blob: 290ececd4f1189888a2280d43ab68a8b751d4824 [file] [log] [blame]
Johannes Berg8318d782008-01-24 19:38:38 +01001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -07005 * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com>
Johannes Berg8318d782008-01-24 19:38:38 +01006 *
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
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070012/**
13 * DOC: Wireless regulatory infrastructure
Johannes Berg8318d782008-01-24 19:38:38 +010014 *
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 *
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070020 * 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 *
Johannes Berg8318d782008-01-24 19:38:38 +010034 */
35#include <linux/kernel.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070036#include <linux/list.h>
37#include <linux/random.h>
38#include <linux/nl80211.h>
39#include <linux/platform_device.h>
Johannes Berg8318d782008-01-24 19:38:38 +010040#include <net/wireless.h>
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070041#include <net/cfg80211.h>
Johannes Berg8318d782008-01-24 19:38:38 +010042#include "core.h"
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070043#include "reg.h"
Johannes Berg8318d782008-01-24 19:38:38 +010044
Luis R. Rodriguez5166ccd2008-10-30 13:33:56 -070045/**
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.
Johannes Bergbe3d4812008-10-24 20:32:21 +020063 */
Johannes Berg734366d2008-09-15 10:56:48 +020064struct regulatory_request {
Johannes Berg734366d2008-09-15 10:56:48 +020065 struct wiphy *wiphy;
Johannes Berg734366d2008-09-15 10:56:48 +020066 enum reg_set_by initiator;
67 char alpha2[2];
Luis R. Rodriguez9c964772008-10-30 13:33:53 -070068 bool intersect;
Johannes Berg734366d2008-09-15 10:56:48 +020069};
70
Luis R. Rodriguez5166ccd2008-10-30 13:33:56 -070071/* Receipt of information from last regulatory request */
Johannes Bergf6037d02008-10-21 11:01:33 +020072static struct regulatory_request *last_request;
Johannes Berg734366d2008-09-15 10:56:48 +020073
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070074/* To trigger userspace events */
75static struct platform_device *reg_pdev;
Johannes Berg8318d782008-01-24 19:38:38 +010076
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -070077/* Keep the ordering from large to small */
78static u32 supported_bandwidths[] = {
79 MHZ_TO_KHZ(40),
80 MHZ_TO_KHZ(20),
Johannes Berg8318d782008-01-24 19:38:38 +010081};
82
Johannes Berg734366d2008-09-15 10:56:48 +020083/* 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 */
Johannes Berga3d2eaf2008-09-15 11:10:52 +020086static const struct ieee80211_regdomain *cfg80211_regdomain;
Johannes Berg734366d2008-09-15 10:56:48 +020087
88/* We keep a static world regulatory domain in case of the absence of CRDA */
89static 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
Johannes Berga3d2eaf2008-09-15 11:10:52 +020099static const struct ieee80211_regdomain *cfg80211_world_regdom =
100 &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200101
102#ifdef CONFIG_WIRELESS_OLD_REGULATORY
103static char *ieee80211_regdom = "US";
104module_param(ieee80211_regdom, charp, 0444);
105MODULE_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
111static 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
130static 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
146static 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
174static 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
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200186static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200187{
188 if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
189 return true;
190 return false;
191}
Johannes Berg734366d2008-09-15 10:56:48 +0200192#else
Johannes Berg942b25c2008-09-15 11:26:47 +0200193static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
194{
195 return false;
196}
197#endif
198
Johannes Berg734366d2008-09-15 10:56:48 +0200199static void reset_regdomains(void)
200{
Johannes Berg942b25c2008-09-15 11:26:47 +0200201 /* 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);
Johannes Berg734366d2008-09-15 10:56:48 +0200213
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200214 cfg80211_world_regdom = &world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200215 cfg80211_regdomain = NULL;
216}
217
218/* Dynamic world regulatory domain requested by the wireless
219 * core upon initialization */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200220static void update_world_regdomain(const struct ieee80211_regdomain *rd)
Johannes Berg734366d2008-09-15 10:56:48 +0200221{
Johannes Bergf6037d02008-10-21 11:01:33 +0200222 BUG_ON(!last_request);
Johannes Berg734366d2008-09-15 10:56:48 +0200223
224 reset_regdomains();
225
226 cfg80211_world_regdom = rd;
227 cfg80211_regdomain = rd;
228}
Johannes Berg734366d2008-09-15 10:56:48 +0200229
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200230bool is_world_regdom(const char *alpha2)
