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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 | * Copyright 2017 Intel Deutschland GmbH | |
8 | * | |
9 | * Permission to use, copy, modify, and/or distribute this software for any | |
10 | * purpose with or without fee is hereby granted, provided that the above | |
11 | * copyright notice and this permission notice appear in all copies. | |
12 | * | |
13 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
14 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
15 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
16 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
17 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
18 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
19 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
20 | */ | |
21 | ||
22 | ||
23 | /** | |
24 | * DOC: Wireless regulatory infrastructure | |
25 | * | |
26 | * The usual implementation is for a driver to read a device EEPROM to | |
27 | * determine which regulatory domain it should be operating under, then | |
28 | * looking up the allowable channels in a driver-local table and finally | |
29 | * registering those channels in the wiphy structure. | |
30 | * | |
31 | * Another set of compliance enforcement is for drivers to use their | |
32 | * own compliance limits which can be stored on the EEPROM. The host | |
33 | * driver or firmware may ensure these are used. | |
34 | * | |
35 | * In addition to all this we provide an extra layer of regulatory | |
36 | * conformance. For drivers which do not have any regulatory | |
37 | * information CRDA provides the complete regulatory solution. | |
38 | * For others it provides a community effort on further restrictions | |
39 | * to enhance compliance. | |
40 | * | |
41 | * Note: When number of rules --> infinity we will not be able to | |
42 | * index on alpha2 any more, instead we'll probably have to | |
43 | * rely on some SHA1 checksum of the regdomain for example. | |
44 | * | |
45 | */ | |
46 | ||
47 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
48 | ||
49 | #include <linux/kernel.h> | |
50 | #include <linux/export.h> | |
51 | #include <linux/slab.h> | |
52 | #include <linux/list.h> | |
53 | #include <linux/ctype.h> | |
54 | #include <linux/nl80211.h> | |
55 | #include <linux/platform_device.h> | |
56 | #include <linux/verification.h> | |
57 | #include <linux/moduleparam.h> | |
58 | #include <linux/firmware.h> | |
59 | #include <net/cfg80211.h> | |
60 | #include "core.h" | |
61 | #include "reg.h" | |
62 | #include "rdev-ops.h" | |
63 | #include "nl80211.h" | |
64 | ||
65 | /* | |
66 | * Grace period we give before making sure all current interfaces reside on | |
67 | * channels allowed by the current regulatory domain. | |
68 | */ | |
69 | #define REG_ENFORCE_GRACE_MS 60000 | |
70 | ||
71 | /** | |
72 | * enum reg_request_treatment - regulatory request treatment | |
73 | * | |
74 | * @REG_REQ_OK: continue processing the regulatory request | |
75 | * @REG_REQ_IGNORE: ignore the regulatory request | |
76 | * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should | |
77 | * be intersected with the current one. | |
78 | * @REG_REQ_ALREADY_SET: the regulatory request will not change the current | |
79 | * regulatory settings, and no further processing is required. | |
80 | */ | |
81 | enum reg_request_treatment { | |
82 | REG_REQ_OK, | |
83 | REG_REQ_IGNORE, | |
84 | REG_REQ_INTERSECT, | |
85 | REG_REQ_ALREADY_SET, | |
86 | }; | |
87 | ||
88 | static struct regulatory_request core_request_world = { | |
89 | .initiator = NL80211_REGDOM_SET_BY_CORE, | |
90 | .alpha2[0] = '0', | |
91 | .alpha2[1] = '0', | |
92 | .intersect = false, | |
93 | .processed = true, | |
94 | .country_ie_env = ENVIRON_ANY, | |
95 | }; | |
96 | ||
97 | /* | |
98 | * Receipt of information from last regulatory request, | |
99 | * protected by RTNL (and can be accessed with RCU protection) | |
100 | */ | |
101 | static struct regulatory_request __rcu *last_request = | |
102 | (void __force __rcu *)&core_request_world; | |
103 | ||
104 | /* To trigger userspace events and load firmware */ | |
105 | static struct platform_device *reg_pdev; | |
106 | ||
107 | /* | |
108 | * Central wireless core regulatory domains, we only need two, | |
109 | * the current one and a world regulatory domain in case we have no | |
110 | * information to give us an alpha2. | |
111 | * (protected by RTNL, can be read under RCU) | |
112 | */ | |
113 | const struct ieee80211_regdomain __rcu *cfg80211_regdomain; | |
114 | ||
115 | /* | |
116 | * Number of devices that registered to the core | |
117 | * that support cellular base station regulatory hints | |
118 | * (protected by RTNL) | |
119 | */ | |
120 | static int reg_num_devs_support_basehint; | |
121 | ||
122 | /* | |
123 | * State variable indicating if the platform on which the devices | |
124 | * are attached is operating in an indoor environment. The state variable | |
125 | * is relevant for all registered devices. | |
126 | */ | |
127 | static bool reg_is_indoor; | |
128 | static spinlock_t reg_indoor_lock; | |
129 | ||
130 | /* Used to track the userspace process controlling the indoor setting */ | |
131 | static u32 reg_is_indoor_portid; | |
132 | ||
133 | static void restore_regulatory_settings(bool reset_user); | |
134 | ||
135 | static const struct ieee80211_regdomain *get_cfg80211_regdom(void) | |
136 | { | |
137 | return rtnl_dereference(cfg80211_regdomain); | |
138 | } | |
139 | ||
140 | const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy) | |
141 | { | |
142 | return rtnl_dereference(wiphy->regd); | |
143 | } | |
144 | ||
145 | static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region) | |
146 | { | |
147 | switch (dfs_region) { | |
148 | case NL80211_DFS_UNSET: | |
149 | return "unset"; | |
150 | case NL80211_DFS_FCC: | |
151 | return "FCC"; | |
152 | case NL80211_DFS_ETSI: | |
153 | return "ETSI"; | |
154 | case NL80211_DFS_JP: | |
155 | return "JP"; | |
156 | } | |
157 | return "Unknown"; | |
158 | } | |
159 | ||
160 | enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy) | |
161 | { | |
162 | const struct ieee80211_regdomain *regd = NULL; | |
163 | const struct ieee80211_regdomain *wiphy_regd = NULL; | |
164 | ||
165 | regd = get_cfg80211_regdom(); | |
166 | if (!wiphy) | |
167 | goto out; | |
168 | ||
169 | wiphy_regd = get_wiphy_regdom(wiphy); | |
170 | if (!wiphy_regd) | |
171 | goto out; | |
172 | ||
173 | if (wiphy_regd->dfs_region == regd->dfs_region) | |
174 | goto out; | |
175 | ||
176 | pr_debug("%s: device specific dfs_region (%s) disagrees with cfg80211's central dfs_region (%s)\n", | |
177 | dev_name(&wiphy->dev), | |
178 | reg_dfs_region_str(wiphy_regd->dfs_region), | |
179 | reg_dfs_region_str(regd->dfs_region)); | |
180 | ||
181 | out: | |
182 | return regd->dfs_region; | |
183 | } | |
184 | ||
185 | static void rcu_free_regdom(const struct ieee80211_regdomain *r) | |
186 | { | |
187 | if (!r) | |
188 | return; | |
189 | kfree_rcu((struct ieee80211_regdomain *)r, rcu_head); | |
190 | } | |
191 | ||
192 | static struct regulatory_request *get_last_request(void) | |
193 | { | |
194 | return rcu_dereference_rtnl(last_request); | |
195 | } | |
196 | ||
197 | /* Used to queue up regulatory hints */ | |
198 | static LIST_HEAD(reg_requests_list); | |
199 | static spinlock_t reg_requests_lock; | |
200 | ||
201 | /* Used to queue up beacon hints for review */ | |
202 | static LIST_HEAD(reg_pending_beacons); | |
203 | static spinlock_t reg_pending_beacons_lock; | |
204 | ||
205 | /* Used to keep track of processed beacon hints */ | |
206 | static LIST_HEAD(reg_beacon_list); | |
207 | ||
208 | struct reg_beacon { | |
209 | struct list_head list; | |
210 | struct ieee80211_channel chan; | |
211 | }; | |
212 | ||
213 | static void reg_check_chans_work(struct work_struct *work); | |
214 | static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work); | |
215 | ||
216 | static void reg_todo(struct work_struct *work); | |
217 | static DECLARE_WORK(reg_work, reg_todo); | |
218 | ||
219 | /* We keep a static world regulatory domain in case of the absence of CRDA */ | |
220 | static const struct ieee80211_regdomain world_regdom = { | |
221 | .n_reg_rules = 8, | |
222 | .alpha2 = "00", | |
223 | .reg_rules = { | |
224 | /* IEEE 802.11b/g, channels 1..11 */ | |
225 | REG_RULE(2412-10, 2462+10, 40, 6, 20, 0), | |
226 | /* IEEE 802.11b/g, channels 12..13. */ | |
227 | REG_RULE(2467-10, 2472+10, 20, 6, 20, | |
228 | NL80211_RRF_NO_IR | NL80211_RRF_AUTO_BW), | |
229 | /* IEEE 802.11 channel 14 - Only JP enables | |
230 | * this and for 802.11b only */ | |
231 | REG_RULE(2484-10, 2484+10, 20, 6, 20, | |
232 | NL80211_RRF_NO_IR | | |
233 | NL80211_RRF_NO_OFDM), | |
234 | /* IEEE 802.11a, channel 36..48 */ | |
235 | REG_RULE(5180-10, 5240+10, 80, 6, 20, | |
236 | NL80211_RRF_NO_IR | | |
237 | NL80211_RRF_AUTO_BW), | |
238 | ||
239 | /* IEEE 802.11a, channel 52..64 - DFS required */ | |
240 | REG_RULE(5260-10, 5320+10, 80, 6, 20, | |
241 | NL80211_RRF_NO_IR | | |
242 | NL80211_RRF_AUTO_BW | | |
243 | NL80211_RRF_DFS), | |
244 | ||
245 | /* IEEE 802.11a, channel 100..144 - DFS required */ | |
246 | REG_RULE(5500-10, 5720+10, 160, 6, 20, | |
247 | NL80211_RRF_NO_IR | | |
248 | NL80211_RRF_DFS), | |
249 | ||
250 | /* IEEE 802.11a, channel 149..165 */ | |
251 | REG_RULE(5745-10, 5825+10, 80, 6, 20, | |
252 | NL80211_RRF_NO_IR), | |
253 | ||
254 | /* IEEE 802.11ad (60GHz), channels 1..3 */ | |
255 | REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0), | |
256 | } | |
257 | }; | |
258 | ||
259 | /* protected by RTNL */ | |
260 | static const struct ieee80211_regdomain *cfg80211_world_regdom = | |
261 | &world_regdom; | |
262 | ||
263 | static char *ieee80211_regdom = "00"; | |
264 | static char user_alpha2[2]; | |
265 | ||
266 | module_param(ieee80211_regdom, charp, 0444); | |
267 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
268 | ||
269 | static void reg_free_request(struct regulatory_request *request) | |
270 | { | |
271 | if (request == &core_request_world) | |
272 | return; | |
273 | ||
274 | if (request != get_last_request()) | |
275 | kfree(request); | |
276 | } | |
277 | ||
278 | static void reg_free_last_request(void) | |
279 | { | |
280 | struct regulatory_request *lr = get_last_request(); | |
281 | ||
282 | if (lr != &core_request_world && lr) | |
283 | kfree_rcu(lr, rcu_head); | |
284 | } | |
285 | ||
286 | static void reg_update_last_request(struct regulatory_request *request) | |
287 | { | |
288 | struct regulatory_request *lr; | |
289 | ||
290 | lr = get_last_request(); | |
291 | if (lr == request) | |
292 | return; | |
293 | ||
294 | reg_free_last_request(); | |
295 | rcu_assign_pointer(last_request, request); | |
296 | } | |
297 | ||
298 | static void reset_regdomains(bool full_reset, | |
299 | const struct ieee80211_regdomain *new_regdom) | |
300 | { | |
301 | const struct ieee80211_regdomain *r; | |
302 | ||
303 | ASSERT_RTNL(); | |
304 | ||
305 | r = get_cfg80211_regdom(); | |
306 | ||
307 | /* avoid freeing static information or freeing something twice */ | |
308 | if (r == cfg80211_world_regdom) | |
309 | r = NULL; | |
310 | if (cfg80211_world_regdom == &world_regdom) | |
311 | cfg80211_world_regdom = NULL; | |
312 | if (r == &world_regdom) | |
313 | r = NULL; | |
314 | ||
315 | rcu_free_regdom(r); | |
316 | rcu_free_regdom(cfg80211_world_regdom); | |
317 | ||
318 | cfg80211_world_regdom = &world_regdom; | |
319 | rcu_assign_pointer(cfg80211_regdomain, new_regdom); | |
320 | ||
321 | if (!full_reset) | |
322 | return; | |
323 | ||
324 | reg_update_last_request(&core_request_world); | |
325 | } | |
326 | ||
327 | /* | |
328 | * Dynamic world regulatory domain requested by the wireless | |
329 | * core upon initialization | |
330 | */ | |
331 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) | |
332 | { | |
333 | struct regulatory_request *lr; | |
334 | ||
335 | lr = get_last_request(); | |
336 | ||
337 | WARN_ON(!lr); | |
338 | ||
339 | reset_regdomains(false, rd); | |
340 | ||
341 | cfg80211_world_regdom = rd; | |
342 | } | |
343 | ||
344 | bool is_world_regdom(const char *alpha2) | |
345 | { | |
346 | if (!alpha2) | |
347 | return false; | |
348 | return alpha2[0] == '0' && alpha2[1] == '0'; | |
349 | } | |
350 | ||
351 | static bool is_alpha2_set(const char *alpha2) | |
352 | { | |
353 | if (!alpha2) | |
354 | return false; | |
355 | return alpha2[0] && alpha2[1]; | |
356 | } | |
357 | ||
358 | static bool is_unknown_alpha2(const char *alpha2) | |
359 | { | |
360 | if (!alpha2) | |
361 | return false; | |
362 | /* | |
363 | * Special case where regulatory domain was built by driver | |
364 | * but a specific alpha2 cannot be determined | |
365 | */ | |
366 | return alpha2[0] == '9' && alpha2[1] == '9'; | |
367 | } | |
368 | ||
369 | static bool is_intersected_alpha2(const char *alpha2) | |
370 | { | |
371 | if (!alpha2) | |
372 | return false; | |
373 | /* | |
374 | * Special case where regulatory domain is the | |
375 | * result of an intersection between two regulatory domain | |
376 | * structures | |
377 | */ | |
378 | return alpha2[0] == '9' && alpha2[1] == '8'; | |
379 | } | |
380 | ||
381 | static bool is_an_alpha2(const char *alpha2) | |
382 | { | |
383 | if (!alpha2) | |
384 | return false; | |
385 | return isalpha(alpha2[0]) && isalpha(alpha2[1]); | |
386 | } | |
387 | ||
388 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) | |
389 | { | |
390 | if (!alpha2_x || !alpha2_y) | |
391 | return false; | |
392 | return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1]; | |
393 | } | |
394 | ||
395 | static bool regdom_changes(const char *alpha2) | |
396 | { | |
397 | const struct ieee80211_regdomain *r = get_cfg80211_regdom(); | |
398 | ||
399 | if (!r) | |
400 | return true; | |
401 | return !alpha2_equal(r->alpha2, alpha2); | |
402 | } | |
403 | ||
404 | /* | |
405 | * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets | |
406 | * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER | |
407 | * has ever been issued. | |
408 | */ | |
409 | static bool is_user_regdom_saved(void) | |
410 | { | |
411 | if (user_alpha2[0] == '9' && user_alpha2[1] == '7') | |
412 | return false; | |
413 | ||
414 | /* This would indicate a mistake on the design */ | |
415 | if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2), | |
416 | "Unexpected user alpha2: %c%c\n", | |
417 | user_alpha2[0], user_alpha2[1])) | |
418 | return false; | |
419 | ||
420 | return true; | |
421 | } | |
422 | ||
423 | static const struct ieee80211_regdomain * | |
424 | reg_copy_regd(const struct ieee80211_regdomain *src_regd) | |
425 | { | |
426 | struct ieee80211_regdomain *regd; | |
427 | int size_of_regd; | |
428 | unsigned int i; | |
429 | ||
430 | size_of_regd = | |
431 | sizeof(struct ieee80211_regdomain) + | |
432 | src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule); | |
433 | ||
434 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
435 | if (!regd) | |
436 | return ERR_PTR(-ENOMEM); | |
437 | ||
438 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
439 | ||
440 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
441 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
442 | sizeof(struct ieee80211_reg_rule)); | |
443 | ||
444 | return regd; | |
445 | } | |
446 | ||
447 | struct reg_regdb_apply_request { | |
448 | struct list_head list; | |
449 | const struct ieee80211_regdomain *regdom; | |
450 | }; | |
451 | ||
452 | static LIST_HEAD(reg_regdb_apply_list); | |
453 | static DEFINE_MUTEX(reg_regdb_apply_mutex); | |
454 | ||
455 | static void reg_regdb_apply(struct work_struct *work) | |
456 | { | |
457 | struct reg_regdb_apply_request *request; | |
458 | ||
459 | rtnl_lock(); | |
460 | ||
461 | mutex_lock(®_regdb_apply_mutex); | |
462 | while (!list_empty(®_regdb_apply_list)) { | |
463 | request = list_first_entry(®_regdb_apply_list, | |
464 | struct reg_regdb_apply_request, | |
465 | list); | |
466 | list_del(&request->list); | |
467 | ||
468 | set_regdom(request->regdom, REGD_SOURCE_INTERNAL_DB); | |
469 | kfree(request); | |
470 | } | |
471 | mutex_unlock(®_regdb_apply_mutex); | |
472 | ||
473 | rtnl_unlock(); | |
474 | } | |
475 | ||
476 | static DECLARE_WORK(reg_regdb_work, reg_regdb_apply); | |
477 | ||
478 | static int reg_schedule_apply(const struct ieee80211_regdomain *regdom) | |
479 | { | |
480 | struct reg_regdb_apply_request *request; | |
481 | ||
482 | request = kzalloc(sizeof(struct reg_regdb_apply_request), GFP_KERNEL); | |
483 | if (!request) { | |
484 | kfree(regdom); | |
485 | return -ENOMEM; | |
486 | } | |
487 | ||
488 | request->regdom = regdom; | |
489 | ||
490 | mutex_lock(®_regdb_apply_mutex); | |
