Commit | Line | Data |
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8318d78a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
b2e1b302 | 5 | * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> |
8318d78a JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
b2e1b302 LR |
12 | /** |
13 | * DOC: Wireless regulatory infrastructure | |
8318d78a JB |
14 | * |
15 | * The usual implementation is for a driver to read a device EEPROM to | |
16 | * determine which regulatory domain it should be operating under, then | |
17 | * looking up the allowable channels in a driver-local table and finally | |
18 | * registering those channels in the wiphy structure. | |
19 | * | |
b2e1b302 LR |
20 | * Another set of compliance enforcement is for drivers to use their |
21 | * own compliance limits which can be stored on the EEPROM. The host | |
22 | * driver or firmware may ensure these are used. | |
23 | * | |
24 | * In addition to all this we provide an extra layer of regulatory | |
25 | * conformance. For drivers which do not have any regulatory | |
26 | * information CRDA provides the complete regulatory solution. | |
27 | * For others it provides a community effort on further restrictions | |
28 | * to enhance compliance. | |
29 | * | |
30 | * Note: When number of rules --> infinity we will not be able to | |
31 | * index on alpha2 any more, instead we'll probably have to | |
32 | * rely on some SHA1 checksum of the regdomain for example. | |
33 | * | |
8318d78a JB |
34 | */ |
35 | #include <linux/kernel.h> | |
b2e1b302 LR |
36 | #include <linux/list.h> |
37 | #include <linux/random.h> | |
38 | #include <linux/nl80211.h> | |
39 | #include <linux/platform_device.h> | |
8318d78a | 40 | #include <net/wireless.h> |
b2e1b302 | 41 | #include <net/cfg80211.h> |
8318d78a | 42 | #include "core.h" |
b2e1b302 | 43 | #include "reg.h" |
8318d78a | 44 | |
734366de JB |
45 | /* wiphy is set if this request's initiator is REGDOM_SET_BY_DRIVER */ |
46 | struct regulatory_request { | |
734366de | 47 | struct wiphy *wiphy; |
734366de JB |
48 | enum reg_set_by initiator; |
49 | char alpha2[2]; | |
50 | }; | |
51 | ||
f6037d09 | 52 | static struct regulatory_request *last_request; |
734366de | 53 | |
b2e1b302 LR |
54 | /* To trigger userspace events */ |
55 | static struct platform_device *reg_pdev; | |
8318d78a | 56 | |
b2e1b302 LR |
57 | /* Keep the ordering from large to small */ |
58 | static u32 supported_bandwidths[] = { | |
59 | MHZ_TO_KHZ(40), | |
60 | MHZ_TO_KHZ(20), | |
8318d78a JB |
61 | }; |
62 | ||
734366de JB |
63 | /* Central wireless core regulatory domains, we only need two, |
64 | * the current one and a world regulatory domain in case we have no | |
65 | * information to give us an alpha2 */ | |
a3d2eaf0 | 66 | static const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de JB |
67 | |
68 | /* We keep a static world regulatory domain in case of the absence of CRDA */ | |
69 | static const struct ieee80211_regdomain world_regdom = { | |
70 | .n_reg_rules = 1, | |
71 | .alpha2 = "00", | |
72 | .reg_rules = { | |
73 | REG_RULE(2412-10, 2462+10, 40, 6, 20, | |
74 | NL80211_RRF_PASSIVE_SCAN | | |
75 | NL80211_RRF_NO_IBSS), | |
76 | } | |
77 | }; | |
78 | ||
a3d2eaf0 JB |
79 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
80 | &world_regdom; | |
734366de JB |
81 | |
82 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
83 | static char *ieee80211_regdom = "US"; | |
84 | module_param(ieee80211_regdom, charp, 0444); | |
85 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
86 | ||
87 | /* We assume 40 MHz bandwidth for the old regulatory work. | |
88 | * We make emphasis we are using the exact same frequencies | |
89 | * as before */ | |
90 | ||
