blob: e9a0ac83b84c2798961e59b1045a2e09d52b0a5d [file] [log] [blame]
Johannes Berg8318d782008-01-24 19:38:38 +01001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
Luis R. Rodriguez3b77d5e2011-12-20 12:23:38 -08005 * Copyright 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Johannes Berg8318d782008-01-24 19:38:38 +01006 *
Luis R. Rodriguez3b77d5e2011-12-20 12:23:38 -08007 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Johannes Berg8318d782008-01-24 19:38:38 +010018 */
19
Luis R. Rodriguez3b77d5e2011-12-20 12:23:38 -080020
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070021/**
22 * DOC: Wireless regulatory infrastructure
Johannes Berg8318d782008-01-24 19:38:38 +010023 *
24 * The usual implementation is for a driver to read a device EEPROM to
25 * determine which regulatory domain it should be operating under, then
26 * looking up the allowable channels in a driver-local table and finally
27 * registering those channels in the wiphy structure.
28 *
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070029 * Another set of compliance enforcement is for drivers to use their
30 * own compliance limits which can be stored on the EEPROM. The host
31 * driver or firmware may ensure these are used.
32 *
33 * In addition to all this we provide an extra layer of regulatory
34 * conformance. For drivers which do not have any regulatory
35 * information CRDA provides the complete regulatory solution.
36 * For others it provides a community effort on further restrictions
37 * to enhance compliance.
38 *
39 * Note: When number of rules --> infinity we will not be able to
40 * index on alpha2 any more, instead we'll probably have to
41 * rely on some SHA1 checksum of the regdomain for example.
42 *
Johannes Berg8318d782008-01-24 19:38:38 +010043 */
Joe Perchese9c02682010-11-16 19:56:49 -080044
45#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46
Johannes Berg8318d782008-01-24 19:38:38 +010047#include <linux/kernel.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040048#include <linux/export.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090049#include <linux/slab.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070050#include <linux/list.h>
51#include <linux/random.h>
John W. Linvillec61029c2010-08-05 14:26:24 -040052#include <linux/ctype.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070053#include <linux/nl80211.h>
54#include <linux/platform_device.h>
Paul Gortmakerd9b93842011-09-18 13:21:27 -040055#include <linux/moduleparam.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070056#include <net/cfg80211.h>
Johannes Berg8318d782008-01-24 19:38:38 +010057#include "core.h"
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070058#include "reg.h"
John W. Linville3b377ea2009-12-18 17:59:01 -050059#include "regdb.h"
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -040060#include "nl80211.h"
Johannes Berg8318d782008-01-24 19:38:38 +010061
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050062#ifdef CONFIG_CFG80211_REG_DEBUG
Joe Perches12c5ffb2011-07-29 14:51:25 -070063#define REG_DBG_PRINT(format, args...) \
64 printk(KERN_DEBUG pr_fmt(format), ##args)
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050065#else
John W. Linville82711952010-01-05 17:57:20 -050066#define REG_DBG_PRINT(args...)
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050067#endif
68
Luis R. Rodrigueza0429942011-11-28 16:47:15 -050069static struct regulatory_request core_request_world = {
70 .initiator = NL80211_REGDOM_SET_BY_CORE,
71 .alpha2[0] = '0',
72 .alpha2[1] = '0',
73 .intersect = false,
74 .processed = true,
75 .country_ie_env = ENVIRON_ANY,
76};
77
Luis R. Rodriguez5166ccd2008-10-30 13:33:56 -070078/* Receipt of information from last regulatory request */
Luis R. Rodrigueza0429942011-11-28 16:47:15 -050079static struct regulatory_request *last_request = &core_request_world;
Johannes Berg734366d2008-09-15 10:56:48 +020080
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070081/* To trigger userspace events */
82static struct platform_device *reg_pdev;
Johannes Berg8318d782008-01-24 19:38:38 +010083
Scott James Remnant4d9d88d2011-03-08 10:45:30 -080084static struct device_type reg_device_type = {
85 .uevent = reg_device_uevent,
86};
87
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050088/*
89 * Central wireless core regulatory domains, we only need two,
Johannes Berg734366d2008-09-15 10:56:48 +020090 * the current one and a world regulatory domain in case we have no
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050091 * information to give us an alpha2
92 */
Luis R. Rodriguezf1303472009-01-30 09:26:42 -080093const struct ieee80211_regdomain *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +020094
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050095/*
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070096 * Protects static reg.c components:
97 * - cfg80211_world_regdom
98 * - cfg80211_regdom
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070099 * - last_request
100 */
John W. Linville670b7f12010-06-24 11:26:31 -0400101static DEFINE_MUTEX(reg_mutex);
Johannes Berg46a5eba2010-09-15 13:28:15 +0200102
103static inline void assert_reg_lock(void)
104{
105 lockdep_assert_held(&reg_mutex);
106}
Luis R. Rodriguezabc73812009-07-30 17:38:08 -0700107
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500108/* Used to queue up regulatory hints */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500109static LIST_HEAD(reg_requests_list);
110static spinlock_t reg_requests_lock;
111
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500112/* Used to queue up beacon hints for review */
113static LIST_HEAD(reg_pending_beacons);
114static spinlock_t reg_pending_beacons_lock;
115
116/* Used to keep track of processed beacon hints */
117static LIST_HEAD(reg_beacon_list);
118
119struct reg_beacon {
120 struct list_head list;
121 struct ieee80211_channel chan;
122};
123
Luis R. Rodriguezf333a7a2010-11-17 21:46:07 -0800124static void reg_todo(struct work_struct *work);
125static DECLARE_WORK(reg_work, reg_todo);
126
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -0700127static void reg_timeout_work(struct work_struct *work);
128static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
129
Johannes Berg734366d2008-09-15 10:56:48 +0200130/* We keep a static world regulatory domain in case of the absence of CRDA */
131static const struct ieee80211_regdomain world_regdom = {
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800132 .n_reg_rules = 5,
Johannes Berg734366d2008-09-15 10:56:48 +0200133 .alpha2 = "00",
134 .reg_rules = {
Luis R. Rodriguez68798a62009-02-21 00:20:37 -0500135 /* IEEE 802.11b/g, channels 1..11 */
136 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800137 /* IEEE 802.11b/g, channels 12..13. No HT40
138 * channel fits here. */
139 REG_RULE(2467-10, 2472+10, 20, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500140 NL80211_RRF_PASSIVE_SCAN |
141 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800142 /* IEEE 802.11 channel 14 - Only JP enables
143 * this and for 802.11b only */
144 REG_RULE(2484-10, 2484+10, 20, 6, 20,
145 NL80211_RRF_PASSIVE_SCAN |
146 NL80211_RRF_NO_IBSS |
147 NL80211_RRF_NO_OFDM),
148 /* IEEE 802.11a, channel 36..48 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800149 REG_RULE(5180-10, 5240+10, 40, 6, 20,
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800150 NL80211_RRF_PASSIVE_SCAN |
151 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500152
153 /* NB: 5260 MHz - 5700 MHz requies DFS */
154
155 /* IEEE 802.11a, channel 149..165 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800156 REG_RULE(5745-10, 5825+10, 40, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500157 NL80211_RRF_PASSIVE_SCAN |
158 NL80211_RRF_NO_IBSS),
Johannes Berg734366d2008-09-15 10:56:48 +0200159 }
160};
161
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200162static const struct ieee80211_regdomain *cfg80211_world_regdom =
163 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200164
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400165static char *ieee80211_regdom = "00";
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500166static char user_alpha2[2];
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400167
Johannes Berg734366d2008-09-15 10:56:48 +0200168module_param(ieee80211_regdom, charp, 0444);
169MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
170
Luis R. Rodrigueza0429942011-11-28 16:47:15 -0500171static void reset_regdomains(bool full_reset)
Johannes Berg734366d2008-09-15 10:56:48 +0200172{
Johannes Berg942b25c2008-09-15 11:26:47 +0200173 /* avoid freeing static information or freeing something twice */
174 if (cfg80211_regdomain == cfg80211_world_regdom)
175 cfg80211_regdomain = NULL;
176 if (cfg80211_world_regdom == &world_regdom)
177 cfg80211_world_regdom = NULL;
178 if (cfg80211_regdomain == &world_regdom)
179 cfg80211_regdomain = NULL;
Johannes Berg942b25c2008-09-15 11:26:47 +0200180
181 kfree(cfg80211_regdomain);
182 kfree(cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200183
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200184 cfg80211_world_regdom = &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200185 cfg80211_regdomain = NULL;
Luis R. Rodrigueza0429942011-11-28 16:47:15 -0500186
187 if (!full_reset)
188 return;
189
190 if (last_request != &core_request_world)
191 kfree(last_request);
192 last_request = &core_request_world;
Johannes Berg734366d2008-09-15 10:56:48 +0200193}
194
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500195/*
196 * Dynamic world regulatory domain requested by the wireless
197 * core upon initialization
198 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200199static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200200{
Johannes Bergf6037d02008-10-21 11:01:33 +0200201 BUG_ON(!last_request);
Johannes Berg734366d2008-09-15 10:56:48 +0200202
Luis R. Rodrigueza0429942011-11-28 16:47:15 -0500203 reset_regdomains(false);
Johannes Berg734366d2008-09-15 10:56:48 +0200204
205 cfg80211_world_regdom = rd;
206 cfg80211_regdomain = rd;
207}
Johannes Berg734366d2008-09-15 10:56:48 +0200208
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200209bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100210{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700211 if (!alpha2)
212 return false;
213 if (alpha2[0] == '0' && alpha2[1] == '0')
214 return true;
215 return false;
Johannes Berg8318d782008-01-24 19:38:38 +0100216}
217
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200218static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700219{
220 if (!alpha2)
221 return false;
222 if (alpha2[0] != 0 && alpha2[1] != 0)
223 return true;
224 return false;
225}
Johannes Berg8318d782008-01-24 19:38:38 +0100226
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200227static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700228{
229 if (!alpha2)
230 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500231 /*
232 * Special case where regulatory domain was built by driver
233 * but a specific alpha2 cannot be determined
234 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700235 if (alpha2[0] == '9' && alpha2[1] == '9')
236 return true;
237 return false;
238}
239
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800240static bool is_intersected_alpha2(const char *alpha2)
241{
242 if (!alpha2)
243 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500244 /*
245 * Special case where regulatory domain is the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800246 * result of an intersection between two regulatory domain
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500247 * structures
248 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800249 if (alpha2[0] == '9' && alpha2[1] == '8')
250 return true;
251 return false;
252}
253
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200254static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700255{
256 if (!alpha2)
257 return false;
John W. Linvillec61029c2010-08-05 14:26:24 -0400258 if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700259 return true;
260 return false;
261}
262
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200263static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700264{
265 if (!alpha2_x || !alpha2_y)
266 return false;
267 if (alpha2_x[0] == alpha2_y[0] &&
268 alpha2_x[1] == alpha2_y[1])
269 return true;
270 return false;
271}
272
Luis R. Rodriguez69b15722009-02-21 00:04:33 -0500273static bool regdom_changes(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700274{
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500275 assert_cfg80211_lock();
276
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700277 if (!cfg80211_regdomain)
278 return true;
279 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
280 return false;
281 return true;
282}
283
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500284/*
285 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
286 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
287 * has ever been issued.
