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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 | * @country_ie_checksum: checksum of the last processed and accepted | |
64 | * country IE | |
65 | * @country_ie_env: lets us know if the AP is telling us we are outdoor, | |
66 | * indoor, or if it doesn't matter | |
67 | */ | |
68 | struct regulatory_request { | |
69 | struct wiphy *wiphy; | |
70 | enum reg_set_by initiator; | |
71 | char alpha2[2]; | |
72 | bool intersect; | |
73 | u32 country_ie_checksum; | |
74 | enum environment_cap country_ie_env; | |
75 | }; | |
76 | ||
77 | /* Receipt of information from last regulatory request */ | |
78 | static struct regulatory_request *last_request; | |
79 | ||
80 | /* To trigger userspace events */ | |
81 | static struct platform_device *reg_pdev; | |
82 | ||
83 | /* Keep the ordering from large to small */ | |
84 | static u32 supported_bandwidths[] = { | |
85 | MHZ_TO_KHZ(40), | |
86 | MHZ_TO_KHZ(20), | |
87 | }; | |
88 | ||
89 | /* Central wireless core regulatory domains, we only need two, | |
90 | * the current one and a world regulatory domain in case we have no | |
91 | * information to give us an alpha2 */ | |
92 | static const struct ieee80211_regdomain *cfg80211_regdomain; | |
93 | ||
94 | /* We use this as a place for the rd structure built from the | |
95 | * last parsed country IE to rest until CRDA gets back to us with | |
96 | * what it thinks should apply for the same country */ | |
97 | static const struct ieee80211_regdomain *country_ie_regdomain; | |
98 | ||
99 | /* We keep a static world regulatory domain in case of the absence of CRDA */ | |
100 | static const struct ieee80211_regdomain world_regdom = { | |
101 | .n_reg_rules = 1, | |
102 | .alpha2 = "00", | |
103 | .reg_rules = { | |
104 | REG_RULE(2412-10, 2462+10, 40, 6, 20, | |
105 | NL80211_RRF_PASSIVE_SCAN | | |
106 | NL80211_RRF_NO_IBSS), | |
107 | } | |
108 | }; | |
109 | ||
110 | static const struct ieee80211_regdomain *cfg80211_world_regdom = | |
111 | &world_regdom; | |
112 | ||
113 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
114 | static char *ieee80211_regdom = "US"; | |
115 | module_param(ieee80211_regdom, charp, 0444); | |
116 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
117 | ||
118 | /* We assume 40 MHz bandwidth for the old regulatory work. | |
119 | * We make emphasis we are using the exact same frequencies | |
120 | * as before */ | |
121 | ||
122 | static const struct ieee80211_regdomain us_regdom = { | |
123 | .n_reg_rules = 6, | |
124 | .alpha2 = "US", | |
125 | .reg_rules = { | |
126 | /* IEEE 802.11b/g, channels 1..11 */ | |
127 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
128 | /* IEEE 802.11a, channel 36 */ | |
129 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
130 | /* IEEE 802.11a, channel 40 */ | |
131 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
132 | /* IEEE 802.11a, channel 44 */ | |
133 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
134 | /* IEEE 802.11a, channels 48..64 */ | |
135 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
136 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
137 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
138 | } | |
139 | }; | |
140 | ||
141 | static const struct ieee80211_regdomain jp_regdom = { | |
142 | .n_reg_rules = 3, | |
143 | .alpha2 = "JP", | |
144 | .reg_rules = { | |
145 | /* IEEE 802.11b/g, channels 1..14 */ | |
146 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
147 | /* IEEE 802.11a, channels 34..48 */ | |
148 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
149 | NL80211_RRF_PASSIVE_SCAN), | |
150 | /* IEEE 802.11a, channels 52..64 */ | |
151 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
152 | NL80211_RRF_NO_IBSS | | |
153 | NL80211_RRF_DFS), | |
154 | } | |
155 | }; | |
156 | ||
157 | static const struct ieee80211_regdomain eu_regdom = { | |
158 | .n_reg_rules = 6, | |
159 | /* This alpha2 is bogus, we leave it here just for stupid | |
160 | * backward compatibility */ | |
161 | .alpha2 = "EU", | |
162 | .reg_rules = { | |
163 | /* IEEE 802.11b/g, channels 1..13 */ | |
164 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
165 | /* IEEE 802.11a, channel 36 */ | |
166 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
167 | NL80211_RRF_PASSIVE_SCAN), | |
168 | /* IEEE 802.11a, channel 40 */ | |
169 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
170 | NL80211_RRF_PASSIVE_SCAN), | |
171 | /* IEEE 802.11a, channel 44 */ | |
172 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
173 | NL80211_RRF_PASSIVE_SCAN), | |
174 | /* IEEE 802.11a, channels 48..64 */ | |
175 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
176 | NL80211_RRF_NO_IBSS | | |
177 | NL80211_RRF_DFS), | |
178 | /* IEEE 802.11a, channels 100..140 */ | |
179 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
180 | NL80211_RRF_NO_IBSS | | |
181 | NL80211_RRF_DFS), | |
182 | } | |
183 | }; | |
184 | ||
185 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
186 | { | |
187 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
188 | return &us_regdom; | |
189 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
190 | return &jp_regdom; | |
191 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
192 | return &eu_regdom; | |
193 | /* Default, as per the old rules */ | |
194 | return &us_regdom; | |
195 | } | |
196 | ||
197 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
198 | { | |
199 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
200 | return true; | |
201 | return false; | |
202 | } | |
203 | #else | |
204 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
205 | { | |
206 | return false; | |
207 | } | |
208 | #endif | |
209 | ||
210 | static void reset_regdomains(void) | |
211 | { | |
212 | /* avoid freeing static information or freeing something twice */ | |
213 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
214 | cfg80211_regdomain = NULL; | |
215 | if (cfg80211_world_regdom == &world_regdom) | |
