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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>
39#include <linux/nl80211.h>
40#include <linux/platform_device.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070041#include <net/cfg80211.h>
Johannes Berg8318d782008-01-24 19:38:38 +010042#include "core.h"
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070043#include "reg.h"
John W. Linville3b377ea2009-12-18 17:59:01 -050044#include "regdb.h"
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -040045#include "nl80211.h"
Johannes Berg8318d782008-01-24 19:38:38 +010046
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050047#ifdef CONFIG_CFG80211_REG_DEBUG
John W. Linville82711952010-01-05 17:57:20 -050048#define REG_DBG_PRINT(format, args...) \
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050049 do { \
John W. Linville82711952010-01-05 17:57:20 -050050 printk(KERN_DEBUG format , ## args); \
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050051 } while (0)
52#else
John W. Linville82711952010-01-05 17:57:20 -050053#define REG_DBG_PRINT(args...)
Luis R. Rodriguez4113f752010-01-04 11:50:11 -050054#endif
55
Luis R. Rodriguez5166ccd2008-10-30 13:33:56 -070056/* Receipt of information from last regulatory request */
Johannes Bergf6037d02008-10-21 11:01:33 +020057static struct regulatory_request *last_request;
Johannes Berg734366d2008-09-15 10:56:48 +020058
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070059/* To trigger userspace events */
60static struct platform_device *reg_pdev;
Johannes Berg8318d782008-01-24 19:38:38 +010061
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050062/*
63 * Central wireless core regulatory domains, we only need two,
Johannes Berg734366d2008-09-15 10:56:48 +020064 * the current one and a world regulatory domain in case we have no
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050065 * information to give us an alpha2
66 */
Luis R. Rodriguezf1303472009-01-30 09:26:42 -080067const struct ieee80211_regdomain *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +020068
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050069/*
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070070 * Protects static reg.c components:
71 * - cfg80211_world_regdom
72 * - cfg80211_regdom
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070073 * - last_request
74 */
John W. Linville670b7f12010-06-24 11:26:31 -040075static DEFINE_MUTEX(reg_mutex);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -070076#define assert_reg_lock() WARN_ON(!mutex_is_locked(&reg_mutex))
77
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -050078/* Used to queue up regulatory hints */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -050079static LIST_HEAD(reg_requests_list);
80static spinlock_t reg_requests_lock;
81
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -050082/* Used to queue up beacon hints for review */
83static LIST_HEAD(reg_pending_beacons);
84static spinlock_t reg_pending_beacons_lock;
85
86/* Used to keep track of processed beacon hints */
87static LIST_HEAD(reg_beacon_list);
88
89struct reg_beacon {
90 struct list_head list;
91 struct ieee80211_channel chan;
92};
93
Johannes Berg734366d2008-09-15 10:56:48 +020094/* We keep a static world regulatory domain in case of the absence of CRDA */
95static const struct ieee80211_regdomain world_regdom = {
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -080096 .n_reg_rules = 5,
Johannes Berg734366d2008-09-15 10:56:48 +020097 .alpha2 = "00",
98 .reg_rules = {
Luis R. Rodriguez68798a62009-02-21 00:20:37 -050099 /* IEEE 802.11b/g, channels 1..11 */
100 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800101 /* IEEE 802.11b/g, channels 12..13. No HT40
102 * channel fits here. */
103 REG_RULE(2467-10, 2472+10, 20, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500104 NL80211_RRF_PASSIVE_SCAN |
105 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800106 /* IEEE 802.11 channel 14 - Only JP enables
107 * this and for 802.11b only */
108 REG_RULE(2484-10, 2484+10, 20, 6, 20,
109 NL80211_RRF_PASSIVE_SCAN |
110 NL80211_RRF_NO_IBSS |
111 NL80211_RRF_NO_OFDM),
112 /* IEEE 802.11a, channel 36..48 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800113 REG_RULE(5180-10, 5240+10, 40, 6, 20,
Luis R. Rodriguez611b6a82009-03-05 21:19:21 -0800114 NL80211_RRF_PASSIVE_SCAN |
115 NL80211_RRF_NO_IBSS),
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500116
117 /* NB: 5260 MHz - 5700 MHz requies DFS */
118
119 /* IEEE 802.11a, channel 149..165 */
Luis R. Rodriguezec329ac2009-03-05 21:19:22 -0800120 REG_RULE(5745-10, 5825+10, 40, 6, 20,
Luis R. Rodriguez3fc71f72009-02-21 00:20:38 -0500121 NL80211_RRF_PASSIVE_SCAN |
122 NL80211_RRF_NO_IBSS),
Johannes Berg734366d2008-09-15 10:56:48 +0200123 }
124};
125
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200126static const struct ieee80211_regdomain *cfg80211_world_regdom =
127 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200128
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400129static char *ieee80211_regdom = "00";
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500130static char user_alpha2[2];
Luis R. Rodriguez6ee7d332009-03-20 23:53:06 -0400131
Johannes Berg734366d2008-09-15 10:56:48 +0200132module_param(ieee80211_regdom, charp, 0444);
133MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
134
Johannes Berg734366d2008-09-15 10:56:48 +0200135static void reset_regdomains(void)
136{
Johannes Berg942b25c2008-09-15 11:26:47 +0200137 /* avoid freeing static information or freeing something twice */
138 if (cfg80211_regdomain == cfg80211_world_regdom)
139 cfg80211_regdomain = NULL;
140 if (cfg80211_world_regdom == &world_regdom)
141 cfg80211_world_regdom = NULL;
142 if (cfg80211_regdomain == &world_regdom)
143 cfg80211_regdomain = NULL;
Johannes Berg942b25c2008-09-15 11:26:47 +0200144
145 kfree(cfg80211_regdomain);
146 kfree(cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200147
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200148 cfg80211_world_regdom = &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200149 cfg80211_regdomain = NULL;
150}
151
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500152/*
153 * Dynamic world regulatory domain requested by the wireless
154 * core upon initialization
155 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200156static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200157{
Johannes Bergf6037d02008-10-21 11:01:33 +0200158 BUG_ON(!last_request);
Johannes Berg734366d2008-09-15 10:56:48 +0200159
160 reset_regdomains();
161
162 cfg80211_world_regdom = rd;
163 cfg80211_regdomain = rd;
164}
Johannes Berg734366d2008-09-15 10:56:48 +0200165
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200166bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100167{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700168 if (!alpha2)
169 return false;
170 if (alpha2[0] == '0' && alpha2[1] == '0')
171 return true;
172 return false;
Johannes Berg8318d782008-01-24 19:38:38 +0100173}
174
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200175static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700176{
177 if (!alpha2)
178 return false;
179 if (alpha2[0] != 0 && alpha2[1] != 0)
180 return true;
181 return false;
182}
Johannes Berg8318d782008-01-24 19:38:38 +0100183
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700184static bool is_alpha_upper(char letter)
185{
186 /* ASCII A - Z */
187 if (letter >= 65 && letter <= 90)
188 return true;
189 return false;
190}
191
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200192static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700193{
194 if (!alpha2)
195 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500196 /*
197 * Special case where regulatory domain was built by driver
198 * but a specific alpha2 cannot be determined
199 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700200 if (alpha2[0] == '9' && alpha2[1] == '9')
201 return true;
202 return false;
203}
204
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800205static bool is_intersected_alpha2(const char *alpha2)
206{
207 if (!alpha2)
208 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500209 /*
210 * Special case where regulatory domain is the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800211 * result of an intersection between two regulatory domain
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500212 * structures
213 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800214 if (alpha2[0] == '9' && alpha2[1] == '8')
215 return true;
216 return false;
217}
218
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200219static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700220{
221 if (!alpha2)
222 return false;
223 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
224 return true;
225 return false;
226}
227
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200228static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700229{
230 if (!alpha2_x || !alpha2_y)
231 return false;
232 if (alpha2_x[0] == alpha2_y[0] &&
233 alpha2_x[1] == alpha2_y[1])
234 return true;
235 return false;
236}
237
Luis R. Rodriguez69b15722009-02-21 00:04:33 -0500238static bool regdom_changes(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700239{
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500240 assert_cfg80211_lock();
241
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700242 if (!cfg80211_regdomain)
243 return true;
244 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
245 return false;
246 return true;
247}
248
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -0500249/*
250 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
251 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
252 * has ever been issued.
