom(wiphy, band, i, regd); | |
1264 | } | |
1265 | ||
1266 | /* Used by drivers prior to wiphy registration */ | |
1267 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1268 | const struct ieee80211_regdomain *regd) | |
1269 | { | |
1270 | enum ieee80211_band band; | |
bbcf3f02 | 1271 | unsigned int bands_set = 0; |
ac46d48e | 1272 | |
abc7381b | 1273 | mutex_lock(®_mutex); |
1fa25e41 | 1274 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
bbcf3f02 LR |
1275 | if (!wiphy->bands[band]) |
1276 | continue; | |
1277 | handle_band_custom(wiphy, band, regd); | |
1278 | bands_set++; | |
b2e1b302 | 1279 | } |
abc7381b | 1280 | mutex_unlock(®_mutex); |
bbcf3f02 LR |
1281 | |
1282 | /* | |
1283 | * no point in calling this if it won't have any effect | |
1284 | * on your device's supportd bands. | |
1285 | */ | |
1286 | WARN_ON(!bands_set); | |
b2e1b302 | 1287 | } |
1fa25e41 LR |
1288 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1289 | ||
fb1fc7ad LR |
1290 | /* |
1291 | * Return value which can be used by ignore_request() to indicate | |
1292 | * it has been determined we should intersect two regulatory domains | |
1293 | */ | |
9c96477d LR |
1294 | #define REG_INTERSECT 1 |
1295 | ||
84fa4f43 JB |
1296 | /* This has the logic which determines when a new request |
1297 | * should be ignored. */ | |
2f92cd2e LR |
1298 | static int ignore_request(struct wiphy *wiphy, |
1299 | struct regulatory_request *pending_request) | |
84fa4f43 | 1300 | { |
806a9e39 | 1301 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1302 | |
1303 | assert_cfg80211_lock(); | |
1304 | ||
84fa4f43 JB |
1305 | /* All initial requests are respected */ |
1306 | if (!last_request) | |
1307 | return 0; | |
1308 | ||
2f92cd2e | 1309 | switch (pending_request->initiator) { |
7db90f4a | 1310 | case NL80211_REGDOM_SET_BY_CORE: |
09d989d1 | 1311 | return 0; |
7db90f4a | 1312 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1313 | |
1314 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1315 | ||
2f92cd2e | 1316 | if (unlikely(!is_an_alpha2(pending_request->alpha2))) |
84fa4f43 | 1317 | return -EINVAL; |
7db90f4a LR |
1318 | if (last_request->initiator == |
1319 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1320 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1321 | /* |
1322 | * Two cards with two APs claiming different | |
1fe90b03 | 1323 | * Country IE alpha2s. We could |
84fa4f43 JB |
1324 | * intersect them, but that seems unlikely |
1325 | * to be correct. Reject second one for now. | |
1326 | */ | |
2f92cd2e | 1327 | if (regdom_changes(pending_request->alpha2)) |
84fa4f43 JB |
1328 | return -EOPNOTSUPP; |
1329 | return -EALREADY; | |
1330 | } | |
fb1fc7ad LR |
1331 | /* |
1332 | * Two consecutive Country IE hints on the same wiphy. | |
1333 | * This should be picked up early by the driver/stack | |
1334 | */ | |
2f92cd2e | 1335 | if (WARN_ON(regdom_changes(pending_request->alpha2))) |
84fa4f43 JB |
1336 | return 0; |
1337 | return -EALREADY; | |
1338 | } | |
a171fba4 | 1339 | return 0; |
7db90f4a LR |
1340 | case NL80211_REGDOM_SET_BY_DRIVER: |
1341 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
2f92cd2e | 1342 | if (regdom_changes(pending_request->alpha2)) |
e74b1e7f | 1343 | return 0; |
84fa4f43 | 1344 | return -EALREADY; |
e74b1e7f | 1345 | } |
fff32c04 LR |
1346 | |
1347 | /* | |
1348 | * This would happen if you unplug and plug your card | |
1349 | * back in or if you add a new device for which the previously | |
1350 | * loaded card also agrees on the regulatory domain. | |
1351 | */ | |
7db90f4a | 1352 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER && |
2f92cd2e | 1353 | !regdom_changes(pending_request->alpha2)) |
fff32c04 LR |
1354 | return -EALREADY; |
1355 | ||
3e0c3ff3 | 1356 | return REG_INTERSECT; |
7db90f4a LR |
1357 | case NL80211_REGDOM_SET_BY_USER: |
1358 | if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
9c96477d | 1359 | return REG_INTERSECT; |
fb1fc7ad LR |
1360 | /* |
1361 | * If the user knows better the user should set the regdom | |
1362 | * to their country before the IE is picked up | |
1363 | */ | |
7db90f4a | 1364 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER && |
3f2355cb LR |
1365 | last_request->intersect) |
1366 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1367 | /* |
1368 | * Process user requests only after previous user/driver/core | |
1369 | * requests have been processed | |
1370 | */ | |
7db90f4a LR |
1371 | if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE || |
1372 | last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1373 | last_request->initiator == NL80211_REGDOM_SET_BY_USER) { | |
69b1572b | 1374 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1375 | return -EAGAIN; |
1376 | } | |
1377 | ||
baeb66fe | 1378 | if (!regdom_changes(pending_request->alpha2)) |
e74b1e7f LR |
1379 | return -EALREADY; |
1380 | ||
84fa4f43 JB |
1381 | return 0; |
1382 | } | |
1383 | ||
1384 | return -EINVAL; | |
1385 | } | |
1386 | ||
b2e253cf LR |
1387 | static void reg_set_request_processed(void) |
1388 | { | |
1389 | bool need_more_processing = false; | |
1390 | ||
1391 | last_request->processed = true; | |
1392 | ||
1393 | spin_lock(®_requests_lock); | |
1394 | if (!list_empty(®_requests_list)) | |
1395 | need_more_processing = true; | |
1396 | spin_unlock(®_requests_lock); | |
1397 | ||
a90c7a31 LR |
1398 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) |
1399 | cancel_delayed_work_sync(®_timeout); | |
1400 | ||
