blob: 2193f62bb8aef75d8795b6e9f2e4f583f85465a6 [file] [log] [blame]
Johannes Berg8318d782008-01-24 19:38:38 +01001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
Luis R. Rodriguez3b77d5e2011-12-20 12:23:38 -08005 * Copyright 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Johannes Berg8318d782008-01-24 19:38:38 +01006 *
Luis R. Rodriguez3b77d5e2011-12-20 12:23:38 -08007 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Johannes Berg8318d782008-01-24 19:38:38 +010018 */
19
Luis R. Rodriguez3b77d5e2011-12-20 12:23:38 -080020
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070021/**
22 * DOC: Wireless regulatory infrastructure
Johannes Berg8318d782008-01-24 19:38:38 +010023 *
24 * The usual implementation is for a driver to read a device EEPROM to
25 * determine which regulatory domain it should be operating under, then
26 * looking up the allowable channels in a driver-local table and finally
27 * registering those channels in the wiphy structure.
28 *
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070029 * Another set of compliance enforcement is for drivers to use their
30 * own compliance limits which can be stored on the EEPROM. The host
31 * driver or firmware may ensure these are used.
32 *
33 * In addition to all this we provide an extra layer of regulatory
34 * conformance. For drivers which do not have any regulatory
35 * information CRDA provides the complete regulatory solution.
36 * For others it provides a community effort on further restrictions
37 * to enhance compliance.
38 *
39 * Note: When number of rules --> infinity we will not be able to
40 * index on alpha2 any more, instead we'll probably have to
41 * rely on some SHA1 checksum of the regdomain for example.
42 *
Johannes Berg8318d782008-01-24 19:38:38 +010043 */
Joe Perchese9c02682010-11-16 19:56:49 -080044
45#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46
Johannes Berg8318d782008-01-24 19:38:38 +010047#include <linux/kernel.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040048#include <linux/export.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090049#include <linux/slab.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070050#include <linux/list.h>
John W. Linvillec61029c2010-08-05 14:26:24 -040051#include <linux/ctype.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070052#include <linux/nl80211.h>
53#include <linux/platform_device.h>
Paul Gortmakerd9b93842011-09-18 13:21:27 -040054#include <linux/moduleparam.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070055#include <net/cfg80211.h>
Johannes Berg8318d782008-01-24 19:38:38 +010056#include "core.h"
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070057#include "reg.h"
John W. Linville3b377ea2009-12-18 17:59:01 -050058#include "regdb.h"
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -040059#include "nl80211.h"
Johannes Berg8318d782008-01-24 19:38:38 +010060
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050061#ifdef CONFIG_CFG80211_REG_DEBUG
Joe Perches12c5ffb2011-07-29 14:51:25 -070062#define REG_DBG_PRINT(format, args...) \
63 printk(KERN_DEBUG pr_fmt(format), ##args)
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050064#else
John W. Linville82711952010-01-05 17:57:20 -050065#define REG_DBG_PRINT(args...)
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050066#endif
67
Johannes Berg2f922122012-12-03 17:54:55 +010068enum reg_request_treatment {
69 REG_REQ_OK,
70 REG_REQ_IGNORE,
71 REG_REQ_INTERSECT,
72 REG_REQ_ALREADY_SET,
73};
74
Luis R. Rodrigueza0429942011-11-28 16:47:15 -050075static struct regulatory_request core_request_world = {
76 .initiator = NL80211_REGDOM_SET_BY_CORE,
77 .alpha2[0] = '0',
78 .alpha2[1] = '0',
79 .intersect = false,
80 .processed = true,
81 .country_ie_env = ENVIRON_ANY,
82};
83
Luis R. Rodriguez5166ccd2008-10-30 13:33:56 -070084/* Receipt of information from last regulatory request */
Johannes Bergc492db32012-12-06 16:29:25 +010085static struct regulatory_request __rcu *last_request =
86 (void __rcu *)&core_request_world;
Johannes Berg734366d2008-09-15 10:56:48 +020087
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070088/* To trigger userspace events */
89static struct platform_device *reg_pdev;
Johannes Berg8318d782008-01-24 19:38:38 +010090
Scott James Remnant4d9d88d2011-03-08 10:45:30 -080091static struct device_type reg_device_type = {
92 .uevent = reg_device_uevent,
93};
94
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050095/*
96 * Central wireless core regulatory domains, we only need two,
Johannes Berg734366d2008-09-15 10:56:48 +020097 * the current one and a world regulatory domain in case we have no
Johannes Berge8da2bb2012-12-03 23:00:08 +010098 * information to give us an alpha2.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050099 */
Johannes Berg458f4f92012-12-06 15:47:38 +0100100const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +0200101
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500102/*
Luis R. Rodriguezabc73812009-07-30 17:38:08 -0700103 * Protects static reg.c components:
Johannes Berg458f4f92012-12-06 15:47:38 +0100104 * - cfg80211_regdomain (if not used with RCU)
105 * - cfg80211_world_regdom
Johannes Bergc492db32012-12-06 16:29:25 +0100106 * - last_request (if not used with RCU)
Johannes Berg458f4f92012-12-06 15:47:38 +0100107 * - reg_num_devs_support_basehint
Luis R. Rodriguezabc73812009-07-30 17:38:08 -0700108 */
John W. Linville670b7f12010-06-24 11:26:31 -0400109static DEFINE_MUTEX(reg_mutex);
Johannes Berg46a5eba2010-09-15 13:28:15 +0200110
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700111/*
112 * Number of devices that registered to the core
113 * that support cellular base station regulatory hints
114 */
115static int reg_num_devs_support_basehint;
116
Johannes Berg46a5eba2010-09-15 13:28:15 +0200117static inline void assert_reg_lock(void)
118{
119 lockdep_assert_held(&reg_mutex);
120}
Luis R. Rodriguezabc73812009-07-30 17:38:08 -0700121
Johannes Berg458f4f92012-12-06 15:47:38 +0100122static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
123{
124 return rcu_dereference_protected(cfg80211_regdomain,
125 lockdep_is_held(&reg_mutex));
126}
127
128static const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
129{
130 return rcu_dereference_protected(wiphy->regd,
131 lockdep_is_held(&reg_mutex));
132}
133
134static void rcu_free_regdom(const struct ieee80211_regdomain *r)
135{
136 if (!r)
137 return;
138 kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
139}
140
Johannes Bergc492db32012-12-06 16:29:25 +0100141static struct regulatory_request *get_last_request(void)
142{
Johannes Berg4a484cf2013-01-09 10:22:07 +0100143 return rcu_dereference_check(last_request,
144 lockdep_is_held(&reg_mutex));
Johannes Bergc492db32012-12-06 16:29:25 +0100145}
146
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500147/* Used to queue up regulatory hints */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500148static LIST_HEAD(reg_requests_list);
149static spinlock_t reg_requests_lock;
150
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500151/* Used to queue up beacon hints for review */
152static LIST_HEAD(reg_pending_beacons);
153static spinlock_t reg_pending_beacons_lock;
154
155/* Used to keep track of processed beacon hints */
156static LIST_HEAD(reg_beacon_list);
157
158struct reg_beacon {
159 struct list_head list;
160 struct ieee80211_channel chan;
161};
162
Luis R. Rodriguezf333a7a2010-11-17 21:46:07 -0800163static void reg_todo(struct work_struct *work);
164static DECLARE_WORK(reg_work, reg_todo);
165
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -0700166static void reg_timeout_work(struct work_struct *work);
167static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
168
Johannes Berg734366d2008-09-15 10:56:48 +0200169/* We keep a static world regulatory domain in case of the absence of CRDA */
170static const struct ieee80211_regdomain world_regdom = {
Vladimir Kondratiev90cdc6d2012-07-02 09:32:34 +0300171 .n_reg_rules = 6,
Johannes Berg734366d2008-09-15 10:56:48 +0200172 .alpha2 = "00",
173 .reg_rules = {
Luis R. Rodriguez68798a62009-02-21 00:20:37 -0500174 /* IEEE 802.11b/g, channels 1..11 */
175 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
Johannes Berg43c771a2012-11-12 10:51:34 +0100176 /* IEEE 802.11b/g, channels 12..13. */
177 REG_RULE(2467-10, 2472+10, 40, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500178 NL80211_RRF_PASSIVE_SCAN |
179 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800180 /* IEEE 802.11 channel 14 - Only JP enables
181 * this and for 802.11b only */
182 REG_RULE(2484-10, 2484+10, 20, 6, 20,
183 NL80211_RRF_PASSIVE_SCAN |
184 NL80211_RRF_NO_IBSS |
185 NL80211_RRF_NO_OFDM),
186 /* IEEE 802.11a, channel 36..48 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800187 REG_RULE(5180-10, 5240+10, 40, 6, 20,
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800188 NL80211_RRF_PASSIVE_SCAN |
189 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500190
191 /* NB: 5260 MHz - 5700 MHz requies DFS */
192
193 /* IEEE 802.11a, channel 149..165 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800194 REG_RULE(5745-10, 5825+10, 40, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500195 NL80211_RRF_PASSIVE_SCAN |
196 NL80211_RRF_NO_IBSS),
Vladimir Kondratiev90cdc6d2012-07-02 09:32:34 +0300197
198 /* IEEE 802.11ad (60gHz), channels 1..3 */
199 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
Johannes Berg734366d2008-09-15 10:56:48 +0200200 }
201};
202
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200203static const struct ieee80211_regdomain *cfg80211_world_regdom =
204 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200205
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400206static char *ieee80211_regdom = "00";
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500207static char user_alpha2[2];
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400208
Johannes Berg734366d2008-09-15 10:56:48 +0200209module_param(ieee80211_regdom, charp, 0444);
210MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
211
Johannes Berg379b82f2012-12-06 15:44:07 +0100212static void reset_regdomains(bool full_reset,
213 const struct ieee80211_regdomain *new_regdom)
Johannes Berg734366d2008-09-15 10:56:48 +0200214{
Johannes Berg458f4f92012-12-06 15:47:38 +0100215 const struct ieee80211_regdomain *r;
Johannes Bergc492db32012-12-06 16:29:25 +0100216 struct regulatory_request *lr;
Johannes Berg458f4f92012-12-06 15:47:38 +0100217
Johannes Berge8da2bb2012-12-03 23:00:08 +0100218 assert_reg_lock();
219
Johannes Berg458f4f92012-12-06 15:47:38 +0100220 r = get_cfg80211_regdom();
221
Johannes Berg942b25c2008-09-15 11:26:47 +0200222 /* avoid freeing static information or freeing something twice */
Johannes Berg458f4f92012-12-06 15:47:38 +0100223 if (r == cfg80211_world_regdom)
224 r = NULL;
Johannes Berg942b25c2008-09-15 11:26:47 +0200225 if (cfg80211_world_regdom == &world_regdom)
226 cfg80211_world_regdom = NULL;
Johannes Berg458f4f92012-12-06 15:47:38 +0100227 if (r == &world_regdom)
228 r = NULL;
Johannes Berg942b25c2008-09-15 11:26:47 +0200229
Johannes Berg458f4f92012-12-06 15:47:38 +0100230 rcu_free_regdom(r);
231 rcu_free_regdom(cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200232
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200233 cfg80211_world_regdom = &world_regdom;
Johannes Berg458f4f92012-12-06 15:47:38 +0100234 rcu_assign_pointer(cfg80211_regdomain, new_regdom);
Luis R. Rodrigueza0429942011-11-28 16:47:15 -0500235
236 if (!full_reset)
237 return;
238
Johannes Bergc492db32012-12-06 16:29:25 +0100239 lr = get_last_request();
240 if (lr != &core_request_world && lr)
241 kfree_rcu(lr, rcu_head);
242 rcu_assign_pointer(last_request, &core_request_world);
Johannes Berg734366d2008-09-15 10:56:48 +0200243}
244
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500245/*
246 * Dynamic world regulatory domain requested by the wireless
247 * core upon initialization
248 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200249static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200250{
Johannes Bergc492db32012-12-06 16:29:25 +0100251 struct regulatory_request *lr;
Johannes Berg734366d2008-09-15 10:56:48 +0200252
Johannes Bergc492db32012-12-06 16:29:25 +0100253 lr = get_last_request();
254
255 WARN_ON(!lr);
Johannes Berge8da2bb2012-12-03 23:00:08 +0100256
Johannes Berg379b82f2012-12-06 15:44:07 +0100257 reset_regdomains(false, rd);
Johannes Berg734366d2008-09-15 10:56:48 +0200258
259 cfg80211_world_regdom = rd;
Johannes Berg734366d2008-09-15 10:56:48 +0200260}
Johannes Berg734366d2008-09-15 10:56:48 +0200261
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200262bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100263{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700264 if (!alpha2)
265 return false;
Johannes Berg1a919312012-12-03 17:21:11 +0100266 return alpha2[0] == '0' && alpha2[1] == '0';
Johannes Berg8318d782008-01-24 19:38:38 +0100267}
268
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200269static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700270{
271 if (!alpha2)
272 return false;
Johannes Berg1a919312012-12-03 17:21:11 +0100273 return alpha2[0] && alpha2[1];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700274}
Johannes Berg8318d782008-01-24 19:38:38 +0100275
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200276static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700277{
278 if (!alpha2)
279 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500280 /*
281 * Special case where regulatory domain was built by driver
282 * but a specific alpha2 cannot be determined
283 */
Johannes Berg1a919312012-12-03 17:21:11 +0100284 return alpha2[0] == '9' && alpha2[1] == '9';
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700285}
286
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800287static bool is_intersected_alpha2(const char *alpha2)
288{
289 if (!alpha2)
290 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500291 /*
292 * Special case where regulatory domain is the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800293 * result of an intersection between two regulatory domain
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500294 * structures
295 */
Johannes Berg1a919312012-12-03 17:21:11 +0100296 return alpha2[0] == '9' && alpha2[1] == '8';
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800297}
298
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200299static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700300{
301 if (!alpha2)
302 return false;
Johannes Berg1a919312012-12-03 17:21:11 +0100303 return isalpha(alpha2[0]) && isalpha(alpha2[1]);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700304}
305
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200306static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700307{
308 if (!alpha2_x || !alpha2_y)
309 return false;
Johannes Berg1a919312012-12-03 17:21:11 +0100310 return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700311}
312
Luis R. Rodriguez69b15722009-02-21 00:04:33 -0500313static bool regdom_changes(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700314{
Johannes Berg458f4f92012-12-06 15:47:38 +0100315 const struct ieee80211_regdomain *r = get_cfg80211_regdom();
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500316
Johannes Berg458f4f92012-12-06 15:47:38 +0100317 if (!r)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700318 return true;
Johannes Berg458f4f92012-12-06 15:47:38 +0100319 return !alpha2_equal(r->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700320}
321
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500322/*
323 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
324 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
325 * has ever been issued.