491 | list_add_tail(&request->list, ®_regdb_apply_list); | |
492 | mutex_unlock(®_regdb_apply_mutex); | |
493 | ||
494 | schedule_work(®_regdb_work); | |
495 | return 0; | |
496 | } | |
497 | ||
498 | #ifdef CONFIG_CFG80211_CRDA_SUPPORT | |
499 | /* Max number of consecutive attempts to communicate with CRDA */ | |
500 | #define REG_MAX_CRDA_TIMEOUTS 10 | |
501 | ||
502 | static u32 reg_crda_timeouts; | |
503 | ||
504 | static void crda_timeout_work(struct work_struct *work); | |
505 | static DECLARE_DELAYED_WORK(crda_timeout, crda_timeout_work); | |
506 | ||
507 | static void crda_timeout_work(struct work_struct *work) | |
508 | { | |
509 | pr_debug("Timeout while waiting for CRDA to reply, restoring regulatory settings\n"); | |
510 | rtnl_lock(); | |
511 | reg_crda_timeouts++; | |
512 | restore_regulatory_settings(true); | |
513 | rtnl_unlock(); | |
514 | } | |
515 | ||
516 | static void cancel_crda_timeout(void) | |
517 | { | |
518 | cancel_delayed_work(&crda_timeout); | |
519 | } | |
520 | ||
521 | static void cancel_crda_timeout_sync(void) | |
522 | { | |
523 | cancel_delayed_work_sync(&crda_timeout); | |
524 | } | |
525 | ||
526 | static void reset_crda_timeouts(void) | |
527 | { | |
528 | reg_crda_timeouts = 0; | |
529 | } | |
530 | ||
531 | /* | |
532 | * This lets us keep regulatory code which is updated on a regulatory | |
533 | * basis in userspace. | |
534 | */ | |
535 | static int call_crda(const char *alpha2) | |
536 | { | |
537 | char country[12]; | |
538 | char *env[] = { country, NULL }; | |
539 | int ret; | |
540 | ||
541 | snprintf(country, sizeof(country), "COUNTRY=%c%c", | |
542 | alpha2[0], alpha2[1]); | |
543 | ||
544 | if (reg_crda_timeouts > REG_MAX_CRDA_TIMEOUTS) { | |
545 | pr_debug("Exceeded CRDA call max attempts. Not calling CRDA\n"); | |
546 | return -EINVAL; | |
547 | } | |
548 | ||
549 | if (!is_world_regdom((char *) alpha2)) | |
550 | pr_debug("Calling CRDA for country: %c%c\n", | |
551 | alpha2[0], alpha2[1]); | |
552 | else | |
553 | pr_debug("Calling CRDA to update world regulatory domain\n"); | |
554 | ||
555 | ret = kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, env); | |
556 | if (ret) | |
557 | return ret; | |
558 | ||
559 | queue_delayed_work(system_power_efficient_wq, | |
560 | &crda_timeout, msecs_to_jiffies(3142)); | |
561 | return 0; | |
562 | } | |
563 | #else | |
564 | static inline void cancel_crda_timeout(void) {} | |
565 | static inline void cancel_crda_timeout_sync(void) {} | |
566 | static inline void reset_crda_timeouts(void) {} | |
567 | static inline int call_crda(const char *alpha2) | |
568 | { | |
569 | return -ENODATA; | |
570 | } | |
571 | #endif /* CONFIG_CFG80211_CRDA_SUPPORT */ | |
572 | ||
573 | /* code to directly load a firmware database through request_firmware */ | |
574 | static const struct fwdb_header *regdb; | |
575 | ||
576 | struct fwdb_country { | |
577 | u8 alpha2[2]; | |
578 | __be16 coll_ptr; | |
579 | /* this struct cannot be extended */ | |
580 | } __packed __aligned(4); | |
581 | ||
582 | struct fwdb_collection { | |
583 | u8 len; | |
584 | u8 n_rules; | |
585 | u8 dfs_region; | |
586 | /* no optional data yet */ | |
587 | /* aligned to 2, then followed by __be16 array of rule pointers */ | |
588 | } __packed __aligned(4); | |
589 | ||
590 | enum fwdb_flags { | |
591 | FWDB_FLAG_NO_OFDM = BIT(0), | |
592 | FWDB_FLAG_NO_OUTDOOR = BIT(1), | |
593 | FWDB_FLAG_DFS = BIT(2), | |
594 | FWDB_FLAG_NO_IR = BIT(3), | |
595 | FWDB_FLAG_AUTO_BW = BIT(4), | |
596 | }; | |
597 | ||
598 | struct fwdb_rule { | |
599 | u8 len; | |
600 | u8 flags; | |
601 | __be16 max_eirp; | |
602 | __be32 start, end, max_bw; | |
603 | /* start of optional data */ | |
604 | __be16 cac_timeout; | |
605 | } __packed __aligned(4); | |
606 | ||
607 | #define FWDB_MAGIC 0x52474442 | |
608 | #define FWDB_VERSION 20 | |
609 | ||
610 | struct fwdb_header { | |
611 | __be32 magic; | |
612 | __be32 version; | |
613 | struct fwdb_country country[]; | |
614 | } __packed __aligned(4); | |
615 | ||
616 | static bool valid_rule(const u8 *data, unsigned int size, u16 rule_ptr) | |
617 | { | |
618 | struct fwdb_rule *rule = (void *)(data + (rule_ptr << 2)); | |
619 | ||
620 | if ((u8 *)rule + sizeof(rule->len) > data + size) | |
621 | return false; | |
622 | ||
623 | /* mandatory fields */ | |
624 | if (rule->len < offsetofend(struct fwdb_rule, max_bw)) | |
625 | return false; | |
626 | ||
627 | return true; | |
628 | } | |
629 | ||
630 | static bool valid_country(const u8 *data, unsigned int size, | |
631 | const struct fwdb_country *country) | |
632 | { | |
633 | unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2; | |
634 | struct fwdb_collection *coll = (void *)(data + ptr); | |
635 | __be16 *rules_ptr; | |
636 | unsigned int i; | |
637 | ||
638 | /* make sure we can read len/n_rules */ | |
639 | if ((u8 *)coll + offsetofend(typeof(*coll), n_rules) > data + size) | |
640 | return false; | |
641 | ||
642 | /* make sure base struct and all rules fit */ | |
643 | if ((u8 *)coll + ALIGN(coll->len, 2) + | |
644 | (coll->n_rules * 2) > data + size) | |
645 | return false; | |
646 | ||
647 | /* mandatory fields must exist */ | |
648 | if (coll->len < offsetofend(struct fwdb_collection, dfs_region)) | |
649 | return false; | |
650 | ||
651 | rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2)); | |
652 | ||
653 | for (i = 0; i < coll->n_rules; i++) { | |
654 | u16 rule_ptr = be16_to_cpu(rules_ptr[i]); | |
655 | ||
656 | if (!valid_rule(data, size, rule_ptr)) | |
657 | return false; | |
658 | } | |
659 | ||
660 | return true; | |
661 | } | |
662 | ||
663 | #ifdef CONFIG_CFG80211_REQUIRE_SIGNED_REGDB | |
664 | static struct key *builtin_regdb_keys; | |
665 | ||
666 | static void __init load_keys_from_buffer(const u8 *p, unsigned int buflen) | |
667 | { | |
668 | const u8 *end = p + buflen; | |
669 | size_t plen; | |
670 | key_ref_t key; | |
671 | ||
672 | while (p < end) { | |
673 | /* Each cert begins with an ASN.1 SEQUENCE tag and must be more | |
674 | * than 256 bytes in size. | |
675 | */ | |
676 | if (end - p < 4) | |
677 | goto dodgy_cert; | |
678 | if (p[0] != 0x30 && | |
679 | p[1] != 0x82) | |
680 | goto dodgy_cert; | |
681 | plen = (p[2] << 8) | p[3]; | |
682 | plen += 4; | |
683 | if (plen > end - p) | |
684 | goto dodgy_cert; | |
685 | ||
686 | key = key_create_or_update(make_key_ref(builtin_regdb_keys, 1), | |
687 | "asymmetric", NULL, p, plen, | |
688 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
689 | KEY_USR_VIEW | KEY_USR_READ), | |
690 | KEY_ALLOC_NOT_IN_QUOTA | | |
691 | KEY_ALLOC_BUILT_IN | | |
692 | KEY_ALLOC_BYPASS_RESTRICTION); | |
693 | if (IS_ERR(key)) { | |
694 | pr_err("Problem loading in-kernel X.509 certificate (%ld)\n", | |
695 | PTR_ERR(key)); | |
696 | } else { | |
697 | pr_notice("Loaded X.509 cert '%s'\n", | |
698 | key_ref_to_ptr(key)->description); | |
699 | key_ref_put(key); | |
700 | } | |
701 | p += plen; | |
702 | } | |
703 | ||
704 | return; | |
705 | ||
706 | dodgy_cert: | |
707 | pr_err("Problem parsing in-kernel X.509 certificate list\n"); | |
708 | } | |
709 | ||
710 | static int __init load_builtin_regdb_keys(void) | |
711 | { | |
712 | builtin_regdb_keys = | |
713 | keyring_alloc(".builtin_regdb_keys", | |
714 | KUIDT_INIT(0), KGIDT_INIT(0), current_cred(), | |
715 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
716 | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH), | |
717 | KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL); | |
718 | if (IS_ERR(builtin_regdb_keys)) | |
719 | return PTR_ERR(builtin_regdb_keys); | |
720 | ||
721 | pr_notice("Loading compiled-in X.509 certificates for regulatory database\n"); | |
722 | ||
723 | #ifdef CONFIG_CFG80211_USE_KERNEL_REGDB_KEYS | |
724 | load_keys_from_buffer(shipped_regdb_certs, shipped_regdb_certs_len); | |
725 | #endif | |
726 | #ifdef CONFIG_CFG80211_EXTRA_REGDB_KEYDIR | |
727 | if (CONFIG_CFG80211_EXTRA_REGDB_KEYDIR[0] != '\0') | |
728 | load_keys_from_buffer(extra_regdb_certs, extra_regdb_certs_len); | |
729 | #endif | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | static bool regdb_has_valid_signature(const u8 *data, unsigned int size) | |
735 | { | |
736 | const struct firmware *sig; | |
737 | bool result; | |
738 | ||
739 | if (request_firmware(&sig, "regulatory.db.p7s", ®_pdev->dev)) | |
740 | return false; | |
741 | ||
742 | result = verify_pkcs7_signature(data, size, sig->data, sig->size, | |
743 | builtin_regdb_keys, | |
744 | VERIFYING_UNSPECIFIED_SIGNATURE, | |
745 | NULL, NULL) == 0; | |
746 | ||
747 | release_firmware(sig); | |
748 | ||
749 | return result; | |
750 | } | |
751 | ||
752 | static void free_regdb_keyring(void) | |
753 | { | |
754 | key_put(builtin_regdb_keys); | |
755 | } | |
756 | #else | |
757 | static int load_builtin_regdb_keys(void) | |
758 | { | |
759 | return 0; | |
760 | } | |
761 | ||
762 | static bool regdb_has_valid_signature(const u8 *data, unsigned int size) | |
763 | { | |
764 | return true; | |
765 | } | |
766 | ||
767 | static void free_regdb_keyring(void) | |
768 | { | |
769 | } | |
770 | #endif /* CONFIG_CFG80211_REQUIRE_SIGNED_REGDB */ | |
771 | ||
772 | static bool valid_regdb(const u8 *data, unsigned int size) | |
773 | { | |
774 | const struct fwdb_header *hdr = (void *)data; | |
775 | const struct fwdb_country *country; | |
776 | ||
777 | if (size < sizeof(*hdr)) | |
778 | return false; | |
779 | ||
780 | if (hdr->magic != cpu_to_be32(FWDB_MAGIC)) | |
781 | return false; | |
782 | ||
783 | if (hdr->version != cpu_to_be32(FWDB_VERSION)) | |
784 | return false; | |
785 | ||
786 | if (!regdb_has_valid_signature(data, size)) | |
787 | return false; | |
788 | ||
789 | country = &hdr->country[0]; | |
790 | while ((u8 *)(country + 1) <= data + size) { | |
791 | if (!country->coll_ptr) | |
792 | break; | |
793 | if (!valid_country(data, size, country)) | |
794 | return false; | |
795 | country++; | |
796 | } | |
797 | ||
798 | return true; | |
799 | } | |
800 | ||
801 | static int regdb_query_country(const struct fwdb_header *db, | |
802 | const struct fwdb_country *country) | |
803 | { | |
804 | unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2; | |
805 | struct fwdb_collection *coll = (void *)((u8 *)db + ptr); | |
806 | struct ieee80211_regdomain *regdom; | |
807 | unsigned int size_of_regd; | |
808 | unsigned int i; | |
809 | ||
810 | size_of_regd = | |
811 | sizeof(struct ieee80211_regdomain) + | |
812 | coll->n_rules * sizeof(struct ieee80211_reg_rule); | |
813 | ||
814 | regdom = kzalloc(size_of_regd, GFP_KERNEL); | |
815 | if (!regdom) | |
816 | return -ENOMEM; | |
817 | ||
818 | regdom->n_reg_rules = coll->n_rules; | |
819 | regdom->alpha2[0] = country->alpha2[0]; | |
820 | regdom->alpha2[1] = country->alpha2[1]; | |
821 | regdom->dfs_region = coll->dfs_region; | |
822 | ||
823 | for (i = 0; i < regdom->n_reg_rules; i++) { | |
824 | __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2)); | |
825 | unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2; | |
826 | struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr); | |
827 | struct ieee80211_reg_rule *rrule = ®dom->reg_rules[i]; | |
828 | ||
829 | rrule->freq_range.start_freq_khz = be32_to_cpu(rule->start); | |
830 | rrule->freq_range.end_freq_khz = be32_to_cpu(rule->end); | |
831 | rrule->freq_range.max_bandwidth_khz = be32_to_cpu(rule->max_bw); | |
832 | ||
833 | rrule->power_rule.max_antenna_gain = 0; | |
834 | rrule->power_rule.max_eirp = be16_to_cpu(rule->max_eirp); | |
835 | ||
836 | rrule->flags = 0; | |
837 | if (rule->flags & FWDB_FLAG_NO_OFDM) | |
838 | rrule->flags |= NL80211_RRF_NO_OFDM; | |
839 | if (rule->flags & FWDB_FLAG_NO_OUTDOOR) | |
840 | rrule->flags |= NL80211_RRF_NO_OUTDOOR; | |
841 | if (rule->flags & FWDB_FLAG_DFS) | |
842 | rrule->flags |= NL80211_RRF_DFS; | |
843 | if (rule->flags & FWDB_FLAG_NO_IR) | |
844 | rrule->flags |= NL80211_RRF_NO_IR; | |
845 | if (rule->flags & FWDB_FLAG_AUTO_BW) | |
846 | rrule->flags |= NL80211_RRF_AUTO_BW; | |
847 | ||
848 | rrule->dfs_cac_ms = 0; | |
849 | ||
850 | /* handle optional data */ | |
851 | if (rule->len >= offsetofend(struct fwdb_rule, cac_timeout)) | |
852 | rrule->dfs_cac_ms = | |
853 | 1000 * be16_to_cpu(rule->cac_timeout); | |
854 | } | |
855 | ||
856 | return reg_schedule_apply(regdom); | |
857 | } | |
858 | ||
859 | static int query_regdb(const char *alpha2) | |
860 | { | |
861 | const struct fwdb_header *hdr = regdb; | |
862 | const struct fwdb_country *country; | |
863 | ||
864 | ASSERT_RTNL(); | |
865 | ||
866 | if (IS_ERR(regdb)) | |
867 | return PTR_ERR(regdb); | |
868 | ||
869 | country = &hdr->country[0]; | |
870 | while (country->coll_ptr) { | |
871 | if (alpha2_equal(alpha2, country->alpha2)) | |
872 | return regdb_query_country(regdb, country); | |
873 | country++; | |
874 | } | |
875 | ||
876 | return -ENODATA; | |
877 | } | |
878 | ||
879 | static void regdb_fw_cb(const struct firmware *fw, void *context) | |
880 | { | |
881 | int set_error = 0; | |
882 | bool restore = true; | |
883 | void *db; | |
884 | ||
885 | if (!fw) { | |
886 | pr_info("failed to load regulatory.db\n"); | |
887 | set_error = -ENODATA; | |
888 | } else if (!valid_regdb(fw->data, fw->size)) { | |
889 | pr_info("loaded regulatory.db is malformed or signature is missing/invalid\n"); | |
890 | set_error = -EINVAL; | |
891 | } | |
892 | ||
893 | rtnl_lock(); | |
894 | if (WARN_ON(regdb && !IS_ERR(regdb))) { | |
895 | /* just restore and free new db */ | |
896 | } else if (set_error) { | |
897 | regdb = ERR_PTR(set_error); | |
898 | } else if (fw) { | |
899 | db = kmemdup(fw->data, fw->size, GFP_KERNEL); | |
900 | if (db) { | |
901 | regdb = db; | |
902 | restore = context && query_regdb(context); | |
903 | } else { | |
904 | restore = true; | |
905 | } | |
906 | } | |
907 | ||
908 | if (restore) | |
909 | restore_regulatory_settings(true); | |
910 | ||
911 | rtnl_unlock(); | |
912 | ||
913 | kfree(context); | |
914 | ||
915 | release_firmware(fw); | |
916 | } | |
917 | ||
918 | static int query_regdb_file(const char *alpha2) | |
919 | { | |
920 | ASSERT_RTNL(); | |
921 | ||
922 | if (regdb) | |
923 | return query_regdb(alpha2); | |
924 | ||
925 | alpha2 = kmemdup(alpha2, 2, GFP_KERNEL); | |
926 | if (!alpha2) | |
927 | return -ENOMEM; | |
928 | ||
929 | return request_firmware_nowait(THIS_MODULE, true, "regulatory.db", | |
930 | ®_pdev->dev, GFP_KERNEL, | |
931 | (void *)alpha2, regdb_fw_cb); | |
932 | } | |
933 | ||
934 | int reg_reload_regdb(void) | |
935 | { | |
936 | const struct firmware *fw; | |
937 | void *db; | |
938 | int err; | |
939 | ||
940 | err = request_firmware(&fw, "regulatory.db", ®_pdev->dev); | |
941 | if (err) | |
942 | return err; | |
943 | ||
944 | if (!valid_regdb(fw->data, fw->size)) { | |
945 | err = -ENODATA; | |
946 | goto out; | |
947 | } | |
948 | ||
949 | db = kmemdup(fw->data, fw->size, GFP_KERNEL); | |
950 | if (!db) { | |
951 | err = -ENOMEM; | |
952 | goto out; | |
953 | } | |
954 | ||
955 | rtnl_lock(); | |
956 | if (!IS_ERR_OR_NULL(regdb)) | |
957 | kfree(regdb); | |
958 | regdb = db; | |
959 | rtnl_unlock(); | |
960 | ||
961 | out: | |
962 | release_firmware(fw); | |
963 | return err; | |
964 | } | |
965 | ||
966 | static bool reg_query_database(struct regulatory_request *request) | |
967 | { | |
968 | if (query_regdb_file(request->alpha2) == 0) | |
969 | return true; | |
970 | ||
971 | if (call_crda(request->alpha2) == 0) | |
972 | return true; | |
973 | ||
974 | return false; | |
975 | } | |
976 | ||
977 | bool reg_is_valid_request(const char *alpha2) | |
978 | { | |
979 | struct regulatory_request *lr = get_last_request(); | |
980 | ||
981 | if (!lr || lr->processed) | |
982 | return false; | |
983 | ||
984 | return alpha2_equal(lr->alpha2, alpha2); | |
985 | } | |
986 | ||
987 | static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy) | |
988 | { | |
989 | struct regulatory_request *lr = get_last_request(); | |
990 | ||
991 | /* | |
992 | * Follow the driver's regulatory domain, if present, unless a country | |
993 | * IE has been processed or a user wants to help complaince further | |
994 | */ | |
995 | if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
996 | lr->initiator != NL80211_REGDOM_SET_BY_USER && | |
997 | wiphy->regd) | |
998 | return get_wiphy_regdom(wiphy); | |
999 | ||
1000 | return get_cfg80211_regdom(); | |
1001 | } | |
1002 | ||
1003 | static unsigned int | |
1004 | reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd, | |
1005 | const struct ieee80211_reg_rule *rule) | |
1006 | { | |
1007 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; | |
1008 | const struct ieee80211_freq_range *freq_range_tmp; | |
1009 | const struct ieee80211_reg_rule *tmp; | |