91 | static const struct ieee80211_regdomain us_regdom = { | |
92 | .n_reg_rules = 6, | |
93 | .alpha2 = "US", | |
94 | .reg_rules = { | |
95 | /* IEEE 802.11b/g, channels 1..11 */ | |
96 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
97 | /* IEEE 802.11a, channel 36 */ | |
98 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
99 | /* IEEE 802.11a, channel 40 */ | |
100 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
101 | /* IEEE 802.11a, channel 44 */ | |
102 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
103 | /* IEEE 802.11a, channels 48..64 */ | |
104 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
105 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
106 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
107 | } | |
108 | }; | |
109 | ||
110 | static const struct ieee80211_regdomain jp_regdom = { | |
111 | .n_reg_rules = 3, | |
112 | .alpha2 = "JP", | |
113 | .reg_rules = { | |
114 | /* IEEE 802.11b/g, channels 1..14 */ | |
115 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
116 | /* IEEE 802.11a, channels 34..48 */ | |
117 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
118 | NL80211_RRF_PASSIVE_SCAN), | |
119 | /* IEEE 802.11a, channels 52..64 */ | |
120 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
121 | NL80211_RRF_NO_IBSS | | |
122 | NL80211_RRF_DFS), | |
123 | } | |
124 | }; | |
125 | ||
126 | static const struct ieee80211_regdomain eu_regdom = { | |
127 | .n_reg_rules = 6, | |
128 | /* This alpha2 is bogus, we leave it here just for stupid | |
129 | * backward compatibility */ | |
130 | .alpha2 = "EU", | |
131 | .reg_rules = { | |
132 | /* IEEE 802.11b/g, channels 1..13 */ | |
133 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
134 | /* IEEE 802.11a, channel 36 */ | |
135 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
136 | NL80211_RRF_PASSIVE_SCAN), | |
137 | /* IEEE 802.11a, channel 40 */ | |
138 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
139 | NL80211_RRF_PASSIVE_SCAN), | |
140 | /* IEEE 802.11a, channel 44 */ | |
141 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
142 | NL80211_RRF_PASSIVE_SCAN), | |
143 | /* IEEE 802.11a, channels 48..64 */ | |
144 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
145 | NL80211_RRF_NO_IBSS | | |
146 | NL80211_RRF_DFS), | |
147 | /* IEEE 802.11a, channels 100..140 */ | |
148 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
149 | NL80211_RRF_NO_IBSS | | |
150 | NL80211_RRF_DFS), | |
151 | } | |
152 | }; | |
153 | ||
154 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
155 | { | |
156 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
157 | return &us_regdom; | |
158 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
159 | return &jp_regdom; | |
160 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
161 | return &eu_regdom; | |
162 | /* Default, as per the old rules */ | |
163 | return &us_regdom; | |
164 | } | |
165 | ||
a3d2eaf0 | 166 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
167 | { |
168 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
169 | return true; | |
170 | return false; | |
171 | } | |
942b25cf JB |
172 | #else |
173 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 174 | { |
942b25cf | 175 | return false; |
734366de | 176 | } |
942b25cf JB |
177 | #endif |
178 | ||
734366de JB |
179 | static void reset_regdomains(void) |
180 | { | |
942b25cf JB |
181 | /* avoid freeing static information or freeing something twice */ |
182 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
183 | cfg80211_regdomain = NULL; | |
184 | if (cfg80211_world_regdom == &world_regdom) | |
185 | cfg80211_world_regdom = NULL; | |
186 | if (cfg80211_regdomain == &world_regdom) | |
187 | cfg80211_regdomain = NULL; | |
188 | if (is_old_static_regdom(cfg80211_regdomain)) | |
