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1 | /* | |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
5 | * Copyright 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com> | |
6 | * Copyright 2013-2014 Intel Mobile Communications GmbH | |
7 | * | |
8 | * Permission to use, copy, modify, and/or distribute this software for any | |
9 | * purpose with or without fee is hereby granted, provided that the above | |
10 | * copyright notice and this permission notice appear in all copies. | |
11 | * | |
12 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
13 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
14 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
15 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
16 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
17 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
18 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
19 | */ | |
20 | ||
21 | ||
22 | /** | |
23 | * DOC: Wireless regulatory infrastructure | |
24 | * | |
25 | * The usual implementation is for a driver to read a device EEPROM to | |
26 | * determine which regulatory domain it should be operating under, then | |
27 | * looking up the allowable channels in a driver-local table and finally | |
28 | * registering those channels in the wiphy structure. | |
29 | * | |
30 | * Another set of compliance enforcement is for drivers to use their | |
31 | * own compliance limits which can be stored on the EEPROM. The host | |
32 | * driver or firmware may ensure these are used. | |
33 | * | |
34 | * In addition to all this we provide an extra layer of regulatory | |
35 | * conformance. For drivers which do not have any regulatory | |
36 | * information CRDA provides the complete regulatory solution. | |
37 | * For others it provides a community effort on further restrictions | |
38 | * to enhance compliance. | |
39 | * | |
40 | * Note: When number of rules --> infinity we will not be able to | |
41 | * index on alpha2 any more, instead we'll probably have to | |
42 | * rely on some SHA1 checksum of the regdomain for example. | |
43 | * | |
44 | */ | |
45 | ||
46 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
47 | ||
48 | #include <linux/kernel.h> | |
49 | #include <linux/export.h> | |
50 | #include <linux/slab.h> | |
51 | #include <linux/list.h> | |
52 | #include <linux/ctype.h> | |
53 | #include <linux/nl80211.h> | |
54 | #include <linux/platform_device.h> | |
55 | #include <linux/moduleparam.h> | |
56 | #include <net/cfg80211.h> | |
57 | #include "core.h" | |
58 | #include "reg.h" | |
59 | #include "rdev-ops.h" | |
60 | #include "regdb.h" | |
61 | #include "nl80211.h" | |
62 | ||
63 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
64 | #define REG_DBG_PRINT(format, args...) \ | |
65 | printk(KERN_DEBUG pr_fmt(format), ##args) | |
66 | #else | |
67 | #define REG_DBG_PRINT(args...) | |
68 | #endif | |
69 | ||
70 | /* | |
71 | * Grace period we give before making sure all current interfaces reside on | |
72 | * channels allowed by the current regulatory domain. | |
73 | */ | |
74 | #define REG_ENFORCE_GRACE_MS 60000 | |
75 | ||
76 | /** | |
77 | * enum reg_request_treatment - regulatory request treatment | |
78 | * | |
79 | * @REG_REQ_OK: continue processing the regulatory request | |
80 | * @REG_REQ_IGNORE: ignore the regulatory request | |
81 | * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should | |
82 | * be intersected with the current one. | |
83 | * @REG_REQ_ALREADY_SET: the regulatory request will not change the current | |
84 | * regulatory settings, and no further processing is required. | |
85 | * @REG_REQ_USER_HINT_HANDLED: a non alpha2 user hint was handled and no | |
86 | * further processing is required, i.e., not need to update last_request | |
87 | * etc. This should be used for user hints that do not provide an alpha2 | |
88 | * but some other type of regulatory hint, i.e., indoor operation. | |
89 | */ | |
90 | enum reg_request_treatment { | |
91 | REG_REQ_OK, | |
92 | REG_REQ_IGNORE, | |
93 | REG_REQ_INTERSECT, | |
94 | REG_REQ_ALREADY_SET, | |
95 | REG_REQ_USER_HINT_HANDLED, | |
96 | }; | |
97 | ||
98 | static struct regulatory_request core_request_world = { | |
99 | .initiator = NL80211_REGDOM_SET_BY_CORE, | |
100 | .alpha2[0] = '0', | |
101 | .alpha2[1] = '0', | |
102 | .intersect = false, | |
103 | .processed = true, | |
104 | .country_ie_env = ENVIRON_ANY, | |
105 | }; | |
106 | ||
107 | /* | |
108 | * Receipt of information from last regulatory request, | |
109 | * protected by RTNL (and can be accessed with RCU protection) | |
110 | */ | |
111 | static struct regulatory_request __rcu *last_request = | |
112 | (void __rcu *)&core_request_world; | |
113 | ||
114 | /* To trigger userspace events */ | |
115 | static struct platform_device *reg_pdev; | |
116 | ||
117 | /* | |
118 | * Central wireless core regulatory domains, we only need two, | |
119 | * the current one and a world regulatory domain in case we have no | |
120 | * information to give us an alpha2. | |
121 | * (protected by RTNL, can be read under RCU) | |
122 | */ | |
123 | const struct ieee80211_regdomain __rcu *cfg80211_regdomain; | |
124 | ||
125 | /* | |
126 | * Number of devices that registered to the core | |
127 | * that support cellular base station regulatory hints | |
128 | * (protected by RTNL) | |
129 | */ | |
130 | static int reg_num_devs_support_basehint; | |
131 | ||
132 | /* | |
133 | * State variable indicating if the platform on which the devices | |
134 | * are attached is operating in an indoor environment. The state variable | |
135 | * is relevant for all registered devices. | |
136 | * (protected by RTNL) | |
137 | */ | |
138 | static bool reg_is_indoor; | |
139 | ||
140 | static const struct ieee80211_regdomain *get_cfg80211_regdom(void) | |
141 | { | |
142 | return rtnl_dereference(cfg80211_regdomain); | |
143 | } | |
144 | ||
145 | static const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy) | |
146 | { | |
147 | return rtnl_dereference(wiphy->regd); | |
148 | } | |
149 | ||
150 | static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region) | |
151 | { | |
152 | switch (dfs_region) { | |
153 | case NL80211_DFS_UNSET: | |
154 | return "unset"; | |
155 | case NL80211_DFS_FCC: | |
156 | return "FCC"; | |
157 | case NL80211_DFS_ETSI: | |
158 | return "ETSI"; | |
159 | case NL80211_DFS_JP: | |
160 | return "JP"; | |
161 | } | |
162 | return "Unknown"; | |
163 | } | |
164 | ||
165 | enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy) | |
166 | { | |
167 | const struct ieee80211_regdomain *regd = NULL; | |
168 | const struct ieee80211_regdomain *wiphy_regd = NULL; | |
169 | ||
170 | regd = get_cfg80211_regdom(); | |
171 | if (!wiphy) | |
172 | goto out; | |
173 | ||
174 | wiphy_regd = get_wiphy_regdom(wiphy); | |
175 | if (!wiphy_regd) | |
176 | goto out; | |
177 | ||
178 | if (wiphy_regd->dfs_region == regd->dfs_region) | |
179 | goto out; | |
180 | ||
181 | REG_DBG_PRINT("%s: device specific dfs_region " | |
182 | "(%s) disagrees with cfg80211's " | |
183 | "central dfs_region (%s)\n", | |
184 | dev_name(&wiphy->dev), | |
185 | reg_dfs_region_str(wiphy_regd->dfs_region), | |
186 | reg_dfs_region_str(regd->dfs_region)); | |
187 | ||
188 | out: | |
189 | return regd->dfs_region; | |
190 | } | |
191 | ||
192 | static void rcu_free_regdom(const struct ieee80211_regdomain *r) | |
193 | { | |
194 | if (!r) | |
195 | return; | |
196 | kfree_rcu((struct ieee80211_regdomain *)r, rcu_head); | |
197 | } | |
198 | ||
199 | static struct regulatory_request *get_last_request(void) | |
200 | { | |
201 | return rcu_dereference_rtnl(last_request); | |
202 | } | |
203 | ||
204 | /* Used to queue up regulatory hints */ | |
205 | static LIST_HEAD(reg_requests_list); | |
206 | static spinlock_t reg_requests_lock; | |
207 | ||
208 | /* Used to queue up beacon hints for review */ | |
209 | static LIST_HEAD(reg_pending_beacons); | |
210 | static spinlock_t reg_pending_beacons_lock; | |
211 | ||
212 | /* Used to keep track of processed beacon hints */ | |
213 | static LIST_HEAD(reg_beacon_list); | |
214 | ||
215 | struct reg_beacon { | |
216 | struct list_head list; | |
217 | struct ieee80211_channel chan; | |
218 | }; | |
219 | ||
220 | static void reg_check_chans_work(struct work_struct *work); | |
221 | static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work); | |
222 | ||
223 | static void reg_todo(struct work_struct *work); | |
224 | static DECLARE_WORK(reg_work, reg_todo); | |
225 | ||
226 | static void reg_timeout_work(struct work_struct *work); | |
227 | static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work); | |
228 | ||
229 | /* We keep a static world regulatory domain in case of the absence of CRDA */ | |
230 | static const struct ieee80211_regdomain world_regdom = { | |
231 | .n_reg_rules = 6, | |
232 | .alpha2 = "00", | |
233 | .reg_rules = { | |
234 | /* IEEE 802.11b/g, channels 1..11 */ | |
235 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
236 | /* IEEE 802.11b/g, channels 12..13. */ | |
237 | REG_RULE(2467-10, 2472+10, 40, 6, 20, | |
238 | NL80211_RRF_NO_IR), | |
239 | /* IEEE 802.11 channel 14 - Only JP enables | |
240 | * this and for 802.11b only */ | |
241 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
242 | NL80211_RRF_NO_IR | | |
243 | NL80211_RRF_NO_OFDM), | |
244 | /* IEEE 802.11a, channel 36..48 */ | |
245 | REG_RULE(5180-10, 5240+10, 160, 6, 20, | |
246 | NL80211_RRF_NO_IR), | |
247 | ||
248 | /* IEEE 802.11a, channel 52..64 - DFS required */ | |
249 | REG_RULE(5260-10, 5320+10, 160, 6, 20, | |
250 | NL80211_RRF_NO_IR | | |
251 | NL80211_RRF_DFS), | |
252 | ||
253 | /* IEEE 802.11a, channel 100..144 - DFS required */ | |
254 | REG_RULE(5500-10, 5720+10, 160, 6, 20, | |
255 | NL80211_RRF_NO_IR | | |
256 | NL80211_RRF_DFS), | |
257 | ||
258 | /* IEEE 802.11a, channel 149..165 */ | |
259 | REG_RULE(5745-10, 5825+10, 80, 6, 20, | |
260 | NL80211_RRF_NO_IR), | |
261 | ||
262 | /* IEEE 802.11ad (60gHz), channels 1..3 */ | |
263 | REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0), | |
264 | } | |
265 | }; | |
266 | ||
267 | /* protected by RTNL */ | |
268 | static const struct ieee80211_regdomain *cfg80211_world_regdom = | |
269 | &world_regdom; | |
270 | ||
271 | static char *ieee80211_regdom = "00"; | |
272 | static char user_alpha2[2]; | |
273 | ||
274 | module_param(ieee80211_regdom, charp, 0444); | |
275 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
276 | ||
277 | static void reg_free_request(struct regulatory_request *request) | |
278 | { | |
279 | if (request != get_last_request()) | |
280 | kfree(request); | |
281 | } | |
282 | ||
283 | static void reg_free_last_request(void) | |
284 | { | |
285 | struct regulatory_request *lr = get_last_request(); | |
286 | ||
287 | if (lr != &core_request_world && lr) | |
288 | kfree_rcu(lr, rcu_head); | |
289 | } | |
290 | ||
291 | static void reg_update_last_request(struct regulatory_request *request) | |
292 | { | |
293 | struct regulatory_request *lr; | |
294 | ||
295 | lr = get_last_request(); | |
296 | if (lr == request) | |
297 | return; | |
298 | ||
299 | reg_free_last_request(); | |
300 | rcu_assign_pointer(last_request, request); | |
301 | } | |
302 | ||
303 | static void reset_regdomains(bool full_reset, | |
304 | const struct ieee80211_regdomain *new_regdom) | |
305 | { | |
306 | const struct ieee80211_regdomain *r; | |
307 | ||
308 | ASSERT_RTNL(); | |
309 | ||
310 | r = get_cfg80211_regdom(); | |
311 | ||
312 | /* avoid freeing static information or freeing something twice */ | |
313 | if (r == cfg80211_world_regdom) | |
314 | r = NULL; | |
315 | if (cfg80211_world_regdom == &world_regdom) | |
316 | cfg80211_world_regdom = NULL; | |
317 | if (r == &world_regdom) | |
318 | r = NULL; | |
319 | ||
320 | rcu_free_regdom(r); | |
321 | rcu_free_regdom(cfg80211_world_regdom); | |
322 | ||
323 | cfg80211_world_regdom = &world_regdom; | |
324 | rcu_assign_pointer(cfg80211_regdomain, new_regdom); | |
325 | ||
326 | if (!full_reset) | |
327 | return; | |
328 | ||
329 | reg_update_last_request(&core_request_world); | |
330 | } | |
331 | ||
332 | /* | |
333 | * Dynamic world regulatory domain requested by the wireless | |
334 | * core upon initialization | |
335 | */ | |
336 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) | |
337 | { | |
338 | struct regulatory_request *lr; | |
339 | ||
340 | lr = get_last_request(); | |
341 | ||
342 | WARN_ON(!lr); | |
343 | ||
344 | reset_regdomains(false, rd); | |
345 | ||
346 | cfg80211_world_regdom = rd; | |
347 | } | |
348 | ||
349 | bool is_world_regdom(const char *alpha2) | |
350 | { | |
351 | if (!alpha2) | |
352 | return false; | |
353 | return alpha2[0] == '0' && alpha2[1] == '0'; | |
354 | } | |
355 | ||
356 | static bool is_alpha2_set(const char *alpha2) | |
357 | { | |
358 | if (!alpha2) | |
359 | return false; | |
360 | return alpha2[0] && alpha2[1]; | |
361 | } | |
362 | ||
363 | static bool is_unknown_alpha2(const char *alpha2) | |
364 | { | |
365 | if (!alpha2) | |
366 | return false; | |
367 | /* | |
368 | * Special case where regulatory domain was built by driver | |
369 | * but a specific alpha2 cannot be determined | |
370 | */ | |
