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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 | |
734366de JB |
45 | /* wiphy is set if this request's initiator is REGDOM_SET_BY_DRIVER */ |
46 | struct regulatory_request { | |
47 | struct list_head list; | |
48 | struct wiphy *wiphy; | |
49 | int granted; | |
50 | enum reg_set_by initiator; | |
51 | char alpha2[2]; | |
52 | }; | |
53 | ||
54 | static LIST_HEAD(regulatory_requests); | |
55 | DEFINE_MUTEX(cfg80211_reg_mutex); | |
56 | ||
b2e1b302 LR |
57 | /* To trigger userspace events */ |
58 | static struct platform_device *reg_pdev; | |
8318d78a | 59 | |
b2e1b302 LR |
60 | /* Keep the ordering from large to small */ |
61 | static u32 supported_bandwidths[] = { | |
62 | MHZ_TO_KHZ(40), | |
63 | MHZ_TO_KHZ(20), | |
8318d78a JB |
64 | }; |
65 | ||
734366de JB |
66 | static struct list_head regulatory_requests; |
67 | ||
68 | /* Central wireless core regulatory domains, we only need two, | |
69 | * the current one and a world regulatory domain in case we have no | |
70 | * information to give us an alpha2 */ | |
a3d2eaf0 | 71 | static const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de JB |
72 | |
73 | /* We keep a static world regulatory domain in case of the absence of CRDA */ | |
74 | static const struct ieee80211_regdomain world_regdom = { | |
75 | .n_reg_rules = 1, | |
76 | .alpha2 = "00", | |
77 | .reg_rules = { | |
78 | REG_RULE(2412-10, 2462+10, 40, 6, 20, | |
79 | NL80211_RRF_PASSIVE_SCAN | | |
80 | NL80211_RRF_NO_IBSS), | |
81 | } | |
82 | }; | |
83 | ||
a3d2eaf0 JB |
84 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
85 | &world_regdom; | |
734366de JB |
86 | |
87 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
88 | static char *ieee80211_regdom = "US"; | |
89 | module_param(ieee80211_regdom, charp, 0444); | |
90 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
91 | ||
92 | /* We assume 40 MHz bandwidth for the old regulatory work. | |
93 | * We make emphasis we are using the exact same frequencies | |
94 | * as before */ | |
95 | ||
96 | static const struct ieee80211_regdomain us_regdom = { | |
97 | .n_reg_rules = 6, | |
98 | .alpha2 = "US", | |
99 | .reg_rules = { | |
100 | /* IEEE 802.11b/g, channels 1..11 */ | |
101 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
102 | /* IEEE 802.11a, channel 36 */ | |
103 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
104 | /* IEEE 802.11a, channel 40 */ | |
105 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
106 | /* IEEE 802.11a, channel 44 */ | |
107 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
108 | /* IEEE 802.11a, channels 48..64 */ | |
109 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
110 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
111 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
112 | } | |
113 | }; | |
114 | ||
115 | static const struct ieee80211_regdomain jp_regdom = { | |
116 | .n_reg_rules = 3, | |
117 | .alpha2 = "JP", | |
118 | .reg_rules = { | |
119 | /* IEEE 802.11b/g, channels 1..14 */ | |
120 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
121 | /* IEEE 802.11a, channels 34..48 */ | |
122 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
123 | NL80211_RRF_PASSIVE_SCAN), | |
124 | /* IEEE 802.11a, channels 52..64 */ | |
125 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
126 | NL80211_RRF_NO_IBSS | | |
127 | NL80211_RRF_DFS), | |
128 | } | |
129 | }; | |
130 | ||
131 | static const struct ieee80211_regdomain eu_regdom = { | |
132 | .n_reg_rules = 6, | |
133 | /* This alpha2 is bogus, we leave it here just for stupid | |
134 | * backward compatibility */ | |
135 | .alpha2 = "EU", | |
136 | .reg_rules = { | |
137 | /* IEEE 802.11b/g, channels 1..13 */ | |