288 */
289static bool is_user_regdom_saved(void)
290{
291 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
292 return false;
293
294 /* This would indicate a mistake on the design */
295 if (WARN((!is_world_regdom(user_alpha2) &&
296 !is_an_alpha2(user_alpha2)),
297 "Unexpected user alpha2: %c%c\n",
298 user_alpha2[0],
299 user_alpha2[1]))
300 return false;
301
302 return true;
303}
304
John W. Linville3b377ea2009-12-18 17:59:01 -0500305static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
306 const struct ieee80211_regdomain *src_regd)
307{
308 struct ieee80211_regdomain *regd;
309 int size_of_regd = 0;
310 unsigned int i;
311
312 size_of_regd = sizeof(struct ieee80211_regdomain) +
313 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
314
315 regd = kzalloc(size_of_regd, GFP_KERNEL);
316 if (!regd)
317 return -ENOMEM;
318
319 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
320
321 for (i = 0; i < src_regd->n_reg_rules; i++)
322 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
323 sizeof(struct ieee80211_reg_rule));
324
325 *dst_regd = regd;
326 return 0;
327}
328
329#ifdef CONFIG_CFG80211_INTERNAL_REGDB
330struct reg_regdb_search_request {
331 char alpha2[2];
332 struct list_head list;
333};
334
335static LIST_HEAD(reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400336static DEFINE_MUTEX(reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500337
338static void reg_regdb_search(struct work_struct *work)
339{
340 struct reg_regdb_search_request *request;
341 const struct ieee80211_regdomain *curdom, *regdom;
342 int i, r;
343
John W. Linville368d06f2010-03-16 15:40:59 -0400344 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500345 while (!list_empty(&reg_regdb_search_list)) {
346 request = list_first_entry(&reg_regdb_search_list,
347 struct reg_regdb_search_request,
348 list);
349 list_del(&request->list);
350
351 for (i=0; i<reg_regdb_size; i++) {
352 curdom = reg_regdb[i];
353
354 if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
355 r = reg_copy_regd(&regdom, curdom);
356 if (r)
357 break;
John W. Linville3b377ea2009-12-18 17:59:01 -0500358 mutex_lock(&cfg80211_mutex);
359 set_regdom(regdom);
360 mutex_unlock(&cfg80211_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500361 break;
362 }
363 }
364
365 kfree(request);
366 }
John W. Linville368d06f2010-03-16 15:40:59 -0400367 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500368}
369
370static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
371
372static void reg_regdb_query(const char *alpha2)
373{
374 struct reg_regdb_search_request *request;
375
376 if (!alpha2)
377 return;
378
379 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
380 if (!request)
381 return;
382
383 memcpy(request->alpha2, alpha2, 2);
384
John W. Linville368d06f2010-03-16 15:40:59 -0400385 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500386 list_add_tail(&request->list, &reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400387 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500388
389 schedule_work(&reg_regdb_work);
390}
391#else
392static inline void reg_regdb_query(const char *alpha2) {}
393#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
394
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500395/*
396 * This lets us keep regulatory code which is updated on a regulatory
Scott James Remnant4d9d88d2011-03-08 10:45:30 -0800397 * basis in userspace. Country information is filled in by
398 * reg_device_uevent
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500399 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700400static int call_crda(const char *alpha2)
401{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700402 if (!is_world_regdom((char *) alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -0800403 pr_info("Calling CRDA for country: %c%c\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700404 alpha2[0], alpha2[1]);
405 else
Joe Perchese9c02682010-11-16 19:56:49 -0800406 pr_info("Calling CRDA to update world regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700407
John W. Linville3b377ea2009-12-18 17:59:01 -0500408 /* query internal regulatory database (if it exists) */
409 reg_regdb_query(alpha2);
410
Scott James Remnant4d9d88d2011-03-08 10:45:30 -0800411 return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700412}
413
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700414/* Used by nl80211 before kmalloc'ing our regulatory domain */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200415bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700416{
Luis R. Rodriguez61405e92009-05-13 17:04:41 -0400417 assert_cfg80211_lock();
418
Johannes Bergf6037d02008-10-21 11:01:33 +0200419 if (!last_request)
420 return false;
421
422 return alpha2_equal(last_request->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700423}
424
425/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200426static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700427{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200428 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700429 u32 freq_diff;
430
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800431 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700432 return false;
433
434 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
435 return false;
436
437 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
438
Roel Kluinbd05f282009-03-03 22:55:21 +0100439 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
440 freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700441 return false;
442
443 return true;
444}
445
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200446static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700447{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200448 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700449 unsigned int i;
450
451 if (!rd->n_reg_rules)
452 return false;
453
Luis R. Rodriguez88dc1c32008-11-12 14:22:01 -0800454 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
455 return false;
456
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700457 for (i = 0; i < rd->n_reg_rules; i++) {
458 reg_rule = &rd->reg_rules[i];
459 if (!is_valid_reg_rule(reg_rule))
460 return false;
461 }
462
463 return true;
464}
465
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400466static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
467 u32 center_freq_khz,
468 u32 bw_khz)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700469{
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400470 u32 start_freq_khz, end_freq_khz;
471
472 start_freq_khz = center_freq_khz - (bw_khz/2);
473 end_freq_khz = center_freq_khz + (bw_khz/2);
474
475 if (start_freq_khz >= freq_range->start_freq_khz &&
476 end_freq_khz <= freq_range->end_freq_khz)
477 return true;
478
479 return false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700480}
481
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800482/**
483 * freq_in_rule_band - tells us if a frequency is in a frequency band
484 * @freq_range: frequency rule we want to query
485 * @freq_khz: frequency we are inquiring about
486 *
487 * This lets us know if a specific frequency rule is or is not relevant to
488 * a specific frequency's band. Bands are device specific and artificial
489 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
490 * safe for now to assume that a frequency rule should not be part of a
491 * frequency's band if the start freq or end freq are off by more than 2 GHz.
492 * This resolution can be lowered and should be considered as we add
493 * regulatory rule support for other "bands".
494 **/
495static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
496 u32 freq_khz)
497{
498#define ONE_GHZ_IN_KHZ 1000000
499 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
500 return true;
501 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
502 return true;
503 return false;
504#undef ONE_GHZ_IN_KHZ
505}
506
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500507/*
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500508 * Helper for regdom_intersect(), this does the real
509 * mathematical intersection fun
510 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700511static int reg_rules_intersect(
512 const struct ieee80211_reg_rule *rule1,
513 const struct ieee80211_reg_rule *rule2,
514 struct ieee80211_reg_rule *intersected_rule)
515{
516 const struct ieee80211_freq_range *freq_range1, *freq_range2;
517 struct ieee80211_freq_range *freq_range;
518 const struct ieee80211_power_rule *power_rule1, *power_rule2;
519 struct ieee80211_power_rule *power_rule;
520 u32 freq_diff;
521
522 freq_range1 = &rule1->freq_range;
523 freq_range2 = &rule2->freq_range;
524 freq_range = &intersected_rule->freq_range;
525
526 power_rule1 = &rule1->power_rule;
527 power_rule2 = &rule2->power_rule;
528 power_rule = &intersected_rule->power_rule;
529
530 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
531 freq_range2->start_freq_khz);
532 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
533 freq_range2->end_freq_khz);
534 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
535 freq_range2->max_bandwidth_khz);
536
537 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
538 if (freq_range->max_bandwidth_khz > freq_diff)
539 freq_range->max_bandwidth_khz = freq_diff;
540
541 power_rule->max_eirp = min(power_rule1->max_eirp,
542 power_rule2->max_eirp);
543 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
544 power_rule2->max_antenna_gain);
545
546 intersected_rule->flags = (rule1->flags | rule2->flags);
547
548 if (!is_valid_reg_rule(intersected_rule))
549 return -EINVAL;
550
551 return 0;
552}
553
554/**
555 * regdom_intersect - do the intersection between two regulatory domains
556 * @rd1: first regulatory domain
557 * @rd2: second regulatory domain
558 *
559 * Use this function to get the intersection between two regulatory domains.
560 * Once completed we will mark the alpha2 for the rd as intersected, "98",
561 * as no one single alpha2 can represent this regulatory domain.
562 *
563 * Returns a pointer to the regulatory domain structure which will hold the
564 * resulting intersection of rules between rd1 and rd2. We will
565 * kzalloc() this structure for you.
566 */
567static struct ieee80211_regdomain *regdom_intersect(
568 const struct ieee80211_regdomain *rd1,
569 const struct ieee80211_regdomain *rd2)
570{
571 int r, size_of_regd;
572 unsigned int x, y;
573 unsigned int num_rules = 0, rule_idx = 0;
574 const struct ieee80211_reg_rule *rule1, *rule2;
575 struct ieee80211_reg_rule *intersected_rule;
576 struct ieee80211_regdomain *rd;
577 /* This is just a dummy holder to help us count */
578 struct ieee80211_reg_rule irule;
579
580 /* Uses the stack temporarily for counter arithmetic */
581 intersected_rule = &irule;
582
583 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
584
585 if (!rd1 || !rd2)
586 return NULL;
587
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500588 /*
589 * First we get a count of the rules we'll need, then we actually
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700590 * build them. This is to so we can malloc() and free() a
591 * regdomain once. The reason we use reg_rules_intersect() here
592 * is it will return -EINVAL if the rule computed makes no sense.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500593 * All rules that do check out OK are valid.