1010 | u32 start_freq, end_freq, idx, no; | |
1011 | ||
1012 | for (idx = 0; idx < rd->n_reg_rules; idx++) | |
1013 | if (rule == &rd->reg_rules[idx]) | |
1014 | break; | |
1015 | ||
1016 | if (idx == rd->n_reg_rules) | |
1017 | return 0; | |
1018 | ||
1019 | /* get start_freq */ | |
1020 | no = idx; | |
1021 | ||
1022 | while (no) { | |
1023 | tmp = &rd->reg_rules[--no]; | |
1024 | freq_range_tmp = &tmp->freq_range; | |
1025 | ||
1026 | if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz) | |
1027 | break; | |
1028 | ||
1029 | freq_range = freq_range_tmp; | |
1030 | } | |
1031 | ||
1032 | start_freq = freq_range->start_freq_khz; | |
1033 | ||
1034 | /* get end_freq */ | |
1035 | freq_range = &rule->freq_range; | |
1036 | no = idx; | |
1037 | ||
1038 | while (no < rd->n_reg_rules - 1) { | |
1039 | tmp = &rd->reg_rules[++no]; | |
1040 | freq_range_tmp = &tmp->freq_range; | |
1041 | ||
1042 | if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz) | |
1043 | break; | |
1044 | ||
1045 | freq_range = freq_range_tmp; | |
1046 | } | |
1047 | ||
1048 | end_freq = freq_range->end_freq_khz; | |
1049 | ||
1050 | return end_freq - start_freq; | |
1051 | } | |
1052 | ||
1053 | unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd, | |
1054 | const struct ieee80211_reg_rule *rule) | |
1055 | { | |
1056 | unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule); | |
1057 | ||
1058 | if (rule->flags & NL80211_RRF_NO_160MHZ) | |
1059 | bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80)); | |
1060 | if (rule->flags & NL80211_RRF_NO_80MHZ) | |
1061 | bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40)); | |
1062 | ||
1063 | /* | |
1064 | * HT40+/HT40- limits are handled per-channel. Only limit BW if both | |
1065 | * are not allowed. | |
1066 | */ | |
1067 | if (rule->flags & NL80211_RRF_NO_HT40MINUS && | |
1068 | rule->flags & NL80211_RRF_NO_HT40PLUS) | |
1069 | bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20)); | |
1070 | ||
1071 | return bw; | |
1072 | } | |
1073 | ||
1074 | /* Sanity check on a regulatory rule */ | |
1075 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) | |
1076 | { | |
1077 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; | |
1078 | u32 freq_diff; | |
1079 | ||
1080 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) | |
1081 | return false; | |
1082 | ||
1083 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
1084 | return false; | |
1085 | ||
1086 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
1087 | ||
1088 | if (freq_range->end_freq_khz <= freq_range->start_freq_khz || | |
1089 | freq_range->max_bandwidth_khz > freq_diff) | |
1090 | return false; | |
1091 | ||
1092 | return true; | |
1093 | } | |
1094 | ||
1095 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) | |
1096 | { | |
1097 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1098 | unsigned int i; | |
1099 | ||
1100 | if (!rd->n_reg_rules) | |
1101 | return false; | |
1102 | ||
1103 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) | |
1104 | return false; | |
1105 | ||
1106 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1107 | reg_rule = &rd->reg_rules[i]; | |
1108 | if (!is_valid_reg_rule(reg_rule)) | |
1109 | return false; | |
1110 | } | |
1111 | ||
1112 | return true; | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
1117 | * @freq_range: frequency rule we want to query | |
1118 | * @freq_khz: frequency we are inquiring about | |
1119 | * | |
1120 | * This lets us know if a specific frequency rule is or is not relevant to | |
1121 | * a specific frequency's band. Bands are device specific and artificial | |
1122 | * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"), | |
1123 | * however it is safe for now to assume that a frequency rule should not be | |
1124 | * part of a frequency's band if the start freq or end freq are off by more | |
1125 | * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 20 GHz for the | |
1126 | * 60 GHz band. | |
1127 | * This resolution can be lowered and should be considered as we add | |
1128 | * regulatory rule support for other "bands". | |
1129 | **/ | |
1130 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
1131 | u32 freq_khz) | |
1132 | { | |
1133 | #define ONE_GHZ_IN_KHZ 1000000 | |
1134 | /* | |
1135 | * From 802.11ad: directional multi-gigabit (DMG): | |
1136 | * Pertaining to operation in a frequency band containing a channel | |
1137 | * with the Channel starting frequency above 45 GHz. | |
1138 | */ | |
1139 | u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ? | |
1140 | 20 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ; | |
1141 | if (abs(freq_khz - freq_range->start_freq_khz) <= limit) | |
1142 | return true; | |
1143 | if (abs(freq_khz - freq_range->end_freq_khz) <= limit) | |
1144 | return true; | |
1145 | return false; | |
1146 | #undef ONE_GHZ_IN_KHZ | |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * Later on we can perhaps use the more restrictive DFS | |
1151 | * region but we don't have information for that yet so | |
1152 | * for now simply disallow conflicts. | |
1153 | */ | |
1154 | static enum nl80211_dfs_regions | |
1155 | reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1, | |
1156 | const enum nl80211_dfs_regions dfs_region2) | |
1157 | { | |
1158 | if (dfs_region1 != dfs_region2) | |
1159 | return NL80211_DFS_UNSET; | |
1160 | return dfs_region1; | |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * Helper for regdom_intersect(), this does the real | |
1165 | * mathematical intersection fun | |
1166 | */ | |
1167 | static int reg_rules_intersect(const struct ieee80211_regdomain *rd1, | |
1168 | const struct ieee80211_regdomain *rd2, | |
1169 | const struct ieee80211_reg_rule *rule1, | |
1170 | const struct ieee80211_reg_rule *rule2, | |
1171 | struct ieee80211_reg_rule *intersected_rule) | |
1172 | { | |
1173 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
1174 | struct ieee80211_freq_range *freq_range; | |
1175 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
1176 | struct ieee80211_power_rule *power_rule; | |
1177 | u32 freq_diff, max_bandwidth1, max_bandwidth2; | |
1178 | ||
1179 | freq_range1 = &rule1->freq_range; | |
1180 | freq_range2 = &rule2->freq_range; | |
1181 | freq_range = &intersected_rule->freq_range; | |
1182 | ||
1183 | power_rule1 = &rule1->power_rule; | |
1184 | power_rule2 = &rule2->power_rule; | |
1185 | power_rule = &intersected_rule->power_rule; | |
1186 | ||
1187 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
1188 | freq_range2->start_freq_khz); | |
1189 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
1190 | freq_range2->end_freq_khz); | |
1191 | ||
1192 | max_bandwidth1 = freq_range1->max_bandwidth_khz; | |
1193 | max_bandwidth2 = freq_range2->max_bandwidth_khz; | |
1194 | ||
1195 | if (rule1->flags & NL80211_RRF_AUTO_BW) | |
1196 | max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1); | |
1197 | if (rule2->flags & NL80211_RRF_AUTO_BW) | |
1198 | max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2); | |
1199 | ||
1200 | freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2); | |
1201 | ||
1202 | intersected_rule->flags = rule1->flags | rule2->flags; | |
1203 | ||
1204 | /* | |
1205 | * In case NL80211_RRF_AUTO_BW requested for both rules | |
1206 | * set AUTO_BW in intersected rule also. Next we will | |
1207 | * calculate BW correctly in handle_channel function. | |
1208 | * In other case remove AUTO_BW flag while we calculate | |
1209 | * maximum bandwidth correctly and auto calculation is | |
1210 | * not required. | |
1211 | */ | |
1212 | if ((rule1->flags & NL80211_RRF_AUTO_BW) && | |
1213 | (rule2->flags & NL80211_RRF_AUTO_BW)) | |
1214 | intersected_rule->flags |= NL80211_RRF_AUTO_BW; | |
1215 | else | |
1216 | intersected_rule->flags &= ~NL80211_RRF_AUTO_BW; | |
1217 | ||
1218 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
1219 | if (freq_range->max_bandwidth_khz > freq_diff) | |
1220 | freq_range->max_bandwidth_khz = freq_diff; | |
1221 | ||
1222 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
1223 | power_rule2->max_eirp); | |
1224 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
1225 | power_rule2->max_antenna_gain); | |
1226 | ||
1227 | intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms, | |
1228 | rule2->dfs_cac_ms); | |
1229 | ||
1230 | if (!is_valid_reg_rule(intersected_rule)) | |
1231 | return -EINVAL; | |
1232 | ||
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | /* check whether old rule contains new rule */ | |
1237 | static bool rule_contains(struct ieee80211_reg_rule *r1, | |
1238 | struct ieee80211_reg_rule *r2) | |
1239 | { | |
1240 | /* for simplicity, currently consider only same flags */ | |
1241 | if (r1->flags != r2->flags) | |
1242 | return false; | |
1243 | ||
1244 | /* verify r1 is more restrictive */ | |
1245 | if ((r1->power_rule.max_antenna_gain > | |
1246 | r2->power_rule.max_antenna_gain) || | |
1247 | r1->power_rule.max_eirp > r2->power_rule.max_eirp) | |
1248 | return false; | |
1249 | ||
1250 | /* make sure r2's range is contained within r1 */ | |
1251 | if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz || | |
1252 | r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz) | |
1253 | return false; | |
1254 | ||
1255 | /* and finally verify that r1.max_bw >= r2.max_bw */ | |
1256 | if (r1->freq_range.max_bandwidth_khz < | |
1257 | r2->freq_range.max_bandwidth_khz) | |
1258 | return false; | |
1259 | ||
1260 | return true; | |
1261 | } | |
1262 | ||
1263 | /* add or extend current rules. do nothing if rule is already contained */ | |
1264 | static void add_rule(struct ieee80211_reg_rule *rule, | |
1265 | struct ieee80211_reg_rule *reg_rules, u32 *n_rules) | |
1266 | { | |
1267 | struct ieee80211_reg_rule *tmp_rule; | |
1268 | int i; | |
1269 | ||
1270 | for (i = 0; i < *n_rules; i++) { | |
1271 | tmp_rule = ®_rules[i]; | |
1272 | /* rule is already contained - do nothing */ | |
1273 | if (rule_contains(tmp_rule, rule)) | |
1274 | return; | |
1275 | ||
1276 | /* extend rule if possible */ | |
1277 | if (rule_contains(rule, tmp_rule)) { | |
1278 | memcpy(tmp_rule, rule, sizeof(*rule)); | |
1279 | return; | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | memcpy(®_rules[*n_rules], rule, sizeof(*rule)); | |
1284 | (*n_rules)++; | |
1285 | } | |
1286 | ||
1287 | /** | |
1288 | * regdom_intersect - do the intersection between two regulatory domains | |
1289 | * @rd1: first regulatory domain | |
1290 | * @rd2: second regulatory domain | |
1291 | * | |
1292 | * Use this function to get the intersection between two regulatory domains. | |
1293 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
1294 | * as no one single alpha2 can represent this regulatory domain. | |
1295 | * | |
1296 | * Returns a pointer to the regulatory domain structure which will hold the | |
1297 | * resulting intersection of rules between rd1 and rd2. We will | |
1298 | * kzalloc() this structure for you. | |
1299 | */ | |
1300 | static struct ieee80211_regdomain * | |
1301 | regdom_intersect(const struct ieee80211_regdomain *rd1, | |
1302 | const struct ieee80211_regdomain *rd2) | |
1303 | { | |
1304 | int r, size_of_regd; | |
1305 | unsigned int x, y; | |
1306 | unsigned int num_rules = 0; | |
1307 | const struct ieee80211_reg_rule *rule1, *rule2; | |
1308 | struct ieee80211_reg_rule intersected_rule; | |
1309 | struct ieee80211_regdomain *rd; | |
1310 | ||
1311 | if (!rd1 || !rd2) | |
1312 | return NULL; | |
1313 | ||
1314 | /* | |
1315 | * First we get a count of the rules we'll need, then we actually | |
1316 | * build them. This is to so we can malloc() and free() a | |
1317 | * regdomain once. The reason we use reg_rules_intersect() here | |
1318 | * is it will return -EINVAL if the rule computed makes no sense. | |
1319 | * All rules that do check out OK are valid. | |
1320 | */ | |
1321 | ||
1322 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
1323 | rule1 = &rd1->reg_rules[x]; | |
1324 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
1325 | rule2 = &rd2->reg_rules[y]; | |
1326 | if (!reg_rules_intersect(rd1, rd2, rule1, rule2, | |
1327 | &intersected_rule)) | |
1328 | num_rules++; | |
1329 | } | |
1330 | } | |
1331 | ||
1332 | if (!num_rules) | |
1333 | return NULL; | |
1334 | ||
1335 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1336 | num_rules * sizeof(struct ieee80211_reg_rule); | |
1337 | ||
1338 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
1339 | if (!rd) | |
1340 | return NULL; | |
1341 | ||
1342 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
1343 | rule1 = &rd1->reg_rules[x]; | |
1344 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
1345 | rule2 = &rd2->reg_rules[y]; | |
1346 | r = reg_rules_intersect(rd1, rd2, rule1, rule2, | |
1347 | &intersected_rule); | |
1348 | /* | |
1349 | * No need to memset here the intersected rule here as | |
1350 | * we're not using the stack anymore | |
1351 | */ | |
1352 | if (r) | |
1353 | continue; | |
1354 | ||
1355 | add_rule(&intersected_rule, rd->reg_rules, | |
1356 | &rd->n_reg_rules); | |
1357 | } | |
1358 | } | |
1359 | ||
1360 | rd->alpha2[0] = '9'; | |
1361 | rd->alpha2[1] = '8'; | |
1362 | rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region, | |
1363 | rd2->dfs_region); | |
1364 | ||
1365 | return rd; | |
1366 | } | |
1367 | ||
1368 | /* | |
1369 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
1370 | * want to just have the channel structure use these | |
1371 | */ | |
1372 | static u32 map_regdom_flags(u32 rd_flags) | |
1373 | { | |
1374 | u32 channel_flags = 0; | |
1375 | if (rd_flags & NL80211_RRF_NO_IR_ALL) | |
1376 | channel_flags |= IEEE80211_CHAN_NO_IR; | |
1377 | if (rd_flags & NL80211_RRF_DFS) | |
1378 | channel_flags |= IEEE80211_CHAN_RADAR; | |
1379 | if (rd_flags & NL80211_RRF_NO_OFDM) | |
1380 | channel_flags |= IEEE80211_CHAN_NO_OFDM; | |
1381 | if (rd_flags & NL80211_RRF_NO_OUTDOOR) | |
1382 | channel_flags |= IEEE80211_CHAN_INDOOR_ONLY; | |
1383 | if (rd_flags & NL80211_RRF_IR_CONCURRENT) | |
1384 | channel_flags |= IEEE80211_CHAN_IR_CONCURRENT; | |
1385 | if (rd_flags & NL80211_RRF_NO_HT40MINUS) | |
1386 | channel_flags |= IEEE80211_CHAN_NO_HT40MINUS; | |
1387 | if (rd_flags & NL80211_RRF_NO_HT40PLUS) | |
1388 | channel_flags |= IEEE80211_CHAN_NO_HT40PLUS; | |
1389 | if (rd_flags & NL80211_RRF_NO_80MHZ) | |
1390 | channel_flags |= IEEE80211_CHAN_NO_80MHZ; | |
1391 | if (rd_flags & NL80211_RRF_NO_160MHZ) | |
1392 | channel_flags |= IEEE80211_CHAN_NO_160MHZ; | |
1393 | return channel_flags; | |
1394 | } | |
1395 | ||
1396 | static const struct ieee80211_reg_rule * | |
1397 | freq_reg_info_regd(u32 center_freq, | |
1398 | const struct ieee80211_regdomain *regd, u32 bw) | |
1399 | { | |
1400 | int i; | |
1401 | bool band_rule_found = false; | |
1402 | bool bw_fits = false; | |
1403 | ||
1404 | if (!regd) | |
1405 | return ERR_PTR(-EINVAL); | |
1406 | ||
1407 | for (i = 0; i < regd->n_reg_rules; i++) { | |
1408 | const struct ieee80211_reg_rule *rr; | |
1409 | const struct ieee80211_freq_range *fr = NULL; | |
1410 | ||
1411 | rr = ®d->reg_rules[i]; | |
1412 | fr = &rr->freq_range; | |
1413 | ||
1414 | /* | |
1415 | * We only need to know if one frequency rule was | |
1416 | * was in center_freq's band, that's enough, so lets | |
1417 | * not overwrite it once found | |
1418 | */ | |
1419 | if (!band_rule_found) | |
1420 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
1421 | ||
1422 | bw_fits = cfg80211_does_bw_fit_range(fr, center_freq, bw); | |
1423 | ||
1424 | if (band_rule_found && bw_fits) | |
1425 | return rr; | |
1426 | } | |
1427 | ||
1428 | if (!band_rule_found) | |
1429 | return ERR_PTR(-ERANGE); | |
1430 | ||
1431 | return ERR_PTR(-EINVAL); | |
1432 | } | |
1433 | ||
1434 | static const struct ieee80211_reg_rule * | |
1435 | __freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw) | |
1436 | { | |
1437 | const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy); | |
1438 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1439 | u32 bw; | |
1440 | ||
1441 | for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) { | |
1442 | reg_rule = freq_reg_info_regd(center_freq, regd, bw); | |
1443 | if (!IS_ERR(reg_rule)) | |
1444 | return reg_rule; | |
1445 | } | |
1446 | ||
1447 | return reg_rule; | |
1448 | } | |
1449 | ||
1450 | const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy, | |
1451 | u32 center_freq) | |
1452 | { | |
1453 | return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(20)); | |
1454 | } | |
1455 | EXPORT_SYMBOL(freq_reg_info); | |
1456 | ||
1457 | const char *reg_initiator_name(enum nl80211_reg_initiator initiator) | |
1458 | { | |
1459 | switch (initiator) { | |