253 */
254static bool is_user_regdom_saved(void)
255{
256 if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
257 return false;
258
259 /* This would indicate a mistake on the design */
260 if (WARN((!is_world_regdom(user_alpha2) &&
261 !is_an_alpha2(user_alpha2)),
262 "Unexpected user alpha2: %c%c\n",
263 user_alpha2[0],
264 user_alpha2[1]))
265 return false;
266
267 return true;
268}
269
John W. Linville3b377ea2009-12-18 17:59:01 -0500270static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
271 const struct ieee80211_regdomain *src_regd)
272{
273 struct ieee80211_regdomain *regd;
274 int size_of_regd = 0;
275 unsigned int i;
276
277 size_of_regd = sizeof(struct ieee80211_regdomain) +
278 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
279
280 regd = kzalloc(size_of_regd, GFP_KERNEL);
281 if (!regd)
282 return -ENOMEM;
283
284 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
285
286 for (i = 0; i < src_regd->n_reg_rules; i++)
287 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
288 sizeof(struct ieee80211_reg_rule));
289
290 *dst_regd = regd;
291 return 0;
292}
293
294#ifdef CONFIG_CFG80211_INTERNAL_REGDB
295struct reg_regdb_search_request {
296 char alpha2[2];
297 struct list_head list;
298};
299
300static LIST_HEAD(reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400301static DEFINE_MUTEX(reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500302
303static void reg_regdb_search(struct work_struct *work)
304{
305 struct reg_regdb_search_request *request;
306 const struct ieee80211_regdomain *curdom, *regdom;
307 int i, r;
308
John W. Linville368d06f2010-03-16 15:40:59 -0400309 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500310 while (!list_empty(&reg_regdb_search_list)) {
311 request = list_first_entry(&reg_regdb_search_list,
312 struct reg_regdb_search_request,
313 list);
314 list_del(&request->list);
315
316 for (i=0; i<reg_regdb_size; i++) {
317 curdom = reg_regdb[i];
318
319 if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
320 r = reg_copy_regd(&regdom, curdom);
321 if (r)
322 break;
John W. Linville3b377ea2009-12-18 17:59:01 -0500323 mutex_lock(&cfg80211_mutex);
324 set_regdom(regdom);
325 mutex_unlock(&cfg80211_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500326 break;
327 }
328 }
329
330 kfree(request);
331 }
John W. Linville368d06f2010-03-16 15:40:59 -0400332 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500333}
334
335static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
336
337static void reg_regdb_query(const char *alpha2)
338{
339 struct reg_regdb_search_request *request;
340
341 if (!alpha2)
342 return;
343
344 request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
345 if (!request)
346 return;
347
348 memcpy(request->alpha2, alpha2, 2);
349
John W. Linville368d06f2010-03-16 15:40:59 -0400350 mutex_lock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500351 list_add_tail(&request->list, &reg_regdb_search_list);
John W. Linville368d06f2010-03-16 15:40:59 -0400352 mutex_unlock(&reg_regdb_search_mutex);
John W. Linville3b377ea2009-12-18 17:59:01 -0500353
354 schedule_work(&reg_regdb_work);
355}
356#else
357static inline void reg_regdb_query(const char *alpha2) {}
358#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
359
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500360/*
361 * This lets us keep regulatory code which is updated on a regulatory
362 * basis in userspace.
363 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700364static int call_crda(const char *alpha2)
365{
366 char country_env[9 + 2] = "COUNTRY=";
367 char *envp[] = {
368 country_env,
369 NULL
370 };
371
372 if (!is_world_regdom((char *) alpha2))
373 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
374 alpha2[0], alpha2[1]);
375 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700376 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
377 "regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700378
John W. Linville3b377ea2009-12-18 17:59:01 -0500379 /* query internal regulatory database (if it exists) */
380 reg_regdb_query(alpha2);
381
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700382 country_env[8] = alpha2[0];
383 country_env[9] = alpha2[1];
384
385 return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
386}
387
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700388/* Used by nl80211 before kmalloc'ing our regulatory domain */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200389bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700390{
Luis R. Rodriguez61405e92009-05-13 17:04:41 -0400391 assert_cfg80211_lock();
392
Johannes Bergf6037d02008-10-21 11:01:33 +0200393 if (!last_request)
394 return false;
395
396 return alpha2_equal(last_request->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700397}
398
399/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200400static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700401{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200402 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700403 u32 freq_diff;
404
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800405 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700406 return false;
407
408 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
409 return false;
410
411 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
412
Roel Kluinbd05f282009-03-03 22:55:21 +0100413 if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
414 freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700415 return false;
416
417 return true;
418}
419
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200420static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700421{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200422 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700423 unsigned int i;
424
425 if (!rd->n_reg_rules)
426 return false;
427
Luis R. Rodriguez88dc1c32008-11-12 14:22:01 -0800428 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
429 return false;
430
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700431 for (i = 0; i < rd->n_reg_rules; i++) {
432 reg_rule = &rd->reg_rules[i];
433 if (!is_valid_reg_rule(reg_rule))
434 return false;
435 }
436
437 return true;
438}
439
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400440static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
441 u32 center_freq_khz,
442 u32 bw_khz)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700443{
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400444 u32 start_freq_khz, end_freq_khz;
445
446 start_freq_khz = center_freq_khz - (bw_khz/2);
447 end_freq_khz = center_freq_khz + (bw_khz/2);
448
449 if (start_freq_khz >= freq_range->start_freq_khz &&
450 end_freq_khz <= freq_range->end_freq_khz)
451 return true;
452
453 return false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700454}
455
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800456/**
457 * freq_in_rule_band - tells us if a frequency is in a frequency band
458 * @freq_range: frequency rule we want to query
459 * @freq_khz: frequency we are inquiring about
460 *
461 * This lets us know if a specific frequency rule is or is not relevant to
462 * a specific frequency's band. Bands are device specific and artificial
463 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
464 * safe for now to assume that a frequency rule should not be part of a
465 * frequency's band if the start freq or end freq are off by more than 2 GHz.
466 * This resolution can be lowered and should be considered as we add
467 * regulatory rule support for other "bands".
468 **/
469static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
470 u32 freq_khz)
471{
472#define ONE_GHZ_IN_KHZ 1000000
473 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
474 return true;
475 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
476 return true;
477 return false;
478#undef ONE_GHZ_IN_KHZ
479}
480
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500481/*
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500482 * Helper for regdom_intersect(), this does the real
483 * mathematical intersection fun
484 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700485static int reg_rules_intersect(
486 const struct ieee80211_reg_rule *rule1,
487 const struct ieee80211_reg_rule *rule2,
488 struct ieee80211_reg_rule *intersected_rule)
489{
490 const struct ieee80211_freq_range *freq_range1, *freq_range2;
491 struct ieee80211_freq_range *freq_range;
492 const struct ieee80211_power_rule *power_rule1, *power_rule2;
493 struct ieee80211_power_rule *power_rule;
494 u32 freq_diff;
495
496 freq_range1 = &rule1->freq_range;
497 freq_range2 = &rule2->freq_range;
498 freq_range = &intersected_rule->freq_range;
499
500 power_rule1 = &rule1->power_rule;
501 power_rule2 = &rule2->power_rule;
502 power_rule = &intersected_rule->power_rule;
503
504 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
505 freq_range2->start_freq_khz);
506 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
507 freq_range2->end_freq_khz);
508 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
509 freq_range2->max_bandwidth_khz);
510
511 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
512 if (freq_range->max_bandwidth_khz > freq_diff)
513 freq_range->max_bandwidth_khz = freq_diff;
514
515 power_rule->max_eirp = min(power_rule1->max_eirp,
516 power_rule2->max_eirp);
517 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
518 power_rule2->max_antenna_gain);
519
520 intersected_rule->flags = (rule1->flags | rule2->flags);
521
522 if (!is_valid_reg_rule(intersected_rule))
523 return -EINVAL;
524
525 return 0;
526}
527
528/**
529 * regdom_intersect - do the intersection between two regulatory domains
530 * @rd1: first regulatory domain
531 * @rd2: second regulatory domain
532 *
533 * Use this function to get the intersection between two regulatory domains.
534 * Once completed we will mark the alpha2 for the rd as intersected, "98",
535 * as no one single alpha2 can represent this regulatory domain.
536 *
537 * Returns a pointer to the regulatory domain structure which will hold the
538 * resulting intersection of rules between rd1 and rd2. We will
539 * kzalloc() this structure for you.
540 */
541static struct ieee80211_regdomain *regdom_intersect(
542 const struct ieee80211_regdomain *rd1,
543 const struct ieee80211_regdomain *rd2)
544{
545 int r, size_of_regd;
546 unsigned int x, y;
547 unsigned int num_rules = 0, rule_idx = 0;
548 const struct ieee80211_reg_rule *rule1, *rule2;
549 struct ieee80211_reg_rule *intersected_rule;
550 struct ieee80211_regdomain *rd;
551 /* This is just a dummy holder to help us count */
552 struct ieee80211_reg_rule irule;
553
554 /* Uses the stack temporarily for counter arithmetic */
555 intersected_rule = &irule;
556
557 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
558
559 if (!rd1 || !rd2)
560 return NULL;
561
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500562 /*
563 * First we get a count of the rules we'll need, then we actually
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700564 * build them. This is to so we can malloc() and free() a
565 * regdomain once. The reason we use reg_rules_intersect() here
566 * is it will return -EINVAL if the rule computed makes no sense.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500567 * All rules that do check out OK are valid.
