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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 | 278 | { |
761cf7ec LR |
279 | assert_cfg80211_lock(); |
280 | ||
b2e1b302 LR |
281 | if (!cfg80211_regdomain) |
282 | return true; | |
283 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
284 | return false; | |
285 | return true; | |
286 | } | |
287 | ||
3f2355cb LR |
288 | /** |
289 | * country_ie_integrity_changes - tells us if the country IE has changed | |
290 | * @checksum: checksum of country IE of fields we are interested in | |
291 | * | |
292 | * If the country IE has not changed you can ignore it safely. This is | |
293 | * useful to determine if two devices are seeing two different country IEs | |
294 | * even on the same alpha2. Note that this will return false if no IE has | |
295 | * been set on the wireless core yet. | |
296 | */ | |
297 | static bool country_ie_integrity_changes(u32 checksum) | |
298 | { | |
299 | /* If no IE has been set then the checksum doesn't change */ | |
300 | if (unlikely(!last_request->country_ie_checksum)) | |
301 | return false; | |
302 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
303 | return true; | |
304 | return false; | |
305 | } | |
306 | ||
b2e1b302 LR |
307 | /* This lets us keep regulatory code which is updated on a regulatory |
308 | * basis in userspace. */ | |
309 | static int call_crda(const char *alpha2) | |
310 | { | |
311 | char country_env[9 + 2] = "COUNTRY="; | |
312 | char *envp[] = { | |
313 | country_env, | |
314 | NULL | |
315 | }; | |
316 | ||
317 | if (!is_world_regdom((char *) alpha2)) | |
318 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
319 | alpha2[0], alpha2[1]); | |
320 | else | |
b2e1b302 LR |
321 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
322 | "regulatory domain\n"); | |
b2e1b302 LR |
323 | |
324 | country_env[8] = alpha2[0]; | |
325 | country_env[9] = alpha2[1]; | |
326 | ||
327 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
328 | } | |
329 | ||
b2e1b302 | 330 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 331 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 332 | { |
f6037d09 JB |
333 | if (!last_request) |
334 | return false; | |
335 | ||
336 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 337 | } |
8318d78a | 338 | |
b2e1b302 | 339 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 340 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 341 | { |
a3d2eaf0 | 342 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
343 | u32 freq_diff; |
344 | ||
91e99004 | 345 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
346 | return false; |
347 | ||
348 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
349 | return false; | |
350 | ||
351 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
352 | ||
d71aaf60 | 353 | if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff) |
b2e1b302 LR |
354 | return false; |
355 | ||
356 | return true; | |
357 | } | |
358 | ||
a3d2eaf0 | 359 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 360 | { |
a3d2eaf0 | 361 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 362 | unsigned int i; |
8318d78a | 363 | |
b2e1b302 LR |
364 | if (!rd->n_reg_rules) |
365 | return false; | |
8318d78a | 366 | |
88dc1c3f LR |
367 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
368 | return false; | |
369 | ||
b2e1b302 LR |
370 | for (i = 0; i < rd->n_reg_rules; i++) { |
371 | reg_rule = &rd->reg_rules[i]; | |
372 | if (!is_valid_reg_rule(reg_rule)) | |
373 | return false; | |
374 | } | |
375 | ||
376 | return true; | |
8318d78a JB |
377 | } |
378 | ||
b2e1b302 LR |
379 | /* Returns value in KHz */ |
380 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
381 | u32 freq) | |
382 | { | |
383 | unsigned int i; | |
384 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
385 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
386 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
387 | if (start_freq_khz >= freq_range->start_freq_khz && | |
388 | end_freq_khz <= freq_range->end_freq_khz) | |
389 | return supported_bandwidths[i]; | |
390 | } | |
391 | return 0; | |
392 | } | |
8318d78a | 393 | |
0c7dc45d LR |
394 | /** |
395 | * freq_in_rule_band - tells us if a frequency is in a frequency band | |
396 | * @freq_range: frequency rule we want to query | |
397 | * @freq_khz: frequency we are inquiring about | |
398 | * | |
399 | * This lets us know if a specific frequency rule is or is not relevant to | |
400 | * a specific frequency's band. Bands are device specific and artificial | |
401 | * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is | |
402 | * safe for now to assume that a frequency rule should not be part of a | |
403 | * frequency's band if the start freq or end freq are off by more than 2 GHz. | |
404 | * This resolution can be lowered and should be considered as we add | |
405 | * regulatory rule support for other "bands". | |
406 | **/ | |
407 | static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, | |
408 | u32 freq_khz) | |
409 | { | |
410 | #define ONE_GHZ_IN_KHZ 1000000 | |
411 | if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
412 | return true; | |
413 | if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ)) | |
414 | return true; | |
415 | return false; | |
416 | #undef ONE_GHZ_IN_KHZ | |
417 | } | |
418 | ||
3f2355cb LR |
419 | /* Converts a country IE to a regulatory domain. A regulatory domain |
420 | * structure has a lot of information which the IE doesn't yet have, | |
421 | * so for the other values we use upper max values as we will intersect | |
422 | * with our userspace regulatory agent to get lower bounds. */ | |
423 | static struct ieee80211_regdomain *country_ie_2_rd( | |
424 | u8 *country_ie, | |
425 | u8 country_ie_len, | |
426 | u32 *checksum) | |
427 | { | |
428 | struct ieee80211_regdomain *rd = NULL; | |
429 | unsigned int i = 0; | |
430 | char alpha2[2]; | |
431 | u32 flags = 0; | |
432 | u32 num_rules = 0, size_of_regd = 0; | |
433 | u8 *triplets_start = NULL; | |
434 | u8 len_at_triplet = 0; | |
435 | /* the last channel we have registered in a subband (triplet) */ | |
436 | int last_sub_max_channel = 0; | |
437 | ||
438 | *checksum = 0xDEADBEEF; | |
439 | ||
440 | /* Country IE requirements */ | |
441 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
442 | country_ie_len & 0x01); | |
443 | ||
444 | alpha2[0] = country_ie[0]; | |
445 | alpha2[1] = country_ie[1]; | |
446 | ||
447 | /* | |
448 | * Third octet can be: | |
449 | * 'I' - Indoor | |
450 | * 'O' - Outdoor | |
451 | * | |
452 | * anything else we assume is no restrictions | |
453 | */ | |
454 | if (country_ie[2] == 'I') | |
455 | flags = NL80211_RRF_NO_OUTDOOR; | |
456 | else if (country_ie[2] == 'O') | |
457 | flags = NL80211_RRF_NO_INDOOR; | |
458 | ||