b2e253cf LR |
1401 | if (need_more_processing) |
1402 | schedule_work(®_work); | |
1403 | } | |
1404 | ||
d1c96a9a LR |
1405 | /** |
1406 | * __regulatory_hint - hint to the wireless core a regulatory domain | |
1407 | * @wiphy: if the hint comes from country information from an AP, this | |
1408 | * is required to be set to the wiphy that received the information | |
28da32d7 | 1409 | * @pending_request: the regulatory request currently being processed |
d1c96a9a LR |
1410 | * |
1411 | * The Wireless subsystem can use this function to hint to the wireless core | |
28da32d7 | 1412 | * what it believes should be the current regulatory domain. |
d1c96a9a LR |
1413 | * |
1414 | * Returns zero if all went fine, %-EALREADY if a regulatory domain had | |
1415 | * already been set or other standard error codes. | |
1416 | * | |
abc7381b | 1417 | * Caller must hold &cfg80211_mutex and ®_mutex |
d1c96a9a | 1418 | */ |
28da32d7 LR |
1419 | static int __regulatory_hint(struct wiphy *wiphy, |
1420 | struct regulatory_request *pending_request) | |
b2e1b302 | 1421 | { |
9c96477d | 1422 | bool intersect = false; |
b2e1b302 LR |
1423 | int r = 0; |
1424 | ||
761cf7ec LR |
1425 | assert_cfg80211_lock(); |
1426 | ||
2f92cd2e | 1427 | r = ignore_request(wiphy, pending_request); |
9c96477d | 1428 | |
3e0c3ff3 | 1429 | if (r == REG_INTERSECT) { |
7db90f4a LR |
1430 | if (pending_request->initiator == |
1431 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1432 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1433 | if (r) { |
1434 | kfree(pending_request); | |
3e0c3ff3 | 1435 | return r; |
d951c1dd | 1436 | } |
3e0c3ff3 | 1437 | } |
9c96477d | 1438 | intersect = true; |
3e0c3ff3 | 1439 | } else if (r) { |
fb1fc7ad LR |
1440 | /* |
1441 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1442 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1443 | * wiphy |
1444 | */ | |
28da32d7 | 1445 | if (r == -EALREADY && |
7db90f4a LR |
1446 | pending_request->initiator == |
1447 | NL80211_REGDOM_SET_BY_DRIVER) { | |
3e0c3ff3 | 1448 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); |
d951c1dd LR |
1449 | if (r) { |
1450 | kfree(pending_request); | |
3e0c3ff3 | 1451 | return r; |
d951c1dd | 1452 | } |
3e0c3ff3 LR |
1453 | r = -EALREADY; |
1454 | goto new_request; | |
1455 | } | |
d951c1dd | 1456 | kfree(pending_request); |
b2e1b302 | 1457 | return r; |
3e0c3ff3 | 1458 | } |
b2e1b302 | 1459 | |
3e0c3ff3 | 1460 | new_request: |
a042994d LR |
1461 | if (last_request != &core_request_world) |
1462 | kfree(last_request); | |
5203cdb6 | 1463 | |
d951c1dd LR |
1464 | last_request = pending_request; |
1465 | last_request->intersect = intersect; | |
5203cdb6 | 1466 | |
d951c1dd | 1467 | pending_request = NULL; |
3e0c3ff3 | 1468 | |
09d989d1 LR |
1469 | if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) { |
1470 | user_alpha2[0] = last_request->alpha2[0]; | |
1471 | user_alpha2[1] = last_request->alpha2[1]; | |
1472 | } | |
1473 | ||
3e0c3ff3 | 1474 | /* When r == REG_INTERSECT we do need to call CRDA */ |
73d54c9e LR |
1475 | if (r < 0) { |
1476 | /* | |
1477 | * Since CRDA will not be called in this case as we already | |
1478 | * have applied the requested regulatory domain before we just | |
1479 | * inform userspace we have processed the request | |
1480 | */ | |
b2e253cf | 1481 | if (r == -EALREADY) { |
73d54c9e | 1482 | nl80211_send_reg_change_event(last_request); |
b2e253cf LR |
1483 | reg_set_request_processed(); |
1484 | } | |
3e0c3ff3 | 1485 | return r; |
73d54c9e | 1486 | } |
3e0c3ff3 | 1487 | |
d951c1dd | 1488 | return call_crda(last_request->alpha2); |
b2e1b302 LR |
1489 | } |
1490 | ||
30a548c7 | 1491 | /* This processes *all* regulatory hints */ |
8848bef0 LR |
1492 | static void reg_process_hint(struct regulatory_request *reg_request, |
1493 | enum nl80211_reg_initiator reg_initiator) | |
fe33eb39 LR |
1494 | { |
1495 | int r = 0; | |
1496 | struct wiphy *wiphy = NULL; | |
1497 | ||
1498 | BUG_ON(!reg_request->alpha2); | |
1499 | ||
fe33eb39 LR |
1500 | if (wiphy_idx_valid(reg_request->wiphy_idx)) |
1501 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1502 | ||
8848bef0 | 1503 | if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER && |
fe33eb39 | 1504 | !wiphy) { |
d951c1dd | 1505 | kfree(reg_request); |
b0e2880b | 1506 | return; |
fe33eb39 LR |
1507 | } |
1508 | ||
28da32d7 | 1509 | r = __regulatory_hint(wiphy, reg_request); |
fe33eb39 | 1510 | /* This is required so that the orig_* parameters are saved */ |
5be83de5 | 1511 | if (r == -EALREADY && wiphy && |
a90c7a31 | 1512 | wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { |
8848bef0 | 1513 | wiphy_update_regulatory(wiphy, reg_initiator); |
a90c7a31 LR |
1514 | return; |
1515 | } | |
1516 | ||
1517 | /* | |
1518 | * We only time out user hints, given that they should be the only | |
1519 | * source of bogus requests. | |
1520 | */ | |
c989bb15 | 1521 | if (r != -EALREADY && |
8848bef0 | 1522 | reg_initiator == NL80211_REGDOM_SET_BY_USER) |
a90c7a31 | 1523 | schedule_delayed_work(®_timeout, msecs_to_jiffies(3142)); |
fe33eb39 LR |
1524 | } |
1525 | ||
b2e253cf LR |
1526 | /* |
1527 | * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* | |
1528 | * Regulatory hints come on a first come first serve basis and we | |
1529 | * must process each one atomically. | |
1530 | */ | |
fe33eb39 | 1531 | static void reg_process_pending_hints(void) |
b0e2880b | 1532 | { |
fe33eb39 | 1533 | struct regulatory_request *reg_request; |