371 | return alpha2[0] == '9' && alpha2[1] == '9'; | |
372 | } | |
373 | ||
374 | static bool is_intersected_alpha2(const char *alpha2) | |
375 | { | |
376 | if (!alpha2) | |
377 | return false; | |
378 | /* | |
379 | * Special case where regulatory domain is the | |
380 | * result of an intersection between two regulatory domain | |
381 | * structures | |
382 | */ | |
383 | return alpha2[0] == '9' && alpha2[1] == '8'; | |
384 | } | |
385 | ||
386 | static bool is_an_alpha2(const char *alpha2) | |
387 | { | |
388 | if (!alpha2) | |
389 | return false; | |
390 | return isalpha(alpha2[0]) && isalpha(alpha2[1]); | |
391 | } | |
392 | ||
393 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) | |
394 | { | |
395 | if (!alpha2_x || !alpha2_y) | |
396 | return false; | |
397 | return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1]; | |
398 | } | |
399 | ||
400 | static bool regdom_changes(const char *alpha2) | |
401 | { | |
402 | const struct ieee80211_regdomain *r = get_cfg80211_regdom(); | |
403 | ||
404 | if (!r) | |
405 | return true; | |
406 | return !alpha2_equal(r->alpha2, alpha2); | |
407 | } | |
408 | ||
409 | /* | |
410 | * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets | |
411 | * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER | |
412 | * has ever been issued. | |
413 | */ | |
414 | static bool is_user_regdom_saved(void) | |
415 | { | |
416 | if (user_alpha2[0] == '9' && user_alpha2[1] == '7') | |
417 | return false; | |
418 | ||
419 | /* This would indicate a mistake on the design */ | |
420 | if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2), | |
421 | "Unexpected user alpha2: %c%c\n", | |
422 | user_alpha2[0], user_alpha2[1])) | |
423 | return false; | |
424 | ||
425 | return true; | |
426 | } | |
427 | ||
428 | static const struct ieee80211_regdomain * | |
429 | reg_copy_regd(const struct ieee80211_regdomain *src_regd) | |
430 | { | |
431 | struct ieee80211_regdomain *regd; | |
432 | int size_of_regd; | |
433 | unsigned int i; | |
434 | ||
435 | size_of_regd = | |
436 | sizeof(struct ieee80211_regdomain) + | |
437 | src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule); | |
438 | ||
439 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
440 | if (!regd) | |
441 | return ERR_PTR(-ENOMEM); | |
442 | ||
443 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
444 | ||
445 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
446 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
447 | sizeof(struct ieee80211_reg_rule)); | |
448 | ||
449 | return regd; | |
450 | } | |
451 | ||
452 | #ifdef CONFIG_CFG80211_INTERNAL_REGDB | |
453 | struct reg_regdb_search_request { | |
454 | char alpha2[2]; | |
455 | struct list_head list; | |
456 | }; | |
457 | ||
458 | static LIST_HEAD(reg_regdb_search_list); | |
459 | static DEFINE_MUTEX(reg_regdb_search_mutex); | |
460 | ||
461 | static void reg_regdb_search(struct work_struct *work) | |
462 | { | |
463 | struct reg_regdb_search_request *request; | |
464 | const struct ieee80211_regdomain *curdom, *regdom = NULL; | |
465 | int i; | |
466 | ||
467 | rtnl_lock(); | |
468 | ||
469 | mutex_lock(®_regdb_search_mutex); | |
470 | while (!list_empty(®_regdb_search_list)) { | |
471 | request = list_first_entry(®_regdb_search_list, | |
472 | struct reg_regdb_search_request, | |
473 | list); | |
474 | list_del(&request->list); | |
475 | ||
476 | for (i = 0; i < reg_regdb_size; i++) { | |
477 | curdom = reg_regdb[i]; | |
478 | ||
479 | if (alpha2_equal(request->alpha2, curdom->alpha2)) { | |
480 | regdom = reg_copy_regd(curdom); | |
481 | break; | |
482 | } | |
483 | } | |
484 | ||
485 | kfree(request); | |
486 | } | |
487 | mutex_unlock(®_regdb_search_mutex); | |
488 | ||
489 | if (!IS_ERR_OR_NULL(regdom)) | |
490 | set_regdom(regdom); | |
491 | ||
492 | rtnl_unlock(); | |
493 | } | |
494 | ||
495 | static DECLARE_WORK(reg_regdb_work, reg_regdb_search); | |
496 | ||
497 | static void reg_regdb_query(const char *alpha2) | |
498 | { | |
499 | struct reg_regdb_search_request *request; | |
500 | ||
501 | if (!alpha2) | |
502 | return; | |
503 | ||
504 | request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL); | |
505 | if (!request) | |
506 | return; | |
507 | ||
508 | memcpy(request->alpha2, alpha2, 2); | |
509 | ||
510 | mutex_lock(®_regdb_search_mutex); | |
511 | list_add_tail(&request->list, ®_regdb_search_list); | |
512 | mutex_unlock(®_regdb_search_mutex); | |
513 | ||
514 | schedule_work(®_regdb_work); | |
515 | } | |
516 | ||
517 | /* Feel free to add any other sanity checks here */ | |
518 | static void reg_regdb_size_check(void) | |
519 | { | |
520 | /* We should ideally BUILD_BUG_ON() but then random builds would fail */ | |
521 | WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it..."); | |
522 | } | |
523 | #else | |
524 | static inline void reg_regdb_size_check(void) {} | |
525 | static inline void reg_regdb_query(const char *alpha2) {} | |
526 | #endif /* CONFIG_CFG80211_INTERNAL_REGDB */ | |
527 | ||
528 | /* | |
529 | * This lets us keep regulatory code which is updated on a regulatory | |
530 | * basis in userspace. | |
531 | */ | |
532 | static int call_crda(const char *alpha2) | |
533 | { | |
534 | char country[12]; | |
535 | char *env[] = { country, NULL }; | |
536 | ||
537 | snprintf(country, sizeof(country), "COUNTRY=%c%c", | |
538 | alpha2[0], alpha2[1]); | |
539 | ||
540 | if (!is_world_regdom((char *) alpha2)) | |
541 | pr_info("Calling CRDA for country: %c%c\n", | |
542 | alpha2[0], alpha2[1]); | |
543 | else | |
544 | pr_info("Calling CRDA to update world regulatory domain\n"); | |
545 | ||
546 | /* query internal regulatory database (if it exists) */ | |
547 | reg_regdb_query(alpha2); | |
548 | ||
549 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, env); | |
550 | } | |
551 | ||
552 | static enum reg_request_treatment | |
553 | reg_call_crda(struct regulatory_request *request) | |
554 | { | |
555 | if (call_crda(request->alpha2)) | |
556 | return REG_REQ_IGNORE; | |
557 | return REG_REQ_OK; | |
558 | } | |
559 | ||
560 | bool reg_is_valid_request(const char *alpha2) | |
561 | { | |
562 | struct regulatory_request *lr = get_last_request(); | |
563 | ||
564 | if (!lr || lr->processed) | |
565 | return false; | |
566 | ||
567 | return alpha2_equal(lr->alpha2, alpha2); | |
568 | } | |
569 | ||
570 | static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy) | |
571 | { | |
572 | struct regulatory_request *lr = get_last_request(); | |
573 | ||
574 | /* | |
575 | * Follow the driver's regulatory domain, if present, unless a country | |
576 | * IE has been processed or a user wants to help complaince further | |
577 | */ | |
578 | if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
579 | lr->initiator != NL80211_REGDOM_SET_BY_USER && | |
580 | wiphy->regd) | |
581 | return get_wiphy_regdom(wiphy); | |
582 | ||
583 | return get_cfg80211_regdom(); | |
584 | } | |
585 | ||
586 | static unsigned int | |
587 | reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd, | |
588 | const struct ieee80211_reg_rule *rule) | |
589 | { | |
590 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; | |
591 | const struct ieee80211_freq_range *freq_range_tmp; | |
592 | const struct ieee80211_reg_rule *tmp; | |
593 | u32 start_freq, end_freq, idx, no; | |
594 | ||
595 | for (idx = 0; idx < rd->n_reg_rules; idx++) | |
596 | if (rule == &rd->reg_rules[idx]) | |
597 | break; | |
598 | ||
599 | if (idx == rd->n_reg_rules) | |
600 | return 0; | |
601 | ||
602 | /* get start_freq */ | |
603 | no = idx; | |
604 | ||
605 | while (no) { | |
606 | tmp = &rd->reg_rules[--no]; | |
607 | freq_range_tmp = &tmp->freq_range; | |
608 | ||
609 | if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz) | |
610 | break; | |
611 | ||
612 | freq_range = freq_range_tmp; | |
613 | } | |
614 | ||
615 | start_freq = freq_range->start_freq_khz; | |
616 | ||
617 | /* get end_freq */ | |
618 | freq_range = &rule->freq_range; | |
619 | no = idx; | |
620 | ||
621 | while (no < rd->n_reg_rules - 1) { | |
622 | tmp = &rd->reg_rules[++no]; | |
623 | freq_range_tmp = &tmp->freq_range; | |
624 | ||
625 | if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz) | |
626 | break; | |
627 | ||
628 | freq_range = freq_range_tmp; | |
629 | } | |
630 | ||
631 | end_freq = freq_range->end_freq_khz; | |
632 | ||
633 | return end_freq - start_freq; | |
634 | } | |
635 | ||
636 | unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd, | |
637 | const struct ieee80211_reg_rule *rule) | |
638 | { | |
639 | unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule); | |
640 | ||
641 | if (rule->flags & NL80211_RRF_NO_160MHZ) | |
642 | bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80)); | |
643 | if (rule->flags & NL80211_RRF_NO_80MHZ) | |
644 | bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40)); | |
645 | ||
646 | /* | |
647 | * HT40+/HT40- limits are handled per-channel. Only limit BW if both | |
648 | * are not allowed. | |
649 | */ | |
650 | if (rule->flags & NL80211_RRF_NO_HT40MINUS && | |
651 | rule->flags & NL80211_RRF_NO_HT40PLUS) | |
652 | bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20)); | |
653 | ||
654 | return bw; | |
655 | } | |
656 | ||
657 | /* Sanity check on a regulatory rule */ | |
658 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) | |
659 | { | |
660 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; | |
661 | u32 freq_diff; | |
662 | ||
663 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) | |
664 | return false; | |
665 | ||
666 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
667 | return false; | |
668 | ||
669 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
670 | ||
671 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || | |
672 | freq_range->max_bandwidth_khz > freq_diff) | |
673 | return false; | |
674 | ||
675 | return true; | |
676 | } | |
677 | ||
678 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) | |
679 | { | |
680 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
681 | unsigned int i; | |
682 | ||
683 | if (!rd->n_reg_rules) | |
684 | return false; | |
685 | ||
686 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) | |
687 | return false; | |
688 | ||
689 | for (i = 0; i < rd->n_reg_rules; i++) { | |
690 | reg_rule = &rd->reg_rules[i]; | |
691 | if (!is_valid_reg_rule(reg_rule)) | |
692 | return false; | |
693 | } | |
694 | ||
695 | return true; | |
696 | } | |
697 | ||
698 | static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range, | |
699 | u32 center_freq_khz, u32 bw_khz) | |
700 | { | |
701 | u32 start_freq_khz, end_freq_khz; | |
702 | ||
703 | start_freq_khz = center_freq_khz - (bw_khz/2); | |
704 | end_freq_khz = center_freq_khz + (bw_khz/2); | |
705 | ||
706 | if (start_freq_khz >= freq_range->start_freq_khz && | |
707 | end_freq_khz <= freq_range->end_freq_khz) | |
708 | return true; | |
709 | ||
710 | return false; | |
711 | } | |
712 | ||
713 | /** | |
714 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
715 | * @freq_range: frequency rule we want to query | |
716 | * @freq_khz: frequency we are inquiring about | |
717 | * | |
718 | * This lets us know if a specific frequency rule is or is not relevant to | |
719 | * a specific frequency's band. Bands are device specific and artificial | |
720 | * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"), | |
721 | * however it is safe for now to assume that a frequency rule should not be | |
722 | * part of a frequency's band if the start freq or end freq are off by more | |
723 | * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the | |
724 | * 60 GHz band. | |
725 | * This resolution can be lowered and should be considered as we add | |
726 | * regulatory rule support for other "bands". | |
727 | **/ | |
728 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
729 | u32 freq_khz) | |
730 | { | |
731 | #define ONE_GHZ_IN_KHZ 1000000 | |
732 | /* | |
733 | * From 802.11ad: directional multi-gigabit (DMG): | |
734 | * Pertaining to operation in a frequency band containing a channel | |
735 | * with the Channel starting frequency above 45 GHz. | |
736 | */ | |
737 | u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ? | |
738 | 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ; | |
739 | if (abs(freq_khz - freq_range->start_freq_khz) <= limit) | |
740 | return true; | |
741 | if (abs(freq_khz - freq_range->end_freq_khz) <= limit) | |
742 | return true; | |
743 | return false; | |
744 | #undef ONE_GHZ_IN_KHZ | |
745 | } | |
746 | ||
747 | /* | |
748 | * Later on we can perhaps use the more restrictive DFS | |
749 | * region but we don't have information for that yet so | |
750 | * for now simply disallow conflicts. | |
751 | */ | |
752 | static enum nl80211_dfs_regions | |
753 | reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1, | |
754 | const enum nl80211_dfs_regions dfs_region2) | |
755 | { | |
756 | if (dfs_region1 != dfs_region2) | |
757 | return NL80211_DFS_UNSET; | |
758 | return dfs_region1; | |
759 | } | |
760 | ||
761 | /* | |
762 | * Helper for regdom_intersect(), this does the real | |
763 | * mathematical intersection fun | |
764 | */ | |
765 | static int reg_rules_intersect(const struct ieee80211_regdomain *rd1, | |