459 | country_ie += 3; | |
460 | country_ie_len -= 3; | |
461 | ||
462 | triplets_start = country_ie; | |
463 | len_at_triplet = country_ie_len; | |
464 | ||
465 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
466 | ||
467 | /* We need to build a reg rule for each triplet, but first we must | |
468 | * calculate the number of reg rules we will need. We will need one | |
469 | * for each channel subband */ | |
470 | while (country_ie_len >= 3) { | |
615aab4b | 471 | int end_channel = 0; |
3f2355cb LR |
472 | struct ieee80211_country_ie_triplet *triplet = |
473 | (struct ieee80211_country_ie_triplet *) country_ie; | |
474 | int cur_sub_max_channel = 0, cur_channel = 0; | |
475 | ||
476 | if (triplet->ext.reg_extension_id >= | |
477 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
478 | country_ie += 3; | |
479 | country_ie_len -= 3; | |
480 | continue; | |
481 | } | |
482 | ||
615aab4b LR |
483 | /* 2 GHz */ |
484 | if (triplet->chans.first_channel <= 14) | |
485 | end_channel = triplet->chans.first_channel + | |
486 | triplet->chans.num_channels; | |
487 | else | |
488 | /* | |
489 | * 5 GHz -- For example in country IEs if the first | |
490 | * channel given is 36 and the number of channels is 4 | |
491 | * then the individual channel numbers defined for the | |
492 | * 5 GHz PHY by these parameters are: 36, 40, 44, and 48 | |
493 | * and not 36, 37, 38, 39. | |
494 | * | |
495 | * See: http://tinyurl.com/11d-clarification | |
496 | */ | |
497 | end_channel = triplet->chans.first_channel + | |
498 | (4 * (triplet->chans.num_channels - 1)); | |
499 | ||
3f2355cb | 500 | cur_channel = triplet->chans.first_channel; |
615aab4b | 501 | cur_sub_max_channel = end_channel; |
3f2355cb LR |
502 | |
503 | /* Basic sanity check */ | |
504 | if (cur_sub_max_channel < cur_channel) | |
505 | return NULL; | |
506 | ||
507 | /* Do not allow overlapping channels. Also channels | |
508 | * passed in each subband must be monotonically | |
509 | * increasing */ | |
510 | if (last_sub_max_channel) { | |
511 | if (cur_channel <= last_sub_max_channel) | |
512 | return NULL; | |
513 | if (cur_sub_max_channel <= last_sub_max_channel) | |
514 | return NULL; | |
515 | } | |
516 | ||
517 | /* When dot11RegulatoryClassesRequired is supported | |
518 | * we can throw ext triplets as part of this soup, | |
519 | * for now we don't care when those change as we | |
520 | * don't support them */ | |
521 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | | |
522 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
523 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
524 | ||
525 | last_sub_max_channel = cur_sub_max_channel; | |
526 | ||
527 | country_ie += 3; | |
528 | country_ie_len -= 3; | |
529 | num_rules++; | |
530 | ||
531 | /* Note: this is not a IEEE requirement but | |
532 | * simply a memory requirement */ | |
533 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) | |
534 | return NULL; | |
535 | } | |
536 | ||
537 | country_ie = triplets_start; | |
538 | country_ie_len = len_at_triplet; | |
539 | ||
540 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
541 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
542 | ||
543 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
544 | if (!rd) | |
545 | return NULL; | |
546 | ||
547 | rd->n_reg_rules = num_rules; | |
548 | rd->alpha2[0] = alpha2[0]; | |
549 | rd->alpha2[1] = alpha2[1]; | |
550 | ||
551 | /* This time around we fill in the rd */ | |
552 | while (country_ie_len >= 3) { | |
02e68a3d | 553 | int end_channel = 0; |
3f2355cb LR |
554 | struct ieee80211_country_ie_triplet *triplet = |
555 | (struct ieee80211_country_ie_triplet *) country_ie; | |
556 | struct ieee80211_reg_rule *reg_rule = NULL; | |
557 | struct ieee80211_freq_range *freq_range = NULL; | |
558 | struct ieee80211_power_rule *power_rule = NULL; | |
559 | ||
560 | /* Must parse if dot11RegulatoryClassesRequired is true, | |
561 | * we don't support this yet */ | |
562 | if (triplet->ext.reg_extension_id >= | |
563 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
564 | country_ie += 3; | |
565 | country_ie_len -= 3; | |
566 | continue; | |
567 | } | |
568 | ||
569 | reg_rule = &rd->reg_rules[i]; | |
570 | freq_range = ®_rule->freq_range; | |
571 | power_rule = ®_rule->power_rule; | |
572 | ||
573 | reg_rule->flags = flags; | |
574 | ||
02e68a3d LR |
575 | /* 2 GHz */ |
576 | if (triplet->chans.first_channel <= 14) | |
577 | end_channel = triplet->chans.first_channel + | |
578 | triplet->chans.num_channels; | |
579 | else | |
02e68a3d LR |
580 | end_channel = triplet->chans.first_channel + |
581 | (4 * (triplet->chans.num_channels - 1)); | |
582 | ||
3f2355cb LR |
583 | /* The +10 is since the regulatory domain expects |
584 | * the actual band edge, not the center of freq for | |
585 | * its start and end freqs, assuming 20 MHz bandwidth on | |
586 | * the channels passed */ | |
587 | freq_range->start_freq_khz = | |
588 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
589 | triplet->chans.first_channel) - 10); | |
590 | freq_range->end_freq_khz = | |
591 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
02e68a3d | 592 | end_channel) + 10); |
3f2355cb LR |
593 | |
594 | /* Large arbitrary values, we intersect later */ | |
595 | /* Increment this if we ever support >= 40 MHz channels | |
596 | * in IEEE 802.11 */ | |
597 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); | |
598 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
599 | power_rule->max_eirp = DBM_TO_MBM(100); | |
600 | ||
601 | country_ie += 3; | |
602 | country_ie_len -= 3; | |
603 | i++; | |
604 | ||
605 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
606 | } | |
607 | ||
608 | return rd; | |
609 | } | |
610 | ||
611 | ||
9c96477d LR |
612 | /* Helper for regdom_intersect(), this does the real |
613 | * mathematical intersection fun */ | |
614 | static int reg_rules_intersect( | |
615 | const struct ieee80211_reg_rule *rule1, | |
616 | const struct ieee80211_reg_rule *rule2, | |
617 | struct ieee80211_reg_rule *intersected_rule) | |
618 | { | |
619 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
620 | struct ieee80211_freq_range *freq_range; | |
621 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
622 | struct ieee80211_power_rule *power_rule; | |
623 | u32 freq_diff; | |
624 | ||
625 | freq_range1 = &rule1->freq_range; | |
626 | freq_range2 = &rule2->freq_range; | |
627 | freq_range = &intersected_rule->freq_range; | |
628 | ||
629 | power_rule1 = &rule1->power_rule; | |
630 | power_rule2 = &rule2->power_rule; | |
631 | power_rule = &intersected_rule->power_rule; | |
632 | ||
633 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
634 | freq_range2->start_freq_khz); | |
635 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
636 | freq_range2->end_freq_khz); | |