216 | cfg80211_world_regdom = NULL; | |
217 | if (cfg80211_regdomain == &world_regdom) | |
218 | cfg80211_regdomain = NULL; | |
219 | if (is_old_static_regdom(cfg80211_regdomain)) | |
220 | cfg80211_regdomain = NULL; | |
221 | ||
222 | kfree(cfg80211_regdomain); | |
223 | kfree(cfg80211_world_regdom); | |
224 | ||
225 | cfg80211_world_regdom = &world_regdom; | |
226 | cfg80211_regdomain = NULL; | |
227 | } | |
228 | ||
229 | /* Dynamic world regulatory domain requested by the wireless | |
230 | * core upon initialization */ | |
231 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) | |
232 | { | |
233 | BUG_ON(!last_request); | |
234 | ||
235 | reset_regdomains(); | |
236 | ||
237 | cfg80211_world_regdom = rd; | |
238 | cfg80211_regdomain = rd; | |
239 | } | |
240 | ||
241 | bool is_world_regdom(const char *alpha2) | |
242 | { | |
243 | if (!alpha2) | |
244 | return false; | |
245 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
246 | return true; | |
247 | return false; | |
248 | } | |
249 | ||
250 | static bool is_alpha2_set(const char *alpha2) | |
251 | { | |
252 | if (!alpha2) | |
253 | return false; | |
254 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
255 | return true; | |
256 | return false; | |
257 | } | |
258 | ||
259 | static bool is_alpha_upper(char letter) | |
260 | { | |
261 | /* ASCII A - Z */ | |
262 | if (letter >= 65 && letter <= 90) | |
263 | return true; | |
264 | return false; | |
265 | } | |
266 | ||
267 | static bool is_unknown_alpha2(const char *alpha2) | |
268 | { | |
269 | if (!alpha2) | |
270 | return false; | |
271 | /* Special case where regulatory domain was built by driver | |
272 | * but a specific alpha2 cannot be determined */ | |
273 | if (alpha2[0] == '9' && alpha2[1] == '9') | |
274 | return true; | |
275 | return false; | |
276 | } | |
277 | ||
278 | static bool is_intersected_alpha2(const char *alpha2) | |
279 | { | |
280 | if (!alpha2) | |
281 | return false; | |
282 | /* Special case where regulatory domain is the | |
283 | * result of an intersection between two regulatory domain | |
284 | * structures */ | |
285 | if (alpha2[0] == '9' && alpha2[1] == '8') | |
286 | return true; | |
287 | return false; | |
288 | } | |
289 | ||
290 | static bool is_an_alpha2(const char *alpha2) | |
291 | { | |
292 | if (!alpha2) | |
293 | return false; | |
294 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
295 | return true; | |
296 | return false; | |
297 | } | |
298 | ||
299 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) | |
300 | { | |
301 | if (!alpha2_x || !alpha2_y) | |
302 | return false; | |
303 | if (alpha2_x[0] == alpha2_y[0] && | |
304 | alpha2_x[1] == alpha2_y[1]) | |
305 | return true; | |
306 | return false; | |
307 | } | |
308 | ||
309 | static bool regdom_changed(const char *alpha2) | |
310 | { | |
311 | if (!cfg80211_regdomain) | |
312 | return true; | |
313 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
314 | return false; | |
315 | return true; | |
316 | } | |
317 | ||
318 | /** | |
319 | * country_ie_integrity_changes - tells us if the country IE has changed | |
320 | * @checksum: checksum of country IE of fields we are interested in | |
321 | * | |
322 | * If the country IE has not changed you can ignore it safely. This is | |
323 | * useful to determine if two devices are seeing two different country IEs | |
324 | * even on the same alpha2. Note that this will return false if no IE has | |
325 | * been set on the wireless core yet. | |
326 | */ | |
327 | static bool country_ie_integrity_changes(u32 checksum) | |
328 | { | |
329 | /* If no IE has been set then the checksum doesn't change */ | |
330 | if (unlikely(!last_request->country_ie_checksum)) | |
331 | return false; | |
332 | if (unlikely(last_request->country_ie_checksum != checksum)) | |
333 | return true; | |
334 | return false; | |
335 | } | |
336 | ||
337 | /* This lets us keep regulatory code which is updated on a regulatory | |
338 | * basis in userspace. */ | |
339 | static int call_crda(const char *alpha2) | |
340 | { | |
341 | char country_env[9 + 2] = "COUNTRY="; | |
342 | char *envp[] = { | |
343 | country_env, | |
344 | NULL | |
345 | }; | |
346 | ||
347 | if (!is_world_regdom((char *) alpha2)) | |
348 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
349 | alpha2[0], alpha2[1]); | |
350 | else | |
351 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " | |
352 | "regulatory domain\n"); | |
353 | ||
354 | country_env[8] = alpha2[0]; | |
355 | country_env[9] = alpha2[1]; | |
356 | ||
357 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
358 | } | |
359 | ||
360 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ | |
361 | bool reg_is_valid_request(const char *alpha2) | |
362 | { | |
363 | if (!last_request) | |
364 | return false; | |
365 | ||
366 | return alpha2_equal(last_request->alpha2, alpha2); | |
367 | } | |
368 | ||
369 | /* Sanity check on a regulatory rule */ | |
370 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) | |
371 | { | |
372 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; | |
373 | u32 freq_diff; | |
374 | ||
375 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) | |
376 | return false; | |
377 | ||
378 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
379 | return false; | |
380 | ||
381 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
382 | ||
383 | if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff) | |
384 | return false; | |
385 | ||
386 | return true; | |
387 | } | |
388 | ||
389 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) | |
390 | { | |
391 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
392 | unsigned int i; | |
393 | ||
394 | if (!rd->n_reg_rules) | |
395 | return false; | |
396 | ||
397 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) | |
398 | return false; | |
399 | ||
400 | for (i = 0; i < rd->n_reg_rules; i++) { | |
401 | reg_rule = &rd->reg_rules[i]; | |
402 | if (!is_valid_reg_rule(reg_rule)) | |
403 | return false; | |
404 | } | |
405 | ||
406 | return true; | |
