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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 LR |
45 | /** |
46 | * struct regulatory_request - receipt of last regulatory request | |
47 | * | |
48 | * @wiphy: this is set if this request's initiator is | |
49 | * %REGDOM_SET_BY_COUNTRY_IE or %REGDOM_SET_BY_DRIVER. This | |
50 | * can be used by the wireless core to deal with conflicts | |
51 | * and potentially inform users of which devices specifically | |
52 | * cased the conflicts. | |
53 | * @initiator: indicates who sent this request, could be any of | |
54 | * of those set in reg_set_by, %REGDOM_SET_BY_* | |
55 | * @alpha2: the ISO / IEC 3166 alpha2 country code of the requested | |
56 | * regulatory domain. We have a few special codes: | |
57 | * 00 - World regulatory domain | |
58 | * 99 - built by driver but a specific alpha2 cannot be determined | |
59 | * 98 - result of an intersection between two regulatory domains | |
60 | * @intersect: indicates whether the wireless core should intersect | |
61 | * the requested regulatory domain with the presently set regulatory | |
62 | * domain. | |
3f2355cb LR |
63 | * @country_ie_checksum: checksum of the last processed and accepted |
64 | * country IE | |
65 | * @country_ie_env: lets us know if the AP is telling us we are outdoor, | |
66 | * indoor, or if it doesn't matter | |
be3d4810 | 67 | */ |
734366de | 68 | struct regulatory_request { |
734366de | 69 | struct wiphy *wiphy; |
734366de JB |
70 | enum reg_set_by initiator; |
71 | char alpha2[2]; | |
9c96477d | 72 | bool intersect; |
3f2355cb LR |
73 | u32 country_ie_checksum; |
74 | enum environment_cap country_ie_env; | |
734366de JB |
75 | }; |
76 | ||
5166ccd2 | 77 | /* Receipt of information from last regulatory request */ |
f6037d09 | 78 | static struct regulatory_request *last_request; |
734366de | 79 | |
b2e1b302 LR |
80 | /* To trigger userspace events */ |
81 | static struct platform_device *reg_pdev; | |
8318d78a | 82 | |
b2e1b302 LR |
83 | /* Keep the ordering from large to small */ |
84 | static u32 supported_bandwidths[] = { | |
85 | MHZ_TO_KHZ(40), | |
86 | MHZ_TO_KHZ(20), | |
8318d78a JB |
87 | }; |
88 | ||
734366de JB |
89 | /* Central wireless core regulatory domains, we only need two, |
90 | * the current one and a world regulatory domain in case we have no | |
91 | * information to give us an alpha2 */ | |
a3d2eaf0 | 92 | static const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 93 | |
3f2355cb LR |
94 | /* We use this as a place for the rd structure built from the |
95 | * last parsed country IE to rest until CRDA gets back to us with | |
96 | * what it thinks should apply for the same country */ | |
97 | static const struct ieee80211_regdomain *country_ie_regdomain; | |
98 | ||
734366de JB |
99 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
100 | static const struct ieee80211_regdomain world_regdom = { | |
101 | .n_reg_rules = 1, | |
102 | .alpha2 = "00", | |
103 | .reg_rules = { | |
104 | REG_RULE(2412-10, 2462+10, 40, 6, 20, | |
105 | NL80211_RRF_PASSIVE_SCAN | | |
106 | NL80211_RRF_NO_IBSS), | |
107 | } | |
108 | }; | |
109 | ||
a3d2eaf0 JB |
110 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
111 | &world_regdom; | |
734366de JB |
112 | |
113 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
114 | static char *ieee80211_regdom = "US"; | |
115 | module_param(ieee80211_regdom, charp, 0444); | |
116 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
117 | ||
118 | /* We assume 40 MHz bandwidth for the old regulatory work. | |
119 | * We make emphasis we are using the exact same frequencies | |
120 | * as before */ | |
121 | ||
122 | static const struct ieee80211_regdomain us_regdom = { | |
123 | .n_reg_rules = 6, | |
124 | .alpha2 = "US", | |
125 | .reg_rules = { | |
126 | /* IEEE 802.11b/g, channels 1..11 */ | |
127 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
128 | /* IEEE 802.11a, channel 36 */ | |
129 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
130 | /* IEEE 802.11a, channel 40 */ | |
131 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
132 | /* IEEE 802.11a, channel 44 */ | |
133 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
134 | /* IEEE 802.11a, channels 48..64 */ | |
135 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
136 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
137 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
138 | } | |
139 | }; | |
140 | ||
141 | static const struct ieee80211_regdomain jp_regdom = { | |
142 | .n_reg_rules = 3, | |
143 | .alpha2 = "JP", | |
144 | .reg_rules = { | |
145 | /* IEEE 802.11b/g, channels 1..14 */ | |
146 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
147 | /* IEEE 802.11a, channels 34..48 */ | |
148 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
149 | NL80211_RRF_PASSIVE_SCAN), | |
150 | /* IEEE 802.11a, channels 52..64 */ | |
151 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
152 | NL80211_RRF_NO_IBSS | | |
153 | NL80211_RRF_DFS), | |
154 | } | |
155 | }; | |
156 | ||
157 | static const struct ieee80211_regdomain eu_regdom = { | |
158 | .n_reg_rules = 6, | |
159 | /* This alpha2 is bogus, we leave it here just for stupid | |
160 | * backward compatibility */ | |
161 | .alpha2 = "EU", | |
162 | .reg_rules = { | |
163 | /* IEEE 802.11b/g, channels 1..13 */ | |
164 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
165 | /* IEEE 802.11a, channel 36 */ | |
166 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
167 | NL80211_RRF_PASSIVE_SCAN), | |
168 | /* IEEE 802.11a, channel 40 */ | |
169 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
170 | NL80211_RRF_PASSIVE_SCAN), | |
171 | /* IEEE 802.11a, channel 44 */ | |
172 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
173 | NL80211_RRF_PASSIVE_SCAN), | |
174 | /* IEEE 802.11a, channels 48..64 */ | |
175 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
176 | NL80211_RRF_NO_IBSS | | |
177 | NL80211_RRF_DFS), | |
178 | /* IEEE 802.11a, channels 100..140 */ | |
179 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
180 | NL80211_RRF_NO_IBSS | | |
181 | NL80211_RRF_DFS), | |
182 | } | |
183 | }; | |
184 | ||
185 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
186 | { | |
187 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
188 | return &us_regdom; | |
189 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
190 | return &jp_regdom; | |
191 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
192 | return &eu_regdom; | |
193 | /* Default, as per the old rules */ | |
194 | return &us_regdom; | |
195 | } | |
196 | ||
a3d2eaf0 | 197 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
198 | { |
199 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
200 | return true; | |
201 | return false; | |
202 | } | |
942b25cf JB |
203 | #else |
204 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 205 | { |
942b25cf | 206 | return false; |
734366de | 207 | } |
942b25cf JB |
208 | #endif |
209 | ||
734366de JB |
210 | static void reset_regdomains(void) |
211 | { | |
