blob: c201abd38ad145dd78ed4914af4603cd7b9faec4 [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/**
46 * struct regulatory_request - receipt of last regulatory request
47 *
48 * @wiphy: this is set if this request's initiator is
49 * %REGDOM_SET_BY_COUNTRY_IE or %REGDOM_SET_BY_DRIVER. This
50 * can be used by the wireless core to deal with conflicts
51 * and potentially inform users of which devices specifically
52 * cased the conflicts.
53 * @initiator: indicates who sent this request, could be any of
54 * of those set in reg_set_by, %REGDOM_SET_BY_*
55 * @alpha2: the ISO / IEC 3166 alpha2 country code of the requested
56 * regulatory domain. We have a few special codes:
57 * 00 - World regulatory domain
58 * 99 - built by driver but a specific alpha2 cannot be determined
59 * 98 - result of an intersection between two regulatory domains
60 * @intersect: indicates whether the wireless core should intersect
61 * the requested regulatory domain with the presently set regulatory
62 * domain.
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -080063 * @country_ie_checksum: checksum of the last processed and accepted
64 * country IE
65 * @country_ie_env: lets us know if the AP is telling us we are outdoor,
66 * indoor, or if it doesn't matter
Johannes Bergbe3d4812008-10-24 20:32:21 +020067 */
Johannes Berg734366d2008-09-15 10:56:48 +020068struct regulatory_request {
Johannes Berg734366d2008-09-15 10:56:48 +020069 struct wiphy *wiphy;
Johannes Berg734366d2008-09-15 10:56:48 +020070 enum reg_set_by initiator;
71 char alpha2[2];
Luis R. Rodriguez9c964772008-10-30 13:33:53 -070072 bool intersect;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -080073 u32 country_ie_checksum;
74 enum environment_cap country_ie_env;
Johannes Berg734366d2008-09-15 10:56:48 +020075};
76
Luis R. Rodriguez5166ccd2008-10-30 13:33:56 -070077/* Receipt of information from last regulatory request */
Johannes Bergf6037d02008-10-21 11:01:33 +020078static struct regulatory_request *last_request;
Johannes Berg734366d2008-09-15 10:56:48 +020079
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070080/* To trigger userspace events */
81static struct platform_device *reg_pdev;
Johannes Berg8318d782008-01-24 19:38:38 +010082
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070083/* Keep the ordering from large to small */
84static u32 supported_bandwidths[] = {
85 MHZ_TO_KHZ(40),
86 MHZ_TO_KHZ(20),
Johannes Berg8318d782008-01-24 19:38:38 +010087};
88
Johannes Berg734366d2008-09-15 10:56:48 +020089/* Central wireless core regulatory domains, we only need two,
90 * the current one and a world regulatory domain in case we have no
91 * information to give us an alpha2 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +020092static const struct ieee80211_regdomain *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +020093
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -080094/* We use this as a place for the rd structure built from the
95 * last parsed country IE to rest until CRDA gets back to us with
96 * what it thinks should apply for the same country */
97static const struct ieee80211_regdomain *country_ie_regdomain;
98
Johannes Berg734366d2008-09-15 10:56:48 +020099/* We keep a static world regulatory domain in case of the absence of CRDA */
100static const struct ieee80211_regdomain world_regdom = {
101 .n_reg_rules = 1,
102 .alpha2 = "00",
103 .reg_rules = {
104 REG_RULE(2412-10, 2462+10, 40, 6, 20,
105 NL80211_RRF_PASSIVE_SCAN |
106 NL80211_RRF_NO_IBSS),
107 }
108};
109
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200110static const struct ieee80211_regdomain *cfg80211_world_regdom =
111 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200112
113#ifdef CONFIG_WIRELESS_OLD_REGULATORY
114static char *ieee80211_regdom = "US";
115module_param(ieee80211_regdom, charp, 0444);
116MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
117
118/* We assume 40 MHz bandwidth for the old regulatory work.
119 * We make emphasis we are using the exact same frequencies
120 * as before */
121
122static const struct ieee80211_regdomain us_regdom = {
123 .n_reg_rules = 6,
124 .alpha2 = "US",
125 .reg_rules = {
126 /* IEEE 802.11b/g, channels 1..11 */
127 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
128 /* IEEE 802.11a, channel 36 */
129 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
130 /* IEEE 802.11a, channel 40 */
131 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
132 /* IEEE 802.11a, channel 44 */
133 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
134 /* IEEE 802.11a, channels 48..64 */
135 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
136 /* IEEE 802.11a, channels 149..165, outdoor */
137 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
138 }
139};
140
141static const struct ieee80211_regdomain jp_regdom = {
142 .n_reg_rules = 3,
143 .alpha2 = "JP",
144 .reg_rules = {
145 /* IEEE 802.11b/g, channels 1..14 */
146 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
147 /* IEEE 802.11a, channels 34..48 */
148 REG_RULE(5170-10, 5240+10, 40, 6, 20,
149 NL80211_RRF_PASSIVE_SCAN),
150 /* IEEE 802.11a, channels 52..64 */
151 REG_RULE(5260-10, 5320+10, 40, 6, 20,
152 NL80211_RRF_NO_IBSS |
153 NL80211_RRF_DFS),
154 }
155};
156
157static const struct ieee80211_regdomain eu_regdom = {
158 .n_reg_rules = 6,
159 /* This alpha2 is bogus, we leave it here just for stupid
160 * backward compatibility */
161 .alpha2 = "EU",
162 .reg_rules = {
163 /* IEEE 802.11b/g, channels 1..13 */
164 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
165 /* IEEE 802.11a, channel 36 */
166 REG_RULE(5180-10, 5180+10, 40, 6, 23,
167 NL80211_RRF_PASSIVE_SCAN),
168 /* IEEE 802.11a, channel 40 */
169 REG_RULE(5200-10, 5200+10, 40, 6, 23,
170 NL80211_RRF_PASSIVE_SCAN),
171 /* IEEE 802.11a, channel 44 */
172 REG_RULE(5220-10, 5220+10, 40, 6, 23,
173 NL80211_RRF_PASSIVE_SCAN),
174 /* IEEE 802.11a, channels 48..64 */
175 REG_RULE(5240-10, 5320+10, 40, 6, 20,
176 NL80211_RRF_NO_IBSS |
177 NL80211_RRF_DFS),
178 /* IEEE 802.11a, channels 100..140 */
179 REG_RULE(5500-10, 5700+10, 40, 6, 30,
180 NL80211_RRF_NO_IBSS |
181 NL80211_RRF_DFS),
182 }
183};
184
185static const struct ieee80211_regdomain *static_regdom(char *alpha2)
186{
187 if (alpha2[0] == 'U' && alpha2[1] == 'S')
188 return &us_regdom;
189 if (alpha2[0] == 'J' && alpha2[1] == 'P')
190 return &jp_regdom;
191 if (alpha2[0] == 'E' && alpha2[1] == 'U')
192 return &eu_regdom;
193 /* Default, as per the old rules */
194 return &us_regdom;
195}
196
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200197static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200198{
199 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
200 return true;
201 return false;
202}
Johannes Berg734366d2008-09-15 10:56:48 +0200203#else
Johannes Berg942b25c2008-09-15 11:26:47 +0200204static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
205{
206 return false;
207}
208#endif
209
Johannes Berg734366d2008-09-15 10:56:48 +0200210static void reset_regdomains(void)
211{
Johannes Berg942b25c2008-09-15 11:26:47 +0200212 /* avoid freeing static information or freeing something twice */
213 if (cfg80211_regdomain == cfg80211_world_regdom)
214 cfg80211_regdomain = NULL;
215 if (cfg80211_world_regdom == &world_regdom)
216 cfg80211_world_regdom = NULL;
217 if (cfg80211_regdomain == &world_regdom)
218 cfg80211_regdomain = NULL;
219 if (is_old_static_regdom(cfg80211_regdomain))
220 cfg80211_regdomain = NULL;
221
222 kfree(cfg80211_regdomain);
223 kfree(cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200224
