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8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
b2e1b302 | 5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
8318d78a JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
b2e1b302 LR |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
14 | * |
15 | * The usual implementation is for a driver to read a device EEPROM to | |
16 | * determine which regulatory domain it should be operating under, then | |
17 | * looking up the allowable channels in a driver-local table and finally | |
18 | * registering those channels in the wiphy structure. | |
19 | * | |
b2e1b302 LR |
20 | * Another set of compliance enforcement is for drivers to use their |
21 | * own compliance limits which can be stored on the EEPROM. The host | |
22 | * driver or firmware may ensure these are used. | |
23 | * | |
24 | * In addition to all this we provide an extra layer of regulatory | |
25 | * conformance. For drivers which do not have any regulatory | |
26 | * information CRDA provides the complete regulatory solution. | |
27 | * For others it provides a community effort on further restrictions | |
28 | * to enhance compliance. | |
29 | * | |
30 | * Note: When number of rules --> infinity we will not be able to | |
31 | * index on alpha2 any more, instead we'll probably have to | |
32 | * rely on some SHA1 checksum of the regdomain for example. | |
33 | * | |
8318d78a JB |
34 | */ |
35 | #include <linux/kernel.h> | |
b2e1b302 LR |
36 | #include <linux/list.h> |
37 | #include <linux/random.h> | |
38 | #include <linux/nl80211.h> | |
39 | #include <linux/platform_device.h> | |
8318d78a | 40 | #include <net/wireless.h> |
b2e1b302 | 41 | #include <net/cfg80211.h> |
8318d78a | 42 | #include "core.h" |
b2e1b302 | 43 | #include "reg.h" |
8318d78a | 44 | |
5166ccd2 LR |
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. | |
be3d4810 | 63 | */ |
734366de | 64 | struct regulatory_request { |
734366de | 65 | struct wiphy *wiphy; |
734366de JB |
66 | enum reg_set_by initiator; |
67 | char alpha2[2]; | |
9c96477d | 68 | bool intersect; |
734366de JB |
69 | }; |
70 | ||
5166ccd2 | 71 | /* Receipt of information from last regulatory request */ |
f6037d09 | 72 | static struct regulatory_request *last_request; |
734366de | 73 | |
b2e1b302 LR |
74 | /* To trigger userspace events */ |
75 | static struct platform_device *reg_pdev; | |
8318d78a | 76 | |
b2e1b302 LR |
77 | /* Keep the ordering from large to small */ |
78 | static u32 supported_bandwidths[] = { | |
79 | MHZ_TO_KHZ(40), | |
80 | MHZ_TO_KHZ(20), | |
8318d78a JB |
81 | }; |
82 | ||
734366de JB |
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 */ | |
a3d2eaf0 | 86 | static const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de JB |
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 | ||
a3d2eaf0 JB |
99 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
100 | &world_regdom; | |
734366de JB |
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 | ||
a3d2eaf0 | 186 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
187 | { |
188 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
189 | return true; | |
190 | return false; | |
191 | } | |
942b25cf JB |
192 | #else |
193 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 194 | { |
942b25cf | 195 | return false; |
734366de | 196 | } |
942b25cf JB |
197 | #endif |
198 | ||
734366de JB |
199 | static void reset_regdomains(void) |
200 | { | |
942b25cf JB |
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); | |
734366de | 213 | |
a3d2eaf0 | 214 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
215 | cfg80211_regdomain = NULL; |
216 | } | |
217 | ||
218 | /* Dynamic world regulatory domain requested by the wireless | |
219 | * core upon initialization */ | |
a3d2eaf0 | 220 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 221 | { |
f6037d09 | 222 | BUG_ON(!last_request); |
734366de JB |
223 | |
224 | reset_regdomains(); | |
225 | ||
226 | cfg80211_world_regdom = rd; | |
227 | cfg80211_regdomain = rd; | |
