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