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 | ||
734366de JB |
57 | /* Central wireless core regulatory domains, we only need two, |
58 | * the current one and a world regulatory domain in case we have no | |
59 | * information to give us an alpha2 */ | |
f130347c | 60 | const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de | 61 | |
3f2355cb LR |
62 | /* We use this as a place for the rd structure built from the |
63 | * last parsed country IE to rest until CRDA gets back to us with | |
64 | * what it thinks should apply for the same country */ | |
65 | static const struct ieee80211_regdomain *country_ie_regdomain; | |
66 | ||
734366de JB |
67 | /* We keep a static world regulatory domain in case of the absence of CRDA */ |
68 | static const struct ieee80211_regdomain world_regdom = { | |
69 | .n_reg_rules = 1, | |
70 | .alpha2 = "00", | |
71 | .reg_rules = { | |
72 | REG_RULE(2412-10, 2462+10, 40, 6, 20, | |
73 | NL80211_RRF_PASSIVE_SCAN | | |
74 | NL80211_RRF_NO_IBSS), | |
75 | } | |
76 | }; | |
77 | ||
a3d2eaf0 JB |
78 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
79 | &world_regdom; | |
734366de JB |
80 | |
81 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
82 | static char *ieee80211_regdom = "US"; | |
83 | module_param(ieee80211_regdom, charp, 0444); | |
84 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
85 | ||
86 | /* We assume 40 MHz bandwidth for the old regulatory work. | |
87 | * We make emphasis we are using the exact same frequencies | |
88 | * as before */ | |
89 | ||
90 | static const struct ieee80211_regdomain us_regdom = { | |
91 | .n_reg_rules = 6, | |
92 | .alpha2 = "US", | |
93 | .reg_rules = { | |
94 | /* IEEE 802.11b/g, channels 1..11 */ | |
95 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
96 | /* IEEE 802.11a, channel 36 */ | |
97 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
98 | /* IEEE 802.11a, channel 40 */ | |
99 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
100 | /* IEEE 802.11a, channel 44 */ | |
101 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
102 | /* IEEE 802.11a, channels 48..64 */ | |
103 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
104 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
105 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
106 | } | |
107 | }; | |
108 | ||
109 | static const struct ieee80211_regdomain jp_regdom = { | |
110 | .n_reg_rules = 3, | |
111 | .alpha2 = "JP", | |
112 | .reg_rules = { | |
113 | /* IEEE 802.11b/g, channels 1..14 */ | |
114 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
115 | /* IEEE 802.11a, channels 34..48 */ | |
116 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
117 | NL80211_RRF_PASSIVE_SCAN), | |
118 | /* IEEE 802.11a, channels 52..64 */ | |
119 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
120 | NL80211_RRF_NO_IBSS | | |
121 | NL80211_RRF_DFS), | |
122 | } | |
123 | }; | |
124 | ||
125 | static const struct ieee80211_regdomain eu_regdom = { | |
126 | .n_reg_rules = 6, | |
127 | /* This alpha2 is bogus, we leave it here just for stupid | |
128 | * backward compatibility */ | |
129 | .alpha2 = "EU", | |
130 | .reg_rules = { | |
131 | /* IEEE 802.11b/g, channels 1..13 */ | |
132 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
133 | /* IEEE 802.11a, channel 36 */ | |
134 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
135 | NL80211_RRF_PASSIVE_SCAN), | |
136 | /* IEEE 802.11a, channel 40 */ | |
137 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
138 | NL80211_RRF_PASSIVE_SCAN), | |
139 | /* IEEE 802.11a, channel 44 */ | |
140 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
141 | NL80211_RRF_PASSIVE_SCAN), | |
142 | /* IEEE 802.11a, channels 48..64 */ | |
143 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
144 | NL80211_RRF_NO_IBSS | | |
145 | NL80211_RRF_DFS), | |
146 | /* IEEE 802.11a, channels 100..140 */ | |
147 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
148 | NL80211_RRF_NO_IBSS | | |
149 | NL80211_RRF_DFS), | |
150 | } | |
151 | }; | |
152 | ||
153 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
154 | { | |
155 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
156 | return &us_regdom; | |
157 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
158 | return &jp_regdom; | |
159 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
160 | return &eu_regdom; | |
161 | /* Default, as per the old rules */ | |
162 | return &us_regdom; | |
163 | } | |
164 | ||
a3d2eaf0 | 165 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
166 | { |
167 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
168 | return true; | |
169 | return false; | |
170 | } | |
942b25cf JB |
171 | #else |
172 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 173 | { |
942b25cf | 174 | return false; |
734366de | 175 | } |
942b25cf JB |
176 | #endif |
177 | ||
734366de JB |
178 | static void reset_regdomains(void) |
179 | { | |
942b25cf JB |
180 | /* avoid freeing static information or freeing something twice */ |
181 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
182 | cfg80211_regdomain = NULL; | |
183 | if (cfg80211_world_regdom == &world_regdom) | |
184 | cfg80211_world_regdom = NULL; | |
185 | if (cfg80211_regdomain == &world_regdom) | |
186 | cfg80211_regdomain = NULL; | |
187 | if (is_old_static_regdom(cfg80211_regdomain)) | |
188 | cfg80211_regdomain = NULL; | |
189 | ||
190 | kfree(cfg80211_regdomain); | |
191 | kfree(cfg80211_world_regdom); | |
734366de | 192 | |
a3d2eaf0 | 193 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
194 | cfg80211_regdomain = NULL; |
195 | } | |
196 | ||
197 | /* Dynamic world regulatory domain requested by the wireless | |
198 | * core upon initialization */ | |
a3d2eaf0 | 199 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 200 | { |
f6037d09 | 201 | BUG_ON(!last_request); |
734366de JB |
202 | |
203 | reset_regdomains(); | |
204 | ||
205 | cfg80211_world_regdom = rd; | |
206 | cfg80211_regdomain = rd; | |
207 | } | |
734366de | 208 | |
a3d2eaf0 | 209 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
210 | { |
211 | if (!alpha2) | |
212 | return false; | |
213 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
214 | return true; | |
215 | return false; | |
216 | } | |
8318d78a | 217 | |
a3d2eaf0 | 218 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
219 | { |
220 | if (!alpha2) | |
221 | return false; | |
222 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
223 | return true; | |
224 | return false; | |
225 | } | |
8318d78a | 226 | |
b2e1b302 LR |
227 | static bool is_alpha_upper(char letter) |
228 | { | |
229 | /* ASCII A - Z */ | |
230 | if (letter >= 65 && letter <= 90) | |
231 | return true; | |
232 | return false; | |
233 | } | |
8318d78a | 234 | |
a3d2eaf0 | 235 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
236 | { |
237 | if (!alpha2) | |
238 | return false; | |
239 | /* Special case where regulatory domain was built by driver | |
240 | * but a specific alpha2 cannot be determined */ | |
241 | if (alpha2[0] == '9' && alpha2[1] == '9') | |
242 | return true; | |
243 | return false; | |
244 | } | |
8318d78a | 245 | |
3f2355cb LR |
246 | static bool is_intersected_alpha2(const char *alpha2) |
247 | { | |
248 | if (!alpha2) | |
249 | return false; | |
250 | /* Special case where regulatory domain is the | |
251 | * result of an intersection between two regulatory domain | |
252 | * structures */ | |
253 | if (alpha2[0] == '9' && alpha2[1] == '8') | |
254 | return true; | |
255 | return false; | |
256 | } | |
257 | ||
a3d2eaf0 | 258 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
259 | { |
260 | if (!alpha2) | |