766 | const struct ieee80211_regdomain *rd2, | |
767 | const struct ieee80211_reg_rule *rule1, | |
768 | const struct ieee80211_reg_rule *rule2, | |
769 | struct ieee80211_reg_rule *intersected_rule) | |
770 | { | |
771 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
772 | struct ieee80211_freq_range *freq_range; | |
773 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
774 | struct ieee80211_power_rule *power_rule; | |
775 | u32 freq_diff, max_bandwidth1, max_bandwidth2; | |
776 | ||
777 | freq_range1 = &rule1->freq_range; | |
778 | freq_range2 = &rule2->freq_range; | |
779 | freq_range = &intersected_rule->freq_range; | |
780 | ||
781 | power_rule1 = &rule1->power_rule; | |
782 | power_rule2 = &rule2->power_rule; | |
783 | power_rule = &intersected_rule->power_rule; | |
784 | ||
785 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
786 | freq_range2->start_freq_khz); | |
787 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
788 | freq_range2->end_freq_khz); | |
789 | ||
790 | max_bandwidth1 = freq_range1->max_bandwidth_khz; | |
791 | max_bandwidth2 = freq_range2->max_bandwidth_khz; | |
792 | ||
793 | if (rule1->flags & NL80211_RRF_AUTO_BW) | |
794 | max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1); | |
795 | if (rule2->flags & NL80211_RRF_AUTO_BW) | |
796 | max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2); | |
797 | ||
798 | freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2); | |
799 | ||
800 | intersected_rule->flags = rule1->flags | rule2->flags; | |
801 | ||
802 | /* | |
803 | * In case NL80211_RRF_AUTO_BW requested for both rules | |
804 | * set AUTO_BW in intersected rule also. Next we will | |
805 | * calculate BW correctly in handle_channel function. | |
806 | * In other case remove AUTO_BW flag while we calculate | |
807 | * maximum bandwidth correctly and auto calculation is | |
808 | * not required. | |
809 | */ | |
810 | if ((rule1->flags & NL80211_RRF_AUTO_BW) && | |
811 | (rule2->flags & NL80211_RRF_AUTO_BW)) | |
812 | intersected_rule->flags |= NL80211_RRF_AUTO_BW; | |
813 | else | |
814 | intersected_rule->flags &= ~NL80211_RRF_AUTO_BW; | |
815 | ||
816 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
817 | if (freq_range->max_bandwidth_khz > freq_diff) | |
818 | freq_range->max_bandwidth_khz = freq_diff; | |
819 | ||
820 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
821 | power_rule2->max_eirp); | |
822 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
823 | power_rule2->max_antenna_gain); | |
824 | ||
825 | intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms, | |
826 | rule2->dfs_cac_ms); | |
827 | ||
828 | if (!is_valid_reg_rule(intersected_rule)) | |
829 | return -EINVAL; | |
830 | ||
831 | return 0; | |
832 | } | |
833 | ||
834 | /* check whether old rule contains new rule */ | |
835 | static bool rule_contains(struct ieee80211_reg_rule *r1, | |
836 | struct ieee80211_reg_rule *r2) | |
837 | { | |
838 | /* for simplicity, currently consider only same flags */ | |
839 | if (r1->flags != r2->flags) | |
840 | return false; | |
841 | ||
842 | /* verify r1 is more restrictive */ | |
843 | if ((r1->power_rule.max_antenna_gain > | |
844 | r2->power_rule.max_antenna_gain) || | |
845 | r1->power_rule.max_eirp > r2->power_rule.max_eirp) | |
846 | return false; | |
847 | ||
848 | /* make sure r2's range is contained within r1 */ | |
849 | if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz || | |
850 | r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz) | |
851 | return false; | |
852 | ||
853 | /* and finally verify that r1.max_bw >= r2.max_bw */ | |
854 | if (r1->freq_range.max_bandwidth_khz < | |
855 | r2->freq_range.max_bandwidth_khz) | |
856 | return false; | |
857 | ||
858 | return true; | |
859 | } | |
860 | ||
861 | /* add or extend current rules. do nothing if rule is already contained */ | |
862 | static void add_rule(struct ieee80211_reg_rule *rule, | |
863 | struct ieee80211_reg_rule *reg_rules, u32 *n_rules) | |
864 | { | |
865 | struct ieee80211_reg_rule *tmp_rule; | |
866 | int i; | |
867 | ||
868 | for (i = 0; i < *n_rules; i++) { | |
869 | tmp_rule = ®_rules[i]; | |
870 | /* rule is already contained - do nothing */ | |
871 | if (rule_contains(tmp_rule, rule)) | |
872 | return; | |
873 | ||
874 | /* extend rule if possible */ | |
875 | if (rule_contains(rule, tmp_rule)) { | |
876 | memcpy(tmp_rule, rule, sizeof(*rule)); | |
877 | return; | |
878 | } | |
879 | } | |
880 | ||
881 | memcpy(®_rules[*n_rules], rule, sizeof(*rule)); | |
882 | (*n_rules)++; | |
883 | } | |
884 | ||
885 | /** | |
886 | * regdom_intersect - do the intersection between two regulatory domains | |
887 | * @rd1: first regulatory domain | |
888 | * @rd2: second regulatory domain | |
889 | * | |
890 | * Use this function to get the intersection between two regulatory domains. | |
891 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
892 | * as no one single alpha2 can represent this regulatory domain. | |
893 | * | |
894 | * Returns a pointer to the regulatory domain structure which will hold the | |
895 | * resulting intersection of rules between rd1 and rd2. We will | |
896 | * kzalloc() this structure for you. | |
897 | */ | |
898 | static struct ieee80211_regdomain * | |
899 | regdom_intersect(const struct ieee80211_regdomain *rd1, | |
900 | const struct ieee80211_regdomain *rd2) | |
901 | { | |
902 | int r, size_of_regd; | |
903 | unsigned int x, y; | |
904 | unsigned int num_rules = 0; | |
905 | const struct ieee80211_reg_rule *rule1, *rule2; | |
906 | struct ieee80211_reg_rule intersected_rule; | |
907 | struct ieee80211_regdomain *rd; | |
908 | ||
909 | if (!rd1 || !rd2) | |
910 | return NULL; | |
911 | ||
912 | /* | |
913 | * First we get a count of the rules we'll need, then we actually | |
914 | * build them. This is to so we can malloc() and free() a | |
915 | * regdomain once. The reason we use reg_rules_intersect() here | |
916 | * is it will return -EINVAL if the rule computed makes no sense. | |
917 | * All rules that do check out OK are valid. | |
918 | */ | |
919 | ||
920 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
921 | rule1 = &rd1->reg_rules[x]; | |
922 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
923 | rule2 = &rd2->reg_rules[y]; | |
924 | if (!reg_rules_intersect(rd1, rd2, rule1, rule2, | |
925 | &intersected_rule)) | |
926 | num_rules++; | |
927 | } | |
928 | } | |
929 | ||
930 | if (!num_rules) | |
931 | return NULL; | |
932 | ||
933 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
934 | num_rules * sizeof(struct ieee80211_reg_rule); | |
935 | ||
936 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
937 | if (!rd) | |
938 | return NULL; | |
939 | ||
940 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
941 | rule1 = &rd1->reg_rules[x]; | |
942 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
943 | rule2 = &rd2->reg_rules[y]; | |
944 | r = reg_rules_intersect(rd1, rd2, rule1, rule2, | |
945 | &intersected_rule); | |
946 | /* | |
947 | * No need to memset here the intersected rule here as | |
948 | * we're not using the stack anymore | |
949 | */ | |
950 | if (r) | |
951 | continue; | |
952 | ||
953 | add_rule(&intersected_rule, rd->reg_rules, | |
954 | &rd->n_reg_rules); | |
955 | } | |
956 | } | |
957 | ||
958 | rd->alpha2[0] = '9'; | |
959 | rd->alpha2[1] = '8'; | |
960 | rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region, | |
961 | rd2->dfs_region); | |
962 | ||
963 | return rd; | |
964 | } | |
965 | ||
966 | /* | |
967 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
968 | * want to just have the channel structure use these | |
969 | */ | |
970 | static u32 map_regdom_flags(u32 rd_flags) | |
971 | { | |
972 | u32 channel_flags = 0; | |
973 | if (rd_flags & NL80211_RRF_NO_IR_ALL) | |
974 | channel_flags |= IEEE80211_CHAN_NO_IR; | |
975 | if (rd_flags & NL80211_RRF_DFS) | |
976 | channel_flags |= IEEE80211_CHAN_RADAR; | |
977 | if (rd_flags & NL80211_RRF_NO_OFDM) | |
978 | channel_flags |= IEEE80211_CHAN_NO_OFDM; | |
979 | if (rd_flags & NL80211_RRF_NO_OUTDOOR) | |
980 | channel_flags |= IEEE80211_CHAN_INDOOR_ONLY; | |
981 | if (rd_flags & NL80211_RRF_GO_CONCURRENT) | |
982 | channel_flags |= IEEE80211_CHAN_GO_CONCURRENT; | |
983 | if (rd_flags & NL80211_RRF_NO_HT40MINUS) | |
984 | channel_flags |= IEEE80211_CHAN_NO_HT40MINUS; | |
985 | if (rd_flags & NL80211_RRF_NO_HT40PLUS) | |
986 | channel_flags |= IEEE80211_CHAN_NO_HT40PLUS; | |
987 | if (rd_flags & NL80211_RRF_NO_80MHZ) | |
988 | channel_flags |= IEEE80211_CHAN_NO_80MHZ; | |
989 | if (rd_flags & NL80211_RRF_NO_160MHZ) | |
990 | channel_flags |= IEEE80211_CHAN_NO_160MHZ; | |
991 | return channel_flags; | |
992 | } | |
993 | ||
994 | static const struct ieee80211_reg_rule * | |
995 | freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq, | |
996 | const struct ieee80211_regdomain *regd) | |
997 | { | |
998 | int i; | |
999 | bool band_rule_found = false; | |
1000 | bool bw_fits = false; | |
1001 | ||
1002 | if (!regd) | |
1003 | return ERR_PTR(-EINVAL); | |
1004 | ||
1005 | for (i = 0; i < regd->n_reg_rules; i++) { | |
1006 | const struct ieee80211_reg_rule *rr; | |
1007 | const struct ieee80211_freq_range *fr = NULL; | |
1008 | ||
1009 | rr = ®d->reg_rules[i]; | |
1010 | fr = &rr->freq_range; | |
1011 | ||
1012 | /* | |
1013 | * We only need to know if one frequency rule was | |
1014 | * was in center_freq's band, that's enough, so lets | |
1015 | * not overwrite it once found | |
1016 | */ | |
1017 | if (!band_rule_found) | |
1018 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
1019 | ||
1020 | bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20)); | |
1021 | ||
1022 | if (band_rule_found && bw_fits) | |
1023 | return rr; | |
1024 | } | |
1025 | ||
1026 | if (!band_rule_found) | |
1027 | return ERR_PTR(-ERANGE); | |
1028 | ||
1029 | return ERR_PTR(-EINVAL); | |
1030 | } | |
1031 | ||
1032 | const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy, | |
1033 | u32 center_freq) | |
1034 | { | |
1035 | const struct ieee80211_regdomain *regd; | |
1036 | ||
1037 | regd = reg_get_regdomain(wiphy); | |
1038 | ||
1039 | return freq_reg_info_regd(wiphy, center_freq, regd); | |
1040 | } | |
1041 | EXPORT_SYMBOL(freq_reg_info); | |
1042 | ||
1043 | const char *reg_initiator_name(enum nl80211_reg_initiator initiator) | |
1044 | { | |
1045 | switch (initiator) { | |
1046 | case NL80211_REGDOM_SET_BY_CORE: | |
1047 | return "core"; | |
1048 | case NL80211_REGDOM_SET_BY_USER: | |
1049 | return "user"; | |
1050 | case NL80211_REGDOM_SET_BY_DRIVER: | |
1051 | return "driver"; | |
1052 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
1053 | return "country IE"; | |
1054 | default: | |
1055 | WARN_ON(1); | |
1056 | return "bug"; | |
1057 | } | |
1058 | } | |
1059 | EXPORT_SYMBOL(reg_initiator_name); | |
1060 | ||
1061 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1062 | static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain *regd, | |
1063 | struct ieee80211_channel *chan, | |
1064 | const struct ieee80211_reg_rule *reg_rule) | |
1065 | { | |
1066 | const struct ieee80211_power_rule *power_rule; | |
1067 | const struct ieee80211_freq_range *freq_range; | |
1068 | char max_antenna_gain[32], bw[32]; | |
1069 | ||
1070 | power_rule = ®_rule->power_rule; | |
1071 | freq_range = ®_rule->freq_range; | |
1072 | ||
1073 | if (!power_rule->max_antenna_gain) | |
1074 | snprintf(max_antenna_gain, sizeof(max_antenna_gain), "N/A"); | |
1075 | else | |
1076 | snprintf(max_antenna_gain, sizeof(max_antenna_gain), "%d", | |
1077 | power_rule->max_antenna_gain); | |
1078 | ||
1079 | if (reg_rule->flags & NL80211_RRF_AUTO_BW) | |
1080 | snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO", | |
1081 | freq_range->max_bandwidth_khz, | |
1082 | reg_get_max_bandwidth(regd, reg_rule)); | |
1083 | else | |
1084 | snprintf(bw, sizeof(bw), "%d KHz", | |
1085 | freq_range->max_bandwidth_khz); | |
1086 | ||
1087 | REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n", | |
1088 | chan->center_freq); | |
1089 | ||
1090 | REG_DBG_PRINT("%d KHz - %d KHz @ %s), (%s mBi, %d mBm)\n", | |
1091 | freq_range->start_freq_khz, freq_range->end_freq_khz, | |
1092 | bw, max_antenna_gain, | |
1093 | power_rule->max_eirp); | |
1094 | } | |
1095 | #else | |
1096 | static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain *regd, | |
1097 | struct ieee80211_channel *chan, | |
1098 | const struct ieee80211_reg_rule *reg_rule) | |
1099 | { | |
1100 | return; | |
1101 | } | |
1102 | #endif | |
1103 | ||
1104 | /* | |
1105 | * Note that right now we assume the desired channel bandwidth | |
1106 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz | |
1107 | * per channel, the primary and the extension channel). | |
1108 | */ | |
1109 | static void handle_channel(struct wiphy *wiphy, | |
1110 | enum nl80211_reg_initiator initiator, | |
1111 | struct ieee80211_channel *chan) | |
1112 | { | |
1113 | u32 flags, bw_flags = 0; | |
1114 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1115 | const struct ieee80211_power_rule *power_rule = NULL; | |
1116 | const struct ieee80211_freq_range *freq_range = NULL; | |
1117 | struct wiphy *request_wiphy = NULL; | |