138 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
139 | /* IEEE 802.11a, channel 36 */ | |
140 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
141 | NL80211_RRF_PASSIVE_SCAN), | |
142 | /* IEEE 802.11a, channel 40 */ | |
143 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
144 | NL80211_RRF_PASSIVE_SCAN), | |
145 | /* IEEE 802.11a, channel 44 */ | |
146 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
147 | NL80211_RRF_PASSIVE_SCAN), | |
148 | /* IEEE 802.11a, channels 48..64 */ | |
149 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
150 | NL80211_RRF_NO_IBSS | | |
151 | NL80211_RRF_DFS), | |
152 | /* IEEE 802.11a, channels 100..140 */ | |
153 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
154 | NL80211_RRF_NO_IBSS | | |
155 | NL80211_RRF_DFS), | |
156 | } | |
157 | }; | |
158 | ||
159 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
160 | { | |
161 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
162 | return &us_regdom; | |
163 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
164 | return &jp_regdom; | |
165 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
166 | return &eu_regdom; | |
167 | /* Default, as per the old rules */ | |
168 | return &us_regdom; | |
169 | } | |
170 | ||
a3d2eaf0 | 171 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
172 | { |
173 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
174 | return true; | |
175 | return false; | |
176 | } | |
942b25cf JB |
177 | #else |
178 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 179 | { |
942b25cf | 180 | return false; |
734366de | 181 | } |
942b25cf JB |
182 | #endif |
183 | ||
734366de JB |
184 | static void reset_regdomains(void) |
185 | { | |
942b25cf JB |
186 | /* avoid freeing static information or freeing something twice */ |
187 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
188 | cfg80211_regdomain = NULL; | |
189 | if (cfg80211_world_regdom == &world_regdom) | |
190 | cfg80211_world_regdom = NULL; | |
191 | if (cfg80211_regdomain == &world_regdom) | |
192 | cfg80211_regdomain = NULL; | |
193 | if (is_old_static_regdom(cfg80211_regdomain)) | |
194 | cfg80211_regdomain = NULL; | |
195 | ||
196 | kfree(cfg80211_regdomain); | |
197 | kfree(cfg80211_world_regdom); | |
734366de | 198 | |
a3d2eaf0 | 199 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
200 | cfg80211_regdomain = NULL; |
201 | } | |
202 | ||
203 | /* Dynamic world regulatory domain requested by the wireless | |
204 | * core upon initialization */ | |
a3d2eaf0 | 205 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de JB |
206 | { |
207 | BUG_ON(list_empty(®ulatory_requests)); | |
208 | ||
209 | reset_regdomains(); | |
210 | ||
211 | cfg80211_world_regdom = rd; | |
212 | cfg80211_regdomain = rd; | |
213 | } | |
734366de | 214 | |
a3d2eaf0 | 215 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
216 | { |
217 | if (!alpha2) | |
218 | return false; | |
219 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
220 | return true; | |
221 | return false; | |
222 | } | |
8318d78a | 223 | |
a3d2eaf0 | 224 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
225 | { |
226 | if (!alpha2) | |
227 | return false; | |
228 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
229 | return true; | |
230 | return false; | |
231 | } | |
8318d78a | 232 | |
b2e1b302 LR |
233 | static bool is_alpha_upper(char letter) |
234 | { | |
235 | /* ASCII A - Z */ | |
236 | if (letter >= 65 && letter <= 90) | |
237 | return true; | |
238 | return false; | |
239 | } | |
8318d78a | 240 | |
a3d2eaf0 | 241 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
242 | { |
243 | if (!alpha2) | |
244 | return false; | |
245 | /* Special case where regulatory domain was built by driver | |
