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Commit | Line | Data |
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8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
b2e1b302 | 5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
8318d78a JB |
6 | * |
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 | ||
b2e1b302 LR |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
14 | * |
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 | * | |
b2e1b302 LR |
20 | * 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 | * | |
8318d78a JB |
34 | */ |
35 | #include <linux/kernel.h> | |
b2e1b302 LR |
36 | #include <linux/list.h> |
37 | #include <linux/random.h> | |
38 | #include <linux/nl80211.h> | |
39 | #include <linux/platform_device.h> | |
8318d78a | 40 | #include <net/wireless.h> |
b2e1b302 | 41 | #include <net/cfg80211.h> |
8318d78a | 42 | #include "core.h" |
b2e1b302 | 43 | #include "reg.h" |
8318d78a | 44 | |
5166ccd2 | 45 | /* Receipt of information from last regulatory request */ |
f6037d09 | 46 | static struct regulatory_request *last_request; |
734366de | 47 | |
b2e1b302 LR |
48 | /* To trigger userspace events */ |
49 | static struct platform_device *reg_pdev; | |
8318d78a | 50 | |
b2e1b302 LR |
51 | /* Keep the ordering from large to small */ |
52 | static u32 supported_bandwidths[] = { | |
53 | MHZ_TO_KHZ(40), | |
54 | MHZ_TO_KHZ(20), | |
8318d78a JB |
55 | }; |
56 | ||
fb1fc7ad LR |
57 | /* |
58 | * Central wireless core regulatory domains, we only need two, | |
734366de | 59 | * the current one and a world regulatory domain in case we have no |
fb1fc7ad LR |
60 | * information to give us an alpha2 |
61 | */ | |
f130347c | 62 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 63 | |
fb1fc7ad LR |
64 | /* |
65 | * We use this as a place for the rd structure built from the | |
3f2355cb | 66 | * last parsed country IE to rest until CRDA gets back to us with |
fb1fc7ad LR |
67 | * what it thinks should apply for the same country |
68 | */ | |
3f2355cb LR |
69 | static const struct ieee80211_regdomain *country_ie_regdomain; |
70 | ||
fe33eb39 LR |
71 | static LIST_HEAD(reg_requests_list); |
72 | static spinlock_t reg_requests_lock; | |
73 | ||
734366de JB |
74 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
75 | static const struct ieee80211_regdomain world_regdom = { | |
76 | .n_reg_rules = 1, | |
77 | .alpha2 = "00", | |
78 | .reg_rules = { | |
79 | REG_RULE(2412-10, 2462+10, 40, 6, 20, | |
80 | NL80211_RRF_PASSIVE_SCAN | | |
81 | NL80211_RRF_NO_IBSS), | |
82 | } | |
83 | }; | |
84 | ||
a3d2eaf0 JB |
85 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
86 | &world_regdom; | |
734366de JB |
87 | |
88 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
89 | static char *ieee80211_regdom = "US"; | |
90 | module_param(ieee80211_regdom, charp, 0444); | |
91 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
92 | ||
fb1fc7ad LR |
93 | /* |
94 | * We assume 40 MHz bandwidth for the old regulatory work. | |
734366de | 95 | * We make emphasis we are using the exact same frequencies |
fb1fc7ad LR |
96 | * as before |
97 | */ | |
734366de JB |
98 | |
99 | static const struct ieee80211_regdomain us_regdom = { | |
100 | .n_reg_rules = 6, | |
101 | .alpha2 = "US", | |
102 | .reg_rules = { | |
103 | /* IEEE 802.11b/g, channels 1..11 */ | |
104 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
105 | /* IEEE 802.11a, channel 36 */ | |
106 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
107 | /* IEEE 802.11a, channel 40 */ | |
108 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
109 | /* IEEE 802.11a, channel 44 */ | |
110 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
111 | /* IEEE 802.11a, channels 48..64 */ | |
112 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
113 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
114 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
115 | } | |
116 | }; | |
117 | ||
118 | static const struct ieee80211_regdomain jp_regdom = { | |
119 | .n_reg_rules = 3, | |
120 | .alpha2 = "JP", | |
121 | .reg_rules = { | |
122 | /* IEEE 802.11b/g, channels 1..14 */ | |
123 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
124 | /* IEEE 802.11a, channels 34..48 */ | |
125 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
126 | NL80211_RRF_PASSIVE_SCAN), | |
127 | /* IEEE 802.11a, channels 52..64 */ | |
128 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
129 | NL80211_RRF_NO_IBSS | | |
130 | NL80211_RRF_DFS), | |
131 | } | |
132 | }; | |
133 | ||
134 | static const struct ieee80211_regdomain eu_regdom = { | |
135 | .n_reg_rules = 6, | |
fb1fc7ad LR |
136 | /* |
137 | * This alpha2 is bogus, we leave it here just for stupid | |
138 | * backward compatibility | |
139 | */ | |
734366de JB |
140 | .alpha2 = "EU", |
141 | .reg_rules = { | |
142 | /* IEEE 802.11b/g, channels 1..13 */ | |
143 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
144 | /* IEEE 802.11a, channel 36 */ | |
145 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
146 | NL80211_RRF_PASSIVE_SCAN), | |
147 | /* IEEE 802.11a, channel 40 */ | |
148 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
149 | NL80211_RRF_PASSIVE_SCAN), | |
150 | /* IEEE 802.11a, channel 44 */ | |
151 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
152 | NL80211_RRF_PASSIVE_SCAN), | |
153 | /* IEEE 802.11a, channels 48..64 */ | |
154 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
155 | NL80211_RRF_NO_IBSS | | |
156 | NL80211_RRF_DFS), | |
157 | /* IEEE 802.11a, channels 100..140 */ | |
158 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
159 | NL80211_RRF_NO_IBSS | | |
160 | NL80211_RRF_DFS), | |
161 | } | |
162 | }; | |
163 | ||
164 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
165 | { | |
166 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
167 | return &us_regdom; | |
168 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
169 | return &jp_regdom; | |
170 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
171 | return &eu_regdom; | |
172 | /* Default, as per the old rules */ | |
173 | return &us_regdom; | |
174 | } | |
175 | ||
a3d2eaf0 | 176 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
177 | { |
178 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
179 | return true; | |
180 | return false; | |
181 | } | |
942b25cf JB |
182 | #else |
183 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 184 | { |
942b25cf | 185 | return false; |
734366de | 186 | } |
942b25cf JB |
187 | #endif |
188 | ||
734366de JB |
189 | static void reset_regdomains(void) |
190 | { | |
942b25cf JB |
191 | /* avoid freeing static information or freeing something twice */ |
192 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
193 | cfg80211_regdomain = NULL; | |
194 | if (cfg80211_world_regdom == &world_regdom) | |
195 | cfg80211_world_regdom = NULL; | |
196 | if (cfg80211_regdomain == &world_regdom) | |
197 | cfg80211_regdomain = NULL; | |
198 | if (is_old_static_regdom(cfg80211_regdomain)) | |
199 | cfg80211_regdomain = NULL; | |
200 | ||
201 | kfree(cfg80211_regdomain); | |
202 | kfree(cfg80211_world_regdom); | |
734366de | 203 | |
a3d2eaf0 | 204 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
205 | cfg80211_regdomain = NULL; |
206 | } | |
207 | ||
fb1fc7ad LR |
208 | /* |
209 | * Dynamic world regulatory domain requested by the wireless | |
210 | * core upon initialization | |
211 | */ | |
a3d2eaf0 | 212 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 213 | { |
f6037d09 | 214 | BUG_ON(!last_request); |
734366de JB |
215 | |
216 | reset_regdomains(); | |
217 | ||
218 | cfg80211_world_regdom = rd; | |
219 | cfg80211_regdomain = rd; | |
220 | } | |
734366de | 221 | |
a3d2eaf0 | 222 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
223 | { |
224 | if (!alpha2) | |
225 | return false; | |
226 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
227 | return true; | |
228 | return false; | |
229 | } | |
8318d78a | 230 | |
a3d2eaf0 | 231 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
232 | { |
233 | if (!alpha2) | |
234 | return false; | |
235 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
236 | return true; | |
237 | return false; | |
238 | } | |
8318d78a | 239 | |
b2e1b302 LR |
240 | static bool is_alpha_upper(char letter) |
241 | { | |
242 | /* ASCII A - Z */ | |
243 | if (letter >= 65 && letter <= 90) | |
244 | return true; | |
245 | return false; | |
246 | } | |
8318d78a | 247 | |
a3d2eaf0 | 248 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
249 | { |
250 | if (!alpha2) | |
251 | return false; | |
fb1fc7ad LR |
252 | /* |
253 | * Special case where regulatory domain was built by driver | |
254 | * but a specific alpha2 cannot be determined | |
255 | */ | |
b2e1b302 LR |
256 | if (alpha2[0] == '9' && alpha2[1] == '9') |
257 | return true; | |
258 | return false; | |
259 | } | |
8318d78a | 260 | |
3f2355cb LR |
261 | static bool is_intersected_alpha2(const char *alpha2) |
262 | { | |
263 | if (!alpha2) | |
264 | return false; | |
fb1fc7ad LR |
265 | /* |
266 | * Special case where regulatory domain is the | |