1118 | struct regulatory_request *lr = get_last_request(); | |
1119 | const struct ieee80211_regdomain *regd; | |
1120 | u32 max_bandwidth_khz; | |
1121 | ||
1122 | request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx); | |
1123 | ||
1124 | flags = chan->orig_flags; | |
1125 | ||
1126 | reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq)); | |
1127 | if (IS_ERR(reg_rule)) { | |
1128 | /* | |
1129 | * We will disable all channels that do not match our | |
1130 | * received regulatory rule unless the hint is coming | |
1131 | * from a Country IE and the Country IE had no information | |
1132 | * about a band. The IEEE 802.11 spec allows for an AP | |
1133 | * to send only a subset of the regulatory rules allowed, | |
1134 | * so an AP in the US that only supports 2.4 GHz may only send | |
1135 | * a country IE with information for the 2.4 GHz band | |
1136 | * while 5 GHz is still supported. | |
1137 | */ | |
1138 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1139 | PTR_ERR(reg_rule) == -ERANGE) | |
1140 | return; | |
1141 | ||
1142 | if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER && | |
1143 | request_wiphy && request_wiphy == wiphy && | |
1144 | request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) { | |
1145 | REG_DBG_PRINT("Disabling freq %d MHz for good\n", | |
1146 | chan->center_freq); | |
1147 | chan->orig_flags |= IEEE80211_CHAN_DISABLED; | |
1148 | chan->flags = chan->orig_flags; | |
1149 | } else { | |
1150 | REG_DBG_PRINT("Disabling freq %d MHz\n", | |
1151 | chan->center_freq); | |
1152 | chan->flags |= IEEE80211_CHAN_DISABLED; | |
1153 | } | |
1154 | return; | |
1155 | } | |
1156 | ||
1157 | regd = reg_get_regdomain(wiphy); | |
1158 | chan_reg_rule_print_dbg(regd, chan, reg_rule); | |
1159 | ||
1160 | power_rule = ®_rule->power_rule; | |
1161 | freq_range = ®_rule->freq_range; | |
1162 | ||
1163 | max_bandwidth_khz = freq_range->max_bandwidth_khz; | |
1164 | /* Check if auto calculation requested */ | |
1165 | if (reg_rule->flags & NL80211_RRF_AUTO_BW) | |
1166 | max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule); | |
1167 | ||
1168 | if (max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1169 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
1170 | if (max_bandwidth_khz < MHZ_TO_KHZ(80)) | |
1171 | bw_flags |= IEEE80211_CHAN_NO_80MHZ; | |
1172 | if (max_bandwidth_khz < MHZ_TO_KHZ(160)) | |
1173 | bw_flags |= IEEE80211_CHAN_NO_160MHZ; | |
1174 | ||
1175 | if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER && | |
1176 | request_wiphy && request_wiphy == wiphy && | |
1177 | request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) { | |
1178 | /* | |
1179 | * This guarantees the driver's requested regulatory domain | |
1180 | * will always be used as a base for further regulatory | |
1181 | * settings | |
1182 | */ | |
1183 | chan->flags = chan->orig_flags = | |
1184 | map_regdom_flags(reg_rule->flags) | bw_flags; | |
1185 | chan->max_antenna_gain = chan->orig_mag = | |
1186 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
1187 | chan->max_reg_power = chan->max_power = chan->orig_mpwr = | |
1188 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
1189 | ||
1190 | if (chan->flags & IEEE80211_CHAN_RADAR) { | |
1191 | chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS; | |
1192 | if (reg_rule->dfs_cac_ms) | |
1193 | chan->dfs_cac_ms = reg_rule->dfs_cac_ms; | |
1194 | } | |
1195 | ||
1196 | return; | |
1197 | } | |
1198 | ||
1199 | chan->dfs_state = NL80211_DFS_USABLE; | |
1200 | chan->dfs_state_entered = jiffies; | |
1201 | ||
1202 | chan->beacon_found = false; | |
1203 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); | |
1204 | chan->max_antenna_gain = | |
1205 | min_t(int, chan->orig_mag, | |
1206 | MBI_TO_DBI(power_rule->max_antenna_gain)); | |
1207 | chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
1208 | ||
1209 | if (chan->flags & IEEE80211_CHAN_RADAR) { | |
1210 | if (reg_rule->dfs_cac_ms) | |
1211 | chan->dfs_cac_ms = reg_rule->dfs_cac_ms; | |
1212 | else | |
1213 | chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS; | |
1214 | } | |
1215 | ||
1216 | if (chan->orig_mpwr) { | |
1217 | /* | |
1218 | * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER | |
1219 | * will always follow the passed country IE power settings. | |
1220 | */ | |
1221 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1222 | wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER) | |
1223 | chan->max_power = chan->max_reg_power; | |
1224 | else | |
1225 | chan->max_power = min(chan->orig_mpwr, | |
1226 | chan->max_reg_power); | |
1227 | } else | |
1228 | chan->max_power = chan->max_reg_power; | |
1229 | } | |
1230 | ||
1231 | static void handle_band(struct wiphy *wiphy, | |
1232 | enum nl80211_reg_initiator initiator, | |
1233 | struct ieee80211_supported_band *sband) | |
1234 | { | |
1235 | unsigned int i; | |
1236 | ||
1237 | if (!sband) | |
1238 | return; | |
1239 | ||
1240 | for (i = 0; i < sband->n_channels; i++) | |
1241 | handle_channel(wiphy, initiator, &sband->channels[i]); | |
1242 | } | |
1243 | ||
1244 | static bool reg_request_cell_base(struct regulatory_request *request) | |
1245 | { | |
1246 | if (request->initiator != NL80211_REGDOM_SET_BY_USER) | |
1247 | return false; | |
1248 | return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE; | |
1249 | } | |
1250 | ||
1251 | static bool reg_request_indoor(struct regulatory_request *request) | |
1252 | { | |
1253 | if (request->initiator != NL80211_REGDOM_SET_BY_USER) | |
1254 | return false; | |
1255 | return request->user_reg_hint_type == NL80211_USER_REG_HINT_INDOOR; | |
1256 | } | |
1257 | ||
1258 | bool reg_last_request_cell_base(void) | |
1259 | { | |
1260 | return reg_request_cell_base(get_last_request()); | |
1261 | } | |
1262 | ||
1263 | #ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS | |
1264 | /* Core specific check */ | |
1265 | static enum reg_request_treatment | |
1266 | reg_ignore_cell_hint(struct regulatory_request *pending_request) | |
1267 | { | |
1268 | struct regulatory_request *lr = get_last_request(); | |
1269 | ||
1270 | if (!reg_num_devs_support_basehint) | |
1271 | return REG_REQ_IGNORE; | |
1272 | ||
1273 | if (reg_request_cell_base(lr) && | |
1274 | !regdom_changes(pending_request->alpha2)) | |
1275 | return REG_REQ_ALREADY_SET; | |
1276 | ||
1277 | return REG_REQ_OK; | |
1278 | } | |
1279 | ||
1280 | /* Device specific check */ | |
1281 | static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy) | |
1282 | { | |
1283 | return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS); | |
1284 | } | |
1285 | #else | |
1286 | static int reg_ignore_cell_hint(struct regulatory_request *pending_request) | |
1287 | { | |
1288 | return REG_REQ_IGNORE; | |
1289 | } | |
1290 | ||
1291 | static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy) | |
1292 | { | |
1293 | return true; | |
1294 | } | |
1295 | #endif | |
1296 | ||
1297 | static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy) | |
1298 | { | |
1299 | if (wiphy->regulatory_flags & REGULATORY_STRICT_REG && | |
1300 | !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)) | |
1301 | return true; | |
1302 | return false; | |
1303 | } | |
1304 | ||
1305 | static bool ignore_reg_update(struct wiphy *wiphy, | |
1306 | enum nl80211_reg_initiator initiator) | |
1307 | { | |
1308 | struct regulatory_request *lr = get_last_request(); | |
1309 | ||
1310 | if (!lr) { | |
1311 | REG_DBG_PRINT("Ignoring regulatory request set by %s " | |
1312 | "since last_request is not set\n", | |
1313 | reg_initiator_name(initiator)); | |
1314 | return true; | |
1315 | } | |
1316 | ||
1317 | if (initiator == NL80211_REGDOM_SET_BY_CORE && | |
1318 | wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { | |
1319 | REG_DBG_PRINT("Ignoring regulatory request set by %s " | |
1320 | "since the driver uses its own custom " | |
1321 | "regulatory domain\n", | |
1322 | reg_initiator_name(initiator)); | |
1323 | return true; | |
1324 | } | |
1325 | ||
1326 | /* | |
1327 | * wiphy->regd will be set once the device has its own | |
1328 | * desired regulatory domain set | |
1329 | */ | |
1330 | if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd && | |
1331 | initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1332 | !is_world_regdom(lr->alpha2)) { | |
1333 | REG_DBG_PRINT("Ignoring regulatory request set by %s " | |
1334 | "since the driver requires its own regulatory " | |
1335 | "domain to be set first\n", | |
1336 | reg_initiator_name(initiator)); | |
1337 | return true; | |
1338 | } | |
1339 | ||
1340 | if (reg_request_cell_base(lr)) | |
1341 | return reg_dev_ignore_cell_hint(wiphy); | |
1342 | ||
1343 | return false; | |
1344 | } | |
1345 | ||
1346 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1347 | { | |
1348 | const struct ieee80211_regdomain *cr = get_cfg80211_regdom(); | |
1349 | const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy); | |
1350 | struct regulatory_request *lr = get_last_request(); | |
1351 | ||
1352 | if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2))) | |
1353 | return true; | |
1354 | ||
1355 | if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1356 | wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) | |
1357 | return true; | |
1358 | ||
1359 | return false; | |
1360 | } | |
1361 | ||
1362 | static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx, | |
1363 | struct reg_beacon *reg_beacon) | |
1364 | { | |
1365 | struct ieee80211_supported_band *sband; | |
1366 | struct ieee80211_channel *chan; | |
1367 | bool channel_changed = false; | |
1368 | struct ieee80211_channel chan_before; | |
1369 | ||
1370 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1371 | chan = &sband->channels[chan_idx]; | |
1372 | ||
1373 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
1374 | return; | |
1375 | ||
1376 | if (chan->beacon_found) | |
1377 | return; | |
1378 | ||
1379 | chan->beacon_found = true; | |
1380 | ||
1381 | if (!reg_is_world_roaming(wiphy)) | |
1382 | return; | |
1383 | ||
1384 | if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS) | |
1385 | return; | |
1386 | ||
1387 | chan_before.center_freq = chan->center_freq; | |
1388 | chan_before.flags = chan->flags; | |
1389 | ||
1390 | if (chan->flags & IEEE80211_CHAN_NO_IR) { | |
1391 | chan->flags &= ~IEEE80211_CHAN_NO_IR; | |
1392 | channel_changed = true; | |
1393 | } | |
1394 | ||
1395 | if (channel_changed) | |
1396 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
1397 | } | |
1398 | ||
1399 | /* | |
1400 | * Called when a scan on a wiphy finds a beacon on | |
1401 | * new channel | |
1402 | */ | |
1403 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
1404 | struct reg_beacon *reg_beacon) | |
1405 | { | |
1406 | unsigned int i; | |
1407 | struct ieee80211_supported_band *sband; | |
1408 | ||
1409 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1410 | return; | |
1411 | ||
1412 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1413 | ||
1414 | for (i = 0; i < sband->n_channels; i++) | |
1415 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * Called upon reg changes or a new wiphy is added | |
1420 | */ | |
1421 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1422 | { | |
1423 | unsigned int i; | |
1424 | struct ieee80211_supported_band *sband; | |
1425 | struct reg_beacon *reg_beacon; | |
1426 | ||
1427 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1428 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1429 | continue; | |
1430 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1431 | for (i = 0; i < sband->n_channels; i++) | |
1432 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1433 | } | |
1434 | } | |
1435 | ||
1436 | /* Reap the advantages of previously found beacons */ | |
1437 | static void reg_process_beacons(struct wiphy *wiphy) | |
1438 | { | |
1439 | /* | |
1440 | * Means we are just firing up cfg80211, so no beacons would | |
1441 | * have been processed yet. | |
1442 | */ | |
1443 | if (!last_request) | |
1444 | return; | |
1445 | wiphy_update_beacon_reg(wiphy); | |
1446 | } | |
1447 | ||
1448 | static bool is_ht40_allowed(struct ieee80211_channel *chan) | |
1449 | { | |
1450 | if (!chan) | |
1451 | return false; | |
1452 | if (chan->flags & IEEE80211_CHAN_DISABLED) | |
1453 | return false; | |
1454 | /* This would happen when regulatory rules disallow HT40 completely */ | |
1455 | if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40) | |
1456 | return false; | |
1457 | return true; | |
1458 | } | |
1459 | ||
1460 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, | |
1461 | struct ieee80211_channel *channel) | |
1462 | { | |
1463 | struct ieee80211_supported_band *sband = wiphy->bands[channel->band]; | |
1464 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; | |
1465 | unsigned int i; | |
1466 | ||
1467 | if (!is_ht40_allowed(channel)) { | |
1468 | channel->flags |= IEEE80211_CHAN_NO_HT40; | |
1469 | return; | |
1470 | } | |
1471 | ||
1472 | /* | |
1473 | * We need to ensure the extension channels exist to | |
1474 | * be able to use HT40- or HT40+, this finds them (or not) | |
1475 | */ | |
1476 | for (i = 0; i < sband->n_channels; i++) { | |