246 | * but a specific alpha2 cannot be determined */ | |
247 | if (alpha2[0] == '9' && alpha2[1] == '9') | |
248 | return true; | |
249 | return false; | |
250 | } | |
8318d78a | 251 | |
a3d2eaf0 | 252 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
253 | { |
254 | if (!alpha2) | |
255 | return false; | |
256 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
257 | return true; | |
258 | return false; | |
259 | } | |
8318d78a | 260 | |
a3d2eaf0 | 261 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
262 | { |
263 | if (!alpha2_x || !alpha2_y) | |
264 | return false; | |
265 | if (alpha2_x[0] == alpha2_y[0] && | |
266 | alpha2_x[1] == alpha2_y[1]) | |
267 | return true; | |
268 | return false; | |
269 | } | |
270 | ||
a3d2eaf0 | 271 | static bool regdom_changed(const char *alpha2) |
b2e1b302 LR |
272 | { |
273 | if (!cfg80211_regdomain) | |
274 | return true; | |
275 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
276 | return false; | |
277 | return true; | |
278 | } | |
279 | ||
280 | /* This lets us keep regulatory code which is updated on a regulatory | |
281 | * basis in userspace. */ | |
282 | static int call_crda(const char *alpha2) | |
283 | { | |
284 | char country_env[9 + 2] = "COUNTRY="; | |
285 | char *envp[] = { | |
286 | country_env, | |
287 | NULL | |
288 | }; | |
289 | ||
290 | if (!is_world_regdom((char *) alpha2)) | |
291 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
292 | alpha2[0], alpha2[1]); | |
293 | else | |
b2e1b302 LR |
294 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
295 | "regulatory domain\n"); | |
b2e1b302 LR |
296 | |
297 | country_env[8] = alpha2[0]; | |
298 | country_env[9] = alpha2[1]; | |
299 | ||
300 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
301 | } | |
302 | ||
303 | /* This has the logic which determines when a new request | |
304 | * should be ignored. */ | |
305 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
306 | char *alpha2, struct ieee80211_regdomain *rd) | |
307 | { | |
308 | struct regulatory_request *last_request = NULL; | |
59d393ad | 309 | |
b2e1b302 LR |
310 | /* All initial requests are respected */ |
311 | if (list_empty(®ulatory_requests)) | |
312 | return 0; | |
313 | ||
314 | last_request = list_first_entry(®ulatory_requests, | |
315 | struct regulatory_request, list); | |
316 | ||
317 | switch (set_by) { | |
318 | case REGDOM_SET_BY_INIT: | |
319 | return -EINVAL; | |
320 | case REGDOM_SET_BY_CORE: | |
321 | /* Always respect new wireless core hints, should only | |
322 | * come in for updating the world regulatory domain at init | |
323 | * anyway */ | |
324 | return 0; | |
325 | case REGDOM_SET_BY_COUNTRY_IE: | |
326 | if (last_request->initiator == set_by) { | |
327 | if (last_request->wiphy != wiphy) { | |
328 | /* Two cards with two APs claiming different | |
329 | * different Country IE alpha2s! | |
330 | * You're special!! */ | |
331 | if (!alpha2_equal(last_request->alpha2, | |
332 | cfg80211_regdomain->alpha2)) { | |
333 | /* XXX: Deal with conflict, consider | |
334 | * building a new one out of the | |
335 | * intersection */ | |
336 | WARN_ON(1); | |
337 | return -EOPNOTSUPP; | |
338 | } | |
339 | return -EALREADY; | |
340 | } | |
341 | /* Two consecutive Country IE hints on the same wiphy */ | |
342 | if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
343 | return 0; | |
344 | return -EALREADY; | |
345 | } | |
346 | if (WARN_ON(!is_alpha2_set(alpha2) || !is_an_alpha2(alpha2)), | |
347 | "Invalid Country IE regulatory hint passed " | |
348 | "to the wireless core\n") | |
349 | return -EINVAL; | |
350 | /* We ignore Country IE hints for now, as we haven't yet | |
351 | * added the dot11MultiDomainCapabilityEnabled flag | |
352 | * for wiphys */ | |
353 | return 1; | |