fe33eb39 | 1534 | |
b0e2880b LR |
1535 | mutex_lock(&cfg80211_mutex); |
1536 | mutex_lock(®_mutex); | |
1537 | ||
b2e253cf LR |
1538 | /* When last_request->processed becomes true this will be rescheduled */ |
1539 | if (last_request && !last_request->processed) { | |
1540 | REG_DBG_PRINT("Pending regulatory request, waiting " | |
12c5ffb5 | 1541 | "for it to be processed...\n"); |
b2e253cf LR |
1542 | goto out; |
1543 | } | |
1544 | ||
fe33eb39 | 1545 | spin_lock(®_requests_lock); |
fe33eb39 | 1546 | |
b2e253cf | 1547 | if (list_empty(®_requests_list)) { |
d951c1dd | 1548 | spin_unlock(®_requests_lock); |
b2e253cf | 1549 | goto out; |
fe33eb39 | 1550 | } |
b2e253cf LR |
1551 | |
1552 | reg_request = list_first_entry(®_requests_list, | |
1553 | struct regulatory_request, | |
1554 | list); | |
1555 | list_del_init(®_request->list); | |
1556 | ||
fe33eb39 | 1557 | spin_unlock(®_requests_lock); |
b0e2880b | 1558 | |
8848bef0 | 1559 | reg_process_hint(reg_request, reg_request->initiator); |
b2e253cf LR |
1560 | |
1561 | out: | |
b0e2880b LR |
1562 | mutex_unlock(®_mutex); |
1563 | mutex_unlock(&cfg80211_mutex); | |
fe33eb39 LR |
1564 | } |
1565 | ||
e38f8a7a LR |
1566 | /* Processes beacon hints -- this has nothing to do with country IEs */ |
1567 | static void reg_process_pending_beacon_hints(void) | |
1568 | { | |
79c97e97 | 1569 | struct cfg80211_registered_device *rdev; |
e38f8a7a LR |
1570 | struct reg_beacon *pending_beacon, *tmp; |
1571 | ||
abc7381b LR |
1572 | /* |
1573 | * No need to hold the reg_mutex here as we just touch wiphys | |
1574 | * and do not read or access regulatory variables. | |
1575 | */ | |
e38f8a7a LR |
1576 | mutex_lock(&cfg80211_mutex); |
1577 | ||
1578 | /* This goes through the _pending_ beacon list */ | |
1579 | spin_lock_bh(®_pending_beacons_lock); | |
1580 | ||
1581 | if (list_empty(®_pending_beacons)) { | |
1582 | spin_unlock_bh(®_pending_beacons_lock); | |
1583 | goto out; | |
1584 | } | |
1585 | ||
1586 | list_for_each_entry_safe(pending_beacon, tmp, | |
1587 | ®_pending_beacons, list) { | |
1588 | ||
1589 | list_del_init(&pending_beacon->list); | |
1590 | ||
1591 | /* Applies the beacon hint to current wiphys */ | |
79c97e97 JB |
1592 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) |
1593 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); | |
e38f8a7a LR |
1594 | |
1595 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
1596 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
1597 | } | |
1598 | ||
1599 | spin_unlock_bh(®_pending_beacons_lock); | |
1600 | out: | |
1601 | mutex_unlock(&cfg80211_mutex); | |
1602 | } | |
1603 | ||
fe33eb39 LR |
1604 | static void reg_todo(struct work_struct *work) |
1605 | { | |
1606 | reg_process_pending_hints(); | |
e38f8a7a | 1607 | reg_process_pending_beacon_hints(); |
fe33eb39 LR |
1608 | } |
1609 | ||
fe33eb39 LR |
1610 | static void queue_regulatory_request(struct regulatory_request *request) |
1611 | { | |
c61029c7 JL |
1612 | if (isalpha(request->alpha2[0])) |
1613 | request->alpha2[0] = toupper(request->alpha2[0]); | |
1614 | if (isalpha(request->alpha2[1])) | |
1615 | request->alpha2[1] = toupper(request->alpha2[1]); | |
1616 | ||
fe33eb39 LR |
1617 | spin_lock(®_requests_lock); |
1618 | list_add_tail(&request->list, ®_requests_list); | |
1619 | spin_unlock(®_requests_lock); | |
1620 | ||
1621 | schedule_work(®_work); | |
1622 | } | |
1623 | ||
09d989d1 LR |
1624 | /* |
1625 | * Core regulatory hint -- happens during cfg80211_init() | |
1626 | * and when we restore regulatory settings. | |
1627 | */ | |
ba25c141 LR |
1628 | static int regulatory_hint_core(const char *alpha2) |
1629 | { | |
1630 | struct regulatory_request *request; | |
1631 | ||
ba25c141 LR |
1632 | request = kzalloc(sizeof(struct regulatory_request), |
1633 | GFP_KERNEL); | |
1634 | if (!request) | |
1635 | return -ENOMEM; | |
1636 | ||
1637 | request->alpha2[0] = alpha2[0]; | |
1638 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1639 | request->initiator = NL80211_REGDOM_SET_BY_CORE; |
ba25c141 | 1640 | |
31e99729 | 1641 | queue_regulatory_request(request); |
5078b2e3 | 1642 | |
fe33eb39 | 1643 | return 0; |
ba25c141 LR |
1644 | } |
1645 | ||
fe33eb39 LR |
1646 | /* User hints */ |
1647 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1648 | { |
fe33eb39 LR |
1649 | struct regulatory_request *request; |
1650 | ||
be3d4810 | 1651 | BUG_ON(!alpha2); |
b2e1b302 | 1652 | |
fe33eb39 LR |
1653 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1654 | if (!request) | |
1655 | return -ENOMEM; | |
1656 | ||
1657 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1658 | request->alpha2[0] = alpha2[0]; | |
1659 | request->alpha2[1] = alpha2[1]; | |
e12822e1 | 1660 | request->initiator = NL80211_REGDOM_SET_BY_USER; |
fe33eb39 LR |
1661 | |
1662 | queue_regulatory_request(request); | |
1663 | ||
1664 | return 0; | |
1665 | } | |
1666 | ||
1667 | /* Driver hints */ | |
1668 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1669 | { | |
1670 | struct regulatory_request *request; | |
1671 | ||
1672 | BUG_ON(!alpha2); | |
1673 | BUG_ON(!wiphy); | |
1674 | ||
1675 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1676 | if (!request) | |
1677 | return -ENOMEM; | |
1678 | ||
1679 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1680 | ||
1681 | /* Must have registered wiphy first */ | |
1682 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1683 | ||
1684 | request->alpha2[0] = alpha2[0]; | |