1477 | struct ieee80211_channel *c = &sband->channels[i]; | |
1478 | ||
1479 | if (c->center_freq == (channel->center_freq - 20)) | |
1480 | channel_before = c; | |
1481 | if (c->center_freq == (channel->center_freq + 20)) | |
1482 | channel_after = c; | |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * Please note that this assumes target bandwidth is 20 MHz, | |
1487 | * if that ever changes we also need to change the below logic | |
1488 | * to include that as well. | |
1489 | */ | |
1490 | if (!is_ht40_allowed(channel_before)) | |
1491 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; | |
1492 | else | |
1493 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; | |
1494 | ||
1495 | if (!is_ht40_allowed(channel_after)) | |
1496 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; | |
1497 | else | |
1498 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; | |
1499 | } | |
1500 | ||
1501 | static void reg_process_ht_flags_band(struct wiphy *wiphy, | |
1502 | struct ieee80211_supported_band *sband) | |
1503 | { | |
1504 | unsigned int i; | |
1505 | ||
1506 | if (!sband) | |
1507 | return; | |
1508 | ||
1509 | for (i = 0; i < sband->n_channels; i++) | |
1510 | reg_process_ht_flags_channel(wiphy, &sband->channels[i]); | |
1511 | } | |
1512 | ||
1513 | static void reg_process_ht_flags(struct wiphy *wiphy) | |
1514 | { | |
1515 | enum ieee80211_band band; | |
1516 | ||
1517 | if (!wiphy) | |
1518 | return; | |
1519 | ||
1520 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
1521 | reg_process_ht_flags_band(wiphy, wiphy->bands[band]); | |
1522 | } | |
1523 | ||
1524 | static void reg_call_notifier(struct wiphy *wiphy, | |
1525 | struct regulatory_request *request) | |
1526 | { | |
1527 | if (wiphy->reg_notifier) | |
1528 | wiphy->reg_notifier(wiphy, request); | |
1529 | } | |
1530 | ||
1531 | static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev) | |
1532 | { | |
1533 | struct ieee80211_channel *ch; | |
1534 | struct cfg80211_chan_def chandef; | |
1535 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
1536 | bool ret = true; | |
1537 | ||
1538 | wdev_lock(wdev); | |
1539 | ||
1540 | if (!wdev->netdev || !netif_running(wdev->netdev)) | |
1541 | goto out; | |
1542 | ||
1543 | switch (wdev->iftype) { | |
1544 | case NL80211_IFTYPE_AP: | |
1545 | case NL80211_IFTYPE_P2P_GO: | |
1546 | if (!wdev->beacon_interval) | |
1547 | goto out; | |
1548 | ||
1549 | ret = cfg80211_reg_can_beacon(wiphy, | |
1550 | &wdev->chandef, wdev->iftype); | |
1551 | break; | |
1552 | case NL80211_IFTYPE_STATION: | |
1553 | case NL80211_IFTYPE_P2P_CLIENT: | |
1554 | case NL80211_IFTYPE_ADHOC: | |
1555 | if (!wdev->current_bss || | |
1556 | !wdev->current_bss->pub.channel) | |
1557 | goto out; | |
1558 | ||
1559 | ch = wdev->current_bss->pub.channel; | |
1560 | if (rdev->ops->get_channel && | |
1561 | !rdev_get_channel(rdev, wdev, &chandef)) | |
1562 | ret = cfg80211_chandef_usable(wiphy, &chandef, | |
1563 | IEEE80211_CHAN_DISABLED); | |
1564 | else | |
1565 | ret = !(ch->flags & IEEE80211_CHAN_DISABLED); | |
1566 | break; | |
1567 | case NL80211_IFTYPE_MONITOR: | |
1568 | case NL80211_IFTYPE_AP_VLAN: | |
1569 | case NL80211_IFTYPE_P2P_DEVICE: | |
1570 | /* no enforcement required */ | |
1571 | break; | |
1572 | default: | |
1573 | /* others not implemented for now */ | |
1574 | WARN_ON(1); | |
1575 | break; | |
1576 | } | |
1577 | ||
1578 | out: | |
1579 | wdev_unlock(wdev); | |
1580 | return ret; | |
1581 | } | |
1582 | ||
1583 | static void reg_leave_invalid_chans(struct wiphy *wiphy) | |
1584 | { | |
1585 | struct wireless_dev *wdev; | |
1586 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
1587 | ||
1588 | ASSERT_RTNL(); | |
1589 | ||
1590 | list_for_each_entry(wdev, &rdev->wdev_list, list) | |
1591 | if (!reg_wdev_chan_valid(wiphy, wdev)) | |
1592 | cfg80211_leave(rdev, wdev); | |
1593 | } | |
1594 | ||
1595 | static void reg_check_chans_work(struct work_struct *work) | |
1596 | { | |
1597 | struct cfg80211_registered_device *rdev; | |
1598 | ||
1599 | REG_DBG_PRINT("Verifying active interfaces after reg change\n"); | |
1600 | rtnl_lock(); | |
1601 | ||
1602 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) | |
1603 | if (!(rdev->wiphy.regulatory_flags & | |
1604 | REGULATORY_IGNORE_STALE_KICKOFF)) | |
1605 | reg_leave_invalid_chans(&rdev->wiphy); | |
1606 | ||
1607 | rtnl_unlock(); | |
1608 | } | |
1609 | ||
1610 | static void reg_check_channels(void) | |
1611 | { | |
1612 | /* | |
1613 | * Give usermode a chance to do something nicer (move to another | |
1614 | * channel, orderly disconnection), before forcing a disconnection. | |
1615 | */ | |
1616 | mod_delayed_work(system_power_efficient_wq, | |
1617 | ®_check_chans, | |
1618 | msecs_to_jiffies(REG_ENFORCE_GRACE_MS)); | |
1619 | } | |
1620 | ||
1621 | static void wiphy_update_regulatory(struct wiphy *wiphy, | |
1622 | enum nl80211_reg_initiator initiator) | |
1623 | { | |
1624 | enum ieee80211_band band; | |
1625 | struct regulatory_request *lr = get_last_request(); | |
1626 | ||
1627 | if (ignore_reg_update(wiphy, initiator)) { | |
1628 | /* | |
1629 | * Regulatory updates set by CORE are ignored for custom | |
1630 | * regulatory cards. Let us notify the changes to the driver, | |
1631 | * as some drivers used this to restore its orig_* reg domain. | |
1632 | */ | |
1633 | if (initiator == NL80211_REGDOM_SET_BY_CORE && | |
1634 | wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) | |
1635 | reg_call_notifier(wiphy, lr); | |
1636 | return; | |
1637 | } | |
1638 | ||
1639 | lr->dfs_region = get_cfg80211_regdom()->dfs_region; | |
1640 | ||
1641 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
1642 | handle_band(wiphy, initiator, wiphy->bands[band]); | |
1643 | ||
1644 | reg_process_beacons(wiphy); | |
1645 | reg_process_ht_flags(wiphy); | |
1646 | reg_call_notifier(wiphy, lr); | |
1647 | } | |
1648 | ||
1649 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) | |
1650 | { | |
1651 | struct cfg80211_registered_device *rdev; | |
1652 | struct wiphy *wiphy; | |
1653 | ||
1654 | ASSERT_RTNL(); | |
1655 | ||
1656 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
1657 | wiphy = &rdev->wiphy; | |
1658 | wiphy_update_regulatory(wiphy, initiator); | |
1659 | } | |
1660 | ||
1661 | reg_check_channels(); | |
1662 | } | |
1663 | ||
1664 | static void handle_channel_custom(struct wiphy *wiphy, | |
1665 | struct ieee80211_channel *chan, | |
1666 | const struct ieee80211_regdomain *regd) | |
1667 | { | |
1668 | u32 bw_flags = 0; | |
1669 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1670 | const struct ieee80211_power_rule *power_rule = NULL; | |
1671 | const struct ieee80211_freq_range *freq_range = NULL; | |
1672 | u32 max_bandwidth_khz; | |
1673 | ||
1674 | reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq), | |
1675 | regd); | |
1676 | ||
1677 | if (IS_ERR(reg_rule)) { | |
1678 | REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n", | |
1679 | chan->center_freq); | |
1680 | chan->orig_flags |= IEEE80211_CHAN_DISABLED; | |
1681 | chan->flags = chan->orig_flags; | |
1682 | return; | |
1683 | } | |
1684 | ||
1685 | chan_reg_rule_print_dbg(regd, chan, reg_rule); | |
1686 | ||
1687 | power_rule = ®_rule->power_rule; | |
1688 | freq_range = ®_rule->freq_range; | |
1689 | ||
1690 | max_bandwidth_khz = freq_range->max_bandwidth_khz; | |
1691 | /* Check if auto calculation requested */ | |
1692 | if (reg_rule->flags & NL80211_RRF_AUTO_BW) | |
1693 | max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule); | |
1694 | ||
1695 | if (max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1696 | bw_flags = IEEE80211_CHAN_NO_HT40; | |
1697 | if (max_bandwidth_khz < MHZ_TO_KHZ(80)) | |
1698 | bw_flags |= IEEE80211_CHAN_NO_80MHZ; | |
1699 | if (max_bandwidth_khz < MHZ_TO_KHZ(160)) | |
1700 | bw_flags |= IEEE80211_CHAN_NO_160MHZ; | |
1701 | ||
1702 | chan->dfs_state_entered = jiffies; | |
1703 | chan->dfs_state = NL80211_DFS_USABLE; | |
1704 | ||
1705 | chan->beacon_found = false; | |
1706 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; | |
1707 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
1708 | chan->max_reg_power = chan->max_power = | |
1709 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
1710 | ||
1711 | if (chan->flags & IEEE80211_CHAN_RADAR) { | |
1712 | if (reg_rule->dfs_cac_ms) | |
1713 | chan->dfs_cac_ms = reg_rule->dfs_cac_ms; | |
1714 | else | |
1715 | chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS; | |
1716 | } | |
1717 | ||
1718 | chan->max_power = chan->max_reg_power; | |
1719 | } | |
1720 | ||
1721 | static void handle_band_custom(struct wiphy *wiphy, | |
1722 | struct ieee80211_supported_band *sband, | |
1723 | const struct ieee80211_regdomain *regd) | |
1724 | { | |
1725 | unsigned int i; | |
1726 | ||
1727 | if (!sband) | |
1728 | return; | |
1729 | ||
1730 | for (i = 0; i < sband->n_channels; i++) | |
1731 | handle_channel_custom(wiphy, &sband->channels[i], regd); | |
1732 | } | |
1733 | ||
1734 | /* Used by drivers prior to wiphy registration */ | |
1735 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1736 | const struct ieee80211_regdomain *regd) | |
1737 | { | |
1738 | enum ieee80211_band band; | |
1739 | unsigned int bands_set = 0; | |
1740 | ||
1741 | WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG), | |
1742 | "wiphy should have REGULATORY_CUSTOM_REG\n"); | |
1743 | wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG; | |
1744 | ||
1745 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1746 | if (!wiphy->bands[band]) | |
1747 | continue; | |
1748 | handle_band_custom(wiphy, wiphy->bands[band], regd); | |
1749 | bands_set++; | |
1750 | } | |
1751 | ||
1752 | /* | |
1753 | * no point in calling this if it won't have any effect | |
1754 | * on your device's supported bands. | |
1755 | */ | |
1756 | WARN_ON(!bands_set); | |
1757 | } | |
1758 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); | |
1759 | ||
1760 | static void reg_set_request_processed(void) | |
1761 | { | |
1762 | bool need_more_processing = false; | |
1763 | struct regulatory_request *lr = get_last_request(); | |
1764 | ||
1765 | lr->processed = true; | |
1766 | ||
1767 | spin_lock(®_requests_lock); | |
1768 | if (!list_empty(®_requests_list)) | |
1769 | need_more_processing = true; | |
1770 | spin_unlock(®_requests_lock); | |
1771 | ||
1772 | if (lr->initiator == NL80211_REGDOM_SET_BY_USER) | |
1773 | cancel_delayed_work(®_timeout); | |
1774 | ||
1775 | if (need_more_processing) | |
1776 | schedule_work(®_work); | |
1777 | } | |
1778 | ||
1779 | /** | |
1780 | * reg_process_hint_core - process core regulatory requests | |
1781 | * @pending_request: a pending core regulatory request | |
1782 | * | |
1783 | * The wireless subsystem can use this function to process | |
1784 | * a regulatory request issued by the regulatory core. | |
1785 | * | |
1786 | * Returns one of the different reg request treatment values. | |
1787 | */ | |
1788 | static enum reg_request_treatment | |
1789 | reg_process_hint_core(struct regulatory_request *core_request) | |
1790 | { | |
1791 | ||
1792 | core_request->intersect = false; | |
1793 | core_request->processed = false; | |
1794 | ||
1795 | reg_update_last_request(core_request); | |
1796 | ||
1797 | return reg_call_crda(core_request); | |
1798 | } | |
1799 | ||
1800 | static enum reg_request_treatment | |
1801 | __reg_process_hint_user(struct regulatory_request *user_request) | |
1802 | { | |
1803 | struct regulatory_request *lr = get_last_request(); | |
1804 | ||
1805 | if (reg_request_indoor(user_request)) { | |
1806 | reg_is_indoor = true; | |
1807 | return REG_REQ_USER_HINT_HANDLED; | |
1808 | } | |
1809 | ||
1810 | if (reg_request_cell_base(user_request)) | |
1811 | return reg_ignore_cell_hint(user_request); | |
1812 | ||
1813 | if (reg_request_cell_base(lr)) | |
1814 | return REG_REQ_IGNORE; | |
1815 | ||
1816 | if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
1817 | return REG_REQ_INTERSECT; | |
1818 | /* | |
1819 | * If the user knows better the user should set the regdom | |
1820 | * to their country before the IE is picked up | |
1821 | */ | |
1822 | if (lr->initiator == NL80211_REGDOM_SET_BY_USER && | |
1823 | lr->intersect) | |
1824 | return REG_REQ_IGNORE; | |
1825 | /* | |
1826 | * Process user requests only after previous user/driver/core | |
1827 | * requests have been processed | |
1828 | */ | |
1829 | if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE || | |
1830 | lr->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
1831 | lr->initiator == NL80211_REGDOM_SET_BY_USER) && | |
1832 | regdom_changes(lr->alpha2)) | |
1833 | return REG_REQ_IGNORE; | |
1834 | ||
1835 | if (!regdom_changes(user_request->alpha2)) | |
1836 | return REG_REQ_ALREADY_SET; | |
1837 | ||
1838 | return REG_REQ_OK; | |
1839 | } | |
1840 | ||
1841 | /** | |
1842 | * reg_process_hint_user - process user regulatory requests | |
1843 | * @user_request: a pending user regulatory request | |
1844 | * | |
1845 | * The wireless subsystem can use this function to process | |
1846 | * a regulatory request initiated by userspace. | |
1847 | * | |
1848 | * Returns one of the different reg request treatment values. | |
1849 | */ | |
