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Johannes Berg8318d782008-01-24 19:38:38 +01001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07005 * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com>
Johannes Berg8318d782008-01-24 19:38:38 +01006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070012/**
13 * DOC: Wireless regulatory infrastructure
Johannes Berg8318d782008-01-24 19:38:38 +010014 *
15 * The usual implementation is for a driver to read a device EEPROM to
16 * determine which regulatory domain it should be operating under, then
17 * looking up the allowable channels in a driver-local table and finally
18 * registering those channels in the wiphy structure.
19 *
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070020 * Another set of compliance enforcement is for drivers to use their
21 * own compliance limits which can be stored on the EEPROM. The host
22 * driver or firmware may ensure these are used.
23 *
24 * In addition to all this we provide an extra layer of regulatory
25 * conformance. For drivers which do not have any regulatory
26 * information CRDA provides the complete regulatory solution.
27 * For others it provides a community effort on further restrictions
28 * to enhance compliance.
29 *
30 * Note: When number of rules --> infinity we will not be able to
31 * index on alpha2 any more, instead we'll probably have to
32 * rely on some SHA1 checksum of the regdomain for example.
33 *
Johannes Berg8318d782008-01-24 19:38:38 +010034 */
35#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070037#include <linux/list.h>
38#include <linux/random.h>
John W. Linvillec61029c2010-08-05 14:26:24 -040039#include <linux/ctype.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070040#include <linux/nl80211.h>
41#include <linux/platform_device.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070042#include <net/cfg80211.h>
Johannes Berg8318d782008-01-24 19:38:38 +010043#include "core.h"
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070044#include "reg.h"
John W. Linville3b377ea2009-12-18 17:59:01 -050045#include "regdb.h"
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -040046#include "nl80211.h"
Johannes Berg8318d782008-01-24 19:38:38 +010047
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050048#ifdef CONFIG_CFG80211_REG_DEBUG
John W. Linville82711952010-01-05 17:57:20 -050049#define REG_DBG_PRINT(format, args...) \
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050050 do { \
John W. Linville82711952010-01-05 17:57:20 -050051 printk(KERN_DEBUG format , ## args); \
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050052 } while (0)
53#else
John W. Linville82711952010-01-05 17:57:20 -050054#define REG_DBG_PRINT(args...)
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050055#endif
56
Luis R. Rodriguez5166ccd2008-10-30 13:33:56 -070057/* Receipt of information from last regulatory request */
Johannes Bergf6037d02008-10-21 11:01:33 +020058static struct regulatory_request *last_request;
Johannes Berg734366d2008-09-15 10:56:48 +020059
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070060/* To trigger userspace events */
61static struct platform_device *reg_pdev;
Johannes Berg8318d782008-01-24 19:38:38 +010062
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050063/*
64 * Central wireless core regulatory domains, we only need two,
Johannes Berg734366d2008-09-15 10:56:48 +020065 * the current one and a world regulatory domain in case we have no
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050066 * information to give us an alpha2
67 */
Luis R. Rodriguezf1303472009-01-30 09:26:42 -080068const struct ieee80211_regdomain *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +020069
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050070/*
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070071 * Protects static reg.c components:
72 * - cfg80211_world_regdom
73 * - cfg80211_regdom
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070074 * - last_request
75 */
John W. Linville670b7f12010-06-24 11:26:31 -040076static DEFINE_MUTEX(reg_mutex);
Johannes Berg46a5eba2010-09-15 13:28:15 +020077
78static inline void assert_reg_lock(void)
79{
80 lockdep_assert_held(&reg_mutex);
81}
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070082
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -050083/* Used to queue up regulatory hints */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -050084static LIST_HEAD(reg_requests_list);
85static spinlock_t reg_requests_lock;
86
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -050087/* Used to queue up beacon hints for review */
88static LIST_HEAD(reg_pending_beacons);
89static spinlock_t reg_pending_beacons_lock;
90
91/* Used to keep track of processed beacon hints */
92static LIST_HEAD(reg_beacon_list);
93
94struct reg_beacon {
95 struct list_head list;
96 struct ieee80211_channel chan;
97};
98
Johannes Berg734366d2008-09-15 10:56:48 +020099/* We keep a static world regulatory domain in case of the absence of CRDA */
100static const struct ieee80211_regdomain world_regdom = {
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800101 .n_reg_rules = 5,
Johannes Berg734366d2008-09-15 10:56:48 +0200102 .alpha2 = "00",
103 .reg_rules = {
Luis R. Rodriguez68798a62009-02-21 00:20:37 -0500104 /* IEEE 802.11b/g, channels 1..11 */
105 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800106 /* IEEE 802.11b/g, channels 12..13. No HT40
107 * channel fits here. */
108 REG_RULE(2467-10, 2472+10, 20, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500109 NL80211_RRF_PASSIVE_SCAN |
110 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800111 /* IEEE 802.11 channel 14 - Only JP enables
112 * this and for 802.11b only */
113 REG_RULE(2484-10, 2484+10, 20, 6, 20,
114 NL80211_RRF_PASSIVE_SCAN |
115 NL80211_RRF_NO_IBSS |
116 NL80211_RRF_NO_OFDM),
117 /* IEEE 802.11a, channel 36..48 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800118 REG_RULE(5180-10, 5240+10, 40, 6, 20,
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800119 NL80211_RRF_PASSIVE_SCAN |
120 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500121
122 /* NB: 5260 MHz - 5700 MHz requies DFS */
123
124 /* IEEE 802.11a, channel 149..165 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800125 REG_RULE(5745-10, 5825+10, 40, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500126 NL80211_RRF_PASSIVE_SCAN |
127 NL80211_RRF_NO_IBSS),
Johannes Berg734366d2008-09-15 10:56:48 +0200128 }
129};
130
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200131static const struct ieee80211_regdomain *cfg80211_world_regdom =
132 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200133
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400134static char *ieee80211_regdom = "00";
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500135static char user_alpha2[2];
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400136
Johannes Berg734366d2008-09-15 10:56:48 +0200137module_param(ieee80211_regdom, charp, 0444);
138MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
139
Johannes Berg734366d2008-09-15 10:56:48 +0200140static void reset_regdomains(void)
141{
Johannes Berg942b25c2008-09-15 11:26:47 +0200142 /* avoid freeing static information or freeing something twice */
143 if (cfg80211_regdomain == cfg80211_world_regdom)
144 cfg80211_regdomain = NULL;
145 if (cfg80211_world_regdom == &world_regdom)
146 cfg80211_world_regdom = NULL;
147 if (cfg80211_regdomain == &world_regdom)
148 cfg80211_regdomain = NULL;
Johannes Berg942b25c2008-09-15 11:26:47 +0200149
150 kfree(cfg80211_regdomain);
151 kfree(cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200152
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200153 cfg80211_world_regdom = &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200154 cfg80211_regdomain = NULL;
155}
156
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500157/*
158 * Dynamic world regulatory domain requested by the wireless
159 * core upon initialization
160 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200161static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200162{
Johannes Bergf6037d02008-10-21 11:01:33 +0200163 BUG_ON(!last_request);
Johannes Berg734366d2008-09-15 10:56:48 +0200164
165 reset_regdomains();
166
167 cfg80211_world_regdom = rd;
168 cfg80211_regdomain = rd;
169}
Johannes Berg734366d2008-09-15 10:56:48 +0200170
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200171bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100172{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700173 if (!alpha2)
174 return false;
175 if (alpha2[0] == '0' && alpha2[1] == '0')
176 return true;
177 return false;
Johannes Berg8318d782008-01-24 19:38:38 +0100178}
179
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200180static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700181{
182 if (!alpha2)
183 return false;
184 if (alpha2[0] != 0 && alpha2[1] != 0)
185 return true;
186 return false;
187}
Johannes Berg8318d782008-01-24 19:38:38 +0100188
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200189static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700190{
191 if (!alpha2)
192 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500193 /*
194 * Special case where regulatory domain was built by driver
195 * but a specific alpha2 cannot be determined
196 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700197 if (alpha2[0] == '9' && alpha2[1] == '9')
198 return true;
199 return false;
200}
201
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800202static bool is_intersected_alpha2(const char *alpha2)
203{
204 if (!alpha2)
205 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500206 /*
207 * Special case where regulatory domain is the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800208 * result of an intersection between two regulatory domain
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500209 * structures
210 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800211 if (alpha2[0] == '9' && alpha2[1] == '8')
212 return true;
213 return false;
214}
215
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200216static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700217{
218 if (!alpha2)
219 return false;
John W. Linvillec61029c2010-08-05 14:26:24 -0400220 if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700221 return true;
222 return false;
223}
224
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200225static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700226{
227 if (!alpha2_x || !alpha2_y)
228 return false;
229 if (alpha2_x[0] == alpha2_y[0] &&
230 alpha2_x[1] == alpha2_y[1])
231 return true;
232 return false;
233}
234
Luis R. Rodriguez69b15722009-02-21 00:04:33 -0500235static bool regdom_changes(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700236{
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500237 assert_cfg80211_lock();
238
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700239 if (!cfg80211_regdomain)
240 return true;
241 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
242 return false;
243 return true;
244}
245
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500246/*
247 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
248 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
249 * has ever been issued.