1460 | case NL80211_REGDOM_SET_BY_CORE: | |
1461 | return "core"; | |
1462 | case NL80211_REGDOM_SET_BY_USER: | |
1463 | return "user"; | |
1464 | case NL80211_REGDOM_SET_BY_DRIVER: | |
1465 | return "driver"; | |
1466 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
1467 | return "country IE"; | |
1468 | default: | |
1469 | WARN_ON(1); | |
1470 | return "bug"; | |
1471 | } | |
1472 | } | |
1473 | EXPORT_SYMBOL(reg_initiator_name); | |
1474 | ||
1475 | static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd, | |
1476 | const struct ieee80211_reg_rule *reg_rule, | |
1477 | const struct ieee80211_channel *chan) | |
1478 | { | |
1479 | const struct ieee80211_freq_range *freq_range = NULL; | |
1480 | u32 max_bandwidth_khz, bw_flags = 0; | |
1481 | ||
1482 | freq_range = ®_rule->freq_range; | |
1483 | ||
1484 | max_bandwidth_khz = freq_range->max_bandwidth_khz; | |
1485 | /* Check if auto calculation requested */ | |
1486 | if (reg_rule->flags & NL80211_RRF_AUTO_BW) | |
1487 | max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule); | |
1488 | ||
1489 | /* If we get a reg_rule we can assume that at least 5Mhz fit */ | |
1490 | if (!cfg80211_does_bw_fit_range(freq_range, | |
1491 | MHZ_TO_KHZ(chan->center_freq), | |
1492 | MHZ_TO_KHZ(10))) | |
1493 | bw_flags |= IEEE80211_CHAN_NO_10MHZ; | |
1494 | if (!cfg80211_does_bw_fit_range(freq_range, | |
1495 | MHZ_TO_KHZ(chan->center_freq), | |
1496 | MHZ_TO_KHZ(20))) | |
1497 | bw_flags |= IEEE80211_CHAN_NO_20MHZ; | |
1498 | ||
1499 | if (max_bandwidth_khz < MHZ_TO_KHZ(10)) | |
1500 | bw_flags |= IEEE80211_CHAN_NO_10MHZ; | |
1501 | if (max_bandwidth_khz < MHZ_TO_KHZ(20)) | |
1502 | bw_flags |= IEEE80211_CHAN_NO_20MHZ; | |
1503 | if (max_bandwidth_khz < MHZ_TO_KHZ(40)) | |
1504 | bw_flags |= IEEE80211_CHAN_NO_HT40; | |
1505 | if (max_bandwidth_khz < MHZ_TO_KHZ(80)) | |
1506 | bw_flags |= IEEE80211_CHAN_NO_80MHZ; | |
1507 | if (max_bandwidth_khz < MHZ_TO_KHZ(160)) | |
1508 | bw_flags |= IEEE80211_CHAN_NO_160MHZ; | |
1509 | return bw_flags; | |
1510 | } | |
1511 | ||
1512 | /* | |
1513 | * Note that right now we assume the desired channel bandwidth | |
1514 | * is always 20 MHz for each individual channel (HT40 uses 20 MHz | |
1515 | * per channel, the primary and the extension channel). | |
1516 | */ | |
1517 | static void handle_channel(struct wiphy *wiphy, | |
1518 | enum nl80211_reg_initiator initiator, | |
1519 | struct ieee80211_channel *chan) | |
1520 | { | |
1521 | u32 flags, bw_flags = 0; | |
1522 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1523 | const struct ieee80211_power_rule *power_rule = NULL; | |
1524 | struct wiphy *request_wiphy = NULL; | |
1525 | struct regulatory_request *lr = get_last_request(); | |
1526 | const struct ieee80211_regdomain *regd; | |
1527 | ||
1528 | request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx); | |
1529 | ||
1530 | flags = chan->orig_flags; | |
1531 | ||
1532 | reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq)); | |
1533 | if (IS_ERR(reg_rule)) { | |
1534 | /* | |
1535 | * We will disable all channels that do not match our | |
1536 | * received regulatory rule unless the hint is coming | |
1537 | * from a Country IE and the Country IE had no information | |
1538 | * about a band. The IEEE 802.11 spec allows for an AP | |
1539 | * to send only a subset of the regulatory rules allowed, | |
1540 | * so an AP in the US that only supports 2.4 GHz may only send | |
1541 | * a country IE with information for the 2.4 GHz band | |
1542 | * while 5 GHz is still supported. | |
1543 | */ | |
1544 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1545 | PTR_ERR(reg_rule) == -ERANGE) | |
1546 | return; | |
1547 | ||
1548 | if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER && | |
1549 | request_wiphy && request_wiphy == wiphy && | |
1550 | request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) { | |
1551 | pr_debug("Disabling freq %d MHz for good\n", | |
1552 | chan->center_freq); | |
1553 | chan->orig_flags |= IEEE80211_CHAN_DISABLED; | |
1554 | chan->flags = chan->orig_flags; | |
1555 | } else { | |
1556 | pr_debug("Disabling freq %d MHz\n", | |
1557 | chan->center_freq); | |
1558 | chan->flags |= IEEE80211_CHAN_DISABLED; | |
1559 | } | |
1560 | return; | |
1561 | } | |
1562 | ||
1563 | regd = reg_get_regdomain(wiphy); | |
1564 | ||
1565 | power_rule = ®_rule->power_rule; | |
1566 | bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan); | |
1567 | ||
1568 | if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER && | |
1569 | request_wiphy && request_wiphy == wiphy && | |
1570 | request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) { | |
1571 | /* | |
1572 | * This guarantees the driver's requested regulatory domain | |
1573 | * will always be used as a base for further regulatory | |
1574 | * settings | |
1575 | */ | |
1576 | chan->flags = chan->orig_flags = | |
1577 | map_regdom_flags(reg_rule->flags) | bw_flags; | |
1578 | chan->max_antenna_gain = chan->orig_mag = | |
1579 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
1580 | chan->max_reg_power = chan->max_power = chan->orig_mpwr = | |
1581 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
1582 | ||
1583 | if (chan->flags & IEEE80211_CHAN_RADAR) { | |
1584 | chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS; | |
1585 | if (reg_rule->dfs_cac_ms) | |
1586 | chan->dfs_cac_ms = reg_rule->dfs_cac_ms; | |
1587 | } | |
1588 | ||
1589 | return; | |
1590 | } | |
1591 | ||
1592 | chan->dfs_state = NL80211_DFS_USABLE; | |
1593 | chan->dfs_state_entered = jiffies; | |
1594 | ||
1595 | chan->beacon_found = false; | |
1596 | chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); | |
1597 | chan->max_antenna_gain = | |
1598 | min_t(int, chan->orig_mag, | |
1599 | MBI_TO_DBI(power_rule->max_antenna_gain)); | |
1600 | chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
1601 | ||
1602 | if (chan->flags & IEEE80211_CHAN_RADAR) { | |
1603 | if (reg_rule->dfs_cac_ms) | |
1604 | chan->dfs_cac_ms = reg_rule->dfs_cac_ms; | |
1605 | else | |
1606 | chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS; | |
1607 | } | |
1608 | ||
1609 | if (chan->orig_mpwr) { | |
1610 | /* | |
1611 | * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER | |
1612 | * will always follow the passed country IE power settings. | |
1613 | */ | |
1614 | if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1615 | wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER) | |
1616 | chan->max_power = chan->max_reg_power; | |
1617 | else | |
1618 | chan->max_power = min(chan->orig_mpwr, | |
1619 | chan->max_reg_power); | |
1620 | } else | |
1621 | chan->max_power = chan->max_reg_power; | |
1622 | } | |
1623 | ||
1624 | static void handle_band(struct wiphy *wiphy, | |
1625 | enum nl80211_reg_initiator initiator, | |
1626 | struct ieee80211_supported_band *sband) | |
1627 | { | |
1628 | unsigned int i; | |
1629 | ||
1630 | if (!sband) | |
1631 | return; | |
1632 | ||
1633 | for (i = 0; i < sband->n_channels; i++) | |
1634 | handle_channel(wiphy, initiator, &sband->channels[i]); | |
1635 | } | |
1636 | ||
1637 | static bool reg_request_cell_base(struct regulatory_request *request) | |
1638 | { | |
1639 | if (request->initiator != NL80211_REGDOM_SET_BY_USER) | |
1640 | return false; | |
1641 | return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE; | |
1642 | } | |
1643 | ||
1644 | bool reg_last_request_cell_base(void) | |
1645 | { | |
1646 | return reg_request_cell_base(get_last_request()); | |
1647 | } | |
1648 | ||
1649 | #ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS | |
1650 | /* Core specific check */ | |
1651 | static enum reg_request_treatment | |
1652 | reg_ignore_cell_hint(struct regulatory_request *pending_request) | |
1653 | { | |
1654 | struct regulatory_request *lr = get_last_request(); | |
1655 | ||
1656 | if (!reg_num_devs_support_basehint) | |
1657 | return REG_REQ_IGNORE; | |
1658 | ||
1659 | if (reg_request_cell_base(lr) && | |
1660 | !regdom_changes(pending_request->alpha2)) | |
1661 | return REG_REQ_ALREADY_SET; | |
1662 | ||
1663 | return REG_REQ_OK; | |
1664 | } | |
1665 | ||
1666 | /* Device specific check */ | |
1667 | static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy) | |
1668 | { | |
1669 | return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS); | |
1670 | } | |
1671 | #else | |
1672 | static enum reg_request_treatment | |
1673 | reg_ignore_cell_hint(struct regulatory_request *pending_request) | |
1674 | { | |
1675 | return REG_REQ_IGNORE; | |
1676 | } | |
1677 | ||
1678 | static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy) | |
1679 | { | |
1680 | return true; | |
1681 | } | |
1682 | #endif | |
1683 | ||
1684 | static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy) | |
1685 | { | |
1686 | if (wiphy->regulatory_flags & REGULATORY_STRICT_REG && | |
1687 | !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)) | |
1688 | return true; | |
1689 | return false; | |
1690 | } | |
1691 | ||
1692 | static bool ignore_reg_update(struct wiphy *wiphy, | |
1693 | enum nl80211_reg_initiator initiator) | |
1694 | { | |
1695 | struct regulatory_request *lr = get_last_request(); | |
1696 | ||
1697 | if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) | |
1698 | return true; | |
1699 | ||
1700 | if (!lr) { | |
1701 | pr_debug("Ignoring regulatory request set by %s since last_request is not set\n", | |
1702 | reg_initiator_name(initiator)); | |
1703 | return true; | |
1704 | } | |
1705 | ||
1706 | if (initiator == NL80211_REGDOM_SET_BY_CORE && | |
1707 | wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { | |
1708 | pr_debug("Ignoring regulatory request set by %s since the driver uses its own custom regulatory domain\n", | |
1709 | reg_initiator_name(initiator)); | |
1710 | return true; | |
1711 | } | |
1712 | ||
1713 | /* | |
1714 | * wiphy->regd will be set once the device has its own | |
1715 | * desired regulatory domain set | |
1716 | */ | |
1717 | if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd && | |
1718 | initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1719 | !is_world_regdom(lr->alpha2)) { | |
1720 | pr_debug("Ignoring regulatory request set by %s since the driver requires its own regulatory domain to be set first\n", | |
1721 | reg_initiator_name(initiator)); | |
1722 | return true; | |
1723 | } | |
1724 | ||
1725 | if (reg_request_cell_base(lr)) | |
1726 | return reg_dev_ignore_cell_hint(wiphy); | |
1727 | ||
1728 | return false; | |
1729 | } | |
1730 | ||
1731 | static bool reg_is_world_roaming(struct wiphy *wiphy) | |
1732 | { | |
1733 | const struct ieee80211_regdomain *cr = get_cfg80211_regdom(); | |
1734 | const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy); | |
1735 | struct regulatory_request *lr = get_last_request(); | |
1736 | ||
1737 | if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2))) | |
1738 | return true; | |
1739 | ||
1740 | if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
1741 | wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) | |
1742 | return true; | |
1743 | ||
1744 | return false; | |
1745 | } | |
1746 | ||
1747 | static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx, | |
1748 | struct reg_beacon *reg_beacon) | |
1749 | { | |
1750 | struct ieee80211_supported_band *sband; | |
1751 | struct ieee80211_channel *chan; | |
1752 | bool channel_changed = false; | |
1753 | struct ieee80211_channel chan_before; | |
1754 | ||
1755 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1756 | chan = &sband->channels[chan_idx]; | |
1757 | ||
1758 | if (likely(chan->center_freq != reg_beacon->chan.center_freq)) | |
1759 | return; | |
1760 | ||
1761 | if (chan->beacon_found) | |
1762 | return; | |
1763 | ||
1764 | chan->beacon_found = true; | |
1765 | ||
1766 | if (!reg_is_world_roaming(wiphy)) | |
1767 | return; | |
1768 | ||
1769 | if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS) | |
1770 | return; | |
1771 | ||
1772 | chan_before = *chan; | |
1773 | ||
1774 | if (chan->flags & IEEE80211_CHAN_NO_IR) { | |
1775 | chan->flags &= ~IEEE80211_CHAN_NO_IR; | |
1776 | channel_changed = true; | |
1777 | } | |
1778 | ||
1779 | if (channel_changed) | |
1780 | nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); | |
1781 | } | |
1782 | ||
1783 | /* | |
1784 | * Called when a scan on a wiphy finds a beacon on | |
1785 | * new channel | |
1786 | */ | |
1787 | static void wiphy_update_new_beacon(struct wiphy *wiphy, | |
1788 | struct reg_beacon *reg_beacon) | |
1789 | { | |
1790 | unsigned int i; | |
1791 | struct ieee80211_supported_band *sband; | |
1792 | ||
1793 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1794 | return; | |
1795 | ||
1796 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1797 | ||
1798 | for (i = 0; i < sband->n_channels; i++) | |
1799 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1800 | } | |
1801 | ||
1802 | /* | |
1803 | * Called upon reg changes or a new wiphy is added | |
1804 | */ | |
1805 | static void wiphy_update_beacon_reg(struct wiphy *wiphy) | |
1806 | { | |
1807 | unsigned int i; | |
1808 | struct ieee80211_supported_band *sband; | |
1809 | struct reg_beacon *reg_beacon; | |
1810 | ||
1811 | list_for_each_entry(reg_beacon, ®_beacon_list, list) { | |
1812 | if (!wiphy->bands[reg_beacon->chan.band]) | |
1813 | continue; | |
1814 | sband = wiphy->bands[reg_beacon->chan.band]; | |
1815 | for (i = 0; i < sband->n_channels; i++) | |
1816 | handle_reg_beacon(wiphy, i, reg_beacon); | |
1817 | } | |
1818 | } | |
1819 | ||
1820 | /* Reap the advantages of previously found beacons */ | |
1821 | static void reg_process_beacons(struct wiphy *wiphy) | |
1822 | { | |
1823 | /* | |
1824 | * Means we are just firing up cfg80211, so no beacons would | |
1825 | * have been processed yet. | |
1826 | */ | |
1827 | if (!last_request) | |
1828 | return; | |
1829 | wiphy_update_beacon_reg(wiphy); | |
1830 | } | |
1831 | ||
1832 | static bool is_ht40_allowed(struct ieee80211_channel *chan) | |
1833 | { | |
1834 | if (!chan) | |
1835 | return false; | |
1836 | if (chan->flags & IEEE80211_CHAN_DISABLED) | |
1837 | return false; | |
1838 | /* This would happen when regulatory rules disallow HT40 completely */ | |
1839 | if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40) | |
1840 | return false; | |
1841 | return true; | |
1842 | } | |
1843 | ||
1844 | static void reg_process_ht_flags_channel(struct wiphy *wiphy, | |
1845 | struct ieee80211_channel *channel) | |
1846 | { | |
1847 | struct ieee80211_supported_band *sband = wiphy->bands[channel->band]; | |
1848 | struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; | |
1849 | const struct ieee80211_regdomain *regd; | |
1850 | unsigned int i; | |
1851 | u32 flags; | |
1852 | ||
1853 | if (!is_ht40_allowed(channel)) { | |
1854 | channel->flags |= IEEE80211_CHAN_NO_HT40; | |
1855 | return; | |
1856 | } | |
1857 | ||
1858 | /* | |
1859 | * We need to ensure the extension channels exist to | |
1860 | * be able to use HT40- or HT40+, this finds them (or not) | |
1861 | */ | |
1862 | for (i = 0; i < sband->n_channels; i++) { | |
1863 | struct ieee80211_channel *c = &sband->channels[i]; | |
1864 | ||
1865 | if (c->center_freq == (channel->center_freq - 20)) | |
1866 | channel_before = c; | |
1867 | if (c->center_freq == (channel->center_freq + 20)) | |
1868 | channel_after = c; | |
1869 | } | |
1870 | ||
1871 | flags = 0; | |
1872 | regd = get_wiphy_regdom(wiphy); | |
1873 | if (regd) { | |
1874 | const struct ieee80211_reg_rule *reg_rule = | |
1875 | freq_reg_info_regd(MHZ_TO_KHZ(channel->center_freq), | |
1876 | regd, MHZ_TO_KHZ(20)); | |
1877 | ||
1878 | if (!IS_ERR(reg_rule)) | |
1879 | flags = reg_rule->flags; | |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * Please note that this assumes target bandwidth is 20 MHz, | |
1884 | * if that ever changes we also need to change the below logic | |
1885 | * to include that as well. | |
1886 | */ | |
1887 | if (!is_ht40_allowed(channel_before) || | |
1888 | flags & NL80211_RRF_NO_HT40MINUS) | |
1889 | channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; | |
1890 | else | |
1891 | channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; | |
1892 | ||
1893 | if (!is_ht40_allowed(channel_after) || | |
1894 | flags & NL80211_RRF_NO_HT40PLUS) | |
1895 | channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; | |
1896 | else | |
1897 | channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; | |
1898 | } | |
1899 | ||
1900 | static void reg_process_ht_flags_band(struct wiphy *wiphy, | |
1901 | struct ieee80211_supported_band *sband) | |
1902 | { | |
1903 | unsigned int i; | |
1904 | ||
1905 | if (!sband) | |
1906 | return; | |
