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 | |
be3d4810 JB |
45 | /* |
46 | * wiphy is set if this request's initiator is | |
47 | * REGDOM_SET_BY_COUNTRY_IE or _DRIVER | |
48 | */ | |
734366de | 49 | struct regulatory_request { |
734366de | 50 | struct wiphy *wiphy; |
734366de JB |
51 | enum reg_set_by initiator; |
52 | char alpha2[2]; | |
53 | }; | |
54 | ||
f6037d09 | 55 | static struct regulatory_request *last_request; |
734366de | 56 | |
b2e1b302 LR |
57 | /* To trigger userspace events */ |
58 | static struct platform_device *reg_pdev; | |
8318d78a | 59 | |
b2e1b302 LR |
60 | /* Keep the ordering from large to small */ |
61 | static u32 supported_bandwidths[] = { | |
62 | MHZ_TO_KHZ(40), | |
63 | MHZ_TO_KHZ(20), | |
8318d78a JB |
64 | }; |
65 | ||
734366de JB |
66 | /* Central wireless core regulatory domains, we only need two, |
67 | * the current one and a world regulatory domain in case we have no | |
68 | * information to give us an alpha2 */ | |
a3d2eaf0 | 69 | static const struct ieee80211_regdomain *cfg80211_regdomain; |
734366de JB |
70 | |
71 | /* We keep a static world regulatory domain in case of the absence of CRDA */ | |
72 | static const struct ieee80211_regdomain world_regdom = { | |
73 | .n_reg_rules = 1, | |
74 | .alpha2 = "00", | |
75 | .reg_rules = { | |
76 | REG_RULE(2412-10, 2462+10, 40, 6, 20, | |
77 | NL80211_RRF_PASSIVE_SCAN | | |
78 | NL80211_RRF_NO_IBSS), | |
79 | } | |
80 | }; | |
81 | ||
a3d2eaf0 JB |
82 | static const struct ieee80211_regdomain *cfg80211_world_regdom = |
83 | &world_regdom; | |
734366de JB |
84 | |
85 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
86 | static char *ieee80211_regdom = "US"; | |
87 | module_param(ieee80211_regdom, charp, 0444); | |
88 | MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); | |
89 | ||
90 | /* We assume 40 MHz bandwidth for the old regulatory work. | |
91 | * We make emphasis we are using the exact same frequencies | |
92 | * as before */ | |
93 | ||
94 | static const struct ieee80211_regdomain us_regdom = { | |
95 | .n_reg_rules = 6, | |
96 | .alpha2 = "US", | |
97 | .reg_rules = { | |
98 | /* IEEE 802.11b/g, channels 1..11 */ | |
99 | REG_RULE(2412-10, 2462+10, 40, 6, 27, 0), | |
100 | /* IEEE 802.11a, channel 36 */ | |
101 | REG_RULE(5180-10, 5180+10, 40, 6, 23, 0), | |
102 | /* IEEE 802.11a, channel 40 */ | |
103 | REG_RULE(5200-10, 5200+10, 40, 6, 23, 0), | |
104 | /* IEEE 802.11a, channel 44 */ | |
105 | REG_RULE(5220-10, 5220+10, 40, 6, 23, 0), | |
106 | /* IEEE 802.11a, channels 48..64 */ | |
107 | REG_RULE(5240-10, 5320+10, 40, 6, 23, 0), | |
108 | /* IEEE 802.11a, channels 149..165, outdoor */ | |
109 | REG_RULE(5745-10, 5825+10, 40, 6, 30, 0), | |
110 | } | |
111 | }; | |
112 | ||
113 | static const struct ieee80211_regdomain jp_regdom = { | |
114 | .n_reg_rules = 3, | |
115 | .alpha2 = "JP", | |
116 | .reg_rules = { | |
117 | /* IEEE 802.11b/g, channels 1..14 */ | |
118 | REG_RULE(2412-10, 2484+10, 40, 6, 20, 0), | |
119 | /* IEEE 802.11a, channels 34..48 */ | |
120 | REG_RULE(5170-10, 5240+10, 40, 6, 20, | |
121 | NL80211_RRF_PASSIVE_SCAN), | |
122 | /* IEEE 802.11a, channels 52..64 */ | |
123 | REG_RULE(5260-10, 5320+10, 40, 6, 20, | |
124 | NL80211_RRF_NO_IBSS | | |
125 | NL80211_RRF_DFS), | |
126 | } | |
127 | }; | |
128 | ||
129 | static const struct ieee80211_regdomain eu_regdom = { | |
130 | .n_reg_rules = 6, | |