Johannes Berg8318d782008-01-24 19:38:38 +0100231{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700232 if (!alpha2)
233 return false;
234 if (alpha2[0] == '0' && alpha2[1] == '0')
235 return true;
236 return false;
Johannes Berg8318d782008-01-24 19:38:38 +0100237}
238
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200239static bool is_alpha2_set(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700240{
241 if (!alpha2)
242 return false;
243 if (alpha2[0] != 0 && alpha2[1] != 0)
244 return true;
245 return false;
246}
Johannes Berg8318d782008-01-24 19:38:38 +0100247
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700248static bool is_alpha_upper(char letter)
249{
250 /* ASCII A - Z */
251 if (letter >= 65 && letter <= 90)
252 return true;
253 return false;
254}
255
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200256static bool is_unknown_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700257{
258 if (!alpha2)
259 return false;
260 /* Special case where regulatory domain was built by driver
261 * but a specific alpha2 cannot be determined */
262 if (alpha2[0] == '9' && alpha2[1] == '9')
263 return true;
264 return false;
265}
266
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200267static bool is_an_alpha2(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700268{
269 if (!alpha2)
270 return false;
271 if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
272 return true;
273 return false;
274}
275
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200276static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700277{
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
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200286static bool regdom_changed(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700287{
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. */
297static 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
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700309 printk(KERN_INFO "cfg80211: Calling CRDA to update world "
310 "regulatory domain\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700311
312 country_env[8] = alpha2[0];
313 country_env[9] = alpha2[1];
314
315 return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
316}
317
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700318/* Used by nl80211 before kmalloc'ing our regulatory domain */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200319bool reg_is_valid_request(const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700320{
Johannes Bergf6037d02008-10-21 11:01:33 +0200321 if (!last_request)
322 return false;
323
324 return alpha2_equal(last_request->alpha2, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700325}
326
327/* Sanity check on a regulatory rule */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200328static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700329{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200330 const struct ieee80211_freq_range *freq_range = &rule->freq_range;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700331 u32 freq_diff;
332
Luis R. Rodriguez91e99002008-11-12 14:21:55 -0800333 if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700334 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
Luis R. Rodriguezd71aaf62008-10-30 13:33:52 -0700341 if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700342 return false;
343
344 return true;
345}
346
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200347static bool is_valid_rd(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700348{
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200349 const struct ieee80211_reg_rule *reg_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700350 unsigned int i;
351
352 if (!rd->n_reg_rules)
353 return false;
354
355 for (i = 0; i < rd->n_reg_rules; i++) {
356 reg_rule = &rd->reg_rules[i];
357 if (!is_valid_reg_rule(reg_rule))
358 return false;
359 }
360
361 return true;
362}
363
364/* Returns value in KHz */
365static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
366 u32 freq)
367{
368 unsigned int i;
369 for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
370 u32 start_freq_khz = freq - supported_bandwidths[i]/2;
371 u32 end_freq_khz = freq + supported_bandwidths[i]/2;
372 if (start_freq_khz >= freq_range->start_freq_khz &&
373 end_freq_khz <= freq_range->end_freq_khz)
374 return supported_bandwidths[i];
375 }
376 return 0;
377}
378
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700379/* Helper for regdom_intersect(), this does the real
380 * mathematical intersection fun */
381static int reg_rules_intersect(
382 const struct ieee80211_reg_rule *rule1,
383 const struct ieee80211_reg_rule *rule2,
384 struct ieee80211_reg_rule *intersected_rule)
385{
386 const struct ieee80211_freq_range *freq_range1, *freq_range2;
387 struct ieee80211_freq_range *freq_range;
388 const struct ieee80211_power_rule *power_rule1, *power_rule2;
