blob: 99d41831d76e3f4646286ab15028ebc35e2706dd [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
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050066/*
67 * Central wireless core regulatory domains, we only need two,
Johannes Berg734366d2008-09-15 10:56:48 +020068 * the current one and a world regulatory domain in case we have no
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050069 * information to give us an alpha2
70 */
Luis R. Rodriguezf1303472009-01-30 09:26:42 -080071const struct ieee80211_regdomain *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +020072
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050073/*
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070074 * Protects static reg.c components:
75 * - cfg80211_world_regdom
76 * - cfg80211_regdom
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070077 * - last_request
78 */
John W. Linville670b7f12010-06-24 11:26:31 -040079static DEFINE_MUTEX(reg_mutex);
Johannes Berg46a5eba2010-09-15 13:28:15 +020080
81static inline void assert_reg_lock(void)
82{
83 lockdep_assert_held(&reg_mutex);
84}
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070085
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -050086/* Used to queue up regulatory hints */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -050087static LIST_HEAD(reg_requests_list);
88static spinlock_t reg_requests_lock;
89
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -050090/* Used to queue up beacon hints for review */
91static LIST_HEAD(reg_pending_beacons);
92static spinlock_t reg_pending_beacons_lock;
93
94/* Used to keep track of processed beacon hints */
95static LIST_HEAD(reg_beacon_list);
96
97struct reg_beacon {
98 struct list_head list;
99 struct ieee80211_channel chan;
100};
101
Luis R. Rodriguezf333a7a2010-11-17 21:46:07 -0800102static void reg_todo(struct work_struct *work);
103static DECLARE_WORK(reg_work, reg_todo);
104
Johannes Berg734366d2008-09-15 10:56:48 +0200105/* We keep a static world regulatory domain in case of the absence of CRDA */
106static const struct ieee80211_regdomain world_regdom = {
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800107 .n_reg_rules = 5,
Johannes Berg734366d2008-09-15 10:56:48 +0200108 .alpha2 = "00",
109 .reg_rules = {
Luis R. Rodriguez68798a62009-02-21 00:20:37 -0500110 /* IEEE 802.11b/g, channels 1..11 */
111 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800112 /* IEEE 802.11b/g, channels 12..13. No HT40
113 * channel fits here. */
114 REG_RULE(2467-10, 2472+10, 20, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500115 NL80211_RRF_PASSIVE_SCAN |
116 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800117 /* IEEE 802.11 channel 14 - Only JP enables
118 * this and for 802.11b only */
119 REG_RULE(2484-10, 2484+10, 20, 6, 20,
120 NL80211_RRF_PASSIVE_SCAN |
121 NL80211_RRF_NO_IBSS |
122 NL80211_RRF_NO_OFDM),
123 /* IEEE 802.11a, channel 36..48 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800124 REG_RULE(5180-10, 5240+10, 40, 6, 20,
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800125 NL80211_RRF_PASSIVE_SCAN |
126 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500127
128 /* NB: 5260 MHz - 5700 MHz requies DFS */
129
130 /* IEEE 802.11a, channel 149..165 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800131 REG_RULE(5745-10, 5825+10, 40, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500132 NL80211_RRF_PASSIVE_SCAN |
133 NL80211_RRF_NO_IBSS),
Johannes Berg734366d2008-09-15 10:56:48 +0200134 }
135};
136
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200137static const struct ieee80211_regdomain *cfg80211_world_regdom =
138 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200139
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400140static char *ieee80211_regdom = "00";
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500141static char user_alpha2[2];
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400142
Johannes Berg734366d2008-09-15 10:56:48 +0200143module_param(ieee80211_regdom, charp, 0444);
144MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
145
Johannes Berg734366d2008-09-15 10:56:48 +0200146static void reset_regdomains(void)
147{
Johannes Berg942b25c2008-09-15 11:26:47 +0200148 /* avoid freeing static information or freeing something twice */
149 if (cfg80211_regdomain == cfg80211_world_regdom)
150 cfg80211_regdomain = NULL;
151 if (cfg80211_world_regdom == &world_regdom)
152 cfg80211_world_regdom = NULL;
153 if (cfg80211_regdomain == &world_regdom)
154 cfg80211_regdomain = NULL;
Johannes Berg942b25c2008-09-15 11:26:47 +0200155
156 kfree(cfg80211_regdomain);
157 kfree(cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200158
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200159 cfg80211_world_regdom = &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200160 cfg80211_regdomain = NULL;
161}
162
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500163/*
164 * Dynamic world regulatory domain requested by the wireless
165 * core upon initialization
166 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200167static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200168{
Johannes Bergf6037d02008-10-21 11:01:33 +0200169 BUG_ON(!last_request);
Johannes Berg734366d2008-09-15 10:56:48 +0200170
171 reset_regdomains();
172
173 cfg80211_world_regdom = rd;
174 cfg80211_regdomain = rd;
175}
Johannes Berg734366d2008-09-15 10:56:48 +0200176
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200177bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100178{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700179 if (!alpha2)
180 return false;
181 if (alpha2[0] == '0' && alpha2[1] == '0')
182 return true;
183 return false;
Johannes Berg8318d782008-01-24 19:38:38 +0100184}
185
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200186static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700187{
188 if (!alpha2)
189 return false;
190 if (alpha2[0] != 0 && alpha2[1] != 0)
191 return true;
192 return false;
193}
Johannes Berg8318d782008-01-24 19:38:38 +0100194
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200195static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700196{
197 if (!alpha2)
198 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500199 /*
200 * Special case where regulatory domain was built by driver
201 * but a specific alpha2 cannot be determined
202 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700203 if (alpha2[0] == '9' && alpha2[1] == '9')
204 return true;
205 return false;
206}
207
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800208static bool is_intersected_alpha2(const char *alpha2)
209{
210 if (!alpha2)
211 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500212 /*
213 * Special case where regulatory domain is the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800214 * result of an intersection between two regulatory domain
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500215 * structures
216 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800217 if (alpha2[0] == '9' && alpha2[1] == '8')
218 return true;
219 return false;
220}
221
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200222static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700223{
224 if (!alpha2)
225 return false;
John W. Linvillec61029c2010-08-05 14:26:24 -0400226 if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700227 return true;
228 return false;
229}
230
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200231static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700232{
233 if (!alpha2_x || !alpha2_y)
234 return false;
235 if (alpha2_x[0] == alpha2_y[0] &&
236 alpha2_x[1] == alpha2_y[1])
237 return true;
238 return false;
239}
240
Luis R. Rodriguez69b15722009-02-21 00:04:33 -0500241static bool regdom_changes(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700242{
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500243 assert_cfg80211_lock();
244
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700245 if (!cfg80211_regdomain)
246 return true;
247 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
248 return false;
249 return true;
250}
251
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500252/*
253 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
254 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
255 * has ever been issued.
256 */
257static bool is_user_regdom_saved(void)
258{
259 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
260 return false;
261
262 /* This would indicate a mistake on the design */
263 if (WARN((!is_world_regdom(user_alpha2) &&
264 !is_an_alpha2(user_alpha2)),
265 "Unexpected user alpha2: %c%c\n",
266 user_alpha2[0],
267 user_alpha2[1]))
268 return false;
269
270 return true;
271}
272
John W. Linville3b377ea2009-12-18 17:59:01 -0500273static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
274 const struct ieee80211_regdomain *src_regd)
275{
276 struct ieee80211_regdomain *regd;
277 int size_of_regd = 0;
278 unsigned int i;
279
280 size_of_regd = sizeof(struct ieee80211_regdomain) +
281 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
282
283 regd = kzalloc(size_of_regd, GFP_KERNEL);
284 if (!regd)
285 return -ENOMEM;
286
287 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
288
289 for (i = 0; i < src_regd->n_reg_rules; i++)
290 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
291 sizeof(struct ieee80211_reg_rule));
292
293 *dst_regd = regd;
294 return 0;
295}
296
297#ifdef CONFIG_CFG80211_INTERNAL_REGDB
298struct reg_regdb_search_request {
299 char alpha2[2];
300 struct list_head list;
301};
302
303static LIST_HEAD(reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400304static DEFINE_MUTEX(reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500305
306static void reg_regdb_search(struct work_struct *work)
307{
308 struct reg_regdb_search_request *request;
309 const struct ieee80211_regdomain *curdom, *regdom;
310 int i, r;
311
John W. Linville368d06f2010-03-16 15:40:59 -0400312 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500313 while (!list_empty(&reg_regdb_search_list)) {
314 request = list_first_entry(&reg_regdb_search_list,
315 struct reg_regdb_search_request,
316 list);
317 list_del(&request->list);
318
319 for (i=0; i<reg_regdb_size; i++) {
320 curdom = reg_regdb[i];
321
322 if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
323 r = reg_copy_regd(&regdom, curdom);
324 if (r)
325 break;
John W. Linville3b377ea2009-12-18 17:59:01 -0500326 mutex_lock(&cfg80211_mutex);
327 set_regdom(regdom);
328 mutex_unlock(&cfg80211_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500329 break;
330 }
331 }
332
333 kfree(request);
334 }
John W. Linville368d06f2010-03-16 15:40:59 -0400335 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500336}
337
338static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
339
340static void reg_regdb_query(const char *alpha2)
341{
342 struct reg_regdb_search_request *request;
343
344 if (!alpha2)
345 return;
346
347 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
348 if (!request)
349 return;
350
351 memcpy(request->alpha2, alpha2, 2);
352
John W. Linville368d06f2010-03-16 15:40:59 -0400353 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500354 list_add_tail(&request->list, &reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400355 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500356
357 schedule_work(&reg_regdb_work);
358}
359#else
360static inline void reg_regdb_query(const char *alpha2) {}
361#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
362
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500363/*
364 * This lets us keep regulatory code which is updated on a regulatory
365 * basis in userspace.