131 | /* This alpha2 is bogus, we leave it here just for stupid | |
132 | * backward compatibility */ | |
133 | .alpha2 = "EU", | |
134 | .reg_rules = { | |
135 | /* IEEE 802.11b/g, channels 1..13 */ | |
136 | REG_RULE(2412-10, 2472+10, 40, 6, 20, 0), | |
137 | /* IEEE 802.11a, channel 36 */ | |
138 | REG_RULE(5180-10, 5180+10, 40, 6, 23, | |
139 | NL80211_RRF_PASSIVE_SCAN), | |
140 | /* IEEE 802.11a, channel 40 */ | |
141 | REG_RULE(5200-10, 5200+10, 40, 6, 23, | |
142 | NL80211_RRF_PASSIVE_SCAN), | |
143 | /* IEEE 802.11a, channel 44 */ | |
144 | REG_RULE(5220-10, 5220+10, 40, 6, 23, | |
145 | NL80211_RRF_PASSIVE_SCAN), | |
146 | /* IEEE 802.11a, channels 48..64 */ | |
147 | REG_RULE(5240-10, 5320+10, 40, 6, 20, | |
148 | NL80211_RRF_NO_IBSS | | |
149 | NL80211_RRF_DFS), | |
150 | /* IEEE 802.11a, channels 100..140 */ | |
151 | REG_RULE(5500-10, 5700+10, 40, 6, 30, | |
152 | NL80211_RRF_NO_IBSS | | |
153 | NL80211_RRF_DFS), | |
154 | } | |
155 | }; | |
156 | ||
157 | static const struct ieee80211_regdomain *static_regdom(char *alpha2) | |
158 | { | |
159 | if (alpha2[0] == 'U' && alpha2[1] == 'S') | |
160 | return &us_regdom; | |
161 | if (alpha2[0] == 'J' && alpha2[1] == 'P') | |
162 | return &jp_regdom; | |
163 | if (alpha2[0] == 'E' && alpha2[1] == 'U') | |
164 | return &eu_regdom; | |
165 | /* Default, as per the old rules */ | |
166 | return &us_regdom; | |
167 | } | |
168 | ||
a3d2eaf0 | 169 | static bool is_old_static_regdom(const struct ieee80211_regdomain *rd) |
734366de JB |
170 | { |
171 | if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom) | |
172 | return true; | |
173 | return false; | |
174 | } | |
942b25cf JB |
175 | #else |
176 | static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd) | |
734366de | 177 | { |
942b25cf | 178 | return false; |
734366de | 179 | } |
942b25cf JB |
180 | #endif |
181 | ||
734366de JB |
182 | static void reset_regdomains(void) |
183 | { | |
942b25cf JB |
184 | /* avoid freeing static information or freeing something twice */ |
185 | if (cfg80211_regdomain == cfg80211_world_regdom) | |
186 | cfg80211_regdomain = NULL; | |
187 | if (cfg80211_world_regdom == &world_regdom) | |
188 | cfg80211_world_regdom = NULL; | |
189 | if (cfg80211_regdomain == &world_regdom) | |
190 | cfg80211_regdomain = NULL; | |
191 | if (is_old_static_regdom(cfg80211_regdomain)) | |
192 | cfg80211_regdomain = NULL; | |
193 | ||
194 | kfree(cfg80211_regdomain); | |
195 | kfree(cfg80211_world_regdom); | |
734366de | 196 | |
a3d2eaf0 | 197 | cfg80211_world_regdom = &world_regdom; |
734366de JB |
198 | cfg80211_regdomain = NULL; |
199 | } | |
200 | ||
201 | /* Dynamic world regulatory domain requested by the wireless | |
202 | * core upon initialization */ | |
a3d2eaf0 | 203 | static void update_world_regdomain(const struct ieee80211_regdomain *rd) |
734366de | 204 | { |
f6037d09 | 205 | BUG_ON(!last_request); |
734366de JB |
206 | |
207 | reset_regdomains(); | |
208 | ||
209 | cfg80211_world_regdom = rd; | |
210 | cfg80211_regdomain = rd; | |
211 | } | |
734366de | 212 | |
a3d2eaf0 | 213 | bool is_world_regdom(const char *alpha2) |
b2e1b302 LR |
214 | { |
215 | if (!alpha2) | |
216 | return false; | |
217 | if (alpha2[0] == '0' && alpha2[1] == '0') | |
218 | return true; | |
219 | return false; | |
220 | } | |
8318d78a | 221 | |
a3d2eaf0 | 222 | static bool is_alpha2_set(const char *alpha2) |
b2e1b302 LR |
