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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. Rodriguezb2e1b302008-09-09 23:19:48 -07005 * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com>
Johannes Berg8318d782008-01-24 19:38:38 +01006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070012/**
13 * DOC: Wireless regulatory infrastructure
Johannes Berg8318d782008-01-24 19:38:38 +010014 *
15 * The usual implementation is for a driver to read a device EEPROM to
16 * determine which regulatory domain it should be operating under, then
17 * looking up the allowable channels in a driver-local table and finally
18 * registering those channels in the wiphy structure.
19 *
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070020 * Another set of compliance enforcement is for drivers to use their
21 * own compliance limits which can be stored on the EEPROM. The host
22 * driver or firmware may ensure these are used.
23 *
24 * In addition to all this we provide an extra layer of regulatory
25 * conformance. For drivers which do not have any regulatory
26 * information CRDA provides the complete regulatory solution.
27 * For others it provides a community effort on further restrictions
28 * to enhance compliance.
29 *
30 * Note: When number of rules --> infinity we will not be able to
31 * index on alpha2 any more, instead we'll probably have to
32 * rely on some SHA1 checksum of the regdomain for example.
33 *
Johannes Berg8318d782008-01-24 19:38:38 +010034 */
Joe Perchese9c02682010-11-16 19:56:49 -080035
36#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
37
Johannes Berg8318d782008-01-24 19:38:38 +010038#include <linux/kernel.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040039#include <linux/export.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070041#include <linux/list.h>
42#include <linux/random.h>
John W. Linvillec61029c2010-08-05 14:26:24 -040043#include <linux/ctype.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070044#include <linux/nl80211.h>
45#include <linux/platform_device.h>
Paul Gortmakerd9b93842011-09-18 13:21:27 -040046#include <linux/moduleparam.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070047#include <net/cfg80211.h>
Johannes Berg8318d782008-01-24 19:38:38 +010048#include "core.h"
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070049#include "reg.h"
John W. Linville3b377ea2009-12-18 17:59:01 -050050#include "regdb.h"
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -040051#include "nl80211.h"
Johannes Berg8318d782008-01-24 19:38:38 +010052
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050053#ifdef CONFIG_CFG80211_REG_DEBUG
Joe Perches12c5ffb2011-07-29 14:51:25 -070054#define REG_DBG_PRINT(format, args...) \
55 printk(KERN_DEBUG pr_fmt(format), ##args)
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050056#else
John W. Linville82711952010-01-05 17:57:20 -050057#define REG_DBG_PRINT(args...)
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050058#endif
59
Luis R. Rodrigueza0429942011-11-28 16:47:15 -050060static struct regulatory_request core_request_world = {
61 .initiator = NL80211_REGDOM_SET_BY_CORE,
62 .alpha2[0] = '0',
63 .alpha2[1] = '0',
64 .intersect = false,
65 .processed = true,
66 .country_ie_env = ENVIRON_ANY,
67};
68
Luis R. Rodriguez5166ccd2008-10-30 13:33:56 -070069/* Receipt of information from last regulatory request */
Luis R. Rodrigueza0429942011-11-28 16:47:15 -050070static struct regulatory_request *last_request = &core_request_world;
Johannes Berg734366d2008-09-15 10:56:48 +020071
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070072/* To trigger userspace events */
73static struct platform_device *reg_pdev;
Johannes Berg8318d782008-01-24 19:38:38 +010074
Scott James Remnant4d9d88d2011-03-08 10:45:30 -080075static struct device_type reg_device_type = {
76 .uevent = reg_device_uevent,
77};
78
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050079/*
80 * Central wireless core regulatory domains, we only need two,
Johannes Berg734366d2008-09-15 10:56:48 +020081 * the current one and a world regulatory domain in case we have no
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050082 * information to give us an alpha2
83 */
Luis R. Rodriguezf1303472009-01-30 09:26:42 -080084const struct ieee80211_regdomain *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +020085
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050086/*
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070087 * Protects static reg.c components:
88 * - cfg80211_world_regdom
89 * - cfg80211_regdom
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070090 * - last_request
91 */
John W. Linville670b7f12010-06-24 11:26:31 -040092static DEFINE_MUTEX(reg_mutex);
Johannes Berg46a5eba2010-09-15 13:28:15 +020093
94static inline void assert_reg_lock(void)
95{
96 lockdep_assert_held(&reg_mutex);
97}
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070098
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -050099/* Used to queue up regulatory hints */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500100static LIST_HEAD(reg_requests_list);
101static spinlock_t reg_requests_lock;
102
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500103/* Used to queue up beacon hints for review */
104static LIST_HEAD(reg_pending_beacons);
105static spinlock_t reg_pending_beacons_lock;
106
107/* Used to keep track of processed beacon hints */
108static LIST_HEAD(reg_beacon_list);
109
110struct reg_beacon {
111 struct list_head list;
112 struct ieee80211_channel chan;
113};
114
Luis R. Rodriguezf333a7a2010-11-17 21:46:07 -0800115static void reg_todo(struct work_struct *work);
116static DECLARE_WORK(reg_work, reg_todo);
117
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -0700118static void reg_timeout_work(struct work_struct *work);
119static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
120
Johannes Berg734366d2008-09-15 10:56:48 +0200121/* We keep a static world regulatory domain in case of the absence of CRDA */
122static const struct ieee80211_regdomain world_regdom = {
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800123 .n_reg_rules = 5,
Johannes Berg734366d2008-09-15 10:56:48 +0200124 .alpha2 = "00",
125 .reg_rules = {
Luis R. Rodriguez68798a62009-02-21 00:20:37 -0500126 /* IEEE 802.11b/g, channels 1..11 */
127 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800128 /* IEEE 802.11b/g, channels 12..13. No HT40
129 * channel fits here. */
130 REG_RULE(2467-10, 2472+10, 20, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500131 NL80211_RRF_PASSIVE_SCAN |
132 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800133 /* IEEE 802.11 channel 14 - Only JP enables
134 * this and for 802.11b only */
135 REG_RULE(2484-10, 2484+10, 20, 6, 20,
136 NL80211_RRF_PASSIVE_SCAN |
137 NL80211_RRF_NO_IBSS |
138 NL80211_RRF_NO_OFDM),
139 /* IEEE 802.11a, channel 36..48 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800140 REG_RULE(5180-10, 5240+10, 40, 6, 20,
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800141 NL80211_RRF_PASSIVE_SCAN |
142 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500143
144 /* NB: 5260 MHz - 5700 MHz requies DFS */
145
146 /* IEEE 802.11a, channel 149..165 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800147 REG_RULE(5745-10, 5825+10, 40, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500148 NL80211_RRF_PASSIVE_SCAN |
149 NL80211_RRF_NO_IBSS),
Johannes Berg734366d2008-09-15 10:56:48 +0200150 }
151};
152
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200153static const struct ieee80211_regdomain *cfg80211_world_regdom =
154 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200155
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400156static char *ieee80211_regdom = "00";
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500157static char user_alpha2[2];
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400158
Johannes Berg734366d2008-09-15 10:56:48 +0200159module_param(ieee80211_regdom, charp, 0444);
160MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
161
Luis R. Rodrigueza0429942011-11-28 16:47:15 -0500162static void reset_regdomains(bool full_reset)
Johannes Berg734366d2008-09-15 10:56:48 +0200163{
Johannes Berg942b25c2008-09-15 11:26:47 +0200164 /* avoid freeing static information or freeing something twice */
165 if (cfg80211_regdomain == cfg80211_world_regdom)
166 cfg80211_regdomain = NULL;
167 if (cfg80211_world_regdom == &world_regdom)
168 cfg80211_world_regdom = NULL;
169 if (cfg80211_regdomain == &world_regdom)
170 cfg80211_regdomain = NULL;
Johannes Berg942b25c2008-09-15 11:26:47 +0200171
172 kfree(cfg80211_regdomain);
173 kfree(cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200174
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200175 cfg80211_world_regdom = &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200176 cfg80211_regdomain = NULL;
Luis R. Rodrigueza0429942011-11-28 16:47:15 -0500177
178 if (!full_reset)
179 return;
180
181 if (last_request != &core_request_world)
182 kfree(last_request);
183 last_request = &core_request_world;
Johannes Berg734366d2008-09-15 10:56:48 +0200184}
185
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500186/*
187 * Dynamic world regulatory domain requested by the wireless
188 * core upon initialization
189 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200190static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200191{
Johannes Bergf6037d02008-10-21 11:01:33 +0200192 BUG_ON(!last_request);
Johannes Berg734366d2008-09-15 10:56:48 +0200193
Luis R. Rodrigueza0429942011-11-28 16:47:15 -0500194 reset_regdomains(false);
Johannes Berg734366d2008-09-15 10:56:48 +0200195
196 cfg80211_world_regdom = rd;
197 cfg80211_regdomain = rd;
198}
Johannes Berg734366d2008-09-15 10:56:48 +0200199
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200200bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100201{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700202 if (!alpha2)
203 return false;
204 if (alpha2[0] == '0' && alpha2[1] == '0')
205 return true;
206 return false;
Johannes Berg8318d782008-01-24 19:38:38 +0100207}
208
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200209static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700210{
211 if (!alpha2)
212 return false;
213 if (alpha2[0] != 0 && alpha2[1] != 0)
214 return true;
215 return false;
216}
Johannes Berg8318d782008-01-24 19:38:38 +0100217
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200218static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700219{
220 if (!alpha2)
221 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500222 /*
223 * Special case where regulatory domain was built by driver
224 * but a specific alpha2 cannot be determined
225 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700226 if (alpha2[0] == '9' && alpha2[1] == '9')
227 return true;
228 return false;
229}
230
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800231static bool is_intersected_alpha2(const char *alpha2)
232{
233 if (!alpha2)
234 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500235 /*
236 * Special case where regulatory domain is the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800237 * result of an intersection between two regulatory domain
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500238 * structures
239 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800240 if (alpha2[0] == '9' && alpha2[1] == '8')
241 return true;
242 return false;
243}
244
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200245static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700246{
247 if (!alpha2)
248 return false;
John W. Linvillec61029c2010-08-05 14:26:24 -0400249 if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700250 return true;
251 return false;
252}
253
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200254static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700255{
256 if (!alpha2_x || !alpha2_y)
257 return false;
258 if (alpha2_x[0] == alpha2_y[0] &&
259 alpha2_x[1] == alpha2_y[1])
260 return true;
261 return false;
262}
263
Luis R. Rodriguez69b15722009-02-21 00:04:33 -0500264static bool regdom_changes(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700265{
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500266 assert_cfg80211_lock();
267
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700268 if (!cfg80211_regdomain)
269 return true;
270 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
271 return false;
272 return true;
273}
274
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500275/*
276 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
277 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
278 * has ever been issued.