407 | } | |
408 | ||
409 | /* Returns value in KHz */ | |
410 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
411 | u32 freq) | |
412 | { | |
413 | unsigned int i; | |
414 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
415 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
416 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
417 | if (start_freq_khz >= freq_range->start_freq_khz && | |
418 | end_freq_khz <= freq_range->end_freq_khz) | |
419 | return supported_bandwidths[i]; | |
420 | } | |
421 | return 0; | |
422 | } | |
423 | ||
424 | /* Converts a country IE to a regulatory domain. A regulatory domain | |
425 | * structure has a lot of information which the IE doesn't yet have, | |
426 | * so for the other values we use upper max values as we will intersect | |
427 | * with our userspace regulatory agent to get lower bounds. */ | |
428 | static struct ieee80211_regdomain *country_ie_2_rd( | |
429 | u8 *country_ie, | |
430 | u8 country_ie_len, | |
431 | u32 *checksum) | |
432 | { | |
433 | struct ieee80211_regdomain *rd = NULL; | |
434 | unsigned int i = 0; | |
435 | char alpha2[2]; | |
436 | u32 flags = 0; | |
437 | u32 num_rules = 0, size_of_regd = 0; | |
438 | u8 *triplets_start = NULL; | |
439 | u8 len_at_triplet = 0; | |
440 | /* the last channel we have registered in a subband (triplet) */ | |
441 | int last_sub_max_channel = 0; | |
442 | ||
443 | *checksum = 0xDEADBEEF; | |
444 | ||
445 | /* Country IE requirements */ | |
446 | BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN || | |
447 | country_ie_len & 0x01); | |
448 | ||
449 | alpha2[0] = country_ie[0]; | |
450 | alpha2[1] = country_ie[1]; | |
451 | ||
452 | /* | |
453 | * Third octet can be: | |
454 | * 'I' - Indoor | |
455 | * 'O' - Outdoor | |
456 | * | |
457 | * anything else we assume is no restrictions | |
458 | */ | |
459 | if (country_ie[2] == 'I') | |
460 | flags = NL80211_RRF_NO_OUTDOOR; | |
461 | else if (country_ie[2] == 'O') | |
462 | flags = NL80211_RRF_NO_INDOOR; | |
463 | ||
464 | country_ie += 3; | |
465 | country_ie_len -= 3; | |
466 | ||
467 | triplets_start = country_ie; | |
468 | len_at_triplet = country_ie_len; | |
469 | ||
470 | *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8); | |
471 | ||
472 | /* We need to build a reg rule for each triplet, but first we must | |
473 | * calculate the number of reg rules we will need. We will need one | |
474 | * for each channel subband */ | |
475 | while (country_ie_len >= 3) { | |
476 | struct ieee80211_country_ie_triplet *triplet = | |
477 | (struct ieee80211_country_ie_triplet *) country_ie; | |
478 | int cur_sub_max_channel = 0, cur_channel = 0; | |
479 | ||
480 | if (triplet->ext.reg_extension_id >= | |
481 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
482 | country_ie += 3; | |
483 | country_ie_len -= 3; | |
484 | continue; | |
485 | } | |
486 | ||
487 | cur_channel = triplet->chans.first_channel; | |
488 | cur_sub_max_channel = ieee80211_channel_to_frequency( | |
489 | cur_channel + triplet->chans.num_channels); | |
490 | ||
491 | /* Basic sanity check */ | |
492 | if (cur_sub_max_channel < cur_channel) | |
493 | return NULL; | |
494 | ||
495 | /* Do not allow overlapping channels. Also channels | |
496 | * passed in each subband must be monotonically | |
497 | * increasing */ | |
498 | if (last_sub_max_channel) { | |
499 | if (cur_channel <= last_sub_max_channel) | |
500 | return NULL; | |
501 | if (cur_sub_max_channel <= last_sub_max_channel) | |
502 | return NULL; | |
503 | } | |
504 | ||
505 | /* When dot11RegulatoryClassesRequired is supported | |
506 | * we can throw ext triplets as part of this soup, | |
507 | * for now we don't care when those change as we | |
508 | * don't support them */ | |
509 | *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) | | |
510 | ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) | | |
511 | ((triplet->chans.max_power ^ cur_sub_max_channel) << 24); | |
512 | ||
513 | last_sub_max_channel = cur_sub_max_channel; | |
514 | ||
515 | country_ie += 3; | |
516 | country_ie_len -= 3; | |
517 | num_rules++; | |
518 | ||
519 | /* Note: this is not a IEEE requirement but | |
520 | * simply a memory requirement */ | |
521 | if (num_rules > NL80211_MAX_SUPP_REG_RULES) | |
522 | return NULL; | |
523 | } | |
524 | ||
525 | country_ie = triplets_start; | |
526 | country_ie_len = len_at_triplet; | |
527 | ||
528 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
529 | (num_rules * sizeof(struct ieee80211_reg_rule)); | |
530 | ||
531 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
532 | if (!rd) | |
533 | return NULL; | |
534 | ||
535 | rd->n_reg_rules = num_rules; | |
536 | rd->alpha2[0] = alpha2[0]; | |
537 | rd->alpha2[1] = alpha2[1]; | |
538 | ||
539 | /* This time around we fill in the rd */ | |
540 | while (country_ie_len >= 3) { | |
541 | struct ieee80211_country_ie_triplet *triplet = | |
542 | (struct ieee80211_country_ie_triplet *) country_ie; | |
543 | struct ieee80211_reg_rule *reg_rule = NULL; | |
544 | struct ieee80211_freq_range *freq_range = NULL; | |
545 | struct ieee80211_power_rule *power_rule = NULL; | |
546 | ||
547 | /* Must parse if dot11RegulatoryClassesRequired is true, | |
548 | * we don't support this yet */ | |
549 | if (triplet->ext.reg_extension_id >= | |
550 | IEEE80211_COUNTRY_EXTENSION_ID) { | |
551 | country_ie += 3; | |
552 | country_ie_len -= 3; | |
553 | continue; | |
554 | } | |
555 | ||
556 | reg_rule = &rd->reg_rules[i]; | |
557 | freq_range = ®_rule->freq_range; | |
558 | power_rule = ®_rule->power_rule; | |
559 | ||
560 | reg_rule->flags = flags; | |
561 | ||
562 | /* The +10 is since the regulatory domain expects | |
563 | * the actual band edge, not the center of freq for | |
564 | * its start and end freqs, assuming 20 MHz bandwidth on | |
565 | * the channels passed */ | |
566 | freq_range->start_freq_khz = | |
567 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
568 | triplet->chans.first_channel) - 10); | |
569 | freq_range->end_freq_khz = | |
