blob: 02751dbc5a97fab55abdefb9936dfc24c2d4ef22 [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. Rodriguezb2e1b302008-09-09 23:19:48 -07005 * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com>
Johannes Berg8318d782008-01-24 19:38:38 +01006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070012/**
13 * DOC: Wireless regulatory infrastructure
Johannes Berg8318d782008-01-24 19:38:38 +010014 *
15 * The usual implementation is for a driver to read a device EEPROM to
16 * determine which regulatory domain it should be operating under, then
17 * looking up the allowable channels in a driver-local table and finally
18 * registering those channels in the wiphy structure.
19 *
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070020 * Another set of compliance enforcement is for drivers to use their
21 * own compliance limits which can be stored on the EEPROM. The host
22 * driver or firmware may ensure these are used.
23 *
24 * In addition to all this we provide an extra layer of regulatory
25 * conformance. For drivers which do not have any regulatory
26 * information CRDA provides the complete regulatory solution.
27 * For others it provides a community effort on further restrictions
28 * to enhance compliance.
29 *
30 * Note: When number of rules --> infinity we will not be able to
31 * index on alpha2 any more, instead we'll probably have to
32 * rely on some SHA1 checksum of the regdomain for example.
33 *
Johannes Berg8318d782008-01-24 19:38:38 +010034 */
Joe Perchese9c02682010-11-16 19:56:49 -080035
36#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
37
Johannes Berg8318d782008-01-24 19:38:38 +010038#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090039#include <linux/slab.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070040#include <linux/list.h>
41#include <linux/random.h>
John W. Linvillec61029c2010-08-05 14:26:24 -040042#include <linux/ctype.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070043#include <linux/nl80211.h>
44#include <linux/platform_device.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070045#include <net/cfg80211.h>
Johannes Berg8318d782008-01-24 19:38:38 +010046#include "core.h"
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070047#include "reg.h"
John W. Linville3b377ea2009-12-18 17:59:01 -050048#include "regdb.h"
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -040049#include "nl80211.h"
Johannes Berg8318d782008-01-24 19:38:38 +010050
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050051#ifdef CONFIG_CFG80211_REG_DEBUG
John W. Linville82711952010-01-05 17:57:20 -050052#define REG_DBG_PRINT(format, args...) \
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050053 do { \
Joe Perchese9c02682010-11-16 19:56:49 -080054 printk(KERN_DEBUG pr_fmt(format), ##args); \
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050055 } while (0)
56#else
John W. Linville82711952010-01-05 17:57:20 -050057#define REG_DBG_PRINT(args...)
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050058#endif
59
Luis R. Rodriguez5166ccd2008-10-30 13:33:56 -070060/* Receipt of information from last regulatory request */
Johannes Bergf6037d02008-10-21 11:01:33 +020061static struct regulatory_request *last_request;
Johannes Berg734366d2008-09-15 10:56:48 +020062
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070063/* To trigger userspace events */
64static struct platform_device *reg_pdev;
Johannes Berg8318d782008-01-24 19:38:38 +010065
Scott James Remnant4d9d88d2011-03-08 10:45:30 -080066static struct device_type reg_device_type = {
67 .uevent = reg_device_uevent,
68};
69
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050070/*
71 * Central wireless core regulatory domains, we only need two,
Johannes Berg734366d2008-09-15 10:56:48 +020072 * the current one and a world regulatory domain in case we have no
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050073 * information to give us an alpha2
74 */
Luis R. Rodriguezf1303472009-01-30 09:26:42 -080075const struct ieee80211_regdomain *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +020076
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050077/*
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070078 * Protects static reg.c components:
79 * - cfg80211_world_regdom
80 * - cfg80211_regdom
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070081 * - last_request
82 */
John W. Linville670b7f12010-06-24 11:26:31 -040083static DEFINE_MUTEX(reg_mutex);
Johannes Berg46a5eba2010-09-15 13:28:15 +020084
85static inline void assert_reg_lock(void)
86{
87 lockdep_assert_held(&reg_mutex);
88}
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070089
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -050090/* Used to queue up regulatory hints */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -050091static LIST_HEAD(reg_requests_list);
92static spinlock_t reg_requests_lock;
93
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -050094/* Used to queue up beacon hints for review */
95static LIST_HEAD(reg_pending_beacons);
96static spinlock_t reg_pending_beacons_lock;
97
98/* Used to keep track of processed beacon hints */
99static LIST_HEAD(reg_beacon_list);
100
101struct reg_beacon {
102 struct list_head list;
103 struct ieee80211_channel chan;
104};
105
Luis R. Rodriguezf333a7a2010-11-17 21:46:07 -0800106static void reg_todo(struct work_struct *work);
107static DECLARE_WORK(reg_work, reg_todo);
108
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -0700109static void reg_timeout_work(struct work_struct *work);
110static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
111
Johannes Berg734366d2008-09-15 10:56:48 +0200112/* We keep a static world regulatory domain in case of the absence of CRDA */
113static const struct ieee80211_regdomain world_regdom = {
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800114 .n_reg_rules = 5,
Johannes Berg734366d2008-09-15 10:56:48 +0200115 .alpha2 = "00",
116 .reg_rules = {
Luis R. Rodriguez68798a62009-02-21 00:20:37 -0500117 /* IEEE 802.11b/g, channels 1..11 */
118 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800119 /* IEEE 802.11b/g, channels 12..13. No HT40
120 * channel fits here. */
121 REG_RULE(2467-10, 2472+10, 20, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500122 NL80211_RRF_PASSIVE_SCAN |
123 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800124 /* IEEE 802.11 channel 14 - Only JP enables
125 * this and for 802.11b only */
126 REG_RULE(2484-10, 2484+10, 20, 6, 20,
127 NL80211_RRF_PASSIVE_SCAN |
128 NL80211_RRF_NO_IBSS |
129 NL80211_RRF_NO_OFDM),
130 /* IEEE 802.11a, channel 36..48 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800131 REG_RULE(5180-10, 5240+10, 40, 6, 20,
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800132 NL80211_RRF_PASSIVE_SCAN |
133 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500134
135 /* NB: 5260 MHz - 5700 MHz requies DFS */
136
137 /* IEEE 802.11a, channel 149..165 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800138 REG_RULE(5745-10, 5825+10, 40, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500139 NL80211_RRF_PASSIVE_SCAN |
140 NL80211_RRF_NO_IBSS),
Johannes Berg734366d2008-09-15 10:56:48 +0200141 }
142};
143
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200144static const struct ieee80211_regdomain *cfg80211_world_regdom =
145 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200146
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400147static char *ieee80211_regdom = "00";
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500148static char user_alpha2[2];
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400149
Johannes Berg734366d2008-09-15 10:56:48 +0200150module_param(ieee80211_regdom, charp, 0444);
151MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
152
Johannes Berg734366d2008-09-15 10:56:48 +0200153static void reset_regdomains(void)
154{
Johannes Berg942b25c2008-09-15 11:26:47 +0200155 /* avoid freeing static information or freeing something twice */
156 if (cfg80211_regdomain == cfg80211_world_regdom)
157 cfg80211_regdomain = NULL;
158 if (cfg80211_world_regdom == &world_regdom)
159 cfg80211_world_regdom = NULL;
160 if (cfg80211_regdomain == &world_regdom)
161 cfg80211_regdomain = NULL;
Johannes Berg942b25c2008-09-15 11:26:47 +0200162
163 kfree(cfg80211_regdomain);
164 kfree(cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200165
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200166 cfg80211_world_regdom = &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200167 cfg80211_regdomain = NULL;
168}
169
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500170/*
171 * Dynamic world regulatory domain requested by the wireless
172 * core upon initialization
173 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200174static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200175{
Johannes Bergf6037d02008-10-21 11:01:33 +0200176 BUG_ON(!last_request);
Johannes Berg734366d2008-09-15 10:56:48 +0200177
178 reset_regdomains();
179
180 cfg80211_world_regdom = rd;
181 cfg80211_regdomain = rd;
182}
Johannes Berg734366d2008-09-15 10:56:48 +0200183
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200184bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100185{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700186 if (!alpha2)
187 return false;
188 if (alpha2[0] == '0' && alpha2[1] == '0')
189 return true;
190 return false;
Johannes Berg8318d782008-01-24 19:38:38 +0100191}
192
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200193static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700194{
195 if (!alpha2)
196 return false;
197 if (alpha2[0] != 0 && alpha2[1] != 0)
198 return true;
199 return false;
200}
Johannes Berg8318d782008-01-24 19:38:38 +0100201
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200202static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700203{
204 if (!alpha2)
205 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500206 /*
207 * Special case where regulatory domain was built by driver
208 * but a specific alpha2 cannot be determined
209 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700210 if (alpha2[0] == '9' && alpha2[1] == '9')
211 return true;
212 return false;
213}
214
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800215static bool is_intersected_alpha2(const char *alpha2)
216{
217 if (!alpha2)
218 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500219 /*
220 * Special case where regulatory domain is the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800221 * result of an intersection between two regulatory domain
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500222 * structures
223 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800224 if (alpha2[0] == '9' && alpha2[1] == '8')
225 return true;
226 return false;
227}
228
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200229static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700230{
231 if (!alpha2)
232 return false;
John W. Linvillec61029c2010-08-05 14:26:24 -0400233 if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700234 return true;
235 return false;
236}
237
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200238static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700239{
240 if (!alpha2_x || !alpha2_y)
241 return false;
242 if (alpha2_x[0] == alpha2_y[0] &&
243 alpha2_x[1] == alpha2_y[1])
244 return true;
245 return false;
246}
247
Luis R. Rodriguez69b15722009-02-21 00:04:33 -0500248static bool regdom_changes(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700249{
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500250 assert_cfg80211_lock();
251
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700252 if (!cfg80211_regdomain)
253 return true;
254 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
255 return false;
256 return true;
257}
258
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500259/*
260 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
261 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
262 * has ever been issued.