3f2355cb | 267 | * result of an intersection between two regulatory domain |
fb1fc7ad LR |
268 | * structures |
269 | */ | |
3f2355cb LR |
270 | if (alpha2[0] == '9' && alpha2[1] == '8') |
271 | return true; | |
272 | return false; | |
273 | } | |
274 | ||
a3d2eaf0 | 275 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
276 | { |
277 | if (!alpha2) | |
278 | return false; | |
279 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
280 | return true; | |
281 | return false; | |
282 | } | |
8318d78a | 283 | |
a3d2eaf0 | 284 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
285 | { |
286 | if (!alpha2_x || !alpha2_y) | |
287 | return false; | |
288 | if (alpha2_x[0] == alpha2_y[0] && | |
289 | alpha2_x[1] == alpha2_y[1]) | |
290 | return true; | |
291 | return false; | |
292 | } | |
293 | ||
69b1572b | 294 | static bool regdom_changes(const char *alpha2) |
b2e1b302 | 295 | { |
761cf7ec LR |
296 | assert_cfg80211_lock(); |
297 | ||
b2e1b302 LR |
298 | if (!cfg80211_regdomain) |
299 | return true; | |
300 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
301 | return false; | |
302 | return true; | |
303 | } | |
304 | ||
3f2355cb LR |
305 | /** |
306 | * country_ie_integrity_changes - tells us if the country IE has changed | |
307 | * @checksum: checksum of country IE of fields we are interested in | |
308 | * | |
309 | * If the country IE has not changed you can ignore it safely. This is | |
310 | * useful to determine if two devices are seeing two different country IEs | |
311 | * even on the same alpha2. Note that this will return false if no IE has | |
312 | * been set on the wireless core yet. | |
313 | */ | |
314 | static bool country_ie_integrity_changes(u32 checksum) | |
315 | { | |
316 | /* If no IE has been set then the checksum doesn't change */ | |
317 | if (unlikely(!last_request->country_ie_checksum)) | |
318 | return false; | |
319 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
320 | return true; | |
321 | return false; | |
322 | } | |
323 | ||
fb1fc7ad LR |
324 | /* |
325 | * This lets us keep regulatory code which is updated on a regulatory | |
326 | * basis in userspace. | |
327 | */ | |
b2e1b302 LR |
328 | static int call_crda(const char *alpha2) |
329 | { | |
330 | char country_env[9 + 2] = "COUNTRY="; | |
331 | char *envp[] = { | |
332 | country_env, | |
333 | NULL | |
334 | }; | |
335 | ||
336 | if (!is_world_regdom((char *) alpha2)) | |
337 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
338 | alpha2[0], alpha2[1]); | |
339 | else | |
b2e1b302 LR |
340 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
341 | "regulatory domain\n"); | |
b2e1b302 LR |
342 | |
343 | country_env[8] = alpha2[0]; | |
344 | country_env[9] = alpha2[1]; | |
345 | ||
346 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
347 | } | |
348 | ||
b2e1b302 | 349 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 350 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 351 | { |
f6037d09 JB |
352 | if (!last_request) |
353 | return false; | |
354 | ||
355 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 356 | } |
8318d78a | 357 | |
b2e1b302 | 358 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 359 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 360 | { |
a3d2eaf0 | 361 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
362 | u32 freq_diff; |
363 | ||
91e99004 | 364 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
365 | return false; |
366 | ||
367 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
368 | return false; | |
369 | ||
370 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
371 | ||
d71aaf60 | 372 | if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff) |
b2e1b302 LR |
373 | return false; |
374 | ||
375 | return true; | |
376 | } | |
377 | ||
a3d2eaf0 | 378 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 379 | { |
a3d2eaf0 | 380 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 381 | unsigned int i; |
8318d78a | 382 | |
b2e1b302 LR |
383 | if (!rd->n_reg_rules) |
384 | return false; | |
8318d78a | 385 | |
88dc1c3f LR |
386 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
387 | return false; | |
388 | ||
b2e1b302 LR |
389 | for (i = 0; i < rd->n_reg_rules; i++) { |
390 | reg_rule = &rd->reg_rules[i]; | |
391 | if (!is_valid_reg_rule(reg_rule)) | |
392 | return false; | |
393 | } | |
394 | ||
395 | return true; | |
8318d78a JB |
396 | } |
397 | ||
b2e1b302 LR |
398 | /* Returns value in KHz */ |
399 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
400 | u32 freq) | |
401 | { | |
402 | unsigned int i; | |
403 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
404 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
405 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
406 | if (start_freq_khz >= freq_range->start_freq_khz && | |
407 | end_freq_khz <= freq_range->end_freq_khz) | |
408 | return supported_bandwidths[i]; | |
409 | } | |
410 | return 0; | |
411 | } | |
8318d78a | 412 | |
0c7dc45d LR |
413 | /** |
414 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
415 | * @freq_range: frequency rule we want to query | |
416 | * @freq_khz: frequency we are inquiring about | |
417 | * | |
418 | * This lets us know if a specific frequency rule is or is not relevant to | |
419 | * a specific frequency's band. Bands are device specific and artificial | |
420 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
421 | * safe for now to assume that a frequency rule should not be part of a | |
422 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
423 | * This resolution can be lowered and should be considered as we add | |
424 | * regulatory rule support for other "bands". | |
425 | **/ | |
426 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
427 | u32 freq_khz) | |
428 | { | |
429 | #define ONE_GHZ_IN_KHZ 1000000 | |
430 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
431 | return true; | |
432 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
433 | return true; | |
434 | return false; | |
435 | #undef ONE_GHZ_IN_KHZ | |
436 | } | |
437 | ||
fb1fc7ad LR |
438 | /* |
439 | * Converts a country IE to a regulatory domain. A regulatory domain | |
3f2355cb LR |
440 | * structure has a lot of information which the IE doesn't yet have, |
441 | * so for the other values we use upper max values as we will intersect | |
fb1fc7ad LR |
442 | * with our userspace regulatory agent to get lower bounds. |
443 | */ | |
3f2355cb LR |
444 | static struct ieee80211_regdomain *country_ie_2_rd( |
445 | u8 *country_ie, | |
446 | u8 country_ie_len, | |
447 | u32 *checksum) | |
448 | { | |
449 | struct ieee80211_regdomain *rd = NULL; | |
450 | unsigned int i = 0; | |
451 | char alpha2[2]; | |
452 | u32 flags = 0; | |
453 | u32 num_rules = 0, size_of_regd = 0; | |
454 | u8 *triplets_start = NULL; | |
455 | u8 len_at_triplet = 0; | |
456 | /* the last channel we have registered in a subband (triplet) */ | |
457 | int last_sub_max_channel = 0; | |
458 | ||
459 | *checksum = 0xDEADBEEF; | |
460 | ||
461 | /* Country IE requirements */ | |
462 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
463 | country_ie_len & 0x01); | |
464 | ||
465 | alpha2[0] = country_ie[0]; | |
466 | alpha2[1] = country_ie[1]; | |
467 | ||
468 | /* | |
469 | * Third octet can be: | |
470 | * 'I' - Indoor | |
471 | * 'O' - Outdoor | |
472 | * | |
473 | * anything else we assume is no restrictions | |
474 | */ | |
475 | if (country_ie[2] == 'I') | |
476 | flags = NL80211_RRF_NO_OUTDOOR; | |
477 | else if (country_ie[2] == 'O') | |
478 | flags = NL80211_RRF_NO_INDOOR; | |
479 | ||
480 | country_ie += 3; | |
481 | country_ie_len -= 3; | |
482 | ||
483 | triplets_start = country_ie; | |
484 | len_at_triplet = country_ie_len; | |
485 | ||
486 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
487 | ||
fb1fc7ad LR |
488 | /* |
489 | * We need to build a reg rule for each triplet, but first we must | |
3f2355cb | 490 | * calculate the number of reg rules we will need. We will need one |
fb1fc7ad LR |
491 | * for each channel subband |
492 | */ | |
3f2355cb | 493 | while (country_ie_len >= 3) { |
615aab4b | 494 | int end_channel = 0; |
3f2355cb LR |
495 | struct ieee80211_country_ie_triplet *triplet = |
496 | (struct ieee80211_country_ie_triplet *) country_ie; | |
497 | int cur_sub_max_channel = 0, cur_channel = 0; | |
498 | ||
499 | if (triplet->ext.reg_extension_id >= | |
500 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
501 | country_ie += 3; | |
502 | country_ie_len -= 3; | |
503 | continue; | |
504 | } | |
505 | ||
615aab4b LR |
506 | /* 2 GHz */ |
507 | if (triplet->chans.first_channel <= 14) | |
508 | end_channel = triplet->chans.first_channel + | |
509 | triplet->chans.num_channels; | |
510 | else | |
511 | /* | |
512 | * 5 GHz -- For example in country IEs if the first | |
513 | * channel given is 36 and the number of channels is 4 | |
514 | * then the individual channel numbers defined for the | |
515 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
516 | * and not 36, 37, 38, 39. | |
517 | * | |