326 */
327static bool is_user_regdom_saved(void)
328{
329 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
330 return false;
331
332 /* This would indicate a mistake on the design */
Johannes Berg1a919312012-12-03 17:21:11 +0100333 if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500334 "Unexpected user alpha2: %c%c\n",
Johannes Berg1a919312012-12-03 17:21:11 +0100335 user_alpha2[0], user_alpha2[1]))
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500336 return false;
337
338 return true;
339}
340
Johannes Berge9763c32012-12-03 16:59:46 +0100341static const struct ieee80211_regdomain *
342reg_copy_regd(const struct ieee80211_regdomain *src_regd)
John W. Linville3b377ea2009-12-18 17:59:01 -0500343{
344 struct ieee80211_regdomain *regd;
Johannes Berge9763c32012-12-03 16:59:46 +0100345 int size_of_regd;
John W. Linville3b377ea2009-12-18 17:59:01 -0500346 unsigned int i;
347
Johannes Berg82f20852012-12-04 12:49:16 +0100348 size_of_regd =
349 sizeof(struct ieee80211_regdomain) +
350 src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
John W. Linville3b377ea2009-12-18 17:59:01 -0500351
352 regd = kzalloc(size_of_regd, GFP_KERNEL);
353 if (!regd)
Johannes Berge9763c32012-12-03 16:59:46 +0100354 return ERR_PTR(-ENOMEM);
John W. Linville3b377ea2009-12-18 17:59:01 -0500355
356 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
357
358 for (i = 0; i < src_regd->n_reg_rules; i++)
359 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
Johannes Berge9763c32012-12-03 16:59:46 +0100360 sizeof(struct ieee80211_reg_rule));
John W. Linville3b377ea2009-12-18 17:59:01 -0500361
Johannes Berge9763c32012-12-03 16:59:46 +0100362 return regd;
John W. Linville3b377ea2009-12-18 17:59:01 -0500363}
364
365#ifdef CONFIG_CFG80211_INTERNAL_REGDB
366struct reg_regdb_search_request {
367 char alpha2[2];
368 struct list_head list;
369};
370
371static LIST_HEAD(reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400372static DEFINE_MUTEX(reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500373
374static void reg_regdb_search(struct work_struct *work)
375{
376 struct reg_regdb_search_request *request;
Johannes Berge9763c32012-12-03 16:59:46 +0100377 const struct ieee80211_regdomain *curdom, *regdom = NULL;
378 int i;
Luis R. Rodrigueza85d0d72012-09-14 15:36:57 -0700379
380 mutex_lock(&cfg80211_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500381
John W. Linville368d06f2010-03-16 15:40:59 -0400382 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500383 while (!list_empty(&reg_regdb_search_list)) {
384 request = list_first_entry(&reg_regdb_search_list,
385 struct reg_regdb_search_request,
386 list);
387 list_del(&request->list);
388
Johannes Berg1a919312012-12-03 17:21:11 +0100389 for (i = 0; i < reg_regdb_size; i++) {
John W. Linville3b377ea2009-12-18 17:59:01 -0500390 curdom = reg_regdb[i];
391
Johannes Berg1a919312012-12-03 17:21:11 +0100392 if (alpha2_equal(request->alpha2, curdom->alpha2)) {
Johannes Berge9763c32012-12-03 16:59:46 +0100393 regdom = reg_copy_regd(curdom);
John W. Linville3b377ea2009-12-18 17:59:01 -0500394 break;
395 }
396 }
397
398 kfree(request);
399 }
John W. Linville368d06f2010-03-16 15:40:59 -0400400 mutex_unlock(&reg_regdb_search_mutex);
Luis R. Rodrigueza85d0d72012-09-14 15:36:57 -0700401
Johannes Berge9763c32012-12-03 16:59:46 +0100402 if (!IS_ERR_OR_NULL(regdom))
Luis R. Rodrigueza85d0d72012-09-14 15:36:57 -0700403 set_regdom(regdom);
404
405 mutex_unlock(&cfg80211_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500406}
407
408static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
409
410static void reg_regdb_query(const char *alpha2)
411{
412 struct reg_regdb_search_request *request;
413
414 if (!alpha2)
415 return;
416
417 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
418 if (!request)
419 return;
420
421 memcpy(request->alpha2, alpha2, 2);
422
John W. Linville368d06f2010-03-16 15:40:59 -0400423 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500424 list_add_tail(&request->list, &reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400425 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500426
427 schedule_work(&reg_regdb_work);
428}
Luis R. Rodriguez80007ef2012-03-23 07:23:31 -0700429
430/* Feel free to add any other sanity checks here */
431static void reg_regdb_size_check(void)
432{
433 /* We should ideally BUILD_BUG_ON() but then random builds would fail */
434 WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
435}
John W. Linville3b377ea2009-12-18 17:59:01 -0500436#else
Luis R. Rodriguez80007ef2012-03-23 07:23:31 -0700437static inline void reg_regdb_size_check(void) {}
John W. Linville3b377ea2009-12-18 17:59:01 -0500438static inline void reg_regdb_query(const char *alpha2) {}
439#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
440
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500441/*
442 * This lets us keep regulatory code which is updated on a regulatory
Scott James Remnant4d9d88d2011-03-08 10:45:30 -0800443 * basis in userspace. Country information is filled in by
444 * reg_device_uevent
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500445 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700446static int call_crda(const char *alpha2)
447{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700448 if (!is_world_regdom((char *) alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -0800449 pr_info("Calling CRDA for country: %c%c\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700450 alpha2[0], alpha2[1]);
451 else
Joe Perchese9c02682010-11-16 19:56:49 -0800452 pr_info("Calling CRDA to update world regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700453
John W. Linville3b377ea2009-12-18 17:59:01 -0500454 /* query internal regulatory database (if it exists) */
455 reg_regdb_query(alpha2);
456
Scott James Remnant4d9d88d2011-03-08 10:45:30 -0800457 return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700458}
459
Johannes Berg6913b492012-12-04 00:48:59 +0100460static bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700461{
Johannes Bergc492db32012-12-06 16:29:25 +0100462 struct regulatory_request *lr = get_last_request();
Johannes Berg6913b492012-12-04 00:48:59 +0100463
Johannes Bergc492db32012-12-06 16:29:25 +0100464 if (!lr || lr->processed)
Johannes Bergf6037d02008-10-21 11:01:33 +0200465 return false;
466
Johannes Bergc492db32012-12-06 16:29:25 +0100467 return alpha2_equal(lr->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700468}
469
470/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200471static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700472{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200473 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700474 u32 freq_diff;
475
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800476 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700477 return false;
478
479 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
480 return false;
481
482 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
483
Roel Kluinbd05f282009-03-03 22:55:21 +0100484 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
Johannes Berg1a919312012-12-03 17:21:11 +0100485 freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700486 return false;
487
488 return true;
489}
490
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200491static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700492{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200493 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700494 unsigned int i;
495
496 if (!rd->n_reg_rules)
497 return false;
498
Luis R. Rodriguez88dc1c32008-11-12 14:22:01 -0800499 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
500 return false;
501
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700502 for (i = 0; i < rd->n_reg_rules; i++) {
503 reg_rule = &rd->reg_rules[i];
504 if (!is_valid_reg_rule(reg_rule))
505 return false;
506 }
507
508 return true;
509}
510
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400511static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
Johannes Bergfe7ef5e2012-12-04 15:07:34 +0100512 u32 center_freq_khz, u32 bw_khz)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700513{
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400514 u32 start_freq_khz, end_freq_khz;
515
516 start_freq_khz = center_freq_khz - (bw_khz/2);
517 end_freq_khz = center_freq_khz + (bw_khz/2);
518
519 if (start_freq_khz >= freq_range->start_freq_khz &&
520 end_freq_khz <= freq_range->end_freq_khz)
521 return true;
522
523 return false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700524}
525
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800526/**
527 * freq_in_rule_band - tells us if a frequency is in a frequency band
528 * @freq_range: frequency rule we want to query
529 * @freq_khz: frequency we are inquiring about
530 *
531 * This lets us know if a specific frequency rule is or is not relevant to
532 * a specific frequency's band. Bands are device specific and artificial
Vladimir Kondratiev64629b92012-09-23 09:49:54 +0200533 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
534 * however it is safe for now to assume that a frequency rule should not be
535 * part of a frequency's band if the start freq or end freq are off by more
536 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
537 * 60 GHz band.
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800538 * This resolution can be lowered and should be considered as we add
539 * regulatory rule support for other "bands".
540 **/
541static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
Johannes Berg1a919312012-12-03 17:21:11 +0100542 u32 freq_khz)
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800543{
544#define ONE_GHZ_IN_KHZ 1000000
Vladimir Kondratiev64629b92012-09-23 09:49:54 +0200545 /*
546 * From 802.11ad: directional multi-gigabit (DMG):
547 * Pertaining to operation in a frequency band containing a channel
548 * with the Channel starting frequency above 45 GHz.
549 */
550 u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
551 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
552 if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800553 return true;
Vladimir Kondratiev64629b92012-09-23 09:49:54 +0200554 if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800555 return true;
556 return false;
557#undef ONE_GHZ_IN_KHZ
558}
559
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500560/*
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500561 * Helper for regdom_intersect(), this does the real
562 * mathematical intersection fun
563 */
Johannes Berg1a919312012-12-03 17:21:11 +0100564static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,
565 const struct ieee80211_reg_rule *rule2,
566 struct ieee80211_reg_rule *intersected_rule)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700567{
568 const struct ieee80211_freq_range *freq_range1, *freq_range2;
569 struct ieee80211_freq_range *freq_range;
570 const struct ieee80211_power_rule *power_rule1, *power_rule2;
571 struct ieee80211_power_rule *power_rule;
572 u32 freq_diff;
573
574 freq_range1 = &rule1->freq_range;
575 freq_range2 = &rule2->freq_range;
576 freq_range = &intersected_rule->freq_range;
577
578 power_rule1 = &rule1->power_rule;
579 power_rule2 = &rule2->power_rule;
580 power_rule = &intersected_rule->power_rule;
581
582 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
Johannes Berg1a919312012-12-03 17:21:11 +0100583 freq_range2->start_freq_khz);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700584 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
Johannes Berg1a919312012-12-03 17:21:11 +0100585 freq_range2->end_freq_khz);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700586 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
Johannes Berg1a919312012-12-03 17:21:11 +0100587 freq_range2->max_bandwidth_khz);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700588
589 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
590 if (freq_range->max_bandwidth_khz > freq_diff)
591 freq_range->max_bandwidth_khz = freq_diff;
592
593 power_rule->max_eirp = min(power_rule1->max_eirp,
594 power_rule2->max_eirp);
595 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
596 power_rule2->max_antenna_gain);
597
Johannes Berg1a919312012-12-03 17:21:11 +0100598 intersected_rule->flags = rule1->flags | rule2->flags;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700599
600 if (!is_valid_reg_rule(intersected_rule))
601 return -EINVAL;
602
603 return 0;
604}
605
606/**
607 * regdom_intersect - do the intersection between two regulatory domains
608 * @rd1: first regulatory domain
609 * @rd2: second regulatory domain
610 *
611 * Use this function to get the intersection between two regulatory domains.