568 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700569
570 for (x = 0; x < rd1->n_reg_rules; x++) {
571 rule1 = &rd1->reg_rules[x];
572 for (y = 0; y < rd2->n_reg_rules; y++) {
573 rule2 = &rd2->reg_rules[y];
574 if (!reg_rules_intersect(rule1, rule2,
575 intersected_rule))
576 num_rules++;
577 memset(intersected_rule, 0,
578 sizeof(struct ieee80211_reg_rule));
579 }
580 }
581
582 if (!num_rules)
583 return NULL;
584
585 size_of_regd = sizeof(struct ieee80211_regdomain) +
586 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
587
588 rd = kzalloc(size_of_regd, GFP_KERNEL);
589 if (!rd)
590 return NULL;
591
592 for (x = 0; x < rd1->n_reg_rules; x++) {
593 rule1 = &rd1->reg_rules[x];
594 for (y = 0; y < rd2->n_reg_rules; y++) {
595 rule2 = &rd2->reg_rules[y];
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500596 /*
597 * This time around instead of using the stack lets
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700598 * write to the target rule directly saving ourselves
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500599 * a memcpy()
600 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700601 intersected_rule = &rd->reg_rules[rule_idx];
602 r = reg_rules_intersect(rule1, rule2,
603 intersected_rule);
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500604 /*
605 * No need to memset here the intersected rule here as
606 * we're not using the stack anymore
607 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700608 if (r)
609 continue;
610 rule_idx++;
611 }
612 }
613
614 if (rule_idx != num_rules) {
615 kfree(rd);
616 return NULL;
617 }
618
619 rd->n_reg_rules = num_rules;
620 rd->alpha2[0] = '9';
621 rd->alpha2[1] = '8';
622
623 return rd;
624}
625
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500626/*
627 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
628 * want to just have the channel structure use these
629 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700630static u32 map_regdom_flags(u32 rd_flags)
631{
632 u32 channel_flags = 0;
633 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
634 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
635 if (rd_flags & NL80211_RRF_NO_IBSS)
636 channel_flags |= IEEE80211_CHAN_NO_IBSS;
637 if (rd_flags & NL80211_RRF_DFS)
638 channel_flags |= IEEE80211_CHAN_RADAR;
639 return channel_flags;
640}
641
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800642static int freq_reg_info_regd(struct wiphy *wiphy,
643 u32 center_freq,
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400644 u32 desired_bw_khz,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800645 const struct ieee80211_reg_rule **reg_rule,
646 const struct ieee80211_regdomain *custom_regd)
Johannes Berg8318d782008-01-24 19:38:38 +0100647{
648 int i;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800649 bool band_rule_found = false;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800650 const struct ieee80211_regdomain *regd;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400651 bool bw_fits = false;
652
653 if (!desired_bw_khz)
654 desired_bw_khz = MHZ_TO_KHZ(20);
Johannes Berg8318d782008-01-24 19:38:38 +0100655
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800656 regd = custom_regd ? custom_regd : cfg80211_regdomain;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800657
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500658 /*
659 * Follow the driver's regulatory domain, if present, unless a country
660 * IE has been processed or a user wants to help complaince further
661 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400662 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
663 last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800664 wiphy->regd)
665 regd = wiphy->regd;
666
667 if (!regd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700668 return -EINVAL;
669
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800670 for (i = 0; i < regd->n_reg_rules; i++) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700671 const struct ieee80211_reg_rule *rr;
672 const struct ieee80211_freq_range *fr = NULL;
673 const struct ieee80211_power_rule *pr = NULL;
674
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800675 rr = &regd->reg_rules[i];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700676 fr = &rr->freq_range;
677 pr = &rr->power_rule;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800678
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500679 /*
680 * We only need to know if one frequency rule was
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800681 * was in center_freq's band, that's enough, so lets
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500682 * not overwrite it once found
683 */
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800684 if (!band_rule_found)
685 band_rule_found = freq_in_rule_band(fr, center_freq);
686
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400687 bw_fits = reg_does_bw_fit(fr,
688 center_freq,
689 desired_bw_khz);
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800690
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400691 if (band_rule_found && bw_fits) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700692 *reg_rule = rr;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400693 return 0;
Johannes Berg8318d782008-01-24 19:38:38 +0100694 }
695 }
696
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800697 if (!band_rule_found)
698 return -ERANGE;
699
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400700 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700701}
702
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400703int freq_reg_info(struct wiphy *wiphy,
704 u32 center_freq,
705 u32 desired_bw_khz,
706 const struct ieee80211_reg_rule **reg_rule)
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800707{
Luis R. Rodriguezac46d482009-05-01 18:44:50 -0400708 assert_cfg80211_lock();
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400709 return freq_reg_info_regd(wiphy,
710 center_freq,
711 desired_bw_khz,
712 reg_rule,
713 NULL);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800714}
John W. Linville4f366c52010-07-15 14:57:33 -0400715EXPORT_SYMBOL(freq_reg_info);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700716
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400717/*
718 * Note that right now we assume the desired channel bandwidth
719 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
720 * per channel, the primary and the extension channel). To support
721 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
722 * new ieee80211_channel.target_bw and re run the regulatory check
723 * on the wiphy with the target_bw specified. Then we can simply use
724 * that below for the desired_bw_khz below.
725 */
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800726static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
727 unsigned int chan_idx)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700728{
729 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400730 u32 flags, bw_flags = 0;
731 u32 desired_bw_khz = MHZ_TO_KHZ(20);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700732 const struct ieee80211_reg_rule *reg_rule = NULL;
733 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400734 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800735 struct ieee80211_supported_band *sband;
736 struct ieee80211_channel *chan;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500737 struct wiphy *request_wiphy = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800738
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500739 assert_cfg80211_lock();
740
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500741 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
742
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800743 sband = wiphy->bands[band];
744 BUG_ON(chan_idx >= sband->n_channels);
745 chan = &sband->channels[chan_idx];
746
747 flags = chan->orig_flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700748
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400749 r = freq_reg_info(wiphy,
750 MHZ_TO_KHZ(chan->center_freq),
751 desired_bw_khz,
752 &reg_rule);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700753
John W. Linville4f366c52010-07-15 14:57:33 -0400754 if (r)
Johannes Berg8318d782008-01-24 19:38:38 +0100755 return;
Johannes Berg8318d782008-01-24 19:38:38 +0100756
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700757 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400758 freq_range = &reg_rule->freq_range;
759
760 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
761 bw_flags = IEEE80211_CHAN_NO_HT40;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700762
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400763 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500764 request_wiphy && request_wiphy == wiphy &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100765 request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500766 /*
767 * This gaurantees the driver's requested regulatory domain
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800768 * will always be used as a base for further regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500769 * settings
770 */
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800771 chan->flags = chan->orig_flags =
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400772 map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800773 chan->max_antenna_gain = chan->orig_mag =
774 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800775 chan->max_power = chan->orig_mpwr =
776 (int) MBM_TO_DBM(power_rule->max_eirp);
777 return;
778 }
779
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400780 chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
Johannes Berg8318d782008-01-24 19:38:38 +0100781 chan->max_antenna_gain = min(chan->orig_mag,
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700782 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
John W. Linville253898c2008-04-03 15:32:54 -0400783 if (chan->orig_mpwr)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700784 chan->max_power = min(chan->orig_mpwr,
785 (int) MBM_TO_DBM(power_rule->max_eirp));
John W. Linville253898c2008-04-03 15:32:54 -0400786 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700787 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
Johannes Berg8318d782008-01-24 19:38:38 +0100788}
789
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800790static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
Johannes Berg8318d782008-01-24 19:38:38 +0100791{
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800792 unsigned int i;
793 struct ieee80211_supported_band *sband;
794
795 BUG_ON(!wiphy->bands[band]);
796 sband = wiphy->bands[band];
Johannes Berg8318d782008-01-24 19:38:38 +0100797
798 for (i = 0; i < sband->n_channels; i++)
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800799 handle_channel(wiphy, band, i);
Johannes Berg8318d782008-01-24 19:38:38 +0100800}
801
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400802static bool ignore_reg_update(struct wiphy *wiphy,
803 enum nl80211_reg_initiator initiator)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800804{
805 if (!last_request)
806 return true;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400807 if (initiator == NL80211_REGDOM_SET_BY_CORE &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100808 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800809 return true;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500810 /*
811 * wiphy->regd will be set once the device has its own
812 * desired regulatory domain set
813 */