594 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700595
596 for (x = 0; x < rd1->n_reg_rules; x++) {
597 rule1 = &rd1->reg_rules[x];
598 for (y = 0; y < rd2->n_reg_rules; y++) {
599 rule2 = &rd2->reg_rules[y];
600 if (!reg_rules_intersect(rule1, rule2,
601 intersected_rule))
602 num_rules++;
603 memset(intersected_rule, 0,
604 sizeof(struct ieee80211_reg_rule));
605 }
606 }
607
608 if (!num_rules)
609 return NULL;
610
611 size_of_regd = sizeof(struct ieee80211_regdomain) +
612 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
613
614 rd = kzalloc(size_of_regd, GFP_KERNEL);
615 if (!rd)
616 return NULL;
617
618 for (x = 0; x < rd1->n_reg_rules; x++) {
619 rule1 = &rd1->reg_rules[x];
620 for (y = 0; y < rd2->n_reg_rules; y++) {
621 rule2 = &rd2->reg_rules[y];
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500622 /*
623 * This time around instead of using the stack lets
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700624 * write to the target rule directly saving ourselves
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500625 * a memcpy()
626 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700627 intersected_rule = &rd->reg_rules[rule_idx];
628 r = reg_rules_intersect(rule1, rule2,
629 intersected_rule);
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500630 /*
631 * No need to memset here the intersected rule here as
632 * we're not using the stack anymore
633 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700634 if (r)
635 continue;
636 rule_idx++;
637 }
638 }
639
640 if (rule_idx != num_rules) {
641 kfree(rd);
642 return NULL;
643 }
644
645 rd->n_reg_rules = num_rules;
646 rd->alpha2[0] = '9';
647 rd->alpha2[1] = '8';
648
649 return rd;
650}
651
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500652/*
653 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
654 * want to just have the channel structure use these
655 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700656static u32 map_regdom_flags(u32 rd_flags)
657{
658 u32 channel_flags = 0;
659 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
660 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
661 if (rd_flags & NL80211_RRF_NO_IBSS)
662 channel_flags |= IEEE80211_CHAN_NO_IBSS;
663 if (rd_flags & NL80211_RRF_DFS)
664 channel_flags |= IEEE80211_CHAN_RADAR;
665 return channel_flags;
666}
667
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800668static int freq_reg_info_regd(struct wiphy *wiphy,
669 u32 center_freq,
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400670 u32 desired_bw_khz,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800671 const struct ieee80211_reg_rule **reg_rule,
672 const struct ieee80211_regdomain *custom_regd)
Johannes Berg8318d782008-01-24 19:38:38 +0100673{
674 int i;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800675 bool band_rule_found = false;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800676 const struct ieee80211_regdomain *regd;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400677 bool bw_fits = false;
678
679 if (!desired_bw_khz)
680 desired_bw_khz = MHZ_TO_KHZ(20);
Johannes Berg8318d782008-01-24 19:38:38 +0100681
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800682 regd = custom_regd ? custom_regd : cfg80211_regdomain;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800683
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500684 /*
685 * Follow the driver's regulatory domain, if present, unless a country
686 * IE has been processed or a user wants to help complaince further
687 */
Luis R. Rodriguez2784fe92010-12-15 19:24:11 -0800688 if (!custom_regd &&
689 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400690 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800691 wiphy->regd)
692 regd = wiphy->regd;
693
694 if (!regd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700695 return -EINVAL;
696
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800697 for (i = 0; i < regd->n_reg_rules; i++) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700698 const struct ieee80211_reg_rule *rr;
699 const struct ieee80211_freq_range *fr = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700700
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800701 rr = &regd->reg_rules[i];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700702 fr = &rr->freq_range;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800703
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500704 /*
705 * We only need to know if one frequency rule was
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800706 * was in center_freq's band, that's enough, so lets
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500707 * not overwrite it once found
708 */
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800709 if (!band_rule_found)
710 band_rule_found = freq_in_rule_band(fr, center_freq);
711
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400712 bw_fits = reg_does_bw_fit(fr,
713 center_freq,
714 desired_bw_khz);
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800715
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400716 if (band_rule_found && bw_fits) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700717 *reg_rule = rr;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400718 return 0;
Johannes Berg8318d782008-01-24 19:38:38 +0100719 }
720 }
721
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800722 if (!band_rule_found)
723 return -ERANGE;
724
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400725 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700726}
727
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400728int freq_reg_info(struct wiphy *wiphy,
729 u32 center_freq,
730 u32 desired_bw_khz,
731 const struct ieee80211_reg_rule **reg_rule)
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800732{
Luis R. Rodriguezac46d482009-05-01 18:44:50 -0400733 assert_cfg80211_lock();
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400734 return freq_reg_info_regd(wiphy,
735 center_freq,
736 desired_bw_khz,
737 reg_rule,
738 NULL);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800739}
John W. Linville4f366c52010-07-15 14:57:33 -0400740EXPORT_SYMBOL(freq_reg_info);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700741
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530742#ifdef CONFIG_CFG80211_REG_DEBUG
743static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
744{
745 switch (initiator) {
746 case NL80211_REGDOM_SET_BY_CORE:
747 return "Set by core";
748 case NL80211_REGDOM_SET_BY_USER:
749 return "Set by user";
750 case NL80211_REGDOM_SET_BY_DRIVER:
751 return "Set by driver";
752 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
753 return "Set by country IE";
754 default:
755 WARN_ON(1);
756 return "Set by bug";
757 }
758}
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530759
760static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
761 u32 desired_bw_khz,
762 const struct ieee80211_reg_rule *reg_rule)
763{
764 const struct ieee80211_power_rule *power_rule;
765 const struct ieee80211_freq_range *freq_range;
766 char max_antenna_gain[32];
767
768 power_rule = &reg_rule->power_rule;
769 freq_range = &reg_rule->freq_range;
770
771 if (!power_rule->max_antenna_gain)
772 snprintf(max_antenna_gain, 32, "N/A");
773 else
774 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
775
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700776 REG_DBG_PRINT("Updating information on frequency %d MHz "
Bob Copelandff039c62010-12-29 17:09:02 -0500777 "for a %d MHz width channel with regulatory rule:\n",
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530778 chan->center_freq,
779 KHZ_TO_MHZ(desired_bw_khz));
780
Pavel Roskin56e67862011-09-01 11:54:12 -0400781 REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530782 freq_range->start_freq_khz,
783 freq_range->end_freq_khz,
Pavel Roskin56e67862011-09-01 11:54:12 -0400784 freq_range->max_bandwidth_khz,
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530785 max_antenna_gain,
786 power_rule->max_eirp);
787}
788#else
789static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
790 u32 desired_bw_khz,
791 const struct ieee80211_reg_rule *reg_rule)
792{
793 return;
794}
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530795#endif
796
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400797/*
798 * Note that right now we assume the desired channel bandwidth
799 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
800 * per channel, the primary and the extension channel). To support
801 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
802 * new ieee80211_channel.target_bw and re run the regulatory check
803 * on the wiphy with the target_bw specified. Then we can simply use
804 * that below for the desired_bw_khz below.
805 */
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700806static void handle_channel(struct wiphy *wiphy,
807 enum nl80211_reg_initiator initiator,
808 enum ieee80211_band band,
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800809 unsigned int chan_idx)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700810{
811 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400812 u32 flags, bw_flags = 0;
813 u32 desired_bw_khz = MHZ_TO_KHZ(20);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700814 const struct ieee80211_reg_rule *reg_rule = NULL;
815 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400816 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800817 struct ieee80211_supported_band *sband;
818 struct ieee80211_channel *chan;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500819 struct wiphy *request_wiphy = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800820
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500821 assert_cfg80211_lock();
822
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500823 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
824
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800825 sband = wiphy->bands[band];
826 BUG_ON(chan_idx >= sband->n_channels);
827 chan = &sband->channels[chan_idx];
828
829 flags = chan->orig_flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700830
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400831 r = freq_reg_info(wiphy,
832 MHZ_TO_KHZ(chan->center_freq),
833 desired_bw_khz,
834 &reg_rule);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700835
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700836 if (r) {
837 /*
838 * We will disable all channels that do not match our
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300839 * received regulatory rule unless the hint is coming
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700840 * from a Country IE and the Country IE had no information
841 * about a band. The IEEE 802.11 spec allows for an AP
842 * to send only a subset of the regulatory rules allowed,
843 * so an AP in the US that only supports 2.4 GHz may only send
844 * a country IE with information for the 2.4 GHz band
845 * while 5 GHz is still supported.