279 */
280static bool is_user_regdom_saved(void)
281{
282 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
283 return false;
284
285 /* This would indicate a mistake on the design */
286 if (WARN((!is_world_regdom(user_alpha2) &&
287 !is_an_alpha2(user_alpha2)),
288 "Unexpected user alpha2: %c%c\n",
289 user_alpha2[0],
290 user_alpha2[1]))
291 return false;
292
293 return true;
294}
295
John W. Linville3b377ea2009-12-18 17:59:01 -0500296static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
297 const struct ieee80211_regdomain *src_regd)
298{
299 struct ieee80211_regdomain *regd;
300 int size_of_regd = 0;
301 unsigned int i;
302
303 size_of_regd = sizeof(struct ieee80211_regdomain) +
304 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
305
306 regd = kzalloc(size_of_regd, GFP_KERNEL);
307 if (!regd)
308 return -ENOMEM;
309
310 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
311
312 for (i = 0; i < src_regd->n_reg_rules; i++)
313 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
314 sizeof(struct ieee80211_reg_rule));
315
316 *dst_regd = regd;
317 return 0;
318}
319
320#ifdef CONFIG_CFG80211_INTERNAL_REGDB
321struct reg_regdb_search_request {
322 char alpha2[2];
323 struct list_head list;
324};
325
326static LIST_HEAD(reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400327static DEFINE_MUTEX(reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500328
329static void reg_regdb_search(struct work_struct *work)
330{
331 struct reg_regdb_search_request *request;
332 const struct ieee80211_regdomain *curdom, *regdom;
333 int i, r;
334
John W. Linville368d06f2010-03-16 15:40:59 -0400335 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500336 while (!list_empty(&reg_regdb_search_list)) {
337 request = list_first_entry(&reg_regdb_search_list,
338 struct reg_regdb_search_request,
339 list);
340 list_del(&request->list);
341
342 for (i=0; i<reg_regdb_size; i++) {
343 curdom = reg_regdb[i];
344
345 if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
346 r = reg_copy_regd(&regdom, curdom);
347 if (r)
348 break;
John W. Linville3b377ea2009-12-18 17:59:01 -0500349 mutex_lock(&cfg80211_mutex);
350 set_regdom(regdom);
351 mutex_unlock(&cfg80211_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500352 break;
353 }
354 }
355
356 kfree(request);
357 }
John W. Linville368d06f2010-03-16 15:40:59 -0400358 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500359}
360
361static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
362
363static void reg_regdb_query(const char *alpha2)
364{
365 struct reg_regdb_search_request *request;
366
367 if (!alpha2)
368 return;
369
370 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
371 if (!request)
372 return;
373
374 memcpy(request->alpha2, alpha2, 2);
375
John W. Linville368d06f2010-03-16 15:40:59 -0400376 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500377 list_add_tail(&request->list, &reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400378 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500379
380 schedule_work(&reg_regdb_work);
381}
382#else
383static inline void reg_regdb_query(const char *alpha2) {}
384#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
385
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500386/*
387 * This lets us keep regulatory code which is updated on a regulatory
Scott James Remnant4d9d88d2011-03-08 10:45:30 -0800388 * basis in userspace. Country information is filled in by
389 * reg_device_uevent
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500390 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700391static int call_crda(const char *alpha2)
392{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700393 if (!is_world_regdom((char *) alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -0800394 pr_info("Calling CRDA for country: %c%c\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700395 alpha2[0], alpha2[1]);
396 else
Joe Perchese9c02682010-11-16 19:56:49 -0800397 pr_info("Calling CRDA to update world regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700398
John W. Linville3b377ea2009-12-18 17:59:01 -0500399 /* query internal regulatory database (if it exists) */
400 reg_regdb_query(alpha2);
401
Scott James Remnant4d9d88d2011-03-08 10:45:30 -0800402 return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700403}
404
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700405/* Used by nl80211 before kmalloc'ing our regulatory domain */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200406bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700407{
Luis R. Rodriguez61405e92009-05-13 17:04:41 -0400408 assert_cfg80211_lock();
409
Johannes Bergf6037d02008-10-21 11:01:33 +0200410 if (!last_request)
411 return false;
412
413 return alpha2_equal(last_request->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700414}
415
416/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200417static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700418{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200419 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700420 u32 freq_diff;
421
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800422 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700423 return false;
424
425 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
426 return false;
427
428 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
429
Roel Kluinbd05f282009-03-03 22:55:21 +0100430 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
431 freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700432 return false;
433
434 return true;
435}
436
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200437static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700438{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200439 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700440 unsigned int i;
441
442 if (!rd->n_reg_rules)
443 return false;
444
Luis R. Rodriguez88dc1c32008-11-12 14:22:01 -0800445 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
446 return false;
447
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700448 for (i = 0; i < rd->n_reg_rules; i++) {
449 reg_rule = &rd->reg_rules[i];
450 if (!is_valid_reg_rule(reg_rule))
451 return false;
452 }
453
454 return true;
455}
456
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400457static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
458 u32 center_freq_khz,
459 u32 bw_khz)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700460{
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400461 u32 start_freq_khz, end_freq_khz;
462
463 start_freq_khz = center_freq_khz - (bw_khz/2);
464 end_freq_khz = center_freq_khz + (bw_khz/2);
465
466 if (start_freq_khz >= freq_range->start_freq_khz &&
467 end_freq_khz <= freq_range->end_freq_khz)
468 return true;
469
470 return false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700471}
472
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800473/**
474 * freq_in_rule_band - tells us if a frequency is in a frequency band
475 * @freq_range: frequency rule we want to query
476 * @freq_khz: frequency we are inquiring about
477 *
478 * This lets us know if a specific frequency rule is or is not relevant to
479 * a specific frequency's band. Bands are device specific and artificial
480 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
481 * safe for now to assume that a frequency rule should not be part of a
482 * frequency's band if the start freq or end freq are off by more than 2 GHz.
483 * This resolution can be lowered and should be considered as we add
484 * regulatory rule support for other "bands".
485 **/
486static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
487 u32 freq_khz)
488{
489#define ONE_GHZ_IN_KHZ 1000000
490 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
491 return true;
492 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
493 return true;
494 return false;
495#undef ONE_GHZ_IN_KHZ
496}
497
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500498/*
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500499 * Helper for regdom_intersect(), this does the real
500 * mathematical intersection fun
501 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700502static int reg_rules_intersect(
503 const struct ieee80211_reg_rule *rule1,
504 const struct ieee80211_reg_rule *rule2,
505 struct ieee80211_reg_rule *intersected_rule)
506{
507 const struct ieee80211_freq_range *freq_range1, *freq_range2;
508 struct ieee80211_freq_range *freq_range;
509 const struct ieee80211_power_rule *power_rule1, *power_rule2;
510 struct ieee80211_power_rule *power_rule;
511 u32 freq_diff;
512
513 freq_range1 = &rule1->freq_range;
514 freq_range2 = &rule2->freq_range;
515 freq_range = &intersected_rule->freq_range;
516
517 power_rule1 = &rule1->power_rule;
518 power_rule2 = &rule2->power_rule;
519 power_rule = &intersected_rule->power_rule;
520
521 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
522 freq_range2->start_freq_khz);
523 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
524 freq_range2->end_freq_khz);
525 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
526 freq_range2->max_bandwidth_khz);
527
528 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
529 if (freq_range->max_bandwidth_khz > freq_diff)
530 freq_range->max_bandwidth_khz = freq_diff;
531
532 power_rule->max_eirp = min(power_rule1->max_eirp,
533 power_rule2->max_eirp);
534 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
535 power_rule2->max_antenna_gain);
536
537 intersected_rule->flags = (rule1->flags | rule2->flags);
538
539 if (!is_valid_reg_rule(intersected_rule))
540 return -EINVAL;
541
542 return 0;
543}
544
545/**
546 * regdom_intersect - do the intersection between two regulatory domains
547 * @rd1: first regulatory domain
548 * @rd2: second regulatory domain
549 *
550 * Use this function to get the intersection between two regulatory domains.
551 * Once completed we will mark the alpha2 for the rd as intersected, "98",
552 * as no one single alpha2 can represent this regulatory domain.
553 *
554 * Returns a pointer to the regulatory domain structure which will hold the
555 * resulting intersection of rules between rd1 and rd2. We will
556 * kzalloc() this structure for you.
557 */
558static struct ieee80211_regdomain *regdom_intersect(
559 const struct ieee80211_regdomain *rd1,
560 const struct ieee80211_regdomain *rd2)
561{
562 int r, size_of_regd;
563 unsigned int x, y;
564 unsigned int num_rules = 0, rule_idx = 0;
565 const struct ieee80211_reg_rule *rule1, *rule2;
566 struct ieee80211_reg_rule *intersected_rule;
567 struct ieee80211_regdomain *rd;
568 /* This is just a dummy holder to help us count */
569 struct ieee80211_reg_rule irule;
570
571 /* Uses the stack temporarily for counter arithmetic */
572 intersected_rule = &irule;
573
574 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
575
576 if (!rd1 || !rd2)
577 return NULL;
578
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500579 /*
580 * First we get a count of the rules we'll need, then we actually
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700581 * build them. This is to so we can malloc() and free() a
582 * regdomain once. The reason we use reg_rules_intersect() here
583 * is it will return -EINVAL if the rule computed makes no sense.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500584 * All rules that do check out OK are valid.