189 | cfg80211_regdomain = NULL; | |
190 | ||
191 | kfree(cfg80211_regdomain); | |
192 | kfree(cfg80211_world_regdom); | |
734366de | 193 | |
a3d2eaf0 | 194 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
195 | cfg80211_regdomain = NULL; |
196 | } | |
197 | ||
198 | /* Dynamic world regulatory domain requested by the wireless | |
199 | * core upon initialization */ | |
a3d2eaf0 | 200 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 201 | { |
f6037d09 | 202 | BUG_ON(!last_request); |
734366de JB |
203 | |
204 | reset_regdomains(); | |
205 | ||
206 | cfg80211_world_regdom = rd; | |
207 | cfg80211_regdomain = rd; | |
208 | } | |
734366de | 209 | |
a3d2eaf0 | 210 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
211 | { |
212 | if (!alpha2) | |
213 | return false; | |
214 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
215 | return true; | |
216 | return false; | |
217 | } | |
8318d78a | 218 | |
a3d2eaf0 | 219 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
220 | { |
221 | if (!alpha2) | |
222 | return false; | |
223 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
224 | return true; | |
225 | return false; | |
226 | } | |
8318d78a | 227 | |
b2e1b302 LR |
228 | static bool is_alpha_upper(char letter) |
229 | { | |
230 | /* ASCII A - Z */ | |
231 | if (letter >= 65 && letter <= 90) | |
232 | return true; | |
233 | return false; | |
234 | } | |
8318d78a | 235 | |
a3d2eaf0 | 236 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
237 | { |
238 | if (!alpha2) | |
239 | return false; | |
240 | /* Special case where regulatory domain was built by driver | |
241 | * but a specific alpha2 cannot be determined */ | |
242 | if (alpha2[0] == '9' && alpha2[1] == '9') | |
243 | return true; | |
244 | return false; | |
245 | } | |
8318d78a | 246 | |
a3d2eaf0 | 247 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
248 | { |
249 | if (!alpha2) | |
250 | return false; | |
251 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
252 | return true; | |
253 | return false; | |
254 | } | |
8318d78a | 255 | |
a3d2eaf0 | 256 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
257 | { |
258 | if (!alpha2_x || !alpha2_y) | |
259 | return false; | |
260 | if (alpha2_x[0] == alpha2_y[0] && | |
261 | alpha2_x[1] == alpha2_y[1]) | |
262 | return true; | |
263 | return false; | |
264 | } | |
265 | ||
a3d2eaf0 | 266 | static bool regdom_changed(const char *alpha2) |
b2e1b302 LR |
267 | { |
268 | if (!cfg80211_regdomain) | |
269 | return true; | |
270 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
271 | return false; | |
272 | return true; | |
273 | } | |
274 | ||
275 | /* This lets us keep regulatory code which is updated on a regulatory | |
276 | * basis in userspace. */ | |
277 | static int call_crda(const char *alpha2) | |
278 | { | |
279 | char country_env[9 + 2] = "COUNTRY="; | |
280 | char *envp[] = { | |
281 | country_env, | |
282 | NULL | |
283 | }; | |
284 | ||
285 | if (!is_world_regdom((char *) alpha2)) | |
286 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
287 | alpha2[0], alpha2[1]); | |
288 | else | |
b2e1b302 LR |
289 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
290 | "regulatory domain\n"); | |
b2e1b302 LR |
291 | |
292 | country_env[8] = alpha2[0]; | |
293 | country_env[9] = alpha2[1]; | |
294 | ||
295 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
296 | } | |
297 | ||
298 | /* This has the logic which determines when a new request | |
299 | * should be ignored. */ | |
300 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
301 | char *alpha2, struct ieee80211_regdomain *rd) | |
302 | { | |
b2e1b302 | 303 | /* All initial requests are respected */ |
f6037d09 | 304 | if (!last_request) |
b2e1b302 LR |