250 */
251static bool is_user_regdom_saved(void)
252{
253 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
254 return false;
255
256 /* This would indicate a mistake on the design */
257 if (WARN((!is_world_regdom(user_alpha2) &&
258 !is_an_alpha2(user_alpha2)),
259 "Unexpected user alpha2: %c%c\n",
260 user_alpha2[0],
261 user_alpha2[1]))
262 return false;
263
264 return true;
265}
266
John W. Linville3b377ea2009-12-18 17:59:01 -0500267static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
268 const struct ieee80211_regdomain *src_regd)
269{
270 struct ieee80211_regdomain *regd;
271 int size_of_regd = 0;
272 unsigned int i;
273
274 size_of_regd = sizeof(struct ieee80211_regdomain) +
275 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
276
277 regd = kzalloc(size_of_regd, GFP_KERNEL);
278 if (!regd)
279 return -ENOMEM;
280
281 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
282
283 for (i = 0; i < src_regd->n_reg_rules; i++)
284 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
285 sizeof(struct ieee80211_reg_rule));
286
287 *dst_regd = regd;
288 return 0;
289}
290
291#ifdef CONFIG_CFG80211_INTERNAL_REGDB
292struct reg_regdb_search_request {
293 char alpha2[2];
294 struct list_head list;
295};
296
297static LIST_HEAD(reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400298static DEFINE_MUTEX(reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500299
300static void reg_regdb_search(struct work_struct *work)
301{
302 struct reg_regdb_search_request *request;
303 const struct ieee80211_regdomain *curdom, *regdom;
304 int i, r;
305
John W. Linville368d06f2010-03-16 15:40:59 -0400306 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500307 while (!list_empty(&reg_regdb_search_list)) {
308 request = list_first_entry(&reg_regdb_search_list,
309 struct reg_regdb_search_request,
310 list);
311 list_del(&request->list);
312
313 for (i=0; i<reg_regdb_size; i++) {
314 curdom = reg_regdb[i];
315
316 if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
317 r = reg_copy_regd(&regdom, curdom);
318 if (r)
319 break;
John W. Linville3b377ea2009-12-18 17:59:01 -0500320 mutex_lock(&cfg80211_mutex);
321 set_regdom(regdom);
322 mutex_unlock(&cfg80211_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500323 break;
324 }
325 }
326
327 kfree(request);
328 }
John W. Linville368d06f2010-03-16 15:40:59 -0400329 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500330}
331
332static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
333
334static void reg_regdb_query(const char *alpha2)
335{
336 struct reg_regdb_search_request *request;
337
338 if (!alpha2)
339 return;
340
341 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
342 if (!request)
343 return;
344
345 memcpy(request->alpha2, alpha2, 2);
346
John W. Linville368d06f2010-03-16 15:40:59 -0400347 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500348 list_add_tail(&request->list, &reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400349 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500350
351 schedule_work(&reg_regdb_work);
352}
353#else
354static inline void reg_regdb_query(const char *alpha2) {}
355#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
356
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500357/*
358 * This lets us keep regulatory code which is updated on a regulatory
359 * basis in userspace.
360 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700361static int call_crda(const char *alpha2)
362{
363 char country_env[9 + 2] = "COUNTRY=";
364 char *envp[] = {
365 country_env,
366 NULL
367 };
368
369 if (!is_world_regdom((char *) alpha2))
370 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
371 alpha2[0], alpha2[1]);
372 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700373 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
374 "regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700375
John W. Linville3b377ea2009-12-18 17:59:01 -0500376 /* query internal regulatory database (if it exists) */
377 reg_regdb_query(alpha2);
378
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700379 country_env[8] = alpha2[0];
380 country_env[9] = alpha2[1];
381
382 return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
383}
384
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700385/* Used by nl80211 before kmalloc'ing our regulatory domain */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200386bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700387{
Luis R. Rodriguez61405e92009-05-13 17:04:41 -0400388 assert_cfg80211_lock();
389
Johannes Bergf6037d02008-10-21 11:01:33 +0200390 if (!last_request)
391 return false;
392
393 return alpha2_equal(last_request->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700394}
395
396/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200397static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700398{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200399 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700400 u32 freq_diff;
401
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800402 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700403 return false;
404
405 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
406 return false;
407
408 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
409
Roel Kluinbd05f282009-03-03 22:55:21 +0100410 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
411 freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700412 return false;
413
414 return true;
415}
416
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200417static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700418{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200419 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700420 unsigned int i;
421
422 if (!rd->n_reg_rules)
423 return false;
424
Luis R. Rodriguez88dc1c32008-11-12 14:22:01 -0800425 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
426 return false;
427
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700428 for (i = 0; i < rd->n_reg_rules; i++) {
429 reg_rule = &rd->reg_rules[i];
430 if (!is_valid_reg_rule(reg_rule))
431 return false;
432 }
433
434 return true;
435}
436
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400437static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
438 u32 center_freq_khz,
439 u32 bw_khz)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700440{
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400441 u32 start_freq_khz, end_freq_khz;
442
443 start_freq_khz = center_freq_khz - (bw_khz/2);
444 end_freq_khz = center_freq_khz + (bw_khz/2);
445
446 if (start_freq_khz >= freq_range->start_freq_khz &&
447 end_freq_khz <= freq_range->end_freq_khz)
448 return true;
449
450 return false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700451}
452
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800453/**
454 * freq_in_rule_band - tells us if a frequency is in a frequency band
455 * @freq_range: frequency rule we want to query
456 * @freq_khz: frequency we are inquiring about
457 *
458 * This lets us know if a specific frequency rule is or is not relevant to
459 * a specific frequency's band. Bands are device specific and artificial
460 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
461 * safe for now to assume that a frequency rule should not be part of a
462 * frequency's band if the start freq or end freq are off by more than 2 GHz.
463 * This resolution can be lowered and should be considered as we add
464 * regulatory rule support for other "bands".
465 **/
466static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
467 u32 freq_khz)
468{
469#define ONE_GHZ_IN_KHZ 1000000
470 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
471 return true;
472 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
473 return true;
474 return false;
475#undef ONE_GHZ_IN_KHZ
476}
477
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500478/*
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500479 * Helper for regdom_intersect(), this does the real
480 * mathematical intersection fun
481 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700482static int reg_rules_intersect(
483 const struct ieee80211_reg_rule *rule1,
484 const struct ieee80211_reg_rule *rule2,
485 struct ieee80211_reg_rule *intersected_rule)
486{
487 const struct ieee80211_freq_range *freq_range1, *freq_range2;
488 struct ieee80211_freq_range *freq_range;
489 const struct ieee80211_power_rule *power_rule1, *power_rule2;
490 struct ieee80211_power_rule *power_rule;
491 u32 freq_diff;
492
493 freq_range1 = &rule1->freq_range;
494 freq_range2 = &rule2->freq_range;
495 freq_range = &intersected_rule->freq_range;
496
497 power_rule1 = &rule1->power_rule;
498 power_rule2 = &rule2->power_rule;
499 power_rule = &intersected_rule->power_rule;
500
501 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
502 freq_range2->start_freq_khz);
503 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
504 freq_range2->end_freq_khz);
505 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
506 freq_range2->max_bandwidth_khz);
507
508 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
509 if (freq_range->max_bandwidth_khz > freq_diff)
510 freq_range->max_bandwidth_khz = freq_diff;
511
512 power_rule->max_eirp = min(power_rule1->max_eirp,
513 power_rule2->max_eirp);
514 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
515 power_rule2->max_antenna_gain);
516
517 intersected_rule->flags = (rule1->flags | rule2->flags);
518
519 if (!is_valid_reg_rule(intersected_rule))
520 return -EINVAL;
521
522 return 0;
523}
524
525/**
526 * regdom_intersect - do the intersection between two regulatory domains
527 * @rd1: first regulatory domain
528 * @rd2: second regulatory domain
529 *
530 * Use this function to get the intersection between two regulatory domains.
531 * Once completed we will mark the alpha2 for the rd as intersected, "98",
532 * as no one single alpha2 can represent this regulatory domain.