Johannes Berg5be83de2009-11-19 00:56:28 +0100814 if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800815 !is_world_regdom(last_request->alpha2))
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800816 return true;
817 return false;
818}
819
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -0400820static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700821{
Johannes Berg79c97e92009-07-07 03:56:12 +0200822 struct cfg80211_registered_device *rdev;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700823
Johannes Berg79c97e92009-07-07 03:56:12 +0200824 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
825 wiphy_update_regulatory(&rdev->wiphy, initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700826}
827
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500828static void handle_reg_beacon(struct wiphy *wiphy,
829 unsigned int chan_idx,
830 struct reg_beacon *reg_beacon)
831{
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500832 struct ieee80211_supported_band *sband;
833 struct ieee80211_channel *chan;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400834 bool channel_changed = false;
835 struct ieee80211_channel chan_before;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500836
837 assert_cfg80211_lock();
838
839 sband = wiphy->bands[reg_beacon->chan.band];
840 chan = &sband->channels[chan_idx];
841
842 if (likely(chan->center_freq != reg_beacon->chan.center_freq))
843 return;
844
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400845 if (chan->beacon_found)
846 return;
847
848 chan->beacon_found = true;
849
Johannes Berg5be83de2009-11-19 00:56:28 +0100850 if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700851 return;
852
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400853 chan_before.center_freq = chan->center_freq;
854 chan_before.flags = chan->flags;
855
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700856 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500857 chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400858 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500859 }
860
Luis R. Rodriguez37184242009-07-30 17:43:48 -0700861 if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500862 chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400863 channel_changed = true;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500864 }
865
Luis R. Rodriguez6bad8762009-04-02 14:08:09 -0400866 if (channel_changed)
867 nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500868}
869
870/*
871 * Called when a scan on a wiphy finds a beacon on
872 * new channel
873 */
874static void wiphy_update_new_beacon(struct wiphy *wiphy,
875 struct reg_beacon *reg_beacon)
876{
877 unsigned int i;
878 struct ieee80211_supported_band *sband;
879
880 assert_cfg80211_lock();
881
882 if (!wiphy->bands[reg_beacon->chan.band])
883 return;
884
885 sband = wiphy->bands[reg_beacon->chan.band];
886
887 for (i = 0; i < sband->n_channels; i++)
888 handle_reg_beacon(wiphy, i, reg_beacon);
889}
890
891/*
892 * Called upon reg changes or a new wiphy is added
893 */
894static void wiphy_update_beacon_reg(struct wiphy *wiphy)
895{
896 unsigned int i;
897 struct ieee80211_supported_band *sband;
898 struct reg_beacon *reg_beacon;
899
900 assert_cfg80211_lock();
901
902 if (list_empty(&reg_beacon_list))
903 return;
904
905 list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
906 if (!wiphy->bands[reg_beacon->chan.band])
907 continue;
908 sband = wiphy->bands[reg_beacon->chan.band];
909 for (i = 0; i < sband->n_channels; i++)
910 handle_reg_beacon(wiphy, i, reg_beacon);
911 }
912}
913
914static bool reg_is_world_roaming(struct wiphy *wiphy)
915{
916 if (is_world_regdom(cfg80211_regdomain->alpha2) ||
917 (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
918 return true;
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -0400919 if (last_request &&
920 last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Johannes Berg5be83de2009-11-19 00:56:28 +0100921 wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500922 return true;
923 return false;
924}
925
926/* Reap the advantages of previously found beacons */
927static void reg_process_beacons(struct wiphy *wiphy)
928{
Luis R. Rodriguezb1ed8dd2009-05-02 00:34:15 -0400929 /*
930 * Means we are just firing up cfg80211, so no beacons would
931 * have been processed yet.
932 */
933 if (!last_request)
934 return;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500935 if (!reg_is_world_roaming(wiphy))
936 return;
937 wiphy_update_beacon_reg(wiphy);
938}
939
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400940static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
941{
942 if (!chan)
943 return true;
944 if (chan->flags & IEEE80211_CHAN_DISABLED)
945 return true;
946 /* This would happen when regulatory rules disallow HT40 completely */
947 if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
948 return true;
949 return false;
950}
951
952static void reg_process_ht_flags_channel(struct wiphy *wiphy,
953 enum ieee80211_band band,
954 unsigned int chan_idx)
955{
956 struct ieee80211_supported_band *sband;
957 struct ieee80211_channel *channel;
958 struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
959 unsigned int i;
960
961 assert_cfg80211_lock();
962
963 sband = wiphy->bands[band];
964 BUG_ON(chan_idx >= sband->n_channels);
965 channel = &sband->channels[chan_idx];
966
967 if (is_ht40_not_allowed(channel)) {
968 channel->flags |= IEEE80211_CHAN_NO_HT40;
969 return;
970 }
971
972 /*
973 * We need to ensure the extension channels exist to
974 * be able to use HT40- or HT40+, this finds them (or not)
975 */
976 for (i = 0; i < sband->n_channels; i++) {
977 struct ieee80211_channel *c = &sband->channels[i];
978 if (c->center_freq == (channel->center_freq - 20))
979 channel_before = c;
980 if (c->center_freq == (channel->center_freq + 20))
981 channel_after = c;
982 }
983
984 /*
985 * Please note that this assumes target bandwidth is 20 MHz,
986 * if that ever changes we also need to change the below logic
987 * to include that as well.
988 */
989 if (is_ht40_not_allowed(channel_before))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -0400990 channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400991 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -0400992 channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400993
994 if (is_ht40_not_allowed(channel_after))
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -0400995 channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400996 else
Luis R. Rodriguez689da1b2009-05-02 00:37:18 -0400997 channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -0400998}
999
1000static void reg_process_ht_flags_band(struct wiphy *wiphy,
1001 enum ieee80211_band band)
1002{
1003 unsigned int i;
1004 struct ieee80211_supported_band *sband;
1005
1006 BUG_ON(!wiphy->bands[band]);
1007 sband = wiphy->bands[band];
1008
1009 for (i = 0; i < sband->n_channels; i++)
1010 reg_process_ht_flags_channel(wiphy, band, i);
1011}
1012
1013static void reg_process_ht_flags(struct wiphy *wiphy)
1014{
1015 enum ieee80211_band band;
1016
1017 if (!wiphy)
1018 return;
1019
1020 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1021 if (wiphy->bands[band])
1022 reg_process_ht_flags_band(wiphy, band);
1023 }
1024
1025}
1026
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001027void wiphy_update_regulatory(struct wiphy *wiphy,
1028 enum nl80211_reg_initiator initiator)
Johannes Berg8318d782008-01-24 19:38:38 +01001029{
1030 enum ieee80211_band band;
Luis R. Rodriguezd46e5b12009-01-22 15:05:50 -08001031
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001032 if (ignore_reg_update(wiphy, initiator))
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001033 goto out;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001034 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Johannes Berg8318d782008-01-24 19:38:38 +01001035 if (wiphy->bands[band])
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -08001036 handle_band(wiphy, band);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001037 }
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001038out:
1039 reg_process_beacons(wiphy);
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001040 reg_process_ht_flags(wiphy);
Luis R. Rodriguez560e28e2009-01-07 17:43:32 -08001041 if (wiphy->reg_notifier)
Luis R. Rodriguez716f9392009-01-22 15:05:51 -08001042 wiphy->reg_notifier(wiphy, last_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001043}
1044
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001045static void handle_channel_custom(struct wiphy *wiphy,
1046 enum ieee80211_band band,
1047 unsigned int chan_idx,
1048 const struct ieee80211_regdomain *regd)
1049{
1050 int r;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001051 u32 desired_bw_khz = MHZ_TO_KHZ(20);
1052 u32 bw_flags = 0;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001053 const struct ieee80211_reg_rule *reg_rule = NULL;
1054 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001055 const struct ieee80211_freq_range *freq_range = NULL;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001056 struct ieee80211_supported_band *sband;
1057 struct ieee80211_channel *chan;
1058
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001059 assert_reg_lock();
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001060
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001061 sband = wiphy->bands[band];
1062 BUG_ON(chan_idx >= sband->n_channels);
1063 chan = &sband->channels[chan_idx];
1064
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001065 r = freq_reg_info_regd(wiphy,
1066 MHZ_TO_KHZ(chan->center_freq),
1067 desired_bw_khz,
1068 &reg_rule,
1069 regd);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001070
1071 if (r) {
1072 chan->flags = IEEE80211_CHAN_DISABLED;
1073 return;
1074 }
1075
1076 power_rule = &reg_rule->power_rule;
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001077 freq_range = &reg_rule->freq_range;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001078
Luis R. Rodriguez038659e2009-05-02 00:37:17 -04001079 if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
1080 bw_flags = IEEE80211_CHAN_NO_HT40;
1081
1082 chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001083 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001084 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1085}
1086
1087static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1088 const struct ieee80211_regdomain *regd)
1089{
1090 unsigned int i;
1091 struct ieee80211_supported_band *sband;
1092
1093 BUG_ON(!wiphy->bands[band]);
1094 sband = wiphy->bands[band];
1095
1096 for (i = 0; i < sband->n_channels; i++)
1097 handle_channel_custom(wiphy, band, i, regd);
1098}
1099
1100/* Used by drivers prior to wiphy registration */
1101void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1102 const struct ieee80211_regdomain *regd)
1103{
1104 enum ieee80211_band band;
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001105 unsigned int bands_set = 0;
Luis R. Rodriguezac46d482009-05-01 18:44:50 -04001106
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001107 mutex_lock(&reg_mutex);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001108 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001109 if (!wiphy->bands[band])
1110 continue;
1111 handle_band_custom(wiphy, band, regd);
1112 bands_set++;
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001113 }
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001114 mutex_unlock(&reg_mutex);
Luis R. Rodriguezbbcf3f02009-05-19 17:49:47 -04001115
1116 /*
1117 * no point in calling this if it won't have any effect
1118 * on your device's supportd bands.