518 | * See: http://tinyurl.com/11d-clarification | |
519 | */ | |
520 | end_channel = triplet->chans.first_channel + | |
521 | (4 * (triplet->chans.num_channels - 1)); | |
522 | ||
3f2355cb | 523 | cur_channel = triplet->chans.first_channel; |
615aab4b | 524 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
525 | |
526 | /* Basic sanity check */ | |
527 | if (cur_sub_max_channel < cur_channel) | |
528 | return NULL; | |
529 | ||
fb1fc7ad LR |
530 | /* |
531 | * Do not allow overlapping channels. Also channels | |
3f2355cb | 532 | * passed in each subband must be monotonically |
fb1fc7ad LR |
533 | * increasing |
534 | */ | |
3f2355cb LR |
535 | if (last_sub_max_channel) { |
536 | if (cur_channel <= last_sub_max_channel) | |
537 | return NULL; | |
538 | if (cur_sub_max_channel <= last_sub_max_channel) | |
539 | return NULL; | |
540 | } | |
541 | ||
fb1fc7ad LR |
542 | /* |
543 | * When dot11RegulatoryClassesRequired is supported | |
3f2355cb LR |
544 | * we can throw ext triplets as part of this soup, |
545 | * for now we don't care when those change as we | |
fb1fc7ad LR |
546 | * don't support them |
547 | */ | |
3f2355cb LR |
548 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | |
549 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
550 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
551 | ||
552 | last_sub_max_channel = cur_sub_max_channel; | |
553 | ||
554 | country_ie += 3; | |
555 | country_ie_len -= 3; | |
556 | num_rules++; | |
557 | ||
fb1fc7ad LR |
558 | /* |
559 | * Note: this is not a IEEE requirement but | |
560 | * simply a memory requirement | |
561 | */ | |
3f2355cb LR |
562 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) |
563 | return NULL; | |
564 | } | |
565 | ||
566 | country_ie = triplets_start; | |
567 | country_ie_len = len_at_triplet; | |
568 | ||
569 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
570 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
571 | ||
572 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
573 | if (!rd) | |
574 | return NULL; | |
575 | ||
576 | rd->n_reg_rules = num_rules; | |
577 | rd->alpha2[0] = alpha2[0]; | |
578 | rd->alpha2[1] = alpha2[1]; | |
579 | ||
580 | /* This time around we fill in the rd */ | |
581 | while (country_ie_len >= 3) { | |
02e68a3d | 582 | int end_channel = 0; |
3f2355cb LR |
583 | struct ieee80211_country_ie_triplet *triplet = |
584 | (struct ieee80211_country_ie_triplet *) country_ie; | |
585 | struct ieee80211_reg_rule *reg_rule = NULL; | |
586 | struct ieee80211_freq_range *freq_range = NULL; | |
587 | struct ieee80211_power_rule *power_rule = NULL; | |
588 | ||
fb1fc7ad LR |
589 | /* |
590 | * Must parse if dot11RegulatoryClassesRequired is true, | |
591 | * we don't support this yet | |
592 | */ | |
3f2355cb LR |
593 | if (triplet->ext.reg_extension_id >= |
594 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
595 | country_ie += 3; | |
596 | country_ie_len -= 3; | |
597 | continue; | |
598 | } | |
599 | ||
600 | reg_rule = &rd->reg_rules[i]; | |
601 | freq_range = ®_rule->freq_range; | |
602 | power_rule = ®_rule->power_rule; | |
603 | ||
604 | reg_rule->flags = flags; | |
605 | ||
02e68a3d LR |
606 | /* 2 GHz */ |
607 | if (triplet->chans.first_channel <= 14) | |
608 | end_channel = triplet->chans.first_channel + | |
609 | triplet->chans.num_channels; | |
610 | else | |
02e68a3d LR |
611 | end_channel = triplet->chans.first_channel + |
612 | (4 * (triplet->chans.num_channels - 1)); | |
613 | ||
fb1fc7ad LR |
614 | /* |
615 | * The +10 is since the regulatory domain expects | |
3f2355cb LR |
616 | * the actual band edge, not the center of freq for |
617 | * its start and end freqs, assuming 20 MHz bandwidth on | |
fb1fc7ad LR |
618 | * the channels passed |
619 | */ | |
3f2355cb LR |
620 | freq_range->start_freq_khz = |
621 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
622 | triplet->chans.first_channel) - 10); | |
623 | freq_range->end_freq_khz = | |
624 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 625 | end_channel) + 10); |
3f2355cb | 626 | |
fb1fc7ad LR |
627 | /* |
628 | * These are large arbitrary values we use to intersect later. | |
629 | * Increment this if we ever support >= 40 MHz channels | |
630 | * in IEEE 802.11 | |
631 | */ | |
3f2355cb LR |
632 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); |
633 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
634 | power_rule->max_eirp = DBM_TO_MBM(100); | |
635 | ||
636 | country_ie += 3; | |
637 | country_ie_len -= 3; | |
638 | i++; | |
639 | ||
640 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
641 | } | |
642 | ||
643 | return rd; | |
644 | } | |
645 | ||
646 | ||
fb1fc7ad LR |
647 | /* |
648 | * Helper for regdom_intersect(), this does the real | |
649 | * mathematical intersection fun | |
650 | */ | |
9c96477d LR |
651 | static int reg_rules_intersect( |
652 | const struct ieee80211_reg_rule *rule1, | |
653 | const struct ieee80211_reg_rule *rule2, | |
654 | struct ieee80211_reg_rule *intersected_rule) | |
655 | { | |
656 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
657 | struct ieee80211_freq_range *freq_range; | |
658 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
659 | struct ieee80211_power_rule *power_rule; | |
660 | u32 freq_diff; | |
661 | ||
662 | freq_range1 = &rule1->freq_range; | |
663 | freq_range2 = &rule2->freq_range; | |
664 | freq_range = &intersected_rule->freq_range; | |
665 | ||
666 | power_rule1 = &rule1->power_rule; | |
667 | power_rule2 = &rule2->power_rule; | |
668 | power_rule = &intersected_rule->power_rule; | |
669 | ||
670 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
671 | freq_range2->start_freq_khz); | |
672 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
673 | freq_range2->end_freq_khz); | |
674 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
675 | freq_range2->max_bandwidth_khz); | |
676 | ||
677 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
678 | if (freq_range->max_bandwidth_khz > freq_diff) | |
679 | freq_range->max_bandwidth_khz = freq_diff; | |
680 | ||
681 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
682 | power_rule2->max_eirp); | |
683 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
684 | power_rule2->max_antenna_gain); | |
685 | ||
686 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
687 | ||
688 | if (!is_valid_reg_rule(intersected_rule)) | |
689 | return -EINVAL; | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | /** | |
695 | * regdom_intersect - do the intersection between two regulatory domains | |
696 | * @rd1: first regulatory domain | |
697 | * @rd2: second regulatory domain | |
698 | * | |
699 | * Use this function to get the intersection between two regulatory domains. | |
700 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
701 | * as no one single alpha2 can represent this regulatory domain. | |
702 | * | |
703 | * Returns a pointer to the regulatory domain structure which will hold the | |
704 | * resulting intersection of rules between rd1 and rd2. We will | |
705 | * kzalloc() this structure for you. | |
706 | */ | |
707 | static struct ieee80211_regdomain *regdom_intersect( | |
708 | const struct ieee80211_regdomain *rd1, | |
709 | const struct ieee80211_regdomain *rd2) | |
710 | { | |
711 | int r, size_of_regd; | |
712 | unsigned int x, y; | |
713 | unsigned int num_rules = 0, rule_idx = 0; | |
714 | const struct ieee80211_reg_rule *rule1, *rule2; | |
715 | struct ieee80211_reg_rule *intersected_rule; | |
716 | struct ieee80211_regdomain *rd; | |
717 | /* This is just a dummy holder to help us count */ | |
718 | struct ieee80211_reg_rule irule; | |
719 | ||
720 | /* Uses the stack temporarily for counter arithmetic */ | |
721 | intersected_rule = &irule; | |
722 | ||
723 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
724 | ||
725 | if (!rd1 || !rd2) | |
726 | return NULL; | |
727 | ||
fb1fc7ad LR |
728 | /* |
729 | * First we get a count of the rules we'll need, then we actually | |
9c96477d LR |
730 | * build them. This is to so we can malloc() and free() a |
731 | * regdomain once. The reason we use reg_rules_intersect() here | |
732 | * is it will return -EINVAL if the rule computed makes no sense. | |
fb1fc7ad LR |
733 | * All rules that do check out OK are valid. |
734 | */ | |
9c96477d LR |
735 | |
736 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
737 | rule1 = &rd1->reg_rules[x]; | |
738 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
739 | rule2 = &rd2->reg_rules[y]; | |
740 | if (!reg_rules_intersect(rule1, rule2, | |
741 | intersected_rule)) | |
742 | num_rules++; | |
743 | memset(intersected_rule, 0, | |
744 | sizeof(struct ieee80211_reg_rule)); | |
745 | } | |
746 | } | |
747 | ||
748 | if (!num_rules) | |
749 | return NULL; | |
750 | ||
751 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
752 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
753 | ||
754 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
755 | if (!rd) | |
756 | return NULL; | |
757 | ||
758 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
