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1 | /* | |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> | |
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 | ||
12 | /** | |
13 | * DOC: Wireless regulatory infrastructure | |
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 | * | |
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 | * | |
34 | */ | |
35 | #include <linux/kernel.h> | |
36 | #include <linux/list.h> | |
37 | #include <linux/random.h> | |
38 | #include <linux/nl80211.h> | |
39 | #include <linux/platform_device.h> | |
40 | #include <net/wireless.h> | |
41 | #include <net/cfg80211.h> | |
42 | #include "core.h" | |
43 | #include "reg.h" | |
44 | ||
45 | /** | |
46 | * struct regulatory_request - receipt of last regulatory request | |
47 | * | |
48 | * @wiphy: this is set if this request's initiator is | |
49 | * %REGDOM_SET_BY_COUNTRY_IE or %REGDOM_SET_BY_DRIVER. This | |
50 | * can be used by the wireless core to deal with conflicts | |
51 | * and potentially inform users of which devices specifically | |
52 | * cased the conflicts. | |
53 | * @initiator: indicates who sent this request, could be any of | |
54 | * of those set in reg_set_by, %REGDOM_SET_BY_* | |
55 | * @alpha2: the ISO / IEC 3166 alpha2 country code of the requested | |
56 | * regulatory domain. We have a few special codes: | |
57 | * 00 - World regulatory domain | |
58 | * 99 - built by driver but a specific alpha2 cannot be determined | |
59 | * 98 - result of an intersection between two regulatory domains | |
60 | * @intersect: indicates whether the wireless core should intersect | |
61 | * the requested regulatory domain with the presently set regulatory | |
62 | * domain. | |
63 | */ | |
64 | struct regulatory_request { | |
65 | struct wiphy *wiphy; | |
66 | enum reg_set_by initiator; | |
67 | char alpha2[2]; | |
68 | bool intersect; | |
69 | }; | |
70 | ||
71 | /* Receipt of information from last regulatory request */ | |
72 | static struct regulatory_request *last_request; | |
73 | ||
74 | /* To trigger userspace events */ | |
75 | static struct platform_device *reg_pdev; | |
76 | ||
77 | /* Keep the ordering from large to small */ | |
78 | static u32 supported_bandwidths[] = { | |
79 | MHZ_TO_KHZ(40), | |
80 | MHZ_TO_KHZ(20), | |
81 | }; | |
82 | ||
83 | /* Central wireless core regulatory domains, we only need two, | |
84 | * the current one and a world regulatory domain in case we have no | |
85 | * information to give us an alpha2 */ | |
86 | static const struct ieee80211_regdomain *cfg80211_regdomain; | |
87 | ||
88 | /* We keep a static world regulatory domain in case of the absence of CRDA */ | |
89 | static const struct ieee80211_regdomain world_regdom = { | |
90 | .n_reg_rules = 1, | |
91 | .alpha2 = "00", | |
92 | .reg_rules = { | |
93 | REG_RULE(2412-10, 2462+10, 40, 6, 20, | |
94 | NL80211_RRF_PASSIVE_SCAN | | |
95 | NL80211_RRF_NO_IBSS), | |
96 | } | |
97 | }; | |
98 | ||
99 | static const struct ieee80211_regdomain *cfg80211_world_regdom = | |
100 | &world_regdom; | |
101 | ||
102 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
103 | static char *ieee80211_regdom = "US"; | |
104 | module_param(ieee80211_regdom, charp, 0444); | |
105 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
106 | ||
107 | /* We assume 40 MHz bandwidth for the old regulatory work. | |
108 | * We make emphasis we are using the exact same frequencies | |
109 | * as before */ | |
110 | ||
111 | static const struct ieee80211_regdomain us_regdom = { | |
112 | .n_reg_rules = 6, | |
113 | .alpha2 = "US", | |
114 | .reg_rules = { | |
115 | /* IEEE 802.11b/g, channels 1..11 */ | |
116 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
117 | /* IEEE 802.11a, channel 36 */ | |
118 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
119 | /* IEEE 802.11a, channel 40 */ | |
120 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
121 | /* IEEE 802.11a, channel 44 */ | |
122 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