261 | return false; | |
262 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
263 | return true; | |
264 | return false; | |
265 | } | |
8318d78a | 266 | |
a3d2eaf0 | 267 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
268 | { |
269 | if (!alpha2_x || !alpha2_y) | |
270 | return false; | |
271 | if (alpha2_x[0] == alpha2_y[0] && | |
272 | alpha2_x[1] == alpha2_y[1]) | |
273 | return true; | |
274 | return false; | |
275 | } | |
276 | ||
a3d2eaf0 | 277 | static bool regdom_changed(const char *alpha2) |
b2e1b302 LR |
278 | { |
279 | if (!cfg80211_regdomain) | |
280 | return true; | |
281 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
282 | return false; | |
283 | return true; | |
284 | } | |
285 | ||
3f2355cb LR |
286 | /** |
287 | * country_ie_integrity_changes - tells us if the country IE has changed | |
288 | * @checksum: checksum of country IE of fields we are interested in | |
289 | * | |
290 | * If the country IE has not changed you can ignore it safely. This is | |
291 | * useful to determine if two devices are seeing two different country IEs | |
292 | * even on the same alpha2. Note that this will return false if no IE has | |
293 | * been set on the wireless core yet. | |
294 | */ | |
295 | static bool country_ie_integrity_changes(u32 checksum) | |
296 | { | |
297 | /* If no IE has been set then the checksum doesn't change */ | |
298 | if (unlikely(!last_request->country_ie_checksum)) | |
299 | return false; | |
300 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
301 | return true; | |
302 | return false; | |
303 | } | |
304 | ||
b2e1b302 LR |
305 | /* This lets us keep regulatory code which is updated on a regulatory |
306 | * basis in userspace. */ | |
307 | static int call_crda(const char *alpha2) | |
308 | { | |
309 | char country_env[9 + 2] = "COUNTRY="; | |
310 | char *envp[] = { | |
311 | country_env, | |
312 | NULL | |
313 | }; | |
314 | ||
315 | if (!is_world_regdom((char *) alpha2)) | |
316 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
317 | alpha2[0], alpha2[1]); | |
318 | else | |
b2e1b302 LR |
319 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
320 | "regulatory domain\n"); | |
b2e1b302 LR |
321 | |
322 | country_env[8] = alpha2[0]; | |
323 | country_env[9] = alpha2[1]; | |
324 | ||
325 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
326 | } | |
327 | ||
b2e1b302 | 328 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 329 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 330 | { |
f6037d09 JB |
331 | if (!last_request) |
332 | return false; | |
333 | ||
334 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 335 | } |
8318d78a | 336 | |
b2e1b302 | 337 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 338 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 339 | { |
a3d2eaf0 | 340 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
341 | u32 freq_diff; |
342 | ||
91e99004 | 343 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
344 | return false; |
345 | ||
346 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
347 | return false; | |
348 | ||
349 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
350 | ||
d71aaf60 | 351 | if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff) |
b2e1b302 LR |
352 | return false; |
353 | ||
354 | return true; | |
355 | } | |
356 | ||
a3d2eaf0 | 357 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 358 | { |
a3d2eaf0 | 359 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 360 | unsigned int i; |
8318d78a | 361 | |
b2e1b302 LR |
362 | if (!rd->n_reg_rules) |
363 | return false; | |
8318d78a | 364 | |
88dc1c3f LR |
365 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
366 | return false; | |
367 | ||
b2e1b302 LR |
368 | for (i = 0; i < rd->n_reg_rules; i++) { |
369 | reg_rule = &rd->reg_rules[i]; | |
370 | if (!is_valid_reg_rule(reg_rule)) | |
371 | return false; | |
372 | } | |
373 | ||
374 | return true; | |
8318d78a JB |
375 | } |
376 | ||
b2e1b302 LR |
377 | /* Returns value in KHz */ |
378 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
379 | u32 freq) | |
380 | { | |
381 | unsigned int i; | |
382 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
383 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
384 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
385 | if (start_freq_khz >= freq_range->start_freq_khz && | |
386 | end_freq_khz <= freq_range->end_freq_khz) | |
387 | return supported_bandwidths[i]; | |
388 | } | |
389 | return 0; | |
390 | } | |
8318d78a | 391 | |
0c7dc45d LR |
392 | /** |
393 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
394 | * @freq_range: frequency rule we want to query | |
395 | * @freq_khz: frequency we are inquiring about | |
396 | * | |
397 | * This lets us know if a specific frequency rule is or is not relevant to | |
398 | * a specific frequency's band. Bands are device specific and artificial | |
399 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
400 | * safe for now to assume that a frequency rule should not be part of a | |
401 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
402 | * This resolution can be lowered and should be considered as we add | |
403 | * regulatory rule support for other "bands". | |
404 | **/ | |
405 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
406 | u32 freq_khz) | |
407 | { | |
408 | #define ONE_GHZ_IN_KHZ 1000000 | |
409 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
410 | return true; | |
411 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
412 | return true; | |
413 | return false; | |
414 | #undef ONE_GHZ_IN_KHZ | |
415 | } | |
416 | ||
3f2355cb LR |
417 | /* Converts a country IE to a regulatory domain. A regulatory domain |
418 | * structure has a lot of information which the IE doesn't yet have, | |
419 | * so for the other values we use upper max values as we will intersect | |
420 | * with our userspace regulatory agent to get lower bounds. */ | |
421 | static struct ieee80211_regdomain *country_ie_2_rd( | |
422 | u8 *country_ie, | |
423 | u8 country_ie_len, | |
424 | u32 *checksum) | |
425 | { | |
426 | struct ieee80211_regdomain *rd = NULL; | |
427 | unsigned int i = 0; | |
428 | char alpha2[2]; | |
429 | u32 flags = 0; | |
430 | u32 num_rules = 0, size_of_regd = 0; | |
431 | u8 *triplets_start = NULL; | |
432 | u8 len_at_triplet = 0; | |
433 | /* the last channel we have registered in a subband (triplet) */ | |
434 | int last_sub_max_channel = 0; | |
435 | ||
436 | *checksum = 0xDEADBEEF; | |
437 | ||
438 | /* Country IE requirements */ | |
439 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
440 | country_ie_len & 0x01); | |
441 | ||
442 | alpha2[0] = country_ie[0]; | |
443 | alpha2[1] = country_ie[1]; | |
444 | ||
445 | /* | |
446 | * Third octet can be: | |
447 | * 'I' - Indoor | |
448 | * 'O' - Outdoor | |
449 | * | |
450 | * anything else we assume is no restrictions | |
451 | */ | |
452 | if (country_ie[2] == 'I') | |
453 | flags = NL80211_RRF_NO_OUTDOOR; | |
454 | else if (country_ie[2] == 'O') | |
455 | flags = NL80211_RRF_NO_INDOOR; | |
456 | ||
457 | country_ie += 3; | |
458 | country_ie_len -= 3; | |
459 | ||
460 | triplets_start = country_ie; | |
461 | len_at_triplet = country_ie_len; | |
462 | ||
463 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
464 | ||
465 | /* We need to build a reg rule for each triplet, but first we must | |
466 | * calculate the number of reg rules we will need. We will need one | |
467 | * for each channel subband */ | |
468 | while (country_ie_len >= 3) { | |
615aab4b | 469 | int end_channel = 0; |
3f2355cb LR |
470 | struct ieee80211_country_ie_triplet *triplet = |