759 | rule1 = &rd1->reg_rules[x]; | |
760 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
761 | rule2 = &rd2->reg_rules[y]; | |
fb1fc7ad LR |
762 | /* |
763 | * This time around instead of using the stack lets | |
9c96477d | 764 | * write to the target rule directly saving ourselves |
fb1fc7ad LR |
765 | * a memcpy() |
766 | */ | |
9c96477d LR |
767 | intersected_rule = &rd->reg_rules[rule_idx]; |
768 | r = reg_rules_intersect(rule1, rule2, | |
769 | intersected_rule); | |
fb1fc7ad LR |
770 | /* |
771 | * No need to memset here the intersected rule here as | |
772 | * we're not using the stack anymore | |
773 | */ | |
9c96477d LR |
774 | if (r) |
775 | continue; | |
776 | rule_idx++; | |
777 | } | |
778 | } | |
779 | ||
780 | if (rule_idx != num_rules) { | |
781 | kfree(rd); | |
782 | return NULL; | |
783 | } | |
784 | ||
785 | rd->n_reg_rules = num_rules; | |
786 | rd->alpha2[0] = '9'; | |
787 | rd->alpha2[1] = '8'; | |
788 | ||
789 | return rd; | |
790 | } | |
791 | ||
fb1fc7ad LR |
792 | /* |
793 | * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
794 | * want to just have the channel structure use these | |
795 | */ | |
b2e1b302 LR |
796 | static u32 map_regdom_flags(u32 rd_flags) |
797 | { | |
798 | u32 channel_flags = 0; | |
799 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
800 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
801 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
802 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
803 | if (rd_flags & NL80211_RRF_DFS) | |
804 | channel_flags |= IEEE80211_CHAN_RADAR; | |
805 | return channel_flags; | |
806 | } | |
807 | ||
1fa25e41 LR |
808 | static int freq_reg_info_regd(struct wiphy *wiphy, |
809 | u32 center_freq, | |
810 | u32 *bandwidth, | |
811 | const struct ieee80211_reg_rule **reg_rule, | |
812 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
813 | { |
814 | int i; | |
0c7dc45d | 815 | bool band_rule_found = false; |
3e0c3ff3 | 816 | const struct ieee80211_regdomain *regd; |
b2e1b302 | 817 | u32 max_bandwidth = 0; |
8318d78a | 818 | |
1fa25e41 | 819 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 | 820 | |
fb1fc7ad LR |
821 | /* |
822 | * Follow the driver's regulatory domain, if present, unless a country | |
823 | * IE has been processed or a user wants to help complaince further | |
824 | */ | |
3e0c3ff3 | 825 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE && |
24ed1da1 | 826 | last_request->initiator != REGDOM_SET_BY_USER && |
3e0c3ff3 LR |
827 | wiphy->regd) |
828 | regd = wiphy->regd; | |
829 | ||
830 | if (!regd) | |
b2e1b302 LR |
831 | return -EINVAL; |
832 | ||
3e0c3ff3 | 833 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
834 | const struct ieee80211_reg_rule *rr; |
835 | const struct ieee80211_freq_range *fr = NULL; | |
836 | const struct ieee80211_power_rule *pr = NULL; | |
837 | ||
3e0c3ff3 | 838 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
839 | fr = &rr->freq_range; |
840 | pr = &rr->power_rule; | |
0c7dc45d | 841 | |
fb1fc7ad LR |
842 | /* |
843 | * We only need to know if one frequency rule was | |
0c7dc45d | 844 | * was in center_freq's band, that's enough, so lets |
fb1fc7ad LR |
845 | * not overwrite it once found |
846 | */ | |
0c7dc45d LR |
847 | if (!band_rule_found) |
848 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
849 | ||
b2e1b302 | 850 | max_bandwidth = freq_max_bandwidth(fr, center_freq); |
0c7dc45d | 851 | |
b2e1b302 LR |
852 | if (max_bandwidth && *bandwidth <= max_bandwidth) { |
853 | *reg_rule = rr; | |
854 | *bandwidth = max_bandwidth; | |
8318d78a JB |
855 | break; |
856 | } | |
857 | } | |
858 | ||
0c7dc45d LR |
859 | if (!band_rule_found) |
860 | return -ERANGE; | |
861 | ||
b2e1b302 LR |
862 | return !max_bandwidth; |
863 | } | |
34f57347 | 864 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 865 | |
34f57347 | 866 | int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth, |
1fa25e41 LR |
867 | const struct ieee80211_reg_rule **reg_rule) |
868 | { | |
869 | return freq_reg_info_regd(wiphy, center_freq, | |
870 | bandwidth, reg_rule, NULL); | |
871 | } | |
b2e1b302 | 872 | |
a92a3ce7 LR |
873 | static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, |
874 | unsigned int chan_idx) | |
b2e1b302 LR |
875 | { |
876 | int r; | |
a92a3ce7 | 877 | u32 flags; |
b2e1b302 LR |
878 | u32 max_bandwidth = 0; |
879 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
880 | const struct ieee80211_power_rule *power_rule = NULL; | |
a92a3ce7 LR |
881 | struct ieee80211_supported_band *sband; |
882 | struct ieee80211_channel *chan; | |
fe33eb39 | 883 | struct wiphy *request_wiphy = NULL; |
a92a3ce7 | 884 | |
761cf7ec LR |
885 | assert_cfg80211_lock(); |
886 | ||
806a9e39 LR |
887 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
888 | ||
a92a3ce7 LR |
889 | sband = wiphy->bands[band]; |
890 | BUG_ON(chan_idx >= sband->n_channels); | |
891 | chan = &sband->channels[chan_idx]; | |
892 | ||
893 | flags = chan->orig_flags; | |
b2e1b302 | 894 | |
3e0c3ff3 | 895 | r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq), |
b2e1b302 LR |
896 | &max_bandwidth, ®_rule); |
897 | ||
898 | if (r) { | |
fb1fc7ad LR |
899 | /* |
900 | * This means no regulatory rule was found in the country IE | |
0c7dc45d LR |
901 | * with a frequency range on the center_freq's band, since |
902 | * IEEE-802.11 allows for a country IE to have a subset of the | |
903 | * regulatory information provided in a country we ignore | |
904 | * disabling the channel unless at least one reg rule was | |
905 | * found on the center_freq's band. For details see this | |
906 | * clarification: | |
907 | * | |
908 | * http://tinyurl.com/11d-clarification | |
909 | */ | |
910 | if (r == -ERANGE && | |
911 | last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
912 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
913 | printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " | |
914 | "intact on %s - no rule found in band on " | |
915 | "Country IE\n", | |
916 | chan->center_freq, wiphy_name(wiphy)); | |
917 | #endif | |
918 | } else { | |
fb1fc7ad LR |
919 | /* |
920 | * In this case we know the country IE has at least one reg rule | |
921 | * for the band so we respect its band definitions | |
922 | */ | |
0c7dc45d LR |
923 | #ifdef CONFIG_CFG80211_REG_DEBUG |
924 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
925 | printk(KERN_DEBUG "cfg80211: Disabling " | |
926 | "channel %d MHz on %s due to " | |
927 | "Country IE\n", | |
928 | chan->center_freq, wiphy_name(wiphy)); | |
929 | #endif | |
930 | flags |= IEEE80211_CHAN_DISABLED; | |
931 | chan->flags = flags; | |
932 | } | |
8318d78a JB |
933 | return; |
934 | } | |
935 | ||
b2e1b302 LR |
936 | power_rule = ®_rule->power_rule; |
937 | ||
f976376d | 938 | if (last_request->initiator == REGDOM_SET_BY_DRIVER && |
806a9e39 LR |
939 | request_wiphy && request_wiphy == wiphy && |
940 | request_wiphy->strict_regulatory) { | |
fb1fc7ad LR |
941 | /* |
942 | * This gaurantees the driver's requested regulatory domain | |
f976376d | 943 | * will always be used as a base for further regulatory |
fb1fc7ad LR |
944 | * settings |
945 | */ | |
f976376d LR |
946 | chan->flags = chan->orig_flags = |
947 | map_regdom_flags(reg_rule->flags); | |
948 | chan->max_antenna_gain = chan->orig_mag = | |
949 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
950 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
951 | chan->max_power = chan->orig_mpwr = | |
952 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
953 | return; | |
954 | } | |
955 | ||
b2e1b302 | 956 | chan->flags = flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 957 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
958 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
959 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 960 | if (chan->orig_mpwr) |
b2e1b302 LR |
961 | chan->max_power = min(chan->orig_mpwr, |
962 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 963 | else |
b2e1b302 | 964 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
965 | } |
966 | ||
a92a3ce7 | 967 | static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) |
8318d78a | 968 | { |
a92a3ce7 LR |
969 | unsigned int i; |
970 | struct ieee80211_supported_band *sband; | |
971 | ||
972 | BUG_ON(!wiphy->bands[band]); | |
973 | sband = wiphy->bands[band]; | |
8318d78a JB |
974 | |
975 | for (i = 0; i < sband->n_channels; i++) | |
a92a3ce7 | 976 | handle_channel(wiphy, band, i); |
8318d78a JB |
977 | } |
978 | ||
14b9815a LR |
979 | static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby) |
980 | { | |
981 | if (!last_request) | |
982 | return true; | |
983 | if (setby == REGDOM_SET_BY_CORE && | |
2a44f911 | 984 | wiphy->custom_regulatory) |
14b9815a | 985 | return true; |
fb1fc7ad LR |
986 | /* |
987 | * wiphy->regd will be set once the device has its own | |
988 | * desired regulatory domain set | |
989 | */ | |
f976376d LR |
990 | if (wiphy->strict_regulatory && !wiphy->regd && |
991 | !is_world_regdom(last_request->alpha2)) | |
14b9815a LR |
992 | return true; |