123 | /* IEEE 802.11a, channels 48..64 */ | |
124 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
125 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
126 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
127 | } | |
128 | }; | |
129 | ||
130 | static const struct ieee80211_regdomain jp_regdom = { | |
131 | .n_reg_rules = 3, | |
132 | .alpha2 = "JP", | |
133 | .reg_rules = { | |
134 | /* IEEE 802.11b/g, channels 1..14 */ | |
135 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
136 | /* IEEE 802.11a, channels 34..48 */ | |
137 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
138 | NL80211_RRF_PASSIVE_SCAN), | |
139 | /* IEEE 802.11a, channels 52..64 */ | |
140 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
141 | NL80211_RRF_NO_IBSS | | |
142 | NL80211_RRF_DFS), | |
143 | } | |
144 | }; | |
145 | ||
146 | static const struct ieee80211_regdomain eu_regdom = { | |
147 | .n_reg_rules = 6, | |
148 | /* This alpha2 is bogus, we leave it here just for stupid | |
149 | * backward compatibility */ | |
150 | .alpha2 = "EU", | |
151 | .reg_rules = { | |
152 | /* IEEE 802.11b/g, channels 1..13 */ | |
153 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
154 | /* IEEE 802.11a, channel 36 */ | |
155 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
156 | NL80211_RRF_PASSIVE_SCAN), | |
157 | /* IEEE 802.11a, channel 40 */ | |
158 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
159 | NL80211_RRF_PASSIVE_SCAN), | |
160 | /* IEEE 802.11a, channel 44 */ | |
161 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
162 | NL80211_RRF_PASSIVE_SCAN), | |
163 | /* IEEE 802.11a, channels 48..64 */ | |
164 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
165 | NL80211_RRF_NO_IBSS | | |
166 | NL80211_RRF_DFS), | |
167 | /* IEEE 802.11a, channels 100..140 */ | |
168 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
169 | NL80211_RRF_NO_IBSS | | |
170 | NL80211_RRF_DFS), | |
171 | } | |
172 | }; | |
173 | ||
174 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
175 | { | |
176 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
177 | return &us_regdom; | |
178 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
179 | return &jp_regdom; | |
180 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
181 | return &eu_regdom; | |
182 | /* Default, as per the old rules */ | |
183 | return &us_regdom; | |
184 | } | |
185 | ||
186 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
187 | { | |
188 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
189 | return true; | |
190 | return false; | |
191 | } | |
192 | #else | |
193 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
194 | { | |
195 | return false; | |
196 | } | |
197 | #endif | |
198 | ||
199 | static void reset_regdomains(void) | |
200 | { | |
201 | /* avoid freeing static information or freeing something twice */ | |
202 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
203 | cfg80211_regdomain = NULL; | |
204 | if (cfg80211_world_regdom == &world_regdom) | |
205 | cfg80211_world_regdom = NULL; | |
206 | if (cfg80211_regdomain == &world_regdom) | |
207 | cfg80211_regdomain = NULL; | |
208 | if (is_old_static_regdom(cfg80211_regdomain)) | |
209 | cfg80211_regdomain = NULL; | |
210 | ||
211 | kfree(cfg80211_regdomain); | |
212 | kfree(cfg80211_world_regdom); | |
213 | ||
214 | cfg80211_world_regdom = &world_regdom; | |
215 | cfg80211_regdomain = NULL; | |
216 | } | |
217 | ||
218 | /* Dynamic world regulatory domain requested by the wireless | |
219 | * core upon initialization */ | |
220 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) | |
221 | { | |
222 | BUG_ON(!last_request); | |
223 | ||
224 | reset_regdomains(); | |
225 | ||
226 | cfg80211_world_regdom = rd; | |
227 | cfg80211_regdomain = rd; | |
228 | } | |
229 | ||
230 | bool is_world_regdom(const char *alpha2) | |
231 | { | |
232 | if (!alpha2) | |
233 | return false; | |
234 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
235 | return true; | |
236 | return false; | |
237 | } | |