846 */
847 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
848 r == -ERANGE)
849 return;
850
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700851 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700852 chan->flags = IEEE80211_CHAN_DISABLED;
Johannes Berg8318d782008-01-24 19:38:38 +0100853 return;
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700854 }
Johannes Berg8318d782008-01-24 19:38:38 +0100855
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530856 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
857
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700858 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400859 freq_range = &reg_rule->freq_range;
860
861 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
862 bw_flags = IEEE80211_CHAN_NO_HT40;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700863
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400864 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500865 request_wiphy && request_wiphy == wiphy &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100866 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500867 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300868 * This guarantees the driver's requested regulatory domain
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800869 * will always be used as a base for further regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500870 * settings
871 */
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800872 chan->flags = chan->orig_flags =
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400873 map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800874 chan->max_antenna_gain = chan->orig_mag =
875 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800876 chan->max_power = chan->orig_mpwr =
877 (int) MBM_TO_DBM(power_rule->max_eirp);
878 return;
879 }
880
Rajkumar Manoharanaa3d7ee2011-09-14 14:28:17 +0530881 chan->beacon_found = false;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400882 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
Johannes Berg8318d782008-01-24 19:38:38 +0100883 chan->max_antenna_gain = min(chan->orig_mag,
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700884 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
Hong Wueccc0682012-01-11 20:33:39 +0200885 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
886 chan->max_power = min(chan->max_power, chan->max_reg_power);
Johannes Berg8318d782008-01-24 19:38:38 +0100887}
888
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700889static void handle_band(struct wiphy *wiphy,
890 enum ieee80211_band band,
891 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +0100892{
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800893 unsigned int i;
894 struct ieee80211_supported_band *sband;
895
896 BUG_ON(!wiphy->bands[band]);
897 sband = wiphy->bands[band];
Johannes Berg8318d782008-01-24 19:38:38 +0100898
899 for (i = 0; i < sband->n_channels; i++)
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700900 handle_channel(wiphy, initiator, band, i);
Johannes Berg8318d782008-01-24 19:38:38 +0100901}
902
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400903static bool ignore_reg_update(struct wiphy *wiphy,
904 enum nl80211_reg_initiator initiator)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800905{
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530906 if (!last_request) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700907 REG_DBG_PRINT("Ignoring regulatory request %s since "
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530908 "last_request is not set\n",
909 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800910 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530911 }
912
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400913 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530914 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700915 REG_DBG_PRINT("Ignoring regulatory request %s "
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530916 "since the driver uses its own custom "
Joe Perches12c5ffb2011-07-29 14:51:25 -0700917 "regulatory domain\n",
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530918 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800919 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530920 }
921
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500922 /*
923 * wiphy->regd will be set once the device has its own
924 * desired regulatory domain set
925 */
Johannes Berg5be83de2009-11-19 00:56:28 +0100926 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
Luis R. Rodriguez749b5272010-10-20 10:18:54 -0700927 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530928 !is_world_regdom(last_request->alpha2)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700929 REG_DBG_PRINT("Ignoring regulatory request %s "
Mihai Moldovan5bc91db2011-07-25 11:18:58 +0200930 "since the driver requires its own regulatory "
Joe Perches12c5ffb2011-07-29 14:51:25 -0700931 "domain to be set first\n",
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530932 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800933 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530934 }
935
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800936 return false;
937}
938
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500939static void handle_reg_beacon(struct wiphy *wiphy,
940 unsigned int chan_idx,
941 struct reg_beacon *reg_beacon)
942{
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500943 struct ieee80211_supported_band *sband;
944 struct ieee80211_channel *chan;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400945 bool channel_changed = false;
946 struct ieee80211_channel chan_before;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500947
948 assert_cfg80211_lock();
949
950 sband = wiphy->bands[reg_beacon->chan.band];
951 chan = &sband->channels[chan_idx];
952
953 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
954 return;
955
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400956 if (chan->beacon_found)
957 return;
958
959 chan->beacon_found = true;
960
Johannes Berg5be83de2009-11-19 00:56:28 +0100961 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700962 return;
963
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400964 chan_before.center_freq = chan->center_freq;
965 chan_before.flags = chan->flags;
966
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700967 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500968 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400969 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500970 }
971
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700972 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500973 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400974 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500975 }
976
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400977 if (channel_changed)
978 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500979}
980
981/*
982 * Called when a scan on a wiphy finds a beacon on
983 * new channel
984 */
985static void wiphy_update_new_beacon(struct wiphy *wiphy,
986 struct reg_beacon *reg_beacon)
987{
988 unsigned int i;
989 struct ieee80211_supported_band *sband;
990
991 assert_cfg80211_lock();
992
993 if (!wiphy->bands[reg_beacon->chan.band])
994 return;
995
996 sband = wiphy->bands[reg_beacon->chan.band];
997
998 for (i = 0; i < sband->n_channels; i++)
999 handle_reg_beacon(wiphy, i, reg_beacon);
1000}
1001
1002/*
1003 * Called upon reg changes or a new wiphy is added
1004 */
1005static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1006{
1007 unsigned int i;
1008 struct ieee80211_supported_band *sband;
1009 struct reg_beacon *reg_beacon;
1010
1011 assert_cfg80211_lock();
1012
1013 if (list_empty(&reg_beacon_list))
1014 return;
1015
1016 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1017 if (!wiphy->bands[reg_beacon->chan.band])
1018 continue;
1019 sband = wiphy->bands[reg_beacon->chan.band];
1020 for (i = 0; i < sband->n_channels; i++)
1021 handle_reg_beacon(wiphy, i, reg_beacon);
1022 }
1023}
1024
1025static bool reg_is_world_roaming(struct wiphy *wiphy)
1026{
1027 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1028 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1029 return true;
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -04001030 if (last_request &&
1031 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Johannes Berg5be83de2009-11-19 00:56:28 +01001032 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001033 return true;
1034 return false;
1035}
1036
1037/* Reap the advantages of previously found beacons */
1038static void reg_process_beacons(struct wiphy *wiphy)
1039{
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -04001040 /*
1041 * Means we are just firing up cfg80211, so no beacons would
1042 * have been processed yet.
1043 */
1044 if (!last_request)
1045 return;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001046 if (!reg_is_world_roaming(wiphy))
1047 return;
1048 wiphy_update_beacon_reg(wiphy);
1049}
1050
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001051static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1052{
1053 if (!chan)
1054 return true;
1055 if (chan->flags & IEEE80211_CHAN_DISABLED)
1056 return true;
1057 /* This would happen when regulatory rules disallow HT40 completely */
1058 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1059 return true;
1060 return false;
1061}
1062
1063static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1064 enum ieee80211_band band,
1065 unsigned int chan_idx)
1066{
1067 struct ieee80211_supported_band *sband;
1068 struct ieee80211_channel *channel;
1069 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1070 unsigned int i;
1071
1072 assert_cfg80211_lock();
1073
1074 sband = wiphy->bands[band];
1075 BUG_ON(chan_idx >= sband->n_channels);
1076 channel = &sband->channels[chan_idx];
1077
1078 if (is_ht40_not_allowed(channel)) {
1079 channel->flags |= IEEE80211_CHAN_NO_HT40;
1080 return;
1081 }
1082
1083 /*
1084 * We need to ensure the extension channels exist to
1085 * be able to use HT40- or HT40+, this finds them (or not)
1086 */
1087 for (i = 0; i < sband->n_channels; i++) {
1088 struct ieee80211_channel *c = &sband->channels[i];
1089 if (c->center_freq == (channel->center_freq - 20))
1090 channel_before = c;
1091 if (c->center_freq == (channel->center_freq + 20))
1092 channel_after = c;
1093 }
1094
1095 /*
1096 * Please note that this assumes target bandwidth is 20 MHz,
1097 * if that ever changes we also need to change the below logic
1098 * to include that as well.
1099 */
1100 if (is_ht40_not_allowed(channel_before))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001101 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001102 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001103 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001104
1105 if (is_ht40_not_allowed(channel_after))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001106 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001107 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001108 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001109}
1110
1111static void reg_process_ht_flags_band(struct wiphy *wiphy,
1112 enum ieee80211_band band)
1113{
1114 unsigned int i;
1115 struct ieee80211_supported_band *sband;
1116
1117 BUG_ON(!wiphy->bands[band]);
1118 sband = wiphy->bands[band];
1119
1120 for (i = 0; i < sband->n_channels; i++)
1121 reg_process_ht_flags_channel(wiphy, band, i);
1122}
1123
1124static void reg_process_ht_flags(struct wiphy *wiphy)
1125{
1126 enum ieee80211_band band;
1127
1128 if (!wiphy)
1129 return;
1130
1131 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1132 if (wiphy->bands[band])
1133 reg_process_ht_flags_band(wiphy, band);
1134 }
1135
1136}
1137
Sven Neumanneac03e32011-08-30 23:38:53 +02001138static void wiphy_update_regulatory(struct wiphy *wiphy,
1139 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +01001140{
1141 enum ieee80211_band band;
Luis R. Rodriguezd46e5b12009-01-22 15:05:50 -08001142
Sven Neumanneac03e32011-08-30 23:38:53 +02001143 assert_reg_lock();
1144
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001145 if (ignore_reg_update(wiphy, initiator))
Sven Neumanna203c2a2011-07-12 15:52:07 +02001146 return;
1147
Luis R. Rodriguezb68e6b32011-10-11 10:59:03 -07001148 last_request->dfs_region = cfg80211_regdomain->dfs_region;
1149
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001150 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Johannes Berg8318d782008-01-24 19:38:38 +01001151 if (wiphy->bands[band])
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -07001152 handle_band(wiphy, band, initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001153 }
Sven Neumanna203c2a2011-07-12 15:52:07 +02001154
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001155 reg_process_beacons(wiphy);
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001156 reg_process_ht_flags(wiphy);
Luis R. Rodriguez560e28e2009-01-07 17:43:32 -08001157 if (wiphy->reg_notifier)
Luis R. Rodriguez716f9392009-01-22 15:05:51 -08001158 wiphy->reg_notifier(wiphy, last_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001159}
1160
Sven Neumanneac03e32011-08-30 23:38:53 +02001161void regulatory_update(struct wiphy *wiphy,
1162 enum nl80211_reg_initiator setby)
1163{
1164 mutex_lock(&reg_mutex);
1165 wiphy_update_regulatory(wiphy, setby);
1166 mutex_unlock(&reg_mutex);
1167}
1168
Sven Neumannd7549cb2011-08-30 23:38:54 +02001169static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1170{
1171 struct cfg80211_registered_device *rdev;
Rajkumar Manoharan4a389942011-12-08 23:59:26 +05301172 struct wiphy *wiphy;
Sven Neumannd7549cb2011-08-30 23:38:54 +02001173
Rajkumar Manoharan4a389942011-12-08 23:59:26 +05301174 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1175 wiphy = &rdev->wiphy;
1176 wiphy_update_regulatory(wiphy, initiator);
1177 /*
1178 * Regulatory updates set by CORE are ignored for custom
1179 * regulatory cards. Let us notify the changes to the driver,
1180 * as some drivers used this to restore its orig_* reg domain.