223 | { |
224 | if (!alpha2) | |
225 | return false; | |
226 | if (alpha2[0] != 0 && alpha2[1] != 0) | |
227 | return true; | |
228 | return false; | |
229 | } | |
8318d78a | 230 | |
b2e1b302 LR |
231 | static bool is_alpha_upper(char letter) |
232 | { | |
233 | /* ASCII A - Z */ | |
234 | if (letter >= 65 && letter <= 90) | |
235 | return true; | |
236 | return false; | |
237 | } | |
8318d78a | 238 | |
a3d2eaf0 | 239 | static bool is_unknown_alpha2(const char *alpha2) |
b2e1b302 LR |
240 | { |
241 | if (!alpha2) | |
242 | return false; | |
243 | /* Special case where regulatory domain was built by driver | |
244 | * but a specific alpha2 cannot be determined */ | |
245 | if (alpha2[0] == '9' && alpha2[1] == '9') | |
246 | return true; | |
247 | return false; | |
248 | } | |
8318d78a | 249 | |
a3d2eaf0 | 250 | static bool is_an_alpha2(const char *alpha2) |
b2e1b302 LR |
251 | { |
252 | if (!alpha2) | |
253 | return false; | |
254 | if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1])) | |
255 | return true; | |
256 | return false; | |
257 | } | |
8318d78a | 258 | |
a3d2eaf0 | 259 | static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y) |
b2e1b302 LR |
260 | { |
261 | if (!alpha2_x || !alpha2_y) | |
262 | return false; | |
263 | if (alpha2_x[0] == alpha2_y[0] && | |
264 | alpha2_x[1] == alpha2_y[1]) | |
265 | return true; | |
266 | return false; | |
267 | } | |
268 | ||
a3d2eaf0 | 269 | static bool regdom_changed(const char *alpha2) |
b2e1b302 LR |
270 | { |
271 | if (!cfg80211_regdomain) | |
272 | return true; | |
273 | if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
274 | return false; | |
275 | return true; | |
276 | } | |
277 | ||
278 | /* This lets us keep regulatory code which is updated on a regulatory | |
279 | * basis in userspace. */ | |
280 | static int call_crda(const char *alpha2) | |
281 | { | |
282 | char country_env[9 + 2] = "COUNTRY="; | |
283 | char *envp[] = { | |
284 | country_env, | |
285 | NULL | |
286 | }; | |
287 | ||
288 | if (!is_world_regdom((char *) alpha2)) | |
289 | printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n", | |
290 | alpha2[0], alpha2[1]); | |
291 | else | |
b2e1b302 LR |
292 | printk(KERN_INFO "cfg80211: Calling CRDA to update world " |
293 | "regulatory domain\n"); | |
b2e1b302 LR |
294 | |
295 | country_env[8] = alpha2[0]; | |
296 | country_env[9] = alpha2[1]; | |
297 | ||
298 | return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp); | |
299 | } | |
300 | ||
b2e1b302 | 301 | /* Used by nl80211 before kmalloc'ing our regulatory domain */ |
a3d2eaf0 | 302 | bool reg_is_valid_request(const char *alpha2) |
b2e1b302 | 303 | { |
f6037d09 JB |
304 | if (!last_request) |
305 | return false; | |
306 | ||
307 | return alpha2_equal(last_request->alpha2, alpha2); | |
b2e1b302 | 308 | } |
8318d78a | 309 | |
b2e1b302 | 310 | /* Sanity check on a regulatory rule */ |
a3d2eaf0 | 311 | static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule) |
8318d78a | 312 | { |
a3d2eaf0 | 313 | const struct ieee80211_freq_range *freq_range = &rule->freq_range; |
b2e1b302 LR |
314 | u32 freq_diff; |
315 | ||
316 | if (freq_range->start_freq_khz == 0 || freq_range->end_freq_khz == 0) | |
317 | return false; | |
318 | ||
319 | if (freq_range->start_freq_khz > freq_range->end_freq_khz) | |
320 | return false; | |
321 | ||
322 | freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; | |