354 | case REGDOM_SET_BY_DRIVER: | |
355 | BUG_ON(!wiphy); | |
356 | if (last_request->initiator == set_by) { | |
357 | /* Two separate drivers hinting different things, | |
358 | * this is possible if you have two devices present | |
359 | * on a system with different EEPROM regulatory | |
360 | * readings. XXX: Do intersection, we support only | |
361 | * the first regulatory hint for now */ | |
362 | if (last_request->wiphy != wiphy) | |
363 | return -EALREADY; | |
364 | if (rd) | |
365 | return -EALREADY; | |
366 | /* Driver should not be trying to hint different | |
367 | * regulatory domains! */ | |
368 | BUG_ON(!alpha2_equal(alpha2, | |
369 | cfg80211_regdomain->alpha2)); | |
370 | return -EALREADY; | |
371 | } | |
372 | if (last_request->initiator == REGDOM_SET_BY_CORE) | |
373 | return 0; | |
374 | /* XXX: Handle intersection, and add the | |
375 | * dot11MultiDomainCapabilityEnabled flag to wiphy. For now | |
376 | * we assume the driver has this set to false, following the | |
377 | * 802.11d dot11MultiDomainCapabilityEnabled documentation */ | |
378 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
379 | return 0; | |
380 | return 0; | |
381 | case REGDOM_SET_BY_USER: | |
382 | if (last_request->initiator == set_by || | |
383 | last_request->initiator == REGDOM_SET_BY_CORE) | |
384 | return 0; | |
385 | /* Drivers can use their wiphy's reg_notifier() | |
386 | * to override any information */ | |
387 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) | |
388 | return 0; | |
389 | /* XXX: Handle intersection */ | |
390 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
391 | return -EOPNOTSUPP; | |
392 | return 0; | |
393 | default: | |
394 | return -EINVAL; | |
8318d78a | 395 | } |
b2e1b302 | 396 | } |
8318d78a | 397 | |
a3d2eaf0 | 398 | static bool __reg_is_valid_request(const char *alpha2, |
b2e1b302 LR |
399 | struct regulatory_request **request) |
400 | { | |
401 | struct regulatory_request *req; | |
402 | if (list_empty(®ulatory_requests)) | |
403 | return false; | |
404 | list_for_each_entry(req, ®ulatory_requests, list) { | |
405 | if (alpha2_equal(req->alpha2, alpha2)) { | |
406 | *request = req; | |
407 | return true; | |
408 | } | |
409 | } | |
410 | return false; | |
411 | } | |
8318d78a | 412 | |
b2e1b302 | 413 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 414 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 LR |
415 | { |
416 | struct regulatory_request *request = NULL; | |
417 | return __reg_is_valid_request(alpha2, &request); | |
418 | } | |
8318d78a | 419 | |
b2e1b302 | 420 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 421 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 422 | { |
a3d2eaf0 | 423 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
424 | u32 freq_diff; |
425 | ||
426 | if (freq_range->start_freq_khz == 0 || freq_range->end_freq_khz == 0) | |
427 | return false; | |
428 | ||
429 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
430 | return false; | |
431 | ||
432 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
433 | ||
434 | if (freq_range->max_bandwidth_khz > freq_diff) | |
435 | return false; | |
436 | ||
437 | return true; | |
438 | } | |
439 | ||
a3d2eaf0 | 440 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 441 | { |
a3d2eaf0 | 442 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 443 | unsigned int i; |
8318d78a | 444 | |
b2e1b302 LR |
445 | if (!rd->n_reg_rules) |
446 | return false; | |
8318d78a | 447 | |
b2e1b302 LR |
448 | for (i = 0; i < rd->n_reg_rules; i++) { |
449 | reg_rule = &rd->reg_rules[i]; | |
450 | if (!is_valid_reg_rule(reg_rule)) | |
451 | return false; | |
452 | } | |
453 | ||
454 | return true; | |
8318d78a JB |
455 | } |
456 | ||
b2e1b302 LR |
457 | /* Returns value in KHz */ |