238 | ||
239 | static bool is_alpha2_set(const char *alpha2) | |
240 | { | |
241 | if (!alpha2) | |
242 | return false; | |
243 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
244 | return true; | |
245 | return false; | |
246 | } | |
247 | ||
248 | static bool is_alpha_upper(char letter) | |
249 | { | |
250 | /* ASCII A - Z */ | |
251 | if (letter >= 65 && letter <= 90) | |
252 | return true; | |
253 | return false; | |
254 | } | |
255 | ||
256 | static bool is_unknown_alpha2(const char *alpha2) | |
257 | { | |
258 | if (!alpha2) | |
259 | return false; | |
260 | /* Special case where regulatory domain was built by driver | |
261 | * but a specific alpha2 cannot be determined */ | |
262 | if (alpha2[0] == '9' && alpha2[1] == '9') | |
263 | return true; | |
264 | return false; | |
265 | } | |
266 | ||
267 | static bool is_an_alpha2(const char *alpha2) | |
268 | { | |
269 | if (!alpha2) | |
270 | return false; | |
271 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
272 | return true; | |
273 | return false; | |
274 | } | |
275 | ||
276 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) | |
277 | { | |
278 | if (!alpha2_x || !alpha2_y) | |
279 | return false; | |
280 | if (alpha2_x[0] == alpha2_y[0] && | |
281 | alpha2_x[1] == alpha2_y[1]) | |
282 | return true; | |
283 | return false; | |
284 | } | |
285 | ||
286 | static bool regdom_changed(const char *alpha2) | |
287 | { | |
288 | if (!cfg80211_regdomain) | |
289 | return true; | |
290 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
291 | return false; | |
292 | return true; | |
293 | } | |
294 | ||
295 | /* This lets us keep regulatory code which is updated on a regulatory | |
296 | * basis in userspace. */ | |
297 | static int call_crda(const char *alpha2) | |
298 | { | |
299 | char country_env[9 + 2] = "COUNTRY="; | |
300 | char *envp[] = { | |
301 | country_env, | |
302 | NULL | |
303 | }; | |
304 | ||
305 | if (!is_world_regdom((char *) alpha2)) | |
306 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
307 | alpha2[0], alpha2[1]); | |
308 | else | |
309 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " | |
310 | "regulatory domain\n"); | |
311 | ||
312 | country_env[8] = alpha2[0]; | |
313 | country_env[9] = alpha2[1]; | |
314 | ||
315 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
316 | } | |
317 | ||
318 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ | |
319 | bool reg_is_valid_request(const char *alpha2) | |
320 | { | |
321 | if (!last_request) | |
322 | return false; | |
323 | ||
324 | return alpha2_equal(last_request->alpha2, alpha2); | |
325 | } | |
326 | ||
327 | /* Sanity check on a regulatory rule */ | |
328 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) | |
329 | { | |
330 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; | |
331 | u32 freq_diff; | |
332 | ||
333 | if (freq_range->start_freq_khz == 0 || freq_range->end_freq_khz == 0) | |
334 | return false; | |
335 | ||
336 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
337 | return false; | |
338 | ||
339 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
340 | ||
341 | if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff) | |
342 | return false; | |
343 | ||
344 | return true; | |
345 | } | |
346 | ||
347 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) | |
348 | { | |
349 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
350 | unsigned int i; | |
351 | ||
352 | if (!rd->n_reg_rules) | |
353 | return false; | |
354 | ||
355 | for (i = 0; i < rd->n_reg_rules; i++) { | |
356 | reg_rule = &rd->reg_rules[i]; | |
357 | if (!is_valid_reg_rule(reg_rule)) | |
358 | return false; | |
359 | } | |
360 | ||
361 | return true; | |
362 | } | |
363 | ||
364 | /* Returns value in KHz */ | |
365 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
366 | u32 freq) | |
367 | { | |
368 | unsigned int i; | |
369 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
370 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
371 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