323 | ||
d71aaf60 | 324 | if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff) |
b2e1b302 LR |
325 | return false; |
326 | ||
327 | return true; | |
328 | } | |
329 | ||
a3d2eaf0 | 330 | static bool is_valid_rd(const struct ieee80211_regdomain *rd) |
b2e1b302 | 331 | { |
a3d2eaf0 | 332 | const struct ieee80211_reg_rule *reg_rule = NULL; |
b2e1b302 | 333 | unsigned int i; |
8318d78a | 334 | |
b2e1b302 LR |
335 | if (!rd->n_reg_rules) |
336 | return false; | |
8318d78a | 337 | |
b2e1b302 LR |
338 | for (i = 0; i < rd->n_reg_rules; i++) { |
339 | reg_rule = &rd->reg_rules[i]; | |
340 | if (!is_valid_reg_rule(reg_rule)) | |
341 | return false; | |
342 | } | |
343 | ||
344 | return true; | |
8318d78a JB |
345 | } |
346 | ||
b2e1b302 LR |
347 | /* Returns value in KHz */ |
348 | static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range, | |
349 | u32 freq) | |
350 | { | |
351 | unsigned int i; | |
352 | for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) { | |
353 | u32 start_freq_khz = freq - supported_bandwidths[i]/2; | |
354 | u32 end_freq_khz = freq + supported_bandwidths[i]/2; | |
355 | if (start_freq_khz >= freq_range->start_freq_khz && | |
356 | end_freq_khz <= freq_range->end_freq_khz) | |
357 | return supported_bandwidths[i]; | |
358 | } | |
359 | return 0; | |
360 | } | |
8318d78a | 361 | |
b2e1b302 LR |
362 | /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may |
363 | * want to just have the channel structure use these */ | |
364 | static u32 map_regdom_flags(u32 rd_flags) | |
365 | { | |
366 | u32 channel_flags = 0; | |
367 | if (rd_flags & NL80211_RRF_PASSIVE_SCAN) | |
368 | channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; | |
369 | if (rd_flags & NL80211_RRF_NO_IBSS) | |
370 | channel_flags |= IEEE80211_CHAN_NO_IBSS; | |
371 | if (rd_flags & NL80211_RRF_DFS) | |
372 | channel_flags |= IEEE80211_CHAN_RADAR; | |
373 | return channel_flags; | |
374 | } | |
375 | ||
376 | /** | |
377 | * freq_reg_info - get regulatory information for the given frequency | |
378 | * @center_freq: Frequency in KHz for which we want regulatory information for | |
379 | * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one | |
380 | * you can set this to 0. If this frequency is allowed we then set | |
381 | * this value to the maximum allowed bandwidth. | |
382 | * @reg_rule: the regulatory rule which we have for this frequency | |
383 | * | |
384 | * Use this function to get the regulatory rule for a specific frequency. | |
385 | */ | |
386 | static int freq_reg_info(u32 center_freq, u32 *bandwidth, | |
387 | const struct ieee80211_reg_rule **reg_rule) | |
8318d78a JB |
388 | { |
389 | int i; | |
b2e1b302 | 390 | u32 max_bandwidth = 0; |
8318d78a | 391 | |
b2e1b302 LR |
392 | if (!cfg80211_regdomain) |
393 | return -EINVAL; | |
394 | ||
395 | for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) { | |
396 | const struct ieee80211_reg_rule *rr; | |
397 | const struct ieee80211_freq_range *fr = NULL; | |
398 | const struct ieee80211_power_rule *pr = NULL; | |
399 | ||
400 | rr = &cfg80211_regdomain->reg_rules[i]; | |
401 | fr = &rr->freq_range; | |
402 | pr = &rr->power_rule; | |
403 | max_bandwidth = freq_max_bandwidth(fr, center_freq); | |
404 | if (max_bandwidth && *bandwidth <= max_bandwidth) { | |
405 | *reg_rule = rr; | |
406 | *bandwidth = max_bandwidth; | |
8318d78a JB |
407 | break; |