993 | return false; | |
994 | } | |
995 | ||
b2e1b302 | 996 | static void update_all_wiphy_regulatory(enum reg_set_by setby) |
8318d78a | 997 | { |
b2e1b302 | 998 | struct cfg80211_registered_device *drv; |
8318d78a | 999 | |
b2e1b302 | 1000 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
d46e5b1d | 1001 | wiphy_update_regulatory(&drv->wiphy, setby); |
b2e1b302 LR |
1002 | } |
1003 | ||
1004 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
1005 | { | |
1006 | enum ieee80211_band band; | |
d46e5b1d LR |
1007 | |
1008 | if (ignore_reg_update(wiphy, setby)) | |
1009 | return; | |
b2e1b302 | 1010 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 1011 | if (wiphy->bands[band]) |
a92a3ce7 | 1012 | handle_band(wiphy, band); |
b2e1b302 | 1013 | } |
560e28e1 | 1014 | if (wiphy->reg_notifier) |
716f9392 | 1015 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
1016 | } |
1017 | ||
1fa25e41 LR |
1018 | static void handle_channel_custom(struct wiphy *wiphy, |
1019 | enum ieee80211_band band, | |
1020 | unsigned int chan_idx, | |
1021 | const struct ieee80211_regdomain *regd) | |
1022 | { | |
1023 | int r; | |
1024 | u32 max_bandwidth = 0; | |
1025 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1026 | const struct ieee80211_power_rule *power_rule = NULL; | |
1027 | struct ieee80211_supported_band *sband; | |
1028 | struct ieee80211_channel *chan; | |
1029 | ||
1030 | sband = wiphy->bands[band]; | |
1031 | BUG_ON(chan_idx >= sband->n_channels); | |
1032 | chan = &sband->channels[chan_idx]; | |
1033 | ||
1034 | r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq), | |
1035 | &max_bandwidth, ®_rule, regd); | |
1036 | ||
1037 | if (r) { | |
1038 | chan->flags = IEEE80211_CHAN_DISABLED; | |
1039 | return; | |
1040 | } | |
1041 | ||
1042 | power_rule = ®_rule->power_rule; | |
1043 | ||
1044 | chan->flags |= map_regdom_flags(reg_rule->flags); | |
1045 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
1046 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
1047 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
1048 | } | |
1049 | ||
1050 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
1051 | const struct ieee80211_regdomain *regd) | |
1052 | { | |
1053 | unsigned int i; | |
1054 | struct ieee80211_supported_band *sband; | |
1055 | ||
1056 | BUG_ON(!wiphy->bands[band]); | |
1057 | sband = wiphy->bands[band]; | |
1058 | ||
1059 | for (i = 0; i < sband->n_channels; i++) | |
1060 | handle_channel_custom(wiphy, band, i, regd); | |
1061 | } | |
1062 | ||
1063 | /* Used by drivers prior to wiphy registration */ | |
1064 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1065 | const struct ieee80211_regdomain *regd) | |
1066 | { | |
1067 | enum ieee80211_band band; | |
1068 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1069 | if (wiphy->bands[band]) | |
1070 | handle_band_custom(wiphy, band, regd); | |
b2e1b302 LR |
1071 | } |
1072 | } | |
1fa25e41 LR |
1073 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1074 | ||
3e0c3ff3 LR |
1075 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
1076 | const struct ieee80211_regdomain *src_regd) | |
1077 | { | |
1078 | struct ieee80211_regdomain *regd; | |
1079 | int size_of_regd = 0; | |
1080 | unsigned int i; | |
1081 | ||
1082 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1083 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
1084 | ||
1085 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
1086 | if (!regd) | |
1087 | return -ENOMEM; | |
1088 | ||
1089 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
1090 | ||
1091 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
1092 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
1093 | sizeof(struct ieee80211_reg_rule)); | |
1094 | ||
1095 | *dst_regd = regd; | |
1096 | return 0; | |
1097 | } | |
b2e1b302 | 1098 | |
fb1fc7ad LR |
1099 | /* |
1100 | * Return value which can be used by ignore_request() to indicate | |
1101 | * it has been determined we should intersect two regulatory domains | |
1102 | */ | |
9c96477d LR |
1103 | #define REG_INTERSECT 1 |
1104 | ||
84fa4f43 JB |
1105 | /* This has the logic which determines when a new request |
1106 | * should be ignored. */ | |
1107 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
1108 | const char *alpha2) | |
1109 | { | |
806a9e39 | 1110 | struct wiphy *last_wiphy = NULL; |
761cf7ec LR |
1111 | |
1112 | assert_cfg80211_lock(); | |
1113 | ||
84fa4f43 JB |
1114 | /* All initial requests are respected */ |
1115 | if (!last_request) | |
1116 | return 0; | |
1117 | ||
1118 | switch (set_by) { | |
1119 | case REGDOM_SET_BY_INIT: | |
1120 | return -EINVAL; | |
1121 | case REGDOM_SET_BY_CORE: | |
ba25c141 | 1122 | return -EINVAL; |
84fa4f43 | 1123 | case REGDOM_SET_BY_COUNTRY_IE: |
806a9e39 LR |
1124 | |
1125 | last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); | |
1126 | ||
84fa4f43 JB |
1127 | if (unlikely(!is_an_alpha2(alpha2))) |
1128 | return -EINVAL; | |
1129 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 | 1130 | if (last_wiphy != wiphy) { |
84fa4f43 JB |
1131 | /* |
1132 | * Two cards with two APs claiming different | |
1133 | * different Country IE alpha2s. We could | |
1134 | * intersect them, but that seems unlikely | |
1135 | * to be correct. Reject second one for now. | |
1136 | */ | |
69b1572b | 1137 | if (regdom_changes(alpha2)) |
84fa4f43 JB |
1138 | return -EOPNOTSUPP; |
1139 | return -EALREADY; | |
1140 | } | |
fb1fc7ad LR |
1141 | /* |
1142 | * Two consecutive Country IE hints on the same wiphy. | |
1143 | * This should be picked up early by the driver/stack | |
1144 | */ | |
69b1572b | 1145 | if (WARN_ON(regdom_changes(alpha2))) |
84fa4f43 JB |
1146 | return 0; |
1147 | return -EALREADY; | |
1148 | } | |
3f2355cb | 1149 | return REG_INTERSECT; |
84fa4f43 | 1150 | case REGDOM_SET_BY_DRIVER: |
e74b1e7f LR |
1151 | if (last_request->initiator == REGDOM_SET_BY_CORE) { |
1152 | if (is_old_static_regdom(cfg80211_regdomain)) | |
1153 | return 0; | |
69b1572b | 1154 | if (regdom_changes(alpha2)) |
e74b1e7f | 1155 | return 0; |
84fa4f43 | 1156 | return -EALREADY; |
e74b1e7f | 1157 | } |
fff32c04 LR |
1158 | |
1159 | /* | |
1160 | * This would happen if you unplug and plug your card | |
1161 | * back in or if you add a new device for which the previously | |
1162 | * loaded card also agrees on the regulatory domain. | |
1163 | */ | |
1164 | if (last_request->initiator == REGDOM_SET_BY_DRIVER && | |
69b1572b | 1165 | !regdom_changes(alpha2)) |
fff32c04 LR |
1166 | return -EALREADY; |
1167 | ||
3e0c3ff3 | 1168 | return REG_INTERSECT; |
84fa4f43 | 1169 | case REGDOM_SET_BY_USER: |
84fa4f43 | 1170 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) |
9c96477d | 1171 | return REG_INTERSECT; |
fb1fc7ad LR |
1172 | /* |
1173 | * If the user knows better the user should set the regdom | |
1174 | * to their country before the IE is picked up | |
1175 | */ | |
3f2355cb LR |
1176 | if (last_request->initiator == REGDOM_SET_BY_USER && |
1177 | last_request->intersect) | |
1178 | return -EOPNOTSUPP; | |
fb1fc7ad LR |
1179 | /* |
1180 | * Process user requests only after previous user/driver/core | |
1181 | * requests have been processed | |
1182 | */ | |
5eebade6 LR |
1183 | if (last_request->initiator == REGDOM_SET_BY_CORE || |
1184 | last_request->initiator == REGDOM_SET_BY_DRIVER || | |
1185 | last_request->initiator == REGDOM_SET_BY_USER) { | |
69b1572b | 1186 | if (regdom_changes(last_request->alpha2)) |
5eebade6 LR |
1187 | return -EAGAIN; |
1188 | } | |
1189 | ||
e74b1e7f | 1190 | if (!is_old_static_regdom(cfg80211_regdomain) && |
69b1572b | 1191 | !regdom_changes(alpha2)) |
e74b1e7f LR |
1192 | return -EALREADY; |
1193 | ||
84fa4f43 JB |
1194 | return 0; |
1195 | } | |
1196 | ||
1197 | return -EINVAL; | |
1198 | } | |
1199 | ||
a1794390 | 1200 | /* Caller must hold &cfg80211_mutex */ |
b2e1b302 | 1201 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, |
3f2355cb LR |
1202 | const char *alpha2, |
1203 | u32 country_ie_checksum, | |
1204 | enum environment_cap env) | |
b2e1b302 LR |
1205 | { |
1206 | struct regulatory_request *request; | |
9c96477d | 1207 | bool intersect = false; |
b2e1b302 LR |
1208 | int r = 0; |
1209 | ||
761cf7ec LR |
1210 | assert_cfg80211_lock(); |
1211 | ||
be3d4810 | 1212 | r = ignore_request(wiphy, set_by, alpha2); |
9c96477d | 1213 | |
3e0c3ff3 LR |
1214 | if (r == REG_INTERSECT) { |
1215 | if (set_by == REGDOM_SET_BY_DRIVER) { | |
1216 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); | |
1217 | if (r) | |
1218 | return r; | |
1219 | } | |
9c96477d | 1220 | intersect = true; |
3e0c3ff3 | 1221 | } else if (r) { |
fb1fc7ad LR |
1222 | /* |
1223 | * If the regulatory domain being requested by the | |
3e0c3ff3 | 1224 | * driver has already been set just copy it to the |
fb1fc7ad LR |
1225 | * wiphy |
1226 | */ | |
3e0c3ff3 LR |
1227 | if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) { |
1228 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); | |
1229 | if (r) | |
1230 | return r; | |
1231 | r = -EALREADY; | |
1232 | goto new_request; | |