458 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
459 | u32 freq) | |
460 | { | |
461 | unsigned int i; | |
462 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
463 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
464 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
465 | if (start_freq_khz >= freq_range->start_freq_khz && | |
466 | end_freq_khz <= freq_range->end_freq_khz) | |
467 | return supported_bandwidths[i]; | |
468 | } | |
469 | return 0; | |
470 | } | |
8318d78a | 471 | |
b2e1b302 LR |
472 | /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may |
473 | * want to just have the channel structure use these */ | |
474 | static u32 map_regdom_flags(u32 rd_flags) | |
475 | { | |
476 | u32 channel_flags = 0; | |
477 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
478 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
479 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
480 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
481 | if (rd_flags & NL80211_RRF_DFS) | |
482 | channel_flags |= IEEE80211_CHAN_RADAR; | |
483 | return channel_flags; | |
484 | } | |
485 | ||
486 | /** | |
487 | * freq_reg_info - get regulatory information for the given frequency | |
488 | * @center_freq: Frequency in KHz for which we want regulatory information for | |
489 | * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one | |
490 | * you can set this to 0. If this frequency is allowed we then set | |
491 | * this value to the maximum allowed bandwidth. | |
492 | * @reg_rule: the regulatory rule which we have for this frequency | |
493 | * | |
494 | * Use this function to get the regulatory rule for a specific frequency. | |
495 | */ | |
496 | static int freq_reg_info(u32 center_freq, u32 *bandwidth, | |
497 | const struct ieee80211_reg_rule **reg_rule) | |
8318d78a JB |
498 | { |
499 | int i; | |
b2e1b302 | 500 | u32 max_bandwidth = 0; |
8318d78a | 501 | |
b2e1b302 LR |
502 | if (!cfg80211_regdomain) |
503 | return -EINVAL; | |
504 | ||
505 | for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) { | |
506 | const struct ieee80211_reg_rule *rr; | |
507 | const struct ieee80211_freq_range *fr = NULL; | |
508 | const struct ieee80211_power_rule *pr = NULL; | |
509 | ||
510 | rr = &cfg80211_regdomain->reg_rules[i]; | |
511 | fr = &rr->freq_range; | |
512 | pr = &rr->power_rule; | |
513 | max_bandwidth = freq_max_bandwidth(fr, center_freq); | |
514 | if (max_bandwidth && *bandwidth <= max_bandwidth) { | |
515 | *reg_rule = rr; | |
516 | *bandwidth = max_bandwidth; | |
8318d78a JB |
517 | break; |
518 | } | |
519 | } | |
520 | ||
b2e1b302 LR |
521 | return !max_bandwidth; |
522 | } | |
523 | ||
524 | static void handle_channel(struct ieee80211_channel *chan) | |
525 | { | |
526 | int r; | |
527 | u32 flags = chan->orig_flags; | |
528 | u32 max_bandwidth = 0; | |
529 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
530 | const struct ieee80211_power_rule *power_rule = NULL; | |
531 | ||
532 | r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq), | |
533 | &max_bandwidth, ®_rule); | |
534 | ||
535 | if (r) { | |
8318d78a JB |
536 | flags |= IEEE80211_CHAN_DISABLED; |
537 | chan->flags = flags; | |
538 | return; | |
539 | } | |
540 | ||
b2e1b302 LR |
541 | power_rule = ®_rule->power_rule; |
542 | ||
543 | chan->flags = flags | map_regdom_flags(reg_rule->flags); | |
8318d78a | 544 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
545 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
546 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 547 | if (chan->orig_mpwr) |
b2e1b302 LR |
548 | chan->max_power = min(chan->orig_mpwr, |
549 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 550 | else |
b2e1b302 | 551 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