570 | MHZ_TO_KHZ(ieee80211_channel_to_frequency( | |
571 | triplet->chans.first_channel + | |
572 | triplet->chans.num_channels) + 10); | |
573 | ||
574 | /* Large arbitrary values, we intersect later */ | |
575 | /* Increment this if we ever support >= 40 MHz channels | |
576 | * in IEEE 802.11 */ | |
577 | freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40); | |
578 | power_rule->max_antenna_gain = DBI_TO_MBI(100); | |
579 | power_rule->max_eirp = DBM_TO_MBM(100); | |
580 | ||
581 | country_ie += 3; | |
582 | country_ie_len -= 3; | |
583 | i++; | |
584 | ||
585 | BUG_ON(i > NL80211_MAX_SUPP_REG_RULES); | |
586 | } | |
587 | ||
588 | return rd; | |
589 | } | |
590 | ||
591 | ||
592 | /* Helper for regdom_intersect(), this does the real | |
593 | * mathematical intersection fun */ | |
594 | static int reg_rules_intersect( | |
595 | const struct ieee80211_reg_rule *rule1, | |
596 | const struct ieee80211_reg_rule *rule2, | |
597 | struct ieee80211_reg_rule *intersected_rule) | |
598 | { | |
599 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
600 | struct ieee80211_freq_range *freq_range; | |
601 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
602 | struct ieee80211_power_rule *power_rule; | |
603 | u32 freq_diff; | |
604 | ||
605 | freq_range1 = &rule1->freq_range; | |
606 | freq_range2 = &rule2->freq_range; | |
607 | freq_range = &intersected_rule->freq_range; | |
608 | ||
609 | power_rule1 = &rule1->power_rule; | |
610 | power_rule2 = &rule2->power_rule; | |
611 | power_rule = &intersected_rule->power_rule; | |
612 | ||
613 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
614 | freq_range2->start_freq_khz); | |
615 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
616 | freq_range2->end_freq_khz); | |
617 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
618 | freq_range2->max_bandwidth_khz); | |
619 | ||
620 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
621 | if (freq_range->max_bandwidth_khz > freq_diff) | |
622 | freq_range->max_bandwidth_khz = freq_diff; | |
623 | ||
624 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
625 | power_rule2->max_eirp); | |
626 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
627 | power_rule2->max_antenna_gain); | |
628 | ||
629 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
630 | ||
631 | if (!is_valid_reg_rule(intersected_rule)) | |
632 | return -EINVAL; | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | /** | |
638 | * regdom_intersect - do the intersection between two regulatory domains | |
639 | * @rd1: first regulatory domain | |
640 | * @rd2: second regulatory domain | |
641 | * | |
642 | * Use this function to get the intersection between two regulatory domains. | |
643 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
644 | * as no one single alpha2 can represent this regulatory domain. | |
645 | * | |
646 | * Returns a pointer to the regulatory domain structure which will hold the | |
647 | * resulting intersection of rules between rd1 and rd2. We will | |
648 | * kzalloc() this structure for you. | |
649 | */ | |
650 | static struct ieee80211_regdomain *regdom_intersect( | |
651 | const struct ieee80211_regdomain *rd1, | |
652 | const struct ieee80211_regdomain *rd2) | |
653 | { | |
654 | int r, size_of_regd; | |
655 | unsigned int x, y; | |
656 | unsigned int num_rules = 0, rule_idx = 0; | |
657 | const struct ieee80211_reg_rule *rule1, *rule2; | |
658 | struct ieee80211_reg_rule *intersected_rule; | |
659 | struct ieee80211_regdomain *rd; | |
660 | /* This is just a dummy holder to help us count */ | |
661 | struct ieee80211_reg_rule irule; | |
662 | ||
663 | /* Uses the stack temporarily for counter arithmetic */ | |
664 | intersected_rule = &irule; | |
665 | ||
666 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
667 | ||
668 | if (!rd1 || !rd2) | |
669 | return NULL; | |
670 | ||
671 | /* First we get a count of the rules we'll need, then we actually | |
672 | * build them. This is to so we can malloc() and free() a | |
673 | * regdomain once. The reason we use reg_rules_intersect() here | |
674 | * is it will return -EINVAL if the rule computed makes no sense. | |
675 | * All rules that do check out OK are valid. */ | |
676 | ||
677 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
678 | rule1 = &rd1->reg_rules[x]; | |
679 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
680 | rule2 = &rd2->reg_rules[y]; | |
681 | if (!reg_rules_intersect(rule1, rule2, | |
682 | intersected_rule)) | |
683 | num_rules++; | |
684 | memset(intersected_rule, 0, | |
685 | sizeof(struct ieee80211_reg_rule)); | |
686 | } | |
687 | } | |
688 | ||
689 | if (!num_rules) | |
690 | return NULL; | |
691 | ||
692 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
693 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
694 | ||
695 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
696 | if (!rd) | |
697 | return NULL; | |
698 | ||
699 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
700 | rule1 = &rd1->reg_rules[x]; | |
701 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
702 | rule2 = &rd2->reg_rules[y]; | |
703 | /* This time around instead of using the stack lets | |
704 | * write to the target rule directly saving ourselves | |
705 | * a memcpy() */ | |
706 | intersected_rule = &rd->reg_rules[rule_idx]; | |
707 | r = reg_rules_intersect(rule1, rule2, | |
708 | intersected_rule); | |
709 | /* No need to memset here the intersected rule here as | |
710 | * we're not using the stack anymore */ | |
711 | if (r) | |
712 | continue; | |
713 | rule_idx++; | |
714 | } | |
715 | } | |
716 | ||
717 | if (rule_idx != num_rules) { | |
718 | kfree(rd); | |
719 | return NULL; | |
720 | } | |
721 | ||
722 | rd->n_reg_rules = num_rules; | |
723 | rd->alpha2[0] = '9'; | |
724 | rd->alpha2[1] = '8'; | |
725 | ||
726 | return rd; | |
727 | } | |
728 | ||
729 | /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may | |
730 | * want to just have the channel structure use these */ | |