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200225 cfg80211_world_regdom = &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200226 cfg80211_regdomain = NULL;
227}
228
229/* Dynamic world regulatory domain requested by the wireless
230 * core upon initialization */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200231static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200232{
Johannes Bergf6037d02008-10-21 11:01:33 +0200233 BUG_ON(!last_request);
Johannes Berg734366d2008-09-15 10:56:48 +0200234
235 reset_regdomains();
236
237 cfg80211_world_regdom = rd;
238 cfg80211_regdomain = rd;
239}
Johannes Berg734366d2008-09-15 10:56:48 +0200240
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200241bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100242{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700243 if (!alpha2)
244 return false;
245 if (alpha2[0] == '0' && alpha2[1] == '0')
246 return true;
247 return false;
Johannes Berg8318d782008-01-24 19:38:38 +0100248}
249
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200250static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700251{
252 if (!alpha2)
253 return false;
254 if (alpha2[0] != 0 && alpha2[1] != 0)
255 return true;
256 return false;
257}
Johannes Berg8318d782008-01-24 19:38:38 +0100258
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700259static bool is_alpha_upper(char letter)
260{
261 /* ASCII A - Z */
262 if (letter >= 65 && letter <= 90)
263 return true;
264 return false;
265}
266
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200267static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700268{
269 if (!alpha2)
270 return false;
271 /* Special case where regulatory domain was built by driver
272 * but a specific alpha2 cannot be determined */
273 if (alpha2[0] == '9' && alpha2[1] == '9')
274 return true;
275 return false;
276}
277
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800278static bool is_intersected_alpha2(const char *alpha2)
279{
280 if (!alpha2)
281 return false;
282 /* Special case where regulatory domain is the
283 * result of an intersection between two regulatory domain
284 * structures */
285 if (alpha2[0] == '9' && alpha2[1] == '8')
286 return true;
287 return false;
288}
289
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200290static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700291{
292 if (!alpha2)
293 return false;
294 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
295 return true;
296 return false;
297}
298
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200299static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700300{
301 if (!alpha2_x || !alpha2_y)
302 return false;
303 if (alpha2_x[0] == alpha2_y[0] &&
304 alpha2_x[1] == alpha2_y[1])
305 return true;
306 return false;
307}
308
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200309static bool regdom_changed(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700310{
311 if (!cfg80211_regdomain)
312 return true;
313 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
314 return false;
315 return true;
316}
317
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800318/**
319 * country_ie_integrity_changes - tells us if the country IE has changed
320 * @checksum: checksum of country IE of fields we are interested in
321 *
322 * If the country IE has not changed you can ignore it safely. This is
323 * useful to determine if two devices are seeing two different country IEs
324 * even on the same alpha2. Note that this will return false if no IE has
325 * been set on the wireless core yet.
326 */
327static bool country_ie_integrity_changes(u32 checksum)
328{
329 /* If no IE has been set then the checksum doesn't change */
330 if (unlikely(!last_request->country_ie_checksum))
331 return false;
332 if (unlikely(last_request->country_ie_checksum != checksum))
333 return true;
334 return false;
335}
336
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700337/* This lets us keep regulatory code which is updated on a regulatory
338 * basis in userspace. */
339static int call_crda(const char *alpha2)
340{
341 char country_env[9 + 2] = "COUNTRY=";
342 char *envp[] = {
343 country_env,
344 NULL
345 };
346
347 if (!is_world_regdom((char *) alpha2))
348 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
349 alpha2[0], alpha2[1]);
350 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700351 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
352 "regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700353
354 country_env[8] = alpha2[0];
355 country_env[9] = alpha2[1];
356
357 return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
358}
359
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700360/* Used by nl80211 before kmalloc'ing our regulatory domain */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200361bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700362{
Johannes Bergf6037d02008-10-21 11:01:33 +0200363 if (!last_request)
364 return false;
365
366 return alpha2_equal(last_request->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700367}
368
369/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200370static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700371{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200372 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700373 u32 freq_diff;
374
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800375 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700376 return false;
377
378 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
379 return false;
380
381 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
382
Luis R. Rodriguezd71aaf62008-10-30 13:33:52 -0700383 if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700384 return false;
385
386 return true;
387}
388
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200389static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700390{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200391 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700392 unsigned int i;
393
394 if (!rd->n_reg_rules)
395 return false;
396
Luis R. Rodriguez88dc1c32008-11-12 14:22:01 -0800397 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
398 return false;
399
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700400 for (i = 0; i < rd->n_reg_rules; i++) {
401 reg_rule = &rd->reg_rules[i];
402 if (!is_valid_reg_rule(reg_rule))
403 return false;
404 }
405
406 return true;
407}
408
409/* Returns value in KHz */
410static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
411 u32 freq)
412{
413 unsigned int i;
414 for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
415 u32 start_freq_khz = freq - supported_bandwidths[i]/2;
416 u32 end_freq_khz = freq + supported_bandwidths[i]/2;
417 if (start_freq_khz >= freq_range->start_freq_khz &&
418 end_freq_khz <= freq_range->end_freq_khz)
419 return supported_bandwidths[i];
420 }
421 return 0;
422}
423
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800424/**
425 * freq_in_rule_band - tells us if a frequency is in a frequency band
426 * @freq_range: frequency rule we want to query
427 * @freq_khz: frequency we are inquiring about
428 *
429 * This lets us know if a specific frequency rule is or is not relevant to
430 * a specific frequency's band. Bands are device specific and artificial
431 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
432 * safe for now to assume that a frequency rule should not be part of a
433 * frequency's band if the start freq or end freq are off by more than 2 GHz.
434 * This resolution can be lowered and should be considered as we add
435 * regulatory rule support for other "bands".