471 | (struct ieee80211_country_ie_triplet *) country_ie; | |
472 | int cur_sub_max_channel = 0, cur_channel = 0; | |
473 | ||
474 | if (triplet->ext.reg_extension_id >= | |
475 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
476 | country_ie += 3; | |
477 | country_ie_len -= 3; | |
478 | continue; | |
479 | } | |
480 | ||
615aab4b LR |
481 | /* 2 GHz */ |
482 | if (triplet->chans.first_channel <= 14) | |
483 | end_channel = triplet->chans.first_channel + | |
484 | triplet->chans.num_channels; | |
485 | else | |
486 | /* | |
487 | * 5 GHz -- For example in country IEs if the first | |
488 | * channel given is 36 and the number of channels is 4 | |
489 | * then the individual channel numbers defined for the | |
490 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
491 | * and not 36, 37, 38, 39. | |
492 | * | |
493 | * See: http://tinyurl.com/11d-clarification | |
494 | */ | |
495 | end_channel = triplet->chans.first_channel + | |
496 | (4 * (triplet->chans.num_channels - 1)); | |
497 | ||
3f2355cb | 498 | cur_channel = triplet->chans.first_channel; |
615aab4b | 499 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
500 | |
501 | /* Basic sanity check */ | |
502 | if (cur_sub_max_channel < cur_channel) | |
503 | return NULL; | |
504 | ||
505 | /* Do not allow overlapping channels. Also channels | |
506 | * passed in each subband must be monotonically | |
507 | * increasing */ | |
508 | if (last_sub_max_channel) { | |
509 | if (cur_channel <= last_sub_max_channel) | |
510 | return NULL; | |
511 | if (cur_sub_max_channel <= last_sub_max_channel) | |
512 | return NULL; | |
513 | } | |
514 | ||
515 | /* When dot11RegulatoryClassesRequired is supported | |
516 | * we can throw ext triplets as part of this soup, | |
517 | * for now we don't care when those change as we | |
518 | * don't support them */ | |
519 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | | |
520 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
521 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
522 | ||
523 | last_sub_max_channel = cur_sub_max_channel; | |
524 | ||
525 | country_ie += 3; | |
526 | country_ie_len -= 3; | |
527 | num_rules++; | |
528 | ||
529 | /* Note: this is not a IEEE requirement but | |
530 | * simply a memory requirement */ | |
531 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) | |
532 | return NULL; | |
533 | } | |
534 | ||
535 | country_ie = triplets_start; | |
536 | country_ie_len = len_at_triplet; | |
537 | ||
538 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
539 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
540 | ||
541 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
542 | if (!rd) | |
543 | return NULL; | |
544 | ||
545 | rd->n_reg_rules = num_rules; | |
546 | rd->alpha2[0] = alpha2[0]; | |
547 | rd->alpha2[1] = alpha2[1]; | |
548 | ||
549 | /* This time around we fill in the rd */ | |
550 | while (country_ie_len >= 3) { | |
02e68a3d | 551 | int end_channel = 0; |
3f2355cb LR |
552 | struct ieee80211_country_ie_triplet *triplet = |
553 | (struct ieee80211_country_ie_triplet *) country_ie; | |
554 | struct ieee80211_reg_rule *reg_rule = NULL; | |
555 | struct ieee80211_freq_range *freq_range = NULL; | |
556 | struct ieee80211_power_rule *power_rule = NULL; | |
557 | ||
558 | /* Must parse if dot11RegulatoryClassesRequired is true, | |
559 | * we don't support this yet */ | |
560 | if (triplet->ext.reg_extension_id >= | |
561 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
562 | country_ie += 3; | |
563 | country_ie_len -= 3; | |
564 | continue; | |
565 | } | |
566 | ||
567 | reg_rule = &rd->reg_rules[i]; | |
568 | freq_range = ®_rule->freq_range; | |
569 | power_rule = ®_rule->power_rule; | |
570 | ||
571 | reg_rule->flags = flags; | |
572 | ||
02e68a3d LR |
573 | /* 2 GHz */ |
574 | if (triplet->chans.first_channel <= 14) | |
575 | end_channel = triplet->chans.first_channel + | |
576 | triplet->chans.num_channels; | |
577 | else | |
02e68a3d LR |
578 | end_channel = triplet->chans.first_channel + |
579 | (4 * (triplet->chans.num_channels - 1)); | |
580 | ||
3f2355cb LR |
581 | /* The +10 is since the regulatory domain expects |
582 | * the actual band edge, not the center of freq for | |
583 | * its start and end freqs, assuming 20 MHz bandwidth on | |
584 | * the channels passed */ | |
585 | freq_range->start_freq_khz = | |
586 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
587 | triplet->chans.first_channel) - 10); | |
588 | freq_range->end_freq_khz = | |
589 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 590 | end_channel) + 10); |
3f2355cb LR |
591 | |
592 | /* Large arbitrary values, we intersect later */ | |
593 | /* Increment this if we ever support >= 40 MHz channels | |
594 | * in IEEE 802.11 */ | |
595 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); | |
596 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
597 | power_rule->max_eirp = DBM_TO_MBM(100); | |
598 | ||
599 | country_ie += 3; | |
600 | country_ie_len -= 3; | |
601 | i++; | |
602 | ||
603 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
604 | } | |
605 | ||
606 | return rd; | |
607 | } | |
608 | ||
609 | ||
9c96477d LR |
610 | /* Helper for regdom_intersect(), this does the real |
611 | * mathematical intersection fun */ | |
612 | static int reg_rules_intersect( | |
613 | const struct ieee80211_reg_rule *rule1, | |
614 | const struct ieee80211_reg_rule *rule2, | |
615 | struct ieee80211_reg_rule *intersected_rule) | |
616 | { | |
617 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
618 | struct ieee80211_freq_range *freq_range; | |
619 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
620 | struct ieee80211_power_rule *power_rule; | |
621 | u32 freq_diff; | |
622 | ||
623 | freq_range1 = &rule1->freq_range; | |
624 | freq_range2 = &rule2->freq_range; | |
625 | freq_range = &intersected_rule->freq_range; | |
626 | ||
627 | power_rule1 = &rule1->power_rule; | |
628 | power_rule2 = &rule2->power_rule; | |
629 | power_rule = &intersected_rule->power_rule; | |
630 | ||
631 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
632 | freq_range2->start_freq_khz); | |
633 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
634 | freq_range2->end_freq_khz); | |
635 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
636 | freq_range2->max_bandwidth_khz); | |
637 | ||
638 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
639 | if (freq_range->max_bandwidth_khz > freq_diff) | |
640 | freq_range->max_bandwidth_khz = freq_diff; | |
641 | ||
642 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
643 | power_rule2->max_eirp); | |
644 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
645 | power_rule2->max_antenna_gain); | |
646 | ||
647 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
648 | ||
649 | if (!is_valid_reg_rule(intersected_rule)) | |
650 | return -EINVAL; | |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
655 | /** | |
656 | * regdom_intersect - do the intersection between two regulatory domains | |
657 | * @rd1: first regulatory domain | |
658 | * @rd2: second regulatory domain | |
659 | * | |
660 | * Use this function to get the intersection between two regulatory domains. | |
661 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
662 | * as no one single alpha2 can represent this regulatory domain. | |
663 | * | |
664 | * Returns a pointer to the regulatory domain structure which will hold the | |
665 | * resulting intersection of rules between rd1 and rd2. We will | |
666 | * kzalloc() this structure for you. | |
667 | */ | |
668 | static struct ieee80211_regdomain *regdom_intersect( | |
669 | const struct ieee80211_regdomain *rd1, | |