612 * Once completed we will mark the alpha2 for the rd as intersected, "98",
613 * as no one single alpha2 can represent this regulatory domain.
614 *
615 * Returns a pointer to the regulatory domain structure which will hold the
616 * resulting intersection of rules between rd1 and rd2. We will
617 * kzalloc() this structure for you.
618 */
Johannes Berg1a919312012-12-03 17:21:11 +0100619static struct ieee80211_regdomain *
620regdom_intersect(const struct ieee80211_regdomain *rd1,
621 const struct ieee80211_regdomain *rd2)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700622{
623 int r, size_of_regd;
624 unsigned int x, y;
625 unsigned int num_rules = 0, rule_idx = 0;
626 const struct ieee80211_reg_rule *rule1, *rule2;
627 struct ieee80211_reg_rule *intersected_rule;
628 struct ieee80211_regdomain *rd;
629 /* This is just a dummy holder to help us count */
Johannes Berg74f53cd2012-12-06 17:26:17 +0100630 struct ieee80211_reg_rule dummy_rule;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700631
632 if (!rd1 || !rd2)
633 return NULL;
634
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500635 /*
636 * First we get a count of the rules we'll need, then we actually
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700637 * build them. This is to so we can malloc() and free() a
638 * regdomain once. The reason we use reg_rules_intersect() here
639 * is it will return -EINVAL if the rule computed makes no sense.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500640 * All rules that do check out OK are valid.
641 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700642
643 for (x = 0; x < rd1->n_reg_rules; x++) {
644 rule1 = &rd1->reg_rules[x];
645 for (y = 0; y < rd2->n_reg_rules; y++) {
646 rule2 = &rd2->reg_rules[y];
Johannes Berg74f53cd2012-12-06 17:26:17 +0100647 if (!reg_rules_intersect(rule1, rule2, &dummy_rule))
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700648 num_rules++;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700649 }
650 }
651
652 if (!num_rules)
653 return NULL;
654
655 size_of_regd = sizeof(struct ieee80211_regdomain) +
Johannes Berg82f20852012-12-04 12:49:16 +0100656 num_rules * sizeof(struct ieee80211_reg_rule);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700657
658 rd = kzalloc(size_of_regd, GFP_KERNEL);
659 if (!rd)
660 return NULL;
661
Johannes Berg8a57fff2012-12-06 17:03:17 +0100662 for (x = 0; x < rd1->n_reg_rules && rule_idx < num_rules; x++) {
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700663 rule1 = &rd1->reg_rules[x];
Johannes Berg8a57fff2012-12-06 17:03:17 +0100664 for (y = 0; y < rd2->n_reg_rules && rule_idx < num_rules; y++) {
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700665 rule2 = &rd2->reg_rules[y];
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500666 /*
667 * This time around instead of using the stack lets
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700668 * write to the target rule directly saving ourselves
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500669 * a memcpy()
670 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700671 intersected_rule = &rd->reg_rules[rule_idx];
Johannes Berg1a919312012-12-03 17:21:11 +0100672 r = reg_rules_intersect(rule1, rule2, intersected_rule);
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500673 /*
674 * No need to memset here the intersected rule here as
675 * we're not using the stack anymore
676 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700677 if (r)
678 continue;
679 rule_idx++;
680 }
681 }
682
683 if (rule_idx != num_rules) {
684 kfree(rd);
685 return NULL;
686 }
687
688 rd->n_reg_rules = num_rules;
689 rd->alpha2[0] = '9';
690 rd->alpha2[1] = '8';
691
692 return rd;
693}
694
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500695/*
696 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
697 * want to just have the channel structure use these
698 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700699static u32 map_regdom_flags(u32 rd_flags)
700{
701 u32 channel_flags = 0;
702 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
703 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
704 if (rd_flags & NL80211_RRF_NO_IBSS)
705 channel_flags |= IEEE80211_CHAN_NO_IBSS;
706 if (rd_flags & NL80211_RRF_DFS)
707 channel_flags |= IEEE80211_CHAN_RADAR;
Seth Forshee03f6b082012-08-01 15:58:42 -0500708 if (rd_flags & NL80211_RRF_NO_OFDM)
709 channel_flags |= IEEE80211_CHAN_NO_OFDM;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700710 return channel_flags;
711}
712
Johannes Berg361c9c82012-12-06 15:57:14 +0100713static const struct ieee80211_reg_rule *
714freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq,
715 const struct ieee80211_regdomain *regd)
Johannes Berg8318d782008-01-24 19:38:38 +0100716{
717 int i;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800718 bool band_rule_found = false;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400719 bool bw_fits = false;
720
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800721 if (!regd)
Johannes Berg361c9c82012-12-06 15:57:14 +0100722 return ERR_PTR(-EINVAL);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700723
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800724 for (i = 0; i < regd->n_reg_rules; i++) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700725 const struct ieee80211_reg_rule *rr;
726 const struct ieee80211_freq_range *fr = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700727
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800728 rr = &regd->reg_rules[i];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700729 fr = &rr->freq_range;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800730
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500731 /*
732 * We only need to know if one frequency rule was
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800733 * was in center_freq's band, that's enough, so lets
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500734 * not overwrite it once found
735 */
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800736 if (!band_rule_found)
737 band_rule_found = freq_in_rule_band(fr, center_freq);
738
Johannes Bergfe7ef5e2012-12-04 15:07:34 +0100739 bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20));
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800740
Johannes Berg361c9c82012-12-06 15:57:14 +0100741 if (band_rule_found && bw_fits)
742 return rr;
Johannes Berg8318d782008-01-24 19:38:38 +0100743 }
744
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800745 if (!band_rule_found)
Johannes Berg361c9c82012-12-06 15:57:14 +0100746 return ERR_PTR(-ERANGE);
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800747
Johannes Berg361c9c82012-12-06 15:57:14 +0100748 return ERR_PTR(-EINVAL);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700749}
750
Johannes Berg361c9c82012-12-06 15:57:14 +0100751const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
752 u32 center_freq)
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800753{
Johannes Berg5d885b92012-12-04 00:14:17 +0100754 const struct ieee80211_regdomain *regd;
Johannes Bergc492db32012-12-06 16:29:25 +0100755 struct regulatory_request *lr = get_last_request();
Johannes Berg1a919312012-12-03 17:21:11 +0100756
Johannes Berg5d885b92012-12-04 00:14:17 +0100757 /*
758 * Follow the driver's regulatory domain, if present, unless a country
759 * IE has been processed or a user wants to help complaince further
760 */
Johannes Bergc492db32012-12-06 16:29:25 +0100761 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
762 lr->initiator != NL80211_REGDOM_SET_BY_USER &&
Johannes Berg5d885b92012-12-04 00:14:17 +0100763 wiphy->regd)
Johannes Berg458f4f92012-12-06 15:47:38 +0100764 regd = get_wiphy_regdom(wiphy);
Johannes Berg5d885b92012-12-04 00:14:17 +0100765 else
Johannes Berg458f4f92012-12-06 15:47:38 +0100766 regd = get_cfg80211_regdom();
Johannes Berg5d885b92012-12-04 00:14:17 +0100767
Johannes Berg361c9c82012-12-06 15:57:14 +0100768 return freq_reg_info_regd(wiphy, center_freq, regd);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800769}
John W. Linville4f366c52010-07-15 14:57:33 -0400770EXPORT_SYMBOL(freq_reg_info);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700771
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530772#ifdef CONFIG_CFG80211_REG_DEBUG
773static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
774{
775 switch (initiator) {
776 case NL80211_REGDOM_SET_BY_CORE:
777 return "Set by core";
778 case NL80211_REGDOM_SET_BY_USER:
779 return "Set by user";
780 case NL80211_REGDOM_SET_BY_DRIVER:
781 return "Set by driver";
782 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
783 return "Set by country IE";
784 default:
785 WARN_ON(1);
786 return "Set by bug";
787 }
788}
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530789
790static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530791 const struct ieee80211_reg_rule *reg_rule)
792{
793 const struct ieee80211_power_rule *power_rule;
794 const struct ieee80211_freq_range *freq_range;
795 char max_antenna_gain[32];
796
797 power_rule = &reg_rule->power_rule;
798 freq_range = &reg_rule->freq_range;
799
800 if (!power_rule->max_antenna_gain)
801 snprintf(max_antenna_gain, 32, "N/A");
802 else
803 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
804
Johannes Bergfe7ef5e2012-12-04 15:07:34 +0100805 REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
806 chan->center_freq);
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530807
Pavel Roskin56e67862011-09-01 11:54:12 -0400808 REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
Johannes Berg1a919312012-12-03 17:21:11 +0100809 freq_range->start_freq_khz, freq_range->end_freq_khz,
810 freq_range->max_bandwidth_khz, max_antenna_gain,
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530811 power_rule->max_eirp);
812}
813#else
814static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530815 const struct ieee80211_reg_rule *reg_rule)
816{
817 return;
818}
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530819#endif
820
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400821/*
822 * Note that right now we assume the desired channel bandwidth
823 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
Johannes Bergfe7ef5e2012-12-04 15:07:34 +0100824 * per channel, the primary and the extension channel).
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400825 */
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700826static void handle_channel(struct wiphy *wiphy,
827 enum nl80211_reg_initiator initiator,
Johannes Bergfdc9d7b2012-12-03 18:36:09 +0100828 struct ieee80211_channel *chan)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700829{
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400830 u32 flags, bw_flags = 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700831 const struct ieee80211_reg_rule *reg_rule = NULL;
832 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400833 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500834 struct wiphy *request_wiphy = NULL;
Johannes Bergc492db32012-12-06 16:29:25 +0100835 struct regulatory_request *lr = get_last_request();
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800836
Johannes Bergc492db32012-12-06 16:29:25 +0100837 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500838
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800839 flags = chan->orig_flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700840
Johannes Berg361c9c82012-12-06 15:57:14 +0100841 reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
842 if (IS_ERR(reg_rule)) {
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700843 /*
844 * We will disable all channels that do not match our
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300845 * received regulatory rule unless the hint is coming
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700846 * from a Country IE and the Country IE had no information
847 * about a band. The IEEE 802.11 spec allows for an AP
848 * to send only a subset of the regulatory rules allowed,
849 * so an AP in the US that only supports 2.4 GHz may only send
850 * a country IE with information for the 2.4 GHz band
851 * while 5 GHz is still supported.
852 */
853 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Johannes Berg361c9c82012-12-06 15:57:14 +0100854 PTR_ERR(reg_rule) == -ERANGE)
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700855 return;
856
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700857 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700858 chan->flags = IEEE80211_CHAN_DISABLED;
Johannes Berg8318d782008-01-24 19:38:38 +0100859 return;
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700860 }
Johannes Berg8318d782008-01-24 19:38:38 +0100861
Johannes Bergfe7ef5e2012-12-04 15:07:34 +0100862 chan_reg_rule_print_dbg(chan, reg_rule);
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530863
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700864 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400865 freq_range = &reg_rule->freq_range;
866
867 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
868 bw_flags = IEEE80211_CHAN_NO_HT40;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700869
Johannes Bergc492db32012-12-06 16:29:25 +0100870 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500871 request_wiphy && request_wiphy == wiphy &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100872 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500873 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300874 * This guarantees the driver's requested regulatory domain
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800875 * will always be used as a base for further regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500876 * settings
877 */
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800878 chan->flags = chan->orig_flags =
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400879 map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800880 chan->max_antenna_gain = chan->orig_mag =
881 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Felix Fietkau279f0f52012-10-17 13:56:20 +0200882 chan->max_reg_power = chan->max_power = chan->orig_mpwr =
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800883 (int) MBM_TO_DBM(power_rule->max_eirp);
884 return;
885 }
886
Rajkumar Manoharanaa3d7ee2011-09-14 14:28:17 +0530887 chan->beacon_found = false;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400888 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
Johannes Berg1a919312012-12-03 17:21:11 +0100889 chan->max_antenna_gain =
890 min_t(int, chan->orig_mag,
891 MBI_TO_DBI(power_rule->max_antenna_gain));
Hong Wueccc0682012-01-11 20:33:39 +0200892 chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
Stanislaw Gruszka5e31fc02012-07-24 08:35:39 +0200893 if (chan->orig_mpwr) {
894 /*
895 * Devices that have their own custom regulatory domain
896 * but also use WIPHY_FLAG_STRICT_REGULATORY will follow the
897 * passed country IE power settings.