942b25cf JB |
212 | /* avoid freeing static information or freeing something twice */ |
213 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
214 | cfg80211_regdomain = NULL; | |
215 | if (cfg80211_world_regdom == &world_regdom) | |
216 | cfg80211_world_regdom = NULL; | |
217 | if (cfg80211_regdomain == &world_regdom) | |
218 | cfg80211_regdomain = NULL; | |
219 | if (is_old_static_regdom(cfg80211_regdomain)) | |
220 | cfg80211_regdomain = NULL; | |
221 | ||
222 | kfree(cfg80211_regdomain); | |
223 | kfree(cfg80211_world_regdom); | |
734366de | 224 | |
a3d2eaf0 | 225 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
226 | cfg80211_regdomain = NULL; |
227 | } | |
228 | ||
229 | /* Dynamic world regulatory domain requested by the wireless | |
230 | * core upon initialization */ | |
a3d2eaf0 | 231 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 232 | { |
f6037d09 | 233 | BUG_ON(!last_request); |
734366de JB |
234 | |
235 | reset_regdomains(); | |
236 | ||
237 | cfg80211_world_regdom = rd; | |
238 | cfg80211_regdomain = rd; | |
239 | } | |
734366de | 240 | |
a3d2eaf0 | 241 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
242 | { |
243 | if (!alpha2) | |
244 | return false; | |
245 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
246 | return true; | |
247 | return false; | |
248 | } | |
8318d78a | 249 | |
a3d2eaf0 | 250 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
251 | { |
252 | if (!alpha2) | |
253 | return false; | |
254 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
255 | return true; | |
256 | return false; | |
257 | } | |
8318d78a | 258 | |
b2e1b302 LR |
259 | static bool is_alpha_upper(char letter) |
260 | { | |
261 | /* ASCII A - Z */ | |
262 | if (letter >= 65 && letter <= 90) | |
263 | return true; | |
264 | return false; | |
265 | } | |
8318d78a | 266 | |
a3d2eaf0 | 267 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
268 | { |
269 | if (!alpha2) | |
270 | return false; | |
271 | /* Special case where regulatory domain was built by driver | |
272 | * but a specific alpha2 cannot be determined */ | |
273 | if (alpha2[0] == '9' && alpha2[1] == '9') | |
274 | return true; | |
275 | return false; | |
276 | } | |
8318d78a | 277 | |
3f2355cb LR |
278 | static bool is_intersected_alpha2(const char *alpha2) |
279 | { | |
280 | if (!alpha2) | |
281 | return false; | |
282 | /* Special case where regulatory domain is the | |
283 | * result of an intersection between two regulatory domain | |
284 | * structures */ | |
285 | if (alpha2[0] == '9' && alpha2[1] == '8') | |
286 | return true; | |
287 | return false; | |
288 | } | |
289 | ||
a3d2eaf0 | 290 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
291 | { |
292 | if (!alpha2) | |
293 | return false; | |
294 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
295 | return true; | |
296 | return false; | |
297 | } | |
8318d78a | 298 | |
a3d2eaf0 | 299 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
300 | { |
301 | if (!alpha2_x || !alpha2_y) | |
302 | return false; | |
303 | if (alpha2_x[0] == alpha2_y[0] && | |
304 | alpha2_x[1] == alpha2_y[1]) | |
305 | return true; | |
306 | return false; | |
307 | } | |
308 | ||
a3d2eaf0 | 309 | static bool regdom_changed(const char *alpha2) |
b2e1b302 LR |
310 | { |
311 | if (!cfg80211_regdomain) | |
312 | return true; | |
313 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
314 | return false; | |
315 | return true; | |
316 | } | |
317 | ||
3f2355cb LR |
318 | /** |
319 | * country_ie_integrity_changes - tells us if the country IE has changed | |
320 | * @checksum: checksum of country IE of fields we are interested in | |
321 | * | |
322 | * If the country IE has not changed you can ignore it safely. This is | |
323 | * useful to determine if two devices are seeing two different country IEs | |
324 | * even on the same alpha2. Note that this will return false if no IE has | |
325 | * been set on the wireless core yet. | |
326 | */ | |
327 | static bool country_ie_integrity_changes(u32 checksum) | |
328 | { | |
329 | /* If no IE has been set then the checksum doesn't change */ | |
330 | if (unlikely(!last_request->country_ie_checksum)) | |
331 | return false; | |
332 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
333 | return true; | |
334 | return false; | |
335 | } | |
336 | ||
b2e1b302 LR |
337 | /* This lets us keep regulatory code which is updated on a regulatory |
338 | * basis in userspace. */ | |
339 | static int call_crda(const char *alpha2) | |
340 | { | |
341 | char country_env[9 + 2] = "COUNTRY="; | |
342 | char *envp[] = { | |
343 | country_env, | |
344 | NULL | |
345 | }; | |
346 | ||
347 | if (!is_world_regdom((char *) alpha2)) | |
348 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
349 | alpha2[0], alpha2[1]); | |
350 | else | |
b2e1b302 LR |
351 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
352 | "regulatory domain\n"); | |
b2e1b302 LR |
353 | |
354 | country_env[8] = alpha2[0]; | |
355 | country_env[9] = alpha2[1]; | |
356 | ||
357 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
358 | } | |
359 | ||
b2e1b302 | 360 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 361 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 362 | { |
f6037d09 JB |
363 | if (!last_request) |
364 | return false; | |
365 | ||
366 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 367 | } |
8318d78a | 368 | |
b2e1b302 | 369 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 370 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 371 | { |
a3d2eaf0 | 372 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
373 | u32 freq_diff; |
374 | ||
91e99004 | 375 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
376 | return false; |
377 | ||
378 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
379 | return false; | |
380 | ||
381 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
382 | ||
d71aaf60 | 383 | if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff) |
b2e1b302 LR |
384 | return false; |
385 | ||
386 | return true; | |
387 | } | |
388 | ||
a3d2eaf0 | 389 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 390 | { |
a3d2eaf0 | 391 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 392 | unsigned int i; |
8318d78a | 393 | |
b2e1b302 LR |
394 | if (!rd->n_reg_rules) |
395 | return false; | |
8318d78a | 396 | |
88dc1c3f LR |
397 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
398 | return false; | |
399 | ||
b2e1b302 LR |
400 | for (i = 0; i < rd->n_reg_rules; i++) { |
401 | reg_rule = &rd->reg_rules[i]; | |
402 | if (!is_valid_reg_rule(reg_rule)) | |
403 | return false; | |
404 | } | |
405 | ||
406 | return true; | |
8318d78a JB |
407 | } |
408 | ||
b2e1b302 LR |
409 | /* Returns value in KHz */ |
410 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
411 | u32 freq) | |
412 | { | |
413 | unsigned int i; | |
414 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
415 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
416 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
417 | if (start_freq_khz >= freq_range->start_freq_khz && | |