1685 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1686 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; |
fe33eb39 LR |
1687 | |
1688 | queue_regulatory_request(request); | |
1689 | ||
1690 | return 0; | |
b2e1b302 LR |
1691 | } |
1692 | EXPORT_SYMBOL(regulatory_hint); | |
1693 | ||
4b44c8bc LR |
1694 | /* |
1695 | * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and | |
1696 | * therefore cannot iterate over the rdev list here. | |
1697 | */ | |
3f2355cb | 1698 | void regulatory_hint_11d(struct wiphy *wiphy, |
84920e3e LR |
1699 | enum ieee80211_band band, |
1700 | u8 *country_ie, | |
1701 | u8 country_ie_len) | |
3f2355cb | 1702 | { |
3f2355cb | 1703 | char alpha2[2]; |
3f2355cb | 1704 | enum environment_cap env = ENVIRON_ANY; |
fe33eb39 | 1705 | struct regulatory_request *request; |
3f2355cb | 1706 | |
abc7381b | 1707 | mutex_lock(®_mutex); |
3f2355cb | 1708 | |
9828b017 LR |
1709 | if (unlikely(!last_request)) |
1710 | goto out; | |
d335fe63 | 1711 | |
3f2355cb LR |
1712 | /* IE len must be evenly divisible by 2 */ |
1713 | if (country_ie_len & 0x01) | |
1714 | goto out; | |
1715 | ||
1716 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1717 | goto out; | |
1718 | ||
3f2355cb LR |
1719 | alpha2[0] = country_ie[0]; |
1720 | alpha2[1] = country_ie[1]; | |
1721 | ||
1722 | if (country_ie[2] == 'I') | |
1723 | env = ENVIRON_INDOOR; | |
1724 | else if (country_ie[2] == 'O') | |
1725 | env = ENVIRON_OUTDOOR; | |
1726 | ||
fb1fc7ad | 1727 | /* |
8b19e6ca | 1728 | * We will run this only upon a successful connection on cfg80211. |
4b44c8bc LR |
1729 | * We leave conflict resolution to the workqueue, where can hold |
1730 | * cfg80211_mutex. | |
fb1fc7ad | 1731 | */ |
cc0b6fe8 LR |
1732 | if (likely(last_request->initiator == |
1733 | NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
4b44c8bc LR |
1734 | wiphy_idx_valid(last_request->wiphy_idx))) |
1735 | goto out; | |
3f2355cb | 1736 | |
fe33eb39 LR |
1737 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1738 | if (!request) | |
f9f9b6e3 | 1739 | goto out; |
fe33eb39 | 1740 | |
fe33eb39 | 1741 | request->wiphy_idx = get_wiphy_idx(wiphy); |
4f366c5d JL |
1742 | request->alpha2[0] = alpha2[0]; |
1743 | request->alpha2[1] = alpha2[1]; | |
7db90f4a | 1744 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; |
fe33eb39 LR |
1745 | request->country_ie_env = env; |
1746 | ||
abc7381b | 1747 | mutex_unlock(®_mutex); |
3f2355cb | 1748 | |
fe33eb39 LR |
1749 | queue_regulatory_request(request); |
1750 | ||
1751 | return; | |
0441d6ff | 1752 | |
3f2355cb | 1753 | out: |
abc7381b | 1754 | mutex_unlock(®_mutex); |
3f2355cb | 1755 | } |
b2e1b302 | 1756 | |
09d989d1 LR |
1757 | static void restore_alpha2(char *alpha2, bool reset_user) |
1758 | { | |
1759 | /* indicates there is no alpha2 to consider for restoration */ | |
1760 | alpha2[0] = '9'; | |
1761 | alpha2[1] = '7'; | |
1762 | ||
1763 | /* The user setting has precedence over the module parameter */ | |
1764 | if (is_user_regdom_saved()) { | |
1765 | /* Unless we're asked to ignore it and reset it */ | |
1766 | if (reset_user) { | |
d91e41b6 | 1767 | REG_DBG_PRINT("Restoring regulatory settings " |
09d989d1 LR |
1768 | "including user preference\n"); |
1769 | user_alpha2[0] = '9'; | |
1770 | user_alpha2[1] = '7'; | |
1771 | ||
1772 | /* | |
1773 | * If we're ignoring user settings, we still need to | |
1774 | * check the module parameter to ensure we put things | |
1775 | * back as they were for a full restore. | |
1776 | */ | |
1777 | if (!is_world_regdom(ieee80211_regdom)) { | |
d91e41b6 | 1778 | REG_DBG_PRINT("Keeping preference on " |
09d989d1 LR |
1779 | "module parameter ieee80211_regdom: %c%c\n", |
1780 | ieee80211_regdom[0], | |
1781 | ieee80211_regdom[1]); | |
1782 | alpha2[0] = ieee80211_regdom[0]; | |
1783 | alpha2[1] = ieee80211_regdom[1]; | |
1784 | } | |
1785 | } else { | |
d91e41b6 | 1786 | REG_DBG_PRINT("Restoring regulatory settings " |
09d989d1 LR |
1787 | "while preserving user preference for: %c%c\n", |
1788 | user_alpha2[0], | |
1789 | user_alpha2[1]); | |
1790 | alpha2[0] = user_alpha2[0]; | |
1791 | alpha2[1] = user_alpha2[1]; | |
1792 | } | |
1793 | } else if (!is_world_regdom(ieee80211_regdom)) { | |
d91e41b6 | 1794 | REG_DBG_PRINT("Keeping preference on " |
09d989d1 LR |
1795 | "module parameter ieee80211_regdom: %c%c\n", |
1796 | ieee80211_regdom[0], | |
1797 | ieee80211_regdom[1]); | |
1798 | alpha2[0] = ieee80211_regdom[0]; | |
1799 | alpha2[1] = ieee80211_regdom[1]; | |
1800 | } else | |
d91e41b6 | 1801 | REG_DBG_PRINT("Restoring regulatory settings\n"); |
09d989d1 LR |
1802 | } |
1803 | ||
5ce543d1 RM |
1804 | static void restore_custom_reg_settings(struct wiphy *wiphy) |
1805 | { | |
1806 | struct ieee80211_supported_band *sband; | |
1807 | enum ieee80211_band band; | |
1808 | struct ieee80211_channel *chan; | |
1809 | int i; | |
1810 | ||
1811 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1812 | sband = wiphy->bands[band]; | |
1813 | if (!sband) | |
1814 | continue; | |
1815 | for (i = 0; i < sband->n_channels; i++) { | |
1816 | chan = &sband->channels[i]; | |
1817 | chan->flags = chan->orig_flags; | |
1818 | chan->max_antenna_gain = chan->orig_mag; | |
1819 | chan->max_power = chan->orig_mpwr; | |
1820 | } | |
1821 | } | |
1822 | } | |
1823 | ||
09d989d1 LR |
1824 | /* |
1825 | * Restoring regulatory settings involves ingoring any | |
1826 | * possibly stale country IE information and user regulatory | |
1827 | * settings if so desired, this includes any beacon hints | |