731 | static u32 map_regdom_flags(u32 rd_flags) | |
732 | { | |
733 | u32 channel_flags = 0; | |
734 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
735 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
736 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
737 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
738 | if (rd_flags & NL80211_RRF_DFS) | |
739 | channel_flags |= IEEE80211_CHAN_RADAR; | |
740 | return channel_flags; | |
741 | } | |
742 | ||
743 | /** | |
744 | * freq_reg_info - get regulatory information for the given frequency | |
745 | * @center_freq: Frequency in KHz for which we want regulatory information for | |
746 | * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one | |
747 | * you can set this to 0. If this frequency is allowed we then set | |
748 | * this value to the maximum allowed bandwidth. | |
749 | * @reg_rule: the regulatory rule which we have for this frequency | |
750 | * | |
751 | * Use this function to get the regulatory rule for a specific frequency. | |
752 | */ | |
753 | static int freq_reg_info(u32 center_freq, u32 *bandwidth, | |
754 | const struct ieee80211_reg_rule **reg_rule) | |
755 | { | |
756 | int i; | |
757 | u32 max_bandwidth = 0; | |
758 | ||
759 | if (!cfg80211_regdomain) | |
760 | return -EINVAL; | |
761 | ||
762 | for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) { | |
763 | const struct ieee80211_reg_rule *rr; | |
764 | const struct ieee80211_freq_range *fr = NULL; | |
765 | const struct ieee80211_power_rule *pr = NULL; | |
766 | ||
767 | rr = &cfg80211_regdomain->reg_rules[i]; | |
768 | fr = &rr->freq_range; | |
769 | pr = &rr->power_rule; | |
770 | max_bandwidth = freq_max_bandwidth(fr, center_freq); | |
771 | if (max_bandwidth && *bandwidth <= max_bandwidth) { | |
772 | *reg_rule = rr; | |
773 | *bandwidth = max_bandwidth; | |
774 | break; | |
775 | } | |
776 | } | |
777 | ||
778 | return !max_bandwidth; | |
779 | } | |
780 | ||
781 | static void handle_channel(struct ieee80211_channel *chan) | |
782 | { | |
783 | int r; | |
784 | u32 flags = chan->orig_flags; | |
785 | u32 max_bandwidth = 0; | |
786 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
787 | const struct ieee80211_power_rule *power_rule = NULL; | |
788 | ||
789 | r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq), | |
790 | &max_bandwidth, ®_rule); | |
791 | ||
792 | if (r) { | |
793 | flags |= IEEE80211_CHAN_DISABLED; | |
794 | chan->flags = flags; | |
795 | return; | |
796 | } | |
797 | ||
798 | power_rule = ®_rule->power_rule; | |
799 | ||
800 | chan->flags = flags | map_regdom_flags(reg_rule->flags); | |
801 | chan->max_antenna_gain = min(chan->orig_mag, | |
802 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); | |
803 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
804 | if (chan->orig_mpwr) | |
805 | chan->max_power = min(chan->orig_mpwr, | |
806 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
807 | else | |
808 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); | |
809 | } | |
810 | ||
811 | static void handle_band(struct ieee80211_supported_band *sband) | |
812 | { | |
813 | int i; | |
814 | ||
815 | for (i = 0; i < sband->n_channels; i++) | |
816 | handle_channel(&sband->channels[i]); | |
817 | } | |
818 | ||
819 | static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby) | |
820 | { | |
821 | if (!last_request) | |
822 | return true; | |
823 | if (setby == REGDOM_SET_BY_CORE && | |
824 | wiphy->fw_handles_regulatory) | |
825 | return true; | |
826 | return false; | |
827 | } | |
828 | ||
829 | static void update_all_wiphy_regulatory(enum reg_set_by setby) | |
830 | { | |
831 | struct cfg80211_registered_device *drv; | |
832 | ||
833 | list_for_each_entry(drv, &cfg80211_drv_list, list) | |
834 | if (!ignore_reg_update(&drv->wiphy, setby)) | |
835 | wiphy_update_regulatory(&drv->wiphy, setby); | |
836 | } | |
837 | ||
838 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
839 | { | |
840 | enum ieee80211_band band; | |
841 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
842 | if (wiphy->bands[band]) | |
843 | handle_band(wiphy->bands[band]); | |
844 | if (wiphy->reg_notifier) | |
845 | wiphy->reg_notifier(wiphy, setby); | |
846 | } | |
847 | } | |
848 | ||
849 | /* Return value which can be used by ignore_request() to indicate | |
850 | * it has been determined we should intersect two regulatory domains */ | |
851 | #define REG_INTERSECT 1 | |
852 | ||
853 | /* This has the logic which determines when a new request | |
854 | * should be ignored. */ | |
855 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
856 | const char *alpha2) | |
857 | { | |
858 | /* All initial requests are respected */ | |
859 | if (!last_request) | |
860 | return 0; | |
861 | ||
862 | switch (set_by) { | |
863 | case REGDOM_SET_BY_INIT: | |
864 | return -EINVAL; | |
865 | case REGDOM_SET_BY_CORE: | |
866 | /* | |
867 | * Always respect new wireless core hints, should only happen | |
868 | * when updating the world regulatory domain at init. | |
869 | */ | |
870 | return 0; | |
871 | case REGDOM_SET_BY_COUNTRY_IE: | |
872 | if (unlikely(!is_an_alpha2(alpha2))) | |
873 | return -EINVAL; | |
874 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
875 | if (last_request->wiphy != wiphy) { | |
876 | /* | |
877 | * Two cards with two APs claiming different | |
878 | * different Country IE alpha2s. We could | |
879 | * intersect them, but that seems unlikely | |
880 | * to be correct. Reject second one for now. | |
881 | */ | |
882 | if (!alpha2_equal(alpha2, | |
883 | cfg80211_regdomain->alpha2)) | |
884 | return -EOPNOTSUPP; | |
885 | return -EALREADY; | |
886 | } | |
887 | /* Two consecutive Country IE hints on the same wiphy. | |
888 | * This should be picked up early by the driver/stack */ | |
889 | if (WARN_ON(!alpha2_equal(cfg80211_regdomain->alpha2, | |
890 | alpha2))) | |
891 | return 0; | |
892 | return -EALREADY; | |
893 | } | |
894 | return REG_INTERSECT; | |
895 | case REGDOM_SET_BY_DRIVER: | |