637 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
638 | freq_range2->max_bandwidth_khz); | |
639 | ||
640 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
641 | if (freq_range->max_bandwidth_khz > freq_diff) | |
642 | freq_range->max_bandwidth_khz = freq_diff; | |
643 | ||
644 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
645 | power_rule2->max_eirp); | |
646 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
647 | power_rule2->max_antenna_gain); | |
648 | ||
649 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
650 | ||
651 | if (!is_valid_reg_rule(intersected_rule)) | |
652 | return -EINVAL; | |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
657 | /** | |
658 | * regdom_intersect - do the intersection between two regulatory domains | |
659 | * @rd1: first regulatory domain | |
660 | * @rd2: second regulatory domain | |
661 | * | |
662 | * Use this function to get the intersection between two regulatory domains. | |
663 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
664 | * as no one single alpha2 can represent this regulatory domain. | |
665 | * | |
666 | * Returns a pointer to the regulatory domain structure which will hold the | |
667 | * resulting intersection of rules between rd1 and rd2. We will | |
668 | * kzalloc() this structure for you. | |
669 | */ | |
670 | static struct ieee80211_regdomain *regdom_intersect( | |
671 | const struct ieee80211_regdomain *rd1, | |
672 | const struct ieee80211_regdomain *rd2) | |
673 | { | |
674 | int r, size_of_regd; | |
675 | unsigned int x, y; | |
676 | unsigned int num_rules = 0, rule_idx = 0; | |
677 | const struct ieee80211_reg_rule *rule1, *rule2; | |
678 | struct ieee80211_reg_rule *intersected_rule; | |
679 | struct ieee80211_regdomain *rd; | |
680 | /* This is just a dummy holder to help us count */ | |
681 | struct ieee80211_reg_rule irule; | |
682 | ||
683 | /* Uses the stack temporarily for counter arithmetic */ | |
684 | intersected_rule = &irule; | |
685 | ||
686 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
687 | ||
688 | if (!rd1 || !rd2) | |
689 | return NULL; | |
690 | ||
691 | /* First we get a count of the rules we'll need, then we actually | |
692 | * build them. This is to so we can malloc() and free() a | |
693 | * regdomain once. The reason we use reg_rules_intersect() here | |
694 | * is it will return -EINVAL if the rule computed makes no sense. | |
695 | * All rules that do check out OK are valid. */ | |
696 | ||
697 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
698 | rule1 = &rd1->reg_rules[x]; | |
699 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
700 | rule2 = &rd2->reg_rules[y]; | |
701 | if (!reg_rules_intersect(rule1, rule2, | |
702 | intersected_rule)) | |
703 | num_rules++; | |
704 | memset(intersected_rule, 0, | |
705 | sizeof(struct ieee80211_reg_rule)); | |
706 | } | |
707 | } | |
708 | ||
709 | if (!num_rules) | |
710 | return NULL; | |
711 | ||
712 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
713 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
714 | ||
715 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
716 | if (!rd) | |
717 | return NULL; | |
718 | ||
719 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
720 | rule1 = &rd1->reg_rules[x]; | |
721 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
722 | rule2 = &rd2->reg_rules[y]; | |
723 | /* This time around instead of using the stack lets | |
724 | * write to the target rule directly saving ourselves | |
725 | * a memcpy() */ | |
726 | intersected_rule = &rd->reg_rules[rule_idx]; | |
727 | r = reg_rules_intersect(rule1, rule2, | |
728 | intersected_rule); | |
729 | /* No need to memset here the intersected rule here as | |
730 | * we're not using the stack anymore */ | |
731 | if (r) | |
732 | continue; | |
733 | rule_idx++; | |
734 | } | |
735 | } | |
736 | ||
737 | if (rule_idx != num_rules) { | |
738 | kfree(rd); | |
739 | return NULL; | |
740 | } | |
741 | ||
742 | rd->n_reg_rules = num_rules; | |
743 | rd->alpha2[0] = '9'; | |
744 | rd->alpha2[1] = '8'; | |
745 | ||
746 | return rd; | |
747 | } | |
748 | ||
b2e1b302 LR |
749 | /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may |
750 | * want to just have the channel structure use these */ | |
751 | static u32 map_regdom_flags(u32 rd_flags) | |
752 | { | |
753 | u32 channel_flags = 0; | |
754 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
755 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
756 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
757 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
758 | if (rd_flags & NL80211_RRF_DFS) | |
759 | channel_flags |= IEEE80211_CHAN_RADAR; | |
760 | return channel_flags; | |
761 | } | |
762 | ||
1fa25e41 LR |
763 | static int freq_reg_info_regd(struct wiphy *wiphy, |
764 | u32 center_freq, | |
765 | u32 *bandwidth, | |
766 | const struct ieee80211_reg_rule **reg_rule, | |
767 | const struct ieee80211_regdomain *custom_regd) | |
8318d78a JB |
768 | { |
769 | int i; | |
0c7dc45d | 770 | bool band_rule_found = false; |
3e0c3ff3 | 771 | const struct ieee80211_regdomain *regd; |
b2e1b302 | 772 | u32 max_bandwidth = 0; |
8318d78a | 773 | |
1fa25e41 | 774 | regd = custom_regd ? custom_regd : cfg80211_regdomain; |
3e0c3ff3 LR |
775 | |
776 | /* Follow the driver's regulatory domain, if present, unless a country | |
24ed1da1 | 777 | * IE has been processed or a user wants to help complaince further */ |
3e0c3ff3 | 778 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE && |
24ed1da1 | 779 | last_request->initiator != REGDOM_SET_BY_USER && |
3e0c3ff3 LR |
780 | wiphy->regd) |
781 | regd = wiphy->regd; | |
782 | ||
783 | if (!regd) | |
b2e1b302 LR |
784 | return -EINVAL; |
785 | ||
3e0c3ff3 | 786 | for (i = 0; i < regd->n_reg_rules; i++) { |
b2e1b302 LR |
787 | const struct ieee80211_reg_rule *rr; |
788 | const struct ieee80211_freq_range *fr = NULL; | |
789 | const struct ieee80211_power_rule *pr = NULL; | |
790 | ||
3e0c3ff3 | 791 | rr = ®d->reg_rules[i]; |
b2e1b302 LR |
792 | fr = &rr->freq_range; |
793 | pr = &rr->power_rule; | |
0c7dc45d LR |
794 | |
795 | /* We only need to know if one frequency rule was | |
796 | * was in center_freq's band, that's enough, so lets | |
797 | * not overwrite it once found */ | |
798 | if (!band_rule_found) | |
799 | band_rule_found = freq_in_rule_band(fr, center_freq); | |
800 | ||
b2e1b302 | 801 | max_bandwidth = freq_max_bandwidth(fr, center_freq); |
0c7dc45d | 802 | |
b2e1b302 LR |
803 | if (max_bandwidth && *bandwidth <= max_bandwidth) { |
804 | *reg_rule = rr; | |
805 | *bandwidth = max_bandwidth; | |
8318d78a JB |
806 | break; |
807 | } | |
808 | } | |
809 | ||
0c7dc45d LR |
810 | if (!band_rule_found) |
811 | return -ERANGE; | |
812 | ||
b2e1b302 LR |
813 | return !max_bandwidth; |
