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Johannes Berg8318d782008-01-24 19:38:38 +01001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07005 * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com>
Johannes Berg8318d782008-01-24 19:38:38 +01006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070012/**
13 * DOC: Wireless regulatory infrastructure
Johannes Berg8318d782008-01-24 19:38:38 +010014 *
15 * The usual implementation is for a driver to read a device EEPROM to
16 * determine which regulatory domain it should be operating under, then
17 * looking up the allowable channels in a driver-local table and finally
18 * registering those channels in the wiphy structure.
19 *
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070020 * Another set of compliance enforcement is for drivers to use their
21 * own compliance limits which can be stored on the EEPROM. The host
22 * driver or firmware may ensure these are used.
23 *
24 * In addition to all this we provide an extra layer of regulatory
25 * conformance. For drivers which do not have any regulatory
26 * information CRDA provides the complete regulatory solution.
27 * For others it provides a community effort on further restrictions
28 * to enhance compliance.
29 *
30 * Note: When number of rules --> infinity we will not be able to
31 * index on alpha2 any more, instead we'll probably have to
32 * rely on some SHA1 checksum of the regdomain for example.
33 *
Johannes Berg8318d782008-01-24 19:38:38 +010034 */
35#include <linux/kernel.h>
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
Johannes Berg734366d2008-09-15 10:56:48 +020057/* Central wireless core regulatory domains, we only need two,
58 * the current one and a world regulatory domain in case we have no
59 * information to give us an alpha2 */
Luis R. Rodriguezf1303472009-01-30 09:26:42 -080060const struct ieee80211_regdomain *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +020061
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -080062/* We use this as a place for the rd structure built from the
63 * last parsed country IE to rest until CRDA gets back to us with
64 * what it thinks should apply for the same country */
65static const struct ieee80211_regdomain *country_ie_regdomain;
66
Johannes Berg734366d2008-09-15 10:56:48 +020067/* We keep a static world regulatory domain in case of the absence of CRDA */
68static const struct ieee80211_regdomain world_regdom = {
69 .n_reg_rules = 1,
70 .alpha2 = "00",
71 .reg_rules = {
72 REG_RULE(2412-10, 2462+10, 40, 6, 20,
73 NL80211_RRF_PASSIVE_SCAN |
74 NL80211_RRF_NO_IBSS),
75 }
76};
77
Johannes Berga3d2eaf2008-09-15 11:10:52 +020078static const struct ieee80211_regdomain *cfg80211_world_regdom =
79 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +020080
81#ifdef CONFIG_WIRELESS_OLD_REGULATORY
82static char *ieee80211_regdom = "US";
83module_param(ieee80211_regdom, charp, 0444);
84MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
85
86/* We assume 40 MHz bandwidth for the old regulatory work.
87 * We make emphasis we are using the exact same frequencies
88 * as before */
89
90static const struct ieee80211_regdomain us_regdom = {
91 .n_reg_rules = 6,
92 .alpha2 = "US",
93 .reg_rules = {
94 /* IEEE 802.11b/g, channels 1..11 */
95 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
96 /* IEEE 802.11a, channel 36 */
97 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
98 /* IEEE 802.11a, channel 40 */
99 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
100 /* IEEE 802.11a, channel 44 */
101 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
102 /* IEEE 802.11a, channels 48..64 */
103 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
104 /* IEEE 802.11a, channels 149..165, outdoor */
105 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
106 }
107};
108
109static const struct ieee80211_regdomain jp_regdom = {
110 .n_reg_rules = 3,
111 .alpha2 = "JP",
112 .reg_rules = {
113 /* IEEE 802.11b/g, channels 1..14 */
114 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
115 /* IEEE 802.11a, channels 34..48 */
116 REG_RULE(5170-10, 5240+10, 40, 6, 20,
117 NL80211_RRF_PASSIVE_SCAN),
118 /* IEEE 802.11a, channels 52..64 */
119 REG_RULE(5260-10, 5320+10, 40, 6, 20,
120 NL80211_RRF_NO_IBSS |
121 NL80211_RRF_DFS),
122 }
123};
124
125static const struct ieee80211_regdomain eu_regdom = {
126 .n_reg_rules = 6,
127 /* This alpha2 is bogus, we leave it here just for stupid
128 * backward compatibility */
129 .alpha2 = "EU",
130 .reg_rules = {
131 /* IEEE 802.11b/g, channels 1..13 */
132 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
133 /* IEEE 802.11a, channel 36 */
134 REG_RULE(5180-10, 5180+10, 40, 6, 23,
135 NL80211_RRF_PASSIVE_SCAN),
136 /* IEEE 802.11a, channel 40 */
137 REG_RULE(5200-10, 5200+10, 40, 6, 23,
138 NL80211_RRF_PASSIVE_SCAN),
139 /* IEEE 802.11a, channel 44 */
140 REG_RULE(5220-10, 5220+10, 40, 6, 23,
141 NL80211_RRF_PASSIVE_SCAN),
142 /* IEEE 802.11a, channels 48..64 */
143 REG_RULE(5240-10, 5320+10, 40, 6, 20,
144 NL80211_RRF_NO_IBSS |
145 NL80211_RRF_DFS),
146 /* IEEE 802.11a, channels 100..140 */
147 REG_RULE(5500-10, 5700+10, 40, 6, 30,
148 NL80211_RRF_NO_IBSS |
149 NL80211_RRF_DFS),
150 }
151};
152
153static const struct ieee80211_regdomain *static_regdom(char *alpha2)
154{
155 if (alpha2[0] == 'U' && alpha2[1] == 'S')
156 return &us_regdom;
157 if (alpha2[0] == 'J' && alpha2[1] == 'P')
158 return &jp_regdom;
159 if (alpha2[0] == 'E' && alpha2[1] == 'U')
160 return &eu_regdom;
161 /* Default, as per the old rules */
162 return &us_regdom;
163}
164
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200165static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200166{
167 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
168 return true;
169 return false;
170}
Johannes Berg734366d2008-09-15 10:56:48 +0200171#else
Johannes Berg942b25c2008-09-15 11:26:47 +0200172static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
173{
174 return false;
175}
176#endif
177
Johannes Berg734366d2008-09-15 10:56:48 +0200178static void reset_regdomains(void)
179{
Johannes Berg942b25c2008-09-15 11:26:47 +0200180 /* avoid freeing static information or freeing something twice */
181 if (cfg80211_regdomain == cfg80211_world_regdom)
182 cfg80211_regdomain = NULL;
183 if (cfg80211_world_regdom == &world_regdom)
184 cfg80211_world_regdom = NULL;
185 if (cfg80211_regdomain == &world_regdom)
186 cfg80211_regdomain = NULL;
187 if (is_old_static_regdom(cfg80211_regdomain))
188 cfg80211_regdomain = NULL;
189
190 kfree(cfg80211_regdomain);
191 kfree(cfg80211_world_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200192
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200193 cfg80211_world_regdom = &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200194 cfg80211_regdomain = NULL;
195}
196
197/* Dynamic world regulatory domain requested by the wireless
198 * core upon initialization */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200199static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200200{
Johannes Bergf6037d02008-10-21 11:01:33 +0200201 BUG_ON(!last_request);
Johannes Berg734366d2008-09-15 10:56:48 +0200202
203 reset_regdomains();
204
205 cfg80211_world_regdom = rd;
206 cfg80211_regdomain = rd;
207}
Johannes Berg734366d2008-09-15 10:56:48 +0200208
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200209bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100210{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700211 if (!alpha2)
212 return false;
213 if (alpha2[0] == '0' && alpha2[1] == '0')
214 return true;
215 return false;
Johannes Berg8318d782008-01-24 19:38:38 +0100216}
217
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200218static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700219{
220 if (!alpha2)
221 return false;
222 if (alpha2[0] != 0 && alpha2[1] != 0)
223 return true;
224 return false;
225}
Johannes Berg8318d782008-01-24 19:38:38 +0100226
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700227static bool is_alpha_upper(char letter)
228{
229 /* ASCII A - Z */
230 if (letter >= 65 && letter <= 90)
231 return true;
232 return false;
233}
234
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200235static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700236{
237 if (!alpha2)
238 return false;
239 /* Special case where regulatory domain was built by driver
240 * but a specific alpha2 cannot be determined */
241 if (alpha2[0] == '9' && alpha2[1] == '9')
242 return true;
243 return false;
244}
245
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800246static bool is_intersected_alpha2(const char *alpha2)
247{
248 if (!alpha2)
249 return false;
250 /* Special case where regulatory domain is the
251 * result of an intersection between two regulatory domain
252 * structures */
253 if (alpha2[0] == '9' && alpha2[1] == '8')
254 return true;
255 return false;
256}
257
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200258static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700259{
260 if (!alpha2)
261 return false;
262 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
263 return true;
264 return false;
265}
266
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200267static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700268{
269 if (!alpha2_x || !alpha2_y)
270 return false;
271 if (alpha2_x[0] == alpha2_y[0] &&
272 alpha2_x[1] == alpha2_y[1])
273 return true;
274 return false;
275}
276
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200277static bool regdom_changed(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700278{
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500279 assert_cfg80211_lock();
280
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700281 if (!cfg80211_regdomain)
282 return true;
283 if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
284 return false;
285 return true;
286}
287
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800288/**
289 * country_ie_integrity_changes - tells us if the country IE has changed
290 * @checksum: checksum of country IE of fields we are interested in
291 *
292 * If the country IE has not changed you can ignore it safely. This is
293 * useful to determine if two devices are seeing two different country IEs
294 * even on the same alpha2. Note that this will return false if no IE has
295 * been set on the wireless core yet.