305 | return 0; |
306 | ||
b2e1b302 LR |
307 | switch (set_by) { |
308 | case REGDOM_SET_BY_INIT: | |
309 | return -EINVAL; | |
310 | case REGDOM_SET_BY_CORE: | |
311 | /* Always respect new wireless core hints, should only | |
312 | * come in for updating the world regulatory domain at init | |
313 | * anyway */ | |
314 | return 0; | |
315 | case REGDOM_SET_BY_COUNTRY_IE: | |
f6037d09 | 316 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { |
b2e1b302 LR |
317 | if (last_request->wiphy != wiphy) { |
318 | /* Two cards with two APs claiming different | |
319 | * different Country IE alpha2s! | |
320 | * You're special!! */ | |
321 | if (!alpha2_equal(last_request->alpha2, | |
322 | cfg80211_regdomain->alpha2)) { | |
323 | /* XXX: Deal with conflict, consider | |
324 | * building a new one out of the | |
325 | * intersection */ | |
326 | WARN_ON(1); | |
327 | return -EOPNOTSUPP; | |
328 | } | |
329 | return -EALREADY; | |
330 | } | |
331 | /* Two consecutive Country IE hints on the same wiphy */ | |
332 | if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
333 | return 0; | |
334 | return -EALREADY; | |
335 | } | |
336 | if (WARN_ON(!is_alpha2_set(alpha2) || !is_an_alpha2(alpha2)), | |
337 | "Invalid Country IE regulatory hint passed " | |
338 | "to the wireless core\n") | |
339 | return -EINVAL; | |
340 | /* We ignore Country IE hints for now, as we haven't yet | |
341 | * added the dot11MultiDomainCapabilityEnabled flag | |
342 | * for wiphys */ | |
343 | return 1; | |
344 | case REGDOM_SET_BY_DRIVER: | |
345 | BUG_ON(!wiphy); | |
f6037d09 | 346 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) { |
b2e1b302 LR |
347 | /* Two separate drivers hinting different things, |
348 | * this is possible if you have two devices present | |
349 | * on a system with different EEPROM regulatory | |
350 | * readings. XXX: Do intersection, we support only | |
351 | * the first regulatory hint for now */ | |
352 | if (last_request->wiphy != wiphy) | |
353 | return -EALREADY; | |
354 | if (rd) | |
355 | return -EALREADY; | |
356 | /* Driver should not be trying to hint different | |
357 | * regulatory domains! */ | |
358 | BUG_ON(!alpha2_equal(alpha2, | |
359 | cfg80211_regdomain->alpha2)); | |
360 | return -EALREADY; | |
361 | } | |
362 | if (last_request->initiator == REGDOM_SET_BY_CORE) | |
363 | return 0; | |
364 | /* XXX: Handle intersection, and add the | |
365 | * dot11MultiDomainCapabilityEnabled flag to wiphy. For now | |
366 | * we assume the driver has this set to false, following the | |
367 | * 802.11d dot11MultiDomainCapabilityEnabled documentation */ | |
368 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
369 | return 0; | |
370 | return 0; | |
371 | case REGDOM_SET_BY_USER: | |
f6037d09 JB |
372 | if (last_request->initiator == REGDOM_SET_BY_USER || |
373 | last_request->initiator == REGDOM_SET_BY_CORE) | |
b2e1b302 LR |
374 | return 0; |
375 | /* Drivers can use their wiphy's reg_notifier() | |
376 | * to override any information */ | |
377 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) | |
378 | return 0; | |
379 | /* XXX: Handle intersection */ | |
380 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
381 | return -EOPNOTSUPP; | |
382 | return 0; | |
383 | default: | |
384 | return -EINVAL; | |
8318d78a | 385 | } |
b2e1b302 | 386 | } |
8318d78a | 387 | |
b2e1b302 | 388 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 389 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 390 | { |
f6037d09 JB |
391 | if (!last_request) |
392 | return false; | |
393 | ||
394 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 395 | } |
8318d78a | 396 | |
b2e1b302 | 397 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 398 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 399 | { |