552 | } |
553 | ||
b2e1b302 | 554 | static void handle_band(struct ieee80211_supported_band *sband) |
8318d78a JB |
555 | { |
556 | int i; | |
557 | ||
558 | for (i = 0; i < sband->n_channels; i++) | |
b2e1b302 | 559 | handle_channel(&sband->channels[i]); |
8318d78a JB |
560 | } |
561 | ||
b2e1b302 | 562 | static void update_all_wiphy_regulatory(enum reg_set_by setby) |
8318d78a | 563 | { |
b2e1b302 | 564 | struct cfg80211_registered_device *drv; |
8318d78a | 565 | |
b2e1b302 LR |
566 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
567 | wiphy_update_regulatory(&drv->wiphy, setby); | |
568 | } | |
569 | ||
570 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
571 | { | |
572 | enum ieee80211_band band; | |
573 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
8318d78a | 574 | if (wiphy->bands[band]) |
b2e1b302 LR |
575 | handle_band(wiphy->bands[band]); |
576 | if (wiphy->reg_notifier) | |
577 | wiphy->reg_notifier(wiphy, setby); | |
578 | } | |
579 | } | |
580 | ||
581 | /* Caller must hold &cfg80211_drv_mutex */ | |
582 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, | |
583 | const char *alpha2, struct ieee80211_regdomain *rd) | |
584 | { | |
585 | struct regulatory_request *request; | |
586 | char *rd_alpha2; | |
587 | int r = 0; | |
588 | ||
589 | r = ignore_request(wiphy, set_by, (char *) alpha2, rd); | |
590 | if (r) | |
591 | return r; | |
592 | ||
593 | if (rd) | |
594 | rd_alpha2 = rd->alpha2; | |
595 | else | |
596 | rd_alpha2 = (char *) alpha2; | |
597 | ||
598 | switch (set_by) { | |
599 | case REGDOM_SET_BY_CORE: | |
600 | case REGDOM_SET_BY_COUNTRY_IE: | |
601 | case REGDOM_SET_BY_DRIVER: | |
602 | case REGDOM_SET_BY_USER: | |
603 | request = kzalloc(sizeof(struct regulatory_request), | |
604 | GFP_KERNEL); | |
605 | if (!request) | |
606 | return -ENOMEM; | |
607 | ||
608 | request->alpha2[0] = rd_alpha2[0]; | |
609 | request->alpha2[1] = rd_alpha2[1]; | |
610 | request->initiator = set_by; | |
611 | request->wiphy = wiphy; | |
612 | ||
613 | list_add_tail(&request->list, ®ulatory_requests); | |
614 | if (rd) | |
615 | break; | |
616 | r = call_crda(alpha2); | |
617 | #ifndef CONFIG_WIRELESS_OLD_REGULATORY | |
618 | if (r) | |
619 | printk(KERN_ERR "cfg80211: Failed calling CRDA\n"); | |
620 | #endif | |
621 | break; | |
622 | default: | |
623 | r = -ENOTSUPP; | |
624 | break; | |
625 | } | |
626 | ||
627 | return r; | |
628 | } | |
629 | ||
630 | /* If rd is not NULL and if this call fails the caller must free it */ | |
631 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2, | |
632 | struct ieee80211_regdomain *rd) | |
633 | { | |
634 | int r; | |
635 | BUG_ON(!rd && !alpha2); | |
636 | ||
637 | mutex_lock(&cfg80211_drv_mutex); | |
638 | ||
639 | r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, rd); | |
640 | if (r || !rd) | |
641 | goto unlock_and_exit; | |
642 | ||
643 | /* If the driver passed a regulatory domain we skipped asking | |
644 | * userspace for one so we can now go ahead and set it */ | |
645 | r = set_regdom(rd); | |
646 | ||
647 | unlock_and_exit: | |
648 | mutex_unlock(&cfg80211_drv_mutex); | |
649 | return r; | |
650 | } | |
651 | EXPORT_SYMBOL(regulatory_hint); | |
652 | ||
653 | ||
a3d2eaf0 | 654 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
655 | { |
656 | unsigned int i; | |
a3d2eaf0 JB |
657 | const struct ieee80211_reg_rule *reg_rule = NULL; |
658 | const struct ieee80211_freq_range *freq_range = NULL; | |
659 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
660 | |
661 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
662 | "(max_antenna_gain, max_eirp)\n"); | |
663 | ||
664 | for (i = 0; i < rd->n_reg_rules; i++) { | |
665 | reg_rule = &rd->reg_rules[i]; | |