296 */
297static bool country_ie_integrity_changes(u32 checksum)
298{
299 /* If no IE has been set then the checksum doesn't change */
300 if (unlikely(!last_request->country_ie_checksum))
301 return false;
302 if (unlikely(last_request->country_ie_checksum != checksum))
303 return true;
304 return false;
305}
306
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700307/* This lets us keep regulatory code which is updated on a regulatory
308 * basis in userspace. */
309static int call_crda(const char *alpha2)
310{
311 char country_env[9 + 2] = "COUNTRY=";
312 char *envp[] = {
313 country_env,
314 NULL
315 };
316
317 if (!is_world_regdom((char *) alpha2))
318 printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
319 alpha2[0], alpha2[1]);
320 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700321 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
322 "regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700323
324 country_env[8] = alpha2[0];
325 country_env[9] = alpha2[1];
326
327 return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
328}
329
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700330/* Used by nl80211 before kmalloc'ing our regulatory domain */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200331bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700332{
Johannes Bergf6037d02008-10-21 11:01:33 +0200333 if (!last_request)
334 return false;
335
336 return alpha2_equal(last_request->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700337}
338
339/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200340static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700341{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200342 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700343 u32 freq_diff;
344
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800345 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700346 return false;
347
348 if (freq_range->start_freq_khz > freq_range->end_freq_khz)
349 return false;
350
351 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
352
Luis R. Rodriguezd71aaf62008-10-30 13:33:52 -0700353 if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700354 return false;
355
356 return true;
357}
358
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200359static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700360{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200361 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700362 unsigned int i;
363
364 if (!rd->n_reg_rules)
365 return false;
366
Luis R. Rodriguez88dc1c32008-11-12 14:22:01 -0800367 if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
368 return false;
369
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700370 for (i = 0; i < rd->n_reg_rules; i++) {
371 reg_rule = &rd->reg_rules[i];
372 if (!is_valid_reg_rule(reg_rule))
373 return false;
374 }
375
376 return true;
377}
378
379/* Returns value in KHz */
380static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
381 u32 freq)
382{
383 unsigned int i;
384 for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
385 u32 start_freq_khz = freq - supported_bandwidths[i]/2;
386 u32 end_freq_khz = freq + supported_bandwidths[i]/2;
387 if (start_freq_khz >= freq_range->start_freq_khz &&
388 end_freq_khz <= freq_range->end_freq_khz)
389 return supported_bandwidths[i];
390 }
391 return 0;
392}
393
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800394/**
395 * freq_in_rule_band - tells us if a frequency is in a frequency band
396 * @freq_range: frequency rule we want to query
397 * @freq_khz: frequency we are inquiring about
398 *
399 * This lets us know if a specific frequency rule is or is not relevant to
400 * a specific frequency's band. Bands are device specific and artificial
401 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
402 * safe for now to assume that a frequency rule should not be part of a
403 * frequency's band if the start freq or end freq are off by more than 2 GHz.
404 * This resolution can be lowered and should be considered as we add
405 * regulatory rule support for other "bands".
406 **/
407static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
408 u32 freq_khz)
409{
410#define ONE_GHZ_IN_KHZ 1000000
411 if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
412 return true;
413 if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
414 return true;
415 return false;
416#undef ONE_GHZ_IN_KHZ
417}
418
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800419/* Converts a country IE to a regulatory domain. A regulatory domain
420 * structure has a lot of information which the IE doesn't yet have,
421 * so for the other values we use upper max values as we will intersect
422 * with our userspace regulatory agent to get lower bounds. */
423static struct ieee80211_regdomain *country_ie_2_rd(
424 u8 *country_ie,
425 u8 country_ie_len,
426 u32 *checksum)
427{
428 struct ieee80211_regdomain *rd = NULL;
429 unsigned int i = 0;
430 char alpha2[2];
431 u32 flags = 0;
432 u32 num_rules = 0, size_of_regd = 0;
433 u8 *triplets_start = NULL;
434 u8 len_at_triplet = 0;
435 /* the last channel we have registered in a subband (triplet) */
436 int last_sub_max_channel = 0;
437
438 *checksum = 0xDEADBEEF;
439
440 /* Country IE requirements */
441 BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
442 country_ie_len & 0x01);
443
444 alpha2[0] = country_ie[0];
445 alpha2[1] = country_ie[1];
446
447 /*
448 * Third octet can be:
449 * 'I' - Indoor
450 * 'O' - Outdoor
451 *
452 * anything else we assume is no restrictions
453 */
454 if (country_ie[2] == 'I')
455 flags = NL80211_RRF_NO_OUTDOOR;
456 else if (country_ie[2] == 'O')
457 flags = NL80211_RRF_NO_INDOOR;
458
459 country_ie += 3;
460 country_ie_len -= 3;
461
462 triplets_start = country_ie;
463 len_at_triplet = country_ie_len;
464
465 *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
466
467 /* We need to build a reg rule for each triplet, but first we must
468 * calculate the number of reg rules we will need. We will need one
469 * for each channel subband */
470 while (country_ie_len >= 3) {
Luis R. Rodriguez615aab42009-01-22 15:05:46 -0800471 int end_channel = 0;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800472 struct ieee80211_country_ie_triplet *triplet =
473 (struct ieee80211_country_ie_triplet *) country_ie;
474 int cur_sub_max_channel = 0, cur_channel = 0;
475
476 if (triplet->ext.reg_extension_id >=
477 IEEE80211_COUNTRY_EXTENSION_ID) {
478 country_ie += 3;
479 country_ie_len -= 3;
480 continue;
481 }
482
Luis R. Rodriguez615aab42009-01-22 15:05:46 -0800483 /* 2 GHz */
484 if (triplet->chans.first_channel <= 14)
485 end_channel = triplet->chans.first_channel +
486 triplet->chans.num_channels;
487 else
488 /*
489 * 5 GHz -- For example in country IEs if the first
490 * channel given is 36 and the number of channels is 4
491 * then the individual channel numbers defined for the
492 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
493 * and not 36, 37, 38, 39.