1181 */
1182 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1183 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
1184 wiphy->reg_notifier)
1185 wiphy->reg_notifier(wiphy, last_request);
1186 }
Sven Neumannd7549cb2011-08-30 23:38:54 +02001187}
1188
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001189static void handle_channel_custom(struct wiphy *wiphy,
1190 enum ieee80211_band band,
1191 unsigned int chan_idx,
1192 const struct ieee80211_regdomain *regd)
1193{
1194 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001195 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1196 u32 bw_flags = 0;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001197 const struct ieee80211_reg_rule *reg_rule = NULL;
1198 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001199 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001200 struct ieee80211_supported_band *sband;
1201 struct ieee80211_channel *chan;
1202
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001203 assert_reg_lock();
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001204
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001205 sband = wiphy->bands[band];
1206 BUG_ON(chan_idx >= sband->n_channels);
1207 chan = &sband->channels[chan_idx];
1208
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001209 r = freq_reg_info_regd(wiphy,
1210 MHZ_TO_KHZ(chan->center_freq),
1211 desired_bw_khz,
1212 &reg_rule,
1213 regd);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001214
1215 if (r) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001216 REG_DBG_PRINT("Disabling freq %d MHz as custom "
Luis R. Rodrigueza6518532010-10-20 10:18:57 -07001217 "regd has no rule that fits a %d MHz "
1218 "wide channel\n",
1219 chan->center_freq,
1220 KHZ_TO_MHZ(desired_bw_khz));
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001221 chan->flags = IEEE80211_CHAN_DISABLED;
1222 return;
1223 }
1224
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +05301225 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1226
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001227 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001228 freq_range = &reg_rule->freq_range;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001229
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001230 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1231 bw_flags = IEEE80211_CHAN_NO_HT40;
1232
1233 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001234 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001235 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1236}
1237
1238static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1239 const struct ieee80211_regdomain *regd)
1240{
1241 unsigned int i;
1242 struct ieee80211_supported_band *sband;
1243
1244 BUG_ON(!wiphy->bands[band]);
1245 sband = wiphy->bands[band];
1246
1247 for (i = 0; i < sband->n_channels; i++)
1248 handle_channel_custom(wiphy, band, i, regd);
1249}
1250
1251/* Used by drivers prior to wiphy registration */
1252void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1253 const struct ieee80211_regdomain *regd)
1254{
1255 enum ieee80211_band band;
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001256 unsigned int bands_set = 0;
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001257
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001258 mutex_lock(&reg_mutex);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001259 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001260 if (!wiphy->bands[band])
1261 continue;
1262 handle_band_custom(wiphy, band, regd);
1263 bands_set++;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001264 }
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001265 mutex_unlock(&reg_mutex);
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001266
1267 /*
1268 * no point in calling this if it won't have any effect
1269 * on your device's supportd bands.
1270 */
1271 WARN_ON(!bands_set);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001272}
1273EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1274
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001275/*
1276 * Return value which can be used by ignore_request() to indicate
1277 * it has been determined we should intersect two regulatory domains
1278 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001279#define REG_INTERSECT 1
1280
Johannes Berg84fa4f42008-10-24 20:32:23 +02001281/* This has the logic which determines when a new request
1282 * should be ignored. */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001283static int ignore_request(struct wiphy *wiphy,
1284 struct regulatory_request *pending_request)
Johannes Berg84fa4f42008-10-24 20:32:23 +02001285{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001286 struct wiphy *last_wiphy = NULL;
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001287
1288 assert_cfg80211_lock();
1289
Johannes Berg84fa4f42008-10-24 20:32:23 +02001290 /* All initial requests are respected */
1291 if (!last_request)
1292 return 0;
1293
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001294 switch (pending_request->initiator) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001295 case NL80211_REGDOM_SET_BY_CORE:
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001296 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001297 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001298
1299 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1300
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001301 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001302 return -EINVAL;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001303 if (last_request->initiator ==
1304 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001305 if (last_wiphy != wiphy) {
Johannes Berg84fa4f42008-10-24 20:32:23 +02001306 /*
1307 * Two cards with two APs claiming different
Thadeu Lima de Souza Cascardo1fe90b02009-08-11 11:18:42 -03001308 * Country IE alpha2s. We could
Johannes Berg84fa4f42008-10-24 20:32:23 +02001309 * intersect them, but that seems unlikely
1310 * to be correct. Reject second one for now.
1311 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001312 if (regdom_changes(pending_request->alpha2))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001313 return -EOPNOTSUPP;
1314 return -EALREADY;
1315 }
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001316 /*
1317 * Two consecutive Country IE hints on the same wiphy.
1318 * This should be picked up early by the driver/stack
1319 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001320 if (WARN_ON(regdom_changes(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001321 return 0;
1322 return -EALREADY;
1323 }
Luis R. Rodrigueza171fba2010-10-18 17:44:51 -07001324 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001325 case NL80211_REGDOM_SET_BY_DRIVER:
1326 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001327 if (regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001328 return 0;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001329 return -EALREADY;
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001330 }
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001331
1332 /*
1333 * This would happen if you unplug and plug your card
1334 * back in or if you add a new device for which the previously
1335 * loaded card also agrees on the regulatory domain.
1336 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001337 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001338 !regdom_changes(pending_request->alpha2))
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001339 return -EALREADY;
1340
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001341 return REG_INTERSECT;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001342 case NL80211_REGDOM_SET_BY_USER:
1343 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001344 return REG_INTERSECT;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001345 /*
1346 * If the user knows better the user should set the regdom
1347 * to their country before the IE is picked up
1348 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001349 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001350 last_request->intersect)
1351 return -EOPNOTSUPP;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001352 /*
1353 * Process user requests only after previous user/driver/core
1354 * requests have been processed
1355 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001356 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1357 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1358 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
Luis R. Rodriguez69b15722009-02-21 00:04:33 -05001359 if (regdom_changes(last_request->alpha2))
Luis R. Rodriguez5eebade2009-01-22 15:05:47 -08001360 return -EAGAIN;
1361 }
1362
John W. Linvillebaeb66f2009-12-18 17:59:02 -05001363 if (!regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001364 return -EALREADY;
1365
Johannes Berg84fa4f42008-10-24 20:32:23 +02001366 return 0;
1367 }
1368
1369 return -EINVAL;
1370}
1371
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001372static void reg_set_request_processed(void)
1373{
1374 bool need_more_processing = false;
1375
1376 last_request->processed = true;
1377
1378 spin_lock(&reg_requests_lock);
1379 if (!list_empty(&reg_requests_list))
1380 need_more_processing = true;
1381 spin_unlock(&reg_requests_lock);
1382
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001383 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
1384 cancel_delayed_work_sync(&reg_timeout);
1385
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001386 if (need_more_processing)
1387 schedule_work(&reg_work);
1388}
1389
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001390/**
1391 * __regulatory_hint - hint to the wireless core a regulatory domain
1392 * @wiphy: if the hint comes from country information from an AP, this
1393 * is required to be set to the wiphy that received the information
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001394 * @pending_request: the regulatory request currently being processed
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001395 *
1396 * The Wireless subsystem can use this function to hint to the wireless core
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001397 * what it believes should be the current regulatory domain.
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001398 *
1399 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1400 * already been set or other standard error codes.
1401 *
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001402 * Caller must hold &cfg80211_mutex and &reg_mutex
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001403 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001404static int __regulatory_hint(struct wiphy *wiphy,
1405 struct regulatory_request *pending_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001406{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001407 bool intersect = false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001408 int r = 0;
1409
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001410 assert_cfg80211_lock();
1411
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001412 r = ignore_request(wiphy, pending_request);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001413
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001414 if (r == REG_INTERSECT) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001415 if (pending_request->initiator ==
1416 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001417 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001418 if (r) {
1419 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001420 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001421 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001422 }
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001423 intersect = true;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001424 } else if (r) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001425 /*
1426 * If the regulatory domain being requested by the
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001427 * driver has already been set just copy it to the
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001428 * wiphy
1429 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001430 if (r == -EALREADY &&
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001431 pending_request->initiator ==
1432 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001433 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001434 if (r) {
1435 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001436 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001437 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001438 r = -EALREADY;
1439 goto new_request;
1440 }
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001441 kfree(pending_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001442 return r;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001443 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001444
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001445new_request:
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05001446 if (last_request != &core_request_world)
1447 kfree(last_request);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001448
1449 last_request = pending_request;
1450 last_request->intersect = intersect;
1451
1452 pending_request = NULL;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001453
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001454 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1455 user_alpha2[0] = last_request->alpha2[0];
1456 user_alpha2[1] = last_request->alpha2[1];
1457 }
1458
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001459 /* When r == REG_INTERSECT we do need to call CRDA */
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001460 if (r < 0) {
1461 /*
1462 * Since CRDA will not be called in this case as we already
1463 * have applied the requested regulatory domain before we just
1464 * inform userspace we have processed the request
1465 */
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001466 if (r == -EALREADY) {
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001467 nl80211_send_reg_change_event(last_request);
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001468 reg_set_request_processed();
1469 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001470 return r;
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001471 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001472
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001473 return call_crda(last_request->alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001474}
1475
Luis R. Rodriguez30a548c2009-05-02 01:17:27 -04001476/* This processes *all* regulatory hints */
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001477static void reg_process_hint(struct regulatory_request *reg_request,
1478 enum nl80211_reg_initiator reg_initiator)
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001479{
1480 int r = 0;
1481 struct wiphy *wiphy = NULL;
1482
1483 BUG_ON(!reg_request->alpha2);
1484
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001485 if (wiphy_idx_valid(reg_request->wiphy_idx))
1486 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1487
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001488 if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001489 !wiphy) {
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001490 kfree(reg_request);
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001491 return;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001492 }
1493
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001494 r = __regulatory_hint(wiphy, reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001495 /* This is required so that the orig_* parameters are saved */
Johannes Berg5be83de2009-11-19 00:56:28 +01001496 if (r == -EALREADY && wiphy &&
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001497 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001498 wiphy_update_regulatory(wiphy, reg_initiator);
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001499 return;
1500 }
1501
1502 /*
1503 * We only time out user hints, given that they should be the only
1504 * source of bogus requests.
1505 */
Luis R. Rodriguezc989bb12011-04-25 18:35:48 -07001506 if (r != -EALREADY &&
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001507 reg_initiator == NL80211_REGDOM_SET_BY_USER)
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001508 schedule_delayed_work(&reg_timeout, msecs_to_jiffies(3142));
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001509}
1510
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001511/*
1512 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1513 * Regulatory hints come on a first come first serve basis and we
1514 * must process each one atomically.