896 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) | |
897 | return -EALREADY; | |
898 | return 0; | |
899 | case REGDOM_SET_BY_USER: | |
900 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
901 | return REG_INTERSECT; | |
902 | /* If the user knows better the user should set the regdom | |
903 | * to their country before the IE is picked up */ | |
904 | if (last_request->initiator == REGDOM_SET_BY_USER && | |
905 | last_request->intersect) | |
906 | return -EOPNOTSUPP; | |
907 | return 0; | |
908 | } | |
909 | ||
910 | return -EINVAL; | |
911 | } | |
912 | ||
913 | /* Caller must hold &cfg80211_drv_mutex */ | |
914 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, | |
915 | const char *alpha2, | |
916 | u32 country_ie_checksum, | |
917 | enum environment_cap env) | |
918 | { | |
919 | struct regulatory_request *request; | |
920 | bool intersect = false; | |
921 | int r = 0; | |
922 | ||
923 | r = ignore_request(wiphy, set_by, alpha2); | |
924 | ||
925 | if (r == REG_INTERSECT) | |
926 | intersect = true; | |
927 | else if (r) | |
928 | return r; | |
929 | ||
930 | request = kzalloc(sizeof(struct regulatory_request), | |
931 | GFP_KERNEL); | |
932 | if (!request) | |
933 | return -ENOMEM; | |
934 | ||
935 | request->alpha2[0] = alpha2[0]; | |
936 | request->alpha2[1] = alpha2[1]; | |
937 | request->initiator = set_by; | |
938 | request->wiphy = wiphy; | |
939 | request->intersect = intersect; | |
940 | request->country_ie_checksum = country_ie_checksum; | |
941 | request->country_ie_env = env; | |
942 | ||
943 | kfree(last_request); | |
944 | last_request = request; | |
945 | /* | |
946 | * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled | |
947 | * AND if CRDA is NOT present nothing will happen, if someone | |
948 | * wants to bother with 11d with OLD_REG you can add a timer. | |
949 | * If after x amount of time nothing happens you can call: | |
950 | * | |
951 | * return set_regdom(country_ie_regdomain); | |
952 | * | |
953 | * to intersect with the static rd | |
954 | */ | |
955 | return call_crda(alpha2); | |
956 | } | |
957 | ||
958 | void regulatory_hint(struct wiphy *wiphy, const char *alpha2) | |
959 | { | |
960 | BUG_ON(!alpha2); | |
961 | ||
962 | mutex_lock(&cfg80211_drv_mutex); | |
963 | __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, 0, ENVIRON_ANY); | |
964 | mutex_unlock(&cfg80211_drv_mutex); | |
965 | } | |
966 | EXPORT_SYMBOL(regulatory_hint); | |
967 | ||
968 | static bool reg_same_country_ie_hint(struct wiphy *wiphy, | |
969 | u32 country_ie_checksum) | |
970 | { | |
971 | if (!last_request->wiphy) | |
972 | return false; | |
973 | if (likely(last_request->wiphy != wiphy)) | |
974 | return !country_ie_integrity_changes(country_ie_checksum); | |
975 | /* We should not have let these through at this point, they | |
976 | * should have been picked up earlier by the first alpha2 check | |
977 | * on the device */ | |
978 | if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum))) | |
979 | return true; | |
980 | return false; | |
981 | } | |
982 | ||
983 | void regulatory_hint_11d(struct wiphy *wiphy, | |
984 | u8 *country_ie, | |
985 | u8 country_ie_len) | |
986 | { | |
987 | struct ieee80211_regdomain *rd = NULL; | |
988 | char alpha2[2]; | |
989 | u32 checksum = 0; | |
990 | enum environment_cap env = ENVIRON_ANY; | |
991 | ||
992 | if (!last_request) | |
993 | return; | |
994 | ||
995 | mutex_lock(&cfg80211_drv_mutex); | |
996 | ||
997 | /* IE len must be evenly divisible by 2 */ | |
998 | if (country_ie_len & 0x01) | |
999 | goto out; | |
1000 | ||
1001 | if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) | |
1002 | goto out; | |
1003 | ||
1004 | /* Pending country IE processing, this can happen after we | |
1005 | * call CRDA and wait for a response if a beacon was received before | |
1006 | * we were able to process the last regulatory_hint_11d() call */ | |
1007 | if (country_ie_regdomain) | |
1008 | goto out; | |
1009 | ||
1010 | alpha2[0] = country_ie[0]; | |
1011 | alpha2[1] = country_ie[1]; | |
1012 | ||
1013 | if (country_ie[2] == 'I') | |
1014 | env = ENVIRON_INDOOR; | |
1015 | else if (country_ie[2] == 'O') | |
1016 | env = ENVIRON_OUTDOOR; | |
1017 | ||
1018 | /* We will run this for *every* beacon processed for the BSSID, so | |
1019 | * we optimize an early check to exit out early if we don't have to | |
1020 | * do anything */ | |
1021 | if (likely(last_request->wiphy)) { | |
1022 | struct cfg80211_registered_device *drv_last_ie; | |
1023 | ||
1024 | drv_last_ie = wiphy_to_dev(last_request->wiphy); | |
1025 | ||
1026 | /* Lets keep this simple -- we trust the first AP | |
1027 | * after we intersect with CRDA */ | |
1028 | if (likely(last_request->wiphy == wiphy)) { | |
1029 | /* Ignore IEs coming in on this wiphy with | |
1030 | * the same alpha2 and environment cap */ | |
1031 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, | |
1032 | alpha2) && | |
1033 | env == drv_last_ie->env)) { | |
1034 | goto out; | |
1035 | } | |
1036 | /* the wiphy moved on to another BSSID or the AP | |
1037 | * was reconfigured. XXX: We need to deal with the | |
1038 | * case where the user suspends and goes to goes | |
1039 | * to another country, and then gets IEs from an | |
1040 | * AP with different settings */ | |
1041 | goto out; | |
1042 | } else { | |
1043 | /* Ignore IEs coming in on two separate wiphys with | |
1044 | * the same alpha2 and environment cap */ | |
1045 | if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2, | |
1046 | alpha2) && | |
1047 | env == drv_last_ie->env)) { | |
1048 | goto out; | |
1049 | } | |
1050 | /* We could potentially intersect though */ | |
1051 | goto out; | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); | |
1056 | if (!rd) | |
1057 | goto out; | |
1058 | ||
1059 | /* This will not happen right now but we leave it here for the | |
1060 | * the future when we want to add suspend/resume support and having | |
1061 | * the user move to another country after doing so, or having the user | |