1233 | } | |
b2e1b302 | 1234 | return r; |
3e0c3ff3 | 1235 | } |
b2e1b302 | 1236 | |
3e0c3ff3 | 1237 | new_request: |
5203cdb6 LR |
1238 | request = kzalloc(sizeof(struct regulatory_request), |
1239 | GFP_KERNEL); | |
1240 | if (!request) | |
1241 | return -ENOMEM; | |
1242 | ||
1243 | request->alpha2[0] = alpha2[0]; | |
1244 | request->alpha2[1] = alpha2[1]; | |
1245 | request->initiator = set_by; | |
806a9e39 | 1246 | request->wiphy_idx = get_wiphy_idx(wiphy); |
5203cdb6 | 1247 | request->intersect = intersect; |
3f2355cb LR |
1248 | request->country_ie_checksum = country_ie_checksum; |
1249 | request->country_ie_env = env; | |
5203cdb6 LR |
1250 | |
1251 | kfree(last_request); | |
1252 | last_request = request; | |
3e0c3ff3 LR |
1253 | |
1254 | /* When r == REG_INTERSECT we do need to call CRDA */ | |
1255 | if (r < 0) | |
1256 | return r; | |
1257 | ||
3f2355cb LR |
1258 | /* |
1259 | * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled | |
1260 | * AND if CRDA is NOT present nothing will happen, if someone | |
1261 | * wants to bother with 11d with OLD_REG you can add a timer. | |
1262 | * If after x amount of time nothing happens you can call: | |
1263 | * | |
1264 | * return set_regdom(country_ie_regdomain); | |
1265 | * | |
1266 | * to intersect with the static rd | |
1267 | */ | |
02ba0b32 | 1268 | return call_crda(alpha2); |
b2e1b302 LR |
1269 | } |
1270 | ||
fe33eb39 LR |
1271 | /* This currently only processes user and driver regulatory hints */ |
1272 | static int reg_process_hint(struct regulatory_request *reg_request) | |
1273 | { | |
1274 | int r = 0; | |
1275 | struct wiphy *wiphy = NULL; | |
1276 | ||
1277 | BUG_ON(!reg_request->alpha2); | |
1278 | ||
1279 | mutex_lock(&cfg80211_mutex); | |
1280 | ||
1281 | if (wiphy_idx_valid(reg_request->wiphy_idx)) | |
1282 | wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); | |
1283 | ||
1284 | if (reg_request->initiator == REGDOM_SET_BY_DRIVER && | |
1285 | !wiphy) { | |
1286 | r = -ENODEV; | |
1287 | goto out; | |
1288 | } | |
1289 | ||
1290 | r = __regulatory_hint(wiphy, | |
1291 | reg_request->initiator, | |
1292 | reg_request->alpha2, | |
1293 | reg_request->country_ie_checksum, | |
1294 | reg_request->country_ie_env); | |
1295 | /* This is required so that the orig_* parameters are saved */ | |
1296 | if (r == -EALREADY && wiphy && wiphy->strict_regulatory) | |
1297 | wiphy_update_regulatory(wiphy, reg_request->initiator); | |
1298 | out: | |
1299 | mutex_unlock(&cfg80211_mutex); | |
1300 | ||
1301 | if (r == -EALREADY) | |
1302 | r = 0; | |
1303 | ||
1304 | return r; | |
1305 | } | |
1306 | ||
1307 | static void reg_process_pending_hints(void) | |
1308 | { | |
1309 | struct regulatory_request *reg_request; | |
1310 | int r; | |
1311 | ||
1312 | spin_lock(®_requests_lock); | |
1313 | while (!list_empty(®_requests_list)) { | |
1314 | reg_request = list_first_entry(®_requests_list, | |
1315 | struct regulatory_request, | |
1316 | list); | |
1317 | list_del_init(®_request->list); | |
1318 | spin_unlock(®_requests_lock); | |
1319 | ||
1320 | r = reg_process_hint(reg_request); | |
1321 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1322 | if (r && (reg_request->initiator == REGDOM_SET_BY_DRIVER || | |
1323 | reg_request->initiator == REGDOM_SET_BY_COUNTRY_IE)) | |
1324 | printk(KERN_ERR "cfg80211: wiphy_idx %d sent a " | |
1325 | "regulatory hint for %c%c but now has " | |
1326 | "gone fishing, ignoring request\n", | |
1327 | reg_request->wiphy_idx, | |
1328 | reg_request->alpha2[0], | |
1329 | reg_request->alpha2[1]); | |
1330 | #endif | |
1331 | kfree(reg_request); | |
1332 | spin_lock(®_requests_lock); | |
1333 | } | |
1334 | spin_unlock(®_requests_lock); | |
1335 | } | |
1336 | ||
1337 | static void reg_todo(struct work_struct *work) | |
1338 | { | |
1339 | reg_process_pending_hints(); | |
1340 | } | |
1341 | ||
1342 | static DECLARE_WORK(reg_work, reg_todo); | |
1343 | ||
1344 | static void queue_regulatory_request(struct regulatory_request *request) | |
1345 | { | |
1346 | spin_lock(®_requests_lock); | |
1347 | list_add_tail(&request->list, ®_requests_list); | |
1348 | spin_unlock(®_requests_lock); | |
1349 | ||
1350 | schedule_work(®_work); | |
1351 | } | |
1352 | ||
1353 | /* Core regulatory hint -- happens once during cfg80211_init() */ | |
ba25c141 LR |
1354 | static int regulatory_hint_core(const char *alpha2) |
1355 | { | |
1356 | struct regulatory_request *request; | |
1357 | ||
1358 | BUG_ON(last_request); | |
1359 | ||
1360 | request = kzalloc(sizeof(struct regulatory_request), | |
1361 | GFP_KERNEL); | |
1362 | if (!request) | |
1363 | return -ENOMEM; | |
1364 | ||
1365 | request->alpha2[0] = alpha2[0]; | |
1366 | request->alpha2[1] = alpha2[1]; | |
1367 | request->initiator = REGDOM_SET_BY_CORE; | |
1368 | ||
fe33eb39 | 1369 | queue_regulatory_request(request); |
ba25c141 | 1370 | |
fe33eb39 | 1371 | return 0; |
ba25c141 LR |
1372 | } |
1373 | ||
fe33eb39 LR |
1374 | /* User hints */ |
1375 | int regulatory_hint_user(const char *alpha2) | |
b2e1b302 | 1376 | { |
fe33eb39 LR |
1377 | struct regulatory_request *request; |
1378 | ||
be3d4810 | 1379 | BUG_ON(!alpha2); |
b2e1b302 | 1380 | |
fe33eb39 LR |
1381 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1382 | if (!request) | |
1383 | return -ENOMEM; | |
1384 | ||
1385 | request->wiphy_idx = WIPHY_IDX_STALE; | |
1386 | request->alpha2[0] = alpha2[0]; | |
1387 | request->alpha2[1] = alpha2[1]; | |
1388 | request->initiator = REGDOM_SET_BY_USER, | |
1389 | ||
1390 | queue_regulatory_request(request); | |
1391 | ||
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | /* Driver hints */ | |
1396 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
1397 | { | |
1398 | struct regulatory_request *request; | |
1399 | ||
1400 | BUG_ON(!alpha2); | |
1401 | BUG_ON(!wiphy); | |
1402 | ||
1403 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); | |
1404 | if (!request) | |
1405 | return -ENOMEM; | |
1406 | ||
1407 | request->wiphy_idx = get_wiphy_idx(wiphy); | |
1408 | ||
1409 | /* Must have registered wiphy first */ | |
1410 | BUG_ON(!wiphy_idx_valid(request->wiphy_idx)); | |
1411 | ||
1412 | request->alpha2[0] = alpha2[0]; | |
1413 | request->alpha2[1] = alpha2[1]; | |
1414 | request->initiator = REGDOM_SET_BY_DRIVER; | |
1415 | ||
1416 | queue_regulatory_request(request); | |
1417 | ||
1418 | return 0; | |
b2e1b302 LR |
1419 | } |
1420 | EXPORT_SYMBOL(regulatory_hint); | |
1421 | ||
3f2355cb LR |
1422 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, |
1423 | u32 country_ie_checksum) | |
1424 | { | |
806a9e39 LR |
1425 | struct wiphy *request_wiphy; |
1426 | ||
761cf7ec LR |
1427 | assert_cfg80211_lock(); |
1428 | ||
806a9e39 LR |
1429 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1430 | ||
1431 | if (!request_wiphy) | |
3f2355cb | 1432 | return false; |
806a9e39 LR |
1433 | |
1434 | if (likely(request_wiphy != wiphy)) | |
3f2355cb | 1435 | return !country_ie_integrity_changes(country_ie_checksum); |
fb1fc7ad LR |
1436 | /* |
1437 | * We should not have let these through at this point, they | |
3f2355cb | 1438 | * should have been picked up earlier by the first alpha2 check |
fb1fc7ad LR |
1439 | * on the device |
1440 | */ | |
3f2355cb LR |
1441 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) |
1442 | return true; | |
1443 | return false; | |
1444 | } | |
1445 | ||
1446 | void regulatory_hint_11d(struct wiphy *wiphy, | |
1447 | u8 *country_ie, | |
1448 | u8 country_ie_len) | |
1449 | { | |
1450 | struct ieee80211_regdomain *rd = NULL; | |
1451 | char alpha2[2]; | |
1452 | u32 checksum = 0; | |
1453 | enum environment_cap env = ENVIRON_ANY; | |
fe33eb39 | 1454 | struct regulatory_request *request; |
3f2355cb | 1455 | |
a1794390 | 1456 | mutex_lock(&cfg80211_mutex); |
3f2355cb | 1457 | |
d335fe63 LR |
1458 | if (unlikely(!last_request)) { |
1459 | mutex_unlock(&cfg80211_mutex); | |
1460 | return; | |
1461 | } | |
1462 | ||
3f2355cb LR |
1463 | /* IE len must be evenly divisible by 2 */ |
1464 | if (country_ie_len & 0x01) | |
1465 | goto out; | |
1466 | ||
1467 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1468 | goto out; | |
1469 | ||
fb1fc7ad LR |
1470 | /* |
1471 | * Pending country IE processing, this can happen after we | |
3f2355cb | 1472 | * call CRDA and wait for a response if a beacon was received before |
fb1fc7ad LR |
1473 | * we were able to process the last regulatory_hint_11d() call |
1474 | */ | |
3f2355cb LR |
1475 | if (country_ie_regdomain) |
1476 | goto out; | |
1477 | ||
1478 | alpha2[0] = country_ie[0]; | |
1479 | alpha2[1] = country_ie[1]; | |
1480 | ||
1481 | if (country_ie[2] == 'I') | |
1482 | env = ENVIRON_INDOOR; | |
1483 | else if (country_ie[2] == 'O') | |
1484 | env = ENVIRON_OUTDOOR; | |
1485 | ||
fb1fc7ad LR |
1486 | /* |
1487 | * We will run this for *every* beacon processed for the BSSID, so | |
3f2355cb | 1488 | * we optimize an early check to exit out early if we don't have to |
fb1fc7ad LR |
1489 | * do anything |
1490 | */ | |
806a9e39 | 1491 | if (likely(wiphy_idx_valid(last_request->wiphy_idx))) { |