494 *
495 * See: http://tinyurl.com/11d-clarification
496 */
497 end_channel = triplet->chans.first_channel +
498 (4 * (triplet->chans.num_channels - 1));
499
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800500 cur_channel = triplet->chans.first_channel;
Luis R. Rodriguez615aab42009-01-22 15:05:46 -0800501 cur_sub_max_channel = end_channel;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800502
503 /* Basic sanity check */
504 if (cur_sub_max_channel < cur_channel)
505 return NULL;
506
507 /* Do not allow overlapping channels. Also channels
508 * passed in each subband must be monotonically
509 * increasing */
510 if (last_sub_max_channel) {
511 if (cur_channel <= last_sub_max_channel)
512 return NULL;
513 if (cur_sub_max_channel <= last_sub_max_channel)
514 return NULL;
515 }
516
517 /* When dot11RegulatoryClassesRequired is supported
518 * we can throw ext triplets as part of this soup,
519 * for now we don't care when those change as we
520 * don't support them */
521 *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
522 ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
523 ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
524
525 last_sub_max_channel = cur_sub_max_channel;
526
527 country_ie += 3;
528 country_ie_len -= 3;
529 num_rules++;
530
531 /* Note: this is not a IEEE requirement but
532 * simply a memory requirement */
533 if (num_rules > NL80211_MAX_SUPP_REG_RULES)
534 return NULL;
535 }
536
537 country_ie = triplets_start;
538 country_ie_len = len_at_triplet;
539
540 size_of_regd = sizeof(struct ieee80211_regdomain) +
541 (num_rules * sizeof(struct ieee80211_reg_rule));
542
543 rd = kzalloc(size_of_regd, GFP_KERNEL);
544 if (!rd)
545 return NULL;
546
547 rd->n_reg_rules = num_rules;
548 rd->alpha2[0] = alpha2[0];
549 rd->alpha2[1] = alpha2[1];
550
551 /* This time around we fill in the rd */
552 while (country_ie_len >= 3) {
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800553 int end_channel = 0;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800554 struct ieee80211_country_ie_triplet *triplet =
555 (struct ieee80211_country_ie_triplet *) country_ie;
556 struct ieee80211_reg_rule *reg_rule = NULL;
557 struct ieee80211_freq_range *freq_range = NULL;
558 struct ieee80211_power_rule *power_rule = NULL;
559
560 /* Must parse if dot11RegulatoryClassesRequired is true,
561 * we don't support this yet */
562 if (triplet->ext.reg_extension_id >=
563 IEEE80211_COUNTRY_EXTENSION_ID) {
564 country_ie += 3;
565 country_ie_len -= 3;
566 continue;
567 }
568
569 reg_rule = &rd->reg_rules[i];
570 freq_range = &reg_rule->freq_range;
571 power_rule = &reg_rule->power_rule;
572
573 reg_rule->flags = flags;
574
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800575 /* 2 GHz */
576 if (triplet->chans.first_channel <= 14)
577 end_channel = triplet->chans.first_channel +
578 triplet->chans.num_channels;
579 else
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800580 end_channel = triplet->chans.first_channel +
581 (4 * (triplet->chans.num_channels - 1));
582
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800583 /* The +10 is since the regulatory domain expects
584 * the actual band edge, not the center of freq for
585 * its start and end freqs, assuming 20 MHz bandwidth on
586 * the channels passed */
587 freq_range->start_freq_khz =
588 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
589 triplet->chans.first_channel) - 10);
590 freq_range->end_freq_khz =
591 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
Luis R. Rodriguez02e68a32009-01-07 17:43:37 -0800592 end_channel) + 10);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -0800593
594 /* Large arbitrary values, we intersect later */
595 /* Increment this if we ever support >= 40 MHz channels
596 * in IEEE 802.11 */
597 freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
598 power_rule->max_antenna_gain = DBI_TO_MBI(100);
599 power_rule->max_eirp = DBM_TO_MBM(100);
600
601 country_ie += 3;
602 country_ie_len -= 3;
603 i++;
604
605 BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
606 }
607
608 return rd;
609}
610
611
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700612/* Helper for regdom_intersect(), this does the real
613 * mathematical intersection fun */
614static int reg_rules_intersect(
615 const struct ieee80211_reg_rule *rule1,
616 const struct ieee80211_reg_rule *rule2,
617 struct ieee80211_reg_rule *intersected_rule)
618{
619 const struct ieee80211_freq_range *freq_range1, *freq_range2;
620 struct ieee80211_freq_range *freq_range;
621 const struct ieee80211_power_rule *power_rule1, *power_rule2;
622 struct ieee80211_power_rule *power_rule;
623 u32 freq_diff;
624
625 freq_range1 = &rule1->freq_range;
626 freq_range2 = &rule2->freq_range;
627 freq_range = &intersected_rule->freq_range;
628
629 power_rule1 = &rule1->power_rule;
630 power_rule2 = &rule2->power_rule;
631 power_rule = &intersected_rule->power_rule;
632
633 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
634 freq_range2->start_freq_khz);
635 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
636 freq_range2->end_freq_khz);
637 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
638 freq_range2->max_bandwidth_khz);
639
640 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
641 if (freq_range->max_bandwidth_khz > freq_diff)
642 freq_range->max_bandwidth_khz = freq_diff;
643
644 power_rule->max_eirp = min(power_rule1->max_eirp,
645 power_rule2->max_eirp);
646 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
647 power_rule2->max_antenna_gain);
648
649 intersected_rule->flags = (rule1->flags | rule2->flags);
650
651 if (!is_valid_reg_rule(intersected_rule))
652 return -EINVAL;
653
654 return 0;
655}
656
657/**
658 * regdom_intersect - do the intersection between two regulatory domains
659 * @rd1: first regulatory domain
660 * @rd2: second regulatory domain
661 *
662 * Use this function to get the intersection between two regulatory domains.
663 * Once completed we will mark the alpha2 for the rd as intersected, "98",
664 * as no one single alpha2 can represent this regulatory domain.
665 *
666 * Returns a pointer to the regulatory domain structure which will hold the
667 * resulting intersection of rules between rd1 and rd2. We will
668 * kzalloc() this structure for you.
669 */
670static struct ieee80211_regdomain *regdom_intersect(
671 const struct ieee80211_regdomain *rd1,
672 const struct ieee80211_regdomain *rd2)
673{
674 int r, size_of_regd;
675 unsigned int x, y;
676 unsigned int num_rules = 0, rule_idx = 0;
677 const struct ieee80211_reg_rule *rule1, *rule2;
678 struct ieee80211_reg_rule *intersected_rule;
679 struct ieee80211_regdomain *rd;
680 /* This is just a dummy holder to help us count */
681 struct ieee80211_reg_rule irule;
682
683 /* Uses the stack temporarily for counter arithmetic */
684 intersected_rule = &irule;
685
686 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
687
688 if (!rd1 || !rd2)
689 return NULL;
690
691 /* First we get a count of the rules we'll need, then we actually
692 * build them. This is to so we can malloc() and free() a
693 * regdomain once. The reason we use reg_rules_intersect() here
694 * is it will return -EINVAL if the rule computed makes no sense.