1828 | * learned as we could have traveled outside to another country | |
1829 | * after disconnection. To restore regulatory settings we do | |
1830 | * exactly what we did at bootup: | |
1831 | * | |
1832 | * - send a core regulatory hint | |
1833 | * - send a user regulatory hint if applicable | |
1834 | * | |
1835 | * Device drivers that send a regulatory hint for a specific country | |
1836 | * keep their own regulatory domain on wiphy->regd so that does does | |
1837 | * not need to be remembered. | |
1838 | */ | |
1839 | static void restore_regulatory_settings(bool reset_user) | |
1840 | { | |
1841 | char alpha2[2]; | |
cee0bec5 | 1842 | char world_alpha2[2]; |
09d989d1 | 1843 | struct reg_beacon *reg_beacon, *btmp; |
14609555 LR |
1844 | struct regulatory_request *reg_request, *tmp; |
1845 | LIST_HEAD(tmp_reg_req_list); | |
5ce543d1 | 1846 | struct cfg80211_registered_device *rdev; |
09d989d1 LR |
1847 | |
1848 | mutex_lock(&cfg80211_mutex); | |
1849 | mutex_lock(®_mutex); | |
1850 | ||
a042994d | 1851 | reset_regdomains(true); |
09d989d1 LR |
1852 | restore_alpha2(alpha2, reset_user); |
1853 | ||
14609555 LR |
1854 | /* |
1855 | * If there's any pending requests we simply | |
1856 | * stash them to a temporary pending queue and | |
1857 | * add then after we've restored regulatory | |
1858 | * settings. | |
1859 | */ | |
1860 | spin_lock(®_requests_lock); | |
1861 | if (!list_empty(®_requests_list)) { | |
1862 | list_for_each_entry_safe(reg_request, tmp, | |
1863 | ®_requests_list, list) { | |
1864 | if (reg_request->initiator != | |
1865 | NL80211_REGDOM_SET_BY_USER) | |
1866 | continue; | |
1867 | list_del(®_request->list); | |
1868 | list_add_tail(®_request->list, &tmp_reg_req_list); | |
1869 | } | |
1870 | } | |
1871 | spin_unlock(®_requests_lock); | |
1872 | ||
09d989d1 LR |
1873 | /* Clear beacon hints */ |
1874 | spin_lock_bh(®_pending_beacons_lock); | |
1875 | if (!list_empty(®_pending_beacons)) { | |
1876 | list_for_each_entry_safe(reg_beacon, btmp, | |
1877 | ®_pending_beacons, list) { | |
1878 | list_del(®_beacon->list); | |
1879 | kfree(reg_beacon); | |
1880 | } | |
1881 | } | |
1882 | spin_unlock_bh(®_pending_beacons_lock); | |
1883 | ||
1884 | if (!list_empty(®_beacon_list)) { | |
1885 | list_for_each_entry_safe(reg_beacon, btmp, | |
1886 | ®_beacon_list, list) { | |
1887 | list_del(®_beacon->list); | |
1888 | kfree(reg_beacon); | |
1889 | } | |
1890 | } | |
1891 | ||
1892 | /* First restore to the basic regulatory settings */ | |
1893 | cfg80211_regdomain = cfg80211_world_regdom; | |
cee0bec5 DS |
1894 | world_alpha2[0] = cfg80211_regdomain->alpha2[0]; |
1895 | world_alpha2[1] = cfg80211_regdomain->alpha2[1]; | |
09d989d1 | 1896 | |
5ce543d1 RM |
1897 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { |
1898 | if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY) | |
1899 | restore_custom_reg_settings(&rdev->wiphy); | |
1900 | } | |
1901 | ||
09d989d1 LR |
1902 | mutex_unlock(®_mutex); |
1903 | mutex_unlock(&cfg80211_mutex); | |
1904 | ||
cee0bec5 | 1905 | regulatory_hint_core(world_alpha2); |
09d989d1 LR |
1906 | |
1907 | /* | |
1908 | * This restores the ieee80211_regdom module parameter | |
1909 | * preference or the last user requested regulatory | |
1910 | * settings, user regulatory settings takes precedence. | |
1911 | */ | |
1912 | if (is_an_alpha2(alpha2)) | |
1913 | regulatory_hint_user(user_alpha2); | |
09d989d1 | 1914 | |
14609555 LR |
1915 | if (list_empty(&tmp_reg_req_list)) |
1916 | return; | |
1917 | ||
1918 | mutex_lock(&cfg80211_mutex); | |
1919 | mutex_lock(®_mutex); | |
1920 | ||
1921 | spin_lock(®_requests_lock); | |
1922 | list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) { | |
1923 | REG_DBG_PRINT("Adding request for country %c%c back " | |
1924 | "into the queue\n", | |
1925 | reg_request->alpha2[0], | |
1926 | reg_request->alpha2[1]); | |
1927 | list_del(®_request->list); | |
1928 | list_add_tail(®_request->list, ®_requests_list); | |
1929 | } | |
1930 | spin_unlock(®_requests_lock); | |
1931 | ||
1932 | mutex_unlock(®_mutex); | |
1933 | mutex_unlock(&cfg80211_mutex); | |
1934 | ||
1935 | REG_DBG_PRINT("Kicking the queue\n"); | |
1936 | ||
1937 | schedule_work(®_work); | |
1938 | } | |
09d989d1 LR |
1939 | |
1940 | void regulatory_hint_disconnect(void) | |
1941 | { | |
d91e41b6 | 1942 | REG_DBG_PRINT("All devices are disconnected, going to " |
09d989d1 LR |
1943 | "restore regulatory settings\n"); |
1944 | restore_regulatory_settings(false); | |
1945 | } | |
1946 | ||
e38f8a7a LR |
1947 | static bool freq_is_chan_12_13_14(u16 freq) |
1948 | { | |
59eb21a6 BR |
1949 | if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) || |
1950 | freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) || | |
1951 | freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ)) | |
e38f8a7a LR |
1952 | return true; |
1953 | return false; | |
1954 | } | |
1955 | ||
1956 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
1957 | struct ieee80211_channel *beacon_chan, | |
1958 | gfp_t gfp) | |
1959 | { | |
1960 | struct reg_beacon *reg_beacon; | |
1961 | ||
1962 | if (likely((beacon_chan->beacon_found || | |
1963 | (beacon_chan->flags & IEEE80211_CHAN_RADAR) || | |
1964 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
1965 | !freq_is_chan_12_13_14(beacon_chan->center_freq))))) | |
1966 | return 0; | |
1967 | ||
1968 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
1969 | if (!reg_beacon) | |
1970 | return -ENOMEM; | |