3f2355cb LR |
1492 | struct cfg80211_registered_device *drv_last_ie; |
1493 | ||
806a9e39 LR |
1494 | drv_last_ie = |
1495 | cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx); | |
3f2355cb | 1496 | |
fb1fc7ad LR |
1497 | /* |
1498 | * Lets keep this simple -- we trust the first AP | |
1499 | * after we intersect with CRDA | |
1500 | */ | |
806a9e39 | 1501 | if (likely(&drv_last_ie->wiphy == wiphy)) { |
fb1fc7ad LR |
1502 | /* |
1503 | * Ignore IEs coming in on this wiphy with | |
1504 | * the same alpha2 and environment cap | |
1505 | */ | |
3f2355cb LR |
1506 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, |
1507 | alpha2) && | |
1508 | env == drv_last_ie->env)) { | |
1509 | goto out; | |
1510 | } | |
fb1fc7ad LR |
1511 | /* |
1512 | * the wiphy moved on to another BSSID or the AP | |
3f2355cb LR |
1513 | * was reconfigured. XXX: We need to deal with the |
1514 | * case where the user suspends and goes to goes | |
1515 | * to another country, and then gets IEs from an | |
fb1fc7ad LR |
1516 | * AP with different settings |
1517 | */ | |
3f2355cb LR |
1518 | goto out; |
1519 | } else { | |
fb1fc7ad LR |
1520 | /* |
1521 | * Ignore IEs coming in on two separate wiphys with | |
1522 | * the same alpha2 and environment cap | |
1523 | */ | |
3f2355cb LR |
1524 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, |
1525 | alpha2) && | |
1526 | env == drv_last_ie->env)) { | |
1527 | goto out; | |
1528 | } | |
1529 | /* We could potentially intersect though */ | |
1530 | goto out; | |
1531 | } | |
1532 | } | |
1533 | ||
1534 | rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); | |
1535 | if (!rd) | |
1536 | goto out; | |
1537 | ||
915278e0 LR |
1538 | /* |
1539 | * This will not happen right now but we leave it here for the | |
3f2355cb LR |
1540 | * the future when we want to add suspend/resume support and having |
1541 | * the user move to another country after doing so, or having the user | |
915278e0 LR |
1542 | * move to another AP. Right now we just trust the first AP. |
1543 | * | |
1544 | * If we hit this before we add this support we want to be informed of | |
1545 | * it as it would indicate a mistake in the current design | |
1546 | */ | |
1547 | if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum))) | |
0441d6ff | 1548 | goto free_rd_out; |
3f2355cb | 1549 | |
fe33eb39 LR |
1550 | request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); |
1551 | if (!request) | |
1552 | goto free_rd_out; | |
1553 | ||
fb1fc7ad LR |
1554 | /* |
1555 | * We keep this around for when CRDA comes back with a response so | |
1556 | * we can intersect with that | |
1557 | */ | |
3f2355cb LR |
1558 | country_ie_regdomain = rd; |
1559 | ||
fe33eb39 LR |
1560 | request->wiphy_idx = get_wiphy_idx(wiphy); |
1561 | request->alpha2[0] = rd->alpha2[0]; | |
1562 | request->alpha2[1] = rd->alpha2[1]; | |
1563 | request->initiator = REGDOM_SET_BY_COUNTRY_IE; | |
1564 | request->country_ie_checksum = checksum; | |
1565 | request->country_ie_env = env; | |
1566 | ||
1567 | mutex_unlock(&cfg80211_mutex); | |
3f2355cb | 1568 | |
fe33eb39 LR |
1569 | queue_regulatory_request(request); |
1570 | ||
1571 | return; | |
0441d6ff LR |
1572 | |
1573 | free_rd_out: | |
1574 | kfree(rd); | |
3f2355cb | 1575 | out: |
a1794390 | 1576 | mutex_unlock(&cfg80211_mutex); |
3f2355cb LR |
1577 | } |
1578 | EXPORT_SYMBOL(regulatory_hint_11d); | |
b2e1b302 | 1579 | |
a3d2eaf0 | 1580 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1581 | { |
1582 | unsigned int i; | |
a3d2eaf0 JB |
1583 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1584 | const struct ieee80211_freq_range *freq_range = NULL; | |
1585 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
1586 | |
1587 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
1588 | "(max_antenna_gain, max_eirp)\n"); | |
1589 | ||
1590 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1591 | reg_rule = &rd->reg_rules[i]; | |
1592 | freq_range = ®_rule->freq_range; | |
1593 | power_rule = ®_rule->power_rule; | |
1594 | ||
fb1fc7ad LR |
1595 | /* |
1596 | * There may not be documentation for max antenna gain | |
1597 | * in certain regions | |
1598 | */ | |
b2e1b302 LR |
1599 | if (power_rule->max_antenna_gain) |
1600 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1601 | "(%d mBi, %d mBm)\n", | |
1602 | freq_range->start_freq_khz, | |
1603 | freq_range->end_freq_khz, | |
1604 | freq_range->max_bandwidth_khz, | |
1605 | power_rule->max_antenna_gain, | |
1606 | power_rule->max_eirp); | |
1607 | else | |
1608 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1609 | "(N/A, %d mBm)\n", | |
1610 | freq_range->start_freq_khz, | |
1611 | freq_range->end_freq_khz, | |
1612 | freq_range->max_bandwidth_khz, | |
1613 | power_rule->max_eirp); | |
1614 | } | |
1615 | } | |
1616 | ||
a3d2eaf0 | 1617 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1618 | { |
1619 | ||
3f2355cb | 1620 | if (is_intersected_alpha2(rd->alpha2)) { |
3f2355cb LR |
1621 | |
1622 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
806a9e39 LR |
1623 | struct cfg80211_registered_device *drv; |
1624 | drv = cfg80211_drv_by_wiphy_idx( | |
1625 | last_request->wiphy_idx); | |
1626 | if (drv) { | |
3f2355cb LR |
1627 | printk(KERN_INFO "cfg80211: Current regulatory " |
1628 | "domain updated by AP to: %c%c\n", | |
1629 | drv->country_ie_alpha2[0], | |
1630 | drv->country_ie_alpha2[1]); | |
1631 | } else | |
1632 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1633 | "domain intersected: \n"); | |
1634 | } else | |
1635 | printk(KERN_INFO "cfg80211: Current regulatory " | |
039498c6 | 1636 | "domain intersected: \n"); |
3f2355cb | 1637 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
1638 | printk(KERN_INFO "cfg80211: World regulatory " |
1639 | "domain updated:\n"); | |
1640 | else { | |
1641 | if (is_unknown_alpha2(rd->alpha2)) | |
1642 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1643 | "changed to driver built-in settings " | |
1644 | "(unknown country)\n"); | |
1645 | else | |
1646 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1647 | "changed to country: %c%c\n", | |
1648 | rd->alpha2[0], rd->alpha2[1]); | |
1649 | } | |
1650 | print_rd_rules(rd); | |
1651 | } | |
1652 | ||
2df78167 | 1653 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1654 | { |
1655 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1656 | rd->alpha2[0], rd->alpha2[1]); | |
1657 | print_rd_rules(rd); | |
1658 | } | |
1659 | ||
3f2355cb LR |
1660 | #ifdef CONFIG_CFG80211_REG_DEBUG |
1661 | static void reg_country_ie_process_debug( | |
1662 | const struct ieee80211_regdomain *rd, | |
1663 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1664 | const struct ieee80211_regdomain *intersected_rd) | |
1665 | { | |
1666 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
1667 | print_regdomain_info(country_ie_regdomain); | |
1668 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
1669 | print_regdomain_info(rd); | |
1670 | if (intersected_rd) { | |
1671 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
1672 | "and get:\n"); | |
667ecd01 | 1673 | print_regdomain_info(intersected_rd); |
3f2355cb LR |
1674 | return; |
1675 | } | |
1676 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
1677 | } | |
1678 | #else | |
1679 | static inline void reg_country_ie_process_debug( | |
1680 | const struct ieee80211_regdomain *rd, | |
1681 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1682 | const struct ieee80211_regdomain *intersected_rd) | |
1683 | { | |
1684 | } | |
1685 | #endif | |
1686 | ||
d2372b31 | 1687 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1688 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1689 | { |
9c96477d | 1690 | const struct ieee80211_regdomain *intersected_rd = NULL; |
3f2355cb | 1691 | struct cfg80211_registered_device *drv = NULL; |
806a9e39 | 1692 | struct wiphy *request_wiphy; |
b2e1b302 LR |
1693 | /* Some basic sanity checks first */ |
1694 | ||
b2e1b302 | 1695 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1696 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1697 | return -EINVAL; |
1698 | update_world_regdomain(rd); | |
1699 | return 0; | |
1700 | } | |
b2e1b302 LR |
1701 | |
1702 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1703 | !is_unknown_alpha2(rd->alpha2)) | |
1704 | return -EINVAL; | |
1705 | ||
f6037d09 | 1706 | if (!last_request) |
b2e1b302 LR |
1707 | return -EINVAL; |
1708 | ||
fb1fc7ad LR |
1709 | /* |
1710 | * Lets only bother proceeding on the same alpha2 if the current | |
3f2355cb | 1711 | * rd is non static (it means CRDA was present and was used last) |
fb1fc7ad LR |
1712 | * and the pending request came in from a country IE |
1713 | */ | |
3f2355cb | 1714 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { |
fb1fc7ad LR |
1715 | /* |
1716 | * If someone else asked us to change the rd lets only bother | |
1717 | * checking if the alpha2 changes if CRDA was already called | |
1718 | */ | |
3f2355cb | 1719 | if (!is_old_static_regdom(cfg80211_regdomain) && |
69b1572b | 1720 | !regdom_changes(rd->alpha2)) |