408 | } | |
409 | } | |
410 | ||
b2e1b302 LR |
411 | return !max_bandwidth; |
412 | } | |
413 | ||
414 | static void handle_channel(struct ieee80211_channel *chan) | |
415 | { | |
416 | int r; | |
417 | u32 flags = chan->orig_flags; | |
418 | u32 max_bandwidth = 0; | |
419 | const struct ieee80211_reg_rule *reg_rule = NULL; | |
420 | const struct ieee80211_power_rule *power_rule = NULL; | |
421 | ||
422 | r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq), | |
423 | &max_bandwidth, ®_rule); | |
424 | ||
425 | if (r) { | |
8318d78a JB |
426 | flags |= IEEE80211_CHAN_DISABLED; |
427 | chan->flags = flags; | |
428 | return; | |
429 | } | |
430 | ||
b2e1b302 LR |
431 | power_rule = ®_rule->power_rule; |
432 | ||
433 | chan->flags = flags | map_regdom_flags(reg_rule->flags); | |
8318d78a | 434 | chan->max_antenna_gain = min(chan->orig_mag, |
b2e1b302 LR |
435 | (int) MBI_TO_DBI(power_rule->max_antenna_gain)); |
436 | chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth); | |
253898c4 | 437 | if (chan->orig_mpwr) |
b2e1b302 LR |
438 | chan->max_power = min(chan->orig_mpwr, |
439 | (int) MBM_TO_DBM(power_rule->max_eirp)); | |
253898c4 | 440 | else |
b2e1b302 | 441 | chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); |
8318d78a JB |
442 | } |
443 | ||
b2e1b302 | 444 | static void handle_band(struct ieee80211_supported_band *sband) |
8318d78a JB |
445 | { |
446 | int i; | |
447 | ||
448 | for (i = 0; i < sband->n_channels; i++) | |
b2e1b302 | 449 | handle_channel(&sband->channels[i]); |
8318d78a JB |
450 | } |
451 | ||
b2e1b302 | 452 | static void update_all_wiphy_regulatory(enum reg_set_by setby) |
8318d78a | 453 | { |
b2e1b302 | 454 | struct cfg80211_registered_device *drv; |
8318d78a | 455 | |
b2e1b302 LR |
456 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
457 | wiphy_update_regulatory(&drv->wiphy, setby); | |
458 | } | |
459 | ||
460 | void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby) | |
461 | { | |
462 | enum ieee80211_band band; | |
463 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
8318d78a | 464 | if (wiphy->bands[band]) |
b2e1b302 LR |
465 | handle_band(wiphy->bands[band]); |
466 | if (wiphy->reg_notifier) | |
467 | wiphy->reg_notifier(wiphy, setby); | |
468 | } | |
469 | } | |
470 | ||
84fa4f43 JB |
471 | /* This has the logic which determines when a new request |
472 | * should be ignored. */ | |
473 | static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, | |
474 | const char *alpha2) | |
475 | { | |
476 | /* All initial requests are respected */ | |
477 | if (!last_request) | |
478 | return 0; | |
479 | ||
480 | switch (set_by) { | |
481 | case REGDOM_SET_BY_INIT: | |
482 | return -EINVAL; | |
483 | case REGDOM_SET_BY_CORE: | |
484 | /* | |
485 | * Always respect new wireless core hints, should only happen | |
486 | * when updating the world regulatory domain at init. | |
487 | */ | |
488 | return 0; | |
489 | case REGDOM_SET_BY_COUNTRY_IE: | |
490 | if (unlikely(!is_an_alpha2(alpha2))) | |
491 | return -EINVAL; | |
492 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) { | |
493 | if (last_request->wiphy != wiphy) { | |
494 | /* | |
495 | * Two cards with two APs claiming different | |
496 | * different Country IE alpha2s. We could | |
497 | * intersect them, but that seems unlikely | |
498 | * to be correct. Reject second one for now. | |
499 | */ | |