436 **/
437static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
438 u32 freq_khz)
439{
440#define ONE_GHZ_IN_KHZ 1000000
441 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
442 return true;
443 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
444 return true;
445 return false;
446#undef ONE_GHZ_IN_KHZ
447}
448
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800449/* Converts a country IE to a regulatory domain. A regulatory domain
450 * structure has a lot of information which the IE doesn't yet have,
451 * so for the other values we use upper max values as we will intersect
452 * with our userspace regulatory agent to get lower bounds. */
453static struct ieee80211_regdomain *country_ie_2_rd(
454 u8 *country_ie,
455 u8 country_ie_len,
456 u32 *checksum)
457{
458 struct ieee80211_regdomain *rd = NULL;
459 unsigned int i = 0;
460 char alpha2[2];
461 u32 flags = 0;
462 u32 num_rules = 0, size_of_regd = 0;
463 u8 *triplets_start = NULL;
464 u8 len_at_triplet = 0;
465 /* the last channel we have registered in a subband (triplet) */
466 int last_sub_max_channel = 0;
467
468 *checksum = 0xDEADBEEF;
469
470 /* Country IE requirements */
471 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
472 country_ie_len & 0x01);
473
474 alpha2[0] = country_ie[0];
475 alpha2[1] = country_ie[1];
476
477 /*
478 * Third octet can be:
479 * 'I' - Indoor
480 * 'O' - Outdoor
481 *
482 * anything else we assume is no restrictions
483 */
484 if (country_ie[2] == 'I')
485 flags = NL80211_RRF_NO_OUTDOOR;
486 else if (country_ie[2] == 'O')
487 flags = NL80211_RRF_NO_INDOOR;
488
489 country_ie += 3;
490 country_ie_len -= 3;
491
492 triplets_start = country_ie;
493 len_at_triplet = country_ie_len;
494
495 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
496
497 /* We need to build a reg rule for each triplet, but first we must
498 * calculate the number of reg rules we will need. We will need one
499 * for each channel subband */
500 while (country_ie_len >= 3) {
501 struct ieee80211_country_ie_triplet *triplet =
502 (struct ieee80211_country_ie_triplet *) country_ie;
503 int cur_sub_max_channel = 0, cur_channel = 0;
504
505 if (triplet->ext.reg_extension_id >=
506 IEEE80211_COUNTRY_EXTENSION_ID) {
507 country_ie += 3;
508 country_ie_len -= 3;
509 continue;
510 }
511
512 cur_channel = triplet->chans.first_channel;
513 cur_sub_max_channel = ieee80211_channel_to_frequency(
514 cur_channel + triplet->chans.num_channels);
515
516 /* Basic sanity check */
517 if (cur_sub_max_channel < cur_channel)
518 return NULL;
519
520 /* Do not allow overlapping channels. Also channels
521 * passed in each subband must be monotonically
522 * increasing */
523 if (last_sub_max_channel) {
524 if (cur_channel <= last_sub_max_channel)
525 return NULL;
526 if (cur_sub_max_channel <= last_sub_max_channel)
527 return NULL;
528 }
529
530 /* When dot11RegulatoryClassesRequired is supported
531 * we can throw ext triplets as part of this soup,
532 * for now we don't care when those change as we
533 * don't support them */
534 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
535 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
536 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
537
538 last_sub_max_channel = cur_sub_max_channel;
539
540 country_ie += 3;
541 country_ie_len -= 3;
542 num_rules++;
543
544 /* Note: this is not a IEEE requirement but
545 * simply a memory requirement */
546 if (num_rules > NL80211_MAX_SUPP_REG_RULES)
547 return NULL;
548 }
549
550 country_ie = triplets_start;
551 country_ie_len = len_at_triplet;
552
553 size_of_regd = sizeof(struct ieee80211_regdomain) +
554 (num_rules * sizeof(struct ieee80211_reg_rule));
555
556 rd = kzalloc(size_of_regd, GFP_KERNEL);
557 if (!rd)
558 return NULL;
559
560 rd->n_reg_rules = num_rules;
561 rd->alpha2[0] = alpha2[0];
562 rd->alpha2[1] = alpha2[1];
563
564 /* This time around we fill in the rd */
565 while (country_ie_len >= 3) {
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800566 int end_channel = 0;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800567 struct ieee80211_country_ie_triplet *triplet =
568 (struct ieee80211_country_ie_triplet *) country_ie;
569 struct ieee80211_reg_rule *reg_rule = NULL;
570 struct ieee80211_freq_range *freq_range = NULL;
571 struct ieee80211_power_rule *power_rule = NULL;
572
573 /* Must parse if dot11RegulatoryClassesRequired is true,
574 * we don't support this yet */
575 if (triplet->ext.reg_extension_id >=
576 IEEE80211_COUNTRY_EXTENSION_ID) {
577 country_ie += 3;
578 country_ie_len -= 3;
579 continue;
580 }
581
582 reg_rule = &rd->reg_rules[i];
583 freq_range = &reg_rule->freq_range;
584 power_rule = &reg_rule->power_rule;
585
586 reg_rule->flags = flags;
587
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800588 /* 2 GHz */
589 if (triplet->chans.first_channel <= 14)
590 end_channel = triplet->chans.first_channel +
591 triplet->chans.num_channels;
592 else
593 /*
594 * 5 GHz -- For example in country IEs if the first
595 * channel given is 36 and the number of channels is 4
596 * then the individual channel numbers defined for the
597 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
598 * and not 36, 37, 38, 39.
599 *
600 * See: http://tinyurl.com/11d-clarification
601 */
602 end_channel = triplet->chans.first_channel +
603 (4 * (triplet->chans.num_channels - 1));
604
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800605 /* The +10 is since the regulatory domain expects
606 * the actual band edge, not the center of freq for
607 * its start and end freqs, assuming 20 MHz bandwidth on
608 * the channels passed */
609 freq_range->start_freq_khz =
610 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
611 triplet->chans.first_channel) - 10);
612 freq_range->end_freq_khz =
613 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800614 end_channel) + 10);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800615
616 /* Large arbitrary values, we intersect later */
617 /* Increment this if we ever support >= 40 MHz channels
618 * in IEEE 802.11 */
619 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
620 power_rule->max_antenna_gain = DBI_TO_MBI(100);
621 power_rule->max_eirp = DBM_TO_MBM(100);
622
623 country_ie += 3;
624 country_ie_len -= 3;
625 i++;
626
627 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
628 }
629
630 return rd;
631}
632
633
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700634/* Helper for regdom_intersect(), this does the real
635 * mathematical intersection fun */
636static int reg_rules_intersect(
637 const struct ieee80211_reg_rule *rule1,
638 const struct ieee80211_reg_rule *rule2,
639 struct ieee80211_reg_rule *intersected_rule)
640{
641 const struct ieee80211_freq_range *freq_range1, *freq_range2;
642 struct ieee80211_freq_range *freq_range;
643 const struct ieee80211_power_rule *power_rule1, *power_rule2;
644 struct ieee80211_power_rule *power_rule;
645 u32 freq_diff;
646
647 freq_range1 = &rule1->freq_range;
648 freq_range2 = &rule2->freq_range;
649 freq_range = &intersected_rule->freq_range;
650
651 power_rule1 = &rule1->power_rule;
652 power_rule2 = &rule2->power_rule;
653 power_rule = &intersected_rule->power_rule;
654
655 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
656 freq_range2->start_freq_khz);
657 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
658 freq_range2->end_freq_khz);
659 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
660 freq_range2->max_bandwidth_khz);
661
662 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
663 if (freq_range->max_bandwidth_khz > freq_diff)
664 freq_range->max_bandwidth_khz = freq_diff;
665
666 power_rule->max_eirp = min(power_rule1->max_eirp,
667 power_rule2->max_eirp);
668 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
669 power_rule2->max_antenna_gain);
670
671 intersected_rule->flags = (rule1->flags | rule2->flags);
672
673 if (!is_valid_reg_rule(intersected_rule))
674 return -EINVAL;
675
676 return 0;
677}
678
679/**
680 * regdom_intersect - do the intersection between two regulatory domains
681 * @rd1: first regulatory domain
682 * @rd2: second regulatory domain
683 *
684 * Use this function to get the intersection between two regulatory domains.