418 | end_freq_khz <= freq_range->end_freq_khz) | |
419 | return supported_bandwidths[i]; | |
420 | } | |
421 | return 0; | |
422 | } | |
8318d78a | 423 | |
0c7dc45d LR |
424 | /** |
425 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
426 | * @freq_range: frequency rule we want to query | |
427 | * @freq_khz: frequency we are inquiring about | |
428 | * | |
429 | * This lets us know if a specific frequency rule is or is not relevant to | |
430 | * a specific frequency's band. Bands are device specific and artificial | |
431 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
432 | * safe for now to assume that a frequency rule should not be part of a | |
433 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
434 | * This resolution can be lowered and should be considered as we add | |
435 | * regulatory rule support for other "bands". | |
436 | **/ | |
437 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
438 | u32 freq_khz) | |
439 | { | |
440 | #define ONE_GHZ_IN_KHZ 1000000 | |
441 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
442 | return true; | |
443 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
444 | return true; | |
445 | return false; | |
446 | #undef ONE_GHZ_IN_KHZ | |
447 | } | |
448 | ||
3f2355cb LR |
449 | /* Converts a country IE to a regulatory domain. A regulatory domain |
450 | * structure has a lot of information which the IE doesn't yet have, | |
451 | * so for the other values we use upper max values as we will intersect | |
452 | * with our userspace regulatory agent to get lower bounds. */ | |
453 | static struct ieee80211_regdomain *country_ie_2_rd( | |
454 | u8 *country_ie, | |
455 | u8 country_ie_len, | |
456 | u32 *checksum) | |
457 | { | |
458 | struct ieee80211_regdomain *rd = NULL; | |
459 | unsigned int i = 0; | |
460 | char alpha2[2]; | |
461 | u32 flags = 0; | |
462 | u32 num_rules = 0, size_of_regd = 0; | |
463 | u8 *triplets_start = NULL; | |
464 | u8 len_at_triplet = 0; | |
465 | /* the last channel we have registered in a subband (triplet) */ | |
466 | int last_sub_max_channel = 0; | |
467 | ||
468 | *checksum = 0xDEADBEEF; | |
469 | ||
470 | /* Country IE requirements */ | |
471 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
472 | country_ie_len & 0x01); | |
473 | ||
474 | alpha2[0] = country_ie[0]; | |
475 | alpha2[1] = country_ie[1]; | |
476 | ||
477 | /* | |
478 | * Third octet can be: | |
479 | * 'I' - Indoor | |
480 | * 'O' - Outdoor | |
481 | * | |
482 | * anything else we assume is no restrictions | |
483 | */ | |
484 | if (country_ie[2] == 'I') | |
485 | flags = NL80211_RRF_NO_OUTDOOR; | |
486 | else if (country_ie[2] == 'O') | |
487 | flags = NL80211_RRF_NO_INDOOR; | |
488 | ||
489 | country_ie += 3; | |
490 | country_ie_len -= 3; | |
491 | ||
492 | triplets_start = country_ie; | |
493 | len_at_triplet = country_ie_len; | |
494 | ||
495 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
496 | ||
497 | /* We need to build a reg rule for each triplet, but first we must | |
498 | * calculate the number of reg rules we will need. We will need one | |
499 | * for each channel subband */ | |
500 | while (country_ie_len >= 3) { | |
615aab4b | 501 | int end_channel = 0; |
3f2355cb LR |
502 | struct ieee80211_country_ie_triplet *triplet = |
503 | (struct ieee80211_country_ie_triplet *) country_ie; | |
504 | int cur_sub_max_channel = 0, cur_channel = 0; | |
505 | ||
506 | if (triplet->ext.reg_extension_id >= | |
507 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
508 | country_ie += 3; | |
509 | country_ie_len -= 3; | |
510 | continue; | |
511 | } | |
512 | ||
615aab4b LR |
513 | /* 2 GHz */ |
514 | if (triplet->chans.first_channel <= 14) | |
515 | end_channel = triplet->chans.first_channel + | |
516 | triplet->chans.num_channels; | |
517 | else | |
518 | /* | |
519 | * 5 GHz -- For example in country IEs if the first | |
520 | * channel given is 36 and the number of channels is 4 | |
521 | * then the individual channel numbers defined for the | |
522 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
523 | * and not 36, 37, 38, 39. | |
524 | * | |
525 | * See: http://tinyurl.com/11d-clarification | |
526 | */ | |
527 | end_channel = triplet->chans.first_channel + | |
528 | (4 * (triplet->chans.num_channels - 1)); | |
529 | ||
3f2355cb | 530 | cur_channel = triplet->chans.first_channel; |
615aab4b | 531 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
532 | |
533 | /* Basic sanity check */ | |
534 | if (cur_sub_max_channel < cur_channel) | |
535 | return NULL; | |
536 | ||
537 | /* Do not allow overlapping channels. Also channels | |
538 | * passed in each subband must be monotonically | |
539 | * increasing */ | |
540 | if (last_sub_max_channel) { | |
541 | if (cur_channel <= last_sub_max_channel) | |
542 | return NULL; | |
543 | if (cur_sub_max_channel <= last_sub_max_channel) | |
544 | return NULL; | |
545 | } | |
546 | ||
547 | /* When dot11RegulatoryClassesRequired is supported | |
548 | * we can throw ext triplets as part of this soup, | |
549 | * for now we don't care when those change as we | |
550 | * don't support them */ | |
551 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | | |
552 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
553 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
554 | ||
555 | last_sub_max_channel = cur_sub_max_channel; | |
556 | ||
557 | country_ie += 3; | |
558 | country_ie_len -= 3; | |
559 | num_rules++; | |
560 | ||
561 | /* Note: this is not a IEEE requirement but | |
562 | * simply a memory requirement */ | |
563 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) | |
564 | return NULL; | |
565 | } | |
566 | ||
567 | country_ie = triplets_start; | |
568 | country_ie_len = len_at_triplet; | |
569 | ||
570 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
571 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
572 | ||
573 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
574 | if (!rd) | |
575 | return NULL; | |
576 | ||
577 | rd->n_reg_rules = num_rules; | |
578 | rd->alpha2[0] = alpha2[0]; | |
579 | rd->alpha2[1] = alpha2[1]; | |
580 | ||
581 | /* This time around we fill in the rd */ | |
582 | while (country_ie_len >= 3) { | |
02e68a3d | 583 | int end_channel = 0; |
3f2355cb LR |
584 | struct ieee80211_country_ie_triplet *triplet = |
585 | (struct ieee80211_country_ie_triplet *) country_ie; | |
586 | struct ieee80211_reg_rule *reg_rule = NULL; | |
587 | struct ieee80211_freq_range *freq_range = NULL; | |
588 | struct ieee80211_power_rule *power_rule = NULL; | |
589 | ||
590 | /* Must parse if dot11RegulatoryClassesRequired is true, | |
591 | * we don't support this yet */ | |
592 | if (triplet->ext.reg_extension_id >= | |
593 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
594 | country_ie += 3; | |
595 | country_ie_len -= 3; | |
596 | continue; | |
597 | } | |
598 | ||
599 | reg_rule = &rd->reg_rules[i]; | |
600 | freq_range = ®_rule->freq_range; | |
601 | power_rule = ®_rule->power_rule; | |
602 | ||
603 | reg_rule->flags = flags; | |