228 | } | |
734366de | 229 | |
a3d2eaf0 | 230 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
231 | { |
232 | if (!alpha2) | |
233 | return false; | |
234 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
235 | return true; | |
236 | return false; | |
237 | } | |
8318d78a | 238 | |
a3d2eaf0 | 239 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
240 | { |
241 | if (!alpha2) | |
242 | return false; | |
243 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
244 | return true; | |
245 | return false; | |
246 | } | |
8318d78a | 247 | |
b2e1b302 LR |
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 | } | |
8318d78a | 255 | |
a3d2eaf0 | 256 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
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 | } | |
8318d78a | 266 | |
a3d2eaf0 | 267 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
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 | } | |
8318d78a | 275 | |
a3d2eaf0 | 276 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
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 | ||
a3d2eaf0 | 286 | static bool regdom_changed(const char *alpha2) |
b2e1b302 LR |
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 | |
b2e1b302 LR |
309 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
310 | "regulatory domain\n"); | |
b2e1b302 LR |
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 | ||
b2e1b302 | 318 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 319 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 320 | { |
f6037d09 JB |
321 | if (!last_request) |
322 | return false; | |
323 | ||
324 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 325 | } |
8318d78a | 326 | |
b2e1b302 | 327 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 328 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 329 | { |
a3d2eaf0 | 330 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
331 | u32 freq_diff; |
332 | ||
91e99004 | 333 | if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0) |
b2e1b302 LR |
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 | ||
d71aaf60 | 341 | if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff) |
b2e1b302 LR |
342 | return false; |
343 | ||
344 | return true; | |
345 | } | |
346 | ||
a3d2eaf0 | 347 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 348 | { |
a3d2eaf0 | 349 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 350 | unsigned int i; |
8318d78a | 351 | |
b2e1b302 LR |
352 | if (!rd->n_reg_rules) |
353 | return false; | |
8318d78a | 354 | |
88dc1c3f LR |
355 | if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES)) |
356 | return false; | |
357 | ||
b2e1b302 LR |
358 | for (i = 0; i < rd->n_reg_rules; i++) { |
359 | reg_rule = &rd->reg_rules[i]; | |
360 | if (!is_valid_reg_rule(reg_rule)) | |
361 | return false; | |
362 | } | |
363 | ||
364 | return true; | |
8318d78a JB |
365 | } |
366 | ||
b2e1b302 LR |
367 | /* Returns value in KHz */ |
368 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
369 | u32 freq) | |
370 | { | |
371 | unsigned int i; | |
372 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
373 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
374 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
375 | if (start_freq_khz >= freq_range->start_freq_khz && | |
376 | end_freq_khz <= freq_range->end_freq_khz) | |
377 | return supported_bandwidths[i]; | |
378 | } | |
379 | return 0; | |
380 | } | |
8318d78a | 381 | |
9c96477d LR |
382 | /* Helper for regdom_intersect(), this does the real |
383 | * mathematical intersection fun */ | |
384 | static int reg_rules_intersect( | |
385 | const struct ieee80211_reg_rule *rule1, | |
386 | const struct ieee80211_reg_rule *rule2, | |
387 | struct ieee80211_reg_rule *intersected_rule) | |
388 | { | |
389 | const struct ieee80211_freq_range *freq_range1, *freq_range2; | |
390 | struct ieee80211_freq_range *freq_range; | |
391 | const struct ieee80211_power_rule *power_rule1, *power_rule2; | |
392 | struct ieee80211_power_rule *power_rule; | |