372 | if (start_freq_khz >= freq_range->start_freq_khz && | |
373 | end_freq_khz <= freq_range->end_freq_khz) | |
374 | return supported_bandwidths[i]; | |
375 | } | |
376 | return 0; | |
377 | } | |
378 | ||
379 | /* Helper for regdom_intersect(), this does the real | |
380 | * mathematical intersection fun */ | |
381 | static int reg_rules_intersect( | |
382 | const struct ieee80211_reg_rule *rule1, | |
383 | const struct ieee80211_reg_rule *rule2, | |
384 | struct ieee80211_reg_rule *intersected_rule) | |
385 | { | |
386 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
387 | struct ieee80211_freq_range *freq_range; | |
388 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
389 | struct ieee80211_power_rule *power_rule; | |
390 | u32 freq_diff; | |
391 | ||
392 | freq_range1 = &rule1->freq_range; | |
393 | freq_range2 = &rule2->freq_range; | |
394 | freq_range = &intersected_rule->freq_range; | |
395 | ||
396 | power_rule1 = &rule1->power_rule; | |
397 | power_rule2 = &rule2->power_rule; | |
398 | power_rule = &intersected_rule->power_rule; | |
399 | ||
400 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
401 | freq_range2->start_freq_khz); | |
402 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
403 | freq_range2->end_freq_khz); | |
404 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
405 | freq_range2->max_bandwidth_khz); | |
406 | ||
407 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
408 | if (freq_range->max_bandwidth_khz > freq_diff) | |
409 | freq_range->max_bandwidth_khz = freq_diff; | |
410 | ||
411 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
412 | power_rule2->max_eirp); | |
413 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
414 | power_rule2->max_antenna_gain); | |
415 | ||
416 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
417 | ||
418 | if (!is_valid_reg_rule(intersected_rule)) | |
419 | return -EINVAL; | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | /** | |
425 | * regdom_intersect - do the intersection between two regulatory domains | |
426 | * @rd1: first regulatory domain | |
427 | * @rd2: second regulatory domain | |
428 | * | |
429 | * Use this function to get the intersection between two regulatory domains. | |
430 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
431 | * as no one single alpha2 can represent this regulatory domain. | |
432 | * | |
433 | * Returns a pointer to the regulatory domain structure which will hold the | |
434 | * resulting intersection of rules between rd1 and rd2. We will | |
435 | * kzalloc() this structure for you. | |
436 | */ | |
437 | static struct ieee80211_regdomain *regdom_intersect( | |
438 | const struct ieee80211_regdomain *rd1, | |
439 | const struct ieee80211_regdomain *rd2) | |
440 | { | |
441 | int r, size_of_regd; | |
442 | unsigned int x, y; | |
443 | unsigned int num_rules = 0, rule_idx = 0; | |
444 | const struct ieee80211_reg_rule *rule1, *rule2; | |
445 | struct ieee80211_reg_rule *intersected_rule; | |
446 | struct ieee80211_regdomain *rd; | |
447 | /* This is just a dummy holder to help us count */ | |
448 | struct ieee80211_reg_rule irule; | |
449 | ||
450 | /* Uses the stack temporarily for counter arithmetic */ | |
451 | intersected_rule = &irule; | |
452 | ||
453 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
454 | ||
455 | if (!rd1 || !rd2) | |
456 | return NULL; | |
457 | ||
458 | /* First we get a count of the rules we'll need, then we actually | |
459 | * build them. This is to so we can malloc() and free() a | |
460 | * regdomain once. The reason we use reg_rules_intersect() here | |
461 | * is it will return -EINVAL if the rule computed makes no sense. | |
462 | * All rules that do check out OK are valid. */ | |
463 | ||
464 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
465 | rule1 = &rd1->reg_rules[x]; | |
466 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
467 | rule2 = &rd2->reg_rules[y]; | |
468 | if (!reg_rules_intersect(rule1, rule2, | |
469 | intersected_rule)) | |