1515 */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001516static void reg_process_pending_hints(void)
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001517{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001518 struct regulatory_request *reg_request;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001519
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001520 mutex_lock(&cfg80211_mutex);
1521 mutex_lock(&reg_mutex);
1522
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001523 /* When last_request->processed becomes true this will be rescheduled */
1524 if (last_request && !last_request->processed) {
1525 REG_DBG_PRINT("Pending regulatory request, waiting "
Joe Perches12c5ffb2011-07-29 14:51:25 -07001526 "for it to be processed...\n");
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001527 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001528 }
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001529
1530 spin_lock(&reg_requests_lock);
1531
1532 if (list_empty(&reg_requests_list)) {
1533 spin_unlock(&reg_requests_lock);
1534 goto out;
1535 }
1536
1537 reg_request = list_first_entry(&reg_requests_list,
1538 struct regulatory_request,
1539 list);
1540 list_del_init(&reg_request->list);
1541
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001542 spin_unlock(&reg_requests_lock);
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001543
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001544 reg_process_hint(reg_request, reg_request->initiator);
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001545
1546out:
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001547 mutex_unlock(&reg_mutex);
1548 mutex_unlock(&cfg80211_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001549}
1550
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001551/* Processes beacon hints -- this has nothing to do with country IEs */
1552static void reg_process_pending_beacon_hints(void)
1553{
Johannes Berg79c97e92009-07-07 03:56:12 +02001554 struct cfg80211_registered_device *rdev;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001555 struct reg_beacon *pending_beacon, *tmp;
1556
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001557 /*
1558 * No need to hold the reg_mutex here as we just touch wiphys
1559 * and do not read or access regulatory variables.
1560 */
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001561 mutex_lock(&cfg80211_mutex);
1562
1563 /* This goes through the _pending_ beacon list */
1564 spin_lock_bh(&reg_pending_beacons_lock);
1565
1566 if (list_empty(&reg_pending_beacons)) {
1567 spin_unlock_bh(&reg_pending_beacons_lock);
1568 goto out;
1569 }
1570
1571 list_for_each_entry_safe(pending_beacon, tmp,
1572 &reg_pending_beacons, list) {
1573
1574 list_del_init(&pending_beacon->list);
1575
1576 /* Applies the beacon hint to current wiphys */
Johannes Berg79c97e92009-07-07 03:56:12 +02001577 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1578 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001579
1580 /* Remembers the beacon hint for new wiphys or reg changes */
1581 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1582 }
1583
1584 spin_unlock_bh(&reg_pending_beacons_lock);
1585out:
1586 mutex_unlock(&cfg80211_mutex);
1587}
1588
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001589static void reg_todo(struct work_struct *work)
1590{
1591 reg_process_pending_hints();
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001592 reg_process_pending_beacon_hints();
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001593}
1594
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001595static void queue_regulatory_request(struct regulatory_request *request)
1596{
John W. Linvillec61029c2010-08-05 14:26:24 -04001597 if (isalpha(request->alpha2[0]))
1598 request->alpha2[0] = toupper(request->alpha2[0]);
1599 if (isalpha(request->alpha2[1]))
1600 request->alpha2[1] = toupper(request->alpha2[1]);
1601
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001602 spin_lock(&reg_requests_lock);
1603 list_add_tail(&request->list, &reg_requests_list);
1604 spin_unlock(&reg_requests_lock);
1605
1606 schedule_work(&reg_work);
1607}
1608
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001609/*
1610 * Core regulatory hint -- happens during cfg80211_init()
1611 * and when we restore regulatory settings.
1612 */
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001613static int regulatory_hint_core(const char *alpha2)
1614{
1615 struct regulatory_request *request;
1616
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001617 request = kzalloc(sizeof(struct regulatory_request),
1618 GFP_KERNEL);
1619 if (!request)
1620 return -ENOMEM;
1621
1622 request->alpha2[0] = alpha2[0];
1623 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001624 request->initiator = NL80211_REGDOM_SET_BY_CORE;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001625
Luis R. Rodriguez31e99722010-11-17 21:46:06 -08001626 queue_regulatory_request(request);
Luis R. Rodriguez5078b2e2009-05-13 17:04:42 -04001627
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001628 return 0;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001629}
1630
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001631/* User hints */
1632int regulatory_hint_user(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001633{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001634 struct regulatory_request *request;
1635
Johannes Bergbe3d4812008-10-24 20:32:21 +02001636 BUG_ON(!alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001637
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001638 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1639 if (!request)
1640 return -ENOMEM;
1641
1642 request->wiphy_idx = WIPHY_IDX_STALE;
1643 request->alpha2[0] = alpha2[0];
1644 request->alpha2[1] = alpha2[1];
Luis R. Rodrigueze12822e2010-01-04 11:37:39 -05001645 request->initiator = NL80211_REGDOM_SET_BY_USER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001646
1647 queue_regulatory_request(request);
1648
1649 return 0;
1650}
1651
1652/* Driver hints */
1653int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1654{
1655 struct regulatory_request *request;
1656
1657 BUG_ON(!alpha2);
1658 BUG_ON(!wiphy);
1659
1660 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1661 if (!request)
1662 return -ENOMEM;
1663
1664 request->wiphy_idx = get_wiphy_idx(wiphy);
1665
1666 /* Must have registered wiphy first */
1667 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1668
1669 request->alpha2[0] = alpha2[0];
1670 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001671 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001672
1673 queue_regulatory_request(request);
1674
1675 return 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001676}
1677EXPORT_SYMBOL(regulatory_hint);
1678
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001679/*
1680 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1681 * therefore cannot iterate over the rdev list here.
1682 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001683void regulatory_hint_11d(struct wiphy *wiphy,
Luis R. Rodriguez84920e32010-01-14 20:08:20 -05001684 enum ieee80211_band band,
1685 u8 *country_ie,
1686 u8 country_ie_len)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001687{
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001688 char alpha2[2];
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001689 enum environment_cap env = ENVIRON_ANY;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001690 struct regulatory_request *request;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001691
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001692 mutex_lock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001693
Luis R. Rodriguez9828b012009-07-30 17:38:06 -07001694 if (unlikely(!last_request))
1695 goto out;
Luis R. Rodriguezd335fe62009-02-21 00:04:27 -05001696
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001697 /* IE len must be evenly divisible by 2 */
1698 if (country_ie_len & 0x01)
1699 goto out;
1700
1701 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1702 goto out;
1703
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001704 alpha2[0] = country_ie[0];
1705 alpha2[1] = country_ie[1];
1706
1707 if (country_ie[2] == 'I')
1708 env = ENVIRON_INDOOR;
1709 else if (country_ie[2] == 'O')
1710 env = ENVIRON_OUTDOOR;
1711
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001712 /*
Luis R. Rodriguez8b19e6c2009-07-30 17:38:09 -07001713 * We will run this only upon a successful connection on cfg80211.
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001714 * We leave conflict resolution to the workqueue, where can hold
1715 * cfg80211_mutex.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001716 */
Luis R. Rodriguezcc0b6fe2009-03-20 23:53:05 -04001717 if (likely(last_request->initiator ==
1718 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001719 wiphy_idx_valid(last_request->wiphy_idx)))
1720 goto out;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001721
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001722 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1723 if (!request)
Dan Carpenterf9f9b6e2010-07-22 13:26:50 +02001724 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001725
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001726 request->wiphy_idx = get_wiphy_idx(wiphy);
John W. Linville4f366c52010-07-15 14:57:33 -04001727 request->alpha2[0] = alpha2[0];
1728 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001729 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001730 request->country_ie_env = env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001731
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001732 mutex_unlock(&reg_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001733
1734 queue_regulatory_request(request);
1735
1736 return;
Luis R. Rodriguez0441d6f2009-02-21 00:04:29 -05001737
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001738out:
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001739 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001740}
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001741
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001742static void restore_alpha2(char *alpha2, bool reset_user)
1743{
1744 /* indicates there is no alpha2 to consider for restoration */
1745 alpha2[0] = '9';
1746 alpha2[1] = '7';
1747
1748 /* The user setting has precedence over the module parameter */
1749 if (is_user_regdom_saved()) {
1750 /* Unless we're asked to ignore it and reset it */
1751 if (reset_user) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001752 REG_DBG_PRINT("Restoring regulatory settings "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001753 "including user preference\n");
1754 user_alpha2[0] = '9';
1755 user_alpha2[1] = '7';
1756
1757 /*
1758 * If we're ignoring user settings, we still need to
1759 * check the module parameter to ensure we put things
1760 * back as they were for a full restore.
1761 */
1762 if (!is_world_regdom(ieee80211_regdom)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001763 REG_DBG_PRINT("Keeping preference on "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001764 "module parameter ieee80211_regdom: %c%c\n",
1765 ieee80211_regdom[0],
1766 ieee80211_regdom[1]);
1767 alpha2[0] = ieee80211_regdom[0];
1768 alpha2[1] = ieee80211_regdom[1];
1769 }
1770 } else {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001771 REG_DBG_PRINT("Restoring regulatory settings "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001772 "while preserving user preference for: %c%c\n",
1773 user_alpha2[0],
1774 user_alpha2[1]);
1775 alpha2[0] = user_alpha2[0];
1776 alpha2[1] = user_alpha2[1];
1777 }
1778 } else if (!is_world_regdom(ieee80211_regdom)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001779 REG_DBG_PRINT("Keeping preference on "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001780 "module parameter ieee80211_regdom: %c%c\n",
1781 ieee80211_regdom[0],
1782 ieee80211_regdom[1]);
1783 alpha2[0] = ieee80211_regdom[0];
1784 alpha2[1] = ieee80211_regdom[1];
1785 } else
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001786 REG_DBG_PRINT("Restoring regulatory settings\n");
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001787}
1788
Rajkumar Manoharan5ce543d2011-12-07 21:50:08 +05301789static void restore_custom_reg_settings(struct wiphy *wiphy)
1790{
1791 struct ieee80211_supported_band *sband;
1792 enum ieee80211_band band;
1793 struct ieee80211_channel *chan;
1794 int i;
1795
1796 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1797 sband = wiphy->bands[band];
1798 if (!sband)
1799 continue;
1800 for (i = 0; i < sband->n_channels; i++) {
1801 chan = &sband->channels[i];
1802 chan->flags = chan->orig_flags;
1803 chan->max_antenna_gain = chan->orig_mag;
1804 chan->max_power = chan->orig_mpwr;
1805 }
1806 }
1807}
1808
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001809/*
1810 * Restoring regulatory settings involves ingoring any
1811 * possibly stale country IE information and user regulatory
1812 * settings if so desired, this includes any beacon hints
1813 * learned as we could have traveled outside to another country
1814 * after disconnection. To restore regulatory settings we do
1815 * exactly what we did at bootup:
1816 *
1817 * - send a core regulatory hint
1818 * - send a user regulatory hint if applicable
1819 *
1820 * Device drivers that send a regulatory hint for a specific country
1821 * keep their own regulatory domain on wiphy->regd so that does does
1822 * not need to be remembered.