393 | u32 freq_diff; | |
394 | ||
395 | freq_range1 = &rule1->freq_range; | |
396 | freq_range2 = &rule2->freq_range; | |
397 | freq_range = &intersected_rule->freq_range; | |
398 | ||
399 | power_rule1 = &rule1->power_rule; | |
400 | power_rule2 = &rule2->power_rule; | |
401 | power_rule = &intersected_rule->power_rule; | |
402 | ||
403 | freq_range->start_freq_khz = max(freq_range1->start_freq_khz, | |
404 | freq_range2->start_freq_khz); | |
405 | freq_range->end_freq_khz = min(freq_range1->end_freq_khz, | |
406 | freq_range2->end_freq_khz); | |
407 | freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, | |
408 | freq_range2->max_bandwidth_khz); | |
409 | ||
410 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
411 | if (freq_range->max_bandwidth_khz > freq_diff) | |
412 | freq_range->max_bandwidth_khz = freq_diff; | |
413 | ||
414 | power_rule->max_eirp = min(power_rule1->max_eirp, | |
415 | power_rule2->max_eirp); | |
416 | power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, | |
417 | power_rule2->max_antenna_gain); | |
418 | ||
419 | intersected_rule->flags = (rule1->flags | rule2->flags); | |
420 | ||
421 | if (!is_valid_reg_rule(intersected_rule)) | |
422 | return -EINVAL; | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | /** | |
428 | * regdom_intersect - do the intersection between two regulatory domains | |
429 | * @rd1: first regulatory domain | |
430 | * @rd2: second regulatory domain | |
431 | * | |
432 | * Use this function to get the intersection between two regulatory domains. | |
433 | * Once completed we will mark the alpha2 for the rd as intersected, "98", | |
434 | * as no one single alpha2 can represent this regulatory domain. | |
435 | * | |
436 | * Returns a pointer to the regulatory domain structure which will hold the | |
437 | * resulting intersection of rules between rd1 and rd2. We will | |
438 | * kzalloc() this structure for you. | |
439 | */ | |
440 | static struct ieee80211_regdomain *regdom_intersect( | |
441 | const struct ieee80211_regdomain *rd1, | |
442 | const struct ieee80211_regdomain *rd2) | |
443 | { | |
444 | int r, size_of_regd; | |
445 | unsigned int x, y; | |
446 | unsigned int num_rules = 0, rule_idx = 0; | |
447 | const struct ieee80211_reg_rule *rule1, *rule2; | |
448 | struct ieee80211_reg_rule *intersected_rule; | |
449 | struct ieee80211_regdomain *rd; | |
450 | /* This is just a dummy holder to help us count */ | |
451 | struct ieee80211_reg_rule irule; | |
452 | ||
453 | /* Uses the stack temporarily for counter arithmetic */ | |
454 | intersected_rule = &irule; | |
455 | ||
456 | memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule)); | |
457 | ||
458 | if (!rd1 || !rd2) | |
459 | return NULL; | |
460 | ||
461 | /* First we get a count of the rules we'll need, then we actually | |
462 | * build them. This is to so we can malloc() and free() a | |
463 | * regdomain once. The reason we use reg_rules_intersect() here | |
464 | * is it will return -EINVAL if the rule computed makes no sense. | |
465 | * All rules that do check out OK are valid. */ | |
466 | ||
467 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
468 | rule1 = &rd1->reg_rules[x]; | |
469 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
470 | rule2 = &rd2->reg_rules[y]; | |
471 | if (!reg_rules_intersect(rule1, rule2, | |
472 | intersected_rule)) | |
473 | num_rules++; | |
474 | memset(intersected_rule, 0, | |
475 | sizeof(struct ieee80211_reg_rule)); | |
476 | } | |
477 | } | |
478 | ||
479 | if (!num_rules) | |
480 | return NULL; | |
481 | ||
482 | size_of_regd = sizeof(struct ieee80211_regdomain) + | |
483 | ((num_rules + 1) * sizeof(struct ieee80211_reg_rule)); | |
484 | ||
485 | rd = kzalloc(size_of_regd, GFP_KERNEL); | |
486 | if (!rd) | |
487 | return NULL; | |
488 | ||
489 | for (x = 0; x < rd1->n_reg_rules; x++) { | |
490 | rule1 = &rd1->reg_rules[x]; | |
491 | for (y = 0; y < rd2->n_reg_rules; y++) { | |
492 | rule2 = &rd2->reg_rules[y]; | |
493 | /* This time around instead of using the stack lets | |