263 */
264static bool is_user_regdom_saved(void)
265{
266 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
267 return false;
268
269 /* This would indicate a mistake on the design */
270 if (WARN((!is_world_regdom(user_alpha2) &&
271 !is_an_alpha2(user_alpha2)),
272 "Unexpected user alpha2: %c%c\n",
273 user_alpha2[0],
274 user_alpha2[1]))
275 return false;
276
277 return true;
278}
279
John W. Linville3b377ea2009-12-18 17:59:01 -0500280static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
281 const struct ieee80211_regdomain *src_regd)
282{
283 struct ieee80211_regdomain *regd;
284 int size_of_regd = 0;
285 unsigned int i;
286
287 size_of_regd = sizeof(struct ieee80211_regdomain) +
288 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
289
290 regd = kzalloc(size_of_regd, GFP_KERNEL);
291 if (!regd)
292 return -ENOMEM;
293
294 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
295
296 for (i = 0; i < src_regd->n_reg_rules; i++)
297 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
298 sizeof(struct ieee80211_reg_rule));
299
300 *dst_regd = regd;
301 return 0;
302}
303
304#ifdef CONFIG_CFG80211_INTERNAL_REGDB
305struct reg_regdb_search_request {
306 char alpha2[2];
307 struct list_head list;
308};
309
310static LIST_HEAD(reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400311static DEFINE_MUTEX(reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500312
313static void reg_regdb_search(struct work_struct *work)
314{
315 struct reg_regdb_search_request *request;
316 const struct ieee80211_regdomain *curdom, *regdom;
317 int i, r;
318
John W. Linville368d06f2010-03-16 15:40:59 -0400319 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500320 while (!list_empty(&reg_regdb_search_list)) {
321 request = list_first_entry(&reg_regdb_search_list,
322 struct reg_regdb_search_request,
323 list);
324 list_del(&request->list);
325
326 for (i=0; i<reg_regdb_size; i++) {
327 curdom = reg_regdb[i];
328
329 if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
330 r = reg_copy_regd(&regdom, curdom);
331 if (r)
332 break;
John W. Linville3b377ea2009-12-18 17:59:01 -0500333 mutex_lock(&cfg80211_mutex);
334 set_regdom(regdom);
335 mutex_unlock(&cfg80211_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500336 break;
337 }
338 }
339
340 kfree(request);
341 }
John W. Linville368d06f2010-03-16 15:40:59 -0400342 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500343}
344
345static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
346
347static void reg_regdb_query(const char *alpha2)
348{
349 struct reg_regdb_search_request *request;
350
351 if (!alpha2)
352 return;
353
354 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
355 if (!request)
356 return;
357
358 memcpy(request->alpha2, alpha2, 2);
359
John W. Linville368d06f2010-03-16 15:40:59 -0400360 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500361 list_add_tail(&request->list, &reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400362 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500363
364 schedule_work(&reg_regdb_work);
365}
366#else
367static inline void reg_regdb_query(const char *alpha2) {}
368#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
369
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500370/*
371 * This lets us keep regulatory code which is updated on a regulatory
Scott James Remnant4d9d88d2011-03-08 10:45:30 -0800372 * basis in userspace. Country information is filled in by
373 * reg_device_uevent
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500374 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700375static int call_crda(const char *alpha2)
376{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700377 if (!is_world_regdom((char *) alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -0800378 pr_info("Calling CRDA for country: %c%c\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700379 alpha2[0], alpha2[1]);
380 else
Joe Perchese9c02682010-11-16 19:56:49 -0800381 pr_info("Calling CRDA to update world regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700382
John W. Linville3b377ea2009-12-18 17:59:01 -0500383 /* query internal regulatory database (if it exists) */
384 reg_regdb_query(alpha2);
385
Scott James Remnant4d9d88d2011-03-08 10:45:30 -0800386 return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700387}
388
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700389/* Used by nl80211 before kmalloc'ing our regulatory domain */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200390bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700391{
Luis R. Rodriguez61405e92009-05-13 17:04:41 -0400392 assert_cfg80211_lock();
393
Johannes Bergf6037d02008-10-21 11:01:33 +0200394 if (!last_request)
395 return false;
396
397 return alpha2_equal(last_request->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700398}
399
400/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200401static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700402{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200403 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700404 u32 freq_diff;
405
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800406 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700407 return false;
408
409 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
410 return false;
411
412 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
413
Roel Kluinbd05f282009-03-03 22:55:21 +0100414 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
415 freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700416 return false;
417
418 return true;
419}
420
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200421static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700422{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200423 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700424 unsigned int i;
425
426 if (!rd->n_reg_rules)
427 return false;
428
Luis R. Rodriguez88dc1c32008-11-12 14:22:01 -0800429 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
430 return false;
431
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700432 for (i = 0; i < rd->n_reg_rules; i++) {
433 reg_rule = &rd->reg_rules[i];
434 if (!is_valid_reg_rule(reg_rule))
435 return false;
436 }
437
438 return true;
439}
440
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400441static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
442 u32 center_freq_khz,
443 u32 bw_khz)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700444{
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400445 u32 start_freq_khz, end_freq_khz;
446
447 start_freq_khz = center_freq_khz - (bw_khz/2);
448 end_freq_khz = center_freq_khz + (bw_khz/2);
449
450 if (start_freq_khz >= freq_range->start_freq_khz &&
451 end_freq_khz <= freq_range->end_freq_khz)
452 return true;
453
454 return false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700455}
456
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800457/**
458 * freq_in_rule_band - tells us if a frequency is in a frequency band
459 * @freq_range: frequency rule we want to query
460 * @freq_khz: frequency we are inquiring about
461 *
462 * This lets us know if a specific frequency rule is or is not relevant to
463 * a specific frequency's band. Bands are device specific and artificial
464 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
465 * safe for now to assume that a frequency rule should not be part of a
466 * frequency's band if the start freq or end freq are off by more than 2 GHz.
467 * This resolution can be lowered and should be considered as we add
468 * regulatory rule support for other "bands".
469 **/
470static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
471 u32 freq_khz)
472{
473#define ONE_GHZ_IN_KHZ 1000000
474 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
475 return true;
476 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
477 return true;
478 return false;
479#undef ONE_GHZ_IN_KHZ
480}
481
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500482/*
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500483 * Helper for regdom_intersect(), this does the real
484 * mathematical intersection fun
485 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700486static int reg_rules_intersect(
487 const struct ieee80211_reg_rule *rule1,
488 const struct ieee80211_reg_rule *rule2,
489 struct ieee80211_reg_rule *intersected_rule)
490{
491 const struct ieee80211_freq_range *freq_range1, *freq_range2;
492 struct ieee80211_freq_range *freq_range;
493 const struct ieee80211_power_rule *power_rule1, *power_rule2;
494 struct ieee80211_power_rule *power_rule;
495 u32 freq_diff;
496
497 freq_range1 = &rule1->freq_range;
498 freq_range2 = &rule2->freq_range;
499 freq_range = &intersected_rule->freq_range;
500
501 power_rule1 = &rule1->power_rule;
502 power_rule2 = &rule2->power_rule;
503 power_rule = &intersected_rule->power_rule;
504
505 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
506 freq_range2->start_freq_khz);
507 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
508 freq_range2->end_freq_khz);
509 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
510 freq_range2->max_bandwidth_khz);
511
512 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
513 if (freq_range->max_bandwidth_khz > freq_diff)
514 freq_range->max_bandwidth_khz = freq_diff;
515
516 power_rule->max_eirp = min(power_rule1->max_eirp,
517 power_rule2->max_eirp);
518 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
519 power_rule2->max_antenna_gain);
520
521 intersected_rule->flags = (rule1->flags | rule2->flags);
522
523 if (!is_valid_reg_rule(intersected_rule))
524 return -EINVAL;
525
526 return 0;
527}
528
529/**
530 * regdom_intersect - do the intersection between two regulatory domains
531 * @rd1: first regulatory domain
532 * @rd2: second regulatory domain
533 *
534 * Use this function to get the intersection between two regulatory domains.
535 * Once completed we will mark the alpha2 for the rd as intersected, "98",
536 * as no one single alpha2 can represent this regulatory domain.
537 *
538 * Returns a pointer to the regulatory domain structure which will hold the
539 * resulting intersection of rules between rd1 and rd2. We will
540 * kzalloc() this structure for you.
541 */
542static struct ieee80211_regdomain *regdom_intersect(
543 const struct ieee80211_regdomain *rd1,
544 const struct ieee80211_regdomain *rd2)
545{
546 int r, size_of_regd;
547 unsigned int x, y;
548 unsigned int num_rules = 0, rule_idx = 0;
549 const struct ieee80211_reg_rule *rule1, *rule2;
550 struct ieee80211_reg_rule *intersected_rule;
551 struct ieee80211_regdomain *rd;
552 /* This is just a dummy holder to help us count */
553 struct ieee80211_reg_rule irule;
554
555 /* Uses the stack temporarily for counter arithmetic */
556 intersected_rule = &irule;
557
558 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
559
560 if (!rd1 || !rd2)
561 return NULL;
562
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500563 /*
564 * First we get a count of the rules we'll need, then we actually
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700565 * build them. This is to so we can malloc() and free() a
566 * regdomain once. The reason we use reg_rules_intersect() here
567 * is it will return -EINVAL if the rule computed makes no sense.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500568 * All rules that do check out OK are valid.