585 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700586
587 for (x = 0; x < rd1->n_reg_rules; x++) {
588 rule1 = &rd1->reg_rules[x];
589 for (y = 0; y < rd2->n_reg_rules; y++) {
590 rule2 = &rd2->reg_rules[y];
591 if (!reg_rules_intersect(rule1, rule2,
592 intersected_rule))
593 num_rules++;
594 memset(intersected_rule, 0,
595 sizeof(struct ieee80211_reg_rule));
596 }
597 }
598
599 if (!num_rules)
600 return NULL;
601
602 size_of_regd = sizeof(struct ieee80211_regdomain) +
603 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
604
605 rd = kzalloc(size_of_regd, GFP_KERNEL);
606 if (!rd)
607 return NULL;
608
609 for (x = 0; x < rd1->n_reg_rules; x++) {
610 rule1 = &rd1->reg_rules[x];
611 for (y = 0; y < rd2->n_reg_rules; y++) {
612 rule2 = &rd2->reg_rules[y];
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500613 /*
614 * This time around instead of using the stack lets
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700615 * write to the target rule directly saving ourselves
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500616 * a memcpy()
617 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700618 intersected_rule = &rd->reg_rules[rule_idx];
619 r = reg_rules_intersect(rule1, rule2,
620 intersected_rule);
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500621 /*
622 * No need to memset here the intersected rule here as
623 * we're not using the stack anymore
624 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700625 if (r)
626 continue;
627 rule_idx++;
628 }
629 }
630
631 if (rule_idx != num_rules) {
632 kfree(rd);
633 return NULL;
634 }
635
636 rd->n_reg_rules = num_rules;
637 rd->alpha2[0] = '9';
638 rd->alpha2[1] = '8';
639
640 return rd;
641}
642
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500643/*
644 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
645 * want to just have the channel structure use these
646 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700647static u32 map_regdom_flags(u32 rd_flags)
648{
649 u32 channel_flags = 0;
650 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
651 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
652 if (rd_flags & NL80211_RRF_NO_IBSS)
653 channel_flags |= IEEE80211_CHAN_NO_IBSS;
654 if (rd_flags & NL80211_RRF_DFS)
655 channel_flags |= IEEE80211_CHAN_RADAR;
656 return channel_flags;
657}
658
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800659static int freq_reg_info_regd(struct wiphy *wiphy,
660 u32 center_freq,
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400661 u32 desired_bw_khz,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800662 const struct ieee80211_reg_rule **reg_rule,
663 const struct ieee80211_regdomain *custom_regd)
Johannes Berg8318d782008-01-24 19:38:38 +0100664{
665 int i;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800666 bool band_rule_found = false;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800667 const struct ieee80211_regdomain *regd;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400668 bool bw_fits = false;
669
670 if (!desired_bw_khz)
671 desired_bw_khz = MHZ_TO_KHZ(20);
Johannes Berg8318d782008-01-24 19:38:38 +0100672
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800673 regd = custom_regd ? custom_regd : cfg80211_regdomain;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800674
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500675 /*
676 * Follow the driver's regulatory domain, if present, unless a country
677 * IE has been processed or a user wants to help complaince further
678 */
Luis R. Rodriguez2784fe92010-12-15 19:24:11 -0800679 if (!custom_regd &&
680 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400681 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800682 wiphy->regd)
683 regd = wiphy->regd;
684
685 if (!regd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700686 return -EINVAL;
687
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800688 for (i = 0; i < regd->n_reg_rules; i++) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700689 const struct ieee80211_reg_rule *rr;
690 const struct ieee80211_freq_range *fr = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700691
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800692 rr = &regd->reg_rules[i];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700693 fr = &rr->freq_range;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800694
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500695 /*
696 * We only need to know if one frequency rule was
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800697 * was in center_freq's band, that's enough, so lets
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500698 * not overwrite it once found
699 */
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800700 if (!band_rule_found)
701 band_rule_found = freq_in_rule_band(fr, center_freq);
702
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400703 bw_fits = reg_does_bw_fit(fr,
704 center_freq,
705 desired_bw_khz);
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800706
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400707 if (band_rule_found && bw_fits) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700708 *reg_rule = rr;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400709 return 0;
Johannes Berg8318d782008-01-24 19:38:38 +0100710 }
711 }
712
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800713 if (!band_rule_found)
714 return -ERANGE;
715
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400716 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700717}
718
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400719int freq_reg_info(struct wiphy *wiphy,
720 u32 center_freq,
721 u32 desired_bw_khz,
722 const struct ieee80211_reg_rule **reg_rule)
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800723{
Luis R. Rodriguezac46d482009-05-01 18:44:50 -0400724 assert_cfg80211_lock();
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400725 return freq_reg_info_regd(wiphy,
726 center_freq,
727 desired_bw_khz,
728 reg_rule,
729 NULL);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800730}
John W. Linville4f366c52010-07-15 14:57:33 -0400731EXPORT_SYMBOL(freq_reg_info);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700732
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530733#ifdef CONFIG_CFG80211_REG_DEBUG
734static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
735{
736 switch (initiator) {
737 case NL80211_REGDOM_SET_BY_CORE:
738 return "Set by core";
739 case NL80211_REGDOM_SET_BY_USER:
740 return "Set by user";
741 case NL80211_REGDOM_SET_BY_DRIVER:
742 return "Set by driver";
743 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
744 return "Set by country IE";
745 default:
746 WARN_ON(1);
747 return "Set by bug";
748 }
749}
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530750
751static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
752 u32 desired_bw_khz,
753 const struct ieee80211_reg_rule *reg_rule)
754{
755 const struct ieee80211_power_rule *power_rule;
756 const struct ieee80211_freq_range *freq_range;
757 char max_antenna_gain[32];
758
759 power_rule = &reg_rule->power_rule;
760 freq_range = &reg_rule->freq_range;
761
762 if (!power_rule->max_antenna_gain)
763 snprintf(max_antenna_gain, 32, "N/A");
764 else
765 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
766
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700767 REG_DBG_PRINT("Updating information on frequency %d MHz "
Bob Copelandff039c62010-12-29 17:09:02 -0500768 "for a %d MHz width channel with regulatory rule:\n",
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530769 chan->center_freq,
770 KHZ_TO_MHZ(desired_bw_khz));
771
Pavel Roskin56e67862011-09-01 11:54:12 -0400772 REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530773 freq_range->start_freq_khz,
774 freq_range->end_freq_khz,
Pavel Roskin56e67862011-09-01 11:54:12 -0400775 freq_range->max_bandwidth_khz,
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530776 max_antenna_gain,
777 power_rule->max_eirp);
778}
779#else
780static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
781 u32 desired_bw_khz,
782 const struct ieee80211_reg_rule *reg_rule)
783{
784 return;
785}
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530786#endif
787
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400788/*
789 * Note that right now we assume the desired channel bandwidth
790 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
791 * per channel, the primary and the extension channel). To support
792 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
793 * new ieee80211_channel.target_bw and re run the regulatory check
794 * on the wiphy with the target_bw specified. Then we can simply use
795 * that below for the desired_bw_khz below.
796 */
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700797static void handle_channel(struct wiphy *wiphy,
798 enum nl80211_reg_initiator initiator,
799 enum ieee80211_band band,
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800800 unsigned int chan_idx)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700801{
802 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400803 u32 flags, bw_flags = 0;
804 u32 desired_bw_khz = MHZ_TO_KHZ(20);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700805 const struct ieee80211_reg_rule *reg_rule = NULL;
806 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400807 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800808 struct ieee80211_supported_band *sband;
809 struct ieee80211_channel *chan;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500810 struct wiphy *request_wiphy = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800811
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500812 assert_cfg80211_lock();
813
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500814 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
815
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800816 sband = wiphy->bands[band];
817 BUG_ON(chan_idx >= sband->n_channels);
818 chan = &sband->channels[chan_idx];
819
820 flags = chan->orig_flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700821
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400822 r = freq_reg_info(wiphy,
823 MHZ_TO_KHZ(chan->center_freq),
824 desired_bw_khz,
825 &reg_rule);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700826
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700827 if (r) {
828 /*
829 * We will disable all channels that do not match our
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300830 * received regulatory rule unless the hint is coming
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700831 * from a Country IE and the Country IE had no information
832 * about a band. The IEEE 802.11 spec allows for an AP
833 * to send only a subset of the regulatory rules allowed,
834 * so an AP in the US that only supports 2.4 GHz may only send
835 * a country IE with information for the 2.4 GHz band
836 * while 5 GHz is still supported.
837 */
838 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
839 r == -ERANGE)
840 return;
841
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700842 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700843 chan->flags = IEEE80211_CHAN_DISABLED;
Johannes Berg8318d782008-01-24 19:38:38 +0100844 return;
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700845 }
Johannes Berg8318d782008-01-24 19:38:38 +0100846
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530847 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
848
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700849 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400850 freq_range = &reg_rule->freq_range;
851
852 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
853 bw_flags = IEEE80211_CHAN_NO_HT40;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700854
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400855 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500856 request_wiphy && request_wiphy == wiphy &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100857 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500858 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300859 * This guarantees the driver's requested regulatory domain
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800860 * will always be used as a base for further regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500861 * settings
862 */
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800863 chan->flags = chan->orig_flags =
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400864 map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800865 chan->max_antenna_gain = chan->orig_mag =
866 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800867 chan->max_power = chan->orig_mpwr =
868 (int) MBM_TO_DBM(power_rule->max_eirp);
869 return;
870 }
871
Rajkumar Manoharanaa3d7ee2011-09-14 14:28:17 +0530872 chan->beacon_found = false;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400873 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
Johannes Berg8318d782008-01-24 19:38:38 +0100874 chan->max_antenna_gain = min(chan->orig_mag,
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700875 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
Luis R. Rodriguez061acaa2011-12-07 21:50:07 +0530876 if (chan->orig_mpwr) {
877 /*
878 * Devices that have their own custom regulatory domain
879 * but also use WIPHY_FLAG_STRICT_REGULATORY will follow the
880 * passed country IE power settings.
