blob: 5456534bdf8cc5f37ae1f808acc489fa2e7fbbe7 [file] [log] [blame]
Johannes Berg8318d782008-01-24 19:38:38 +01001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07005 * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com>
Johannes Berg8318d782008-01-24 19:38:38 +01006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070012/**
13 * DOC: Wireless regulatory infrastructure
Johannes Berg8318d782008-01-24 19:38:38 +010014 *
15 * The usual implementation is for a driver to read a device EEPROM to
16 * determine which regulatory domain it should be operating under, then
17 * looking up the allowable channels in a driver-local table and finally
18 * registering those channels in the wiphy structure.
19 *
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070020 * Another set of compliance enforcement is for drivers to use their
21 * own compliance limits which can be stored on the EEPROM. The host
22 * driver or firmware may ensure these are used.
23 *
24 * In addition to all this we provide an extra layer of regulatory
25 * conformance. For drivers which do not have any regulatory
26 * information CRDA provides the complete regulatory solution.
27 * For others it provides a community effort on further restrictions
28 * to enhance compliance.
29 *
30 * Note: When number of rules --> infinity we will not be able to
31 * index on alpha2 any more, instead we'll probably have to
32 * rely on some SHA1 checksum of the regdomain for example.
33 *
Johannes Berg8318d782008-01-24 19:38:38 +010034 */
35#include <linux/kernel.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070036#include <linux/list.h>
37#include <linux/random.h>
38#include <linux/nl80211.h>
39#include <linux/platform_device.h>
Johannes Berg8318d782008-01-24 19:38:38 +010040#include <net/wireless.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"
Johannes Berg8318d782008-01-24 19:38:38 +010044
Luis R. Rodriguez5166ccd2008-10-30 13:33:56 -070045/* Receipt of information from last regulatory request */
Johannes Bergf6037d02008-10-21 11:01:33 +020046static struct regulatory_request *last_request;
Johannes Berg734366d2008-09-15 10:56:48 +020047
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070048/* To trigger userspace events */
49static struct platform_device *reg_pdev;
Johannes Berg8318d782008-01-24 19:38:38 +010050
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070051/* Keep the ordering from large to small */
52static u32 supported_bandwidths[] = {
53 MHZ_TO_KHZ(40),
54 MHZ_TO_KHZ(20),
Johannes Berg8318d782008-01-24 19:38:38 +010055};
56
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050057/*
58 * Central wireless core regulatory domains, we only need two,
Johannes Berg734366d2008-09-15 10:56:48 +020059 * the current one and a world regulatory domain in case we have no
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050060 * information to give us an alpha2
61 */
Luis R. Rodriguezf1303472009-01-30 09:26:42 -080062const struct ieee80211_regdomain *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +020063
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050064/*
65 * We use this as a place for the rd structure built from the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -080066 * last parsed country IE to rest until CRDA gets back to us with
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050067 * what it thinks should apply for the same country
68 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -080069static const struct ieee80211_regdomain *country_ie_regdomain;
70
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -050071static LIST_HEAD(reg_requests_list);
72static spinlock_t reg_requests_lock;
73
Johannes Berg734366d2008-09-15 10:56:48 +020074/* We keep a static world regulatory domain in case of the absence of CRDA */
75static const struct ieee80211_regdomain world_regdom = {
76 .n_reg_rules = 1,
77 .alpha2 = "00",
78 .reg_rules = {
79 REG_RULE(2412-10, 2462+10, 40, 6, 20,
80 NL80211_RRF_PASSIVE_SCAN |
81 NL80211_RRF_NO_IBSS),
82 }
83};
84
Johannes Berga3d2eaf2008-09-15 11:10:52 +020085static const struct ieee80211_regdomain *cfg80211_world_regdom =
86 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +020087
88#ifdef CONFIG_WIRELESS_OLD_REGULATORY
89static char *ieee80211_regdom = "US";
90module_param(ieee80211_regdom, charp, 0444);
91MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
92
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050093/*
94 * We assume 40 MHz bandwidth for the old regulatory work.
Johannes Berg734366d2008-09-15 10:56:48 +020095 * We make emphasis we are using the exact same frequencies
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -050096 * as before
97 */
Johannes Berg734366d2008-09-15 10:56:48 +020098
99static const struct ieee80211_regdomain us_regdom = {
100 .n_reg_rules = 6,
101 .alpha2 = "US",
102 .reg_rules = {
103 /* IEEE 802.11b/g, channels 1..11 */
104 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
105 /* IEEE 802.11a, channel 36 */
106 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
107 /* IEEE 802.11a, channel 40 */
108 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
109 /* IEEE 802.11a, channel 44 */
110 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
111 /* IEEE 802.11a, channels 48..64 */
112 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
113 /* IEEE 802.11a, channels 149..165, outdoor */
114 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
115 }
116};
117
118static const struct ieee80211_regdomain jp_regdom = {
119 .n_reg_rules = 3,
120 .alpha2 = "JP",
121 .reg_rules = {
122 /* IEEE 802.11b/g, channels 1..14 */
123 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
124 /* IEEE 802.11a, channels 34..48 */
125 REG_RULE(5170-10, 5240+10, 40, 6, 20,
126 NL80211_RRF_PASSIVE_SCAN),
127 /* IEEE 802.11a, channels 52..64 */
128 REG_RULE(5260-10, 5320+10, 40, 6, 20,
129 NL80211_RRF_NO_IBSS |
130 NL80211_RRF_DFS),
131 }
132};
133
134static const struct ieee80211_regdomain eu_regdom = {
135 .n_reg_rules = 6,
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500136 /*
137 * This alpha2 is bogus, we leave it here just for stupid
138 * backward compatibility
139 */
Johannes Berg734366d2008-09-15 10:56:48 +0200140 .alpha2 = "EU",
141 .reg_rules = {
142 /* IEEE 802.11b/g, channels 1..13 */
143 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
144 /* IEEE 802.11a, channel 36 */
145 REG_RULE(5180-10, 5180+10, 40, 6, 23,
146 NL80211_RRF_PASSIVE_SCAN),
147 /* IEEE 802.11a, channel 40 */
148 REG_RULE(5200-10, 5200+10, 40, 6, 23,
149 NL80211_RRF_PASSIVE_SCAN),
150 /* IEEE 802.11a, channel 44 */
151 REG_RULE(5220-10, 5220+10, 40, 6, 23,
152 NL80211_RRF_PASSIVE_SCAN),
153 /* IEEE 802.11a, channels 48..64 */
154 REG_RULE(5240-10, 5320+10, 40, 6, 20,
155 NL80211_RRF_NO_IBSS |
156 NL80211_RRF_DFS),
157 /* IEEE 802.11a, channels 100..140 */
158 REG_RULE(5500-10, 5700+10, 40, 6, 30,
159 NL80211_RRF_NO_IBSS |
160 NL80211_RRF_DFS),
161 }
162};
163
164static const struct ieee80211_regdomain *static_regdom(char *alpha2)
165{
166 if (alpha2[0] == 'U' && alpha2[1] == 'S')
167 return &us_regdom;
168 if (alpha2[0] == 'J' && alpha2[1] == 'P')
169 return &jp_regdom;
170 if (alpha2[0] == 'E' && alpha2[1] == 'U')
171 return &eu_regdom;
172 /* Default, as per the old rules */
173 return &us_regdom;
174}
175
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200176static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200177{
178 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
179 return true;
180 return false;
181}
Johannes Berg734366d2008-09-15 10:56:48 +0200182#else
Johannes Berg942b25c2008-09-15 11:26:47 +0200183static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
184{
185 return false;
186}
187#endif
188
Johannes Berg734366d2008-09-15 10:56:48 +0200189static void reset_regdomains(void)
190{
Johannes Berg942b25c2008-09-15 11:26:47 +0200191 /* avoid freeing static information or freeing something twice */
192 if (cfg80211_regdomain == cfg80211_world_regdom)
193 cfg80211_regdomain = NULL;
194 if (cfg80211_world_regdom == &world_regdom)
195 cfg80211_world_regdom = NULL;
196 if (cfg80211_regdomain == &world_regdom)
197 cfg80211_regdomain = NULL;
198 if (is_old_static_regdom(cfg80211_regdomain))
199 cfg80211_regdomain = NULL;
200
201 kfree(cfg80211_regdomain);
202 kfree(cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200203
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200204 cfg80211_world_regdom = &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200205 cfg80211_regdomain = NULL;
206}
207
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500208/*
209 * Dynamic world regulatory domain requested by the wireless
210 * core upon initialization
211 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200212static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200213{
Johannes Bergf6037d02008-10-21 11:01:33 +0200214 BUG_ON(!last_request);
Johannes Berg734366d2008-09-15 10:56:48 +0200215
216 reset_regdomains();
217
218 cfg80211_world_regdom = rd;
219 cfg80211_regdomain = rd;
220}
Johannes Berg734366d2008-09-15 10:56:48 +0200221
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200222bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100223{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700224 if (!alpha2)
225 return false;
226 if (alpha2[0] == '0' && alpha2[1] == '0')
227 return true;
228 return false;
Johannes Berg8318d782008-01-24 19:38:38 +0100229}
230
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200231static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700232{
233 if (!alpha2)
234 return false;
235 if (alpha2[0] != 0 && alpha2[1] != 0)
236 return true;
237 return false;
238}
Johannes Berg8318d782008-01-24 19:38:38 +0100239
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700240static bool is_alpha_upper(char letter)
241{
242 /* ASCII A - Z */
243 if (letter >= 65 && letter <= 90)
244 return true;
245 return false;
246}
247