1062 | * move to another AP. Right now we just trust the first AP. This is why | |
1063 | * this is marked as likley(). If we hit this before we add this support | |
1064 | * we want to be informed of it as it would indicate a mistake in the | |
1065 | * current design */ | |
1066 | if (likely(WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))) | |
1067 | goto out; | |
1068 | ||
1069 | /* We keep this around for when CRDA comes back with a response so | |
1070 | * we can intersect with that */ | |
1071 | country_ie_regdomain = rd; | |
1072 | ||
1073 | __regulatory_hint(wiphy, REGDOM_SET_BY_COUNTRY_IE, | |
1074 | country_ie_regdomain->alpha2, checksum, env); | |
1075 | ||
1076 | out: | |
1077 | mutex_unlock(&cfg80211_drv_mutex); | |
1078 | } | |
1079 | EXPORT_SYMBOL(regulatory_hint_11d); | |
1080 | ||
1081 | static void print_rd_rules(const struct ieee80211_regdomain *rd) | |
1082 | { | |
1083 | unsigned int i; | |
1084 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
1085 | const struct ieee80211_freq_range *freq_range = NULL; | |
1086 | const struct ieee80211_power_rule *power_rule = NULL; | |
1087 | ||
1088 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
1089 | "(max_antenna_gain, max_eirp)\n"); | |
1090 | ||
1091 | for (i = 0; i < rd->n_reg_rules; i++) { | |
1092 | reg_rule = &rd->reg_rules[i]; | |
1093 | freq_range = ®_rule->freq_range; | |
1094 | power_rule = ®_rule->power_rule; | |
1095 | ||
1096 | /* There may not be documentation for max antenna gain | |
1097 | * in certain regions */ | |
1098 | if (power_rule->max_antenna_gain) | |
1099 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1100 | "(%d mBi, %d mBm)\n", | |
1101 | freq_range->start_freq_khz, | |
1102 | freq_range->end_freq_khz, | |
1103 | freq_range->max_bandwidth_khz, | |
1104 | power_rule->max_antenna_gain, | |
1105 | power_rule->max_eirp); | |
1106 | else | |
1107 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
1108 | "(N/A, %d mBm)\n", | |
1109 | freq_range->start_freq_khz, | |
1110 | freq_range->end_freq_khz, | |
1111 | freq_range->max_bandwidth_khz, | |
1112 | power_rule->max_eirp); | |
1113 | } | |
1114 | } | |
1115 | ||
1116 | static void print_regdomain(const struct ieee80211_regdomain *rd) | |
1117 | { | |
1118 | ||
1119 | if (is_intersected_alpha2(rd->alpha2)) { | |
1120 | struct wiphy *wiphy = NULL; | |
1121 | struct cfg80211_registered_device *drv; | |
1122 | ||
1123 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
1124 | if (last_request->wiphy) { | |
1125 | wiphy = last_request->wiphy; | |
1126 | drv = wiphy_to_dev(wiphy); | |
1127 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1128 | "domain updated by AP to: %c%c\n", | |
1129 | drv->country_ie_alpha2[0], | |
1130 | drv->country_ie_alpha2[1]); | |
1131 | } else | |
1132 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1133 | "domain intersected: \n"); | |
1134 | } else | |
1135 | printk(KERN_INFO "cfg80211: Current regulatory " | |
1136 | "intersected: \n"); | |
1137 | } else if (is_world_regdom(rd->alpha2)) | |
1138 | printk(KERN_INFO "cfg80211: World regulatory " | |
1139 | "domain updated:\n"); | |
1140 | else { | |
1141 | if (is_unknown_alpha2(rd->alpha2)) | |
1142 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1143 | "changed to driver built-in settings " | |
1144 | "(unknown country)\n"); | |
1145 | else | |
1146 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
1147 | "changed to country: %c%c\n", | |
1148 | rd->alpha2[0], rd->alpha2[1]); | |
1149 | } | |
1150 | print_rd_rules(rd); | |
1151 | } | |
1152 | ||
1153 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) | |
1154 | { | |
1155 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
1156 | rd->alpha2[0], rd->alpha2[1]); | |
1157 | print_rd_rules(rd); | |
1158 | } | |
1159 | ||
1160 | #ifdef CONFIG_CFG80211_REG_DEBUG | |
1161 | static void reg_country_ie_process_debug( | |
1162 | const struct ieee80211_regdomain *rd, | |
1163 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1164 | const struct ieee80211_regdomain *intersected_rd) | |
1165 | { | |
1166 | printk(KERN_DEBUG "cfg80211: Received country IE:\n"); | |
1167 | print_regdomain_info(country_ie_regdomain); | |
1168 | printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n"); | |
1169 | print_regdomain_info(rd); | |
1170 | if (intersected_rd) { | |
1171 | printk(KERN_DEBUG "cfg80211: We intersect both of these " | |
1172 | "and get:\n"); | |
1173 | print_regdomain_info(rd); | |
1174 | return; | |
1175 | } | |
1176 | printk(KERN_DEBUG "cfg80211: Intersection between both failed\n"); | |
1177 | } | |
1178 | #else | |
1179 | static inline void reg_country_ie_process_debug( | |
1180 | const struct ieee80211_regdomain *rd, | |
1181 | const struct ieee80211_regdomain *country_ie_regdomain, | |
1182 | const struct ieee80211_regdomain *intersected_rd) | |
1183 | { | |
1184 | } | |
1185 | #endif | |
1186 | ||
1187 | /* Takes ownership of rd only if it doesn't fail */ | |
1188 | static int __set_regdom(const struct ieee80211_regdomain *rd) | |
1189 | { | |
1190 | const struct ieee80211_regdomain *intersected_rd = NULL; | |
1191 | struct cfg80211_registered_device *drv = NULL; | |
1192 | struct wiphy *wiphy = NULL; | |
1193 | /* Some basic sanity checks first */ | |
1194 | ||
1195 | if (is_world_regdom(rd->alpha2)) { | |
1196 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) | |
1197 | return -EINVAL; | |
1198 | update_world_regdomain(rd); | |
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
1203 | !is_unknown_alpha2(rd->alpha2)) | |
1204 | return -EINVAL; | |
1205 | ||
1206 | if (!last_request) | |
1207 | return -EINVAL; | |
1208 | ||
1209 | /* Lets only bother proceeding on the same alpha2 if the current | |
1210 | * rd is non static (it means CRDA was present and was used last) | |
1211 | * and the pending request came in from a country IE */ | |
1212 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
1213 | /* If someone else asked us to change the rd lets only bother | |
1214 | * checking if the alpha2 changes if CRDA was already called */ | |