500 | if (!alpha2_equal(alpha2, | |
501 | cfg80211_regdomain->alpha2)) | |
502 | return -EOPNOTSUPP; | |
503 | return -EALREADY; | |
504 | } | |
505 | /* Two consecutive Country IE hints on the same wiphy */ | |
506 | if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2)) | |
507 | return 0; | |
508 | return -EALREADY; | |
509 | } | |
510 | /* | |
511 | * Ignore Country IE hints for now, need to think about | |
512 | * what we need to do to support multi-domain operation. | |
513 | */ | |
514 | return -EOPNOTSUPP; | |
515 | case REGDOM_SET_BY_DRIVER: | |
516 | if (last_request->initiator == REGDOM_SET_BY_DRIVER) | |
517 | return -EALREADY; | |
518 | return 0; | |
519 | case REGDOM_SET_BY_USER: | |
520 | /* | |
521 | * If the user wants to override the AP's hint, we may | |
522 | * need to follow both and use the intersection. For now, | |
523 | * reject any such attempt (but we don't support country | |
524 | * IEs right now anyway.) | |
525 | */ | |
526 | if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) | |
527 | return -EOPNOTSUPP; | |
528 | return 0; | |
529 | } | |
530 | ||
531 | return -EINVAL; | |
532 | } | |
533 | ||
b2e1b302 LR |
534 | /* Caller must hold &cfg80211_drv_mutex */ |
535 | int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, | |
be3d4810 | 536 | const char *alpha2) |
b2e1b302 LR |
537 | { |
538 | struct regulatory_request *request; | |
b2e1b302 LR |
539 | int r = 0; |
540 | ||
be3d4810 | 541 | r = ignore_request(wiphy, set_by, alpha2); |
b2e1b302 LR |
542 | if (r) |
543 | return r; | |
544 | ||
b2e1b302 LR |
545 | switch (set_by) { |
546 | case REGDOM_SET_BY_CORE: | |
547 | case REGDOM_SET_BY_COUNTRY_IE: | |
548 | case REGDOM_SET_BY_DRIVER: | |
549 | case REGDOM_SET_BY_USER: | |
550 | request = kzalloc(sizeof(struct regulatory_request), | |
be3d4810 | 551 | GFP_KERNEL); |
b2e1b302 LR |
552 | if (!request) |
553 | return -ENOMEM; | |
554 | ||
be3d4810 JB |
555 | request->alpha2[0] = alpha2[0]; |
556 | request->alpha2[1] = alpha2[1]; | |
b2e1b302 LR |
557 | request->initiator = set_by; |
558 | request->wiphy = wiphy; | |
559 | ||
f6037d09 JB |
560 | kfree(last_request); |
561 | last_request = request; | |
b2e1b302 LR |
562 | r = call_crda(alpha2); |
563 | #ifndef CONFIG_WIRELESS_OLD_REGULATORY | |
564 | if (r) | |
565 | printk(KERN_ERR "cfg80211: Failed calling CRDA\n"); | |
566 | #endif | |
567 | break; | |
568 | default: | |
569 | r = -ENOTSUPP; | |
570 | break; | |
571 | } | |
572 | ||
573 | return r; | |
574 | } | |
575 | ||
be3d4810 | 576 | void regulatory_hint(struct wiphy *wiphy, const char *alpha2) |
b2e1b302 | 577 | { |
be3d4810 | 578 | BUG_ON(!alpha2); |
b2e1b302 LR |
579 | |
580 | mutex_lock(&cfg80211_drv_mutex); | |
be3d4810 | 581 | __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2); |
b2e1b302 | 582 | mutex_unlock(&cfg80211_drv_mutex); |
b2e1b302 LR |
583 | } |
584 | EXPORT_SYMBOL(regulatory_hint); | |
585 | ||
586 | ||
a3d2eaf0 | 587 | static void print_rd_rules(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
588 | { |
589 | unsigned int i; | |
a3d2eaf0 JB |
590 | const struct ieee80211_reg_rule *reg_rule = NULL; |
591 | const struct ieee80211_freq_range *freq_range = NULL; | |
592 | const struct ieee80211_power_rule *power_rule = NULL; | |
b2e1b302 LR |
593 | |
594 | printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), " | |
595 | "(max_antenna_gain, max_eirp)\n"); | |
596 | ||