898 */
899 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
900 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
901 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
902 chan->max_power = chan->max_reg_power;
903 else
904 chan->max_power = min(chan->orig_mpwr,
905 chan->max_reg_power);
906 } else
907 chan->max_power = chan->max_reg_power;
Johannes Berg8318d782008-01-24 19:38:38 +0100908}
909
Johannes Bergfdc9d7b2012-12-03 18:36:09 +0100910static void handle_band(struct wiphy *wiphy,
911 enum nl80211_reg_initiator initiator,
912 struct ieee80211_supported_band *sband)
Johannes Berg8318d782008-01-24 19:38:38 +0100913{
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800914 unsigned int i;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800915
Johannes Bergfdc9d7b2012-12-03 18:36:09 +0100916 if (!sband)
917 return;
Johannes Berg8318d782008-01-24 19:38:38 +0100918
919 for (i = 0; i < sband->n_channels; i++)
Johannes Bergfdc9d7b2012-12-03 18:36:09 +0100920 handle_channel(wiphy, initiator, &sband->channels[i]);
Johannes Berg8318d782008-01-24 19:38:38 +0100921}
922
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700923static bool reg_request_cell_base(struct regulatory_request *request)
924{
925 if (request->initiator != NL80211_REGDOM_SET_BY_USER)
926 return false;
Johannes Berg1a919312012-12-03 17:21:11 +0100927 return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700928}
929
930bool reg_last_request_cell_base(void)
931{
Mohammed Shafi Shajakhanebd0fd22012-07-18 18:11:29 +0530932 bool val;
Johannes Berg1a919312012-12-03 17:21:11 +0100933
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700934 mutex_lock(&reg_mutex);
Johannes Bergc492db32012-12-06 16:29:25 +0100935 val = reg_request_cell_base(get_last_request());
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700936 mutex_unlock(&reg_mutex);
Johannes Berg1a919312012-12-03 17:21:11 +0100937
Mohammed Shafi Shajakhanebd0fd22012-07-18 18:11:29 +0530938 return val;
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700939}
940
941#ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700942/* Core specific check */
Johannes Berg2f922122012-12-03 17:54:55 +0100943static enum reg_request_treatment
944reg_ignore_cell_hint(struct regulatory_request *pending_request)
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700945{
Johannes Bergc492db32012-12-06 16:29:25 +0100946 struct regulatory_request *lr = get_last_request();
947
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700948 if (!reg_num_devs_support_basehint)
Johannes Berg2f922122012-12-03 17:54:55 +0100949 return REG_REQ_IGNORE;
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700950
Johannes Bergc492db32012-12-06 16:29:25 +0100951 if (reg_request_cell_base(lr) &&
Johannes Berg1a919312012-12-03 17:21:11 +0100952 !regdom_changes(pending_request->alpha2))
Johannes Berg2f922122012-12-03 17:54:55 +0100953 return REG_REQ_ALREADY_SET;
Johannes Berg1a919312012-12-03 17:21:11 +0100954
Johannes Berg2f922122012-12-03 17:54:55 +0100955 return REG_REQ_OK;
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700956}
957
958/* Device specific check */
959static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
960{
Johannes Berg1a919312012-12-03 17:21:11 +0100961 return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700962}
963#else
964static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
965{
Johannes Berg2f922122012-12-03 17:54:55 +0100966 return REG_REQ_IGNORE;
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700967}
Johannes Berg1a919312012-12-03 17:21:11 +0100968
969static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -0700970{
971 return true;
972}
973#endif
974
975
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400976static bool ignore_reg_update(struct wiphy *wiphy,
977 enum nl80211_reg_initiator initiator)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800978{
Johannes Bergc492db32012-12-06 16:29:25 +0100979 struct regulatory_request *lr = get_last_request();
980
981 if (!lr) {
Johannes Berg1a919312012-12-03 17:21:11 +0100982 REG_DBG_PRINT("Ignoring regulatory request %s since last_request is not set\n",
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530983 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800984 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530985 }
986
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400987 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530988 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
Johannes Berg1a919312012-12-03 17:21:11 +0100989 REG_DBG_PRINT("Ignoring regulatory request %s since the driver uses its own custom regulatory domain\n",
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530990 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800991 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530992 }
993
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500994 /*
995 * wiphy->regd will be set once the device has its own
996 * desired regulatory domain set
997 */
Johannes Berg5be83de2009-11-19 00:56:28 +0100998 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
Luis R. Rodriguez749b5272010-10-20 10:18:54 -0700999 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Johannes Bergc492db32012-12-06 16:29:25 +01001000 !is_world_regdom(lr->alpha2)) {
Johannes Berg1a919312012-12-03 17:21:11 +01001001 REG_DBG_PRINT("Ignoring regulatory request %s since the driver requires its own regulatory domain to be set first\n",
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +05301002 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -08001003 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +05301004 }
1005
Johannes Bergc492db32012-12-06 16:29:25 +01001006 if (reg_request_cell_base(lr))
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07001007 return reg_dev_ignore_cell_hint(wiphy);
1008
Luis R. Rodriguez14b98152008-11-12 14:22:03 -08001009 return false;
1010}
1011
Luis R. Rodriguez3195e482012-12-19 10:53:03 -08001012static bool reg_is_world_roaming(struct wiphy *wiphy)
1013{
1014 const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
1015 const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
1016 struct regulatory_request *lr = get_last_request();
1017
1018 if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
1019 return true;
1020
1021 if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1022 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1023 return true;
1024
1025 return false;
1026}
1027
Johannes Berg1a919312012-12-03 17:21:11 +01001028static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001029 struct reg_beacon *reg_beacon)
1030{
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001031 struct ieee80211_supported_band *sband;
1032 struct ieee80211_channel *chan;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -04001033 bool channel_changed = false;
1034 struct ieee80211_channel chan_before;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001035
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001036 sband = wiphy->bands[reg_beacon->chan.band];
1037 chan = &sband->channels[chan_idx];
1038
1039 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
1040 return;
1041
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -04001042 if (chan->beacon_found)
1043 return;
1044
1045 chan->beacon_found = true;
1046
Luis R. Rodriguez0f500a52012-12-19 10:53:04 -08001047 if (!reg_is_world_roaming(wiphy))
1048 return;
1049
Johannes Berg5be83de2009-11-19 00:56:28 +01001050 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
Luis R. Rodriguez37184242009-07-30 17:43:48 -07001051 return;
1052
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -04001053 chan_before.center_freq = chan->center_freq;
1054 chan_before.flags = chan->flags;
1055
Luis R. Rodriguez37184242009-07-30 17:43:48 -07001056 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001057 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -04001058 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001059 }
1060
Luis R. Rodriguez37184242009-07-30 17:43:48 -07001061 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001062 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -04001063 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001064 }
1065
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -04001066 if (channel_changed)
1067 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001068}
1069
1070/*
1071 * Called when a scan on a wiphy finds a beacon on
1072 * new channel
1073 */
1074static void wiphy_update_new_beacon(struct wiphy *wiphy,
1075 struct reg_beacon *reg_beacon)
1076{
1077 unsigned int i;
1078 struct ieee80211_supported_band *sband;
1079
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001080 if (!wiphy->bands[reg_beacon->chan.band])
1081 return;
1082
1083 sband = wiphy->bands[reg_beacon->chan.band];
1084
1085 for (i = 0; i < sband->n_channels; i++)
1086 handle_reg_beacon(wiphy, i, reg_beacon);
1087}
1088
1089/*
1090 * Called upon reg changes or a new wiphy is added
1091 */
1092static void wiphy_update_beacon_reg(struct wiphy *wiphy)
1093{
1094 unsigned int i;
1095 struct ieee80211_supported_band *sband;
1096 struct reg_beacon *reg_beacon;
1097
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001098 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1099 if (!wiphy->bands[reg_beacon->chan.band])
1100 continue;
1101 sband = wiphy->bands[reg_beacon->chan.band];
1102 for (i = 0; i < sband->n_channels; i++)
1103 handle_reg_beacon(wiphy, i, reg_beacon);
1104 }
1105}
1106
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001107/* Reap the advantages of previously found beacons */
1108static void reg_process_beacons(struct wiphy *wiphy)
1109{
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -04001110 /*
1111 * Means we are just firing up cfg80211, so no beacons would
1112 * have been processed yet.
1113 */
1114 if (!last_request)
1115 return;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001116 wiphy_update_beacon_reg(wiphy);
1117}
1118
Johannes Berg1a919312012-12-03 17:21:11 +01001119static bool is_ht40_allowed(struct ieee80211_channel *chan)
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001120{
1121 if (!chan)
Johannes Berg1a919312012-12-03 17:21:11 +01001122 return false;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001123 if (chan->flags & IEEE80211_CHAN_DISABLED)
Johannes Berg1a919312012-12-03 17:21:11 +01001124 return false;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001125 /* This would happen when regulatory rules disallow HT40 completely */
Johannes Berg1a919312012-12-03 17:21:11 +01001126 return !(chan->flags & IEEE80211_CHAN_NO_HT40);
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001127}
1128
1129static void reg_process_ht_flags_channel(struct wiphy *wiphy,
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001130 struct ieee80211_channel *channel)
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001131{
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001132 struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001133 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1134 unsigned int i;
1135
Johannes Berg1a919312012-12-03 17:21:11 +01001136 if (!is_ht40_allowed(channel)) {
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001137 channel->flags |= IEEE80211_CHAN_NO_HT40;
1138 return;
1139 }
1140
1141 /*
1142 * We need to ensure the extension channels exist to
1143 * be able to use HT40- or HT40+, this finds them (or not)
1144 */
1145 for (i = 0; i < sband->n_channels; i++) {
1146 struct ieee80211_channel *c = &sband->channels[i];
Johannes Berg1a919312012-12-03 17:21:11 +01001147
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001148 if (c->center_freq == (channel->center_freq - 20))
1149 channel_before = c;
1150 if (c->center_freq == (channel->center_freq + 20))
1151 channel_after = c;
1152 }
1153
1154 /*
1155 * Please note that this assumes target bandwidth is 20 MHz,
1156 * if that ever changes we also need to change the below logic
1157 * to include that as well.
1158 */
Johannes Berg1a919312012-12-03 17:21:11 +01001159 if (!is_ht40_allowed(channel_before))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001160 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001161 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001162 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001163
Johannes Berg1a919312012-12-03 17:21:11 +01001164 if (!is_ht40_allowed(channel_after))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001165 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001166 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001167 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001168}
1169
1170static void reg_process_ht_flags_band(struct wiphy *wiphy,
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001171 struct ieee80211_supported_band *sband)
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001172{
1173 unsigned int i;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001174
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001175 if (!sband)
1176 return;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001177
1178 for (i = 0; i < sband->n_channels; i++)
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001179 reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001180}
1181
1182static void reg_process_ht_flags(struct wiphy *wiphy)
1183{
1184 enum ieee80211_band band;
1185
1186 if (!wiphy)
1187 return;
1188
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001189 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1190 reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001191}
1192
Sven Neumanneac03e32011-08-30 23:38:53 +02001193static void wiphy_update_regulatory(struct wiphy *wiphy,
1194 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +01001195{
1196 enum ieee80211_band band;
Johannes Bergc492db32012-12-06 16:29:25 +01001197 struct regulatory_request *lr = get_last_request();
Sven Neumanneac03e32011-08-30 23:38:53 +02001198
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001199 if (ignore_reg_update(wiphy, initiator))
Sven Neumanna203c2a2011-07-12 15:52:07 +02001200 return;
1201
Johannes Bergc492db32012-12-06 16:29:25 +01001202 lr->dfs_region = get_cfg80211_regdom()->dfs_region;
Luis R. Rodriguezb68e6b32011-10-11 10:59:03 -07001203
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001204 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1205 handle_band(wiphy, initiator, wiphy->bands[band]);
Sven Neumanna203c2a2011-07-12 15:52:07 +02001206
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001207 reg_process_beacons(wiphy);
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001208 reg_process_ht_flags(wiphy);
Johannes Berg1a919312012-12-03 17:21:11 +01001209
Luis R. Rodriguez560e28e2009-01-07 17:43:32 -08001210 if (wiphy->reg_notifier)
Johannes Bergc492db32012-12-06 16:29:25 +01001211 wiphy->reg_notifier(wiphy, lr);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001212}
1213
Sven Neumannd7549cb2011-08-30 23:38:54 +02001214static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
1215{
1216 struct cfg80211_registered_device *rdev;
Rajkumar Manoharan4a389942011-12-08 23:59:26 +05301217 struct wiphy *wiphy;
Sven Neumannd7549cb2011-08-30 23:38:54 +02001218
Johannes Berg458f4f92012-12-06 15:47:38 +01001219 assert_cfg80211_lock();
1220
Rajkumar Manoharan4a389942011-12-08 23:59:26 +05301221 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1222 wiphy = &rdev->wiphy;
1223 wiphy_update_regulatory(wiphy, initiator);
1224 /*
1225 * Regulatory updates set by CORE are ignored for custom
1226 * regulatory cards. Let us notify the changes to the driver,
1227 * as some drivers used this to restore its orig_* reg domain.