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200248static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700249{
250 if (!alpha2)
251 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500252 /*
253 * Special case where regulatory domain was built by driver
254 * but a specific alpha2 cannot be determined
255 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700256 if (alpha2[0] == '9' && alpha2[1] == '9')
257 return true;
258 return false;
259}
260
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800261static bool is_intersected_alpha2(const char *alpha2)
262{
263 if (!alpha2)
264 return false;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500265 /*
266 * Special case where regulatory domain is the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800267 * result of an intersection between two regulatory domain
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500268 * structures
269 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800270 if (alpha2[0] == '9' && alpha2[1] == '8')
271 return true;
272 return false;
273}
274
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200275static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700276{
277 if (!alpha2)
278 return false;
279 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
280 return true;
281 return false;
282}
283
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200284static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700285{
286 if (!alpha2_x || !alpha2_y)
287 return false;
288 if (alpha2_x[0] == alpha2_y[0] &&
289 alpha2_x[1] == alpha2_y[1])
290 return true;
291 return false;
292}
293
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200294static bool regdom_changed(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700295{
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500296 assert_cfg80211_lock();
297
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700298 if (!cfg80211_regdomain)
299 return true;
300 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
301 return false;
302 return true;
303}
304
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800305/**
306 * country_ie_integrity_changes - tells us if the country IE has changed
307 * @checksum: checksum of country IE of fields we are interested in
308 *
309 * If the country IE has not changed you can ignore it safely. This is
310 * useful to determine if two devices are seeing two different country IEs
311 * even on the same alpha2. Note that this will return false if no IE has
312 * been set on the wireless core yet.
313 */
314static bool country_ie_integrity_changes(u32 checksum)
315{
316 /* If no IE has been set then the checksum doesn't change */
317 if (unlikely(!last_request->country_ie_checksum))
318 return false;
319 if (unlikely(last_request->country_ie_checksum != checksum))
320 return true;
321 return false;
322}
323
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500324/*
325 * This lets us keep regulatory code which is updated on a regulatory
326 * basis in userspace.
327 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700328static int call_crda(const char *alpha2)
329{
330 char country_env[9 + 2] = "COUNTRY=";
331 char *envp[] = {
332 country_env,
333 NULL
334 };
335
336 if (!is_world_regdom((char *) alpha2))
337 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
338 alpha2[0], alpha2[1]);
339 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700340 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
341 "regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700342
343 country_env[8] = alpha2[0];
344 country_env[9] = alpha2[1];
345
346 return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
347}
348
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700349/* Used by nl80211 before kmalloc'ing our regulatory domain */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200350bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700351{
Johannes Bergf6037d02008-10-21 11:01:33 +0200352 if (!last_request)
353 return false;
354
355 return alpha2_equal(last_request->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700356}
357
358/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200359static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700360{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200361 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700362 u32 freq_diff;
363
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800364 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700365 return false;
366
367 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
368 return false;
369
370 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
371
Luis R. Rodriguezd71aaf62008-10-30 13:33:52 -0700372 if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700373 return false;
374
375 return true;
376}
377
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200378static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700379{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200380 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700381 unsigned int i;
382
383 if (!rd->n_reg_rules)
384 return false;
385
Luis R. Rodriguez88dc1c32008-11-12 14:22:01 -0800386 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
387 return false;
388
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700389 for (i = 0; i < rd->n_reg_rules; i++) {
390 reg_rule = &rd->reg_rules[i];
391 if (!is_valid_reg_rule(reg_rule))
392 return false;
393 }
394
395 return true;
396}
397
398/* Returns value in KHz */
399static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
400 u32 freq)
401{
402 unsigned int i;
403 for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
404 u32 start_freq_khz = freq - supported_bandwidths[i]/2;
405 u32 end_freq_khz = freq + supported_bandwidths[i]/2;
406 if (start_freq_khz >= freq_range->start_freq_khz &&
407 end_freq_khz <= freq_range->end_freq_khz)
408 return supported_bandwidths[i];
409 }
410 return 0;
411}
412
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800413/**
414 * freq_in_rule_band - tells us if a frequency is in a frequency band
415 * @freq_range: frequency rule we want to query
416 * @freq_khz: frequency we are inquiring about
417 *
418 * This lets us know if a specific frequency rule is or is not relevant to
419 * a specific frequency's band. Bands are device specific and artificial
420 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
421 * safe for now to assume that a frequency rule should not be part of a
422 * frequency's band if the start freq or end freq are off by more than 2 GHz.
423 * This resolution can be lowered and should be considered as we add
424 * regulatory rule support for other "bands".
425 **/
426static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
427 u32 freq_khz)
428{
429#define ONE_GHZ_IN_KHZ 1000000
430 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
431 return true;
432 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
433 return true;
434 return false;
435#undef ONE_GHZ_IN_KHZ
436}
437
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500438/*
439 * Converts a country IE to a regulatory domain. A regulatory domain
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800440 * structure has a lot of information which the IE doesn't yet have,
441 * so for the other values we use upper max values as we will intersect
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500442 * with our userspace regulatory agent to get lower bounds.
443 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800444static struct ieee80211_regdomain *country_ie_2_rd(
445 u8 *country_ie,
446 u8 country_ie_len,
447 u32 *checksum)
448{
449 struct ieee80211_regdomain *rd = NULL;
450 unsigned int i = 0;
451 char alpha2[2];
452 u32 flags = 0;
453 u32 num_rules = 0, size_of_regd = 0;
454 u8 *triplets_start = NULL;
455 u8 len_at_triplet = 0;
456 /* the last channel we have registered in a subband (triplet) */
457 int last_sub_max_channel = 0;
458
459 *checksum = 0xDEADBEEF;
460
461 /* Country IE requirements */
462 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
463 country_ie_len & 0x01);
464
465 alpha2[0] = country_ie[0];
466 alpha2[1] = country_ie[1];
467
468 /*
469 * Third octet can be:
470 * 'I' - Indoor
471 * 'O' - Outdoor
472 *
473 * anything else we assume is no restrictions
474 */
475 if (country_ie[2] == 'I')
476 flags = NL80211_RRF_NO_OUTDOOR;
477 else if (country_ie[2] == 'O')
478 flags = NL80211_RRF_NO_INDOOR;
479
480 country_ie += 3;
481 country_ie_len -= 3;
482
483 triplets_start = country_ie;
484 len_at_triplet = country_ie_len;
485
486 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
487
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500488 /*
489 * We need to build a reg rule for each triplet, but first we must
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800490 * calculate the number of reg rules we will need. We will need one
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500491 * for each channel subband
492 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800493 while (country_ie_len >= 3) {
Luis R. Rodriguez615aab42009-01-22 15:05:46 -0800494 int end_channel = 0;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800495 struct ieee80211_country_ie_triplet *triplet =
496 (struct ieee80211_country_ie_triplet *) country_ie;
497 int cur_sub_max_channel = 0, cur_channel = 0;
498
499 if (triplet->ext.reg_extension_id >=
500 IEEE80211_COUNTRY_EXTENSION_ID) {
501 country_ie += 3;
502 country_ie_len -= 3;
503 continue;
504 }
505
Luis R. Rodriguez615aab42009-01-22 15:05:46 -0800506 /* 2 GHz */
507 if (triplet->chans.first_channel <= 14)
508 end_channel = triplet->chans.first_channel +
509 triplet->chans.num_channels;
510 else
511 /*
512 * 5 GHz -- For example in country IEs if the first
513 * channel given is 36 and the number of channels is 4
514 * then the individual channel numbers defined for the
515 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
516 * and not 36, 37, 38, 39.