569 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700570
571 for (x = 0; x < rd1->n_reg_rules; x++) {
572 rule1 = &rd1->reg_rules[x];
573 for (y = 0; y < rd2->n_reg_rules; y++) {
574 rule2 = &rd2->reg_rules[y];
575 if (!reg_rules_intersect(rule1, rule2,
576 intersected_rule))
577 num_rules++;
578 memset(intersected_rule, 0,
579 sizeof(struct ieee80211_reg_rule));
580 }
581 }
582
583 if (!num_rules)
584 return NULL;
585
586 size_of_regd = sizeof(struct ieee80211_regdomain) +
587 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
588
589 rd = kzalloc(size_of_regd, GFP_KERNEL);
590 if (!rd)
591 return NULL;
592
593 for (x = 0; x < rd1->n_reg_rules; x++) {
594 rule1 = &rd1->reg_rules[x];
595 for (y = 0; y < rd2->n_reg_rules; y++) {
596 rule2 = &rd2->reg_rules[y];
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500597 /*
598 * This time around instead of using the stack lets
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700599 * write to the target rule directly saving ourselves
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500600 * a memcpy()
601 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700602 intersected_rule = &rd->reg_rules[rule_idx];
603 r = reg_rules_intersect(rule1, rule2,
604 intersected_rule);
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500605 /*
606 * No need to memset here the intersected rule here as
607 * we're not using the stack anymore
608 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700609 if (r)
610 continue;
611 rule_idx++;
612 }
613 }
614
615 if (rule_idx != num_rules) {
616 kfree(rd);
617 return NULL;
618 }
619
620 rd->n_reg_rules = num_rules;
621 rd->alpha2[0] = '9';
622 rd->alpha2[1] = '8';
623
624 return rd;
625}
626
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500627/*
628 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
629 * want to just have the channel structure use these
630 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700631static u32 map_regdom_flags(u32 rd_flags)
632{
633 u32 channel_flags = 0;
634 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
635 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
636 if (rd_flags & NL80211_RRF_NO_IBSS)
637 channel_flags |= IEEE80211_CHAN_NO_IBSS;
638 if (rd_flags & NL80211_RRF_DFS)
639 channel_flags |= IEEE80211_CHAN_RADAR;
640 return channel_flags;
641}
642
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800643static int freq_reg_info_regd(struct wiphy *wiphy,
644 u32 center_freq,
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400645 u32 desired_bw_khz,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800646 const struct ieee80211_reg_rule **reg_rule,
647 const struct ieee80211_regdomain *custom_regd)
Johannes Berg8318d782008-01-24 19:38:38 +0100648{
649 int i;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800650 bool band_rule_found = false;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800651 const struct ieee80211_regdomain *regd;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400652 bool bw_fits = false;
653
654 if (!desired_bw_khz)
655 desired_bw_khz = MHZ_TO_KHZ(20);
Johannes Berg8318d782008-01-24 19:38:38 +0100656
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800657 regd = custom_regd ? custom_regd : cfg80211_regdomain;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800658
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500659 /*
660 * Follow the driver's regulatory domain, if present, unless a country
661 * IE has been processed or a user wants to help complaince further
662 */
Luis R. Rodriguez2784fe92010-12-15 19:24:11 -0800663 if (!custom_regd &&
664 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400665 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800666 wiphy->regd)
667 regd = wiphy->regd;
668
669 if (!regd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700670 return -EINVAL;
671
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800672 for (i = 0; i < regd->n_reg_rules; i++) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700673 const struct ieee80211_reg_rule *rr;
674 const struct ieee80211_freq_range *fr = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700675
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800676 rr = &regd->reg_rules[i];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700677 fr = &rr->freq_range;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800678
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500679 /*
680 * We only need to know if one frequency rule was
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800681 * was in center_freq's band, that's enough, so lets
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500682 * not overwrite it once found
683 */
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800684 if (!band_rule_found)
685 band_rule_found = freq_in_rule_band(fr, center_freq);
686
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400687 bw_fits = reg_does_bw_fit(fr,
688 center_freq,
689 desired_bw_khz);
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800690
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400691 if (band_rule_found && bw_fits) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700692 *reg_rule = rr;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400693 return 0;
Johannes Berg8318d782008-01-24 19:38:38 +0100694 }
695 }
696
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800697 if (!band_rule_found)
698 return -ERANGE;
699
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400700 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700701}
702
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400703int freq_reg_info(struct wiphy *wiphy,
704 u32 center_freq,
705 u32 desired_bw_khz,
706 const struct ieee80211_reg_rule **reg_rule)
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800707{
Luis R. Rodriguezac46d482009-05-01 18:44:50 -0400708 assert_cfg80211_lock();
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400709 return freq_reg_info_regd(wiphy,
710 center_freq,
711 desired_bw_khz,
712 reg_rule,
713 NULL);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800714}
John W. Linville4f366c52010-07-15 14:57:33 -0400715EXPORT_SYMBOL(freq_reg_info);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700716
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530717#ifdef CONFIG_CFG80211_REG_DEBUG
718static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
719{
720 switch (initiator) {
721 case NL80211_REGDOM_SET_BY_CORE:
722 return "Set by core";
723 case NL80211_REGDOM_SET_BY_USER:
724 return "Set by user";
725 case NL80211_REGDOM_SET_BY_DRIVER:
726 return "Set by driver";
727 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
728 return "Set by country IE";
729 default:
730 WARN_ON(1);
731 return "Set by bug";
732 }
733}
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530734
735static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
736 u32 desired_bw_khz,
737 const struct ieee80211_reg_rule *reg_rule)
738{
739 const struct ieee80211_power_rule *power_rule;
740 const struct ieee80211_freq_range *freq_range;
741 char max_antenna_gain[32];
742
743 power_rule = &reg_rule->power_rule;
744 freq_range = &reg_rule->freq_range;
745
746 if (!power_rule->max_antenna_gain)
747 snprintf(max_antenna_gain, 32, "N/A");
748 else
749 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
750
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700751 REG_DBG_PRINT("Updating information on frequency %d MHz "
Bob Copelandff039c62010-12-29 17:09:02 -0500752 "for a %d MHz width channel with regulatory rule:\n",
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530753 chan->center_freq,
754 KHZ_TO_MHZ(desired_bw_khz));
755
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700756 REG_DBG_PRINT("%d KHz - %d KHz @ KHz), (%s mBi, %d mBm)\n",
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530757 freq_range->start_freq_khz,
758 freq_range->end_freq_khz,
759 max_antenna_gain,
760 power_rule->max_eirp);
761}
762#else
763static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
764 u32 desired_bw_khz,
765 const struct ieee80211_reg_rule *reg_rule)
766{
767 return;
768}
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530769#endif
770
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400771/*
772 * Note that right now we assume the desired channel bandwidth
773 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
774 * per channel, the primary and the extension channel). To support
775 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
776 * new ieee80211_channel.target_bw and re run the regulatory check
777 * on the wiphy with the target_bw specified. Then we can simply use
778 * that below for the desired_bw_khz below.
779 */
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700780static void handle_channel(struct wiphy *wiphy,
781 enum nl80211_reg_initiator initiator,
782 enum ieee80211_band band,
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800783 unsigned int chan_idx)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700784{
785 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400786 u32 flags, bw_flags = 0;
787 u32 desired_bw_khz = MHZ_TO_KHZ(20);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700788 const struct ieee80211_reg_rule *reg_rule = NULL;
789 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400790 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800791 struct ieee80211_supported_band *sband;
792 struct ieee80211_channel *chan;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500793 struct wiphy *request_wiphy = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800794
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500795 assert_cfg80211_lock();
796
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500797 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
798
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800799 sband = wiphy->bands[band];
800 BUG_ON(chan_idx >= sband->n_channels);
801 chan = &sband->channels[chan_idx];
802
803 flags = chan->orig_flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700804
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400805 r = freq_reg_info(wiphy,
806 MHZ_TO_KHZ(chan->center_freq),
807 desired_bw_khz,
808 &reg_rule);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700809
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700810 if (r) {
811 /*
812 * We will disable all channels that do not match our
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300813 * received regulatory rule unless the hint is coming
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700814 * from a Country IE and the Country IE had no information
815 * about a band. The IEEE 802.11 spec allows for an AP
816 * to send only a subset of the regulatory rules allowed,
817 * so an AP in the US that only supports 2.4 GHz may only send
818 * a country IE with information for the 2.4 GHz band
819 * while 5 GHz is still supported.