1850 | static enum reg_request_treatment | |
1851 | reg_process_hint_user(struct regulatory_request *user_request) | |
1852 | { | |
1853 | enum reg_request_treatment treatment; | |
1854 | ||
1855 | treatment = __reg_process_hint_user(user_request); | |
1856 | if (treatment == REG_REQ_IGNORE || | |
1857 | treatment == REG_REQ_ALREADY_SET || | |
1858 | treatment == REG_REQ_USER_HINT_HANDLED) { | |
1859 | reg_free_request(user_request); | |
1860 | return treatment; | |
1861 | } | |
1862 | ||
1863 | user_request->intersect = treatment == REG_REQ_INTERSECT; | |
1864 | user_request->processed = false; | |
1865 | ||
1866 | reg_update_last_request(user_request); | |
1867 | ||
1868 | user_alpha2[0] = user_request->alpha2[0]; | |
1869 | user_alpha2[1] = user_request->alpha2[1]; | |
1870 | ||
1871 | return reg_call_crda(user_request); | |
1872 | } | |
1873 | ||
1874 | static enum reg_request_treatment | |
1875 | __reg_process_hint_driver(struct regulatory_request *driver_request) | |
1876 | { | |
1877 | struct regulatory_request *lr = get_last_request(); | |
1878 | ||
1879 | if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
1880 | if (regdom_changes(driver_request->alpha2)) | |
1881 | return REG_REQ_OK; | |
1882 | return REG_REQ_ALREADY_SET; | |
1883 | } | |
1884 | ||
1885 | /* | |
1886 | * This would happen if you unplug and plug your card | |
1887 | * back in or if you add a new device for which the previously | |
1888 | * loaded card also agrees on the regulatory domain. | |
1889 | */ | |
1890 | if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER && | |
1891 | !regdom_changes(driver_request->alpha2)) | |
1892 | return REG_REQ_ALREADY_SET; | |
1893 | ||
1894 | return REG_REQ_INTERSECT; | |
1895 | } | |
1896 | ||
1897 | /** | |
1898 | * reg_process_hint_driver - process driver regulatory requests | |
1899 | * @driver_request: a pending driver regulatory request | |
1900 | * | |
1901 | * The wireless subsystem can use this function to process | |
1902 | * a regulatory request issued by an 802.11 driver. | |
1903 | * | |
1904 | * Returns one of the different reg request treatment values. | |
1905 | */ | |
1906 | static enum reg_request_treatment | |
1907 | reg_process_hint_driver(struct wiphy *wiphy, | |
1908 | struct regulatory_request *driver_request) | |
1909 | { | |
1910 | const struct ieee80211_regdomain *regd; | |
1911 | enum reg_request_treatment treatment; | |
1912 | ||
1913 | treatment = __reg_process_hint_driver(driver_request); | |
1914 | ||
1915 | switch (treatment) { | |
1916 | case REG_REQ_OK: | |
1917 | break; | |
1918 | case REG_REQ_IGNORE: | |
1919 | case REG_REQ_USER_HINT_HANDLED: | |
1920 | reg_free_request(driver_request); | |
1921 | return treatment; | |
1922 | case REG_REQ_INTERSECT: | |
1923 | /* fall through */ | |
1924 | case REG_REQ_ALREADY_SET: | |
1925 | regd = reg_copy_regd(get_cfg80211_regdom()); | |
1926 | if (IS_ERR(regd)) { | |
1927 | reg_free_request(driver_request); | |
1928 | return REG_REQ_IGNORE; | |
1929 | } | |
1930 | rcu_assign_pointer(wiphy->regd, regd); | |
1931 | } | |
1932 | ||
1933 | ||
1934 | driver_request->intersect = treatment == REG_REQ_INTERSECT; | |
1935 | driver_request->processed = false; | |
1936 | ||
1937 | reg_update_last_request(driver_request); | |
1938 | ||
1939 | /* | |
1940 | * Since CRDA will not be called in this case as we already | |
1941 | * have applied the requested regulatory domain before we just | |
1942 | * inform userspace we have processed the request | |
1943 | */ | |
1944 | if (treatment == REG_REQ_ALREADY_SET) { | |
1945 | nl80211_send_reg_change_event(driver_request); | |
1946 | reg_set_request_processed(); | |
1947 | return treatment; | |
1948 | } | |
1949 | ||
1950 | return reg_call_crda(driver_request); | |
1951 | } | |
1952 | ||
1953 | static enum reg_request_treatment | |
1954 | __reg_process_hint_country_ie(struct wiphy *wiphy, | |
1955 | struct regulatory_request *country_ie_request) | |
1956 | { | |
1957 | struct wiphy *last_wiphy = NULL; | |
1958 | struct regulatory_request *lr = get_last_request(); | |
1959 | ||
1960 | if (reg_request_cell_base(lr)) { | |
1961 | /* Trust a Cell base station over the AP's country IE */ | |
1962 | if (regdom_changes(country_ie_request->alpha2)) | |
1963 | return REG_REQ_IGNORE; | |
1964 | return REG_REQ_ALREADY_SET; | |
1965 | } else { | |
1966 | if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE) | |
1967 | return REG_REQ_IGNORE; | |
1968 | } | |
1969 | ||
1970 | if (unlikely(!is_an_alpha2(country_ie_request->alpha2))) | |
1971 | return -EINVAL; | |
1972 | ||
1973 | if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
1974 | return REG_REQ_OK; | |
1975 | ||
1976 | last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx); | |
1977 | ||
1978 | if (last_wiphy != wiphy) { | |
1979 | /* | |
1980 | * Two cards with two APs claiming different | |
1981 | * Country IE alpha2s. We could | |
1982 | * intersect them, but that seems unlikely | |
1983 | * to be correct. Reject second one for now. | |
1984 | */ | |
1985 | if (regdom_changes(country_ie_request->alpha2)) | |
1986 | return REG_REQ_IGNORE; | |
1987 | return REG_REQ_ALREADY_SET; | |
1988 | } | |
1989 | /* | |
1990 | * Two consecutive Country IE hints on the same wiphy. | |
1991 | * This should be picked up early by the driver/stack | |
1992 | */ | |
1993 | if (WARN_ON(regdom_changes(country_ie_request->alpha2))) | |
1994 | return REG_REQ_OK; | |
1995 | return REG_REQ_ALREADY_SET; | |
1996 | } | |
1997 | ||
1998 | /** | |
1999 | * reg_process_hint_country_ie - process regulatory requests from country IEs | |
2000 | * @country_ie_request: a regulatory request from a country IE | |
2001 | * | |
2002 | * The wireless subsystem can use this function to process | |
2003 | * a regulatory request issued by a country Information Element. | |
2004 | * | |
2005 | * Returns one of the different reg request treatment values. | |
2006 | */ | |
2007 | static enum reg_request_treatment | |
2008 | reg_process_hint_country_ie(struct wiphy *wiphy, | |
2009 | struct regulatory_request *country_ie_request) | |
2010 | { | |
2011 | enum reg_request_treatment treatment; | |
2012 | ||
2013 | treatment = __reg_process_hint_country_ie(wiphy, country_ie_request); | |
2014 | ||
2015 | switch (treatment) { | |
2016 | case REG_REQ_OK: | |
2017 | break; | |
2018 | case REG_REQ_IGNORE: | |
2019 | case REG_REQ_USER_HINT_HANDLED: | |
2020 | /* fall through */ | |
2021 | case REG_REQ_ALREADY_SET: | |
2022 | reg_free_request(country_ie_request); | |
2023 | return treatment; | |
2024 | case REG_REQ_INTERSECT: | |
2025 | reg_free_request(country_ie_request); | |
2026 | /* | |
2027 | * This doesn't happen yet, not sure we | |
2028 | * ever want to support it for this case. | |
2029 | */ | |
2030 | WARN_ONCE(1, "Unexpected intersection for country IEs"); | |
2031 | return REG_REQ_IGNORE; | |
2032 | } | |
2033 | ||
2034 | country_ie_request->intersect = false; | |
2035 | country_ie_request->processed = false; | |
2036 | ||
2037 | reg_update_last_request(country_ie_request); | |
2038 | ||
2039 | return reg_call_crda(country_ie_request); | |
2040 | } | |
2041 | ||
2042 | /* This processes *all* regulatory hints */ | |
2043 | static void reg_process_hint(struct regulatory_request *reg_request) | |
2044 | { | |
2045 | struct wiphy *wiphy = NULL; | |
2046 | enum reg_request_treatment treatment; | |
2047 | ||
2048 | if (reg_request->wiphy_idx != WIPHY_IDX_INVALID) | |
2049 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
2050 | ||
2051 | switch (reg_request->initiator) { | |
2052 | case NL80211_REGDOM_SET_BY_CORE: | |
2053 | reg_process_hint_core(reg_request); | |
2054 | return; | |
2055 | case NL80211_REGDOM_SET_BY_USER: | |
2056 | treatment = reg_process_hint_user(reg_request); | |
2057 | if (treatment == REG_REQ_IGNORE || | |
2058 | treatment == REG_REQ_ALREADY_SET || | |
2059 | treatment == REG_REQ_USER_HINT_HANDLED) | |
2060 | return; | |
2061 | queue_delayed_work(system_power_efficient_wq, | |
2062 | ®_timeout, msecs_to_jiffies(3142)); | |
2063 | return; | |
2064 | case NL80211_REGDOM_SET_BY_DRIVER: | |
2065 | if (!wiphy) | |
2066 | goto out_free; | |
2067 | treatment = reg_process_hint_driver(wiphy, reg_request); | |
2068 | break; | |
2069 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
2070 | if (!wiphy) | |
2071 | goto out_free; | |
2072 | treatment = reg_process_hint_country_ie(wiphy, reg_request); | |
2073 | break; | |
2074 | default: | |
2075 | WARN(1, "invalid initiator %d\n", reg_request->initiator); | |
2076 | goto out_free; | |
2077 | } | |
2078 | ||
2079 | /* This is required so that the orig_* parameters are saved */ | |
2080 | if (treatment == REG_REQ_ALREADY_SET && wiphy && | |
2081 | wiphy->regulatory_flags & REGULATORY_STRICT_REG) { | |
2082 | wiphy_update_regulatory(wiphy, reg_request->initiator); | |
2083 | reg_check_channels(); | |
2084 | } | |
2085 | ||
2086 | return; | |
2087 | ||
2088 | out_free: | |
2089 | reg_free_request(reg_request); | |
2090 | } | |
2091 | ||
2092 | /* | |
2093 | * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* | |
2094 | * Regulatory hints come on a first come first serve basis and we | |
2095 | * must process each one atomically. | |
2096 | */ | |
2097 | static void reg_process_pending_hints(void) | |
2098 | { | |
2099 | struct regulatory_request *reg_request, *lr; | |
2100 | ||
2101 | lr = get_last_request(); | |
2102 | ||
2103 | /* When last_request->processed becomes true this will be rescheduled */ | |
2104 | if (lr && !lr->processed) { | |
2105 | reg_process_hint(lr); | |
2106 | return; | |
2107 | } | |
2108 | ||
2109 | spin_lock(®_requests_lock); | |
2110 | ||
2111 | if (list_empty(®_requests_list)) { | |
2112 | spin_unlock(®_requests_lock); | |
2113 | return; | |
2114 | } | |
2115 | ||
2116 | reg_request = list_first_entry(®_requests_list, | |
2117 | struct regulatory_request, | |
2118 | list); | |
2119 | list_del_init(®_request->list); | |
2120 | ||
2121 | spin_unlock(®_requests_lock); | |
2122 | ||
2123 | reg_process_hint(reg_request); | |
2124 | } | |
2125 | ||
2126 | /* Processes beacon hints -- this has nothing to do with country IEs */ | |
2127 | static void reg_process_pending_beacon_hints(void) | |
2128 | { | |
2129 | struct cfg80211_registered_device *rdev; | |
2130 | struct reg_beacon *pending_beacon, *tmp; | |
2131 | ||
2132 | /* This goes through the _pending_ beacon list */ | |
2133 | spin_lock_bh(®_pending_beacons_lock); | |
2134 | ||
2135 | list_for_each_entry_safe(pending_beacon, tmp, | |
2136 | ®_pending_beacons, list) { | |
2137 | list_del_init(&pending_beacon->list); | |
2138 | ||
2139 | /* Applies the beacon hint to current wiphys */ | |
2140 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) | |
2141 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); | |
2142 | ||
2143 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
2144 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
2145 | } | |
2146 | ||
2147 | spin_unlock_bh(®_pending_beacons_lock); | |
2148 | } | |
2149 | ||
2150 | static void reg_todo(struct work_struct *work) | |
2151 | { | |
2152 | rtnl_lock(); | |
2153 | reg_process_pending_hints(); | |
2154 | reg_process_pending_beacon_hints(); | |
2155 | rtnl_unlock(); | |
2156 | } | |
2157 | ||
2158 | static void queue_regulatory_request(struct regulatory_request *request) | |
2159 | { | |
2160 | request->alpha2[0] = toupper(request->alpha2[0]); | |
2161 | request->alpha2[1] = toupper(request->alpha2[1]); | |
2162 | ||
2163 | spin_lock(®_requests_lock); | |
2164 | list_add_tail(&request->list, ®_requests_list); | |
2165 | spin_unlock(®_requests_lock); | |
2166 | ||
2167 | schedule_work(®_work); | |
2168 | } | |
2169 | ||
2170 | /* | |
2171 | * Core regulatory hint -- happens during cfg80211_init() | |
2172 | * and when we restore regulatory settings. | |
2173 | */ | |
2174 | static int regulatory_hint_core(const char *alpha2) | |
2175 | { | |
2176 | struct regulatory_request *request; | |
2177 | ||
2178 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
2179 | if (!request) | |
2180 | return -ENOMEM; | |
2181 | ||
2182 | request->alpha2[0] = alpha2[0]; | |
2183 | request->alpha2[1] = alpha2[1]; | |
2184 | request->initiator = NL80211_REGDOM_SET_BY_CORE; | |
2185 | ||
2186 | queue_regulatory_request(request); | |
2187 | ||
2188 | return 0; | |
2189 | } | |
2190 | ||
2191 | /* User hints */ | |
2192 | int regulatory_hint_user(const char *alpha2, | |
2193 | enum nl80211_user_reg_hint_type user_reg_hint_type) | |
2194 | { | |
2195 | struct regulatory_request *request; | |
2196 | ||
2197 | if (WARN_ON(!alpha2)) | |
2198 | return -EINVAL; | |
2199 | ||
2200 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
2201 | if (!request) | |
2202 | return -ENOMEM; | |
2203 | ||
2204 | request->wiphy_idx = WIPHY_IDX_INVALID; | |
2205 | request->alpha2[0] = alpha2[0]; | |
2206 | request->alpha2[1] = alpha2[1]; | |
2207 | request->initiator = NL80211_REGDOM_SET_BY_USER; | |
2208 | request->user_reg_hint_type = user_reg_hint_type; | |
2209 | ||
2210 | queue_regulatory_request(request); | |
2211 | ||
2212 | return 0; | |
2213 | } | |
2214 | ||
2215 | int regulatory_hint_indoor_user(void) | |
2216 | { | |
2217 | struct regulatory_request *request; | |
2218 | ||