1228 */
1229 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
1230 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
1231 wiphy->reg_notifier)
Johannes Bergc492db32012-12-06 16:29:25 +01001232 wiphy->reg_notifier(wiphy, get_last_request());
Rajkumar Manoharan4a389942011-12-08 23:59:26 +05301233 }
Sven Neumannd7549cb2011-08-30 23:38:54 +02001234}
1235
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001236static void handle_channel_custom(struct wiphy *wiphy,
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001237 struct ieee80211_channel *chan,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001238 const struct ieee80211_regdomain *regd)
1239{
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001240 u32 bw_flags = 0;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001241 const struct ieee80211_reg_rule *reg_rule = NULL;
1242 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001243 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001244
Johannes Berg361c9c82012-12-06 15:57:14 +01001245 reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1246 regd);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001247
Johannes Berg361c9c82012-12-06 15:57:14 +01001248 if (IS_ERR(reg_rule)) {
Johannes Bergfe7ef5e2012-12-04 15:07:34 +01001249 REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1250 chan->center_freq);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001251 chan->flags = IEEE80211_CHAN_DISABLED;
1252 return;
1253 }
1254
Johannes Bergfe7ef5e2012-12-04 15:07:34 +01001255 chan_reg_rule_print_dbg(chan, reg_rule);
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +05301256
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001257 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001258 freq_range = &reg_rule->freq_range;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001259
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001260 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1261 bw_flags = IEEE80211_CHAN_NO_HT40;
1262
1263 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001264 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Felix Fietkau279f0f52012-10-17 13:56:20 +02001265 chan->max_reg_power = chan->max_power =
1266 (int) MBM_TO_DBM(power_rule->max_eirp);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001267}
1268
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001269static void handle_band_custom(struct wiphy *wiphy,
1270 struct ieee80211_supported_band *sband,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001271 const struct ieee80211_regdomain *regd)
1272{
1273 unsigned int i;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001274
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001275 if (!sband)
1276 return;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001277
1278 for (i = 0; i < sband->n_channels; i++)
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001279 handle_channel_custom(wiphy, &sband->channels[i], regd);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001280}
1281
1282/* Used by drivers prior to wiphy registration */
1283void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1284 const struct ieee80211_regdomain *regd)
1285{
1286 enum ieee80211_band band;
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001287 unsigned int bands_set = 0;
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001288
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001289 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001290 if (!wiphy->bands[band])
1291 continue;
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001292 handle_band_custom(wiphy, wiphy->bands[band], regd);
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001293 bands_set++;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001294 }
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001295
1296 /*
1297 * no point in calling this if it won't have any effect
Johannes Berg1a919312012-12-03 17:21:11 +01001298 * on your device's supported bands.
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001299 */
1300 WARN_ON(!bands_set);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001301}
1302EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1303
Johannes Berg84fa4f42008-10-24 20:32:23 +02001304/* This has the logic which determines when a new request
1305 * should be ignored. */
Johannes Berg2f922122012-12-03 17:54:55 +01001306static enum reg_request_treatment
1307get_reg_request_treatment(struct wiphy *wiphy,
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001308 struct regulatory_request *pending_request)
Johannes Berg84fa4f42008-10-24 20:32:23 +02001309{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001310 struct wiphy *last_wiphy = NULL;
Johannes Bergc492db32012-12-06 16:29:25 +01001311 struct regulatory_request *lr = get_last_request();
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001312
Johannes Berg84fa4f42008-10-24 20:32:23 +02001313 /* All initial requests are respected */
Johannes Bergc492db32012-12-06 16:29:25 +01001314 if (!lr)
Johannes Berg2f922122012-12-03 17:54:55 +01001315 return REG_REQ_OK;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001316
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001317 switch (pending_request->initiator) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001318 case NL80211_REGDOM_SET_BY_CORE:
Johannes Berg2f922122012-12-03 17:54:55 +01001319 return REG_REQ_OK;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001320 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
Johannes Bergc492db32012-12-06 16:29:25 +01001321 if (reg_request_cell_base(lr)) {
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07001322 /* Trust a Cell base station over the AP's country IE */
1323 if (regdom_changes(pending_request->alpha2))
Johannes Berg2f922122012-12-03 17:54:55 +01001324 return REG_REQ_IGNORE;
1325 return REG_REQ_ALREADY_SET;
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07001326 }
1327
Johannes Bergc492db32012-12-06 16:29:25 +01001328 last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001329
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001330 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001331 return -EINVAL;
Johannes Bergc492db32012-12-06 16:29:25 +01001332 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001333 if (last_wiphy != wiphy) {
Johannes Berg84fa4f42008-10-24 20:32:23 +02001334 /*
1335 * Two cards with two APs claiming different
Thadeu Lima de Souza Cascardo1fe90b02009-08-11 11:18:42 -03001336 * Country IE alpha2s. We could
Johannes Berg84fa4f42008-10-24 20:32:23 +02001337 * intersect them, but that seems unlikely
1338 * to be correct. Reject second one for now.
1339 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001340 if (regdom_changes(pending_request->alpha2))
Johannes Berg2f922122012-12-03 17:54:55 +01001341 return REG_REQ_IGNORE;
1342 return REG_REQ_ALREADY_SET;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001343 }
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001344 /*
1345 * Two consecutive Country IE hints on the same wiphy.
1346 * This should be picked up early by the driver/stack
1347 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001348 if (WARN_ON(regdom_changes(pending_request->alpha2)))
Johannes Berg2f922122012-12-03 17:54:55 +01001349 return REG_REQ_OK;
1350 return REG_REQ_ALREADY_SET;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001351 }
Luis R. Rodrigueza171fba2010-10-18 17:44:51 -07001352 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001353 case NL80211_REGDOM_SET_BY_DRIVER:
Johannes Bergc492db32012-12-06 16:29:25 +01001354 if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001355 if (regdom_changes(pending_request->alpha2))
Johannes Berg2f922122012-12-03 17:54:55 +01001356 return REG_REQ_OK;
1357 return REG_REQ_ALREADY_SET;
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001358 }
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001359
1360 /*
1361 * This would happen if you unplug and plug your card
1362 * back in or if you add a new device for which the previously
1363 * loaded card also agrees on the regulatory domain.
1364 */
Johannes Bergc492db32012-12-06 16:29:25 +01001365 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001366 !regdom_changes(pending_request->alpha2))
Johannes Berg2f922122012-12-03 17:54:55 +01001367 return REG_REQ_ALREADY_SET;
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001368
Johannes Berg2f922122012-12-03 17:54:55 +01001369 return REG_REQ_INTERSECT;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001370 case NL80211_REGDOM_SET_BY_USER:
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07001371 if (reg_request_cell_base(pending_request))
1372 return reg_ignore_cell_hint(pending_request);
1373
Johannes Bergc492db32012-12-06 16:29:25 +01001374 if (reg_request_cell_base(lr))
Johannes Berg2f922122012-12-03 17:54:55 +01001375 return REG_REQ_IGNORE;
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07001376
Johannes Bergc492db32012-12-06 16:29:25 +01001377 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
Johannes Berg2f922122012-12-03 17:54:55 +01001378 return REG_REQ_INTERSECT;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001379 /*
1380 * If the user knows better the user should set the regdom
1381 * to their country before the IE is picked up
1382 */
Johannes Bergc492db32012-12-06 16:29:25 +01001383 if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
1384 lr->intersect)
Johannes Berg2f922122012-12-03 17:54:55 +01001385 return REG_REQ_IGNORE;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001386 /*
1387 * Process user requests only after previous user/driver/core
1388 * requests have been processed
1389 */
Johannes Bergc492db32012-12-06 16:29:25 +01001390 if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
1391 lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1392 lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
1393 regdom_changes(lr->alpha2))
Johannes Berg2f922122012-12-03 17:54:55 +01001394 return REG_REQ_IGNORE;
Luis R. Rodriguez5eebade2009-01-22 15:05:47 -08001395
John W. Linvillebaeb66f2009-12-18 17:59:02 -05001396 if (!regdom_changes(pending_request->alpha2))
Johannes Berg2f922122012-12-03 17:54:55 +01001397 return REG_REQ_ALREADY_SET;
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001398
Johannes Berg2f922122012-12-03 17:54:55 +01001399 return REG_REQ_OK;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001400 }
1401
Johannes Berg2f922122012-12-03 17:54:55 +01001402 return REG_REQ_IGNORE;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001403}
1404
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001405static void reg_set_request_processed(void)
1406{
1407 bool need_more_processing = false;
Johannes Bergc492db32012-12-06 16:29:25 +01001408 struct regulatory_request *lr = get_last_request();
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001409
Johannes Bergc492db32012-12-06 16:29:25 +01001410 lr->processed = true;
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001411
1412 spin_lock(&reg_requests_lock);
1413 if (!list_empty(&reg_requests_list))
1414 need_more_processing = true;
1415 spin_unlock(&reg_requests_lock);
1416
Johannes Bergc492db32012-12-06 16:29:25 +01001417 if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
Eliad Pellerfe20b392012-06-12 12:53:13 +03001418 cancel_delayed_work(&reg_timeout);
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001419
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001420 if (need_more_processing)
1421 schedule_work(&reg_work);
1422}
1423
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001424/**
1425 * __regulatory_hint - hint to the wireless core a regulatory domain
1426 * @wiphy: if the hint comes from country information from an AP, this
1427 * is required to be set to the wiphy that received the information
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001428 * @pending_request: the regulatory request currently being processed
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001429 *
1430 * The Wireless subsystem can use this function to hint to the wireless core
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001431 * what it believes should be the current regulatory domain.
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001432 *
Johannes Berg2f922122012-12-03 17:54:55 +01001433 * Returns one of the different reg request treatment values.