470 | num_rules++; | |
471 | memset(intersected_rule, 0, | |
472 | sizeof(struct ieee80211_reg_rule)); | |
473 | } | |
474 | } | |
475 | ||
476 | if (!num_rules) | |
477 | return NULL; | |
478 | ||
479 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
480 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
481 | ||
482 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
483 | if (!rd) | |
484 | return NULL; | |
485 | ||
486 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
487 | rule1 = &rd1->reg_rules[x]; | |
488 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
489 | rule2 = &rd2->reg_rules[y]; | |
490 | /* This time around instead of using the stack lets | |
491 | * write to the target rule directly saving ourselves | |
492 | * a memcpy() */ | |
493 | intersected_rule = &rd->reg_rules[rule_idx]; | |
494 | r = reg_rules_intersect(rule1, rule2, | |
495 | intersected_rule); | |
496 | /* No need to memset here the intersected rule here as | |
497 | * we're not using the stack anymore */ | |
498 | if (r) | |
499 | continue; | |
500 | rule_idx++; | |
501 | } | |
502 | } | |
503 | ||
504 | if (rule_idx != num_rules) { | |
505 | kfree(rd); | |
506 | return NULL; | |
507 | } | |
508 | ||
509 | rd->n_reg_rules = num_rules; | |
510 | rd->alpha2[0] = '9'; | |
511 | rd->alpha2[1] = '8'; | |
512 | ||
513 | return rd; | |
514 | } | |
515 | ||
516 | /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
517 | * want to just have the channel structure use these */ | |
518 | static u32 map_regdom_flags(u32 rd_flags) | |
519 | { | |
520 | u32 channel_flags = 0; | |
521 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
522 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
523 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
524 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
525 | if (rd_flags & NL80211_RRF_DFS) | |
526 | channel_flags |= IEEE80211_CHAN_RADAR; | |
527 | return channel_flags; | |
528 | } | |
529 | ||
530 | /** | |
531 | * freq_reg_info - get regulatory information for the given frequency | |
532 | * @center_freq: Frequency in KHz for which we want regulatory information for | |
533 | * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one | |
534 | * you can set this to 0. If this frequency is allowed we then set | |
535 | * this value to the maximum allowed bandwidth. | |
536 | * @reg_rule: the regulatory rule which we have for this frequency | |
537 | * | |
538 | * Use this function to get the regulatory rule for a specific frequency. | |
539 | */ | |
540 | static int freq_reg_info(u32 center_freq, u32 *bandwidth, | |
541 | const struct ieee80211_reg_rule **reg_rule) | |
542 | { | |
543 | int i; | |
544 | u32 max_bandwidth = 0; | |
545 | ||
546 | if (!cfg80211_regdomain) | |
547 | return -EINVAL; | |
548 | ||
549 | for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) { | |
550 | const struct ieee80211_reg_rule *rr; | |
551 | const struct ieee80211_freq_range *fr = NULL; | |
552 | const struct ieee80211_power_rule *pr = NULL; | |
553 | ||
554 | rr = &cfg80211_regdomain->reg_rules[i]; | |
555 | fr = &rr->freq_range; | |
556 | pr = &rr->power_rule; | |
557 | max_bandwidth = freq_max_bandwidth(fr, center_freq); | |
558 | if (max_bandwidth && *bandwidth <= max_bandwidth) { | |
559 | *reg_rule = rr; | |
560 | *bandwidth = max_bandwidth; | |
561 | break; | |
562 | } | |
563 | } | |
564 | ||
565 | return !max_bandwidth; | |
566 | } | |
567 | ||
568 | static void handle_channel(struct ieee80211_channel *chan) | |
569 | { | |
570 | int r; | |
571 | u32 flags = chan->orig_flags; | |
572 | u32 max_bandwidth = 0; | |
573 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
574 | const struct ieee80211_power_rule *power_rule = NULL; | |
575 | ||
576 | r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq), | |
577 | &max_bandwidth, ®_rule); | |
578 | ||
579 | if (r) { | |
580 | flags |= IEEE80211_CHAN_DISABLED; | |
581 | chan->flags = flags; | |
582 | return; | |
583 | } | |
584 | ||