820 */
821 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
822 r == -ERANGE)
823 return;
824
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700825 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700826 chan->flags = IEEE80211_CHAN_DISABLED;
Johannes Berg8318d782008-01-24 19:38:38 +0100827 return;
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700828 }
Johannes Berg8318d782008-01-24 19:38:38 +0100829
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530830 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
831
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700832 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400833 freq_range = &reg_rule->freq_range;
834
835 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
836 bw_flags = IEEE80211_CHAN_NO_HT40;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700837
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400838 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500839 request_wiphy && request_wiphy == wiphy &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100840 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500841 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300842 * This guarantees the driver's requested regulatory domain
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800843 * will always be used as a base for further regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500844 * settings
845 */
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800846 chan->flags = chan->orig_flags =
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400847 map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800848 chan->max_antenna_gain = chan->orig_mag =
849 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800850 chan->max_power = chan->orig_mpwr =
851 (int) MBM_TO_DBM(power_rule->max_eirp);
852 return;
853 }
854
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400855 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
Johannes Berg8318d782008-01-24 19:38:38 +0100856 chan->max_antenna_gain = min(chan->orig_mag,
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700857 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
John W. Linville253898c2008-04-03 15:32:54 -0400858 if (chan->orig_mpwr)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700859 chan->max_power = min(chan->orig_mpwr,
860 (int) MBM_TO_DBM(power_rule->max_eirp));
John W. Linville253898c2008-04-03 15:32:54 -0400861 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700862 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
Johannes Berg8318d782008-01-24 19:38:38 +0100863}
864
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700865static void handle_band(struct wiphy *wiphy,
866 enum ieee80211_band band,
867 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +0100868{
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800869 unsigned int i;
870 struct ieee80211_supported_band *sband;
871
872 BUG_ON(!wiphy->bands[band]);
873 sband = wiphy->bands[band];
Johannes Berg8318d782008-01-24 19:38:38 +0100874
875 for (i = 0; i < sband->n_channels; i++)
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700876 handle_channel(wiphy, initiator, band, i);
Johannes Berg8318d782008-01-24 19:38:38 +0100877}
878
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400879static bool ignore_reg_update(struct wiphy *wiphy,
880 enum nl80211_reg_initiator initiator)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800881{
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530882 if (!last_request) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700883 REG_DBG_PRINT("Ignoring regulatory request %s since "
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530884 "last_request is not set\n",
885 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800886 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530887 }
888
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400889 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530890 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700891 REG_DBG_PRINT("Ignoring regulatory request %s "
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530892 "since the driver uses its own custom "
893 "regulatory domain ",
894 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800895 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530896 }
897
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500898 /*
899 * wiphy->regd will be set once the device has its own
900 * desired regulatory domain set
901 */
Johannes Berg5be83de2009-11-19 00:56:28 +0100902 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
Luis R. Rodriguez749b5272010-10-20 10:18:54 -0700903 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530904 !is_world_regdom(last_request->alpha2)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700905 REG_DBG_PRINT("Ignoring regulatory request %s "
Mihai Moldovan5bc91db2011-07-25 11:18:58 +0200906 "since the driver requires its own regulatory "
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530907 "domain to be set first",
908 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800909 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530910 }
911
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800912 return false;
913}
914
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400915static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700916{
Johannes Berg79c97e92009-07-07 03:56:12 +0200917 struct cfg80211_registered_device *rdev;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700918
Johannes Berg79c97e92009-07-07 03:56:12 +0200919 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
920 wiphy_update_regulatory(&rdev->wiphy, initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700921}
922
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500923static void handle_reg_beacon(struct wiphy *wiphy,
924 unsigned int chan_idx,
925 struct reg_beacon *reg_beacon)
926{
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500927 struct ieee80211_supported_band *sband;
928 struct ieee80211_channel *chan;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400929 bool channel_changed = false;
930 struct ieee80211_channel chan_before;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500931
932 assert_cfg80211_lock();
933
934 sband = wiphy->bands[reg_beacon->chan.band];
935 chan = &sband->channels[chan_idx];
936
937 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
938 return;
939
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400940 if (chan->beacon_found)
941 return;
942
943 chan->beacon_found = true;
944
Johannes Berg5be83de2009-11-19 00:56:28 +0100945 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700946 return;
947
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400948 chan_before.center_freq = chan->center_freq;
949 chan_before.flags = chan->flags;
950
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700951 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500952 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400953 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500954 }
955
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700956 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500957 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400958 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500959 }
960
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400961 if (channel_changed)
962 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500963}
964
965/*
966 * Called when a scan on a wiphy finds a beacon on
967 * new channel
968 */
969static void wiphy_update_new_beacon(struct wiphy *wiphy,
970 struct reg_beacon *reg_beacon)
971{
972 unsigned int i;
973 struct ieee80211_supported_band *sband;
974
975 assert_cfg80211_lock();
976
977 if (!wiphy->bands[reg_beacon->chan.band])
978 return;
979
980 sband = wiphy->bands[reg_beacon->chan.band];
981
982 for (i = 0; i < sband->n_channels; i++)
983 handle_reg_beacon(wiphy, i, reg_beacon);
984}
985
986/*
987 * Called upon reg changes or a new wiphy is added
988 */
989static void wiphy_update_beacon_reg(struct wiphy *wiphy)
990{
991 unsigned int i;
992 struct ieee80211_supported_band *sband;
993 struct reg_beacon *reg_beacon;
994
995 assert_cfg80211_lock();
996
997 if (list_empty(&reg_beacon_list))
998 return;
999
1000 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1001 if (!wiphy->bands[reg_beacon->chan.band])
1002 continue;
1003 sband = wiphy->bands[reg_beacon->chan.band];
1004 for (i = 0; i < sband->n_channels; i++)
1005 handle_reg_beacon(wiphy, i, reg_beacon);
1006 }
1007}
1008
1009static bool reg_is_world_roaming(struct wiphy *wiphy)
1010{
1011 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1012 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1013 return true;
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -04001014 if (last_request &&
1015 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Johannes Berg5be83de2009-11-19 00:56:28 +01001016 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001017 return true;
1018 return false;
1019}
1020
1021/* Reap the advantages of previously found beacons */
1022static void reg_process_beacons(struct wiphy *wiphy)
1023{
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -04001024 /*
1025 * Means we are just firing up cfg80211, so no beacons would
1026 * have been processed yet.
1027 */
1028 if (!last_request)
1029 return;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001030 if (!reg_is_world_roaming(wiphy))
1031 return;
1032 wiphy_update_beacon_reg(wiphy);
1033}
1034
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001035static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1036{
1037 if (!chan)
1038 return true;
1039 if (chan->flags & IEEE80211_CHAN_DISABLED)
1040 return true;
1041 /* This would happen when regulatory rules disallow HT40 completely */
1042 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1043 return true;
1044 return false;
1045}
1046
1047static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1048 enum ieee80211_band band,
1049 unsigned int chan_idx)
1050{
1051 struct ieee80211_supported_band *sband;
1052 struct ieee80211_channel *channel;
1053 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1054 unsigned int i;
1055
1056 assert_cfg80211_lock();
1057
1058 sband = wiphy->bands[band];
1059 BUG_ON(chan_idx >= sband->n_channels);
1060 channel = &sband->channels[chan_idx];
1061
1062 if (is_ht40_not_allowed(channel)) {
1063 channel->flags |= IEEE80211_CHAN_NO_HT40;
1064 return;
1065 }
1066
1067 /*
1068 * We need to ensure the extension channels exist to
1069 * be able to use HT40- or HT40+, this finds them (or not)
1070 */
1071 for (i = 0; i < sband->n_channels; i++) {
1072 struct ieee80211_channel *c = &sband->channels[i];
1073 if (c->center_freq == (channel->center_freq - 20))
1074 channel_before = c;
1075 if (c->center_freq == (channel->center_freq + 20))
1076 channel_after = c;
1077 }
1078
1079 /*
1080 * Please note that this assumes target bandwidth is 20 MHz,
1081 * if that ever changes we also need to change the below logic
1082 * to include that as well.
1083 */
1084 if (is_ht40_not_allowed(channel_before))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001085 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001086 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001087 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001088
1089 if (is_ht40_not_allowed(channel_after))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001090 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001091 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001092 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001093}
1094
1095static void reg_process_ht_flags_band(struct wiphy *wiphy,
1096 enum ieee80211_band band)
1097{
1098 unsigned int i;
1099 struct ieee80211_supported_band *sband;
1100
1101 BUG_ON(!wiphy->bands[band]);
1102 sband = wiphy->bands[band];
1103
1104 for (i = 0; i < sband->n_channels; i++)
1105 reg_process_ht_flags_channel(wiphy, band, i);
1106}
1107
1108static void reg_process_ht_flags(struct wiphy *wiphy)
1109{
1110 enum ieee80211_band band;
1111
1112 if (!wiphy)
1113 return;
1114
1115 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1116 if (wiphy->bands[band])
1117 reg_process_ht_flags_band(wiphy, band);
1118 }
1119
1120}
1121
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001122void wiphy_update_regulatory(struct wiphy *wiphy,
1123 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +01001124{
1125 enum ieee80211_band band;
Luis R. Rodriguezd46e5b12009-01-22 15:05:50 -08001126
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001127 if (ignore_reg_update(wiphy, initiator))
Sven Neumanna203c2a2011-07-12 15:52:07 +02001128 return;
1129
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001130 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Johannes Berg8318d782008-01-24 19:38:38 +01001131 if (wiphy->bands[band])
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -07001132 handle_band(wiphy, band, initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001133 }
Sven Neumanna203c2a2011-07-12 15:52:07 +02001134
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001135 reg_process_beacons(wiphy);
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001136 reg_process_ht_flags(wiphy);
Luis R. Rodriguez560e28e2009-01-07 17:43:32 -08001137 if (wiphy->reg_notifier)
Luis R. Rodriguez716f9392009-01-22 15:05:51 -08001138 wiphy->reg_notifier(wiphy, last_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001139}
1140
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001141static void handle_channel_custom(struct wiphy *wiphy,
1142 enum ieee80211_band band,
1143 unsigned int chan_idx,
1144 const struct ieee80211_regdomain *regd)
1145{
1146 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001147 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1148 u32 bw_flags = 0;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001149 const struct ieee80211_reg_rule *reg_rule = NULL;
1150 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001151 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001152 struct ieee80211_supported_band *sband;
1153 struct ieee80211_channel *chan;
1154
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001155 assert_reg_lock();
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001156
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001157 sband = wiphy->bands[band];
1158 BUG_ON(chan_idx >= sband->n_channels);
1159 chan = &sband->channels[chan_idx];
1160
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001161 r = freq_reg_info_regd(wiphy,
1162 MHZ_TO_KHZ(chan->center_freq),
1163 desired_bw_khz,
1164 &reg_rule,
1165 regd);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001166
1167 if (r) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001168 REG_DBG_PRINT("Disabling freq %d MHz as custom "
Luis R. Rodrigueza6518532010-10-20 10:18:57 -07001169 "regd has no rule that fits a %d MHz "
1170 "wide channel\n",
1171 chan->center_freq,
1172 KHZ_TO_MHZ(desired_bw_khz));
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001173 chan->flags = IEEE80211_CHAN_DISABLED;
1174 return;
1175 }
1176
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +05301177 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1178
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001179 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001180 freq_range = &reg_rule->freq_range;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001181
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001182 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1183 bw_flags = IEEE80211_CHAN_NO_HT40;
1184
1185 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001186 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001187 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1188}
1189
1190static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1191 const struct ieee80211_regdomain *regd)
1192{
1193 unsigned int i;
1194 struct ieee80211_supported_band *sband;
1195
1196 BUG_ON(!wiphy->bands[band]);
1197 sband = wiphy->bands[band];
1198
1199 for (i = 0; i < sband->n_channels; i++)
1200 handle_channel_custom(wiphy, band, i, regd);
1201}
1202
1203/* Used by drivers prior to wiphy registration */
1204void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1205 const struct ieee80211_regdomain *regd)
1206{
1207 enum ieee80211_band band;
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001208 unsigned int bands_set = 0;
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001209
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001210 mutex_lock(&reg_mutex);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001211 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001212 if (!wiphy->bands[band])
1213 continue;
1214 handle_band_custom(wiphy, band, regd);
1215 bands_set++;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001216 }
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001217 mutex_unlock(&reg_mutex);
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001218
1219 /*
1220 * no point in calling this if it won't have any effect
1221 * on your device's supportd bands.