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001434 *
Johannes Berg458f4f92012-12-06 15:47:38 +01001435 * Caller must hold &reg_mutex
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001436 */
Johannes Berg2f922122012-12-03 17:54:55 +01001437static enum reg_request_treatment
1438__regulatory_hint(struct wiphy *wiphy,
1439 struct regulatory_request *pending_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001440{
Johannes Berge9763c32012-12-03 16:59:46 +01001441 const struct ieee80211_regdomain *regd;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001442 bool intersect = false;
Johannes Berg2f922122012-12-03 17:54:55 +01001443 enum reg_request_treatment treatment;
Johannes Bergc492db32012-12-06 16:29:25 +01001444 struct regulatory_request *lr;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001445
Johannes Berg2f922122012-12-03 17:54:55 +01001446 treatment = get_reg_request_treatment(wiphy, pending_request);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001447
Johannes Berg2f922122012-12-03 17:54:55 +01001448 switch (treatment) {
1449 case REG_REQ_INTERSECT:
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001450 if (pending_request->initiator ==
1451 NL80211_REGDOM_SET_BY_DRIVER) {
Johannes Berg458f4f92012-12-06 15:47:38 +01001452 regd = reg_copy_regd(get_cfg80211_regdom());
Johannes Berge9763c32012-12-03 16:59:46 +01001453 if (IS_ERR(regd)) {
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001454 kfree(pending_request);
Johannes Berge9763c32012-12-03 16:59:46 +01001455 return PTR_ERR(regd);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001456 }
Johannes Berg458f4f92012-12-06 15:47:38 +01001457 rcu_assign_pointer(wiphy->regd, regd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001458 }
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001459 intersect = true;
Johannes Berg2f922122012-12-03 17:54:55 +01001460 break;
1461 case REG_REQ_OK:
1462 break;
1463 default:
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001464 /*
1465 * If the regulatory domain being requested by the
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001466 * driver has already been set just copy it to the
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001467 * wiphy
1468 */
Johannes Berg2f922122012-12-03 17:54:55 +01001469 if (treatment == REG_REQ_ALREADY_SET &&
1470 pending_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) {
Johannes Berg458f4f92012-12-06 15:47:38 +01001471 regd = reg_copy_regd(get_cfg80211_regdom());
Johannes Berge9763c32012-12-03 16:59:46 +01001472 if (IS_ERR(regd)) {
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001473 kfree(pending_request);
Johannes Berg2f922122012-12-03 17:54:55 +01001474 return REG_REQ_IGNORE;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001475 }
Johannes Berg2f922122012-12-03 17:54:55 +01001476 treatment = REG_REQ_ALREADY_SET;
Johannes Berg458f4f92012-12-06 15:47:38 +01001477 rcu_assign_pointer(wiphy->regd, regd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001478 goto new_request;
1479 }
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001480 kfree(pending_request);
Johannes Berg2f922122012-12-03 17:54:55 +01001481 return treatment;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001482 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001483
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001484new_request:
Johannes Bergc492db32012-12-06 16:29:25 +01001485 lr = get_last_request();
1486 if (lr != &core_request_world && lr)
1487 kfree_rcu(lr, rcu_head);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001488
Johannes Bergc492db32012-12-06 16:29:25 +01001489 pending_request->intersect = intersect;
1490 pending_request->processed = false;
1491 rcu_assign_pointer(last_request, pending_request);
1492 lr = pending_request;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001493
1494 pending_request = NULL;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001495
Johannes Bergc492db32012-12-06 16:29:25 +01001496 if (lr->initiator == NL80211_REGDOM_SET_BY_USER) {
1497 user_alpha2[0] = lr->alpha2[0];
1498 user_alpha2[1] = lr->alpha2[1];
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001499 }
1500
Johannes Berg2f922122012-12-03 17:54:55 +01001501 /* When r == REG_REQ_INTERSECT we do need to call CRDA */
1502 if (treatment != REG_REQ_OK && treatment != REG_REQ_INTERSECT) {
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001503 /*
1504 * Since CRDA will not be called in this case as we already
1505 * have applied the requested regulatory domain before we just
1506 * inform userspace we have processed the request
1507 */
Johannes Berg2f922122012-12-03 17:54:55 +01001508 if (treatment == REG_REQ_ALREADY_SET) {
Johannes Bergc492db32012-12-06 16:29:25 +01001509 nl80211_send_reg_change_event(lr);
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001510 reg_set_request_processed();
1511 }
Johannes Berg2f922122012-12-03 17:54:55 +01001512 return treatment;
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001513 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001514
Johannes Bergc492db32012-12-06 16:29:25 +01001515 if (call_crda(lr->alpha2))
Johannes Berg2f922122012-12-03 17:54:55 +01001516 return REG_REQ_IGNORE;
1517 return REG_REQ_OK;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001518}
1519
Luis R. Rodriguez30a548c2009-05-02 01:17:27 -04001520/* This processes *all* regulatory hints */
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001521static void reg_process_hint(struct regulatory_request *reg_request,
1522 enum nl80211_reg_initiator reg_initiator)
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001523{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001524 struct wiphy *wiphy = NULL;
1525
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001526 if (WARN_ON(!reg_request->alpha2))
1527 return;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001528
Johannes Bergf4173762012-12-03 18:23:37 +01001529 if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001530 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1531
Johannes Berg1a919312012-12-03 17:21:11 +01001532 if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER && !wiphy) {
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001533 kfree(reg_request);
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001534 return;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001535 }
1536
Johannes Berg2f922122012-12-03 17:54:55 +01001537 switch (__regulatory_hint(wiphy, reg_request)) {
1538 case REG_REQ_ALREADY_SET:
1539 /* This is required so that the orig_* parameters are saved */
1540 if (wiphy && wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
1541 wiphy_update_regulatory(wiphy, reg_initiator);
1542 break;
1543 default:
1544 if (reg_initiator == NL80211_REGDOM_SET_BY_USER)
1545 schedule_delayed_work(&reg_timeout,
1546 msecs_to_jiffies(3142));
1547 break;
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001548 }
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001549}
1550
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001551/*
1552 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1553 * Regulatory hints come on a first come first serve basis and we
1554 * must process each one atomically.
1555 */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001556static void reg_process_pending_hints(void)
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001557{
Johannes Bergc492db32012-12-06 16:29:25 +01001558 struct regulatory_request *reg_request, *lr;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001559
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001560 mutex_lock(&cfg80211_mutex);
1561 mutex_lock(&reg_mutex);
Johannes Bergc492db32012-12-06 16:29:25 +01001562 lr = get_last_request();
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001563
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001564 /* When last_request->processed becomes true this will be rescheduled */
Johannes Bergc492db32012-12-06 16:29:25 +01001565 if (lr && !lr->processed) {
Johannes Berg1a919312012-12-03 17:21:11 +01001566 REG_DBG_PRINT("Pending regulatory request, waiting for it to be processed...\n");
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001567 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001568 }
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001569
1570 spin_lock(&reg_requests_lock);
1571
1572 if (list_empty(&reg_requests_list)) {
1573 spin_unlock(&reg_requests_lock);
1574 goto out;
1575 }
1576
1577 reg_request = list_first_entry(&reg_requests_list,
1578 struct regulatory_request,
1579 list);
1580 list_del_init(&reg_request->list);
1581
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001582 spin_unlock(&reg_requests_lock);
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001583
Luis R. Rodriguez8848bef2011-12-20 12:23:36 -08001584 reg_process_hint(reg_request, reg_request->initiator);
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001585
1586out:
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001587 mutex_unlock(&reg_mutex);
1588 mutex_unlock(&cfg80211_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001589}
1590
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001591/* Processes beacon hints -- this has nothing to do with country IEs */
1592static void reg_process_pending_beacon_hints(void)
1593{
Johannes Berg79c97e92009-07-07 03:56:12 +02001594 struct cfg80211_registered_device *rdev;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001595 struct reg_beacon *pending_beacon, *tmp;
1596
1597 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguez0f500a52012-12-19 10:53:04 -08001598 mutex_lock(&reg_mutex);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001599
1600 /* This goes through the _pending_ beacon list */
1601 spin_lock_bh(&reg_pending_beacons_lock);
1602
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001603 list_for_each_entry_safe(pending_beacon, tmp,
1604 &reg_pending_beacons, list) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001605 list_del_init(&pending_beacon->list);
1606
1607 /* Applies the beacon hint to current wiphys */
Johannes Berg79c97e92009-07-07 03:56:12 +02001608 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1609 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001610
1611 /* Remembers the beacon hint for new wiphys or reg changes */
1612 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1613 }
1614
1615 spin_unlock_bh(&reg_pending_beacons_lock);
Luis R. Rodriguez0f500a52012-12-19 10:53:04 -08001616 mutex_unlock(&reg_mutex);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001617 mutex_unlock(&cfg80211_mutex);
1618}
1619
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001620static void reg_todo(struct work_struct *work)
1621{
1622 reg_process_pending_hints();
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001623 reg_process_pending_beacon_hints();
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001624}
1625
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001626static void queue_regulatory_request(struct regulatory_request *request)
1627{
Johannes Bergd4f2c882012-12-03 18:59:58 +01001628 request->alpha2[0] = toupper(request->alpha2[0]);
1629 request->alpha2[1] = toupper(request->alpha2[1]);
John W. Linvillec61029c2010-08-05 14:26:24 -04001630
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001631 spin_lock(&reg_requests_lock);
1632 list_add_tail(&request->list, &reg_requests_list);
1633 spin_unlock(&reg_requests_lock);
1634
1635 schedule_work(&reg_work);
1636}
1637
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001638/*
1639 * Core regulatory hint -- happens during cfg80211_init()
1640 * and when we restore regulatory settings.
1641 */
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001642static int regulatory_hint_core(const char *alpha2)
1643{
1644 struct regulatory_request *request;
1645
Johannes Berg1a919312012-12-03 17:21:11 +01001646 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001647 if (!request)
1648 return -ENOMEM;
1649
1650 request->alpha2[0] = alpha2[0];
1651 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001652 request->initiator = NL80211_REGDOM_SET_BY_CORE;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001653
Luis R. Rodriguez31e99722010-11-17 21:46:06 -08001654 queue_regulatory_request(request);
Luis R. Rodriguez5078b2e2009-05-13 17:04:42 -04001655
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001656 return 0;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001657}
1658
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001659/* User hints */
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07001660int regulatory_hint_user(const char *alpha2,
1661 enum nl80211_user_reg_hint_type user_reg_hint_type)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001662{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001663 struct regulatory_request *request;
1664
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001665 if (WARN_ON(!alpha2))
1666 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001667
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001668 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1669 if (!request)
1670 return -ENOMEM;
1671
Johannes Bergf4173762012-12-03 18:23:37 +01001672 request->wiphy_idx = WIPHY_IDX_INVALID;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001673 request->alpha2[0] = alpha2[0];
1674 request->alpha2[1] = alpha2[1];
Luis R. Rodrigueze12822e2010-01-04 11:37:39 -05001675 request->initiator = NL80211_REGDOM_SET_BY_USER;
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07001676 request->user_reg_hint_type = user_reg_hint_type;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001677
1678 queue_regulatory_request(request);
1679
1680 return 0;
1681}
1682
1683/* Driver hints */
1684int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1685{
1686 struct regulatory_request *request;
1687
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01001688 if (WARN_ON(!alpha2 || !wiphy))
1689 return -EINVAL;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001690
1691 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1692 if (!request)
1693 return -ENOMEM;
1694
1695 request->wiphy_idx = get_wiphy_idx(wiphy);
1696
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001697 request->alpha2[0] = alpha2[0];
1698 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001699 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001700
1701 queue_regulatory_request(request);
1702
1703 return 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001704}
1705EXPORT_SYMBOL(regulatory_hint);
1706
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001707/*
1708 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1709 * therefore cannot iterate over the rdev list here.
1710 */
Johannes Berg1a919312012-12-03 17:21:11 +01001711void regulatory_hint_11d(struct wiphy *wiphy, enum ieee80211_band band,
1712 const u8 *country_ie, u8 country_ie_len)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001713{
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001714 char alpha2[2];
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001715 enum environment_cap env = ENVIRON_ANY;
Johannes Bergc492db32012-12-06 16:29:25 +01001716 struct regulatory_request *request, *lr;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001717
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001718 mutex_lock(&reg_mutex);
Johannes Bergc492db32012-12-06 16:29:25 +01001719 lr = get_last_request();
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001720
Johannes Bergc492db32012-12-06 16:29:25 +01001721 if (unlikely(!lr))
Luis R. Rodriguez9828b012009-07-30 17:38:06 -07001722 goto out;
Luis R. Rodriguezd335fe62009-02-21 00:04:27 -05001723
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001724 /* IE len must be evenly divisible by 2 */
1725 if (country_ie_len & 0x01)
1726 goto out;
1727
1728 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1729 goto out;
1730
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001731 alpha2[0] = country_ie[0];
1732 alpha2[1] = country_ie[1];
1733
1734 if (country_ie[2] == 'I')
1735 env = ENVIRON_INDOOR;
1736 else if (country_ie[2] == 'O')
1737 env = ENVIRON_OUTDOOR;
1738
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001739 /*
Luis R. Rodriguez8b19e6c2009-07-30 17:38:09 -07001740 * We will run this only upon a successful connection on cfg80211.
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001741 * We leave conflict resolution to the workqueue, where can hold
1742 * cfg80211_mutex.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001743 */
Johannes Bergc492db32012-12-06 16:29:25 +01001744 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
1745 lr->wiphy_idx != WIPHY_IDX_INVALID)
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001746 goto out;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001747
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001748 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1749 if (!request)
Dan Carpenterf9f9b6e2010-07-22 13:26:50 +02001750 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001751
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001752 request->wiphy_idx = get_wiphy_idx(wiphy);
John W. Linville4f366c52010-07-15 14:57:33 -04001753 request->alpha2[0] = alpha2[0];
1754 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001755 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001756 request->country_ie_env = env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001757
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001758 queue_regulatory_request(request);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001759out:
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001760 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001761}
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001762
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001763static void restore_alpha2(char *alpha2, bool reset_user)
1764{
1765 /* indicates there is no alpha2 to consider for restoration */
1766 alpha2[0] = '9';
1767 alpha2[1] = '7';
1768
1769 /* The user setting has precedence over the module parameter */
1770 if (is_user_regdom_saved()) {
1771 /* Unless we're asked to ignore it and reset it */
1772 if (reset_user) {
Johannes Berg1a919312012-12-03 17:21:11 +01001773 REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001774 user_alpha2[0] = '9';
1775 user_alpha2[1] = '7';
1776
1777 /*
1778 * If we're ignoring user settings, we still need to
1779 * check the module parameter to ensure we put things
1780 * back as they were for a full restore.