685 * Once completed we will mark the alpha2 for the rd as intersected, "98",
686 * as no one single alpha2 can represent this regulatory domain.
687 *
688 * Returns a pointer to the regulatory domain structure which will hold the
689 * resulting intersection of rules between rd1 and rd2. We will
690 * kzalloc() this structure for you.
691 */
692static struct ieee80211_regdomain *regdom_intersect(
693 const struct ieee80211_regdomain *rd1,
694 const struct ieee80211_regdomain *rd2)
695{
696 int r, size_of_regd;
697 unsigned int x, y;
698 unsigned int num_rules = 0, rule_idx = 0;
699 const struct ieee80211_reg_rule *rule1, *rule2;
700 struct ieee80211_reg_rule *intersected_rule;
701 struct ieee80211_regdomain *rd;
702 /* This is just a dummy holder to help us count */
703 struct ieee80211_reg_rule irule;
704
705 /* Uses the stack temporarily for counter arithmetic */
706 intersected_rule = &irule;
707
708 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
709
710 if (!rd1 || !rd2)
711 return NULL;
712
713 /* First we get a count of the rules we'll need, then we actually
714 * build them. This is to so we can malloc() and free() a
715 * regdomain once. The reason we use reg_rules_intersect() here
716 * is it will return -EINVAL if the rule computed makes no sense.
717 * All rules that do check out OK are valid. */
718
719 for (x = 0; x < rd1->n_reg_rules; x++) {
720 rule1 = &rd1->reg_rules[x];
721 for (y = 0; y < rd2->n_reg_rules; y++) {
722 rule2 = &rd2->reg_rules[y];
723 if (!reg_rules_intersect(rule1, rule2,
724 intersected_rule))
725 num_rules++;
726 memset(intersected_rule, 0,
727 sizeof(struct ieee80211_reg_rule));
728 }
729 }
730
731 if (!num_rules)
732 return NULL;
733
734 size_of_regd = sizeof(struct ieee80211_regdomain) +
735 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
736
737 rd = kzalloc(size_of_regd, GFP_KERNEL);
738 if (!rd)
739 return NULL;
740
741 for (x = 0; x < rd1->n_reg_rules; x++) {
742 rule1 = &rd1->reg_rules[x];
743 for (y = 0; y < rd2->n_reg_rules; y++) {
744 rule2 = &rd2->reg_rules[y];
745 /* This time around instead of using the stack lets
746 * write to the target rule directly saving ourselves
747 * a memcpy() */
748 intersected_rule = &rd->reg_rules[rule_idx];
749 r = reg_rules_intersect(rule1, rule2,
750 intersected_rule);
751 /* No need to memset here the intersected rule here as
752 * we're not using the stack anymore */
753 if (r)
754 continue;
755 rule_idx++;
756 }
757 }
758
759 if (rule_idx != num_rules) {
760 kfree(rd);
761 return NULL;
762 }
763
764 rd->n_reg_rules = num_rules;
765 rd->alpha2[0] = '9';
766 rd->alpha2[1] = '8';
767
768 return rd;
769}
770
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700771/* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
772 * want to just have the channel structure use these */
773static u32 map_regdom_flags(u32 rd_flags)
774{
775 u32 channel_flags = 0;
776 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
777 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
778 if (rd_flags & NL80211_RRF_NO_IBSS)
779 channel_flags |= IEEE80211_CHAN_NO_IBSS;
780 if (rd_flags & NL80211_RRF_DFS)
781 channel_flags |= IEEE80211_CHAN_RADAR;
782 return channel_flags;
783}
784
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800785static int freq_reg_info_regd(struct wiphy *wiphy,
786 u32 center_freq,
787 u32 *bandwidth,
788 const struct ieee80211_reg_rule **reg_rule,
789 const struct ieee80211_regdomain *custom_regd)
Johannes Berg8318d782008-01-24 19:38:38 +0100790{
791 int i;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800792 bool band_rule_found = false;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800793 const struct ieee80211_regdomain *regd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700794 u32 max_bandwidth = 0;
Johannes Berg8318d782008-01-24 19:38:38 +0100795
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800796 regd = custom_regd ? custom_regd : cfg80211_regdomain;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800797
798 /* Follow the driver's regulatory domain, if present, unless a country
799 * IE has been processed */
800 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
801 wiphy->regd)
802 regd = wiphy->regd;
803
804 if (!regd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700805 return -EINVAL;
806
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800807 for (i = 0; i < regd->n_reg_rules; i++) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700808 const struct ieee80211_reg_rule *rr;
809 const struct ieee80211_freq_range *fr = NULL;
810 const struct ieee80211_power_rule *pr = NULL;
811
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800812 rr = &regd->reg_rules[i];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700813 fr = &rr->freq_range;
814 pr = &rr->power_rule;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800815
816 /* We only need to know if one frequency rule was
817 * was in center_freq's band, that's enough, so lets
818 * not overwrite it once found */
819 if (!band_rule_found)
820 band_rule_found = freq_in_rule_band(fr, center_freq);
821
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700822 max_bandwidth = freq_max_bandwidth(fr, center_freq);
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800823
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700824 if (max_bandwidth && *bandwidth <= max_bandwidth) {
825 *reg_rule = rr;
826 *bandwidth = max_bandwidth;
Johannes Berg8318d782008-01-24 19:38:38 +0100827 break;
828 }
829 }
830
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800831 if (!band_rule_found)
832 return -ERANGE;
833
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700834 return !max_bandwidth;
835}
Luis R. Rodriguez34f57342009-01-22 15:05:45 -0800836EXPORT_SYMBOL(freq_reg_info);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700837
Luis R. Rodriguez34f57342009-01-22 15:05:45 -0800838int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800839 const struct ieee80211_reg_rule **reg_rule)
840{
841 return freq_reg_info_regd(wiphy, center_freq,
842 bandwidth, reg_rule, NULL);
843}
844
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800845static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
846 unsigned int chan_idx)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700847{
848 int r;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800849 u32 flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700850 u32 max_bandwidth = 0;
851 const struct ieee80211_reg_rule *reg_rule = NULL;
852 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800853 struct ieee80211_supported_band *sband;
854 struct ieee80211_channel *chan;
855
856 sband = wiphy->bands[band];
857 BUG_ON(chan_idx >= sband->n_channels);
858 chan = &sband->channels[chan_idx];
859
860 flags = chan->orig_flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700861
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800862 r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq),
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700863 &max_bandwidth, &reg_rule);
864
865 if (r) {
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800866 /* This means no regulatory rule was found in the country IE
867 * with a frequency range on the center_freq's band, since