1971 | ||
d91e41b6 | 1972 | REG_DBG_PRINT("Found new beacon on " |
4113f751 LR |
1973 | "frequency: %d MHz (Ch %d) on %s\n", |
1974 | beacon_chan->center_freq, | |
1975 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
1976 | wiphy_name(wiphy)); | |
1977 | ||
e38f8a7a LR |
1978 | memcpy(®_beacon->chan, beacon_chan, |
1979 | sizeof(struct ieee80211_channel)); | |
1980 | ||
1981 | ||
1982 | /* | |
1983 | * Since we can be called from BH or and non-BH context | |
1984 | * we must use spin_lock_bh() | |
1985 | */ | |
1986 | spin_lock_bh(®_pending_beacons_lock); | |
1987 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
1988 | spin_unlock_bh(®_pending_beacons_lock); | |
1989 | ||
1990 | schedule_work(®_work); | |
1991 | ||
1992 | return 0; | |
1993 | } | |
1994 | ||
a3d2eaf0 | 1995 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1996 | { |
1997 | unsigned int i; | |
a3d2eaf0 JB |
1998 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1999 | const struct ieee80211_freq_range *freq_range = NULL; | |
2000 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 | 2001 | |
6653325a | 2002 | pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n"); |
b2e1b302 LR |
2003 | |
2004 | for (i = 0; i < rd->n_reg_rules; i++) { | |
2005 | reg_rule = &rd->reg_rules[i]; | |
2006 | freq_range = ®_rule->freq_range; | |
2007 | power_rule = ®_rule->power_rule; | |
2008 | ||
fb1fc7ad LR |
2009 | /* |
2010 | * There may not be documentation for max antenna gain | |
2011 | * in certain regions | |
2012 | */ | |
b2e1b302 | 2013 | if (power_rule->max_antenna_gain) |
6653325a | 2014 | pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n", |
b2e1b302 LR |
2015 | freq_range->start_freq_khz, |
2016 | freq_range->end_freq_khz, | |
2017 | freq_range->max_bandwidth_khz, | |
2018 | power_rule->max_antenna_gain, | |
2019 | power_rule->max_eirp); | |
2020 | else | |
6653325a | 2021 | pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n", |
b2e1b302 LR |
2022 | freq_range->start_freq_khz, |
2023 | freq_range->end_freq_khz, | |
2024 | freq_range->max_bandwidth_khz, | |
2025 | power_rule->max_eirp); | |
2026 | } | |
2027 | } | |
2028 | ||
8b60b078 LR |
2029 | bool reg_supported_dfs_region(u8 dfs_region) |
2030 | { | |
2031 | switch (dfs_region) { | |
2032 | case NL80211_DFS_UNSET: | |
2033 | case NL80211_DFS_FCC: | |
2034 | case NL80211_DFS_ETSI: | |
2035 | case NL80211_DFS_JP: | |
2036 | return true; | |
2037 | default: | |
2038 | REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n", | |
2039 | dfs_region); | |
2040 | return false; | |
2041 | } | |
2042 | } | |
2043 | ||
2044 | static void print_dfs_region(u8 dfs_region) | |
2045 | { | |
2046 | if (!dfs_region) | |
2047 | return; | |
2048 | ||
2049 | switch (dfs_region) { | |
2050 | case NL80211_DFS_FCC: | |
2051 | pr_info(" DFS Master region FCC"); | |
2052 | break; | |
2053 | case NL80211_DFS_ETSI: | |
2054 | pr_info(" DFS Master region ETSI"); | |
2055 | break; | |
2056 | case NL80211_DFS_JP: | |
2057 | pr_info(" DFS Master region JP"); | |
2058 | break; | |
2059 | default: | |
2060 | pr_info(" DFS Master region Uknown"); | |
2061 | break; | |
2062 | } | |
2063 | } | |
2064 | ||
a3d2eaf0 | 2065 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
2066 | { |
2067 | ||
3f2355cb | 2068 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb | 2069 | |
7db90f4a LR |
2070 | if (last_request->initiator == |
2071 | NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
79c97e97 JB |
2072 | struct cfg80211_registered_device *rdev; |
2073 | rdev = cfg80211_rdev_by_wiphy_idx( | |
806a9e39 | 2074 | last_request->wiphy_idx); |
79c97e97 | 2075 | if (rdev) { |
e9c0268f | 2076 | pr_info("Current regulatory domain updated by AP to: %c%c\n", |
79c97e97 JB |
2077 | rdev->country_ie_alpha2[0], |
2078 | rdev->country_ie_alpha2[1]); | |
3f2355cb | 2079 | } else |
e9c0268f | 2080 | pr_info("Current regulatory domain intersected:\n"); |
3f2355cb | 2081 | } else |
e9c0268f | 2082 | pr_info("Current regulatory domain intersected:\n"); |
3f2355cb | 2083 | } else if (is_world_regdom(rd->alpha2)) |
e9c0268f | 2084 | pr_info("World regulatory domain updated:\n"); |
b2e1b302 LR |
2085 | else { |
2086 | if (is_unknown_alpha2(rd->alpha2)) | |
e9c0268f | 2087 | pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n"); |
b2e1b302 | 2088 | else |
e9c0268f | 2089 | pr_info("Regulatory domain changed to country: %c%c\n", |
b2e1b302 LR |
2090 | rd->alpha2[0], rd->alpha2[1]); |
2091 | } | |
8b60b078 | 2092 | print_dfs_region(rd->dfs_region); |
b2e1b302 LR |
2093 | print_rd_rules(rd); |
2094 | } | |
2095 | ||
2df78167 | 2096 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2097 | { |
e9c0268f | 2098 | pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]); |
b2e1b302 LR |
2099 | print_rd_rules(rd); |
2100 | } | |
2101 | ||
d2372b31 | 2102 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 2103 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2104 | { |
9c96477d | 2105 | const struct ieee80211_regdomain *intersected_rd = NULL; |
79c97e97 | 2106 | struct cfg80211_registered_device *rdev = NULL; |
806a9e39 | 2107 | struct wiphy *request_wiphy; |
b2e1b302 LR |
2108 | /* Some basic sanity checks first */ |
2109 | ||
b2e1b302 | 2110 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 2111 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2112 | return -EINVAL; |
2113 | update_world_regdomain(rd); | |
2114 | return 0; | |
2115 | } | |
b2e1b302 LR |
2116 | |