585 | power_rule = ®_rule->power_rule; | |
586 | ||
587 | chan->flags = flags | map_regdom_flags(reg_rule->flags); | |
588 | chan->max_antenna_gain = min(chan->orig_mag, | |
589 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); | |
590 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
591 | if (chan->orig_mpwr) | |
592 | chan->max_power = min(chan->orig_mpwr, | |
593 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
594 | else | |
595 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
596 | } | |
597 | ||
598 | static void handle_band(struct ieee80211_supported_band *sband) | |
599 | { | |
600 | int i; | |
601 | ||
602 | for (i = 0; i < sband->n_channels; i++) | |
603 | handle_channel(&sband->channels[i]); | |
604 | } | |
605 | ||
606 | static void update_all_wiphy_regulatory(enum reg_set_by setby) | |
607 | { | |
608 | struct cfg80211_registered_device *drv; | |
609 | ||
610 | list_for_each_entry(drv, &cfg80211_drv_list, list) | |
611 | wiphy_update_regulatory(&drv->wiphy, setby); | |
612 | } | |
613 | ||
614 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
615 | { | |
616 | enum ieee80211_band band; | |
617 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
618 | if (wiphy->bands[band]) | |
619 | handle_band(wiphy->bands[band]); | |
620 | if (wiphy->reg_notifier) | |
621 | wiphy->reg_notifier(wiphy, setby); | |
622 | } | |
623 | } | |
624 | ||
625 | /* Return value which can be used by ignore_request() to indicate | |
626 | * it has been determined we should intersect two regulatory domains */ | |
627 | #define REG_INTERSECT 1 | |
628 | ||
629 | /* This has the logic which determines when a new request | |
630 | * should be ignored. */ | |
631 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
632 | const char *alpha2) | |
633 | { | |
634 | /* All initial requests are respected */ | |
635 | if (!last_request) | |
636 | return 0; | |
637 | ||
638 | switch (set_by) { | |
639 | case REGDOM_SET_BY_INIT: | |
640 | return -EINVAL; | |
641 | case REGDOM_SET_BY_CORE: | |
642 | /* | |
643 | * Always respect new wireless core hints, should only happen | |
644 | * when updating the world regulatory domain at init. | |
645 | */ | |
646 | return 0; | |
647 | case REGDOM_SET_BY_COUNTRY_IE: | |
648 | if (unlikely(!is_an_alpha2(alpha2))) | |
649 | return -EINVAL; | |
650 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
651 | if (last_request->wiphy != wiphy) { | |
652 | /* | |
653 | * Two cards with two APs claiming different | |
654 | * different Country IE alpha2s. We could | |
655 | * intersect them, but that seems unlikely | |
656 | * to be correct. Reject second one for now. | |
657 | */ | |
658 | if (!alpha2_equal(alpha2, | |
659 | cfg80211_regdomain->alpha2)) | |
660 | return -EOPNOTSUPP; | |
661 | return -EALREADY; | |
662 | } | |
663 | /* Two consecutive Country IE hints on the same wiphy */ | |
664 | if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
665 | return 0; | |
666 | return -EALREADY; | |
667 | } | |
668 | /* | |
669 | * Ignore Country IE hints for now, need to think about | |
670 | * what we need to do to support multi-domain operation. | |
671 | */ | |
672 | return -EOPNOTSUPP; | |
673 | case REGDOM_SET_BY_DRIVER: | |
674 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) | |
675 | return -EALREADY; | |
676 | return 0; | |
677 | case REGDOM_SET_BY_USER: | |
678 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
679 | return REG_INTERSECT; | |
680 | return 0; | |
681 | } | |
682 | ||
683 | return -EINVAL; | |
684 | } | |
685 | ||
686 | /* Caller must hold &cfg80211_drv_mutex */ | |
687 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, | |
688 | const char *alpha2) | |
689 | { | |
690 | struct regulatory_request *request; | |
691 | bool intersect = false; | |
692 | int r = 0; | |
693 | ||
694 | r = ignore_request(wiphy, set_by, alpha2); | |
695 | ||
696 | if (r == REG_INTERSECT) | |
697 | intersect = true; | |
698 | else if (r) | |
699 | return r; | |
700 | ||
701 | switch (set_by) { | |