533 *
534 * Returns a pointer to the regulatory domain structure which will hold the
535 * resulting intersection of rules between rd1 and rd2. We will
536 * kzalloc() this structure for you.
537 */
538static struct ieee80211_regdomain *regdom_intersect(
539 const struct ieee80211_regdomain *rd1,
540 const struct ieee80211_regdomain *rd2)
541{
542 int r, size_of_regd;
543 unsigned int x, y;
544 unsigned int num_rules = 0, rule_idx = 0;
545 const struct ieee80211_reg_rule *rule1, *rule2;
546 struct ieee80211_reg_rule *intersected_rule;
547 struct ieee80211_regdomain *rd;
548 /* This is just a dummy holder to help us count */
549 struct ieee80211_reg_rule irule;
550
551 /* Uses the stack temporarily for counter arithmetic */
552 intersected_rule = &irule;
553
554 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
555
556 if (!rd1 || !rd2)
557 return NULL;
558
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500559 /*
560 * First we get a count of the rules we'll need, then we actually
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700561 * build them. This is to so we can malloc() and free() a
562 * regdomain once. The reason we use reg_rules_intersect() here
563 * is it will return -EINVAL if the rule computed makes no sense.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500564 * All rules that do check out OK are valid.
565 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700566
567 for (x = 0; x < rd1->n_reg_rules; x++) {
568 rule1 = &rd1->reg_rules[x];
569 for (y = 0; y < rd2->n_reg_rules; y++) {
570 rule2 = &rd2->reg_rules[y];
571 if (!reg_rules_intersect(rule1, rule2,
572 intersected_rule))
573 num_rules++;
574 memset(intersected_rule, 0,
575 sizeof(struct ieee80211_reg_rule));
576 }
577 }
578
579 if (!num_rules)
580 return NULL;
581
582 size_of_regd = sizeof(struct ieee80211_regdomain) +
583 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
584
585 rd = kzalloc(size_of_regd, GFP_KERNEL);
586 if (!rd)
587 return NULL;
588
589 for (x = 0; x < rd1->n_reg_rules; x++) {
590 rule1 = &rd1->reg_rules[x];
591 for (y = 0; y < rd2->n_reg_rules; y++) {
592 rule2 = &rd2->reg_rules[y];
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500593 /*
594 * This time around instead of using the stack lets
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700595 * write to the target rule directly saving ourselves
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500596 * a memcpy()
597 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700598 intersected_rule = &rd->reg_rules[rule_idx];
599 r = reg_rules_intersect(rule1, rule2,
600 intersected_rule);
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500601 /*
602 * No need to memset here the intersected rule here as
603 * we're not using the stack anymore
604 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700605 if (r)
606 continue;
607 rule_idx++;
608 }
609 }
610
611 if (rule_idx != num_rules) {
612 kfree(rd);
613 return NULL;
614 }
615
616 rd->n_reg_rules = num_rules;
617 rd->alpha2[0] = '9';
618 rd->alpha2[1] = '8';
619
620 return rd;
621}
622
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500623/*
624 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
625 * want to just have the channel structure use these
626 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700627static u32 map_regdom_flags(u32 rd_flags)
628{
629 u32 channel_flags = 0;
630 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
631 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
632 if (rd_flags & NL80211_RRF_NO_IBSS)
633 channel_flags |= IEEE80211_CHAN_NO_IBSS;
634 if (rd_flags & NL80211_RRF_DFS)
635 channel_flags |= IEEE80211_CHAN_RADAR;
636 return channel_flags;
637}
638
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800639static int freq_reg_info_regd(struct wiphy *wiphy,
640 u32 center_freq,
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400641 u32 desired_bw_khz,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800642 const struct ieee80211_reg_rule **reg_rule,
643 const struct ieee80211_regdomain *custom_regd)
Johannes Berg8318d782008-01-24 19:38:38 +0100644{
645 int i;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800646 bool band_rule_found = false;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800647 const struct ieee80211_regdomain *regd;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400648 bool bw_fits = false;
649
650 if (!desired_bw_khz)
651 desired_bw_khz = MHZ_TO_KHZ(20);
Johannes Berg8318d782008-01-24 19:38:38 +0100652
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800653 regd = custom_regd ? custom_regd : cfg80211_regdomain;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800654
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500655 /*
656 * Follow the driver's regulatory domain, if present, unless a country
657 * IE has been processed or a user wants to help complaince further
658 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400659 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
660 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800661 wiphy->regd)
662 regd = wiphy->regd;
663
664 if (!regd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700665 return -EINVAL;
666
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800667 for (i = 0; i < regd->n_reg_rules; i++) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700668 const struct ieee80211_reg_rule *rr;
669 const struct ieee80211_freq_range *fr = NULL;
670 const struct ieee80211_power_rule *pr = NULL;
671
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800672 rr = &regd->reg_rules[i];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700673 fr = &rr->freq_range;
674 pr = &rr->power_rule;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800675
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500676 /*
677 * We only need to know if one frequency rule was
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800678 * was in center_freq's band, that's enough, so lets
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500679 * not overwrite it once found
680 */
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800681 if (!band_rule_found)
682 band_rule_found = freq_in_rule_band(fr, center_freq);
683
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400684 bw_fits = reg_does_bw_fit(fr,
685 center_freq,
686 desired_bw_khz);
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800687
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400688 if (band_rule_found && bw_fits) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700689 *reg_rule = rr;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400690 return 0;
Johannes Berg8318d782008-01-24 19:38:38 +0100691 }
692 }
693
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800694 if (!band_rule_found)
695 return -ERANGE;
696
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400697 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700698}
699
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400700int freq_reg_info(struct wiphy *wiphy,
701 u32 center_freq,
702 u32 desired_bw_khz,
703 const struct ieee80211_reg_rule **reg_rule)
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800704{
Luis R. Rodriguezac46d482009-05-01 18:44:50 -0400705 assert_cfg80211_lock();
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400706 return freq_reg_info_regd(wiphy,
707 center_freq,
708 desired_bw_khz,
709 reg_rule,
710 NULL);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800711}
John W. Linville4f366c52010-07-15 14:57:33 -0400712EXPORT_SYMBOL(freq_reg_info);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700713
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400714/*
715 * Note that right now we assume the desired channel bandwidth
716 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
717 * per channel, the primary and the extension channel). To support
718 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
719 * new ieee80211_channel.target_bw and re run the regulatory check
720 * on the wiphy with the target_bw specified. Then we can simply use
721 * that below for the desired_bw_khz below.