366 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700367static int call_crda(const char *alpha2)
368{
369 char country_env[9 + 2] = "COUNTRY=";
370 char *envp[] = {
371 country_env,
372 NULL
373 };
374
375 if (!is_world_regdom((char *) alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -0800376 pr_info("Calling CRDA for country: %c%c\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700377 alpha2[0], alpha2[1]);
378 else
Joe Perchese9c02682010-11-16 19:56:49 -0800379 pr_info("Calling CRDA to update world regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700380
John W. Linville3b377ea2009-12-18 17:59:01 -0500381 /* query internal regulatory database (if it exists) */
382 reg_regdb_query(alpha2);
383
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700384 country_env[8] = alpha2[0];
385 country_env[9] = alpha2[1];
386
387 return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
388}
389
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700390/* Used by nl80211 before kmalloc'ing our regulatory domain */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200391bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700392{
Luis R. Rodriguez61405e92009-05-13 17:04:41 -0400393 assert_cfg80211_lock();
394
Johannes Bergf6037d02008-10-21 11:01:33 +0200395 if (!last_request)
396 return false;
397
398 return alpha2_equal(last_request->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700399}
400
401/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200402static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700403{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200404 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700405 u32 freq_diff;
406
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800407 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700408 return false;
409
410 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
411 return false;
412
413 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
414
Roel Kluinbd05f282009-03-03 22:55:21 +0100415 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
416 freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700417 return false;
418
419 return true;
420}
421
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200422static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700423{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200424 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700425 unsigned int i;
426
427 if (!rd->n_reg_rules)
428 return false;
429
Luis R. Rodriguez88dc1c32008-11-12 14:22:01 -0800430 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
431 return false;
432
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700433 for (i = 0; i < rd->n_reg_rules; i++) {
434 reg_rule = &rd->reg_rules[i];
435 if (!is_valid_reg_rule(reg_rule))
436 return false;
437 }
438
439 return true;
440}
441
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400442static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
443 u32 center_freq_khz,
444 u32 bw_khz)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700445{
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400446 u32 start_freq_khz, end_freq_khz;
447
448 start_freq_khz = center_freq_khz - (bw_khz/2);
449 end_freq_khz = center_freq_khz + (bw_khz/2);
450
451 if (start_freq_khz >= freq_range->start_freq_khz &&
452 end_freq_khz <= freq_range->end_freq_khz)
453 return true;
454
455 return false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700456}
457
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800458/**
459 * freq_in_rule_band - tells us if a frequency is in a frequency band
460 * @freq_range: frequency rule we want to query
461 * @freq_khz: frequency we are inquiring about
462 *
463 * This lets us know if a specific frequency rule is or is not relevant to
464 * a specific frequency's band. Bands are device specific and artificial
465 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
466 * safe for now to assume that a frequency rule should not be part of a
467 * frequency's band if the start freq or end freq are off by more than 2 GHz.
468 * This resolution can be lowered and should be considered as we add
469 * regulatory rule support for other "bands".
470 **/
471static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
472 u32 freq_khz)
473{
474#define ONE_GHZ_IN_KHZ 1000000
475 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
476 return true;
477 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
478 return true;
479 return false;
480#undef ONE_GHZ_IN_KHZ
481}
482
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500483/*
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500484 * Helper for regdom_intersect(), this does the real
485 * mathematical intersection fun
486 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700487static int reg_rules_intersect(
488 const struct ieee80211_reg_rule *rule1,
489 const struct ieee80211_reg_rule *rule2,
490 struct ieee80211_reg_rule *intersected_rule)
491{
492 const struct ieee80211_freq_range *freq_range1, *freq_range2;
493 struct ieee80211_freq_range *freq_range;
494 const struct ieee80211_power_rule *power_rule1, *power_rule2;
495 struct ieee80211_power_rule *power_rule;
496 u32 freq_diff;
497
498 freq_range1 = &rule1->freq_range;
499 freq_range2 = &rule2->freq_range;
500 freq_range = &intersected_rule->freq_range;
501
502 power_rule1 = &rule1->power_rule;
503 power_rule2 = &rule2->power_rule;
504 power_rule = &intersected_rule->power_rule;
505
506 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
507 freq_range2->start_freq_khz);
508 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
509 freq_range2->end_freq_khz);
510 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
511 freq_range2->max_bandwidth_khz);
512
513 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
514 if (freq_range->max_bandwidth_khz > freq_diff)
515 freq_range->max_bandwidth_khz = freq_diff;
516
517 power_rule->max_eirp = min(power_rule1->max_eirp,
518 power_rule2->max_eirp);
519 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
520 power_rule2->max_antenna_gain);
521
522 intersected_rule->flags = (rule1->flags | rule2->flags);
523
524 if (!is_valid_reg_rule(intersected_rule))
525 return -EINVAL;
526
527 return 0;
528}
529
530/**
531 * regdom_intersect - do the intersection between two regulatory domains
532 * @rd1: first regulatory domain
533 * @rd2: second regulatory domain
534 *
535 * Use this function to get the intersection between two regulatory domains.
536 * Once completed we will mark the alpha2 for the rd as intersected, "98",
537 * as no one single alpha2 can represent this regulatory domain.
538 *
539 * Returns a pointer to the regulatory domain structure which will hold the
540 * resulting intersection of rules between rd1 and rd2. We will
541 * kzalloc() this structure for you.
542 */
543static struct ieee80211_regdomain *regdom_intersect(
544 const struct ieee80211_regdomain *rd1,
545 const struct ieee80211_regdomain *rd2)
546{
547 int r, size_of_regd;
548 unsigned int x, y;
549 unsigned int num_rules = 0, rule_idx = 0;
550 const struct ieee80211_reg_rule *rule1, *rule2;
551 struct ieee80211_reg_rule *intersected_rule;
552 struct ieee80211_regdomain *rd;
553 /* This is just a dummy holder to help us count */
554 struct ieee80211_reg_rule irule;
555
556 /* Uses the stack temporarily for counter arithmetic */
557 intersected_rule = &irule;
558
559 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
560
561 if (!rd1 || !rd2)
562 return NULL;
563
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500564 /*
565 * First we get a count of the rules we'll need, then we actually
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700566 * build them. This is to so we can malloc() and free() a
567 * regdomain once. The reason we use reg_rules_intersect() here
568 * is it will return -EINVAL if the rule computed makes no sense.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500569 * All rules that do check out OK are valid.