702 | case REGDOM_SET_BY_CORE: | |
703 | case REGDOM_SET_BY_COUNTRY_IE: | |
704 | case REGDOM_SET_BY_DRIVER: | |
705 | case REGDOM_SET_BY_USER: | |
706 | request = kzalloc(sizeof(struct regulatory_request), | |
707 | GFP_KERNEL); | |
708 | if (!request) | |
709 | return -ENOMEM; | |
710 | ||
711 | request->alpha2[0] = alpha2[0]; | |
712 | request->alpha2[1] = alpha2[1]; | |
713 | request->initiator = set_by; | |
714 | request->wiphy = wiphy; | |
715 | request->intersect = intersect; | |
716 | ||
717 | kfree(last_request); | |
718 | last_request = request; | |
719 | r = call_crda(alpha2); | |
720 | #ifndef CONFIG_WIRELESS_OLD_REGULATORY | |
721 | if (r) | |
722 | printk(KERN_ERR "cfg80211: Failed calling CRDA\n"); | |
723 | #endif | |
724 | break; | |
725 | default: | |
726 | r = -ENOTSUPP; | |
727 | break; | |
728 | } | |
729 | ||
730 | return r; | |
731 | } | |
732 | ||
733 | void regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
734 | { | |
735 | BUG_ON(!alpha2); | |
736 | ||
737 | mutex_lock(&cfg80211_drv_mutex); | |
738 | __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2); | |
739 | mutex_unlock(&cfg80211_drv_mutex); | |
740 | } | |
741 | EXPORT_SYMBOL(regulatory_hint); | |
742 | ||
743 | ||
744 | static void print_rd_rules(const struct ieee80211_regdomain *rd) | |
745 | { | |
746 | unsigned int i; | |
747 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
748 | const struct ieee80211_freq_range *freq_range = NULL; | |
749 | const struct ieee80211_power_rule *power_rule = NULL; | |
750 | ||
751 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
752 | "(max_antenna_gain, max_eirp)\n"); | |
753 | ||
754 | for (i = 0; i < rd->n_reg_rules; i++) { | |
755 | reg_rule = &rd->reg_rules[i]; | |
756 | freq_range = ®_rule->freq_range; | |
757 | power_rule = ®_rule->power_rule; | |
758 | ||
759 | /* There may not be documentation for max antenna gain | |
760 | * in certain regions */ | |
761 | if (power_rule->max_antenna_gain) | |
762 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
763 | "(%d mBi, %d mBm)\n", | |
764 | freq_range->start_freq_khz, | |
765 | freq_range->end_freq_khz, | |
766 | freq_range->max_bandwidth_khz, | |
767 | power_rule->max_antenna_gain, | |
768 | power_rule->max_eirp); | |
769 | else | |
770 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
771 | "(N/A, %d mBm)\n", | |
772 | freq_range->start_freq_khz, | |
773 | freq_range->end_freq_khz, | |
774 | freq_range->max_bandwidth_khz, | |
775 | power_rule->max_eirp); | |
776 | } | |
777 | } | |
778 | ||
779 | static void print_regdomain(const struct ieee80211_regdomain *rd) | |
780 | { | |
781 | ||
782 | if (is_world_regdom(rd->alpha2)) | |
783 | printk(KERN_INFO "cfg80211: World regulatory " | |
784 | "domain updated:\n"); | |
785 | else { | |
786 | if (is_unknown_alpha2(rd->alpha2)) | |
787 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
788 | "changed to driver built-in settings " | |
789 | "(unknown country)\n"); | |
790 | else | |
791 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
792 | "changed to country: %c%c\n", | |
793 | rd->alpha2[0], rd->alpha2[1]); | |
794 | } | |
795 | print_rd_rules(rd); | |
796 | } | |
797 | ||
798 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) | |
799 | { | |
800 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
801 | rd->alpha2[0], rd->alpha2[1]); | |
802 | print_rd_rules(rd); | |
803 | } | |
804 | ||
805 | /* Takes ownership of rd only if it doesn't fail */ | |
806 | static int __set_regdom(const struct ieee80211_regdomain *rd) | |
807 | { | |
808 | const struct ieee80211_regdomain *intersected_rd = NULL; | |
809 | /* Some basic sanity checks first */ | |
810 | ||
811 | if (is_world_regdom(rd->alpha2)) { | |
812 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) | |
813 | return -EINVAL; | |
814 | update_world_regdomain(rd); | |
815 | return 0; | |
816 | } | |
817 | ||
818 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
819 | !is_unknown_alpha2(rd->alpha2)) | |
820 | return -EINVAL; | |
821 | ||