389 struct ieee80211_power_rule *power_rule;
390 u32 freq_diff;
391
392 freq_range1 = &rule1->freq_range;
393 freq_range2 = &rule2->freq_range;
394 freq_range = &intersected_rule->freq_range;
395
396 power_rule1 = &rule1->power_rule;
397 power_rule2 = &rule2->power_rule;
398 power_rule = &intersected_rule->power_rule;
399
400 freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
401 freq_range2->start_freq_khz);
402 freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
403 freq_range2->end_freq_khz);
404 freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
405 freq_range2->max_bandwidth_khz);
406
407 freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
408 if (freq_range->max_bandwidth_khz > freq_diff)
409 freq_range->max_bandwidth_khz = freq_diff;
410
411 power_rule->max_eirp = min(power_rule1->max_eirp,
412 power_rule2->max_eirp);
413 power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
414 power_rule2->max_antenna_gain);
415
416 intersected_rule->flags = (rule1->flags | rule2->flags);
417
418 if (!is_valid_reg_rule(intersected_rule))
419 return -EINVAL;
420
421 return 0;
422}
423
424/**
425 * regdom_intersect - do the intersection between two regulatory domains
426 * @rd1: first regulatory domain
427 * @rd2: second regulatory domain
428 *
429 * Use this function to get the intersection between two regulatory domains.
430 * Once completed we will mark the alpha2 for the rd as intersected, "98",
431 * as no one single alpha2 can represent this regulatory domain.
432 *
433 * Returns a pointer to the regulatory domain structure which will hold the
434 * resulting intersection of rules between rd1 and rd2. We will
435 * kzalloc() this structure for you.
436 */
437static struct ieee80211_regdomain *regdom_intersect(
438 const struct ieee80211_regdomain *rd1,
439 const struct ieee80211_regdomain *rd2)
440{
441 int r, size_of_regd;
442 unsigned int x, y;
443 unsigned int num_rules = 0, rule_idx = 0;
444 const struct ieee80211_reg_rule *rule1, *rule2;
445 struct ieee80211_reg_rule *intersected_rule;
446 struct ieee80211_regdomain *rd;
447 /* This is just a dummy holder to help us count */
448 struct ieee80211_reg_rule irule;
449
450 /* Uses the stack temporarily for counter arithmetic */
451 intersected_rule = &irule;
452
453 memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
454
455 if (!rd1 || !rd2)
456 return NULL;
457
458 /* First we get a count of the rules we'll need, then we actually
459 * build them. This is to so we can malloc() and free() a
460 * regdomain once. The reason we use reg_rules_intersect() here
461 * is it will return -EINVAL if the rule computed makes no sense.
462 * All rules that do check out OK are valid. */
463
464 for (x = 0; x < rd1->n_reg_rules; x++) {
465 rule1 = &rd1->reg_rules[x];
466 for (y = 0; y < rd2->n_reg_rules; y++) {
467 rule2 = &rd2->reg_rules[y];
468 if (!reg_rules_intersect(rule1, rule2,
469 intersected_rule))
470 num_rules++;
471 memset(intersected_rule, 0,
472 sizeof(struct ieee80211_reg_rule));
473 }
474 }
475
476 if (!num_rules)
477 return NULL;
478
479 size_of_regd = sizeof(struct ieee80211_regdomain) +
480 ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
481
482 rd = kzalloc(size_of_regd, GFP_KERNEL);
483 if (!rd)
484 return NULL;
485
486 for (x = 0; x < rd1->n_reg_rules; x++) {
487 rule1 = &rd1->reg_rules[x];
488 for (y = 0; y < rd2->n_reg_rules; y++) {
489 rule2 = &rd2->reg_rules[y];
490 /* This time around instead of using the stack lets
491 * write to the target rule directly saving ourselves
492 * a memcpy() */
493 intersected_rule = &rd->reg_rules[rule_idx];
494 r = reg_rules_intersect(rule1, rule2,
495 intersected_rule);
496 /* No need to memset here the intersected rule here as
497 * we're not using the stack anymore */
498 if (r)
499 continue;
500 rule_idx++;
501 }
502 }
503
504 if (rule_idx != num_rules) {
505 kfree(rd);
506 return NULL;
507 }
508
509 rd->n_reg_rules = num_rules;
510 rd->alpha2[0] = '9';
511 rd->alpha2[1] = '8';
512
513 return rd;
514}
515
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700516/* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
517 * want to just have the channel structure use these */
518static u32 map_regdom_flags(u32 rd_flags)
519{
520 u32 channel_flags = 0;
521 if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
522 channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
523 if (rd_flags & NL80211_RRF_NO_IBSS)
524 channel_flags |= IEEE80211_CHAN_NO_IBSS;
525 if (rd_flags & NL80211_RRF_DFS)
526 channel_flags |= IEEE80211_CHAN_RADAR;
527 return channel_flags;
528}
529
530/**
531 * freq_reg_info - get regulatory information for the given frequency
532 * @center_freq: Frequency in KHz for which we want regulatory information for
533 * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one
534 * you can set this to 0. If this frequency is allowed we then set
535 * this value to the maximum allowed bandwidth.