1907 | ||
1908 | for (i = 0; i < sband->n_channels; i++) | |
1909 | reg_process_ht_flags_channel(wiphy, &sband->channels[i]); | |
1910 | } | |
1911 | ||
1912 | static void reg_process_ht_flags(struct wiphy *wiphy) | |
1913 | { | |
1914 | enum nl80211_band band; | |
1915 | ||
1916 | if (!wiphy) | |
1917 | return; | |
1918 | ||
1919 | for (band = 0; band < NUM_NL80211_BANDS; band++) | |
1920 | reg_process_ht_flags_band(wiphy, wiphy->bands[band]); | |
1921 | } | |
1922 | ||
1923 | static void reg_call_notifier(struct wiphy *wiphy, | |
1924 | struct regulatory_request *request) | |
1925 | { | |
1926 | if (wiphy->reg_notifier) | |
1927 | wiphy->reg_notifier(wiphy, request); | |
1928 | } | |
1929 | ||
1930 | static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev) | |
1931 | { | |
1932 | struct cfg80211_chan_def chandef = {}; | |
1933 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
1934 | enum nl80211_iftype iftype; | |
1935 | ||
1936 | wdev_lock(wdev); | |
1937 | iftype = wdev->iftype; | |
1938 | ||
1939 | /* make sure the interface is active */ | |
1940 | if (!wdev->netdev || !netif_running(wdev->netdev)) | |
1941 | goto wdev_inactive_unlock; | |
1942 | ||
1943 | switch (iftype) { | |
1944 | case NL80211_IFTYPE_AP: | |
1945 | case NL80211_IFTYPE_P2P_GO: | |
1946 | if (!wdev->beacon_interval) | |
1947 | goto wdev_inactive_unlock; | |
1948 | chandef = wdev->chandef; | |
1949 | break; | |
1950 | case NL80211_IFTYPE_ADHOC: | |
1951 | if (!wdev->ssid_len) | |
1952 | goto wdev_inactive_unlock; | |
1953 | chandef = wdev->chandef; | |
1954 | break; | |
1955 | case NL80211_IFTYPE_STATION: | |
1956 | case NL80211_IFTYPE_P2P_CLIENT: | |
1957 | if (!wdev->current_bss || | |
1958 | !wdev->current_bss->pub.channel) | |
1959 | goto wdev_inactive_unlock; | |
1960 | ||
1961 | if (!rdev->ops->get_channel || | |
1962 | rdev_get_channel(rdev, wdev, &chandef)) | |
1963 | cfg80211_chandef_create(&chandef, | |
1964 | wdev->current_bss->pub.channel, | |
1965 | NL80211_CHAN_NO_HT); | |
1966 | break; | |
1967 | case NL80211_IFTYPE_MONITOR: | |
1968 | case NL80211_IFTYPE_AP_VLAN: | |
1969 | case NL80211_IFTYPE_P2P_DEVICE: | |
1970 | /* no enforcement required */ | |
1971 | break; | |
1972 | default: | |
1973 | /* others not implemented for now */ | |
1974 | WARN_ON(1); | |
1975 | break; | |
1976 | } | |
1977 | ||
1978 | wdev_unlock(wdev); | |
1979 | ||
1980 | switch (iftype) { | |
1981 | case NL80211_IFTYPE_AP: | |
1982 | case NL80211_IFTYPE_P2P_GO: | |
1983 | case NL80211_IFTYPE_ADHOC: | |
1984 | return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype); | |
1985 | case NL80211_IFTYPE_STATION: | |
1986 | case NL80211_IFTYPE_P2P_CLIENT: | |
1987 | return cfg80211_chandef_usable(wiphy, &chandef, | |
1988 | IEEE80211_CHAN_DISABLED); | |
1989 | default: | |
1990 | break; | |
1991 | } | |
1992 | ||
1993 | return true; | |
1994 | ||
1995 | wdev_inactive_unlock: | |
1996 | wdev_unlock(wdev); | |
1997 | return true; | |
1998 | } | |
1999 | ||
2000 | static void reg_leave_invalid_chans(struct wiphy *wiphy) | |
2001 | { | |
2002 | struct wireless_dev *wdev; | |
2003 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
2004 | ||
2005 | ASSERT_RTNL(); | |
2006 | ||
2007 | list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) | |
2008 | if (!reg_wdev_chan_valid(wiphy, wdev)) | |
2009 | cfg80211_leave(rdev, wdev); | |
2010 | } | |
2011 | ||
2012 | static void reg_check_chans_work(struct work_struct *work) | |
2013 | { | |
2014 | struct cfg80211_registered_device *rdev; | |
2015 | ||
2016 | pr_debug("Verifying active interfaces after reg change\n"); | |
2017 | rtnl_lock(); | |
2018 | ||
2019 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) | |
2020 | if (!(rdev->wiphy.regulatory_flags & | |
2021 | REGULATORY_IGNORE_STALE_KICKOFF)) | |
2022 | reg_leave_invalid_chans(&rdev->wiphy); | |
2023 | ||
2024 | rtnl_unlock(); | |
2025 | } | |
2026 | ||
2027 | static void reg_check_channels(void) | |
2028 | { | |
2029 | /* | |
2030 | * Give usermode a chance to do something nicer (move to another | |
2031 | * channel, orderly disconnection), before forcing a disconnection. | |
2032 | */ | |
2033 | mod_delayed_work(system_power_efficient_wq, | |
2034 | ®_check_chans, | |
2035 | msecs_to_jiffies(REG_ENFORCE_GRACE_MS)); | |
2036 | } | |
2037 | ||
2038 | static void wiphy_update_regulatory(struct wiphy *wiphy, | |
2039 | enum nl80211_reg_initiator initiator) | |
2040 | { | |
2041 | enum nl80211_band band; | |
2042 | struct regulatory_request *lr = get_last_request(); | |
2043 | ||
2044 | if (ignore_reg_update(wiphy, initiator)) { | |
2045 | /* | |
2046 | * Regulatory updates set by CORE are ignored for custom | |
2047 | * regulatory cards. Let us notify the changes to the driver, | |
2048 | * as some drivers used this to restore its orig_* reg domain. | |
2049 | */ | |
2050 | if (initiator == NL80211_REGDOM_SET_BY_CORE && | |
2051 | wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) | |
2052 | reg_call_notifier(wiphy, lr); | |
2053 | return; | |
2054 | } | |
2055 | ||
2056 | lr->dfs_region = get_cfg80211_regdom()->dfs_region; | |
2057 | ||
2058 | for (band = 0; band < NUM_NL80211_BANDS; band++) | |
2059 | handle_band(wiphy, initiator, wiphy->bands[band]); | |
2060 | ||
2061 | reg_process_beacons(wiphy); | |
2062 | reg_process_ht_flags(wiphy); | |
2063 | reg_call_notifier(wiphy, lr); | |
2064 | } | |
2065 | ||
2066 | static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) | |
2067 | { | |
2068 | struct cfg80211_registered_device *rdev; | |
2069 | struct wiphy *wiphy; | |
2070 | ||
2071 | ASSERT_RTNL(); | |
2072 | ||
2073 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
2074 | wiphy = &rdev->wiphy; | |
2075 | wiphy_update_regulatory(wiphy, initiator); | |
2076 | } | |
2077 | ||
2078 | reg_check_channels(); | |
2079 | } | |
2080 | ||
2081 | static void handle_channel_custom(struct wiphy *wiphy, | |
2082 | struct ieee80211_channel *chan, | |
2083 | const struct ieee80211_regdomain *regd, | |
2084 | u32 min_bw) | |
2085 | { | |
2086 | u32 bw_flags = 0; | |
2087 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
2088 | const struct ieee80211_power_rule *power_rule = NULL; | |
2089 | u32 bw; | |
2090 | ||
2091 | for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) { | |
2092 | reg_rule = freq_reg_info_regd(MHZ_TO_KHZ(chan->center_freq), | |
2093 | regd, bw); | |
2094 | if (!IS_ERR(reg_rule)) | |
2095 | break; | |
2096 | } | |
2097 | ||
2098 | if (IS_ERR(reg_rule)) { | |
2099 | pr_debug("Disabling freq %d MHz as custom regd has no rule that fits it\n", | |
2100 | chan->center_freq); | |
2101 | if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) { | |
2102 | chan->flags |= IEEE80211_CHAN_DISABLED; | |
2103 | } else { | |
2104 | chan->orig_flags |= IEEE80211_CHAN_DISABLED; | |
2105 | chan->flags = chan->orig_flags; | |
2106 | } | |
2107 | return; | |
2108 | } | |
2109 | ||
2110 | power_rule = ®_rule->power_rule; | |
2111 | bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan); | |
2112 | ||
2113 | chan->dfs_state_entered = jiffies; | |
2114 | chan->dfs_state = NL80211_DFS_USABLE; | |
2115 | ||
2116 | chan->beacon_found = false; | |
2117 | ||
2118 | if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) | |
2119 | chan->flags = chan->orig_flags | bw_flags | | |
2120 | map_regdom_flags(reg_rule->flags); | |
2121 | else | |
2122 | chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; | |
2123 | ||
2124 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
2125 | chan->max_reg_power = chan->max_power = | |
2126 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
2127 | ||
2128 | if (chan->flags & IEEE80211_CHAN_RADAR) { | |
2129 | if (reg_rule->dfs_cac_ms) | |
2130 | chan->dfs_cac_ms = reg_rule->dfs_cac_ms; | |
2131 | else | |
2132 | chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS; | |
2133 | } | |
2134 | ||
2135 | chan->max_power = chan->max_reg_power; | |
2136 | } | |
2137 | ||
2138 | static void handle_band_custom(struct wiphy *wiphy, | |
2139 | struct ieee80211_supported_band *sband, | |
2140 | const struct ieee80211_regdomain *regd) | |
2141 | { | |
2142 | unsigned int i; | |
2143 | ||
2144 | if (!sband) | |
2145 | return; | |
2146 | ||
2147 | /* | |
2148 | * We currently assume that you always want at least 20 MHz, | |
2149 | * otherwise channel 12 might get enabled if this rule is | |
2150 | * compatible to US, which permits 2402 - 2472 MHz. | |
2151 | */ | |
2152 | for (i = 0; i < sband->n_channels; i++) | |
2153 | handle_channel_custom(wiphy, &sband->channels[i], regd, | |
2154 | MHZ_TO_KHZ(20)); | |
2155 | } | |
2156 | ||
2157 | /* Used by drivers prior to wiphy registration */ | |
2158 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
2159 | const struct ieee80211_regdomain *regd) | |
2160 | { | |
2161 | enum nl80211_band band; | |
2162 | unsigned int bands_set = 0; | |
2163 | ||
2164 | WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG), | |
2165 | "wiphy should have REGULATORY_CUSTOM_REG\n"); | |
2166 | wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG; | |
2167 | ||
2168 | for (band = 0; band < NUM_NL80211_BANDS; band++) { | |
2169 | if (!wiphy->bands[band]) | |
2170 | continue; | |
2171 | handle_band_custom(wiphy, wiphy->bands[band], regd); | |
2172 | bands_set++; | |
2173 | } | |
2174 | ||
2175 | /* | |
2176 | * no point in calling this if it won't have any effect | |
2177 | * on your device's supported bands. | |
2178 | */ | |
2179 | WARN_ON(!bands_set); | |
2180 | } | |
2181 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); | |
2182 | ||
2183 | static void reg_set_request_processed(void) | |
2184 | { | |
2185 | bool need_more_processing = false; | |
2186 | struct regulatory_request *lr = get_last_request(); | |
2187 | ||
2188 | lr->processed = true; | |
2189 | ||
2190 | spin_lock(®_requests_lock); | |
2191 | if (!list_empty(®_requests_list)) | |
2192 | need_more_processing = true; | |
2193 | spin_unlock(®_requests_lock); | |
2194 | ||
2195 | cancel_crda_timeout(); | |
2196 | ||
2197 | if (need_more_processing) | |
2198 | schedule_work(®_work); | |
2199 | } | |
2200 | ||
2201 | /** | |
2202 | * reg_process_hint_core - process core regulatory requests | |
2203 | * @pending_request: a pending core regulatory request | |
2204 | * | |
2205 | * The wireless subsystem can use this function to process | |
2206 | * a regulatory request issued by the regulatory core. | |
2207 | */ | |
2208 | static enum reg_request_treatment | |
2209 | reg_process_hint_core(struct regulatory_request *core_request) | |
2210 | { | |
2211 | if (reg_query_database(core_request)) { | |
2212 | core_request->intersect = false; | |
2213 | core_request->processed = false; | |
2214 | reg_update_last_request(core_request); | |
2215 | return REG_REQ_OK; | |
2216 | } | |
2217 | ||
2218 | return REG_REQ_IGNORE; | |
2219 | } | |
2220 | ||
2221 | static enum reg_request_treatment | |
2222 | __reg_process_hint_user(struct regulatory_request *user_request) | |
2223 | { | |
2224 | struct regulatory_request *lr = get_last_request(); | |
2225 | ||
2226 | if (reg_request_cell_base(user_request)) | |
2227 | return reg_ignore_cell_hint(user_request); | |
2228 | ||
2229 | if (reg_request_cell_base(lr)) | |
2230 | return REG_REQ_IGNORE; | |
2231 | ||
2232 | if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
2233 | return REG_REQ_INTERSECT; | |
2234 | /* | |
2235 | * If the user knows better the user should set the regdom | |
2236 | * to their country before the IE is picked up | |
2237 | */ | |
2238 | if (lr->initiator == NL80211_REGDOM_SET_BY_USER && | |
2239 | lr->intersect) | |
2240 | return REG_REQ_IGNORE; | |
2241 | /* | |
2242 | * Process user requests only after previous user/driver/core | |
2243 | * requests have been processed | |
2244 | */ | |
2245 | if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE || | |
2246 | lr->initiator == NL80211_REGDOM_SET_BY_DRIVER || | |
2247 | lr->initiator == NL80211_REGDOM_SET_BY_USER) && | |
2248 | regdom_changes(lr->alpha2)) | |
2249 | return REG_REQ_IGNORE; | |
2250 | ||
2251 | if (!regdom_changes(user_request->alpha2)) | |
2252 | return REG_REQ_ALREADY_SET; | |
2253 | ||
2254 | return REG_REQ_OK; | |
2255 | } | |
2256 | ||
2257 | /** | |
2258 | * reg_process_hint_user - process user regulatory requests | |
2259 | * @user_request: a pending user regulatory request | |
2260 | * | |
2261 | * The wireless subsystem can use this function to process | |
2262 | * a regulatory request initiated by userspace. | |
2263 | */ | |
2264 | static enum reg_request_treatment | |
2265 | reg_process_hint_user(struct regulatory_request *user_request) | |
2266 | { | |
2267 | enum reg_request_treatment treatment; | |
2268 | ||
2269 | treatment = __reg_process_hint_user(user_request); | |
2270 | if (treatment == REG_REQ_IGNORE || | |
2271 | treatment == REG_REQ_ALREADY_SET) | |
2272 | return REG_REQ_IGNORE; | |
2273 | ||
2274 | user_request->intersect = treatment == REG_REQ_INTERSECT; | |
2275 | user_request->processed = false; | |
2276 | ||
2277 | if (reg_query_database(user_request)) { | |
2278 | reg_update_last_request(user_request); | |
2279 | user_alpha2[0] = user_request->alpha2[0]; | |
2280 | user_alpha2[1] = user_request->alpha2[1]; | |
2281 | return REG_REQ_OK; | |
2282 | } | |
2283 | ||
2284 | return REG_REQ_IGNORE; | |
2285 | } | |
2286 | ||
2287 | static enum reg_request_treatment | |
2288 | __reg_process_hint_driver(struct regulatory_request *driver_request) | |
2289 | { | |
2290 | struct regulatory_request *lr = get_last_request(); | |
2291 | ||
2292 | if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) { | |
2293 | if (regdom_changes(driver_request->alpha2)) | |
2294 | return REG_REQ_OK; | |
2295 | return REG_REQ_ALREADY_SET; | |
2296 | } | |
2297 | ||
2298 | /* | |
2299 | * This would happen if you unplug and plug your card | |
2300 | * back in or if you add a new device for which the previously | |
2301 | * loaded card also agrees on the regulatory domain. | |
2302 | */ | |
2303 | if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER && | |
2304 | !regdom_changes(driver_request->alpha2)) | |
2305 | return REG_REQ_ALREADY_SET; | |
2306 | ||
2307 | return REG_REQ_INTERSECT; | |
2308 | } | |
2309 | ||
2310 | /** | |
2311 | * reg_process_hint_driver - process driver regulatory requests | |
2312 | * @driver_request: a pending driver regulatory request | |
2313 | * | |
2314 | * The wireless subsystem can use this function to process | |
2315 | * a regulatory request issued by an 802.11 driver. | |
2316 | * | |
2317 | * Returns one of the different reg request treatment values. | |
2318 | */ | |
2319 | static enum reg_request_treatment | |
2320 | reg_process_hint_driver(struct wiphy *wiphy, | |
2321 | struct regulatory_request *driver_request) | |
2322 | { | |
2323 | const struct ieee80211_regdomain *regd, *tmp; | |
2324 | enum reg_request_treatment treatment; | |
2325 | ||
2326 | treatment = __reg_process_hint_driver(driver_request); | |
2327 | ||
2328 | switch (treatment) { | |
2329 | case REG_REQ_OK: | |
2330 | break; | |
2331 | case REG_REQ_IGNORE: | |
2332 | return REG_REQ_IGNORE; | |
2333 | case REG_REQ_INTERSECT: | |
2334 | case REG_REQ_ALREADY_SET: | |
2335 | regd = reg_copy_regd(get_cfg80211_regdom()); | |
2336 | if (IS_ERR(regd)) | |
2337 | return REG_REQ_IGNORE; | |
2338 | ||
2339 | tmp = get_wiphy_regdom(wiphy); | |
2340 | rcu_assign_pointer(wiphy->regd, regd); | |
2341 | rcu_free_regdom(tmp); | |
2342 | } | |
2343 | ||
2344 | ||
2345 | driver_request->intersect = treatment == REG_REQ_INTERSECT; | |
2346 | driver_request->processed = false; | |
2347 | ||
2348 | /* | |
2349 | * Since CRDA will not be called in this case as we already | |
2350 | * have applied the requested regulatory domain before we just | |
2351 | * inform userspace we have processed the request | |
2352 | */ | |
2353 | if (treatment == REG_REQ_ALREADY_SET) { | |
2354 | nl80211_send_reg_change_event(driver_request); | |
2355 | reg_update_last_request(driver_request); | |
2356 | reg_set_request_processed(); | |
2357 | return REG_REQ_ALREADY_SET; | |
2358 | } | |
2359 | ||
2360 | if (reg_query_database(driver_request)) { | |
2361 | reg_update_last_request(driver_request); | |
2362 | return REG_REQ_OK; | |
2363 | } | |
2364 | ||
2365 | return REG_REQ_IGNORE; | |
2366 | } | |
2367 | ||
2368 | static enum reg_request_treatment | |
2369 | __reg_process_hint_country_ie(struct wiphy *wiphy, | |
2370 | struct regulatory_request *country_ie_request) | |
2371 | { | |
2372 | struct wiphy *last_wiphy = NULL; | |
2373 | struct regulatory_request *lr = get_last_request(); | |
2374 | ||
2375 | if (reg_request_cell_base(lr)) { | |
2376 | /* Trust a Cell base station over the AP's country IE */ | |