a3d2eaf0 | 400 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
401 | u32 freq_diff; |
402 | ||
403 | if (freq_range->start_freq_khz == 0 || freq_range->end_freq_khz == 0) | |
404 | return false; | |
405 | ||
406 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
407 | return false; | |
408 | ||
409 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
410 | ||
411 | if (freq_range->max_bandwidth_khz > freq_diff) | |
412 | return false; | |
413 | ||
414 | return true; | |
415 | } | |
416 | ||
a3d2eaf0 | 417 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 418 | { |
a3d2eaf0 | 419 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 420 | unsigned int i; |
8318d78a | 421 | |
b2e1b302 LR |
422 | if (!rd->n_reg_rules) |
423 | return false; | |
8318d78a | 424 | |
b2e1b302 LR |
425 | for (i = 0; i < rd->n_reg_rules; i++) { |
426 | reg_rule = &rd->reg_rules[i]; | |
427 | if (!is_valid_reg_rule(reg_rule)) | |
428 | return false; | |
429 | } | |
430 | ||
431 | return true; | |
8318d78a JB |
432 | } |
433 | ||
b2e1b302 LR |
434 | /* Returns value in KHz */ |
435 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
436 | u32 freq) | |
437 | { | |
438 | unsigned int i; | |
439 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
440 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
441 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
442 | if (start_freq_khz >= freq_range->start_freq_khz && | |
443 | end_freq_khz <= freq_range->end_freq_khz) | |
444 | return supported_bandwidths[i]; | |
445 | } | |
446 | return 0; | |
447 | } | |
8318d78a | 448 | |
b2e1b302 LR |
449 | /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may |
450 | * want to just have the channel structure use these */ | |
451 | static u32 map_regdom_flags(u32 rd_flags) | |
452 | { | |
453 | u32 channel_flags = 0; | |
454 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
455 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
456 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
457 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
458 | if (rd_flags & NL80211_RRF_DFS) | |
459 | channel_flags |= IEEE80211_CHAN_RADAR; | |
460 | return channel_flags; | |
461 | } | |
462 | ||
463 | /** | |
464 | * freq_reg_info - get regulatory information for the given frequency | |
465 | * @center_freq: Frequency in KHz for which we want regulatory information for | |
466 | * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one | |
467 | * you can set this to 0. If this frequency is allowed we then set | |
468 | * this value to the maximum allowed bandwidth. | |
469 | * @reg_rule: the regulatory rule which we have for this frequency | |
470 | * | |
471 | * Use this function to get the regulatory rule for a specific frequency. | |
472 | */ | |
473 | static int freq_reg_info(u32 center_freq, u32 *bandwidth, | |
474 | const struct ieee80211_reg_rule **reg_rule) | |
8318d78a JB |
475 | { |
476 | int i; | |
b2e1b302 | 477 | u32 max_bandwidth = 0; |
8318d78a | 478 | |
b2e1b302 LR |
479 | if (!cfg80211_regdomain) |
480 | return -EINVAL; | |
481 | ||
482 | for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) { | |
483 | const struct ieee80211_reg_rule *rr; | |
484 | const struct ieee80211_freq_range *fr = NULL; | |
485 | const struct ieee80211_power_rule *pr = NULL; | |
486 | ||
487 | rr = &cfg80211_regdomain->reg_rules[i]; | |
488 | fr = &rr->freq_range; | |
489 | pr = &rr->power_rule; | |
490 | max_bandwidth = freq_max_bandwidth(fr, center_freq); | |
491 | if (max_bandwidth && *bandwidth <= max_bandwidth) { | |
492 | *reg_rule = rr; | |
493 | *bandwidth = max_bandwidth; | |
8318d78a JB |
494 | break; |
495 | } | |
496 | } | |
497 | ||
b2e1b302 LR |
498 | return !max_bandwidth; |