670 | const struct ieee80211_regdomain *rd2) | |
671 | { | |
672 | int r, size_of_regd; | |
673 | unsigned int x, y; | |
674 | unsigned int num_rules = 0, rule_idx = 0; | |
675 | const struct ieee80211_reg_rule *rule1, *rule2; | |
676 | struct ieee80211_reg_rule *intersected_rule; | |
677 | struct ieee80211_regdomain *rd; | |
678 | /* This is just a dummy holder to help us count */ | |
679 | struct ieee80211_reg_rule irule; | |
680 | ||
681 | /* Uses the stack temporarily for counter arithmetic */ | |
682 | intersected_rule = &irule; | |
683 | ||
684 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
685 | ||
686 | if (!rd1 || !rd2) | |
687 | return NULL; | |
688 | ||
689 | /* First we get a count of the rules we'll need, then we actually | |
690 | * build them. This is to so we can malloc() and free() a | |
691 | * regdomain once. The reason we use reg_rules_intersect() here | |
692 | * is it will return -EINVAL if the rule computed makes no sense. | |
693 | * All rules that do check out OK are valid. */ | |
694 | ||
695 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
696 | rule1 = &rd1->reg_rules[x]; | |
697 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
698 | rule2 = &rd2->reg_rules[y]; | |
699 | if (!reg_rules_intersect(rule1, rule2, | |
700 | intersected_rule)) | |
701 | num_rules++; | |
702 | memset(intersected_rule, 0, | |
703 | sizeof(struct ieee80211_reg_rule)); | |
704 | } | |
705 | } | |
706 | ||
707 | if (!num_rules) | |
708 | return NULL; | |
709 | ||
710 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
711 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
712 | ||
713 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
714 | if (!rd) | |
715 | return NULL; | |
716 | ||
717 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
718 | rule1 = &rd1->reg_rules[x]; | |
719 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
720 | rule2 = &rd2->reg_rules[y]; | |
721 | /* This time around instead of using the stack lets | |
722 | * write to the target rule directly saving ourselves | |
723 | * a memcpy() */ | |
724 | intersected_rule = &rd->reg_rules[rule_idx]; | |
725 | r = reg_rules_intersect(rule1, rule2, | |
726 | intersected_rule); | |
727 | /* No need to memset here the intersected rule here as | |
728 | * we're not using the stack anymore */ | |
729 | if (r) | |
730 | continue; | |
731 | rule_idx++; | |
732 | } | |
733 | } | |
734 | ||
735 | if (rule_idx != num_rules) { | |
736 | kfree(rd); | |
737 | return NULL; | |
738 | } | |
739 | ||
740 | rd->n_reg_rules = num_rules; | |
741 | rd->alpha2[0] = '9'; | |
742 | rd->alpha2[1] = '8'; | |
743 | ||
744 | return rd; | |
745 | } | |
746 | ||
b2e1b302 LR |
747 | /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may |
748 | * want to just have the channel structure use these */ | |
749 | static u32 map_regdom_flags(u32 rd_flags) | |
750 | { | |
751 | u32 channel_flags = 0; | |
752 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
753 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
754 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
755 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
756 | if (rd_flags & NL80211_RRF_DFS) | |
757 | channel_flags |= IEEE80211_CHAN_RADAR; | |
758 | return channel_flags; | |
759 | } | |
760 | ||
1fa25e41 LR |
761 | static int freq_reg_info_regd(struct wiphy *wiphy, |
762 | u32 center_freq, | |
763 | u32 *bandwidth, | |
764 | const struct ieee80211_reg_rule **reg_rule, | |
765 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
766 | { |
767 | int i; | |
0c7dc45d | 768 | bool band_rule_found = false; |
3e0c3ff3 | 769 | const struct ieee80211_regdomain *regd; |
b2e1b302 | 770 | u32 max_bandwidth = 0; |
8318d78a | 771 | |
1fa25e41 | 772 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 LR |
773 | |
774 | /* Follow the driver's regulatory domain, if present, unless a country | |
24ed1da1 | 775 | * IE has been processed or a user wants to help complaince further */ |
3e0c3ff3 | 776 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE && |
24ed1da1 | 777 | last_request->initiator != REGDOM_SET_BY_USER && |
3e0c3ff3 LR |
778 | wiphy->regd) |
779 | regd = wiphy->regd; | |
780 | ||
781 | if (!regd) | |
b2e1b302 LR |
782 | return -EINVAL; |
783 | ||
3e0c3ff3 | 784 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
785 | const struct ieee80211_reg_rule *rr; |
786 | const struct ieee80211_freq_range *fr = NULL; | |
787 | const struct ieee80211_power_rule *pr = NULL; | |
788 | ||
3e0c3ff3 | 789 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
790 | fr = &rr->freq_range; |
791 | pr = &rr->power_rule; | |
0c7dc45d LR |
792 | |
793 | /* We only need to know if one frequency rule was | |
794 | * was in center_freq's band, that's enough, so lets | |
795 | * not overwrite it once found */ | |
796 | if (!band_rule_found) | |
797 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
798 | ||
b2e1b302 | 799 | max_bandwidth = freq_max_bandwidth(fr, center_freq); |
0c7dc45d | 800 | |
b2e1b302 LR |
801 | if (max_bandwidth && *bandwidth <= max_bandwidth) { |
802 | *reg_rule = rr; | |
803 | *bandwidth = max_bandwidth; | |
8318d78a JB |
804 | break; |
805 | } | |
806 | } | |
807 | ||
0c7dc45d LR |
808 | if (!band_rule_found) |
809 | return -ERANGE; | |
810 | ||
b2e1b302 LR |
811 | return !max_bandwidth; |
812 | } | |
34f57347 | 813 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 814 | |
34f57347 | 815 | int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth, |
1fa25e41 LR |
816 | const struct ieee80211_reg_rule **reg_rule) |
817 | { | |
818 | return freq_reg_info_regd(wiphy, center_freq, | |
819 | bandwidth, reg_rule, NULL); | |
820 | } | |
b2e1b302 | 821 | |
a92a3ce7 LR |
822 | static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, |
823 | unsigned int chan_idx) | |
b2e1b302 LR |
824 | { |
825 | int r; | |
a92a3ce7 | 826 | u32 flags; |
b2e1b302 LR |
827 | u32 max_bandwidth = 0; |
828 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
829 | const struct ieee80211_power_rule *power_rule = NULL; | |
a92a3ce7 LR |
830 | struct ieee80211_supported_band *sband; |
831 | struct ieee80211_channel *chan; | |
832 | ||
833 | sband = wiphy->bands[band]; | |
834 | BUG_ON(chan_idx >= sband->n_channels); | |
835 | chan = &sband->channels[chan_idx]; | |
836 | ||
837 | flags = chan->orig_flags; | |
b2e1b302 | 838 | |
3e0c3ff3 | 839 | r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq), |
b2e1b302 LR |
840 | &max_bandwidth, ®_rule); |
841 | ||
842 | if (r) { | |
0c7dc45d LR |
843 | /* This means no regulatory rule was found in the country IE |
844 | * with a frequency range on the center_freq's band, since | |
845 | * IEEE-802.11 allows for a country IE to have a subset of the | |
846 | * regulatory information provided in a country we ignore | |
847 | * disabling the channel unless at least one reg rule was | |
848 | * found on the center_freq's band. For details see this | |
849 | * clarification: | |
850 | * | |
851 | * http://tinyurl.com/11d-clarification | |
852 | */ | |
853 | if (r == -ERANGE && | |
854 | last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
855 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
856 | printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " | |
857 | "intact on %s - no rule found in band on " | |
858 | "Country IE\n", | |
859 | chan->center_freq, wiphy_name(wiphy)); | |
860 | #endif | |
861 | } else { | |
862 | /* In this case we know the country IE has at least one reg rule | |
863 | * for the band so we respect its band definitions */ | |
864 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
865 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