494 | * write to the target rule directly saving ourselves | |
495 | * a memcpy() */ | |
496 | intersected_rule = &rd->reg_rules[rule_idx]; | |
497 | r = reg_rules_intersect(rule1, rule2, | |
498 | intersected_rule); | |
499 | /* No need to memset here the intersected rule here as | |
500 | * we're not using the stack anymore */ | |
501 | if (r) | |
502 | continue; | |
503 | rule_idx++; | |
504 | } | |
505 | } | |
506 | ||
507 | if (rule_idx != num_rules) { | |
508 | kfree(rd); | |
509 | return NULL; | |
510 | } | |
511 | ||
512 | rd->n_reg_rules = num_rules; | |
513 | rd->alpha2[0] = '9'; | |
514 | rd->alpha2[1] = '8'; | |
515 | ||
516 | return rd; | |
517 | } | |
518 | ||
b2e1b302 LR |
519 | /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may |
520 | * want to just have the channel structure use these */ | |
521 | static u32 map_regdom_flags(u32 rd_flags) | |
522 | { | |
523 | u32 channel_flags = 0; | |
524 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
525 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
526 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
527 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
528 | if (rd_flags & NL80211_RRF_DFS) | |
529 | channel_flags |= IEEE80211_CHAN_RADAR; | |
530 | return channel_flags; | |
531 | } | |
532 | ||
533 | /** | |
534 | * freq_reg_info - get regulatory information for the given frequency | |
535 | * @center_freq: Frequency in KHz for which we want regulatory information for | |
536 | * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one | |
537 | * you can set this to 0. If this frequency is allowed we then set | |
538 | * this value to the maximum allowed bandwidth. | |
539 | * @reg_rule: the regulatory rule which we have for this frequency | |
540 | * | |
541 | * Use this function to get the regulatory rule for a specific frequency. | |
542 | */ | |
543 | static int freq_reg_info(u32 center_freq, u32 *bandwidth, | |
544 | const struct ieee80211_reg_rule **reg_rule) | |
8318d78a JB |
545 | { |
546 | int i; | |
b2e1b302 | 547 | u32 max_bandwidth = 0; |
8318d78a | 548 | |
b2e1b302 LR |
549 | if (!cfg80211_regdomain) |
550 | return -EINVAL; | |
551 | ||
552 | for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) { | |
553 | const struct ieee80211_reg_rule *rr; | |
554 | const struct ieee80211_freq_range *fr = NULL; | |
555 | const struct ieee80211_power_rule *pr = NULL; | |
556 | ||
557 | rr = &cfg80211_regdomain->reg_rules[i]; | |
558 | fr = &rr->freq_range; | |
559 | pr = &rr->power_rule; | |
560 | max_bandwidth = freq_max_bandwidth(fr, center_freq); | |
561 | if (max_bandwidth && *bandwidth <= max_bandwidth) { | |
562 | *reg_rule = rr; | |
563 | *bandwidth = max_bandwidth; | |
8318d78a JB |
564 | break; |
565 | } | |
566 | } | |
567 | ||
b2e1b302 LR |
568 | return !max_bandwidth; |
569 | } | |
570 | ||
571 | static void handle_channel(struct ieee80211_channel *chan) | |
572 | { | |
573 | int r; | |
574 | u32 flags = chan->orig_flags; | |
575 | u32 max_bandwidth = 0; | |
576 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
577 | const struct ieee80211_power_rule *power_rule = NULL; | |
578 | ||
579 | r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq), | |
580 | &max_bandwidth, ®_rule); | |
581 | ||
582 | if (r) { | |
8318d78a JB |
583 | flags |= IEEE80211_CHAN_DISABLED; |
584 | chan->flags = flags; | |
585 | return; | |
586 | } | |
587 | ||
b2e1b302 LR |
588 | power_rule = ®_rule->power_rule; |
589 | ||
590 | chan->flags = flags | map_regdom_flags(reg_rule->flags); | |
8318d78a | 591 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
592 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
593 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 594 | if (chan->orig_mpwr) |
b2e1b302 LR |
595 | chan->max_power = min(chan->orig_mpwr, |
596 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 597 | else |
b2e1b302 | 598 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
599 | } |
600 | ||
b2e1b302 | 601 | static void handle_band(struct ieee80211_supported_band *sband) |