722 */
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800723static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
724 unsigned int chan_idx)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700725{
726 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400727 u32 flags, bw_flags = 0;
728 u32 desired_bw_khz = MHZ_TO_KHZ(20);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700729 const struct ieee80211_reg_rule *reg_rule = NULL;
730 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400731 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800732 struct ieee80211_supported_band *sband;
733 struct ieee80211_channel *chan;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500734 struct wiphy *request_wiphy = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800735
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500736 assert_cfg80211_lock();
737
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500738 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
739
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800740 sband = wiphy->bands[band];
741 BUG_ON(chan_idx >= sband->n_channels);
742 chan = &sband->channels[chan_idx];
743
744 flags = chan->orig_flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700745
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400746 r = freq_reg_info(wiphy,
747 MHZ_TO_KHZ(chan->center_freq),
748 desired_bw_khz,
749 &reg_rule);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700750
John W. Linville4f366c52010-07-15 14:57:33 -0400751 if (r)
Johannes Berg8318d782008-01-24 19:38:38 +0100752 return;
Johannes Berg8318d782008-01-24 19:38:38 +0100753
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700754 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400755 freq_range = &reg_rule->freq_range;
756
757 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
758 bw_flags = IEEE80211_CHAN_NO_HT40;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700759
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400760 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500761 request_wiphy && request_wiphy == wiphy &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100762 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500763 /*
764 * This gaurantees the driver's requested regulatory domain
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800765 * will always be used as a base for further regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500766 * settings
767 */
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800768 chan->flags = chan->orig_flags =
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400769 map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800770 chan->max_antenna_gain = chan->orig_mag =
771 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800772 chan->max_power = chan->orig_mpwr =
773 (int) MBM_TO_DBM(power_rule->max_eirp);
774 return;
775 }
776
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400777 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
Johannes Berg8318d782008-01-24 19:38:38 +0100778 chan->max_antenna_gain = min(chan->orig_mag,
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700779 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
John W. Linville253898c2008-04-03 15:32:54 -0400780 if (chan->orig_mpwr)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700781 chan->max_power = min(chan->orig_mpwr,
782 (int) MBM_TO_DBM(power_rule->max_eirp));
John W. Linville253898c2008-04-03 15:32:54 -0400783 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700784 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
Johannes Berg8318d782008-01-24 19:38:38 +0100785}
786
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800787static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
Johannes Berg8318d782008-01-24 19:38:38 +0100788{
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800789 unsigned int i;
790 struct ieee80211_supported_band *sband;
791
792 BUG_ON(!wiphy->bands[band]);
793 sband = wiphy->bands[band];
Johannes Berg8318d782008-01-24 19:38:38 +0100794
795 for (i = 0; i < sband->n_channels; i++)
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800796 handle_channel(wiphy, band, i);
Johannes Berg8318d782008-01-24 19:38:38 +0100797}
798
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400799static bool ignore_reg_update(struct wiphy *wiphy,
800 enum nl80211_reg_initiator initiator)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800801{
802 if (!last_request)
803 return true;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400804 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100805 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800806 return true;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500807 /*
808 * wiphy->regd will be set once the device has its own
809 * desired regulatory domain set
810 */
Johannes Berg5be83de2009-11-19 00:56:28 +0100811 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800812 !is_world_regdom(last_request->alpha2))
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800813 return true;
814 return false;
815}
816
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400817static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700818{
Johannes Berg79c97e92009-07-07 03:56:12 +0200819 struct cfg80211_registered_device *rdev;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700820
Johannes Berg79c97e92009-07-07 03:56:12 +0200821 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
822 wiphy_update_regulatory(&rdev->wiphy, initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700823}
824
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500825static void handle_reg_beacon(struct wiphy *wiphy,
826 unsigned int chan_idx,
827 struct reg_beacon *reg_beacon)
828{
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500829 struct ieee80211_supported_band *sband;
830 struct ieee80211_channel *chan;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400831 bool channel_changed = false;
832 struct ieee80211_channel chan_before;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500833
834 assert_cfg80211_lock();
835
836 sband = wiphy->bands[reg_beacon->chan.band];
837 chan = &sband->channels[chan_idx];
838
839 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
840 return;
841
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400842 if (chan->beacon_found)
843 return;
844
845 chan->beacon_found = true;
846
Johannes Berg5be83de2009-11-19 00:56:28 +0100847 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700848 return;
849
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400850 chan_before.center_freq = chan->center_freq;
851 chan_before.flags = chan->flags;
852
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700853 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500854 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400855 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500856 }
857
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700858 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500859 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400860 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500861 }
862
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400863 if (channel_changed)
864 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500865}
866
867/*
868 * Called when a scan on a wiphy finds a beacon on
869 * new channel
870 */
871static void wiphy_update_new_beacon(struct wiphy *wiphy,
872 struct reg_beacon *reg_beacon)
873{
874 unsigned int i;
875 struct ieee80211_supported_band *sband;
876
877 assert_cfg80211_lock();
878
879 if (!wiphy->bands[reg_beacon->chan.band])
880 return;
881
882 sband = wiphy->bands[reg_beacon->chan.band];
883
884 for (i = 0; i < sband->n_channels; i++)
885 handle_reg_beacon(wiphy, i, reg_beacon);
886}
887
888/*
889 * Called upon reg changes or a new wiphy is added
890 */
891static void wiphy_update_beacon_reg(struct wiphy *wiphy)
892{
893 unsigned int i;
894 struct ieee80211_supported_band *sband;
895 struct reg_beacon *reg_beacon;
896
897 assert_cfg80211_lock();
898
899 if (list_empty(&reg_beacon_list))
900 return;
901
902 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
903 if (!wiphy->bands[reg_beacon->chan.band])
904 continue;
905 sband = wiphy->bands[reg_beacon->chan.band];
906 for (i = 0; i < sband->n_channels; i++)
907 handle_reg_beacon(wiphy, i, reg_beacon);
908 }
909}
910
911static bool reg_is_world_roaming(struct wiphy *wiphy)
912{
913 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
914 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
915 return true;
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -0400916 if (last_request &&
917 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100918 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500919 return true;
920 return false;
921}
922
923/* Reap the advantages of previously found beacons */
924static void reg_process_beacons(struct wiphy *wiphy)
925{
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -0400926 /*
927 * Means we are just firing up cfg80211, so no beacons would
928 * have been processed yet.
929 */
930 if (!last_request)
931 return;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500932 if (!reg_is_world_roaming(wiphy))
933 return;
934 wiphy_update_beacon_reg(wiphy);
935}
936
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400937static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
938{
939 if (!chan)
940 return true;
941 if (chan->flags & IEEE80211_CHAN_DISABLED)
942 return true;
943 /* This would happen when regulatory rules disallow HT40 completely */
944 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
945 return true;
946 return false;
947}
948
949static void reg_process_ht_flags_channel(struct wiphy *wiphy,
950 enum ieee80211_band band,
951 unsigned int chan_idx)
952{
953 struct ieee80211_supported_band *sband;
954 struct ieee80211_channel *channel;
955 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
956 unsigned int i;
957
958 assert_cfg80211_lock();
959
960 sband = wiphy->bands[band];
961 BUG_ON(chan_idx >= sband->n_channels);
962 channel = &sband->channels[chan_idx];
963
964 if (is_ht40_not_allowed(channel)) {
965 channel->flags |= IEEE80211_CHAN_NO_HT40;
966 return;
967 }
968
969 /*
970 * We need to ensure the extension channels exist to
971 * be able to use HT40- or HT40+, this finds them (or not)
972 */
973 for (i = 0; i < sband->n_channels; i++) {
974 struct ieee80211_channel *c = &sband->channels[i];
975 if (c->center_freq == (channel->center_freq - 20))
976 channel_before = c;
977 if (c->center_freq == (channel->center_freq + 20))
978 channel_after = c;
979 }
980
981 /*
982 * Please note that this assumes target bandwidth is 20 MHz,
983 * if that ever changes we also need to change the below logic
984 * to include that as well.
985 */
986 if (is_ht40_not_allowed(channel_before))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -0400987 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400988 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -0400989 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400990
991 if (is_ht40_not_allowed(channel_after))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -0400992 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400993 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -0400994 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400995}
996
997static void reg_process_ht_flags_band(struct wiphy *wiphy,
998 enum ieee80211_band band)
999{
1000 unsigned int i;
1001 struct ieee80211_supported_band *sband;
1002
1003 BUG_ON(!wiphy->bands[band]);
1004 sband = wiphy->bands[band];
1005
1006 for (i = 0; i < sband->n_channels; i++)
1007 reg_process_ht_flags_channel(wiphy, band, i);
1008}
1009
1010static void reg_process_ht_flags(struct wiphy *wiphy)
1011{
1012 enum ieee80211_band band;
1013
1014 if (!wiphy)
1015 return;
1016
1017 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1018 if (wiphy->bands[band])
1019 reg_process_ht_flags_band(wiphy, band);
1020 }
1021
1022}
1023
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001024void wiphy_update_regulatory(struct wiphy *wiphy,
1025 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +01001026{
1027 enum ieee80211_band band;
Luis R. Rodriguezd46e5b12009-01-22 15:05:50 -08001028
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001029 if (ignore_reg_update(wiphy, initiator))
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001030 goto out;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001031 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Johannes Berg8318d782008-01-24 19:38:38 +01001032 if (wiphy->bands[band])
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -08001033 handle_band(wiphy, band);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001034 }
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001035out:
1036 reg_process_beacons(wiphy);
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001037 reg_process_ht_flags(wiphy);
Luis R. Rodriguez560e28e2009-01-07 17:43:32 -08001038 if (wiphy->reg_notifier)
Luis R. Rodriguez716f9392009-01-22 15:05:51 -08001039 wiphy->reg_notifier(wiphy, last_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001040}
1041
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001042static void handle_channel_custom(struct wiphy *wiphy,
1043 enum ieee80211_band band,
1044 unsigned int chan_idx,
1045 const struct ieee80211_regdomain *regd)
1046{
1047 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001048 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1049 u32 bw_flags = 0;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001050 const struct ieee80211_reg_rule *reg_rule = NULL;
1051 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001052 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001053 struct ieee80211_supported_band *sband;
1054 struct ieee80211_channel *chan;
1055
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001056 assert_reg_lock();
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001057
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001058 sband = wiphy->bands[band];
1059 BUG_ON(chan_idx >= sband->n_channels);
1060 chan = &sband->channels[chan_idx];
1061
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001062 r = freq_reg_info_regd(wiphy,
1063 MHZ_TO_KHZ(chan->center_freq),
1064 desired_bw_khz,
1065 &reg_rule,
1066 regd);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001067
1068 if (r) {
1069 chan->flags = IEEE80211_CHAN_DISABLED;
1070 return;
1071 }
1072
1073 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001074 freq_range = &reg_rule->freq_range;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001075
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001076 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1077 bw_flags = IEEE80211_CHAN_NO_HT40;
1078
1079 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001080 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001081 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1082}
1083
1084static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1085 const struct ieee80211_regdomain *regd)
1086{
1087 unsigned int i;
1088 struct ieee80211_supported_band *sband;
1089
1090 BUG_ON(!wiphy->bands[band]);
1091 sband = wiphy->bands[band];
1092
1093 for (i = 0; i < sband->n_channels; i++)
1094 handle_channel_custom(wiphy, band, i, regd);
1095}
1096
1097/* Used by drivers prior to wiphy registration */
1098void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1099 const struct ieee80211_regdomain *regd)
1100{
1101 enum ieee80211_band band;
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001102 unsigned int bands_set = 0;
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001103
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001104 mutex_lock(&reg_mutex);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001105 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001106 if (!wiphy->bands[band])
1107 continue;
1108 handle_band_custom(wiphy, band, regd);
1109 bands_set++;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001110 }
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001111 mutex_unlock(&reg_mutex);
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001112
1113 /*
1114 * no point in calling this if it won't have any effect
1115 * on your device's supportd bands.