1823 */
1824static void restore_regulatory_settings(bool reset_user)
1825{
1826 char alpha2[2];
Dmitry Shmidtcee0bec2011-12-19 12:32:21 -08001827 char world_alpha2[2];
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001828 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001829 struct regulatory_request *reg_request, *tmp;
1830 LIST_HEAD(tmp_reg_req_list);
Rajkumar Manoharan5ce543d2011-12-07 21:50:08 +05301831 struct cfg80211_registered_device *rdev;
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001832
1833 mutex_lock(&cfg80211_mutex);
1834 mutex_lock(&reg_mutex);
1835
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05001836 reset_regdomains(true);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001837 restore_alpha2(alpha2, reset_user);
1838
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001839 /*
1840 * If there's any pending requests we simply
1841 * stash them to a temporary pending queue and
1842 * add then after we've restored regulatory
1843 * settings.
1844 */
1845 spin_lock(&reg_requests_lock);
1846 if (!list_empty(&reg_requests_list)) {
1847 list_for_each_entry_safe(reg_request, tmp,
1848 &reg_requests_list, list) {
1849 if (reg_request->initiator !=
1850 NL80211_REGDOM_SET_BY_USER)
1851 continue;
1852 list_del(&reg_request->list);
1853 list_add_tail(&reg_request->list, &tmp_reg_req_list);
1854 }
1855 }
1856 spin_unlock(&reg_requests_lock);
1857
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001858 /* Clear beacon hints */
1859 spin_lock_bh(&reg_pending_beacons_lock);
1860 if (!list_empty(&reg_pending_beacons)) {
1861 list_for_each_entry_safe(reg_beacon, btmp,
1862 &reg_pending_beacons, list) {
1863 list_del(&reg_beacon->list);
1864 kfree(reg_beacon);
1865 }
1866 }
1867 spin_unlock_bh(&reg_pending_beacons_lock);
1868
1869 if (!list_empty(&reg_beacon_list)) {
1870 list_for_each_entry_safe(reg_beacon, btmp,
1871 &reg_beacon_list, list) {
1872 list_del(&reg_beacon->list);
1873 kfree(reg_beacon);
1874 }
1875 }
1876
1877 /* First restore to the basic regulatory settings */
1878 cfg80211_regdomain = cfg80211_world_regdom;
Dmitry Shmidtcee0bec2011-12-19 12:32:21 -08001879 world_alpha2[0] = cfg80211_regdomain->alpha2[0];
1880 world_alpha2[1] = cfg80211_regdomain->alpha2[1];
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001881
Rajkumar Manoharan5ce543d2011-12-07 21:50:08 +05301882 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1883 if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1884 restore_custom_reg_settings(&rdev->wiphy);
1885 }
1886
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001887 mutex_unlock(&reg_mutex);
1888 mutex_unlock(&cfg80211_mutex);
1889
Dmitry Shmidtcee0bec2011-12-19 12:32:21 -08001890 regulatory_hint_core(world_alpha2);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001891
1892 /*
1893 * This restores the ieee80211_regdom module parameter
1894 * preference or the last user requested regulatory
1895 * settings, user regulatory settings takes precedence.
1896 */
1897 if (is_an_alpha2(alpha2))
1898 regulatory_hint_user(user_alpha2);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001899
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001900 if (list_empty(&tmp_reg_req_list))
1901 return;
1902
1903 mutex_lock(&cfg80211_mutex);
1904 mutex_lock(&reg_mutex);
1905
1906 spin_lock(&reg_requests_lock);
1907 list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) {
1908 REG_DBG_PRINT("Adding request for country %c%c back "
1909 "into the queue\n",
1910 reg_request->alpha2[0],
1911 reg_request->alpha2[1]);
1912 list_del(&reg_request->list);
1913 list_add_tail(&reg_request->list, &reg_requests_list);
1914 }
1915 spin_unlock(&reg_requests_lock);
1916
1917 mutex_unlock(&reg_mutex);
1918 mutex_unlock(&cfg80211_mutex);
1919
1920 REG_DBG_PRINT("Kicking the queue\n");
1921
1922 schedule_work(&reg_work);
1923}
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001924
1925void regulatory_hint_disconnect(void)
1926{
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001927 REG_DBG_PRINT("All devices are disconnected, going to "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001928 "restore regulatory settings\n");
1929 restore_regulatory_settings(false);
1930}
1931
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001932static bool freq_is_chan_12_13_14(u16 freq)
1933{
Bruno Randolf59eb21a2011-01-17 13:37:28 +09001934 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
1935 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
1936 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001937 return true;
1938 return false;
1939}
1940
1941int regulatory_hint_found_beacon(struct wiphy *wiphy,
1942 struct ieee80211_channel *beacon_chan,
1943 gfp_t gfp)
1944{
1945 struct reg_beacon *reg_beacon;
1946
1947 if (likely((beacon_chan->beacon_found ||
1948 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1949 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1950 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1951 return 0;
1952
1953 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1954 if (!reg_beacon)
1955 return -ENOMEM;
1956
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001957 REG_DBG_PRINT("Found new beacon on "
Luis R. Rodriguez4113f752010-01-04 11:50:11 -05001958 "frequency: %d MHz (Ch %d) on %s\n",
1959 beacon_chan->center_freq,
1960 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1961 wiphy_name(wiphy));
1962
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001963 memcpy(&reg_beacon->chan, beacon_chan,
1964 sizeof(struct ieee80211_channel));
1965
1966
1967 /*
1968 * Since we can be called from BH or and non-BH context
1969 * we must use spin_lock_bh()
1970 */
1971 spin_lock_bh(&reg_pending_beacons_lock);
1972 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1973 spin_unlock_bh(&reg_pending_beacons_lock);
1974
1975 schedule_work(&reg_work);
1976
1977 return 0;
1978}
1979
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001980static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001981{
1982 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001983 const struct ieee80211_reg_rule *reg_rule = NULL;
1984 const struct ieee80211_freq_range *freq_range = NULL;
1985 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001986
Luis R. Rodriguez66533252011-12-20 12:23:37 -08001987 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001988
1989 for (i = 0; i < rd->n_reg_rules; i++) {
1990 reg_rule = &rd->reg_rules[i];
1991 freq_range = &reg_rule->freq_range;
1992 power_rule = &reg_rule->power_rule;
1993
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001994 /*
1995 * There may not be documentation for max antenna gain
1996 * in certain regions
1997 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001998 if (power_rule->max_antenna_gain)
Luis R. Rodriguez66533252011-12-20 12:23:37 -08001999 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002000 freq_range->start_freq_khz,
2001 freq_range->end_freq_khz,
2002 freq_range->max_bandwidth_khz,
2003 power_rule->max_antenna_gain,
2004 power_rule->max_eirp);
2005 else
Luis R. Rodriguez66533252011-12-20 12:23:37 -08002006 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002007 freq_range->start_freq_khz,
2008 freq_range->end_freq_khz,
2009 freq_range->max_bandwidth_khz,
2010 power_rule->max_eirp);
2011 }
2012}
2013
Luis R. Rodriguez8b60b072011-10-11 10:59:02 -07002014bool reg_supported_dfs_region(u8 dfs_region)
2015{
2016 switch (dfs_region) {
2017 case NL80211_DFS_UNSET:
2018 case NL80211_DFS_FCC:
2019 case NL80211_DFS_ETSI:
2020 case NL80211_DFS_JP:
2021 return true;
2022 default:
2023 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2024 dfs_region);
2025 return false;
2026 }
2027}
2028
2029static void print_dfs_region(u8 dfs_region)
2030{
2031 if (!dfs_region)
2032 return;
2033
2034 switch (dfs_region) {
2035 case NL80211_DFS_FCC:
2036 pr_info(" DFS Master region FCC");
2037 break;
2038 case NL80211_DFS_ETSI:
2039 pr_info(" DFS Master region ETSI");
2040 break;
2041 case NL80211_DFS_JP:
2042 pr_info(" DFS Master region JP");
2043 break;
2044 default:
2045 pr_info(" DFS Master region Uknown");
2046 break;
2047 }
2048}
2049
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002050static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002051{
2052
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002053 if (is_intersected_alpha2(rd->alpha2)) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002054
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002055 if (last_request->initiator ==
2056 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Johannes Berg79c97e92009-07-07 03:56:12 +02002057 struct cfg80211_registered_device *rdev;
2058 rdev = cfg80211_rdev_by_wiphy_idx(
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002059 last_request->wiphy_idx);
Johannes Berg79c97e92009-07-07 03:56:12 +02002060 if (rdev) {
Joe Perchese9c02682010-11-16 19:56:49 -08002061 pr_info("Current regulatory domain updated by AP to: %c%c\n",
Johannes Berg79c97e92009-07-07 03:56:12 +02002062 rdev->country_ie_alpha2[0],
2063 rdev->country_ie_alpha2[1]);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002064 } else
Joe Perchese9c02682010-11-16 19:56:49 -08002065 pr_info("Current regulatory domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002066 } else
Joe Perchese9c02682010-11-16 19:56:49 -08002067 pr_info("Current regulatory domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002068 } else if (is_world_regdom(rd->alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -08002069 pr_info("World regulatory domain updated:\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002070 else {
2071 if (is_unknown_alpha2(rd->alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -08002072 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002073 else
Joe Perchese9c02682010-11-16 19:56:49 -08002074 pr_info("Regulatory domain changed to country: %c%c\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002075 rd->alpha2[0], rd->alpha2[1]);
2076 }
Luis R. Rodriguez8b60b072011-10-11 10:59:02 -07002077 print_dfs_region(rd->dfs_region);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002078 print_rd_rules(rd);
2079}
2080
Johannes Berg2df78162008-10-28 16:49:41 +01002081static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002082{
Joe Perchese9c02682010-11-16 19:56:49 -08002083 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002084 print_rd_rules(rd);
2085}
2086
Johannes Bergd2372b32008-10-24 20:32:20 +02002087/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002088static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002089{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002090 const struct ieee80211_regdomain *intersected_rd = NULL;
Johannes Berg79c97e92009-07-07 03:56:12 +02002091 struct cfg80211_registered_device *rdev = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002092 struct wiphy *request_wiphy;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002093 /* Some basic sanity checks first */
2094
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002095 if (is_world_regdom(rd->alpha2)) {
Johannes Bergf6037d02008-10-21 11:01:33 +02002096 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002097 return -EINVAL;
2098 update_world_regdomain(rd);
2099 return 0;
2100 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002101
2102 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2103 !is_unknown_alpha2(rd->alpha2))
2104 return -EINVAL;
2105
Johannes Bergf6037d02008-10-21 11:01:33 +02002106 if (!last_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002107 return -EINVAL;
2108
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002109 /*
2110 * Lets only bother proceeding on the same alpha2 if the current
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002111 * rd is non static (it means CRDA was present and was used last)
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002112 * and the pending request came in from a country IE
2113 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002114 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002115 /*
2116 * If someone else asked us to change the rd lets only bother
2117 * checking if the alpha2 changes if CRDA was already called
2118 */
John W. Linvillebaeb66f2009-12-18 17:59:02 -05002119 if (!regdom_changes(rd->alpha2))
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002120 return -EINVAL;
2121 }
2122
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002123 /*
2124 * Now lets set the regulatory domain, update all driver channels
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002125 * and finally inform them of what we have done, in case they want
2126 * to review or adjust their own settings based on their own
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002127 * internal EEPROM data
2128 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002129
Johannes Bergf6037d02008-10-21 11:01:33 +02002130 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002131 return -EINVAL;
2132
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08002133 if (!is_valid_rd(rd)) {
Joe Perchese9c02682010-11-16 19:56:49 -08002134 pr_err("Invalid regulatory domain detected:\n");
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08002135 print_regdomain_info(rd);
2136 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002137 }
2138
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002139 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
Luis R. Rodriguez0bac71a2011-11-28 16:47:16 -05002140 if (!request_wiphy &&
2141 (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2142 last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) {
2143 schedule_delayed_work(&reg_timeout, 0);
Johannes Bergde3584b2011-11-21 10:44:00 +01002144 return -ENODEV;
2145 }
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002146
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002147 if (!last_request->intersect) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002148 int r;
2149
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002150 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05002151 reset_regdomains(false);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002152 cfg80211_regdomain = rd;
2153 return 0;
2154 }
2155
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002156 /*
2157 * For a driver hint, lets copy the regulatory domain the
2158 * driver wanted to the wiphy to deal with conflicts
2159 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002160
Luis R. Rodriguez558f6d32009-06-08 18:54:37 -07002161 /*
2162 * Userspace could have sent two replies with only
2163 * one kernel request.