8318d78a JB |
602 | { |
603 | int i; | |
604 | ||
605 | for (i = 0; i < sband->n_channels; i++) | |
b2e1b302 | 606 | handle_channel(&sband->channels[i]); |
8318d78a JB |
607 | } |
608 | ||
b2e1b302 | 609 | static void update_all_wiphy_regulatory(enum reg_set_by setby) |
8318d78a | 610 | { |
b2e1b302 | 611 | struct cfg80211_registered_device *drv; |
8318d78a | 612 | |
b2e1b302 LR |
613 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
614 | wiphy_update_regulatory(&drv->wiphy, setby); | |
615 | } | |
616 | ||
617 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
618 | { | |
619 | enum ieee80211_band band; | |
620 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
8318d78a | 621 | if (wiphy->bands[band]) |
b2e1b302 LR |
622 | handle_band(wiphy->bands[band]); |
623 | if (wiphy->reg_notifier) | |
624 | wiphy->reg_notifier(wiphy, setby); | |
625 | } | |
626 | } | |
627 | ||
9c96477d LR |
628 | /* Return value which can be used by ignore_request() to indicate |
629 | * it has been determined we should intersect two regulatory domains */ | |
630 | #define REG_INTERSECT 1 | |
631 | ||
84fa4f43 JB |
632 | /* This has the logic which determines when a new request |
633 | * should be ignored. */ | |
634 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
635 | const char *alpha2) | |
636 | { | |
637 | /* All initial requests are respected */ | |
638 | if (!last_request) | |
639 | return 0; | |
640 | ||
641 | switch (set_by) { | |
642 | case REGDOM_SET_BY_INIT: | |
643 | return -EINVAL; | |
644 | case REGDOM_SET_BY_CORE: | |
645 | /* | |
646 | * Always respect new wireless core hints, should only happen | |
647 | * when updating the world regulatory domain at init. | |
648 | */ | |
649 | return 0; | |
650 | case REGDOM_SET_BY_COUNTRY_IE: | |
651 | if (unlikely(!is_an_alpha2(alpha2))) | |
652 | return -EINVAL; | |
653 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
654 | if (last_request->wiphy != wiphy) { | |
655 | /* | |
656 | * Two cards with two APs claiming different | |
657 | * different Country IE alpha2s. We could | |
658 | * intersect them, but that seems unlikely | |
659 | * to be correct. Reject second one for now. | |
660 | */ | |
661 | if (!alpha2_equal(alpha2, | |
662 | cfg80211_regdomain->alpha2)) | |
663 | return -EOPNOTSUPP; | |
664 | return -EALREADY; | |
665 | } | |
666 | /* Two consecutive Country IE hints on the same wiphy */ | |
667 | if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
668 | return 0; | |
669 | return -EALREADY; | |
670 | } | |
671 | /* | |
672 | * Ignore Country IE hints for now, need to think about | |
673 | * what we need to do to support multi-domain operation. | |
674 | */ | |
675 | return -EOPNOTSUPP; | |
676 | case REGDOM_SET_BY_DRIVER: | |
677 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) | |
678 | return -EALREADY; | |
679 | return 0; | |
680 | case REGDOM_SET_BY_USER: | |
84fa4f43 | 681 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) |
9c96477d | 682 | return REG_INTERSECT; |
84fa4f43 JB |
683 | return 0; |
684 | } | |
685 | ||
686 | return -EINVAL; | |
687 | } | |
688 | ||
b2e1b302 LR |
689 | /* Caller must hold &cfg80211_drv_mutex */ |
690 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, | |
be3d4810 | 691 | const char *alpha2) |
b2e1b302 LR |
692 | { |
693 | struct regulatory_request *request; | |
9c96477d | 694 | bool intersect = false; |
b2e1b302 LR |
695 | int r = 0; |
696 | ||
be3d4810 | 697 | r = ignore_request(wiphy, set_by, alpha2); |
9c96477d LR |
698 | |
699 | if (r == REG_INTERSECT) | |
700 | intersect = true; | |
701 | else if (r) | |
b2e1b302 LR |
702 | return r; |
703 | ||
5203cdb6 LR |
704 | request = kzalloc(sizeof(struct regulatory_request), |
705 | GFP_KERNEL); | |
706 | if (!request) | |
707 | return -ENOMEM; | |
708 | ||
709 | request->alpha2[0] = alpha2[0]; | |
710 | request->alpha2[1] = alpha2[1]; | |
711 | request->initiator = set_by; | |
712 | request->wiphy = wiphy; | |
713 | request->intersect = intersect; | |