1116 */
1117 WARN_ON(!bands_set);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001118}
1119EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1120
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001121/*
1122 * Return value which can be used by ignore_request() to indicate
1123 * it has been determined we should intersect two regulatory domains
1124 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001125#define REG_INTERSECT 1
1126
Johannes Berg84fa4f42008-10-24 20:32:23 +02001127/* This has the logic which determines when a new request
1128 * should be ignored. */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001129static int ignore_request(struct wiphy *wiphy,
1130 struct regulatory_request *pending_request)
Johannes Berg84fa4f42008-10-24 20:32:23 +02001131{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001132 struct wiphy *last_wiphy = NULL;
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001133
1134 assert_cfg80211_lock();
1135
Johannes Berg84fa4f42008-10-24 20:32:23 +02001136 /* All initial requests are respected */
1137 if (!last_request)
1138 return 0;
1139
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001140 switch (pending_request->initiator) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001141 case NL80211_REGDOM_SET_BY_CORE:
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001142 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001143 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001144
1145 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1146
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001147 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001148 return -EINVAL;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001149 if (last_request->initiator ==
1150 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001151 if (last_wiphy != wiphy) {
Johannes Berg84fa4f42008-10-24 20:32:23 +02001152 /*
1153 * Two cards with two APs claiming different
Thadeu Lima de Souza Cascardo1fe90b02009-08-11 11:18:42 -03001154 * Country IE alpha2s. We could
Johannes Berg84fa4f42008-10-24 20:32:23 +02001155 * intersect them, but that seems unlikely
1156 * to be correct. Reject second one for now.
1157 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001158 if (regdom_changes(pending_request->alpha2))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001159 return -EOPNOTSUPP;
1160 return -EALREADY;
1161 }
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001162 /*
1163 * Two consecutive Country IE hints on the same wiphy.
1164 * This should be picked up early by the driver/stack
1165 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001166 if (WARN_ON(regdom_changes(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001167 return 0;
1168 return -EALREADY;
1169 }
Luis R. Rodrigueza171fba2010-10-18 17:44:51 -07001170 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001171 case NL80211_REGDOM_SET_BY_DRIVER:
1172 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001173 if (regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001174 return 0;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001175 return -EALREADY;
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001176 }
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001177
1178 /*
1179 * This would happen if you unplug and plug your card
1180 * back in or if you add a new device for which the previously
1181 * loaded card also agrees on the regulatory domain.
1182 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001183 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001184 !regdom_changes(pending_request->alpha2))
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001185 return -EALREADY;
1186
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001187 return REG_INTERSECT;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001188 case NL80211_REGDOM_SET_BY_USER:
1189 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001190 return REG_INTERSECT;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001191 /*
1192 * If the user knows better the user should set the regdom
1193 * to their country before the IE is picked up
1194 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001195 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001196 last_request->intersect)
1197 return -EOPNOTSUPP;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001198 /*
1199 * Process user requests only after previous user/driver/core
1200 * requests have been processed
1201 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001202 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1203 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1204 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
Luis R. Rodriguez69b15722009-02-21 00:04:33 -05001205 if (regdom_changes(last_request->alpha2))
Luis R. Rodriguez5eebade2009-01-22 15:05:47 -08001206 return -EAGAIN;
1207 }
1208
John W. Linvillebaeb66f2009-12-18 17:59:02 -05001209 if (!regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001210 return -EALREADY;
1211
Johannes Berg84fa4f42008-10-24 20:32:23 +02001212 return 0;
1213 }
1214
1215 return -EINVAL;
1216}
1217
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001218/**
1219 * __regulatory_hint - hint to the wireless core a regulatory domain
1220 * @wiphy: if the hint comes from country information from an AP, this
1221 * is required to be set to the wiphy that received the information
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001222 * @pending_request: the regulatory request currently being processed
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001223 *
1224 * The Wireless subsystem can use this function to hint to the wireless core
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001225 * what it believes should be the current regulatory domain.
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001226 *
1227 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1228 * already been set or other standard error codes.
1229 *
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001230 * Caller must hold &cfg80211_mutex and &reg_mutex
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001231 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001232static int __regulatory_hint(struct wiphy *wiphy,
1233 struct regulatory_request *pending_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001234{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001235 bool intersect = false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001236 int r = 0;
1237
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001238 assert_cfg80211_lock();
1239
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001240 r = ignore_request(wiphy, pending_request);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001241
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001242 if (r == REG_INTERSECT) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001243 if (pending_request->initiator ==
1244 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001245 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001246 if (r) {
1247 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001248 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001249 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001250 }
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001251 intersect = true;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001252 } else if (r) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001253 /*
1254 * If the regulatory domain being requested by the
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001255 * driver has already been set just copy it to the
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001256 * wiphy
1257 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001258 if (r == -EALREADY &&
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001259 pending_request->initiator ==
1260 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001261 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001262 if (r) {
1263 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001264 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001265 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001266 r = -EALREADY;
1267 goto new_request;
1268 }
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001269 kfree(pending_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001270 return r;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001271 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001272
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001273new_request:
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001274 kfree(last_request);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001275
1276 last_request = pending_request;
1277 last_request->intersect = intersect;
1278
1279 pending_request = NULL;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001280
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001281 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1282 user_alpha2[0] = last_request->alpha2[0];
1283 user_alpha2[1] = last_request->alpha2[1];
1284 }
1285
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001286 /* When r == REG_INTERSECT we do need to call CRDA */
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001287 if (r < 0) {
1288 /*
1289 * Since CRDA will not be called in this case as we already
1290 * have applied the requested regulatory domain before we just
1291 * inform userspace we have processed the request
1292 */
1293 if (r == -EALREADY)
1294 nl80211_send_reg_change_event(last_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001295 return r;
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001296 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001297
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001298 return call_crda(last_request->alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001299}
1300
Luis R. Rodriguez30a548c2009-05-02 01:17:27 -04001301/* This processes *all* regulatory hints */
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001302static void reg_process_hint(struct regulatory_request *reg_request)
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001303{
1304 int r = 0;
1305 struct wiphy *wiphy = NULL;
Yuri Ershovc4c32292010-06-29 15:08:08 +04001306 enum nl80211_reg_initiator initiator = reg_request->initiator;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001307
1308 BUG_ON(!reg_request->alpha2);
1309
1310 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001311 mutex_lock(&reg_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001312
1313 if (wiphy_idx_valid(reg_request->wiphy_idx))
1314 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1315
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001316 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001317 !wiphy) {
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001318 kfree(reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001319 goto out;
1320 }
1321
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001322 r = __regulatory_hint(wiphy, reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001323 /* This is required so that the orig_* parameters are saved */
Johannes Berg5be83de2009-11-19 00:56:28 +01001324 if (r == -EALREADY && wiphy &&
1325 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
Yuri Ershovc4c32292010-06-29 15:08:08 +04001326 wiphy_update_regulatory(wiphy, initiator);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001327out:
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001328 mutex_unlock(&reg_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001329 mutex_unlock(&cfg80211_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001330}
1331
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001332/* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001333static void reg_process_pending_hints(void)
1334 {
1335 struct regulatory_request *reg_request;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001336
1337 spin_lock(&reg_requests_lock);
1338 while (!list_empty(&reg_requests_list)) {
1339 reg_request = list_first_entry(&reg_requests_list,
1340 struct regulatory_request,
1341 list);
1342 list_del_init(&reg_request->list);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001343
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001344 spin_unlock(&reg_requests_lock);
1345 reg_process_hint(reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001346 spin_lock(&reg_requests_lock);
1347 }
1348 spin_unlock(&reg_requests_lock);
1349}
1350
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001351/* Processes beacon hints -- this has nothing to do with country IEs */
1352static void reg_process_pending_beacon_hints(void)
1353{
Johannes Berg79c97e92009-07-07 03:56:12 +02001354 struct cfg80211_registered_device *rdev;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001355 struct reg_beacon *pending_beacon, *tmp;
1356
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001357 /*
1358 * No need to hold the reg_mutex here as we just touch wiphys
1359 * and do not read or access regulatory variables.