666 | freq_range = ®_rule->freq_range; | |
667 | power_rule = ®_rule->power_rule; | |
668 | ||
669 | /* There may not be documentation for max antenna gain | |
670 | * in certain regions */ | |
671 | if (power_rule->max_antenna_gain) | |
672 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
673 | "(%d mBi, %d mBm)\n", | |
674 | freq_range->start_freq_khz, | |
675 | freq_range->end_freq_khz, | |
676 | freq_range->max_bandwidth_khz, | |
677 | power_rule->max_antenna_gain, | |
678 | power_rule->max_eirp); | |
679 | else | |
680 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
681 | "(N/A, %d mBm)\n", | |
682 | freq_range->start_freq_khz, | |
683 | freq_range->end_freq_khz, | |
684 | freq_range->max_bandwidth_khz, | |
685 | power_rule->max_eirp); | |
686 | } | |
687 | } | |
688 | ||
a3d2eaf0 | 689 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
690 | { |
691 | ||
692 | if (is_world_regdom(rd->alpha2)) | |
693 | printk(KERN_INFO "cfg80211: World regulatory " | |
694 | "domain updated:\n"); | |
695 | else { | |
696 | if (is_unknown_alpha2(rd->alpha2)) | |
697 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
698 | "changed to driver built-in settings " | |
699 | "(unknown country)\n"); | |
700 | else | |
701 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
702 | "changed to country: %c%c\n", | |
703 | rd->alpha2[0], rd->alpha2[1]); | |
704 | } | |
705 | print_rd_rules(rd); | |
706 | } | |
707 | ||
a3d2eaf0 | 708 | void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
709 | { |
710 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
711 | rd->alpha2[0], rd->alpha2[1]); | |
712 | print_rd_rules(rd); | |
713 | } | |
714 | ||
a3d2eaf0 | 715 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
716 | { |
717 | struct regulatory_request *request = NULL; | |
718 | ||
719 | /* Some basic sanity checks first */ | |
720 | ||
b2e1b302 LR |
721 | if (is_world_regdom(rd->alpha2)) { |
722 | if (WARN_ON(!__reg_is_valid_request(rd->alpha2, &request))) | |
723 | return -EINVAL; | |
724 | update_world_regdomain(rd); | |
725 | return 0; | |
726 | } | |
b2e1b302 LR |
727 | |
728 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
729 | !is_unknown_alpha2(rd->alpha2)) | |
730 | return -EINVAL; | |
731 | ||
732 | if (list_empty(®ulatory_requests)) | |
733 | return -EINVAL; | |
734 | ||
942b25cf | 735 | /* allow overriding the static definitions if CRDA is present */ |
b2e1b302 | 736 | if (!is_old_static_regdom(cfg80211_regdomain) && |
942b25cf | 737 | !regdom_changed(rd->alpha2)) |
b2e1b302 | 738 | return -EINVAL; |
b2e1b302 LR |
739 | |
740 | /* Now lets set the regulatory domain, update all driver channels | |
741 | * and finally inform them of what we have done, in case they want | |
742 | * to review or adjust their own settings based on their own | |
743 | * internal EEPROM data */ | |
744 | ||
745 | if (WARN_ON(!__reg_is_valid_request(rd->alpha2, &request))) | |
746 | return -EINVAL; | |
747 | ||
b2e1b302 | 748 | reset_regdomains(); |
b2e1b302 LR |
749 | |
750 | /* Country IE parsing coming soon */ | |
751 | switch (request->initiator) { | |
752 | case REGDOM_SET_BY_CORE: | |
753 | case REGDOM_SET_BY_DRIVER: | |
754 | case REGDOM_SET_BY_USER: | |
755 | if (!is_valid_rd(rd)) { | |
756 | printk(KERN_ERR "cfg80211: Invalid " | |
757 | "regulatory domain detected:\n"); | |
758 | print_regdomain_info(rd); | |
759 | return -EINVAL; | |
760 | } | |
761 | break; | |
762 | case REGDOM_SET_BY_COUNTRY_IE: /* Not yet */ | |
763 | WARN_ON(1); | |
764 | default: | |
765 | return -EOPNOTSUPP; | |
766 | } | |
767 | ||
768 | /* Tada! */ | |
769 | cfg80211_regdomain = rd; | |
770 | request->granted = 1; | |
771 | ||
772 | return 0; | |
773 | } | |
774 | ||
775 | ||