868 * IEEE-802.11 allows for a country IE to have a subset of the
869 * regulatory information provided in a country we ignore
870 * disabling the channel unless at least one reg rule was
871 * found on the center_freq's band. For details see this
872 * clarification:
873 *
874 * http://tinyurl.com/11d-clarification
875 */
876 if (r == -ERANGE &&
877 last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
878#ifdef CONFIG_CFG80211_REG_DEBUG
879 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
880 "intact on %s - no rule found in band on "
881 "Country IE\n",
882 chan->center_freq, wiphy_name(wiphy));
883#endif
884 } else {
885 /* In this case we know the country IE has at least one reg rule
886 * for the band so we respect its band definitions */
887#ifdef CONFIG_CFG80211_REG_DEBUG
888 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
889 printk(KERN_DEBUG "cfg80211: Disabling "
890 "channel %d MHz on %s due to "
891 "Country IE\n",
892 chan->center_freq, wiphy_name(wiphy));
893#endif
894 flags |= IEEE80211_CHAN_DISABLED;
895 chan->flags = flags;
896 }
Johannes Berg8318d782008-01-24 19:38:38 +0100897 return;
898 }
899
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700900 power_rule = &reg_rule->power_rule;
901
902 chan->flags = flags | map_regdom_flags(reg_rule->flags);
Johannes Berg8318d782008-01-24 19:38:38 +0100903 chan->max_antenna_gain = min(chan->orig_mag,
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700904 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
905 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
John W. Linville253898c2008-04-03 15:32:54 -0400906 if (chan->orig_mpwr)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700907 chan->max_power = min(chan->orig_mpwr,
908 (int) MBM_TO_DBM(power_rule->max_eirp));
John W. Linville253898c2008-04-03 15:32:54 -0400909 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700910 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
Johannes Berg8318d782008-01-24 19:38:38 +0100911}
912
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800913static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
Johannes Berg8318d782008-01-24 19:38:38 +0100914{
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800915 unsigned int i;
916 struct ieee80211_supported_band *sband;
917
918 BUG_ON(!wiphy->bands[band]);
919 sband = wiphy->bands[band];
Johannes Berg8318d782008-01-24 19:38:38 +0100920
921 for (i = 0; i < sband->n_channels; i++)
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800922 handle_channel(wiphy, band, i);
Johannes Berg8318d782008-01-24 19:38:38 +0100923}
924
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800925static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby)
926{
927 if (!last_request)
928 return true;
929 if (setby == REGDOM_SET_BY_CORE &&
930 wiphy->fw_handles_regulatory)
931 return true;
932 return false;
933}
934
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700935static void update_all_wiphy_regulatory(enum reg_set_by setby)
936{
937 struct cfg80211_registered_device *drv;
938
939 list_for_each_entry(drv, &cfg80211_drv_list, list)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800940 if (!ignore_reg_update(&drv->wiphy, setby))
941 wiphy_update_regulatory(&drv->wiphy, setby);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700942}
943
944void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
Johannes Berg8318d782008-01-24 19:38:38 +0100945{
946 enum ieee80211_band band;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700947 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Johannes Berg8318d782008-01-24 19:38:38 +0100948 if (wiphy->bands[band])
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800949 handle_band(wiphy, band);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700950 }
Luis R. Rodriguez560e28e2009-01-07 17:43:32 -0800951 if (wiphy->reg_notifier)
952 wiphy->reg_notifier(wiphy, setby);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700953}
954
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800955static void handle_channel_custom(struct wiphy *wiphy,
956 enum ieee80211_band band,
957 unsigned int chan_idx,
958 const struct ieee80211_regdomain *regd)
959{
960 int r;
961 u32 max_bandwidth = 0;
962 const struct ieee80211_reg_rule *reg_rule = NULL;
963 const struct ieee80211_power_rule *power_rule = NULL;
964 struct ieee80211_supported_band *sband;
965 struct ieee80211_channel *chan;
966
967 sband = wiphy->bands[band];
968 BUG_ON(chan_idx >= sband->n_channels);
969 chan = &sband->channels[chan_idx];
970
971 r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
972 &max_bandwidth, &reg_rule, regd);
973
974 if (r) {
975 chan->flags = IEEE80211_CHAN_DISABLED;
976 return;
977 }
978
979 power_rule = &reg_rule->power_rule;
980
981 chan->flags |= map_regdom_flags(reg_rule->flags);
982 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
983 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
984 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
985}
986
987static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
988 const struct ieee80211_regdomain *regd)
989{
990 unsigned int i;
991 struct ieee80211_supported_band *sband;
992
993 BUG_ON(!wiphy->bands[band]);
994 sband = wiphy->bands[band];
995
996 for (i = 0; i < sband->n_channels; i++)
997 handle_channel_custom(wiphy, band, i, regd);
998}
999
1000/* Used by drivers prior to wiphy registration */
1001void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1002 const struct ieee80211_regdomain *regd)
1003{
1004 enum ieee80211_band band;
1005 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1006 if (wiphy->bands[band])
1007 handle_band_custom(wiphy, band, regd);
1008 }
1009}
1010EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1011
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001012static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
1013 const struct ieee80211_regdomain *src_regd)
1014{
1015 struct ieee80211_regdomain *regd;
1016 int size_of_regd = 0;
1017 unsigned int i;
1018
1019 size_of_regd = sizeof(struct ieee80211_regdomain) +
1020 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
1021
1022 regd = kzalloc(size_of_regd, GFP_KERNEL);
1023 if (!regd)
1024 return -ENOMEM;
1025
1026 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
1027
1028 for (i = 0; i < src_regd->n_reg_rules; i++)
1029 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
1030 sizeof(struct ieee80211_reg_rule));
1031
1032 *dst_regd = regd;
1033 return 0;
1034}
1035
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001036/* Return value which can be used by ignore_request() to indicate
1037 * it has been determined we should intersect two regulatory domains */
1038#define REG_INTERSECT 1
1039
Johannes Berg84fa4f42008-10-24 20:32:23 +02001040/* This has the logic which determines when a new request
1041 * should be ignored. */
1042static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
1043 const char *alpha2)
1044{
1045 /* All initial requests are respected */
1046 if (!last_request)
1047 return 0;
1048
1049 switch (set_by) {
1050 case REGDOM_SET_BY_INIT:
1051 return -EINVAL;
1052 case REGDOM_SET_BY_CORE:
1053 /*
1054 * Always respect new wireless core hints, should only happen
1055 * when updating the world regulatory domain at init.