570 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700571
572 for (x = 0; x < rd1->n_reg_rules; x++) {
573 rule1 = &rd1->reg_rules[x];
574 for (y = 0; y < rd2->n_reg_rules; y++) {
575 rule2 = &rd2->reg_rules[y];
576 if (!reg_rules_intersect(rule1, rule2,
577 intersected_rule))
578 num_rules++;
579 memset(intersected_rule, 0,
580 sizeof(struct ieee80211_reg_rule));
581 }
582 }
583
584 if (!num_rules)
585 return NULL;
586
587 size_of_regd = sizeof(struct ieee80211_regdomain) +
588 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
589
590 rd = kzalloc(size_of_regd, GFP_KERNEL);
591 if (!rd)
592 return NULL;
593
594 for (x = 0; x < rd1->n_reg_rules; x++) {
595 rule1 = &rd1->reg_rules[x];
596 for (y = 0; y < rd2->n_reg_rules; y++) {
597 rule2 = &rd2->reg_rules[y];
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500598 /*
599 * This time around instead of using the stack lets
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700600 * write to the target rule directly saving ourselves
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500601 * a memcpy()
602 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700603 intersected_rule = &rd->reg_rules[rule_idx];
604 r = reg_rules_intersect(rule1, rule2,
605 intersected_rule);
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500606 /*
607 * No need to memset here the intersected rule here as
608 * we're not using the stack anymore
609 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700610 if (r)
611 continue;
612 rule_idx++;
613 }
614 }
615
616 if (rule_idx != num_rules) {
617 kfree(rd);
618 return NULL;
619 }
620
621 rd->n_reg_rules = num_rules;
622 rd->alpha2[0] = '9';
623 rd->alpha2[1] = '8';
624
625 return rd;
626}
627
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500628/*
629 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
630 * want to just have the channel structure use these
631 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700632static u32 map_regdom_flags(u32 rd_flags)
633{
634 u32 channel_flags = 0;
635 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
636 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
637 if (rd_flags & NL80211_RRF_NO_IBSS)
638 channel_flags |= IEEE80211_CHAN_NO_IBSS;
639 if (rd_flags & NL80211_RRF_DFS)
640 channel_flags |= IEEE80211_CHAN_RADAR;
641 return channel_flags;
642}
643
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800644static int freq_reg_info_regd(struct wiphy *wiphy,
645 u32 center_freq,
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400646 u32 desired_bw_khz,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800647 const struct ieee80211_reg_rule **reg_rule,
648 const struct ieee80211_regdomain *custom_regd)
Johannes Berg8318d782008-01-24 19:38:38 +0100649{
650 int i;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800651 bool band_rule_found = false;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800652 const struct ieee80211_regdomain *regd;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400653 bool bw_fits = false;
654
655 if (!desired_bw_khz)
656 desired_bw_khz = MHZ_TO_KHZ(20);
Johannes Berg8318d782008-01-24 19:38:38 +0100657
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800658 regd = custom_regd ? custom_regd : cfg80211_regdomain;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800659
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500660 /*
661 * Follow the driver's regulatory domain, if present, unless a country
662 * IE has been processed or a user wants to help complaince further
663 */
Luis R. Rodriguez2784fe92010-12-15 19:24:11 -0800664 if (!custom_regd &&
665 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400666 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800667 wiphy->regd)
668 regd = wiphy->regd;
669
670 if (!regd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700671 return -EINVAL;
672
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800673 for (i = 0; i < regd->n_reg_rules; i++) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700674 const struct ieee80211_reg_rule *rr;
675 const struct ieee80211_freq_range *fr = NULL;
676 const struct ieee80211_power_rule *pr = NULL;
677
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800678 rr = &regd->reg_rules[i];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700679 fr = &rr->freq_range;
680 pr = &rr->power_rule;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800681
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500682 /*
683 * We only need to know if one frequency rule was
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800684 * was in center_freq's band, that's enough, so lets
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500685 * not overwrite it once found
686 */
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800687 if (!band_rule_found)
688 band_rule_found = freq_in_rule_band(fr, center_freq);
689
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400690 bw_fits = reg_does_bw_fit(fr,
691 center_freq,
692 desired_bw_khz);
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800693
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400694 if (band_rule_found && bw_fits) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700695 *reg_rule = rr;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400696 return 0;
Johannes Berg8318d782008-01-24 19:38:38 +0100697 }
698 }
699
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800700 if (!band_rule_found)
701 return -ERANGE;
702
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400703 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700704}
705
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400706int freq_reg_info(struct wiphy *wiphy,
707 u32 center_freq,
708 u32 desired_bw_khz,
709 const struct ieee80211_reg_rule **reg_rule)
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800710{
Luis R. Rodriguezac46d482009-05-01 18:44:50 -0400711 assert_cfg80211_lock();
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400712 return freq_reg_info_regd(wiphy,
713 center_freq,
714 desired_bw_khz,
715 reg_rule,
716 NULL);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800717}
John W. Linville4f366c52010-07-15 14:57:33 -0400718EXPORT_SYMBOL(freq_reg_info);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700719
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530720#ifdef CONFIG_CFG80211_REG_DEBUG
721static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
722{
723 switch (initiator) {
724 case NL80211_REGDOM_SET_BY_CORE:
725 return "Set by core";
726 case NL80211_REGDOM_SET_BY_USER:
727 return "Set by user";
728 case NL80211_REGDOM_SET_BY_DRIVER:
729 return "Set by driver";
730 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
731 return "Set by country IE";
732 default:
733 WARN_ON(1);
734 return "Set by bug";
735 }
736}
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530737
738static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
739 u32 desired_bw_khz,
740 const struct ieee80211_reg_rule *reg_rule)
741{
742 const struct ieee80211_power_rule *power_rule;
743 const struct ieee80211_freq_range *freq_range;
744 char max_antenna_gain[32];
745
746 power_rule = &reg_rule->power_rule;
747 freq_range = &reg_rule->freq_range;
748
749 if (!power_rule->max_antenna_gain)
750 snprintf(max_antenna_gain, 32, "N/A");
751 else
752 snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
753
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700754 REG_DBG_PRINT("Updating information on frequency %d MHz "
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530755 "for %d a MHz width channel with regulatory rule:\n",
756 chan->center_freq,
757 KHZ_TO_MHZ(desired_bw_khz));
758
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700759 REG_DBG_PRINT("%d KHz - %d KHz @ KHz), (%s mBi, %d mBm)\n",
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530760 freq_range->start_freq_khz,
761 freq_range->end_freq_khz,
762 max_antenna_gain,
763 power_rule->max_eirp);
764}
765#else
766static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
767 u32 desired_bw_khz,
768 const struct ieee80211_reg_rule *reg_rule)
769{
770 return;
771}
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530772#endif
773
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400774/*
775 * Note that right now we assume the desired channel bandwidth
776 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
777 * per channel, the primary and the extension channel). To support
778 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
779 * new ieee80211_channel.target_bw and re run the regulatory check
780 * on the wiphy with the target_bw specified. Then we can simply use
781 * that below for the desired_bw_khz below.
782 */
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700783static void handle_channel(struct wiphy *wiphy,
784 enum nl80211_reg_initiator initiator,
785 enum ieee80211_band band,
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800786 unsigned int chan_idx)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700787{
788 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400789 u32 flags, bw_flags = 0;
790 u32 desired_bw_khz = MHZ_TO_KHZ(20);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700791 const struct ieee80211_reg_rule *reg_rule = NULL;
792 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400793 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800794 struct ieee80211_supported_band *sband;
795 struct ieee80211_channel *chan;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500796 struct wiphy *request_wiphy = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800797
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500798 assert_cfg80211_lock();
799
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500800 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
801
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800802 sband = wiphy->bands[band];
803 BUG_ON(chan_idx >= sband->n_channels);
804 chan = &sband->channels[chan_idx];
805
806 flags = chan->orig_flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700807
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400808 r = freq_reg_info(wiphy,
809 MHZ_TO_KHZ(chan->center_freq),
810 desired_bw_khz,
811 &reg_rule);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700812
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700813 if (r) {
814 /*
815 * We will disable all channels that do not match our
816 * recieved regulatory rule unless the hint is coming
817 * from a Country IE and the Country IE had no information
818 * about a band. The IEEE 802.11 spec allows for an AP
819 * to send only a subset of the regulatory rules allowed,
820 * so an AP in the US that only supports 2.4 GHz may only send
821 * a country IE with information for the 2.4 GHz band
822 * while 5 GHz is still supported.