1360 */
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001361 mutex_lock(&cfg80211_mutex);
1362
1363 /* This goes through the _pending_ beacon list */
1364 spin_lock_bh(&reg_pending_beacons_lock);
1365
1366 if (list_empty(&reg_pending_beacons)) {
1367 spin_unlock_bh(&reg_pending_beacons_lock);
1368 goto out;
1369 }
1370
1371 list_for_each_entry_safe(pending_beacon, tmp,
1372 &reg_pending_beacons, list) {
1373
1374 list_del_init(&pending_beacon->list);
1375
1376 /* Applies the beacon hint to current wiphys */
Johannes Berg79c97e92009-07-07 03:56:12 +02001377 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1378 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001379
1380 /* Remembers the beacon hint for new wiphys or reg changes */
1381 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1382 }
1383
1384 spin_unlock_bh(&reg_pending_beacons_lock);
1385out:
1386 mutex_unlock(&cfg80211_mutex);
1387}
1388
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001389static void reg_todo(struct work_struct *work)
1390{
1391 reg_process_pending_hints();
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001392 reg_process_pending_beacon_hints();
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001393}
1394
1395static DECLARE_WORK(reg_work, reg_todo);
1396
1397static void queue_regulatory_request(struct regulatory_request *request)
1398{
John W. Linvillec61029c2010-08-05 14:26:24 -04001399 if (isalpha(request->alpha2[0]))
1400 request->alpha2[0] = toupper(request->alpha2[0]);
1401 if (isalpha(request->alpha2[1]))
1402 request->alpha2[1] = toupper(request->alpha2[1]);
1403
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001404 spin_lock(&reg_requests_lock);
1405 list_add_tail(&request->list, &reg_requests_list);
1406 spin_unlock(&reg_requests_lock);
1407
1408 schedule_work(&reg_work);
1409}
1410
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001411/*
1412 * Core regulatory hint -- happens during cfg80211_init()
1413 * and when we restore regulatory settings.
1414 */
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001415static int regulatory_hint_core(const char *alpha2)
1416{
1417 struct regulatory_request *request;
1418
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001419 kfree(last_request);
1420 last_request = NULL;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001421
1422 request = kzalloc(sizeof(struct regulatory_request),
1423 GFP_KERNEL);
1424 if (!request)
1425 return -ENOMEM;
1426
1427 request->alpha2[0] = alpha2[0];
1428 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001429 request->initiator = NL80211_REGDOM_SET_BY_CORE;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001430
Luis R. Rodriguez5078b2e2009-05-13 17:04:42 -04001431 /*
1432 * This ensures last_request is populated once modules
1433 * come swinging in and calling regulatory hints and
1434 * wiphy_apply_custom_regulatory().
1435 */
Luis R. Rodrigueza2bff262010-01-29 19:58:56 -05001436 reg_process_hint(request);
Luis R. Rodriguez5078b2e2009-05-13 17:04:42 -04001437
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001438 return 0;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001439}
1440
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001441/* User hints */
1442int regulatory_hint_user(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001443{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001444 struct regulatory_request *request;
1445
Johannes Bergbe3d4812008-10-24 20:32:21 +02001446 BUG_ON(!alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001447
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001448 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1449 if (!request)
1450 return -ENOMEM;
1451
1452 request->wiphy_idx = WIPHY_IDX_STALE;
1453 request->alpha2[0] = alpha2[0];
1454 request->alpha2[1] = alpha2[1];
Luis R. Rodrigueze12822e2010-01-04 11:37:39 -05001455 request->initiator = NL80211_REGDOM_SET_BY_USER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001456
1457 queue_regulatory_request(request);
1458
1459 return 0;
1460}
1461
1462/* Driver hints */
1463int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1464{
1465 struct regulatory_request *request;
1466
1467 BUG_ON(!alpha2);
1468 BUG_ON(!wiphy);
1469
1470 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1471 if (!request)
1472 return -ENOMEM;
1473
1474 request->wiphy_idx = get_wiphy_idx(wiphy);
1475
1476 /* Must have registered wiphy first */
1477 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1478
1479 request->alpha2[0] = alpha2[0];
1480 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001481 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001482
1483 queue_regulatory_request(request);
1484
1485 return 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001486}
1487EXPORT_SYMBOL(regulatory_hint);
1488
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001489/*
1490 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1491 * therefore cannot iterate over the rdev list here.
1492 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001493void regulatory_hint_11d(struct wiphy *wiphy,
Luis R. Rodriguez84920e32010-01-14 20:08:20 -05001494 enum ieee80211_band band,
1495 u8 *country_ie,
1496 u8 country_ie_len)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001497{
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001498 char alpha2[2];
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001499 enum environment_cap env = ENVIRON_ANY;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001500 struct regulatory_request *request;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001501
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001502 mutex_lock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001503
Luis R. Rodriguez9828b012009-07-30 17:38:06 -07001504 if (unlikely(!last_request))
1505 goto out;
Luis R. Rodriguezd335fe62009-02-21 00:04:27 -05001506
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001507 /* IE len must be evenly divisible by 2 */
1508 if (country_ie_len & 0x01)
1509 goto out;
1510
1511 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1512 goto out;
1513
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001514 alpha2[0] = country_ie[0];
1515 alpha2[1] = country_ie[1];
1516
1517 if (country_ie[2] == 'I')
1518 env = ENVIRON_INDOOR;
1519 else if (country_ie[2] == 'O')
1520 env = ENVIRON_OUTDOOR;
1521
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001522 /*
Luis R. Rodriguez8b19e6c2009-07-30 17:38:09 -07001523 * We will run this only upon a successful connection on cfg80211.
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001524 * We leave conflict resolution to the workqueue, where can hold
1525 * cfg80211_mutex.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001526 */
Luis R. Rodriguezcc0b6fe2009-03-20 23:53:05 -04001527 if (likely(last_request->initiator ==
1528 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001529 wiphy_idx_valid(last_request->wiphy_idx)))
1530 goto out;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001531
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001532 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1533 if (!request)
Dan Carpenterf9f9b6e2010-07-22 13:26:50 +02001534 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001535
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001536 request->wiphy_idx = get_wiphy_idx(wiphy);
John W. Linville4f366c52010-07-15 14:57:33 -04001537 request->alpha2[0] = alpha2[0];
1538 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001539 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001540 request->country_ie_env = env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001541
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001542 mutex_unlock(&reg_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001543
1544 queue_regulatory_request(request);
1545
1546 return;
Luis R. Rodriguez0441d6f2009-02-21 00:04:29 -05001547
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001548out:
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001549 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001550}
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001551
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001552static void restore_alpha2(char *alpha2, bool reset_user)
1553{
1554 /* indicates there is no alpha2 to consider for restoration */
1555 alpha2[0] = '9';
1556 alpha2[1] = '7';
1557
1558 /* The user setting has precedence over the module parameter */
1559 if (is_user_regdom_saved()) {
1560 /* Unless we're asked to ignore it and reset it */
1561 if (reset_user) {
1562 REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
1563 "including user preference\n");
1564 user_alpha2[0] = '9';
1565 user_alpha2[1] = '7';
1566
1567 /*
1568 * If we're ignoring user settings, we still need to
1569 * check the module parameter to ensure we put things
1570 * back as they were for a full restore.