1056 */
1057 return 0;
1058 case REGDOM_SET_BY_COUNTRY_IE:
1059 if (unlikely(!is_an_alpha2(alpha2)))
1060 return -EINVAL;
1061 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
1062 if (last_request->wiphy != wiphy) {
1063 /*
1064 * Two cards with two APs claiming different
1065 * different Country IE alpha2s. We could
1066 * intersect them, but that seems unlikely
1067 * to be correct. Reject second one for now.
1068 */
1069 if (!alpha2_equal(alpha2,
1070 cfg80211_regdomain->alpha2))
1071 return -EOPNOTSUPP;
1072 return -EALREADY;
1073 }
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001074 /* Two consecutive Country IE hints on the same wiphy.
1075 * This should be picked up early by the driver/stack */
1076 if (WARN_ON(!alpha2_equal(cfg80211_regdomain->alpha2,
1077 alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001078 return 0;
1079 return -EALREADY;
1080 }
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001081 return REG_INTERSECT;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001082 case REGDOM_SET_BY_DRIVER:
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001083 if (last_request->initiator == REGDOM_SET_BY_CORE) {
1084 if (is_old_static_regdom(cfg80211_regdomain))
1085 return 0;
1086 if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
1087 return 0;
1088 return -EALREADY;
1089 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001090 return REG_INTERSECT;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001091 case REGDOM_SET_BY_USER:
Johannes Berg84fa4f42008-10-24 20:32:23 +02001092 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001093 return REG_INTERSECT;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001094 /* If the user knows better the user should set the regdom
1095 * to their country before the IE is picked up */
1096 if (last_request->initiator == REGDOM_SET_BY_USER &&
1097 last_request->intersect)
1098 return -EOPNOTSUPP;
Luis R. Rodriguez5eebade2009-01-22 15:05:47 -08001099 /* Process user requests only after previous user/driver/core
1100 * requests have been processed */
1101 if (last_request->initiator == REGDOM_SET_BY_CORE ||
1102 last_request->initiator == REGDOM_SET_BY_DRIVER ||
1103 last_request->initiator == REGDOM_SET_BY_USER) {
1104 if (!alpha2_equal(last_request->alpha2,
1105 cfg80211_regdomain->alpha2))
1106 return -EAGAIN;
1107 }
1108
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001109 if (!is_old_static_regdom(cfg80211_regdomain) &&
1110 alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
1111 return -EALREADY;
1112
Johannes Berg84fa4f42008-10-24 20:32:23 +02001113 return 0;
1114 }
1115
1116 return -EINVAL;
1117}
1118
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001119/* Caller must hold &cfg80211_drv_mutex */
1120int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001121 const char *alpha2,
1122 u32 country_ie_checksum,
1123 enum environment_cap env)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001124{
1125 struct regulatory_request *request;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001126 bool intersect = false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001127 int r = 0;
1128
Johannes Bergbe3d4812008-10-24 20:32:21 +02001129 r = ignore_request(wiphy, set_by, alpha2);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001130
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001131 if (r == REG_INTERSECT) {
1132 if (set_by == REGDOM_SET_BY_DRIVER) {
1133 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1134 if (r)
1135 return r;
1136 }
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001137 intersect = true;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001138 } else if (r) {
1139 /* If the regulatory domain being requested by the
1140 * driver has already been set just copy it to the
1141 * wiphy */
1142 if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) {
1143 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1144 if (r)
1145 return r;
1146 r = -EALREADY;
1147 goto new_request;
1148 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001149 return r;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001150 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001151
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001152new_request:
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001153 request = kzalloc(sizeof(struct regulatory_request),
1154 GFP_KERNEL);
1155 if (!request)
1156 return -ENOMEM;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001157
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001158 request->alpha2[0] = alpha2[0];
1159 request->alpha2[1] = alpha2[1];
1160 request->initiator = set_by;
1161 request->wiphy = wiphy;
1162 request->intersect = intersect;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001163 request->country_ie_checksum = country_ie_checksum;
1164 request->country_ie_env = env;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001165
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001166 kfree(last_request);
1167 last_request = request;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001168
1169 /* When r == REG_INTERSECT we do need to call CRDA */
1170 if (r < 0)
1171 return r;
1172
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001173 /*
1174 * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
1175 * AND if CRDA is NOT present nothing will happen, if someone
1176 * wants to bother with 11d with OLD_REG you can add a timer.
1177 * If after x amount of time nothing happens you can call:
1178 *
1179 * return set_regdom(country_ie_regdomain);
1180 *
1181 * to intersect with the static rd
1182 */
Luis R. Rodriguez02ba0b32008-11-12 14:22:00 -08001183 return call_crda(alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001184}
1185
Johannes Bergbe3d4812008-10-24 20:32:21 +02001186void regulatory_hint(struct wiphy *wiphy, const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001187{
Johannes Bergbe3d4812008-10-24 20:32:21 +02001188 BUG_ON(!alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001189
1190 mutex_lock(&cfg80211_drv_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001191 __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, 0, ENVIRON_ANY);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001192 mutex_unlock(&cfg80211_drv_mutex);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001193}
1194EXPORT_SYMBOL(regulatory_hint);
1195
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001196static bool reg_same_country_ie_hint(struct wiphy *wiphy,
1197 u32 country_ie_checksum)
1198{
1199 if (!last_request->wiphy)
1200 return false;
1201 if (likely(last_request->wiphy != wiphy))
1202 return !country_ie_integrity_changes(country_ie_checksum);
1203 /* We should not have let these through at this point, they
1204 * should have been picked up earlier by the first alpha2 check
1205 * on the device */
1206 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
1207 return true;
1208 return false;
1209}
1210
1211void regulatory_hint_11d(struct wiphy *wiphy,
1212 u8 *country_ie,
1213 u8 country_ie_len)
1214{
1215 struct ieee80211_regdomain *rd = NULL;
1216 char alpha2[2];
1217 u32 checksum = 0;
1218 enum environment_cap env = ENVIRON_ANY;
1219
Johannes Berg0f70f392008-12-01 18:13:05 +01001220 if (!last_request)
1221 return;
1222
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001223 mutex_lock(&cfg80211_drv_mutex);
1224
1225 /* IE len must be evenly divisible by 2 */
1226 if (country_ie_len & 0x01)
1227 goto out;
1228
1229 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1230 goto out;
1231
1232 /* Pending country IE processing, this can happen after we
1233 * call CRDA and wait for a response if a beacon was received before
1234 * we were able to process the last regulatory_hint_11d() call */
1235 if (country_ie_regdomain)
1236 goto out;
1237
1238 alpha2[0] = country_ie[0];
1239 alpha2[1] = country_ie[1];
1240
1241 if (country_ie[2] == 'I')
1242 env = ENVIRON_INDOOR;
1243 else if (country_ie[2] == 'O')
1244 env = ENVIRON_OUTDOOR;
1245
1246 /* We will run this for *every* beacon processed for the BSSID, so
1247 * we optimize an early check to exit out early if we don't have to
1248 * do anything */
1249 if (likely(last_request->wiphy)) {
1250 struct cfg80211_registered_device *drv_last_ie;
1251
1252 drv_last_ie = wiphy_to_dev(last_request->wiphy);
1253
1254 /* Lets keep this simple -- we trust the first AP
1255 * after we intersect with CRDA */
1256 if (likely(last_request->wiphy == wiphy)) {
1257 /* Ignore IEs coming in on this wiphy with
1258 * the same alpha2 and environment cap */
1259 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1260 alpha2) &&
1261 env == drv_last_ie->env)) {
1262 goto out;
1263 }
1264 /* the wiphy moved on to another BSSID or the AP
1265 * was reconfigured. XXX: We need to deal with the
1266 * case where the user suspends and goes to goes
1267 * to another country, and then gets IEs from an