866 | printk(KERN_DEBUG "cfg80211: Disabling " | |
867 | "channel %d MHz on %s due to " | |
868 | "Country IE\n", | |
869 | chan->center_freq, wiphy_name(wiphy)); | |
870 | #endif | |
871 | flags |= IEEE80211_CHAN_DISABLED; | |
872 | chan->flags = flags; | |
873 | } | |
8318d78a JB |
874 | return; |
875 | } | |
876 | ||
b2e1b302 LR |
877 | power_rule = ®_rule->power_rule; |
878 | ||
f976376d LR |
879 | if (last_request->initiator == REGDOM_SET_BY_DRIVER && |
880 | last_request->wiphy && last_request->wiphy == wiphy && | |
881 | last_request->wiphy->strict_regulatory) { | |
882 | /* This gaurantees the driver's requested regulatory domain | |
883 | * will always be used as a base for further regulatory | |
884 | * settings */ | |
885 | chan->flags = chan->orig_flags = | |
886 | map_regdom_flags(reg_rule->flags); | |
887 | chan->max_antenna_gain = chan->orig_mag = | |
888 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
889 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
890 | chan->max_power = chan->orig_mpwr = | |
891 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
892 | return; | |
893 | } | |
894 | ||
b2e1b302 | 895 | chan->flags = flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 896 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
897 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
898 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 899 | if (chan->orig_mpwr) |
b2e1b302 LR |
900 | chan->max_power = min(chan->orig_mpwr, |
901 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 902 | else |
b2e1b302 | 903 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
904 | } |
905 | ||
a92a3ce7 | 906 | static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) |
8318d78a | 907 | { |
a92a3ce7 LR |
908 | unsigned int i; |
909 | struct ieee80211_supported_band *sband; | |
910 | ||
911 | BUG_ON(!wiphy->bands[band]); | |
912 | sband = wiphy->bands[band]; | |
8318d78a JB |
913 | |
914 | for (i = 0; i < sband->n_channels; i++) | |
a92a3ce7 | 915 | handle_channel(wiphy, band, i); |
8318d78a JB |
916 | } |
917 | ||
14b9815a LR |
918 | static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby) |
919 | { | |
920 | if (!last_request) | |
921 | return true; | |
922 | if (setby == REGDOM_SET_BY_CORE && | |
2a44f911 | 923 | wiphy->custom_regulatory) |
14b9815a | 924 | return true; |
f976376d LR |
925 | /* wiphy->regd will be set once the device has its own |
926 | * desired regulatory domain set */ | |
927 | if (wiphy->strict_regulatory && !wiphy->regd && | |
928 | !is_world_regdom(last_request->alpha2)) | |
14b9815a LR |
929 | return true; |
930 | return false; | |
931 | } | |
932 | ||
b2e1b302 | 933 | static void update_all_wiphy_regulatory(enum reg_set_by setby) |
8318d78a | 934 | { |
b2e1b302 | 935 | struct cfg80211_registered_device *drv; |
8318d78a | 936 | |
b2e1b302 | 937 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
d46e5b1d | 938 | wiphy_update_regulatory(&drv->wiphy, setby); |
b2e1b302 LR |
939 | } |
940 | ||
941 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
942 | { | |
943 | enum ieee80211_band band; | |
d46e5b1d LR |
944 | |
945 | if (ignore_reg_update(wiphy, setby)) | |
946 | return; | |
b2e1b302 | 947 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 948 | if (wiphy->bands[band]) |
a92a3ce7 | 949 | handle_band(wiphy, band); |
b2e1b302 | 950 | } |
560e28e1 | 951 | if (wiphy->reg_notifier) |
716f9392 | 952 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
953 | } |
954 | ||
1fa25e41 LR |
955 | static void handle_channel_custom(struct wiphy *wiphy, |
956 | enum ieee80211_band band, | |
957 | unsigned int chan_idx, | |
958 | const struct ieee80211_regdomain *regd) | |
959 | { | |
960 | int r; | |
961 | u32 max_bandwidth = 0; | |
962 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
963 | const struct ieee80211_power_rule *power_rule = NULL; | |
964 | struct ieee80211_supported_band *sband; | |
965 | struct ieee80211_channel *chan; | |
966 | ||
967 | sband = wiphy->bands[band]; | |
968 | BUG_ON(chan_idx >= sband->n_channels); | |
969 | chan = &sband->channels[chan_idx]; | |
970 | ||
971 | r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq), | |
972 | &max_bandwidth, ®_rule, regd); | |
973 | ||
974 | if (r) { | |
975 | chan->flags = IEEE80211_CHAN_DISABLED; | |
976 | return; | |
977 | } | |
978 | ||
979 | power_rule = ®_rule->power_rule; | |
980 | ||
981 | chan->flags |= map_regdom_flags(reg_rule->flags); | |
982 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
983 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
984 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
985 | } | |
986 | ||
987 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
988 | const struct ieee80211_regdomain *regd) | |
989 | { | |
990 | unsigned int i; | |
991 | struct ieee80211_supported_band *sband; | |
992 | ||
993 | BUG_ON(!wiphy->bands[band]); | |
994 | sband = wiphy->bands[band]; | |
995 | ||
996 | for (i = 0; i < sband->n_channels; i++) | |
997 | handle_channel_custom(wiphy, band, i, regd); | |
998 | } | |
999 | ||
1000 | /* Used by drivers prior to wiphy registration */ | |
1001 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1002 | const struct ieee80211_regdomain *regd) | |
1003 | { | |
1004 | enum ieee80211_band band; | |
1005 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1006 | if (wiphy->bands[band]) | |
1007 | handle_band_custom(wiphy, band, regd); | |
b2e1b302 LR |
1008 | } |
1009 | } | |
1fa25e41 LR |
1010 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1011 | ||
3e0c3ff3 LR |
1012 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
1013 | const struct ieee80211_regdomain *src_regd) | |
1014 | { | |
1015 | struct ieee80211_regdomain *regd; | |
1016 | int size_of_regd = 0; | |
1017 | unsigned int i; | |
1018 | ||
1019 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1020 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
1021 | ||
1022 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
1023 | if (!regd) | |
1024 | return -ENOMEM; | |
1025 | ||
1026 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
1027 | ||
1028 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
1029 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
1030 | sizeof(struct ieee80211_reg_rule)); | |
1031 | ||
1032 | *dst_regd = regd; | |
1033 | return 0; | |
1034 | } | |
b2e1b302 | 1035 | |
9c96477d LR |
1036 | /* Return value which can be used by ignore_request() to indicate |
1037 | * it has been determined we should intersect two regulatory domains */ | |
1038 | #define REG_INTERSECT 1 | |
1039 | ||
84fa4f43 JB |
1040 | /* This has the logic which determines when a new request |
1041 | * should be ignored. */ | |
1042 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
1043 | const char *alpha2) | |
1044 | { | |
1045 | /* All initial requests are respected */ | |
1046 | if (!last_request) | |
1047 | return 0; | |
1048 | ||
1049 | switch (set_by) { | |
1050 | case REGDOM_SET_BY_INIT: | |
1051 | return -EINVAL; | |
1052 | case REGDOM_SET_BY_CORE: | |
ba25c141 | 1053 | return -EINVAL; |
84fa4f43 JB |
1054 | case REGDOM_SET_BY_COUNTRY_IE: |
1055 | if (unlikely(!is_an_alpha2(alpha2))) | |
1056 | return -EINVAL; | |
1057 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
1058 | if (last_request->wiphy != wiphy) { | |
1059 | /* | |
1060 | * Two cards with two APs claiming different | |
1061 | * different Country IE alpha2s. We could | |
1062 | * intersect them, but that seems unlikely | |
1063 | * to be correct. Reject second one for now. | |
1064 | */ | |
1065 | if (!alpha2_equal(alpha2, | |