1119 */
1120 WARN_ON(!bands_set);
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001121}
1122EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1123
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001124/*
1125 * Return value which can be used by ignore_request() to indicate
1126 * it has been determined we should intersect two regulatory domains
1127 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001128#define REG_INTERSECT 1
1129
Johannes Berg84fa4f42008-10-24 20:32:23 +02001130/* This has the logic which determines when a new request
1131 * should be ignored. */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001132static int ignore_request(struct wiphy *wiphy,
1133 struct regulatory_request *pending_request)
Johannes Berg84fa4f42008-10-24 20:32:23 +02001134{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001135 struct wiphy *last_wiphy = NULL;
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001136
1137 assert_cfg80211_lock();
1138
Johannes Berg84fa4f42008-10-24 20:32:23 +02001139 /* All initial requests are respected */
1140 if (!last_request)
1141 return 0;
1142
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001143 switch (pending_request->initiator) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001144 case NL80211_REGDOM_SET_BY_CORE:
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001145 return 0;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001146 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001147
1148 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1149
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001150 if (unlikely(!is_an_alpha2(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001151 return -EINVAL;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001152 if (last_request->initiator ==
1153 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001154 if (last_wiphy != wiphy) {
Johannes Berg84fa4f42008-10-24 20:32:23 +02001155 /*
1156 * Two cards with two APs claiming different
Thadeu Lima de Souza Cascardo1fe90b02009-08-11 11:18:42 -03001157 * Country IE alpha2s. We could
Johannes Berg84fa4f42008-10-24 20:32:23 +02001158 * intersect them, but that seems unlikely
1159 * to be correct. Reject second one for now.
1160 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001161 if (regdom_changes(pending_request->alpha2))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001162 return -EOPNOTSUPP;
1163 return -EALREADY;
1164 }
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001165 /*
1166 * Two consecutive Country IE hints on the same wiphy.
1167 * This should be picked up early by the driver/stack
1168 */
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001169 if (WARN_ON(regdom_changes(pending_request->alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001170 return 0;
1171 return -EALREADY;
1172 }
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001173 return REG_INTERSECT;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001174 case NL80211_REGDOM_SET_BY_DRIVER:
1175 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001176 if (regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001177 return 0;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001178 return -EALREADY;
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001179 }
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001180
1181 /*
1182 * This would happen if you unplug and plug your card
1183 * back in or if you add a new device for which the previously
1184 * loaded card also agrees on the regulatory domain.
1185 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001186 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001187 !regdom_changes(pending_request->alpha2))
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001188 return -EALREADY;
1189
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001190 return REG_INTERSECT;
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001191 case NL80211_REGDOM_SET_BY_USER:
1192 if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001193 return REG_INTERSECT;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001194 /*
1195 * If the user knows better the user should set the regdom
1196 * to their country before the IE is picked up
1197 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001198 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001199 last_request->intersect)
1200 return -EOPNOTSUPP;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001201 /*
1202 * Process user requests only after previous user/driver/core
1203 * requests have been processed
1204 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001205 if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
1206 last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
1207 last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
Luis R. Rodriguez69b15722009-02-21 00:04:33 -05001208 if (regdom_changes(last_request->alpha2))
Luis R. Rodriguez5eebade2009-01-22 15:05:47 -08001209 return -EAGAIN;
1210 }
1211
John W. Linvillebaeb66f2009-12-18 17:59:02 -05001212 if (!regdom_changes(pending_request->alpha2))
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001213 return -EALREADY;
1214
Johannes Berg84fa4f42008-10-24 20:32:23 +02001215 return 0;
1216 }
1217
1218 return -EINVAL;
1219}
1220
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001221/**
1222 * __regulatory_hint - hint to the wireless core a regulatory domain
1223 * @wiphy: if the hint comes from country information from an AP, this
1224 * is required to be set to the wiphy that received the information
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001225 * @pending_request: the regulatory request currently being processed
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001226 *
1227 * The Wireless subsystem can use this function to hint to the wireless core
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001228 * what it believes should be the current regulatory domain.
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001229 *
1230 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1231 * already been set or other standard error codes.
1232 *
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001233 * Caller must hold &cfg80211_mutex and &reg_mutex
Luis R. Rodriguezd1c96a92009-02-21 00:24:13 -05001234 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001235static int __regulatory_hint(struct wiphy *wiphy,
1236 struct regulatory_request *pending_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001237{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001238 bool intersect = false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001239 int r = 0;
1240
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001241 assert_cfg80211_lock();
1242
Luis R. Rodriguez2f92cd22009-02-21 00:24:16 -05001243 r = ignore_request(wiphy, pending_request);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001244
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001245 if (r == REG_INTERSECT) {
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001246 if (pending_request->initiator ==
1247 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001248 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001249 if (r) {
1250 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001251 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001252 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001253 }
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001254 intersect = true;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001255 } else if (r) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001256 /*
1257 * If the regulatory domain being requested by the
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001258 * driver has already been set just copy it to the
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001259 * wiphy
1260 */
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001261 if (r == -EALREADY &&
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001262 pending_request->initiator ==
1263 NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001264 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001265 if (r) {
1266 kfree(pending_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001267 return r;
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001268 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001269 r = -EALREADY;
1270 goto new_request;
1271 }
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001272 kfree(pending_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001273 return r;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001274 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001275
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001276new_request:
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001277 kfree(last_request);
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001278
1279 last_request = pending_request;
1280 last_request->intersect = intersect;
1281
1282 pending_request = NULL;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001283
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001284 if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
1285 user_alpha2[0] = last_request->alpha2[0];
1286 user_alpha2[1] = last_request->alpha2[1];
1287 }
1288
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001289 /* When r == REG_INTERSECT we do need to call CRDA */
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001290 if (r < 0) {
1291 /*
1292 * Since CRDA will not be called in this case as we already
1293 * have applied the requested regulatory domain before we just
1294 * inform userspace we have processed the request
1295 */
1296 if (r == -EALREADY)
1297 nl80211_send_reg_change_event(last_request);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001298 return r;
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001299 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001300
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001301 return call_crda(last_request->alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001302}
1303
Luis R. Rodriguez30a548c2009-05-02 01:17:27 -04001304/* This processes *all* regulatory hints */
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001305static void reg_process_hint(struct regulatory_request *reg_request)
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001306{
1307 int r = 0;
1308 struct wiphy *wiphy = NULL;
1309
1310 BUG_ON(!reg_request->alpha2);
1311
1312 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001313 mutex_lock(&reg_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001314
1315 if (wiphy_idx_valid(reg_request->wiphy_idx))
1316 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1317
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001318 if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001319 !wiphy) {
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001320 kfree(reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001321 goto out;
1322 }
1323
Luis R. Rodriguez28da32d2009-02-21 00:24:14 -05001324 r = __regulatory_hint(wiphy, reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001325 /* This is required so that the orig_* parameters are saved */
Johannes Berg5be83de2009-11-19 00:56:28 +01001326 if (r == -EALREADY && wiphy &&
1327 wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001328 wiphy_update_regulatory(wiphy, reg_request->initiator);
1329out:
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001330 mutex_unlock(&reg_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001331 mutex_unlock(&cfg80211_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001332}
1333
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001334/* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001335static void reg_process_pending_hints(void)
1336 {
1337 struct regulatory_request *reg_request;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001338
1339 spin_lock(&reg_requests_lock);
1340 while (!list_empty(&reg_requests_list)) {
1341 reg_request = list_first_entry(&reg_requests_list,
1342 struct regulatory_request,
1343 list);
1344 list_del_init(&reg_request->list);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001345
Luis R. Rodriguezd951c1d2009-02-21 00:24:15 -05001346 spin_unlock(&reg_requests_lock);
1347 reg_process_hint(reg_request);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001348 spin_lock(&reg_requests_lock);
1349 }
1350 spin_unlock(&reg_requests_lock);
1351}
1352
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001353/* Processes beacon hints -- this has nothing to do with country IEs */
1354static void reg_process_pending_beacon_hints(void)
1355{
Johannes Berg79c97e92009-07-07 03:56:12 +02001356 struct cfg80211_registered_device *rdev;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001357 struct reg_beacon *pending_beacon, *tmp;
1358
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001359 /*
1360 * No need to hold the reg_mutex here as we just touch wiphys
1361 * and do not read or access regulatory variables.