695 * All rules that do check out OK are valid. */
696
697 for (x = 0; x < rd1->n_reg_rules; x++) {
698 rule1 = &rd1->reg_rules[x];
699 for (y = 0; y < rd2->n_reg_rules; y++) {
700 rule2 = &rd2->reg_rules[y];
701 if (!reg_rules_intersect(rule1, rule2,
702 intersected_rule))
703 num_rules++;
704 memset(intersected_rule, 0,
705 sizeof(struct ieee80211_reg_rule));
706 }
707 }
708
709 if (!num_rules)
710 return NULL;
711
712 size_of_regd = sizeof(struct ieee80211_regdomain) +
713 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
714
715 rd = kzalloc(size_of_regd, GFP_KERNEL);
716 if (!rd)
717 return NULL;
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 /* This time around instead of using the stack lets
724 * write to the target rule directly saving ourselves
725 * a memcpy() */
726 intersected_rule = &rd->reg_rules[rule_idx];
727 r = reg_rules_intersect(rule1, rule2,
728 intersected_rule);
729 /* No need to memset here the intersected rule here as
730 * we're not using the stack anymore */
731 if (r)
732 continue;
733 rule_idx++;
734 }
735 }
736
737 if (rule_idx != num_rules) {
738 kfree(rd);
739 return NULL;
740 }
741
742 rd->n_reg_rules = num_rules;
743 rd->alpha2[0] = '9';
744 rd->alpha2[1] = '8';
745
746 return rd;
747}
748
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700749/* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
750 * want to just have the channel structure use these */
751static u32 map_regdom_flags(u32 rd_flags)
752{
753 u32 channel_flags = 0;
754 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
755 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
756 if (rd_flags & NL80211_RRF_NO_IBSS)
757 channel_flags |= IEEE80211_CHAN_NO_IBSS;
758 if (rd_flags & NL80211_RRF_DFS)
759 channel_flags |= IEEE80211_CHAN_RADAR;
760 return channel_flags;
761}
762
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800763static int freq_reg_info_regd(struct wiphy *wiphy,
764 u32 center_freq,
765 u32 *bandwidth,
766 const struct ieee80211_reg_rule **reg_rule,
767 const struct ieee80211_regdomain *custom_regd)
Johannes Berg8318d782008-01-24 19:38:38 +0100768{
769 int i;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800770 bool band_rule_found = false;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800771 const struct ieee80211_regdomain *regd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700772 u32 max_bandwidth = 0;
Johannes Berg8318d782008-01-24 19:38:38 +0100773
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800774 regd = custom_regd ? custom_regd : cfg80211_regdomain;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800775
776 /* Follow the driver's regulatory domain, if present, unless a country
Luis R. Rodriguez24ed1da2009-01-22 15:05:54 -0800777 * IE has been processed or a user wants to help complaince further */
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800778 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
Luis R. Rodriguez24ed1da2009-01-22 15:05:54 -0800779 last_request->initiator != REGDOM_SET_BY_USER &&
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800780 wiphy->regd)
781 regd = wiphy->regd;
782
783 if (!regd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700784 return -EINVAL;
785
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800786 for (i = 0; i < regd->n_reg_rules; i++) {
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700787 const struct ieee80211_reg_rule *rr;
788 const struct ieee80211_freq_range *fr = NULL;
789 const struct ieee80211_power_rule *pr = NULL;
790
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800791 rr = &regd->reg_rules[i];
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700792 fr = &rr->freq_range;
793 pr = &rr->power_rule;
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800794
795 /* We only need to know if one frequency rule was
796 * was in center_freq's band, that's enough, so lets
797 * not overwrite it once found */
798 if (!band_rule_found)
799 band_rule_found = freq_in_rule_band(fr, center_freq);
800
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700801 max_bandwidth = freq_max_bandwidth(fr, center_freq);
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800802
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700803 if (max_bandwidth && *bandwidth <= max_bandwidth) {
804 *reg_rule = rr;
805 *bandwidth = max_bandwidth;
Johannes Berg8318d782008-01-24 19:38:38 +0100806 break;
807 }
808 }
809
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800810 if (!band_rule_found)
811 return -ERANGE;
812
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700813 return !max_bandwidth;
814}
Luis R. Rodriguez34f57342009-01-22 15:05:45 -0800815EXPORT_SYMBOL(freq_reg_info);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700816
Luis R. Rodriguez34f57342009-01-22 15:05:45 -0800817int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800818 const struct ieee80211_reg_rule **reg_rule)
819{
820 return freq_reg_info_regd(wiphy, center_freq,
821 bandwidth, reg_rule, NULL);
822}
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700823
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800824static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
825 unsigned int chan_idx)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700826{
827 int r;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800828 u32 flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700829 u32 max_bandwidth = 0;
830 const struct ieee80211_reg_rule *reg_rule = NULL;
831 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800832 struct ieee80211_supported_band *sband;
833 struct ieee80211_channel *chan;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500834 struct wiphy *request_wiphy;
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800835
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -0500836 assert_cfg80211_lock();
837
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500838 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
839
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800840 sband = wiphy->bands[band];
841 BUG_ON(chan_idx >= sband->n_channels);
842 chan = &sband->channels[chan_idx];
843
844 flags = chan->orig_flags;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700845
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -0800846 r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq),
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700847 &max_bandwidth, &reg_rule);
848
849 if (r) {
Luis R. Rodriguez0c7dc452009-01-07 17:43:36 -0800850 /* This means no regulatory rule was found in the country IE
851 * with a frequency range on the center_freq's band, since
852 * IEEE-802.11 allows for a country IE to have a subset of the
853 * regulatory information provided in a country we ignore
854 * disabling the channel unless at least one reg rule was
855 * found on the center_freq's band. For details see this
856 * clarification:
857 *
858 * http://tinyurl.com/11d-clarification
859 */
860 if (r == -ERANGE &&
861 last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
862#ifdef CONFIG_CFG80211_REG_DEBUG
863 printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
864 "intact on %s - no rule found in band on "
865 "Country IE\n",
866 chan->center_freq, wiphy_name(wiphy));
867#endif
868 } else {
869 /* In this case we know the country IE has at least one reg rule
870 * for the band so we respect its band definitions */
871#ifdef CONFIG_CFG80211_REG_DEBUG