499 | } | |
500 | ||
501 | static void handle_channel(struct ieee80211_channel *chan) | |
502 | { | |
503 | int r; | |
504 | u32 flags = chan->orig_flags; | |
505 | u32 max_bandwidth = 0; | |
506 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
507 | const struct ieee80211_power_rule *power_rule = NULL; | |
508 | ||
509 | r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq), | |
510 | &max_bandwidth, ®_rule); | |
511 | ||
512 | if (r) { | |
8318d78a JB |
513 | flags |= IEEE80211_CHAN_DISABLED; |
514 | chan->flags = flags; | |
515 | return; | |
516 | } | |
517 | ||
b2e1b302 LR |
518 | power_rule = ®_rule->power_rule; |
519 | ||
520 | chan->flags = flags | map_regdom_flags(reg_rule->flags); | |
8318d78a | 521 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
522 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
523 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 524 | if (chan->orig_mpwr) |
b2e1b302 LR |
525 | chan->max_power = min(chan->orig_mpwr, |
526 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 527 | else |
b2e1b302 | 528 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
529 | } |
530 | ||
b2e1b302 | 531 | static void handle_band(struct ieee80211_supported_band *sband) |
8318d78a JB |
532 | { |
533 | int i; | |
534 | ||
535 | for (i = 0; i < sband->n_channels; i++) | |
b2e1b302 | 536 | handle_channel(&sband->channels[i]); |
8318d78a JB |
537 | } |
538 | ||
b2e1b302 | 539 | static void update_all_wiphy_regulatory(enum reg_set_by setby) |
8318d78a | 540 | { |
b2e1b302 | 541 | struct cfg80211_registered_device *drv; |
8318d78a | 542 | |
b2e1b302 LR |
543 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
544 | wiphy_update_regulatory(&drv->wiphy, setby); | |
545 | } | |
546 | ||
547 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
548 | { | |
549 | enum ieee80211_band band; | |
550 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
8318d78a | 551 | if (wiphy->bands[band]) |
b2e1b302 LR |
552 | handle_band(wiphy->bands[band]); |
553 | if (wiphy->reg_notifier) | |
554 | wiphy->reg_notifier(wiphy, setby); | |
555 | } | |
556 | } | |
557 | ||
558 | /* Caller must hold &cfg80211_drv_mutex */ | |
559 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, | |
560 | const char *alpha2, struct ieee80211_regdomain *rd) | |
561 | { | |
562 | struct regulatory_request *request; | |
563 | char *rd_alpha2; | |
564 | int r = 0; | |
565 | ||
566 | r = ignore_request(wiphy, set_by, (char *) alpha2, rd); | |
567 | if (r) | |
568 | return r; | |
569 | ||
570 | if (rd) | |
571 | rd_alpha2 = rd->alpha2; | |
572 | else | |
573 | rd_alpha2 = (char *) alpha2; | |
574 | ||
575 | switch (set_by) { | |
576 | case REGDOM_SET_BY_CORE: | |
577 | case REGDOM_SET_BY_COUNTRY_IE: | |
578 | case REGDOM_SET_BY_DRIVER: | |
579 | case REGDOM_SET_BY_USER: | |
580 | request = kzalloc(sizeof(struct regulatory_request), | |
581 | GFP_KERNEL); | |
582 | if (!request) | |
583 | return -ENOMEM; | |
584 | ||
585 | request->alpha2[0] = rd_alpha2[0]; | |
586 | request->alpha2[1] = rd_alpha2[1]; | |
587 | request->initiator = set_by; | |
588 | request->wiphy = wiphy; | |
589 | ||
f6037d09 JB |
590 | kfree(last_request); |
591 | last_request = request; | |
b2e1b302 LR |
592 | if (rd) |
593 | break; | |
594 | r = call_crda(alpha2); | |
595 | #ifndef CONFIG_WIRELESS_OLD_REGULATORY | |
596 | if (r) | |
597 | printk(KERN_ERR "cfg80211: Failed calling CRDA\n"); | |
598 | #endif | |
599 | break; | |
600 | default: | |
601 | r = -ENOTSUPP; | |
602 | break; | |
603 | } | |
604 | ||
605 | return r; | |
606 | } | |
607 | ||
608 | /* If rd is not NULL and if this call fails the caller must free it */ | |
609 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2, | |