2117 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
2118 | !is_unknown_alpha2(rd->alpha2)) | |
2119 | return -EINVAL; | |
2120 | ||
f6037d09 | 2121 | if (!last_request) |
b2e1b302 LR |
2122 | return -EINVAL; |
2123 | ||
fb1fc7ad LR |
2124 | /* |
2125 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 2126 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
2127 | * and the pending request came in from a country IE |
2128 | */ | |
7db90f4a | 2129 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
2130 | /* |
2131 | * If someone else asked us to change the rd lets only bother | |
2132 | * checking if the alpha2 changes if CRDA was already called | |
2133 | */ | |
baeb66fe | 2134 | if (!regdom_changes(rd->alpha2)) |
3f2355cb LR |
2135 | return -EINVAL; |
2136 | } | |
2137 | ||
fb1fc7ad LR |
2138 | /* |
2139 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
2140 | * and finally inform them of what we have done, in case they want |
2141 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
2142 | * internal EEPROM data |
2143 | */ | |
b2e1b302 | 2144 | |
f6037d09 | 2145 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
2146 | return -EINVAL; |
2147 | ||
8375af3b | 2148 | if (!is_valid_rd(rd)) { |
e9c0268f | 2149 | pr_err("Invalid regulatory domain detected:\n"); |
8375af3b LR |
2150 | print_regdomain_info(rd); |
2151 | return -EINVAL; | |
b2e1b302 LR |
2152 | } |
2153 | ||
806a9e39 | 2154 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
0bac71af LR |
2155 | if (!request_wiphy && |
2156 | (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
2157 | last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) { | |
2158 | schedule_delayed_work(®_timeout, 0); | |
de3584bd JB |
2159 | return -ENODEV; |
2160 | } | |
806a9e39 | 2161 | |
b8295acd | 2162 | if (!last_request->intersect) { |
3e0c3ff3 LR |
2163 | int r; |
2164 | ||
7db90f4a | 2165 | if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { |
a042994d | 2166 | reset_regdomains(false); |
3e0c3ff3 LR |
2167 | cfg80211_regdomain = rd; |
2168 | return 0; | |
2169 | } | |
2170 | ||
fb1fc7ad LR |
2171 | /* |
2172 | * For a driver hint, lets copy the regulatory domain the | |
2173 | * driver wanted to the wiphy to deal with conflicts | |
2174 | */ | |
3e0c3ff3 | 2175 | |
558f6d32 LR |
2176 | /* |
2177 | * Userspace could have sent two replies with only | |
2178 | * one kernel request. | |
2179 | */ | |
2180 | if (request_wiphy->regd) | |
2181 | return -EALREADY; | |
3e0c3ff3 | 2182 | |
806a9e39 | 2183 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
2184 | if (r) |
2185 | return r; | |
2186 | ||
a042994d | 2187 | reset_regdomains(false); |
b8295acd LR |
2188 | cfg80211_regdomain = rd; |
2189 | return 0; | |
2190 | } | |
2191 | ||
2192 | /* Intersection requires a bit more work */ | |
2193 | ||
7db90f4a | 2194 | if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { |
b8295acd | 2195 | |
9c96477d LR |
2196 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
2197 | if (!intersected_rd) | |
2198 | return -EINVAL; | |
b8295acd | 2199 | |
fb1fc7ad LR |
2200 | /* |
2201 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 2202 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
2203 | * domain we keep it for its private use |
2204 | */ | |
7db90f4a | 2205 | if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) |
806a9e39 | 2206 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
2207 | else |
2208 | kfree(rd); | |
2209 | ||
b8295acd LR |
2210 | rd = NULL; |
2211 | ||
a042994d | 2212 | reset_regdomains(false); |
b8295acd LR |
2213 | cfg80211_regdomain = intersected_rd; |
2214 | ||
2215 | return 0; | |
9c96477d LR |
2216 | } |
2217 | ||
3f2355cb LR |
2218 | if (!intersected_rd) |
2219 | return -EINVAL; | |
2220 | ||
79c97e97 | 2221 | rdev = wiphy_to_dev(request_wiphy); |
3f2355cb | 2222 | |
79c97e97 JB |
2223 | rdev->country_ie_alpha2[0] = rd->alpha2[0]; |
2224 | rdev->country_ie_alpha2[1] = rd->alpha2[1]; | |
2225 | rdev->env = last_request->country_ie_env; | |
3f2355cb LR |
2226 | |
2227 | BUG_ON(intersected_rd == rd); | |
2228 | ||
2229 | kfree(rd); | |
2230 | rd = NULL; | |
2231 | ||
a042994d | 2232 | reset_regdomains(false); |
3f2355cb | 2233 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
2234 | |
2235 | return 0; | |
2236 | } | |
2237 | ||
2238 | ||
fb1fc7ad LR |
2239 | /* |
2240 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 2241 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
2242 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
2243 | */ | |
a3d2eaf0 | 2244 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 2245 | { |
b2e1b302 LR |
2246 | int r; |
2247 | ||
761cf7ec LR |
2248 | assert_cfg80211_lock(); |
2249 | ||
abc7381b LR |
2250 | mutex_lock(®_mutex); |
2251 | ||
b2e1b302 LR |
2252 | /* Note that this doesn't update the wiphys, this is done below */ |
2253 | r = __set_regdom(rd); | |
d2372b31 JB |
2254 | if (r) { |
2255 | kfree(rd); | |
abc7381b | 2256 | mutex_unlock(®_mutex); |
b2e1b302 | 2257 | return r; |
d2372b31 | 2258 | } |
b2e1b302 | 2259 | |
b2e1b302 | 2260 | /* This would make this whole thing pointless */ |
a01ddafd LR |
2261 | if (!last_request->intersect) |
2262 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
2263 | |
2264 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 2265 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 2266 | |
a01ddafd | 2267 | print_regdomain(cfg80211_regdomain); |
b2e1b302 | 2268 | |
73d54c9e LR |
2269 | nl80211_send_reg_change_event(last_request); |