881 */
882 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
883 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
884 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
885 chan->max_power =
886 MBM_TO_DBM(power_rule->max_eirp);
887 } else {
888 chan->max_power = min(chan->orig_mpwr,
889 (int) MBM_TO_DBM(power_rule->max_eirp));
890 }
891 } else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700892 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
Johannes Berg8318d782008-01-24 19:38:38 +0100893}
894
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700895static void handle_band(struct wiphy *wiphy,
896 enum ieee80211_band band,
897 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +0100898{
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800899 unsigned int i;
900 struct ieee80211_supported_band *sband;
901
902 BUG_ON(!wiphy->bands[band]);
903 sband = wiphy->bands[band];
Johannes Berg8318d782008-01-24 19:38:38 +0100904
905 for (i = 0; i < sband->n_channels; i++)
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700906 handle_channel(wiphy, initiator, band, i);
Johannes Berg8318d782008-01-24 19:38:38 +0100907}
908
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400909static bool ignore_reg_update(struct wiphy *wiphy,
910 enum nl80211_reg_initiator initiator)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800911{
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530912 if (!last_request) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700913 REG_DBG_PRINT("Ignoring regulatory request %s since "
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530914 "last_request is not set\n",
915 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800916 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530917 }
918
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400919 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530920 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700921 REG_DBG_PRINT("Ignoring regulatory request %s "
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530922 "since the driver uses its own custom "
Joe Perches12c5ffb2011-07-29 14:51:25 -0700923 "regulatory domain\n",
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530924 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800925 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530926 }
927
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500928 /*
929 * wiphy->regd will be set once the device has its own
930 * desired regulatory domain set
931 */
Johannes Berg5be83de2009-11-19 00:56:28 +0100932 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
Luis R. Rodriguez749b5272010-10-20 10:18:54 -0700933 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530934 !is_world_regdom(last_request->alpha2)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700935 REG_DBG_PRINT("Ignoring regulatory request %s "
Mihai Moldovan5bc91db2011-07-25 11:18:58 +0200936 "since the driver requires its own regulatory "
Joe Perches12c5ffb2011-07-29 14:51:25 -0700937 "domain to be set first\n",
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530938 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800939 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530940 }
941
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800942 return false;
943}
944
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500945static void handle_reg_beacon(struct wiphy *wiphy,
946 unsigned int chan_idx,
947 struct reg_beacon *reg_beacon)
948{
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500949 struct ieee80211_supported_band *sband;
950 struct ieee80211_channel *chan;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400951 bool channel_changed = false;
952 struct ieee80211_channel chan_before;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500953
954 assert_cfg80211_lock();
955
956 sband = wiphy->bands[reg_beacon->chan.band];
957 chan = &sband->channels[chan_idx];
958
959 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
960 return;
961
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400962 if (chan->beacon_found)
963 return;
964
965 chan->beacon_found = true;
966
Johannes Berg5be83de2009-11-19 00:56:28 +0100967 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700968 return;
969
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400970 chan_before.center_freq = chan->center_freq;
971 chan_before.flags = chan->flags;
972
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700973 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500974 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400975 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500976 }
977
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700978 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500979 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400980 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500981 }
982
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400983 if (channel_changed)
984 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500985}
986
987/*
988 * Called when a scan on a wiphy finds a beacon on
989 * new channel
990 */
991static void wiphy_update_new_beacon(struct wiphy *wiphy,
992 struct reg_beacon *reg_beacon)
993{
994 unsigned int i;
995 struct ieee80211_supported_band *sband;
996
997 assert_cfg80211_lock();
998
999 if (!wiphy->bands[reg_beacon->chan.band])
1000 return;
1001
1002 sband = wiphy->bands[reg_beacon->chan.band];
1003
1004 for (i = 0; i < sband->n_channels; i++)
1005 handle_reg_beacon(wiphy, i, reg_beacon);
1006}
1007
1008/*
1009 * Called upon reg changes or a new wiphy is added
1010 */
1011static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1012{
1013 unsigned int i;
1014 struct ieee80211_supported_band *sband;
1015 struct reg_beacon *reg_beacon;
1016
1017 assert_cfg80211_lock();
1018
1019 if (list_empty(&reg_beacon_list))
1020 return;
1021
1022 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1023 if (!wiphy->bands[reg_beacon->chan.band])
1024 continue;
1025 sband = wiphy->bands[reg_beacon->chan.band];
1026 for (i = 0; i < sband->n_channels; i++)
1027 handle_reg_beacon(wiphy, i, reg_beacon);
1028 }
1029}
1030
1031static bool reg_is_world_roaming(struct wiphy *wiphy)
1032{
1033 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1034 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1035 return true;
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -04001036 if (last_request &&
1037 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Johannes Berg5be83de2009-11-19 00:56:28 +01001038 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001039 return true;
1040 return false;
1041}
1042
1043/* Reap the advantages of previously found beacons */
1044static void reg_process_beacons(struct wiphy *wiphy)
1045{
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -04001046 /*
1047 * Means we are just firing up cfg80211, so no beacons would
1048 * have been processed yet.
1049 */
1050 if (!last_request)
1051 return;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001052 if (!reg_is_world_roaming(wiphy))
1053 return;
1054 wiphy_update_beacon_reg(wiphy);
1055}
1056
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001057static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1058{
1059 if (!chan)
1060 return true;
1061 if (chan->flags & IEEE80211_CHAN_DISABLED)
1062 return true;
1063 /* This would happen when regulatory rules disallow HT40 completely */
1064 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1065 return true;
1066 return false;
1067}
1068
1069static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1070 enum ieee80211_band band,
1071 unsigned int chan_idx)
1072{
1073 struct ieee80211_supported_band *sband;
1074 struct ieee80211_channel *channel;
1075 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1076 unsigned int i;
1077
1078 assert_cfg80211_lock();
1079
1080 sband = wiphy->bands[band];
1081 BUG_ON(chan_idx >= sband->n_channels);
1082 channel = &sband->channels[chan_idx];
1083
1084 if (is_ht40_not_allowed(channel)) {
1085 channel->flags |= IEEE80211_CHAN_NO_HT40;
1086 return;
1087 }
1088
1089 /*
1090 * We need to ensure the extension channels exist to
1091 * be able to use HT40- or HT40+, this finds them (or not)
1092 */
1093 for (i = 0; i < sband->n_channels; i++) {
1094 struct ieee80211_channel *c = &sband->channels[i];
1095 if (c->center_freq == (channel->center_freq - 20))
1096 channel_before = c;
1097 if (c->center_freq == (channel->center_freq + 20))
1098 channel_after = c;
1099 }
1100
1101 /*
1102 * Please note that this assumes target bandwidth is 20 MHz,
1103 * if that ever changes we also need to change the below logic
1104 * to include that as well.
1105 */
1106 if (is_ht40_not_allowed(channel_before))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001107 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001108 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001109 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001110
1111 if (is_ht40_not_allowed(channel_after))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001112 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001113 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001114 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001115}
1116
1117static void reg_process_ht_flags_band(struct wiphy *wiphy,
1118 enum ieee80211_band band)
1119{
1120 unsigned int i;
1121 struct ieee80211_supported_band *sband;
1122
1123 BUG_ON(!wiphy->bands[band]);
1124 sband = wiphy->bands[band];
1125
1126 for (i = 0; i < sband->n_channels; i++)
1127 reg_process_ht_flags_channel(wiphy, band, i);
1128}
1129
1130static void reg_process_ht_flags(struct wiphy *wiphy)
1131{
1132 enum ieee80211_band band;
1133
1134 if (!wiphy)
1135 return;
1136
1137 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1138 if (wiphy->bands[band])
1139 reg_process_ht_flags_band(wiphy, band);
1140 }
1141
1142}
1143
Sven Neumanneac03e32011-08-30 23:38:53 +02001144static void wiphy_update_regulatory(struct wiphy *wiphy,
1145 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +01001146{
1147 enum ieee80211_band band;
Luis R. Rodriguezd46e5b12009-01-22 15:05:50 -08001148
Sven Neumanneac03e32011-08-30 23:38:53 +02001149 assert_reg_lock();
1150
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001151 if (ignore_reg_update(wiphy, initiator))
Sven Neumanna203c2a2011-07-12 15:52:07 +02001152 return;
1153
Luis R. Rodriguezb68e6b32011-10-11 10:59:03 -07001154 last_request->dfs_region = cfg80211_regdomain->dfs_region;
1155
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001156 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Johannes Berg8318d782008-01-24 19:38:38 +01001157 if (wiphy->bands[band])
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -07001158 handle_band(wiphy, band, initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001159 }
Sven Neumanna203c2a2011-07-12 15:52:07 +02001160
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001161 reg_process_beacons(wiphy);
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001162 reg_process_ht_flags(wiphy);
Luis R. Rodriguez560e28e2009-01-07 17:43:32 -08001163 if (wiphy->reg_notifier)
Luis R. Rodriguez716f9392009-01-22 15:05:51 -08001164 wiphy->reg_notifier(wiphy, last_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001165}
1166
Sven Neumanneac03e32011-08-30 23:38:53 +02001167void regulatory_update(struct wiphy *wiphy,
1168 enum nl80211_reg_initiator setby)
1169{
1170 mutex_lock(&reg_mutex);
1171 wiphy_update_regulatory(wiphy, setby);
1172 mutex_unlock(&reg_mutex);
1173}
1174
Sven Neumannd7549cb2011-08-30 23:38:54 +02001175static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1176{
1177 struct cfg80211_registered_device *rdev;
Rajkumar Manoharan4a389942011-12-08 23:59:26 +05301178 struct wiphy *wiphy;
Sven Neumannd7549cb2011-08-30 23:38:54 +02001179
Rajkumar Manoharan4a389942011-12-08 23:59:26 +05301180 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1181 wiphy = &rdev->wiphy;
1182 wiphy_update_regulatory(wiphy, initiator);
1183 /*
1184 * Regulatory updates set by CORE are ignored for custom
1185 * regulatory cards. Let us notify the changes to the driver,
1186 * as some drivers used this to restore its orig_* reg domain.