872 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
873 printk(KERN_DEBUG "cfg80211: Disabling "
874 "channel %d MHz on %s due to "
875 "Country IE\n",
876 chan->center_freq, wiphy_name(wiphy));
877#endif
878 flags |= IEEE80211_CHAN_DISABLED;
879 chan->flags = flags;
880 }
Johannes Berg8318d782008-01-24 19:38:38 +0100881 return;
882 }
883
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700884 power_rule = &reg_rule->power_rule;
885
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800886 if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -0500887 request_wiphy && request_wiphy == wiphy &&
888 request_wiphy->strict_regulatory) {
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800889 /* This gaurantees the driver's requested regulatory domain
890 * will always be used as a base for further regulatory
891 * settings */
892 chan->flags = chan->orig_flags =
893 map_regdom_flags(reg_rule->flags);
894 chan->max_antenna_gain = chan->orig_mag =
895 (int) MBI_TO_DBI(power_rule->max_antenna_gain);
896 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
897 chan->max_power = chan->orig_mpwr =
898 (int) MBM_TO_DBM(power_rule->max_eirp);
899 return;
900 }
901
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700902 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 &&
Luis R. Rodriguez2a44f912009-01-22 15:05:49 -0800930 wiphy->custom_regulatory)
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800931 return true;
Luis R. Rodriguezf9763762009-01-22 15:05:52 -0800932 /* wiphy->regd will be set once the device has its own
933 * desired regulatory domain set */
934 if (wiphy->strict_regulatory && !wiphy->regd &&
935 !is_world_regdom(last_request->alpha2))
Luis R. Rodriguez14b98152008-11-12 14:22:03 -0800936 return true;
937 return false;
938}
939
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700940static void update_all_wiphy_regulatory(enum reg_set_by setby)
941{
942 struct cfg80211_registered_device *drv;
943
944 list_for_each_entry(drv, &cfg80211_drv_list, list)
Luis R. Rodriguezd46e5b12009-01-22 15:05:50 -0800945 wiphy_update_regulatory(&drv->wiphy, setby);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700946}
947
948void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
Johannes Berg8318d782008-01-24 19:38:38 +0100949{
950 enum ieee80211_band band;
Luis R. Rodriguezd46e5b12009-01-22 15:05:50 -0800951
952 if (ignore_reg_update(wiphy, setby))
953 return;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700954 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Johannes Berg8318d782008-01-24 19:38:38 +0100955 if (wiphy->bands[band])
Luis R. Rodrigueza92a3ce2009-01-07 17:43:33 -0800956 handle_band(wiphy, band);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700957 }
Luis R. Rodriguez560e28e2009-01-07 17:43:32 -0800958 if (wiphy->reg_notifier)
Luis R. Rodriguez716f9392009-01-22 15:05:51 -0800959 wiphy->reg_notifier(wiphy, last_request);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700960}
961
Luis R. Rodriguez1fa25e42009-01-22 15:05:44 -0800962static void handle_channel_custom(struct wiphy *wiphy,
963 enum ieee80211_band band,
964 unsigned int chan_idx,
965 const struct ieee80211_regdomain *regd)
966{
967 int r;
968 u32 max_bandwidth = 0;
969 const struct ieee80211_reg_rule *reg_rule = NULL;
970 const struct ieee80211_power_rule *power_rule = NULL;
971 struct ieee80211_supported_band *sband;
972 struct ieee80211_channel *chan;
973
974 sband = wiphy->bands[band];
975 BUG_ON(chan_idx >= sband->n_channels);
976 chan = &sband->channels[chan_idx];
977
978 r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
979 &max_bandwidth, &reg_rule, regd);
980
981 if (r) {
982 chan->flags = IEEE80211_CHAN_DISABLED;
983 return;
984 }
985
986 power_rule = &reg_rule->power_rule;
987
988 chan->flags |= map_regdom_flags(reg_rule->flags);
989 chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
990 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
991 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
992}
993
994static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
995 const struct ieee80211_regdomain *regd)
996{
997 unsigned int i;
998 struct ieee80211_supported_band *sband;
999
1000 BUG_ON(!wiphy->bands[band]);
1001 sband = wiphy->bands[band];
1002
1003 for (i = 0; i < sband->n_channels; i++)
1004 handle_channel_custom(wiphy, band, i, regd);
1005}
1006
1007/* Used by drivers prior to wiphy registration */
1008void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
1009 const struct ieee80211_regdomain *regd)
1010{
1011 enum ieee80211_band band;
1012 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1013 if (wiphy->bands[band])
1014 handle_band_custom(wiphy, band, regd);
1015 }
1016}
1017EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
1018
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001019static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
1020 const struct ieee80211_regdomain *src_regd)
1021{
1022 struct ieee80211_regdomain *regd;
1023 int size_of_regd = 0;
1024 unsigned int i;
1025
1026 size_of_regd = sizeof(struct ieee80211_regdomain) +
1027 ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
1028
1029 regd = kzalloc(size_of_regd, GFP_KERNEL);
1030 if (!regd)
1031 return -ENOMEM;
1032
1033 memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
1034
1035 for (i = 0; i < src_regd->n_reg_rules; i++)
1036 memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
1037 sizeof(struct ieee80211_reg_rule));
1038
1039 *dst_regd = regd;
1040 return 0;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001041}
1042
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001043/* Return value which can be used by ignore_request() to indicate
1044 * it has been determined we should intersect two regulatory domains */
1045#define REG_INTERSECT 1
1046
Johannes Berg84fa4f42008-10-24 20:32:23 +02001047/* This has the logic which determines when a new request
1048 * should be ignored. */
1049static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
1050 const char *alpha2)
1051{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001052 struct wiphy *last_wiphy = NULL;
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001053
1054 assert_cfg80211_lock();
1055
Johannes Berg84fa4f42008-10-24 20:32:23 +02001056 /* All initial requests are respected */
1057 if (!last_request)
1058 return 0;
1059
1060 switch (set_by) {
1061 case REGDOM_SET_BY_INIT:
1062 return -EINVAL;
1063 case REGDOM_SET_BY_CORE:
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001064 return -EINVAL;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001065 case REGDOM_SET_BY_COUNTRY_IE:
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001066
1067 last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1068
Johannes Berg84fa4f42008-10-24 20:32:23 +02001069 if (unlikely(!is_an_alpha2(alpha2)))
1070 return -EINVAL;
1071 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001072 if (last_wiphy != wiphy) {
Johannes Berg84fa4f42008-10-24 20:32:23 +02001073 /*
1074 * Two cards with two APs claiming different
1075 * different Country IE alpha2s. We could
1076 * intersect them, but that seems unlikely
1077 * to be correct. Reject second one for now.
1078 */
1079 if (!alpha2_equal(alpha2,
1080 cfg80211_regdomain->alpha2))
1081 return -EOPNOTSUPP;
1082 return -EALREADY;
1083 }
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001084 /* Two consecutive Country IE hints on the same wiphy.