597 | for (i = 0; i < rd->n_reg_rules; i++) { | |
598 | reg_rule = &rd->reg_rules[i]; | |
599 | freq_range = ®_rule->freq_range; | |
600 | power_rule = ®_rule->power_rule; | |
601 | ||
602 | /* There may not be documentation for max antenna gain | |
603 | * in certain regions */ | |
604 | if (power_rule->max_antenna_gain) | |
605 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
606 | "(%d mBi, %d mBm)\n", | |
607 | freq_range->start_freq_khz, | |
608 | freq_range->end_freq_khz, | |
609 | freq_range->max_bandwidth_khz, | |
610 | power_rule->max_antenna_gain, | |
611 | power_rule->max_eirp); | |
612 | else | |
613 | printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), " | |
614 | "(N/A, %d mBm)\n", | |
615 | freq_range->start_freq_khz, | |
616 | freq_range->end_freq_khz, | |
617 | freq_range->max_bandwidth_khz, | |
618 | power_rule->max_eirp); | |
619 | } | |
620 | } | |
621 | ||
a3d2eaf0 | 622 | static void print_regdomain(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
623 | { |
624 | ||
625 | if (is_world_regdom(rd->alpha2)) | |
626 | printk(KERN_INFO "cfg80211: World regulatory " | |
627 | "domain updated:\n"); | |
628 | else { | |
629 | if (is_unknown_alpha2(rd->alpha2)) | |
630 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
631 | "changed to driver built-in settings " | |
632 | "(unknown country)\n"); | |
633 | else | |
634 | printk(KERN_INFO "cfg80211: Regulatory domain " | |
635 | "changed to country: %c%c\n", | |
636 | rd->alpha2[0], rd->alpha2[1]); | |
637 | } | |
638 | print_rd_rules(rd); | |
639 | } | |
640 | ||
2df78167 | 641 | static void print_regdomain_info(const struct ieee80211_regdomain *rd) |
b2e1b302 LR |
642 | { |
643 | printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n", | |
644 | rd->alpha2[0], rd->alpha2[1]); | |
645 | print_rd_rules(rd); | |
646 | } | |
647 | ||
d2372b31 | 648 | /* Takes ownership of rd only if it doesn't fail */ |
a3d2eaf0 | 649 | static int __set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 650 | { |
b2e1b302 LR |
651 | /* Some basic sanity checks first */ |
652 | ||
b2e1b302 | 653 | if (is_world_regdom(rd->alpha2)) { |
f6037d09 | 654 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
655 | return -EINVAL; |
656 | update_world_regdomain(rd); | |
657 | return 0; | |
658 | } | |
b2e1b302 LR |
659 | |
660 | if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && | |
661 | !is_unknown_alpha2(rd->alpha2)) | |
662 | return -EINVAL; | |
663 | ||
f6037d09 | 664 | if (!last_request) |
b2e1b302 LR |
665 | return -EINVAL; |
666 | ||
942b25cf | 667 | /* allow overriding the static definitions if CRDA is present */ |
b2e1b302 | 668 | if (!is_old_static_regdom(cfg80211_regdomain) && |
942b25cf | 669 | !regdom_changed(rd->alpha2)) |
b2e1b302 | 670 | return -EINVAL; |
b2e1b302 LR |
671 | |
672 | /* Now lets set the regulatory domain, update all driver channels | |
673 | * and finally inform them of what we have done, in case they want | |
674 | * to review or adjust their own settings based on their own | |
675 | * internal EEPROM data */ | |
676 | ||
f6037d09 | 677 | if (WARN_ON(!reg_is_valid_request(rd->alpha2))) |
b2e1b302 LR |
678 | return -EINVAL; |
679 | ||
b2e1b302 | 680 | reset_regdomains(); |
b2e1b302 LR |
681 | |
682 | /* Country IE parsing coming soon */ | |
f6037d09 | 683 | switch (last_request->initiator) { |
b2e1b302 LR |
684 | case REGDOM_SET_BY_CORE: |