1187 */
1188 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1189 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
1190 wiphy->reg_notifier)
1191 wiphy->reg_notifier(wiphy, last_request);
1192 }
Sven Neumannd7549cb2011-08-30 23:38:54 +02001193}
1194
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001195static void handle_channel_custom(struct wiphy *wiphy,
1196 enum ieee80211_band band,
1197 unsigned int chan_idx,
1198 const struct ieee80211_regdomain *regd)
1199{
1200 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001201 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1202 u32 bw_flags = 0;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001203 const struct ieee80211_reg_rule *reg_rule = NULL;
1204 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001205 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001206 struct ieee80211_supported_band *sband;
1207 struct ieee80211_channel *chan;
1208
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001209 assert_reg_lock();
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001210
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001211 sband = wiphy->bands[band];
1212 BUG_ON(chan_idx >= sband->n_channels);
1213 chan = &sband->channels[chan_idx];
1214
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001215 r = freq_reg_info_regd(wiphy,
1216 MHZ_TO_KHZ(chan->center_freq),
1217 desired_bw_khz,
1218 &reg_rule,
1219 regd);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001220
1221 if (r) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001222 REG_DBG_PRINT("Disabling freq %d MHz as custom "
Luis R. Rodrigueza6518532010-10-20 10:18:57 -07001223 "regd has no rule that fits a %d MHz "
1224 "wide channel\n",
1225 chan->center_freq,
1226 KHZ_TO_MHZ(desired_bw_khz));
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001227 chan->flags = IEEE80211_CHAN_DISABLED;
1228 return;
1229 }
1230
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +05301231 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1232
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001233 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001234 freq_range = &reg_rule->freq_range;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001235
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001236 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1237 bw_flags = IEEE80211_CHAN_NO_HT40;
1238
1239 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001240 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001241 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1242}
1243
1244static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1245 const struct ieee80211_regdomain *regd)
1246{
1247 unsigned int i;
1248 struct ieee80211_supported_band *sband;
1249
1250 BUG_ON(!wiphy->bands[band]);
1251 sband = wiphy->bands[band];
1252
1253 for (i = 0; i < sband->n_channels; i++)
1254 handle_channel_custom(wiphy, band, i, regd);
1255}
1256
1257/* Used by drivers prior to wiphy registration */
1258void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1259 const struct ieee80211_regdomain *regd)
1260{
1261 enum ieee80211_band band;
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001262 unsigned int bands_set = 0;
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001263
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001264 mutex_lock(&reg_mutex);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001265 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001266 if (!wiphy->bands[band])
1267 continue;
1268 handle_band_custom(wiphy, band, regd);
1269 bands_set++;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001270 }
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001271 mutex_unlock(&reg_mutex);
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001272
1273 /*
1274 * no point in calling this if it won't have any effect
1275 * on your device's supportd bands.
1276 */
1277 WARN_ON(!bands_set);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001278}
1279EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1280
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001281/*
1282 * Return value which can be used by ignore_request() to indicate
1283 * it has been determined we should intersect two regulatory domains
1284 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001285#define REG_INTERSECT 1
1286
Johannes Berg84fa4f42008-10-24 20:32:23 +02001287/* This has the logic which determines when a new request
1288 * should be ignored. */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001289static int ignore_request(struct wiphy *wiphy,
1290 struct regulatory_request *pending_request)
Johannes Berg84fa4f42008-10-24 20:32:23 +02001291{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001292 struct wiphy *last_wiphy = NULL;
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001293
1294 assert_cfg80211_lock();
1295
Johannes Berg84fa4f42008-10-24 20:32:23 +02001296 /* All initial requests are respected */
1297 if (!last_request)
1298 return 0;
1299
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001300 switch (pending_request->initiator) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001301 case NL80211_REGDOM_SET_BY_CORE:
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001302 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001303 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001304
1305 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1306
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001307 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001308 return -EINVAL;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001309 if (last_request->initiator ==
1310 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001311 if (last_wiphy != wiphy) {
Johannes Berg84fa4f42008-10-24 20:32:23 +02001312 /*
1313 * Two cards with two APs claiming different
Thadeu Lima de Souza Cascardo1fe90b02009-08-11 11:18:42 -03001314 * Country IE alpha2s. We could
Johannes Berg84fa4f42008-10-24 20:32:23 +02001315 * intersect them, but that seems unlikely
1316 * to be correct. Reject second one for now.
1317 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001318 if (regdom_changes(pending_request->alpha2))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001319 return -EOPNOTSUPP;
1320 return -EALREADY;
1321 }
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001322 /*
1323 * Two consecutive Country IE hints on the same wiphy.
1324 * This should be picked up early by the driver/stack
1325 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001326 if (WARN_ON(regdom_changes(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001327 return 0;
1328 return -EALREADY;
1329 }
Luis R. Rodrigueza171fba2010-10-18 17:44:51 -07001330 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001331 case NL80211_REGDOM_SET_BY_DRIVER:
1332 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001333 if (regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001334 return 0;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001335 return -EALREADY;
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001336 }
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001337
1338 /*
1339 * This would happen if you unplug and plug your card
1340 * back in or if you add a new device for which the previously
1341 * loaded card also agrees on the regulatory domain.
1342 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001343 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001344 !regdom_changes(pending_request->alpha2))
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001345 return -EALREADY;
1346
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001347 return REG_INTERSECT;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001348 case NL80211_REGDOM_SET_BY_USER:
1349 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001350 return REG_INTERSECT;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001351 /*
1352 * If the user knows better the user should set the regdom
1353 * to their country before the IE is picked up
1354 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001355 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001356 last_request->intersect)
1357 return -EOPNOTSUPP;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001358 /*
1359 * Process user requests only after previous user/driver/core
1360 * requests have been processed
1361 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001362 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1363 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1364 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
Luis R. Rodriguez69b15722009-02-21 00:04:33 -05001365 if (regdom_changes(last_request->alpha2))
Luis R. Rodriguez5eebade2009-01-22 15:05:47 -08001366 return -EAGAIN;
1367 }
1368
John W. Linvillebaeb66f2009-12-18 17:59:02 -05001369 if (!regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001370 return -EALREADY;
1371
Johannes Berg84fa4f42008-10-24 20:32:23 +02001372 return 0;
1373 }
1374
1375 return -EINVAL;
1376}
1377
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001378static void reg_set_request_processed(void)
1379{
1380 bool need_more_processing = false;
1381
1382 last_request->processed = true;
1383
1384 spin_lock(&reg_requests_lock);
1385 if (!list_empty(&reg_requests_list))
1386 need_more_processing = true;
1387 spin_unlock(&reg_requests_lock);
1388
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001389 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
1390 cancel_delayed_work_sync(&reg_timeout);
1391
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001392 if (need_more_processing)
1393 schedule_work(&reg_work);
1394}
1395
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001396/**
1397 * __regulatory_hint - hint to the wireless core a regulatory domain
1398 * @wiphy: if the hint comes from country information from an AP, this
1399 * is required to be set to the wiphy that received the information
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001400 * @pending_request: the regulatory request currently being processed
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001401 *
1402 * The Wireless subsystem can use this function to hint to the wireless core
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001403 * what it believes should be the current regulatory domain.
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001404 *
1405 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1406 * already been set or other standard error codes.
1407 *
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001408 * Caller must hold &cfg80211_mutex and &reg_mutex
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001409 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001410static int __regulatory_hint(struct wiphy *wiphy,
1411 struct regulatory_request *pending_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001412{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001413 bool intersect = false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001414 int r = 0;
1415
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001416 assert_cfg80211_lock();
1417
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001418 r = ignore_request(wiphy, pending_request);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001419
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001420 if (r == REG_INTERSECT) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001421 if (pending_request->initiator ==
1422 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001423 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001424 if (r) {
1425 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001426 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001427 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001428 }
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001429 intersect = true;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001430 } else if (r) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001431 /*
1432 * If the regulatory domain being requested by the
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001433 * driver has already been set just copy it to the
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001434 * wiphy
1435 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001436 if (r == -EALREADY &&
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001437 pending_request->initiator ==
1438 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001439 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001440 if (r) {
1441 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001442 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001443 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001444 r = -EALREADY;
1445 goto new_request;
1446 }
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001447 kfree(pending_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001448 return r;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001449 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001450
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001451new_request:
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05001452 if (last_request != &core_request_world)
1453 kfree(last_request);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001454
1455 last_request = pending_request;
1456 last_request->intersect = intersect;
1457
1458 pending_request = NULL;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001459
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001460 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1461 user_alpha2[0] = last_request->alpha2[0];
1462 user_alpha2[1] = last_request->alpha2[1];
1463 }
1464
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001465 /* When r == REG_INTERSECT we do need to call CRDA */
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001466 if (r < 0) {
1467 /*
1468 * Since CRDA will not be called in this case as we already
1469 * have applied the requested regulatory domain before we just
1470 * inform userspace we have processed the request
1471 */
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001472 if (r == -EALREADY) {
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001473 nl80211_send_reg_change_event(last_request);
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001474 reg_set_request_processed();
1475 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001476 return r;
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001477 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001478
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001479 return call_crda(last_request->alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001480}
1481
Luis R. Rodriguez30a548c2009-05-02 01:17:27 -04001482/* This processes *all* regulatory hints */
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001483static void reg_process_hint(struct regulatory_request *reg_request,
1484 enum nl80211_reg_initiator reg_initiator)
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001485{
1486 int r = 0;
1487 struct wiphy *wiphy = NULL;
1488
1489 BUG_ON(!reg_request->alpha2);
1490
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001491 if (wiphy_idx_valid(reg_request->wiphy_idx))
1492 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1493
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001494 if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001495 !wiphy) {
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001496 kfree(reg_request);
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001497 return;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001498 }
1499
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001500 r = __regulatory_hint(wiphy, reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001501 /* This is required so that the orig_* parameters are saved */
Johannes Berg5be83de2009-11-19 00:56:28 +01001502 if (r == -EALREADY && wiphy &&
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001503 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001504 wiphy_update_regulatory(wiphy, reg_initiator);
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001505 return;
1506 }
1507
1508 /*
1509 * We only time out user hints, given that they should be the only
1510 * source of bogus requests.
1511 */
Luis R. Rodriguezc989bb12011-04-25 18:35:48 -07001512 if (r != -EALREADY &&
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001513 reg_initiator == NL80211_REGDOM_SET_BY_USER)
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001514 schedule_delayed_work(&reg_timeout, msecs_to_jiffies(3142));
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001515}
1516
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001517/*
1518 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1519 * Regulatory hints come on a first come first serve basis and we
1520 * must process each one atomically.