822 | if (!last_request) | |
823 | return -EINVAL; | |
824 | ||
825 | /* allow overriding the static definitions if CRDA is present */ | |
826 | if (!is_old_static_regdom(cfg80211_regdomain) && | |
827 | !regdom_changed(rd->alpha2)) | |
828 | return -EINVAL; | |
829 | ||
830 | /* Now lets set the regulatory domain, update all driver channels | |
831 | * and finally inform them of what we have done, in case they want | |
832 | * to review or adjust their own settings based on their own | |
833 | * internal EEPROM data */ | |
834 | ||
835 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) | |
836 | return -EINVAL; | |
837 | ||
838 | reset_regdomains(); | |
839 | ||
840 | /* Country IE parsing coming soon */ | |
841 | switch (last_request->initiator) { | |
842 | case REGDOM_SET_BY_CORE: | |
843 | case REGDOM_SET_BY_DRIVER: | |
844 | case REGDOM_SET_BY_USER: | |
845 | if (!is_valid_rd(rd)) { | |
846 | printk(KERN_ERR "cfg80211: Invalid " | |
847 | "regulatory domain detected:\n"); | |
848 | print_regdomain_info(rd); | |
849 | return -EINVAL; | |
850 | } | |
851 | break; | |
852 | case REGDOM_SET_BY_COUNTRY_IE: /* Not yet */ | |
853 | WARN_ON(1); | |
854 | default: | |
855 | return -EOPNOTSUPP; | |
856 | } | |
857 | ||
858 | if (unlikely(last_request->intersect)) { | |
859 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); | |
860 | if (!intersected_rd) | |
861 | return -EINVAL; | |
862 | kfree(rd); | |
863 | rd = intersected_rd; | |
864 | } | |
865 | ||
866 | /* Tada! */ | |
867 | cfg80211_regdomain = rd; | |
868 | ||
869 | return 0; | |
870 | } | |
871 | ||
872 | ||
873 | /* Use this call to set the current regulatory domain. Conflicts with | |
874 | * multiple drivers can be ironed out later. Caller must've already | |
875 | * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */ | |
876 | int set_regdom(const struct ieee80211_regdomain *rd) | |
877 | { | |
878 | int r; | |
879 | ||
880 | /* Note that this doesn't update the wiphys, this is done below */ | |
881 | r = __set_regdom(rd); | |
882 | if (r) { | |
883 | kfree(rd); | |
884 | return r; | |
885 | } | |
886 | ||
887 | /* This would make this whole thing pointless */ | |
888 | BUG_ON(rd != cfg80211_regdomain); | |
889 | ||
890 | /* update all wiphys now with the new established regulatory domain */ | |
891 | update_all_wiphy_regulatory(last_request->initiator); | |
892 | ||
893 | print_regdomain(rd); | |
894 | ||
895 | return r; | |
896 | } | |
897 | ||
898 | int regulatory_init(void) | |
899 | { | |
900 | int err; | |
901 | ||
902 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); | |
903 | if (IS_ERR(reg_pdev)) | |
904 | return PTR_ERR(reg_pdev); | |
905 | ||
906 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
907 | cfg80211_regdomain = static_regdom(ieee80211_regdom); | |
908 | ||
909 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); | |
910 | print_regdomain_info(cfg80211_regdomain); | |
911 | /* The old code still requests for a new regdomain and if | |
912 | * you have CRDA you get it updated, otherwise you get | |
913 | * stuck with the static values. We ignore "EU" code as | |
914 | * that is not a valid ISO / IEC 3166 alpha2 */ | |
915 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') | |
916 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, | |
917 | ieee80211_regdom); | |
918 | #else | |
919 | cfg80211_regdomain = cfg80211_world_regdom; | |
920 | ||
921 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00"); | |
922 | if (err) | |
923 | printk(KERN_ERR "cfg80211: calling CRDA failed - " | |
924 | "unable to update world regulatory domain, " | |
925 | "using static definition\n"); | |
926 | #endif | |
927 | ||
928 | return 0; | |
929 | } | |
930 | ||
931 | void regulatory_exit(void) | |
932 | { | |
933 | mutex_lock(&cfg80211_drv_mutex); | |
934 | ||
935 | reset_regdomains(); | |
936 | ||
937 | kfree(last_request); | |
938 | ||
939 | platform_device_unregister(reg_pdev); | |
940 | ||
941 | mutex_unlock(&cfg80211_drv_mutex); | |
942 | } |