2164 */
2165 if (request_wiphy->regd)
2166 return -EALREADY;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002167
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002168 r = reg_copy_regd(&request_wiphy->regd, rd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002169 if (r)
2170 return r;
2171
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05002172 reset_regdomains(false);
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002173 cfg80211_regdomain = rd;
2174 return 0;
2175 }
2176
2177 /* Intersection requires a bit more work */
2178
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002179 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002180
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002181 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2182 if (!intersected_rd)
2183 return -EINVAL;
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002184
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002185 /*
2186 * We can trash what CRDA provided now.
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002187 * However if a driver requested this specific regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002188 * domain we keep it for its private use
2189 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002190 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002191 request_wiphy->regd = rd;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002192 else
2193 kfree(rd);
2194
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002195 rd = NULL;
2196
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05002197 reset_regdomains(false);
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002198 cfg80211_regdomain = intersected_rd;
2199
2200 return 0;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002201 }
2202
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002203 if (!intersected_rd)
2204 return -EINVAL;
2205
Johannes Berg79c97e92009-07-07 03:56:12 +02002206 rdev = wiphy_to_dev(request_wiphy);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002207
Johannes Berg79c97e92009-07-07 03:56:12 +02002208 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2209 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2210 rdev->env = last_request->country_ie_env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002211
2212 BUG_ON(intersected_rd == rd);
2213
2214 kfree(rd);
2215 rd = NULL;
2216
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05002217 reset_regdomains(false);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002218 cfg80211_regdomain = intersected_rd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002219
2220 return 0;
2221}
2222
2223
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002224/*
2225 * Use this call to set the current regulatory domain. Conflicts with
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002226 * multiple drivers can be ironed out later. Caller must've already
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002227 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2228 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002229int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002230{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002231 int r;
2232
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05002233 assert_cfg80211_lock();
2234
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002235 mutex_lock(&reg_mutex);
2236
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002237 /* Note that this doesn't update the wiphys, this is done below */
2238 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +02002239 if (r) {
2240 kfree(rd);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002241 mutex_unlock(&reg_mutex);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002242 return r;
Johannes Bergd2372b32008-10-24 20:32:20 +02002243 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002244
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002245 /* This would make this whole thing pointless */
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08002246 if (!last_request->intersect)
2247 BUG_ON(rd != cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002248
2249 /* update all wiphys now with the new established regulatory domain */
Johannes Bergf6037d02008-10-21 11:01:33 +02002250 update_all_wiphy_regulatory(last_request->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002251
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08002252 print_regdomain(cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002253
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04002254 nl80211_send_reg_change_event(last_request);
2255
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08002256 reg_set_request_processed();
2257
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002258 mutex_unlock(&reg_mutex);
2259
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002260 return r;
2261}
2262
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002263#ifdef CONFIG_HOTPLUG
2264int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2265{
2266 if (last_request && !last_request->processed) {
2267 if (add_uevent_var(env, "COUNTRY=%c%c",
2268 last_request->alpha2[0],
2269 last_request->alpha2[1]))
2270 return -ENOMEM;
2271 }
2272
2273 return 0;
2274}
2275#else
2276int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2277{
2278 return -ENODEV;
2279}
2280#endif /* CONFIG_HOTPLUG */
2281
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002282/* Caller must hold cfg80211_mutex */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002283void reg_device_remove(struct wiphy *wiphy)
2284{
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04002285 struct wiphy *request_wiphy = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002286
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05002287 assert_cfg80211_lock();
2288
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002289 mutex_lock(&reg_mutex);
2290
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002291 kfree(wiphy->regd);
2292
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04002293 if (last_request)
2294 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002295
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002296 if (!request_wiphy || request_wiphy != wiphy)
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002297 goto out;
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002298
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002299 last_request->wiphy_idx = WIPHY_IDX_STALE;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002300 last_request->country_ie_env = ENVIRON_ANY;
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002301out:
2302 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002303}
2304
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002305static void reg_timeout_work(struct work_struct *work)
2306{
2307 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "
Joe Perches12c5ffb2011-07-29 14:51:25 -07002308 "restoring regulatory settings\n");
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002309 restore_regulatory_settings(true);
2310}
2311
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002312int __init regulatory_init(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002313{
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002314 int err = 0;
Johannes Berg734366d2008-09-15 10:56:48 +02002315
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002316 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2317 if (IS_ERR(reg_pdev))
2318 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002319
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002320 reg_pdev->dev.type = &reg_device_type;
2321
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002322 spin_lock_init(&reg_requests_lock);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002323 spin_lock_init(&reg_pending_beacons_lock);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002324
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002325 cfg80211_regdomain = cfg80211_world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +02002326
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05002327 user_alpha2[0] = '9';
2328 user_alpha2[1] = '7';
2329
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002330 /* We always try to get an update for the static regdomain */
2331 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002332 if (err) {
2333 if (err == -ENOMEM)
2334 return err;
2335 /*
2336 * N.B. kobject_uevent_env() can fail mainly for when we're out
2337 * memory which is handled and propagated appropriately above
2338 * but it can also fail during a netlink_broadcast() or during
2339 * early boot for call_usermodehelper(). For now treat these
2340 * errors as non-fatal.
2341 */
Joe Perchese9c02682010-11-16 19:56:49 -08002342 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002343#ifdef CONFIG_CFG80211_REG_DEBUG
2344 /* We want to find out exactly why when debugging */
2345 WARN_ON(err);
2346#endif
2347 }
Johannes Berg734366d2008-09-15 10:56:48 +02002348
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002349 /*
2350 * Finally, if the user set the module parameter treat it
2351 * as a user hint.
2352 */
2353 if (!is_world_regdom(ieee80211_regdom))
2354 regulatory_hint_user(ieee80211_regdom);
2355
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002356 return 0;
2357}
2358
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002359void /* __init_or_exit */ regulatory_exit(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002360{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002361 struct regulatory_request *reg_request, *tmp;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002362 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002363
2364 cancel_work_sync(&reg_work);
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002365 cancel_delayed_work_sync(&reg_timeout);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002366
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002367 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002368 mutex_lock(&reg_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +02002369
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05002370 reset_regdomains(true);
Johannes Berg734366d2008-09-15 10:56:48 +02002371
Luis R. Rodriguez58ebacc2011-11-08 14:28:06 -08002372 dev_set_uevent_suppress(&reg_pdev->dev, true);
Johannes Bergf6037d02008-10-21 11:01:33 +02002373
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002374 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002375
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002376 spin_lock_bh(&reg_pending_beacons_lock);
2377 if (!list_empty(&reg_pending_beacons)) {
2378 list_for_each_entry_safe(reg_beacon, btmp,
2379 &reg_pending_beacons, list) {
2380 list_del(&reg_beacon->list);
2381 kfree(reg_beacon);
2382 }
2383 }
2384 spin_unlock_bh(&reg_pending_beacons_lock);
2385
2386 if (!list_empty(&reg_beacon_list)) {
2387 list_for_each_entry_safe(reg_beacon, btmp,
2388 &reg_beacon_list, list) {
2389 list_del(&reg_beacon->list);
2390 kfree(reg_beacon);
2391 }
2392 }
2393
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002394 spin_lock(&reg_requests_lock);
2395 if (!list_empty(&reg_requests_list)) {
2396 list_for_each_entry_safe(reg_request, tmp,
2397 &reg_requests_list, list) {
2398 list_del(&reg_request->list);
2399 kfree(reg_request);
2400 }
2401 }
2402 spin_unlock(&reg_requests_lock);
2403
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002404 mutex_unlock(&reg_mutex);
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002405 mutex_unlock(&cfg80211_mutex);
Johannes Berg8318d782008-01-24 19:38:38 +01002406}