823 */
824 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
825 r == -ERANGE)
826 return;
827
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700828 REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700829 chan->flags = IEEE80211_CHAN_DISABLED;
Johannes Berg8318d782008-01-24 19:38:38 +0100830 return;
Luis R. Rodriguezca4ffe82010-10-20 10:18:55 -0700831 }
Johannes Berg8318d782008-01-24 19:38:38 +0100832
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +0530833 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
834
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700835 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400836 freq_range = &reg_rule->freq_range;
837
838 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
839 bw_flags = IEEE80211_CHAN_NO_HT40;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700840
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400841 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500842 request_wiphy && request_wiphy == wiphy &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100843 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500844 /*
845 * This gaurantees the driver's requested regulatory domain
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800846 * will always be used as a base for further regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500847 * settings
848 */
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800849 chan->flags = chan->orig_flags =
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400850 map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800851 chan->max_antenna_gain = chan->orig_mag =
852 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800853 chan->max_power = chan->orig_mpwr =
854 (int) MBM_TO_DBM(power_rule->max_eirp);
855 return;
856 }
857
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400858 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
Johannes Berg8318d782008-01-24 19:38:38 +0100859 chan->max_antenna_gain = min(chan->orig_mag,
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700860 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
John W. Linville253898c2008-04-03 15:32:54 -0400861 if (chan->orig_mpwr)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700862 chan->max_power = min(chan->orig_mpwr,
863 (int) MBM_TO_DBM(power_rule->max_eirp));
John W. Linville253898c2008-04-03 15:32:54 -0400864 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700865 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
Johannes Berg8318d782008-01-24 19:38:38 +0100866}
867
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700868static void handle_band(struct wiphy *wiphy,
869 enum ieee80211_band band,
870 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +0100871{
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800872 unsigned int i;
873 struct ieee80211_supported_band *sband;
874
875 BUG_ON(!wiphy->bands[band]);
876 sband = wiphy->bands[band];
Johannes Berg8318d782008-01-24 19:38:38 +0100877
878 for (i = 0; i < sband->n_channels; i++)
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -0700879 handle_channel(wiphy, initiator, band, i);
Johannes Berg8318d782008-01-24 19:38:38 +0100880}
881
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400882static bool ignore_reg_update(struct wiphy *wiphy,
883 enum nl80211_reg_initiator initiator)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800884{
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530885 if (!last_request) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700886 REG_DBG_PRINT("Ignoring regulatory request %s since "
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530887 "last_request is not set\n",
888 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800889 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530890 }
891
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400892 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530893 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700894 REG_DBG_PRINT("Ignoring regulatory request %s "
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530895 "since the driver uses its own custom "
896 "regulatory domain ",
897 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800898 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530899 }
900
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500901 /*
902 * wiphy->regd will be set once the device has its own
903 * desired regulatory domain set
904 */
Johannes Berg5be83de2009-11-19 00:56:28 +0100905 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
Luis R. Rodriguez749b5272010-10-20 10:18:54 -0700906 initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530907 !is_world_regdom(last_request->alpha2)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -0700908 REG_DBG_PRINT("Ignoring regulatory request %s "
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530909 "since the driver requires its own regulaotry "
910 "domain to be set first",
911 reg_initiator_name(initiator));
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800912 return true;
Luis R. Rodriguez926a0a02010-10-21 19:17:03 +0530913 }
914
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800915 return false;
916}
917
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400918static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700919{
Johannes Berg79c97e92009-07-07 03:56:12 +0200920 struct cfg80211_registered_device *rdev;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700921
Johannes Berg79c97e92009-07-07 03:56:12 +0200922 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
923 wiphy_update_regulatory(&rdev->wiphy, initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700924}
925
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500926static void handle_reg_beacon(struct wiphy *wiphy,
927 unsigned int chan_idx,
928 struct reg_beacon *reg_beacon)
929{
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500930 struct ieee80211_supported_band *sband;
931 struct ieee80211_channel *chan;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400932 bool channel_changed = false;
933 struct ieee80211_channel chan_before;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500934
935 assert_cfg80211_lock();
936
937 sband = wiphy->bands[reg_beacon->chan.band];
938 chan = &sband->channels[chan_idx];
939
940 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
941 return;
942
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400943 if (chan->beacon_found)
944 return;
945
946 chan->beacon_found = true;
947
Johannes Berg5be83de2009-11-19 00:56:28 +0100948 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700949 return;
950
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400951 chan_before.center_freq = chan->center_freq;
952 chan_before.flags = chan->flags;
953
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700954 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500955 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400956 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500957 }
958
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700959 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500960 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400961 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500962 }
963
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400964 if (channel_changed)
965 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500966}
967
968/*
969 * Called when a scan on a wiphy finds a beacon on
970 * new channel
971 */
972static void wiphy_update_new_beacon(struct wiphy *wiphy,
973 struct reg_beacon *reg_beacon)
974{
975 unsigned int i;
976 struct ieee80211_supported_band *sband;
977
978 assert_cfg80211_lock();
979
980 if (!wiphy->bands[reg_beacon->chan.band])
981 return;
982
983 sband = wiphy->bands[reg_beacon->chan.band];
984
985 for (i = 0; i < sband->n_channels; i++)
986 handle_reg_beacon(wiphy, i, reg_beacon);
987}
988
989/*
990 * Called upon reg changes or a new wiphy is added
991 */
992static void wiphy_update_beacon_reg(struct wiphy *wiphy)
993{
994 unsigned int i;
995 struct ieee80211_supported_band *sband;
996 struct reg_beacon *reg_beacon;
997
998 assert_cfg80211_lock();
999
1000 if (list_empty(&reg_beacon_list))
1001 return;
1002
1003 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
1004 if (!wiphy->bands[reg_beacon->chan.band])
1005 continue;
1006 sband = wiphy->bands[reg_beacon->chan.band];
1007 for (i = 0; i < sband->n_channels; i++)
1008 handle_reg_beacon(wiphy, i, reg_beacon);
1009 }
1010}
1011
1012static bool reg_is_world_roaming(struct wiphy *wiphy)
1013{
1014 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
1015 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
1016 return true;
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -04001017 if (last_request &&
1018 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Johannes Berg5be83de2009-11-19 00:56:28 +01001019 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001020 return true;
1021 return false;
1022}
1023
1024/* Reap the advantages of previously found beacons */
1025static void reg_process_beacons(struct wiphy *wiphy)
1026{
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -04001027 /*
1028 * Means we are just firing up cfg80211, so no beacons would
1029 * have been processed yet.
1030 */
1031 if (!last_request)
1032 return;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001033 if (!reg_is_world_roaming(wiphy))
1034 return;
1035 wiphy_update_beacon_reg(wiphy);
1036}
1037
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001038static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
1039{
1040 if (!chan)
1041 return true;
1042 if (chan->flags & IEEE80211_CHAN_DISABLED)
1043 return true;
1044 /* This would happen when regulatory rules disallow HT40 completely */
1045 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
1046 return true;
1047 return false;
1048}
1049
1050static void reg_process_ht_flags_channel(struct wiphy *wiphy,
1051 enum ieee80211_band band,
1052 unsigned int chan_idx)
1053{
1054 struct ieee80211_supported_band *sband;
1055 struct ieee80211_channel *channel;
1056 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
1057 unsigned int i;
1058
1059 assert_cfg80211_lock();
1060
1061 sband = wiphy->bands[band];
1062 BUG_ON(chan_idx >= sband->n_channels);
1063 channel = &sband->channels[chan_idx];
1064
1065 if (is_ht40_not_allowed(channel)) {
1066 channel->flags |= IEEE80211_CHAN_NO_HT40;
1067 return;
1068 }
1069
1070 /*
1071 * We need to ensure the extension channels exist to
1072 * be able to use HT40- or HT40+, this finds them (or not)
1073 */
1074 for (i = 0; i < sband->n_channels; i++) {
1075 struct ieee80211_channel *c = &sband->channels[i];
1076 if (c->center_freq == (channel->center_freq - 20))
1077 channel_before = c;
1078 if (c->center_freq == (channel->center_freq + 20))
1079 channel_after = c;
1080 }
1081
1082 /*
1083 * Please note that this assumes target bandwidth is 20 MHz,
1084 * if that ever changes we also need to change the below logic
1085 * to include that as well.
1086 */
1087 if (is_ht40_not_allowed(channel_before))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001088 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001089 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001090 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001091
1092 if (is_ht40_not_allowed(channel_after))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001093 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001094 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -04001095 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001096}
1097
1098static void reg_process_ht_flags_band(struct wiphy *wiphy,
1099 enum ieee80211_band band)
1100{
1101 unsigned int i;
1102 struct ieee80211_supported_band *sband;
1103
1104 BUG_ON(!wiphy->bands[band]);
1105 sband = wiphy->bands[band];
1106
1107 for (i = 0; i < sband->n_channels; i++)
1108 reg_process_ht_flags_channel(wiphy, band, i);
1109}
1110
1111static void reg_process_ht_flags(struct wiphy *wiphy)
1112{
1113 enum ieee80211_band band;
1114
1115 if (!wiphy)
1116 return;
1117
1118 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1119 if (wiphy->bands[band])
1120 reg_process_ht_flags_band(wiphy, band);
1121 }
1122
1123}
1124
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001125void wiphy_update_regulatory(struct wiphy *wiphy,
1126 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +01001127{
1128 enum ieee80211_band band;
Luis R. Rodriguezd46e5b12009-01-22 15:05:50 -08001129
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001130 if (ignore_reg_update(wiphy, initiator))
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001131 goto out;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001132 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Johannes Berg8318d782008-01-24 19:38:38 +01001133 if (wiphy->bands[band])
Luis R. Rodriguez7ca43d02010-10-20 10:18:53 -07001134 handle_band(wiphy, band, initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001135 }
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001136out:
1137 reg_process_beacons(wiphy);
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001138 reg_process_ht_flags(wiphy);
Luis R. Rodriguez560e28e2009-01-07 17:43:32 -08001139 if (wiphy->reg_notifier)
Luis R. Rodriguez716f9392009-01-22 15:05:51 -08001140 wiphy->reg_notifier(wiphy, last_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001141}
1142
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001143static void handle_channel_custom(struct wiphy *wiphy,
1144 enum ieee80211_band band,
1145 unsigned int chan_idx,
1146 const struct ieee80211_regdomain *regd)
1147{
1148 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001149 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1150 u32 bw_flags = 0;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001151 const struct ieee80211_reg_rule *reg_rule = NULL;
1152 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001153 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001154 struct ieee80211_supported_band *sband;
1155 struct ieee80211_channel *chan;
1156
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001157 assert_reg_lock();
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001158
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001159 sband = wiphy->bands[band];
1160 BUG_ON(chan_idx >= sband->n_channels);
1161 chan = &sband->channels[chan_idx];
1162
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001163 r = freq_reg_info_regd(wiphy,
1164 MHZ_TO_KHZ(chan->center_freq),
1165 desired_bw_khz,
1166 &reg_rule,
1167 regd);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001168
1169 if (r) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001170 REG_DBG_PRINT("Disabling freq %d MHz as custom "
Luis R. Rodrigueza6518532010-10-20 10:18:57 -07001171 "regd has no rule that fits a %d MHz "
1172 "wide channel\n",
1173 chan->center_freq,
1174 KHZ_TO_MHZ(desired_bw_khz));
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001175 chan->flags = IEEE80211_CHAN_DISABLED;
1176 return;
1177 }
1178
Luis R. Rodrigueze702d3c2010-10-21 19:17:04 +05301179 chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
1180
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001181 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001182 freq_range = &reg_rule->freq_range;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001183
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001184 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1185 bw_flags = IEEE80211_CHAN_NO_HT40;
1186
1187 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001188 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001189 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1190}
1191
1192static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1193 const struct ieee80211_regdomain *regd)
1194{
1195 unsigned int i;
1196 struct ieee80211_supported_band *sband;
1197
1198 BUG_ON(!wiphy->bands[band]);
1199 sband = wiphy->bands[band];
1200
1201 for (i = 0; i < sband->n_channels; i++)
1202 handle_channel_custom(wiphy, band, i, regd);
1203}
1204
1205/* Used by drivers prior to wiphy registration */
1206void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1207 const struct ieee80211_regdomain *regd)
1208{
1209 enum ieee80211_band band;
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001210 unsigned int bands_set = 0;
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001211
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001212 mutex_lock(&reg_mutex);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001213 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001214 if (!wiphy->bands[band])
1215 continue;
1216 handle_band_custom(wiphy, band, regd);
1217 bands_set++;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001218 }
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001219 mutex_unlock(&reg_mutex);
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001220
1221 /*
1222 * no point in calling this if it won't have any effect
1223 * on your device's supportd bands.