814 | } | |
34f57347 | 815 | EXPORT_SYMBOL(freq_reg_info); |
b2e1b302 | 816 | |
34f57347 | 817 | int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth, |
1fa25e41 LR |
818 | const struct ieee80211_reg_rule **reg_rule) |
819 | { | |
820 | return freq_reg_info_regd(wiphy, center_freq, | |
821 | bandwidth, reg_rule, NULL); | |
822 | } | |
b2e1b302 | 823 | |
a92a3ce7 LR |
824 | static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, |
825 | unsigned int chan_idx) | |
b2e1b302 LR |
826 | { |
827 | int r; | |
a92a3ce7 | 828 | u32 flags; |
b2e1b302 LR |
829 | u32 max_bandwidth = 0; |
830 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
831 | const struct ieee80211_power_rule *power_rule = NULL; | |
a92a3ce7 LR |
832 | struct ieee80211_supported_band *sband; |
833 | struct ieee80211_channel *chan; | |
834 | ||
761cf7ec LR |
835 | assert_cfg80211_lock(); |
836 | ||
a92a3ce7 LR |
837 | sband = wiphy->bands[band]; |
838 | BUG_ON(chan_idx >= sband->n_channels); | |
839 | chan = &sband->channels[chan_idx]; | |
840 | ||
841 | flags = chan->orig_flags; | |
b2e1b302 | 842 | |
3e0c3ff3 | 843 | r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq), |
b2e1b302 LR |
844 | &max_bandwidth, ®_rule); |
845 | ||
846 | if (r) { | |
0c7dc45d LR |
847 | /* This means no regulatory rule was found in the country IE |
848 | * with a frequency range on the center_freq's band, since | |
849 | * IEEE-802.11 allows for a country IE to have a subset of the | |
850 | * regulatory information provided in a country we ignore | |
851 | * disabling the channel unless at least one reg rule was | |
852 | * found on the center_freq's band. For details see this | |
853 | * clarification: | |
854 | * | |
855 | * http://tinyurl.com/11d-clarification | |
856 | */ | |
857 | if (r == -ERANGE && | |
858 | last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
859 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
860 | printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz " | |
861 | "intact on %s - no rule found in band on " | |
862 | "Country IE\n", | |
863 | chan->center_freq, wiphy_name(wiphy)); | |
864 | #endif | |
865 | } else { | |
866 | /* In this case we know the country IE has at least one reg rule | |
867 | * for the band so we respect its band definitions */ | |
868 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
869 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
870 | printk(KERN_DEBUG "cfg80211: Disabling " | |
871 | "channel %d MHz on %s due to " | |
872 | "Country IE\n", | |
873 | chan->center_freq, wiphy_name(wiphy)); | |
874 | #endif | |
875 | flags |= IEEE80211_CHAN_DISABLED; | |
876 | chan->flags = flags; | |
877 | } | |
8318d78a JB |
878 | return; |
879 | } | |
880 | ||
b2e1b302 LR |
881 | power_rule = ®_rule->power_rule; |
882 | ||
f976376d LR |
883 | if (last_request->initiator == REGDOM_SET_BY_DRIVER && |
884 | last_request->wiphy && last_request->wiphy == wiphy && | |
885 | last_request->wiphy->strict_regulatory) { | |
886 | /* This gaurantees the driver's requested regulatory domain | |
887 | * will always be used as a base for further regulatory | |
888 | * settings */ | |
889 | chan->flags = chan->orig_flags = | |
890 | map_regdom_flags(reg_rule->flags); | |
891 | chan->max_antenna_gain = chan->orig_mag = | |
892 | (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
893 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
894 | chan->max_power = chan->orig_mpwr = | |
895 | (int) MBM_TO_DBM(power_rule->max_eirp); | |
896 | return; | |
897 | } | |
898 | ||
b2e1b302 | 899 | chan->flags = flags | map_regdom_flags(reg_rule->flags); |
8318d78a | 900 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
901 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
902 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 903 | if (chan->orig_mpwr) |
b2e1b302 LR |
904 | chan->max_power = min(chan->orig_mpwr, |
905 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 906 | else |
b2e1b302 | 907 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
908 | } |
909 | ||
a92a3ce7 | 910 | static void handle_band(struct wiphy *wiphy, enum ieee80211_band band) |
8318d78a | 911 | { |
a92a3ce7 LR |
912 | unsigned int i; |
913 | struct ieee80211_supported_band *sband; | |
914 | ||
915 | BUG_ON(!wiphy->bands[band]); | |
916 | sband = wiphy->bands[band]; | |
8318d78a JB |
917 | |
918 | for (i = 0; i < sband->n_channels; i++) | |
a92a3ce7 | 919 | handle_channel(wiphy, band, i); |
8318d78a JB |
920 | } |
921 | ||
14b9815a LR |
922 | static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby) |
923 | { | |
924 | if (!last_request) | |
925 | return true; | |
926 | if (setby == REGDOM_SET_BY_CORE && | |
2a44f911 | 927 | wiphy->custom_regulatory) |
14b9815a | 928 | return true; |
f976376d LR |
929 | /* wiphy->regd will be set once the device has its own |
930 | * desired regulatory domain set */ | |
931 | if (wiphy->strict_regulatory && !wiphy->regd && | |
932 | !is_world_regdom(last_request->alpha2)) | |
14b9815a LR |
933 | return true; |
934 | return false; | |
935 | } | |
936 | ||
b2e1b302 | 937 | static void update_all_wiphy_regulatory(enum reg_set_by setby) |
8318d78a | 938 | { |
b2e1b302 | 939 | struct cfg80211_registered_device *drv; |
8318d78a | 940 | |
b2e1b302 | 941 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
d46e5b1d | 942 | wiphy_update_regulatory(&drv->wiphy, setby); |
b2e1b302 LR |
943 | } |
944 | ||
945 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
946 | { | |
947 | enum ieee80211_band band; | |
d46e5b1d LR |
948 | |
949 | if (ignore_reg_update(wiphy, setby)) | |
950 | return; | |
b2e1b302 | 951 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
8318d78a | 952 | if (wiphy->bands[band]) |
a92a3ce7 | 953 | handle_band(wiphy, band); |
b2e1b302 | 954 | } |
560e28e1 | 955 | if (wiphy->reg_notifier) |
716f9392 | 956 | wiphy->reg_notifier(wiphy, last_request); |
b2e1b302 LR |
957 | } |
958 | ||
1fa25e41 LR |
959 | static void handle_channel_custom(struct wiphy *wiphy, |
960 | enum ieee80211_band band, | |
961 | unsigned int chan_idx, | |
962 | const struct ieee80211_regdomain *regd) | |
963 | { | |
964 | int r; | |
965 | u32 max_bandwidth = 0; | |
966 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
967 | const struct ieee80211_power_rule *power_rule = NULL; | |
968 | struct ieee80211_supported_band *sband; | |
969 | struct ieee80211_channel *chan; | |
970 | ||
971 | sband = wiphy->bands[band]; | |
972 | BUG_ON(chan_idx >= sband->n_channels); | |
973 | chan = &sband->channels[chan_idx]; | |
974 | ||
975 | r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq), | |
976 | &max_bandwidth, ®_rule, regd); | |
977 | ||
978 | if (r) { | |
979 | chan->flags = IEEE80211_CHAN_DISABLED; | |
980 | return; | |
981 | } | |
982 | ||
983 | power_rule = ®_rule->power_rule; | |