1222 */
1223 WARN_ON(!bands_set);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001224}
1225EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1226
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001227/*
1228 * Return value which can be used by ignore_request() to indicate
1229 * it has been determined we should intersect two regulatory domains
1230 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001231#define REG_INTERSECT 1
1232
Johannes Berg84fa4f42008-10-24 20:32:23 +02001233/* This has the logic which determines when a new request
1234 * should be ignored. */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001235static int ignore_request(struct wiphy *wiphy,
1236 struct regulatory_request *pending_request)
Johannes Berg84fa4f42008-10-24 20:32:23 +02001237{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001238 struct wiphy *last_wiphy = NULL;
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001239
1240 assert_cfg80211_lock();
1241
Johannes Berg84fa4f42008-10-24 20:32:23 +02001242 /* All initial requests are respected */
1243 if (!last_request)
1244 return 0;
1245
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001246 switch (pending_request->initiator) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001247 case NL80211_REGDOM_SET_BY_CORE:
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001248 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001249 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001250
1251 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1252
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001253 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001254 return -EINVAL;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001255 if (last_request->initiator ==
1256 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001257 if (last_wiphy != wiphy) {
Johannes Berg84fa4f42008-10-24 20:32:23 +02001258 /*
1259 * Two cards with two APs claiming different
Thadeu Lima de Souza Cascardo1fe90b02009-08-11 11:18:42 -03001260 * Country IE alpha2s. We could
Johannes Berg84fa4f42008-10-24 20:32:23 +02001261 * intersect them, but that seems unlikely
1262 * to be correct. Reject second one for now.
1263 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001264 if (regdom_changes(pending_request->alpha2))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001265 return -EOPNOTSUPP;
1266 return -EALREADY;
1267 }
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001268 /*
1269 * Two consecutive Country IE hints on the same wiphy.
1270 * This should be picked up early by the driver/stack
1271 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001272 if (WARN_ON(regdom_changes(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001273 return 0;
1274 return -EALREADY;
1275 }
Luis R. Rodrigueza171fba2010-10-18 17:44:51 -07001276 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001277 case NL80211_REGDOM_SET_BY_DRIVER:
1278 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001279 if (regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001280 return 0;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001281 return -EALREADY;
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001282 }
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001283
1284 /*
1285 * This would happen if you unplug and plug your card
1286 * back in or if you add a new device for which the previously
1287 * loaded card also agrees on the regulatory domain.
1288 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001289 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001290 !regdom_changes(pending_request->alpha2))
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001291 return -EALREADY;
1292
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001293 return REG_INTERSECT;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001294 case NL80211_REGDOM_SET_BY_USER:
1295 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001296 return REG_INTERSECT;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001297 /*
1298 * If the user knows better the user should set the regdom
1299 * to their country before the IE is picked up
1300 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001301 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001302 last_request->intersect)
1303 return -EOPNOTSUPP;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001304 /*
1305 * Process user requests only after previous user/driver/core
1306 * requests have been processed
1307 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001308 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1309 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1310 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
Luis R. Rodriguez69b15722009-02-21 00:04:33 -05001311 if (regdom_changes(last_request->alpha2))
Luis R. Rodriguez5eebade2009-01-22 15:05:47 -08001312 return -EAGAIN;
1313 }
1314
John W. Linvillebaeb66f2009-12-18 17:59:02 -05001315 if (!regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001316 return -EALREADY;
1317
Johannes Berg84fa4f42008-10-24 20:32:23 +02001318 return 0;
1319 }
1320
1321 return -EINVAL;
1322}
1323
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001324static void reg_set_request_processed(void)
1325{
1326 bool need_more_processing = false;
1327
1328 last_request->processed = true;
1329
1330 spin_lock(&reg_requests_lock);
1331 if (!list_empty(&reg_requests_list))
1332 need_more_processing = true;
1333 spin_unlock(&reg_requests_lock);
1334
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001335 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
1336 cancel_delayed_work_sync(&reg_timeout);
1337
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001338 if (need_more_processing)
1339 schedule_work(&reg_work);
1340}
1341
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001342/**
1343 * __regulatory_hint - hint to the wireless core a regulatory domain
1344 * @wiphy: if the hint comes from country information from an AP, this
1345 * is required to be set to the wiphy that received the information
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001346 * @pending_request: the regulatory request currently being processed
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001347 *
1348 * The Wireless subsystem can use this function to hint to the wireless core
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001349 * what it believes should be the current regulatory domain.
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001350 *
1351 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1352 * already been set or other standard error codes.
1353 *
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001354 * Caller must hold &cfg80211_mutex and &reg_mutex
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001355 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001356static int __regulatory_hint(struct wiphy *wiphy,
1357 struct regulatory_request *pending_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001358{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001359 bool intersect = false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001360 int r = 0;
1361
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001362 assert_cfg80211_lock();
1363
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001364 r = ignore_request(wiphy, pending_request);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001365
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001366 if (r == REG_INTERSECT) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001367 if (pending_request->initiator ==
1368 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001369 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001370 if (r) {
1371 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001372 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001373 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001374 }
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001375 intersect = true;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001376 } else if (r) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001377 /*
1378 * If the regulatory domain being requested by the
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001379 * driver has already been set just copy it to the
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001380 * wiphy
1381 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001382 if (r == -EALREADY &&
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001383 pending_request->initiator ==
1384 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001385 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001386 if (r) {
1387 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001388 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001389 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001390 r = -EALREADY;
1391 goto new_request;
1392 }
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001393 kfree(pending_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001394 return r;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001395 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001396
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001397new_request:
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001398 kfree(last_request);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001399
1400 last_request = pending_request;
1401 last_request->intersect = intersect;
1402
1403 pending_request = NULL;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001404
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001405 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1406 user_alpha2[0] = last_request->alpha2[0];
1407 user_alpha2[1] = last_request->alpha2[1];
1408 }
1409
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001410 /* When r == REG_INTERSECT we do need to call CRDA */
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001411 if (r < 0) {
1412 /*
1413 * Since CRDA will not be called in this case as we already
1414 * have applied the requested regulatory domain before we just
1415 * inform userspace we have processed the request
1416 */
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001417 if (r == -EALREADY) {
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001418 nl80211_send_reg_change_event(last_request);
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001419 reg_set_request_processed();
1420 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001421 return r;
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001422 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001423
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001424 return call_crda(last_request->alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001425}
1426
Luis R. Rodriguez30a548c2009-05-02 01:17:27 -04001427/* This processes *all* regulatory hints */
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001428static void reg_process_hint(struct regulatory_request *reg_request)
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001429{
1430 int r = 0;
1431 struct wiphy *wiphy = NULL;
Yuri Ershovc4c32292010-06-29 15:08:08 +04001432 enum nl80211_reg_initiator initiator = reg_request->initiator;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001433
1434 BUG_ON(!reg_request->alpha2);
1435
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001436 if (wiphy_idx_valid(reg_request->wiphy_idx))
1437 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1438
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001439 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001440 !wiphy) {
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001441 kfree(reg_request);
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001442 return;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001443 }
1444
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001445 r = __regulatory_hint(wiphy, reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001446 /* This is required so that the orig_* parameters are saved */
Johannes Berg5be83de2009-11-19 00:56:28 +01001447 if (r == -EALREADY && wiphy &&
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001448 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
Yuri Ershovc4c32292010-06-29 15:08:08 +04001449 wiphy_update_regulatory(wiphy, initiator);
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001450 return;
1451 }
1452
1453 /*
1454 * We only time out user hints, given that they should be the only
1455 * source of bogus requests.