1362 */
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001363 mutex_lock(&cfg80211_mutex);
1364
1365 /* This goes through the _pending_ beacon list */
1366 spin_lock_bh(&reg_pending_beacons_lock);
1367
1368 if (list_empty(&reg_pending_beacons)) {
1369 spin_unlock_bh(&reg_pending_beacons_lock);
1370 goto out;
1371 }
1372
1373 list_for_each_entry_safe(pending_beacon, tmp,
1374 &reg_pending_beacons, list) {
1375
1376 list_del_init(&pending_beacon->list);
1377
1378 /* Applies the beacon hint to current wiphys */
Johannes Berg79c97e92009-07-07 03:56:12 +02001379 list_for_each_entry(rdev, &cfg80211_rdev_list, list)
1380 wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001381
1382 /* Remembers the beacon hint for new wiphys or reg changes */
1383 list_add_tail(&pending_beacon->list, &reg_beacon_list);
1384 }
1385
1386 spin_unlock_bh(&reg_pending_beacons_lock);
1387out:
1388 mutex_unlock(&cfg80211_mutex);
1389}
1390
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001391static void reg_todo(struct work_struct *work)
1392{
1393 reg_process_pending_hints();
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001394 reg_process_pending_beacon_hints();
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001395}
1396
1397static DECLARE_WORK(reg_work, reg_todo);
1398
1399static void queue_regulatory_request(struct regulatory_request *request)
1400{
1401 spin_lock(&reg_requests_lock);
1402 list_add_tail(&request->list, &reg_requests_list);
1403 spin_unlock(&reg_requests_lock);
1404
1405 schedule_work(&reg_work);
1406}
1407
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001408/*
1409 * Core regulatory hint -- happens during cfg80211_init()
1410 * and when we restore regulatory settings.
1411 */
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001412static int regulatory_hint_core(const char *alpha2)
1413{
1414 struct regulatory_request *request;
1415
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001416 kfree(last_request);
1417 last_request = NULL;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001418
1419 request = kzalloc(sizeof(struct regulatory_request),
1420 GFP_KERNEL);
1421 if (!request)
1422 return -ENOMEM;
1423
1424 request->alpha2[0] = alpha2[0];
1425 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001426 request->initiator = NL80211_REGDOM_SET_BY_CORE;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001427
Luis R. Rodriguez5078b2e2009-05-13 17:04:42 -04001428 /*
1429 * This ensures last_request is populated once modules
1430 * come swinging in and calling regulatory hints and
1431 * wiphy_apply_custom_regulatory().
1432 */
Luis R. Rodrigueza2bff262010-01-29 19:58:56 -05001433 reg_process_hint(request);
Luis R. Rodriguez5078b2e2009-05-13 17:04:42 -04001434
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001435 return 0;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001436}
1437
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001438/* User hints */
1439int regulatory_hint_user(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001440{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001441 struct regulatory_request *request;
1442
Johannes Bergbe3d4812008-10-24 20:32:21 +02001443 BUG_ON(!alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001444
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001445 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1446 if (!request)
1447 return -ENOMEM;
1448
1449 request->wiphy_idx = WIPHY_IDX_STALE;
1450 request->alpha2[0] = alpha2[0];
1451 request->alpha2[1] = alpha2[1];
Luis R. Rodrigueze12822e2010-01-04 11:37:39 -05001452 request->initiator = NL80211_REGDOM_SET_BY_USER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001453
1454 queue_regulatory_request(request);
1455
1456 return 0;
1457}
1458
1459/* Driver hints */
1460int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1461{
1462 struct regulatory_request *request;
1463
1464 BUG_ON(!alpha2);
1465 BUG_ON(!wiphy);
1466
1467 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1468 if (!request)
1469 return -ENOMEM;
1470
1471 request->wiphy_idx = get_wiphy_idx(wiphy);
1472
1473 /* Must have registered wiphy first */
1474 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1475
1476 request->alpha2[0] = alpha2[0];
1477 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001478 request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001479
1480 queue_regulatory_request(request);
1481
1482 return 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001483}
1484EXPORT_SYMBOL(regulatory_hint);
1485
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001486/*
1487 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1488 * therefore cannot iterate over the rdev list here.
1489 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001490void regulatory_hint_11d(struct wiphy *wiphy,
Luis R. Rodriguez84920e32010-01-14 20:08:20 -05001491 enum ieee80211_band band,
1492 u8 *country_ie,
1493 u8 country_ie_len)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001494{
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001495 char alpha2[2];
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001496 enum environment_cap env = ENVIRON_ANY;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001497 struct regulatory_request *request;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001498
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001499 mutex_lock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001500
Luis R. Rodriguez9828b012009-07-30 17:38:06 -07001501 if (unlikely(!last_request))
1502 goto out;
Luis R. Rodriguezd335fe62009-02-21 00:04:27 -05001503
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001504 /* IE len must be evenly divisible by 2 */
1505 if (country_ie_len & 0x01)
1506 goto out;
1507
1508 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1509 goto out;
1510
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001511 alpha2[0] = country_ie[0];
1512 alpha2[1] = country_ie[1];
1513
1514 if (country_ie[2] == 'I')
1515 env = ENVIRON_INDOOR;
1516 else if (country_ie[2] == 'O')
1517 env = ENVIRON_OUTDOOR;
1518
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001519 /*
Luis R. Rodriguez8b19e6c2009-07-30 17:38:09 -07001520 * We will run this only upon a successful connection on cfg80211.
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001521 * We leave conflict resolution to the workqueue, where can hold
1522 * cfg80211_mutex.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001523 */
Luis R. Rodriguezcc0b6fe2009-03-20 23:53:05 -04001524 if (likely(last_request->initiator ==
1525 NL80211_REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez4b44c8b2009-07-30 17:38:07 -07001526 wiphy_idx_valid(last_request->wiphy_idx)))
1527 goto out;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001528
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001529 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1530 if (!request)
Dan Carpenterf9f9b6e2010-07-22 13:26:50 +02001531 goto out;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001532
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001533 request->wiphy_idx = get_wiphy_idx(wiphy);
John W. Linville4f366c52010-07-15 14:57:33 -04001534 request->alpha2[0] = alpha2[0];
1535 request->alpha2[1] = alpha2[1];
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001536 request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001537 request->country_ie_env = env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001538
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001539 mutex_unlock(&reg_mutex);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001540
1541 queue_regulatory_request(request);
1542
1543 return;
Luis R. Rodriguez0441d6f2009-02-21 00:04:29 -05001544
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001545out:
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001546 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001547}
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001548
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05001549static void restore_alpha2(char *alpha2, bool reset_user)
1550{
1551 /* indicates there is no alpha2 to consider for restoration */
1552 alpha2[0] = '9';
1553 alpha2[1] = '7';
1554
1555 /* The user setting has precedence over the module parameter */
1556 if (is_user_regdom_saved()) {
1557 /* Unless we're asked to ignore it and reset it */
1558 if (reset_user) {
1559 REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
1560 "including user preference\n");
1561 user_alpha2[0] = '9';
1562 user_alpha2[1] = '7';
1563
1564 /*
1565 * If we're ignoring user settings, we still need to
1566 * check the module parameter to ensure we put things
1567 * back as they were for a full restore.
1568 */
1569 if (!is_world_regdom(ieee80211_regdom)) {
1570 REG_DBG_PRINT("cfg80211: Keeping preference on "
1571 "module parameter ieee80211_regdom: %c%c\n",
1572 ieee80211_regdom[0],
1573 ieee80211_regdom[1]);
1574 alpha2[0] = ieee80211_regdom[0];
1575 alpha2[1] = ieee80211_regdom[1];
1576 }
1577 } else {
1578 REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
1579 "while preserving user preference for: %c%c\n",
1580 user_alpha2[0],
1581 user_alpha2[1]);
1582 alpha2[0] = user_alpha2[0];
1583 alpha2[1] = user_alpha2[1];
1584 }
1585 } else if (!is_world_regdom(ieee80211_regdom)) {
1586 REG_DBG_PRINT("cfg80211: Keeping preference on "
1587 "module parameter ieee80211_regdom: %c%c\n",
1588 ieee80211_regdom[0],
1589 ieee80211_regdom[1]);
1590 alpha2[0] = ieee80211_regdom[0];
1591 alpha2[1] = ieee80211_regdom[1];
1592 } else
1593 REG_DBG_PRINT("cfg80211: Restoring regulatory settings\n");
1594}
1595
1596/*
1597 * Restoring regulatory settings involves ingoring any
1598 * possibly stale country IE information and user regulatory
1599 * settings if so desired, this includes any beacon hints
1600 * learned as we could have traveled outside to another country
1601 * after disconnection. To restore regulatory settings we do
1602 * exactly what we did at bootup:
1603 *
1604 * - send a core regulatory hint
1605 * - send a user regulatory hint if applicable
1606 *
1607 * Device drivers that send a regulatory hint for a specific country
1608 * keep their own regulatory domain on wiphy->regd so that does does
1609 * not need to be remembered.