1268 * AP with different settings */
1269 goto out;
1270 } else {
1271 /* Ignore IEs coming in on two separate wiphys with
1272 * the same alpha2 and environment cap */
1273 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1274 alpha2) &&
1275 env == drv_last_ie->env)) {
1276 goto out;
1277 }
1278 /* We could potentially intersect though */
1279 goto out;
1280 }
1281 }
1282
1283 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
1284 if (!rd)
1285 goto out;
1286
1287 /* This will not happen right now but we leave it here for the
1288 * the future when we want to add suspend/resume support and having
1289 * the user move to another country after doing so, or having the user
1290 * move to another AP. Right now we just trust the first AP. This is why
1291 * this is marked as likley(). If we hit this before we add this support
1292 * we want to be informed of it as it would indicate a mistake in the
1293 * current design */
1294 if (likely(WARN_ON(reg_same_country_ie_hint(wiphy, checksum))))
1295 goto out;
1296
1297 /* We keep this around for when CRDA comes back with a response so
1298 * we can intersect with that */
1299 country_ie_regdomain = rd;
1300
1301 __regulatory_hint(wiphy, REGDOM_SET_BY_COUNTRY_IE,
1302 country_ie_regdomain->alpha2, checksum, env);
1303
1304out:
1305 mutex_unlock(&cfg80211_drv_mutex);
1306}
1307EXPORT_SYMBOL(regulatory_hint_11d);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001308
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001309static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001310{
1311 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001312 const struct ieee80211_reg_rule *reg_rule = NULL;
1313 const struct ieee80211_freq_range *freq_range = NULL;
1314 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001315
1316 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
1317 "(max_antenna_gain, max_eirp)\n");
1318
1319 for (i = 0; i < rd->n_reg_rules; i++) {
1320 reg_rule = &rd->reg_rules[i];
1321 freq_range = &reg_rule->freq_range;
1322 power_rule = &reg_rule->power_rule;
1323
1324 /* There may not be documentation for max antenna gain
1325 * in certain regions */
1326 if (power_rule->max_antenna_gain)
1327 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1328 "(%d mBi, %d mBm)\n",
1329 freq_range->start_freq_khz,
1330 freq_range->end_freq_khz,
1331 freq_range->max_bandwidth_khz,
1332 power_rule->max_antenna_gain,
1333 power_rule->max_eirp);
1334 else
1335 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1336 "(N/A, %d mBm)\n",
1337 freq_range->start_freq_khz,
1338 freq_range->end_freq_khz,
1339 freq_range->max_bandwidth_khz,
1340 power_rule->max_eirp);
1341 }
1342}
1343
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001344static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001345{
1346
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001347 if (is_intersected_alpha2(rd->alpha2)) {
1348 struct wiphy *wiphy = NULL;
1349 struct cfg80211_registered_device *drv;
1350
1351 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
1352 if (last_request->wiphy) {
1353 wiphy = last_request->wiphy;
1354 drv = wiphy_to_dev(wiphy);
1355 printk(KERN_INFO "cfg80211: Current regulatory "
1356 "domain updated by AP to: %c%c\n",
1357 drv->country_ie_alpha2[0],
1358 drv->country_ie_alpha2[1]);
1359 } else
1360 printk(KERN_INFO "cfg80211: Current regulatory "
1361 "domain intersected: \n");
1362 } else
1363 printk(KERN_INFO "cfg80211: Current regulatory "
Luis R. Rodriguez039498c2009-01-07 17:43:35 -08001364 "domain intersected: \n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001365 } else if (is_world_regdom(rd->alpha2))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001366 printk(KERN_INFO "cfg80211: World regulatory "
1367 "domain updated:\n");
1368 else {
1369 if (is_unknown_alpha2(rd->alpha2))
1370 printk(KERN_INFO "cfg80211: Regulatory domain "
1371 "changed to driver built-in settings "
1372 "(unknown country)\n");
1373 else
1374 printk(KERN_INFO "cfg80211: Regulatory domain "
1375 "changed to country: %c%c\n",
1376 rd->alpha2[0], rd->alpha2[1]);
1377 }
1378 print_rd_rules(rd);
1379}
1380
Johannes Berg2df78162008-10-28 16:49:41 +01001381static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001382{
1383 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1384 rd->alpha2[0], rd->alpha2[1]);
1385 print_rd_rules(rd);
1386}
1387
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001388#ifdef CONFIG_CFG80211_REG_DEBUG
1389static void reg_country_ie_process_debug(
1390 const struct ieee80211_regdomain *rd,
1391 const struct ieee80211_regdomain *country_ie_regdomain,
1392 const struct ieee80211_regdomain *intersected_rd)
1393{
1394 printk(KERN_DEBUG "cfg80211: Received country IE:\n");
1395 print_regdomain_info(country_ie_regdomain);
1396 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
1397 print_regdomain_info(rd);
1398 if (intersected_rd) {
1399 printk(KERN_DEBUG "cfg80211: We intersect both of these "
1400 "and get:\n");
1401 print_regdomain_info(rd);
1402 return;
1403 }
1404 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
1405}
1406#else
1407static inline void reg_country_ie_process_debug(
1408 const struct ieee80211_regdomain *rd,
1409 const struct ieee80211_regdomain *country_ie_regdomain,
1410 const struct ieee80211_regdomain *intersected_rd)
1411{
1412}
1413#endif
1414
Johannes Bergd2372b32008-10-24 20:32:20 +02001415/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001416static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001417{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001418 const struct ieee80211_regdomain *intersected_rd = NULL;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001419 struct cfg80211_registered_device *drv = NULL;
1420 struct wiphy *wiphy = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001421 /* Some basic sanity checks first */
1422
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001423 if (is_world_regdom(rd->alpha2)) {
Johannes Bergf6037d02008-10-21 11:01:33 +02001424 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001425 return -EINVAL;
1426 update_world_regdomain(rd);
1427 return 0;
1428 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001429
1430 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1431 !is_unknown_alpha2(rd->alpha2))
1432 return -EINVAL;
1433
Johannes Bergf6037d02008-10-21 11:01:33 +02001434 if (!last_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001435 return -EINVAL;
1436
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001437 /* Lets only bother proceeding on the same alpha2 if the current
1438 * rd is non static (it means CRDA was present and was used last)
1439 * and the pending request came in from a country IE */
1440 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1441 /* If someone else asked us to change the rd lets only bother
1442 * checking if the alpha2 changes if CRDA was already called */
1443 if (!is_old_static_regdom(cfg80211_regdomain) &&
1444 !regdom_changed(rd->alpha2))
1445 return -EINVAL;
1446 }
1447
1448 wiphy = last_request->wiphy;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001449
1450 /* Now lets set the regulatory domain, update all driver channels
1451 * and finally inform them of what we have done, in case they want
1452 * to review or adjust their own settings based on their own
1453 * internal EEPROM data */
1454
Johannes Bergf6037d02008-10-21 11:01:33 +02001455 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001456 return -EINVAL;
1457
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08001458 if (!is_valid_rd(rd)) {
1459 printk(KERN_ERR "cfg80211: Invalid "
1460 "regulatory domain detected:\n");
1461 print_regdomain_info(rd);
1462 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001463 }
1464
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001465 if (!last_request->intersect) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001466 int r;
1467
1468 if (last_request->initiator != REGDOM_SET_BY_DRIVER) {
1469 reset_regdomains();
1470 cfg80211_regdomain = rd;
1471 return 0;
1472 }
1473
1474 /* For a driver hint, lets copy the regulatory domain the
1475 * driver wanted to the wiphy to deal with conflicts */
1476
1477 BUG_ON(last_request->wiphy->regd);
1478
1479 r = reg_copy_regd(&last_request->wiphy->regd, rd);
1480 if (r)
1481 return r;
1482
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001483 reset_regdomains();
1484 cfg80211_regdomain = rd;
1485 return 0;
1486 }
1487
1488 /* Intersection requires a bit more work */
1489
1490 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1491
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001492 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1493 if (!intersected_rd)
1494 return -EINVAL;
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001495
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001496 /* We can trash what CRDA provided now.