604 | ||
02e68a3d LR |
605 | /* 2 GHz */ |
606 | if (triplet->chans.first_channel <= 14) | |
607 | end_channel = triplet->chans.first_channel + | |
608 | triplet->chans.num_channels; | |
609 | else | |
02e68a3d LR |
610 | end_channel = triplet->chans.first_channel + |
611 | (4 * (triplet->chans.num_channels - 1)); | |
612 | ||
3f2355cb LR |
613 | /* The +10 is since the regulatory domain expects |
614 | * the actual band edge, not the center of freq for | |
615 | * its start and end freqs, assuming 20 MHz bandwidth on | |
616 | * the channels passed */ | |
617 | freq_range->start_freq_khz = | |
618 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
619 | triplet->chans.first_channel) - 10); | |
620 | freq_range->end_freq_khz = | |
621 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 622 | end_channel) + 10); |
3f2355cb LR |
623 | |
624 | /* Large arbitrary values, we intersect later */ | |
625 | /* Increment this if we ever support >= 40 MHz channels | |
626 | * in IEEE 802.11 */ | |
627 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); | |
628 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
629 | power_rule->max_eirp = DBM_TO_MBM(100); | |
630 | ||
631 | country_ie += 3; | |
632 | country_ie_len -= 3; | |
633 | i++; | |
634 | ||
635 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
636 | } | |
637 | ||
638 | return rd; | |
639 | } | |
640 | ||
641 | ||
9c96477d LR |
642 | /* Helper for regdom_intersect(), this does the real |
643 | * mathematical intersection fun */ | |
644 | static int reg_rules_intersect( | |
645 | const struct ieee80211_reg_rule *rule1, | |
646 | const struct ieee80211_reg_rule *rule2, | |
647 | struct ieee80211_reg_rule *intersected_rule) | |
648 | { | |
649 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
650 | struct ieee80211_freq_range *freq_range; | |
651 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
652 | struct ieee80211_power_rule *power_rule; | |
653 | u32 freq_diff; | |
654 | ||
655 | freq_range1 = &rule1->freq_range; | |
656 | freq_range2 = &rule2->freq_range; | |
657 | freq_range = &intersected_rule->freq_range; | |
658 | ||
659 | power_rule1 = &rule1->power_rule; | |
660 | power_rule2 = &rule2->power_rule; | |
661 | power_rule = &intersected_rule->power_rule; | |
662 | ||
663 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
664 | freq_range2->start_freq_khz); | |
665 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
666 | freq_range2->end_freq_khz); | |
667 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
668 | freq_range2->max_bandwidth_khz); | |
669 | ||
670 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
671 | if (freq_range->max_bandwidth_khz > freq_diff) | |
672 | freq_range->max_bandwidth_khz = freq_diff; | |
673 | ||
674 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
675 | power_rule2->max_eirp); | |
676 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
677 | power_rule2->max_antenna_gain); | |
678 | ||
679 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
680 | ||
681 | if (!is_valid_reg_rule(intersected_rule)) | |
682 | return -EINVAL; | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
687 | /** | |
688 | * regdom_intersect - do the intersection between two regulatory domains | |
689 | * @rd1: first regulatory domain | |
690 | * @rd2: second regulatory domain | |
691 | * | |
692 | * Use this function to get the intersection between two regulatory domains. | |
693 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
694 | * as no one single alpha2 can represent this regulatory domain. | |
695 | * | |
696 | * Returns a pointer to the regulatory domain structure which will hold the | |
697 | * resulting intersection of rules between rd1 and rd2. We will | |
698 | * kzalloc() this structure for you. | |
699 | */ | |
700 | static struct ieee80211_regdomain *regdom_intersect( | |
701 | const struct ieee80211_regdomain *rd1, | |
702 | const struct ieee80211_regdomain *rd2) | |
703 | { | |
704 | int r, size_of_regd; | |
705 | unsigned int x, y; | |
706 | unsigned int num_rules = 0, rule_idx = 0; | |
707 | const struct ieee80211_reg_rule *rule1, *rule2; | |
708 | struct ieee80211_reg_rule *intersected_rule; | |
709 | struct ieee80211_regdomain *rd; | |
710 | /* This is just a dummy holder to help us count */ | |
711 | struct ieee80211_reg_rule irule; | |
712 | ||
713 | /* Uses the stack temporarily for counter arithmetic */ | |
714 | intersected_rule = &irule; | |
715 | ||
716 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
717 | ||
718 | if (!rd1 || !rd2) | |
719 | return NULL; | |
720 | ||
721 | /* First we get a count of the rules we'll need, then we actually | |
722 | * build them. This is to so we can malloc() and free() a | |
723 | * regdomain once. The reason we use reg_rules_intersect() here | |
724 | * is it will return -EINVAL if the rule computed makes no sense. | |
725 | * All rules that do check out OK are valid. */ | |
726 | ||
727 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
728 | rule1 = &rd1->reg_rules[x]; | |
729 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
730 | rule2 = &rd2->reg_rules[y]; | |
731 | if (!reg_rules_intersect(rule1, rule2, | |
732 | intersected_rule)) | |
733 | num_rules++; | |
734 | memset(intersected_rule, 0, | |
735 | sizeof(struct ieee80211_reg_rule)); | |
736 | } | |
737 | } | |
738 | ||
739 | if (!num_rules) | |
740 | return NULL; | |
741 | ||
742 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
743 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
744 | ||
745 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
746 | if (!rd) | |
747 | return NULL; | |
748 | ||
749 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
750 | rule1 = &rd1->reg_rules[x]; | |
751 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
752 | rule2 = &rd2->reg_rules[y]; | |
753 | /* This time around instead of using the stack lets | |
754 | * write to the target rule directly saving ourselves | |
755 | * a memcpy() */ | |
756 | intersected_rule = &rd->reg_rules[rule_idx]; | |
757 | r = reg_rules_intersect(rule1, rule2, | |
758 | intersected_rule); | |
759 | /* No need to memset here the intersected rule here as | |
760 | * we're not using the stack anymore */ | |
761 | if (r) | |
762 | continue; | |
763 | rule_idx++; | |
764 | } | |
765 | } | |
766 | ||
767 | if (rule_idx != num_rules) { | |
768 | kfree(rd); | |
769 | return NULL; | |
770 | } | |
771 | ||
772 | rd->n_reg_rules = num_rules; | |
773 | rd->alpha2[0] = '9'; | |
774 | rd->alpha2[1] = '8'; | |
775 | ||
776 | return rd; | |
777 | } | |
778 | ||
b2e1b302 LR |
779 | /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may |
780 | * want to just have the channel structure use these */ | |
781 | static u32 map_regdom_flags(u32 rd_flags) | |
782 | { | |
783 | u32 channel_flags = 0; | |
784 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
785 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
786 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
787 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