1085 * This should be picked up early by the driver/stack */
1086 if (WARN_ON(!alpha2_equal(cfg80211_regdomain->alpha2,
1087 alpha2)))
Johannes Berg84fa4f42008-10-24 20:32:23 +02001088 return 0;
1089 return -EALREADY;
1090 }
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001091 return REG_INTERSECT;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001092 case REGDOM_SET_BY_DRIVER:
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001093 if (last_request->initiator == REGDOM_SET_BY_CORE) {
1094 if (is_old_static_regdom(cfg80211_regdomain))
1095 return 0;
1096 if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
1097 return 0;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001098 return -EALREADY;
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001099 }
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001100 return REG_INTERSECT;
Johannes Berg84fa4f42008-10-24 20:32:23 +02001101 case REGDOM_SET_BY_USER:
Johannes Berg84fa4f42008-10-24 20:32:23 +02001102 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001103 return REG_INTERSECT;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001104 /* If the user knows better the user should set the regdom
1105 * to their country before the IE is picked up */
1106 if (last_request->initiator == REGDOM_SET_BY_USER &&
1107 last_request->intersect)
1108 return -EOPNOTSUPP;
Luis R. Rodriguez5eebade2009-01-22 15:05:47 -08001109 /* Process user requests only after previous user/driver/core
1110 * requests have been processed */
1111 if (last_request->initiator == REGDOM_SET_BY_CORE ||
1112 last_request->initiator == REGDOM_SET_BY_DRIVER ||
1113 last_request->initiator == REGDOM_SET_BY_USER) {
1114 if (!alpha2_equal(last_request->alpha2,
1115 cfg80211_regdomain->alpha2))
1116 return -EAGAIN;
1117 }
1118
Luis R. Rodrigueze74b1e72009-01-22 15:05:48 -08001119 if (!is_old_static_regdom(cfg80211_regdomain) &&
1120 alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
1121 return -EALREADY;
1122
Johannes Berg84fa4f42008-10-24 20:32:23 +02001123 return 0;
1124 }
1125
1126 return -EINVAL;
1127}
1128
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001129/* Caller must hold &cfg80211_mutex */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001130int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001131 const char *alpha2,
1132 u32 country_ie_checksum,
1133 enum environment_cap env)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001134{
1135 struct regulatory_request *request;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001136 bool intersect = false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001137 int r = 0;
1138
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001139 assert_cfg80211_lock();
1140
Johannes Bergbe3d4812008-10-24 20:32:21 +02001141 r = ignore_request(wiphy, set_by, alpha2);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001142
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001143 if (r == REG_INTERSECT) {
1144 if (set_by == REGDOM_SET_BY_DRIVER) {
1145 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1146 if (r)
1147 return r;
1148 }
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001149 intersect = true;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001150 } else if (r) {
1151 /* If the regulatory domain being requested by the
1152 * driver has already been set just copy it to the
1153 * wiphy */
1154 if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) {
1155 r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
1156 if (r)
1157 return r;
1158 r = -EALREADY;
1159 goto new_request;
1160 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001161 return r;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001162 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001163
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001164new_request:
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001165 request = kzalloc(sizeof(struct regulatory_request),
1166 GFP_KERNEL);
1167 if (!request)
1168 return -ENOMEM;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001169
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001170 request->alpha2[0] = alpha2[0];
1171 request->alpha2[1] = alpha2[1];
1172 request->initiator = set_by;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001173 request->wiphy_idx = get_wiphy_idx(wiphy);
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001174 request->intersect = intersect;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001175 request->country_ie_checksum = country_ie_checksum;
1176 request->country_ie_env = env;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001177
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -08001178 kfree(last_request);
1179 last_request = request;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001180
1181 /* When r == REG_INTERSECT we do need to call CRDA */
1182 if (r < 0)
1183 return r;
1184
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001185 /*
1186 * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
1187 * AND if CRDA is NOT present nothing will happen, if someone
1188 * wants to bother with 11d with OLD_REG you can add a timer.
1189 * If after x amount of time nothing happens you can call:
1190 *
1191 * return set_regdom(country_ie_regdomain);
1192 *
1193 * to intersect with the static rd
1194 */
Luis R. Rodriguez02ba0b32008-11-12 14:22:00 -08001195 return call_crda(alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001196}
1197
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001198static int regulatory_hint_core(const char *alpha2)
1199{
1200 struct regulatory_request *request;
1201
1202 BUG_ON(last_request);
1203
1204 request = kzalloc(sizeof(struct regulatory_request),
1205 GFP_KERNEL);
1206 if (!request)
1207 return -ENOMEM;
1208
1209 request->alpha2[0] = alpha2[0];
1210 request->alpha2[1] = alpha2[1];
1211 request->initiator = REGDOM_SET_BY_CORE;
1212
1213 last_request = request;
1214
1215 return call_crda(alpha2);
1216}
1217
Johannes Bergbe3d4812008-10-24 20:32:21 +02001218void regulatory_hint(struct wiphy *wiphy, const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001219{
Luis R. Rodriguezf9763762009-01-22 15:05:52 -08001220 int r;
Johannes Bergbe3d4812008-10-24 20:32:21 +02001221 BUG_ON(!alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001222
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001223 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguezf9763762009-01-22 15:05:52 -08001224 r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER,
1225 alpha2, 0, ENVIRON_ANY);
1226 /* This is required so that the orig_* parameters are saved */
1227 if (r == -EALREADY && wiphy->strict_regulatory)
1228 wiphy_update_regulatory(wiphy, REGDOM_SET_BY_DRIVER);
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001229 mutex_unlock(&cfg80211_mutex);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001230}
1231EXPORT_SYMBOL(regulatory_hint);
1232
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001233static bool reg_same_country_ie_hint(struct wiphy *wiphy,
1234 u32 country_ie_checksum)
1235{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001236 struct wiphy *request_wiphy;
1237
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001238 assert_cfg80211_lock();
1239
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001240 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1241
1242 if (!request_wiphy)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001243 return false;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001244
1245 if (likely(request_wiphy != wiphy))
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001246 return !country_ie_integrity_changes(country_ie_checksum);
1247 /* We should not have let these through at this point, they
1248 * should have been picked up earlier by the first alpha2 check
1249 * on the device */
1250 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
1251 return true;
1252 return false;
1253}
1254
1255void regulatory_hint_11d(struct wiphy *wiphy,
1256 u8 *country_ie,
1257 u8 country_ie_len)
1258{
1259 struct ieee80211_regdomain *rd = NULL;
1260 char alpha2[2];
1261 u32 checksum = 0;
1262 enum environment_cap env = ENVIRON_ANY;
1263
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001264 mutex_lock(&cfg80211_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001265
Luis R. Rodriguezd335fe62009-02-21 00:04:27 -05001266 if (unlikely(!last_request)) {
1267 mutex_unlock(&cfg80211_mutex);
1268 return;
1269 }
1270
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001271 /* IE len must be evenly divisible by 2 */
1272 if (country_ie_len & 0x01)
1273 goto out;
1274
1275 if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1276 goto out;
1277
1278 /* Pending country IE processing, this can happen after we
1279 * call CRDA and wait for a response if a beacon was received before
1280 * we were able to process the last regulatory_hint_11d() call */
1281 if (country_ie_regdomain)
1282 goto out;
1283
1284 alpha2[0] = country_ie[0];
1285 alpha2[1] = country_ie[1];
1286
1287 if (country_ie[2] == 'I')
1288 env = ENVIRON_INDOOR;
1289 else if (country_ie[2] == 'O')
1290 env = ENVIRON_OUTDOOR;
1291
1292 /* We will run this for *every* beacon processed for the BSSID, so
1293 * we optimize an early check to exit out early if we don't have to
1294 * do anything */
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001295 if (likely(wiphy_idx_valid(last_request->wiphy_idx))) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001296 struct cfg80211_registered_device *drv_last_ie;
1297
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001298 drv_last_ie =
1299 cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001300
1301 /* Lets keep this simple -- we trust the first AP
1302 * after we intersect with CRDA */
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001303 if (likely(&drv_last_ie->wiphy == wiphy)) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001304 /* Ignore IEs coming in on this wiphy with
1305 * the same alpha2 and environment cap */
1306 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1307 alpha2) &&
1308 env == drv_last_ie->env)) {
1309 goto out;
1310 }
1311 /* the wiphy moved on to another BSSID or the AP
1312 * was reconfigured. XXX: We need to deal with the
1313 * case where the user suspends and goes to goes
1314 * to another country, and then gets IEs from an
1315 * AP with different settings */
1316 goto out;
1317 } else {
1318 /* Ignore IEs coming in on two separate wiphys with
1319 * the same alpha2 and environment cap */
1320 if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
1321 alpha2) &&
1322 env == drv_last_ie->env)) {
1323 goto out;
1324 }
1325 /* We could potentially intersect though */
1326 goto out;
1327 }
1328 }
1329
1330 rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
1331 if (!rd)
1332 goto out;
1333
Luis R. Rodriguez915278e2009-02-21 00:04:28 -05001334 /*
1335 * This will not happen right now but we leave it here for the
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001336 * the future when we want to add suspend/resume support and having
1337 * the user move to another country after doing so, or having the user
Luis R. Rodriguez915278e2009-02-21 00:04:28 -05001338 * move to another AP. Right now we just trust the first AP.