3f2355cb LR |
1721 | return -EINVAL; |
1722 | } | |
1723 | ||
fb1fc7ad LR |
1724 | /* |
1725 | * Now lets set the regulatory domain, update all driver channels | |
b2e1b302 LR |
1726 | * and finally inform them of what we have done, in case they want |
1727 | * to review or adjust their own settings based on their own | |
fb1fc7ad LR |
1728 | * internal EEPROM data |
1729 | */ | |
b2e1b302 | 1730 | |
f6037d09 | 1731 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1732 | return -EINVAL; |
1733 | ||
8375af3b LR |
1734 | if (!is_valid_rd(rd)) { |
1735 | printk(KERN_ERR "cfg80211: Invalid " | |
1736 | "regulatory domain detected:\n"); | |
1737 | print_regdomain_info(rd); | |
1738 | return -EINVAL; | |
b2e1b302 LR |
1739 | } |
1740 | ||
806a9e39 LR |
1741 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1742 | ||
b8295acd | 1743 | if (!last_request->intersect) { |
3e0c3ff3 LR |
1744 | int r; |
1745 | ||
1746 | if (last_request->initiator != REGDOM_SET_BY_DRIVER) { | |
1747 | reset_regdomains(); | |
1748 | cfg80211_regdomain = rd; | |
1749 | return 0; | |
1750 | } | |
1751 | ||
fb1fc7ad LR |
1752 | /* |
1753 | * For a driver hint, lets copy the regulatory domain the | |
1754 | * driver wanted to the wiphy to deal with conflicts | |
1755 | */ | |
3e0c3ff3 | 1756 | |
806a9e39 | 1757 | BUG_ON(request_wiphy->regd); |
3e0c3ff3 | 1758 | |
806a9e39 | 1759 | r = reg_copy_regd(&request_wiphy->regd, rd); |
3e0c3ff3 LR |
1760 | if (r) |
1761 | return r; | |
1762 | ||
b8295acd LR |
1763 | reset_regdomains(); |
1764 | cfg80211_regdomain = rd; | |
1765 | return 0; | |
1766 | } | |
1767 | ||
1768 | /* Intersection requires a bit more work */ | |
1769 | ||
1770 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
1771 | ||
9c96477d LR |
1772 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
1773 | if (!intersected_rd) | |
1774 | return -EINVAL; | |
b8295acd | 1775 | |
fb1fc7ad LR |
1776 | /* |
1777 | * We can trash what CRDA provided now. | |
3e0c3ff3 | 1778 | * However if a driver requested this specific regulatory |
fb1fc7ad LR |
1779 | * domain we keep it for its private use |
1780 | */ | |
3e0c3ff3 | 1781 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) |
806a9e39 | 1782 | request_wiphy->regd = rd; |
3e0c3ff3 LR |
1783 | else |
1784 | kfree(rd); | |
1785 | ||
b8295acd LR |
1786 | rd = NULL; |
1787 | ||
1788 | reset_regdomains(); | |
1789 | cfg80211_regdomain = intersected_rd; | |
1790 | ||
1791 | return 0; | |
9c96477d LR |
1792 | } |
1793 | ||
3f2355cb LR |
1794 | /* |
1795 | * Country IE requests are handled a bit differently, we intersect | |
1796 | * the country IE rd with what CRDA believes that country should have | |
1797 | */ | |
1798 | ||
1799 | BUG_ON(!country_ie_regdomain); | |
1800 | ||
1801 | if (rd != country_ie_regdomain) { | |
fb1fc7ad LR |
1802 | /* |
1803 | * Intersect what CRDA returned and our what we | |
1804 | * had built from the Country IE received | |
1805 | */ | |
3f2355cb LR |
1806 | |
1807 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); | |
1808 | ||
1809 | reg_country_ie_process_debug(rd, country_ie_regdomain, | |
1810 | intersected_rd); | |
1811 | ||
1812 | kfree(country_ie_regdomain); | |
1813 | country_ie_regdomain = NULL; | |
1814 | } else { | |
fb1fc7ad LR |
1815 | /* |
1816 | * This would happen when CRDA was not present and | |
3f2355cb | 1817 | * OLD_REGULATORY was enabled. We intersect our Country |
fb1fc7ad LR |
1818 | * IE rd and what was set on cfg80211 originally |
1819 | */ | |
3f2355cb LR |
1820 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
1821 | } | |
1822 | ||
1823 | if (!intersected_rd) | |
1824 | return -EINVAL; | |
1825 | ||
806a9e39 | 1826 | drv = wiphy_to_dev(request_wiphy); |
3f2355cb LR |
1827 | |
1828 | drv->country_ie_alpha2[0] = rd->alpha2[0]; | |
1829 | drv->country_ie_alpha2[1] = rd->alpha2[1]; | |
1830 | drv->env = last_request->country_ie_env; | |
1831 | ||
1832 | BUG_ON(intersected_rd == rd); | |
1833 | ||
1834 | kfree(rd); | |
1835 | rd = NULL; | |
1836 | ||
b8295acd | 1837 | reset_regdomains(); |
3f2355cb | 1838 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
1839 | |
1840 | return 0; | |
1841 | } | |
1842 | ||
1843 | ||
fb1fc7ad LR |
1844 | /* |
1845 | * Use this call to set the current regulatory domain. Conflicts with | |
b2e1b302 | 1846 | * multiple drivers can be ironed out later. Caller must've already |
fb1fc7ad LR |
1847 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex |
1848 | */ | |
a3d2eaf0 | 1849 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1850 | { |
b2e1b302 LR |
1851 | int r; |
1852 | ||
761cf7ec LR |
1853 | assert_cfg80211_lock(); |
1854 | ||
b2e1b302 LR |
1855 | /* Note that this doesn't update the wiphys, this is done below */ |
1856 | r = __set_regdom(rd); | |
d2372b31 JB |
1857 | if (r) { |
1858 | kfree(rd); | |
b2e1b302 | 1859 | return r; |
d2372b31 | 1860 | } |
b2e1b302 | 1861 | |
b2e1b302 | 1862 | /* This would make this whole thing pointless */ |
a01ddafd LR |
1863 | if (!last_request->intersect) |
1864 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
1865 | |
1866 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 1867 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 1868 | |
a01ddafd | 1869 | print_regdomain(cfg80211_regdomain); |
b2e1b302 LR |
1870 | |
1871 | return r; | |
1872 | } | |
1873 | ||
a1794390 | 1874 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
1875 | void reg_device_remove(struct wiphy *wiphy) |
1876 | { | |
806a9e39 LR |
1877 | struct wiphy *request_wiphy; |
1878 | ||
761cf7ec LR |
1879 | assert_cfg80211_lock(); |
1880 | ||
806a9e39 LR |
1881 | request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); |
1882 | ||
3e0c3ff3 | 1883 | kfree(wiphy->regd); |
806a9e39 | 1884 | if (!last_request || !request_wiphy) |
3f2355cb | 1885 | return; |
806a9e39 | 1886 | if (request_wiphy != wiphy) |
3f2355cb | 1887 | return; |
806a9e39 | 1888 | last_request->wiphy_idx = WIPHY_IDX_STALE; |
3f2355cb LR |
1889 | last_request->country_ie_env = ENVIRON_ANY; |
1890 | } | |
1891 | ||
b2e1b302 LR |
1892 | int regulatory_init(void) |
1893 | { | |
bcf4f99b | 1894 | int err = 0; |
734366de | 1895 | |
b2e1b302 LR |
1896 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
1897 | if (IS_ERR(reg_pdev)) | |
1898 | return PTR_ERR(reg_pdev); | |
734366de | 1899 | |
fe33eb39 LR |
1900 | spin_lock_init(®_requests_lock); |
1901 | ||
734366de | 1902 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY |
a3d2eaf0 | 1903 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 1904 | |
942b25cf | 1905 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de | 1906 | print_regdomain_info(cfg80211_regdomain); |
fb1fc7ad LR |
1907 | /* |
1908 | * The old code still requests for a new regdomain and if | |
734366de JB |
1909 | * you have CRDA you get it updated, otherwise you get |
1910 | * stuck with the static values. We ignore "EU" code as | |
fb1fc7ad LR |
1911 | * that is not a valid ISO / IEC 3166 alpha2 |
1912 | */ | |
ac9440a4 | 1913 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') |
ba25c141 | 1914 | err = regulatory_hint_core(ieee80211_regdom); |
734366de | 1915 | #else |
a3d2eaf0 | 1916 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 1917 | |
ba25c141 | 1918 | err = regulatory_hint_core("00"); |
bcf4f99b | 1919 | #endif |
ba25c141 | 1920 | if (err) { |
bcf4f99b LR |
1921 | if (err == -ENOMEM) |
1922 | return err; | |
1923 | /* | |
1924 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
1925 | * memory which is handled and propagated appropriately above | |
1926 | * but it can also fail during a netlink_broadcast() or during | |
1927 | * early boot for call_usermodehelper(). For now treat these | |
1928 | * errors as non-fatal. | |
1929 | */ | |
1930 | printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " | |
1931 | "to call CRDA during init"); | |
1932 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1933 | /* We want to find out exactly why when debugging */ | |
1934 | WARN_ON(err); | |
734366de | 1935 | #endif |
bcf4f99b | 1936 | } |
734366de | 1937 | |
b2e1b302 LR |
1938 | return 0; |
1939 | } | |
1940 | ||
1941 | void regulatory_exit(void) | |
1942 | { | |
fe33eb39 LR |
1943 | struct regulatory_request *reg_request, *tmp; |
1944 | ||
1945 | cancel_work_sync(®_work); | |
1946 | ||
a1794390 | 1947 | mutex_lock(&cfg80211_mutex); |
734366de | 1948 | |
b2e1b302 | 1949 | reset_regdomains(); |
734366de | 1950 | |
3f2355cb LR |
1951 | kfree(country_ie_regdomain); |
1952 | country_ie_regdomain = NULL; | |
1953 | ||
f6037d09 JB |
1954 | kfree(last_request); |
1955 | ||
b2e1b302 | 1956 | platform_device_unregister(reg_pdev); |
734366de | 1957 | |
fe33eb39 LR |
1958 | spin_lock(®_requests_lock); |
1959 | if (!list_empty(®_requests_list)) { | |
1960 | list_for_each_entry_safe(reg_request, tmp, | |
1961 | ®_requests_list, list) { | |
1962 | list_del(®_request->list); | |
1963 | kfree(reg_request); | |
1964 | } | |
1965 | } | |
1966 | spin_unlock(®_requests_lock); | |
1967 | ||
a1794390 | 1968 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 1969 | } |