1497 * However if a driver requested this specific regulatory
1498 * domain we keep it for its private use */
1499 if (last_request->initiator == REGDOM_SET_BY_DRIVER)
1500 last_request->wiphy->regd = rd;
1501 else
1502 kfree(rd);
1503
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001504 rd = NULL;
1505
1506 reset_regdomains();
1507 cfg80211_regdomain = intersected_rd;
1508
1509 return 0;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001510 }
1511
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001512 /*
1513 * Country IE requests are handled a bit differently, we intersect
1514 * the country IE rd with what CRDA believes that country should have
1515 */
1516
1517 BUG_ON(!country_ie_regdomain);
1518
1519 if (rd != country_ie_regdomain) {
1520 /* Intersect what CRDA returned and our what we
1521 * had built from the Country IE received */
1522
1523 intersected_rd = regdom_intersect(rd, country_ie_regdomain);
1524
1525 reg_country_ie_process_debug(rd, country_ie_regdomain,
1526 intersected_rd);
1527
1528 kfree(country_ie_regdomain);
1529 country_ie_regdomain = NULL;
1530 } else {
1531 /* This would happen when CRDA was not present and
1532 * OLD_REGULATORY was enabled. We intersect our Country
1533 * IE rd and what was set on cfg80211 originally */
1534 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1535 }
1536
1537 if (!intersected_rd)
1538 return -EINVAL;
1539
1540 drv = wiphy_to_dev(wiphy);
1541
1542 drv->country_ie_alpha2[0] = rd->alpha2[0];
1543 drv->country_ie_alpha2[1] = rd->alpha2[1];
1544 drv->env = last_request->country_ie_env;
1545
1546 BUG_ON(intersected_rd == rd);
1547
1548 kfree(rd);
1549 rd = NULL;
1550
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001551 reset_regdomains();
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001552 cfg80211_regdomain = intersected_rd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001553
1554 return 0;
1555}
1556
1557
1558/* Use this call to set the current regulatory domain. Conflicts with
1559 * multiple drivers can be ironed out later. Caller must've already
Johannes Bergd2372b32008-10-24 20:32:20 +02001560 * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001561int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001562{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001563 int r;
1564
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001565 /* Note that this doesn't update the wiphys, this is done below */
1566 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +02001567 if (r) {
1568 kfree(rd);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001569 return r;
Johannes Bergd2372b32008-10-24 20:32:20 +02001570 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001571
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001572 /* This would make this whole thing pointless */
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08001573 if (!last_request->intersect)
1574 BUG_ON(rd != cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001575
1576 /* update all wiphys now with the new established regulatory domain */
Johannes Bergf6037d02008-10-21 11:01:33 +02001577 update_all_wiphy_regulatory(last_request->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001578
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08001579 print_regdomain(cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001580
1581 return r;
1582}
1583
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001584/* Caller must hold cfg80211_drv_mutex */
1585void reg_device_remove(struct wiphy *wiphy)
1586{
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001587 kfree(wiphy->regd);
Johannes Berg4a4f4d82008-12-01 12:07:56 +01001588 if (!last_request || !last_request->wiphy)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001589 return;
1590 if (last_request->wiphy != wiphy)
1591 return;
1592 last_request->wiphy = NULL;
1593 last_request->country_ie_env = ENVIRON_ANY;
1594}
1595
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001596int regulatory_init(void)
1597{
Johannes Berg734366d2008-09-15 10:56:48 +02001598 int err;
1599
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001600 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
1601 if (IS_ERR(reg_pdev))
1602 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02001603
1604#ifdef CONFIG_WIRELESS_OLD_REGULATORY
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001605 cfg80211_regdomain = static_regdom(ieee80211_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +02001606
Johannes Berg942b25c2008-09-15 11:26:47 +02001607 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
Johannes Berg734366d2008-09-15 10:56:48 +02001608 print_regdomain_info(cfg80211_regdomain);
1609 /* The old code still requests for a new regdomain and if
1610 * you have CRDA you get it updated, otherwise you get
1611 * stuck with the static values. We ignore "EU" code as
1612 * that is not a valid ISO / IEC 3166 alpha2 */
Johannes Bergac9440a2008-10-21 11:08:27 +02001613 if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
Johannes Berg734366d2008-09-15 10:56:48 +02001614 err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE,
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001615 ieee80211_regdom, 0, ENVIRON_ANY);
Johannes Berg734366d2008-09-15 10:56:48 +02001616#else
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001617 cfg80211_regdomain = cfg80211_world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +02001618
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001619 err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00", 0, ENVIRON_ANY);
Johannes Berg734366d2008-09-15 10:56:48 +02001620 if (err)
1621 printk(KERN_ERR "cfg80211: calling CRDA failed - "
1622 "unable to update world regulatory domain, "
1623 "using static definition\n");
1624#endif
1625
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001626 return 0;
1627}
1628
1629void regulatory_exit(void)
1630{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001631 mutex_lock(&cfg80211_drv_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +02001632
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001633 reset_regdomains();
Johannes Berg734366d2008-09-15 10:56:48 +02001634
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001635 kfree(country_ie_regdomain);
1636 country_ie_regdomain = NULL;
1637
Johannes Bergf6037d02008-10-21 11:01:33 +02001638 kfree(last_request);
1639
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001640 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02001641
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001642 mutex_unlock(&cfg80211_drv_mutex);
Johannes Berg8318d782008-01-24 19:38:38 +01001643}