536 * @reg_rule: the regulatory rule which we have for this frequency
537 *
538 * Use this function to get the regulatory rule for a specific frequency.
539 */
540static int freq_reg_info(u32 center_freq, u32 *bandwidth,
541 const struct ieee80211_reg_rule **reg_rule)
Johannes Berg8318d782008-01-24 19:38:38 +0100542{
543 int i;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700544 u32 max_bandwidth = 0;
Johannes Berg8318d782008-01-24 19:38:38 +0100545
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700546 if (!cfg80211_regdomain)
547 return -EINVAL;
548
549 for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) {
550 const struct ieee80211_reg_rule *rr;
551 const struct ieee80211_freq_range *fr = NULL;
552 const struct ieee80211_power_rule *pr = NULL;
553
554 rr = &cfg80211_regdomain->reg_rules[i];
555 fr = &rr->freq_range;
556 pr = &rr->power_rule;
557 max_bandwidth = freq_max_bandwidth(fr, center_freq);
558 if (max_bandwidth && *bandwidth <= max_bandwidth) {
559 *reg_rule = rr;
560 *bandwidth = max_bandwidth;
Johannes Berg8318d782008-01-24 19:38:38 +0100561 break;
562 }
563 }
564
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700565 return !max_bandwidth;
566}
567
568static void handle_channel(struct ieee80211_channel *chan)
569{
570 int r;
571 u32 flags = chan->orig_flags;
572 u32 max_bandwidth = 0;
573 const struct ieee80211_reg_rule *reg_rule = NULL;
574 const struct ieee80211_power_rule *power_rule = NULL;
575
576 r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq),
577 &max_bandwidth, &reg_rule);
578
579 if (r) {
Johannes Berg8318d782008-01-24 19:38:38 +0100580 flags |= IEEE80211_CHAN_DISABLED;
581 chan->flags = flags;
582 return;
583 }
584
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700585 power_rule = &reg_rule->power_rule;
586
587 chan->flags = flags | map_regdom_flags(reg_rule->flags);
Johannes Berg8318d782008-01-24 19:38:38 +0100588 chan->max_antenna_gain = min(chan->orig_mag,
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700589 (int) MBI_TO_DBI(power_rule->max_antenna_gain));
590 chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
John W. Linville253898c2008-04-03 15:32:54 -0400591 if (chan->orig_mpwr)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700592 chan->max_power = min(chan->orig_mpwr,
593 (int) MBM_TO_DBM(power_rule->max_eirp));
John W. Linville253898c2008-04-03 15:32:54 -0400594 else
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700595 chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
Johannes Berg8318d782008-01-24 19:38:38 +0100596}
597
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700598static void handle_band(struct ieee80211_supported_band *sband)
Johannes Berg8318d782008-01-24 19:38:38 +0100599{
600 int i;
601
602 for (i = 0; i < sband->n_channels; i++)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700603 handle_channel(&sband->channels[i]);
Johannes Berg8318d782008-01-24 19:38:38 +0100604}
605
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700606static void update_all_wiphy_regulatory(enum reg_set_by setby)
607{
608 struct cfg80211_registered_device *drv;
609
610 list_for_each_entry(drv, &cfg80211_drv_list, list)
611 wiphy_update_regulatory(&drv->wiphy, setby);
612}
613
614void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
Johannes Berg8318d782008-01-24 19:38:38 +0100615{
616 enum ieee80211_band band;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700617 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
Johannes Berg8318d782008-01-24 19:38:38 +0100618 if (wiphy->bands[band])
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700619 handle_band(wiphy->bands[band]);
620 if (wiphy->reg_notifier)
621 wiphy->reg_notifier(wiphy, setby);
622 }
623}
624
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700625/* Return value which can be used by ignore_request() to indicate
626 * it has been determined we should intersect two regulatory domains */
627#define REG_INTERSECT 1
628
Johannes Berg84fa4f42008-10-24 20:32:23 +0200629/* This has the logic which determines when a new request
630 * should be ignored. */
631static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
632 const char *alpha2)
633{