1781 */
1782 if (!is_world_regdom(ieee80211_regdom)) {
Johannes Berg1a919312012-12-03 17:21:11 +01001783 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
1784 ieee80211_regdom[0], ieee80211_regdom[1]);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001785 alpha2[0] = ieee80211_regdom[0];
1786 alpha2[1] = ieee80211_regdom[1];
1787 }
1788 } else {
Johannes Berg1a919312012-12-03 17:21:11 +01001789 REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
1790 user_alpha2[0], user_alpha2[1]);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001791 alpha2[0] = user_alpha2[0];
1792 alpha2[1] = user_alpha2[1];
1793 }
1794 } else if (!is_world_regdom(ieee80211_regdom)) {
Johannes Berg1a919312012-12-03 17:21:11 +01001795 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
1796 ieee80211_regdom[0], ieee80211_regdom[1]);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001797 alpha2[0] = ieee80211_regdom[0];
1798 alpha2[1] = ieee80211_regdom[1];
1799 } else
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001800 REG_DBG_PRINT("Restoring regulatory settings\n");
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001801}
1802
Rajkumar Manoharan5ce543d2011-12-07 21:50:08 +05301803static void restore_custom_reg_settings(struct wiphy *wiphy)
1804{
1805 struct ieee80211_supported_band *sband;
1806 enum ieee80211_band band;
1807 struct ieee80211_channel *chan;
1808 int i;
1809
1810 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1811 sband = wiphy->bands[band];
1812 if (!sband)
1813 continue;
1814 for (i = 0; i < sband->n_channels; i++) {
1815 chan = &sband->channels[i];
1816 chan->flags = chan->orig_flags;
1817 chan->max_antenna_gain = chan->orig_mag;
1818 chan->max_power = chan->orig_mpwr;
Paul Stewart899852a2012-08-01 16:54:42 -07001819 chan->beacon_found = false;
Rajkumar Manoharan5ce543d2011-12-07 21:50:08 +05301820 }
1821 }
1822}
1823
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001824/*
1825 * Restoring regulatory settings involves ingoring any
1826 * possibly stale country IE information and user regulatory
1827 * settings if so desired, this includes any beacon hints
1828 * learned as we could have traveled outside to another country
1829 * after disconnection. To restore regulatory settings we do
1830 * exactly what we did at bootup:
1831 *
1832 * - send a core regulatory hint
1833 * - send a user regulatory hint if applicable
1834 *
1835 * Device drivers that send a regulatory hint for a specific country
1836 * keep their own regulatory domain on wiphy->regd so that does does
1837 * not need to be remembered.
1838 */
1839static void restore_regulatory_settings(bool reset_user)
1840{
1841 char alpha2[2];
Dmitry Shmidtcee0bec2011-12-19 12:32:21 -08001842 char world_alpha2[2];
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001843 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001844 struct regulatory_request *reg_request, *tmp;
1845 LIST_HEAD(tmp_reg_req_list);
Rajkumar Manoharan5ce543d2011-12-07 21:50:08 +05301846 struct cfg80211_registered_device *rdev;
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001847
1848 mutex_lock(&cfg80211_mutex);
1849 mutex_lock(&reg_mutex);
1850
Johannes Berg379b82f2012-12-06 15:44:07 +01001851 reset_regdomains(true, cfg80211_world_regdom);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001852 restore_alpha2(alpha2, reset_user);
1853
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001854 /*
1855 * If there's any pending requests we simply
1856 * stash them to a temporary pending queue and
1857 * add then after we've restored regulatory
1858 * settings.
1859 */
1860 spin_lock(&reg_requests_lock);
Johannes Bergfea9bce2012-12-03 17:32:01 +01001861 list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
1862 if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER)
1863 continue;
1864 list_move_tail(&reg_request->list, &tmp_reg_req_list);
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001865 }
1866 spin_unlock(&reg_requests_lock);
1867
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001868 /* Clear beacon hints */
1869 spin_lock_bh(&reg_pending_beacons_lock);
Johannes Bergfea9bce2012-12-03 17:32:01 +01001870 list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
1871 list_del(&reg_beacon->list);
1872 kfree(reg_beacon);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001873 }
1874 spin_unlock_bh(&reg_pending_beacons_lock);
1875
Johannes Bergfea9bce2012-12-03 17:32:01 +01001876 list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
1877 list_del(&reg_beacon->list);
1878 kfree(reg_beacon);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001879 }
1880
1881 /* First restore to the basic regulatory settings */
Johannes Berg379b82f2012-12-06 15:44:07 +01001882 world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
1883 world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001884
Rajkumar Manoharan5ce543d2011-12-07 21:50:08 +05301885 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1886 if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY)
1887 restore_custom_reg_settings(&rdev->wiphy);
1888 }
1889
Dmitry Shmidtcee0bec2011-12-19 12:32:21 -08001890 regulatory_hint_core(world_alpha2);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001891
1892 /*
1893 * This restores the ieee80211_regdom module parameter
1894 * preference or the last user requested regulatory
1895 * settings, user regulatory settings takes precedence.
1896 */
1897 if (is_an_alpha2(alpha2))
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07001898 regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001899
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001900 spin_lock(&reg_requests_lock);
Johannes Berg11cff962012-12-03 18:56:41 +01001901 list_splice_tail_init(&tmp_reg_req_list, &reg_requests_list);
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001902 spin_unlock(&reg_requests_lock);
1903
1904 mutex_unlock(&reg_mutex);
1905 mutex_unlock(&cfg80211_mutex);
1906
1907 REG_DBG_PRINT("Kicking the queue\n");
1908
1909 schedule_work(&reg_work);
1910}
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001911
1912void regulatory_hint_disconnect(void)
1913{
Johannes Berg1a919312012-12-03 17:21:11 +01001914 REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001915 restore_regulatory_settings(false);
1916}
1917
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001918static bool freq_is_chan_12_13_14(u16 freq)
1919{
Bruno Randolf59eb21a2011-01-17 13:37:28 +09001920 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
1921 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
1922 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001923 return true;
1924 return false;
1925}
1926
Luis R. Rodriguez3ebfa6e2012-12-19 10:53:02 -08001927static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
1928{
1929 struct reg_beacon *pending_beacon;
1930
1931 list_for_each_entry(pending_beacon, &reg_pending_beacons, list)
1932 if (beacon_chan->center_freq ==
1933 pending_beacon->chan.center_freq)
1934 return true;
1935 return false;
1936}
1937
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001938int regulatory_hint_found_beacon(struct wiphy *wiphy,
1939 struct ieee80211_channel *beacon_chan,
1940 gfp_t gfp)
1941{
1942 struct reg_beacon *reg_beacon;
Luis R. Rodriguez3ebfa6e2012-12-19 10:53:02 -08001943 bool processing;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001944
Johannes Berg1a919312012-12-03 17:21:11 +01001945 if (beacon_chan->beacon_found ||
1946 beacon_chan->flags & IEEE80211_CHAN_RADAR ||
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001947 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
Johannes Berg1a919312012-12-03 17:21:11 +01001948 !freq_is_chan_12_13_14(beacon_chan->center_freq)))
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001949 return 0;
1950
Luis R. Rodriguez3ebfa6e2012-12-19 10:53:02 -08001951 spin_lock_bh(&reg_pending_beacons_lock);
1952 processing = pending_reg_beacon(beacon_chan);
1953 spin_unlock_bh(&reg_pending_beacons_lock);
1954
1955 if (processing)
1956 return 0;
1957
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001958 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1959 if (!reg_beacon)
1960 return -ENOMEM;
1961
Johannes Berg1a919312012-12-03 17:21:11 +01001962 REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
Luis R. Rodriguez4113f752010-01-04 11:50:11 -05001963 beacon_chan->center_freq,
1964 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1965 wiphy_name(wiphy));
1966
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001967 memcpy(&reg_beacon->chan, beacon_chan,
Johannes Berg1a919312012-12-03 17:21:11 +01001968 sizeof(struct ieee80211_channel));
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001969
1970 /*
1971 * Since we can be called from BH or and non-BH context
1972 * we must use spin_lock_bh()
1973 */
1974 spin_lock_bh(&reg_pending_beacons_lock);
1975 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1976 spin_unlock_bh(&reg_pending_beacons_lock);
1977
1978 schedule_work(&reg_work);
1979
1980 return 0;
1981}
1982
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001983static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001984{
1985 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001986 const struct ieee80211_reg_rule *reg_rule = NULL;
1987 const struct ieee80211_freq_range *freq_range = NULL;
1988 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001989
Luis R. Rodriguez66533252011-12-20 12:23:37 -08001990 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001991
1992 for (i = 0; i < rd->n_reg_rules; i++) {
1993 reg_rule = &rd->reg_rules[i];
1994 freq_range = &reg_rule->freq_range;
1995 power_rule = &reg_rule->power_rule;
1996
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001997 /*
1998 * There may not be documentation for max antenna gain
1999 * in certain regions
2000 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002001 if (power_rule->max_antenna_gain)
Luis R. Rodriguez66533252011-12-20 12:23:37 -08002002 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002003 freq_range->start_freq_khz,
2004 freq_range->end_freq_khz,
2005 freq_range->max_bandwidth_khz,
2006 power_rule->max_antenna_gain,
2007 power_rule->max_eirp);
2008 else
Luis R. Rodriguez66533252011-12-20 12:23:37 -08002009 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002010 freq_range->start_freq_khz,
2011 freq_range->end_freq_khz,
2012 freq_range->max_bandwidth_khz,
2013 power_rule->max_eirp);
2014 }
2015}
2016
Luis R. Rodriguez8b60b072011-10-11 10:59:02 -07002017bool reg_supported_dfs_region(u8 dfs_region)
2018{
2019 switch (dfs_region) {
2020 case NL80211_DFS_UNSET:
2021 case NL80211_DFS_FCC:
2022 case NL80211_DFS_ETSI:
2023 case NL80211_DFS_JP:
2024 return true;
2025 default:
2026 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2027 dfs_region);
2028 return false;
2029 }
2030}
2031
2032static void print_dfs_region(u8 dfs_region)
2033{
2034 if (!dfs_region)
2035 return;
2036
2037 switch (dfs_region) {
2038 case NL80211_DFS_FCC:
2039 pr_info(" DFS Master region FCC");
2040 break;
2041 case NL80211_DFS_ETSI:
2042 pr_info(" DFS Master region ETSI");
2043 break;
2044 case NL80211_DFS_JP:
2045 pr_info(" DFS Master region JP");
2046 break;
2047 default:
Johannes Berg1a919312012-12-03 17:21:11 +01002048 pr_info(" DFS Master region Unknown");
Luis R. Rodriguez8b60b072011-10-11 10:59:02 -07002049 break;
2050 }
2051}
2052
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002053static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002054{
Johannes Bergc492db32012-12-06 16:29:25 +01002055 struct regulatory_request *lr = get_last_request();
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002056
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002057 if (is_intersected_alpha2(rd->alpha2)) {
Johannes Bergc492db32012-12-06 16:29:25 +01002058 if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Johannes Berg79c97e92009-07-07 03:56:12 +02002059 struct cfg80211_registered_device *rdev;
Johannes Bergc492db32012-12-06 16:29:25 +01002060 rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
Johannes Berg79c97e92009-07-07 03:56:12 +02002061 if (rdev) {
Joe Perchese9c02682010-11-16 19:56:49 -08002062 pr_info("Current regulatory domain updated by AP to: %c%c\n",
Johannes Berg79c97e92009-07-07 03:56:12 +02002063 rdev->country_ie_alpha2[0],
2064 rdev->country_ie_alpha2[1]);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002065 } else
Joe Perchese9c02682010-11-16 19:56:49 -08002066 pr_info("Current regulatory domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002067 } else
Joe Perchese9c02682010-11-16 19:56:49 -08002068 pr_info("Current regulatory domain intersected:\n");
Johannes Berg1a919312012-12-03 17:21:11 +01002069 } else if (is_world_regdom(rd->alpha2)) {
Joe Perchese9c02682010-11-16 19:56:49 -08002070 pr_info("World regulatory domain updated:\n");
Johannes Berg1a919312012-12-03 17:21:11 +01002071 } else {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002072 if (is_unknown_alpha2(rd->alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -08002073 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07002074 else {
Johannes Bergc492db32012-12-06 16:29:25 +01002075 if (reg_request_cell_base(lr))
Johannes Berg1a919312012-12-03 17:21:11 +01002076 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07002077 rd->alpha2[0], rd->alpha2[1]);
2078 else
Johannes Berg1a919312012-12-03 17:21:11 +01002079 pr_info("Regulatory domain changed to country: %c%c\n",
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07002080 rd->alpha2[0], rd->alpha2[1]);
2081 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002082 }
Johannes Berg1a919312012-12-03 17:21:11 +01002083
Luis R. Rodriguez8b60b072011-10-11 10:59:02 -07002084 print_dfs_region(rd->dfs_region);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002085 print_rd_rules(rd);
2086}
2087
Johannes Berg2df78162008-10-28 16:49:41 +01002088static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002089{
Joe Perchese9c02682010-11-16 19:56:49 -08002090 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002091 print_rd_rules(rd);
2092}
2093
Johannes Bergd2372b32008-10-24 20:32:20 +02002094/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002095static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002096{
Johannes Berge9763c32012-12-03 16:59:46 +01002097 const struct ieee80211_regdomain *regd;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002098 const struct ieee80211_regdomain *intersected_rd = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002099 struct wiphy *request_wiphy;
Johannes Bergc492db32012-12-06 16:29:25 +01002100 struct regulatory_request *lr = get_last_request();
Johannes Berg6913b492012-12-04 00:48:59 +01002101
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002102 /* Some basic sanity checks first */
2103
Johannes Berg6913b492012-12-04 00:48:59 +01002104 if (!reg_is_valid_request(rd->alpha2))
2105 return -EINVAL;
2106
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002107 if (is_world_regdom(rd->alpha2)) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002108 update_world_regdomain(rd);
2109 return 0;
2110 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002111
2112 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
Johannes Berg1a919312012-12-03 17:21:11 +01002113 !is_unknown_alpha2(rd->alpha2))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002114 return -EINVAL;
2115
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002116 /*
2117 * Lets only bother proceeding on the same alpha2 if the current
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002118 * rd is non static (it means CRDA was present and was used last)
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002119 * and the pending request came in from a country IE
2120 */
Johannes Bergc492db32012-12-06 16:29:25 +01002121 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002122 /*
2123 * If someone else asked us to change the rd lets only bother
2124 * checking if the alpha2 changes if CRDA was already called
2125 */
John W. Linvillebaeb66f2009-12-18 17:59:02 -05002126 if (!regdom_changes(rd->alpha2))
Kalle Valo95908532012-07-12 15:33:58 +03002127 return -EALREADY;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002128 }
2129
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002130 /*
2131 * Now lets set the regulatory domain, update all driver channels
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002132 * and finally inform them of what we have done, in case they want
2133 * to review or adjust their own settings based on their own
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002134 * internal EEPROM data
2135 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002136
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08002137 if (!is_valid_rd(rd)) {
Joe Perchese9c02682010-11-16 19:56:49 -08002138 pr_err("Invalid regulatory domain detected:\n");
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08002139 print_regdomain_info(rd);
2140 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002141 }
2142
Johannes Bergc492db32012-12-06 16:29:25 +01002143 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
Luis R. Rodriguez0bac71a2011-11-28 16:47:16 -05002144 if (!request_wiphy &&
Johannes Bergc492db32012-12-06 16:29:25 +01002145 (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
2146 lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) {
Luis R. Rodriguez0bac71a2011-11-28 16:47:16 -05002147 schedule_delayed_work(&reg_timeout, 0);
Johannes Bergde3584b2011-11-21 10:44:00 +01002148 return -ENODEV;
2149 }
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002150
Johannes Bergc492db32012-12-06 16:29:25 +01002151 if (!lr->intersect) {
2152 if (lr->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
Johannes Berg379b82f2012-12-06 15:44:07 +01002153 reset_regdomains(false, rd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002154 return 0;
2155 }
2156
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002157 /*
2158 * For a driver hint, lets copy the regulatory domain the
2159 * driver wanted to the wiphy to deal with conflicts
2160 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002161
Luis R. Rodriguez558f6d32009-06-08 18:54:37 -07002162 /*
2163 * Userspace could have sent two replies with only
2164 * one kernel request.