788 | if (rd_flags & NL80211_RRF_DFS) | |
789 | channel_flags |= IEEE80211_CHAN_RADAR; | |
790 | return channel_flags; | |
791 | } | |
792 | ||
793 | /** | |
794 | * freq_reg_info - get regulatory information for the given frequency | |
795 | * @center_freq: Frequency in KHz for which we want regulatory information for | |
796 | * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one | |
797 | * you can set this to 0. If this frequency is allowed we then set | |
798 | * this value to the maximum allowed bandwidth. | |
799 | * @reg_rule: the regulatory rule which we have for this frequency | |
800 | * | |
0c7dc45d LR |
801 | * Use this function to get the regulatory rule for a specific frequency on |
802 | * a given wireless device. If the device has a specific regulatory domain | |
803 | * it wants to follow we respect that unless a country IE has been received | |
804 | * and processed already. | |
805 | * | |
806 | * Returns 0 if it was able to find a valid regulatory rule which does | |
807 | * apply to the given center_freq otherwise it returns non-zero. It will | |
808 | * also return -ERANGE if we determine the given center_freq does not even have | |
809 | * a regulatory rule for a frequency range in the center_freq's band. See | |
810 | * freq_in_rule_band() for our current definition of a band -- this is purely | |
811 | * subjective and right now its 802.11 specific. | |
b2e1b302 LR |
812 | */ |
813 | static int freq_reg_info(u32 center_freq, u32 *bandwidth, | |
814 | const struct ieee80211_reg_rule **reg_rule) | |
8318d78a JB |
815 | { |
816 | int i; | |
0c7dc45d | 817 | bool band_rule_found = false; |
b2e1b302 | 818 | u32 max_bandwidth = 0; |
8318d78a | 819 | |
b2e1b302 LR |
820 | if (!cfg80211_regdomain) |
821 | return -EINVAL; | |
822 | ||
823 | for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) { | |
824 | const struct ieee80211_reg_rule *rr; | |
825 | const struct ieee80211_freq_range *fr = NULL; | |
826 | const struct ieee80211_power_rule *pr = NULL; | |
827 | ||
828 | rr = &cfg80211_regdomain->reg_rules[i]; | |
829 | fr = &rr->freq_range; | |
830 | pr = &rr->power_rule; | |
0c7dc45d LR |
831 | |
832 | /* We only need to know if one frequency rule was | |
833 | * was in center_freq's band, that's enough, so lets | |
834 | * not overwrite it once found */ | |
835 | if (!band_rule_found) | |
836 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
837 | ||
b2e1b302 | 838 | max_bandwidth = freq_max_bandwidth(fr, center_freq); |
0c7dc45d | 839 | |
b2e1b302 LR |
840 | if (max_bandwidth && *bandwidth <= max_bandwidth) { |
841 | *reg_rule = rr; | |
842 | *bandwidth = max_bandwidth; | |
8318d78a JB |
843 | break; |
844 | } | |
845 | } | |
846 | ||
0c7dc45d LR |
847 | if (!band_rule_found) |
848 | return -ERANGE; | |
849 | ||
b2e1b302 LR |
850 | return !max_bandwidth; |
851 | } | |
852 | ||
a92a3ce7 LR |
853 | static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, |
854 | unsigned int chan_idx) | |
b2e1b302 LR |
855 | { |
856 | int r; | |
a92a3ce7 | 857 | u32 flags; |
b2e1b302 LR |
858 | u32 max_bandwidth = 0; |
859 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
860 | const struct ieee80211_power_rule *power_rule = NULL; | |
a92a3ce7 LR |
861 | struct ieee80211_supported_band *sband; |
862 | struct ieee80211_channel *chan; | |
863 | ||
864 | sband = wiphy->bands[band]; | |
865 | BUG_ON(chan_idx >= sband->n_channels); | |
866 | chan = &sband->channels[chan_idx]; | |
867 | ||
868 | flags = chan->orig_flags; | |
b2e1b302 LR |
869 | |
870 | r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq), | |
871 | &max_bandwidth, ®_rule); | |
872 | ||
873 | if (r) { | |
0c7dc45d LR |
874 | /* This means no regulatory rule was found in the country IE |
875 | * with a frequency range on the center_freq's band, since | |
876 | * IEEE-802.11 allows for a country IE to have a subset of the | |
877 | * regulatory information provided in a country we ignore | |
878 | * disabling the channel unless at least one reg rule was | |
879 | * found on the center_freq's band. For details see this | |
880 | * clarification: | |
881 | * | |
882 | * http://tinyurl.com/11d-clarification | |
883 | */ | |
884 | if (r == -ERANGE && | |
885 | last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
886 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
887 | printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " | |
888 | "intact on %s - no rule found in band on " | |
889 | "Country IE\n", | |
890 | chan->center_freq, wiphy_name(wiphy)); | |
891 | #endif | |
892 | } else { | |
893 | /* In this case we know the country IE has at least one reg rule | |
894 | * for the band so we respect its band definitions */ | |
895 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
896 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
897 | printk(KERN_DEBUG "cfg80211: Disabling " | |
898 | "channel %d MHz on %s due to " | |
899 | "Country IE\n", | |
900 | chan->center_freq, wiphy_name(wiphy)); | |
901 | #endif | |
902 | flags |= IEEE80211_CHAN_DISABLED; | |
903 | chan->flags = flags; | |
904 | } | |
8318d78a JB |
905 | return; |
906 | } | |
907 | ||
b2e1b302 LR |
908 | power_rule = ®_rule->power_rule; |
909 | ||
910 | chan->flags = flags | map_regdom_flags(reg_rule->flags); | |
8318d78a | 911 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
912 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
913 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 914 | if (chan->orig_mpwr) |
b2e1b302 LR |
915 | chan->max_power = min(chan->orig_mpwr, |
916 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 917 | else |
b2e1b302 | 918 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
919 | } |
920 | ||
a92a3ce7 | 921 | static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) |
8318d78a | 922 | { |
a92a3ce7 LR |
923 | unsigned int i; |
924 | struct ieee80211_supported_band *sband; | |
925 | ||
926 | BUG_ON(!wiphy->bands[band]); | |
927 | sband = wiphy->bands[band]; | |
8318d78a JB |
928 | |
929 | for (i = 0; i < sband->n_channels; i++) | |
a92a3ce7 | 930 | handle_channel(wiphy, band, i); |
8318d78a JB |
931 | } |
932 | ||
14b9815a LR |
933 | static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby) |
934 | { | |
935 | if (!last_request) | |
936 | return true; | |
937 | if (setby == REGDOM_SET_BY_CORE && | |
938 | wiphy->fw_handles_regulatory) | |
939 | return true; | |
940 | return false; | |
941 | } | |
942 | ||
b2e1b302 | 943 | static void update_all_wiphy_regulatory(enum reg_set_by setby) |
8318d78a | 944 | { |
b2e1b302 | 945 | struct cfg80211_registered_device *drv; |
8318d78a | 946 | |
b2e1b302 | 947 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
14b9815a LR |
948 | if (!ignore_reg_update(&drv->wiphy, setby)) |
949 | wiphy_update_regulatory(&drv->wiphy, setby); | |
b2e1b302 LR |
950 | } |
951 | ||
952 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
953 | { | |
954 | enum ieee80211_band band; | |
955 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