1224 */
1225 WARN_ON(!bands_set);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001226}
1227EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1228
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001229/*
1230 * Return value which can be used by ignore_request() to indicate
1231 * it has been determined we should intersect two regulatory domains
1232 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001233#define REG_INTERSECT 1
1234
Johannes Berg84fa4f42008-10-24 20:32:23 +02001235/* This has the logic which determines when a new request
1236 * should be ignored. */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001237static int ignore_request(struct wiphy *wiphy,
1238 struct regulatory_request *pending_request)
Johannes Berg84fa4f42008-10-24 20:32:23 +02001239{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001240 struct wiphy *last_wiphy = NULL;
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001241
1242 assert_cfg80211_lock();
1243
Johannes Berg84fa4f42008-10-24 20:32:23 +02001244 /* All initial requests are respected */
1245 if (!last_request)
1246 return 0;
1247
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001248 switch (pending_request->initiator) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001249 case NL80211_REGDOM_SET_BY_CORE:
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001250 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001251 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001252
1253 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1254
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001255 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001256 return -EINVAL;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001257 if (last_request->initiator ==
1258 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001259 if (last_wiphy != wiphy) {
Johannes Berg84fa4f42008-10-24 20:32:23 +02001260 /*
1261 * Two cards with two APs claiming different
Thadeu Lima de Souza Cascardo1fe90b02009-08-11 11:18:42 -03001262 * Country IE alpha2s. We could
Johannes Berg84fa4f42008-10-24 20:32:23 +02001263 * intersect them, but that seems unlikely
1264 * to be correct. Reject second one for now.
1265 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001266 if (regdom_changes(pending_request->alpha2))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001267 return -EOPNOTSUPP;
1268 return -EALREADY;
1269 }
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001270 /*
1271 * Two consecutive Country IE hints on the same wiphy.
1272 * This should be picked up early by the driver/stack
1273 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001274 if (WARN_ON(regdom_changes(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001275 return 0;
1276 return -EALREADY;
1277 }
Luis R. Rodrigueza171fba2010-10-18 17:44:51 -07001278 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001279 case NL80211_REGDOM_SET_BY_DRIVER:
1280 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001281 if (regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001282 return 0;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001283 return -EALREADY;
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001284 }
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001285
1286 /*
1287 * This would happen if you unplug and plug your card
1288 * back in or if you add a new device for which the previously
1289 * loaded card also agrees on the regulatory domain.
1290 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001291 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001292 !regdom_changes(pending_request->alpha2))
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001293 return -EALREADY;
1294
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001295 return REG_INTERSECT;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001296 case NL80211_REGDOM_SET_BY_USER:
1297 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001298 return REG_INTERSECT;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001299 /*
1300 * If the user knows better the user should set the regdom
1301 * to their country before the IE is picked up
1302 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001303 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001304 last_request->intersect)
1305 return -EOPNOTSUPP;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001306 /*
1307 * Process user requests only after previous user/driver/core
1308 * requests have been processed
1309 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001310 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1311 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1312 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
Luis R. Rodriguez69b15722009-02-21 00:04:33 -05001313 if (regdom_changes(last_request->alpha2))
Luis R. Rodriguez5eebade2009-01-22 15:05:47 -08001314 return -EAGAIN;
1315 }
1316
John W. Linvillebaeb66f2009-12-18 17:59:02 -05001317 if (!regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001318 return -EALREADY;
1319
Johannes Berg84fa4f42008-10-24 20:32:23 +02001320 return 0;
1321 }
1322
1323 return -EINVAL;
1324}
1325
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001326static void reg_set_request_processed(void)
1327{
1328 bool need_more_processing = false;
1329
1330 last_request->processed = true;
1331
1332 spin_lock(&reg_requests_lock);
1333 if (!list_empty(&reg_requests_list))
1334 need_more_processing = true;
1335 spin_unlock(&reg_requests_lock);
1336
1337 if (need_more_processing)
1338 schedule_work(&reg_work);
1339}
1340
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001341/**
1342 * __regulatory_hint - hint to the wireless core a regulatory domain
1343 * @wiphy: if the hint comes from country information from an AP, this
1344 * is required to be set to the wiphy that received the information
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001345 * @pending_request: the regulatory request currently being processed
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001346 *
1347 * The Wireless subsystem can use this function to hint to the wireless core
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001348 * what it believes should be the current regulatory domain.
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001349 *
1350 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1351 * already been set or other standard error codes.
1352 *
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001353 * Caller must hold &cfg80211_mutex and &reg_mutex
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001354 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001355static int __regulatory_hint(struct wiphy *wiphy,
1356 struct regulatory_request *pending_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001357{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001358 bool intersect = false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001359 int r = 0;
1360
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001361 assert_cfg80211_lock();
1362
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001363 r = ignore_request(wiphy, pending_request);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001364
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001365 if (r == REG_INTERSECT) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001366 if (pending_request->initiator ==
1367 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001368 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001369 if (r) {
1370 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001371 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001372 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001373 }
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001374 intersect = true;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001375 } else if (r) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001376 /*
1377 * If the regulatory domain being requested by the
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001378 * driver has already been set just copy it to the
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001379 * wiphy
1380 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001381 if (r == -EALREADY &&
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001382 pending_request->initiator ==
1383 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001384 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001385 if (r) {
1386 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001387 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001388 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001389 r = -EALREADY;
1390 goto new_request;
1391 }
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001392 kfree(pending_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001393 return r;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001394 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001395
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001396new_request:
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001397 kfree(last_request);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001398
1399 last_request = pending_request;
1400 last_request->intersect = intersect;
1401
1402 pending_request = NULL;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001403
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001404 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1405 user_alpha2[0] = last_request->alpha2[0];
1406 user_alpha2[1] = last_request->alpha2[1];
1407 }
1408
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001409 /* When r == REG_INTERSECT we do need to call CRDA */
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001410 if (r < 0) {
1411 /*
1412 * Since CRDA will not be called in this case as we already
1413 * have applied the requested regulatory domain before we just
1414 * inform userspace we have processed the request
1415 */
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001416 if (r == -EALREADY) {
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001417 nl80211_send_reg_change_event(last_request);
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001418 reg_set_request_processed();
1419 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001420 return r;
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001421 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001422
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001423 return call_crda(last_request->alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001424}
1425
Luis R. Rodriguez30a548c2009-05-02 01:17:27 -04001426/* This processes *all* regulatory hints */
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001427static void reg_process_hint(struct regulatory_request *reg_request)
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001428{
1429 int r = 0;
1430 struct wiphy *wiphy = NULL;
Yuri Ershovc4c32292010-06-29 15:08:08 +04001431 enum nl80211_reg_initiator initiator = reg_request->initiator;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001432
1433 BUG_ON(!reg_request->alpha2);
1434
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001435 if (wiphy_idx_valid(reg_request->wiphy_idx))
1436 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1437
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001438 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001439 !wiphy) {
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001440 kfree(reg_request);
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001441 return;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001442 }
1443
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001444 r = __regulatory_hint(wiphy, reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001445 /* This is required so that the orig_* parameters are saved */
Johannes Berg5be83de2009-11-19 00:56:28 +01001446 if (r == -EALREADY && wiphy &&
1447 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
Yuri Ershovc4c32292010-06-29 15:08:08 +04001448 wiphy_update_regulatory(wiphy, initiator);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001449}
1450
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001451/*
1452 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1453 * Regulatory hints come on a first come first serve basis and we
1454 * must process each one atomically.
