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