2270 | ||
b2e253cf LR |
2271 | reg_set_request_processed(); |
2272 | ||
abc7381b LR |
2273 | mutex_unlock(®_mutex); |
2274 | ||
b2e1b302 LR |
2275 | return r; |
2276 | } | |
2277 | ||
4d9d88d1 SJR |
2278 | #ifdef CONFIG_HOTPLUG |
2279 | int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
2280 | { | |
2281 | if (last_request && !last_request->processed) { | |
2282 | if (add_uevent_var(env, "COUNTRY=%c%c", | |
2283 | last_request->alpha2[0], | |
2284 | last_request->alpha2[1])) | |
2285 | return -ENOMEM; | |
2286 | } | |
2287 | ||
2288 | return 0; | |
2289 | } | |
2290 | #else | |
2291 | int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
2292 | { | |
2293 | return -ENODEV; | |
2294 | } | |
2295 | #endif /* CONFIG_HOTPLUG */ | |
2296 | ||
a1794390 | 2297 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
2298 | void reg_device_remove(struct wiphy *wiphy) |
2299 | { | |
0ad8acaf | 2300 | struct wiphy *request_wiphy = NULL; |
806a9e39 | 2301 | |
761cf7ec LR |
2302 | assert_cfg80211_lock(); |
2303 | ||
abc7381b LR |
2304 | mutex_lock(®_mutex); |
2305 | ||
0ef9ccdd CW |
2306 | kfree(wiphy->regd); |
2307 | ||
0ad8acaf LR |
2308 | if (last_request) |
2309 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
806a9e39 | 2310 | |
0ef9ccdd | 2311 | if (!request_wiphy || request_wiphy != wiphy) |
abc7381b | 2312 | goto out; |
0ef9ccdd | 2313 | |
806a9e39 | 2314 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb | 2315 | last_request->country_ie_env = ENVIRON_ANY; |
abc7381b LR |
2316 | out: |
2317 | mutex_unlock(®_mutex); | |
3f2355cb LR |
2318 | } |
2319 | ||
a90c7a31 LR |
2320 | static void reg_timeout_work(struct work_struct *work) |
2321 | { | |
2322 | REG_DBG_PRINT("Timeout while waiting for CRDA to reply, " | |
12c5ffb5 | 2323 | "restoring regulatory settings\n"); |
a90c7a31 LR |
2324 | restore_regulatory_settings(true); |
2325 | } | |
2326 | ||
2fcc9f73 | 2327 | int __init regulatory_init(void) |
b2e1b302 | 2328 | { |
bcf4f99b | 2329 | int err = 0; |
734366de | 2330 | |
b2e1b302 LR |
2331 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
2332 | if (IS_ERR(reg_pdev)) | |
2333 | return PTR_ERR(reg_pdev); | |
734366de | 2334 | |
4d9d88d1 SJR |
2335 | reg_pdev->dev.type = ®_device_type; |
2336 | ||
fe33eb39 | 2337 | spin_lock_init(®_requests_lock); |
e38f8a7a | 2338 | spin_lock_init(®_pending_beacons_lock); |
fe33eb39 | 2339 | |
a3d2eaf0 | 2340 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 2341 | |
09d989d1 LR |
2342 | user_alpha2[0] = '9'; |
2343 | user_alpha2[1] = '7'; | |
2344 | ||
ae9e4b0d LR |
2345 | /* We always try to get an update for the static regdomain */ |
2346 | err = regulatory_hint_core(cfg80211_regdomain->alpha2); | |
ba25c141 | 2347 | if (err) { |
bcf4f99b LR |
2348 | if (err == -ENOMEM) |
2349 | return err; | |
2350 | /* | |
2351 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2352 | * memory which is handled and propagated appropriately above | |
2353 | * but it can also fail during a netlink_broadcast() or during | |
2354 | * early boot for call_usermodehelper(). For now treat these | |
2355 | * errors as non-fatal. | |
2356 | */ | |
e9c0268f | 2357 | pr_err("kobject_uevent_env() was unable to call CRDA during init\n"); |
bcf4f99b LR |
2358 | #ifdef CONFIG_CFG80211_REG_DEBUG |
2359 | /* We want to find out exactly why when debugging */ | |
2360 | WARN_ON(err); | |
734366de | 2361 | #endif |
bcf4f99b | 2362 | } |
734366de | 2363 | |
ae9e4b0d LR |
2364 | /* |
2365 | * Finally, if the user set the module parameter treat it | |
2366 | * as a user hint. | |
2367 | */ | |
2368 | if (!is_world_regdom(ieee80211_regdom)) | |
2369 | regulatory_hint_user(ieee80211_regdom); | |
2370 | ||
b2e1b302 LR |
2371 | return 0; |
2372 | } | |
2373 | ||
2fcc9f73 | 2374 | void /* __init_or_exit */ regulatory_exit(void) |
b2e1b302 | 2375 | { |
fe33eb39 | 2376 | struct regulatory_request *reg_request, *tmp; |
e38f8a7a | 2377 | struct reg_beacon *reg_beacon, *btmp; |
fe33eb39 LR |
2378 | |
2379 | cancel_work_sync(®_work); | |
a90c7a31 | 2380 | cancel_delayed_work_sync(®_timeout); |
fe33eb39 | 2381 | |
a1794390 | 2382 | mutex_lock(&cfg80211_mutex); |
abc7381b | 2383 | mutex_lock(®_mutex); |
734366de | 2384 | |
a042994d | 2385 | reset_regdomains(true); |
734366de | 2386 | |
58ebacc6 | 2387 | dev_set_uevent_suppress(®_pdev->dev, true); |
f6037d09 | 2388 | |
b2e1b302 | 2389 | platform_device_unregister(reg_pdev); |
734366de | 2390 | |
e38f8a7a LR |
2391 | spin_lock_bh(®_pending_beacons_lock); |
2392 | if (!list_empty(®_pending_beacons)) { | |
2393 | list_for_each_entry_safe(reg_beacon, btmp, | |
2394 | ®_pending_beacons, list) { | |
2395 | list_del(®_beacon->list); | |
2396 | kfree(reg_beacon); | |
2397 | } | |
2398 | } | |
2399 | spin_unlock_bh(®_pending_beacons_lock); | |
2400 | ||
2401 | if (!list_empty(®_beacon_list)) { | |
2402 | list_for_each_entry_safe(reg_beacon, btmp, | |
2403 | ®_beacon_list, list) { | |
2404 | list_del(®_beacon->list); | |
2405 | kfree(reg_beacon); | |
2406 | } | |
2407 | } | |
2408 | ||
fe33eb39 LR |
2409 | spin_lock(®_requests_lock); |
2410 | if (!list_empty(®_requests_list)) { | |
2411 | list_for_each_entry_safe(reg_request, tmp, | |
2412 | ®_requests_list, list) { | |
2413 | list_del(®_request->list); | |
2414 | kfree(reg_request); | |
2415 | } | |
2416 | } | |
2417 | spin_unlock(®_requests_lock); | |
2418 | ||
abc7381b | 2419 | mutex_unlock(®_mutex); |
a1794390 | 2420 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 2421 | } |