1456 */
Luis R. Rodriguezc989bb12011-04-25 18:35:48 -07001457 if (r != -EALREADY &&
1458 reg_request->initiator == NL80211_REGDOM_SET_BY_USER)
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07001459 schedule_delayed_work(&reg_timeout, msecs_to_jiffies(3142));
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001460}
1461
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001462/*
1463 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1464 * Regulatory hints come on a first come first serve basis and we
1465 * must process each one atomically.
1466 */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001467static void reg_process_pending_hints(void)
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001468{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001469 struct regulatory_request *reg_request;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001470
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001471 mutex_lock(&cfg80211_mutex);
1472 mutex_lock(&reg_mutex);
1473
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001474 /* When last_request->processed becomes true this will be rescheduled */
1475 if (last_request && !last_request->processed) {
1476 REG_DBG_PRINT("Pending regulatory request, waiting "
1477 "for it to be processed...");
1478 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001479 }
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001480
1481 spin_lock(&reg_requests_lock);
1482
1483 if (list_empty(&reg_requests_list)) {
1484 spin_unlock(&reg_requests_lock);
1485 goto out;
1486 }
1487
1488 reg_request = list_first_entry(&reg_requests_list,
1489 struct regulatory_request,
1490 list);
1491 list_del_init(&reg_request->list);
1492
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001493 spin_unlock(&reg_requests_lock);
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001494
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001495 reg_process_hint(reg_request);
1496
1497out:
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001498 mutex_unlock(&reg_mutex);
1499 mutex_unlock(&cfg80211_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001500}
1501
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001502/* Processes beacon hints -- this has nothing to do with country IEs */
1503static void reg_process_pending_beacon_hints(void)
1504{
Johannes Berg79c97e92009-07-07 03:56:12 +02001505 struct cfg80211_registered_device *rdev;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001506 struct reg_beacon *pending_beacon, *tmp;
1507
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001508 /*
1509 * No need to hold the reg_mutex here as we just touch wiphys
1510 * and do not read or access regulatory variables.
1511 */
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001512 mutex_lock(&cfg80211_mutex);
1513
1514 /* This goes through the _pending_ beacon list */
1515 spin_lock_bh(&reg_pending_beacons_lock);
1516
1517 if (list_empty(&reg_pending_beacons)) {
1518 spin_unlock_bh(&reg_pending_beacons_lock);
1519 goto out;
1520 }
1521
1522 list_for_each_entry_safe(pending_beacon, tmp,
1523 &reg_pending_beacons, list) {
1524
1525 list_del_init(&pending_beacon->list);
1526
1527 /* Applies the beacon hint to current wiphys */
Johannes Berg79c97e92009-07-07 03:56:12 +02001528 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1529 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001530
1531 /* Remembers the beacon hint for new wiphys or reg changes */
1532 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1533 }
1534
1535 spin_unlock_bh(&reg_pending_beacons_lock);
1536out:
1537 mutex_unlock(&cfg80211_mutex);
1538}
1539
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001540static void reg_todo(struct work_struct *work)
1541{
1542 reg_process_pending_hints();
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001543 reg_process_pending_beacon_hints();
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001544}
1545
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001546static void queue_regulatory_request(struct regulatory_request *request)
1547{
John W. Linvillec61029c2010-08-05 14:26:24 -04001548 if (isalpha(request->alpha2[0]))
1549 request->alpha2[0] = toupper(request->alpha2[0]);
1550 if (isalpha(request->alpha2[1]))
1551 request->alpha2[1] = toupper(request->alpha2[1]);
1552
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001553 spin_lock(&reg_requests_lock);
1554 list_add_tail(&request->list, &reg_requests_list);
1555 spin_unlock(&reg_requests_lock);
1556
1557 schedule_work(&reg_work);
1558}
1559
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001560/*
1561 * Core regulatory hint -- happens during cfg80211_init()
1562 * and when we restore regulatory settings.
1563 */
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001564static int regulatory_hint_core(const char *alpha2)
1565{
1566 struct regulatory_request *request;
1567
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001568 kfree(last_request);
1569 last_request = NULL;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001570
1571 request = kzalloc(sizeof(struct regulatory_request),
1572 GFP_KERNEL);
1573 if (!request)
1574 return -ENOMEM;
1575
1576 request->alpha2[0] = alpha2[0];
1577 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001578 request->initiator = NL80211_REGDOM_SET_BY_CORE;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001579
Luis R. Rodriguez31e99722010-11-17 21:46:06 -08001580 queue_regulatory_request(request);
Luis R. Rodriguez5078b2e2009-05-13 17:04:42 -04001581
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001582 return 0;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001583}
1584
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001585/* User hints */
1586int regulatory_hint_user(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001587{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001588 struct regulatory_request *request;
1589
Johannes Bergbe3d4812008-10-24 20:32:21 +02001590 BUG_ON(!alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001591
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001592 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1593 if (!request)
1594 return -ENOMEM;
1595
1596 request->wiphy_idx = WIPHY_IDX_STALE;
1597 request->alpha2[0] = alpha2[0];
1598 request->alpha2[1] = alpha2[1];
Luis R. Rodrigueze12822e2010-01-04 11:37:39 -05001599 request->initiator = NL80211_REGDOM_SET_BY_USER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001600
1601 queue_regulatory_request(request);
1602
1603 return 0;
1604}
1605
1606/* Driver hints */
1607int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1608{
1609 struct regulatory_request *request;
1610
1611 BUG_ON(!alpha2);
1612 BUG_ON(!wiphy);
1613
1614 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1615 if (!request)
1616 return -ENOMEM;
1617
1618 request->wiphy_idx = get_wiphy_idx(wiphy);
1619
1620 /* Must have registered wiphy first */
1621 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1622
1623 request->alpha2[0] = alpha2[0];
1624 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001625 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001626
1627 queue_regulatory_request(request);
1628
1629 return 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001630}
1631EXPORT_SYMBOL(regulatory_hint);
1632
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001633/*
1634 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1635 * therefore cannot iterate over the rdev list here.
1636 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001637void regulatory_hint_11d(struct wiphy *wiphy,
Luis R. Rodriguez84920e32010-01-14 20:08:20 -05001638 enum ieee80211_band band,
1639 u8 *country_ie,
1640 u8 country_ie_len)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001641{
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001642 char alpha2[2];
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001643 enum environment_cap env = ENVIRON_ANY;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001644 struct regulatory_request *request;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001645
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001646 mutex_lock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001647
Luis R. Rodriguez9828b012009-07-30 17:38:06 -07001648 if (unlikely(!last_request))
1649 goto out;
Luis R. Rodriguezd335fe62009-02-21 00:04:27 -05001650
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001651 /* IE len must be evenly divisible by 2 */
1652 if (country_ie_len & 0x01)
1653 goto out;
1654
1655 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1656 goto out;
1657
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001658 alpha2[0] = country_ie[0];
1659 alpha2[1] = country_ie[1];
1660
1661 if (country_ie[2] == 'I')
1662 env = ENVIRON_INDOOR;
1663 else if (country_ie[2] == 'O')
1664 env = ENVIRON_OUTDOOR;
1665
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001666 /*
Luis R. Rodriguez8b19e6c2009-07-30 17:38:09 -07001667 * We will run this only upon a successful connection on cfg80211.
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001668 * We leave conflict resolution to the workqueue, where can hold
1669 * cfg80211_mutex.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001670 */
Luis R. Rodriguezcc0b6fe2009-03-20 23:53:05 -04001671 if (likely(last_request->initiator ==
1672 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001673 wiphy_idx_valid(last_request->wiphy_idx)))
1674 goto out;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001675
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001676 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1677 if (!request)
Dan Carpenterf9f9b6e2010-07-22 13:26:50 +02001678 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001679
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001680 request->wiphy_idx = get_wiphy_idx(wiphy);
John W. Linville4f366c52010-07-15 14:57:33 -04001681 request->alpha2[0] = alpha2[0];
1682 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001683 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001684 request->country_ie_env = env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001685
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001686 mutex_unlock(&reg_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001687
1688 queue_regulatory_request(request);
1689
1690 return;
Luis R. Rodriguez0441d6f2009-02-21 00:04:29 -05001691
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001692out:
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001693 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001694}
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001695
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001696static void restore_alpha2(char *alpha2, bool reset_user)
1697{
1698 /* indicates there is no alpha2 to consider for restoration */
1699 alpha2[0] = '9';
1700 alpha2[1] = '7';
1701
1702 /* The user setting has precedence over the module parameter */
1703 if (is_user_regdom_saved()) {
1704 /* Unless we're asked to ignore it and reset it */
1705 if (reset_user) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001706 REG_DBG_PRINT("Restoring regulatory settings "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001707 "including user preference\n");
1708 user_alpha2[0] = '9';
1709 user_alpha2[1] = '7';
1710
1711 /*
1712 * If we're ignoring user settings, we still need to
1713 * check the module parameter to ensure we put things
1714 * back as they were for a full restore.