2219 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
2220 | if (!request) | |
2221 | return -ENOMEM; | |
2222 | ||
2223 | request->wiphy_idx = WIPHY_IDX_INVALID; | |
2224 | request->initiator = NL80211_REGDOM_SET_BY_USER; | |
2225 | request->user_reg_hint_type = NL80211_USER_REG_HINT_INDOOR; | |
2226 | queue_regulatory_request(request); | |
2227 | ||
2228 | return 0; | |
2229 | } | |
2230 | ||
2231 | /* Driver hints */ | |
2232 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
2233 | { | |
2234 | struct regulatory_request *request; | |
2235 | ||
2236 | if (WARN_ON(!alpha2 || !wiphy)) | |
2237 | return -EINVAL; | |
2238 | ||
2239 | wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG; | |
2240 | ||
2241 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
2242 | if (!request) | |
2243 | return -ENOMEM; | |
2244 | ||
2245 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
2246 | ||
2247 | request->alpha2[0] = alpha2[0]; | |
2248 | request->alpha2[1] = alpha2[1]; | |
2249 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; | |
2250 | ||
2251 | queue_regulatory_request(request); | |
2252 | ||
2253 | return 0; | |
2254 | } | |
2255 | EXPORT_SYMBOL(regulatory_hint); | |
2256 | ||
2257 | void regulatory_hint_country_ie(struct wiphy *wiphy, enum ieee80211_band band, | |
2258 | const u8 *country_ie, u8 country_ie_len) | |
2259 | { | |
2260 | char alpha2[2]; | |
2261 | enum environment_cap env = ENVIRON_ANY; | |
2262 | struct regulatory_request *request = NULL, *lr; | |
2263 | ||
2264 | /* IE len must be evenly divisible by 2 */ | |
2265 | if (country_ie_len & 0x01) | |
2266 | return; | |
2267 | ||
2268 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
2269 | return; | |
2270 | ||
2271 | request = kzalloc(sizeof(*request), GFP_KERNEL); | |
2272 | if (!request) | |
2273 | return; | |
2274 | ||
2275 | alpha2[0] = country_ie[0]; | |
2276 | alpha2[1] = country_ie[1]; | |
2277 | ||
2278 | if (country_ie[2] == 'I') | |
2279 | env = ENVIRON_INDOOR; | |
2280 | else if (country_ie[2] == 'O') | |
2281 | env = ENVIRON_OUTDOOR; | |
2282 | ||
2283 | rcu_read_lock(); | |
2284 | lr = get_last_request(); | |
2285 | ||
2286 | if (unlikely(!lr)) | |
2287 | goto out; | |
2288 | ||
2289 | /* | |
2290 | * We will run this only upon a successful connection on cfg80211. | |
2291 | * We leave conflict resolution to the workqueue, where can hold | |
2292 | * the RTNL. | |
2293 | */ | |
2294 | if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
2295 | lr->wiphy_idx != WIPHY_IDX_INVALID) | |
2296 | goto out; | |
2297 | ||
2298 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
2299 | request->alpha2[0] = alpha2[0]; | |
2300 | request->alpha2[1] = alpha2[1]; | |
2301 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; | |
2302 | request->country_ie_env = env; | |
2303 | ||
2304 | queue_regulatory_request(request); | |
2305 | request = NULL; | |
2306 | out: | |
2307 | kfree(request); | |
2308 | rcu_read_unlock(); | |
2309 | } | |
2310 | ||
2311 | static void restore_alpha2(char *alpha2, bool reset_user) | |
2312 | { | |
2313 | /* indicates there is no alpha2 to consider for restoration */ | |
2314 | alpha2[0] = '9'; | |
2315 | alpha2[1] = '7'; | |
2316 | ||
2317 | /* The user setting has precedence over the module parameter */ | |
2318 | if (is_user_regdom_saved()) { | |
2319 | /* Unless we're asked to ignore it and reset it */ | |
2320 | if (reset_user) { | |
2321 | REG_DBG_PRINT("Restoring regulatory settings including user preference\n"); | |
2322 | user_alpha2[0] = '9'; | |
2323 | user_alpha2[1] = '7'; | |
2324 | ||
2325 | /* | |
2326 | * If we're ignoring user settings, we still need to | |
2327 | * check the module parameter to ensure we put things | |
2328 | * back as they were for a full restore. | |
2329 | */ | |
2330 | if (!is_world_regdom(ieee80211_regdom)) { | |
2331 | REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n", | |
2332 | ieee80211_regdom[0], ieee80211_regdom[1]); | |
2333 | alpha2[0] = ieee80211_regdom[0]; | |
2334 | alpha2[1] = ieee80211_regdom[1]; | |
2335 | } | |
2336 | } else { | |
2337 | REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n", | |
2338 | user_alpha2[0], user_alpha2[1]); | |
2339 | alpha2[0] = user_alpha2[0]; | |
2340 | alpha2[1] = user_alpha2[1]; | |
2341 | } | |
2342 | } else if (!is_world_regdom(ieee80211_regdom)) { | |
2343 | REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n", | |
2344 | ieee80211_regdom[0], ieee80211_regdom[1]); | |
2345 | alpha2[0] = ieee80211_regdom[0]; | |
2346 | alpha2[1] = ieee80211_regdom[1]; | |
2347 | } else | |
2348 | REG_DBG_PRINT("Restoring regulatory settings\n"); | |
2349 | } | |
2350 | ||
2351 | static void restore_custom_reg_settings(struct wiphy *wiphy) | |
2352 | { | |
2353 | struct ieee80211_supported_band *sband; | |
2354 | enum ieee80211_band band; | |
2355 | struct ieee80211_channel *chan; | |
2356 | int i; | |
2357 | ||
2358 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
2359 | sband = wiphy->bands[band]; | |
2360 | if (!sband) | |
2361 | continue; | |
2362 | for (i = 0; i < sband->n_channels; i++) { | |
2363 | chan = &sband->channels[i]; | |
2364 | chan->flags = chan->orig_flags; | |
2365 | chan->max_antenna_gain = chan->orig_mag; | |
2366 | chan->max_power = chan->orig_mpwr; | |
2367 | chan->beacon_found = false; | |
2368 | } | |
2369 | } | |
2370 | } | |
2371 | ||
2372 | /* | |
2373 | * Restoring regulatory settings involves ingoring any | |
2374 | * possibly stale country IE information and user regulatory | |
2375 | * settings if so desired, this includes any beacon hints | |
2376 | * learned as we could have traveled outside to another country | |
2377 | * after disconnection. To restore regulatory settings we do | |
2378 | * exactly what we did at bootup: | |
2379 | * | |
2380 | * - send a core regulatory hint | |
2381 | * - send a user regulatory hint if applicable | |
2382 | * | |
2383 | * Device drivers that send a regulatory hint for a specific country | |
2384 | * keep their own regulatory domain on wiphy->regd so that does does | |
2385 | * not need to be remembered. | |
2386 | */ | |
2387 | static void restore_regulatory_settings(bool reset_user) | |
2388 | { | |
2389 | char alpha2[2]; | |
2390 | char world_alpha2[2]; | |
2391 | struct reg_beacon *reg_beacon, *btmp; | |
2392 | struct regulatory_request *reg_request, *tmp; | |
2393 | LIST_HEAD(tmp_reg_req_list); | |
2394 | struct cfg80211_registered_device *rdev; | |
2395 | ||
2396 | ASSERT_RTNL(); | |
2397 | ||
2398 | reg_is_indoor = false; | |
2399 | ||
2400 | reset_regdomains(true, &world_regdom); | |
2401 | restore_alpha2(alpha2, reset_user); | |
2402 | ||
2403 | /* | |
2404 | * If there's any pending requests we simply | |
2405 | * stash them to a temporary pending queue and | |
2406 | * add then after we've restored regulatory | |
2407 | * settings. | |
2408 | */ | |
2409 | spin_lock(®_requests_lock); | |
2410 | list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) { | |
2411 | if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER) | |
2412 | continue; | |
2413 | list_move_tail(®_request->list, &tmp_reg_req_list); | |
2414 | } | |
2415 | spin_unlock(®_requests_lock); | |
2416 | ||
2417 | /* Clear beacon hints */ | |
2418 | spin_lock_bh(®_pending_beacons_lock); | |
2419 | list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) { | |
2420 | list_del(®_beacon->list); | |
2421 | kfree(reg_beacon); | |
2422 | } | |
2423 | spin_unlock_bh(®_pending_beacons_lock); | |
2424 | ||
2425 | list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) { | |
2426 | list_del(®_beacon->list); | |
2427 | kfree(reg_beacon); | |
2428 | } | |
2429 | ||
2430 | /* First restore to the basic regulatory settings */ | |
2431 | world_alpha2[0] = cfg80211_world_regdom->alpha2[0]; | |
2432 | world_alpha2[1] = cfg80211_world_regdom->alpha2[1]; | |
2433 | ||
2434 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
2435 | if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG) | |
2436 | restore_custom_reg_settings(&rdev->wiphy); | |
2437 | } | |
2438 | ||
2439 | regulatory_hint_core(world_alpha2); | |
2440 | ||
2441 | /* | |
2442 | * This restores the ieee80211_regdom module parameter | |
2443 | * preference or the last user requested regulatory | |
2444 | * settings, user regulatory settings takes precedence. | |
2445 | */ | |
2446 | if (is_an_alpha2(alpha2)) | |
2447 | regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER); | |
2448 | ||
2449 | spin_lock(®_requests_lock); | |
2450 | list_splice_tail_init(&tmp_reg_req_list, ®_requests_list); | |
2451 | spin_unlock(®_requests_lock); | |
2452 | ||
2453 | REG_DBG_PRINT("Kicking the queue\n"); | |
2454 | ||
2455 | schedule_work(®_work); | |
2456 | } | |
2457 | ||
2458 | void regulatory_hint_disconnect(void) | |
2459 | { | |
2460 | REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n"); | |
2461 | restore_regulatory_settings(false); | |
2462 | } | |
2463 | ||
2464 | static bool freq_is_chan_12_13_14(u16 freq) | |
2465 | { | |
2466 | if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) || | |
2467 | freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) || | |
2468 | freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ)) | |
2469 | return true; | |
2470 | return false; | |
2471 | } | |
2472 | ||
2473 | static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan) | |
2474 | { | |
2475 | struct reg_beacon *pending_beacon; | |
2476 | ||
2477 | list_for_each_entry(pending_beacon, ®_pending_beacons, list) | |
2478 | if (beacon_chan->center_freq == | |
2479 | pending_beacon->chan.center_freq) | |
2480 | return true; | |
2481 | return false; | |
2482 | } | |
2483 | ||
2484 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
2485 | struct ieee80211_channel *beacon_chan, | |
2486 | gfp_t gfp) | |
2487 | { | |
2488 | struct reg_beacon *reg_beacon; | |
2489 | bool processing; | |
2490 | ||
2491 | if (beacon_chan->beacon_found || | |
2492 | beacon_chan->flags & IEEE80211_CHAN_RADAR || | |
2493 | (beacon_chan->band == IEEE80211_BAND_2GHZ && | |
2494 | !freq_is_chan_12_13_14(beacon_chan->center_freq))) | |
2495 | return 0; | |
2496 | ||
2497 | spin_lock_bh(®_pending_beacons_lock); | |
2498 | processing = pending_reg_beacon(beacon_chan); | |
2499 | spin_unlock_bh(®_pending_beacons_lock); | |
2500 | ||
2501 | if (processing) | |
2502 | return 0; | |
2503 | ||
2504 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
2505 | if (!reg_beacon) | |
2506 | return -ENOMEM; | |
2507 | ||
2508 | REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n", | |
2509 | beacon_chan->center_freq, | |
2510 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
2511 | wiphy_name(wiphy)); | |
2512 | ||
2513 | memcpy(®_beacon->chan, beacon_chan, | |
2514 | sizeof(struct ieee80211_channel)); | |
2515 | ||
2516 | /* | |
2517 | * Since we can be called from BH or and non-BH context | |
2518 | * we must use spin_lock_bh() | |
2519 | */ | |
2520 | spin_lock_bh(®_pending_beacons_lock); | |
2521 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
2522 | spin_unlock_bh(®_pending_beacons_lock); | |
2523 | ||
2524 | schedule_work(®_work); | |
2525 | ||
2526 | return 0; | |
2527 | } | |
2528 | ||
2529 | static void print_rd_rules(const struct ieee80211_regdomain *rd) | |
2530 | { | |
2531 | unsigned int i; | |
2532 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
2533 | const struct ieee80211_freq_range *freq_range = NULL; | |
2534 | const struct ieee80211_power_rule *power_rule = NULL; | |
2535 | char bw[32], cac_time[32]; | |
2536 | ||
2537 | pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n"); | |
2538 | ||
2539 | for (i = 0; i < rd->n_reg_rules; i++) { | |
2540 | reg_rule = &rd->reg_rules[i]; | |
2541 | freq_range = ®_rule->freq_range; | |
2542 | power_rule = ®_rule->power_rule; | |
2543 | ||
2544 | if (reg_rule->flags & NL80211_RRF_AUTO_BW) | |
2545 | snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO", | |
2546 | freq_range->max_bandwidth_khz, | |
2547 | reg_get_max_bandwidth(rd, reg_rule)); | |
2548 | else | |
2549 | snprintf(bw, sizeof(bw), "%d KHz", | |
2550 | freq_range->max_bandwidth_khz); | |
2551 | ||
2552 | if (reg_rule->flags & NL80211_RRF_DFS) | |
2553 | scnprintf(cac_time, sizeof(cac_time), "%u s", | |
2554 | reg_rule->dfs_cac_ms/1000); | |
2555 | else | |
2556 | scnprintf(cac_time, sizeof(cac_time), "N/A"); | |
2557 | ||
2558 | ||
2559 | /* | |
2560 | * There may not be documentation for max antenna gain | |
2561 | * in certain regions | |
2562 | */ | |
2563 | if (power_rule->max_antenna_gain) | |
2564 | pr_info(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n", | |
2565 | freq_range->start_freq_khz, | |
2566 | freq_range->end_freq_khz, | |
2567 | bw, | |
2568 | power_rule->max_antenna_gain, | |
2569 | power_rule->max_eirp, | |
2570 | cac_time); | |
2571 | else | |
2572 | pr_info(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n", | |
2573 | freq_range->start_freq_khz, | |
2574 | freq_range->end_freq_khz, | |
2575 | bw, | |
2576 | power_rule->max_eirp, | |
2577 | cac_time); | |
2578 | } | |
2579 | } | |
2580 | ||
2581 | bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region) | |
2582 | { | |
2583 | switch (dfs_region) { | |