984 | ||
985 | chan->flags |= map_regdom_flags(reg_rule->flags); | |
986 | chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); | |
987 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
988 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
989 | } | |
990 | ||
991 | static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, | |
992 | const struct ieee80211_regdomain *regd) | |
993 | { | |
994 | unsigned int i; | |
995 | struct ieee80211_supported_band *sband; | |
996 | ||
997 | BUG_ON(!wiphy->bands[band]); | |
998 | sband = wiphy->bands[band]; | |
999 | ||
1000 | for (i = 0; i < sband->n_channels; i++) | |
1001 | handle_channel_custom(wiphy, band, i, regd); | |
1002 | } | |
1003 | ||
1004 | /* Used by drivers prior to wiphy registration */ | |
1005 | void wiphy_apply_custom_regulatory(struct wiphy *wiphy, | |
1006 | const struct ieee80211_regdomain *regd) | |
1007 | { | |
1008 | enum ieee80211_band band; | |
1009 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1010 | if (wiphy->bands[band]) | |
1011 | handle_band_custom(wiphy, band, regd); | |
b2e1b302 LR |
1012 | } |
1013 | } | |
1fa25e41 LR |
1014 | EXPORT_SYMBOL(wiphy_apply_custom_regulatory); |
1015 | ||
3e0c3ff3 LR |
1016 | static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, |
1017 | const struct ieee80211_regdomain *src_regd) | |
1018 | { | |
1019 | struct ieee80211_regdomain *regd; | |
1020 | int size_of_regd = 0; | |
1021 | unsigned int i; | |
1022 | ||
1023 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
1024 | ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
1025 | ||
1026 | regd = kzalloc(size_of_regd, GFP_KERNEL); | |
1027 | if (!regd) | |
1028 | return -ENOMEM; | |
1029 | ||
1030 | memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); | |
1031 | ||
1032 | for (i = 0; i < src_regd->n_reg_rules; i++) | |
1033 | memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], | |
1034 | sizeof(struct ieee80211_reg_rule)); | |
1035 | ||
1036 | *dst_regd = regd; | |
1037 | return 0; | |
1038 | } | |
b2e1b302 | 1039 | |
9c96477d LR |
1040 | /* Return value which can be used by ignore_request() to indicate |
1041 | * it has been determined we should intersect two regulatory domains */ | |
1042 | #define REG_INTERSECT 1 | |
1043 | ||
84fa4f43 JB |
1044 | /* This has the logic which determines when a new request |
1045 | * should be ignored. */ | |
1046 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
1047 | const char *alpha2) | |
1048 | { | |
761cf7ec LR |
1049 | |
1050 | assert_cfg80211_lock(); | |
1051 | ||
84fa4f43 JB |
1052 | /* All initial requests are respected */ |
1053 | if (!last_request) | |
1054 | return 0; | |
1055 | ||
1056 | switch (set_by) { | |
1057 | case REGDOM_SET_BY_INIT: | |
1058 | return -EINVAL; | |
1059 | case REGDOM_SET_BY_CORE: | |
ba25c141 | 1060 | return -EINVAL; |
84fa4f43 JB |
1061 | case REGDOM_SET_BY_COUNTRY_IE: |
1062 | if (unlikely(!is_an_alpha2(alpha2))) | |
1063 | return -EINVAL; | |
1064 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
1065 | if (last_request->wiphy != wiphy) { | |
1066 | /* | |
1067 | * Two cards with two APs claiming different | |
1068 | * different Country IE alpha2s. We could | |
1069 | * intersect them, but that seems unlikely | |
1070 | * to be correct. Reject second one for now. | |
1071 | */ | |
1072 | if (!alpha2_equal(alpha2, | |
1073 | cfg80211_regdomain->alpha2)) | |
1074 | return -EOPNOTSUPP; | |
1075 | return -EALREADY; | |
1076 | } | |
3f2355cb LR |
1077 | /* Two consecutive Country IE hints on the same wiphy. |
1078 | * This should be picked up early by the driver/stack */ | |
1079 | if (WARN_ON(!alpha2_equal(cfg80211_regdomain->alpha2, | |
1080 | alpha2))) | |
84fa4f43 JB |
1081 | return 0; |
1082 | return -EALREADY; | |
1083 | } | |
3f2355cb | 1084 | return REG_INTERSECT; |
84fa4f43 | 1085 | case REGDOM_SET_BY_DRIVER: |
e74b1e7f LR |
1086 | if (last_request->initiator == REGDOM_SET_BY_CORE) { |
1087 | if (is_old_static_regdom(cfg80211_regdomain)) | |
1088 | return 0; | |
1089 | if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
1090 | return 0; | |
84fa4f43 | 1091 | return -EALREADY; |
e74b1e7f | 1092 | } |
3e0c3ff3 | 1093 | return REG_INTERSECT; |
84fa4f43 | 1094 | case REGDOM_SET_BY_USER: |
84fa4f43 | 1095 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) |
9c96477d | 1096 | return REG_INTERSECT; |
3f2355cb LR |
1097 | /* If the user knows better the user should set the regdom |
1098 | * to their country before the IE is picked up */ | |
1099 | if (last_request->initiator == REGDOM_SET_BY_USER && | |
1100 | last_request->intersect) | |
1101 | return -EOPNOTSUPP; | |
5eebade6 LR |
1102 | /* Process user requests only after previous user/driver/core |
1103 | * requests have been processed */ | |
1104 | if (last_request->initiator == REGDOM_SET_BY_CORE || | |
1105 | last_request->initiator == REGDOM_SET_BY_DRIVER || | |
1106 | last_request->initiator == REGDOM_SET_BY_USER) { | |
1107 | if (!alpha2_equal(last_request->alpha2, | |
1108 | cfg80211_regdomain->alpha2)) | |
1109 | return -EAGAIN; | |
1110 | } | |
1111 | ||
e74b1e7f LR |
1112 | if (!is_old_static_regdom(cfg80211_regdomain) && |
1113 | alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
1114 | return -EALREADY; | |
1115 | ||
84fa4f43 JB |
1116 | return 0; |
1117 | } | |
1118 | ||
1119 | return -EINVAL; | |
1120 | } | |
1121 | ||
a1794390 | 1122 | /* Caller must hold &cfg80211_mutex */ |
b2e1b302 | 1123 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, |
3f2355cb LR |
1124 | const char *alpha2, |
1125 | u32 country_ie_checksum, | |
1126 | enum environment_cap env) | |
b2e1b302 LR |
1127 | { |
1128 | struct regulatory_request *request; | |
9c96477d | 1129 | bool intersect = false; |
b2e1b302 LR |
1130 | int r = 0; |
1131 | ||
761cf7ec LR |
1132 | assert_cfg80211_lock(); |
1133 | ||
be3d4810 | 1134 | r = ignore_request(wiphy, set_by, alpha2); |
9c96477d | 1135 | |
3e0c3ff3 LR |
1136 | if (r == REG_INTERSECT) { |
1137 | if (set_by == REGDOM_SET_BY_DRIVER) { | |
1138 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); | |
1139 | if (r) | |
1140 | return r; | |
1141 | } | |
9c96477d | 1142 | intersect = true; |
3e0c3ff3 LR |
1143 | } else if (r) { |
1144 | /* If the regulatory domain being requested by the | |
1145 | * driver has already been set just copy it to the | |
1146 | * wiphy */ | |
1147 | if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) { | |
1148 | r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain); | |
1149 | if (r) | |
1150 | return r; | |
1151 | r = -EALREADY; | |
1152 | goto new_request; | |
1153 | } | |
b2e1b302 | 1154 | return r; |
3e0c3ff3 | 1155 | } |
b2e1b302 | 1156 | |
3e0c3ff3 | 1157 | new_request: |
5203cdb6 LR |
1158 | request = kzalloc(sizeof(struct regulatory_request), |