714 | ||
715 | kfree(last_request); | |
716 | last_request = request; | |
02ba0b32 | 717 | return call_crda(alpha2); |
b2e1b302 LR |
718 | } |
719 | ||
be3d4810 | 720 | void regulatory_hint(struct wiphy *wiphy, const char *alpha2) |
b2e1b302 | 721 | { |
be3d4810 | 722 | BUG_ON(!alpha2); |
b2e1b302 LR |
723 | |
724 | mutex_lock(&cfg80211_drv_mutex); | |
be3d4810 | 725 | __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2); |
b2e1b302 | 726 | mutex_unlock(&cfg80211_drv_mutex); |
b2e1b302 LR |
727 | } |
728 | EXPORT_SYMBOL(regulatory_hint); | |
729 | ||
730 | ||
a3d2eaf0 | 731 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
732 | { |
733 | unsigned int i; | |
a3d2eaf0 JB |
734 | const struct ieee80211_reg_rule *reg_rule = NULL; |
735 | const struct ieee80211_freq_range *freq_range = NULL; | |
736 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
737 | |
738 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
739 | "(max_antenna_gain, max_eirp)\n"); | |
740 | ||
741 | for (i = 0; i < rd->n_reg_rules; i++) { | |
742 | reg_rule = &rd->reg_rules[i]; | |
743 | freq_range = ®_rule->freq_range; | |
744 | power_rule = ®_rule->power_rule; | |
745 | ||
746 | /* There may not be documentation for max antenna gain | |
747 | * in certain regions */ | |
748 | if (power_rule->max_antenna_gain) | |
749 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
750 | "(%d mBi, %d mBm)\n", | |
751 | freq_range->start_freq_khz, | |
752 | freq_range->end_freq_khz, | |
753 | freq_range->max_bandwidth_khz, | |
754 | power_rule->max_antenna_gain, | |
755 | power_rule->max_eirp); | |
756 | else | |
757 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
758 | "(N/A, %d mBm)\n", | |
759 | freq_range->start_freq_khz, | |
760 | freq_range->end_freq_khz, | |
761 | freq_range->max_bandwidth_khz, | |
762 | power_rule->max_eirp); | |
763 | } | |
764 | } | |
765 | ||
a3d2eaf0 | 766 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
767 | { |
768 | ||
769 | if (is_world_regdom(rd->alpha2)) | |
770 | printk(KERN_INFO "cfg80211: World regulatory " | |
771 | "domain updated:\n"); | |
772 | else { | |
773 | if (is_unknown_alpha2(rd->alpha2)) | |
774 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
775 | "changed to driver built-in settings " | |
776 | "(unknown country)\n"); | |
777 | else | |
778 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
779 | "changed to country: %c%c\n", | |
780 | rd->alpha2[0], rd->alpha2[1]); | |
781 | } | |
782 | print_rd_rules(rd); | |
783 | } | |
784 | ||
2df78167 | 785 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
786 | { |
787 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
788 | rd->alpha2[0], rd->alpha2[1]); | |
789 | print_rd_rules(rd); | |
790 | } | |
791 | ||
d2372b31 | 792 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 793 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 794 | { |
9c96477d | 795 | const struct ieee80211_regdomain *intersected_rd = NULL; |
b2e1b302 LR |
796 | /* Some basic sanity checks first */ |
797 | ||
b2e1b302 | 798 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 799 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
800 | return -EINVAL; |
801 | update_world_regdomain(rd); | |
802 | return 0; | |
803 | } | |
b2e1b302 LR |
804 | |
805 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
806 | !is_unknown_alpha2(rd->alpha2)) | |
807 | return -EINVAL; | |
808 | ||
f6037d09 | 809 | if (!last_request) |
b2e1b302 LR |
810 | return -EINVAL; |
811 | ||
942b25cf | 812 | /* allow overriding the static definitions if CRDA is present */ |
b2e1b302 | 813 | if (!is_old_static_regdom(cfg80211_regdomain) && |
942b25cf | 814 | !regdom_changed(rd->alpha2)) |
b2e1b302 | 815 | return -EINVAL; |
b2e1b302 LR |
816 | |
817 | /* Now lets set the regulatory domain, update all driver channels | |
818 | * and finally inform them of what we have done, in case they want | |
819 | * to review or adjust their own settings based on their own | |
820 | * internal EEPROM data */ | |
821 | ||