2377 | if (regdom_changes(country_ie_request->alpha2)) | |
2378 | return REG_REQ_IGNORE; | |
2379 | return REG_REQ_ALREADY_SET; | |
2380 | } else { | |
2381 | if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE) | |
2382 | return REG_REQ_IGNORE; | |
2383 | } | |
2384 | ||
2385 | if (unlikely(!is_an_alpha2(country_ie_request->alpha2))) | |
2386 | return -EINVAL; | |
2387 | ||
2388 | if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) | |
2389 | return REG_REQ_OK; | |
2390 | ||
2391 | last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx); | |
2392 | ||
2393 | if (last_wiphy != wiphy) { | |
2394 | /* | |
2395 | * Two cards with two APs claiming different | |
2396 | * Country IE alpha2s. We could | |
2397 | * intersect them, but that seems unlikely | |
2398 | * to be correct. Reject second one for now. | |
2399 | */ | |
2400 | if (regdom_changes(country_ie_request->alpha2)) | |
2401 | return REG_REQ_IGNORE; | |
2402 | return REG_REQ_ALREADY_SET; | |
2403 | } | |
2404 | ||
2405 | if (regdom_changes(country_ie_request->alpha2)) | |
2406 | return REG_REQ_OK; | |
2407 | return REG_REQ_ALREADY_SET; | |
2408 | } | |
2409 | ||
2410 | /** | |
2411 | * reg_process_hint_country_ie - process regulatory requests from country IEs | |
2412 | * @country_ie_request: a regulatory request from a country IE | |
2413 | * | |
2414 | * The wireless subsystem can use this function to process | |
2415 | * a regulatory request issued by a country Information Element. | |
2416 | * | |
2417 | * Returns one of the different reg request treatment values. | |
2418 | */ | |
2419 | static enum reg_request_treatment | |
2420 | reg_process_hint_country_ie(struct wiphy *wiphy, | |
2421 | struct regulatory_request *country_ie_request) | |
2422 | { | |
2423 | enum reg_request_treatment treatment; | |
2424 | ||
2425 | treatment = __reg_process_hint_country_ie(wiphy, country_ie_request); | |
2426 | ||
2427 | switch (treatment) { | |
2428 | case REG_REQ_OK: | |
2429 | break; | |
2430 | case REG_REQ_IGNORE: | |
2431 | return REG_REQ_IGNORE; | |
2432 | case REG_REQ_ALREADY_SET: | |
2433 | reg_free_request(country_ie_request); | |
2434 | return REG_REQ_ALREADY_SET; | |
2435 | case REG_REQ_INTERSECT: | |
2436 | /* | |
2437 | * This doesn't happen yet, not sure we | |
2438 | * ever want to support it for this case. | |
2439 | */ | |
2440 | WARN_ONCE(1, "Unexpected intersection for country IEs"); | |
2441 | return REG_REQ_IGNORE; | |
2442 | } | |
2443 | ||
2444 | country_ie_request->intersect = false; | |
2445 | country_ie_request->processed = false; | |
2446 | ||
2447 | if (reg_query_database(country_ie_request)) { | |
2448 | reg_update_last_request(country_ie_request); | |
2449 | return REG_REQ_OK; | |
2450 | } | |
2451 | ||
2452 | return REG_REQ_IGNORE; | |
2453 | } | |
2454 | ||
2455 | bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2) | |
2456 | { | |
2457 | const struct ieee80211_regdomain *wiphy1_regd = NULL; | |
2458 | const struct ieee80211_regdomain *wiphy2_regd = NULL; | |
2459 | const struct ieee80211_regdomain *cfg80211_regd = NULL; | |
2460 | bool dfs_domain_same; | |
2461 | ||
2462 | rcu_read_lock(); | |
2463 | ||
2464 | cfg80211_regd = rcu_dereference(cfg80211_regdomain); | |
2465 | wiphy1_regd = rcu_dereference(wiphy1->regd); | |
2466 | if (!wiphy1_regd) | |
2467 | wiphy1_regd = cfg80211_regd; | |
2468 | ||
2469 | wiphy2_regd = rcu_dereference(wiphy2->regd); | |
2470 | if (!wiphy2_regd) | |
2471 | wiphy2_regd = cfg80211_regd; | |
2472 | ||
2473 | dfs_domain_same = wiphy1_regd->dfs_region == wiphy2_regd->dfs_region; | |
2474 | ||
2475 | rcu_read_unlock(); | |
2476 | ||
2477 | return dfs_domain_same; | |
2478 | } | |
2479 | ||
2480 | static void reg_copy_dfs_chan_state(struct ieee80211_channel *dst_chan, | |
2481 | struct ieee80211_channel *src_chan) | |
2482 | { | |
2483 | if (!(dst_chan->flags & IEEE80211_CHAN_RADAR) || | |
2484 | !(src_chan->flags & IEEE80211_CHAN_RADAR)) | |
2485 | return; | |
2486 | ||
2487 | if (dst_chan->flags & IEEE80211_CHAN_DISABLED || | |
2488 | src_chan->flags & IEEE80211_CHAN_DISABLED) | |
2489 | return; | |
2490 | ||
2491 | if (src_chan->center_freq == dst_chan->center_freq && | |
2492 | dst_chan->dfs_state == NL80211_DFS_USABLE) { | |
2493 | dst_chan->dfs_state = src_chan->dfs_state; | |
2494 | dst_chan->dfs_state_entered = src_chan->dfs_state_entered; | |
2495 | } | |
2496 | } | |
2497 | ||
2498 | static void wiphy_share_dfs_chan_state(struct wiphy *dst_wiphy, | |
2499 | struct wiphy *src_wiphy) | |
2500 | { | |
2501 | struct ieee80211_supported_band *src_sband, *dst_sband; | |
2502 | struct ieee80211_channel *src_chan, *dst_chan; | |
2503 | int i, j, band; | |
2504 | ||
2505 | if (!reg_dfs_domain_same(dst_wiphy, src_wiphy)) | |
2506 | return; | |
2507 | ||
2508 | for (band = 0; band < NUM_NL80211_BANDS; band++) { | |
2509 | dst_sband = dst_wiphy->bands[band]; | |
2510 | src_sband = src_wiphy->bands[band]; | |
2511 | if (!dst_sband || !src_sband) | |
2512 | continue; | |
2513 | ||
2514 | for (i = 0; i < dst_sband->n_channels; i++) { | |
2515 | dst_chan = &dst_sband->channels[i]; | |
2516 | for (j = 0; j < src_sband->n_channels; j++) { | |
2517 | src_chan = &src_sband->channels[j]; | |
2518 | reg_copy_dfs_chan_state(dst_chan, src_chan); | |
2519 | } | |
2520 | } | |
2521 | } | |
2522 | } | |
2523 | ||
2524 | static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy) | |
2525 | { | |
2526 | struct cfg80211_registered_device *rdev; | |
2527 | ||
2528 | ASSERT_RTNL(); | |
2529 | ||
2530 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
2531 | if (wiphy == &rdev->wiphy) | |
2532 | continue; | |
2533 | wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy); | |
2534 | } | |
2535 | } | |
2536 | ||
2537 | /* This processes *all* regulatory hints */ | |
2538 | static void reg_process_hint(struct regulatory_request *reg_request) | |
2539 | { | |
2540 | struct wiphy *wiphy = NULL; | |
2541 | enum reg_request_treatment treatment; | |
2542 | enum nl80211_reg_initiator initiator = reg_request->initiator; | |
2543 | ||
2544 | if (reg_request->wiphy_idx != WIPHY_IDX_INVALID) | |
2545 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
2546 | ||
2547 | switch (initiator) { | |
2548 | case NL80211_REGDOM_SET_BY_CORE: | |
2549 | treatment = reg_process_hint_core(reg_request); | |
2550 | break; | |
2551 | case NL80211_REGDOM_SET_BY_USER: | |
2552 | treatment = reg_process_hint_user(reg_request); | |
2553 | break; | |
2554 | case NL80211_REGDOM_SET_BY_DRIVER: | |
2555 | if (!wiphy) | |
2556 | goto out_free; | |
2557 | treatment = reg_process_hint_driver(wiphy, reg_request); | |
2558 | break; | |
2559 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
2560 | if (!wiphy) | |
2561 | goto out_free; | |
2562 | treatment = reg_process_hint_country_ie(wiphy, reg_request); | |
2563 | break; | |
2564 | default: | |
2565 | WARN(1, "invalid initiator %d\n", initiator); | |
2566 | goto out_free; | |
2567 | } | |
2568 | ||
2569 | if (treatment == REG_REQ_IGNORE) | |
2570 | goto out_free; | |
2571 | ||
2572 | WARN(treatment != REG_REQ_OK && treatment != REG_REQ_ALREADY_SET, | |
2573 | "unexpected treatment value %d\n", treatment); | |
2574 | ||
2575 | /* This is required so that the orig_* parameters are saved. | |
2576 | * NOTE: treatment must be set for any case that reaches here! | |
2577 | */ | |
2578 | if (treatment == REG_REQ_ALREADY_SET && wiphy && | |
2579 | wiphy->regulatory_flags & REGULATORY_STRICT_REG) { | |
2580 | wiphy_update_regulatory(wiphy, initiator); | |
2581 | wiphy_all_share_dfs_chan_state(wiphy); | |
2582 | reg_check_channels(); | |
2583 | } | |
2584 | ||
2585 | return; | |
2586 | ||
2587 | out_free: | |
2588 | reg_free_request(reg_request); | |
2589 | } | |
2590 | ||
2591 | static bool reg_only_self_managed_wiphys(void) | |
2592 | { | |
2593 | struct cfg80211_registered_device *rdev; | |
2594 | struct wiphy *wiphy; | |
2595 | bool self_managed_found = false; | |
2596 | ||
2597 | ASSERT_RTNL(); | |
2598 | ||
2599 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
2600 | wiphy = &rdev->wiphy; | |
2601 | if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) | |
2602 | self_managed_found = true; | |
2603 | else | |
2604 | return false; | |
2605 | } | |
2606 | ||
2607 | /* make sure at least one self-managed wiphy exists */ | |
2608 | return self_managed_found; | |
2609 | } | |
2610 | ||
2611 | /* | |
2612 | * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* | |
2613 | * Regulatory hints come on a first come first serve basis and we | |
2614 | * must process each one atomically. | |
2615 | */ | |
2616 | static void reg_process_pending_hints(void) | |
2617 | { | |
2618 | struct regulatory_request *reg_request, *lr; | |
2619 | ||
2620 | lr = get_last_request(); | |
2621 | ||
2622 | /* When last_request->processed becomes true this will be rescheduled */ | |
2623 | if (lr && !lr->processed) { | |
2624 | pr_debug("Pending regulatory request, waiting for it to be processed...\n"); | |
2625 | return; | |
2626 | } | |
2627 | ||
2628 | spin_lock(®_requests_lock); | |
2629 | ||
2630 | if (list_empty(®_requests_list)) { | |
2631 | spin_unlock(®_requests_lock); | |
2632 | return; | |
2633 | } | |
2634 | ||
2635 | reg_request = list_first_entry(®_requests_list, | |
2636 | struct regulatory_request, | |
2637 | list); | |
2638 | list_del_init(®_request->list); | |
2639 | ||
2640 | spin_unlock(®_requests_lock); | |
2641 | ||
2642 | if (reg_only_self_managed_wiphys()) { | |
2643 | reg_free_request(reg_request); | |
2644 | return; | |
2645 | } | |
2646 | ||
2647 | reg_process_hint(reg_request); | |
2648 | ||
2649 | lr = get_last_request(); | |
2650 | ||
2651 | spin_lock(®_requests_lock); | |
2652 | if (!list_empty(®_requests_list) && lr && lr->processed) | |
2653 | schedule_work(®_work); | |
2654 | spin_unlock(®_requests_lock); | |
2655 | } | |
2656 | ||
2657 | /* Processes beacon hints -- this has nothing to do with country IEs */ | |
2658 | static void reg_process_pending_beacon_hints(void) | |
2659 | { | |
2660 | struct cfg80211_registered_device *rdev; | |
2661 | struct reg_beacon *pending_beacon, *tmp; | |
2662 | ||
2663 | /* This goes through the _pending_ beacon list */ | |
2664 | spin_lock_bh(®_pending_beacons_lock); | |
2665 | ||
2666 | list_for_each_entry_safe(pending_beacon, tmp, | |
2667 | ®_pending_beacons, list) { | |
2668 | list_del_init(&pending_beacon->list); | |
2669 | ||
2670 | /* Applies the beacon hint to current wiphys */ | |
2671 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) | |
2672 | wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); | |
2673 | ||
2674 | /* Remembers the beacon hint for new wiphys or reg changes */ | |
2675 | list_add_tail(&pending_beacon->list, ®_beacon_list); | |
2676 | } | |
2677 | ||
2678 | spin_unlock_bh(®_pending_beacons_lock); | |
2679 | } | |
2680 | ||
2681 | static void reg_process_self_managed_hints(void) | |
2682 | { | |
2683 | struct cfg80211_registered_device *rdev; | |
2684 | struct wiphy *wiphy; | |
2685 | const struct ieee80211_regdomain *tmp; | |
2686 | const struct ieee80211_regdomain *regd; | |
2687 | enum nl80211_band band; | |
2688 | struct regulatory_request request = {}; | |
2689 | ||
2690 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
2691 | wiphy = &rdev->wiphy; | |
2692 | ||
2693 | spin_lock(®_requests_lock); | |
2694 | regd = rdev->requested_regd; | |
2695 | rdev->requested_regd = NULL; | |
2696 | spin_unlock(®_requests_lock); | |
2697 | ||
2698 | if (regd == NULL) | |
2699 | continue; | |
2700 | ||
2701 | tmp = get_wiphy_regdom(wiphy); | |
2702 | rcu_assign_pointer(wiphy->regd, regd); | |
2703 | rcu_free_regdom(tmp); | |
2704 | ||
2705 | for (band = 0; band < NUM_NL80211_BANDS; band++) | |
2706 | handle_band_custom(wiphy, wiphy->bands[band], regd); | |
2707 | ||
2708 | reg_process_ht_flags(wiphy); | |
2709 | ||
2710 | request.wiphy_idx = get_wiphy_idx(wiphy); | |
2711 | request.alpha2[0] = regd->alpha2[0]; | |
2712 | request.alpha2[1] = regd->alpha2[1]; | |
2713 | request.initiator = NL80211_REGDOM_SET_BY_DRIVER; | |
2714 | ||
2715 | nl80211_send_wiphy_reg_change_event(&request); | |
2716 | } | |
2717 | ||
2718 | reg_check_channels(); | |
2719 | } | |
2720 | ||
2721 | static void reg_todo(struct work_struct *work) | |
2722 | { | |
2723 | rtnl_lock(); | |
2724 | reg_process_pending_hints(); | |
2725 | reg_process_pending_beacon_hints(); | |
2726 | reg_process_self_managed_hints(); | |
2727 | rtnl_unlock(); | |
2728 | } | |
2729 | ||
2730 | static void queue_regulatory_request(struct regulatory_request *request) | |
2731 | { | |
2732 | request->alpha2[0] = toupper(request->alpha2[0]); | |
2733 | request->alpha2[1] = toupper(request->alpha2[1]); | |
2734 | ||
2735 | spin_lock(®_requests_lock); | |
2736 | list_add_tail(&request->list, ®_requests_list); | |
2737 | spin_unlock(®_requests_lock); | |
2738 | ||
2739 | schedule_work(®_work); | |
2740 | } | |
2741 | ||
2742 | /* | |
2743 | * Core regulatory hint -- happens during cfg80211_init() | |
2744 | * and when we restore regulatory settings. | |
2745 | */ | |
2746 | static int regulatory_hint_core(const char *alpha2) | |
2747 | { | |
2748 | struct regulatory_request *request; | |
2749 | ||
2750 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
2751 | if (!request) | |
2752 | return -ENOMEM; | |
2753 | ||
2754 | request->alpha2[0] = alpha2[0]; | |
2755 | request->alpha2[1] = alpha2[1]; | |
2756 | request->initiator = NL80211_REGDOM_SET_BY_CORE; | |
2757 | request->wiphy_idx = WIPHY_IDX_INVALID; | |
2758 | ||
2759 | queue_regulatory_request(request); | |
2760 | ||
2761 | return 0; | |
2762 | } | |
2763 | ||
2764 | /* User hints */ | |
2765 | int regulatory_hint_user(const char *alpha2, | |
2766 | enum nl80211_user_reg_hint_type user_reg_hint_type) | |
2767 | { | |
2768 | struct regulatory_request *request; | |
2769 | ||
2770 | if (WARN_ON(!alpha2)) | |
2771 | return -EINVAL; | |
2772 | ||
2773 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
2774 | if (!request) | |
2775 | return -ENOMEM; | |
2776 | ||
2777 | request->wiphy_idx = WIPHY_IDX_INVALID; | |
2778 | request->alpha2[0] = alpha2[0]; | |
2779 | request->alpha2[1] = alpha2[1]; | |
2780 | request->initiator = NL80211_REGDOM_SET_BY_USER; | |
2781 | request->user_reg_hint_type = user_reg_hint_type; | |
2782 | ||
2783 | /* Allow calling CRDA again */ | |
2784 | reset_crda_timeouts(); | |
2785 | ||
2786 | queue_regulatory_request(request); | |
2787 | ||
2788 | return 0; | |
2789 | } | |
2790 | ||
2791 | int regulatory_hint_indoor(bool is_indoor, u32 portid) | |
2792 | { | |
2793 | spin_lock(®_indoor_lock); | |
2794 | ||
2795 | /* It is possible that more than one user space process is trying to | |
2796 | * configure the indoor setting. To handle such cases, clear the indoor | |
2797 | * setting in case that some process does not think that the device | |
2798 | * is operating in an indoor environment. In addition, if a user space | |
2799 | * process indicates that it is controlling the indoor setting, save its | |
2800 | * portid, i.e., make it the owner. | |
2801 | */ | |
2802 | reg_is_indoor = is_indoor; | |
2803 | if (reg_is_indoor) { | |
2804 | if (!reg_is_indoor_portid) | |
2805 | reg_is_indoor_portid = portid; | |
2806 | } else { | |
2807 | reg_is_indoor_portid = 0; | |
2808 | } | |
2809 | ||
2810 | spin_unlock(®_indoor_lock); | |
2811 | ||
2812 | if (!is_indoor) | |
2813 | reg_check_channels(); | |
2814 | ||
2815 | return 0; | |
2816 | } | |
2817 | ||
2818 | void regulatory_netlink_notify(u32 portid) | |
2819 | { | |
2820 | spin_lock(®_indoor_lock); | |
2821 | ||
2822 | if (reg_is_indoor_portid != portid) { | |
2823 | spin_unlock(®_indoor_lock); | |
2824 | return; | |
2825 | } | |
2826 | ||
2827 | reg_is_indoor = false; | |
2828 | reg_is_indoor_portid = 0; | |
2829 | ||
2830 | spin_unlock(®_indoor_lock); | |
2831 | ||
2832 | reg_check_channels(); | |
2833 | } | |
2834 | ||
2835 | /* Driver hints */ | |
2836 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
2837 | { | |
2838 | struct regulatory_request *request; | |
2839 | ||
2840 | if (WARN_ON(!alpha2 || !wiphy)) | |
2841 | return -EINVAL; | |
2842 | ||
2843 | wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG; | |
2844 | ||
2845 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
2846 | if (!request) | |
2847 | return -ENOMEM; | |
2848 | ||
2849 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
2850 | ||
2851 | request->alpha2[0] = alpha2[0]; | |
2852 | request->alpha2[1] = alpha2[1]; | |
2853 | request->initiator = NL80211_REGDOM_SET_BY_DRIVER; | |
2854 | ||
2855 | /* Allow calling CRDA again */ | |
2856 | reset_crda_timeouts(); | |
2857 | ||
2858 | queue_regulatory_request(request); | |