1521 */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001522static void reg_process_pending_hints(void)
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001523{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001524 struct regulatory_request *reg_request;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001525
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001526 mutex_lock(&cfg80211_mutex);
1527 mutex_lock(&reg_mutex);
1528
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001529 /* When last_request->processed becomes true this will be rescheduled */
1530 if (last_request && !last_request->processed) {
1531 REG_DBG_PRINT("Pending regulatory request, waiting "
Joe Perches12c5ffb2011-07-29 14:51:25 -07001532 "for it to be processed...\n");
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001533 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001534 }
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001535
1536 spin_lock(&reg_requests_lock);
1537
1538 if (list_empty(&reg_requests_list)) {
1539 spin_unlock(&reg_requests_lock);
1540 goto out;
1541 }
1542
1543 reg_request = list_first_entry(&reg_requests_list,
1544 struct regulatory_request,
1545 list);
1546 list_del_init(&reg_request->list);
1547
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001548 spin_unlock(&reg_requests_lock);
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001549
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001550 reg_process_hint(reg_request, reg_request->initiator);
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001551
1552out:
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001553 mutex_unlock(&reg_mutex);
1554 mutex_unlock(&cfg80211_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001555}
1556
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001557/* Processes beacon hints -- this has nothing to do with country IEs */
1558static void reg_process_pending_beacon_hints(void)
1559{
Johannes Berg79c97e92009-07-07 03:56:12 +02001560 struct cfg80211_registered_device *rdev;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001561 struct reg_beacon *pending_beacon, *tmp;
1562
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001563 /*
1564 * No need to hold the reg_mutex here as we just touch wiphys
1565 * and do not read or access regulatory variables.
1566 */
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001567 mutex_lock(&cfg80211_mutex);
1568
1569 /* This goes through the _pending_ beacon list */
1570 spin_lock_bh(&reg_pending_beacons_lock);
1571
1572 if (list_empty(&reg_pending_beacons)) {
1573 spin_unlock_bh(&reg_pending_beacons_lock);
1574 goto out;
1575 }
1576
1577 list_for_each_entry_safe(pending_beacon, tmp,
1578 &reg_pending_beacons, list) {
1579
1580 list_del_init(&pending_beacon->list);
1581
1582 /* Applies the beacon hint to current wiphys */
Johannes Berg79c97e92009-07-07 03:56:12 +02001583 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1584 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001585
1586 /* Remembers the beacon hint for new wiphys or reg changes */
1587 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1588 }
1589
1590 spin_unlock_bh(&reg_pending_beacons_lock);
1591out:
1592 mutex_unlock(&cfg80211_mutex);
1593}
1594
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001595static void reg_todo(struct work_struct *work)
1596{
1597 reg_process_pending_hints();
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001598 reg_process_pending_beacon_hints();
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001599}
1600
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001601static void queue_regulatory_request(struct regulatory_request *request)
1602{
John W. Linvillec61029c2010-08-05 14:26:24 -04001603 if (isalpha(request->alpha2[0]))
1604 request->alpha2[0] = toupper(request->alpha2[0]);
1605 if (isalpha(request->alpha2[1]))
1606 request->alpha2[1] = toupper(request->alpha2[1]);
1607
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001608 spin_lock(&reg_requests_lock);
1609 list_add_tail(&request->list, &reg_requests_list);
1610 spin_unlock(&reg_requests_lock);
1611
1612 schedule_work(&reg_work);
1613}
1614
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001615/*
1616 * Core regulatory hint -- happens during cfg80211_init()
1617 * and when we restore regulatory settings.
1618 */
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001619static int regulatory_hint_core(const char *alpha2)
1620{
1621 struct regulatory_request *request;
1622
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001623 request = kzalloc(sizeof(struct regulatory_request),
1624 GFP_KERNEL);
1625 if (!request)
1626 return -ENOMEM;
1627
1628 request->alpha2[0] = alpha2[0];
1629 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001630 request->initiator = NL80211_REGDOM_SET_BY_CORE;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001631
Luis R. Rodriguez31e99722010-11-17 21:46:06 -08001632 queue_regulatory_request(request);
Luis R. Rodriguez5078b2e2009-05-13 17:04:42 -04001633
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001634 return 0;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001635}
1636
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001637/* User hints */
1638int regulatory_hint_user(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001639{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001640 struct regulatory_request *request;
1641
Johannes Bergbe3d4812008-10-24 20:32:21 +02001642 BUG_ON(!alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001643
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001644 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1645 if (!request)
1646 return -ENOMEM;
1647
1648 request->wiphy_idx = WIPHY_IDX_STALE;
1649 request->alpha2[0] = alpha2[0];
1650 request->alpha2[1] = alpha2[1];
Luis R. Rodrigueze12822e2010-01-04 11:37:39 -05001651 request->initiator = NL80211_REGDOM_SET_BY_USER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001652
1653 queue_regulatory_request(request);
1654
1655 return 0;
1656}
1657
1658/* Driver hints */
1659int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1660{
1661 struct regulatory_request *request;
1662
1663 BUG_ON(!alpha2);
1664 BUG_ON(!wiphy);
1665
1666 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1667 if (!request)
1668 return -ENOMEM;
1669
1670 request->wiphy_idx = get_wiphy_idx(wiphy);
1671
1672 /* Must have registered wiphy first */
1673 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1674
1675 request->alpha2[0] = alpha2[0];
1676 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001677 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001678
1679 queue_regulatory_request(request);
1680
1681 return 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001682}
1683EXPORT_SYMBOL(regulatory_hint);
1684
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001685/*
1686 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1687 * therefore cannot iterate over the rdev list here.
1688 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001689void regulatory_hint_11d(struct wiphy *wiphy,
Luis R. Rodriguez84920e32010-01-14 20:08:20 -05001690 enum ieee80211_band band,
1691 u8 *country_ie,
1692 u8 country_ie_len)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001693{
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001694 char alpha2[2];
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001695 enum environment_cap env = ENVIRON_ANY;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001696 struct regulatory_request *request;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001697
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001698 mutex_lock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001699
Luis R. Rodriguez9828b012009-07-30 17:38:06 -07001700 if (unlikely(!last_request))
1701 goto out;
Luis R. Rodriguezd335fe62009-02-21 00:04:27 -05001702
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001703 /* IE len must be evenly divisible by 2 */
1704 if (country_ie_len & 0x01)
1705 goto out;
1706
1707 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1708 goto out;
1709
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001710 alpha2[0] = country_ie[0];
1711 alpha2[1] = country_ie[1];
1712
1713 if (country_ie[2] == 'I')
1714 env = ENVIRON_INDOOR;
1715 else if (country_ie[2] == 'O')
1716 env = ENVIRON_OUTDOOR;
1717
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001718 /*
Luis R. Rodriguez8b19e6c2009-07-30 17:38:09 -07001719 * We will run this only upon a successful connection on cfg80211.
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001720 * We leave conflict resolution to the workqueue, where can hold
1721 * cfg80211_mutex.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001722 */
Luis R. Rodriguezcc0b6fe2009-03-20 23:53:05 -04001723 if (likely(last_request->initiator ==
1724 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001725 wiphy_idx_valid(last_request->wiphy_idx)))
1726 goto out;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001727
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001728 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1729 if (!request)
Dan Carpenterf9f9b6e2010-07-22 13:26:50 +02001730 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001731
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001732 request->wiphy_idx = get_wiphy_idx(wiphy);
John W. Linville4f366c52010-07-15 14:57:33 -04001733 request->alpha2[0] = alpha2[0];
1734 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001735 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001736 request->country_ie_env = env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001737
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001738 mutex_unlock(&reg_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001739
1740 queue_regulatory_request(request);
1741
1742 return;
Luis R. Rodriguez0441d6f2009-02-21 00:04:29 -05001743
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001744out:
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001745 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001746}
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001747
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001748static void restore_alpha2(char *alpha2, bool reset_user)
1749{
1750 /* indicates there is no alpha2 to consider for restoration */
1751 alpha2[0] = '9';
1752 alpha2[1] = '7';
1753
1754 /* The user setting has precedence over the module parameter */
1755 if (is_user_regdom_saved()) {
1756 /* Unless we're asked to ignore it and reset it */
1757 if (reset_user) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001758 REG_DBG_PRINT("Restoring regulatory settings "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001759 "including user preference\n");
1760 user_alpha2[0] = '9';
1761 user_alpha2[1] = '7';
1762
1763 /*
1764 * If we're ignoring user settings, we still need to
1765 * check the module parameter to ensure we put things
1766 * back as they were for a full restore.
1767 */
1768 if (!is_world_regdom(ieee80211_regdom)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001769 REG_DBG_PRINT("Keeping preference on "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001770 "module parameter ieee80211_regdom: %c%c\n",
1771 ieee80211_regdom[0],
1772 ieee80211_regdom[1]);
1773 alpha2[0] = ieee80211_regdom[0];
1774 alpha2[1] = ieee80211_regdom[1];
1775 }
1776 } else {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001777 REG_DBG_PRINT("Restoring regulatory settings "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001778 "while preserving user preference for: %c%c\n",
1779 user_alpha2[0],
1780 user_alpha2[1]);
1781 alpha2[0] = user_alpha2[0];
1782 alpha2[1] = user_alpha2[1];
1783 }
1784 } else if (!is_world_regdom(ieee80211_regdom)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001785 REG_DBG_PRINT("Keeping preference on "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001786 "module parameter ieee80211_regdom: %c%c\n",
1787 ieee80211_regdom[0],
1788 ieee80211_regdom[1]);
1789 alpha2[0] = ieee80211_regdom[0];
1790 alpha2[1] = ieee80211_regdom[1];
1791 } else
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001792 REG_DBG_PRINT("Restoring regulatory settings\n");
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001793}
1794
Rajkumar Manoharan5ce543d2011-12-07 21:50:08 +05301795static void restore_custom_reg_settings(struct wiphy *wiphy)
1796{
1797 struct ieee80211_supported_band *sband;
1798 enum ieee80211_band band;
1799 struct ieee80211_channel *chan;
1800 int i;
1801
1802 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1803 sband = wiphy->bands[band];
1804 if (!sband)
1805 continue;
1806 for (i = 0; i < sband->n_channels; i++) {
1807 chan = &sband->channels[i];
1808 chan->flags = chan->orig_flags;
1809 chan->max_antenna_gain = chan->orig_mag;
1810 chan->max_power = chan->orig_mpwr;
1811 }
1812 }
1813}
1814
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001815/*
1816 * Restoring regulatory settings involves ingoring any
1817 * possibly stale country IE information and user regulatory
1818 * settings if so desired, this includes any beacon hints
1819 * learned as we could have traveled outside to another country
1820 * after disconnection. To restore regulatory settings we do
1821 * exactly what we did at bootup:
1822 *
1823 * - send a core regulatory hint
1824 * - send a user regulatory hint if applicable
1825 *
1826 * Device drivers that send a regulatory hint for a specific country
1827 * keep their own regulatory domain on wiphy->regd so that does does
1828 * not need to be remembered.