f6037d09 | 822 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
823 | return -EINVAL; |
824 | ||
8375af3b LR |
825 | if (!is_valid_rd(rd)) { |
826 | printk(KERN_ERR "cfg80211: Invalid " | |
827 | "regulatory domain detected:\n"); | |
828 | print_regdomain_info(rd); | |
829 | return -EINVAL; | |
b2e1b302 LR |
830 | } |
831 | ||
b8295acd LR |
832 | if (!last_request->intersect) { |
833 | reset_regdomains(); | |
834 | cfg80211_regdomain = rd; | |
835 | return 0; | |
836 | } | |
837 | ||
838 | /* Intersection requires a bit more work */ | |
839 | ||
840 | if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) { | |
841 | ||
9c96477d LR |
842 | intersected_rd = regdom_intersect(rd, cfg80211_regdomain); |
843 | if (!intersected_rd) | |
844 | return -EINVAL; | |
b8295acd LR |
845 | |
846 | /* We can trash what CRDA provided now */ | |
9c96477d | 847 | kfree(rd); |
b8295acd LR |
848 | rd = NULL; |
849 | ||
850 | reset_regdomains(); | |
851 | cfg80211_regdomain = intersected_rd; | |
852 | ||
853 | return 0; | |
9c96477d LR |
854 | } |
855 | ||
b8295acd LR |
856 | /* Country IE parsing coming soon */ |
857 | reset_regdomains(); | |
858 | WARN_ON(1); | |
b2e1b302 LR |
859 | |
860 | return 0; | |
861 | } | |
862 | ||
863 | ||
864 | /* Use this call to set the current regulatory domain. Conflicts with | |
865 | * multiple drivers can be ironed out later. Caller must've already | |
d2372b31 | 866 | * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */ |
a3d2eaf0 | 867 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 868 | { |
b2e1b302 LR |
869 | int r; |
870 | ||
b2e1b302 LR |
871 | /* Note that this doesn't update the wiphys, this is done below */ |
872 | r = __set_regdom(rd); | |
d2372b31 JB |
873 | if (r) { |
874 | kfree(rd); | |
b2e1b302 | 875 | return r; |
d2372b31 | 876 | } |
b2e1b302 | 877 | |
b2e1b302 | 878 | /* This would make this whole thing pointless */ |
a01ddafd LR |
879 | if (!last_request->intersect) |
880 | BUG_ON(rd != cfg80211_regdomain); | |
b2e1b302 LR |
881 | |
882 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 883 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 | 884 | |
a01ddafd | 885 | print_regdomain(cfg80211_regdomain); |
b2e1b302 LR |
886 | |
887 | return r; | |
888 | } | |
889 | ||
890 | int regulatory_init(void) | |
891 | { | |
734366de JB |
892 | int err; |
893 | ||
b2e1b302 LR |
894 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
895 | if (IS_ERR(reg_pdev)) | |
896 | return PTR_ERR(reg_pdev); | |
734366de JB |
897 | |
898 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
a3d2eaf0 | 899 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 900 | |
942b25cf | 901 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de JB |
902 | print_regdomain_info(cfg80211_regdomain); |
903 | /* The old code still requests for a new regdomain and if | |
904 | * you have CRDA you get it updated, otherwise you get | |
905 | * stuck with the static values. We ignore "EU" code as | |
906 | * that is not a valid ISO / IEC 3166 alpha2 */ | |
ac9440a4 | 907 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') |
734366de | 908 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, |
be3d4810 | 909 | ieee80211_regdom); |
734366de | 910 | #else |
a3d2eaf0 | 911 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 912 | |
be3d4810 | 913 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00"); |
734366de JB |
914 | if (err) |
915 | printk(KERN_ERR "cfg80211: calling CRDA failed - " | |
916 | "unable to update world regulatory domain, " | |
917 | "using static definition\n"); | |
918 | #endif | |
919 | ||
b2e1b302 LR |
920 | return 0; |
921 | } | |
922 | ||
923 | void regulatory_exit(void) | |
924 | { | |
b2e1b302 | 925 | mutex_lock(&cfg80211_drv_mutex); |
734366de | 926 | |
b2e1b302 | 927 | reset_regdomains(); |
734366de | 928 | |
f6037d09 JB |
929 | kfree(last_request); |
930 | ||
b2e1b302 | 931 | platform_device_unregister(reg_pdev); |
734366de | 932 | |
b2e1b302 | 933 | mutex_unlock(&cfg80211_drv_mutex); |
8318d78a | 934 | } |