2859 | ||
2860 | return 0; | |
2861 | } | |
2862 | EXPORT_SYMBOL(regulatory_hint); | |
2863 | ||
2864 | void regulatory_hint_country_ie(struct wiphy *wiphy, enum nl80211_band band, | |
2865 | const u8 *country_ie, u8 country_ie_len) | |
2866 | { | |
2867 | char alpha2[2]; | |
2868 | enum environment_cap env = ENVIRON_ANY; | |
2869 | struct regulatory_request *request = NULL, *lr; | |
2870 | ||
2871 | /* IE len must be evenly divisible by 2 */ | |
2872 | if (country_ie_len & 0x01) | |
2873 | return; | |
2874 | ||
2875 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
2876 | return; | |
2877 | ||
2878 | request = kzalloc(sizeof(*request), GFP_KERNEL); | |
2879 | if (!request) | |
2880 | return; | |
2881 | ||
2882 | alpha2[0] = country_ie[0]; | |
2883 | alpha2[1] = country_ie[1]; | |
2884 | ||
2885 | if (country_ie[2] == 'I') | |
2886 | env = ENVIRON_INDOOR; | |
2887 | else if (country_ie[2] == 'O') | |
2888 | env = ENVIRON_OUTDOOR; | |
2889 | ||
2890 | rcu_read_lock(); | |
2891 | lr = get_last_request(); | |
2892 | ||
2893 | if (unlikely(!lr)) | |
2894 | goto out; | |
2895 | ||
2896 | /* | |
2897 | * We will run this only upon a successful connection on cfg80211. | |
2898 | * We leave conflict resolution to the workqueue, where can hold | |
2899 | * the RTNL. | |
2900 | */ | |
2901 | if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && | |
2902 | lr->wiphy_idx != WIPHY_IDX_INVALID) | |
2903 | goto out; | |
2904 | ||
2905 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
2906 | request->alpha2[0] = alpha2[0]; | |
2907 | request->alpha2[1] = alpha2[1]; | |
2908 | request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; | |
2909 | request->country_ie_env = env; | |
2910 | ||
2911 | /* Allow calling CRDA again */ | |
2912 | reset_crda_timeouts(); | |
2913 | ||
2914 | queue_regulatory_request(request); | |
2915 | request = NULL; | |
2916 | out: | |
2917 | kfree(request); | |
2918 | rcu_read_unlock(); | |
2919 | } | |
2920 | ||
2921 | static void restore_alpha2(char *alpha2, bool reset_user) | |
2922 | { | |
2923 | /* indicates there is no alpha2 to consider for restoration */ | |
2924 | alpha2[0] = '9'; | |
2925 | alpha2[1] = '7'; | |
2926 | ||
2927 | /* The user setting has precedence over the module parameter */ | |
2928 | if (is_user_regdom_saved()) { | |
2929 | /* Unless we're asked to ignore it and reset it */ | |
2930 | if (reset_user) { | |
2931 | pr_debug("Restoring regulatory settings including user preference\n"); | |
2932 | user_alpha2[0] = '9'; | |
2933 | user_alpha2[1] = '7'; | |
2934 | ||
2935 | /* | |
2936 | * If we're ignoring user settings, we still need to | |
2937 | * check the module parameter to ensure we put things | |
2938 | * back as they were for a full restore. | |
2939 | */ | |
2940 | if (!is_world_regdom(ieee80211_regdom)) { | |
2941 | pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n", | |
2942 | ieee80211_regdom[0], ieee80211_regdom[1]); | |
2943 | alpha2[0] = ieee80211_regdom[0]; | |
2944 | alpha2[1] = ieee80211_regdom[1]; | |
2945 | } | |
2946 | } else { | |
2947 | pr_debug("Restoring regulatory settings while preserving user preference for: %c%c\n", | |
2948 | user_alpha2[0], user_alpha2[1]); | |
2949 | alpha2[0] = user_alpha2[0]; | |
2950 | alpha2[1] = user_alpha2[1]; | |
2951 | } | |
2952 | } else if (!is_world_regdom(ieee80211_regdom)) { | |
2953 | pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n", | |
2954 | ieee80211_regdom[0], ieee80211_regdom[1]); | |
2955 | alpha2[0] = ieee80211_regdom[0]; | |
2956 | alpha2[1] = ieee80211_regdom[1]; | |
2957 | } else | |
2958 | pr_debug("Restoring regulatory settings\n"); | |
2959 | } | |
2960 | ||
2961 | static void restore_custom_reg_settings(struct wiphy *wiphy) | |
2962 | { | |
2963 | struct ieee80211_supported_band *sband; | |
2964 | enum nl80211_band band; | |
2965 | struct ieee80211_channel *chan; | |
2966 | int i; | |
2967 | ||
2968 | for (band = 0; band < NUM_NL80211_BANDS; band++) { | |
2969 | sband = wiphy->bands[band]; | |
2970 | if (!sband) | |
2971 | continue; | |
2972 | for (i = 0; i < sband->n_channels; i++) { | |
2973 | chan = &sband->channels[i]; | |
2974 | chan->flags = chan->orig_flags; | |
2975 | chan->max_antenna_gain = chan->orig_mag; | |
2976 | chan->max_power = chan->orig_mpwr; | |
2977 | chan->beacon_found = false; | |
2978 | } | |
2979 | } | |
2980 | } | |
2981 | ||
2982 | /* | |
2983 | * Restoring regulatory settings involves ingoring any | |
2984 | * possibly stale country IE information and user regulatory | |
2985 | * settings if so desired, this includes any beacon hints | |
2986 | * learned as we could have traveled outside to another country | |
2987 | * after disconnection. To restore regulatory settings we do | |
2988 | * exactly what we did at bootup: | |
2989 | * | |
2990 | * - send a core regulatory hint | |
2991 | * - send a user regulatory hint if applicable | |
2992 | * | |
2993 | * Device drivers that send a regulatory hint for a specific country | |
2994 | * keep their own regulatory domain on wiphy->regd so that does does | |
2995 | * not need to be remembered. | |
2996 | */ | |
2997 | static void restore_regulatory_settings(bool reset_user) | |
2998 | { | |
2999 | char alpha2[2]; | |
3000 | char world_alpha2[2]; | |
3001 | struct reg_beacon *reg_beacon, *btmp; | |
3002 | LIST_HEAD(tmp_reg_req_list); | |
3003 | struct cfg80211_registered_device *rdev; | |
3004 | ||
3005 | ASSERT_RTNL(); | |
3006 | ||
3007 | /* | |
3008 | * Clear the indoor setting in case that it is not controlled by user | |
3009 | * space, as otherwise there is no guarantee that the device is still | |
3010 | * operating in an indoor environment. | |
3011 | */ | |
3012 | spin_lock(®_indoor_lock); | |
3013 | if (reg_is_indoor && !reg_is_indoor_portid) { | |
3014 | reg_is_indoor = false; | |
3015 | reg_check_channels(); | |
3016 | } | |
3017 | spin_unlock(®_indoor_lock); | |
3018 | ||
3019 | reset_regdomains(true, &world_regdom); | |
3020 | restore_alpha2(alpha2, reset_user); | |
3021 | ||
3022 | /* | |
3023 | * If there's any pending requests we simply | |
3024 | * stash them to a temporary pending queue and | |
3025 | * add then after we've restored regulatory | |
3026 | * settings. | |
3027 | */ | |
3028 | spin_lock(®_requests_lock); | |
3029 | list_splice_tail_init(®_requests_list, &tmp_reg_req_list); | |
3030 | spin_unlock(®_requests_lock); | |
3031 | ||
3032 | /* Clear beacon hints */ | |
3033 | spin_lock_bh(®_pending_beacons_lock); | |
3034 | list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) { | |
3035 | list_del(®_beacon->list); | |
3036 | kfree(reg_beacon); | |
3037 | } | |
3038 | spin_unlock_bh(®_pending_beacons_lock); | |
3039 | ||
3040 | list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) { | |
3041 | list_del(®_beacon->list); | |
3042 | kfree(reg_beacon); | |
3043 | } | |
3044 | ||
3045 | /* First restore to the basic regulatory settings */ | |
3046 | world_alpha2[0] = cfg80211_world_regdom->alpha2[0]; | |
3047 | world_alpha2[1] = cfg80211_world_regdom->alpha2[1]; | |
3048 | ||
3049 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
3050 | if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) | |
3051 | continue; | |
3052 | if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG) | |
3053 | restore_custom_reg_settings(&rdev->wiphy); | |
3054 | } | |
3055 | ||
3056 | regulatory_hint_core(world_alpha2); | |
3057 | ||
3058 | /* | |
3059 | * This restores the ieee80211_regdom module parameter | |
3060 | * preference or the last user requested regulatory | |
3061 | * settings, user regulatory settings takes precedence. | |
3062 | */ | |
3063 | if (is_an_alpha2(alpha2)) | |
3064 | regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER); | |
3065 | ||
3066 | spin_lock(®_requests_lock); | |
3067 | list_splice_tail_init(&tmp_reg_req_list, ®_requests_list); | |
3068 | spin_unlock(®_requests_lock); | |
3069 | ||
3070 | pr_debug("Kicking the queue\n"); | |
3071 | ||
3072 | schedule_work(®_work); | |
3073 | } | |
3074 | ||
3075 | static bool is_wiphy_all_set_reg_flag(enum ieee80211_regulatory_flags flag) | |
3076 | { | |
3077 | struct cfg80211_registered_device *rdev; | |
3078 | struct wireless_dev *wdev; | |
3079 | ||
3080 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
3081 | list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { | |
3082 | wdev_lock(wdev); | |
3083 | if (!(wdev->wiphy->regulatory_flags & flag)) { | |
3084 | wdev_unlock(wdev); | |
3085 | return false; | |
3086 | } | |
3087 | wdev_unlock(wdev); | |
3088 | } | |
3089 | } | |
3090 | ||
3091 | return true; | |
3092 | } | |
3093 | ||
3094 | void regulatory_hint_disconnect(void) | |
3095 | { | |
3096 | /* Restore of regulatory settings is not required when wiphy(s) | |
3097 | * ignore IE from connected access point but clearance of beacon hints | |
3098 | * is required when wiphy(s) supports beacon hints. | |
3099 | */ | |
3100 | if (is_wiphy_all_set_reg_flag(REGULATORY_COUNTRY_IE_IGNORE)) { | |
3101 | struct reg_beacon *reg_beacon, *btmp; | |
3102 | ||
3103 | if (is_wiphy_all_set_reg_flag(REGULATORY_DISABLE_BEACON_HINTS)) | |
3104 | return; | |
3105 | ||
3106 | spin_lock_bh(®_pending_beacons_lock); | |
3107 | list_for_each_entry_safe(reg_beacon, btmp, | |
3108 | ®_pending_beacons, list) { | |
3109 | list_del(®_beacon->list); | |
3110 | kfree(reg_beacon); | |
3111 | } | |
3112 | spin_unlock_bh(®_pending_beacons_lock); | |
3113 | ||
3114 | list_for_each_entry_safe(reg_beacon, btmp, | |
3115 | ®_beacon_list, list) { | |
3116 | list_del(®_beacon->list); | |
3117 | kfree(reg_beacon); | |
3118 | } | |
3119 | ||
3120 | return; | |
3121 | } | |
3122 | ||
3123 | pr_debug("All devices are disconnected, going to restore regulatory settings\n"); | |
3124 | restore_regulatory_settings(false); | |
3125 | } | |
3126 | ||
3127 | static bool freq_is_chan_12_13_14(u16 freq) | |
3128 | { | |
3129 | if (freq == ieee80211_channel_to_frequency(12, NL80211_BAND_2GHZ) || | |
3130 | freq == ieee80211_channel_to_frequency(13, NL80211_BAND_2GHZ) || | |
3131 | freq == ieee80211_channel_to_frequency(14, NL80211_BAND_2GHZ)) | |
3132 | return true; | |
3133 | return false; | |
3134 | } | |
3135 | ||
3136 | static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan) | |
3137 | { | |
3138 | struct reg_beacon *pending_beacon; | |
3139 | ||
3140 | list_for_each_entry(pending_beacon, ®_pending_beacons, list) | |
3141 | if (beacon_chan->center_freq == | |
3142 | pending_beacon->chan.center_freq) | |
3143 | return true; | |
3144 | return false; | |
3145 | } | |
3146 | ||
3147 | int regulatory_hint_found_beacon(struct wiphy *wiphy, | |
3148 | struct ieee80211_channel *beacon_chan, | |
3149 | gfp_t gfp) | |
3150 | { | |
3151 | struct reg_beacon *reg_beacon; | |
3152 | bool processing; | |
3153 | ||
3154 | if (beacon_chan->beacon_found || | |
3155 | beacon_chan->flags & IEEE80211_CHAN_RADAR || | |
3156 | (beacon_chan->band == NL80211_BAND_2GHZ && | |
3157 | !freq_is_chan_12_13_14(beacon_chan->center_freq))) | |
3158 | return 0; | |
3159 | ||
3160 | spin_lock_bh(®_pending_beacons_lock); | |
3161 | processing = pending_reg_beacon(beacon_chan); | |
3162 | spin_unlock_bh(®_pending_beacons_lock); | |
3163 | ||
3164 | if (processing) | |
3165 | return 0; | |
3166 | ||
3167 | reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); | |
3168 | if (!reg_beacon) | |
3169 | return -ENOMEM; | |
3170 | ||
3171 | pr_debug("Found new beacon on frequency: %d MHz (Ch %d) on %s\n", | |
3172 | beacon_chan->center_freq, | |
3173 | ieee80211_frequency_to_channel(beacon_chan->center_freq), | |
3174 | wiphy_name(wiphy)); | |
3175 | ||
3176 | memcpy(®_beacon->chan, beacon_chan, | |
3177 | sizeof(struct ieee80211_channel)); | |
3178 | ||
3179 | /* | |
3180 | * Since we can be called from BH or and non-BH context | |
3181 | * we must use spin_lock_bh() | |
3182 | */ | |
3183 | spin_lock_bh(®_pending_beacons_lock); | |
3184 | list_add_tail(®_beacon->list, ®_pending_beacons); | |
3185 | spin_unlock_bh(®_pending_beacons_lock); | |
3186 | ||
3187 | schedule_work(®_work); | |
3188 | ||
3189 | return 0; | |
3190 | } | |
3191 | ||
3192 | static void print_rd_rules(const struct ieee80211_regdomain *rd) | |
3193 | { | |
3194 | unsigned int i; | |
3195 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
3196 | const struct ieee80211_freq_range *freq_range = NULL; | |
3197 | const struct ieee80211_power_rule *power_rule = NULL; | |
3198 | char bw[32], cac_time[32]; | |
3199 | ||
3200 | pr_debug(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n"); | |
3201 | ||
3202 | for (i = 0; i < rd->n_reg_rules; i++) { | |
3203 | reg_rule = &rd->reg_rules[i]; | |
3204 | freq_range = ®_rule->freq_range; | |
3205 | power_rule = ®_rule->power_rule; | |
3206 | ||
3207 | if (reg_rule->flags & NL80211_RRF_AUTO_BW) | |
3208 | snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO", | |
3209 | freq_range->max_bandwidth_khz, | |
3210 | reg_get_max_bandwidth(rd, reg_rule)); | |
3211 | else | |
3212 | snprintf(bw, sizeof(bw), "%d KHz", | |
3213 | freq_range->max_bandwidth_khz); | |
3214 | ||
3215 | if (reg_rule->flags & NL80211_RRF_DFS) | |
3216 | scnprintf(cac_time, sizeof(cac_time), "%u s", | |
3217 | reg_rule->dfs_cac_ms/1000); | |
3218 | else | |
3219 | scnprintf(cac_time, sizeof(cac_time), "N/A"); | |
3220 | ||
3221 | ||
3222 | /* | |
3223 | * There may not be documentation for max antenna gain | |
3224 | * in certain regions | |
3225 | */ | |
3226 | if (power_rule->max_antenna_gain) | |
3227 | pr_debug(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n", | |
3228 | freq_range->start_freq_khz, | |
3229 | freq_range->end_freq_khz, | |
3230 | bw, | |
3231 | power_rule->max_antenna_gain, | |
3232 | power_rule->max_eirp, | |
3233 | cac_time); | |
3234 | else | |
3235 | pr_debug(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n", | |
3236 | freq_range->start_freq_khz, | |
3237 | freq_range->end_freq_khz, | |
3238 | bw, | |
3239 | power_rule->max_eirp, | |
3240 | cac_time); | |
3241 | } | |
3242 | } | |
3243 | ||
3244 | bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region) | |
3245 | { | |
3246 | switch (dfs_region) { | |
3247 | case NL80211_DFS_UNSET: | |
3248 | case NL80211_DFS_FCC: | |
3249 | case NL80211_DFS_ETSI: | |
3250 | case NL80211_DFS_JP: | |
3251 | return true; | |
3252 | default: | |
3253 | pr_debug("Ignoring uknown DFS master region: %d\n", dfs_region); | |
3254 | return false; | |
3255 | } | |
3256 | } | |
3257 | ||
3258 | static void print_regdomain(const struct ieee80211_regdomain *rd) | |
3259 | { | |
3260 | struct regulatory_request *lr = get_last_request(); | |
3261 | ||
3262 | if (is_intersected_alpha2(rd->alpha2)) { | |
3263 | if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) { | |
3264 | struct cfg80211_registered_device *rdev; | |
3265 | rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx); | |
3266 | if (rdev) { | |
3267 | pr_debug("Current regulatory domain updated by AP to: %c%c\n", | |
3268 | rdev->country_ie_alpha2[0], | |
3269 | rdev->country_ie_alpha2[1]); | |
3270 | } else | |
3271 | pr_debug("Current regulatory domain intersected:\n"); | |
3272 | } else | |
3273 | pr_debug("Current regulatory domain intersected:\n"); | |
3274 | } else if (is_world_regdom(rd->alpha2)) { | |
3275 | pr_debug("World regulatory domain updated:\n"); | |
3276 | } else { | |
3277 | if (is_unknown_alpha2(rd->alpha2)) | |
3278 | pr_debug("Regulatory domain changed to driver built-in settings (unknown country)\n"); | |
3279 | else { | |
3280 | if (reg_request_cell_base(lr)) | |
3281 | pr_debug("Regulatory domain changed to country: %c%c by Cell Station\n", | |
3282 | rd->alpha2[0], rd->alpha2[1]); | |
3283 | else | |
3284 | pr_debug("Regulatory domain changed to country: %c%c\n", | |
3285 | rd->alpha2[0], rd->alpha2[1]); | |
3286 | } | |
3287 | } | |
3288 | ||
3289 | pr_debug(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region)); | |
3290 | print_rd_rules(rd); | |
3291 | } | |
3292 | ||
3293 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) | |
3294 | { | |
3295 | pr_debug("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]); | |
3296 | print_rd_rules(rd); | |
3297 | } | |
3298 | ||
3299 | static int reg_set_rd_core(const struct ieee80211_regdomain *rd) | |
3300 | { | |
3301 | if (!is_world_regdom(rd->alpha2)) | |
3302 | return -EINVAL; | |
3303 | update_world_regdomain(rd); | |
3304 | return 0; | |
3305 | } | |
3306 | ||
3307 | static int reg_set_rd_user(const struct ieee80211_regdomain *rd, | |
3308 | struct regulatory_request *user_request) | |
3309 | { | |
3310 | const struct ieee80211_regdomain *intersected_rd = NULL; | |
3311 | ||
3312 | if (!regdom_changes(rd->alpha2)) | |
3313 | return -EALREADY; | |