1610 */
1611static void restore_regulatory_settings(bool reset_user)
1612{
1613 char alpha2[2];
1614 struct reg_beacon *reg_beacon, *btmp;
1615
1616 mutex_lock(&cfg80211_mutex);
1617 mutex_lock(&reg_mutex);
1618
1619 reset_regdomains();
1620 restore_alpha2(alpha2, reset_user);
1621
1622 /* Clear beacon hints */
1623 spin_lock_bh(&reg_pending_beacons_lock);
1624 if (!list_empty(&reg_pending_beacons)) {
1625 list_for_each_entry_safe(reg_beacon, btmp,
1626 &reg_pending_beacons, list) {
1627 list_del(&reg_beacon->list);
1628 kfree(reg_beacon);
1629 }
1630 }
1631 spin_unlock_bh(&reg_pending_beacons_lock);
1632
1633 if (!list_empty(&reg_beacon_list)) {
1634 list_for_each_entry_safe(reg_beacon, btmp,
1635 &reg_beacon_list, list) {
1636 list_del(&reg_beacon->list);
1637 kfree(reg_beacon);
1638 }
1639 }
1640
1641 /* First restore to the basic regulatory settings */
1642 cfg80211_regdomain = cfg80211_world_regdom;
1643
1644 mutex_unlock(&reg_mutex);
1645 mutex_unlock(&cfg80211_mutex);
1646
1647 regulatory_hint_core(cfg80211_regdomain->alpha2);
1648
1649 /*
1650 * This restores the ieee80211_regdom module parameter
1651 * preference or the last user requested regulatory
1652 * settings, user regulatory settings takes precedence.
1653 */
1654 if (is_an_alpha2(alpha2))
1655 regulatory_hint_user(user_alpha2);
1656}
1657
1658
1659void regulatory_hint_disconnect(void)
1660{
1661 REG_DBG_PRINT("cfg80211: All devices are disconnected, going to "
1662 "restore regulatory settings\n");
1663 restore_regulatory_settings(false);
1664}
1665
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001666static bool freq_is_chan_12_13_14(u16 freq)
1667{
1668 if (freq == ieee80211_channel_to_frequency(12) ||
1669 freq == ieee80211_channel_to_frequency(13) ||
1670 freq == ieee80211_channel_to_frequency(14))
1671 return true;
1672 return false;
1673}
1674
1675int regulatory_hint_found_beacon(struct wiphy *wiphy,
1676 struct ieee80211_channel *beacon_chan,
1677 gfp_t gfp)
1678{
1679 struct reg_beacon *reg_beacon;
1680
1681 if (likely((beacon_chan->beacon_found ||
1682 (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
1683 (beacon_chan->band == IEEE80211_BAND_2GHZ &&
1684 !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
1685 return 0;
1686
1687 reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
1688 if (!reg_beacon)
1689 return -ENOMEM;
1690
Luis R. Rodriguez4113f752010-01-04 11:50:11 -05001691 REG_DBG_PRINT("cfg80211: Found new beacon on "
1692 "frequency: %d MHz (Ch %d) on %s\n",
1693 beacon_chan->center_freq,
1694 ieee80211_frequency_to_channel(beacon_chan->center_freq),
1695 wiphy_name(wiphy));
1696
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001697 memcpy(&reg_beacon->chan, beacon_chan,
1698 sizeof(struct ieee80211_channel));
1699
1700
1701 /*
1702 * Since we can be called from BH or and non-BH context
1703 * we must use spin_lock_bh()
1704 */
1705 spin_lock_bh(&reg_pending_beacons_lock);
1706 list_add_tail(&reg_beacon->list, &reg_pending_beacons);
1707 spin_unlock_bh(&reg_pending_beacons_lock);
1708
1709 schedule_work(&reg_work);
1710
1711 return 0;
1712}
1713
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001714static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001715{
1716 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001717 const struct ieee80211_reg_rule *reg_rule = NULL;
1718 const struct ieee80211_freq_range *freq_range = NULL;
1719 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001720
Kalle Valo269ac5f2009-12-01 10:47:15 +02001721 printk(KERN_INFO " (start_freq - end_freq @ bandwidth), "
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001722 "(max_antenna_gain, max_eirp)\n");
1723
1724 for (i = 0; i < rd->n_reg_rules; i++) {
1725 reg_rule = &rd->reg_rules[i];
1726 freq_range = &reg_rule->freq_range;
1727 power_rule = &reg_rule->power_rule;
1728
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001729 /*
1730 * There may not be documentation for max antenna gain
1731 * in certain regions
1732 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001733 if (power_rule->max_antenna_gain)
Kalle Valo269ac5f2009-12-01 10:47:15 +02001734 printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), "
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001735 "(%d mBi, %d mBm)\n",
1736 freq_range->start_freq_khz,
1737 freq_range->end_freq_khz,
1738 freq_range->max_bandwidth_khz,
1739 power_rule->max_antenna_gain,
1740 power_rule->max_eirp);
1741 else
Kalle Valo269ac5f2009-12-01 10:47:15 +02001742 printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), "
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001743 "(N/A, %d mBm)\n",
1744 freq_range->start_freq_khz,
1745 freq_range->end_freq_khz,
1746 freq_range->max_bandwidth_khz,
1747 power_rule->max_eirp);
1748 }
1749}
1750
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001751static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001752{
1753
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001754 if (is_intersected_alpha2(rd->alpha2)) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001755
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001756 if (last_request->initiator ==
1757 NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Johannes Berg79c97e92009-07-07 03:56:12 +02001758 struct cfg80211_registered_device *rdev;
1759 rdev = cfg80211_rdev_by_wiphy_idx(
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001760 last_request->wiphy_idx);
Johannes Berg79c97e92009-07-07 03:56:12 +02001761 if (rdev) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001762 printk(KERN_INFO "cfg80211: Current regulatory "
1763 "domain updated by AP to: %c%c\n",
Johannes Berg79c97e92009-07-07 03:56:12 +02001764 rdev->country_ie_alpha2[0],
1765 rdev->country_ie_alpha2[1]);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001766 } else
1767 printk(KERN_INFO "cfg80211: Current regulatory "
Frans Pop55f98932010-03-24 19:46:29 +01001768 "domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001769 } else
Frans Pop55f98932010-03-24 19:46:29 +01001770 printk(KERN_INFO "cfg80211: Current regulatory "
1771 "domain intersected:\n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001772 } else if (is_world_regdom(rd->alpha2))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001773 printk(KERN_INFO "cfg80211: World regulatory "
1774 "domain updated:\n");
1775 else {
1776 if (is_unknown_alpha2(rd->alpha2))
1777 printk(KERN_INFO "cfg80211: Regulatory domain "
1778 "changed to driver built-in settings "
1779 "(unknown country)\n");
1780 else
1781 printk(KERN_INFO "cfg80211: Regulatory domain "
1782 "changed to country: %c%c\n",
1783 rd->alpha2[0], rd->alpha2[1]);
1784 }
1785 print_rd_rules(rd);
1786}
1787
Johannes Berg2df78162008-10-28 16:49:41 +01001788static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001789{
1790 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1791 rd->alpha2[0], rd->alpha2[1]);
1792 print_rd_rules(rd);
1793}
1794
Johannes Bergd2372b32008-10-24 20:32:20 +02001795/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001796static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001797{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001798 const struct ieee80211_regdomain *intersected_rd = NULL;
Johannes Berg79c97e92009-07-07 03:56:12 +02001799 struct cfg80211_registered_device *rdev = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001800 struct wiphy *request_wiphy;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001801 /* Some basic sanity checks first */
1802
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001803 if (is_world_regdom(rd->alpha2)) {
Johannes Bergf6037d02008-10-21 11:01:33 +02001804 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001805 return -EINVAL;
1806 update_world_regdomain(rd);
1807 return 0;
1808 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001809
1810 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1811 !is_unknown_alpha2(rd->alpha2))
1812 return -EINVAL;
1813
Johannes Bergf6037d02008-10-21 11:01:33 +02001814 if (!last_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001815 return -EINVAL;
1816
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001817 /*
1818 * Lets only bother proceeding on the same alpha2 if the current
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001819 * rd is non static (it means CRDA was present and was used last)
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001820 * and the pending request came in from a country IE
1821 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001822 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001823 /*
1824 * If someone else asked us to change the rd lets only bother
1825 * checking if the alpha2 changes if CRDA was already called
1826 */
John W. Linvillebaeb66f2009-12-18 17:59:02 -05001827 if (!regdom_changes(rd->alpha2))
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001828 return -EINVAL;
1829 }
1830
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001831 /*
1832 * Now lets set the regulatory domain, update all driver channels
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001833 * and finally inform them of what we have done, in case they want
1834 * to review or adjust their own settings based on their own
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001835 * internal EEPROM data
1836 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001837
Johannes Bergf6037d02008-10-21 11:01:33 +02001838 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001839 return -EINVAL;
1840
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08001841 if (!is_valid_rd(rd)) {
1842 printk(KERN_ERR "cfg80211: Invalid "
1843 "regulatory domain detected:\n");
1844 print_regdomain_info(rd);
1845 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001846 }
1847
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001848 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1849
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001850 if (!last_request->intersect) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001851 int r;
1852
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001853 if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001854 reset_regdomains();
1855 cfg80211_regdomain = rd;
1856 return 0;
1857 }
1858
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001859 /*
1860 * For a driver hint, lets copy the regulatory domain the
1861 * driver wanted to the wiphy to deal with conflicts
1862 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001863
Luis R. Rodriguez558f6d32009-06-08 18:54:37 -07001864 /*
1865 * Userspace could have sent two replies with only
1866 * one kernel request.