1066 | cfg80211_regdomain->alpha2)) | |
1067 | return -EOPNOTSUPP; | |
1068 | return -EALREADY; | |
1069 | } | |
3f2355cb LR |
1070 | /* Two consecutive Country IE hints on the same wiphy. |
1071 | * This should be picked up early by the driver/stack */ | |
1072 | if (WARN_ON(!alpha2_equal(cfg80211_regdomain->alpha2, | |
1073 | alpha2))) | |
84fa4f43 JB |
1074 | return 0; |
1075 | return -EALREADY; | |
1076 | } | |
3f2355cb | 1077 | return REG_INTERSECT; |
84fa4f43 | 1078 | case REGDOM_SET_BY_DRIVER: |
e74b1e7f LR |
1079 | if (last_request->initiator == REGDOM_SET_BY_CORE) { |
1080 | if (is_old_static_regdom(cfg80211_regdomain)) | |
1081 | return 0; | |
1082 | if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
1083 | return 0; | |
84fa4f43 | 1084 | return -EALREADY; |
e74b1e7f | 1085 | } |
3e0c3ff3 | 1086 | return REG_INTERSECT; |
84fa4f43 | 1087 | case REGDOM_SET_BY_USER: |
84fa4f43 | 1088 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) |
9c96477d | 1089 | return REG_INTERSECT; |
3f2355cb LR |
1090 | /* If the user knows better the user should set the regdom |
1091 | * to their country before the IE is picked up */ | |
1092 | if (last_request->initiator == REGDOM_SET_BY_USER && | |
1093 | last_request->intersect) | |
1094 | return -EOPNOTSUPP; | |
5eebade6 LR |
1095 | /* Process user requests only after previous user/driver/core |
1096 | * requests have been processed */ | |
1097 | if (last_request->initiator == REGDOM_SET_BY_CORE || | |
1098 | last_request->initiator == REGDOM_SET_BY_DRIVER || | |
1099 | last_request->initiator == REGDOM_SET_BY_USER) { | |
1100 | if (!alpha2_equal(last_request->alpha2, | |
1101 | cfg80211_regdomain->alpha2)) | |
1102 | return -EAGAIN; | |
1103 | } | |
1104 | ||
e74b1e7f LR |
1105 | if (!is_old_static_regdom(cfg80211_regdomain) && |
1106 | alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
1107 | return -EALREADY; | |
1108 | ||
84fa4f43 JB |
1109 | return 0; |
1110 | } | |
1111 | ||
1112 | return -EINVAL; | |
1113 | } | |
1114 | ||
a1794390 | 1115 | /* Caller must hold &cfg80211_mutex */ |
b2e1b302 | 1116 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, |
3f2355cb LR |
1117 | const char *alpha2, |
1118 | u32 country_ie_checksum, | |
1119 | enum environment_cap env) | |
b2e1b302 LR |
1120 | { |
1121 | struct regulatory_request *request; | |
9c96477d | 1122 | bool intersect = false; |
b2e1b302 LR |
1123 | int r = 0; |
1124 | ||
be3d4810 | 1125 | r = ignore_request(wiphy, set_by, alpha2); |
9c96477d | 1126 | |
3e0c3ff3 LR |
1127 | if (r == REG_INTERSECT) { |
1128 | if (set_by == REGDOM_SET_BY_DRIVER) { | |
1129 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); | |
1130 | if (r) | |
1131 | return r; | |
1132 | } | |
9c96477d | 1133 | intersect = true; |
3e0c3ff3 LR |
1134 | } else if (r) { |
1135 | /* If the regulatory domain being requested by the | |
1136 | * driver has already been set just copy it to the | |
1137 | * wiphy */ | |
1138 | if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) { | |
1139 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); | |
1140 | if (r) | |
1141 | return r; | |
1142 | r = -EALREADY; | |
1143 | goto new_request; | |
1144 | } | |
b2e1b302 | 1145 | return r; |
3e0c3ff3 | 1146 | } |
b2e1b302 | 1147 | |
3e0c3ff3 | 1148 | new_request: |
5203cdb6 LR |
1149 | request = kzalloc(sizeof(struct regulatory_request), |
1150 | GFP_KERNEL); | |
1151 | if (!request) | |
1152 | return -ENOMEM; | |
1153 | ||
1154 | request->alpha2[0] = alpha2[0]; | |
1155 | request->alpha2[1] = alpha2[1]; | |
1156 | request->initiator = set_by; | |
1157 | request->wiphy = wiphy; | |
1158 | request->intersect = intersect; | |
3f2355cb LR |
1159 | request->country_ie_checksum = country_ie_checksum; |
1160 | request->country_ie_env = env; | |
5203cdb6 LR |
1161 | |
1162 | kfree(last_request); | |
1163 | last_request = request; | |
3e0c3ff3 LR |
1164 | |
1165 | /* When r == REG_INTERSECT we do need to call CRDA */ | |
1166 | if (r < 0) | |
1167 | return r; | |
1168 | ||
3f2355cb LR |
1169 | /* |
1170 | * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled | |
1171 | * AND if CRDA is NOT present nothing will happen, if someone | |
1172 | * wants to bother with 11d with OLD_REG you can add a timer. | |
1173 | * If after x amount of time nothing happens you can call: | |
1174 | * | |
1175 | * return set_regdom(country_ie_regdomain); | |
1176 | * | |
1177 | * to intersect with the static rd | |
1178 | */ | |
02ba0b32 | 1179 | return call_crda(alpha2); |
b2e1b302 LR |
1180 | } |
1181 | ||
ba25c141 LR |
1182 | static int regulatory_hint_core(const char *alpha2) |
1183 | { | |
1184 | struct regulatory_request *request; | |
1185 | ||
1186 | BUG_ON(last_request); | |
1187 | ||
1188 | request = kzalloc(sizeof(struct regulatory_request), | |
1189 | GFP_KERNEL); | |
1190 | if (!request) | |
1191 | return -ENOMEM; | |
1192 | ||
1193 | request->alpha2[0] = alpha2[0]; | |
1194 | request->alpha2[1] = alpha2[1]; | |
1195 | request->initiator = REGDOM_SET_BY_CORE; | |
1196 | ||
1197 | last_request = request; | |
1198 | ||
1199 | return call_crda(alpha2); | |
1200 | } | |
1201 | ||
be3d4810 | 1202 | void regulatory_hint(struct wiphy *wiphy, const char *alpha2) |
b2e1b302 | 1203 | { |
f976376d | 1204 | int r; |
be3d4810 | 1205 | BUG_ON(!alpha2); |
b2e1b302 | 1206 | |
a1794390 | 1207 | mutex_lock(&cfg80211_mutex); |
f976376d LR |
1208 | r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, |
1209 | alpha2, 0, ENVIRON_ANY); | |
1210 | /* This is required so that the orig_* parameters are saved */ | |
1211 | if (r == -EALREADY && wiphy->strict_regulatory) | |
1212 | wiphy_update_regulatory(wiphy, REGDOM_SET_BY_DRIVER); | |
a1794390 | 1213 | mutex_unlock(&cfg80211_mutex); |
b2e1b302 LR |
1214 | } |
1215 | EXPORT_SYMBOL(regulatory_hint); | |
1216 | ||
3f2355cb LR |
1217 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, |
1218 | u32 country_ie_checksum) | |
1219 | { | |
1220 | if (!last_request->wiphy) | |
1221 | return false; | |
1222 | if (likely(last_request->wiphy != wiphy)) | |
1223 | return !country_ie_integrity_changes(country_ie_checksum); | |
1224 | /* We should not have let these through at this point, they | |
1225 | * should have been picked up earlier by the first alpha2 check | |
1226 | * on the device */ | |
1227 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) | |
1228 | return true; | |
1229 | return false; | |
1230 | } | |
1231 | ||
1232 | void regulatory_hint_11d(struct wiphy *wiphy, | |
1233 | u8 *country_ie, | |
1234 | u8 country_ie_len) | |
1235 | { | |
1236 | struct ieee80211_regdomain *rd = NULL; | |
1237 | char alpha2[2]; | |
1238 | u32 checksum = 0; | |
1239 | enum environment_cap env = ENVIRON_ANY; | |
1240 | ||
0f70f398 JB |
1241 | if (!last_request) |
1242 | return; | |
1243 | ||
a1794390 | 1244 | mutex_lock(&cfg80211_mutex); |
3f2355cb LR |
1245 | |
1246 | /* IE len must be evenly divisible by 2 */ | |
1247 | if (country_ie_len & 0x01) | |
1248 | goto out; | |
1249 | ||
1250 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1251 | goto out; | |
1252 | ||
1253 | /* Pending country IE processing, this can happen after we | |
1254 | * call CRDA and wait for a response if a beacon was received before | |
1255 | * we were able to process the last regulatory_hint_11d() call */ | |
1256 | if (country_ie_regdomain) | |
1257 | goto out; | |
1258 | ||
1259 | alpha2[0] = country_ie[0]; | |
1260 | alpha2[1] = country_ie[1]; | |
1261 | ||
1262 | if (country_ie[2] == 'I') | |
1263 | env = ENVIRON_INDOOR; | |
1264 | else if (country_ie[2] == 'O') | |
1265 | env = ENVIRON_OUTDOOR; | |
1266 | ||
1267 | /* We will run this for *every* beacon processed for the BSSID, so | |