634 /* All initial requests are respected */
635 if (!last_request)
636 return 0;
637
638 switch (set_by) {
639 case REGDOM_SET_BY_INIT:
640 return -EINVAL;
641 case REGDOM_SET_BY_CORE:
642 /*
643 * Always respect new wireless core hints, should only happen
644 * when updating the world regulatory domain at init.
645 */
646 return 0;
647 case REGDOM_SET_BY_COUNTRY_IE:
648 if (unlikely(!is_an_alpha2(alpha2)))
649 return -EINVAL;
650 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
651 if (last_request->wiphy != wiphy) {
652 /*
653 * Two cards with two APs claiming different
654 * different Country IE alpha2s. We could
655 * intersect them, but that seems unlikely
656 * to be correct. Reject second one for now.
657 */
658 if (!alpha2_equal(alpha2,
659 cfg80211_regdomain->alpha2))
660 return -EOPNOTSUPP;
661 return -EALREADY;
662 }
663 /* Two consecutive Country IE hints on the same wiphy */
664 if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
665 return 0;
666 return -EALREADY;
667 }
668 /*
669 * Ignore Country IE hints for now, need to think about
670 * what we need to do to support multi-domain operation.
671 */
672 return -EOPNOTSUPP;
673 case REGDOM_SET_BY_DRIVER:
674 if (last_request->initiator == REGDOM_SET_BY_DRIVER)
675 return -EALREADY;
676 return 0;
677 case REGDOM_SET_BY_USER:
Johannes Berg84fa4f42008-10-24 20:32:23 +0200678 if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700679 return REG_INTERSECT;
Johannes Berg84fa4f42008-10-24 20:32:23 +0200680 return 0;
681 }
682
683 return -EINVAL;
684}
685
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700686/* Caller must hold &cfg80211_drv_mutex */
687int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
Johannes Bergbe3d4812008-10-24 20:32:21 +0200688 const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700689{
690 struct regulatory_request *request;
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700691 bool intersect = false;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700692 int r = 0;
693
Johannes Bergbe3d4812008-10-24 20:32:21 +0200694 r = ignore_request(wiphy, set_by, alpha2);
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700695
696 if (r == REG_INTERSECT)
697 intersect = true;
698 else if (r)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700699 return r;
700
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -0800701 request = kzalloc(sizeof(struct regulatory_request),
702 GFP_KERNEL);
703 if (!request)
704 return -ENOMEM;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700705
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -0800706 request->alpha2[0] = alpha2[0];
707 request->alpha2[1] = alpha2[1];
708 request->initiator = set_by;
709 request->wiphy = wiphy;
710 request->intersect = intersect;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700711
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -0800712 kfree(last_request);
713 last_request = request;
714 r = call_crda(alpha2);
715
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700716#ifndef CONFIG_WIRELESS_OLD_REGULATORY
Luis R. Rodriguez5203cdb2008-11-12 14:21:56 -0800717 if (r)
718 printk(KERN_ERR "cfg80211: Failed calling CRDA\n");
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700719#endif
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700720
721 return r;
722}
723
Johannes Bergbe3d4812008-10-24 20:32:21 +0200724void regulatory_hint(struct wiphy *wiphy, const char *alpha2)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700725{
Johannes Bergbe3d4812008-10-24 20:32:21 +0200726 BUG_ON(!alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700727
728 mutex_lock(&cfg80211_drv_mutex);
Johannes Bergbe3d4812008-10-24 20:32:21 +0200729 __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700730 mutex_unlock(&cfg80211_drv_mutex);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700731}
732EXPORT_SYMBOL(regulatory_hint);
733
734
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200735static void print_rd_rules(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700736{
737 unsigned int i;
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200738 const struct ieee80211_reg_rule *reg_rule = NULL;