685 | case REGDOM_SET_BY_DRIVER: | |
686 | case REGDOM_SET_BY_USER: | |
687 | if (!is_valid_rd(rd)) { | |
688 | printk(KERN_ERR "cfg80211: Invalid " | |
689 | "regulatory domain detected:\n"); | |
690 | print_regdomain_info(rd); | |
691 | return -EINVAL; | |
692 | } | |
693 | break; | |
694 | case REGDOM_SET_BY_COUNTRY_IE: /* Not yet */ | |
695 | WARN_ON(1); | |
696 | default: | |
697 | return -EOPNOTSUPP; | |
698 | } | |
699 | ||
700 | /* Tada! */ | |
701 | cfg80211_regdomain = rd; | |
b2e1b302 LR |
702 | |
703 | return 0; | |
704 | } | |
705 | ||
706 | ||
707 | /* Use this call to set the current regulatory domain. Conflicts with | |
708 | * multiple drivers can be ironed out later. Caller must've already | |
d2372b31 | 709 | * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */ |
a3d2eaf0 | 710 | int set_regdom(const struct ieee80211_regdomain *rd) |
b2e1b302 | 711 | { |
b2e1b302 LR |
712 | int r; |
713 | ||
b2e1b302 LR |
714 | /* Note that this doesn't update the wiphys, this is done below */ |
715 | r = __set_regdom(rd); | |
d2372b31 JB |
716 | if (r) { |
717 | kfree(rd); | |
b2e1b302 | 718 | return r; |
d2372b31 | 719 | } |
b2e1b302 | 720 | |
b2e1b302 LR |
721 | /* This would make this whole thing pointless */ |
722 | BUG_ON(rd != cfg80211_regdomain); | |
723 | ||
724 | /* update all wiphys now with the new established regulatory domain */ | |
f6037d09 | 725 | update_all_wiphy_regulatory(last_request->initiator); |
b2e1b302 LR |
726 | |
727 | print_regdomain(rd); | |
728 | ||
729 | return r; | |
730 | } | |
731 | ||
732 | int regulatory_init(void) | |
733 | { | |
734366de JB |
734 | int err; |
735 | ||
b2e1b302 LR |
736 | reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); |
737 | if (IS_ERR(reg_pdev)) | |
738 | return PTR_ERR(reg_pdev); | |
734366de JB |
739 | |
740 | #ifdef CONFIG_WIRELESS_OLD_REGULATORY | |
a3d2eaf0 | 741 | cfg80211_regdomain = static_regdom(ieee80211_regdom); |
734366de | 742 | |
942b25cf | 743 | printk(KERN_INFO "cfg80211: Using static regulatory domain info\n"); |
734366de JB |
744 | print_regdomain_info(cfg80211_regdomain); |
745 | /* The old code still requests for a new regdomain and if | |
746 | * you have CRDA you get it updated, otherwise you get | |
747 | * stuck with the static values. We ignore "EU" code as | |
748 | * that is not a valid ISO / IEC 3166 alpha2 */ | |
ac9440a4 | 749 | if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U') |
734366de | 750 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, |
be3d4810 | 751 | ieee80211_regdom); |
734366de | 752 | #else |
a3d2eaf0 | 753 | cfg80211_regdomain = cfg80211_world_regdom; |
734366de | 754 | |
be3d4810 | 755 | err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00"); |
734366de JB |
756 | if (err) |
757 | printk(KERN_ERR "cfg80211: calling CRDA failed - " | |
758 | "unable to update world regulatory domain, " | |
759 | "using static definition\n"); | |
760 | #endif | |
761 | ||
b2e1b302 LR |
762 | return 0; |
763 | } | |
764 | ||
765 | void regulatory_exit(void) | |
766 | { | |
b2e1b302 | 767 | mutex_lock(&cfg80211_drv_mutex); |
734366de | 768 | |
b2e1b302 | 769 | reset_regdomains(); |
734366de | 770 | |
f6037d09 JB |
771 | kfree(last_request); |
772 | ||
b2e1b302 | 773 | platform_device_unregister(reg_pdev); |
734366de | 774 | |
b2e1b302 | 775 | mutex_unlock(&cfg80211_drv_mutex); |
8318d78a | 776 | } |