1829 */
1830static void restore_regulatory_settings(bool reset_user)
1831{
1832 char alpha2[2];
Dmitry Shmidtcee0bec2011-12-19 12:32:21 -08001833 char world_alpha2[2];
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001834 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001835 struct regulatory_request *reg_request, *tmp;
1836 LIST_HEAD(tmp_reg_req_list);
Rajkumar Manoharan5ce543d2011-12-07 21:50:08 +05301837 struct cfg80211_registered_device *rdev;
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001838
1839 mutex_lock(&cfg80211_mutex);
1840 mutex_lock(&reg_mutex);
1841
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05001842 reset_regdomains(true);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001843 restore_alpha2(alpha2, reset_user);
1844
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001845 /*
1846 * If there's any pending requests we simply
1847 * stash them to a temporary pending queue and
1848 * add then after we've restored regulatory
1849 * settings.
1850 */
1851 spin_lock(&reg_requests_lock);
1852 if (!list_empty(&reg_requests_list)) {
1853 list_for_each_entry_safe(reg_request, tmp,
1854 &reg_requests_list, list) {
1855 if (reg_request->initiator !=
1856 NL80211_REGDOM_SET_BY_USER)
1857 continue;
1858 list_del(&reg_request->list);
1859 list_add_tail(&reg_request->list, &tmp_reg_req_list);
1860 }
1861 }
1862 spin_unlock(&reg_requests_lock);
1863
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001864 /* Clear beacon hints */
1865 spin_lock_bh(&reg_pending_beacons_lock);
1866 if (!list_empty(&reg_pending_beacons)) {
1867 list_for_each_entry_safe(reg_beacon, btmp,
1868 &reg_pending_beacons, list) {
1869 list_del(&reg_beacon->list);
1870 kfree(reg_beacon);
1871 }
1872 }
1873 spin_unlock_bh(&reg_pending_beacons_lock);
1874
1875 if (!list_empty(&reg_beacon_list)) {
1876 list_for_each_entry_safe(reg_beacon, btmp,
1877 &reg_beacon_list, list) {
1878 list_del(&reg_beacon->list);
1879 kfree(reg_beacon);
1880 }
1881 }
1882
1883 /* First restore to the basic regulatory settings */
1884 cfg80211_regdomain = cfg80211_world_regdom;
Dmitry Shmidtcee0bec2011-12-19 12:32:21 -08001885 world_alpha2[0] = cfg80211_regdomain->alpha2[0];
1886 world_alpha2[1] = cfg80211_regdomain->alpha2[1];
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001887
Rajkumar Manoharan5ce543d2011-12-07 21:50:08 +05301888 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1889 if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1890 restore_custom_reg_settings(&rdev->wiphy);
1891 }
1892
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001893 mutex_unlock(&reg_mutex);
1894 mutex_unlock(&cfg80211_mutex);
1895
Dmitry Shmidtcee0bec2011-12-19 12:32:21 -08001896 regulatory_hint_core(world_alpha2);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001897
1898 /*
1899 * This restores the ieee80211_regdom module parameter
1900 * preference or the last user requested regulatory
1901 * settings, user regulatory settings takes precedence.
1902 */
1903 if (is_an_alpha2(alpha2))
1904 regulatory_hint_user(user_alpha2);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001905
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001906 if (list_empty(&tmp_reg_req_list))
1907 return;
1908
1909 mutex_lock(&cfg80211_mutex);
1910 mutex_lock(&reg_mutex);
1911
1912 spin_lock(&reg_requests_lock);
1913 list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) {
1914 REG_DBG_PRINT("Adding request for country %c%c back "
1915 "into the queue\n",
1916 reg_request->alpha2[0],
1917 reg_request->alpha2[1]);
1918 list_del(&reg_request->list);
1919 list_add_tail(&reg_request->list, &reg_requests_list);
1920 }
1921 spin_unlock(&reg_requests_lock);
1922
1923 mutex_unlock(&reg_mutex);
1924 mutex_unlock(&cfg80211_mutex);
1925
1926 REG_DBG_PRINT("Kicking the queue\n");
1927
1928 schedule_work(&reg_work);
1929}
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001930
1931void regulatory_hint_disconnect(void)
1932{
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001933 REG_DBG_PRINT("All devices are disconnected, going to "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001934 "restore regulatory settings\n");
1935 restore_regulatory_settings(false);
1936}
1937
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001938static bool freq_is_chan_12_13_14(u16 freq)
1939{
Bruno Randolf59eb21a2011-01-17 13:37:28 +09001940 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
1941 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
1942 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001943 return true;
1944 return false;
1945}
1946
1947int regulatory_hint_found_beacon(struct wiphy *wiphy,
1948 struct ieee80211_channel *beacon_chan,
1949 gfp_t gfp)
1950{
1951 struct reg_beacon *reg_beacon;
1952
1953 if (likely((beacon_chan->beacon_found ||
1954 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1955 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1956 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1957 return 0;
1958
1959 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1960 if (!reg_beacon)
1961 return -ENOMEM;
1962
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001963 REG_DBG_PRINT("Found new beacon on "
Luis R. Rodriguez4113f752010-01-04 11:50:11 -05001964 "frequency: %d MHz (Ch %d) on %s\n",
1965 beacon_chan->center_freq,
1966 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1967 wiphy_name(wiphy));
1968
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001969 memcpy(&reg_beacon->chan, beacon_chan,
1970 sizeof(struct ieee80211_channel));
1971
1972
1973 /*
1974 * Since we can be called from BH or and non-BH context
1975 * we must use spin_lock_bh()
1976 */
1977 spin_lock_bh(&reg_pending_beacons_lock);
1978 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1979 spin_unlock_bh(&reg_pending_beacons_lock);
1980
1981 schedule_work(&reg_work);
1982
1983 return 0;
1984}
1985
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001986static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001987{
1988 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001989 const struct ieee80211_reg_rule *reg_rule = NULL;
1990 const struct ieee80211_freq_range *freq_range = NULL;
1991 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001992
Joe Perchese9c02682010-11-16 19:56:49 -08001993 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001994
1995 for (i = 0; i < rd->n_reg_rules; i++) {
1996 reg_rule = &rd->reg_rules[i];
1997 freq_range = &reg_rule->freq_range;
1998 power_rule = &reg_rule->power_rule;
1999
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002000 /*
2001 * There may not be documentation for max antenna gain
2002 * in certain regions
2003 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002004 if (power_rule->max_antenna_gain)
Joe Perchese9c02682010-11-16 19:56:49 -08002005 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002006 freq_range->start_freq_khz,
2007 freq_range->end_freq_khz,
2008 freq_range->max_bandwidth_khz,
2009 power_rule->max_antenna_gain,
2010 power_rule->max_eirp);
2011 else
Joe Perchese9c02682010-11-16 19:56:49 -08002012 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002013 freq_range->start_freq_khz,
2014 freq_range->end_freq_khz,
2015 freq_range->max_bandwidth_khz,
2016 power_rule->max_eirp);
2017 }
2018}
2019
Luis R. Rodriguez8b60b072011-10-11 10:59:02 -07002020bool reg_supported_dfs_region(u8 dfs_region)
2021{
2022 switch (dfs_region) {
2023 case NL80211_DFS_UNSET:
2024 case NL80211_DFS_FCC:
2025 case NL80211_DFS_ETSI:
2026 case NL80211_DFS_JP:
2027 return true;
2028 default:
2029 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2030 dfs_region);
2031 return false;
2032 }
2033}
2034
2035static void print_dfs_region(u8 dfs_region)
2036{
2037 if (!dfs_region)
2038 return;
2039
2040 switch (dfs_region) {
2041 case NL80211_DFS_FCC:
2042 pr_info(" DFS Master region FCC");
2043 break;
2044 case NL80211_DFS_ETSI:
2045 pr_info(" DFS Master region ETSI");
2046 break;
2047 case NL80211_DFS_JP:
2048 pr_info(" DFS Master region JP");
2049 break;
2050 default:
2051 pr_info(" DFS Master region Uknown");
2052 break;
2053 }
2054}
2055
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002056static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002057{
2058
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002059 if (is_intersected_alpha2(rd->alpha2)) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002060
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002061 if (last_request->initiator ==
2062 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Johannes Berg79c97e92009-07-07 03:56:12 +02002063 struct cfg80211_registered_device *rdev;
2064 rdev = cfg80211_rdev_by_wiphy_idx(
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002065 last_request->wiphy_idx);
Johannes Berg79c97e92009-07-07 03:56:12 +02002066 if (rdev) {
Joe Perchese9c02682010-11-16 19:56:49 -08002067 pr_info("Current regulatory domain updated by AP to: %c%c\n",
Johannes Berg79c97e92009-07-07 03:56:12 +02002068 rdev->country_ie_alpha2[0],
2069 rdev->country_ie_alpha2[1]);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002070 } else
Joe Perchese9c02682010-11-16 19:56:49 -08002071 pr_info("Current regulatory domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002072 } else
Joe Perchese9c02682010-11-16 19:56:49 -08002073 pr_info("Current regulatory domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002074 } else if (is_world_regdom(rd->alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -08002075 pr_info("World regulatory domain updated:\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002076 else {
2077 if (is_unknown_alpha2(rd->alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -08002078 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002079 else
Joe Perchese9c02682010-11-16 19:56:49 -08002080 pr_info("Regulatory domain changed to country: %c%c\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002081 rd->alpha2[0], rd->alpha2[1]);
2082 }
Luis R. Rodriguez8b60b072011-10-11 10:59:02 -07002083 print_dfs_region(rd->dfs_region);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002084 print_rd_rules(rd);
2085}
2086
Johannes Berg2df78162008-10-28 16:49:41 +01002087static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002088{
Joe Perchese9c02682010-11-16 19:56:49 -08002089 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002090 print_rd_rules(rd);
2091}
2092
Johannes Bergd2372b32008-10-24 20:32:20 +02002093/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002094static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002095{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002096 const struct ieee80211_regdomain *intersected_rd = NULL;
Johannes Berg79c97e92009-07-07 03:56:12 +02002097 struct cfg80211_registered_device *rdev = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002098 struct wiphy *request_wiphy;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002099 /* Some basic sanity checks first */
2100
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002101 if (is_world_regdom(rd->alpha2)) {
Johannes Bergf6037d02008-10-21 11:01:33 +02002102 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002103 return -EINVAL;
2104 update_world_regdomain(rd);
2105 return 0;
2106 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002107
2108 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
2109 !is_unknown_alpha2(rd->alpha2))
2110 return -EINVAL;
2111
Johannes Bergf6037d02008-10-21 11:01:33 +02002112 if (!last_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002113 return -EINVAL;
2114
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002115 /*
2116 * Lets only bother proceeding on the same alpha2 if the current
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002117 * rd is non static (it means CRDA was present and was used last)
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002118 * and the pending request came in from a country IE
2119 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002120 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002121 /*
2122 * If someone else asked us to change the rd lets only bother
2123 * checking if the alpha2 changes if CRDA was already called
2124 */
John W. Linvillebaeb66f2009-12-18 17:59:02 -05002125 if (!regdom_changes(rd->alpha2))
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002126 return -EINVAL;
2127 }
2128
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002129 /*
2130 * Now lets set the regulatory domain, update all driver channels
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002131 * and finally inform them of what we have done, in case they want
2132 * to review or adjust their own settings based on their own
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002133 * internal EEPROM data
2134 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002135
Johannes Bergf6037d02008-10-21 11:01:33 +02002136 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002137 return -EINVAL;
2138
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08002139 if (!is_valid_rd(rd)) {
Joe Perchese9c02682010-11-16 19:56:49 -08002140 pr_err("Invalid regulatory domain detected:\n");
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08002141 print_regdomain_info(rd);
2142 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002143 }
2144
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002145 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
Luis R. Rodriguez0bac71a2011-11-28 16:47:16 -05002146 if (!request_wiphy &&
2147 (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2148 last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) {
2149 schedule_delayed_work(&reg_timeout, 0);
Johannes Bergde3584b2011-11-21 10:44:00 +01002150 return -ENODEV;
2151 }
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002152
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002153 if (!last_request->intersect) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002154 int r;
2155
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002156 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05002157 reset_regdomains(false);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002158 cfg80211_regdomain = rd;
2159 return 0;
2160 }
2161
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002162 /*
2163 * For a driver hint, lets copy the regulatory domain the
2164 * driver wanted to the wiphy to deal with conflicts
2165 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002166
Luis R. Rodriguez558f6d32009-06-08 18:54:37 -07002167 /*
2168 * Userspace could have sent two replies with only
2169 * one kernel request.