1455 */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001456static void reg_process_pending_hints(void)
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001457{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001458 struct regulatory_request *reg_request;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001459
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001460 mutex_lock(&cfg80211_mutex);
1461 mutex_lock(&reg_mutex);
1462
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001463 /* When last_request->processed becomes true this will be rescheduled */
1464 if (last_request && !last_request->processed) {
1465 REG_DBG_PRINT("Pending regulatory request, waiting "
1466 "for it to be processed...");
1467 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001468 }
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001469
1470 spin_lock(&reg_requests_lock);
1471
1472 if (list_empty(&reg_requests_list)) {
1473 spin_unlock(&reg_requests_lock);
1474 goto out;
1475 }
1476
1477 reg_request = list_first_entry(&reg_requests_list,
1478 struct regulatory_request,
1479 list);
1480 list_del_init(&reg_request->list);
1481
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001482 spin_unlock(&reg_requests_lock);
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001483
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08001484 reg_process_hint(reg_request);
1485
1486out:
Luis R. Rodriguezb0e28802010-11-17 21:46:08 -08001487 mutex_unlock(&reg_mutex);
1488 mutex_unlock(&cfg80211_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001489}
1490
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001491/* Processes beacon hints -- this has nothing to do with country IEs */
1492static void reg_process_pending_beacon_hints(void)
1493{
Johannes Berg79c97e92009-07-07 03:56:12 +02001494 struct cfg80211_registered_device *rdev;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001495 struct reg_beacon *pending_beacon, *tmp;
1496
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001497 /*
1498 * No need to hold the reg_mutex here as we just touch wiphys
1499 * and do not read or access regulatory variables.
1500 */
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001501 mutex_lock(&cfg80211_mutex);
1502
1503 /* This goes through the _pending_ beacon list */
1504 spin_lock_bh(&reg_pending_beacons_lock);
1505
1506 if (list_empty(&reg_pending_beacons)) {
1507 spin_unlock_bh(&reg_pending_beacons_lock);
1508 goto out;
1509 }
1510
1511 list_for_each_entry_safe(pending_beacon, tmp,
1512 &reg_pending_beacons, list) {
1513
1514 list_del_init(&pending_beacon->list);
1515
1516 /* Applies the beacon hint to current wiphys */
Johannes Berg79c97e92009-07-07 03:56:12 +02001517 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1518 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001519
1520 /* Remembers the beacon hint for new wiphys or reg changes */
1521 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1522 }
1523
1524 spin_unlock_bh(&reg_pending_beacons_lock);
1525out:
1526 mutex_unlock(&cfg80211_mutex);
1527}
1528
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001529static void reg_todo(struct work_struct *work)
1530{
1531 reg_process_pending_hints();
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001532 reg_process_pending_beacon_hints();
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001533}
1534
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001535static void queue_regulatory_request(struct regulatory_request *request)
1536{
John W. Linvillec61029c2010-08-05 14:26:24 -04001537 if (isalpha(request->alpha2[0]))
1538 request->alpha2[0] = toupper(request->alpha2[0]);
1539 if (isalpha(request->alpha2[1]))
1540 request->alpha2[1] = toupper(request->alpha2[1]);
1541
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001542 spin_lock(&reg_requests_lock);
1543 list_add_tail(&request->list, &reg_requests_list);
1544 spin_unlock(&reg_requests_lock);
1545
1546 schedule_work(&reg_work);
1547}
1548
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001549/*
1550 * Core regulatory hint -- happens during cfg80211_init()
1551 * and when we restore regulatory settings.
1552 */
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001553static int regulatory_hint_core(const char *alpha2)
1554{
1555 struct regulatory_request *request;
1556
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001557 kfree(last_request);
1558 last_request = NULL;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001559
1560 request = kzalloc(sizeof(struct regulatory_request),
1561 GFP_KERNEL);
1562 if (!request)
1563 return -ENOMEM;
1564
1565 request->alpha2[0] = alpha2[0];
1566 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001567 request->initiator = NL80211_REGDOM_SET_BY_CORE;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001568
Luis R. Rodriguez31e99722010-11-17 21:46:06 -08001569 queue_regulatory_request(request);
Luis R. Rodriguez5078b2e2009-05-13 17:04:42 -04001570
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001571 return 0;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001572}
1573
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001574/* User hints */
1575int regulatory_hint_user(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001576{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001577 struct regulatory_request *request;
1578
Johannes Bergbe3d4812008-10-24 20:32:21 +02001579 BUG_ON(!alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001580
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001581 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1582 if (!request)
1583 return -ENOMEM;
1584
1585 request->wiphy_idx = WIPHY_IDX_STALE;
1586 request->alpha2[0] = alpha2[0];
1587 request->alpha2[1] = alpha2[1];
Luis R. Rodrigueze12822e2010-01-04 11:37:39 -05001588 request->initiator = NL80211_REGDOM_SET_BY_USER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001589
1590 queue_regulatory_request(request);
1591
1592 return 0;
1593}
1594
1595/* Driver hints */
1596int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1597{
1598 struct regulatory_request *request;
1599
1600 BUG_ON(!alpha2);
1601 BUG_ON(!wiphy);
1602
1603 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1604 if (!request)
1605 return -ENOMEM;
1606
1607 request->wiphy_idx = get_wiphy_idx(wiphy);
1608
1609 /* Must have registered wiphy first */
1610 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1611
1612 request->alpha2[0] = alpha2[0];
1613 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001614 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001615
1616 queue_regulatory_request(request);
1617
1618 return 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001619}
1620EXPORT_SYMBOL(regulatory_hint);
1621
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001622/*
1623 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1624 * therefore cannot iterate over the rdev list here.
1625 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001626void regulatory_hint_11d(struct wiphy *wiphy,
Luis R. Rodriguez84920e32010-01-14 20:08:20 -05001627 enum ieee80211_band band,
1628 u8 *country_ie,
1629 u8 country_ie_len)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001630{
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001631 char alpha2[2];
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001632 enum environment_cap env = ENVIRON_ANY;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001633 struct regulatory_request *request;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001634
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001635 mutex_lock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001636
Luis R. Rodriguez9828b012009-07-30 17:38:06 -07001637 if (unlikely(!last_request))
1638 goto out;
Luis R. Rodriguezd335fe62009-02-21 00:04:27 -05001639
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001640 /* IE len must be evenly divisible by 2 */
1641 if (country_ie_len & 0x01)
1642 goto out;
1643
1644 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1645 goto out;
1646
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001647 alpha2[0] = country_ie[0];
1648 alpha2[1] = country_ie[1];
1649
1650 if (country_ie[2] == 'I')
1651 env = ENVIRON_INDOOR;
1652 else if (country_ie[2] == 'O')
1653 env = ENVIRON_OUTDOOR;
1654
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001655 /*
Luis R. Rodriguez8b19e6c2009-07-30 17:38:09 -07001656 * We will run this only upon a successful connection on cfg80211.
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001657 * We leave conflict resolution to the workqueue, where can hold
1658 * cfg80211_mutex.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001659 */
Luis R. Rodriguezcc0b6fe2009-03-20 23:53:05 -04001660 if (likely(last_request->initiator ==
1661 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001662 wiphy_idx_valid(last_request->wiphy_idx)))
1663 goto out;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001664
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001665 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1666 if (!request)
Dan Carpenterf9f9b6e2010-07-22 13:26:50 +02001667 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001668
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001669 request->wiphy_idx = get_wiphy_idx(wiphy);
John W. Linville4f366c52010-07-15 14:57:33 -04001670 request->alpha2[0] = alpha2[0];
1671 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001672 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001673 request->country_ie_env = env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001674
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001675 mutex_unlock(&reg_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001676
1677 queue_regulatory_request(request);
1678
1679 return;
Luis R. Rodriguez0441d6f2009-02-21 00:04:29 -05001680
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001681out:
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001682 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001683}
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001684
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001685static void restore_alpha2(char *alpha2, bool reset_user)
1686{
1687 /* indicates there is no alpha2 to consider for restoration */
1688 alpha2[0] = '9';
1689 alpha2[1] = '7';
1690
1691 /* The user setting has precedence over the module parameter */
1692 if (is_user_regdom_saved()) {
1693 /* Unless we're asked to ignore it and reset it */
1694 if (reset_user) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001695 REG_DBG_PRINT("Restoring regulatory settings "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001696 "including user preference\n");
1697 user_alpha2[0] = '9';
1698 user_alpha2[1] = '7';
1699
1700 /*
1701 * If we're ignoring user settings, we still need to
1702 * check the module parameter to ensure we put things
1703 * back as they were for a full restore.