1215 | if (!is_old_static_regdom(cfg80211_regdomain) && | |
1216 | !regdom_changed(rd->alpha2)) | |
1217 | return -EINVAL; | |
1218 | } | |
1219 | ||
1220 | wiphy = last_request->wiphy; | |
1221 | ||
1222 | /* Now lets set the regulatory domain, update all driver channels | |
1223 | * and finally inform them of what we have done, in case they want | |
1224 | * to review or adjust their own settings based on their own | |
1225 | * internal EEPROM data */ | |
1226 | ||
1227 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) | |
1228 | return -EINVAL; | |
1229 | ||
1230 | if (!is_valid_rd(rd)) { | |
1231 | printk(KERN_ERR "cfg80211: Invalid " | |
1232 | "regulatory domain detected:\n"); | |
1233 | print_regdomain_info(rd); | |
1234 | return -EINVAL; | |
1235 | } | |
1236 | ||
1237 | if (!last_request->intersect) { | |
1238 | reset_regdomains(); | |
1239 | cfg80211_regdomain = rd; | |
1240 | return 0; | |
1241 | } | |
1242 | ||
1243 | /* Intersection requires a bit more work */ | |
1244 | ||
1245 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
1246 | ||
1247 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); | |
1248 | if (!intersected_rd) | |
1249 | return -EINVAL; | |
1250 | ||
1251 | /* We can trash what CRDA provided now */ | |
1252 | kfree(rd); | |
1253 | rd = NULL; | |
1254 | ||
1255 | reset_regdomains(); | |
1256 | cfg80211_regdomain = intersected_rd; | |
1257 | ||
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Country IE requests are handled a bit differently, we intersect | |
1263 | * the country IE rd with what CRDA believes that country should have | |
1264 | */ | |
1265 | ||
1266 | BUG_ON(!country_ie_regdomain); | |
1267 | ||
1268 | if (rd != country_ie_regdomain) { | |
1269 | /* Intersect what CRDA returned and our what we | |
1270 | * had built from the Country IE received */ | |
1271 | ||
1272 | intersected_rd = regdom_intersect(rd, country_ie_regdomain); | |
1273 | ||
1274 | reg_country_ie_process_debug(rd, country_ie_regdomain, | |
1275 | intersected_rd); | |
1276 | ||
1277 | kfree(country_ie_regdomain); | |
1278 | country_ie_regdomain = NULL; | |
1279 | } else { | |
1280 | /* This would happen when CRDA was not present and | |
1281 | * OLD_REGULATORY was enabled. We intersect our Country | |
1282 | * IE rd and what was set on cfg80211 originally */ | |
1283 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); | |
1284 | } | |
1285 | ||
1286 | if (!intersected_rd) | |
1287 | return -EINVAL; | |
1288 | ||
1289 | drv = wiphy_to_dev(wiphy); | |
1290 | ||
1291 | drv->country_ie_alpha2[0] = rd->alpha2[0]; | |
1292 | drv->country_ie_alpha2[1] = rd->alpha2[1]; | |
1293 | drv->env = last_request->country_ie_env; | |
1294 | ||
1295 | BUG_ON(intersected_rd == rd); | |
1296 | ||
1297 | kfree(rd); | |
1298 | rd = NULL; | |
1299 | ||
1300 | reset_regdomains(); | |
1301 | cfg80211_regdomain = intersected_rd; | |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | ||
1307 | /* Use this call to set the current regulatory domain. Conflicts with | |
1308 | * multiple drivers can be ironed out later. Caller must've already | |
1309 | * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */ | |
1310 | int set_regdom(const struct ieee80211_regdomain *rd) | |
1311 | { | |
1312 | int r; | |
1313 | ||
1314 | /* Note that this doesn't update the wiphys, this is done below */ | |
1315 | r = __set_regdom(rd); | |
1316 | if (r) { | |
1317 | kfree(rd); | |
1318 | return r; | |
1319 | } | |
1320 | ||
1321 | /* This would make this whole thing pointless */ | |
1322 | if (!last_request->intersect) | |
1323 | BUG_ON(rd != cfg80211_regdomain); | |
1324 | ||
1325 | /* update all wiphys now with the new established regulatory domain */ | |
1326 | update_all_wiphy_regulatory(last_request->initiator); | |
1327 | ||
1328 | print_regdomain(cfg80211_regdomain); | |
1329 | ||
1330 | return r; | |
1331 | } | |
1332 | ||
1333 | /* Caller must hold cfg80211_drv_mutex */ | |
1334 | void reg_device_remove(struct wiphy *wiphy) | |
1335 | { | |
1336 | if (!last_request || !last_request->wiphy) | |
1337 | return; | |
1338 | if (last_request->wiphy != wiphy) | |
1339 | return; | |
1340 | last_request->wiphy = NULL; | |
1341 | last_request->country_ie_env = ENVIRON_ANY; | |
1342 | } | |
1343 | ||
1344 | int regulatory_init(void) | |
1345 | { | |
1346 | int err; | |
1347 | ||
1348 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); | |
1349 | if (IS_ERR(reg_pdev)) | |
1350 | return PTR_ERR(reg_pdev); | |
1351 | ||
1352 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
1353 | cfg80211_regdomain = static_regdom(ieee80211_regdom); | |
1354 | ||
1355 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); | |
1356 | print_regdomain_info(cfg80211_regdomain); | |
1357 | /* The old code still requests for a new regdomain and if | |
1358 | * you have CRDA you get it updated, otherwise you get | |
1359 | * stuck with the static values. We ignore "EU" code as | |
1360 | * that is not a valid ISO / IEC 3166 alpha2 */ | |
1361 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') | |
1362 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, | |
1363 | ieee80211_regdom, 0, ENVIRON_ANY); | |
1364 | #else | |
1365 | cfg80211_regdomain = cfg80211_world_regdom; | |
1366 | ||
1367 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00", 0, ENVIRON_ANY); | |
1368 | if (err) | |
1369 | printk(KERN_ERR "cfg80211: calling CRDA failed - " | |
1370 | "unable to update world regulatory domain, " | |
1371 | "using static definition\n"); | |
1372 | #endif | |
1373 | ||
1374 | return 0; | |
1375 | } | |
1376 | ||
1377 | void regulatory_exit(void) | |
1378 | { | |
1379 | mutex_lock(&cfg80211_drv_mutex); | |
1380 | ||
1381 | reset_regdomains(); | |
1382 | ||
1383 | kfree(country_ie_regdomain); | |
1384 | country_ie_regdomain = NULL; | |
1385 | ||
1386 | kfree(last_request); | |
1387 | ||
1388 | platform_device_unregister(reg_pdev); | |
1389 | ||
1390 | mutex_unlock(&cfg80211_drv_mutex); | |
1391 | } |