739 const struct ieee80211_freq_range *freq_range = NULL;
740 const struct ieee80211_power_rule *power_rule = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700741
742 printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
743 "(max_antenna_gain, max_eirp)\n");
744
745 for (i = 0; i < rd->n_reg_rules; i++) {
746 reg_rule = &rd->reg_rules[i];
747 freq_range = &reg_rule->freq_range;
748 power_rule = &reg_rule->power_rule;
749
750 /* There may not be documentation for max antenna gain
751 * in certain regions */
752 if (power_rule->max_antenna_gain)
753 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
754 "(%d mBi, %d mBm)\n",
755 freq_range->start_freq_khz,
756 freq_range->end_freq_khz,
757 freq_range->max_bandwidth_khz,
758 power_rule->max_antenna_gain,
759 power_rule->max_eirp);
760 else
761 printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
762 "(N/A, %d mBm)\n",
763 freq_range->start_freq_khz,
764 freq_range->end_freq_khz,
765 freq_range->max_bandwidth_khz,
766 power_rule->max_eirp);
767 }
768}
769
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200770static void print_regdomain(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700771{
772
773 if (is_world_regdom(rd->alpha2))
774 printk(KERN_INFO "cfg80211: World regulatory "
775 "domain updated:\n");
776 else {
777 if (is_unknown_alpha2(rd->alpha2))
778 printk(KERN_INFO "cfg80211: Regulatory domain "
779 "changed to driver built-in settings "
780 "(unknown country)\n");
781 else
782 printk(KERN_INFO "cfg80211: Regulatory domain "
783 "changed to country: %c%c\n",
784 rd->alpha2[0], rd->alpha2[1]);
785 }
786 print_rd_rules(rd);
787}
788
Johannes Berg2df78162008-10-28 16:49:41 +0100789static void print_regdomain_info(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700790{
791 printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
792 rd->alpha2[0], rd->alpha2[1]);
793 print_rd_rules(rd);
794}
795
Johannes Bergd2372b32008-10-24 20:32:20 +0200796/* Takes ownership of rd only if it doesn't fail */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200797static int __set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700798{
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700799 const struct ieee80211_regdomain *intersected_rd = NULL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700800 /* Some basic sanity checks first */
801
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700802 if (is_world_regdom(rd->alpha2)) {
Johannes Bergf6037d02008-10-21 11:01:33 +0200803 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700804 return -EINVAL;
805 update_world_regdomain(rd);
806 return 0;
807 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700808
809 if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
810 !is_unknown_alpha2(rd->alpha2))
811 return -EINVAL;
812
Johannes Bergf6037d02008-10-21 11:01:33 +0200813 if (!last_request)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700814 return -EINVAL;
815
Johannes Berg942b25c2008-09-15 11:26:47 +0200816 /* allow overriding the static definitions if CRDA is present */
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700817 if (!is_old_static_regdom(cfg80211_regdomain) &&
Johannes Berg942b25c2008-09-15 11:26:47 +0200818 !regdom_changed(rd->alpha2))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700819 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700820
821 /* Now lets set the regulatory domain, update all driver channels
822 * and finally inform them of what we have done, in case they want
823 * to review or adjust their own settings based on their own
824 * internal EEPROM data */
825
Johannes Bergf6037d02008-10-21 11:01:33 +0200826 if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700827 return -EINVAL;
828
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700829 reset_regdomains();
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700830
831 /* Country IE parsing coming soon */
Luis R. Rodriguez8375af32008-11-12 14:21:57 -0800832
833 if (!is_valid_rd(rd)) {
834 printk(KERN_ERR "cfg80211: Invalid "
835 "regulatory domain detected:\n");
836 print_regdomain_info(rd);
837 return -EINVAL;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700838 }
839