2584 | case NL80211_DFS_UNSET: | |
2585 | case NL80211_DFS_FCC: | |
2586 | case NL80211_DFS_ETSI: | |
2587 | case NL80211_DFS_JP: | |
2588 | return true; | |
2589 | default: | |
2590 | REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n", | |
2591 | dfs_region); | |
2592 | return false; | |
2593 | } | |
2594 | } | |
2595 | ||
2596 | static void print_regdomain(const struct ieee80211_regdomain *rd) | |
2597 | { | |
2598 | struct regulatory_request *lr = get_last_request(); | |
2599 | ||
2600 | if (is_intersected_alpha2(rd->alpha2)) { | |
2601 | if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
2602 | struct cfg80211_registered_device *rdev; | |
2603 | rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx); | |
2604 | if (rdev) { | |
2605 | pr_info("Current regulatory domain updated by AP to: %c%c\n", | |
2606 | rdev->country_ie_alpha2[0], | |
2607 | rdev->country_ie_alpha2[1]); | |
2608 | } else | |
2609 | pr_info("Current regulatory domain intersected:\n"); | |
2610 | } else | |
2611 | pr_info("Current regulatory domain intersected:\n"); | |
2612 | } else if (is_world_regdom(rd->alpha2)) { | |
2613 | pr_info("World regulatory domain updated:\n"); | |
2614 | } else { | |
2615 | if (is_unknown_alpha2(rd->alpha2)) | |
2616 | pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n"); | |
2617 | else { | |
2618 | if (reg_request_cell_base(lr)) | |
2619 | pr_info("Regulatory domain changed to country: %c%c by Cell Station\n", | |
2620 | rd->alpha2[0], rd->alpha2[1]); | |
2621 | else | |
2622 | pr_info("Regulatory domain changed to country: %c%c\n", | |
2623 | rd->alpha2[0], rd->alpha2[1]); | |
2624 | } | |
2625 | } | |
2626 | ||
2627 | pr_info(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region)); | |
2628 | print_rd_rules(rd); | |
2629 | } | |
2630 | ||
2631 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) | |
2632 | { | |
2633 | pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]); | |
2634 | print_rd_rules(rd); | |
2635 | } | |
2636 | ||
2637 | static int reg_set_rd_core(const struct ieee80211_regdomain *rd) | |
2638 | { | |
2639 | if (!is_world_regdom(rd->alpha2)) | |
2640 | return -EINVAL; | |
2641 | update_world_regdomain(rd); | |
2642 | return 0; | |
2643 | } | |
2644 | ||
2645 | static int reg_set_rd_user(const struct ieee80211_regdomain *rd, | |
2646 | struct regulatory_request *user_request) | |
2647 | { | |
2648 | const struct ieee80211_regdomain *intersected_rd = NULL; | |
2649 | ||
2650 | if (!regdom_changes(rd->alpha2)) | |
2651 | return -EALREADY; | |
2652 | ||
2653 | if (!is_valid_rd(rd)) { | |
2654 | pr_err("Invalid regulatory domain detected:\n"); | |
2655 | print_regdomain_info(rd); | |
2656 | return -EINVAL; | |
2657 | } | |
2658 | ||
2659 | if (!user_request->intersect) { | |
2660 | reset_regdomains(false, rd); | |
2661 | return 0; | |
2662 | } | |
2663 | ||
2664 | intersected_rd = regdom_intersect(rd, get_cfg80211_regdom()); | |
2665 | if (!intersected_rd) | |
2666 | return -EINVAL; | |
2667 | ||
2668 | kfree(rd); | |
2669 | rd = NULL; | |
2670 | reset_regdomains(false, intersected_rd); | |
2671 | ||
2672 | return 0; | |
2673 | } | |
2674 | ||
2675 | static int reg_set_rd_driver(const struct ieee80211_regdomain *rd, | |
2676 | struct regulatory_request *driver_request) | |
2677 | { | |
2678 | const struct ieee80211_regdomain *regd; | |
2679 | const struct ieee80211_regdomain *intersected_rd = NULL; | |
2680 | const struct ieee80211_regdomain *tmp; | |
2681 | struct wiphy *request_wiphy; | |
2682 | ||
2683 | if (is_world_regdom(rd->alpha2)) | |
2684 | return -EINVAL; | |
2685 | ||
2686 | if (!regdom_changes(rd->alpha2)) | |
2687 | return -EALREADY; | |
2688 | ||
2689 | if (!is_valid_rd(rd)) { | |
2690 | pr_err("Invalid regulatory domain detected:\n"); | |
2691 | print_regdomain_info(rd); | |
2692 | return -EINVAL; | |
2693 | } | |
2694 | ||
2695 | request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx); | |
2696 | if (!request_wiphy) { | |
2697 | queue_delayed_work(system_power_efficient_wq, | |
2698 | ®_timeout, 0); | |
2699 | return -ENODEV; | |
2700 | } | |
2701 | ||
2702 | if (!driver_request->intersect) { | |
2703 | if (request_wiphy->regd) | |
2704 | return -EALREADY; | |
2705 | ||
2706 | regd = reg_copy_regd(rd); | |
2707 | if (IS_ERR(regd)) | |
2708 | return PTR_ERR(regd); | |
2709 | ||
2710 | rcu_assign_pointer(request_wiphy->regd, regd); | |
2711 | reset_regdomains(false, rd); | |
2712 | return 0; | |
2713 | } | |
2714 | ||
2715 | intersected_rd = regdom_intersect(rd, get_cfg80211_regdom()); | |
2716 | if (!intersected_rd) | |
2717 | return -EINVAL; | |
2718 | ||
2719 | /* | |
2720 | * We can trash what CRDA provided now. | |
2721 | * However if a driver requested this specific regulatory | |
2722 | * domain we keep it for its private use | |
2723 | */ | |
2724 | tmp = get_wiphy_regdom(request_wiphy); | |
2725 | rcu_assign_pointer(request_wiphy->regd, rd); | |
2726 | rcu_free_regdom(tmp); | |
2727 | ||
2728 | rd = NULL; | |
2729 | ||
2730 | reset_regdomains(false, intersected_rd); | |
2731 | ||
2732 | return 0; | |
2733 | } | |
2734 | ||
2735 | static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd, | |
2736 | struct regulatory_request *country_ie_request) | |
2737 | { | |
2738 | struct wiphy *request_wiphy; | |
2739 | ||
2740 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
2741 | !is_unknown_alpha2(rd->alpha2)) | |
2742 | return -EINVAL; | |
2743 | ||
2744 | /* | |
2745 | * Lets only bother proceeding on the same alpha2 if the current | |
2746 | * rd is non static (it means CRDA was present and was used last) | |
2747 | * and the pending request came in from a country IE | |
2748 | */ | |
2749 | ||
2750 | if (!is_valid_rd(rd)) { | |
2751 | pr_err("Invalid regulatory domain detected:\n"); | |
2752 | print_regdomain_info(rd); | |
2753 | return -EINVAL; | |
2754 | } | |
2755 | ||
2756 | request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx); | |
2757 | if (!request_wiphy) { | |
2758 | queue_delayed_work(system_power_efficient_wq, | |
2759 | ®_timeout, 0); | |
2760 | return -ENODEV; | |
2761 | } | |
2762 | ||
2763 | if (country_ie_request->intersect) | |
2764 | return -EINVAL; | |
2765 | ||
2766 | reset_regdomains(false, rd); | |
2767 | return 0; | |
2768 | } | |
2769 | ||
2770 | /* | |
2771 | * Use this call to set the current regulatory domain. Conflicts with | |
2772 | * multiple drivers can be ironed out later. Caller must've already | |
2773 | * kmalloc'd the rd structure. | |
2774 | */ | |
2775 | int set_regdom(const struct ieee80211_regdomain *rd) | |
2776 | { | |
2777 | struct regulatory_request *lr; | |
2778 | bool user_reset = false; | |
2779 | int r; | |
2780 | ||
2781 | if (!reg_is_valid_request(rd->alpha2)) { | |
2782 | kfree(rd); | |
2783 | return -EINVAL; | |
2784 | } | |
2785 | ||
2786 | lr = get_last_request(); | |
2787 | ||
2788 | /* Note that this doesn't update the wiphys, this is done below */ | |
2789 | switch (lr->initiator) { | |
2790 | case NL80211_REGDOM_SET_BY_CORE: | |
2791 | r = reg_set_rd_core(rd); | |
2792 | break; | |
2793 | case NL80211_REGDOM_SET_BY_USER: | |
2794 | r = reg_set_rd_user(rd, lr); | |
2795 | user_reset = true; | |
2796 | break; | |
2797 | case NL80211_REGDOM_SET_BY_DRIVER: | |
2798 | r = reg_set_rd_driver(rd, lr); | |
2799 | break; | |
2800 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
2801 | r = reg_set_rd_country_ie(rd, lr); | |
2802 | break; | |
2803 | default: | |
2804 | WARN(1, "invalid initiator %d\n", lr->initiator); | |
2805 | return -EINVAL; | |
2806 | } | |
2807 | ||
2808 | if (r) { | |
2809 | switch (r) { | |
2810 | case -EALREADY: | |
2811 | reg_set_request_processed(); | |
2812 | break; | |
2813 | default: | |
2814 | /* Back to world regulatory in case of errors */ | |
2815 | restore_regulatory_settings(user_reset); | |
2816 | } | |
2817 | ||
2818 | kfree(rd); | |
2819 | return r; | |
2820 | } | |
2821 | ||
2822 | /* This would make this whole thing pointless */ | |
2823 | if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom())) | |
2824 | return -EINVAL; | |
2825 | ||
2826 | /* update all wiphys now with the new established regulatory domain */ | |
2827 | update_all_wiphy_regulatory(lr->initiator); | |
2828 | ||
2829 | print_regdomain(get_cfg80211_regdom()); | |
2830 | ||
2831 | nl80211_send_reg_change_event(lr); | |
2832 | ||
2833 | reg_set_request_processed(); | |
2834 | ||
2835 | return 0; | |
2836 | } | |
2837 | ||
2838 | void wiphy_regulatory_register(struct wiphy *wiphy) | |
2839 | { | |
2840 | struct regulatory_request *lr; | |
2841 | ||
2842 | if (!reg_dev_ignore_cell_hint(wiphy)) | |
2843 | reg_num_devs_support_basehint++; | |
2844 | ||
2845 | lr = get_last_request(); | |
2846 | wiphy_update_regulatory(wiphy, lr->initiator); | |
2847 | } | |
2848 | ||
2849 | void wiphy_regulatory_deregister(struct wiphy *wiphy) | |
2850 | { | |
2851 | struct wiphy *request_wiphy = NULL; | |
2852 | struct regulatory_request *lr; | |
2853 | ||
2854 | lr = get_last_request(); | |
2855 | ||
2856 | if (!reg_dev_ignore_cell_hint(wiphy)) | |
2857 | reg_num_devs_support_basehint--; | |
2858 | ||
2859 | rcu_free_regdom(get_wiphy_regdom(wiphy)); | |
2860 | RCU_INIT_POINTER(wiphy->regd, NULL); | |
2861 | ||
2862 | if (lr) | |
2863 | request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx); | |
2864 | ||
2865 | if (!request_wiphy || request_wiphy != wiphy) | |
2866 | return; | |
2867 | ||
2868 | lr->wiphy_idx = WIPHY_IDX_INVALID; | |
2869 | lr->country_ie_env = ENVIRON_ANY; | |
2870 | } | |
2871 | ||
2872 | static void reg_timeout_work(struct work_struct *work) | |
2873 | { | |
2874 | REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n"); | |
2875 | rtnl_lock(); | |
2876 | restore_regulatory_settings(true); | |
2877 | rtnl_unlock(); | |
2878 | } | |
2879 | ||
2880 | /* | |
2881 | * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for | |
2882 | * UNII band definitions | |
2883 | */ | |
2884 | int cfg80211_get_unii(int freq) | |
2885 | { | |
2886 | /* UNII-1 */ | |
2887 | if (freq >= 5150 && freq <= 5250) | |
2888 | return 0; | |
2889 | ||
2890 | /* UNII-2A */ | |
2891 | if (freq > 5250 && freq <= 5350) | |
2892 | return 1; | |
2893 | ||
2894 | /* UNII-2B */ | |
2895 | if (freq > 5350 && freq <= 5470) | |
2896 | return 2; | |
2897 | ||
2898 | /* UNII-2C */ | |
2899 | if (freq > 5470 && freq <= 5725) | |
2900 | return 3; | |
2901 | ||
2902 | /* UNII-3 */ | |
2903 | if (freq > 5725 && freq <= 5825) | |
2904 | return 4; | |
2905 | ||
2906 | return -EINVAL; | |
2907 | } | |
2908 | ||
2909 | bool regulatory_indoor_allowed(void) | |
2910 | { | |
2911 | return reg_is_indoor; | |
2912 | } | |
2913 | ||
2914 | int __init regulatory_init(void) | |
2915 | { | |
2916 | int err = 0; | |
2917 | ||
2918 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); | |
2919 | if (IS_ERR(reg_pdev)) | |
2920 | return PTR_ERR(reg_pdev); | |
2921 | ||
2922 | spin_lock_init(®_requests_lock); | |
2923 | spin_lock_init(®_pending_beacons_lock); | |
2924 | ||
2925 | reg_regdb_size_check(); | |
2926 | ||
2927 | rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom); | |
2928 | ||
2929 | user_alpha2[0] = '9'; | |
2930 | user_alpha2[1] = '7'; | |
2931 | ||
2932 | /* We always try to get an update for the static regdomain */ | |
2933 | err = regulatory_hint_core(cfg80211_world_regdom->alpha2); | |
2934 | if (err) { | |
2935 | if (err == -ENOMEM) | |
2936 | return err; | |
2937 | /* | |
2938 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
2939 | * memory which is handled and propagated appropriately above | |
2940 | * but it can also fail during a netlink_broadcast() or during | |
2941 | * early boot for call_usermodehelper(). For now treat these | |
2942 | * errors as non-fatal. | |
2943 | */ | |
2944 | pr_err("kobject_uevent_env() was unable to call CRDA during init\n"); | |
2945 | } | |
2946 | ||
2947 | /* | |
2948 | * Finally, if the user set the module parameter treat it | |
2949 | * as a user hint. | |
2950 | */ | |
2951 | if (!is_world_regdom(ieee80211_regdom)) | |
2952 | regulatory_hint_user(ieee80211_regdom, | |
2953 | NL80211_USER_REG_HINT_USER); | |
2954 | ||
2955 | return 0; | |
2956 | } | |
2957 | ||
2958 | void regulatory_exit(void) | |
2959 | { | |
2960 | struct regulatory_request *reg_request, *tmp; | |
2961 | struct reg_beacon *reg_beacon, *btmp; | |
2962 | ||
2963 | cancel_work_sync(®_work); | |
2964 | cancel_delayed_work_sync(®_timeout); | |
2965 | cancel_delayed_work_sync(®_check_chans); | |
2966 | ||
2967 | /* Lock to suppress warnings */ | |
2968 | rtnl_lock(); | |
2969 | reset_regdomains(true, NULL); | |
2970 | rtnl_unlock(); | |
2971 | ||
2972 | dev_set_uevent_suppress(®_pdev->dev, true); | |
2973 | ||
2974 | platform_device_unregister(reg_pdev); | |
2975 | ||
2976 | list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) { | |
2977 | list_del(®_beacon->list); | |
2978 | kfree(reg_beacon); | |
2979 | } | |
2980 | ||
2981 | list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) { | |
2982 | list_del(®_beacon->list); | |
2983 | kfree(reg_beacon); | |
2984 | } | |
2985 | ||
2986 | list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) { | |
2987 | list_del(®_request->list); | |
2988 | kfree(reg_request); | |
2989 | } | |
2990 | } |