2170 */
2171 if (request_wiphy->regd)
2172 return -EALREADY;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002173
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002174 r = reg_copy_regd(&request_wiphy->regd, rd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002175 if (r)
2176 return r;
2177
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05002178 reset_regdomains(false);
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002179 cfg80211_regdomain = rd;
2180 return 0;
2181 }
2182
2183 /* Intersection requires a bit more work */
2184
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002185 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002186
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002187 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2188 if (!intersected_rd)
2189 return -EINVAL;
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002190
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002191 /*
2192 * We can trash what CRDA provided now.
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002193 * However if a driver requested this specific regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002194 * domain we keep it for its private use
2195 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002196 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002197 request_wiphy->regd = rd;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002198 else
2199 kfree(rd);
2200
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002201 rd = NULL;
2202
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05002203 reset_regdomains(false);
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002204 cfg80211_regdomain = intersected_rd;
2205
2206 return 0;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002207 }
2208
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002209 if (!intersected_rd)
2210 return -EINVAL;
2211
Johannes Berg79c97e92009-07-07 03:56:12 +02002212 rdev = wiphy_to_dev(request_wiphy);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002213
Johannes Berg79c97e92009-07-07 03:56:12 +02002214 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2215 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2216 rdev->env = last_request->country_ie_env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002217
2218 BUG_ON(intersected_rd == rd);
2219
2220 kfree(rd);
2221 rd = NULL;
2222
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05002223 reset_regdomains(false);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002224 cfg80211_regdomain = intersected_rd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002225
2226 return 0;
2227}
2228
2229
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002230/*
2231 * Use this call to set the current regulatory domain. Conflicts with
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002232 * multiple drivers can be ironed out later. Caller must've already
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002233 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2234 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002235int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002236{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002237 int r;
2238
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05002239 assert_cfg80211_lock();
2240
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002241 mutex_lock(&reg_mutex);
2242
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002243 /* Note that this doesn't update the wiphys, this is done below */
2244 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +02002245 if (r) {
2246 kfree(rd);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002247 mutex_unlock(&reg_mutex);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002248 return r;
Johannes Bergd2372b32008-10-24 20:32:20 +02002249 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002250
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002251 /* This would make this whole thing pointless */
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08002252 if (!last_request->intersect)
2253 BUG_ON(rd != cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002254
2255 /* update all wiphys now with the new established regulatory domain */
Johannes Bergf6037d02008-10-21 11:01:33 +02002256 update_all_wiphy_regulatory(last_request->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002257
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08002258 print_regdomain(cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002259
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04002260 nl80211_send_reg_change_event(last_request);
2261
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08002262 reg_set_request_processed();
2263
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002264 mutex_unlock(&reg_mutex);
2265
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002266 return r;
2267}
2268
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002269#ifdef CONFIG_HOTPLUG
2270int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2271{
2272 if (last_request && !last_request->processed) {
2273 if (add_uevent_var(env, "COUNTRY=%c%c",
2274 last_request->alpha2[0],
2275 last_request->alpha2[1]))
2276 return -ENOMEM;
2277 }
2278
2279 return 0;
2280}
2281#else
2282int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2283{
2284 return -ENODEV;
2285}
2286#endif /* CONFIG_HOTPLUG */
2287
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002288/* Caller must hold cfg80211_mutex */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002289void reg_device_remove(struct wiphy *wiphy)
2290{
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04002291 struct wiphy *request_wiphy = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002292
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05002293 assert_cfg80211_lock();
2294
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002295 mutex_lock(&reg_mutex);
2296
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002297 kfree(wiphy->regd);
2298
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04002299 if (last_request)
2300 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002301
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002302 if (!request_wiphy || request_wiphy != wiphy)
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002303 goto out;
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002304
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002305 last_request->wiphy_idx = WIPHY_IDX_STALE;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002306 last_request->country_ie_env = ENVIRON_ANY;
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002307out:
2308 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002309}
2310
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002311static void reg_timeout_work(struct work_struct *work)
2312{
2313 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "
Joe Perches12c5ffb2011-07-29 14:51:25 -07002314 "restoring regulatory settings\n");
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002315 restore_regulatory_settings(true);
2316}
2317
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002318int __init regulatory_init(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002319{
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002320 int err = 0;
Johannes Berg734366d2008-09-15 10:56:48 +02002321
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002322 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2323 if (IS_ERR(reg_pdev))
2324 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002325
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002326 reg_pdev->dev.type = &reg_device_type;
2327
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002328 spin_lock_init(&reg_requests_lock);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002329 spin_lock_init(&reg_pending_beacons_lock);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002330
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002331 cfg80211_regdomain = cfg80211_world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +02002332
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05002333 user_alpha2[0] = '9';
2334 user_alpha2[1] = '7';
2335
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002336 /* We always try to get an update for the static regdomain */
2337 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002338 if (err) {
2339 if (err == -ENOMEM)
2340 return err;
2341 /*
2342 * N.B. kobject_uevent_env() can fail mainly for when we're out
2343 * memory which is handled and propagated appropriately above
2344 * but it can also fail during a netlink_broadcast() or during
2345 * early boot for call_usermodehelper(). For now treat these
2346 * errors as non-fatal.
2347 */
Joe Perchese9c02682010-11-16 19:56:49 -08002348 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002349#ifdef CONFIG_CFG80211_REG_DEBUG
2350 /* We want to find out exactly why when debugging */
2351 WARN_ON(err);
2352#endif
2353 }
Johannes Berg734366d2008-09-15 10:56:48 +02002354
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002355 /*
2356 * Finally, if the user set the module parameter treat it
2357 * as a user hint.
2358 */
2359 if (!is_world_regdom(ieee80211_regdom))
2360 regulatory_hint_user(ieee80211_regdom);
2361
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002362 return 0;
2363}
2364
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002365void /* __init_or_exit */ regulatory_exit(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002366{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002367 struct regulatory_request *reg_request, *tmp;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002368 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002369
2370 cancel_work_sync(&reg_work);
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002371 cancel_delayed_work_sync(&reg_timeout);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002372
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002373 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002374 mutex_lock(&reg_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +02002375
Luis R. Rodrigueza0429942011-11-28 16:47:15 -05002376 reset_regdomains(true);
Johannes Berg734366d2008-09-15 10:56:48 +02002377
Luis R. Rodriguez58ebacc2011-11-08 14:28:06 -08002378 dev_set_uevent_suppress(&reg_pdev->dev, true);
Johannes Bergf6037d02008-10-21 11:01:33 +02002379
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002380 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002381
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002382 spin_lock_bh(&reg_pending_beacons_lock);
2383 if (!list_empty(&reg_pending_beacons)) {
2384 list_for_each_entry_safe(reg_beacon, btmp,
2385 &reg_pending_beacons, list) {
2386 list_del(&reg_beacon->list);
2387 kfree(reg_beacon);
2388 }
2389 }
2390 spin_unlock_bh(&reg_pending_beacons_lock);
2391
2392 if (!list_empty(&reg_beacon_list)) {
2393 list_for_each_entry_safe(reg_beacon, btmp,
2394 &reg_beacon_list, list) {
2395 list_del(&reg_beacon->list);
2396 kfree(reg_beacon);
2397 }
2398 }
2399
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002400 spin_lock(&reg_requests_lock);
2401 if (!list_empty(&reg_requests_list)) {
2402 list_for_each_entry_safe(reg_request, tmp,
2403 &reg_requests_list, list) {
2404 list_del(&reg_request->list);
2405 kfree(reg_request);
2406 }
2407 }
2408 spin_unlock(&reg_requests_lock);
2409
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002410 mutex_unlock(&reg_mutex);
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002411 mutex_unlock(&cfg80211_mutex);
Johannes Berg8318d782008-01-24 19:38:38 +01002412}