1571 */
1572 if (!is_world_regdom(ieee80211_regdom)) {
1573 REG_DBG_PRINT("cfg80211: Keeping preference on "
1574 "module parameter ieee80211_regdom: %c%c\n",
1575 ieee80211_regdom[0],
1576 ieee80211_regdom[1]);
1577 alpha2[0] = ieee80211_regdom[0];
1578 alpha2[1] = ieee80211_regdom[1];
1579 }
1580 } else {
1581 REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
1582 "while preserving user preference for: %c%c\n",
1583 user_alpha2[0],
1584 user_alpha2[1]);
1585 alpha2[0] = user_alpha2[0];
1586 alpha2[1] = user_alpha2[1];
1587 }
1588 } else if (!is_world_regdom(ieee80211_regdom)) {
1589 REG_DBG_PRINT("cfg80211: Keeping preference on "
1590 "module parameter ieee80211_regdom: %c%c\n",
1591 ieee80211_regdom[0],
1592 ieee80211_regdom[1]);
1593 alpha2[0] = ieee80211_regdom[0];
1594 alpha2[1] = ieee80211_regdom[1];
1595 } else
1596 REG_DBG_PRINT("cfg80211: Restoring regulatory settings\n");
1597}
1598
1599/*
1600 * Restoring regulatory settings involves ingoring any
1601 * possibly stale country IE information and user regulatory
1602 * settings if so desired, this includes any beacon hints
1603 * learned as we could have traveled outside to another country
1604 * after disconnection. To restore regulatory settings we do
1605 * exactly what we did at bootup:
1606 *
1607 * - send a core regulatory hint
1608 * - send a user regulatory hint if applicable
1609 *
1610 * Device drivers that send a regulatory hint for a specific country
1611 * keep their own regulatory domain on wiphy->regd so that does does
1612 * not need to be remembered.
1613 */
1614static void restore_regulatory_settings(bool reset_user)
1615{
1616 char alpha2[2];
1617 struct reg_beacon *reg_beacon, *btmp;
1618
1619 mutex_lock(&cfg80211_mutex);
1620 mutex_lock(&reg_mutex);
1621
1622 reset_regdomains();
1623 restore_alpha2(alpha2, reset_user);
1624
1625 /* Clear beacon hints */
1626 spin_lock_bh(&reg_pending_beacons_lock);
1627 if (!list_empty(&reg_pending_beacons)) {
1628 list_for_each_entry_safe(reg_beacon, btmp,
1629 &reg_pending_beacons, list) {
1630 list_del(&reg_beacon->list);
1631 kfree(reg_beacon);
1632 }
1633 }
1634 spin_unlock_bh(&reg_pending_beacons_lock);
1635
1636 if (!list_empty(&reg_beacon_list)) {
1637 list_for_each_entry_safe(reg_beacon, btmp,
1638 &reg_beacon_list, list) {
1639 list_del(&reg_beacon->list);
1640 kfree(reg_beacon);
1641 }
1642 }
1643
1644 /* First restore to the basic regulatory settings */
1645 cfg80211_regdomain = cfg80211_world_regdom;
1646
1647 mutex_unlock(&reg_mutex);
1648 mutex_unlock(&cfg80211_mutex);
1649
1650 regulatory_hint_core(cfg80211_regdomain->alpha2);
1651
1652 /*
1653 * This restores the ieee80211_regdom module parameter
1654 * preference or the last user requested regulatory
1655 * settings, user regulatory settings takes precedence.
1656 */
1657 if (is_an_alpha2(alpha2))
1658 regulatory_hint_user(user_alpha2);
1659}
1660
1661
1662void regulatory_hint_disconnect(void)
1663{
1664 REG_DBG_PRINT("cfg80211: All devices are disconnected, going to "
1665 "restore regulatory settings\n");
1666 restore_regulatory_settings(false);
1667}
1668
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001669static bool freq_is_chan_12_13_14(u16 freq)
1670{
1671 if (freq == ieee80211_channel_to_frequency(12) ||
1672 freq == ieee80211_channel_to_frequency(13) ||
1673 freq == ieee80211_channel_to_frequency(14))
1674 return true;
1675 return false;
1676}
1677
1678int regulatory_hint_found_beacon(struct wiphy *wiphy,
1679 struct ieee80211_channel *beacon_chan,
1680 gfp_t gfp)
1681{
1682 struct reg_beacon *reg_beacon;
1683
1684 if (likely((beacon_chan->beacon_found ||
1685 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1686 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1687 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1688 return 0;
1689
1690 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1691 if (!reg_beacon)
1692 return -ENOMEM;
1693
Luis R. Rodriguez4113f752010-01-04 11:50:11 -05001694 REG_DBG_PRINT("cfg80211: Found new beacon on "
1695 "frequency: %d MHz (Ch %d) on %s\n",
1696 beacon_chan->center_freq,
1697 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1698 wiphy_name(wiphy));
1699
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001700 memcpy(&reg_beacon->chan, beacon_chan,
1701 sizeof(struct ieee80211_channel));
1702
1703
1704 /*
1705 * Since we can be called from BH or and non-BH context
1706 * we must use spin_lock_bh()
1707 */
1708 spin_lock_bh(&reg_pending_beacons_lock);
1709 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1710 spin_unlock_bh(&reg_pending_beacons_lock);
1711
1712 schedule_work(&reg_work);
1713
1714 return 0;
1715}
1716
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001717static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001718{
1719 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001720 const struct ieee80211_reg_rule *reg_rule = NULL;
1721 const struct ieee80211_freq_range *freq_range = NULL;
1722 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001723
Kalle Valo269ac5f2009-12-01 10:47:15 +02001724 printk(KERN_INFO " (start_freq - end_freq @ bandwidth), "
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001725 "(max_antenna_gain, max_eirp)\n");
1726
1727 for (i = 0; i < rd->n_reg_rules; i++) {
1728 reg_rule = &rd->reg_rules[i];
1729 freq_range = &reg_rule->freq_range;
1730 power_rule = &reg_rule->power_rule;
1731
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001732 /*
1733 * There may not be documentation for max antenna gain
1734 * in certain regions
1735 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001736 if (power_rule->max_antenna_gain)
Kalle Valo269ac5f2009-12-01 10:47:15 +02001737 printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), "
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001738 "(%d mBi, %d mBm)\n",
1739 freq_range->start_freq_khz,
1740 freq_range->end_freq_khz,
1741 freq_range->max_bandwidth_khz,
1742 power_rule->max_antenna_gain,
1743 power_rule->max_eirp);
1744 else
Kalle Valo269ac5f2009-12-01 10:47:15 +02001745 printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), "
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001746 "(N/A, %d mBm)\n",
1747 freq_range->start_freq_khz,
1748 freq_range->end_freq_khz,
1749 freq_range->max_bandwidth_khz,
1750 power_rule->max_eirp);
1751 }
1752}
1753
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001754static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001755{
1756
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001757 if (is_intersected_alpha2(rd->alpha2)) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001758
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001759 if (last_request->initiator ==
1760 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Johannes Berg79c97e92009-07-07 03:56:12 +02001761 struct cfg80211_registered_device *rdev;
1762 rdev = cfg80211_rdev_by_wiphy_idx(
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001763 last_request->wiphy_idx);
Johannes Berg79c97e92009-07-07 03:56:12 +02001764 if (rdev) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001765 printk(KERN_INFO "cfg80211: Current regulatory "
1766 "domain updated by AP to: %c%c\n",
Johannes Berg79c97e92009-07-07 03:56:12 +02001767 rdev->country_ie_alpha2[0],
1768 rdev->country_ie_alpha2[1]);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001769 } else
1770 printk(KERN_INFO "cfg80211: Current regulatory "
Frans Pop55f98932010-03-24 19:46:29 +01001771 "domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001772 } else
Frans Pop55f98932010-03-24 19:46:29 +01001773 printk(KERN_INFO "cfg80211: Current regulatory "
1774 "domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001775 } else if (is_world_regdom(rd->alpha2))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001776 printk(KERN_INFO "cfg80211: World regulatory "
1777 "domain updated:\n");
1778 else {
1779 if (is_unknown_alpha2(rd->alpha2))
1780 printk(KERN_INFO "cfg80211: Regulatory domain "
1781 "changed to driver built-in settings "
1782 "(unknown country)\n");
1783 else
1784 printk(KERN_INFO "cfg80211: Regulatory domain "
1785 "changed to country: %c%c\n",
1786 rd->alpha2[0], rd->alpha2[1]);
1787 }
1788 print_rd_rules(rd);
1789}
1790
Johannes Berg2df78162008-10-28 16:49:41 +01001791static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001792{
1793 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1794 rd->alpha2[0], rd->alpha2[1]);
1795 print_rd_rules(rd);
1796}
1797
Johannes Bergd2372b32008-10-24 20:32:20 +02001798/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001799static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001800{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001801 const struct ieee80211_regdomain *intersected_rd = NULL;
Johannes Berg79c97e92009-07-07 03:56:12 +02001802 struct cfg80211_registered_device *rdev = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001803 struct wiphy *request_wiphy;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001804 /* Some basic sanity checks first */
1805
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001806 if (is_world_regdom(rd->alpha2)) {
Johannes Bergf6037d02008-10-21 11:01:33 +02001807 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001808 return -EINVAL;
1809 update_world_regdomain(rd);
1810 return 0;
1811 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001812
1813 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1814 !is_unknown_alpha2(rd->alpha2))
1815 return -EINVAL;
1816
Johannes Bergf6037d02008-10-21 11:01:33 +02001817 if (!last_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001818 return -EINVAL;
1819
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001820 /*
1821 * Lets only bother proceeding on the same alpha2 if the current
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001822 * rd is non static (it means CRDA was present and was used last)
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001823 * and the pending request came in from a country IE
1824 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001825 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001826 /*
1827 * If someone else asked us to change the rd lets only bother
1828 * checking if the alpha2 changes if CRDA was already called
1829 */
John W. Linvillebaeb66f2009-12-18 17:59:02 -05001830 if (!regdom_changes(rd->alpha2))
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001831 return -EINVAL;
1832 }
1833
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001834 /*
1835 * Now lets set the regulatory domain, update all driver channels
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001836 * and finally inform them of what we have done, in case they want
1837 * to review or adjust their own settings based on their own
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001838 * internal EEPROM data
1839 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001840
Johannes Bergf6037d02008-10-21 11:01:33 +02001841 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001842 return -EINVAL;
1843
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08001844 if (!is_valid_rd(rd)) {
1845 printk(KERN_ERR "cfg80211: Invalid "
1846 "regulatory domain detected:\n");
1847 print_regdomain_info(rd);
1848 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001849 }
1850
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001851 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1852
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001853 if (!last_request->intersect) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001854 int r;
1855
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001856 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001857 reset_regdomains();
1858 cfg80211_regdomain = rd;
1859 return 0;
1860 }
1861
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001862 /*
1863 * For a driver hint, lets copy the regulatory domain the
1864 * driver wanted to the wiphy to deal with conflicts
1865 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001866
Luis R. Rodriguez558f6d32009-06-08 18:54:37 -07001867 /*
1868 * Userspace could have sent two replies with only
1869 * one kernel request.