517 *
518 * See: http://tinyurl.com/11d-clarification
519 */
520 end_channel = triplet->chans.first_channel +
521 (4 * (triplet->chans.num_channels - 1));
522
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800523 cur_channel = triplet->chans.first_channel;
Luis R. Rodriguez615aab42009-01-22 15:05:46 -0800524 cur_sub_max_channel = end_channel;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800525
526 /* Basic sanity check */
527 if (cur_sub_max_channel < cur_channel)
528 return NULL;
529
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500530 /*
531 * Do not allow overlapping channels. Also channels
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800532 * passed in each subband must be monotonically
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500533 * increasing
534 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800535 if (last_sub_max_channel) {
536 if (cur_channel <= last_sub_max_channel)
537 return NULL;
538 if (cur_sub_max_channel <= last_sub_max_channel)
539 return NULL;
540 }
541
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500542 /*
543 * When dot11RegulatoryClassesRequired is supported
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800544 * we can throw ext triplets as part of this soup,
545 * for now we don't care when those change as we
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500546 * don't support them
547 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800548 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
549 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
550 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
551
552 last_sub_max_channel = cur_sub_max_channel;
553
554 country_ie += 3;
555 country_ie_len -= 3;
556 num_rules++;
557
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500558 /*
559 * Note: this is not a IEEE requirement but
560 * simply a memory requirement
561 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800562 if (num_rules > NL80211_MAX_SUPP_REG_RULES)
563 return NULL;
564 }
565
566 country_ie = triplets_start;
567 country_ie_len = len_at_triplet;
568
569 size_of_regd = sizeof(struct ieee80211_regdomain) +
570 (num_rules * sizeof(struct ieee80211_reg_rule));
571
572 rd = kzalloc(size_of_regd, GFP_KERNEL);
573 if (!rd)
574 return NULL;
575
576 rd->n_reg_rules = num_rules;
577 rd->alpha2[0] = alpha2[0];
578 rd->alpha2[1] = alpha2[1];
579
580 /* This time around we fill in the rd */
581 while (country_ie_len >= 3) {
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800582 int end_channel = 0;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800583 struct ieee80211_country_ie_triplet *triplet =
584 (struct ieee80211_country_ie_triplet *) country_ie;
585 struct ieee80211_reg_rule *reg_rule = NULL;
586 struct ieee80211_freq_range *freq_range = NULL;
587 struct ieee80211_power_rule *power_rule = NULL;
588
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500589 /*
590 * Must parse if dot11RegulatoryClassesRequired is true,
591 * we don't support this yet
592 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800593 if (triplet->ext.reg_extension_id >=
594 IEEE80211_COUNTRY_EXTENSION_ID) {
595 country_ie += 3;
596 country_ie_len -= 3;
597 continue;
598 }
599
600 reg_rule = &rd->reg_rules[i];
601 freq_range = &reg_rule->freq_range;
602 power_rule = &reg_rule->power_rule;
603
604 reg_rule->flags = flags;
605
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800606 /* 2 GHz */
607 if (triplet->chans.first_channel <= 14)
608 end_channel = triplet->chans.first_channel +
609 triplet->chans.num_channels;
610 else
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800611 end_channel = triplet->chans.first_channel +
612 (4 * (triplet->chans.num_channels - 1));
613
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500614 /*
615 * The +10 is since the regulatory domain expects
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800616 * the actual band edge, not the center of freq for
617 * its start and end freqs, assuming 20 MHz bandwidth on
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500618 * the channels passed
619 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800620 freq_range->start_freq_khz =
621 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
622 triplet->chans.first_channel) - 10);
623 freq_range->end_freq_khz =
624 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800625 end_channel) + 10);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800626
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500627 /*
628 * These are large arbitrary values we use to intersect later.
629 * Increment this if we ever support >= 40 MHz channels
630 * in IEEE 802.11
631 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800632 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
633 power_rule->max_antenna_gain = DBI_TO_MBI(100);
634 power_rule->max_eirp = DBM_TO_MBM(100);
635
636 country_ie += 3;
637 country_ie_len -= 3;
638 i++;
639
640 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
641 }
642
643 return rd;
644}
645
646
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500647/*
648 * Helper for regdom_intersect(), this does the real
649 * mathematical intersection fun
650 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700651static int reg_rules_intersect(
652 const struct ieee80211_reg_rule *rule1,
653 const struct ieee80211_reg_rule *rule2,
654 struct ieee80211_reg_rule *intersected_rule)
655{
656 const struct ieee80211_freq_range *freq_range1, *freq_range2;
657 struct ieee80211_freq_range *freq_range;
658 const struct ieee80211_power_rule *power_rule1, *power_rule2;
659 struct ieee80211_power_rule *power_rule;
660 u32 freq_diff;
661
662 freq_range1 = &rule1->freq_range;
663 freq_range2 = &rule2->freq_range;
664 freq_range = &intersected_rule->freq_range;
665
666 power_rule1 = &rule1->power_rule;
667 power_rule2 = &rule2->power_rule;
668 power_rule = &intersected_rule->power_rule;
669
670 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
671 freq_range2->start_freq_khz);
672 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
673 freq_range2->end_freq_khz);
674 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
675 freq_range2->max_bandwidth_khz);
676
677 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
678 if (freq_range->max_bandwidth_khz > freq_diff)
679 freq_range->max_bandwidth_khz = freq_diff;
680
681 power_rule->max_eirp = min(power_rule1->max_eirp,
682 power_rule2->max_eirp);
683 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
684 power_rule2->max_antenna_gain);
685
686 intersected_rule->flags = (rule1->flags | rule2->flags);
687
688 if (!is_valid_reg_rule(intersected_rule))
689 return -EINVAL;
690
691 return 0;
692}
693
694/**
695 * regdom_intersect - do the intersection between two regulatory domains
696 * @rd1: first regulatory domain
697 * @rd2: second regulatory domain
698 *
699 * Use this function to get the intersection between two regulatory domains.
700 * Once completed we will mark the alpha2 for the rd as intersected, "98",
701 * as no one single alpha2 can represent this regulatory domain.
702 *
703 * Returns a pointer to the regulatory domain structure which will hold the
704 * resulting intersection of rules between rd1 and rd2. We will
705 * kzalloc() this structure for you.
706 */
707static struct ieee80211_regdomain *regdom_intersect(
708 const struct ieee80211_regdomain *rd1,
709 const struct ieee80211_regdomain *rd2)
710{
711 int r, size_of_regd;
712 unsigned int x, y;
713 unsigned int num_rules = 0, rule_idx = 0;
714 const struct ieee80211_reg_rule *rule1, *rule2;
715 struct ieee80211_reg_rule *intersected_rule;
716 struct ieee80211_regdomain *rd;
717 /* This is just a dummy holder to help us count */
718 struct ieee80211_reg_rule irule;
719
720 /* Uses the stack temporarily for counter arithmetic */
721 intersected_rule = &irule;
722
723 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
724
725 if (!rd1 || !rd2)
726 return NULL;
727
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500728 /*
729 * First we get a count of the rules we'll need, then we actually
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700730 * build them. This is to so we can malloc() and free() a
731 * regdomain once. The reason we use reg_rules_intersect() here
732 * is it will return -EINVAL if the rule computed makes no sense.
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500733 * All rules that do check out OK are valid.