1339 *
1340 * If we hit this before we add this support we want to be informed of
1341 * it as it would indicate a mistake in the current design
1342 */
1343 if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))
Luis R. Rodriguez0441d6f2009-02-21 00:04:29 -05001344 goto free_rd_out;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001345
1346 /* We keep this around for when CRDA comes back with a response so
1347 * we can intersect with that */
1348 country_ie_regdomain = rd;
1349
1350 __regulatory_hint(wiphy, REGDOM_SET_BY_COUNTRY_IE,
1351 country_ie_regdomain->alpha2, checksum, env);
1352
Luis R. Rodriguez0441d6f2009-02-21 00:04:29 -05001353 goto out;
1354
1355free_rd_out:
1356 kfree(rd);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001357out:
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001358 mutex_unlock(&cfg80211_mutex);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001359}
1360EXPORT_SYMBOL(regulatory_hint_11d);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001361
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001362static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001363{
1364 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001365 const struct ieee80211_reg_rule *reg_rule = NULL;
1366 const struct ieee80211_freq_range *freq_range = NULL;
1367 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001368
1369 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
1370 "(max_antenna_gain, max_eirp)\n");
1371
1372 for (i = 0; i < rd->n_reg_rules; i++) {
1373 reg_rule = &rd->reg_rules[i];
1374 freq_range = &reg_rule->freq_range;
1375 power_rule = &reg_rule->power_rule;
1376
1377 /* There may not be documentation for max antenna gain
1378 * in certain regions */
1379 if (power_rule->max_antenna_gain)
1380 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1381 "(%d mBi, %d mBm)\n",
1382 freq_range->start_freq_khz,
1383 freq_range->end_freq_khz,
1384 freq_range->max_bandwidth_khz,
1385 power_rule->max_antenna_gain,
1386 power_rule->max_eirp);
1387 else
1388 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
1389 "(N/A, %d mBm)\n",
1390 freq_range->start_freq_khz,
1391 freq_range->end_freq_khz,
1392 freq_range->max_bandwidth_khz,
1393 power_rule->max_eirp);
1394 }
1395}
1396
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001397static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001398{
1399
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001400 if (is_intersected_alpha2(rd->alpha2)) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001401
1402 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001403 struct cfg80211_registered_device *drv;
1404 drv = cfg80211_drv_by_wiphy_idx(
1405 last_request->wiphy_idx);
1406 if (drv) {
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001407 printk(KERN_INFO "cfg80211: Current regulatory "
1408 "domain updated by AP to: %c%c\n",
1409 drv->country_ie_alpha2[0],
1410 drv->country_ie_alpha2[1]);
1411 } else
1412 printk(KERN_INFO "cfg80211: Current regulatory "
1413 "domain intersected: \n");
1414 } else
1415 printk(KERN_INFO "cfg80211: Current regulatory "
Luis R. Rodriguez039498c2009-01-07 17:43:35 -08001416 "domain intersected: \n");
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001417 } else if (is_world_regdom(rd->alpha2))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001418 printk(KERN_INFO "cfg80211: World regulatory "
1419 "domain updated:\n");
1420 else {
1421 if (is_unknown_alpha2(rd->alpha2))
1422 printk(KERN_INFO "cfg80211: Regulatory domain "
1423 "changed to driver built-in settings "
1424 "(unknown country)\n");
1425 else
1426 printk(KERN_INFO "cfg80211: Regulatory domain "
1427 "changed to country: %c%c\n",
1428 rd->alpha2[0], rd->alpha2[1]);
1429 }
1430 print_rd_rules(rd);
1431}
1432
Johannes Berg2df78162008-10-28 16:49:41 +01001433static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001434{
1435 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
1436 rd->alpha2[0], rd->alpha2[1]);
1437 print_rd_rules(rd);
1438}
1439
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001440#ifdef CONFIG_CFG80211_REG_DEBUG
1441static void reg_country_ie_process_debug(
1442 const struct ieee80211_regdomain *rd,
1443 const struct ieee80211_regdomain *country_ie_regdomain,
1444 const struct ieee80211_regdomain *intersected_rd)
1445{
1446 printk(KERN_DEBUG "cfg80211: Received country IE:\n");
1447 print_regdomain_info(country_ie_regdomain);
1448 printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
1449 print_regdomain_info(rd);
1450 if (intersected_rd) {
1451 printk(KERN_DEBUG "cfg80211: We intersect both of these "
1452 "and get:\n");
Luis R. Rodriguez667ecd02009-01-22 15:05:43 -08001453 print_regdomain_info(intersected_rd);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001454 return;
1455 }
1456 printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
1457}
1458#else
1459static inline void reg_country_ie_process_debug(
1460 const struct ieee80211_regdomain *rd,
1461 const struct ieee80211_regdomain *country_ie_regdomain,
1462 const struct ieee80211_regdomain *intersected_rd)
1463{
1464}
1465#endif
1466
Johannes Bergd2372b32008-10-24 20:32:20 +02001467/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001468static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001469{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001470 const struct ieee80211_regdomain *intersected_rd = NULL;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001471 struct cfg80211_registered_device *drv = NULL;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001472 struct wiphy *request_wiphy;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001473 /* Some basic sanity checks first */
1474
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001475 if (is_world_regdom(rd->alpha2)) {
Johannes Bergf6037d02008-10-21 11:01:33 +02001476 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001477 return -EINVAL;
1478 update_world_regdomain(rd);
1479 return 0;
1480 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001481
1482 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
1483 !is_unknown_alpha2(rd->alpha2))
1484 return -EINVAL;
1485
Johannes Bergf6037d02008-10-21 11:01:33 +02001486 if (!last_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001487 return -EINVAL;
1488
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001489 /* Lets only bother proceeding on the same alpha2 if the current
1490 * rd is non static (it means CRDA was present and was used last)
1491 * and the pending request came in from a country IE */
1492 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1493 /* If someone else asked us to change the rd lets only bother
1494 * checking if the alpha2 changes if CRDA was already called */
1495 if (!is_old_static_regdom(cfg80211_regdomain) &&
1496 !regdom_changed(rd->alpha2))
1497 return -EINVAL;
1498 }
1499
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001500 /* Now lets set the regulatory domain, update all driver channels
1501 * and finally inform them of what we have done, in case they want
1502 * to review or adjust their own settings based on their own
1503 * internal EEPROM data */
1504
Johannes Bergf6037d02008-10-21 11:01:33 +02001505 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001506 return -EINVAL;
1507
Luis R. Rodriguez8375af32008-11-12 14:21:57 -08001508 if (!is_valid_rd(rd)) {
1509 printk(KERN_ERR "cfg80211: Invalid "
1510 "regulatory domain detected:\n");
1511 print_regdomain_info(rd);
1512 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001513 }
1514
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001515 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1516
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001517 if (!last_request->intersect) {
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001518 int r;
1519
1520 if (last_request->initiator != REGDOM_SET_BY_DRIVER) {
1521 reset_regdomains();
1522 cfg80211_regdomain = rd;
1523 return 0;
1524 }
1525
1526 /* For a driver hint, lets copy the regulatory domain the
1527 * driver wanted to the wiphy to deal with conflicts */
1528
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001529 BUG_ON(request_wiphy->regd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001530
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001531 r = reg_copy_regd(&request_wiphy->regd, rd);
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001532 if (r)
1533 return r;
1534
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001535 reset_regdomains();
1536 cfg80211_regdomain = rd;
1537 return 0;
1538 }
1539
1540 /* Intersection requires a bit more work */
1541
1542 if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
1543
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001544 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1545 if (!intersected_rd)
1546 return -EINVAL;
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001547
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001548 /* We can trash what CRDA provided now.