610 | struct ieee80211_regdomain *rd) | |
611 | { | |
612 | int r; | |
613 | BUG_ON(!rd && !alpha2); | |
614 | ||
615 | mutex_lock(&cfg80211_drv_mutex); | |
616 | ||
617 | r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, rd); | |
618 | if (r || !rd) | |
619 | goto unlock_and_exit; | |
620 | ||
621 | /* If the driver passed a regulatory domain we skipped asking | |
622 | * userspace for one so we can now go ahead and set it */ | |
623 | r = set_regdom(rd); | |
624 | ||
625 | unlock_and_exit: | |
626 | mutex_unlock(&cfg80211_drv_mutex); | |
627 | return r; | |
628 | } | |
629 | EXPORT_SYMBOL(regulatory_hint); | |
630 | ||
631 | ||
a3d2eaf0 | 632 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
633 | { |
634 | unsigned int i; | |
a3d2eaf0 JB |
635 | const struct ieee80211_reg_rule *reg_rule = NULL; |
636 | const struct ieee80211_freq_range *freq_range = NULL; | |
637 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
638 | |
639 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
640 | "(max_antenna_gain, max_eirp)\n"); | |
641 | ||
642 | for (i = 0; i < rd->n_reg_rules; i++) { | |
643 | reg_rule = &rd->reg_rules[i]; | |
644 | freq_range = ®_rule->freq_range; | |
645 | power_rule = ®_rule->power_rule; | |
646 | ||
647 | /* There may not be documentation for max antenna gain | |
648 | * in certain regions */ | |
649 | if (power_rule->max_antenna_gain) | |
650 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
651 | "(%d mBi, %d mBm)\n", | |
652 | freq_range->start_freq_khz, | |
653 | freq_range->end_freq_khz, | |
654 | freq_range->max_bandwidth_khz, | |
655 | power_rule->max_antenna_gain, | |
656 | power_rule->max_eirp); | |
657 | else | |
658 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
659 | "(N/A, %d mBm)\n", | |
660 | freq_range->start_freq_khz, | |
661 | freq_range->end_freq_khz, | |
662 | freq_range->max_bandwidth_khz, | |
663 | power_rule->max_eirp); | |
664 | } | |
665 | } | |
666 | ||
a3d2eaf0 | 667 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
668 | { |
669 | ||
670 | if (is_world_regdom(rd->alpha2)) | |
671 | printk(KERN_INFO "cfg80211: World regulatory " | |
672 | "domain updated:\n"); | |
673 | else { | |
674 | if (is_unknown_alpha2(rd->alpha2)) | |
675 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
676 | "changed to driver built-in settings " | |
677 | "(unknown country)\n"); | |
678 | else | |
679 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
680 | "changed to country: %c%c\n", | |
681 | rd->alpha2[0], rd->alpha2[1]); | |
682 | } | |
683 | print_rd_rules(rd); | |
684 | } | |
685 | ||
a3d2eaf0 | 686 | void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
687 | { |
688 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
689 | rd->alpha2[0], rd->alpha2[1]); | |
690 | print_rd_rules(rd); | |
691 | } | |
692 | ||
a3d2eaf0 | 693 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 694 | { |
b2e1b302 LR |
695 | /* Some basic sanity checks first */ |
696 | ||
b2e1b302 | 697 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 698 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
699 | return -EINVAL; |
700 | update_world_regdomain(rd); | |
701 | return 0; | |
702 | } | |
b2e1b302 LR |
703 | |
704 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
705 | !is_unknown_alpha2(rd->alpha2)) | |
706 | return -EINVAL; | |
707 | ||
f6037d09 | 708 | if (!last_request) |
b2e1b302 LR |
709 | return -EINVAL; |
710 | ||
942b25cf | 711 | /* allow overriding the static definitions if CRDA is present */ |
b2e1b302 | 712 | if (!is_old_static_regdom(cfg80211_regdomain) && |
942b25cf | 713 | !regdom_changed(rd->alpha2)) |
b2e1b302 | 714 | return -EINVAL; |
b2e1b302 LR |
715 | |
716 | /* Now lets set the regulatory domain, update all driver channels | |