734 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700735
736 for (x = 0; x < rd1->n_reg_rules; x++) {
737 rule1 = &rd1->reg_rules[x];
738 for (y = 0; y < rd2->n_reg_rules; y++) {
739 rule2 = &rd2->reg_rules[y];
740 if (!reg_rules_intersect(rule1, rule2,
741 intersected_rule))
742 num_rules++;
743 memset(intersected_rule, 0,
744 sizeof(struct ieee80211_reg_rule));
745 }
746 }
747
748 if (!num_rules)
749 return NULL;
750
751 size_of_regd = sizeof(struct ieee80211_regdomain) +
752 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
753
754 rd = kzalloc(size_of_regd, GFP_KERNEL);
755 if (!rd)
756 return NULL;
757
758 for (x = 0; x < rd1->n_reg_rules; x++) {
759 rule1 = &rd1->reg_rules[x];
760 for (y = 0; y < rd2->n_reg_rules; y++) {
761 rule2 = &rd2->reg_rules[y];
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500762 /*
763 * This time around instead of using the stack lets
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700764 * write to the target rule directly saving ourselves
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500765 * a memcpy()
766 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700767 intersected_rule = &rd->reg_rules[rule_idx];
768 r = reg_rules_intersect(rule1, rule2,
769 intersected_rule);
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500770 /*
771 * No need to memset here the intersected rule here as
772 * we're not using the stack anymore
773 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700774 if (r)
775 continue;
776 rule_idx++;
777 }
778 }
779
780 if (rule_idx != num_rules) {
781 kfree(rd);
782 return NULL;
783 }
784
785 rd->n_reg_rules = num_rules;
786 rd->alpha2[0] = '9';
787 rd->alpha2[1] = '8';
788
789 return rd;
790}
791
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500792/*
793 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
794 * want to just have the channel structure use these
795 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700796static u32 map_regdom_flags(u32 rd_flags)
797{
798 u32 channel_flags = 0;
799 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
800 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
801 if (rd_flags & NL80211_RRF_NO_IBSS)
802 channel_flags |= IEEE80211_CHAN_NO_IBSS;
803 if (rd_flags & NL80211_RRF_DFS)
804 channel_flags |= IEEE80211_CHAN_RADAR;
805 return channel_flags;
806}
807
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800808static int freq_reg_info_regd(struct wiphy *wiphy,
809 u32 center_freq,
810 u32 *bandwidth,
811 const struct ieee80211_reg_rule **reg_rule,
812 const struct ieee80211_regdomain *custom_regd)
Johannes Berg8318d782008-01-24 19:38:38 +0100813{
814 int i;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800815 bool band_rule_found = false;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800816 const struct ieee80211_regdomain *regd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700817 u32 max_bandwidth = 0;
Johannes Berg8318d782008-01-24 19:38:38 +0100818
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800819 regd = custom_regd ? custom_regd : cfg80211_regdomain;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800820
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500821 /*
822 * Follow the driver's regulatory domain, if present, unless a country
823 * IE has been processed or a user wants to help complaince further
824 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800825 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez24ed1da2009-01-22 15:05:54 -0800826 last_request->initiator != REGDOM_SET_BY_USER &&
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800827 wiphy->regd)
828 regd = wiphy->regd;
829
830 if (!regd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700831 return -EINVAL;
832
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800833 for (i = 0; i < regd->n_reg_rules; i++) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700834 const struct ieee80211_reg_rule *rr;
835 const struct ieee80211_freq_range *fr = NULL;
836 const struct ieee80211_power_rule *pr = NULL;
837
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800838 rr = &regd->reg_rules[i];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700839 fr = &rr->freq_range;
840 pr = &rr->power_rule;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800841
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500842 /*
843 * We only need to know if one frequency rule was
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800844 * was in center_freq's band, that's enough, so lets
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500845 * not overwrite it once found
846 */
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800847 if (!band_rule_found)
848 band_rule_found = freq_in_rule_band(fr, center_freq);
849
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700850 max_bandwidth = freq_max_bandwidth(fr, center_freq);
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800851
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700852 if (max_bandwidth && *bandwidth <= max_bandwidth) {
853 *reg_rule = rr;
854 *bandwidth = max_bandwidth;
Johannes Berg8318d782008-01-24 19:38:38 +0100855 break;
856 }
857 }
858
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800859 if (!band_rule_found)
860 return -ERANGE;
861
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700862 return !max_bandwidth;
863}
Luis R. Rodriguez34f57342009-01-22 15:05:45 -0800864EXPORT_SYMBOL(freq_reg_info);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700865
Luis R. Rodriguez34f57342009-01-22 15:05:45 -0800866int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800867 const struct ieee80211_reg_rule **reg_rule)
868{
869 return freq_reg_info_regd(wiphy, center_freq,
870 bandwidth, reg_rule, NULL);
871}
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700872
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800873static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
874 unsigned int chan_idx)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700875{
876 int r;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800877 u32 flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700878 u32 max_bandwidth = 0;
879 const struct ieee80211_reg_rule *reg_rule = NULL;
880 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800881 struct ieee80211_supported_band *sband;
882 struct ieee80211_channel *chan;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -0500883 struct wiphy *request_wiphy = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800884
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500885 assert_cfg80211_lock();
886
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500887 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
888
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800889 sband = wiphy->bands[band];
890 BUG_ON(chan_idx >= sband->n_channels);
891 chan = &sband->channels[chan_idx];
892
893 flags = chan->orig_flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700894
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800895 r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq),
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700896 &max_bandwidth, &reg_rule);
897
898 if (r) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500899 /*
900 * This means no regulatory rule was found in the country IE
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800901 * with a frequency range on the center_freq's band, since
902 * IEEE-802.11 allows for a country IE to have a subset of the
903 * regulatory information provided in a country we ignore
904 * disabling the channel unless at least one reg rule was
905 * found on the center_freq's band. For details see this
906 * clarification:
907 *
908 * http://tinyurl.com/11d-clarification
909 */
910 if (r == -ERANGE &&
911 last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
912#ifdef CONFIG_CFG80211_REG_DEBUG
913 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
914 "intact on %s - no rule found in band on "
915 "Country IE\n",
916 chan->center_freq, wiphy_name(wiphy));
917#endif
918 } else {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500919 /*
920 * In this case we know the country IE has at least one reg rule
921 * for the band so we respect its band definitions
922 */
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800923#ifdef CONFIG_CFG80211_REG_DEBUG
924 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
925 printk(KERN_DEBUG "cfg80211: Disabling "
926 "channel %d MHz on %s due to "
927 "Country IE\n",
928 chan->center_freq, wiphy_name(wiphy));
929#endif
930 flags |= IEEE80211_CHAN_DISABLED;
931 chan->flags = flags;
932 }
Johannes Berg8318d782008-01-24 19:38:38 +0100933 return;
934 }
935
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700936 power_rule = &reg_rule->power_rule;
937
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800938 if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500939 request_wiphy && request_wiphy == wiphy &&
940 request_wiphy->strict_regulatory) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500941 /*
942 * This gaurantees the driver's requested regulatory domain
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800943 * will always be used as a base for further regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500944 * settings
945 */
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800946 chan->flags = chan->orig_flags =
947 map_regdom_flags(reg_rule->flags);
948 chan->max_antenna_gain = chan->orig_mag =
949 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
950 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
951 chan->max_power = chan->orig_mpwr =
952 (int) MBM_TO_DBM(power_rule->max_eirp);
953 return;
954 }
955
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700956 chan->flags = flags | map_regdom_flags(reg_rule->flags);
Johannes Berg8318d782008-01-24 19:38:38 +0100957 chan->max_antenna_gain = min(chan->orig_mag,
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700958 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
959 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
John W. Linville253898c2008-04-03 15:32:54 -0400960 if (chan->orig_mpwr)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700961 chan->max_power = min(chan->orig_mpwr,
962 (int) MBM_TO_DBM(power_rule->max_eirp));
John W. Linville253898c2008-04-03 15:32:54 -0400963 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700964 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
Johannes Berg8318d782008-01-24 19:38:38 +0100965}
966
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800967static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
Johannes Berg8318d782008-01-24 19:38:38 +0100968{
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800969 unsigned int i;
970 struct ieee80211_supported_band *sband;
971
972 BUG_ON(!wiphy->bands[band]);
973 sband = wiphy->bands[band];
Johannes Berg8318d782008-01-24 19:38:38 +0100974
975 for (i = 0; i < sband->n_channels; i++)
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800976 handle_channel(wiphy, band, i);
Johannes Berg8318d782008-01-24 19:38:38 +0100977}
978
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800979static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby)
980{
981 if (!last_request)
982 return true;
983 if (setby == REGDOM_SET_BY_CORE &&
Luis R. Rodriguez2a44f912009-01-22 15:05:49 -0800984 wiphy->custom_regulatory)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800985 return true;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -0500986 /*
987 * wiphy->regd will be set once the device has its own
988 * desired regulatory domain set
989 */
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800990 if (wiphy->strict_regulatory && !wiphy->regd &&
991 !is_world_regdom(last_request->alpha2))