8318d78a | 956 | if (wiphy->bands[band]) |
a92a3ce7 | 957 | handle_band(wiphy, band); |
b2e1b302 LR |
958 | if (wiphy->reg_notifier) |
959 | wiphy->reg_notifier(wiphy, setby); | |
960 | } | |
961 | } | |
962 | ||
9c96477d LR |
963 | /* Return value which can be used by ignore_request() to indicate |
964 | * it has been determined we should intersect two regulatory domains */ | |
965 | #define REG_INTERSECT 1 | |
966 | ||
84fa4f43 JB |
967 | /* This has the logic which determines when a new request |
968 | * should be ignored. */ | |
969 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
970 | const char *alpha2) | |
971 | { | |
972 | /* All initial requests are respected */ | |
973 | if (!last_request) | |
974 | return 0; | |
975 | ||
976 | switch (set_by) { | |
977 | case REGDOM_SET_BY_INIT: | |
978 | return -EINVAL; | |
979 | case REGDOM_SET_BY_CORE: | |
980 | /* | |
981 | * Always respect new wireless core hints, should only happen | |
982 | * when updating the world regulatory domain at init. | |
983 | */ | |
984 | return 0; | |
985 | case REGDOM_SET_BY_COUNTRY_IE: | |
986 | if (unlikely(!is_an_alpha2(alpha2))) | |
987 | return -EINVAL; | |
988 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
989 | if (last_request->wiphy != wiphy) { | |
990 | /* | |
991 | * Two cards with two APs claiming different | |
992 | * different Country IE alpha2s. We could | |
993 | * intersect them, but that seems unlikely | |
994 | * to be correct. Reject second one for now. | |
995 | */ | |
996 | if (!alpha2_equal(alpha2, | |
997 | cfg80211_regdomain->alpha2)) | |
998 | return -EOPNOTSUPP; | |
999 | return -EALREADY; | |
1000 | } | |
3f2355cb LR |
1001 | /* Two consecutive Country IE hints on the same wiphy. |
1002 | * This should be picked up early by the driver/stack */ | |
1003 | if (WARN_ON(!alpha2_equal(cfg80211_regdomain->alpha2, | |
1004 | alpha2))) | |
84fa4f43 JB |
1005 | return 0; |
1006 | return -EALREADY; | |
1007 | } | |
3f2355cb | 1008 | return REG_INTERSECT; |
84fa4f43 JB |
1009 | case REGDOM_SET_BY_DRIVER: |
1010 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) | |
1011 | return -EALREADY; | |
1012 | return 0; | |
1013 | case REGDOM_SET_BY_USER: | |
84fa4f43 | 1014 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) |
9c96477d | 1015 | return REG_INTERSECT; |
3f2355cb LR |
1016 | /* If the user knows better the user should set the regdom |
1017 | * to their country before the IE is picked up */ | |
1018 | if (last_request->initiator == REGDOM_SET_BY_USER && | |
1019 | last_request->intersect) | |
1020 | return -EOPNOTSUPP; | |
84fa4f43 JB |
1021 | return 0; |
1022 | } | |
1023 | ||
1024 | return -EINVAL; | |
1025 | } | |
1026 | ||
b2e1b302 LR |
1027 | /* Caller must hold &cfg80211_drv_mutex */ |
1028 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, | |
3f2355cb LR |
1029 | const char *alpha2, |
1030 | u32 country_ie_checksum, | |
1031 | enum environment_cap env) | |
b2e1b302 LR |
1032 | { |
1033 | struct regulatory_request *request; | |
9c96477d | 1034 | bool intersect = false; |
b2e1b302 LR |
1035 | int r = 0; |
1036 | ||
be3d4810 | 1037 | r = ignore_request(wiphy, set_by, alpha2); |
9c96477d LR |
1038 | |
1039 | if (r == REG_INTERSECT) | |
1040 | intersect = true; | |
1041 | else if (r) | |
b2e1b302 LR |
1042 | return r; |
1043 | ||
5203cdb6 LR |
1044 | request = kzalloc(sizeof(struct regulatory_request), |
1045 | GFP_KERNEL); | |
1046 | if (!request) | |
1047 | return -ENOMEM; | |
1048 | ||
1049 | request->alpha2[0] = alpha2[0]; | |
1050 | request->alpha2[1] = alpha2[1]; | |
1051 | request->initiator = set_by; | |
1052 | request->wiphy = wiphy; | |
1053 | request->intersect = intersect; | |
3f2355cb LR |
1054 | request->country_ie_checksum = country_ie_checksum; |
1055 | request->country_ie_env = env; | |
5203cdb6 LR |
1056 | |
1057 | kfree(last_request); | |
1058 | last_request = request; | |
3f2355cb LR |
1059 | /* |
1060 | * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled | |
1061 | * AND if CRDA is NOT present nothing will happen, if someone | |
1062 | * wants to bother with 11d with OLD_REG you can add a timer. | |
1063 | * If after x amount of time nothing happens you can call: | |
1064 | * | |
1065 | * return set_regdom(country_ie_regdomain); | |
1066 | * | |
1067 | * to intersect with the static rd | |
1068 | */ | |
02ba0b32 | 1069 | return call_crda(alpha2); |
b2e1b302 LR |
1070 | } |
1071 | ||
be3d4810 | 1072 | void regulatory_hint(struct wiphy *wiphy, const char *alpha2) |
b2e1b302 | 1073 | { |
be3d4810 | 1074 | BUG_ON(!alpha2); |
b2e1b302 LR |
1075 | |
1076 | mutex_lock(&cfg80211_drv_mutex); | |
3f2355cb | 1077 | __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, 0, ENVIRON_ANY); |
b2e1b302 | 1078 | mutex_unlock(&cfg80211_drv_mutex); |
b2e1b302 LR |
1079 | } |
1080 | EXPORT_SYMBOL(regulatory_hint); | |
1081 | ||
3f2355cb LR |
1082 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, |
1083 | u32 country_ie_checksum) | |
1084 | { | |
1085 | if (!last_request->wiphy) | |
1086 | return false; | |
1087 | if (likely(last_request->wiphy != wiphy)) | |
1088 | return !country_ie_integrity_changes(country_ie_checksum); | |
1089 | /* We should not have let these through at this point, they | |
1090 | * should have been picked up earlier by the first alpha2 check | |
1091 | * on the device */ | |
1092 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) | |
1093 | return true; | |
1094 | return false; | |
1095 | } | |
1096 | ||
1097 | void regulatory_hint_11d(struct wiphy *wiphy, | |
1098 | u8 *country_ie, | |
1099 | u8 country_ie_len) | |
1100 | { | |
1101 | struct ieee80211_regdomain *rd = NULL; | |
1102 | char alpha2[2]; | |
1103 | u32 checksum = 0; | |
1104 | enum environment_cap env = ENVIRON_ANY; | |
1105 | ||
0f70f398 JB |
1106 | if (!last_request) |
1107 | return; | |
1108 | ||
3f2355cb LR |
1109 | mutex_lock(&cfg80211_drv_mutex); |
1110 | ||
1111 | /* IE len must be evenly divisible by 2 */ | |
1112 | if (country_ie_len & 0x01) | |
1113 | goto out; | |
1114 | ||
1115 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1116 | goto out; | |
1117 | ||
1118 | /* Pending country IE processing, this can happen after we | |
1119 | * call CRDA and wait for a response if a beacon was received before | |
1120 | * we were able to process the last regulatory_hint_11d() call */ | |
1121 | if (country_ie_regdomain) | |
1122 | goto out; | |
1123 | ||
1124 | alpha2[0] = country_ie[0]; | |
1125 | alpha2[1] = country_ie[1]; | |
1126 | ||
1127 | if (country_ie[2] == 'I') | |
1128 | env = ENVIRON_INDOOR; | |
1129 | else if (country_ie[2] == 'O') | |
1130 | env = ENVIRON_OUTDOOR; | |
1131 | ||
1132 | /* We will run this for *every* beacon processed for the BSSID, so | |
1133 | * we optimize an early check to exit out early if we don't have to | |
1134 | * do anything */ | |
1135 | if (likely(last_request->wiphy)) { | |
1136 | struct cfg80211_registered_device *drv_last_ie; | |
1137 | ||
1138 | drv_last_ie = wiphy_to_dev(last_request->wiphy); | |
1139 | ||
1140 | /* Lets keep this simple -- we trust the first AP | |