1867 */
1868 if (request_wiphy->regd)
1869 return -EALREADY;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001870
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001871 r = reg_copy_regd(&request_wiphy->regd, rd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001872 if (r)
1873 return r;
1874
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001875 reset_regdomains();
1876 cfg80211_regdomain = rd;
1877 return 0;
1878 }
1879
1880 /* Intersection requires a bit more work */
1881
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001882 if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001883
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001884 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1885 if (!intersected_rd)
1886 return -EINVAL;
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001887
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001888 /*
1889 * We can trash what CRDA provided now.
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001890 * However if a driver requested this specific regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001891 * domain we keep it for its private use
1892 */
Luis R. Rodriguez7db90f42009-03-09 22:07:41 -04001893 if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001894 request_wiphy->regd = rd;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001895 else
1896 kfree(rd);
1897
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001898 rd = NULL;
1899
1900 reset_regdomains();
1901 cfg80211_regdomain = intersected_rd;
1902
1903 return 0;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001904 }
1905
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001906 if (!intersected_rd)
1907 return -EINVAL;
1908
Johannes Berg79c97e92009-07-07 03:56:12 +02001909 rdev = wiphy_to_dev(request_wiphy);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001910
Johannes Berg79c97e92009-07-07 03:56:12 +02001911 rdev->country_ie_alpha2[0] = rd->alpha2[0];
1912 rdev->country_ie_alpha2[1] = rd->alpha2[1];
1913 rdev->env = last_request->country_ie_env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001914
1915 BUG_ON(intersected_rd == rd);
1916
1917 kfree(rd);
1918 rd = NULL;
1919
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001920 reset_regdomains();
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001921 cfg80211_regdomain = intersected_rd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001922
1923 return 0;
1924}
1925
1926
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001927/*
1928 * Use this call to set the current regulatory domain. Conflicts with
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001929 * multiple drivers can be ironed out later. Caller must've already
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001930 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
1931 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001932int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001933{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001934 int r;
1935
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001936 assert_cfg80211_lock();
1937
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001938 mutex_lock(&reg_mutex);
1939
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001940 /* Note that this doesn't update the wiphys, this is done below */
1941 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +02001942 if (r) {
1943 kfree(rd);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001944 mutex_unlock(&reg_mutex);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001945 return r;
Johannes Bergd2372b32008-10-24 20:32:20 +02001946 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001947
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001948 /* This would make this whole thing pointless */
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08001949 if (!last_request->intersect)
1950 BUG_ON(rd != cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001951
1952 /* update all wiphys now with the new established regulatory domain */
Johannes Bergf6037d02008-10-21 11:01:33 +02001953 update_all_wiphy_regulatory(last_request->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001954
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08001955 print_regdomain(cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001956
Luis R. Rodriguez73d54c92009-03-09 22:07:42 -04001957 nl80211_send_reg_change_event(last_request);
1958
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001959 mutex_unlock(&reg_mutex);
1960
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001961 return r;
1962}
1963
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001964/* Caller must hold cfg80211_mutex */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001965void reg_device_remove(struct wiphy *wiphy)
1966{
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04001967 struct wiphy *request_wiphy = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001968
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001969 assert_cfg80211_lock();
1970
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001971 mutex_lock(&reg_mutex);
1972
Chris Wright0ef9ccd2009-04-24 14:09:31 -07001973 kfree(wiphy->regd);
1974
Luis R. Rodriguez0ad8aca2009-03-24 21:21:08 -04001975 if (last_request)
1976 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001977
Chris Wright0ef9ccd2009-04-24 14:09:31 -07001978 if (!request_wiphy || request_wiphy != wiphy)
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001979 goto out;
Chris Wright0ef9ccd2009-04-24 14:09:31 -07001980
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001981 last_request->wiphy_idx = WIPHY_IDX_STALE;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001982 last_request->country_ie_env = ENVIRON_ANY;
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07001983out:
1984 mutex_unlock(&reg_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001985}
1986
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02001987int __init regulatory_init(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001988{
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05001989 int err = 0;
Johannes Berg734366d2008-09-15 10:56:48 +02001990
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001991 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
1992 if (IS_ERR(reg_pdev))
1993 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02001994
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001995 spin_lock_init(&reg_requests_lock);
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001996 spin_lock_init(&reg_pending_beacons_lock);
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001997
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001998 cfg80211_regdomain = cfg80211_world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +02001999
Luis R. Rodriguez09d989d2010-01-29 19:58:57 -05002000 user_alpha2[0] = '9';
2001 user_alpha2[1] = '7';
2002
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002003 /* We always try to get an update for the static regdomain */
2004 err = regulatory_hint_core(cfg80211_regdomain->alpha2);
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05002005 if (err) {
2006 if (err == -ENOMEM)
2007 return err;
2008 /*
2009 * N.B. kobject_uevent_env() can fail mainly for when we're out
2010 * memory which is handled and propagated appropriately above
2011 * but it can also fail during a netlink_broadcast() or during
2012 * early boot for call_usermodehelper(). For now treat these
2013 * errors as non-fatal.
2014 */
2015 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
2016 "to call CRDA during init");
2017#ifdef CONFIG_CFG80211_REG_DEBUG
2018 /* We want to find out exactly why when debugging */
2019 WARN_ON(err);
2020#endif
2021 }
Johannes Berg734366d2008-09-15 10:56:48 +02002022
Luis R. Rodriguezae9e4b02009-07-14 20:23:15 -04002023 /*
2024 * Finally, if the user set the module parameter treat it
2025 * as a user hint.
2026 */
2027 if (!is_world_regdom(ieee80211_regdom))
2028 regulatory_hint_user(ieee80211_regdom);
2029
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002030 return 0;
2031}
2032
Uwe Kleine-König2fcc9f72010-06-18 09:38:55 +02002033void /* __init_or_exit */ regulatory_exit(void)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002034{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002035 struct regulatory_request *reg_request, *tmp;
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002036 struct reg_beacon *reg_beacon, *btmp;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002037
2038 cancel_work_sync(&reg_work);
2039
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002040 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002041 mutex_lock(&reg_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +02002042
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002043 reset_regdomains();
Johannes Berg734366d2008-09-15 10:56:48 +02002044
Johannes Bergf6037d02008-10-21 11:01:33 +02002045 kfree(last_request);
2046
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07002047 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02002048
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05002049 spin_lock_bh(&reg_pending_beacons_lock);
2050 if (!list_empty(&reg_pending_beacons)) {
2051 list_for_each_entry_safe(reg_beacon, btmp,
2052 &reg_pending_beacons, list) {
2053 list_del(&reg_beacon->list);
2054 kfree(reg_beacon);
2055 }
2056 }
2057 spin_unlock_bh(&reg_pending_beacons_lock);
2058
2059 if (!list_empty(&reg_beacon_list)) {
2060 list_for_each_entry_safe(reg_beacon, btmp,
2061 &reg_beacon_list, list) {
2062 list_del(&reg_beacon->list);
2063 kfree(reg_beacon);
2064 }
2065 }
2066
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05002067 spin_lock(&reg_requests_lock);
2068 if (!list_empty(&reg_requests_list)) {
2069 list_for_each_entry_safe(reg_request, tmp,
2070 &reg_requests_list, list) {
2071 list_del(&reg_request->list);
2072 kfree(reg_request);
2073 }
2074 }
2075 spin_unlock(&reg_requests_lock);
2076
Luis R. Rodriguezabc73812009-07-30 17:38:08 -07002077 mutex_unlock(&reg_mutex);
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05002078 mutex_unlock(&cfg80211_mutex);
Johannes Berg8318d782008-01-24 19:38:38 +01002079}