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800992 return true;
993 return false;
994}
995
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700996static void update_all_wiphy_regulatory(enum reg_set_by setby)
997{
998 struct cfg80211_registered_device *drv;
999
1000 list_for_each_entry(drv, &cfg80211_drv_list, list)
Luis R. Rodriguezd46e5b12009-01-22 15:05:50 -08001001 wiphy_update_regulatory(&drv->wiphy, setby);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001002}
1003
1004void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
Johannes Berg8318d782008-01-24 19:38:38 +01001005{
1006 enum ieee80211_band band;
Luis R. Rodriguezd46e5b12009-01-22 15:05:50 -08001007
1008 if (ignore_reg_update(wiphy, setby))
1009 return;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001010 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Johannes Berg8318d782008-01-24 19:38:38 +01001011 if (wiphy->bands[band])
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -08001012 handle_band(wiphy, band);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001013 }
Luis R. Rodriguez560e28e2009-01-07 17:43:32 -08001014 if (wiphy->reg_notifier)
Luis R. Rodriguez716f9392009-01-22 15:05:51 -08001015 wiphy->reg_notifier(wiphy, last_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001016}
1017
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -08001018static void handle_channel_custom(struct wiphy *wiphy,
1019 enum ieee80211_band band,
1020 unsigned int chan_idx,
1021 const struct ieee80211_regdomain *regd)
1022{
1023 int r;
1024 u32 max_bandwidth = 0;
1025 const struct ieee80211_reg_rule *reg_rule = NULL;
1026 const struct ieee80211_power_rule *power_rule = NULL;
1027 struct ieee80211_supported_band *sband;
1028 struct ieee80211_channel *chan;
1029
1030 sband = wiphy->bands[band];
1031 BUG_ON(chan_idx >= sband->n_channels);
1032 chan = &sband->channels[chan_idx];
1033
1034 r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
1035 &max_bandwidth, &reg_rule, regd);
1036
1037 if (r) {
1038 chan->flags = IEEE80211_CHAN_DISABLED;
1039 return;
1040 }
1041
1042 power_rule = &reg_rule->power_rule;
1043
1044 chan->flags |= map_regdom_flags(reg_rule->flags);
1045 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
1046 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
1047 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
1048}
1049
1050static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
1051 const struct ieee80211_regdomain *regd)
1052{
1053 unsigned int i;
1054 struct ieee80211_supported_band *sband;
1055
1056 BUG_ON(!wiphy->bands[band]);
1057 sband = wiphy->bands[band];
1058
1059 for (i = 0; i < sband->n_channels; i++)
1060 handle_channel_custom(wiphy, band, i, regd);
1061}
1062
1063/* Used by drivers prior to wiphy registration */
1064void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1065 const struct ieee80211_regdomain *regd)
1066{
1067 enum ieee80211_band band;
1068 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1069 if (wiphy->bands[band])
1070 handle_band_custom(wiphy, band, regd);
1071 }
1072}
1073EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1074
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001075static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
1076 const struct ieee80211_regdomain *src_regd)
1077{
1078 struct ieee80211_regdomain *regd;
1079 int size_of_regd = 0;
1080 unsigned int i;
1081
1082 size_of_regd = sizeof(struct ieee80211_regdomain) +
1083 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
1084
1085 regd = kzalloc(size_of_regd, GFP_KERNEL);
1086 if (!regd)
1087 return -ENOMEM;
1088
1089 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
1090
1091 for (i = 0; i < src_regd->n_reg_rules; i++)
1092 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
1093 sizeof(struct ieee80211_reg_rule));
1094
1095 *dst_regd = regd;
1096 return 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001097}
1098
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001099/*
1100 * Return value which can be used by ignore_request() to indicate
1101 * it has been determined we should intersect two regulatory domains
1102 */
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001103#define REG_INTERSECT 1
1104
Johannes Berg84fa4f42008-10-24 20:32:23 +02001105/* This has the logic which determines when a new request
1106 * should be ignored. */
1107static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
1108 const char *alpha2)
1109{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001110 struct wiphy *last_wiphy = NULL;
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001111
1112 assert_cfg80211_lock();
1113
Johannes Berg84fa4f42008-10-24 20:32:23 +02001114 /* All initial requests are respected */
1115 if (!last_request)
1116 return 0;
1117
1118 switch (set_by) {
1119 case REGDOM_SET_BY_INIT:
1120 return -EINVAL;
1121 case REGDOM_SET_BY_CORE:
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001122 return -EINVAL;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001123 case REGDOM_SET_BY_COUNTRY_IE:
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001124
1125 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1126
Johannes Berg84fa4f42008-10-24 20:32:23 +02001127 if (unlikely(!is_an_alpha2(alpha2)))
1128 return -EINVAL;
1129 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001130 if (last_wiphy != wiphy) {
Johannes Berg84fa4f42008-10-24 20:32:23 +02001131 /*
1132 * Two cards with two APs claiming different
1133 * different Country IE alpha2s. We could
1134 * intersect them, but that seems unlikely
1135 * to be correct. Reject second one for now.
1136 */
1137 if (!alpha2_equal(alpha2,
1138 cfg80211_regdomain->alpha2))
1139 return -EOPNOTSUPP;
1140 return -EALREADY;
1141 }
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001142 /*
1143 * Two consecutive Country IE hints on the same wiphy.
1144 * This should be picked up early by the driver/stack
1145 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001146 if (WARN_ON(!alpha2_equal(cfg80211_regdomain->alpha2,
1147 alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001148 return 0;
1149 return -EALREADY;
1150 }
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001151 return REG_INTERSECT;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001152 case REGDOM_SET_BY_DRIVER:
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001153 if (last_request->initiator == REGDOM_SET_BY_CORE) {
1154 if (is_old_static_regdom(cfg80211_regdomain))
1155 return 0;
1156 if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
1157 return 0;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001158 return -EALREADY;
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001159 }
Luis R. Rodriguezfff32c02009-02-21 00:04:32 -05001160
1161 /*
1162 * This would happen if you unplug and plug your card
1163 * back in or if you add a new device for which the previously
1164 * loaded card also agrees on the regulatory domain.
1165 */
1166 if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
1167 alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
1168 return -EALREADY;
1169
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001170 return REG_INTERSECT;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001171 case REGDOM_SET_BY_USER:
Johannes Berg84fa4f42008-10-24 20:32:23 +02001172 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001173 return REG_INTERSECT;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001174 /*
1175 * If the user knows better the user should set the regdom
1176 * to their country before the IE is picked up
1177 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001178 if (last_request->initiator == REGDOM_SET_BY_USER &&
1179 last_request->intersect)
1180 return -EOPNOTSUPP;
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001181 /*
1182 * Process user requests only after previous user/driver/core
1183 * requests have been processed
1184 */
Luis R. Rodriguez5eebade2009-01-22 15:05:47 -08001185 if (last_request->initiator == REGDOM_SET_BY_CORE ||
1186 last_request->initiator == REGDOM_SET_BY_DRIVER ||
1187 last_request->initiator == REGDOM_SET_BY_USER) {
1188 if (!alpha2_equal(last_request->alpha2,
1189 cfg80211_regdomain->alpha2))
1190 return -EAGAIN;
1191 }
1192
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001193 if (!is_old_static_regdom(cfg80211_regdomain) &&
1194 alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
1195 return -EALREADY;
1196
Johannes Berg84fa4f42008-10-24 20:32:23 +02001197 return 0;
1198 }
1199
1200 return -EINVAL;
1201}
1202
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001203/* Caller must hold &cfg80211_mutex */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001204int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001205 const char *alpha2,
1206 u32 country_ie_checksum,
1207 enum environment_cap env)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001208{
1209 struct regulatory_request *request;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001210 bool intersect = false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001211 int r = 0;
1212
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001213 assert_cfg80211_lock();
1214
Johannes Bergbe3d4812008-10-24 20:32:21 +02001215 r = ignore_request(wiphy, set_by, alpha2);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001216
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001217 if (r == REG_INTERSECT) {
1218 if (set_by == REGDOM_SET_BY_DRIVER) {
1219 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1220 if (r)
1221 return r;
1222 }
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001223 intersect = true;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001224 } else if (r) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001225 /*
1226 * If the regulatory domain being requested by the
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001227 * driver has already been set just copy it to the
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001228 * wiphy
1229 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001230 if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) {
1231 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1232 if (r)
1233 return r;
1234 r = -EALREADY;
1235 goto new_request;
1236 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001237 return r;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001238 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001239
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001240new_request:
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001241 request = kzalloc(sizeof(struct regulatory_request),
1242 GFP_KERNEL);
1243 if (!request)
1244 return -ENOMEM;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001245
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001246 request->alpha2[0] = alpha2[0];
1247 request->alpha2[1] = alpha2[1];
1248 request->initiator = set_by;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001249 request->wiphy_idx = get_wiphy_idx(wiphy);
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001250 request->intersect = intersect;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001251 request->country_ie_checksum = country_ie_checksum;
1252 request->country_ie_env = env;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001253
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001254 kfree(last_request);
1255 last_request = request;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001256
1257 /* When r == REG_INTERSECT we do need to call CRDA */
1258 if (r < 0)
1259 return r;
1260
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001261 /*
1262 * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
1263 * AND if CRDA is NOT present nothing will happen, if someone
1264 * wants to bother with 11d with OLD_REG you can add a timer.