1715 */
1716 if (!is_world_regdom(ieee80211_regdom)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001717 REG_DBG_PRINT("Keeping preference on "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001718 "module parameter ieee80211_regdom: %c%c\n",
1719 ieee80211_regdom[0],
1720 ieee80211_regdom[1]);
1721 alpha2[0] = ieee80211_regdom[0];
1722 alpha2[1] = ieee80211_regdom[1];
1723 }
1724 } else {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001725 REG_DBG_PRINT("Restoring regulatory settings "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001726 "while preserving user preference for: %c%c\n",
1727 user_alpha2[0],
1728 user_alpha2[1]);
1729 alpha2[0] = user_alpha2[0];
1730 alpha2[1] = user_alpha2[1];
1731 }
1732 } else if (!is_world_regdom(ieee80211_regdom)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001733 REG_DBG_PRINT("Keeping preference on "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001734 "module parameter ieee80211_regdom: %c%c\n",
1735 ieee80211_regdom[0],
1736 ieee80211_regdom[1]);
1737 alpha2[0] = ieee80211_regdom[0];
1738 alpha2[1] = ieee80211_regdom[1];
1739 } else
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001740 REG_DBG_PRINT("Restoring regulatory settings\n");
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001741}
1742
1743/*
1744 * Restoring regulatory settings involves ingoring any
1745 * possibly stale country IE information and user regulatory
1746 * settings if so desired, this includes any beacon hints
1747 * learned as we could have traveled outside to another country
1748 * after disconnection. To restore regulatory settings we do
1749 * exactly what we did at bootup:
1750 *
1751 * - send a core regulatory hint
1752 * - send a user regulatory hint if applicable
1753 *
1754 * Device drivers that send a regulatory hint for a specific country
1755 * keep their own regulatory domain on wiphy->regd so that does does
1756 * not need to be remembered.
1757 */
1758static void restore_regulatory_settings(bool reset_user)
1759{
1760 char alpha2[2];
1761 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001762 struct regulatory_request *reg_request, *tmp;
1763 LIST_HEAD(tmp_reg_req_list);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001764
1765 mutex_lock(&cfg80211_mutex);
1766 mutex_lock(&reg_mutex);
1767
1768 reset_regdomains();
1769 restore_alpha2(alpha2, reset_user);
1770
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001771 /*
1772 * If there's any pending requests we simply
1773 * stash them to a temporary pending queue and
1774 * add then after we've restored regulatory
1775 * settings.
1776 */
1777 spin_lock(&reg_requests_lock);
1778 if (!list_empty(&reg_requests_list)) {
1779 list_for_each_entry_safe(reg_request, tmp,
1780 &reg_requests_list, list) {
1781 if (reg_request->initiator !=
1782 NL80211_REGDOM_SET_BY_USER)
1783 continue;
1784 list_del(&reg_request->list);
1785 list_add_tail(&reg_request->list, &tmp_reg_req_list);
1786 }
1787 }
1788 spin_unlock(&reg_requests_lock);
1789
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001790 /* Clear beacon hints */
1791 spin_lock_bh(&reg_pending_beacons_lock);
1792 if (!list_empty(&reg_pending_beacons)) {
1793 list_for_each_entry_safe(reg_beacon, btmp,
1794 &reg_pending_beacons, list) {
1795 list_del(&reg_beacon->list);
1796 kfree(reg_beacon);
1797 }
1798 }
1799 spin_unlock_bh(&reg_pending_beacons_lock);
1800
1801 if (!list_empty(&reg_beacon_list)) {
1802 list_for_each_entry_safe(reg_beacon, btmp,
1803 &reg_beacon_list, list) {
1804 list_del(&reg_beacon->list);
1805 kfree(reg_beacon);
1806 }
1807 }
1808
1809 /* First restore to the basic regulatory settings */
1810 cfg80211_regdomain = cfg80211_world_regdom;
1811
1812 mutex_unlock(&reg_mutex);
1813 mutex_unlock(&cfg80211_mutex);
1814
1815 regulatory_hint_core(cfg80211_regdomain->alpha2);
1816
1817 /*
1818 * This restores the ieee80211_regdom module parameter
1819 * preference or the last user requested regulatory
1820 * settings, user regulatory settings takes precedence.
1821 */
1822 if (is_an_alpha2(alpha2))
1823 regulatory_hint_user(user_alpha2);
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001824
Luis R. Rodriguez14609552011-04-05 10:49:03 -07001825 if (list_empty(&tmp_reg_req_list))
1826 return;
1827
1828 mutex_lock(&cfg80211_mutex);
1829 mutex_lock(&reg_mutex);
1830
1831 spin_lock(&reg_requests_lock);
1832 list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) {
1833 REG_DBG_PRINT("Adding request for country %c%c back "
1834 "into the queue\n",
1835 reg_request->alpha2[0],
1836 reg_request->alpha2[1]);
1837 list_del(&reg_request->list);
1838 list_add_tail(&reg_request->list, &reg_requests_list);
1839 }
1840 spin_unlock(&reg_requests_lock);
1841
1842 mutex_unlock(&reg_mutex);
1843 mutex_unlock(&cfg80211_mutex);
1844
1845 REG_DBG_PRINT("Kicking the queue\n");
1846
1847 schedule_work(&reg_work);
1848}
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001849
1850void regulatory_hint_disconnect(void)
1851{
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001852 REG_DBG_PRINT("All devices are disconnected, going to "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001853 "restore regulatory settings\n");
1854 restore_regulatory_settings(false);
1855}
1856
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001857static bool freq_is_chan_12_13_14(u16 freq)
1858{
Bruno Randolf59eb21a2011-01-17 13:37:28 +09001859 if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
1860 freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
1861 freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001862 return true;
1863 return false;
1864}
1865
1866int regulatory_hint_found_beacon(struct wiphy *wiphy,
1867 struct ieee80211_channel *beacon_chan,
1868 gfp_t gfp)
1869{
1870 struct reg_beacon *reg_beacon;
1871
1872 if (likely((beacon_chan->beacon_found ||
1873 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1874 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1875 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1876 return 0;
1877
1878 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1879 if (!reg_beacon)
1880 return -ENOMEM;
1881
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001882 REG_DBG_PRINT("Found new beacon on "
Luis R. Rodriguez4113f752010-01-04 11:50:11 -05001883 "frequency: %d MHz (Ch %d) on %s\n",
1884 beacon_chan->center_freq,
1885 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1886 wiphy_name(wiphy));
1887
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001888 memcpy(&reg_beacon->chan, beacon_chan,
1889 sizeof(struct ieee80211_channel));
1890
1891
1892 /*
1893 * Since we can be called from BH or and non-BH context
1894 * we must use spin_lock_bh()
1895 */
1896 spin_lock_bh(&reg_pending_beacons_lock);
1897 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1898 spin_unlock_bh(&reg_pending_beacons_lock);
1899
1900 schedule_work(&reg_work);
1901
1902 return 0;
1903}
1904
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001905static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001906{
1907 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001908 const struct ieee80211_reg_rule *reg_rule = NULL;
1909 const struct ieee80211_freq_range *freq_range = NULL;
1910 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001911
Joe Perchese9c02682010-11-16 19:56:49 -08001912 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001913
1914 for (i = 0; i < rd->n_reg_rules; i++) {
1915 reg_rule = &rd->reg_rules[i];
1916 freq_range = &reg_rule->freq_range;
1917 power_rule = &reg_rule->power_rule;
1918
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001919 /*
1920 * There may not be documentation for max antenna gain
1921 * in certain regions
1922 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001923 if (power_rule->max_antenna_gain)
Joe Perchese9c02682010-11-16 19:56:49 -08001924 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001925 freq_range->start_freq_khz,
1926 freq_range->end_freq_khz,
1927 freq_range->max_bandwidth_khz,
1928 power_rule->max_antenna_gain,
1929 power_rule->max_eirp);
1930 else
Joe Perchese9c02682010-11-16 19:56:49 -08001931 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001932 freq_range->start_freq_khz,
1933 freq_range->end_freq_khz,
1934 freq_range->max_bandwidth_khz,
1935 power_rule->max_eirp);
1936 }
1937}
1938
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001939static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001940{
1941
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001942 if (is_intersected_alpha2(rd->alpha2)) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001943
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001944 if (last_request->initiator ==
1945 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Johannes Berg79c97e92009-07-07 03:56:12 +02001946 struct cfg80211_registered_device *rdev;
1947 rdev = cfg80211_rdev_by_wiphy_idx(
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001948 last_request->wiphy_idx);
Johannes Berg79c97e92009-07-07 03:56:12 +02001949 if (rdev) {
Joe Perchese9c02682010-11-16 19:56:49 -08001950 pr_info("Current regulatory domain updated by AP to: %c%c\n",
Johannes Berg79c97e92009-07-07 03:56:12 +02001951 rdev->country_ie_alpha2[0],
1952 rdev->country_ie_alpha2[1]);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001953 } else
Joe Perchese9c02682010-11-16 19:56:49 -08001954 pr_info("Current regulatory domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001955 } else
Joe Perchese9c02682010-11-16 19:56:49 -08001956 pr_info("Current regulatory domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001957 } else if (is_world_regdom(rd->alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -08001958 pr_info("World regulatory domain updated:\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001959 else {
1960 if (is_unknown_alpha2(rd->alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -08001961 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001962 else
Joe Perchese9c02682010-11-16 19:56:49 -08001963 pr_info("Regulatory domain changed to country: %c%c\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001964 rd->alpha2[0], rd->alpha2[1]);
1965 }
1966 print_rd_rules(rd);
1967}
1968
Johannes Berg2df78162008-10-28 16:49:41 +01001969static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001970{
Joe Perchese9c02682010-11-16 19:56:49 -08001971 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001972 print_rd_rules(rd);
1973}
1974
Johannes Bergd2372b32008-10-24 20:32:20 +02001975/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001976static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001977{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001978 const struct ieee80211_regdomain *intersected_rd = NULL;
Johannes Berg79c97e92009-07-07 03:56:12 +02001979 struct cfg80211_registered_device *rdev = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001980 struct wiphy *request_wiphy;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001981 /* Some basic sanity checks first */
1982
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001983 if (is_world_regdom(rd->alpha2)) {
Johannes Bergf6037d02008-10-21 11:01:33 +02001984 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001985 return -EINVAL;
1986 update_world_regdomain(rd);
1987 return 0;
1988 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001989
1990 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1991 !is_unknown_alpha2(rd->alpha2))
1992 return -EINVAL;
1993
Johannes Bergf6037d02008-10-21 11:01:33 +02001994 if (!last_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001995 return -EINVAL;
1996
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001997 /*
1998 * Lets only bother proceeding on the same alpha2 if the current
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001999 * rd is non static (it means CRDA was present and was used last)
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002000 * and the pending request came in from a country IE
2001 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002002 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002003 /*
2004 * If someone else asked us to change the rd lets only bother
2005 * checking if the alpha2 changes if CRDA was already called
2006 */
John W. Linvillebaeb66f2009-12-18 17:59:02 -05002007 if (!regdom_changes(rd->alpha2))
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002008 return -EINVAL;
2009 }
2010
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002011 /*
2012 * Now lets set the regulatory domain, update all driver channels
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002013 * and finally inform them of what we have done, in case they want
2014 * to review or adjust their own settings based on their own
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002015 * internal EEPROM data
2016 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002017
Johannes Bergf6037d02008-10-21 11:01:33 +02002018 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002019 return -EINVAL;
2020
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08002021 if (!is_valid_rd(rd)) {
Joe Perchese9c02682010-11-16 19:56:49 -08002022 pr_err("Invalid regulatory domain detected:\n");
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08002023 print_regdomain_info(rd);
2024 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002025 }
2026
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002027 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
2028
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002029 if (!last_request->intersect) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002030 int r;
2031
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002032 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002033 reset_regdomains();
2034 cfg80211_regdomain = rd;
2035 return 0;
2036 }
2037
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002038 /*
2039 * For a driver hint, lets copy the regulatory domain the
2040 * driver wanted to the wiphy to deal with conflicts
2041 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002042
Luis R. Rodriguez558f6d32009-06-08 18:54:37 -07002043 /*
2044 * Userspace could have sent two replies with only
2045 * one kernel request.