Luis R. Rodriguez9c964772008-10-30 13:33:53 -0700840 if (unlikely(last_request->intersect)) {
841 intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
842 if (!intersected_rd)
843 return -EINVAL;
844 kfree(rd);
845 rd = intersected_rd;
846 }
847
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700848 /* Tada! */
849 cfg80211_regdomain = rd;
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700850
851 return 0;
852}
853
854
855/* Use this call to set the current regulatory domain. Conflicts with
856 * multiple drivers can be ironed out later. Caller must've already
Johannes Bergd2372b32008-10-24 20:32:20 +0200857 * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200858int set_regdom(const struct ieee80211_regdomain *rd)
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700859{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700860 int r;
861
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700862 /* Note that this doesn't update the wiphys, this is done below */
863 r = __set_regdom(rd);
Johannes Bergd2372b32008-10-24 20:32:20 +0200864 if (r) {
865 kfree(rd);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700866 return r;
Johannes Bergd2372b32008-10-24 20:32:20 +0200867 }
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700868
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700869 /* This would make this whole thing pointless */
870 BUG_ON(rd != cfg80211_regdomain);
871
872 /* update all wiphys now with the new established regulatory domain */
Johannes Bergf6037d02008-10-21 11:01:33 +0200873 update_all_wiphy_regulatory(last_request->initiator);
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700874
875 print_regdomain(rd);
876
877 return r;
878}
879
880int regulatory_init(void)
881{
Johannes Berg734366d2008-09-15 10:56:48 +0200882 int err;
883
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700884 reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
885 if (IS_ERR(reg_pdev))
886 return PTR_ERR(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +0200887
888#ifdef CONFIG_WIRELESS_OLD_REGULATORY
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200889 cfg80211_regdomain = static_regdom(ieee80211_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200890
Johannes Berg942b25c2008-09-15 11:26:47 +0200891 printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
Johannes Berg734366d2008-09-15 10:56:48 +0200892 print_regdomain_info(cfg80211_regdomain);
893 /* The old code still requests for a new regdomain and if
894 * you have CRDA you get it updated, otherwise you get
895 * stuck with the static values. We ignore "EU" code as
896 * that is not a valid ISO / IEC 3166 alpha2 */
Johannes Bergac9440a2008-10-21 11:08:27 +0200897 if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
Johannes Berg734366d2008-09-15 10:56:48 +0200898 err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE,
Johannes Bergbe3d4812008-10-24 20:32:21 +0200899 ieee80211_regdom);
Johannes Berg734366d2008-09-15 10:56:48 +0200900#else
Johannes Berga3d2eaf2008-09-15 11:10:52 +0200901 cfg80211_regdomain = cfg80211_world_regdom;
Johannes Berg734366d2008-09-15 10:56:48 +0200902
Johannes Bergbe3d4812008-10-24 20:32:21 +0200903 err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00");
Johannes Berg734366d2008-09-15 10:56:48 +0200904 if (err)
905 printk(KERN_ERR "cfg80211: calling CRDA failed - "
906 "unable to update world regulatory domain, "
907 "using static definition\n");
908#endif
909
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700910 return 0;
911}
912
913void regulatory_exit(void)
914{
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700915 mutex_lock(&cfg80211_drv_mutex);
Johannes Berg734366d2008-09-15 10:56:48 +0200916
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700917 reset_regdomains();
Johannes Berg734366d2008-09-15 10:56:48 +0200918
Johannes Bergf6037d02008-10-21 11:01:33 +0200919 kfree(last_request);
920
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700921 platform_device_unregister(reg_pdev);
Johannes Berg734366d2008-09-15 10:56:48 +0200922
Luis R. Rodriguezb2e1b302008-09-09 23:19:48 -0700923 mutex_unlock(&cfg80211_drv_mutex);
Johannes Berg8318d782008-01-24 19:38:38 +0100924}