1265 * If after x amount of time nothing happens you can call:
1266 *
1267 * return set_regdom(country_ie_regdomain);
1268 *
1269 * to intersect with the static rd
1270 */
Luis R. Rodriguez02ba0b32008-11-12 14:22:00 -08001271 return call_crda(alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001272}
1273
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001274/* This currently only processes user and driver regulatory hints */
1275static int reg_process_hint(struct regulatory_request *reg_request)
1276{
1277 int r = 0;
1278 struct wiphy *wiphy = NULL;
1279
1280 BUG_ON(!reg_request->alpha2);
1281
1282 mutex_lock(&cfg80211_mutex);
1283
1284 if (wiphy_idx_valid(reg_request->wiphy_idx))
1285 wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
1286
1287 if (reg_request->initiator == REGDOM_SET_BY_DRIVER &&
1288 !wiphy) {
1289 r = -ENODEV;
1290 goto out;
1291 }
1292
1293 r = __regulatory_hint(wiphy,
1294 reg_request->initiator,
1295 reg_request->alpha2,
1296 reg_request->country_ie_checksum,
1297 reg_request->country_ie_env);
1298 /* This is required so that the orig_* parameters are saved */
1299 if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
1300 wiphy_update_regulatory(wiphy, reg_request->initiator);
1301out:
1302 mutex_unlock(&cfg80211_mutex);
1303
1304 if (r == -EALREADY)
1305 r = 0;
1306
1307 return r;
1308}
1309
1310static void reg_process_pending_hints(void)
1311 {
1312 struct regulatory_request *reg_request;
1313 int r;
1314
1315 spin_lock(&reg_requests_lock);
1316 while (!list_empty(&reg_requests_list)) {
1317 reg_request = list_first_entry(&reg_requests_list,
1318 struct regulatory_request,
1319 list);
1320 list_del_init(&reg_request->list);
1321 spin_unlock(&reg_requests_lock);
1322
1323 r = reg_process_hint(reg_request);
1324#ifdef CONFIG_CFG80211_REG_DEBUG
1325 if (r && (reg_request->initiator == REGDOM_SET_BY_DRIVER ||
1326 reg_request->initiator == REGDOM_SET_BY_COUNTRY_IE))
1327 printk(KERN_ERR "cfg80211: wiphy_idx %d sent a "
1328 "regulatory hint for %c%c but now has "
1329 "gone fishing, ignoring request\n",
1330 reg_request->wiphy_idx,
1331 reg_request->alpha2[0],
1332 reg_request->alpha2[1]);
1333#endif
1334 kfree(reg_request);
1335 spin_lock(&reg_requests_lock);
1336 }
1337 spin_unlock(&reg_requests_lock);
1338}
1339
1340static void reg_todo(struct work_struct *work)
1341{
1342 reg_process_pending_hints();
1343}
1344
1345static DECLARE_WORK(reg_work, reg_todo);
1346
1347static void queue_regulatory_request(struct regulatory_request *request)
1348{
1349 spin_lock(&reg_requests_lock);
1350 list_add_tail(&request->list, &reg_requests_list);
1351 spin_unlock(&reg_requests_lock);
1352
1353 schedule_work(&reg_work);
1354}
1355
1356/* Core regulatory hint -- happens once during cfg80211_init() */
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001357static int regulatory_hint_core(const char *alpha2)
1358{
1359 struct regulatory_request *request;
1360
1361 BUG_ON(last_request);
1362
1363 request = kzalloc(sizeof(struct regulatory_request),
1364 GFP_KERNEL);
1365 if (!request)
1366 return -ENOMEM;
1367
1368 request->alpha2[0] = alpha2[0];
1369 request->alpha2[1] = alpha2[1];
1370 request->initiator = REGDOM_SET_BY_CORE;
1371
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001372 queue_regulatory_request(request);
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001373
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001374 return 0;
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001375}
1376
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001377/* User hints */
1378int regulatory_hint_user(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001379{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001380 struct regulatory_request *request;
1381
Johannes Bergbe3d4812008-10-24 20:32:21 +02001382 BUG_ON(!alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001383
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001384 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1385 if (!request)
1386 return -ENOMEM;
1387
1388 request->wiphy_idx = WIPHY_IDX_STALE;
1389 request->alpha2[0] = alpha2[0];
1390 request->alpha2[1] = alpha2[1];
1391 request->initiator = REGDOM_SET_BY_USER,
1392
1393 queue_regulatory_request(request);
1394
1395 return 0;
1396}
1397
1398/* Driver hints */
1399int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1400{
1401 struct regulatory_request *request;
1402
1403 BUG_ON(!alpha2);
1404 BUG_ON(!wiphy);
1405
1406 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1407 if (!request)
1408 return -ENOMEM;
1409
1410 request->wiphy_idx = get_wiphy_idx(wiphy);
1411
1412 /* Must have registered wiphy first */
1413 BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
1414
1415 request->alpha2[0] = alpha2[0];
1416 request->alpha2[1] = alpha2[1];
1417 request->initiator = REGDOM_SET_BY_DRIVER;
1418
1419 queue_regulatory_request(request);
1420
1421 return 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001422}
1423EXPORT_SYMBOL(regulatory_hint);
1424
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001425static bool reg_same_country_ie_hint(struct wiphy *wiphy,
1426 u32 country_ie_checksum)
1427{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001428 struct wiphy *request_wiphy;
1429
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001430 assert_cfg80211_lock();
1431
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001432 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1433
1434 if (!request_wiphy)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001435 return false;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001436
1437 if (likely(request_wiphy != wiphy))
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001438 return !country_ie_integrity_changes(country_ie_checksum);
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001439 /*
1440 * We should not have let these through at this point, they
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001441 * should have been picked up earlier by the first alpha2 check
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001442 * on the device
1443 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001444 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
1445 return true;
1446 return false;
1447}
1448
1449void regulatory_hint_11d(struct wiphy *wiphy,
1450 u8 *country_ie,
1451 u8 country_ie_len)
1452{
1453 struct ieee80211_regdomain *rd = NULL;
1454 char alpha2[2];
1455 u32 checksum = 0;
1456 enum environment_cap env = ENVIRON_ANY;
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001457 struct regulatory_request *request;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001458
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001459 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001460
Luis R. Rodriguezd335fe62009-02-21 00:04:27 -05001461 if (unlikely(!last_request)) {
1462 mutex_unlock(&cfg80211_mutex);
1463 return;
1464 }
1465
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001466 /* IE len must be evenly divisible by 2 */
1467 if (country_ie_len & 0x01)
1468 goto out;
1469
1470 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1471 goto out;
1472
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001473 /*
1474 * Pending country IE processing, this can happen after we
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001475 * call CRDA and wait for a response if a beacon was received before
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001476 * we were able to process the last regulatory_hint_11d() call
1477 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001478 if (country_ie_regdomain)
1479 goto out;
1480
1481 alpha2[0] = country_ie[0];
1482 alpha2[1] = country_ie[1];
1483
1484 if (country_ie[2] == 'I')
1485 env = ENVIRON_INDOOR;
1486 else if (country_ie[2] == 'O')
1487 env = ENVIRON_OUTDOOR;
1488
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001489 /*
1490 * We will run this for *every* beacon processed for the BSSID, so
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001491 * we optimize an early check to exit out early if we don't have to
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001492 * do anything
1493 */
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001494 if (likely(wiphy_idx_valid(last_request->wiphy_idx))) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001495 struct cfg80211_registered_device *drv_last_ie;
1496
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001497 drv_last_ie =
1498 cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001499
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001500 /*
1501 * Lets keep this simple -- we trust the first AP
1502 * after we intersect with CRDA
1503 */
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001504 if (likely(&drv_last_ie->wiphy == wiphy)) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001505 /*
1506 * Ignore IEs coming in on this wiphy with
1507 * the same alpha2 and environment cap
1508 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001509 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1510 alpha2) &&
1511 env == drv_last_ie->env)) {
1512 goto out;
1513 }
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001514 /*
1515 * the wiphy moved on to another BSSID or the AP
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001516 * was reconfigured. XXX: We need to deal with the
1517 * case where the user suspends and goes to goes
1518 * to another country, and then gets IEs from an
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001519 * AP with different settings
1520 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001521 goto out;
1522 } else {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001523 /*
1524 * Ignore IEs coming in on two separate wiphys with
1525 * the same alpha2 and environment cap
1526 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001527 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1528 alpha2) &&
1529 env == drv_last_ie->env)) {
1530 goto out;
1531 }
1532 /* We could potentially intersect though */
1533 goto out;
1534 }
1535 }
1536
1537 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
1538 if (!rd)
1539 goto out;
1540
Luis R. Rodriguez915278e2009-02-21 00:04:28 -05001541 /*
1542 * This will not happen right now but we leave it here for the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001543 * the future when we want to add suspend/resume support and having
1544 * the user move to another country after doing so, or having the user
Luis R. Rodriguez915278e2009-02-21 00:04:28 -05001545 * move to another AP. Right now we just trust the first AP.