1141 | * after we intersect with CRDA */ | |
1142 | if (likely(last_request->wiphy == wiphy)) { | |
1143 | /* Ignore IEs coming in on this wiphy with | |
1144 | * the same alpha2 and environment cap */ | |
1145 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, | |
1146 | alpha2) && | |
1147 | env == drv_last_ie->env)) { | |
1148 | goto out; | |
1149 | } | |
1150 | /* the wiphy moved on to another BSSID or the AP | |
1151 | * was reconfigured. XXX: We need to deal with the | |
1152 | * case where the user suspends and goes to goes | |
1153 | * to another country, and then gets IEs from an | |
1154 | * AP with different settings */ | |
1155 | goto out; | |
1156 | } else { | |
1157 | /* Ignore IEs coming in on two separate wiphys with | |
1158 | * the same alpha2 and environment cap */ | |
1159 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, | |
1160 | alpha2) && | |
1161 | env == drv_last_ie->env)) { | |
1162 | goto out; | |
1163 | } | |
1164 | /* We could potentially intersect though */ | |
1165 | goto out; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); | |
1170 | if (!rd) | |
1171 | goto out; | |
1172 | ||
1173 | /* This will not happen right now but we leave it here for the | |
1174 | * the future when we want to add suspend/resume support and having | |
1175 | * the user move to another country after doing so, or having the user | |
1176 | * move to another AP. Right now we just trust the first AP. This is why | |
1177 | * this is marked as likley(). If we hit this before we add this support | |
1178 | * we want to be informed of it as it would indicate a mistake in the | |
1179 | * current design */ | |
1180 | if (likely(WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))) | |
1181 | goto out; | |
1182 | ||
1183 | /* We keep this around for when CRDA comes back with a response so | |
1184 | * we can intersect with that */ | |
1185 | country_ie_regdomain = rd; | |
1186 | ||
1187 | __regulatory_hint(wiphy, REGDOM_SET_BY_COUNTRY_IE, | |
1188 | country_ie_regdomain->alpha2, checksum, env); | |
1189 | ||
1190 | out: | |
1191 | mutex_unlock(&cfg80211_drv_mutex); | |
1192 | } | |
1193 | EXPORT_SYMBOL(regulatory_hint_11d); | |
b2e1b302 | 1194 | |
a3d2eaf0 | 1195 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1196 | { |
1197 | unsigned int i; | |
a3d2eaf0 JB |
1198 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1199 | const struct ieee80211_freq_range *freq_range = NULL; | |
1200 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
1201 | |
1202 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
1203 | "(max_antenna_gain, max_eirp)\n"); | |
1204 | ||
1205 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1206 | reg_rule = &rd->reg_rules[i]; | |
1207 | freq_range = ®_rule->freq_range; | |
1208 | power_rule = ®_rule->power_rule; | |
1209 | ||
1210 | /* There may not be documentation for max antenna gain | |
1211 | * in certain regions */ | |
1212 | if (power_rule->max_antenna_gain) | |
1213 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1214 | "(%d mBi, %d mBm)\n", | |
1215 | freq_range->start_freq_khz, | |
1216 | freq_range->end_freq_khz, | |
1217 | freq_range->max_bandwidth_khz, | |
1218 | power_rule->max_antenna_gain, | |
1219 | power_rule->max_eirp); | |
1220 | else | |
1221 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1222 | "(N/A, %d mBm)\n", | |
1223 | freq_range->start_freq_khz, | |
1224 | freq_range->end_freq_khz, | |
1225 | freq_range->max_bandwidth_khz, | |
1226 | power_rule->max_eirp); | |
1227 | } | |
1228 | } | |
1229 | ||
a3d2eaf0 | 1230 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1231 | { |
1232 | ||
3f2355cb LR |
1233 | if (is_intersected_alpha2(rd->alpha2)) { |
1234 | struct wiphy *wiphy = NULL; | |
1235 | struct cfg80211_registered_device *drv; | |
1236 | ||
1237 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
1238 | if (last_request->wiphy) { | |
1239 | wiphy = last_request->wiphy; | |
1240 | drv = wiphy_to_dev(wiphy); | |
1241 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1242 | "domain updated by AP to: %c%c\n", | |
1243 | drv->country_ie_alpha2[0], | |
1244 | drv->country_ie_alpha2[1]); | |
1245 | } else | |
1246 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1247 | "domain intersected: \n"); | |
1248 | } else | |
1249 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1250 | "intersected: \n"); | |
1251 | } else if (is_world_regdom(rd->alpha2)) | |
b2e1b302 LR |
1252 | printk(KERN_INFO "cfg80211: World regulatory " |
1253 | "domain updated:\n"); | |
1254 | else { | |
1255 | if (is_unknown_alpha2(rd->alpha2)) | |
1256 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1257 | "changed to driver built-in settings " | |
1258 | "(unknown country)\n"); | |
1259 | else | |
1260 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1261 | "changed to country: %c%c\n", | |
1262 | rd->alpha2[0], rd->alpha2[1]); | |
1263 | } | |
1264 | print_rd_rules(rd); | |
1265 | } | |
1266 | ||
2df78167 | 1267 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1268 | { |
1269 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1270 | rd->alpha2[0], rd->alpha2[1]); | |
1271 | print_rd_rules(rd); | |
1272 | } | |
1273 | ||
3f2355cb LR |
1274 | #ifdef CONFIG_CFG80211_REG_DEBUG |
1275 | static void reg_country_ie_process_debug( | |
1276 | const struct ieee80211_regdomain *rd, | |
1277 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1278 | const struct ieee80211_regdomain *intersected_rd) | |
1279 | { | |
1280 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
1281 | print_regdomain_info(country_ie_regdomain); | |
1282 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
1283 | print_regdomain_info(rd); | |
1284 | if (intersected_rd) { | |
1285 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
1286 | "and get:\n"); | |
1287 | print_regdomain_info(rd); | |
1288 | return; | |
1289 | } | |
1290 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
1291 | } | |
1292 | #else | |
1293 | static inline void reg_country_ie_process_debug( | |
1294 | const struct ieee80211_regdomain *rd, | |
1295 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1296 | const struct ieee80211_regdomain *intersected_rd) | |
1297 | { | |
1298 | } | |
1299 | #endif | |
1300 | ||
d2372b31 | 1301 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1302 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1303 | { |
9c96477d | 1304 | const struct ieee80211_regdomain *intersected_rd = NULL; |
3f2355cb LR |
1305 | struct cfg80211_registered_device *drv = NULL; |
1306 | struct wiphy *wiphy = NULL; | |
b2e1b302 LR |
1307 | /* Some basic sanity checks first */ |
1308 | ||
b2e1b302 | 1309 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1310 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1311 | return -EINVAL; |
1312 | update_world_regdomain(rd); | |
1313 | return 0; | |
1314 | } | |
b2e1b302 LR |
1315 | |
1316 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1317 | !is_unknown_alpha2(rd->alpha2)) | |
1318 | return -EINVAL; | |
1319 | ||