1159 | GFP_KERNEL); | |
1160 | if (!request) | |
1161 | return -ENOMEM; | |
1162 | ||
1163 | request->alpha2[0] = alpha2[0]; | |
1164 | request->alpha2[1] = alpha2[1]; | |
1165 | request->initiator = set_by; | |
1166 | request->wiphy = wiphy; | |
1167 | request->intersect = intersect; | |
3f2355cb LR |
1168 | request->country_ie_checksum = country_ie_checksum; |
1169 | request->country_ie_env = env; | |
5203cdb6 LR |
1170 | |
1171 | kfree(last_request); | |
1172 | last_request = request; | |
3e0c3ff3 LR |
1173 | |
1174 | /* When r == REG_INTERSECT we do need to call CRDA */ | |
1175 | if (r < 0) | |
1176 | return r; | |
1177 | ||
3f2355cb LR |
1178 | /* |
1179 | * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled | |
1180 | * AND if CRDA is NOT present nothing will happen, if someone | |
1181 | * wants to bother with 11d with OLD_REG you can add a timer. | |
1182 | * If after x amount of time nothing happens you can call: | |
1183 | * | |
1184 | * return set_regdom(country_ie_regdomain); | |
1185 | * | |
1186 | * to intersect with the static rd | |
1187 | */ | |
02ba0b32 | 1188 | return call_crda(alpha2); |
b2e1b302 LR |
1189 | } |
1190 | ||
ba25c141 LR |
1191 | static int regulatory_hint_core(const char *alpha2) |
1192 | { | |
1193 | struct regulatory_request *request; | |
1194 | ||
1195 | BUG_ON(last_request); | |
1196 | ||
1197 | request = kzalloc(sizeof(struct regulatory_request), | |
1198 | GFP_KERNEL); | |
1199 | if (!request) | |
1200 | return -ENOMEM; | |
1201 | ||
1202 | request->alpha2[0] = alpha2[0]; | |
1203 | request->alpha2[1] = alpha2[1]; | |
1204 | request->initiator = REGDOM_SET_BY_CORE; | |
1205 | ||
1206 | last_request = request; | |
1207 | ||
1208 | return call_crda(alpha2); | |
1209 | } | |
1210 | ||
be3d4810 | 1211 | void regulatory_hint(struct wiphy *wiphy, const char *alpha2) |
b2e1b302 | 1212 | { |
f976376d | 1213 | int r; |
be3d4810 | 1214 | BUG_ON(!alpha2); |
b2e1b302 | 1215 | |
a1794390 | 1216 | mutex_lock(&cfg80211_mutex); |
f976376d LR |
1217 | r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, |
1218 | alpha2, 0, ENVIRON_ANY); | |
1219 | /* This is required so that the orig_* parameters are saved */ | |
1220 | if (r == -EALREADY && wiphy->strict_regulatory) | |
1221 | wiphy_update_regulatory(wiphy, REGDOM_SET_BY_DRIVER); | |
a1794390 | 1222 | mutex_unlock(&cfg80211_mutex); |
b2e1b302 LR |
1223 | } |
1224 | EXPORT_SYMBOL(regulatory_hint); | |
1225 | ||
3f2355cb LR |
1226 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, |
1227 | u32 country_ie_checksum) | |
1228 | { | |
761cf7ec LR |
1229 | assert_cfg80211_lock(); |
1230 | ||
3f2355cb LR |
1231 | if (!last_request->wiphy) |
1232 | return false; | |
1233 | if (likely(last_request->wiphy != wiphy)) | |
1234 | return !country_ie_integrity_changes(country_ie_checksum); | |
1235 | /* We should not have let these through at this point, they | |
1236 | * should have been picked up earlier by the first alpha2 check | |
1237 | * on the device */ | |
1238 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) | |
1239 | return true; | |
1240 | return false; | |
1241 | } | |
1242 | ||
1243 | void regulatory_hint_11d(struct wiphy *wiphy, | |
1244 | u8 *country_ie, | |
1245 | u8 country_ie_len) | |
1246 | { | |
1247 | struct ieee80211_regdomain *rd = NULL; | |
1248 | char alpha2[2]; | |
1249 | u32 checksum = 0; | |
1250 | enum environment_cap env = ENVIRON_ANY; | |
1251 | ||
0f70f398 JB |
1252 | if (!last_request) |
1253 | return; | |
1254 | ||
a1794390 | 1255 | mutex_lock(&cfg80211_mutex); |
3f2355cb LR |
1256 | |
1257 | /* IE len must be evenly divisible by 2 */ | |
1258 | if (country_ie_len & 0x01) | |
1259 | goto out; | |
1260 | ||
1261 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1262 | goto out; | |
1263 | ||
1264 | /* Pending country IE processing, this can happen after we | |
1265 | * call CRDA and wait for a response if a beacon was received before | |
1266 | * we were able to process the last regulatory_hint_11d() call */ | |
1267 | if (country_ie_regdomain) | |
1268 | goto out; | |
1269 | ||
1270 | alpha2[0] = country_ie[0]; | |
1271 | alpha2[1] = country_ie[1]; | |
1272 | ||
1273 | if (country_ie[2] == 'I') | |
1274 | env = ENVIRON_INDOOR; | |
1275 | else if (country_ie[2] == 'O') | |
1276 | env = ENVIRON_OUTDOOR; | |
1277 | ||
1278 | /* We will run this for *every* beacon processed for the BSSID, so | |
1279 | * we optimize an early check to exit out early if we don't have to | |
1280 | * do anything */ | |
1281 | if (likely(last_request->wiphy)) { | |
1282 | struct cfg80211_registered_device *drv_last_ie; | |
1283 | ||
1284 | drv_last_ie = wiphy_to_dev(last_request->wiphy); | |
1285 | ||
1286 | /* Lets keep this simple -- we trust the first AP | |
1287 | * after we intersect with CRDA */ | |
1288 | if (likely(last_request->wiphy == wiphy)) { | |
1289 | /* Ignore IEs coming in on this wiphy with | |
1290 | * the same alpha2 and environment cap */ | |
1291 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, | |
1292 | alpha2) && | |
1293 | env == drv_last_ie->env)) { | |
1294 | goto out; | |
1295 | } | |
1296 | /* the wiphy moved on to another BSSID or the AP | |
1297 | * was reconfigured. XXX: We need to deal with the | |
1298 | * case where the user suspends and goes to goes | |
1299 | * to another country, and then gets IEs from an | |
1300 | * AP with different settings */ | |
1301 | goto out; | |
1302 | } else { | |
1303 | /* Ignore IEs coming in on two separate wiphys with | |
1304 | * the same alpha2 and environment cap */ | |
1305 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, | |
1306 | alpha2) && | |
1307 | env == drv_last_ie->env)) { | |
1308 | goto out; | |
1309 | } | |
1310 | /* We could potentially intersect though */ | |
1311 | goto out; | |
1312 | } | |
1313 | } | |
1314 | ||
1315 | rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); | |
1316 | if (!rd) | |
1317 | goto out; | |
1318 | ||
1319 | /* This will not happen right now but we leave it here for the | |
1320 | * the future when we want to add suspend/resume support and having | |
1321 | * the user move to another country after doing so, or having the user | |
1322 | * move to another AP. Right now we just trust the first AP. This is why | |
1323 | * this is marked as likley(). If we hit this before we add this support | |
1324 | * we want to be informed of it as it would indicate a mistake in the | |
1325 | * current design */ | |
1326 | if (likely(WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))) | |
1327 | goto out; | |
1328 | ||
1329 | /* We keep this around for when CRDA comes back with a response so | |
1330 | * we can intersect with that */ | |
1331 | country_ie_regdomain = rd; | |
1332 | ||
1333 | __regulatory_hint(wiphy, REGDOM_SET_BY_COUNTRY_IE, | |