1546 *
1547 * If we hit this before we add this support we want to be informed of
1548 * it as it would indicate a mistake in the current design
1549 */
1550 if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))
Luis R. Rodriguez0441d6f2009-02-21 00:04:29 -05001551 goto free_rd_out;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001552
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001553 request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
1554 if (!request)
1555 goto free_rd_out;
1556
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001557 /*
1558 * We keep this around for when CRDA comes back with a response so
1559 * we can intersect with that
1560 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001561 country_ie_regdomain = rd;
1562
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001563 request->wiphy_idx = get_wiphy_idx(wiphy);
1564 request->alpha2[0] = rd->alpha2[0];
1565 request->alpha2[1] = rd->alpha2[1];
1566 request->initiator = REGDOM_SET_BY_COUNTRY_IE;
1567 request->country_ie_checksum = checksum;
1568 request->country_ie_env = env;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001569
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001570 mutex_unlock(&cfg80211_mutex);
1571
1572 queue_regulatory_request(request);
1573
1574 return;
Luis R. Rodriguez0441d6f2009-02-21 00:04:29 -05001575
1576free_rd_out:
1577 kfree(rd);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001578out:
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001579 mutex_unlock(&cfg80211_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001580}
1581EXPORT_SYMBOL(regulatory_hint_11d);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001582
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001583static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001584{
1585 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001586 const struct ieee80211_reg_rule *reg_rule = NULL;
1587 const struct ieee80211_freq_range *freq_range = NULL;
1588 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001589
1590 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
1591 "(max_antenna_gain, max_eirp)\n");
1592
1593 for (i = 0; i < rd->n_reg_rules; i++) {
1594 reg_rule = &rd->reg_rules[i];
1595 freq_range = &reg_rule->freq_range;
1596 power_rule = &reg_rule->power_rule;
1597
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001598 /*
1599 * There may not be documentation for max antenna gain
1600 * in certain regions
1601 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001602 if (power_rule->max_antenna_gain)
1603 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1604 "(%d mBi, %d mBm)\n",
1605 freq_range->start_freq_khz,
1606 freq_range->end_freq_khz,
1607 freq_range->max_bandwidth_khz,
1608 power_rule->max_antenna_gain,
1609 power_rule->max_eirp);
1610 else
1611 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1612 "(N/A, %d mBm)\n",
1613 freq_range->start_freq_khz,
1614 freq_range->end_freq_khz,
1615 freq_range->max_bandwidth_khz,
1616 power_rule->max_eirp);
1617 }
1618}
1619
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001620static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001621{
1622
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001623 if (is_intersected_alpha2(rd->alpha2)) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001624
1625 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001626 struct cfg80211_registered_device *drv;
1627 drv = cfg80211_drv_by_wiphy_idx(
1628 last_request->wiphy_idx);
1629 if (drv) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001630 printk(KERN_INFO "cfg80211: Current regulatory "
1631 "domain updated by AP to: %c%c\n",
1632 drv->country_ie_alpha2[0],
1633 drv->country_ie_alpha2[1]);
1634 } else
1635 printk(KERN_INFO "cfg80211: Current regulatory "
1636 "domain intersected: \n");
1637 } else
1638 printk(KERN_INFO "cfg80211: Current regulatory "
Luis R. Rodriguez039498c2009-01-07 17:43:35 -08001639 "domain intersected: \n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001640 } else if (is_world_regdom(rd->alpha2))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001641 printk(KERN_INFO "cfg80211: World regulatory "
1642 "domain updated:\n");
1643 else {
1644 if (is_unknown_alpha2(rd->alpha2))
1645 printk(KERN_INFO "cfg80211: Regulatory domain "
1646 "changed to driver built-in settings "
1647 "(unknown country)\n");
1648 else
1649 printk(KERN_INFO "cfg80211: Regulatory domain "
1650 "changed to country: %c%c\n",
1651 rd->alpha2[0], rd->alpha2[1]);
1652 }
1653 print_rd_rules(rd);
1654}
1655
Johannes Berg2df78162008-10-28 16:49:41 +01001656static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001657{
1658 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1659 rd->alpha2[0], rd->alpha2[1]);
1660 print_rd_rules(rd);
1661}
1662
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001663#ifdef CONFIG_CFG80211_REG_DEBUG
1664static void reg_country_ie_process_debug(
1665 const struct ieee80211_regdomain *rd,
1666 const struct ieee80211_regdomain *country_ie_regdomain,
1667 const struct ieee80211_regdomain *intersected_rd)
1668{
1669 printk(KERN_DEBUG "cfg80211: Received country IE:\n");
1670 print_regdomain_info(country_ie_regdomain);
1671 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
1672 print_regdomain_info(rd);
1673 if (intersected_rd) {
1674 printk(KERN_DEBUG "cfg80211: We intersect both of these "
1675 "and get:\n");
Luis R. Rodriguez667ecd02009-01-22 15:05:43 -08001676 print_regdomain_info(intersected_rd);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001677 return;
1678 }
1679 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
1680}
1681#else
1682static inline void reg_country_ie_process_debug(
1683 const struct ieee80211_regdomain *rd,
1684 const struct ieee80211_regdomain *country_ie_regdomain,
1685 const struct ieee80211_regdomain *intersected_rd)
1686{
1687}
1688#endif
1689
Johannes Bergd2372b32008-10-24 20:32:20 +02001690/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001691static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001692{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001693 const struct ieee80211_regdomain *intersected_rd = NULL;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001694 struct cfg80211_registered_device *drv = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001695 struct wiphy *request_wiphy;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001696 /* Some basic sanity checks first */
1697
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001698 if (is_world_regdom(rd->alpha2)) {
Johannes Bergf6037d02008-10-21 11:01:33 +02001699 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001700 return -EINVAL;
1701 update_world_regdomain(rd);
1702 return 0;
1703 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001704
1705 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1706 !is_unknown_alpha2(rd->alpha2))
1707 return -EINVAL;
1708
Johannes Bergf6037d02008-10-21 11:01:33 +02001709 if (!last_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001710 return -EINVAL;
1711
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001712 /*
1713 * Lets only bother proceeding on the same alpha2 if the current
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001714 * rd is non static (it means CRDA was present and was used last)
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001715 * and the pending request came in from a country IE
1716 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001717 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001718 /*
1719 * If someone else asked us to change the rd lets only bother
1720 * checking if the alpha2 changes if CRDA was already called
1721 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001722 if (!is_old_static_regdom(cfg80211_regdomain) &&
1723 !regdom_changed(rd->alpha2))
1724 return -EINVAL;
1725 }
1726
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001727 /*
1728 * Now lets set the regulatory domain, update all driver channels
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001729 * and finally inform them of what we have done, in case they want
1730 * to review or adjust their own settings based on their own
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001731 * internal EEPROM data
1732 */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001733
Johannes Bergf6037d02008-10-21 11:01:33 +02001734 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001735 return -EINVAL;
1736
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08001737 if (!is_valid_rd(rd)) {
1738 printk(KERN_ERR "cfg80211: Invalid "
1739 "regulatory domain detected:\n");
1740 print_regdomain_info(rd);
1741 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001742 }
1743
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001744 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1745
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001746 if (!last_request->intersect) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001747 int r;
1748
1749 if (last_request->initiator != REGDOM_SET_BY_DRIVER) {
1750 reset_regdomains();
1751 cfg80211_regdomain = rd;
1752 return 0;
1753 }
1754
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001755 /*
1756 * For a driver hint, lets copy the regulatory domain the
1757 * driver wanted to the wiphy to deal with conflicts
1758 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001759
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001760 BUG_ON(request_wiphy->regd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001761
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001762 r = reg_copy_regd(&request_wiphy->regd, rd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001763 if (r)
1764 return r;
1765
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001766 reset_regdomains();
1767 cfg80211_regdomain = rd;
1768 return 0;
1769 }
1770
1771 /* Intersection requires a bit more work */
1772
1773 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1774
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001775 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1776 if (!intersected_rd)
1777 return -EINVAL;
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001778
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001779 /*
1780 * We can trash what CRDA provided now.