f6037d09 | 1320 | if (!last_request) |
b2e1b302 LR |
1321 | return -EINVAL; |
1322 | ||
3f2355cb LR |
1323 | /* Lets only bother proceeding on the same alpha2 if the current |
1324 | * rd is non static (it means CRDA was present and was used last) | |
1325 | * and the pending request came in from a country IE */ | |
1326 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
1327 | /* If someone else asked us to change the rd lets only bother | |
1328 | * checking if the alpha2 changes if CRDA was already called */ | |
1329 | if (!is_old_static_regdom(cfg80211_regdomain) && | |
1330 | !regdom_changed(rd->alpha2)) | |
1331 | return -EINVAL; | |
1332 | } | |
1333 | ||
1334 | wiphy = last_request->wiphy; | |
b2e1b302 LR |
1335 | |
1336 | /* Now lets set the regulatory domain, update all driver channels | |
1337 | * and finally inform them of what we have done, in case they want | |
1338 | * to review or adjust their own settings based on their own | |
1339 | * internal EEPROM data */ | |
1340 | ||
f6037d09 | 1341 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1342 | return -EINVAL; |
1343 | ||
8375af3b LR |
1344 | if (!is_valid_rd(rd)) { |
1345 | printk(KERN_ERR "cfg80211: Invalid " | |
1346 | "regulatory domain detected:\n"); | |
1347 | print_regdomain_info(rd); | |
1348 | return -EINVAL; | |
b2e1b302 LR |
1349 | } |
1350 | ||
b8295acd LR |
1351 | if (!last_request->intersect) { |
1352 | reset_regdomains(); | |
1353 | cfg80211_regdomain = rd; | |
1354 | return 0; | |
1355 | } | |
1356 | ||
1357 | /* Intersection requires a bit more work */ | |
1358 | ||
1359 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
1360 | ||
9c96477d LR |
1361 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
1362 | if (!intersected_rd) | |
1363 | return -EINVAL; | |
b8295acd LR |
1364 | |
1365 | /* We can trash what CRDA provided now */ | |
9c96477d | 1366 | kfree(rd); |
b8295acd LR |
1367 | rd = NULL; |
1368 | ||
1369 | reset_regdomains(); | |
1370 | cfg80211_regdomain = intersected_rd; | |
1371 | ||
1372 | return 0; | |
9c96477d LR |
1373 | } |
1374 | ||
3f2355cb LR |
1375 | /* |
1376 | * Country IE requests are handled a bit differently, we intersect | |
1377 | * the country IE rd with what CRDA believes that country should have | |
1378 | */ | |
1379 | ||
1380 | BUG_ON(!country_ie_regdomain); | |
1381 | ||
1382 | if (rd != country_ie_regdomain) { | |
1383 | /* Intersect what CRDA returned and our what we | |
1384 | * had built from the Country IE received */ | |
1385 | ||
1386 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); | |
1387 | ||
1388 | reg_country_ie_process_debug(rd, country_ie_regdomain, | |
1389 | intersected_rd); | |
1390 | ||
1391 | kfree(country_ie_regdomain); | |
1392 | country_ie_regdomain = NULL; | |
1393 | } else { | |
1394 | /* This would happen when CRDA was not present and | |
1395 | * OLD_REGULATORY was enabled. We intersect our Country | |
1396 | * IE rd and what was set on cfg80211 originally */ | |
1397 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); | |
1398 | } | |
1399 | ||
1400 | if (!intersected_rd) | |
1401 | return -EINVAL; | |
1402 | ||
1403 | drv = wiphy_to_dev(wiphy); | |
1404 | ||
1405 | drv->country_ie_alpha2[0] = rd->alpha2[0]; | |
1406 | drv->country_ie_alpha2[1] = rd->alpha2[1]; | |
1407 | drv->env = last_request->country_ie_env; | |
1408 | ||
1409 | BUG_ON(intersected_rd == rd); | |
1410 | ||
1411 | kfree(rd); | |
1412 | rd = NULL; | |
1413 | ||
b8295acd | 1414 | reset_regdomains(); |
3f2355cb | 1415 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
1416 | |
1417 | return 0; | |
1418 | } | |
1419 | ||
1420 | ||
1421 | /* Use this call to set the current regulatory domain. Conflicts with | |
1422 | * multiple drivers can be ironed out later. Caller must've already | |
d2372b31 | 1423 | * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */ |
a3d2eaf0 | 1424 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1425 | { |
b2e1b302 LR |
1426 | int r; |
1427 | ||
b2e1b302 LR |
1428 | /* Note that this doesn't update the wiphys, this is done below */ |
1429 | r = __set_regdom(rd); | |
d2372b31 JB |
1430 | if (r) { |
1431 | kfree(rd); | |
b2e1b302 | 1432 | return r; |
d2372b31 | 1433 | } |
b2e1b302 | 1434 | |
b2e1b302 | 1435 | /* This would make this whole thing pointless */ |
a01ddafd LR |
1436 | if (!last_request->intersect) |
1437 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
1438 | |
1439 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 1440 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 1441 | |
a01ddafd | 1442 | print_regdomain(cfg80211_regdomain); |
b2e1b302 LR |
1443 | |
1444 | return r; | |
1445 | } | |
1446 | ||
3f2355cb LR |
1447 | /* Caller must hold cfg80211_drv_mutex */ |
1448 | void reg_device_remove(struct wiphy *wiphy) | |
1449 | { | |
4a4f4d80 | 1450 | if (!last_request || !last_request->wiphy) |
3f2355cb LR |
1451 | return; |
1452 | if (last_request->wiphy != wiphy) | |
1453 | return; | |
1454 | last_request->wiphy = NULL; | |
1455 | last_request->country_ie_env = ENVIRON_ANY; | |
1456 | } | |
1457 | ||
b2e1b302 LR |
1458 | int regulatory_init(void) |
1459 | { | |
734366de JB |
1460 | int err; |
1461 | ||
b2e1b302 LR |
1462 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
1463 | if (IS_ERR(reg_pdev)) | |
1464 | return PTR_ERR(reg_pdev); | |
734366de JB |
1465 | |
1466 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
a3d2eaf0 | 1467 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 1468 | |
942b25cf | 1469 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de JB |
1470 | print_regdomain_info(cfg80211_regdomain); |
1471 | /* The old code still requests for a new regdomain and if | |
1472 | * you have CRDA you get it updated, otherwise you get | |
1473 | * stuck with the static values. We ignore "EU" code as | |
1474 | * that is not a valid ISO / IEC 3166 alpha2 */ | |
ac9440a4 | 1475 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') |
734366de | 1476 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, |
3f2355cb | 1477 | ieee80211_regdom, 0, ENVIRON_ANY); |
734366de | 1478 | #else |
a3d2eaf0 | 1479 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 1480 | |
3f2355cb | 1481 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00", 0, ENVIRON_ANY); |
734366de JB |
1482 | if (err) |
1483 | printk(KERN_ERR "cfg80211: calling CRDA failed - " | |
1484 | "unable to update world regulatory domain, " | |
1485 | "using static definition\n"); | |
1486 | #endif | |
1487 | ||
b2e1b302 LR |
1488 | return 0; |
1489 | } | |
1490 | ||
1491 | void regulatory_exit(void) | |
1492 | { | |
b2e1b302 | 1493 | mutex_lock(&cfg80211_drv_mutex); |
734366de | 1494 | |
b2e1b302 | 1495 | reset_regdomains(); |
734366de | 1496 | |
3f2355cb LR |
1497 | kfree(country_ie_regdomain); |
1498 | country_ie_regdomain = NULL; | |
1499 | ||
f6037d09 JB |
1500 | kfree(last_request); |
1501 | ||
b2e1b302 | 1502 | platform_device_unregister(reg_pdev); |
734366de | 1503 | |
b2e1b302 | 1504 | mutex_unlock(&cfg80211_drv_mutex); |
8318d78a | 1505 | } |