1704 */
1705 if (!is_world_regdom(ieee80211_regdom)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001706 REG_DBG_PRINT("Keeping preference on "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001707 "module parameter ieee80211_regdom: %c%c\n",
1708 ieee80211_regdom[0],
1709 ieee80211_regdom[1]);
1710 alpha2[0] = ieee80211_regdom[0];
1711 alpha2[1] = ieee80211_regdom[1];
1712 }
1713 } else {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001714 REG_DBG_PRINT("Restoring regulatory settings "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001715 "while preserving user preference for: %c%c\n",
1716 user_alpha2[0],
1717 user_alpha2[1]);
1718 alpha2[0] = user_alpha2[0];
1719 alpha2[1] = user_alpha2[1];
1720 }
1721 } else if (!is_world_regdom(ieee80211_regdom)) {
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001722 REG_DBG_PRINT("Keeping preference on "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001723 "module parameter ieee80211_regdom: %c%c\n",
1724 ieee80211_regdom[0],
1725 ieee80211_regdom[1]);
1726 alpha2[0] = ieee80211_regdom[0];
1727 alpha2[1] = ieee80211_regdom[1];
1728 } else
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001729 REG_DBG_PRINT("Restoring regulatory settings\n");
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001730}
1731
1732/*
1733 * Restoring regulatory settings involves ingoring any
1734 * possibly stale country IE information and user regulatory
1735 * settings if so desired, this includes any beacon hints
1736 * learned as we could have traveled outside to another country
1737 * after disconnection. To restore regulatory settings we do
1738 * exactly what we did at bootup:
1739 *
1740 * - send a core regulatory hint
1741 * - send a user regulatory hint if applicable
1742 *
1743 * Device drivers that send a regulatory hint for a specific country
1744 * keep their own regulatory domain on wiphy->regd so that does does
1745 * not need to be remembered.
1746 */
1747static void restore_regulatory_settings(bool reset_user)
1748{
1749 char alpha2[2];
1750 struct reg_beacon *reg_beacon, *btmp;
1751
1752 mutex_lock(&cfg80211_mutex);
1753 mutex_lock(&reg_mutex);
1754
1755 reset_regdomains();
1756 restore_alpha2(alpha2, reset_user);
1757
1758 /* Clear beacon hints */
1759 spin_lock_bh(&reg_pending_beacons_lock);
1760 if (!list_empty(&reg_pending_beacons)) {
1761 list_for_each_entry_safe(reg_beacon, btmp,
1762 &reg_pending_beacons, list) {
1763 list_del(&reg_beacon->list);
1764 kfree(reg_beacon);
1765 }
1766 }
1767 spin_unlock_bh(&reg_pending_beacons_lock);
1768
1769 if (!list_empty(&reg_beacon_list)) {
1770 list_for_each_entry_safe(reg_beacon, btmp,
1771 &reg_beacon_list, list) {
1772 list_del(&reg_beacon->list);
1773 kfree(reg_beacon);
1774 }
1775 }
1776
1777 /* First restore to the basic regulatory settings */
1778 cfg80211_regdomain = cfg80211_world_regdom;
1779
1780 mutex_unlock(&reg_mutex);
1781 mutex_unlock(&cfg80211_mutex);
1782
1783 regulatory_hint_core(cfg80211_regdomain->alpha2);
1784
1785 /*
1786 * This restores the ieee80211_regdom module parameter
1787 * preference or the last user requested regulatory
1788 * settings, user regulatory settings takes precedence.
1789 */
1790 if (is_an_alpha2(alpha2))
1791 regulatory_hint_user(user_alpha2);
1792}
1793
1794
1795void regulatory_hint_disconnect(void)
1796{
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001797 REG_DBG_PRINT("All devices are disconnected, going to "
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001798 "restore regulatory settings\n");
1799 restore_regulatory_settings(false);
1800}
1801
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001802static bool freq_is_chan_12_13_14(u16 freq)
1803{
1804 if (freq == ieee80211_channel_to_frequency(12) ||
1805 freq == ieee80211_channel_to_frequency(13) ||
1806 freq == ieee80211_channel_to_frequency(14))
1807 return true;
1808 return false;
1809}
1810
1811int regulatory_hint_found_beacon(struct wiphy *wiphy,
1812 struct ieee80211_channel *beacon_chan,
1813 gfp_t gfp)
1814{
1815 struct reg_beacon *reg_beacon;
1816
1817 if (likely((beacon_chan->beacon_found ||
1818 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1819 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1820 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1821 return 0;
1822
1823 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1824 if (!reg_beacon)
1825 return -ENOMEM;
1826
Luis R. Rodriguezd91e41b2010-10-20 10:18:59 -07001827 REG_DBG_PRINT("Found new beacon on "
Luis R. Rodriguez4113f752010-01-04 11:50:11 -05001828 "frequency: %d MHz (Ch %d) on %s\n",
1829 beacon_chan->center_freq,
1830 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1831 wiphy_name(wiphy));
1832
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001833 memcpy(&reg_beacon->chan, beacon_chan,
1834 sizeof(struct ieee80211_channel));
1835
1836
1837 /*
1838 * Since we can be called from BH or and non-BH context
1839 * we must use spin_lock_bh()
1840 */
1841 spin_lock_bh(&reg_pending_beacons_lock);
1842 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1843 spin_unlock_bh(&reg_pending_beacons_lock);
1844
1845 schedule_work(&reg_work);
1846
1847 return 0;
1848}
1849
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001850static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001851{
1852 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001853 const struct ieee80211_reg_rule *reg_rule = NULL;
1854 const struct ieee80211_freq_range *freq_range = NULL;
1855 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001856
Joe Perchese9c02682010-11-16 19:56:49 -08001857 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001858
1859 for (i = 0; i < rd->n_reg_rules; i++) {
1860 reg_rule = &rd->reg_rules[i];
1861 freq_range = &reg_rule->freq_range;
1862 power_rule = &reg_rule->power_rule;
1863
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001864 /*
1865 * There may not be documentation for max antenna gain
1866 * in certain regions
1867 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001868 if (power_rule->max_antenna_gain)
Joe Perchese9c02682010-11-16 19:56:49 -08001869 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001870 freq_range->start_freq_khz,
1871 freq_range->end_freq_khz,
1872 freq_range->max_bandwidth_khz,
1873 power_rule->max_antenna_gain,
1874 power_rule->max_eirp);
1875 else
Joe Perchese9c02682010-11-16 19:56:49 -08001876 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001877 freq_range->start_freq_khz,
1878 freq_range->end_freq_khz,
1879 freq_range->max_bandwidth_khz,
1880 power_rule->max_eirp);
1881 }
1882}
1883
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001884static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001885{
1886
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001887 if (is_intersected_alpha2(rd->alpha2)) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001888
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001889 if (last_request->initiator ==
1890 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Johannes Berg79c97e92009-07-07 03:56:12 +02001891 struct cfg80211_registered_device *rdev;
1892 rdev = cfg80211_rdev_by_wiphy_idx(
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001893 last_request->wiphy_idx);
Johannes Berg79c97e92009-07-07 03:56:12 +02001894 if (rdev) {
Joe Perchese9c02682010-11-16 19:56:49 -08001895 pr_info("Current regulatory domain updated by AP to: %c%c\n",
Johannes Berg79c97e92009-07-07 03:56:12 +02001896 rdev->country_ie_alpha2[0],
1897 rdev->country_ie_alpha2[1]);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001898 } else
Joe Perchese9c02682010-11-16 19:56:49 -08001899 pr_info("Current regulatory domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001900 } else
Joe Perchese9c02682010-11-16 19:56:49 -08001901 pr_info("Current regulatory domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001902 } else if (is_world_regdom(rd->alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -08001903 pr_info("World regulatory domain updated:\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001904 else {
1905 if (is_unknown_alpha2(rd->alpha2))
Joe Perchese9c02682010-11-16 19:56:49 -08001906 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001907 else
Joe Perchese9c02682010-11-16 19:56:49 -08001908 pr_info("Regulatory domain changed to country: %c%c\n",
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001909 rd->alpha2[0], rd->alpha2[1]);
1910 }
1911 print_rd_rules(rd);
1912}
1913
Johannes Berg2df78162008-10-28 16:49:41 +01001914static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001915{
Joe Perchese9c02682010-11-16 19:56:49 -08001916 pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001917 print_rd_rules(rd);
1918}
1919
Johannes Bergd2372b32008-10-24 20:32:20 +02001920/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001921static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001922{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001923 const struct ieee80211_regdomain *intersected_rd = NULL;
Johannes Berg79c97e92009-07-07 03:56:12 +02001924 struct cfg80211_registered_device *rdev = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001925 struct wiphy *request_wiphy;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001926 /* Some basic sanity checks first */
1927
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001928 if (is_world_regdom(rd->alpha2)) {
Johannes Bergf6037d02008-10-21 11:01:33 +02001929 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001930 return -EINVAL;
1931 update_world_regdomain(rd);
1932 return 0;
1933 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001934
1935 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1936 !is_unknown_alpha2(rd->alpha2))
1937 return -EINVAL;
1938
Johannes Bergf6037d02008-10-21 11:01:33 +02001939 if (!last_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001940 return -EINVAL;
1941
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001942 /*
1943 * Lets only bother proceeding on the same alpha2 if the current
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001944 * rd is non static (it means CRDA was present and was used last)
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001945 * and the pending request came in from a country IE
1946 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001947 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001948 /*
1949 * If someone else asked us to change the rd lets only bother
1950 * checking if the alpha2 changes if CRDA was already called
1951 */
John W. Linvillebaeb66f2009-12-18 17:59:02 -05001952 if (!regdom_changes(rd->alpha2))
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001953 return -EINVAL;
1954 }
1955
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001956 /*
1957 * Now lets set the regulatory domain, update all driver channels
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001958 * and finally inform them of what we have done, in case they want
1959 * to review or adjust their own settings based on their own
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001960 * internal EEPROM data
1961 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001962
Johannes Bergf6037d02008-10-21 11:01:33 +02001963 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001964 return -EINVAL;
1965
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08001966 if (!is_valid_rd(rd)) {
Joe Perchese9c02682010-11-16 19:56:49 -08001967 pr_err("Invalid regulatory domain detected:\n");
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08001968 print_regdomain_info(rd);
1969 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001970 }
1971
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001972 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1973
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001974 if (!last_request->intersect) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001975 int r;
1976
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001977 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001978 reset_regdomains();
1979 cfg80211_regdomain = rd;
1980 return 0;
1981 }
1982
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001983 /*
1984 * For a driver hint, lets copy the regulatory domain the
1985 * driver wanted to the wiphy to deal with conflicts
1986 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001987
Luis R. Rodriguez558f6d32009-06-08 18:54:37 -07001988 /*
1989 * Userspace could have sent two replies with only
1990 * one kernel request.