1334 | country_ie_regdomain->alpha2, checksum, env); | |
1335 | ||
1336 | out: | |
a1794390 | 1337 | mutex_unlock(&cfg80211_mutex); |
3f2355cb LR |
1338 | } |
1339 | EXPORT_SYMBOL(regulatory_hint_11d); | |
b2e1b302 | 1340 | |
a3d2eaf0 | 1341 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1342 | { |
1343 | unsigned int i; | |
a3d2eaf0 JB |
1344 | const struct ieee80211_reg_rule *reg_rule = NULL; |
1345 | const struct ieee80211_freq_range *freq_range = NULL; | |
1346 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
1347 | |
1348 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
1349 | "(max_antenna_gain, max_eirp)\n"); | |
1350 | ||
1351 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1352 | reg_rule = &rd->reg_rules[i]; | |
1353 | freq_range = ®_rule->freq_range; | |
1354 | power_rule = ®_rule->power_rule; | |
1355 | ||
1356 | /* There may not be documentation for max antenna gain | |
1357 | * in certain regions */ | |
1358 | if (power_rule->max_antenna_gain) | |
1359 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1360 | "(%d mBi, %d mBm)\n", | |
1361 | freq_range->start_freq_khz, | |
1362 | freq_range->end_freq_khz, | |
1363 | freq_range->max_bandwidth_khz, | |
1364 | power_rule->max_antenna_gain, | |
1365 | power_rule->max_eirp); | |
1366 | else | |
1367 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1368 | "(N/A, %d mBm)\n", | |
1369 | freq_range->start_freq_khz, | |
1370 | freq_range->end_freq_khz, | |
1371 | freq_range->max_bandwidth_khz, | |
1372 | power_rule->max_eirp); | |
1373 | } | |
1374 | } | |
1375 | ||
a3d2eaf0 | 1376 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1377 | { |
1378 | ||
3f2355cb LR |
1379 | if (is_intersected_alpha2(rd->alpha2)) { |
1380 | struct wiphy *wiphy = NULL; | |
1381 | struct cfg80211_registered_device *drv; | |
1382 | ||
1383 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
1384 | if (last_request->wiphy) { | |
1385 | wiphy = last_request->wiphy; | |
1386 | drv = wiphy_to_dev(wiphy); | |
1387 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1388 | "domain updated by AP to: %c%c\n", | |
1389 | drv->country_ie_alpha2[0], | |
1390 | drv->country_ie_alpha2[1]); | |
1391 | } else | |
1392 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1393 | "domain intersected: \n"); | |
1394 | } else | |
1395 | printk(KERN_INFO "cfg80211: Current regulatory " | |
039498c6 | 1396 | "domain intersected: \n"); |
3f2355cb | 1397 | } else if (is_world_regdom(rd->alpha2)) |
b2e1b302 LR |
1398 | printk(KERN_INFO "cfg80211: World regulatory " |
1399 | "domain updated:\n"); | |
1400 | else { | |
1401 | if (is_unknown_alpha2(rd->alpha2)) | |
1402 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1403 | "changed to driver built-in settings " | |
1404 | "(unknown country)\n"); | |
1405 | else | |
1406 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1407 | "changed to country: %c%c\n", | |
1408 | rd->alpha2[0], rd->alpha2[1]); | |
1409 | } | |
1410 | print_rd_rules(rd); | |
1411 | } | |
1412 | ||
2df78167 | 1413 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
1414 | { |
1415 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1416 | rd->alpha2[0], rd->alpha2[1]); | |
1417 | print_rd_rules(rd); | |
1418 | } | |
1419 | ||
3f2355cb LR |
1420 | #ifdef CONFIG_CFG80211_REG_DEBUG |
1421 | static void reg_country_ie_process_debug( | |
1422 | const struct ieee80211_regdomain *rd, | |
1423 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1424 | const struct ieee80211_regdomain *intersected_rd) | |
1425 | { | |
1426 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
1427 | print_regdomain_info(country_ie_regdomain); | |
1428 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
1429 | print_regdomain_info(rd); | |
1430 | if (intersected_rd) { | |
1431 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
1432 | "and get:\n"); | |
667ecd01 | 1433 | print_regdomain_info(intersected_rd); |
3f2355cb LR |
1434 | return; |
1435 | } | |
1436 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
1437 | } | |
1438 | #else | |
1439 | static inline void reg_country_ie_process_debug( | |
1440 | const struct ieee80211_regdomain *rd, | |
1441 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1442 | const struct ieee80211_regdomain *intersected_rd) | |
1443 | { | |
1444 | } | |
1445 | #endif | |
1446 | ||
d2372b31 | 1447 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 1448 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1449 | { |
9c96477d | 1450 | const struct ieee80211_regdomain *intersected_rd = NULL; |
3f2355cb LR |
1451 | struct cfg80211_registered_device *drv = NULL; |
1452 | struct wiphy *wiphy = NULL; | |
b2e1b302 LR |
1453 | /* Some basic sanity checks first */ |
1454 | ||
b2e1b302 | 1455 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 1456 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1457 | return -EINVAL; |
1458 | update_world_regdomain(rd); | |
1459 | return 0; | |
1460 | } | |
b2e1b302 LR |
1461 | |
1462 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1463 | !is_unknown_alpha2(rd->alpha2)) | |
1464 | return -EINVAL; | |
1465 | ||
f6037d09 | 1466 | if (!last_request) |
b2e1b302 LR |
1467 | return -EINVAL; |
1468 | ||
3f2355cb LR |
1469 | /* Lets only bother proceeding on the same alpha2 if the current |
1470 | * rd is non static (it means CRDA was present and was used last) | |
1471 | * and the pending request came in from a country IE */ | |
1472 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
1473 | /* If someone else asked us to change the rd lets only bother | |
1474 | * checking if the alpha2 changes if CRDA was already called */ | |
1475 | if (!is_old_static_regdom(cfg80211_regdomain) && | |
1476 | !regdom_changed(rd->alpha2)) | |
1477 | return -EINVAL; | |
1478 | } | |
1479 | ||
1480 | wiphy = last_request->wiphy; | |
b2e1b302 LR |
1481 | |
1482 | /* Now lets set the regulatory domain, update all driver channels | |
1483 | * and finally inform them of what we have done, in case they want | |
1484 | * to review or adjust their own settings based on their own | |
1485 | * internal EEPROM data */ | |
1486 | ||
f6037d09 | 1487 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
1488 | return -EINVAL; |
1489 | ||
8375af3b LR |
1490 | if (!is_valid_rd(rd)) { |
1491 | printk(KERN_ERR "cfg80211: Invalid " | |
1492 | "regulatory domain detected:\n"); | |
1493 | print_regdomain_info(rd); | |
1494 | return -EINVAL; | |
b2e1b302 LR |
1495 | } |
1496 | ||
b8295acd | 1497 | if (!last_request->intersect) { |
3e0c3ff3 LR |
1498 | int r; |
1499 | ||
1500 | if (last_request->initiator != REGDOM_SET_BY_DRIVER) { | |
1501 | reset_regdomains(); | |
1502 | cfg80211_regdomain = rd; | |
1503 | return 0; | |
1504 | } | |
1505 | ||
1506 | /* For a driver hint, lets copy the regulatory domain the | |