1870 */
1871 if (request_wiphy->regd)
1872 return -EALREADY;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001873
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001874 r = reg_copy_regd(&request_wiphy->regd, rd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001875 if (r)
1876 return r;
1877
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001878 reset_regdomains();
1879 cfg80211_regdomain = rd;
1880 return 0;
1881 }
1882
1883 /* Intersection requires a bit more work */
1884
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001885 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001886
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001887 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1888 if (!intersected_rd)
1889 return -EINVAL;
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001890
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001891 /*
1892 * We can trash what CRDA provided now.
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001893 * However if a driver requested this specific regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001894 * domain we keep it for its private use
1895 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001896 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001897 request_wiphy->regd = rd;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001898 else
1899 kfree(rd);
1900
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001901 rd = NULL;
1902
1903 reset_regdomains();
1904 cfg80211_regdomain = intersected_rd;
1905
1906 return 0;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001907 }
1908
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001909 if (!intersected_rd)
1910 return -EINVAL;
1911
Johannes Berg79c97e92009-07-07 03:56:12 +02001912 rdev = wiphy_to_dev(request_wiphy);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001913
Johannes Berg79c97e92009-07-07 03:56:12 +02001914 rdev->country_ie_alpha2[0] = rd->alpha2[0];
1915 rdev->country_ie_alpha2[1] = rd->alpha2[1];
1916 rdev->env = last_request->country_ie_env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001917
1918 BUG_ON(intersected_rd == rd);
1919
1920 kfree(rd);
1921 rd = NULL;
1922
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001923 reset_regdomains();
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001924 cfg80211_regdomain = intersected_rd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001925
1926 return 0;
1927}
1928
1929
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001930/*
1931 * Use this call to set the current regulatory domain. Conflicts with
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001932 * multiple drivers can be ironed out later. Caller must've already
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001933 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
1934 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001935int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001936{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001937 int r;
1938
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001939 assert_cfg80211_lock();
1940
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001941 mutex_lock(&reg_mutex);
1942
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001943 /* Note that this doesn't update the wiphys, this is done below */
1944 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +02001945 if (r) {
1946 kfree(rd);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001947 mutex_unlock(&reg_mutex);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001948 return r;
Johannes Bergd2372b32008-10-24 20:32:20 +02001949 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001950
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001951 /* This would make this whole thing pointless */
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08001952 if (!last_request->intersect)
1953 BUG_ON(rd != cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001954
1955 /* update all wiphys now with the new established regulatory domain */
Johannes Bergf6037d02008-10-21 11:01:33 +02001956 update_all_wiphy_regulatory(last_request->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001957
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08001958 print_regdomain(cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001959
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001960 nl80211_send_reg_change_event(last_request);
1961
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001962 mutex_unlock(&reg_mutex);
1963
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001964 return r;
1965}
1966
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001967/* Caller must hold cfg80211_mutex */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001968void reg_device_remove(struct wiphy *wiphy)
1969{
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04001970 struct wiphy *request_wiphy = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001971
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001972 assert_cfg80211_lock();
1973
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001974 mutex_lock(&reg_mutex);
1975
Chris Wright0ef9ccd2009-04-24 14:09:31 -07001976 kfree(wiphy->regd);
1977
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04001978 if (last_request)
1979 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001980
Chris Wright0ef9ccd2009-04-24 14:09:31 -07001981 if (!request_wiphy || request_wiphy != wiphy)
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001982 goto out;
Chris Wright0ef9ccd2009-04-24 14:09:31 -07001983
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001984 last_request->wiphy_idx = WIPHY_IDX_STALE;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001985 last_request->country_ie_env = ENVIRON_ANY;
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001986out:
1987 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001988}
1989
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02001990int __init regulatory_init(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001991{
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05001992 int err = 0;
Johannes Berg734366d2008-09-15 10:56:48 +02001993
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001994 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
1995 if (IS_ERR(reg_pdev))
1996 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02001997
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001998 spin_lock_init(&reg_requests_lock);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001999 spin_lock_init(&reg_pending_beacons_lock);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002000
Johannes Berga3d2eaf2008-09-15 11:10:52 +02002001 cfg80211_regdomain = cfg80211_world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +02002002
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05002003 user_alpha2[0] = '9';
2004 user_alpha2[1] = '7';
2005
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002006 /* We always try to get an update for the static regdomain */
2007 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002008 if (err) {
2009 if (err == -ENOMEM)
2010 return err;
2011 /*
2012 * N.B. kobject_uevent_env() can fail mainly for when we're out
2013 * memory which is handled and propagated appropriately above
2014 * but it can also fail during a netlink_broadcast() or during
2015 * early boot for call_usermodehelper(). For now treat these
2016 * errors as non-fatal.
2017 */
2018 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
2019 "to call CRDA during init");
2020#ifdef CONFIG_CFG80211_REG_DEBUG
2021 /* We want to find out exactly why when debugging */
2022 WARN_ON(err);
2023#endif
2024 }
Johannes Berg734366d2008-09-15 10:56:48 +02002025
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002026 /*
2027 * Finally, if the user set the module parameter treat it
2028 * as a user hint.
2029 */
2030 if (!is_world_regdom(ieee80211_regdom))
2031 regulatory_hint_user(ieee80211_regdom);
2032
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002033 return 0;
2034}
2035
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002036void /* __init_or_exit */ regulatory_exit(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002037{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002038 struct regulatory_request *reg_request, *tmp;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002039 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002040
2041 cancel_work_sync(&reg_work);
2042
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002043 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002044 mutex_lock(&reg_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +02002045
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002046 reset_regdomains();
Johannes Berg734366d2008-09-15 10:56:48 +02002047
Johannes Bergf6037d02008-10-21 11:01:33 +02002048 kfree(last_request);
2049
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002050 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002051
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002052 spin_lock_bh(&reg_pending_beacons_lock);
2053 if (!list_empty(&reg_pending_beacons)) {
2054 list_for_each_entry_safe(reg_beacon, btmp,
2055 &reg_pending_beacons, list) {
2056 list_del(&reg_beacon->list);
2057 kfree(reg_beacon);
2058 }
2059 }
2060 spin_unlock_bh(&reg_pending_beacons_lock);
2061
2062 if (!list_empty(&reg_beacon_list)) {
2063 list_for_each_entry_safe(reg_beacon, btmp,
2064 &reg_beacon_list, list) {
2065 list_del(&reg_beacon->list);
2066 kfree(reg_beacon);
2067 }
2068 }
2069
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002070 spin_lock(&reg_requests_lock);
2071 if (!list_empty(&reg_requests_list)) {
2072 list_for_each_entry_safe(reg_request, tmp,
2073 &reg_requests_list, list) {
2074 list_del(&reg_request->list);
2075 kfree(reg_request);
2076 }
2077 }
2078 spin_unlock(&reg_requests_lock);
2079
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002080 mutex_unlock(&reg_mutex);
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002081 mutex_unlock(&cfg80211_mutex);
Johannes Berg8318d782008-01-24 19:38:38 +01002082}