717 | * and finally inform them of what we have done, in case they want | |
718 | * to review or adjust their own settings based on their own | |
719 | * internal EEPROM data */ | |
720 | ||
f6037d09 | 721 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
722 | return -EINVAL; |
723 | ||
b2e1b302 | 724 | reset_regdomains(); |
b2e1b302 LR |
725 | |
726 | /* Country IE parsing coming soon */ | |
f6037d09 | 727 | switch (last_request->initiator) { |
b2e1b302 LR |
728 | case REGDOM_SET_BY_CORE: |
729 | case REGDOM_SET_BY_DRIVER: | |
730 | case REGDOM_SET_BY_USER: | |
731 | if (!is_valid_rd(rd)) { | |
732 | printk(KERN_ERR "cfg80211: Invalid " | |
733 | "regulatory domain detected:\n"); | |
734 | print_regdomain_info(rd); | |
735 | return -EINVAL; | |
736 | } | |
737 | break; | |
738 | case REGDOM_SET_BY_COUNTRY_IE: /* Not yet */ | |
739 | WARN_ON(1); | |
740 | default: | |
741 | return -EOPNOTSUPP; | |
742 | } | |
743 | ||
744 | /* Tada! */ | |
745 | cfg80211_regdomain = rd; | |
b2e1b302 LR |
746 | |
747 | return 0; | |
748 | } | |
749 | ||
750 | ||
751 | /* Use this call to set the current regulatory domain. Conflicts with | |
752 | * multiple drivers can be ironed out later. Caller must've already | |
753 | * kmalloc'd the rd structure. If this calls fails you should kfree() | |
754 | * the passed rd. Caller must hold cfg80211_drv_mutex */ | |
a3d2eaf0 | 755 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 756 | { |
b2e1b302 LR |
757 | int r; |
758 | ||
b2e1b302 LR |
759 | /* Note that this doesn't update the wiphys, this is done below */ |
760 | r = __set_regdom(rd); | |
761 | if (r) | |
762 | return r; | |
763 | ||
b2e1b302 LR |
764 | /* This would make this whole thing pointless */ |
765 | BUG_ON(rd != cfg80211_regdomain); | |
766 | ||
767 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 768 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 LR |
769 | |
770 | print_regdomain(rd); | |
771 | ||
772 | return r; | |
773 | } | |
774 | ||
775 | int regulatory_init(void) | |
776 | { | |
734366de JB |
777 | int err; |
778 | ||
b2e1b302 LR |
779 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
780 | if (IS_ERR(reg_pdev)) | |
781 | return PTR_ERR(reg_pdev); | |
734366de JB |
782 | |
783 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
a3d2eaf0 | 784 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 785 | |
942b25cf | 786 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de JB |
787 | print_regdomain_info(cfg80211_regdomain); |
788 | /* The old code still requests for a new regdomain and if | |
789 | * you have CRDA you get it updated, otherwise you get | |
790 | * stuck with the static values. We ignore "EU" code as | |
791 | * that is not a valid ISO / IEC 3166 alpha2 */ | |
ac9440a4 | 792 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') |
734366de JB |
793 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, |
794 | ieee80211_regdom, NULL); | |
795 | #else | |
a3d2eaf0 | 796 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de JB |
797 | |
798 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00", NULL); | |
799 | if (err) | |
800 | printk(KERN_ERR "cfg80211: calling CRDA failed - " | |
801 | "unable to update world regulatory domain, " | |
802 | "using static definition\n"); | |
803 | #endif | |
804 | ||
b2e1b302 LR |
805 | return 0; |
806 | } | |
807 | ||
808 | void regulatory_exit(void) | |
809 | { | |
b2e1b302 | 810 | mutex_lock(&cfg80211_drv_mutex); |
734366de | 811 | |
b2e1b302 | 812 | reset_regdomains(); |
734366de | 813 | |
f6037d09 JB |
814 | kfree(last_request); |
815 | ||
b2e1b302 | 816 | platform_device_unregister(reg_pdev); |
734366de | 817 | |
b2e1b302 | 818 | mutex_unlock(&cfg80211_drv_mutex); |
8318d78a | 819 | } |