1507 | * driver wanted to the wiphy to deal with conflicts */ | |
1508 | ||
1509 | BUG_ON(last_request->wiphy->regd); | |
1510 | ||
1511 | r = reg_copy_regd(&last_request->wiphy->regd, rd); | |
1512 | if (r) | |
1513 | return r; | |
1514 | ||
b8295acd LR |
1515 | reset_regdomains(); |
1516 | cfg80211_regdomain = rd; | |
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | /* Intersection requires a bit more work */ | |
1521 | ||
1522 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
1523 | ||
9c96477d LR |
1524 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
1525 | if (!intersected_rd) | |
1526 | return -EINVAL; | |
b8295acd | 1527 | |
3e0c3ff3 LR |
1528 | /* We can trash what CRDA provided now. |
1529 | * However if a driver requested this specific regulatory | |
1530 | * domain we keep it for its private use */ | |
1531 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) | |
1532 | last_request->wiphy->regd = rd; | |
1533 | else | |
1534 | kfree(rd); | |
1535 | ||
b8295acd LR |
1536 | rd = NULL; |
1537 | ||
1538 | reset_regdomains(); | |
1539 | cfg80211_regdomain = intersected_rd; | |
1540 | ||
1541 | return 0; | |
9c96477d LR |
1542 | } |
1543 | ||
3f2355cb LR |
1544 | /* |
1545 | * Country IE requests are handled a bit differently, we intersect | |
1546 | * the country IE rd with what CRDA believes that country should have | |
1547 | */ | |
1548 | ||
1549 | BUG_ON(!country_ie_regdomain); | |
1550 | ||
1551 | if (rd != country_ie_regdomain) { | |
1552 | /* Intersect what CRDA returned and our what we | |
1553 | * had built from the Country IE received */ | |
1554 | ||
1555 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); | |
1556 | ||
1557 | reg_country_ie_process_debug(rd, country_ie_regdomain, | |
1558 | intersected_rd); | |
1559 | ||
1560 | kfree(country_ie_regdomain); | |
1561 | country_ie_regdomain = NULL; | |
1562 | } else { | |
1563 | /* This would happen when CRDA was not present and | |
1564 | * OLD_REGULATORY was enabled. We intersect our Country | |
1565 | * IE rd and what was set on cfg80211 originally */ | |
1566 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); | |
1567 | } | |
1568 | ||
1569 | if (!intersected_rd) | |
1570 | return -EINVAL; | |
1571 | ||
1572 | drv = wiphy_to_dev(wiphy); | |
1573 | ||
1574 | drv->country_ie_alpha2[0] = rd->alpha2[0]; | |
1575 | drv->country_ie_alpha2[1] = rd->alpha2[1]; | |
1576 | drv->env = last_request->country_ie_env; | |
1577 | ||
1578 | BUG_ON(intersected_rd == rd); | |
1579 | ||
1580 | kfree(rd); | |
1581 | rd = NULL; | |
1582 | ||
b8295acd | 1583 | reset_regdomains(); |
3f2355cb | 1584 | cfg80211_regdomain = intersected_rd; |
b2e1b302 LR |
1585 | |
1586 | return 0; | |
1587 | } | |
1588 | ||
1589 | ||
1590 | /* Use this call to set the current regulatory domain. Conflicts with | |
1591 | * multiple drivers can be ironed out later. Caller must've already | |
a1794390 | 1592 | * kmalloc'd the rd structure. Caller must hold cfg80211_mutex */ |
a3d2eaf0 | 1593 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 1594 | { |
b2e1b302 LR |
1595 | int r; |
1596 | ||
761cf7ec LR |
1597 | assert_cfg80211_lock(); |
1598 | ||
b2e1b302 LR |
1599 | /* Note that this doesn't update the wiphys, this is done below */ |
1600 | r = __set_regdom(rd); | |
d2372b31 JB |
1601 | if (r) { |
1602 | kfree(rd); | |
b2e1b302 | 1603 | return r; |
d2372b31 | 1604 | } |
b2e1b302 | 1605 | |
b2e1b302 | 1606 | /* This would make this whole thing pointless */ |
a01ddafd LR |
1607 | if (!last_request->intersect) |
1608 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
1609 | |
1610 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 1611 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 1612 | |
a01ddafd | 1613 | print_regdomain(cfg80211_regdomain); |
b2e1b302 LR |
1614 | |
1615 | return r; | |
1616 | } | |
1617 | ||
a1794390 | 1618 | /* Caller must hold cfg80211_mutex */ |
3f2355cb LR |
1619 | void reg_device_remove(struct wiphy *wiphy) |
1620 | { | |
761cf7ec LR |
1621 | assert_cfg80211_lock(); |
1622 | ||
3e0c3ff3 | 1623 | kfree(wiphy->regd); |
4a4f4d80 | 1624 | if (!last_request || !last_request->wiphy) |
3f2355cb LR |
1625 | return; |
1626 | if (last_request->wiphy != wiphy) | |
1627 | return; | |
1628 | last_request->wiphy = NULL; | |
1629 | last_request->country_ie_env = ENVIRON_ANY; | |
1630 | } | |
1631 | ||
b2e1b302 LR |
1632 | int regulatory_init(void) |
1633 | { | |
bcf4f99b | 1634 | int err = 0; |
734366de | 1635 | |
b2e1b302 LR |
1636 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
1637 | if (IS_ERR(reg_pdev)) | |
1638 | return PTR_ERR(reg_pdev); | |
734366de JB |
1639 | |
1640 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
a3d2eaf0 | 1641 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 1642 | |
942b25cf | 1643 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de JB |
1644 | print_regdomain_info(cfg80211_regdomain); |
1645 | /* The old code still requests for a new regdomain and if | |
1646 | * you have CRDA you get it updated, otherwise you get | |
1647 | * stuck with the static values. We ignore "EU" code as | |
1648 | * that is not a valid ISO / IEC 3166 alpha2 */ | |
ac9440a4 | 1649 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') |
ba25c141 | 1650 | err = regulatory_hint_core(ieee80211_regdom); |
734366de | 1651 | #else |
a3d2eaf0 | 1652 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 1653 | |
ba25c141 | 1654 | err = regulatory_hint_core("00"); |
bcf4f99b | 1655 | #endif |
ba25c141 | 1656 | if (err) { |
bcf4f99b LR |
1657 | if (err == -ENOMEM) |
1658 | return err; | |
1659 | /* | |
1660 | * N.B. kobject_uevent_env() can fail mainly for when we're out | |
1661 | * memory which is handled and propagated appropriately above | |
1662 | * but it can also fail during a netlink_broadcast() or during | |
1663 | * early boot for call_usermodehelper(). For now treat these | |
1664 | * errors as non-fatal. | |
1665 | */ | |
1666 | printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable " | |
1667 | "to call CRDA during init"); | |
1668 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1669 | /* We want to find out exactly why when debugging */ | |
1670 | WARN_ON(err); | |
734366de | 1671 | #endif |
bcf4f99b | 1672 | } |
734366de | 1673 | |
b2e1b302 LR |
1674 | return 0; |
1675 | } | |
1676 | ||
1677 | void regulatory_exit(void) | |
1678 | { | |
a1794390 | 1679 | mutex_lock(&cfg80211_mutex); |
734366de | 1680 | |
b2e1b302 | 1681 | reset_regdomains(); |
734366de | 1682 | |
3f2355cb LR |
1683 | kfree(country_ie_regdomain); |
1684 | country_ie_regdomain = NULL; | |
1685 | ||
f6037d09 JB |
1686 | kfree(last_request); |
1687 | ||
b2e1b302 | 1688 | platform_device_unregister(reg_pdev); |
734366de | 1689 | |
a1794390 | 1690 | mutex_unlock(&cfg80211_mutex); |
8318d78a | 1691 | } |