1549 * However if a driver requested this specific regulatory
1550 * domain we keep it for its private use */
1551 if (last_request->initiator == REGDOM_SET_BY_DRIVER)
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001552 request_wiphy->regd = rd;
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001553 else
1554 kfree(rd);
1555
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001556 rd = NULL;
1557
1558 reset_regdomains();
1559 cfg80211_regdomain = intersected_rd;
1560
1561 return 0;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -07001562 }
1563
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001564 /*
1565 * Country IE requests are handled a bit differently, we intersect
1566 * the country IE rd with what CRDA believes that country should have
1567 */
1568
1569 BUG_ON(!country_ie_regdomain);
1570
1571 if (rd != country_ie_regdomain) {
1572 /* Intersect what CRDA returned and our what we
1573 * had built from the Country IE received */
1574
1575 intersected_rd = regdom_intersect(rd, country_ie_regdomain);
1576
1577 reg_country_ie_process_debug(rd, country_ie_regdomain,
1578 intersected_rd);
1579
1580 kfree(country_ie_regdomain);
1581 country_ie_regdomain = NULL;
1582 } else {
1583 /* This would happen when CRDA was not present and
1584 * OLD_REGULATORY was enabled. We intersect our Country
1585 * IE rd and what was set on cfg80211 originally */
1586 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
1587 }
1588
1589 if (!intersected_rd)
1590 return -EINVAL;
1591
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001592 drv = wiphy_to_dev(request_wiphy);
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001593
1594 drv->country_ie_alpha2[0] = rd->alpha2[0];
1595 drv->country_ie_alpha2[1] = rd->alpha2[1];
1596 drv->env = last_request->country_ie_env;
1597
1598 BUG_ON(intersected_rd == rd);
1599
1600 kfree(rd);
1601 rd = NULL;
1602
Luis R. Rodriguezb8295ac2008-11-12 14:21:58 -08001603 reset_regdomains();
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001604 cfg80211_regdomain = intersected_rd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001605
1606 return 0;
1607}
1608
1609
1610/* Use this call to set the current regulatory domain. Conflicts with
1611 * multiple drivers can be ironed out later. Caller must've already
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001612 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex */
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001613int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001614{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001615 int r;
1616
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001617 assert_cfg80211_lock();
1618
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001619 /* Note that this doesn't update the wiphys, this is done below */
1620 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +02001621 if (r) {
1622 kfree(rd);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001623 return r;
Johannes Bergd2372b32008-10-24 20:32:20 +02001624 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001625
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001626 /* This would make this whole thing pointless */
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08001627 if (!last_request->intersect)
1628 BUG_ON(rd != cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001629
1630 /* update all wiphys now with the new established regulatory domain */
Johannes Bergf6037d02008-10-21 11:01:33 +02001631 update_all_wiphy_regulatory(last_request->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001632
Luis R. Rodrigueza01ddaf2008-11-12 14:21:59 -08001633 print_regdomain(cfg80211_regdomain);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001634
1635 return r;
1636}
1637
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001638/* Caller must hold cfg80211_mutex */
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001639void reg_device_remove(struct wiphy *wiphy)
1640{
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001641 struct wiphy *request_wiphy;
1642
Luis R. Rodriguez761cf7e2009-02-21 00:04:25 -05001643 assert_cfg80211_lock();
1644
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001645 request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
1646
Luis R. Rodriguez3e0c3ff2009-01-07 17:43:34 -08001647 kfree(wiphy->regd);
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001648 if (!last_request || !request_wiphy)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001649 return;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001650 if (request_wiphy != wiphy)
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001651 return;
Luis R. Rodriguez806a9e32009-02-21 00:04:26 -05001652 last_request->wiphy_idx = WIPHY_IDX_STALE;
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001653 last_request->country_ie_env = ENVIRON_ANY;
1654}
1655
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001656int regulatory_init(void)
1657{
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05001658 int err = 0;
Johannes Berg734366d2008-09-15 10:56:48 +02001659
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001660 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
1661 if (IS_ERR(reg_pdev))
1662 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02001663
1664#ifdef CONFIG_WIRELESS_OLD_REGULATORY
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001665 cfg80211_regdomain = static_regdom(ieee80211_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +02001666
Johannes Berg942b25c2008-09-15 11:26:47 +02001667 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
Johannes Berg734366d2008-09-15 10:56:48 +02001668 print_regdomain_info(cfg80211_regdomain);
1669 /* The old code still requests for a new regdomain and if
1670 * you have CRDA you get it updated, otherwise you get
1671 * stuck with the static values. We ignore "EU" code as
1672 * that is not a valid ISO / IEC 3166 alpha2 */
Johannes Bergac9440a2008-10-21 11:08:27 +02001673 if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001674 err = regulatory_hint_core(ieee80211_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +02001675#else
Johannes Berga3d2eaf2008-09-15 11:10:52 +02001676 cfg80211_regdomain = cfg80211_world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +02001677
Luis R. Rodriguezba25c142009-02-21 00:04:23 -05001678 err = regulatory_hint_core("00");
Johannes Berg734366d2008-09-15 10:56:48 +02001679#endif
Luis R. Rodriguezbcf4f992009-02-21 00:04:24 -05001680 if (err) {
1681 if (err == -ENOMEM)
1682 return err;
1683 /*
1684 * N.B. kobject_uevent_env() can fail mainly for when we're out
1685 * memory which is handled and propagated appropriately above
1686 * but it can also fail during a netlink_broadcast() or during
1687 * early boot for call_usermodehelper(). For now treat these
1688 * errors as non-fatal.
1689 */
1690 printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
1691 "to call CRDA during init");
1692#ifdef CONFIG_CFG80211_REG_DEBUG
1693 /* We want to find out exactly why when debugging */
1694 WARN_ON(err);
1695#endif
1696 }
Johannes Berg734366d2008-09-15 10:56:48 +02001697
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001698 return 0;
1699}
1700
1701void regulatory_exit(void)
1702{
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001703 mutex_lock(&cfg80211_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +02001704
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001705 reset_regdomains();
Johannes Berg734366d2008-09-15 10:56:48 +02001706
Luis R. Rodriguez3f2355c2008-11-12 14:22:02 -08001707 kfree(country_ie_regdomain);
1708 country_ie_regdomain = NULL;
1709
Johannes Bergf6037d02008-10-21 11:01:33 +02001710 kfree(last_request);
1711
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07001712 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +02001713
Luis R. Rodrigueza1794392009-02-21 00:04:21 -05001714 mutex_unlock(&cfg80211_mutex);
Johannes Berg8318d782008-01-24 19:38:38 +01001715}