2165 */
2166 if (request_wiphy->regd)
2167 return -EALREADY;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002168
Johannes Berge9763c32012-12-03 16:59:46 +01002169 regd = reg_copy_regd(rd);
2170 if (IS_ERR(regd))
2171 return PTR_ERR(regd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002172
Johannes Berg458f4f92012-12-06 15:47:38 +01002173 rcu_assign_pointer(request_wiphy->regd, regd);
Johannes Berg379b82f2012-12-06 15:44:07 +01002174 reset_regdomains(false, rd);
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002175 return 0;
2176 }
2177
2178 /* Intersection requires a bit more work */
2179
Johannes Bergc492db32012-12-06 16:29:25 +01002180 if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Johannes Berg458f4f92012-12-06 15:47:38 +01002181 intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002182 if (!intersected_rd)
2183 return -EINVAL;
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002184
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002185 /*
2186 * We can trash what CRDA provided now.
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002187 * However if a driver requested this specific regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002188 * domain we keep it for its private use
2189 */
Johannes Bergc492db32012-12-06 16:29:25 +01002190 if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER)
Johannes Berg458f4f92012-12-06 15:47:38 +01002191 rcu_assign_pointer(request_wiphy->regd, rd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002192 else
2193 kfree(rd);
2194
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002195 rd = NULL;
2196
Johannes Berg379b82f2012-12-06 15:44:07 +01002197 reset_regdomains(false, intersected_rd);
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002198
2199 return 0;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002200 }
2201
Alan Coxf3baed52012-09-17 11:54:15 +01002202 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002203}
2204
2205
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002206/*
2207 * Use this call to set the current regulatory domain. Conflicts with
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002208 * multiple drivers can be ironed out later. Caller must've already
Johannes Berg458f4f92012-12-06 15:47:38 +01002209 * kmalloc'd the rd structure.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002210 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002211int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002212{
Johannes Bergc492db32012-12-06 16:29:25 +01002213 struct regulatory_request *lr;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002214 int r;
2215
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002216 mutex_lock(&reg_mutex);
Johannes Bergc492db32012-12-06 16:29:25 +01002217 lr = get_last_request();
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002218
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002219 /* Note that this doesn't update the wiphys, this is done below */
2220 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +02002221 if (r) {
Kalle Valo95908532012-07-12 15:33:58 +03002222 if (r == -EALREADY)
2223 reg_set_request_processed();
2224
Johannes Bergd2372b32008-10-24 20:32:20 +02002225 kfree(rd);
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01002226 goto out;
Johannes Bergd2372b32008-10-24 20:32:20 +02002227 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002228
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002229 /* This would make this whole thing pointless */
Johannes Bergc492db32012-12-06 16:29:25 +01002230 if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom())) {
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01002231 r = -EINVAL;
2232 goto out;
2233 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002234
2235 /* update all wiphys now with the new established regulatory domain */
Johannes Bergc492db32012-12-06 16:29:25 +01002236 update_all_wiphy_regulatory(lr->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002237
Johannes Berg458f4f92012-12-06 15:47:38 +01002238 print_regdomain(get_cfg80211_regdom());
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002239
Johannes Bergc492db32012-12-06 16:29:25 +01002240 nl80211_send_reg_change_event(lr);
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04002241
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08002242 reg_set_request_processed();
2243
Johannes Bergfdc9d7b2012-12-03 18:36:09 +01002244 out:
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002245 mutex_unlock(&reg_mutex);
2246
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002247 return r;
2248}
2249
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002250#ifdef CONFIG_HOTPLUG
2251int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2252{
Johannes Berg4a484cf2013-01-09 10:22:07 +01002253 struct regulatory_request *lr;
2254 u8 alpha2[2];
2255 bool add = false;
Johannes Bergc492db32012-12-06 16:29:25 +01002256
Johannes Berg4a484cf2013-01-09 10:22:07 +01002257 rcu_read_lock();
2258 lr = get_last_request();
Johannes Bergc492db32012-12-06 16:29:25 +01002259 if (lr && !lr->processed) {
Johannes Berg4a484cf2013-01-09 10:22:07 +01002260 memcpy(alpha2, lr->alpha2, 2);
2261 add = true;
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002262 }
Johannes Berg4a484cf2013-01-09 10:22:07 +01002263 rcu_read_unlock();
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002264
Johannes Berg4a484cf2013-01-09 10:22:07 +01002265 if (add)
2266 return add_uevent_var(env, "COUNTRY=%c%c",
2267 alpha2[0], alpha2[1]);
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002268 return 0;
2269}
2270#else
2271int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2272{
2273 return -ENODEV;
2274}
2275#endif /* CONFIG_HOTPLUG */
2276
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07002277void wiphy_regulatory_register(struct wiphy *wiphy)
2278{
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07002279 mutex_lock(&reg_mutex);
2280
2281 if (!reg_dev_ignore_cell_hint(wiphy))
2282 reg_num_devs_support_basehint++;
2283
Luis R. Rodriguez14cdf112012-07-12 11:49:21 -07002284 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
Luis R. Rodriguezf8a1c772012-07-12 11:49:20 -07002285
Luis R. Rodriguez14cdf112012-07-12 11:49:21 -07002286 mutex_unlock(&reg_mutex);
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07002287}
2288
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002289/* Caller must hold cfg80211_mutex */
Luis R. Rodriguezbfead082012-07-12 11:49:19 -07002290void wiphy_regulatory_deregister(struct wiphy *wiphy)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002291{
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04002292 struct wiphy *request_wiphy = NULL;
Johannes Bergc492db32012-12-06 16:29:25 +01002293 struct regulatory_request *lr;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002294
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002295 mutex_lock(&reg_mutex);
Johannes Bergc492db32012-12-06 16:29:25 +01002296 lr = get_last_request();
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002297
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07002298 if (!reg_dev_ignore_cell_hint(wiphy))
2299 reg_num_devs_support_basehint--;
2300
Johannes Berg458f4f92012-12-06 15:47:38 +01002301 rcu_free_regdom(get_wiphy_regdom(wiphy));
2302 rcu_assign_pointer(wiphy->regd, NULL);
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002303
Johannes Bergc492db32012-12-06 16:29:25 +01002304 if (lr)
2305 request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002306
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002307 if (!request_wiphy || request_wiphy != wiphy)
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002308 goto out;
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002309
Johannes Bergc492db32012-12-06 16:29:25 +01002310 lr->wiphy_idx = WIPHY_IDX_INVALID;
2311 lr->country_ie_env = ENVIRON_ANY;
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002312out:
2313 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002314}
2315
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002316static void reg_timeout_work(struct work_struct *work)
2317{
Johannes Berg1a919312012-12-03 17:21:11 +01002318 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002319 restore_regulatory_settings(true);
2320}
2321
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002322int __init regulatory_init(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002323{
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002324 int err = 0;
Johannes Berg734366d2008-09-15 10:56:48 +02002325
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002326 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2327 if (IS_ERR(reg_pdev))
2328 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002329
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002330 reg_pdev->dev.type = &reg_device_type;
2331
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002332 spin_lock_init(&reg_requests_lock);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002333 spin_lock_init(&reg_pending_beacons_lock);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002334
Luis R. Rodriguez80007ef2012-03-23 07:23:31 -07002335 reg_regdb_size_check();
2336
Johannes Berg458f4f92012-12-06 15:47:38 +01002337 rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +02002338
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05002339 user_alpha2[0] = '9';
2340 user_alpha2[1] = '7';
2341
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002342 /* We always try to get an update for the static regdomain */
Johannes Berg458f4f92012-12-06 15:47:38 +01002343 err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002344 if (err) {
2345 if (err == -ENOMEM)
2346 return err;
2347 /*
2348 * N.B. kobject_uevent_env() can fail mainly for when we're out
2349 * memory which is handled and propagated appropriately above
2350 * but it can also fail during a netlink_broadcast() or during
2351 * early boot for call_usermodehelper(). For now treat these
2352 * errors as non-fatal.
2353 */
Joe Perchese9c02682010-11-16 19:56:49 -08002354 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002355 }
Johannes Berg734366d2008-09-15 10:56:48 +02002356
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002357 /*
2358 * Finally, if the user set the module parameter treat it
2359 * as a user hint.
2360 */
2361 if (!is_world_regdom(ieee80211_regdom))
Luis R. Rodriguez57b5ce02012-07-12 11:49:18 -07002362 regulatory_hint_user(ieee80211_regdom,
2363 NL80211_USER_REG_HINT_USER);
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002364
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002365 return 0;
2366}
2367
Johannes Berg1a919312012-12-03 17:21:11 +01002368void regulatory_exit(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002369{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002370 struct regulatory_request *reg_request, *tmp;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002371 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002372
2373 cancel_work_sync(&reg_work);
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002374 cancel_delayed_work_sync(&reg_timeout);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002375
Johannes Berg9027b142012-12-03 17:59:24 +01002376 /* Lock to suppress warnings */
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002377 mutex_lock(&reg_mutex);
Johannes Berg379b82f2012-12-06 15:44:07 +01002378 reset_regdomains(true, NULL);
Johannes Berg9027b142012-12-03 17:59:24 +01002379 mutex_unlock(&reg_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +02002380
Luis R. Rodriguez58ebacc2011-11-08 14:28:06 -08002381 dev_set_uevent_suppress(&reg_pdev->dev, true);
Johannes Bergf6037d02008-10-21 11:01:33 +02002382
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002383 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002384
Johannes Bergfea9bce2012-12-03 17:32:01 +01002385 list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
2386 list_del(&reg_beacon->list);
2387 kfree(reg_beacon);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002388 }
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002389
Johannes Bergfea9bce2012-12-03 17:32:01 +01002390 list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
2391 list_del(&reg_beacon->list);
2392 kfree(reg_beacon);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002393 }
2394
Johannes Bergfea9bce2012-12-03 17:32:01 +01002395 list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
2396 list_del(&reg_request->list);
2397 kfree(reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002398 }
Johannes Berg8318d782008-01-24 19:38:38 +01002399}