1991 */
1992 if (request_wiphy->regd)
1993 return -EALREADY;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001994
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001995 r = reg_copy_regd(&request_wiphy->regd, rd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001996 if (r)
1997 return r;
1998
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001999 reset_regdomains();
2000 cfg80211_regdomain = rd;
2001 return 0;
2002 }
2003
2004 /* Intersection requires a bit more work */
2005
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002006 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002007
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002008 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
2009 if (!intersected_rd)
2010 return -EINVAL;
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002011
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002012 /*
2013 * We can trash what CRDA provided now.
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002014 * However if a driver requested this specific regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002015 * domain we keep it for its private use
2016 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04002017 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002018 request_wiphy->regd = rd;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08002019 else
2020 kfree(rd);
2021
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002022 rd = NULL;
2023
2024 reset_regdomains();
2025 cfg80211_regdomain = intersected_rd;
2026
2027 return 0;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07002028 }
2029
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002030 if (!intersected_rd)
2031 return -EINVAL;
2032
Johannes Berg79c97e92009-07-07 03:56:12 +02002033 rdev = wiphy_to_dev(request_wiphy);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002034
Johannes Berg79c97e92009-07-07 03:56:12 +02002035 rdev->country_ie_alpha2[0] = rd->alpha2[0];
2036 rdev->country_ie_alpha2[1] = rd->alpha2[1];
2037 rdev->env = last_request->country_ie_env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002038
2039 BUG_ON(intersected_rd == rd);
2040
2041 kfree(rd);
2042 rd = NULL;
2043
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08002044 reset_regdomains();
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002045 cfg80211_regdomain = intersected_rd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002046
2047 return 0;
2048}
2049
2050
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002051/*
2052 * Use this call to set the current regulatory domain. Conflicts with
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002053 * multiple drivers can be ironed out later. Caller must've already
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05002054 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2055 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002056int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002057{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002058 int r;
2059
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05002060 assert_cfg80211_lock();
2061
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002062 mutex_lock(&reg_mutex);
2063
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002064 /* Note that this doesn't update the wiphys, this is done below */
2065 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +02002066 if (r) {
2067 kfree(rd);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002068 mutex_unlock(&reg_mutex);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002069 return r;
Johannes Bergd2372b32008-10-24 20:32:20 +02002070 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002071
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002072 /* This would make this whole thing pointless */
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08002073 if (!last_request->intersect)
2074 BUG_ON(rd != cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002075
2076 /* update all wiphys now with the new established regulatory domain */
Johannes Bergf6037d02008-10-21 11:01:33 +02002077 update_all_wiphy_regulatory(last_request->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002078
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08002079 print_regdomain(cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002080
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04002081 nl80211_send_reg_change_event(last_request);
2082
Luis R. Rodriguezb2e253c2010-11-17 21:46:09 -08002083 reg_set_request_processed();
2084
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002085 mutex_unlock(&reg_mutex);
2086
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002087 return r;
2088}
2089
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002090/* Caller must hold cfg80211_mutex */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002091void reg_device_remove(struct wiphy *wiphy)
2092{
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04002093 struct wiphy *request_wiphy = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002094
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05002095 assert_cfg80211_lock();
2096
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002097 mutex_lock(&reg_mutex);
2098
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002099 kfree(wiphy->regd);
2100
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04002101 if (last_request)
2102 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002103
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002104 if (!request_wiphy || request_wiphy != wiphy)
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002105 goto out;
Chris Wright0ef9ccd2009-04-24 14:09:31 -07002106
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05002107 last_request->wiphy_idx = WIPHY_IDX_STALE;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002108 last_request->country_ie_env = ENVIRON_ANY;
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002109out:
2110 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08002111}
2112
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002113int __init regulatory_init(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002114{
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002115 int err = 0;
Johannes Berg734366d2008-09-15 10:56:48 +02002116
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002117 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
2118 if (IS_ERR(reg_pdev))
2119 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002120
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002121 spin_lock_init(&reg_requests_lock);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002122 spin_lock_init(&reg_pending_beacons_lock);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002123
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002124 cfg80211_regdomain = cfg80211_world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +02002125
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05002126 user_alpha2[0] = '9';
2127 user_alpha2[1] = '7';
2128
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002129 /* We always try to get an update for the static regdomain */
2130 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002131 if (err) {
2132 if (err == -ENOMEM)
2133 return err;
2134 /*
2135 * N.B. kobject_uevent_env() can fail mainly for when we're out
2136 * memory which is handled and propagated appropriately above
2137 * but it can also fail during a netlink_broadcast() or during
2138 * early boot for call_usermodehelper(). For now treat these
2139 * errors as non-fatal.
2140 */
Joe Perchese9c02682010-11-16 19:56:49 -08002141 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002142#ifdef CONFIG_CFG80211_REG_DEBUG
2143 /* We want to find out exactly why when debugging */
2144 WARN_ON(err);
2145#endif
2146 }
Johannes Berg734366d2008-09-15 10:56:48 +02002147
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002148 /*
2149 * Finally, if the user set the module parameter treat it
2150 * as a user hint.
2151 */
2152 if (!is_world_regdom(ieee80211_regdom))
2153 regulatory_hint_user(ieee80211_regdom);
2154
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002155 return 0;
2156}
2157
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002158void /* __init_or_exit */ regulatory_exit(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002159{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002160 struct regulatory_request *reg_request, *tmp;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002161 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002162
2163 cancel_work_sync(&reg_work);
2164
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002165 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002166 mutex_lock(&reg_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +02002167
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002168 reset_regdomains();
Johannes Berg734366d2008-09-15 10:56:48 +02002169
Johannes Bergf6037d02008-10-21 11:01:33 +02002170 kfree(last_request);
2171
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002172 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002173
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002174 spin_lock_bh(&reg_pending_beacons_lock);
2175 if (!list_empty(&reg_pending_beacons)) {
2176 list_for_each_entry_safe(reg_beacon, btmp,
2177 &reg_pending_beacons, list) {
2178 list_del(&reg_beacon->list);
2179 kfree(reg_beacon);
2180 }
2181 }
2182 spin_unlock_bh(&reg_pending_beacons_lock);
2183
2184 if (!list_empty(&reg_beacon_list)) {
2185 list_for_each_entry_safe(reg_beacon, btmp,
2186 &reg_beacon_list, list) {
2187 list_del(&reg_beacon->list);
2188 kfree(reg_beacon);
2189 }
2190 }
2191
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002192 spin_lock(&reg_requests_lock);
2193 if (!list_empty(&reg_requests_list)) {
2194 list_for_each_entry_safe(reg_request, tmp,
2195 &reg_requests_list, list) {
2196 list_del(&reg_request->list);
2197 kfree(reg_request);
2198 }
2199 }
2200 spin_unlock(&reg_requests_lock);
2201
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002202 mutex_unlock(&reg_mutex);
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002203 mutex_unlock(&cfg80211_mutex);
Johannes Berg8318d782008-01-24 19:38:38 +01002204}