1268 | * we optimize an early check to exit out early if we don't have to | |
1269 | * do anything */ | |
1270 | if (likely(last_request->wiphy)) { | |
1271 | struct cfg80211_registered_device *drv_last_ie; | |
1272 | ||
1273 | drv_last_ie = wiphy_to_dev(last_request->wiphy); | |
1274 | ||
1275 | /* Lets keep this simple -- we trust the first AP | |
1276 | * after we intersect with CRDA */ | |
1277 | if (likely(last_request->wiphy == wiphy)) { | |
1278 | /* Ignore IEs coming in on this wiphy with | |
1279 | * the same alpha2 and environment cap */ | |
1280 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, | |
1281 | alpha2) && | |
1282 | env == drv_last_ie->env)) { | |
1283 | goto out; | |
1284 | } | |
1285 | /* the wiphy moved on to another BSSID or the AP | |
1286 | * was reconfigured. XXX: We need to deal with the | |
1287 | * case where the user suspends and goes to goes | |
1288 | * to another country, and then gets IEs from an | |
1289 | * AP with different settings */ | |
1290 | goto out; | |
1291 | } else { | |
1292 | /* Ignore IEs coming in on two separate wiphys with | |
1293 | * the same alpha2 and environment cap */ | |
1294 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, | |
1295 | alpha2) && | |
1296 | env == drv_last_ie->env)) { | |
1297 | goto out; | |
1298 | } | |
1299 | /* We could potentially intersect though */ | |
1300 | goto out; | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); | |
1305 | if (!rd) | |
1306 | goto out; | |
1307 | ||
1308 | /* This will not happen right now but we leave it here for the | |
1309 | * the future when we want to add suspend/resume support and having | |
1310 | * the user move to another country after doing so, or having the user | |
1311 | * move to another AP. Right now we just trust the first AP. This is why | |
1312 | * this is marked as likley(). If we hit this before we add this support | |
1313 | * we want to be informed of it as it would indicate a mistake in the | |
1314 | * current design */ | |
1315 | if (likely(WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))) | |
1316 | goto out; | |
1317 | ||
1318 | /* We keep this around for when CRDA comes back with a response so | |
1319 | * we can intersect with that */ | |
1320 | country_ie_regdomain = rd; | |
1321 | ||
1322 | __regulatory_hint(wiphy, REGDOM_SET_BY_COUNTRY_IE, | |
1323 | country_ie_regdomain->alpha2, checksum, env); | |
1324 | ||
1325 | out: | |
a1794390 | 1326 | mutex_unlock(&cfg80211_mutex); |
3f2355cb LR |
1327 | } |
1328 | EXPORT_SYMBOL(regulatory_hint_11d); | |
b2e1b302 | 1329 | |
a3d2eaf0 | 1330 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1331 | { |
1332 | unsigned int i; | |
a3d2eaf0 JB |
1333 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1334 | const struct ieee80211_freq_range *freq_range = NULL; | |
1335 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
1336 | |
1337 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
1338 | "(max_antenna_gain, max_eirp)\n"); | |
1339 | ||
1340 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1341 | reg_rule = &rd->reg_rules[i]; | |
1342 | freq_range = ®_rule->freq_range; | |
1343 | power_rule = ®_rule->power_rule; | |
1344 | ||
1345 | /* There may not be documentation for max antenna gain | |
1346 | * in certain regions */ | |
1347 | if (power_rule->max_antenna_gain) | |
1348 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1349 | "(%d mBi, %d mBm)\n", | |
1350 | freq_range->start_freq_khz, | |
1351 | freq_range->end_freq_khz, | |
1352 | freq_range->max_bandwidth_khz, | |
1353 | power_rule->max_antenna_gain, | |
1354 | power_rule->max_eirp); | |
1355 | else | |
1356 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1357 | "(N/A, %d mBm)\n", | |
1358 | freq_range->start_freq_khz, | |
1359 | freq_range->end_freq_khz, | |
1360 | freq_range->max_bandwidth_khz, | |
1361 | power_rule->max_eirp); | |
1362 | } | |
1363 | } | |
1364 | ||
a3d2eaf0 | 1365 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1366 | { |
1367 | ||
3f2355cb LR |
1368 | if (is_intersected_alpha2(rd->alpha2)) { |
1369 | struct wiphy *wiphy = NULL; | |
1370 | struct cfg80211_registered_device *drv; | |
1371 | ||
1372 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
1373 | if (last_request->wiphy) { | |
1374 | wiphy = last_request->wiphy; | |
1375 | drv = wiphy_to_dev(wiphy); | |
1376 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1377 | "domain updated by AP to: %c%c\n", | |
1378 | drv->country_ie_alpha2[0], | |
1379 | drv->country_ie_alpha2[1]); | |
1380 | } else | |
1381 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1382 | "domain intersected: \n"); | |
1383 | } else | |
1384 | printk(KERN_INFO "cfg80211: Current regulatory " | |
039498c6 | 1385 | "domain intersected: \n"); |
3f2355cb | 1386 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
1387 | printk(KERN_INFO "cfg80211: World regulatory " |
1388 | "domain updated:\n"); | |
1389 | else { | |
1390 | if (is_unknown_alpha2(rd->alpha2)) | |
1391 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1392 | "changed to driver built-in settings " | |
1393 | "(unknown country)\n"); | |
1394 | else | |
1395 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1396 | "changed to country: %c%c\n", | |
1397 | rd->alpha2[0], rd->alpha2[1]); | |
1398 | } | |
1399 | print_rd_rules(rd); | |
1400 | } | |
1401 | ||
2df78167 | 1402 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1403 | { |
1404 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1405 | rd->alpha2[0], rd->alpha2[1]); | |
1406 | print_rd_rules(rd); | |
1407 | } | |
1408 | ||
3f2355cb LR |
1409 | #ifdef CONFIG_CFG80211_REG_DEBUG |
1410 | static void reg_country_ie_process_debug( | |
1411 | const struct ieee80211_regdomain *rd, | |
1412 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1413 | const struct ieee80211_regdomain *intersected_rd) | |
1414 | { | |
1415 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
1416 | print_regdomain_info(country_ie_regdomain); | |
1417 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
1418 | print_regdomain_info(rd); | |
1419 | if (intersected_rd) { | |
1420 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
1421 | "and get:\n"); | |
667ecd01 | 1422 | print_regdomain_info(intersected_rd); |
3f2355cb LR |
1423 | return; |
1424 | } | |
1425 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
1426 | } | |
1427 | #else | |
1428 | static inline void reg_country_ie_process_debug( | |
1429 | const struct ieee80211_regdomain *rd, | |
1430 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1431 | const struct ieee80211_regdomain *intersected_rd) | |
1432 | { | |
1433 | } | |
1434 | #endif | |
1435 | ||
d2372b31 | 1436 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1437 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1438 | { |
9c96477d | 1439 | const struct ieee80211_regdomain *intersected_rd = NULL; |
3f2355cb LR |
1440 | struct cfg80211_registered_device *drv = NULL; |
1441 | struct wiphy *wiphy = NULL; | |
b2e1b302 LR |
1442 | /* Some basic sanity checks first */ |
1443 | ||
b2e1b302 | 1444 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1445 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1446 | return -EINVAL; |
1447 | update_world_regdomain(rd); | |
1448 | return 0; | |
1449 | } | |
b2e1b302 LR |
1450 | |
1451 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1452 | !is_unknown_alpha2(rd->alpha2)) | |
1453 | return -EINVAL; | |
1454 | ||
f6037d09 | 1455 | if (!last_request) |
b2e1b302 LR |
1456 | return -EINVAL; |
1457 | ||
3f2355cb LR |
1458 | /* Lets only bother proceeding on the same alpha2 if the current |