3314 | ||
3315 | if (!is_valid_rd(rd)) { | |
3316 | pr_err("Invalid regulatory domain detected: %c%c\n", | |
3317 | rd->alpha2[0], rd->alpha2[1]); | |
3318 | print_regdomain_info(rd); | |
3319 | return -EINVAL; | |
3320 | } | |
3321 | ||
3322 | if (!user_request->intersect) { | |
3323 | reset_regdomains(false, rd); | |
3324 | return 0; | |
3325 | } | |
3326 | ||
3327 | intersected_rd = regdom_intersect(rd, get_cfg80211_regdom()); | |
3328 | if (!intersected_rd) | |
3329 | return -EINVAL; | |
3330 | ||
3331 | kfree(rd); | |
3332 | rd = NULL; | |
3333 | reset_regdomains(false, intersected_rd); | |
3334 | ||
3335 | return 0; | |
3336 | } | |
3337 | ||
3338 | static int reg_set_rd_driver(const struct ieee80211_regdomain *rd, | |
3339 | struct regulatory_request *driver_request) | |
3340 | { | |
3341 | const struct ieee80211_regdomain *regd; | |
3342 | const struct ieee80211_regdomain *intersected_rd = NULL; | |
3343 | const struct ieee80211_regdomain *tmp; | |
3344 | struct wiphy *request_wiphy; | |
3345 | ||
3346 | if (is_world_regdom(rd->alpha2)) | |
3347 | return -EINVAL; | |
3348 | ||
3349 | if (!regdom_changes(rd->alpha2)) | |
3350 | return -EALREADY; | |
3351 | ||
3352 | if (!is_valid_rd(rd)) { | |
3353 | pr_err("Invalid regulatory domain detected: %c%c\n", | |
3354 | rd->alpha2[0], rd->alpha2[1]); | |
3355 | print_regdomain_info(rd); | |
3356 | return -EINVAL; | |
3357 | } | |
3358 | ||
3359 | request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx); | |
3360 | if (!request_wiphy) | |
3361 | return -ENODEV; | |
3362 | ||
3363 | if (!driver_request->intersect) { | |
3364 | if (request_wiphy->regd) | |
3365 | return -EALREADY; | |
3366 | ||
3367 | regd = reg_copy_regd(rd); | |
3368 | if (IS_ERR(regd)) | |
3369 | return PTR_ERR(regd); | |
3370 | ||
3371 | rcu_assign_pointer(request_wiphy->regd, regd); | |
3372 | reset_regdomains(false, rd); | |
3373 | return 0; | |
3374 | } | |
3375 | ||
3376 | intersected_rd = regdom_intersect(rd, get_cfg80211_regdom()); | |
3377 | if (!intersected_rd) | |
3378 | return -EINVAL; | |
3379 | ||
3380 | /* | |
3381 | * We can trash what CRDA provided now. | |
3382 | * However if a driver requested this specific regulatory | |
3383 | * domain we keep it for its private use | |
3384 | */ | |
3385 | tmp = get_wiphy_regdom(request_wiphy); | |
3386 | rcu_assign_pointer(request_wiphy->regd, rd); | |
3387 | rcu_free_regdom(tmp); | |
3388 | ||
3389 | rd = NULL; | |
3390 | ||
3391 | reset_regdomains(false, intersected_rd); | |
3392 | ||
3393 | return 0; | |
3394 | } | |
3395 | ||
3396 | static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd, | |
3397 | struct regulatory_request *country_ie_request) | |
3398 | { | |
3399 | struct wiphy *request_wiphy; | |
3400 | ||
3401 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
3402 | !is_unknown_alpha2(rd->alpha2)) | |
3403 | return -EINVAL; | |
3404 | ||
3405 | /* | |
3406 | * Lets only bother proceeding on the same alpha2 if the current | |
3407 | * rd is non static (it means CRDA was present and was used last) | |
3408 | * and the pending request came in from a country IE | |
3409 | */ | |
3410 | ||
3411 | if (!is_valid_rd(rd)) { | |
3412 | pr_err("Invalid regulatory domain detected: %c%c\n", | |
3413 | rd->alpha2[0], rd->alpha2[1]); | |
3414 | print_regdomain_info(rd); | |
3415 | return -EINVAL; | |
3416 | } | |
3417 | ||
3418 | request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx); | |
3419 | if (!request_wiphy) | |
3420 | return -ENODEV; | |
3421 | ||
3422 | if (country_ie_request->intersect) | |
3423 | return -EINVAL; | |
3424 | ||
3425 | reset_regdomains(false, rd); | |
3426 | return 0; | |
3427 | } | |
3428 | ||
3429 | /* | |
3430 | * Use this call to set the current regulatory domain. Conflicts with | |
3431 | * multiple drivers can be ironed out later. Caller must've already | |
3432 | * kmalloc'd the rd structure. | |
3433 | */ | |
3434 | int set_regdom(const struct ieee80211_regdomain *rd, | |
3435 | enum ieee80211_regd_source regd_src) | |
3436 | { | |
3437 | struct regulatory_request *lr; | |
3438 | bool user_reset = false; | |
3439 | int r; | |
3440 | ||
3441 | if (!reg_is_valid_request(rd->alpha2)) { | |
3442 | kfree(rd); | |
3443 | return -EINVAL; | |
3444 | } | |
3445 | ||
3446 | if (regd_src == REGD_SOURCE_CRDA) | |
3447 | reset_crda_timeouts(); | |
3448 | ||
3449 | lr = get_last_request(); | |
3450 | ||
3451 | /* Note that this doesn't update the wiphys, this is done below */ | |
3452 | switch (lr->initiator) { | |
3453 | case NL80211_REGDOM_SET_BY_CORE: | |
3454 | r = reg_set_rd_core(rd); | |
3455 | break; | |
3456 | case NL80211_REGDOM_SET_BY_USER: | |
3457 | r = reg_set_rd_user(rd, lr); | |
3458 | user_reset = true; | |
3459 | break; | |
3460 | case NL80211_REGDOM_SET_BY_DRIVER: | |
3461 | r = reg_set_rd_driver(rd, lr); | |
3462 | break; | |
3463 | case NL80211_REGDOM_SET_BY_COUNTRY_IE: | |
3464 | r = reg_set_rd_country_ie(rd, lr); | |
3465 | break; | |
3466 | default: | |
3467 | WARN(1, "invalid initiator %d\n", lr->initiator); | |
3468 | kfree(rd); | |
3469 | return -EINVAL; | |
3470 | } | |
3471 | ||
3472 | if (r) { | |
3473 | switch (r) { | |
3474 | case -EALREADY: | |
3475 | reg_set_request_processed(); | |
3476 | break; | |
3477 | default: | |
3478 | /* Back to world regulatory in case of errors */ | |
3479 | restore_regulatory_settings(user_reset); | |
3480 | } | |
3481 | ||
3482 | kfree(rd); | |
3483 | return r; | |
3484 | } | |
3485 | ||
3486 | /* This would make this whole thing pointless */ | |
3487 | if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom())) | |
3488 | return -EINVAL; | |
3489 | ||
3490 | /* update all wiphys now with the new established regulatory domain */ | |
3491 | update_all_wiphy_regulatory(lr->initiator); | |
3492 | ||
3493 | print_regdomain(get_cfg80211_regdom()); | |
3494 | ||
3495 | nl80211_send_reg_change_event(lr); | |
3496 | ||
3497 | reg_set_request_processed(); | |
3498 | ||
3499 | return 0; | |
3500 | } | |
3501 | ||
3502 | static int __regulatory_set_wiphy_regd(struct wiphy *wiphy, | |
3503 | struct ieee80211_regdomain *rd) | |
3504 | { | |
3505 | const struct ieee80211_regdomain *regd; | |
3506 | const struct ieee80211_regdomain *prev_regd; | |
3507 | struct cfg80211_registered_device *rdev; | |
3508 | ||
3509 | if (WARN_ON(!wiphy || !rd)) | |
3510 | return -EINVAL; | |
3511 | ||
3512 | if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED), | |
3513 | "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n")) | |
3514 | return -EPERM; | |
3515 | ||
3516 | if (WARN(!is_valid_rd(rd), "Invalid regulatory domain detected\n")) { | |
3517 | print_regdomain_info(rd); | |
3518 | return -EINVAL; | |
3519 | } | |
3520 | ||
3521 | regd = reg_copy_regd(rd); | |
3522 | if (IS_ERR(regd)) | |
3523 | return PTR_ERR(regd); | |
3524 | ||
3525 | rdev = wiphy_to_rdev(wiphy); | |
3526 | ||
3527 | spin_lock(®_requests_lock); | |
3528 | prev_regd = rdev->requested_regd; | |
3529 | rdev->requested_regd = regd; | |
3530 | spin_unlock(®_requests_lock); | |
3531 | ||
3532 | kfree(prev_regd); | |
3533 | return 0; | |
3534 | } | |
3535 | ||
3536 | int regulatory_set_wiphy_regd(struct wiphy *wiphy, | |
3537 | struct ieee80211_regdomain *rd) | |
3538 | { | |
3539 | int ret = __regulatory_set_wiphy_regd(wiphy, rd); | |
3540 | ||
3541 | if (ret) | |
3542 | return ret; | |
3543 | ||
3544 | schedule_work(®_work); | |
3545 | return 0; | |
3546 | } | |
3547 | EXPORT_SYMBOL(regulatory_set_wiphy_regd); | |
3548 | ||
3549 | int regulatory_set_wiphy_regd_sync_rtnl(struct wiphy *wiphy, | |
3550 | struct ieee80211_regdomain *rd) | |
3551 | { | |
3552 | int ret; | |
3553 | ||
3554 | ASSERT_RTNL(); | |
3555 | ||
3556 | ret = __regulatory_set_wiphy_regd(wiphy, rd); | |
3557 | if (ret) | |
3558 | return ret; | |
3559 | ||
3560 | /* process the request immediately */ | |
3561 | reg_process_self_managed_hints(); | |
3562 | return 0; | |
3563 | } | |
3564 | EXPORT_SYMBOL(regulatory_set_wiphy_regd_sync_rtnl); | |
3565 | ||
3566 | void wiphy_regulatory_register(struct wiphy *wiphy) | |
3567 | { | |
3568 | struct regulatory_request *lr; | |
3569 | ||
3570 | /* self-managed devices ignore external hints */ | |
3571 | if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) | |
3572 | wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS | | |
3573 | REGULATORY_COUNTRY_IE_IGNORE; | |
3574 | ||
3575 | if (!reg_dev_ignore_cell_hint(wiphy)) | |
3576 | reg_num_devs_support_basehint++; | |
3577 | ||
3578 | lr = get_last_request(); | |
3579 | wiphy_update_regulatory(wiphy, lr->initiator); | |
3580 | wiphy_all_share_dfs_chan_state(wiphy); | |
3581 | } | |
3582 | ||
3583 | void wiphy_regulatory_deregister(struct wiphy *wiphy) | |
3584 | { | |
3585 | struct wiphy *request_wiphy = NULL; | |
3586 | struct regulatory_request *lr; | |
3587 | ||
3588 | lr = get_last_request(); | |
3589 | ||
3590 | if (!reg_dev_ignore_cell_hint(wiphy)) | |
3591 | reg_num_devs_support_basehint--; | |
3592 | ||
3593 | rcu_free_regdom(get_wiphy_regdom(wiphy)); | |
3594 | RCU_INIT_POINTER(wiphy->regd, NULL); | |
3595 | ||
3596 | if (lr) | |
3597 | request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx); | |
3598 | ||
3599 | if (!request_wiphy || request_wiphy != wiphy) | |
3600 | return; | |
3601 | ||
3602 | lr->wiphy_idx = WIPHY_IDX_INVALID; | |
3603 | lr->country_ie_env = ENVIRON_ANY; | |
3604 | } | |
3605 | ||
3606 | /* | |
3607 | * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for | |
3608 | * UNII band definitions | |
3609 | */ | |
3610 | int cfg80211_get_unii(int freq) | |
3611 | { | |
3612 | /* UNII-1 */ | |
3613 | if (freq >= 5150 && freq <= 5250) | |
3614 | return 0; | |
3615 | ||
3616 | /* UNII-2A */ | |
3617 | if (freq > 5250 && freq <= 5350) | |
3618 | return 1; | |
3619 | ||
3620 | /* UNII-2B */ | |
3621 | if (freq > 5350 && freq <= 5470) | |
3622 | return 2; | |
3623 | ||
3624 | /* UNII-2C */ | |
3625 | if (freq > 5470 && freq <= 5725) | |
3626 | return 3; | |
3627 | ||
3628 | /* UNII-3 */ | |
3629 | if (freq > 5725 && freq <= 5825) | |
3630 | return 4; | |
3631 | ||
3632 | return -EINVAL; | |
3633 | } | |
3634 | ||
3635 | bool regulatory_indoor_allowed(void) | |
3636 | { | |
3637 | return reg_is_indoor; | |
3638 | } | |
3639 | ||
3640 | bool regulatory_pre_cac_allowed(struct wiphy *wiphy) | |
3641 | { | |
3642 | const struct ieee80211_regdomain *regd = NULL; | |
3643 | const struct ieee80211_regdomain *wiphy_regd = NULL; | |
3644 | bool pre_cac_allowed = false; | |
3645 | ||
3646 | rcu_read_lock(); | |
3647 | ||
3648 | regd = rcu_dereference(cfg80211_regdomain); | |
3649 | wiphy_regd = rcu_dereference(wiphy->regd); | |
3650 | if (!wiphy_regd) { | |
3651 | if (regd->dfs_region == NL80211_DFS_ETSI) | |
3652 | pre_cac_allowed = true; | |
3653 | ||
3654 | rcu_read_unlock(); | |
3655 | ||
3656 | return pre_cac_allowed; | |
3657 | } | |
3658 | ||
3659 | if (regd->dfs_region == wiphy_regd->dfs_region && | |
3660 | wiphy_regd->dfs_region == NL80211_DFS_ETSI) | |
3661 | pre_cac_allowed = true; | |
3662 | ||
3663 | rcu_read_unlock(); | |
3664 | ||
3665 | return pre_cac_allowed; | |
3666 | } | |
3667 | ||
3668 | static void cfg80211_check_and_end_cac(struct cfg80211_registered_device *rdev) | |
3669 | { | |
3670 | struct wireless_dev *wdev; | |
3671 | /* If we finished CAC or received radar, we should end any | |
3672 | * CAC running on the same channels. | |
3673 | * the check !cfg80211_chandef_dfs_usable contain 2 options: | |
3674 | * either all channels are available - those the CAC_FINISHED | |
3675 | * event has effected another wdev state, or there is a channel | |
3676 | * in unavailable state in wdev chandef - those the RADAR_DETECTED | |
3677 | * event has effected another wdev state. | |
3678 | * In both cases we should end the CAC on the wdev. | |
3679 | */ | |
3680 | list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { | |
3681 | if (wdev->cac_started && | |
3682 | !cfg80211_chandef_dfs_usable(&rdev->wiphy, &wdev->chandef)) | |
3683 | rdev_end_cac(rdev, wdev->netdev); | |
3684 | } | |
3685 | } | |
3686 | ||
3687 | void regulatory_propagate_dfs_state(struct wiphy *wiphy, | |
3688 | struct cfg80211_chan_def *chandef, | |
3689 | enum nl80211_dfs_state dfs_state, | |
3690 | enum nl80211_radar_event event) | |
3691 | { | |
3692 | struct cfg80211_registered_device *rdev; | |
3693 | ||
3694 | ASSERT_RTNL(); | |
3695 | ||
3696 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
3697 | return; | |
3698 | ||
3699 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
3700 | if (wiphy == &rdev->wiphy) | |
3701 | continue; | |
3702 | ||
3703 | if (!reg_dfs_domain_same(wiphy, &rdev->wiphy)) | |
3704 | continue; | |
3705 | ||
3706 | if (!ieee80211_get_channel(&rdev->wiphy, | |
3707 | chandef->chan->center_freq)) | |
3708 | continue; | |
3709 | ||
3710 | cfg80211_set_dfs_state(&rdev->wiphy, chandef, dfs_state); | |
3711 | ||
3712 | if (event == NL80211_RADAR_DETECTED || | |
3713 | event == NL80211_RADAR_CAC_FINISHED) { | |
3714 | cfg80211_sched_dfs_chan_update(rdev); | |
3715 | cfg80211_check_and_end_cac(rdev); | |
3716 | } | |
3717 | ||
3718 | nl80211_radar_notify(rdev, chandef, event, NULL, GFP_KERNEL); | |
3719 | } | |
3720 | } | |
3721 | ||
3722 | static int __init regulatory_init_db(void) | |
3723 | { | |
3724 | int err; | |
3725 | ||
3726 | /* | |
3727 | * It's possible that - due to other bugs/issues - cfg80211 | |
3728 | * never called regulatory_init() below, or that it failed; | |
3729 | * in that case, don't try to do any further work here as | |
3730 | * it's doomed to lead to crashes. | |
3731 | */ | |
3732 | if (IS_ERR_OR_NULL(reg_pdev)) | |
3733 | return -EINVAL; | |
3734 | ||
3735 | err = load_builtin_regdb_keys(); | |
3736 | if (err) | |
3737 | return err; | |
3738 | ||
3739 | /* We always try to get an update for the static regdomain */ | |
3740 | err = regulatory_hint_core(cfg80211_world_regdom->alpha2); | |
3741 | if (err) { | |
3742 | if (err == -ENOMEM) { | |
3743 | platform_device_unregister(reg_pdev); | |
3744 | return err; | |
3745 | } | |
3746 | /* | |
3747 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
3748 | * memory which is handled and propagated appropriately above | |
3749 | * but it can also fail during a netlink_broadcast() or during | |
3750 | * early boot for call_usermodehelper(). For now treat these | |
3751 | * errors as non-fatal. | |
3752 | */ | |
3753 | pr_err("kobject_uevent_env() was unable to call CRDA during init\n"); | |
3754 | } | |
3755 | ||
3756 | /* | |
3757 | * Finally, if the user set the module parameter treat it | |
3758 | * as a user hint. | |
3759 | */ | |
3760 | if (!is_world_regdom(ieee80211_regdom)) | |
3761 | regulatory_hint_user(ieee80211_regdom, | |
3762 | NL80211_USER_REG_HINT_USER); | |
3763 | ||
3764 | return 0; | |
3765 | } | |
3766 | #ifndef MODULE | |
3767 | late_initcall(regulatory_init_db); | |
3768 | #endif | |
3769 | ||
3770 | int __init regulatory_init(void) | |
3771 | { | |
3772 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); | |
3773 | if (IS_ERR(reg_pdev)) | |
3774 | return PTR_ERR(reg_pdev); | |
3775 | ||
3776 | spin_lock_init(®_requests_lock); | |
3777 | spin_lock_init(®_pending_beacons_lock); | |
3778 | spin_lock_init(®_indoor_lock); | |
3779 | ||
3780 | rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom); | |
3781 | ||
3782 | user_alpha2[0] = '9'; | |
3783 | user_alpha2[1] = '7'; | |
3784 | ||
3785 | #ifdef MODULE | |
3786 | return regulatory_init_db(); | |
3787 | #else | |
3788 | return 0; | |
3789 | #endif | |
3790 | } | |
3791 | ||
3792 | void regulatory_exit(void) | |
3793 | { | |
3794 | struct regulatory_request *reg_request, *tmp; | |
3795 | struct reg_beacon *reg_beacon, *btmp; | |
3796 | ||
3797 | cancel_work_sync(®_work); | |
3798 | cancel_crda_timeout_sync(); | |
3799 | cancel_delayed_work_sync(®_check_chans); | |
3800 | ||
3801 | /* Lock to suppress warnings */ | |
3802 | rtnl_lock(); | |
3803 | reset_regdomains(true, NULL); | |
3804 | rtnl_unlock(); | |
3805 | ||
3806 | dev_set_uevent_suppress(®_pdev->dev, true); | |
3807 | ||
3808 | platform_device_unregister(reg_pdev); | |
3809 | ||
3810 | list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) { | |
3811 | list_del(®_beacon->list); | |
3812 | kfree(reg_beacon); | |
3813 | } | |
3814 | ||
3815 | list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) { | |
3816 | list_del(®_beacon->list); | |
3817 | kfree(reg_beacon); | |
3818 | } | |
3819 | ||
3820 | list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) { | |
3821 | list_del(®_request->list); | |
3822 | kfree(reg_request); | |
3823 | } | |
3824 | ||
3825 | if (!IS_ERR_OR_NULL(regdb)) | |
3826 | kfree(regdb); | |
3827 | ||
3828 | free_regdb_keyring(); | |
3829 | } |