776 | /* Use this call to set the current regulatory domain. Conflicts with | |
777 | * multiple drivers can be ironed out later. Caller must've already | |
778 | * kmalloc'd the rd structure. If this calls fails you should kfree() | |
779 | * the passed rd. Caller must hold cfg80211_drv_mutex */ | |
a3d2eaf0 | 780 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
781 | { |
782 | struct regulatory_request *this_request = NULL, *prev_request = NULL; | |
783 | int r; | |
784 | ||
785 | if (!list_empty(®ulatory_requests)) | |
786 | prev_request = list_first_entry(®ulatory_requests, | |
787 | struct regulatory_request, list); | |
788 | ||
789 | /* Note that this doesn't update the wiphys, this is done below */ | |
790 | r = __set_regdom(rd); | |
791 | if (r) | |
792 | return r; | |
793 | ||
794 | BUG_ON((!__reg_is_valid_request(rd->alpha2, &this_request))); | |
795 | ||
796 | /* The initial standard core update of the world regulatory domain, no | |
797 | * need to keep that request info around if it didn't fail. */ | |
798 | if (is_world_regdom(rd->alpha2) && | |
799 | this_request->initiator == REGDOM_SET_BY_CORE && | |
800 | this_request->granted) { | |
801 | list_del(&this_request->list); | |
802 | kfree(this_request); | |
803 | this_request = NULL; | |
804 | } | |
805 | ||
806 | /* Remove old requests, we only leave behind the last one */ | |
807 | if (prev_request) { | |
808 | list_del(&prev_request->list); | |
809 | kfree(prev_request); | |
810 | prev_request = NULL; | |
811 | } | |
812 | ||
813 | /* This would make this whole thing pointless */ | |
814 | BUG_ON(rd != cfg80211_regdomain); | |
815 | ||
816 | /* update all wiphys now with the new established regulatory domain */ | |
817 | update_all_wiphy_regulatory(this_request->initiator); | |
818 | ||
819 | print_regdomain(rd); | |
820 | ||
821 | return r; | |
822 | } | |
823 | ||
824 | int regulatory_init(void) | |
825 | { | |
734366de JB |
826 | int err; |
827 | ||
b2e1b302 LR |
828 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
829 | if (IS_ERR(reg_pdev)) | |
830 | return PTR_ERR(reg_pdev); | |
734366de JB |
831 | |
832 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
a3d2eaf0 | 833 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 834 | |
942b25cf | 835 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de JB |
836 | print_regdomain_info(cfg80211_regdomain); |
837 | /* The old code still requests for a new regdomain and if | |
838 | * you have CRDA you get it updated, otherwise you get | |
839 | * stuck with the static values. We ignore "EU" code as | |
840 | * that is not a valid ISO / IEC 3166 alpha2 */ | |
841 | if (ieee80211_regdom[0] != 'E' && ieee80211_regdom[1] != 'U') | |
842 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, | |
843 | ieee80211_regdom, NULL); | |
844 | #else | |
a3d2eaf0 | 845 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de JB |
846 | |
847 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00", NULL); | |
848 | if (err) | |
849 | printk(KERN_ERR "cfg80211: calling CRDA failed - " | |
850 | "unable to update world regulatory domain, " | |
851 | "using static definition\n"); | |
852 | #endif | |
853 | ||
b2e1b302 LR |
854 | return 0; |
855 | } | |
856 | ||
857 | void regulatory_exit(void) | |
858 | { | |
859 | struct regulatory_request *req, *req_tmp; | |
734366de | 860 | |
b2e1b302 | 861 | mutex_lock(&cfg80211_drv_mutex); |
734366de | 862 | |
b2e1b302 | 863 | reset_regdomains(); |
734366de | 864 | |
b2e1b302 LR |
865 | list_for_each_entry_safe(req, req_tmp, ®ulatory_requests, list) { |
866 | list_del(&req->list); | |
867 | kfree(req); | |
868 | } | |
869 | platform_device_unregister(reg_pdev); | |
734366de | 870 | |
b2e1b302 | 871 | mutex_unlock(&cfg80211_drv_mutex); |
8318d78a | 872 | } |