1459 | * rd is non static (it means CRDA was present and was used last) | |
1460 | * and the pending request came in from a country IE */ | |
1461 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
1462 | /* If someone else asked us to change the rd lets only bother | |
1463 | * checking if the alpha2 changes if CRDA was already called */ | |
1464 | if (!is_old_static_regdom(cfg80211_regdomain) && | |
1465 | !regdom_changed(rd->alpha2)) | |
1466 | return -EINVAL; | |
1467 | } | |
1468 | ||
1469 | wiphy = last_request->wiphy; | |
b2e1b302 LR |
1470 | |
1471 | /* Now lets set the regulatory domain, update all driver channels | |
1472 | * and finally inform them of what we have done, in case they want | |
1473 | * to review or adjust their own settings based on their own | |
1474 | * internal EEPROM data */ | |
1475 | ||
f6037d09 | 1476 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1477 | return -EINVAL; |
1478 | ||
8375af3b LR |
1479 | if (!is_valid_rd(rd)) { |
1480 | printk(KERN_ERR "cfg80211: Invalid " | |
1481 | "regulatory domain detected:\n"); | |
1482 | print_regdomain_info(rd); | |
1483 | return -EINVAL; | |
b2e1b302 LR |
1484 | } |
1485 | ||
b8295acd | 1486 | if (!last_request->intersect) { |
3e0c3ff3 LR |
1487 | int r; |
1488 | ||
1489 | if (last_request->initiator != REGDOM_SET_BY_DRIVER) { | |
1490 | reset_regdomains(); | |
1491 | cfg80211_regdomain = rd; | |
1492 | return 0; | |
1493 | } | |
1494 | ||
1495 | /* For a driver hint, lets copy the regulatory domain the | |
1496 | * driver wanted to the wiphy to deal with conflicts */ | |
1497 | ||
1498 | BUG_ON(last_request->wiphy->regd); | |
1499 | ||
1500 | r = reg_copy_regd(&last_request->wiphy->regd, rd); | |
1501 | if (r) | |
1502 | return r; | |
1503 | ||
b8295acd LR |
1504 | reset_regdomains(); |
1505 | cfg80211_regdomain = rd; | |
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | /* Intersection requires a bit more work */ | |
1510 | ||
1511 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
1512 | ||
9c96477d LR |
1513 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
1514 | if (!intersected_rd) | |
1515 | return -EINVAL; | |
b8295acd | 1516 | |
3e0c3ff3 LR |
1517 | /* We can trash what CRDA provided now. |
1518 | * However if a driver requested this specific regulatory | |
1519 | * domain we keep it for its private use */ | |
1520 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) | |
1521 | last_request->wiphy->regd = rd; | |
1522 | else | |
1523 | kfree(rd); | |
1524 | ||
b8295acd LR |
1525 | rd = NULL; |
1526 | ||
1527 | reset_regdomains(); | |
1528 | cfg80211_regdomain = intersected_rd; | |
1529 | ||
1530 | return 0; | |
9c96477d LR |
1531 | } |
1532 | ||
3f2355cb LR |
1533 | /* |
1534 | * Country IE requests are handled a bit differently, we intersect | |
1535 | * the country IE rd with what CRDA believes that country should have | |
1536 | */ | |
1537 | ||
1538 | BUG_ON(!country_ie_regdomain); | |
1539 | ||
1540 | if (rd != country_ie_regdomain) { | |
1541 | /* Intersect what CRDA returned and our what we | |
1542 | * had built from the Country IE received */ | |
1543 | ||
1544 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); | |
1545 | ||
1546 | reg_country_ie_process_debug(rd, country_ie_regdomain, | |
1547 | intersected_rd); | |
1548 | ||
1549 | kfree(country_ie_regdomain); | |
1550 | country_ie_regdomain = NULL; | |
1551 | } else { | |
1552 | /* This would happen when CRDA was not present and | |
1553 | * OLD_REGULATORY was enabled. We intersect our Country | |
1554 | * IE rd and what was set on cfg80211 originally */ | |
1555 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); | |
1556 | } | |
1557 | ||
1558 | if (!intersected_rd) | |
1559 | return -EINVAL; | |
1560 | ||
1561 | drv = wiphy_to_dev(wiphy); | |
1562 | ||
1563 | drv->country_ie_alpha2[0] = rd->alpha2[0]; | |
1564 | drv->country_ie_alpha2[1] = rd->alpha2[1]; | |
1565 | drv->env = last_request->country_ie_env; | |
1566 | ||
1567 | BUG_ON(intersected_rd == rd); | |
1568 | ||
1569 | kfree(rd); | |
1570 | rd = NULL; | |
1571 | ||
b8295acd | 1572 | reset_regdomains(); |
3f2355cb | 1573 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
1574 | |
1575 | return 0; | |
1576 | } | |
1577 | ||
1578 | ||
1579 | /* Use this call to set the current regulatory domain. Conflicts with | |
1580 | * multiple drivers can be ironed out later. Caller must've already | |
a1794390 | 1581 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex */ |
a3d2eaf0 | 1582 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1583 | { |
b2e1b302 LR |
1584 | int r; |
1585 | ||
b2e1b302 LR |
1586 | /* Note that this doesn't update the wiphys, this is done below */ |
1587 | r = __set_regdom(rd); | |
d2372b31 JB |
1588 | if (r) { |
1589 | kfree(rd); | |
b2e1b302 | 1590 | return r; |
d2372b31 | 1591 | } |
b2e1b302 | 1592 | |
b2e1b302 | 1593 | /* This would make this whole thing pointless */ |
a01ddafd LR |
1594 | if (!last_request->intersect) |
1595 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
1596 | |
1597 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 1598 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 1599 | |
a01ddafd | 1600 | print_regdomain(cfg80211_regdomain); |
b2e1b302 LR |
1601 | |
1602 | return r; | |
1603 | } | |
1604 | ||
a1794390 | 1605 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
1606 | void reg_device_remove(struct wiphy *wiphy) |
1607 | { | |
3e0c3ff3 | 1608 | kfree(wiphy->regd); |
4a4f4d80 | 1609 | if (!last_request || !last_request->wiphy) |
3f2355cb LR |
1610 | return; |
1611 | if (last_request->wiphy != wiphy) | |
1612 | return; | |
1613 | last_request->wiphy = NULL; | |
1614 | last_request->country_ie_env = ENVIRON_ANY; | |
1615 | } | |
1616 | ||
b2e1b302 LR |
1617 | int regulatory_init(void) |
1618 | { | |
734366de JB |
1619 | int err; |
1620 | ||
b2e1b302 LR |
1621 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
1622 | if (IS_ERR(reg_pdev)) | |
1623 | return PTR_ERR(reg_pdev); | |
734366de JB |
1624 | |
1625 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
a3d2eaf0 | 1626 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 1627 | |
942b25cf | 1628 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de JB |
1629 | print_regdomain_info(cfg80211_regdomain); |
1630 | /* The old code still requests for a new regdomain and if | |
1631 | * you have CRDA you get it updated, otherwise you get | |
1632 | * stuck with the static values. We ignore "EU" code as | |
1633 | * that is not a valid ISO / IEC 3166 alpha2 */ | |
ac9440a4 | 1634 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') |
ba25c141 | 1635 | err = regulatory_hint_core(ieee80211_regdom); |
734366de | 1636 | #else |
a3d2eaf0 | 1637 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 1638 | |
ba25c141 LR |
1639 | err = regulatory_hint_core("00"); |
1640 | if (err) { | |
734366de JB |
1641 | printk(KERN_ERR "cfg80211: calling CRDA failed - " |
1642 | "unable to update world regulatory domain, " | |
1643 | "using static definition\n"); | |
ba25c141 | 1644 | } |
734366de JB |
1645 | #endif |
1646 | ||
b2e1b302 LR |
1647 | return 0; |
1648 | } | |
1649 | ||
1650 | void regulatory_exit(void) | |
1651 | { | |
a1794390 | 1652 | mutex_lock(&cfg80211_mutex); |
734366de | 1653 | |
b2e1b302 | 1654 | reset_regdomains(); |
734366de | 1655 | |
3f2355cb LR |
1656 | kfree(country_ie_regdomain); |
1657 | country_ie_regdomain = NULL; | |
1658 | ||
f6037d09 JB |
1659 | kfree(last_request); |
1660 | ||
b2e1b302 | 1661 | platform_device_unregister(reg_pdev); |
734366de | 1662 | |
a1794390 | 1663 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 1664 | } |