2046 */
2047 if (request_wiphy->regd)
2048 return -EALREADY;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002049
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002050 r = reg_copy_regd(&request_wiphy->regd, rd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002051 if (r)
2052 return r;
2053
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002054 reset_regdomains();
2055 cfg80211_regdomain = rd;
2056 return 0;
2057 }
2058
2059 /* Intersection requires a bit more work */
2060
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002061 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002062
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002063 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2064 if (!intersected_rd)
2065 return -EINVAL;
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002066
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002067 /*
2068 * We can trash what CRDA provided now.
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002069 * However if a driver requested this specific regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002070 * domain we keep it for its private use
2071 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002072 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002073 request_wiphy->regd = rd;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002074 else
2075 kfree(rd);
2076
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002077 rd = NULL;
2078
2079 reset_regdomains();
2080 cfg80211_regdomain = intersected_rd;
2081
2082 return 0;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002083 }
2084
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002085 if (!intersected_rd)
2086 return -EINVAL;
2087
Johannes Berg79c97e92009-07-07 03:56:12 +02002088 rdev = wiphy_to_dev(request_wiphy);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002089
Johannes Berg79c97e92009-07-07 03:56:12 +02002090 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2091 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2092 rdev->env = last_request->country_ie_env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002093
2094 BUG_ON(intersected_rd == rd);
2095
2096 kfree(rd);
2097 rd = NULL;
2098
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002099 reset_regdomains();
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002100 cfg80211_regdomain = intersected_rd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002101
2102 return 0;
2103}
2104
2105
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002106/*
2107 * Use this call to set the current regulatory domain. Conflicts with
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002108 * multiple drivers can be ironed out later. Caller must've already
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002109 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2110 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002111int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002112{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002113 int r;
2114
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05002115 assert_cfg80211_lock();
2116
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002117 mutex_lock(&reg_mutex);
2118
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002119 /* Note that this doesn't update the wiphys, this is done below */
2120 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +02002121 if (r) {
2122 kfree(rd);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002123 mutex_unlock(&reg_mutex);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002124 return r;
Johannes Bergd2372b32008-10-24 20:32:20 +02002125 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002126
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002127 /* This would make this whole thing pointless */
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08002128 if (!last_request->intersect)
2129 BUG_ON(rd != cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002130
2131 /* update all wiphys now with the new established regulatory domain */
Johannes Bergf6037d02008-10-21 11:01:33 +02002132 update_all_wiphy_regulatory(last_request->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002133
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08002134 print_regdomain(cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002135
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04002136 nl80211_send_reg_change_event(last_request);
2137
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08002138 reg_set_request_processed();
2139
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002140 mutex_unlock(&reg_mutex);
2141
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002142 return r;
2143}
2144
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002145#ifdef CONFIG_HOTPLUG
2146int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2147{
2148 if (last_request && !last_request->processed) {
2149 if (add_uevent_var(env, "COUNTRY=%c%c",
2150 last_request->alpha2[0],
2151 last_request->alpha2[1]))
2152 return -ENOMEM;
2153 }
2154
2155 return 0;
2156}
2157#else
2158int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
2159{
2160 return -ENODEV;
2161}
2162#endif /* CONFIG_HOTPLUG */
2163
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002164/* Caller must hold cfg80211_mutex */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002165void reg_device_remove(struct wiphy *wiphy)
2166{
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04002167 struct wiphy *request_wiphy = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002168
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05002169 assert_cfg80211_lock();
2170
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002171 mutex_lock(&reg_mutex);
2172
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002173 kfree(wiphy->regd);
2174
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04002175 if (last_request)
2176 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002177
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002178 if (!request_wiphy || request_wiphy != wiphy)
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002179 goto out;
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002180
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002181 last_request->wiphy_idx = WIPHY_IDX_STALE;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002182 last_request->country_ie_env = ENVIRON_ANY;
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002183out:
2184 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002185}
2186
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002187static void reg_timeout_work(struct work_struct *work)
2188{
2189 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "
2190 "restoring regulatory settings");
2191 restore_regulatory_settings(true);
2192}
2193
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002194int __init regulatory_init(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002195{
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002196 int err = 0;
Johannes Berg734366d2008-09-15 10:56:48 +02002197
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002198 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2199 if (IS_ERR(reg_pdev))
2200 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002201
Scott James Remnant4d9d88d2011-03-08 10:45:30 -08002202 reg_pdev->dev.type = &reg_device_type;
2203
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002204 spin_lock_init(&reg_requests_lock);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002205 spin_lock_init(&reg_pending_beacons_lock);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002206
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002207 cfg80211_regdomain = cfg80211_world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +02002208
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05002209 user_alpha2[0] = '9';
2210 user_alpha2[1] = '7';
2211
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002212 /* We always try to get an update for the static regdomain */
2213 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002214 if (err) {
2215 if (err == -ENOMEM)
2216 return err;
2217 /*
2218 * N.B. kobject_uevent_env() can fail mainly for when we're out
2219 * memory which is handled and propagated appropriately above
2220 * but it can also fail during a netlink_broadcast() or during
2221 * early boot for call_usermodehelper(). For now treat these
2222 * errors as non-fatal.
2223 */
Joe Perchese9c02682010-11-16 19:56:49 -08002224 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002225#ifdef CONFIG_CFG80211_REG_DEBUG
2226 /* We want to find out exactly why when debugging */
2227 WARN_ON(err);
2228#endif
2229 }
Johannes Berg734366d2008-09-15 10:56:48 +02002230
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002231 /*
2232 * Finally, if the user set the module parameter treat it
2233 * as a user hint.
2234 */
2235 if (!is_world_regdom(ieee80211_regdom))
2236 regulatory_hint_user(ieee80211_regdom);
2237
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002238 return 0;
2239}
2240
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002241void /* __init_or_exit */ regulatory_exit(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002242{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002243 struct regulatory_request *reg_request, *tmp;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002244 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002245
2246 cancel_work_sync(&reg_work);
Luis R. Rodrigueza90c7a32011-04-05 10:49:04 -07002247 cancel_delayed_work_sync(&reg_timeout);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002248
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002249 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002250 mutex_lock(&reg_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +02002251
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002252 reset_regdomains();
Johannes Berg734366d2008-09-15 10:56:48 +02002253
Johannes Bergf6037d02008-10-21 11:01:33 +02002254 kfree(last_request);
2255
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002256 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002257
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002258 spin_lock_bh(&reg_pending_beacons_lock);
2259 if (!list_empty(&reg_pending_beacons)) {
2260 list_for_each_entry_safe(reg_beacon, btmp,
2261 &reg_pending_beacons, list) {
2262 list_del(&reg_beacon->list);
2263 kfree(reg_beacon);
2264 }
2265 }
2266 spin_unlock_bh(&reg_pending_beacons_lock);
2267
2268 if (!list_empty(&reg_beacon_list)) {
2269 list_for_each_entry_safe(reg_beacon, btmp,
2270 &reg_beacon_list, list) {
2271 list_del(&reg_beacon->list);
2272 kfree(reg_beacon);
2273 }
2274 }
2275
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002276 spin_lock(&reg_requests_lock);
2277 if (!list_empty(&reg_requests_list)) {
2278 list_for_each_entry_safe(reg_request, tmp,
2279 &reg_requests_list, list) {
2280 list_del(&reg_request->list);
2281 kfree(reg_request);
2282 }
2283 }
2284 spin_unlock(&reg_requests_lock);
2285
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002286 mutex_unlock(&reg_mutex);
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002287 mutex_unlock(&cfg80211_mutex);
Johannes Berg8318d782008-01-24 19:38:38 +01002288}