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001781 * However if a driver requested this specific regulatory
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001782 * domain we keep it for its private use
1783 */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001784 if (last_request->initiator == REGDOM_SET_BY_DRIVER)
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001785 request_wiphy->regd = rd;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001786 else
1787 kfree(rd);
1788
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001789 rd = NULL;
1790
1791 reset_regdomains();
1792 cfg80211_regdomain = intersected_rd;
1793
1794 return 0;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001795 }
1796
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001797 /*
1798 * Country IE requests are handled a bit differently, we intersect
1799 * the country IE rd with what CRDA believes that country should have
1800 */
1801
1802 BUG_ON(!country_ie_regdomain);
1803
1804 if (rd != country_ie_regdomain) {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001805 /*
1806 * Intersect what CRDA returned and our what we
1807 * had built from the Country IE received
1808 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001809
1810 intersected_rd = regdom_intersect(rd, country_ie_regdomain);
1811
1812 reg_country_ie_process_debug(rd, country_ie_regdomain,
1813 intersected_rd);
1814
1815 kfree(country_ie_regdomain);
1816 country_ie_regdomain = NULL;
1817 } else {
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001818 /*
1819 * This would happen when CRDA was not present and
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001820 * OLD_REGULATORY was enabled. We intersect our Country
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001821 * IE rd and what was set on cfg80211 originally
1822 */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001823 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1824 }
1825
1826 if (!intersected_rd)
1827 return -EINVAL;
1828
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001829 drv = wiphy_to_dev(request_wiphy);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001830
1831 drv->country_ie_alpha2[0] = rd->alpha2[0];
1832 drv->country_ie_alpha2[1] = rd->alpha2[1];
1833 drv->env = last_request->country_ie_env;
1834
1835 BUG_ON(intersected_rd == rd);
1836
1837 kfree(rd);
1838 rd = NULL;
1839
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001840 reset_regdomains();
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001841 cfg80211_regdomain = intersected_rd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001842
1843 return 0;
1844}
1845
1846
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001847/*
1848 * Use this call to set the current regulatory domain. Conflicts with
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001849 * multiple drivers can be ironed out later. Caller must've already
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001850 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
1851 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001852int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001853{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001854 int r;
1855
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001856 assert_cfg80211_lock();
1857
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001858 /* Note that this doesn't update the wiphys, this is done below */
1859 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +02001860 if (r) {
1861 kfree(rd);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001862 return r;
Johannes Bergd2372b32008-10-24 20:32:20 +02001863 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001864
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001865 /* This would make this whole thing pointless */
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08001866 if (!last_request->intersect)
1867 BUG_ON(rd != cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001868
1869 /* update all wiphys now with the new established regulatory domain */
Johannes Bergf6037d02008-10-21 11:01:33 +02001870 update_all_wiphy_regulatory(last_request->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001871
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08001872 print_regdomain(cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001873
1874 return r;
1875}
1876
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001877/* Caller must hold cfg80211_mutex */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001878void reg_device_remove(struct wiphy *wiphy)
1879{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001880 struct wiphy *request_wiphy;
1881
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001882 assert_cfg80211_lock();
1883
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001884 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1885
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001886 kfree(wiphy->regd);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001887 if (!last_request || !request_wiphy)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001888 return;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001889 if (request_wiphy != wiphy)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001890 return;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001891 last_request->wiphy_idx = WIPHY_IDX_STALE;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001892 last_request->country_ie_env = ENVIRON_ANY;
1893}
1894
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001895int regulatory_init(void)
1896{
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05001897 int err = 0;
Johannes Berg734366d2008-09-15 10:56:48 +02001898
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001899 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
1900 if (IS_ERR(reg_pdev))
1901 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02001902
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001903 spin_lock_init(&reg_requests_lock);
1904
Johannes Berg734366d2008-09-15 10:56:48 +02001905#ifdef CONFIG_WIRELESS_OLD_REGULATORY
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001906 cfg80211_regdomain = static_regdom(ieee80211_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +02001907
Johannes Berg942b25c2008-09-15 11:26:47 +02001908 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
Johannes Berg734366d2008-09-15 10:56:48 +02001909 print_regdomain_info(cfg80211_regdomain);
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001910 /*
1911 * The old code still requests for a new regdomain and if
Johannes Berg734366d2008-09-15 10:56:48 +02001912 * you have CRDA you get it updated, otherwise you get
1913 * stuck with the static values. We ignore "EU" code as
Luis R. Rodriguezfb1fc7a2009-02-21 00:04:31 -05001914 * that is not a valid ISO / IEC 3166 alpha2
1915 */
Johannes Bergac9440a2008-10-21 11:08:27 +02001916 if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001917 err = regulatory_hint_core(ieee80211_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +02001918#else
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001919 cfg80211_regdomain = cfg80211_world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +02001920
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001921 err = regulatory_hint_core("00");
Johannes Berg734366d2008-09-15 10:56:48 +02001922#endif
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05001923 if (err) {
1924 if (err == -ENOMEM)
1925 return err;
1926 /*
1927 * N.B. kobject_uevent_env() can fail mainly for when we're out
1928 * memory which is handled and propagated appropriately above
1929 * but it can also fail during a netlink_broadcast() or during
1930 * early boot for call_usermodehelper(). For now treat these
1931 * errors as non-fatal.
1932 */
1933 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
1934 "to call CRDA during init");
1935#ifdef CONFIG_CFG80211_REG_DEBUG
1936 /* We want to find out exactly why when debugging */
1937 WARN_ON(err);
1938#endif
1939 }
Johannes Berg734366d2008-09-15 10:56:48 +02001940
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001941 return 0;
1942}
1943
1944void regulatory_exit(void)
1945{
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001946 struct regulatory_request *reg_request, *tmp;
1947
1948 cancel_work_sync(&reg_work);
1949
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001950 mutex_lock(&cfg80211_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +02001951
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001952 reset_regdomains();
Johannes Berg734366d2008-09-15 10:56:48 +02001953
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001954 kfree(country_ie_regdomain);
1955 country_ie_regdomain = NULL;
1956
Johannes Bergf6037d02008-10-21 11:01:33 +02001957 kfree(last_request);
1958
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001959 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02001960
Luis R. Rodriguezfe33eb32009-02-21 00:04:30 -05001961 spin_lock(&reg_requests_lock);
1962 if (!list_empty(&reg_requests_list)) {
1963 list_for_each_entry_safe(reg_request, tmp,
1964 &reg_requests_list, list) {
1965 list_del(&reg_request->list);
1966 kfree(reg_request);
1967 }
1968 }
1969 spin_unlock(&reg_requests_lock);
1970
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001971 mutex_unlock(&cfg80211_mutex);
Johannes Berg8318d782008-01-24 19:38:38 +01001972}